Prefabricated foundation pit support system and construction method thereof

Abstract

The prefabricated foundation pit support system comprises a supporting rod, sawtooth component clamping plates are movably connected to the two ends of the supporting rod, and prefabricated metal components are arranged in the sawtooth component clamping plates in a clamped mode; the supporting rod comprises a first movable block, a first metal pipe, a second metal pipe, a third metal pipe, a fourth metal pipe, a second movable block, a first bolt, a second bolt, a third bolt and a fourth bolt. According to the prefabricated foundation pit support system and the construction method thereof, the lengths of the supporting rods can be adjusted, the adjusting mode is simple, the supporting rods can be installed and fixed between the sawtooth component clamping plates at different inclination angles and are more flexible, the combination process of a soil retaining structure is more convenient through the sawtooth component clamping plates and the prefabricated metal components, and the construction efficiency is improved. The combination process is more labor-saving, the combined wall is more tidy and straight, the combined structure is firmer, and the prefabricated metal components do not need to be connected one by one through tenon-and-mortise structures.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated foundation pit retaining system structures, and particularly relates to a prefabricated foundation pit retaining system and a construction method thereof. Background Art

[0002] The prefabricated foundation pit retaining system is an efficient and environmentally friendly foundation pit support technology, which is widely used in projects such as urban rail transit and building foundations. The system consists of a soil retaining structure and a support structure. The soil retaining structure is arranged on both sides of the foundation pit and is used to bear the lateral load of the foundation pit. It is usually composed of several prefabricated metal components, and the components are connected through mortise and tenon structures to form a continuous wall. The support structure is used to balance the lateral load borne by the soil retaining structure, including several prefabricated support components. Both ends of the components are provided with connecting parts, which are connected to the soil retaining structure through sliding grooves and fixed by fixing parts;

[0003] However, there are several problems in the existing prefabricated foundation pit retaining system during use. First, the soil retaining structure is connected through mortise and tenon structures and then directly attached to the inner wall of the foundation pit. There is no support structure inside the prefabricated metal components, and the formed wall is prone to bending deformation and is not firm enough. Second, the prefabricated metal components need to be connected one by one through mortise and tenon structures, and continuous knocking and combination are required, which is not labor-saving. Third, it is not easy to adjust the length of the support rod. When adjusting, the two ends need to be cut, and the installation of the support structure is not flexible enough. Summary of the Invention

[0004] The main purpose of the present invention is to provide a prefabricated foundation pit retaining system and a construction method thereof, which can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A prefabricated foundation pit retaining system includes a support rod, and serrated component clamping plates are movably connected to both ends of the support rod, and prefabricated metal components are clamped inside the serrated component clamping plates.

[0007] Preferably, the support rod includes a first movable block, a first metal pipe, a second metal pipe, a third metal pipe, a fourth metal pipe, a second movable block, a first bolt, a second bolt, a third bolt, and a fourth bolt.

[0008] Preferably, the first metal pipe is fixedly installed on the rear surface of the first movable block, the second metal pipe is sleeved on the rear end of the first metal pipe, the third metal pipe is inserted into the rear end of the second metal pipe, the fourth metal pipe is sleeved on the rear end of the third metal pipe, and the second movable block is fixedly installed on the rear end of the fourth metal pipe.

[0009] Preferably, the first bolt is disposed inside the first movable block and the second movable block, the second bolt is disposed in the through hole at the front end of the second metal tube, the third bolt is disposed in the through hole at the rear end of the second metal tube, the fourth bolt is disposed in the through hole at the front end of the fourth metal tube. Through holes are provided on the upper and lower surfaces of the first metal tube, the second metal tube, the third metal tube, and the fourth metal tube. The number of through holes provided on the upper and lower surfaces of the first metal tube, the second metal tube, the third metal tube, and the fourth metal tube is several. The through holes on the upper and lower surfaces of the first metal tube, the second metal tube, the third metal tube, and the fourth metal tube are evenly distributed. The lower end of the second bolt passes through the through hole at the rear end of the first metal tube, and the lower end of the third bolt passes through the through hole at the front end of the third metal tube. The lower end of the fourth bolt passes through the through hole at the rear end of the third metal tube.

[0010] Preferably, the serrated member splint includes a C-shaped metal strip, a metal base plate, a first toothed plate, a limit bolt, a limit strip, and a second toothed plate.

[0011] Preferably, the first toothed plate is fixedly installed at a position on the front surface of the C-shaped metal strip near the edge. The number of installed first toothed plates is several, and the first toothed plates are evenly distributed at a position on the front surface of the C-shaped metal strip near the edge. Through holes are provided on the upper and lower surfaces of the C-shaped metal strip. The number of through holes provided on the upper and lower surfaces of the C-shaped metal strip is several, and the through holes on the upper and lower surfaces of the C-shaped metal strip are evenly distributed. The front end of the second movable block and the first bolt is inserted into the inside of the C-shaped metal strip, and both ends of the first bolt are inserted into the through holes on the upper and lower surfaces of the C-shaped metal strip.

[0012] Preferably, the limit bolt is fixedly installed on the rear surface of the metal base plate, the limit strip is fixedly installed on the front surface of the metal base plate, the second toothed plate is fixedly installed at a position on the rear surface of the metal base plate near the edge. The number of installed second toothed plates is several, and the second toothed plates are evenly distributed at a position on the rear surface of the metal base plate near the edge. The number of limit strips installed on the front surface of the metal base plate is three, and the limit strips are evenly distributed on the front surface of the metal base plate. The front end of the limit bolt passes through the through holes on the front surfaces of the C-shaped metal strip and the prefabricated metal member. The prefabricated metal member is located between the first toothed plate and the second toothed plate.

[0013] A prefabricated foundation pit retaining system and its construction method include the following steps:

[0014] S1. The limit strip is inserted into the soil on the inner wall of the foundation pit, the metal base plate is attached to the inner wall of the foundation pit. When placing the prefabricated metal member, it is placed one positive and one negative on the outside of the second toothed plate, and the sides of the prefabricated metal members are abutted together;

[0015] S2. Unscrew the nut at the front end of the limit bolt. Insert the first tooth plate into the interior of the precast metal member, and insert the front end of the limit bolt into the through hole on the front surface of the C-shaped metal strip. Then, put on the nut at the front end of the limit bolt and tighten it. The precast metal member is clamped between the C-shaped metal strip and the metal base plate. The first tooth plate and the second tooth plate are responsible for supporting the interior of the precast metal member, and the lower end of the precast metal member abuts against the bottom of the foundation pit.

[0016] S3. According to the required length of the support rod, disassemble and assemble the second bolt, the third bolt and the fourth bolt, adjust the positions of the second bolt, the third bolt and the fourth bolt, and recombine the first metal pipe, the second metal pipe, the third metal pipe and the fourth metal pipe. The number of the second metal pipe and the third metal pipe can be increased or decreased. After adjustment, tighten the nuts of the second bolt, the third bolt and the fourth bolt.

[0017] S4. Insert the front ends of the second movable block and the first movable block into the corresponding positions inside the C-shaped metal strip, align the through holes of the first movable block and the second movable block with the through holes at the corresponding positions inside the C-shaped metal strip, and fix them with the first bolt.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In the present invention, through the provided support rod and the serrated member clamping plate, the length of the support rod can be adjusted, and the adjustment method is simple. The support rod can be installed and fixed between the serrated member clamping plates at different inclination angles, which is more flexible.

[0020] Through the provided serrated member clamping plate and the precast metal member, the serrated member clamping plate and the precast metal member make the combination process of the retaining structure more convenient, more labor-saving, the combination method is simpler, the wall is more neat and straight after combination, the combination structure is more firm, and the precast metal members do not need to be connected piece by piece through the mortise and tenon structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the overall structural schematic diagram of a precast foundation pit retaining system and its construction method of the present invention;

[0022] Figure 2 is the structural exploded view of the support rod of a precast foundation pit retaining system and its construction method of the present invention;

[0023] Figure 3 is the structural exploded view of the serrated member clamping plate of a precast foundation pit retaining system and its construction method of the present invention;

[0024] Figure 4 is the structural schematic diagram of the precast metal member of a precast foundation pit retaining system and its construction method of the present invention;

[0025] Figure 5For a prefabricated foundation pit retaining system and its construction method of the present invention Figure 1 Enlarged schematic view of part A in

[0026] Figure 6 For a prefabricated foundation pit retaining system and its construction method of the present invention Figure 1 Enlarged schematic view of part B in

[0027] Figure 7 For a prefabricated foundation pit retaining system and its construction method of the present invention Figure 1 Enlarged schematic view of part C in

[0028] Figure 8 For a prefabricated foundation pit retaining system and its construction method of the present invention Figure 1 Enlarged schematic view of part D in

[0029] In the figure: 1. Support rod; 101. First movable block; 102. First metal pipe; 103. Second metal pipe; 104. Third metal pipe; 105. Fourth metal pipe; 106. Second movable block; 107. First bolt; 108. Second bolt; 109. Third bolt; 110. Fourth bolt; 2. Serrated member splint; 201. C-shaped metal strip; 202. First tooth plate; 203. Metal bottom plate; 204. Limit bolt; 205. Limit strip; 206. Second tooth plate; 3. Prefabricated metal member. Detailed implementation manners

[0030] To make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with the detailed implementation manners.

[0031] As Figure 1-8 shown, a prefabricated foundation pit retaining system includes a support rod 1. The two ends of the support rod 1 are movably connected with serrated member splints 2. A prefabricated metal member 3 is clamped inside the serrated member splints 2. The length of the support rod 1 can be adjusted, and the adjustment method is simple. The support rod 1 can be installed and fixed between the serrated member splints 2 at different inclination angles, which is more flexible. The serrated member splints 2 and the prefabricated metal member 3 make the combination process of the retaining structure more convenient, more labor-saving, and the combination method is simpler. After the combination, the wall is more neat and straight, and the combined structure is more firm. The prefabricated metal members 3 do not need to be connected one by one through tenon and mortise structures.

[0032] The support rod 1 includes a first movable block 101, a first metal tube 102, a second metal tube 103, a third metal tube 104, a fourth metal tube 105, a second movable block 106, a first bolt 107, a second bolt 108, a third bolt 109 and a fourth bolt 110; the first metal tube 102 is fixedly installed on the rear surface of the first movable block 101, the second metal tube 103 is sleeved on the rear end of the first metal tube 102, the third metal tube 104 is inserted into the rear end of the second metal tube 103, the fourth metal tube 105 is sleeved on the rear end of the third metal tube 104, and the second movable block 106 is fixedly installed on the rear end of the fourth metal tube 105; the first bolt 107 is arranged inside the first movable block 101 and the second movable block 106, the second bolt 108 is arranged in the through hole at the front end of the second metal tube 103, the third bolt 109 is arranged in the through hole at the rear end of the second metal tube 103, the fourth bolt 110 is arranged in the through hole at the front end of the fourth metal tube 105, through holes are formed in the upper and lower surfaces of the first metal tube 102, the second metal tube 103, the third metal tube 104 and the fourth metal tube 105, the number of through holes formed in the upper and lower surfaces of the first metal tube 102, the second metal tube 103, the third metal tube 104 and the fourth metal tube 105 is several, the through holes formed in the upper and lower surfaces of the first metal tube 102, the second metal tube 103, the third metal tube 104 and the fourth metal tube 105 are evenly distributed, the lower end of the second bolt 108 passes through the through hole at the rear end of the first metal tube 102, the lower end of the third bolt 109 passes through the through hole at the front end of the third metal tube 104, and the lower end of the fourth bolt 110 passes through the through hole at the rear end of the third metal tube 104; the serrated member clamp plate 2 includes a C-shaped metal strip 201, a first tooth plate 202, a metal bottom plate 203, a limit bolt 204, a limit strip 205 and a second tooth plate 206; the first tooth plate 202 is fixedly installed at the edge position on the front surface of the C-shaped metal strip 201, the number of the first tooth plates 202 installed is several, the first tooth plates 202 are evenly distributed at the edge position on the front surface of the C-shaped metal strip 201, through holes are formed in the upper and lower surfaces of the C-shaped metal strip 201, the number of through holes formed in the upper and lower surfaces of the C-shaped metal strip 201 is several, the through holes formed in the upper and lower surfaces of the C-shaped metal strip 201 are evenly distributed, the front ends of the second movable block 106 and the first bolt 107 are inserted into the inside of the C-shaped metal strip 201, and both ends of the first bolt 107 are inserted into the through holes on the upper and lower surfaces of the C-shaped metal strip 201;The limit bolt 204 is fixedly installed on the rear surface of the metal base plate 203. The limit strip 205 is fixedly installed on the front surface of the metal base plate 203. The second toothed plate 206 is fixedly installed at the edge position on the rear surface of the metal base plate 203. The number of the second toothed plates 206 installed is several, and the second toothed plates 206 are evenly distributed at the edge position on the rear surface of the metal base plate 203. The number of the limit strips 205 installed on the front surface of the metal base plate 203 is three, and the limit strips 205 are evenly distributed on the front surface of the metal base plate 203. The front end of the limit bolt 204 passes through the through hole on the front surface of the C-shaped metal strip 201 and the precast metal member 3. The precast metal member 3 is located between the first toothed plate 202 and the second toothed plate 206.;

[0033] A precast foundation pit retaining system and its construction method include the following steps: S1. The limit strip 205 is inserted into the soil on the inner wall of the foundation pit, and the metal base plate 203 is attached to the inner wall of the foundation pit. When placing the precast metal member 3, it is placed one positive and one negative on the outside of the second toothed plate 206, and the sides of the precast metal members 3 are abutted together;

[0034] S2. Unscrew the nut at the front end of the limit bolt 204, insert the first toothed plate 202 into the inside of the precast metal member 3, insert the front end of the limit bolt 204 into the through hole on the front surface of the C-shaped metal strip 201, then put on the nut at the front end of the limit bolt 204 and tighten it. The precast metal member 3 is clamped between the C-shaped metal strip 201 and the metal base plate 203. The first toothed plate 202 and the second toothed plate 206 are responsible for supporting the inside of the precast metal member 3, and the lower end of the precast metal member 3 abuts against the bottom of the foundation pit; S3. According to the required length of the support rod 1, disassemble and assemble the second bolt 108, the third bolt 109 and the fourth bolt 110, adjust the positions of the second bolt 108, the third bolt 109 and the fourth bolt 110, and recombine the first metal pipe 102, the second metal pipe 103, the third metal pipe 104 and the fourth metal pipe 105. The number of the second metal pipe 103 and the third metal pipe 104 can be increased or decreased. After adjustment, tighten the nuts of the second bolt 108, the third bolt 109 and the fourth bolt 110; S4. The front ends of the second movable block 106 and the first movable block 101 are inserted into the corresponding positions inside the C-shaped metal strip 201, align the through holes of the first movable block 101 and the second movable block 106 with the through holes at the corresponding positions inside the C-shaped metal strip 201, and fix them with the first bolt 107.

[0035] It should be noted that the present invention is a prefabricated foundation pit retaining system and its construction method. When in use, during the process of combining the retaining structure, the limiting strip 205 is inserted into the soil on the inner wall of the foundation pit, and the metal bottom plate 203 is attached to the inner wall of the foundation pit. When placing the prefabricated metal member 3, it is placed one positive and one negative on the outside of the second toothed plate 206, and the sides of the prefabricated metal member 3 are abutted together. When fixing the prefabricated metal member 3, the nut at the front end of the limiting bolt 204 is unscrewed, the first toothed plate 202 is inserted into the inside of the prefabricated metal member 3, and the front end of the limiting bolt 204 is inserted into the through hole on the front surface of the C-shaped metal strip 201. Subsequently, a nut is sleeved on the front end of the limiting bolt 204 and tightened. The prefabricated metal member 3 is clamped between the C-shaped metal strip 201 and the metal bottom plate 203. The first toothed plate 202 and the second toothed plate 206 are responsible for supporting the inside of the prefabricated metal member 3. The lower end of the prefabricated metal member 3 abuts against the bottom of the foundation pit. During the installation of the support structure, according to the required length of the support rod 1, the second bolt 108, the third bolt 109 and the fourth bolt 110 are disassembled and assembled, and the positions of the second bolt 108, the third bolt 109 and the fourth bolt 110 are adjusted. The first metal tube 102, the second metal tube 103, the third metal tube 104 and the fourth metal tube 105 are recombined. The number of the second metal tube 103 and the third metal tube 104 can be increased or decreased. After the adjustment is completed, the nuts of the second bolt 108, the third bolt 109 and the fourth bolt 110 are tightened. The front ends of the second movable block 106 and the first movable block 101 are inserted into the corresponding positions inside the C-shaped metal strip 201, so that the through holes of the first movable block 101 and the second movable block 106 are aligned with the through holes at the corresponding positions inside the C-shaped metal strip 201, and are fixed by the first bolt 107. The length of the support rod 1 can be adjusted, and the adjustment method is simple. The support rod 1 can be installed and fixed at different inclination angles between the toothed member clamping plates 2, which is more flexible. The toothed member clamping plates 2 and the prefabricated metal member 3 make the process of combining the retaining structure more convenient, the combination process more labor-saving, the combination method simpler, the wall more neat and straight after combination, the combination structure more firm, and the prefabricated metal members 3 do not need to be connected piece by piece through the mortise and tenon structure.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A prefabricated foundation pit containment system, characterized in that: It comprises a support rod (1), both ends of which are movably connected with sawtooth component clamping plates (2), and a prefabricated metal component (3) is clamped inside the sawtooth component clamping plates (2).

2. A prefabricated foundation pit containment system according to claim 1, characterized in that: The support rod (1) comprises a first movable block (101), a first metal pipe (102), a second metal pipe (103), a third metal pipe (104), a fourth metal pipe (105), a second movable block (106), a first bolt (107), a second bolt (108), a third bolt (109) and a fourth bolt (110).

3. A prefabricated foundation pit containment system according to claim 2, characterized in that: The No. 1 metal tube (102) is fixedly mounted on the rear surface of the No. 1 movable block (101), the No. 2 metal tube (103) is sleeved on the rear end of the No. 1 metal tube (102), the No. 3 metal tube (104) is inserted into the rear end of the No. 2 metal tube (103), the No. 4 metal tube (105) is sleeved on the rear end of the No. 3 metal tube (104), and the No. 2 movable block (106) is fixedly mounted on the rear end of the No. 4 metal tube (105).

4. A prefabricated foundation pit containment system according to claim 3, characterized in that: The No. 1 bolt (107) is arranged inside the No. 1 movable block (101) and the No. 2 movable block (106), the No. 2 bolt (108) is arranged in the through hole at the front end of the No. 2 metal tube (103), the No. 3 bolt (109) is arranged in the through hole at the rear end of the No. 2 metal tube (103), the No. 4 bolt (110) is arranged in the through hole at the front end of the No. 4 metal tube (105), and the No. 1 metal tube (102), the No. 2 metal tube (103), the No. 3 metal tube (104) and the No. 4 metal tube (105) are all provided with through holes on their upper and lower surfaces. The number of through holes opened on the upper and lower surfaces of the No. 1 metal tube (103), the No. 3 metal tube (104) and the No. 4 metal tube (105) is several, and the through holes on the upper and lower surfaces of the No. 1 metal tube (102), the No. 2 metal tube (103), the No. 3 metal tube (104) and the No. 4 metal tube (105) are evenly distributed. The lower end of the No. 2 bolt (108) passes through the through hole at the rear end of the No. 1 metal tube (102), the lower end of the No. 3 bolt (109) passes through the through hole at the front end of the No. 3 metal tube (104), and the lower end of the No. 4 bolt (110) passes through the through hole at the rear end of the No. 3 metal tube (104).

5. The prefabricated foundation pit containment system according to claim 4, characterized in that: The sawtooth component clamping plate (2) comprises a C-shaped metal strip (201), a first clamping tooth plate (202), a metal bottom plate (203), a limiting bolt (204), a limiting strip (205) and a second clamping tooth plate (206).

6. The prefabricated foundation pit containment system according to claim 5, characterized in that: The first latch plate (202) is fixedly installed on the front surface of the C-shaped metal strip (201) at an edge position, and the number of the first latch plates (202) installed is several, and the first latch plates (202) are evenly distributed on the front surface of the C-shaped metal strip (201) at an edge position, and the upper and lower surfaces of the C-shaped metal strip (201) are provided with through holes, and the number of through holes provided on the upper and lower surfaces of the C-shaped metal strip (201) is several, and the through holes provided on the upper and lower surfaces of the C-shaped metal strip (201) are evenly distributed, and the front ends of the second movable block (106) and the first bolt (107) are inserted into the interior of the C-shaped metal strip (201), and the two ends of the first bolt (107) are inserted into the through holes on the upper and lower surfaces of the C-shaped metal strip (201).

7. The prefabricated foundation pit containment system according to claim 6, characterized in that: The limiting bolt (204) is fixedly installed on the rear surface of the metal base plate (203), the limiting strip (205) is fixedly installed on the front surface of the metal base plate (203), the second latch plate (206) is fixedly installed on the rear surface of the metal base plate (203) at an edge position, there are several number of the second latch plates (206) installed, the second latch plates (206) are evenly distributed on the rear surface of the metal base plate (203) at an edge position, there are three limiting strips (205) installed on the front surface of the metal base plate (203), the limiting strips (205) are evenly distributed on the front surface of the metal base plate (203), the front end of the limiting bolt (204) passes through the through hole of the C-shaped metal strip (201) and the front surface of the prefabricated metal component (3), and the prefabricated metal component (3) is located between the first latch plate (202) and the second latch plate (206).

8. A prefabricated foundation pit containment system and a construction method thereof according to claims 1-7, characterized in that: The following steps are involved: S1, the limit strip (205) is inserted into the soil of the inner wall of the foundation pit, the metal bottom plate (203) is attached to the inner wall of the foundation pit, and when the prefabricated metal components (3) are placed, one is placed positive and the other is placed negatively on the outer side of the second clamping plate (206), and the sides of the prefabricated metal components (3) are pressed together; S2, unscrewing the nut at the front end of the limiting bolt (204), inserting the No. 1 clamping tooth plate (202) into the interior of the prefabricated metal component (3), inserting the front end of the limiting bolt (204) into the through hole on the front surface of the C-shaped metal strip (201), then putting the nut on the front end of the limiting bolt (204) and tightening it, the prefabricated metal component (3) is clamped between the C-shaped metal strip (201) and the metal bottom plate (203), the No. 1 clamping tooth plate (202) and the No. 2 clamping tooth plate (206) are responsible for supporting the interior of the prefabricated metal component (3), and the lower end of the prefabricated metal component (3) is against the bottom of the foundation pit; S3, according to the required length of the support rod (1), disassemble and assemble the second bolt (108), the third bolt (109) and the fourth bolt (110), adjust the positions of the second bolt (108), the third bolt (109) and the fourth bolt (110), reassemble the first metal tube (102), the second metal tube (103), the third metal tube (104) and the fourth metal tube (105), and increase or decrease the number of the second metal tube (103) and the third metal tube (104). After the adjustment is completed, tighten the nuts of the second bolt (108), the third bolt (109) and the fourth bolt (110); S4, the front ends of the second movable block (106) and the first movable block (101) are inserted into corresponding positions in the C-shaped metal strip (201), and the through holes of the first movable block (101) and the second movable block (106) are aligned with the through holes at corresponding positions in the C-shaped metal strip (201), and fixed by the first bolt (107).

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