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An initial support and assembled technology, which is applied in the direction of tunnels, tunnel linings, shaft equipment, etc., to achieve the effects of wide application range, guaranteed construction quality, and shortened operation time
Active Publication Date: 2018-10-09
CHINA RAILWAY 24TH BUREAU GRP ZHEJIANG ENG CO LTD
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Problems solved by technology
[0003] The purpose of the present invention is to solve the initial support of tunnels and underground works excavated by the mining method, especially when there is no or cannot use the shield method for construction, the problem of effective support of the project in the special section with relatively weak and broken geology, and to provide A Tunnel Assembled Primary Support Method with Reasonable Structure, High Efficiency and Safe Construction
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Embodiment 1
[0035] Embodiment one, such as figure 1 As shown, for small-section tunnels, integral support is adopted, that is, one-time excavation and one-time support forming. M in the figure is the surrounding rock around the tunnel, the same below, and the specific method is:
[0036] 1. Measurement and stakeout: measure the excavation contour line according to the design section.
[0037] 2. Excavation: Weak surrounding rocks shall be excavated by excavators, and relatively hard surrounding rocks shall be excavated by loose blasting. The excavation at one time is preferably 50-80cm.
[0038] 3. Excavating ballast, cleaning and leveling the excavation surface.
[0039]4. Assemble the support components according to the diagram, including 9 common support components 1 and 1 adjustment block 2 on the top. All the support components are connected by bolts to form a whole.
[0040] 5. Back grouting filling.
[0041] 6. Remove the temporary support.
Embodiment 2
[0042] Embodiment 2, for a large section, partial excavation support is adopted, that is, the partial excavation is respectively formed into a ring, and the overall connection is carried out according to the following steps, with the centerline of the tunnel section width as the Y axis and the midpoint of the tunnel height as the origin, The horizontal line is the X-axis, and the rectangular coordinates of the plane are set:
[0043] 1. Excavate area A of the second quadrant, such as figure 2 As shown, carry out initial support and use channel steel, screw steel and other profiles or synthetic support rods for temporary locking. The specific methods are:
[0044] ① Measurement and stakeout: measure the excavation contour line according to the design section.
[0045] ②Excavation: The weak surrounding rock shall be excavated by an excavator, and the relatively hard surrounding rock shall be excavated by loosening blasting, with a excavation length of 60cm.
[0046] ③Ballasti...
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Abstract
The invention relates to a splicing-type primary support method for a tunnel. Therefore, constructions in special sections of weak geological conditions can be effectively supported when a shield method for construction is not adopted for tunnels excavated by a mining method and primary support of underground construction. The splicing-type primary support method comprises an overall support and partial excavation support and is characterized in that based on a tunnel section form, a support member is divided into multiple blocks; on the site, the multiple blocks are attached to the excavation surface for splicing into a ring so that surrounding rock deformation is controlled; in the method of partial excavation support, rings are formed by partial excavation so that overall connection is formed. The surrounding rocks are supported timely and deformation is controlled. The working environment is improved. The primary support time is shortened and safety coefficients of the working surface construction are improved. Stress is more uniform. The construction quality of a water-proof layer is ensured. Mechanical installation is achieved and high efficiency is obtained. The splicing-type primary support method is used more flexible and has a broad application scope. The support cost is low.
Description
technical field [0001] The invention relates to the technical field of urban tunnels and underground engineering, in particular to an assembled primary support method for tunnels. Background technique [0002] The excavation of the tunnel destroys the initial stress balance of the stratum, resulting in the stress release of the surrounding rock and the deformation of the cavern. The weak surrounding rock has a low self-supporting capacity, and the deformation is more prominent. In order to control the stress release and deformation of the surrounding rock, increase the structural Safety and construction safety, the initial support is carried out immediately around the cavern after excavation, to provide resistance to the surrounding of the cavern, and to control the deformation of the surrounding rock. There are many primary support methods in the prior art, each of which has different characteristics and adaptability in process and effect. For example, the patent publicati...
Claims
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Application Information
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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D11/08E21D11/10
CPCE21D9/00E21D9/006E21D11/08E21D11/105
Inventor 任文祥
Owner CHINA RAILWAY 24TH BUREAU GRP ZHEJIANG ENG CO LTD
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