A detection device for preventing collapse of the sidewall of an ultra-deep foundation pit

Abstract

This invention relates to the field of foundation pit collapse prevention detection technology, specifically a detection device for the sidewall collapse prevention of ultra-deep foundation pits. It includes a protective section laid along the sidewall of the ultra-deep foundation pit and a monitoring component installed inside the protective section. The protective section includes a longitudinal fixing beam, with a first fixing part connected to the upper end of the longitudinal fixing beam and fixed to the top of the foundation pit. A second fixing part is disposed at the lower end of the longitudinal fixing beam, extending vertically into the sidewall of the ultra-deep foundation pit. The longitudinal fixing beam is arched, with several support rods disposed on its inner side. Support plates are disposed at the outer ends of the support rods, with the support plates pressing against the sidewall of the ultra-deep foundation pit. The monitoring component includes monitoring sensors disposed inside the support rods for monitoring the deformation of the support rods. This device can directly and in real-time sense minute deformations of the support structure itself, capturing early abnormal information and greatly improving the sensitivity and timeliness of monitoring and early warning.

Description

Technical Field

[0001] This invention relates to the field of foundation pit anti-collapse detection technology, specifically to a detection device for the sidewall anti-collapse of ultra-deep foundation pits. Background Technology

[0002] In urban high-rise building and underground space development projects, ultra-deep foundation pit construction is becoming increasingly common. However, the sidewalls of deep foundation pits are prone to deformation or even collapse during excavation and use, seriously threatening the safety of construction workers and the stability of adjacent buildings and underground pipelines.

[0003] Traditional foundation pit monitoring mainly relies on external displacement measurement points (such as inclinometers and settlement observation points) and ground inspections. These methods have significant time lags, often only being detected when significant deformation of the sidewalls occurs or even when collapse is imminent, resulting in insufficient early warning time. Existing foundation pit sidewalls are often supported using techniques such as retaining walls, soil nails, anchor bolts, or piles. However, for foundation pits with great depth, complex geological conditions, or high environmental requirements, their support effect is poor, and they cannot efficiently detect various locations on the sidewalls of ultra-deep foundation pits.

[0004] Therefore, there is an urgent need for a system that combines support and real-time monitoring functions, has a stable structure, and can sensitively reflect early micro-deformation of the sidewalls, in order to improve the safety and early warning capabilities of ultra-deep foundation pit construction. Summary of the Invention

[0005] To address the above problems, this invention provides a detection device for preventing collapse of the sidewalls of ultra-deep foundation pits.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a detection device for preventing collapse of the sidewall of an ultra-deep foundation pit, comprising a protective part laid along the sidewall of the ultra-deep foundation pit and a monitoring component set inside the protective part. The protective part includes a longitudinal fixing beam, the upper end of the longitudinal fixing beam is connected to a first fixing part, the first fixing part is fixed to the top of the foundation pit, and the lower end of the longitudinal fixing beam is provided with a second fixing part, the second fixing part extending vertically into the interior of the sidewall of the ultra-deep foundation pit.

[0007] The longitudinal fixing beam is arched, and several support rods are provided on the inner side of the longitudinal fixing beam. Support plates are provided on the outer ends of the support rods. The support plates are pressed against the side wall of the ultra-deep foundation pit. The monitoring component includes a monitoring sensor, which is installed inside the support rod and is used to monitor the deformation of the support rod.

[0008] As an optimization, the first fixing part includes a tie rod and a fixing bolt. The tie rod is horizontally connected to the upper end of the longitudinal fixing beam. The tie rod is parallel to and adjacent to the top of the pit. A limit ring is provided at the outer end of the tie rod. The fixing bolt is vertically inserted into the top of the pit from top to bottom through the limit ring.

[0009] As an optimization, an installation hole is opened at the bottom of the sidewall of the foundation pit. The installation hole is used to accommodate the second fixing part. The second fixing part includes a grouting pipe and a reinforcing rod. The reinforcing rod is set inside the grouting pipe and is hollow. Several sets of grouting holes are evenly opened in the length direction of the grouting pipe and the reinforcing rod. When the grouting holes of the grouting pipe and the reinforcing rod are staggered, the length direction of the second fixing part is sealed. When the grouting pipe and the grouting holes of the reinforcing rod are opposite each other, mortar is injected outward into the installation hole through the grouting holes.

[0010] As an optimization, a limiting cavity is formed on the inner side of the outer end of the infusion tube, and a limiting pin is slidably connected inside the limiting cavity. A limiting spring is connected between the limiting cavity and the limiting pin. A limiting groove is formed by the outer side of the reinforcing rod. When the limiting groove and the limiting pin are arranged opposite to each other, the limiting pin extends into the limiting groove to lock the position of the infusion tube and the reinforcing rod.

[0011] As an optimization, a limiting component is provided at the end of the reinforcing rod away from the longitudinal fixed beam. In the initial state, the limiting component is housed inside the grouting pipe. After the mortar is injected, the mortar pushes the reinforcing rod to move to the outside of the grouting pipe, and the limiting component is released outward and inserted into the side wall of the mounting hole.

[0012] As an optimization, the limiting component includes a drive rod and a plurality of limiting rods arranged in a circumferential array. The drive rod is located on the side of the limiting rod closer to the longitudinal fixed beam. A first compression spring is connected between the drive rod and the reinforcing rod, and a second compression spring is connected between the limiting rod and the reinforcing rod. A limiting bracket is arranged between the plurality of limiting rods. The limiting bracket is provided with a limiting protrusion, and the limiting rod is provided with a limiting recess. The limiting protrusion and the limiting recess are arranged opposite to each other. A guide rod is vertically connected to the limiting bracket. A guide block is arranged along the length direction of the drive rod. The guide block includes a guide slope, and one end of the guide rod contacts the guide slope.

[0013] After the limiting component is released from the injection tube, the driving rod is ejected outward by the first compression spring, the guide rod moves along the guide block, causing the limiting bracket to separate from the limiting rod, and the limiting rod is ejected outward under the action of the second compression spring and inserted into the side wall of the mounting hole.

[0014] As an optimization, the outer end of the limiting rod is a pointed tip, and the length of the limiting rod is not less than the distance between the reinforcing rod and the inner wall of the mounting hole;

[0015] In the initial state, the limiting component and the limiting pin are arranged adjacent to each other. When the limiting component is completely released from the inside of the injection tube, the limiting pin extends into the limiting groove, and at the same time, the injection hole of the injection tube and the injection hole of the reinforcing rod are connected.

[0016] As an optimization, a controller is also included, which is connected to the monitoring sensor, including a pressure sensor or a distance sensor, and the support rod is a spring rod.

[0017] As an optimization, several hanging rods are provided on the side of the support plate away from the pit sidewall, and a hanging net is connected between the support plates of two adjacent anti-collapse detection devices, with the edge of the hanging net hanging on the hanging rod.

[0018] The beneficial effects of this plan are as follows:

[0019] The device innovatively integrates the support structure (protective part) with the monitoring components. It is not only a support for the side wall, but its core component (support rod) itself has built-in monitoring sensors that are evenly distributed along the height direction of the ultra-deep foundation pit side wall. It can sense the minute deformation of the support structure itself in real time and directly, capture early abnormal information, and greatly improve the sensitivity of monitoring and the timeliness of early warning.

[0020] The second fixing part extends deep into the bottom of the pit sidewall and achieves a firm bond with the stratum through grout injection. Its unique adjustable injection hole design significantly improves the rigidity and stability of the bottom anchorage, effectively preventing the overall structure from settling or loosening. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the state in use of the present invention.

[0022] Figure 2 This is a front view schematic diagram of the usage state of the present invention.

[0023] Figure 3 For the present invention Figure 2 A schematic diagram of the AA cross-section structure.

[0024] Figure 4 This is an isometric view of the present invention.

[0025] Figure 5 This is a schematic diagram of the isolating component of the present invention.

[0026] Figure 6 For the present invention Figure 3 A magnified structural diagram of part A.

[0027] Among them, 1. longitudinal fixed beam, 2. support rod, 3. support plate, 4. tie rod, 5. fixing bolt, 6. mounting hole, 7. injection pipe, 8. reinforcing rod, 9. injection hole, 10. limiting pin, 11. limiting groove, 12. drive rod, 13. limiting rod, 14. first compression spring, 15. second compression spring, 16. limiting bracket, 17. limiting recess, 18. guide block, 19. guide rod, 20. hanging net, 21. hanging rod. Detailed Implementation

[0028] like Figures 1-6 As shown, a detection device for preventing collapse of the sidewall of an ultra-deep foundation pit includes a protective section laid along the sidewall of the ultra-deep foundation pit and a monitoring component set inside the protective section. The protective section includes a longitudinal fixing beam 1, the upper end of which is connected to a first fixing part, which is fixed to the top of the foundation pit. The lower end of the longitudinal fixing beam 1 is provided with a second fixing part, which extends vertically into the sidewall of the ultra-deep foundation pit.

[0029] The longitudinal fixed beam 1 is arched, and a number of support rods 2 are provided on the inner side of the longitudinal fixed beam 1. The outer end of the support rod 2 is provided with a support plate 3. The support plate 3 is pressed against the side wall of the ultra-deep foundation pit. The monitoring component includes a monitoring sensor, which is set inside the support rod 2 and is used to monitor the deformation of the support rod 2.

[0030] The arched opening of the longitudinal fixed beam 1 is set towards the side wall of the ultra-deep foundation pit, and the longitudinal fixation is set along the height direction of the side wall of the ultra-deep foundation pit, forming a "reinforcement bridge" on the outside of the side wall of the ultra-deep foundation pit, forming the main support frame. The upper and lower ends of the reinforcement bridge are respectively fixed by the first fixed part and the second fixed part.

[0031] Multiple support rods 2 are installed on the side of the longitudinal fixed beam 1. The support rods 2 are connected to the support plates 3. The support plates 3 are squeezed tightly against the side wall of the pit. Multiple support plates 3 are arranged adjacent to each other to improve the support effect and provide efficient support for the height direction of the pit side wall.

[0032] The setting of longitudinal fixed beam 1 can avoid the use of lateral support structure and reduce the footprint inside the foundation pit.

[0033] like Figure 1 As shown, the first fixing part includes a tie rod 4 and a fixing bolt 5. The tie rod 4 is horizontally connected to the upper end of the longitudinal fixing beam 1. The tie rod 4 is parallel and adjacent to the top of the pit. A limit ring is provided at the outer end of the tie rod 4. The fixing bolt 5 is inserted vertically through the limit ring and inserted into the top of the pit from top to bottom.

[0034] Based on the depth of the ultra-deep foundation pit, select tie rods 4 of appropriate length and fix bolts 5 vertically in a geologically stable area to ensure the fixing effect.

[0035] like Figure 3As shown, an installation hole 6 is opened at the bottom of the side wall of the foundation pit. The installation hole 6 is used to accommodate the second fixing part. The second fixing part includes a grouting pipe 7 and a reinforcing rod 8. The reinforcing rod 8 is set inside the grouting pipe 7 and is hollow. Several sets of grouting holes 9 are evenly opened in the length direction of the grouting pipe 7 and the reinforcing rod 8. When the grouting pipe 7 and the grouting holes 9 of the reinforcing rod 8 are staggered, the length direction of the second fixing part is sealed. When the grouting pipe 7 and the grouting holes 9 of the reinforcing rod 8 are opposite to each other, mortar is poured out into the installation hole 6 through the grouting holes 9.

[0036] The end of the grouting pipe 7 connected to the longitudinal fixed beam 1 is open and used for grouting. When the grout is added into the grouting pipe 7, it pushes the reinforcing rod 8 to move deeper until the grouting pipe 7 and the grouting hole 9 of the reinforcing rod 8 are relatively connected.

[0037] like Figure 6 As shown, a limiting cavity is formed on the inner side of the outer end of the infusion tube 7. A limiting pin 10 is slidably connected inside the limiting cavity. A limiting spring is connected between the limiting cavity and the limiting pin 10. A limiting groove 11 is formed by the outer side of the reinforcing rod 8. When the limiting groove 11 and the limiting pin 10 are arranged opposite to each other, the limiting pin 10 extends into the limiting groove 11 to lock the position of the infusion tube 7 and the reinforcing rod 8.

[0038] The limiting pin 10 is used to limit the reinforcing rod 8 and the injection tube 7. When the limiting pin 10 is inserted into the limiting groove 11, the reinforcing rod 8 will no longer be pushed outward.

[0039] like Figure 3 As shown, a limiting component is provided at the end of the reinforcing rod 8 away from the longitudinal fixing beam 1. In the initial state, the limiting component is housed inside the grouting pipe 7. After the mortar is injected, the mortar pushes the reinforcing rod 8 to move to the outside of the grouting pipe 7, and the limiting component is released outward and inserted into the side wall of the mounting hole 6.

[0040] The limiting component is used to limit the reinforcing rod 8 to prevent the second fixed part from being pulled outward by the support rod 2 before mortar is poured.

[0041] like Figures 4-6As shown, the limiting assembly includes a drive rod 12 and a plurality of limiting rods 13 arranged in a circumferential array. The drive rod 12 is located on the side of the limiting rods 13 closer to the longitudinal fixed beam 1. A first compression spring 14 is connected between the drive rod 12 and the reinforcing rod 8. A second compression spring 15 is connected between the limiting rods 13 and the reinforcing rod 8. A limiting bracket 16 is arranged between the plurality of limiting rods 13. The limiting bracket 16 is provided with a limiting protrusion. The limiting rod 13 is provided with a limiting recess 17. The limiting protrusion and the limiting recess 17 are arranged opposite to each other. A guide rod 19 is vertically connected to the limiting bracket 16. A guide block 18 is arranged in the length direction of the drive rod 12. The guide block 18 includes a guide slope. One end of the guide rod 19 is in contact with the guide slope.

[0042] After the limiting component is released from the injection tube 7, the drive rod 12 is ejected outward by the first compression spring 14, the guide rod 19 moves along the guide block 18, causing the limiting bracket 16 to separate from the limiting rod 13, and the limiting rod 13 is ejected outward under the action of the second compression spring 15 and inserted into the side wall of the mounting hole 6.

[0043] The interior of the reinforcing rod 8 is provided with corresponding channels for accommodating the driving rod 12 and the limiting rod 13.

[0044] A third support spring is connected between the limiting component and the interior of the reinforcing rod 8. The third support spring is used to press the limiting bracket 16 so that the limiting bracket 16 limits the multiple limiting rods 13.

[0045] like Figure 5 As shown, there are 3 limiting rods 13, which are arranged end to end. When the limiting bracket 16 separates from the limiting rods 13, the multiple limiting rods 13 extend simultaneously to limit the movement.

[0046] like Figure 5 and Figure 6 As shown, the outer end of the limiting rod 13 is a pointed tip, and the length of the limiting rod 13 is not less than the distance between the reinforcing rod 8 and the inner wall of the mounting hole 6;

[0047] In the initial state, the limiting component and the limiting pin 10 are arranged adjacent to each other. When the limiting component is completely released from the inside of the injection tube 7, the limiting pin 10 extends into the limiting groove, and at the same time, the injection hole 9 of the injection tube 7 is connected to the injection hole 9 of the reinforcing rod 8.

[0048] It also includes a controller, which is connected to the monitoring sensor, which includes a pressure sensor or a distance sensor, and the support rod 2 is a spring rod.

[0049] like Figure 1As shown, a number of hanging rods 21 are provided on the side of the support plate 3 away from the side wall of the foundation pit. A hanging net 20 is connected between the support plates 3 of two adjacent anti-collapse detection devices, and the edge of the hanging net 20 is hung on the hanging rod 21.

[0050] Multiple anti-collapse detection devices can be installed at intervals, and the pit sidewalls between adjacent anti-collapse detection devices can be protected by hanging netting 20.

[0051] How to use:

[0052] Foundation pit preparation work:

[0053] Drill a vertical hole at the bottom of the sidewall of the foundation pit (corresponding to installation hole 6), with a diameter slightly larger than the second fixing part and a depth that meets the anchoring requirements;

[0054] Top-mounted installation:

[0055] The longitudinal fixed beam 1 is hoisted to the predetermined position on the side wall of the pit and extended to the stable area on the top surface of the pit by the tie rod 4. The fixing bolt 5 is used to penetrate the limiting ring and anchor it to the top surface.

[0056] Bottom anchor mechanism installation:

[0057] Insert the second fixing part into the bottom mounting hole 6. At this time, the second fixing part is in the initial state: the injection tube 7 and the injection hole 9 of the reinforcing rod 8 are misaligned and sealed. At this time, the limiting component is compressed and stored inside the injection tube 7, and the limiting pin 10 does not enter the groove of the reinforcing rod 8.

[0058] High-pressure mortar is injected into the injection pipe 7. The high-pressure mortar pushes the reinforcing rod 8 to move towards the bottom of the hole. When the reinforcing rod 8 is in place: the inner and outer injection holes 9 are aligned, and the mortar is injected into the gap of the installation hole 6 through the injection hole 9. The limiting pin 10 slides into the limiting groove 11 to lock the position of the pipe rod.

[0059] Simultaneously, the linkage triggers the limiting component, the drive rod 12 is ejected by the first compression spring 14, the guide rod 19 moves along the inclined surface of the guide block 18, pushing the limiting bracket 16 to separate from the limiting rod 13, and the second compression spring 15 instantly ejects 3 limiting rods 13 to pierce the hole wall, forming a barbed three-dimensional anchoring system.

[0060] After a protective netting 20 is installed between two adjacent support plates 3 in the horizontal direction, the sensor embedded in the support rod 2 is activated, and the controller collects pressure / displacement data at each point in real time and sets a threshold alarm function to monitor early deformation.

[0061] The above-described specific embodiments are merely specific examples of the present invention. The patent protection scope of the present invention includes, but is not limited to, the product form and style of the above-described specific embodiments. Any ultra-deep foundation pit sidewall anti-collapse detection device that conforms to the claims of the present invention, and any appropriate changes or modifications made to it by those skilled in the art, shall fall within the patent protection scope of the present invention.

Claims

1. A kind of super deep foundation pit side wall anti-collapse detection device, it is characterized by: The utility model relates to a kind of monitoring assembly for super deep foundation pit, including the protection part laid along the side wall of super deep foundation pit and the monitoring component arranged in the protection part, the protection part includes longitudinal fixed beam (1), the upper end of the longitudinal fixed beam (1) is connected with first fixed part, the first fixed part is fixed to the top of foundation pit, the lower end of the longitudinal fixed beam (1) is equipped with second fixed part, the second fixed part is vertically extended into the inside of the side wall of super deep foundation pit. The longitudinal fixed beam (1) is arched, the inside of the longitudinal fixed beam (1) is provided with a plurality of support rods (2), the outer end of the support rod (2) is equipped with support plate (3), the support plate (3) is tightly pressed to the side wall of super deep foundation pit, the monitoring component includes monitoring sensor, the monitoring sensor is arranged in the inside of the support rod (2), for monitoring the deformation of the support rod (2). Mounting hole (6) is opened in the bottom of the side wall of foundation pit, the mounting hole (6) is used to accommodate the second fixed part, the second fixed part includes grouting pipe (7) and reinforcing rod (8), the reinforcing rod (8) is arranged in the inside of grouting pipe (7), the reinforcing rod (8) is hollow, the grouting pipe (7) and the reinforcing rod (8) are evenly provided with a plurality of groups of grouting holes (9) in length direction, when the grouting hole (9) of the grouting pipe (7) and reinforcing rod (8) is staggered, the length direction of the second fixed part is in sealed state, when the grouting hole (9) of the grouting pipe (7) and reinforcing rod (8) is opposite, mortar is grouted to the mounting hole (6) outside through grouting hole (9). The inside of the outer end of the grouting pipe (7) is provided with a limiting cavity, the inside of the limiting cavity is slidably connected with a limiting pin (10), a limiting spring is connected between the limiting cavity and the limiting pin (10), the outer side of the reinforcing rod (8) is recessed to form a limiting groove (11), when the limiting groove (11) and the limiting pin (10) are opposite, the limiting pin (10) is inserted into the inside of the limiting groove (11), the position of the grouting pipe (7) and the reinforcing rod (8) is locked. The end of the reinforcing rod (8) away from the longitudinal fixed beam (1) is equipped with a limiting assembly, in initial state, the limiting assembly is accommodated in the inside of the grouting pipe (7), after grouting mortar, the mortar pushes the reinforcing rod (8) to move to the outside of the grouting pipe (7), the limiting assembly is released outward, and is inserted into the side wall of the mounting hole (6). The limiting assembly comprises a driving rod (12) and a plurality of limiting rods (13) arranged in a circumferential array, the driving rod (12) is located on the side of the limiting rod (13) close to the longitudinal fixed beam (1), a first compression spring (14) is connected between the driving rod (12) and the reinforcing rod (8), a second compression spring (15) is connected between the limiting rod (13) and the reinforcing rod (8), a limiting support (16) is arranged between a plurality of limiting rods (13), the limiting support (16) is provided with a limiting protrusion, the limiting rod (13) is provided with a limiting recess (17), the limiting protrusion and the limiting recess (17) are oppositely arranged, the limiting support (16) is vertically connected with a guide rod (19), the guide block (18) is arranged in the length direction of the driving rod (12), the guide block (18) comprises a guide slope, one end of the guide rod (19) is in contact with the guide slope; After the limiting assembly is released from the perfusion pipe (7), the driving rod (12) is ejected outward by the first compression spring (14), the guide rod (19) moves along the guide block (18), so that the limiting support (16) is separated from the limiting rod (13), and the limiting rod (13) is ejected outward under the action of the second compression spring (15) and is inserted into the side wall of the mounting hole (6).

2. The collapse-preventing detection device for the sidewall of an ultra-deep foundation pit according to claim 1, characterized in that: The first fixed part comprises a pull rod (4) and a fixed bolt (5), the pull rod (4) is horizontally connected to the upper end of the longitudinal fixed beam (1), the pull rod (4) is arranged in parallel and adjacent to the top of the foundation pit, the outer end of the pull rod (4) is provided with a limiting ring, and the fixed bolt (5) is vertically inserted into the top of the foundation pit from top to bottom through the limiting ring.

3. The collapse-preventing detection device for the sidewall of an ultra-deep foundation pit according to claim 1, characterized in that: The outer end of the limiting rod (13) is a pointed end, and the length of the limiting rod (13) is not less than the distance between the reinforcing rod (8) and the inner wall of the mounting hole (6); In the initial state, the limiting assembly is arranged adjacent to the limiting pin (10), when the limiting assembly is completely released from the inside of the perfusion pipe (7), the limiting pin (10) extends into the limiting groove, and the perfusion hole (9) of the perfusion pipe (7) is in communication with the perfusion hole (9) of the reinforcing rod (8).

4. The collapse-preventing detection device for the sidewall of an ultra-deep foundation pit according to claim 1, characterized in that: Further comprising a controller connected with the monitoring sensor, the monitoring sensor comprises a pressure sensor or a distance sensor, and the support rod (2) is a spring rod.

5. The collapse-preventing detection device for the sidewall of an ultra-deep foundation pit according to claim 1, characterized in that: The side of the support plate (3) away from the side wall of the foundation pit is provided with a plurality of hanging rods (21), and the support plates (3) of two adjacent anti-collapse detection devices are connected with a hanging net (20), and the edges of the hanging net (20) are hung on the hanging rods (21).

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