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Construction method of urban tunnel branching port with box type top plate structure

A construction method and bifurcation technology, applied in mine/tunnel ventilation, tunnel, tunnel lining, etc., can solve problems such as ineffective reduction of covering soil thickness, large roof thickness and unreasonable structural form, etc. Achieve the effects of reducing the amount of ordinary steel bars, less construction difficulty, and easy design

Active Publication Date: 2019-08-16
HENAN PROVINCIAL COMM PLANNING & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under normal circumstances, the cross-sectional span of the urban tunnel structure at the bifurcation will gradually increase, the plane shape is complex and irregular, and the design and construction are very cumbersome
At present, the roof of urban tunnel bifurcation is mostly in the form of flat plate structure, and its structural design is controlled by crack resistance design. The thickness of the roof is generally large and the amount of reinforcement is also large, so the economy is poor; further, when the buried depth of the tunnel structure roof When it is larger, it cannot effectively reduce the covering soil thickness
If it is designed as an arched roof structure or a folded roof structure, the shape of the roof is neither symmetrical nor regular, the structural form is not reasonable, and the construction is even more inconvenient

Method used

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  • Construction method of urban tunnel branching port with box type top plate structure
  • Construction method of urban tunnel branching port with box type top plate structure
  • Construction method of urban tunnel branching port with box type top plate structure

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Such as Figure 1-6 The shown single-hole urban tunnel with a bifurcation consists of a bottom plate 10, a side wall 1 and a box-shaped roof according to the present invention. Specifically, the above-mentioned tunnel box-shaped roof includes an upper plate 2 and a lower plate 3 arranged at intervals, and the upper plate 2, the lower plate 3 and the tunnel side wall 1 enclose a cavity that extends longitudinally along the tunnel and whose cross section gradually increases; The end with the smaller cross-section of the cavity is provided with a main port end plate 4.1, and the other end is provided with a side beam 5, and according to the design requirements, two branch end plates 4.2 and 4.3 are extended outside the side beam 5, and the inside of the cavity is passed through The web 6 is divided into a plurality of chambers S arranged longitudinally. Formwork removal holes 7 are reserved on the upper plate 2 of each box room S, and waterproof mortar is used for the low...

Embodiment 2

[0044] In order to further improve the durability of the structural roof, reduce the amount of concrete and steel bars on the structural roof, and increase the span of the urban tunnel section to a greater extent, prestress can be set on the web 6 of the above-mentioned box-shaped roof, that is, on the web 6 The corrugated pipe channel is pre-embedded along the transverse direction of the tunnel, and the prestressed steel strand steel bundle 9 is penetrated in the corrugated pipe channel for prestressed tension.

[0045] Concrete construction steps are compared with embodiment 1, and difference is only in:

[0046] After the construction of the fourth step is completed, the corrugated pipe tunnel arranged along the transverse direction of the tunnel is pre-embedded in the web 6, and the prestressed steel strand steel bundle 9 is penetrated in the corrugated pipe tunnel; after that, when the concrete poured in the seventh step reaches After the design strength, tension and anch...

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Abstract

The invention discloses a construction method of an urban tunnel branching port with a box type top plate structure. A box type top plate comprises upper plates and lower plates which are arranged between the side walls of a tunnel at intervals, wherein main port end plates are arranged at one ends of cavities enclosed by the upper plates, lower plates and the side walls of the tunnel, and branching port structures are formed by the other ends of the cavities through side beams and outer branching port end plates. The interiors of the cavities are divided by webs into a plurality of boxes arranged in the longitudinal direction, mould removing holes are formed in the upper plates of the boxes, and ventilation drainage holes are formed in the lower plates of the boxes by using waterproof mortar to find the slope. The construction method mainly comprises the steps that foundation pits are excavated; concrete is poured on tunnel bottom plates, side walls and embedded columns of branching ports; concrete is poured on the lower plates, the webs, the side beams, the main port end plates, the branching port end plates and the upper plates; and finally a waterproof layer is arranged, and the backfilling of covering soil is carried out. According to the construction method, the self-weight of the structural top plates can be reduced, the thickness of the covering soil of the structural top plates is reduced, loads on the structure are reduced, and the span of an urban tunnel section is increased.

Description

technical field [0001] The invention relates to the technical field of municipal engineering urban tunnel structure design and construction, in particular to a construction method for an urban tunnel bifurcation with a box-shaped roof structure. Background technique [0002] With the development of urban tunnel construction, its functional requirements are getting higher and higher. In most cases, urban tunnels only need to meet the traffic demand in one direction, but sometimes it is necessary to consider the diversion and connection of traffic in multiple directions. Under normal circumstances, the cross-sectional span of the urban tunnel structure at the bifurcation will gradually increase, the plane shape is complex and irregular, and the design and construction are very cumbersome. At present, the roof of urban tunnel bifurcation is mostly in the form of flat plate structure, and its structural design is controlled by crack resistance design. The thickness of the roof ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21F1/00E21F16/02E21D9/00E21D11/38
CPCE21D9/00E21D11/003E21D11/10E21D11/38E21F1/003E21F16/02
Inventor 付大喜郭炎伟阮锦楼李曙光靳正付赵乐乐胡晓伟曹文文赵慧勇兰伟伟张永刚李浩彬徐飞元
Owner HENAN PROVINCIAL COMM PLANNING & DESIGN INST CO LTD
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