CN110670578A - Permanent-temporary integrated enclosure structure for subway station and construction method - Google Patents

Abstract

The invention discloses a subway station permanent-temporary integrated enclosure structure and a construction method thereof, wherein the structure comprises an underground continuous wall, wherein the underground continuous wall is constructed after the construction of a TBM grouting area is finished and is also used as a permanent side wall of the structure; one side or two sides of the wall body of the underground continuous wall are reserved with screw-thread steel joints which are used for being fixedly connected with screw-thread steel when a bottom plate of a hall of a subway station is constructed; the wall body of the underground continuous wall connected with the subway station channel bottom plate is built by the crushable plates, and the vacant sites after the crushable plates are removed are filled with reinforced concrete. The invention greatly saves the construction cost brought by the prior dismantling of the diaphragm wall, reduces the working procedures, improves the construction efficiency, saves the construction period, reduces the construction waste and has little influence on the surrounding environment.

Description

Permanent-temporary integrated enclosure structure for subway station and construction method

Technical Field

The invention relates to the technical field of underground engineering and underground pipe gallery construction, in particular to a permanent-faced integrated enclosure structure of a subway station and a construction method.

Background

In the process of excavating and building a support at a station, a fertilizer groove is generally excavated in order to provide a construction working surface. The construction of the fertilizer tank needs to excavate a large amount of earthwork, and backfill is needed after the construction is completed. With the increasing cost of earth, saving earth excavation and backfill has become a concern for builders and designers. In addition, in the implementation of a plurality of projects, the situation that the backfilling of the fertilizer grooves is not solid is caused, so that the subsequent foundation sinks and deforms, quality problems are caused, and adverse effects are caused.

One important aspect of excavation of a foundation pit is to protect the safe use of surrounding structures. The foundation pit supporting type is various, and cement soil walls, soil nailing walls, anchor rods, row piles, underground continuous walls and the like are common. The cement-soil wall is the main form of a gravity type supporting structure and mainly comprises a cement-soil mixing pile and a high-pressure injection grouting method. The soil nailing wall technology is characterized in that soil nails with certain lengths and densely distributed are placed in soil bodies on the side wall of a foundation pit, the soil nails are tightly combined with surrounding soil bodies to work together to form a composite soil body, the overall rigidity of the soil body is improved, the defect of the strength of the soil body is overcome, and the overall stability of the foundation pit side slope is obviously improved. The anchor bolt support is a relatively new deep foundation pit support technology, and is a deep foundation pit combined support structure combining a soil retaining structure and an external pulling system. The anchor rod is a tension member, one end of which is connected with an engineering structure or a retaining pile wall, the other end of which is anchored in the soil layer or rock stratum of the foundation so as to bear the uplifting force, the drawing force, the tilting force or the soil pressure of the retaining wall of the structure, the anchor rod utilizes the anchoring force of the stratum to maintain the stability of the structure, and the anchor rod mainly comprises an anchor head, an anchor pull rod and an anchoring body 3. The row pile wall support system is a waterproof retaining system consisting of a surrounding wall consisting of pile row type surrounding walls or underground continuous walls, a support system and an impermeable structure. Underground diaphragm walls were first in 1950 in italy and are used as diaphragm walls for dams or reservoirs. In 1958, the row pile type underground continuous wall is adopted as a dam impervious wall in China. In recent decades, the underground diaphragm wall technology in China has gained great success in engineering practice and theoretical research. The underground continuous wall is constructed section by using special trenching equipment on the ground under the condition of slurry wall protection, excavating deep grooves in sections, hoisting reinforcement cages into the grooves, and pouring concrete under the cement paste by using a conduit method to form a section of wall section underground, thereby forming a continuous reinforced concrete wall body. As a foundation pit supporting structure, the composite material has the functions of retaining soil or intercepting water and preventing seepage in foundation pit engineering.

The underground continuous wall has high rigidity and is the strongest support type in the support structure. Demolish underground continuous wall after the construction is accomplished, increased the process, reduced the efficiency of construction, can cause the influence to the surrounding environment simultaneously.

Disclosure of Invention

Aiming at the problems, the invention aims to provide a subway station permanent-faced integrated enclosure structure and a construction method, which can ensure various requirements of a station structure, do not need to dismantle underground continuous walls, simplify the working procedures and improve the construction efficiency. The technical scheme is as follows:

a permanent-faced integrated enclosure structure of a subway station comprises an underground continuous wall, wherein the underground continuous wall starts to be constructed after the construction of a TBM grouting area is finished and is also used as a permanent side wall of the structure; one side or two sides of the wall body of the underground continuous wall are reserved with screw-thread steel joints which are used for being fixedly connected with screw-thread steel when a bottom plate of a hall of a subway station is constructed; the wall body of the underground continuous wall connected with the subway station channel bottom plate is built by the crushable plates, and the vacant sites after the crushable plates are removed are filled with reinforced concrete.

Furthermore, reinforced concrete support columns for supporting the subway station passage floor are built on the outer sides of the underground continuous walls.

Furthermore, the upper end face of the smashing plate is flush with the upper surface of the subway station channel bottom plate, and the lower end face of the smashing plate is flush with the upper end face of the reinforced concrete support column.

Furthermore, the threaded steel joint is an internally threaded steel pipe.

A construction method of a permanent-faced integrated enclosure structure of a subway station comprises the following steps:

step 1: after the construction of a section of TBM grouting area is completed, constructing an underground continuous wall serving as a permanent side wall of a subway station structure, and constructing a wall body connecting the underground continuous wall and a subway station channel by using a breakable plate;

step 2: reserving a deformed steel bar joint at one side or two sides of the underground continuous wall steel cage for fixedly connecting with deformed steel bars during construction of a hall floor of a subway station;

and step 3: building reinforced concrete support columns outside the underground continuous wall, wherein the reinforced concrete support columns are used for supporting a subway station channel bottom plate;

and 4, step 4: and removing the knock-down plate, and filling the vacant positions with reinforced concrete when the subway station channel bottom plate is poured.

The invention has the beneficial effects that: the invention greatly saves the construction cost brought by the prior dismantling of the diaphragm wall, reduces the working procedures, improves the construction efficiency, saves the construction period, reduces the construction waste and has little influence on the surrounding environment.

Drawings

FIG. 1 is a schematic plan view of one embodiment of the present invention.

Fig. 2 is a schematic view of a diaphragm wall joint according to the present invention.

Fig. 3 is a partial sectional view of a-a in fig. 2 illustrating the underground diaphragm wall joint according to the present invention.

In the figure: the method comprises the following steps of 1-ground, 2-a knock-down plate, 3-an underground diaphragm wall, 4-a TBM grouting area and 5-a preset tunnel position.

Detailed Description

The invention is described in further detail below with reference to the figures and specific embodiments. The integration in the permanent adjacent integrated enclosure structure of the subway station refers to that the permanent side wall of the structure is made of an underground continuous wall. The enclosure structure refers to an underground continuous wall and the like.

The underground continuous wall starts to be constructed after the construction of a TBM (Tunnel Boring Machine) grouting area is completed; as shown in fig. 1, the underground continuous wall is built by using a crushable plate at a part of the underground continuous wall near a side wall of the subway station passage. The upper end face of the smashing plate is flush with the upper end face of the subway station channel bottom plate, and the lower end face of the smashing plate is superposed with the upper end face of the reinforced concrete support column. The board 2 that can smash is in the diaphragm wall 3 construction process, installs in the assigned position according to the design requirement, demolishs it when constructing the subway station passageway floor in the follow-up construction.

According to design requirements, reserving threaded steel joints of bottom plates of all halls of the subway station on one side or two sides of a wall body of the underground continuous wall; and when the subway station hall bottom plate is constructed, the deformed steel bars are connected with the joints reserved on one side or two sides of the underground continuous wall. As shown in fig. 2, the underground diaphragm wall joint according to the present embodiment is composed of internally threaded steel pipes for connecting the screw-threaded steel pipes used for the floor of each hall. The internal thread structure of the underground diaphragm wall joint is shown in figure 3.

And the reinforced concrete support columns are built outside the underground continuous wall and are used for supporting the subway station channel bottom plate. And the position of the knock-down plate, which is left after disassembly, is filled with reinforced concrete when the subway station channel bottom plate is poured.

The subway station permanent-temporary integrated enclosure structure design and construction method comprises the following steps:

after the construction of a certain TBM grouting area is completed, starting the construction of the underground continuous wall of the permanent side wall of the subway station structure: reserving a threaded steel joint of each hall bottom plate on one side or two sides of the underground continuous wall steel cage according to design requirements; and when the subway station hall bottom plate is constructed, the deformed steel bars are connected with the joints reserved on one side or two sides of the underground continuous wall.

And building the underground continuous wall at a part of the position close to one side wall of the subway station passage by using a crushable plate. The upper end face of the smashing plate is flush with the upper end face of the subway station channel bottom plate, and the lower end face of the smashing plate is superposed with the upper end face of the reinforced concrete support column.

And building reinforced concrete support columns outside the underground continuous walls for supporting the subway station channel bottom plate.

And disassembling the knock-down plate, and filling the vacant position with reinforced concrete when pouring the subway station channel bottom plate.

Claims (5)

1. A permanent-faced integrated enclosure structure of a subway station is characterized by comprising an underground continuous wall (3), wherein the underground continuous wall starts to be constructed after the construction of a TBM grouting area (4) is finished and is also used as a permanent side wall of the structure; one side or two sides of the wall body of the underground continuous wall (3) are reserved with screw-thread steel joints which are used for being fixedly connected with screw-thread steel during construction of a hall floor of a subway station; the wall body of the underground continuous wall (3) connected with the subway station channel bottom plate is built by the knock-down plate (2), and the vacant space after the knock-down plate (2) is disassembled is filled by reinforced concrete.

2. The permanent integrated enclosure structure of the subway station as claimed in claim 1, wherein reinforced concrete support columns for supporting the floor of the subway station passage are constructed on the outer side of said underground continuous wall (3).

3. The subway station permanent facing integrated enclosure structure as claimed in claim 2, wherein the upper end face of the crushable plate is flush with the upper surface of the subway station passage bottom plate, and the lower end face is flush with the upper end face of the reinforced concrete support column.

4. The subway station permanent facing integrated enclosure structure as claimed in claim 1, wherein said screw steel joint is an internally threaded steel pipe.

5. A construction method of the permanent facing integrated envelope structure of the subway station as claimed in claim 1, comprising the steps of:

step 1: after the construction of a section of TBM grouting area is completed, constructing an underground continuous wall serving as a permanent side wall of a subway station structure, and constructing a wall body connecting the underground continuous wall and a subway station channel by using a breakable plate;

step 2: reserving a deformed steel bar joint at one side or two sides of the underground continuous wall steel cage for fixedly connecting with deformed steel bars during construction of a hall floor of a subway station;

and step 3: building reinforced concrete support columns outside the underground continuous wall, wherein the reinforced concrete support columns are used for supporting a subway station channel bottom plate;

and 4, step 4: and removing the knock-down plate, and filling the vacant positions with reinforced concrete when the subway station channel bottom plate is poured.

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