Shock-absorbing method of ring-shaped layered blasting for shallow-buried large-section tunnel passing through existing buildings

A technology with existing buildings and large sections, applied in the line field, can solve problems such as loss, people's lives and property threats, and achieve the effect of reducing vibration speed and avoiding construction disturbance

Inactive Publication Date: 2016-12-07
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Slightly improper handling of these issues will not only bring great threats and losses to the lives and properties of the people, but also bring great negative social impact

Method used

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  • Shock-absorbing method of ring-shaped layered blasting for shallow-buried large-section tunnel passing through existing buildings
  • Shock-absorbing method of ring-shaped layered blasting for shallow-buried large-section tunnel passing through existing buildings
  • Shock-absorbing method of ring-shaped layered blasting for shallow-buried large-section tunnel passing through existing buildings

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Embodiment Construction

[0017] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] The technical method of the present invention is made up of three major contents. The first part is the shock-absorbing system—the shock-absorbing large tube shed and the shock-absorbing small conduit; the second part is the controlled blasting excavation system—the empty hole is equipped with wedge-shaped cutting blasting, expanding holes, auxiliary holes and peripheral holes. Layer and segmental blasting excavation; the third part is the layered and segmented blasting system of the middle and lower steps, such as figure 1 shown.

[0019] A shock-absorbing method for ring-shaped layered blasting in which a shallow-buried large-section tunnel passes under an existing building, comprising the following steps:

[0020] 1) Firstly, steel pipes with a spacing of 40cm and a diameter of 108mm are drilled within the...

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Abstract

The invention discloses an annular layering blasting shock absorption method for a shallowly-buried large-section tunnel to pass underneath an existing building. Steel pipes with the separation distance of 40 cm and the diameter of 108 mm are arranged in an arch portion of the tunnel within the range of 120 degrees to 150 degrees in a driving mode, the length of the steel pipes are controlled to be 10 m to 30 m, and the angle of the steel pipes should not be larger than 3 degrees to 5 degrees; a small guide pipe with the separation distance of 40 cm and the diameter of 42 mm is arranged between every two large pipe sheds in a driving mode, the length of the small guide pipes is controlled to be 3 m to 5 m, and the angle of the small guide pipes should not be larger than 3 degrees to 5 degrees; grouting of the large pipe sheds and the small guide pipes is carried out after the tunnel passes the segment smoothly in an excavation mode; an upper step of the tunnel is transversely grooved in a wedged mode; annular layering blasting excavation is carried out on cut spreader holes, and detonators on different levels are used for blasting in different areas; auxiliary holes and peripheral holes in the upper step of the tunnel are also excavated through annular layering and segmented blasting; a middle step and a lower step of the tunnel are blasted and excavated vertically along with layers and segments. According to the annular layering blasting shock absorption method for the shallowly-buried large-section tunnel to pass underneath the existing building, harm caused by tunnel blasting can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of line technology, in particular to an annular layered blasting shock absorption method for a shallow-buried large-section tunnel passing through an existing building. Background technique [0002] As a node project in the line engineering, the tunnel construction has great variability due to the difference in terrain and landform. Just because of these reasons, there will be many unpredictable difficulties and dangers in the construction project of the interchange tunnel in mountainous towns, such as: the upper span between the new tunnel and the existing tunnel and the existing building (structure) The blasting construction during the construction, under-passing and close-distance construction is a difficult problem, which has always puzzled engineers and technicians. How to reduce the vibration impact of blasting construction on nearby existing buildings (structures), and what effective shock-absorbing measures t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D1/00F42D1/08F42D3/00
Inventor 牛泽林宋战平黄捷胜王超李俊林
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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