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Underwater grouting grout based on soft-base large immersed tunnel foundation and grouting process thereof

An immersed tube tunnel and foundation technology, applied in the field of large-scale immersed tube tunnel foundation groove grouting technology, can solve the problems of high cost, high risk, complex construction technology, etc., achieve good seismic performance, reduce launching operations, and advanced grouting technology Effect

Active Publication Date: 2015-01-07
CHINA RAILWAY 18TH BUREAU GRP CO LTD +6
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In terms of construction safety, cost, and convenience, the conventional pile foundation method, scraping method, and bladder filling method all require large-scale mechanical ships and divers to complete the operation. The construction process is complicated, the cost is high, and the risk is high.

Method used

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  • Underwater grouting grout based on soft-base large immersed tunnel foundation and grouting process thereof
  • Underwater grouting grout based on soft-base large immersed tunnel foundation and grouting process thereof
  • Underwater grouting grout based on soft-base large immersed tunnel foundation and grouting process thereof

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Embodiment Construction

[0035] The details of the present invention are described below through the examples, and the examples are provided for the convenience of understanding, and are by no means limiting the present invention.

[0036] research material:

[0037] The Haihe Tunnel project involved in the embodiment is located in Tanggu District, Tianjin City, near the port area of ​​Bohai Bay, and its geology belongs to the coastal soft soil geological layer, and it is located in the North China seismic zone. The foundation groove of the immersed tunnel adopts pressure grouting method for foundation treatment, the main purpose is to fill the gap between the bottom of the pipe and the base, to ensure uniform stress on the structure and base, and to reduce uneven settlement. The foundation grouting treatment is carried out under 22 meters of water. The construction conditions are poor, the operation is very difficult, and the quality requirements are high. The stability of the foundation directly aff...

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Abstract

The invention discloses a preparation of underwater grouting grout based on soft-base large immersed tunnel foundation and a grouting process thereof. The foundation is formed by a 60-cm thick macadam foundation base and a 40-cm thick sodium bentonite mortar foundation and is capable of meeting requirements for tunnel foundation rigidity and requirements for base seismic resistance and water flow scouring resistance. The grout is composed of cement, fine sand, coal ash and sodium bentonite. The grouting process is improved, and pipe inside grouting of embedded grouting holes is adopted. Therefore, large ships are not required to work on river face, underwater operation of divers and navigation risks are reduced, construction safety is greatly improved, and construction cost is reduced. The secondary grouting technology is first adopted in the field of the immersed tunnel to reduce uneven sedimentation in future operation stage of projects. The grouting process provides a reference guide and an experience guide for large dock projects, immersed tunnel projects, municipal administration soft earth foundation strengthening projects, high earthquake region basic project design and other similar projects.

Description

technical field [0001] The invention relates to a large-scale immersed tunnel foundation groove grouting process, in particular to an underwater grouting technology for a large-scale immersed tunnel foundation groove based on coastal soft foundation. Background technique [0002] From a mechanical point of view, the foundation of immersed tube tunnels is usually subjected to relatively low pressure loads and is mainly anti-buoyancy. Over time, the foundation is easily washed by the river, causing structural damage to the foundation. In addition, if there is excessive vibration in the tunnel, the foundation is also prone to liquefaction. [0003] There are many types of foundation treatment methods for immersed tube tunnels, which can be roughly divided into scraping method, pile foundation method, sandblasting method, sand flow method, filling method and grouting method, among which sandblasting method, sand flow method, filling method and The grouting method belongs to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/12
Inventor 代敬辉王朝辉张兴业冯希民张志安李建芳肖刚刚陈鸿贺春宁王艳宁隋洪瑞沈永芳路传华
Owner CHINA RAILWAY 18TH BUREAU GRP CO LTD
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