Claws for climbing poles and trees

Features and types

So, earlier in the article we already said that these attributes of an electrician are classified according to their purpose and the material from which the support is made. Let's take a closer look at the types of monter claws.

For lifting on a wooden support

The production and operating rules of this type are provided for and controlled by GOST 14331 - 77 “Fitter claws for wooden and wooden supports with reinforced concrete stepsons. Technical conditions". According to this regulatory document, there are three types of devices for lifting onto a wooden support.

• KM – 1. Can be used on a support whose diameter is from 14 to 24.5 cm, the claw gap is from 24.5 cm to 1 cm.
• KM – 2. For a support column, the diameter of which is from 22 to 31.5 cm, the opening of the claws is from 31.5 cm to 1 cm.
• KM – 3 Can be used on a support with a diameter of 31 to 41.5 cm, claw opening from 41.5 cm to 1 cm.

Manholes of the KM type are characterized by a stamped platform and the presence of special ears with which the arches are attached. Thanks to the latter, the leg is securely fixed and does not slip on the platform. The back surface is equipped with stiffening ribs. The spikes are made of high-strength steel and hardened.

Their condition must be constantly monitored and, if necessary, replaced immediately. Such claws can withstand loads from 140 to 160 kg. The design belts are wear-resistant and made of leather.

For climbing on reinforced concrete supports

Like the previous type, they are manufactured in accordance with legislative regulations. The products are marked as follows.

• LMC. Used for lifting onto a reinforced concrete centrifuged support. Can be used at temperatures from -20ºС to +30 ºС. The maximum permissible load per manhole is 180 kg. Functional, wear-resistant, made of quality materials. They can be used for lifting onto a support, the diameter of which is from 12.6 cm to 15 cm, the throat of the claw is from 13.6 cm to 1.5 cm.
• LU. LU type claws are universal. They are characterized by the presence of an additional belt that secures the back of the electrician’s foot. Suitable for supports with diameters from 16.8 cm to 19 cm.
• KLM. There are two types of claws of the KLM type - KLM - 1 and KLM - 2. Their rise is the same - 16.5 cm, but the pharynx is different. Claws KLM – 1 are characterized by a throat from 16.8 cm to 0.5 cm, and KLM – 2 have a throat from 19 cm to 0.5 cm.

Rating of the 12 best holes and claws for 2022

Equipment operating conditions

The installation kit is allowed for use only if:

1. Compliance with GOST or TU
2. Availability of manufacturer's logo
3. Availability of a passport for the product, which must indicate the serial number, technical characteristics, date of manufacture, purpose
4. The presence of a mark on the test results, date, static load value.

A professional electrician must have specialized training, and when performing a task he must take into account: the degree of serviceability of the elements, the condition of the spikes, the seams of the clamps, the serviceability of the fasteners, the presence of nut locks, cotter pins.

The rules for working at height provide for maintaining the serviceability of all elements of the assembly claws. It is recommended that the specialist store his equipment in places inaccessible to unauthorized persons, as well as excluding physical impact, which will result in deformation, chipping, cracking, tearing, or the formation of sharp edges on parts that can be detected by hand or visual diagnostics.

The fitter's set of equipment provides the specialist with the safety of high-altitude work, provided that the welding seams between the elements are reliable, the elements of the step and replacement plates are properly fixed, the height of the thread ridges of the studs, and the lock nut.

Terms of use

There are special instructions for electricians that tell you how to use electrician's claws. First of all, it is necessary to take certain safety measures when performing various works in electrical networks, especially on power lines.

1. Before starting work, you need to agree on the procedure, draw up all the necessary documents, prepare the workplace and allow workers to complete the task. These measures are extremely important and necessary in order to protect workers. For example, when an electrician is working, voltage may be applied to live parts (namely wires).
2. You need to be able to properly use the protective insulating equipment used during work.
3. Installer's claws are used exclusively for those supports that are indicated in the device's passport.
4. Before starting work, you need to check the product for damage and check the test date. In this case, yarns and belts, bolted connections, welds, fasteners, and spikes are checked. Electricians who use assembly claws must undergo additional instruction and training. They are also tested on their knowledge and checked whether they have a record of permission to carry out the work independently.
5. Twice a year, claws and holes should be sent for inspection. This is necessary in order to detect and correct a defect or malfunction in a timely manner.
6. If the integrity of the device is compromised (for example, there is a crack or a hangnail), then they are not allowed to be used.
7. In addition to the structure itself, before carrying out work, you need to separately check the safety belt and climb the pole only with it.
8. It is prohibited to change anything in the structure of the device or its belts.
9. It is strictly forbidden to climb a pole through which fault currents passed to the ground.
10. The structure must be stable and integral.

The video below clearly demonstrates how to use lineman's claws when climbing onto a support:

Changing the heater

Here is one of the methods that allows you to change the heating element on an Ariston automatic washing machine with your own hands. Heater malfunction can manifest itself in two ways: an open circuit or current leakage into the housing. In both cases, it is necessary to replace the faulty module with a new, working one.

To change the heating element, you need to have free access to the rear wall of the case. In the base of the washing machine you can see a small plug. Unscrew the mounting screws and remove the wall covering the hole in the housing. Through the window that opens, you will have access to the heating element, which is located on the top, on the right.

Using your smartphone camera, record how all the wiring should be connected correctly. On the side you can see the power contacts - zero and phase, colored red and blue, respectively. There is a housing contact in the center; this cable has a yellow-green tint

Please note that next to the housing contact and the power wire there is a temperature sensor, which is a plastic connector equipped with a special latch. All wiring going to the heater must be carefully disconnected

The nut located in the center of the heating element must be loosened. She pulls on an elastic band designed to completely seal the connection. There is no need to completely tighten the nut, just loosen it and press it inward along with the tension bolt. These actions will weaken the seal and make it possible to remove the heater from the washer.

When you take out the heating element, you will probably see a white limescale deposit on it. It is this layer that disrupts heat transfer, resulting in overheating of the part and breaking the circuit. When replacing the heater, the temperature measurement sensor is removed from the non-working element and attached to a new one.

To make the installation of the new heating element easy and smooth, lubricate its gasket with liquid laundry detergent. When further installing a working part, be sure to check that the edge of the element is connected to the fastener located in the tank. To do this, insert the heating element into the tank and press it firmly until it completely enters the hole in the tank. Then secure the structure by tightening the tension nut. Connect all existing wires and contacts according to the previous diagram.

Before installing the plug cover, check the heater for leaks - fill the tank with water without starting the wash. If it turns out that the connection is leaking liquid or air, tighten the tension nut more tightly. Once the functionality of the washing machine has been confirmed, assemble the Ariston machine completely.

Varieties

Claw models differ in the diameter of the post for which they are designed. Types of claws.

• Type KM-1. Pole diameter 140 - 245 mm. The maximum distance between the spines in the claws is 245 ± 10 mm.
• Type KM-2. Pole diameter 220 - 315 mm. The maximum distance between the spines in the claws is 315 ± 10 mm.
• Type KM-3. Pole diameter 310 - 415 mm. The maximum distance between the spines in the claws is 415 ± 10 mm.

Fitter's claws for steel poles - KMM. Combined manhole claws for concrete supports - KLM. Universal manholes - LU. Such products are designed for operation in the temperature range from -40 to +50C.

• Type KMM, fitter claws, pole diameter 126 - 150 mm. The maximum distance between the spines in the claws is 136 ± 15 mm.
• LU type, assembly manholes, column diameter 168 - 190 mm. There are models of universal manholes with varying distances between the tenons.
• Type KLM-1, combined claws and manholes. Maximum distance between pins 168 ± 5 mm.
• Type KLM-2, combined claws and manholes. Maximum distance between pins 190 ± 5 mm.

Design

Claws and pole holes have a similar design.

• Leather straps for fixing the fitter’s foot on the support.
• Support or platform for feet.
• Spikes for reliable fixation of the device at height. The spikes are attached to a threaded connection and are replaced as they wear out. Tenons designed for wooden posts differ from tenons for concrete.
• Metal arcs wrapping around a pole. The claws are oval, the holes are rectangular.

The foot platform is stamped, with holes to reduce the weight of the product. On the back side there are stiffening ribs that prevent the platform from bending. Along the perimeter of the platform there are low sides that reduce foot slipping during work.

Spikes wear out the fastest in holes or claws. It is the spikes and fastening straps that must be monitored when using these devices. The spikes are installed on the front (3 spikes) and rear (2 spikes) parts of the arc.

According to GOST, belts must be leather, impregnated with animal fat. Stitched with nylon threads. The mounting structure is designed for 140 - 160 kg.

Features of use

Laps and claws are simple devices, but they are used in dangerous conditions: high altitude, presence of live wires nearby. Therefore, these devices must be operated in compliance with safety regulations.

• Use claws and manholes only for supports made of suitable material.
• Twice a year, claws and holes are checked.
• Before putting on the devices, check the condition of the cleats and straps.
• Climb the pole only with a safety belt.

Prevention and maintenance of claws and manholes for high-altitude work

Claws and manholes do not require complex maintenance. After use, they are cleaned of dirt and stored in a dry place. Requirements for using protective equipment at height.

• Claws and manholes must withstand a static load of 180 kgf without deformation.
• The service life of claws and manholes (without spikes and belts) is set by the manufacturer, but not more than 5 years.
• You cannot use manholes and claws on supports covered with ice, at temperatures below the permissible ones - in this case, the steel becomes brittle and there is a high probability of product breakage.

What other means of protection are needed?

In addition to the claws are used.

• Mounting belt with a wide or narrow sash. A sling made of chain or steel cable is attached to the belt.
• A helmet to protect the head from contact with support elements or wires.
• Protective gloves depending on the work performed. Installation work - leather is suitable, electrical installation - dielectric rubber.
• Signal vests.

Our store sells claws and manholes starting at 4,800 rubles. Electrician's belts with fastening to the belt, belt and shoulders, belt, shoulders and hips. Cost from 500 rubles.

You can increase the safety of installers and electricians by using safety vests. We sell signal vests of protection classes 2 and 3. It is possible to apply a logo.

Find out more about the terms of payment and delivery of mounting manholes and claws1 seven days a week from 9 a.m. to 6 p.m. Moscow time.

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Structure of assembly manholes

Regardless of the function, the structure has a general appearance:

• Hook for clinging to a support.
• Spikes for better fastening to the support.
• Foot rest.
• Leather straps to secure your feet to the footrest.

The hook is the most important part of the manhole; it bears the main load. It is made of pipes of the required diameter and, depending on the purpose, can have the shape of a trapezoid, rectangle or oval. Spikes are attached to the hook for greater stability.

The footrest consists of a metal plate with slots. The feet are secured to the footrest with thick leather straps with clamps.

Installer's claws for working on wooden supports

The design capabilities of assembler's claws for wooden supports, commercially produced in accordance with GOST 14331-77, are presented below:

• Type KM-1 – recommended support diameter 140...245 mm, throat 245±10 mm;
• Type KM-2 – recommended support diameter 220...315 mm, throat 315±10 mm;
• Type KM-3 - recommended support diameter 310...415 mm, throat 415±10 mm.

The platform of the KM series claws is stamped, with perforated holes, which makes it possible to increase the reliability of contact of the foot with the surface, while simultaneously reducing the weight of the platform. After stamping, the platform is hardened to a hardness of HRC 38...42. On one of the side surfaces of each platform there are ears for attaching steel arches. Along the remaining edges of the platform there are low sides, the presence of which prevents the electrician’s foot from accidentally slipping. To strengthen it during manufacturing, stiffening ribs are formed on the rear surface of the platform.

The fixing part of the arc rotates freely in the ears, ensuring the fixation of the spikes along the support at the moment of lifting the electric line operator. The permissible play should be no higher than ±15º.

The quick-wearing part of repairman's claws are the spikes, despite the fact that their initial hardness after hardening is 45...50 HRC. For claws on wooden supports, spikes are always made with conical tips. Experiencing significant frictional stress, steel spikes become dull and deformed over time. The durability of carbide studs is much higher, but they are sensitive to impacts and bending loads. Replacing the studs is not difficult, since their fastening part is threaded. The rear part of the platform is also equipped with spikes of a similar design.

The leg of the working person is attached to the arch of the claw using straps. In order to ensure elasticity, their upper part is made of yuft, and the lower part is made of rawhide impregnated with animal fat. The stitching of the belt elements is carried out with nylon threads, and the thickness of the belt and the diameter of the threads are calculated for a load of at least 140...160 kg.

Claws for climbing poles

The operation of power lines, like any other equipment, is impossible without damage or malfunctions that occur at the most inopportune moment. In order to eliminate them in a timely and efficient manner, it is necessary to have suitable tools and devices available.

To eliminate malfunctions in the operation of power lines, there are special tools, and even equipment that can be used to quickly get to the location of the breakdown. Such equipment is monter's claws (cat's claws, monter's manholes), which help you easily climb up the pole.

This type of equipment is an integral part of specialized equipment for performing work related to power lines, so they must be in the arsenal of any enterprise related to the maintenance and repair of power lines.

Brief contents of the article:

Purpose

The main purpose of the claws is considered to be quick and convenient climbing up the pole in order to perform planned or unforeseen work.

The design of the claws is simple: the main element of the device is two hooks with straps attached to them, with which they are directly attached to the legs (each separately).

The device is made from durable and reliable metal, which guarantees safety when working at heights.

The diameter of the hook is slightly larger than the parameters of the circle post. To conveniently and correctly climb up or down, you need to install the hook perpendicular to the vertical pole. Otherwise, the worker will not be able to move up or down. How difficult is it to climb a pole without claws?

Materials used

Wooden poles for power lines have been replaced by reinforced concrete poles that are more durable and resistant to use.

The most commonly used claw material is high-strength steel, coated with an anti-corrosion protective layer for greater durability.

The structure of the belts is multi-layered; yuft and rawhide are used as the main material for their production; in addition, in the end they are also stitched with nylon threads for greater reliability.

Varieties and properties

To perform the work efficiently and efficiently, it is necessary to use suitable equipment and tools. To move along a wooden pole, you should select the appropriate claws, for concrete ones - similarly.

Today, claws used for climbing poles are classified into:

• linemen, which are used to move along round metal or wooden poles, but they are now practically not used.
• assembly manholes for concrete supports, designed for movement on pillars with a round or trapezoidal cross-section. It is considered the most popular type of claw.

assembly manholes for climbing reinforced concrete supports with a trapezoidal cross-section in diameter. Plus, they can be customized and used for any type of power pole.

Auxiliary elements

Any specialist servicing power lines must have a full arsenal of tools and devices to perform the work. It must include: a protective helmet and a safety lanyard.

Selection rules

To make the right choice of claws, you need to have some knowledge in this area

When choosing a device, you should pay attention to the following nuances:. Product price

In this case, it is worth remembering that cheaper versions of the claws may use insufficiently high-quality metal, as a result of which the device will be unreliable and dangerous. Focus on medium or high price, which guarantees quality.

Product price. In this case, it is worth remembering that cheaper versions of the claws may use insufficiently high-quality metal, as a result of which the device will be unreliable and dangerous. Focus on medium or high price, which guarantees quality.

Manufacturer. As you know, it is better to trust proven and well-known manufacturers.

Maintenance and operation

Conditions of maintenance and operation are simple. Post claws are suitable for use in all temperature zones. The safe use period is indicated on the label. During their use, it is necessary to carry out preventive inspections and, if necessary, change components. Clean your claws regularly.

Storage conditions

It is recommended to store claws in a dry, well-ventilated area at a temperature of -20 to +30 degrees.

If damage to the claws is detected, you should stop using them, have them repaired by a specialist, or replace them with new ones.

Proper storage conditions

After each use, the claws must be cleaned of dirt, rust, concrete dust or crumbs.

Claws for climbing poles should be stored suspended (on hooks or special hangers), in well-ventilated, dry areas out of the reach of children and pets.

Another advantage of such equipment for installers and electricians is the possibility of making it yourself - on the Internet you can easily find both a visual drawing and video instructions for assembling claws from scrap materials with your own hands.

Types of claws

Monter's claws come in various designs. This depends on the types of power line towers. They differ in section type and shape. Reinforced concrete pillars come in round, rectangular, cylindrical, trapezoidal, polygonal and conical shapes. Round-shaped wooden supports are also found. So what types of devices are there? There are only 2 of them (main ones):

1. Crescent (KM-1, KM-2 and others). They are used when climbing wooden poles, even those with reinforced concrete attachments. This design is not adjustable, since the sickle with which the worker clings to the structure has a fixed standard size.
2. Manholes (universal – LU-1 and others). They differ from the previous ones in scope and design. The element with which the worker clings to the support is called a manhole. It is bent at a right angle. Used for climbing reinforced concrete pillars with a trapezoidal and rectangular cross-section. A distinctive feature is that such installation claws can be adjusted and selected to fit any size of reinforced concrete column.

This product is used for lifting power lines with voltages of 0.4/6/10/35 kV onto poles. There are also improved models that are used when lifting power lines from 110 kV to a support.

Design and principle of operation

The simplest manholes for concrete supports consist of 2 elements for attaching to shoes, each of which consists of the following main components:

• Oval foot support with transverse reinforcements;
• 2 straps holding the foot on the platform;
• “Sickle” is a rectangular grip with 4 conical spikes attached at an angle of approximately 600 to the supporting platform.

Climbing onto a reinforced concrete pole using a similar device occurs as follows:

• The electrician securely fixes the manholes on his shoes using belts;
• Approaching the pillar, he grabs it with the grips of each of the elements of the claws;
• The electrician climbs the pole, thanks to the fact that the claw grips, which he alternately rearranges in the vertical plane, located at an angle to the supporting platforms, bite into the concrete with their spikes and prevent slipping.

Using a similar principle, electrical claws designed for this type of support help you climb onto a wooden pole. Their only differences from the crampons used for concrete pillars are the semicircular shape of the grips and softer spikes.

CATS

CATS

CATCHES FOR WOODEN POSTS PDS

CATS FOR

PU CONCRETE PILLARS

CAPTIVES FOR CONCRETE PILLARS Pm, Pv, Pn

CAPTIVES FOR CONCRETE PILLARS PB

HISTORY OF THE ENTERPRISE

The enterprise was founded in 1978 as an independent working organization – Metal Products Factory “BE-VE”...

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LOCATION

We are located in the western part of Serbia in the town of Bajina Basta, on the border with the Republika Srpska. Bajina Basta is located on …

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Design versions

The type of claws depends on the material of the support on which the electrician will climb, the diameter of the support and the mouth of the claws in their open position. All standard sizes are standardized in accordance with GOST 14331-77, TU34-09-10147-88, and TU 34-2412-77.

Installer's claws for lifting onto ordinary wooden supports, or supports with reinforced concrete attachments, include the following elements:

1. Steel arches, the configuration of which can be in the form of a semicircle (for round supports) or an oval rectangle (for rectangular supports).
2. Removable spikes with tips of various shapes.
3. Platforms for the feet of the worker.
4. Double-layer leather straps that secure the foot.

Structurally close to these products are the so-called fitter manholes. They are designed for lifting an electrician onto reinforced concrete supports, and therefore have a rectangular arc. Combined claws and manholes are also produced. With their help you can climb wooden, metal and reinforced concrete supports.

The operating principle of lineman's claws is based on the fact that, under the influence of gravity, the platform with the electric lineman's leg begins to slide down while simultaneously rotating around its axis. In this case, the arc enters into an obstacle with the surface of the support, and sticks its spikes into the material (for wood), or rests the end of the spike against reinforced concrete or steel. Since the spikes are made from hardened structural steel of grades not lower than 40X according to GOST 4543-81, self-jamming of the spike on reinforced concrete occurs without damage to the spike, and, therefore, is very reliable. In order to increase safety, the number of spikes is at least three. For the most critical applications, replaceable studs made of hard alloys such as VK 25 or VK 30 are produced.

With increasing load on the spikes, the force of fixing the claws or manholes increases.

Which ones are better?

It is impossible to say for sure which claws are better and which are worse. Today there is a wide range of this device for working at height on the market. All claws are different. Therefore, in order to purchase the best option for yourself, you need to know the criteria by which to make a choice, namely:

on what basis will the lifting be carried out;

technical characteristics of the product - carefully study the document on the claws, in which pay attention to information such as load capacity, thickness and material of the belts; it is also very important to look at the production date and expiration date (almost all repair claws can be used for no more than 5 years);

integrity of the structure and all its elements;

compliance with TU, SNiP and GOST; the availability of quality certificates, which confirm that the product has passed all laboratory tests required by law, will help ensure this;

cost, it is best to choose expensive, high-quality products; you should not save, much less go for dubious promotions and discounts. Perhaps the low price is due to the fact that the permissible shelf life is coming to an end or the integrity of the structure is compromised;

manufacturer - this is another important aspect of the correct choice and purchase of a reliable product; give preference to a well-known brand.

Be sure to visually inspect the purchase, check for markings. A bona fide manufacturer must have all the documents for such equipment. If they are not there, it is better not to buy such a product.

Be sure to visually inspect your purchase and check for markings. A bona fide manufacturer must have all the documents for such equipment. If they are not there, it is better not to buy such a product.

Selection rules

When considering the models offered by manufacturers, you need to evaluate the following details:

For quality products, the seller must have an appropriate certificate.

• Price segment. It is dangerous to skimp on installation equipment. A low price may be a sign of poor quality materials from which the equipment is made. It is recommended to consider models from the middle and highest price categories.
• Company manufacturer. You should not choose a model from an unknown manufacturer. It is better to give preference to a trusted company.
• Qualitative indicators. A product of any type must have a certificate of compliance with TU and GOST. Metal parts must not be damaged. It is important to check that the seams are even and the thickness of the belts is at least 3 mm. The stitching on leather elements must be securely fastened.

The finished equipment indicates the release date of the product, trademark and batch number. Every six months, devices are checked for wear. A corresponding marking with the result is left on the hole. If the tools are used without errors, then they are allowed to work for at least a year. The more damage to the hooks, the lower the level of safety.

How to climb a pole

Not often, but there is a need to climb a power line pole on or near your suburban area. And although such a rise to heights requires professional skills, many do it on their own. How to climb a power line or street light pole in this article.

About the task of climbing a pole

The task of climbing a pole is not everyday in country life. This problem arises when connecting a house to power supply and is often solved by professional electricians. It would be strange if everyone who was not too lazy climbed the poles of overhead lines and, even worse, power lines and solved their problems without the participation of the servicing electric company.

However, in theory and in life, a domestic situation may arise in which you will need to climb onto a VLI pole yourself. The simplest example is to change the lamp in a street lamp located on a pole near your house.

The task of climbing a pole is interesting in itself, like the task of quickly climbing to a height in a country house. You don't necessarily need to climb a pole. More common tasks are to climb to the base of the roof or the gables of the second floor.

Of course, climbing a pole is not exactly the same as climbing from the street side to a second-floor window, but some solutions may be similar.

VLI pole height 0.4 kV

The power line of a suburban area is designed from wooden or concrete supports, less often metal poles 9-9.5 meters high. (read about power line supports). When installing such a pole, it is buried 2-2.5 meters into the ground. (read about installing the support). It is not difficult to calculate that the end of the pillar remains about 7 meters above the ground. It is clear that no one needs to climb to the top. To work, it is enough to rise to a working height not exceeding 6 meters. How to climb a pole 6 meters high.

What types of street lighting poles are there?

How to climb a pole?

Professionally, the task of climbing onto a support is solved with the help of a special electrician’s device called claws or installer’s manholes. They are put on the legs and, when climbing up a pole, they cling to it, creating support for a person’s mobility.

For wooden supports, mounting claws marked KM are used. They only work on wooden supports and wooden supports with a concrete “stepchild”. (read what a stepson is)

For concrete supports of type SB 95, universal manholes LU or universal claws KLM are used. Their catching part is not round, but rectangular or trapezoidal.

The manholes are put on the feet on hard shoes. Fastened to the leg with straps. The safety of the person climbing depends on proper securing. Manholes cost, by today's standards, inexpensively, about 2500-3500 rubles.

Here is a description of the LU-1 manholes:

Universal manholes LU-1 are used to climb onto a reinforced concrete pillar of trapezoidal cross-section VLI type CBll0-la, CB95-1/2a, SV105. The hole opening is adjustable. Includes carbide studs and leather straps.

Types of climbing cats

How to properly install street lighting

Depending on the design and purpose, all such devices are divided into claws for concrete pillars, manholes for wooden supports, dart climbers (devices used for climbing trees).

Manholes, claw-holes for reinforced concrete pillars

Catches for reinforced concrete pillars

This is the most common type of these devices, widely used by modern electricians and installers.

They consist of two oval support platforms with fastening straps for legs and rectangular grips up to 190-200 mm long, having 2 conical spikes on each of the short sides.

Claws for wooden posts

Crampons for wooden supports

Less common and less commonly used by modern electricians, manholes have one significant difference from the previous ones - their grips have a semicircular shape with a diameter of up to 220-315 mm and 5 spikes on each. The most famous model of such a device is the KM 1 brand claws.

Tree frogs

Tree frogs

Tree climbers have claws for climbing tree trunks. They are a curved “L”-shaped splint with a semicircular casing for the shin and a sharp triangular spike located on the outer part and a belt for fixing the foot. A similar device is used by high-altitude tree trimmers and hunters.

Areas of application of KLM2

Cats model KLM-2

Lazy claws marked KLM 2 are the most popular and widespread device. They are used for lifting reinforced concrete trapezoidal or rectangular supports with a diameter of up to 190 mm.

On a note. There is also a universal type of these devices, which has grips that allow you to climb most modern power transmission towers. The most famous model of such manholes is LU-2.

Defects in mounting claws

Due to the non-uniform surface, a reinforced concrete pole often causes defects in the tenons, the metal structure is damaged, and the sharpness of the tip is reduced, which affects the safety of the electrician. After restoration of the parts, the device must undergo additional examination and withstand static loads on the fastening belts of the footrests with a force of 1350 N, and a tensile stress of up to 675 N.

The solution of crampons for reinforced concrete supports, as well as their maximum lifting load, are measured before and after the test procedure, the results are recorded in the technical data sheet. The service life of lineman's claws, produced in accordance with the characteristics of concrete pillars, is determined individually, but the manufacturer sets a period of 60 months. Persons over 18 years of age and who have undergone special training are allowed to work at height.

If malfunctions are detected, it is prohibited to use the installation device or carry out repairs on your own. According to safety requirements, after 7 years of active use, the crampon or safety belt must be written off.

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Safety during work

Safety requirements for working at height include the selection of high-quality equipment. An electrician should not experience any inconvenience during his professional activities. The industry produces different types of personal protective equipment:

• safety harness belt PL-2
• strapless safety mounting belt
• fastening belts
• traverses - ZIP-2 and ZIP-3
• assembly spikes ZIP-4
• gaffs
• carbines
• blocking devices
• lanyard retaining adjusters
• dielectric overalls
• dielectric gloves.