Construction method for solving pile foundation over-filling and sediment in karst region

A construction method and slag sedimentation technology, which can be used in basic structure engineering, sheet pile walls, buildings, etc., can solve the problems of pile bottom sediment, increased construction trouble, overfilling and other problems, and achieve construction quality and construction period guarantee, construction quality and construction. The effect of cycle optimization and high pile strength

Inactive Publication Date: 2021-03-09
CHINA NERIN ENG
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Problems solved by technology

However, due to geological reasons in karst areas, pipe piles are often required to pass through karst caves. Using the above method for construction, traditional cast-in-situ piles often have problems of overfilling and pile bottom sediment, which adds a lot of trouble to construction.

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  • Construction method for solving pile foundation over-filling and sediment in karst region
  • Construction method for solving pile foundation over-filling and sediment in karst region

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Embodiment Construction

[0025] Attached below Figure 1-2 And embodiment the present invention is described further:

[0026] A construction method to solve over-filling and sedimentation of pile foundations in karst areas. The prefabricated pipe piles used in the construction are prestressed high-strength concrete pipe piles. The specific construction steps are as follows: ①Rotary excavation lead hole: use rotary excavation pile machine or submerged hole Hammer pilot hole for rotary digging, the diameter of the pilot hole is 20~100mm larger than the diameter of the prefabricated pipe pile. It is determined according to the length of the pile. If the pile grows longer, the pilot hole takes the larger value. The sediment at the bottom of the hole should be cleaned, and the hole position error is ±5.00cm , The verticality deviation of the lead hole should not be greater than 0.5%.

[0027] ② After the introduction hole, inject grout into the introduction hole, and use a catheter to pour an appropriate...

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Abstract

The invention discloses a construction method for solving pile foundation over-filling and sediment in karst regions. The method comprises the following steps: a rotary pile drilling machine or a down-the-hole hammer is adopted to guide a hole, the diameter of the guide hole is 20-100mm larger than that of a tubular pile, and a proper amount of fine aggregate concrete is poured into the range of abearing stratum at the lower end part of the tubular pile. After the prestressed high-strength concrete pipe pile is conveyed to be close to the bottom of a hole, a hammering pile driver or a staticpressure machine is started, a gap between the pipe wall and the hole wall of the pipe pile is filled with fine aggregate concrete poured into the pile end in advance through extrusion, the pile end is stabilized, and the sediment problem is solved. The method well solves the difficult problems of pile foundation over-filling and pile bottom sediment in karst regions. Compared with a traditional cast-in-place pile, the cast-in-place pile has obvious advantages in the aspects of construction quality, construction period and engineering investment.

Description

technical field [0001] The invention relates to a construction method for engineering pile foundations, in particular to a construction method for solving over-filling and sedimentation of prefabricated pipe pile foundations in karst areas. Background technique [0002] Prestressed concrete pipe pile is a prefabricated concrete pile that embodies the progress of contemporary concrete technology and the high-tech level of concrete products. It is a pile type that is widely used at present. Compared with the pile body, it has high strength, good driving resistance and crack resistance, and can withstand high hammering force. It can be made into various pipe piles of different specifications and lengths according to needs. Factory centrifugal production can ensure quality and other advantages. The construction of prestressed concrete pipe piles generally adopts impact hole-forming cast-in-place piles, rotary-dug hole-forming piles, and full-sleeved soil (rock) hole-forming cas...

Claims

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Application Information

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IPC IPC(8): E02D5/50E02D5/58E02D7/00
CPCE02D5/50E02D5/58E02D7/00
Inventor 徐建李大浪刘皓邹明立袁昆
Owner CHINA NERIN ENG
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