RU2251609C2 - Bearing pile - Google Patents

Abstract

FIELD: building, particularly for constructing foundations of various building structures.

SUBSTANCE: bearing pile comprises head, rod and tip fixed to embedded rod part by embedded member. The tip is formed of thermoplastic concrete and has electric heater located inside the tip. Electric heater heats the tip after driving thereof into ground as far as it will go to obtain softening temperature of 80-150°C. Then the pile is fully driven in ground. Electric heater wires are placed in tube in longitudinal rod direction and brought outside under pile head for connection thereof with electric power source.

EFFECT: increased load-bearing pile capacity due to provision of widened pile tip support area.

2 cl, 5 dwg

Description

The invention relates to the field of construction and can be used in the construction of foundations of various structures.

During construction in conditions of weak soils, pile foundations of foundations consisting of submerged (clogged) in soil and interconnected grillages are widely used.

One of the common types of piles is a pile-stand, the bearing capacity of which depends on the cross-sectional area of its tip and the strength of the material from which it is made [1]. The lateral surface of the pile piles does not transmit forces due to friction with the soil, because it under load practically does not move down due to the low deformability of the soil under its tip.

Known pile-rack with a widening tip due to the disclosure of the metal plates of the tip after driving the pile-rack to "failure". However, their use is limited due to the large metal consumption.

The objective of the invention is to increase the bearing capacity of the pile-rack on the ground.

This task is achieved in that the tip of the pile-rack is made of thermoplastic concrete with a strength of at least 300 concrete grade and contains an electric heater inside in the form of a nichrome spiral for heating it.

The essence of the invention lies in the fact that after driving the pile-stand up to "failure", its tip is heated to a temperature of 80-150 ° C, i.e. to a state of softening, after which dosing is performed. As a result, the softened material of the tip under the pressure of the rod breaks into the sides of the pile-rack, forming its broadening. After free cooling, the flat tip becomes the support of the rod.

The present invention is characterized by figures 2, 3, 4 and 5, where the pile stand is shown in working condition.

Figure 2 shows a pile stand prepared for driving into the ground.

In Fig.3 - hammer blows pile driven into the ground.

In Fig. 4, the pile is clogged to "failure" and the tip is warming up.

Figure 5 - shows the pile driving after heating the tip, as a result of which it changes its shape - it becomes flat.

A general view of the pile-rack is shown in figure 1. It consists of a rod 1, a tip 2 and a tip 3, rigidly connected by means of an embedded part 4 with an embedded part 5 of the rod 1. An electric heater 6 of a nichrome spiral is mounted in the thermoplastic concrete tip 3, the contacts of which 7 with a wire 8 laid along the pipe 9, along the rod 1 piles are brought out by contacts 10 to the outside under the head 2 for connection with an electric current source 13.

Works pile stand as follows.

Prepared for work pile-rack (figure 2) hammer with a hammer 11 into the ground 12 of figure 3. When the "failure" shown in Fig. 4 occurs, the contacts 10 of the electric heater 6 are connected to the electric power source 13 and the tip 3 is heated. Figure 5 shows how the hammering of the rack 11 is dosed by impacts of the hammer 11, as a result of which the tip 3 is broadened. The positive effect is that an increase in the support of the piles makes it possible to reduce the number of piles necessary for the construction of foundations.

Sources of information

1. B.I. Dolmatov. Designing pile foundations in soft soils. L .: Stroyizdat, 1975, p. 4, 15.

Claims (2)

1. A pile consisting of a head, a rod and a tip rigidly connected by means of a embedded part with a embedded part of the rod, the tip being made of thermoplastic concrete of a concrete grade of at least 300 with an electric heater located inside to warm the pile tip after it is driven into the ground until a “failure” is received to a softening temperature of 80 - 150 ° С followed by dosing of the pile, while the wires of the electric heater are laid along the pipe along the rod and brought out under the head to connect to a source of electrical ka.  2. The pile according to claim 1, characterized in that the tip is made of a mixture of hard unplasticized polyvinyl chloride with a filler from a number of cement, stone flour in a ratio of 1: 2-5.

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