CN116446926B - Structure conversion method for forming integral subway station by double-hole closely-attached jacking pipe - Google Patents
Structure conversion method for forming integral subway station by double-hole closely-attached jacking pipe Download PDFInfo
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- CN116446926B CN116446926B CN202310266580.8A CN202310266580A CN116446926B CN 116446926 B CN116446926 B CN 116446926B CN 202310266580 A CN202310266580 A CN 202310266580A CN 116446926 B CN116446926 B CN 116446926B
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 43
- 238000010276 construction Methods 0.000 claims abstract description 62
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 238000005266 casting Methods 0.000 claims abstract description 20
- 238000004078 waterproofing Methods 0.000 claims abstract description 4
- 238000009412 basement excavation Methods 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 5
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 210000001503 joint Anatomy 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009415 formwork Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D13/00—Large underground chambers; Methods or apparatus for making them
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Civil Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a structure conversion method for forming an integral subway station by closely adhering double-hole jacking pipes, which comprises the following steps: prefabricating a pipe-jacking pipe piece component; digging a foundation pit, and constructing a jacking pipe starting well and a receiving well; hoisting a pipe jacking machine in the starting well, and installing power equipment; hoisting left and right hole duct piece components, and jacking the left and right hole duct piece components; grouting and waterproofing are carried out between duct piece components; casting and forming a post-pouring top longitudinal beam, a post-pouring bottom longitudinal beam, a post-pouring middle longitudinal beam, a stand column, a post-pouring left middle plate and a post-pouring right middle plate by relying on pre-buried steel bars, temporary side walls and temporary supporting pieces; removing the temporary side wall, and pouring and forming a post-pouring middle plate, a post-pouring top plate and a post-pouring bottom plate; and assembling a prefabricated track bedplate and a rail top air duct. The invention obviously reduces the deformation of the subway station by the double-hole close-fitting pipe jacking method in the structure conversion process, improves the longitudinal rigidity and the overall bearing performance of the pipe jacking station, has higher construction efficiency and construction feasibility, can reduce the occupation of construction space and reduce the construction cost.
Description
Technical Field
The invention relates to the technical field of underground engineering, in particular to a structure conversion method for forming an integral subway station by closely adhering push pipes with double holes.
Background
The pipe jacking method is a construction method adopted when a tunnel or an underground pipeline passes through barriers such as railways, roads, rivers or building (construction) structures. The rectangular jacking pipe is characterized in that the jacking pipe joint adopts a rectangular structure, so that the utilization of the underground structural space is facilitated. In the construction of a subway station, because the section of the subway station is too large, if the construction is carried out by adopting a pipe jacking method, a pipe jacking scheme with double holes and more than multiple holes is needed. The prior invention patent CN107559026A discloses a subway station with double-hole double-layer pipe-jacking space combination, which adopts a left double-hole pipe-jacking tunnel and a right double-hole pipe-jacking tunnel to be communicated through a transverse channel, and realizes that the construction of the separated subway station in the space combination by adopting a pipe-jacking method is realized. However, the separated subway station is not beneficial to the overall exploitation and utilization of the underground space. The side surface of the jacking pipe needs to be manually excavated to serve as a connecting channel, and the construction has great influence on the surrounding environment. And because of being the disconnect-type subway station, connect two routes through the connecting channel, crowd evacuation effect is not good when emergency happens.
The space utilization rate is high when the integral subway station is underground, but the difficulty of constructing the integral subway station by a pipe jacking method is larger. In order to connect station substructure, need demolish interim section of jurisdiction, consequently need carry out the structure atress conversion before demolishing interim section of jurisdiction, reduce station structure deformation. However, no mature construction method exists in the construction of subway stations at present, and the double-hole closely-attached pipe-jacking sub-structure can be formed into an integral subway station structure.
In view of the above, the invention provides a structure conversion method for forming an integral subway station by closely sticking a jacking pipe with double holes, so as to solve the construction problem of the integral subway station.
Disclosure of Invention
The invention aims to provide a structure conversion method for forming an integral subway station by double-hole close-fitting jacking pipes, which forms a longitudinal and transverse structure conversion system with reasonable stress by optimizing construction procedures and remarkably reduces the deformation of the subway station by the double-hole close-fitting jacking pipe method in the structure conversion process; through the organic combination of post-cast structure and prefabricated structure, the longitudinal rigidity and the overall bearing performance of the push pipe station are improved, the construction efficiency and the construction feasibility are higher, the occupation of construction space is reduced, and the construction cost is reduced.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a structure conversion method for forming an integral subway station by closely adhering double-hole jacking pipes, which comprises the following steps:
The method comprises the steps that firstly, pipe-jacking pipe piece components are prefabricated, the pipe-jacking pipe piece components are divided into a left pipe-segment component and a right pipe-segment component which are symmetrically arranged, the left pipe-segment component and the right pipe-segment component respectively comprise a top plate, a bottom plate, a permanent side wall, a temporary side wall and a temporary support piece, embedded steel bars are correspondingly arranged on the inner side of the top plate and the inner side of the bottom plate, two ends of the temporary side wall are respectively connected with the top plate and the bottom plate in a detachable mode, and two ends of the temporary support piece are respectively connected with the middle part of the temporary side wall and the middle part of the permanent side wall in a detachable mode;
Step two, excavating a foundation pit, and constructing a jacking pipe originating well and a receiving well;
thirdly, hoisting a pipe jacking machine in the starting well, and installing power equipment; hoisting a left hole duct piece member to form a half station structure system;
Step four, breaking the enclosure structure in the range of the originating well, jacking the left hole duct piece component for mechanized excavation construction, and lifting excavated earthwork from the originating well synchronously until the left hole duct piece component is jacked out of the receiving well enclosure pile; breaking the guard piles within the head range of the pipe jacking machine of the receiving well to finish the receiving of the pipe jacking machine;
Step five, adjusting the direction of a pipe jacking machine head in the receiving well, and then carrying out jacking construction on the right hole pipe piece component in the receiving well in the mode of step three and step four, wherein after the jacking construction is finished, center joints are formed between the left hole pipe piece component and the top plate and between the bottom plate of the right hole pipe piece component; hanging the pipe jacking machine out after receiving the pipe jacking machine in the starting well, and finishing the mechanized excavation and application of the station structure;
step six, grouting and waterproofing are carried out on the soil facing sides around the center joint between the top plate and the bottom plate of the left hole duct piece member and the right hole duct piece member;
Step seven, casting and forming a post-cast top longitudinal beam, a post-cast bottom longitudinal beam, a post-cast middle longitudinal beam, a stand column and a post-cast left middle plate in a left hole duct piece member by means of the embedded steel bars, the temporary side walls and the temporary supporting pieces, and casting and forming a post-cast top longitudinal beam, a post-cast bottom longitudinal beam, a post-cast middle longitudinal beam, a stand column and a post-cast right middle plate in a right hole duct piece member; the post-cast middle longitudinal beams are respectively connected with the post-cast top longitudinal beams, and the post-cast bottom longitudinal beams are respectively connected to provide longitudinal support;
Removing a non-supporting part of the temporary side wall, which is not connected with the temporary supporting piece, forming a first interval area between the remaining supporting parts of the temporary side wall, casting a half of post-cast middle plate on the first interval area of the supporting part of the temporary side wall by the temporary supporting piece, casting a half of post-cast top plate between post-cast top stringers of the first interval area, and casting a half of post-cast bottom plate between post-cast bottom stringers of the first interval area;
And step nine, removing the rest supporting parts of the temporary side walls, forming a second interval area between the middle plates of the post-cast middle part which is cast and formed, casting and forming the other half of the middle plates of the post-cast middle part, the top plate of the post-cast and the bottom plate of the post-cast in the mode of the step eight, and transversely penetrating through the top pipes by the middle plates of the left side of the post-cast, the middle plates of the right side of the post-cast, the middle plates of the post-cast and the longitudinal beams of the post-cast middle part, so that the left hole duct piece member and the right hole duct piece member are connected into a whole.
Further, the longitudinal length of each ring of the duct piece member is 2m.
Further, the top plate, the bottom plate and the permanent side wall are of a prefabricated reinforced concrete structure formed by integrally casting, the temporary side wall is formed by assembling grid steel plates, the temporary supporting piece is of a steel structure, and the top plate and the bottom plate are respectively connected with the temporary side wall through bolts.
Further, the temporary side wall comprises a supporting part which is parallel to and connected with the temporary supporting piece and non-supporting parts which are positioned at two sides of the supporting part; the middle part of the supporting part of the temporary side wall extends to the side face to form a supporting face, and one end of the temporary supporting piece is arranged on the supporting face.
Furthermore, the top plate and the bottom plate are also provided with embedded grouting pipes.
Further, in the second step, the construction of the pipe-jacking originating well and the receiving well specifically includes:
measuring and lofting, and constructing shaft enclosures at two ends of a station;
leveling a field, and constructing a vertical shaft enclosure structure;
Digging a foundation pit dewatering well;
Excavating earthwork to construct a foundation pit support;
excavating to the designed elevation of the foundation pit bottom, and carrying out Shi Zuokeng bottom cushion layer;
And constructing a vertical shaft lining wall, wherein an originating hole is reserved in the jacking direction of the jacking pipe by the lining wall.
In the second step, after the pipe jacking starting well and the receiving well are constructed, the end heads of the starting well and the receiving well, which are jacked into the construction range, are further subjected to jet grouting pile or stirring pile reinforcement.
In the fourth step, pretensioning of the pipe joint steel strand is performed during jacking construction; and after the protection pile in the head range of the top pipe of the receiving well is broken, the prestressed steel strand is tensioned until the design internal force is reached after the push bench is received.
Further, in the seventh step, the post-cast top longitudinal beam, the post-cast bottom longitudinal beam, the post-cast middle longitudinal beam, the upright post and the post-cast left middle plate are cast and formed in the left hole duct piece member by the embedded steel bars, the temporary side walls and the temporary supporting pieces, and the post-cast top longitudinal beam, the post-cast bottom longitudinal beam, the post-cast middle longitudinal beam, the upright post and the post-cast right middle plate are cast and formed in the right hole duct piece member, specifically:
Pouring and forming post-pouring top longitudinal beams and post-pouring bottom longitudinal beams at the embedded bars of the left hole duct piece member, pouring and forming post-pouring middle longitudinal beams at the side edges of the temporary supporting pieces of the left hole duct piece member, and pouring and forming upright posts between the post-pouring top longitudinal beams and the post-pouring middle longitudinal beams and between the post-pouring bottom longitudinal beams and the post-pouring middle longitudinal beams respectively; pouring and forming the post-pouring left middle plate in an area between the permanent side wall above the temporary support piece and the post-pouring middle longitudinal beam;
Pouring and forming post-pouring top longitudinal beams and post-pouring bottom longitudinal beams at the embedded bars of the right hole duct piece member, pouring and forming post-pouring middle longitudinal beams at the side edges of the temporary supporting pieces of the left hole duct piece member, and pouring and forming upright posts between the post-pouring top longitudinal beams and the post-pouring middle longitudinal beams and between the post-pouring bottom longitudinal beams and the post-pouring middle longitudinal beams respectively; and pouring and forming the post-pouring right middle plate in an area between the permanent side wall above the temporary support piece and the post-pouring middle longitudinal beam.
After the scheme is adopted, the invention has the following beneficial effects:
1) According to the invention, the longitudinal rigidity of the temporary side wall is effectively utilized by optimizing the construction procedure, the construction of the internal longitudinal structure (post-pouring top longitudinal beam, post-pouring bottom longitudinal beam and post-pouring middle longitudinal beam) of the station is firstly completed, the post-pouring top plate and the post-pouring bottom plate are timely poured and formed after the temporary side wall is removed, the longitudinal rigidity of the station structure is re-reinforced, a longitudinal stress system taking the longitudinal beam, the upright post, the post-pouring top and the bottom plate as main bearing members is formed, the structural conversion of the station structure from the construction working condition to the use working condition is completed, the longitudinal stress performance is better, and the longitudinal deformation of the station is effectively controlled. Therefore, the invention solves the problem of longitudinal stress of the multi-ring discrete prefabricated pipe joint and the problem of longitudinal stress conversion of the station structure from temporary construction working conditions to permanent use working conditions.
2) The temporary side wall of the non-supporting part is removed firstly during structural conversion, construction space is provided for pouring of the post-pouring middle plate, the post-pouring top plate and the post-pouring bottom plate, the post-pouring left middle plate and the post-pouring right middle plate are removed after the through force transmission is completed, a transverse stress system taking the station middle plate as a main bearing member is formed, the transverse stress performance is good, and the problem of transverse stress conversion of the station structure from temporary construction working conditions to permanent use working conditions is solved.
3) The invention fully utilizes the function of the temporary support piece in the structure conversion process, and the temporary support piece positioned below the post-cast middle plate (the post-cast left middle plate, the post-cast left middle plate and the post-cast right middle plate) can bear the transverse water and soil pressure transmitted from the side wall of the station under the construction working condition, can also provide vertical support for the pouring template of the post-cast middle plate during the structure conversion, avoids the dangerous construction procedures of setting up temporary scaffolds, high formwork and the like of the post-cast middle plate, and reduces the occupation of construction space and construction cost.
4) The invention realizes the structural conversion from the construction working condition to the use working condition of the double-hole closely-attached pipe-jacking subway station, provides key technical support for the construction of the whole double-hole pipe-jacking subway station, provides a new thought and solution for similar construction, and promotes the further development of underground space utilization and construction.
Drawings
Fig. 1 is a plan view of a subway station to which the structure conversion method of forming an integral subway station by closely attaching a jacking pipe with double holes of the invention is applied.
Fig. 2 is a cross-sectional view of subway station A-A in fig. 1.
FIG. 3 is a construction process diagram 1;
Fig. 4 is a construction process diagram 2;
Fig. 5 is a construction process diagram 3;
FIG. 6 is a work process diagram 4;
Fig. 7 is a construction work process diagram 5;
FIG. 8 is a section B-B of FIG. 5;
FIG. 9 is a cross-sectional view taken along line C-C of FIG. 5;
FIG. 10 is a section view D-D of FIG. 6;
FIG. 11 is a section E-E of FIG. 6;
fig. 12 is a perspective view of the whole pipe fitting.
Description of the reference numerals
Double-hole closely-attached pipe-jacking subway station 100, starting well 200, receiving well 300, station entrance and exit 400, station accessory equipment 500 and ground 600
Left hole duct piece member 10, right hole duct piece member 20, top plate 11, bottom plate 12, permanent side wall 13, temporary side wall 14, supporting portion 141, supporting surface 142, temporary supporting piece 15, embedded steel bar 16, center seam 17, track platen 18, rail top air duct 19
Post-cast top longitudinal beam 101, post-cast bottom longitudinal beam 102, post-cast middle longitudinal beam 103, upright post 104, post-cast left middle plate 105, post-cast right middle plate 106, post-cast middle plate 107, post-cast top plate 108, post-cast bottom plate 109 and pre-buried grouting pipe 110.
Detailed Description
As shown in fig. 1-12, the invention discloses a structure conversion method for forming an integral subway station by double-hole close-fitting pipe-jacking, which can be applied to construction of a double-hole close-fitting pipe-jacking subway station 100, and as shown in fig. 1, the double-hole close-fitting pipe-jacking subway station 100 is matched with an originating well 200, a receiving well 300, a station entrance 400, station wind kiosks, equipment and other auxiliary equipment 500 of a vehicle station such as a house.
The structure conversion method comprises the following steps:
S1, prefabricating pipe-jacking pipe segment members, wherein the prefabricating process is generally carried out in a factory, the longitudinal length of each ring of pipe segment members can be adjusted according to needs, the reference length of the embodiment is 2m, the pipe segment members are divided into a left pipe segment member 10 and a right pipe segment member 20 which are symmetrically arranged, the left pipe segment member 10 and the right pipe segment member 20 respectively comprise a top plate 11, a bottom plate 12, a permanent side wall 13, a temporary side wall 14 and a temporary support 15, embedded steel bars 16 are correspondingly arranged on the inner side of the top plate 11 and the inner side of the bottom plate 12, the distance between the embedded steel bars 16 and the end part, close to the temporary side wall 14, of the top plate 11 or the bottom plate 12 is one third of the length of the top plate 11 or the bottom plate 12, two ends of the temporary side wall 14 are respectively connected with the top plate 11 and the bottom plate 12 in a detachable mode, the temporary support 15 is transversely arranged in the left pipe segment member 10 and the right pipe segment member 20, and two ends of the temporary support 15 are respectively connected with the middle part of the temporary side wall 14 and the middle part of the permanent side wall 13 in a detachable mode. In this embodiment, preferably, the top plate 11, the bottom plate 12 and the permanent side wall 13 are integrally cast and formed precast reinforced concrete structures, the temporary side wall 14 and the temporary support 15 are all steel structures, and the top plate 11 and the bottom plate 12 are respectively connected with the temporary side wall 14 by bolts. In order to facilitate the installation of the temporary support 15, the middle part of the temporary side wall 14 extends to the side to form a support part 142, and one end of the temporary support 15 is erected on the support part 142. Also, the temporary side wall 14 includes a supporting portion 141 parallel to and connected to the temporary support 15 and non-supporting portions (not shown) located at both sides of the supporting portion; the middle part of the supporting part 141 of the temporary side wall 14 extends to the side to form a supporting surface 142, and one end of the temporary supporting member 15 is erected on the supporting surface 142.
S2, excavating a foundation pit, and constructing a jacking pipe originating well 200 and a receiving well 300, wherein the method specifically comprises the following steps: measuring and lofting, and constructing shaft enclosures at two ends of a station; leveling the field, and constructing a shaft enclosure structure (enclosure piles or underground continuous walls); digging a foundation pit dewatering well; excavating earthwork to construct a foundation pit support; excavating to the designed elevation of the foundation pit bottom, and carrying out Shi Zuokeng bottom cushion layer; and constructing a vertical shaft lining wall, wherein an originating hole is reserved in the jacking direction of the jacking pipe by the lining wall. The open cut shaft structures at the two ends of the station are used as the jacking pipe originating well 200 and the receiving well 300, station accessory equipment 500 and station structures connected with the station entrance 400.
And S3, performing jet grouting pile or stirring pile reinforcement at the end of the jacking construction range of the initiating well 200 and the receiving well 300.
S4, hoisting a pipe jacking machine in the starting well 200, and installing power equipment; and hoisting the left hole duct piece member 10 to form a half station structure system.
S5, breaking the enclosure structure within the range of the originating well 200, jacking the left hole segment member 10 for mechanized excavation construction, and lifting excavated earthwork from the originating well 200 synchronously until the left hole segment member 10 is jacked out of the enclosure pile of the receiving well 300; pre-tensioning the steel strands of the pipe joint during jacking construction; breaking the guard piles within the range of the pipe jacking machine head of the receiving well 300 to finish the receiving of the pipe jacking machine; and tensioning the prestressed steel strand to the design internal force after the push bench receives the steel strand.
S6, adjusting the direction of the pipe jacking machine head in the receiving well 300, then carrying out jacking construction of the right hole duct piece member 20 in the receiving well 300 in a mode of step S4 and step S5, and forming a center joint 17 between the left hole duct piece member 10 and the top plate 11 and between the bottom plate 12 of the right hole duct piece member 20 after the jacking construction is finished; hanging the pipe jacking machine out after receiving the pipe jacking machine in the originating well 200, and finishing the mechanized excavation and application of the station structure;
s7, grouting and waterproofing are carried out on the soil facing sides around the center joints 17 between the top plates 11 and the bottom plates 12 of the left hole duct piece member 10 and the right hole duct piece member 20;
s8, referring to FIG. 4, the embedded bars 16, the temporary side walls 14 and the temporary supports 15 are used for casting and forming a post-cast top longitudinal beam 101, a post-cast bottom longitudinal beam 102, a post-cast middle longitudinal beam 103, a stand column 104 and a post-cast left middle plate 105 in the left hole duct piece member 10, and casting and forming the post-cast top longitudinal beam 101, the post-cast bottom longitudinal beam 102, the post-cast middle longitudinal beam 103, the stand column 104 and a post-cast right middle plate 106 in the right hole duct piece member 20; the posts 104 connect the post-cast center stringers 103 with the post-cast top stringers 101, respectively, and the post-cast bottom stringers 102, respectively, to form a stringer structure to provide longitudinal support. The casting and forming process of the post-cast top longitudinal beam 101, the post-cast bottom longitudinal beam 102, the post-cast middle longitudinal beam 103, the upright post 104, the post-cast left middle plate 105 and the post-cast right middle plate 106 specifically comprises the following steps:
Pouring and forming a post-pouring top longitudinal beam 101 and a post-pouring bottom longitudinal beam 102 at the embedded bars 16 of the left hole duct piece member 10, pouring and forming a post-pouring middle longitudinal beam 103 at the side edge of the temporary support 15 of the left hole duct piece member 10, and pouring and forming upright posts 104 between the post-pouring top longitudinal beam 101 and the post-pouring middle longitudinal beam 103 and between the post-pouring bottom longitudinal beam 102 and the post-pouring middle longitudinal beam 103 respectively; casting and forming the post-cast left middle plate 105 in the area between the permanent side wall 13 above the temporary support 15 and the post-cast middle longitudinal beam 103;
Pouring and forming a post-pouring top longitudinal beam 101 and a post-pouring bottom longitudinal beam 102 at the embedded bars 16 of the right hole duct piece member 20, pouring and forming a post-pouring middle longitudinal beam 103 at the side edge of the temporary support 15 of the left hole duct piece member 10, and pouring and forming upright posts 104 between the post-pouring top longitudinal beam 101 and the post-pouring middle longitudinal beam 103 and between the post-pouring bottom longitudinal beam 102 and the post-pouring middle longitudinal beam 103 respectively; and pouring and forming the post-pouring right middle plate 106 in the area between the permanent side wall 13 above the temporary support 15 and the post-pouring middle longitudinal beam 103.
S9, referring to fig. 5, 8 and 9, firstly removing non-supporting parts (not shown in the drawings) of the temporary side wall 14 which are not connected with the temporary supporting piece 15, forming a first interval area D1 between the remaining supporting parts 141 of the temporary side wall 14, pouring a half of post-pouring middle plate 107 by the temporary supporting piece 15 in the first interval area D1 of the supporting parts 141 of the temporary side wall 14, pouring and forming a half of post-pouring top plate 108 between post-pouring top longitudinal beams 101 of the first interval area D1, and pouring and forming a half of post-pouring bottom plate 109 between post-pouring bottom longitudinal beams 102 of the first interval area D1;
S10, referring to FIGS. 6 and 10-12, removing the rest supporting parts 141 of the temporary side walls 14, forming a second interval area D2 between the poured and molded post-cast middle plates 107, pouring and molding the other half of the post-cast middle plates 107, the post-cast top plates 108 and the post-cast bottom plates 109 in the second interval area D2 in a mode of step S9, wherein the post-cast left middle plate 105, the post-cast right middle plate 106, the post-cast middle plates 107 and the post-cast middle longitudinal beams 103 transversely penetrate through top pipes, so that the left hole duct piece member 10 and the right hole duct piece member 20 are connected into a pipe fitting whole shown in FIG. 12;
referring to fig. 7 and 12, after the whole pipe fitting structure is converted, the prefabricated track platen 18 and the rail top air duct 19 are assembled in the station, so that the prefabricated track platen and the rail top air duct and the pipe fitting are integrally formed into an integrally assembled subway station structure.
The structure conversion method for forming the integral subway station by the double-hole closely-attached jacking pipe disclosed by the embodiment has the following beneficial effects:
1. Realize the vertical atress conversion of the close push pipe subway station in two holes: when the pipe-jacking pipe piece is prefabricated in a prefabrication factory, embedded bars 16 can be arranged in the top plate 11 and the bottom plate 12 which are close to the 1/3 hole width position of the middle joint of the left hole and the right hole, and the top plate 11 and the bottom plate 12 are supported by the temporary side wall 14 when the left hole pipe piece component 10 and the right hole pipe piece component 20 are jacked in. After the jacking is finished, concrete is poured at the embedded bars 16, and the post-pouring bottom longitudinal beam 102, the lower upright post 104, the post-pouring middle longitudinal beam 103, the upper upright post 104 and the post-pouring top longitudinal beam 101 are sequentially constructed from bottom to top. The stringers 101, 102, 103 and the upright post 104 which are formed by casting can provide a certain vertical bearing capacity, so that the two side temporary side walls 14 which are not connected with the temporary support 15 can be removed, and the middle temporary side wall 14 which is connected with the temporary support 15 is reserved, so that the horizontal stress of the left hole duct piece member 10 and the right hole duct piece member 20 is not influenced. After the temporary side wall 14 on one side is removed, a half of post-cast top plate 108 and a half of post-cast bottom plate 109 can be cast and formed, so that the vertical bearing capacity of the temporary side wall 14 of the station structure is further enhanced; after removing all temporary side walls 14, another half of post-cast top plate 108 and post-cast bottom plate 109 are cast. By the vertical stress conversion method, the problem that the vertical stress conversion of the station structure from the temporary construction working condition to the permanent use working condition is solved by converting the vertical load carried by the temporary side wall 14 under the construction working condition into the vertical stress carried by the longitudinal beams 101, 102, 103, the upright post 104, the post-cast top plate 108 and the post-cast bottom plate 109 under the use working condition under the condition that the station bears the external load is realized.
2. Realize the horizontal atress conversion of the close push pipe subway station of two holes: temporary supports 15 are arranged in the middle of the permanent side wall 13 and the temporary side wall 14 of the left hole duct piece member 10 and the right hole duct piece member 20, the temporary supports 15 are positioned below a post-cast middle plate (comprising a post-cast left side middle plate 105, a post-cast right side middle plate 106, a post-cast middle plate 107 and a post-cast middle longitudinal beam 103), and a transverse bearing member can be provided for the left hole duct piece member 10 and the right hole duct piece member 20 during jacking construction. As described above, before pouring the middle plate, the non-supporting portion of the temporary side wall 14 that is not connected to the temporary support 15 is removed, the supporting portion 141 that is connected to the temporary support 15 is reserved, so as to form the first spacing area D1, and then the post-pouring left middle plate 105 and the post-pouring right middle plate 106 are poured on the upper portion of the temporary support 15, and half of the middle plate 107 is poured by using the first spacing area D1, so that the middle plate is penetrated laterally in the station structure, so as to transmit the lateral load. After the temporary supporting piece 15 is removed, the transverse load of the station structure is borne by the temporary supporting piece 15 under the construction working condition and is converted into a permanent use working condition, and the temporary supporting piece is borne by the post-cast left middle plate 105, the post-cast right middle plate 106 and the post-cast middle plate 107; after the temporary side wall 14 is completely removed, the middle plate 107 is half of the rest of the post-cast construction. The method solves the problem of transverse stress conversion of the station structure from a temporary construction working condition to a permanent use working condition.
3. Realize the improvement of the longitudinal rigidity of the double-hole closely-attached pipe-jacking subway station: the station external structure is composed of prefabricated ring-jacking pipe joints (namely pipe piece members), and because the pipe joints are distributed in a longitudinal discrete mode, the longitudinal rigidity is weak, and the pipe joints are easily influenced by adverse factors such as uneven settlement of a foundation, and water leakage is generated. The station structure is longitudinally connected into a whole through the structures such as the post-pouring longitudinal beams 101, 102 and 103, the upright posts 104, the post-pouring top plate 105, the post-pouring bottom plate 109, the post-pouring middle plates 105, 106 and 107, and the like, so that the longitudinal rigidity of the pipe fitting structure is improved. The combined use of the cast-in-situ structure and the prefabricated structure solves the problem of weak longitudinal rigidity of the push pipe subway station and improves the integrity of the station structure.
4. The temporary supporting piece 15 positioned below the post-pouring middle plates 105, 106 and 107 can bear transverse water and soil pressure transmitted from the station side wall in the construction working condition, can also provide vertical support for pouring templates of the post-pouring middle plates 105, 106 and 107 in the structure conversion process, avoids dangerous construction procedures such as temporary scaffolds, high formwork and the like needing to be erected in the process of pouring the post-pouring middle plates 105, 106 and 107, and is more economical and reasonable in design.
The above embodiments are merely examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent arrangements, improvements, etc. within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (8)
1. The structure conversion method for forming the integral subway station by the double-hole closely-attached jacking pipe is characterized by comprising the following steps of:
The method comprises the steps that firstly, pipe-jacking pipe piece components are prefabricated, the pipe-jacking pipe piece components are divided into a left pipe-segment component and a right pipe-segment component which are symmetrically arranged, the left pipe-segment component and the right pipe-segment component respectively comprise a top plate, a bottom plate, a permanent side wall, a temporary side wall and a temporary support piece, embedded steel bars are correspondingly arranged on the inner side of the top plate and the inner side of the bottom plate, two ends of the temporary side wall are respectively connected with the top plate and the bottom plate in a detachable mode, and two ends of the temporary support piece are respectively connected with the middle part of the temporary side wall and the middle part of the permanent side wall in a detachable mode;
Step two, excavating a foundation pit, and constructing a jacking pipe originating well and a receiving well;
thirdly, hoisting a pipe jacking machine in the starting well, and installing power equipment; hoisting a left hole duct piece member to form a half station structure system;
Step four, breaking the enclosure structure in the range of the originating well, jacking the left hole duct piece component for mechanized excavation construction, and lifting excavated earthwork from the originating well synchronously until the left hole duct piece component is jacked out of the receiving well enclosure pile; breaking the guard piles within the head range of the pipe jacking machine of the receiving well to finish the receiving of the pipe jacking machine;
Step five, adjusting the direction of a pipe jacking machine head in the receiving well, and then carrying out jacking construction on the right hole pipe piece component in the receiving well in the mode of step three and step four, wherein after the jacking construction is finished, center joints are formed between the left hole pipe piece component and the top plate and between the bottom plate of the right hole pipe piece component; hanging the pipe jacking machine out after receiving the pipe jacking machine in the starting well, and finishing the mechanized excavation and application of the station structure;
step six, grouting and waterproofing are carried out on the soil facing sides around the center joint between the top plate and the bottom plate of the left hole duct piece member and the right hole duct piece member;
Step seven, casting and forming a post-cast top longitudinal beam, a post-cast bottom longitudinal beam, a post-cast middle longitudinal beam, a stand column and a post-cast left middle plate in a left hole duct piece member by means of the embedded steel bars, the temporary side walls and the temporary supporting pieces, and casting and forming a post-cast top longitudinal beam, a post-cast bottom longitudinal beam, a post-cast middle longitudinal beam, a stand column and a post-cast right middle plate in a right hole duct piece member; the post-cast middle longitudinal beams are respectively connected with the post-cast top longitudinal beams, and the post-cast bottom longitudinal beams are respectively connected to provide longitudinal support;
In the seventh step, the post-cast top longitudinal beam, the post-cast bottom longitudinal beam, the post-cast middle longitudinal beam, the upright post and the post-cast left middle plate are cast and formed in the left hole duct piece member by the embedded steel bars, the temporary side walls and the temporary supporting pieces, and the post-cast top longitudinal beam, the post-cast bottom longitudinal beam, the post-cast middle longitudinal beam, the upright post and the post-cast right middle plate are cast and formed in the right hole duct piece member, specifically:
Pouring and forming post-pouring top longitudinal beams and post-pouring bottom longitudinal beams at the embedded bars of the left hole duct piece member, pouring and forming post-pouring middle longitudinal beams at the side edges of the temporary supporting pieces of the left hole duct piece member, and pouring and forming upright posts between the post-pouring top longitudinal beams and the post-pouring middle longitudinal beams and between the post-pouring bottom longitudinal beams and the post-pouring middle longitudinal beams respectively; pouring and forming the post-pouring left middle plate in an area between the permanent side wall above the temporary support piece and the post-pouring middle longitudinal beam;
Pouring and forming post-pouring top longitudinal beams and post-pouring bottom longitudinal beams at the embedded bars of the right hole duct piece member, pouring and forming post-pouring middle longitudinal beams at the side edges of the temporary supporting pieces of the left hole duct piece member, and pouring and forming upright posts between the post-pouring top longitudinal beams and the post-pouring middle longitudinal beams and between the post-pouring bottom longitudinal beams and the post-pouring middle longitudinal beams respectively; pouring and forming the post-pouring right middle plate in an area between the permanent side wall above the temporary support piece and the post-pouring middle longitudinal beam;
Removing a non-supporting part of the temporary side wall, which is not connected with the temporary supporting piece, forming a first interval area between the remaining supporting parts of the temporary side wall, casting a half of post-cast middle plate in the first interval area by the temporary supporting piece, casting a half of post-cast top plate between post-cast top longitudinal beams of the first interval area, and casting a half of post-cast bottom plate between post-cast bottom longitudinal beams of the first interval area;
And step nine, removing the rest supporting parts of the temporary side walls, forming a second interval area between the middle plates of the post-cast middle part which is cast and formed, casting and forming the other half of the middle plates of the post-cast middle part, the top plate of the post-cast and the bottom plate of the post-cast in the mode of the step eight, and transversely penetrating through the top pipes by the middle plates of the left side of the post-cast, the middle plates of the right side of the post-cast, the middle plates of the post-cast and the longitudinal beams of the post-cast middle part, so that the left hole duct piece member and the right hole duct piece member are connected into a whole.
2. The structural conversion method for forming an integral subway station by using double-hole close-fitting jacking pipes as claimed in claim 1, wherein the structural conversion method comprises the following steps: the longitudinal length of each ring of the duct piece component is 2m.
3. The structural conversion method for forming an integral subway station by using double-hole close-fitting jacking pipes as claimed in claim 1, wherein the structural conversion method comprises the following steps: the top plate, the bottom plate and the permanent side wall are of a prefabricated reinforced concrete structure which is formed by integrally casting, the temporary side wall is formed by assembling grid steel plates, the temporary supporting piece is of a steel structure, and the top plate and the bottom plate are respectively connected with the temporary side wall through bolts.
4. The structural conversion method for forming an integral subway station by using double-hole close-fitting jacking pipes as claimed in claim 1, wherein the structural conversion method comprises the following steps:
The temporary side wall comprises a supporting part which is parallel to and connected with the temporary supporting piece and non-supporting parts which are positioned at two sides of the supporting part; the middle part of the supporting part of the temporary side wall extends to the side face to form a supporting face, and one end of the temporary supporting piece is arranged on the supporting face.
5. The structural conversion method for forming an integral subway station by using double-hole close-fitting jacking pipes as claimed in claim 1, wherein the structural conversion method comprises the following steps: the top plate and the bottom plate are also provided with pre-buried grouting pipes.
6. The structural conversion method for forming an integral subway station by using double-hole close-fitting jacking pipes as claimed in claim 1, wherein the structural conversion method comprises the following steps: in the second step, the construction of the pipe-jacking originating well and the receiving well specifically comprises the following steps:
measuring and lofting, and constructing shaft enclosures at two ends of a station;
leveling a field, and constructing a vertical shaft enclosure structure;
Digging a foundation pit dewatering well;
Excavating earthwork to construct a foundation pit support;
excavating to the designed elevation of the foundation pit bottom, and carrying out Shi Zuokeng bottom cushion layer;
And constructing a vertical shaft lining wall, wherein an originating hole is reserved in the jacking direction of the jacking pipe by the lining wall.
7. The structural conversion method for forming an integral subway station by using double-hole close-fitting jacking pipes as claimed in claim 1, wherein the structural conversion method comprises the following steps: in the second step, after the pipe jacking starting well and the receiving well are constructed, the ends of the starting well and the receiving well, which are jacked into the construction range, are subjected to jet grouting pile or stirring pile reinforcement.
8. The structural conversion method for forming an integral subway station by using double-hole close-fitting jacking pipes as claimed in claim 1, wherein the structural conversion method comprises the following steps: in the fourth step, pretensioning of the pipe joint steel strand is carried out during jacking construction; and after the protection pile in the head range of the top pipe of the receiving well is broken, the prestressed steel strand is tensioned until the design internal force is reached after the push bench is received.
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| CN202310266580.8A CN116446926B (en) | 2023-03-20 | 2023-03-20 | Structure conversion method for forming integral subway station by double-hole closely-attached jacking pipe |
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| JPH08165663A (en) * | 1994-12-14 | 1996-06-25 | Geostr Corp | Column member for underground structure |
| JP2003206697A (en) * | 2002-01-15 | 2003-07-25 | Kajima Corp | Construction method of underground structure |
| CN205260048U (en) * | 2016-01-05 | 2016-05-25 | 中国科学院武汉岩土力学研究所 | Penetrating rib formula arcading tunnel |
| CN106368716A (en) * | 2016-08-31 | 2017-02-01 | 中国铁建重工集团有限公司 | Muck transporter used for pipe-jacking construction method |
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2023
- 2023-03-20 CN CN202310266580.8A patent/CN116446926B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08165663A (en) * | 1994-12-14 | 1996-06-25 | Geostr Corp | Column member for underground structure |
| JP2003206697A (en) * | 2002-01-15 | 2003-07-25 | Kajima Corp | Construction method of underground structure |
| CN205260048U (en) * | 2016-01-05 | 2016-05-25 | 中国科学院武汉岩土力学研究所 | Penetrating rib formula arcading tunnel |
| CN106368716A (en) * | 2016-08-31 | 2017-02-01 | 中国铁建重工集团有限公司 | Muck transporter used for pipe-jacking construction method |
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