The method of construction of piles

 

(57) Abstract:

The inventive method involving immersion in the casing soil, bottom muted during the immersion pipe, education broadening by trebovaniya portions of dry concrete mix through the casing, removing the last and the subsequent introduction of broadening precast pointed bottom of the barrel. The stem is implanted into the broadening by a certain amount determined above dependence. 9 Il.

The invention relates to the construction, in particular to the construction of pile foundations.

A known way of constructing piles with dirt fifth [1], including immersion in the casing soil, temporarily muted the bottom of the pipe, utrambovyvaya portions of the dry mixture through the casing, removing the casing pipe and the subsequent formation of the barrel by monolithic concrete.

The disadvantage of this method is monolithic formation of the barrel, extending the construction time.

Closest to the present invention is a method of constructing piles [2], which includes the drilling leader of the wells, laying it hard concrete and subsequent implementation of precast, pointed at the bottom of the barrel. is regarding broadening, which makes full use of the carrying capacity of the broadening.

The aim of the invention is to increase the carrying capacity of constructed piles while reducing material consumption.

This goal is achieved by the fact that the method of construction of piles, including immersion in the casing soil, temporarily muted the bottom of the pipe, education broadening by trebovaniya portions of dry concrete mix through the casing, removing the casing and subsequent implementation in broadening precast pointed at the bottom of the barrel, the barrel implement in broadening the value determined by the dependence of

= R-R - + C1 + where R is the radius of the broadening before introduction into it of the trunk;

With the radius of a circle inscribed in the cross-section of a trunk;

m=cos2(cos+sin)2; n=sin2(tg--1); P=tg ;

- the angle between the vertical and the oblique side surface of a cone inscribed in a pointed lower part of the trunk.

In Fig. 1 shows the driving of the casing; Fig. 2 - education ball broadening when utrambovyvaya dry mixture; Fig. 3 is formed broadening extracted with casing pipe; Fig. 4 - the process of driving piles into the top hole of Fig. 5-7 diagram, changing the shape of the balls is the introduction of the stem has a cylindrical shape; in Fig. 9 - shape broadening in the plan during the implementation of the trunk prismatic shape.

It is known that during piling dry concrete mix through the casing in the ground formed by the broadening of the ball-shape. Introduction in the formed ball broadening precast, pointed at the bottom of the barrel causes the deformation of the ball broadening and changing its shape mainly in the direction of increasing diameters in horizontal planes. Depth driving precast barrel in the original ball broadening significantly affects the shape and geometrical dimensions of the newly received broadening.

After hydration of the cement in the dry concrete mix broadening the design of piles is a monolithic system, including precast barrel, interacting with the concrete design of the broadening, and the estimated diameter of the broadening is determined by the condition of strength against punching shear piles in the proposal that punching can occur on the surface of the pyramid (cone), the sides of which begin at the lower edge of the pile and inclined at an angle of 45about. From the embedding depth of the precast pointed at the bottom of the barrel in ball broadening depend on the dimensions of the pyramid jacking and sledovatel the ball broadening must be determined from the terms of the acquisition the biggest pile bearing capacity, i.e., the maximum cross-sectional area of the pyramid (cone) punching shear at the limiting angle 45aboutin the newly formed broadening.

Considered the task of moving points on the circle with the introduction of a circular symmetric planar element having the form of a pile end. Found the optimal size of the introduction , in which the bearing angle of 45abouthas the largest horizontal projection. Made the following assumptions: did not take into account the internal friction and the influence of the environmental movement was considered to be occurring normal to the contour of the pile end. Obtained under these assumptions the expression to determine the optimal value , as shown by experimental studies, close enough to reflect the actual pattern. Unaccounted for in theory of factors have an impact mainly on the absolute values of the displacements of the surface of the broadening, while the main ratio between the amount of introduction of a pointed barrel and the maximum working diameter remains almost unchanged. This conclusion is both in the sense of forming and carrying capacity remains valid not only for axisymmetric flat, but the CLASS="ptx2">

Casing pipe 1 is muted temporarily at the bottom, for example, the tube 2 of the dry cement and sand mixture, is immersed by impact mechanism, such as a RAM (not shown) in the soil on a given mark. Then drummer 3, the stroke of which is limited by the lower edge of the casing 1, the tube 2 knocked to the ground and the casing 1 is dry mixed concrete portions, for example, the volume in loose condition D3/8, where D is the inner diameter of the casing. When utrambovyvaya mixture in the soil formed by the broadening of the 4 ball-shape with increasing radius R1. When the radius of the broadening of project size R, the controlled displacement of strombomonas mixture, the casing pipe 1 is extracted from the ground. Formed in the top hole 5 is immersed pile 6, for example prismatic reinforced concrete, with particular reference 7 in the lower part and seat it in the broadening of the 4. When submerged piles on the value of 1<. When submerged piles at the optimum depth , is formed an additional amount of broadening 9, characterized by the highest value of the base of the prism pressing, with > . If you continue to dive piles in broadening, for example, the value of 2> effect is reduced and formed by the additional broadening of 10 Henie make a comparison with the length extracted from the soil casing.

P R I m m e R. the Proposed method of construction of the piles were tested on the court, composed of loamy soils with the following characteristics: =18,7 kN/m3;s= 26,8 kN/m3;SC=to 14.6 kN/m3; W=31,31%; WL=39,17%; WP=22,24%; IP= 16.9%; IL=0,54; f=0,82; Sr=1,0; C=20 kPa; =9about; F=7.0 MPa.

For trebovaniya dry mix was used specially made setup SKIF-1 with the following parameters: outer diameter of the casing 320 mm, inner diameter of the casing pipe of 300 mm, a length of casing pipe 3000 mm, the diameter of the striker 210 mm Installation was mounted on a piling Assembly.

The dry mixture to trebovaniya was adopted as follows: 8 wt.h. sand with fineness modulus of 1.1 and 1 wt.h. cement grade 300.

As a team, pointed at the bottom of the trunk was used piles brand C4-30 (GOST 19804.1-79. Piles precast concrete). The geometrical characteristics of piles: length 4000 mm, width of the cross section of 300 mm, length of taper 250 mm. Thus, C=150 mm =20,8about.

theoretical radius of the ball broadening was adopted R=300 mm

The estimated optimal depth of immersion, calculated according to the parameters R, C and amounted to =the s and amounted to =61,6-3/tg =54 see

All was created by trebovaniya dry mix four broadening. For the formation of one broadening was tramboline 0,141 m3mix in the bulk state, volume one portion was 0.03 m3. After removing the casing to accelerate hydration in each well was flowing water in a volume of 30 litres In three of the four ball Bay driving unit were scored piles. Pile No. 1 was introduced in broadening on the value =54 cm, pile N 2 - value1=25 cm, pile N 3 - value2=65 see the

After 28 days were comparative static test piles (GOST 5686-78. The piles. Test methods). The same pile draught of 10 mm pile No. 1 took a load of 126,3 kN pile N 2 - 103,4 kN pile N 3 - 91,7 kN.

For control formed broadening pile No. 1 and ball broadening were open. In the measurements it was found: the average radius of the ball broadening amounted to R=312 mm, depth driving piles into the ball broadening was 51 cm, the typical size of the broadening associated with the prism punching shear = 345 mm

The METHOD of construction of PILES, including immersion in the soil muted below for the period of immersion of the casing, education broadening by trebovaniya since the precast pointed at the bottom of the barrel, characterized in that the stem is implanted into the broadening by an amount determined by the dependence of

< / BR>
where R is the radius of the broadening before introduction into it of the trunk;

C is the radius of a circle inscribed in the cross-section of a trunk;

m= cos2(cos + sin)2; n = sin2(tg-1); p = tg;

- the angle between the vertical and the oblique side surface of a cone inscribed in a pointed part of the trunk.

 

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