CN216198163U - Ring beam structure for primary support of large-span dome cavern - Google Patents
Ring beam structure for primary support of large-span dome cavern Download PDFInfo
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- CN216198163U CN216198163U CN202122650450.3U CN202122650450U CN216198163U CN 216198163 U CN216198163 U CN 216198163U CN 202122650450 U CN202122650450 U CN 202122650450U CN 216198163 U CN216198163 U CN 216198163U
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Abstract
The utility model provides a circle roof beam structure for large-span dome cavern preliminary bracing, includes I-shaped steel circle roof beam (2) that assemble, dome steel bow member (3), vertical wall support steelframe (6), prestressed anchorage pole (1) and long stock (7). The prestressed anchor rods are arranged in a quincunx shape, the length of each prestressed anchor rod is 4m and 5m, the longitudinal distance between the rings is 1m x 1m, and the prestressed anchor rods are arranged at the arch crown and the side wall. According to the utility model, the arch foot ring beam is arranged to connect the supporting structures of the whole dome cavern into a whole, so that the integrity of the dome supporting structure is improved, the possibility of collapse and block falling caused by poor local surrounding rock mass is reduced, the bearing capacity of the arch foot is improved, the self-bearing capacity of the surrounding rock is fully exerted, and the horizontal and vertical loads transferred by the dome arch frame can be better borne; the utility model has simple construction process and lower investment cost, and can be used as a supporting structure for underground cavern excavation in various industries such as civil engineering, water and electricity, energy storage and the like.
Description
Technical Field
The utility model relates to a ring beam structure for primary support of a large-span dome cavern, and belongs to the technical field of supporting structures of tunnels and underground engineering.
Background
In industries such as civil engineering, hydroelectric engineering, mining, energy storage and scientific research, the cylindrical dome cavern structure has better stability of the surrounding rocks of the dome due to the structural characteristics of the pressure-bearing arch, so that the cylindrical dome cavern structure is increasingly applied to various projects. However, along with the development of the society, the excavation span of the underground cavern is increasingly large, the large-span excavation can lead to the enlargement of the loosening ring range of the upper rock body, the vault is easy to collapse and the block falls, and meanwhile, the large-span excavation can inevitably meet the unfavorable geological conditions of cracks, joints and the like. The existing large-span supporting structure does not consider the supporting of the unstable blocks, and cannot ensure that the low-grade part of the surrounding rock has enough bearing capacity; therefore, in order to improve the integrity and stability of the excavated dome cavern and reduce the influence of local unfavorable geological conditions on the construction and later use of the dome cavern, the utility model provides a supporting structure which has good integrity and can fully utilize the self-bearing capacity of a rock mass.
The existing supporting structure generally adopts the form of a prestressed anchor rod, a steel frame net, a grid steel frame and a temporary support, the grid steel frame transmits the force of dome surrounding rock to a dome arch springing, and the dome arch springing generates a stress concentration phenomenon, so that the dome springing is easily damaged, and therefore, the force transmitted to the dome springing by a dome needs to be reduced and the self-bearing capacity of the dome springing needs to be improved.
Disclosure of Invention
The utility model aims to disclose a ring beam structure for primary support of a large-span dome cavern, aiming at the problems of low surrounding rock grade and difficult large-span excavation support of the dome cavern.
The technical scheme includes that the ring beam structure is used for primary support of a large-span dome cavern and comprises a prestressed anchor rod, an I-shaped steel ring beam, a dome steel arch frame and a vertical wall supporting steel frame; the I-shaped steel ring beam surrounds the periphery of the tunnel, is partially embedded in the arch springing surrounding rock, and is partially supported on the vertical wall supporting steel frame; a circle of long anchor rods are arranged around the hole of the I-shaped steel ring beam; the dome steel arch is connected with the I-shaped steel ring beam; one end of each prestressed anchor rod is fixed on the steel arch frame of the dome, the other end of each prestressed anchor rod is arranged on the dome and the side wall of the cavern, and all the prestressed anchor rods are uniformly arranged in a quincunx shape at intervals.
The length of the prestressed anchor rod is 4 m-5 m, the longitudinal distance between the arranged rings is 1m multiplied by 1m, and the crack development part can be properly encrypted; the prestressed anchor rod adopts a mechanical shell-expanding prestressed anchor rod.
The long anchor rod is characterized in that an I-shaped steel ring beam is embedded and fixed in the arch springing surrounding rock, the length of the anchor rod is 6m, and the circumferential distance of the anchor rod is 1 m.
The ring direction of the I-shaped steel ring beam is connected with the ring direction of the I-shaped steel ring beam through a second connecting bolt; the I-shaped steel ring beam is connected with the dome steel arch frame through a first connecting bolt.
The strength grades of the primary lining and the secondary lining of the dome steel arch frame and the side wall are C25; and after the I-shaped steel ring beam is installed, the sprayed concrete is C35 concrete with higher strength grade.
The utility model has the beneficial effects that the supporting structure combining the anchor rods and the dome steel arch frames is adopted, and the I-shaped steel ring beam is arranged to connect the supporting system of the whole dome cavern into a whole, so that the integrity of the dome cavern is improved, and the engineering accidents of local collapse, block falling and the like caused by low local surrounding rock strength level can be effectively avoided; the I-shaped steel ring beam can effectively improve the bearing capacity of the arch springing, uniformly transmits the horizontal component of the stress of the surrounding rock to the surrounding rock around the dome cavern, and simultaneously, the I-shaped steel ring beam is connected with the straight wall supporting steel frame, can transmit a part of the vertical component of the stress of the surrounding rock to the bottom rock mass of the dome cavern, reduces the vertical stress borne by the side wall, and effectively prevents the side wall from rib fracture. The dome surrounding rock and the side wall surrounding rock are reinforced by the mechanical expanding shell prestressed anchor rods, and the self-bearing capacity of the surrounding rock can be exerted to the maximum extent.
The utility model has simple construction process and lower investment cost, and can be used as a supporting structure for underground cavern excavation in various industries such as civil engineering, water and electricity, energy storage and the like.
Drawings
FIG. 1 is a layout of the overall support of the present invention;
FIG. 2 is a side wall anchor bar layout of the present invention;
FIG. 3 is a large drawing of the arrangement A of the arch springing I-shaped steel ring beam of the utility model;
FIG. 4 is a schematic view of the connection of the steel arch and the ring beam according to the present invention;
FIG. 5 is a schematic view of the circumferential connection of I-shaped steel ring beams according to the present invention;
FIG. 6 is a plan view of an I-shaped steel ring beam of the present invention;
in the figure, 1 is a prestressed anchor rod; 2 is an I-shaped steel ring beam; 3 is a dome steel arch frame; 4 is a first connecting bolt; 5 is a second connecting bolt; 6, a vertical wall supporting steel frame; and 7, a long anchor rod.
Detailed Description
Fig. 1-5 are schematic diagrams of the structure and arrangement of the components of the present invention.
As shown in figure 1, after the upper tunnel is excavated to the position of the arch foot of the tank room, the 14-door steel frame is adopted to gradually raise and excavate, after the excavation is finished, concrete with the thickness of 15mm is initially sprayed for leveling immediately, and then a mechanical shell-expanding prestressed anchor rod (1), a vault steel arch (3) and a reinforcing mesh are arranged one by one under the protection of the door-type steel frame.
As shown in figure 2, the longitudinal arrangement distance of the rings of the mechanical expanding shell prestressed anchor rods (1) is 1m multiplied by 1m, the length is 3m and 5m, and the rings are arranged at intervals in a quincunx shape. FIG. 3 is a plan layout view of an I-shaped steel ring beam (2), the I-shaped steel ring beam (2) shown in FIG. 3 is arranged at the arch springing of a dome cavern and is embedded and fixed on rock around the cavern through a circle of anchor rods (7) with the length of 6 m; in addition, the I-shaped steel ring beam (2) is not only connected with the dome steel arch frame (3), but also connected with the straight wall supporting steel frame (6), so that part of the vertical component of the stress of the surrounding rock can be transmitted to the bottom surrounding rock through the straight wall supporting steel frame (6), and the side wall is prevented from being damaged by rib stripping.
Fig. 4 and 5 show the connection mode between the i-shaped steel ring beam (2) and the dome steel arch (3), and as shown in fig. 4 and 5, the i-shaped steel beam (2) and the i-shaped steel ring beam (2) are connected in the circumferential direction through a second connecting bolt; the I-shaped steel ring beam (2) and the dome steel arch frame (3) are connected through a first connecting bolt; the I-shaped steel ring beam (2) is made of Q235 steel, and after the whole I-shaped steel ring beam (2) is assembled, the I-shaped steel ring beam (2) is protected by concrete with the spraying strength grade of C35.
The concrete construction steps of the embodiment are as follows:
(1) the construction method of dividing angles and dividing sectors is adopted to carry out gradual excavation, the central angle of each sector is 18 degrees, concrete with the strength grade of C25 is sprayed immediately for leveling once each sector is excavated, and the thickness of the sprayed concrete is 15 mm.
(2) After concrete leveling, a first layer of reinforcing mesh is laid, mechanical expanding shell prestressed anchor rods are arranged for fixing, the length of each prestressed anchor rod is 3m and 5m, the ring longitudinal distance is 1m multiplied by 1m, and the prestressed anchor rods are arranged at intervals in a quincunx shape. And then installing dome steel arch frames one by one.
(3) And annular I-shaped steel ring beams corresponding to the excavation area are assembled on the outer ring of the tank body cavity and are fixed by arranging anchor rods with the length of 6m, and the I-shaped steel ring beams and the dome steel arch frame are connected together through bolts. The diameter of the bolt is 40 mm.
(4) Excavating and supporting each sector area according to the steps (1), (2) and (3), and spraying concrete with the strength grade of C35 to the I-shaped steel ring beam after the I-shaped steel ring beam is integrally assembled and formed.
Claims (5)
1. A ring beam structure for primary support of a large-span dome cavern is characterized by comprising a prestressed anchor rod, an I-shaped steel ring beam, a dome steel arch frame and a straight wall supporting steel frame; the I-shaped steel ring beam surrounds the periphery of the tunnel, is partially embedded in the arch springing surrounding rock, and is partially supported on the vertical wall supporting steel frame; a circle of long anchor rods are arranged around the hole of the I-shaped steel ring beam; the dome steel arch is connected with the I-shaped steel ring beam; one end of each prestressed anchor rod is fixed on the steel arch frame of the dome, the other end of each prestressed anchor rod is arranged on the dome and the side wall of the cavern, and all the prestressed anchor rods are uniformly arranged in a quincunx shape at intervals.
2. The ring beam structure for the primary support of the large-span dome cavern as claimed in claim 1, wherein the length of the prestressed anchor rod is 4 m-5 m, the longitudinal distance between the arranged rings is 1m x 1m, and the crack development part can be properly encrypted; the prestressed anchor rod adopts a mechanical shell-expanding prestressed anchor rod.
3. The ring beam structure for the primary support of the large-span dome cavern as recited in claim 1, wherein the long anchor rods are used for embedding the I-shaped steel ring beam in the arch foot surrounding rock, the length of each anchor rod is 6m, and the circumferential distance between the anchor rods is 1 m.
4. The ring beam structure for the primary support of the large-span dome cavern as claimed in claim 1, wherein the I-shaped steel ring beam is connected with the ring direction of the I-shaped steel ring beam through a second connecting bolt; the I-shaped steel ring beam is connected with the dome steel arch frame through a first connecting bolt.
5. The ring beam structure for the primary support of the large-span dome cavern according to claim 1, wherein the strength grade of the primary lining and the secondary lining of the steel arch and the side wall of the dome is C25; and after the I-shaped steel ring beam is installed, the sprayed concrete is C35 concrete with higher strength grade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122650450.3U CN216198163U (en) | 2021-11-02 | 2021-11-02 | Ring beam structure for primary support of large-span dome cavern |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122650450.3U CN216198163U (en) | 2021-11-02 | 2021-11-02 | Ring beam structure for primary support of large-span dome cavern |
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| Publication Number | Publication Date |
|---|---|
| CN216198163U true CN216198163U (en) | 2022-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122650450.3U Active CN216198163U (en) | 2021-11-02 | 2021-11-02 | Ring beam structure for primary support of large-span dome cavern |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216198163U (en) |
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2021
- 2021-11-02 CN CN202122650450.3U patent/CN216198163U/en active Active
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