CN114458042A - Construction method for newly building plate above existing subway station rail-mounted area - Google Patents
Construction method for newly building plate above existing subway station rail-mounted area Download PDFInfo
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- CN114458042A CN114458042A CN202210161519.2A CN202210161519A CN114458042A CN 114458042 A CN114458042 A CN 114458042A CN 202210161519 A CN202210161519 A CN 202210161519A CN 114458042 A CN114458042 A CN 114458042A
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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 running area of an existing subway station, which comprises the following steps: removing a decorative surface layer of a side wall of a rail running area of an existing subway station; drilling and installing a first bracket at the newly-built plate elevation position on the exposed side wall structure surface; chiseling a station bedplate where a column structure is located in the range of the newly-built plate, welding a steel column through embedded bars of a beam where column feet are located, and welding a second bracket at the elevation of the newly-built plate of the steel column; during the outage of the rail transport area of the existing subway station, steel beams are installed on the first bracket and the second bracket; 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 suspension rods are arranged on a steel beam in a back-off manner, the lower ends of the U-shaped suspension rods are connected through a steel base plate, and the steel keel and the steel platform bottom die are sequentially arranged on the steel base plate from bottom to top; binding newly-built plate steel bars and beam steel bars above the bottom die of the steel platform, and pouring steel platform concrete; and (5) removing the steel base plate, the profile steel keel and the steel platform bottom die. The new building board 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 construction engineering, in particular to a construction method for newly building a plate above a rail running area of an existing subway station.
Background
Along with the continuous development of cities, the subway line network gradually increases the encryption lines from the original backbone lines, and then forms a looped network, so that a radial net shape, a radial ring shape, a chessboard radial shape and the like are formed in the whole city. Through the subway of the four-way and eight-reach, people can arrive at any corner of a 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 environment and cannot expand to the external space, the old line station needs to be reformed, a new line transfer channel is communicated with an existing station hall plate, a station hall plate is newly built above a rail traffic area, a hole is formed in a side wall after the new station hall plate is completed, passengers enter the new station hall plate from the new line transfer channel, the old line station waiting vehicle is entered through a step to realize the transfer function, the new station hall plate is newly built above the rail traffic area under the condition that how to ensure that a subway train does not stop running, and the problem needing to be solved is to ensure the operation safety in the construction process of the station hall plate.
In order to ensure that a new slab is constructed above a lower rail running area without stopping a train, under the condition of traffic, the existing construction technology is to implant steel bars into concrete cylinders in the middle of a side wall and a station as anchor bars for connecting steel corbels for a newly added station hall layer, the steel beams are connected with the steel corbels through high-strength bolts to form a bidirectional steel frame, the span of a floor slab is reduced through newly added secondary beams with one ends connected with the steel corbels on the side wall and the other ends connected with the steel frame beams, and the floor slab is realized in the mode of pouring concrete on a profiled steel plate or a steel bar truss floor bearing plate. The steel structure surface is protected by spraying concrete not less than 50 a thick. The adoption of the structural form has the characteristics of no formwork erection, small dismantling and reinforcing amount, high construction speed and the like on the premise of ensuring the uninterrupted safe operation of the existing subway line. However, after the construction is completed by the method, the profiled steel sheet is exposed out of the surface of the gap, so that the fire resistance is poor, and the fire-proof requirement of the existing operation company cannot be met.
Therefore, it is necessary and urgent to find a construction method for newly building a station hall plate above a rail road area, which can be quickly constructed and has good fire resistance, to optimize and improve the defects of the prior art and ensure the safe operation of the subway.
Disclosure of Invention
In order to solve the problems mentioned in the prior art, the invention provides a construction method for newly building a plate above a rail running area of an existing subway station, and the construction method has the advantages of firmness, durability and good fireproof performance.
The technical scheme is as follows: a construction method for newly building a plate above a rail running area of an existing subway station comprises the following steps:
removing the decorative surface layer of the side wall of the existing subway station rail-mounted area to expose the surface of the side wall structure;
planting a rib at the elevation of the newly-built plate, drilling and installing an anchor bolt, and installing a first bracket, wherein the first bracket is vertical to the surface of the side wall structure;
chiseling a station bedplate where a column structure is located in the range of the newly-built plate, welding a steel column on a beam planting bar mounting base where a column base is located, and welding a second bracket on the steel column corresponding to the elevation of the newly-built plate, wherein the direction of the second bracket is opposite to that of the adjacent steel column arranged on the inner side of the rail traveling area;
during the outage of the rail running area of the existing subway station, steel beams are installed on the first bracket and the second bracket;
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 suspension rods are arranged on the steel beam in a back-off manner, the lower ends of the U-shaped suspension rods are connected through a steel base plate, and the steel keel and the steel platform bottom die are sequentially arranged on the steel base plate from bottom to top;
binding newly-built plate steel bars and beam ribs above the bottom die of the steel platform, and pouring steel platform concrete;
and (5) removing the steel base plate, the profile steel keel and the steel platform bottom die.
Preferably, in the step of chiseling the station platen where the column structure is located within the range of the newly-built plate, the station platen below the existing column structure and the decorative surface layer of the existing column structure are removed by an electric cutting machine, and the existing beam structure bottom plate and the existing column structure surface are leaked.
Preferably, the steel column is divided into a plurality of sections, and the first section at the bottom is connected with the embedded steel bars of the bottom plate of the existing beam structure by high-strength bolts.
Preferably, the steel columns except for the first section at the bottom are hoisted by using an electric hoist, and the hoisting point is arranged at the upper end 1/3 of each section of the steel column.
Preferably, in the process of hoisting the steel columns, the lower ends of all the sections of steel columns are connected with the guy cables, and the direction is controlled to be in place.
Preferably, in the process of hoisting the steel column, the steel column is subjected to accurate perpendicularity detection by using two 90-degree theodolites, then the steel beam is installed in place, and after the steel beam is connected with the high-strength bolt of the existing beam structure, the perpendicularity and the levelness are rechecked by using the theodolites until the steel column is accurate.
Preferably, the steel beam is an H-shaped steel beam.
Preferably, after the steel backing plate, the steel keel and the steel platform bottom die are removed, the decorative surface is restored by hanging stone outside the steel column in a dry mode.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. the newly built plate structure in the rail traveling area adopts a steel reinforced concrete structure, and the structure made of the steel bars and the concrete ensures that the steel bars bear tension and the concrete bears pressure, so that the newly built plate structure has the advantages of firmness, durability, good fireproof performance, steel saving and low cost compared with the steel structure;
2. the suspension mould construction is used as a reinforcement construction platform and a concrete mould, and normal operation and processing construction progress of a rail running area are ensured under normal operation of a train.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic installation diagram of a first corbel in a construction method of a newly-built slab above a rail-bound region of an existing subway station according to an embodiment of the present invention.
Fig. 2 is a schematic view illustrating installation of a steel column and a second bracket in the construction method of a newly-built slab above a rail traveling area of an existing subway station according to the embodiment of the present invention.
Fig. 3 is a partial schematic view of the beam steel planting bar installation base where the column foot is located in fig. 2 and the first section of the steel column is welded.
Fig. 4 is a partial schematic view of the installation of the second bracket of fig. 2.
Fig. 5 is a top view of fig. 2.
Fig. 6 is a schematic view of installation of steel beams and corbels in the construction method of a newly-built slab above a rail-bound area of an existing subway station provided by the embodiment of the present invention.
Fig. 7 is a schematic view of a steel platform being constructed in the construction method for newly building a slab above a rail road area of an existing subway station according to the embodiment of the present invention.
Fig. 8 is a schematic view of a steel hanging mold applied in the construction method of a newly-built slab above a rail-bound region of an existing subway station provided by the embodiment of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 to 8, an embodiment of the present invention provides a construction method for newly building a slab above a rail passing area of an existing subway station, which mainly includes the following steps:
the first step is as follows: demolish architectural surface and nine-hole brick of existing subway station rail row district side wall, expose the side wall structure surface after, at rail row district side wall new build board elevation department bar planting drilling installation crab-bolt, install first bracket 11, first bracket 11 perpendicular to side wall structure 10 surface, as shown in fig. 1.
The second step is that: chiseling out the platen at the station of new built-up plate within range column structure place, column base place roof beam bar planting installation base 12, welding steel column 13 on the base, correspond new built-up plate elevation and weld second bracket 14 on steel column 13, second bracket 14 direction is the opposite direction and sets up on the adjacent steel column 13 of rail row district inboard, and the elevation of second bracket 14 is unanimous with the elevation of first bracket 11.
Specifically, as shown in fig. 2 to 5, in this step, an electric cutting machine is used to remove a platen below an existing column structure and a decorative surface layer of the existing column structure, a bottom plate of the existing beam structure and a surface of the existing column structure are leaked, the removal size is 1.40m × 1.35m × 0.2m, steel bar planting construction is performed after a base surface is processed, steel bars with a diameter of 25mm are used for steel bar planting, the steel bar planting depth is 700mm, 200 steel columns are used in total, a steel column 13 is a multi-section steel column, and a first section at the bottom is connected with the main beam end plate and the existing beam structure bottom plate through a high-strength bolt (pressure bearing type).
When the steel column is installed in place, the steel column is placed in place, an electric hoist is used for hoisting the H-shaped steel column, when the steel column is hoisted, a hoisting point needs to be located at 1/3 of the upper end of the steel column, and the lower end of the steel column is placed in place by controlling the direction with cable wind. And after the steel column is connected with the main beam high-strength bolt (bearing type), the verticality and the levelness are rechecked by the theodolite until the steel column is error-free.
The third step: during the rail running area of the existing subway station is stopped, for example, after the train is stopped at night, the steel beams 15 are installed on the first bracket 11 and the second bracket 14 and can be H-shaped steel beams, and as shown in fig. 6, the H-shaped steel beams are fully welded with the end plates of the first bracket 11 and the second bracket 14.
The fourth step: constructing a steel hanging die, wherein the steel hanging die comprises two parts, namely a steel keel 16 and a steel platform bottom die 17, a plurality of U-shaped suspension rods 18 are arranged on the steel beam 15 in a back-off manner, the lower ends of the U-shaped suspension rods 18 are connected through a steel base plate 19, and the steel keel 16 and the steel platform bottom die 17 are sequentially arranged on the steel base plate 19 from bottom to top, as shown in fig. 7 and 8. Particularly, the steel platform adopts 25 HN100 shaped steel as template main joist (being the shaped steel fossil fragments), equally divide according to hanger plate span dimension north and south and equally to arranging, the interval is 1200mm, hang on newly-built board's H shaped steel roof beam 15 through customization 25U type jib 18, set up 10 jibs 18 on the every main joist, the interval is 600mm, steel platform die block 17 adopts 10mm steel plate, steel platform die block 17 passes jib 18, installation HN100 shaped steel fossil fragments 16 top is under steel platform die block 17, set up steel backing plate 19 under the shaped steel fossil fragments 16, steel backing plate 19 passes jib 18, jib 18 sets up the nut and fixes steel backing plate 19 and shaped steel fossil fragments 16.
The fifth step: binding newly-built plate steel bars and beam steel bars above the bottom die of the steel platform, and pouring steel platform concrete.
And a sixth step: and (4) removing the steel backing plate, the profile steel keel and the steel platform bottom die, and hanging the stone outside the steel column to restore the decorative surface.
The invention provides a construction method of a newly-built plate above a rail travelling area of an existing subway station, and particularly provides that the newly-built plate structure is of a reinforced concrete structure, an original structure column decoration surface and a plate surface on one side adjacent to the rail travelling area are broken, steel columns are externally coated at beams where the columns are located to be planted to serve as steel columns, brackets are constructed at the elevations of the newly-built plates of the steel columns, anchor bolts are constructed at the elevations of the newly-built plates of the rail travelling area according to anchor bolts, after all construction is completed, the brackets are arranged between the steel columns according to transverse steel beams and steel beams at certain intervals, after the steel beams are installed on the rail travelling area, the steel beams and the steel brackets, a formwork hanging platform is constructed, and after the platform is installed, steel bars are bound to pour concrete.
Compared with the prior art, the invention has the following advantages:
1. the newly built plate structure in the rail traveling area adopts a steel reinforced concrete structure, and the structure made of the steel bars and the concrete ensures that the steel bars bear tension and the concrete bears pressure, so that the newly built plate structure has the advantages of firmness, durability, good fireproof performance, steel saving and low cost compared with the steel structure;
2. the suspension formwork construction is used as a reinforcement construction platform and a concrete mold, and normal operation and processing construction progress of a rail running area are guaranteed under normal operation of a train.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "vertical", "inside", "outside", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The terms "first", "second" and "first" 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 defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The embodiments of the present invention have been described in detail 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 in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (8)
1. A construction method for newly building a plate above a rail running area of an existing subway station is characterized by comprising the following steps:
removing the decorative surface layer of the side wall of the existing subway station rail-mounted area to expose the surface of the side wall structure;
planting a rib at the elevation of the newly-built plate, drilling and installing an anchor bolt, and installing a first bracket, wherein the first bracket is vertical to the surface of the side wall structure;
chiseling a station bedplate where a column structure is located in the range of the newly-built plate, welding a steel column on a beam planting bar mounting base where a column base is located, and welding a second bracket on the steel column corresponding to the elevation of the newly-built plate, wherein the direction of the second bracket is opposite to that of the adjacent steel column arranged on the inner side of the rail traveling area;
during the outage of the rail running area of the existing subway station, steel beams are installed on the first bracket and the second bracket;
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 suspension rods are arranged on the steel beam in a back-off manner, the lower ends of the U-shaped suspension rods are connected through a steel base plate, and the steel keel and the steel platform bottom die are sequentially arranged on the steel base plate from bottom to top;
binding newly-built plate steel bars and beam ribs above the bottom die of the steel platform, and pouring steel platform concrete;
and (5) removing the steel base plate, the profile steel keel and the steel platform bottom die.
2. The method of constructing a new slab over an existing subway station rail road section as claimed in claim 1, wherein in the step of chiseling a station plate where the column structure is located within the range of the new slab, the station plate under the existing column structure and the decorative surface layer of the existing column structure are removed by using an electric cutter, and the existing beam structure bottom plate and the existing column structure surface are leaked out.
3. The method for constructing a newly-built slab above a rail traveling area of an existing subway station as claimed in claim 2, wherein the steel column is divided into a plurality of sections, and the first section at the bottom is connected with the embedded steel bars of the bottom plate of the existing beam structure by high-strength bolts.
4. The method for constructing the newly-built slab above the existing subway station rail-road area as claimed in claim 3, wherein said hoisting of the steel columns except the first section at the bottom by electric hoist is carried out, and the hoisting point is set at the upper end 1/3 of each section of steel column.
5. The construction method for newly building the slab above the rail traveling area of the existing subway station as claimed in claim 4, wherein during the process of hoisting the steel columns, the lower ends of the steel columns are connected with guy cables, and the direction is controlled to be in place.
6. The construction method for newly building the slab above the rail travelling area of the existing subway station as claimed in claim 5, wherein in the process of hoisting the steel column, two theodolites at 90 degrees are used for detecting the verticality of the steel column without errors, then the steel beam is installed in place, and after the steel beam is connected with the high-strength bolt of the existing beam structure, the theodolites are used for rechecking the verticality and the levelness until no errors exist.
7. The construction method for newly building the slab above the track-following area of the existing subway station according to claim 1, wherein said steel beam is an H-shaped steel beam.
8. The method of constructing a new slab above a rail traffic area of an existing subway station as claimed in claim 1, wherein after removing the steel backing plate, the steel joist and the steel platform bottom die, the decorative surface is restored by hanging stone on the outside of the steel column.
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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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