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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: 2012-09-26
ZHONGJIAO TONGLI CONSTR
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 A caisson construction method for a tunnel entrance section shown, the construction method includes the following steps:

[0053] Step 1. Preparatory work before construction: construct stakeout on the slope 4 of the tunnel opening to be constructed, and level the site;

[0054] Step 2, caisson bottom section construction: set the caisson bottom section 1 on the incline 4 of the tunnel opening to be constructed, and the caisson bottom section 1 comprises a figure 1 The direction indicated by the middle arrow) left side wall panel-1-1, right side panel-1-2, front side wall panel-1-3 and rear side wall panel-1 on the left side, right side, front side and rear side 1-4, the left side wall board-1-1, the right side wall board-1-2, the front side wall board-1-3 and the rear side wall board-1-4 are connected in sequence to form a closed frame 1 , the upper part and the lower part of the frame one are all openings, and th...

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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 of a tunnel entrance section, in particular to a caisson construction method of 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 the slope surface that is severely eroded by surface water and has developed weathered fissures. In addition, the tunnel burial depth in the tunnel entrance section is often shallow, and the upper part of the structure is rocky. It is difficult for the soil to form a load-bearing arch, so the slope surface of the inverted slope at the entrance is easily 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 opening section with shallow cover is difficult to form arch...

Claims

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Application Information

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IPC IPC(8): E02D23/00E02D23/08
Inventor 蒲广宁
Owner ZHONGJIAO TONGLI CONSTR
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