CN117822648A - Permanent-face combined integral assembly type subway station structure and construction method - Google Patents
Permanent-face combined integral assembly type subway station structure and construction method Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 44
- 238000011065 in-situ storage Methods 0.000 claims abstract description 83
- 239000004567 concrete Substances 0.000 claims abstract description 21
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 239000011083 cement mortar Substances 0.000 claims description 8
- 239000004570 mortar (masonry) Substances 0.000 claims description 7
- 239000002689 soil Substances 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims 1
- 238000009412 basement excavation Methods 0.000 description 5
- 238000004873 anchoring Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000004078 waterproofing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
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- 238000013138 pruning Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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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
- E02D31/02—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 against ground humidity or ground water
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Abstract
The invention discloses a permanent face combined integral assembly type subway station structure and a construction method, comprising a group of opposite prefabricated underground continuous walls, wherein the prefabricated underground continuous walls are sequentially connected with a cast-in-situ top waist beam, a cast-in-situ middle waist beam and a cast-in-situ bottom plate from top to bottom, the cast-in-situ top waist beam is connected with a plurality of prefabricated top cross beams to form a first permanent face combined support, and the cast-in-situ middle waist beam is connected with a plurality of prefabricated middle cross beams to form a second permanent face combined support; the system also comprises a cast-in-situ bottom plate, wherein a bottom longitudinal beam along the longitudinal direction of the station is arranged on the bottom plate; a middle longitudinal beam joint which is horizontally and crosswise arranged is arranged in the middle of the prefabricated middle cross beam, and a block prefabricated plate is arranged between the prefabricated middle cross beams to form a prefabricated middle plate; a top longitudinal beam joint arranged horizontally in a crossing way is arranged in the middle of the prefabricated top cross beams, prefabricated laminated slabs are arranged between the prefabricated top cross beams, and concrete is poured later to form a laminated top plate structure; and cast-in-situ center posts are connected between the bottom longitudinal beam and the middle longitudinal beam and between the middle longitudinal beam and the top longitudinal beam. The invention realizes permanent combination, avoids later stage support disassembly and improves the station construction efficiency.
Description
Technical Field
The invention belongs to the technical field of building foundation construction, and particularly relates to a permanent-face combined integral assembly type subway station structure and a construction method.
Background
The fabricated building (Prefabricated Construction) refers to a construction method in which building elements are prefabricated in a factory and then assembled and installed on site.
The prefabricated building is generally efficient and energy-saving, and is beneficial to reducing construction pollution and improving production efficiency and quality safety level by adopting factory prefabrication and field assembly.
The traditional open cut subway station is generally constructed in a cast-in-situ mode, supports are supported by erecting concrete supports and steel supports in the foundation pit excavation stage, and the supports are detached and cast-in-situ when the main body is built back, so that the working efficiency is low and the waste is large.
At present, the assembled station building enclosure mainly applied in China still adopts a cast-in-situ construction method, and only the main body structure is prefabricated in a block mode, so that the engineering quantity of the building enclosure is not saved, the manufacturing cost is high, and the method does not accord with the trends of energy conservation, emission reduction and green development.
Therefore, it is necessary to develop an assembled station structure which shares the enclosure structure and the main body structure, realizes permanent combination, does not need to be disassembled and supported, combines prefabrication and cast-in-situ, does not waste resources, and saves construction period and construction cost.
Disclosure of Invention
According to the problems, the invention provides a permanent combined integral assembly type subway station structure and a construction method.
The cast-in-situ top waist beam is connected with a plurality of precast top cross beams to form a first permanent combined support, and the cast-in-situ middle waist beam is connected with a plurality of precast middle cross beams to form a second permanent combined support;
the system also comprises a cast-in-situ bottom plate, wherein a bottom longitudinal beam along the longitudinal direction of the station is arranged on the bottom plate;
a middle longitudinal beam joint which is horizontally and crosswise arranged is arranged in the middle of the prefabricated middle cross beam, and a block prefabricated plate is arranged between the prefabricated middle cross beams to form a prefabricated middle plate;
a top longitudinal beam joint arranged horizontally in a crossing manner is arranged in the middle of the prefabricated top cross beams, prefabricated laminated slabs are arranged between the prefabricated top cross beams, and concrete is poured later to form a laminated top plate structure;
and cast-in-situ center posts are connected between the bottom longitudinal beam and the center longitudinal beam and between the center longitudinal beam and the top longitudinal beam.
Preferably, the prefabricated top beam comprises a top longitudinal beam node and a negative one-layer middle column node, the top longitudinal beam node is integrally prefabricated and crossed on the prefabricated top beam, and the end part of the top longitudinal beam node is connected with a prefabricated top longitudinal beam section hoisted in the later period through a reserved joint, so that the multi-section prefabricated top longitudinal beam forms a continuous longitudinal beam structure.
Further preferably, a negative one-layer middle column node is prefabricated below the top longitudinal beam node, the negative one-layer middle column node is longitudinally arranged along a station at intervals in a supporting mode by a prefabricated top cross beam, and is connected with a subsequent reinforcing steel bar through a pre-buried connecting sleeve and then concreted, so that a negative one-layer cast-in-place middle column is formed.
Further preferably, the prefabricated middle cross beam comprises a middle longitudinal beam node and a negative two-layer middle column node, the middle longitudinal beam node is integrally prefabricated and crossed on the prefabricated middle cross beam, and the end part of the middle longitudinal beam node is connected with a prefabricated middle longitudinal beam section hoisted in the later period through a reserved joint, so that the multi-section prefabricated middle longitudinal beam forms a continuous longitudinal beam structure.
Further preferably, a second-layer middle column node is prefabricated below the middle longitudinal beam node, the second-layer middle column node is longitudinally arranged along the station at intervals in a supporting mode, and is connected with a subsequent reinforcing steel bar through a pre-buried connecting sleeve and then concreted, so that a second-layer cast-in-place middle column is formed.
Further preferably, the middle plate structure is characterized in that a plurality of precast slabs are arranged on brackets on the side surfaces of the precast middle beams, waterproof mortar is arranged on the precast slabs to serve as a waterproof layer, and cement mortar is arranged between joints of the precast middle plates to be filled.
Further preferably, the laminated roof structure is a prefabricated and cast-in-situ laminated structure, prefabricated laminated slabs are adopted as bottom templates between the prefabricated roof beams, and concrete is poured on the prefabricated laminated slabs to form a roof cast-in-situ layer.
A second object of the present invention is to:
a construction method of a permanent-face combined integral assembly type subway station, which uses a permanent-face combined integral assembly type subway station structure, comprises the following steps:
s1: constructing a foundation pit;
hanging and splicing prefabricated ground connecting walls as side walls of the enclosure structure and the main body;
excavating a foundation pit to a prefabricated top plate position, constructing a cast-in-situ top waist beam on a prefabricated ground connecting wall, connecting a prefabricated top beam, and constructing a first permanent temporary combined support;
and continuously excavating the foundation pit to the position of the prefabricated middle plate, constructing a cast-in-situ middle waist beam on the prefabricated ground connecting wall, connecting the cast-in-situ middle waist beam with the prefabricated middle cross beam, and constructing a second permanent temporary combined support.
Finally, excavating to the pit bottom, and performing foundation pad layer and external waterproof engineering;
s2: the main body is built back;
firstly, a bottom plate and a bottom longitudinal beam are cast in situ, then a cast-in-situ center pillar of a negative two-layer is applied, and precast center longitudinal beam sections are hung and spliced, so that the center longitudinal beams are connected to form a continuous longitudinal beam structure, and a precast middle plate is installed;
then, a cast-in-situ center column of a negative layer is applied, the prefabricated top longitudinal beam sections are hung and spliced to form a continuous longitudinal beam structure, and then, the prefabricated laminated slab is installed and cast-in-situ concrete is formed to form a laminated top plate structure;
s3: waterproof backfilling;
and (4) constructing water resistance outside the roof cast-in-situ layer, and backfilling foundation pit soil.
Preferably, in the step S2, the pre-buried sleeve on the node of the secondary middle column reserved on the prefabricated middle longitudinal beam is connected with the steel bar on the cast-in-situ bottom longitudinal beam, the cast-in-situ middle column of the secondary is applied, the prefabricated middle longitudinal beam segments are connected to form a continuous longitudinal beam structure, finally, a prefabricated middle plate is installed between the prefabricated middle cross beams, the joints between the prefabricated middle plates are filled with cement mortar, and a layer of waterproof mortar is poured on the prefabricated middle plate;
the prefabricated roof beam is characterized in that the prefabricated roof beam is connected with the middle beam steel bars through the embedded sleeve on the node of the middle column of the negative layer reserved under the prefabricated roof beam, the cast-in-situ middle column of the negative layer is applied, the prefabricated roof beam sections are hung and spliced to form a continuous longitudinal beam structure, and finally, the prefabricated laminated slab is installed between the prefabricated roof beams to serve as a bottom template, and concrete is cast in situ to form a laminated roof structure.
Further preferably, the cast-in-situ center posts are arranged at intervals along the longitudinal direction of the station, and the cast-in-situ center posts of the negative two layers and the cast-in-situ center posts of the negative one layer are positioned on the same vertical line.
The beneficial effects of the invention are as follows:
the invention realizes the purposes of saving the manufacturing cost and reducing the carbon emission to respond to the green low-carbon requirement, and has the following advantages:
(1) The prefabricated underground continuous wall is used as an enclosure structure and also serves as a main body side wall by adopting a system of combining a single wall instead of a composite wall, so that the side wall is reduced compared with the existing subway station, and the consumption of concrete and steel bars is saved;
(2) The top and middle plate beams are part of the main body structure and also serve as supports, so that permanent combination is realized, later support disassembly is avoided, and construction period is saved; meanwhile, the top and middle plate beams are prefabricated and assembled, so that the assembly rate is improved, the cast-in-situ equal strength is avoided, and the foundation pit excavation construction progress is accelerated;
(3) The beam is integrally prefabricated with the longitudinal beam and the center column connecting joint, so that the problem of inconvenient site construction when prefabricated members are connected in a multidirectional manner is solved, the industrialization of complex joints and the simplification of site construction are realized, and the construction efficiency and quality are improved;
(4) The middle plate is assembled by adopting a plurality of precast slabs, the top plate adopts the precast laminated slab as a bottom template, and then the upper layer is cast in situ to form an integral structure, so that the mould-free and bracket-free construction is realized, and the laminate construction is simplified.
Drawings
The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for the purpose of illustration only and thus are not limiting the scope of the present invention. Moreover, unless specifically indicated otherwise, the drawings are intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.
FIG. 1 is a plan view of a roof support for a station in the present invention;
FIG. 2 is a plan view of a station middle plate support in the present invention;
FIG. 3 is a cross-sectional view of the station pit excavation stage A-A of the present invention;
FIG. 4 is a B-B cross-sectional view of the excavation stage of the station pit in the present invention;
FIG. 5 is a plan view of a middle plate in the station body re-construction stage of the present invention;
FIG. 6 is a plan view of the roof at the station body construction stage of the present invention;
FIG. 7 is a cross-sectional view of the station of the present invention at stage C-C of use;
FIG. 8 is a cross-sectional view of the station of the present invention at stage D-D of use;
FIG. 9 is a schematic view of the prefabricated middle plate assembly of the station in the present invention;
FIG. 10 is a schematic diagram of a stacked cast-in-situ station roof in accordance with the present invention;
FIG. 11 is a diagram of the main station construction steps in the present invention;
fig. 12 is a disassembled view of a main construction method of a station in the present invention, in which:
FIG. a is a first permanent combined support for excavating a foundation pit to a top plate position;
the diagram b is to continue to excavate the foundation pit to the middle plate position and construct a second permanent temporary combined support;
figure c is a bottom plate and a side sill of the pit bottom construction which is finally excavated;
FIG. d is a construction of a negative two-layer middle column, hoisting and splicing the prefabricated middle longitudinal beam, and then installing a prefabricated middle plate;
FIG. e is a construction of a negative one-layer center pillar, hoisting and splicing the prefabricated fixed longitudinal beams, then installing the prefabricated roof laminated slab and casting in situ;
and f, the construction roof is waterproof, and the construction roof is backfilled with earth.
In the figure:
1-prefabricating a ground connecting wall; 2-cast-in-situ top waist beam; 3-prefabricating a top cross beam; 4-top longitudinal beam joints; 5-minus one-layer middle column node; 6-cast-in-situ middle waist beam; 7-prefabricating a middle cross beam; 8-middle longitudinal beam joints; 9-negative two-layer middle column node; 10-a bottom plate and a bottom longitudinal beam; 11-cast-in-situ center column; 12-prefabricating middle longitudinal beam sections; 13-prefabricating a middle plate; 14-prefabricating top rail segments; 15-prefabricating the laminated slab; 16-roof cast-in-situ layer.
Detailed Description
First, it should be noted that the following detailed description of the specific structure, characteristics, advantages, and the like of the present invention will be given by way of example, however, all descriptions are merely illustrative, and should not be construed as limiting the present invention in any way. Furthermore, any single feature described or implied in the embodiments mentioned herein, or any single feature shown or implied in the figures, may nevertheless be continued in any combination or pruning between these features (or equivalents thereof) to obtain still further embodiments of the invention that may not be directly mentioned herein. In addition, for the sake of simplicity of the drawing, identical or similar features may be indicated at one point in the same drawing.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.
The present invention will be described in detail with reference to fig. 1 to 12.
The negative first layer in the following embodiments is a hall layer, and the negative second layer is a station layer, which will not be described again.
1-8, a permanent face combined integral assembly type subway station structure comprises a group of opposite prefabricated underground continuous walls 1, wherein the prefabricated underground continuous walls 1 are sequentially connected with a cast-in-situ top waist beam 2, a cast-in-situ middle waist beam 6 and a cast-in-situ bottom plate from top to bottom through steel bar connecting sleeves pre-buried on the walls, the cast-in-situ top waist beam 2 is connected with a plurality of prefabricated top cross beams 3 to form a first permanent face combined support, and the cast-in-situ middle waist beam 6 is connected with a plurality of prefabricated middle cross beams 7 to form a second permanent face combined support;
the system also comprises a cast-in-situ bottom plate, wherein a bottom longitudinal beam along the longitudinal direction of the station is arranged on the bottom plate;
middle longitudinal beam joints which are horizontally and crosswise arranged are arranged in the middle of the prefabricated middle cross beam 7, and a block prefabricated plate is arranged between the prefabricated middle cross beams 7 to form a prefabricated middle plate 13;
a top longitudinal beam node which is horizontally and crosswise arranged is arranged in the middle of the prefabricated top cross beam 3, a prefabricated laminated slab 15 is arranged between the prefabricated top cross beams 3, and concrete is poured later to form a laminated top plate structure;
and cast-in-situ center posts 11 are connected between the bottom longitudinal beams and the center longitudinal beams and between the center longitudinal beams and the top longitudinal beams.
In the embodiment, the prefabricated underground continuous wall 1 is adopted as a guard wall and also serves as a main body side wall, the prefabricated underground continuous wall 1 is prefabricated in a factory, and a wall embedded bar connecting sleeve is connected with the cast-in-situ top waist rail 2, the cast-in-situ middle waist rail 6 and the cast-in-situ bottom plate.
The foundation pit excavation stage adopts a prefabricated top beam 3 and a prefabricated middle beam 7 which are used as a first support and a second support.
One side of the cast-in-situ top waist beam 2 and one side of the cast-in-situ middle waist beam 6 are connected with the prefabricated underground continuous wall 1 through pre-buried steel bar connecting sleeves, the other side of the cast-in-situ top waist beam is connected with steel bars reserved at the supporting end parts of the prefabricated top cross beam 3 and the prefabricated middle cross beam 7, and the prefabricated cross beam is supported and effectively connected with the prefabricated underground continuous wall 1 through the cast-in-situ waist beam. The structure realizes permanent combination and can avoid the problem of post-stage support disassembly.
The outer waterproof is applied when the pit is excavated to the bottom of the pit, and the bottom plate and the side sill 10 are cast in situ. When the main body is built back, the middle column 11 is cast in situ in sections from bottom to top and is arranged between the bottom longitudinal beam and the middle longitudinal beam and between the middle longitudinal beam and the top longitudinal beam.
Further, it may be considered in the embodiment that the prefabricated top beam 3 includes a top longitudinal beam node 4 and a negative one-layer middle column node 5, the top longitudinal beam node 4 is integrally prefabricated and crossed on the prefabricated top beam 3, and an end portion of the top longitudinal beam node 4 is connected with a prefabricated top longitudinal beam segment 14 hoisted in a later period through a reserved joint, so that a multi-section prefabricated top longitudinal beam forms a continuous longitudinal beam structure.
In this embodiment, the top longitudinal beam node 4 and the prefabricated top cross beam 3 are in a crisscross structure and are prefabricated integrally. During construction, the prefabricated top longitudinal beam sections 14 are vertically placed in place by adopting a gantry crane, joints are reserved at two ends of the prefabricated top longitudinal beam sections 14 for connecting the top longitudinal beam joints 4, and connection can be performed through bolting or welding, so that a continuous longitudinal beam structure is formed.
Furthermore, in the embodiment, it may be considered that the next-layer middle column node 5 is prefabricated below the top longitudinal beam node 4, the next-layer middle column node 5 is supported and arranged along the longitudinal direction of the station by a prefabricated top cross beam 3, and concrete is poured after the prefabricated top cross beam is connected with the subsequent steel bars through a pre-buried connecting sleeve, so as to form the next-layer cast-in-place middle column 11.
Still further, it may be considered in the embodiment that the prefabricated middle cross beam includes a middle longitudinal beam node 8 and a negative two-layer middle column node 9, the middle longitudinal beam node 8 is integrally prefabricated and cross-arranged on the prefabricated middle cross beam 7, and an end portion of the middle longitudinal beam node 8 is connected with a prefabricated middle longitudinal beam segment 12 hoisted in a later period through a reserved joint, so that the multi-section prefabricated middle longitudinal beam forms a continuous longitudinal beam structure.
In this embodiment, the center sill node 8 and the prefabricated center sill 7 are in a crisscross structure and are prefabricated integrally. During construction, the prefabricated middle longitudinal beam section 12 is also vertically placed in place by adopting a gantry crane, joints are reserved at two ends of the prefabricated middle longitudinal beam section 12 for connecting the middle longitudinal beam joint 8, and the connection can be performed through bolting or welding, so that a continuous longitudinal beam structure is formed.
Furthermore, in the embodiment, it may be considered that the second-layer middle column node 9 is prefabricated below the middle longitudinal beam node 8, the second-layer middle column node 9 is supported and arranged along the longitudinal direction of the station by the first prefabricated middle cross beam 7, and is connected with the subsequent reinforcing steel bars through the pre-embedded connecting sleeve, and concrete is poured, so as to form the second-layer cast-in-place middle column 11.
Still further, it is also contemplated in the embodiment that the middle plate structure is formed by installing a plurality of prefabricated plates on brackets at the side surfaces of the prefabricated middle beam, the prefabricated plates are provided with waterproof mortar as a waterproof layer, and the joints between the prefabricated middle plates 13 are filled with cement mortar.
In fig. 9, prefabricated middle plates 13 are prefabricated in a factory and transported to site for installation, joints between the prefabricated middle plates 13 are filled with cement mortar, and finally a layer of waterproof mortar is poured to play a role in waterproofing.
The bracket sets up in prefabricating the side of middle cross beam, and it is used for prefabricated plate installation, uses as the support.
Still further, it is also contemplated in the embodiment that the laminated roof structure is a prefabricated and cast-in-place laminated structure, and prefabricated laminated slabs are adopted as bottom templates between the prefabricated roof beams 3, and concrete is poured on the prefabricated laminated slabs 15 to form a roof cast-in-place layer 16. As shown in fig. 10, the two layers form a laminated top plate structure, which can enhance the strength and prevent water.
The complex cross beam, the longitudinal beam joints, the longitudinal beam sections and the column joints are prefabricated through factories, and the interfaces are reserved, so that the field construction difficulty is reduced.
Example 2:
a construction method of a permanent-face combined integral assembly type subway station, which uses a permanent-face combined integral assembly type subway station structure, comprises the following steps:
s1: constructing a foundation pit;
hanging and splicing the prefabricated underground continuous wall 1 to serve as a side wall of the enclosure structure and the main body;
excavating a foundation pit to a prefabricated top plate position, constructing a cast-in-situ top waist beam 2 on a prefabricated underground continuous wall 1, connecting a prefabricated top beam 3, and performing a first permanent temporary combined support;
and continuously excavating a foundation pit to the position of the prefabricated middle plate, constructing a cast-in-situ middle waist beam 6 on the prefabricated underground continuous wall 1, connecting the prefabricated middle beam 7, and performing a second permanent temporary combined support.
Finally, excavating to the pit bottom, and performing foundation pad layer and external waterproof engineering;
s2: the main body is built back;
firstly, a bottom plate and a bottom longitudinal beam 10 are cast in situ, then a cast-in-situ middle column 11 of a negative two-layer is applied, a prefabricated middle longitudinal beam section 12 is hung and spliced, the middle longitudinal beams are connected to form a continuous longitudinal beam structure, and a prefabricated middle plate 13 is installed;
then, a cast-in-situ center column 11 of a negative layer is applied, prefabricated roof girder segments 14 are hung and spliced to form a continuous girder structure, prefabricated laminated slabs 15 are installed, and cast-in-situ concrete is cast to form a laminated roof structure;
s3: waterproof backfilling;
and (5) performing water prevention outside the laminated roof structure and backfilling foundation pit soil.
Further, it may be considered that in the embodiment, in the step S2, the pre-buried sleeve on the negative two-layer middle column node 9 reserved on the prefabricated middle longitudinal beam is connected with the steel bar on the cast-in-situ bottom longitudinal beam, the cast-in-situ middle column 11 of the negative two-layer is implemented, the prefabricated middle longitudinal beam segments 12 are then hung and spliced to form a continuous longitudinal beam structure, finally, a prefabricated middle plate 13 is installed between the prefabricated middle cross beams 7, the joints between the prefabricated middle plates 13 are filled with cement mortar, and a waterproof sand layer is cast on the prefabricated middle plate 13;
the prefabricated roof beam is characterized in that the prefabricated sleeve on the middle column node 5 of the negative first layer reserved under the prefabricated roof beam is connected with the middle beam steel bars, the cast-in-situ middle column 11 of the negative first layer is applied, the prefabricated roof beam sections 14 are hung and spliced to form a continuous longitudinal beam structure, and finally, the prefabricated laminated slab 15 is installed between the prefabricated roof beams 3 to serve as a bottom template and cast in situ concrete to form a laminated roof structure.
Furthermore, it may be considered in the embodiment that the cast-in-situ center posts 11 are longitudinally arranged at intervals along the station in a certain span, and the cast-in-situ center posts 11 of the negative two layers and the cast-in-situ center posts 11 of the negative one layer are positioned on the same vertical line.
The following uses a general underground two-layer single-column double-span rectangular standard station as an example to describe the permanent-face combined assembled station structure and the construction method in detail:
the construction method comprises the following steps:
as shown in fig. 11 to 12, when in construction, the ground continuous wall 1 is prefabricated on the 1-side of each of the left and right sides according to the width and the height of the required frame, and a foundation pit is excavated after the construction is completed.
When the prefabricated roof beam is excavated to the top plate position, the prefabricated roof beam 3 is connected with the prefabricated underground continuous wall 1 through the embedded sleeve on the prefabricated underground continuous wall 1 and the cast-in-situ roof beam 2 are connected in a reinforcing steel bar anchoring manner, the other end of the cast-in-situ roof beam 2 is connected with the reserved reinforcing steel bar at the end part of the prefabricated roof beam 3 in a mutual anchoring manner, and the first permanent temporary combination support system is formed through the cast-in-situ roof beam 2.
Then gradually excavating to the middle plate position, anchoring and connecting the embedded sleeve on the prefabricated underground continuous wall 1 with the reinforcing steel bar of the cast-in-situ middle waist beam 6, mutually anchoring and connecting the other end of the cast-in-situ middle waist beam 6 with the reserved reinforcing steel bar at the end part of the prefabricated middle beam 7, and connecting the prefabricated middle beam 7 with the prefabricated underground continuous wall 1 through the cast-in-situ middle waist beam 6 to form a second permanent temporary combined support system.
Finally, excavating to the pit bottom, and performing foundation pad layer and external waterproof engineering;
after the foundation pit is excavated, the main body is put into a main body construction stage, and the cast-in-situ bottom plate and the side sill 10 are firstly constructed.
The underground is divided into 2 layers, construction is carried out from bottom to top, and a second layer of middle columns are constructed first, and then a first layer of middle columns are constructed.
Firstly, a cast-in-situ center column 11 is constructed through a pre-buried sleeve and a reinforcing steel bar on a center column joint 9 of a negative two-layer center column, then a prefabricated center girder segment 12 is vertically lowered through a portal crane to form a continuous longitudinal girder, and then a prefabricated middle plate 13 is installed between the prefabricated center girders 7. To ensure waterproofing, the joints between the prefabricated middle plates 13 are filled with cement mortar and then poured with a layer of waterproofing mortar.
And after the construction of the negative two layers is finished, continuing to construct the negative first layer upwards.
The cast-in-situ center pillar 11 is constructed by pre-buried sleeves and reinforcing steel bars on the center pillar joint 5 of the negative layer, then the prefabricated top longitudinal beam sections 14 are vertically lowered by the gantry crane to form continuous longitudinal beams, and then the prefabricated top plate laminated slab is installed between the prefabricated top cross beams 3.
The roof structure adopts the combination of prefabricated laminated slab 15 and cast-in-situ form, and prefabricated laminated slab 15 is installed between prefabricated top beam 3 as the bottom template earlier, and later cast concrete forms roof cast-in-situ layer 16, and these two layers constitute the overall structure of prefabricated roof, also can waterproof when reinforcing intensity.
Finally, the whole station structure is applied with external waterproof and backfill soil.
According to the technical scheme, the structural system is optimized, so that the stress of the member is improved, the laminated top plate is 550mm, and the thickness of the prefabricated middle plate is 350mm, so that the stress requirement can be met. In the prior art, the thickness of the top plate of a two-layer station is generally 800mm, and the thickness of the middle plate is 450mm, which is far more than the thicknesses of the top plate and the middle plate used in the invention. Therefore, the design of the invention can save the manufacturing cost, reduce the plate thickness, save the consumption of concrete and reinforcing steel bars, and ensure that the supporting strength is not reduced or even higher.
In summary, the invention provides a permanent combined integral assembly type subway station structure with an optimized frame structure and a construction method thereof.
The foregoing examples illustrate the invention in detail, but are merely preferred embodiments of the invention and are not to be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (10)
1. A face permanently and combine whole assembled subway station structure which characterized in that: the cast-in-situ combined support comprises a group of opposite prefabricated underground continuous walls (1), wherein the prefabricated underground continuous walls (1) are sequentially connected with a cast-in-situ top waist beam (2), a cast-in-situ middle waist beam (6) and a cast-in-situ bottom plate from top to bottom through reinforcement connecting sleeves pre-buried in the walls, the cast-in-situ top waist beam (2) is connected with a plurality of prefabricated top cross beams (3) to form a first permanent combined support, and the cast-in-situ middle waist beam (6) is connected with a plurality of prefabricated middle cross beams (7) to form a second permanent combined support;
the system also comprises a cast-in-situ bottom plate, wherein a bottom longitudinal beam along the longitudinal direction of the station is arranged on the bottom plate;
middle longitudinal beam joints which are horizontally arranged in a crossing mode are arranged in the middle of the prefabricated middle cross beam (7), and a block prefabricated plate is arranged between the prefabricated middle cross beams (7) to form a prefabricated middle plate (13);
a top longitudinal beam node which is horizontally and crosswise arranged is arranged in the middle of the prefabricated top cross beam (3), a prefabricated laminated slab (15) is arranged between the prefabricated top cross beams (3) and concrete is poured later to form a laminated top plate structure;
and cast-in-situ center posts (11) are connected between the bottom longitudinal beams and the center longitudinal beams and between the center longitudinal beams and the top longitudinal beams.
2. The permanent-face combined integral assembled subway station structure according to claim 1, wherein: the prefabricated top beam (3) comprises a top longitudinal beam joint (4) and a negative one-layer middle column joint (5), the top longitudinal beam joint (4) is integrally prefabricated and crossed on the prefabricated top beam (3), and the end part of the top longitudinal beam joint (4) is connected with a prefabricated top longitudinal beam section (14) hoisted in the later period through a reserved joint, so that a continuous longitudinal beam structure is formed by the multi-section prefabricated top longitudinal beam.
3. The permanent-face combined integral assembled subway station structure according to claim 2, wherein: the top longitudinal beam joint (4) is prefabricated with a negative one-layer middle column joint (5) downwards, the negative one-layer middle column joint (5) is supported and arranged along a prefabricated top cross beam (3) at a longitudinal interval of a station, and concrete is poured after being connected with a subsequent reinforcing steel bar through a pre-buried connecting sleeve, so that a negative one-layer cast-in-place middle column (11) is formed.
4. A permanent face-combining integral assembly subway station structure according to claim 3, wherein: the prefabricated middle cross beam comprises a middle longitudinal beam joint (8) and a negative two-layer middle column joint (9), wherein the middle longitudinal beam joint (8) is integrally prefabricated and crosswise arranged on the prefabricated middle cross beam (7), and the end part of the middle longitudinal beam joint (8) is connected with a prefabricated middle longitudinal beam section (12) hoisted in the later period through a reserved joint, so that a continuous longitudinal beam structure is formed by the multi-section prefabricated middle longitudinal beam.
5. The permanent-face combined integral assembled subway station structure according to claim 4, wherein: the middle longitudinal beam joint (8) is prefabricated with a second-layer middle column joint (9) downwards, the second-layer middle column joint (9) is supported and arranged along a prefabricated middle cross beam (7) at a longitudinal interval of a station, and concrete is poured after being connected with a subsequent reinforcing steel bar through a pre-buried connecting sleeve, so that a second-layer cast-in-place middle column (11) is formed.
6. The permanent-face combined integral assembled subway station structure according to claim 5, wherein: the middle plate structure is characterized in that a plurality of precast slabs are arranged on corbels on the side face of the precast middle beam (7), waterproof mortar is arranged on the precast slabs to serve as a waterproof layer, and cement mortar is arranged between joints of the precast middle plates (13) to be filled.
7. The permanent-face combined integral assembled subway station structure according to claim 6, wherein: the laminated roof structure is a prefabricated and cast-in-situ laminated structure, prefabricated laminated slabs are adopted as bottom templates between the prefabricated roof beams (3), and concrete is poured on the prefabricated laminated slabs (15) to form a roof cast-in-situ layer (16).
8. The construction method of the permanent-face combined integral assembly type subway station is characterized by comprising the following steps of:
s1: constructing a foundation pit;
hanging and splicing prefabricated ground connecting wall (1) as a side wall of the enclosure structure and the main body;
excavating a foundation pit to a prefabricated top plate position, constructing a cast-in-situ top waist beam (2) on a prefabricated underground continuous wall (1), connecting a prefabricated top beam (3), and performing a first permanent temporary combined support;
and continuously excavating a foundation pit to the position of the prefabricated middle plate, and constructing a cast-in-situ middle waist beam (6) on the prefabricated underground continuous wall (1) and connecting the prefabricated middle beam (7) to form a second permanent combined support.
Finally, excavating to the pit bottom, and performing foundation pad layer and external waterproof engineering;
s2: the main body is built back;
firstly, a bottom plate and a bottom longitudinal beam (10) are cast in situ, then a cast-in-situ center column (11) of a negative two-layer is applied, and a prefabricated center beam section (12) is hung and spliced, so that the center longitudinal beam is connected to form a continuous longitudinal beam structure, and a prefabricated middle plate (13) is installed;
then, a cast-in-situ center column (11) of the negative layer is applied, the prefabricated top longitudinal beam sections (14) are hung and spliced to form a continuous longitudinal beam structure, and then, the prefabricated laminated slab (15) is installed and cast-in-situ concrete is formed to form a laminated top plate structure;
s3: waterproof backfilling;
and (3) performing waterproof construction outside the roof cast-in-situ layer (16) and backfilling foundation pit soil.
9. The permanent-face combined integral assembled subway station structure according to claim 8, wherein: in the step S2, connecting a pre-buried sleeve on a post node (9) of a negative two-layer middle post reserved on a precast middle longitudinal beam with a reinforcing steel bar on a cast-in-situ bottom longitudinal beam, applying a cast-in-situ middle post (11) of the negative two-layer middle post, hoisting and splicing precast middle longitudinal beam sections (12) to form a continuous longitudinal beam structure, installing precast middle plates (13) between precast middle cross beams (7), filling cement mortar in joints between the precast middle plates (13), and casting a layer of waterproof mortar on the precast middle plates (13);
the prefabricated roof beam is characterized in that a pre-buried sleeve on a middle column node (5) of a negative layer reserved under the prefabricated roof beam is connected with a middle beam steel bar, a cast-in-situ middle column (11) of the negative layer is applied, prefabricated roof beam sections (14) are hung and spliced to form a continuous longitudinal beam structure, and finally a prefabricated laminated slab (15) is installed between prefabricated roof beams (3) to serve as a bottom template and cast in situ concrete to form a laminated roof structure.
10. The permanent-face combined integral assembled subway station structure according to claim 9, wherein: the cast-in-situ center posts (11) are arranged at intervals along the longitudinal direction of the station, and the cast-in-situ center posts (11) of the negative two layers and the cast-in-situ center posts (11) of the negative one layer are positioned on the same vertical line.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119041477A (en) * | 2024-10-30 | 2024-11-29 | 中国建筑第六工程局有限公司 | Subway entrance and exit main body and enclosure fully-assembled structure and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119041477A (en) * | 2024-10-30 | 2024-11-29 | 中国建筑第六工程局有限公司 | Subway entrance and exit main body and enclosure fully-assembled structure and construction method thereof |
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