A Construction Method of Diagonal Orthogonal Construction Using Bias Pressure Entry

A technology of oblique normal construction and construction method, which is applied in excavation, earthwork drilling, foundation structure engineering, etc., to achieve the effects of reduced excavation volume, short construction period and controllable quality

CN111271066BActive Publication Date: 2021-08-31POWERCHINA HUADONG ENG COPORATION LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-08-31

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Abstract

The invention belongs to an oblique frontal construction method for tunnel entry with bias pressure, which refers to that the excavation of the tunnel surface is basically parallel to the contour line of the tunnel entrance, obliquely intersected with the tunnel axis, and closely adheres to the tunnel surface in combination with the trend of the mountain body when entering the tunnel. Construction of oblique arches, steel arches are erected one by one perpendicular to the tunnel axis, and an open hole is made outside the arches and backfilled. The construction method of the invention can ensure the safe and smooth entry of tunnels with good geological conditions and shallow buried bias terrain conditions, can greatly reduce the excavation volume of the mountain, fully embodies the concept of harmonious development between man and nature, and has the advantages of simple method Practical, low construction cost, short construction period, safe and reliable, and quality controllable.
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Description

technical field

[0001] The invention belongs to an oblique positive construction method of bias pressure entry into a hole. Background technique

[0002] In the process of highway construction, the route selection will inevitably pass through steep mountains. When tunnels are built at these positions, the opening of the tunnel is likely to be biased. In the prior art, when constructing a tunnel under biased pressure, for a steep entrance with good geological conditions, an oblique and orthogonal construction method is often used to reduce the excavation of side and uphill slopes.

[0003] At present, there are two commonly used construction methods for tunnel arches: one is to use the method of erecting conventional steel arches with left and right dislocations, that is, the erection direction of the steel arches is 45° to the axis of the tunnel. ° ~ 60° angle installation, the steel arches on both sides are erected with the method of "dense outside and sparse inside", and ...

Examples

Embodiment Construction

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0034] If no specific technique or condition is indicated in the examples, it shall be carried out according to the technique or condition described in the literature in this field or according to the product specification. The products used are those whose manufacturers are not indicated, and they are all conventional products that can be obtained through purchase.

[0035] The oblique construction method of the bias pressure tunnel of the present invention comprises the following steps:

[0036] Construction of intercepting ditches → excavation protection at the entrance section → thrust pier construction → oblique arch construction → advance support drillin...