CN103410532A - T-typed step-by-step parallel excavation method of soft-rock tunnel cavern - Google Patents
T-typed step-by-step parallel excavation method of soft-rock tunnel cavern Download PDFInfo
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- CN103410532A CN103410532A CN2013103410978A CN201310341097A CN103410532A CN 103410532 A CN103410532 A CN 103410532A CN 2013103410978 A CN2013103410978 A CN 2013103410978A CN 201310341097 A CN201310341097 A CN 201310341097A CN 103410532 A CN103410532 A CN 103410532A
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Abstract
The invention discloses a T-type step-by-step parallel excavation method of a soft-rock tunnel cavern. The method includes steps: excavating a section I of an upper pilot tunnel to a design line and cooperatively deslagging at the same time; mounting steel arcs, meshes and connecting bars and spraying C25 concrete for protection of a liner design line; excavating a section II and a section III of upper and lower core steps; synchronously excavating a section IV and a section V of a side wall portion; mounting the steel arcs, the meshes and the connecting bars and spraying the C25 concrete for protection of the liner design line. In the method, a conventional excavation construction sequence of the section I-the section IV-the section V-the section II (III) of the new Austrian tunneling method is adjusted into the section I-the section II (III)-the section IV-(the section V) and the upper and lower core steps are staggered for 15-20m, so that construction disturbance is avoided. The upper and lower core steps are excavated into slopes, and therefore height difference between the steps is reduced. By the modification of the method, construction progress is improved, and construction safety is guaranteed at the same time.
Description
Technical field
The present invention relates to the tunnel excavation method of the engineering constructions such as a kind of building, mine, railway, especially relate to the parallel excavation method of T-shaped substep of a kind of soft rock tunnel cavern.
Background technology
The tunnel cavern is once excavation, and its surrounding rock body distortion is very fast, and early stage pressure is large, if job practices and auxiliary construction improper measures are easy to cause large landslide and Support Deformation accident, has a strong impact on engineering construction safety.Conventional construction order I district —Ⅱ district,--—Ⅴ district, —Ⅳ district (III district) of New Austrian Tunneling Method, if the sand gravel tunnel excavation adopts this sequentially to construct, the mutual interference of upper and lower scope of operation construction phase is large, and core earthen platform difference in height is larger, construction safety hidden danger is large, seriously restricts the excavation construction progress.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides the parallel excavation method of T-shaped substep of a kind of soft rock tunnel cavern, the method has not only improved construction speed, has guaranteed simultaneously construction safety.
Purpose of the present invention is carried out specific implementation by the following technical programs:
The parallel excavation method of the T-shaped substep of a kind of soft rock tunnel cavern is characterized in that carrying out according to following steps:
(1) pilot tunnel I district on excavation, be excavated to design lines, coordinates and slag tap simultaneously;
(2) carry out reinforcing bar bow member, net sheet and link the installation of muscle, and C25 concrete to lining design lines is protected in spray;
(3) excavation core up/down steps II district and III district;
(4) synchronously carry out the excavation in abutment wall part IV district and V district;
(5) carry out reinforcing bar bow member, net sheet and link the installation of muscle, and C25 concrete to lining design lines is protected in spray.
Between described core up/down steps, excavate sloping, reduce the difference in height between the core up/down steps.
The described core up/down steps level 15 ~ 20m that is staggered.
Every cyclic advance is 0.5 ~ 1.2m.
The parallel excavation method of T-shaped substep of a kind of soft rock tunnel of the present invention cavern, the conventional excavation construction sequence of construction I district of New Austrian Tunneling Method →Ⅱ district,--→Ⅴ district, →Ⅳ district (III district) is adjusted into to (III district) →Ⅳ district, →Ⅱ district, I district--(V district), 15～20m simultaneously is staggered core up/down steps level, avoided construction to disturb, and by core up/down steps excavation sloping, reduce between step difference in height.The improvement of the method, not only improved construction speed, guaranteed simultaneously construction safety.
The accompanying drawing explanation
Below according to drawings and embodiments the present invention is described in further detail.
Fig. 1 is the sequence of construction schematic diagram of the parallel excavation method of T-shaped substep of a kind of soft rock tunnel of the present invention cavern.
The specific embodiment
Embodiment 1
As shown in Figure 1, the parallel excavation method of T-shaped substep of the described a kind of soft rock tunnel of embodiment of the present invention cavern, on excavation, pilot tunnel I district, manually be excavated to design lines with pneumatic pick, spade, uses simultaneously 0.2m
3Little excavator coordinates the muck removal cooperation to slag tap; After has excavated in upper pilot tunnel I district, carry out immediately reinforcing bar bow member, net sheet and link the installation of muscle, and C25 concrete to lining design lines is protected in spray; Then use 0.2 m
3Little excavator excavation core up/down steps II district and III district; II head of district 3m left and right; Then synchronously carry out the excavation in abutment wall part IV district and V district, adopt little excavator directly to excavate the dress quarrel, 3～5 5T tipping trucks transport, artificial pick, the pneumatic pick used coordinates excavation machine maintenance to design surface simultaneously, after having excavated, carry out immediately reinforcing bar bow member, net sheet and link the installation of muscle, and spray protects C25 concrete to lining design lines, every cyclic advance is 0.5m.For avoid construction to disturb as far as possible, the core up/down steps level of the answering 15m that is staggered is advisable, and will between the core up/down steps, excavate sloping, to reduce the difference in height between the core up/down steps, has so namely saved investment, has guaranteed simultaneously safety and construction speed.
Embodiment 2
The embodiment of the present embodiment and embodiment 1 is basic identical, and difference is, every cyclic advance is 1.2m, the core up/down steps level 20m that is staggered.
Embodiment 3
The embodiment of the present embodiment and embodiment 1 is basic identical, and difference is, every cyclic advance is 0.8m, the core up/down steps level 18m that is staggered.
Finally it should be noted that: the foregoing is only the preferred embodiments of the present invention; be not limited to the present invention; for a person skilled in the art; it still can be regulated the technical scheme that aforementioned each embodiment puts down in writing; all any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.
Claims (4)
1. the parallel excavation method of the T-shaped substep of a soft rock tunnel cavern is characterized in that carrying out according to following steps:
(1) pilot tunnel I district on excavation, be excavated to design lines, coordinates and slag tap simultaneously;
(2) carry out reinforcing bar bow member, net sheet and link the installation of muscle, and C25 concrete to lining design lines is protected in spray;
(3) excavation core up/down steps II district and III district;
(4) synchronously carry out the excavation in abutment wall part IV district and V district;
(5) carry out reinforcing bar bow member, net sheet and link the installation of muscle, and C25 concrete to lining design lines is protected in spray.
2. the parallel excavation method of T-shaped substep of a kind of soft rock tunnel according to claim 1 cavern, is characterized in that: between described core up/down steps, excavate sloping, to reduce the difference in height between the core up/down steps.
3. the parallel excavation method of T-shaped substep of a kind of soft rock tunnel according to claim 1 and 2 cavern is characterized in that: the described core up/down steps level 15 ~ 20m that is staggered.
4. according to the parallel excavation method of T-shaped substep of the described a kind of soft rock tunnel of claim 3 any one cavern, it is characterized in that: every cyclic advance is 0.5 ~ 1.2m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103410978A CN103410532A (en) | 2013-08-07 | 2013-08-07 | T-typed step-by-step parallel excavation method of soft-rock tunnel cavern |
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| CN2013103410978A CN103410532A (en) | 2013-08-07 | 2013-08-07 | T-typed step-by-step parallel excavation method of soft-rock tunnel cavern |
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| CN103410532A true CN103410532A (en) | 2013-11-27 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939115A (en) * | 2014-05-04 | 2014-07-23 | 北京市市政工程设计研究总院有限公司 | Semi-subsurface excavation method construction shed tunnel method and structure |
| CN103953368A (en) * | 2014-05-14 | 2014-07-30 | 山东黄金矿业(莱州)有限公司三山岛金矿 | Three-layer combined tunneling construction method for chamber of extra-large elevator |
| CN105421462A (en) * | 2015-11-04 | 2016-03-23 | 广西壮族自治区交通规划勘察设计研究院 | Construction and protection method for extremely soft rock foundation |
| CN110939472A (en) * | 2019-12-24 | 2020-03-31 | 中矿金业股份有限公司 | Construction method of large-section ultrahigh chamber |
| CN113605901A (en) * | 2021-07-20 | 2021-11-05 | 西南交通大学 | Strong anchor middle pilot tunnel construction method based on extra-large section tunnel construction |
Citations (2)
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| JPH08170484A (en) * | 1994-12-19 | 1996-07-02 | Shimizu Corp | Construction method of large cross section tunnel |
| CN102926757A (en) * | 2012-09-07 | 2013-02-13 | 中铁五局（集团）有限公司 | Construction method of two-sidestep and four-step excavation support of weak large-span tunnel of mountain ridge |
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2013
- 2013-08-07 CN CN2013103410978A patent/CN103410532A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08170484A (en) * | 1994-12-19 | 1996-07-02 | Shimizu Corp | Construction method of large cross section tunnel |
| CN102926757A (en) * | 2012-09-07 | 2013-02-13 | 中铁五局（集团）有限公司 | Construction method of two-sidestep and four-step excavation support of weak large-span tunnel of mountain ridge |
Non-Patent Citations (3)
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| 任靓等: "《某软岩隧洞施工》", 《西部探矿工程》 * |
| 汪忠: "《短台阶分步平行开挖法软岩隧洞施工》", 《四川水力》 * |
| 王洪葵: "《某软岩隧洞施工》", 《中国水运》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939115A (en) * | 2014-05-04 | 2014-07-23 | 北京市市政工程设计研究总院有限公司 | Semi-subsurface excavation method construction shed tunnel method and structure |
| CN103953368A (en) * | 2014-05-14 | 2014-07-30 | 山东黄金矿业(莱州)有限公司三山岛金矿 | Three-layer combined tunneling construction method for chamber of extra-large elevator |
| CN103953368B (en) * | 2014-05-14 | 2015-11-11 | 山东黄金矿业(莱州)有限公司三山岛金矿 | Three layers of associating tunneling construction method of especially big elevator chamber |
| CN105421462A (en) * | 2015-11-04 | 2016-03-23 | 广西壮族自治区交通规划勘察设计研究院 | Construction and protection method for extremely soft rock foundation |
| CN105421462B (en) * | 2015-11-04 | 2018-05-25 | 广西交通规划勘察设计研究院有限公司 | The construction and guard method of ultimate soft rock ground |
| CN110939472A (en) * | 2019-12-24 | 2020-03-31 | 中矿金业股份有限公司 | Construction method of large-section ultrahigh chamber |
| CN113605901A (en) * | 2021-07-20 | 2021-11-05 | 西南交通大学 | Strong anchor middle pilot tunnel construction method based on extra-large section tunnel construction |
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Application publication date: 20131127 |