CN210530876U - Shallow bias voltage tunnel supporting construction that buries of offset type - Google Patents
Shallow bias voltage tunnel supporting construction that buries of offset type Download PDFInfo
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- CN210530876U CN210530876U CN201921611248.6U CN201921611248U CN210530876U CN 210530876 U CN210530876 U CN 210530876U CN 201921611248 U CN201921611248 U CN 201921611248U CN 210530876 U CN210530876 U CN 210530876U
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Abstract
The utility model discloses an offset shallow-buried bias tunnel supporting structure, which comprises a concrete arch and a retaining wall, wherein the concrete arch is arranged on the outer surface of a primary lining of a tunnel, the concrete arch is of an offset structure and is attached to the outer surface of the primary lining of a shallow-buried side, and a buffer gap is reserved between the concrete arch and the outer surface of the primary lining of a deep-buried side; and it is equipped with a protective layer to encircle the surface at the concrete cover, the utility model discloses can make the massif bury deeply that the side is applyed big load at first in proper order and act on a protective layer, the concrete cover encircles, the indirect effect of rethread buffering clearance is on the tunnel, can effectively reduce the tunnel and bury the load that the side received deeply, guarantee that the tunnel does not receive the bias voltage deformation, and through two-layer supporting, can further carry out good supporting to the tunnel, a structure is simple, easy construction, construction speed is fast, can bury the bias voltage tunnel shallowly and firmly strut, improve the security in tunnel excavation or the operation, reduce the maintenance dynamics and the financial resources input in tunnel later stage, and good economical and practical has.
Description
Technical Field
The utility model relates to a shallow bias voltage tunnel supporting construction that buries of offset formula belongs to tunnel supporting construction technical field.
Background
In the mountainous area province of China, the mountains are high and deep, the terrain and geological conditions are very complicated, and due to terrain limitation, the highway route selection is very difficult, so that a large number of shallow-buried bias tunnels are inevitably constructed. The shallow-buried bias tunnel has small buried depth and obviously asymmetric surrounding rock pressure, so that the mechanical characteristics of the structure are complicated, and the construction is very difficult. In the shallow-buried bias tunnel construction, accidents such as collapse, roof fall, large deformation of surrounding rocks and supporting structures, collapse of side and back slopes and the like occur occasionally, and some tunnels even cannot enter the tunnel. Meanwhile, the defects of lining cracking, water leakage, slope damage and the like occur shortly after the completion of the tunnel, so that severe social influence and huge economic loss are caused.
The protection in the existing bias tunnel portal construction is mainly as follows: the method for backfilling the counter-pressure soil balance part bias pressure or adding the anchor rods to carry out simple support outside the tunnel is adopted, the reinforcing effect is poor, the mountain body cannot be stabilized, the disturbance of the mountain body to the weak surrounding rock is reduced, the tunnel mouth section of the bias pressure tunnel is located in the range of the unstable landslide body, the construction stress and the bias pressure directly act on the tunnel, and the difficulty and the danger of the tunnel in excavation or operation are increased.
Disclosure of Invention
In view of this, the present invention provides an offset shallow tunnel supporting structure, which can overcome the defects of the prior art.
The utility model aims at realizing through the following technical scheme:
an offset type shallow-buried offset tunnel supporting structure comprises a concrete cover arch and a retaining wall, wherein the concrete cover arch is arranged on the outer surface of a primary lining of a tunnel, the retaining wall is arranged on the shallow-buried side of the tunnel, the concrete cover arch is of an offset type structure and is attached to the outer surface of the primary lining of the shallow-buried side, and a buffer gap is reserved between the concrete cover arch and the outer surface of the primary lining of the deep-buried side; and a supporting layer is arranged on the outer surface of the concrete cover arch.
The end part of the concrete cover arch and the support layer at the deep buried side of the tunnel extends to a support table at the bottom of the tunnel, and the bottom of the support table is fixedly connected with the mountain bedrock through a foot locking anchor rod; the shallow buried side end portions of the concrete cover arch and the supporting layer extend to the retaining wall.
The concrete cover arch and the supporting layer are both of reinforced concrete structures.
The main steel frame in the concrete cover arch is a triangular truss structure.
The main steel frame in the supporting layer is of a continuous inverted U-shaped structure.
One side of the retaining wall is provided with a supporting pile group.
Compared with the prior art, the utility model discloses an offset shallow-buried bias tunnel supporting structure, which adds a concrete cover arch of an offset structure on the outer surface of a primary lining of a tunnel according to the asymmetric load borne by a shallow-buried bias tunnel, wherein the concrete cover arch is attached to the outer surface of the primary lining of a shallow-buried side and leaves a buffer gap between the concrete cover arch and the outer surface of the primary lining of a deep-buried side; and the outer surface of the concrete sleeve arch is provided with the supporting layer, the design can ensure that the large load applied by the mountain deep-buried side firstly acts on the supporting layer and the concrete sleeve arch in sequence and then indirectly acts on the tunnel through the buffer gap, so that the load applied by the tunnel deep-buried side can be effectively reduced, the tunnel is prevented from being deformed by bias voltage, and the tunnel can be further well supported through two layers of supports.
The concrete sleeve arch and the supporting layer are both of reinforced concrete structures, and a main steel frame in the concrete sleeve arch is of a triangular structure; the main steel frame in the supporting layer is of a continuous inverted U-shaped structure, so that the supporting layer has good rigidity and stability, and the tunnel supporting is firm.
The utility model has the advantages that: the utility model discloses simple structure, easy construction, construction speed is fast, can bury the bias voltage tunnel to the shallowly and carry out firm support, avoids tunnel stress and bias voltage load and the deformation that causes, lining cutting crack loss, percolating water, diseases such as side and back slope destruction, improves the security in tunnel excavation or the operation, reduces the maintenance dynamics and the financial resources input in tunnel later stage, has good economical and practical.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, in which:
fig. 1 is a schematic cross-sectional structure diagram of the present invention.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are for purposes of illustration only and are not intended to limit the scope of the present invention.
As shown in fig. 1, the offset shallow-buried offset tunnel supporting structure comprises a concrete cover arch 2 arranged on the outer surface of a primary lining of a tunnel 1 and a retaining wall 6 on the shallow-buried side of the tunnel, wherein the concrete cover arch 2 is of an offset structure, is attached to the outer surface of the primary lining of the shallow-buried side, and leaves a buffer gap 202 between the concrete cover arch and the outer surface of the primary lining of the deep-buried side, and a supporting layer 3 of the offset structure matched with the concrete cover arch 2 is arranged on the outer surface of the concrete cover arch 2; larger load applied to the deeply buried side of the mountain is firstly sequentially acted on the supporting layer 3, the concrete cover arch 2 and the buffer gap 202, and then indirectly acted on the tunnel 1, so that the tunnel can be well supported, and the tunnel can be prevented from being deformed under bias voltage.
The concrete sleeve arch 2 and the tunnel deep-buried side end part of the supporting layer 3 extend to a supporting table 4 at the bottom of the tunnel, and the bottom of the supporting table is fixedly connected with the mountain bedrock through a foot locking anchor rod 5; the shallow side ends of the concrete housing arches 2 and the supporting layer 3 extend to the retaining wall 6.
The concrete cover arch 2 and the supporting layer 3 are both of reinforced concrete structures. The main steel frame 201 in the concrete cover arch 2 is of a triangular truss structure, so that the stability is good, and the tunnel support is firm; the main steel frame 301 in the supporting layer 3 is of a continuous structure in a shape like a Chinese character 'ji', and has good rigidity and stability through two-layer supporting, so that the tunnel supporting is firm.
The retaining wall 6 one side has laid a fender post crowd 7, not only guarantees that retaining wall 6 is firm, can improve the stability of massif moreover, further guarantees that the tunnel does not receive the bias voltage deformation.
The specific implementation steps are as follows:
(1) before the tunnel 1 is excavated, a supporting layer 3 and a concrete cover arch 2 of an offset structure are excavated and poured in sequence by taking the center line of the tunnel as a reference, and a retaining wall 6 is backfilled at the shallow side of the tunnel 1; the retaining wall 6 is backfilled by adopting the existing retaining wall structure and a backfilling process; the casting thickness of the supporting layer 3 is not less than 60cm, firstly, anchoring casting of a supporting table 4 at the bottom of the tunnel 1 and backfilling of a retaining wall 6 on the shallow side are completed, a continuous zigzag structure is applied between the supporting table 4 and the retaining wall 6 for supporting main bars, and concrete is poured to complete construction of the supporting layer 3; the casting thickness of the concrete sleeve arch 2 is not less than 50cm, a triangular truss structure is applied between the supporting platform 4 and the retaining wall 6 for main reinforcement supporting, and concrete is cast to complete the construction of the concrete sleeve arch 2.
(2) And arranging a supporting pile group 7, arranging more than 3 supporting piles on one side of the retaining wall 6, wherein the supporting piles can be installed by adopting the existing anti-slide pile structure and construction process.
(3) The tunnel 1 is constructed.
Through rational arrangement the supporting layer 3, the concrete cover arch 2 and the retaining wall 6 structure can effectively reduce the influence of deeply buried side biasing load on the tunnel, and the construction convenience is good, the construction efficiency is high, the tunnel stability is good, and the security is high.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention.
Claims (6)
1. The utility model provides a shallow bias voltage tunnel supporting construction that buries of offset type, includes that the setting is at retaining wall (6) of the shallow side of burying of concrete cover arch (2) and tunnel of tunnel (1) primary lining surface, its characterized in that: the concrete cover arch (2) is of an offset structure, is attached to the outer surface of the primary lining of the shallow buried side, and leaves a buffer gap (202) between the concrete cover arch and the outer surface of the primary lining of the deep buried side; and a supporting layer (3) matched with the concrete cover arch (2) is arranged on the outer surface of the concrete cover arch.
2. The offset shallow-buried bias tunnel supporting structure of claim 1, wherein: the concrete cover arch (2) and the tunnel deep-buried side end part of the supporting layer (3) extend to a supporting table (4) at the bottom of the tunnel, and the bottom of the supporting table (4) is fixedly connected with the mountain bedrock through a foot locking anchor rod (5); the shallow buried side end parts of the concrete cover arch (2) and the supporting layer (3) extend to the retaining wall (6).
3. The offset shallow-buried bias tunnel supporting structure of claim 2, wherein: the concrete cover arch (2) and the supporting layer (3) are both of reinforced concrete structures.
4. The offset shallow-buried bias tunnel supporting structure of claim 3, characterized in that: the main steel frame (201) in the concrete cover arch (2) is of a triangular truss structure.
5. The offset shallow-buried bias tunnel supporting structure of claim 3, characterized in that: the main steel frame (301) in the supporting layer (3) is of a continuous structure in a shape like a Chinese character 'ji'.
6. The offset shallow-buried bias tunnel supporting structure of claim 1, wherein: and one side of the retaining wall (6) is provided with a supporting pile group (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921611248.6U CN210530876U (en) | 2019-09-26 | 2019-09-26 | Shallow bias voltage tunnel supporting construction that buries of offset type |
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| CN201921611248.6U CN210530876U (en) | 2019-09-26 | 2019-09-26 | Shallow bias voltage tunnel supporting construction that buries of offset type |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111608701A (en) * | 2020-06-02 | 2020-09-01 | 中铁隧道局集团有限公司 | Method for treating roof collapse of shallow tunnel entrance section |
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2019
- 2019-09-26 CN CN201921611248.6U patent/CN210530876U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111608701A (en) * | 2020-06-02 | 2020-09-01 | 中铁隧道局集团有限公司 | Method for treating roof collapse of shallow tunnel entrance section |
| CN111608701B (en) * | 2020-06-02 | 2022-04-26 | 中铁隧道局集团有限公司 | Method for treating roof collapse of shallow tunnel entrance section |
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