A support system for a foundation pit

Abstract

The present invention discloses a support system for a foundation pit, belonging to the technical field of building construction. It includes a number of flexible support rings stacked in sequence along the vertical direction; the radial support assembly includes a base, a slider, a screw, a pressing plate, a spring, a connecting rod, and an arc-shaped support plate. The arc-shaped support plate is arranged vertically and its arc is adapted to the arc of the flexible support ring. The lower end of the arc-shaped support plate is connected to the slider through the connecting rod; the arc-shaped support plate is connected to the flexible support ring, and the arc-shaped support plates of each radial support assembly are evenly spaced circumferentially and simultaneously support the inner wall of the flexible support ring. By using an annular flexible support ring to replace the conventional support method, when the soil pressure outside the formwork increases, each flexible support ring deforms synchronously at this position, thus avoiding the problem of relative displacement between two adjacent formworks and the appearance of gaps, and effectively solving the problem of water seepage.

Description

Technical Field

[0001] The present invention belongs to the technical field of building construction, and particularly relates to a support system for a foundation pit. Background Art

[0002] Currently, in building engineering, before and after the excavation of a foundation pit, a concrete support system is usually used for support. This type of formwork system includes a number of vertical formworks, and each formwork supports the inner side of the foundation pit by a circumferentially uniformly distributed support method. However, due to the earth pressure outside the formwork or cavity problems, it is extremely easy to cause situations such as formwork bulging, deformation, and radial displacement of the formwork, resulting in relative displacement between two adjacent circumferential formworks and thus gaps. External groundwater can easily enter the foundation pit through these gaps, bringing great inconvenience to the subsequent pouring construction work. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a support system for a foundation pit, which can flexibly support the side wall of the foundation pit to avoid the occurrence of the above technical problems.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A support system for a foundation pit of the present invention includes a number of flexible support rings stacked in sequence along the vertical direction. Each flexible support ring is coaxially arranged. The flexible support ring is supported on the side wall of the foundation pit by a number of radially support components uniformly distributed along the circumference; the radially support component includes a base, a slider, a screw, a pressing plate, a spring, a connecting rod, and an arc-shaped support plate. The base is fixed to the bottom of the foundation pit. A chute is opened on the upper surface of the base along the radial direction of the flexible support ring. The slider is slidably arranged in the chute. The screw passes through the chute along the radial direction and is threadedly connected to the base. The pressing plate is fixed in the middle of the screw. The spring is sleeved outside the screw. The two ends of the spring are respectively connected to the pressing plate and the slider; the arc-shaped support plate is arranged vertically and its radian is adapted to the radian of the flexible support ring. The lower end of the arc-shaped support plate is connected to the slider through a connecting rod; the arc-shaped support plate is connected to the flexible support ring. The arc-shaped support plates of each radially support component are evenly spaced in the circumferential direction and simultaneously support the inner wall of the flexible support ring.

[0006] Furthermore, the arc-shaped support plate is formed by sequentially combining at least two sub-support plates vertically. An inner edge plate is fixed to the inner wall of the sub-support plate. Adjacent two sub-support plates are connected by a locking assembly. The locking assembly includes a first connecting plate, a first connecting rod, a locking bolt, a second connecting rod, and a second connecting plate. The first connecting plate and the second connecting plate are respectively connected to the inner edge plates on adjacent two sub-support plates. One end of the first connecting rod is hinged to the first connecting plate, and the other end of the first connecting rod is fixedly connected to one end of the second connecting rod through the locking bolt. The other end of the second connecting rod is hinged to the second connecting plate.

[0007] Furthermore, an arc-shaped groove is formed on the inner edge plate, and first through holes are formed on both the first connecting plate and the second connecting plate. The locking bolt passes through the arc-shaped groove and the first through hole at the same time to connect the inner edge plate with the first connecting plate or the second connecting plate.

[0008] Furthermore, an opening groove is formed on the sub-support plate along the circumferential direction, and a second through hole is formed on the flexible support ring. The sub-support plate and the flexible support ring are connected by a limit bolt. The limit bolt passes through the second through hole and the opening groove at the same time to connect the sub-support plate and the flexible support ring.

[0009] Furthermore, a sleeve is fixed to one end of the base away from the screw, and the screw is threadedly connected to the sleeve at the same time. A bottom support ring plate is installed at the bottom of the foundation pit, and each sleeve is supported by the bottom support ring plate at the same time.

[0010] Furthermore, a pressure sensor is installed on one side of the slider facing the pressing plate, and both ends of the spring are connected to the pressing plate and the pressure sensor on the slider respectively.

[0011] Furthermore, a center pile is fixed along the axial direction at the center of the foundation pit. A calibration ring is coaxially fixed to the lower end of the center pile. A rangefinder is installed on the connecting rod, and the calibration ring corresponds to the rangefinder.

[0012] Furthermore, a top support ring plate is arranged above the foundation pit. A support frame is installed on the top support ring plate. A first motor is installed at the upper end of the support frame. The output end of the first motor is connected to the center frame. The center frame is rotationally matched with the center pile, and a roller assembly is installed on the center frame.

[0013] Furthermore, the roller assembly includes a center cylinder. Support plates are evenly distributed on the outer circumference of the center cylinder. The support plates are hinged to the sliding seats through connecting plates. The sliding seats are slidably matched with guide rails. The guide rails are fixed on the lower side of the center frame along the radial direction of the center cylinder. A pin shaft is fixed on the sliding seat. The pin shaft is connected to the roller through a bracket. The center cylinder is coaxially connected to the output end of a second motor. The second motor is fixed on the center frame.

[0014] Further, the drum is formed by sequentially splicing a plurality of short drums along the axial direction. One end of each short drum is provided with a screw rod. One end of the screw rod is rotatably arranged inside the short drum, and the other end of the screw rod extends outwards. A threaded hole matching the screw rod is opened at the center of the other end of the short drum. The screw rod on the uppermost short drum is fixed to the bracket through a locking member.

[0015] The beneficial effects of the present invention are as follows:

[0016] A support system for a foundation pit disclosed by the present invention replaces the conventional support method with an annular flexible support ring. When the soil pressure outside the formwork increases, each flexible support ring deforms synchronously at this position, thereby avoiding the problem of relative displacement and gaps between adjacent two formworks in the background art, and effectively solving the problem of water seepage.

[0017] In the device of the present invention, by adopting the elastic support method, when there is a cavity outside the outside of the formwork, it can push each flexible support ring to deform outwards at this position, so as to compress the soil at this place through the flexible support ring to fill the cavity part, preventing the occurrence of larger ground collapses and increasing the stability of the formwork.

[0018] In the device of the present invention, by rotating the screw, the pressing plate can be driven to axially move to compress the spring, and the pressing degree of the elastic pre-tightening can be adjusted to adapt to the elastic support force required under different terrains, ensuring more stable support for the side wall of the foundation pit.

[0019] Other advantages, objectives and features of the present invention will be described in the subsequent description, and to some extent, they are obvious to those skilled in the art, or those skilled in the art can obtain teachings from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To make the objectives, technical solutions and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0021] Figure 1 is a schematic structural view of the support system of the present invention Figure 1 ;

[0022] Figure 2 is a schematic structural view of the support system of the present invention Figure 2 ;

[0023] Figure 3 is a schematic structural view of the radial support assembly;

[0024] Figure 4 is a schematic view of the cooperation between the slider and the base;

[0025] Figure 5 It is a schematic structural diagram of the sub - support plate;

[0026] Figure 6 It is a schematic structural diagram of the flexible support ring;

[0027] Figure 7 It is a schematic distribution diagram of the rollers;

[0028] Figure 8 It is a cross - sectional view when the support system of the present invention is in use.

[0029] The reference signs in the drawings are as follows: flexible support ring 1, radial support assembly 2, base 3, slider 4, screw 5, pressing plate 6, spring 7, connecting rod 8, arc - shaped support plate 9, chute 10, sub - support plate 11, inner edge plate 12, first connecting plate 13, first connecting rod 14, locking bolt 15, second connecting rod 16, second connecting plate 17, arc - shaped groove 18, first through - hole 19, open slot 20, second through - hole 21, limit bolt 22, pressure sensor 23, center pile 24, calibration ring 25, rangefinder 26, sleeve 27, bottom support ring plate 28, top support ring plate 29, support frame 30, first motor 31, center frame 32, center cylinder 33, support plate 34, sliding seat 35, guide rail 36, pin shaft 37, support 38, second motor 39, short cylinder 40, screw rod 41, threaded hole 42, connecting plate 43. Detailed implementation manners

[0030] As Figures 1 to 8 shown, a support system for a foundation pit of the present invention includes a plurality of flexible support rings 1 stacked in sequence along the vertical direction. The flexible support rings 1 are made of elastic steel rings, which can prevent rusting, and the thickness is between 0.5 mm and 5 mm, and can at least be stretched and deformed radially.

[0031] Specifically, the flexible support rings 1 are of the same size and coaxially arranged. The flexible support rings 1 are stacked in sequence along the vertical direction to adapt to foundation pits of different depths. At the same time, the flexible support rings 1 are supported on the side wall of the foundation pit by a plurality of radially - distributed radial support assemblies 2 along the circumferential direction to provide basic support force.

[0032] In an embodiment of the present invention, the radial support assembly 2 includes a base 3, a slider 4, a screw 5, a pressing plate 6, a spring 7, a connecting rod 8, and an arc - shaped support plate 9. The base 3 is plate - shaped, the base 3 is fixed to the bottom of the foundation pit, and the base 3 is provided with holes for fixedly connecting with the bottom of the foundation pit. A chute 10 is opened on the upper surface of the base 3 along the radial direction of the flexible support ring 1. The slider 4 is slidably arranged in the chute 10. The screw 5 passes through the chute 10 along the radial direction and is threadedly connected to the base 3. The slider 4 is slidably matched with the smooth rod part of the screw 5. Under the guiding action of the chute 10, the slider 4 can displace along the radial direction.

[0033] Among them, the pressing plate 6 is fixed in the middle of the screw 5, at least at the position where the screw 5 is exposed in the sliding groove 10. The spring 7 is sleeved outside the screw 5. The two ends of the spring 7 are respectively connected to the pressing plate 6 and the slider 4. The spring 7 provides an elastic pre-pressure for the slider 4, so that the slider 4 has a tendency to slide outwards; the arc-shaped support plate 9 is in the shape of a tile. The arc-shaped support plate 9 is arranged vertically and its arc is adapted to the arc of the flexible support ring 1. The outer side surface of the arc-shaped support plate 9 can abut against the flexible support ring 1. The lower end of the arc-shaped support plate 9 is connected to the slider 4 through a connecting rod 8. When the slider 4 moves, the connecting rod 8 can also drive the arc-shaped support plate 9 to displace synchronously; of course, in order to ensure the synchronous movement of each flexible support ring 1, the present invention connects the arc-shaped support plate 9 with each vertical flexible support ring 1 together. The arc-shaped support plates 9 of each radial support assembly 2 are arranged at equal intervals in the circumferential direction and support the inner wall of the flexible support ring 1 synchronously.

[0034] By using the annular flexible support ring 1 to replace the conventional support method, when the earth pressure outside the formwork increases, each flexible support ring 1 deforms synchronously at this position, thus avoiding the relative displacement between two adjacent formworks and the appearance of gaps in the background art, and effectively solving the problem of water seepage.

[0035] In this embodiment, a sleeve 27 is fixed at one end of the base 3 away from the screw 5. The sleeve 27 is coaxially arranged with the screw 5, and the screw 5 is also threadedly connected to the sleeve 27, providing a longer threaded connection channel for the screw 5. A bottom support ring plate 28 is installed at the bottom of the foundation pit, and each sleeve 27 is supported by the bottom support ring plate 28 at the same time. Under the support of the bottom support ring plate 28, it is effectively ensured that the lower surface of the base 3 remains flat and the base 3 is prevented from sinking into the soil.

[0036] In this embodiment, the arc-shaped support plate 9 is formed by sequentially combining at least two sub-support plates 11 in the vertical direction. An inner edge plate 12 is fixed to the inner wall of the sub-support plate 11. Adjacent two sub-support plates 11 are connected into a whole through a locking assembly. The inner edge plate 12 has a certain thickness, and the inner edge plate 12 contacts the roller assembly to prevent the locking assembly from interfering with the roller assembly. Wherein, the locking assembly includes a first connecting plate 13, a first connecting rod 14, a locking bolt 15, a second connecting rod 16 and a second connecting plate 17. The first connecting plate 13 is arranged parallel to the lower side of the upper inner edge plate 12, and the second connecting plate 17 is arranged parallel to the upper side of the lower inner edge plate 12. The first connecting plate 13 and the second connecting plate 17 are respectively connected to the inner edge plates 12 on adjacent two sub-support plates 11. One end of the first connecting rod 14 is hinged to the first connecting plate 13. After adjusting the relative positions of the first connecting rod 14 and the second connecting rod 16, the other end of the first connecting rod 14 is fixedly connected to one end of the second connecting rod 16 through the locking bolt 15, and the other end of the second connecting rod 16 is hinged to the second connecting plate 17. By detachably connecting the first connecting rod 14 and the second connecting rod 16 with the locking bolt 15, it is possible to adapt to the possible installation errors between adjacent two sub-support plates 11, which is more convenient for the assembly of the arc-shaped support plate 9.

[0037] In this embodiment, an arc-shaped groove 18 is formed on the inner edge plate 12, and first through holes 19 are formed on both the first connecting plate 13 and the second connecting plate 17. The locking bolt 15 simultaneously passes through the arc-shaped groove 18 and the first through hole 19 to connect the inner edge plate 12 with the first connecting plate 13 or the second connecting plate 17. By detachably connecting the inner edge plate 12 with the first connecting plate 13 or the second connecting plate 17, multiple sub-support plates 11 can be selected for combined installation to form the arc-shaped support plate 9 according to the on-site needs, which can adapt to foundation pits with different depths.

[0038] In this embodiment, an opening groove 20 is formed on the sub-support plate 11 in the circumferential direction. The plane where the opening groove 20 is located is parallel to the horizontal plane. A second through hole 21 is formed on the flexible support ring 1. The sub-support plate 11 and the flexible support ring 1 are connected through a limit bolt 22. The limit bolt 22 simultaneously passes through the second through hole 21 and the opening groove 20 to connect the sub-support plate 11 and the flexible support ring 1. The limit bolt 22 can be used to limit the radial displacement of the sub-support plate 11 and the flexible support ring 1 on the flexible support ring 1 to prevent the sub-support plate 11 from disengaging from the flexible support ring 1. However, the limit bolt 22 can slide along the opening groove 20 to prevent it from restricting the flexible support ring 1 when the flexible support ring 1 deforms. During the use of the present invention, the length of the sub-support plate 11 can be reasonably selected according to the needs to correspond to the width of the flexible support ring 1, ensuring that the opening groove 20 corresponds to the flexible support ring 1 one by one. At the same time, the design position of the opening groove 20 can also be determined to achieve standardized production and save costs.

[0039] In this embodiment, a pressure sensor 23 is installed on the side of the slider 4 facing the pressing plate 6, and both ends of the spring 7 are connected to the pressing plate 6 and the pressure sensor 23 on the slider 4 respectively. By setting the pressure sensor 23, the pressure on each arc-shaped support plate 9 can be monitored, and corresponding measures can be taken in time to avoid accidents.

[0040] In this embodiment, a central pile 24 is fixed along the axial direction at the center of the foundation pit, a calibration ring 25 is coaxially fixed at the lower end of the central pile 24, a rangefinder 26 is installed on the connecting rod 8, and the calibration ring 25 corresponds to the rangefinder 26. By setting the rangefinder 26 to measure the position of the connecting rod 8, the displacement of the arc-shaped support plate 9 can also be reflected. When the displacement threshold is exceeded, an alarm can be given, which is convenient for construction personnel to take corresponding measures.

[0041] In this embodiment, a top support ring plate 29 is arranged above the foundation pit, a support frame 30 is installed on the top support ring plate 29, a first motor 31 is installed at the upper end of the support frame 30, the output end of the first motor 31 is connected to the central frame 32, the central frame 32 is rotationally matched with the central pile 24, and a roller assembly is installed on the central frame 32. The first motor 31 drives the central frame 32 and the roller assembly to rotate, and the roller assembly acts on the inner surface of the inner edge plate 12, so that the inner side wall of the flexible support ring 1 can be rolled, and the bulging part of the flexible support ring 1 protruding inward can be trimmed, avoiding the water seepage problem and potential safety hazards caused by greater earth pressure.

[0042] In this embodiment, the roller assembly includes a central cylinder 33, support plates 34 are evenly distributed along the circumference on the outside of the central cylinder 33, the support plates 34 are hinged to the sliding seats 35 through connecting plates 43, the sliding seats 35 are slidably matched with the guide rails 36, and the guide rails 36 are fixed on the lower side surface of the central frame 32 along the radial direction of the central cylinder 33; a pin shaft 37 is fixed on the sliding seat 35, the pin shaft 37 is connected to the roller through a bracket 38, the central cylinder 33 is coaxially connected to the output end of a second motor 39, and the second motor 39 is fixed on the central frame 32. When the second motor 39 rotates, it can drive the central cylinder 33 to rotate. After the central cylinder 33 rotates, the support plates 34 on its outside drive the sliding seats 35 to move through the connecting plates 43, and the sliding seats 35 can slide along the guide rails 36, so that the roller can move along the radial direction of the foundation pit, realizing the adjustment of the rolling position of the roller.

[0043] In the present invention, the roller is composed of a plurality of short cylinders 40 spliced in sequence along the axial direction. One end of the short cylinder 40 is provided with a screw rod 41, one end of the screw rod 41 is rotatably arranged inside the short cylinder 40, the other end of the screw rod 41 extends outward, a threaded hole 42 matching the screw rod 41 is opened at the center of the other end of the short cylinder 40, and the screw rod 41 on the uppermost short cylinder 40 is fixed to the bracket 38 through a locking member. The short cylinders 40 can be spliced in sequence along the axial direction to form a roller, which can meet the needs of foundation pits with different depths and is convenient for installation.

[0044] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A support system for a foundation pit, characterized in that: It includes a number of flexible support rings stacked vertically in sequence, and each flexible support ring is coaxially arranged. The flexible support rings are supported on the side wall of the foundation pit by a number of radial support components evenly distributed in the circumferential direction. The radial support component includes a base, a slider, a screw, a pressing plate, a spring, a connecting rod, and an arc-shaped support plate. The base is fixed to the bottom of the foundation pit. A chute is opened on the upper surface of the base along the radial direction of the flexible support ring. The slider is slidably arranged in the chute. The screw passes through the chute along the radial direction and is threadedly connected to the base. The pressing plate is fixed in the middle of the screw. The spring is sleeved on the outside of the screw, and the two ends of the spring are respectively connected to the pressing plate and the slider. The arc-shaped support plate is arranged vertically and its radian is adapted to the radian of the flexible support ring. The lower end of the arc-shaped support plate is connected to the slider through a connecting rod. The arc-shaped support plate is connected to the flexible support ring. The arc-shaped support plates of each radial support component are evenly spaced in the circumferential direction and simultaneously support the inner wall of the flexible support ring. The arc-shaped support plate is formed by at least two sub-support plates combined vertically in sequence. An inner edge plate is fixed on the inner wall of the sub-support plate. Adjacent two sub-support plates are connected by a locking component. The locking component includes a first connecting plate, a first connecting rod, a locking bolt, a second connecting rod, and a second connecting plate. The first connecting plate and the second connecting plate are respectively connected to the inner edge plates on adjacent two sub-support plates. One end of the first connecting rod is hinged to the first connecting plate, and the other end of the first connecting rod is fixedly connected to one end of the second connecting rod through the locking bolt. The other end of the second connecting rod is hinged to the second connecting plate. An arc-shaped groove is opened on the inner edge plate. First through holes are opened on both the first connecting plate and the second connecting plate. The locking bolt passes through the arc-shaped groove and the first through hole simultaneously to connect the inner edge plate to the first connecting plate or the second connecting plate.

2. The support system for a foundation pit according to claim 1, characterized in that: An opening groove is opened on the sub-support plate in the circumferential direction. A second through hole is opened on the flexible support ring. The sub-support plate and the flexible support ring are connected by a limit bolt. The limit bolt passes through the second through hole and the opening groove simultaneously to connect the sub-support plate and the flexible support ring.

3. The support system for a foundation pit according to claim 1, characterized in that: A sleeve is fixed at one end of the base away from the screw. The screw is also threadedly connected to the sleeve. A bottom support ring plate is installed at the bottom of the foundation pit. Each sleeve is supported by the bottom support ring plate simultaneously.

4. The support system for a foundation pit according to any one of claims 1-3, characterized in that: A pressure sensor is installed on one side of the slider facing the pressing plate. The two ends of the spring are respectively connected to the pressing plate and the pressure sensor on the slider.

5. The support system for a foundation pit according to claim 4, characterized in that: A central pile is fixed axially in the center of the foundation pit. A calibration ring is coaxially fixed at the lower end of the central pile. A rangefinder is installed on the connecting rod. The calibration ring corresponds to the rangefinder.

6. The support system for a foundation pit according to claim 5, characterized in that: A top support ring plate is arranged above the foundation pit. A support frame is installed on the top support ring plate. A first motor is installed at the upper end of the support frame. The output end of the first motor is connected to a central frame. The central frame is rotationally matched with the central pile. A roller assembly is installed on the central frame.

7. The support system for a foundation pit according to claim 6, characterized in that: The drum assembly includes a central cylinder. On the outer circumference of the central cylinder, support plates are evenly distributed. The support plates are hinged to sliding seats through connecting plates. The sliding seats are in sliding fit with guide rails. The guide rails are fixed on the lower side surface of the central frame along the radial direction of the central cylinder. A pin shaft is fixed on the sliding seat. The pin shaft is connected to the drum through a bracket. The central cylinder is coaxially connected to the output end of a second motor. The second motor is fixed on the central frame.

8. The support system for a foundation pit according to claim 7, characterized in that: The drum is formed by sequentially splicing a plurality of short cylinders along the axial direction. One end of each short cylinder is provided with a screw rod. One end of the screw rod is rotatably arranged inside the short cylinder. The other end of the screw rod extends outwards. A threaded hole matching with the screw rod is formed at the center of the other end of the short cylinder. The screw rod on the uppermost short cylinder is fixed to the bracket through a locking member.

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