Reinforcing method for processing excessive deformation of primary support in tunnel construction
A technology for primary support and tunnel construction, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as time-consuming, labor-intensive and material-consuming, potential safety hazards, disturbance of tunnel surrounding rocks, etc., to improve durability, safety, good compactness
Active Publication Date: 2011-09-14
HUNAN PROVINCIAL COMM PLANNING SURVEY & DESIGN INST CO LTD
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Problems solved by technology
Before dismantling the steel arches of the supporting structure, it is generally necessary to grout the surrounding rock mass, and in order to avoid excessive disturbance of the tunnel surrounding rocks, the steel arches need to be removed manually one by one, which is time-consuming, laborious and material-intensive. And there is a big security risk
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[0026] Such as figure 1 , figure 2 As shown, in the construction process of a certain tunnel, the support structure layer 1 of "sprayed concrete + steel arch frame" has been applied on the vault, but at the initial stage of construction, due to the excessive deformation of the support structure layer 1, and The deformation rate is too large, so the reinforcement method of the present invention will be used to deal with the excessive deformation of the initial support of the tunnel construction. The reinforcement method specifically includes the following steps:
[0027] (1) Adding steel arches: When the deformation of the support structure layer 1 is too large at the initial stage of tunnel construction, two layers of steel arch concrete structure layers are added outside the support structure layer 1 (that is, the first layer of steel arch concrete structure Layer 21 and the second layer of steel arch concrete structure layer 22), so that the steel arch concrete structure l...
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Abstract
The invention discloses a reinforcing method for processing excessive deformation of primary support in tunnel construction. The method comprises the following steps: additionally arranging a steel arch concrete structure layer at the outer side of a support structure layer to bear pressure from surrounding rock together with the primary support structure layer to form a secondary support structure layer with larger bearing capacity; mixing cement, silicon ash, wollastonite, fly ash, nano SiO2, quartz powder, quartz sand, water reducing agent and water together; sufficiently and uniformly stirring, and adding copper-plated steel fiber into the mixture to obtain high-strength powdery concrete; and finally, pouring the high-strength powder concrete at the outer side of the secondary supportstructure layer by using a lining trolley so as to form a reinforced structure layer with thickness of at least 4 cm at the outer side of the secondary support structure layer. The reinforcing methoddisclosed by the invention has simple process, good reinforcing effect and low cost, is convenient to operate, and can effectively improve the safety and economy of tunnel construction.
Description
technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a tunnel reinforcement method. Background technique [0002] In mountain tunnels or underground projects constructed by drilling and blasting method, in the tunnel body section with poor surrounding rock, the initial support deformation and deformation rate are too large during the construction process due to the fact that the actual surrounding rock does not match the design situation. In order to prevent landslides, double-layer steel arches are often used for reinforced support, that is, on the basis of the original "sprayed concrete + steel arches", an additional layer or two layers of "sprayed concrete + steel arches" are added to the outer layer. structure to maintain the initial stability of the surrounding rock. Since the newly added support structure layer encroached on the originally designed secondary lining position, the secondary lining struc...
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Login to View More IPC IPC(8): E21D11/10E21D11/18
Inventor 蒋正华戴伟傅立新易震宇侯兴杰黄谋昭罗波符飞跃荆冰寅敬瑾刘经永
Owner HUNAN PROVINCIAL COMM PLANNING SURVEY & DESIGN INST CO LTD