RU2648397C1 - Reinforced concrete pressing pile and method of driving pressing reinforced concrete pile - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: structure of the reinforced concrete pile includes a solid section shaft. On the side of the head the outlets of the reinforced bars are provided. On the opposite end of the end of the pile shaft, grooves are made for the length of the outlets of the reinforced bars. The ends of the pile are strictly perpendicular to the longitudinal axis of the pile. The method of submersion of reinforced concrete pressing piles includes loading the pile into the working body of the pressing plant, vertical installation of the pile, clamping in the clamping mechanism, submersion of the pile down to the target depth, final pressing of the pile. The final pile pressing is carried out according to the pile field pattern with the pile, installed on the pile in the clamping box.

EFFECT: reduction of pile submersion time.

2 cl, 1 dwg

Description

The invention relates to the construction of buildings and structures for industrial and civil purposes, as well as objects for the use of atomic energy in terms of the device of pile foundations by the indentation method.

Known reinforced concrete driven pile (1). The pile is presented in the form of a rectangular or square section, inside of which there is a reinforcing cage, along the axis of which an injection pipe is fixed, one end of which is open and the other is closed by a cork.

The disadvantages of this pile are significant material costs in the manufacture of piles, the presence of nets in the pile heads to absorb the shock loads of driven units, the presence of a pile tip (reinforced concrete), the presence of a steel pipe over the entire length of the pile, the presence of a reinforced concrete head, which is subsequently destroyed and disposed of.

The closest in technical essence are reinforced concrete piles (2) of the series 1.01.1-10 release 1. Solid piles of solid square section with non-tensile reinforcement.

However, these piles have significant disadvantages:

1. Nets are installed in the pile body for perceiving the impact of hydraulic hammers, diesel hammers and other hammers used when driving piles — an additional expense of steel nets.

2. The head of these piles in most cases is broken (pushed) to expose the working reinforcement and lay in the slab or foundation grill, which in turn negatively affects the complexity of construction. There is also an excessive consumption of concrete in the process of manufacturing piles, which is subsequently disposed of as construction waste.

3. In the manufacture of piles, the technology of formation in metal forms is used, which significantly reduces the productivity of the enterprise for the manufacture of reinforced concrete products and structures.

There is a known method of immersing piles by indentation (3), which includes loading piles into the working body of the pressing installation, which is installed vertically and clamped in the clamping mechanism, the pile is immersed by the piston stroke of the hydraulic jacks of the indentation mechanism (up to 1.0 m), the piles are expanded in the working installation organ, raise the hydraulic jack jacks of the indentation mechanism to the upper position (idle), clamp the pile again and the cycle is repeated first until the pile is submerged to the design depth. In interlayers of dense soils, when the soil resistance to immersion exceeds the maximum pressure of the pressing unit when the minimum speed of immersion is reached, the movement of the pile is periodically stopped by reducing the pressing force to zero, remove the pile from the soil by an amount equal to the length of its side, and then lower the pile to the previous level with a minimum indentation force, after which the indentation force is brought to a maximum value and the pile is immersed at the accepted step of the technological cycle across nnogo indentation - extraction - indentation.

The disadvantages of this method are:

1. During the extraction process by an amount equal to the size of the pile ribs, the reinforced concrete pile may break.

2. Lower productivity of pile immersion due to the short length (up to 1.0 meter) of the rods of hydraulic cylinders that carry out direct pile immersion, in comparison with the proposed technology, which uses hydraulic cylinders with rod lengths of up to 2.2 meters, which in turn reduces the number of operations clamp-expand piles in the upper and lower position of the rods.

3. Lower productivity of pile immersion due to the use of a special retractor that allows you to immerse the pile below the side clamping mechanism of the pile, and further move the installation to a new place of pile immersion.

The technical result of the proposed pile is to reduce the material and technical costs associated with both the manufacture of the pile and its immersion at construction sites by the indentation method and subsequent work on concreting foundation slabs or grillages.

The proposed design of a reinforced concrete indentation pile includes a trunk that does not have a tip. Releases of the armature are provided from the side of the head. On the side of the point, recesses are provided for the length of the valve outlets. The ends of the piles are strictly perpendicular to the longitudinal axis of the piles.

The proposed reinforced concrete pile, designed specifically for the indentation technology, can be manufactured both with prestressed reinforcement and with non-stressed reinforcement, with the formation in the formwork or by contact molding.

The design of the indentation reinforced concrete pile is shown in Figure 1: a) of a square section, b) of a rectangular section, c) of a circular section, with reinforcement outlets. Due to the existing recesses in the corners in the lower part for a rectangular and square pile or in a round body, the reinforcement of the pile outlets is not damaged during immersion when being pressed, and the integrity of the pile body is ensured. Thanks to accurate measurements using electronic measuring instruments (it is possible to use optical instruments), the pile is immersed with an accuracy of ± 30 mm. The size of rebar releases is not less than 1 meter due to the ability to control the output parameters of piles with reinforcement to the design specified value. If, after the pile is completed, the output of the reinforcement exceeds the design value, the reinforcement is cut to the required size.

The method of immersing a reinforced concrete piling of an indentation includes loading the piles into the working body of the piling press, installing the piles vertically, clamping in the clamping mechanism, immersing the piles to the design depth, piling the piles, and characterized in that the punching is performed as follows in accordance with the pile field pattern of the piles mounted on the piles in the clamping box.

Thus, the pressurization is carried out by a pile, which will be immersed in the soil at a new location of the piles, following in accordance with the scheme of the pile field. Now the crushing operation has the following form: installing the pile on the pile in the clamping box, crushing the piles. Distinctive features of the proposed technology make it possible to exclude two operations in the process of piling.

According to the existing prototype method, the following operations are included in the pressurization process:

a) the rotation of the crane installation,

b) overpressure strap

c) lifting the retractor and turning towards the pile,

d) installation of a retractor, crushing piles,

d) the rise of the retractor,

e) the rotation of the crane installation to the storage location of the pressure controller,

g) lowering and unloading the re-presser.

Due to the proposed design of the pile-up crushing and the method of its immersion, the process of crushing has the following form:

a) the rotation of the crane installation to the place of storage of piles,

b) piling

c) pile lifting,

g) a turn to the submersible pile,

d) installation of piles on a pile for crushing piles.

The method is as follows. Using a crane installation, the pile is installed in a junction box in which the pile is clamped using a system of hydraulic cylinders and adapter gaskets, after which the pile is immersed into the ground with the help of vertical dipping cylinders, due to the design feature, the installation for immersion is not able to load the pile so that it was possible to move out of it without the use of a special pressurizer, with which the pile is poured into the ground, thereby freeing the installation frame and providing the possibility of the following of maneuver to a new place piles dive.

Thanks to the use of piles of the proposed design, there is no need to use a special pressurizer, the pressurization operation is carried out using another pile, which, after crushing the previous pile, will be loaded in a new place in accordance with the project.

An example implementation of the method. Pile of the proposed design is installed in the clamping box of the pressing unit. Check the accuracy of the pile in accordance with the project. Dive piles. Then, after unpacking the piles, the crane installation is rotated to the place of pile storage, the piles are lifted and installed in the clamping box on the pile in the frame, the piles are crushed, then without removing the piles that were crushed, the piles are moved to the new location of the pile and after reconciling the correct position of the pile in the plan, it immerses it.

The proposed reinforced concrete piles of indentation provide high adaptability of the process of immersion and crushing of piles. The use of piles of the proposed design provides a reduction in the time required for the piles to be immersed by the indentation method due to the absence of operations in which an inventory retractor was involved. The use of piles of the proposed design allows to increase the productivity of work up to 40%, reduce the cost of finished piles in comparison with existing structures, as well as to exclude subsequent work on the felling of pile heads subject to the production technology.

Thus, the implementation of technical and technological solutions can reduce material and technical costs through the use of piles of indentation of the described design.

Information sources

1. RF patent for utility model No. 113277, IPC E02D 5/30 dated 02/10/2012.

2. Typical building structures, products and units. Working drawings. “Piles driven reinforced concrete. Issue 1. Part 1. Solid piles of solid square section with non-tensile reinforcement. " Series 1.01.1-10. Foundation project.

3. RF patent No. 2500007, IPC E02D 7/20 of 12/10/2013.

Claims (2)

1. The reinforced concrete indentation pile, including a solid section trunk, characterized in that the pile ends are strictly perpendicular to the longitudinal axis of the pile, and the trunk from the tip side is made with reinforcement outlets of at least 1 meter, and recesses are made on the opposite end of the trunk for the length and width of the reinforcement outlets. 2. The method of immersion by pressing in a reinforced concrete pile according to claim 1, including loading the piles of the pressing installation into the working body, installing the pile vertically, clamping in the clamping mechanism, immersing the piles to the design depth, and pressing the piles, characterized in that the pressing is performed as follows in accordance with the scheme pile field piles mounted on a pile in a clamping box.

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