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Well-sinking method on muddy ground and first section shaft structure of open caisson

A wellbore and first section technology, applied in the field of first section wellbore structure, can solve the problems of difficult control of the wellbore subsidence speed and easy occurrence of sudden subsidence, and achieve the effects of reducing the bottom sealing process, accelerating subsidence, and speeding up the construction speed.

Inactive Publication Date: 2018-11-13
HANGZHOU GENCE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a muddy ground caisson method that can prevent both sudden subsidence and slow subsidence, and solves the problem that the wellbore sinking speed is difficult to control and prone to sudden subsidence when the existing wellbore construction method is constructed in muddy soil The problem

Method used

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  • Well-sinking method on muddy ground and first section shaft structure of open caisson
  • Well-sinking method on muddy ground and first section shaft structure of open caisson

Examples

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Effect test

Embodiment 1

[0016] Embodiment one, see figure 1 , a first shaft structure of a caisson, including a shaft 1. The shaft includes a shaft wall 11 of reinforced concrete structure and several vertical partition walls 12 located in the space enclosed by the shaft wall. There are two vertical and two very vertical partition walls, a total of 4 pieces. The vertical partition wall isolates nine well holes 13 extending in the vertical direction in the space enclosed by the well bore wall. The lower end of the well hole in the middle is closed to form a closed structure. The lower ends of the remaining 8 well holes are connected with hydraulic gates 2 for closing the well holes. The hydraulic gates in 4 well holes are closed, and the other 4 hydraulic gates are open. A lifting propeller 4 that drives the wellbore to rise and a descending propeller 5 that drives the wellbore to descend are connected through the connecting frame 3 in the wellbore with the lower end closed. The connecting frame ...

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Abstract

The invention relates to a well-sinking method on a muddy ground. The method comprises the following steps: S1, manufacturing a first section shaft provided with a wellhole; S2, mounting a hydraulic gate in the lower end of the wellhole; S3, sinking the first section shaft under the action of self weight; S4, adjusting a hydraulic valve to control the sinking speed of the shaft and correcting theshaft; and S5, mounting the shaft and sinking the follow-up shafts in position. In the shaft sinking process, a lifting propeller which drives the shafts to ascend and a descending propeller which drives the shafts to descend are connected to the uppermost section shaft. When the shafts still sink suddenly after all hydraulic valves are closed, sudden sinking is prevented by means of a force generated by the lifting propeller to lift the shafts. When the descending speed of the shaft is still lower than an expected value when all the hydraulic valves are opened, sinking of the shaft is accelerated by means of a force generated by the descending propeller to press the shaft, and the descending speed is also controlled by means of the propeller. During construction in soil, the problems thatthe descending speed of the shaft is unlikely to control and the shaft sinks suddenly are solved.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a caisson method on a muddy ground and the first section shaft structure of the caisson. Background technique [0002] Ordinary wellbore construction method, first make a wellbore on the surface, and then under the protection of the well wall, continuously dig soil from the well, so that the wellbore gradually sinks under the action of its own weight, and after reaching the predetermined design elevation, seal the bottom and build the interior structure. However, when the soil quality of the construction is relatively thick muddy soil, the wellbore mainly uses its own weight for subsidence construction, and appropriate control measures need to be taken to prevent problems such as sudden subsidence and offset. Construction in silt soil (also known as muddy land) adopts the undrained sinking method, the sinking speed of the shaft is difficult to control, and problems...

Claims

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Application Information

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IPC IPC(8): E02D23/00E02D23/08
CPCE02D23/00E02D23/08
Inventor 危金兰
Owner HANGZHOU GENCE TECH CO LTD
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