CN111255462B - Pipe curtain cover excavation top-down construction method for subway station construction - Google Patents

Pipe curtain cover excavation top-down construction method for subway station construction Download PDF

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Publication number
CN111255462B
CN111255462B CN202010044059.6A CN202010044059A CN111255462B CN 111255462 B CN111255462 B CN 111255462B CN 202010044059 A CN202010044059 A CN 202010044059A CN 111255462 B CN111255462 B CN 111255462B
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China
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construction
station
pipe curtain
excavation
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CN111255462A (en
Inventor
周清才
吴浩
王宁
赵广波
肖红龙
李长山
杨芬芬
杨学刚
许海强
刘宝
李蒙
王超
范中原
马红录
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China Railway Seventh Group Co Ltd
Xian Railway Engineering Co Ltd of China Railway Seventh Group Co Ltd
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China Railway Seventh Group Co Ltd
Xian Railway Engineering Co Ltd of China Railway Seventh Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/045Underground 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
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/38Waterproofing; Heat insulating; Soundproofing; Electric insulating

Abstract

The invention discloses a pipe curtain cover excavation top-down construction method for subway station construction, which comprises the following steps of firstly adopting a cover excavation mode to excavate a right line or a left line of a subway station; after the right line or the left line of the subway station is covered and excavated to a preset position, jacking a pipe curtain from the excavated line to the non-excavated line to form a shed cover structure; excavating soil below the shed cover structure to provide a working surface for a construction top plate; then, sequentially constructing each floor beam of the station by adopting a cover-excavation top-down construction method; the supporting function of the transverse pipe curtain structure is utilized, the constant load of the soft soil body of the water-rich sand layer above the transverse pipe curtain structure and the live load of the pedestrians in the travelling crane are borne, meanwhile, the complex underground pipelines in the overlying soil body can be effectively avoided, and inconvenience brought to pedestrian traffic by excessively occupying the ground is avoided.

Description

Pipe curtain cover excavation top-down construction method for subway station construction
Technical Field
The invention belongs to the technical field of engineering, and particularly relates to a pipe curtain cover excavation top-down construction method for subway station construction.
Background
At present, in the construction of subway stations, common methods include open cut method, cover cut method, mine method, reverse construction method and the like; the construction of urban subway stations is limited by a plurality of factors, such as ground settlement caused by the fact that important buildings need to be strictly controlled on the ground, more underground pipelines which cannot be damaged, and no excessive enclosure of busy ground traffic. Therefore, when a construction method for constructing a subway station is selected, there are many problems, such as traffic congestion and influence on the surrounding environment due to the open cut method, problems of low construction efficiency and incapability of avoiding important pipelines due to the pure reverse method, and large working space requirements for the pipe curtain method and the pipe jacking method.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a pipe curtain cover excavation top-down construction method for subway station construction, which aims to solve the technical problems that traffic is congested and the surrounding environment is influenced by adopting an open excavation method, the construction efficiency is low and important pipelines cannot be avoided by adopting a top-down construction method and a larger working space is needed by adopting a pipe curtain method and a pipe jacking method in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a pipe curtain cover excavation top-down construction method for subway station construction, which adopts a cover excavation mode to excavate a right line or a left line of a subway station; after the right line or the left line of the subway station is covered and excavated to a preset position, jacking a pipe curtain from the excavated line to the non-excavated line to form a shed cover structure; excavating soil below the shed cover structure to provide a working surface for a construction top plate; and then, sequentially constructing each floor beam of the station by adopting a cover-excavation top-down construction method.
Further, the method specifically comprises the following steps:
step 1, performing ground traffic enclosure on a right line or a left line of a subway station, and constructing groove wall reinforced mixing piles on two sides of the right line or the left line of the subway station; building isolation pile construction is carried out on the right side of the right line or the left side of the left line of the station;
step 2, constructing the steel pipe column and the pile foundation of the station;
step 3, constructing underground continuous walls on two sides of the right line or the left line of the station; constructing a station right line or left line cover plate;
step 4, guiding and modifying ground traffic; carrying out construction of reinforcing and stirring piles on the left line or right line slot wall of the station and an underground continuous wall;
5, recovering ground traffic, and carrying out top-down construction of covering and digging on the right line or the left line of the station;
6, after the reverse construction of a layer carried on the right line or the left line of the station is finished, carrying out jacking construction on the transverse pipe curtain structure on the left line or the right line;
step 7, excavating sufficient soil below the transverse pipe curtain structure in the step 6 to provide a working surface, and constructing a second-layer top plate below the transverse pipe curtain structure;
and 8, constructing a beam plate and a station bedplate of the subway station at the negative two-layer, the negative three-layer and the negative four-layer by adopting a reverse construction method in sequence.
Furthermore, in the step 1, the tank wall reinforced mixing pile and the building isolation pile can be constructed synchronously.
Further, in step 2, the steel pipe column is arranged on the right side of the left side wall reinforced mixing pile of the station right line or on the left side of the right side wall reinforced mixing pile of the station left line.
Further, in step 2, the core of the steel pipe column is filled with micro-expansion concrete.
Further, in the step 3, a trenching excavation mode is adopted in the underground diaphragm wall construction process.
Further, in step 4, the ground traffic guidance and change adopts the traffic enclosure on the ground of the left line of the station, and the ground traffic of the right line is open; or traffic enclosure is carried out on the right line ground of the station, and the traffic of the left line ground is open.
Further, in the step 4, in the construction process of reinforcing the mixing pile on the left line or the right line of the station, when a building or a structure is arranged on the left side or the right side of the left line of the station, the construction of the building isolation pile is carried out on the left side or the right side of the left line of the station.
Further, in step 6, horizontal pipe curtain structure includes many steel pipe concretes and hasp, and the hasp is with many steel pipe concretes locking connection, and hasp hole department fills stagnant water material.
Further, in the step 6, in the jacking process of the transverse pipe curtain structure, a plurality of steel pipes penetrate through the underground continuous wall at the left-right line boundary of the station one by one, and are jacked and broken to the middle position of the wall body of the underground continuous wall at the left side of the left line or the right side of the right line; the multiple steel pipes are jacked one by one and are connected through the lock catches to form a transverse pipe curtain structure, sludge in the steel pipes is removed, and self-compacting compensation shrinkage concrete is filled in the steel pipes.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a pipe curtain cover excavation top-down construction method for subway station construction, which utilizes the supporting effect of a transverse pipe curtain structure to realize the bearing of the dead load of the soft soil body of a water-rich sand layer above the transverse pipe curtain structure and the live load of pedestrians in a travelling crane; because the horizontal pipe curtain structure of left side line or right side line and follow-up construction step of subway station are underground construction, need not to excavate the pipe curtain structure top soil body during the left side line or the right side line construction of subway station, realized effectively dodging the complicated underground pipeline in the soil body that coats, need not to enclose simultaneously and cover ground, consequently avoided excessively occupying the inconvenience that ground brought for pedestrian's traffic.
According to the invention, after the right line or the left line is covered and excavated by the cover and excavation top-down construction to carry one floor, the left line or the right line transverse pipe curtain structure is constructed at the preset position, so that reliable safety guarantee is provided for the left line or the right line cover and excavation top-down construction.
Drawings
FIG. 1 is a schematic structural diagram of step 1 in the construction method of the present invention;
FIG. 2 is a schematic structural diagram of step 2 in the construction method of the present invention;
FIG. 3 is a schematic structural diagram of step 3 in the construction method of the present invention;
FIG. 4 is a schematic structural diagram of step 4 in the construction method of the present invention;
FIG. 5 is a schematic structural diagram of step 5 in the construction method of the present invention;
FIG. 6 is a schematic structural diagram of step 6 in the construction method according to the present invention;
FIG. 7 is a schematic structural diagram of step 7 in the construction method according to the present invention;
FIG. 8 is a schematic structural view of step 8 of the construction method according to the present invention;
fig. 9 is a schematic view of a pipe curtain locking structure in the construction method of the present invention.
Wherein, 1 cell wall reinforcement stirring stake, 2 existing underground pipeline, 3 building isolation piles, 4 steel-pipe column, 5 pile foundations, 6 underground continuous wall, 7 burden one deck roof, 8 burden one deck bottom plates, 9 burden two-layer top longerons, 10 pipe curtain structure, 11 burden two-layer roof, 12 burden two-layer bottom plates, 13 burden three-layer bottom plates, 14 burden four-layer bottom plates, 15 burden three-layer top longerons, 16 burden four-layer top longerons, 17, burden four-layer end longerons, 18 steel pipe, 19, self-compaction compensation shrinkage concrete, 20 hasp structure, 21 apron, 22 station's platen.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention provides a pipe curtain cover excavation top-down construction method for subway station construction, which is characterized in that when an existing underground pipeline is positioned at a left line of a station or a right line of the station is constructed at first, a cover excavation mode is adopted to excavate the right line of the subway station, and after the right line of the subway station is covered and excavated to a preset position, a pipe curtain is jacked into the left line from the right line to form a shed cover structure; excavating soil below the left line shed cover structure to provide a working surface for constructing a left line top plate; and then, sequentially constructing each floor beam of the station by adopting a cover-excavation top-down construction method.
When the existing underground pipeline is located at the right line of the station or the left line of the station is constructed firstly, excavating the left line of the subway station in a cover-excavating mode, and jacking a pipe curtain from the left line to the right line to form a shed cover structure after the left line of the subway station is covered and excavated to a preset position; excavating soil below the right line shed cover structure to provide a working surface for constructing a right line top plate; and then, sequentially constructing each floor beam of the station by adopting a cover-excavation top-down construction method.
The method specifically comprises the following steps:
step 1, performing ground traffic enclosure on a right line or a left line of a subway station, and performing groove wall reinforced mixing pile construction on two sides of the right line or the left line of the subway station; constructing a building isolation pile 2 on the right side of the right line or the left side of the left line of the station; the tank wall reinforced mixing pile and the building isolation pile can be constructed synchronously;
step 2, constructing the steel pipe column and the pile foundation of the station; the steel pipe columns are arranged on the right side of the left side wall reinforced mixing pile of the station right line or the left side of the right side wall reinforced mixing pile of the station left line, and the bottom of each steel pipe column is provided with a pile foundation; filling micro-expansion concrete in the core of the steel pipe column;
step 3, carrying out underground continuous wall construction on the right line or the left line of the station, wherein the underground continuous wall construction is carried out in a trenching excavation mode; constructing a station right line or left line cover plate;
step 4, ground traffic guiding and changing, wherein traffic enclosure is carried out on the ground of the left line of the station and the ground traffic of the right line is opened in the ground traffic guiding and changing process, or traffic enclosure is carried out on the ground of the right line of the station and the ground traffic of the left line is opened; constructing a left line or a right line of the station by using the groove wall reinforced mixing pile and the underground continuous wall; when a building or a structure is arranged on the left side of the left line or the right side of the right line of the station, building isolation pile construction needs to be carried out on the left side of the left line or the right side of the right line of the station;
5, recovering ground traffic, and carrying out negative layer construction on the right line or the left line of the station by adopting a cover-excavation top-down method;
step 6, after the reverse construction of a layer carried on the right line or the left line of the station is finished, providing a working surface by the reverse construction, and carrying out jacking construction on the transverse pipe curtain structure on the left line or the right line of the station; the transverse pipe curtain structure comprises a plurality of steel pipe concretes and lock catches, the lock catches lock and connect the plurality of steel pipe concretes, and water stopping materials are filled in the holes of the lock catches;
step 7, excavating sufficient soil below the transverse pipe curtain structure in the step 6 to provide a working surface, and constructing a negative second-layer top plate below the transverse pipe curtain structure; in the jacking process of the transverse pipe curtain structure, a plurality of steel pipes penetrate through the underground continuous wall at the left-right line boundary of the station one by one, and are jacked and broken to the middle position of the underground continuous wall body on the left side of the left line or the right side of the right line; jacking a plurality of steel pipes one by one and connecting the steel pipes through a lock catch to form a transverse pipe curtain structure, removing sludge in the steel pipes, and filling self-compacting compensation shrinkage concrete into the transverse pipe curtain structure;
and 8, constructing a beam plate and a station bedplate of the subway station at the negative two-layer, the negative three-layer and the negative four-layer by adopting a reverse construction method in sequence.
The invention provides a pipe curtain cover excavation top-down construction method for subway station construction, which utilizes the supporting effect of a transverse pipe curtain structure to realize the bearing of the dead load of a soft soil body of a water-rich sand layer above the transverse pipe curtain structure and the live load of a pedestrian in a travelling crane, and can simultaneously realize the effective avoidance of complex underground pipelines in an overlying soil body, thereby avoiding the inconvenience brought to pedestrian traffic by excessively occupying the ground; according to the invention, after the right line or the left line is covered and excavated by the cover and excavation top-down construction to carry one floor, the left line or the right line transverse pipe curtain structure is constructed at the preset position, so that reliable safety guarantee is provided for the left line or the right line cover and excavation top-down construction.
Example 1
As shown in fig. 1 to 9, the embodiment provides a pipe curtain cover excavation top-down construction method for subway station construction, which specifically includes the following steps:
step 1, carrying out traffic enclosure on the ground of a right line of a subway station; avoiding the existing underground pipeline 2, performing the construction of the groove wall reinforced mixing pile 1 on two sides of the right line of the station, and performing the construction of the building isolation pile 3 on the right side of the right line of the station, wherein the building isolation pile 3 adopts a double-pipe rotary jet grouting pile;
step 2, constructing a steel pipe column 4 and a pile foundation 5 on the right side of the left groove wall reinforced mixing pile on the right line of the station, wherein the pile foundation 5 is arranged at the lower end of the steel pipe column 4, and the core of the steel pipe column 4 is filled with micro-expansion concrete;
step 3, constructing underground continuous walls 6 on two sides of the right line of the station, wherein the underground continuous walls 6 are constructed in a trenching excavation mode; then, constructing a station right line cover plate 21;
step 4, carrying out traffic enclosure on the ground of the left line of the station, and opening the traffic of the ground of the right line; then, performing construction of the groove wall reinforcing mixing piles 1 on two sides of the left line of the station, and when a building or a structure is arranged on the left side of the left line of the station, constructing building isolation piles 3 between the left side of the left line of the station and the building or the structure;
5, recovering ground traffic, and constructing a left layer of the right line of the station by adopting a cover-and-dig top-down method, specifically constructing a top plate 7 of the left layer of the right line, a bottom plate 8 of a left layer of the right line and a top longitudinal beam 9 of the left layer of the right line;
step 6, after the reverse construction of the negative layer on the right line is finished, providing a working surface by the reverse construction, and performing jacking construction on the transverse pipe curtain structure 10 on the left line of the station; the transverse pipe curtain structure 10 comprises a plurality of steel pipe concretes and lock catches 20, the lock catches 20 lock and connect the plurality of steel pipe concretes, and water stopping materials are filled in the holes of the lock catches 20; the steel pipe concrete comprises a steel pipe 18 and self-compacting compensation shrinkage concrete 19, and the self-compacting compensation shrinkage concrete 19 is filled in the steel pipe 18;
and 7: digging out sufficient soil below the transverse pipe curtain structure 10 to provide a working surface, and constructing a second-layer top plate 11 below the transverse pipe curtain structure;
and 8: the method comprises the following steps of sequentially constructing a negative second-layer bottom plate 12, a negative third-layer bottom plate 13, a negative fourth-layer bottom plate 14, a negative third-layer top longitudinal beam 15, a negative fourth-layer top longitudinal beam 16, a negative fourth-layer bottom longitudinal beam 17 and a platform plate 22 of the subway station according to a reverse construction method.
Example 2
The principle and concept of embodiment 2 are substantially the same as those of embodiment 1, except that when the existing underground utility 2 is located at the right line of the station or the left line of the station is constructed first, the construction direction is opposite to that of embodiment 1, and the construction procedure is similar to that of embodiment 1.
The above-mentioned preferred embodiments are merely illustrative of the embodiments of the present invention, and not restrictive, and various modifications and improvements to the technical solutions of the present invention may be made by those skilled in the art while keeping within the spirit of the present invention, and the scope of the present invention is defined by the claims.

Claims (9)

1. A pipe curtain cover excavation top-down construction method for subway station construction is characterized in that a cover excavation mode is adopted to carry out subway station right line or left line excavation; after the right line or the left line of the subway station is covered and excavated to a preset position, jacking a pipe curtain from the excavated line to the non-excavated line to form a shed cover structure; excavating soil below the shed cover structure to provide a working surface for a construction top plate; then, sequentially constructing each floor beam of the station by adopting a cover-excavation top-down construction method;
the method specifically comprises the following steps:
step 1, performing ground traffic enclosure on a right line or a left line of a subway station, and constructing groove wall reinforced mixing piles (1) on two sides of the right line or the left line of the subway station; constructing a building isolation pile (3) on the right side of the right line or the left side of the left line of the station;
step 2, constructing the steel pipe column (4) and the pile foundation (5) of the station;
step 3, constructing underground continuous walls (6) on the right side or the left side of the station; constructing a station right line or left line cover plate (21);
step 4, guiding and modifying ground traffic; constructing a left line or right line slot wall reinforcing mixing pile (1) and an underground continuous wall (6) of a station;
5, recovering ground traffic, and carrying out top-down construction of covering and digging on the right line or the left line of the station;
6, after the reverse construction of a layer is finished on the right line or the left line of the station, carrying out jacking construction on the transverse pipe curtain structure (10) on the left line or the right line;
step 7, digging out sufficient soil mass below the transverse pipe curtain structure (10) in the step 6 to provide a working surface, and constructing a second-layer top plate (11) below the transverse pipe curtain structure (10);
and 8, constructing a beam plate and a station bedplate of the subway station at the negative two-layer, the negative three-layer and the negative four-layer by adopting a reverse construction method in sequence.
2. The pipe curtain cover excavation top-down construction method for subway station construction as claimed in claim 1, wherein in step 1, the trench wall reinforced mixing pile (1) and the building isolation pile (2) can be constructed synchronously.
3. The pipe curtain cover excavation top-down construction method for subway station construction as claimed in claim 1, wherein in step 2, the steel pipe column (4) is set on the right side of the left side wall reinforced mixing pile (1) of the right side of the station or on the left side of the right side wall reinforced mixing pile (1) of the left side of the station.
4. The pipe curtain cover excavation top-down construction method for subway station construction as claimed in claim 1, wherein in step 2, the core of the steel pipe column (4) is filled with micro-expansion concrete.
5. The pipe curtain cover excavation top-down construction method for subway station construction as claimed in claim 1, wherein in step 3, the underground diaphragm wall (6) construction process adopts a trenching excavation method.
6. The pipe curtain cover excavation top-down construction method for subway station construction as claimed in claim 1, wherein in step 4, the ground traffic guidance and modification is performed by performing traffic enclosure on the ground of the left line of the station, and the ground traffic of the right line is open; or traffic enclosure is carried out on the right line ground of the station, and the traffic of the left line ground is open.
7. The pipe curtain cover excavation top-down construction method for subway station construction as claimed in claim 1, wherein in step 4, in the construction process of reinforcing mixing pile (1) on the left line or right line wall of the station, when a building or a structure is provided on the left side or right side of the left line of the station, the building isolation pile (2) is constructed on the left side or right side of the left line of the station.
8. The pipe curtain cover excavation top-down construction method for subway station construction as claimed in claim 1, wherein in step 6, the transverse pipe curtain structure (10) comprises a plurality of steel pipe concretes and lock catches, the lock catches lock and connect the plurality of steel pipe concretes, and water stopping materials are filled in the holes of the lock catches.
9. The pipe curtain cover excavation top-down construction method for subway station construction according to claim 8, characterized in that in step 6, in the jacking process of the transverse pipe curtain structure (10), a plurality of steel pipes penetrate through the underground continuous wall (6) at the left and right line boundaries of the station one by one, and are jacked and broken to the middle position of the underground continuous wall body (6) at the left side of the left line or the right side of the right line; the multiple steel pipes are jacked one by one and are connected through the lock catches to form a transverse pipe curtain structure, sludge in the steel pipes is removed, and self-compacting compensation shrinkage concrete is filled in the steel pipes.
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CN114183150A (en) * 2022-02-15 2022-03-15 中铁隧道局集团路桥工程有限公司 Construction method for underground excavation station of ultra-shallow buried canopy

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