CN112727132A - Method for dismantling existing canopy of overhead operation subway station - Google Patents
Method for dismantling existing canopy of overhead operation subway station Download PDFInfo
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- CN112727132A CN112727132A CN202011436134.XA CN202011436134A CN112727132A CN 112727132 A CN112727132 A CN 112727132A CN 202011436134 A CN202011436134 A CN 202011436134A CN 112727132 A CN112727132 A CN 112727132A
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- 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
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Abstract
The invention discloses a method for dismantling an existing canopy of an overhead operation subway station, wherein the method comprises the following steps: s1, building extension platforms on two sides of the outer edge rail running area of the overhead operation subway; s2, building a door type truss car unit group outside the extension platform, hoisting the door type truss car unit group to the extension platform, and moving the door type truss car unit group to a position above an existing canopy along the extension platform; s3, splitting the existing canopy into canopy unit blocks; and S4, sequentially hoisting the rain shed unit blocks by using the door type truss vehicle unit groups, walking to the end part of the extension platform, hoisting the door type truss vehicle unit groups to the ground integrally, and disassembling. The invention can realize the quick dismantling of the existing canopy of the station under the condition of ensuring the normal operation of the subway station, shorten the construction period and reduce the construction cost.
Description
Technical Field
The invention relates to a method for dismantling an existing canopy of an overhead operation subway station, and belongs to the technical field of overhead operation subway transformation.
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 located in the central urban area is basically arranged in the 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.
The elevated multi-layer island type station is a station structure of an elevated operation subway station, the main structure of the elevated multi-layer island type station comprises a foundation column, a subway platform and a canopy, wherein the subway platform is arranged on the foundation column, the canopy is arched and is erected on the subway platform, a platform is arranged at the middle part of the subway platform, subway rails are arranged on two sides of the platform, and passengers are driven by the subways passing in and out of the platform.
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 reconstruction of the existing elevated operation subway station, 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 quick removal of the existing canopy under the condition of ensuring the normal operation of the subway station is achieved, and at present, almost no borrowable technical means exist.
Disclosure of Invention
Based on the above, the invention provides a method for removing the existing canopy of the overhead operation subway station, which can realize the quick removal of the existing canopy of the station under the condition of ensuring the normal operation of the subway station, shorten the construction period and reduce the construction cost.
The technical scheme of the invention is as follows: a method for dismantling an existing canopy of an overhead operation subway station, wherein the method comprises the following steps:
s1, building extension platforms on two sides of the outer edge rail running area of the overhead operation subway;
s2, building a door type truss car unit group outside the extension platform, hoisting the door type truss car unit group to the extension platform, and moving the door type truss car unit group to a position above an existing canopy along the extension platform;
s3, splitting the existing canopy into canopy unit blocks;
and S4, sequentially hoisting the rain shed unit blocks by using the door type truss vehicle unit groups, walking to the end part of the extension platform, hoisting the door type truss vehicle unit groups to the ground integrally, and disassembling.
In one example, the construction method of the extension supporting platform comprises the following steps: firstly, building an extension supporting platform foundation, and then building columns, beams and panels of the extension supporting platform.
In one example, a running rail is provided on the extension platform, and the door type truss unit group can move along the running rail.
In one example, the door type truss vehicle unit group comprises:
the beam is horizontally arranged;
the upright columns are arranged at two ends of the cross beam, and the top ends of the upright columns are connected with the end parts of the cross beam;
the walking mechanism is arranged at the bottom end of the upright post;
the protective shed is arranged on the cross beam;
the hoisting mechanism is arranged on the cross beam;
the protective shed is used for carrying out top protection on the portal frame truss vehicle.
In one example, the hoisting mechanism comprises:
the hanging rail is arranged on the inner top surface of the portal frame truss vehicle;
the electric hoist is arranged on the hanging rail in a matched mode and used for hanging and moving all the awning unit blocks;
wherein the electric hoist can move along the hanging rail
In one example, before an existing canopy is removed, a lamp bracket support is built on an existing platform, and a movable lighting lamp, a guide mark, weak current system terminal equipment and distribution line pipe equipment thereof are moved to the lamp bracket support from a steel truss of the existing canopy; and then splitting the existing canopy into the canopy unit blocks, and fixing the corresponding positions of the canopy split unit blocks and the door type truss vehicle unit groups.
In one example, the canopy unit blocks are units for manually removing roof tiles and tie bars between existing canopy lifting sections.
In one example, a safety shield is provided at the trackside, the device comprising:
a protection plate in a plate shape;
the top end of the frame is connected with the protection plate;
the wheels are arranged at the bottom end of the frame, and the wheels are arranged at the bottom ends of two sides of the frame;
the wheels on the two sides are respectively matched with the two rails of the rail running area, and the wheels can move along the rails, so that the protection plate can move in the rail running area.
The invention has the beneficial effects that: according to the invention, the extension platforms are built on two sides of the rail outer edge rail running area, the extension platforms are used as the supporting foundation of the portal type truss vehicle unit group, when the existing canopy is dismantled, the portal type truss vehicle unit group can quickly slide the dismantled existing canopy section to the outside of the extension supporting platform in a subsection mode, and integrally hoist the canopy section to the outside of the subway rail for dismantling, so that the dismantling efficiency of the existing canopy is improved. 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.
Drawings
Fig. 1 is a schematic structural diagram 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 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 structural view of a 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;
FIG. 13 is a schematic view of the safety shield apparatus;
FIG. 14 is a schematic view of the safety device installed in the rail area
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 cross beams, 22 upright columns, 23 traveling mechanisms, 24 protective sheds, 25 hoisting mechanisms, 26 supporting jig frames and 27 oblique 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, a landscape platform;
70 guard
71 protective plates, 72 frames, 73 wheels and 74 limiting mechanisms;
741 limit rod, 742 limit roller.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with 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. 2 to 7, a method for removing an existing canopy of an elevated operating subway station according to an embodiment of the present invention includes:
s1, building extension platforms on two sides of the outer edge rail running area of the overhead operation subway.
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 extension supporting platforms 30 on two sides according to the procedures.
When the side platform 50 needs to be expanded outside the existing platform 121, a section 51 of the side platform can be constructed outside the existing platform 121, and the extension supporting platform 30 is connected with the section 51 of the side platform to form an integral supporting platform, so that the door type truss car unit group 20 can be conveniently hoisted. 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 S2, building a door type truss vehicle unit group 20 outside the extension platform, hanging the door type truss vehicle unit group 20 on the extension platform, and moving the door type truss vehicle unit group 20 to a position above the existing canopy 13 along the extension platform.
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 member 21, and the top ends of the columns 22 are connected to the ends of the cross member 21 to support the cross member 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 plurality of cross beams 21, the upright columns 22 and the traveling mechanism 23 jointly form the portal frame truss vehicle with the preset length, and the protective shed 24 is used for carrying out upward protection on the portal frame truss vehicle. 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 columns 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. An inclined reinforcing plate 27 is connected between the columns 22 and the cross beam 21 to improve the structural strength of the whole truss vehicle. 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 73 of the door type truss car unit 20 presses 15t, which acts on the track base, and is transmitted to the ground through the side platform section 51 and the temporary anti-support column 511. And arranging a steel pipe bracket 630 with 10mm as a counter support column 511, wherein the distance corresponds to the platform cantilever beam.
And S3, splitting the existing canopy 13 into canopy unit blocks.
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; and then, splitting the existing canopy 13 into the canopy splitting unit blocks, such as manually removing roof tiles and connecting rods between the hoisting segments of the existing canopy 13.
And S4, sequentially hoisting the canopy unit blocks by using the door-type truss vehicle unit group 20, walking to the end part of the extension platform, hoisting the door-type truss vehicle unit group 20 to the ground integrally, and disassembling.
Specifically, each canopy split unit block is hoisted and divided by using the door-type truss vehicle unit group 20, specifically, the corresponding positions of each canopy split unit block and the door-type truss vehicle unit group 20 are hoisted and fixed, and finally the canopy split unit block travels to the end of the extension supporting platform 30, and the door-type truss vehicle unit group 20 is hoisted integrally to the ground by using a 400t crawler crane for construction in a dismantling manner. When each segment is hoisted, the hoisting position can be adjusted through the hoisting track 251 and the electric hoist 252.
According to the invention, the extension platforms are built on two sides of the rail outer edge rail running area, the extension platforms are used as the supporting foundation of the portal type truss vehicle unit group 20, when the existing canopy 13 is dismantled, the portal type truss vehicle unit group 20 can quickly slide the dismantled section of the existing canopy 13 to the outside of the extension supporting platform 30 in a subsection mode, and the section is integrally hoisted to the outside of the subway rail 122 for dismantling, so that the dismantling efficiency of the existing canopy 13 is improved. 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.
In addition, in order to protect the rail running section during construction, referring to fig. 13 and 14, a safety guard 70 including a fender 71, a frame 72, and wheels 73 is provided at the rail running section. The protection plate 71 is in a plate shape and mainly plays a role of protecting the rail row area. And a frame 72 for supporting the fender 71, wherein the top end of the frame 72 is connected to the fender 71. The wheels 73 play a role of moving the protection plate 71, the wheels 73 are installed at the bottom end of the frame 72, and the wheels 73, namely two rows of wheels 73, are arranged at the bottom ends of the two sides of the frame 72, the two rows of wheels 73 are respectively matched with the two rails of the rail running area (the wheels 73 are in contact with the surfaces of the rails during work), and the wheels 73 can move along the rails, so that the protection plate 71 can move in the rail running area. In this embodiment, the protection plate 71 may be made of a non-metal material.
Further, the protection device 70 further comprises a limiting mechanism 74, the limiting mechanism 74 comprises a limiting rod 741, and the limiting rod 741 is vertically arranged at a side position of the wheel 73, so that the transverse movement of the protection device 70 is limited between the surfaces of the two rails. Specifically, the limiting mechanism 74 can act as a limit to prevent the device from falling off the rail when it is moved. In general, a certain gap is left between the limiting rod 741 and the side surface of the rail, so as to prevent the contact friction force from obstructing the movement of the protection device 70. The upper end of the stopper rod 741 may be connected to the carriage 72.
Further, the limiting mechanism 74 further includes a limiting roller 742, the limiting roller 742 is sleeved on the limiting rod 741, the limiting roller 742 can rotate relative to the limiting rod 741, rolling friction is formed when the protective device 70 contacts with the side surface of the rail, and moving resistance can be effectively reduced.
Furthermore, the material of limiting roller 742 is insulating material, so that electric shock can be avoided, and the safety of the device is improved.
Further, the two limiting rods 741 are disposed between the wheels 73 on two sides. Specifically, a limiting rod 741 is disposed inside each wheel 73, and the limiting rod 741 is close to the inside of the rail to prevent the wheel 73 from being separated from the rail. It should be noted that the restraining bar 741 may also be disposed outboard of the side wheels 73, i.e., adjacent the outboard side of the rail.
Further, both sides of the guard plate 71 extend to the platform surface. Specifically, both side surfaces of the protection plate 71 extend to the upper surface of the platform, so that the protection plate 71 can protect the construction safety of the rail running area as much as possible, and the protection effect is better than that of the case where the protection plate 71 is located in the rail running area.
Furthermore, the wheels 73 are insulating rubber wheels, so that electric shock can be avoided, and the safety of the device is improved. In this embodiment, the material of the wheel 73 may be resin or insulating glue. In this embodiment, the wheels 73 may also have a braking function to facilitate fixing at any time. Of course, for better fixation, a stop wedge may be installed on the wheel 73 side after the device is moved into position.
The use method of the protection device 70 comprises the following steps: when the skylight point is constructed, the protective device 70 is arranged on the rail running area, and the wheels 73 are in contact with the surface of the rail, so that the rail running area at the construction position can be effectively protected. When the construction site is moved, the protection can be performed by moving the protection device 70 to the corresponding position.
The advantages of the above-described guard 70 are: this protector 70 includes guard plate 71, frame 72 and wheel 73, and when constructing above subway station rail row district, can place this protector 70 on the rail of subway to make wheel 73 be located on the rail, this protector 70 can protect the rail row district not influenced by the construction this moment, can adjust its guard position according to the construction position again. The protection device 70 has the advantages of simple structure, convenience in operation, strong practicability and the like, and is particularly suitable for protecting the rail row area from being influenced during construction.
Example 2:
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.
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 overhead operation subway station 10, the available technical means are very limited, and especially for the extension and reconstruction of the overhead multi-layer island 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 14, a construction method for rebuilding and expanding a main building structure of an existing elevated subway station 10 according to an embodiment of the present invention includes:
and S1, constructing 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.
S2, constructing a side platform segment 51 on the landscape platform 60, and the side platform segment 51 extending to a predetermined distance outside the existing rain shed 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 overhead 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 truss car unit group 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 the 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 member 21, and the top ends of the columns 22 are connected to the ends of the cross member 21 to support the cross member 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 plurality of cross beams 21, the upright columns 22 and the traveling mechanism 23 jointly form the portal frame truss vehicle with the preset length, and the protective shed 24 is used for carrying out upward protection on the portal frame truss vehicle. 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 columns 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 shed 24, and the support jig 26 is used to support a new rain shed 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 73 of the door type truss car unit 20 presses 15t, which acts on the track base, and is transmitted to the ground through the side platform section 51 and the temporary anti-support column 511. And arranging a steel pipe bracket 630 with 10mm as a counter support column 511, wherein the distance corresponds to the platform cantilever beam.
And S5, hanging the new canopy assembly unit blocks on 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 new 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 to be split integrally.
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.
S7, completing the construction of the side platform second section 52, wherein the side platform second section 52 is located inside one end of the side platform 50, and the side platform second section 52 extends to a predetermined distance close to the subway rails 122, and the side platform second section 52 and the side platform first section 51 together form the side 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 precast member 521 is a precast concrete plate, and is composed of a mesh reinforcement 5211, galvanized rectangular pipes 5212, concrete 5213, embedded hanging rings 5214, and the like, wherein the galvanized rectangular pipes 5212 are disposed on two sides of the precast concrete plate, i.e., the two sides close to and away from the subway rail 122, the galvanized rectangular pipes 5212 are welded to the mesh reinforcement 5211, the mesh reinforcement 5211 is exposed at two ends of the precast concrete plate, i.e., the mesh reinforcement 5211 is disposed at the front end and the rear end along the length direction of the subway rail 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 sections 51, the reinforcing mesh 5211 on the precast concrete plates is bound and overlapped with the studs 5221, and finally concrete 5213 and C40 are poured between the precast concrete plates, namely the transverse middle parts of the cantilever steel beams 522 and are slightly expanded.
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 as follows: then 5.6 × 2.4 × 0.2 × 2.5 × 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: firstly, 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 construction is performed successively, so that the first section 51 of the side platform and the extension supporting platform 30 are used as the foundation of the door type truss car unit group 20 together, and a foundation is laid for rapid construction of a subway expansion main body. Second, door-type truss unit group 20 can regard as interim protection canopy 24, keeps apart newly-built canopy 40 and subway operation district, 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. Thirdly, the door type truss vehicle unit group 20 can rapidly convey all canopy assembly unit blocks of the newly-built canopy 40 to the upper side of the subway platform from the extension supporting platform 30 for assembly, and further the assembly efficiency of the newly-built canopy 40 is improved. Thirdly, the door type truss vehicle unit group 20 can quickly slide the removed section of the existing canopy 13 to the outside of the extension supporting platform 30 in a subsection mode, and integrally lift the section of the existing canopy to the outside of the subway rail 122 for disassembly and fine removal, so that the removal efficiency of the existing canopy 13 is improved. 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, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A method for dismantling an existing canopy of an overhead operation subway station, wherein the method comprises the following steps:
s1, building extension platforms on two sides of the outer edge rail running area of the overhead operation subway;
s2, building a door type truss car unit group (20) outside the extension platform, hoisting the door type truss car unit group (20) to the extension platform, and moving the door type truss car unit group to a position above an existing canopy (13) along the extension platform;
s3, splitting the existing canopy (13) into canopy unit blocks;
and S4, sequentially hoisting the rain shed unit blocks by using the door type truss vehicle unit group (20), walking to the end part of the extension platform, and hoisting the door type truss vehicle unit group (20) to the ground integrally and then disassembling.
2. The construction method according to claim 1, wherein the construction method of the extended support platform (30) is: firstly, a foundation of the extension supporting platform (30) is built, and then columns, beams and panels of the extension supporting platform (30) are built.
3. A construction method according to claim 1, wherein a running rail is provided on the extension platform, and the door-type truss unit group (20) is movable along the running rail.
4. A construction method according to claim 3, wherein the portal truss vehicle unit group (20) comprises: a cross beam (21) arranged horizontally;
the upright columns (22) are arranged at two ends of the cross beam (21), and the top ends of the upright columns (22) are connected with the end parts of the cross beam (21);
a running mechanism (23) arranged at the bottom end of the upright column (22);
a protective shed (24) arranged on the cross beam (21);
the hoisting mechanism (25) is arranged on the cross beam (21);
the plurality of cross beams (21), the upright columns (22) and the traveling mechanism (23) jointly form a portal frame truss vehicle with a preset length, and the protective shed (24) is used for carrying out roof-climbing protection on the portal frame truss vehicle.
5. Construction method according to claim 4, wherein said hoisting means (25) comprise:
a hanging rail (251) disposed on an interior top surface of the portal frame truss vehicle;
the electric hoist (252) is arranged on the hanging rail (251) in a matched mode, and the electric hoist (252) is used for hanging and moving all the awning unit blocks;
wherein the electric hoist (252) is movable along the hanging rail (251).
6. The construction method according to claim 1, wherein before the existing canopy (13) is removed, a lamp bracket support is built on an existing platform (121), and the movable 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 from a steel truss of the existing canopy (13); then, the existing canopy (13) is split into the canopy unit blocks, and the corresponding positions of the canopy split unit blocks and the door type truss vehicle unit group (20) are fixed.
7. A construction method according to claim 6, wherein the canopy blocks are blocks for manually removing roof tiles and tie bars between existing canopy (13) lifting sections.
8. A construction method as claimed in claim 1, wherein a safety guard (70) is provided at the trackbed, said device comprising:
a shield plate (71) having a plate shape;
the top end of the frame (72) is connected with the protection plate (71);
the wheels (73) are arranged at the bottom ends of the frame (72), and the wheels (73) are arranged at the bottom ends of the two sides of the frame (72);
the wheels (73) on the two sides are respectively matched with two rails of a rail running area, and the wheels (73) can move along the rails, so that the protection plate (71) can move in the rail running area.
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