CN114458042B - Construction method for newly-built plate above rail-mounted area of existing subway station - Google Patents
Construction method for newly-built plate above rail-mounted area of existing subway station Download PDFInfo
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- CN114458042B CN114458042B CN202210161519.2A CN202210161519A CN114458042B CN 114458042 B CN114458042 B CN 114458042B CN 202210161519 A CN202210161519 A CN 202210161519A CN 114458042 B CN114458042 B CN 114458042B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0266—Enlarging
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Abstract
The invention discloses a construction method of a newly built plate above a rail-mounted area of an existing subway station, which comprises the following steps: removing the decorative surface layer of the side wall of the rail running area of the existing subway station; a first bracket is installed at the exposed side wall structure surface newly-built plate elevation by bar planting and drilling; chiseling a station board where a column structure is located in the range of the newly built plate, welding steel columns on beams where column feet are located, and welding second brackets on elevations of the newly built plate of the steel columns; during the shutdown of the rail running area of the existing subway station, installing steel beams on the first bracket and the second bracket; the method comprises the steps of constructing a steel hanging die, wherein the steel hanging die comprises a steel keel and a steel platform bottom die, a plurality of U-shaped suspenders are installed on a steel beam in a back-off manner, the lower ends of the U-shaped suspenders are connected through steel base plates, and the steel keel and the steel platform bottom die are sequentially arranged on the steel base plates from bottom to top; binding newly-built plate steel bars and beam bars above the bottom die of the steel platform, and pouring the concrete of the steel platform; and dismantling the steel backing plate, the steel joist and the steel platform bottom die. The new plate manufactured by the method has the advantages of firmness, durability, good fireproof performance and the like.
Description
Technical Field
The invention relates to the field of underground building engineering, in particular to a construction method of a newly built plate above a rail running area of an existing subway station.
Background
With the continuous development of cities, the subway line network gradually increases encryption lines from the original backbone line, then forms a ring network, and forms a radial net shape, a radial ring shape, a chessboard radial shape and the like in the whole city. Through the four-way subway, people can reach any corner of the city in a short time. In the rapid development and evolution of urban and rail transit, a new line station and an old line station need to be transferred, the old station is limited by construction time, process limitation and surrounding complex environments, capacity expansion cannot be carried out to an external space, the old line station needs to be modified, a new line transfer channel is communicated with an existing station hall plate, a new station hall plate is built above a track area, after the new station hall plate is completed, a hole is formed on a side wall, passengers enter the new station hall plate from the new transfer channel, and enter the old line station hall plate through a step ladder to realize transfer function, so that the new station hall plate is built above the track area under the condition of ensuring that subway trains are not stopped, and the problem that we need to solve is ensured to be solved in the construction process of the station hall plate.
In order to ensure that a new slab above a lower rail running area of a train is constructed, under the condition of train passing, the prior construction technology is that a newly-added station hall layer is mainly realized by implanting steel bars into concrete cylinders in the middle parts of side walls and stations as anchor bars for connecting steel corbels, a steel beam is connected with the steel corbels through high-strength bolts to form a bidirectional steel frame, and the span of a floor slab is reduced by a newly-added secondary beam with one end connected with the steel corbels on the side walls and the other end connected with a steel frame beam, wherein the floor slab is realized by adopting a form of pouring concrete or a steel truss floor carrier plate on a profiled steel plate. The surface of the steel structure is protected by spraying concrete with the thickness of not less than 50. The structure has the characteristics of small disassembly and modification reinforcement amount, high construction speed and the like on the premise of ensuring uninterrupted safe operation of the existing subway line without supporting the templates. However, after the construction is completed, the profiled steel sheet exposes the surface of the gap, has poor fire resistance and cannot meet the fire-proof requirements of the existing operation companies.
Therefore, a new construction method for building a station hall plate above a track area with high construction speed and good fire resistance is sought to optimize and improve the defects of the prior art, and the safe operation of subways is ensured, which is very necessary and urgent.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a construction method of a newly-built plate above a rail-mounted area of an existing subway station, and the construction method has the advantages of firmness, durability and good fireproof performance.
The technical scheme adopted is as follows: a construction method of a newly built plate above a rail-mounted area of an existing subway station comprises the following steps:
removing the decorative surface layer of the side wall of the rail running area of the existing subway station, and exposing the surface of the side wall structure;
drilling a mounting anchor bolt at the elevation of the newly-built plate, and mounting a first bracket, wherein the first bracket is vertical to the surface of the side wall structure;
chiseling a station plate where a column structure is located in the range of the new building plate, welding a steel column on a beam-planting bar mounting base where a column foot is located, and welding a second bracket on the steel column corresponding to the elevation of the new building plate, wherein the direction of the second bracket is opposite to that of the adjacent steel column arranged on the inner side of the track area;
during the outage of the rail running area of the existing subway station, installing steel beams on the first bracket and the second bracket;
the method comprises the steps of constructing a steel hanging die, wherein the steel hanging die comprises a steel keel and a steel platform bottom die, a plurality of U-shaped suspenders are installed on a steel beam in a back-off manner, the lower ends of the U-shaped suspenders are connected through steel base plates, and the steel keel and the steel platform bottom die are sequentially arranged on the steel base plates from bottom to top;
binding newly-built plate steel bars and beam bars above the bottom die of the steel platform, and pouring the concrete of the steel platform;
and dismantling the steel backing plate, the steel joist and the steel platform bottom die.
Preferably, in the step of chiseling the station board where the column structure is located in the range of the newly built plate, an electric cutting machine is adopted to remove the station board below the existing column structure and the decoration surface layer of the existing column structure, and the existing beam structure bottom plate and the surface of the existing column structure are leaked.
Preferably, the steel column is divided into a plurality of sections, and the first section at the bottom is connected with the existing beam structure bottom plate by high-strength bolts.
Preferably, the electric hoist is used for hoisting the steel columns except the first section at the bottom, and the hoisting point is arranged at 1/3 of the upper end of each section of the steel column.
Preferably, in the process of hoisting the steel columns, the lower ends of the steel columns are connected with the cable ropes, and the control direction is in place.
Preferably, in the process of hoisting the steel column, two 90-degree theodolites are used for detecting the verticality of the steel column, then the steel beam is installed in place, and after the steel beam is connected with the existing beam structure through high-strength bolts, the verticality and the levelness are checked again through the theodolites until no errors exist.
Preferably, the steel beam is an H-shaped steel beam.
Preferably, after the steel backing plate, the steel joist and the steel platform bottom die are removed, stone is hung outside the steel column in a dry mode to restore the decorative surface.
By adopting the technical scheme, the invention has the following beneficial effects:
1. the newly-built plate structure of the track area adopts a steel reinforced concrete structure, the structure is made of steel bars and concrete, the steel bars bear tensile force, and the concrete bears compressive force, so that the newly-built plate structure has the advantages of firmness, durability, good fireproof performance, steel saving, low cost and the like compared with a steel structure;
2. the hanging formwork construction is used as a reinforcing steel bar binding construction platform and a concrete mould, and under the normal running of a train, the normal running of a rail running area is ensured, and the construction progress is processed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic installation diagram of a first bracket in a construction method of a newly-built slab above a rail-mounted area of an existing subway station according to an embodiment of the present invention.
Fig. 2 is a schematic installation diagram of a steel column and a second bracket in the construction method of a newly-built slab above a rail-mounted area of an existing subway station according to the embodiment of the present invention.
Fig. 3 is a schematic view of a portion of a first section of steel column welded to a beam-bar-planting mounting base where the column foot is located in fig. 2.
Fig. 4 is a partial schematic view of the second bracket of fig. 2.
Fig. 5 is a top view of fig. 2.
Fig. 6 is a schematic installation diagram of a steel girder and brackets in a construction method of a newly-built slab above a rail-mounted area of an existing subway station according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of a construction steel platform in the construction method of a newly built slab above a rail-mounted area of an existing subway station according to an embodiment of the present invention.
Fig. 8 is a schematic diagram of a steel hanging die applied in the construction method of a newly built plate above a rail-mounted area of an existing subway station according to an embodiment of the present invention.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 1 to 8, the embodiment of the invention provides a construction method of a newly built plate above a rail-mounted area of an existing subway station, which mainly comprises the following steps:
the first step: and removing the decorative surface layer and the nine-hole bricks of the side wall of the track area of the existing subway station, and after exposing the surface of the side wall structure, planting ribs at the elevation of the newly-built plate of the side wall of the track area, drilling and installing anchor bolts, and installing first bracket 11, wherein the first bracket 11 is vertical to the surface of the side wall structure 10, as shown in figure 1.
And a second step of: chiseling a station board where a column structure is located in the range of a new building plate, installing a base 12 on a beam planting bar where a column foot is located, welding a steel column 13 on the base, welding a second bracket 14 on the steel column 13 corresponding to the elevation of the new building plate, wherein the direction of the second bracket 14 is opposite to that of the adjacent steel column 13 arranged on the inner side of a track area, and the elevation of the second bracket 14 is consistent with that of the first bracket 11.
Specifically, in this step, as shown in fig. 2 to 5, the station boards below the existing column structure and the decoration surface layer of the existing column structure are removed by an electric cutting machine, the existing beam structure bottom plate and the existing column structure surface are leaked, the removal size is 1.40m×1.35m×0.2m, the steel bar construction is carried out after the base surface is treated, the steel bars with the diameter of 25mm are used for the steel bar construction, the steel bar depth of 700mm is used for the steel bar construction, 200 steel columns are used in total, the steel columns 13 are multi-section steel columns, and the first section at the bottom is connected with the existing beam structure bottom plate steel bar and the main beam end plate by adopting high-strength bolts (pressure-bearing type).
When the steel column is installed in place, the steel column is firstly put in place, the H-shaped steel column is hoisted by adopting the electric hoist, when the steel column is hoisted, the hoisting point is required to be at 1/3 of the upper end of the steel column, and the lower end of the steel column is put in place by using a cable wind to control the direction. And (3) detecting the verticality of the steel column by using two 90-degree theodolites, then installing the section steel beam in place, and checking the verticality and the levelness by using the theodolites after the steel column is connected with the high-strength bolts (bearing type) of the main beam until no errors exist.
And a third step of: during the shutdown period of the rail running area of the existing subway station, for example, after the train is stopped at night, steel beams 15 are installed on the first bracket 11 and the second bracket 14, and the steel beams can be H-shaped steel beams which are fully welded with end plates of the first bracket 11 and the second bracket 14 as shown in fig. 6.
Fourth step: the steel hanging die is applied, the steel hanging die comprises two parts of a profile steel keel 16 and a steel platform bottom die 17, a plurality of U-shaped suspenders 18 are installed on the steel beam 15 in a back-off mode, the lower ends of the U-shaped suspenders 18 are connected through steel base plates 19, and the profile steel keel 16 and the steel platform bottom die 17 are sequentially arranged on the steel base plates 19 from bottom to top, as shown in fig. 7 and 8. Specifically, 25 HN100 steel keels (namely steel keels) are adopted as main keels of the template of the steel platform, the steel keels are equally distributed in the north-south direction according to the span size of the hanging plate, the distance is 1200mm, 10 hanging rods 18 are arranged on each main keel through a customized 25U-shaped hanging rod 18 and hung on an H-shaped steel beam 15 of a new plate, the distance is 600mm, a steel platform bottom die 17 is made of a 10mm thick steel plate, the steel platform bottom die 17 penetrates through the hanging rods 18, the HN100 steel keels 16 are installed to be propped under the steel platform bottom die 17, a steel base plate 19 is arranged under the steel keels 16, the steel base plate 19 penetrates through the hanging rods 18, and nuts are arranged on the hanging rods 18 to fix the steel base plate 19 and the steel keels 16.
Fifth step: binding newly-built plate steel bars and beam steel bars above the bottom die of the steel platform, and pouring the concrete of the steel platform.
Sixth step: dismantling the steel backing plate, the steel joist and the steel platform bottom die, and dry-hanging stone outside the steel column to recover the decorative surface.
The invention provides a construction method of a newly-built plate above a rail-mounted area of an existing subway station, and particularly provides a construction method of the newly-built plate, wherein the newly-built plate is of a steel reinforced concrete structure, a column decoration surface and a plate surface of an original structure on one side of an adjacent rail-mounted area are broken, a steel column is wrapped Shi outside a beam where the column is located, a bracket is arranged at the elevation of the newly-built plate of the steel column, meanwhile, a wall body at the elevation of the newly-built plate of the rail-mounted area is provided with an anchor bolt according to the bracket, after all construction is completed, brackets are arranged between the steel column and the steel column according to transverse steel beams at certain intervals, after the steel beams are installed on the rail-mounted area, a lifting platform is arranged, and after the platform is installed, steel bars are bound, concrete is poured.
Compared with the prior art, the invention has the following advantages:
1. the newly-built plate structure of the track area adopts a steel reinforced concrete structure, the structure is made of steel bars and concrete, the steel bars bear tensile force, and the concrete bears compressive force, so that the newly-built plate structure has the advantages of firmness, durability, good fireproof performance, steel saving, low cost and the like compared with a steel structure;
2. the hanging die construction is used as a reinforcing steel bar binding construction platform and a concrete die, and under the normal running of a train, the normal running of a rail running area is ensured, and the construction progress is processed.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "vertical", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and yet fall within the scope of the invention.
Claims (8)
1. The construction method of the newly-built plate above the rail-mounted area of the existing subway station is characterized by comprising the following steps:
removing the decorative surface layer of the side wall of the rail running area of the existing subway station, and exposing the surface of the side wall structure;
drilling a mounting anchor bolt at the elevation of the newly-built plate, and mounting a first bracket, wherein the first bracket is vertical to the surface of the side wall structure;
chiseling a station plate where a column structure is located in the range of the new building plate, welding a steel column on a beam-planting bar mounting base where a column foot is located, and welding a second bracket on the steel column corresponding to the elevation of the new building plate, wherein the direction of the second bracket is opposite to that of the adjacent steel column arranged on the inner side of the track area;
during the outage of the rail running area of the existing subway station, installing steel beams on the first bracket and the second bracket;
the method comprises the steps of constructing a steel hanging die, wherein the steel hanging die comprises a steel keel and a steel platform bottom die, a plurality of U-shaped suspenders are installed on a steel beam in a back-off manner, the lower ends of the U-shaped suspenders are connected through steel base plates, and the steel keel and the steel platform bottom die are sequentially arranged on the steel base plates from bottom to top;
binding newly-built plate steel bars and beam bars above the bottom die of the steel platform, and pouring the concrete of the steel platform;
and dismantling the steel backing plate, the steel joist and the steel platform bottom die.
2. The construction method of a new slab above a rail-mounted area of an existing subway station according to claim 1, wherein in the step of chiseling out the station boards where the column structures are located in the range of the new slab, an electric cutter is used to remove the station boards below the existing column structures and the decoration surface layers of the existing column structures, and the existing beam structure bottom plate and the existing column structure surfaces are leaked out.
3. The construction method of a newly built plate above a rail running area of an existing subway station according to claim 2, wherein the steel column is divided into a plurality of sections, and the first section at the bottom is connected with the reinforcement bar of the bottom plate of the existing beam structure by high-strength bolts.
4. The construction method of a newly built plate above a rail-mounted area of an existing subway station according to claim 3, wherein steel columns except for a first section at the bottom are hoisted by adopting an electric hoist, and a hoisting point is arranged at 1/3 of the upper end of each section of steel column.
5. The construction method of a newly built plate above a rail-mounted area of an existing subway station according to claim 4, wherein in the process of hoisting steel columns, the lower ends of the steel columns are connected with cable ropes, and the control direction is in place.
6. The construction method of a newly built plate above a rail-mounted area of an existing subway station according to claim 5, wherein in the process of hoisting steel columns, two 90-degree theodolites are used for detecting the verticality of the steel columns, then the steel beams are installed in place, and after the steel beams are connected with the existing beam structure through high-strength bolts, the verticality and the levelness are checked by the theodolites until no errors exist.
7. The method for constructing a newly built slab above a rail-mounted area of an existing subway station according to claim 1, wherein the steel beam is an H-shaped steel beam.
8. The method of constructing a new slab above the rail-mounted area of an existing subway station according to claim 1, wherein after the steel pad, the steel joist and the steel platform bottom die are removed, stone is dry-hung outside the steel column to restore the decorative surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210161519.2A CN114458042B (en) | 2022-02-22 | 2022-02-22 | Construction method for newly-built plate above rail-mounted area of existing subway station |
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| CN202210161519.2A CN114458042B (en) | 2022-02-22 | 2022-02-22 | Construction method for newly-built plate above rail-mounted area of existing subway station |
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