CN107119711B - Connecting structure for large-range adjacent existing transfer station and construction method - Google Patents
Connecting structure for large-range adjacent existing transfer station and construction method Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 37
- 238000012546 transfer Methods 0.000 title claims abstract description 24
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 57
- 239000010959 steel Substances 0.000 claims description 57
- 230000002787 reinforcement Effects 0.000 claims description 36
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 30
- 238000013461 design Methods 0.000 claims description 25
- 238000003466 welding Methods 0.000 claims description 17
- 239000004576 sand Substances 0.000 claims description 13
- 238000009432 framing Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
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- 238000002513 implantation Methods 0.000 claims description 4
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Abstract
The invention discloses a connecting structure and a construction method for large-range adjacent existing transfer stations, wherein a reinforcing longitudinal beam and a reinforcing column are concrete cast-in-place structures, the reinforcing longitudinal beam and the reinforcing column are combined and connected with an existing structure through a bar planting technology, then a deformation joint is arranged between the reinforcing structure and a newly-built structure to complete the communication of a new structure and an old structure, and finally the safety of the existing structure is ensured through measures such as reinforcing structures, sectional static force removal and the like. Through covering and digging the newly-built station of the abutting portion on a large scale of inverse building, the layering connection technology in time provides the side direction support, can the existing station of strict control warp and guarantee existing structure safety. Meanwhile, the waterproof performance is greatly improved by additionally arranging the bottom plate concave longitudinal beam to increase the water seepage path at the deformation joint of the bottom plate, the existing structural deformation and internal force conversion are controlled very favorably, and the waterproof structure is particularly suitable for large-range adjacent engineering and engineering with complex surrounding environment.
Description
Technical Field
The invention belongs to the field of subway engineering, and particularly relates to a connection structure and a construction method for adjoining an existing transfer station in a large range.
Background
The construction of subways becomes one of effective ways for solving the problems of modern transportation, and with the continuous increase of the construction scale of urban subways, transfer stations occupy more and more important positions in urban rail transit networks. The transfer and different-phase construction of new and old subway lines necessarily involve the problem of connection between the later-constructed subway station and the existing subway station. When a designer designs a subway station, a transfer interface is generally reserved so as to facilitate the design and construction of the subsequent station.
Due to the fact that the development speed of modern cities is too fast, subway lines are constantly in an adjusting state, and transfer stations such as a building-up station of a Nanjing subway line-1 and line-4 transfer station sometimes appear under the condition that transfer conditions are not reserved. In such a project, if measures and methods for controlling the deformation of an existing station and chiseling an existing structure are not taken, the safety of the existing subway station is adversely affected. Especially when the subway transverse span is large and the surrounding environment is complex in later construction, the station with deformed existing structure can not be controlled by temporary support, the connection design and construction scheme are not reasonable, the existing structure can be irreversibly damaged, even engineering accidents are caused, and the safety of life and property of subway passengers is endangered.
Disclosure of Invention
The invention is provided for solving the problems in the prior art, and aims to provide a connecting structure and a construction method for adjoining the existing transfer station in a large range.
The technical scheme of the invention is as follows: a linking structure for large-range adjacent existing transfer stations comprises an existing station with a line A and a newly-built station with a line B, wherein the linking positions of the existing station and the newly-built station form the transfer stations, holes are continuously formed in the side wall of the existing station with the line A to form a plurality of passage ports communicated with the newly-built station with the line B, the passage ports comprise an opening of the existing structure, a top beam at a negative layer of opening, a top beam at a negative two-layer opening, a column at a negative layer of opening, columns at a negative two-layer opening, a temporary support column capable of applying axial force, a full-hall scaffold, a sand-filled steel pipe column inside the newly-built structure, a steel pipe column beam plate column connecting reinforcing ring, a steel pipe column reinforcing steel bar welding reinforcing ring, a steel pipe column bottom plate welding reinforcing ring, a bottom plate connecting ring beam and a plate, the temporary support columns in the temporary support columns and the full-hall scaffold are steel pipe supports, a jack is arranged in the temporary support columns and the full-hall scaffold, the steel pipe column reinforcing steel bar welding reinforcing ring is an annular plate formed by welding steel plates, and a newly-built station structural longitudinal beam and a beam reinforcing steel bar are welded on the reinforcing ring to ensure the stress of the reinforcing steel bar; the bottom plate connecting part concave ring beam in the bottom plate connecting part and the bottom plate connecting part concave ring beam in the plate are beams poured under the bottom plate of the newly-built structure, can be abutted against the existing building envelope, complete force transmission in the horizontal direction, and can be additionally provided with a water swelling water stop strip to enhance the waterproof capability of the bottom plate.
The roof, medium plate, the existing station bottom plate department outside of existing station respectively with the cast-in-place reinforcement longeron of new construction, the reinforcement longeron includes burden one deck reinforcement longeron and even board, burden two layers of reinforcement longerons and even board, bottom plate reinforcement longeron and even board, movement joint, implantation reinforcing bar, the cast-in-place burden one deck reinforcement post of reinforcement longeron department, burden two layers of reinforcement posts connect the reinforcement post reinforcing bar through the reinforcing bar connector at the layering contrary in-process of building.
The connecting structure is used for constructing fender piles, a sand-filled steel pipe column foundation and a sand-filled steel pipe column according to site conditions, constructing a station negative layer of reinforcing longitudinal beams and a connecting plate to complete top plate connection, reserving a negative layer of reinforcing column reinforcing steel bar interface through a steel bar connector, backfilling and covering soil after the top plate reaches the design strength, excavating earthwork layer by layer in downward reverse construction, constructing and newly building a station negative layer of side walls, a middle plate, negative two layers of reinforcing longitudinal beams, a connecting plate and a negative layer of reinforcing columns, and reserving a negative two layers of reinforcing column reinforcing steel bar interfaces through the steel bar connector; after the middle plate reaches the design strength, excavating earthwork layer by layer in a downward reverse construction mode, and constructing a negative second-layer side wall, a bottom plate concave longitudinal beam, a connecting plate and a negative second-layer reinforcing column of the station; after the bottom plate reaches the design strength, temporary support columns and full framing scaffolds are erected on the negative layer and the negative layer of the existing station, and then the side walls of the existing station area in the entrance to the cave area are broken in sections.
The construction method of the connection structure for the large-range adjacent existing transfer station comprises the following steps:
site arrangement, building a station column pile foundation and embedding and filling a sand steel pipe column in the later construction period;
(ii) excavating a soil body to a top plate of the newly-built structure, chiseling partial concrete of a top plate part of a main structure of the existing station structure enclosure structure, reserving reinforcing steel bars of the top plate part, and implanting embedded reinforcing steel bars into the top plate of the existing station;
(iii) excavating a soil layer to the position below a newly-built structure top plate, laying a later-stage station top plate, beam and column reinforcing steel bars, constructing a layer of reinforcing longitudinal beam, a layer of connecting plate and a layer of reinforcing column at the position of a side wall at the connecting part of the existing structure, reserving the reinforcing steel bars for connection, setting a deformation joint, pouring concrete, completing the connection with the existing station structure top plate, backfilling the top plate and covering soil when the concrete strength meets the design requirement, and recovering the station top surface to be normal;
(iv) excavating a soil layer to a position below a middle plate of a newly-built structure, constructing a station middle plate in the later construction stage, removing grooves on the existing enclosure structure, filling the space at the lower part of the middle plate bottom by using a micro-expansion concrete beam, connecting the later-built station with the existing station enclosure structure, and ensuring the force transmission of the middle plate in the horizontal direction;
(v) chiseling an existing station structure enclosure structure above a newly-built station middle plate, constructing a reinforcing steel bar connector which is used for loading a second-layer reinforcing longitudinal beam and a connecting plate at the position of a side wall at the connecting part of the existing structure, loading a first-layer reinforcing longitudinal beam and a connecting plate, reserving a second-layer reinforcing column, setting a deformation joint, pouring concrete, and completing the connection with the existing station main structure middle plate;
(vi) after the middle plate concrete in the step (v) reaches the design strength, excavating a soil layer to the position below a newly-built structure bottom plate, constructing the newly-built structure bottom plate, picking grooves on the existing station enclosure structure, and embedding a concave ring beam and a plate at the joint of the construction bottom plate into the existing station enclosure structure to ensure that the horizontal force transmission is carried out at the bottom plate;
(vii) chiseling an existing station enclosure structure above a newly-built station bottom plate, constructing a bottom plate reinforcing longitudinal beam, a connecting plate and a negative two-layer reinforcing column at the position of a side wall at the connecting part of the existing structure, setting a deformation joint, and pouring concrete to complete the connection with the existing station main body structure bottom plate;
(viii) building temporary supporting columns and full framing scaffolds inside the existing station;
(ix) after the strength of the concrete of the joined structure reaches the strength required by design, chiseling a negative layer side wall of the existing structure in a segmented manner, reserving reinforcing columns at the wall and reinforcing steel bars at the beam column part, and constructing a top beam at a negative layer hole;
(x) after the first layer of roof beam concrete of burden reaches the design requirement intensity, chiseling out two layers of side walls on the existing structure burden in segments, reserving wall and beam column position reinforcing steel bars at the position of the reserved reinforcing column, constructing the back timber at the position of the second layer of opening of the burden, dismantling the temporary support post and the full framing scaffold after the strength of the second layer of concrete of burden meets the design requirement, and completing the connection with the existing A line.
The invention has the following beneficial effects:
(1) the deformation of the existing station is strictly controlled by adopting cover excavation and inverse construction and utilizing the lateral rigidity of a newly-built structure.
(2) The existing structure is connected in a mode of reversely building and layering through the cover and the digger, so that the internal force change of the existing structure is converted step by step, and the stress is more reasonable.
(3) The reinforcing structure and the temporary upright post support are firstly constructed, and the vertical deformation and the safety of the existing structure are strictly ensured.
(4) The existing structure is broken by segmentation and layering, and the stress conversion of the existing structure is more powerful.
(5) And a static force breaking scheme is adopted, so that the noise pollution is low.
(6) And the cover-digging and top-down construction is adopted, so that the influence on the surrounding environment and the traffic is small.
Drawings
FIG. 1 is a schematic illustration of the location of new and existing structures in the present invention;
FIG. 2 is a cross-sectional view of the O-O cross-section of FIG. 1;
FIG. 3 is a schematic view showing the assembly of a sand-packed steel pipe column according to the present invention;
FIG. 4 is a schematic structural view of a steel pipe column, a beam and a plate column connection reinforcing ring according to the present invention;
FIG. 5 is a schematic structural view of a steel pipe column reinforcement welding reinforcement ring according to the present invention;
FIG. 6 is a schematic structural view of a steel bar welding reinforcement ring of a bottom plate of a steel column in the present invention;
FIG. 7 is a schematic view of the welding of the steel bars and the steel columns of the newly-built longitudinal beams and the cross beams of the structure;
FIGS. 8 to 17 are construction process diagrams of the construction method of the present invention;
wherein:
1 carrying one layer of top beam at the hole opening and 2 carrying two layers of top beams at the hole opening
3 existing 4 negative layer hole pillars of station floor
5-load two-layer opening column 6-load one-layer reinforcing longitudinal beam and connecting plate
7 burden two layers of reinforcement longerons and even 8 bottom plate reinforcement longerons of board and even board
9 negative layer of reinforced column and 10 negative layer of reinforced column
11 deformation joint 12 sand-filled steel pipe column
13 sunken ring roof beam and board 14 existing station structure envelope in bottom plate junction
15 steel pipe column beam plate column connection reinforcing ring 16 steel pipe column steel bar welding reinforcing ring
17 steel pipe column bottom plate steel bar welding reinforcing ring 18 implantation steel bar
19 steel bar connector 20 micro-expansion concrete beam
21 newly-built structure top plate 22 newly-built structure middle plate
23 newly-built structure bottom plate
24 temporary support column and full framing scaffold
25 meet water inflation sealing rod 26 and fill sand steel pipe column foundation
0 hole.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings and examples:
as shown in fig. 1 to 7, a connection structure for large-scale adjacent existing transfer stations comprises an existing station with a line a and a newly-built station with a line B, wherein the connection position of the existing station with the line a and the newly-built station with the line B forms the transfer station, holes are continuously formed in the side wall of the existing station with the line a to form a plurality of passage ports communicated with the newly-built station with the line B, the passage ports comprise an opening 0 at the existing structure position, a top beam 1 at a position minus one layer of opening, a top beam 2 at a position minus two layers of opening, a column 4 at a position minus one layer of opening, columns 5 at a position minus two layers of opening, temporary support columns and full framing scaffold 24 capable of applying axial force, a steel-pipe sand-filled steel pipe column 12 inside the newly-built structure position, a steel-pipe column-slab column connection reinforcement ring 15, a steel-pipe column steel bar welding reinforcement ring 16, a steel pipe column-slab steel bar welding reinforcement ring 17, a bottom slab connection concave ring beam and slab 13 at the bottom plate connection position, the temporary support columns and the temporary support columns in the full framing scaffold 24 are steel pipes, a jack is arranged in the middle of the steel pipe column, the jack can be timely applied to the side wall when the side wall is detached, the steel pipe column steel bar welding reinforcing ring 16 is an annular plate formed by welding steel plates, and the longitudinal beam and the cross beam steel bar of the newly-built station structure are welded on the reinforcing ring, so that the stress of the steel bar is ensured; the bottom plate connecting part concave ring beam and the bottom plate connecting part concave ring beam in the plate 13 are beams poured under the bottom plate of a newly-built structure, can be abutted against an existing building envelope, complete force transmission in the horizontal direction, and can be additionally provided with a water swelling water stop strip 25 to enhance the waterproof capability of the bottom plate.
The roof of existing station, medium plate, 3 outsides of existing station bottom plate respectively with the cast-in-place reinforcement longeron of newly-built structure, the reinforcement longeron is including burden one deck reinforcement longeron and even board 6, two layers of reinforcement longerons of burden and even board 7, bottom plate reinforcement longeron and even board 8, movement joint 11, implantation reinforcing bar 18, the cast-in-place burden one deck reinforcement post 9 of reinforcement longeron department, two layers of reinforcement posts 10 of burden are built the in-process in the layering in reverse and are plugged into the ware 19 connection reinforcement post reinforcing bars through the reinforcing bar.
The connection structure is used for constructing fender piles, a sand-filled steel pipe column foundation 26 and a sand-filled steel pipe column 12 according to site conditions, constructing a station negative layer of reinforcing longitudinal beams and a connecting plate 6 to complete top plate connection, reserving a reinforcing steel bar interface of a negative layer of reinforcing column 9 through a reinforcing steel bar connector 19, backfilling and earthing after the top plate reaches design strength, excavating earthwork layer by layer downwards in a reverse mode, constructing and newly building a station negative layer of side walls, a middle plate, a negative two layer of reinforcing longitudinal beams, a connecting plate 7 and a negative layer of reinforcing column 9, and reserving a reinforcing steel bar interface of a negative two layer of reinforcing column 10 through the reinforcing steel bar connector 19; after the middle plate reaches the design strength, excavating earthwork layer by layer in a downward reverse operation manner, and constructing a negative second layer side wall, a bottom plate concave longitudinal beam, a connecting plate 13 and a negative second layer reinforcing column 10 of the station; after the bottom plate reaches the design strength, temporary support columns and full framing scaffolds 24 are erected on the negative layer and the negative layer of the existing station, and then the side walls of the existing station area in the entrance to the cave area are broken in sections.
As shown in fig. 8 to 17, a construction method of a joining structure adjoining an existing transfer station in a wide range includes the steps of:
site arrangement, building a station pile foundation and burying and filling the sand steel pipe column 12 in the later construction period; as shown in fig. 8.
And (ii) excavating soil body to the newly-built structure top plate 21, chiseling partial concrete of the existing station structure enclosure structure 14 and the main structure top plate, reserving the steel bars of the concrete, and implanting the implanted steel bars 18 into the existing station top plate, as shown in fig. 9.
(iii) excavating a soil layer to the position below a newly-built structure top plate 21, laying a later-stage construction station top plate, beam and column reinforcing steel bars, constructing a reinforcing longitudinal beam layer and a connecting plate 6 at the position of a side wall at the connecting part of the existing structure, and a reinforcing column layer 9, reserving a reinforcing steel bar connection 19, setting a deformation joint 11, pouring concrete, completing the connection with the existing station structure top plate, backfilling the top plate and earthing, and recovering the station top surface to be normal when the concrete strength meets the design requirement, as shown in figure 10.
(iv) excavating a soil layer to the position below a middle plate 22 of the new construction, constructing a station middle plate in the later construction stage, removing grooves on the existing enclosure structure, filling the space at the lower part of the middle plate bottom by using a micro-expansion concrete beam 20, connecting the post-construction station with the existing station enclosure structure, and ensuring that the middle plate transmits force in the horizontal direction, as shown in fig. 11.
(v) chiseling the existing station structure enclosure structure 14 above the middle plate of the newly-built station, constructing a reinforcing steel bar connector 19 which is used for connecting the side wall of the existing structure with the negative two-layer reinforcing longitudinal beam and the connecting plate 7, the negative one-layer reinforcing longitudinal beam and the connecting plate 6 and reserving the negative two-layer reinforcing columns, arranging a deformation joint 11, pouring concrete, and finishing the connection with the middle plate of the existing station main structure, as shown in fig. 12.
And (vi) after the middle plate concrete in the step (v) reaches the design strength, excavating a soil layer to a position below a new structure bottom plate 23, constructing the new structure bottom plate 23, removing grooves on the existing station enclosure structure, and embedding the ring beam and the plate 13 which are recessed at the joint of the construction bottom plate into the existing station enclosure structure to ensure that the horizontal force is transferred at the bottom plate, as shown in fig. 13.
(vii) chiseling the existing station enclosure structure above the newly-built station bottom plate, constructing the bottom plate reinforcing longitudinal beam and connecting plate 8 at the position of the side wall of the connecting part of the existing structure, constructing the negative two-layer reinforcing column 10, arranging the deformation joint 11, pouring concrete, and completing the connection with the existing station main structure bottom plate, as shown in fig. 14.
(viii) building temporary support columns and full scaffolding 24 inside the existing station, as shown in fig. 15.
(ix) after the strength of the concrete of the joined structure reaches the strength required by design, chiseling a negative layer side wall of the existing structure in a segmented manner, reserving the wall at the position of the reserved reinforcing column and reinforcing steel bars at the position of the beam column, and constructing a top beam 1 at the position of a negative layer opening, as shown in fig. 16.
(x) after the negative one-layer top beam concrete reaches the strength required by the design, chiseling out the negative two-layer side wall of the existing structure in a segmented manner, reserving the reinforcing post position wall and the beam post position reinforcing steel bars, constructing the negative two-layer opening position top beam 2, dismantling the temporary supporting upright post and the full scaffold 24 after the negative two-layer concrete reaches the strength required by the design, and completing the connection with the existing line A, as shown in fig. 17.
Example 1
The method is used in the design and construction of a transfer station of No. 1 and No. 4 lines of a certain subway. Due to the adjustment of the track wire net, the No. 4 wire and the No. 1 wire are transferred under the condition that the transfer is not reserved in the drum building station, and therefore the side wall of the existing No. 1 wire needs to be broken in a large area for transfer and communication. No. 1 line is an existing underground three-layer station, and No. 4 line is a newly-built underground two-layer station. A No. 1 line building enclosure adopts a hole digging cast-in-place pile, and a box type concrete structure with a main structure of 210.7m in length, 23.05m in width and 21m in depth. The width of a foundation pit at the joint of the No. 4 line is 49.4m, and the length is 112 m.
The main technical difficulties are as follows: firstly, the main body open cut section is closely attached to the existing No. 1 line structure, and if a foundation pit is directly excavated, the structure of the existing No. 1 line is adversely affected; processing between new and old structures, including connection between concrete structures, deformation joint arrangement, structural waterproofing and the like; and the large-area removal of the side wall of the existing structure of the No. 1 line has certain influence on the structure and operation of the No. 1 line station, so that how to refine the reinforcement design and the improvement of the No. 1 line structure is crucial to increase the social and economic benefits and reduce the influence degree of the No. 1 line operation.
After the design is demonstrated for many times, the invention method shown in the text is adopted for design and construction. The enclosure structure adopts a supporting mode of piles and anchor cables, the length of the covered and excavated segment is 26m, and the length of the open-cut and broken segment is 86 m. The on-site construction experience, the monitoring data and the existing station operation monitoring data are fully proved: the safety of the existing station deformation meter structure can be strictly controlled by adopting a cover-excavation top-down construction method and utilizing the lateral rigidity and the layered connection technology of a newly-built structure; the existing structure is reinforced in advance by the reinforcing structure, the temporary supporting upright columns are arranged, and the displacement of the drilled hole can be controlled by sectional breaking, so that the structural damage is avoided; the steel bar planting technology and the reserved steel bar connection technology are mature, and the construction quality can be guaranteed; the static force cutting scheme is low in noise, and is beneficial to environmental protection and civilized construction.
The invention can be widely popularized to the reconstruction and extension engineering of subway stations, is particularly suitable for large-span newly-built station engineering, and can ensure that the engineering is safer and more economic.
Claims (3)
1. The utility model provides an adjoin existing transfer station's linking structure on a large scale, includes the new station of building of the existing station of A number line and B number line, and the two department of linking forms the transfer station, opens the hole in succession on the side wall of the existing station of A number line, forms and newly builds communicating a plurality of passports of station, its characterized in that with B number line: the passage opening comprises an opening (0) of an existing structure, a negative layer opening top beam (1), a negative two-layer opening top beam (2), a negative one-layer opening pillar (4), a negative two-layer opening pillar (5), a temporary support pillar and a full framing scaffold (24) capable of applying axial force, a sand-filled steel pipe pillar (12) inside a newly-built structure, a steel pipe pillar-beam-plate-column connecting reinforcing ring (15), a steel pipe pillar reinforcing steel bar welding reinforcing ring (16), a steel pipe pillar-bottom plate reinforcing steel bar welding reinforcing ring (17), a bottom plate connecting part concave ring beam and a bottom plate (13), wherein the temporary support pillar and the temporary support pillar in the full framing scaffold (24) are steel pipe supports, a jack is arranged in the middle of the temporary support pillar and the temporary support pillar, the temporary support pillar and the steel pipe column reinforcing steel bar welding reinforcing ring can be timely applied to the side wall when the side wall is dismounted, the steel pipe pillar reinforcing steel bar welding reinforcing ring (16) is a steel plate welded, and a newly-built longitudinal beam and a transverse beam ring are welded on the reinforcing ring, the stress of the steel bar is ensured; the bottom plate connecting part concave ring beam in the bottom plate connecting part and the bottom plate connecting part concave ring beam in the plate (13) are beams poured under the bottom plate of a newly-built structure, can be abutted against an existing building envelope to finish force transmission in the horizontal direction, and can be additionally provided with a water swelling water stop strip (25) to enhance the waterproof capacity of the bottom plate.
2. A connection structure for adjoining an existing transfer station in a wide range according to claim 1, wherein: the roof of existing station, medium plate, existing station bottom plate (3) locate the outside respectively with the cast-in-place reinforcement longeron of new construction, the reinforcement longeron includes burden one deck reinforcement longeron and even board (6), burden two layers of reinforcement longerons and even board (7), bottom plate reinforcement longeron and even board (8), movement joint (11), implantation reinforcing bar (18), the cast-in-place burden one deck reinforcement post (9), burden two layers of reinforcement post (10) of reinforcement longeron department are plugged into the ware (19) through the reinforcing bar and are connected the reinforcement post reinforcing bar in the layering contrary process of building.
3. A joining structure of a wide range adjoining an existing transfer station as claimed in claim 1, wherein: the connection structure is used for constructing fender piles, a sand-filled steel pipe column foundation (26) and a sand-filled steel pipe column (12) according to site conditions, constructing a station negative one-layer reinforcing longitudinal beam and a connecting plate (6) to complete top plate connection, reserving a negative one-layer reinforcing column (9) reinforcing steel bar interface through a reinforcing steel bar connector (19), backfilling and earthing after the top plate reaches the design strength, excavating earthwork layer by layer in downward reverse construction, constructing a newly-built station negative one-layer side wall, a middle plate, a negative two-layer reinforcing longitudinal beam, a connecting plate (7) and a negative one-layer reinforcing column (9), and reserving a negative two-layer reinforcing column (10) reinforcing steel bar interface through the reinforcing steel bar connector (19); after the middle plate reaches the designed strength, excavating earthwork layer by layer in a downward reverse operation manner, and constructing a negative two-layer side wall, a bottom plate concave longitudinal beam, a connecting plate (13) and a negative two-layer reinforcing column (10) of the station; after the bottom plate reaches the design strength, temporary support columns and full framing scaffolds (24) are erected on the negative layer and the negative layer of the existing station, and then the side walls of the existing station area in the entrance to the cave area are broken in sections.
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| CN201710545302.0A CN107119711B (en) | 2017-07-06 | 2017-07-06 | Connecting structure for large-range adjacent existing transfer station and construction method |
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| CN201710545302.0A CN107119711B (en) | 2017-07-06 | 2017-07-06 | Connecting structure for large-range adjacent existing transfer station and construction method |
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| CN107119711B true CN107119711B (en) | 2022-09-06 |
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