Large deep foundation pit support system with safety system

Abstract

The present invention relates to the technical field of foundation pit support, and discloses a large-scale deep foundation pit internal support system with a safety system, including a telescopic rod, a support rod, a connecting plate and a retaining plate, one end of the telescopic rod is rotatably connected to a connecting block through a pin, the connecting block is movably installed with an elastic component, the elastic component is connected to one side of the support rod, and the elastic component reserves an elastic expansion space between the support rod and the telescopic rod for detecting the displacement of the support rod and the retaining plate when supporting the foundation pit, the retaining plate is provided with a clamping groove on both sides of the retaining plate, and an assembly structure is provided on one side of the support rod. The large-scale deep foundation pit internal support system with a safety system can effectively apply prestress to the side wall of the foundation pit, so that the pit wall itself has a certain supporting force, and can realize the monitoring of the deformation of the side wall of the foundation pit, and can also timely eliminate the underground seepage of the foundation pit soil layer, thereby improving the safety factor during foundation pit support.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit support, in particular to a large deep foundation pit internal support system with a safety system. Background Art

[0002] The foundation pit is a soil pit excavated at the foundation design position according to the base elevation and foundation plane size. During the foundation pit excavation process, if the foundation pit wall soil is unstable and affected by groundwater, or is restricted by the construction site or adjacent buildings and slope excavation cannot be adopted, a support structure is required for the foundation pit. Foundation pit support is a support, reinforcement and protection measure for the side walls and surrounding environment of the foundation pit to ensure the safety of underground structure construction and the surrounding environment of the foundation pit. The existing foundation pit support structure is to set a plurality of support plates around the foundation pit, and the support plates are set toward the inner wall of the foundation pit. When the inner wall of the foundation pit here tilts toward the foundation pit, the support plates can play a certain supporting effect. At the same time, in order to cope with the problem that the contact area between the support plate and the ground becomes smaller and smaller after the foundation pit is excavated, resulting in a reduction in the supporting effect of the support plate, a support frame can be set on the side of the support plate facing away from the inner wall of the foundation pit. The support frame includes a pile body or a cast-in-place concrete beam frame set on the bottom wall of the foundation pit, and a rod body connected to the pile body and the support plate at both ends. As the foundation pit is excavated, the piles are pressed downward and the rods are moved downward to provide lasting support for the support plates, thereby ensuring the supporting effect of the support plates.

[0003] At present, traditional foundation pit slope protection is usually constructed in advance and then the earth is excavated. This leads to a relatively fixed prestress between the support plate and the pit wall, and the support plate is rigidly connected to the supporting rod. The force generated by the deformation of the support plate will directly act on the supporting rod. If the supporting rod breaks, the support plate will collapse in a short time. In addition, the support plate directly isolates the groundwater at the pit wall, which will cause the soil layer at the pit wall to loosen, increasing the risk of pit wall collapse. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a support system for large deep foundation pits with a safety system, which solves the problem that the prestress between the support plate and the pit wall is relatively fixed, and the support plate is rigidly connected to the support rod. The force generated by the deformation of the support plate will directly act on the support rod. Once the support rod breaks, the support plate will collapse in a short time. In addition, the support plate directly isolates the groundwater at the pit wall, which will cause the soil layer at the pit wall to loosen, increasing the risk of pit wall collapse.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a large deep foundation pit support system with a safety system, comprising a telescopic rod, a support rod, a connecting plate and a retaining plate, one end of the telescopic rod is rotatably connected to a connecting block through a pin, the connecting block is movably mounted with an elastic component, the elastic component is connected to one side of the support rod, and the elastic component reserves an elastic expansion space between the support rod and the telescopic rod for detecting the displacement of the support rod and the retaining plate when supporting the foundation pit;

[0008] The two opposite sides of the retaining plate are provided with a clamping groove, and one side of the support rod is provided with an assembly structure, and the assembly structure connects the two connected retaining plates through a tenon-and-mortise rivet structure with an adjustable angle;

[0009] The connecting plate is provided with a plurality of connecting plates for connecting the upper and lower retaining plates;

[0010] The retaining plate is a double-layer structure and is provided with a plurality of riveting holes, each of which is provided with an anchor rod. A drainage channel is provided in the retaining plate, and drainage pipes are fixedly connected to opposite sides of the retaining plate, and the drainage pipes are connected to the drainage channel.

[0011] Preferably, the elastic component includes a rectangular block, one side of the rectangular block is provided with two grooves, one end of the connecting block is provided with two connecting parts, the two connecting parts are rotatably connected in the grooves by pins, one side of the rectangular block is fixedly connected to two fixing plates, two positioning slots are provided on opposite sides of the two fixing plates, and fixing seats are provided on opposite sides of the rectangular block, the two fixing seats are fixedly connected to the support rod and provided with connecting holes, a clamping part is provided at the edge of the fixing seat, the positioning slot is clamped with the clamping part, and one side of the fixing plate is fixedly connected to two leaf spring groups.

[0012] Preferably, a bracket is fixedly connected to one side of the fixing seat, a sensor assembly is fixedly connected to the bracket, and a limiting plate is fixedly connected to the upper end of the rectangular block, and the limiting plate is located at one side of the sensor assembly.

[0013] Preferably, the retaining plate is composed of an inner plate and an outer plate, the side wall of the inner plate is provided with a plurality of transverse protrusions, the side wall of the outer plate is provided with a plurality of vertical protrusions, the inner plate and the outer plate are attached and fixedly connected by bolts, the transverse protrusions and the vertical protrusions form a drainage channel of a tic-tac-toe structure, and the rivet holes are opened at the junction of the transverse protrusions and the vertical protrusions.

[0014] Preferably, a right-angle plate is provided on one side of the outer plate, one side of the right-angle plate is fixedly connected to one end of the inner plate, the other side of the right-angle plate and one side of the outer plate together form a snap-in groove, the snap-in groove is connected to the assembly structure, and one side of the right-angle plate is provided with multiple notches.

[0015] Preferably, a partition is fixedly connected to one side of the outer plate, one end of the partition is in contact with one side of the inner plate, a drain pipe is fixedly connected to one side of the right-angle plate, the mouth of the drain pipe is located above the partition, a plurality of seepage holes are opened on the side wall of the outer plate, and a plurality of rectangular openings are opened on the side wall of the outer plate below the partition.

[0016] Preferably, the vertical protrusion and the side wall of the inner plate together form a plurality of plug-in holes, and the plurality of plug-in holes are all trapezoidal in structure. Inclined portions are provided at both ends of the connecting plate, a positioning protrusion is provided at the middle portion of the connecting plate, and a notch is provided at the upper end of the outer plate, and the notch cooperates with the positioning protrusion.

[0017] Preferably, the assembly structure includes two clamping blocks, one end of the support rod is provided with two bending parts, the two bending parts are fixedly connected with a clamping block, the side wall of the clamping block is sleeved with a C-shaped clamping strip, one side of the C-shaped clamping strip is fixedly connected with a plug-in board, the side wall of the plug-in board is provided with a folded edge, the plug-in board is movably plugged into the clamping groove, a sleeve is provided on one side of the support rod, a positioning rod is sleeved in the sleeve, and one side of the sleeve is threadedly connected with a bolt through a threaded hole.

[0018] Preferably, the anchor rod is a tubular structure, the side wall of the anchor rod is connected with a fixing nut via an external thread, a gasket is provided on one side of the fixing nut, a plurality of grouting holes are opened on the side wall of the anchor rod, a plurality of spiral openings are opened at one end of the anchor rod and a cylinder is sleeved thereon, and one end of the cylinder is a conical structure, a limiting rod is sleeved in the grouting hole, and one end of the limiting rod is fixedly connected to one end of the cylinder.

[0019] Preferably, a pull rod is provided on one side of the retaining plate, and a plurality of ground nail through holes are provided on the side wall of the pull rod, and ground nails are sleeved in the ground nail through holes, and two positioning blocks are provided at one end of the ground nail, and one end of the telescopic rod is rotatably connected to a fixed block through a rotating shaft, and the fixed block and the side wall of the pull rod are both provided with positioning grooves matching with the positioning blocks, and a connecting plate is provided at one end of the pull rod, and a connecting seat is provided on one side of the connecting plate, and the connecting seat is fixed to one side of the support rod, and the connecting seat and the connecting plate are connected through the ground nails.

[0020] (III) Beneficial effects

[0021] Compared with the prior art, the present invention provides a large deep foundation pit support system with a safety system, which has the following beneficial effects:

[0022] 1. When the present invention is used, a shallow pit close to the height of the retaining plate is dug in advance on the ground according to the size of the foundation pit, and then the support rods are inserted into the ground at a certain interval, and then the assembly structure is installed on the support rods, and then the retaining plate is inserted into the assembly structure and inserted into the bottom of the pit. At this time, a pre-support system that fits the periphery of the shallow pit can be formed, and the support rods and the retaining plate are supported by pull rods, telescopic rods and ground nails to form a triangular structure. At this time, excavation can continue downward, and during excavation, the soil at the bottom of the telescopic rods and the pull rods is reserved to form a supporting boss. After the soil at the bottom of the pit is dug out, the telescopic rods at the corresponding position can be removed. and pull rods. After the soil at the bottom of the retaining board is dug out, the retaining board can be pushed downward from the top to continue to be inserted into the ground. The telescopic rods and pull rods are randomly installed for timely support. Such reciprocating operation can realize that multiple retaining boards and support rods can be moved downward independently, and the telescopic rods and pull rods are used for rapid support, so as not to affect the supporting effect of other retaining boards. After support, an elastic expansion space is reserved between the elastic component arranged at one end of the telescopic rod and the telescopic rod, so that when the retaining board is squeezed, a certain displacement can be generated between the telescopic rod and the retaining board. At this time, the sensor component can be used to monitor the displacement of the retaining board when supporting the foundation pit.

[0023] 2. There is a certain expansion space between the retaining plate and the telescopic rod, so that the force on the retaining plate does not directly act on the telescopic rod, which increases the bearing capacity of the telescopic rod and avoids the loss of supporting force due to bending deformation caused by direct acceptance. In addition, during expansion and contraction, the sensor component can be used to detect the stress point in time, so that the staff at the edge of the foundation pit can avoid danger in time.

[0024] 3. A gap can be reserved between the retaining plate and the foundation pit. When the side wall of the foundation pit is hardened by pouring concrete, the retaining plate acts as a template. In addition, the riveting holes set on the retaining plate can be directly drilled on the side wall of the foundation pit and anchor rods can be inserted for grouting. This can improve the hardening effect of the side wall of the foundation pit and increase the safety factor when supporting the foundation pit. When backfill soil is used to treat the gap, the inner plate of the retaining plate faces the side wall of the foundation pit. After filling the backfill soil and compacting it, the lateral protrusions on the inner plate can be used to increase the friction between the side wall of the foundation pit. When subjected to force, the retaining plate will not slide upward under the action of the telescopic rod. When water seeps out from the deep soil of the foundation pit, the drainage channel set on the retaining plate can timely concentrate the water in the retaining plate and discharge it in a centralized manner, avoiding the turbulence of water around the foundation pit affecting the construction and causing the soil around the foundation pit to loosen, thereby improving the safety factor during support.

[0025] 4. The elastic component provided in the present invention, when in use, inserts the rectangular block between the two fixed seats, at this time the leaf spring group contacts the retaining plate first, and the rectangular block is pushed to move by adjusting the length of the telescopic rod. When the rectangular block moves, it drives the fixed plate to compress the leaf spring group, and the effect of elastic support can be realized. When the retaining plate is subjected to force from the side of the foundation pit, the retaining plate first contacts and decompresses the leaf spring group to continue to deform, and at this time the fixed seat slides relatively and contacts the limit plate, and at this time the support rod plays the role of rigid support, and continues to support the retaining plate to support the foundation pit.

[0026] 5. The present invention is provided with an assembly structure. When in use, the plug-in plate can be first inserted into the C-shaped card strip by using the card block, and then when inserting the earth retaining plate, the plug-in plate is inserted into the card slot, and the plug-in assembly can be completed at this time. Moreover, when assembling the upper and lower earth retaining plates, the connecting plate can be first inserted into the upper end of the lower earth retaining plate, and then the lower end of the upper earth retaining plate is inserted into the upper end of the connecting plate. At this time, the assembly of the upper and lower earth retaining plates can be completed, and after assembly, the extended rod can be used for auxiliary support. When in use, the pull rod is used to assist in fixing the telescopic rod, and the ground nail can be used to fix one end of the telescopic rod to the ground, and the positioning block and the positioning slot on the ground nail are used for limiting.

[0027] 6. When inserting the anchor rod, the cylinder first contacts the bottom of the anchor hole. When striking the anchor rod, the cylinder uses the inclined surface to expand the spiral opening to form multiple anchor claws. This can increase the friction between the anchor rod and the side wall of the foundation pit. Grouting can be performed directly from one end of the anchor rod, and after the mortar solidifies, the grouting hole is also filled with mortar, so that there is sufficient connection area after the mortar inside and outside the anchor rod hardens. In addition, the retaining plate can be fixed with fixing nuts and gaskets to enhance the connection strength and safety factor between the retaining plate and the side wall of the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The structural diagram of the large deep foundation pit support system with a safety system proposed by the present invention Figure 1 ;

[0029] Figure 2 The structural diagram of the large deep foundation pit support system with a safety system proposed by the present invention Figure 2 ;

[0030] Figure 3 This is a schematic diagram of the structure of the elastic components and support rods in the support system in a large deep foundation pit with a safety system proposed by the present invention;

[0031] Figure 4 The large deep foundation pit support system with a safety system proposed by the present invention Figure 3 A magnified view of the structure at center A;

[0032] Figure 5 The structural diagram of the assembly structure in the support system of a large deep foundation pit with a safety system proposed by the present invention Figure 1 ;

[0033] Figure 6 The structural diagram of the assembly structure in the support system of a large deep foundation pit with a safety system proposed by the present invention Figure 2 ;

[0034] Figure 7 This is a schematic diagram of the structure of the retaining plate in the support system of a large deep foundation pit with a safety system proposed by the present invention;

[0035] Figure 8 This is a schematic diagram of the structure of the outer plate in the large deep foundation pit support system with a safety system proposed by the present invention;

[0036] Fig. 9 This is a schematic diagram of the structure of the inner plate in the large deep foundation pit support system with a safety system proposed by the present invention;

[0037] Fig.10 This is a schematic diagram of the structure of the connecting plate in the support system of a large deep foundation pit with a safety system proposed by the present invention;

[0038] Fig.11 This is a schematic diagram of the structure of the anchor rod in the support system of a large deep foundation pit with a safety system proposed by the present invention;

[0039] Fig.12 The structural diagram of the retaining plate support in the large deep foundation pit support system with a safety system proposed by the present invention Figure 1 ;

[0040] Fig.13 The structural diagram of the retaining plate support in the large deep foundation pit support system with a safety system proposed by the present invention Figure 2 ;

[0041] Fig.14 The structural diagram of the retaining plate support in the large deep foundation pit support system with a safety system proposed by the present invention Figure 3 .

[0042] In the figure: 1, inner plate; 2, telescopic rod; 3, pull rod; 4, plug-in board; 5, support rod; 6, positioning rod; 7, fixing nut; 8, rivet hole; 9, connecting plate; 10, ground nail; 11, outer plate; 12, rectangular opening; 13, fixing plate; 14, leaf spring assembly; 15, connecting seat; 16, limit plate; 17, rectangular block; 18, connecting block; 19, positioning slot; 20, sensor assembly; 2 1. Fixing seat; 22. Connecting hole; 23. Clamping part; 24. Positioning block; 25. Connecting piece; 26. Ground nail hole; 27. Positioning groove; 28. Fixing block; 29. ​​Sleeve; 30. Clamping block; 31. Folding edge; 32. C-shaped clamping strip; 33. Seepage hole; 34. Partition plate; 35. Right-angle plate; 36. Positioning protrusion; 37. Anchor rod; 38. Cylinder; 39. Spiral opening; 40. Grouting hole. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Example 1: Refer to the attached Figure 1-12 A large deep foundation pit support system with a safety system includes a telescopic rod 2, a support rod 5, a connecting plate 9 and a retaining plate. The retaining plate is composed of an inner plate 1 and an outer plate 11. The side wall of the inner plate 1 is provided with a plurality of transverse protrusions, and the side wall of the outer plate 11 is provided with a plurality of vertical protrusions. The inner plate 1 and the outer plate 11 are attached and fixedly connected by bolts. The transverse protrusions and the vertical protrusions form a drainage channel of a tic-tac-toe structure. The rivet hole 8 is opened at the junction of the transverse protrusion and the vertical protrusion. A right-angle plate 35 is provided on one side of the outer plate 11. One side of the right-angle plate 35 is fixedly connected to one end of the inner plate 1, and the other side of the right-angle plate 35 and one side of the outer plate 11 together form a clamping groove, which is connected to the assembly structure. A plurality of notches are provided on one side of the outer plate 11, a partition 34 is fixedly connected to one side of the outer plate 11, one end of the partition 34 contacts one side of the inner plate 1, a drain pipe is fixedly connected to one side of the right-angle plate 35, and the pipe mouth of the drain pipe is located above the partition 34. A plurality of water seepage holes 33 are provided on the side wall of the outer plate 11, and a plurality of rectangular openings 12 are provided on the side wall of the outer plate 11 below the partition 34. One end of the telescopic rod 2 is rotatably connected to a connecting block 18 through a pin, and an elastic component is movably installed on the connecting block 18. The elastic component is connected to one side of the support rod 5, and the elastic component reserves an elastic telescopic space between the support rod 5 and the telescopic rod 2 for detecting the displacement of the support rod 5 and the retaining plate when supporting the foundation pit;

[0045] The retaining plates are provided with snap-in grooves on both sides opposite to each other, and an assembly structure is provided on one side of the support rod 5. The assembly structure connects the two connected retaining plates through an angle-adjustable mortise and tenon structure. The connecting plate 9 is provided with multiple holes for connecting the upper and lower retaining plates. The retaining plate is a double-layer structure and is provided with multiple rivet holes 8. Anchor rods 37 are provided in the multiple rivet holes 8. A drainage channel is provided in the retaining plate. Drainage pipes are fixedly connected to the opposite sides of the retaining plate, and the drainage pipes are connected to the drainage channel.

[0046] When the present invention is used, a shallow pit close to the height of the retaining plate is dug in advance on the ground according to the size of the foundation pit, and then the support rod 5 is inserted into the ground at a certain interval, and then the assembly structure is installed on the support rod 5, and then the retaining plate is inserted into the assembly structure and inserted into the bottom of the pit. At this time, a pre-support system that fits the periphery of the shallow pit can be formed, and the support rod 5 and the retaining plate are supported by the pull rod 3, the telescopic rod 2 and the ground nail 10 to form a triangular structure. At this time, excavation can continue downward, and during excavation, the soil at the bottom of the telescopic rod 2 and the pull rod 3 is reserved to form a supporting boss. After the soil at the bottom of the pit is dug out, the telescopic rod 2 at the corresponding position can be removed. And pull rod 3, after the soil at the bottom of the retaining plate is dug out, the retaining plate can be pushed downward from the top to continue to be inserted into the ground, and the telescopic rod and pull rod are randomly installed for timely support. Such reciprocating operation can realize that multiple retaining plates and support rods 5 can all be moved downward independently, and cooperate with the telescopic rod 2 and the pull rod 3 for rapid support, so as not to affect the supporting effect of other retaining plates. After support, an elastic expansion space is reserved between the elastic component arranged at one end of the telescopic rod 2 and the telescopic rod 2, so that when the retaining plate is squeezed, a certain displacement can be generated between the telescopic rod 2, and at this time, the sensor component 20 can be used to monitor the displacement of the retaining plate when supporting the foundation pit.

[0047] There is a certain telescopic space between the retaining plate and the telescopic rod 2, so that the force on the retaining plate does not directly act on the telescopic rod 2, thereby increasing the bearing capacity of the telescopic rod 2 and avoiding bending deformation and loss of supporting force due to direct acceptance. In addition, during extension and retraction, the sensor assembly 20 can promptly detect the stress point, so that the staff at the edge of the foundation pit can avoid danger in time.

[0048] When supporting, a gap can be reserved between the retaining plate and the foundation pit. When pouring concrete to harden the side wall of the foundation pit, Figure 1 The retaining plate is assembled with the structure, and the retaining plate plays the role of a template. In addition, the riveting holes 8 provided on the retaining plate can be directly drilled on the side wall of the foundation pit to insert the anchor rod 37 for grouting, so as to improve the hardening effect of the side wall of the foundation pit and increase the safety factor when supporting the foundation pit;

[0049] When backfilling the gap, follow the Figure 2The retaining plate is assembled with a structure, at which time the inner plate 1 of the retaining plate faces the side wall of the foundation pit. After filling the backfill soil and vibrating it, the lateral protrusions on the inner plate 1 can be used to increase the friction between the inner plate 1 and the side wall of the foundation pit. When subjected to force, the retaining plate will not slide upward under the action of the telescopic rod 2. When water seeps out of the deep soil of the foundation pit, the drainage channel arranged on the retaining plate can timely concentrate the water in the retaining plate and discharge it in a centralized manner, thereby avoiding the turbulence of water around the foundation pit affecting the construction and causing the soil around the foundation pit to loosen, thereby improving the safety factor during support.

[0050] Embodiment 2: Based on embodiment 1, the difference is that;

[0051] Refer to the attached Figure 3-4 The elastic component includes a rectangular block 17, one side of the rectangular block 17 is provided with two grooves, one end of the connecting block 18 is provided with two connecting parts, the two connecting parts are rotatably connected in the grooves through pins, one side of the rectangular block 17 is fixedly connected to two fixing plates 13, two positioning slots 19 are provided on the opposite sides of the two fixing plates 13, and fixing seats 21 are provided on the opposite sides of the rectangular block 17. The two fixing seats 21 are fixedly connected to the support rod 5 and have connecting holes 22. A clamping part 23 is provided at the edge of the fixing seat 21, and the positioning slot 19 is clamped with the clamping part 23. Two leaf spring groups 14 are fixedly connected to one side of the fixing plate 13, and a bracket is fixedly connected to one side of the fixing seat 21. A sensor assembly 20 is fixedly connected to the bracket, and a limit plate 16 is fixedly connected to the upper end of the rectangular block 17, and the limit plate 16 is located on one side of the sensor assembly 20.

[0052] The elastic component provided in the present invention, when in use, inserts the rectangular block 17 between the two fixed seats 21, at this time the leaf spring group 14 contacts the retaining plate first, and pushes the rectangular block 17 to move by adjusting the length of the telescopic rod 2, and when the rectangular block 17 moves, it drives the fixed plate 13 to compress the leaf spring group 14, and at this time the effect of elastic support can be achieved, when the retaining plate is subjected to force from the side of the foundation pit, the retaining plate first contacts and decompresses the leaf spring group 14 to continue to deform, and at this time the fixed seat 21 slides relatively and contacts the limit plate 16, and at this time the support rod 5 plays the role of rigid support, and continues to support the retaining plate to support the foundation pit.

[0053] Embodiment 3: Based on embodiment 1, the difference is that;

[0054] Refer to the attached Figure 5-14The assembly structure includes two blocks 30, one end of the support rod 5 is provided with two bent parts, and the two bent parts are fixedly connected with the block 30, the side wall of the block 30 is sleeved with a C-shaped card strip 32, one side of the C-shaped card strip 32 is fixedly connected with the plug-in board 4, the side wall of the plug-in board 4 is provided with a folding edge 31, the plug-in board 4 is movably plugged into the card slot, a sleeve 29 is provided on one side of the support rod 5, a positioning rod 6 is sleeved in the sleeve 29, one side of the sleeve 29 is threadedly connected with a bolt through a threaded hole, the vertical protrusion and the side wall of the inner plate 1 together form a plurality of plug-in holes, and the plurality of plug-in holes are all trapezoidal structures, both ends of the connecting plate 9 are provided with inclined parts, the middle part of the connecting plate 9 is provided with a positioning protrusion 36, and the upper end of the outer plate 11 is provided with a notch, and the notch matches the positioning protrusion 36;

[0055] The anchor rod 37 is a tubular structure. The side wall of the anchor rod 37 is connected to a fixing nut 7 through an external thread. A gasket is provided on one side of the fixing nut 7. A plurality of grouting holes 40 are provided on the side wall of the anchor rod 37. A plurality of spiral openings 39 are provided at one end of the anchor rod 37 and a cylinder 38 is sleeved thereon. One end of the cylinder 38 is a conical structure. A limit rod is sleeved in the grouting hole 40. One end of the limit rod is fixedly connected to one end of the cylinder 38. A pull rod 3 is provided on one side of the retaining plate. A plurality of ground nails are provided on the side wall of the pull rod 3. A through hole 26 is provided, and a ground nail 10 is sleeved in the through hole 26 of the ground nail. Two positioning blocks 24 are provided at one end of the ground nail 10. A fixed block 28 is rotatably connected to one end of the telescopic rod 2 through a rotating shaft. The fixed block 28 and the side walls of the pull rod 3 are both provided with positioning grooves 27 that match the positioning blocks 24. A connecting piece 25 is provided at one end of the pull rod 3. A connecting seat 15 is provided on one side of the connecting piece 25. The connecting seat 15 is fixed on one side of the support rod 5, and the connecting seat 15 and the connecting piece 25 are connected through the ground nail 10.

[0056] The present invention is provided with an assembly structure. When in use, the plug-in plate 4 can be first inserted into the C-shaped clamping strip 32 by using the clamping block 30, and then when inserting the earth retaining plate, the plug-in plate 4 is inserted into the clamping groove. At this time, the plug-in assembly can be completed. Moreover, when assembling the upper and lower earth retaining plates, the connecting plate 9 can be first inserted into the upper end of the lower earth retaining plate, and then the lower end of the upper earth retaining plate is inserted into the upper end of the connecting plate 9. At this time, the assembly of the upper and lower earth retaining plates can be completed, and after assembly, the extended rod can be used for auxiliary support.

[0057] When in use, the pull rod 3 is used to assist in fixing the telescopic rod 2. The ground nail 10 can be used to fix one end of the telescopic rod 2 to the ground, and the positioning block 24 and the positioning groove 27 on the ground nail 10 are used for limiting.

[0058] In addition, when the anchor rod 37 is inserted, the cylinder 38 first contacts the bottom of the anchor hole. When the anchor rod 37 is struck, the cylinder 38 expands toward the spiral opening 39 using its inclined surface to form a plurality of anchor claws. This can increase the friction between the anchor rod 37 and the side wall of the foundation pit. Grouting and fixing can be performed directly from one end of the anchor rod 37. After the mortar solidifies, the grouting hole 40 is also filled with mortar, so that the mortar inside and outside the anchor rod 37 has sufficient connection area after hardening. In addition, the retaining plate can be fixed with fixing nuts 7 and gaskets to enhance the connection strength and safety factor between the retaining plate and the side wall of the foundation pit.

[0059] It should be noted that the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large deep foundation pit support system with a safety system, comprising a telescopic rod (2), a support rod (5), a connecting plate (9) and a retaining plate, characterized in that: One end of the telescopic rod (2) is rotatably connected to a connecting block (18) via a pin, and an elastic component is movably mounted on the connecting block (18), the elastic component being connected to one side of the support rod (5), and the elastic component reserving an elastic telescopic space between the support rod (5) and the telescopic rod (2) for detecting the displacement of the support rod (5) and the retaining plate when supporting the foundation pit; The elastic component comprises a rectangular block (17), one side of the rectangular block (17) is provided with two grooves, one end of the connecting block (18) is provided with two connecting parts, the two connecting parts are rotatably connected in the grooves via pins, one side of the rectangular block (17) is fixedly connected to two fixing plates (13), the two fixing plates (13) are provided with two positioning slots (19) on opposite sides, and the two opposite sides of the rectangular block (17) are provided with fixing seats (21), and the two fixing seats (21) are fixedly connected to the supporting A connecting hole (22) is provided on the rod (5); a clamping portion (23) is provided at the edge of the fixing seat (21); the positioning slot (19) is clamped with the clamping portion (23); two leaf spring groups (14) are fixedly connected to one side of the fixing plate (13); a bracket is fixedly connected to one side of the fixing seat (21); a sensor assembly (20) is fixedly connected to the bracket; and a limiting plate (16) is fixedly connected to the upper end of the rectangular block (17); the limiting plate (16) is located on one side of the sensor assembly (20); The two opposite sides of the retaining plate are provided with clamping grooves, one side of the support rod (5) is provided with an assembly structure, and the assembly structure connects the two connected retaining plates through a tenon-and-mortise structure with an adjustable angle; The connecting plates (9) are provided in plurality and are used to connect the upper and lower retaining plates; The retaining plate is a double-layer structure and is provided with a plurality of riveting holes (8), each of which is provided with an anchor rod (37). A drainage channel is provided in the retaining plate, and drainage pipes are fixedly connected to opposite sides of the retaining plate, and the drainage pipes are in communication with the drainage channel.

2. The large deep foundation pit support system with a safety system according to claim 1 is characterized in that: The retaining plate is composed of an inner plate (1) and an outer plate (11); the side wall of the inner plate (1) is provided with a plurality of transverse protrusions; the side wall of the outer plate (11) is provided with a plurality of vertical protrusions; the inner plate (1) and the outer plate (11) are attached to each other and fixedly connected by bolts; the transverse protrusions and the vertical protrusions form a drainage channel of a tic-tac-toe structure; and the rivet hole (8) is provided at the junction of the transverse protrusion and the vertical protrusion.

3. The large deep foundation pit support system with a safety system according to claim 2 is characterized in that: A right-angle plate (35) is provided on one side of the outer plate (11); one side of the right-angle plate (35) is fixedly connected to one end of the inner plate (1); the other side of the right-angle plate (35) and one side of the outer plate (11) together form a clamping groove; the clamping groove is connected to the assembly structure; and a plurality of notches are provided on one side of the right-angle plate (35).

4. The large deep foundation pit support system with a safety system according to claim 3 is characterized in that: A partition plate (34) is fixedly connected to one side of the outer plate (11), one end of the partition plate (34) contacts one side of the inner plate (1), a drainage pipe is fixedly connected to one side of the right-angle plate (35), the pipe opening of the drainage pipe is located above the partition plate (34), a plurality of water seepage holes (33) are provided on the side wall of the outer plate (11), and a plurality of rectangular openings (12) are provided on the side wall of the outer plate (11) below the partition plate (34).

5. The large deep foundation pit support system with a safety system according to claim 2, characterized in that: The vertical protrusions and the side walls of the inner plate (1) together form a plurality of plug-in holes, and the plurality of plug-in holes are all trapezoidal in structure. Both ends of the connecting plate (9) are provided with inclined portions, a positioning protrusion (36) is provided in the middle of the connecting plate (9), and a notch is provided at the upper end of the outer plate (11), and the notch cooperates with the positioning protrusion (36).

6. The large deep foundation pit support system with a safety system according to claim 1, characterized in that: The assembly structure comprises two clamping blocks (30), one end of the support rod (5) is provided with two bent portions, the two bent portions are fixedly connected to the clamping block (30), the side wall of the clamping block (30) is sleeved with a C-shaped clamping strip (32), one side of the C-shaped clamping strip (32) is fixedly connected to a plug-in board (4), the side wall of the plug-in board (4) is provided with a folded edge (31), the plug-in board (4) is movably inserted into the clamping groove, one side of the support rod (5) is provided with a sleeve (29), a positioning rod (6) is sleeved in the sleeve (29), and one side of the sleeve (29) is threadedly connected with a bolt through a threaded hole.

7. The large deep foundation pit support system with a safety system according to claim 1, characterized in that: The anchor rod (37) is a tubular structure. The side wall of the anchor rod (37) is connected to a fixing nut (7) via an external thread. A gasket is provided on one side of the fixing nut (7). The side wall of the anchor rod (37) is provided with a plurality of grouting holes (40). One end of the anchor rod (37) is provided with a plurality of spiral openings (39) and is sleeved with a cylinder (38). One end of the cylinder (38) is a conical structure. A limiting rod is sleeved in the grouting hole (40). One end of the limiting rod is fixedly connected to one end of the cylinder (38).

8. The large deep foundation pit support system with a safety system according to claim 1, characterized in that: A pull rod (3) is provided on one side of the retaining plate, a plurality of ground nail through holes (26) are provided on the side wall of the pull rod (3), and a ground nail (10) is sleeved in the ground nail through hole (26), one end of the ground nail (10) is provided with two positioning blocks (24), one end of the telescopic rod (2) is rotatably connected to a fixing block (28) via a rotating shaft, and the fixing block (28) and the side wall of the pull rod (3) are both provided with positioning grooves (27) that match the positioning blocks (24), one end of the pull rod (3) is provided with a connecting plate (25), one side of the connecting plate (25) is provided with a connecting seat (15), the connecting seat (15) is fixed to one side of the support rod (5), and the connecting seat (15) and the connecting plate (25) are connected via the ground nail (10).

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