CN111852504A - Support structure for mountainside tunnel and construction method thereof - Google Patents
Support structure for mountainside tunnel and construction method thereof Download PDFInfo
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- CN111852504A CN111852504A CN202010677853.4A CN202010677853A CN111852504A CN 111852504 A CN111852504 A CN 111852504A CN 202010677853 A CN202010677853 A CN 202010677853A CN 111852504 A CN111852504 A CN 111852504A
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- 238000010276 construction Methods 0.000 title claims abstract description 33
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 90
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 239000004567 concrete Substances 0.000 claims description 24
- 238000009412 basement excavation Methods 0.000 claims description 18
- 239000004927 clay Substances 0.000 claims description 17
- 239000011435 rock Substances 0.000 claims description 17
- 239000002689 soil Substances 0.000 claims description 17
- 230000003014 reinforcing effect Effects 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 230000002787 reinforcement Effects 0.000 claims description 5
- 230000001012 protector Effects 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims 2
- 238000000034 method Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 206010066054 Dysmorphism Diseases 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 238000004078 waterproofing 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
- E21D11/003—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 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
-
- 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a mountainside tunnel supporting structure and a construction method thereof, wherein the mountainside tunnel supporting structure comprises: the bias support comprises a bias retaining wall foundation, a reinforced concrete retaining wall arranged at the top of the bias retaining wall foundation and a reinforced concrete special-shaped retaining arch connected with the reinforced concrete retaining wall; the upper arch springing of the reinforced concrete special-shaped retaining arch is embedded and reinforced in a mountain body, and the lower arch springing of the reinforced concrete special-shaped retaining arch is matched with the reinforced concrete retaining wall; the tunnel supporting body comprises a primary support arranged in the peripheral direction of the tunnel and a secondary lining arranged on the outer side of the primary support, and the secondary lining is connected with the arc inner side surface of the reinforced concrete special-shaped retaining arch. The application discloses a support structure of a mountainside tunnel and a construction method of the support structure, and aims to solve the construction problem of a mountainside cliff section.
Description
Technical Field
The invention relates to the field of tunnel construction, in particular to a mountainside tunnel supporting structure and a construction method thereof.
Background
China is a country with many mountains, and can not avoid cliff sections when tunnels are built in mountainous areas. In such a section, the problems of tunnel mouth bias and slope disposal are often encountered. Aiming at the construction of the bias tunnel portal, rich theoretical and practical experiences are accumulated in the design and construction. In particular, in recent years, a bias tunnel has been widely used for the construction of mountain tunnels.
For large bias holes, the railway industry mainly adopts a design construction scheme of large excavation. The large excavation scheme is to excavate a large area into the hole. The construction process of the scheme is complicated, the original environment is easy to damage, the tunnel entrance time is influenced by large engineering quantity in the tunnel entrance construction, and the engineering investment cost is high. The highway industry mainly pursues the conventional semi-bright and semi-dark composite double-layer tunnel structure. However, the conventional semi-bright and semi-dark tunnel structure cannot adapt to the tunnel portal of the high and steep slope, and the linear parameters of the flat longitudinal surface can only be sacrificed in the design to avoid the occurrence of the high and steep slope tunnel. In addition, the tunnel structure of above-mentioned two kinds of schemes also can't form a system with the country rock, realizes the whole atress of tunnel structure and country rock. Therefore, the two schemes have great limitations and cannot be applied to tunnel construction of the mountainside cliff section.
In view of the above problems, the present invention provides a support structure for a mountainside tunnel and a construction method thereof to solve or at least alleviate the above drawbacks.
Disclosure of Invention
The invention mainly aims to provide a support structure of a mountainside tunnel and a construction method thereof, and aims to solve the construction problem of a mountainside cliff section.
In order to achieve the above object, the present invention provides a support structure for a mountainside tunnel, comprising:
the bias support comprises a bias retaining wall foundation, a reinforced concrete retaining wall arranged at the top of the bias retaining wall foundation and a reinforced concrete special-shaped retaining arch connected with the reinforced concrete retaining wall; the upper arch springing of the reinforced concrete special-shaped retaining arch is embedded and reinforced in a mountain body, and the lower arch springing of the reinforced concrete special-shaped retaining arch is matched with the reinforced concrete retaining wall;
the tunnel supporting body comprises a primary support arranged in the peripheral direction of the tunnel and a secondary lining arranged on the outer side of the primary support, and the secondary lining is connected with the arc inner side surface of the reinforced concrete special-shaped retaining arch.
Preferably, the mountaineering tunnel supporting structure further comprises a tunnel top concrete layer arranged above the reinforced concrete special-shaped retaining arch, a waterproof layer arranged above the tunnel top concrete layer, and a clay waterproof layer laid above the waterproof layer.
Preferably, the reinforced concrete retaining wall is provided with a drain hole, and the drain hole and the waterproof layer are located at the same height.
Preferably, one end of the water drainage hole is communicated with the waterproof layer, and the other end of the water drainage hole is communicated with the outside.
Preferably, the primary support and the secondary lining are both independently looped.
Preferably, the foundation of the offset retaining wall is provided with an anchor rod inserted into a mountain.
In addition, the present invention provides a construction method of the above-described mountainside tunnel supporting structure, the construction method including the steps of:
reinforcing the slope body at the upper part of the tunnel, and constructing a reinforced concrete enlarged foundation on the ground to form the bias retaining wall foundation;
excavating at the position of an upper arch springing embedded with the reinforced concrete special-shaped retaining arch at the upward slope, removing loose soil during excavation, and reinforcing the excavated position; the reinforcement treatment mode comprises one or more of concrete spraying, grouting through a grouting guide pipe or setting of a reinforcing mesh;
according to the size and the terrain of a slope body and the central line and the side line of the tunnel, the reinforced concrete retaining wall and the reinforced concrete special-shaped arch protector matched with the slope body are molded, and concrete at the bottom of the tunnel inverted arch is backfilled;
reinforcing the joint of the upper arch springing and the upward slope of the reinforced concrete special-shaped retaining arch to enable the reinforced concrete retaining wall, the reinforced concrete special-shaped retaining arch and the surrounding rock of the upward slope to form a whole;
arranging advanced supports for the tunnel, wherein the advanced supports are erected around the tunnel to be excavated to prepare for a subsequent excavation soil body;
And excavating the soil body in the tunnel, wherein the excavation mode comprises mechanical excavation or presplitting blasting, the circular footage is less than one meter during excavation, and the distance between the circular footage and the support is less than half a meter.
Constructing the primary support and the temporary section steel in a hole, and molding and injecting the secondary lining;
and backfilling the top of the hole.
Preferably, the step of hole top backfilling comprises:
backfilling concrete above the reinforced concrete special-shaped retaining arch to form a concrete layer on the top of the tunnel;
arranging a waterproof layer above the concrete layer on the top of the tunnel;
paving clay on the waterproof layer to form the clay waterproof layer;
and paving planting soil on the clay water-resisting layer for greening treatment.
Preferably, the construction method further comprises:
the reinforced concrete retaining wall is provided with the water drainage hole, and the water drainage hole and the waterproof layer are located at the same height.
Preferably, the biased retaining wall foundation is reinforced by inserting anchor rods into bedrock of the mountain.
In the scheme of this application, provided a supporting construction suitable for hillside cliff tunnel. The tunnel of this supporting construction faces the sky side and is provided with the bias voltage supporter, and the bias voltage supporter is formed by bias voltage barricade basis, set up in the reinforced concrete barricade at bias voltage barricade basis top and the reinforced concrete dysmorphism fender arch concatenation of being connected with the reinforced concrete barricade. The upper arch foot of the reinforced concrete special-shaped retaining arch is embedded into the mountain body, and the mountain body at the embedded section is reinforced, so that the reinforced concrete retaining wall, the reinforced concrete special-shaped structure and the surrounding rock form a whole, and the stress is more reliable. The tunnel support body comprises a primary support arranged in the peripheral direction of the tunnel and a secondary lining arranged on the outer side of the primary support, the secondary lining and the reinforced concrete special-shaped arch support form a three-layer support structure, not only can resist bias voltage, but also can form a system with surrounding rocks, and the integral stress of the tunnel structure and the surrounding rocks is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural view of a supporting structure of a mountainside tunnel according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating construction steps of a support structure for a mountainside tunnel according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
The reference numbers illustrate:
110-bias retaining wall foundation, 120-reinforced concrete retaining wall and 130-reinforced concrete special-shaped retaining arch;
131-upper arch springing and 132-lower arch springing;
200-primary support and 300-secondary lining;
410-a tunnel top concrete layer, 420-a waterproof layer, 430-a clay waterproof layer and 440-a planting soil layer.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a supporting structure for a mountainside tunnel, including:
the bias support comprises a bias retaining wall foundation 110, a reinforced concrete retaining wall 120 arranged at the top of the bias retaining wall foundation 110 and a reinforced concrete special-shaped retaining arch 130 connected with the reinforced concrete retaining wall 120; the upper arch springing 131 of the reinforced concrete special-shaped retaining arch 130 is embedded and reinforced in the mountain, the lower arch springing 132 of the reinforced concrete special-shaped retaining arch 130 is matched with the reinforced concrete retaining wall 120;
the tunnel supporting body comprises a primary support 200 arranged in the peripheral direction of the tunnel and a secondary lining 300 arranged on the outer side of the primary support 200, wherein the secondary lining 300 is connected with the arc inner side surface of the reinforced concrete special-shaped retaining arch 130.
Wherein, the offset retaining wall foundation 110 is provided with an anchor rod inserted into the mountain. To ensure that the offset wall footing 110 does not sink, the offset wall footing 110 should be placed on the rock base. The offset retaining wall foundation 110 is reinforced by inserting anchor rods into bedrock of the mountain so as to have sufficient supporting rigidity. The anchor is preferably
Hollow grouting anchor rodGrouting anchor rods are arranged at the joint of the substrate and the rock surface, the distance between the anchor rods is 50-60cm, and the length of an insertion end is 40-60 cm.
In the scheme of this application, provided a supporting construction suitable for hillside cliff tunnel. The tunnel of the supporting structure is provided with a bias support body on the side near empty, and the bias support body is formed by splicing a bias retaining wall foundation 110, a reinforced concrete retaining wall 120 arranged at the top of the bias retaining wall foundation 110 and a reinforced concrete special-shaped retaining arch 130 connected with the reinforced concrete retaining wall 120. The upper arch foot 131 of the reinforced concrete special-shaped retaining arch is embedded into the mountain body, and the mountain body at the embedded section is reinforced, so that the reinforced concrete retaining wall, the reinforced concrete special-shaped structure and the surrounding rock form a whole, and the stress is more reliable. The tunnel support body comprises a primary support 200 arranged in the peripheral direction of the tunnel and a secondary lining 300 arranged on the outer side of the primary support 200, the secondary lining 300 and the reinforced concrete special-shaped arch support 130 form a three-layer support structure, not only can resist bias voltage, but also can form a system with surrounding rocks, and the integral stress of the tunnel structure and the surrounding rocks is realized.
As a specific embodiment of the present invention, the mountainous side tunnel supporting structure further includes a tunnel top concrete layer 410 disposed above the reinforced concrete special-shaped arch guard 130, a waterproof layer 420 disposed above the tunnel top concrete layer 410, and a clay water-proof layer 430 laid above the waterproof layer 420. Planting soil can be laid above the clay waterproof layer 430 for greening. Most rainwater is filtered after passing through planting soil and clay water-resisting layer 430, and a small part of water stains are blocked at waterproof layer 420. Further, the reinforced concrete retaining wall 120 is provided with a drain hole, and the drain hole and the waterproof layer 420 are located at the same height, so that water stains on the waterproof layer 420 can be discharged from the drain hole. Preferably, one end of the drainage hole is communicated with the waterproof layer 420, and the other end of the drainage hole is communicated with the outside. The other end of the water drain hole is located on the side of the reinforced concrete retaining wall 120 away from the reinforced concrete special-shaped arch guard 130, and the height of the end can be smaller than or equal to that of the end communicated with the waterproof layer 420, so that accumulated water can be drained conveniently.
As the preferred embodiment of the invention, the primary support 200 and the secondary lining 300 are both independent ring-shaped structures after the construction is completed, and the ring-shaped structures are stressed more stably. The primary support 200 may be constructed in the sequence from the top, and the secondary lining 300 may be constructed in the sequence from the bottom to the top. Namely, the secondary lining 300 is constructed into an inverted arch and then an arch wall is manufactured.
In addition, referring to fig. 1 and fig. 2, the present invention further provides a construction method of the above-mentioned support structure for the mountainside tunnel, the construction method comprising the steps of:
s10, reinforcing the slope body at the upper part of the tunnel, and constructing a reinforced concrete enlarged foundation on the ground to form a bias retaining wall foundation 110;
to ensure that the offset wall foundations 110 do not sink, the offset wall foundations 110 should be set on the bedrock, and in addition, the offset wall foundations 110 are reinforced by inserting anchor rods into the bedrock of the mountain, so as to have sufficient supporting rigidity. The anchor is preferably
The hollow grouting anchor rod is arranged at the joint of the substrate and the rock surface, the distance between the anchor rods is 50-60cm, and the length of the insertion end is 40-60 cm.
S20, excavating at the position of an upper arch springing 131 of the upward slope for embedding the reinforced concrete special-shaped arch guard 130, removing loose soil during excavating, and reinforcing the excavated position; the reinforcement treatment mode comprises one or more of concrete spraying, grouting through a grouting guide pipe or setting of a reinforcing mesh;
Wherein, the excavation face should be well controlled during excavation to reduce the disturbance to the former massif, can in time adopt slip casting pipe to carry out domatic reinforcement after the excavation. Reinforcing mesh and C20 concrete spraying can be arranged for reinforcement and protection; the angle of the upward arch slope is preferably larger than 90 degrees, and the specific angle is determined according to the actual terrain condition. The slope surface supporting mode of the upward slope can adopt a mortar anchor rod and can also adopt a grouting guide pipe.
S30, according to the size and the terrain of the slope, the central line and the side line of the tunnel, the reinforced concrete retaining wall 120 and the reinforced concrete special-shaped arc protector 130 matched with the slope are molded, and the concrete at the bottom of the tunnel inverted arch is backfilled;
s40, reinforcing the joint of the upper arch springing 131 and the upward slope of the reinforced concrete special-shaped retaining arch 130, so that the reinforced concrete retaining wall 120, the reinforced concrete special-shaped retaining arch 130 and the surrounding rock of the upward slope form a whole;
s50, arranging advance supports for the tunnel, wherein the advance supports are erected around the tunnel to be excavated to prepare for a soil body to be excavated subsequently;
and S60, excavating the soil body in the tunnel, wherein the excavation mode comprises mechanical excavation or presplitting blasting, the circular footage is less than one meter during excavation, and the distance between the circular footage and the support is less than half a meter.
S70, constructing a primary support 200 and temporary section steel in the hole, and molding and injecting a secondary lining 300;
And S80, backfilling the top of the hole.
In the scheme of this application, provided a supporting construction suitable for hillside cliff tunnel. The tunnel of the supporting structure is provided with a bias support body on the side near empty, and the bias support body is formed by splicing a bias retaining wall foundation 110, a reinforced concrete retaining wall 120 arranged at the top of the bias retaining wall foundation 110 and a reinforced concrete special-shaped retaining arch 130 connected with the reinforced concrete retaining wall 120. The upper arch foot 131 of the reinforced concrete special-shaped retaining arch is embedded into the mountain body, and the mountain body at the embedded section is reinforced, so that the reinforced concrete retaining wall, the reinforced concrete special-shaped structure and the surrounding rock form a whole, and the stress is more reliable. The tunnel support body comprises a primary support 200 arranged in the peripheral direction of the tunnel and a secondary lining 300 arranged on the outer side of the primary support 200, the secondary lining 300 and the reinforced concrete special-shaped arch support 130 form a three-layer support structure, not only can resist bias voltage, but also can form a system with surrounding rocks, and the integral stress of the tunnel structure and the surrounding rocks is realized.
The method specifically comprises the following steps of hole top backfilling:
backfilling concrete above the reinforced concrete special-shaped arch protection 130 to form a tunnel top concrete layer 410;
a waterproof layer 420 is arranged above the tunnel top concrete layer 410;
Paving clay on the waterproof layer 420 to form a clay waterproof layer 430;
planting soil is laid on the clay waterproof layer 430 for greening.
In this embodiment, greening, waterproofing and reinforcing treatment is performed by sequentially arranging a tunnel top concrete layer 410, a waterproof layer 420, a clay water-resisting layer 430 and a planting soil layer 440 above the reinforced concrete special-shaped arch protector 130. Most rainwater is filtered after passing through planting soil and clay water-resisting layer 430, and a small part of water stains are blocked at waterproof layer 420.
Further, the construction method further comprises the following steps: the reinforced concrete retaining wall 120 is provided with a drain hole, and the drain hole and the waterproof layer 420 are located at the same height. In this embodiment, the reinforced concrete retaining wall 120 is provided with a drainage hole, and the drainage hole and the waterproof layer 420 are located at the same height, so that water stains on the waterproof layer 420 can be discharged from the drainage hole. Preferably, one end of the drainage hole is communicated with the waterproof layer 420, and the other end of the drainage hole is communicated with the outside. The other end of the water drain hole is located on the side of the reinforced concrete retaining wall 120 away from the reinforced concrete special-shaped arch guard 130, and the height of the end can be smaller than or equal to that of the end communicated with the waterproof layer 420, so that accumulated water can be drained conveniently. The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A support structure for a mountainside tunnel, comprising:
the bias support comprises a bias retaining wall foundation, a reinforced concrete retaining wall arranged at the top of the bias retaining wall foundation and a reinforced concrete special-shaped retaining arch connected with the reinforced concrete retaining wall; the upper arch springing of the reinforced concrete special-shaped retaining arch is embedded and reinforced in a mountain body, and the lower arch springing of the reinforced concrete special-shaped retaining arch is matched with the reinforced concrete retaining wall;
the tunnel supporting body comprises a primary support arranged in the peripheral direction of the tunnel and a secondary lining arranged on the outer side of the primary support, and the secondary lining is connected with the arc inner side surface of the reinforced concrete special-shaped retaining arch.
2. The mountaineering tunnel supporting structure according to claim 1, further comprising a tunnel top concrete layer provided above the reinforced concrete special-shaped retaining arch, a waterproof layer provided above the tunnel top concrete layer, and a clay water-resisting layer laid above the waterproof layer.
3. The support structure of claim 2, wherein the reinforced concrete retaining wall is provided with a drainage hole, and the drainage hole and the waterproof layer are located at the same height.
4. The support structure for the mountainside tunnel according to claim 3, wherein one end of the drain hole is in communication with the waterproof layer, and the other end of the drain hole is in communication with the outside.
5. The support structure of claim 1, wherein the primary support and the secondary lining are each independently looped.
6. The support structure for the mountainside tunnel according to claim 1, wherein an anchor rod inserted into a mountain is provided on the foundation of the offset retaining wall.
7. A construction method for constructing the support structure of the mountainside tunnel according to any one of claims 1 to 6, characterized by comprising the steps of:
reinforcing the slope body at the upper part of the tunnel, and constructing a reinforced concrete enlarged foundation on the ground to form the bias retaining wall foundation;
excavating at the position of an upper arch springing embedded with the reinforced concrete special-shaped retaining arch at the upward slope, removing loose soil during excavation, and reinforcing the excavated position; the reinforcement treatment mode comprises one or more of concrete spraying, grouting through a grouting guide pipe or setting of a reinforcing mesh;
according to the size and the terrain of a slope body and the central line and the side line of the tunnel, the reinforced concrete retaining wall and the reinforced concrete special-shaped arch protector matched with the slope body are molded, and concrete at the bottom of the tunnel inverted arch is backfilled;
Reinforcing the joint of the upper arch springing and the upward slope of the reinforced concrete special-shaped retaining arch to enable the reinforced concrete retaining wall, the reinforced concrete special-shaped retaining arch and the surrounding rock of the upward slope to form a whole;
arranging advanced supports for the tunnel, wherein the advanced supports are erected around the tunnel to be excavated to prepare for a subsequent excavation soil body;
and excavating the soil body in the tunnel, wherein the excavation mode comprises mechanical excavation or presplitting blasting, the circular footage is less than one meter during excavation, and the distance between the circular footage and the support is less than half a meter.
Constructing the primary support and the temporary section steel in a hole, and molding and injecting the secondary lining;
and backfilling the top of the hole.
8. The construction method according to claim 7, wherein the step of backfilling the top of the hole specifically comprises:
backfilling concrete above the reinforced concrete special-shaped retaining arch to form a concrete layer on the top of the tunnel;
arranging a waterproof layer above the concrete layer on the top of the tunnel;
paving clay on the waterproof layer to form the clay waterproof layer;
and paving planting soil on the clay water-resisting layer for greening treatment.
9. The construction method according to claim 7, further comprising:
the reinforced concrete retaining wall is provided with the water drainage hole, and the water drainage hole and the waterproof layer are located at the same height.
10. The construction method according to claim 7, wherein the biased retaining wall foundation is reinforced by inserting anchor rods into bedrock of the mountain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010677853.4A CN111852504A (en) | 2020-07-15 | 2020-07-15 | Support structure for mountainside tunnel and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010677853.4A CN111852504A (en) | 2020-07-15 | 2020-07-15 | Support structure for mountainside tunnel and construction method thereof |
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| CN111852504A true CN111852504A (en) | 2020-10-30 |
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| CN202010677853.4A Pending CN111852504A (en) | 2020-07-15 | 2020-07-15 | Support structure for mountainside tunnel and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116717271A (en) * | 2023-05-09 | 2023-09-08 | 长江勘测规划设计研究有限责任公司 | Mountain-side integral type middle-wall multi-arch shed tunnel structure and construction method |
-
2020
- 2020-07-15 CN CN202010677853.4A patent/CN111852504A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116717271A (en) * | 2023-05-09 | 2023-09-08 | 长江勘测规划设计研究有限责任公司 | Mountain-side integral type middle-wall multi-arch shed tunnel structure and construction method |
| CN116717271B (en) * | 2023-05-09 | 2024-02-13 | 长江勘测规划设计研究有限责任公司 | Mountain-side integral type middle-wall multi-arch shed tunnel structure and construction method |
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