CN114164838A - Strutting arrangement for foundation ditch - Google Patents
Strutting arrangement for foundation ditch Download PDFInfo
- Publication number
- CN114164838A CN114164838A CN202111488440.2A CN202111488440A CN114164838A CN 114164838 A CN114164838 A CN 114164838A CN 202111488440 A CN202111488440 A CN 202111488440A CN 114164838 A CN114164838 A CN 114164838A
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- foundation pit
- assembly
- elastic
- pushing
- supporting block
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/14—Geometrical or physical properties resilient or elastic
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/16—Shapes
- E02D2200/1671—Shapes helical or spiral
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
- E02D2300/0034—Steel; Iron in wire form
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
The invention relates to a supporting device for a foundation pit, which comprises a shaft lever and an elastic supporting mechanism, wherein the elastic supporting mechanism comprises an olive-shaped pushing elastic assembly, a supporting block fixed with the end part of the pushing elastic assembly and a pressing assembly for applying force on the pushing elastic assembly to enable the supporting block to push the side surface of the foundation pit; the pressing assembly comprises a chest expander and a steel rope, the steel rope is wound on the outer wall of the pushing elastic assembly, one end of the steel rope is fixed on one end of the pushing elastic assembly, the other end of the steel rope is inserted on the chest expander in a penetrating manner, and the chest expander is fixed on the other end of the pushing elastic assembly; the invention has the advantages that the pre-applied axial force can be adjusted by a single support at any time and any place, the axial force value is accurately and reliably adjusted, the force applied at each support position is balanced, and the function of a support system can be exerted to the maximum extent.
Description
Technical Field
The invention belongs to the technical field of civil engineering and urban rail transit building construction, and particularly relates to a supporting device for a foundation pit.
Background
With the rapid development of the national infrastructure construction, the projects of urban high-rise buildings, rail transit underground stations and the like emerge endlessly; the construction of the buildings is characterized in that a foundation pit enclosure structure with a certain depth needs to be constructed and excavated so as to facilitate the construction of underground structures; because the depth of the foundation pit is usually between tens of meters and tens of meters, in order to ensure the stability of the stratum during foundation pit excavation, a foundation pit enclosure structure such as an underground continuous wall or a cast-in-situ bored pile is usually arranged, a crown beam and a concrete support structure are arranged at the top of the enclosure structure, and one to several layers of steel or concrete support structures are arranged in the foundation pit; for the excavation construction of the foundation pit of the subway station, the number of the steel support structures occupies the absolute leading position of the support structures, so that the rapid installation of the steel supports and the timely and effective application of the supporting force are one of the important factors for ensuring the construction stability of the whole foundation pit.
The prior foundation pit support and bracing system usually comprises an underground continuous wall or a retaining pile arranged along the peripheral edge of a foundation pit and an foundation pit inner support arranged between a crown beam or a purlin beam; the foundation pit inner support usually comprises a steel structure support part with a movable end of a movable joint, and the steel structure support part exerts pre-applied axial force on the axial line position of the movable end through a jack arranged in the movable joint so as to form a support guarantee system for the foundation pit and control the deformation of the foundation pit. The steel structure supporting member in the prior art can not adjust and add the pre-applied axial force according to the designed axial force value at any time along with the change of the excavation working condition process of the foundation pit, and the change value of the pre-applied axial force of each supporting position is not balanced, so the whole stress performance of a supporting system in the excavation process of the foundation pit can not completely reach the technical level required by the standard, and the risk of overlarge deformation of a support structure and local foundation pit collapse caused by the excavation of the foundation pit is easily caused.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a supporting device for a foundation pit, which is suitable for the foundation pit of an underground station of urban rail transit, and has the advantages that the pre-applied axial force can be adjusted by a single support anytime and anywhere, the axial force can be accurately and reliably adjusted, the axial force applied at each supporting position is well balanced, and the effect of a supporting system can be exerted to the maximum extent.
The supporting device for the foundation pit comprises a shaft rod and an elastic supporting mechanism, wherein the elastic supporting mechanism comprises an olive-shaped pushing elastic assembly, a supporting block fixed to the end of the pushing elastic assembly and a pressing assembly for applying force to the pushing elastic assembly to enable the supporting block to push the side face of the foundation pit, the shaft rod is arranged along the central axis of the pushing elastic assembly, and two ends of the shaft rod are connected to the supporting block and the end of the pushing elastic assembly through pulley assemblies respectively; the pressing assembly comprises a spring exerciser and a steel rope, the steel rope is wound on the outer wall of the pushing elastic assembly, one end of the steel rope is fixed to one end of the pushing elastic assembly, the other end of the steel rope is inserted into the spring exerciser in a penetrating mode, and the spring exerciser is fixed to the other end of the pushing elastic assembly.
According to the invention, the olive-shaped pushing elastic assembly is arranged, the steel rope is pulled to further compress the pressing assembly and compress the pushing elastic assembly to the radial side of the shaft lever, so that the pushing elastic assembly slides along the axial direction of the shaft lever and through the pulley assembly, and the supporting block pushes the side surface of the foundation pit, thereby forming a support for the foundation pit and ensuring the safety of foundation pit excavation; and through the cooperation of the chest expander and the steel rope, in the process of continuously excavating the foundation pit, the supporting device can timely and accurately achieve the best joint support between the underground continuous walls or the surrounding purlin beams opposite to two sides, thereby effectively improving the action efficiency of the support in the foundation pit.
Preferably, the pushing elastic assembly comprises a plurality of arched elastic steel sheets and fixing rings, the arched elastic steel sheets are arranged on the outer side of the shaft rod, two ends of each arched elastic steel sheet are respectively fixed on the two fixing rings, and the two fixing rings are respectively sleeved on two end parts of the shaft rod; through the arrangement of the arched elastic steel sheet, the pushing elastic assembly is more rapid and convenient in the processes of compression, resetting and propping along two sides of the shaft lever.
Preferably, the arched elastic steel sheets are annularly arranged around the axial outer side of the shaft rod, and the adjacent arched elastic steel sheets are distributed at equal intervals; through the distribution of the arched elastic steel sheets, the pressing force and the spreading force are more stable in the processes of compressing and resetting the pushing elastic assembly and spreading the pushing elastic assembly along the two sides of the shaft rod, so that the supporting device is higher in adjusting accuracy and better in force application balance in the process of jointing, supporting and adjusting the supporting device with the foundation pit.
Preferably, the center of the supporting block is provided with a through hole, the supporting block is sleeved on the end part of the shaft lever by using a pulley assembly through the through hole, and the supporting block is respectively provided with one block at two ends of the shaft lever and is respectively fixed on the fixing rings; make the supporting shoe can be spacing in the footpath of axostylus axostyle radially like this to ensure that the supporting shoe can slide and can be fine with the underground continuous wall of foundation ditch or enclose the laminating support of purlin roof beam along the axostylus axostyle direction.
Preferably, the steel rope is spirally wound on the outer sides of the plurality of arc-shaped elastic steel sheets, and the pitch of the steel rope wound on the two ends of each arc-shaped elastic steel sheet is greater than that of the steel rope wound on the middle section of each arc-shaped elastic steel sheet; therefore, when the steel rope is tensioned and the arched elastic steel sheet is compressed towards the radial side of the shaft lever, the force application is more convenient, and the arched elastic steel sheet is compressed and deformed more quickly.
Preferably, a groove for sliding the steel rope along the length direction of the arched elastic steel sheet is arranged on the surface of the arched elastic steel sheet contacted with the steel rope; therefore, the steel rope can always slide in the groove and is not easy to slip in the tensioning or loosening process, and a layer of lubricating oil is coated in the groove, so that the friction between the steel rope and the groove can be greatly reduced.
Preferably, the ratio of the rise H to the elongation L of the pushing elastic component is (10-12): 1, and the displacement in the pushing direction of the pushing elastic component can be ensured through the matching of the spring exerciser and the steel rope and the proportional relation.
Preferably, the pulley assembly comprises a first pulley assembly and a second pulley assembly, the first pulley assembly is arranged between the shaft lever and the supporting block, and the second pulley assembly is arranged between the shaft lever and the end of the pushing elastic assembly; therefore, the supporting block and the pushing elastic component can smoothly slide on the shaft rod in the process of expanding or resetting the pushing elastic component.
Preferably, the first pulley assembly comprises a bearing wheel and a sliding groove arranged in the support block, the bearing wheel is provided with a plurality of mounting grooves which are connected in the shaft lever, fixed at two ends of the shaft lever and distributed at equal intervals along the circumferential direction of the shaft lever, the mounting grooves and the sliding groove are distributed in a one-to-one correspondence manner, and the outer diameter surface of the bearing wheel is in contact with the sliding groove; therefore, the supporting block can smoothly slide along the axial direction of the shaft lever, so that the adjustment is more timely and the force application balance is better.
Preferably, the second pulley assembly comprises a plurality of pulleys and a plurality of sliding groove blocks, the pulleys are connected to the inner wall of the end part of the pushing elastic assembly through a support and are distributed at equal intervals, the sliding groove blocks are arranged on the circumferential wall of the shaft rod and are distributed at equal intervals, and the pulleys and the sliding groove blocks are distributed in a one-to-one correspondence manner; therefore, the end part of the pushing elastic component can smoothly slide along the axial direction of the shaft rod, so that the adjustment is more timely and the force application balance is better.
Drawings
Fig. 1 is a schematic perspective view of the supporting device of the present invention.
Fig. 2 is an enlarged schematic view of a portion a of fig. 1.
Fig. 3 is an enlarged schematic view of fig. 1 at B.
The reference numbers in the drawings are respectively: 1. a shaft lever; 2. an elastic support mechanism; 3. a support block; 4. a compression assembly; 5. a pushing elastic component; 6. a sheave assembly; 31. a through hole; 41. a chest expander; 42. a steel cord; 51. an arcuate resilient steel sheet; 52. a fixing ring; 53. a groove; 61. a first sheave assembly; 62. a second sheave assembly; 61-1, a bearing wheel; 61-2, a chute; 61-3, mounting grooves; 62-1, a pulley; 62-2, a sliding groove block; 62-3 and a bracket.
Detailed Description
The invention will be described in detail below with reference to the following drawings: as shown in fig. 1, the invention comprises a shaft lever 1 and an elastic supporting mechanism 2, wherein the elastic supporting mechanism 2 comprises an olive-shaped pushing elastic component 5, a supporting block 3 fixed with the end part of the pushing elastic component 5, a pressing component 4 for applying force on the pushing elastic component 5 to push the supporting block 3 to the side surface of the foundation pit, and the olive-shaped pushing elastic component 5, so that the pushing elastic component 5 can be conveniently opened and reset, and the force application balance of the pushing elastic component 5 in the opening process can be better; the shaft lever 1 is arranged along the central axis of the pushing elastic component 5, and two ends of the shaft lever 1 are respectively connected to the supporting block 3 and the end part of the pushing elastic component 5 through the pulley component 6; the pressing component 4 comprises a spring exerciser 41 and a steel rope 42, the spring exerciser 41 adopts a center-penetrating jack, the steel rope 42 is wound on the outer wall of the pushing elastic component 5, one end of the steel rope 42 is fixed on one end of the pushing elastic component 5, namely fixed on the fixed ring 52, the other end of the steel rope 42 is inserted on the spring exerciser 41, and the spring exerciser 41 is fixed on the other end of the pushing elastic component 5, namely fixed on the end part of the arched elastic steel sheet; the olive-shaped pushing elastic assembly is arranged, and the pushing elastic assembly is compressed towards the radial side of the shaft lever through the pressing assembly, so that the pushing elastic assembly slides along the axial direction of the shaft lever and through the pulley assembly, the supporting block pushes towards the side surface of the foundation pit, the support for the foundation pit is formed, and the safety of foundation pit excavation is guaranteed; and through the cooperation of chest expander and steel cable, at the continuous excavation in-process of foundation ditch, strutting arrangement can be timely and accurate with the underground continuous wall or enclose between the purlin roof beam of relative both sides laminating support to the overall stability of support in the effectual improvement foundation ditch has the advantage that the regulation is timely, the regulation degree of accuracy is high and the application of force equilibrium is good.
The pushing elastic assembly 5 comprises eight arc-shaped elastic steel sheets 51 and a fixing ring 52, the arc-shaped elastic steel sheets 51 are arranged in a surrounding manner along the axial outer side of the shaft lever 1, and the adjacent arc-shaped elastic steel sheets 51 are distributed at equal intervals; the two ends of the arched elastic steel sheets 51 are respectively fixed on the two fixing rings 52, the fixing rings 52 are octagonal, each arched elastic steel sheet 51 is respectively fixed on one side of the fixing ring 52 in a welding mode, the two fixing rings 52 are respectively sleeved on the two ends of the shaft lever 1, and radial limiting is realized through the second pulley assembly 62; through the distribution of the arched elastic steel sheets, the pressing force and the spreading force are more stable in the processes of compressing and resetting the pushing elastic assembly and spreading the pushing elastic assembly along the two sides of the shaft rod, so that the supporting device is higher in adjusting accuracy and better in force application balance in the process of jointing, supporting and adjusting the supporting device with the foundation pit.
The center of the supporting block 3 is provided with a through hole 31, the supporting block 3 is sleeved on the end part of the shaft lever 1 by utilizing the pulley component 6 through the through hole 31, the supporting block 3 is respectively provided with one block at two ends of the shaft lever 1 and respectively fixed on the fixing ring 52, the supporting block 3 is used for tightly pushing the side surface of the foundation pit, the supporting block 3 slides by the propping of the pushing elastic component 5, and the displacement of the two supporting blocks 3 along the propping state of the shaft lever 1 is 5-6 cm, so the enclosing deformation of the foundation pit is larger sometimes, the displacement probably cannot reach the supporting function of the underground continuous wall or the enclosing purlin beam of the foundation pit, namely the supporting block 3 and the underground continuous wall or the enclosing purlin beam of the foundation pit cannot be tightly pushed, then, one supporting block can be fixed on one side of the supporting block 3 or the existing supporting block 3 can be thickened, and the force can be applied more flexibly through the matching between the supporting block 3 and the shaft lever 1, the method is more suitable for excavation deformed foundation pits of different supporting structures.
The steel rope 42 is spirally wound on the outer sides of the plurality of arc-shaped elastic steel sheets 51, the pitch of the steel rope wound at two ends of each arc-shaped elastic steel sheet 51 is larger than that of the steel rope wound at the middle section of each arc-shaped elastic steel sheet 51, namely the ratio of the pitch of the steel rope wound at two ends to the pitch of the steel rope wound at the middle section is 2: 1, the steel rope 42 is wound on each arc-shaped elastic steel sheet 51 and is divided into three equally-divided sections, when the steel rope 42 is tensioned and the arc-shaped elastic steel sheets 51 are compressed towards the radial side of the shaft rod, tensioning force application of the steel rope is ensured to be more convenient, so that the arc-shaped elastic steel sheets 51 at two ends are compressed and deformed more quickly, the stress of the arc-shaped elastic steel sheets 51 at two ends is more uniform, and deformation of the arc-shaped elastic steel sheets 51 is avoided.
The surface of the arc-shaped elastic steel sheet 51 contacted with the steel rope 42 is provided with a groove 53 for the steel rope 42 to slide along the length direction of the arc-shaped elastic steel sheet 51, as shown in figure 3, the width of the groove 53 is 8-12 cm, so that the steel rope can always slide in the groove and is not easy to slip in the tensioning or loosening process of the steel rope, namely, the pushing elastic component is in a pressing state or a resetting state, and a layer of lubricating oil is coated in the groove, so that the friction force between the steel rope and the groove can be greatly reduced.
The ratio of the rise H to the elongation L of the ejection elastic component 5 is (10-12): 1, and the elongation L is the ejection displacement; through the cooperation of the spring 41 and the steel cable 42, the displacement of the pushing elastic component 5 in the spreading direction can be ensured through the proportional relationship.
As shown in fig. 1 and 2, the pulley assembly 6 includes a first pulley assembly 61 and a second pulley assembly 62, the first pulley assembly 61 is disposed between the shaft 1 and the supporting block 3, and the second pulley assembly 62 is disposed between the shaft 1 and the end of the pushing elastic assembly 5.
The first pulley component 61 comprises a bearing wheel 61-1 and a sliding groove 61-2 arranged in the supporting block 3, the bearing wheel 61-1 is provided with four mounting grooves 61-3 which are respectively connected in the shaft lever 1 in a manner of compression and reset, the four mounting grooves 61-3 are fixed at two ends of the shaft lever 1 and are distributed at equal intervals along the circumferential direction of the shaft lever 1, the mounting grooves 61-3 and the sliding groove 61-2 are distributed in a one-to-one correspondence manner, the outer diameter surface of the bearing wheel 61-1 is in contact with the sliding groove 61-2, the bearing wheel 61-1 is positioned in the sliding groove 61-2 and the sliding groove 61-2 is 4-8 cm in length through the matching of the sliding groove 61-2 and the mounting groove 61-3; the second pulley assembly 62 comprises eight pulleys 62-1 and a sliding groove block 62-2, the eight pulleys 62-1 are connected to the inner wall of the octagonal fixing ring 52 through a support 62-3 and are distributed at equal intervals, the support 62-3 has a compression reset function, the eight sliding groove blocks 62-2 are arranged on the circumferential wall of the shaft rod 1 and are distributed at equal intervals, the pulleys 62-1 and the sliding groove block 62-2 are distributed in a one-to-one correspondence manner, the radial end face of the pulley 62-1 is abutted to the sliding groove block 62-2, and the length of a sliding groove on the sliding groove block 62-2 is 4-8 cm; therefore, in the expanding or resetting process of the pushing elastic component, the supporting block and the pushing elastic component can smoothly slide on the shaft rod, so that the adjustment is more timely and the force application balance is better.
The working principle of the invention is as follows: when strutting arrangement and the contact of foundation ditch side not tight and make the foundation ditch wall body warp, at this moment, through chest expander 41 with steel cable 42 taut for bow-shaped elastic steel piece 51 is to the radial compression of axostylus axostyle 1, and rise H constantly reduces promptly, and then bow-shaped elastic steel piece 51 struts to both sides along the axial of axostylus axostyle 1, and the elongation constantly increases promptly, makes supporting shoe 3 and foundation ditch side in close contact with stop the deformation of wall body.
The present invention is not limited to the above embodiments, and any changes in the shape or material composition, or any changes in the structural design provided by the present invention, are all modifications of the present invention, and should be considered to be within the scope of the present invention.
Claims (10)
1. The utility model provides a strutting arrangement for foundation ditch, includes axostylus axostyle (1), elastic support mechanism (2), its characterized in that: the elastic supporting mechanism (2) comprises an olive-shaped pushing elastic component (5), a supporting block (3) fixed to the end of the pushing elastic component (5) and a pressing component (4) used for applying force on the pushing elastic component (5) to enable the supporting block (3) to push towards the side face of the foundation pit, the shaft rod (1) is arranged along the central axis of the pushing elastic component (5), and two ends of the shaft rod (1) are connected to the supporting block (3) and the end of the pushing elastic component (5) through pulley components (6) respectively; the pressing assembly (4) comprises a chest expander (41) and a steel rope (42), the steel rope (42) is wound on the outer wall of the pushing elastic assembly (5), one end of the steel rope (42) is fixed to one end of the pushing elastic assembly (5), the other end of the steel rope (42) is inserted into the chest expander (41), and the chest expander (41) is fixed to the other end of the pushing elastic assembly (5).
2. The support device for the foundation pit according to claim 1, wherein: the pushing elastic assembly (5) comprises a plurality of arched elastic steel sheets (51) and fixing rings (52), the arched elastic steel sheets (51) are arranged on the outer side of the shaft rod (1), two ends of each arched elastic steel sheet (51) are fixed to the two fixing rings (52), and the two fixing rings (52) are sleeved on two ends of the shaft rod (1) respectively.
3. The support device for the foundation pit according to claim 2, wherein: the arched elastic steel sheets (51) are arranged around the axial outer side of the shaft lever (1) in an annular mode, and the adjacent arched elastic steel sheets (51) are distributed at equal intervals.
4. The support device for the foundation pit according to claim 2, wherein: the center of the supporting block (3) is provided with a through hole (31), the supporting block (3) is sleeved on the end part of the shaft lever (1) through the through hole (31) by utilizing a pulley assembly (6), and the supporting block (3) is respectively provided with one block at two ends of the shaft lever (1) and is respectively fixed on a fixing ring (52).
5. The support device for the foundation pit according to claim 2, wherein: the steel ropes (42) are spirally wound on the outer sides of the plurality of arched elastic steel sheets (51), and the pitch of the steel ropes wound at the two ends of the arched elastic steel sheets (51) is larger than that of the steel ropes wound at the middle section of the arched elastic steel sheets (51).
6. The support device for the foundation pit according to claim 5, wherein: and a groove (53) for the steel rope (42) to slide along the length direction of the arched elastic steel sheet (51) is arranged on the surface of the arched elastic steel sheet (51) contacted with the steel rope (42).
7. The support device for the foundation pit according to claim 2, wherein: the ratio of the rise H to the elongation of the ejection elastic component (5) is (10-12): 1.
8. The support device for the foundation pit according to claim 1, wherein: the pulley assembly (6) comprises a first pulley assembly (61) and a second pulley assembly (62), the first pulley assembly (61) is arranged between the shaft lever (1) and the supporting block (3), and the second pulley assembly (62) is arranged between the shaft lever (1) and the end part of the pushing elastic assembly (5).
9. The support device for the foundation pit according to claim 8, wherein: the first pulley component (61) comprises a bearing wheel (61-1) and a sliding groove (61-2) arranged in the supporting block (3), the bearing wheel (61-1) is provided with a plurality of mounting grooves (61-3) connected to the shaft lever (1), the mounting grooves (61-3) are fixed at two ends of the shaft lever (1) and are distributed at equal intervals along the circumferential direction of the shaft lever (1), the mounting grooves (61-3) and the sliding groove (61-2) are distributed in a one-to-one corresponding mode, and the outer diameter surface of the bearing wheel (61-1) is in contact with the sliding groove (61-2).
10. The support device for the foundation pit according to claim 8, wherein: the second pulley component (62) comprises pulleys (62-1) and sliding groove blocks (62-2), the pulleys (62-1) are provided with a plurality of blocks and connected to the inner wall of the end part of the pushing elastic component (5) through supports (62-3) and distributed at equal intervals, the sliding groove blocks (62-2) are provided with a plurality of blocks and installed on the circumferential wall of the shaft rod (1) and distributed at equal intervals, and the pulleys (62-1) and the sliding groove blocks (62-2) are distributed in a one-to-one correspondence manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111488440.2A CN114164838B (en) | 2021-12-08 | 2021-12-08 | Supporting device for foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111488440.2A CN114164838B (en) | 2021-12-08 | 2021-12-08 | Supporting device for foundation pit |
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| CN114164838A true CN114164838A (en) | 2022-03-11 |
| CN114164838B CN114164838B (en) | 2023-05-23 |
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| CN114164838B (en) | 2023-05-23 |
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