SU1715975A1 - Hole-forming device for hollow cast-in-place piles - Google Patents

Abstract

The invention relates to the field of construction, in particular to the construction of hollow bored piles. The purpose of the invention is to increase the carrier. of the made pile. A device for forming openings: comprises a rod 3, 2 spacer elements in the form of tubular segments, attached to it by means of hinged arms; 1, the bottom 7. The rod 3 is equipped with sliding sleeves1 4, to which the tie rods 2 are attached, and clamps 5. The centers of the segments 1 are radially displaced relative to the axis of the device, and their arcs have different sizes with overlapping adjacent sections. The bottom 7 is made with an elastic sheath 8 and is attached to the spacer elements of the hinge 6 gami. 4 Il.

Description

The invention relates to the construction, in particular to the construction of hollow bored piles.

The aim of the invention is to increase the bearing capacity of the pile being manufactured.

FIG. 1 shows the device, a longitudinal section; in fig. 2 - the same, cross section; in fig. 3 shows the layout of the segments; Fig. 4 shows the layout of the device in the well and is ready to go.

The device consists of four spacer elements in the form of tubular. Segments 1, with hinged arms 2 connected to the supporting rod 3, placed-

along the longitudinal axis of the device. The tubular segments are mounted so that their centers in the radial direction are shifted relative to the axis of the device, and their arcs have different sizes with overlapping adjacent sections.

On the carrier bar 3 there are sliding sleeves 4, on which the ball ends are fastened. The other ends of the bar r 2 are hinged on the inner surface of the tubular segments 1. On the carrier bar 3, clamps 5 are rigidly mounted, limiting the movement of the bar relative to the bushes 4. K . The bottom of segments 1 is pivotally attached to the bottom of segments 1 with the help of t g 6

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slit 7, which for sealing the joint is additionally connected by an elastic shell 8 to the lower edges of the segments 1..

The radius of segmenters 1 (RC) is taken to be more than half the radius of the circumscribed circle (R0), but less than the integer value of the radius of the circumscribed circle (0 0.5). If, 5Kd, then between segments 1 there will be a gap, Tie they only close at some Rftj, which is less than R0. When contacting the segments will be on the inner surface, which {is technologically undesirable, since the ends of the overlapping segments can be trapped in the concrete. The arc length of the overlapping segment is 0.25 of the circumference of the segments, and the length J of the arc of the overlapped segment is always greater than 0.25, but less than 0.5 of the length of this circle. With equal lengths of arcs when the movement of the segments of contact between them is not. The displacement of the centers of circles of two segments from the center of the circumscribed one: the circle is equal to the difference of the radii of the circumscribed circle and the circle of the segment (a R6HFlg) .;

The device works as follows 3 times.

I

 For example, for the manufacture of piles with a diameter of 1.0-1.2 m, it is necessary to use segments made of pipes with a diameter of 0.63 m with a circumscribed circumference of diameter 0.7 m. The weight of the rod with a diameter of 100-150 mm is 1 , 0-1, .5 tons. The stroke of the rod relative to the sleeves is taken 0.5-1.0 m. Under these parameters, an armature framework is installed in the drilled well, the concrete mix is poured to a height of 5-6 m and a device is lowered into the well with a crane. own weight sinks. 3-4 m into the concrete mix. With a lifting crane, the boom 3 rises by 0.5 N, 0 m, and using clamps 5. through i the sleeves 4 push the thrust rod 2 into the upper position. At the same time, the pull-rod 2 occupies an inclined position and pushes towards the center (towards the boom 3) tubular segments 1. Then the bar 3 is dropped, striking the bottom 7 and through the sleeves 4 with the rods R. along the tubular segments 1. In this case, the bottom 7 moves downward, and the tubular segments 1 are moved sideways and down. Under the influence of

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The boom 1 device is immersed in the concrete mix, compacted along the shaft, and at the base of the pile. The elastic shell 8 protects the concrete mixture from entering the internal cavity of the device. When the thickness of the concrete layer is 0.5-0.8 m under the bottom, the diving is stopped and the concrete mixture is poured through the gap between the borehole wall and the lateral surface of the segments until the well is completely filled. Then the crane lifts the device to a height of 1-2 m again by striking the rod and submerging it to a depth so that under the bottom a layer of concrete is 0.5-0.8 m. With this bottom, the concrete is compacted at the base of the pile, and the tubular segments - along the shaft . In the extended position of the tubular segments, leave the device until the concrete has set. Then his crane is removed from the cavity of the pile. For this purpose, the rod 3 is lifted to the full. Fixators 5 lift the sleeves 4, which through the hinges lift the inner ends of the m r 2, and the tie rods take an inclined position. In steps 2, the tubular segments 1 move to the center (to the rod 3) and a gap is formed between their outer surface and the concrete. The device is then removed from the pile and installed in a different well.

The use of the device will make it possible to manufacture piles of increased bearing capacity, which is achieved by compacting the concrete mix and adjacent soil along the shaft at the base of the pile. . .:. :. -. F o rm u l a i o o b r e n i

A device for the formation of holes in the construction of bored piles, including a rod, attached to it by means of hinged and spacer elements, made in the form of tubular segments and a bottom, so that In order to increase the bearing capacity of the pile being made, the rod is equipped with sliding sleeves along its length, sliding sleeves to which the ends of the hinge-type and spacer elements are attached, and clamps, while the centers of the circumferential spacer elements in the radial direction are displaced about relative to the axis of the device, and their arcs have different magnitudes with overlapping

 , -. 1715975.

adjacent areas, with the bottom, straightened to the spacers of the hinge with elastic sheath and attached rods.

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Claims (1)

FORUM LAYOUT A device for forming holes during the construction of Hollow bored piles, including a rod attached to it by means of articulated rods: spacer elements made in the form of tubular segments and a bottom, characterized in that, in order to increase the bearing capacity of the manufactured pile, the rod is equipped with located along its length with sliding bushings to which the ends / ^{1 of the} articulated are connected. rods of spacer elements, and clamps, while the centers of the circles of adjacent spacer elements in the radial direction are offset relative to the axis of the device, and their arcs have different sizes with overlapping adjacent sections, and the bottom is hinged to the spacer elements with an elastic shell and attached ; traction.