CN209873860U - Two-sided coincide side fascia of integral utility tunnel of environment-friendly prefabricated assembly - Google Patents
Two-sided coincide side fascia of integral utility tunnel of environment-friendly prefabricated assembly Download PDFInfo
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- CN209873860U CN209873860U CN201920071752.5U CN201920071752U CN209873860U CN 209873860 U CN209873860 U CN 209873860U CN 201920071752 U CN201920071752 U CN 201920071752U CN 209873860 U CN209873860 U CN 209873860U
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Abstract
The utility model discloses a two-sided coincide side fascia of integral utility tunnel of environment-friendly prefabricated assembly, include: the space between the outer side wall plate and the inner side wall plate forms a pouring cavity for pouring the first cast-in-place section, and the pouring cavity is provided with truss steel bars; the outer side wall plate comprises a first steel reinforcement framework and a first concrete layer wrapping the first steel reinforcement framework; the inner side wall board comprises a second steel reinforcement framework and a second concrete layer wrapping the second steel reinforcement framework; one end of the truss steel bar is connected with the first steel bar framework; the other end of the truss steel bar is connected with the second steel bar framework; and anchoring steel bars extending to the second cast-in-place section are respectively embedded at two ends of the wallboard along the height direction, and the extending direction of the anchoring steel bars is perpendicular to the wallboard. The utility model discloses an external wall panel quality is light, transportation, hoist and mount and simple to operate, and the construction speed is fast, and the comprehensive cost is low, can exempt from the mould to pour, and structural integrity is good, and the site operation pollutes for a short time.
Description
Technical Field
The utility model relates to a utility tunnel technical field indicates a two-sided coincide side fascia of integral utility tunnel of environment-friendly prefabricated assembly especially.
Background
The utility tunnel is built in the city underground and holds two kinds and above municipal pipelines in box culvert tunnel of an organic whole. The urban engineering pipelines of water supply, natural gas, heat, power, communication and the like can be brought into the urban engineering pipelines, the unification of planning, construction and management is realized, and the urban engineering pipelines are important infrastructures and 'life lines' for guaranteeing urban operation. Traditional urban underground pipelines are laid in shallow spaces of roads respectively, the phenomenon of 'zipper roads' is caused due to the fact that the pipelines are increased in capacity, accidents of the pipelines occur frequently, the road surfaces are dug for many times, maintenance cost is increased, and safe operation of the cities is greatly influenced.
The utility tunnel is widely applied as an urban municipal infrastructure, is especially widely popularized in countries in the last two years, and is well-established in various regions. At present, most of the built or under-built partial underground comprehensive pipe galleries are cast in place and are cast in a factory into a whole by centrifugation or vibration to be delivered to a construction site. Both of these methods have significant disadvantages: the cast-in-place box culvert has long construction period, high labor intensity, low efficiency, great influence by weather and field conditions, great pollution to the surrounding environment, unstable construction quality, high cost and pollution to soil; the whole box culvert of batch production, the piping lane shaping is long, and the process steps are loaded down with trivial details, and construction cost is high, and transportation, hoist and mount difficulty, especially large-scale box culvert, production facility and hoisting equipment drop into greatly, and the box culvert of super large specification is difficult to have production facility also can't make.
Disclosure of Invention
The utility model aims at providing a two-sided coincide side fascia of integral utility tunnel of prefabricated assembly of environment-friendly, this side fascia batch production and quality are light, and transportation, hoist and mount are all convenient and the site operation is little to the pollution of soil (this side fascia need not cast-in-place shaping, the on-the-spot construction can), and the construction speed is fast, and the combined cost is low, can realize exempting from the mould to pour, and structural integrity is good, and structural strength is high and shear behavior is superior.
The utility model provides a technical scheme as follows:
the utility model provides a two-sided coincide side fascia of integral utility tunnel of environment-friendly prefabricated assembly, includes:
the two wallboards are arranged in parallel, namely an outer wallboard forming the outer side wall of the comprehensive pipe gallery and an inner wallboard forming the inner side wall of the comprehensive pipe gallery;
a pouring cavity for pouring a first cast-in-place section is formed in a space between the outer side wall plate and the inner side wall plate, and truss steel bars are arranged in the pouring cavity;
the outer side wall board comprises a first steel reinforcement framework and a first concrete layer wrapping the first steel reinforcement framework;
the inner side wall board comprises a second steel reinforcement framework and a second concrete layer wrapping the second steel reinforcement framework;
one end of the truss steel bar is connected with the first steel bar framework; the other end of the truss steel bar is connected with the second steel bar framework;
and anchoring steel bars extending to the second cast-in-place section are respectively embedded at two ends of the wallboard along the height direction, and the extending direction of the anchoring steel bars is perpendicular to the wallboard.
In the technical scheme, the two wallboards are arranged inside and outside, the two wallboards which are arranged in parallel are connected through the truss steel bars, and the pouring cavity of the first cast-in-place section is formed between the two wallboards, so that the quality of the external wallboard is greatly reduced, the transportation, the hoisting and the installation of the external wallboard are facilitated, the pollution to soil caused by field construction is small (the external wallboard does not need cast-in-place forming and can be built on site), the factory batch production can be realized, and the process steps are simple and easy to realize; the outer side wall plate and the inner side wall plate form a template of the first cast-in-place section, so that no additional template is needed when the first cast-in-place section is cast in place, construction is easy, the field labor intensity is low, the construction period is short, and the efficiency is high; more preferably, the arrangement of the truss reinforcing steel bars greatly increases the structural strength and the shear resistance of the wall board forming the left side wall or the right side wall of the comprehensive pipe gallery (the truss reinforcing steel bars are connected with the first reinforcing steel bar framework and the second reinforcing steel bar framework, the integrity and the integration of the outer side wall board, the first cast-in-place section and the inner side wall board are improved), the left side wall or the right side wall of the comprehensive pipe gallery has no tensile stress, the arrangement of a waterproof structure of the left side wall or the right side wall of the comprehensive pipe gallery is omitted, and the earth excavation and backfill amount are reduced; more excellent, the setting of anchor reinforcing bar has improved the firm in connection nature and the stability of this wallboard with the cast-in-place section of second, improves the shear resistance of this wallboard and cast-in-place section contact department to guarantee utility tunnel's the structural strength requirement of last lateral wall and lower lateral wall and the bearing performance that shears.
Further preferably, the plurality of truss reinforcing steel bars are arranged in a Z shape along the height direction.
Among this technical scheme, the end to end connection of truss reinforcing bar has increased the wholeness and the structural strength of first cast-in-place section, and then has increased the cohesiveness of outer side wall board, first cast-in-place section and inboard wallboard and the steadiness and the fastness of connection to improve utility tunnel's left side wall or right side wall's structural strength.
Further preferably, the anchoring bar is provided to the outer and/or inner wall panels.
Among this technical scheme, on anchor reinforcing bar can set up outer panel, inboard wallboard, outer panel and inboard wallboard as required, specifically can set up according to actual need, the practicality is strong, extensive applicability.
Further preferably, the outer side wall panel is larger in size in the height direction than the inner side wall panel; the anchoring reinforcing steel bar is formed by extending the first reinforcing steel bar framework after being bent, and the second reinforcing steel bar framework is connected with the anchoring reinforcing steel bar.
Among this technical scheme, the anchor reinforcing bar sets up with first framework of steel reinforcement is integrative, and the anchor reinforcing bar is connected with second framework of steel reinforcement, thereby make first framework of steel reinforcement, second framework of steel reinforcement, truss reinforcing bar and anchor reinforcing bar realize the integration, thereby make whole utility tunnel's left side wall, the right side wall, go up lateral wall and lower lateral wall integration, only be pouring time's difference, utility tunnel's overall structure intensity has been improved greatly, prefabricated formula utility tunnel's atress equilibrium has been improved, utility tunnel's life has been prolonged. Preferably, the inner side wall plate is lower than the outer side wall plate, so that the second cast-in-place section is free from being picked.
Further preferably, the outer side wall panel is larger in size in the height direction than the inner side wall panel; the anchoring steel bar is formed by bending and extending the first steel bar framework; the anchoring steel bar is formed by extending the bent second steel bar framework.
Among this technical scheme, the anchor reinforcing bar is buckled to form by first framework of steel reinforcement and second framework of steel reinforcement respectively, because the outside wall plate size is greater than the inside wall plate size to make the anchor reinforcing bar be two rows of settings along the direction of height in proper order, the multirow setting of anchor reinforcing bar has improved the bearing capacity that shears of cast-in-place section, has improved the structural strength and the shear resistance of utility tunnel's last lateral wall and the junction of lower lateral wall and utility tunnel's left side wall or right side wall simultaneously. Preferably, the inner side wall plate is lower than the outer side wall plate, so that the second cast-in-place section is free from being picked.
Further preferably, the anchoring reinforcing bars are arranged in an array.
Among this technical scheme, the array setting of anchor reinforcing bar has improved the bearing capacity that shears of cast-in-place section, has improved the structural strength and the shear resistance of utility tunnel's last lateral wall and the junction of lower lateral wall and utility tunnel's left side wall or right side wall simultaneously.
Further preferably, the anchoring reinforcing bar is the crotch structure, including straightway and crotch section, the straightway is close to the wallboard setting, the terminal orientation of crotch section the wallboard.
In the technical scheme, the anchoring reinforcing steel bars are arranged in a hook shape, so that the connection strength of the second cast-in-place section and the external wall panel is improved, the bending resistance of the second cast-in-place section is improved, and the structural strength of the second cast-in-place section is improved.
Further preferably, the anchoring reinforcing steel bar is of a linear structure, and an anchoring plate is arranged at the tail end of one side, far away from the wallboard, of the anchoring reinforcing steel bar.
In the technical scheme, the arrangement of the anchoring plate improves the connection strength of the second cast-in-place section and the external wall panel, improves the bending resistance of the second cast-in-place section, and improves the structural strength of the second cast-in-place section.
The utility model provides a pair of two-sided coincide side fascia of integral utility tunnel of environment-friendly prefabricated assembly can bring following at least one beneficial effect:
1. in the utility model, the two wallboards are arranged inside and outside, the two wallboards arranged in parallel are connected through the truss steel bars, and the pouring cavity of the first cast-in-place section is formed between the two wallboards, so that the quality of the external wallboard is greatly reduced, the external wallboard is convenient to transport, hoist and mount, the factory batch production can be realized, the process steps are simple and easy to realize, and the pollution of field construction to soil is small (the external wallboard does not need cast-in-place forming, and the field construction can be realized); the outer side wall plate and the inner side wall plate form a template of the first cast-in-place section, so that no additional template is needed when the first cast-in-place section is cast in place, construction is easy, the field labor intensity is low, the construction period is short, and the efficiency is high; more preferably, the arrangement of the truss reinforcing steel bars greatly increases the structural strength and the shear resistance of the wall board forming the left side wall or the right side wall of the comprehensive pipe gallery (the truss reinforcing steel bars are connected with the first reinforcing steel bar framework and the second reinforcing steel bar framework, the integrity and the integration of the outer side wall board, the first cast-in-place section and the inner side wall board are improved), the left side wall or the right side wall of the comprehensive pipe gallery has no tensile stress, the arrangement of a waterproof structure of the left side wall or the right side wall of the comprehensive pipe gallery is omitted, and the earth excavation and backfill amount are reduced; more excellent, the setting of anchor reinforcing bar has improved the firm in connection nature and the stability of this wallboard with the cast-in-place section of second, improves the shear resistance of this wallboard and cast-in-place section contact department to guarantee utility tunnel's the structural strength requirement of last lateral wall and lower lateral wall and the bearing performance that shears.
2. The utility model discloses in, the anchor reinforcing bar sets up with first framework of steel reinforcement is integrative, and the anchor reinforcing bar is connected with second framework of steel reinforcement, thereby make first framework of steel reinforcement, second framework of steel reinforcement, truss reinforcing bar and anchor reinforcing bar realize the integration, thereby make whole utility tunnel's left side wall, right side wall, go up lateral wall and lower lateral wall integration, only be pouring time's difference, the overall structure intensity of utility tunnel has been improved greatly, prefabricated formula utility tunnel's atress equilibrium has been improved, utility tunnel's life has been prolonged. Preferably, the inner side wall plate is lower than the outer side wall plate, so that the second cast-in-place section is free from being picked.
Drawings
The above features, technical features, advantages and means of realisation of the environmentally friendly prefabricated and assembled integral type double-sided laminated side fascia will be further described in detail with reference to the accompanying drawings, which are well understood and described in detail.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a front view structural schematic of FIG. 1;
fig. 3 is a schematic view of a cross-sectional structure of an embodiment of the present invention after pouring.
The reference numbers illustrate:
1. the concrete structure comprises an outer side wall plate, 2 truss steel bars, 3 inner side wall plates, 31 pouring cavities, 32 second steel bar frameworks, 4 anchoring steel bars, 41 straight line sections, 42 hook sections, 5 first cast-in-place sections, 6 second cast-in-place sections, 7 cushion layers, 8 supporting plates and 9 supporting steel bars.
Detailed Description
In order to more clearly illustrate embodiments of the present invention or technical solutions in the prior art, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is obvious that the drawings in the following description are only examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be obtained from these drawings without inventive effort.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure of the product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one". In this context, it is to be understood that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In this document, upper, lower, left and right refer to upper, lower, left and right of the described drawings, and do not fully represent reality.
In one embodiment, as shown in fig. 1 to 3, an environmentally friendly prefabricated assembled integral type double-sided laminated external wall panel for utility tunnel comprises: the system comprises two wallboards which are arranged in parallel, namely an outer wallboard 1 forming the outer side wall of the comprehensive pipe gallery and an inner wallboard 3 forming the inner side wall of the comprehensive pipe gallery; a pouring cavity 31 for pouring the first cast-in-place section 5 is formed in the space between the outer side wall plate 1 and the inner side wall plate 3, and truss steel bars 2 are arranged in the pouring cavity 31; the outer side wall plate 1 comprises a first steel reinforcement framework and a first concrete layer wrapping the first steel reinforcement framework; the inner side wall plate 3 comprises a second steel reinforcement framework 32 and a second concrete layer wrapping the second steel reinforcement framework 32; one end of the truss steel bar 2 is connected with the first steel bar framework; the other end of the truss steel bar 2 is connected with a second steel bar framework 32; the two ends of the wallboard along the height direction are respectively embedded with an anchoring reinforcing steel bar 4 extending to the second cast-in-situ section 6, and the extending direction of the anchoring reinforcing steel bar 4 is perpendicular to the wallboard. In practical application, the mill can build the back with first framework of steel reinforcement, second framework of steel reinforcement 32 and truss reinforcing bar 2, thereby alright carry out pouring of concrete to first framework of steel reinforcement and second framework of steel reinforcement 32 and make first framework of steel reinforcement and concrete form outer side wall board 1, second framework of steel reinforcement 32 and concrete form inboard wallboard 3, and truss reinforcing bar 2 sets up in pouring chamber 31 between outer side wall board 1 and inboard wallboard 3, realize outer side wall board 1 and inboard wallboard 3's connection. After this side fascia on-site hoisting finishes, thereby alright pour cavity 31 and form utility tunnel's left side wall and right side wall, anchor reinforcing bar 4 between two this side fascia to relative setting carries out the site pouring, thereby realize utility tunnel's last lateral wall and lower lateral wall, in practical application, because utility tunnel's left side wall, the right side wall, go up the lateral wall and all can the site pouring of lower lateral wall, consequently, two adjacent this side fascia accessible cast-in-place sections (being first cast-in-place section 5 and the cast-in-place section 6 of second) of arranging along utility tunnel's length direction realize connecting, and then avoid the setting of the coupling assembling of two adjacent this side fascia that arrange along utility tunnel's length direction.
In the second embodiment, as shown in fig. 1 to 3, a plurality of truss reinforcing bars 2 are arranged in a zigzag shape in the height direction on the basis of the first embodiment. Of course, in practical application, many truss reinforcing bars 2 still can be parallel to each other set up, perhaps parallel simultaneously and be the Z style of calligraphy and arrange, of course, truss reinforcing bar 2 also can be the X style of calligraphy and arrange, arrange all can not even regularly, specifically can set up according to actual need. Preferably, the thickness of the outer wall board 1 and the inner wall board 3 is 50-100 mm, and the outer wall board 1 is higher than the inner wall board by 3500-800 mm.
In the third embodiment, as shown in fig. 1 to 3, on the basis of the first or third embodiment, the anchoring bar 4 is provided on the outer side wall panel 1 and/or the inner side wall panel 3. Preferably, the outer side wall panel 1 is larger in size in the height direction than the inner side wall panel 3; the anchoring reinforcement 4 is formed by the first steel reinforcement framework after being bent and extended, and the second steel reinforcement framework 32 is connected with the anchoring reinforcement 4. Of course, in practical application, the second steel skeleton 32 may not be connected to the anchoring steel bar 4, but may be embedded in the second concrete layer, and the anchoring steel bar 4 is not formed by bending the first steel skeleton, but extends to the second cast-in-place section 6 after being connected to the first steel skeleton. The anchoring bar 4 may also be formed by bending the second steel skeleton 32, and the first steel skeleton is embedded in the first concrete layer. Preferably, the anchoring reinforcing bars 4 are arranged in an array manner, for example, the anchoring reinforcing bars 4 are formed by bending a first reinforcing bar framework and a second reinforcing bar framework 32, and the anchoring reinforcing bars 4 can be formed by bending a part of the first reinforcing bar framework and the second reinforcing bar framework 32, preferably, the first reinforcing bar framework and the second reinforcing bar framework 32 which do not form the anchoring reinforcing bars 4 can be connected with the anchoring reinforcing bars 4 or embedded in the first concrete layer or the second concrete layer without being connected with the anchoring reinforcing bars 4. And the anchoring reinforcing bars 4 formed by bending the first and second reinforcing bars 32 may be arranged in two rows or in one row along the height direction (i.e., the up-down direction). The plural rows (two or more rows) of the anchoring rebars 4 arranged in the height direction may be formed only by the first or second cages 32. Preferably, the anchoring bar 4 is a hook structure, comprising a straight section 41 and a hook section 42, the straight section 41 being arranged close to the wall panel, the end of the hook section 42 facing the wall panel. Of course, the anchoring bars 4 may also be simply rectilinear bars; or the anchoring steel bar 4 is a straight steel bar, but the tail end of one side of the anchoring steel bar 4, which is far away from the wall board, is provided with an anchoring plate, and the extension direction of the anchoring plate can be parallel to the height direction or simultaneously perpendicular to the height direction and the length direction of the anchoring steel bar 4.
In practical application, as shown in fig. 3, in the field construction stage, firstly, the cushion layer 7 is constructed to make the bottom surface of the structure flat, and then the installation and placement of the external wall panels are performed according to the positioning on the cushion layer 7 (that is, the two external wall panels are arranged oppositely to make the anchoring steel bars 4 approach each other); then, the inner side wall plate 3 is fixed through a support plate 8 and is vertically corrected, the support plate 8 is fixed through a support steel bar 9, and the support steel bar 9 is embedded in the second cast-in-place section 6; and finally, pouring a second cast-in-place section 6 and a first cast-in-place section 5, wherein the second cast-in-place section 6 is formed in the pouring cavity 31 and does not extend outwards, the external wall panel is anchored in the second cast-in-place section 6 through the anchoring steel bars 4, and the truss steel bars 2 are embedded in the first cast-in-place section 5, so that the structure forms a reliable whole. And two adjacent this side fascia that set up of length along utility tunnel can form a whole because of the existence of first cast-in-place section 5 and the cast-in-place section 6 of second, have improved utility tunnel's wholeness, structural strength and shear behavior.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides a two-sided coincide side fascia of integral utility tunnel of environment-friendly prefabricated assembly which characterized in that includes:
the two wallboards are arranged in parallel, namely an outer wallboard forming the outer side wall of the comprehensive pipe gallery and an inner wallboard forming the inner side wall of the comprehensive pipe gallery;
a pouring cavity for pouring a first cast-in-place section is formed in a space between the outer side wall plate and the inner side wall plate, and truss steel bars are arranged in the pouring cavity;
the outer side wall board comprises a first steel reinforcement framework and a first concrete layer wrapping the first steel reinforcement framework;
the inner side wall board comprises a second steel reinforcement framework and a second concrete layer wrapping the second steel reinforcement framework;
one end of the truss steel bar is connected with the first steel bar framework; the other end of the truss steel bar is connected with the second steel bar framework;
and anchoring steel bars extending to the second cast-in-place section are respectively embedded at two ends of the wallboard along the height direction, and the extending direction of the anchoring steel bars is perpendicular to the wallboard.
2. The environment-friendly prefabricated and assembled integrated comprehensive pipe gallery double-sided laminated external wall panel according to claim 1, characterized in that:
and a plurality of truss reinforcing steel bars are arranged in a Z shape along the height direction.
3. The environment-friendly prefabricated and assembled integrated comprehensive pipe gallery double-sided laminated external wall panel according to claim 1, characterized in that:
the anchoring steel bars are arranged on the outer side wall board and/or the inner side wall board.
4. The environment-friendly prefabricated and assembled integrated comprehensive pipe gallery double-sided laminated external wall panel according to claim 3, characterized in that:
the size of the outer side wall board along the height direction is larger than that of the inner side wall board;
the anchoring reinforcing steel bar is formed by extending the first reinforcing steel bar framework after being bent, and the second reinforcing steel bar framework is connected with the anchoring reinforcing steel bar.
5. The environment-friendly prefabricated and assembled integrated comprehensive pipe gallery double-sided laminated external wall panel according to claim 3, characterized in that:
the size of the outer side wall board along the height direction is larger than that of the inner side wall board;
the anchoring steel bar is formed by bending and extending the first steel bar framework;
the anchoring steel bar is formed by extending the bent second steel bar framework.
6. The environment-friendly prefabricated and assembled integrated comprehensive pipe gallery double-sided laminated external wall panel according to claim 1, characterized in that:
the anchoring steel bars are arranged in an array.
7. The environment-friendly prefabricated assembled integral type comprehensive pipe gallery double-sided laminated external wall panel according to any one of claims 1 to 6, characterized in that:
the anchoring reinforcing bar is the crotch structure, including straightway and crotch section, the straightway is close to the wallboard setting, the terminal orientation of crotch section the wallboard.
8. The environment-friendly prefabricated assembled integral type comprehensive pipe gallery double-sided laminated external wall panel according to any one of claims 1 to 6, characterized in that:
the anchoring reinforcing bar is of a linear structure, and an anchoring plate is arranged at the tail end of one side, far away from the wallboard, of the anchoring reinforcing bar.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920071752.5U CN209873860U (en) | 2019-01-16 | 2019-01-16 | Two-sided coincide side fascia of integral utility tunnel of environment-friendly prefabricated assembly |
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| CN201920071752.5U CN209873860U (en) | 2019-01-16 | 2019-01-16 | Two-sided coincide side fascia of integral utility tunnel of environment-friendly prefabricated assembly |
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| CN209873860U true CN209873860U (en) | 2019-12-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115217149A (en) * | 2022-08-15 | 2022-10-21 | 上海市城市建设设计研究总院（集团）有限公司 | Prefabricated and cast-in-place combined open-cut tunnel box culvert structure and tunnel construction method |
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2019
- 2019-01-16 CN CN201920071752.5U patent/CN209873860U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115217149A (en) * | 2022-08-15 | 2022-10-21 | 上海市城市建设设计研究总院（集团）有限公司 | Prefabricated and cast-in-place combined open-cut tunnel box culvert structure and tunnel construction method |
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