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Construction method for caisson at tunnel portal section

A construction method and caisson technology, which is applied in the field of caisson construction at the tunnel entrance section, can solve problems such as shortening the tunnel length, achieve the effects of shortening the tunnel length, improving construction safety, and reducing the collapse of the excavation surface

Active Publication Date: 2014-08-13
ZHONGJIAO TONGLI CONSTR
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  • Application Information

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Problems solved by technology

The caisson construction method of the tunnel entrance section solves the problem that the buried depth of the existing tunnel entrance section is shallow and difficult to form a hole, and can reduce safety accidents such as excavation surface collapse during the construction process, and provides a new foundation for the shallow buried section of the tunnel entrance. The undercut section of the main tunnel provides a transition, improving tunnel construction safety while reducing tunnel length

Method used

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  • Construction method for caisson at tunnel portal section
  • Construction method for caisson at tunnel portal section
  • Construction method for caisson at tunnel portal section

Examples

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Embodiment Construction

[0052] like figure 1 , figure 2 , image 3 and Figure 4 Shown is a caisson construction method of a tunnel opening section, which construction method comprises the following steps:

[0053] Step 1. Preparatory work before construction: construction and lofting on the upward slope 4 of the entrance of the tunnel to be constructed, and leveling the site;

[0054] Step 2. Construction of the bottom section of the caisson: set the bottom section 1 of the caisson on the upward slope 4 of the tunnel entrance to be constructed. figure 1 The direction indicated by the middle arrow) the left side wall panel-1-1, the right side wall panel-1-2, the front side wall panel-1-3 and the rear side wall panel-1 on the left side, the right side, the front side and the rear side 1-4, the left side wall plate 1-1, the right side wall plate 1-2, the front side wall plate 1-3 and the rear side wall plate 1-4 are sequentially connected to form a closed square frame 1 , the upper and lower part...

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Abstract

The invention discloses a construction method for a caisson at a tunnel portal section. The construction method comprises step 1. preparation work before construction; step 2. caisson bottom section construction; step 3. caisson middle section construction; step 4. caisson top section construction; step 5. caisson bottom sealing treatment; step 6. upper part treatment inside the caisson top section; step 7. caisson communication to exterior of the tunnel portal section. The construction method for the caisson at the tunnel portal section aims at the problem that the tunnel can not be easily formed as the buried depth in the conventional construction of the tunnel portal section is small, and the new construction method of the tunnel portal section is provided, so that safety accidents such as collapse of an excavation surface during construction are reduced, transition from a shallowly-buried section of the tunnel portal to an underground excavation of a main tunnel is provided, the tunnel construction safety is improved and meanwhile the tunnel length is shortened.

Description

technical field [0001] The invention relates to a construction method for a tunnel entrance section, in particular to a caisson construction method for a tunnel entrance section. Background technique [0002] The tunnel entrance is the key section in the tunnel construction, and it is also the most difficult section. The tunnel entrance section is generally located on a slope that is severely eroded by surface water and has developed weathered cracks. It is difficult for the soil to form a load-bearing arch, so the surface slope of the upside slope at the entrance of the cave is easy to be cracked by tension and invaded by surface water, and its stability is difficult to guarantee. A large number of engineering examples at home and abroad have proved that the surrounding rock of the tunnel entrance section with a shallow covering layer is difficult to form an arch. At the same time, most of them are accompanied by special problems such as terrain bias, weak surface deposits,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D23/00E02D23/08
Inventor 蒲广宁
Owner ZHONGJIAO TONGLI CONSTR
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