CN112610244B - Prefabricated part for expanding existing elevated operation subway station platform and installation method thereof - Google Patents
Prefabricated part for expanding existing elevated operation subway station platform and installation method thereof Download PDFInfo
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- CN112610244B CN112610244B CN202011440382.1A CN202011440382A CN112610244B CN 112610244 B CN112610244 B CN 112610244B CN 202011440382 A CN202011440382 A CN 202011440382A CN 112610244 B CN112610244 B CN 112610244B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61B—RAILWAY SYSTEMS; EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR
- B61B1/00—General arrangement of stations, platforms, or sidings; Railway networks; Rail vehicle marshalling systems
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D17/00—Caps for supporting mine roofs
- E21D17/01—Caps for supporting mine roofs characterised by the shape of the cap, e.g. of specified cross-section
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
Abstract
The invention discloses a prefabricated part and an installation method for expanding a platform of an existing elevated operation subway station, wherein the existing elevated operation subway station comprises an existing subway platform, an existing canopy and subway rails, the middle part of the subway platform is provided with the existing platform, the subway rails are arranged on two sides of the existing platform, the existing canopy is erected above the existing subway platform, a side type platform is arranged outside the existing subway platform and comprises a first section of the side type platform and a second section of the side type platform, the second section of the side type platform is a prefabricated part, and the prefabricated part is suitable for being fixedly arranged on an end face, close to the subway rails, of the first section of the type platform after the existing canopy is removed, and enables the inner side of the prefabricated part to be a preset distance away from the subway rails. Compared with the prior art, the method has obvious advantages in the aspects of construction period, mechanical configuration, potential safety hazard, quality risk and the like.
Description
Technical Field
The invention relates to a prefabricated part for expanding a station platform of an existing elevated operation subway and an installation method thereof, and belongs to the technical field of reconstruction of the elevated operation subway.
Background
The subway is a rapid, large-traffic and electric power traction rail transit built in cities. The train runs on a totally closed line, the line in the central urban area is basically arranged in an underground tunnel, and the line outside the central urban area is generally arranged on a viaduct or the ground. The subway is an urban rail transit system which covers various underground and overground roadways of urban areas, is special in right of way, high in density and high in traffic volume.
Along with the continuous expansion of subway traffic network, the passenger flow attracted by the subway is increased day by day, a subway line is newly designed beside an original overhead operation subway station, the conditions of transfer by the overhead operation subway station are more and more, the impact of the transfer passenger flow aggravates the influence of insufficient scale of the original overhead operation subway station, and the scale of part of stations needs to be expanded urgently to improve the service level.
Overhead multilayer island formula station is a station structure of overhead operation subway station, and the major structure of overhead multilayer island formula station includes foundation column, subway platform and canopy, and wherein, the subway platform sets up on the foundation column, and the canopy is the arch to set up on the subway platform, be equipped with the platform at the middle part of subway platform, the both sides of platform are equipped with subway rail, the passenger is by the subway of platform business turn over both sides.
The extension of overhead multilayer island formula station is reformed transform, need demolish existing canopy to newly-built two view platforms and two side formula platforms in subway rail's both sides, in order to improve passenger's transfer efficiency, will set up new canopy simultaneously above existing subway platform and the newly-built side formula platform. However, at present, for the transformation of the existing elevated subway station, the available technical means are very limited, and especially when part of steel beams of the newly-built side platform and the existing canopy are overlapped at the installation position, under the conditions of large engineering quantity and short construction period, how to realize the rapid and safe construction is an urgent technical problem.
Disclosure of Invention
Based on the above, the invention provides a prefabricated part for expanding the platform of the existing overhead operation subway station and an installation method thereof.
The technical scheme of the invention is as follows: a prefabricated part for expanding an existing elevated operation subway station platform, the existing elevated operation subway station comprises an existing subway platform, an existing canopy and subway rails, the existing subway platform is arranged in the middle of the existing subway platform, the subway rails are arranged on two sides of the existing platform, the existing canopy is erected above the existing subway platform, wherein,
and a side type platform is arranged outside the existing subway platform and comprises a first side type platform section and a second side type platform section, wherein the second side type platform section comprises a prefabricated part, and the prefabricated part is suitable for being fixedly arranged on the end surface, close to the subway rail side, of the first side type platform section after the existing canopy is removed, and the inner side of the prefabricated part is a preset distance away from the subway rail.
In one example, the side platform section comprises support columns, a steel beam frame and a concrete layer, the steel beam frame is arranged on the support columns, the concrete layer is poured on the upper end faces of the steel beam frame, one side of the steel beam frame, far away from the existing canopy, is a complete steel beam, and one side of the steel beam frame, close to the existing canopy, is an incomplete partial steel beam.
In one example, an overhanging steel beam is fixedly arranged on the inner side of the incomplete part of the steel beam, and the overhanging steel beam and the incomplete part of the steel beam jointly form the complete steel beam.
In one example, the precast element is a precast concrete panel.
In one example, the precast concrete panel includes a mesh reinforcement and concrete, the mesh reinforcement is formed in the concrete, and the mesh reinforcement is exposed at front and rear ends of the precast concrete panel.
In one example, the cantilever steel beam is welded with a stud, the front end and the rear end of the precast concrete plate are erected on the cantilever steel beam, the reinforcing mesh is bound and overlapped with the stud, and concrete is poured between the adjacent precast concrete plates after being overlapped, so that the adjacent precast concrete plates form a whole.
In one example, galvanized rectangular pipes are arranged on two sides of the precast concrete plate, and the galvanized rectangular pipes are connected with the reinforcing mesh.
In one example, the precast concrete plate is provided with an embedded hanging ring.
The invention also provides a method for installing the prefabricated part, wherein the method comprises the following steps:
s1, firstly, building a section of side type platform outside the existing subway platform;
and S2, fixing a side type platform second section on the side type platform first section, wherein the side type platform second section is a prefabricated part, the prefabricated part is suitable for being fixed on the end face, close to the subway rail side, of the side type platform first section after the existing canopy is removed, the inner side of the prefabricated part is enabled to be away from the subway rail by a preset distance, and the side type platform second section and the side type platform first section form the side type platform together.
The invention has the beneficial effects that: aiming at the special condition that part of steel beams of the newly-built side type platform and the existing canopy are constructed in an overlapping mode on the installation position, the extension construction of the side type platform is divided into two stages, namely, a first stage of the side type platform is constructed, and a second stage of the side type platform is constructed after the existing canopy is dismantled. Because the two sections of the side type platform adopt the prefabricated component structure, compared with the integral construction (such as the mode of firstly dismantling the existing canopy and then pouring the side type platform together) in the aspect of construction, the construction method has obvious advantages in construction period, mechanical configuration, potential safety hazard, quality risk and the like, can effectively shorten the construction period, reduce the construction cost and simultaneously reduce the potential safety hazard.
Drawings
Fig. 1 is a schematic structural view of an existing overhead operation subway station;
FIG. 2 is an elevation view of a door type truss car unit group on an existing elevated operation subway station;
FIG. 3 is a side view of a portal type truss car unit group on an existing elevated operation subway station;
FIG. 4 is a cross-sectional view of a landscape layer after transformation of an existing elevated operation subway station;
FIG. 5 is a schematic plan view of a newly-built canopy;
FIG. 6 is an elevation view of a door truss car unit;
FIG. 7 is a side view of a door truss car unit;
FIG. 8 is a schematic view of the side station;
FIG. 9 is a plan view of a prefabricated component;
FIG. 10 is a sectional view taken along line 1-1 of FIG. 9;
FIG. 11 is a cross-sectional view taken along line 2-2 of FIG. 9;
FIG. 12 is a schematic view of the connection of two prefabricated units;
description of reference numerals:
10 existing elevated operation subway station
11 existing foundation columns, 12 existing subway platforms and 13 existing rainsheds;
121 existing platform, 122 subway rail;
20-door type truss vehicle unit group
21 beams, 22 columns, 23 traveling mechanisms, 24 protective sheds, 25 hoisting mechanisms, 26 supporting jig frames and 27 inclined reinforcing plates;
251 a hanging rail, 252 an electric hoist;
30 extending the support platform;
40, building a new canopy;
50 side type platform
A first 51-side platform section and a second 52-side platform section;
511 support columns, 512 steel girder frames and 513 concrete layers;
521 prefabricated parts, 522 cantilever steel beams;
5211 reinforcing mesh, 5212 galvanized rectangular pipes, 5213 concrete, 5214 embedded hanging rings and 5221 studs;
60 landscape platform.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example 1:
referring to fig. 1, an existing elevated operation subway station 10 includes an existing foundation column 11, an existing subway platform 12 and an existing canopy 13, wherein the existing subway platform 12 is disposed on the existing foundation column 11, the existing canopy 13 is arched and is erected on the existing subway platform 12, an existing platform 121 is disposed in the middle of the existing subway platform 12, subway rails 122 are disposed on both sides of the existing platform 121, and passengers enter and exit subways on both sides from the existing platform 121 during operation.
Referring to fig. 8 to 12, a prefabricated part for expanding a platform of an existing elevated subway station according to an embodiment of the present invention is disclosed. The side platform 50 is arranged outside the existing subway platform 12, the side platform 50 comprises a side platform section 51 and a side platform section 52, the side platform section 52 comprises a prefabricated part 521, and the prefabricated part 521 is suitable for being fixedly arranged on the end face, close to the subway rail 122, of the side platform section 51 after the existing canopy 13 is removed, and the inner side of the prefabricated part 521 is a preset distance away from the subway rail 122.
In the embodiment of the present invention, the side type platform section 51 includes a support column 511, a steel beam frame 512 and a concrete layer 513, the steel beam frame 512 is disposed on the support column 511, the concrete layer 513 is poured on the upper end surface of the steel beam frame 512, and one side of the steel beam frame 512 away from the existing canopy 13 is a complete steel beam, and one side of the steel beam frame 512 close to the existing canopy 13 is an incomplete partial steel beam.
In the embodiment of the invention, the cantilever steel beam 522 is fixedly arranged on the inner side of the incomplete part of the steel beam, and the cantilever steel beam 522 and the part of the steel beam jointly form the complete steel beam. The cantilever beam 522 may be welded or bolted to the inboard end of an incomplete section of the beam in the pattern.
In the embodiment of the present invention, the precast member 521 is a precast concrete slab, and includes a mesh reinforcement 5211 and concrete, the mesh reinforcement 5211 is formed in the concrete 5213, and the mesh reinforcement 5211 is exposed at front and rear ends of the precast concrete slab. The studs 5221 are welded on the cantilever steel beam 522, the front end and the rear end of each precast concrete plate are erected on the cantilever steel beam 522, the reinforcing mesh 5211 and the studs 5221 are bound and overlapped, and concrete 5213 is poured between the overlapped adjacent precast concrete plates, so that the adjacent precast concrete plates form a whole.
In the embodiment of the invention, galvanized rectangular pipes 5212 are arranged on two sides of the precast concrete slab, the galvanized rectangular pipes 5212 are connected with reinforcing meshes 5211, and embedded hanging rings 5214 are arranged on the precast concrete slab, wherein the number of the embedded hanging rings 5214 can be 4, so that the precast concrete slab can be conveniently hoisted.
In order to improve the construction efficiency of the side platform second section 52, it is preferable that the side platform second section 52 is a prefabricated part 521, the prefabricated part 521 is fixedly arranged on the inner side of the side platform first section 51, and the inner side of the prefabricated part 521 extends to a predetermined distance outside the subway rail 122.
The embodiment of the invention provides a method for installing the prefabricated part 521, which comprises the following steps:
s1, a section 51 of the side platform is built outside the existing subway platform 12.
Particularly, the tower crane is adopted for installation, the platform circular pipe column is installed firstly, the main frame beam is installed, the middle steel secondary beam is installed, the overhanging steel secondary beam is installed, concrete in the circular pipe column is poured after the installation of the platform circular pipe column and the steel frame beam is completed, the steel bar truss floor support plate is laid, and platform layer concrete is poured.
Through the above construction, the side type platform section 51 is integrally formed into a structure including the support columns 511, the steel girder frames 512 and the concrete layers 513, the steel girder frames 512 are disposed on the support columns 511, the concrete layers 513 are cast on the upper end surfaces of the steel girder frames 512, and the side of the steel girder frames 512 away from the existing canopy 13 is the complete steel girder frame 512 and the side close to the existing canopy 13 is the incomplete part of the steel girder frame 512.
And S2, fixing a side platform section 52 on a side platform section 51, wherein the side platform section 52 is a prefabricated part 521, the prefabricated part 521 is suitable for being fixed on the end surface, close to the subway rail 122, of the side platform section 51 after the existing canopy 13 is removed, the inner side of the prefabricated part 521 is a preset distance away from the subway rail 122, and the side platform section 50 is formed by the side platform section 52 and the side platform section 51 together.
Specifically, the construction method of the second side-type platform section 52 includes bolting or welding the cantilever steel beams 522 to the inner sides of the incomplete partial steel beam frames 512, connecting the cantilever steel beams 522 to the partial steel beam frames 512 to form a complete structure, welding bolts 5221 to the middle of the cantilever steel beams 522 in the transverse direction (along the length direction of the rail) in situ after the cantilever steel beams 522 are installed, hoisting the precast concrete slabs to the two adjacent cantilever steel beams 522 by the embedded hoisting rings 5214, abutting the galvanized rectangular pipes 5212 on the precast concrete slabs to the concrete layer 513 on the first side-type platform section 51, binding and overlapping the mesh steel bars 5211 on the precast concrete slabs with the bolts 5221, and finally pouring concrete between the precast concrete slabs, i.e., the middle of the cantilever steel beams 522 in the transverse direction to slightly expand C40.
In this embodiment, the prefabricated part 521 is a unit cell with a length of 5.6 meters, and is processed in a prefabrication factory in advance, and each plate is provided with 4 reserved hoisting points; after the steel beam is bolted and welded, a welding stud 5221 is additionally arranged at the upper part of the steel beam, a 50t truck crane is used for hoisting and transporting the bedplate of the installation station, and after the plate is positioned, high-grade concrete is poured in a reserved area between the two plates, so that the connection is completed. Wherein each precast concrete plate is 5.6 meters long, 2.4 meters wide and 0.2 meters thick, and each cubic meter is 2.5 tons; the calculation formula is: then 5.6 x 2.4 x 0.2 x 2.5 x =6.72T. The single steel beam is 2.07T.
Aiming at the special condition that part of steel beams of the newly-built side platform 50 and the existing canopy 13 are constructed in an overlapping mode on the installation position, the extension construction of the side platform 50 is divided into two stages, namely, a first stage 51 of the side platform is constructed, and a second stage 52 of the side platform is constructed after the existing canopy 13 is dismantled. Because the side type platform second section 52 adopts the prefabricated part 521 structure, compared with the whole construction, the construction method has obvious advantages in construction period, mechanical configuration, potential safety hazard, quality risk and the like, can effectively shorten the construction period, reduce the construction cost and reduce the potential safety hazard.
Example 2:
in this embodiment, a certain subway station to be expanded is an elevated three-layer island station, the height of a main structure of the station is 21 meters, the width is 17.7m, the length is 120m, the structural form is a concrete frame structure, a canopy is an arc-shaped steel frame structure, the longitudinal distance interval is 6m, and 21 trusses are used in total, in order to meet the transfer between the line and a newly-built line, the existing station needs to be modified, and the modification scheme is as follows: the method comprises the steps of newly building landscape platforms 60 of a plurality of square meters on two sides of a station, newly building platforms on two sides of the station of a plurality of square meters, newly building the area of a steel canopy, dismantling the existing arc-shaped steel canopy of the station, completing electromechanical installation and decoration of newly-built parts, and completing electromechanical installation and decoration and reconstruction of existing station hall layers and station platform layers.
However, at present, for the reconstruction of the existing elevated operation subway station 10, the available technical means are very limited, and especially for the extension and reconstruction of the elevated multi-layer island type station in operation, how to realize the extension and reconstruction of the main structure of the station under the condition of ensuring the normal operation of the subway station hardly exists any borrowable technical means.
Based on this, referring to fig. 2 to 12, a construction method for rebuilding and expanding a main building structure of an existing elevated operation subway station 10 according to an embodiment of the present invention includes:
s1, building landscape platforms 60 on two sides of the existing subway platform 12.
The construction method of the landscape platform 60 is that tower crane installation is adopted, firstly the protective shed 24 of the roadway is built, and then the landscape platform 60 is built. Specifically, the landscape platform 60 is constructed by installing a tower crane, installing the foundation of the roadway protection shed 24 on one side, installing the columns of the roadway protection shed 24, installing the beams and the plates of the roadway protection shed 24, and finally constructing the landscape platform 60 on the roadway protection shed 24.
The design of the landscape platform 60 can enlarge the traffic capacity of the platform, and meanwhile, in order to avoid the influence of construction on the normal passing of the lanes below the existing subway platform 12, a protective shed 24 needs to be arranged above the lanes. In this embodiment, the height of the landscape platform 60 is higher than the normal passing height of the lane and lower than the height of the existing subway platform 12, and a stair or an elevator can be built between the ground and the landscape platform 60 as required to meet the passing requirement of passengers.
And S2, building a side type platform section 51 on the landscape platform 60, wherein the side type platform section 51 extends to a preset distance outside the existing canopy 13.
The construction method comprises the steps of firstly building a section 51 of the side type platform on the landscape platform 60 according to requirements, wherein the section 51 of the side type platform is constructed by adopting a tower crane for installation, firstly installing a platform tubular column, then installing a main frame beam, installing a middle secondary steel beam, installing an overhanging secondary steel beam, pouring concrete in the tubular column after the platform tubular column and the steel frame beam are installed, laying a steel bar truss floor support plate, and pouring platform layer concrete.
Through the above construction, the side type platform section 51 is integrally formed into a structure including the support columns 511, the steel girder frames 512 and the concrete layers 513, the steel girder frames 512 are disposed on the support columns 511, the concrete layers 513 are cast on the upper end surfaces of the steel girder frames 512, and the side of the steel girder frames 512 away from the existing canopy 13 is the complete steel girder frame 512 and the side close to the existing canopy 13 is the incomplete part of the steel girder frame 512.
The side platform section 51 is a part of the station platform, and a stair or an elevator can be built between the side platform section 51 and the landscape platform 60 according to the requirement so as to meet the passing requirement of passengers. It should be noted that in the present embodiment, the side platform section 51 extends to a predetermined distance outside the existing canopy 13, and the predetermined distance is suitable for the side platform section 51 to support the door type truss unit group 20.
And S3, building an extension supporting platform 30 outside the existing elevated operation subway along the subway rail 122 direction, and connecting the extension supporting platform 30 with the side type platform section 51.
The construction method of the extension supporting platform 30 comprises the following steps: firstly, building a foundation for the extension supporting platform 30, then building columns, beams and panels of the extension supporting platform 30, and completing construction of the four extension supporting platforms 30 according to the procedures.
The purpose of the extended support platform 30 is to connect to a section 51 of the side platform to form an integral support platform for the lifting of the portal girder unit set 20. Preferably, running rails are provided on the extension support platform 30 and the side platform section 51, and the door type truss unit group 20 can move along the running rails.
And S4, building a portal truss vehicle unit group 20 outside the extension platform, and hoisting the portal truss vehicle unit group 20 to the extension support platform 30.
The door type truss vehicle unit group 20 comprises a cross beam 21, a vertical column 22, a traveling mechanism 23, a protective shed 24 and a hoisting mechanism 25. A number of cross beams 21 are arranged horizontally to form a roof structure. A plurality of columns 22 are installed at both ends of the cross beam 21, and the top ends of the columns 22 are connected to the ends of the cross beam 21 to support the cross beam 21. The running mechanism 23 is installed at the bottom end of the upright column 22, and the running mechanism 23 is used for driving the truss to move integrally. The shelter 24 is mounted on the beam 21. The hoisting mechanism 25 is mounted on the inner top surface of the portal frame truss. Through the structure, the door type frame truss car with the preset length is formed by the plurality of cross beams 21, the upright posts 22 and the traveling mechanism 23, and the protection shed 24 is used for carrying out top protection on the door type frame truss car. The running gear 23 can be a running carriage of a conventional girder vehicle.
In the door type truss car unit group 20, the hoisting mechanism 25 comprises a hoisting track 251 and an electric hoist 252, wherein the hoisting track 251 is arranged on the inner top surface of the door type frame truss car; the electric hoist 252 is installed on the hanging rail 251 in a matching manner, the electric hoist 252 can move along the hanging rail 251, and the electric hoist 252 is used for hanging and moving old canopy dismantling unit blocks. In one example, two hanging rails 251 are provided, which are respectively disposed on both sides of the inner top of the portal frame girder vehicle and are disposed along the length direction of the portal frame girder vehicle.
In the portal type truss vehicle unit group 20, the distance between the upright posts 22 at two sides is greater than the distance between the edges at two sides of the subway rail 122, and the height of the portal type frame truss vehicle is greater than that of the existing canopy 13. It should be noted that the transverse distance of the portal frame truss should be slightly less than the distance between the sides of the newly created rainshed 40 and the height should be slightly less than the height of the newly created rainshed 40. In one example, the main structure of the station of the existing elevated operation subway station 10 has a height of 21 meters, a width of 17.7m, a length of 120m, and a single width of 21m, a length of 12m, and a height of 8.2m for the portal frame truss.
In the door type truss unit 20, an oblique reinforcing plate 27 is connected between the upright column 22 and the cross beam 21 to improve the structural strength of the whole truss. A support jig 26 is provided on the upper top surface of the protection canopy 24, the support jig 26 being used to support a new canopy assembly unit block. The side at portal frame purlin car also is equipped with protection canopy 24, and side and top surface all have protection canopy 24 about so purlin car, can make portal frame purlin car form a relatively confined whole, and then improve the protective effect.
It should be noted that since the door truss unit 20 is eccentrically pressed on the side platform section 51, a "counter bracing" measure is added to ensure the structural safety. The specific setting method comprises the following steps: in this embodiment, the wheel pressure 15t of the door type truss car unit set 20 acts on the track base and is transmitted to the ground through the side platform section 51 and the temporary anti-support column 511. The steel tube supports 630 × 10mm are arranged to serve as the anti-support columns 511, and the spacing corresponds to the platform cantilever.
And S5, hanging the new canopy assembly unit blocks onto the door-type truss vehicle unit group 20, moving the door-type truss vehicle unit group 20 to a preset position, and assembling the canopy assembly unit blocks to form a newly-built canopy 40.
And (3) hanging the new canopy assembly unit blocks to the door-type truss vehicle unit group 20, moving the door-type truss vehicle unit group 20 to a preset position, and assembling all the canopy assembly unit blocks to form a new canopy 40. It should be noted that the aforementioned canopy assembly unit block refers to a plurality of unit blocks into which a new canopy is divided, each unit block is disposed on one of the portal truss vehicle unit groups 20, and the canopy assembly unit blocks above the subway rail 122 are sequentially slid section by the plurality of portal truss vehicle unit groups 20 to a predetermined position for assembly.
When assembling the new canopy 40, the door type truss car unit group 20 can be used as a temporary protection shed 24 to isolate the new canopy 40 from the subway operation area, thereby ensuring the safety of construction and ensuring the normal operation of the subway. In addition, the door type truss unit group 20 can rapidly transport each canopy assembly unit block of the newly-built canopy 40 to the upper side of the subway platform for assembly, thereby improving the assembly efficiency of the newly-built canopy 40.
In addition, when hoisting each canopy assembly unit block, can place each canopy assembly unit block on the support bed-jig 26 on protection canopy 24, through adjusting each position and the height of supporting the bed-jig 26, so that each canopy assembly unit block is put into the position of assembling in advance, in order to improve the packaging efficiency of new canopy.
And S6, splitting the existing canopy 13 into canopy split unit blocks, hoisting and sliding the canopy split unit blocks to the extension supporting platform 30 by the door type truss vehicle unit group 20, and hoisting the canopy split unit blocks to the outside of the extension supporting platform 30 integrally to be split.
Before the existing canopy 13 is removed, a lamp bracket support is firstly built on the existing platform 121, and the dynamic lighting lamp, the guide mark, the weak current system terminal equipment and the distribution line pipe equipment thereof are moved to the lamp bracket support by a steel truss of the existing canopy 13; then, the existing canopy 13 is split into the canopy splitting unit blocks, for example, roof tiles and connection rods between the hoisting sections of the existing canopy 13 are manually removed, then the door-type truss vehicle unit groups 20 are used for hoisting and fixing the sections, specifically, the canopy splitting unit blocks are hoisted and fixed at corresponding positions of the door-type truss vehicle unit groups 20, finally, the canopy splitting unit blocks are moved to the extending support platform 30, and the door-type truss vehicle unit groups 20 are integrally hoisted to the ground by using a 400t crawler crane for construction in a split mode. Specifically, when each segment is hoisted, the hoisting position can be adjusted through the hoisting track 251 and the electric hoist 252.
And S7, completing the construction of a side type platform second section 52, wherein the side type platform second section 52 is positioned at the inner side of one end of the side type platform 50, the side type platform second section 52 extends to a preset distance close to the subway rails 122, and the side type platform second section 52 and the side type platform first section 51 jointly form the side type platform 50.
In order to improve the construction efficiency of the side platform section 52, it is preferable that the side platform section 52 is a prefabricated part 521, and the prefabricated part 521 is fixedly arranged on the inner side of the side platform section 51, and the inner side of the prefabricated part 521 extends to a predetermined distance outside the subway rail 122.
Specifically, the construction method of the side-type platform second section 52 includes bolting or welding the cantilever beams 522 to the inner sides of the incomplete part of the steel beam frame 512, connecting the cantilever beams 522 and the part of the steel beam frame 512 to form a complete structure of the steel beam frame 512, and then sequentially hoisting the prefabricated members 521 between two adjacent cantilever beams 522 and connecting the two cantilever beams 522 to form the complete side-type platform second section 52.
In this embodiment, the prefabricated member 521 is a precast concrete plate, and is composed of a steel bar net 5211, a galvanized rectangular pipe 5212, concrete 5213, and embedded hanging rings 5214, etc., wherein two sides of the precast concrete plate, i.e., the sides close to and away from the subway line 122, are the galvanized rectangular pipes 5212, the galvanized rectangular pipes 5212 are welded to the steel bar net 5211, the steel bar net 5211 is exposed at two ends of the precast concrete plate, i.e., the steel bar net 5211 is provided at the front and rear ends along the length direction of the subway line 122, the embedded hanging rings 5214 are embedded in the precast concrete plate, and the number of the embedded hanging rings 5214 may be 4. During construction, after the cantilever steel beams 522 are installed, the studs 5221 are welded on the middle parts of the cantilever steel beams 522 in the transverse direction (along the length direction of the rail) on site, then the precast concrete plates are hung and moved to the two adjacent cantilever steel beams 522 through the embedded hanging rings 5214, the galvanized rectangular pipes 5212 on the precast concrete plates are abutted to the concrete layers 513 on the side type platform section 51, the reinforcing mesh 5211 on the precast concrete plates is bound and overlapped with the studs 5221, and finally concrete 5213 is poured between the precast concrete plates, namely the transverse middle parts of the cantilever steel beams 522, and C40 micro-expansion is achieved.
In this embodiment, the prefabricated component 521 has a length of 5.6 meters as a cell, and is processed in advance in a prefabrication factory, and each plate is provided with 4 reserved hoisting points; after the steel beam is bolted and welded, a welding stud 5221 is additionally arranged at the upper part of the steel beam, a 50t truck crane is used for hoisting and transporting the bedplate of the installation station, and after the plate is positioned, high-grade concrete is poured in a reserved area between the two plates, so that the connection is completed. Wherein each precast concrete plate is 5.6 meters long, 2.4 meters wide and 0.2 meters thick, and each cubic meter is 2.5 tons; the calculation formula is as follows: then 5.6 x 2.4 x 0.2 x 2.5 x =6.72T. The single steel beam is 2.07T.
Compared with the prior art, the construction method for rebuilding and expanding the main building structure of the existing elevated operation subway station 10 has the following advantages: 1. the side platform 50 is divided into a first section 51 of the side platform and a second section 52 of the side platform and constructed successively, so that the first section 51 of the side platform and the extension supporting platform 30 are jointly used as the foundation of the door type truss car unit group 20, and a foundation is laid for the rapid construction of the subway expansion main body. 2. Gate-type purlin car unit group 20 can keep apart newly-built canopy 40 and subway operation district as interim protection canopy 24, and then guarantees the security of construction, can guarantee simultaneously that the newly-built construction of canopy can not influence the normal operation of subway. 3. The portal truss vehicle unit group 20 can rapidly transport all canopy assembly unit blocks of the newly-built canopy 40 from the extension supporting platform 30 to the position above the subway platform for assembly, and therefore the assembly efficiency of the newly-built canopy 40 is improved. 3. The portal type truss vehicle unit group 20 can quickly slide the removed existing canopy 13 section to the outside of the extension supporting platform 30 in a subsection mode, and integrally lift the existing canopy 13 section to the outside of the subway rail 122 for disassembly and fine removal, and therefore the removing efficiency of the existing canopy 13 is improved. 5. The invention can carry out construction under the condition of ensuring the normal operation of the subway, and has the advantages of less construction difficulty, shortened construction period, saved construction cost and the like.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. The utility model provides an installation method for extending prefabricated component of existing overhead operation subway station platform, existing overhead operation subway station (10) are including existing subway platform (12), existing canopy (13) and subway rail (122), the middle part of existing subway platform (12) is equipped with existing platform (121), the both sides of existing platform (121) are equipped with subway rail (122), existing canopy (13) are set up in existing subway platform (12) top, the installation method includes:
s1, firstly, building a side type platform section (51) outside the existing subway platform (12);
s2, fixing a side type platform section (52) on the side type platform section (51), wherein the side type platform section (52) comprises a prefabricated part (521), the prefabricated part (521) is suitable for being fixed on the end face, close to the subway rail (122), of the side type platform section (51) after the existing canopy (13) is removed, the inner side of the prefabricated part (521) is enabled to be a preset distance away from the subway rail (122), and the side type platform (50) is formed by the side type platform section (52) and the side type platform section (51);
the method for dismantling the existing canopy comprises the following steps: the side type platform section (51) extends to a preset distance outside the existing canopy (13), an extension supporting platform (30) is built outside the existing elevated operation subway along the direction of a subway rail (122), the extension supporting platform (30) is connected with the side type platform section (51), a door type truss vehicle unit group (20) is built outside the extension supporting platform (30), the door type truss vehicle unit group (20) is hung on the extension supporting platform (30), the existing canopy (13) is split into canopy split unit blocks, the canopy split unit blocks are hoisted and slid to the extension supporting platform (30) by the door type truss vehicle unit group (20), and then the canopy split unit blocks are hoisted to the outside of the extension supporting platform (30) integrally;
portal-type truss car unit group (20) are including crossbeam (21), stand (22), walk capable mechanism (23), protection canopy (24) and hoisting machine construct (25), a plurality of crossbeam (21) levels are arranged and are formed the roof structure, the both ends at crossbeam (21) are installed in a plurality of stand (22), and the top of stand (22) links to each other with the tip of crossbeam (21), with supporting beam (21), walk capable mechanism (23) and install the bottom in stand (22), it is used for driving the moving as a whole of truss car to walk capable mechanism (23), protection canopy (24) is installed on crossbeam (21), hoisting machine constructs (25) and installs on portal-type frame truss car's interior top surface.
2. The prefabricated part installation method according to claim 1, wherein the side platform section (51) comprises a support column (511), a steel beam frame (512) and a concrete layer (513), the steel beam frame (512) is disposed on the support column (511), the concrete layer (513) is cast on an upper end surface of the steel beam frame (512), and a side of the steel beam frame (512) remote from the existing canopy (13) is a complete steel beam and a side close to the existing canopy (13) is a partial steel beam.
3. The method of installing the prefabricated parts according to claim 2, wherein an overhanging steel beam (522) is fixedly arranged at the inner side of the incomplete part of the steel beam, and the overhanging steel beam (522) and the part of the steel beam together form the complete steel beam.
4. The method of installing prefabricated parts according to claim 3, wherein said prefabricated parts (521) are precast concrete plates.
5. The prefabricated unit installation method of claim 4, wherein the precast concrete plate comprises a mesh reinforcement (5211) and concrete (5213), the mesh reinforcement (5211) is formed in the concrete (5213), and the mesh reinforcement (5211) is exposed at both front and rear ends of the precast concrete plate.
6. The method of installing prefabricated parts according to claim 5, wherein studs (5221) are welded to the cantilever beams (522), the precast concrete panels are erected on the cantilever beams (522) at front and rear ends thereof, the reinforcing mesh (5211) is bound and overlapped with the studs (5221), and concrete (5213) is poured between the adjacent overlapped precast concrete panels so that the adjacent precast concrete panels form a whole.
7. The prefabricated unit installation method of claim 5, wherein galvanized rectangular pipes (5212) are provided on both sides of the precast concrete slab, and the galvanized rectangular pipes (5212) are connected with the mesh reinforcement (5211).
8. The prefabricated part installation method according to claim 5, wherein hanging rings (5214) are embedded on the precast concrete panel.
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