CN204386617U - A kind of consolidation grouting structure of low water head diversion tunnel - Google Patents
A kind of consolidation grouting structure of low water head diversion tunnel Download PDFInfo
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- CN204386617U CN204386617U CN201420857330.8U CN201420857330U CN204386617U CN 204386617 U CN204386617 U CN 204386617U CN 201420857330 U CN201420857330 U CN 201420857330U CN 204386617 U CN204386617 U CN 204386617U
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- consolidation grouting
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- diversion tunnel
- consolidation
- low water
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Abstract
The consolidation grouting structure of a kind of low water head diversion tunnel that the utility model provides; Comprise first liner timbering pneumatically placed concrete, consolidation grouting hole, the second stage of lining concrete, this structure is first after diversion tunnel completes excavation, carry out fist stage concrete supporting, after first liner timbering pneumatically placed concrete reaches prescribed strength, carry out the pore-creating of consolidation grouting hole, grouting, check that effect of consolidation grouting carries out the second stage of lining concrete construction after meeting design requirement.Solve original diversion tunnel consolidation grouting and there is the prolongation engineering overall duration; After having excavated, supporting causes Tunnel Collapse distortion and consolidation grouting construction to cause the problem of damage to concrete lining surface not in time.The utility model is simple, with strong points, safe and reliable, greatly reduction of erection time and cost saving, has good economic benefit and social benefit.
Description
Technical field
The utility model belongs to the grouting technique field in Hydraulic and Hydro-Power Engineering, particularly relates to a kind of consolidation grouting structure of low water head diversion tunnel.
Background technology
In Hydraulic and Hydro-Power Engineering, diversion tunnel, as conveyance structure, occupies very important status, and especially in run-of-river power station, the construction of diversion tunnel has controlling impact to the duration of power station entirety and cost.In traditional construction of Diversion Tunnels, after the concrete lining completing tunnel, just can carry out surrounding rock body consolidation grouting, extend so again the construction period of diversion tunnel, cause the delayed of power station overall duration; Because the construction of Diversion Tunnels duration is longer, after tunnel excavation completes, if carry out lining concrete construction not in time, under year surrounding rock body creep effect, Tunnel Collapse can be caused to be out of shape; If carry out consolidation grouting again after lining cutting completes simultaneously, just must hole on ready-made concrete, the extra cost adding pore-creating, easily interrupts reinforcing bar in lining concrete simultaneously; In grouting construction, additional injuries can be caused to lining concrete surface, strengthen local head loss, if carry out repairing, extra engineering cost can be increased.
Utility model content
For solving the problems of the technologies described above, the utility model provides a kind of consolidation grouting structure of low water head diversion tunnel, solve original diversion tunnel consolidation grouting exist extend the engineering overall duration, after excavation completes not in time supporting cause Tunnel Collapse to be out of shape and.
The utility model is achieved by the following technical programs.
A kind of consolidation grouting structure of low water head diversion tunnel, it is characterized in that: comprise first liner timbering pneumatically placed concrete, consolidation grouting hole, second phase lining concrete, consolidation grouting hole is at the external surface of the second stage of lining concrete, consolidation grouting hole becomes tubular structure with the second stage of lining concrete, the external surface in consolidation grouting hole contacts with rock mass, many first liner timbering pneumatically placed concretes are had at the external surface in consolidation grouting hole, first liner timbering pneumatically placed concrete gos deep in rock mass, after headrace tunnel excavation completes, carry out supporting concrete construction, by the time after supporting concrete reaches design strength, carry out the pore-creating of consolidation grouting hole, grouting, then the second stage of lining concrete construction is carried out.
Described diversion tunnel working head should not higher than 80m, and grouting pressure should not be greater than 0.8Mpa.
Between described consolidation grouting hole, array pitch is not more than 2.5 × 2.5m.
Described first liner timbering pneumatically placed concrete thickness >=10cm.
Strength grade >=the C20 of described first liner timbering pneumatically placed concrete.
The length in described consolidation grouting hole is not less than the half in Diversion Tunnel footpath.
The beneficial effects of the utility model are: this structure is first after diversion tunnel completes excavation, carry out first phase shotcrete support, after first liner timbering pneumatically placed concrete reaches prescribed strength, carry out the pore-creating of consolidation grouting hole, grouting, check that effect of consolidation grouting carries out the second stage of lining concrete construction after meeting design requirement.Solve original diversion tunnel consolidation grouting and there is the prolongation engineering overall duration; After having excavated, supporting causes Tunnel Collapse distortion and consolidation grouting construction to cause the problem of damage to concrete lining surface not in time.; The utility model is simple, with strong points, safe and reliable, and effectively can improve contact grouting design and improve contact grouting construction effect, reduction of erection time and cost saving greatly, has good economic benefit and social benefit.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In figure: 1-first liner timbering pneumatically placed concrete, 2-consolidation grouting hole, 3-second phase lining concrete.
Detailed description of the invention
Further describe the technical solution of the utility model below, but described in claimed scope is not limited to.
A consolidation grouting structure for low water head diversion tunnel, is characterized in that: comprise first liner timbering pneumatically placed concrete 1, consolidation grouting hole 2, the second stage of lining concrete 3.After headrace tunnel excavation completes, carry out supporting concrete 1 and construct, after supporting concrete 1 reaches design strength by the time, carry out consolidation grouting hole 2 pore-creating, consolidation grouting, then carry out the second stage of lining concrete 3 and construct.
The preparation method of the consolidation grouting structure of the low water head diversion tunnel that the present embodiment provides is:
(1) carry out headrace tunnel excavation, carry out first liner timbering pneumatically placed concrete 1 and construct, pneumatically placed concrete strength grade must not lower than C20, and thickness should not be less than 10cm, and thickness can adjust according to surrounding rock body situation.
(2) first liner timbering pneumatically placed concrete 1 is as consolidation grouting lid weight, after must waiting until that first liner timbering pneumatically placed concrete 1 intensity reaches design strength, and could to consolidation grouting hole 2 well cementing.
(3) be in the milk must strict controlled grouting pressure in consolidation grouting hole 2, must carry out physical prospecting detection simultaneously, check effect of consolidation grouting after grouting completes.
(4), according to check result, after country rock situation meets design requirement around, carry out the second stage of lining concrete 3 and construct.
Meanwhile, further, in order to ensure effect of consolidation grouting effect, the working head of diversion tunnel should not higher than 80m, and grouting pressure should not be greater than 0.8Mpa.
Meanwhile, further, in order to improve the steadiness of the structure of rock mass, described first liner timbering pneumatically placed concrete 1 thickness >=10cm.
Meanwhile, further, in order to improve the steadiness of the structure of rock mass, the strength grade >=C20 of described first liner timbering pneumatically placed concrete 1.
Meanwhile, further, in order to improve the steadiness of the structure of rock mass, the length that described first phase props up consolidation grout hole 2 can not be less than the half in Diversion Tunnel footpath.
Claims (5)
1. the consolidation grouting structure of a low water head diversion tunnel, it is characterized in that: comprise first liner timbering concrete (1), consolidation grouting hole (2), second phase lining concrete (3), wherein consolidation grouting hole (2) external surface in the second stage of lining concrete (3), consolidation grouting hole (2) becomes tubular structure with the second stage of lining concrete (3), the external surface in consolidation grouting hole (2) contacts with rock mass, many first liner timbering pneumatically placed concretes (1) are had at the external surface of consolidation grouting hole (2), first liner timbering pneumatically placed concrete (1) gos deep in rock mass.
2. the consolidation grouting structure of low water head diversion tunnel as claimed in claim 1, is characterized in that: between described consolidation grouting hole (2), array pitch is not more than 2.5 × 2.5m.
3. the consolidation grouting structure of low water head diversion tunnel as claimed in claim 1, is characterized in that: described first liner timbering pneumatically placed concrete (1) thickness >=10cm.
4. the consolidation grouting structure of low water head diversion tunnel as claimed in claim 1, is characterized in that: the strength grade >=C20 of described first liner timbering pneumatically placed concrete (1).
5. the consolidation grouting structure of low water head diversion tunnel as claimed in claim 1, is characterized in that: the length in described consolidation grouting hole (2) is not less than the half in Diversion Tunnel footpath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420857330.8U CN204386617U (en) | 2014-12-30 | 2014-12-30 | A kind of consolidation grouting structure of low water head diversion tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420857330.8U CN204386617U (en) | 2014-12-30 | 2014-12-30 | A kind of consolidation grouting structure of low water head diversion tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204386617U true CN204386617U (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420857330.8U Active CN204386617U (en) | 2014-12-30 | 2014-12-30 | A kind of consolidation grouting structure of low water head diversion tunnel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107165168A (en) * | 2017-07-13 | 2017-09-15 | 中国电建集团华东勘测设计研究院有限公司 | Full closure underground chamber backfill, consolidation grouting pipeline layout |
-
2014
- 2014-12-30 CN CN201420857330.8U patent/CN204386617U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107165168A (en) * | 2017-07-13 | 2017-09-15 | 中国电建集团华东勘测设计研究院有限公司 | Full closure underground chamber backfill, consolidation grouting pipeline layout |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |