CN111395395A - Installation process of subway deep foundation pit cover excavation lower supporting system - Google Patents
Installation process of subway deep foundation pit cover excavation lower supporting system Download PDFInfo
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- CN111395395A CN111395395A CN202010320491.3A CN202010320491A CN111395395A CN 111395395 A CN111395395 A CN 111395395A CN 202010320491 A CN202010320491 A CN 202010320491A CN 111395395 A CN111395395 A CN 111395395A
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 45
- 238000011900 installation process Methods 0.000 title claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 198
- 239000010959 steel Substances 0.000 claims abstract description 198
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 238000010276 construction Methods 0.000 claims description 16
- 238000009434 installation Methods 0.000 claims description 16
- 238000013461 design Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 230000032258 transport Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
- E02D29/055—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel
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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
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
- E02D5/765—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor removable
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- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a mounting process of a cover excavation lower supporting system of a subway deep foundation pit, which comprises a steel supporting piece mounted on a cover plate of a foundation pit, wherein L-shaped bolts are pre-buried at the bottom of the cover plate of the foundation pit, an I-shaped steel rail of an electric hoist is fixed through L-shaped bolts, the steel supporting piece is conveyed to a specified position through the electric hoist, a reversed V-shaped lifting hook is pre-buried on the cover plate, the number of the lifting hooks is at least two, the lifting hooks are uniformly distributed, a lifting hook is pre-buried on the cover plate at the position of each standard section of the steel supporting, a supporting bracket is mounted on a surrounding structure of the foundation pit, the supporting bracket is arranged below the steel supporting piece, and the movable end of the supporting bracket is fixed through a stopper iron, so that the safety is ensured, the cost is saved, the mounting.
Description
Technical Field
The invention belongs to the technical field of engineering construction, and particularly relates to a mounting process of a cover excavation lower supporting system of a subway deep foundation pit.
Background
At present, with the development of urban rail transit and the restriction of urban traffic environment, in order to solve the contradiction between the construction land and the construction period requirement of an urban subway station and the surrounding environment, a method combining an open excavation method and a cover excavation method appears, but due to the influence of a cover plate of a cover excavation part and a limited space, a steel support cannot be vertically placed and installed, the erection difficulty is high, the implementation is difficult, and the safety risk is large. And the steel support installation under the cover excavation section adopts the two excavators to lift and hang the segmentation installation, and it requires two excavators to cooperate tacit, and overall cost is high, and the risk is big, and is efficient.
Disclosure of Invention
The invention provides a mounting process of a cover-excavation lower supporting system of a subway deep foundation pit, which solves the problems of high steel support mounting risk and long time consumption in a cover-excavation construction process caused by site condition restriction and process self defects in the prior art.
The invention provides a mounting process of a cover excavation lower supporting system of a subway deep foundation pit, which comprises the following steps,
firstly, construction preparation, namely preparing a steel support member (1) according to the size of a foundation pit (5) before excavation, checking and accepting the steel support member (1) after the steel support member enters a construction site, and performing trial assembly;
secondly, installing a conveying device of the steel support member (1), embedding L-shaped bolts (2) at the bottom of a cover plate (4) of a foundation pit (5), installing an I-shaped steel rail (6) and an electric hoist in the foundation pit (5), fixing the I-shaped steel rail (6) of the electric hoist through L-shaped bolts (2), excavating to the installation position of the steel support member (1), hanging the steel support member (1) into the foundation pit by a crane, then conveying the steel support member (1) to a specified position by using the electric hoist, and assembling and installing the steel support member (1);
thirdly, pre-burying lifting hooks (3), wherein the n-shaped lifting hooks (3) are pre-buried on the cover plate (4) to install the steel support piece (1), and the number of the lifting hooks (3) is at least two and is uniformly distributed;
fourthly, mounting a support bracket, performing measurement paying-off and supporting positioning work according to a design drawing when the earth of the foundation pit (5) is excavated to a preset distance below the mounting surface of the corresponding steel support member (1), and then mounting the support bracket on the enclosure structure (501) of the foundation pit (5);
fifthly, pre-assembling the steel support piece (1), measuring the actual distance between the pre-embedded steel plates of the ground connection wall, and then supporting according to the length of a steel support standard knot (101) of the steel support piece (1), the telescopic length of a movable end (103) of the steel support piece (1) and the position of a pre-embedded lifting hook (3);
sixthly, hanging the assembled steel support piece (1) into an installation position in sections, disassembling the pre-assembled steel support piece (1), then respectively hanging the steel support piece into a foundation pit (5) by using a truck crane, then conveying the steel support piece to a specified position by using a conveying device of the steel support piece (1), and installing the steel support piece (1), wherein a lifting hook (3) is pre-embedded on a cover plate (4) at the position of each standard steel support section (101);
seventhly, mounting a steel support member (1), determining the lifting tonnage of the chain block (7) according to the maximum weight of the steel support standard knot (101), hanging the chain block (7) on a lifting hook (3) pre-embedded on a cover plate (4), pulling one end of a pull rope of the chain block (7) to pull the support end part (101) of the steel support member (1), adjusting the height of the steel support standard knot (101) by retracting the chain block (7), adjusting the splicing angle of the support by adopting the matching of an excavator, aligning bolt holes on the steel support members (1), and connecting the steel support members (1) to the whole steel support member (1) to finish the mounting;
and eighthly, pre-applying axial force, applying the axial force by using a jack after the steel support piece (1) is installed, and fixing the movable end (103) by using a stopper iron.
In the above solution, it is preferable that the cover plate (4) is a cover-dug segment top plate.
It is also preferable that the top plate of the cover-digging section is bound and fixed by steel bars.
It is also preferable that the hook (3) is bound to the main rib (502) of the cover plate (4).
It is also preferable that the embedded L-shaped bolts (2) are arranged side by side on two sides of the central line of the I-shaped steel rail (6).
It is also preferable that the bottom of the longitudinal part of the "L" shaped bolt (2) is fitted with a pre-embedded nut (201).
It is also preferred that the electric block is mounted on an i-steel rail (6).
It is also preferable that the lifting hook (3) is made of round steel, and two ends of the round steel are of a hook structure bent in a semicircular arc shape.
Preferably, the supporting system comprises a steel supporting piece (1) arranged below a cover plate (4) of a foundation pit (5), the steel supporting piece (1) is composed of steel supporting standard joints (101), screw holes are formed in the end portions of the steel supporting standard joints (101), a fixed end (102) and a movable end (103) are arranged at two ends of the steel supporting piece (1) respectively, L-shaped bolts (2) are embedded in the bottom of the cover plate (4) of the foundation pit (5), I-shaped steel rails (6) of an electric hoist are fixed through L-shaped bolts (2), the steel supporting piece (1) is conveyed to a specified position through the electric hoist, n-shaped hooks (3) are embedded in the cover plate (4), the hooks (3) are at least two and are uniformly distributed, one hook (3) is embedded in the cover plate (4) at the position of each steel supporting standard joint (101), a supporting bracket is arranged on a support structure (501) of the foundation pit (5), the supporting bracket is arranged below the steel supporting piece (1), and the movable end (103) is fixed through a stopper iron.
It is also preferable that the conveying device comprises an I-shaped steel rail (6) and an electric hoist which are installed in a foundation pit (5), the I-shaped steel rail is excavated to the installation position of the steel support member (1), a crane is used for hoisting the steel support member (1) into the foundation pit, then the electric hoist is used for conveying the steel support member (1) to the specified position, and the steel support member (1) is assembled and installed.
The invention can achieve the following beneficial effects:
the mounting process of the subway deep foundation pit cover-excavation lower support system solves the problems of large steel support mounting risk and long time consumption under the cover-excavation construction process caused by site condition restriction and process self defects in the prior art, improves the mounting process of the steel support under the subway deep foundation pit cover-excavation limited space, effectively saves the mechanical equipment cost required by double-excavator lifting and hanging mounting on the premise of ensuring safety, improves the mounting efficiency of the steel support under the cover-excavation section, ensures the construction progress of the whole project, obtains good effects, and is particularly suitable for mounting the steel support under the same type of subway deep foundation pit cover-excavation limited space.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flow chart of the installation process of the underground deep foundation pit cover excavation lower supporting system of the invention.
Fig. 2 is a schematic elevation view of a cover plate pre-buried L-shaped bolt and an i-steel rail of the installation process of the subway deep foundation pit cover excavation lower support system.
Fig. 3 is a schematic plane position diagram of a cover plate pre-buried L-shaped bolt and an i-steel rail of the installation process of the subway deep foundation pit cover excavation lower support system.
Fig. 4 is a distribution diagram of the positions of embedded hooks of the installation process of the underground deep foundation pit cover excavation lower supporting system.
Fig. 5 is a rough drawing of an embedded hook of the installation process of the underground deep foundation pit cover excavation lower supporting system.
Fig. 6 is an installation schematic view of a movable end of a steel support member of the installation process of the subway deep foundation pit cover excavation lower support system of the invention.
Fig. 7 is an installation schematic view of a fixed end of a steel support member of the installation process of the subway deep foundation pit cover excavation lower support system of the invention.
The steel support structure comprises a steel support member 1, a steel support standard knot 101, a fixed end 102, a movable end 103, a bolt 2 in the shape of L, a pre-embedded nut 201, a gasket 202, a lifting hook 3, a cover plate 4, a foundation pit 5, a support structure 501, a main rib 502, an I-shaped steel rail 6 and a chain block 7.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
A process for installing a cover excavation lower supporting system of a subway deep foundation pit, which is shown in figure 1, comprises the following steps,
firstly, construction preparation, namely preparing a steel support member 1 according to the size of a foundation pit 5 before excavation, checking and accepting the steel support member 1 after the steel support member enters a construction site, and performing trial assembly;
secondly, installing a conveying device of the steel support member 1, referring to fig. 2 and 3, embedding L-shaped bolts 2 at the bottom of a cover plate 4 of a foundation pit 5, installing an I-shaped steel rail 6 and an electric hoist in the foundation pit 5, fixing the I-shaped steel rail 6 of the electric hoist through L-shaped bolts 2, excavating to the installation position of the steel support member 1, hoisting the steel support member 1 into the foundation pit by a crane, then conveying the steel support member 1 to a specified position by using the electric hoist, and assembling and installing the steel support member 1;
thirdly, embedding hooks 3, referring to fig. 4 and 5, embedding the inverted V-shaped hooks 3 on the cover plate 4 to install the steel support members 1, wherein the number of the hooks 3 is at least two and the hooks are uniformly distributed;
fourthly, mounting a support bracket, performing measurement paying-off and supporting positioning work according to a design drawing when the earth of the foundation pit 5 is excavated to a preset distance below the mounting surface of the corresponding steel support member 1, and then mounting the support bracket on the enclosure structure 501 of the foundation pit 5;
fifthly, pre-assembling the steel support member 1, measuring the actual distance between the embedded steel plates of the underground diaphragm wall, and then supporting according to the length of the steel support standard knot 101 of the steel support member 1, the telescopic length of the movable end 103 of the steel support member 1 and the position of the embedded lifting hook 3;
sixthly, hanging the assembled steel support piece 1 into an installation position in sections, disassembling the pre-assembled steel support piece 1, then respectively hanging the steel support piece into a foundation pit 5 by using a truck crane, then conveying the steel support piece 1 to a specified position by using a conveying device of the steel support piece 1, and installing the steel support piece 1, wherein a lifting hook 3 is pre-embedded on a cover plate 4 at the position of each steel support standard joint 101;
seventhly, mounting the steel support member 1, determining the lifting tonnage of the chain block 7 according to the maximum weight of the steel support standard knot 101, hanging the chain block 7 on a lifting hook 3 pre-embedded on the cover plate 4, pulling the supporting end part 101 of the steel support member 1 by one end of a pulling rope of the chain block 7, adjusting the height of the steel support standard knot 101 by retracting the chain block 7, adjusting the splicing angle of the support by adopting a digging machine in a matching way, aligning bolt holes on the steel support members 1, and connecting the steel support members 1 to the whole steel support member 1 to finish the mounting;
and eighthly, pre-applying axial force, referring to fig. 6, applying the axial force by using a jack after the steel support piece 1 is installed, and fixing the movable end 103 by using a stopper iron.
The embedded steel plate is embedded during the construction of the diaphragm wall, and the steel support member 1 is erected at the position after the foundation pit 5 is excavated to the position of the steel support member 1.
Example 2
A mounting process of a cover-excavation lower supporting system of a subway deep foundation pit is similar to that in embodiment 1, except that a cover plate 4 is a cover-excavation section top plate.
Still further, the cover digging section top plate is bound and fixed through steel bars.
Further, the hook 3 may be bound to the main rib 502 of the cover 4.
Furthermore, the embedded L-shaped bolts 2 can be arranged side by side on two sides of the central line of the I-shaped steel rail 6.
Further, the bottom of the longitudinal part of the "L" bolt 2 is provided with a pre-embedded nut 201.
Still further, the electric hoist is mounted on the I-steel rail 6.
Still further, the lifting hook 3 is made of round steel, and the two ends of the round steel are of a hook structure bent in a semicircular arc shape.
Example 3
A technology for installing a cover excavation lower supporting system of a subway deep foundation pit is similar to the above embodiment, and is different in that the supporting system comprises a steel supporting piece 1 installed below a cover plate 4 of a foundation pit 5, the steel supporting piece 1 is composed of steel supporting standard joints 101, screw holes are formed in the end portions of the steel supporting standard joints 101, referring to fig. 7, two ends of the steel supporting piece 1 are respectively provided with a fixed end 102 and a movable end 103, L-shaped bolts 2 are pre-embedded in the bottom of the cover plate 4 of the foundation pit 5, I-shaped steel rails 6 of an electric hoist are fixed through L-shaped bolts 2, the steel supporting piece 1 is conveyed to a specified position through the electric hoist, at least two lifting hooks 3 are pre-embedded in the cover plate 4, the lifting hooks 3 are evenly distributed, a lifting hook 3 is pre-embedded in the cover plate 4 at the position of each steel supporting standard joint 101, a supporting bracket is installed on a support structure 501 of the foundation pit 5, the supporting bracket is arranged below the steel supporting piece 1, and the movable end.
Example 4
The utility model provides a subway deep basal pit lid excavates under bracing system mounting process, is similar with above-mentioned embodiment, and the difference is that conveyor is including installing I-steel track 6 and the electric block in foundation ditch 5, excavates to the mounted position of steel support piece 1, and the crane hangs steel support piece 1 into the foundation ditch, then uses electric block transports steel support piece 1 to the assigned position to assemble and install steel support piece 1.
It is further possible that the height of the hook 3 is larger than the distance between the main rib 502 of the top plate and the main rib 502 of the bottom plate of the cover plate 4.
The installation process of the subway deep foundation pit cover excavation lower support system comprises the steps that in the first step of construction preparation, a steel support piece 1 is prepared according to the size of a foundation pit 5 before excavation, the steel support piece 1 can be comprehensively checked and accepted after entering a construction site, trial assembly is carried out, the steel support piece 1 is not accurately used according to requirements, a jack for prestressing the steel support piece 1 can be calibrated before use, a corresponding test report is shown by a test unit, in the second step of transportation device for installing the steel support piece 1, for the convenience of transportation of the steel support piece 1 under the limited space of a covered section, the adopted transportation device is used for lifting a pre-buried bolt 2 in a shape of L before a cover plate 4, the outer diameter of the pre-buried bolt 2 in the shape of L can be a phi 24 and installing an I-steel rail 6 and an electric hoist, after the installation position of the steel support piece 1 is excavated, the steel support standard section 101 is hoisted into the foundation pit 5, then the steel support piece 1 is transported to the specified position by using the electric hoist, the steel support piece 1 is transported to the specified position, and the steel support piece 1 is transported to the steel support section 1, the steel support piece 1, when the bolt of the lifting hook 3 is excavated to be installed, the lifting hook 3, the lifting hook 1, the lifting hook 3, the steel support piece 1, the lifting hook 3 is transported to the steel support piece 1, the lifting device, the steel support section, the steel support piece 1, the lifting device is transported to the lifting device, the steel support piece 1, the lifting hook 3, the lifting device is transported to the lifting device, the lifting of the lifting hook 1, the lifting device is transported to the lifting device, the lifting device is transported to the lifting device, the lifting hook 1, the lifting device, the lifting hook 3, the lifting device is transported to the lifting device, the lifting device to be installed, the lifting device, the lifting hook 3, the lifting device to be installed, the lifting hook 3, the lifting device.
The method comprises the steps of firstly, measuring the length of a lifting hook 1, a lifting hook 3, a lifting hook 5, a lifting hook 7, a lifting hook 5, a lifting hook 7, a lifting hook 5, a lifting hook 3, a lifting hook 7, a lifting hook 5, a lifting hook 3, a lifting hook 5, a lifting hook 7, a lifting hook 3, a lifting hook 5, a lifting hook 3, a lifting hook 7, a lifting hook 3, a lifting hook 5, a lifting hook 3, a lifting hook 5, a lifting hook 1, a lifting hook 3, a lifting hook 1, a lifting hook 5, a lifting hook 1, a lifting hook 5, a lifting hook 3, a lifting rod 1, a lifting hook 5, a lifting rod 1, a lifting rod 2, a lifting rod 1, a lifting rod 7, a lifting rod 2, a lifting rod 7, a lifting rod 1, a lifting rod 7, a lifting rod 2, a lifting rod 1, a rod 2, a lifting rod 2, a lifting rod 1, a lifting rod, a rod 1, a rod, a lifting rod 2, a rod 1, a rod 2, a rod 1, a rod 2, a rod 1, a rod 7, a rod 2, a rod 1, a rod 2, a rod 1, a rod 2, a rod 1, a rod 7, a rod 2, a rod 1, a rod 2, a rod 1, a rod 2, a rod 7, a rod 1, a rod 2, a rod 1, a rod 2, a rod 1, a rod 2, a rod 1, a rod 2, a rod 1, a rod 2, a rod 1, a rod 2, a rod 1, a rod 1, a rod 1, a rod 2, a rod 1, a rod 7, a rod 1, a rod 7, a rod 1, a rod 7, a rod 1, a rod 2, a rod 1, a rod 7, a rod 1, a rod 7, a rod 1, a rod 7, a rod 1.
The installation process of the subway deep foundation pit cover excavation lower supporting system of the embodiment effectively saves the cost of mechanical equipment required by the lifting installation of the double excavator on the premise of ensuring safety, improves the installation efficiency of the steel supporting piece 1 under the cover excavation section, ensures the construction progress of the whole project, obtains good effect, and is particularly suitable for the installation of the steel supporting piece 1 under the same type of subway deep foundation pit cover excavation limited space.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A mounting process of a cover excavation lower supporting system of a subway deep foundation pit is characterized by comprising the following steps,
firstly, construction preparation, namely preparing a steel support member (1) according to the size of a foundation pit (5) before excavation, checking and accepting the steel support member (1) after the steel support member enters a construction site, and performing trial assembly;
secondly, installing a conveying device of the steel support member (1), embedding L-shaped bolts (2) at the bottom of a cover plate (4) of a foundation pit (5), installing an I-shaped steel rail (6) and an electric hoist in the foundation pit (5), fixing the I-shaped steel rail (6) of the electric hoist through L-shaped bolts (2), excavating to the installation position of the steel support member (1), hanging the steel support member (1) into the foundation pit by a crane, then conveying the steel support member (1) to a specified position by using the electric hoist, and assembling and installing the steel support member (1);
thirdly, pre-burying lifting hooks (3), wherein the n-shaped lifting hooks (3) are pre-buried on the cover plate (4) to install the steel support piece (1), and the number of the lifting hooks (3) is at least two and is uniformly distributed;
fourthly, mounting a support bracket, performing measurement paying-off and supporting positioning work according to a design drawing when the earth of the foundation pit (5) is excavated to a preset distance below the mounting surface of the corresponding steel support member (1), and then mounting the support bracket on the enclosure structure (501) of the foundation pit (5);
fifthly, pre-assembling the steel support piece (1), measuring the actual distance between the pre-embedded steel plates of the ground connection wall, and then supporting according to the length of a steel support standard knot (101) of the steel support piece (1), the telescopic length of a movable end (103) of the steel support piece (1) and the position of a pre-embedded lifting hook (3);
sixthly, hanging the assembled steel support piece (1) into an installation position in sections, disassembling the pre-assembled steel support piece (1), then respectively hanging the steel support piece into a foundation pit (5) by using a truck crane, then conveying the steel support piece to a specified position by using a conveying device of the steel support piece (1), and installing the steel support piece (1), wherein a lifting hook (3) is pre-embedded on a cover plate (4) at the position of each standard steel support section (101);
seventhly, mounting a steel support member (1), determining the lifting tonnage of the chain block (7) according to the maximum weight of the steel support standard knot (101), hanging the chain block (7) on a lifting hook (3) pre-embedded on a cover plate (4), pulling one end of a pull rope of the chain block (7) to pull the support end part (101) of the steel support member (1), adjusting the height of the steel support standard knot (101) by retracting the chain block (7), adjusting the splicing angle of the support by adopting the matching of an excavator, aligning bolt holes on the steel support members (1), and connecting the steel support members (1) to the whole steel support member (1) to finish the mounting;
and eighthly, pre-applying axial force, applying the axial force by using a jack after the steel support piece (1) is installed, and fixing the movable end (103) by using a stopper iron.
2. The installation process of the cover excavation lower support system of the subway deep foundation pit as claimed in claim 1, wherein the cover plate (4) is a cover excavation section top plate.
3. The installation process of the cover excavation lower support system of the subway deep foundation pit as claimed in claim 2, wherein the top plate of the cover excavation section is bound and fixed by steel bars.
4. The installation process of the cover excavation lower support system of the subway deep foundation pit as claimed in claim 3, wherein the lifting hook (3) is bound with the main rib (502) of the cover plate (4).
5. The installation process of the cover excavation lower support system of the subway deep foundation pit as claimed in claim 1, wherein the pre-buried L-shaped bolts (2) are installed side by side on two sides of the center line of the I-steel rail (6).
6. The installation process of the under-cover support system for the deep foundation pit of the subway as claimed in claim 5, wherein the embedded nut (201) is installed at the bottom of the longitudinal part of the "L" shaped bolt (2).
7. The installation process of the under-cover support system for the deep foundation pit of the subway as claimed in claim 5, wherein said electric block is installed on the I-steel rail (6).
8. The installation process of the underground deep foundation pit cover excavation lower supporting system according to claim 1, wherein the lifting hook (3) is made of round steel, and two ends of the round steel are of a hook structure with semicircular arc bends.
9. The installation process of the cover excavation support system of the subway deep foundation pit as claimed in claim 1, wherein the support system comprises a steel support member (1) installed below a cover plate (4) of a foundation pit (5), the steel support member (1) is composed of steel support standard joints (101), screw holes are formed in the end portions of the steel support standard joints (101), fixed ends (102) and movable ends (103) are respectively arranged at two ends of the steel support member (1), L-shaped bolts (2) are embedded in the bottom of the cover plate (4) of the foundation pit (5), I-shaped steel rails (6) of the electric block are fixed through L-shaped bolts (2), the steel support member (1) is conveyed to a specified position through the electric block, a plurality of n-shaped hooks (3) are embedded in the cover plate (4), the number of the hooks (3) is at least two and are uniformly distributed, a hook (3) is arranged on the cover plate (4) at the position of each steel support standard joint (101), a support bracket (501) is installed on a support structure (1) embedded in the foundation pit (5), and a plug end of the iron is fixed end (103).
10. The installation process of the under-cover-excavation support system of the subway deep foundation pit as claimed in claim 1, wherein the conveying device comprises an I-shaped steel rail (6) and an electric hoist which are installed in a foundation pit (5), the steel support (1) is excavated to the installation position of the steel support (1), a crane lifts the steel support (1) into the foundation pit, then the electric hoist is used for conveying the steel support (1) to the specified position, and the steel support (1) is assembled and installed.
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| CN112240025A (en) * | 2020-10-21 | 2021-01-19 | 上海隧道工程有限公司 | Station foundation pit engineering cover-excavation construction method |
| CN113493163A (en) * | 2021-07-20 | 2021-10-12 | 中煤第三建设（集团）有限责任公司 | Transportation and installation system and method for large steel structure for half-covered excavation construction of subway station |
| CN115324067A (en) * | 2022-07-23 | 2022-11-11 | 北京城乡建设集团有限责任公司 | Half lid digs device of accurate location installation steel shotcrete |
| CN115928756A (en) * | 2023-02-03 | 2023-04-07 | 中国电建集团贵阳勘测设计研究院有限公司 | Foundation pit combined supporting structure based on adjacent deep foundation pit compact construction |
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| CN112240025A (en) * | 2020-10-21 | 2021-01-19 | 上海隧道工程有限公司 | Station foundation pit engineering cover-excavation construction method |
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| CN115928756A (en) * | 2023-02-03 | 2023-04-07 | 中国电建集团贵阳勘测设计研究院有限公司 | Foundation pit combined supporting structure based on adjacent deep foundation pit compact construction |
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