CN209277905U - Tunnel bilayer I-steel preliminary bracing structure - Google Patents
Tunnel bilayer I-steel preliminary bracing structure Download PDFInfo
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- CN209277905U CN209277905U CN201822276161.XU CN201822276161U CN209277905U CN 209277905 U CN209277905 U CN 209277905U CN 201822276161 U CN201822276161 U CN 201822276161U CN 209277905 U CN209277905 U CN 209277905U
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- arch bar
- tunnel
- outer layer
- support bracket
- internal layer
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Abstract
A kind of tunnel bilayer I-steel preliminary bracing structure.It includes internal layer support bracket, outer layer support bracket, steel fabric sheet and preliminary bracing layer；Internal layer support bracket is located at the internal layer arch bar on the inside of country rock along tunnel extending direction spacing by more and constitutes；Outer layer support bracket is located at the outer layer arch bar on the inside of country rock along tunnel extending direction spacing by more and constitutes, place an internal layer arch bar between adjacent two outer layer arch bars, outer layer arch bar and internal layer arch bar offset one from another in the position of tunnel radial direction and outer layer arch bar is closer to country rock；Steel fabric sheet is hung on country rock；Preliminary bracing layer is by being formed after the concrete setting that is injected on steel fabric sheet and internal layer support bracket and outer layer support bracket.The utility model advantage: it can prevent from guaranteeing safety for tunnel engineering and permanent operation security because being occurred first branch deformation in constructing tunnel by completely decomposed rich water granite unfavorable geological condition, cracking, collapsing, roof fall, excavating that surface current collapses, the adverse geological conditions such as Tunnel Water Leakage occur.
Description
Technical field
The utility model belongs to constructing tunnel protective equipment technical field, more particularly at the beginning of a kind of tunnel bilayer I-steel
Phase supporting construction.
Background technique
Tunnel is the engineering works being embedded in stratum, is a kind of form of human use's underground space.It is applied in tunnel
During work, common preliminary bracing structure is to be tunneled after applying long pipe shed using the tunneling of single layer H-shaped steel supporting, does not do and reinforces
Treatment measures, if but when the factors such as unfavorable geological conditions such as that there are completely weathered granites in tunnel is weak, water percolating capacity is big, buried depth is shallow,
It is likely to cause the adverse geological conditions such as preliminary bracing deformation, cracking, collapsing, roof fall using this conventional means to occur, therefore
There are larger security risk and permanent operation security risks.
Summary of the invention
To solve the above-mentioned problems, the purpose of this utility model is to provide a kind of tunnel bilayer I-steel preliminary bracing knots
Structure.
In order to achieve the above object, tunnel bilayer I-steel preliminary bracing structure provided by the utility model includes internal layer branch
Retaining frame, outer layer support bracket, steel fabric sheet and preliminary bracing layer；Wherein, the internal layer support bracket is to be extended by more along tunnel
The composition of the internal layer arch bar on the inside of country rock is arranged in direction spacing distance；Outer layer support bracket is also by more along tunnel extending direction
The composition of the outer layer arch bar on the inside of country rock is arranged in spacing distance, places an internal layer arch between adjacent two outer layer arch bars
Bar, outer layer arch bar and internal layer arch bar offset one from another in the position of tunnel radial direction and outer layer arch bar is closer to country rock；Steel wire
Mesh sheet is hung on the country rock in region set by internal layer support bracket and outer layer support bracket；Preliminary bracing layer is by being injected in steel wire
It is formed after concrete setting on piece and internal layer support bracket and outer layer support bracket.
The internal layer arch bar uses I18 I-steel；Outer layer arch bar uses I20a I-steel.
Distance of the adjacent inner layer arch bar and outer layer arch bar on tunnel extending direction is 0.6 meter, in tunnel
Distance radially is 0.3 meter.
Tunnel bilayer I-steel preliminary bracing structure provided by the utility model has the advantages that and can prevent because by complete
Weathering rich water granite unfavorable geological condition occur in constructing tunnel first branch deformation, cracking, collapsing, roof fall, excavate surface current collapse,
The adverse geological conditions such as Tunnel Water Leakage occur, and guarantee safety for tunnel engineering and permanent operation security.
Detailed description of the invention
Fig. 1 is to be illustrated using the tunnel lateral direction section of tunnel bilayer I-steel preliminary bracing structure provided by the utility model
Figure.
Fig. 2 be in Fig. 1 I-I to cross-sectional view.
Fig. 3 is to be illustrated using the tunnel longitudinal cross-section of tunnel bilayer I-steel preliminary bracing structure provided by the utility model
Figure.
Specific embodiment
Utility model is described in detail in the following with reference to the drawings and specific embodiments.
As shown in Fig. 1-Fig. 3, tunnel bilayer I-steel preliminary bracing structure provided by the utility model includes internal layer supporting
Frame 1, outer layer support bracket 2, steel fabric sheet and preliminary bracing layer 3；Wherein, the internal layer support bracket 1 is to be prolonged by more along tunnel
The internal layer arch bar that direction spacing distance is arranged on the inside of country rock is stretched to constitute；Outer layer support bracket 2 is also to be extended by more along tunnel
The composition of the outer layer arch bar on the inside of country rock is arranged in direction spacing distance, places an internal layer between adjacent two outer layer arch bars
Arch bar, outer layer arch bar and internal layer arch bar offset one from another in the position of tunnel radial direction and outer layer arch bar is closer to country rock；
Steel fabric sheet is hung on the country rock in region set by internal layer support bracket 1 and outer layer support bracket 2；Preliminary bracing layer 3 is by spraying
It is formed after the concrete setting on steel fabric sheet and internal layer support bracket 1 and outer layer support bracket 2.
The internal layer arch bar uses I18 I-steel；Outer layer arch bar uses I20a I-steel.
Distance of the adjacent inner layer arch bar and outer layer arch bar on tunnel extending direction is 0.6 meter, in tunnel
Distance radially is 0.3 meter.
Now tunnel bilayer I-steel preliminary bracing construction method provided by the utility model is described below:
(1) then tunnel step excavation starts from preliminary bracing structure, installs first on internal layer support bracket 1 first
A internal layer arch bar simultaneously sets lock foot anchor tube, then hangs steel fabric sheet on the country rock on the outside of first internal layer arch bar, it
The gunite concrete on above-mentioned steel fabric sheet and first internal layer arch bar afterwards；
It is outer that (2) first internal layer arch bars install first completed installed on outer layer support bracket 2 at 0.6 meter of side behind
Layer arch bar simultaneously sets lock foot anchor tube, and outer layer arch bar and internal layer arch bar offset one from another and outer stringcourse in the position of tunnel radial direction
Shape bar is 0.3 meter in the distance of tunnel radially closer to country rock, adjacent inner layer arch bar and outer layer arch bar；Then first
Steel fabric sheet is hung on country rock on the outside of a outer layer arch bar, is sprayed on above-mentioned steel fabric sheet and first outer layer arch bar later
Penetrate concrete；
(3) step (1) and (2) is repeated, until setting up all internal layer arch bar and outer layer arch bar, concrete setting
After can form preliminary bracing layer 3.
Claims (3)
1. a kind of tunnel bilayer I-steel preliminary bracing structure, it is characterised in that: the tunnel bilayer I-steel preliminary bracing
Structure includes internal layer support bracket (1), outer layer support bracket (2), steel fabric sheet and preliminary bracing layer (3)；Wherein, the internal layer branch
Retaining frame (1) is that the internal layer arch bar being arranged in by more along tunnel extending direction spacing distance on the inside of country rock is constituted；Outer layer supporting
Frame (2) is also that the outer layer arch bar on the inside of country rock is arranged in along tunnel extending direction spacing distance by more to constitute, and adjacent two
An internal layer arch bar is placed between outer layer arch bar, outer layer arch bar is wrong each other in the position of tunnel radial direction with internal layer arch bar
It opens and outer layer arch bar is closer to country rock；Steel fabric sheet is hung on region set by internal layer support bracket (1) and outer layer support bracket (2)
Country rock on；Preliminary bracing layer (3) is mixed on steel fabric sheet and internal layer support bracket (1) and outer layer support bracket (2) by being injected in
It is formed after solidifying soil solidification.
2. tunnel bilayer I-steel preliminary bracing structure according to claim 1, it is characterised in that: the internal layer arch
Bar uses 18 I-steel of I；Outer layer arch bar uses I20a I-steel.
3. tunnel bilayer I-steel preliminary bracing structure according to claim 1, it is characterised in that: the adjacent inner layer
The distance of arch bar and outer layer arch bar on tunnel extending direction is 0.6 meter, and in tunnel, distance radially is 0.3 meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822276161.XU CN209277905U (en) | 2018-12-27 | 2018-12-27 | Tunnel bilayer I-steel preliminary bracing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822276161.XU CN209277905U (en) | 2018-12-27 | 2018-12-27 | Tunnel bilayer I-steel preliminary bracing structure |
Publications (1)
| Publication Number | Publication Date |
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| CN209277905U true CN209277905U (en) | 2019-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822276161.XU Active CN209277905U (en) | 2018-12-27 | 2018-12-27 | Tunnel bilayer I-steel preliminary bracing structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110847932A (en) * | 2019-09-12 | 2020-02-28 | 中交投资南京有限公司 | Double-layer preliminary bracing construction method based on small clear distance tunnel |
| CN113464171A (en) * | 2021-06-10 | 2021-10-01 | 西华大学 | Water-rich freeze-thaw crushing surrounding rock tunnel supporting method |
-
2018
- 2018-12-27 CN CN201822276161.XU patent/CN209277905U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110847932A (en) * | 2019-09-12 | 2020-02-28 | 中交投资南京有限公司 | Double-layer preliminary bracing construction method based on small clear distance tunnel |
| CN113464171A (en) * | 2021-06-10 | 2021-10-01 | 西华大学 | Water-rich freeze-thaw crushing surrounding rock tunnel supporting method |
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