Static blasting demolition method for underground diaphragm wall adjacent to existing building

Abstract

The invention discloses a static blasting demolition method for an underground diaphragm wall adjacent to an existing building, which comprises the following steps of: S1, drilling a blasting hole in the underground diaphragm wall along the vertical direction until a wall body with the height of 1-1.6 meters is reserved at the bottom of the blasting hole; s2, a plurality of blasting holes are formed in the length direction of the underground diaphragm wall at intervals of 0.3-0.5 m, so that the blasting effect covers the whole underground diaphragm wall to be dismantled; s3, an expanding agent and water are injected into the blast hole, the injection depth is 5.5-6.5 m, 2-3 m is reserved at the top of the blast hole to inject an accelerator, and the accelerator rapidly seals the top of the diaphragm wall; and S4, after the diaphragm wall is blasted, the part injected with the accelerator is reserved as the ring beam. The blasting holes are drilled in the underground diaphragm wall, then the expanding agent and the water are injected into the blasting holes, static blasting is achieved, meanwhile, the expanding agent and the water are not injected into the top of the underground diaphragm wall, the expanding agent and the water can be reserved, the ring beam is reserved while the underground diaphragm wall is dismantled, cost is saved, and construction efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of underground continuous wall demolition construction, and in particular to a static blasting demolition method of an underground continuous wall adjacent to an existing building. Background Art

[0002] During foundation pit construction, an underground continuous wall is generally built at the edge of the foundation pit to reinforce the foundation pit and reduce the possibility of collapse. After the construction in the foundation pit is basically completed, this part of the underground continuous wall needs to be demolished.

[0003] However, since some existing buildings are located in close proximity to some underground continuous walls, this part of the underground continuous wall may cause damage to the existing buildings if a conventional demolition method is adopted. Therefore, a demolition method that will not cause damage to the existing buildings is needed. Summary of the invention

[0004] The purpose of this application is to provide a static blasting demolition method for underground continuous walls adjacent to existing buildings, so as to improve the problem that the high-altitude construction of tie beams is relatively troublesome and has high safety hazards.

[0005] This application provides a static blasting demolition method for an underground continuous wall adjacent to an existing building, which adopts the following technical solution: A static blasting demolition method for an underground continuous wall adjacent to an existing building comprises the following steps: S1, drilling blasting holes in the vertical direction on the ground-connected wall, the blasting holes being drilled to a wall body with a height of 1 to 1.6 meters reserved at the bottom; S2, a plurality of blasting holes are arranged at intervals of 0.3 to 0.5 meters along the length direction of the ground-connected wall, so that the blasting effect covers the entire ground-connected wall to be demolished; S3, injecting expansion agent and water into the blasting hole, the injection depth being 5.5 to 6.5 meters, and reserving 2 to 3 meters at the top of the blasting hole for injecting an accelerating setting agent, the accelerating setting agent quickly sealing the top of the ground-connected wall; S4, after the ground-connected wall is blasted, the portion injected with the accelerating setting agent is retained as a ring beam.

[0006] By adopting the above technical solution, blasting holes are drilled on the ground-connected wall, and then expansion agent and water are injected into the blasting holes. A part of the wall is reserved at the bottom of the ground-connected wall, and a quick-setting agent is injected at the top of the blasting hole, which is convenient for limiting the expansion agent and water, forcing the expansion agent and water to expand in the horizontal direction, thereby realizing static blasting. At the same time, the top of the ground-connected wall can be retained because no expansion agent and water are injected, thereby retaining the ring beam while realizing the demolition of the ground-connected wall, saving costs and improving construction efficiency. Compared with the method of drilling blasting holes in the horizontal direction for blasting, drilling blasting holes in the vertical direction is longer in length, so it is easier to control the expansion agent, and more expansion agent can be injected, which helps to improve the effect of static blasting, and it is also convenient to block the blasting hole. The construction method is simple and convenient, thereby greatly improving construction efficiency and construction effect.

[0007] Optionally, the blasting hole is arranged at one end of the ground-connected wall away from the existing building.

[0008] The above technical solution can reduce the possibility of damage to existing buildings during static blasting.

[0009] Optionally, in step S2, after the blasting hole is drilled, energy release holes are drilled on the ground-connected wall, and a plurality of energy release holes are arranged in an array along the length direction of the ground-connected wall.

[0010] Through the above technical solution, the energy release holes can further reduce the possibility of damage to existing buildings during static blasting.

[0011] Optionally, the spacing between adjacent energy release holes is 0.15 to 0.25 meters.

[0012] Through the above technical solution, the spacing between the energy release holes is smaller than the spacing between the blasting holes, which further ensures that there is no possibility of damage to existing buildings when the ground-connected wall is statically blasted.

[0013] Optionally, in step S3, when adding the expansion agent and water, 1 meter of the expansion agent is added first, and then water is added, and this cycle is repeated until the expansion agent increases to a preset height.

[0014] Through the above technical solution, the expansion agent and water are added at intervals, which facilitates the acceleration of the reaction between water and the expansion agent, improves the blasting efficiency, and relatively ensures the uniformity of the reaction.

[0015] Optionally, in step S3, expansion agent and water are injected into the blasting hole through a conduit tool.

[0016] Optionally, the conduit tooling includes a bracket, a first conduit and a second conduit, the first conduit passes through the second conduit, the first conduit is fixedly connected to the second conduit, the second conduit can move in a vertical direction relative to the bracket, and the bracket is provided with a moving component to drive the second conduit to move in a vertical direction; the first conduit is connected to a hopper, the hopper is connected to a discharge component, the output end of the discharge component is arranged toward the inside of the hopper, and the side wall of the second conduit is connected to a first conveying pipe and a second conveying pipe, the first conveying pipe conveys water, and the second conveying pipe conveys an accelerator.

[0017] By adopting the above technical solution, through the arrangement of the feeding assembly, the first conveying pipe and the second conveying pipe, it is convenient to add the expansion agent, water and accelerator through one tool, thereby improving the convenience of charging. At the same time, the moving assembly is used to control the movement of the second conduit, thereby facilitating the intermittent addition of the expansion agent and water.

[0018] Optionally, at least two groups of the moving components are provided along the circumference of the second conduit, and the moving components include a first motor and a roller, the first motor is mounted on a frame, the roller is coaxially fixedly connected to the output shaft of the first motor, and the wheel surface of the roller contacts the side wall of the second conduit.

[0019] Through the above technical solution, the roller contacts the side wall of the second conduit, so that the second conduit can be driven to move by friction, thereby improving construction efficiency and reducing the labor intensity of operators.

[0020] Furthermore, two partition plates are fixedly connected between the first conduit and the second conduit, and the two partition plates divide the space between the first conduit and the second conduit into a water delivery area and an accelerator delivery area. The water delivery area is connected to the first delivery pipe, and the accelerator delivery area is connected to the second delivery pipe.

[0021] Furthermore, the feeding assembly includes a second motor, a barrel, a driving rod and a driving plate, the second motor is fixedly mounted on the hopper, the barrel is detachably connected to the hopper, the driving rod is coaxially rotatably connected to the barrel and is located inside the barrel, a driving hole is provided in the driving rod for inserting the output end of the second motor, the driving hole is adapted to the output shaft of the second motor and has a non-circular cross-section, the driving plate is provided on the side wall of the driving rod, and there are multiple driving plates in a circumferential array along the driving rod, and charging areas are formed between adjacent driving plates, the number of charging areas is equal to the number of times expansion agent needs to be added to each blasting hole, and a material baffle plate is provided for sliding at the bottom of the hopper.

[0022] By adopting the above technical solution, the charge amount of a barrel corresponds to the charge amount in a blasting hole. At the same time, every time the expansion agent needs to be added, it is only necessary to rotate the driving rod so that the corresponding charging area corresponds to the hopper, thereby improving the accuracy and convenience of charging.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. Drill blasting holes on the ground-connected wall, and then inject expansion agent and water into the blasting holes. A part of the wall is reserved at the bottom of the ground-connected wall, and a quick-setting agent is injected at the top of the blasting hole to limit the expansion agent and water, forcing the expansion agent and water to expand in the horizontal direction, thereby achieving static blasting. At the same time, the top of the ground-connected wall can be retained because no expansion agent and water are injected. Thus, the ring beam can be retained while the ground-connected wall is demolished, saving costs and improving construction efficiency. 2. The energy-draining holes can further reduce the possibility of damage to existing buildings during static blasting; 3. By adding the expansion agent and water at intervals, it is convenient to accelerate the reaction between water and expansion agent, improve the blasting efficiency, and relatively ensure the uniformity of the reaction; 4. Through the arrangement of the material discharge assembly, the first conveying pipe and the second conveying pipe, it is convenient to add the expansion agent, water and quick-setting agent through one tool, which improves the convenience of charging. At the same time, the second conduit is controlled by the moving assembly to facilitate the interval addition of the expansion agent and water; 5. The charge amount of a barrel corresponds to the charge amount in a blasting hole. At the same time, every time you need to add expansion agent, you only need to rotate the drive rod so that the corresponding charging area corresponds to the hopper, which improves the accuracy and convenience of charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a static blasting demolition method of an underground continuous wall adjacent to an existing building in the present invention.

[0025] Figure 2 It is a schematic diagram of the catheter tooling in the present invention.

[0026] Figure 3 2 is a three-dimensional schematic diagram of a partition plate in the present invention.

[0027] Figure 4 It is a three-dimensional schematic diagram of the driving plate and the driving rod in the present invention.

[0028] In the figure, 1, ground-connected wall; 11, blasting hole; 12, energy discharge hole; 13, existing building; 2, bracket; 21, first conduit; 22, second conduit; 23, moving assembly; 231, first motor; 232, roller; 24, unloading assembly; 241, second motor; 242, barrel; 243, driving rod; 244, driving plate; 245, driving hole; 246, charging area; 247, material blocking plate; 248, first conveying pipe; 249, second conveying pipe; 25, guide ring; 26, partition plate; 27, hopper. DETAILED DESCRIPTION

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] A static blasting demolition method for underground continuous walls adjacent to existing buildings, referring to Figure 1 , including the following steps: S1. Drill a blasting hole 11 in the ground-connected wall 1 in the vertical direction. The blasting hole 11 is drilled to a wall with a reserved height of 1 to 1.6 meters at the bottom, which is 1.5 meters in this embodiment.

[0032] S2. Several blasting holes 11 are arranged at intervals of 0.3-0.5 meters along the length direction of the ground-connected wall 1, and 0.4 meters in this embodiment, so that the blasting effect covers the entire ground-connected wall 1 to be demolished. The blasting holes 11 are arranged at one end of the ground-connected wall 1 away from the existing building 13, so as to reduce the possibility of damage to the existing building 13 during static blasting. After the blasting holes 11 are drilled, energy-draining holes 12 are drilled on the ground-connected wall 1. Multiple energy-draining holes 12 are arranged in an array along the length direction of the ground-connected wall 1, and the spacing between adjacent energy-draining holes 12 is 0.15 to 0.25 meters. The energy-draining holes 12 are convenient for further reducing the possibility of damage to the existing building 13 during static blasting.

[0033] S3. Inject expansion agent and water into the blasting hole 11 through the conduit tooling, the injection depth is 5.5 to 6.5 meters, 6 meters in this embodiment, and reserve 2-3 meters at the top of the blasting hole 11 to inject the quick-setting agent, which quickly seals the top of the ground-connected wall 1. When adding expansion agent and water, add 1 meter of expansion agent first, then add water, and repeat this cycle until the expansion agent increases to a preset height. By adding expansion agent and water at intervals, it is convenient to accelerate the reaction between water and expansion agent, improve blasting efficiency, and relatively ensure the uniformity of the reaction.

[0034] The expansion agent may be calcium oxide. The energy release hole 12 may be drilled synchronously when the blast hole 11 is charged.

[0035] S4. After the ground-anchored wall 1 is blasted, the portion injected with the quick-setting agent is retained as a ring beam.

[0036] During construction, a blasting hole 11 is first drilled on the ground-connected wall 1, and then an expansion agent and water are injected into the blasting hole 11. A part of the wall is reserved at the bottom of the ground-connected wall 1, and a quick-setting agent is injected at the top of the blasting hole 11, which is convenient for limiting the expansion agent and water, forcing the expansion agent and water to expand in the horizontal direction, thereby realizing static blasting. At the same time, the top of the ground-connected wall 1 can be retained because no expansion agent and water are injected, thereby retaining the ring beam while realizing the demolition of the ground-connected wall 1, saving costs and improving construction efficiency. After the blasting hole 11 is drilled, the energy release hole 12 is continued to be drilled to release energy and reduce the damage to the existing building 13 caused by the blasted part of the ground-connected wall 1.

[0037] Specifically, refer to Figures 2 to 4 The conduit tooling includes a bracket 2, a first conduit 21 and a second conduit 22. The first conduit 21 passes through the second conduit 22. The first conduit 21 is fixedly connected to the second conduit 22. The second conduit 22 can move in the vertical direction relative to the bracket 2. The bracket 2 is provided with a moving assembly 23 to drive the second conduit 22 to move in the vertical direction. The first conduit 21 is connected to a hopper 27, and a material discharge assembly 24 is connected to the hopper 27. The output end of the material discharge assembly 24 is arranged toward the inside of the hopper 27. The side wall of the second conduit 22 is connected to a first delivery pipe 248 and a second delivery pipe 249. The first delivery pipe 248 delivers water, and the second delivery pipe 249 delivers an accelerator.

[0038] During construction, by setting up the unloading component 24, the first delivery pipe 248 and the second delivery pipe 249, it is convenient to add the expansion agent, water and accelerator through one tool, thereby improving the convenience of charging. At the same time, the moving component 23 is used to control the movement of the second conduit 22, so as to realize the intermittent addition of the expansion agent and water.

[0039] More specifically, at least two groups of moving components 23 are provided along the circumference of the second conduit 22. The moving components 23 include a first motor 231 and a roller 232. The first motor 231 is mounted on the frame. The roller 232 is coaxially fixedly connected to the output shaft of the first motor 231. The wheel surface of the roller 232 contacts the side wall of the second conduit 22. The roller 232 contacts the side wall of the second conduit 22, so that the second conduit 22 can be driven to move by friction, which improves the construction efficiency and reduces the labor intensity of the operator. A guide ring 25 is also fixedly connected to the bracket 2. The guide ring 25 is used for the second conduit 22 to pass through so as to guide the second conduit 22.

[0040] Specifically, two partition plates 26 are fixedly connected between the first conduit 21 and the second conduit 22. The two partition plates 26 divide the space between the first conduit 21 and the second conduit 22 into a water supply area and an accelerator supply area. The water supply area is connected to the first delivery pipe 248, and the accelerator supply area is connected to the second delivery pipe 249, so as to add water and accelerator respectively.

[0041] More specifically, the feeding assembly includes a second motor 241, a barrel 242, a driving rod 243 and a driving plate 244. The second motor 241 is fixedly mounted on the hopper 27. The barrel 242 is detachably connected to the hopper 27 by bolts. The driving rod 243 is coaxially rotatably connected to the barrel 242 and is located inside the barrel 242. A driving hole 245 is provided inside the driving rod 243 for the output end of the second motor 241 to be inserted. The driving hole 245 is adapted to the output shaft of the second motor 241 and has a non-circular cross section so that the second motor 241 can drive the driving rod 243 to rotate. The driving plate 244 is fixedly connected to the side wall of the driving rod 243. There are multiple driving plates 244 arranged along the circumferential array of the driving rod 243. A charging area 246 is formed between adjacent driving plates 244. The number of charging areas 246 is equal to the number of times each blasting hole 11 needs to add expansion agent. The charge amount of a barrel 242 corresponds to the charge amount in a blasting hole 11. Each time a new blasting hole 11 is charged, a barrel 242 is replaced. At the same time, each time an expansion agent needs to be added, it is only necessary to rotate the driving rod 243 so that the corresponding charging area 246 corresponds to the hopper 27, thereby improving the accuracy and convenience of charging. In this embodiment, there are six charging areas 246, that is, each time the driving rod 243 rotates 60 degrees. A blocking plate 247 is slidably provided at the bottom of the hopper 27 to control the discharge of materials.

[0042] Working principle: a blasting hole 11 is drilled on the ground-connected wall 1, and then an expansion agent and water are injected into the blasting hole 11. A part of the wall is reserved at the bottom of the ground-connected wall 1, and a quick-setting agent is injected at the top of the blasting hole 11 to restrict the expansion agent and water, forcing the expansion agent and water to expand in the horizontal direction, thereby realizing static blasting. At the same time, the top of the ground-connected wall 1 can be retained because no expansion agent and water are injected. Therefore, when the ground-connected wall 1 is demolished, the ring beam is retained, saving costs and improving construction efficiency.

[0043] The energy-draining holes 12 are convenient for further reducing the possibility of damage to the existing building 13 during static blasting.

[0044] By adding the expansion agent and water at intervals, the reaction between water and the expansion agent can be accelerated, the blasting efficiency can be improved, and the uniformity of the reaction can be relatively guaranteed.

[0045] By providing the unloading assembly 24, the first delivery pipe 248 and the second delivery pipe 249, it is convenient to add the expansion agent, water and quick-setting agent through one tool, thereby improving the convenience of charging. At the same time, the moving assembly 23 is used to control the movement of the second conduit 22, so as to facilitate the intermittent addition of the expansion agent and water.

[0046] The charge amount of a barrel 242 corresponds to the charge amount in a blasting hole 11. At the same time, every time the expansion agent needs to be added, it is only necessary to rotate the driving rod 243 so that the corresponding charging area 246 corresponds to the hopper 27, thereby improving the accuracy and convenience of charging.

[0047] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A static blasting demolition method for underground continuous walls adjacent to existing buildings, characterized in that: The steps include: S1, drilling a blasting hole (11) in the vertical direction on the ground-connected wall (1), and the blasting hole (11) is drilled to the wall with a height of 1 to 1.6 meters reserved at the bottom; S2. A plurality of blasting holes (11) are arranged at intervals of 0.3-0.5 meters along the length direction of the ground-connected wall (1), so that the blasting effect covers the entire ground-connected wall (1) to be demolished; S3, injecting expansion agent and water into the blasting hole (11) to a depth of 5.5 to 6.5 meters, and leaving 2 to 3 meters at the top of the blasting hole (11) for injecting quick-setting agent, so that the quick-setting agent quickly seals the top of the ground-connected wall (1); S4. After the ground-anchored wall (1) is blasted, the portion injected with the quick-setting agent is retained as a ring beam.

2. The static blasting demolition method of an underground continuous wall adjacent to an existing building (13) according to claim 1, characterized in that: The blasting hole (11) is arranged at one end of the ground-connected wall (1) away from the existing building (13).

3. The static blasting demolition method of an underground continuous wall adjacent to an existing building (13) according to claim 2 is characterized in that: In step S2, after the blasting hole (11) is drilled, an energy discharge hole (12) is drilled on the ground-connected wall (1), and a plurality of energy discharge holes (12) are arranged in an array along the length direction of the ground-connected wall (1).

4. The static blasting demolition method of an underground continuous wall adjacent to an existing building (13) according to claim 3 is characterized in that: The spacing between adjacent energy drain holes (12) is 0.15 to 0.25 meters.

5. The static blasting demolition method of an underground continuous wall adjacent to an existing building (13) according to claim 1, characterized in that: In step S3, when adding the expansion agent and water, 1 meter of the expansion agent is added first, and then water is added, and this cycle is repeated until the expansion agent increases to a preset height.

6. The static blasting demolition method of an underground continuous wall adjacent to an existing building (13) according to claim 5, characterized in that: In step S3, expansion agent and water are injected into the blasting hole (11) through the conduit tool.

7. The static blasting demolition method of an underground continuous wall adjacent to an existing building (13) according to claim 6, characterized in that: The catheter tooling comprises a support (2), a first catheter (21) and a second catheter (22), wherein the first catheter (21) passes through the second catheter (22), the first catheter (21) and the second catheter (22) are fixedly connected, the second catheter (22) can move in a vertical direction relative to the support (2), and the support (2) is provided with a moving component (23) to drive the second catheter (22) to move in a vertical direction; The first conduit (21) is connected to a hopper (27), the hopper (27) is connected to a material discharge assembly (24), the output end of the material discharge assembly (24) is arranged toward the inside of the hopper (27), and the side wall of the second conduit (22) is connected to a first delivery pipe (248) and a second delivery pipe (249), the first delivery pipe (248) delivers water, and the second delivery pipe (249) delivers an accelerating agent.

8. The static blasting demolition method of an underground continuous wall adjacent to an existing building (13) according to claim 7, characterized in that: The moving assembly (23) is provided with at least two groups along the circumference of the second conduit (22), and the moving assembly (23) comprises a first motor (231) and a roller (232), wherein the first motor (231) is mounted on a frame, the roller (232) is coaxially fixedly connected to an output shaft of the first motor (231), and the wheel surface of the roller (232) contacts the side wall of the second conduit (22).

9. The static blasting demolition method of an underground continuous wall adjacent to an existing building (13) according to claim 7, characterized in that: Two partition plates (26) are fixedly connected between the first conduit (21) and the second conduit (22), and the two partition plates (26) divide the space between the first conduit (21) and the second conduit (22) into a water delivery area and an accelerator delivery area. The water delivery area is connected to the first delivery pipe (248), and the accelerator delivery area is connected to the second delivery pipe (249).

10. The static blasting demolition method of an underground continuous wall adjacent to an existing building (13) according to claim 7, characterized in that: The feeding assembly comprises a second motor (241), a barrel (242), a driving rod (243) and a driving plate (244); the second motor (241) is fixedly mounted on the hopper (27); the barrel (242) is detachably connected to the hopper (27); the driving rod (243) is coaxially rotatably connected to the barrel (242) and is located inside the barrel (242); a driving hole (245) is provided inside the driving rod (243) for inserting the output end of the second motor (241); The driving hole (245) is adapted to the output shaft of the second motor (241) and has a non-circular cross-section. The driving plate (244) is arranged on the side wall of the driving rod (243). There are a plurality of driving plates (244) arranged in a circumferential array along the driving rod (243). Charge areas (246) are formed between adjacent driving plates (244). The number of charge areas (246) is equal to the number of times each blasting hole (11) needs to add expansion agent. A material blocking plate (247) is slidably disposed at the bottom of the hopper (27).

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