CN214660231U - Shallow asymmetric supporting construction that buries bias voltage tunnel - Google Patents
Shallow asymmetric supporting construction that buries bias voltage tunnel Download PDFInfo
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- CN214660231U CN214660231U CN202023039874.8U CN202023039874U CN214660231U CN 214660231 U CN214660231 U CN 214660231U CN 202023039874 U CN202023039874 U CN 202023039874U CN 214660231 U CN214660231 U CN 214660231U
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- 238000010276 construction Methods 0.000 title claims description 15
- 238000009412 basement excavation Methods 0.000 claims abstract description 68
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 39
- 239000010959 steel Substances 0.000 claims abstract description 39
- 239000002689 soil Substances 0.000 claims abstract description 26
- 230000002093 peripheral effect Effects 0.000 claims abstract description 20
- 238000005507 spraying Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- 239000011435 rock Substances 0.000 abstract description 5
- 239000011378 shotcrete Substances 0.000 abstract 3
- 238000000034 method Methods 0.000 description 2
- 241001640558 Cotoneaster horizontalis Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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Abstract
本实用新型公开了一种浅埋偏压隧道非对称支护结构，包括外围土层，所述外围土层的侧壁内部设置有长管棚，所述长管棚呈210°圆周分布且关于外围土层的中心轴对称；所述外围土层的内部设置有若干锁脚钢管，所述锁脚钢管向下倾斜2°到10°；所述外围土层的内壁铺设有钢架层，所述钢架层的内壁喷射有喷砼层，所述喷砼层的上内壁固定连接有圆木顶撑；所述喷砼层的内壁设置有第一开挖部、第二开挖部、第三开挖部、第四开挖部、第五开挖部、第六开挖部，所述第一开挖部、第二开挖部围成蛋形，所述第三开挖部、第四开挖部围成蛋形。本实用新型中，蛋形结构能够维持隧道内部的稳定性，按照六个开挖部开挖可以缩短开挖循环，避免对围岩的过度扰动。
The utility model discloses an asymmetric support structure for a shallow-buried biased tunnel, which comprises a peripheral soil layer, and a long pipe shed is arranged inside a side wall of the peripheral soil layer. The central axis of the outer soil layer is symmetrical; a number of foot-locking steel pipes are arranged inside the outer soil layer, and the foot-locking steel pipes are inclined downward by 2° to 10°; the inner wall of the outer soil layer is laid with a steel frame layer, so The inner wall of the steel frame layer is sprayed with a sprayed concrete layer, and the upper inner wall of the sprayed concrete layer is fixedly connected with a log top support; the inner wall of the sprayed concrete layer is provided with a first excavation part, a second excavation part, a third The third excavation part, the fourth excavation part, the fifth excavation part and the sixth excavation part, the first excavation part and the second excavation part form an egg shape, the third excavation part, the third excavation part The four excavations are surrounded by an egg shape. In the utility model, the egg-shaped structure can maintain the stability of the interior of the tunnel, and the excavation cycle can be shortened according to the six excavation parts to avoid excessive disturbance to the surrounding rock.
Description
Technical Field
The utility model relates to a tunnel engineering technical field especially relates to an asymmetric supporting construction in shallow bias voltage tunnel that buries.
Background
The general principle is whether the tunnel roof covering can form a "natural arch", but determining the demarcation is difficult because it is dependent on many factors and can only be estimated empirically. The dividing depth of the deep and shallow buried tunnels is at least greater than the average height of the collapse direction and has a certain margin. The bias tunnel means that the surrounding rock pressure presents obvious nonuniformity due to objective reasons, and the support and construction of the tunnel are adversely affected under the action of bias load. With the continuous perfection of railway and road network layout in China, tunnel construction is carried out more and more under relatively complex conditions, and bias tunnel construction occupies a certain proportion.
In recent years, with the continuous development of tunnel engineering in China, in the planning and designing process of the current mountain tunnels, due to the problems of geological terrain conditions, line trends and the like, the tunnel engineering is inevitably wired along valleys, and therefore more and more shallow-buried bias tunnels are generated. Excavation of shallow-buried bias tunnels is always a big problem in the geotechnical engineering industry. After the tunnel is excavated, the stress of surrounding rocks on two sides of the section of the tunnel is greatly different due to the poor self-bearing capacity of the surrounding rocks, so that the tunnel generates bias voltage. Due to the situations, the construction difficulty and cost are increased, the construction deformation and stability control difficulty is increased, and the risk in construction is increased, so that the supporting structure convenient to construct has great demand.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects existing in the prior art and providing an asymmetric supporting structure of a shallow-buried bias tunnel.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the soil layer comprises a peripheral soil layer, wherein long pipe sheds are arranged inside the side wall of the peripheral soil layer, are circumferentially distributed at 210 degrees and are symmetrical about the central axis of the peripheral soil layer;
a plurality of foot locking steel pipes are arranged inside the peripheral soil layer, and incline downwards for 2-10 degrees;
a steel frame layer is laid on the inner wall of the peripheral soil layer, a concrete spraying layer is sprayed on the inner wall of the steel frame layer, and a log top support is fixedly connected to the upper inner wall of the concrete spraying layer;
the inner wall of spouting the concrete layer is provided with first excavation portion, second excavation portion, third excavation portion, fourth excavation portion, fifth excavation portion, the sixth excavation portion, first excavation portion, second excavation portion enclose into the egg shape, third excavation portion, fourth excavation portion also enclose into the egg shape.
As a further description of the above technical solution:
the lower side walls of the first excavation portion and the third excavation portion are arranged to be temporary steel frames, and the lower side wall of the fifth excavation portion is arranged to be a positioning tie bar.
As a further description of the above technical solution:
and temporary cross braces are arranged in the second excavation part and the fourth excavation part.
As a further description of the above technical solution:
and the right side wall of the third excavated part is provided with a plurality of advanced small guide pipes and temporary support pipes.
As a further description of the above technical solution:
and the inverted arch part of the peripheral soil layer and the right side wall of the second excavation part are uniformly provided with a plurality of small grouting guide pipes.
As a further description of the above technical solution:
the steel frame layer is made of I20b type I-shaped steel material.
As a further description of the above technical solution:
the temporary transverse support and the temporary steel frame are made of I20a type I-shaped steel materials.
As a further description of the above technical solution:
the temporary cross brace, the temporary steel frame, the advanced small conduit and the temporary supporting tube need to be dismantled after the tunnel excavation is completed.
The utility model discloses following beneficial effect has:
1. compared with the prior art, this shallow asymmetric supporting construction of bias tunnel that buries has set up six excavation portions, and two egg shape stable in structure that first excavation portion and second excavation portion, third excavation portion and fourth excavation portion are constituteed can maintain the inside stability in tunnel, shorten excavation circulation footage, reduce the charge volume, avoid the excessive disturbance to the country rock.
2. Compared with the prior art, this shallow asymmetric supporting construction in bias voltage tunnel that buries has set up the log shore, can improve the stability of fifth excavation portion greatly, prevents that the soil stone at middle part is not hard up.
3. Compared with the prior art, this shallow asymmetric supporting construction in bias voltage tunnel that buries has set up the lock foot steel pipe, can play the guard action to the excavation layer of lower floor, prevents to encircle the foot shrink and fall to encircle.
4. Compared with the prior art, this asymmetric supporting construction of shallow buried bias tunnel has set up 210 long pipe canopy circumference, can improve the stability of hunch layer greatly, prevents the collapse of hunch layer.
Drawings
Fig. 1 is a schematic view of an asymmetric supporting structure of a shallow-buried bias tunnel according to the present invention;
fig. 2 is a schematic view of a small grouting pipe of an asymmetric supporting structure of a shallow-buried bias tunnel according to the present invention;
fig. 3 is a schematic view of a small advanced duct of an asymmetric supporting structure of a shallow-buried bias tunnel according to the present invention;
fig. 4 is the utility model provides a shallow asymmetric supporting construction's of bias voltage tunnel excavation completion back sketch map that buries.
Illustration of the drawings:
1. an outer soil layer; 2. a steel frame layer; 3. spraying a concrete layer; 4. a temporary wale; 5. locking the steel pipe; 6. a temporary steel frame; 7. a long pipe shed; 8. supporting the log; 9. grouting a small conduit; 10. a small advanced catheter; 11. a first excavation section; 12. a second excavated portion; 13. a third open cut part; 14. a fourth excavated portion; 15. a fifth excavation part; 16. a sixth excavated portion; 17. and temporarily supporting the tube.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-4, the present invention provides an embodiment: including peripheral soil layer 1, the inside long pipe canopy 7 that is provided with of peripheral soil layer 1's lateral wall, long pipe canopy 7 is 210 circumference distributions and about peripheral soil layer 1's central axis symmetry, peripheral soil layer 1's inside is provided with a plurality of lock foot steel pipes 5, lock foot steel pipe 5 downward sloping 2 to 10, steel frame layer 2 has been laid to peripheral soil layer 1's inner wall, steel frame layer 2's inner wall sprays and has spouts concrete layer 3, spout concrete layer 3's last inner wall fixedly connected with log shore 8, peripheral soil layer 1's the inverted arch part and the right side wall of second excavation portion 12 all evenly are provided with a plurality of little pipes 9 of slip casting.
The inner wall of the concrete spraying layer 3 is provided with a first excavation portion 11, a second excavation portion 12, a third excavation portion 13, a fourth excavation portion 14, a fifth excavation portion 15 and a sixth excavation portion 16, the first excavation portion 11 and the second excavation portion 12 enclose an egg shape, the third excavation portion 13 and the fourth excavation portion 14 also enclose an egg shape, the lower side wall of the first excavation portion 11 and the third excavation portion 13 is set to be a temporary steel frame 6, the lower side wall of the fifth excavation portion 15 is set to be a positioning tie bar, the second excavation portion 12 and the fourth excavation portion 14 are internally provided with a temporary cross brace 4, the right side wall of the third excavation portion 13 is provided with a plurality of small advanced guide pipes 10 and a temporary support pipe 17, the steel frame layer 2 is made of I20b type I steel materials, and the temporary cross brace 4 and the temporary steel frame 6 are made of I20a type I steel materials. The temporary cross arm 4, the temporary steel frame 6, the advanced small conduit 10 and the temporary support pipe 17 need to be dismantled after the tunnel excavation is finished.
The working principle is as follows: the method comprises the steps of firstly arranging a long pipe shed 7 with a circumference of 210 degrees, then excavating a first excavated part 11, inserting a locking steel pipe 5 into the right side of the first excavated part 11 after excavation, then paving a steel plate on the right side, installing a positioning tie bar on the left side, installing a temporary steel frame 6 on the lower side, then spraying concrete, then excavating a second excavated part 12, installing a partial grouting small pipe 9, paving a steel plate, spraying concrete, installing a temporary cross brace 4, excavating a third excavated part 13 in the same sequence, then installing a leading small pipe 10 and a temporary support pipe 17, then excavating a fourth excavated part 14, a fifth excavated part 15 and a sixth excavated part 16, installing the remaining grouting small pipes 9, taking out the temporary support pipe 17, the leading small pipe 10, the temporary cross brace 4 and the temporary steel frame 6, and then completing excavation of a tunnel.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.
Claims (5)
1. The utility model provides an asymmetric supporting construction of shallow bias voltage tunnel that buries, includes peripheral soil layer (1), its characterized in that: the long pipe sheds (7) are arranged inside the side wall of the peripheral soil layer (1), the long pipe sheds (7) are circumferentially distributed in 210 degrees and are symmetrical about the central axis of the peripheral soil layer (1);
a plurality of foot locking steel pipes (5) are arranged inside the peripheral soil layer (1), and the foot locking steel pipes (5) are inclined downwards for 2-10 degrees;
a steel frame layer (2) is laid on the inner wall of the peripheral soil layer (1), a concrete spraying layer (3) is sprayed on the inner wall of the steel frame layer (2), and a log top support (8) is fixedly connected to the upper inner wall of the concrete spraying layer (3);
the inner wall of the concrete spraying layer (3) is provided with a first digging part (11), a second digging part (12), a third digging part (13), a fourth digging part (14), a fifth digging part (15) and a sixth digging part (16), the first digging part (11) and the second digging part (12) are enclosed into an egg shape, and the third digging part (13) and the fourth digging part (14) are also enclosed into an egg shape.
2. The asymmetric supporting structure of the shallow-buried bias tunnel according to claim 1, wherein: the lower lateral wall of first excavation portion (11), third excavation portion (13) sets up to interim steelframe (6), the lower lateral wall of fifth excavation portion (15) sets up to the location lacing wire, the inside of second excavation portion (12), fourth excavation portion (14) is provided with interim stull (4), interim steelframe (6) all adopt I20a type I steel material to make.
3. The asymmetric supporting structure of the shallow-buried bias tunnel according to claim 1, wherein: the right side wall of the third digging part (13) is provided with a plurality of small advanced guide pipes (10) and temporary support pipes (17).
4. The asymmetric supporting structure of the shallow-buried bias tunnel according to claim 1, wherein: and a plurality of small grouting pipes (9) are uniformly arranged on the inverted arch part of the peripheral soil layer (1) and the right side wall of the second excavation part (12).
5. The asymmetric supporting structure of the shallow-buried bias tunnel according to claim 1, wherein: the steel frame layer (2) is made of I20b type I-shaped steel materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023039874.8U CN214660231U (en) | 2020-12-17 | 2020-12-17 | Shallow asymmetric supporting construction that buries bias voltage tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023039874.8U CN214660231U (en) | 2020-12-17 | 2020-12-17 | Shallow asymmetric supporting construction that buries bias voltage tunnel |
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| Publication Number | Publication Date |
|---|---|
| CN214660231U true CN214660231U (en) | 2021-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023039874.8U Active CN214660231U (en) | 2020-12-17 | 2020-12-17 | Shallow asymmetric supporting construction that buries bias voltage tunnel |
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| Country | Link |
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| CN (1) | CN214660231U (en) |
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- 2020-12-17 CN CN202023039874.8U patent/CN214660231U/en active Active
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