SU1225894A1 - Apparatus for measuring dynamic parameters of driving a pile by hammer - Google Patents

Description

The invention relates to construction and is intended to determine the bearing capacity of pile foundations.

The purpose of the invention is to expand the measurement range.

The drawing shows the General scheme of the proposed device.

The device comprises a fixed housing with guides 2 and 3, in which respectively a movable carriage 4 with an element 5 for fixing pile failures and a spring-loaded carriage 6 with a spring 7 and recording with a clamp 8, a polyspast 9, a fixed support 10 with blocks II and 12, are placed the collar 13 and the diagram tape 14. The ends of the movable carriage are connected to the cable 15 and the cable 16, the cable 15 being passed through block 1 and connected to the collar 13. The spring 7 of the carriage 6 is fixed on the body 1.

The movable holder 17 of the polyspast 9 is fixed on the spring-loaded carriage 6, the stationary holder 18 is on the fixed case 1, and the cable 19 of the polyspast is passed through the block 11 and connected to the hammer 20. The collar 13 is fixed on the tested pile 21.

The device works as follows.

After driving the test pile 21 into the design position, the device is mounted. Near the pile 21 in the ground mass, the fixed support 10, the housing 1 is fixed and the structural elements of the device are mounted. On the pile 21 rigidly secured

A yoke 13 is attached to which the cable 15 of the movable carriage 4 is attached. The hammer of the pile-driving unit (not shown) fastens the cable 19 of the pulley 9. The diagram tape 14 is placed under the carriages 3 and 6 with the possibility of free movement of recording elements above it 5 and 8.

After the mounting of the device, the hammer 20 is lifted and blows are struck at the end of the pile through its cap (not shown), while the tape chart moves at a predetermined speed. With each lift of the hammer 20, the cable 19 pulls the carriage 6 to the pile and the recording element 8 fixes the height of the hammer and the number of strokes on the pile end 21. When striking the hammer 20, the pile 21 moves down and the pull 16 attracts the carriage 4 to itself, and the recording element 5 fixes on the chart tape 14 the amount of immersion of the pile 21. Then the pile 21 moves upwards and pulls the carriage 4 towards itself, and the recording element 5 again fixes on the tape 14 the upward movement of the pile 21. Consequently, the device on the chart tape 14 is in automatic In the recording mode, the response in time, incl. values of elastic and residual deformation of the pile 21.

Thus, the proposed device allows recording on the chart tape the main dynamic parameters of the test pile during its dynamic testing with a hammer.

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Editor G. Volkova

Ss -gavitel R.GTogos n Tehred I.Popovich

Order 2106/20 Circulation 6A1 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Proofreader M.Maksimishinets

Claims (1)

DEVICE FOR MEASURING DYNAMIC PARAMETERS OF PILET IMMERSION WITH A HAMMER, containing a stationary body with guides, a movable carriage with an element for fixing pile failures and a cable connected with a pile clamp, revealing that, in order to expand the measurement range, it is equipped with a stationary a support with blocks, a chain hoist, a spring-loaded carriage with a recording element, a chart tape and a guy, while the spring-loaded carriage is mounted on a fixed housing, the chain hoists are fixed respectively to the spring nennoy carriage and a stationary housing, chain hoist rope passed through a stationary support block and is connected to the hammer, the movable carriage coupled to the sling, and its cable is passed through the stationary block _on the support. F