CN113294175B - Construction method of tunnel secondary lining structure and tunnel secondary lining structure - Google Patents
Construction method of tunnel secondary lining structure and tunnel secondary lining structure Download PDFInfo
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- CN113294175B CN113294175B CN202110620016.2A CN202110620016A CN113294175B CN 113294175 B CN113294175 B CN 113294175B CN 202110620016 A CN202110620016 A CN 202110620016A CN 113294175 B CN113294175 B CN 113294175B
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- 238000010276 construction Methods 0.000 title claims abstract description 108
- 238000009434 installation Methods 0.000 claims abstract description 30
- 238000011065 in-situ storage Methods 0.000 claims description 54
- 239000004567 concrete Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 27
- 230000002787 reinforcement Effects 0.000 claims description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 23
- 239000002131 composite material Substances 0.000 claims description 23
- 239000010959 steel Substances 0.000 claims description 23
- 239000011376 self-consolidating concrete Substances 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 230000003014 reinforcing effect Effects 0.000 claims description 18
- 239000011150 reinforced concrete Substances 0.000 claims description 16
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 12
- 239000002689 soil Substances 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 7
- 239000011440 grout Substances 0.000 description 5
- 230000032258 transport Effects 0.000 description 4
- 238000005056 compaction Methods 0.000 description 3
- 238000009415 formwork Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction 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
- 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
- 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
- E21D11/102—Removable shuttering; Bearing or supporting devices therefor
-
- 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
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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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
- E21D11/40—Devices or apparatus specially adapted for handling or placing units of linings or supporting units for tunnels or galleries
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The application discloses a construction method of a tunnel secondary lining structure and the tunnel secondary lining structure, comprising the following steps: and preparing a prefabricated laminated slab for constructing a double-lining structure outside the tunnel. Splicing the prefabricated laminated slab on a two-lining trolley outside the tunnel; transporting the assembled prefabricated laminated slab to a construction installation position in a tunnel through a second lining trolley; and installing the prefabricated laminated slab at the construction installation position.
Description
Technical Field
The application relates to the field of tunnel support, in particular to a construction method of a tunnel secondary lining structure and the tunnel secondary lining structure.
Background
Currently, in the prior art, tunnel two-liner structures are mainly divided into two types. The first is a full cast-in-situ structure, namely, firstly, the outline of a tunnel is excavated, primary support is carried out, then, on the basis of the primary support in the tunnel, two lining steel bars are bound, then, a template is supported, and finally, concrete is poured.
The second type is a full prefabricated structure, a tunnel is firstly excavated, primary support is carried out, the production and processing of the two lining structural components are carried out in a prefabricated factory, the two lining structural components are transported to a construction site, then the two lining structural components are transported into the tunnel by adopting a trolley, and finally the prefabricated components are connected and reinforced.
However, when the two-lining structure is manufactured by utilizing the two-lining full cast-in-situ structure technology, the problems of difficult binding of the two-lining steel bars, difficult supporting of the formwork, unreasonable concrete pouring and the like often occur due to the narrow space in the tunnel and severe construction environment. When the two-lining structure is manufactured by the two-lining full-prefabricated structure technology, the mechanical property and the waterproof property of the connecting joint do not meet the design requirements. These problems seriously affect the construction quality and the construction progress of the tunnel secondary lining structure.
Aiming at the technical problems that in the prior art, the two lining templates are difficult to prop up, concrete pouring is not practical, and the mechanical property and the waterproof property of the prefabricated component connecting joint are poor, so that the construction quality and the progress of the two lining of the tunnel are seriously influenced, no effective solution is proposed at present.
Disclosure of Invention
The disclosure provides a construction method of a tunnel secondary lining structure and the tunnel secondary lining structure, which at least solve the technical problems that in the prior art, a secondary lining template is difficult to prop up, concrete pouring is not solid, and the mechanical property and the waterproof property of a prefabricated component connecting joint are poor, so that the construction quality and the progress of the tunnel secondary lining are seriously influenced.
According to one aspect of the present application, there is provided a construction method of a tunnel two-lining structure, including: preparing a prefabricated laminated slab for constructing a two-lining structure outside the tunnel; splicing the prefabricated laminated slab on a two-lining trolley outside the tunnel; transporting the assembled prefabricated laminated slab to a construction installation position in a tunnel through a second lining trolley; and installing the prefabricated laminated slab at the construction installation position.
Optionally, the operation of forming the prefabricated laminated slab for constructing the two-liner structure in the tunnel includes: and preparing the arch wall prefabricated laminated slab for constructing the double-lining structure. The arch wall prefabricated laminated slab comprises truss reinforced concrete plates and first earth facing surface reinforcing mesh sheets which are arranged in a laminated mode; and preparing a vault prefabricated laminated slab for constructing a secondary lining structure, wherein the vault prefabricated laminated slab comprises truss reinforced concrete plates and second earth facing surface reinforced meshes.
Optionally, the operation of splicing the prefabricated laminated slab on the secondary lining trolley comprises the following steps: grouting sleeve preformed holes are formed in two ends of a truss reinforced concrete slab of the vault precast laminated slab along the cross section direction; inserting a grouting sleeve for connecting the arch wall prefabricated laminated slab and the vault prefabricated laminated slab into a grouting sleeve preformed hole; and inserting reserved reinforcing steel bars of the arch wall prefabricated laminated slab into the grouting sleeve and connecting the grouting sleeve with the arch wall prefabricated laminated slab.
Optionally, the operation of assembling the prefabricated laminated slab on the secondary lining trolley further includes: binding a first earth facing surface reinforcing steel bar mesh of the arch wall prefabricated laminated slab with a second earth facing surface reinforcing steel bar mesh of the arch roof prefabricated laminated slab.
Optionally, assembling the prefabricated laminated slab on a secondary lining trolley, and further comprising; longitudinal bolting reinforcement cages used for connecting the prefabricated laminated plates are arranged along the longitudinal direction of the secondary lining structure; splicing a plurality of prefabricated arch wall superimposed plates with the length of one running water section together along a longitudinal bolting reinforcement cage; splicing a plurality of vault prefabricated superimposed sheets with the length of one running water section together along a longitudinal bolting reinforcement cage; and temporarily fixing the assembled prefabricated laminated slab on the two-lining trolley.
Optionally, the method further comprises: pouring a cast-in-situ inverted arch at the bottom of the tunnel; and after the cast-in-situ inverted arch is poured, paving the track of the two lining trolleys on the cast-in-situ inverted arch.
Optionally, the operation of casting the cast-in-place inverted arch at the bottom of the tunnel comprises: paving a cast-in-situ inverted arch reinforcing mesh for constructing a cast-in-situ inverted arch in the tunnel; and pouring concrete on the cast-in-situ inverted arch reinforcing mesh to form a cast-in-situ inverted arch.
Optionally, transporting the assembled prefabricated composite slab to a construction installation location in the tunnel by the secondary lining trolley further comprises: and driving the second lining trolley to transport the prefabricated laminated slab into the tunnel and adjusting the position of the prefabricated laminated slab.
Optionally, the operation of installing the prefabricated laminated slab at the construction installation location includes: reserving reserved reinforcing bars of the arch wall prefabricated laminated slab at the end parts of the arch wall prefabricated laminated slab; reserving reserved reinforcing steel bars for inverted arches at the end parts of the cast-in-situ inverted arches; and welding the reserved reinforcing steel bars of the prefabricated laminated slab of the arch wall and the reserved reinforcing steel bars of the cast-in-situ inverted arch.
Optionally, the operation of installing the prefabricated laminated slab at the construction installation location includes: erecting a template between the cast-in-situ inverted arch and the arch wall prefabricated laminated slab; and pouring self-compacting concrete on the prefabricated laminated slab.
According to another aspect of the present application, there is also provided a tunnel secondary liner structure, including: the laminated plate layer is formed by splicing a plurality of prefabricated laminated plates; and self-compacting concrete poured over the laminated slab.
Therefore, through the technical scheme of the embodiment, the technical problems in the prior art are solved, and the embodiment is suitable for construction related to a tunnel two-lining structure, and has the following advantages:
1. the prefabricated laminated slab is assembled outside the tunnel portal, so that the problems of difficult supporting of the two lining templates and unreasonable concrete pouring in the field of tunnel support are effectively solved;
2. the prefabricated laminated slab is produced in a factory, so that the quality of the prefabricated laminated slab is ensured, the pollution of a construction site is avoided, and the construction progress is improved;
3. the prefabricated laminated slab is adopted to construct a tunnel secondary lining structure, so that the traditional secondary lining construction template can be replaced;
4. in the embodiment, the joint of the earth facing surface of the prefabricated laminated slab, the cast-in-situ inverted arch and the prefabricated laminated slab is poured by self-compacting concrete, so that the problem of unreasonable concrete pouring in the traditional two-lining construction can be effectively solved.
The above, as well as additional objectives, advantages, and features of the present application will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present application when read in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the present application will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:
FIG. 1 is a schematic diagram of method steps of a tunnel liner construction structure according to one embodiment of the present application;
FIG. 2 is a front view of a disassembled structure of a tunnel secondary lining construction structure according to one embodiment of the present application;
FIG. 3 is a front view of the overall structure of a tunnel secondary lining construction structure according to one embodiment of the present application;
FIG. 4 is an elevation view of a secondary liner trolley, prefabricated composite slab, and cast-in-place inverted arch structure of a tunnel secondary liner construction structure according to one embodiment of the present application;
FIG. 5 is a three-dimensional schematic diagram of a tunnel secondary lining construction structure assembled in accordance with one embodiment of the disclosure;
FIG. 6 is a schematic cross-sectional view of a prefabricated composite slab of a vault of a tunnel secondary lining construction structure along the longitudinal direction of a tunnel according to one embodiment of the present application;
FIG. 7 is a schematic cross-sectional view of a prefabricated composite slab of a tunnel secondary lining construction structure in a construction section and at a construction joint along a tunnel longitudinal direction according to an embodiment of the present application;
FIG. 8 is a structural side view of a two-liner trolley of a tunnel two-liner construction structure according to one embodiment of the present application; and
fig. 9 is a schematic view of a portion of a cast-in-place inverted arch of a tunnel secondary lining construction structure according to one embodiment of the present application.
Detailed Description
It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order that those skilled in the art will better understand the present disclosure, a technical solution in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure, shall fall within the scope of the present disclosure.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the foregoing figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are, for example, capable of operation in connection with other embodiments. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The present embodiment provides a construction method of a tunnel two-lining structure, wherein fig. 1 shows a flowchart of the construction method according to the present embodiment, and referring to fig. 1, the method includes:
s102: preparing a prefabricated laminated slab 10 for constructing a two-lining structure outside the tunnel;
s104: splicing the prefabricated laminated slab 10 on a secondary lining trolley 30 outside the tunnel;
s106: transporting the assembled prefabricated laminated slab 10 to a construction installation position in a tunnel through a second lining trolley 30; and
s108: the prefabricated laminated slab 10 is installed at the construction installation position.
Specifically, according to a construction method of a tunnel double-lining structure of the present embodiment, first, a prefabricated laminated slab 10 for constructing the double-lining structure is prepared in advance outside a tunnel (S102). Wherein fig. 2 is a front view of a split structure of a tunnel double-lining construction structure according to an embodiment of the present application, in which the construction of a prefabricated composite panel 10 for constructing a double-lining structure is shown. The prefabricated laminated slab 10 of the two-lining structure can be prepared in a factory, for example, and has an advantage over the operation of preparing the prefabricated laminated slab 10 of the two-lining structure in a tunnel in that the prefabricated laminated slab 10 can be prepared in advance in the factory not only according to the designed specification but also the construction pollution of preparing the prefabricated laminated slab 10 in the tunnel can be reduced, and the construction progress can be improved.
Then, referring to fig. 4 or 8, the method of the present embodiment assembles the prefabricated laminated slab 10 on the two-lining trolley 30 outside the tunnel. In the prior art, most of the construction of the tunnel double lining structure is directly carried out inside the tunnel. However, due to the narrow space inside the tunnel and the severe construction environment, the method for performing the construction of the secondary lining structure in the tunnel has the problems of difficult binding of the secondary lining reinforcing steel bars and unreasonable concrete pouring, and the problems may affect the progress and quality of the construction of the secondary lining of the tunnel. The method of the embodiment can facilitate the binding of the secondary lining steel bars by splicing the secondary lining trolley 30 outside the tunnel, thereby accelerating the progress of secondary lining construction and enhancing the quality of secondary lining construction.
The method of the present embodiment then transports the assembled prefabricated composite panel 10 to a construction installation location within the tunnel by the secondary liner trolley 30. The second lining trolley 30 drives the installed prefabricated laminated slab 10 to enter the tunnel, and the installed prefabricated laminated slab 10 is placed at the construction installation position. This makes it possible to fully utilize the function of the two-lining trolley 30 and to accurately mount the mounted prefabricated laminated slab 10 to the construction installation position. The construction progress is quickened and the construction quality is improved.
Finally, the method of the present embodiment installs the prefabricated laminated sheet 10 at the construction installation location. When the prefabricated laminated slab 10, which has been installed, is placed at the construction installation position and installed, the installation of the two-lining structure is completed.
As described in the background art, in the prior art, the tunnel liner structure is mainly divided into two types. The first is a full cast-in-situ structure, namely, firstly, the outline of a tunnel is excavated, primary support is carried out, then, on the basis of the primary support in the tunnel, two lining steel bars are bound, then, a template is supported, and finally, concrete is poured. The second type is a full prefabricated structure, a tunnel is firstly excavated, primary support is carried out, the production and processing of the two lining structural components are carried out in a prefabricated factory, the two lining structural components are transported to a construction site, then the two lining structural components are transported into the tunnel by adopting a trolley, and finally the prefabricated components are connected and reinforced.
However, when the two-lining structure is manufactured by utilizing the two-lining full cast-in-situ structure technology, the problems of difficult binding of the two-lining steel bars, difficult supporting of the formwork, unreasonable concrete pouring and the like often occur due to the narrow space in the tunnel and severe construction environment. When the two-lining structure is manufactured by the two-lining full-prefabricated structure technology, the mechanical property and the waterproof property of the connecting joint do not meet the design requirements. These problems seriously affect the construction quality and the construction progress of the tunnel secondary lining structure.
In view of this technical problem, the method described in this embodiment performs preparation of the prefabricated laminated slab 10 in advance outside the tunnel in the construction of the tunnel double-lined structure, and transports the prepared prefabricated laminated slab 10 to the inside of the tunnel by using the double-lined trolley 30 for installation and construction. Thus, in the above manner, the construction method of the tunnel double-lining structure according to the present embodiment can realize the assembly of the prefabricated composite slab 10 outside the tunnel and the transportation thereof to the specified installation position inside the tunnel by the double-lining trolley 30. The technical problems that in the prior art, the secondary lining template is difficult to prop up and concrete pouring is not practical, and the mechanical property and the waterproof property of the prefabricated part connecting joint are poor, so that the construction quality and the progress of the secondary lining of the tunnel are seriously affected are solved.
Optionally, the operation of forming the prefabricated laminated slab 10 for constructing the double-lined structure in the tunnel includes: preparing an arch wall prefabricated laminated slab 101 for constructing a secondary lining structure, wherein the arch wall prefabricated laminated slab 101 comprises truss reinforced concrete plates 1011 and first earth facing reinforced meshes 1012 which are arranged in a laminated manner; and preparing a vault prefabricated laminated slab 102 for constructing a two-lining structure, wherein the vault prefabricated laminated slab 102 comprises truss reinforced concrete slabs 1021 and second earth facing surface reinforcement meshes 1022.
Specifically, fig. 2 shows a front view of a disassembled structure of a tunnel secondary lining construction structure according to an embodiment of the present application, and fig. 5 further shows an assembled three-dimensional schematic view of the tunnel secondary lining construction structure according to an embodiment of the present application. Referring to fig. 2 and 5, when forming a prefabricated laminated slab 10 for constructing a double-lined structure outside a tunnel, an arch wall prefabricated laminated slab 101 and an arch roof prefabricated laminated slab 102 for constructing a double-lined structure may be prepared. Wherein, the prefabricated superimposed sheet 101 of arch wall includes truss reinforced concrete slab 1011 and first earth facing surface reinforcing mesh 1012. Truss reinforced concrete slab 1011 and first earth facing surface reinforcement mesh 1012 are stacked. Truss reinforced concrete slab 1011 may be used as a frame of arch wall precast composite sheet 101 and support arch wall precast composite sheet 101. The first earth facing rebar mesh 1012 can be used to connect with truss rebar concrete slab 1011 and form arch wall precast composite slab 101. Wherein the vault precast laminated slab 102 includes truss reinforced concrete slab 1021 and a second earth facing surface reinforcement mesh 1022. The truss reinforced concrete slab 1021 and the second earth facing surface reinforcement mesh 1022 are stacked. Truss reinforced concrete slab 1021 may be used as a frame of the dome prefabricated laminated slab 102 and support the dome prefabricated laminated slab 102. Thereby, the arch wall prefabricated laminated sheet 101 and the arch crown prefabricated laminated sheet 102 can be installed. Further, the partial installation of the prefabricated laminated sheet 10 can be completed.
Alternatively, the operation of splicing the prefabricated laminated sheet 10 on the two-lining trolley 30 includes: grouting sleeve preformed holes 103A are formed in two ends of truss reinforced concrete slab 1021 of arch crown precast laminated slab 102 along the cross section direction; inserting a grouting sleeve 103B for connecting the arch wall prefabricated laminated slab 101 and the arch crown prefabricated laminated slab 102 into the grouting sleeve preformed hole 103A; and inserting reserved steel bars 1011 of the arch wall prefabricated laminated slab 101 into the grouting sleeve 103B and connecting with the arch wall prefabricated laminated slab 102.
Specifically, referring to fig. 2 and 4, first, the prefabricated composite slab 10 is installed and fixed on the steel frame of the secondary backing trolley 30, and in the process of assembling the prefabricated composite slab 10 on the secondary backing trolley 30, grouting sleeve pre-holes 103A may be first provided at both ends of the truss reinforced concrete slab 1021 of the dome prefabricated composite slab 102. The purpose of the grout sleeve preformed hole 103A is to install the grout sleeve 103B. One end of the grout sleeve 103B is inserted into the grout sleeve preformed hole 103A. Wherein fig. 4 is a schematic cross-sectional structure view of a dome prefabricated laminated slab of a tunnel secondary lining construction structure in a longitudinal direction of a tunnel according to an embodiment of the present application, and a schematic view of a grouting sleeve 103B distributed in the longitudinal direction is shown in fig. 4. And, the end of the arch wall prefabricated laminated slab 101 is provided with the reserved reinforcement 1013 so that the reserved reinforcement 1013 can be inserted into the other end of the grouting sleeve 103B. Thus, the grout sleeve 103B can be used to connect the dome prefabricated laminated slab 102 and the arch wall prefabricated laminated slab 101. So that the dome prefabricated laminated sheet 102 and the arch wall prefabricated laminated sheet 101 arranged in the cross-sectional direction can be connected together. Therefore, the arch wall prefabricated laminated slab 101 and the arch roof prefabricated laminated slab 102 can be integrally connected, and construction progress is quickened.
Further, as shown with reference to fig. 2 and 9, shear grooves 203 and buried water stops 204 are also provided on both end surfaces of the cast-in-place inverted arch 20. Shear is the resistance to shear failure, and when the tunnel is subjected to a horizontal external force, the shear groove 203 can resist the shear failure generated by the external force acting on the secondary lining structure. Wherein the shear groove 203 can be provided with a reserved reinforcement 1013 and a buried water stop 204. The buried water stop 204 can be used to prevent water seepage, enhance the waterproof performance of the two-lining structure and effectively block the lateral migration of water at the construction joint of the self-compacting concrete 105. So as to avoid the self-compacting concrete 105 from being poured, the self-compacting concrete 105 has cracks due to water seepage.
Optionally, the operation of splicing the prefabricated laminated slab 10 on the secondary lining trolley 30 further includes: binding a first soil facing reinforcing mesh 1012 of the arch wall prefabricated laminated slab 101 with a second soil facing reinforcing mesh 1022 of the arch wall prefabricated laminated slab 102.
Specifically, referring to fig. 2, the method is provided with a first soil facing reinforcing mesh 1012 on the outer side of the arch wall prefabricated laminated slab 101, and a second soil facing reinforcing mesh 1022 on the outer side of the arch wall prefabricated laminated slab 102. Binding a first soil facing reinforcing bar mesh 1012 on the outer side of the arch wall prefabricated laminated slab 101 with a second soil facing reinforcing bar mesh 1022 on the outer side of the arch wall prefabricated laminated slab 102. This can make the connection of the arch wall pre-fabricated laminated slab 101 and the arch crown pre-fabricated laminated slab 102 more firm and can bear a part of the pressure.
Optionally, the operation of splicing the prefabricated laminated slab 10 on the secondary lining trolley 30 further includes; longitudinal bolting reinforcement cages 104 for connecting the prefabricated composite plates 10 are arranged along the longitudinal direction of the secondary lining structure; splicing a plurality of prefabricated arch wall superimposed plates 101 with the length of one running water section together along a longitudinal bolting reinforcement cage 104; splicing a plurality of vault prefabricated superimposed plates 101 with the length of one running water section together along a longitudinal bolting reinforcement cage 104; and temporarily fixing the assembled prefabricated laminated slab 10 to the second lining trolley 30.
Specifically, fig. 7 shows a schematic cross-sectional structure of a prefabricated laminated slab of a tunnel secondary lining construction structure according to an embodiment of the present application in a construction section and at a construction joint along a tunnel longitudinal direction, and fig. 6 is a schematic cross-sectional structure of a dome prefabricated laminated slab of a tunnel secondary lining construction structure according to an embodiment of the present application along a tunnel longitudinal direction. Referring to fig. 6 and 7, the method inserts a plurality of identical prefabricated arch wall composite panels 101 longitudinally into a longitudinal bolting reinforcement cage 104. The prefabricated arch wall composite plates 101 of the whole running water section are connected by using a longitudinal bolting reinforcement cage 104. Moreover, the method inserts a plurality of identical vault prefabricated superimposed slabs 102 into a longitudinal bolting reinforcement cage 104 along the longitudinal direction, and connects the vault prefabricated superimposed slabs 102 of the whole running water section by using the longitudinal bolting reinforcement cage 104. Thus, the arch wall prefabricated laminated slab 101 of an entire running water section, the arch roof prefabricated laminated slab 102 of an entire running water section, and the arch wall prefabricated laminated slab 101 and the arch roof prefabricated laminated slab 102 which have been connected in the cross-sectional direction of the present method will form a whole. Thus, the prefabricated laminated sheet 10 can be made more complete, and the longitudinally connected prefabricated laminated sheet 10 can be supported so as to become stronger.
Preferably, the longitudinal bolting cages 104 comprise a continuous casting cage 1041 and a construction joint cage 1042. Wherein a continuous casting reinforcement cage 1041 is used to connect the arch wall prefabricated composite slab 101 and the vault prefabricated composite slab 102. Construction joint steel bar cage 1042 is convenient for connecting the two lining structure pouring of adjacent running water section. And, the embedded water stop 204 is placed in the construction joint reinforcement cage 1042, and the embedded water stop 204 can strengthen the waterproof performance of the construction joint.
Optionally, the method further comprises: pouring a cast-in-situ inverted arch 20 at the bottom of the tunnel; and after the cast-in-situ inverted arch 20 is cast, paving the track of the secondary lining trolley 30 on the cast-in-situ inverted arch 20.
Specifically, referring to fig. 2, 3 and 4, the present method casts a cast-in-place inverted arch 20 at the bottom of the tunnel. Cast-in-place inverted arch 20 is cast-in-place and is to be made in advance, so that a form is also required to cast concrete. The cast-in-place inverted arch 20 can be laid with the rails of the secondary liner trolley 30. And the two ends of the cast-in-situ inverted arch can strengthen the soil surface at the two ends of the tunnel and prevent the soil surface from dumping. The cast-in-situ inverted arch 20 is paved, and the tracks of the two lining trolleys 30 are paved on the cast-in-situ inverted arch 20, so that the two lining trolleys 30 can smoothly convey the assembled prefabricated laminated slab 10 to a construction installation place.
Optionally, the operation of casting the cast-in-place inverted arch 20 at the bottom of the tunnel includes: paving a cast-in-situ inverted arch reinforcing mesh 201 for constructing a cast-in-situ inverted arch 20 in the tunnel; and casting concrete on the cast-in-place inverted arch reinforcing mesh 201 to form the cast-in-place inverted arch 20.
Specifically, referring to fig. 2 and 4, the method firstly sets a cast-in-place inverted arch reinforcing mesh 201 in the tunnel, and the cast-in-place inverted arch reinforcing mesh 201 has a shape similar to that of the cast-in-place inverted arch 20 formed by casting and can be used as a frame of the cast-in-place inverted arch 20. And pouring concrete on the cast-in-situ inverted arch reinforcing mesh 201, and forming the cast-in-situ inverted arch 20 after the concrete pouring is completed and the concrete is accepted. Thus, it is possible to provide a foundation for the track construction of the secondary trolley 30 and to carry the pressure of the earth dumping in the tunnel.
Optionally, the operation of transporting the assembled prefabricated composite sheet 10 to the construction installation position in the tunnel by the second lining trolley 30 further includes: the second liner trolley 30 is driven to transport the prefabricated laminated slab 10 to the inside of the tunnel and adjust the position of the prefabricated laminated slab 10.
Specifically, referring to fig. 4, the operation of transporting the assembled prefabricated composite panel 10 to a construction installation position in a tunnel by the secondary lining trolley 30 includes: the second lining trolley 30 is set on the track of the second lining trolley 30 after pouring is completed, the second lining trolley 30 is driven, the prefabricated laminated slab 10 is transported into the tunnel by the second lining trolley 30, and the position of the prefabricated laminated slab 10 on the second lining trolley 30 is adjusted. Thus, the prefabricated laminated slab 10 can be accurately adjusted to the construction installation position, and the prefabricated laminated slab 10 can be accurately installed.
Alternatively, the operation of installing the prefabricated laminated slab 10 at the construction installation position includes: the end part of the arch wall prefabricated laminated slab 101 is reserved with arch wall prefabricated laminated slab reserved steel bars 1013; reserving the cast-in-place inverted arch reserved steel bars 202 at the end of the cast-in-place inverted arch 20; and welding the arch wall prefabricated laminated slab reserved steel bars 1013 and the cast-in-situ inverted arch reserved steel bars 202.
Specifically, referring to fig. 2, the method reserves arch wall prefabricated laminated slab reserved reinforcement 1013 at the other end of the arch wall prefabricated laminated slab 101, and reserves inverted arch reserved reinforcement 202 at both ends of the cast-in-place inverted arch 20. The arch wall prefabricated laminated slab reserved steel bars 1013 and the cast-in-situ inverted arch reserved steel bars 202 are welded so that the installed prefabricated laminated slab 10 is connected with the cast-in-situ inverted arch 20. Thus, the cast-in-place inverted arch 20 can be made to support the assembled prefabricated laminated slab 10 so that the cast-in-place inverted arch 20 and the prefabricated laminated slab 10 form a whole, supporting the inner surface of the tunnel.
Alternatively, the operation of installing the prefabricated laminated slab 10 at the construction installation position includes: erecting a template between the cast-in-situ inverted arch 20 and the arch wall prefabricated laminated slab 101; and self-compacting concrete 105 is poured on the prefabricated laminated slab 101.
Specifically, referring to fig. 2, 3 and 9, the operation of installing the prefabricated laminated sheet 10 at the construction installation position includes: and erecting a template between the cast-in-situ inverted arch 20 and the arch wall prefabricated laminated slab 101. One end gap is reserved between the cast-in-situ inverted arch 20 and the arch wall prefabricated laminated slab 101, so that a template is required to be installed between the cast-in-situ inverted arch 20 and the arch wall prefabricated laminated slab 101, and the template is supported, so that the stability of a two-lining structure during construction in a tunnel is ensured. And pour the self-compaction concrete 105 on prefabricated superimposed sheet 10, pour the self-compaction concrete 105 on prefabricated superimposed sheet 10 can make two lining structure more firm, can effectively solve the concrete placement problem of traditional two lining constructions. Therefore, the two-lining structure can be safer and more reliable.
Preferably, the tool for setting up the template between the cast-in-situ inverted arch 20 and the arch wall prefabricated laminated slab 101 can select a scaffold or can select a secondary lining trolley 30 for setting up.
According to another aspect of the present application, there is also provided a tunnel secondary lining structure constructed by the method described above, comprising: a laminated sheet layer formed by splicing a plurality of prefabricated laminated sheets 10; and self-compacting concrete 105 poured over the laminated slab.
Specifically, referring to fig. 3, a tunnel secondary lining structure includes prefabricated composite slab 10 and self-compacting concrete 105. The prefabricated laminated slab 10 is installed at a construction position in a tunnel, and the prefabricated laminated slab 10 is mainly used for constructing a two-lining structure and keeps the safety and stability of construction in the tunnel. The self-compacting concrete 105 is poured on the upper portion of the prefabricated laminated slab 10, and the self-compacting concrete 105 is utilized for pouring, so that the integrity, the mechanical property and the waterproof property of the two-lining structure are better.
Preferably, the self-compacting concrete 105 may be pumped in situ, and the self-compacting concrete 105 may be prepared in situ by pumping to prevent the self-compacting concrete 105 from setting and to facilitate transportation.
Thus, the two-lining structure made of the prefabricated laminated slab 10 and the self-compacting concrete 105 effectively solves the technical problems of difficult formwork support and unrealistic concrete pouring. Furthermore, the technical effects of improving the integrity, mechanical property and waterproof property of the two-lining structure are achieved.
In addition, the complete flow steps of the construction method of the tunnel two-lining structure provided by the embodiment are as follows:
step one: transporting the second lining trolley 30 and all the components of the assembled tunnel second lining to a tunnel portal, and splicing the prefabricated laminated slab 10 on the second lining trolley 30 by adopting a crane, wherein the splicing length is the length of a production line;
step two: the vault prefabricated laminated slab 102 and the vault prefabricated laminated slab 101 are connected through a grouting sleeve 103B and arch wall prefabricated laminated slab reserved steel bars 1013, a second earth facing steel bar net 1022 is bound, the vault prefabricated laminated slab 101 and the vault prefabricated laminated slab 102 along the longitudinal direction of the tunnel are connected by adopting a longitudinal bolting steel bar cage 104 along the longitudinal direction of the tunnel, and the assembled integrated prefabricated laminated slab 10 is temporarily fixed on the secondary lining trolley 30;
step three: binding a cast-in-situ inverted arch reinforcing steel bar net 201 on site, pouring concrete, and paving a secondary lining trolley 30 track on the upper part of the cast-in-situ inverted arch 20 after the cast-in-situ inverted arch 20 concrete reaches the design strength;
step four: the assembled prefabricated laminated slab 10 is transported into a tunnel by utilizing a secondary lining trolley 30, the position of the prefabricated laminated slab 10 is adjusted, arch wall prefabricated laminated slab reserved steel bars 1013 and cast-in-situ inverted arch reserved steel bars 202 are welded and connected, and a construction joint steel bar cage 1042 is inserted along the circumferential direction of the prefabricated laminated slab 10 at the end part of the secondary lining trolley 30;
step five: erecting a template between the cast-in-situ inverted arch 20 and the arch wall prefabricated laminated slab 10, and pouring self-compacting concrete 105 on the earth facing surface of the prefabricated laminated slab 10 after the template is accepted;
step six: after the self-compacting concrete 105 of the cast-in-situ inverted arch 20 reaches the design strength, removing the template and withdrawing the secondary lining trolley 30 to the tunnel portal;
step seven: repeating the steps one to six until the two-lining construction of the whole tunnel is completed.
In the technology, the two-lining structural member belongs to a prefabricated laminated slab 10, and the prefabricated laminated slab 10 is produced, processed and transported to a construction site in a prefabricated factory. And splicing and binding upper reinforcing steel bars of the prefabricated laminated slab 10 on a secondary lining trolley 30 outside the tunnel. Then the prefabricated laminated slab 10 is connected and reinforced by adopting a secondary lining trolley 30 to be transported into the tunnel, and finally self-compacting concrete 105 at the upper part of the prefabricated laminated slab 10 is poured. Compared with a full cast-in-situ structure, the technology avoids binding reinforcing steel bars in the tunnel; compared with the full prefabricated structure, the prefabricated laminated slab 10 structure is formed by casting 105 with cast-in-situ self-compaction concrete, and has better integrity, mechanical property and waterproof property. Therefore, one of the differences of the tunnel secondary lining structure described in the present technology with respect to the prior art is that the tunnel secondary lining structure adopts a prefabricated laminated board structure.
Therefore, through the technical scheme of the embodiment, the technical problems in the prior art are solved, and the embodiment is suitable for construction related to a tunnel two-lining structure, and has the following advantages:
1. the prefabricated laminated slab is assembled outside the tunnel portal, so that the problems of difficult supporting of the two lining templates and unreasonable concrete pouring in the field of tunnel support are effectively solved;
2. the prefabricated laminated slab is produced in a factory, so that the quality of the prefabricated laminated slab is ensured, the pollution of a construction site is avoided, and the construction progress is improved;
3. the prefabricated laminated slab is adopted to construct a tunnel secondary lining structure, so that the traditional secondary lining construction template can be replaced;
4. in the embodiment, the joint of the earth facing surface of the prefabricated laminated slab, the cast-in-situ inverted arch and the prefabricated laminated slab is poured by self-compacting concrete, so that the problem of unreasonable concrete pouring in the traditional two-lining construction can be effectively solved.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In the description of the present disclosure, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present disclosure and to simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be configured and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present disclosure; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (7)
1. The construction method of the tunnel two-lining structure is characterized by comprising the following steps of:
preparing a prefabricated laminated slab (10) for constructing a double-lining structure outside the tunnel;
splicing the prefabricated laminated slab (10) on a two-lining trolley (30) outside the tunnel;
transporting the assembled prefabricated laminated slab (10) to a construction installation position in a tunnel through the two lining trolleys (30); and
-installing the prefabricated superimposed sheet (10) at the construction installation location;
the operation of forming a prefabricated laminated slab (10) for building said two-lining structure outside a tunnel comprises:
preparing an arch wall prefabricated laminated slab (101) for constructing the two-lining structure, wherein the arch wall prefabricated laminated slab (101) comprises truss reinforced concrete plates (1011) and first earth facing reinforced meshes (1012) which are arranged in a laminated mode; and
preparing a vault prefabricated laminated slab (102) for constructing the two-lining structure, wherein the vault prefabricated laminated slab (102) comprises truss reinforced concrete plates (1021) and second earth facing surface reinforcement meshes (1022);
the operation of splicing the prefabricated laminated slab (10) on the two-lining trolley (30) comprises the following steps:
grouting sleeve preformed holes (103A) are formed in two ends of truss reinforced concrete plates (1021) of the vault precast laminated slab (102) along the cross section direction;
inserting a grouting sleeve (103B) for connecting the arch wall prefabricated laminated slab (101) and the arch crown prefabricated laminated slab (102) into the grouting sleeve preformed hole (103A); and
inserting the arch wall prefabricated laminated slab reserved steel bars (1013) into the grouting sleeve (103B) and connecting with the arch wall prefabricated laminated slab (102);
-assembling the prefabricated superimposed sheet (10) on the two-lining trolley (30), further comprising:
binding a first soil facing surface reinforcing steel bar mesh (1012) of the arch wall prefabricated laminated slab (101) with a second soil facing surface reinforcing steel bar mesh (1022) of the arch wall prefabricated laminated slab (102).
2. The construction method of a tunnel double-lining structure according to claim 1, characterized by an operation of splicing the prefabricated composite slab (10) on the double-lining trolley (30), further comprising;
longitudinal bolting reinforcement cages (104) for connecting the prefabricated laminated plates (10) are arranged along the longitudinal direction of the secondary lining structure;
splicing a plurality of prefabricated arch wall superimposed plates (101) in the length of one running water section and/or between adjacent running water sections together along the longitudinal bolting reinforcement cage (104);
splicing a plurality of vault prefabricated superimposed plates (102) in the length of one running water section and/or between adjacent running water sections together along the longitudinal bolting reinforcement cage (104); and
and temporarily fixing the assembled prefabricated laminated slab (10) on the two-lining trolley (30).
3. The method of constructing a tunnel liner structure according to claim 2, further comprising:
pouring a cast-in-situ inverted arch (20) at the bottom of the tunnel; and
and after the cast-in-situ inverted arch (20) is poured, paving the track of the two lining trolleys (30) on the cast-in-situ inverted arch (20).
4. A method of constructing a tunnel secondary liner structure according to claim 3, wherein the operation of casting a cast-in-place inverted arch (20) in the tunnel bottom comprises:
paving a cast-in-situ inverted arch reinforcing mesh (201) for constructing the cast-in-situ inverted arch (20) in the tunnel; and
and pouring concrete on the cast-in-situ inverted arch reinforcing mesh (201) to form the cast-in-situ inverted arch (20).
5. The construction method of a tunnel double-lined structure according to claim 4, wherein the operation of transporting the assembled prefabricated composite sheet (10) to a construction installation position within the tunnel by the double-lined trolley (30) further comprises:
and driving the two lining trolleys (30) to transport the prefabricated laminated slab (10) into the tunnel and adjusting the position of the prefabricated laminated slab (10).
6. The construction method of the tunnel double-lining structure according to claim 4, wherein the operation of installing the prefabricated laminated slab (10) at the construction installation position includes:
reserving arch wall prefabricated laminated slab reserved steel bars (1013) at the end parts of the arch wall prefabricated laminated slabs (101);
reserving cast-in-situ inverted arch reserved steel bars (202) at the end parts of the cast-in-situ inverted arches (20); and
welding the arch wall prefabricated laminated slab preformed reinforcement (1013) and the cast-in-place inverted arch preformed reinforcement (202), and wherein
The operation of installing the prefabricated laminated slab (10) at the construction installation position includes:
erecting a template between the cast-in-situ inverted arch (20) and the arch wall prefabricated superimposed sheet (101); and is also provided with
And pouring self-compacting concrete (105) on the prefabricated laminated slab (10).
7. A tunnel liner structure comprising: a laminated board layer formed by splicing a plurality of prefabricated laminated boards (10); and self-compacting concrete (105) poured over the laminated slab.
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