Supporting system for displacement control of half-cover excavation foundation pit

Abstract

The utility model relates to the technical field of foundation pit construction equipment, and discloses a supporting system for displacement control of a half-cover excavation foundation pit, which comprises two cross beams, each cross beam is provided with a supporting frame, the supporting frames are U-shaped, and the two supporting frames are connected in a sliding manner; a hydraulic cylinder is arranged on the inner side of one supporting frame, a one-way positioning rack is arranged on the hydraulic cylinder, the telescopic end of the hydraulic cylinder is connected with the other supporting frame, a supporting frame is movably arranged at one end of the hydraulic cylinder, an adjusting plate is hinged to the other end of the hydraulic cylinder, and the bottom end of the adjusting plate is hinged to the telescopic end of the hydraulic cylinder. A positioning ratchet is elastically arranged on the support frame; a connecting rod is hinged to the supporting frame and hinged to the adjusting plate. The hydraulic cylinder supporting device can assist the hydraulic cylinder in positioning and supporting and effectively share part of counter-acting force acting on the hydraulic cylinder, the stability of a supporting system is guaranteed, meanwhile, potential threats to the hydraulic cylinder are reduced, and the service life of the hydraulic cylinder is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit construction equipment technology, and in particular to a support system for displacement control of a semi-covered excavation foundation pit. Background Technology

[0002] An excavation pit is a pit dug according to the foundation design location, base elevation, and foundation plan dimensions. The soil layers on the pit's sidewalls are highly susceptible to movement towards the pit under gravity; therefore, retaining walls are often installed on the pit's sidewalls to prevent this movement. In actual construction, in addition to retaining walls, supporting structures are often installed on-site to provide support for the retaining walls, thereby preventing deformation and displacement of the retaining walls under soil pressure.

[0003] Utility model patent with authorization announcement number CN220978044U discloses a support system for displacement control of a semi-covered excavation pit. Specifically, it includes two mounting beams, one of which has a first connecting frame mounted on it. The first connecting frame is connected to a first connecting plate, and the first connecting plate is connected to two connecting beams. The ends of the two connecting beams are connected to a second connecting plate. The other mounting beam has a second connecting frame mounted on it. A displacement compensation mechanism is provided between the two connecting beams. The displacement compensation mechanism drives the second connecting frame. The displacement compensation mechanism is a hydraulic cylinder. An output shaft is provided between the two mounting beams, passing through the second connecting plate and driving the hydraulic cylinder of the second connecting frame.

[0004] The above scheme uses the extension and retraction of hydraulic cylinders to achieve local structural deformation compensation, thereby eliminating the deformation and displacement of the excavation pit and maintaining its stability. The degree of compensation is easy to control. However, during operation, the external force exerted by the excavation pit deformation relies entirely on the thrust of the hydraulic cylinders to distribute and bear the load, making stability difficult to guarantee. Furthermore, it is prone to causing cracks in weak parts of the hydraulic cylinder structure, leading to mechanical damage and affecting its service life. Therefore, there is an urgent need for a support system for controlling the displacement of semi-cut excavation pits that can assist the hydraulic cylinders in positioning and share some of the forces acting on them. Utility Model Content

[0005] The purpose of this invention is to provide a support system for displacement control of a semi-covered excavation pit, which can assist the hydraulic cylinder in positioning and support, and effectively share part of the reaction force acting on the hydraulic cylinder, ensuring the stability of the support system while reducing potential threats to the hydraulic cylinder and ensuring the service life of the hydraulic cylinder.

[0006] The present invention adopts the following technical solution:

[0007] A support system for displacement control of a semi-excavated foundation pit includes two crossbeams at the ends, each crossbeam having a support frame. The support frames are U-shaped and slidably connected. A hydraulic cylinder is installed on the inner side of one of the support frames, and a one-way positioning rack is installed on it. The telescopic end of the hydraulic cylinder is connected to the other support frame, and a support frame is movably mounted on one end of the hydraulic cylinder, while an adjusting plate is hinged to the other end. The bottom end of the adjusting plate is hinged to the telescopic end of the hydraulic cylinder. A positioning ratchet is elastically provided on the support frame. A connecting rod is hinged to the support frame and is hinged to the adjusting plate. In the initial state, both the adjusting plate and the support frame are tilted, and the positioning ratchet is disengaged from the one-way positioning rack.

[0008] Preferably, a groove is provided on the outer side wall of the support frame where the hydraulic cylinder is located along its length, and a slider is provided on the inner side wall of the support frame to which the telescopic end of the hydraulic cylinder is connected, and the slider slides within the groove.

[0009] Preferably, the one-way positioning rack is disposed on the outer side of the bottom of the slide groove, and a roller is movably disposed on the slider, the roller being located in the slide groove inside the one-way positioning rack.

[0010] Preferably, a support beam is fixedly provided on the support frame where the adjusting plate is located, a limiting frame is fixedly provided on the support beam, a limiting plate is provided at the telescopic end of the hydraulic cylinder, the adjusting plate is hinged to the limiting plate, and in the initial state, the limiting plate abuts against the limiting frame, at which time the adjusting plate is in an inclined state.

[0011] Preferably, the supporting crossbeam has a hinge groove, the adjusting plate is hinged in the hinge groove, and the width of the limiting plate is greater than the width of the hinge groove; when the adjusting plate is in the vertical state during operation, the limiting plate abuts against the supporting crossbeam.

[0012] Preferably, each end of the support frame is provided with an L-shaped connecting plate, and a U-shaped support frame is fixedly provided on the crossbeam, forming a connecting groove between the support frame and the crossbeam for hanging the connecting plate.

[0013] Preferably, a buffer pad is provided on the outer side of the connecting plate.

[0014] Preferably, a hanger is provided on the crossbeam, and a support column is provided at the bottom of the crossbeam.

[0015] Preferably, the crossbeam is an H-shaped steel beam, and the hanger rod is hinged in the groove at the top of the crossbeam.

[0016] Preferably, an auxiliary diagonal brace is hinged to the side wall of the beam, and the auxiliary diagonal brace is detachably connected to the support frame.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model, by slidingly connecting two support frames and setting a one-way positioning rack on one support frame and a positioning ratchet elastically set on the other support frame, can push the tilted adjustment plate to a vertical state when the hydraulic cylinder extends. The connecting rod then drives the support frame to swing, achieving contact between the positioning ratchet and the one-way positioning rack, thereby realizing the positioning operation between the two support frames. This effectively alleviates the force exerted on the hydraulic cylinder by the deformation of the pit sidewall, reducing the adverse effects on the hydraulic cylinder. Furthermore, the one-way positioning rack allows the elastically set positioning ratchet to move in a single direction, without hindering the sliding adjustment between the two support frames. During reset, as the hydraulic cylinder contracts, it drives the adjustment plate to move along the hinge point, simultaneously causing the support frame to swing in the reset direction. The positioning ratchet swings up, disengaging from the one-way positioning rack, facilitating the sliding reset of the two support frames. The operation is simple, quick, and highly practical. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0019] Figure 2 This is a top view of the support frame in an embodiment of this application;

[0020] Figure 3 This is a partial inner view of the connection between the positioning ratchet and the support frame in an embodiment of this application;

[0021] Figure 4 This is a front view of a unidirectional positioning rack according to an embodiment of this application. Detailed Implementation

[0022] The present invention will now be described clearly and completely with reference to the accompanying drawings and embodiments:

[0023] like Figures 1 to 4As shown, the support system for displacement control of a semi-covered excavation pit according to this utility model includes two crossbeams 1 located at the ends. The crossbeams 1 are H-shaped steel beams, with a hanger 2 hinged in the groove at the top of the beams 1 and a support column 3 at the bottom of the crossbeams 1. Each crossbeam 1 is equipped with a support frame 4, which has a U-shaped structure and is slidably connected to another support frame 4. A hydraulic cylinder 5 is installed inside one of the support frames 4. The hydraulic cylinder 5 is fixed by multiple reinforcing beams 6 placed horizontally within the support frame 4 to ensure the structural strength of the support frame 4 and the stability of the hydraulic cylinder 5. A one-way positioning rack 7 is installed on the support frame 4 where the hydraulic cylinder 5 is located. The teeth on the one-way positioning rack 7 are arranged obliquely in the same direction, allowing the positioning ratchet 8 to move along the one-way positioning rack 7 when the two support frames 4 move away from each other. The telescopic end of the hydraulic cylinder 5 is connected to the other support frame 4, and a support frame 9 is movably installed on its upper end. The support frame 9 has an inverted U-shaped structure, and the bottom sides of the support frame 9 are movably connected to the support frame 4. In this embodiment, adjustment grooves 10 are provided on both sides of the top of the support frame 9. The bottom sides of the support frame 9 pass through the adjustment grooves 10 and are movably connected to the inner wall of the support frame 4. (See attached document for details.) Figure 3 As shown; in addition, the support frame 9 can also be movably connected to the outside of both sides of the support frame 4; an adjusting plate 11 is hinged to the end of the support frame 4 away from the support frame 9, the bottom end of the adjusting plate 11 is hinged to the telescopic end of the hydraulic cylinder 5, and a positioning ratchet 8 is elastically provided on the support frame 9; a connecting rod 12 is hinged on the support frame 9, and the connecting rod 12 is hinged to the adjusting plate 11. In the initial state, both the adjusting plate 11 and the support frame 9 are in an inclined state, and the positioning ratchet 8 is disengaged from the one-way positioning rack 7. During operation, as the extension end of the hydraulic cylinder 5 extends, it pushes the adjusting plate 11 to rotate along the hinge point. At this time, under the action of the connecting rod 12, it pushes the support frame 9 to move, causing the positioning ratchet 8 to fall and contact the one-way positioning rack 7, completing the meshing operation. Since the inclination direction of the teeth in the one-way positioning rack 7 is arranged along the moving direction of the positioning ratchet 8, the positioning ratchet 8 will not be obstructed when the two support frames 4 are far apart. On the contrary, after the support frame 4 is subjected to force, the one-way positioning rack 7 will limit the positioning ratchet 8, which can share the force on the hydraulic cylinder 5 after the support frame 4 is subjected to the deformation force of the foundation pit, ensuring the stability of the two support frames 4.

[0024] In this embodiment, as Figure 4 As shown, the included angle of the groove 13 formed between two adjacent teeth of the one-way positioning rack 7 is greater than 90 degrees, preferably less than 120 degrees. This ensures that the positioning rack 8 can be positioned in conjunction with the positioning ratchet 8, while also facilitating the smooth swinging of the positioning ratchet 8 out of the groove 13 of the one-way positioning rack 7 when the hydraulic cylinder retracts and drives the adjusting plate 11 to move. This also facilitates the reset and retraction of the two support frames 4.

[0025] Furthermore, a groove 14 is provided along the length of the outer wall of the support frame 4 where the hydraulic cylinder 5 is located, and a slider is provided on the inner wall of the support frame 4 to which the telescopic end of the hydraulic cylinder 5 is connected. The slider slides within the groove 14. A one-way positioning rack 7 is located on the outer side of the bottom of the groove 14, and a roller 15 is movably mounted on the slider, located within the groove 14 inside the one-way positioning rack 7. During operation, the roller 15 reduces friction caused by direct contact between the slider and the groove 14. Additionally, a positioning ratchet 8 is preferably located on the inner wall of the support frame 4 on the front and rear sides of the roller 15 to avoid adversely affecting the movement of the roller 15.

[0026] Furthermore, a support beam 16 is fixedly installed on the support frame 4 where the adjusting plate 11 is located, and a limiting frame 17 is fixedly installed on the support beam 16. A limiting plate 18 is installed at the telescopic end of the hydraulic cylinder 5, and the adjusting plate 11 is hinged to the limiting plate 18. In the initial state, the limiting plate 18 abuts against the limiting frame 17, and the adjusting plate 11 is in an inclined state. By setting the limiting plate 18 and the limiting frame 17, during the reset, the contact between the limiting plate 18 and the limiting frame 17 can be used to apply the pulling force to the limiting frame 17, avoiding continuous pulling on the adjusting plate 11 and causing deformation of the adjusting plate 11. In addition, a hinge groove 19 is provided on the support beam 16, and the adjusting plate 11 is hinged in the hinge groove 19. The width of the limiting plate 18 is greater than the width of the hinge groove 19. When the adjusting plate 11 is in the vertical state during operation, the limiting plate 18 abuts against the support beam 16 to prevent the state of the adjusting plate 11 from changing as the hydraulic cylinder 5 continues to extend, thus affecting the movement of the positioning ratchet 8 on the one-way positioning rack 7.

[0027] Furthermore, each end of the support frame 4 is provided with an L-shaped connecting plate 20, and a U-shaped support frame 21 is fixedly provided on the crossbeam 1. A connecting groove for hanging the connecting plate 20 is formed between the support frame 21 and the crossbeam 1, which facilitates the installation and disassembly of the support frame 4 and the crossbeam 1. In addition, a buffer pad 22 is provided on the outside of the connecting plate 20. Preferably, the sum of the widths between the buffer pad 22 and the connecting plate 20 is equal to the width of the connecting groove, so that the buffer pad is subjected to force during operation.

[0028] Furthermore, auxiliary diagonal braces 23 are hinged to the side walls of both crossbeams 1, and the auxiliary diagonal braces 23 are detachably connected to the support frame 4. In order not to affect the normal sliding adjustment between the two support frames 4, the bottom of the support frame 4 of the hydraulic cylinder 5 is connected to the auxiliary diagonal brace 23, and the side wall of the support frame 4 of the adjusting plate 11 is connected to the auxiliary diagonal brace 23, which ensures the stability of the two in shape during operation and does not affect the normal adjustment operation.

[0029] In use, this utility model first connects the connecting plate 20 on the support frame 4 to the connecting groove on the end crossbeam 1. Then, the entire system is installed at the designated location in the foundation pit. During operation, the hydraulic cylinder 5 is controlled to work. As the extension end of the hydraulic cylinder 5 extends, it pushes the adjusting plate 11 to move along the hinge point. As the hydraulic cylinder 5 contacts the support crossbeam 16, the adjusting plate 11 is in a vertical state. Under the action of the connecting rod 12, the support frame 9 is also adjusted to a vertical state. The positioning ratchet 8 and the one-way positioning tooth are elastically set on the support frame 9. When the hydraulic cylinder 5 extends, the positioning ratchet 8 moves along the one-way positioning rack 7 until the hydraulic cylinder 5 is in position. The positioning ratchet 8 then resides in the groove 13 on the one-way positioning rack 7, thus providing auxiliary positioning for the support frame 4. When disassembly is required, the hydraulic cylinder 5 retracts, the limit plate 18 pulls the adjusting plate 11 to reset, the support frame 9 resets, the positioning ratchet 8 disengages from the one-way positioning rack 7, and the limit plate 18 abuts against the limit frame 17. Dragging the limit frame 17 completes the reset operation of the support frame 4. The entire system is easy to operate, highly stable, and practical.

Claims

1. A semi-closed excavation displacement control support system comprising two end transoms, each of said transoms having a support frame disposed thereon, characterized in that: The support frame is U-shaped, and two support frames are slidingly connected; one inner side of the support frame is provided with a hydraulic cylinder, and a one-way positioning rack is arranged on the hydraulic cylinder; the telescopic end of the hydraulic cylinder is connected with the other support frame, a support frame is movably arranged on one end of the telescopic end of the hydraulic cylinder, and an adjusting plate is hingedly connected to the other end of the telescopic end of the hydraulic cylinder; the bottom end of the adjusting plate is hingedly connected to the telescopic end of the hydraulic cylinder, and a positioning ratchet is elastically arranged on the support frame; a connecting rod is hingedly connected to the support frame, the connecting rod is hingedly connected to the adjusting plate, and the adjusting plate and the support frame are both in an inclined state in an initial state, and the positioning ratchet is disengaged from the one-way positioning rack.

2. The semi-bracketed, excavated foundation pit displacement control support system according to claim 1, characterized in that: The outer side wall of the support frame where the hydraulic cylinder is arranged is provided with a sliding groove along the length direction of the support frame, and the inner side wall of the support frame connected with the telescopic end of the hydraulic cylinder is provided with a sliding block, and the sliding block is slidingly arranged in the sliding groove.

3. The semi-bracketed, walled, displacement-controlled support system of claim 2, wherein: The one-way positioning rack is arranged on the outer side of the bottom of the sliding groove, a roller is movably arranged on the sliding block, and the roller is arranged in the sliding groove on the inner side of the one-way positioning rack.

4. The semi-bracketed excavation displacement control support system of claim 1, wherein: A support beam is fixedly arranged on the support frame where the adjusting plate is arranged, a limiting frame is fixedly arranged on the support beam, a limiting plate is arranged on the telescopic end of the hydraulic cylinder, the adjusting plate is hingedly connected to the limiting plate, the limiting plate abuts against the limiting frame in an initial state, and the adjusting plate is in an inclined state at this time.

5. The semi-bracketed, walled, displacement-controlled support system of claim 4, wherein: A hinging groove is formed in the support beam, the adjusting plate is hingedly connected to the hinging groove, and the width of the limiting plate is greater than the width of the hinging groove; when the adjusting plate is in a vertical state in a working state, the limiting plate abuts against the support beam.

6. The semi-bracketed excavation displacement control support system of claim 1, wherein: End portions of the support frame are provided with L-shaped connecting plates, and a U-shaped receiving frame is fixedly arranged on the beam, and a connecting groove for hanging the connecting plate is formed between the receiving frame and the beam.

7. The semi-bracketed, walled, displacement-controlled support system of claim 6, wherein: A buffer rubber pad is arranged on the outer side of the connecting plate.

8. The semi-bracketed excavation displacement control support system of claim 1, wherein: A suspender is arranged on the beam, and a support column is arranged at the bottom of the beam.

9. The semi-bracketed, walled, displacement-controlled support system of claim 8, wherein: The beam is an H-shaped steel beam, and the suspender is hingedly connected to a groove in the upper portion of the beam.

10. The semi-bracketed excavation pit displacement control support system of claim 1, wherein: An auxiliary inclined support is hingedly connected to the side wall of the beam, and the auxiliary inclined support is detachably connected to the support frame.

Images