CN212837860U - Rock stratum mine method tunnel is first to prop horse head door structure of opening a hole - Google Patents
Rock stratum mine method tunnel is first to prop horse head door structure of opening a hole Download PDFInfo
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- CN212837860U CN212837860U CN202020830921.1U CN202020830921U CN212837860U CN 212837860 U CN212837860 U CN 212837860U CN 202020830921 U CN202020830921 U CN 202020830921U CN 212837860 U CN212837860 U CN 212837860U
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Abstract
A preliminary supporting ingate structure of a rock stratum mine method tunnel simplifies construction procedures on the premise of not increasing extra waste engineering quantity basically, so that the preliminary supporting structure is sealed to form ring stress as soon as possible, and the safety of tunnel ingate construction of the rock stratum mine method tunnel is ensured. And at the joint of the main tunnel and the branch tunnel, longitudinal connecting ribs are densely arranged at the inner side and the outer side of a primary support steel frame of the main tunnel outside the arch crown of the branch tunnel to form a primary support hidden beam, and the primary support hidden beam is used as a large-angle arranged waist beam of an external anchor type support. The main tunnel and the branch tunnel joints are positioned in the branch primary support inner ring direction densely arranged primary support steel frames, and the cut-off main tunnel primary support steel frames and the branch tunnel primary support steel frames are welded when the branch tunnel is excavated to form a stress whole.
Description
Technical Field
The patent of the utility model relates to a tunnel engineering, in particular to rock stratum mine method first tunnel ingate structure of opening.
Background
The rock stratum mining method is a traditional construction method for building underground tunnel, which is suitable for the excavation of tunnel with deeper structure embedment and in rock stratum with certain self-stability capability, in particular to the excavation of tunnel deeply embedded in hard or harder rock mass. The basic procedures are as follows: drilling, charging, blasting and smoke dispersing, mucking and lining; the tunnel lining type is divided into a composite lining type and an anchor-shotcrete support type. The composite lining is made up by using anchor rod, reinforcing bar net and sprayed concrete as primary support (if necessary, using grid steel frame or advanced small guide tube as support) and using moulded (reinforced) concrete lining as secondary lining, and between the primary support and secondary lining a water-proofing isolating layer is set.
The mine method construction process is simple and flexible, and the design and construction process can be verified or modified according to the information feedback of the construction monitoring measurement, so that the purposes of safety and economy are achieved; different engineering measures and construction methods can be adopted for different geological conditions and surrounding environments, and pertinence is strong; different excavation modes can be adopted to treat the stratum with uneven hardness, and the treatment is convenient and easy; for the section with better geological conditions, the construction cost is saved; and meanwhile, the device has high flexibility suitable for various geological conditions and various section forms.
A large number of branch tunnel exists in the mine method tunnel, and the bridgehead opening construction is needed; during construction, the hole position is required to be broken, concrete is sprayed, and a grid steel frame (if any) is required to be broken; the original stress state of the tunnel is damaged by the opening construction, if the measures are improper, the original structure is easy to deform, the vault is sunk, and even the structure is damaged when the measures are serious. The construction scheme of 'support replacement' or 'big hole and small hole' is usually adopted in the early-stage hole breaking construction, but the 'support replacement' has the defects of complicated construction process and low speed, and is not beneficial to the rapid sealing and ring formation of a supporting structure; the scheme of 'big hole and small hole' has the defects of high big hole lifting, high expanding and digging height and large waste engineering quantity.
For the reasons, it is necessary to review and study the tunnel ingate opening construction of the rock stratum mining method.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a rock stratum mine method tunnel is first supported ingate structure is provided, under the prerequisite that does not increase extra abandonment engineering volume basically, simplify the construction process, make the first supported structure seal the cyclization atress as early as possible, ensure the security of rock stratum mine method tunnel ingate construction.
The utility model provides a technical scheme that its technical problem adopted as follows:
the utility model discloses a rock stratum mine method tunnel is first a horsehead door structure of opening a hole, including main hole tunnel and the tunnel of opening a hole and forming at its lateral wall horsehead door, its main hole preliminary bracing comprises injection concrete and the main hole preliminary bracing steelframe and the reinforcing bar net of burying underground in it, and the tunnel preliminary bracing comprises injection concrete layer and the tunnel preliminary bracing steelframe and the reinforcing bar net of burying underground in it, characterized by: at the interface of the main tunnel and the branch tunnel, longitudinal connecting ribs are densely arranged at the inner side and the outer side of a primary support steel frame of the main tunnel at the outer side of the arch crown of the branch tunnel to form a primary support hidden beam, and the primary support hidden beam is used as a waist beam of an external anchor type support which is arranged at a large angle; the main tunnel and branch tunnel joints are positioned in branch tunnel primary support inner ring direction densely arranged primary support steel frames, and the cut main tunnel primary support steel frames and the branch tunnel primary support steel frames are welded when the branch tunnel is excavated to form a stress whole.
The utility model has the advantages that when the main tunnel is excavated and supported, densely-arranged longitudinal connecting ribs are arranged inside and outside the main tunnel primary support steel frame outside the vault of the arch tunnel of the branch tunnel, and an external anchor type support is arranged; when the tunnel of the branch tunnel is broken and excavated, welding the truncated primary support steel frame of the main tunnel with the primary support steel frame of the branch tunnel, and meanwhile, densely arranging the primary support steel frames in the branch tunnel at the interface to form a whole stress body; the safety of the main tunnel is greatly improved when the initial support ingate of the rock stratum mine method tunnel is opened.
Drawings
The specification includes the following three drawings:
FIG. 1 is the utility model discloses a rock stratum mine method tunnel is first a ingate structure plan view schematic diagram
FIG. 2 is a cross-sectional view taken along line C-C of FIG. 1;
fig. 3 is a cross-sectional view taken along line D-D in fig. 1.
The component names and corresponding labels are shown in the figure: the main tunnel A, the branch tunnel B, the main tunnel preliminary bracing 11, the branch tunnel preliminary bracing 12, the main tunnel preliminary bracing steel frame 21, the branch tunnel preliminary bracing steel frame 22, the external anchor type bracing 23, the longitudinal connecting rib 24 and the preliminary bracing hidden beam 25.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the utility model discloses a rock stratum mine method tunnel primary support ingate structure of opening, including main tunnel A and the tunnel B of opening the hole and forming at its lateral wall ingate, its main tunnel preliminary bracing 11 comprises sprayed concrete layer and the main tunnel preliminary bracing steelframe 21 and the reinforcing bar net of burying underground in it, and tunnel preliminary bracing 12 comprises sprayed concrete layer and the tunnel preliminary bracing steelframe 22 and the reinforcing bar net of burying underground in it. And (4) after the excavation of the main tunnel A and the primary support 11 of the main tunnel are finished, constructing a branch tunnel B by breaking the tunnel at the side.
Referring to fig. 1 to 3, at the interface between the main tunnel a and the branch tunnel B, longitudinal connecting ribs 24 are densely arranged inside and outside the main tunnel primary support steel frame 21 at the outer side of the arch crown of the branch tunnel B to form a primary support hidden beam 25, and the primary support hidden beam 25 is used as a waist beam of the large-angle arranged external anchor type support 23. The joints of the main tunnel A and the branch tunnel B are positioned in the branch tunnel primary support 12 and surround the densely arranged branch tunnel primary support steel frames 22, and the cut-off main tunnel primary support steel frames 21 are welded with the branch tunnel primary support steel frames 22 during excavation of the branch tunnel B to form a whole stress body, so that the safety of the main tunnel is greatly improved when the tunnel jaw door of the tunnel is opened by a rock stratum mining method.
Referring to fig. 3, the driving angle of the outer anchor support 23 is perpendicular to the primary tunnel primary support 11 of the primary tunnel a, and a prestressed expanding shell type anchor rod or a prestressed anchor rod can be used. The outer anchor type supports 23 are arranged in main tunnel primary support steel frames 21 on the outer sides of arch tops of the branch tunnel B, and the longitudinal distance between the main tunnel A and the main tunnel primary support steel frames 21 is the same.
The number of the primary support steel frames 22 of the branch tunnel is 3-5 generally, and the inner ring of the primary support 12 is densely arranged.
The above is only used for illustrating the utility model relates to a basic principle of rock stratum mine method tunnel first support ingate structure, not will the utility model discloses a limit to show with concrete structure and application scope in, so all corresponding modification and the equivalent that probably are utilized all belong to the utility model discloses the patent range who applies for.
Claims (4)
1. A rock stratum mine method tunnel primary support ingate structure comprises a main tunnel (A) and a branch tunnel (B) formed by opening a hole at a lateral wall ingate of the main tunnel (A), wherein a main tunnel primary support (11) comprises a sprayed concrete layer, a main tunnel primary support steel frame (21) and a reinforcing mesh which are embedded in the sprayed concrete layer, and a branch tunnel primary support steel frame (22) and a reinforcing mesh which are embedded in the sprayed concrete layer, and the branch tunnel primary support steel frame (12) and the reinforcing mesh are formed, and the rock stratum mine method tunnel primary support ingate structure is characterized in that: longitudinal connecting ribs (24) are densely arranged at the inner side and the outer side of a primary support steel frame (21) of the main tunnel at the outer side of the arch crown of the branch tunnel (B) at the interface of the main tunnel (A) and the branch tunnel (B) to form a primary support hidden beam (25), and the primary support hidden beam (25) is used as a waist beam of an external anchor type support (23) which is arranged at a large angle; the joints of the main tunnel (A) and the branch tunnel (B) are positioned in the branch tunnel primary support (12) and are annularly and densely arranged with branch tunnel primary support steel frames (22), and the cut-off main tunnel primary support steel frames (21) are welded with the branch tunnel primary support steel frames (22) during excavation of the branch tunnel (B) to form a stress whole.
2. The initial support ingate structure of the lithostratigraphic mine method tunnel according to claim 1, which is characterized in that: the driving angle of the external anchor type support (23) is vertical to the primary tunnel support (11) of the primary tunnel (A), and a shell expansion type anchor rod or a prestressed anchor rod capable of applying prestress can be adopted.
3. The initial support ingate structure of the lithostratigraphic mine method tunnel according to claim 2, which is characterized in that: the outer anchor type supports (23) are arranged in main tunnel primary support steel frames (21) on the outer sides of the arch tops of the branch tunnel tunnels (B), and the longitudinal distance between the extension main tunnel tunnels (A) is the same as the distance between the main tunnel primary support steel frames (21).
4. The initial support ingate structure of the lithostratigraphic mine method tunnel according to claim 1, which is characterized in that: the number of the primary support steel frames (22) of the branch holes in the primary support (12) is 3-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020830921.1U CN212837860U (en) | 2020-05-18 | 2020-05-18 | Rock stratum mine method tunnel is first to prop horse head door structure of opening a hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020830921.1U CN212837860U (en) | 2020-05-18 | 2020-05-18 | Rock stratum mine method tunnel is first to prop horse head door structure of opening a hole |
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| Publication Number | Publication Date |
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| CN212837860U true CN212837860U (en) | 2021-03-30 |
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| CN202020830921.1U Active CN212837860U (en) | 2020-05-18 | 2020-05-18 | Rock stratum mine method tunnel is first to prop horse head door structure of opening a hole |
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| CN (1) | CN212837860U (en) |
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- 2020-05-18 CN CN202020830921.1U patent/CN212837860U/en active Active
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