CN110042861B - Assembled rail top air duct of subway station and connecting node of assembled rail top air duct and prefabricated middle plate - Google Patents
Assembled rail top air duct of subway station and connecting node of assembled rail top air duct and prefabricated middle plate Download PDFInfo
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- CN110042861B CN110042861B CN201910355820.5A CN201910355820A CN110042861B CN 110042861 B CN110042861 B CN 110042861B CN 201910355820 A CN201910355820 A CN 201910355820A CN 110042861 B CN110042861 B CN 110042861B
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- air duct
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 72
- 239000010959 steel Substances 0.000 claims abstract description 72
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- 238000010276 construction Methods 0.000 description 22
- 238000011065 in-situ storage Methods 0.000 description 21
- 239000002131 composite material Substances 0.000 description 17
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- 238000000034 method Methods 0.000 description 5
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- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004035 construction material Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012946 outsourcing Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- 239000004519 grease Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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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
- E02D29/045—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
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
- F24F13/0245—Manufacturing or assembly of air ducts; Methods therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
Abstract
The invention discloses an assembled rail top air duct of a subway station, wherein: the prefabricated rail top air channel comprises a rail top air channel side wall, a rail top air channel bottom plate, a rail top air channel joint expansion end and a joint reserved clamping groove; the embedded part such as an H-shaped steel rail is arranged below the prefabricated middle plate of the subway station, and the rail top air duct and the joint structure thereof are designed according to the embedded steel rail, so that the rail top air duct can be mutually assembled, slipped and fixed.
Description
Technical Field
The invention belongs to the field of underground engineering of subway stations, and particularly relates to an assembled rail top air channel of a subway station and a connecting node structure of the assembled rail top air channel of the subway station and a prefabricated middle plate.
Background
At present, the following problems exist in the construction of a rail top air duct of a subway station:
(1) The rail top air channel is positioned below the middle plate of the subway station and above the rail, and is a station secondary structure, and when the rail top air channel is constructed, the scaffold for erecting the middle plate is removed, and the scaffold needs to be built again.
(2) The rail top air duct is suspended below the middle plate by utilizing the reserved steel bars of the middle plate, so that great difficulty exists in steel bar binding, concrete pouring and the like, space is suppressed, and construction quality is difficult to guarantee.
(3) The construction of the rail top air duct is time-consuming, laborious, large in investment, heavy in structural size and resistant for construction units.
Disclosure of Invention
Aiming at least one of the defects or the improvement demands of the prior art, the invention provides an assembled rail roof air channel of a subway station, wherein an embedded part such as an H-shaped steel rail is arranged below a prefabricated middle plate of the subway station, and the rail roof air channel and a joint structure thereof are designed according to the embedded steel rail, so that the rail roof air channel can be mutually assembled, slipped and fixed; and manufacturing the assembled rail top air duct section according to the design drawing in a prefabricated field, and transporting to a station to realize section-by-section assembly.
To achieve the above object, according to one aspect of the present invention, there is provided a subway station assembled rail head wind tunnel, wherein: the prefabricated rail top air channel comprises a rail top air channel side wall, a rail top air channel bottom plate, a rail top air channel joint expansion end and a joint reserved clamping groove;
the rail top air channel side wall is positioned at two sides of the rail top air channel bottom plate to form a groove structure, and the enlarged end of the rail top air channel joint is positioned at the top end of the rail top air channel side wall; the joint reserved clamping groove is formed in the rail top air channel joint expansion end and is used for being connected with an embedded part in a prefabricated middle plate of a subway station in a matching mode;
side wall limiting connection matching parts are arranged between the rail top air duct side walls of the prefabricated rail top air ducts which are longitudinally adjacent to each other at the two longitudinal ends of the rail top air duct side walls respectively;
and a bottom plate limiting connection matching piece is arranged between the rail top air duct bottom plates of the prefabricated rail top air duct longitudinally adjacent to each other at the two longitudinal ends of the rail top air duct bottom plate.
Preferably, a rail top air channel side wall groove is formed in one longitudinal end of the rail top air channel side wall, a rail top air channel side wall protrusion is formed in the other longitudinal end of the rail top air channel side wall, and the rail top air channel side wall protrusion and the rail top air channel side wall groove are in matched limiting connection with the rail top air channel side wall protrusions of the rail top air channel side walls of the longitudinally adjacent prefabricated rail top air channels respectively.
Preferably, a rail top air channel bottom plate groove is formed in one longitudinal end of the rail top air channel bottom plate, a rail top air channel bottom plate protrusion is formed in the other longitudinal end of the rail top air channel bottom plate, and the rail top air channel bottom plate protrusion and the rail top air channel bottom plate groove are in matched limiting connection with the rail top air channel bottom plate protrusions of the rail top air channel bottom plates of the longitudinally adjacent prefabricated rail top air channels respectively.
Preferably, the embedded part in the prefabricated middle plate of the subway station is an H-shaped steel rail, an upper wing plate and a part of web plates are embedded in the prefabricated middle plate, and the other part of web plates and a lower wing plate are exposed from the lower surface of the prefabricated middle plate and serve as connectors with enlarged ends of the rail top air channel connectors;
the cross section of the joint reserved clamping groove in the enlarged end of the rail top air flue joint is in an inverted T shape, and the joint reserved clamping groove is allowed to penetrate from one end of the H-shaped steel rail.
Preferably, the upper part of the enlarged end of the rail top air duct joint is transversely provided with a plurality of bolt holes, the corresponding position of the web plate of the H-shaped steel rail is also provided with a perforation, and the bolts penetrate through the bolt holes, the perforation of the web plate and the vertical grooves of the reversed T-shaped joint reserved clamping grooves to fasten the prefabricated rail top air duct and the prefabricated middle plate.
Preferably, a plurality of joint embedded steel plates are longitudinally arranged on the upper surface of the inverted T-shaped horizontal groove of the joint reserved clamping groove in the enlarged end of the rail top air flue joint and are used for sliding assembly with the upper surface of the lower wing plate of the H-shaped steel rail.
Preferably, a plurality of rolling steel balls are arranged and distributed below the joint embedded steel plate.
In order to achieve the above object, according to another aspect of the present invention, there is also provided a connection node structure of an assembled rail-roof wind tunnel and a prefabricated middle plate of a subway station, wherein: the prefabricated rail top air duct comprises the assembled rail top air duct of the subway station and also comprises a prefabricated middle plate of the subway station;
the prefabricated middle plate is internally provided with an embedded part, and the embedded part is exposed from the bottom surface of the prefabricated middle plate and is hung; the joint reservation clamping groove of the prefabricated rail top air duct penetrates from one longitudinal end of the hanging part of the embedded part to be connected with each other.
Preferably, a transverse fastening connecting piece is further arranged between the joint reserved clamping groove and the embedded piece.
Preferably, a longitudinal sliding drag reduction piece is further arranged between the joint reserved clamping groove and the embedded piece.
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. the assembled type rail top air duct of the subway station and the connecting node of the assembled type rail top air duct and the prefabricated middle plate realize the assembled construction of the rail top air duct by utilizing the embedded parts of the middle plate, particularly the H-shaped rails and the specially designed rail top air duct connector, and are simple, convenient, green and environment-friendly.
2. The assembled rail top air duct and the connecting node of the prefabricated middle plate of the subway station are high in assembly efficiency, the assembly can be completed only by a few days, and the maintenance and molding of concrete are not required, so that the construction period is greatly saved.
3. According to the assembled rail top air duct and the connecting node of the prefabricated middle plate of the subway station, a temporary scaffold is not required to be erected, the size of the prefabricated member can be properly reduced, and the cost is saved.
4. According to the assembled rail top air duct and the connecting node of the assembled rail top air duct and the prefabricated middle plate of the subway station, concrete is not required to be cast in place in a narrow space, reinforcing steel bars are bound, the anti-emotion of a constructor is alleviated, the quality is guaranteed, and the assembled rail top air duct is safe and reliable.
Drawings
FIG. 1 is a schematic cross-sectional view of the subway station assembly type rail roof air duct of the present invention when installed;
FIG. 2 is a schematic diagram of an assembled rail roof air duct and a joint of a subway station according to the invention;
FIG. 3 is a schematic side view of an assembled rail roof air duct segment of a subway station of the present invention;
FIG. 4 is a schematic side view of a joint embedded steel plate and rolling steel balls of an assembled rail top air duct of a subway station;
FIG. 5 is a schematic top view of a joint embedded steel plate and rolling steel balls of an assembled rail roof air duct of a subway station;
fig. 6 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 5, the present invention provides a subway station assembled rail roof air duct, wherein: the prefabricated rail top air channel 28 includes a rail top air channel side wall 288, a rail top air channel bottom plate 289, a rail top air channel connector enlarged end 2812, and a connector reserved clip groove 2813.
The rail top air channel side wall 288 is positioned at two sides of the rail top air channel bottom plate 289 to form a groove structure, and the rail top air channel joint expansion end 2812 is positioned at the top end of the rail top air channel side wall 288; the joint reserved clamping groove 2813 is formed in the rail top air duct joint expansion end 2812 and is used for being connected with an embedded part in the prefabricated middle plate 16 of the subway station in a matched mode. The two ends of the prefabricated middle plate 16 are respectively fixed on the prefabricated middle longitudinal beam 15 and the underground wall 1.
As shown in fig. 2-3, the two ends of the rail top air channel side wall 288 in the longitudinal direction are respectively provided with a side wall limit connection matching piece between the rail top air channel side walls of the prefabricated rail top air channels 28 adjacent to the longitudinal direction. And a bottom plate limiting connection matching part is arranged between the rail top air duct bottom plates of the prefabricated rail top air duct 28 longitudinally adjacent to the rail top air duct bottom plates 289 at the two longitudinal ends respectively. Preferably, a rail top air channel side wall groove 284 is arranged at one longitudinal end of the rail top air channel side wall 288, a rail top air channel side wall protrusion 2811 is arranged at the other longitudinal end of the rail top air channel side wall 288, and the rail top air channel side wall protrusions 2811 and the rail top air channel side wall grooves 284 are respectively in matched limit connection with the rail top air channel side walls of the longitudinally adjacent prefabricated rail top air channels 28. Preferably, a rail top air duct bottom plate groove 283 is provided at one longitudinal end of the rail top air duct bottom plate 289, and a rail top air duct bottom plate protrusion 2810 is provided at the other longitudinal end thereof, and is in matching and limiting connection with the rail top air duct bottom plate protrusion 2810 and the rail top air duct bottom plate groove 283 of the rail top air duct bottom plate of the longitudinally adjacent prefabricated rail top air duct 28, respectively. Through two types of spacing connection matching parts, the upper, lower, left and right stability of the adjacent prefabricated rail top air channel can be realized.
As shown in fig. 1-2, the embedded part in the prefabricated middle plate 16 of the subway station is an H-shaped steel rail 282, the upper wing plate and part of the web plate of the embedded part are embedded in the prefabricated middle plate 16, and the other part of the web plate and the lower wing plate are exposed from the lower surface of the prefabricated middle plate 16 and are used as connectors with the enlarged ends 2812 of the rail top air duct connectors. The cross-sectional shape of the coupler pre-reserved clip groove 2813 in the rail top air duct coupler enlarged end 2812 is inverted T-shaped, allowing penetration from one end of the H-shaped rail 282.
As shown in fig. 2, a plurality of bolt holes 2815 are transversely arranged at the upper part of the enlarged end 2812 of the rail top air duct joint, perforations are also formed at the corresponding positions of the web plates of the H-shaped steel rails 282, and bolts 287 penetrate through the bolt holes 2815, the perforations of the web plates and the vertical grooves of the inverted T-shaped joint reserved clamping grooves 2813 to firmly connect the prefabricated rail top air duct 28 with the prefabricated middle plate 16.
As shown in fig. 2, a plurality of joint embedded steel plates 2814 are longitudinally arranged on the upper surface of the inverted T-shaped horizontal groove of the joint reservation clamping groove 2813 in the enlarged end 2812 of the rail top air duct joint, and are used for sliding assembly with the upper surface of the lower wing plate of the H-shaped steel rail 282.
As shown in fig. 2 and 4-5, a plurality of rolling steel balls 2816 are arranged and distributed below the joint embedded steel plate 2814.
To achieve the above object, according to another aspect of the present invention, there is also provided a connection node structure of a subway station fabricated rail head air duct and a prefabricated middle plate, wherein the connection node structure comprises the subway station fabricated rail head air duct as described above, and further comprises a prefabricated middle plate 16 of a subway station.
The prefabricated middle plate 16 is provided with an embedded part, and the embedded part is exposed from the bottom surface of the prefabricated middle plate 16 and is hung; the joint reservation clip grooves 2813 of the pre-rail top duct 28 penetrate from one longitudinal end of the hanging portion of the embedded part to be connected with each other.
Preferably, a transverse fastening connection member, such as the aforementioned bolt, is further disposed between the connector reserved slot 2813 and the embedded member. Preferably, a longitudinal sliding drag reduction piece is further arranged between the joint reserved clamping groove 2813 and the embedded piece, such as the joint embedded steel plate and the rolling steel ball.
Other technical indexes adopted by the invention are as follows.
The fabricated prefabricated rail top air duct 28 of the present invention has a recommended length of 2 meters for each prefabricated section, and the internal clearance dimension is calculated; the recommended top-rail side wall 288 is 150mm thick, the top-rail bottom plate 289 is 100mm thick, the top-rail joint enlarged end 2812 is 400mm thick, and the H-shaped steel rail 282 is pre-embedded in the pre-fabricated middle plate 16 according to the clearance size of the fabricated pre-fabricated top-rail 28 and the recommended top-rail side wall 288 size.
The H-shaped steel rail 282 of the invention needs to have enough strength to prevent rolling steel balls 2816 from being pressed in, the specific size is determined by calculation, the fixed modulus material is recommended to be adopted, the cost is saved, and the embedded part needs to be tightly connected with the steel bars in the prefabricated middle plate 16 so as to ensure that the steel bars have enough tensile capacity.
The size of the joint reserved clamping groove 2813 is matched with the size of the embedded H-shaped steel rail 282, and the proposal is slightly larger to prevent the prefabricated rail top air duct 28 from being clamped in the moving process; grease is poured into the joint reserved clamping groove 2813, so that sliding friction resistance can be reduced, and rust of a metal joint component can be prevented.
Three bolt holes 2815 are reserved at the quarters of each section of prefabricated rail top air duct 28, the inner side of each bolt hole 2815 is a hexagonal nut expansion end, and in the assembly process, bolts 287 extend out from the inner part of the prefabricated rail top air duct 28 and are screwed up.
The rail top air channel side wall groove and the protrusion, and the rail top air channel bottom plate groove and the protrusion are all semicircular with the diameter of 10cm, so that the rail top air channel side wall groove and the protrusion are convenient to install and position.
In the invention, four joint embedded steel plates 2814 are arranged in each section of prefabricated rail top air duct 28, four rolling steel balls 2816 are embedded at the lower end of each joint embedded steel plate 2814, and the rolling steel balls 2816 are embedded in the joint embedded steel plates 2814 in a half way so as to prevent rolling out in the sliding process. Both the joint pre-buried steel plate 2814 and the rolling steel ball 2816 need to have sufficient strength.
As shown in fig. 6, the present invention further provides a composite assembled underground structure (e.g. subway station) using the above-mentioned assembled rail top air duct of the subway station, the connecting node structure of the assembled rail top air duct of the subway station and the prefabricated 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.
As shown in fig. 6, the prefabricated top plate 9 is suspended with prefabricated pipe brackets 10 through pre-buried slots 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 embedded parts, and is provided with the embedded pipeline sleeve 18 in a penetrating way up and down to form an integral prefabricated part. 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 standardized and mechanical installation of the integrated pipeline is realized by the embedded parts, 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 embedded part (formed by the H-shaped steel rail) which is embedded with the prefabricated pipeline bracket 17, the embedded 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 interval, installing the prefabricated rail top air duct 28 through the embedded part of the prefabricated middle plate, and detail seeing the concrete joint and the 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 assembled rail roof wind channel which characterized in that: the prefabricated rail top air duct (28) comprises a rail top air duct side wall (288), a rail top air duct bottom plate (289), a rail top air duct joint expansion end (2812) and a joint reserved clamping groove (2813);
the rail top air channel side wall (288) is positioned at two sides of the rail top air channel bottom plate (289) to form a groove structure, and the rail top air channel joint expansion end (2812) is positioned at the top end of the rail top air channel side wall (288); the joint reserved clamping groove (2813) is formed in the rail top air duct joint expansion end (2812) and is used for being connected with an embedded part in a prefabricated middle plate (16) of a subway station in a matching mode;
the embedded part in the prefabricated middle plate (16) of the subway station is an H-shaped steel rail (282), an upper wing plate and a part of web plate of the H-shaped steel rail are embedded in the prefabricated middle plate (16), and the embedded part is tightly connected with steel bars in the prefabricated middle plate (16); the other part of the web plate and the lower wing plate are exposed from the lower surface of the prefabricated middle plate (16) to be used as a connector with the expansion end (2812) of the rail top air duct connector;
the cross section of the joint reserved clamping groove (2813) in the enlarged end (2812) of the rail top air duct joint is in an inverted T shape, and the joint reserved clamping groove is allowed to penetrate from one end of the H-shaped steel rail (282);
a transverse fastening connecting piece is further arranged between the joint reserved clamping groove (2813) and the embedded piece;
side wall limiting connection matching parts are arranged between the rail top air duct side walls of the prefabricated rail top air ducts (28) which are longitudinally adjacent to each other at the two longitudinal ends of the rail top air duct side walls (288);
and bottom plate limiting connection matching parts are arranged between the rail top air duct bottom plates of the prefabricated rail top air ducts (28) which are longitudinally adjacent to each other at the two longitudinal ends of the rail top air duct bottom plate (289).
2. The subway station assembly rail roof air duct of claim 1, wherein:
a rail top air channel side wall groove (284) is formed in one longitudinal end of the rail top air channel side wall (288), a rail top air channel side wall protrusion (2811) is formed in the other longitudinal end of the rail top air channel side wall, and the rail top air channel side wall protrusion (2811) and the rail top air channel side wall groove (284) are in matched limiting connection with the rail top air channel side wall protrusions (2811) of the rail top air channel side walls of the longitudinally adjacent prefabricated rail top air channels (28).
3. The subway station assembly rail roof air duct of claim 1, wherein:
a rail top air channel bottom plate groove (283) is formed in one longitudinal end of the rail top air channel bottom plate (289), a rail top air channel bottom plate protrusion (2810) is formed in the other end of the rail top air channel bottom plate, and the rail top air channel bottom plate protrusion (2810) and the rail top air channel bottom plate groove (283) of the rail top air channel bottom plate of the longitudinally adjacent prefabricated rail top air channel (28) are in matched limiting connection respectively.
4. A subway station assembly rail roof tunnel according to any one of claims 1-3, wherein:
the upper part of the rail top air duct joint expansion end (2812) is transversely provided with a plurality of bolt holes (2815), the web corresponding position of the H-shaped steel rail (282) is also provided with a perforation, the bolt (287) penetrates through the bolt holes (2815), the perforation of the web and the vertical groove of the inverted T-shaped joint reserved clamping groove (2813), and the prefabricated rail top air duct (28) is fixedly connected with the prefabricated middle plate (16).
5. A subway station assembly rail roof tunnel according to any one of claims 1-3, wherein:
a plurality of joint embedded steel plates (2814) are longitudinally arranged on the upper surface of the inverted T-shaped horizontal groove of the joint reserved clamping groove (2813) in the rail top air duct joint expansion end (2812) and are used for sliding assembly with the upper surface of the lower wing plate of the H-shaped steel rail (282).
6. The subway station-mounted rail roof air duct of claim 5, wherein:
a plurality of rolling steel balls (2816) are arranged and distributed below the joint embedded steel plate (2814).
7. A connection node structure of subway station assembled rail top wind channel and prefabricated medium plate, its characterized in that: comprising a subway station assembled rail roof wind tunnel according to any of claims 1-6, further comprising a prefabricated middle plate (16) of the subway station;
an embedded part is arranged in the prefabricated middle plate (16), and the embedded part is exposed out of the bottom surface of the prefabricated middle plate (16) and is hung; the joint reservation clamping groove (2813) of the prefabricated rail top air duct (28) penetrates from one longitudinal end of the hanging part of the embedded part to be connected with each other.
8. The connection node structure of the subway station assembly type rail top air channel and the prefabricated middle plate according to claim 7, wherein:
and a transverse fastening connecting piece is further arranged between the joint reserved clamping groove (2813) and the embedded piece.
9. The connection node structure of the subway station assembly type rail top air channel and the prefabricated middle plate according to claim 7, wherein:
and a longitudinal sliding drag reduction piece is further arranged between the joint reserved clamping groove (2813) and the embedded piece.
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| 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 |
| CN111501586A (en) * | 2020-04-14 | 2020-08-07 | 中铁第四勘察设计院集团有限公司 | Assembled platform |
| CN112012239B (en) * | 2020-08-11 | 2023-02-17 | 广州地铁设计研究院股份有限公司 | Assembling structure and assembling method for prefabricated middle plate at hole of station |
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| MX2013003026A (en) * | 2010-09-17 | 2013-09-26 | Urbanetics Inc | Composite building module with a thermal mass radiator. |
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