Mini-pile foundation pit supporting device and method

Abstract

The application provides a micro pile foundation pit supporting device and method, and belongs to the technical field of foundation pit supporting, which comprises a pile body, a base plate, a torsion resisting mechanism and an external supporting mechanism. The pile body is provided with multiple parts which are uniformly distributed, and each of the parts is internally provided with a mounting cavity and top thereof is provided with a limiting groove. The base plate is provided with multiple parts which are correspondingly arranged with the positions of the pile body, and each of the parts is provided with an inclined rod between the base plate and the corresponding pile body. The torsion resisting mechanism is provided with multiple groups which are respectively arranged on each limiting groove, and each of the groups comprises a lower supporting ring, an upper supporting ring and a spring. The lower supporting ring and the upper supporting ring are both slidingly connected to the surface of the limiting groove, and the spring is located between the lower supporting ring and the upper supporting ring. The external supporting mechanism is provided with multiple groups which are respectively arranged on each pile body, and the supporting effect is improved by expanding the supporting area. With the linkage of the cross folding rods, the stress is diffused outward, so that the deformation caused by the pressure is reduced. The supporting strength is effectively improved and the supporting effect is strengthened through the elastic effect of the spring.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of foundation pit support, and particularly relates to a micro pile foundation pit support device and method. BACKGROUND

[0002] The foundation pit support is a support, reinforcement and protection measure for the side wall and surrounding environment of the foundation pit to ensure the safety of underground structure construction and the surrounding environment of the foundation pit. Common support forms include pile row support, continuous wall support, cement retaining wall, soil nailing wall and original soil-like slope, and a cast-in-place pile with drilling, strong reinforcement and pressure grouting construction technology is generally used.

[0003] The prior art discloses a patent with the application number CN202010318596.5, which discloses a foundation pit support structure based on multiple micro piles, including a edge protection mechanism, a pit wall support mechanism and a drainage mechanism. The edge protection mechanism includes a base, the upper surface of the base is fixedly connected with a support column, the front surface of the base is fixedly connected with an electric control box, the pit wall support mechanism includes a corbel, and the lower surface of the corbel is fixedly connected with a micro pile. The application also proposes a construction method of the foundation pit support structure based on multiple micro piles, including the following steps: S1, fixing the protection net by using the support column, and providing illumination for personnel at night by using the electric control box and the bulb. The foundation pit support structure based on multiple micro piles can provide illumination at night by setting the electric control box and the bulb, can protect the bulb by setting the lamp box, can prevent water and soil landslide by setting the baffle, and can achieve the effects of safety and stability of the foundation pit support structure based on multiple micro piles by setting the micro pile, the pressure distribution horizontal plate and the pressure distribution vertical plate.

[0004] The existing foundation pit support is mostly reinforced at the foundation pit wall. With the progress of the construction process, the strength and shape of the foundation pit support will change. When the height of the support is high, the end far from the pit bottom will be inclined, especially when the soil around the foundation pit is relatively humid, the degree of inclination will be more serious. The micro pile foundation pit support generally has low stability and safety hazards. Therefore, we propose a micro pile foundation pit support device and method. SUMMARY

[0005] The purpose of the present application is to provide a micro pile foundation pit support device and method, which aims to solve the problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A micro pile foundation pit support device, comprising:

[0008] A pile body is provided with a plurality of and uniformly distributed installation cavities in the inside, and a limiting groove is arranged at the top of each installation cavity.

[0009] The base plate is provided with a plurality of base plates corresponding to the positions of the piles, and a diagonal rod is arranged between each base plate and the corresponding pile.

[0010] The anti-twist mechanism is provided with a plurality of anti-twist mechanisms and is arranged on each limiting groove, and each anti-twist mechanism comprises a lower supporting ring, an upper supporting ring and a spring, the lower supporting ring and the upper supporting ring are both slidingly connected to the surface of the limiting groove, and the spring is located between the lower supporting ring and the upper supporting ring.

[0011] The outer support mechanism is provided with a plurality of outer support mechanisms and is arranged on each pile, and the outer support mechanism expands the supporting area to improve the supporting effect.

[0012] As a preferred scheme of the present application, the outer support mechanism comprises:

[0013] The top cover is fixedly connected to the upper end of the limiting groove, and a threaded hole is arranged at the top of the top cover;

[0014] The screw rod is threadedly connected to the threaded hole, and a rotating handle is fixedly connected to the upper end of the screw rod;

[0015] The double-head sleeve ring is rotatably connected to the lower end of the screw rod;

[0016] The extension rod is fixedly connected to the lower end of the double-head sleeve ring, and a plurality of hinge shafts are fixedly connected to the lower end of the extension rod; and

[0017] The expansion assembly is provided with a plurality of expansion assemblies and is connected to the corresponding hinge shaft.

[0018] As a preferred scheme of the present application, each expansion assembly comprises a triangular rod and a single ear shaft, one end of the triangular rod is rotatably connected to the hinge shaft, a plurality of external embedding grooves are arranged on the circumferential surface of the pile, the triangular rod is embedded in the external embedding groove, the single ear shaft is fixedly connected to the external embedding groove, and the bent part of the triangular rod is rotatably connected to the single ear shaft.

[0019] As a preferred scheme of the present application, a cross-folded rod is arranged between adjacent lower supporting rings and upper supporting rings, and the ends of the cross-folded rod are rotatably connected to the edges of the lower supporting ring and the upper supporting ring.

[0020] As a preferred scheme of the present application, a first ear shaft seat is fixedly connected to each base plate near the pile, a second ear shaft seat is fixedly connected to the top of each upper supporting ring, the two ends of the diagonal rod are rotatably connected between the first ear shaft seat and the second ear shaft seat, and two diagonal rods are arranged between each first ear shaft seat and second ear shaft seat.

[0021] As a preferred scheme of the present application, the inclined portions of the inclined rods are each provided with a protruding block, and a H-shaped connecting piece is arranged between two adjacent inclined rods, the two sides of the H-shaped connecting piece are each provided with a clamping groove, the protruding block is fitted into the clamping groove, and a reinforcing plate is rotatably connected between the two H-shaped connecting pieces, and the inside of the reinforcing plate is fixedly connected with a level.

[0022] As a preferred scheme of the present application, each of the base plates is fixedly connected with two triangular plates near the side of the pile body, the outer side of each of the triangular plates is fixedly connected with a positioning hole, and a short ground spike is detachably connected in each of the positioning holes.

[0023] As a preferred scheme of the present application, the side of each of the triangular plates is provided with a slot, and a baffle is detachably connected in the adjacent slot.

[0024] As a preferred scheme of the present application, the two sides of each of the base plates are provided with stepped grooves, the top of each of the base plates is provided with a base hole, a long ground spike is inserted into each of the base holes from top to bottom, and a steel plate is fixedly connected to the upper end of the adjacent long ground spike.

[0025] As a preferred scheme of the present application, a corner plate is detachably connected to the corner of the base plate, and a reinforcing rib is welded between the inner walls of the corner plate.

[0026] A method for supporting a foundation pit by using micro piles, comprising the following steps:

[0027] S1, sequentially attaching each base plate to the pit wall of the foundation pit, and then driving a short ground spike into the ground to fix the position of the base plate;

[0028] S2, then inserting a long ground spike into the base hole, and driving the end of the long ground spike into the ground to fix the connection between the two adjacent base plates;

[0029] S3, after the position of the base plate is fixed, drilling a hole in the bottom of the foundation pit, and sequentially burying each pile body so that the position of each pile body corresponds to the base plate, then connecting an inclined rod between the upper support ring and the base plate, so that the pile body, the base plate and the inclined rod form a triangular structure to increase the stability;

[0030] S4, installing the lower support ring, the upper support ring and the spring on the surface of the limiting groove, when the base plate is subjected to pressure, the upper support ring transmits the pressure to the spring, and the cross-folding rod is linked to diffuse the stress outwardly to reduce the deformation caused by the pressure;

[0031] S5, rotating the rotating handle to drive the screw rod to rotate, the screw rod drives the extension rod to move downwardly, a plurality of triangular rods are expanded outwardly under the displacement of the hinge shaft, the volume of the triangular rods in the ground is increased, the upward movement of the pile body is blocked, and the supporting effect is improved.

[0032] Compared with the prior art, the present application has the following advantages:

[0033] 1、The pile body, base plate and inclined rod form a triangular structure, the adjacent base plates are connected in a splicing manner, both sides of the base plate are provided with stepped grooves, the connection strength can be increased, the gap between the adjacent base plates can be reduced, after the pile body is inserted into the ground, the triangular rods are also located in the ground, the rotating handle is located on the upper side of the top cover, the rotating handle drives the screw rod to rotate, the screw rod pushes the extension rod to move downward, then the plurality of triangular rods expand outward, so that the volume of the triangular rods in the ground is increased, the area of the planar structure is expanded, the triangular rods block the upward movement of the pile body, the stability and support effect of the pile body are enhanced, the limiting grooves are used for limiting the linear movement and movement distance of the lower support ring and the upper support ring, the spring is sleeved on the circumferential surface of the limiting groove, the cross folding rods are arranged between the adjacent pile bodies, the cross folding rods have a telescopic structure, when the base plate is subjected to pressure, the upper support ring transmits the pressure to the spring, the stress is diffused outward through the linkage of the cross folding rods, so that the deformation caused by the pressure is reduced, and the support strength is effectively improved through the elastic effect of the spring, and the supporting effect is enhanced.

[0034] 2、In the scheme, the strong matching plate is connected between the two I-shaped connectors, both ends of the strong matching plate can rotate, if the positions of the base plate and the pile body are not accurately installed, the strong matching plate will be inclined, the inclination angle can be directly observed through the level, and the inclination angle can be observed through the level, so that whether the support angle of the base plate is inclined can be more directly monitored, and whether the structure is deformed can be detected.

[0035] 3、In the scheme, there is a certain distance between the two adjacent triangular plates, after the baffle is inserted into the insertion slot, there is a semi-sealed area between the baffle and the group of triangular plates, sand can be filled in the area, so that the supporting effect of the base plate is further enhanced, and the base plate is prevented from being inclined. DETAILED DESCRIPTION

[0036] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application, and do not limit the application.

[0037] In the drawings:

[0038] Figure 1 is a perspective view of the present application;

[0039] Figure 2 is a side view of the present application;

[0040] Figure 3 is a structure diagram of the pile body of the present application;

[0041] Figure 4 is a sectional view of the pile body of the present application;

[0042] Figure 5 This is an exploded view of the pile body of the present invention;

[0043] Figure 6 This is a structural diagram of the handle of the present invention;

[0044] Figure 7 This is a structural diagram of the external support mechanism of the present invention;

[0045] Figure 8 This is a structural diagram of the substrate of the present invention;

[0046] Figure 9 This is an exploded view of the oblique rod of the present invention;

[0047] Figure 10 This is a structural diagram of the I-shaped connector of the present invention.

[0048] Explanation of the numbers in the figure: 1. Pile body; 101. Installation cavity; 102. External embedded groove; 2. Base plate; 201. Base hole; 202. Step groove; 3. Inclined rod; 4. Limiting groove; 5. Lower support ring; 6. Upper support ring; 7. Spring; 8. Top cover; 9. Screw hole; 10. Screw; 11. Turning handle; 12. Double-headed ring; 13. Extension rod; 14. Triangular rod; 15. Hinge shaft; 16. Single ear shaft; 17. Cross-folding rod; 18. Long ground spike; 19. Steel plate; 20. First ear shaft seat; 21. Second ear shaft seat; 22. Raised block; 24. I-shaped connector; 2401. Slot; 25. Strong matching plate; 26. Level; 27. Triangular plate; 28. Short ground spike; 29. ​​Positioning hole; 30. Slot; 31. Baffle; 32. Angle plate; 33. Reinforcement rib. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention. Example

[0050] See also Figures 1-10 , the technical solutions provided in this embodiment are as follows:

[0051] The utility model provides a kind of micro pile foundation pit supporting device, including pile body 1, base plate 2, torsion mechanism and outer support mechanism, pile body 1 is provided with multiple and evenly distributed, its inside is provided with installation cavity 101, its top is provided with limiting groove 4;Base plate 2 is provided with multiple and with the position corresponding with pile body 1, between it and corresponding pile body 1 are provided with inclined bar 3;Torsion mechanism is provided with multiple groups and is respectively arranged on each limiting groove 4, it includes lower support ring 5, upper support ring 6 and spring 7, lower support ring 5 and upper support ring 6 are slidably connected to the surface of limiting groove 4, spring 7 is between lower support ring 5 and upper support ring 6;Outer support mechanism is provided with multiple groups and is respectively arranged on each pile body 1, it is by enlarging support area to improve supporting effect.

[0052] In the specific embodiment of the application, the pile body 1 is driven into the ground, the base plate 2 is used to support the pit wall, the pile body 1, the base plate 2 and the inclined bar 3 form a triangular structure, the adjacent base plates 2 are connected by splicing, and the two sides of the base plate 2 are provided with stepped grooves 202, which can increase the connection strength and reduce the gap between the adjacent base plates 2. After the pile body 1 is inserted into the ground, the triangular bars 14 are also located in the ground, the rotating handle 11 is located on the upper side of the top cover 8, the rotating handle 11 is rotated to drive the screw rod 10 to rotate, the screw rod 10 pushes the extension rod 13 to move downward, and then the multiple triangular bars 14 are expanded outward to increase the volume of the triangular bars 14 in the ground and expand the area of the planar structure. The triangular bars 14 block the upward movement of the pile body 1 to strengthen the stability and supporting effect of the pile body 1. The limiting groove 4 is used to limit the linear movement and movement distance of the lower support ring 5 and the upper support ring 6. The spring 7 is sleeved on the circumferential surface of the limiting groove 4. The adjacent pile bodies 1 are provided with cross folding rods 17. The cross folding rods 17 have a telescopic structure. When the base plate 2 is subjected to pressure, the upper support ring 6 transmits the pressure to the spring 7. The cross folding rods 17 are linked to diffuse the stress outward to reduce the deformation caused by the pressure. The elastic effect of the spring 7 can effectively improve the supporting strength and enhance the supporting effect.

[0053] Specifically, the outer support mechanism includes:

[0054] The top cover 8 is fixedly connected to the upper end of the limiting groove 4, and the top of the top cover 8 is provided with a threaded hole 9.

[0055] The screw rod 10 is threadedly connected in the threaded hole 9, and the upper end of the screw rod 10 is fixedly connected with the rotating handle 11.

[0056] The double-headed sleeve ring 12 is rotatably connected to the lower end of the screw rod 10.

[0057] The extension rod 13 is fixedly connected to the lower end of the double-headed sleeve ring 12, and the lower end of the extension rod 13 is fixedly connected with multiple hinge shafts 15.

[0058] The expansion assembly is provided with multiple groups and is connected with corresponding hinge shafts 15 respectively; each group of expansion assemblies comprises a triangular rod 14 and a single ear shaft 16, one end of the triangular rod 14 is rotationally connected in the hinge shaft 15, the circumferential surface of the pile body 1 is provided with multiple embedded grooves 102, the triangular rod 14 is embedded in the embedded groove 102, the single ear shaft 16 is fixedly connected in the embedded groove 102, and the bent part of the triangular rod 14 is rotationally connected in the single ear shaft 16.

[0059] In specific embodiments of the present application, referring to Figure 5 and Figure 6 , the triangular rod 14 is located in the embedded groove 102 when it is not expanded, the top cover 8 is fixed at the upper end of the limiting groove 4, the movement distance of the lower support ring 5 and the upper support ring 6 can be limited, the double-headed sleeve ring 12 is used to connect the screw rod 10 and the extension rod 13, the double-headed sleeve ring 12 can move up and down by rotating the handle 11, the double-headed sleeve ring 12 drives the extension rod 13 to move up and down, and the extension rod 13 drives multiple hinge shafts 15 to move downward synchronously, as shown in Figure 7 , the position of the single ear shaft 16 is fixed and used for supporting the overall rotation of the triangular rod 14, and the hinge shaft 15 can drive multiple triangular rods 14 to expand outward when moving downward, thereby increasing the volume of the triangular rod 14 on the ground, making it difficult for the pile body 1 to move upward, greatly improving the stability and ensuring the supporting effect.

[0060] Specifically, the adjacent lower support ring 5 and upper support ring 6 are provided with a cross folding rod 17, and the ends of the cross folding rod 17 are rotationally connected to the edges of the lower support ring 5 and the upper support ring 6, respectively.

[0061] In specific embodiments of the present application, the cross folding rod 17 is a commonly used cross structure and is composed of two metal plates, the ends of the two metal plates are rotationally connected to the edges of the lower support ring 5 and the upper support ring 6, respectively, and the centers of the two metal plates are rotationally connected to each other to link the connected lower support ring 5 and upper support ring 6, so that when one group of lower support ring 5 and upper support ring 6 is displaced, the other group of lower support ring 5 and upper support ring 6 can be driven to displace synchronously, thereby diffusing the received pressure and improving the supporting effect.

[0062] Specifically, each base plate 2 is fixedly connected with a first ear shaft seat 20 on the side close to the pile body 1, the top of each upper support ring 6 is fixedly connected with a second ear shaft seat 21, and the two ends of the inclined rod 3 are rotationally connected between the first ear shaft seat 20 and the second ear shaft seat 21. Two inclined rods 3 are arranged between each first ear shaft seat 20 and second ear shaft seat 21.

[0063] In the specific embodiment of the present application, the inclined rods 3 are located between the pile body 1 and the base plate 2, and are movably connected between the pile body 1 and the upper supporting ring 6 through the first trunnion seat 20 and the second trunnion seat 21, and the force is transmitted to the pile body 1 through the inclined rods 3 when the base plate 2 is subjected to pressure, so as to provide a supporting effect, and every two inclined rods 3 form a group, and a triangular structure is formed between the pile body 1, the base plate 2 and the inclined rods 3, so as to reinforce the supporting effect.

[0064] Specifically, the inclined parts of the inclined rods 3 are each provided with a protruding block 22, a I-shaped connecting piece 24 is arranged between the adjacent two inclined rods 3, the two sides of the I-shaped connecting piece 24 are each provided with a clamping groove 2401, the protruding block 22 is embedded in the clamping groove 2401, and a strong matching plate 25 is rotatably connected between the adjacent I-shaped connecting pieces 24, and the inside of the strong matching plate 25 is fixedly connected with a level 26.

[0065] In the specific embodiment of the present application, the I-shaped connecting piece 24 is clamped between the two inclined rods 3, the position of the I-shaped connecting piece 24 is fixed by clamping the protruding block 22 in the clamping groove 2401, so that the two inclined rods 3 are more synchronous, the strong matching plate 25 is connected between the two I-shaped connecting pieces 24, the two ends of the strong matching plate 25 can rotate, the position of the base plate 2 and the pile body 1 is not accurate, the strong matching plate 25 will be tilted, the inclination angle can be directly observed through the level 26, and the inclination angle can be observed through the level 26, so that the inclination of the supporting angle of the base plate 2 can be more directly monitored.

[0066] Specifically, each base plate 2 is fixedly connected with two triangular plates 27 close to the pile body 1, the outside of each triangular plate 27 is fixedly connected with a positioning hole 29, each positioning hole 29 is detachably connected with a short ground spike 28, and the side of each triangular plate 27 is provided with a insertion slot 30, and the adjacent insertion slot 30 is detachably connected with a baffle 31.

[0067] In the specific embodiment of the present application, the adjacent two triangular plates 27 form a group, the positioning holes 29 are located on the sides away from the group of triangular plates 27, the stability of the triangular plates 27 is reinforced after the short ground spikes 28 are inserted into the ground, and there is a certain distance between the adjacent two triangular plates 27, and there is a semi-sealed area between the baffle 31 and the group of triangular plates 27 after the baffle 31 is inserted into the insertion slot 30, sand can be filled in the area, the supporting effect of the base plate 2 is further strengthened, and the base plate 2 is prevented from being tilted.

[0068] Specifically, the two sides of each base plate 2 are provided with stepped grooves 202, the top of each base plate 2 is provided with a base hole 201, and a long ground spike 18 is inserted into each base hole 201 from top to bottom, and the upper end of the adjacent long ground spike 18 is fixedly connected with a steel plate 19.

[0069] In the specific embodiment of the present application, the long ground spikes 18 are inserted into the ground after penetrating the base holes 201, and the steel plates 19 are connected to the two long ground spikes 18, so that the two adjacent base plates 2 are integrated as a whole without the need of bolts for fixation, and the installation and dismounting are simple, which facilitates the staff to assemble, and the design of the stepped grooves 202 can fill the gaps of the base plates 2, so that the structure is more solid after assembly.

[0070] The corner plates 32 are detachably connected to the corners of the base plates 2, and the reinforcing ribs 33 are welded between the inner walls of the corner plates 32.

[0071] In the specific embodiment of the present application, referring to Figure 1 and Figure 2 , the corner plates 32 are installed at the corners of the base plates 2, and the top of the corner plates 32 is also provided with the base holes 201, and the side of the corner plates 32 is also provided with the stepped grooves 202, so that the structure is uniform and the installation is faster.

[0072] A micro pile foundation pit supporting method, comprising the following steps:

[0073] S1, sequentially adhere each base plate 2 to the pit wall of the foundation pit, and then drive the short ground spikes 28 into the ground to fix the position of the base plate 2;

[0074] S2, then insert the long ground spikes 18 into the base holes 201, and drive the ends of the long ground spikes 18 into the ground to fix the connection between the two adjacent base plates 2;

[0075] S3, after the position of the base plate 2 is fixed, punch holes in the bottom of the foundation pit, and sequentially bury each pile body 1, so that the position of each pile body 1 corresponds to the base plate 2, then connect the inclined rods 3 between the upper support rings 6 and the base plates 2, so that the pile bodies 1, the base plates 2 and the inclined rods 3 form a triangular structure to increase the stability;

[0076] S4, install the lower support ring 5, the upper support ring 6 and the spring 7 on the surface of the limiting groove 4, when the base plate 2 is subjected to pressure, the upper support ring 6 transmits the pressure to the spring 7, and the stress is diffused outward through the linkage of the cross-folded rods 17 to reduce the deformation caused by the pressure;

[0077] S5, rotate the handle 11 to drive the screw rod 10 to rotate, and the screw rod 10 drives the extension rod 13 to move downward, so that the plurality of triangular rods 14 are expanded outward under the displacement of the hinge shaft 15, the volume of the triangular rods 14 in the ground is increased, the upward movement of the pile body 1 is blocked, and the supporting effect is improved.

[0078] The working principle or working process of the micro pile foundation pit supporting device provided by the application is as follows: the pile body 1, the base plate 2 and the inclined rod 3 form a triangular structure, the adjacent base plates 2 are connected in a splicing manner, and the two sides of the base plate 2 are provided with stepped grooves 202, so that the connection strength can be increased and the gap between the adjacent base plates 2 can be reduced; after the pile body 1 is inserted into the ground, the triangular rod 14 is also located in the ground, the rotating handle 11 is located on the upper side of the top cover 8, the rotating handle 11 is rotated to drive the screw rod 10 to rotate, the screw rod 10 is used to push the extension rod 13 to move downward, and then the plurality of triangular rods 14 are expanded outward, so that the volume of the triangular rod 14 in the ground is increased, the area of the planar structure is expanded, the triangular rod 14 is used to block the upward movement of the pile body 1, the stability and supporting effect of the pile body 1 are strengthened, and the limiting groove 4 is used to limit the linear movement and movement distance of the lower supporting ring 5 and the upper supporting ring 6; the spring 7 is sleeved on the circumferential surface of the limiting groove 4, the cross folding rod 17 is arranged between the adjacent pile bodies 1, the cross folding rod 17 has a telescopic structure, when the base plate 2 is subjected to pressure, the upper supporting ring 6 transmits the pressure to the spring 7, the cross folding rod 17 is linked to diffuse the stress outward, so that the deformation caused by the pressure is reduced, the spring 7 is elastically deformed, the supporting strength can be effectively improved, and the supporting effect is strengthened.

[0079] Finally, it should be noted that: the above only describes the preferred embodiments of the application and is not used to limit the application, although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement for some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A micropile foundation pit support device characterized by, The utility model provides a support structure of pile, including: a pile body (1) is provided with a plurality of and evenly distributed, its inside is provided with the installation cavity (101) uniformly, its top is provided with the limit slot (4); a base plate (2) is provided with a plurality of and with the position corresponding with the pile body (1), with the corresponding pile body (1) between all are provided with the diagonal rod (3); a torsion mechanism is provided with a plurality of groups and is arranged on every limit slot (4) respectively, and it includes lower support ring (5), upper support ring (6) and spring (7), lower support ring (5) and upper support ring (6) all are slidingly connected on the surface of limit slot (4), and spring (7) is located between lower support ring (5) and upper support ring (6); and a outer support mechanism is provided with a plurality of groups and is arranged on every pile body (1) respectively, and it is through expanding support area to improve the support effect; The outer support mechanism includes: a top cover (8) is fixedly connected to the upper end of limit slot (4), and the top of the top cover (8) is provided with a threaded hole (9); a screw rod (10) is threadedly connected in the threaded hole (9), and the upper end of the screw rod (10) is fixedly connected with a rotating handle (11); a double-end sleeve ring (12) is rotatably connected to the lower end of the screw rod (10); an extension rod (13) is fixedly connected to the lower end of the double-end sleeve ring (12), and the lower end of the extension rod (13) is fixedly connected with a plurality of hinge shafts (15); and an expansion assembly is provided with a plurality of groups and is connected with the corresponding hinge shaft (15) respectively; Each group of the expansion assembly includes a triangular rod (14) and a single ear shaft (16), one end of the triangular rod (14) is rotatably connected in the hinge shaft (15), the circumferential surface of the pile body (1) is provided with a plurality of outer embedding grooves (102), the triangular rod (14) is embedded in the outer embedding groove (102), the single ear shaft (16) is fixedly connected in the outer embedding groove (102), and the bent part of the triangular rod (14) is rotatably connected in the single ear shaft (16); Crossed folding rods (17) are arranged between adjacent lower support rings (5) and upper support rings (6), and the ends of the crossed folding rods (17) are rotatably connected to the edges of the lower support rings (5) and the upper support rings (6).

2. A micropile foundation pit support device according to claim 1, characterized by Each base plate (2) is fixedly connected with a first trunnion seat (20) on the side close to the pile body (1), the top of each upper support ring (6) is fixedly connected with a second trunnion seat (21), and the two ends of the diagonal rod (3) are rotatably connected between the first trunnion seat (20) and the second trunnion seat (21). Two diagonal rods (3) are arranged between each first trunnion seat (20) and second trunnion seat (21).

3. A micropile foundation pit support device according to claim 2, characterized in that, The inclined parts of the diagonal rods (3) are provided with protruding blocks (22), and a I-shaped connecting piece (24) is arranged between adjacent two diagonal rods (3). The two sides of the I-shaped connecting piece (24) are provided with clamping grooves (2401), the protruding blocks (22) are embedded in the clamping grooves (2401), a strong matching plate (25) is rotatably connected between adjacent I-shaped connecting pieces (24), and a level (26) is fixedly connected in the strong matching plate (25).

4. A micropile foundation pit support device according to claim 3, characterized by Each of the base plate (2) near the pile (1) side is fixedly connected with two triangular plate (27), each of the triangular plate (27) outer side is fixedly connected with positioning hole (29), each of the positioning hole (29) is detachably connected with short ground thorn (28).

5. A micropile foundation pit support device according to claim 4, characterized by The side of each of the triangular plate (27) is provided with a slot (30), the adjacent slot (30) is detachably connected with a baffle (31), both sides of each of the base plate (2) is provided with a stepped groove (202), the top of each of the base plate (2) is provided with a base hole (201), each of the base hole (201) is inserted with a long ground thorn (18) from top to bottom, the upper end of the adjacent long ground thorn (18) is fixedly connected with a steel plate (19).

6. A micropile foundation pit support device according to claim 5, wherein It also includes a corner plate (32), the corner plate (32) is detachably connected to the corner of the base plate (2), the inner wall of the corner plate (32) is welded with a reinforcing rib (33).

7. A method for supporting a foundation pit by using micro-piles, applied to the micro-pile foundation pit supporting device of claim 6, characterized in that, It includes the following steps: S1, sequentially adhere each base plate (2) to the pit wall of the foundation pit, then drive the short ground thorn (28) into the ground, fix the position of the base plate (2); S2, then insert the long ground thorn (18) into the base hole (201), and drive the end of the long ground thorn (18) into the ground to fix the connection between the two adjacent base plates (2); S3, after the position of the base plate (2) is fixed, drill holes in the bottom of the foundation pit, and sequentially bury each pile (1), so that the position of each pile (1) corresponds to the base plate (2), then connect the inclined rod (3) between the upper support ring (6) and the base plate (2), so that the pile (1), the base plate (2) and the inclined rod (3) form a triangular structure, which improves the stability; S4, install the lower support ring (5), the upper support ring (6) and the spring (7) on the surface of the limiting groove (4), when the base plate (2) is subjected to pressure, the upper support ring (6) transmits the pressure to the spring (7), and the stress is diffused outward under the linkage action of the cross folding rod (17), so as to reduce the deformation caused by pressure; S5, rotate the handle (11) to drive the screw rod (10) to rotate, the screw rod (10) drives the extension rod (13) to move downward, so that the plurality of triangular rods (14) expand outward under the displacement action of the hinge shaft (15), increase the volume of the triangular rod (14) in the ground, block the upward movement of the pile (1), and improve the supporting effect.

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