RU213054U1 - Multiblade screw pile - Google Patents

Abstract

A multi-bladed screw pile is proposed, including a shaft with a tip and at least one blade fixed on the shaft, where the tip is cut at an acute angle. In this case, the number of pile blades is three or more, where odd blades, counting from the tip, are selected with the same larger diameter, and even blades, counted from the tip, are selected with the same smaller diameter. Also, the barrel is made in the form of a hollow pipe, in which a plug is fixed at the end of the tip cut. The technical result is an increase in the holding capacity of the pile in layered soils. 2 w.p. f-ly, 1 ill.

Description

The proposed technical solution relates to construction, namely to screw piles intended for the construction of foundations for various buildings and structures, and is used for layered soils consisting of coarse and stone-saturated layers, interspersed with soft inclusions in the form of soft-plastic clay and water-saturated loams.

A multi-bladed screw pile is known, see patent No. 2725348 dated 07/02/2020. This pile is designed to work in permafrost soils and consists of a shaft, one or more extension rods connected to the shaft and head, at least one helical blade and fasteners. At the same time, this pile has two or more blades, and each subsequent blade, located above the previous one, is made of a larger diameter. Also, the tip of this pile is cut at an acute angle.

This pile is practically not intended for use in layered soils due to the fact that the upper large blades do not hold well in soft upper rocks. Also, this pile is more bulky.

The objective of the proposed solution is to create piles for layered soils, consisting of coarse-grained and stone-saturated layers, interspersed with soft inclusions in the form of soft-plastic clay and water-saturated loams.

The technical result is an increase in the holding capacity of the pile in layered soils.

The technical result is achieved by the fact that the multi-blade screw pile includes a shaft with a tip, at least one blade fixed to the shaft with the possibility of installing at least one sleeve extension connected by six high-strength bolts to the shaft, and the tip is cut at an acute angle. In this case, the number of pile blades is three or more, where odd blades, counting from the tip, are selected with the same larger diameter, and even blades, counted from the tip, are selected with the same smaller diameter. Also, the barrel is made in the form of a hollow pipe, in which a plug is fixed at the end of the tip cut.

The tip should preferably be cut at an angle of 30-45°.

The distance between the blades is chosen basically the same.

Usually the number of blades in the proposed pile is no more than 6.

The proposed solution is illustrated by a figure showing the proposed pile.

The figure shows the following positions:

1 - trunk;

2 - blades of larger diameter,

3 - blades of smaller diameter;

4 - tip;

5 - plug.

The essence of the proposed multi-blade screw pile is disclosed in the figure, which shows the main elements of this pile.

The barrel 1 is a hollow pipe, in which a beveled tip 4 is made in the end part. This tip 4 can be made separately, for example, from harder metals better suited to working with hard surfaces and welded to the pipe, but in the simplest case it can be made by a simple bevel of the trunk, at an acute angle, for example, 45 °. At the same time, the center of the pipe is covered with a plug 5. This plug prevents the passage of rocks into the center of the hollow bore; accordingly, it is also advisable to make the plug from harder materials with increased strength. The plug 5 is preferably welded into the hole of the barrel 1.

Also, blades 2, 3 are fixed on the barrel 1. The first, third, fifth, etc. (odd blades) blades 2 perform the same and larger diameter. In this case, the first blade is fixed as close as possible to the tip 4. The best option, as shown in the figure, is when the tip 4 goes into the first blade of a larger diameter 2, which is an additional stiffener and strengthens the pile in a weakened section. Behind the blade of a larger diameter 2, at some distance (selected depending on the depth and hardness of the soil), the blades of a smaller diameter 3 are fixed, then the blades of a larger diameter 2 are fixed again, etc., alternating large and small blades. Blades 2, 3 and the following are usually welded to the shaft 1, but they can also be fixed with a fastening tool on the shaft 1. This alternation of the blades leads to improved pile operation in layered soils, consisting of coarse and stone-saturated layers, interspersed with soft inclusions in the form of soft plastic clay and water-saturated loams. Thanks to this design, the holding capacity of the pile in layered soils is improved.

To connect the pile to the gripping mechanism of the pile driver, there are round mounting holes in the top of the pile. Blades, as a rule, piles are located at equal distances from each other, not further than 20 mm from the plane of the plug and not less than 500 mm from the center of the lower mounting hole. Piles can be equipped with pile extensions that are bolted to the shaft using a welded socket.

Claims (3)

1. A multi-blade screw pile, including a shaft with a tip and one blade fixed to the shaft, where the tip is cut at an acute angle, characterized in that it additionally contains at least two blades, while the odd blades, counting from the tip, are selected to be the same larger diameter, and even blades, counting from the tip, are selected with the same smaller diameter, the barrel is also made in the form of a hollow pipe, in which a plug is fixed at the end of the tip cut. 2. Multi-bladed screw pile according to claim 1, characterized in that the tip is cut at an angle of 30-45°. 3. Multi-bladed screw pile according to claim 1, characterized in that the distance between the blades is the same.

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