Fracture hole charging device, underground structure demolition system and method

Abstract

The application discloses an inflation-crack hole charging device, an underground structure breaking system and method, and relates to the technical field of underground engineering and underground space expansion and breaking construction, and comprises an inflation-crack cartridge, a mounting rod and a sealing plug, wherein the inflation-crack cartridge comprises an outer packaging bag and an inflation-crack agent; the outer packaging bag is of a closed structure, and the inflation-crack agent is filled in the outer packaging bag; one end of the mounting rod is used for fixed connection with one end of the outer packaging bag to guide one end of the inflation-crack cartridge into the bottom of the inflation-crack hole, and the mounting rod can cut the end of the outer packaging bag extending into the bottom of the inflation-crack hole to make the inflation-crack agent flow from the outer packaging bag into the inflation-crack hole; and the sealing plug is used for sealing the inflation-crack hole filled and compacted with the inflation-crack agent; the device is simple in structure, convenient to operate, can drive the inflation-crack cartridge into the bottom of the drill hole, effectively fills the inflation-crack hole, avoids the constraint of the outer packaging on the inflation of the inflation-crack agent, and effectively improves the rock breaking effect.

Description

Technical Field

[0001] This invention relates to the field of underground engineering and underground space expansion and demolition construction technology, and in particular to a rupture hole charging device, an underground structure demolition system and method. Background Technology

[0002] With the rapid development of urban underground space in my country, the number of subway lines is increasing daily. When adding a new line to an existing subway station, it is necessary to demolish the portal of the existing subway station to connect the tunnel and the subway station; when expanding the main structure of a station, it is necessary to demolish the side walls for expansion; the launching and receiving of tunnel boring machines generally require passing through reinforced concrete diaphragm walls, which requires the pre-demolition of the portal locations. Most of the structures involved in the above-mentioned renovations, expansions, and demolitions are reinforced concrete structures.

[0003] Currently, the main methods for demolishing such underground concrete structures include:

[0004] 1. Hydraulic wire saw cutting begins with drilling holes using a water drill to allow the chain to pass through. Expansion bolts are then installed at appropriate locations to secure the cutting machine to the guide wheels. The diamond wire, driven by a hydraulic motor, then moves at high speed around the cutting surface to grind the material. The resulting dust is carried away by cooling water, ultimately forming the cut surface. The cut concrete block is then removed by hoisting equipment.

[0005] 2. Demolition by blasting: Drilling rigs are used to make holes, explosives are placed inside the holes, reasonable blasting parameters are selected, and a detailed blasting plan is formulated. Within a certain range, the concrete is shattered by blasting to achieve the purpose of demolition.

[0006] 3. Static expansive cracking agent rock breaking: Static expansive cracking agent is a new type of rock breaking material composed of hydrated expansive substances, hydraulic substances and water-reducing agents. Its main component is calcium oxide. Its rock breaking principle is that calcium oxide reacts with water to release heat and is accompanied by volume expansion. The sum of volume expansion and thermal expansion is greater than the borehole volume, generating expansion pressure, thereby cracking the concrete structure.

[0007] The demolition of underground structures needs to take into account the impact on the surrounding site. When there are important buildings nearby, the blasting method will be limited in many ways, such as producing a series of harmful effects: blasting vibration, collapse vibration, blasting debris, secondary spatter, blasting dust, air shock waves and noise, etc.

[0008] The demolition of underground structures must also take into account the impact of construction space. In a narrow underground space, hydraulic wire saw cutting will be subject to certain constraints. Even if it can be cut successfully, hoisting concrete blocks in a small underground space is also a major problem.

[0009] Static fracturing agents offer high safety during construction, eliminating the risk of explosions, flying rocks, or other dangerous accidents, and minimizing disruption to surrounding buildings, pedestrians, and residents' daily lives. However, the injection of static fracturing agents presents several challenges. Traditional grouting equipment, after prolonged operation, risks clogging the grout pump and pipelines due to slurry solidification. Cleaning grouting equipment in underground spaces is also difficult, hindering the widespread use of static fracturing agents in challenging environments such as subway tunnels. When fracturing in horizontal boreholes, fracturing agents are typically filled in cartridge form to prevent leakage. However, fracturing cartridges are fluid-like, and especially in deep holes, their deformation during insertion can clog the borehole, preventing complete coverage and impacting the rock-breaking effect.

[0010] Chinese patent CN108801088A discloses a rock-breaking method using a static expansive agent in the form of a roll. The process involves placing static expansive agent powder into a cylindrical non-woven bag, saturating the roll in water to activate the hydration reaction, inserting the roll into a drill hole using a bakelite jack, and finally sealing the hole. Its shortcomings are: ① Soaking the roll to saturation cannot guarantee the optimal water-cement ratio every time, and the surface of the roll may absorb more water than the interior, failing to fully utilize the expansive agent's expansive effect. ② The non-woven fabric is made of polyester fiber, which is strong and tough. Using it to wrap the static expansive agent creates constraint during the expansion process, thus reducing the rock-breaking effect. Summary of the Invention

[0011] The purpose of this invention is to provide a fracturing hole charging device, an underground structure demolition system and method to solve the problems existing in the prior art. It has a simple structure and is easy to operate. It can drive the fracturing explosive cartridge into the bottom of the borehole, effectively fill the fracturing hole, avoid the outer packaging from restricting the expansion of the fracturing agent, and effectively improve the rock breaking effect.

[0012] To achieve the above objectives, the present invention provides the following solution:

[0013] This invention provides a rupture-hole charging device, comprising: a rupture-hole charge cartridge, a mounting rod, and a sealing plug.

[0014] The expandable drug roll includes an outer packaging bag and an expandable agent. The outer packaging bag is a closed structure, and the expandable agent is filled inside the outer packaging bag. One end of the mounting rod is used to connect to one end of the outer packaging bag to guide one end of the expandable drug roll into the bottom of the expandable hole. The mounting rod is also movable relative to the expandable drug roll to cut open the end of the outer packaging bag that extends into the bottom of the expandable hole, allowing the expandable agent to flow from the outer packaging bag into the expandable hole. The sealing plug is used to seal the expandable hole, which is filled with and compacted by the expandable agent.

[0015] Preferably, the expandable drug roll has an inner end seal and an outer end seal, and the outer packaging bag is a plastic packaging bag. The inner end seal and the outer end seal can be sealed after the expandable agent is filled into the plastic packaging bag.

[0016] Preferably, the diameter of the expansion cartridge is 0.9 times the diameter of the expansion hole, the length of the expansion cartridge is greater than the depth of the expansion hole, and the expansion agent is a fluidized plastic form formed by mixing expansion agent powder and water in a certain proportion.

[0017] Preferably, it also includes a traction line. The mounting rod includes a mounting rod body, a mounting rod tail cutter, and a mounting rod handle. The mounting rod body has a first end and a second end. The first end is used to extend into the expansion hole. The mounting rod tail cutter is integrally fixed to the first end. The mounting rod handle is fixedly fixed to the second end. The first end is provided with a lead wire hole. One end of the traction line is used to be fixedly connected to the inner end seal, and the other end passes through the lead wire hole and is connected to the mounting rod handle. The sealing plug is a rubber plug.

[0018] The present invention also provides an underground structure demolition system, comprising: a plurality of isolation holes and a plurality of expansion holes, wherein each isolation hole is arranged on the outline of the demolition opening to isolate the demolition opening from the concrete wall; each expansion hole is arranged in the outline area of ​​the demolition opening, and the expansion hole is filled with the expansion agent to break the concrete of the demolition opening.

[0019] Preferably, each of the expansion holes is filled with the expansion agent filled using the expansion hole loading device as described in any one of claims 1 to 4.

[0020] Preferably, any two adjacent isolation holes partially overlap, the diameter of the isolation hole is 80-100cm, the depth of the isolation hole is 0.9 times the wall thickness of the through hole, the diameter of the expansion hole is 40-50mm, and the depth of the expansion hole is 0.95 times the wall thickness of the through hole.

[0021] Preferably, when the cross-sectional shape of the breach is rectangular, the expansion holes are arranged in a rectangular array, the vertical spacing between the expansion holes is 400-500mm, and the horizontal spacing between the expansion holes is 300-400mm.

[0022] Preferably, when the cross-sectional shape of the breach is circular, the expansion holes are arranged in a circular array, the radius difference between adjacent array circles is 400-500mm, and the arc distance between adjacent expansion holes on one array circle is 300-400mm.

[0023] This invention also provides a method for demolishing underground structures, comprising the following steps:

[0024] Multiple isolation holes are made along the outline of the breach opening, and expansion holes are arranged on the breach opening.

[0025] The expansion hole filling device as described in any one of claims 1 to 4 is used to fill each of the expansion holes with the expansion agent and then expand and expand them.

[0026] The present invention achieves the following technical effects compared to the prior art:

[0027] The purpose of this invention is to provide a fracturing hole loading device, an underground structure demolition system, and a method. The fracturing agent is placed in an outer packaging bag, and the fracturing agent roll is dragged into the fracturing hole using an installation rod. This method eliminates the need for traditional grouting pumps, making it simpler and more suitable for underground construction. Furthermore, extending the end of the fracturing agent roll to the bottom of the fracturing hole using the installation rod effectively solves the problem of hole blockage, ensuring the hole is fully filled. Cutting open the end of the outer packaging bag with the installation rod releases the fracturing agent to fill the hole, thus solving the problem of reduced rock-breaking effect due to the outer packaging restricting the expansion of the fracturing agent, effectively improving the rock-breaking effect.

[0028] Furthermore, isolation holes are set along the outline of the breach opening. These isolation holes effectively control the breaching range of the expansion explosive cartridge, essentially eliminating disturbance to the surrounding environment and effectively preventing damage to the surrounding structure, thus achieving non-destructive breaching. In addition, the arrangement of the isolation holes provides an open surface for the static expansion explosive, which is conducive to structural expansion and ensures that it proceeds in the designed breaching sequence. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A cross-sectional view of the structure of the slit-hole charging device provided by the present invention in use;

[0031] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0032] Figure 3 A schematic diagram of the structure after the expansion joint grouting is completed;

[0033] Figure 4 A cross-sectional view of the underground structure demolition system provided by this invention when the demolition opening is rectangular;

[0034] Figure 5 A cross-sectional view of the underground structure demolition system provided by the present invention when the demolition opening is circular;

[0035] Figure 6 A schematic diagram of the construction sequence of the underground structure demolition system provided by this invention when the demolition opening is circular;

[0036] In the diagram: 1. Demolition opening; 2. Expansion hole; 3. Expansion cartridge; 4. Traction line; 5. Mounting rod handle; 6. Mounting rod body; 7. Lead wire hole; 8. Mounting rod tail cutter; 9. Inner end seal; 10. Outer end seal; 11. Isolation hole; 12. Rubber plug; 13. Outline of the demolition opening; 14. Concrete wall. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] The purpose of this invention is to provide a fracturing hole charging device, an underground structure demolition system and method to solve the problems existing in the prior art. It has a simple structure and is easy to operate. It can drive the fracturing explosive cartridge into the bottom of the borehole, effectively fill the fracturing hole, avoid the outer packaging from restricting the expansion of the fracturing agent, and effectively improve the rock breaking effect.

[0039] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Example 1

[0041] This embodiment provides a device for loading explosives through a slit hole, such as... Figures 1-3As shown, the device includes: a ruptureable drug roll 3, an mounting rod, and a sealing plug. The ruptureable drug roll 3 includes an outer packaging bag and a rupture agent. The outer packaging bag has a closed structure, and the rupture agent is filled inside the outer packaging bag. One end of the mounting rod is used to fix one end of the outer packaging bag to guide one end of the ruptureable drug roll 3 into the bottom of the rupture hole 2. The mounting rod can also cut open the end of the outer packaging bag that extends into the bottom of the rupture hole 2 to allow the rupture agent to flow from the outer packaging bag into the rupture hole 2. The sealing plug is used to seal the rupture hole 2, which is filled with and compacted with the rupture agent, thus preventing the rupture from spreading. The agent is placed in the outer packaging bag. The expansion agent roll 3 is dragged into the expansion hole 2 by the installation rod. This method abandons the traditional grouting pump injection and is simpler and more suitable for construction in underground spaces. The installation rod extends the end of the expansion agent roll 3 to the bottom of the expansion hole 2, which can effectively solve the problem of hole blockage and effectively fill the expansion hole 2. The installation rod is used to cut open the end of the outer packaging bag to release the expansion agent to fill the expansion hole 2. This solves the problem of the expansion agent expansion being restricted by the outer packaging, which reduces the rock breaking effect and effectively improves the rock breaking effect.

[0042] In a preferred embodiment, the expansion agent roll 3 further includes an inner end seal 9 and an outer end seal 10. The outer packaging bag is a plastic packaging bag. The inner end seal 9 and the outer end seal 10 are used to seal the plastic packaging bag filled with expansion agent. The structure is simple. The expansion agent roll 3 is made on the construction site. One end of the plastic packaging bag of the expansion agent roll 3 is tied and the other end is left open. The expansion agent powder is mixed with an appropriate amount of water according to the optimal water-cement ratio. The expansion agent after mixing is filled into the expansion agent roll 3 with a funnel, and then the roll is tied by wrapping it with a thin cotton rope several times.

[0043] In a preferred embodiment, the diameter of the rupture cartridge 3 is 0.9 times the diameter of the rupture hole 2, and the length of the rupture cartridge 3 is greater than the depth of the rupture hole 2.

[0044] In a preferred embodiment, the mounting rod includes a mounting rod body 6, a mounting rod tail cutter 8, a mounting rod handle 5, a traction line 4, and a lead wire hole 7. The mounting rod body 6 has a first end and a second end. The first end is used to extend into the expansion hole 2. The mounting rod tail cutter 8 is integrally fixedly disposed at the first end. The mounting rod handle 5 is fixedly disposed at the second end. The first end is disposed at the lead wire hole 7. One end of the traction line 4 is fixedly connected to the inner end seal 9, and the other end passes through the lead wire hole 7 and is fixedly connected to the mounting rod handle 5. The tail cutter 8, the mounting rod body 6, and the lead wire hole 7 are integrally formed and forged in the factory. The mounting rod handle 5 is welded to the mounting rod body 6. The traction rope is made of 1mm high-strength nylon wire and is 1.5 times the length of the expansion hole 2. When filling the expansion cartridge 3, the traction line 4 is passed through the lead wire hole 7 at the upper end of the tail cutter 8 and connected to the end of the expansion cartridge 3 hole. The other end is tied to the mounting rod handle 5. The shape of the expansion cartridge 3 is adjusted to be parallel to the mounting rod body 6, and the traction line 4 is tightened. Under the linkage of the traction line 4, the expansion cartridge 3 is fed into the drill hole, and the installation of the expansion cartridge 3 is completed. To ensure the rock-breaking effect of the fracturing agent is better, it needs to be released from the plastic packaging bag: pull the cutting blade 8 at the end of the installation rod to cut the plastic packaging bag. When the cutting blade reaches 1 / 4 of the bottom of the fracturing hole 2, pinch the outer end of the fracturing agent roll 3 and squeeze the fracturing agent into the borehole. After the fracturing agent fills the borehole, hold the handle 5 of the installation rod and pull the filling device out of the borehole. Finally, seal the hole with the rubber stopper 12.

[0045] In a preferred embodiment, the sealing plug is a rubber plug 12, which has an upper diameter of 56mm, a lower diameter of 38mm, and a height of 40mm, and is made of rubber material.

[0046] Example 2

[0047] This embodiment also provides an underground structure demolition system, such as Figures 4-5 As shown, it includes: multiple isolation holes 11, multiple expansion holes 2, and an expansion hole 2 charging device as in Embodiment 1. Each isolation hole 11 is arranged on the outline of the demolition opening to isolate the demolition opening 1 from the concrete wall 14; the expansion holes 2 are used to fill the expansion hole 1 with expansion agent to break the concrete of the demolition opening 1; the expansion hole 2 charging device is used to fill the expansion hole 2 with expansion agent. Furthermore, the isolation holes 11 are set on the outline of the demolition opening. The isolation holes 11 effectively control the demolition range of the expansion explosive cartridge 3, which can basically eliminate the disturbance to the surrounding environment, effectively prevent damage to the surrounding structure, and achieve non-destructive demolition. Moreover, the arrangement of the isolation holes 11 provides an open surface for the static expansion agent, which is conducive to structural expansion and cracking, and can also ensure that it is carried out in accordance with the designed demolition sequence.

[0048] In a preferred embodiment, the diameters of two adjacent isolation holes interlock by 20%, the diameter of the isolation hole 11 is 80-100cm, the depth of the isolation hole 11 is 0.9 times the wall thickness of the through hole, the diameter of the expansion hole 2 is 40-50mm, and the depth of the expansion hole 2 is 0.95 times the wall thickness of the through hole. The structure is simple, and the arrangement of the isolation holes 11 provides an open surface for the static expansion agent, which is beneficial to the expansion and cracking of the structure.

[0049] In a preferred embodiment, when the cross-sectional shape of the breach opening 1 is rectangular, the expansion holes 2 are arranged in a rectangular array, the vertical spacing of the expansion holes 2 is 400-500mm, and the horizontal spacing of the expansion holes 2 is 300-400mm.

[0050] In a preferred embodiment, when the cross-sectional shape of the breach opening 1 is circular, the expansion holes 2 are arranged in a circular array, the radius difference between adjacent array circles is 400-500mm, and the arc distance between adjacent expansion holes 2 on an array circle is 300-400mm.

[0051] Example 3

[0052] This invention also provides a method for demolishing underground structures, comprising the following steps:

[0053] Isolation holes 11 are made along the outline of the demolition opening, and expansion holes 2 are arranged on the demolition opening 1.

[0054] A. Rectangular Demolition Opening 1: The dimensions of the rectangular demolition opening are B×H×T (width×height×thickness). The centers of isolation holes 11 are arranged on the opening outline with an interlocking diameter of 20%. Isolation hole 11 diameter D = 80–100 mm, hole depth 0.9T (T is wall thickness). Expansion hole 2 diameter d = 40–50 mm, hole depth 0.95T. Expansion hole 2 row spacing Y = 400–500 mm, hole spacing X = 300–400 mm. The values ​​of X and Y can be varied according to the uniaxial compressive strength of the wall being demolished. For walls with high uniaxial compressive strength, both row spacing and hole spacing can be reduced; conversely, the spacing can be appropriately increased.

[0055] b. Circular Demolition Opening 1: The diameter of the circular demolition opening is Φ. Isolation holes 11 are arranged along the circular outline of the opening, with their centers interlocking by 20% of their diameters. Isolation hole 11 has a diameter D = 80–100 mm and a depth of 0.9T (T is the wall thickness). Expansion crack holes 2 are arranged in a circular array. Expansion crack holes 2 have a diameter d = 40–50 mm and a depth of 0.95T. The radius difference between adjacent array circles is E = 400–500 mm, and the arc distance between array holes is an = 300–400 mm.

[0056] The expansion agent is installed in each expansion hole 2 and expansion is performed. The specific method for loading the agent into expansion holes 2 is as follows:

[0057] Tie the opening and secure the outer packaging bag filled with the expansion agent to ensure it is sealed and leak-proof.

[0058] Connect one end of the traction line 4 to the inner end seal 9 of the medicine cartridge hole, and the other end passes through the lead wire hole 7 and is tied to the handle 5 of the mounting rod.

[0059] Insert the expansion explosive cartridge 3 into the hole. Place the inner end seal 9 of the expansion explosive cartridge 3 close to the cutting tool 8 at the end of the mounting rod. Hold the expansion explosive cartridge 3 with your hand, keeping it parallel to the mounting rod, while ensuring the traction rope remains taut. Grasp the handle 5 of the mounting rod and slowly feed the expansion explosive cartridge 3 into the drill hole until it reaches the bottom of the expansion hole 2.

[0060] Release the expansion agent, pull out the cutting blade 8 of the mounting rod at the bottom of the expansion hole 2, and when the blade cuts the expansion drug roll 3 to 1 / 4 of the bottom of the expansion hole 2, hold the outer end seal 10 of the expansion drug roll 3 and squeeze the expansion agent into the expansion hole 2, so that the expansion agent flows out from the outer packaging bag.

[0061] When the expansion agent fills the drilled hole, pull the handle 5 of the installation rod to simultaneously pull the installation rod and the outer packaging bag away from the expansion hole 2.

[0062] After compaction, seal the hole with a rubber stopper 12.

[0063] Dismantling sequence

[0064] a. Demolition sequence of rectangular opening

[0065] After the expansion holes 2 and isolation holes 11 are drilled, the holes are installed in rows according to the expansion sequence from bottom to top. Ten hours after the bottom row of holes is loaded, the second to last row of holes is loaded, and so on, until all M rows of holes are loaded.

[0066] b. Dismantling sequence of the circular opening

[0067] The expansion and cracking process of the circular breach opening 1: Divide the n array circles into 2n semicircles. The expansion holes 2 passed through by the semicircular arcs with different linear proportions represent different expansion and cracking sequences. The breaching is carried out according to the expansion and cracking sequence (S1-S6) from small to large linear proportions and from bottom to top. When there are fewer expansion holes 2 at the center and on the innermost array circle, expansion and cracking can be carried out simultaneously, that is, expansion and cracking sequences 3 and 4 can be carried out simultaneously. The time interval for loading the expansion and cracking cartridge 3 is also 10 hours. Figure 6 As shown.

[0068] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A split shot charge device characterized by: The expansion cracking cartridge comprises an outer packaging bag and an expansion cracking agent, the outer packaging bag is a closed structure, the expansion cracking agent is filled in the outer packaging bag, the expansion cracking cartridge has an inner end seal and an outer end seal; The installation rod comprises a rod body, a rod tail cutter and a rod handle, the rod body has a first end and a second end, the first end is used to extend into the expansion cracking hole, the rod tail cutter is fixedly arranged at the first end, the rod handle is fixedly arranged at the second end, the first end of the installation rod is used to be connected with one end of the outer packaging bag to guide one end of the expansion cracking cartridge into the bottom of the expansion cracking hole, and the installation rod can move relative to the expansion cracking cartridge to cut the end of the outer packaging bag extending into the bottom of the expansion cracking hole to make the expansion cracking agent flow from the outer packaging bag into the expansion cracking hole; The sealing plug is used to seal the expansion cracking hole filled with and compacted with the expansion cracking agent; and The first end of the rod body is provided with a lead hole, one end of the traction line is fixedly connected with the inner end seal, and the other end passes through the lead hole and is connected with the rod handle. The outer packaging bag is a plastic packaging bag, and the inner end seal and the outer end seal can be closed after the plastic packaging bag is filled with the expansion cracking agent.

2. The split shot charge device of claim 1, wherein: The diameter of the expansion cracking cartridge is 0.9 times the diameter of the expansion cracking hole, the length of the expansion cracking cartridge is greater than the hole depth of the expansion cracking hole, and the expansion cracking agent is a flowable state formed by stirring the expansion cracking agent powder and water in a certain proportion.

3. The split shot charge device of claim 2, wherein: The sealing plug is a rubber plug.

4. The split shot charge device of claim 3, wherein: The expansion cracking cartridge charging device comprises:

5. An underground structure demolition system characterized by: A plurality of isolation holes, each of the isolation holes is arranged on the contour line of the breaking hole to isolate the breaking hole from the concrete wall; and A plurality of expansion cracking holes, each of the expansion cracking holes is arranged in the contour line area of the breaking hole, and the expansion cracking hole is used to fill the expansion cracking agent to break the concrete of the breaking hole. Each of the expansion cracking holes is filled with the expansion cracking agent filled by using the expansion cracking cartridge charging device.

6. The underground structure demolition system of claim 5, wherein: Any two adjacent isolation holes partially overlap, the diameter of the isolation hole is 80-100 cm, the hole depth of the isolation hole is 0.9 times the wall thickness, the diameter of the expansion cracking hole is 40-50 mm, and the hole depth of the expansion cracking hole is 0.95 times the wall thickness.

7. The underground structure demolition system of claim 6, wherein: When the cross-sectional shape of the breaking hole is rectangular, each of the expansion cracking holes is arranged in a rectangular array, the hole row distance of each of the expansion cracking holes in the vertical direction is 400-500 mm, and the hole spacing of each of the expansion cracking holes in the horizontal direction is 300-400 mm.

8. The underground structure demolition system of claim 7, wherein: When the cross-sectional shape of the breaking hole is circular, each of the expansion cracking holes is arranged in a circular array, the radius difference of each adjacent array circle is 400-500 mm, and the arc distance between adjacent expansion cracking holes on one array circle is 300-400 mm.

9. The underground structure demolition system of claim 7, wherein: The underground structure breaking system comprises the following steps:

10. A method of breaking down an underground structure, characterized by: ​ A plurality of the isolation holes are arranged on the contour line of the breaking hole, and the bulging holes are arranged on the breaking hole; The bulging agent is filled into each of the bulging holes by using the bulging hole charging device, and bulging is performed.

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