Construction method of open caisson

A construction method and caisson technology, applied in caissons, foundation structure engineering, construction, etc., can solve problems such as small caisson anti-heaving coefficient, cracking, uneven settlement of structures, etc.

Inactive Publication Date: 2020-07-10
广东省建筑工程监理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the caisson sinks through the silty sand layer and enters the silty clay layer, it is prone to the unfavorable phenomenon of caisson inclination and sudden settlement, which is likely to bring great disturbance to the external soil, and the struc

Method used

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  • Construction method of open caisson
  • Construction method of open caisson
  • Construction method of open caisson

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Example 1, such as figure 1 , image 3 Shown, a kind of caisson construction method comprises the following steps:

[0084] (1) Construction preparation work, on-site layout of temporary structures, mechanical equipment and construction water and electricity lines according to the general layout plan; set up gantry piles around the caisson, and use lime powder to draw the well central axis and foundation pit outline, As the basis for caisson fabrication and sinking positioning; it should be noted that in order to meet the requirements of construction machinery and equipment and civilized construction, a construction access road is built in the construction enclosure. Ash three slag, then pave 20cm concrete; heavy-duty vehicles and crane driving area first lay 25cm thick fly ash three slag, and then lay 25cm concrete; the inner surface of concrete is Φ8@250 two-way reinforced mesh. Along the side of the caisson, a steel bar processing plant, formwork assembly site, and...

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Abstract

The invention discloses a construction method of an open caisson. The construction method comprises the steps of construction preparation work; foundation pit excavation as well as sand cushion layerand plain concrete cushion layer manufacturing; open caisson first-section, open caisson second-section and open caisson third-section manufacturing; open caisson first-time sinking; open caisson fourth-section and open caisson fifth-section manufacturing; open caisson second-time sinking; open caisson underwater plain concrete bottom sealing; open caisson bottom plate manufacturing; and pipelinebuttress, mud discharging well and tail work construction. The open caisson sinks by adopting an undrained process, the soil sampling mode is matched with an air mud suction diver, and the sinking assisting mode is sinking by a pressure sinking method and resistance reduction and sinking assisting by thixotropic mud. According to the method, the sinking method is adopted, the posture of the open caisson is convenient to control, the sinking precision of the open caisson is high, the depth of open caisson blade feet penetrating into a soil layer is larger through a counter-force system, the sufficient sinking coefficient is achieved, the sinking speed of the open caisson can be greatly increased, disturbance to external soil is small, the phenomenon that a structure is prone to differentialsettlement, deformation, cracking and the like are effectively prevented, and a soil bin in a well lattice cannot be raised in the sinking process.

Description

technical field [0001] The invention relates to the technical field of caisson construction, in particular to a construction method for caissons. Background technique [0002] The sinking of the caisson mainly passes through the soil layers, which are plain fill soil layer, silt layer, silty clay layer, and silty sand layer. Among them, the silt layer and silty clay layer have low strength, low permeability, high water content, high compressibility, high sensitivity, thixotropy and rheology. Compared with the silty sand layer, the borehole friction resistance and bearing capacity of the silt layer and silty clay layer are greatly reduced. After the caisson sinks through the silty sand layer and enters the silty clay layer, it is prone to the unfavorable phenomenon of caisson inclination and sudden settlement, which is likely to bring great disturbance to the external soil, and the structure is prone to uneven settlement and deformation , cracking and other phenomena; at th...

Claims

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Application Information

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IPC IPC(8): E02D23/08E02D23/16
CPCE02D23/08E02D23/16
Inventor 黄隆盛张足理刘玉龙廖一博吴曼华
Owner 广东省建筑工程监理有限公司
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