SU958585A1 - Method of measuring the depth of penetration of pile into earth - Google Patents

Description

The invention relates to construction and is intended to determine the depth of reinforced concrete piles, submerged soils, as well as the integrity of the concrete shell and piles.

There is a known method for determining the depth of a pile in the ground, which includes digging a pit around a pile and measuring the distance from the surface of the ground to the tip of the pile til.

The closest technical solution to the invention is a method for determining the depth of a pile in the ground, including the immersion of a metal rod in the soil near the pile being tested and probing the soil 2.

The disadvantages of this method are the impossibility of producing static sounding of the soil inside the pile floor and pile bushes and in the soil less compressed at the base of the pile, and the cost of the work is also high.

The purpose of the invention is to improve the accuracy and expand the range of measurement of the depth of the pile.

The goal is achieved by the fact that, according to the method for determining the depth of pile immersion in the ground, including the immersion of a metal rod in

the soil near the test pile and the soil probing, record the design parameters of the test pile, connect its armature and metal rod to the electric impulse time recorder, measure the time of the electric impulse passing through the reinforcement of the test pile and its natural model of known length and determine the time of the electric impulse The depth of the pile in the ground.

The drawing shows a device implementing the proposed method.

15

Reinforced concrete pile 1 with sections of bare reinforcement 2 is connected with a clamp 3 and conductor 4 to the terminal of the measuring equipment 5, which has a recorder of the time of arrival of reflected electrical impulses. To the measuring equipment 5 are connected via a conductor.

6 metal pin connector

7 and conductor 8, battery constant

25 current 9.

The method is carried out as follows.

Claims (2)

A brass rod 7 is immersed in the ground not less than 0.5 m in the ground near the driven pile 1. The measuring equipment 5 is connected by means of a wire; EV 4 and 6 metal armature 2 piles 1 and rod 7. The measuring equipment 5 contains a recorder measuring the arrival time of the pulse reflected from the tip of the armature 2. Switch on the measuring equipment 5 to the DC battery 9, feed the probing an electrical impulse to metascic reinforcement and the time of arrival of its reflection is recorded. The design parameters of test pile 1 and its reinforcement 2, i.e. measure their cross sections (diameter, width of pile sides), including the profile of vertical reinforcing bars 2. Then, a full-scale model of a test pile of various lengths with a scale, for example, 0.5 m, is made. Connect the reinforcement model of the pile to the measuring equipment in the laboratory or working conditions, under the electric impulse, into the metal scissors of the model pile and record the time of arrival of its reflection. The results of the time, the passage of an electrical impulse through the metal fittings of the person being tested, the pile and the model pile are compared. Knowing the speed of propagation of an electric pulse in vacuum and introducing a correction for the change in this speed in the metal of the reinforcement, determine the length of the pile. The advantages and method are; there is no need for static sounding near the pile and excavation of the hole, reducing the time of measuring the length of the pile and increasing their accuracy. The method can be used mainly for the reconstruction and superstructure of buildings and structures, as well as for checking the pile floor. The method can be applied simultaneously to determine the length of the pile, and to determine its bearing capacity. The invention The method for determining the depth of a pile in the ground, including immersion of a metal rod in the ground near the test pile and sounding of the soil, characterized in that, in order to improve the accuracy and extend the measurement range of the depth of reinforced concrete piles, the test parameters of the test pile are fixed its armature and metal rod to the time pulse of the electric pulse, the time of passage of the electric pulse through the armature of the test pile and its The travel model of known length and by the results of the comparison of time determine the depth of the pile in the ground. Sources of information taken into account in the examination 1.Method of examination and design of foundations and foundations for the overhaul, reconstruction and superstructure of buildings. M., stroiizdat, 1972, p. 14. 2. USSR Author's Certificate No. 713945, cl. E 02 D 33/00, 1978 (prototype).