A kind of pile foundation enclosure construction method
A construction method and technology for pile foundations, which are used in infrastructure engineering, sheet pile walls, buildings, etc., can solve the problems of high cost, difficult to pour concrete, complicated and difficult construction methods, etc. Effect
Active Publication Date: 2020-06-09
HUBEI UNIV OF TECH
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Problems solved by technology
[0003] In order to solve the problem that the pile body concrete of the pile foundation penetrating through the karst cave is not easy to pour, solve the problem that the steel casing support in the deeper part is difficult to lower down, and solve the problem that the construction method of the pile foundation penetrating through the karst cave is complicated, difficult and expensive. A pile foundation enclosure construction method that can reduce construction costs and provide construction safety
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[0029] The mode and implementation steps of the present invention will be further described below in conjunction with the accompanying drawings.
[0030] Such as Figure 1 to Figure 8 Shown, a kind of pile foundation enclosure construction method, comprises the following steps:
[0031] Step 1, such as figure 1 As shown, after the treatment of the construction site is completed, the drilling rig is put in place, and the pile hole 8 passing through the karst cave area is constructed using the drilling construction process without mud participation. During the drilling process of the upper covering layer 5 of the karst cave, 7 steel casings are used. The upper covering layer 5 of the karst cave is reserved for installation allowance L between the bottom of the steel casing 7 in the pile hole 8 and the top of the karst cave 4 0 ;
[0032] Step 2, such as figure 2 As shown, after the construction of the pile hole 8 is completed, the variable cross-section casing 2 in the fold...
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The invention discloses a pile foundation enclosure construction method. The method includes the steps that firstly, a no-mud drilling construction process is adopted for forming a pile hole running through a karst cave area; after the pile hole is formed, a hoisting device is used for lowering a closed variable-section casing into the pile hole of the karst cave area; the position of the variable-section casing is adjusted so that the upper end and the lower end of the variable-section casing can be located in the pile hole in the top and the bottom of the karst cave respectively; airbags prearranged in the variable-section casing are inflated, the variable-section casing is expanded by the airbags to have the same size as the pile hole, and meanwhile a steel casing in the pile hole in anupper covering layer of the karst cave is pressed downwards so that the variable-section casing can be shaped and positioned under pressure; the airbags in the variable-section casing are deflated and recovered; a reinforcement cage is lowered, concrete pouring is carried out on a pile body through a duct, and after the pile body is solidified, pile foundation construction is completed. The method can effectively save steel; besides, by utilizing the inward retraction characteristic, it can be avoided that the steel casing rubs against the wall of the pile hole when being lowered, and lowering is easier.
Description
technical field [0001] The invention belongs to the technical field of pile foundation construction in civil engineering, and in particular relates to a pile foundation enclosure construction method passing through a karst cave area, which solves the problem that concrete is not easy to pour when a pile body penetrates a large karst cave. Background technique [0002] my country's karst area is vast. With the rapid development of urban development and transportation construction, karst geological conditions are often encountered in engineering construction, and karst caves bring great harm to the stability of the foundation. The use of pile foundations in karst areas is becoming more and more widespread, but when the pile foundation needs to penetrate the cave to meet the bearing capacity requirements, the existence of caves brings many difficulties to the construction of the pile foundation. Existing construction methods include backfill method and steel casing follow-up me...
Claims
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IPC IPC(8): E02D5/38E02D5/66
CPCE02D5/38E02D5/665
Inventor 刘永莉巴军涛郭斌肖衡林李丽华何俊马强姚晋文陈智万娟
Owner HUBEI UNIV OF TECH