A U-shaped foundation pit supporting device

Abstract

The application discloses a U-shaped foundation pit supporting device and relates to the technical field of foundation pit supporting tools.The technical scheme of the U-shaped foundation pit supporting device comprises door-shaped frames used for supporting soil retaining plates on both sides of a foundation pit and a plurality of cross arms arranged between the two groups of door-shaped frames; and each door-shaped frame comprises vertical rods arranged on both sides and horizontal rods arranged between the vertical rods.The U-shaped foundation pit supporting device is formed by cooperation of the door-shaped frames and the cross arms and is erected in the foundation pit, so that the U-shaped foundation pit supporting device can stably support the soil retaining plates on both sides of the foundation pit, thereby providing a safe working environment for excavation construction of a rock layer at the bottom of the foundation pit.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support equipment technology, specifically to a Z-shaped foundation pit support device. Background Technology

[0002] In the process of excavating cable trench foundation pits, complex geological conditions are often encountered, such as the upper part being fill soil, silt, and quicksand layers, while the lower part is a rock layer. This makes it impossible to successfully install conventional support methods such as steel sheet piles, channel steel, and structural steel, thus failing to provide stable support for the retaining walls on both sides. This poses a great safety risk to the construction operations in the foundation pit. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a Z-shaped foundation pit support device.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A U-shaped foundation pit support device includes a portal frame for supporting retaining walls on both sides of the foundation pit and multiple sets of horizontal arms disposed between two sets of portal frames; wherein the portal frame includes uprights on both sides and horizontal bars disposed between the uprights.

[0005] Furthermore, the portal frame also includes reinforcing bars disposed between the uprights and below the horizontal bars.

[0006] Furthermore, the cross arm includes a fixed frame, support rods movably connected to both ends of the fixed frame, and an adjustment assembly on the fixed frame for adjusting the extension length of the support rods. The portal frame is provided with insertion holes for the support rods to be fitted and inserted.

[0007] Furthermore, the fixed frame has spline grooves on both sides, and the support rod is movably inserted into the spline groove. The adjustment component includes two sets of threaded sleeves inserted into the spline groove on the side away from the support rod, a handle set between the two sets of threaded sleeves, and threaded rods set at both ends of the handle and threadedly connected to the threaded sleeves. The threaded sleeves are provided with key plates adapted to the spline groove.

[0008] Furthermore, the bottom of the horizontal bar is also hinged with multiple sets of diagonal bracing arms, the reinforcing bar has a first groove for the diagonal bracing arms to engage, and the horizontal bar is provided with a sensing component for triggering the horizontal bar to rotate after being subjected to the pressure of the excavator, so that the horizontal bars on both sides of the portal frame can rotate and mate to form a "V" shaped support structure.

[0009] Furthermore, the diagonal brace is provided with a movable shaft, and the bottom of the horizontal rod is provided with an ear plate that is rotatably connected to the movable shaft, so that the diagonal brace is hinged to the horizontal rod. The sensing component includes gears provided at both ends of the movable shaft, a rack plate that is movably connected to the horizontal rod and meshes with the gears, and a pressure plate provided at the end of the rack plate away from the gears. Under normal conditions, the pressure plate is higher than the top plane of the horizontal rod.

[0010] Furthermore, a limiting horizontal plate is provided between the uprights and the horizontal bar and the reinforcing bar. The limiting horizontal plate has a second groove for the diagonal brace arm to be movably engaged. When the rack plate moves downward to drive the diagonal brace arm to rotate to form a "V" shape, the bottom end of the rack plate abuts against the upper surface of the limiting horizontal plate.

[0011] Furthermore, a fixing plate is provided on one of the rack plates of the triggering component, and a spring is provided between the fixing plate and the limiting cross plate.

[0012] Furthermore, a rubber gasket is provided at the end of the support rod that passes through the insertion hole.

[0013] Compared with the prior art, the beneficial effects of this solution are: the present invention forms a zigzag frame structure erected in the foundation pit by combining a portal frame and a crossarm, which can provide stable support for the retaining plates on both sides of the foundation pit, thereby providing a safe working environment for the excavation of the rock layer at the bottom of the foundation pit. Attached Figure Description

[0014] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the installation of the present invention within the foundation pit according to an embodiment of the invention; Figure 2 This is a front view schematic diagram of the foundation pit according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 4 This is a schematic diagram of the combination of the portal frame and the crossarm in an embodiment of the present invention; Figure 5 This is a schematic diagram showing the disassembly of the portal frame and the crossarm in an embodiment of the present invention; Figure 6 This is an exploded view of the adjustment component in an embodiment of the present invention; Figure 7 This is a partial structural schematic diagram of the portal frame in an embodiment of the present invention; Figure 8 This is a schematic diagram illustrating the cooperation relationship between the sensing component and the diagonal support arm in an embodiment of the present invention.

[0015] In the figure: 1, retaining plate; 11, transverse arm; 12, vertical rod; 13, horizontal rod; 2, reinforcing rod; 21, insertion hole; 22, first groove; 3, fixing frame; 31, support rod; 32, spline groove; 33, threaded sleeve; 34, hand lever; 35, threaded rod; 36, key plate; 4, inclined support arm; 41, movable shaft; 42, ear plate; 5, gear; 51, rack plate; 52, pressure receiving plate; 6, limiting transverse plate; 61, second groove; 7, fixing plate; 71, spring; 8, rubber gasket. DETAILED DESCRIPTION OF EMBODIMENTS

[0016] Hereinafter, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. The embodiments of the present application and the features in the embodiments can be combined with each other without conflict. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] As Figure 1-8 shown, a herringbone-shaped foundation pit support device comprises portal frames for supporting retaining plates 1 on both sides of a foundation pit and a plurality of groups of transverse arms 11 arranged between two groups of portal frames; wherein the portal frame comprises vertical rods 12 located on both sides and horizontal rods 13 arranged between the vertical rods 12. In the excavation construction of cable trench foundation pits, since the excavation section sometimes has part of soft soil layer and part of rock layer, steel sheet piles, channel steels, section steels and the like cannot be driven smoothly at this time, resulting in unstable support of the retaining plates 1. Therefore, the present solution designs that the portal frame cooperates with the transverse arms 11 to form a herringbone-shaped frame structure in side view, and the assembled frames are sequentially filled into the excavated foundation pit. At this time, the retaining plates 1 are arranged on both sides of the foundation pit, and supported by the integral frame structure, which ensures the stability of the support. Then an excavator can stride on both sides of the foundation pit and walk along the foundation pit, and excavate the rock layer in the space between the transverse arms 11. In this process, the transverse arm 11 at the position corresponding to the excavator can be disassembled to avoid the influence of shielding on the excavation work. Since a plurality of groups of transverse arms 11 are arranged on the device, the overall support stability will not be affected when a single row is disassembled separately.

[0018] In an embodiment, the portal frame further comprises a reinforcing rod 2 arranged between the vertical rods 12 and located below the horizontal rods 13, thereby making the whole portal frame more stable.

[0019] In one embodiment, the cross arm 11 includes a fixed frame 3, support rods 31 movably connected to both ends of the fixed frame 3, and an adjustment component set on the fixed frame 3 for adjusting the extension length of the support rods 31. The portal frame is provided with insertion holes 21 for the support rods 31 to be inserted. By setting the adjustment component, the frame can be adapted and adjusted according to the excavation width of the pit, so that it can be stably supported in the pit.

[0020] In one embodiment, spline grooves 32 are provided on both sides of the fixing frame 3, and the support rods 31 are movably inserted into the spline grooves 32. The adjustment assembly includes two sets of threaded sleeves 33 inserted into the spline grooves 32 on the side away from the support rods 31, a hand rod 34 disposed between the two sets of threaded sleeves 33, and threaded rods 35 disposed at both ends of the hand rod 34 and threadedly connected to the threaded sleeves 33. The threaded sleeves 33 are provided with key plates 36 adapted to the spline grooves 32. First, the portal frame is abutted against the retaining plate 1 and attached to the foundation pit wall. Then, the workers rotate the hand rod 34 by hand, and then use the threaded rods 35 to drive the threaded sleeves 33 to move in the spline grooves 32, thereby abutting the support rods 31 on both sides to extend outward until the support rods 31 are inserted into the insertion holes 21 and the two ends are pressed together, thereby forming a stable support system.

[0021] In one embodiment, the bottom of the horizontal bar 13 is also hinged with multiple sets of diagonal bracing arms 4, and the reinforcing bar 2 has a first groove 22 for the diagonal bracing arms 4 to engage. The horizontal bar 13 is provided with a sensing component for triggering the rotation of the horizontal bar 13 after being subjected to the pressure of the excavator. Since the excavator is mostly responsible for the excavation work, and the excavator needs to straddle the two sides of the pit to facilitate excavation, the load on the soil increases as the excavator moves. This load is then transmitted to both sides through the soil, increasing the pressure on the retaining plate 1 at the corresponding location. The diagonal bracing arms 4, in conjunction with the sensing component, are used to address this situation. When the excavator moves, it presses against the corresponding sensing component, thereby driving the portal frames on both sides. The diagonal brace 4 on the frame rotates and abuts to form a "V"-shaped support, thereby enhancing the frame support force at this point to offset the load brought by the excavator. When the excavator continues to move and disengages from the corresponding sensing component, the diagonal brace 4 rotates and retracts under its own weight. Since there is a certain distance between the excavator wheels and the front digging component, the diagonal brace 4 corresponding to the digging component will not open when the excavator moves, but only the diagonal brace 4 corresponding to the wheel position will open for support. This ensures that the load of the main body of the excavator is offset without affecting the digging of the digging component, and is also more efficient.

[0022] In one embodiment, a movable shaft 41 is provided on the diagonal brace 4, and an ear plate 42 rotatably connected to the movable shaft 41 is provided at the bottom of the horizontal rod 13, so that the diagonal brace 4 is hinged to the horizontal rod 13. The sensing component includes gears 5 provided at both ends of the movable shaft 41, a rack plate 51 movably passing through the horizontal rod 13 and meshing with the gears 5, and a pressure plate 52 provided at the end of the rack plate 51 away from the gears 5. Under normal conditions, the pressure plate 52 is higher than the top plane of the horizontal rod 13, but the distance at the top is much smaller than the diameter of the excavator's wheel. Therefore, when the excavator moves, it can easily press on the pressure plate 52 and drive it to move downward. Then, the rack plate 51 drives the gears 5 to rotate, which in turn drives the diagonal brace 4 to rotate, so that the opposing diagonal braces 4 form a bracing relationship.

[0023] In one embodiment, a limiting horizontal plate 6 is also provided between the uprights 12 and between the horizontal bar 13 and the reinforcing bar 2. The limiting horizontal plate 6 has a second groove 61 for the diagonal brace 4 to be movably engaged. When the rack plate 51 moves downward to drive the diagonal brace 4 to rotate to form a "V" shape, the bottom end of the rack plate 51 abuts against the upper surface of the limiting horizontal plate 6, thereby ensuring that the rack plate 51 has a vertical support structure, so that the overall load of the excavator will be distributed to the frame and the surrounding soil, and the transmission structure of the gear 5 and the rack plate 51 will not bear a large torque.

[0024] In one embodiment, a fixing plate 7 is provided on one of the rack plates 51 of the triggering component, and a spring 71 is provided between the fixing plate 7 and the limiting cross plate 6. When not under the load of the excavator, the diagonal support arm 4 can be retracted by its own weight. The spring 71 is provided to avoid possible jamming, thereby avoiding the need for manual repositioning and improving the continuity of excavation operations.

[0025] In one embodiment, a rubber gasket 8 is provided at the end of the support rod 31 that passes through the insertion hole 21. The rubber gasket 8 enables the support rod 31 and the portal frame to abut and stabilize while reducing rigid friction and improving structural durability.

[0026] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A Z-shaped foundation pit support device, characterized in that: It includes a portal frame for supporting the retaining walls (1) on both sides of the foundation pit and multiple sets of cross arms (11) set between the two sets of portal frames. The portal frame includes uprights (12) on both sides and horizontal bars (13) between the uprights (12).

2. The Z-shaped foundation pit support device according to claim 1, characterized in that: The portal frame also includes a reinforcing bar (2) disposed between the uprights (12) and below the horizontal bar (13).

3. The Z-shaped foundation pit support device according to claim 2, characterized in that: The cross arm (11) includes a fixed frame (3), a support rod (31) movably connected to both ends of the fixed frame (3), and an adjustment component set on the fixed frame (3) for adjusting the extension length of the support rod (31). The portal frame is provided with a socket (21) for the support rod (31) to be inserted.

4. The Z-shaped foundation pit support device according to claim 3, characterized in that: The fixed frame (3) has spline grooves (32) on both sides, and the support rod (31) is movably inserted into the spline groove (32). The adjustment component includes two sets of threaded sleeves (33) inserted into the spline groove (32) on the side away from the support rod (31), a handle (34) set between the two sets of threaded sleeves (33), and threaded rods (35) set at both ends of the handle (34) and threadedly connected to the threaded sleeves (33). The threaded sleeves (33) are provided with key plates (36) adapted to the spline groove (32).

5. The Z-shaped foundation pit support device according to any one of claims 2-4, characterized in that: The bottom of the horizontal bar (13) is also hinged with multiple sets of diagonal bracing arms (4). The reinforcing rod (2) has a first groove (22) for the diagonal bracing arms (4) to engage. The horizontal bar (13) is provided with a sensing component for triggering the horizontal bar (13) to rotate after being subjected to the pressure of the excavator, so that the horizontal bars (13) on both sides of the portal frame can rotate and mate to form a "V" shaped support structure.

6. The Z-shaped foundation pit support device according to claim 5, characterized in that: The inclined support arm (4) is provided with a movable shaft (41), and the bottom of the horizontal rod (13) is provided with an ear plate (42) that is rotatably connected to the movable shaft (41), so that the inclined support arm (4) is hinged to the horizontal rod (13). The sensing component includes gears (5) provided at both ends of the movable shaft (41), a rack plate (51) that is movably connected to the horizontal rod (13) and meshes with the gears (5), and a pressure plate (52) provided at the end of the rack plate (51) away from the gears (5). Under normal conditions, the pressure plate (52) is higher than the top plane of the horizontal rod (13).

7. The Z-shaped foundation pit support device according to claim 6, characterized in that: A limiting horizontal plate (6) is also provided between the uprights (12) and the horizontal bar (13) and the reinforcing bar (2). The limiting horizontal plate (6) has a second groove (61) for the diagonal brace (4) to be engaged. When the rack plate (51) moves downward to drive the diagonal brace (4) to rotate to form a "V" shape, the bottom end of the rack plate (51) abuts against the upper surface of the limiting horizontal plate (6).

8. The Z-shaped foundation pit support device according to claim 7, characterized in that: A fixing plate (7) is provided on one of the rack plates (51) of the triggering component, and a spring (71) is provided between the fixing plate (7) and the limiting cross plate (6).

9. The Z-shaped foundation pit support device according to claim 4, characterized in that: A rubber gasket (8) is provided at the end of the support rod (31) that passes through the insertion hole (21).

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