CN111485904A - Construction method for large-section multi-arch tunnel mid-partition wall - Google Patents
Construction method for large-section multi-arch tunnel mid-partition wall Download PDFInfo
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- CN111485904A CN111485904A CN202010331705.7A CN202010331705A CN111485904A CN 111485904 A CN111485904 A CN 111485904A CN 202010331705 A CN202010331705 A CN 202010331705A CN 111485904 A CN111485904 A CN 111485904A
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- intermediate wall
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
Abstract
The invention relates to the technical field of tunnel construction, in particular to a method for constructing a large-section multi-arch tunnel mid-partition wall, which comprises the following steps: measuring and paying off; pouring a bottom plate of the intermediate wall; constructing an anchor rod at the top of the intermediate wall; constructing a steel perforated pipe at the bottom stratum of the intermediate wall; constructing middle partition wall steel bars; installing a template; pouring concrete; removing the mold and maintaining; and (5) grouting the wall top. By adopting the construction method of the large-section multi-arch tunnel intermediate wall, the intermediate wall can be firmly connected with the surrounding rocks at the top and the bottom of the wall, the intermediate wall and the surrounding rocks are integrated into a whole by grouting, the concrete pouring mode is improved, the dense and solid concrete at the top of the intermediate wall is ensured, no void is generated, and the construction quality of the intermediate wall is ensured.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a construction method of a large-section multi-arch tunnel mid-partition wall.
Background
In recent years, multi-arch tunnels have been widely used in tunnels (especially short tunnels) constructed on mountain roads because of the advantages of optimizing road line types, saving land, reducing construction cost and the like. The partition wall of the multi-arch tunnel can be regarded as an artificial support of double multi-arch, the stress change is large in the construction process, the effect of bearing unidirectional unbalanced force exists, instability and damage are easy to occur, and the guarantee of the stability of the middle wall is a key foundation for building the multi-arch tunnel. The peripheral load of the multi-arch tunnel is transmitted to the middle wall through the arch part structure, so that the middle wall is stressed in a concentrated manner. Enough measures must be provided in the construction to ensure that the middle wall does not deviate, incline and settle unevenly. However, in the prior art, the intermediate wall is not tightly connected with the rock mass, the vault can be separated after the vault is poured, and the quality of the intermediate wall is difficult to control, so that how to ensure the construction quality of the intermediate wall becomes a difficult point in the construction of the large-section multi-arch tunnel.
Disclosure of Invention
Aiming at the existing problems, the invention discloses a construction method of a large-section multi-arch tunnel mid-board, which comprises the following steps:
and step S1, using the total station to discharge the sideline of the bottom plate of the intermediate wall, and drawing lines to form a bottom plate sideline mark.
Step S2, pouring the middle partition wall bottom plate concrete according to the bottom plate side line mark;
step S3, vertically installing a plurality of hollow grouting anchor rods on the primary support of each ring of pilot tunnels positioned at the top of the intermediate wall, and grouting surrounding rock at the top of the intermediate wall by using the hollow grouting anchor rods;
step S4, installing a plurality of steel perforated pipes on the bottom stratum of the intermediate wall, and grouting the bottom stratum of the intermediate wall through the steel perforated pipes;
step S5, discharging sidelines of the steel bars of the intermediate wall by using a total station, and drawing lines to form steel bar sideline marks;
step S6, after the middle partition wall steel bars are installed according to the steel bar side line marks, embedding a grouting pipe in the upper portion of the middle partition wall, wherein the grouting pipe is arranged in an inclined mode, and the top of the grouting pipe is fixed on the primary support of the middle pilot tunnel;
step S7, using a total station to discharge sidelines of the intermediate wall, and drawing lines to form an intermediate wall sideline mark;
step S8, installing a template of the intermediate wall according to the intermediate wall sideline mark;
step S9 of performing a concrete casting process to form the intermediate wall;
and step S10, removing the template of the intermediate wall, and grouting the intermediate wall through the grouting pipe.
In the construction method of the mid-wall of the large-section multi-arch tunnel, the bottom plate sideline mark, the steel bar sideline mark and the mid-wall sideline mark are all red paints.
In the above construction method for the intermediate wall of the large-section multi-arch tunnel, in step S2, before the concrete for the intermediate wall bottom plate is poured, a step of cleaning floating slag and accumulated water at the bottom of the intermediate wall is further included.
In the above construction method for the intermediate wall of the large-section multi-arch tunnel, in step S3, the distance between the hollow grouting anchor rods located on the primary supports of the adjacent rings of the intermediate pilot tunnels is 0.4 to 0.6 m; and the distance between adjacent hollow grouting anchor rods positioned on the primary support of the middle pilot tunnel in the same ring is 0.5-0.6 m.
And (3) grouting the surrounding rock at the top of the partition wall by using the hollow grouting anchor rod by using cement paste added with 5% of water glass, wherein the water-cement ratio of the cement paste is 1: 1.
In the construction method of the partition wall in the large-section multi-arch tunnel, the distance between the adjacent steel perforated pipes in the longitudinal direction is 0.4-0.6 m; in the transverse direction, the distance between every two adjacent steel perforated pipes is 0.7-0.8 m;
and (3) grouting the stratum at the bottom of the partition wall by using the steel perforated pipe and cement paste added with 5% of water glass, wherein the water-cement ratio of the cement paste is 1: 1.
The construction method of the large-section multi-arch tunnel intermediate wall comprises the steps that the distance between every two adjacent grouting pipes is 4-6 m, and at least 2 grouting pipes are arranged on each intermediate wall.
In the above method for constructing the intermediate wall of the large-cross-section multi-arch tunnel, in step S6, the step of embedding the grout pipe in the upper portion of the intermediate wall includes:
binding the top of the grouting pipe on an expansion screw by using an iron wire, wherein the expansion screw is arranged on the primary support of the middle pilot tunnel;
and binding the middle part of the grouting pipe on the steel bars of the intermediate wall.
In the above method for constructing the intermediate wall of the large-cross-section multi-arch tunnel, in step S6, before the grouting pipe is embedded in the upper portion of the intermediate wall, a step of wrapping a non-woven geotextile on the top of the grouting pipe is further included.
The construction method of the intermediate wall of the large-section multi-arch tunnel includes, in step S9:
performing a first concrete pouring process, and pouring concrete to a position 1.7-1.9 m above the bottom plate of the intermediate wall;
and performing a second concrete pouring process, pouring concrete to the top of the intermediate wall, standing for 12-18 minutes after the concrete flows out of the grouting pipe from the top of the intermediate wall for the first time, and performing pressurized pouring for 3-5 minutes again.
In the above construction method for the intermediate wall of the large-section multi-arch tunnel, in step S10, the intermediate wall is grouted by the grouting pipes with cement paste of 1:1 water cement ratio;
wherein the initial pressure of the grouting is 0.5-1 MPa, and the final pressure is 1.8-2.2 MPa.
The invention has the following advantages or beneficial effects:
the invention discloses a construction method of a large-section multi-arch tunnel intermediate wall, which can ensure that the intermediate wall is firmly connected with surrounding rocks at the top and the bottom of a wall, is integrated with the surrounding rocks by grouting, improves the concrete pouring mode, ensures that the top of the intermediate wall is dense and solid in concrete, does not fall off, and ensures the construction quality of the intermediate wall.
Drawings
The invention and its features, aspects and advantages will become more apparent from reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
FIG. 1 is a flow chart of a construction method of a partition wall in a large-section multi-arch tunnel according to an embodiment of the invention;
fig. 2 is a front view of the construction of an intermediate wall in the embodiment of the present invention.
FIG. 3 is a perspective view illustrating the construction of an intermediate wall according to an embodiment of the present invention
In the figure, 1 is the preliminary support of the middle pilot tunnel; 2 is an intermediate wall bottom plate; 3 is a hollow grouting anchor rod; 4 is a steel perforated pipe; 5 is an intermediate wall; 6 is a grouting pipe; and 7 is a concrete delivery pipe.
Detailed Description
The present invention will be further described with reference to the following drawings and specific examples, but the present invention is not limited thereto.
As shown in fig. 1 to 3, the invention discloses a construction method of a large-section multi-arch tunnel mid-partition wall, which specifically comprises the following steps:
step S1, measuring the pay-off: and (4) utilizing the total station to discharge the sidelines of the bottom plate of the intermediate wall, and drawing lines to form bottom plate sideline marks.
In a specific embodiment of the present invention, the step S1 is specifically: the method comprises the steps of firstly setting a station by using a total station, discharging the sidelines of the bottom plate 2 of the intermediate wall by using the total station, and drawing lines by using red paint to form bottom plate sideline marks.
Step S2, pouring the bottom plate of the intermediate wall: pouring the middle partition wall bottom plate concrete according to the bottom plate side line marks.
In a specific embodiment of the present invention, the step S2 is specifically: scum and accumulated water at the bottom of the intermediate wall 5 are cleaned firstly, and then a layer of 20cm C30 intermediate wall bottom plate concrete is poured.
Step S3, constructing an anchor rod at the top of the intermediate wall: a plurality of hollow grouting anchor rods 3 are vertically arranged on each ring of pilot tunnel primary supports 1 positioned at the top of the intermediate wall, and the hollow grouting anchor rods 3 are utilized to perform grouting on surrounding rocks at the top of the intermediate wall;
in a specific embodiment of the present invention, the step S3 is specifically: 7 primary supports 1 with the length of 3.5m are vertically arranged on each ring of pilot tunnel on the top of the intermediate wall 5
Hollow grouting anchor rod 3, longitudinal spacing(namely the distance between the hollow grouting anchor rods 3 on the pilot hole primary supports 1 in the adjacent rings) is 0.5m, the circumferential distance (namely the distance between the adjacent hollow grouting anchor rods 3 on the pilot hole primary supports 1 in the same ring) is 0.55m, and the 7 hollow grouting anchor rods 3 are arranged in a quincunx shape; and after the hollow grouting anchor rod 3 is qualified, grouting the surrounding rock at the top of the intermediate wall 5 by using the hollow grouting anchor rod 3 and cement paste added with 5% of water glass, wherein the water cement ratio of the cement paste is 1:1, so as to reinforce the surrounding rock at the top of the intermediate wall 5.
Step S4, constructing the steel perforated pipes of the middle partition wall bottom plate: and installing a plurality of steel perforated pipes 4 on the stratum at the bottom of the intermediate wall, inserting one ends of the steel perforated pipes 4 into the stratum at the bottom of the intermediate wall from the bottom plate 2 of the intermediate wall, exposing the other ends of the steel perforated pipes 4, and grouting the stratum at the bottom of the intermediate wall through the steel perforated pipes 4.
In a specific embodiment of the present invention, the step S4 is specifically: installing a plurality of pipes with the length of 3.5m on the stratum at the bottom of the intermediate wall
The bottom stratum of the partition wall is grouted through the steel perforated pipes 4, the longitudinal distance (in the longitudinal direction, the distance between the adjacent steel perforated pipes 4, also can be said to be the distance between the steel perforated pipes 4 positioned in the bottom stratum of the partition wall in the adjacent rings) is 0.5m, the circumferential distance (in the transverse direction, the distance between the adjacent steel perforated pipes 4, also can be said to be the distance between the adjacent steel perforated pipes 4 positioned in the bottom stratum of the partition wall in the same ring) is 0.75m, and the steel perforated pipes 4 positioned on the bottom stratum of the partition wall in one ring are arranged in a quincunx shape; and after the steel perforated pipe 4 is qualified, grouting the stratum at the bottom of the intermediate wall by using the steel perforated pipe 4 and cement paste added with 5% of water glass, wherein the water cement ratio of the cement paste is 1:1, so as to reinforce the stratum at the bottom of the intermediate wall.
Step S5, preparation before construction of the intermediate wall steel bars: and (4) utilizing the total station to discharge the sidelines of the reinforcing steel bars of the intermediate wall, and drawing lines to form reinforcing steel bar sideline marks.
In a specific embodiment of the present invention, the step S5 is specifically: and (3) setting a station by using a total station, discharging a sideline of the steel bar of the intermediate wall, and drawing a line by using red paint to form a steel bar sideline mark.
Step S6, constructing the steel bars of the intermediate wall: after the middle partition wall steel bars are installed according to the steel bar side line marks, the grouting pipes 6 are embedded in the upper portion of the middle partition wall, the grouting pipes 6 are arranged in an inclined mode, and the tops of the grouting pipes 6 are fixed to the middle pilot tunnel primary support 2.
In a specific embodiment of the present invention, the step S6 is specifically: according to the on-site binding or welding of the reinforcing steel bars according to the mark of the side lines of the reinforcing steel bars according to the design drawing, after the acceptance of the reinforcing steel bars of the intermediate wall is qualified, a grouting pipe 6 with the length of 3 meters is longitudinally pre-embedded in every 5 meters on the upper portion of the intermediate wall, the grouting pipe 6 is obliquely crossed with the intermediate wall 5, the number of the grouting pipes 6 in each mould is not less than two, the top of each grouting pipe 6 is bound on an expansion screw by an iron wire, the expansion screw is nailed into the initial support 1 of the intermediate guide hole, the middle of each grouting pipe 6 is bound on the reinforcing steel bars of the intermediate wall by the iron wire, the grouting pipes 6 are prevented from shifting during concrete pouring, and before the grouting pipes 6 are pre-embedded in the upper portion of the intermediate wall, the step of wrapping non-woven geotextile on the top of each grouting pipe 6.
Step S7, preparation before template installation: and (4) utilizing the total station to discharge the sidelines of the intermediate wall 5, and drawing lines to form the intermediate wall sideline marks.
In a specific embodiment of the present invention, the step S7 is specifically: the total station is set up and the sidelines of the intermediate wall 5 are discharged and drawn with red paint to form an intermediate wall sideline mark.
Step S8, template installation: and (3) installing a template of the intermediate wall 5 according to the mark of the side line of the intermediate wall, wherein the template needs to be firmly installed.
In an embodiment of the present invention, in step S8, the mid-partition template is manufactured according to the design drawing of the pilot tunnel, and is transported to the construction site after being processed, and is used after being accepted.
Step S9, pouring concrete: a concrete casting process is performed to form the intermediate wall.
In a specific embodiment of the invention, the reinforced concrete of the intermediate wall adopts C30 concrete and the impermeability grade is P12. Strictly controlling the expansion of the concrete during constructionThe mixing ratio of the concrete and the mixing amount of the expanding agent are adopted, when the intermediate wall 5 is constructed, the intermediate wall 5 is tightly and compactly propped against the top of the intermediate pilot tunnel without leaving a gap, the intermediate wall 5 is completely made of pumping concrete, and the concrete conveying pipe 7 enters the template from the end; the step S9 is specifically: and pouring concrete twice, wherein the height of the concrete is 1.8 m above the bottom plate of the intermediate wall in the first pouring, and the vault is poured in the second pouring. When the concrete is poured to the top of the intermediate wall 5, the concrete is firstly poured from the top
And standing for 15 minutes after the grouting pipe 6 flows out, and shrinking the concrete after the surface floating slurry flows out. Concrete was poured under pressure again for 5 minutes.
Step S10, form removal maintenance and wall top grouting: and (4) removing the template of the intermediate wall, and grouting the intermediate wall through the grouting pipe.
In a specific embodiment of the present invention, in step S10, the intermediate wall 5 is demolded after the concrete strength reaches 70% of the design value after the pouring is completed. When the mold is removed, care should be taken to avoid the phenomena of edge missing and corner falling. After the form is removed, the end wall is subjected to roughening treatment, and the embedded connecting steel bars are firmly welded according to requirements; after the concrete is demolded, carrying out water spraying maintenance on the concrete, wherein the maintenance time is not less than 7 d; and after the formwork stripping of the intermediate wall formwork is finished, grouting is carried out by using an embedded grouting pipe 6, and cement paste with a water cement ratio of 1:1 is adopted. The initial pressure of grouting is 0.5-1 MPa, the final pressure is 2.0MPa, a water pressing experiment is carried out before grouting, and grouting construction can be carried out after whether the pipeline is smooth and whether a grouting opening reaches a sealing standard or not is determined.
Those skilled in the art will appreciate that variations may be implemented by those skilled in the art in combination with the prior art and the above-described embodiments, and will not be described herein in detail. Such variations do not affect the essence of the present invention and are not described herein.
The above description is of the preferred embodiment of the invention. It is to be understood that the invention is not limited to the particular embodiments described above, in that devices and structures not described in detail are understood to be implemented in a manner common in the art; those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments to equivalent variations, without departing from the spirit of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (10)
1. A construction method for a large-section multi-arch tunnel mid-board is characterized by comprising the following steps:
step S1, using a total station to discharge sidelines of the bottom plate of the intermediate wall, and drawing lines to form bottom plate sideline marks;
step S2, pouring the middle partition wall bottom plate concrete according to the bottom plate side line mark;
step S3, vertically installing a plurality of hollow grouting anchor rods on the primary support of each ring of pilot tunnels positioned at the top of the intermediate wall, and grouting surrounding rock at the top of the intermediate wall by using the hollow grouting anchor rods;
step S4, installing a plurality of steel perforated pipes on the bottom stratum of the intermediate wall, and grouting the bottom stratum of the intermediate wall through the steel perforated pipes;
step S5, discharging sidelines of the steel bars of the intermediate wall by using a total station, and drawing lines to form steel bar sideline marks;
step S6, after the middle partition wall steel bars are installed according to the steel bar side line marks, embedding a grouting pipe in the upper portion of the middle partition wall, wherein the grouting pipe is arranged in an inclined mode, and the top of the grouting pipe is fixed on the primary support of the middle pilot tunnel;
step S7, using a total station to discharge sidelines of the intermediate wall, and drawing lines to form an intermediate wall sideline mark;
step S8, installing a template of the intermediate wall according to the intermediate wall sideline mark;
step S9 of performing a concrete casting process to form the intermediate wall;
and step S10, removing the template of the intermediate wall, and grouting the intermediate wall through the grouting pipe.
2. The method of constructing the intermediate wall in the large-section multi-arch tunnel according to claim 1, wherein the bottom plate borderline mark, the reinforcement borderline mark, and the intermediate wall borderline mark are red paints.
3. The method for constructing an intermediate wall in a large-cross-section multi-arch tunnel according to claim 1, wherein in the step S2, before the concrete for the intermediate wall bottom is poured, a step of cleaning scum and accumulated water at the bottom of the intermediate wall is further included.
4. The method for constructing a mid-wall of a large-section multi-arch tunnel according to claim 1, wherein in the step S3, the space between the hollow grouting bolts located on the preliminary supports of the adjacent rings of the middle pilot tunnel is 0.4 to 0.6 m; and the distance between adjacent hollow grouting anchor rods positioned on the primary support of the middle pilot tunnel in the same ring is 0.5-0.6 m.
And (3) grouting the surrounding rock at the top of the partition wall by using the hollow grouting anchor rod by using cement paste added with 5% of water glass, wherein the water-cement ratio of the cement paste is 1: 1.
5. The method for constructing a partition wall in a large-section multi-arch tunnel according to claim 1, wherein a distance between adjacent steel perforated pipes in a longitudinal direction is 0.4 to 0.6 m; in the transverse direction, the distance between every two adjacent steel perforated pipes is 0.7-0.8 m;
and (3) grouting the stratum at the bottom of the partition wall by using the steel perforated pipe and cement paste added with 5% of water glass, wherein the water-cement ratio of the cement paste is 1: 1.
6. The method for constructing an intermediate wall of a large-section multi-arch tunnel according to claim 1, wherein a distance between adjacent grouting pipes is 4 to 6m, and at least 2 grouting pipes are provided per mold of the intermediate wall.
7. The method for constructing an intermediate wall of a large-cross-section multi-arch tunnel according to claim 1, wherein the step of embedding a grout pipe in an upper portion of the intermediate wall in step S6 includes:
binding the top of the grouting pipe on an expansion screw by using an iron wire, wherein the expansion screw is arranged on the primary support of the middle pilot tunnel;
and binding the middle part of the grouting pipe on the steel bars of the intermediate wall.
8. The method for constructing an intermediate wall in a large-cross-section multi-arch tunnel according to claim 1, wherein the step S6 further comprises a step of wrapping a non-woven geotextile on top of the grouting pipe before the grouting pipe is embedded in the upper portion of the intermediate wall.
9. The construction method of the intermediate wall of the large-section multi-arch tunnel according to claim 1, wherein the step S9 specifically includes:
performing a first concrete pouring process, and pouring concrete to a position 1.7-1.9 m above the bottom plate;
and performing a second concrete pouring process, pouring concrete to the top of the intermediate wall, standing for 12-18 minutes after the concrete flows out of the grouting pipe for the first time when the concrete is poured to the top of the intermediate wall, and performing pressure pouring for 3-5 minutes again until the concrete flows out of the grouting pipe.
10. The method of constructing an intermediate wall in a large-section multi-arch tunnel according to claim 1, wherein in the step S10, the intermediate wall is grouted with cement paste having a water cement ratio of 1:1 through the grouting pipes;
wherein the initial pressure of the grouting is 0.5-1 MPa, and the final pressure is 1.8-2.2 MPa.
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