Construction method of conjoined mortar piling wall

Abstract

The invention discloses a construction method of a conjoined mortar piling wall which is used for retaining and protecting for foundation excavation in the field of buildings. The construction method comprises the following steps of: sinking a steel sleeve to a designed elevation at a first piling position by using high-frequency hydraulic vibratory piling hammering machine along a central line of a conjoined piling wall; taking out soil in the steel sleeve; after a formed pore is qualified, putting sand soil taken out from the steel sleeve mixed with water, cement or lime into a stirrer for uniformly stirring; pouring the stirred mortar into the steel sleeve; pulling out the steel sleeve in a high frequency way to form a first mortar piling; then sinking a pipe to the designed elevation at a second piling position which is engaged with the first piling position; and repeating piling-forming construction steps to form the conjoined mortar piling wall. The construction method is applicable to constructions of water seepage prevention and earth-supporting-pile wall structure under any geological conditions, except rock strata; the close-grained mortar body pilings are formed in the frequency vibration way while pulling the steel sleeve by a piling machine; and by utilizing local materials, not only spoil and freight of construction materials can be reduced, but also construction cost can be reduced under the premise of ensuring the water seepage prevention effect.

Description

1. Technical field [0001] The invention relates to a foundation pit support construction method in the field of industrial and civil buildings. 2. Background technology [0002] With the rapid rise of land prices, the use of underground space has been fully valued by people. In order to meet the needs of different depths and different geological foundation pit support, the foundation pit support technology is also developing in a diversified manner. At present, the common foundation pit supporting water-stopping methods include mixing cement-soil pile method, rotary jet grouting method and plain concrete (reinforced concrete) pile water-stop curtain, among which plain concrete piles or reinforced concrete piles have manual digging according to the construction method , Punching (drilling) into holes, rubbing pipe into holes, conjoined barrel pile method and other forms. [0003] From the scope of application of the above foundation pit support and water stop methods, the ce...

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Problems solved by technology

[0003] From the scope of application of the above foundation pit support and water stop methods, the cement-soil mixing pile method, the rotary jet grouting method, and the combined cylinder pile method are only suitable for sandy soil or soft soil, and the application range is limited; among them, the cement-soil mixing pile method method and rotary jet grouting method are also due to the small diameter of the pile and the difficulty in controlling the verticality, resulting in uneven occlusion of the upper and lower parts of the pile body, often resulting in poor occlusion of the lower part or even two adjacent piles that do not occlude and overlap, which affects the anti-seepage effect ; The artificial digging method in the plain concrete (reinforced concrete) pile occlusal method is not guaranteed because of safety, and the country restricts its use; The pipe rubbing hole forming method adopts the full casing method, and the pile quality is guaranteed, but it is only suitable for sandy soil, other soils, side friction resistance is large, and the pipe rubbing efficiency is low; although the conjoined barrel pile is a relatively advanced Foundation pit support method, but it requires large and expensive construction equipment, and it cannot be constructed when there is a hard soil layer in the soft soil

[0004] The above several foundation pit support and water-stopping methods can be used alone or in combination according to needs, but generally they cannot be used in hard soil layers, the scope of use is limited, and generally consume more cement, which is costly and expensive. Due to the early setting time and high early strength, when there are mechanical failures, water cuts, power outages, etc., the construction of piles cannot be carried out as planned, and additional piles are often required, which increases construction costs

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