Geotechnical engineering foundation pit anti-collapse supporting device and using method thereof

Abstract

The invention discloses a geotechnical engineering foundation pit collapse prevention supporting device and a using method thereof, and belongs to the field of geotechnical engineering construction devices. Comprising a plurality of supporting plates and connecting devices located between every two adjacent supporting plates. The connecting device comprises a fixed cylinder; the fixing cylinder is fixedly connected to one side of the supporting plate, and an arc-shaped groove is formed in the other side of the supporting plate. The arc-shaped grooves are attached to the outer circle faces of the adjacent fixing cylinders. A rotating shaft connected through a bearing is arranged in the fixed cylinder; a vertical through hole is formed in the rotating shaft; a vertical through hole is formed in the upper end of the side, provided with the arc-shaped groove, of the supporting plate, and an L-shaped connecting rod in sliding fit with the through hole is arranged in the through hole. And the horizontal end of the connecting rod is fixedly connected with a rectangular insertion rod which is in sliding fit with the through hole. The arc-shaped grooves in the side faces of the supporting plates abut against the adjacent fixing cylinders to prevent water and soil from permeating into the foundation pit, and the two adjacent supporting plates can rotate relatively to adapt to the shape of the inner wall of the foundation pit conveniently.

Description

Technical Field

[0001] The present invention relates to a support device for preventing the collapse of a foundation pit in geotechnical engineering and its using method, belonging to the field of geotechnical engineering construction devices. Background Technique

[0002] In the construction of foundation pit projects, sheet pile support or row pile support is usually adopted for edge support. However, in actual application, due to the influence of the splicing method of the support structure, gaps are likely to occur at the corners, convex or concave parts of the inner wall of the foundation pit. These gaps will cause groundwater leakage or soil loss, thus affecting the stability and construction safety of the foundation pit.

[0003] At present, for such problems, common solutions are to add auxiliary anti-seepage measures such as geotextiles and waterproof membranes outside the support structure, or to inject grout to seal the gaps. However, these methods not only increase the construction procedures and costs, but also have limited effects under complex geological conditions and are difficult to completely avoid the leakage risk.

[0004] Therefore, it is necessary to optimize and improve it to improve its sealing performance and adaptability. Summary of the Invention

[0005] The purpose of the present invention is to provide a support device for preventing the collapse of a foundation pit in geotechnical engineering and its using method to solve the above problems existing in the background technique.

[0006] The present invention achieves the above purpose and adopts the following technical solutions:

[0007] A support device for preventing the collapse of a foundation pit in geotechnical engineering includes a plurality of support plates and a connecting device located between two adjacent support plates; the connecting device includes a fixed cylinder; the fixed cylinder is fixedly connected to one side of the support plate, and an arc-shaped groove is provided on the other side of the support plate; the arc-shaped groove fits with the outer circular surface of the adjacent fixed cylinder; a rotating shaft connected by a bearing is provided inside the fixed cylinder; a vertical through hole is provided on the rotating shaft; a vertical through hole is provided at the upper end of the side of the support plate with the arc-shaped groove, and an L-shaped connecting rod slidably matched with it is provided in the through hole; a rectangular inserting rod slidably matched with the through hole is fixedly connected to the horizontal end of the connecting rod.

[0008] A using method of a support device for preventing the collapse of a foundation pit in geotechnical engineering, the using method includes the following steps:

[0009] Step 1: After lifting the support plate and moving it to a predetermined position, install it.

[0010] Step 2: Install a support plate into the foundation pit. When the subsequently installed support plate is moved to the bottom surface of the foundation pit, by pulling the support plate, the support plate drives the connecting rod and the inserting rod to move, thereby driving the inserting rod to move in the perforation towards the direction of the axis rod center line, so as to leave a gap between the support plate and the outer wall of the fixed cylinder for adjusting the angle of the subsequent support plate;

[0011] Step 3: Rotate the support plate to a predetermined position;

[0012] Step 4: Then push the support plate to drive the corresponding inserting rod to move in a direction away from the axis rod center line, and push the outer shell and the triangular prism to move, so that the triangular prism slides into the corresponding card slot to limit the rotation of the support plate, and then install it into the foundation pit;

[0013] Step 5: Screw a bolt onto the limit block so that the bolt abuts against the side surface of the inserting rod to limit the sliding of the inserting rod in the perforation; then repeat Step 2 until all the support plates are installed;

[0014] Step 6: Install support rods or beams on the side surfaces of single or multiple support plates as required.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention can not only prevent water and soil from seeping into the foundation pit by the arc-shaped groove on the side surface of the support plate abutting against the adjacent fixed cylinder, but also two adjacent support plates can rotate relative to each other, which is convenient for adapting to the shape of the inner wall of the foundation pit. Description of the Drawings

[0016] Figure 1 is a three-dimensional structure diagram of a soil engineering foundation pit anti-collapse support device of the present invention;

[0017] Figure 2 is a three-dimensional structure diagram of the support plate of a soil engineering foundation pit anti-collapse support device of the present invention after rotation;

[0018] Figure 3 is a cross-sectional view of the support plate of a soil engineering foundation pit anti-collapse support device of the present invention;

[0019] Figure 4 is Figure 3 the enlarged structure diagram of A in

[0020] Figure 5 is Figure 4 the cross-sectional view in the B-B direction in

[0021] Figure 6 is a top view of the support plate of a soil engineering foundation pit anti-collapse support device of the present invention in a rotatable state;

[0022] Figure 7It is a top view of the anti-seepage state of a support plate of a geotechnical engineering foundation pit anti-collapse support device of the present invention;

[0023] Figure 8 It is a top view of the anti-seepage state of a support plate of a geotechnical engineering foundation pit anti-collapse support device of the present invention after rotation. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] Specific implementation method 1: Figure 1-8 As shown, this embodiment records a geotechnical engineering foundation pit anti-collapse support device, including a plurality of support plates 1 and a connecting device 2 located between two adjacent support plates 1; the connecting device 2 includes a fixing cylinder 21; the fixing cylinder 21 is fixedly connected to one side of the support plate 1, and an arc groove 12 is provided on the other side of the support plate 1; the arc groove 12 fits with the outer circumferential surface of the adjacent fixing cylinder 21; a rotating shaft 22 connected by a bearing is provided inside the fixing cylinder 21; a vertical through hole 23 is provided on the rotating shaft 22; a vertical through hole is provided on the upper end of one side of the support plate 1 provided with the arc groove 12, and an L-shaped connecting rod 11 slidably matched therewith is provided in the through hole; a rectangular plug rod 13 slidably matched with the through hole 23 is fixedly connected to the horizontal end of the connecting rod 11.

[0026] The outer diameter of the fixing tube 21 is greater than the thickness of the supporting plate 1. The arc groove 12 on the side of the supporting plate 1 can still be close to the outer circumferential surface of the fixing tube 21 after the supporting plate 1 rotates 90 degrees, so as to adapt to the shape of the inner wall of the foundation pit and avoid leakage.

[0027] The length of the fixing tube 21 is equal to the height of the supporting plate 1 , so that the protection height of the fixing tube 21 is the same as the protection height of the supporting plate 1 .

[0028] The through hole 23 penetrates the rotating shaft 22 transversely from the center of the rotating shaft 22 along the setting direction of one of the diameters of the cross section of the rotating shaft 22. The insertion rod 13 in the through hole 23 can slide in the through hole 23 to adjust the distance between the two supporting plates 1. When the distance between the supporting plates 1 is increased, it is convenient to rotate the supporting plates 1 to adjust the angle. When the distance between the supporting plates 1 is reduced, the arc groove 12 of the supporting plate 1 can be close to the outer circumferential surface of the fixing tube 21 to prevent leakage.

[0029] When the insertion rod 13 is located at one end of the through hole 23 close to the center of the rotating shaft 22, there is a gap for the relative rotation of two adjacent support plates 1 between the arc-shaped groove 12 on the support plate 1 connected to the insertion rod 13 and the fixing cylinder 21 closest to the arc-shaped groove 12.

[0030] An arc-shaped rod 28 is fixedly connected to the inner wall of the through hole 23 at one end close to the inner circular surface of the fixing cylinder 21; a sleeve 27 is arranged on the outer side of the arc-shaped rod 28 and is in sliding fit with the arc-shaped rod 28; the lower end of the sleeve 27 is fixedly connected with a slider 210, the slider 210 is in sliding fit with a limiting rod 29 fixedly connected to the inner wall of the outer shell 25, and a spring 211 sleeved on the limiting rod 29 is arranged between the slider 210 and the outer shell 25; one end of the outer shell 25 facing the inner wall of the fixing cylinder 21 is provided with a triangular prism 24; a plurality of clamping grooves 215 are arranged on the inner wall of the fixing cylinder 21; the triangular prism 24 is in sliding fit with any one of the clamping grooves 215.

[0031] The cross section of the clamping groove 215 is triangular and matches the shape of the triangular prism 24.

[0032] The through hole 23 communicates with a plurality of adjacent clamping grooves 215.

[0033] When the shaft rod 22 rotates relative to the fixing cylinder 21, the shaft rod 22 drives the triangular prism 24 to rotate together. After rotating to a preset angle and stopping, the triangular prism 24 can rotate relative to the arc-shaped rod 28 through the sleeve 210, so that the triangular prism 24 can be smoothly inserted into one of the clamping grooves 215 communicated with the through hole 23, so as to limit the large-angle rotation of the shaft rod 22.

[0034] The central angle corresponding to the arc-shaped rod 28 is less than 3°. Further, it is ensured that after the triangular prism 24 is embedded inside the clamping groove 215, the shaft rod 22 can only rotate within the range of the central angle corresponding to the arc-shaped rod 28. The function of the support plate 1 is to support. At the concave and convex parts or the corner parts of the inner wall of the foundation pit, it is allowed that there is an error in the angle after the support plates 1 are spliced (for example, at the corner part of the inner wall of the foundation pit, the included angle between two support plates 1 after splicing is 85-95° and does not affect the support effect of the support plate 1).

[0035] An air bag 214 is fixedly connected to the side surface of the insertion rod 13; when the insertion rod 13 moves in the through hole 23 in a direction away from the center line of the shaft rod 22, the air bag 214 contacts the outer shell 25 and pushes the outer shell 25 and the triangular prism 24 to move in the direction of the clamping groove 215. When the triangular prism 24 drives the outer shell 25 to rotate relative to the arc-shaped rod 28, the air bag 214 can keep in full contact with the outer shell 25. The air bag 214 is filled with air for the air bag 214 to expand but without elastic deformation volume.

[0036] The arc-shaped rod 28 is concentric with the shaft rod 22. During the process of rotating the housing 25 and the triangular prism 24 around the arc-shaped rod 28 to any position, the triangular prism 24 can be inserted into the corresponding card slot 215.

[0037] A limit block 212 is fixedly connected to the upper end of the shaft rod 22, and a bolt 213 is threaded on the limit block 212; when the three-piece block 24 slides into the corresponding card slot 215, the bolt 213 abuts against the insertion rod 13 to restrict its movement.

[0038] A usage method of a support device for preventing the collapse of a foundation pit in geotechnical engineering, the usage method comprising the following steps:

[0039] Step 1: After lifting the support plate 1 and moving it to a predetermined position, install it.

[0040] Step 2: Install a support plate 1 into the foundation pit. When the subsequently installed support plate 1 is moved to the bottom surface of the foundation pit, by pulling the support plate 1, the support plate 1 drives the connecting rod 11 and the insertion rod 13 to move, and then drives the insertion rod 13 to move in the through hole 23 in the direction of the center line of the shaft rod 22, so as to leave a gap between the support plate 1 and the outer wall of the fixed cylinder 21 for the subsequent adjustment of the angle of the support plate 1.

[0041] Step 3: Rotate the support plate 1 to a predetermined position.

[0042] Step 4: Then push the support plate 1 to drive the corresponding insertion rod 13 to move in a direction away from the center line of the shaft rod 22, and push the housing 25 and the triangular prism 24 to move, so that the triangular prism 24 slides into the corresponding card slot 215 to restrict the rotation of the support plate 1, and then install it into the foundation pit.

[0043] Step 5: Screw the bolt 213 into the limit block 212 so that the bolt 213 abuts against the side surface of the insertion rod 13 to restrict the sliding of the insertion rod 13 in the through hole 23; then repeat Step 2 until all the support plates 1 are installed.

[0044] Step 6: Install the support rods 3 or beams on the side surfaces of one or more support plates 1 as needed.

[0045] The working principle of the present invention is: when using this device, after lifting the support plate 1 and moving it to a predetermined position, install it.

[0046] The first support plate 1 is installed into the foundation pit, and the insertion rod 13 on the support plate 1 to be installed is inserted into the through hole 23 on the side connection device 2 of the installed support plate 1. When it is moved to the bottom surface of the foundation pit, the support plate 1 to be installed is pulled to move in the direction away from the installed support plate 1, and the connecting rod 11 and the insertion rod 13 are driven to move, and then the insertion rod 13 is driven to move in the through hole 23 in the direction of the center line of the shaft rod 22, so that a gap is left between the support plate 1 to be installed and the outer wall of the fixing tube 21, so as to adjust the angle between the support plate 1 to be installed and the installed support plate 1, so as to adapt to the shape of the inner wall of the foundation pit;

[0047] When the support plate 1 to be installed is rotated, the support plate 1 drives the connecting rod 11 and the insertion rod 13 to rotate together during the rotation process. Since the insertion rod 13 has a rectangular cross section, the insertion rod 13 drives the shaft rod 22 to rotate together through the through hole 23 during the rotation process until the support plate 1 is rotated to a predetermined position;

[0048] Then, the support plate 1 to be installed is pushed, so that it drives the corresponding insertion rod 13 to move along the through hole 23 in the direction away from the center line of the shaft rod 22. During the movement, the insertion rod 13 contacts the shell 25 and pushes the shell 25 and the triangular prism 24 to move. The shell 25 compresses the spring 211, so that the triangular prism 24 slides into the corresponding slot 215 to limit the large-angle rotation of the support plate 1, so as to avoid the support plate 1 not being able to fit the shape of the inner wall of the foundation pit after splicing, and finally install it into the foundation pit;

[0049] The bolt 213 is screwed into the limit block 212 so that the bolt 213 is close to the side of the insertion rod 13 to limit the insertion rod 13 from sliding in the through hole 23, so that the insertion rod 13 cannot move toward the center line of the shaft 22, and then the insertion rod 13 presses the housing 25 and the triangular prism 24 against the corresponding slot 215 to prevent them from being separated from the slot 215; then repeat the above operation until the support plate 1 is completely installed;

[0050] Finally, support rods 3 or beams are installed on the sides of the single or multiple support panels 1 as needed.

[0051] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms of assembly without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0052] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A geotechnical engineering foundation pit anti-collapse support device, characterized in that: The invention comprises a plurality of support plates (1) and a connecting device (2) located between two adjacent support plates (1); the connecting device (2) comprises a fixing tube (21); the fixing tube (21) is fixedly connected to one side of the support plate (1), and the other side of the support plate (1) is provided with an arc groove (12); the arc groove (12) is fitted with the outer circumferential surface of the adjacent fixing tube (21); a rotating shaft (22) connected via a bearing is provided inside the fixing tube (21); a vertical through hole (23) is provided on the rotating shaft (22); a vertical through hole is provided on the upper end of one side of the support plate (1) provided with the arc groove (12), and an L-shaped connecting rod (11) slidably matched therewith is provided in the through hole; a rectangular plug rod (13) slidably matched with the through hole (23) is fixedly connected to the horizontal end of the connecting rod (11).

2. The anti-collapse support device for a geotechnical engineering foundation pit according to claim 1, characterized in that: The outer diameter of the fixing tube (21) is greater than the thickness of the supporting plate (1).

3. A geotechnical engineering foundation pit anti-collapse support device according to claim 2, characterized in that: The length of the fixing tube (21) is equal to the height of the supporting plate (1).

4. The anti-collapse support device for a geotechnical engineering foundation pit according to claim 1, characterized in that: The through hole (23) penetrates the rotating shaft (22) transversely from the center of the rotating shaft (22) along the setting direction of one of the diameters of the cross section of the rotating shaft (22).

5. The anti-collapse support device for a geotechnical engineering foundation pit according to claim 4, characterized in that: When the insertion rod (13) is located at one end of the through hole (23) close to the center of the rotating shaft (22), a gap is left between the arc groove (12) on the supporting plate (1) connected to the insertion rod (13) and the fixed cylinder (21) closest to the arc groove (12) to allow two adjacent supporting plates (1) to rotate relative to each other.

6. The anti-collapse support device for a geotechnical engineering foundation pit according to claim 5, characterized in that: An arc rod (28) is fixedly connected to the inner wall of the through hole (23) near one end of the inner circular surface of the fixed cylinder (21); a sleeve (27) slidably matched with the arc rod (28) is provided on the outer side of the arc rod (28); a slider (210) is fixedly connected to the lower end of the sleeve (27); the slider (210) slidably matches with a limit rod (29) fixedly connected to the inner wall of the shell (25), and a spring (211) sleeved on the limit rod (29) is provided between the slider (210) and the shell (25); a triangular prism (24) is provided at one end of the shell (25) facing the inner wall of the fixed cylinder (21); a plurality of slots (215) are provided on the inner wall of the fixed cylinder (21); and the triangular prism (24) slidably matches with any one of the slots (215).

7. A geotechnical engineering foundation pit anti-collapse support device according to claim 6, characterized in that: The side surface of the insertion rod (13) is fixedly connected with an air bag (214); when the insertion rod (13) moves in the through hole (23) in a direction away from the center line of the shaft rod (22), the air bag (214) contacts the shell (25) and pushes the shell (25) and the triangular prism (24) to move in the direction of the slot (215).

8. The anti-collapse support device for a geotechnical engineering foundation pit according to claim 7, characterized in that: The arc-shaped rod (28) is concentric with the shaft rod (22).

9. The anti-collapse support device for a geotechnical engineering foundation pit according to claim 8, characterized in that: The upper end of the shaft rod (22) is fixedly connected to a limit block (212), and a bolt (213) is threaded on the limit block (212); when the three blocks (24) slide into the corresponding slots (215), the bolt (213) abuts against the insertion rod (13) to limit its movement.

10. The method for using the anti-collapse support device for a geotechnical engineering foundation pit according to claim 9, characterized in that: The method of use comprises the following steps: Step 1: After lifting and moving the support plate (1) to a predetermined position, installing it; Step 2: Install a support plate (1) into the foundation pit. When the support plate (1) installed later is moved to the bottom surface of the foundation pit, the support plate (1) is pulled to drive the connecting rod (11) and the insertion rod (13) to move, thereby driving the insertion rod (13) to move in the through hole (23) in the direction of the center line of the shaft rod (22), so that a gap is left between the support plate (1) and the outer wall of the fixing tube (21) for the subsequent support plate (1) to adjust the angle; Step 3: rotating the support plate (1) to a predetermined position; Step 4: Then push the support plate (1) to drive the corresponding plug rod (13) to move away from the center line of the shaft (22), and push the housing (25) and the triangular prism (24) to move, so that the triangular prism (24) slides into the corresponding slot (215) to limit the rotation of the support plate (1), and then install it into the foundation pit; Step 5: Screw the bolt (213) into the limit block (212) so that the bolt (213) is close to the side of the insertion rod (13) to limit the insertion rod (13) from sliding in the through hole (23); then repeat step 2 until the support plate (1) is completely installed; Step 6: Install supporting rods (3) or beams on the sides of a single or multiple supporting plates (1) as needed.

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