A method for erecting a pole by means of a pulley block suitable for use in the field and on various terrains

Abstract

The application relates to the technical field of electric power engineering, and discloses a pulley set method for erecting a power pole which is suitable for fields and various terrains, and at least comprises the following steps: S1, pulley set and related setting; and S2, erecting principle and process. The pulley set method for erecting a power pole is suitable for any construction site and any terrain in the field, has strong applicability, is simple to operate, convenient to use, greatly reduces construction difficulty, improves construction efficiency, guarantees the safety of construction personnel, reduces the demand for manpower through the labor-saving principle of the pulley set, guarantees the safety of construction personnel, is simple in tool and material, simple in production, low in cost, and is favorable for reducing construction cost.

Description

Technical Field

[0001] This invention relates to the field of power engineering technology, and in particular to a pulley system method for erecting utility poles suitable for field use and various terrains. Background Technology

[0002] In the construction, daily operation and maintenance, and major repair and technical renovation of the power distribution network of county-level power supply enterprises, the erection of cement poles is a crucial link, but it also poses significant safety hazards. Traditional pole erection methods often have many limitations when facing complex terrain and different construction environments, such as complex operation, labor-intensive, low safety, and high requirements for construction sites. Therefore, a safer, more efficient, and more widely applicable pole erection method is needed. Summary of the Invention

[0003] The purpose of this invention is to provide a pulley system for erecting utility poles suitable for field conditions and various terrains, in order to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention provides a method for erecting utility poles using pulley systems suitable for outdoor use and various terrains, comprising the following steps:

[0005] S1, pulley blocks and related supporting devices;

[0006] S2. The principle and process of pole erection.

[0007] Preferably, the specific methods for S1, the pulley block, and the supporting devices are as follows;

[0008] S1-1. Use fixed pulley blocks and movable pulley blocks with three or four grooves. Three-groove pulleys correspond to 6 folds of steel rope, and four-groove pulleys correspond to 8 folds of steel rope.

[0009] S1-2. Set up the main ground anchor (first ground anchor) and the ground anchor (second ground anchor) to tie the base of the pole. The number of first ground anchors shall be determined according to the geological conditions and the weight of the pole. The steel rope of the second ground anchor shall be tied to the base of the pole to prevent the base of the pole from being dragged away from the pole pit.

[0010] S1-3. Install an A-frame derrick. Dig a small pit 5-10cm deep at the base of the derrick to secure it. The initial position of the derrick should form a 45-60 degree angle with the ground. Install a movable pulley system at the top of the derrick. The base of the derrick should be at three-quarters of the way up the pole. The steel wire rope attached to the pole should have its two ends at two points on the upper middle part of the pole, about 3 meters apart. The point of force application at the top of the derrick and the connection point of the steel wire rope attached to the pole should be the movable point, i.e., the vertex of the triangle should be the movable point. The steel wire rope attached to the top of the derrick should use an adjustable force application method, so that the force application point of the pole can be dynamically adjusted according to the center of gravity of the pole during the erection process.

[0011] S1-4. Fix two swaying ropes to the top of the pole.

[0012] Preferably, the specific methods in S2, the principle of pole erection, and the process steps are as follows;

[0013] Based on the fixed pulley block on the first ground anchor and the movable pulley block at the top of the derrick, when the third steel rope is pulled, the derrick moves clockwise to stand upright, and the top of the pole moves accordingly. When the derrick is upright and perpendicular to the ground, the pole forms a 30-45 degree angle with the ground. Continue pulling the third steel rope until the angle between the pole and the ground is 80-85 degrees, then stop pulling the third steel rope. Then backfill the soil. When 80% of the soil has been backfilled, straighten the pole. Continue backfilling the soil until a soil layer 30cm above the ground is formed as an anti-sinking platform.

[0014] Preferably, the first ground anchor in S-2 can be a double ground anchor, a triple ground anchor, or a quadruple ground anchor, depending on the geological conditions and the weight of the pole.

[0015] Preferably, in S1-3, the steel rope that is tied to the top of the pole is put into the groove using a pulley, so that the stress point can be adjusted as the pole is continuously erected.

[0016] Preferably, the operator pulls the first end of the third steel rope, and the operator stays away from the pole erection site to ensure personnel safety.

[0017] Preferably, it is not necessary to use ground anchors and guy ropes to fix the pole; only two ground anchors are needed: one to fix one end of the pulley block and the other to the base of the pole.

[0018] Preferably, for a bolted pole with a diameter of 190x12 meters, the weight is about 1.1 tons, and only 7-8 people with ordinary strength are needed to pull the third steel cable to erect the pole.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The pulley system for erecting utility poles of the present invention is applicable to any construction site and any terrain in the field, and has strong applicability;

[0021] 2. Simple operation and easy to use greatly reduce construction difficulty and improve construction efficiency;

[0022] 3. By utilizing the labor-saving principle of pulley systems, the required manpower is reduced while ensuring the safety of construction workers;

[0023] 4. The tools and materials are simple, easy to make, and inexpensive, which helps to reduce construction costs. Attached Figure Description

[0024] Figure 1 This is a side view of the external structure of the present invention;

[0025] Figure 2 This is a front view of the external structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the displacement structure used in this invention;

[0027] Figure 4 This is a schematic diagram of the displacement termination structure of the present invention.

[0028] In the diagram: 1. Ground; 2. Pole pit; 3. Walkway; 4. Cement pole; 5. Swing rope; 6. First rigid rope; 7. A-frame derrick; 8. Second rigid rope; 9. First ground anchor; 10. Moving pulley block; 11. Third steel rope; 12. Fixed pulley block; 13. Second ground anchor. Detailed Implementation

[0029] Unless the context clearly indicates otherwise, nouns without quantifiers and nouns modified by "the" include singular and plural indicators of persons / kinds.

[0030] As used in the specification and claims, the terms “comprising,” “including,” “having,” “may,” “containing,” and variations thereof are open transitional phrases, terms, or words that require the presence of a specified ingredient / step and allow the presence of other ingredients / steps. However, such a description should be interpreted as also describing the composition or method as consisting of the ingredients / steps listed “by” and “substantially by,” which allows only the specified ingredient / step and any unavoidable impurities that may arise therefrom to be present, and excludes other ingredients / steps.

[0031] The numerical values ​​in the specification and claims of this application should be understood to include the same numerical values ​​when reduced to the same number of significant figures and numerical values ​​that differ from the stated values ​​by less than the experimental error of conventional measurement techniques used to determine the stated values ​​of the type described in this application.

[0032] All ranges disclosed herein include the indicated endpoints and can be combined independently (e.g., the range “2 g to 10 g” includes the endpoints 2 g and 10 g, as well as all intermediate values).

[0033] The terms “about” and “approximately” can be used to include any numerical value that may vary without altering its fundamental function. When used with a range, “about” and “approximately” also disclose a range defined by the absolute values ​​of its two endpoints; for example, “about 2 to about 4” also discloses a range of “2 to 4”. Typically, the terms “about” and “approximately” can refer to ±10% of the indicated number. However, for temperature, the term “approximately” refers to ±1°C.

[0034] Unless otherwise expressly stated, the percentage of elements shall be considered as the weight percentage of the alloy.

[0035] This disclosure may relate to temperatures in certain method steps. It should be noted that these parameters generally refer to the temperature set by the heat source (such as a furnace), and not necessarily the temperature that the heated material must reach.

[0036] Please see Figure 1-4 This invention provides a technical solution: a method for erecting utility poles using pulley systems suitable for field use and various terrains, comprising the following steps:

[0037] S1, pulley blocks and related supporting devices;

[0038] S1-1. Use a fixed pulley block 12 with three or four grooves and a movable pulley block 10. The three-groove pulley corresponds to a 6-fold steel rope, and the four-groove pulley corresponds to an 8-fold steel rope.

[0039] S1-2. Set up the main ground anchor (first ground anchor 9) and the ground anchor (second ground anchor 13) for securing the base of the pole 4. The number of first ground anchors 9 shall be determined according to the geological conditions and the weight of the pole 4. The first ground anchors 9 may be double ground anchors, triple ground anchors or four ground anchors depending on the geological conditions and the weight of the pole 4. The steel rope of the second ground anchor 13 shall be secured to the base of the pole to prevent the base of the pole from being dragged away from the pole pit.

[0040] S1-3. Set up an A-frame derrick 7. Dig a small pit 5-10cm deep at the foot of the derrick to fix the foot of the derrick. Its initial position is at an angle of 45-60 degrees to the ground 1. Set up a movable pulley group 10 at the top of the derrick. The root of the A-frame derrick 7 is at three-quarters of the way down the pole 4. The first steel rope 6 that is tied to the pole 4 on the A-frame derrick 7 should have its two ends at two points in the upper middle part of the pole 4, about 3 meters apart. The point of force application at the top of the A-frame derrick 7 and the connection point of the first steel rope 6 that is tied to the pole 4 is the movable point, that is, the vertex of the triangle is the movable point. The first steel rope 6 that is tied to the top of the A-frame derrick 7 and the pole 4 should use an adjustable point of force application. In this way, the point of force application on the pole 4 can be dynamically adjusted according to the center of gravity of the pole 4 during the erection process.

[0041] S1-4. Fix two swaying ropes 5 at the top of pole 4.

[0042] S2. The principle and process of pole erection;

[0043] Based on the fixed pulley block 12 on the first ground anchor 9 and the movable pulley block 10 at the top of the pole, the operator pulls the first end of the third steel rope 11, keeping the operator away from the pole erection site to ensure safety. When pulling the third steel rope 11, it is not necessary to use ground anchors and guy ropes to fix the pole; only two ground anchors are needed: one to fix one end of the pulley block 12 and the other to tie to the base of the pole 4. The pole moves clockwise to stand upright, and the top of the pole 4 moves accordingly. When the pole stands upright to the ground level... When the pole is vertical, the pole 4 forms a 30-45 degree angle with the ground 1. Continue pulling the third steel cable 11 until the angle between the pole 4 and the ground 1 is 80-85 degrees, then stop pulling the third steel cable 11. For a bolted pole with a diameter of 190 x 12 meters, the weight is about 1.1 tons. It only takes 7-8 people with ordinary strength to pull the third steel cable 11 to erect the pole 4. Then backfill the soil. When 80% of the soil is backfilled, straighten the pole 4. Continue backfilling the soil until the soil layer is 30 cm above the ground as an anti-sinking platform.

[0044] Specific steps: Use a three- or four-groove fixed pulley block 12 and a movable pulley block 10. The three-groove pulley corresponds to a 6-fold steel rope, and the four-groove pulley corresponds to an 8-fold steel rope. Set up a main ground anchor (first ground anchor 9) and a ground anchor (second ground anchor 13) to secure the base of the pole 4. The number of first ground anchors 9 is determined according to the geological conditions and the weight of the pole 4. The first ground anchors 9 can be double, triple, or quadruple, depending on the geological conditions and the weight of the pole 4. The steel rope of the second ground anchor 13 should be secured to the base of the pole to prevent the base from being dragged away from the pole pit. Set up an A-frame derrick 7. Dig a small pit 5-10cm deep at the location to fix the pole feet. The initial position of the pole feet should form a 45-60 degree angle with the ground. A movable pulley system 10 should be installed at the top of the pole. The base of the human-shaped pole 7 should be at three-quarters of the way down the pole 4. The first steel rope 6, which is attached to the pole 4, should have its two ends at two points on the upper middle part of the pole 4, approximately 3 meters apart. The point of contact between the apex of the human-shaped pole 7 and the first steel rope 6 attached to the pole 4 should be the moving point, i.e., the apex of the triangle should be the moving point. The first steel rope 6 attached to the top of the human-shaped pole 7 should... Using an adjustable force point method, the force point of pole 4 is dynamically adjusted according to the center of gravity of pole 4 during the erection process. Two swaying ropes 5 are fixed at the top of pole 4. Based on the fixed pulley block 12 on the first ground anchor 9 and the movable pulley block 10 at the top of the pole, the operator pulls the first end of the third steel rope 11. The operator is far away from the pole erection site to ensure personnel safety. When pulling the third steel rope 11, it is not necessary to use ground anchors and guy ropes to fix the pole. Only two ground anchors are needed: one to fix one end of the pulley block 12 and the other to tie to the base of pole 4. The pole is moved clockwise to stand upright, and the top of pole 4 follows suit. When the pole is erected to be perpendicular to the ground 1, pole 4 forms a 30-45 degree angle with the ground 1. Continue pulling the third steel cable 11 until the angle between pole 4 and the ground 1 is 80-85 degrees, then stop pulling the third steel cable 11. For a bolted pole with a diameter of 190x12 meters, the weight is about 1.1 tons. It only takes 7-8 people with ordinary strength to pull the third steel cable 11 to erect pole 4. Then backfill the soil. When 80% of the soil is backfilled, straighten pole 4. Continue backfilling the soil until a soil layer 30cm above the ground is formed as an anti-sinking platform.

[0045] Example 1:

[0046] S1, pulley block and related supporting devices

[0047] S1-1. Using a three-groove fixed pulley block 12 and a movable pulley block 10, the steel rope is folded into 6 sections.

[0048] S1-2. Set up the first ground anchor 9 and the second ground anchor 13. The first ground anchor 9 can be a double ground anchor pile according to the geological conditions and the weight of the pole 4.

[0049] S1-3. Set up an A-frame derrick 7. Dig a small pit about 5cm deep at the base of the derrick, with its initial position at a 45-degree angle to the ground 1. Set up a movable pulley system 10 at the top of the A-frame derrick 7. The base of the A-frame derrick 7 is at three-quarters of the way down the pole 4. The first steel rope 6 that is tied to the pole 4 on the A-frame derrick 7 should have its two ends at two points on the upper middle part of the pole 4, about 3 meters apart. The point of force application at the top of the A-frame derrick 7 and the connection point of the first steel rope 6 that is tied to the pole 4 is the movable point, that is, the vertex of the triangle is the movable point. The first steel rope 6 that is tied to the top of the A-frame derrick 7 and the pole 4 should use an adjustable point of force application. In this way, the point of force application on the pole 4 can be dynamically adjusted according to the center of gravity of the pole 4 during the erection process.

[0050] S1-4. Fix two swaying ropes 5 at the top of pole 4.

[0051] S2. The principle and process of pole erection;

[0052] Based on the fixed pulley block 12 on the first ground anchor 9 and the movable pulley block 10 at the top of the derrick, when the third steel rope 11 is pulled, the derrick moves clockwise to stand upright, and the top of the pole 4 moves accordingly. When the derrick stands upright and perpendicular to the ground 1, the pole 4 forms a 30-degree angle with the ground 1. Continue pulling the steel rope until the angle between the pole 4 and the ground 1 is 80 degrees, then stop pulling the third steel rope 11. For a bolted pole with a diameter of 190 x 12 meters, the weight is about 1.1 tons. Only 7-8 people with ordinary strength are needed to pull the third steel rope 11 to stand the pole 4. Then backfill the soil. When 80% of the soil is backfilled, straighten the pole 4. Continue backfilling the soil until a soil layer 130 cm above the ground is formed as an anti-sinking platform.

[0053] Specific steps: Use a three-groove fixed pulley block 12 and a movable pulley block 10. Fold the steel rope 6. Set up the first ground anchor 9 and the second ground anchor 13. The first ground anchor 9 can be a double ground anchor pile depending on the geological conditions and the weight of the pole 4. Set up an A-frame derrick 7. Dig a small pit 5cm deep at the foot of the derrick, with its initial position at a 45-degree angle to the ground 1. Set up the movable pulley block 10 at the top of the A-frame derrick 7. The base of the A-frame derrick 7 is at three-quarters of the way down the pole 4. The first steel rope 6 that is tied to the pole 4 on the A-frame derrick 7 should have its two ends at two points on the upper part of the pole 4, about 3 meters apart. The point of force application at the top of the A-frame derrick 7 and the connection point of the first steel rope 6 that is tied to the pole 4 is the movable point, that is, the vertex of the triangle is the movable point. The first steel rope 6 that is tied to the top of the A-frame derrick 7 and the pole 4 should use an adjustable force application method. In this way, the stress point of pole 4 is dynamically adjusted according to the center of gravity of pole 4 during the erection process. Two swaying ropes 5 are fixed at the top of pole 4. Based on the fixed pulley group 12 on the first ground anchor 9 and the movable pulley group 10 at the top of the pole, when the third steel rope 11 is pulled, the pole moves clockwise to stand upright, and the top of pole 4 moves accordingly. When the pole stands perpendicular to the ground 1, pole 4 forms a 30-degree angle with the ground 1. Continue pulling the steel rope until the angle between pole 4 and the ground 1 is 80 degrees, then stop pulling the third steel rope 11. For a bolted pole with a diameter of 190 x 12 meters, the weight is about 1.1 tons. Only 7-8 people with ordinary strength are needed to pull the third steel rope 11 to erect pole 4. Then backfill the soil. When 80% of the soil is backfilled, the pole 4 is corrected. Continue backfilling the soil until a soil layer 30 cm above the ground is formed as an anti-sinking platform.

[0054] Example 2:

[0055] S1, pulley system and related settings

[0056] S1-1, adopts a four-groove fixed pulley block 12 and a movable pulley block 10, corresponding to 8 folds in the steel rope;

[0057] S1-2. Set the first ground anchor 9 and the second ground anchor 13. Based on the geology and the weight of the pole 4, the first ground anchor 9 is determined to be four ground anchor piles.

[0058] S1-3. Install an A-frame derrick 7. Dig a small pit about 10cm deep at the base of the A-frame derrick 7. Its initial position is at a 60-degree angle to the ground 1. Install a movable pulley system 10 at the top of the A-frame derrick 7. The base of the A-frame derrick 7 is at three-quarters of the distance from the pole 4. The center of gravity of the steel rope attached to the pole 4 on the A-frame derrick 7 is at two-thirds of the distance from the pole 4. The steel rope attached to the pole 4 at the top of the A-frame derrick 7 uses an adjustable force point method. The steel rope attached to the pole 4 at the top of the A-frame derrick 7 is put into the groove using pulleys. The force point can be adjusted as the pole 4 is continuously erected.

[0059] S1-4. Fix two swaying ropes 5 at the top of pole 4.

[0060] S2. The principle and process of pole erection;

[0061] Based on the fixed pulley block 12 on the first ground anchor 9 and the movable pulley block 10 at the top of the derrick, when the third steel rope 11 is pulled, the top of the pole 4 moves accordingly. When the A-frame derrick 7 is erected to be perpendicular to the ground 1, the pole 4 forms a 45-degree angle with the ground 1. Continue pulling the third steel rope 11 until the angle between the pole 4 and the ground 1 is 85 degrees, then stop pulling the third steel rope 11. For a bolted pole with a diameter of 190 x 12 meters, the weight is about 1.1 tons. Only 7-8 people with ordinary strength are needed to pull the third steel rope 11 to erect the pole 4. Then backfill the soil. When 85% of the soil is backfilled, straighten the pole 4. Continue backfilling the soil until a soil layer 30 cm above the ground is formed as an anti-sinking platform.

[0062] Specific steps: A four-groove fixed pulley system 12 and a movable pulley system 10 are used, corresponding to an 8-fold steel rope. First ground anchor 9 and second ground anchor 13 are installed. Based on the geology and the weight of the pole 4, the first ground anchor 9 consists of four anchor piles. An A-frame derrick 7 is installed, with a small pit dug 10cm deep at the base of the derrick, its initial position forming a 60-degree angle with the ground. A movable pulley system 10 is installed at the top of the A-frame derrick 7. The base of the A-frame derrick 7 is at three-quarters of the distance from the pole 4. The center of gravity of the steel rope attached to the pole 4 on the A-frame derrick 7 is at two-thirds of the distance from the pole 4. The steel rope attached to the pole 4 at the top of the A-frame derrick 7 uses an adjustable stress point method. The steel rope attached to the pole 4 at the top of the A-frame derrick 7 is threaded into the groove using pulleys. As the pole 4 is continuously erected... The force point can be adjusted. Two swaying ropes 5 are fixed at the top of the pole 4. Based on the fixed pulley group 12 on the first ground anchor 9 and the movable pulley group 10 at the top of the A-frame derrick 7, when the third steel rope 11 is pulled, the top of the pole 4 moves accordingly. When the A-frame derrick 7 is erected to be perpendicular to the ground 1, the pole 4 forms a 45-degree angle with the ground 1. Continue pulling the third steel rope 11 until the angle between the pole 4 and the ground 1 is 85 degrees, then stop pulling the third steel rope 11. For a bolted pole with a diameter of 190 x 12 meters, the weight is about 1.1 tons. Only 7-8 people with ordinary strength are needed to pull the third steel rope 11 to erect the pole 4. Then backfill the soil. When 85% of the soil is backfilled, straighten the pole 4. Continue backfilling the soil until the soil layer is 30 cm above the ground as an anti-sinking platform.

[0063] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for erecting utility poles using pulley systems suitable for field conditions and various terrains, characterized in that, Includes the following steps: S1, pulley blocks and related supporting devices; S2. The principle and process of pole erection.

2. The method for erecting utility poles using pulley systems suitable for field conditions and various terrains as described in claim 1, characterized in that: The specific methods for S1, the pulley block and the supporting device are as follows; S1-1. Use fixed pulley blocks and movable pulley blocks with three or four grooves. Three-groove pulleys correspond to 6 folds of steel rope, and four-groove pulleys correspond to 8 folds of steel rope. S1-2. Set up the main ground anchor (first ground anchor) and the ground anchor (second ground anchor) to tie the base of the pole. The number of first ground anchors shall be determined according to the geological conditions and the weight of the pole. The steel rope of the second ground anchor shall be tied to the base of the pole to prevent the base of the pole from being dragged away from the pole pit. S1-3. Install an A-frame derrick. Dig a small pit 5-10cm deep at the base of the derrick to secure it. The initial position of the derrick should form a 45-60 degree angle with the ground. Install a movable pulley system at the top of the derrick. The base of the derrick should be at three-quarters of the way up the pole. The steel wire rope attached to the pole should have its two ends at two points on the upper middle part of the pole, about 3 meters apart. The point of force application at the top of the derrick and the connection point of the steel wire rope attached to the pole should be the movable point, i.e., the vertex of the triangle should be the movable point. The steel wire rope attached to the top of the derrick should use an adjustable force application method, so that the force application point of the pole can be dynamically adjusted according to the center of gravity of the pole during the erection process. S1-4. Fix two swaying ropes at the top of the pole.

3. The method for erecting utility poles using pulley systems suitable for field conditions and various terrains as described in claim 1, characterized in that: The specific methods in the S2, pole erection principle and process steps are as follows; Based on the fixed pulley block on the first ground anchor and the movable pulley block at the top of the derrick, when the third steel rope is pulled, the derrick moves clockwise to stand upright, and the top of the pole moves accordingly. When the derrick is upright and perpendicular to the ground, the pole forms a 30-45 degree angle with the ground. Continue pulling the third steel rope until the angle between the pole and the ground is 80-85 degrees, then stop pulling the third steel rope. Then backfill the soil. When 80% of the soil has been backfilled, straighten the pole. Continue backfilling the soil until a soil layer 30cm above the ground is formed as an anti-sinking platform.

4. The method for erecting utility poles using pulley systems suitable for field conditions and various terrains as described in claim 1, characterized in that: The first ground anchor in S-2 can be a double ground anchor, a triple ground anchor, or a quadruple ground anchor, depending on the geological conditions and the weight of the pole.

5. The method for erecting utility poles using pulley systems suitable for field conditions and various terrains as described in claim 1, characterized in that: In S1-3, the steel rope attached to the top of the pole is put into the groove using a pulley. As the pole is continuously erected, the stress point can be adjusted.

6. The method for erecting utility poles using pulley systems suitable for field conditions and various terrains as described in claim 1, characterized in that: Workers pull the first end of the third steel rope, and keep away from the pole erection site to ensure personnel safety.

7. The method for erecting utility poles using pulley systems suitable for field conditions and various terrains as described in claim 1, characterized in that: No ground anchors or guy ropes are needed to secure the pole; only two ground anchors are required: one to secure one end of the pulley block and the other to the base of the pole.

8. The method for erecting utility poles using pulley systems suitable for field conditions and various terrains, as described in claim 1, is characterized in that: A bolted pole with a diameter of 190 x 12 meters weighs approximately 1.1 tons, and it can be erected by 7-8 people with average strength pulling a third steel cable.

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