阅读说明：本技术 一种轨道交通既有车站续接车站的施工方法 (Construction method for continuous station connection of existing station of rail transit ) 是由 李虎 黄振科 周兵 孙国凯 董俊 李坤 张凯 王华兵 倪振杰 宋继来 于 2021-09-18 设计创作，主要内容包括：本发明涉及一种轨道交通既有车站续接车站的施工方法,包括以下步骤：在既有车站一侧施工续接车站围护结构,续接车站围护结构与既有车站围护结构之间形成接口区域；对接口区域进行注浆加固；在续接车站范围内进行基坑施工,基坑施工完成后,对续接车站的主体结构进行施工；对接口区域土体进行开挖,凿除接口区域一侧的既有车站围护结构、侧墙和接口区域另一侧的续接车站围护结构,将既有车站和续接车站连通,并施工用于连接续接车站主体结构和既有车站主体结构的连接结构,本发明的方法保证了既有车站的运营安全。(The invention relates to a construction method for a continuous station of an existing station of rail transit, which comprises the following steps: constructing a continuous station enclosure structure on one side of the existing station, and forming an interface area between the continuous station enclosure structure and the existing station enclosure structure; grouting and reinforcing the interface area; carrying out foundation pit construction in the range of the splicing station, and after the foundation pit construction is finished, constructing a main body structure of the splicing station; excavating the soil body of the interface area, chiseling the existing station enclosure structure and the side wall on one side of the interface area and the continuous station enclosure structure on the other side of the interface area, communicating the existing station with the continuous station, and constructing a connecting structure for connecting the main structure of the continuous station with the main structure of the existing station.)

1. A construction method for a continuous station of an existing station of a rail transit is characterized by comprising the following steps:

constructing a continuous station enclosure structure on one side of the existing station, and forming an interface area between the continuous station enclosure structure and the existing station enclosure structure;

grouting and reinforcing the interface area;

carrying out foundation pit construction in the range of the splicing station, and after the foundation pit construction is finished, constructing a main body structure of the splicing station;

excavating the soil body of the interface area, chiseling the existing station enclosure structure and the side wall on one side of the interface area and the continuous station enclosure structure on the other side of the interface area, communicating the existing station with the continuous station, and connecting the main structure of the existing station with the main structure of the continuous station by using the construction connecting structure.

2. The construction method of a station of an existing station of a rail transit according to claim 1, wherein the excavation of the interface area adopts a layered excavation, the enclosure structures of the station of the existing station and the enclosure structures and the side walls of the existing station at two sides of the interface area are synchronously chiseled off while the excavation is performed, after the excavation and chiseling of each layer are completed, the support plate changing belt is constructed between the main structure parts corresponding to the existing station and the station of the existing station, and then the connecting structure is constructed.

3. The method as claimed in claim 2, wherein when the same layer of the interface area is excavated, soil bodies are excavated from one end of the excavated portion along the direction of the next station by a first set distance, after a second set distance, the excavation of the soil bodies is continued along the direction of the next station by the first set distance, the excavation is continued until the construction reaches the other end of the excavated portion, and then the remaining soil bodies are excavated.

4. The construction method of the continuous station of the existing station of the rail transit as claimed in claim 1, wherein the enclosure of the continuous station adopts a diaphragm wall, and wall seam water stop is applied at the wall width seam of the diaphragm wall.

5. The construction method of the continuous station of the existing station of the rail transit as claimed in claim 1, wherein the part of the envelope of the continuous station, which is parallel to the side wall of the continuous station, extends to the position of the envelope of the existing station, and a water stop pile is applied to the position of the joint with the envelope of the existing station.

6. The construction method of a station where an existing station of a rail transit continues to be connected as claimed in claim 1, wherein the joint area is reinforced by grouting using a micro-orbiting MJS construction method.

7. The method as claimed in claim 1, wherein before the excavation of the foundation pit, grouting is performed at a set distance below the bottom surface of the foundation pit of the continuous station to form a foundation pit bottom seal.

8. The construction method of the station of the existing station of the rail transit as claimed in claim 1, wherein before the excavation of the foundation pit, a precipitation well is constructed in the range of the foundation pit of the station for precipitation.

9. The construction method of a splicing station of an existing station of rail transit as claimed in claim 1, wherein after the construction of the bottom plate of the main structure of the splicing station is completed, a waterproof curtain is constructed within a set range under the existing station by means of horizontal grouting or horizontal freezing, and the end of the waterproof curtain close to the splicing station extends to the interface area.

10. The method as claimed in claim 1, wherein a support member is synchronously installed at a corner of the foundation pit during excavation of the foundation pit, and the support member is fixed to a surrounding structure of the continuous station for resisting pressure of soil on the surrounding structure.

Technical Field

The invention relates to the technical field of rail transit, in particular to a construction method for a continuous station of an existing station of the rail transit.

Background

The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.

With the increase of subway lines, the construction of subsequent transfer stations of the existing operation lines is more and more. On the basis of ensuring the safety of the existing operation line, the excavation of a subsequent underground station foundation pit and the continuous connection design of a main structure transfer node become more and more important, when the existing continuous connection station is constructed, the excavation of the foundation pit utilizes the side wall and the enclosure structure of the existing operation line as a lateral stress system of the foundation pit when the continuous connection station is constructed, and the inventor finds that when the construction method is used for constructing the continuous connection station, the disturbance on the soil body of the existing operation line is large, and the excavation and precipitation of the continuous connection station foundation pit have large influence on the existing subway facility, so that certain operation risk is caused.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a construction method for a continuous station of the existing station of the rail transit, and reduces the operation risk of the construction of the continuous station to the existing station.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a construction method for a continuous station of an existing station of rail transit, which comprises the following steps:

constructing a continuous station enclosure structure on one side of the existing station, and forming an interface area between the continuous station enclosure structure and the existing station enclosure structure;

grouting and reinforcing the interface area;

carrying out foundation pit construction in the range of the splicing station, and after the foundation pit construction is finished, constructing a main body structure of the splicing station;

excavating the soil body of the interface area, chiseling the existing station enclosure structure and the side wall on one side of the interface area and the continuous station enclosure structure on the other side of the interface area, communicating the existing station with the continuous station, and connecting the main structure of the existing station with the main structure of the continuous station by using the construction connecting structure.

Optionally, the excavation of the interface area is layered excavation, the enclosing structures of the splicing stations on two sides of the interface area, the enclosing structures and the side walls of the existing stations are synchronously chiseled off while the excavation is performed, after the excavation and chiseling of each layer are completed, a supporting plate changing belt is constructed between the existing stations and the main structure parts corresponding to the splicing stations, and then a connecting structure is constructed.

Optionally, when the same layer of the interface area is excavated, soil bodies with a first set distance are transversely excavated from one end of the excavation portion along the splicing station, after a second set distance is separated, soil bodies with the first set distance are continuously excavated along the splicing station, the excavation is sequentially carried out until the excavation portion reaches the other end of the excavation portion, and then the remaining soil bodies are excavated.

Optionally, the enclosure structure of the continuous station adopts a diaphragm wall, and wall seam water stop is performed at the wall width seam of the diaphragm wall.

Optionally, the part of the continuous station enclosure structure parallel to the continuous station side wall extends to the position of the enclosure structure of the existing station, and a water stop pile is constructed at the position of a joint of the existing station enclosure structure and the continuous station enclosure structure.

Optionally, grouting reinforcement is performed on the interface area by adopting a micro-orbiting MJS construction method.

Optionally, before the foundation pit is excavated, grouting is performed at a set distance below the bottom surface of the foundation pit of the splicing station to form a foundation pit bottom seal.

Optionally, before the foundation pit is excavated, a precipitation well is constructed in the range of the station foundation pit and is connected to perform precipitation construction.

Optionally, after the bottom plate of the main structure of the splicing station is constructed, a waterproof curtain is constructed in a set range below the existing station in a horizontal grouting or horizontal freezing mode, and the end, close to the splicing station, of the waterproof curtain extends to the interface area.

Optionally, when the foundation pit is excavated, a support member is synchronously arranged at the corner position of the foundation pit, and the support member is fixed with the enclosure structure of the continuous station and used for resisting pressure of a soil body on the enclosure structure.

The invention has the beneficial effects that:

1. according to the construction method, the interface area is formed between the enclosure structure of the continuous station and the enclosure structure of the existing station, and grouting reinforcement is performed on the interface area, so that the enclosure structure of the existing station is not required to be used as the enclosure structure for construction of the continuous station when construction steps such as excavation of a foundation pit, precipitation of the foundation pit, construction of a main structure of the continuous station and the like are performed, disturbance of soil on the existing station is reduced, influence on facilities of the existing station is reduced, and operation risk of the existing station is reduced.

2. According to the construction method, the reinforced soil body in the interface area is subjected to a layered excavation method, a connecting structure is synchronously constructed, the enclosing structures and the side walls of the existing station and the splicing station are chiseled off, the soil body with a first set distance is excavated transversely from one end of the excavation part along the splicing station on the same layer during layered excavation, the soil body with the first set distance transversely along the splicing station is continuously excavated after the second set distance is separated, the excavation is circulated until the soil body is constructed to the other end of the excavation part, and then the remaining soil body is excavated.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

FIG. 1 is a plan view of a construction method according to embodiment 1 of the present invention;

FIG. 2 is a sectional view of the construction method according to embodiment 1 of the present invention;

FIG. 3 is an enlarged plan view of an interface region in accordance with embodiment 1 of the present invention;

FIG. 4 is an enlarged view of the point A in FIG. 2 according to embodiment 1 of the present invention;

FIG. 5 is an enlarged view of the embodiment 1 of the present invention at B in FIG. 2;

the system comprises a 100-splicing station foundation pit range, 101-a first ground connecting wall, 102-a second ground connecting wall, 103-wall seam water stop, 104-a dewatering well, 105-a first support, 106-an Nth support, 107-a splicing station bottom plate, 108-a splicing station middle plate, 109-a splicing station top plate, 110-a splicing station main body side wall, 111-a foundation pit back cover, 112-an operation line of the splicing station, 200-an interface area, 201-a water stop pile, 202-a reinforcement body, 203-a support changing plate strip, 204-an interface area side wall, 205-an interface area top plate, 206-an interface area middle plate, 207-an interface area bottom plate, 300-a transfer area, 301-an operation line of an existing station, 302-an existing station enclosure structure, 303-an existing station side wall, 304-an existing station top plate, 305-an existing station middle plate, 306-an existing station curtain bottom plate, 307-a water stop curtain.

Detailed Description

Example 1

The embodiment provides a construction method for a station of a track traffic existing station, wherein an operation line 301 of the existing station is perpendicular to an operation line 112 of the station, the existing station is provided with an interface used for being connected with the station, the interface is plugged by a temporary plugging wall, a transfer area 300 is arranged in the existing station corresponding to the interface, and the construction of the station comprises the following steps:

step 1: and constructing an enclosure structure of the continuous station.

Step 1.1, constructing an enclosure structure of the splicing station on one side of an interface part, used for being connected with the splicing station, of the existing station, wherein the enclosure structure of the splicing station is used for supporting a foundation pit constructed by the splicing station, and the enclosure structure can adopt fender piles or a ground connecting wall as a lateral stress member and a vertical waterproof curtain of the foundation pit of the splicing station.

In this embodiment, the enclosure structure is a diaphragm wall, the construction method of the diaphragm wall is the construction method of the existing diaphragm wall, and the specific steps are not described in detail herein.

The foundation pit of the continuous station is a rectangular foundation pit, and the length direction of the foundation pit is the line operation direction of the continuous station, so that the underground diaphragm wall is provided with four sides which are respectively used for enclosing four side walls of the foundation pit.

The underground diaphragm wall close to the enclosure structure of the existing operation station and parallel to the existing operation station along the direction of the operation line has a set distance with the enclosure structure of the existing operation station, so that an interface area 200 is formed between the enclosure structure of the continuous operation station and the enclosure structure of the existing operation station. The size of the interface region can be set according to actual requirements.

In this embodiment, the underground diaphragm wall parallel to the existing station enclosure interface is a small-width groove section underground diaphragm wall, the small-width groove section underground diaphragm wall means that the single-width length is 3 m to 4 m, the underground diaphragm wall perpendicular to the existing station enclosure structure is a conventional-width groove section underground diaphragm wall, and the conventional-width groove section underground diaphragm wall means that the single-width length is 5.5 m to 6.5 m, preferably 6 m.

Step 1.2, in order to enhance the water stopping effect of the diaphragm wall, wall seam water stopping 103 is applied to the wall width joint of the diaphragm wall, and the construction method adopts the existing wall seam water stopping construction method.

And 1.3, in order to ensure the effectiveness of sealing water of the foundation pit of the splicing station, grouting at a set distance below the bottom surface of the foundation pit to form a foundation pit back cover 111. The range of the foundation pit back cover covers the range of the whole foundation pit.

And 1.4, constructing a precipitation well 104 in the range of the foundation pit 100 of the continuous station, and performing precipitation construction.

Step 1.5: the two long underground diaphragm walls perpendicular to the existing operation station enclosure structure extend to the position of the existing operation station enclosure structure, and the water stop piles are constructed at the joint of the two long underground diaphragm walls and the existing operation station enclosure structure. It can be understood that other construction methods can be selected according to actual needs to construct the water stop pile.

Step 2: and grouting and reinforcing the interface area.

In this embodiment, cement slurry is used for grouting reinforcement, cement slurry is injected into the soil body of the interface region by using a micro-disturbance MJS method, and the soil body of the interface region is reinforced to form a reinforced body 202.

And step 3: and (5) constructing a splicing station.

Step 3.1, excavating the foundation pit within the range of the splicing station, excavating while constructing supports at the corner positions of the foundation pit by adopting a mode of supporting along with excavation, constructing a plurality of supports from top to bottom, wherein the topmost support is a first support 105, then sequentially downwards supporting a second support and a third support till an Nth support 106, and two ends of each support are connected with adjacent diaphragm walls for bearing the pressure of a soil body on the diaphragm walls.

Step 3.2 after the foundation pit is excavated to the set depth, the excavation of the foundation pit is completed, and then the main structure of the continuous station is constructed by the following specific steps:

after the foundation ditch excavation to the settlement degree of depth, the continuous station major structure's of construction bottom plate 107, the one end that the bottom plate is close to existing station is equipped with anti bracket structure 208, and bottom plate and anti bracket structure all adopt reinforced concrete structure, and integral type casting moulding waits to the bottom plate and meets the designing requirement with anti bracket structural strength after, sets for the horizontal range in construction water-stop curtain 307 in existing station bottom plate below, the water-stop curtain is close to the tip that continuous station extends to the interface region, and this embodiment adopts the frozen mode of level or horizontal slip casting to construct the water-stop curtain, and is preferred, adopts the mode of horizontal slip casting to carry out the slip casting in the horizontal range of settlement below existing station bottom plate, forms the water-stop curtain.

After the waterproof curtain construction is completed, a middle plate 108, a top plate 109 and a side wall 110 of a splicing station of the splicing station are constructed in sequence, the middle plate, the top plate and the side wall are all of reinforced concrete structures, the construction method of the existing subway station is adopted, and the method comprises the steps of erecting a reinforcement cage, pouring concrete and the like.

Because the construction of the subsequent station adopts the independent diaphragm wall as a stress structure system and grouting reinforcement is carried out in the interface area, the disturbance of the subsequent station construction to the soil body of the existing station is reduced, and the operation risk of the existing station is reduced.

And 4, step 4: and after the construction of the splicing station is finished, the splicing station is communicated with the existing station.

The specific construction method comprises the following steps:

and excavating the reinforcement bodies 202 in the butt joint area layer by layer from top to bottom, excavating soil bodies at a first set distance transversely along the continuous joint station from one end of the excavating part during each layer of excavation, continuously excavating the soil bodies at the first set distance transversely along the continuous joint station after a second set distance is separated, circularly excavating until the soil bodies are constructed to the other end of the excavating part, and then excavating the rest soil bodies.

Specifically, for the excavated soil body of the same layer, the excavated soil body is divided into a plurality of areas along the transverse direction of the continuous station and numbered, firstly, the soil body of the area with odd number or even number is excavated from one end of the excavated soil body to the other end, and after the soil body of the rest area is excavated to the other end of the excavated soil body.

When the excavation is carried out, the enclosing structures and the side walls on the two sides of the interface area are chiseled out synchronously, specifically, the underground continuous wall of the continuous station on one side of the interface area needing chiseling out is close to the underground continuous wall 101 of the existing station and is parallel to the existing station, and the enclosing structures 302 and the temporary blocking walls of the existing station on the other side of the interface area needing chiseling out are required to enable the existing station and the continuous station to be communicated with each other.

After the excavation, the ceiling 205 of the interface area is constructed, and the existing station ceiling 304 and the next station ceiling 109 are connected by the ceiling of the interface area.

After the reinforcement body excavates and sets for the distance to first floor medium plate below, trade a plurality of fagging areas 203 of trading of being under existing station and the first floor medium plate of splicing the station, trade the lateral separation setting of fagging area along splicing the station for a plurality of.

After the construction of the support plate replacement belt is completed, a reinforcement cage and a formwork of the middle plate in the interface area are built, then concrete pouring is carried out on the middle plate in the interface area, the middle plate in the first layer in the interface area is poured out, the middle plates in the first layer in the existing station and the station which is connected continuously are connected, and the support plate replacement belt is buried in the middle plate in the first layer in the interface area. The connection between the existing station midplane 305 and the next station midplane 108 is achieved.

And after the reinforcing body is excavated to a set distance below the second-layer middle plate, constructing the second-layer middle plate and the corresponding support plate replacement belt in the interface area by adopting the same method.

And after the excavation of the reinforcing body and the chiseling of the underground continuous wall, the building envelope and the temporary blocking wall on two sides of the interface area are finished, constructing a bottom plate of the interface area, wherein the bottom plate of the interface area is connected with the bottom plates of the existing station and the continuous station.

And then, casting construction is carried out on the side wall 204 of the interface area, so that the side wall of the interface area connects the existing station side wall 303 with the continuous station side wall 110.

The top plate, the middle plate, the bottom plate and the side walls in the interface area jointly form a connecting structure for connecting the existing station main body structure and the continuous station main body structure.

After the construction of the bottom plate in the interface area is completed, the construction of the continuous station is completed, and the communication between the continuous station and the existing station is realized. Because the reinforced soil body of the interface area adopts a layered excavation method, the connecting structure is synchronously constructed, the enclosing structures and the side walls of the existing station and the continuous station are chiseled, and the construction of the support plate changing belt is combined, the bias pressure stress of the existing station is reduced, and the operation risk of the existing station is reduced.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.