Foundation pit supporting structure and construction method

Abstract

The invention relates to a foundation pit supporting structure and a construction method, and belongs to the field of foundation pit supporting, the foundation pit supporting structure comprises a steel support, a fence assembly is installed on the steel support, a pile body is arranged below the fence assembly, a butt joint assembly is installed on the fence assembly, and a supporting assembly is connected to the butt joint assembly; a pressing assembly is installed between the supporting assembly and the fence assembly, a second ball shaft is rotatably installed in the middle of the fence assembly, an anchor rod is installed in the second ball shaft, a through hole is formed in the anchor rod, a third ball shaft is installed on the anchor rod, a first outer lining and a second outer lining are arranged on the outer side of the third ball shaft, and a first outer lining is installed on the outer side of the first outer lining. An inner cylinder is installed in the anchor rod, a rotating ring is rotatably installed on the outer side of the anchor rod, and a first electric push rod is fixedly connected to the rotating ring. The foundation pit supporting structure solves the problem that an existing foundation pit supporting structure cannot adjust the position of the anchoring section of the anchor rod and the mounting angle of the anchor rod according to the position of the soil slippage section.

Description

Technical Field

[0001] The invention relates to a foundation pit supporting structure and a construction method, belonging to the field of foundation pit supporting. Background Art

[0002] In construction projects, excavation and support of foundation pits for auxiliary structures are common construction links. In the prior art, a variety of support structures are usually used to ensure the stability of the foundation pit, such as the combined support structure of jet grouting piles and interlocking piles. These technologies have improved the safety of foundation pit construction to a certain extent.

[0003] The existing foundation pit support structure still has some defects. For example, the foundation pit support structure disclosed in publication number CN107794931B includes a support plate with a cavity, the upper side of the support plate is connected to a vacuum pump, and the side of the support plate is provided with a support pipe inserted into the soil, the support pipe is connected to the cavity and the pipe wall of the support pipe is provided with a water absorption hole. The support plate is used to support the side wall of the foundation pit, and the support structure is strengthened by the support pipe. After the support pipe is inserted into the soil, the vacuum pump is used to evacuate the air so that the water in the soil flows into the support pipe under negative pressure, and the water in the support pipe enters the cavity of the support plate, reducing the pressure of the soil on the support plate, so that the side wall of the foundation pit is not easy to collapse. Although the above device can reduce the soil pressure, it does not have an anti-slip function, and the existing technology still has problems such as great construction difficulty and unstable support effect when facing complex geological conditions and compact construction space. In particular, when excavating the foundation pit of the auxiliary structure near the completed main building, a more sophisticated and efficient support and construction method is required. The existing foundation pit support structure cannot adjust the anchoring section position of the anchor rod and the installation angle of the anchor rod according to the position of the soil sliding section, nor can it remove the enclosure structure and cut the anchor rod and the anchoring section of the anchor rod for next use after the foundation pit construction.

[0004] Therefore, we made improvements to this and proposed a foundation pit support structure and construction method. Summary of the invention

[0005] (I) The technical problem to be solved by the present invention is that the existing foundation pit support structure cannot adjust the anchoring section position of the anchor rod and the installation angle of the anchor rod according to the position of the soil sliding section.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned invention object, the present invention provides a foundation pit support structure, including a steel support, a fence assembly is installed on the steel support, bored piles are arranged on the outside of the fence assembly, high-pressure rotary jet piles are arranged on the outside of the bored piles, a pile body is arranged below the fence assembly, a docking assembly is installed on the fence assembly, a support assembly is connected to the docking assembly, a clamping assembly is installed between the support assembly and the fence assembly, a second ball shaft is rotatably installed in the middle of the fence assembly, an anchor rod is installed in the second ball shaft, a through hole is opened on the anchor rod, and a third ball shaft is installed on the anchor rod Axle, a first outer bushing and a second outer bushing are arranged on the outside of the third ball shaft, an inner cylinder is installed in the anchor rod, a swivel is rotatably installed on the outside of the anchor rod, a first electric push rod is fixedly connected to the swivel, a cutting assembly is installed on the rear side of the inner cylinder, a fixing rod is fixedly connected to the inner cylinder, a connecting block is fixedly connected to the front end of the first electric push rod and the fixing rod, a connecting ring is installed between the connecting block and the supporting assembly, a connecting frame is installed below the first outer bushing and the second outer bushing, a lap rod is installed on the enclosure assembly, and a sliding connection is formed between the connecting frame and the lap rod, and an adjusting assembly is installed on the pile body.

[0008] Wherein, the enclosure assembly includes a first enclosure plate, and the right side surface of the first enclosure plate is slidably installed with a second enclosure plate, a third enclosure plate, a fourth enclosure plate and a fifth enclosure plate in sequence from left to right.

[0009] Among them, the left sides of the first enclosure plate, the second enclosure plate, the third enclosure plate, the fourth enclosure plate and the fifth enclosure plate are fixedly connected with guide rails, and the right sides of the first enclosure plate, the second enclosure plate, the third enclosure plate, the fourth enclosure plate and the fifth enclosure plate are provided with installation grooves for docking with the guide rails.

[0010] The pile body is fixedly connected with a protrusion, the outer wall of the protrusion fits with the inner wall of the mounting groove, the upper surface of the protrusion is flush with the upper surface of the pile body, and a second opening is provided in the middle of the pile body for the connection frame to move up and down.

[0011] Among them, the docking assembly includes docking grooves opened on the first enclosure plate, the second enclosure plate, the third enclosure plate, the fourth enclosure plate and the fifth enclosure plate, and docking blocks and connecting plates are installed in the docking grooves. The docking blocks and the connecting plates are fixedly connected, and the docking blocks are evenly spaced on the connecting plates.

[0012] Among them, the supporting assembly includes a first folding plate fixedly connected to the docking block in the middle position of the connecting plate, a first ball shaft is rotatably installed in the first folding plate, a connecting rod is slidably installed in the first ball shaft, a retaining ring is fixedly connected to the front side of the connecting rod, and a retaining block is fixedly connected to the rear side of the connecting rod, and the connecting ring and the connecting rod are slidably connected.

[0013] Among them, the clamping assembly includes a fixed cylinder fixedly connected to the third enclosure plate, a convex plate fixedly connected to the fixed cylinder, a first spring fixedly connected to the convex plate, a slide plate connected to the first spring, a sliding rod slidably installed in the fixed cylinder, a fixed connection between the sliding rod and the slide plate, a sliding connection between the slide plate and the fixed cylinder, and a fixed connection between the sliding rod and the first folding plate.

[0014] Among them, the adjustment component includes a second electric push rod installed on the pile body, a connecting block is fixedly connected to the bottom of the second electric push rod, guide rods are arranged through the connecting block and the pile body, a second spring is installed between the guide rod and the pile body, a top block is connected to the second electric push rod, a sliding frame is installed on the outer side of the top block, and the sliding frame is fixedly connected to the connecting frame.

[0015] Wherein, the cutting assembly includes a connecting tube fixedly connected to the front side of the inner tube, the connecting tube is provided with a first opening, the rear side of the connecting tube is fixedly connected to a second folding plate, and both sides of the second folding plate are serrated.

[0016] A construction method for a foundation pit support structure comprises the following steps:

[0017] S1: Level the site, construct bored piles and high-pressure jet grouting piles, and drain the pit at the same time; excavate to the bottom of the first steel support, construct the crown beam, retaining wall and the first steel support; construct the remaining supports in sequence, excavate to the bottom of the pit, and construct the cushion layer and waterproof layer in time; construct the structural bottom plate and side wall in layers, and remove the supports in sequence after the concrete strength reaches the design value; construct the top plate, backfill the earth after the concrete strength reaches the standard, and remove the first steel support

[0018] S2: Install the enclosure assembly on top of the pile body, then install the anchor rod into the inside of the second ball shaft at each location, connect the scattered enclosure assemblies into a whole through the docking assembly, and the support assembly and the clamping assembly ensure that the position of the docking assembly will not change at will;

[0019] S3: Changing the heights of the first outer bushing and the second outer bushing by extending or shortening the adjustment assembly, so that the angle of the anchor rod in the second ball shaft changes, and the angle of the third ball shaft in the first outer bushing also changes, thereby changing the inclination angle of the anchor rod and the cutting assembly;

[0020] S4: After the angle adjustment of the anchor rod is completed, concrete is injected into the inner tube. The concrete will seep out through the through hole, so that after the anchor rod extends into the soil layer, the rear half of the anchor rod will extend radially out of the concrete column. After the concrete dries, it can play an anchoring role, completing the anchoring work of the enclosure assembly;

[0021] S5: After the foundation pit construction is completed, the first electric push rod can be extended to drive the inner cylinder, the fixed rod and the connecting block to move forward, and the cutting assembly will be driven forward by the inner cylinder. The swivel ring can be turned to rotate the inner cylinder so that the cutting assembly can be against the concrete column extending outward. The first electric push rod can be reciprocated and extended. After cutting off the concrete, the first electric push rod is continuously extended. The first electric push rod will act on the supporting assembly so that the clamping assembly no longer clamps the docking assembly. At this time, the enclosure assembly can be disassembled so that the enclosure assembly is gradually removed from the top of the pile body.

[0022] (III) Beneficial effects

[0023] The foundation pit support structure and construction method provided by the present invention have the following beneficial effects:

[0024] 1. Through the installation of steel support and enclosure components, the foundation pit support structure is used to excavate and support the foundation pit of the auxiliary structure around the completed main building, which is particularly suitable for construction environments with limited space and complex geological conditions.

[0025] 2. Through the combination of refined construction steps and efficient support structures, the excavation and support of the auxiliary structure foundation pit around the completed main building was realized. The foundation pit support structure adopts a support structure combining bored cast-in-place piles and steel supports, which improves the stability and adaptability of the support, improves construction efficiency, reduces construction risks, and ensures the stability of the support structure.

[0026] 3. The support structure is provided with a second ball shaft, a third ball shaft and an adjustment assembly. The position of the first outer bushing and the second outer bushing can be adjusted by adjusting the position of the outer bushing. At the same time, since the enclosure assembly remains stationary after installation, the anchor rod will rotate on the third enclosure plate through the second ball shaft, thereby changing the anchoring angle of the anchoring section of the rear half of the anchor rod to adapt to the construction of sliding sections of different soil layers. The anchor rod in the second ball shaft and the third ball shaft can also be slid to change the initial position of the anchoring section of the anchor rod, thereby changing the position of the anchoring section of the anchor rod, so that the device can realize the anti-slip function according to the soil conditions around the foundation pit, thereby enhancing the safety of the support structure and solving the problem that the existing foundation pit support structure cannot adjust the anchoring section position of the anchor rod and the installation angle of the anchor rod according to the position of the soil sliding section.

[0027] 4. Through the provision of a rotatable swivel and a first electric push rod, after concrete is injected into the inner tube, the concrete will seep out from the through hole on the anchor rod, thereby realizing the anchoring function. Subsequently, the inner tube and the cutting assembly can be moved forward by extending the first electric push rod until the position of the second folding plate on the cutting assembly corresponds to the position of the concrete column seeping out of the anchor rod. At this time, the swivel and the first electric push rod can be rotated to make the serrated edge of the second folding plate abut against the concrete column seeping out of the anchor rod. At this time, the first electric push rod can be reciprocated to realize the function of separating the anchor rod from the anchoring section, so that the support structure can be removed after the foundation pit construction is completed, which solves the problem that the existing foundation pit support structure cannot remove the enclosure structure after the foundation pit construction and cut the anchor rod and the anchoring section of the anchor rod for next use.

[0028] 5. By setting up a detachable enclosure assembly and a docking assembly, by further extending the first electric push rod, the block on the support assembly pulls the first folding plate, and the first folding plate no longer resists the sliding rod in the fixed cylinder, so that the docking block and the connecting plate are removed from the docking groove, thereby removing the enclosure plates on the enclosure assembly one by one, thereby improving the convenience of using the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0031] Figure 2 for Figure 1 A magnified schematic diagram of the structure at center A;

[0032] Figure 3 for Figure 1 A magnified schematic diagram of the structure at B in the middle;

[0033] Figure 4 for Figure 1 A magnified schematic diagram of the structure at C in the middle;

[0034] Figure 5 It is a schematic diagram of the connection structure between the fourth enclosure plate and the fifth enclosure plate of the present invention;

[0035] Figure 6 for Figure 5 A magnified schematic diagram of the structure at D in the middle;

[0036] Figure 7 for Figure 5A magnified schematic diagram of the structure at E in the middle;

[0037] Figure 8 It is a schematic diagram of the connection structure between the second enclosure plate and the third enclosure plate of the present invention;

[0038] Fig. 9 for Figure 8 A magnified schematic diagram of the structure at F in the middle;

[0039] Fig.10 It is a schematic diagram of the connection structure between the third baffle plate and the second ball shaft of the present invention;

[0040] Fig.11 for Fig.10 A magnified schematic diagram of the structure at G in the middle;

[0041] Fig.12 for Fig.10 A magnified schematic diagram of the structure at H in the middle;

[0042] Fig.13 It is a schematic diagram of the connection structure between the enclosure assembly and the steel support of the present invention;

[0043] Fig.14 It is a schematic diagram of the steel support structure of the present invention.

[0044] 1. Steel support; 2. Enclosure assembly; 201. First enclosure plate; 202. Second enclosure plate; 203. Third enclosure plate; 204. Fourth enclosure plate; 205. Fifth enclosure plate; 3. Mounting groove; 4. Guide rail; 5. Pile body; 6. Docking assembly; 601. Docking block; 602. Docking groove; 603. Connecting plate; 7. Support assembly; 701. First folding plate; 702. First ball shaft; 703. Connecting rod; 704. Retaining ring; 705. Block; 8. Pressing assembly; 801. Fixing cylinder; 802. Protruding plate; 803. First spring; 804. Slide plate; 805. Slide rod; 9. Second ball shaft; 10. Anchor rod; 11. The first outer bushing; 12, the second outer bushing; 13, the third ball shaft; 14, the swivel; 15, the first electric push rod; 16, the inner tube; 17, the fixing rod; 18, the connecting block; 19, the connecting ring; 20, the protrusion; 21, the connecting frame; 22, the overlapping rod; 23, the adjusting assembly; 2301, the second electric push rod; 2302, the top block; 2303, the sliding frame; 2304, the connecting block; 2305, the guide rod; 2306, the second spring; 24, the cutting assembly; 2401, the connecting pipe; 2402, the first opening; 2403, the second folding plate; 25, the through hole; 26, the second opening; 27, the bored pile; 28, the high-pressure rotary jet pile. DETAILED DESCRIPTION

[0045] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples of the specification. The following examples are only used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0046] Embodiment 1:

[0047] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 and Fig.14As shown, this embodiment proposes a foundation pit support structure, including a steel support 1, a fence assembly 2 is installed on the steel support 1, a bored pile 27 is arranged outside the fence assembly 2, and a high-pressure jet grouting pile 28 is arranged outside the bored pile 27. The support structure combining the bored pile 27 with the steel support 1 ensures the stability of the support structure. A pile body 5 is arranged below the enclosure assembly 2, and the pile body 5 ensures that the bottom of the enclosure assembly 2 remains straight. A docking assembly 6 is installed on the enclosure assembly 2, and a support assembly 7 is connected to the docking assembly 6. A clamping assembly 8 is installed between the support assembly 7 and the enclosure assembly 2, and the clamping assembly 8 enables the support assembly 7 to stably dock the docking assembly 6 with the enclosure assembly 2, and the enclosure assembly 2 remains in a docked state. A second ball shaft 9 is installed in the middle rotation of the enclosure assembly 2, and an anchor rod 10 is installed in the second ball shaft 9. A through hole 25 is opened on the anchor rod 10, and the anchor rod 10 can be rotated on the enclosure assembly 2 through the second ball shaft 9, so as to change the anchoring angle, and a third ball shaft 13 is installed on the anchor rod 10, and a first outer bushing 11 and a second outer bushing 12 are arranged on the outer side of the third ball shaft 13, and the third ball shaft 13 can stably rotate in the first outer bushing 11 and the second outer bushing 12. An inner cylinder 16 is installed in the anchor rod 10, and a swivel 14 is rotatably installed on the outer side of the anchor rod 10. A first electric push rod 15 is fixedly connected to the swivel 14. A cutting assembly 24 is installed on the rear side of the inner cylinder 16. A fixing rod 17 is fixedly connected to the inner cylinder 16. A connecting block 18 is fixedly connected to the front ends of the first electric push rod 15 and the fixing rod 17. A connecting ring 19 is installed between the connecting block 18 and the supporting assembly 7. A connecting frame 21 is installed below the first outer bushing 11 and the second outer bushing 12. The first outer bushing 11 and the second outer bushing 12 are fixed by bolts. The first outer bushing 11 and the second outer bushing 12 are fixed to the connecting frame 21 by bolts. A lap rod 22 is installed on the enclosure assembly 2. The connecting frame 21 and the lap rod 22 are slidably connected. An adjusting assembly is installed on the pile body 5. 23. The adjusting component 23 can make the connecting frame 21 slide on the lap rod 22. Since the enclosure component 2 remains stationary, the device can change the angle of the anchor rod 10 by pushing the third ball shaft 13 upward, so as to adjust the anchoring angle later. By injecting concrete into the inner tube 16, the concrete seeps out from the through hole 25 on the anchor rod 10. At this time, the first electric push rod 15 is extended. When the concrete infiltrated into the soil layer is dry, the first electric push rod 15 can be reciprocated and retracted, and the inner tube 16 is rotated so that the cutting component 24 can cut off the concrete column infiltrated into the soil layer. The first electric push rod 15 can be further extended so that the supporting component 7 pulls the docking component 6 and the clamping component 8. The docking component 6 no longer connects the enclosure component 2 as a whole, so that the enclosure component 2 can be conveniently disassembled after the foundation pit construction is completed.

[0048] Embodiment 2:

[0049] The solution in Example 1 is further introduced below in combination with a specific working method, as described below:

[0050] like Figure 1 and Figure 4 As shown, as a preferred embodiment, on the basis of the above-mentioned method, further, the enclosure assembly 2 includes a first enclosure plate 201, and the right side surface of the first enclosure plate 201 is slidably installed with a second enclosure plate 202, a third enclosure plate 203, a fourth enclosure plate 204 and a fifth enclosure plate 205 from left to right in sequence. The five enclosure plates make the enclosure assembly 2 easier to install and disassemble, and enhance the convenience of the device during disassembly and transportation.

[0051] like Figure 1 , Figure 4 and Figure 5 As shown, as a preferred embodiment, on the basis of the above-mentioned method, further, the left sides of the first enclosure plate 201, the second enclosure plate 202, the third enclosure plate 203, the fourth enclosure plate 204 and the fifth enclosure plate 205 are fixedly connected with the guide rail 4, and the right sides of the first enclosure plate 201, the second enclosure plate 202, the third enclosure plate 203, the fourth enclosure plate 204 and the fifth enclosure plate 205 are provided with an installation groove 3 for docking with the guide rail 4, and the guide rail 4 and the installation groove 3 enable the adjacent enclosure plates to be slidably assembled and disassembled, so that the supporting structure can be removed one by one later.

[0052] like Figure 1 and Figure 4 As shown, as a preferred embodiment, on the basis of the above-mentioned method, further, a protrusion 20 is fixedly connected to the pile body 5, and the outer wall of the protrusion 20 fits with the inner wall of the mounting groove 3 to ensure that the supporting structure is stably installed on the pile body 5. The upper surface of the protrusion 20 is flush with the upper surface of the pile body 5, and a second opening 26 for the connection frame 21 to move up and down is opened in the middle of the pile body 5. The second opening 26 ensures that the connection frame 21 is not blocked when moving downward.

[0053] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, as a preferred embodiment, on the basis of the above method, further, the docking assembly 6 includes a docking groove 602 opened on the first enclosure plate 201, the second enclosure plate 202, the third enclosure plate 203, the fourth enclosure plate 204 and the fifth enclosure plate 205, and a docking block 601 and a connecting plate 603 are installed in the docking groove 602. The docking block 601 and the connecting plate 603 are fixedly connected, and the docking blocks 601 are evenly spaced on the connecting plate 603. By embedding the docking blocks 601 and the connecting plates 603 into the docking grooves 602 on each enclosure plate, there is no up and down deviation between the two adjacent enclosure plates, thereby ensuring the overall stability of the support structure and facilitating the subsequent removal of the enclosure plates one by one.

[0054] As shown in 2, as a preferred embodiment, on the basis of the above method, further, the support assembly 7 includes a first folding plate 701 fixedly connected to the docking block 601 at the middle position of the connecting plate 603, a first ball shaft 702 is rotatably installed in the first folding plate 701, a connecting rod 703 is slidably installed in the first ball shaft 702, a retaining ring 704 is fixedly connected to the front side of the connecting rod 703, a retaining block 705 is fixedly connected to the rear side of the connecting rod 703, and the connecting ring 19 and the connecting rod 703 are slidably connected. After the connecting rod 703 moves forward to a certain extent, the retaining block 705 will pull the first folding plate 701 forward, so as to pull the connecting plate 603 and the docking block 601 subsequently, so as to facilitate the subsequent removal of the support structure.

[0055] like Figure 2 As shown, as a preferred embodiment, on the basis of the above-mentioned method, further, the clamping assembly 8 includes a fixed cylinder 801 fixedly connected to the third enclosure plate 203, the fixed cylinder 801 is fixedly connected with a convex plate 802, the convex plate 802 is fixedly connected with a first spring 803, the first spring 803 is connected with a slide plate 804, a slide rod 805 is slidably installed in the fixed cylinder 801, the slide rod 805 and the slide plate 804 are fixedly connected, the slide plate 804 and the fixed cylinder 801 are slidably connected, the slide rod 805 and the first folding plate 701 are fixedly connected, and the first spring 803 enables the slide plate 804 to drive the slide rod 805 to slide into the fixed cylinder 801, so that the support structure maintains a stable installation state.

[0056] like Figure 5 , Figure 6 and Figure 7 As shown, as a preferred embodiment, on the basis of the above-mentioned method, further, the adjustment component 23 includes a second electric push rod 2301 installed on the pile body 5, a connecting block 2304 is fixedly connected to the bottom of the second electric push rod 2301, a guide rod 2305 is penetrated through the connecting block 2304 and the pile body 5, a second spring 2306 is installed between the guide rod 2305 and the pile body 5, a top block 2302 is connected to the second electric push rod 2301, a sliding frame 2303 is installed on the outer side of the top block 2302, the sliding frame 2303 and the connecting frame 21 are fixedly connected, by extending the second electric push rod 2301, the connecting frame 21 is pushed obliquely upward, and the sliding frame 2303 will slide on the top block 2302 to adjust the angle of the anchoring section of the support structure. When dismantling the supporting structure, the guide rod 2305 is pulled to disengage the guide rod 2305 from the connecting block 2304 , and the second spring 2306 is stretched to remove the second electric push rod 2301 and the third enclosure plate 203 from the pile body 5 .

[0057] like Figure 8 , Fig. 9 , Fig.10 , Fig.11and Fig.12 As shown, as a preferred embodiment, on the basis of the above method, further, the cutting assembly 24 includes a connecting pipe 2401 fixedly connected to the front side of the inner tube 16, a first opening 2402 is opened on the connecting pipe 2401, and a second folding plate 2403 is fixedly connected to the rear side of the connecting pipe 2401, and both sides of the second folding plate 2403 are serrated. Through intermittent extension and shortening, the second folding plate 2403 can cut off the seeping and dried concrete column, so that the anchoring section can be cut first when the supporting structure is dismantled.

[0058] Embodiment 3:

[0059] The schemes in Example 1 and Example 2 are further introduced below in combination with specific working methods, as described below for details:

[0060] Specifically, when the foundation pit support structure and construction method are used: Fig.13 and Fig.14 As shown, the site is leveled, bored piles 27 and high-pressure rotary jet piles 28 are constructed, the pit is drained at the same time, the excavation is carried out to the bottom of the first steel support 1, the crown beam, retaining wall and the first steel support 1 are constructed, the remaining supports are constructed in sequence, the excavation is carried out to the bottom of the pit, the cushion layer and the waterproof layer are constructed in time, the structural bottom plate and side walls are constructed in layers, and after the concrete strength reaches the design value, the supports are removed in sequence, the top plate is constructed, the earth is backfilled after the concrete strength reaches the standard, and the first steel support is removed.

[0061] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 and Fig.12 As shown, the enclosure assembly 2 is installed above the pile body 5, and the protrusion 20 is connected to the installation groove 3 on the right side of the first enclosure plate 201, the second enclosure plate 202, the third enclosure plate 203, the fourth enclosure plate 204 and the fifth enclosure plate 205, and the first enclosure plate 201 Figure 1 In the manner described above, the second enclosure plate 202, the third enclosure plate 203, the fourth enclosure plate 204 and the fifth enclosure plate 205 are connected in sequence through the installation groove 3 and the guide rail 4. Then the anchor rod 10 is installed inside the second ball shaft 9 and the third ball shaft 13 at each location, the first outer bushing 11 and the second outer bushing 12 are installed outside the third ball shaft 13, and the front and rear positions of the anchor rod 10 in the second ball shaft 9 and the third ball shaft 13 are adjusted, thereby changing the position of the subsequent anchoring section. The scattered enclosure components 2 are connected into a whole through the docking component 6, such as Figure 2 and Figure 6 As shown, since the docking block 601, the connecting plate 603, the first folding plate 701, the sliding rod 805 and the sliding plate 804 are a whole, under the action of the first spring 803 on the convex plate 802, the docking block 601 and the connecting plate 603 always maintain a docking state with the docking groove 602, thereby fixing the first enclosure plate 201, the second enclosure plate 202, the third enclosure plate 203, the fourth enclosure plate 204 and the fifth enclosure plate 205 as a whole. By extending or shortening the second electric push rod 2301 on the adjustment component 23, the second electric push rod 2301 can change the position of the sliding frame 2303 through the top block 2302 when shortening. When the sliding frame 2303 moves diagonally upward, the sliding frame 2303 will slide on the top block 2302, and the connecting frame 21 will slide on the lap rod 22. Since the third enclosure plate 203 remains stationary, the third ball shaft 13 can be pushed diagonally upward at this time to change the angle of the anchor rod 10, so as to subsequently adjust the angle of the anchoring section of the support structure. By injecting concrete into the inner cylinder 16, the concrete is allowed to seep out from the first opening 2402 of the connecting pipe 2401 and the through hole 25 on the anchor rod 10, and the first electric push rod 15 is reciprocated to ensure that the inner cylinder 16 and the connecting pipe 2401 remain in a slidable state. When the concrete that has penetrated into the soil layer is dry, the inner cylinder 16 is rotated to cut off the concrete column that has penetrated into the soil layer by utilizing the serrated structure on the side of the second folding plate 2403 on the cutting assembly 24. The first electric push rod 15 can be continuously extended to make the connecting ring 19 on the connecting block 18 abut against the retaining ring 704, thereby allowing the connecting rod 703 to move forward.

[0062] like Figure 2 As shown, the connecting rod 703 slides in the first ball shaft 702, and the first ball shaft 702 can be pressed against by the stopper 705, so that the first folding plate 701 pulls the docking block 601 and the connecting plate 603 to move forward until the docking block 601 and the connecting plate 603 are disengaged from the docking groove 602, and the docking assembly 6 no longer connects the enclosure assembly 2 as a whole, so that the enclosure assembly 2 can be easily disassembled through the installation groove 3 and the guide rail 4 after the foundation pit construction is completed. Figure 7 As shown, by pulling the guide rod 2305, the second spring 2306 is stretched until the guide rod 2305 is disengaged from the connecting block 2304. At this time, the second electric push rod 2301 and the third enclosure plate 203 can be removed from the pile body 5, so that the enclosure plates at various positions can be removed in batches after the foundation pit construction is completed.

[0063] The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A foundation pit support structure, comprising a steel support (1), characterized in that: The steel support (1) is provided with a baffle assembly (2), the outer side of the baffle assembly (2) is provided with a bored pile (27), the outer side of the bored pile (27) is provided with a high-pressure jet grouting pile (28), a pile body (5) is provided below the baffle assembly (2), a docking assembly (6) is provided on the baffle assembly (2), a support assembly (7) is connected to the docking assembly (6), a clamping assembly (8) is provided between the support assembly (7) and the baffle assembly (2), a second ball shaft (9) is rotatably provided in the middle of the baffle assembly (2), an anchor rod (10) is provided in the second ball shaft (9), a through hole (25) is provided on the anchor rod (10), a third ball shaft (13) is provided on the anchor rod (10), a first outer bushing (11) and a second outer bushing (13) are provided on the outer side of the third ball shaft (13) The invention relates to a sleeve (12), an inner cylinder (16) is installed in the anchor rod (10), a swivel (14) is rotatably installed on the outer side of the anchor rod (10), a first electric push rod (15) is fixedly connected to the swivel (14), a cutting assembly (24) is installed on the rear side of the inner cylinder (16), a fixing rod (17) is fixedly connected to the inner cylinder (16), a connecting block (18) is fixedly connected to the front ends of the first electric push rod (15) and the fixing rod (17), a connecting ring (19) is installed between the connecting block (18) and the supporting assembly (7), a connecting frame (21) is installed below the first outer sleeve (11) and the second outer sleeve (12), a lap rod (22) is installed on the enclosure assembly (2), and a sliding connection is formed between the connecting frame (21) and the lap rod (22), and an adjusting assembly (23) is installed on the pile body (5).

2. A foundation pit support structure according to claim 1, characterized in that: The enclosure assembly (2) comprises a first enclosure plate (201), and a second enclosure plate (202), a third enclosure plate (203), a fourth enclosure plate (204) and a fifth enclosure plate (205) are slidably mounted on the right side of the first enclosure plate (201) in sequence from left to right.

3. A foundation pit support structure according to claim 2, characterized in that: The left sides of the first enclosure plate (201), the second enclosure plate (202), the third enclosure plate (203), the fourth enclosure plate (204) and the fifth enclosure plate (205) are all fixedly connected to the guide rail (4), and the right sides of the first enclosure plate (201), the second enclosure plate (202), the third enclosure plate (203), the fourth enclosure plate (204) and the fifth enclosure plate (205) are all provided with a mounting groove (3) for docking with the guide rail (4).

4. A foundation pit support structure according to claim 3, characterized in that: A protrusion (20) is fixedly connected to the pile body (5), the outer wall of the protrusion (20) and the inner wall of the mounting groove (3) are in contact with each other, the upper surface of the protrusion (20) is flush with the upper surface of the pile body (5), and a second opening (26) for the connection frame (21) to move up and down is provided in the middle of the pile body (5).

5. A foundation pit support structure according to claim 3, characterized in that: The docking assembly (6) includes a docking groove (602) provided on the first enclosure plate (201), the second enclosure plate (202), the third enclosure plate (203), the fourth enclosure plate (204) and the fifth enclosure plate (205), wherein a docking block (601) and a connecting plate (603) are installed in the docking groove (602), wherein the docking block (601) and the connecting plate (603) are fixedly connected, and the docking blocks (601) are evenly spaced on the connecting plate (603).

6. A foundation pit support structure according to claim 5, characterized in that: The support assembly (7) comprises a first folding plate (701) fixedly connected to a docking block (601) at a middle position of a connecting plate (603); a first ball shaft (702) is rotatably mounted in the first folding plate (701); a connecting rod (703) is slidably mounted in the first ball shaft (702); a retaining ring (704) is fixedly connected to the front side of the connecting rod (703); a retaining block (705) is fixedly connected to the rear side of the connecting rod (703); and a sliding connection is formed between the connecting ring (19) and the connecting rod (703).

7. A foundation pit support structure according to claim 6, characterized in that: The clamping assembly (8) includes a fixed cylinder (801) fixedly connected to the third enclosure plate (203), a convex plate (802) fixedly connected to the fixed cylinder (801), a first spring (803) fixedly connected to the convex plate (802), a slide plate (804) connected to the first spring (803), a sliding rod (805) slidably installed in the fixed cylinder (801), the sliding rod (805) and the slide plate (804) are fixedly connected, the slide plate (804) and the fixed cylinder (801) are slidably connected, and the sliding rod (805) and the first folding plate (701) are fixedly connected.

8. The foundation pit support structure according to claim 1, characterized in that: The adjustment assembly (23) comprises a second electric push rod (2301) mounted on the pile body (5); a connecting block (2304) is fixedly connected to the lower side of the second electric push rod (2301); a guide rod (2305) is provided through the connecting block (2304) and the pile body (5); a second spring (2306) is installed between the guide rod (2305) and the pile body (5); a top block (2302) is connected to the second electric push rod (2301); a sliding frame (2303) is installed on the outer side of the top block (2302); and the sliding frame (2303) is fixedly connected to the connecting frame (21).

9. The foundation pit support structure according to claim 1, characterized in that: The cutting assembly (24) comprises a connecting tube (2401) fixedly connected to the front side of the inner tube (16), the connecting tube (2401) being provided with a first opening (2402), and a second folding plate (2403) being fixedly connected to the rear side of the connecting tube (2401), and both sides of the second folding plate (2403) being serrated.

10. A construction method of a foundation pit support structure, using the foundation pit support structure according to claim 1, characterized in that: The steps include: S1: Level the site, construct bored piles (27) and high-pressure jet grouting piles (28), and drain the pit at the same time; excavate to the bottom of the first steel support (1), construct the crown beam, retaining wall and the first steel support (1); construct the remaining supports in sequence, excavate to the bottom of the pit, and construct the cushion layer and waterproof layer in time; construct the structural bottom plate and side wall in layers, and remove the supports in sequence after the concrete strength reaches the design value; construct the top plate, backfill the earth after the concrete strength reaches the standard, and remove the first steel support; S2: Install the enclosure assembly (2) above the pile body (5), then install the anchor rod (10) into the interior of the second ball shaft (9) at each location, connect the scattered enclosure assemblies (2) into a whole through the docking assembly (6), and the support assembly (7) and the clamping assembly (8) ensure that the position of the docking assembly (6) will not change at will; S3: Changing the height of the first outer bushing (11) and the second outer bushing (12) by extending or shortening the adjustment component (23), so that the angle of the anchor rod (10) in the second ball shaft (9) changes, and at this time, the angle of the third ball shaft (13) in the first outer bushing (11) also changes, thereby changing the inclination angle of the anchor rod (10) and the cutting component (24); S4: After the angle adjustment of the anchor rod (10) is completed, concrete is injected into the inner tube (16), and the concrete will seep out through the through hole (25), so that after the anchor rod (10) extends into the soil layer, the rear half of the anchor rod (10) will extend radially out of the concrete column, and the concrete can play an anchoring role after drying, thereby completing the anchoring work of the enclosure assembly (2); S5: After the foundation pit construction is completed, the first electric push rod (15) can be extended to drive the inner cylinder (16), the fixing rod (17) and the connecting block (18) to move forward, and the cutting assembly (24) can be driven forward by the inner cylinder (16). The rotating ring (14) can be rotated to rotate the inner cylinder (16) so that the cutting assembly (24) is pressed against the concrete column extending outward. The first electric push rod (15) can be reciprocated and extended. After cutting the concrete, the first electric push rod (15) is continuously extended. The first electric push rod (15) acts on the supporting assembly (7) so that the clamping assembly (8) no longer clamps the docking assembly (6). At this time, the enclosure assembly (2) can be disassembled so that the enclosure assembly (2) is gradually removed from the top of the pile body (5).

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