阅读说明：本技术 一种拱形地铁车站拓建接驳结构及施工方法 (Arch subway station building connection structure and construction method ) 是由 雷升祥 黄欣 冀国栋 赵静波 张京京 陈一夫 岳长城 陈霞飞 彭澍 高飞鹏 丁正 于 2021-06-01 设计创作，主要内容包括：本发明公开了一种拱形地铁车站拓建接驳结构,包括既有地铁车站、新建换乘通道、既有顶拱边梁、既有地铁车站侧墙,换乘通道初支、换乘通道顶板、换乘通道底板、加强柱和加强环梁。新建换乘通道的底部与既有地铁车站侧墙相接驳,接驳处设有两个接驳点一；新建换乘通道的顶部与既有顶拱边梁相接驳,接驳处设有两个接驳点二；两个接驳点一与两个接驳点二之间设有两个并列的加强柱,两个接驳点一与两个接驳点二以及两个加强柱之间为闭合环框结构。闭合环框结构能够有效地减小地下工程新旧结构连通接驳施工风险,可推广应用于地下工程拓建施工中；施工工艺相对简单,施工周期较短,节省了现场大量的人力以及时间的支出耗费。(The invention discloses an arch subway station building and connecting structure which comprises an existing subway station, a newly-built transfer passage, an existing arch top edge beam, existing subway station side walls, a transfer passage primary support, a transfer passage top plate, a transfer passage bottom plate, a reinforcing column and a reinforcing ring beam. The bottom of the newly-built transfer passage is connected with the side wall of the existing subway station, and two first connecting points are arranged at the connecting position; the top of the newly-built transfer passage is connected with the existing arch edge beam, and two connection points II are arranged at the connection position; two parallel reinforcing columns are arranged between the first two connection points and the second two connection points, and a closed ring frame structure is arranged between the first two connection points, the second two connection points and the two reinforcing columns. The closed ring frame structure can effectively reduce the construction risk of communicating and plugging new and old structures of the underground engineering, and can be popularized and applied to underground engineering construction; the construction process is relatively simple, the construction period is short, and a large amount of labor and time expenditure on site are saved.)

1. An arch-shaped subway station extension connection structure is characterized in that an existing subway station is an existing PBA (Poly Butylene Acrylonitrile butadiene styrene) station, an existing top arch edge beam is a top arch structure of the existing subway station, and a side wall of the existing subway station is a lower structure of the existing subway station; the method is characterized in that: the bottom of the newly-built transfer passage is connected with the side wall of the existing subway station, and two first connecting points are arranged at the connecting position; the top of the newly-built transfer passage is connected with the existing arch edge beam, and two connection points II are arranged at the connection position;

two parallel reinforcing columns are arranged between the first two connection points and the second two connection points, the first connection point is of a reinforcing column and embedded steel bar connecting structure of an existing arch edge beam, the second connection point is of a reinforcing column and embedded steel bar connecting structure of an existing station side wall, and a closed ring frame structure is arranged between the first two connection points, the second two connection points and the two reinforcing columns.

2. The arched subway station building connection structure as claimed in claim 1, wherein: the bottom and the top of the new transfer channel are provided with a transfer channel primary support, the transfer channel primary support at the bottom is provided with a transfer channel bottom plate, and the transfer channel primary support at the top is provided with a transfer channel top plate.

3. The arched subway station building connection structure as claimed in claim 1, wherein: and the reinforcing columns at the first connection point and the second connection point are fixedly connected with the existing arch edge beam and the existing lower side wall of the station through embedded bars.

4. The arched subway station building connection structure as claimed in claim 1, wherein: the newly-built transfer passage is of a single-span vault vertical wall section structure.

5. A construction method using the arched subway station connection structure as claimed in any one of claims 1 to 4, characterized in that: determining the position of a connection hole at the connection part of the new and old structures according to a design drawing, and constructing reinforcing columns on two sides of the connection hole; the reinforcing column is fixedly connected with the existing arch edge beam and the existing lower side wall of the station through embedded bars to form a closed ring frame structure.

6. Construction method according to claim 5, characterized in that: the method also includes the steps of:

s1, excavating a newly-built transfer channel by adopting a subsurface excavation CRD method, and constructing a primary support of the transfer channel to the outer side of the side wall of the existing subway station;

s2, removing temporary middle partition walls of the newly-built transfer channel in sections, constructing a waterproof layer of the newly-built transfer channel, and reserving a waterproof joint; constructing a secondary lining of the newly-built transfer passage to a deformation joint position, and reserving a steel bar connector for connecting the waterproof of a connection part and the connection of a new structure and an old structure of the secondary lining;

s3, according to the construction sequence of the newly-built transfer channel pilot tunnel, breaking side piles of the existing subway station in blocks from top to bottom; after the removal, the waterproof layer of the newly-built transfer passage is partially overlapped with the waterproof layer of the existing subway station, the overlapping range extends beyond the deformation joint, and building sealant is adopted for sealing; a water-swelling water stop strip is arranged at the lap joint part of the waterproof layer to form a waterproof partition; the connection part of the new and old structure is provided with a water-swelling water stop strip and a grouting pipe;

s4, constructing a closed ring frame structure;

and S5, breaking the side wall of the existing station corresponding to the range of the connection hole in a partitioning and blocking manner, and penetrating the existing subway station and the newly-built transfer passage.

7. The construction method according to claim 6, which is characterized in that: and (4) performing chiseling and bar planting on the top and the bottom of the connection hole finished in the step S5, pouring to form a reinforced ring beam, and constructing a residual structure of the newly-built transfer channel after finishing.

Technical Field

The invention relates to the related technical field of subway engineering building, in particular to an arched subway station building connection structure and a construction method.

Background

In recent years, with the acceleration of urbanization progress in China, a large number of people are poured into cities, so that the degree of urban population gathering is rapidly increased, some subways built and put into operation at early stage gradually have the problem that the requirements of passenger traveling and transfer cannot be met, and the targeted building of the subways is a fundamental method for solving the problems. The subway construction inevitably involves the problems of the removal of the existing structure, the connection of the existing structure and a newly-built structure and the like. The peripheral environment of subway engineering is generally complex, the requirements for controlling the deformation of the earth surface and the existing structure are strict, and the problem of safety risk is easily caused by repeated conversion of a stress system in the building construction process. If the building method is improper, the existing structure can be damaged, and serious engineering accidents can be caused.

CN 102943678B an arch subway station is new and old building and is linked up structure, in this technical scheme, the existing station of A number line links up with the newly-built station of B number line and forms the transfer station, and the opening in the side wall of the existing station of A number line forms the communicating passway of the newly-built station of B number line, includes: the tunnel comprises a tunnel opening, an arched top-bottom beam, a profile steel pull rod, a chemical screw and a wedge-shaped steel plate. A plurality of groups of chemical screw rods are oppositely arranged on the inner sides of the arched top and bottom beams in the range of the opening on the side wall of the existing station, a plurality of section steel pull rods with wedge-shaped steel plates fixed at two ends are fixedly connected with the corresponding chemical screw rods through the wedge-shaped steel plates, and the section steel pull rods are connected and fixed between the arched top and bottom beams at two sides of the arched top; a reinforcing ring beam is cast in situ between the outer side of the arched top-bottom beam in the opening range and the newly-built structure, the arched top-bottom beam and the reinforcing ring beam are fixedly connected by using chemical embedded bars, and the reinforcing ring beam forms a closed ring beam in the newly-built structure along the edge of the opening; after the side wall of the existing station of the line A is provided with a hole, a reinforced concrete beam bottom reinforcing layer is arranged below the bottom surface of the arched top-bottom beam and is combined with the bottom surface of the arched top-bottom beam into a whole; a section of side wall is reserved between two rectangular holes in the side wall of the existing station, a reinforced concrete column is attached to the newly built station, the upper end and the lower end of the reinforced concrete column are connected with the reinforcing ring beam, and the reserved side wall and the attached reinforced concrete column are combined to form the reinforcing column. The method for breaking the side wall of the existing station opening area in a segmented mode comprises the following steps: temporarily plugging the existing line station transfer section, transforming the pipeline on the upper part of the suspended ceiling of the existing line transfer section, and applying a profile steel pull rod at the foot part of the vault; constructing a primary support and a secondary lining of a station of the No. B line to the outer side of the side wall of the No. A line and tightly jacking the side wall of the No. A line; the side wall is divided into a plurality of areas at intervals, concrete protective layers on the inner side and the outer side of the side wall of the area I are chiseled, reserved steel bars needed by glass are chiseled, and concrete in the area 1 is cut in sequence according to the chiseling sequence.

Constructing a beam bottom reinforcing layer of the existing arched top and bottom beam in the area I; a temporary support system is additionally arranged by a scaffold, a reinforcing column is poured, and the scaffold is firmly anchored with a newly-built structure; after the structure I reaches the design strength, chiseling the concrete protective layers on the inner side and the outer side of the side wall of the area II, stripping off the required reserved reinforcing steel bars, and sequentially cutting the concrete of the area 2 according to the chiseling sequence; reserving temporary support of the area I, constructing a beam bottom reinforcing layer of an existing arched top-bottom beam in the area II, and erecting the temporary support of the area II by using a scaffold; after the structure of the area II reaches the design strength, sequentially performing hole opening and constructing a beam bottom reinforcing layer of the existing arched top-bottom beam on the area III in the same steps as the steps (4) and (5); the temporary support of each area is reserved, the existing line side wall structures of the IV area and the V area are excavated in sequence with the construction sequence of other areas, the existing arch top-bottom beam is reinforced as required, and the concrete of the No. A line side wall is cut into a size capable of being carried in a blocking mode through the static force of a diamond rope saw; and after the second lining of the underground excavation section structure is constructed, removing the temporary support after the concrete structure reaches the design strength.

In the prior art, a medium-sized steel pull rod needs to be constructed in an existing station, and normal operation of the station can be influenced; the construction process of the reinforced ring beam is complex, and the difficulty of erecting the template support is high, so that the pouring effect is difficult to ensure; meanwhile, the lateral deformation of the side wall of the existing station to the hole opening part cannot be effectively controlled in the existing scheme; the construction steps are complicated, the construction period is long, and the cost of consumed labor time is high.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides an arch subway station building connection structure and a construction method, which can realize the connection of a newly-built structure and an existing arch subway station and reduce the construction cost on the basis of ensuring the connection construction safety.

The invention adopts the technical scheme that the building and connecting structure for the arched subway station comprises an existing subway station, a newly-built transfer passage, an existing top arched edge beam, existing subway station side walls, a transfer passage primary support, a transfer passage top plate, a transfer passage bottom plate, a reinforcing column and a reinforcing ring beam.

The existing subway station is an existing PBA station, the existing top arch edge beam is a top arch structure of the existing subway station, and the existing subway station side wall is a lower structure of the existing subway station.

The bottom of the newly-built transfer passage is connected with the side wall of the existing subway station, and two first connecting points are arranged at the connecting position; the top of the newly-built transfer passage is connected with the existing arch edge beam, and two connection points II are arranged at the connection position;

two parallel reinforcing columns are arranged between the first two connection points and the second two connection points, the first connection point is of a reinforcing column and embedded steel bar connecting structure of an existing arch edge beam, the second connection point is of a reinforcing column and embedded steel bar connecting structure of an existing station side wall, and a closed ring frame structure is arranged between the first two connection points, the second two connection points and the two reinforcing columns.

Furthermore, the bottom and the top of the newly-built transfer channel are both provided with a transfer channel primary support, the transfer channel primary support at the bottom is provided with a transfer channel bottom plate, and the transfer channel primary support at the top is provided with a transfer channel top plate.

Furthermore, the reinforcing columns at the first connecting point and the second connecting point are fixedly connected with the existing arch edge beam and the existing side wall at the lower part of the station through embedded bars.

Furthermore, the newly-built transfer channel is of a single-span vault vertical wall section structure.

Compared with the prior art, the invention provides an arch subway station extension and connection structure and a construction method, wherein a closed ring frame structure is formed by connecting reinforcing columns with existing arch top side beams and lower side wall embedded bars, so that the communication and connection construction risk of new and old structures of underground engineering can be effectively reduced, and the arch subway station extension and connection structure and the construction method can be popularized and applied to underground engineering extension and construction; the invention provides an arched subway station building connection structure and a construction method, which are relatively simple in construction process and short in construction period, and save a large amount of labor and time expenditure on site.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic diagram of waterproof lap joint of a new structure and an old structure.

Fig. 3 is a schematic view of the reinforcement of the connection site of the present invention.

Fig. 4 is a partial sectional view of the connection site.

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

As shown in fig. 1-4, the invention provides an arch subway station building and connecting structure, which comprises an existing subway station 1, a newly-built transfer passage 2, an existing arch-shaped edge beam 3, existing subway station side walls 4, a transfer passage primary support 5, a transfer passage top plate 6, a transfer passage bottom plate 7, a reinforcing column 8 and a reinforcing ring beam 9.

The existing subway station 1 is an existing PBA station, the existing arch side beam 3 is an arch structure of the existing subway station 1, and the existing subway station side wall 4 is a lower structure of the existing subway station 1; the newly-built transfer passage 2 is of a single-span vault straight wall section structure, and the newly-built transfer passage 2 is constructed by adopting an underground excavation CRD method;

the bottom of the newly-built transfer passage 2 is connected with the side wall 4 of the existing subway station, and two connection points I are arranged at the connection position; the top of the newly-built transfer passage 2 is connected with the existing arch edge beam 3, and two connection points II are arranged at the connection position;

two parallel reinforcing columns 8 are arranged between the first two connection points and the second two connection points, the first connection point is of a reinforcing column 8 and embedded steel bar connecting structure of the existing arch-shaped edge beam 3, the second connection point is of a reinforcing column 8 and embedded steel bar connecting structure of the existing station side wall 4, and a closed ring frame structure is arranged between the first two connection points and the second two connection points and between the two reinforcing columns 8. And the two first connecting points and the two second connecting points are arranged along the length direction of the newly-built transfer passage 2.

Furthermore, the bottom and the top of the newly-built transfer channel 2 are provided with a transfer channel primary support 5, the transfer channel primary support 5 at the bottom is provided with a transfer channel bottom plate 7, and the transfer channel primary support 5 at the top is provided with a transfer channel top plate 6.

Further, the reinforcing columns 8 at the first connection point and the second connection point are fixedly connected with the existing arch edge beam 3 and the existing station lower side wall 4 through embedded bars 17.

The concrete construction steps are as follows:

s1, excavating the newly-built transfer channel 2 by adopting a subsurface excavation CRD method, and constructing the primary support 5 of the transfer channel to the outer side of the side wall 4 of the existing subway station;

s2, dismantling the temporary middle partition wall of the newly-built transfer channel 2 in sections, constructing a waterproof layer 10 of the newly-built transfer channel 2, and reserving a waterproof joint; constructing a secondary lining of the newly-built transfer passage 2 to a deformation joint position, and reserving a steel bar connector for connecting the waterproof of a connection part and the connection of a new structure and an old structure of the secondary lining;

s3, according to the construction sequence of the newly-built transfer passage pilot tunnel, the side piles 11 of the existing subway station 1 are broken in blocks from top to bottom. After the removal, the waterproof layer 10 of the newly-built transfer passage 2 is partially overlapped with the waterproof layer 12 of the existing subway station 1, the overlapping range extends beyond the deformation joint 13 (the length is 300mm), and the sealing is carried out by adopting building sealant; a water-swelling water stop strip 14 is arranged at the lap joint part of the waterproof layer to form a waterproof partition; the connection part of the new and old structure is provided with a water-swelling water stop strip 14 and a grouting pipe 15;

s4, determining the position of the connection hole 16 at the connection position of the new and old structure according to the design drawing, and constructing reinforcing columns 8 at two sides of the connection hole 16. The reinforcing column 8 is fixedly connected with the existing arch top edge beam 3 and the existing station lower side wall 4 through embedded bars 17 to form a closed ring frame structure;

s5, breaking the existing station side wall 4 corresponding to the range of the connection hole 16 in a partitioning and blocking manner, and penetrating through the existing subway station 1 and the newly-built transfer passage 2;

and (4) performing chiseling and bar planting 18 on the top and the bottom of the finished connecting hole 16 of S5, pouring to form a reinforcing ring beam 9, and then applying the residual structure of the transfer passage.

The invention provides an arch subway station building and connecting structure and a construction method, wherein a closed ring frame structure is formed by connecting reinforcing columns with existing arch top edge beams and lower side wall embedded bars, so that the risk of underground engineering new and old structure communication and connection construction can be effectively reduced, and the arch subway station building and connecting structure and the construction method can be popularized and applied to underground engineering building and construction; the invention provides an arched subway station building connection structure and a construction method, which are relatively simple in construction process and short in construction period, and save a large amount of labor and time expenditure on site.