Construction method for complete casing tube thin wall filling pile and movable internal mold

Abstract

The invention discloses a full-sleeve thin-wall filling pile construction method and a movable internal mould. The construction method increases the capability for penetrating the foundation soil by the single layer sleeve by a large scale with the large exciting force and high-frequency vibrating hammer. A majority of groundwork soil layers except the strong decayed rock can be penetrated. The single layer sleeve which is longer than 20 meters and has diameter for 0.8-2.0 meters is one-time sunk into the foundation soil. The earth can be fetched by carrying an earth-fetching pipe by a high-frequency hammer or fetched artificially. When the designing request is satisfied, a movable internal mold and a reinforcement cage are taken into and the concrete is poured. The single layer sleeve isthen vibration-drawn out. When the concrete is finally solidified, the movable internal mold is detached and is filled again thereby forming a thin-wall filling pile. The technique increases the construction efficiency for a large scale and avoids the influence of the squeezed earth to the surrounding building, roadway and pipeline and the pollution to the surrounding environment. The vibration and drawing of the pipe can greatly increase the quality of the concrete at the pile shaft. The using of the movable internal mold saves considerable amount of concrete to obtain a maximum structure effect with a least material consumption.

Description

1. Technical field [0001] The invention relates to the construction technology and construction equipment of foundation pit support in the field of industrial and civil buildings, in particular to the construction technology and construction equipment of cast-in-place piles. 2. Background technology [0002] At present, the support forms of deep foundation pits in my country are divided into two categories: retaining support and reinforced support. [0003] The commonly used types of support and their advantages and disadvantages are as follows: [0004] 1. Steel sheet pile support: Steel sheet pile support has the advantages of fast construction speed and reusability. It is suitable for foundation pits of 5 to 10 meters, but there are expensive steel materials, large one-time investment, and often require more Defects such as road support that affect the earthwork excavation construction of the foundation pit. [0005] 2. Bored cast-in-place pile retaining wall: It is oft...

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Problems solved by technology

[0004] 1. Steel sheet pile support: Steel sheet pile support has the advantages of fast construction speed and reusability. It is suitable for foundation pits of 5 to 10 meters, but there are expensive steel materials, large one-time investment, and often require more Defects such as road support that affect the earthwork excavation construction of the foundation pit

[0005] 2. Bored cast-in-place pile retaining wall: It is often used for φ600-1000mm cast-in-situ piles to make a row of pile retaining walls, and the top is poured with concrete crown beams. It has the advantages of high rigidity, strong bending resistance, and relatively small deformation. The disadvantages are: due to the quality problems such as broken piles, necking, segregation and mud inclusion in bored piles, there are often hidden dangers in the project, and the amount of concrete is large, and the construction cost is high

Although the tube pile has many advantages mentioned above, its scope of application is very limited. It is only suitable for soft soil, and due to the limitation of the power of mechanical equipment, the depth of the immersed tube is limited.

[0010] To sum up, the existing foundation pit support structures have different limitations, such as high cost, low rigidity, unreliable construction quality, or limited scope of application, etc.

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