CN114875959A - Assembled subway platform and construction method thereof - Google Patents
Assembled subway platform and construction method thereof Download PDFInfo
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- CN114875959A CN114875959A CN202111454841.6A CN202111454841A CN114875959A CN 114875959 A CN114875959 A CN 114875959A CN 202111454841 A CN202111454841 A CN 202111454841A CN 114875959 A CN114875959 A CN 114875959A
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- 238000010276 construction Methods 0.000 title claims abstract description 50
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 230000003014 reinforcing effect Effects 0.000 claims description 17
- 239000012779 reinforcing material Substances 0.000 claims description 15
- 239000003638 chemical reducing agent Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 14
- 239000004568 cement Substances 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 9
- 239000010453 quartz Substances 0.000 claims description 9
- 229910021487 silica fume Inorganic materials 0.000 claims description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 5
- 229920000417 polynaphthalene Polymers 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 5
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000005034 decoration Methods 0.000 claims description 3
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- 238000005266 casting Methods 0.000 description 2
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Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
Abstract
The invention discloses an assembled subway platform and a construction method thereof, wherein the assembled subway platform comprises the following steps: the subway platform is formed by splicing the column members, the beam members and the platform plate members, so that the subway platform is more rapid and convenient to install, and the problems of large occupied area, large construction difficulty, long construction period and the like in pouring construction are solved; the column body member, the beam body member and the platform plate member are all prefabricated by ultra-high performance concrete, the compressive strength of the ultra-high performance concrete is not lower than 150MPa, the flexural strength is not lower than 20MPa, and the tensile strength is not lower than 7 MPa.
Description
Technical Field
The invention relates to the field of subway construction engineering, in particular to an assembled subway platform and a construction method thereof.
Background
With the rapid development of economy, urban rail transit develops at a high speed according to the demand, the technical development of subways is more and more mature as an important vehicle for relieving urban traffic pressure, and a subway platform is an important component of a subway station and is an important platform for passengers to get on and off the subway and stay in the subway station.
In the related technology, the construction of the subway platform mainly adopts cast-in-place construction, a template needs to be erected in an underground space before the concrete is poured, the template needs to be dismantled after the concrete is hardened, the underground space is limited, the template is very inconvenient to transport, erect and dismantle, and the concrete is poured, more construction equipment needs to be arranged on the site, the construction space is further compressed, the construction difficulty is increased, the construction safety is reduced, meanwhile, the concrete pouring construction needs a long-time maintenance period, the construction efficiency can be reduced, and the construction period is prolonged. In addition, a part of the subway platform is installed and constructed by adopting common prefabricated components, and in order to meet the requirement of bearing design, the size and the weight of the section of the common component structure are often larger; if the large-volume member is manufactured, the difficulty of transportation and installation of the member is high in a narrow underground space; when small components are manufactured, the number of the components is excessive, and the number of finished installation seams is large, so that the structural integrity and stability are affected.
Disclosure of Invention
The invention aims to solve at least one of the technical problems in the prior art, provides an assembled subway platform and a construction method thereof, realizes convenient installation of the subway platform, and solves the problems of heavy weight and inconvenient installation of common components.
According to an embodiment of the first aspect of the present invention, there is provided a spliced subway platform, including:
the column components are vertically arranged and distributed in parallel at intervals;
a plurality of beam members horizontally disposed on the column members;
a plurality of platform plate members spliced to the beam body member;
the column body member, the beam body member and the platform plate member are all made of ultra-high performance concrete, and the compression strength, the breaking strength and the tensile strength of the ultra-high performance concrete are not lower than 150MPa, not lower than 20MPa and not lower than 7 MPa.
The spliced subway platform at least has the following beneficial effects: the subway platform is formed by splicing the column members, the beam members and the platform plate members, compared with the existing cast-in-place construction process, the installation of the subway platform is quicker and more convenient, and the problems of large occupied area, large construction difficulty, long construction period and the like of casting construction are solved; the column body member, the beam body member and the platform plate member are all prefabricated through the ultra-high performance concrete, the compressive strength of the ultra-high performance concrete is not lower than 150MPa, the bending strength is not lower than 20MPa, and the tensile strength is not lower than 7 MPa.
According to the assembled subway platform of the embodiment of the first aspect of the present invention, the ultra-high performance concrete comprises the following raw materials by mass: 55-65 parts of cement, 10-20 parts of silica fume, 90-100 parts of fine aggregate, 5-8 parts of quartz powder, 10-15 parts of reinforcing material, 1.5-2.0 parts of water reducing agent, 0.05-0.1 part of synergist and 10-13 parts of water, wherein the compressive strength grade of the cement is not lower than 42.5MPa, the reinforcing material is steel fiber, the water reducing rate of the water reducing agent is not lower than 25%, and the synergist is at least one of sodium tripolyphosphate and polynaphthalene sulfonate.
According to the assembled subway platform of the embodiment of the first aspect of the present invention, the column member is embedded with a vertical first connecting piece, one end of the first connecting piece is disposed in the column member, the other end of the first connecting piece extends to the beam member or the platform plate member, and the first connecting piece is used for connecting the beam member or the platform plate member.
According to the assembled subway platform of the first aspect of the present invention, the beam member is provided with a connection hole, at least a portion of the first connection member is inserted into the connection hole, and the connection hole has a diameter larger than that of the first connection member for pouring a connection material.
According to the assembled subway platform of the first aspect of the present invention, a connecting seam is provided between two adjacent platform plate members, the column member is disposed below the connecting seam, a reinforcing mesh is embedded inside the platform plate members, the reinforcing mesh extends to the connecting seam, the connecting hole penetrates through the beam member, the upper end of the first connecting member extends to the connecting seam, and the connecting seam is used for pouring connecting material, so that the column member, the beam member and the platform plate members are connected to form a whole.
According to the assembled subway platform of the first aspect of the present invention, the end of the platform plate member connected to the connecting seam is an inclined surface, so that the connecting seam is trapezoidal and has an upper end width larger than a lower end width, and the connecting hole is tapered and has an upper end aperture larger than a lower end aperture.
According to the assembled subway platform of the first aspect of the present invention, the upper end of the column member is provided with a positioning groove, and the positioning groove is matched with the bottom of the beam member for positioning and installing the beam member.
According to the assembled subway platform of the first aspect of the present invention, a film is disposed between the positioning grooves of the column member and the beam member to eliminate the installation gap between the positioning grooves and the column member.
The assembled subway platform comprises a base, wherein the upper end of the base is fixedly connected with the column member, and the lower end of the base is used for being connected with a foundation.
According to the assembled subway platform of the embodiment of the first aspect of the present invention, the column members are embedded with second connecting members, each second connecting member includes a vertical connecting portion and a horizontal connecting portion, an upper portion of each vertical connecting portion is disposed in the column member, the horizontal connecting portion is disposed at a bottom end of the corresponding vertical connecting portion, and a lower portion of each vertical connecting portion and the corresponding horizontal connecting portion are disposed in the corresponding base.
According to a second aspect of the present invention, there is provided a construction method of a spliced subway platform, including the following steps:
prefabricating a plurality of column body members, a plurality of beam body members and a plurality of platform plate members by using ultra-high performance concrete, wherein the compressive strength, the breaking strength and the tensile strength of the ultra-high performance concrete are not lower than 150MPa, not lower than 20MPa and not lower than 7 MPa;
the column members are mounted at intervals, the beam members are mounted on the column members, and the platform plate members are mounted on the beam members.
The construction method of the assembled subway platform at least has the following beneficial effects: the subway platform adopts an assembling construction mode, and is quicker and more convenient compared with the existing cast-in-place construction process; through the ultrahigh-performance concrete prefabricated column body component, the beam body component and the platform plate component, the compressive strength of the ultrahigh-performance concrete is not lower than 150MPa, the flexural strength is not lower than 20MPa, and the tensile strength is not lower than 7 MPa.
According to the construction method of the assembled subway platform in the embodiment of the second aspect of the invention, the ultra-high performance concrete comprises the following raw materials in parts by mass: 55-65 parts of cement, 10-20 parts of silica fume, 90-100 parts of fine aggregate, 5-8 parts of quartz powder, 10-15 parts of reinforcing material, 1.5-2.0 parts of water reducing agent, 0.05-0.1 part of synergist and 10-13 parts of water, wherein the compressive strength grade of the cement is not lower than 42.5MPa, the reinforcing material is steel fiber, the water reducing rate of the water reducing agent is not less than 25%, and the synergist is at least one of sodium tripolyphosphate and polynaphthalene sulfonate;
the step of prefabricating a plurality of column members, a plurality of beam members and a plurality of platform plate members through ultra high performance concrete includes:
mixing the cement, the silica fume, the reinforcing material and the quartz powder with sand in parts by mass, uniformly stirring, adding a mixture of the water reducing agent, the synergist and the water in parts by mass, and uniformly stirring to obtain a mixture of the ultrahigh-performance concrete;
injecting the mixture of the ultra-high performance concrete into the molds of the column body member, the beam body member and the platform plate member, standing for 5-7 h at room temperature, then placing the mixture into a curing chamber, introducing steam, raising the temperature at the speed of 12 ℃/h until the temperature reaches 35-45 ℃, curing for 20-30 h, taking out, and cooling at room temperature;
and removing the mould, putting the mould into a curing room, introducing steam, raising the temperature at the speed of 12 ℃/h until the temperature reaches 75-85 ℃, curing for 40-50 h, taking out, and cooling at room temperature to obtain the ultra-high performance concrete member.
According to the construction method of the assembled subway platform in the embodiment of the second aspect of the invention, the vertical first connecting piece is embedded in the column member, the connecting hole is formed in the beam member, and the reinforcing mesh is embedded in the platform plate member;
the step of mounting a beam member on the column member, the mounting the platform plate member on the beam member comprising:
mounting the beam body component to enable the connecting hole to be in inserting fit with the first connecting piece;
installing the platform plate members, wherein a connecting seam is formed between two adjacent platform plate members, the connecting seam is positioned above the column members, the first connecting piece penetrates through the connecting hole and extends to the connecting seam, and the reinforcing mesh extends to the connecting seam;
and pouring connecting materials into the connecting holes and the connecting seams to connect the column body component, the beam body component and the platform plate component into a whole.
According to the construction method of the assembled subway platform in the embodiment of the second aspect of the present invention, in the step, the connecting material is poured into the connecting holes and the connecting seams, a detection test piece is poured simultaneously when the connecting material is poured, the detection test piece is maintained under the same environmental condition as the connecting material, and when the strength of the detection test piece is detected to reach the predetermined strength or more, decoration construction work is performed on the installed platform plate member.
According to the construction method of the assembled subway platform, the column member is embedded with the second connecting piece, the second connecting piece comprises a vertical connecting part and a horizontal connecting part, the upper part of the vertical connecting part is arranged in the column member, and the horizontal connecting part is arranged at the bottom end of the vertical connecting part;
the step of installing the column member includes:
binding or welding the lower part of the second connecting piece with the reinforcing steel bars on the foundation together, and ensuring the height of each column member to be consistent;
installing a rectangular frame mold, wherein the rectangular frame mold surrounds the lower part of the second connecting piece;
and grouting and pouring into the rectangular frame mold, forming a base after maintenance, dismantling the rectangular frame mold, and connecting the foundation and the column member through the base.
Drawings
The invention is further described below with reference to the accompanying drawings and examples;
fig. 1 is a front view of a sectional type subway platform according to an embodiment of the present invention;
fig. 2 is a side view of a sectional type subway platform according to an embodiment of the present invention;
fig. 3 is a top view of the assembled subway platform of fig. 2 according to the embodiment of the present invention;
fig. 4 is an enlarged schematic structural view of a portion a of the assembled subway platform in fig. 1 according to the embodiment of the present invention;
FIG. 5 is a front view of a column member according to an embodiment of the present invention;
FIG. 6 is a side view of a cylindrical member according to an embodiment of the present invention;
FIG. 7 is a top view of a cylindrical member according to an embodiment of the present invention;
FIG. 8 is a front view of a beam body member according to an embodiment of the present invention;
FIG. 9 is a side view of a beam body member according to an embodiment of the present invention;
fig. 10 is a top view of a platform plate member according to an embodiment of the present invention;
fig. 11 is a front view of a platform plate member according to an embodiment of the present invention;
reference numerals: the structure comprises a column member 100, a first connector 110, a positioning groove 120, a second connector 130, a vertical connector 131, a horizontal connector 132, a beam member 200, a connecting hole 210, a reinforcing steel bar 220, a platform plate member 300, a connecting seam 310, a reinforcing mesh 320, a base 400, a reinforcing steel bar 500, a side wall foundation 600 and a foundation 700.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 to 11, an embodiment of the present invention provides an assembled subway platform, including a plurality of column members 100, a plurality of beam members 200, and a plurality of platform members 300, wherein the column members 100 are vertically disposed, and the plurality of column members 100 are spaced apart and distributed in parallel; the beam body members 200 are horizontally arranged on the column body members 100, and a plurality of beam body members 200 are connected end to end and form a frame with the main body member to support the station board member 300; a plurality of station plate members 300 are spliced on the beam body member 200; the column member 100, the beam body member 200 and the platform plate member 300 are all made of ultra-high performance concrete, and the compression strength, the bending strength and the tensile strength of the ultra-high performance concrete are not lower than 150MPa, not lower than 20MPa and not lower than 7 MPa.
The assembled subway platform of the embodiment is formed by assembling the column member 100, the beam member 200 and the platform plate member 300, compared with the existing cast-in-place construction process, the installation of the subway platform is faster and more convenient, and the problems of large occupied area, large construction difficulty, long construction period and the like of casting construction are solved; the column body member 100, the beam body member 200 and the platform plate member 300 are all formed by prefabricating ultrahigh-performance concrete, the compressive strength of the ultrahigh-performance concrete is not lower than 150MPa, the bending strength is not lower than 20MPa, and the tensile strength is not lower than 7 MPa.
In this embodiment, the ultra-high performance concrete comprises the following raw materials in parts by mass: 55-65 parts of cement, 10-20 parts of silica fume, 90-100 parts of fine aggregate, 5-8 parts of quartz powder, 10-15 parts of reinforcing material, 1.5-2.0 parts of water reducing agent, 0.05-0.1 part of synergist and 10-13 parts of water, wherein the cement is more specifically ordinary portland cement or portland cement with the compressive strength grade not lower than 42.5 MPa; the silica fume is 95-grade undisturbed silica micropowder, the content of silica is more than 85 percent, and the balance of a 45-micron sieve is less than 2 percent; the fine aggregate can be artificial sand or natural sand with the particle size of 0.1-4.75 mm; the mesh number of the quartz powder is 300-500 meshes; the reinforcing material is single steel fiber or mixed steel fiber with various specifications, the diameter of the reinforcing material is (0.2 +/-0.02) mm, and the length of the reinforcing material is 12-20 mm; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is not less than 25%; the synergist is at least one of sodium tripolyphosphate and polynaphthalene sulfonate. The ultra-high performance concrete of the embodiment is prepared by mixing the raw materials according to the proportion, and has the compressive strength of not less than 150MPa, the flexural strength of not less than 20MPa and the tensile strength of not less than 7 MPa.
The assembly construction of the subway platform needs to ensure firm connection among all components.
In some embodiments, the column member 100 has the first connecting member 110 embedded therein, the first connecting member 110 has a vertical rod shape, the lower end of the first connecting member 110 is disposed in the column member 100, the upper end of the first connecting member 110 extends to the platform plate member 300, and the beam member 200 and the platform plate member 300 are connected by the first connecting member 110, such that the column member 100, the beam member 200, and the platform plate member 300 are integrated. The column member 100 can be a rectangular section column with the side length not less than 150mm or a circular section column with the diameter not less than 150mm, and the height of the column member 100 is determined according to the engineering design requirement; the strength grade of the first connecting piece 110 is not lower than 400MPa, the diameter is not less than 12mm, the depth embedded in the column member 100 is not less than 350mm, and the length of the exposed part is not less than 100 mm.
Specifically, the beam member 200 is provided with a plurality of coupling holes 210 spaced apart in a length direction, at least a portion of the first coupling member 110 is inserted into the coupling holes 210, and the coupling holes 210 have a diameter larger than that of the first coupling member 110, so that a coupling material is poured to integrally couple the column member 100 and the beam member 200.
Referring to fig. 1 and 4, further, a connection gap 310 is formed between two adjacent platform deck members 300, the column members 100 are disposed below the connection gap 310, a reinforcing mesh 320 is pre-embedded in the platform deck members 300, the reinforcing mesh 320 extends to the outside of the connection gap 310, and the connection holes 210 penetrate through the girder member 200, so that the upper end of the first connection member 110 can extend to the connection gap 310; the connection joints 310 are poured with connection materials, which are simultaneously poured into the connection holes 210 along the connection joints 310, thereby integrally connecting the column member 100, the girder member 200, and the platform plate member 300. Specifically, the connecting material is a wet connecting material.
The gap between the two platform plate members 300 is reserved to form a connecting seam 310, the first connecting member 110 pre-embedded in the column member 100 passes through the connecting hole 210 penetrating through the beam body member 200 and extends to the connecting seam 310, and the two ends of the reinforcing mesh 320 in the platform plate member 300 extend to the connecting seam 310, so that the three members can be connected into a whole at the same time by pouring connecting materials into the connecting hole 210 and the connecting seam 310.
The mesh reinforcement 320 plays a role in reinforcing the structural strength of the station deck member 300, and simultaneously extends to the connecting joints 310 to play a role in connection, the main tension bars of the mesh reinforcement 320 are located below the middle height of the station deck member 300, the thickness of the station deck member 300 can be set to be 40-60 mm, the strength grade of the bars of the mesh reinforcement 320 is not lower than 400MPa, the diameter is not smaller than 8mm, the thickness of the protective layer of the bars is not smaller than 15mm, the length of the bars extending to the connecting joints 310 is 30-40 mm, the plane size of the station deck member 300 is determined according to the design requirement and the convenience of transportation and installation, and the maximum span is not larger than 3000 mm.
In some embodiments, the ends of the platform plate 300 that meet the connecting seam 310 are sloped such that the connecting seam 310 is trapezoidal and has a greater width at the upper end than at the lower end, and the connecting hole 210 is tapered and has a greater diameter at the upper end than at the lower end, thereby facilitating the pouring of the connecting material and making the connection between the three members more secure.
It will be appreciated that the column member 100 connects the beam body member 200 and the platform plate member 300 by the first connecting member 110 and pouring the connecting material at the connecting seam 310. alternatively, the first connecting member 110 may be provided to connect only the beam body member 200, the upper end of the first connecting member 110 extends to the beam body member 200, a portion of the first connecting member 110 is inserted into the connecting hole 210 to achieve the connection of the column member 100 and the beam body member 200, and the connection between the beam body member 200 and the platform plate member 300 is connected by other structures.
Referring to fig. 5 to 9, in some embodiments, the upper end of the cylinder member 100 is provided with a positioning groove 120, and the positioning groove 120 is matched with the bottom of the beam member 200 for positioning the beam member 200. Specifically, the beam member 200 and the positioning groove 120 each have a trapezoidal cross section, and the beam member 200 has an upper end width greater than a lower end width and the positioning groove 120 has an upper end width greater than a bottom end width, so that the beam member 200 is mounted. The upper section width of the beam body member 200 is not less than 150mm, the lower section width can be set to 100mm, the upper and lower diameters of the connecting hole 210 are respectively 30mm and 20mm, reinforcing steel bars 220 are arranged on two sides of the connecting hole 210 to improve the structural strength of the beam body member 200, the reinforcing steel bars 220 are located below the middle height of the platform plate member 300, and the strength grade of the reinforcing steel bars is not lower than 400 MPa.
It will be appreciated that the beam member 200 and the positioning slot 120 may alternatively be configured to have a rectangular cross-section.
Further, a film is disposed between the positioning groove 120 of the column member 100 and the beam member 200 to eliminate the installation gap between the positioning groove 120 and the column member 100, so that the connection between the two is more stable. Specifically, the material of the film may be rubber.
Referring to fig. 1 and 2, in some embodiments, the sectional type subway platform includes a base 400, the upper end of the base 400 is fixedly connected to the column member 100, and the lower end of the base 400 is used to be connected to a foundation 700.
Further, the second connecting member 130 is embedded in the column member 100, the second connecting member 130 includes a vertical connecting portion 131 and a horizontal connecting portion 132, an upper portion of the vertical connecting portion 131 is disposed in the column member 100, the horizontal connecting portion 132 is disposed at a bottom end of the vertical connecting portion 131, a lower portion of the vertical connecting portion 131 and the horizontal connecting portion 132 are disposed in the base 400, and the vertical connecting portion 131 and the horizontal connecting portion 132 can bear loads in a vertical direction and a horizontal direction, so that the column member 100 and the base 400 can be reliably connected.
The embodiment of the invention also provides a construction method of the assembled subway platform, which realizes the construction of the assembled subway platform and comprises the following steps:
s100, prefabricating a plurality of column body members 100, a plurality of beam body members 200 and a plurality of station plate members 300 through ultra-high performance concrete, wherein the compressive strength, the breaking strength and the tensile strength of the ultra-high performance concrete are not lower than 150MPa, not lower than 20MPa and not lower than 7 MPa.
Specifically, step S100 includes steps S110, S120, S130.
S110, mixing the cement, the silica fume, the reinforcing material, the quartz powder and the sand in parts by mass, uniformly stirring, adding the mixture of the water reducing agent, the synergist and the water in parts by mass, and uniformly stirring to obtain a mixture of the ultra-high performance concrete;
s120, injecting the mixture of the ultra-high performance concrete into the molds of the column body member 100, the beam body member 200 and the platform plate member 300, standing for 5-7 h at room temperature, then placing the mixture into a curing room, introducing steam, raising the temperature at the speed of 12 ℃/h until the temperature reaches 35-45 ℃, curing for 20-30 h, taking out, and cooling at room temperature;
s130, removing the mould, putting the mould into a curing room, introducing steam, raising the temperature at the speed of 12 ℃/h until the temperature reaches 75-85 ℃, curing for 40-50 h, taking out, and cooling at room temperature to obtain the ultra-high performance concrete member.
And mixing the raw materials in parts by mass to obtain a concrete mixture, and curing the concrete mixture by steam and at different times and temperatures to finally obtain the ultrahigh-performance concrete meeting the requirements.
And S200, mounting the column members 100 at intervals.
Specifically, step S200 includes steps S210, S220, S230.
And S210, binding or welding the lower part of the second link 130 of each column member 100 with the reinforcing bars 500 of the foundation 700, and ensuring the height of each column member 100 to be uniform. Wherein, if no reinforcement 500 is reserved on the foundation 700 for installing the column member 100, reinforcement needs to be planted on the foundation 700 at the corresponding position, the specification, model and burial depth of the reinforcement-planted reinforcement should be determined according to the design requirement, and meets the relevant standard requirements, after the bar planting is finished and the strength meets the requirements, the column body component 100 is placed on the corresponding position, and the second connecting member 130 of the column member 100 is connected with the reinforcing bars 500 on the foundation 700, before the second connecting member 130 of the column member 100 is connected with the reinforcing bars 500 on the foundation 700, the position and elevation of the column member 100 must be detected and adjusted, and welding or binding can be performed after qualification, to ensure the accuracy of the mounting and positioning of the members, the distance between two adjacent column members 100 is approximately the length of the station plate member 300, so that the connecting seam 310 between two adjacent station plate members 300 is positioned above the column members 100.
S220, installing a rectangular frame mold, wherein the rectangular frame mold can adopt rectangular frame molds with the length, width and height respectively smaller than 400mm, 400mm and 200mm, the rectangular frame mold surrounds the lower part of the second connecting piece 130 and the upper part of the steel bar on the foundation 700, no gap is required to be formed between the mold and the foundation 700, and otherwise, sealing treatment is carried out by adopting sealant or other means;
and S230, grouting and pouring into the rectangular frame mold, forming a base 400 after curing, removing the rectangular frame mold, and connecting the foundation 700 and the column member 100 through the base 400. In the pouring process, the position and the elevation of the column member 100 are monitored, the deviation is controlled within 3mm, the position and the elevation which do not meet the requirements can be adjusted in time, the installation precision of the column member 100 after the base 400 is hardened can meet the requirements, and the pouring material is micro-expansion grouting material with the strength of more than 80MPa in 28 days.
S300, mounting the beam member 200 on the column member 100, wherein the beam member 200 is placed on the positioning groove 120 at the upper end of the column member 100 during mounting, a flexible sheet is placed between the beam member 200 and the column member 100, the first connecting piece 110 of the column member 100 penetrates through the connecting hole 210 in the beam member 200, and the first connecting piece 110 is in inserted fit with the connecting hole 210; one end of the beam member 200 is lapped on the sidewall base 600.
S400, the platform plate member 300 is installed on the beam body member 200.
Specifically, step S400 includes steps S410, S420.
S410, erecting the platform plate members 300 on the beam body member 200, wherein the overlapping width of each mounting edge of the platform plate member 300 and the beam body member 200 is not less than 50mm, the connecting seam 310 between two adjacent platform plate members 300 is located above the column member 100, the first connecting member 110 passes through the connecting hole 210 and extends to the connecting seam 310, and both ends of the mesh reinforcement 320 inside the platform plate member 300 extend to the connecting seam 310;
and S420, pouring connecting materials into the connecting holes 210 and the connecting seams 310, so that the column member 100, the beam body member 200 and the platform plate member 300 are connected into a whole, and the connection among the members is realized. Specifically, the connecting material is a wet connecting material, the 28-day compressive strength of the wet connecting material is not lower than 120Mpa, the 28-day tensile strength of the wet connecting material is not lower than 8Mpa, the dry shrinkage rate is less than 0.02%, and the working performance requirement during pouring is that the slump expansion degree is not less than 600 mm; when pouring is carried out, the material is full, the surface is smooth, and after pouring is finished, the film is covered in time for moisture preservation and maintenance.
Further, when the connection material is poured into the connection hole 210 and the connection joint 310, a test piece is poured at the same time, the test piece is cured under the same environmental condition as the connection material, and when the strength of the test piece reaches a predetermined strength or more, decoration construction work can be performed on the installed station deck member 300. Specifically, the predetermined strength is 80Mpa, and since the test piece is the same as the maintenance environmental conditions of the connecting materials in the connecting hole 210 and the connecting seam 310, when the strength of the test piece reaches more than 80Mpa, it is shown that the connecting materials in the connecting hole 210 and the connecting seam 310 also reach the required strength, and then the next step of work can be performed, so that the construction safety is ensured. By adopting the detection test piece, the connecting materials in the connecting holes 210 and the connecting seams 310 do not need to be directly detected, and the construction operation is convenient. Similarly, an inspection piece may be provided when the base 400 is poured in S230.
According to the construction method of the assembled subway platform, the subway platform is assembled, and compared with the existing cast-in-place construction process, the construction method is quicker and more convenient. Through the prefabricated column body component 100, the beam body component 200 and the platform plate component 300 of the ultra-high performance concrete, the compressive strength of the ultra-high performance concrete is not lower than 150MPa, the flexural strength is not lower than 20MPa, and the tensile strength is not lower than 7 MPa. In addition, the structural integration is realized among the three members through the first connecting member 110 on the column member 100, the connecting hole 210 on the beam body member 200, the reinforcing mesh 320 on the platform plate member 300, the connecting seam 310 between two adjacent platform plate members 300, and the pouring of wet connecting materials.
It can be understood that the connection between the three members of the present embodiment is mainly the connection in the length direction, and referring to fig. 1, the connection seam 310 is provided between two platform plate members 300 adjacent to each other in the length direction, so that the three members can be connected into a whole; while two adjacent station plate members 300 in the width direction are in close contact without providing the connecting seam 310, refer to fig. 2; of course, if desired, a connecting seam 310 may also be provided between two platform deck members 300 adjacent in the width direction to further enhance the structural strength of the member connection.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (15)
1. An assembled subway platform, comprising:
the column components are vertically arranged and distributed in parallel at intervals;
a plurality of beam members horizontally disposed on the column members; and
a plurality of platform plate members spliced to the beam body member;
the column body member, the beam body member and the platform plate member are all made of ultra-high performance concrete, and the compression strength, the breaking strength and the tensile strength of the ultra-high performance concrete are not lower than 150MPa, not lower than 20MPa and not lower than 7 MPa.
2. The assembled subway platform as claimed in claim 1, wherein said ultra-high performance concrete comprises the following raw materials in parts by mass: 55-65 parts of cement, 10-20 parts of silica fume, 90-100 parts of fine aggregate, 5-8 parts of quartz powder, 10-15 parts of reinforcing material, 1.5-2.0 parts of water reducing agent, 0.05-0.1 part of synergist and 10-13 parts of water, wherein the compressive strength grade of the cement is not lower than 42.5MPa, the reinforcing material is steel fiber, the water reducing rate of the water reducing agent is not lower than 25%, and the synergist is at least one of sodium tripolyphosphate and polynaphthalene sulfonate.
3. The modular subway platform of claim 1, wherein: the vertical first connecting piece is embedded in the column member, one end of the first connecting piece is arranged in the column member, the other end of the first connecting piece extends to the beam body member or the platform plate member, and the first connecting piece is used for connecting the beam body member or the first connecting piece is used for connecting the beam body member and the platform plate member.
4. The modular subway platform of claim 3, wherein: the beam body member is provided with a connecting hole, at least one part of the first connecting piece is inserted into the connecting hole, and the diameter of the connecting hole is larger than that of the first connecting piece and used for pouring connecting materials.
5. The modular subway platform of claim 4, wherein: a connecting seam is arranged between two adjacent platform plate members, the column body member is arranged below the connecting seam, a reinforcing mesh is embedded in the platform plate members, the reinforcing mesh extends to the connecting seam, the connecting hole penetrates through the beam body member, the upper end of the first connecting piece extends to the connecting seam, and the connecting seam is used for pouring connecting materials, so that the column body member, the beam body member and the platform plate member are connected into a whole.
6. The modular subway platform of claim 5, wherein: the end part of the platform plate component connected with the connecting seam is an inclined plane, so that the connecting seam is trapezoidal, the width of the upper end of the connecting seam is larger than that of the lower end of the connecting seam, the connecting hole is conical, and the aperture of the upper end of the connecting hole is larger than that of the lower end of the connecting hole.
7. The modular subway platform of claim 1, wherein: the upper end of cylinder component is equipped with the constant head tank, the constant head tank with the bottom of roof beam body component matches for the location installation the roof beam body component.
8. The modular subway platform of claim 7, wherein: and a soft sheet is arranged between the column component and the positioning groove of the beam component and is used for eliminating the installation gap between the positioning groove and the column component.
9. The modular subway platform according to any one of claims 1 to 8, wherein: the spliced subway platform comprises a base, wherein the upper end of the base is fixedly connected with the column member, and the lower end of the base is used for being connected with a foundation.
10. The modular subway platform of claim 9, wherein: the column body component is embedded with a second connecting piece, the second connecting piece comprises a vertical connecting part and a horizontal connecting part, the upper part of the vertical connecting part is arranged in the column body component, the horizontal connecting part is arranged at the bottom end of the vertical connecting part, and the lower part of the vertical connecting part and the horizontal connecting part are arranged in the base.
11. A construction method of an assembled subway platform is characterized by comprising the following steps:
prefabricating a plurality of column body members, a plurality of beam body members and a plurality of platform plate members by using ultra-high performance concrete, wherein the compressive strength, the breaking strength and the tensile strength of the ultra-high performance concrete are not lower than 150MPa, not lower than 20MPa and not lower than 7 MPa;
the column members are mounted at intervals, the beam members are mounted on the column members, and the platform plate members are mounted on the beam members.
12. The construction method of the assembled subway platform as claimed in claim 11, wherein said ultra-high performance concrete comprises the following raw materials in parts by mass: 55-65 parts of cement, 10-20 parts of silica fume, 90-100 parts of fine aggregate, 5-8 parts of quartz powder, 10-15 parts of reinforcing material, 1.5-2.0 parts of water reducing agent, 0.05-0.1 part of synergist and 10-13 parts of water, wherein the compressive strength grade of the cement is not lower than 42.5MPa, the reinforcing material is steel fiber, the water reducing rate of the water reducing agent is not less than 25%, and the synergist is at least one of sodium tripolyphosphate and polynaphthalene sulfonate;
the step of prefabricating a plurality of column members, a plurality of beam members and a plurality of platform plate members through ultra high performance concrete includes:
mixing the cement, the silica fume, the reinforcing material and the quartz powder with sand in parts by mass, uniformly stirring, adding a mixture of the water reducing agent, the synergist and the water in parts by mass, and uniformly stirring to obtain a mixture of the ultrahigh-performance concrete;
injecting the mixture of the ultra-high performance concrete into the molds of the column body member, the beam body member and the platform plate member, standing for 5-7 h at room temperature, then placing the mixture into a curing chamber, introducing steam, raising the temperature at the speed of 12 ℃/h until the temperature reaches 35-45 ℃, curing for 20-30 h, taking out, and cooling at room temperature;
and removing the mould, putting the mould into a curing room, introducing steam, raising the temperature at the speed of 12 ℃/h until the temperature reaches 75-85 ℃, curing for 40-50 h, taking out, and cooling at room temperature to obtain the ultra-high performance concrete member.
13. The construction method of the assembled subway platform as claimed in claim 11 or 12, wherein: a vertical first connecting piece is embedded in the column body component, a connecting hole is formed in the beam body component, and a reinforcing mesh is embedded in the platform plate component;
the step of mounting a beam member on the column member, the mounting the platform plate member on the beam member comprising:
mounting the beam body component to enable the connecting hole to be in inserting fit with the first connecting piece;
installing the platform plate members, wherein a connecting seam is formed between two adjacent platform plate members, the connecting seam is positioned above the column members, the first connecting piece penetrates through the connecting hole and extends to the connecting seam, and the reinforcing mesh extends to the connecting seam;
and pouring connecting materials into the connecting holes and the connecting seams to connect the column body component, the beam body component and the platform plate component into a whole.
14. The construction method of the assembled subway platform as claimed in claim 13, wherein: pouring connecting materials into the connecting holes and the connecting seams, pouring a detection test piece when the connecting materials are poured, maintaining the detection test piece under the same environmental condition with the connecting materials, and carrying out decoration construction on the installed station bedplate component after the strength of the detection test piece reaches above the preset strength.
15. The construction method of the assembled subway platform as claimed in claim 11 or 12, wherein: a second connecting piece is pre-embedded in the column body component and comprises a vertical connecting part and a horizontal connecting part, the upper part of the vertical connecting part is arranged in the column body component, and the horizontal connecting part is arranged at the bottom end of the vertical connecting part;
the step of installing the column member includes:
binding or welding the lower part of the second connecting piece with the reinforcing steel bars on the foundation together, and ensuring the height of each column member to be consistent;
installing a rectangular frame mold, wherein the rectangular frame mold surrounds the lower part of the second connecting piece;
and grouting and pouring into the rectangular frame mold, forming a base after maintenance, dismantling the rectangular frame mold, and connecting the foundation and the column member through the base.
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