Earth excavation foundation pit protection device

Abstract

The utility model discloses an earth excavation foundation pit protection device, which belongs to the technical field of foundation pit protection, and comprises a protection plate assembly, a connecting assembly and a supporting structure, the protection plate assembly comprises a mounting plate and extension plates symmetrically arranged on the mounting plate in a sliding manner, and a control mechanism for controlling the extension range is arranged between the two extension plates; the connecting assembly comprises connecting lugs fixedly arranged on the side walls of the extension plates, inserting holes are formed in the centers of the connecting lugs, and the connecting lugs located on the two sides of the extension plates are arranged in an up-down staggered mode, so that the inserting holes can be axially aligned when the two adjacent protection plate assemblies are arranged side by side; the connecting assembly further comprises an inserting rod, and the inserting rod is matched with the inserting hole. The supporting structure is used for supporting the back face of the protection plate assembly. According to the earth excavation foundation pit protection device, the protection plate assemblies can be connected with one another, angle adjustment and locking can be conducted through the splines on the insertion rods, the capacity of bearing shear deformation of the foundation pit between the protection plate assemblies can be improved, and a better supporting effect is provided.

Description

Technical Field

[0001] The utility model belongs to the technical field of foundation pit protection, in particular to a protective device for earthwork excavation foundation pit. Background Art

[0002] The foundation pit is an earth pit excavated at the foundation design location according to the base elevation and foundation plane dimensions. Before excavation, the excavation plan should be decided based on geological and hydrological data and the conditions of nearby buildings on site, and waterproofing and drainage work should be done well. If the excavation is deeper or there are buildings nearby, the foundation pit wall support method can be used to protect and support the inner wall of the foundation pit to reduce the risk of deformation and collapse of the foundation pit edge.

[0003] Existing foundation pit protection devices (such as the stable building foundation pit support device disclosed in CN202322173769.0) are usually independent support plates, the back of which is supported by struts to provide side protection for the foundation pit. However, since the support plates are independent and lack connection with each other, at the corners of the foundation pit, or when the inner surface of the foundation pit is curved or angled, the protection structure can only independently install the support plates at the bending points of the inner wall of the foundation pit. The support plates cannot withstand the shear deformation of the foundation pit, and shear deformation is likely to occur at the intervals between the support plates, resulting in poor support effect. In addition, for curved foundation pits, the support plates with a planar structure have a small contact area with the inner wall of the foundation pit and limited stress points, making it difficult to achieve a good support effect.

[0004] Therefore, we propose an earth excavation pit protection device to solve the above problems. Utility Model Content

[0005] The utility model aims to solve the problem that the protective device in the prior art has poor supporting effect on the inner wall of a non-planar foundation pit, and proposes a protective device for an earthwork excavation foundation pit.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A protective device for earthwork excavation pit, comprising:

[0008] The guard plate assembly comprises a mounting plate and an extension plate symmetrically slidably arranged on the mounting plate, and a control mechanism for controlling the extension range is arranged between the two extension plates;

[0009] The connecting assembly comprises a connecting ear fixedly arranged on the side wall of the extension plate, the center of the connecting ear has a plug hole, and the connecting ears located on both sides of the extension plate are arranged in an up-down staggered manner so that the plug holes of two adjacent guard plate assemblies can be axially aligned when they are side by side;

[0010] The connection assembly also includes an insertion rod, which is adapted to the insertion hole;

[0011] A support structure is used to provide support to the back side of the guard plate assembly.

[0012] Furthermore, the inner wall of the insertion hole is provided with a spline groove, and the outer wall of the insertion rod is provided with a spline matched with the spline groove.

[0013] Furthermore, the bottom of the insertion rod has a puncture portion, and when the insertion rod is inserted into the insertion hole to an extreme position, the puncture portion of the insertion rod exceeds the lower end surface of the guard plate assembly.

[0014] Furthermore, the control mechanism includes a bidirectional threaded tube horizontally rotatably arranged in the middle of the mounting plate, the two ends of the bidirectional threaded tube have internal threads with opposite spiral directions, and the side wall of the extension plate is fixedly mounted with a threaded rod threadedly connected to the bidirectional threaded tube.

[0015] Furthermore, a guide rod is fixedly mounted on one of the side walls of the extension plate, and a guide tube slidably connected to the guide rod is fixedly mounted on the other side wall of the extension plate.

[0016] Furthermore, the outer wall of the mounting plate is provided with a guide strip, and the inner wall of the extension plate is provided with a guide groove matched with the guide strip.

[0017] Furthermore, the support structure comprises a support rod hinged on the back of the mounting plate, and a support plate is rotatably provided at one end of the support rod away from the mounting plate, and a fixing nail is provided in the support plate.

[0018] In summary, the utility model has the following technical effects and advantages:

[0019] 1. The utility model uses the design of connecting ears and plug rods, so that the guard plate components can be connected to each other, and the angle can be adjusted and locked through the splines on the plug rods, which can improve the ability of the guard plate components to withstand the shear deformation of the foundation pit and provide better support effect;

[0020] 2. The guard plate assembly of the utility model can be extended and retracted laterally to adapt to the inner wall of a large-area flat foundation pit and improve construction efficiency. The guard plate can be shortened and adjusted in angle with the insertion rod to better fit the inner wall of the curved foundation pit. It can more flexibly adapt to foundation pits of different shapes and provide a more comprehensive protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 The exploded structure diagram of the guard plate assembly of the utility model Figure 1 ;

[0023] Figure 3 The exploded structure diagram of the guard plate assembly of the utility model is shown in FIG. Figure 2 ;

[0024] Figure 4 for Figure 3 A magnified view of part A;

[0025] Figure 5 It is a schematic diagram of the structure of the connecting ear in the utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the plug rod in the utility model;

[0027] Figure 7 This is a schematic diagram of the structure of the utility model in the use state of the corner of the foundation pit;

[0028] Figure 8 It is a schematic diagram of the structure of the utility model in the use state of the curved surface of the foundation pit.

[0029] In the figure: 1. guard plate assembly; 11. mounting plate; 12. extension plate; 13. bidirectional threaded tube; 14. threaded rod; 15. guide rod; 16. guide tube; 2. connection assembly; 21. connection ear; 22. insertion rod; 23. socket; 24. spline; 25. puncture part; 3. support structure; 31. support rod; 32. support plate; 33. fixing nail. DETAILED DESCRIPTION

[0030] The technical solution of the utility model is clearly and completely described below in conjunction with the accompanying drawings.

[0031] like Figure 1-3 A protective device for an earthwork excavation pit comprises a guard plate assembly 1, a connecting assembly 2 and a supporting structure 3. When protecting the pit, a plurality of guard plate assemblies 1 are used according to the area of ​​the pit. The guard plate assemblies 1 are connected to each other through the connecting assembly 2, and the guard plate assemblies 1 are supported by the supporting structure 3 to realize the protection of the pit.

[0032] The guard plate assembly 1 includes a mounting plate 11 and an extension plate 12 symmetrically slidably arranged on the mounting plate 11. When the two extension plates 12 are laterally displaced along the mounting plate 11, the protection range of the guard plate assembly 1 can be changed to adapt to the inner wall of a large-area flat foundation pit and improve construction efficiency. A guide bar is arranged on the outer wall of the mounting plate 11, and a guide groove matched with the guide bar is arranged on the inner wall of the extension plate 12. The guide groove and the guide bar cooperate to slide to improve the stability of the sliding displacement between the extension plate 12 and the mounting plate 11. A control mechanism for controlling the extension range is arranged between the two extension plates 12. The control mechanism is used to control the reverse movement of the two extension plates 12 to drive the extension plates 12 to open and close.

[0033] like Figure 1-3The control mechanism includes a bidirectional threaded tube 13 which is horizontally rotated and arranged in the middle of the mounting plate 11. Both ends of the bidirectional threaded tube 13 have internal threads with opposite spiral directions. A threaded rod 14 which is threadedly connected to the bidirectional threaded tube 13 is fixedly installed on the side wall of the extension plate 12. By rotating the bidirectional threaded tube 13, the threaded rod 14 is displaced axially along the bidirectional threaded tube 13 under the action of the threads. Since the two sections of the internal threads of the bidirectional threaded tube 13 have opposite spiral directions, when the bidirectional threaded tube 13 rotates, a reverse driving force is applied to the two threaded rods 14 to control the extension plate 12 to extend, thereby realizing the adjustment and control of the support range.

[0034] like Figure 1-3 A guide rod 15 is fixedly installed on the side wall of one extension plate 12, and a guide tube 16 slidably connected to the guide rod 15 is fixedly installed on the side wall of the other extension plate 12. The guide rod 15 and the guide tube 16 cooperate with each other to guide the displacement between the two extension plates 12, thereby improving the displacement accuracy of the extension plates 12.

[0035] The connecting component 2 includes a connecting ear 21 fixedly arranged on the side wall of the extension plate 12, and a socket 23 is provided in the center of the connecting ear 21. The socket 23 is arranged longitudinally, and the connecting ears 21 on both sides of the extension plate 12 are staggered up and down. When the guard plate assemblies 1 are assembled with each other, the connecting ear 21 is staggered and overlapped with the connecting ear 21 on another guard plate assembly 1, so that the sockets 23 of the two adjacent guard plate assemblies 1 can be axially aligned when they are side by side. The connecting component 2 also includes an insert rod 22, which is adapted to the socket 23. After the sockets 23 on the two guard plate assemblies 1 are axially aligned, the insert rod 22 is inserted into the socket 23 to achieve connection, thereby improving the ability of the guard plate assemblies 1 to withstand shear deformation of the foundation pit and providing better support effects.

[0036] like Figure 5-8 The inner wall of the jack 23 is provided with a spline groove, and the outer wall of the plug rod 22 is provided with a spline 24 adapted to the spline groove. In order to adapt to the corner of the foundation pit (such as Figure 7 as shown) and the inner surface has a curved angle (as shown Figure 8 When a foundation pit is formed (as shown in the figure), the two guard plate assemblies 1 can be rotated before the spline 24 is inserted into the spline groove, and the angles between the guard plate assemblies 1 can be adjusted accordingly, so that the guard plate assemblies 1 can fit the inner wall of the foundation pit more closely. After the angle adjustment is completed, the insertion rod 22 is fully inserted into the insertion hole 23, so that the spline 24 is simultaneously engaged with the spline grooves in the two insertion holes 23, thereby realizing the angle locking of the two guard plate assemblies 1.

[0037] like Figure 5-6The bottom of the insertion rod 22 has a puncture portion 25. When the insertion rod 22 is inserted into the insertion hole 23 to the limit position, the puncture portion 25 of the insertion rod 22 exceeds the lower end surface of the guard plate assembly 1. By setting the puncture portion 25, when the spline 24 is inserted into the spline groove, the puncture portion 25 is also inserted into the soil at the bottom of the foundation pit, further improving the lateral supporting force and ensuring the support safety.

[0038] The support structure 3 is used to provide support for the back of the guard plate assembly 1 to improve the support strength of the guard plate assembly 1. The support structure 3 includes a support rod 31 hinged on the back of the mounting plate 11. The support rod 31 is rotatably provided with a support plate 32 at one end away from the mounting plate 11. A fixing nail 33 is provided in the support plate 32. After the guard plate assembly 1 is installed, the support rod 31 is rotated to deflect the support rod 31 downward until the end is against the bottom surface of the foundation pit. The support plate 32 is made to fit with the bottom surface of the foundation pit by rotating the support plate 32, thereby increasing the contact area between the support point and the bottom surface of the foundation pit and the pressure at the position of the foundation pit support point, providing better supporting force. At the same time, the fixing nail 33 penetrates the support plate 32 and is inserted into the bottom surface, which is conducive to stabilizing the position of the support plate 32 and ensuring the supporting effect.

[0039] The working process of this utility model is as follows:

[0040] When in use, first determine the support plan according to the contour of the inner wall of the foundation pit. When supporting a foundation pit with a flat inner wall, rotate the bidirectional threaded tube 13 so that the threaded rod 14 is displaced axially along the bidirectional threaded tube 13 under the action of the threads, and control the extension plate 12 to extend to adapt to the inner wall of the large-area flat foundation pit and improve the construction efficiency. When supporting a foundation pit with a curved surface or a corner, rotate the bidirectional threaded tube 13 in the opposite direction to reduce the width of the guard plate assembly 1 so that it can better fit the inner wall of the curved foundation pit, be more flexibly adapt to foundation pits of different shapes, and provide a more comprehensive protection effect.

[0041] After the adjustment is completed, two adjacent guard plate assemblies 1 are spliced ​​together so that the sockets 23 on the two guard plate assemblies 1 are axially aligned, and the insertion rod 22 is nailed into the soil so that the spline 24 is simultaneously engaged with the spline grooves in the two sockets 23 to achieve angle locking of the two guard plate assemblies 1, thereby increasing the lateral supporting force and ensuring support safety.

[0042] Rotate the support rod 31 to deflect the support rod 31 downward until the end is against the bottom surface of the foundation pit. The support plate 32 is rotated to make the support plate 32 fit with the bottom surface of the foundation pit, thereby increasing the contact area between the support point and the bottom surface of the foundation pit and the pressure at the position of the foundation pit support point, providing better supporting force. At the same time, the fixing nail 33 is inserted through the support plate 32 into the bottom surface, which is conducive to stabilizing the position of the support plate 32 and ensuring the supporting effect.

Claims

1. A protective device for earthwork excavation pit, characterized in that: include: A guard plate assembly (1) comprises a mounting plate (11) and an extension plate (12) symmetrically slidably arranged on the mounting plate (11), wherein a control mechanism for controlling an extension range is arranged between the two extension plates (12); The connecting assembly (2) comprises a connecting ear (21) fixedly arranged on the side wall of the extension plate (12), the center of the connecting ear (21) having a plug hole (23), and the connecting ears (21) located on both sides of the extension plate (12) are arranged in an up-down staggered manner so that the plug holes (23) of two adjacent guard plate assemblies (1) can be axially aligned when they are arranged side by side; The connection assembly (2) further comprises an insertion rod (22), wherein the insertion rod (22) is adapted to fit the insertion hole (23); The support structure (3) is used to provide support for the back side of the guard plate assembly (1).

2. The earthwork excavation pit protection device according to claim 1 is characterized in that: The inner wall of the insertion hole (23) is provided with a spline groove, and the outer wall of the insertion rod (22) is provided with a spline (24) matched with the spline groove.

3. The earthwork excavation pit protection device according to claim 2, characterized in that: The bottom of the insertion rod (22) has a puncture portion (25). When the insertion rod (22) is inserted into the insertion hole (23) to the limit position, the puncture portion (25) of the insertion rod (22) exceeds the lower end surface of the guard plate assembly (1).

4. The earthwork excavation pit protection device according to claim 1, characterized in that: The control mechanism comprises a bidirectional threaded tube (13) which is horizontally rotatably arranged in the middle of the mounting plate (11), the two ends of the bidirectional threaded tube (13) having internal threads with opposite spiral directions, and a threaded rod (14) which is threadedly connected to the bidirectional threaded tube (13) is fixedly mounted on the side wall of the extension plate (12).

5. The earthwork excavation pit protection device according to claim 1, characterized in that: A guide rod (15) is fixedly mounted on the side wall of one of the extension plates (12), and a guide tube (16) slidably connected to the guide rod (15) is fixedly mounted on the side wall of the other extension plate (12).

6. The earthwork excavation pit protection device according to claim 1, characterized in that: The outer wall of the mounting plate (11) is provided with a guide strip, and the inner wall of the extension plate (12) is provided with a guide groove matched with the guide strip.

7. The earthwork excavation pit protection device according to claim 1, characterized in that: The support structure (3) comprises a support rod (31) hinged on the back of the mounting plate (11), and a support plate (32) is rotatably provided at one end of the support rod (31) away from the mounting plate (11), and a fixing nail (33) is provided in the support plate (32).

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