CN114164839A - Foundation pit support device and construction method thereof - Google Patents
Foundation pit support device and construction method thereof Download PDFInfo
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- CN114164839A CN114164839A CN202111488460.XA CN202111488460A CN114164839A CN 114164839 A CN114164839 A CN 114164839A CN 202111488460 A CN202111488460 A CN 202111488460A CN 114164839 A CN114164839 A CN 114164839A
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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
Abstract
The invention relates to a foundation pit support device and a construction method thereof, wherein the foundation pit support device comprises an arch-shaped prefabricated wall body, a plurality of arch-shaped prefabricated wall bodies are used for enclosing a foundation pit, adjacent arch-shaped prefabricated wall bodies along the length direction or the width direction of the foundation pit are fixedly connected through a first prefabricated connecting assembly, and adjacent arch-shaped prefabricated wall bodies at the corners of the foundation pit are fixedly connected through a second prefabricated connecting assembly; adjacent arched prefabricated walls along the height direction of the foundation pit are fixedly connected through a third prefabricated connecting assembly, the upper end surface of the foundation pit is provided with a crown support through a first prefabricated connecting assembly and a second prefabricated connecting assembly, a plurality of inclined supporting assemblies are arranged in the foundation pit through the first prefabricated connecting assembly and the second prefabricated connecting assembly, and each arched prefabricated wall is provided with a tension rope assembly through the first prefabricated connecting assembly and/or the second prefabricated connecting assembly; the method is used for solving the risk that the enclosure structure deforms excessively and locally induces the collapse of the foundation pit when the foundation pit is excavated.
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
When underground space buildings such as subway stations and the like are constructed at present, a foundation pit supporting structure needs to be arranged, a planar underground continuous wall is generally adopted as an enclosure structure in a soft soil area, a crown brace and a steel brace are used as inner braces, and the underground space buildings are firstly supported and then dug; the supporting structure of the planar underground continuous wall and the inner support is utilized to resist the soil pressure and the water pressure generated by the soil outside the pit during the excavation of the foundation pit, 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 partitioned and layered mode, the planar underground continuous wall can generate horizontal deformation of the wall under the action of active soil pressure of a soil body outside the pit during the unsupported exposure period that the steel support is not installed and prestressed in time, so that a state that the foundation pit is not favorable for stability of the foundation pit and is deformed firstly and supported secondly is formed. (2) After the foundation pit is excavated, the plane underground diaphragm wall does not exert the soil arch effect, the soil pressure is in a semi-infinite form, and the numerical value is larger, so that the wall body is larger in thickness, higher in manufacturing cost and not very ideal in deformation control effect.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a foundation pit enclosure device suitable for a foundation pit of an underground station of urban rail transit and a construction method thereof, so as to solve the risk that the enclosure structure deforms excessively and locally induces foundation pit collapse during foundation pit excavation.
The invention aims to solve the technical scheme that the foundation pit support device comprises arched prefabricated walls, a plurality of arched prefabricated walls enclose a foundation pit, adjacent arched prefabricated walls along the length or width direction of the foundation pit are fixedly connected through a first prefabricated connecting assembly, and adjacent arched prefabricated walls at the corners of the foundation pit are fixedly connected through a second prefabricated connecting assembly; adjacent arched prefabricated walls along 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 and penetrate through the arched prefabricated walls are arranged along the height direction of the arched prefabricated walls; the upper end face of the foundation pit is provided with a crown support through a first prefabricated connecting assembly and a second prefabricated connecting assembly, a plurality of inclined supporting assemblies are arranged in the foundation pit through the first prefabricated connecting assembly and the second prefabricated connecting assembly, and the inclined supporting assemblies are arranged in a staggered mode along the height direction of the foundation pit and are located 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 invention has the beneficial effects that: adopt above-mentioned technical scheme, compared with the prior art, through setting up arch prefabricated wall body and enclosing into the continuous wall body of foundation ditch through each prefabricated coupling assembling, and install pulling force rope assembly on every arch prefabricated wall body, make the compressive property of arch prefabricated wall body better, simultaneously, install crown brace and diagonal bracing subassembly respectively at the continuous wall body of foundation ditch, make whole continuous wall body of foundation ditch when the foundation ditch excavation enclosure structure warp can in time and accurate push away to the continuous wall body of foundation ditch outward through the diagonal bracing subassembly, can reduce the risk that the foundation ditch warp and collapse.
Preferably, the first prefabricated connecting assembly comprises wall section joints, U-shaped steel and a supporting groove, the surface of each wall section joint, which faces the outer side of the foundation pit, is a W-shaped surface, two U-shaped steel are arranged and fixed on the W-shaped surfaces of the wall section joints respectively, the two 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 each U-shaped steel along the height direction of the foundation pit; the support grooves are three and are respectively fixed on the surface of the wall section joint facing the inner side of the foundation pit, two 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; mounting holes for mounting the tension rope assemblies are respectively formed in two side faces of the wall section joint, the plane of the mounting hole on the foundation pit and the plane of the support groove in the middle of the three support grooves on the foundation pit are in the same plane, and a grouting pipe which penetrates 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 and connection between the arched prefabricated wall bodies are more convenient along the adjacency of the length or width direction of the foundation pit, the structural stability is better, the installation of the inclined supporting assembly and the tension rope assembly is also convenient, and the stability of the continuous wall body of the foundation pit can be ensured.
Preferably, the second prefabricated connecting assembly comprises I-shaped steel and a support frame, the I-shaped steel connects the arched prefabricated wall bodies on two adjacent sides together, and a second welding rod is arranged on one end face of the I-shaped steel along the height direction of the foundation pit; the supporting frames are fixed between the arched prefabricated walls on two adjacent sides through bolt assemblies, the supporting frames are arranged at intervals along the height direction of the I-shaped steel, supporting grooves are fixed on the corner surfaces of the supporting frames facing the inner side of the foundation pit, and mounting holes for mounting the tension rope assemblies are respectively formed in two vertical joint surfaces of the supporting frames; a crown support frame is further arranged on the I-shaped 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-shaped steel; by adopting the technical scheme, the installation and connection between the adjacent arched prefabricated wall bodies at the corners of the foundation pit are more convenient, the structural stability is better, the installation of the inclined supporting assembly and the tension rope assembly is convenient, and the stability of the continuous wall body of the foundation pit can be ensured.
Preferably, the third prefabricated connecting assemblies are sequentially arranged at intervals along the length direction of the arch-shaped prefabricated wall bodies, each third prefabricated connecting assembly comprises a connecting ring and a connecting rod, the connecting rings are respectively arranged on the joint 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 in staggered distribution along the width direction of the arch-shaped prefabricated wall bodies, and the connecting rods are inserted among the connecting rings along the width direction of the arch-shaped prefabricated wall bodies after the upper arch-shaped prefabricated wall body and the lower arch-shaped prefabricated wall body are spliced; the edge is adjacent in foundation ditch direction of height the erection joint between the arch prefabricated wall body is more convenient, and the stability of structure is also 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 surfaces and/or the lower end surfaces of the arch-shaped prefabricated wall body and the wall section joint, grouting holes and grout outlet holes are formed in the groove walls of the grouting grooves, the grouting grooves are groove-shaped, and the groove walls of the grouting grooves are flush with 1/2 in the diameter of the connecting ring on the arch-shaped prefabricated wall body or the wall section joint; through above-mentioned structure for when cement thick liquid is injected through the slip casting pipe, flow in to the slip casting inslot more that can be quick, thereby make along foundation ditch direction of height is adjacent stability between the prefabricated wall body of arch is further strengthened.
Preferably, the tension rope assembly comprises a steel cable, a tension box and a piercing jack, the steel cable is inserted into the tension box, a wire outlet hole is formed in the tension box, and the piercing jack is arranged on one side of the tension box; each arch-shaped prefabricated wall body has better compression resistance under the action of the steel cable, the tension box and the center-penetrating jack.
Preferably, the inclined support assembly comprises a shaft rod and an elastic support mechanism, the elastic support mechanism comprises an olive-shaped pushing elastic assembly, a support block fixed to the end of the pushing elastic assembly and a pressing assembly for applying force to the pushing elastic assembly to push the support block to 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 support block and the end of the pushing elastic assembly through pulley assemblies respectively; 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 into the chest expander, and the chest expander is fixed on the other end of the pushing elastic assembly; through the arrangement of the olive-shaped pushing elastic assembly, 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, the supporting block pushes the side face 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 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 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.
A construction method adopting the foundation pit support device comprises the following steps:
firstly, digging a pit groove for placing an arched prefabricated wall on an unearthed foundation pit through a groove milling machine, and sequentially digging the pit groove on the unearthed foundation pit according to a groove jumping mode;
secondly, placing the first arched prefabricated wall body into the pit groove, splicing the upper end of the arched prefabricated wall body and the second arched prefabricated wall body which is pre-placed into the pit groove outside the foundation pit through a third prefabricated connecting assembly, sequentially placing the arched prefabricated wall bodies to be placed into the pit groove according to the splicing mode, injecting cement paste into the grouting grooves formed by splicing the upper arched prefabricated wall body and the lower arched prefabricated wall body through grouting pipes, and enabling the cement paste to flow out upwards from the bottoms of the arched prefabricated wall bodies along the two vertical sides through grout outlet holes in the grouting grooves, so that gaps between the two sides of the arched prefabricated wall bodies and soil bodies are filled;
thirdly, after the arch-shaped prefabricated wall bodies are placed in the pit grooves which are distributed at intervals and are sequentially excavated, excavating another pit groove for placing the arch-shaped prefabricated wall body between the pit grooves which are distributed at intervals, and placing the arch-shaped prefabricated wall body in the mode of the step 2;
fourthly, excavating a pit groove for placing a wall section joint between adjacent pit grooves in which the arched prefabricated wall body is placed, placing a first wall section joint with U-shaped steel into the pit groove, splicing the upper end of the wall section joint and a second wall section joint which is pre-placed into the pit groove outside the foundation pit through a third prefabricated connecting assembly, sequentially placing the wall section joints to be placed into the pit groove according to the splicing mode, injecting high-grade cement paste into the grouting grooves formed by splicing the upper wall section joint and the lower wall section joint through grouting pipes, and allowing the high-grade cement paste to flow out upwards from the bottom of the wall section joint along the vertical periphery through grout outlet holes in the grouting grooves so as to fill gaps between the periphery of the wall section joint and the soil body;
fifthly, after the arch-shaped prefabricated wall body and the wall section joint are placed along the length direction or the width direction of the un-excavated foundation pit, the arch-shaped prefabricated wall body is placed between the two pit grooves at the corners of the foundation pit through the step 2, the arch-shaped prefabricated wall body at one side is fixed with I-shaped steel, and the arch-shaped prefabricated wall body at the other side is placed along the I-shaped steel and the excavated foundation pit;
sixthly, sequentially performing the steps 1 to 5 until a continuous wall body of the foundation pit is surrounded;
seventhly, mounting a crown support at the uppermost end of the continuous wall body which surrounds the foundation pit, fixing one end of the crown support on a crown support frame on the I-shaped steel, and fixing a steel ring sleeve at the other end of the crown support and mounting the crown support on a wall section joint through the steel ring sleeve;
eighthly, along with excavation of a foundation pit in the foundation pit continuous wall body, placing oblique supporting components on supporting grooves in the wall section joint and supporting grooves in the I-shaped steel, simultaneously installing tension rope components, and placing the oblique supporting components in sequence along the direction of the supporting grooves in the wall section joint.
The invention has the beneficial effects that: by adopting the construction method of the foundation pit support device, the arched prefabricated wall bodies and the prefabricated connecting assemblies can be combined and surrounded into the continuous foundation pit wall body, the tension rope assemblies and the crown supports are arranged on each arched prefabricated wall body, and the continuous foundation pit wall body can be timely and accurately pushed outwards through the inclined supporting assemblies along with the gradual excavation of the foundation pit, so that the risks of deformation and collapse of the foundation pit can be reduced.
Drawings
Fig. 1 is a schematic view of a local structure of a foundation pit support device of the invention.
Fig. 2 is a schematic structural view of the arched prefabricated wall body, the first prefabricated connecting assembly and the tension rope assembly.
Fig. 3 is an enlarged schematic view of a portion a of fig. 2.
Fig. 4 is an enlarged schematic view of fig. 1 at C.
Fig. 5 is an enlarged schematic view of fig. 1 at B.
Fig. 6 is a perspective view of the diagonal support member of the present invention.
Fig. 7 is an enlarged schematic view of a portion a of fig. 6.
Fig. 8 is an enlarged schematic view of fig. 6 at B.
Fig. 9 is a schematic view of the bottom structure of the arched prefabricated wall body.
Figure 10 is a schematic view of a wall segment joint construction of the invention,
FIG. 11 is a structural diagram illustrating steps of the construction method of the present invention.
FIG. 12 is a schematic structural view of step two of the construction method of the present invention.
FIG. 13 is a schematic view of the construction method according to the present invention in three steps.
FIG. 14 is a schematic structural view of step four of the construction method of the present invention.
FIG. 15 is a schematic structural view of step four of the construction method of the present invention.
FIG. 16 is a schematic structural view of step five of the construction method of the present invention.
FIG. 17 is a six-step schematic construction diagram of the construction method of the present invention.
FIG. 18 is a schematic structural view of steps seven and eight of the construction method of the present invention.
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; 7. a grouting pipe; 8. a crown support; 9. a foundation pit; 10. an oblique support component; 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, a bracket; 100. an arch-shaped prefabricated wall body; 200. a tension cord assembly; 300. a first prefabricated connecting assembly; 400. a second prefabricated connecting component; 500. a third prefabricated connecting component; 600. a pit; 101. grouting grooves; 102. grouting holes; 103. a slurry outlet; 201. a steel cord; 202. a tension box; 203. a center-penetrating jack; 204. a wire outlet hole; 301. wall segment joints; 302. u-shaped steel; 303. a support groove; 304. a first welding rod; 305. a steel collar; 306. mounting holes; 401. i-shaped steel; 402. a support frame; 403. a crown support; 404. a second welding rod; 405. a trough body; 501. a connecting ring; 502. and (4) connecting the rods.
Detailed Description
The invention will be described in detail below with reference to the following drawings: as shown in fig. 1 to 5, the prefabricated wall comprises arch-shaped prefabricated walls 100, a foundation pit 9 is formed by surrounding a plurality of arch-shaped prefabricated walls 100, adjacent arch-shaped 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 arch-shaped prefabricated walls 100 at the corners of the foundation pit 9 are fixedly connected through a second prefabricated connecting assembly 400; adjacent arched prefabricated walls 100 in 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 and penetrate through the arched prefabricated walls 100 are arranged in the height direction of the arched prefabricated walls 100; the upper end face of the foundation pit 9 is provided with a crown support 8 through a first prefabricated connecting assembly 300 and a second prefabricated connecting assembly 400, a plurality of inclined supporting assemblies 10 are arranged in the foundation pit 9 through the first prefabricated connecting assembly 300 and the second prefabricated connecting assembly 400, and the inclined supporting assemblies 10 are arranged in a staggered mode along the height direction of the foundation pit 9 and are located below the crown support 8; each arched 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; compared with the prior art, the invention has the advantages that: the novel mode of arch underground continuous wall, pull rod support and pressure rod support is adopted, so that the good matching of a soil body-enclosure structure-support system is realized, and the stress effect of the support structure is better. The groove section of the arched underground diaphragm wall is in a combined structure form, the soil arch effect is fully utilized, and the groove section of the underground diaphragm wall is arranged to be arched from a plane shape, so that the horizontal soil pressure borne by the groove section of the arched underground diaphragm wall 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 semi-infinite soil pressure borne by the groove section of the plane-shaped underground diaphragm wall. The method not only reduces the soil pressure acting on the supporting structure, but also effectively utilizes the compressive strength of the soil body and the wall structure, reasonably utilizes the shearing force or bending moment minimization in the arch body, realizes the prior arch and later stress, actively overcomes the problem of wall deformation during the exposure period without support, reduces the vertical and horizontal deformation of the soil body around the foundation pit, and improves the overall stability of the foundation pit.
The first prefabricated connecting assembly 300 comprises wall section joints 301, U-shaped steels 302 and supporting grooves 303, wherein the surfaces, facing the outer side of the foundation pit 9, of the wall section joints 301 are W-shaped surfaces, the U-shaped steels 302 are provided with two parts and fixed on the W-shaped surfaces of the wall section joints 301 respectively, the two adjacent arched prefabricated walls 100 are connected together through the U-shaped steels 302, and a first welding rod 304 is arranged on one end surface of each U-shaped steel 302 in the height direction of the foundation pit 9; three support grooves 303 are arranged and are respectively fixed on the surface of the wall section joint 301 facing the inner side of the foundation pit, two support grooves 303 are positioned on the end corners of the wall section joint 301, and the three support grooves 303 are obliquely distributed along the height direction of the wall section joint 301; mounting holes 306 for mounting the tension rope assembly 200 are respectively formed in two side faces of the wall section joint 301, and a grouting pipe 7 which runs through the wall section joint along the height direction of the wall section joint 301 is arranged in the wall section joint 301; the connection surfaces of the adjacent wall section joints 301 in the height direction of the foundation pit are fixedly connected through a third prefabricated connection assembly 500, a connection ring 501 and a connection rod 502 are also arranged between the connection surfaces, the connection ring 501 between one wall section joint 301 and the other wall section joint 301 is in staggered distribution along the length direction of the wall section joint 301, the connection rod 502 is inserted between the connection rings 501 along the length direction of the arched prefabricated wall body 100, a grouting groove 101 is arranged on the upper end surface and/or the lower end surface of the wall section joint 301, and a grouting hole 102 and a grouting hole 103 are arranged on the groove wall of the grouting groove 101.
The second prefabricated connecting assembly 400 comprises an I-shaped steel 401 and a supporting frame 402, the I-shaped steel 401 connects the arched prefabricated wall bodies 100 on two adjacent sides together, and a second welding rod 404 is arranged on one end face of the I-shaped steel 401 in the height direction of the foundation pit 9; the support frames 402 are fixed between the arched 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-shaped steel 401, support grooves 303 are fixed on the corner surfaces 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 surfaces of the support frames 402; a crown support frame 403 is further arranged on the I-shaped 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 positioned above the support frame 402 on the I-shaped steel 401; the crown support frame 403 is provided with three groove bodies 405 for mounting the crown support 8, wherein two groove bodies 405 are positioned on two vertical joint surfaces of the crown support frame 403, and the other groove body is positioned on an end corner of the crown support frame 403.
The third prefabricated connecting assemblies 500 are sequentially arranged at intervals along the length direction of the arch-shaped prefabricated wall bodies 100, each third prefabricated connecting assembly 500 comprises a connecting ring 501, a connecting rod 502 and connecting rings 501, the connecting rings 501 are respectively arranged on the connecting 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 in staggered distribution along the width direction of the arch-shaped prefabricated wall bodies 100, and the connecting rods 502 are inserted between the connecting rings 501 along the width direction of the arch-shaped prefabricated wall bodies 100 after the upper and lower arch-shaped prefabricated wall bodies 100 are spliced.
The grouting pipes 7 are sequentially arranged at intervals along the length direction of the arched prefabricated wall 100, grouting grooves 101 are formed in the upper end surface and/or the lower end surface of the arched prefabricated wall 100 and the wall section joint 301, and the grouting grooves 101 in the arched prefabricated wall 100 and the grouting grooves 101 in the wall section joint 301 are respectively and independently distributed to prevent cement paste from being mixed together; and the wall of the grouting groove 101 is provided with a grouting hole 102 and a grout outlet hole 103 which are respectively positioned at two sides of the grouting groove 101; the grouting groove 101 is groove-shaped, 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 100 or the wall segment joint 301.
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 penetrated in the tension box 202, an outlet hole 204 is arranged 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 inclined support assembly 10 includes a shaft rod 1 and an elastic support mechanism 2, the elastic support mechanism 2 includes an olive-shaped pushing elastic assembly 5, a support block 3 fixed to an end of the pushing elastic assembly 5, a pressing assembly 4 for applying a force on the pushing elastic assembly 5 to push the support block 3 toward a side surface of the foundation pit, and the olive-shaped pushing elastic assembly 5 facilitates the opening and resetting of the pushing elastic assembly 5, and further enables the force application balance of the pushing elastic assembly 5 in the opening process to 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. 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 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.
A construction method of a foundation pit support device comprises the following steps: as shown in the accompanying figures 11 to 18,
firstly, digging a pit 600 for placing the arched prefabricated wall 100 on an unearthed foundation pit through a slot milling machine, and sequentially digging the pit 600 on the unearthed foundation pit according to a groove jumping mode;
secondly, placing the first arched prefabricated wall 100 into the pit slot 600, splicing the upper end of the arched prefabricated wall 100 and the second arched prefabricated wall 100 which is pre-placed into the pit slot 600 outside the foundation pit 9 through the third prefabricated connecting assembly 500, sequentially placing the arched prefabricated walls 100 which need 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 arched prefabricated wall 100 and the lower arched prefabricated wall 100 through the grouting pipes 7, and enabling the cement slurry to upwards flow out from the bottoms of the arched prefabricated walls 100 along the two vertical sides through the slurry outlet holes 103 in the grouting slots 101, so that gaps between the two sides of the arched prefabricated walls 100 and the soil body are filled; thereby further strengthening the side friction resistance of the outer edge diaphragm wall and the soil body and obviously improving the anti-settling capacity of the diaphragm wall;
thirdly, after the arch-shaped prefabricated wall bodies 100 are placed in the pit slots 600 which are distributed at intervals and are sequentially excavated, excavating another pit slot 600 for placing the arch-shaped prefabricated wall bodies 100 among the pit slots 600 which are distributed at intervals, and placing the pit slots 600 into the arch-shaped prefabricated wall bodies 100 in the mode of the step 2;
fourthly, digging pit grooves 600 for placing wall section joints between adjacent pit grooves 600 in which the arched prefabricated wall is placed, placing a first wall section joint 301 with U-shaped steel 302 into the pit groove 600, splicing the upper end of the wall section joint 301 and a second wall section joint 301 which is pre-placed into the pit groove outside the foundation pit through a third prefabricated connecting assembly 300, sequentially placing the wall section joints 301 which need to be placed into the pit grooves 600 according to the splicing mode, injecting high-grade cement slurry into the grouting grooves 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 slurry outlet holes 103 in the grouting grooves 101 so as to fill gaps between the periphery of the wall section joint 301 and the soil body; thereby further strengthening the side friction resistance between the wall section joint and the soil body and obviously improving the anti-settling capacity of the wall section joint;
fifthly, after the arch-shaped prefabricated wall body 100 and the wall section joint 301 are placed along the length direction or the width direction of the un-excavated foundation pit 9, the arch-shaped prefabricated wall body 100 is placed between the two pit slots 600 at the corners of the foundation pit through the step 2, the I-shaped steel 401 is fixed on the arch-shaped prefabricated wall body 100 at one side, and the arch-shaped prefabricated wall body 100 at the other side is placed along the I-shaped steel 401 and the excavated foundation pit 9;
sixthly, sequentially performing the steps 1 to 5 until a continuous wall body of the foundation pit is surrounded;
seventhly, a crown support 8 is arranged at the uppermost end of the continuous wall body which surrounds the foundation pit, one end of the crown support 8 is fixed on a crown support frame 403 on the I-shaped steel 401, and the other end of the crown support 8 is fixed with a steel ring sleeve 305 and is arranged on the wall section joint 301 through the steel ring sleeve 305;
eighthly, along with excavation of a foundation pit in the foundation pit continuous wall body, placing the inclined support assemblies 10 in the support grooves 303 on the wall section joint 301 and the support grooves 303 on the I-shaped steel 401, simultaneously installing the tension rope assemblies 200, and sequentially placing the inclined support assemblies 10 along the setting direction of the support grooves 303 on the wall section joint 301.
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 foundation pit enclosure device, includes arch prefabricated wall body (100) to enclose into a foundation pit (9) by a plurality of arch prefabricated wall bodies (100), its characterized in that: the adjacent arched prefabricated walls (100) along the length direction or the width direction of the foundation pit (9) are fixedly connected through a first prefabricated connecting assembly (300), and the adjacent arched prefabricated walls (100) at the corners of the foundation pit (9) are fixedly connected through a second prefabricated connecting assembly (400); adjacent arched 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 and penetrate through the arched prefabricated walls (100) are arranged along the height direction of the arched prefabricated walls (100); the upper end face of the foundation pit (9) is provided with a crown support (8) through a first prefabricated connecting assembly (300) and a second prefabricated connecting assembly (400), a plurality of inclined supporting assemblies (10) are arranged in the foundation pit (9) through the first prefabricated connecting assembly (300) and the second prefabricated connecting assembly (400), and the inclined supporting assemblies (10) are arranged in a staggered mode along the height direction of the foundation pit (9) and are located below the crown support (8); and each arched 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).
2. The foundation pit support apparatus of claim 1, wherein: the first prefabricated connecting assembly (300) comprises wall section joints (301), U-shaped steel (302) and supporting grooves (303), wherein the surface, facing the outer side of a foundation pit (9), of each wall section joint (301) is a W-shaped surface, the U-shaped steel (302) is provided with two U-shaped surfaces which are respectively fixed on the W-shaped surfaces of the wall section joints (301), the arched prefabricated wall bodies (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) in the height direction of the foundation pit (9); the three support grooves (303) are respectively fixed on the surface of the wall section joint (301) facing the inner side of the foundation pit, two support grooves (303) are positioned on the end corner of the wall section joint (301), and the three support grooves (303) are obliquely distributed along the height direction of the wall section joint (301); 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) which runs 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 sleeve ring (305) is further arranged on the wall section joint (301) along the height direction of the foundation pit (9) and positioned at the top end of the foundation pit (9).
3. The foundation pit support apparatus of claim 2, wherein: the second prefabricated connecting assembly (400) comprises I-shaped steel (401) and a supporting frame (402), the I-shaped steel (401) connects the arched prefabricated wall bodies (100) on two adjacent sides together, and a second welding rod (404) is arranged on one end face of the I-shaped steel (401) in the height direction of the foundation pit (9); the supporting frames (402) are fixed between the arched prefabricated walls (100) on two adjacent sides through bolt assemblies, the supporting frames (402) are arranged at intervals along the height direction of the I-shaped steel (401), supporting grooves (303) are fixed on the corner surfaces of the supporting 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 vertical joint surfaces of the supporting frames (402); still be equipped with crown support frame (403) along foundation ditch (9) direction of height and be located the foundation ditch top on I-steel (401), just crown support frame (403) are fixed on arch prefabricated wall body (100) and be located the top of support frame (402) on I-steel (401).
4. A foundation pit support apparatus according to claim 3, wherein: prefabricated coupling assembling of third (500) is arranged along the length direction of arch prefabricated wall body (100) interval in proper order, prefabricated coupling assembling of third (500) includes go-between (501), connective bar (502), go-between (501) set up respectively on the looks interface of adjacent arch prefabricated wall body (100) that set up along foundation ditch (9) direction of height, and go-between (501) between an arch prefabricated wall body (100) and another arch prefabricated wall body (100) are the staggered distribution along the width direction of arch prefabricated wall body (100), connective bar (502) two from top to bottom alternate between each go-between (501) along the width direction of arch prefabricated wall body (100) after arch prefabricated wall body (100) concatenation.
5. The foundation pit support apparatus of claim 4, wherein: slip casting pipe (7) are arranged along the length direction of arch prefabricated wall body (100) at interval in proper order, just arch prefabricated wall body (100) with all be equipped with slip casting groove (101) on the up end of wall section joint (301) and/or the terminal surface down, just be equipped with slip casting hole (102) and grout outlet (103) on the cell wall of slip casting groove (101), slip casting groove (101) are the recess form, just the cell wall of slip casting groove (101) is located the parallel and level with the diameter 1/2 of go-between (501) on arch prefabricated wall body (100) or wall section joint (301).
6. The foundation pit support apparatus of claim 1, wherein: the pull rope assembly (200) comprises a steel cable (201), a pull box (202) and a penetrating jack (203), wherein the steel cable (201) penetrates into the pull box (202), a wire outlet hole (204) is formed in the pull box (202), and the penetrating jack (203) is arranged on one side of the pull box (202).
7. The foundation pit support apparatus of claim 1, wherein: the inclined supporting assembly (10) comprises a shaft lever (1) and an elastic supporting mechanism (2), the elastic supporting mechanism (2) comprises an olive-shaped pushing elastic assembly (5), a supporting block (3) fixed to the end of the pushing elastic assembly (5) and a pressing assembly (4) used for applying force to the pushing elastic assembly (5) to enable the supporting block (3) to push towards the side face of the foundation pit, the shaft lever (1) is arranged along the central axis of the pushing elastic assembly (5), and two ends of the shaft lever (1) are connected to the end portions of the supporting block (3) and 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 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).
8. The foundation pit support apparatus of claim 7, 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.
9. The foundation pit support apparatus of claim 7, 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).
10. A construction method using the foundation pit support apparatus according to any one of claims 1 to 9, characterized in that: the construction method comprises the following steps:
firstly, digging a pit groove (600) for placing an arched prefabricated wall body (100) on an unearthed foundation pit through a groove milling machine, and sequentially digging the pit groove (600) on the unearthed foundation pit according to a groove jumping mode;
secondly, placing the first arched prefabricated wall body (100) into the pit groove (600), splicing the upper end of the arched prefabricated wall body (100) and the second arched prefabricated wall body (100) which is pre-placed into the pit groove (600) outside the foundation pit (9) through a third prefabricated connecting assembly (500), sequentially placing the arched prefabricated wall bodies (100) to be placed into the pit groove (600) according to the splicing mode, injecting cement slurry into the grouting grooves (101) formed by splicing the upper arched prefabricated wall body and the lower arched prefabricated wall body (100) through grouting pipes (7), and enabling the cement slurry to upwards flow out from the bottoms of the arched prefabricated wall bodies (100) along the two vertical sides through slurry outlet holes (103) in the grouting grooves (101) so as to fill gaps between the two sides of the arched prefabricated wall bodies (100) and soil bodies;
thirdly, after the arch-shaped prefabricated walls (100) are placed in the pit grooves (600) to be sequentially excavated at intervals, excavating another pit groove (600) for placing the arch-shaped prefabricated walls (100) between the pit grooves (600) at intervals, and placing the arch-shaped prefabricated walls (100) in the step 2;
fourthly, excavating pit grooves (600) used for placing wall section joints between adjacent pit grooves (600) placed with the arched prefabricated wall, and a first wall segment joint (301) with U-shaped steel (302) is placed in the pit (600), and the upper end of the wall section joint (301) is spliced with a second wall section joint (301) which is pre-placed into the pit groove through a third prefabricated connecting component (300) outside the foundation pit, then the wall segment joints (301) required to be put are sequentially put into the pit slot (600) according to the splicing mode, high-grade cement paste is injected into a grouting groove (101) formed by splicing an upper wall section joint (301) and a lower wall section joint (301) through a grouting pipe (7), and the high-grade cement paste flows out upwards from the bottom of the wall section joint (301) along the vertical periphery through a paste outlet hole (103) in the grouting groove (101), so that a gap between the periphery of the wall section joint (301) and a soil body is filled;
fifthly, after the arched prefabricated wall body (100) and the wall section joint (301) are placed along the length direction or the width direction of the un-excavated foundation pit (9), the arched prefabricated wall body (100) is placed between two pit grooves (600) at the corners of the foundation pit through the step 2, the I-shaped steel (401) is fixed on the arched prefabricated wall body (100) on one side, and the arched prefabricated wall body (100) on the other side is placed along the I-shaped steel (401) and the excavated foundation pit (9);
sixthly, sequentially performing the steps 1 to 5 until a continuous wall body of the foundation pit is surrounded;
seventhly, a crown support (8) is installed at the uppermost end of the continuous wall body which surrounds the foundation pit, one end of the crown support (8) is fixed on a crown support frame (403) on the I-shaped steel (401), and the other end of the crown support (8) is fixed with a steel ring sleeve (305) and is installed on the wall section joint (301) through the steel ring sleeve (305);
eighthly, along with excavation of a foundation pit in the foundation pit continuous wall body, placing the inclined support assemblies (10) in the support grooves (303) on the wall section joint (301) and the support grooves (303) on the I-shaped steel (401), installing the tension rope assemblies (200) simultaneously, and sequentially placing the inclined support assemblies (10) along the support grooves (303) on the wall section joint (301).
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| CN113958010A (en) * | 2021-11-23 | 2022-01-21 | 山东工艺美术学院 | Wall body jointing equipment for indoor design of fabricated building |
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