Multi-pit foundation sectioned demolition support device

Abstract

This invention relates to the field of building construction technology, specifically to a multi-pit foundation segmented demolition support device. It includes a top support assembly detachably connected to a base plate, and a grouting assembly within the top support assembly. The top support assembly includes a main cylinder, a secondary cylinder, and an oil cylinder. A piston is slidably connected within the main cylinder, and a push rod is fixedly connected to the piston. A differential pressure check valve is fixedly connected at the connection between the main cylinder and the secondary cylinder, and an overflow valve is fixedly connected at the connection between the main cylinder and the oil cylinder. The grouting assembly includes a grouting pipe and a grout cylinder. An air storage cylinder is slidably connected to the main cylinder, and the air storage cylinder is slidably connected to the grout cylinder. The grout cylinder is connected to the grouting pipe, and the grouting pipe penetrates the base plate. The grout cylinder and the air storage cylinder are elastically slidably connected. The push rod passes sequentially through the air storage cylinder and the grout cylinder. The grout cylinder is connected to the grouting pipe via a high-pressure check valve. The push rod is physically locked by the differential pressure check valve between the main cylinder and the secondary cylinder to prevent detachment and failure. Through the grout cylinder and the air storage cylinder, an automatic grouting reinforcement response is achieved when the wall deforms, avoiding excessive support force overall.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a multi-pit foundation segment dismantling support device. Background Technology

[0002] In foundation pit engineering, when it is necessary to remove the main concrete supports in sections, temporary jacking devices are usually pre-installed in the sections where supports are not removed to ensure the stability of the retaining structure. The core function of these devices is to reliably transmit the soil pressure on the unremoved supports by clamping the walls and floors on both sides, thereby replacing the removed supports and maintaining the stress path.

[0003] In existing technologies, the support structures used in the segmented demolition of multi-pit foundations are usually rigid passive supports such as traditional steel pipe supports or concrete supports. Once installed, such rigid structures can provide effective support between the walls and floors, which facilitates the subsequent dismantling of the original support structure installed during construction. After the dismantling and construction are completed, the steel pipes can be removed using bolts and hydraulic presses, thus completing the construction.

[0004] However, when using such rigid passive supports, their supporting force cannot adaptively adjust to the slight deformation of the wall structure. In this case, if the wall shifts inward during the construction of adjacent foundation pits, the supports will fail and fall due to their inability to lock in place. Consequently, the wall loses its support, which can easily trigger a chain reaction of collapses. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-pit foundation pit segmented dismantling support device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-pit foundation pit segmented demolition support device, comprising a top support assembly detachably connected to a base plate, wherein a grouting assembly is provided inside the top support assembly; The top support assembly includes a main cylinder, an auxiliary cylinder, and an oil cylinder. A piston is slidably connected inside the main cylinder, and a push rod is fixedly connected to the piston. The other end of the push rod applies pressure to the base plate. A differential pressure check valve is fixedly connected at the connection between the main cylinder and the auxiliary cylinder. An overflow valve is fixedly connected at the connection between the main cylinder and the oil cylinder. A high-pressure oil pump is fixedly connected inside the oil cylinder, and the other end of the high-pressure oil pump is connected to the main cylinder. The grouting assembly includes a grouting pipe and a grout cylinder. An air storage chamber is provided in the main cylinder. An air storage cylinder is slidably connected to the main cylinder. The air storage cylinder is slidably connected to the grout cylinder. The grout cylinder is connected to the grouting pipe. The grout cylinder and the air storage cylinder are elastically slidably connected. A push rod passes through the air storage cylinder and the grout cylinder in sequence. The grout cylinder is connected to the grouting pipe through a high-pressure one-way valve. The grouting pipe passes through the top plate and the base plate.

[0007] Preferably, one end of the main cylinder, auxiliary cylinder, and oil cylinder is fixedly connected to the same fixing plate, the input end of the high-pressure oil pump is connected to the oil cylinder, and the output end is connected to the inside of the main cylinder. The main cylinder, auxiliary cylinder, and oil cylinder are fixedly connected.

[0008] Preferably, a limiting ring is fixedly connected inside the main cylinder, and an air storage cylinder is slidably connected to the end of the main cylinder away from the fixed plate. A piston is slidably connected inside the main cylinder, and the piston is located between the air storage cylinder and the limiting ring. A push rod is also fixedly connected to the piston. The push rod passes through the main cylinder, the air storage cylinder, and the paddle cylinder in sequence and is fixedly connected to the top plate. The push rod is fixedly connected to the air storage cylinder, and an air storage chamber is set between the piston and the air storage cylinder inside the main cylinder.

[0009] Pressure is applied to the inside of the main cylinder by the oil cylinder, thereby pushing the push rod to slide. When the top plate and the base plate make precise contact, the whole structure provides support.

[0010] Preferably, both the gas storage chamber and the gas storage cylinder are filled with nitrogen. A limiting plate is fixedly connected to the surface of the gas storage cylinder, and a slidable cylinder is slidably connected to the surface of the gas storage cylinder. A spring is fixedly connected to one end of the slid cylinder, and the other end of the spring is fixedly connected to the limiting plate. In the initial state, the spring is in a compressed state. Several air guide holes are opened on one side of the gas storage cylinder, and several sealing plugs are fixedly connected to the inner side of the slid cylinder. The sealing plugs are sealed and inserted into the air guide holes.

[0011] As the push rod slides, the gas storage cylinder slides accordingly, creating a gap between the gas inlet and the sealing plug to allow compressed nitrogen to flow. Preferably, a piston is slidably connected inside the slurry cylinder, and several high-pressure one-way valves are uniformly fixedly connected to the end of the slurry cylinder. The input end of the high-pressure one-way valve is in communication with the inside of the slurry cylinder, and the output end is fixedly connected to a guide pipe. The other end of the guide pipe is fixedly connected to the grouting pipe, and the end of the grouting pipe passes through the top plate and the base plate in sequence. The grouting pipe is fixedly connected to the top plate.

[0012] Preferably, two symmetrically arranged limiting strips are fixedly connected to the side of the impeller and the surface of the main cylinder, respectively. The limiting strip connected to the impeller is slidably connected to the limiting strip on the surface of the main cylinder. Several insertion holes are evenly opened on the surface of the limiting strips, and a fixing bolt is threaded into the insertion holes of the two limiting strips.

[0013] By injecting pressurized, quick-setting grout into the wall through a grout cylinder, the structure transforms from a support to a rigid fixation, thereby improving the strength and stability of the support. Preferably, a piston is slidably connected inside the auxiliary cylinder, the auxiliary cylinder is filled with nitrogen, a differential pressure check valve is provided between the auxiliary cylinder and the main cylinder, the flow direction of the differential pressure check valve is from the main cylinder to the auxiliary cylinder, the input end of the overflow valve is connected to the main cylinder, and the output end is connected to the oil cylinder, and both the differential pressure check valve and the overflow valve are located between the limit ring and the fixed plate.

[0014] Preferably, the substrate has several positioning holes on its surface, the grouting pipe is inserted into the positioning holes, and the top plate is detachably connected to the substrate surface.

[0015] The upper limit of the support force is set by the overflow valve, and the main cylinder is opened and closed when the push rod slides unexpectedly by the differential pressure check valve, so as to close it. At the same time, the closing window of the differential pressure check valve is used to provide space for the push rod to slide.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. By using the differential pressure check valve between the main cylinder and the auxiliary cylinder, the differential pressure check valve can be closed instantaneously when the wall deforms, thereby sealing the main cylinder into a closed space, thus physically locking the push rod in the current position, thereby avoiding the problem of instantaneous failure of support when the wall is displaced, thus ensuring that the wall is always effectively supported throughout the entire process of deformation. 2. By the relative sealing and sliding of the slurry cylinder and the air storage cylinder and the sealing and insertion of the air guide hole, when the push rod slides abnormally, the sealing plug and the air guide hole are forcibly separated instantly. The pre-compressed nitrogen in the air storage chamber pushes the piston two to inject the quick-setting slurry into the soil behind the wall under high pressure for rapid solidification and reinforcement. This achieves the response effect of automatic grouting reinforcement when the wall deforms, effectively avoiding the possibility of collapse. At the same time, it makes the device suitable for multi-pit environments. 3. The overflow valve allows excess hydraulic oil to automatically overflow back into the oil cylinder, thereby avoiding excessive support force and preventing damage to the wall or equipment due to overload. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the top support component structure of the present invention; Figure 3 This is a schematic diagram of the structure of the substrate of the present invention located on one side of the top plate; Figure 4 This is a schematic diagram of the overall internal structure of the present invention; Figure 5 This is a schematic diagram of the internal structure of the main cylinder of the present invention; Figure 6 This is a schematic diagram of the internal structure of the gas storage cylinder of the present invention.

[0018] In the diagram: 1. Base plate; 2. Top support assembly; 3. Top plate; 4. Main cylinder; 41. Limiting ring; 42. Piston one; 43. Push rod; 44. Limiting strip; 45. Fixing bolt; 46. Air guide hole; 47. Air storage chamber; 48. Limiting plate; 5. Grouting assembly; 51. Grout cylinder; 52. Sealing plug; 53. Piston two; 54. Guide pipe; 55. Grouting pipe; 56. High-pressure check valve; 57. Spring; 6. Auxiliary cylinder; 61. Piston three; 7. Oil cylinder; 71. High-pressure oil pump; 72. Overflow valve; 73. Differential pressure check valve; 8. Fixing plate; 11. Positioning hole; 12. Air storage cylinder; 13. First building structure; 14. Second building structure. Detailed Implementation

[0019] 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.

[0020] Please see Figure 1-6 This invention provides a technical solution: a multi-pit foundation segment dismantling support device, including a top support component 2 detachably connected to a base plate 1. The base plate 1 is fixedly connected to the support replacement point surface of the partition wall by expansion bolts, etc. The U-shaped protrusion on its surface facilitates the rapid positioning of the support component, thereby facilitating subsequent installation. A grouting component 5 is provided inside the top support component 2. The top support component 2 is used for overall support replacement, and the grouting component 5 is used to detect the state of the wall. When the wall deforms, the top support component 2 instantly self-locks, and the grouting component 5 injects quick-setting grout into the back soil of the inner foundation pit sidewall, thereby protecting the wall and preventing collapse.

[0021] The top support assembly 2 mainly includes a main cylinder 4, a secondary cylinder 6, and an oil cylinder 7. A piston 42 is slidably connected inside the main cylinder 4, dividing it into a front chamber and a rear chamber. The chamber furthest from the fixed plate 8 is the front chamber. A push rod 43 is fixedly connected to the piston 42. The push rod 43 passes sequentially through the main cylinder 4, the air reservoir 12, and the paddle cylinder 51, and is fixedly connected to the top plate 3. The push rod 43 is fixedly connected to the air reservoir 12. When the push rod 43 slides, the air reservoir 12 moves accordingly. The oil cylinder 7 is pre-filled with hydraulic oil, and a high-pressure oil pump 71 is fixedly connected inside. The input end is connected to the oil cylinder 7, and the output end is connected to the inside of the main cylinder 4. The high-pressure oil pump 71 facilitates the delivery of hydraulic oil to the rear cavity of the main cylinder 4. The main cylinder 4, the auxiliary cylinder 6, and the oil cylinder 7 are fixedly connected. An overflow valve 72 is fixedly connected at the connection between the main cylinder 4 and the oil cylinder 7. The input end of the overflow valve 72 is connected to the main cylinder 4, and the output end is connected to the oil cylinder 7. The overflow valve 72 can be preset with pressure. When the pressure in the rear cavity reaches the preset pressure, the overflow valve 72 automatically opens and automatically closes when it is lower than the preset pressure. The surface of the overflow valve 72 is provided with a manual opening valve, which facilitates quick pressure relief during disassembly.

[0022] A differential pressure check valve 73 is fixedly connected at the connection between the main cylinder 4 and the auxiliary cylinder 6. The flow direction of the differential pressure check valve 73 is from the rear chamber of the main cylinder 4 to the inner chamber of the auxiliary cylinder 6. A piston 61 is slidably connected inside the auxiliary cylinder 6. At the same time, the auxiliary cylinder 6 is filled with nitrogen gas, which is compressible, thus facilitating the sliding of the piston 61. One end of the main cylinder 4, the auxiliary cylinder 6, and the oil cylinder 7 are all fixedly connected to the same fixing plate 8. The fixing plate 8 is installed on the surface of an existing floor slab or other object. When the high-pressure oil pump 71 injects hydraulic oil into the main cylinder 4, the pressure inside the main cylinder 4 increases. At this time, a pressure difference is generated between the main cylinder 4 and the auxiliary cylinder 6, which drives the hydraulic oil in the main cylinder 4 to be injected into the auxiliary cylinder 6 through the differential pressure check valve 73, thereby pushing the piston. Nitrogen gas in the sliding compression auxiliary cylinder 6 is used to form a support structure. When the entire structure begins to form a support, the pressure in the main cylinder 4 and the auxiliary cylinder 6 are equal, thus preparing for self-locking. At this time, when the pressure in the main cylinder 4 suddenly drops, the pressure in the auxiliary cylinder 6 is greater than the pressure in the main cylinder 4. At this time, the differential pressure check valve 73 closes instantly, and a closed environment is formed in the main cylinder 4. The extremely low compressibility of the hydraulic oil locks and reduces the pressure on the piston 42, thereby avoiding excessive pushing. Since the pressure used for the support is usually about 20MPa, the hydraulic oil will be compressed very slightly at this time. This amount of compression does not affect the support, but it can cause gaps to appear between the sealing plug 52 and the air guide hole 46.

[0023] A limiting ring 41 is fixedly connected inside the main cylinder 4. The differential pressure check valve 73 and the overflow valve 72 are both located between the limiting ring 41 and the fixed plate 8. At this time, the sliding of the piston 42 can be limited by the limiting ring 41, so as to prevent the hydraulic oil remaining in the differential pressure check valve 73 or the overflow valve 72 from entering the front chamber. The overall cross-section of the air storage cylinder 12 is convex. The end of the main cylinder 4 away from the fixed plate 8 is fixedly connected to the small end of the air storage cylinder 12 in a sealed sliding connection. The inner cavity of the air storage cylinder 12 is connected to the front chamber of the main cylinder 4. The piston 42 is located between the air storage cylinder 12 and the limiting ring 41, and a push rod 43 is fixedly connected at the same time. When the piston is pushed by the hydraulic oil, the air storage cylinder 12 and the push rod 43 move accordingly. The front chamber between the piston 42 and the air storage cylinder 12 in the main cylinder 4 is set as the air storage chamber 47. Both the air storage chamber 47 and the air storage cylinder 12 are filled with nitrogen, which facilitates energy storage.

[0024] The grouting assembly 5 mainly includes a grouting pipe 55 and a grout cylinder 51. A limiting plate 48 is fixedly connected to the surface of the air storage cylinder 12. The grout cylinder 51 is slidably connected to the surface of the air storage cylinder 12. A spring 57 is fixedly connected to one end of the grout cylinder 51. The other end of the spring 57 is fixedly connected to the limiting plate 48. In the initial state, the spring 57 is in a compressed state. When the piston 42 moves to the end of the front chamber, the pressure of nitrogen is still less than the elastic force of the spring 57. At the same time, the elastic force of the spring 57 is less than the top support force of the device during operation. Several air guide holes 46 are opened on one side of the air storage cylinder 12. The air guide holes 46 are conical to improve the sealing pressure. Several sealing plugs 52 are fixedly connected to the inner side of the air storage cylinder 12. The sealing plugs 52 are sealed and inserted into the air guide holes 46. At this time, the elastic force of the spring 57 can make the sealing plugs 52 tightly inserted into the air guide holes 46, thereby ensuring the sealing of the air storage chamber 47 during the support operation.

[0025] A piston 53 is slidably connected inside the slurry cylinder 51. The cylinder 51 is pre-filled with quick-setting slurry. When the piston 53 moves, the pressure from the piston 53 forces the quick-setting slurry out. Several high-pressure check valves 56 are uniformly fixedly connected to the end of the slurry cylinder 51. The input end of the high-pressure check valve 56 communicates with the inside of the slurry cylinder 51. The pressure threshold of the high-pressure check valve 56 is equal to the pressure of nitrogen in the gas storage chamber 47 when the piston 42 moves to one-quarter of its total stroke. A guide pipe 54 is fixedly connected to the output end of the high-pressure check valve 56. The other end of the guide pipe 54 is fixedly connected to the grouting pipe 55. The end of the grouting pipe 55 passes through the top plate 3 and the base plate 1 in sequence. The top plate 3 is fixedly connected to the end of the push rod 43. A pressure sensor is pre-installed in the top plate 3 to facilitate real-time monitoring of the pressure of the top support. The grouting pipe 55 is fixedly connected to the top plate 3. Several positioning holes 11 are opened on the surface of the base plate 1. The top plate 3 is detachably installed on the surface of the base plate 1, and the grouting pipe 55 is inserted into the positioning holes 11. Two symmetrically arranged limiting strips 44 are welded to the side of the air storage tank 12 and the surface of the main cylinder 4, respectively. The limiting strip 44 connected to the impeller 51 is straight and has a groove on the surface of the limiting strip 44 on the surface of the main cylinder 4. The straight limiting strip 44 is slidably connected to the groove of the limiting strip 44 on the surface of the main cylinder 4 to prevent the impeller 51 from rotating. Several insertion holes are evenly opened on the surface of the limiting strip 44. The insertion holes of two limiting strips 44 are connected to the threaded fixing bolts 45 to fix the position of the impeller 51.

[0026] In actual use, the support points are determined on the surface of the first building structure 13, and then the base plate 1 is connected to the first building structure 13 by expansion bolts. If the first building structure 13 is a high-strength hard material such as concrete, it is necessary to drill holes along the positioning holes 11 in advance to facilitate the insertion of the grouting pipe 55. After installation, the device is fixedly installed at the corresponding position of the second building structure 14 by fixing plate 8. The opening pressure of the overflow valve 72 is set higher than the sum of the nitrogen compression pressure and the support force in the device. At the same time, quick-setting grout is added into the grout cylinder 51. At this time, the hydraulic oil pump is started, and the hydraulic oil pump pumps the hydraulic oil in the oil cylinder 7 into the rear chamber of the main cylinder 4.

[0027] During this process, the hydraulic oil simultaneously applies pressure to piston 42, differential pressure check valve 73, and overflow valve 72. Since the pressure has not reached the supporting pressure, overflow valve 72 is closed. At this time, piston 42 begins to move towards base plate 1. The piston moves without moving air storage cylinder 12 and top plate 3 via push rod 43. Air storage cylinder 12 moves synchronously to push slurry cylinder 51 through the supporting force of spring 57. Limiting strip 44 begins to slide relative to each other. At the same time, fine adjustment allows grouting pipe 55 to be inserted into positioning hole 11. During the movement, sealing plug 52 is always sealed to air guide hole 46. At the same time, nitrogen in air storage chamber 47 is compressed, which causes the pressure in main cylinder 4 to gradually increase. At this time, the pressure in main cylinder 4 is greater than that in auxiliary cylinder 6, thus opening differential pressure check valve 73. Hydraulic oil flows synchronously into auxiliary cylinder 6 and pushes piston 61 to slide and compress nitrogen in auxiliary cylinder 6.

[0028] When the top plate 3 contacts the surface of the base plate 1, piston 42 becomes almost immobile. At this time, the high-pressure oil pump 71 continues to pump in, piston 42 does not move, and piston 61 continues to move. During this process, the pressure of the top plate 3 on the base plate 1 increases rapidly. The operator monitors the support force through the pressure sensor. When the specified support force is reached, the overflow valve 72 is opened under pressure. Then, all the hydraulic oil pumped in afterward will overflow back into the oil cylinder 7 through the overflow valve 72, thereby maintaining a constant support force. When the construction personnel find that the overflow valve 72 is continuously open, they can control the high-pressure oil pump 71 to standby to prevent backflow, thereby fixing the slurry cylinder 51. Then, the fixing bolts 45 are inserted into the aligned holes, and stable support can be provided at this time.

[0029] When other adjacent foundation pit operations cause the first building structure 13 to deform inward due to changes in force, it drives the base plate 1 to displace away from the device. This displacement is transmitted to piston 42 through the top plate 3 and push rod 43, causing piston 42 to slide instantaneously. At this time, the pressure in the main cylinder 4 drops instantly, and the differential pressure check valve 73 changes from open to closed. In the extremely short response time of this change, compressed nitrogen in the auxiliary cylinder 6 pushes piston 53 to slide, thereby replenishing a small amount of hydraulic oil into the main cylinder 4. When the differential pressure check valve 73 closes, a sealed space is formed in the main cylinder 4, thereby locking the position of push rod 43 with a fixed amount of hydraulic oil inside. This reduces the supporting force while maintaining support and locking the position of push rod 43. During deformation, as push rod 43 slides, air storage cylinder 12 also slides synchronously. Since limit strip 44 fixes the position of slurry cylinder 51, air storage cylinder 12 and slurry cylinder 51 slide relative to each other, causing a gap to form between the sealing plug 52 and the air guide hole 46. At this time, compressed nitrogen gas in air storage chamber 47 enters slurry cylinder 51 through air guide hole 46 and pushes piston 2 53, thereby pressurizing the quick-setting slurry and injecting it into the soil behind the first building structure 13 through grouting pipe 55 and rapidly solidifying it, thereby fundamentally improving the stability of the soil and preventing collapse.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-pit foundation pit segmented demolition support device, characterized in that: Includes a top support assembly (2) that is detachably connected to the substrate (1), and a grouting assembly (5) is provided inside the top support assembly (2); The top support assembly (2) includes a main cylinder (4), a secondary cylinder (6) and an oil cylinder (7). A piston (42) is slidably connected inside the main cylinder (4). A push rod (43) is fixedly connected to the piston (42). The other end of the push rod (43) applies pressure to the base plate (1). A differential pressure check valve (73) is fixedly connected at the connection between the main cylinder (4) and the secondary cylinder (6). An overflow valve (72) is fixedly connected at the connection between the main cylinder (4) and the oil cylinder (7). A high-pressure oil pump (71) is fixedly connected inside the oil cylinder (7). The other end of the high-pressure oil pump (71) is connected to the main cylinder (4). The grouting assembly (5) includes a grouting pipe (55) and a grout cylinder (51). An air storage chamber (47) is provided in the main cylinder (4). An air storage cylinder (12) is slidably connected to the main cylinder (4). The air storage cylinder (12) is slidably connected to the grout cylinder (51). The grout cylinder (51) is connected to the grouting pipe (55). The grout cylinder (51) is elastically slidably connected to the air storage cylinder (12). The push rod (43) passes through the air storage cylinder (12) and the grout cylinder (51) in sequence. The grout cylinder (51) is connected to the grouting pipe (55) through a high-pressure one-way valve (56). The grouting pipe (55) passes through the top plate (3) and the base plate (1).

2. The multi-pit foundation pit segmented demolition support device according to claim 1, characterized in that: The main cylinder (4), auxiliary cylinder (6) and oil cylinder (7) are all fixedly connected to the same fixing plate (8) at one end. The input end of the high-pressure oil pump (71) is connected to the oil cylinder (7), and the output end is connected to the inside of the main cylinder (4). The main cylinder (4), auxiliary cylinder (6) and oil cylinder (7) are fixedly connected.

3. The multi-pit foundation pit segmented demolition support device according to claim 1, characterized in that: The main cylinder (4) is fixedly connected to a limiting ring (41). The end of the main cylinder (4) away from the fixed plate (8) is sealed and slidably connected to an air storage cylinder (12). The main cylinder (4) is slidably connected to a piston (42). The piston (42) is located between the air storage cylinder (12) and the limiting ring (41), and is also fixedly connected to a push rod (43). The push rod (43) passes through the main cylinder (4), the air storage cylinder (12) and the paddle cylinder (51) in sequence and is fixedly connected to a top plate (3). The push rod (43) is fixedly connected to the air storage cylinder (12). The space between the piston (42) and the air storage cylinder (12) in the main cylinder (4) is set as an air storage chamber (47).

4. The multi-pit foundation pit segmented demolition support device according to claim 3, characterized in that: Both the gas storage chamber (47) and the gas storage cylinder (12) are filled with nitrogen. A limiting plate (48) is fixedly connected to the surface of the gas storage cylinder (12). A slidable cylinder (51) is sealed and slidably connected to the surface of the gas storage cylinder (12). A spring (57) is fixedly connected to one end of the slid cylinder (51). The other end of the spring (57) is fixedly connected to the limiting plate (48). In the initial state, the spring (57) is in a compressed state. Several air guide holes (46) are opened on one side of the gas storage cylinder (12). Several sealing plugs (52) are fixedly connected to the inner side of the slid cylinder (51). The sealing plugs (52) are sealed and inserted into the air guide holes (46).

5. The multi-pit foundation pit segmented demolition support device according to claim 4, characterized in that: The slurry cylinder (51) is sealed and slidably connected with piston two (53). Several high-pressure one-way valves (56) are uniformly fixedly connected to the end of the slurry cylinder (51). The input end of the high-pressure one-way valve (56) is connected to the inside of the slurry cylinder (51), and the output end is fixedly connected to a guide pipe (54). The other end of the guide pipe (54) is fixedly connected to the grouting pipe (55). The end of the grouting pipe (55) passes through the top plate (3) and the base plate (1) in sequence. The grouting pipe (55) is fixedly connected to the top plate (3).

6. The multi-pit foundation pit segmented demolition support device according to claim 5, characterized in that: Two symmetrically arranged limiting strips (44) are fixedly connected to the side of the impeller (51) and the surface of the main cylinder (4), respectively. The limiting strip (44) connected to the impeller (51) is slidably connected to the limiting strip (44) on the surface of the main cylinder (4). Several insertion holes are evenly opened on the surface of the limiting strip (44), and the insertion holes of the two limiting strips (44) are connected to the fixing bolts (45) by internal threads.

7. The multi-pit foundation pit segmented demolition support device according to claim 1, characterized in that: The auxiliary cylinder (6) is slidably connected to a piston three (61), and the auxiliary cylinder (6) is filled with nitrogen. A differential pressure check valve (73) is provided between the auxiliary cylinder (6) and the main cylinder (4). The flow direction of the differential pressure check valve (73) is from the main cylinder (4) to the auxiliary cylinder (6). The input end of the overflow valve (72) is connected to the main cylinder (4), and the output end is connected to the oil cylinder (7). The differential pressure check valve (73) and the overflow valve (72) are both located between the limit ring (41) and the fixed plate (8).

8. The multi-pit foundation pit segmented demolition support device according to claim 1, characterized in that: The substrate (1) has several positioning holes (11) on its surface. The grouting pipe (55) is inserted into the positioning holes (11), and the top plate (3) is detachably connected to the surface of the substrate (1).

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