CN110042862B - Subway station prefabricated rail top air duct, connection node with prefabricated middle plate and construction method - Google Patents
Subway station prefabricated rail top air duct, connection node with prefabricated middle plate and construction method Download PDFInfo
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- CN110042862B CN110042862B CN201910355831.3A CN201910355831A CN110042862B CN 110042862 B CN110042862 B CN 110042862B CN 201910355831 A CN201910355831 A CN 201910355831A CN 110042862 B CN110042862 B CN 110042862B
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- 238000010276 construction Methods 0.000 title claims abstract description 62
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 168
- 239000010959 steel Substances 0.000 claims abstract description 168
- 230000000149 penetrating effect Effects 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 238000009417 prefabrication Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000003566 sealing material Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 39
- 238000011065 in-situ storage Methods 0.000 description 26
- 239000004567 concrete Substances 0.000 description 23
- 239000002131 composite material Substances 0.000 description 17
- 238000009434 installation Methods 0.000 description 13
- 210000001503 joint Anatomy 0.000 description 12
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 5
- 239000002689 soil Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000004575 stone Substances 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000005465 channeling Effects 0.000 description 2
- 239000004035 construction material Substances 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012946 outsourcing Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 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
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/66—Sealings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F17/00—Vertical ducts; Channels, e.g. for drainage
- E04F17/04—Air-ducts or air channels
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Abstract
The invention discloses a prefabricated rail top air duct of a subway station, wherein: the prefabricated rail top air channel comprises a rail top air channel left side wall, a rail top air channel right side wall, a rail top air channel bottom plate, inverted U-shaped steel bars, longitudinal perforations and longitudinal locking steel bars; the rail top air duct left side wall, the rail top air duct right side wall and the rail top air duct bottom plate form a groove-shaped structure; the upper parts of the left side wall of the rail top air channel and the right side wall of the rail top air channel are longitudinally pre-embedded with a plurality of inverted U-shaped steel bars, the upper parts of the inverted U-shaped steel bars extend out of the top of the side wall to form a closed loop, and the inverted U-shaped steel bars are used for penetrating pins to pick up the inverted U-shaped steel bars and are integrally embedded into prefabricated hole slots of a prefabricated middle plate of a subway station to be poured into a whole; longitudinal perforations are formed in the left side wall of the rail top air channel and the right side wall of the rail top air channel and below the inverted U-shaped steel bars in a longitudinal penetrating manner and are used for penetrating the longitudinal locking steel bars, so that two adjacent prefabricated rail top air channels are fixed. The invention solves the problem of difficult construction of the rail top air duct of the subway station, and has the advantages of simplicity, convenience and high construction speed.
Description
Technical Field
The invention belongs to the field of underground engineering of subway stations, and particularly relates to a connection node structure of a prefabricated rail top air channel of a subway station, the prefabricated rail top air channel of the subway station and a prefabricated middle plate.
Background
In the construction process of the subway station, the existing rail top air duct has two modes of cast-in-situ and prefabrication, but the existing scheme has respective defects.
The construction problems of the cast-in-situ rail roof air duct include:
(1) The rail top air channel is positioned below the middle plate of the subway station, and above the rail, is a station secondary structure and needs later construction due to factors such as shield construction. When the later construction of the rail top air duct is carried out, the scaffold for erecting the middle plate is removed, and the scaffold and the template are required to be erected again, so that the time and the labor are wasted and the cost is high.
(2) The rail top air duct is suspended below the middle plate by utilizing the reserved steel bars of the middle plate, the space of the rail top air duct is narrow, the steel bars are bound, concrete is poured and the like, the construction quality is difficult to ensure, and water leakage and hidden danger of quality are ubiquitous.
The problems of prefabricated rail top wind channel construction include:
(1) Corrosion protection problem: the prefabricated rail top air duct is connected with the subway middle plate by adopting steel nodes such as anchor bolts, section steel or welding and the like,
the subway engineering is general in water leakage, the corrosion prevention problem is outstanding in a humid environment, the steel structure node has larger potential safety hazard, regular maintenance is needed, and the investment is increased.
(2) Fire protection problem: the prefabricated rail top air duct is connected with the subway middle plate by adopting steel nodes such as anchor bolts, section steel or welding and the like,
the steel nodes also have fireproof problems, and potential safety hazards cannot be ignored.
(3) If the prefabricated rail top air duct is connected with the middle plate in a mode of reserved steel bar cast-in-situ and the like, the construction difficulty is high, the construction quality is difficult to guarantee, and great potential safety hazards exist. The subway is a century engineering, and especially the railway running area is safe, the connection quality requirement is high, and the subway must be ensured to be free of any loss.
(4) The weight of the prefabricated rail top air duct is ten tons, and the conventional construction difficulty is high.
Disclosure of Invention
The problems of corrosion prevention and fire prevention of the connecting nodes, the construction quality and stress of the connecting nodes and the assembled construction of the rail top air duct of the subway station are key problems to be solved. Aiming at least one of the defects or the improvement demands of the prior art, the invention provides a prefabricated rail top air channel and a node structure of a subway station, solves the problem of difficult construction of the rail top air channel of the subway station, and is simple and convenient and high in construction speed; the durability is good, the integrity is good, the quality is high, and the safety and the reliability are realized; the construction period is saved, and the investment is saved; the mechanical assembly type construction is environment-friendly, energy-saving and low-carbon, and can be widely applied to cast-in-situ subway stations and assembly type subway stations, and has wide market prospect.
To achieve the above object, according to one aspect of the present invention, there is provided a subway station pre-fabricated rail roof wind tunnel, wherein: the prefabricated rail top air channel comprises a rail top air channel left side wall, a rail top air channel right side wall, a rail top air channel bottom plate, inverted U-shaped steel bars, longitudinal perforations and longitudinal locking steel bars;
the rail top air duct left side wall, the rail top air duct right side wall and the rail top air duct bottom plate form a groove-shaped structure; the upper parts of the left side wall of the rail top air channel and the right side wall of the rail top air channel are longitudinally pre-embedded with a plurality of inverted U-shaped steel bars, the upper parts of the inverted U-shaped steel bars extend out of the top of the side wall to form a closed loop, and the inverted U-shaped steel bars are used for penetrating pins to pick up the inverted U-shaped steel bars and are integrally embedded into prefabricated hole slots of a prefabricated middle plate of a subway station to be poured into a whole;
the left side wall of the rail top air channel and the right side wall of the rail top air channel are internally provided with longitudinal perforations which are longitudinally penetrated below the inverted U-shaped reinforcing steel bars and used for penetrating the longitudinal locking reinforcing steel bars so as to fix two adjacent prefabricated rail top air channels.
Preferably, the prefabricated rail top air duct further comprises an operation hand hole and a steel sleeve;
the end parts of the longitudinal locking steel bars of each prefabricated rail top air duct are fixedly connected with the end parts of the longitudinal locking steel bars of the adjacent prefabricated rail top air ducts through the steel sleeves;
the operation hand hole is a hole groove which is formed at two ends of the longitudinal perforation and is partially enlarged and is opened to the lateral outer side of the side wall, an operation space is provided for the fastening connection of the steel sleeve, and the steel sleeve can be filled and sealed.
Preferably, the prefabricated rail top air duct further comprises an elastic sealing gasket;
elastic sealing gaskets are uniformly distributed at the joint of the prefabricated rail top air duct and the prefabricated middle plate of the subway station and the joint of the adjacent rail top air duct to seal the rail top air duct;
elastic sealing gaskets at joints of the prefabricated rail top air channel and the prefabricated middle plate of the subway station are arranged at the tops of the left side wall of the rail top air channel and the right side wall of the rail top air channel and at the lateral sides of the inverted U-shaped steel bars;
the elastic sealing gasket at the joint of the adjacent rail top air duct is arranged along the groove shape of the rail top air duct.
In order to achieve the above object, according to another aspect of the present invention, there is also provided a connection node structure of a prefabricated rail roof wind tunnel and a prefabricated middle plate of a subway station, wherein: the prefabricated middle plate comprises the prefabricated rail top air channel of the subway station and the prefabricated middle plate of the subway station;
a plurality of special T-shaped steel sleeves are embedded in the prefabricated middle plate and are vertically communicated in the plate thickness direction; two specially-made T-shaped steel sleeves form a pair of inverted U-shaped steel bars which are transversely arranged and respectively extend out of the tops of the left side wall of the rail top air duct and the right side wall of the rail top air duct for insertion;
the special T-shaped steel sleeve is in a T shape formed by an upper part and a lower part, and the pin is clamped at the upper part of the T shape.
Preferably, the upper part of the special T-shaped steel sleeve is a horizontal sleeve, the lower part of the special T-shaped steel sleeve is a vertical sleeve, and an upper middle plate groove and a lower middle plate vertical hole are respectively formed in the factory prefabrication pouring process of the prefabricating middle plate;
the inverted U-shaped steel bar passes through the vertical hole of the middle plate and extends into the groove of the middle plate; the pin is arranged in the middle plate groove, penetrates through the upper closed loop of the inverted U-shaped steel bar, spans the two ends of the vertical hole of the middle plate and lifts up and supports the inverted U-shaped steel bar;
filling materials are poured into the middle plate grooves and the middle plate vertical holes, and the prefabricated rail top air duct and the prefabricated middle plate are connected into a whole.
Preferably, the connecting node structure further comprises a positioning steel bar;
the special T-shaped steel sleeves are sequentially arranged along the longitudinal direction of the subway station, and the special T-shaped steel sleeves of each pair are fixed into an integral frame through the positioning steel bars and are buried into pouring materials of the prefabricated middle plate.
Preferably, the pin is wedge-shaped and is used for adjusting the elevation of the prefabricated rail top air duct to be attached to the prefabricated middle plate.
Preferably, the joints of the air duct joints of the adjacent prefabricated rail tops adopt the joint of the tenons and tenons grooves with reserved middle holes, and a grouting pipe is arranged on the joint of the tenons and tenons grooves.
In order to achieve the above object, according to another aspect of the present invention, there is also provided a construction method of a connection node structure of a prefabricated rail top air duct and a prefabricated middle plate of a subway station as described above, including the steps of:
s1, manufacturing a prefabricated rail top air channel in a factory, and embedding a plurality of inverted steel bars at the upper parts of side walls at two ends of the prefabricated rail top air channel; manufacturing a specially-manufactured T-shaped steel sleeve by factory processing;
s2, pre-burying a special T-shaped steel sleeve manufactured by a factory before binding middle plate steel bars in construction; when the middle plate is poured, a special T-shaped steel sleeve is used for forming a middle plate groove at the upper part and a middle plate vertical hole at the lower part on the middle plate, so that a prefabricated middle plate is manufactured;
s3, hoisting the prefabricated middle plate in place in the construction of the subway station, and jacking the prefabricated rail top air channel to a preset position after the prefabricated rail top air channel is transported to the site;
s4, jacking the prefabricated rail top air channel to the lower part of the prefabricated middle plate, so that the inverted U-shaped steel bar is inserted into the vertical hole of the middle plate and extends out of the middle plate groove;
s5, driving pins into the reserved middle plate grooves to enable the pins to penetrate through the inverted U-shaped steel bars, enabling two ends of each pin to be lapped on two sides of a vertical hole of the middle plate to form a shoulder pole shape, lifting the inverted U-shaped steel bars, and accordingly fixing the prefabricated rail top air duct;
s6, penetrating longitudinal locking steel bars with threads at two ends into longitudinal perforations reserved in the left side wall and the right side wall of the prefabricated rail top air duct, so that the newly installed prefabricated rail top air duct is fixed with the previous prefabricated rail top air duct;
s7, repeating the steps S3-S6 until all the prefabricated rail top air channels are installed, and fastening;
and S8, after the rail top air duct is assembled, finally, pouring a sealing material in the specially-made T-shaped steel sleeve to enable the prefabricated middle plate and the prefabricated rail top air duct to form a whole.
Preferably, after the step S5 is completed, at the moment, the prefabricated rail top air duct is tightly attached to the prefabricated middle plate, and the sealing between the prefabricated rail top air duct and the prefabricated middle plate is realized through the elastic sealing gaskets preset at the tops of the left side wall of the rail top air duct and the right side wall of the rail top air duct;
after S8, further comprising:
s9, filling materials are injected into the grouting pipe pre-buried at the joint of the two prefabricated rail top air channels, gaps are filled, and tightness is guaranteed.
The above-described preferred technical features may be combined with each other as long as they do not collide with each other.
In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:
(1) Construction is convenient, and construction speed is fast: the prefabricated air duct pipe joints are jacked to the preset positions through the installation trolley, the prefabricated air duct pipe joints are assembled section by section, the pins are positioned, the mechanical assembly type construction is convenient, the limitations that the construction of the conventional cast-in-situ rail roof air duct and the prefabricated rail roof air duct is difficult and the construction difficulty is high can be overcome, and the prefabricated air duct pipe joint can be widely popularized and applied in underground stations.
(2) Good durability and high quality: after the inverted U-shaped steel bars and the pins for fixing the prefabricated air duct are inserted into the fixed positions, fine stone concrete is backfilled, the whole inverted U-shaped steel bars and the pin parts are wrapped in the concrete, and the concrete is corrosion-resistant and fire-resistant, has high quality and can meet the requirements of century engineering durability. The invention solves the problems of durability and stress of the connecting node of the air duct at the top of the common prefabricated rail, and eliminates the potential safety hazard of corrosion and ignition of the connecting node.
(3) The integrity is good, and the wind channeling and the wind leakage are avoided: in the implementation process of the invention, the elastic sealing gasket is arranged at the joint of each section of prefabricated rail top air channel, the stress application fastening can be realized immediately after the assembly is completed, the joint is grouting sealed, the integrity of the rail top air channel is good, and the air leakage of the channeling are avoided.
(4) The construction period is saved: the prefabricated rail top air duct mechanical construction method is free of concrete equal-strength time, high in assembly construction speed and capable of saving construction period.
(5) Investment is saved: the prefabricated rail top air duct and the mechanized construction method do not need a scaffold and a template project, and the structure size is reduced by adopting high-strength concrete, so that the investment is saved.
(6) Prefabricated rail top air duct assembly type mechanical construction, dry operation, environmental protection, energy conservation and low carbon, and accords with national industry and environmental protection policies.
Drawings
FIG. 1 is a schematic installation view of a prefabricated rail roof air duct of a subway station of the present invention;
FIG. 2 is a detailed view of a prefabricated rail roof wind tunnel of a subway station of the present invention;
FIG. 3 is a schematic side view of a prefabricated rail roof wind tunnel of a subway station of the present invention;
FIG. 4 is a schematic diagram of the positioning of a specially-made T-shaped steel sleeve of a connecting node structure of a prefabricated rail top air duct and a prefabricated middle plate of a subway station;
FIG. 5 is a schematic diagram of a station prefabricated middle plate groove and hole of a connecting node structure of a subway station prefabricated rail top air channel and the prefabricated middle plate;
FIG. 6 is a schematic top view of a specially-manufactured T-shaped steel sleeve of the connecting node structure of the prefabricated rail top air duct and the prefabricated middle plate of the subway station;
FIG. 7 is a schematic cross-sectional view of A-A in FIG. 6;
FIG. 8 is a schematic cross-sectional view of B-B in FIG. 6;
FIG. 9 is a schematic diagram showing the relationship between pins, grooves and holes of a connecting node structure of a prefabricated rail top air duct and a prefabricated middle plate of a subway station;
FIG. 10 is a schematic side view of a pin of a connection node structure of a prefabricated rail roof air duct and a prefabricated middle plate of a subway station;
FIG. 11 is a schematic view of an assembly of adjacent prefabricated rail roof air ducts of the present invention;
FIG. 12 is a detail view of an assembled seam of adjacent pre-fabricated rail roof air ducts of the present invention;
FIG. 13 is a schematic illustration of the placement of the elastomeric gasket of the prefabricated rail overhead tunnel seam of the present invention;
fig. 14 is an overall front view schematic of a composite assembled subway station of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other. The present invention will be described in further detail with reference to the following embodiments.
As a preferred embodiment of the present invention, as shown in fig. 1 to 13, the present invention provides a subway station pre-rail roof air duct, a connection node structure of the subway station pre-rail roof air duct and a pre-fabricated middle plate, and the specific construction is as follows.
As shown in fig. 1 and 5, the prefabricated midplane 16 is provided with midplane grooves 165 and midplane vertical holes 1612 at the design location.
As shown in fig. 2-3, the prefabricated rail top air duct 28 is composed of a rail top air duct left side wall 286, a rail top air duct right side wall 287 and a rail top air duct bottom plate 288, wherein a plurality of inverted U-shaped steel bars 289 are respectively embedded on the rail top air duct left side wall 286 and the rail top air duct right side wall 287, the longitudinal distance is L, and the inverted U-shaped steel bars 289 are anchored in the side walls.
When the prefabricated rail top air duct 28 is installed, the installation trolley 282 supports the prefabricated rail top air duct 28, the inverted U-shaped steel bars 289 penetrate through the vertical holes 1612 of the middle plate and are supported into the groove 165 of the middle plate, and pins 1615 are driven into the inverted U-shaped steel bars 289, so that the prefabricated rail top air duct 28 can be fixed below the prefabricated middle plate 16.
The prefabricated rail top air duct 28 is uniformly provided with elastic sealing gaskets 2819 at the joint with the prefabricated middle plate 16 and the joint of the adjacent rail top air duct, so as to seal the rail top air duct.
The force transmission path is as follows: prefabricated rail top air duct load-inverted U-shaped steel bar-pin-prefabricated middle plate.
As shown in fig. 4-8, the special T-shaped steel sleeve 1613 and the positioning steel bars 1614 are used for positioning the middle plate groove 165 and the middle plate vertical hole 1612, so that position deviation is prevented, the special T-shaped steel sleeve 1613 can serve as a grooving (hole) die when the middle plate is poured, the middle plate groove 165 and the middle plate vertical hole 1612 are directly formed at a specific position of the middle plate, and the rigidity of the special T-shaped steel sleeve 1613 can also be used for reinforcing a middle plate hole. The middle plate grooves 165 have a length N, a lateral pitch M, and a longitudinal pitch L.
As shown in fig. 2-3, longitudinal perforations 2810 are located in the left and right side walls of the pre-fabricated rail top air duct 28 for penetrating longitudinal locking bars 2816 to secure two adjacent rail top air ducts, steel sleeves 2817 are used for tightening the longitudinal locking bars 2816, and the tightening operation needs to be completed in the operator holes 2811; after the two prefabricated rail top air channels are fixed, grouting is performed in the joints through the embedded grouting pipe 2818, so that sealing is achieved.
As shown in fig. 1 to 13, the concrete construction process of the connection node structure of the whole prefabricated rail top air duct and the prefabricated middle plate is as follows:
s1, manufacturing a prefabricated rail top air duct 28 in a factory according to a design drawing, and reserving holes and embedded parts; processing and manufacturing a specially-made T-shaped steel sleeve 1613 and a positioning steel bar 1614;
s2, before binding the reinforcing steel bars of the prefabricated middle plate 16, placing a positioning structure formed by mutually welding a special T-shaped steel sleeve 1613 and positioning reinforcing steel bars 1614, binding the reinforcing steel bars of the prefabricated middle plate, pouring concrete, and forming a middle plate groove 165 and a middle plate vertical hole 1612 in the middle plate;
s3, conveying the manufactured prefabricated rail top air duct 28 to a construction site, and conveying the prefabricated rail top air duct to a designated position by a mounting trolley 282;
s4, lifting the installation trolley 282, and supporting the prefabricated rail top air duct 28 below the prefabricated middle plate 16, so that the inverted U-shaped steel bars 289 are accurately inserted into the middle plate vertical holes 1612 and extend into the middle plate grooves 165;
s5, driving the pin 1615 into an inverted U-shaped structure formed by the inverted U-shaped steel bars 289 from one side, respectively lapping two ends of the pin 9 on two sides of a vertical hole 1612 of the middle plate to form a shoulder pole shape, and lifting the inverted U-shaped steel bars 289; at this time, the prefabricated rail top air duct 28 is already closely attached to the prefabricated middle plate 16, and elastic sealing gaskets 2819 at the upper parts of the rail top air duct left side wall 286 and the rail top air duct right side wall 287 realize the sealing of the prefabricated rail top air duct 28 and the prefabricated middle plate 16;
s6, on the empty side of the rail top air channel, longitudinal locking steel bars 2816 are respectively penetrated into longitudinal through holes 2810 in the left side wall 286 and the right side wall 287 of the rail top air channel, joints are positioned in operation hand holes 2811, and fastening of the newly installed rail top air channel is realized through steel sleeves 2817; the elastic sealing gasket 2819 between the newly assembled rail top air duct and the previous rail top air duct can realize the sealing of the joint;
s7, repeating the steps S3-S6 until all the prefabricated rail top air channels are installed, and fastening;
s8, filling all the middle plate grooves 165 and the middle plate vertical holes 1612 with fine stone concrete, so that the steel structure joint is completely sealed in the concrete to meet the durability requirement, and simultaneously, the connection rigidity of the prefabricated middle plate 16 and the prefabricated rail top air duct 28 is improved to form a whole;
s9, cement slurry is injected into the grouting pipe 2818 pre-buried at the joint of the two prefabricated rail top air channels, gaps are filled, tightness is guaranteed, water stop strips can be attached to the joints or waterproof glue can be injected into the joints according to requirements, and multiple protection is achieved.
Other technical indexes adopted by the invention are as follows.
The prefabricated rail top air duct 28 according to the present invention may be prefabricated using high-grade concrete or lightweight concrete, etc., depending on the load-bearing condition.
The length of each prefabricated section of the prefabricated rail top air duct 28 is determined according to actual conditions, and the internal clearance size is determined according to ventilation requirements.
Thicknesses of the prefabricated rail top air duct left side wall 286, the rail top air duct right side wall 287 and the rail top air duct bottom plate 288 are determined according to calculation.
The right side wall 287 of the prefabricated rail top air duct extends out of the rail top air duct bottom 288 by a specific extension length determined by the type of the shielding door.
The rail top air duct left side wall 286, the rail top air duct right side wall 287 and the rail top air duct bottom plate 288 are preferably provided with chamfer angles at turning positions, so that collision damage of sharp corners is avoided.
The diameter of the inverted U-shaped steel bars 289 takes an optimal value according to the load of the rail top air channel and the thickness of the protective layer, the diameter is not smaller than 30mm, two inverted U-shaped steel bars 289 are arranged in parallel at each position, a certain interval is arranged between every two adjacent inverted U-shaped steel bars 289, and the contact area between the inverted U-shaped steel bars 289 and concrete is ensured.
The length of the inverted U-shaped steel bar 289 anchored in the side wall of the rail top air channel needs to meet the stress requirement.
The inverted U-shaped steel bars 289 are symmetrically arranged on the left side wall 286 of the rail top air duct and the right side wall 287 of the rail top air duct according to the required quantity determined by calculation.
The extension length of the inverted U-shaped steel bars 289 is determined according to the thickness of the prefabricated middle plate 16 and the depth of the groove 5, and for the prefabricated middle plate 16 with the thickness of 400mm, the length is preferably 370mm, so that the pin 1615 can be driven in, and the inverted U-shaped steel bars 289 have enough thickness of a protective layer after fine stone concrete is poured; other thickness plates are equally suitable for the present method.
The inverted U-shaped steel bars 289 can be other joints such as round steel, section steel and the like according to actual conditions, and the joints of other forms with the same functions are all within the scope of protection of the patent.
The installation trolley 282 needs to have the functions of lifting and horizontal walking and has enough power; the mounting trolley 282 preferably employs wheels with damping capability to dampen vibrations while walking on the floor 25.
The prefabricated middle plate 16 is usually 400mm thick, the depth of the middle plate groove 165 is preferably 100mm, the width is preferably 150mm, the length is not less than 400mm, and the pin 1615 needs to have a mounting space; the recommended side length of the middle plate vertical hole 1612 is 150mm, and a construction error space is reserved for inserting the inverted U-shaped steel bars 289; the sizes and shapes of the middle plate groove 165 and the middle plate vertical hole 1612 mentioned in the present invention can be adjusted according to actual needs.
The pin 1615 is preferably wedge-shaped, the side view of the wedge-shaped is shown in the drawing (the small end is 30mm square, the large end is 30mm rectangular, the whole pin is a three-dimensional solid formed by stretching 30mm in the thickness direction of a right trapezoid with the upper bottom being 30mm and the lower bottom being 40 mm), the pin is driven from a thinner end, the elevation of the prefabricated rail top air duct 28 can be adjusted according to the driving depth, and the prefabricated rail top air duct is guaranteed to be attached to the prefabricated middle plate 16; the pin needs to have sufficient external overlap length on both sides of the square hole 12, for example, in the case of the present invention, it is not preferable to have a length of less than 310mm to ensure that the pin 1615 is not less than 80mm in the middle plate.
The pin 1615 may be in other shapes according to actual needs, and may be formed by steel, steel plate or round steel pipe.
The special T-shaped steel sleeve 1613 consists of an upper part and a lower part, the upper part has the same size as the middle plate groove 165, the lower part has the same size as the middle plate vertical hole 1612, and the thickness of the special T-shaped steel sleeve 1613 is preferably not less than 10mm so as to play a role in reinforcing the middle plate hole; the spacing between adjacent specially-made T-shaped steel sleeves 1613 is precisely determined by positioning steel bars 1614, so that construction precision is ensured.
The special T-shaped steel sleeve 1613 can be square steel or round steel pipes and other shapes, and is determined according to practical needs, the description of the invention takes rectangular as an example, and other steel pipes with the same principle are also within the scope of the invention.
The diameter of the longitudinal through holes 2810 is slightly larger than that of the longitudinal locking steel bars 2816 (the longitudinal locking steel bars 2816 are provided with threads at two ends so as to be convenient for connecting steel sleeves, the length is the same as that of a single rail top air duct), the longitudinal through holes 2810 are symmetrically arranged at the middle height positions of the left rail top air duct side wall 286 and the right rail top air duct side wall 287 (the number of the through holes can be increased according to actual needs), the longitudinal through holes 2810 are slightly deviated to the outer side of the rail top air duct side wall, but are required to be arranged in a steel bar net so as to be convenient for inserting and fastening the longitudinal locking steel bars 2816; the depth, height and depth of the longitudinal perforation 2810 at the two ends of each prefabricated rail top air duct 28 are all required to be enlarged to form an operation hand hole 2811, the length of the operation hand hole is required to meet the installation of a steel sleeve 2817 and the fastening operation space of the subsequent longitudinal locking steel bar, and the height and depth are required to meet the operation space of screwing the steel sleeve 2817 by a spanner.
Grouting pipes 2818 are pre-buried at the joint of the air channels at the top of each two prefabricated rails, grouting can be cement slurry or grouting materials and the like, and sealing of the joint is ensured.
After the prefabricated rail top air duct is assembled, the middle plate grooves 165 and the middle plate vertical holes 1612 are filled with fine stone concrete or other filling materials.
The joint of the prefabricated rail top air duct pipe joint can be considered to adopt a yin-yang groove joint with a reserved middle hole, so that the butt joint installation and grouting sealing are facilitated.
The elastic sealing gasket 2819 is arranged at the joint of the prefabricated rail top air duct 28 and the prefabricated middle plate 16 and at the joint of the two rail top air ducts; .
The prefabricated rail top air duct, the prefabricated middle plate connecting node and the construction method of the subway station are applicable to one-layer or multi-layer structures and also applicable to single holes, double holes or multiple holes. According to construction organization and convenience requirements, a lifting device can be arranged above the middle plate of the rail top air duct, and a rope is used for hanging and lifting above the middle plate to realize installation in place.
As shown in fig. 14, the present invention further provides a composite assembled underground structure (e.g. subway station) using the above-mentioned subway station pre-rail-top air duct, the connection node structure of the subway station pre-rail-top air duct and the pre-fabricated middle plate, and the construction method thereof, wherein:
comprises an underground wall 1 and a main body structure upright post; the top of the underground wall is provided with a crown beam 5, and a steel structure clamping groove 2 for installing the prefabricated middle plate in a pre-buried mode is used for positioning and supporting when the prefabricated middle plate is hoisted, the height of the clamping groove is larger than the thickness of the middle plate, when the elevation of the clamping groove of the underground wall has errors, the clamping groove of the underground wall allows the two to move relatively, and the middle plate can still be ensured to be positioned at the designed elevation; the top of the main body structure upright post is provided with a prefabricated top longitudinal beam 8, and the middle of the main body structure upright post is provided with a prefabricated middle longitudinal beam 15. The main structure upright post comprises a pile foundation 3 and a steel upright post 4, and the steel upright post 4 is required to be inserted into the pile foundation 3 for a certain depth, so that reliable combination of the pile foundation 3 and the steel upright post is ensured; the steel upright post 4 adopts a steel pipe concrete column, steel reinforced concrete or outsourcing concrete to form a steel pipe concrete superposed column. A top plate pre-stress jack 11 is arranged between the crown beam 5 and the prefabricated top plate 9, and a middle plate pre-stress jack 19 is arranged between the steel structure clamping groove 2 and the prefabricated middle plate 16. In consideration of certain errors required for installation and positioning of the prefabricated members, transverse prestressing force is applied to the top plate prefabricated members and the middle plate prefabricated members through the top plate prestressing force jack 11 and the middle plate prestressing force jack 19 respectively, so that the reserved errors are balanced and offset, deformation of the underground wall is controlled, and safety and stability of the foundation pit and surrounding structures are ensured. The precast slabs are tensioned and locked into a whole longitudinally (in the direction of paper) by adopting prestressed steel bars or locking steel bars section by section.
The prefabricated roof 9 arranged between the prefabricated roof longitudinal beams 8, the crown beam 5 and the prefabricated roof longitudinal beams 8, the prefabricated roof 9 arranged between two adjacent prefabricated roof longitudinal beams 8, the roof cast-in-situ layer 12 on the roof and the roof flexible waterproof layer 13 on the roof cast-in-situ layer form a composite waterproof prestress roof together.
The prefabricated middle longitudinal beam 15, the steel structure clamping groove 2, the prefabricated middle plate 16 arranged between the prefabricated middle longitudinal beams 15, the prefabricated middle plate 16 arranged between the two adjacent prefabricated middle longitudinal beams 15 and the middle plate cast-in-situ layer 20 on the middle plate jointly form a composite prestress middle plate.
The prefabricated cushion layer 23, the bottom plate waterproof layer 24 and the cast-in-situ bottom plate 25 which are sequentially arranged on the substrate from bottom to top form a composite waterproof bottom plate together.
The underground wall 1 and the side wall waterproof layer and the side wall cast-in-situ layer which are sequentially arranged in the inward direction of the underground wall form a composite waterproof wall together.
The prefabricated top plate 9 is hung with a prefabricated pipeline bracket 10 through a pre-buried groove to form an integral prefabricated member. The prefabricated middle plate 16 is hung with the prefabricated pipeline bracket 10 and the prefabricated rail top air duct 28 through the pre-buried groove, and is provided with the pre-buried pipeline sleeve 18 in a penetrating way up and down to form an integral prefabricated member. Grooves are reserved on the inner side of the crown beam 5, protruding rabbets are reserved on the two sides of the prefabricated top longitudinal beam 8, protruding rabbets are reserved on the two sides of the prefabricated middle longitudinal beam 15, and the prefabricated top plate 9 and the prefabricated middle plate 16 are convenient to hoist and mount.
The composite waterproof prestress top plate, the composite prestress middle plate, the composite waterproof bottom plate and the composite waterproof wall are effectively connected to form the fully-covered waterproof fully-composite assembled underground structure, so that the problem of water leakage of the fully-assembled underground structure is solved, the limitation of the application range of the assembled underground structure is broken through, the assembled underground structure can be applied to water-rich stratum, areas with complex surrounding environment and high deformation control, and the assembled underground structure can be forcefully pushed to be widely applied to underground engineering. The invention replaces a large number of internal supports and templates of the conventional open cut cast-in-situ structure, thereby saving investment; meanwhile, the pre-axial pressure can be set on the prefabricated part to balance and offset the deformation of the assembly gaps, so that the surrounding environment can be effectively protected, and the safety of the foundation pit is ensured. The prefabricated components are manufactured in a factory and mechanically constructed, so that the high quality and the superior quality of the underground structural engineering are realized, the traditional ceiling decoration is replaced, the embedded channels are used for realizing the standardized and mechanical installation of the comprehensive pipeline, the investment and the construction period are saved, the environment-friendly construction is realized, the energy is saved, the environment is protected, the technology is advanced, the sustainable development and the environment-friendly construction are realized, the practicability is strong, and the application space is wide in the field of the underground engineering.
The invention relates to a reverse construction method of a composite assembled underground structure, which comprises the following steps:
s1, constructing an underground wall 1 and a main structure upright column, wherein a steel structure clamping groove 2 for installing a prefabricated middle plate is pre-buried on the underground wall 1; in the step S1, the underground wall 1 is a concrete underground continuous wall or a prefabricated underground wall which is poured underwater; the construction method of the main structure column comprises the steps of firstly constructing a pile foundation 3, then hoisting a steel column 4, inserting the steel column into the pile foundation 3, and forming a steel pipe concrete superposed column by the steel column 4 by adopting a steel pipe concrete column, steel reinforced concrete or outsourcing concrete.
S2, shi Zuoguan beams 5 and retaining walls 6.
S3, excavating an earth surface 7 below the roof beam, and hoisting the prefabricated roof beam 8 and the prefabricated roof 9, wherein the prefabricated pipeline bracket 10 is pre-buried in the factory manufacturing process of the prefabricated roof. Preferably, a groove is reserved in the construction of the crown beam 5, and a convex tongue-and-groove is reserved in the prefabricated roof rail 8 for hoisting and placing the prefabricated roof 9.
S4, pre-stressing is firstly applied to the prefabricated top plate 9 through a top plate pre-stressing jack 11 between the crown beam 5 and the prefabricated top plate 9, then a top plate cast-in-situ layer 12 is cast, and a top plate flexible waterproof layer 13 is constructed, wherein a plurality of soil outlet and feeding holes are longitudinally arranged along the top plate according to the requirements of soil outlet and feeding.
S5, under the support of the precast beam slab system, excavating earth downwards to the lower side of the lower middle beam synchronously, and excavating the earth 14. Preferably, in the S4-S5, after the top plate precast beam plate system, the cast-in-situ layer and the waterproof layer are completed, pipelines can be restored and backfilled with earth, traffic is restored, and the influence on urban traffic and pipelines can be reduced.
S6, hoisting the prefabricated middle longitudinal beam 15 and the prefabricated middle plate 16 by using the upper layer of soil outlet and feeding holes, wherein a hanging installation groove (formed by the inverted T-shaped steel sleeve 1613) pre-buried with the prefabricated pipeline bracket 17, the pre-buried pipeline sleeve 18 and the prefabricated rail top air duct 28 is arranged in the factory manufacturing process of the prefabricated middle plate. The underground wall 1 is embedded with a steel structure clamping groove 2 at the elevation position of the middle plate, and a convex tongue-and-groove is reserved on the prefabricated middle longitudinal beam 15 for hoisting and placing the prefabricated middle plate 16. During hoisting, the steel structure clamping groove 2 reserved in the underground diaphragm wall 1 is inserted into the middle longitudinal beam rabbet reserved in the prefabricated middle longitudinal beam 15.
S7, pre-stressing the prefabricated middle plate 16 by utilizing the middle plate pre-stressing jack 19 in the steel structure clamping groove 2, and then casting the middle plate cast-in-situ layer 20, wherein the soil outlet and the feeding holes of the middle plate correspond to the upper layer.
S8, synchronously excavating downwards under the support of the precast beam plate; and synchronously constructing an underground one-layer side wall waterproof layer 21 and an underground one-layer side wall cast-in-situ layer 22.
S9, downwards circulating S5-S7, and excavating to the bottom of the foundation pit.
S10, installing a prefabricated cushion layer 23, applying a waterproof layer 24 of a base plate and casting a base plate 25 in situ.
S11, constructing a bottom plate layer side wall waterproof layer 26 and a bottom plate layer side wall cast-in-situ layer 27; and simultaneously and sequentially replenishing the soil outlet and the feeding hole.
Preferably, after S11, further comprising:
and S12, after the main body of the composite assembled underground structure is finished and shield construction is finished within the influence range of the adjacent sections, installing the prefabricated rail top air duct 28 through a hanging installation groove pre-buried in the prefabricated middle plate, and detail seeing the concrete construction process of the connecting node structure of the prefabricated rail top air duct and the prefabricated middle plate.
The fully-covered waterproof fully-composite assembled underground structure and the construction method have the advantages that the whole construction process does not need to be provided with the support and the templates, the construction operation can be synchronized under the upper plate and the lower plate, the time for waiting for the formation of the age is greatly shortened, the construction method is environment-friendly, quick, convenient, safe, efficient, environment-friendly, energy-saving, investment-saving and the like, and the application space is wide.
The top plate, the middle plate prefabricated member and the cast-in-situ layer replace the internal support and the template, the main structure is finished after the bottom plate is closed and the side wall is finished by utilizing the arranged unearthed feeding holes, unearthed, feeding, hoisting the prefabricated middle plate and assembly machinery to enter and exit.
The structure cast-in-situ layer comprises a top plate cast-in-situ layer, a middle plate cast-in-situ layer and a cast-in-situ bottom plate, and prefabricated members are used as templates during casting, so that a large number of templates can be saved.
The fully-composite assembled underground structure construction method is characterized in that the top plate prefabricated member, the cast-in-situ layer, the middle plate prefabricated member and the cast-in-situ layer are utilized to replace an inner support system, so that the surrounding construction materials of the foundation pit can be effectively protected, and a large amount of engineering investment is saved.
The fully-composite assembled underground structure construction method is characterized in that the top plate prefabricated member, the cast-in-situ layer, the middle plate prefabricated member and the cast-in-situ layer are utilized to replace an inner support system, so that the surrounding construction materials of the foundation pit can be effectively protected, and a large amount of engineering investment is saved. In consideration of certain errors required for installation and positioning of the prefabricated members, transverse prestressing force is applied to the top plate prefabricated members and the middle plate prefabricated members through the top plate prestressing force jack and the middle plate prestressing force jack respectively, so that the reserved errors are balanced and offset, deformation of the underground wall is controlled, and safety and stability of the foundation pit and surrounding structures are ensured. The precast slabs are tensioned and locked into a whole longitudinally (in the direction of paper) by adopting prestressed steel bars or locking steel bars section by section.
The splicing and assembling of the prefabricated components of the structure are completed, and the assembled components are connected through mortises and high-strength bolts; the prefabricated cushion layer can also adopt a cast-in-place concrete structure.
The composite assembled underground structure and the construction method thereof are applicable to underground one layer, two layers and more layers, and can be applicable to a non-column single-span, single-column double-span, double-column three-span or more-span multilayer underground structure according to engineering requirements.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. The utility model provides a subway station prefabricated rail roof wind channel which characterized in that: the prefabricated rail top air duct (28) comprises a rail top air duct left side wall (286), a rail top air duct right side wall (287), a rail top air duct bottom plate (288), inverted U-shaped steel bars (289), longitudinal perforations (2810) and longitudinal locking steel bars (2816);
the rail top air duct left side wall (286), the rail top air duct right side wall (287) and the rail top air duct bottom plate (288) form a groove-shaped structure; the upper parts of the left side wall (286) of the rail top air duct and the right side wall (287) of the rail top air duct are longitudinally pre-embedded with a plurality of inverted U-shaped steel bars (289), the upper parts of the inverted U-shaped steel bars (289) extend out of the top of the side wall to form a closed loop, and the inverted U-shaped steel bars (289) are picked up by penetrating pins (1615) and are integrally embedded into prefabricated hole slots of a prefabricated middle plate (16) of a subway station to be poured into a whole;
the left side wall (286) and the right side wall (287) of the rail top air duct are provided with longitudinal perforations (2810) which are longitudinally communicated with the lower parts of the inverted U-shaped steel bars (289) and are used for penetrating the longitudinal locking steel bars (2816), so that two adjacent prefabricated rail top air ducts (28) are fixed;
chamfer angles are arranged at turning positions of the rail top air channel left side wall (286), the rail top air channel right side wall (287) and the rail top air channel bottom plate (288);
a plurality of special T-shaped steel sleeves (1613) are embedded in the prefabricated middle plate (16) and are vertically communicated in the plate thickness direction; two specially-made T-shaped steel sleeves (1613) form a pair of inverted U-shaped steel bars (289) which are transversely arranged and respectively correspond to the left side wall (286) of the rail top air duct and the right side wall (287) of the rail top air duct, and are inserted into the inverted U-shaped steel bars;
the special T-shaped steel sleeve (1613) is in a T shape formed by an upper part and a lower part, and the pin (1615) is clamped at the upper part of the T shape.
2. The subway station pre-fabricated rail roof air channel of claim 1, wherein:
the prefabricated rail top air duct (28) further comprises an operation hand hole (2811) and a steel sleeve (2817);
the end parts of the longitudinal locking bars (2816) of each prefabricated rail top air duct (28) are fixedly connected with the end parts of the longitudinal locking bars (2816) of the adjacent prefabricated rail top air duct (28) through the steel sleeve (2817);
the operation hand hole (2811) is a hole groove which is formed at two ends of the longitudinal perforation (2810) and is partially enlarged and is opened to the lateral outside of the side wall, provides an operation space for fastening connection of the steel sleeve (2817), and can be filled and sealed.
3. The subway station pre-cast rail roof tunnel according to any one of claims 1-2, wherein:
the prefabricated rail top air duct (28) further comprises an elastic sealing gasket (2819);
elastic sealing gaskets (2819) are uniformly distributed at the joint of the prefabricated rail top air duct (28) and the prefabricated middle plate (16) of the subway station and the joint of the adjacent rail top air duct to seal the rail top air duct;
an elastic sealing gasket (2819) at the joint of the prefabricated rail top air duct (28) and the prefabricated middle plate (16) of the subway station is arranged at the tops of the left side wall (286) of the rail top air duct and the right side wall (287) of the rail top air duct and at the lateral sides of the inverted U-shaped steel bars (289);
an elastic gasket (2819) at the joint of the adjacent rail top air channels is arranged along the groove shape of the rail top air channels.
4. The subway station pre-fabricated rail roof air channel of claim 1, wherein:
the upper part of the special T-shaped steel sleeve (1613) is a horizontal sleeve, the lower part of the special T-shaped steel sleeve is a vertical sleeve, and an upper middle plate groove (165) and a lower middle plate vertical hole (1612) are respectively formed in the factory prefabrication pouring process of the prefabrication middle plate (16);
the inverted U-shaped steel bar (289) passes through the middle plate vertical hole (1612) and stretches into the middle plate groove (165); the pin (1615) is arranged in the middle plate groove (165), penetrates through the upper closed loop of the inverted U-shaped steel bar (289), spans the two ends of the middle plate vertical hole (1612), and lifts up and supports the inverted U-shaped steel bar (289);
filling materials are poured into the middle plate grooves (165) and the middle plate vertical holes (1612), and the prefabricated rail top air duct (28) and the prefabricated middle plate (16) are connected into a whole.
5. The subway station pre-fabricated rail roof air channel of claim 4, wherein:
also comprises a locating reinforcing bar (1614);
the pairs of special T-shaped steel sleeves (1613) are sequentially arranged along the longitudinal direction of the subway station, and the special T-shaped steel sleeves (1613) of each pair are fixed into an integral frame through the positioning steel bars (1614) between the inside of each special T-shaped steel sleeve (1613) and between the adjacent special T-shaped steel sleeves (1613) of each pair and are buried in pouring materials of the prefabricated middle plate (16).
6. The subway station pre-fabricated rail roof wind tunnel of claim 5, wherein:
the pin (1615) is wedge-shaped and is used for adjusting the elevation of the prefabricated rail top air duct (28) to be attached to the prefabricated middle plate (16).
7. The subway station pre-fabricated rail roof wind tunnel of claim 6, wherein:
and joints of the air duct joints of the adjacent prefabricated rail tops adopt yin-yang rail groove joints with reserved middle holes, and grouting pipes (2818) are arranged on the yin-yang rail groove joints.
8. A construction method for a connection node between a prefabricated rail top air channel of a subway station and a prefabricated middle plate, which is characterized in that the prefabricated rail top air channel of the subway station is the prefabricated rail top air channel of the subway station according to any one of claims 4-7, and the construction method comprises the following steps:
s1, manufacturing a prefabricated rail top air duct (28) in a factory, and embedding a plurality of inverted U-shaped steel bars (289) on the upper parts of side walls at two ends of the prefabricated rail top air duct; manufacturing a specially-manufactured T-shaped steel sleeve (1613) by factory processing;
s2, pre-burying a special T-shaped steel sleeve (1613) manufactured by a factory before binding middle plate steel bars in construction; when the middle plate is poured, a specially-made T-shaped steel sleeve (1613) is used for forming an upper middle plate groove (165) and a lower middle plate vertical hole (1612) on the middle plate, so that a prefabricated middle plate (16) is manufactured;
s3, hoisting the prefabricated middle plate (16) in place in the construction of the subway station, and jacking the prefabricated rail top air channel (28) to a preset position after the prefabricated rail top air channel is transported to the site;
s4, jacking the prefabricated rail top air duct (28) to the lower part of the prefabricated middle plate (16), so that the inverted U-shaped steel bars (289) are inserted into the middle plate vertical holes (1612) and extend into the middle plate grooves (165);
s5, driving pins (1615) into the reserved middle plate grooves (165) to enable the pins to penetrate through the inverted U-shaped steel bars (289), wherein two ends of each pin are lapped on two sides of a vertical hole (1612) of the middle plate to form a shoulder pole shape, and lifting the inverted U-shaped steel bars (289), so that the prefabricated rail top air duct (28) is fixed;
s6, penetrating longitudinal locking steel bars (2816) with threads at two ends into longitudinal perforations (2810) reserved on the left side wall and the right side wall of the prefabricated rail top air duct, so that the newly installed prefabricated rail top air duct is fixed with the upper prefabricated rail top air duct;
s7, repeating the steps S3-S6 until all the prefabricated rail top air channels are installed, and fastening;
and S8, after the rail top air duct is assembled, finally, pouring sealing materials in the specially-made T-shaped steel sleeve (1613) to enable the prefabricated middle plate and the prefabricated rail top air duct to form a whole.
9. The construction method for the connection node between the prefabricated rail top air duct and the prefabricated middle plate of the subway station according to claim 8, which is characterized by comprising the following steps:
after S5 is completed, at the moment, the prefabricated rail top air channel is tightly attached to the prefabricated middle plate, and an elastic sealing gasket (2819) is preset at the tops of the left side wall of the rail top air channel and the right side wall of the rail top air channel, so that the prefabricated rail top air channel and the prefabricated middle plate are sealed;
after S8, further comprising:
s9, filling materials are injected into grouting pipes (2818) pre-buried at the joint of the two prefabricated rail top air channels, gaps are filled, and tightness is guaranteed.
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| CN110700872B (en) * | 2019-09-11 | 2021-08-27 | 上海宝冶建筑装饰有限公司 | Construction method of rail top air duct |
| CN111219201B (en) * | 2020-03-04 | 2024-05-17 | 广州地铁设计研究院股份有限公司 | Subway station rail top air duct combined with middle plate and construction method thereof |
| CN111593861B (en) * | 2020-04-14 | 2021-12-24 | 中铁第四勘察设计院集团有限公司 | Connecting structure of prefabricated rail top air duct and structural slab and construction method thereof |
| CN111501830A (en) * | 2020-04-30 | 2020-08-07 | 中建八局轨道交通建设有限公司 | Subway open cut station rail top air duct structure and sequential construction method thereof |
| CN111720632A (en) * | 2020-06-22 | 2020-09-29 | 中铁二院工程集团有限责任公司 | Novel prefabricated rail top wind channel suitable for subway station |
| CN114016703A (en) * | 2021-12-10 | 2022-02-08 | 中国华西企业股份有限公司 | Rail top air duct construction method |
| CN115354692A (en) * | 2022-09-20 | 2022-11-18 | 中南大学 | Modular underground comprehensive pipe gallery ventilation opening and assembling method thereof |
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