CN102312430A

CN102312430A - Pipe sinking expansion pressure grouting pile forming method

Info

Publication number: CN102312430A
Application number: CN201110104220A
Authority: CN
Inventors: 王庆伟; 王琢璐
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-04-26
Filing date: 2011-04-26
Publication date: 2012-01-11

Abstract

The invention belongs to a building construction method, and in particular relates to a pipe sinking expansion pressure grouting pile forming method. The method comprises the following steps of: 1, sinking an outer pipe, the interior of which is provided with a core pipe and the front end of which is provided with a pointed valve, to the designed depth of a pile body by adopting a high-frequency hydraulic vibrating hammer; 2, when the outer pipe is uplifted and concrete is pumped to the height which is 1/5 to 3/5 of the pile at the same time, performing downward vibration and extrusion to form expansion on the concrete of the pile bottom and the pile body, repeating the operation for 2 to 3 times according to the requirement of bearing capacity, or omitting the step; 3, when the outer pipe is uplifted, continuously pumping concrete by using a high pressure pump, or lifting the pipe and continuously pumping and grouting the concrete while vibrating, so that the concrete of the pile body is more compact; and 4, if the pile foundation is constructed, forming the pile after a reinforcement cage is placed. By the pipe sinking expansion pressure grouting pile forming method, the bearing capacity of the pile body is greatly improved, noise and waste oil are not produced in construction, the civilization level of the construction environment is ensured, the production efficiency is high, and the engineering cost is reduced.

Description

The squeezed pressure of immersed tube is irritated into pile work method

Technical field

The invention belongs to construction techniques, the squeezed pressure of particularly a kind of immersed tube is irritated into pile work method.

Background technology

At present, in long-spiral-compacted-concrete pile, semi-screw pile, perfusion helical burr ram, all adopt the spiral drilling and forming hole, the high-pressure pump guncreting forms bored concrete pile technology; But in the castinplace pile of immersed tube class, also do not use the method pile that does not more utilize the high-pressure pump guncreting in the squeezed pile of technical method, particularly immersed tube of high-pressure pump guncreting, tube-sinking cast-in-situ pile is to sink to desired depth to pipe; Behind the descending reinforcing cage from top with hopper castinplace pile body concrete, vibrate tube pulling then, the flap valve valve of bottom is opened under gravity concrete; Because pressure is little, often the unlatching of flap valve valve is undesirable, causes broken pile sometimes; Undergauge, folder mud, reveal problems such as muscle, influence the bearing capacity of pile body, and speed of application is slow; Bearing capacity is low, and work efficiency is low; Existing several kinds of " the complex carrier compaction piles " invented in the pile work method are to utilize elongated hammer to ram pore-forming; Outer tube presses down thereupon and puts in place, fills out building waste and harsh concrete etc. from the sidewall mouth of outer tube again, is lowered to reinforcing cage; From sidewall mouth concrete placing; Dialled the outer tube pile, this technology efficiency of construction is low, presses pipe and pile water shutoff difficulty when stake is long; It also is to insert from the sidewall mouth that " static force top press poured piles " its filler is arranged in addition, owing to adopt the static pressure inner and outer pipes, often meets closely knit layer of sand and boulder bed and is difficult to penetrate; Also have " full pound type bottom-enlarging filling pile " and " interior rammer tube-sinking cast-in-situ pile "; The former whole pile body adopts low hammer compaction pile concrete, and the latter adopts weight impact pile end concrete, and the filler mode is the filler from the top; Shortcoming is that noise is big; Can't construct in the city, efficient is low, and the concrete of above-mentioned method for filling contact not as the high pressure pumping of concrete with hole wall soil, influences bearing capacity and brings into play.

Summary of the invention

The objective of the invention is to overcome above-mentioned technical deficiency, the squeezed pressure of immersed tube of a kind of single pile bearing height is provided, guarantee pile quality, construct noiselessness, raising the efficiency is irritated into pile work method.

The technical scheme that technical solution problem of the present invention adopts is: the characteristics that the squeezed pressure of immersed tube is irritated into pile work method are: 1, adopt the high frequency hydraulic vibration driver, have the core pipe to inside, the outer tube that front end has a pointed flap valve valve sinks to the projected depth of pile body; 2, carry outer tube simultaneous pumping concrete on and account for 1/5 ~ 3/5 when height of stake, vibrate extruding downwards, at the bottom of the stake and the concrete of pile body form squeezedly, according to requirement for bearing capacity, repeat this operation 2 ~ 3 times, also can omit this step; When carrying outer tube 3,, utilize high-pressure pump uninterrupted pumping concrete, but carry pipe while vibrating, uninterrupted pumping guncreting in limit makes pile concrete more closely knit; If 4 pile foundations, pile behind the placement reinforcing cage.

The invention has the beneficial effects as follows: the squeezed pressure of immersed tube is irritated into pile work method increases substantially the bearing capacity of pile body, the construction noiselessness, and no spoir, assurance construction environment civilization degree, production efficiency is high, reduces construction costs.

The specific embodiment

Below in conjunction with embodiment the present invention is specified.

Embodiment; It is the defective that overcomes long-spiral-compacted-concrete pile, semi-screw pile, tube-sinking cast-in-situ pile that the squeezed pressure of immersed tube is irritated into pile work method; Adopt the squeezed guncreting again of immersed tube pile-formation process, the pile body of formation carries greatly and improves, and adopts high frequency hydraulic vibration driver immersed tube; The high-pressure pump pumping of concrete, efficiency of construction significantly improves.Worker's method that it adopts is: 1, the drilling tool that adopted of the squeezed pile of immersed tube hole is that front end has pointed valve; The outer tube inboard is the core pipe, and the core pipe outside is an outer tube, and outer tube plays the retaining wall effect; Inner core tube be pumping of concrete passage, utilize the high frequency hydraulic vibration driver; Outer tube is sunk to the projected depth of pile body,, be convenient to sink to because the front end valve is pointed; 2, promote outer tube, in the stake hole, concrete is pumped into 1/5 ~ 3/5 high height of stake, the concrete that pumps into is vibrated extruding with high-pressure pump; To at the bottom of the stake and the concrete of pile body form squeezed; According to requirement for bearing capacity, can repeat this operation 2 ~ 3 times, also can omit this step; 3, Vibration on Start-up hammer promotes outer tube, on when dialling outer tube, utilize high-pressure pump uninterrupted pumping concrete, pipe is carried in limit continuous shaking, the continuous pump pressure concrete placing in limit makes the concrete of pile body more closely knit to a stake design height, and bearing capacity is increased substantially; If 4 pile foundations, pile behind the placement reinforcing cage in the stake hole.

It is the method combination pile with immersed tube hole forming method and high-pressure pump guncreting that this kind becomes pile work method; Adopt high frequency hydraulic vibration driver immersed tube pore-forming, make the speed of pile faster, noiselessness, and penetration capacity is stronger; Except that can not be in the decomposed rock stratum the pore-forming; Other stratum all can the pore-forming pile, and can the squeezed concrete of secondary, the bearing capacity of stake is higher, cost significantly reduces.

Claims

1. the squeezed pressure of immersed tube is irritated into pile work method, it is characterized in that: 1, adopt the high frequency hydraulic vibration driver, have the core pipe to inside, the outer tube that front end has a pointed flap valve valve sinks to the projected depth of pile body; 2, carry outer tube simultaneous pumping concrete on and account for 1/5 ~ 3/5 when height of stake, vibrate extruding downwards, at the bottom of the stake and the concrete of pile body form squeezedly, according to requirement for bearing capacity, repeat this operation 2 ~ 3 times, also can omit this step; When carrying outer tube 3,, utilize high-pressure pump uninterrupted pumping concrete, but carry pipe while vibrating, uninterrupted pumping guncreting in limit makes pile concrete more closely knit; If 4 pile foundations, pile behind the placement reinforcing cage.