CN112647536A - Open cut tunnel construction method without side slope disturbance - Google Patents

Open cut tunnel construction method without side slope disturbance Download PDF

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Publication number
CN112647536A
CN112647536A CN202011400251.0A CN202011400251A CN112647536A CN 112647536 A CN112647536 A CN 112647536A CN 202011400251 A CN202011400251 A CN 202011400251A CN 112647536 A CN112647536 A CN 112647536A
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CN
China
Prior art keywords
open cut
tunnel
cut tunnel
pipe curtain
slope
Prior art date
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.)
Pending
Application number
CN202011400251.0A
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Chinese (zh)
Inventor
袁松
冉龙洲
黎良仆
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan Communication Surveying and Design Institute Co Ltd
Original Assignee
Sichuan Communication Surveying and Design Institute Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sichuan Communication Surveying and Design Institute Co Ltd filed Critical Sichuan Communication Surveying and Design Institute Co Ltd
Priority to CN202011400251.0A priority Critical patent/CN112647536A/en
Publication of CN112647536A publication Critical patent/CN112647536A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/045Underground 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
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E02D15/04Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/20Securing of slopes or inclines
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/12Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/20Restraining of underground water by damming or interrupting the passage of underground water by displacing the water, e.g. by compressed air
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00Production methods
    • E02D2250/0023Cast, i.e. in situ or in a mold or other formwork
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0004Synthetics
    • E02D2300/0018Cement used as binder
    • E02D2300/002Concrete

Abstract

The invention relates to the technical field of road engineering, in particular to a method for constructing a clear tunnel without disturbing a side slope; the technical scheme is as follows: the method comprises the following steps of brushing a slope surface of a side slope at the open cut tunnel construction position; performing outside reinforced concrete construction at the open cut tunnel construction position to pour outside secondary lining concrete to the inside side slope and reserve a connector; after the second lining concrete on the outer side of the open cut tunnel reaches the design strength, a support is arranged below the second lining concrete on the outer side; performing pipe curtain construction on the outer side secondary lining concrete to insert one end of the pipe curtain into a mountain body on the inner side of the excavation influence line, and erecting the other end of the pipe curtain at the upper end of the inner side of the outer side secondary lining concrete; and (5) performing tunnel excavation construction below the pipe curtain according to the design width of the open cut tunnel, and pouring an inner side secondary lining. The method can be used for building open cut tunnels without disturbing the side slopes, and has important significance for mountain road construction and environmental protection.

Description

Open cut tunnel construction method without side slope disturbance
Technical Field
The invention relates to the technical field of road engineering, in particular to a method for constructing an open cut tunnel without disturbing a side slope.
Background
In the process of building or reconstructing and extending the mountain roads, for slope sections with poor geological conditions (such as rockfall development and loose surface layer), open cut tunnels or shed tunnels are often required to pass through so as to avoid potential safety hazards caused by rockfall or surface layer slump. However, the existing side slope is steep, the geological conditions are poor, and the stability of the side slope is poor, so that open cut tunnels or shed tunnels are difficult to arrange. The main performance is that during open cut tunnel construction, a side slope needs to be excavated, and side slope excavation disturbance can cause more extensive slump for some side slopes with poor geological conditions, and large-amplitude side slope treatment is needed; if the side slope is not excavated, a higher foundation needs to be arranged on the outer side, and the arrangement difficulty is high. Particularly, on some extension roads and the original single-lane road, how to extend the bidirectional lane and fully utilize the existing road to reduce the disturbance of slope excavation is a very important problem.
Disclosure of Invention
Aiming at the technical problem that open cut tunnels are difficult to construct in the slope sections with poor geological conditions; the invention provides a method for constructing a cut tunnel without disturbing a side slope, which can be used for constructing the cut tunnel without disturbing the side slope and has important significance for mountain road construction and environmental protection.
The invention is realized by the following technical scheme:
a method for constructing an open cut tunnel without disturbing a side slope comprises the following steps:
carrying out basic processing on the outer side of the open cut tunnel construction position according to the terrain;
locally brushing a slope surface of a side slope at the open cut tunnel construction position to form a step type side slope;
erecting a formwork at the open cut tunnel construction position to carry out outside reinforced concrete construction so as to pour the outside secondary lining concrete to the inside side slope, and reserving a connector;
after the second lining concrete on the outer side of the open cut tunnel reaches the design strength, laying a support below the second lining concrete on the outer side, and dismantling the mold frame;
performing pipe curtain construction on the outer side secondary lining concrete to insert one end of the pipe curtain into a mountain body on the inner side of the excavation influence line, and erecting the other end of the pipe curtain at the upper end of the inner side of the outer side secondary lining concrete;
after the pipe curtain construction is finished, longitudinally excavating along the open cut tunnel according to the design width of the open cut tunnel below the pipe curtain, wherein the longitudinal step distance of each excavation is less than or equal to 1m, carrying out steel frame support on the inner side slope after the excavation, and carrying out inner side secondary lining pouring to fixedly connect inner side secondary lining concrete and outer side secondary lining concrete to finish the construction of the open cut tunnel;
and after the open cut tunnel is constructed, backfilling on the outer second lining concrete to prevent the side slope from sliding.
According to the invention, the pipe curtain transversely penetrates through the two pieces of concrete lined on the outer side of the open cut tunnel, the pipe curtain is used as a supporting structure, and the pipe curtain and the two pieces of concrete lined on the outer side jointly support the side slope on the upper side of the open cut tunnel, so that the side slope is prevented from slipping and collapsing, the side slope treatment with a large amplitude is not needed, the open cut tunnel is prevented from being excavated to form a high and steep side slope, and a higher foundation is not needed to be arranged on the outer side. Meanwhile, when the tunnel is excavated under the protection of the pipe curtain, the inner side of the side slope is supported, and the sufficient stability of the side slope is ensured. Therefore, the invention can reduce the side slope excavation, further reduce the influence on the environment and has important significance on the mountain road construction and the environmental protection.
As the concrete implementation mode of the pipe curtain, the pipe curtain comprises a plurality of female pipes and male pipes, the two sides of each female pipe are provided with connecting grooves, the two sides of each male pipe are provided with connecting protrusions matched with the connecting grooves, and the female pipes and the male pipes are alternately connected to form the pipe curtain.
Preferably, the diameters of the mesh pipe and the supply pipe are both 200-600 mm, so that the pipe curtain has enough strength.
Preferably, the length of the pipe curtain inserted into the mountain body at the inner side of the excavation influence line is greater than or equal to 1m, so that the bearing capacity of the pipe curtain is improved, and the pipe curtain is prevented from deforming.
Furthermore, the steel pipe of pipe curtain reserves the slip casting hole to through the inboard space of slip casting hole filling steel pipe after the pipe curtain is set up to further reinforcing the intensity of pipe curtain and improving the stability of side slope, further reduce the disturbance of open cut tunnel construction to the side slope.
Furthermore, a plurality of guide pipes are buried in the mountain body on the inner side of the open cut tunnel while supporting, the guide pipes are fixedly connected with the steel frame, on one hand, underground water in the side slope can be discharged through the guide pipes, the extrusion of the side slope to the inner side of the open cut tunnel is reduced, on the other hand, the structural strength of the steel frame can be increased, and the stability of the side slope is further improved.
Preferably, when the tunnel excavation construction is carried out, the distance between the inner side secondary lining concrete and the steel frame support is less than or equal to 10 m.
The invention has the beneficial effects that:
1. the pipe curtain is used as a supporting structure to support the side slope on the upper side of the open cut tunnel together through the pipe curtain and the two outer-side lining concrete, so that the side slope is prevented from slipping and collapsing, the side slope treatment with large amplitude is not needed, the open cut tunnel is prevented from being excavated to form a high and steep side slope, and a higher foundation is not needed to be arranged on the outer side;
2. when the tunnel excavation is carried out under the protection of the pipe curtain, the inner side of the side slope is supported, so that the side slope has enough stability;
3. the grouting holes are reserved in the steel pipes of the pipe curtains, so that the space inside the steel pipes is filled through the grouting holes after the pipe curtains are erected, the strength of the pipe curtains is enhanced, the stability of the side slopes is improved, and the disturbance of open cut tunnel construction to the side slopes is reduced;
4. the guide pipes are buried in the mountain body on the inner side of the open cut tunnel while supporting, and are fixedly connected with the supporting steel frame, so that on one hand, underground water in the side slope can be discharged through the guide pipes, the extrusion of the side slope to the inner side of the open cut tunnel is reduced, on the other hand, the structural strength of the steel frame can be increased, and the stability of the side slope is further improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of a cut tunnel in the construction of the present invention;
FIG. 2 is a schematic view of a tube sheet of the present invention.
Reference numbers and corresponding part names in the drawings:
1-open cut tunnel, 2-side slope, 3-outer side two-lining concrete, 4-support, 5-pipe curtain, 51-female pipe, 52-male pipe, 6-inner side two-lining concrete, 8-guide pipe, 9-backfill and 10-set arch.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
A method for constructing an open cut tunnel without disturbing a side slope comprises the following steps:
carrying out basic processing on the outer side of the construction position of the open cut tunnel 1 according to the terrain;
locally brushing a slope surface of a side slope 2 at the construction position of the open cut tunnel 1 to form a step-type side slope;
erecting a formwork at the construction position of the open cut tunnel 1 to carry out outside reinforced concrete construction so as to pour outside secondary lining concrete 3 to the inside side slope 2 and reserve a connector;
after the second lining concrete 3 on the outer side of the open cut tunnel 1 reaches the design strength, a support 4 is arranged below the second lining concrete on the outer side, and a mold frame is removed;
constructing a pipe curtain 5 on the outer secondary lining concrete 3 so as to insert one end of the pipe curtain 5 into a mountain body on the inner side of the excavation influence line, and erecting the other end of the pipe curtain 5 at the upper end of the inner side of the outer secondary lining concrete 3;
after the construction of the pipe curtain 5 is finished, longitudinally excavating below the pipe curtain 5 along the open cut tunnel 1 according to the design width of the open cut tunnel 1, wherein the longitudinal step distance of each excavation is less than or equal to 1 m;
after excavation, carrying out steel frame support on the inner side slope 2, and carrying out inner side secondary lining pouring to fixedly connect inner side secondary lining concrete 6 and outer side secondary lining concrete 3 to complete construction of the open cut tunnel 1, wherein the interval between the inner side secondary lining concrete 6 and the steel frame support is less than or equal to 10 m;
after the open cut tunnel 1 is built, the outer side second lining concrete 3 and the inner side second lining concrete 6 have enough bonding strength, the support 4 is removed, and the outer side second lining concrete 3 is backfilled to prevent the slope 2 from sliding.
As a specific embodiment of the pipe curtain 5, the pipe curtain 5 is composed of a plurality of female pipes 51 and male pipes 52, wherein both sides of the female pipes 51 are provided with connecting grooves, both sides of the male pipes 52 are provided with connecting protrusions adapted to the connecting grooves, and the female pipes 51 and the male pipes 52 are alternately connected to form the pipe curtain 5.
Preferably, the diameters of the mesh pipe and the supply pipe are both 200-600 mm, so as to ensure that the pipe curtain 5 has enough strength.
Preferably, the length of the pipe curtain 5 inserted into the mountain body at the inner side of the excavation influence line is greater than or equal to 1m, so as to improve the bearing capacity of the pipe curtain 5 and prevent the pipe curtain 5 from deforming.
Furthermore, the steel pipe of pipe curtain 5 reserves the slip casting hole to through the inboard space of slip casting hole filling steel pipe after pipe curtain 5 sets up the completion, with the intensity of further reinforcing pipe curtain 5 and the stability that improves side slope 2, further reduce the disturbance of open cut tunnel 1 construction to side slope 2.
Furthermore, a plurality of guide pipes 8 are buried in the mountain body on the inner side of the open cut tunnel 1 while supporting, the guide pipes 8 are fixedly connected with the steel frame, on one hand, underground water in the side slope 2 can be discharged through the guide pipes 8, the extrusion of the side slope 2 to the inner side of the open cut tunnel 1 is reduced, on the other hand, the structural strength of the steel frame can be increased, and the stability of the side slope 2 is further improved.
According to the invention, the pipe curtain 5 transversely penetrates through the two pieces of concrete lining on the outer side of the open cut tunnel 1, the pipe curtain 5 is used as a supporting structure, the pipe curtain 5 and the two pieces of concrete lining on the outer side 3 jointly support the side slope 2 on the upper side of the open cut tunnel 1, so that the side slope 2 is prevented from slipping and collapsing, the side slope 2 is not greatly treated, the open cut tunnel 1 is prevented from being excavated to form a high and steep side slope 2, and a higher foundation is not required to be arranged on the outer side. Meanwhile, when the tunnel excavation is carried out under the protection of the pipe curtain 5, the inner side of the side slope 2 is supported, and the sufficient stability of the side slope 2 is ensured. Therefore, the excavation of the side slope 2 can be reduced, the influence on the environment is further reduced, and the method has important significance on the mountain road construction and the environment protection.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A method for constructing an open cut tunnel without disturbing a side slope is characterized by comprising the following steps:
brushing the slope surface of the side slope (2) at the construction position of the open cut tunnel (1);
performing outside reinforced concrete construction at the construction position of the open cut tunnel (1) to pour the outside secondary lining concrete (3) to the inside side slope (2), and reserving a connector;
after the outer side of the open cut tunnel (1) is lined with the concrete (3) to reach the design strength, a support (4) is arranged below the outer side of the concrete lined with the concrete;
constructing a pipe curtain (5) on the outer secondary lining concrete (3) so as to insert one end of the pipe curtain (5) into a mountain body on the inner side of an excavation influence line, and erecting the other end of the pipe curtain (5) at the upper end of the inner side of the outer secondary lining concrete (3);
and (3) performing tunnel excavation construction below the pipe curtain (5) according to the design width of the open cut tunnel (1), and performing inner-side two-lining pouring so as to fixedly connect the inner-side two-lining concrete and the outer-side two-lining concrete (3) to complete the construction of the open cut tunnel (1).
2. The method for constructing a clear tunnel without disturbing a slope according to claim 1, characterized in that before brushing the slope (2), the outside of the construction position of the clear tunnel (1) is subjected to a foundation treatment according to the terrain.
3. The method for building a clear tunnel without disturbing a slope according to claim 1, wherein the pipe curtain (5) is composed of a plurality of female pipes (51) and male pipes (52), wherein the female pipes (51) are provided with connecting grooves on both sides, the male pipes (52) are provided with connecting protrusions adapted to the connecting grooves on both sides, and the female pipes (51) and the male pipes (52) are alternately connected to form the pipe curtain (5).
4. The method for constructing an open cut tunnel without disturbing a slope according to claim 3, wherein the diameters of the mesh pipe and the supply pipe are both 200-600 mm.
5. The method for constructing an open cut tunnel without disturbing a slope according to claim 1, wherein the length of the pipe screen (5) inserted into the mountain body inside the excavation influence line is 1m or more.
6. The method for constructing an open cut tunnel without disturbing a slope according to claim 1, wherein grouting holes are reserved in the steel pipes of the pipe curtain (5) so as to fill the space inside the steel pipes through the grouting holes after the pipe curtain (5) is erected.
7. The method for constructing the open cut tunnel without disturbing the side slope according to claim 1, wherein when tunnel excavation construction is performed according to the designed width of the open cut tunnel (1) below the pipe curtain (5), the tunnel is excavated longitudinally along the open cut tunnel (1), and the longitudinal step distance of each excavation is less than or equal to 1 m.
8. The method for constructing the open cut tunnel without disturbing the side slope according to claim 1, wherein after tunnel excavation construction is performed according to the designed width of the open cut tunnel (1) below the pipe curtain (5), a mountain body on the inner side of the open cut tunnel (1) is supported by a steel frame.
9. The method for constructing the open cut tunnel without disturbing the side slope according to claim 8, wherein a plurality of guide pipes (8) are buried in the mountain body at the inner side of the open cut tunnel (1) while supporting, and the guide pipes (8) are fixedly connected with a steel frame.
10. The method for constructing an open cut tunnel without disturbing a slope according to claim 8, wherein the distance between the inner secondary lining concrete (6) and the steel frame support is less than or equal to 10m during the tunnel excavation construction.
CN202011400251.0A 2020-12-04 2020-12-04 Open cut tunnel construction method without side slope disturbance Pending CN112647536A (en)

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CN202011400251.0A CN112647536A (en) 2020-12-04 2020-12-04 Open cut tunnel construction method without side slope disturbance

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Application Number Priority Date Filing Date Title
CN202011400251.0A CN112647536A (en) 2020-12-04 2020-12-04 Open cut tunnel construction method without side slope disturbance

Publications (1)

Publication Number Publication Date
CN112647536A true CN112647536A (en) 2021-04-13

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5199819A (en) * 1990-06-22 1993-04-06 Marcel Matiere Semi-buried structure formed on a mountainside
CN101324072A (en) * 2008-07-30 2008-12-17 中国科学院武汉岩土力学研究所 Construction method of pervious rib type arch beam tunnel
CN103206219A (en) * 2013-05-06 2013-07-17 浙江省宏途交通建设有限公司 Holed excavation supporting structure for light and dark junction section of tunnel in bias pressure state and construction method
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
CN104989425A (en) * 2015-06-29 2015-10-21 上海市政工程设计研究总院(集团)有限公司 Underground excavation hole entering supporting structure and method
CN105804765A (en) * 2016-01-05 2016-07-27 中国科学院武汉岩土力学研究所 Permeable-rib type double-arch tunnel
CN106638509A (en) * 2017-01-04 2017-05-10 中国电建集团贵阳勘测设计研究院有限公司 Tunnel structure capable of reducing slope excavation and construction method thereof
CN108625879A (en) * 2018-05-28 2018-10-09 中铁第勘察设计院集团有限公司 Mountain Tunnels half-open and half-hidden structure and its construction method
CN110318770A (en) * 2019-06-26 2019-10-11 中铁二十三局集团第三工程有限公司 A kind of hazy start tunneling method of vcehicular tunnel

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5199819A (en) * 1990-06-22 1993-04-06 Marcel Matiere Semi-buried structure formed on a mountainside
CN101324072A (en) * 2008-07-30 2008-12-17 中国科学院武汉岩土力学研究所 Construction method of pervious rib type arch beam tunnel
CN103206219A (en) * 2013-05-06 2013-07-17 浙江省宏途交通建设有限公司 Holed excavation supporting structure for light and dark junction section of tunnel in bias pressure state and construction method
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
CN104989425A (en) * 2015-06-29 2015-10-21 上海市政工程设计研究总院(集团)有限公司 Underground excavation hole entering supporting structure and method
CN105804765A (en) * 2016-01-05 2016-07-27 中国科学院武汉岩土力学研究所 Permeable-rib type double-arch tunnel
CN106638509A (en) * 2017-01-04 2017-05-10 中国电建集团贵阳勘测设计研究院有限公司 Tunnel structure capable of reducing slope excavation and construction method thereof
CN108625879A (en) * 2018-05-28 2018-10-09 中铁第勘察设计院集团有限公司 Mountain Tunnels half-open and half-hidden structure and its construction method
CN110318770A (en) * 2019-06-26 2019-10-11 中铁二十三局集团第三工程有限公司 A kind of hazy start tunneling method of vcehicular tunnel

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