Rapid Demolition Method of Expressway Arch Overpass by Controlled Blasting

A flyover and controlled blasting technology, which is applied in the field of construction and civil engineering, can solve the problems of temporarily closed traffic or long time for temporary rerouting, incomplete application of arched flyovers, and long construction time, etc., so as to save demolition time, The effect of short demolition time and reduced construction period

Active Publication Date: 2016-05-04
中交一公局第五工程有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method is only applicable to flyover bridges with slanted-leg steel structures and simply supported hollow slab structures, and is not fully applicable to arched flyover bridges, and there are problems such as long construction time, long time for temporary traffic closure or temporary rerouting, and safety issues. high risk etc.

Method used

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  • Rapid Demolition Method of Expressway Arch Overpass by Controlled Blasting
  • Rapid Demolition Method of Expressway Arch Overpass by Controlled Blasting
  • Rapid Demolition Method of Expressway Arch Overpass by Controlled Blasting

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Embodiment 1

[0069] Aiming at the structural stress characteristics of the arch-type flyover bridge, the invention proposes a construction technique for safe and quick removal of the arch-type flyover bridge during expressway reconstruction and expansion, so as to ensure rapid recovery of road traffic.

[0070] Concretely, the rapid demolition method of the expressway arch type overpass by controlled blasting, such as Image 6 shown, including the following steps:

[0071] Step 1, design blasting construction scheme, including: design blasting parameters, design blasting network and design blasting safety protection measures;

[0072] In addition, it should be noted that since arch flyovers include arch flyovers without support connecting members and arch flyovers with support connecting members, so, for the category of arch flyovers, in When designing the blasting construction scheme, the parameters involved are slightly deviated, but the principles of the two are basically the same. Am...

Embodiment 2

[0123] Reconstruction and expansion project of Beijing-Hong Kong-Macao Expressway from Zhumadian to Xinyang section, K102+226 overhead arch bridge, bridge length 56.88m, bridge deck width 5m (including the width of both sides of the guardrail), net width 4m, bridge deck height 5.5m from the ground , the thickness of the bridge deck is 60cm, the thickness of the arch frame is 80cm, and the thickness of the longitudinal support wall is 30cm. The bridge was blasted using this plan on January 6, 2015. The specific process is as follows:

[0124] 1. Blasting design

[0125] (1) Design of blasting parameters

[0126] Blasting incisions: Drill and blast incisions at both ends of the arch near the arch surface of the abutment, the longitudinal support wall, and the bridge deck, so that the main body collapses downward after blasting. Among them, the longitudinal support blasting cut has two functions: on the one hand, it is used to destroy the supporting effect of the arch frame on ...

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Abstract

The invention provides a rapid controlled blasting demolition method for an arch-shaped highway over-line bridge. The rapid controlled blasting demolition method comprises the following steps that a blasting construction scheme is designed; blast holes are deployed and controlled; the traffic is closed, and road surface protection is performed; blasting powder is loaded, and leads are connected; safety alerting is performed; detonation is performed; a bridge body is separated by cutting; road surface clearing is performed. The rapid controlled blasting demolition method has the advantages that most work (for instance, blast hole deploy and control) of demolition construction is performed under the condition of normal vehicle traffic, the demolition time is saved, the speed is high, and lines can keep unobstructed; as disintegration is relatively sufficient after the bridge body collapses, the demolition time is short; during blasting demolition, all components are broken and deform synchronously, and the collapse range is concentrated; long-distance detonation control is performed, so safety is good; from traffic closing to traffic restoration, it usually takes 6-8 hours, management is facilitated, blasting demolition of multiple overbridges of the whole line can be achieved at the same time, and the construction period can be effectively shortened.

Description

technical field [0001] The invention belongs to the technical field of architecture and civil engineering, and in particular relates to a controlled blasting rapid demolition method for an arch-type overpass bridge of an expressway. Background technique [0002] With the development of our country's economy and the progress of society, the original expressway can no longer meet the development requirements of the existing economy, and its traffic flow and load have greatly exceeded the original design requirements. Some highways are designed to be widened and expanded, so as to improve their traffic flow and use functions. [0003] In the process of expressway widening and expansion, the overpass designed on the original expressway must be demolished. The main structural forms of flyover bridges include continuous rigid frame, rigid frame with oblique legs, simply supported hollow slab, cast-in-place continuous beam and arch bridge, etc. Since different types of flyover bri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D3/00F42D1/00E01D24/00
Inventor 隆海健马骏赵伟麻瑞昇郭柯心
Owner 中交一公局第五工程有限公司
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