CN109238051B

CN109238051B - Method for removing risks in single-tower blasting demolition of power transmission tower with angle steel structure

Info

Publication number: CN109238051B
Application number: CN201810505051.8A
Authority: CN
Inventors: 李本伟; 陈德志; 周应军; 胡浩川; 罗鹏; 甄梦阳; 陈晨
Original assignee: Sinosteel Corp Wuhan Safety And Environmental Protection Research Institute Co ltd
Current assignee: Sinosteel Corp Wuhan Safety And Environmental Protection Research Institute Co ltd
Priority date: 2018-05-24
Filing date: 2018-05-24
Publication date: 2021-03-23
Anticipated expiration: 2038-05-24
Also published as: CN109238051A

Abstract

The invention discloses a method for blasting demolition and risk elimination of a single tower of a power transmission tower with an angle steel structure. The method comprises the following steps: step 1: the dismantling range is clear; step 2: dismantling the connecting member between the power transmission tower and the outside; and step 3: determining a dumping direction; and 4, step 4: determining the position of the incision; and 5: performing incision treatment; step 6: installing a medicine bag; and 7: safety protection; and 8: networking and detonating. The construction method is simple, and the prefabricated part can be manufactured before construction, so that the time cost is greatly saved, and the construction period is shortened; the prefabricated member is simple to install and easy to operate.

Description

Method for removing risks in single-tower blasting demolition of power transmission tower with angle steel structure

Technical Field

The invention belongs to the technical field of engineering blasting, and particularly relates to a method for blasting demolition of a single tower of an L-shaped non-cylindrical steel structure power transmission tower, in particular to a method for blasting demolition risk elimination of a single tower of a power transmission tower with an angle steel structure.

Background

High-voltage power transmission is particularly used for constructing an extra-high voltage power grid, so that different power plants (such as thermal power plants and hydraulic power plants) constructed in different places can be mutually supported and supplemented, the intensive development of western coal resources and hydraulic resources can be promoted, and the power generation cost is reduced; the continuously increased power demand in the middle-east region can be ensured, and the environmental pollution caused by building thermal power plants in densely populated and economically developed regions is reduced; and simultaneously, the method can promote the harmonious development of economy and society in areas with dense western resources and underdeveloped economy. As the most important structure in a power transmission system, a power transmission tower is also largely constructed in various parts of China in recent years. Meanwhile, considering the cost and the actual situation of power transmission network construction, the power transmission tower is often erected in the mountains and the mountains. The power transmission tower bears the load of a power transmission cable and simultaneously bears the wind load and the unstable load caused by natural disasters such as snowstorm, frost and the like. These accidents have resulted in a large number of towers being deformed or structurally damaged and requiring replacement. Meanwhile, with the development of the power industry technology, some old line towers are also under the condition of updating. The dismantling of old power towers becomes very important.

At present, the dismantling of the diagonal steel structure power transmission tower in China still stays in the primary stage of manual dismantling. High labor intensity, low working efficiency and high construction risk. When the angle steel medium member or the building is demolished by blasting, because the structure is hollow or even a plate-type material, the blasting cannot be performed by punching, and only the blasting process of externally applying the energy-gathered explosive bag can be adopted.

And blasting of the externally applied energy-gathered explosive bag has obvious technical defects.

1. The detonation velocity of the civil explosive is low, and the processed shaped explosive package needs a large amount of explosive to penetrate through steel materials.

2. High velocity explosives are tube products while cutting cartridges into unconventional cartridges cannot be produced on a large scale.

3. Blasting of the energy-gathered explosive bags needs to adopt high-brisance and high-detonation-velocity explosives which are mostly tube products and are difficult to realize for civil use; meanwhile, the energy-gathered explosive charge processed by the high-brisance high-detonation velocity explosive can only jet to act on plate blasting cutting, namely, only a slot can be cut on a steel plate, and a large opening cannot be generated, so that the whole structure is damaged and destabilized.

4. The explosive powder bag is externally applied, the work-doing capability of explosive clinging to an object to be demolished is locally concentrated at a contact part, most of the energy of explosive not clinging to the object to be demolished is not directly acted on the demolished object, most of the energy is useless, and the generated explosion shock wave, blasting flyrock and noise are difficult to prevent and control and cannot be implemented in living and production environments with complex environments.

5. The blasting of building concrete in cylindric only is applicable to the great cylindric steel construction of cross sectional area, and the job site concreting is long with the maintenance time, and the operation of punching destroys the concrete structure of having pour, and the inside damage of concrete is unknown, and it is big to influence the welding and the operation degree of difficulty of pouring under the charge judgement and the complex environment.

Disclosure of Invention

The invention provides a method for blasting demolition and risk elimination of a single tower of a power transmission tower with an angle steel structure, aiming at overcoming the defects of the prior art and aiming at the structural characteristics of a building of the angle steel structure of the power transmission tower.

The technical solution of the invention is as follows: a method for blasting demolition and risk elimination of a single tower of a power transmission tower with an angle steel structure comprises the following steps:

step 1: determining the dismantling range, and determining whether the transmission line and other transmission line towers on the upper part of the transmission tower need to be protected;

step 2: dismantling a connecting member between the power transmission tower and the outside, wherein the connecting member comprises a power transmission cable;

and step 3: determining the pouring direction: according to the instability condition of the line tower, the gravity center shifting direction is taken as the toppling direction;

and 4, step 4: determining the position of the incision: the notch is arranged at the bottom of the power transmission tower; the danger-eliminating blasting charge part is selected behind the inclined and toppled part; high explosion height of cutHCalculated according to the following formula:

H=（0.8~1.7）R

in the formula:His blast height (m);

Requivalent radius for projection of the support surface R = (S/π)^1/2；（m）

SThe projected area of the supporting surface is a square meter;

and 5: performing incision treatment;

step 6: installing a medicine bag; the explosive package mode for installing the explosive package comprises blasting demolition of a center-charging punching-free solid-state filling angle steel structure, blasting demolition of a center-charging punching-free fluid-state filling angle steel structure, blasting demolition of a center-charging punching-free granular filling angle steel structure, blasting demolition of a center-charging punching-free solid-state filling integral module angle steel, blasting demolition of a center-charging granular filling integral module angle steel, blasting demolition of a center-charging fluid-state filling split module angle steel, blasting demolition of an eccentric-charging solid-state filling integral module angle steel and blasting demolition of an eccentric-charging solid-state filling split module angle steel;

and 7: safety protection;

and 8: networking and detonating.

According to the embodiment of the invention, the blasting demolition method for the center-charging punching-free solid-state filling angle steel structure in the step 6 comprises the following steps:

firstly, making an auxiliary angle steel which is the same as the angle steel to be demolished by blasting;

seamlessly welding the auxiliary angle steel and the angle steel to be demolished by blasting into a cylindrical steel beam with a rectangular cross section, and seamlessly welding a back cover with the bottom of the steel beam by using a steel plate;

thirdly, transversely cutting a pre-crack at the back of the angle steel to be dismantled;

pouring concrete into the steel beam along the opening at the upper end of the steel beam, inserting a PVC pipe into the concrete along the center of the steel beam after a certain height is reached, keeping the embedded PVC pipe vertical, continuously pouring the concrete between the inner wall of the steel beam and the outer wall of the embedded PVC pipe until the concrete is leveled with the opening of the steel beam after sedimentation, and curing the poured concrete;

fifthly, filling the explosive package along the pre-buried PVC pipe, and then using stemming to plug the opening of the PVC pipe.

According to the embodiment of the invention, the blasting demolition method for the center-charging punching-free flow state filling angle steel structure in the step 6 comprises the following steps:

firstly, selecting an angle steel with the same size as the angle steel to be blasted and the length of 1.5 m;

welding the angle steel to be blasted and angle steel to be blasted into a square pipe in a designed blasting position in an opposite mode, and welding a steel plate at a bottom pipe orifice to enable the angle steel to be blasted, the angle steel to be welded and the steel plate to form a cylinder shape;

thirdly, cutting 9 cutting seams with the length of 2cm at intervals of 10cm from the position 35cm above the angle steel to be blasted and the angle steel to be welded by using a hand-held angle grinder;

cutting 16 cutting seams with the length of 2cm on the two side faces of the angle steel every 10cm from the position of 40cm, and sealing the welding seams by using glue;

taking a PVC pipe with the length of 1.5m and the inner diameter of 40mm, and winding two iron wires at the positions of 10cm at two ends to form a cross-shaped fixing device;

sixthly, putting the PVC pipe into the welding cylinder to ensure that the PVC pipe is positioned at the center of the welding cylinder;

seventhly, filling water into the welding pipe and the PVC pipe;

fixing the initiating explosive bag on the thin rope according to the designed explosive charging structure, and hanging a balance weight at the loading end to enable the explosive bag to sink to the designed position.

According to the embodiment of the invention, the blasting demolition method for the center-charging hole-punching-free granular filling angle steel structure in the step 6 comprises the following steps:

pouring granular media into the steel beam along the opening at the upper end of the steel beam, inserting a PVC pipe into the granular media along the center of the steel beam after the height is reached, keeping the embedded PVC pipe vertical, and continuously pouring the granular media along the space between the inner wall of the steel beam and the outer wall of the embedded PVC pipe until the granular media are leveled with the opening of the steel beam after sedimentation;

According to the embodiment of the invention, the blasting demolition method for the center-charged solid-filled integral module angle steel in the step 6 comprises the following steps:

firstly, manufacturing die angle steel which is the same as the angle steel to be demolished by blasting;

horizontally placing the die angle steel on the ground, and packaging the side edge and the bottom of the angle steel into a u-shaped groove die by using three baffles; pouring concrete into the u-shaped groove die, putting a pre-buried PVC pipe with a sealed bottom on the concrete after the concrete reaches a certain height, wherein the seal of the PVC pipe is positioned in the angle steel, and the opening of the PVC pipe is slightly longer than the angle steel; continuously pouring concrete into the u-shaped groove die until the height of the concrete is the same as that of the vertical edge of the angle steel after the settlement is finished;

curing the poured concrete, demolding after curing is finished, opening the u-shaped groove mold and removing three boards to obtain an integrally assembled prefabricated module consisting of the concrete, the PVC pipe and the mold angle steel;

fourthly, transversely cutting a pre-crack at the back of the angle steel to be dismantled;

fixing the integrally assembled prefabricated module to the angle steel to be dismantled;

sixthly, filling a explosive package along the pre-buried PVC pipe, and then using the stemming to plug the opening of the PVC pipe.

According to the embodiment of the invention, the step 6 blasting demolition method for the angle steel of the center-charging solid-state filling split module comprises the following steps:

welding the long side of the auxiliary angle steel and the angle steel to be demolished to form a hollow cylindrical steel beam with a rectangular section;

the bottom of the hollow cylindrical steel beam is welded in a seamless mode through a steel plate made of the same materials as the angle steel;

fourthly, manufacturing a plastic cuboid box-shaped mould by taking the data of two edges of the demolished angle steel through blasting as the length and the width, wherein the bottom of the box-shaped mould is sealed, and only the upper end of the box-shaped mould is open;

placing the rectangular box-shaped mold on a horizontal ground, and vertically fixing and placing a suction pipe along the inner wall of the mold; pouring concrete along the opening at the upper end of the mould to keep the inner cavity of the suction pipe free of concrete; after the concrete is poured to a certain height, vertically embedding a reserved PVC pipe in the center of the rectangular mould and on the poured concrete after the concrete naturally settles, wherein the reserved PVC pipe is inserted into the poured concrete by 1 cm;

sixthly, continuously pouring concrete between the outer wall of the PVC pipe and the inner wall of the cuboid-shaped mould until the concrete naturally settles to be flush with the opening at the upper end of the cuboid-shaped mould;

seventhly, curing the poured concrete, and demolding after curing is finished to obtain a split assembly type prefabricated module;

preparing two same split assembled prefabricated modules according to the method, filling 2# rock emulsion explosive and detonating tube detonators into the three split assembled charging modules along a reserved PVC pipe, and plugging the reserved PVC pipe with stemming to the opening of the PVC pipe to obtain three split assembled charged modules which are named as No. I, No. II and No. III split assembled charged modules respectively; pre-cracks are cut in the hollow cylindrical steel beam in the transverse direction;

filling stemming into the welded bottom of the hollow cylindrical steel beam from the opening and filling the compacted hollow cylindrical steel beam into a No. I split assembly type filled module; then, continuously filling stemming into the hollow cylindrical steel beam along the opening to the top of the No. I split assembly type charged module, pulling out the detonating tube in the No. I split assembly type charged module, enabling the detonating tube to pass through a reserved suction pipe opening in the No. II split assembly type charged module, and then putting the No. II split assembly type charged module; filling stemming into the hollow cylindrical steel beam along the opening to the top of the No. II split assembled charged module, pulling out the detonating tube in the No. II split assembled charged module and the detonating tube in the No. I split assembled charged module which passes through the reserved suction pipe opening in the No. II split assembled charged module, enabling the two detonating tubes to pass through the reserved suction pipe opening in the No. III split assembled charged module, and then putting the No. III split assembled charged module into the hollow cylindrical steel beam; filling stemming into the hollow cylindrical steel beam along the opening to reach the upper orifice of the hollow cylindrical steel beam; three detonating tubes in the three split assembled charged modules are grabbed into one bundle.

According to the embodiment of the invention, the blasting demolition method for the center-charged granular filling integral module angle steel in the step 6 comprises the following steps:

the bottom of the hollow cylindrical steel beam is welded in a seamless mode through a steel plate made of the same materials as the angle steel; fourthly, transversely cutting a pre-crack at the back of the angle steel to be dismantled;

using data of two edges of the blasting demolition angle steel as length and width to manufacture a plastic cuboid cylindrical mold, wherein the bottom of the mold is sealed, and only the upper end of the mold is open;

erecting a plastic cuboid cylindrical mold, filling a particle medium into the mold along an upper end opening, after the particle medium is filled to a certain height, embedding an embedded PVC pipe with the length slightly higher than the upper end opening into the center of the mold after the particle medium naturally settles, continuously filling the particle medium between the outer wall of the embedded PVC pipe and the inner wall of the mold until the particle medium is slightly lower than the upper end opening height of the mold after the particle medium naturally settles, and keeping the mold and the embedded PVC pipe in a vertical state all the time;

seventhly, medicine bags are filled along the upper end opening of the pre-buried PVC pipe according to the designed medicine amount, and then stemming is used for blocking the pipe orifice of the PVC pipe to obtain a prefabricated granular medium medicine filling module;

and packing the prefabricated granular medium charging module into the hollow cylindrical steel beam.

According to the embodiment of the invention, the blasting demolition method for the angle steel of the center charging flow state filling split module in the step 6 comprises the following steps:

welding pre-buried PVC with the same length as the cylindrical mold at the bottom of the plastic cuboid cylindrical mold, and overlapping the central axis of the PVC pipe with the plastic cuboid cylindrical mold;

seventhly, erecting the plastic cuboid cylindrical mold, and filling an aqueous medium between the inner wall of the plastic cuboid cylindrical mold and the outer wall of the embedded PVC pipe along the upper end opening until the aqueous medium is filled in the space between the inner wall of the plastic cuboid cylindrical mold and the outer wall of the embedded PVC pipe, so that the mold and the embedded PVC pipe are always in a vertical state;

hot melting and sealing the position between the inner wall of the mold filled with the water medium and the outer wall of the PVC pipe by using a plastic plate at the opening of the plastic cuboid cylindrical mold;

filling stemming to the bottom of the embedded PVC pipe along the pipe orifice of the PVC pipe, filling explosive packages along the upper end opening of the embedded PVC pipe according to the designed dosage, and blocking the pipe orifice of the PVC pipe by using the stemming to obtain a prefabricated aqueous medium charging module; and (4) loading the prefabricated aqueous medium charging module into the hollow cylindrical steel beam.

According to the embodiment of the invention, the method for blasting demolition of the eccentric charging solid filling integral module angle steel in the step 6 comprises the following steps:

horizontally placing the die angle steel on the ground, and packaging the side edge and the upper and lower openings of the angle steel into a u-shaped groove die with a rectangular cross section by using three baffles; embedding an embedded PVC pipe with a bottom cover at the right angle position in the angle steel and close to the edge of the angle steel, wherein the bottom cover of the PVC pipe is positioned in the angle steel, and the opening of the PVC pipe is flush with the top of the angle steel; pouring concrete into the u-shaped groove die, covering the PVC pipe, and then continuing pouring concrete into the u-shaped groove die until the height of the concrete is the same as the height of the opening of the u-shaped groove after the settlement is finished;

curing the poured concrete, demolding after curing is finished, opening a u-shaped groove mold to remove three boards and mold angle steel, and obtaining an integrally-assembled prefabricated eccentric module consisting of the concrete and the PVC pipe; fourthly, transversely cutting the pre-cracks on the angle steel to be dismantled close to the back of the right angle;

fifthly, mounting the integrally assembled prefabricated eccentric module on the angle steel to be dismantled; fixing the integrally assembled prefabricated eccentric module to the angle steel to be dismantled by using the die angle steel;

According to the embodiment of the invention, the method for blasting and dismantling the angle steel of the eccentric charging solid filling split module in the step 6 comprises the following steps:

making an auxiliary angle steel which is the same as the angle steel to be demolished by blasting;

placing the rectangular box-shaped mold on a horizontal ground, and vertically fixing and placing a suction pipe along the inner wall of the mold; pouring concrete along the opening at the upper end of the mould to keep the inner cavity of the suction pipe free of concrete; after the concrete is poured to a certain height, vertically embedding a reserved PVC pipe in a right angle of the rectangular mould after the concrete naturally settles, clinging to the inner wall of the mould, inserting the reserved PVC pipe into the poured concrete, wherein the length of the reserved PVC pipe is 1 cm;

seventhly, curing the poured concrete, and demolding after curing is finished to obtain a split assembly type prefabricated eccentric module;

preparing two same split assembled prefabricated eccentric modules according to the method, filling 2# rock emulsion explosive and detonating tube detonators into the three split assembled charging modules along the reserved PVC pipe, and plugging the reserved PVC pipe with stemming to the opening of the PVC pipe to obtain three split assembled charged eccentric modules which are named as No. I, No. II and No. III split assembled charged eccentric modules respectively; pre-cracks are cut in the hollow cylindrical steel beam in the transverse direction;

filling stemming into the welded bottom of the hollow cylindrical steel beam from the opening, filling a No. I split assembly type filled module after compaction, and keeping the embedded PVC pipe to be attached to the right-angle side in the angle steel to be dismantled; then, continuously filling stemming into the hollow cylindrical steel beam along the opening to the top of the No. I split assembly type charged module, pulling out the detonating tube in the No. I split assembly type charged module, enabling the detonating tube to pass through a reserved suction pipe opening in the No. II split assembly type charged module, and then putting the No. II split assembly type charged module; filling stemming into the hollow cylindrical steel beam along the opening to the top of the No. II split assembled charged module, pulling out the detonating tube in the No. II split assembled charged module and the detonating tube in the No. I split assembled charged module which passes through the reserved suction pipe opening in the No. II split assembled charged module, enabling the two detonating tubes to pass through the reserved suction pipe opening in the No. III split assembled charged module, and then putting the No. III split assembled charged module into the hollow cylindrical steel beam; filling stemming into the hollow cylindrical steel beam along the opening to reach the upper orifice of the hollow cylindrical steel beam; three detonating tubes in the three split assembled charged modules are grabbed into one bundle.

The invention realizes the prefabricated module assembly type blasting demolition of the steel structure through three key technical points:

1. the purpose of hole-punching-free hole charging blasting is achieved through 9 charging modes;

2. reserving a medicine loading hole, and adjusting and selecting the medicine amount, the medicine loading mode, the spacing mode and the type of the spacer according to actual conditions;

3. the explosive hole is reserved, and the filler restrains detonation products and detonation energy of the explosive, so that the energy utilization rate is improved, and the occurrence of secondary blasting hazards is reduced.

By adopting the technical scheme, compared with the existing method, the method has the advantages that:

1. the 2# rock emulsion explosive is easier to obtain than a tubular explosive;

2. the utilization rate of the explosive is high, the cost of the explosive is saved, and the smaller amount of the explosive reaches the expected target;

3. various charging modes and interval modes can be selected, and the work-doing capability of the explosive is more fully utilized;

4. the explosive is filled into the angle steel, so that flying stones and shock waves generated by explosion are less harmful, and the angle steel is easy to protect;

5. the construction method is simple, and the prefabricated part can be manufactured before construction, so that the time cost is greatly saved, and the construction period is shortened;

6. the prefabricated member is simple to install and easy to operate.

Drawings

Fig. 1 is a schematic diagram of a transmission tower.

Fig. 2 is a schematic diagram of a burst cut.

Fig. 3 is a schematic view of an angle member.

FIG. 4 is a blasting demolition method of a center-charging punching-free solid-state filling angle steel structure.

FIG. 5 illustrates a blasting demolition method for a center-charging punching-free flow-state filling angle steel structure.

FIG. 6 is a blasting demolition method of a center-charging punching-free granular filling angle steel structure.

FIG. 7 illustrates a blasting demolition method for center-charge solid-filled monolithic modular angle steel.

FIG. 8 is a blasting demolition method for angle steel of center-charge solid-state filling split modules.

FIG. 9 illustrates a blasting demolition method for center-charge granular filling integral module angle steel.

FIG. 10 illustrates a blasting demolition method for center-charged flow-state filling split module angle iron.

FIG. 11 illustrates a method for demolishing angle steel blasting by using an eccentric charging solid filling integral module.

FIG. 12 illustrates a method for blasting and dismantling angle steel of an eccentric charging solid filling split module.

In the figure: 101-a power transmission tower; 102-a cut; 1-auxiliary angle steel; 2, dismantling the angle steel to be blasted; 3-steel sheet; 4-medicine package; 5-PVC pipe; 6-pre-cutting a seam; 7-PVC pipe fixing device; 8-water; 9-string; 10-a counterweight; 11-split assembly type prefabricated modules; 12-a nonel detonator; 13-a straw; 14-a cuboid cylindrical mold; 15-stemming; 16 plastic sheet material.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

A method for blasting demolition and risk elimination of a single tower of a power transmission tower with an angle steel structure comprises the following steps.

1) The demolition range is determined, the upper part of the transmission tower 101 is connected with other transmission towers through transmission cables, and the demolition range is determined to determine whether the transmission line and other transmission towers need to be protected.

2) Removing the connection means of the power transmission tower 101 to the outside includes a power transmission cable; cutting the cable by adopting an annular melting and blasting device; the explosion-fusion cutting steel cable and transmission cable device effectively utilizes explosion heat to realize the fusing cutting of the cable, thereby not only reducing the labor intensity, but also avoiding the requirement on high-intensity detonation waves and avoiding the explosion hazard.

3) Determining the pouring direction: according to the instability of the line tower, the gravity center shifting direction is taken as the falling direction.

4) Determination of the position of the incision 102: the cut-out 102 should be placed at the bottom of the transmission tower. However, different from general demolition, demolition blasting generally requires blasting a support member in the toppling direction, and in the danger elimination process, the center of gravity of the power transmission tower is already deviated, so that the support member is structurally damaged due to the combined action of the front support force and the rear tension force, and the risk of safety accidents exists during construction; therefore, the danger-eliminating blasting charge part is selected behind the inclined and toppled part. The transmission tower 101 is ensured to topple by breaking the balance by eliminating the pulling force.

6) And (4) safety protection.

7) Networking and detonating.

Wherein 6) the pack is installed as follows.

The construction period is abundant, the construction environment is good, the angle steel has a single structure, and welding construction conditions exist on site; the medicine package mode is: a blasting demolition method of a center-charging punching-free solid-state filling angle steel structure; blasting demolition method of center-charging punching-free flow-state filling angle steel structure; a blasting demolition method for a center-charging punching-free granular filling angle steel structure.

The construction period is tight, the structure is single, the welding construction condition is not available on the site, and the traffic condition is better; the medicine package mode is: blasting demolition method for angle steel of center-charged solid filling integral module; provided is a blasting demolition method for angle steel of a center-charging solid-state filling split module.

The construction period is tight, the structure is single, the welding construction condition is not available on the site, and the traffic condition is poor; the medicine package mode is: blasting demolition method for angle steel of center-charged granular filling integral module; a blasting demolition method for angle steel of a center-charging flow-state filling split module.

The structure is various, and the welding construction condition is not available on site; the medicine package mode is: an eccentric charging solid filling integral module angle steel blasting demolition method; provided is a blasting demolition method for angle steel of an eccentric charging solid filling split module.

Wherein 6) the pack mode of the pack is as follows.

(1) Blasting demolition method for center-charging punching-free solid filling angle steel structure, as shown in figure 4

Firstly, making an auxiliary angle steel 1 which is the same as the angle steel 2 to be demolished by blasting; seamlessly welding the auxiliary angle steel 1 and the angle steel 2 to be demolished by blasting into a cylindrical steel beam with a rectangular cross section, and seamlessly welding a back cover with the bottom of the steel beam by using a steel plate 3; thirdly, transversely cutting a pre-crack 6 at the back of the angle steel 2 to be demolished by blasting; pouring concrete into the steel beam along the opening at the upper end of the steel beam, inserting a PVC pipe 5 into the concrete along the center of the steel beam after a certain height is reached, keeping the embedded PVC pipe 5 vertical, continuing pouring the concrete between the inner wall of the steel beam and the outer wall of the embedded PVC pipe 5 until the settled concrete is level with the opening of the steel beam, and maintaining the poured concrete; fifthly, filling explosive packages along the pre-buried PVC pipe 5, and then using stemming to plug the opening of the PVC pipe; and finishing the preparation work before blasting, such as protection, warning and the like, and then detonating.

(2) Blasting demolition method for center-charging punching-free flow-state filling angle steel structure, as shown in figure 5

Firstly, selecting an auxiliary angle steel 1 with the same type as the angle steel 2 to be demolished by blasting and the length of 1.5 m; welding the angle iron 2 and the angle iron 2 to be demolished by blasting into a square tube in a designed blasting position, and welding a steel plate 3 at a bottom pipe orifice to weld the angle iron 2 to be demolished by blasting, the auxiliary angle iron 1 and the steel plate into a tube shape; thirdly, cutting 9 cutting seams with the length of 2cm at intervals of 10cm from the position 35cm above the angle steel to be blasted and demolished and the angle steel attached with a hand-held angle grinder; cutting 16 cutting seams with the length of 2cm on the two side faces of the angle steel every 10cm from the position of 40cm, and sealing the welding seams by using glue; taking a PVC pipe 5 with the length of 1.5m and the inner diameter of 40mm, and winding two iron wires at the positions of 10cm at two ends to form a cross-shaped PVC pipe fixing device 7; sixthly, putting the PVC pipe 5 into the welding cylinder to ensure that the PVC pipe 5 is positioned at the center of the welding cylinder; seventhly, filling water 8 into the welding pipe and the PVC pipe; fixing the initiating explosive bag 4 on a thin rope 9 according to a designed explosive charging structure, and hanging 10 counter weights at a charging end to enable the explosive bag to sink to a designed position; and ninthly, blasting can be carried out after preparation work before blasting such as warning and protection is finished.

(3) Blasting demolition method for center-charging punching-free granular filling angle steel structure, as shown in figure 6

Firstly, making an auxiliary angle steel 1 which is the same as the angle steel 2 to be demolished by blasting; seamlessly welding the auxiliary angle steel 1 and the angle steel 2 to be demolished by blasting into a cylindrical steel beam with a rectangular cross section, and seamlessly welding a back cover with the bottom of the steel beam by using a steel plate 3; thirdly, transversely cutting the pre-cutting seam 6 at the back of the angle steel 2 to be demolished by blasting; pouring granular media into the steel beam along the opening at the upper end of the steel beam, inserting a PVC pipe 5 into the granular media along the center of the steel beam after the steel beam reaches a certain height, keeping the embedded PVC5 pipe vertical, and continuously pouring the granular media between the inner wall of the steel beam and the outer wall of the embedded PVC pipe 5 until the granular media are leveled with the opening of the steel beam after sedimentation; fifthly, filling 4 bags of the explosive along the pre-buried PVC pipe 5, and then using stemming to block the opening of the PVC pipe 5; and finishing the preparation work before blasting, such as protection, warning and the like, and then detonating.

(4) Blasting demolition method for angle steel of center-charged solid filling integral module, as shown in fig. 7

Firstly, making an auxiliary angle steel 1 which is the same as the angle steel 2 to be demolished by blasting; secondly, horizontally placing the auxiliary angle steel 1 on the ground, and packaging the side edge and the bottom of the angle steel into a u-shaped groove die by using three baffles; pouring concrete into the u-shaped groove die, putting the concrete into a pre-buried PVC pipe 5 with a sealed bottom after the concrete reaches a certain height, wherein the seal of the PVC pipe 5 is positioned in the angle steel, and the opening of the PVC pipe 5 is slightly longer than the angle steel; continuously pouring concrete into the u-shaped groove die until the height of the concrete is the same as that of the vertical edge of the angle steel after the settlement is finished; curing the poured concrete, demolding after curing is finished, opening the u-shaped groove mold and removing three boards to obtain an integrally assembled prefabricated module consisting of the concrete, the PVC pipe 5 and the mold angle steel; fourthly, transversely cutting the precut slot 6 at the back of the angle steel to be dismantled; fixing the integrally assembled prefabricated module on the angle steel 2 to be blasted and demolished; sixthly, filling a medicine package 4 along the pre-buried PVC pipe 5, and then plugging the pipe orifice of the PVC pipe 5 by using stemming; and protection, warning and other preparation before blasting can be initiated.

(5) The angle steel blasting demolition method of the center-charging solid-state filling split module is shown in figure 8

Firstly, making an auxiliary angle steel 1 which is the same as the angle steel 2 to be demolished by blasting; welding the long side of the auxiliary angle steel 1 and the angle steel 2 to be demolished by blasting to form a hollow cylindrical steel beam with a rectangular section; the bottom of the hollow cylindrical steel beam is welded in a seamless mode through a steel plate 3 made of the same material as the angle steel; fourthly, manufacturing a plastic cuboid box-shaped mould by taking the data of two edges of the blasting demolition angle steel 2 as the length and the width, wherein the bottom of the box-shaped mould is sealed, and only the upper end of the box-shaped mould is open; placing the rectangular box-shaped mould on a horizontal ground, and vertically fixing and placing a suction pipe 13 along the inner wall of the mould; pouring concrete along the opening at the upper end of the mould to keep the inner cavity of the suction pipe 13 free of concrete; after the concrete is poured to a certain height, vertically embedding a reserved PVC pipe 5 in the center of the rectangular mould and on the poured concrete after the concrete naturally settles, wherein the reserved PVC pipe 5 is inserted into the poured concrete by 1 cm; sixthly, continuously pouring concrete between the outer wall of the PVC pipe 5 and the inner wall of the cuboid mould until the concrete naturally settles to be flush with the upper opening of the cuboid mould; seventhly, curing the poured concrete, and demolding after curing is finished to obtain a split assembly type prefabricated module 11; preparing two same split assembled prefabricated modules 11 according to the method, filling 2# rock emulsion explosive and detonating tube detonators 12 into the three split assembled charging modules along the reserved PVC pipe 5, and then plugging the three split assembled charging modules to the pipe orifice of the PVC pipe 5 along the reserved PVC pipe 5 by using stemming to obtain three split assembled charged modules which are named as No. I, No. II and No. III split assembled charging modules respectively. Pre-cracks are cut in the hollow cylindrical steel beam in the transverse direction; filling stemming into the welded bottom of the hollow cylindrical steel beam from the opening and filling the compacted hollow cylindrical steel beam into a No. I split assembly type filled module; then, continuously filling stemming into the hollow cylindrical steel beam along the opening to the top of the No. I split assembly type charged module, pulling out the detonating tube in the No. I split assembly type charged module, enabling the detonating tube to pass through a reserved suction pipe opening in the No. II split assembly type charged module, and then putting the No. II split assembly type charged module; filling stemming into the hollow cylindrical steel beam along the opening to the top of the II # split assembled charged module, pulling out the detonating tube in the II # split assembled charged module and the detonating tube in the I # split assembled charged module which passes through the reserved suction pipe opening in the II # split assembled charged module, enabling the two detonating tubes to pass through the 13 reserved suction pipe openings in the III # split assembled charged module, and then putting the III # split assembled charged module into the III # split assembled module; filling stemming into the hollow cylindrical steel beam along the opening to reach the upper orifice of the hollow cylindrical steel beam; three detonating tubes in the three split assembled charged modules are grabbed into one beam, and detonation can be carried out after preparation work before blasting, such as warning, protection and the like, is finished.

(6) Blasting demolition method for angle steel of center-charged granular filling integral module, as shown in fig. 9

Firstly, making an auxiliary angle steel 1 which is the same as the angle steel 2 to be demolished by blasting; welding the long side of the auxiliary angle steel 1 and the angle steel 2 to be demolished by blasting to form a hollow cylindrical steel beam with a rectangular section; the bottom of the hollow cylindrical steel beam is welded in a seamless mode through a steel plate 3 made of the same material as the angle steel; fourthly, transversely cutting a pre-crack 6 at the back of the angle steel to be dismantled; using data of two edges of the blasting demolition angle steel as length and width to manufacture a plastic cuboid cylindrical mold, wherein the bottom of the mold is sealed, and only the upper end of the mold is open; erecting a rectangular plastic cylindrical mold, filling a particle medium into the mold along an upper end opening, after the mold is filled to a certain height, embedding an embedded PVC pipe 5 with the length slightly higher than the upper end opening into the center of the mold after the particle medium naturally settles, continuously filling the particle medium between the outer wall of the embedded PVC pipe 5 and the inner wall of the mold until the particle medium naturally settles to the height slightly lower than the upper end opening of the mold, and keeping the mold and the embedded PVC pipe 5 in a vertical state all the time; seventhly, filling medicine bags 4 along the upper end opening of the pre-buried PVC pipe 5 according to the designed medicine amount, and then blocking the pipe orifice of the PVC pipe 5 by using stemming to obtain a prefabricated granular medium charging module; and packing the prefabricated granular medium charging module into the hollow cylindrical steel beam.

(7) The angle steel blasting demolition method of the center-charged fluidized filling split module, as shown in fig. 10

Firstly, making an auxiliary angle steel 1 which is the same as the angle steel 2 to be demolished by blasting; welding the long side of the auxiliary angle steel 1 and the angle steel 2 to be demolished by blasting to form a hollow cylindrical steel beam with a rectangular section; the bottom of the hollow cylindrical steel beam is welded in a seamless mode through a steel plate 3 made of the same material as the angle steel; fourthly, transversely cutting a pre-crack 6 at the back of the angle steel to be dismantled; using data of two edges of the blasting demolition angle steel 2 as length and width to manufacture a plastic cuboid cylindrical mold, wherein the bottom of the mold is sealed, and only the upper end of the mold is open; welding embedded PVC5 with the same length as the cylindrical mold at the bottom of the plastic cuboid cylindrical mold 14, coinciding the central axis of the PVC pipe 5 with the plastic cuboid cylindrical mold 14, erecting the plastic cuboid cylindrical mold 14, filling an aqueous medium between the inner wall of the plastic cuboid cylindrical mold 14 and the outer wall of the embedded PVC pipe 5 along the upper end opening until the aqueous medium is filled in the space between the inner wall of the plastic cuboid cylindrical mold 14 and the outer wall of the embedded PVC pipe 5, and keeping the mold and the embedded PVC pipe 5 in a vertical state all the time; eighthly, hot-melting and sealing the inner wall of the mold filled with the aqueous medium and the outer wall of the PVC pipe 5 by using a plastic plate 16 at the opening of the plastic cuboid cylindrical mold 14; filling stemming to the bottom of the embedded PVC pipe 5 along the pipe orifice of the PVC pipe 5, filling explosive packages along the upper end opening of the embedded PVC pipe 5 according to the designed dosage, and then using stemming 15 to block the pipe orifice of the PVC pipe to obtain a prefabricated water medium charging module; and packing the prefabricated aqueous medium charging module into the hollow cylindrical steel beam, and detonating after preparation works before blasting, such as warning, protection and the like are finished.

(8) An angle iron blasting demolition method of an eccentric charging solid filling integral module, as shown in figure 11

Firstly, making an auxiliary angle steel 1 which is the same as the angle steel 2 to be demolished by blasting; secondly, horizontally placing the auxiliary angle steel 1 on the ground, and packaging the side edges and the upper and lower openings of the angle steel into a u-shaped groove die with a rectangular cross section by using three baffles; embedding a pre-embedded PVC pipe 5 with a back cover at the right angle position in the angle steel and close to the edge of the angle steel, wherein the back cover of the PVC5 pipe is positioned in the angle steel, and the opening of the PVC pipe 5 is flush with the top of the angle steel; pouring concrete into the u-shaped groove die, covering the PVC pipe, and then continuing pouring concrete into the u-shaped groove die until the height of the concrete is the same as the height of the opening of the u-shaped groove after the settlement is finished; curing the poured concrete, demolding after curing is finished, opening a u-shaped groove mold to remove three boards and mold angle steel, and obtaining an integrally-assembled prefabricated eccentric module consisting of the concrete and the PVC pipe; fourthly, transversely cutting a pre-crack 6 of the angle steel to be dismantled close to the back of the right angle; fifthly, mounting the integrally assembled prefabricated eccentric module on the angle steel to be dismantled; fixing the integrally assembled prefabricated eccentric module on the angle steel to be dismantled by using die angle steel, filling a explosive package 4 along the pre-buried PVC pipe, and blocking the opening of the PVC pipe by using stemming; and protection, warning and other preparation before blasting can be initiated.

(9) An angle steel blasting demolition method of an eccentric charging solid filling split module, as shown in fig. 12

Firstly, making an auxiliary angle steel 1 which is the same as the angle steel 2 to be demolished by blasting; welding the long side of the auxiliary angle steel 1 and the angle steel 2 to be demolished by blasting to form a hollow cylindrical steel beam with a rectangular section; the bottom of the hollow cylindrical steel beam is welded in a seamless mode through a steel plate 3 made of the same material as the angle steel; fourthly, manufacturing a plastic cuboid box-shaped mould by taking the data of two edges of the blasting demolition angle steel 2 as the length and the width, wherein the bottom of the box-shaped mould is sealed, and only the upper end of the box-shaped mould is open; placing the rectangular box-shaped mould on a horizontal ground, and vertically fixing and placing a suction pipe 13 along the inner wall of the mould; pouring concrete along the opening at the upper end of the mould to keep the inner cavity of the suction pipe 13 free of concrete; after the concrete is poured to a certain height, vertically embedding a reserved PVC pipe 5 at a right angle of the rectangular mould after the concrete naturally settles, clinging to the inner wall of the mould, inserting the reserved PVC pipe into the poured concrete, wherein the length of the reserved PVC pipe is 1 cm; sixthly, continuously pouring concrete between the outer wall of the PVC pipe and the inner wall of the cuboid-shaped mould until the concrete naturally settles to be flush with the opening at the upper end of the cuboid-shaped mould; seventhly, curing the poured concrete, and demolding after curing is finished to obtain an eccentric split assembly type prefabricated module 11; preparing two same eccentric split assembled prefabricated modules 11 according to the method, filling 2# rock emulsion explosive and detonating tube detonators 12 into the three split assembled charging modules along the reserved PVC pipe 5, and then plugging the three split assembled charging modules to the opening of the PVC pipe along the reserved PVC pipe 5 by using stemming to obtain three split assembled charged eccentric modules which are named as No. I, No. II and No. III split assembled charged eccentric modules respectively. Pre-cracks are cut in the hollow cylindrical steel beam in the transverse direction; filling stemming into the welded bottom of the hollow cylindrical steel beam from the opening, filling a No. I split assembly type filled module after compaction, and keeping the embedded PVC pipe to be attached to the right-angle side in the angle steel to be dismantled; then, continuously filling stemming into the hollow cylindrical steel beam along the opening to the top of the No. I split assembly type charged module, pulling out the detonating tube in the No. I split assembly type charged module, enabling the detonating tube to pass through a reserved suction pipe opening in the No. II split assembly type charged module, and then putting the No. II split assembly type charged module; filling stemming into the hollow cylindrical steel beam along the opening to the top of the II # split assembled charged module, pulling out the detonating tube in the II # split assembled charged module and the detonating tube in the I # split assembled charged module which passes through the 13-port reserved suction tube in the II # split assembled charged module, enabling the two detonating tubes to pass through the 13-port reserved suction tube in the III # split assembled charged module, and then putting the III # split assembled charged module into the III # split assembled module; filling stemming into the hollow cylindrical steel beam along the opening to reach the upper orifice of the hollow cylindrical steel beam; three detonating tubes in the three split assembled charged modules are grabbed into one beam, and detonation can be carried out after preparation work before blasting, such as warning, protection and the like, is finished.

Claims

1. A method for demolishing and danger removing through blasting of a single tower of a power transmission tower with an angle steel structure is characterized by comprising the following steps:

step 1: determining the dismantling range, and determining whether the transmission line on the upper part of the transmission tower and other transmission towers need to be protected;

and step 3: determining the pouring direction: according to the instability condition of the power transmission tower, taking the direction of gravity center deviation as the toppling direction;

H=（0.8~1.7）R

in the formula:His fried high, unit is meter (m);

Rfor equivalent radius of projection of the support surface, R = (S/π)^1/2R is in meters (m);

Sthe projected area of the supporting surface is a square meter;

and 5: performing incision treatment;

step 6: installing a medicine bag;

and 7: safety protection;

and 8: networking and detonating.

2. The method for demolishing and eliminating risks by blasting the single tower of the transmission tower with the angle steel structure according to claim 1, wherein the explosive package is installed in the step 6 by adopting a center-charge punching-free solid-state filling angle steel structure blasting demolition method, and the method comprises the following steps:

thirdly, transversely cutting a pre-crack at the back of the angle steel to be demolished by blasting;

3. The method for demolishing and eliminating risks by blasting the single tower of the transmission tower with the angle steel structure according to claim 1, wherein the explosive package is installed in the step 6 by filling the angle steel structure with a non-perforated explosive charge, and the method comprises the following steps:

firstly, selecting a welding angle steel with the same size as the shape of the angle steel to be blasted and the length of 1.5 m;

cutting 16 cutting seams with the length of 2cm on the two side surfaces of the angle steel to be blasted and the welding angle steel every 10cm from the position of 40cm, and sealing the welding seams by using glue;

seventhly, filling water into the welding cylinder and the PVC pipe;

4. The method for demolishing and eliminating risks by blasting the single tower of the transmission tower with the angle steel structure according to claim 1, wherein the blasting method for demolishing the angle steel structure by blasting is characterized in that the blasting method for demolishing the angle steel structure by installing the blasting cartridges in the step 6 is a center-charge punching-free granular filling angle steel structure, and comprises the following steps:

5. The method for demolishing and danger eliminating by blasting the single tower of the transmission tower with the angle steel structure according to claim 1, wherein the explosive package is installed in the step 6 by adopting a blasting demolition method of the angle steel with a center-charged solid-filled integral module, and the method comprises the following steps:

horizontally placing the die angle steel on the ground, and packaging the side edge and the bottom of the die angle steel into a u-shaped groove die by using three boards; pouring concrete into the u-shaped groove mould, after the concrete reaches a certain height, putting a bottom-sealed pre-buried PVC pipe on the concrete, wherein the PVC pipe seal is positioned in the mould angle steel, and the opening of the PVC pipe is slightly longer than the mould angle steel; continuously pouring concrete into the u-shaped groove die until the height of the concrete after settlement is the same as the vertical edge of the angle steel of the die;

fourthly, transversely cutting the pre-cracks at the back of the angle steel to be demolished by blasting;

fixing the integrally assembled prefabricated module on the angle steel to be blasted and demolished;

6. The method for demolishing and danger eliminating by blasting the single tower of the angle steel structure power transmission tower according to claim 1, wherein the explosive package is installed in the step 6 by adopting a center-charge solid-state filling split module angle steel blasting demolition method, comprising the following steps:

thirdly, seamlessly welding the bottom of the hollow cylindrical steel beam by using a steel plate which is made of the same material as the angle steel to be demolished by blasting and the attached angle steel;

fourthly, manufacturing a plastic cuboid box-shaped mould by taking the data of two edges of the angle steel to be demolished by blasting as length and width, wherein the bottom of the box-shaped mould is sealed, and only the upper end of the box-shaped mould is open;

placing the cuboid box-shaped mould on a horizontal ground, and vertically fixing and placing a straw along the inner wall of the mould; pouring concrete along the opening at the upper end of the mould to keep the inner cavity of the suction pipe free of concrete; after pouring to a certain height, vertically embedding a reserved PVC pipe in the center of the cuboid box-shaped mould and on the poured concrete after the concrete naturally settles, wherein the reserved PVC pipe is inserted into the poured concrete by 1 cm;

pouring concrete continuously along the space between the outer wall of the PVC pipe and the inner wall of the cuboid box-shaped mould until the concrete naturally settles to be flush with the opening at the upper end of the cuboid box-shaped mould;

preparing two same split assembly type prefabricated modules according to the method, filling 2# rock emulsion explosive and detonating tube detonators into the three split assembly type prefabricated modules along a reserved PVC pipe, and plugging the reserved PVC pipe with stemming to the opening of the PVC pipe to obtain three split assembly type charged modules which are named as No. I, No. II and No. III split assembly type charged modules respectively; pre-cracks are cut in the hollow cylindrical steel beam in the transverse direction;

7. The method for demolishing and danger eliminating by blasting the single tower of the transmission tower with the angle steel structure according to claim 1, wherein the blasting method for demolishing the angle steel by filling the whole module with the center-filled granular material is adopted in the step 6, and comprises the following steps:

thirdly, seamlessly welding the bottom of the hollow cylindrical steel beam by using a steel plate which is made of the same material as the angle steel to be blasted and the welding angle steel;

using the data of two edges of the angle steel to be demolished by blasting as length and width to manufacture a plastic cuboid cylindrical mold, wherein the bottom of the cuboid cylindrical mold is sealed, and only the upper end of the cuboid cylindrical mold is open;

erecting a plastic cuboid cylindrical mould, filling a particle medium into the mould along an upper end opening, after the particle medium is filled to a certain height, pre-burying a pre-buried PVC pipe with the length slightly higher than the upper end opening into the middle of the mould after the particle medium is naturally settled, continuously filling the particle medium between the outer wall of the pre-buried PVC pipe and the inner wall of the mould until the particle medium is slightly lower than the upper end opening height of the mould after the particle medium is naturally settled, and keeping the mould and the pre-buried PVC pipe in a vertical state all the time;

8. The method for demolishing and danger eliminating by blasting the single tower of the angle steel structure power transmission tower according to claim 1, wherein the explosive package is installed in the step 6 by filling the angle steel of the split module with a center-charged fluid state, and the method comprises the following steps:

using data of two edges of the angle steel to be demolished by blasting as length and width to manufacture a plastic cuboid cylindrical mold, wherein the bottom of the cuboid cylindrical mold is sealed, and only the upper end of the cuboid cylindrical mold is open;

9. The method for demolishing and danger eliminating by blasting the single tower of the transmission tower with the angle steel structure according to claim 1, wherein the explosive package is installed in the step 6 by adopting an eccentric-charging solid-filling integral module angle steel blasting demolition method, and the method comprises the following steps:

horizontally placing the die angle steel on the ground, and packaging the side edges and the upper and lower openings of the angle steel into a u-shaped groove die with a rectangular cross section by using three boards; embedding a bottom-sealed embedded PVC pipe at the right angle in the die angle steel close to the edge of the die angle steel, wherein the PVC pipe bottom seal is positioned in the die angle steel, and the opening of the PVC pipe is flush with the top of the die angle steel; pouring concrete into the u-shaped groove die, covering the PVC pipe, and then continuing pouring concrete into the u-shaped groove die until the height of the concrete is the same as the height of the opening of the u-shaped groove after the settlement is finished;

curing the poured concrete, demolding after curing is finished, opening a u-shaped groove mold to remove three boards and mold angle steel, and obtaining an integrally-assembled prefabricated eccentric module consisting of the concrete and the PVC pipe;

fourthly, transversely cutting the pre-cracks on the angle steel to be demolished by blasting, wherein the angle steel is close to the back of the right angle;

installing the integrally assembled prefabricated eccentric module on the angle steel to be blasted and dismantled; fixing the integrally assembled prefabricated eccentric module to the angle steel to be blasted and demolished by using the die angle steel;

10. The method for demolishing and danger eliminating by blasting the single tower of the transmission tower with the angle steel structure according to claim 1, wherein the explosive package is installed in the step 6 by adopting an eccentric-charging solid-filling split-module angle steel blasting demolition method, and the method comprises the following steps:

placing the cuboid box-shaped mould on a horizontal ground, and vertically fixing and placing a straw along the inner wall of the mould; pouring concrete along the opening at the upper end of the mould to keep the inner cavity of the suction pipe free of concrete; after pouring to a certain height, vertically embedding a reserved PVC pipe in a right angle of the cuboid box-shaped mould to be tightly attached to the inner wall of the mould after the concrete naturally settles, inserting the reserved PVC pipe into the poured concrete, wherein the length of the reserved PVC pipe is 1 cm;

preparing two same split assembled prefabricated eccentric modules according to the method, filling 2# rock emulsion explosive and detonating tube detonators into the three split assembled prefabricated eccentric modules along the reserved PVC pipe, and plugging the three split assembled prefabricated eccentric modules to the pipe orifice of the PVC pipe along the reserved PVC pipe by using stemming to obtain three split assembled loaded eccentric modules which are named as No. I, No. II and No. III split assembled loaded eccentric modules respectively; pre-cracks are cut in the hollow cylindrical steel beam in the transverse direction;

filling stemming into the welded bottom of the hollow cylindrical steel beam from the opening, filling a No. I split assembly type filled eccentric module after compaction, and keeping the pre-buried PVC pipe to be attached to the right-angle side in the angle iron to be demolished; then, continuously filling stemming into the hollow cylindrical steel beam along the opening to the top of the No. I split assembled loaded eccentric module, pulling out the detonating tube in the No. I split assembled loaded eccentric module, enabling the detonating tube to pass through a suction pipe opening reserved in the No. II split assembled loaded eccentric module, and then putting the No. II split assembled loaded eccentric module; filling stemming into the hollow cylindrical steel beam along the opening at the top of the split assembled eccentric module with powder charge II, pulling out the detonating tube in the split assembled eccentric module with powder charge II and the detonating tube in the split assembled eccentric module with powder charge I which passes through the suction tube opening reserved in the split assembled eccentric module with powder charge II, allowing the two detonating tubes to pass through the suction tube opening reserved in the split assembled eccentric module with powder charge III, and then putting the split assembled eccentric module with powder charge III into the hollow cylindrical steel beam; filling stemming into the hollow cylindrical steel beam along the opening to reach the upper orifice of the hollow cylindrical steel beam; three detonating tubes in the three split assembled charged eccentric modules are grabbed into one bundle.