CN110820803B - Open excavation construction method for transverse connection channel of shield tunnel - Google Patents
Open excavation construction method for transverse connection channel of shield tunnel Download PDFInfo
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- CN110820803B CN110820803B CN201911097475.6A CN201911097475A CN110820803B CN 110820803 B CN110820803 B CN 110820803B CN 201911097475 A CN201911097475 A CN 201911097475A CN 110820803 B CN110820803 B CN 110820803B
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- 238000010276 construction Methods 0.000 title claims abstract description 46
- 238000009412 basement excavation Methods 0.000 title claims description 8
- 238000004891 communication Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims description 26
- 239000002689 soil Substances 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
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Abstract
The invention discloses an open cut construction method of a transverse connection channel of a shield tunnel, comprising the following steps of firstly, constructing a first underground continuous wall and a second underground continuous wall in the range of the transverse connection channel which is planned to be excavated and extending to the surrounding periphery of a left-line shield tunnel and a right-line shield tunnel; secondly, cutting and breaking underground continuous walls II in the left line shield tunnel and the right line shield tunnel by adopting a shield machine, and erecting spliced shield segment structures in the left line shield tunnel and the right line shield tunnel; step three, constructing foundation pit support layer by the foundation pit dug openly from the ground surface; fourthly, removing the shield segments on the left line and the shield segments on the right line; constructing a main tunnel frame structure and a transverse connection channel inner frame structure in the left-line shield tunnel and the right-line shield tunnel; and step six, backfilling earthwork above the main tunnel frame structure and the transverse communication channel frame structure, and dismantling the foundation pit support to recover the existing ground. The invention has small construction risk and low construction cost.
Description
Technical Field
The invention belongs to the technical field of tunnel transverse connection channel construction, and particularly relates to an open cut construction method of a shield tunnel transverse connection channel.
Background
At present, according to the design specifications and related technical standard requirements of the current highway, municipal and subway tunnels, communication channels are required to be arranged between the double-hole tunnels, and the arrangement types and the intervals are as follows: 1) the first volume civil engineering of highway Tunnel design Specification JTG 3370.1-2018 clause 4.5.1 specifies that a transverse channel is arranged between an upper highway tunnel and a lower highway tunnel, and the following specifications are met: firstly, the arrangement distance of the pedestrian transverse channels is preferably 250m and is not more than 350 m; secondly, the distance between the transverse channels is preferably 750m and not more than 1000 m. 2) City underground road engineering design Specification CJJ221-2015, article 8.3.5: firstly, a pedestrian transverse channel or a pedestrian evacuation channel is arranged on the double-hole underground road; secondly, the distance between the pedestrian transverse channels and the distance between the underground road and the entrance of the pedestrian evacuation channel are preferably 250-300 m. Article 8.3.6 specifies: firstly, urban underground roads of first, second and third types of passing motor vehicles, non-underwater underground roads are provided with a vehicle-driving transverse channel or a vehicle-driving evacuation channel, and the spacing of the vehicle-driving transverse channels and the distance between entrances leading to the vehicle-driving evacuation channel are preferably 200 m-500 m; secondly, underground roads at the bottom of the water are preferably provided with vehicle transverse channels or vehicle evacuation channels, and the spacing between the vehicle transverse channels and the distance between the underground roads and the entrances of the vehicle evacuation channels are preferably 500-1500 m. 3) The subway design Specification GB50157-2013 article 28.2.4 provides: two single line interval tunnels are provided with communication channels, and the distance between two adjacent communication channels is not more than 600 m. 4) Building design fire code GB50016-2014(2018 edition) article 12.1.6 provides: the arrangement of the cross-traffic passage or evacuation passage of the double-hole tunnel for passing motor vehicles shall conform to the following regulations: firstly, a vehicle transverse channel or a vehicle evacuation channel is preferably arranged in the underwater tunnel. The spacing between the vehicle transverse channels and the spacing between the tunnels and the entrance of the vehicle evacuation channels are preferably 1000-1500 m; secondly, a transverse vehicle channel or an evacuation vehicle channel is arranged in the non-underwater tunnel, and the interval between the transverse vehicle channels and the interval between the tunnel and the entrance of the evacuation vehicle channel are not larger than 1000 m. Article 12.1.7 specifies: the double-hole tunnel should be provided with a pedestrian crossing channel or a pedestrian evacuation channel, and should meet the following regulations: the spacing between the pedestrian transverse channels and the spacing between the tunnels and the entrance of the pedestrian evacuation channels are preferably 250-300 m. The regulations 1) to 4) indicate that different types of transverse communication channels, such as pedestrian transverse channels, pedestrian evacuation channels or vehicle transverse channels, should be arranged between the double-hole tunnels in order to meet the disaster prevention and rescue requirements of the double-hole tunnels. Different standard standards only slightly differ in the requirement of the arrangement distance of the transverse connection channel, and the arrangement of the transverse connection channel is irrelevant to the construction method adopted by the main line tunnel and the transverse connection channel.
The existing shield tunnel connection channel construction method comprises a mine method, a pipe jacking method and a shield method, and different methods have different characteristics and applicability. 1) A mine method: the technology of the contact channel constructed by the mine method is relatively mature, the application is extremely wide, and the mine method is mostly adopted for construction particularly in the construction of the contact channel of the urban subway tunnel in China. But the defects are obvious, such as low construction efficiency, poor economy and high safety risk, and meanwhile, the reinforcement effect of the soil around the contact channel has great influence on the success of construction. At present, ground reinforcing methods, in-hole grouting reinforcing methods and freezing methods are used for soil body reinforcing methods, wherein particularly the freezing method has the defects of numerous control influence factors of construction effects, great safety risks, long construction period, high cost, prominent operation and maintenance diseases, and many cases of construction failures caused by the freezing method are adopted in China. 2) Pipe jacking method: the pipe jacking method is used as a modern underground pipeline construction method, and during construction, the pipe is pressed into a soil layer through a force transmission jacking iron and a guide rail and a hydraulic jack supported on a back wall, and soil on the front side of the pipe is dug and carried away. And after the first pipe joint is completely jacked into the soil layer, connecting the second pipe joint behind the first pipe joint and jacking continuously, and jacking the first pipe joint in such a way to make a joint, thereby constructing a channel. The pipe jacking method has small influence on the environment, high mechanization degree and short construction period, but special equipment and a jacking rack need to be equipped during construction, the internal space of the finished structure of the main line shield tunnel is occupied, the influence on construction organization and construction period is large, and the stress and the influence on the structure are not clear in the construction process. At present, the domestic application cases are few. 3) A shield method: the shield method is adopted to directly cut and break the segments of the main line tunnel structure and apply the segments to the contact channel, and has the advantages of strong stratum adaptability, high mechanization degree, long tunneling distance, short construction period and the like. Meanwhile, the shield construction method also needs to be matched with a special small shield machine, a muddy water treatment system and a backup rack, occupies larger internal space of the finished structure of the main line shield tunnel, and has larger influence on construction organization and construction period. On the other hand, the construction of the small shield machine has the engineering risks of starting and receiving, and the construction cost is relatively high.
At present, no case report is found in the construction of a transverse connection channel of a main line shield tunnel section by adopting an open excavation method.
Disclosure of Invention
The invention provides an open excavation construction method for a transverse connection channel of a shield tunnel, and aims to solve the problems that the construction cost of the conventional transverse connection channel of the shield tunnel is high and the engineering risk is relatively high.
The invention adopts the following technical scheme:
an open excavation construction method for a transverse connection channel of a shield tunnel comprises the following construction steps:
step one, constructing a first underground continuous wall in a direction parallel to the tunnel line position and a second underground continuous wall in a direction vertical to the tunnel line position around the left line shield tunnel and the right line shield tunnel in the range of the horizontal communication channel planned to be excavated and extending to the left line shield tunnel and the right line shield tunnel, and enclosing to form a closed annular shaft;
cutting and breaking the second underground continuous wall in the direction perpendicular to the tunnel line position in the left line shield tunnel and the right line shield tunnel by using a shield machine, and erecting assembled shield segment structures in the left line shield tunnel and the right line shield tunnel;
step three, performing foundation pit support on the foundation pit dug by the ground surface downwards in the area surrounded by the first underground continuous wall and the second underground continuous wall layer by layer until the bottom elevation position of the transverse communication channel;
fourthly, dismantling the shield segments on the left line and the shield segments on the right line in the left line shield tunnel and the right line shield tunnel in the surrounding area and above the bottom elevation of the transverse communication channel;
constructing a main tunnel frame structure and a transverse connection channel inner frame structure in the left-line shield tunnel and the right-line shield tunnel;
and sixthly, backfilling earthwork above the main tunnel frame structure and the transverse connection channel frame structure, removing the foundation pit support, recovering the ground in the current situation, and completing construction of the transverse connection channel.
The invention has the following advantages:
the method of the invention is adopted to carry out the construction of the transverse connection channel of the shield tunnel, which not only can meet the requirement of the double-hole tunnel for arranging the transverse connection channel specified by the tunnel design specification, but also can reduce the risk and the construction cost of the connection channel adopting the mining method, the pipe jacking method and the shield method, and provides a good choice for the safe and effective construction of the transverse connection channel of the shield tunnel.
Description of the drawings:
FIG. 1 is a schematic plan view of the present invention.
Fig. 2 is a schematic cross-sectional structure of the present invention.
FIG. 3 is a schematic diagram of the structure of the invention in a vertical section.
Reference numerals:
1 underground diaphragm wall, 1-1 underground diaphragm wall I, 1-2 underground diaphragm wall II, 2 left line shield tunnel, 3 right line shield tunnel, 4 shield segment structure, 4-1 left line lower shield segment, 4-2 left line upper shield segment, 5-1 right line lower shield segment, 5-2 right line upper shield segment, 6 main tunnel frame structure, 7 transverse communication channel, 8 foundation pit support, 8-1 foundation pit support first cross brace, 8-2 foundation pit support Nth cross brace, 9 on-site ground surface support
The specific implementation mode is as follows:
the following further describes the embodiments of the present invention with reference to the drawings.
As shown in fig. 1, 2 and 3, an open excavation construction method for a transverse communication channel of a shield tunnel comprises the following construction steps:
step one, constructing an underground continuous wall 1-1 in a direction parallel to the tunnel line position and an underground continuous wall 2 in a direction vertical to the tunnel line position in the surrounding of the left line shield tunnel 2 and the right line shield tunnel 3 in the range of the horizontal communication channel 7 to be excavated and extending to the left line shield tunnel 2 and the right line shield tunnel 3, and enclosing to form a closed annular shaft, wherein the role of the closed annular shaft is to form a soil retaining and water stopping structure which is beneficial to forming later-stage excavation safety and stability, and the enclosed annular shaft is shown in the attached drawing 1;
secondly, cutting and breaking the underground continuous wall II 1-2 in the direction vertical to the tunnel line position in the left line shield tunnel 2 and the right line shield tunnel 3 by using a shield machine, erecting an assembled shield segment structure 4 in the left line shield tunnel 2 and the right line shield tunnel 3, and resisting the action of soil layer pressure and some special loads, and referring to the attached drawing 1;
step three, constructing foundation pit supports 8 layer by layer in the areas surrounded by the underground continuous walls I1-1 and the underground continuous walls II 1-2 from the ground surface to the bottom elevation position of the transverse communication channel 7, and referring to the attached figure 2;
fourthly, dismantling the shield segments 4-2 on the left line and the shield segments 5-2 on the right line in the shield tunnels 2 and 3 on the left line and the shield segments 5-2 on the right line in the surrounding area, wherein the shield segments are positioned above the bottom elevation of the transverse communication channel 7, and refer to the attached drawing 2;
constructing a main tunnel frame structure 6 in the left shield tunnel 2 and the right shield tunnel 3 and an inner frame structure in the transverse communication channel 7, and referring to the attached drawing 2;
and sixthly, backfilling earthwork above the main tunnel frame structure 6 and the transverse connection channel 7 frame structure, removing the foundation pit support 8, recovering the existing ground 9, and completing construction of the transverse connection channel 7, wherein the construction is shown in the attached drawing 3.
The underground continuous wall is constructed by adopting a conventional method, and the following construction method can be adopted: excavating along the periphery of a foundation pit under the condition of slurry wall protection to form a groove with a certain length, then placing the manufactured reinforcement cage into the groove section, performing underwater concrete pouring by adopting a conduit method to form a unit wall section, and mutually connecting all the wall sections by adopting a specific joint mode (such as a joint made of a joint pipe or a joint box) to form a continuous underground reinforced concrete wall.
Claims (1)
1. An open excavation construction method of a transverse connection channel of a shield tunnel is characterized in that: the method comprises the following construction steps:
step one, constructing an underground continuous wall I (1-1) parallel to the tunnel line position direction and an underground continuous wall II (1-2) vertical to the tunnel line position direction around the periphery of a left line shield tunnel (2) and a right line shield tunnel (3) in the range of a horizontal communication channel (7) planned to be excavated, and enclosing to form a closed annular shaft;
secondly, cutting and breaking the second underground continuous wall (1-2) in the direction vertical to the tunnel line position in the left line shield tunnel (2) and the right line shield tunnel (3) by using a shield machine, and erecting an assembled shield segment structure (4) in the left line shield tunnel (2) and the right line shield tunnel (3);
step three, constructing foundation pit supports (8) layer by layer in the areas surrounded by the underground continuous walls I (1-1) and the underground continuous walls II (1-2) from the ground surface to the bottom elevation position of the transverse communication channel (7);
fourthly, dismantling the shield segments (4-2) on the left line and the shield segments (5-2) on the right line in the shield tunnels (2, 3) on the left line and the shield segments (5-2) on the right line in the surrounding area and above the bottom elevation of the transverse communication channel (7);
constructing a main tunnel frame structure (6) in the left shield tunnel (2) and the right shield tunnel (3) and an inner frame structure in the transverse communication channel (7);
and sixthly, backfilling earthwork above the main tunnel frame structure (6) and the transverse connection channel (7) frame structure, removing the foundation pit support (8), recovering the existing ground (9), and completing construction of the transverse connection channel (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911097475.6A CN110820803B (en) | 2019-11-11 | 2019-11-11 | Open excavation construction method for transverse connection channel of shield tunnel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911097475.6A CN110820803B (en) | 2019-11-11 | 2019-11-11 | Open excavation construction method for transverse connection channel of shield tunnel |
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| CN110820803A CN110820803A (en) | 2020-02-21 |
| CN110820803B true CN110820803B (en) | 2021-06-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113187491A (en) * | 2021-05-17 | 2021-07-30 | 中铁十二局集团第四工程有限公司 | Subway tunnel transverse passage small shield construction process |
| CN115162408B (en) * | 2022-06-14 | 2024-02-02 | 长江勘测规划设计研究有限责任公司 | Construction method for repairing collapse tunnel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5341025A (en) * | 1976-09-24 | 1978-04-14 | Kubota Ltd | Underground structure |
| CN101598027A (en) * | 2009-07-10 | 2009-12-09 | 广东华隧建设股份有限公司 | The tunnel connection channel construction method in a kind of shield structure interval |
| CN105089670A (en) * | 2015-07-26 | 2015-11-25 | 北京工业大学 | Construction method for enlarging and excavating subway station on basis of parallel interval shield tunnel |
-
2019
- 2019-11-11 CN CN201911097475.6A patent/CN110820803B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5341025A (en) * | 1976-09-24 | 1978-04-14 | Kubota Ltd | Underground structure |
| CN101598027A (en) * | 2009-07-10 | 2009-12-09 | 广东华隧建设股份有限公司 | The tunnel connection channel construction method in a kind of shield structure interval |
| CN105089670A (en) * | 2015-07-26 | 2015-11-25 | 北京工业大学 | Construction method for enlarging and excavating subway station on basis of parallel interval shield tunnel |
Non-Patent Citations (2)
| Title |
|---|
| 国内结合盾构法修建地铁车站的技术方案分析;杨慧林;《铁道标准设计》;20091031;全文 * |
| 浅埋盾构隧道联络通道明挖施工;赵璞琪;《隧道建设》;20121130;第32卷(第增刊1期);第50-54页 * |
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Effective date of registration: 20240229 Address after: 100082, building 32, No. 3 North Main Street, Haidian District, Beijing, Xizhimen Patentee after: BEIJING GENERAL MUNICIPAL ENGINEERING DESIGN & RESEARCH INSTITUTE Co.,Ltd. Country or region after: China Patentee after: BEIJING ZHIYUAN ENGINEERING CONSTRUCTION SUPERVISION CO.,LTD. Address before: 100082, building 32, No. 3 North Main Street, Haidian District, Beijing, Xizhimen Patentee before: BEIJING GENERAL MUNICIPAL ENGINEERING DESIGN & RESEARCH INSTITUTE Co.,Ltd. Country or region before: China |