CN111075477A - Semi-rigid supporting structure system of large-section soft rock tunnel and construction method of semi-rigid supporting structure system - Google Patents
Semi-rigid supporting structure system of large-section soft rock tunnel and construction method of semi-rigid supporting structure system Download PDFInfo
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- CN111075477A CN111075477A CN202010052078.3A CN202010052078A CN111075477A CN 111075477 A CN111075477 A CN 111075477A CN 202010052078 A CN202010052078 A CN 202010052078A CN 111075477 A CN111075477 A CN 111075477A
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- 230000008093 supporting effect Effects 0.000 title claims abstract description 164
- 239000011435 rock Substances 0.000 title claims abstract description 36
- 238000010276 construction Methods 0.000 title claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 67
- 239000010959 steel Substances 0.000 claims abstract description 67
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 13
- 239000004567 concrete Substances 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 11
- 238000009412 basement excavation Methods 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 230000005641 tunneling Effects 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000011378 shotcrete Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000011431 lime mortar Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- 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
- E21D20/00—Setting anchoring-bolts
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- Mining & Mineral Resources (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a semi-rigid supporting structure system of a large-section soft rock tunnel and a construction method thereof, and solves the problem of poor supporting effect of the soft rock tunnel in the prior art. The lining structure comprises a primary semi-rigid supporting structure and a secondary lining supporting structure, wherein the secondary lining supporting structure is positioned inside the primary semi-rigid supporting structure and is attached to the primary semi-rigid supporting structure; the initial semi-rigid supporting structure is a semi-rigid steel frame supporting structure or a semi-rigid pipe sheet supporting structure. The large-section soft rock tunnel supporting structure system provided by the invention is a semi-rigid support, and the supporting rigidity is between that of a flexible support and that of a steel support; on one hand, the primary tunnel supporting structure system allows the surrounding rock to deform to a certain degree; on the other hand, the special reinforced concrete prefabricated segment can be assembled by a segment assembling machine, the supporting effect is good, the adaptability is strong, and the supporting safety coefficient is improved.
Description
Technical Field
The invention relates to the technical field of soft rock tunnel support, in particular to a semi-rigid support structure system of a large-section soft rock tunnel and a construction method thereof.
Background
The large-section soft rock tunnel usually adopts a new Olympic method and a full-section tunnel tunneling machine method. The new Austrian method is a construction method based on rock bearing theory, which combines an anchor rod and sprayed concrete to form a tunnel supporting structure, and adds a secondary lining to form a tunnel supporting structure system together when necessary. The existing new Austrian method is the most common construction method for the large-section soft rock tunnel, but has the limitations of complex construction procedures, large deformation of a supporting structure, poor construction operation environment, low safety, low efficiency and the like, and needs to be further improved and perfected.
The shield method is a construction method for tunnel construction by using a full-face tunnel boring machine. In a soft rock tunnel, a hob on a cutter head is used for extruding and shearing broken rocks, and reinforced concrete segments are mainly spliced into a ring to form a supporting structure system. The existing full-section tunnel tunneling machine method is the future development direction of a large-section soft rock tunnel construction method, but has the defects of high manufacturing cost, large construction difficulty of a non-circular tunnel, limited excavation radius, poor complex geological adaptability and the like, so that the application of the full-section tunnel tunneling machine method in the large-section soft rock tunnel construction is greatly limited.
The anchor-shotcrete supporting structure is flexible supporting, the reinforced concrete supporting structure is rigid supporting, the former allows the supporting structure to deform, and the latter does not strictly allow the supporting structure to deform. Therefore, how to provide a supporting structure system which can ensure rapidness, high efficiency, safety and environmental protection and also allow the supporting structure system to be properly deformed becomes a problem to be solved in the field.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a semi-rigid supporting structure system of a large-section soft rock tunnel and a construction method thereof, and solves the problem of poor supporting effect of the soft rock tunnel in the prior art.
The technical scheme of the invention is realized as follows: a large-section soft rock tunnel semi-rigid supporting structure system comprises a primary semi-rigid supporting structure and a secondary lining supporting structure, wherein the secondary lining supporting structure is positioned inside the primary semi-rigid supporting structure and is attached to the primary semi-rigid supporting structure; the initial semi-rigid supporting structure is a semi-rigid steel frame supporting structure or a semi-rigid pipe sheet supporting structure.
The semi-rigid steel frame supporting structure comprises special prefabricated pipe pieces and section steel, wherein the section steel is supported on the upper section of the tunnel, the special prefabricated pipe pieces are supported on the lower section of the tunnel, and the section steel is connected with the special prefabricated pipe pieces through annular deformation pieces; and the section steel is provided with a steel bar net and a vertically arranged anchor rod.
The semi-rigid pipe piece supporting structure comprises an upper semi-ring pipe piece and a lower semi-ring pipe piece, wherein the upper semi-ring pipe piece is supported on the upper section of the tunnel, the lower semi-ring pipe piece is supported on the lower section of the tunnel, and the upper semi-ring pipe piece is connected with the lower semi-ring pipe piece through a circumferential deformation piece; the upper semi-ring duct piece and the lower semi-ring duct piece are composed of special prefabricated duct pieces connected end to end.
The special prefabricated section of jurisdiction includes the basis steelframe, and concreting forms concrete segment portion on the basis steelframe, and the concrete segment portion formation reservation joint is stretched out respectively at the both ends of basis steelframe, and the reservation joint between two adjacent special prefabricated section of jurisdiction is connected.
And the concrete pipe piece part is provided with an embedded anchor rod hole, and an anchor rod is fixedly arranged in the embedded anchor rod hole.
The concrete pipe piece part is provided with a reserved bolt hole which is axially arranged, and two axially adjacent concrete pipe piece parts are connected through a bolt which penetrates through the reserved bolt hole.
The secondary lining supporting structure is a duct piece supporting layer or a cast-in-place concrete layer.
A construction method of a semi-rigid supporting structure system of a large-section soft rock tunnel comprises the following steps:
s1: adopting a tunnel boring machine to carry out tunnel excavation;
s2: a segment erector on a tunnel boring machine assembles a semi-rigid steel frame supporting structure or a semi-rigid segment supporting structure for an excavated tunnel;
s3: performing concrete pouring on the semi-rigid steel frame supporting structure or the semi-rigid pipe sheet supporting structure in the step S2 to ensure that the inner surface of the semi-rigid supporting structure in the initial stage is smooth;
s4: and (5) splicing the segments by using a segment assembling machine or performing cast-in-place reinforced concrete construction by using a template trolley in the initial semi-rigid supporting structure in the step S3, and supporting a secondary lining supporting structure.
The semi-rigid steel frame supporting structure assembling step in the step S2 is as follows:
s2.1a: splicing special prefabricated pipe pieces on a lower section of an excavated tunnel by a pipe piece splicing machine on a tunnel boring machine, wherein reserved joints of two adjacent special prefabricated pipe pieces on the same ring are connected by bolts;
s2.2a: installing profile steel on the upper section of the excavated tunnel, fixing adjacent profile steel through connecting reinforcing steel bars, and then connecting and fixing the profile steel and the special prefabricated segment through a circumferential deformation piece;
s2.3a: laying a steel bar mesh on the profile steel, installing an anchor rod, and then pouring concrete on the laid steel bar mesh and the reserved joint to ensure that the inner surface of the primary semi-rigid supporting structure is smooth and complete the assembly of the primary semi-rigid supporting structure;
s2.4a: and (4) after the concrete poured in the step S2.3a is solidified, paving a waterproof layer on the inner surface of the primary semi-rigid supporting structure for fitting construction with a secondary lining supporting structure.
The semi-rigid pipe sheet supporting structure assembling step in the step S2 is as follows:
s2.1b: a segment erector on the tunnel boring machine erects the upper half ring segment on the upper section of the excavated tunnel, and the reserved joints of two adjacent special prefabricated segments are connected through bolts;
s2.2b: splicing the lower semi-ring duct pieces on the lower section of the excavated tunnel, and connecting the reserved joints of two adjacent special prefabricated duct pieces through bolts; then, connecting and fixing the upper semi-ring duct piece and the lower semi-ring duct piece by using a circumferential deformation piece;
s2.3b: and (3) mounting anchor rods on the upper semi-ring duct piece and the lower semi-ring duct piece, and then pouring concrete at the reserved joints to ensure that the inner surface of the initial semi-rigid supporting structure is smooth and complete the assembly of the initial semi-rigid supporting structure.
The large-section soft rock tunnel supporting structure system provided by the invention is a semi-rigid support, and the supporting rigidity is between that of a flexible support and that of a steel support; on one hand, the primary tunnel supporting structure system allows the surrounding rock to deform to a certain degree; on the other hand, the special reinforced concrete prefabricated segment can be assembled by a segment assembling machine, has the self-bearing capacity of a new Austrian method on surrounding rocks, has the capacity of high self-rigidity of a segment structure in a tunneling method, has good supporting effect and strong adaptability, and improves the supporting safety coefficient. In addition, the secondary lining supporting structure system is tightly attached to the primary tunnel supporting structure, not only can be cast in place by adopting a template trolley, but also can be spliced by adopting a segment splicing machine, so that the construction efficiency is greatly improved, the secondary lining supporting structure system is a great innovation for soft rock tunnel construction, and has higher popularization value.
Drawings
In order to illustrate the embodiments of the invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort.
FIG. 1 is a three-dimensional schematic of the present invention in example 1.
Fig. 2 is a schematic front view of the present invention in embodiment 1.
FIG. 3 is a three-dimensional schematic view of the construction state of the present invention in example 1.
FIG. 4 is a schematic side view of the construction state of the present invention in example 1.
Fig. 5 is a three-dimensional schematic view of the present invention in example 2.
Fig. 6 is a schematic front view of the present invention in embodiment 2.
FIG. 7 is a three-dimensional schematic view of the construction state of the present invention in example 2.
FIG. 8 is a schematic side view showing the construction state of the present invention in example 2.
Fig. 9 is a schematic view showing a connection state of the hoop deformation member.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1 to 4, in example 1, a large-section soft rock tunnel semi-rigid supporting structure system comprises a primary semi-rigid supporting structure 1 and a secondary lining supporting structure 2, wherein the secondary lining supporting structure 2 is positioned inside the primary semi-rigid supporting structure 1 and is attached to the primary semi-rigid supporting structure 1, and the primary semi-rigid supporting structure 1 is in contact with a tunnel and is used for first-layer supporting of tunnel supporting; and the secondary lining supporting structure 2 is positioned inside the whole ring of the primary semi-rigid supporting structure 1 and is used for secondary layer supporting of tunnel supporting. The initial semi-rigid supporting structure 1 is a semi-rigid steel frame supporting structure or a semi-rigid pipe sheet supporting structure, and has certain flexibility while ensuring that the initial semi-rigid supporting structure 1 has supporting strength. The secondary lining supporting structure 2 is a duct piece supporting layer or a cast-in-place concrete layer. The segment supporting layer is an assembly support of a conventional segment; the cast-in-place concrete layer is a supporting layer cast by adopting concrete. The section structure form of the secondary lining supporting structure comprises but is not limited to a common reinforced concrete segment structure, a cast-in-place reinforced concrete structure and a cast-in-place reinforced concrete structure.
Further, the semi-rigid steel frame supporting structure comprises special prefabricated pipe pieces 6 and section steel 4, the section steel 4 is supported on the upper section of the tunnel, the special prefabricated pipe pieces 6 are supported on the lower section of the tunnel, and the special reinforced concrete pipe pieces have certain strength, rigidity and stability and can be used as hydraulic supports of tunnel boring machines. The section steel 4 is connected with the special prefabricated segment 6 through a circumferential deformation piece 8; the annular deformation device of the primary support structure system can be arranged according to engineering requirements, and can also be not arranged. The annular deformation piece is a device which can be arranged between the reserved joints of the special prefabricated duct pieces and can ensure that the initial semi-rigid supporting structure is properly deformed (0-500 mm). The form of the circumferential deformation member of the preliminary semi-rigid supporting structure is not limited. And a steel bar mesh 5 and a vertically arranged anchor rod 3 are arranged on the section steel 4. The connection mode of the reinforcing mesh sheets among the pipe pieces comprises lap joint, welding and mechanical connection.
As shown in fig. 5 to 9, in example 2, a semi-rigid supporting structure system of a large-section soft rock tunnel comprises an upper semi-ring segment 12 and a lower semi-ring segment 13, wherein the upper semi-ring segment 12 is supported on an upper section of the tunnel, the lower semi-ring segment 13 is supported on a lower section of the tunnel, and the upper semi-ring segment 12 is connected with the lower semi-ring segment 13 through a circumferential deformation piece 8; the upper semi-ring segment 12 and the lower semi-ring segment 13 are both composed of special prefabricated segments 6 connected end to end. The special prefabricated pipe piece is a reinforced concrete structure with a pre-embedded reinforced net piece, section steel (or a grid steel frame) and a special joint. The reserved joint ranges reserved on the two sides of the special duct piece are 10-500 mm towards the two sides of the annular duct piece respectively. The special prefabricated duct pieces can be assembled by a duct piece assembling system of the tunnel boring machine. The special prefabricated pipe piece can be pre-buried in anchor rod holes, grouting holes, bolt holes and the like as required.
Further, the special prefabricated duct pieces 6 comprise foundation steel frames 6-1, the foundation steel frames 6-1 are steel frames formed by reinforcing mesh sheets, section steel (or grid steel frames) and joints, concrete is poured on the foundation steel frames 6-1 to form concrete duct piece portions 6-2, two ends of each foundation steel frame 6-1 extend out of the concrete duct piece portions 6-2 to form reserved joints 7, and the reserved joints 7 between every two adjacent special prefabricated duct pieces 6 are connected. The reserved joint is arranged between the special prefabricated pipe pieces or between the special prefabricated pipe pieces and the annular deformation piece. The reserved joint is a section steel joint or a grating steel frame joint. Joint forms include, but are not limited to, Z-weld joints, reinforced steel plate butt weld joints, end plate bolted joints.
Further, the concrete pipe piece part 6-2 is provided with an embedded anchor rod hole 9, an anchor rod 3 is fixedly arranged in the embedded anchor rod hole 9, and the anchor rod is fixed on the concrete pipe piece part through a bolt. The concrete pipe piece parts 6-2 are provided with reserved bolt holes 10 which are axially arranged, and two concrete pipe piece parts 6-2 which are axially adjacent are connected through bolts which penetrate through the reserved bolt holes 10, so that the connection of special prefabricated pipe pieces in adjacent rings is realized.
The other structure is the same as embodiment 1.
Example 3: a construction method of a semi-rigid supporting structure system of a large-section soft rock tunnel comprises the following steps:
s1: adopting a tunnel boring machine to carry out tunnel excavation;
s2: a segment erector on a tunnel boring machine assembles a semi-rigid steel frame supporting structure or a semi-rigid segment supporting structure for an excavated tunnel, constructs a semi-rigid supporting structure at the initial stage, and supports the tunnel for a first layer;
s3: performing concrete pouring on the semi-rigid steel frame supporting structure or the semi-rigid pipe sheet supporting structure in the step S2 to ensure that the inner surface of the initial semi-rigid supporting structure 1 is smooth; after the full section of the initial semi-rigid supporting structure is finished, and after the initial semi-rigid supporting structure and the annular deformation piece are subjected to preset deformation, adopting concrete to cast the reserved joint range of the special prefabricated duct piece, and casting the annular deformation device;
s4: in the initial semi-rigid supporting structure 1 in step S3, segment assembling is performed by using a segment assembling machine or cast-in-place reinforced concrete construction is performed by using a formwork trolley, and supporting construction of the secondary lining supporting structure 2 is performed. And when the secondary lining supporting structure adopts a duct piece assembling structural form, filling mortar into a gap between the primary semi-rigid supporting structure and the secondary lining supporting structure. The mortar includes, but is not limited to, cement mortar, lime mortar, cement lime mortar, clay mortar.
The semi-rigid steel frame supporting structure assembling step in the step S2 is as follows:
s2.1a: a segment erector on a tunnel boring machine erects special prefabricated segments 6 on the lower section of an excavated tunnel, and reserved joints 7 of two adjacent special prefabricated segments 6 on the same ring are connected through bolts;
s2.2a: installing the section steel 4 on the upper section of the excavated tunnel, fixing the adjacent section steel 4 through connecting reinforcing steel bars 11, and then connecting and fixing the section steel 4 and the special prefabricated segment 6 by using a circumferential deformation piece 8; the connection mode of the section steel 4 and the special prefabricated segment 6 by the annular deformation piece 8 is a bolt and welding mode;
s2.3a: paving a steel mesh 5 on the section steel 4, installing an anchor rod 3, and then pouring concrete on the paved steel mesh 5 and the reserved joint 7 to ensure that the inner surface of the initial semi-rigid supporting structure 1 is smooth and complete the assembly of the initial semi-rigid supporting structure 1;
s2.4a: and (4) after the concrete poured in the step S2.3a is solidified, paving a waterproof layer on the inner surface of the primary semi-rigid supporting structure 1 for fitting construction with the secondary lining supporting structure 2. The upper section of the initial semi-rigid supporting structure needs to be constructed by spraying concrete, and the upper section is guaranteed to be sprayed with concrete to form a closed section together with the special prefabricated duct piece 6. And a waterproof layer is arranged between the initial semi-rigid supporting structure and the tunnel secondary lining supporting structure 2 so as to ensure the structural safety. The tunnel secondary lining support structure 2 is constructed in close proximity to a waterproof layer, in this embodiment a cast-in-place reinforced concrete structure.
The semi-rigid pipe sheet supporting structure assembling step in the step S2 is as follows:
s2.1b: a segment erector on a tunnel boring machine erects an upper semi-ring segment 12 on the upper section of an excavated tunnel, and reserved joints 7 of two adjacent special prefabricated segments 6 are connected through bolts;
s2.2b: splicing a lower semi-ring duct piece 13 on the lower section of the excavated tunnel, and connecting reserved joints 7 of two adjacent special prefabricated duct pieces 6 through bolts; then, the upper half-ring segment 12 and the lower half-ring segment 13 are fixedly connected by a ring-shaped deformation piece 8;
s2.3b: and (3) installing anchor rods 3 on the upper semi-ring duct piece 12 and the lower semi-ring duct piece 13, and then pouring concrete on the reserved joints 7 to ensure that the inner surface of the initial semi-rigid supporting structure 1 is smooth, so that the assembly of the initial semi-rigid supporting structure 1 is completed. After the primary tunnel supporting structure 1 is assembled into a ring, the reserved joint 7 can be filled with sprayed concrete so as to ensure that the inner surface of the primary tunnel supporting structure 1 is basically smooth.
The other structure is the same as embodiment 2.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a big section soft rock tunnel semi-rigid supporting construction system which characterized in that: the lining structure comprises a primary semi-rigid supporting structure (1) and a secondary lining supporting structure (2), wherein the secondary lining supporting structure (2) is positioned in the primary semi-rigid supporting structure (1) and is attached to the primary semi-rigid supporting structure (1); the initial semi-rigid supporting structure (1) is a semi-rigid steel frame supporting structure or a semi-rigid pipe sheet supporting structure.
2. The semi-rigid supporting structure system of the large-section soft rock tunnel according to claim 1, characterized in that: the semi-rigid steel frame supporting structure comprises special prefabricated pipe pieces (6) and section steel (4), the section steel (4) is supported on the upper section of a tunnel, the special prefabricated pipe pieces (6) are supported on the lower section of the tunnel, and the section steel (4) is connected with the special prefabricated pipe pieces (6) through annular deformation pieces (8); and a steel bar mesh (5) and a vertically arranged anchor rod (3) are arranged on the section steel (4).
3. The semi-rigid supporting structure system of the large-section soft rock tunnel according to claim 1, characterized in that: the semi-rigid pipe sheet supporting structure comprises an upper semi-ring pipe sheet (12) and a lower semi-ring pipe sheet (13), wherein the upper semi-ring pipe sheet (12) is supported on the upper section of a tunnel, the lower semi-ring pipe sheet (13) is supported on the lower section of the tunnel, and the upper semi-ring pipe sheet (12) is connected with the lower semi-ring pipe sheet (13) through a circumferential deformation piece (8); the upper semi-ring duct piece (12) and the lower semi-ring duct piece (13) are both composed of special prefabricated duct pieces (6) which are connected end to end.
4. The semi-rigid supporting structure system of the large-section soft rock tunnel according to claim 2 or 3, wherein: the special prefabricated segment (6) comprises a foundation steel frame (6-1), concrete is poured on the foundation steel frame (6-1) to form a concrete segment (6-2), two ends of the foundation steel frame (6-1) extend out of the concrete segment (6-2) respectively to form a reserved joint (7), and the reserved joints (7) between two adjacent special prefabricated segments (6) are connected.
5. The large-section soft rock tunnel semi-rigid supporting structure system according to claim 4, characterized in that: and the concrete pipe piece part (6-2) is provided with an embedded anchor rod hole (9), and an anchor rod (3) is fixedly arranged in the embedded anchor rod hole (9).
6. The semi-rigid supporting structure system of the large-section soft rock tunnel according to claim 5, characterized in that: the concrete pipe piece parts (6-2) are provided with reserved bolt holes (10) which are axially arranged, and two concrete pipe piece parts (6-2) which are axially adjacent are connected through bolts penetrating through the reserved bolt holes (10).
7. The semi-rigid supporting structure system of the large-section soft rock tunnel according to claim 1 or 6, wherein: the secondary lining supporting structure (2) is a duct piece supporting layer or a cast-in-place concrete layer.
8. A construction method of the semi-rigid supporting structure system of the large-section soft rock tunnel according to claim 7, characterized by comprising the following steps: the method comprises the following steps:
s1: adopting a tunnel boring machine to carry out tunnel excavation;
s2: a segment erector on a tunnel boring machine assembles a semi-rigid steel frame supporting structure or a semi-rigid segment supporting structure for an excavated tunnel;
s3: performing concrete pouring on the semi-rigid steel frame supporting structure or the semi-rigid pipe sheet supporting structure in the step S2 to ensure that the inner surface of the initial semi-rigid supporting structure (1) is smooth;
s4: and (5) splicing the segments by using a segment splicing machine or performing cast-in-place reinforced concrete construction by using a template trolley in the primary semi-rigid supporting structure (1) in the step S3, and supporting the secondary lining supporting structure (2).
9. The construction method of the semi-rigid supporting structure system of the large-section soft rock tunnel according to claim 8, characterized in that: the semi-rigid steel frame supporting structure assembling step in the step S2 is as follows:
s2.1a: a segment erector on a tunnel boring machine erects special prefabricated segments (6) on the lower section of an excavated tunnel, and reserved joints (7) of two adjacent special prefabricated segments (6) on the same ring are connected through bolts;
s2.2a: installing the section steel (4) on the upper section of the excavated tunnel, fixing the adjacent section steel (4) through connecting reinforcing steel bars (11), and then connecting and fixing the section steel (4) and the special prefabricated segment (6) through a circumferential deformation piece (8);
s2.3a: paving a steel bar mesh (5) on the section steel (4), installing an anchor rod (3), and then pouring concrete on the steel bar mesh (5) and the reserved joint (7), so as to ensure that the inner surface of the initial semi-rigid supporting structure (1) is smooth and complete the assembly of the initial semi-rigid supporting structure (1);
s2.4a: and (4) after the concrete poured in the step S2.3a is solidified, paving a waterproof layer on the inner surface of the primary semi-rigid supporting structure (1) for fitting construction with the secondary lining supporting structure (2).
10. The construction method of the semi-rigid supporting structure system of the large-section soft rock tunnel according to claim 8, characterized in that: the semi-rigid pipe sheet supporting structure assembling step in the step S2 is as follows:
s2.1b: a segment erector on a tunnel boring machine erects an upper semi-ring segment (12) on the upper section of an excavated tunnel, and reserved joints (7) of two adjacent special prefabricated segments (6) are connected through bolts;
s2.2b: splicing a lower semi-ring duct piece (13) on the lower section of the excavated tunnel, and connecting reserved joints (7) of two adjacent special prefabricated duct pieces (6) through bolts; then, the upper semi-ring duct piece (12) and the lower semi-ring duct piece (13) are fixedly connected by a ring-shaped deformation piece (8);
s2.3b: and (3) installing anchor rods on the upper semi-ring duct piece (12) and the lower semi-ring duct piece (13), and then pouring concrete at the reserved joints (7) to ensure that the inner surface of the initial semi-rigid supporting structure (1) is smooth and complete the assembly of the initial semi-rigid supporting structure (1).
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111456757A (en) * | 2020-04-30 | 2020-07-28 | 中铁隧道集团二处有限公司 | Construction method for preventing large-section tunnel lining reinforcing steel bars from collapsing |
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| CN113417669A (en) * | 2021-07-29 | 2021-09-21 | 中铁隧道集团一处有限公司 | Lining construction method for side wall cast-in-place and arch prefabricated segment spherical joint assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111456757A (en) * | 2020-04-30 | 2020-07-28 | 中铁隧道集团二处有限公司 | Construction method for preventing large-section tunnel lining reinforcing steel bars from collapsing |
| CN113027488A (en) * | 2021-04-07 | 2021-06-25 | 中交一公局集团有限公司 | Support method small-radius lining structure and construction method |
| CN112983450A (en) * | 2021-05-11 | 2021-06-18 | 北京中矿创新联盟能源环境科学研究院 | Tunnel rock burst control type TBM system and method |
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| CN112983450B (en) * | 2021-05-11 | 2021-10-15 | 北京中矿创新联盟能源环境科学研究院 | Tunnel rock burst control type TBM system and method |
| CN113417669A (en) * | 2021-07-29 | 2021-09-21 | 中铁隧道集团一处有限公司 | Lining construction method for side wall cast-in-place and arch prefabricated segment spherical joint assembly |
| CN113417669B (en) * | 2021-07-29 | 2023-12-15 | 中铁隧道集团一处有限公司 | Lining construction method for cast-in-situ side wall and assembling arch prefabricated segment spherical joint |
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