CN1355354A - Cast-in-situ pedestal pile with variable bearing and its construction method - Google Patents

Abstract

A cast-in-situ pedestal pile for building, bridge and foundation is composed of concrete pile column, reinforcing bar cage in the said pile column, grouting pipe bound to the said reinforcing bar cage, and several variable supporting disks. Its forming method includes such steps as drilling hole of pile, squeezing and expanding to form variable supporting disks, putting reinforcing bar in the hole of pile, pouring concrete into pile hole and supporting disks, and cement grounting the pile bottom and supporting disk under sides. Its advantages include high load-bearing capacity and low drained slurry.

Description

Type variable bottom-expanding chassis grouting pile and forming method

One, technical field:

The present invention relates to a kind of type variable bottom-expanding chassis grouting pile and forming method, it belongs to a kind of pore-forming cast-in-place concrete pile and forming method.

Two, background technology:

The bearing capacity of well-known ordinary concrete castinplace pile is low, and pile strength is difficult to performance, and sediment of the hole bottom and loosened soil are difficult for handling clean, so it exists that bearing capacity is low, cost is high, easily cause shortcomings such as the big and discharging mud amount of building settlement is big.

Three, summary of the invention:

The objective of the invention is to solve the technological difficulties that pouring pile bearing capacity is low, cost is high, building settlement is big and the discharging mud amount is big and a kind of bearing capacity height is provided, cost is low, a stake end does not have the sediment loosened soil, building settlement is less and little type variable bottom-expanding chassis grouting pile and the forming method of discharging mud amount.

For finishing above-mentioned task, the technical solution used in the present invention is: this type variable bottom-expanding chassis grouting pile, and it comprises a reinforcing cage, concrete pile, Grouting Pipe and several variable supporting-plates, wherein: it also comprises cement paste; Grouting Pipe is tied up on reinforcing cage, reinforcing cage is located in the concrete pile, make the stock inlet of Grouting Pipe stretch out the end face of concrete pile, the grout outlet of Grouting Pipe stretches out the bottom surface of concrete pile, variable supporting-plate is located at the bottom of concrete pile or the middle and lower part of pile, and cement paste is located on the bottom surface of the bottom of concrete pile and the variable supporting-plate that is located at the concrete pile column bottom.

Above-mentioned variable supporting-plate be shaped as conically shaped body or annulus conically shaped body.

The forming method of above-mentioned type variable bottom-expanding chassis grouting pile is to be finished by following step:

(1), at first by designing requirement with the boring machine hole of driving piles;

(2), use can be in the stake hole the squeezed or machinery that digs expansion in the bottom in stake hole or the middle and lower part in stake hole squeezed or dig the variable supporting-plate that is shaped as conically shaped body or annulus conically shaped body that expands into one or more same diameters or different-diameter;

(3), the reinforcing cage that will be tied with Grouting Pipe is put into a hole;

(4), concrete is injected the variable supporting-plate of stake hole and conically shaped body or annulus conically shaped body;

(5), with the slip casing by pressure machine by Grouting Pipe, cement paste be poured in the bottom of concrete pile and be located on the bottom surface of variable supporting-plate of concrete pile column bottom.

Because the present invention combines squeezed, post grouting process, and according to different soil layers a dish of several same diameter or a dish of different-diameter are set in same stake hole, the bearing capacity of pile foundation is improved, sedimentation reduces; And by slip casting elimination pile bottom sediment and loosened soil and the inherent shortcoming at the stake end, improve stake pedosphere face, soil body at the bottom of making in the certain limit obtains reinforcing, therefore the present invention compares with background technology, have that bearing capacity height, cost are low, a stake end does not have the sediment loosened soil, pile quality is good, advantages such as economical with materials, reduction of erection time and minimizing sludge volume.

Four, description of drawings:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the A-A sectional drawing among Fig. 1.

Five, the specific embodiment:

The invention will be further described below in conjunction with drawings and Examples.

As depicted in figs. 1 and 2, the type variable bottom-expanding chassis grouting pile in the present embodiment, it comprises the variable supporting-plate 4 of a reinforcing cage 2, concrete pile 3, Grouting Pipe 1 and two annulus conically shaped bodies, wherein: it also comprises cement paste 5; Grouting Pipe 1 is tied up on reinforcing cage 2, and reinforcing cage 2 is located in the concrete pile 3, makes the stock inlet of Grouting Pipe 1 stretch out the end face of concrete pile 3, and the grout outlet of Grouting Pipe 1 stretches out the bottom surface of concrete pile 3, so that cement paste is infused in the bottom of pile; Two variable supporting-plates 4 are located at the bottom of concrete pile 3 and the middle part of pile respectively, and cement paste 5 is located on the bottom surface of the bottom of concrete pile 3 and the variable supporting-plate 4 that is located at the concrete pile column bottom, to improve the bearing capacity of concrete pile.

The forming method of above-mentioned type variable bottom-expanding chassis grouting pile is:

(1), at first by the engineering design requirement with the boring machine hole of driving piles;

(2), use can be in the stake hole squeezed machinery at the bottom in stake hole and the middle part in stake hole the squeezed variable supporting-plate that is shaped as the annulus conically shaped body that becomes two same diameters;

(3), the reinforcing cage that will be tied with Grouting Pipe is put into a hole;

(4), concrete is injected the variable supporting-plate of stake hole and annulus conically shaped body, make it be shaped to concrete pile and variable supporting-plate;

(5), with the slip casing by pressure machine by Grouting Pipe, cement paste be poured in the bottom of concrete pile and be located on the bottom surface of variable supporting-plate of concrete pile column bottom.

The shape of the variable supporting-plate in the foregoing description also can be conically shaped body.

Variable supporting-plate in the foregoing description can also be provided with the variable supporting-plate of 3-5 same diameter or different-diameter, and (it is fixed that the quantity of a dish is looked the length of pile body, the diameter that props up dish is fixed by the bearing capacity of concrete pile), one of them is located at the bottom of concrete pile, and all the other evenly are located at the middle and lower part of concrete pile.

Squeezed machinery in the foregoing description method step (2) can also adopt and dig expansion formula machinery, digs in the stake hole and expands into variable supporting-plate.

Claims (3)

1, a kind of type variable bottom-expanding chassis grouting pile, it comprises a reinforcing cage, concrete pile, Grouting Pipe and several variable supporting-plates, it is characterized in that: further comprising cement paste: Grouting Pipe is tied up on reinforcing cage, reinforcing cage is located in the concrete pile, make the stock inlet of Grouting Pipe stretch out the end face of concrete pile, the grout outlet of Grouting Pipe stretches out the bottom surface of concrete pile, variable supporting-plate is located at the bottom of concrete pile or the middle and lower part of pile, and cement paste is located on the bottom surface of the bottom of concrete pile and the variable supporting-plate that is located at the concrete pile column bottom.

2, a kind of type variable bottom-expanding chassis grouting pile according to claim 1 is characterized in that: described variable supporting-plate be shaped as conically shaped body or annulus conically shaped body.

3, a kind of forming method that makes the described type variable bottom-expanding chassis of claim 1 grouting pile, it is characterized in that: this forming method is finished by following step:

(1), at first by designing requirement with the boring machine hole of driving piles;

(2), use can be in the stake hole the squeezed or machinery that digs expansion in the bottom in stake hole or the middle and lower part in stake hole squeezed or dig the variable supporting-plate that is shaped as conically shaped body or annulus conically shaped body that expands into one or more same diameters or different-diameter;

(3), the reinforcing cage that will be tied with Grouting Pipe is put into a hole;

(4), concrete is injected the variable supporting-plate of stake hole and conically shaped body or annulus conically shaped body;

(5), with the slip casing by pressure machine by Grouting Pipe, cement paste be poured in the bottom of concrete pile and be located on the bottom surface of variable supporting-plate of concrete pile column bottom.

Images