CN114908794A - Assembly type construction method of subway station - Google Patents
Assembly type construction method of subway station Download PDFInfo
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- CN114908794A CN114908794A CN202210379464.2A CN202210379464A CN114908794A CN 114908794 A CN114908794 A CN 114908794A CN 202210379464 A CN202210379464 A CN 202210379464A CN 114908794 A CN114908794 A CN 114908794A
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- E—FIXED CONSTRUCTIONS
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- E—FIXED CONSTRUCTIONS
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- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
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- E02D29/16—Arrangement or construction of joints in foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
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Abstract
An assembly type construction method of a subway station aims to effectively simplify the design of underground structures and construction, accelerate the construction speed and improve the construction quality. The method comprises the following steps: adopting open cut or cover cut construction, and finishing dewatering and drainage, foundation pit excavation, foundation pit enclosure structure and the like according to the implementation sequence; positioning and assembling the prefabricated components of the bottom plate to complete the concrete pouring of the cast-in-place part of the bottom plate; assembling the first side wall block to complete the concrete pouring of the cast-in-place part of the lower side wall; positioning and assembling the middle plate frame prefabricated component to complete the concrete pouring of the cast-in-place part of the middle plate frame; after the middle plate is accurately drilled, the middle plate prefabricated plates are positioned, laid and assembled, and concrete pouring of a cast-in-place part of the middle plate surface is completed; assembling a second side wall block to finish the concrete pouring of the cast-in-place part of the upper side wall; positioning and assembling the prefabricated components of the top plate frame to complete the concrete pouring of the cast-in-place part of the top plate frame; and after the top plate is accurately determined to be provided with the opening, assembling the top plate prefabricated plate and completing concrete pouring of a cast-in-place part of the top plate surface.
Description
Technical Field
The invention belongs to the technical field of tunnel and underground engineering, and particularly relates to an assembly type construction method of a subway station.
Background
The requirements of construction units on the quality and the construction period are increasingly improved. And the traditional subway station adopts a method of open (cover) excavation and full cast-in-place, and has the problems of long construction period, high construction cost, high energy consumption, high construction quality control difficulty and the like.
The underground structure is mainly acted by horizontal load (water and soil pressure), vertical load (dead weight of the middle plate and the inner partition wall, live load and the like) and earthquake, and meets the requirements of civil air defense, water resistance, fire resistance and corrosion resistance. The structure needs to meet strength, stiffness, stability and durability requirements. Traditional underground works use cast-in-place reinforced concrete. The construction links such as binding of reinforcing steel bars, concrete pouring, template building and the like are multiple, the construction period is long, and the difficulty of field quality control is high.
In summary, the existing structure developed in the subway station or underground space still mainly adopts the construction method of the full cast-in-place reinforced concrete. In order to gradually construct an assembly type building in an underground structure represented by a subway, accelerate the construction speed of the underground structure, improve the construction quality, and achieve the purposes of cost saving, energy saving and green construction, it is necessary to carry out deep research on an assembly type construction method of a subway station.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an assembly type construction method of a subway station, so that the underground structure and construction are effectively simplified, the construction speed is increased, and the construction quality is improved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention relates to an assembly type construction method of a subway station, which comprises the following steps:
step 1, constructing the subway station by adopting an open cut or cover cut method, and finishing dewatering and drainage, foundation pit excavation, foundation pit enclosure construction, temporary support erection and waterproof layer construction according to an implementation sequence;
step 2, starting the positioning and assembling of the prefabricated components of the bottom plate according to the designed positioning, and connecting the steel bars in the beam column nodes and the post-cast part of the beam slab of the part to finish the concrete casting of the cast-in-place part of the bottom plate;
step 3, dismantling the support of the foundation pit enclosure structure between the middle plate and the bottom plate, assembling a first side wall block between the middle plate and the bottom plate, connecting the reinforcing steel bars in the post-cast part of the wall plate, and completing the concrete casting of the cast-in-place part of the lower side wall;
step 4, positioning and assembling the middle plate frame prefabricated component, connecting the reinforcing steel bars in the post-cast part of the beam-column joints of the part, completing the concrete casting of the cast-in-place part of the middle plate frame, and realizing the consolidation of the middle plate frame prefabricated component and the column type component in the bottom plate prefabricated component;
step 5, after the middle plate is accurately determined to be perforated, the middle plate prefabricated plates are positioned, laid and assembled, and the laminated plate steel bars on the upper portions of the middle plate prefabricated plates are bound, so that concrete pouring of the cast-in-place portion of the middle plate surface is completed;
step 6, dismantling the support of the foundation pit enclosure structure between the middle plate and the top plate, assembling a second side wall block between the middle plate and the top plate, connecting reinforcing steel bars in the post-cast part of the wall plate, and completing concrete casting of the upper side wall cast-in-place part;
step 7, positioning and assembling the prefabricated components of the top plate frame, connecting the reinforcing steel bars in the post-cast parts of the beam-column joints of the parts, completing the concrete casting of the cast-in-place parts of the top plate frame, and realizing the consolidation of the column type components in the prefabricated components of the top plate frame and the middle plate;
and 8, after the top plate is accurately determined to be provided with the opening, positioning, laying and assembling the top plate prefabricated plate, binding the laminated slab steel bar on the upper part of the top plate prefabricated plate, and finishing the concrete pouring of the cast-in-place part of the top plate surface.
The beneficial effects of the invention are mainly reflected in the following aspects:
firstly, the consumption of concrete and reinforcing steel bars is effectively saved. The sizes of the components of the traditional subway station are determined according to factors such as structural arrangement, stress span of the components and the like. Take the medium plate as an example, generally adopt 400mm in the double column station, generally adopt 500mm in the single column station, and the thickness of no post station board is 600 ~ 700 mm. After the method is adopted, the height of the cast-in-place frame beam is consistent with the thickness of the traditional plate, and the total thickness of the assembled superposed middle plate is generally 200-300 mm. Compared with the traditional method, when the middle plate is an assembled laminated plate, the plate thickness of the post-existing station is reduced by 37.5-50%, and the plate thickness of the post-free station is reduced by 50-64%, so that the method has good technical and economic benefits;
secondly, post-pouring wet joints are adopted for key parts such as beam column joints and wallboard joints, and the prefabrication maximization of the components is realized on the premise of ensuring the overall stress performance. The prefabricated part can adopt high-strength concrete and high-strength steel bars, so that the resource is saved, and the size and the self weight of the prefabricated part are reduced;
the side walls, the middle plate and the top plate outside the frame part can be disassembled, so that the requirements of structural modification of the later stage of the built station and shared interconnection with the surrounding underground space can be met;
fourthly, in the design of a subway station, the middle plate and the top plate hole edge beam with the hole size smaller than 6m can be eliminated, the design is simplified, the investment is saved, and if the equipment area of the underground space adopts the assembly method, the improvement of the middle plate hole in the equipment area caused by the lag of the electromechanical equipment bidding can be reduced;
the working procedures can be flexibly converted, and the method can be used for the whole assembly type construction of all components of a full underground open (covered) excavated subway station, and also can be used for the cast-in-place of a bottom plate and a side wall and the partial assembly type construction of a plate and a top plate in the structure;
sixthly, the design and construction can be simplified, the utilization rate of the assembly type components of the subway station can be improved, the size of the components can be optimized, the construction quality can be improved, the manufacturing cost can be saved, the energy can be saved, and the carbon emission can be reduced. The information management and the standardized design can be realized through a Building Information Model (BIM) technology, and the multi-working-surface mechanized flow construction can be realized.
Drawings
The present specification includes the following 18 figures:
FIG. 1 is a typical floor plan of an assembled subway station floor;
FIG. 2 is a typical floor plan of a slab in an assembled subway station;
FIG. 3 is a typical floor plan of an assembled subway station roof;
FIG. 4 is a cross-sectional view taken along line A-A of FIGS. 1, 2 and 3;
FIG. 5 is a cross-sectional view taken along line B-B of FIGS. 1, 2 and 3;
FIG. 6a is a top view of the bottom rail block DZL 1;
FIG. 6b is a side view of the bottom rail block DZL 1;
FIG. 7a is a top view of a bottom wall beam block DQL 1;
FIG. 7b is a side view of the bottom wall beam block DQL 1;
FIG. 8a is a top view of the center stringer block ZZL 1;
FIG. 8b is a side view of the center stringer block ZZL 1;
FIG. 9a is a top view of the center sill block ZQL 1;
FIG. 9b is a side view of the center sill block ZQL 1;
FIG. 10a is a top view of the top rail piece TZL 1;
FIG. 10b is a side view of the top rail piece TZL 1;
FIG. 11a is a top view of a top wall beam block TQL 1;
FIG. 11b is a side view of the top wall beam block TQL 1;
FIG. 12 is a side view of the connection of center stringer block ZZL1 with center pillar Z1;
FIG. 13 is a side view of the connection of the center sill block ZQL1 to the wall stud QZ 1;
FIG. 14 is a side view of the connection of the top rail piece TZL1 to the center pillar Z1;
FIG. 15 is a side view of the connection of the top wall beam block TQL1 with the wall stud QZ 1;
fig. 16 is a side view of the connection of the bottom rail block DZL1 (bottom wall rail block DQL1) to center pillar Z1 (wall pillar QZ 1);
FIG. 17 is a schematic view of the construction of wall studs QZ1 and beam block longitudinal ribs;
fig. 18 is a schematic view of the construction mode of the center pillar Z1 and the longitudinal bar of the beam block.
The component names and corresponding labels are shown in the figure: the bottom longitudinal beam block DZL1, the bottom wall beam block DQL1, the bottom transverse beam block DHL1, the wall column QZ1, the middle upright column Z1, the bottom plate block DB1, a first post-cast joint DXJ1 of the bottom plate, a second post-cast joint DXJ2 of the bottom plate and a post-cast strip DXJ3 of the bottom plate; the middle longitudinal beam block ZZL1, the middle wall beam block ZQL1, the middle cross beam block ZHL1, a middle plate precast slab ZB1, a middle plate first post-cast node ZXJ1, a middle plate second post-cast node ZXJ2, a middle plate third post-cast node ZXJ3, a middle plate fourth post-cast node ZXJ4 and a middle plate laminated layer ZXJ 5; the roof longitudinal beam block TZL1, the roof wall beam block TQL1, the roof cross beam block THL1, the roof precast slab TB1, the first post-cast node TXJ1 of the roof, the second post-cast node TXJ2 of the roof, the third post-cast node TXJ3 of the roof, the fourth post-cast node TXJ4 of the roof and the roof laminated layer TXJ 5; a first sidewall block Q1, a second sidewall block Q2; the side wall structure comprises a side wall first post-cast strip QXJ1, a side wall second post-cast strip QXJ2, a step-shaped side plate 10, a middle spanning groove 11 and an end boss 12.
Detailed Description
Referring to fig. 1 to 5, the assembly type construction method of a subway station of the present invention comprises the following steps:
step 1, constructing the subway station by adopting an open cut or cover cut method, and finishing dewatering and drainage, foundation pit enclosing structure, foundation pit excavation, temporary support erection and waterproof layer construction according to an implementation sequence;
step 2, starting the positioning and assembling of the prefabricated components of the bottom plate according to the designed positioning, and connecting the steel bars in the beam column nodes and the post-cast part of the beam slab of the part to finish the concrete casting of the cast-in-place part of the bottom plate;
step 3, dismantling the support of the foundation pit enclosure structure between the middle plate and the bottom plate, assembling a first side wall block Q1 between the middle plate and the bottom plate, connecting the reinforcing steel bars in the post-cast part of the wall plate, and completing the concrete casting of the cast-in-place part of the lower side wall;
step 4, positioning and assembling the middle plate frame prefabricated component, installing and connecting the reinforcing steel bars in the post-cast part of the beam-column joints of the part, completing the concrete casting of the cast-in-place part of the middle plate frame, and realizing the consolidation of the middle plate frame prefabricated component and the column component in the bottom plate prefabricated component;
step 5, after the middle plate is accurately determined to be provided with the hole, positioning, laying and assembling the middle plate precast slabs ZB1, binding the laminated slab steel bars on the middle plate precast slabs ZB1, and finishing the concrete pouring of the cast-in-place part of the middle plate;
step 6, dismantling the support of the foundation pit enclosure structure between the middle plate and the top plate, assembling a second side wall block Q2 between the middle plate and the top plate, installing and connecting reinforcing steel bars in the post-cast part of the wall plate, and completing concrete casting of the upper side wall cast-in-place part;
step 7, positioning and assembling the prefabricated components of the top plate frame, connecting the reinforcing steel bars in the post-cast parts of the beam-column joints of the parts, completing the concrete casting of the cast-in-place parts of the top plate frame, and realizing the consolidation of the column type components in the prefabricated components of the top plate frame and the middle plate;
and 8, after the top plate is accurately determined to be provided with the hole, positioning, laying and assembling the top plate prefabricated plate TB1, binding the steel bars of the laminated slab on the top of the top plate prefabricated plate TB1, and finishing the concrete pouring of the cast-in-place part of the top plate surface.
The invention effectively simplifies the design of underground structure and construction, accelerates construction speed, improves construction quality, can effectively save the consumption of concrete and reinforcing steel bars, and is beneficial to reducing construction cost. Compared with the traditional method, when the middle plate is an assembled laminated plate, the thickness of the plate of the post-existing station is reduced by 37.5% -50%, and the thickness of the plate of the post-free station is reduced by 50% -64%, so that the method has good technical and economic benefits.
The subway station fabricated construction comprises a fabricated structure part and a cast-in-place part. The assembled structure part mainly comprises bottom plate frame prefabricated components, a bottom plate prefabricated plate DB1, middle plate frame prefabricated components, middle plate prefabricated plates ZB1, top plate frame prefabricated components, top plate prefabricated plates TB1 and the like, and the sizes and the reinforcing bars of the prefabricated components are determined according to specific stress calculation of a construction stage and a use stage. The cast-in-place part can be divided into a post-cast joint between the prefabricated frame beam and the prefabricated frame column, a post-cast strip between the prefabricated frame and the prefabricated bottom plate and between the prefabricated frame and the prefabricated side wall, and a post-cast laminated layer of the middle plate and the top plate. And the positions of the post-cast joint and the post-cast strip are arranged in areas with small bending moment and shearing force according to the integral stress of the structure. Referring to fig. 4, a stress frame structure system is formed by the beams, the columns, the bottom plate and the side wall members, and the problem of overall stress of the subway station is effectively solved. After the beam, the column, the bottom plate and the side wall assembled components are finished and the wet joints are poured and the strength is reached, the middle plate and the top plate prefabricated components are installed according to the requirements of the construction period, and the cast-in-place laminated layer is implemented. The middle plate precast slab ZB1 and the top plate precast slab TB1 bear vertical load in the projection range of the middle plate precast slab ZB1 and transmit the load to the beam precast elements on the same layer. The invention can simplify the design and construction, optimize the size of the component, improve the construction quality, save the manufacturing cost, save the energy and reduce the carbon emission. The information management and the standardized design can be realized through a Building Information Model (BIM) technology, and the multi-working-surface mechanized flow construction can be realized.
Referring to the embodiment shown in fig. 1, 4 and 5, the floor prefabricated part comprises a bottom longitudinal beam block DZL1, a bottom wall beam block DQL1, a bottom cross beam block DHL1, a wall column QZ1, a center pillar Z1 and a floor block DB 1. The bottom longitudinal beam block DZL1 and the bottom wall beam block DQL1 are arranged along the length direction of a station, the bottom cross beam block DHL1 is arranged along the width direction of the station, the wall column QZ1 and the middle upright column Z1 are arranged along the height direction of the station, the middle upright column Z1 is positioned at the intersection position of the bottom longitudinal beam block DZL1 and the bottom cross beam block DHL1, and the wall column QZ1 is positioned at the intersection position of the bottom wall beam block DQL1 and the bottom cross beam block DHL 1. The bottom plate block DB1 is positioned in a rectangular range enclosed by the bottom longitudinal beam block DZL1, the bottom wall beam block DQL1 and the bottom cross beam block DHL 1. The cast-in-place part of the bottom plate comprises a first post-cast joint DXJ1, a second post-cast joint DXJ2 of the bottom plate and a post-cast strip DXJ3 of the bottom plate. The first rear pouring node DXJ1 of the bottom plate is arranged in the intersection area of the end of the bottom wall beam block DQL1 and the end of the bottom cross beam block DHL1 with the wall column QZ1 and is used for connecting the bottom wall beam block DQL1, the bottom cross beam block DHL1 and the wall column QZ 1; the second rear pouring node DXJ2 of the bottom plate is arranged in the intersection area of the end part of the bottom longitudinal beam block DZL1, the end part of the bottom cross beam block DHL1 and the middle upright post Z1 and is used for connecting the bottom longitudinal beam block DZL1, the bottom cross beam block DHL1 and the middle upright post Z1. The bottom plate post-cast strip DXJ3 is arranged between the bottom plate block DB1 and the bottom longitudinal beam block DZL1, the bottom wall beam block DQL1 and the bottom cross beam block DHL1 and is used for connecting the bottom longitudinal beam block DZL1, the bottom wall beam block DQL1, the bottom cross beam block DHL1 and the bottom plate block DB 1.
Referring to the embodiment shown in fig. 2, 4 and 5, the middle plate frame prefabricated parts comprise a middle longitudinal beam block ZZL1, a middle cross beam block ZHL1, a middle wall beam block ZQL1, a wall column QZ1 and a middle upright column Z1. The middle longitudinal beam block ZZL1 and the middle wall beam block ZQL1 are arranged along the length direction of the station, the middle cross beam block ZHL1 is arranged along the width direction of the station, and the wall column QZ1 and the middle upright column Z1 are arranged along the height direction of the station. The middle upright post Z1 is positioned at the intersection position of the middle longitudinal beam block ZZL1 and the middle cross beam block ZHL1, and the wall post QZ1 is positioned at the intersection position of the middle wall beam block ZQL1 and the middle cross beam block ZHL 1. The middle plate frame cast-in-place part comprises a middle plate first post-cast node ZXJ1, a middle plate second post-cast node ZXJ2, a middle plate third post-cast node ZXJ3 and a middle plate fourth post-cast node ZXJ 4. The middle plate first post-cast joint ZXJ1 is arranged in the intersection area of the end part of the middle beam block ZHL1, the end part of the middle wall beam block ZQL1 and the wall column QZ1 and is used for connecting the middle beam block ZHL1, the middle wall beam block ZQL1 and the wall column QZ 1; and the middle plate second post-cast joint ZXJ2 is arranged in the intersection area of the end part of the middle cross beam block ZHL1, the end part of the middle longitudinal beam block ZZL1 and the middle upright post Z1 and is used for connecting the middle longitudinal beam block ZZL1, the middle cross beam block ZHL1 and the middle upright post Z1. The middle plate third post-cast joint ZXJ3 is arranged in the crossing region between the end of the middle cross beam ZHL1 and the middle wall beam block ZQL1 and is used for connecting the middle cross beam block ZHL1 and the middle wall beam block ZQL 1. The middle plate fourth post-cast joint ZXJ4 is arranged in a cross-center intersection area of the end portion of the middle cross beam ZHL1 and the middle longitudinal beam block ZZL1 and is used for connecting the middle cross beam block ZHL1 and the middle longitudinal beam block ZZL 1. The cast-in-place part of the middle plate surface is a middle plate laminated layer ZXJ5 formed by concrete poured on the top surface of the middle plate precast slab ZB 1.
Referring to fig. 1 and 5, after the cast-in-place part of the middle slab is completely finished, a first side wall block Q1 is installed, wherein the side wall block Q1 is located in the rectangular range enclosed by the wall columns QZ1, the bottom wall beam block DQL1 and the middle wall beam block ZQL 1. The wall post-cast strip QXJ1 is arranged between the side wall block Q1 and the wall column QZ1, the bottom wall beam block DQL1 and the middle wall beam block ZQL1, and is used for connecting the wall column QZ1, the bottom wall beam block DQL1, the middle wall beam block ZQL1 and the first side wall block Q1.
Referring to fig. 4 and 5, the column members are an integral member from the bottom plate to the top plate, column member steel bars are reserved at the joint positions of the bottom plate, the middle plate and the top plate, and after the prefabricated members of the bottom plate are installed and positioned, the joints are cast in situ to form a whole. The column member can be fixed by adopting temporary support in the initial positioning stage.
Referring to the embodiment shown in fig. 3, 4 and 5, the roof frame prefabricated part includes a roof girder block TZL1, a roof beam block THL1, a roof wall beam block TQL1, a center pillar Z1 and a wall stud QZ1, the roof girder block TZL1 and the roof wall beam block TQL1 are arranged along the length direction of the station, the roof beam block THL1 is arranged along the width direction of the station, the center pillar Z1 and the wall stud QZ1 are arranged along the height direction of the station, the center pillar Z1 is located at the position where the roof girder block TZL1 intersects with the roof beam block THL1, and the wall stud QZ1 is located at the position where the roof wall stud block TQL1 intersects with the roof beam block THL 1. The roof frame cast-in-place section includes a roof first post-cast node TXJ1, a roof second post-cast node TXJ2, a roof third post-cast node TXJ3, and a roof fourth post-cast node TXJ 4. The first post-cast node TXJ1 of roof plate sets up in the crossing region of top crossbeam piece THL1 tip, top wall beam piece TQL1 tip and wall post QZ1 for connect well crossbeam piece ZHL1, well wall beam piece ZQL1 and wall post QZ 1. The second post-cast joint TXJ2 of the top plate is arranged at the intersection region of the end of the top beam block THL1, the end of the top longitudinal beam block TZL1 and the middle upright post Z1 and is used for connecting the top longitudinal beam block TZL1, the top beam block THL1 and the middle upright post Z1. The top plate third post-cast joint TXJ3 is arranged at the cross-over intersection area between the end of the top cross beam THL1 and the top wall beam block TQL1 and is used for connecting the top cross beam block THL1 and the top wall beam block TQL 1. The top plate fourth post-cast node TXJ4 is arranged in the crossing area between the end of the top cross beam THL1 and the top longitudinal beam block TZL1 and is used for connecting the top cross beam block THL1 and the top longitudinal beam block TZL 1. The cast-in-place part of the top plate surface is a top plate laminated layer TXJ5 formed by concrete poured on the top surface of the middle plate precast slab ZB 1.
The concrete adopted by the cast-in-place partial laminated layer is high-performance concrete or cement-based composite material, and the strength grade and the mechanical property of the concrete are not lower than C50.
The bottom longitudinal beam block DZL1, the bottom wall beam block DQL1, the middle longitudinal beam block ZZL1, the middle wall beam block ZQL1, the top longitudinal beam block TZL1 and the top wall beam block TQL1 are provided with beam end step type side plate 10 structures, so that a template is not needed for a cast-in-place part of a beam column node, and the node arrangement stress performance of the cast-in-place part of a frame is good.
Referring to fig. 2 and 5, after the top slab cast-in-place part is completely finished, a second side wall block Q2 is installed, wherein the side wall block Q2 is positioned in the rectangular range enclosed by the wall column QZ1, the middle wall beam block ZQL1 and the top wall beam block TQL 1. The wall post-cast strip QXJ2 is arranged between the side wall block Q2 and the wall column QZ1, the middle wall beam block ZQL1 and the top wall beam block TQL1 and is used for connecting the wall column QZ1, the middle wall beam block ZQL1, the top wall beam block TQL1 and the second side wall block Q2.
Referring to fig. 1, 4 and 5, the bottom wall beam DQL1 has an L-shaped beam section with a key slot, and the section enables the bottom wall beam DQL1, the bottom plate block DB1 and the post-cast strip of the side wall block Q1 to be located at positions with small bending moment and small shearing force, so that the structure has good stress performance.
Referring to fig. 2, 4 and 5, the middle wall beam ZQL1 has a T-shaped beam section with a key slot, which enables the middle wall beam ZQL1 to have load bearing capacity and rigidity in both horizontal and vertical directions, and the cross-sectional size and rigidity of the first post-cast node ZXJ1 of the T-shaped middle plate formed with the middle cross beam ZHL1 are larger than those of a standard cross section, so that the structural stress performance is good.
Referring to fig. 3, 4 and 5, the top wall beam TQL1 has a keyed L-shaped beam section, which provides the top wall beam TQL1 with load bearing capacity and rigidity in both horizontal and vertical directions, and the first post-cast node TXJ1 of the L-shaped top plate formed by the top cross beam THL1 has a larger section size and rigidity than a standard section, and has good structural stress performance.
Referring to fig. 6a and 6b, the beam end of the bottom rail block DZL1 has a pair of stepped side panels 10. Referring to fig. 7a and 7b, the beam end of the sill block DQL1 has a stepped side plate 10. Connecting spaces between the reserved middle upright post Z1 and the middle cross beam block ZHL1 play a role of a bottom plate post-cast node TXJ1 and a bottom plate post-cast node TXJ2 template, and the quality and integrity of the post-cast node are guaranteed.
Referring to fig. 8a and 8b, the beam end of the middle longitudinal beam block ZZL1 is provided with a pair of step-shaped side plates 10, a connecting space is reserved for connecting the middle vertical column Z1 and the middle cross beam block ZHL1, and the middle longitudinal beam block ZZL1 plays a role of a middle plate second post-cast joint ZXJ2 template, so that the quality and integrity of the post-cast joint are ensured. And a middle cross beam block ZZL1 is provided with a middle spanning groove 11, and a connecting space is reserved for the middle cross beam block ZHL 1.
Referring to fig. 9a and 9b, the beam end of the middle wall beam block ZQL1 is provided with a step-shaped side plate 10 and an end boss 12, a connecting space with a wall column QZ1 and a middle beam block ZHL1 is reserved, and the middle wall beam block ZQL1 plays a role of a middle plate first post-cast joint ZXJ1 template, so that the quality and integrity of the post-cast joint are guaranteed. And a middle spanning groove 11 is arranged on the middle wall beam block ZQL1, and a connecting space with the middle beam block ZHL1 is reserved.
Referring to fig. 10a and 10b, the beam end of the top longitudinal beam block TZL1 has a pair of step-shaped side plates 10, which reserve a connection space with the upright column Z1 and the top cross beam block THL1, and function as a template for the second post-cast joint TXJ2 of the top plate, so as to ensure the quality and integrity of the post-cast joint. The roof longitudinal beam block TZL1 is provided with a middle spanning groove 11, and a connecting space is reserved for the roof longitudinal beam block ZHL 1.
Referring to fig. 11a and 11b, the beam end of the top wall beam block TQL1 has a step-shaped side plate 10 and is provided with an end boss 12, a connecting space between the wall column QZ1 and the top beam block THL1 is reserved, and the top wall beam block TQL1 plays a role of a first post-cast joint TXJ1 template of the top plate, so that the quality and integrity of the post-cast joint are ensured. The top wall beam block TQL11 is provided with a middle spanning groove 11, and a connecting space with the middle beam block ZHL1 is reserved.
Fig. 12 to 16 are schematic views of longitudinal rib structures of cast-in-place nodes. Fig. 12 shows a longitudinal rib structure of a middle longitudinal beam block ZZL1 and a middle upright post Z1 at a middle plate second post-cast node ZXJ2, fig. 13 shows a longitudinal rib structure of a middle wall beam block ZQL1 and a wall post QZ1 at a middle plate first post-cast node ZXJ1, fig. 14 shows a longitudinal rib structure of a top longitudinal beam block TZL1 and a middle upright post Z1 at a top plate second post-cast node TXJ2, fig. 15 shows a longitudinal rib structure of a top wall beam block TQL1 and a wall post QZ1 at a top plate first post-cast node TXJ1, and fig. 16 shows a longitudinal rib structure of a bottom longitudinal beam block DZL1 (or a bottom wall beam block DQL1) and a middle upright post Z1 (or a wall post QZ1) at a bottom plate second post-cast node DXJ2 (or a bottom plate first post-cast node dxlj 1). Referring to fig. 12 to 16, the stepped side plates 10 of the girder block function as side formworks in the height range of the post-cast node girder.
Fig. 17 is a schematic view of a construction mode of wall columns QZ1 and longitudinal bars of a beam block, and shows a longitudinal bar structure of wall columns QZ1, bottom beam block DHL1, middle beam block ZHL1 and top beam block THL1 at nodes, wherein the longitudinal bars of the upper edges of the middle beam block ZHL1 and the top beam block THL1 need to be bound and installed on site before being poured at a middle plate first post-pouring node ZXJ1, a top plate first post-pouring node TXJ1, a middle plate laminated layer ZXJ5 and a top plate laminated layer TXJ5, and the rest longitudinal bars are prefabricated spare steel bars.
Fig. 18 is a schematic diagram of a structure mode of a middle upright Z1 and a longitudinal rib of a beam block, and shows a longitudinal rib structure of the middle upright Z1, a bottom beam block DHL1, a middle beam block ZHL1, and a top beam block THL1 at a node, wherein the longitudinal ribs of the middle beam block ZHL1 and the top beam block THL1 need to be bound and installed on site before pouring at a middle plate second post-pouring node ZXJ2, a top plate second post-pouring node TXJ2, a middle plate laminated layer ZXJ5, and a top plate laminated layer TXJ5, and the rest of the longitudinal ribs are reserved steel bars of prefabricated components.
The foregoing is illustrative of the basic method and principles of the present invention for the fabrication of a subway station, and is not intended to limit the invention to the exact construction, operation, and application shown and described, and accordingly, all modifications and equivalents that may be resorted to are intended to fall within the scope of the invention.
Claims (9)
1. An assembly type construction method of a subway station comprises the following steps:
step 1, constructing the subway station by adopting an open cut or cover cut method, and finishing dewatering and drainage, foundation pit enclosing structure, foundation pit excavation, temporary support erection and waterproof layer construction according to an implementation sequence;
step 2, starting the positioning and assembling of the prefabricated components of the bottom plate according to the designed positioning, and connecting the steel bars in the beam column nodes and the post-cast part of the beam slab of the part to finish the concrete casting of the cast-in-place part of the bottom plate;
step 3, dismantling the support of the foundation pit enclosure structure between the middle plate and the bottom plate, assembling a first side wall block (Q1) between the middle plate and the bottom plate, connecting the reinforcing steel bars in the post-cast part of the wall plate, and completing the concrete casting of the cast-in-place part of the lower side wall;
step 4, positioning and assembling the middle plate frame prefabricated component, connecting the reinforcing steel bars in the post-cast part of the beam-column joints of the part, completing the concrete casting of the cast-in-place part of the middle plate frame, and realizing the consolidation of the middle plate frame prefabricated component and the column type component in the bottom plate prefabricated component;
step 5, after the middle plate is accurately determined to be perforated, the middle plate precast slabs (ZB1) are positioned, laid and assembled, laminated slab steel bars on the middle plate precast slabs (ZB1) are bound, and concrete pouring of the cast-in-place part of the middle plate is completed;
step 6, dismantling the support of the foundation pit enclosure structure between the middle plate and the top plate, assembling a second side wall block (Q2) between the middle plate and the top plate, connecting the reinforcing steel bars in the post-cast part of the wall plate, and completing the concrete casting of the cast-in-place part of the upper side wall;
step 7, positioning and assembling the prefabricated components of the top plate frame, connecting the reinforcing steel bars in the post-cast parts of the beam-column joints of the parts, completing the concrete casting of the cast-in-place parts of the top plate frame, and realizing the consolidation of the column type components in the prefabricated components of the top plate frame and the middle plate;
and 8, after the top plate is accurately determined to be provided with the opening, positioning, laying and assembling the top plate precast slab (TB1), binding laminated slab steel bars on the top plate precast slab (TB1), and completing concrete pouring of the cast-in-place part of the top plate surface.
2. The assembly type building method of the subway station as claimed in claim 1, wherein: the bottom plate prefabricated part comprises a bottom longitudinal beam block (DZL1), a bottom wall beam block (DQL1), a bottom cross beam block (DHL1), a wall column (QZ1), a middle upright column (Z1) and a bottom plate block (DB 1); the bottom longitudinal beam block (DZL1) and the bottom wall beam block (DQL1) are arranged along the length direction of a station, the bottom transverse beam block (DHL1) is arranged along the width direction of the station, the wall column (QZ1) and the middle upright column (Z1) are arranged along the height direction of the station, the middle upright column (Z1) is positioned at the intersection position of the bottom longitudinal beam block (DZL1) and the bottom transverse beam block (DHL1), and the wall column (QZ1) is positioned at the intersection position of the bottom wall beam block (DQL1) and the bottom transverse beam block (DHL 1); the bottom plate block (DB1) is positioned in the rectangular range enclosed by the bottom longitudinal beam block (DZL1), the bottom wall beam block (DQL1) and the bottom transverse beam block (DHL 1).
3. An assembly type construction method of a subway station as claimed in claim 2, characterized in that: the bottom plate cast-in-place part comprises a first post-cast node (DXJ1), a bottom plate second post-cast node (DXJ2) and a bottom plate post-cast strip (DXJ 3); the first rear pouring node (DXJ1) of the bottom plate is arranged at the intersection area of the end part of the bottom wall beam block (DQL1), the end part of the bottom beam block (DHL1) and the wall column (QZ1) and is used for connecting the bottom wall beam block (DQL1), the bottom beam block (DHL1) and the wall column (QZ 1); the second rear pouring node (DXJ2) of the bottom plate is arranged at the intersection area of the end part of the bottom longitudinal beam block (DZL1), the end part of the bottom transverse beam block (DHL1) and the middle upright post (Z1) and is used for connecting the bottom longitudinal beam block (DZL1), the bottom transverse beam block (DHL1) and the middle upright post (Z1); the bottom plate post-cast strip (DXJ3) is arranged at the part of the bottom plate with smaller bending moment and shearing force and is used for connecting the bottom longitudinal beam block (DZL1), the bottom wall beam block (DQL1), the bottom transverse beam block (DHL1) and the bottom plate block (DB 1).
4. An assembly type construction method of a subway station as claimed in claim 2, characterized in that: the middle plate frame prefabricated part comprises a middle longitudinal beam block (ZZL1), a middle cross beam block (ZHL1), a middle wall beam block (ZQL1), a wall column (QZ1) and a middle upright column (Z1). The middle longitudinal beam block (ZZL1) and the middle wall beam block (ZQL1) are arranged along the length direction of the station, the middle transverse beam block (ZHL1) is arranged along the width direction of the station, and the wall column (QZ1) and the middle upright column (Z1) are arranged along the height direction of the station; the middle upright post (Z1) is positioned at the intersection position of the middle longitudinal beam block (ZZL1) and the middle cross beam block (ZHL1), and the wall post (QZ1) is positioned at the intersection position of the middle wall beam block (ZQL1) and the middle cross beam block (ZHL 1).
5. An assembly type construction method of a subway station as claimed in claim 4, characterized in that: the middle plate frame cast-in-place part comprises a middle plate first post-cast node (ZXJ1), a middle plate second post-cast node (ZXJ2), a middle plate third post-cast node (ZXJ3) and a middle plate fourth post-cast node (ZXJ 4); the middle plate first post-cast node (ZXJ1) is arranged in the intersection area of the end part of the middle beam block (ZHL1), the end part of the middle wall beam block (ZQL1) and the wall column (QZ1) and is used for connecting the middle beam block (ZHL1), the middle wall beam block (ZQL1) and the wall column (QZ 1); the middle plate second post-cast joint (ZXJ2) is arranged in the intersection area of the end part of the middle beam block (ZHL1), the end part of the middle beam block (ZZL1) and the middle upright post (Z1) and is used for connecting the middle beam block (ZZL1), the middle beam block (ZHL1) and the middle upright post (Z1); the middle plate third post-cast joint (ZXJ3) is arranged in a cross area between the end of the middle cross beam (ZHL1) and the middle wall beam block (ZQL1) and is used for connecting the middle cross beam block (ZHL1) and the middle wall beam block (ZQL 1); the middle plate fourth post-cast joint (ZXJ4) is arranged in a cross-center intersecting area of the end part of the middle cross beam (ZHL1) and the middle longitudinal beam block (ZZL1) and is used for connecting the middle cross beam block (ZHL1) and the middle longitudinal beam block (ZZL 1); the cast-in-place part of the middle plate surface is a middle plate laminated layer (ZXJ5) formed by concrete poured on the top surface of a middle plate precast slab (ZB 1).
6. An assembly type construction method of a subway station as claimed in claim 4, characterized in that: the top plate frame prefabricated part comprises a top longitudinal beam block (TZL1), a top transverse beam block (THL1), a top wall beam block (TQL1), a middle upright post (Z1) and a wall post (QZ 1); the top longitudinal beam block (TZL1) and the top wall beam block (TQL1) are arranged along the length direction of a station, the top transverse beam block (THL1) is arranged along the width direction of the station, the middle upright post (Z1) and the wall post (QZ1) are arranged along the height direction of the station, the middle upright post (Z1) is positioned at the intersection position of the top longitudinal beam block (TZL1) and the top transverse beam block (THL1), and the wall post (QZ1) is positioned at the intersection position of the top longitudinal beam block (TQ 1) and the top transverse beam block (THL 1).
7. The assembly type building method of the subway station as claimed in claim 6, wherein: the roof frame cast-in-place section comprises a roof first post-cast node (TXJ1), a roof second post-cast node (TXJ2), a roof third post-cast node (TXJ3) and a roof fourth post-cast node (TXJ 4); the first post-cast joint (TXJ1) of the top plate is arranged at the intersection area of the end part of the top beam block (THL1), the end part of the top wall beam block (TQL1) and the wall column (QZ1) and is used for connecting the middle beam block (ZHL1), the middle wall beam block (ZQL1) and the wall column (QZ 1); the second post-cast joint (TXJ2) of the top plate is arranged in the intersection area of the end part of the top beam block (THL1), the end part of the top beam block (TZL1) and the middle upright post (Z1) and is used for connecting the top beam block (TZL1), the top beam block (THL1) and the middle upright post (Z1); the third post-cast node (TXJ3) of the top plate is arranged in the cross region between the end part of the top cross beam (THL1) and the top wall beam block (TQL1) and is used for connecting the top cross beam block (THL1) and the top wall beam block (TQL 1); the top plate fourth post-cast node (TXJ4) is arranged in the crossing area of the end part of the top cross beam (THL1) and the top longitudinal beam block (TZL1) and is used for connecting the top cross beam block (THL1) and the top longitudinal beam block (TZL 1); the cast-in-place part of the top plate surface is a top plate laminated layer (TXJ5) formed by concrete poured on the top surface of the middle plate precast slab (ZB 1).
8. An assembly type construction method of a subway station as claimed in any one of claims 2 to 8, characterized in that: the step type side plates (10) are arranged at the beam ends of the bottom longitudinal beam block (DZL1), the bottom wall beam block (DQL1), the middle longitudinal beam block (ZZL1), the middle wall beam block (ZQL1), the top longitudinal beam block (TZL1) and the top wall beam block (TQL 1); a middle-crossing groove (11) is formed in the middle longitudinal beam block (ZZL1), the middle wall beam block (ZQL1), the top longitudinal beam block (TZL1) and the top wall beam block (TQL 1); the beam ends of the middle wall beam block (ZQL1) and the top wall beam block (TQL1) are provided with end bosses (12).
9. An assembly type construction method of a subway station as claimed in claim 8, characterized in that: the bottom wall beams (DQL1) have a keyed L-beam section, the middle wall beams (ZQL1) have a keyed T-beam section, and the top wall beams (TQL1) have a keyed L-beam section.
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