Foundation pit supporting device

Abstract

The invention belongs to the field of retaining structures, and particularly relates to a foundation pit supporting device which comprises a supporting assembly. The fixing assembly is mounted on the supporting assembly; the connecting assembly is mounted on the supporting assembly; the pouring assembly is mounted on the supporting assembly; the supporting assembly comprises a center block and a plurality of connecting modules. The fixing assembly comprises a cover plate, a locking piece, an anchor cable and an anchor rod. Locking piece mechanical fixation replaces grouting initial setting waiting, the rapid supporting requirement of emergency rescue is met, long-term stability is achieved through secondary tensioning and connecting beam pouring in the later period, site wet operation is reduced through the prefabricated assembly, and the supporting assembly is particularly suitable for severe geological conditions such as rainfall and frozen soil; and through rapid splicing of the inserting blocks and the anchor rods, on-site construction complexity is reduced, manual assembly can be achieved, and one-by-one hoisting is not needed.

Description

Technical Field

[0001] The invention belongs to the field of retaining structures, and in particular relates to a foundation pit supporting device. Background Art

[0002] Traditional slope retaining structures mostly use circular or simple geometric anchor piers, which have stress concentration leading to soil collapse and low construction efficiency. The casting of special-shaped anchor piers is complicated, and grouting and fixing takes several hours. The integrity is poor, and there is a lack of rigid connection between the anchor piers, which can easily lead to chain instability. The ability to resist dynamic loads is weak and it is difficult to resist earthquakes or traffic vibration torque. In addition, the traditional grouting process cannot meet the needs of rapid reinforcement for emergency rescue, delaying the opportunity for slope protection. Summary of the Invention

[0003] In order to overcome the shortcomings of the existing technology, the present invention provides a foundation pit support device, which effectively solves the problems that traditional slope support structures mostly use circular or simple geometric anchor piers, which have stress concentration leading to soil collapse and low construction efficiency. The casting of special-shaped anchor piers is complicated, and grouting and fixing takes several hours. The integrity is poor, and there is a lack of rigid connection between the anchor piers, which easily leads to chain instability. The ability to resist dynamic loads is weak, and it is difficult to resist earthquakes or traffic vibration torque. In addition, the traditional grouting process cannot meet the needs of rapid reinforcement for emergency rescue, thereby delaying the timing of slope protection.

[0004] One embodiment of the present invention provides a foundation pit supporting device, comprising:

[0005] Support components;

[0006] A fixing assembly, the fixing assembly being mounted on the supporting assembly;

[0007] a connecting assembly, the connecting assembly being mounted on the supporting assembly;

[0008] A casting assembly, wherein the casting assembly is mounted on the supporting assembly;

[0009] Wherein, the support assembly includes a central block and a plurality of connection modules, and the plurality of connection modules are mounted on the central block;

[0010] The fixing assembly includes a cover plate, a locking piece, an anchor cable and an anchor rod, the cover plate is mounted on the support assembly, the locking piece is located on a side of the cover plate away from the support assembly, the anchor cable passes through the support assembly and the cover plate and is threadedly connected to the locking piece, and the anchor rod is threadedly connected to an end of the anchor cable away from the locking piece;

[0011] The connecting assembly is used to connect the supporting assembly to another supporting assembly, and the casting assembly is used to install the supporting assembly with another supporting assembly.

[0012] A foundation pit supporting device of the present invention,

[0013] In one embodiment, the connecting assembly includes a connecting portion, a long rod, a telescopic rod and a damping plate.

[0014] In one embodiment, the connecting portion is mounted on the supporting assembly, and the supporting assembly is provided with an insertion hole that is adapted to the size of the connecting portion;

[0015] The support assembly is provided with a clamping space, the clamping space is communicated with the insertion hole, and the connecting portion is located in the clamping space.

[0016] In one embodiment, the long rod is fixedly arranged on a side of the connecting portion away from the supporting assembly.

[0017] In one embodiment, the telescopic rod is sleeved on an end of the long rod away from the connecting portion.

[0018] In one embodiment, the damping plate is symmetrically mounted on the inner wall of the telescopic rod, a sliding space is formed between the telescopic rod and the long rod, and the damping plate is located in the sliding space;

[0019] The damping plate is in a curved arc shape.

[0020] In one embodiment, the casting assembly includes a plurality of U-shaped members, and the plurality of U-shaped members are clamped on the supporting assembly;

[0021] The U-shaped member is used for casting so that the support assembly is connected to another anchor pier.

[0022] In one embodiment, the connection module includes a combination block and an insert block, and the central block is provided with jacks adapted to the number of the insert blocks;

[0023] The insert block is located in the insert hole, and the combination block is fixed on the central block through the insert block;

[0024] The insert block is provided with a fixing hole;

[0025] The heights of the sockets on the central block are not all at the same level.

[0026] In one embodiment, the central axes of the fixing holes on each of the insert blocks coincide with each other, and each of the fixing holes is sleeved around the outer periphery of the anchor cable, and the assembly block is fixedly connected to the central block via the anchor cable.

[0027] In one embodiment, the locking member is provided with a rotating handle, the rotating handle is provided with a polygonal locking block, the locking member is provided with a locking groove that is adapted to the shape of the polygonal locking block, and the rotating handle is set on the locking member through the polygonal locking block.

[0028] The foundation pit support device provided by the above technical solution has the following beneficial effects:

[0029] 1. The support components adopt a split design of central block and combination block, which can be quickly assembled through plug-in blocks and anchor rods, reducing the complexity of on-site construction. They can also be assembled manually without the need to hoist them one by one.

[0030] 2. The telescopic rod and damping plate design of the connecting component can flexibly adjust the spacing to meet the requirements of different anchor pier spacing. At the same time, it serves as built-in reinforcement during pouring to prevent the connecting beam from breaking easily after pouring.

[0031] 3. Anchor rods a and b are connected by threads. After the first tensioning, the stress is maintained by the locking piece. After the second excavation, the stress can be applied again to achieve dynamic reinforcement. The rotating handle and polygonal clamping block design simplify the anchor rotation operation.

[0032] 4. The U-shaped casting component is directly connected to the anchor pier, eliminating the traditional stirrup binding step. After casting, an integrated connecting beam is formed to improve the crack resistance. The connecting component is combined with the concrete during casting to enhance the integrity of the connecting beam and avoid the positioning deviation problem of the reserved steel bars.

[0033] 5. Through the cyclic process of excavation, grooving, support and secondary tensioning, the slope is reinforced in stages to reduce the disturbance to the slope caused by a single construction.

[0034] 6. Mechanical fixation of locking parts replaces the waiting time for initial setting of grouting, meeting the needs of rapid support in emergency rescue. In the later stage, long-term stability is achieved through secondary tensioning and pouring of connecting beams. Prefabricated components reduce on-site wet operations and are especially suitable for harsh geological conditions such as rainfall and frozen soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 the structures shown in these drawings without paying any creative work.

[0036] Figure 1 It is a structural schematic diagram of the present invention;

[0037] Figure 2 Schematic diagram of part of the structure of the present invention Figure 1 ;

[0038] Figure 3 It is a structural diagram of the central block of the present invention;

[0039] Figure 4It is a schematic cross-sectional structural diagram of the combination block of the present invention;

[0040] Figure 5 It is a structural schematic diagram of the combination block of the present invention;

[0041] Figure 6 Schematic diagram of the structure of the connection assembly of the present invention;

[0042] Figure 7 for Figure 6 A magnified view of point A;

[0043] Figure 8 This is a schematic structural diagram of the rotating handle of the present invention;

[0044] Figure 9 Schematic diagram of part of the structure of the present invention Figure 2 .

[0045] The markings in the figure are as follows:

[0046] 100. Support assembly;

[0047] 110, center block; 111, jack;

[0048] 120, connection module; 121, assembly block; 122, plug-in block; 123, fixing hole; 130, insertion hole; 140, clamping space;

[0049] 200, fixed components;

[0050] 210, cover plate;

[0051] 220, locking member; 221, rotating handle; 222, polygonal locking block;

[0052] 223, card slot;

[0053] 230, anchor cable;

[0054] 240, anchor rod; 241, first threaded portion; 242, second threaded portion;

[0055] 300, connection components;

[0056] 310, connecting portion; 320, long rod; 330, telescopic rod; 340, damping plate; 350, sliding space;

[0057] 400, casting assembly; 410, U-shaped piece. DETAILED DESCRIPTION

[0058] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0059] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated, such as up, down, front, back, left, and right, are based on the directions or positional relationships shown in the accompanying drawings and are only intended to indicate or imply relative importance or to implicitly indicate the number of the indicated technical features or to implicitly indicate the sequence of the indicated technical features.

[0060] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0061] Combine Figures 1 to 9 As shown, one embodiment of the present invention provides a foundation pit supporting device, comprising:

[0062] Support assembly 100;

[0063] A fixing assembly 200, wherein the fixing assembly 200 is mounted on the supporting assembly 100;

[0064] A connecting assembly 300, the connecting assembly 300 being mounted on the supporting assembly 100;

[0065] A casting assembly 400, wherein the casting assembly 400 is installed on the supporting assembly 100;

[0066] The support assembly 100 includes a central block 110 and a plurality of connection modules 120 , wherein the plurality of connection modules 120 are mounted on the central block 110 ;

[0067] The fixing assembly 200 includes a cover plate 210, a locking member 220, an anchor cable 230, and an anchor rod 240. The cover plate 210 is mounted on the support assembly 100. The locking member 220 is located on a side of the cover plate 210 away from the support assembly 100. The anchor cable 230 passes through the support assembly 100 and the cover plate 210 and is threadedly connected to the locking member 220. The anchor rod 240 is threadedly connected to an end of the anchor cable 230 away from the locking member 220.

[0068] The connection assembly 300 is used to connect the support assembly 100 to another support assembly 100 , and the casting assembly 400 is used to install the support assembly 100 with another support assembly 100 .

[0069] The present invention relates to a foundation pit support device. The socket 111 on the central block 110 is used to cooperate with the connection module 120 for connection. The combination block 121 is connected to the central block 110 through the plug block 122. After the four combination blocks 121 are linked, the splicing of the anchor pier can be completed, which is convenient for construction personnel to carry. Therefore, there is no need for the hoisting and fixing of the one-piece molding as in the prior art, and it can be assembled on site. The fixing hole 123 is used to complete the fixation of the combination block 121 by inserting the anchor cable 230, and the limit of the combination block 121 is completed. The anchor cable 230 is threadedly connected to the anchor rod 240, so that the anchor rod 240 is pushed forward by twisting the rotating handle 221 through an external instrument. Through the first threaded portion 241, the large pitch can be quickly screwed into the loose soil layer, the screwing speed is improved, and the large gap The thread absorbs high-frequency vibration energy through the second threaded portion 242, and the small pitch allows for a dense bite to the clay or rock layer, increasing the contact area by 2 times. The small-gap thread suppresses low-frequency displacement. The U-shaped part 410 is used to directly pour the pouring slurry into the U-shaped part 410 during pouring, and directly form it, which is convenient and fast. The connecting part 310 is used to be clamped in the insertion hole 130, and then the length of the telescopic rod 330 is adjusted to facilitate connection with the insertion hole 130 on another support device. It is rotated through another connecting part 310 and thus clamped in the clamping space 140. The damping plate 340 can directly fix the telescopic rod 330 without adjusting the telescopic rod 330 to increase resistance. After the pouring is completed, the connecting component 300 is equivalent to a reinforcing rib.

[0070] In one embodiment, the connecting assembly 300 includes a connecting portion 310 , a long rod 320 , a telescopic rod 330 and a damping sheet 340 ;

[0071] The connecting portion 310 is mounted on the supporting assembly 100 , and the supporting assembly 100 is provided with an insertion hole 130 that is adapted to the size of the connecting portion 310 ;

[0072] The support assembly 100 is provided with a clamping space 140 , the clamping space 140 is communicated with the insertion hole 130 , and the connecting portion 310 is located in the clamping space 140 ;

[0073] The long rod 320 is fixedly arranged on a side of the connecting portion 310 away from the supporting assembly 100;

[0074] The telescopic rod 330 is sleeved on the end of the long rod 320 away from the connecting portion 310;

[0075] The damping plate 340 is symmetrically mounted on the inner wall of the telescopic rod 330 . A sliding space 350 is formed between the telescopic rod 330 and the long rod 320 . The damping plate 340 is located in the sliding space 350 .

[0076] The damping plate 340 is in a curved arc shape.

[0077] In this embodiment of the present invention, the connecting portion 310, serving as the core carrier of the connecting assembly 300, is typically secured to the support assembly 100 via bolts or snaps. Its internally designed latching space 140 forms a nested structure with the insertion hole 130, ensuring rapid alignment of adjacent support units while maintaining initial positioning accuracy. Once inserted into the insertion hole 130 of the support assembly 100, the connecting portion 310 is locked in place by the engagement of a built-in latch and an annular groove.

[0078] It should be noted that when the support system is subjected to stress, the connector 310 converts the horizontal earth pressure between adjacent support units into an axial force on the internal components. Actual measurement data shows that the connector 310 made of forged steel can reduce the stress concentration factor by more than 30%, effectively avoiding local plastic deformation.

[0079] The long rod 320, as an extension of the connecting portion 310, is typically made of high-strength alloy steel pipe (such as Q355B), but this is not a specific limitation. Its length is adjustable from 1.5 to 3 meters depending on the depth of the foundation pit. In the stress analysis, the long rod 320 primarily bears the combined loads of bending moment and pressure.

[0080] The long rod 320 is polished to form a precise fit with the telescopic rod 330. The axially arranged strip groove limits the rotational freedom of the telescopic rod 330 through the slider, ensuring that the telescopic rod 330 moves only in a straight line during telescopic adjustment.

[0081] A curved arc-shaped damping sheet 340 (6-8mm thick) made of butyl rubber composite material can attenuate the amplitude of construction vibration through the combined effect of Coulomb friction and viscous damping;

[0082] The damping plates 340 are symmetrically arranged on the inner wall of the telescopic rod 330 to form a multi-level buffer layer:

[0083] Primary cushioning: absorbs instantaneous impact through elastic deformation;

[0084] Secondary dissipation: converting mechanical energy into heat energy;

[0085] Reset and hold: Spring steel sheets ensure that the components return to their original positions after vibration stops.

[0086] In one embodiment, the casting assembly 400 includes a plurality of U-shaped members 410 , and the plurality of U-shaped members 410 are clamped on the supporting assembly 100 ;

[0087] The U-shaped member 410 is used for casting so that the support assembly 100 is connected to another anchor pier.

[0088] In an embodiment of the present invention, the U-shaped casting component 400 is directly clamped to the anchor pier, eliminating the traditional stirrup binding step, and forming an integrated connecting beam after casting, thereby improving the crack resistance. The connecting component 300 is combined with the concrete during casting, thereby enhancing the integrity of the connecting beam and avoiding the positioning deviation problem of the reserved steel bars.

[0089] In one embodiment, the connection module 120 includes a combination block 121 and an insert block 122 , and the central block 110 is provided with jacks 111 whose number matches the number of the insert blocks 122 ;

[0090] The insert block 122 is located in the insert hole 111 , and the assembly block 121 is clamped on the central block 110 through the insert block 122 ;

[0091] The insert block 122 is provided with a fixing hole 123;

[0092] The heights of the insertion holes 111 on the central block 110 are not located at the same level;

[0093] The central axes of the fixing holes 123 on each of the insert blocks 122 coincide with each other, and each of the fixing holes 123 is sleeved around the outer periphery of the anchor cable 230 , and the assembly block 121 is fixedly connected to the central block 110 via the anchor cable 230 .

[0094] In the embodiment of the present invention, as the core load-bearing unit of the support system, the combined block 121 is connected to the central block 110 through the plug block 122 to form an expandable support surface, which is usually equipped with a steel mesh or stiffening ribs to directly bear the soil pressure and transfer it to the anchor system;

[0095] By increasing or decreasing the number of combination blocks 121, the side walls of the foundation pit of different widths can be adapted to reduce customization costs. The plug block 122 serves as the mechanical interface between the combination block 121 and the center block 110, and adopts a T-shaped or dovetail cross-section. No excessive restrictions are made here. After being inserted into the center block 110 socket 111, a geometric constraint is formed. The center block 110 serves as the reference part for connecting the module 120. The anchor cable 230 channel is embedded inside it, and the socket 111 adopts an asymmetric height design. The hole wall of the socket 111 is provided with an anti-slip chamfer. The fixing hole 123 passes through the center of the plug block 122. The anchor cable 230 passes through the fixing hole 123 to form a continuous stress reinforcement, which transfers the load of the combination block 121 to the anchor end. The anchor cable 230 adopts 1860MPa grade steel strand. After passing through the coaxial fixing hole 123, the two ends are tensioned and locked. The temporary support is completed by the first tensioning, and the tensioning is supplemented after the secondary excavation.

[0096] When the lateral earth pressure of the foundation pit increases, the system response process is as follows:

[0097] 1. Load transfer: soil pressure → combined block 121 → plug block 122 → center block 110 plug hole 111 wall → anchor cable 230 prestressed system;

[0098] 2. Deformation suppression: The friction between the plug block 122 and the socket 111 dissipates energy, and stress redistribution is triggered when the elongation of the anchor cable 230 is ≤0.1%;

[0099] 3. Safety redundancy: Even if a single plug-in block 122 fails, the adjacent combined blocks 121 form a load transfer path through the central block 110, and the system load-bearing capacity only decreases by 15%.

[0100] It should be noted that the connection module 120 has the dual effects of mechanical engagement between the plug block 122 and the socket 111 and coaxial consolidation of the anchor cable 230. Manual assembly replaces lifting and welding, and is suitable for narrow spaces such as pipeline corridor reconstruction. The asymmetric socket 111 design forms a passive anti-torsion mechanism.

[0101] In one embodiment, the locking member 220 is provided with a rotating handle 221, and the rotating handle 221 is provided with a polygonal clamping block 222. The locking member 220 is provided with a clamping groove 223 that is adapted to the shape of the polygonal clamping block 222, and the rotating handle 221 is set on the locking member 220 through the polygonal clamping block 222.

[0102] In this embodiment of the present invention, the locking member 220 uses mechanical locking instead of traditional grouting anchoring, and works in conjunction with the anchor cable 230 through a threaded structure. After the initial tensioning, the prestress is locked. During the secondary excavation, additional tensioning can be used to compensate for soil creep stress loss, giving the support system dynamic adaptability and effectively eliminating the waiting time for the initial setting of the grouting.

[0103] The rotating handle 221 is typically designed to be 300–400 mm long, consistent with the reach of human arms. Its knurled surface enhances grip stability, allowing a single person to apply 120 N·m of torque, eliminating the need for heavy equipment such as hydraulic wrenches. The above description only applies to manual rotation during initial soil entry; subsequent rotation and propulsion via external mechanical equipment is still required, as explained here.

[0104] The locking block adopts a regular hexagonal or regular octagonal structure (tolerance of opposite sides ±0.05mm), forming surface contact rather than point contact with the locking groove 223. Finite element analysis shows that this design reduces the stress concentration coefficient from 2.8 of the traditional square tenon to 1.3, avoiding failure caused by local plastic deformation during the locking process. The angle between the polygonal edge and the wall of the locking groove 223 is designed to be 120° (hexagonal) or 135° (octagonal), so that the torque transmission efficiency reaches more than 95% (traditional keyway structure is about 80%). Actual measurements show that the rated torque can still be stably output under frozen soil conditions;

[0105] The depth of the locking groove 223 is 1.5 times the height of the locking block (for example, a 15mm deep groove matches a 10mm locking block), and the groove wall is set with a 0.5° micro-cone angle to produce a self-tightening effect when locking.

[0106] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the paper document and the contents of the drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A foundation pit support device, characterized in that: include: Support assembly (100); a fixing assembly (200), the fixing assembly (200) being mounted on the supporting assembly (100); a connecting assembly (300), the connecting assembly (300) being mounted on the supporting assembly (100); A casting assembly (400), the casting assembly (400) being mounted on the supporting assembly (100); The support assembly (100) comprises a central block (110) and a plurality of connection modules (120), wherein the plurality of connection modules (120) are mounted on the central block (110); The fixing assembly (200) comprises a cover plate (210), a locking member (220), an anchor cable (230) and an anchor rod (240); the cover plate (210) is mounted on the support assembly (100); the locking member (220) is located on a side of the cover plate (210) away from the support assembly (100); the anchor cable (230) passes through the support assembly (100) and the cover plate (210) and is threadedly connected to the locking member (220); the anchor rod (240) is threadedly connected to an end of the anchor cable (230) away from the locking member (220); a first threaded portion (241) and a second threaded portion (242) are provided on the anchor rod (240); the pitch of the first threaded portion (241) is greater than the pitch of the second threaded portion (242); The connection assembly (300) is used for connecting the support assembly (100) to another support assembly (100), and the casting assembly (400) is used for installing the support assembly (100) and another support assembly (100).

2. A foundation pit supporting device according to claim 1, characterized in that: The connecting assembly (300) comprises a connecting portion (310), a long rod (320), a telescopic rod (330) and a damping plate (340); The connecting portion (310) is mounted on the supporting assembly (100), and the supporting assembly (100) is provided with an insertion hole (130) that is adapted in size to the connecting portion (310); The support assembly (100) is provided with a clamping space (140), the clamping space (140) is communicated with the insertion hole (130), and the connecting portion (310) is located in the clamping space (140).

3. A foundation pit supporting device according to claim 2, characterized in that: The long rod (320) is fixedly arranged on a side of the connecting portion (310) away from the supporting assembly (100).

4. A foundation pit supporting device according to claim 2, characterized in that: The telescopic rod (330) is sleeved on an end of the long rod (320) away from the connecting portion (310).

5. The foundation pit supporting device according to claim 2, characterized in that: The damping plate (340) is symmetrically mounted on the inner wall of the telescopic rod (330), a sliding space (350) is formed between the telescopic rod (330) and the long rod (320), and the damping plate (340) is located in the sliding space (350); The damping plate (340) is in a curved arc shape.

6. The foundation pit supporting device according to claim 1, characterized in that: The casting assembly (400) includes a plurality of U-shaped pieces (410), and the plurality of U-shaped pieces (410) are clamped on the supporting assembly (100); The U-shaped member (410) is used for casting so that the support assembly (100) is connected to another anchor pier.

7. The foundation pit supporting device according to claim 1, characterized in that: The connection module (120) includes a combination block (121) and an insert block (122), and the central block (110) is provided with jacks (111) whose number matches the number of the insert blocks (122); The insert block (122) is located in the insert hole (111), and the assembly block (121) is clamped on the center block (110) through the insert block (122); The insert block (122) is provided with a fixing hole (123); The heights of the insertion holes (111) on the central block (110) are not located at the same level.

8. The foundation pit supporting device according to claim 7, characterized in that: The central axes of the fixing holes (123) on each of the insert blocks (122) coincide with each other, and each of the fixing holes (123) is sleeved around the periphery of the anchor cable (230), and the assembly block (121) is fixedly connected to the central block (110) via the anchor cable (230).

9. The foundation pit supporting device according to claim 1, characterized in that: The locking member (220) is provided with a rotating handle (221), and the rotating handle (221) is provided with a polygonal locking block (222).

10. The foundation pit supporting device according to claim 1, characterized in that: The locking member (220) is provided with a locking groove (223) that matches the shape of the polygonal locking block (222), and the rotating handle (221) is arranged on the locking member (220) through the polygonal locking block (222).

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