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Rotary milling type deep stirring water sealing curtain construction method

A water-stop curtain and deep mixing technology, which is applied in the fields of engineering and building engineering, can solve the problems of difficult ultra-deep water-stop curtain construction requirements, limited cutting depth of soil layer, and difficult construction completion, etc., so as to improve cement utilization rate and environmental protection. Small impact, the effect of increasing the cement utilization rate

Inactive Publication Date: 2015-12-02
SHANGHAI FOUND ENG GRP
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Problems solved by technology

During the construction of underground engineering, especially deep foundation pit engineering with high groundwater level, a water-stop curtain is often set on the outside of the support pile to reduce the impact of the surrounding groundwater on the underground structure. The water-stop curtain generally adopts the form of continuous cement-soil mixing pile. The water-stop curtain encounters geological layers that are difficult to penetrate within the designed depth range, such as hard soil layers, pebbles, and boulders. Conventional deep mixing technologies such as two-axis, three-axis or even five-axis cement-soil mixers can It is difficult to complete the construction; at the same time, the TRD construction method has strict requirements on equipment. In addition to the high cost, the depth of the soil layer that can be cut is limited, and it is difficult to achieve the construction requirements of the ultra-deep water-stop curtain

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  • Rotary milling type deep stirring water sealing curtain construction method

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Embodiment Construction

[0016] Such as figure 1 As shown, a rotary milling type deep mixing water-stop curtain construction method includes the following steps:

[0017] 1. Concrete cushion 1 construction ( figure 1 middle ①) to ensure the stability of the construction work surface;

[0018] 2. Mark the location of the construction work, and carry out on-site laying-out according to the design requirements ( figure 1 Middle ②), including milling mixer pay-off 2;

[0019] 3. Milling mixer center positioning ( figure 1 Middle ③), ready to cut in place;

[0020] 4. Jet cement grout ( figure 1 Middle ④), when drilling down, spray the mixture of bentonite and water on the top of the milling to increase the millability of the soil layer, and spray the mixture of cement, bentonite and water on the top of the milling to form a cementitious material;

[0021] 5. cutting mud ( figure 1 Middle ⑤), the milling mixer can fully cut the soil in the horizontal direction, ensure the full mixing between ce...

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Abstract

The invention relates to a rotary milling type deep stirring water sealing curtain construction method, which comprises the following steps: 1 concreting cushion construction; 2 marking the construction work position; 3 positioning the center of a milling type mixer; 4 injecting cement slurries: the milling top injects a mixture of bentonite and water when drilling downwards and injects a mixture of cement, bentonite and water when lifting upwards to form a gelling material; 5 cutting slurry: the milling type mixer can cut the soil fully in horizontal direction; 6 moulding a wall: two construction processes of sleeving-milling combination and single extruding can be adopted based on demand in the construction process; 7 repeating steps 3 to 6 to complete the construction process of the whole water sealing curtain. Through the process, the construction quality in the milling type deep stirring water sealing curtain construction can be substantially improved, and a stable underground water sealing curtain can be formed.

Description

technical field [0001] The invention relates to a construction method of an underground water-stop curtain in the field of building engineering, and is especially suitable for super-deep foundation pit water-stop curtains, dam retaining walls and other projects. Background technique [0002] Coastal areas have rich groundwater and thick permeable layers. When carrying out large-scale infrastructure construction, the first problem to be solved is the difficulty of water sealing and high safety risks. During the construction of underground engineering, especially deep foundation pit engineering with high groundwater level, a water-stop curtain is often set on the outside of the support pile to reduce the impact of the surrounding groundwater on the underground structure. The water-stop curtain generally adopts the form of continuous cement-soil mixing pile. The water-stop curtain encounters geological layers that are difficult to penetrate within the designed depth range, such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D19/18E02D29/02
Inventor 张思群周雪莲吴洁妹李耀良余振栋黄秋亮李吉勇
Owner SHANGHAI FOUND ENG GRP
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