CN114164839B - Foundation pit support device and construction method thereof - Google Patents
Foundation pit support device and construction method thereof Download PDFInfo
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- CN114164839B CN114164839B CN202111488460.XA CN202111488460A CN114164839B CN 114164839 B CN114164839 B CN 114164839B CN 202111488460 A CN202111488460 A CN 202111488460A CN 114164839 B CN114164839 B CN 114164839B
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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
- E02D2200/16—Shapes
- E02D2200/1607—Shapes round, e.g. circle
- E02D2200/1621—Shapes round, e.g. circle made from multiple elements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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- 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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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Abstract
The invention relates to a foundation pit enclosure device and a construction method thereof, wherein the foundation pit enclosure device comprises arch-shaped prefabricated walls, a foundation pit is formed by surrounding a plurality of arch-shaped prefabricated walls, adjacent arch-shaped prefabricated walls along the length or width direction of the foundation pit are fixedly connected through a first prefabricated connecting component, and adjacent arch-shaped prefabricated walls at the corners of the foundation pit are fixedly connected through a second prefabricated connecting component; the adjacent arched prefabricated walls in the height direction of the foundation pit are fixedly connected through a third prefabricated connecting component, a crown support is arranged on the upper end surface of the foundation pit through a first prefabricated connecting component and a second prefabricated connecting component, a plurality of inclined support components are arranged in the foundation pit through the first prefabricated connecting component and the second prefabricated connecting component, and a tension rope component is arranged on each arched prefabricated wall through the first prefabricated connecting component and/or the second prefabricated connecting component; the method is used for solving the risk of local induction of collapse of the foundation pit due to overlarge deformation of the enclosure structure during foundation pit excavation.
Description
Technical Field
The invention belongs to the technical field of civil engineering and urban rail transit building construction, and particularly relates to a foundation pit support device and a construction method thereof.
Background
At present, when underground space buildings such as subway stations and the like are constructed, foundation pit supporting structures are required to be arranged, generally, a planar underground continuous wall is adopted as an enclosure structure in a soft soil area, a crown support and a steel support are adopted as an inner support, and support is carried out firstly and then excavation is carried out; the supporting structure of the planar underground diaphragm wall and the inner support is utilized to resist the soil pressure and the water pressure generated by the soil outside the pit when the foundation pit is excavated, so that the vertical and horizontal deformation of the soil around the foundation pit is restrained, and the stability of the foundation pit is ensured. The prior art has the following disadvantages: (1) After the foundation pit in the soft soil area is excavated in a zoned and layered mode, the planar underground diaphragm wall can generate wall horizontal deformation under the action of active soil pressure of soil outside the pit when the steel support is not installed in time and is exposed in a support-free mode for applying prestress, and accordingly a state that the foundation pit is firstly deformed and then supported is unfavorable for stability is formed. (2) After the foundation pit is excavated, the planar underground diaphragm wall does not exert the soil arch effect, the received soil pressure is in a semi-infinite form, and the value is relatively large, so that the wall thickness is relatively large, the manufacturing cost is relatively high, and the deformation control effect is not very ideal.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a foundation pit support device suitable for an underground station foundation pit of urban rail transit and a construction method thereof, which are used for solving the problem that the support structure is excessively deformed and the collapse of the foundation pit is locally induced when the foundation pit is excavated.
The foundation pit enclosure device comprises arch-shaped prefabricated walls, a foundation pit is formed by surrounding a plurality of arch-shaped prefabricated walls, adjacent arch-shaped prefabricated walls along the length or width direction of the foundation pit are fixedly connected through a first prefabricated connecting component, and adjacent arch-shaped prefabricated walls at the corner of the foundation pit are fixedly connected through a second prefabricated connecting component; the adjacent arch prefabricated walls in the height direction of the foundation pit are fixedly connected through a third prefabricated connecting assembly, and a plurality of grouting pipes which are distributed at intervals in the height direction of the arch prefabricated walls and penetrate through the arch prefabricated walls are arranged; the upper end face of the foundation pit is provided with a crown support through a first prefabricated connecting component and a second prefabricated connecting component, a plurality of inclined support components are arranged in the foundation pit through the first prefabricated connecting component and the second prefabricated connecting component, and the inclined support components are staggered along the height direction of the foundation pit and are positioned below the crown support; and each arch-shaped prefabricated wall body is provided with a tension rope assembly through a first prefabricated connecting assembly and/or a second prefabricated connecting assembly.
The beneficial effects of the invention are as follows: by adopting the technical scheme, compared with the prior art, the foundation pit continuous wall is surrounded by arranging the arch-shaped prefabricated wall bodies and the prefabricated connecting assemblies, and the tension rope assemblies are arranged on each arch-shaped prefabricated wall body, so that the compression resistance of the arch-shaped prefabricated wall bodies is better, and meanwhile, the crown support and the inclined support assemblies are respectively arranged on the foundation pit continuous wall bodies, so that the deformation of the enclosure structure of the whole foundation pit continuous wall bodies can be timely and accurately pushed outwards towards the foundation pit continuous wall bodies through the inclined support assemblies when the foundation pit is excavated, and the risks of deformation and collapse of the foundation pit can be reduced.
Preferably, the first prefabricated connecting component comprises a wall section joint, U-shaped steel and a supporting groove, wherein the surface of the wall section joint facing the outer side of the foundation pit is a W-shaped surface, the U-shaped steel is provided with two parts and is respectively fixed on the W-shaped surfaces of the wall section joint, the arched prefabricated walls on two adjacent sides are connected together through the U-shaped steel, and a first welding rod is arranged on one end surface of the U-shaped steel along the height direction of the foundation pit; the three support grooves are respectively fixed on the surface of the wall section joint facing the inner side of the foundation pit, two of the support grooves are positioned on the end corners of the wall section joint, and the three support grooves are obliquely distributed along the height direction of the wall section joint; the two side surfaces of the wall section joint are respectively provided with a mounting hole for mounting a tension rope assembly, the plane of the mounting hole on the foundation pit and the plane of the supporting groove in the middle position of the three supporting grooves on the foundation pit are in the same plane, and a grouting pipe penetrating through the wall section joint along the height direction of the wall section joint is arranged in the wall section joint; by adopting the technical scheme, the installation connection between the adjacent arch prefabricated walls in the length direction or the width direction of the foundation pit is more convenient, the stability of the structure is better, and the installation of the inclined support assembly and the tension rope assembly is also convenient, so that the stability of the foundation pit continuous wall can be ensured.
Preferably, the second prefabricated connecting component comprises I-steel and a supporting frame, wherein the I-steel connects the arched prefabricated walls on two adjacent sides together, and a second welding rod is arranged on one end face of the I-steel along the height direction of the foundation pit; the support frames are fixed between the arch prefabricated walls on two adjacent sides through bolt assemblies, the support frames are arranged at intervals along the height direction of the I-steel, support grooves are fixed on corner faces of the support frames facing the inner side of the foundation pit, and mounting holes for mounting tension rope assemblies are respectively formed in two perpendicular connection faces of the support frames; a crown support frame is further arranged on the I-steel which is positioned at the top end of the foundation pit along the height direction of the foundation pit, and the crown support frame is positioned above the support frame on the I-steel; by adopting the technical scheme, the installation connection between the adjacent arched prefabricated walls at the corners of the foundation pit is more convenient, the stability of the structure is better, and the installation of the inclined support assembly and the tension rope assembly is convenient, so that the stability of the continuous wall of the foundation pit can be ensured.
Preferably, the third prefabricated connecting components are sequentially arranged at intervals along the length direction of the arch-shaped prefabricated wall body, the third prefabricated connecting components comprise connecting rings, connecting rods, the connecting rings are respectively arranged on the connecting surfaces of the adjacent arch-shaped prefabricated wall bodies arranged along the height direction of the foundation pit, the connecting rings between one arch-shaped prefabricated wall body and the other arch-shaped prefabricated wall body are distributed in a staggered manner along the width direction of the arch-shaped prefabricated wall body, and the connecting rods are inserted between the connecting rings along the width direction of the arch-shaped prefabricated wall body after the upper arch-shaped prefabricated wall body and the lower arch-shaped prefabricated wall body are spliced; the installation connection between the adjacent arch prefabricated walls in the height direction of the foundation pit is more convenient, and the stability of the structure is better.
Preferably, the grouting pipes are sequentially arranged at intervals along the length direction of the arch-shaped prefabricated wall body, grouting grooves are formed in the upper end face and/or the lower end face of each of the arch-shaped prefabricated wall body and the wall section joint, grouting holes and grouting holes are formed in the groove walls of the grouting grooves, the grouting grooves are in groove shapes, and the groove walls of the grouting grooves are flush with 1/2 of the diameter of the connecting ring on the arch-shaped prefabricated wall body or the wall section joint; through the structure, when cement slurry is injected through the grouting pipe, the cement slurry can more quickly flow into the grouting groove, so that the stability between the adjacent arch prefabricated walls in the height direction of the foundation pit is further enhanced.
Preferably, the tension rope assembly comprises a steel cable, a tension box and a penetrating jack, wherein the steel cable is inserted into the tension box, a wire outlet hole is formed in the tension box, and the penetrating jack is arranged on one side of the tension box; under the action of the steel cable, the tension box and the punching jack, each arch prefabricated wall body has better compression resistance.
Preferably, the oblique supporting component comprises a shaft rod and an elastic supporting mechanism, wherein the elastic supporting mechanism comprises an olive-shaped pushing elastic component, a supporting block fixed with the end part of the pushing elastic component and a compacting component for exerting force on the pushing elastic component so as to push the supporting block to the side surface of the foundation pit, the shaft rod is arranged along the central axis of the pushing elastic component, and two ends of the shaft rod are respectively connected with the supporting block and the end part of the pushing elastic component through pulley components; 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 in the chest expander, and the chest expander is fixed on the other end of the pushing elastic assembly; the olive-shaped pushing elastic component is arranged, the steel rope is pulled to further compress the compressing component, the pushing elastic component is radially compressed towards the shaft rod, so that the pushing elastic component slides along the axial direction of the shaft rod and is slid through the pulley component, the supporting block is pushed towards the side surface of the foundation pit, the supporting of the foundation pit is formed, and the safety of excavation of the foundation pit is ensured; and through the cooperation of chest expander and steel cable, in the foundation ditch continuous excavation in-process, strutting arrangement can be timely and accurate reach the best laminating support with the opposite underground diaphragm wall of both sides or enclose between the purlin roof beam to the effectual effect efficiency who improves the foundation ditch internal support has the regulation in time, the degree of accuracy of regulation is high and the single support is adjustable in advance in anytime and anywhere, realizes that the axial force numerical value is adjusted accurately reliably and the axial force numerical value equilibrium of every supporting position application is good, can exert the advantage of supporting the system effect furthest.
Preferably, the pushing elastic component comprises a plurality of arched elastic steel sheets and fixing rings, wherein the arched elastic steel sheets are positioned at the outer side of the shaft rod, two ends of the arched elastic steel sheets are respectively fixed on the two fixing rings, and the two fixing rings are respectively sleeved on two ends of the shaft rod; through the arrangement of the arched elastic steel sheets, the pushing elastic assembly is more rapid and convenient in the compression, resetting and expanding processes of the pushing elastic assembly along the two sides of the shaft lever.
Preferably, the pulley assembly comprises a first pulley assembly and a second pulley assembly, the first pulley assembly is arranged between the shaft rod and the supporting block, and the second pulley assembly is arranged between the shaft rod and the end part of the pushing elastic assembly; therefore, in the process of expanding or resetting the pushing elastic component, the supporting block and the pushing elastic component can smoothly slide on the shaft lever.
The construction method adopting the foundation pit support device comprises the following steps:
1. digging pit slots for placing arch prefabricated walls on the foundation pit which is not excavated through a slot milling machine, and sequentially excavating the pit slots on the foundation pit which is not excavated in a slot-skipping mode;
2. placing a first arch-shaped prefabricated wall body into a pit slot, splicing the upper end of the arch-shaped prefabricated wall body and a second arch-shaped prefabricated wall body which are pre-placed into the pit slot outside a foundation pit through a third prefabricated connecting assembly, sequentially placing the arch-shaped prefabricated wall bodies which are required to be placed into the pit slot in the splicing mode, injecting cement slurry into a grouting slot formed by splicing the upper arch-shaped prefabricated wall body and the lower arch-shaped prefabricated wall body through a grouting pipe, and enabling the cement slurry to flow out upwards from the bottom of the arch-shaped prefabricated wall body along two vertical sides through slurry outlets in the grouting slot so as to fill gaps between the two sides of the arch-shaped prefabricated wall body and soil bodies;
3. after the arch-shaped prefabricated wall bodies are placed in the pit slots which are sequentially excavated in an interval mode, another pit slot for placing the arch-shaped prefabricated wall bodies is excavated between the pit slots which are distributed in an interval mode, and the arch-shaped prefabricated wall bodies are placed in the mode of the step 2;
4. digging a pit slot for placing a wall section joint between adjacent pit slots in which an arch prefabricated wall body is placed, placing a first wall section joint with U-shaped steel into the pit slot, splicing the upper end of the wall section joint and a second wall section joint which is pre-placed into the pit slot outside a foundation pit through a third prefabricated connecting component, sequentially placing the wall section joints which are required to be placed into the pit slot according to the splicing mode, injecting high-grade cement paste into a grouting slot formed by splicing the upper wall section joint and the lower wall section joint through a grouting pipe, and enabling the high-grade cement paste to flow out upwards from the bottom of the wall section joint along the vertical periphery through a grouting hole in the grouting slot so as to fill a gap between the periphery of the wall section joint and a soil body;
5. after the joints of the arched prefabricated wall body and the wall segments are arranged along the length direction or the width direction of the foundation pit which is not excavated, the arched prefabricated wall body is arranged between two pit slots at the corner of the foundation pit through the step 2, I-steel is fixed on one side of the arched prefabricated wall body, and the arched prefabricated wall body at the other side of the arched prefabricated wall body is arranged along the I-steel and the excavated foundation pit;
6. sequentially passing through the steps 1 to 5 until the foundation pit continuous wall is formed;
7. a crown support is arranged at the uppermost end of the continuous wall body surrounding the foundation pit, one end of the crown support is fixed on a crown support frame on the I-steel, and the other end of the crown support is fixed with a steel loop and is arranged on a wall section joint through the steel loop;
8. along with the excavation of the foundation pit in the foundation pit continuous wall body, the diagonal bracing assembly is placed in the bracing groove on the wall section joint and the bracing groove on the I-steel, and meanwhile, the tension rope assembly is installed, and the diagonal bracing assembly is placed in sequence along the arrangement direction of the bracing groove on the wall section joint.
The beneficial effects of the invention are as follows: by adopting the construction method of the foundation pit support device, the arch prefabricated wall bodies and the prefabricated connecting assemblies can be combined and surrounded into the foundation pit continuous wall body, the tension rope assemblies and the crown supports are arranged on each arch prefabricated wall body, and along with the gradual excavation of the foundation pit, the foundation pit can be timely and accurately pushed outwards towards the foundation pit continuous wall body through the inclined support assemblies, so that the risks of deformation and collapse of the foundation pit can be reduced.
Drawings
Fig. 1 is a schematic view of a partial structure of a foundation pit enclosure of the present invention.
Fig. 2 is a schematic view of the structure between the arch-shaped prefabricated wall and the first prefabricated connecting assembly and the tension rope assembly according to the present invention.
Fig. 3 is an enlarged schematic view of the structure at a of fig. 2.
Fig. 4 is an enlarged schematic view of the structure at C of fig. 1.
Fig. 5 is an enlarged schematic view of the structure at B of fig. 1.
Fig. 6 is a schematic perspective view of the diagonal support member of the present invention.
Fig. 7 is an enlarged schematic view of the structure at a of fig. 6.
Fig. 8 is an enlarged schematic view of the structure at B of fig. 6.
Fig. 9 is a schematic view of the bottom structure of the arch-shaped prefabricated wall according to the present invention.
Figure 10 is a schematic view of the wall segment joint construction of the present invention,
fig. 11 is a schematic diagram showing a construction method according to the present invention.
Fig. 12 is a schematic view of a second construction step of the construction method of the present invention.
Fig. 13 is a schematic view of a third step structure of the construction method of the present invention.
Fig. 14 is a schematic view of a fourth construction step of the construction method of the present invention.
Fig. 15 is a schematic view of a fourth construction step of the construction method of the present invention.
Fig. 16 is a schematic view of a fifth construction step of the construction method of the present invention.
Fig. 17 is a step six schematic diagram of the construction method of the present invention.
Fig. 18 is a schematic diagram of the construction method of the present invention in the seventh and eighth steps.
The reference numerals in the drawings are respectively: 1. a shaft lever; 2. an elastic supporting mechanism; 3. a support block; 4. a compression assembly; 5. pushing the elastic component; 6. a pulley assembly; 7. grouting pipe; 8. a crown support; 9. a foundation pit; 10. an inclined support assembly; 31. a through hole; 41. a chest expander; 42. a steel rope; 51. an arcuate elastic steel sheet; 52. a fixing ring; 53. a groove; 61. a first pulley assembly; 62. a second pulley assembly; 61-1, bearing wheels; 61-2, a chute; 61-3, mounting slots; 62-1, pulleys; 62-2, chute blocks; 62-3, a bracket; 100. an arched prefabricated wall body; 200. a tension rope assembly; 300. a first prefabricated connection assembly; 400. a second prefabricated connecting assembly; 500. a third prefabricated connecting assembly; 600. pit slots; 101. grouting grooves; 102. grouting holes; 103. a pulp outlet hole; 201. a wire rope; 202. a tension box; 203. a center-penetrating jack; 204. a wire outlet hole; 301. a wall section joint; 302. u-shaped steel; 303. a support groove; 304. a first electrode; 305. a steel collar; 306. a mounting hole; 401. i-steel; 402. a support frame; 403. a crown support; 404. a second electrode; 405. a tank body; 501. a connecting ring; 502. and (5) connecting a rod.
Detailed Description
The invention will be described in detail below with reference to the attached drawings: as shown in fig. 1 to 5, the invention comprises arch prefabricated wall bodies 100, a foundation pit 9 is formed by a plurality of arch prefabricated wall bodies 100, adjacent arch prefabricated wall bodies 100 along the length or width direction of the foundation pit 9 are fixedly connected through a first prefabricated connecting component 300, and adjacent arch prefabricated wall bodies 100 at the corners of the foundation pit 9 are fixedly connected through a second prefabricated connecting component 400; the adjacent arch-shaped prefabricated wall bodies 100 along the height direction of the foundation pit 9 are fixedly connected through a third prefabricated connecting assembly 500, and a plurality of grouting pipes 7 which are distributed at intervals along the height direction of the arch-shaped prefabricated wall bodies 100 and penetrate through the arch-shaped prefabricated wall bodies 100 are arranged; the upper end surface of the foundation pit 9 is provided with crown supports 8 through a first prefabricated connecting component 300 and a second prefabricated connecting component 400, a plurality of inclined support components 10 are arranged in the foundation pit 9 through the first prefabricated connecting component 300 and the second prefabricated connecting component 400, and the inclined support components 10 are staggered along the height direction of the foundation pit 9 and are positioned below the crown supports 8; each arch-shaped prefabricated wall 100 is installed with a tension rope assembly 200 through a first prefabricated connecting assembly 300 and/or a second prefabricated connecting assembly 400; compared with the prior art, the invention has the advantages that: the novel mode of arch underground diaphragm wall, pull rod support and compression rod support is adopted, so that good collocation of a soil body-enclosing structure-support system is realized, and the stress effect of the support structure is better. The combined structure of the arched underground diaphragm wall groove section makes full use of the soil arch effect, and the underground diaphragm wall groove section is arranged into an arch shape from a plane shape, so that the horizontal soil pressure born by the arched underground diaphragm wall groove section is the soil pressure of a free area at the front part of the soil arch, is the soil pressure in a limited range and is much smaller than the soil pressure in a semi-infinite form born by the plane-shaped underground diaphragm wall groove section. The method not only reduces the soil pressure acting on the supporting structure, but also effectively utilizes the compressive strength of soil and wall structures, reasonably utilizes the shearing force or bending moment in the arch body to minimize, and realizes the prior arch and the subsequent stress, thereby actively overcoming the problem of wall deformation during the unsupported exposure period, reducing the vertical and horizontal deformation of the soil around the foundation pit and improving the overall stability of the foundation pit.
The first prefabricated connecting assembly 300 comprises a wall section joint 301, U-shaped steel 302 and a supporting groove 303, wherein the surface of the wall section joint 301 facing the outer side of the foundation pit 9 is a W-shaped surface, the U-shaped steel 302 is provided with two U-shaped surfaces and is respectively fixed on the W-shaped surfaces of the wall section joint 301, the arched prefabricated walls 100 on two adjacent sides are connected together through the U-shaped steel 302, and a first welding rod 304 is arranged on one end surface of the U-shaped steel 302 along the height direction of the foundation pit 9; the three supporting grooves 303 are respectively fixed on the surface of the wall section joint 301 facing the inner side of the foundation pit, two supporting grooves 303 are positioned on the end corners of the wall section joint 301, and the three supporting grooves 303 are distributed obliquely along the height direction of the wall section joint 301; the two side surfaces of the wall section joint 301 are respectively provided with a mounting hole 306 for mounting the tension rope assembly 200, and the wall section joint 301 is internally provided with a grouting pipe 7 which penetrates through the wall section joint along the height direction of the wall section joint 301; the adjacent wall section joints 301 along the height direction of the foundation pit are fixedly connected through a third prefabricated connecting assembly 500, connecting rings 501 and connecting rods 502 are also arranged between the adjacent wall section joints 301, the connecting rings 501 between one wall section joint 301 and the other wall section joint 301 are distributed in a staggered manner along the length direction of the wall section joint 301, the connecting rods 502 are inserted between the connecting rings 501 along the length direction of the arched prefabricated wall body 100, grouting grooves 101 are formed in the upper end face and/or the lower end face of the wall section joint 301, and grouting holes 102 and grouting holes 103 are formed in the groove walls of the grouting grooves 101.
The second prefabricated connecting assembly 400 comprises an I-steel 401 and a supporting frame 402, wherein the I-steel 401 connects the arched prefabricated walls 100 on two adjacent sides together, and a second welding rod 404 is arranged on one end face of the I-steel 401 along the height direction of the foundation pit 9; the support frames 402 are fixed between the arch prefabricated walls 100 on two adjacent sides through bolt assemblies, the support frames 402 are arranged at intervals along the height direction of the I-steel 401, the support grooves 303 are fixed on the corner faces of the support frames 402 facing the inner side of the foundation pit 9, and mounting holes 306 for mounting the tension rope assemblies 200 are respectively arranged on two vertical joint faces of the support frames 402; a crown support frame 403 is further arranged on the I-steel 401 along the height direction of the foundation pit 9 and positioned at the top end of the foundation pit, and the crown support frame 403 is positioned above the support frame 402 on the I-steel 401; and the crown support 403 is provided with three slots 405 for mounting the crown support 8, two of the slots 405 being located on two perpendicular interfaces of the crown support 403 and the other being located on an end corner of the crown support 403.
The third prefabricated connecting components 500 are sequentially arranged at intervals along the length direction of the arch-shaped prefabricated wall body 100, each third prefabricated connecting component 500 comprises a connecting ring 501, connecting rods 502 and connecting rings 501 which are respectively arranged on the joint surfaces of the adjacent arch-shaped prefabricated wall bodies 100 arranged along the height direction of the foundation pit 9, the connecting rings 501 between one arch-shaped prefabricated wall body 100 and the other arch-shaped prefabricated wall body 100 are distributed in a staggered mode along the width direction of the arch-shaped prefabricated wall body 100, and the connecting rods 502 are inserted between the connecting rings 501 along the width direction of the arch-shaped prefabricated wall body 100 after the upper arch-shaped prefabricated wall body 100 and the lower arch-shaped prefabricated wall body 100 are spliced.
The grouting pipes 7 are sequentially arranged at intervals along the length direction of the arch-shaped prefabricated wall body 100, grouting grooves 101 are formed in the upper end face and/or the lower end face of the arch-shaped prefabricated wall body 100 and the wall section joints 301, and the grouting grooves 101 in the arch-shaped prefabricated wall body 100 and the grouting grooves 101 in the wall section joints 301 are respectively and independently distributed to prevent cement paste from being mixed; the wall of the grouting groove 101 is provided with a grouting hole 102 and a grouting hole 103 which are respectively positioned at two sides of the grouting groove 101; the grouting groove 101 is in a groove shape, and the groove wall of the grouting groove 101 is flush with 1/2 of the diameter of the connecting ring 501 on the arched prefabricated wall body 100 or the wall section joint 301.
The tension rope assembly 200 comprises a steel cable 201, a tension box 202 and a penetrating jack 203, wherein the steel cable 201 is inserted into the tension box 202, a wire outlet hole 204 is formed in the tension box 202, and the penetrating jack 203 is arranged on one side of the tension box 202.
As shown in fig. 6 to 8, the diagonal support assembly 10 comprises a shaft lever 1 and an elastic support mechanism 2, wherein the elastic support mechanism 2 comprises an olive-shaped pushing elastic assembly 5, a support block 3 fixed with the end part of the pushing elastic assembly 5, and a compacting assembly 4 for exerting force on the pushing elastic assembly 5 to push the support block 3 to the side surface of a foundation pit, and the olive-shaped pushing elastic assembly 5 is convenient for the pushing elastic assembly 5 to be unfolded and reset, and better balance of force exerted by the pushing elastic assembly 5 in the unfolding process is 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 compressing assembly 4 comprises a chest expander 41 and a steel rope 42, the chest expander 41 adopts a penetrating jack, 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 on one end of the pushing elastic assembly 5, namely fixed on the fixed ring 52, the other end of the steel rope 42 is inserted into the chest expander 41, and the chest expander 41 is fixed on the other end of the pushing elastic assembly 5, namely fixed on the end part of the arched elastic steel sheet; the olive-shaped pushing elastic component is arranged, and the pushing elastic component is radially compressed towards the shaft rod through the compression component, so that the pushing elastic component slides along the axial direction of the shaft rod and is slid through the pulley component, the supporting block is pushed towards the side surface of the foundation pit, the supporting of the foundation pit is formed, and the safety of excavation of the foundation pit is ensured; and through the cooperation of chest expander and steel cable, in the foundation ditch continuous excavation in-process, strutting arrangement can be timely and accurate with the underground diaphragm wall of relative both sides or enclose between the purlin roof beam laminating support to the effectual overall stability who improves the foundation ditch internal support has the advantage that in time, the regulation degree of accuracy is high and the application of force equilibrium is good.
The pushing elastic assembly 5 comprises eight arched elastic steel sheets 51 and a fixed ring 52, wherein eight arched elastic steel sheets 51 are arranged around the axial outer side of the shaft rod 1, and the adjacent arched 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, and the two fixing rings 52 are respectively sleeved on the two ends of the shaft rod 1 and realize radial limit through the second pulley component 62; through the distribution of the arched elastic steel sheets, the pressing force and the propping force are more stable in the compression, resetting and propping up of the propping elastic component 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 attaching and supporting 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 rod 1 through the pulley component 6, the supporting block 3 is respectively arranged at two ends of the shaft rod 1 and is respectively fixed on the fixed ring 52, the supporting block 3 is used for tightly pushing the side surface of the foundation pit, the supporting block 3 slides through the supporting of the pushing elastic component 5, the displacement of the two supporting blocks 3 along the supporting state of the shaft rod 1 is 5-6 cm, the supporting effect on the underground continuous wall or the enclosing purlin beam of the foundation pit is probably not achieved due to the fact that the supporting effect on the underground continuous wall or the enclosing purlin beam of the foundation pit is sometimes larger, 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 3 can be fixed on one side of the supporting block 3 or the existing supporting block 3 is thickened, and the supporting block 3 is more flexible through the cooperation between the supporting block 3 and the shaft rod 1, so that the foundation pit with the force application and the foundation pit excavation deformation of different supporting structures can be more suitable.
The steel rope 42 is spirally wound on the outer sides of the plurality of arched elastic steel sheets 51, the steel rope pitches wound on the two ends of the arched elastic steel sheets 51 are larger than those wound on the middle section of the arched elastic steel sheets 51, namely, the ratio of the steel rope pitches wound on the two ends to those wound on the middle section is 2:1, the steel rope 42 is wound on the arched elastic steel sheets 51 and is divided into three equally divided sections, when the steel rope 42 is tensioned and the arched elastic steel sheets 51 are compressed in the radial direction of the shaft rod, the tension and the force application of the steel rope are ensured to be more convenient, so that the compression deformation of the arched elastic steel sheets is quicker, the stress of the arched elastic steel sheets 51 on the two ends is more uniform, and the deformation of the arched elastic steel sheets 51 is avoided.
The surface of the arched 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 arched 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 slide in the groove and is not easy to slip all the time when the elastic component is pushed under a compression state or a reset state in the tensioning or releasing process of the steel rope, 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 of the pushing elastic component 5 to the elongation L is (10-12) to 1, and the elongation L is the pushing displacement; by the cooperation of the chest expander 41 and the steel rope 42, the displacement of the pushing elastic component 5 in the expanding direction can be ensured through the proportional relation.
As shown in fig. 7 and 8, 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 support block 3, and the second pulley assembly 62 is disposed between the shaft 1 and the end of the urging elastic assembly 5.
The first pulley assembly 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 rod 1 in a compressible and resettable manner, the bearing wheel is fixed at two ends of the shaft rod 1 and distributed at equal intervals along the circumferential direction of the shaft rod 1, the mounting grooves 61-3 are distributed in one-to-one correspondence with the sliding groove 61-2, the outer diameter surface of the bearing wheel 61-1 is contacted with the sliding groove 61-2, the bearing wheel 61-1 is positioned in the bearing wheel 61-1 and the sliding groove 61-3 through the matching of the sliding groove 61-2 and the mounting groove 61-3, and the length of the sliding groove 61-2 is 4 cm to 8cm; the second pulley assembly 62 comprises eight pulleys 62-1 and chute blocks 62-2, wherein the pulleys 62-1 are connected to the inner wall of the octagonal fixed ring 52 through brackets 62-3 and distributed at equal intervals, the brackets 62-3 have the function of compression and resetting, the chute blocks 62-2 are provided with eight chute blocks and mounted on the circumferential wall of the shaft rod 1 and distributed at equal intervals, the pulleys 62-1 and the chute blocks 62-2 are distributed in a one-to-one correspondence, the radial end surfaces of the pulleys 62-1 are abutted against the chute blocks 62-2, and the length of a chute on the chute block 62-2 is 4-8 cm; therefore, in the process of expanding or resetting 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 the supporting device is not tightly contacted with the side surface of the foundation pit and deforms the wall of the foundation pit, the steel rope 42 is tensioned through the chest expander 41, so that the arched elastic steel sheet 51 is compressed towards the radial direction of the shaft rod 1, namely the sagittal height H is continuously reduced, and then the arched elastic steel sheet 51 is spread towards two sides along the axial direction of the shaft rod 1, namely the elongation is continuously increased, so that the supporting block 3 is tightly contacted with the side surface of the foundation pit to block the deformation of the wall.
The construction method of the foundation pit support device comprises the following steps: as shown in figures 11 to 18 of the drawings,
1. digging pit slots 600 for placing the arch prefabricated wall body 100 on the non-excavated foundation pit through a slot milling machine, and sequentially excavating the pit slots 600 on the non-excavated foundation pit in a slot-skipping mode;
2. placing a first arch-shaped prefabricated wall body 100 into a pit slot 600, splicing the upper end of the arch-shaped prefabricated wall body 100 and a second arch-shaped prefabricated wall body 100 which are pre-placed into the pit slot 600 outside a foundation pit 9 through a third prefabricated connecting assembly 500, sequentially placing the arch-shaped prefabricated wall bodies 100 which are required to be placed into the pit slot 600 in the splicing mode, injecting cement slurry into grouting slots 101 formed by splicing the upper arch-shaped prefabricated wall body 100 and the lower arch-shaped prefabricated wall body 100 through grouting pipes 7, and enabling the cement slurry to flow out from the bottoms of the arch-shaped prefabricated wall bodies 100 upwards along two vertical sides through slurry outlets 103 in the grouting slots 101 so as to fill gaps between two sides of the arch-shaped prefabricated wall bodies 100 and soil bodies; further, the side friction resistance of the outer edge diaphragm wall and the soil body is enhanced, and the anti-sedimentation capacity of the diaphragm wall is remarkably improved;
3. after the arch-shaped prefabricated wall bodies 100 are placed in the pit slots 600 which are sequentially excavated in an interval manner, another pit slot 600 for placing the arch-shaped prefabricated wall bodies 100 is excavated between the pit slots 600 which are distributed in an interval manner, and the arch-shaped prefabricated wall bodies 100 are placed in a step 2 manner;
4. digging pit slots 600 for placing wall section joints between adjacent pit slots 600 in which arch-shaped prefabricated walls are placed, placing a first wall section joint 301 with a U-shaped steel 302 in the pit slots 600, splicing the upper end of the wall section joint 301 and a second wall section joint 301 which is pre-placed in the pit slots outside a foundation pit through a third prefabricated connecting assembly 300, sequentially placing the wall section joints 301 to be placed in the pit slots 600 according to the splicing mode, injecting high-grade cement slurry into grouting slots 101 formed by splicing the upper wall section joint 301 and the lower wall section joint 301 through grouting pipes 7, and enabling the high-grade cement slurry to flow out upwards from the bottom of the wall section joint 301 along the vertical periphery through grouting holes 103 in the grouting slots 101 so as to fill gaps between the periphery of the wall section joint 301 and soil bodies; further, the side friction resistance of the wall section joint and the soil body is enhanced, and the anti-sedimentation capacity of the wall section joint is remarkably improved;
5. after the arch prefabricated wall body 100 and the wall section joint 301 are placed along the length direction or the width direction of the foundation pit 9 which is not excavated, the arch prefabricated wall body 100 is placed between two pit slots 600 at the corner of the foundation pit through the step 2, I-steel 401 is fixed on the arch prefabricated wall body 100 at one side, and the arch prefabricated wall body 100 at the other side is placed along the I-steel 401 and the excavated foundation pit 9;
6. sequentially passing through the steps 1 to 5 until the foundation pit continuous wall is formed;
7. a crown support 8 is arranged at the uppermost end of a continuous wall surrounding a foundation pit, one end of the crown support 8 is fixed on a crown support frame 403 on I-steel 401, and the other end of the crown support 8 is fixed with a steel loop 305 and is arranged on a wall section joint 301 through the steel loop 305;
8. along with the excavation of the foundation pit in the foundation pit continuous wall body, the diagonal bracing assembly 10 is placed in the bracing groove 303 on the wall section joint 301 and the bracing groove 303 on the I-steel 401, and the tension rope assembly 200 is installed at the same time, and the diagonal bracing assemblies 10 are placed in sequence along the arrangement direction of the bracing groove 303 on the wall section joint 301.
The present invention is not limited to the above embodiments, and any modification of the structural design provided by the present invention, regardless of any changes in shape or material composition, should be considered as being within the scope of the present invention.
Claims (9)
1. The utility model provides a foundation ditch support device, includes arch prefabricated wall body (100) to enclose into a foundation ditch (9) by a plurality of arch prefabricated wall bodies (100), its characterized in that: adjacent arched prefabricated walls (100) along the length or width direction of the foundation pit (9) are fixedly connected through a first prefabricated connecting assembly (300), and adjacent arched prefabricated walls (100) at the corner of the foundation pit (9) are fixedly connected through a second prefabricated connecting assembly (400); the adjacent arch prefabricated walls (100) along the height direction of the foundation pit (9) are fixedly connected through a third prefabricated connecting assembly (500), and a plurality of grouting pipes (7) which are distributed at intervals along the height direction of the arch prefabricated walls (100) and penetrate through the arch prefabricated walls (100) are arranged; the upper end face of the foundation pit (9) is provided with crown supports (8) through a first prefabricated connecting component (300) and a second prefabricated connecting component (400), a plurality of inclined support components (10) are arranged in the foundation pit (9) through the first prefabricated connecting component (300) and the second prefabricated connecting component (400), and the inclined support components (10) are staggered along the height direction of the foundation pit (9) and are positioned below the crown supports (8); each arch-shaped prefabricated wall body (100) is provided with a tension rope assembly (200) through a first prefabricated connecting assembly (300) and/or a second prefabricated connecting assembly (400); the first prefabricated connecting assembly (300) comprises a wall section joint (301), U-shaped steel (302) and a supporting groove (303), wherein the surface of the wall section joint (301) facing the outer side of the foundation pit (9) is a W-shaped surface, the U-shaped steel (302) is provided with two W-shaped surfaces which are respectively fixed on the wall section joint (301), the arched prefabricated walls (100) on two adjacent sides are connected together through the U-shaped steel (302), and a first welding rod (304) is arranged on one end surface of the U-shaped steel (302) along the height direction of the foundation pit (9); the three supporting grooves (303) are respectively fixed on the surface of the wall section joint (301) facing the inner side of the foundation pit, two supporting grooves (303) are positioned on the end corners of the wall section joint (301), and the three supporting grooves (303) are obliquely distributed along the height direction of the wall section joint (301); the two side surfaces of the wall section joint (301) are respectively provided with a mounting hole (306) for mounting the tension rope assembly (200), and a grouting pipe (7) penetrating through the wall section joint along the height direction of the wall section joint (301) is arranged in the wall section joint (301); and a steel collar (305) is further arranged on the wall section joint (301) which is positioned at the top end of the foundation pit (9) along the height direction of the foundation pit (9).
2. The foundation pit bracing device according to claim 1, wherein: the second prefabricated connecting assembly (400) comprises I-steel (401) and a supporting frame (402), the I-steel (401) connects the arched prefabricated walls (100) on two adjacent sides together, and a second welding rod (404) is arranged on one end face of the I-steel (401) along the height direction of the foundation pit (9); the support frames (402) are fixed between the arch prefabricated walls (100) on two adjacent sides through bolt assemblies, the support frames (402) are arranged at intervals along the height direction of the I-steel (401), support grooves (303) are fixed on corner faces of the support frames (402) facing the inner side of the foundation pit (9), and mounting holes (306) for mounting the tension rope assemblies (200) are respectively formed in two perpendicular connection faces of the support frames (402); and a crown support frame (403) is further arranged on the I-steel (401) which is positioned at the top end of the foundation pit along the height direction of the foundation pit (9), and the crown support frame (403) is fixed on the arch prefabricated wall body (100) and is positioned above the support frame (402) on the I-steel (401).
3. The foundation pit bracing device according to claim 2, wherein: the prefabricated wall body (100) of arch is followed in the prefabricated coupling assembling of third (500) interval in proper order and is arranged, prefabricated coupling assembling of third (500) include go-between (501), connective bar (502) go-between (501) set up respectively on the face of meeting of the prefabricated wall body (100) of adjacent arch that sets up along foundation ditch (9) direction of height, and go-between (501) between prefabricated wall body (100) of arch and another prefabricated wall body (100) are the staggered distribution along the width direction of prefabricated wall body (100) of arch, connective bar (502) are two from top to bottom prefabricated wall body (100) of arch are spliced the width direction of back along prefabricated wall body (100) of arch alternates between each go-between (501).
4. The foundation pit bracing device according to claim 3, wherein: grouting pipes (7) are sequentially arranged at intervals along the length direction of an arch-shaped prefabricated wall body (100), grouting grooves (101) are formed in the upper end face and/or the lower end face of the arch-shaped prefabricated wall body (100) and the wall section joint (301), grouting holes (102) and grouting holes (103) are formed in the groove walls of the grouting grooves (101), the grouting grooves (101) are in groove shapes, and the groove walls of the grouting grooves (101) are flush with the diameter 1/2 of a connecting ring (501) on the arch-shaped prefabricated wall body (100) or the wall section joint (301).
5. The foundation pit bracing device according to claim 1, wherein: the tension rope assembly (200) comprises a steel rope (201), a tension box (202) and a penetrating jack (203), wherein the steel rope (201) is inserted into the tension box (202), a wire outlet hole (204) is formed in the tension box (202), and the penetrating jack (203) is arranged on one side of the tension box (202).
6. The foundation pit bracing device according to claim 1, wherein: the inclined support assembly (10) comprises a shaft rod (1) and an elastic support mechanism (2), wherein the elastic support mechanism (2) comprises an olive-shaped pushing elastic assembly (5), a support block (3) fixed with the end part of the pushing elastic assembly (5) and a pressing assembly (4) for applying force on the pushing elastic assembly (5) so that the support block (3) is pushed towards the side surface of a foundation pit, the shaft rod (1) is arranged along the central axis of the pushing elastic assembly (5), and two ends of the shaft rod (1) are connected to the support block (3) and the end part of the pushing elastic assembly (5) through pulley assemblies (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 on one end of the pushing elastic assembly (5), the other end of the steel rope (42) is inserted on the chest expander (41), and the chest expander (41) is fixed on the other end of the pushing elastic assembly (5).
7. The foundation pit bracing device according to claim 6, 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 sides of the shaft rods (1), two ends of the arched elastic steel sheets (51) are respectively fixed on the two fixing rings (52), and the two fixing rings (52) are respectively sleeved on two end parts of the shaft rods (1).
8. The foundation pit bracing device according to claim 6, 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 rod (1) and the supporting block (3), and the second pulley assembly (62) is arranged between the shaft rod (1) and the end part of the pushing elastic assembly (5).
9. A construction method using the foundation pit enclosure according to any one of claims 1 to 8, characterized in that: the construction method comprises the following steps:
1. digging pit slots (600) for placing the arch prefabricated wall body (100) on the foundation pit which is not excavated through a slot milling machine, and sequentially excavating the pit slots (600) on the foundation pit which is not excavated in a slot-skipping mode;
2. placing a first arch-shaped prefabricated wall body (100) into a pit slot (600), pre-placing the upper end of the arch-shaped prefabricated wall body (100) and a second arch-shaped prefabricated wall body (100) into the pit slot (600) outside a foundation pit (9) through a third prefabricated connecting assembly (500), sequentially placing the arch-shaped prefabricated wall bodies (100) to be placed into the pit slot (600) according to the splicing mode, injecting cement slurry into the grouting slots (101) formed by splicing the upper arch-shaped prefabricated wall body (100) and the lower arch-shaped prefabricated wall body (100) through grouting pipes (7), and enabling the cement slurry to flow out upwards from the bottom of the arch-shaped prefabricated wall body (100) along two vertical sides through slurry outlets (103) in the grouting slots (101), so that gaps between two sides of the arch-shaped prefabricated wall body (100) and soil bodies are filled;
3. after the arch-shaped prefabricated wall bodies (100) are placed in the pit grooves (600) which are sequentially excavated in an interval mode, another pit groove (600) for placing the arch-shaped prefabricated wall bodies (100) is excavated between the pit grooves (600) which are distributed in an interval mode, and the pit grooves are placed in the arch-shaped prefabricated wall bodies (100) in a step 2 mode;
4. digging pit slots (600) for placing wall section joints between adjacent pit slots (600) with arch prefabricated walls, placing a first wall section joint (301) with U-shaped steel (302) into the pit slots (600), splicing the upper end of the wall section joint (301) with a second wall section joint (301) which is pre-placed into the pit slots outside a foundation pit through a third prefabricated connecting assembly (500), sequentially placing the wall section joints (301) to be placed into the pit slots (600) in the splicing mode, and injecting high-grade cement slurry into the grouting slots (101) formed by splicing the upper wall section joint and the lower wall section joint (301) through grouting pipes (7), wherein the high-grade cement slurry flows upwards from the bottom of the wall section joint (301) along the vertical periphery through slurry outlet holes (103) in the grouting slots (101), so that gaps between the periphery of the wall section joint (301) and soil bodies are filled;
5. after the arch prefabricated wall body (100) and the wall section joint (301) are placed along the length direction or the width direction of the foundation pit (9) which is not excavated, placing the arch prefabricated wall body (100) between two pit slots (600) at the corner of the foundation pit through the step 2, fixing I-steel (401) on the arch prefabricated wall body (100) at one side, and placing the arch prefabricated wall body (100) at the other side along the I-steel (401) and the excavated foundation pit (9);
6. sequentially passing through the steps 1 to 5 until the foundation pit continuous wall is formed;
7. a crown support (8) is arranged at the uppermost end of a continuous wall surrounding a foundation pit, one end of the crown support (8) is fixed on a crown support frame (403) on an I-steel (401), and the other end of the crown support (8) is fixed with a steel loop (305) and is arranged on a wall section joint (301) through the steel loop (305);
8. along with excavation of a foundation pit in a foundation pit continuous wall body, the diagonal support assembly (10) is placed in the support groove (303) on the wall section joint (301) and the support groove (303) on the I-steel (401), and meanwhile the tension rope assembly (200) is installed, and the diagonal support assembly (10) is placed in sequence along the direction of the support groove (303) on the wall section joint (301).
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| CN107740426A (en) * | 2017-10-13 | 2018-02-27 | 南京工业大学 | A kind of assembled arcading wall base pit supporting construction and construction technology |
| CN212175797U (en) * | 2019-11-22 | 2020-12-18 | 中国市政工程西北设计研究院有限公司 | Large-span underground space deep foundation pit supporting system |
| CN111705809A (en) * | 2020-06-18 | 2020-09-25 | 深圳市蛇口招商港湾工程有限公司 | Deep foundation pit construction structure and deep foundation pit construction method |
| CN214033732U (en) * | 2020-11-09 | 2021-08-24 | 成都市市政工程设计研究院 | Plate rib type anchor rod retaining wall of prefabricated arched retaining plate |
| CN214695649U (en) * | 2021-03-29 | 2021-11-12 | 赵正龙 | Deep foundation pit supporting structure |
| CN113338297B (en) * | 2021-06-04 | 2022-09-30 | 中铁十局集团第五工程有限公司 | Fabricated foundation pit supporting structure system for coastal soft soil subway |
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