CN115110966B - Tunnel supporting structure and construction method - Google Patents
Tunnel supporting structure and construction method Download PDFInfo
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- CN115110966B CN115110966B CN202211043810.6A CN202211043810A CN115110966B CN 115110966 B CN115110966 B CN 115110966B CN 202211043810 A CN202211043810 A CN 202211043810A CN 115110966 B CN115110966 B CN 115110966B
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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
- E21D11/08—Lining with building materials with preformed concrete slabs
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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
- E21D11/08—Lining with building materials with preformed concrete slabs
- E21D11/083—Methods or devices for joining adjacent concrete segments
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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
Abstract
The invention provides a tunnel supporting structure and a construction method, which are used for solving the problem that when surrounding rocks in a soft soil stratum are faced in the prior art, a tunnel supporting structure with higher rigidity is adopted in tunnel construction to strongly resist the deformation of the surrounding rocks, so that the pressure accumulation of the surrounding rocks is easily caused, and the support is fragile and damaged; the method comprises the following steps: the device comprises an arc-shaped pipe sheet assembly, a reinforcing material and a foot locking anchor rod; the arc-shaped pipe sheet assembly comprises an arc-shaped inner plate, an arc-shaped middle plate and an arc-shaped outer plate, the arc-shaped inner plate is fixedly connected with the arc-shaped middle plate through a reinforcing rib, and the arc-shaped middle plate is connected with the arc-shaped outer plate in a floating mode through an elastic part. The arc pipe sheet assemblies are annularly spliced, the arc middle plates are spliced into a second supporting layer, the arc outer plates are spliced into an elastic supporting layer, the elastic supporting layer is tightly attached to the tunnel rock body, the first supporting layer and the second supporting layer enclose an annular grouting space, and the reinforcing material is filled in the annular grouting space.
Description
Technical Field
The invention belongs to the technical field of tunnel construction, and particularly relates to a tunnel supporting structure and a construction method.
Background
With the rapid development of infrastructure construction in China in recent years, tunnel engineering built in the engineering of constructing highways, railways, water conservancy and the like is increased. The complexity and risk in the tunnel engineering construction process put higher requirements on the safety and practicability of the tunnel engineering lining structure; the tunnel construction is different in supporting structure and construction method adopted by facing different surrounding rocks, wherein the mechanical properties of weak surrounding rocks are greatly different from those of common surrounding rocks due to the characteristics of low strength, broken rock bodies, poor occurrence environment and the like. After the tunnel is excavated, the ground stress is redistributed, and due to the low strength of weak surrounding rocks and the extreme sensitivity to engineering disturbance, plastic zones are generated under the condition of tension or compression, so that the surrounding rocks and the support deform, and engineering disasters such as vault collapse, tunnel face instability, bottom plate bulge, long-time continuous deformation or unconvergence of deformation, serious deformation invasion limit of primary support, water burst and the like are easy to occur under the condition of rich water.
The soft soil stratum surrounding rock belongs to common soft surrounding rock, has poor self-stabilizing capability and low bearing capacity, is easy to generate collapse after excavation, even generates mud gushing phenomenon, and causes that the construction can not be normally carried out. For example, the engineering of the first-standard second-work area of No. 6 line of urban rail transit of Changchun city adopts the total length 455M of an M double-arch constructed underground tunnel, the main penetrating stratum structure of the underground tunnel section is filled with miscellaneous earth, silty clay, silt and completely weathered mudstone, the upper supporting structure and the upper surrounding rock of the tunnel are integrally sunk due to insufficient bearing capacity of the foundation of the arch foot surrounding rock, and the ground subsidence is difficult to control; in addition, after the tunnel is excavated, before the initial construction and the support effect are generated, the surrounding rock can move into the tunnel quickly due to the rheological property of the surrounding rock, so that large deformation is generated, the ground subsides are further caused, and the construction progress is slow. Therefore, the self-stability of the soft soil stratum is poor, the ground settlement treatment is very complicated due to low bearing capacity, and the construction period and the quality cannot be guaranteed. At present, a supporting structure with high rigidity is often adopted in engineering to strongly resist deformation, however, in places with large deformation of surrounding rocks, if a primary support with high structural rigidity is adopted, the deformation of the surrounding rocks still cannot be resisted, and the surrounding rock pressure is accumulated to a certain stage and can generate brittle damage to the support with high rigidity when falling over.
Disclosure of Invention
In view of the above disadvantages of the prior art, the present invention aims to provide a tunnel supporting structure and a construction method thereof, which are used for solving the problem that when the prior art faces surrounding rocks in a soft soil stratum, the tunnel supporting structure with high rigidity is adopted in tunnel construction to strongly "resist" the deformation of the surrounding rocks, so that the pressure accumulation of the surrounding rocks is easily caused, and the support is fragile and damaged.
To achieve the above and other related objects, the present invention provides a tunnel supporting structure, including: the device comprises an arc-shaped pipe sheet assembly, a reinforcing material and a foot locking anchor rod; a plurality of arc-shaped pipe sheet assemblies are annularly spliced; the arc-shaped pipe sheet assembly comprises an arc-shaped inner plate, an arc-shaped middle plate and an arc-shaped outer plate, wherein the arc-shaped inner plate is fixedly connected with the arc-shaped middle plate through a reinforcing rib, and the arc-shaped middle plate is connected with the arc-shaped outer plate through an elastic part in a floating mode.
The adjacent arc-shaped inner plates are fixedly connected, the adjacent arc-shaped middle plates are fixedly connected, the adjacent arc-shaped outer plates are movably connected, the arc-shaped inner plates are spliced to form a first supporting layer, the arc-shaped middle plates are spliced to form a second supporting layer, the arc-shaped outer plates are spliced to form an elastic supporting layer, the elastic supporting layer is tightly attached to a tunnel rock mass, and the first supporting layer and the second supporting layer enclose an annular grouting space; the annular grouting space is filled with the reinforcing material.
The arc inner panel, the arc middle plate with all be provided with the anchor rod hole on the arc planking, the lock foot stock passes the arc inner panel, the arc middle plate with on the arc planking the anchor rod hole, arc sheet pipe subassembly with the tunnel rock mass passes through lock foot stock fixed connection.
Optionally, the elastic member includes a plurality of arc-shaped elastic steel plates, one end of each arc-shaped elastic steel plate in the bending direction is fixedly connected to the arc-shaped outer plate, and the other end of each arc-shaped elastic steel plate in the bending direction is fixedly connected to the arc-shaped middle plate.
Optionally, the reinforcing ribs are arranged along the bending direction of the arc-shaped inner plate, and a plurality of the reinforcing ribs are arranged in parallel.
Optionally, an elastic grouting material is filled between the second support layer and the elastic support layer.
Optionally, the arc-shaped pipe sheet assembly further comprises a corrugated steel plate, the corrugated steel plate is fixedly connected with the arc-shaped outer plate, the corrugated steel plates are arranged at two ends of the arc-shaped outer plate, and the corrugated steel plates on the adjacent arc-shaped pipe sheet assemblies are in contact with each other.
Optionally, a connecting rib is arranged between two adjacent arc pipe sheet assemblies, one end of the connecting rib is fixedly connected with the arc inner plate or/and the arc middle plate of one of the arc pipe sheet assemblies, and the other end of the connecting rib extends into a position between the arc middle plate and the arc inner plate of the other arc pipe sheet assembly.
Optionally, in the length direction of the tunnel, two adjacent arc-shaped pipe sheet assemblies are spliced by adopting a staggered seam.
Optionally, tunnel supporting construction still includes interim stull and interim stull, and in the work progress, interim stull with interim stull cooperation is right the pipe sheet subassembly of arc forms interim support, interim stull forms interim inverted arch, interim stull forms interim partition wall, interim stull with the pipe sheet subassembly of arc encloses into the tunnelling space.
Optionally, the temporary transverse strut and the temporary vertical strut both comprise supporting blocks and connecting blocks, adjacent supporting blocks are connected by adopting a mortise-tenon joint structure, and the connecting blocks span the connecting joints of two adjacent supporting blocks and are respectively and fixedly connected with the two supporting blocks.
A construction method of a tunnel support comprises the following steps:
a region dividing step: measuring and lofting, and planning a tunnel section into an upper area and a lower area, wherein the upper area and the lower area respectively comprise at least one chamber in the horizontal direction;
pre-curing: arranging a small advanced guide pipe at the arch top of the tunnel and grouting for reinforcement;
excavating: excavating from the cavern at one side of the upper region of the tunnel, and after the excavation of all caverns in the upper region is finished, excavating sequentially from one side of the lower region;
a support step: after a chamber is dug, the arc-shaped pipe sheet assembly is installed along a tunnel rock mass, the arc-shaped outer plate is in contact with the tunnel rock mass, a locking anchor rod is arranged on the arc-shaped pipe sheet assembly, and a temporary cross brace and a temporary vertical brace are installed, so that the arc-shaped pipe sheet assembly, the temporary cross brace and the temporary vertical brace form a complete closed-loop support, and after the support is completed, the next chamber is dug;
grouting: after all caverns are excavated, the arc-shaped pipe sheet assemblies are spliced into a complete ring, and a reinforcing material is injected between the first supporting layer and the second supporting layer; and removing all the temporary cross braces and the temporary vertical braces after the reinforcing material is solidified.
As described above, the tunnel supporting structure and the construction method of the present invention have at least the following beneficial effects:
1. through arc pipe sheet subassembly concatenation forms first supporting layer second supporting layer and elastic support layer, three supporting layer form the tunnel and strut the effect, and arc pipe sheet subassembly adopts preparation in advance, and on-the-spot concatenation, simple to operate uses manpower sparingly, and is efficient, works as after the arc pipe sheet subassembly is assembled, first supporting layer with pour into reinforced material into between the second supporting layer into, whole loop configuration forms a whole, and bearing capacity is strong.
2. Through the elastic supporting layer can release surrounding rock deformation pressure, reduces the internal force of supporting construction's structure to guarantee supporting construction's stability, thereby avoided surrounding rock pressure accumulation to arouse that the support produces brittle failure, guarantee construction operation personnel's safety.
3. Because the arc-shaped pipe sheet assemblies can be spliced on site, the tunnel construction process is divided into a plurality of chambers, multiple times of excavation are carried out, the excavation area is small each time, and the stability of the tunnel in the construction process can be improved.
4. Because interim stull with interim erects to prop and all adopt a plurality of supporting shoes concatenation to form, convenient transportation and field installation work as after the installation of arc section of pipe piece subassembly, the field is assembled interim stull with interim stull forms interim invert and interim partition wall, forms interim the strut to the grotto of digging, after annular arc section of pipe piece subassembly is installed, forms the annular of accomplishing and supports.
5. Because the connecting ribs are arranged, the connecting ribs stretch across the connecting seams of the two adjacent arc-shaped pipe sheet assemblies, and the reinforcing materials are used for reinforcing, the bearing capacity of the joint of the two arc-shaped pipe sheet assemblies is greatly enhanced.
Drawings
Fig. 1 is a schematic perspective view illustrating a tunnel supporting structure according to the present invention;
fig. 2 is a formal view showing a tunnel supporting structure according to the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 1 according to the present invention;
FIG. 4 is a perspective view of an arcuate tube sheet assembly according to the present invention;
FIG. 5 is a schematic view of the connection of two adjacent arcuate tube sheet assemblies of the present invention;
fig. 6 is a schematic view showing an arrangement of reinforcing bars on an arc tube sheet assembly according to the present invention.
Description of the element reference
1. An arc tube sheet assembly; 11. a resilient support layer; 12. a second support layer; 13. a first support layer; 101. an arc-shaped inner plate; 102. an arc-shaped middle plate; 103. an arc-shaped outer plate; 104. an elastic member; 105. reinforcing ribs; 106. connecting ribs; 107. a corrugated steel plate; 108. an anchor rod hole; 2. locking the anchor rod; 3. a temporary wale; 4. temporary vertical bracing; 5. the tunnel rock mass.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1 to 6. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so that the present disclosure is not limited to the technical essence, and any modifications of the structures, changes of the ratios, or adjustments of the sizes, can still fall within the scope of the present disclosure without affecting the function and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are used for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms may be changed or adjusted without substantial change in the technical content.
The following examples are for illustrative purposes only. The various embodiments may be combined, and are not limited to what is presented in the following single embodiment.
Referring to fig. 1 and 6, the present invention provides a tunnel supporting structure, which includes: the device comprises an arc-shaped pipe sheet assembly 1, a reinforcing material and a foot locking anchor rod 2; the arc-shaped pipe sheet assembly 1 comprises an arc-shaped inner plate 101, an arc-shaped middle plate 102 and an arc-shaped outer plate 103, the arc-shaped inner plate 101, the arc-shaped middle plate 102 and the arc-shaped outer plate 103 can be made of steel, the arc-shaped inner plate 101 and the arc-shaped middle plate 102 are fixedly connected through a reinforcing rib 105, the reinforcing rib 105 and the arc-shaped inner plate 101, the reinforcing rib 105 and the arc-shaped middle plate 102 can be welded or connected through high-strength bolts, and the arc-shaped middle plate 102 and the arc-shaped outer plate 103 are connected in a floating mode through elastic pieces.
The arc-shaped pipe sheet assemblies 1 are annularly spliced, wherein adjacent arc-shaped inner plates 101 are fixedly connected and can be welded, bolted or connected in a tenon-and-mortise structure, adjacent arc-shaped middle plates 102 are fixedly connected and can be welded, bolted or connected in a tenon-and-mortise structure, mounting holes can be formed in the arc-shaped inner plates 101, a mounting tool can extend into the space between the arc-shaped inner plates 101 and the arc-shaped middle plates 102 and is convenient to mount, the adjacent arc-shaped outer plates 103 are movably connected, the arc-shaped inner plates 101 are spliced to form first supporting layers 13, the arc-shaped middle plates 102 are spliced to form second supporting layers 12, the arc-shaped outer plates 103 are spliced to form elastic supporting layers 11, the elastic supporting layers 11 are tightly attached to the tunnel rock mass 5, the first supporting layers 13 and the second supporting layers 12 enclose an annular grouting space, reinforcing material grouting holes are formed in the arc-shaped inner plates 101, and the reinforcing materials are filled in the annular grouting space; the reinforcing material may be concrete, anchor rod holes 108 are formed in the arc inner plate 101, the arc middle plate 102 and the arc outer plate 103, the foot-locking anchor rod 108 penetrates through the anchor rod holes 108 in the arc inner plate 101, the arc middle plate 102 and the arc outer plate 103, and the arc pipe sheet assembly 1 and the tunnel rock mass 5 are fixedly connected through the foot-locking anchor rod 2.
Because arc pipe sheet subassembly 1 can be spliced on the spot, tunnel construction process divides many caverns, excavates many times, and excavation area is little at every turn, can improve the stability in tunnel in the work progress, through arc pipe sheet subassembly 1 concatenation forms first supporting layer 13 second supporting layer 12 and elastic support layer 11, three supporting layer form the supporting role to the tunnel, and arc pipe sheet subassembly 1 adopts preparation in advance, and on-the-spot concatenation is spliced, simple to operate, uses manpower sparingly, efficient, works as after the good concatenation of arc pipe sheet subassembly 1, first supporting layer 13 with pour into reinforced material into between the second supporting layer 12, whole loop configuration forms a whole, and bearing capacity is strong. Through elastic supporting layer 11 can release country rock deformation pressure, reduces supporting construction's structural internal force to guarantee supporting construction's stability, thereby avoided the accumulation of country rock pressure to arouse supporting to produce brittle failure, guarantee construction operation personnel's safety.
In this embodiment, referring to fig. 4 and 5, the elastic member 104 includes a plurality of arc-shaped elastic steel plates, the arc-shaped elastic steel plates may be semicircular or wavy, one end of the arc-shaped elastic steel plate along the bending direction is fixedly connected to the arc-shaped outer plate 103, the other end of the arc-shaped elastic steel plate along the bending direction is fixedly connected to the arc-shaped middle plate 102, and when the tunnel rock 5 deforms, the arc-shaped elastic steel plates have an energy absorbing function and can play a role in stabilizing pressure.
In this embodiment, referring to fig. 6, the reinforcing ribs 105 are disposed along the bending direction of the inner arc plate 101, and a plurality of the reinforcing ribs 105 are arranged in parallel, so as to enhance the bearing capacity of the inner arc plate 101 and the middle arc plate 102.
In this embodiment, referring to fig. 1 and fig. 2, an elastic grouting material, such as a polyurethane grouting material, is filled between the second supporting layer 12 and the elastic supporting layer 11, a grouting pipe is disposed on the arc-shaped pipe sheet assembly 1, and the elastic grouting material is injected between the second supporting layer 12 and the elastic supporting layer 11 through the grouting pipe, so as to enhance the bearing capacity and the energy-absorbing and pressure-stabilizing capacity of the elastic supporting layer 11.
In this embodiment, referring to fig. 1 and fig. 3, the arc-shaped pipe sheet assembly 1 further includes a corrugated steel plate 107, the corrugated steel plate 107 is fixedly connected to the arc-shaped outer plate 103, the corrugated steel plates 107 are disposed at two ends of the arc-shaped outer plate 103, the corrugated steel plates 107 on two adjacent arc-shaped pipe sheet assemblies 1 are in contact with each other, when the arc-shaped outer plate 103 is deformed by pressure, the corrugated steel plates 107 provide an annular supporting force, and the corrugated steel plates 107 can absorb energy and transmit load to the adjacent arc-shaped pipe sheet assemblies 1.
In this embodiment, referring to fig. 1 to fig. 5, the arc tube sheet assembly 1 further includes a connection rib 106, the connection rib 106 is fixedly disposed at one end of the arc tube sheet assembly 1, the arc tube sheet assembly 1 is fixedly mounted between the arc inner plate 101 and the arc middle plate 102, a portion of the connection rib 106 extends out of the arc inner plate 101 and the arc middle plate 102, and the connection rib 106 extends into a position between the arc middle plate 102 and the arc inner plate 101 of the adjacent arc tube sheet assembly 1. Due to the arrangement of the connecting ribs 103, the connecting ribs 106 span the connecting seams of the two adjacent arc-shaped pipe sheet assemblies 1, and the reinforcing material is used for reinforcing, so that the whole annular support forms a whole, the bearing capacity of the joint of the two arc-shaped pipe sheet assemblies is enhanced, and the whole bearing capacity is enhanced.
In this embodiment, referring to fig. 1, in the length direction of the tunnel, two adjacent arc-shaped pipe sheet assemblies 1 are spliced by staggered joints, that is, the splicing joints of the arc-shaped pipe sheet assemblies 1 in the length direction of the tunnel are not on the same straight line, so that the bearing capacity of the tunnel is enhanced.
In this embodiment, referring to fig. 1 and 2, the tunnel supporting structure further includes a temporary cross brace 3 and a temporary vertical brace 4, in the construction process, the temporary cross brace 3 and the temporary vertical brace 4 cooperate to form a temporary support for the arc-shaped pipe sheet assembly 1, the temporary cross brace 3 forms a temporary inverted arch, and the temporary vertical brace 4 forms a temporary partition wall.
In this embodiment, please refer to fig. 1 and 2, each of the temporary cross braces 3 and the temporary vertical braces 4 includes a support block and a connection block, the adjacent support blocks are connected by a mortise-tenon joint structure, the connection block spans a connection seam between the two adjacent support blocks and is respectively and fixedly connected with the two support blocks, when only one temporary vertical brace 4 exists in the excavation space, the support block at one end of the temporary cross brace 3 is fixedly connected with the arc-shaped pipe sheet assembly 1, the other end of the temporary cross brace 3 is fixedly connected with the support block at the end of the temporary vertical brace 4, when two zero vertical braces 4 exist in the excavation space, two ends of the temporary cross brace 3 are respectively and fixedly connected with the end support blocks of the two zero vertical braces 4, the support block at one end of the temporary vertical brace 4 is fixedly connected with the arc-shaped pipe sheet assembly 1, and the other end of the temporary vertical brace 4 is fixedly connected with the support block at the end of the temporary cross brace 3.
Because interim stull 3 with interim erector 4 adopts a plurality of supporting shoes concatenations to form, convenient transportation and field installation work as after arc section of pipe piece subassembly 1 has been installed, the on-the-spot is assembled interim stull 3 with interim stull 4 forms interim invert and interim partition wall, forms interim the strut to the grotto of digging, after annular arc section of pipe piece subassembly 1 has been installed, forms the annular of accomplishing and supports.
A construction method of a tunnel support comprises the following steps:
a region dividing step: measuring and lofting, and planning a tunnel section into an upper area and a lower area, wherein the upper area and the lower area respectively comprise at least one chamber along the horizontal direction;
pre-curing: arranging a small advanced guide pipe at the arch top of the tunnel and grouting for reinforcement;
excavating: excavating from the cavern at one side of the upper region of the tunnel, and after the excavation of all caverns in the upper region is finished, excavating sequentially from one side of the lower region;
a support step: after a chamber is dug, the arc-shaped pipe sheet assembly 1 is installed along a tunnel rock body 5, the arc-shaped outer plate 103 is in contact with the tunnel rock body, a foot locking anchor rod 2 is arranged on the arc-shaped pipe sheet assembly 1, and a temporary cross brace 3 and a temporary vertical brace 4 are installed, so that the arc-shaped pipe sheet assembly 1, the temporary cross brace 3 and the temporary vertical brace 4 form a complete closed loop, and after the support is completed, the next chamber is dug;
grouting: after the excavation of all the caverns is finished, splicing the arc-shaped pipe sheet assemblies 1 into a complete ring, and injecting a reinforcing material between the first supporting layer 13 and the second supporting layer 12; and removing all the temporary cross braces 3 and the temporary vertical braces 4 after the reinforcing material is solidified.
Because the tunnel construction process is divided into a plurality of chambers to excavate for a plurality of times, the excavation area is small each time, and the stability of the tunnel in the construction process can be improved.
In conclusion, through the formation of splicing of arc pipe sheet subassembly 1 first supporting layer 13 second supporting layer 12 and elastic support layer 11, three supporting layer form the supporting effect to the tunnel, and arc pipe sheet subassembly 1 adopts preparation in advance, and on-the-spot concatenation is convenient to install, uses manpower sparingly, and is efficient, works as after the good back of splicing of arc pipe sheet subassembly 1 first supporting layer 13 with pour into reinforced material into between the second supporting layer 12, whole ring structure forms a whole, and bearing capacity is strong, elastic support layer 11 can release country rock deformation pressure, reduces supporting structure's structure internal force to guarantee supporting structure's stability, can also avoid supporting structure's damage, guarantee construction operation personnel's safety. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. A tunnel supporting structure, comprising:
an arc-shaped pipe sheet component is arranged on the upper surface of the pipe sheet component,
a plurality of arc-shaped pipe sheet assemblies are annularly spliced; the arc-shaped pipe sheet assembly comprises an arc-shaped inner plate, an arc-shaped middle plate and an arc-shaped outer plate, the arc-shaped inner plate and the arc-shaped middle plate are fixedly connected through a reinforcing rib, and the arc-shaped middle plate and the arc-shaped outer plate are in floating connection through an elastic part; the adjacent arc-shaped inner plates are fixedly connected, the adjacent arc-shaped middle plates are fixedly connected, the adjacent arc-shaped outer plates are movably connected, the arc-shaped inner plates are spliced to form a first supporting layer, the arc-shaped middle plates are spliced to form a second supporting layer, the arc-shaped outer plates are spliced to form an elastic supporting layer, the elastic supporting layer is tightly attached to a tunnel rock mass, and the first supporting layer and the second supporting layer enclose an annular grouting space;
the reinforcing material is a material that is reinforced,
the annular grouting space is filled with the reinforcing material;
locking the anchor rod;
the arc-shaped inner plate, the arc-shaped middle plate and the arc-shaped outer plate are all provided with anchor rod holes, the foot-locking anchor rod sequentially penetrates through the anchor rod holes in the arc-shaped inner plate, the arc-shaped middle plate and the arc-shaped outer plate, and the arc-shaped pipe sheet assembly and the tunnel rock body are fixedly connected through the foot-locking anchor rod;
the elastic part comprises a plurality of arc-shaped elastic steel plates, one end of each arc-shaped elastic steel plate along the bending direction is fixedly connected with the arc-shaped outer plate, and the other end of each arc-shaped elastic steel plate along the bending direction is fixedly connected with the arc-shaped middle plate;
the arc-shaped pipe sheet assembly further comprises corrugated steel plates, the corrugated steel plates are fixedly connected with the arc-shaped outer plate, the corrugated steel plates are arranged at two ends of the arc-shaped outer plate, and the corrugated steel plates on the adjacent arc-shaped pipe sheet assembly are mutually contacted.
2. The tunnel support structure of claim 1, wherein: the strengthening rib is followed the crooked direction setting of arc inner panel, a plurality of the strengthening rib parallel arrangement.
3. The tunnel support structure of claim 1, wherein: and an elastic grouting material is filled between the second supporting layer and the elastic supporting layer.
4. The tunnel support structure of claim 1, wherein: a connecting rib is arranged between two adjacent arc pipe sheet assemblies, one end of the connecting rib is fixedly connected with the arc inner plate or/and the arc middle plate of one of the arc pipe sheet assemblies, and the other end of the connecting rib extends into the arc middle plate of the other arc pipe sheet assembly and the space between the arc inner plates.
5. The tunnel support structure of claim 1, wherein: in the length direction of the tunnel, two adjacent arc-shaped pipe sheet assemblies are spliced by adopting staggered joints.
6. The tunnel support structure of claim 1, wherein: the tunnel supporting structure further comprises a temporary cross brace and a temporary vertical brace, wherein in the construction process, the temporary cross brace and the temporary vertical brace are matched with the arc-shaped pipe sheet assembly to form a temporary support, the temporary cross brace forms a temporary inverted arch, the temporary vertical brace forms a temporary partition wall, and the temporary cross brace, the temporary vertical brace and the arc-shaped pipe sheet assembly are enclosed to form a tunneling space.
7. The tunnel support structure of claim 6, wherein: the temporary transverse support and the temporary vertical support comprise supporting blocks and connecting blocks, adjacent supporting blocks are connected through a mortise and tenon joint structure, and the connecting blocks stretch across the connecting joints of the two adjacent supporting blocks and are fixedly connected with the two supporting blocks respectively.
8. A construction method of a tunnel support is characterized in that: the tunnel support structure adapted for use in claim 6, comprising the steps of:
a region dividing step: measuring and lofting, and planning a tunnel section into an upper area and a lower area, wherein the upper area and the lower area respectively comprise at least one chamber in the horizontal direction;
pre-curing: arranging a small advanced guide pipe at the arch top of the tunnel and grouting for reinforcement;
excavating: excavating from the cavern at one side of the upper region of the tunnel, and after the excavation of all caverns in the upper region is finished, excavating sequentially from one side of the lower region;
a support step: after a chamber is dug, the arc-shaped pipe sheet assembly is installed along a tunnel rock mass, the arc-shaped outer plate is in contact with the tunnel rock mass, a locking anchor rod is arranged on the arc-shaped pipe sheet assembly, and a temporary cross brace and a temporary vertical brace are installed, so that the arc-shaped pipe sheet assembly, the temporary cross brace and the temporary vertical brace form a complete closed-loop support, and after the support is completed, the next chamber is dug;
grouting: after the excavation of all the caverns is finished, the arc-shaped pipe sheet assemblies are spliced into a complete circular ring support, and a reinforcing material is injected between the first support layer and the second support layer; and removing all the temporary cross braces and the temporary vertical braces after the reinforcing material is solidified.
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| JPH10259697A (en) * | 1997-03-17 | 1998-09-29 | Daiho Constr Co Ltd | Concrete board piece, tunnel lining body, and manufacture of concrete board piece |
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