CN114278139B - Mining-correcting cooperative power transmission tower maintenance method - Google Patents

Abstract

The invention relates to a mining-correcting cooperative power transmission tower maintenance method, which is used for the situation that a coal seam is shallowly buried and a power transmission line is arranged along the strike direction of the coal seam, wherein a first power transmission tower is arranged in the middle of the strike of a coal pillar supporting area, and the middle of a tower body of the first power transmission tower is set into a structure which can lift the upper part of the tower body and rotate the upper part of the tower body; arranging a second transmission tower on the full mining area, wherein the second transmission tower sets the middle part of the tower body into a structure which can enable the upper part of the tower body to rotate; according to the method, aiming at the subsidence characteristic of the mined-out goaf of the shallow-buried ore layer, power transmission towers with different deviation rectifying characteristics are arranged in different areas in a targeted manner, so that a deviation rectifying power transmission tower group applied to the mined-out goaf of the coal mine is formed; the power transmission tower set can be matched with dynamic subsidence in the stoping process of a working face in real time, so that a tower arm of the power transmission tower is always kept in a straight state; the adjusting layer is arranged at the middle upper part of the tower body, so that the adjusting difficulty is greatly reduced.

Description

A transmission tower maintenance method based on mining and rectification coordination

technical field

The invention relates to the field of transmission towers, in particular to a maintenance method for transmission towers that is applied to mine seam mining areas in cooperation with mining and correction.

Background technique

Transmission line iron tower (transmission tower) is a tower structure used to support and overhead wires. It is a towering tower structure that keeps wires and wires, wires and towers, wires from the ground or crossing objects at a specified safe distance. In the space truss structure, the rods are mainly composed of single equilateral angle steel or composite angle steel, and the rods are connected by bolts. Since the transmission tower is a tall structure, it is very sensitive to tilting deformation and has high requirements for uneven settlement of the foundation. Conventional transmission towers and their foundation structures are difficult to adapt to the surface movement and deformation of the coal mine goaf, which may cause the transmission tower to deflect or even overturn. In the existing technology, a deflection-correctable structure is generally installed at the base structure of the transmission tower to reduce the influence of the tilt caused by mining, but the structure is complex, maintenance is difficult after deflection correction, and the stability is poor. Yielding will cause the transmission tower to tilt instantly; at the same time, the existing transmission towers with deflection correction function do not match the deflection correction function with the dynamic law of mining surface subsidence/inclination, mainly after the ground surface subsidence/tilt is stable after mining. Poor targeting.

Contents of the invention

Aiming at the deficiencies in the above-mentioned prior art, the present invention provides a maintenance method for transmission towers in cooperation with mining and rectification, which is used in the case where the coal seam is buried shallowly and the transmission lines are arranged along the direction of the coal seam, including the following steps:

a. The mining area is mined from right to left. In the mining area, the mining face is arranged along the direction of the coal seam. In the coal pillar on the left side of the mining area, there is an upper hill in the mining area. The right side is the upper mountain coal pillar in the mining area adjacent to the right mining area, and the transmission line is arranged in the middle of the mining face inclined to the middle of the mining area;

The width of the coal pillar on the mountain in the mining area is W ₁ , the buried depth of the coal seam is H, the caving angle of the rock formation is δ, and the distance between the transmission towers is J. For shallow coal seams, H/tanδ+W ₁ /2<J is satisfied, and there is no need to Set transmission towers on the cantilever support area;

b. Arrange the first power transmission tower in the middle of the coal pillar support area, and the first power transmission tower sets the middle part of the tower body as a structure that can make the upper part of the tower body lift and rotate the upper part of the tower body;

Determine the length L of the mining face so that it satisfies L=(N-1)×JW ₁ , N is the number of transmission towers between two adjacent coal pillar support areas, and includes the coal pillar support area directly above transmission tower;

c. Arrange the second power transmission tower according to the distance J on the sufficient mining area, and the middle part of the tower body is set as a structure that can make the upper part of the tower body rotate in the second power transmission tower;

d. Carry out the recovery of the mining working face in the mining area from the middle to both sides, that is, first recover the mining working face directly below the transmission tower, and adopt the retreating mining method from right to left;

With the recovery of the mining face, the first transmission tower on the right side gradually returns to the left, and at this time, the upper part of the tower body is rotated to the right, so that the upper part of the tower body remains upright all the time;

With the recovery of the mining face, the second transmission tower first tilts to the right, and then gradually rotates the upper part of the tower to the left (counterclockwise), and then as the mining face continues to recover, the second transmission tower begins to return to the left , at this time, the upper part of the tower is gradually turned, and the whole process keeps the upper part of the second transmission tower upright;

With the continuous recovery of the mining face, the first transmission tower on the left side began to tilt to the right, and at this time, the upper part of the tower body was gradually turned to the left, so that the upper part of the tower body of the first power transmission tower on the left side was always kept upright;

e. Afterwards alternately mining the mining face on both sides;

f. After the mining area is recovered and the ground surface subsidence is stable, lower the upper part of the tower body of the first transmission tower as a whole to coordinate with the height of the second transmission tower; for the tower body of the first transmission tower and the second transmission tower on the right reinforcement in the middle;

g. When mining in the mining area on the left, refer to the maintenance method of the first transmission tower on the right side of the mining area to maintain the first transmission tower on the left side of the mining area.

Preferably, the first power transmission tower has a four-sided platform structure as a whole, including an upper tower body, a middle telescopic tower body, a middle rotating tower body, a lower tower body and a tower base connected sequentially from top to bottom; the middle telescopic tower body It includes lifting and telescopic columns parallel to the sides of the four-sided platform and vertical lifting and telescopic columns in the middle. The bottom end of the lifting and telescopic columns is connected and fixed by a steel frame; the middle rotating tower body includes a central rotating tower in the form of an inclined half-sided four-sided platform. Its top is fixed on the bottom of the middle telescopic tower body, its lower edge is hinged to the left side of the top of the lower tower body, the lower end of the rotating telescopic column is hinged to the right side of the top of the lower tower body, and the upper end is hinged to the right edge of the middle rotating tower base.

Preferably, the second power transmission tower has a quadrangular truss structure as a whole, including an upper tower body, a middle rotating tower body, a lower tower body and a tower base sequentially connected from top to bottom; The middle part of the rotating tower in the form of a prism is fixed on the bottom of the upper tower, and its lower edge is hinged to the left side of the top of the lower tower. The lower end of the rotating telescopic column is hinged to the right side of the top of the lower tower. right edge.

Further, the rotating telescopic column and the lifting telescopic column may be electronically controlled or hydraulically telescopic; tower walls are arranged along the front and back directions of the upper tower body to support the transmission lines.

Preferably, in step b, the step of determining the width W of the mining face is also included, so that it satisfies W>H, so as to ensure that the mining area in the middle of the working face has been fully mined along the inclination after mining.

Preferably, in step d, the rotating telescopic column is located on the right side;

With the recovery of the mining face in this mining area, the first transmission tower on the right side gradually returns to the left, and at this time, the rotating telescopic column is gradually shrunk, so that the upper tower body and the middle telescopic tower body are always kept upright;

With the recovery of the mining face, the second transmission tower first tilts to the right, and at this time the rotating telescopic column is gradually lifted up, and then as the mining face continues to recover, the second transmission tower begins to return to the left and gradually shrinks Rotate the telescopic column, the whole process keeps the upper body of the second transmission tower upright;

As the mining face continues to recover, the first transmission tower on the left begins to tilt to the right. At this time, the rotating telescopic column on the right is gradually lifted to make the upper body and middle telescopic tower body of the first transmission tower on the left Always maintain integrity.

Preferably, in step d, during the recovery process of the mining face, the telescopic tower body in the middle of the first power transmission tower can also be contracted to coordinate with the height of the second power transmission tower in real time.

Preferably, in step e, when the mining face close to the two sides of the central mining face before and after the mining, if the transmission tower is greatly affected by the mining and there is a tilt problem, refer to step d for deviation correction.

Preferably, in step f, the central telescopic tower body of the first power transmission tower is shrunk as a whole to coordinate with the height of the second power transmission tower; The middle part of the transmission tower rotates the tower body for reinforcement.

Further, the transmission tower truss is used for reinforcement or the transmission tower truss is used to replace the lifting telescopic column and the rotating telescopic column for reinforcement.

Beneficial effects: the present invention aims at the subsidence characteristics of the goaf after shallow-buried mine seam mining, and sets transmission towers with different deviation correction characteristics in different areas in a targeted manner to form a correctionable transmission tower group applied to the goaf of a coal mine; the power transmission The tower group can match the dynamic subsidence of the working face in real time, so that the tower arm of the transmission tower is always kept upright; the adjustment level is set in the middle and upper part of the tower body, which greatly reduces the difficulty of adjustment.

Description of drawings

Fig. 1 is the arrangement diagram of the deflection correctable transmission tower of the present invention in the coal mining area, the top is a top view, and the bottom is a cross-sectional view along the direction;

Fig. 2 is the first power transmission tower with correctable function of the present invention;

Fig. 3 is the second power transmission tower with correctable function of the present invention;

In Figure 1: Coal pillar 1 on the mountain in the mining area, coal pillar support area 11, first transmission tower 12, mining face 2, full mining area 21, second transmission tower 22, rock caving angle 4, and boundary line 5 , the intersection of the boundary line and the ground surface 6, the cantilever support area 7;

In Fig. 2: the first power transmission tower 12: the upper tower body 121, the middle telescopic tower body 122, the middle rotating tower base 123, the rotating telescopic column 124, the lower tower body 125, the tower base 126, and the tower wall 127;

In FIG. 3 : the second power transmission tower 22 : the upper tower body 221 , the middle rotating tower base 222 , the rotating telescopic column 223 , the lower tower body 224 , the tower base 225 , and the tower wall 226 .

Detailed ways

The technical solutions of the present invention will be described in more detail below in combination with the accompanying drawings in the embodiments of the present invention.

As shown in Figures 1-3, a deflection-correctable power transmission tower set for a coal mining area of the present invention includes a first power transmission tower 12 arranged on a coal pillar support area 11 and a second power transmission tower 12 arranged on a fully mining area 21. transmission tower 22;

The first power transmission tower 12 sets the middle part of the tower body as a structure that can lift and rotate the upper part of the tower body; specifically, the first power transmission tower 12 has a square-edge structure as a whole, including a top-down The upper tower body 121, the middle telescopic tower body 122, the middle rotating tower body, the lower tower body 125 and the tower base 126 connected in sequence; The lifting telescopic column, the bottom end of the lifting telescopic column is connected and fixed by a steel frame; the middle rotating tower body includes a middle rotating tower base 123 in the form of an oblique half-square prism, the top of which is fixed on the bottom surface of the middle telescopic tower body 122, and the lower edge Hinged with the left side of the top of the lower tower body 125, the lower end of the rotating telescopic column 124 is hinged to the right side of the top of the lower tower body 125, and the upper end is hinged to the right edge of the middle rotating tower base 123; the rotating telescopic column and the lifting telescopic column can be electrically controlled telescopic It can also be a hydraulically telescopic structure; a tower wall 127 is provided along the front and rear directions of the upper tower body 121 to support the transmission line;

The second power transmission tower 22 sets the middle part of the tower body as a structure that can make the upper part of the tower body rotate; specifically, the second power transmission tower 22 is in the form of a quadrangular platform as a whole, including upper towers connected sequentially from top to bottom Body 221, middle part rotating tower body, lower tower body 224 and tower base 225; Middle part rotating tower body comprises middle part rotating tower base 222 in the form of oblique semi-square prism, which is fixed on the bottom surface of upper tower body 221, and its lower edge Hinged with the left side of the top of the lower tower body 224, the lower end of the rotating telescopic column 223 is hinged to the right side of the top of the lower tower body 224, and the upper end is hinged to the right edge of the middle rotating tower base 222; the rotating telescopic column 223 can be electrically controlled and telescopic Hydraulically telescopic structure; a tower wall 226 is arranged along the front and rear directions of the upper tower body 221 for supporting the transmission line.

A transmission tower maintenance method using the above-mentioned deflection-correctable transmission tower group to carry out mining and correction coordination, which is used for shallow buried coal seams (generally referring to coal seams with a buried depth of less than 250m), and the transmission lines are basically arranged along the direction of the coal seam, including the following step:

a. The mining area is mined from right to left, and the mining face 2 is arranged along the direction of the coal seam in the mining area. The mining area uses the mining area to go up the mountain, and the right side of the mining area 2 is the coal pillar 1 in the mining area of the adjacent right mining area, and the power transmission line is arranged in the middle of the mining area inclined to the central part of the mining area 2;

The width of the coal pillar 1 on the mountain in the mining area is W ₁ , the buried depth of the coal seam is H, the caving angle 4 of the rock formation is δ, and the distance between the transmission towers is J. For shallow coal seams, the depth should satisfy H/tanδ+W ₁ / 2<J, that is, there is no need to install transmission towers on the cantilever support area 7;

For example, the width of the coal pillar on the mountain in the mining area of a certain mine is W ₁ =60m, the buried depth of the coal seam is H=200m, the collapse angle of the rock formation is 60°, the distance between the transmission towers is 300m, and the depth satisfies 200/tan 60°+ 60/2=145.47m<300m;

The surface area directly above the upper coal pillar in the mining area is the coal pillar support area 11 with a width of W ₁ ; The angle 4 formed between the caving boundary line 5 and the horizontal plane between the uncollapsed rock formations is the caving angle δ, and the junction 6 between the caving boundary line 5 and the surface divides the surface directly above the mining face 2 into two parts. The cantilever support area 7 adjacent to the coal pillar support area 11 on the side, and the full mining area 21 in the middle; after mining at the mining face 2 in the mining area, the surface subsidence in the full mining area 21 is basically the same, and there is almost no inclination , and the surface of the cantilever support area 7 will incline towards the direction of the full mining area 2; the length of the cantilever support area 7 is Lx=H/tanδ, and the length of the full mining area 21 is Lw=L-2×Lx.

b. Arrange the first power transmission tower 12 in the middle of the coal pillar support area 11, and the first power transmission tower 12 sets the middle part of the tower body as a structure that can make the upper part of the tower body lift and make the upper part of the tower body rotate;

Determine the length L of the mining face so that it satisfies L=(N-1)×JW ₁ , N is the number of transmission towers between two adjacent coal pillar support areas 11, and includes the coal pillar support area 11 the transmission tower directly above;

For example, if a mine installs 7 transmission towers between two adjacent coal pillar support areas 11, the length of the mining face L=(7-1)×300–60=1740m;

c. Arrange the second power transmission tower 22 according to the distance J on the full mining area 21. The second power transmission tower 22 sets the middle part of the tower body as a structure that can rotate the upper part of the tower body, and its rotating telescopic column 223 is located on the right side ;

d. Carry out the mining of the mining face 2 in the mining area from the middle to both sides, that is, first recover the mining face directly below the transmission tower, and adopt a retreating mining method from right to left;

The mining interval adopts the mining sequence from right to left, that is, the mining area on the right has been recovered, and at this time the lower tower body 125 and tower base 126 of the first power transmission 12 on the right are in a state of tilting to the right. The rotating telescopic column 124 on the right makes the upper tower body 121 and the middle telescopic tower body 122 in an upright state, and the lifting telescopic column is in a retracted state;

Along with the recovery of the mining face 2 in this mining area, the first power transmission tower 12 on the right side is gradually tilted to the left (returning to the right), and at this time, the rotating telescopic column 124 is gradually contracted, so that the upper tower body 121 and the middle telescopic tower body 122 are always maintain integrity;

Along with the mining of the mining face 2, the second power transmission tower 22 tilts to the right first, and now gradually lifts the rotating telescopic column 223, and then along with the continuation of the mining face 2, the second power transmission tower 22 begins to tilt to the left ( Back to normal), at this time, the rotating telescopic column 223 is gradually contracted, and finally with the formation of the flat bottom structure in the fully mining area, the tower base 225 returns to the level, and the whole process keeps the upper tower body 221 of the second power transmission tower upright all the time;

Along with the continuation mining of mining working face 2, the first power transmission tower 12 on the left side begins to tilt to the right, at this moment, the rotating telescopic column 124 on the right side is gradually lifted, so that the upper tower body 121 of the first power transmission iron tower on the left side and The telescopic tower body 122 in the middle keeps upright all the time;

For the first power transmission tower, when the mining area on one side is back mined, the first power transmission tower is inclined towards the direction of the mining area. Since it is a shallow buried coal seam, the inclination is relatively large, so the rotating telescopic column 124 on the right side is lifted The upper tower body 121 and the middle telescopic tower body 122 are in an upright state, and it will return to the upright state (the mining areas on the left and right sides are symmetrical) after the mining area on the other side is mined. 121 and middle telescopic tower body 122 are in upright state.

e. Afterwards, the mining working faces on both sides are alternately mined back and forth. When the mining working faces on both sides of the central mining working face are close to each other before and after mining, if the transmission tower is greatly affected by mining and there is a tilt problem, refer to step d for deviation correction;

In terms of inclination, due to the symmetrical recovery of the mining working planes on the front and rear sides, the final transmission tower will not incline to both sides, so there is no need to correct the deviation in inclination;

f. After the mining area is completed and the surface subsidence is stable, shrink the central telescopic tower body 122 of the first power transmission tower 12 as a whole to coordinate with the height of the second power transmission tower 22; for the central telescopic tower of the first power transmission tower on the right Body 122, the central rotating tower body and the middle rotating tower body of the second transmission tower are reinforced, or conventional transmission tower trusses are used to replace the lifting telescopic column and the rotating telescopic column to realize reinforcement;

g. When the mining area on the left is mined, refer to the maintenance/adjustment method of the first transmission tower on the right side of the mining area to maintain/adjust the first transmission tower on the left side of the mining area (right side of the left mining area).

Preferably, in step b, the step of determining the width W of the mining face is also included, so that it satisfies W>H, so as to ensure that the mining area in the middle of the working face has been fully mined along the inclination, such as the width of the working face of a certain mine is 250m .

Preferably, in step d, during the recovery process of the mining face, the telescopic tower body in the middle of the first power transmission tower 12 can also be contracted to coordinate with the height of the second power transmission tower 22 in real time.

Claims (8)

1. A transmission tower maintenance method coordinated by mining and rectification, which is used in the case where the coal seam is shallowly buried and the transmission line is arranged along the direction of the coal seam, is characterized in that it includes the following steps: a. The mining area is mined from right to left. In the mining area, the mining face is arranged along the direction of the coal seam. In the coal pillar on the left side of the mining area, there is an upper hill in the mining area. The right side is the upper mountain coal pillar in the mining area adjacent to the right mining area, and the transmission line is arranged in the middle of the mining face inclined to the middle of the mining area; The width of the coal pillar on the mountain in the mining area is W ₁ , the buried depth of the coal seam is H, the caving angle of the rock formation is δ, and the distance between the transmission towers is J. For shallow coal seams, H/tanδ+W ₁ /2<J is satisfied, and there is no need to Set transmission towers on the cantilever support area; b. Arrange the first power transmission tower in the middle of the coal pillar support area, and the first power transmission tower sets the middle part of the tower body as a structure that can make the upper part of the tower body lift and rotate the upper part of the tower body; Determine the length L of the mining face so that it satisfies L=(N-1)×JW ₁ , N is the number of transmission towers between two adjacent coal pillar support areas, and includes the coal pillar support area directly above transmission tower; c. Arrange the second power transmission tower according to the distance J on the sufficient mining area, and the middle part of the tower body is set as a structure that can make the upper part of the tower body rotate in the second power transmission tower; d. Carry out the recovery of the mining working face in the mining area from the middle to both sides, that is, first recover the mining working face directly below the transmission tower, and adopt the retreating mining method from right to left; With the recovery of the mining face, the first transmission tower on the right side gradually returns to the left, and at this time, the upper part of the tower body is rotated to the right, so that the upper part of the tower body remains upright all the time; With the recovery of the mining face, the second transmission tower first tilts to the right, and at this time gradually rotates the upper part of the tower body to the left, and then as the mining face continues to recover, the second transmission tower begins to return to the left, and at this time gradually Turn the upper part of the tower, and the whole process keeps the upper part of the second transmission tower upright; With the continuous recovery of the mining face, the first transmission tower on the left side began to tilt to the right, and at this time, the upper part of the tower body was gradually turned to the left, so that the upper part of the tower body of the first power transmission tower on the left side was always kept upright; e. Afterwards alternately mining the mining face on both sides; f. After the mining area is recovered and the ground surface subsidence is stable, lower the upper part of the tower body of the first transmission tower as a whole to coordinate with the height of the second transmission tower; for the tower body of the first transmission tower and the second transmission tower on the right reinforcement in the middle; g. When mining in the mining area on the left, refer to the maintenance method of the first transmission tower on the right side of the mining area to maintain the first transmission tower on the left side of the mining area. 2. The maintenance method for transmission towers according to claim 1, characterized in that, the first transmission tower has a four-sided platform structure as a whole, including an upper tower body, a middle telescopic tower body, and a middle rotating tower connected sequentially from top to bottom. The tower body, the lower tower body and the tower base; the middle telescopic tower body includes lifting telescopic columns parallel to the sides of the four-sided platform and vertical lifting telescopic columns in the middle, and the bottom ends of the lifting telescopic columns are connected and fixed by steel frames; the middle rotating tower The body consists of a central rotating tower in the form of an oblique semi-square prism, the top of which is fixed to the bottom of the middle telescopic tower body, its lower edge is hinged to the left side of the top of the lower tower body, and the lower end of the rotating telescopic column is hinged to the right side of the top of the lower tower body. The upper end is hinged to the right edge of the rotating tower base in the middle; tower walls are arranged along the front and back directions of the upper tower body. 3. The transmission tower maintenance method according to claim 1 or 2, characterized in that, the second transmission tower has a four-sided platform structure as a whole, including an upper tower body, a middle rotating tower body, The lower tower body and the tower base; the middle rotating tower body includes a middle rotating tower base in the form of an oblique half-square prism, the top of which is fixed on the bottom surface of the upper tower body, and the lower edge is hinged to the left side of the top of the lower tower body, and adopts rotating telescopic The lower end of the column is hinged to the right side of the top of the lower tower body, and the upper end is hinged to the right edge of the rotating tower base in the middle; tower walls are arranged along the front and rear directions of the upper tower body. 4. The transmission tower maintenance method according to claim 3, characterized in that, in step b, also includes the step of determining the width W of the mining face, so that it satisfies W>H, so as to ensure that the working face in the middle is recovered along the mining area. The trend has been fully exploited. 5. The transmission tower maintenance method according to claim 3, in step d, the rotating telescopic column is located on the right side; With the recovery of the mining face in this mining area, the first transmission tower on the right side gradually returns to the left, and at this time, the rotating telescopic column is gradually shrunk, so that the upper tower body and the middle telescopic tower body are always kept upright; With the recovery of the mining face, the second transmission tower first tilts to the right, and at this time the rotating telescopic column is gradually lifted up, and then as the mining face continues to recover, the second transmission tower begins to return to the left and gradually shrinks Rotate the telescopic column, the whole process keeps the upper body of the second transmission tower upright; As the mining face continues to recover, the first transmission tower on the left begins to tilt to the right. At this time, the rotating telescopic column on the right is gradually lifted to make the upper body and middle telescopic tower body of the first transmission tower on the left Always maintain integrity. 6. The transmission tower maintenance method according to claim 5, in step d, during the recovery process of the mining face, the telescopic tower body in the middle of the first transmission tower can also be contracted to coordinate with the height of the second transmission tower in real time. 7. The transmission tower maintenance method according to claim 3, in step e, when the mining face is close to the both sides of the central mining face before and after the mining, if the transmission tower is greatly affected by the mining and there is an inclination problem, refer to the step d Correction. 8. The transmission tower maintenance method according to claim 3, in step f, the central telescopic tower body of the first transmission tower is contracted as a whole to coordinate with the height of the second transmission tower; to the middle part of the first transmission tower on the right side The telescopic tower body, the middle rotating tower body and the middle rotating tower body of the second transmission tower are reinforced.

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