Foundation pit supporting structure and foundation pit supporting construction method

Abstract

The invention belongs to the technical field of foundation pit supporting, and discloses a foundation pit supporting structure which comprises a supporting anchor rod pipe body and is characterized in that a plurality of evenly-distributed limiting through holes are formed in the left side and the right side of the outer surface of the supporting anchor rod pipe body, and a coaxial disassembly and assembly recycling type operation rod is arranged in the middle of the supporting anchor rod pipe body in a penetrating mode; a plurality of tensile positioning short rods are movably connected to the side face of the disassembly and assembly recycling type operating rod and correspond to the limiting through holes in a one-to-one mode, and the ends, close to the axis of the supporting anchor rod pipe body, of the tensile positioning short rods are movably connected with the disassembly and assembly recycling type operating rod. The ends, away from the axis of the supporting anchor rod pipe body, of the tensile positioning short rods are movably connected into the limiting through holes in a sleeved mode. Due to the arrangement of the disassembly and assembly recovery operation rod, the recovery operation rod body is rotated under the limitation of the limiting through hole, and the tensile positioning short rod can be driven to move in the radial direction of the supporting anchor rod pipe body through the cooperation of the linkage sliding groove and the limiting clamping groove, so that the effects of supporting and convenient recovery are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of foundation pit support, and in particular relates to a foundation pit support structure and a foundation pit support construction method. Background Art

[0002] The foundation pit is an earth pit excavated at the foundation design position according to the base elevation and foundation plane dimensions. The foundation pit support is to protect the safety of underground structure construction and the surrounding environment of the foundation pit. The foundation pit support is an important link in the underground structure construction process. The current common foundation pit support method is anchor support, which is to drive the anchor into the pre-drilled hole in the foundation pit rock mass, and use the special structure of the head and rod body and the tail support plate (optional), or rely on the bonding effect to combine the surrounding rock with the stable rock mass to produce a suspension effect, a combined beam effect, and a reinforcement effect to achieve the purpose of support; the anchor support structure has the advantages of low cost, good support effect, simple operation, flexible use, and less construction clearance.

[0003] However, the existing support anchor structure is too simple. The support anchor is inserted into a pre-drilled hole and then mortar is poured to fix the anchor. However, since the anchor structure is too simple, the firmness after grouting is almost entirely dependent on the extrusion stress exerted by the mortar on the surface of the anchor. Once the concrete becomes loose, the adhesion on the surface of the anchor is almost completely lost, resulting in accelerated collapse. This cannot provide sufficient remedial time for the staff and poses a huge safety hazard. Moreover, the anchor that has been used stably after pouring the mortar is almost impossible to remove, and the effect of recycling and reuse cannot be achieved, resulting in a huge material loss. Therefore, it is necessary to develop a new anchor structure for foundation pit support to address the deficiencies in the prior art. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a foundation pit support structure and a foundation pit support construction method, which have the advantages of strong tensile resistance and easy recycling.

[0005] Among them, rotating the recovery operating rod body under the restriction of the limiting through hole can drive the anti-tension positioning short rod to move radially along the support anchor rod tube body through the cooperation of the linkage slide groove and the limiting slot, so that the recovery anti-tension rod body can be extended to the outside of the limiting through hole to contact the mortar poured on the outside of the support anchor rod tube body, thereby achieving the effect of stabilizing the support anchor rod tube body and the disassembly and assembly of the recovery operating rod as a whole. On the contrary, the recovery anti-tension rod body can be rotated back to the inside of the support anchor rod tube body, so as to facilitate the support anchor rod tube body to be drawn out from the poured mortar hole, thereby achieving the effect of recycling and reuse.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a foundation pit support structure, including a support anchor rod tube body, characterized in that: a plurality of evenly distributed limit through holes are opened on both sides of the outer surface of the support anchor rod tube body, a coaxial disassembly and recovery type operating rod is penetrated in the middle of the support anchor rod tube body, a plurality of tensile positioning short rods are movably connected to the side of the disassembly and recovery type operating rod, a plurality of tensile positioning short rods and the limit through holes correspond one to one, an end of the tensile positioning short rod close to the axis of the support anchor rod tube body is movably connected to the disassembly and recovery type operating rod, and an end of the tensile positioning short rod away from the axis of the support anchor rod tube body is movably sleeved inside the limit through hole;

[0007] The disassembly and recovery operating rod includes a recovery operating rod body that is penetrated through the middle part of the support anchor rod tube body. The cross-section of the recovery operating rod body is elliptical. A plurality of linkage slide grooves are provided on the outer surface of the recovery operating rod body. A linkage slide groove that is connected to the front and rear ends of the tensile adapter thread is provided inside the recovery operating rod body. One end of the linkage slide groove and the limit slot extends to the short axis end of the recovery operating rod body, and the other end of the linkage slide groove and the limit slot extends to the long axis end of the recovery operating rod body. One end of the tensile positioning short rod is movably connected to the inside of the linkage slide groove and the limit slot.

[0008] Preferably, the major axis dimension of the recovery operating rod body is matched with the inner diameter dimension of the supporting anchor rod tube body, and the maximum distance between the inner cavity of the linkage slide groove and the outer surface of the supporting anchor rod tube body is matched with the length dimension of the tensile positioning short rod.

[0009] Preferably, the anti-tensile positioning short rod includes a connecting shaft movably installed inside the linkage slide groove, and one end of the outer surface of the connecting shaft away from the axis of the recovery operating rod body is fixedly connected to a recovery anti-tensile rod body, and the other end of the recovery anti-tensile rod body is sleeved inside the limiting through hole, and the other end of the recovery anti-tensile rod body is flush with the outer surface of the support anchor rod tube body.

[0010] Preferably, both ends of the connecting shaft extend to the interior of the limit slot and are movably connected with a resistance reduction limit roller, the internal movably sleeve of the resistance reduction limit roller is connected with a rotating clamping shaft, the outer diameter of one end of the rotating clamping shaft close to the connecting shaft is smaller than the outer diameter of the other end, the end of the rotating clamping shaft close to the connecting shaft passes through the resistance reduction limit roller and is fixedly connected to the connecting shaft, and the outer diameter of the connecting shaft is smaller than the outer diameter of the resistance reduction limit roller.

[0011] Preferably, a support plate positioning assembly is passed through the middle of the recovery operating rod body, one end of the support plate positioning assembly passes through the recovery operating rod body and extends to one end of the support anchor rod tube body, and the other end of the support anchor rod tube body is connected to a resistance reduction cone head.

[0012] Preferably, the support plate positioning assembly includes a support connecting screw rod passing through the inside of the recovery operating rod body, one end of the support connecting screw rod is abutted against the resistance reduction cone head, the other end of the support connecting screw rod passes through the recovery operating rod body and extends to the outside of the support anchor rod tube body and is connected to a control pressure ring, and a grouting hole is opened in the middle of the support connecting screw rod and the control pressure ring, and the grouting hole is communicated with the inside of the resistance reduction cone head.

[0013] Preferably, the support connecting screw and the control pressure ring are threadedly connected, the inner walls of the two grouting holes in the support connecting screw and the control pressure ring are smoothly connected, the inner walls of the grouting holes in the support connecting screw are smoothly connected to the inner wall of the resistance reducing cone head, and the outer diameter of the control pressure ring is larger than the outer diameter of the support connecting screw.

[0014] Preferably, a slope support baffle is provided on the front side of the support anchor tube body, the support connecting screw is inserted into the slope support baffle, the control pressure ring and the support anchor tube body are respectively located on the front and rear sides of the slope support baffle, and a plurality of evenly distributed resistance reducing rollers are movably embedded in the side of the control pressure ring close to the slope support baffle.

[0015] Preferably, the interior of the recovery operating rod body is provided with a tensile adapter thread, and the outer surface of the support connecting screw is provided with a tensile connecting thread, the tensile connecting thread and the tensile adapter thread are meshed with each other, and the tensile connecting thread and the tensile adapter thread are cut into two parts symmetrical relative to the axis of the support connecting screw, and the distance between the two parts is greater than the width of the tensile adapter thread and the tensile connecting thread itself.

[0016] Preferably, the following steps are included:

[0017] S1. Fix the support anchor rod tube and rotate the control pressure ring to make one end of the support connection screw rod fit tightly with the resistance reduction cone head under the cooperation of the tensile connection thread and the tensile adapter thread;

[0018] S2. With the cooperation of the drag-reducing cone head, the support anchor rod tube body and the disassembly and recovery operating rod are integrally inserted into the pre-drilled foundation pit grouting support hole;

[0019] S3. The recovery operating rod body can be rotated to push the recovery anti-tension rod body through the connecting shaft, the resistance reduction limit roller and the rotating clamping shaft under the cooperation of the linkage slide groove and the limit clamping groove, so that the outer end of the recovery anti-tension rod body extends along the inside of the limit through hole to the outside of the support anchor rod tube body until the long axis of the recovery operating rod body is flush with the axis of the recovery anti-tension rod body;

[0020] S4. Pour mortar into the support hole through the grouting hole and the resistance reduction cone head;

[0021] S5. After the grouting is completed, the mortar remaining in the control pressure ring and the resistance reduction cone head is pushed into the grouting hole by vibrating with a short rod and compacted;

[0022] S6. During the grouting and curing period, the recovery operating rod body is reciprocated several times to make the recovery tension rod body come into active contact with the curing mortar until the grouting mortar is completely cured;

[0023] S7. Rotate the control pressure ring to disengage the tensile connection thread on the outer surface of the support connection screw from the tensile adapter thread. When the tensile connection thread and the tensile adapter thread are misaligned, the support connection screw can be quickly pulled out of the recovery operating rod body by pulling the control pressure ring until the front end of the support connection screw extends to the outside of the foundation pit surface;

[0024] S8. Unscrew the control pressure ring from the front end of the support connection screw, then put the slope support baffle on the front end of the support connection screw, and then tighten the control pressure ring to the front end of the support connection screw;

[0025] S9. Continue to tighten the control pressure ring to drive the support connection screw to rotate, so that the tensile connection thread engages with the tensile adapter thread, until the control pressure ring presses the slope support baffle onto the slope through the resistance reduction roller.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. Due to the provision of the disassembly and recovery operating rod of the present invention, the recovery operating rod body can be rotated under the restriction of the limiting through hole to drive the anti-tension positioning short rod to move radially along the supporting anchor rod tube body through the cooperation of the linkage slide groove and the limiting slot, so that the recovery anti-tension rod body can be extended to the outside of the limiting through hole to contact the mortar poured on the outside of the supporting anchor rod tube body, so as to achieve the effect of stabilizing the supporting anchor rod tube body and the disassembly and recovery operating rod as a whole. On the contrary, the recovery anti-tension rod body can be rotated back to the inside of the supporting anchor rod tube body, so as to facilitate the support anchor rod tube body to be drawn out from the poured mortar hole, so as to achieve the effect of recycling and reuse.

[0028] 2. In the present invention, since the tensile adapter thread and the tensile connecting thread are of notch-type design, the support plate positioning assembly can be directly moved after the tensile connecting thread and the tensile adapter thread are misaligned by rotating the support connecting screw, so as to achieve the effect of quickly adjusting the overall length of the support plate positioning assembly and the support anchor tube body. When the length is adapted to the position of the support baffle, the support plate positioning assembly can be rotated to make the misaligned tensile connecting thread and the tensile adapter thread engage again, so that the support connecting screw can tighten the support baffle through the tensile connecting thread and the tensile adapter thread under the obstruction of the support anchor tube body and the tensile positioning short rod.

[0029] 3. Due to the setting of the tensile connecting thread of the present invention, with the cooperation of the tensile adapter thread, the operator can screw the support connecting screw out to the outside of the support anchor rod tube body and the disassembly and recovery operating rod by operating the pressure ring, so that the overall length of the support anchor rod tube body and the support plate positioning assembly can be changed. Then, after grouting and fixing the support anchor rod tube body, the support plate positioning assembly can be adjusted to connect the support plate of the foundation pit slope and the support baffle can be processed by operating the pressure ring and compacted on the foundation pit slope, thereby achieving the effect of firmly supporting the slope. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure after installation of the present invention;

[0032] Figure 3 A sectional view of the side of the present invention;

[0033] Figure 4 is a cross-sectional view of the top of the present invention;

[0034] Figure 5 It is a structural schematic diagram of the support plate positioning assembly of the present invention;

[0035] Figure 6 It is a cross-sectional view of the front side of the present invention;

[0036] Figure 7 It is a cross-sectional schematic diagram of the tensile positioning short rod of the present invention.

[0037] In the figure: 1. Support anchor rod tube; 2. Limit through hole; 3. Disassembly and assembly recovery operating rod; 31. Recovery operating rod body; 32. Anti-tensile adapter thread; 33. Linkage slide; 34. Limit slot; 4. Anti-tensile positioning short rod; 41. Connecting shaft; 42. Recovery anti-tensile rod body; 43. Resistance reduction limit roller; 44. Rotating clamping shaft; 5. Support plate positioning assembly; 51. Support connection screw; 52. Control pressure ring; 53. Grouting hole; 54. Resistance reduction roller; 55. Anti-tensile connection thread; 6. Resistance reduction cone head. DETAILED DESCRIPTION

[0038] 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.

[0039] like Figures 1 to 7As shown, the present invention provides a foundation pit support structure, including a support anchor rod tube body 1, characterized in that: a plurality of evenly distributed limiting through holes 2 are opened on both sides of the outer surface of the support anchor rod tube body 1, a coaxial disassembly and recovery type operating rod 3 is penetrated in the middle of the support anchor rod tube body 1, a plurality of tensile positioning short rods 4 are movably connected to the side of the disassembly and recovery type operating rod 3, and the plurality of tensile positioning short rods 4 correspond to the limiting through holes 2 one by one, one end of the tensile positioning short rod 4 close to the axis of the support anchor rod tube body 1 is movably connected to the disassembly and recovery type operating rod 3, and one end of the tensile positioning short rod 4 away from the axis of the support anchor rod tube body 1 is movably sleeved inside the limiting through hole 2;

[0040] The disassembly and recovery operating rod 3 includes a recovery operating rod body 31 which is penetrated in the middle of the supporting anchor rod tube body 1. The cross section of the recovery operating rod body 31 is elliptical. A plurality of linkage slide grooves 33 are provided on the outer surface of the recovery operating rod body 31. The interior of the recovery operating rod body 31 is provided with a linkage slide groove 33 which is connected to the front and rear ends of the tensile adapter thread 32. One end of the linkage slide groove 33 and the limit card groove 34 extend to the short axis end of the recovery operating rod body 31, and the other end of the linkage slide groove 33 and the limit card groove 34 extend to the long axis end of the recovery operating rod body 31. One end of the tensile positioning short rod 4 is movably connected to the inside of the linkage slide groove 33 and the limit card groove 34. Regarding the setting of the disassembly and recovery operating rod 3, the recovery operating rod body 31 can be rotated under the restriction of the limiting through hole 2 to drive the anti-tension positioning short rod 4 to move radially along the support anchor rod tube body 1 through the cooperation of the linkage slide groove 33 and the limiting slot 34, so that the recovery anti-tension rod body 42 can be extended to the outside of the limiting through hole 2 to contact the mortar poured on the outside of the support anchor rod tube body 1, so as to achieve the effect of stabilizing the support anchor rod tube body 1 and the disassembly and recovery operating rod 3 as a whole. On the contrary, the recovery anti-tension rod body 42 can be rotated back to the inside of the support anchor rod tube body 1, so as to facilitate the support anchor rod tube body 1 to be drawn out from the poured mortar hole, so as to achieve the effect of recycling and reuse.

[0041] like Figure 6 As shown, the major axis size of the recovery operating rod body 31 is adapted to the inner diameter size of the support anchor rod tube body 1, and the maximum distance between the inner cavity of the linkage slide groove 33 and the outer surface of the support anchor rod tube body 1 is adapted to the length size of the anti-tensile positioning short rod 4; due to the setting of the recovery operating rod body 31, rotating the recovery operating rod body 31 can drive the anti-tensile positioning short rod 4 to move radially along the support anchor rod tube body 1 through the linkage slide groove 33 and the limit slot 34, so that the outer end of the anti-tensile positioning short rod 4 extends to the outside of the support anchor rod tube body 1, and at the same time, the outer end of the anti-tensile positioning short rod 4 can be retracted to the inside of the support anchor rod tube body 1, thereby achieving the effect of reinforcement and recovery.

[0042] like Figure 6 and Figure 7As shown, the anti-tensile positioning short rod 4 includes a connecting shaft 41 movably installed inside the linkage slide groove 33, and one end of the outer surface of the connecting shaft 41 away from the axis of the recovery operating rod body 31 is fixedly connected to a recovery anti-tensile rod body 42, and the other end of the recovery anti-tensile rod body 42 is sleeved inside the limiting through hole 2, and the other end of the recovery anti-tensile rod body 42 is flush with the outer surface of the support anchor tube body 1.

[0043] like Figure 7 As shown, both ends of the connecting shaft 41 extend to the interior of the limit slot 34 and are movably connected with a resistance reducing limit roller 43, and the interior of the resistance reducing limit roller 43 is movably sleeved with a rotating clamping shaft 44, and the outer diameter of one end of the rotating clamping shaft 44 close to the connecting shaft 41 is smaller than the outer diameter of the other end thereof, and the end of the rotating clamping shaft 44 close to the connecting shaft 41 passes through the resistance reducing limit roller 43 and is fixedly connected to the connecting shaft 41, and the outer diameter of the connecting shaft 41 is smaller than the outer diameter of the resistance reducing limit roller 43; due to the setting of the rotating clamping shaft 44, the resistance reducing limit roller 43 can rotate smoothly in the limit slot 34, thereby reducing the friction resistance between the anti-tensile positioning short rod 4 and the linkage slide slot 33 and the limit slot 34, ensuring that the recovery operating rod body 31 can smoothly drive the anti-tensile positioning short rod 4 to move when it rotates.

[0044] like Figure 3 , Figure 4 and Figure 5 As shown, a support plate positioning assembly 5 is passed through the middle of the recovery operating rod body 31, one end of the support plate positioning assembly 5 passes through the recovery operating rod body 31 and extends to one end of the support anchor rod tube body 1, and the other end of the support anchor rod tube body 1 is connected to a resistance reduction cone head 6.

[0045] like Figure 3 and Figure 4 As shown, the support plate positioning assembly 5 includes a support connecting screw 51 that is penetrated through the inside of the recovery operating rod body 31, one end of the support connecting screw 51 is abutted against the resistance reducing cone head 6, and the other end of the support connecting screw 51 passes through the recovery operating rod body 31 and extends to the outside of the support anchor rod tube body 1 and is connected to a control pressure ring 52, and a grouting hole 53 is opened in the middle of the support connecting screw 51 and the control pressure ring 52, and the grouting hole 53 is communicated with the inside of the resistance reducing cone head 6; due to the provision of the control pressure ring 52, it is convenient to control the support connecting screw 51, and with the cooperation of the support connecting screw 51 and the disassembly and recovery operating rod 3, it is also convenient to press the slope support baffle through the control pressure ring 52 to achieve the effect of foundation pit support.

[0046] like Figures 3 to 5As shown, the support connection screw 51 and the control pressure ring 52 are threadedly connected, the inner walls of the two grouting holes 53 in the support connection screw 51 and the control pressure ring 52 are smoothly connected, the inner walls of the grouting holes 53 in the support connection screw 51 are smoothly connected to the inner wall of the resistance reduction cone head 6, and the outer diameter of the control pressure ring 52 is larger than the outer diameter of the support connection screw 51.

[0047] like Figure 2 and Figure 5 As shown, a slope support baffle is arranged on the front of the support anchor rod tube body 1, the support connecting screw 51 is inserted into the slope support baffle, the control pressure ring 52 and the support anchor rod tube body 1 are respectively located on the front and rear sides of the slope support baffle, and a plurality of evenly distributed resistance reducing rollers 54 are movably embedded on the side of the control pressure ring 52 close to the slope support baffle; due to the setting of the resistance reducing rollers 54, the friction resistance between the control pressure ring 52 and the slope support baffle can be reduced, so that the staff can smoothly rotate the control pressure ring 52.

[0048] like Figure 3 and Figure 5 As shown, the interior of the recovery operating rod body 31 is provided with a tensile adapter thread 32, and the outer surface of the support connection screw 51 is provided with a tensile connection thread 55, the tensile connection thread 55 and the tensile adapter thread 32 are meshed with each other, and the tensile connection thread 55 and the tensile adapter thread 32 are cut into two parts that are symmetrical relative to the axis of the support connection screw 51, and the distance between the two parts is greater than the width of the tensile adapter thread 32 and the tensile connection thread 55 itself; due to the setting of the tensile connection thread 55, with the cooperation of the tensile adapter thread 32, the operator can screw the support connection screw 51 out to the outside of the support anchor rod pipe body 1 and the disassembly and recovery operating rod 3 by manipulating the pressure ring 52, so that the overall length of the support anchor rod pipe body 1 and the support plate positioning assembly 5 can be changed, and then the support anchor rod pipe body 1 can be fixed by grouting and adjusted. The support plate positioning assembly 5 can be connected to the support plate of the foundation pit slope and the support baffle can be processed and compacted on the foundation pit slope by manipulating the pressure ring 52, so as to achieve the effect of firmly supporting the slope; since the tensile adapting thread 32 and the tensile connecting thread 55 are notched-type designs, the support connecting screw 51 is rotated to make the tensile connecting thread 55 and the tensile adapting thread 32 misaligned, and the support plate positioning assembly 5 can be directly moved to achieve the effect of quickly adjusting the overall length of the support plate positioning assembly 5 and the support anchor tube body 1. When the length is adapted to the position of the support baffle, the support plate positioning assembly 5 can be rotated to make the misaligned tensile connecting thread 55 and the tensile adapting thread 32 engage again, so that the support connecting screw 51 can tighten the support baffle through the tensile connecting thread 55 and the tensile adapting thread 32 under the obstruction of the support anchor tube body 1 and the tensile positioning short rod 4.

[0049] like Figures 1 to 7 As shown, the following steps are included:

[0050] S1. Fix the support anchor body 1 and rotate the control pressure ring 52 to make one end of the support connection screw 51 fit closely with the resistance reduction cone head 6 under the cooperation of the tensile connection thread 55 and the tensile adapter thread 32;

[0051] S2. With the cooperation of the drag reducing cone head 6, the support anchor tube body 1 and the disassembly and recovery operating rod 3 are inserted as a whole into the pre-drilled foundation pit grouting support hole;

[0052] S3. The recovery operating rod body 31 can be rotated to push the recovery anti-tension rod body 42 through the connecting shaft 41, the resistance reduction limit roller 43 and the rotating clamping shaft 44 under the cooperation of the linkage slide groove 33 and the limit card groove 34, so that the outer end of the recovery anti-tension rod body 42 extends along the inside of the limit through hole 2 to the outside of the support anchor rod tube body 1 until the long axis of the recovery operating rod body 31 is flush with the axis of the recovery anti-tension rod body 42;

[0053] S4. Pour mortar into the support hole through the grouting hole 53 and the resistance reduction cone head 6;

[0054] S5. After the grouting is completed, the remaining mortar in the control pressure ring 52 and the resistance reduction cone head 6 is pushed into the grouting hole and compacted by vibrating the short rod;

[0055] S6. During the grouting and curing period, the recovery operating rod body 31 is reciprocated several times to make the recovery tension rod body 42 in contact with the curing mortar until the grouting mortar is completely cured;

[0056] S7. Rotate the control pressure ring 52 to disengage the tensile connection thread 55 on the outer surface of the support connection screw 51 from the tensile adapter thread 32. When the tensile connection thread 55 and the tensile adapter thread 32 are misaligned, the control pressure ring 52 can be pulled out to quickly pull the support connection screw 51 out of the recovery operating rod body 31 until the front end of the support connection screw 51 extends to the outside of the foundation pit surface;

[0057] S8. The control pressure ring 52 is unscrewed from the front end of the support connecting screw 51, and then the slope support baffle is sleeved on the front end of the support connecting screw 51, and then the control pressure ring 52 is tightened to the front end of the support connecting screw 51;

[0058] S9. Continue to tighten the control pressure ring 52 to drive the support connection screw 51 to rotate, so that the tensile connection thread 55 is engaged with the tensile adapter thread 32, until the control pressure ring 52 presses the slope support baffle onto the slope through the resistance reduction roller 54.

[0059] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[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 foundation pit support structure, comprising a support anchor rod tube body (1), characterized in that: A plurality of evenly distributed limiting through holes (2) are provided on both sides of the outer surface of the supporting anchor rod tube body (1); a coaxial disassembly and recovery type operating rod (3) is provided in the middle of the supporting anchor rod tube body (1); a plurality of tensile positioning short rods (4) are movably connected to the side of the disassembly and recovery type operating rod (3); the plurality of tensile positioning short rods (4) correspond to the limiting through holes (2) in a one-to-one manner; one end of the tensile positioning short rod (4) close to the axis of the supporting anchor rod tube body (1) is movably connected to the disassembly and recovery type operating rod (3); and one end of the tensile positioning short rod (4) away from the axis of the supporting anchor rod tube body (1) is movably sleeved inside the limiting through hole (2); The disassembly and recovery operating rod (3) comprises a recovery operating rod body (31) which is penetrated through the middle of the supporting anchor rod tube body (1); the cross section of the recovery operating rod body (31) is elliptical; a plurality of linkage sliding grooves (33) are provided on the outer surface of the recovery operating rod body (31); a linkage sliding groove (33) which is connected to the front and rear ends of the tensile adapter thread (32) is provided inside the recovery operating rod body (31); one end of the linkage sliding groove (33) and the limiting groove (34) extend to the short axis end of the recovery operating rod body (31); the other end of the linkage sliding groove (33) and the limiting groove (34) extend to the long axis end of the recovery operating rod body (31); one end of the tensile positioning short rod (4) is movably connected to the inside of the linkage sliding groove (33) and the limiting groove (34).

2. A foundation pit support structure according to claim 1, characterized in that: The major axis dimension of the recovery operating rod body (31) is compatible with the inner diameter dimension of the supporting anchor rod tube body (1), and the maximum distance between the inner cavity of the linkage slide groove (33) and the outer surface of the supporting anchor rod tube body (1) is compatible with the length dimension of the tensile positioning short rod (4).

3. A foundation pit support structure according to claim 1, characterized in that: The anti-tensile positioning short rod (4) includes a connecting shaft (41) movably installed inside the linkage slide groove (33), and one end of the outer surface of the connecting shaft (41) away from the axis of the recovery operating rod body (31) is fixedly connected to a recovery anti-tensile rod body (42), and the other end of the recovery anti-tensile rod body (42) is sleeved inside the limiting through hole (2), and the other end of the recovery anti-tensile rod body (42) is flush with the outer surface of the support anchor rod tube body (1).

4. A foundation pit support structure according to claim 3, characterized in that: Both ends of the connecting shaft (41) extend to the interior of the limit slot (34) and are movably connected to a resistance-reducing limit roller (43); a rotating clamping shaft (44) is movably sleeved inside the resistance-reducing limit roller (43); an outer diameter of one end of the rotating clamping shaft (44) close to the connecting shaft (41) is smaller than an outer diameter of the other end; an end of the rotating clamping shaft (44) close to the connecting shaft (41) passes through the resistance-reducing limit roller (43) and is fixedly connected to the connecting shaft (41); an outer diameter of the connecting shaft (41) is smaller than an outer diameter of the resistance-reducing limit roller (43).

5. A foundation pit support structure according to claim 1, characterized in that: A support plate positioning assembly (5) is provided in the middle of the recovery operating rod body (31), one end of the support plate positioning assembly (5) passes through the recovery operating rod body (31) and extends to one end of the support anchor rod tube body (1), and the other end of the support anchor rod tube body (1) is connected to a resistance reduction cone head (6).

6. A foundation pit support structure according to claim 5, characterized in that: The support plate positioning assembly (5) comprises a support connecting screw (51) which is inserted into the inside of the recovery operating rod body (31); one end of the support connecting screw (51) is abutted against the resistance reducing cone head (6); the other end of the support connecting screw (51) passes through the recovery operating rod body (31) and extends to the outside of the support anchor rod tube body (1) and is connected to a control pressure ring (52); a grouting hole (53) is provided in the middle of the support connecting screw (51) and the control pressure ring (52); and the grouting hole (53) is communicated with the inside of the resistance reducing cone head (6).

7. A foundation pit supporting structure according to claim 6, characterized in that: The support connection screw (51) and the control pressure ring (52) are threadedly sleeved, the inner walls of the two grouting holes (53) in the support connection screw (51) and the control pressure ring (52) are smoothly connected, the inner walls of the grouting holes (53) in the support connection screw (51) are smoothly connected to the inner wall of the resistance reduction cone head (6), and the outer diameter of the control pressure ring (52) is larger than the outer diameter of the support connection screw (51).

8. A foundation pit supporting structure according to claim 6, characterized in that: A slope support baffle is arranged on the front of the support anchor rod tube body (1), the support connection screw rod (51) is inserted into the slope support baffle, the control pressure ring (52) and the support anchor rod tube body (1) are respectively located on the front and rear sides of the slope support baffle, and a plurality of evenly distributed resistance reduction rollers (54) are movably embedded on the side of the control pressure ring (52) close to the slope support baffle.

9. A foundation pit supporting structure according to claim 6, characterized in that: The interior of the recovery operating rod body (31) is provided with a tensile adapter thread (32), and the outer surface of the support connection screw (51) is provided with a tensile connection thread (55), the tensile connection thread (55) and the tensile adapter thread (32) are meshed with each other, and the tensile connection thread (55) and the tensile adapter thread (32) are cut into two parts that are symmetrical relative to the axis of the support connection screw (51), and the distance between the two parts is greater than the width of the tensile adapter thread (32) and the tensile connection thread (55) themselves.

10. A foundation pit support structure and a foundation pit support construction method according to claims 1-9, characterized in that: The following steps are included: S1. Fix the support anchor rod tube (1) and rotate the control pressure ring (52) to make one end of the support connection screw (51) fit tightly with the resistance reduction cone head (6) under the cooperation of the tensile connection thread (55) and the tensile adapter thread (32); S2. With the cooperation of the drag reducing cone head (6), the support anchor tube (1) and the disassembly and recovery operating rod (3) are inserted as a whole into the pre-drilled foundation pit grouting support hole; S3. The recovery operating rod body (31) can be rotated to push the recovery anti-tension rod body (42) through the connecting shaft (41), the resistance reduction limit roller (43) and the rotating clamping shaft (44) under the cooperation of the linkage slide groove (33) and the limit clamping groove (34), so that the outer end of the recovery anti-tension rod body (42) extends along the inside of the limit through hole (2) to the outside of the support anchor rod tube body (1) until the long axis of the recovery operating rod body (31) is flush with the axis of the recovery anti-tension rod body (42); S4. Pour mortar into the support hole through the grouting hole (53) and the resistance reduction cone head (6); S5. After the grouting is completed, the remaining mortar in the control pressure ring (52) and the resistance reduction cone head (6) is pushed into the grouting hole and compacted by vibrating the short rod; S6. During the grouting and curing period, the recovery operating rod body (31) is reciprocated several times to make the recovery tension rod body (42) come into contact with the curing mortar until the grouting mortar is completely cured; S7. Rotate the control pressure ring (52) to disengage the tensile connection thread (55) on the outer surface of the support connection screw rod (51) from the tensile adapter thread (32). When the tensile connection thread (55) and the tensile adapter thread (32) are misaligned, the control pressure ring (52) can be pulled out to quickly extract the support connection screw rod (51) from the recovery operating rod body (31) until the front end of the support connection screw rod (51) extends to the outside of the foundation pit surface; S8. Unscrew the control pressure ring (52) from the front end of the support connecting screw (51), then put the slope support baffle on the front end of the support connecting screw (51), and then tighten the control pressure ring (52) to the front end of the support connecting screw (51); S9. Continue to tighten the control pressure ring (52) to drive the support connection screw (51) to rotate, so that the tensile connection thread (55) is engaged with the tensile adapter thread (32), until the control pressure ring (52) presses the slope support baffle onto the slope through the resistance reduction roller (54).

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