CN112459805A - Shield segment dismounting construction method - Google Patents
Shield segment dismounting construction method Download PDFInfo
- Publication number
- CN112459805A CN112459805A CN202011605370.XA CN202011605370A CN112459805A CN 112459805 A CN112459805 A CN 112459805A CN 202011605370 A CN202011605370 A CN 202011605370A CN 112459805 A CN112459805 A CN 112459805A
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- CN
- China
- Prior art keywords
- ring
- shield
- segment
- shield segment
- auxiliary
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000010276 construction Methods 0.000 title claims abstract description 32
- 238000009434 installation Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 239000002689 soil Substances 0.000 description 3
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
A shield segment dismounting construction method comprises the steps that a front supporting device and a rear supporting device are used for supporting shield segments of two adjacent rings in the front and the rear directions respectively, and then old shield segments between the front supporting device and the rear supporting device are dismounted; after removing the shield segment close to the next ring, temporarily supporting by using the auxiliary segment, then removing the shield segment close to the previous ring, and moving the auxiliary segment to the position close to the previous ring for temporarily supporting when installing a new shield segment close to the next ring; the auxiliary segment is smaller in ring width and outer diameter and larger in inner diameter relative to the shield segment; therefore, the shield segments are moved and replaced one by one along the tunnel direction until all the shield segments are replaced. By the aid of the shield segment dismounting construction method, the shield segments can be stably and quickly replaced, the shield segment dismounting construction method is extremely high in standardization degree, wide in universality and easy to operate, and safety and working quality of shield segment replacement can be effectively improved.
Description
Technical Field
The invention relates to road engineering construction, in particular to a construction method for dismounting shield segments in a tunnel.
Background
The tunnel is an engineering building buried in the ground, and comprises a highway tunnel passing through a mountain and a subway tunnel arranged underground. The tunnel is mainly constructed by adopting a shield machine, and shield segments are main assembly members for shield construction, are innermost barriers of the tunnel and play a role in resisting soil layer pressure, underground water pressure and some special loads. The shield segments are usually made of high-strength impervious concrete, and a plurality of shield segments are assembled into a ring shape in a lining assembly mode.
The shield segment has the characteristics of high strength, high durability and the like, but under the dual action of a long-term natural environment and a service environment, the shield segment inevitably has lining cracks, deformation, water leakage and other diseases in different degrees. The disease segment must be replaced in time to ensure the use safety of the tunnel. However, the replacement of the shield segment is very complicated and difficult, and an effective construction method for stably and accurately replacing the segment is lacked at present.
Disclosure of Invention
The invention aims to provide a construction method for dismounting shield segments, which is used for accurately and quickly replacing the shield segments and ensuring the use safety of a tunnel.
The shield segment dismounting construction method comprises the following steps
A. Supporting the old shield segments of the 0 th ring and the 3 rd ring by using a rear supporting device and a front supporting device respectively;
B. removing the old shield segment of the 1 st ring;
C. installing an auxiliary duct piece at the position, close to the 0 th ring, of the 1 st ring, wherein the ring width of the auxiliary duct piece is smaller than that of the shield duct piece, a longitudinal bolt hole is formed in the auxiliary duct piece corresponding to the shield duct piece, and the auxiliary duct piece is fixed by using a longitudinal connecting bolt;
D. removing the old shield segments of the 2 nd ring;
E. the auxiliary pipe piece moves forwards, the auxiliary pipe piece at the 1 st ring is dragged to the position, close to the 3 rd ring, of the 2 nd ring, and then the longitudinal connecting bolt is fixed;
F. installing a new shield segment at the 1 st ring;
G. the auxiliary pipe piece moves backwards, the auxiliary pipe piece at the 2 nd ring is dragged to the position close to the 1 st ring, and then the longitudinal connecting bolt is fixed;
H. the rear bearing device and the front bearing device release the support of the 0 th ring and the 3 rd ring, and then the old shield segment at the position is supported after moving forward for a distance of one ring;
I. repeating the steps B-H until the old shield segment of the last ring is removed, dragging the auxiliary segment to the tail end of the last ring, and then installing a new shield segment at the position of the penultimate ring;
J. removing the auxiliary segments, and then installing a new shield segment at the last ring;
K. and after the new shield segment is installed, back grouting is carried out.
According to the construction method for dismounting the shield segment, the shield segment of the two adjacent rings in the front and the back is respectively supported through the front supporting device and the back supporting device, and then the old damaged shield segment is dismounted; when a shield segment near the rear ring between the front supporting device and the rear supporting device is removed, the shield segment near the front ring is temporarily supported by using the auxiliary segment, and then the shield segment near the front ring is removed, and when a new shield segment is installed near the rear ring, the auxiliary segment is moved to the position near the front ring for temporarily supporting so as to ensure the stability of a soil layer structure; the width of the auxiliary duct piece is smaller than that of the shield duct piece, so that more space for assembling and disassembling the shield duct piece is reserved while the support performance can be effectively guaranteed, and the operation convenience is improved; therefore, the shield segments are moved and replaced one by one along the tunnel direction until all the shield segments are replaced. By the aid of the shield segment dismounting construction method, the shield segments can be stably and quickly replaced, the shield segment dismounting construction method is extremely high in standardization degree, wide in universality and easy to operate, and safety and working quality of shield segment replacement can be effectively improved.
Detailed Description
A shield segment dismounting construction method comprises the following steps
A. Supporting the old shield segments of the 0 th ring and the 3 rd ring by using a rear supporting device and a front supporting device respectively;
B. removing the old shield segment of the 1 st ring;
C. installing an auxiliary duct piece at the position, close to the 0 th ring, of the 1 st ring, wherein the ring width of the auxiliary duct piece is smaller than that of the shield duct piece, a longitudinal bolt hole is formed in the auxiliary duct piece corresponding to the shield duct piece, and the auxiliary duct piece is fixed by using a longitudinal connecting bolt;
D. removing the old shield segments of the 2 nd ring;
E. the auxiliary pipe piece moves forwards, the auxiliary pipe piece at the 1 st ring is dragged to the position, close to the 3 rd ring, of the 2 nd ring, and then the longitudinal connecting bolt is fixed;
F. installing a new shield segment at the 1 st ring;
G. the auxiliary pipe piece moves backwards, the auxiliary pipe piece at the 2 nd ring is dragged to the position close to the 1 st ring, and then the longitudinal connecting bolt is fixed;
H. the rear bearing device and the front bearing device release the support of the 0 th ring and the 3 rd ring, and then the old shield segment at the position is supported after moving forward for a distance of one ring;
I. repeating the steps B-H until the old shield segment of the last ring is removed, dragging the auxiliary segment to the tail end of the last ring, and then installing a new shield segment at the position of the penultimate ring;
J. removing the auxiliary segments, and then installing a new shield segment at the last ring;
K. and after the new shield segment is installed, back grouting is carried out.
According to the construction method for dismounting the shield segment, the shield segment of the two adjacent rings in the front and the back is respectively supported through the front supporting device and the back supporting device, and then the old damaged shield segment is dismounted; when a shield segment near the rear ring between the front supporting device and the rear supporting device is removed, the shield segment near the front ring is temporarily supported by using the auxiliary segment, and then the shield segment near the front ring is removed, and when a new shield segment is installed near the rear ring, the auxiliary segment is moved to the position near the front ring for temporarily supporting so as to ensure the stability of a soil layer structure; the width of the auxiliary duct piece is smaller than that of the shield duct piece, so that more space for assembling and disassembling the shield duct piece is reserved while the support performance can be effectively guaranteed, and the operation convenience is improved; therefore, the shield segments are moved and replaced one by one along the tunnel direction until all the shield segments are replaced. By the aid of the shield segment dismounting construction method, the shield segments can be stably and quickly replaced, the shield segment dismounting construction method is extremely high in standardization degree, wide in universality and easy to operate, and safety and working quality of shield segment replacement can be effectively improved.
According to the shield segment dismounting construction method, before old shield segments are dismounted, self-stability judgment is carried out on a stratum, drilling and coring can be carried out on the stratum behind the shield segments between a front supporting device and a rear supporting device specifically, so that the self-stability of the stratum is detected, next operation can be carried out if the self-stability is achieved, next operation can be carried out after the stratum is reinforced to the self-stability if the self-stability is not achieved, and therefore the stability of the stratum and the construction safety are guaranteed.
According to the shield segment dismounting construction method, the dismounting sequence of each ring of old shield segments is opposite to the assembling sequence, the top sealing blocks are firstly dismounted, then the adjacent blocks are dismounted, and finally the basic blocks are dismounted. In addition, when the shield segment of the 1 st ring is removed, a part of the widest part of the capping block is transversely cut by about 30cm so as to pull out the capping block; meanwhile, after the capping block is removed, measuring monitoring points are distributed at the through-looking position of the surface of the stratum at the removal position, and the self-stability of the stratum is judged according to the measuring result; and if the stratum is self-stable, continuously removing the stratum, otherwise, reassembling the removed capping blocks to the original positions.
The shield segment dismounting construction method has the advantages that the inner diameter of the auxiliary segment is larger than that of the shield segment, the outer diameter of the auxiliary segment is smaller than that of the shield segment, the ring width of the auxiliary segment can be specifically selected to be smaller than 30cm of the shield segment, the inner diameter of the auxiliary segment is larger than 10cm of the shield segment, and the outer diameter of the auxiliary segment is smaller than that of the shield segment by 2cm, so that the lightweight of the auxiliary segment can be improved, the movement is facilitated, the measurement visibility is not influenced, and the installation of a new shield segment. Before dismantling supplementary section of jurisdiction, measure the installation space of last ring shield section of jurisdiction, if the space is not enough then carry out the preliminary treatment to shield section of jurisdiction or sealing rod to satisfy the installation needs of shield section of jurisdiction. Before installing a new shield segment, the stratum with the wrong platform is treated, and the shield segment can be over-excavated or under-excavated.
Claims (10)
1. A shield segment dismounting construction method is characterized by comprising the following steps:
A. supporting the old shield segments of the 0 th ring and the 3 rd ring by using a rear supporting device and a front supporting device respectively;
B. removing the old shield segment of the 1 st ring;
C. installing an auxiliary duct piece at the position, close to the 0 th ring, of the 1 st ring, wherein the ring width of the auxiliary duct piece is smaller than that of the shield duct piece, a longitudinal bolt hole is formed in the auxiliary duct piece corresponding to the shield duct piece, and the auxiliary duct piece is fixed by using a longitudinal connecting bolt;
D. removing the old shield segments of the 2 nd ring;
E. the auxiliary pipe piece moves forwards, the auxiliary pipe piece at the 1 st ring is dragged to the position, close to the 3 rd ring, of the 2 nd ring, and then the longitudinal connecting bolt is fixed;
F. installing a new shield segment at the 1 st ring;
G. the auxiliary pipe piece moves backwards, the auxiliary pipe piece at the 2 nd ring is dragged to the position close to the 1 st ring, and then the longitudinal connecting bolt is fixed;
H. the rear bearing device and the front bearing device release the support of the 0 th ring and the 3 rd ring, and then the old shield segment at the position is supported after moving forward for a distance of one ring;
I. repeating the steps B-H until the old shield segment of the last ring is removed, dragging the auxiliary segment to the tail end of the last ring, and then installing a new shield segment at the position of the penultimate ring;
J. removing the auxiliary segments, and then installing a new shield segment at the last ring;
K. and after the new shield segment is installed, back grouting is carried out.
2. The shield segment dismounting construction method according to claim 1, characterized in that: before the old shield segment is dismantled, the self-stability of the stratum is judged.
3. The shield segment dismounting construction method according to claim 2, characterized in that: and drilling and coring the stratum behind the shield segment between the front supporting device and the rear supporting device so as to detect the self-stability of the stratum.
4. The shield segment dismounting construction method according to claim 1, characterized in that: the removing sequence of each ring of old shield segments is that the capping block is removed firstly, then the adjacent block is removed, and finally the basic block is removed.
5. The shield segment dismounting construction method according to claim 4, characterized in that: when the shield segment of the 1 st ring is removed, a part is transversely cut at the widest part of the capping block.
6. The shield segment dismounting construction method according to claim 4 or 5, characterized in that: and after the top sealing block is removed, measuring monitoring points are arranged at the through position of the surface of the stratum at the removal position, and the self-stability of the stratum is judged according to the measuring result.
7. The shield segment dismounting construction method according to claim 1, characterized in that: the inner diameter of the auxiliary segment is larger than that of the shield segment and the outer diameter of the auxiliary segment is smaller than that of the shield segment.
8. The shield segment dismounting construction method according to claim 7, characterized in that: the width of the auxiliary segment is less than 30cm of the shield segment, the inner diameter of the auxiliary segment is greater than 10cm of the shield segment, and the outer diameter of the auxiliary segment is less than 2cm of the shield segment.
9. The shield segment dismounting construction method according to claim 1, 7 or 8, characterized in that: before the auxiliary duct piece is removed, the installation space of the last ring of shield duct pieces is measured, and if the space is insufficient, the shield duct pieces or the water stop strips are preprocessed.
10. The shield segment dismounting construction method according to claim 1, characterized in that: and before installing a new shield segment, treating the stratum at the position with the dislocation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011605370.XA CN112459805B (en) | 2020-12-30 | 2020-12-30 | Shield segment dismounting construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011605370.XA CN112459805B (en) | 2020-12-30 | 2020-12-30 | Shield segment dismounting construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112459805A true CN112459805A (en) | 2021-03-09 |
| CN112459805B CN112459805B (en) | 2022-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011605370.XA Active CN112459805B (en) | 2020-12-30 | 2020-12-30 | Shield segment dismounting construction method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07133700A (en) * | 1993-11-10 | 1995-05-23 | Daiho Constr Co Ltd | Method of building shield tunnel |
| CN103291317A (en) * | 2013-06-19 | 2013-09-11 | 上海隧道工程股份有限公司 | Construction method for old tunnel segment detaching and tunnel expanding and tunnel expanding machine |
| CN105649647A (en) * | 2014-11-11 | 2016-06-08 | 粤水电轨道交通建设有限公司 | Dismounting method of negative ring duct piece in shield tunneling tunnel |
| CN108005686A (en) * | 2018-01-12 | 2018-05-08 | 中铁上海工程局集团有限公司 | With the service channel combined steel section of jurisdiction at main tunnel connecting position and construction method |
| CN111271121A (en) * | 2020-02-12 | 2020-06-12 | 中铁五局集团有限公司 | Shield tunnel segment dismantling construction method |
| CN212225242U (en) * | 2020-04-23 | 2020-12-25 | 佛山鑫一诚建筑工程管理咨询有限公司 | Detachable light steel-UHPC combined shield segment |
-
2020
- 2020-12-30 CN CN202011605370.XA patent/CN112459805B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07133700A (en) * | 1993-11-10 | 1995-05-23 | Daiho Constr Co Ltd | Method of building shield tunnel |
| CN103291317A (en) * | 2013-06-19 | 2013-09-11 | 上海隧道工程股份有限公司 | Construction method for old tunnel segment detaching and tunnel expanding and tunnel expanding machine |
| CN105649647A (en) * | 2014-11-11 | 2016-06-08 | 粤水电轨道交通建设有限公司 | Dismounting method of negative ring duct piece in shield tunneling tunnel |
| CN108005686A (en) * | 2018-01-12 | 2018-05-08 | 中铁上海工程局集团有限公司 | With the service channel combined steel section of jurisdiction at main tunnel connecting position and construction method |
| CN111271121A (en) * | 2020-02-12 | 2020-06-12 | 中铁五局集团有限公司 | Shield tunnel segment dismantling construction method |
| CN212225242U (en) * | 2020-04-23 | 2020-12-25 | 佛山鑫一诚建筑工程管理咨询有限公司 | Detachable light steel-UHPC combined shield segment |
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| Publication number | Publication date |
|---|---|
| CN112459805B (en) | 2022-05-20 |
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