RU215199U1 - REINFORCED SCREW CONCRETE PILE - Google Patents

Abstract

The utility model is used in the construction of foundations for buildings and structures for various purposes. The technical result is an increase in the bearing capacity of the pile in the ground. The pile has a cylindrical shaft, a cone-shaped lower part, a cone-cylindrical upper part and a concrete screw winding; The cone-shaped lower part is pointed, the angle of the cone can be different and depends on the density of the soil. The conical-cylindrical upper part of the increased diameter serves to compact the soil loosened in the upper zone of the well when the pile is screwed in. Screw concrete winding is made from the tip to the head, or may not reach the head in order to reduce the friction force when twisting into deep bearing soils. The pile is screwed into the ground mechanized using a metal key. 6 w.p. f-ly, 6 ill.

Description

The field to which the utility model belongs

The utility model relates to the field of construction. It is used in the construction of foundations for buildings and structures for various purposes, supports of bridges, piers, pipelines, communication and power lines, retaining walls, for anchoring soils and structures working to pull out of the soil.

State of the art

A screw concrete pile is known (patent RU 166450 IPC E02D 5/56 publ. 11/27/2016), which includes a pile body with a conical lower part made with a screw winding, the length of which is equal to 2/3-1/5 the length of the pile body. The frame reinforcement of the pile is made of longitudinal rods connected by transverse ties. A pipe with a section in the form of a polygon with an open entrance is located in the center of the pile body and is equipped with a removable all-metal key. The length of the key is equal to the length of the pipe.

The disadvantages of this model are:

1. Lack of reinforcement at the pile head where the maximum torque is applied. The destruction of concrete is possible when applying a large torque.

2. Lack of broadening in the area of the pile head for compaction of the soil loosened during twisting. Cavities may form, which can cause subsidence of the soil and the pile itself.

Also known is a screw concrete pile (patent RU 2646282 MPK E02D 5/56, publ. 03/02/2018), which contains a hollow shaft made of concrete, inside of which a hollow shaped metal pipe is coaxially located, wrapped with structural reinforcement and made with the possibility of installation in its cavity of the internal a key for twisting, while the end part of the pile contains a drilling coil made of metal. The side surface of the pile at its tip may have concrete blades, or it may be smooth.

Also known is a screw concrete pile (patent RU 179155 IPC E02D 5/30, E02D 5/56, publ. 04/28/2018), which consists of a concrete screw pile structure made in the form of a hollow concrete shaft, the cavity of which has a polygonal cross section and goes along the entire length of the concrete body of the pile. The reinforcing cage is made of longitudinal reinforcement, wrapped around the entire length with reinforcement, made in the form of a spiral, while the hollow concrete shaft at the end part has a metal tip with a drill. The side surface of the pile at its tip may have concrete blades, or it may be smooth.

The disadvantages of the above two models are:

1. The presence of concrete coils only in the terminal part significantly limits the bearing capacity and does not use the full potential of the pile.

2. The tip and the drilling coil made of metal in the terminal part of the pile are very laborious and expensive to manufacture. Metal will rust over time.

3. Lack of reinforcement at the pile head where the maximum torque is applied. The destruction of concrete is possible when applying a large torque.

4. Lack of broadening in the area of the pile head for compaction of the soil loosened during twisting. Cavities may form, which can cause subsidence of the soil and the pile itself.

The essence of the utility model

The task to be solved by the proposed technical solution is to create a pile with improved bearing capacity.

The technical result achieved in the implementation of the present utility model is to increase its bearing capacity both in torsion and in the ability to carry a higher load in the ground.

The specified task and the technical result obtained are achieved by the fact that the pile has a cylindrical shaft, a cone-shaped lower part, a conical-cylindrical upper part of an increased diameter and a concrete screw winding, a reinforcing cage is located in the pile body, and a metal profile pipe of polygonal cross section is located along the length of the pile. open entrance to install the key.

The pile shaft is cylindrical. The cone-shaped lower part is pointed, the angle of the cone can be different and depends on the density of the soil. The cone-cylindrical upper part of the increased diameter is used to compact the soil loosened in the upper zone of the well when the pile is screwed in. Screw concrete winding is made from the tip to the head, or may not reach the head in order to reduce the friction force when twisting into deep bearing soils. The reinforcing cage is made of a metal profile pipe and parallel longitudinal rods, with transverse reinforcement of the spiral type. Longitudinal reinforcement may have outlets in the head area for connection with possible monolithic structures. The profile pipe of polygonal section is located in the center of the pile, has a length equal to the length of the pile minus the length of the tip cone, which depends on the required thickness of the concrete protective layer. The profile pipe has an open entrance for installing the key and a plugged end at the tip of the pile to prevent the profile pipe from being filled with concrete mixture.

In the case of weak soils, when it is not necessary to apply a large torque to twist the pile, in order to reduce the cost of production, the cavity for installing the key in the pile body can be formed without using a fixed metal pipe, but with the body of the key itself, extracted at the stage of concrete hardening. At the same time, the reinforcing cage is additionally reinforced with horizontal segments of a metal pipe of a round or square section, located in increments of not more than 500 mm along the length of the cage.

The cone-cylindrical upper part is reinforced with reinforcing mesh and steel clips.

The pile has steel mounting loops in the head area for lifting and moving the pile.

Brief description of the drawings

In FIG. 1 shows a general view of the pile, in Fig. 2 shows a frame made of a profile pipe, longitudinal reinforcement with a transverse spiral winding, in Fig. 3 shows a pile frame without a profile pipe made of longitudinal reinforcement with transverse spiral winding, with reinforcement by horizontal segments of round or square metal pipes, in Fig. 4, fig. 5 - shows the reinforcement of the head, in Fig. 6 - the key is shown.

Implementation of the utility model

The pile consists of a pile shaft 1, a cone-shaped lower part 2, a cone-cylindrical upper part 3 (Fig. 1). Concrete screw winding 4 is located along the entire length of the pile shaft, or does not reach the head.

If the cavity in the body of the pile for installing the key is formed by a non-removable metal profile pipe, then the pile frame is made of a profile pipe 5, longitudinal reinforcing bars 6 wrapped with spiral reinforcement 7 and concrete protective layer limiters 8 (Fig. 2). Longitudinal reinforcement may have outlets (in the head area) for connection with possible monolithic structures. The profile pipe 5 for accommodating a removable metal key has a section in the form of a polygon with an open entrance and a plugged end, and is located in the center of the pile body. The pile has steel mounting loops 9 in the head area for lifting and moving the pile.

If the cavity in the body of the pile for installing the key is formed without the use of a metal profile pipe (by the body of the key itself, extracted at the stage of concrete hardening), then the pile frame is made of longitudinal reinforcing bars 6, wrapped with spiral reinforcement 7 with concrete protective layer limiters 8 and reinforced with horizontal segments round or square metal pipes 10, located with a step of not more than 500 mm along the length of the frame (Fig. 3).

The reinforcement of the head consists of reinforcing meshes 11 and steel clips 12 (Fig. 4, Fig. 5).

As a material for a removable metal key 13, sheet metal of various thicknesses is used depending on the diameter of the pile (Fig. 6). The length of the key is equal to the length of the pipe or may be less. The wrench has a square hole in the upper part for connection with the hydraulic rotator rod of specialized construction equipment. To mate the key and the stem, the key has a hole for a steel "finger".

To drive the pile, a leader hole is first drilled in the ground with a diameter not exceeding the diameter of the pile shaft (the diameter of the hole depends on the density of the soil) and a depth equal to the length of the immersed part of the pile minus the depth of the cone immersed in the ground. The depth of immersion depends on the strength characteristics of the soil. Before screwing in, loose soil is removed from the bottom of the well. Then, using a metal key made of sheet steel, the pile is mechanically screwed into the well with the pile cone partially immersed in the ground to the design mark.

Claims (5)

1. Screw reinforced concrete pile, characterized in that the pile has a cylindrical shaft, a cone-shaped lower part, a conical-cylindrical upper part of increased diameter and a concrete screw winding, a reinforcing cage is located in the pile body, and a metal profile pipe of polygonal section is located along the length of the pile with an open entrance for installing a key. 2. Reinforced concrete screw pile according to claim 1, characterized in that the cone-shaped lower part is pointed, the cone angle can be different and depends on the density of the soil. 3. Reinforced concrete screw pile according to claim 1, characterized in that the cone-cylindrical upper part of the increased diameter serves to compact the soil loosened in the upper zone of the well when the pile is screwed in. 4. Reinforced screw concrete pile according to claim 1, characterized in that the screw concrete winding is made from the point to the head, or may not reach the head in order to reduce the friction force when twisting into deep bearing soils. 5. Reinforced concrete screw pile according to claim 1, characterized in that the head is reinforced with reinforcing mesh and steel clips.

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