CN211851850U - Little clear distance tunnel supporting construction suitable for collapsible loess - Google Patents
Little clear distance tunnel supporting construction suitable for collapsible loess Download PDFInfo
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- CN211851850U CN211851850U CN201922428520.3U CN201922428520U CN211851850U CN 211851850 U CN211851850 U CN 211851850U CN 201922428520 U CN201922428520 U CN 201922428520U CN 211851850 U CN211851850 U CN 211851850U
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- collapsible loess
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Abstract
The utility model discloses a little clean apart from tunnel supporting construction suitable for collapsible loess relates to tunnel support technical field, specifically is a little clean apart from tunnel supporting construction suitable for collapsible loess, including left hole, right hole, rock pillar prestressing force split anchor pole in the middle of fixedly connected with between left hole and the right hole, the surface in right hole is provided with positive hole preliminary bracing, the inside fixed mounting in right hole has side guide hole temporary support, side guide hole temporary support's right side is provided with the interim inverted arch in side guide hole. This little clear apart from tunnel supporting construction suitable for collapsible loess consolidates through basement high pressure jet grouting pile and middle rock mass prestressing force consolidates, makes the tunnel basement be in on can the basic unit of holding power, consolidates the middle soil body once more through drawing the stock simultaneously, has improved the stability of the middle rock mass in the tunnel, and the near-surface has promoted the safe and reliable degree in tunnel.
Description
Technical Field
The application relates to the technical field of tunnel support, more specifically relates to a little clear distance tunnel supporting construction suitable for collapsible loess.
Background
China is vast in breadth, geological conditions are complex, a highway design often encounters a weak stratum, a tunnel is often located in a loess stratum, meanwhile, partial areas are limited by geographical conditions, large-distance separation cannot be achieved, and therefore the problem that a small-clear-distance tunnel needs to be designed to solve the problem of insufficient space surface. However, the weak stratum small-clear-distance tunnel is most prone to causing damages such as insufficient foundation bearing capacity, middle rock mass damage and tunnel collapse and roof fall in the construction process, if the damage is not properly treated, the whole tunnel is most prone to deep collapse in the operation period, the primary support secondary lining is driven to be damaged, distorted and dislocated to different degrees, support invasion limit is caused, driving safety is seriously affected, and social influence is huge.
In the traditional design, the stability of the whole long and long small-clear-distance tunnel is limited to the stability of a single hole. In the collapsible loess stratum, the deformation of surrounding rocks and supporting structures is larger than that of other strata, and the sedimentation deformation of the surrounding rocks and the supporting structures needs to be strictly controlled; secondly, the loess foundation is soft and has collapsibility, the foundation needs to be reinforced and the collapsibility needs to be eliminated, the soil layer can be disturbed again in the treatment process, and the deformation of the surrounding rock and the supporting structure is aggravated; thirdly, because the construction period of excavation and support of the left, middle and right side walls is long, the staggered distance of each part is relatively large, the requirement of forming a ring as soon as possible cannot be met, the requirement of forming a stable structure is formed, the primary support is very easy to generate settlement of different degrees due to different time duration, and finally the limit invasion, the cracking and the accumulation of errors in butt joint of different parts of the primary support are caused to generate arch change, so that the safety is endangered, and the primary support structure cannot play the integral reliability of the original structure as much as possible.
Moreover, the rock mass stress is redistributed for many times due to the fact that the rock mass is finally influenced by the fact that the rock mass subsides day after day in the construction process, soil bodies are loose and easy to collapse, the construction risk is extremely high, and the requirement that a large cavern needs to be reserved in the highway operation electromechanical institute cannot be met.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, the present application proposes a small clear distance tunnel supporting structure suitable for collapsible loess to improve the above problems.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the utility model provides a little clear distance tunnel supporting construction suitable for collapsible loess, includes left hole, right hole, the rock pillar prestressing force is to drawing the stock in the middle of the fixedly connected with between left hole and the right hole, the surface in right hole is provided with positive hole preliminary bracing, the inside fixed mounting in right hole has side guide hole temporary bracing, side guide hole temporary bracing's right side is provided with the interim inverted arch in side guide hole, the bottom fixedly connected with basement high pressure jet grouting pile in right hole, the outside in right hole is provided with positive hole system anchor rod.
Optionally, an advanced small duct grouting support is fixedly installed at the top of the right hole, a main hole secondary lining is arranged at the bottom of the advanced small duct grouting support, and a circumferential and longitudinal drainage blind pipe and a composite waterproof plate are laid between the main hole primary support and the main hole secondary lining.
Optionally, the primary support of the main tunnel is of a composite lining structure and comprises a steel arch frame, a grouting guide pipe, a system anchor rod, a foot locking anchor rod, sprayed concrete and a reinforced net piece, and the secondary lining of the main tunnel is of a reinforced concrete structure.
Optionally, the shape of the side guide hole temporary support is arc-shaped, the number of the side guide hole temporary supports is two, and the side guide hole temporary supports are symmetrically distributed about the perpendicular bisector of the right hole, and a primary support locking anchor rod is arranged between the side guide hole temporary supports.
Optionally, the left hole is the same with the structure in right hole and about the perpendicular bisector symmetry of middle rock pillar prestressing force split stock, left hole and right hole all are the dome shape.
Optionally, the right tunnel is divided into six areas, namely a left side wall upper step excavation range, a left side wall lower step excavation range, a right side wall upper step excavation range, a right side wall lower step excavation range, a middle pilot tunnel upper step excavation range and a middle pilot tunnel lower step excavation range, by the side pilot tunnel temporary support and the side pilot tunnel temporary inverted arch.
The application provides a pair of little clean distance tunnel supporting construction suitable for collapsible loess possesses following beneficial effect:
1. this little clear apart from tunnel supporting construction suitable for collapsible loess consolidates through basement high pressure jet grouting pile and middle rock mass prestressing force consolidates, makes the tunnel basement be in on can the basic unit of holding power, consolidates the middle soil body once more through drawing the stock simultaneously, has improved the stability of the middle rock mass in the tunnel, and the near-surface has promoted the safe and reliable degree in tunnel.
2. This little clear apart tunnel supporting construction suitable for collapsible loess through adopting three pilot tunnel six steps method construction, excavate left and right sides pilot tunnel earlier, excavate well pilot tunnel again, realizes in big hole ization small hole, quick construction, divides the target of cyclization, through setting up the confined preliminary bracing system and the reinforcement system of ground, middle rock pillar that each other independent cyclization separately, successfully solved quality problems such as the fracture, distortion, deformation, local settlement and secondary lining fracture that produce in the operation that ground and peripheral rock mass are unstable and bring.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view illustrating a small-clearance tunnel supporting structure suitable for collapsible loess according to an embodiment of the present application;
in the figure: 1. a left hole; 2. a right hole; 3. primary supporting of the main tunnel; 4. secondary lining of the main tunnel; 5. a main hole system anchor rod; 6. primary support lock pin anchor rods; 7. the intermediate rock pillar is prestressed and opposite pulled to the anchor rod; 8. carrying out high-pressure jet grouting on the substrate; 9. temporarily supporting the side guide holes; 10. side guide hole temporary inverted arch; 11. excavating the upper step of the left side wall; 12. excavating the lower step of the left side wall; 13. excavating the upper step of the right side wall; 14. excavating the lower step of the right side wall; 15. excavating the upper step of the middle pilot tunnel; 16. excavating the range of the lower step of the middle pilot tunnel; 17. leading the small conduit to carry out grouting support; 18. circumferential and longitudinal drainage blind pipes and laying a composite waterproof board.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, the present invention provides a technical solution: a small clear distance tunnel supporting structure suitable for collapsible loess comprises a left hole 1 and a right hole 2, wherein the left hole 1 and the right hole 2 have the same structure and are symmetrical about a perpendicular bisector of a middle rock pillar prestress opposite pulling anchor rod 7, the left hole 1 and the right hole 2 are both in a circular arch shape, the middle rock pillar prestress opposite pulling anchor rod 7 is fixedly connected between the left hole 1 and the right hole 2, a middle soil body is reinforced again by the middle rock pillar prestress opposite pulling anchor rod 7 by arranging the middle rock pillar prestress opposite pulling anchor rod 7, the stability of a middle rock body of the tunnel is improved, the safety and reliability of the tunnel are improved on the near surface, a front hole primary support 3 is arranged on the outer surface of the right hole 2, the front hole primary support 3 is of a composite lining structure and is composed of a steel arch frame, a grouting guide pipe, a system anchor rod, a foot locking anchor rod, sprayed concrete and a steel mesh sheet, a front hole secondary lining 4 is of a reinforced concrete structure, the inner part of the right hole 2 is fixedly provided with a side guide hole temporary support 9, the shape of the side guide hole temporary support 9 is circular arc, the number of the side guide hole temporary supports 9 is two, the two side guide hole temporary supports are symmetrically distributed about a perpendicular bisector of the right hole 2, a primary support locking anchor rod 6 is arranged between the two side guide hole temporary supports 9, the right side of the side guide hole temporary support 9 is provided with a side guide hole temporary inverted arch 10, the bottom of the right hole 2 is fixedly connected with a base high-pressure jet grouting pile 8, the base high-pressure jet grouting pile 8 and a middle rock pillar prestress are used for matching a pulling anchor rod 7 by arranging the base high-pressure jet grouting pile 8, so that the tunnel base is positioned on a base layer which can hold force, the stability of the tunnel is improved, the tunnel is prevented from sinking, a positive hole system anchor rod 5 is arranged outside the right hole 2, the top of the right hole 2 is fixedly provided with a small forepoling grouting guide pipe 17, the bottom of, the method is characterized in that a circumferential and longitudinal drainage blind pipe and a laying composite waterproof board 18 are arranged between a primary support 3 of the main tunnel and a secondary lining 4 of the main tunnel, the circumferential and longitudinal drainage blind pipe and the laying composite waterproof board 18 are laid on the primary support 3 of the main tunnel and the secondary lining 4 of the main tunnel, the secondary lining 4 of the main tunnel is poured, the strength of the tunnel is improved, the tunnel is prevented from collapsing, and the problems of large deformation and high collapse risk of the weak tunnel are solved successfully, the right tunnel 2 is divided into six areas, namely a left side wall upper step excavation range 11, a left side wall lower step excavation range 12, a right side wall upper step excavation range 13, a right side wall lower step excavation range 14, a middle guide tunnel upper step excavation range 15 and a middle guide tunnel lower step excavation range 16, by arranging the left side wall upper step excavation range 11, the left side wall lower step excavation range 12, The method comprises the steps of excavating a right side wall upper step in an excavating range 13, excavating a right side wall lower step in an excavating range 14, excavating a middle pilot tunnel upper step in an excavating range 15 and excavating a middle pilot tunnel lower step in an excavating range 16, constructing by adopting a three-pilot tunnel six-step method, excavating a left pilot tunnel and a right pilot tunnel firstly, and excavating a middle pilot tunnel, so that the aims of forming small holes in large holes, constructing quickly and forming rings in parts are achieved.
To sum up, the small clear distance tunnel supporting structure suitable for collapsible loess provided by the application is used, and in sum, the small clear distance tunnel supporting structure suitable for collapsible loess determines the excavation supporting sequence firstly during use, then a small guide pipe in the front of the upper step excavation range 11 part of the left side wall is constructed, the upper step excavation range 11 of the left side wall is excavated, initial support, temporary support and temporary inverted arch are constructed, and a foot locking anchor rod is arranged; excavating a left side wall lower step excavation range 12 part, constructing a primary support, a temporary support, a permanent inverted arch and a high-pressure jet grouting pile at the position, then sequentially constructing a right side wall upper step excavation range 13, a right side wall lower step excavation range 14, a middle pilot tunnel upper step excavation range 15, and finally a middle pilot tunnel lower step excavation range 16, dismantling the temporary inverted arch and the temporary support in due time after the primary support is stable, integrally constructing inverted arch concrete and filling concrete, then installing annular and longitudinal drainage blind pipes and laying a composite waterproof plate 18 at the arch wall and the side wall parts, and finally pouring a secondary lining front tunnel secondary lining 4.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (6)
1. The utility model provides a little clean apart from tunnel supporting construction suitable for collapsible loess, includes left hole (1), right hole (2), its characterized in that: rock pillar prestressing force is to drawing stock (7) in the middle of fixedly connected with between left side hole (1) and right hole (2), the surface of right side hole (2) is provided with positive hole preliminary bracing (3), the inside fixed mounting of right side hole (2) has side guide hole temporary support (9), the right side of side guide hole temporary support (9) is provided with the interim inverted arch of side guide hole (10), the bottom fixedly connected with basement high pressure jet grouting pile (8) of right side hole (2), the outside of right side hole (2) is provided with positive hole system anchor rod (5).
2. The small clear distance tunnel supporting structure suitable for collapsible loess according to claim 1, wherein: the top fixed mounting of right side hole (2) has advanced little pipe slip casting to prop (17), the bottom of advanced little pipe slip casting to prop (17) is provided with positive hole secondary lining (4), lay hoop, vertical drainage blind pipe and lay combined type waterproof board (18) between positive hole preliminary bracing (3) and positive hole secondary lining (4).
3. The small clear distance tunnel supporting structure suitable for collapsible loess according to claim 2, wherein: the primary support (3) of the main tunnel is of a composite lining structure and comprises a steel arch frame, a grouting guide pipe, a system anchor rod, a foot locking anchor rod, sprayed concrete and a reinforced net piece, and the secondary lining (4) of the main tunnel is of a reinforced concrete structure.
4. The small clear distance tunnel supporting structure suitable for collapsible loess according to claim 1, wherein: the shape of the side guide hole temporary supports (9) is arc-shaped, the number of the side guide hole temporary supports (9) is two, and the side guide hole temporary supports are symmetrically distributed about the perpendicular bisector of the right hole (2), and a primary support foot locking anchor rod (6) is arranged between the two side guide hole temporary supports (9).
5. The small clear distance tunnel supporting structure suitable for collapsible loess according to claim 1, wherein: the structure of the left hole (1) is the same as that of the right hole (2), the left hole and the right hole are symmetrical about a perpendicular bisector of the middle rock pillar prestress opposite-pulling anchor rod (7), and the left hole (1) and the right hole (2) are both in a circular arch shape.
6. The small clear distance tunnel supporting structure suitable for collapsible loess according to claim 1, wherein: the right tunnel (2) is divided into six areas, namely a left side wall upper step excavation range (11), a left side wall lower step excavation range (12), a right side wall upper step excavation range (13), a right side wall lower step excavation range (14), a middle pilot tunnel upper step excavation range (15) and a middle pilot tunnel lower step excavation range (16), by a side pilot tunnel temporary support (9) and a side pilot tunnel temporary inverted arch (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922428520.3U CN211851850U (en) | 2019-12-27 | 2019-12-27 | Little clear distance tunnel supporting construction suitable for collapsible loess |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922428520.3U CN211851850U (en) | 2019-12-27 | 2019-12-27 | Little clear distance tunnel supporting construction suitable for collapsible loess |
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| CN211851850U true CN211851850U (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922428520.3U Expired - Fee Related CN211851850U (en) | 2019-12-27 | 2019-12-27 | Little clear distance tunnel supporting construction suitable for collapsible loess |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027466A (en) * | 2021-03-30 | 2021-06-25 | 中交一公局集团有限公司 | Underground excavation construction process for tunnel with extremely small clear distance |
| CN113266363A (en) * | 2021-05-27 | 2021-08-17 | 中铁十九局集团第三工程有限公司 | Excavation method for temporary intermediate wall reinforcing structure of large-section tunnel |
-
2019
- 2019-12-27 CN CN201922428520.3U patent/CN211851850U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027466A (en) * | 2021-03-30 | 2021-06-25 | 中交一公局集团有限公司 | Underground excavation construction process for tunnel with extremely small clear distance |
| CN113266363A (en) * | 2021-05-27 | 2021-08-17 | 中铁十九局集团第三工程有限公司 | Excavation method for temporary intermediate wall reinforcing structure of large-section tunnel |
| CN113266363B (en) * | 2021-05-27 | 2024-04-05 | 中铁十九局集团第三工程有限公司 | Excavation method for temporary intermediate wall reinforcing structure of large-section tunnel |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201103 Termination date: 20211227 |
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| CF01 | Termination of patent right due to non-payment of annual fee |