CN111577325A - Construction method for arch bridge type arc middle plate of underground excavation station - Google Patents
Construction method for arch bridge type arc middle plate of underground excavation station Download PDFInfo
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- CN111577325A CN111577325A CN202010314134.6A CN202010314134A CN111577325A CN 111577325 A CN111577325 A CN 111577325A CN 202010314134 A CN202010314134 A CN 202010314134A CN 111577325 A CN111577325 A CN 111577325A
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- 238000010276 construction Methods 0.000 title claims abstract description 111
- 238000009412 basement excavation Methods 0.000 title claims abstract description 16
- 238000009415 formwork Methods 0.000 claims abstract description 48
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000009432 framing Methods 0.000 claims abstract description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 6
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 6
- 241001330002 Bambuseae Species 0.000 claims description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 6
- 239000011425 bamboo Substances 0.000 claims description 6
- 239000011120 plywood Substances 0.000 claims description 6
- 230000002146 bilateral effect Effects 0.000 claims description 3
- 230000008520 organization Effects 0.000 description 8
- 238000013461 design Methods 0.000 description 3
- 230000005641 tunneling Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
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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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- 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
- E21D11/10—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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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Abstract
The invention provides a construction method of an arch bridge type arc middle plate of an underground excavation station, wherein the construction of the arch bridge type arc middle plate is divided into a plurality of construction sections, and each construction section comprises the following steps: s1) excavating the arch part of the station and constructing the lining of the arch cover; s2) excavating construction of the lower section of the station main body is completed by adopting a step method, and structural construction of part of side walls in the inverted arch and the side walls is completed; s3) erecting templates of the rest side walls in the side walls, and binding steel bars in the templates of the rest side walls; s4) adopting a formwork support with an arc middle plate erected on a full framing, erecting a formwork of the arc middle plate on the top surface of the formwork support, and binding reinforcing steel bars in the formwork of the arc middle plate; s5) pouring in the templates of the rest side walls and the templates of the arc middle plates in sequence; s6) erecting templates supported by straight section axillary angles of the rail top air duct part of the arc middle plate on the top surface of the arc middle plate and the top surfaces of the rest side walls; s7) pouring in the formwork of the straight section axillary angle support to form the straight section axillary angle support.
Description
Technical Field
The invention relates to the technical field of underground excavation station construction, in particular to a construction method of an arch bridge type arc middle plate of an underground excavation station.
Background
Along with the continuous development of city subway, the passenger is to each item functional demand of station promotion day by day, especially station platform public area, the passenger flow streamline is complicated, demand and the utilization ratio requirement to the space are high, the single (two) post that traditional station adopted, flat bottom medium plate, hang the mode in square rail top wind channel down, column network and medium plate, medium plate and rail top wind channel can't realize once only pouring, the loaded down with trivial details of construction, the process is complicated, the construction cycle is long, and the artificial cutting in public regional space of later stage column network, the space utilization ratio has greatly been reduced, be the difficult problem of a puzzlement site operation and later stage operation.
Disclosure of Invention
The invention provides a construction method of an arch bridge type arc middle plate of an underground excavation station, which cancels the traditional column net structure of the station, adopts transverse middle support, creates a large-space public area station layer, can perform one-time pouring to form a rail top air duct, reduces construction procedures, greatly improves construction efficiency, realizes reasonable and efficient organization arrangement of the internal structure of the station and mechanical tunneling, reduces construction organization difficulty and improves the overall construction quality of the station.
The invention provides a construction method of an arch bridge type arc middle plate of an underground excavation station, wherein the construction of the arch bridge type arc middle plate is divided into a plurality of construction sections, and for each construction section, the construction method comprises the following steps: s1) excavating the arch part of the station and constructing the lining of the arch cover; s2) excavating construction of the lower section of the station main body is completed by adopting a step method, and then structural construction of the inverted arch and part of side walls in the side walls is completed; s3) erecting templates of the rest side walls in the side walls, and binding steel bars in the templates of the rest side walls; s4) erecting a formwork support of the arc middle plate by using a full framing bracket according to the bottom profile of the designed arc middle plate, erecting a formwork of the arc middle plate on the top surface of the formwork support, and binding reinforcing steel bars in the formwork of the arc middle plate; s5) pouring in the templates of the residual side walls and the arc middle plates in sequence to form the residual side walls and the arc middle plates; s6) erecting a template supported by straight section axillary angles of the rail top air channel part of the arc middle plate on the top surface of the formed arc middle plate and the top surfaces of the rest side walls; s7) pouring in the formwork of the straight section axillary angle support to form the straight section axillary angle support.
Preferably, in the step S1), in the lining construction of the arch cover, at an interface between the arch cover and the side wall lining, a slope triangular lining interface capable of being densely poured with interface concrete of the side wall lining is reserved.
Preferably, in the step S2), the structure construction of the inverted arch includes filling construction of the inverted arch; the construction height of the partial side wall is higher than the rail top elevation of the inverted arch by a preset distance.
Preferably, in the step S3), erecting templates of the remaining side walls in the side walls by using small steel molds and i-beams, where the height of the templates of the remaining side walls is higher than the height of the edges at the two ends of the templates of the arc-shaped middle plate.
Preferably, in the step S4), the arc middle plate has a bottom arc profile with a horizontal middle part and two ends inclined downwards at a predetermined angle.
Preferably, in the step S4), a bamboo plywood, a square timber and a double steel pipe are combined to form the formwork of the arc-shaped middle plate.
Preferably, the step S5) includes pouring in a formwork of the arc-shaped middle plate to form the arc-shaped middle plate, including: and performing bilateral symmetry pouring from the two end parts of the arc middle plate with the lowest elevation of the template to the middle part to form the arc middle plate.
Preferably, in step S6), the straight section axillary corner supporting template includes a straight section connected to the horizontal section of the arc middle plate and an axillary corner section connected to the top surface of the remaining sidewall.
Preferably, in the step S6), a formwork for supporting the straight section axillary angle is built by using bamboo plywood and square timber.
Preferably, after the step S7), the construction method further includes: and curing the arc middle plate, the residual side walls and the concreting of the straight section axillary angle support, and after curing is completed, removing the templates of the arc middle plate, the templates of the residual side walls, the templates of the straight section axillary angle support and the template support.
The invention provides a construction method of an arch bridge type arc middle plate of a subsurface excavated station, which comprises the following steps of firstly completing excavation of an arch part of the station and lining construction of an arch cover; then, completing the structural construction of the inverted arch and part of the side wall in the side wall; building templates of the rest side walls in the side walls; a formwork support for erecting the arc-shaped middle plate is erected by adopting a full framing support, so that construction conditions are provided for the formwork for erecting the arc-shaped middle plate; pouring in the templates of the residual side walls and the templates of the arc-shaped middle plates in sequence to form the residual side walls and the arc-shaped middle plates, and ensuring the integral stability of the structures of the arc-shaped middle plates and the side walls after pouring; the template of the straight section axillary angle support of the rail top air channel part of the arc middle plate can be erected by utilizing the formed top surface of the arc middle plate and the top surfaces of the residual side walls, pouring is carried out in the template of the straight section axillary angle support to form the straight section axillary angle support, the straight section axillary angle support and the two ends of the arc middle plate form the rail top air channel, the problem that secondary pouring is needed for forming the rail top air channel in the later stage is solved, the construction procedures are reduced, the construction efficiency is improved, reasonable and efficient organization arrangement of the station internal structure and mechanical tunneling is realized, the construction organization difficulty is reduced, and the integral construction quality of the station is also improved.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 is a flowchart illustrating steps of a construction method of an arch bridge type arc-shaped middle plate of an underground excavation station according to an embodiment of the present invention;
fig. 2 is a longitudinal sectional view of the underground excavated station of steps S1, S2 in the underground excavated station arch bridge type arc middle plate construction method according to the embodiment of the present invention;
fig. 3 is a longitudinal sectional view of the underground excavated station of steps S3, S4, S5 in the underground excavated station arch bridge type arc-shaped middle plate construction method according to the embodiment of the present invention;
fig. 4 is a longitudinal sectional view of the underground excavated station of steps S6, S7 in the underground excavated station arch type arc middle plate construction method according to the embodiment of the present invention.
Description of the reference numerals
1 arch cover 2 inverted arch
3 part side wall 4 arc middle plate
5 template support 6 residual side wall
7 straight section axillary angle support
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
The technical solution in the embodiments of the present invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 4, the present invention provides a construction method of an arch bridge type arc middle plate of an underground excavation station, the construction of the arch bridge type arc middle plate is divided into a plurality of construction sections, and the construction method is characterized in that for each construction section, the construction method comprises the following steps: s1) excavating the arch part of the station and constructing the lining of the arch cover 1; s2) excavating construction of the lower section of the station main body is completed by adopting a step method, and then structural construction of the inverted arch 2 and part of the side walls 3 in the side walls is completed; s3) erecting templates of the rest side walls 6 in the side walls, and binding steel bars in the templates of the rest side walls 6; s4) erecting a formwork support 5 of the arc middle plate 4 by using a full framing bracket according to the designed bottom profile of the arc middle plate 4, erecting a formwork of the arc middle plate 4 on the top surface of the formwork support 5, and binding reinforcing steel bars in the formwork of the arc middle plate 4; s5) pouring in the templates of the residual side walls 6 and the arc middle plates 4 in sequence to form the residual side walls 6 and the arc middle plates 4; s6) erecting a template of a straight section axillary angle support 7 of the rail top air channel part of the arc middle plate 4 on the top surface of the formed arc middle plate 4 and the top surfaces of the residual side walls 6; s7) pouring in the formwork of the straight section axillary corner support 7 to form the straight section axillary corner support 7.
The mode that single (two) post, flat bottom medium plate, the square rail top wind channel of hanging down that traditional station adopted, the column net can't realize once only pouring with medium plate, medium plate and rail top wind channel, and the construction is loaded down with trivial details, and the process is complicated, and the construction cycle is long, and later stage column net is with the artificial cutting in public area space, greatly reduces space utilization, is the difficult problem of a puzzlement site operation and later stage operation. According to the technical scheme, the traditional column net structure of the station is omitted, the arc middle plate 4 is used for providing middle support, a large-space public area station layer is created, the construction efficiency is greatly improved, and the integral construction quality of the station is improved.
According to the technical scheme, the invention provides a construction method of an arch bridge type arc middle plate of an underground excavation station, wherein the construction of the underground excavation station is divided into a plurality of construction sections, and the construction method of each construction section comprises the steps of S1) completing the excavation of an arch part of the station and the lining construction of an arch cover 1; and provides guarantee for subsequent construction.
According to an embodiment of the present invention, preferably, in the step S1), in the lining construction of the arch cover 1, a slope triangular lining interface capable of being densely poured with interface concrete of a side wall lining is reserved at an interface between the arch cover 1 and the side wall lining, so as to ensure that the side wall lining and the arch cover 1 can be densely poured, and further ensure the construction quality.
According to the technical scheme of the invention, step S2) adopts a step method to finish the excavation construction of the lower section of the station main body, and then the structural construction of the inverted arch 2 and part of the side walls 3 in the side walls is finished; the partial side wall 3 and the inverted arch 2 can be constructed synchronously, so that the construction time is shortened, and the construction efficiency is improved.
According to an embodiment of the present invention, in the step S2), the structural construction of the inverted arch 2 includes filling construction of the inverted arch 2; the construction height of the partial side wall 3 is higher than the rail top elevation of the inverted arch 2 by a preset distance. Preferably, the predetermined distance is 50cm, so that the top surface of the partial side wall 3 is flat, a foundation is laid for subsequent construction, and the construction efficiency is improved.
According to the technical scheme of the invention, step S3) is carried out to set up the templates of the rest side walls 6 in the side walls, and steel bars are bound in the templates of the rest side walls 6; and connecting binding steel bars in the templates of the residual side walls 6 with binding steel bars in the templates of the arc middle plates 4 to prepare for pouring, so that the arc middle plates 4 and the residual side walls 6 have integral stability after pouring.
According to an embodiment of the present invention, in step S3), the templates of the remaining side walls 6 in the side walls are built by using small steel molds and i-beams, and the height of the templates of the remaining side walls 6 is higher than the height of the edges of the two ends of the templates of the arc-shaped middle plate 4. Preferably, the height of the templates of the remaining side walls 6 is 10cm higher than the edges of the two ends of the templates of the arc middle plate 4, so that the junction of the side walls and the arc middle plate 4 can be completely and compactly poured.
According to the technical scheme of the invention, step S4) is to adopt a full hall bracket to erect the formwork support 5 of the arc middle plate 4 according to the bottom profile of the designed arc middle plate 4, to erect the formwork of the arc middle plate 4 on the top surface of the formwork support 5, and to bind the reinforcing steel bars in the formwork of the arc middle plate 4. And determining the height of the upright stanchion according to the bottom profile of the arc middle plate 4, ensuring that the profile of the formwork support 5 is matched with the bottom profile of the arc middle plate 4, and providing construction conditions for the formwork for erecting the arc middle plate 4 so as to form the formwork of the arc middle plate 4 meeting the design requirements.
According to an embodiment of the present invention, preferably, in the step S4), the arc middle plate 4 has a bottom arc profile with a horizontal middle part and two downward-inclined ends at a predetermined angle, and is an arch bridge type arc structure, and the arch bridge type arc structure can convert a vertical load into a horizontal thrust and transmit the thrust to the side wall, so that the arc middle plate 4 can be used as a large-span support of the station, thereby enabling to cancel a network, creating a large-space public area station layer, and improving the overall construction quality of the station.
According to an embodiment of the present invention, in step S4), a bamboo plywood, square timber and double steel pipes are combined to form a formwork of the arc-shaped middle plate 4, so that the formwork is firm in structure and can be poured to form the arc-shaped middle plate 4 meeting design requirements. Preferably, the square timber is 90mm by 90mm square timber, and has enough bearing capacity, so that the erected formwork is firm and reliable.
According to the technical scheme of the invention, step S5) is performed to pour in the templates of the residual side walls 6 and the templates of the arc-shaped middle plates 4 in sequence to form the residual side walls 6 and the arc-shaped middle plates 4, so that the stability of the whole structure of the arc-shaped middle plates 4 and the side walls after pouring is ensured.
According to an embodiment of the present invention, the step S5) includes pouring in a formwork of the arc-shaped middle plate 4 to form the arc-shaped middle plate 4, including: and performing bilateral symmetry pouring from the two end parts of the lowest template elevation of the arc middle plate 4 to the middle part to form the arc middle plate 4. Preferably, a concrete tank truck and a ground pump are adopted for pouring, the pouring rising condition needs to be observed at any time in the pouring process, and the pouring speed needs to be controlled according to the actual condition; and an insertion vibrator is adopted for vibrating operation so as to ensure the appearance quality of pouring.
According to the technical scheme of the invention, step S6) is carried out to set up a template of a straight section axillary angle support 7 of the rail top air channel part of the arc middle plate 4 on the top surface of the formed arc middle plate 4 and the top surfaces of the residual side walls 6; can utilize to form the top surface of arc medium plate 4 with the top surface of surplus side wall 6 is set up, makes right can form the rail top wind channel after the template of straight section axillary angle support 7 is pour, has avoidd the later stage and need carry out the secondary and pour the problem for forming the rail top wind channel, has reduced construction process, has promoted the efficiency of construction, also greatly reduced artificial construction joint and reached arc medium plate 4 trompil risk, improve the construction quality and the self-waterproof ability of concrete.
According to an embodiment of the present invention, in the step S6), the straight section axillary corner supports 7 preferably include a straight section connected to the horizontal section of the arc middle plate 4 and an axillary corner section connected to the top surface of the remaining sidewall 6. Because the two ends of the arc middle plate 4 are inclined downwards at a preset angle, after the formwork of the straight section axillary angle support 7 is poured, a rail top air channel is formed between the formwork and the two ends of the arc middle plate 4, the problem that secondary pouring is needed for forming the rail top air channel in the later stage is avoided, the construction procedures are reduced, and the construction efficiency is improved.
According to an embodiment of the present invention, in step S6), a formwork for the straight section axillary angle supports 7 is preferably constructed by using bamboo plywood and square timber. The longitudinal distance between the square timbers is 300mm, the transverse distance between the square timbers is 1000mm, the distance between the square timbers and the axillary position (namely the position connected with the side wall and the arch cover 1) is 500mm, the square timbers are tightly nailed by nails, and a larger operation space is reserved as much as possible under the condition of permission of conditions, so that a better operation space is provided for subsequent form removal; and finishing the binding of the steel bars in the template of the straight section axillary angle support 7 and preparing for pouring.
According to the technical scheme of the invention, step S7) is performed to pour in the template of the straight section axillary angle support 7 to form the straight section axillary angle support 7, the straight section axillary angle support 7 and two ends of the arc middle plate 4 form a rail top air duct, so that the problem that secondary pouring is required to be performed to form the rail top air duct in the later stage is avoided, the rationalized and efficient organization arrangement of the internal structure and mechanical tunneling of a station is realized, the construction organization difficulty is reduced, and the construction quality is also improved.
According to an embodiment of the present invention, after step S7), the construction method further includes: and curing the cast concrete of the arc middle plate 4, the residual side walls 6 and the straight section axillary angle supports 7, and removing the templates of the arc middle plate 4, the templates of the residual side walls 6, the templates of the straight section axillary angle supports 7 and the template supports 5 after curing is finished. Specifically, the concrete can be orderly organized and demoulded after the solidification reaches 70% of the design so as to prevent the demoulding difficulty; when demoulding, the template of the straight section axillary angle support 7 is firstly removed, and the template is sequentially removed from outside to inside and transported backwards; after the axillary corner is removed, the template of the arc-shaped middle plate 4, the template of the residual side wall 6 and the template support 5 are sequentially removed according to the principles of first support and then removal, second support and first removal, first non-bearing part and second bearing part and from top to bottom.
The invention aims to provide a construction method of an arch bridge type arc middle plate of a subsurface excavated station, which comprises the following steps of firstly completing excavation of an arch part of the station and lining construction of an arch cover 1; then, completing the structural construction of the inverted arch 2 and part of the side wall 3 in the side wall; building templates of the rest side walls 6 in the side walls; a formwork support 5 for erecting the arc-shaped middle plate 4 is erected by adopting a full framing support, so that construction conditions are provided for a formwork for erecting the arc-shaped middle plate 4; pouring in the templates of the residual side walls 6 and the templates of the arc-shaped middle plates 4 in sequence to form the residual side walls 6 and the arc-shaped middle plates 4, so as to ensure the stability of the whole structure of the arc-shaped middle plates 4 and the side walls after pouring; the template of the straight section axillary angle support 7 of the rail top air channel part of the arc middle plate 4 can be erected by utilizing the formed top surface of the arc middle plate 4 and the top surface of the residual side wall 6, pouring is carried out in the template of the straight section axillary angle support 7 to form the straight section axillary angle support 7, the straight section axillary angle support 7 and the two ends of the arc middle plate 4 form a rail top air channel, the problem that secondary pouring is needed for forming the rail top air channel in the later period is avoided, the construction process is reduced, the construction efficiency is improved, the rationalization and efficient organization arrangement of the internal structure and the machinery of the station is realized, the construction organization difficulty is reduced, and the integral construction quality of the station is also improved.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (10)
1. A construction method of an arch bridge type arc middle plate of an underground excavation station is provided, the construction of the arch bridge type arc middle plate is divided into a plurality of construction sections, and the construction method is characterized by comprising the following steps for each construction section:
s1) excavating the arch part of the station and constructing the lining of the arch cover (1);
s2) excavating construction of the lower section of the station main body is completed by adopting a step method, and then structural construction of the inverted arch (2) and part of the side walls (3) in the side walls is completed;
s3) erecting templates of the rest side walls (6) in the side walls, and binding steel bars in the templates of the rest side walls (6);
s4) erecting a formwork support (5) of the arc middle plate (4) by using a full framing support according to the designed bottom profile of the arc middle plate (4), erecting a formwork of the arc middle plate (4) on the top surface of the formwork support (5), and binding reinforcing steel bars in the formwork of the arc middle plate (4);
s5) pouring in the templates of the residual side walls (6) and the arc middle plates (4) in sequence to form the residual side walls (6) and the arc middle plates (4);
s6) erecting a template of a straight section axillary angle support (7) of the rail top air channel part of the arc middle plate (4) on the top surface of the formed arc middle plate (4) and the top surfaces of the rest side walls (6);
s7) pouring in the formwork of the straight section axillary corner support (7) to form the straight section axillary corner support (7).
2. The construction method according to claim 1, wherein in step S1), in lining construction of the arch cover (1), a slope triangular lining interface capable of being poured densely with interface concrete of a side wall lining is reserved at an interface between the arch cover (1) and the side wall lining.
3. The construction method according to claim 1, wherein in the step S2), the structural construction of the inverted arch (2) comprises a filling construction of the inverted arch (2);
the construction height of the partial side wall (3) is higher than the rail top elevation of the inverted arch (2) by a preset distance.
4. The construction method according to claim 1, wherein in the step S3), a small steel die and an i-beam are used to erect a formwork of the remaining side wall (6) of the side walls, and the height of the formwork of the remaining side wall (6) is higher than the height of the edges of the two ends of the formwork of the arc-shaped middle plate (4).
5. The construction method as claimed in claim 1, wherein the arc-shaped middle plate (4) has a bottom arc-shaped profile having a horizontal middle portion and two ends inclined downward at a predetermined angle at the step S4).
6. The construction method according to claim 5, wherein in the step S4), a bamboo plywood, a square timber and a double steel pipe are combined to form a formwork of the arc-shaped middle plate (4).
7. The construction method according to claim 1, wherein the step S5) comprises pouring in a formwork of the arc-shaped middle plate (4) to form the arc-shaped middle plate (4), and comprises the following steps:
and performing bilateral symmetry pouring from the two end parts of the lowest template elevation of the arc middle plate (4) to the middle part to form the arc middle plate (4).
8. The construction method according to claim 1, wherein in the step S6), the formwork of the straight section axillary corner support (7) comprises a straight section connected with the horizontal section of the arc middle plate (4) and an axillary corner section connected with the top surface of the remaining side wall (6).
9. The construction method according to claim 8, wherein in step S6), bamboo plywood and square timber are used to build up the formwork of the straight section axillary angle support (7).
10. The construction method according to claim 1, wherein after step S7), the construction method further comprises:
and curing the cast concrete of the arc middle plate (4), the residual side walls (6) and the straight section axillary angle supports (7), and after curing is completed, removing the templates of the arc middle plate (4), the templates of the residual side walls (6), the templates of the straight section axillary angle supports (7) and the template supports (5).
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| CN112706269A (en) * | 2020-12-24 | 2021-04-27 | 中交第四航务工程局有限公司 | Construction method for top plate of sealed space at top of immersed tube |
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