CN213269907U - Double-layer superposed primary support arch cover structure of large-span underground excavation tunnel of urban rail transit - Google Patents
Double-layer superposed primary support arch cover structure of large-span underground excavation tunnel of urban rail transit Download PDFInfo
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- CN213269907U CN213269907U CN202020831940.6U CN202020831940U CN213269907U CN 213269907 U CN213269907 U CN 213269907U CN 202020831940 U CN202020831940 U CN 202020831940U CN 213269907 U CN213269907 U CN 213269907U
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Abstract
The double-layer superposed primary arch cover structure of the urban rail transit long-span underground excavation tunnel effectively improves the stability of the primary arch cover structure, the timeliness of the primary arch cover structure and the superposed effect of the primary support of the first layer and the primary support of the second layer under the complex and variable geological conditions, and improves the safety during construction. The arch part of the second-layer primary supporting structure is gradually thickened from the arch top to the arch springing, the large arch springing which is connected with the arch part into a whole is arranged at the end parts of two sides, the large arch springing is a cast-in-place reinforced concrete longitudinal beam, and the large arch springing at two sides is provided with a locking angle anchor rod or a grouting anchor pipe. The first layer of primary supporting structure and the second layer of primary supporting structure are connected into a whole through the connecting component to form a superposed structure which commonly bears the vertical pressure of the stratum.
Description
Technical Field
The patent of the utility model relates to a tunnel engineering, in particular to double-deck coincide of undercut tunnel is first to be propped up hunch-cover structure suitable for urban rail transit strides greatly.
Background
The bed rock burial depth of urban areas such as Chongqing, Dalian, mansion gate, Qingdao and the like is shallow, so that the use frequency of the large-span underground excavation construction method for urban rail transit is higher and higher in order to avoid the difficult problems of large amount of pipeline migration and improvement, greening migration, traffic jam and the like caused by conventional open excavation or cover excavation construction; limited by the buried depth of a line and the lifting height of a station building, a major structure of a large-span underground excavation tunnel is located in a rock stratum with a soft upper part and a hard lower part, namely a vault is located in strongly weathered and moderately weathered rocks, a vault foot is located in moderately weathered or slightly weathered rocks, and a major part of the major structure is located in moderately weathered and slightly weathered rocks.
The traditional construction method of the urban rail transit long-span underground excavation tunnel comprises a double-side-wall pit guiding method, a hole pile (column) method, a two-lining arch cover method and the like, but with the development of the underground excavation technology, a double-layer superposed primary arch cover method which is integrated with the design concept of an arch bridge and a subway cover excavation sequential construction method is adopted in urban subways such as Qingdao, Chongqing and Guiyang on a large scale, and the construction method has the following characteristics:
1) after the initial support of the arch part is looped, the lower section is not excavated immediately, but a second layer of initial support with a large arch foot of the arch part is constructed, a superposed primary support structure, namely a primary support arch cover, is formed by the first layer of initial support and the second layer of initial support, the vertical load is transmitted to the stable bedrock at two sides through the primary support arch cover, and the lower half section is excavated under the protection of the primary support arch cover.
2) The lower half section of the tunnel is basically medium and slightly weathered rock, and the geological condition is good, so the tunnel can be excavated and supported by adopting a construction method similar to an open-cut rock foundation pit, namely layered blasting excavation, and the side wall is timely sprayed and anchored until the excavation is finished.
3) The secondary lining is poured from bottom to top in sequence after the excavation is finished, so that the construction quality of the secondary lining and the waterproof layer can be ensured.
The method is limited by complex variability (such as broken zone and fault development) of large-span underground tunnel engineering geology, and the key for ensuring the stability of the large arch springing of the primary arch cover is whether the method is successful or not; meanwhile, how to quickly form the primary support arch cover and ensure the overlapping effect of the primary support of the first layer and the primary support of the second layer are also technical problems which have to be solved.
For the reasons, it is necessary to deeply research the double-layer overlapped primary arch cover structure of the large-span underground tunnel of urban rail transit, so as to facilitate the popularization and application of the construction method.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a double-deck coincide of urban rail transit stride undercut tunnel is a hunch lid structure just to effectively improve just the stability of propping up the hunch lid structure under complicated changeable geological conditions, just prop up the promptness that the hunch lid structure formed and the coincide effect that the first layer just propped up and the second floor just propped up, improve the security during the construction.
The utility model provides a technical scheme that its technical problem adopted as follows:
the utility model discloses urban rail transit strides secretly digs double-deck coincide of tunnel just props hunch lid structure greatly, first layer preliminary bracing structure, second floor preliminary bracing structure, characterized by including upper and lower coincide: the arch part of the secondary primary support structure is gradually thickened from the arch top to the arch springing, the end parts of two sides are provided with large arch springing which is connected with the arch part into a whole, the large arch springing is a cast-in-place reinforced concrete longitudinal beam, and the large arch springing at two sides is provided with a locking angle anchor rod or a grouting anchor pipe; the first layer of primary supporting structure and the second layer of primary supporting structure are connected into a whole through the connecting member to form a superposed structure for bearing the vertical pressure of the stratum together.
The utility model has the advantages that the arch part of the primary supporting structure of the second layer is gradually thickened from the arch top to the arch springing, the large arch springing which is connected with the arch part into a whole is arranged at the end parts of the two sides, the large arch springing is a longitudinal beam of cast-in-place reinforced concrete, and the locking angle anchor rod or the grouting anchor pipe is arranged at the large arch springing at the two sides, so that the integrity and the stability of the arch springing can be greatly improved; the arch parts of the first layer of primary supporting structure and the second layer of primary supporting structure adopt a sprayed concrete layer and a grid steel frame structure, so that the construction is convenient and fast, the quick forming of the arch cover is facilitated, and a stress system is formed; the primary supporting structure of the first layer and the primary supporting structure of the second layer are connected into a whole through the connecting component to form an overlapped structure which commonly bears the vertical pressure of the stratum, and the safety of the primary supporting arch cover can be effectively improved.
Drawings
The specification includes the following two figures:
FIG. 1 is a cross sectional view of the double-layered superposed primary arch cover structure of the urban mass transit large-span underground tunnel of the present invention;
fig. 2 is the utility model discloses urban rail transit strides secretly greatly and props up arch cover structure well first layer preliminary bracing structure and first layer preliminary bracing structure's connected mode schematic diagram in the double-deck coincide of tunnel.
The component names and corresponding labels are shown in the figure: the system comprises a first-layer primary support structure 1, a first grid steel frame 11, a first sprayed concrete layer 12, a second-layer primary support structure 2, a second grid steel frame 21, a second sprayed concrete layer 22, large arch feet 23, beard ribs 24, a locking angle anchor rod 3 and a system anchor rod 4.
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 double-deck coincide of urban rail transit stride undercut tunnel is first to prop up hunch lid structure, first layer preliminary bracing structure 1, the second floor preliminary bracing structure 2 including upper and lower coincide. The arch part of the secondary layer primary supporting structure 2 is gradually thickened from the arch top to the arch springing, the large arch springing 23 which is connected with the arch part into a whole is arranged at the end parts of two sides, the large arch springing 23 is a molded reinforced concrete longitudinal beam, the large arch springing 23 at two sides is provided with the locking angle anchor rod 3, when the arch springing is broken and develops, the locking angle anchor rod 3 can be adjusted into a grouting anchor pipe, and the integrity and stability of the arch springing can be greatly improved. The first-layer primary supporting structure 1 and the second-layer primary supporting structure 2 are connected into a whole through the connecting members to form an overlapped structure which commonly bears the vertical pressure of the stratum, and the safety of the primary arch cover can be effectively improved.
Referring to fig. 2, the first-layer preliminary bracing structure 1 includes a first sprayed concrete layer 12 and a first grid steel frame 11 buried therein, and an arch system anchor rod 4 connected with the first grid steel frame 11 is provided, or a small advanced duct is adjustable to be provided outside the first sprayed concrete layer 12 when the arch geological development breaks the soft zone. The arch of the second-layer preliminary bracing structure 2 is composed of a second shotcrete layer 22 and a second grid steel frame 21 embedded therein. The arch parts of the first-layer primary supporting structure 1 and the second-layer primary supporting structure 2 adopt a sprayed concrete layer and a grid steel frame structure, construction is convenient and fast, and rapid forming of the arch cover is facilitated and a stress system is formed.
Referring to fig. 2, the connecting member is a beard rib 24 having two ends respectively welded to the first grid steel frame 11 and the second grid steel frame 21, and the first grid steel frame 11 and the second grid steel frame 21 are fixedly connected into a whole through the beard rib 24 to form a stressed whole.
The above is only used for illustrating the basic principle of the double-layer superposed primary arch cover structure of the urban rail transit long-span undercut tunnel, not to be bound the utility model discloses a limitation is shown with concrete structure and application scope in, so all corresponding modifications and equivalents that probably are utilized all belong to the patent scope of the utility model.
Claims (4)
1. Urban rail transit strides secretly dug double-deck coincide just props hunch lid structure greatly, including upper and lower coincide first layer preliminary bracing structure (1), second floor preliminary bracing structure (2), characterized by: the arch part of the second-layer primary supporting structure (2) is gradually thickened from the arch top to the arch springing, the end parts of two sides are provided with large arch springing (23) which are connected with the arch part into a whole, the large arch springing (23) is a longitudinal beam for molding reinforced concrete, and the large arch springing (23) of the two sides are provided with locking angle anchor rods (3) or grouting anchor pipes; the first-layer primary supporting structure (1) and the second-layer primary supporting structure (2) are connected into a whole through connecting members to form an overlapped structure for bearing the vertical pressure of the stratum together.
2. The double-layer superposed primary arch cover structure of the urban rail transit long-span underground tunnel according to claim 1, which is characterized in that: the first-layer primary supporting structure (1) comprises a first sprayed concrete layer (12) and a first grid steel frame (11) buried in the first sprayed concrete layer, and arch system anchor rods (4) connected with the first grid steel frame (11) are arranged, or a small advanced guide pipe is arranged outside the first sprayed concrete layer (12).
3. The double-layer superposed primary arch cover structure of the urban rail transit long-span underground tunnel according to claim 1, which is characterized in that: the arch part of the second-layer primary supporting structure (2) is composed of a second sprayed concrete layer (22) and a second grid steel frame (21) buried in the second sprayed concrete layer.
4. The double-layer superposed primary support arch cover structure of the urban rail transit long-span underground excavation tunnel as claimed in claim 2 or 3, wherein: the connecting component is a beard rib (24) with two ends respectively welded with the first grid steel frame (11) and the second grid steel frame (21).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020831940.6U CN213269907U (en) | 2020-05-18 | 2020-05-18 | Double-layer superposed primary support arch cover structure of large-span underground excavation tunnel of urban rail transit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020831940.6U CN213269907U (en) | 2020-05-18 | 2020-05-18 | Double-layer superposed primary support arch cover structure of large-span underground excavation tunnel of urban rail transit |
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| CN213269907U true CN213269907U (en) | 2021-05-25 |
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