CN101135157A

CN101135157A - Static pressure pipe pile settling construction technique

Info

Publication number: CN101135157A
Application number: CNA2006101341013A
Authority: CN
Inventors: 晏可奇; 刘忠昌; 刘晓东; 夏传清
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-10-28
Filing date: 2006-10-28
Publication date: 2008-03-05

Abstract

The static pressure immersed tube pile constructing process includes the following steps: hoisting the immersed tube with pile tip and setting in place, pressing the immersed tube into ground with one static pressure piling machine while detecting whether to have the pile tip reaching the bearing stratum until reaching the required bearing pressure, and pouring concrete with the concrete pump while lifting the immersed tube gradually until the poured concrete reaches the design elevation. The in-situ high pressure concrete pouring piling process has the features of easy control, concentrated construction jobs, less environment interference, no pollution, high piling quality and low material loss.

Description

Static pressure pipe pile settling construction technique

Technical field

What the present invention relates to is the building foundation piling technique.

Background technology

Existing building engineering foundation basis adopts the mechanical piling job practices to mainly contain long screw auger drilling deposited pile technology, diesel oil hammering or electric power vibrating type tube-sinking cast-in-situ pile technology and hydraulic prefabricated pile tube technology.The state of the art of long screw auger drilling deposited pile construction technology is: 1, produce a large amount of surflaes, the greatest problem that faces is the surflaes outward transport; 2, at Different Strata, the selection of its drilling tool and execute drill method and require very strictly is prone to the phenomenon of loosening the soil at the bottom of the hole if deal with improperly, influences bearing capacity and pile quality; 3, its to creep into component wear big, need frequently maintenance.The outstanding problem that diesel oil hammering or electric power vibrating type bore forming technology exist is: construction noise disturbs residents, air pollution, next is owing to limited by hammering energy and caliber, be difficult to bear big highrise building of load and the high pile foundation construction of requirement for bearing capacity, and its execute-in-place mode is loaded down with trivial details, backwardness; In addition, if meet the saturated soft soil layer, occur undergauge easily and the hole phenomenon of collapsing in the construction, need secondary vibration or instead insert construction processing such as strike-on.Existing static pressure prefabricated tubular pile construction technology has effectively solved surflaes and practical problems such as construction noise and air pollution, but need before construction according to bearing capacity of single pile, designing requirements such as the soil supporting layer degree of depth and traffic condition are by the prefabricated finished peg of member factory, when facing the bad ground structure, bigger as the bearing course at pile end buried depth, when surpassing stake machine limited length, then need many preformed pile stake end welding, strengthen pile foundation length, again it is pressed into bearing stratum continuously, when if bearing stratum layer position changes greatly, the unnecessary pile body that exceeds design elevation will be cut out, and wastes a large amount of prefabricated pilings; This pile-formation process method has not only increased the advance works amount, and prefabricated cost, cost of transportation and loss, the unnecessary prefabricated piling of amputation etc., has all strengthened its construction and has dropped into.

Summary of the invention

The goal of the invention of patent application of the present invention be to avoid existing various bore forming technologies weakness, provide a kind of and finish high-bearing capacity, high-quality, static pressure pipe pile settling construction technique that construction cost is low by the designing requirement scene.The static pressure pipe pile settling construction technique technical scheme that patent application of the present invention provides, the major technique content of its process is: the immersed tube that has the stake point is hung directly, is ajusted in the stake position, exert pressure to the stratum by static(al) Hydraulic pile-driving machine holding tube, when the stake end enters the design bearing stratum, when reaching design bearing capacity of single pile requirement force value, stop to exert pressure, in immersed tube, pour into concrete then, progressively promote simultaneously immersed tube, until reaching perfusion concrete design elevation.

Realize the immersed tube of the static pressure pipe pile settling construction technique of patent application of the present invention, its structure is that the coaxial core pipe that is provided with constitutes in immersed tube, the hinged stake point that is provided with in its core pipe lower end.

This static pressure pipe pile settling construction technique technical scheme, by continuing also adjustable hydraulic power with in the immersed tube injection stratum, directly realize on-the-spot bore forming operation again to immersed tube mesohigh perfusion concrete, its designing technique index is easy to control, this technical scheme is not limited by formation variation, self controllablely satisfy the design bearing capacity requirement, feed intake, avoided year stake, unnecessary raw material loss and the waste of pile extension by actual effective length metering.And can directly implement the experiment of bearing capacity static load, and easy to operate, easy row need not anchoring pile in the test, and adding counterweight with the deadweight of stake machine can test, and its bearing capacity of single pile improves 20-30% than diesel oil hammering or electric power vibrating type pile.The construction technology of technical solution of the present invention has in the construction operation quantity set, construction environment is disturbed the technical characterstic little, that the time spent is short, pile quality is high.Control immersed tube hoisting velocity when cooperating high pressure pumping perfusion concrete, thus normal undergauge, the hole phenomenon of collapsing that occurs in diesel oil hammering or the electric power vibrating type pile-formation process avoided, guarantee its pile quality.

Description of drawings

Describe the technology of the present invention content in detail below in conjunction with accompanying drawing.

Fig. 1 is the construction sequence figure of this static(al) hydraulic pressure pile foundation construction process method

Fig. 2 is the immersed tube structural representation

Fig. 3 is a pipeline sinking pile point structural representation.

The specific embodiment

The static pressure pipe pile settling construction technique that patent application of the present invention provides, the immersed tube structure of its use is: its upper end is provided with the adpting flange 3 that communicates with concrete high pressure delivery pipes 2, the hinged stake point 4 that utilizes its high-pressure to open when injecting the high pressure concrete that is provided with in lower end.Implement the immersed tube of construction technique of the present invention, can be existing general seamless thick walled steel tube, be hinged with valve stake point 4 in the lower end of immersed tube; Also can adopt immersed tube structure as shown in Figure 2, this immersed tube has adopted double-layer sleeve structure, i.e. the coaxial core pipe 10 that is provided with in immersed tube, and the hinged stake point 4 that is provided with in its core pipe lower end, the pipe sheaf space between core pipe 10 and the outer immersed tube 1 is sealed by pipe end up and down; This double-layer sleeve structure is to determine the pile section by the immersed tube external diameter, guarantee the connectivity and the stability of concrete pressurization pressure by bore and the corresponding to core pipe of concrete transfer pipeline, in the immersed tube lifting process, adjust concrete pumping pressure and immersed tube hoisting velocity at any time, thereby guarantee pile quality according to formation variation.This static pressure pipe pile settling construction technique is such specific implementation, its first processing step is: the hanging device by Static pressure pile driver places the stake position to hang directly, ajust immersed tube, and holding tube primer fluid pressure device is exerted pressure it to the stratum, and adjust its active force of exerting pressure according to entering formation variation, when the stake end arrives predetermined soil supporting layer, and satisfy when designing bearing capacity of single pile requirement force value, then stop to exert pressure, as (a) of Fig. 1; Thereafter second step has adopted the immersed tube that has the core tubular structure, pour into concrete by high-pressure delivery concrete pipeline 2 pumping in core pipe 10 that its upper flanges connects, progressively promote simultaneously immersed tube 1, its hoisting velocity should be decided according to formation variation and phreatic situation, reach design stake top mark height until perfusion concrete amount, as Fig. 1 (b), install reinforcing cage 7 again, finish one round trip bore forming process, as (c) of Fig. 1.Adopt common immersed tube to implement this construction technique, the upper end of immersed tube is provided with the concrete high pressure delivery pipes except that connecting, also be provided with vibrator, its second step is: when the stake end reaches predetermined soil supporting layer, and after satisfying design bearing capacity of single pile requirement force value, stop to exert pressure, install reinforcing cage reaches design elevation and fixing in immersed tube again, in immersed tube, pour into concrete, and the lifting immersed tube, start vibrator simultaneously, will pour into concrete encryption, tamping, reach design elevation until perfusion concrete amount, finish one round trip bore forming process.

In this static pressure pipe pile settling construction technique, the stake point of its common immersed tube can be prefabricated concrete stake point or cast iron stake point, structure perhaps shown in Figure 3, and promptly the periphery at immersed tube lower end tube wall evenly is provided with some hinged lock shafts 5.Be articulated in each lock shaft 5 and be provided with the triangle flap valve 6 that closes up back formation cone.

Claims

1. static pressure pipe pile settling construction technique, it is characterized in that this process is: the immersed tube that has the stake point is hung directly, is ajusted in the stake position, exert pressure to the stratum by static(al) Hydraulic pile-driving machine holding tube, when the stake end enters the design bearing stratum, when reaching design bearing capacity of single pile requirement force value, stop to exert pressure, in immersed tube, pour into concrete then, progressively promote simultaneously immersed tube, until reaching perfusion concrete design elevation.

2. according to the static pressure pipe pile settling construction technique of claim 1, it is characterized in that its immersed tube that adopts is the coaxial double-deck immersed tube that the core pipe is set in the immersed tube, after entering the design bearing stratum at its end, reaching design bearing capacity of single pile requirement force value and stop to exert pressure, pour into concrete by high-pressure delivery concrete pipeline pumping in the core pipe that the immersed tube upper flanges connects, progressively promote simultaneously immersed tube, its hoisting velocity should be decided according to formation variation and phreatic situation, reach design stake top mark height until perfusion concrete amount, install reinforcing cage is finished one round trip bore forming process again.

3. according to the static pressure pipe pile settling construction technique of claim 1, it is characterized in that it adopts the individual layer immersed tube, the immersed tube upper end also is provided with vibrator, when the static(al) Hydraulic pile-driving machine reaches the design bearing course at pile end with the immersed tube injection, and satisfy and design bearing capacity of single pile requirement force value, after stopping to exert pressure, install reinforcing cage reaches design elevation and fixing in immersed tube, in immersed tube, pour into concrete, and the lifting immersed tube, start vibrator simultaneously, will pour into concrete encryption, tamping, reach design elevation until perfusion concrete amount, finish one round trip bore forming process.