SU1203196A1 - Apparatus for registering pile-driving variables - Google Patents

Description

one

The invention relates to construction and is intended to automate the processes of immersion when determining their carrying capacity.

The purpose of the invention is to provide an automatic registration of the height of the impact of the hammer and the number of impacts per dip of the pile.

FIG. 1 shows a general view of the device; in fig. 2 is a diagram of a recording device; in fig. 3 - a tape with the results of registration of parameters of pile driving.

The device contains a shock sensor 1 (SG-10 seismic receiver) mounted on a mast 2 copra, primary 3 and additional 4 contactless level sensors, control magnet 5, recorder 6, control panel 7 and power supply 8. The main and additional sensors 3 and 4 levels are mounted on the mast 2 copra on the length of the pile, one above the other, with a given step E, connected in parallel and included in the electrical circuit. The main gear of level 3 is fixed at a given distance L from the supporting surface 9 of the base copra machine. The value of the specified pitch step) and the distance L are the same and equal to 1m, which allows to fulfill the requirements of SNiP Sh-9-74 (paragraphs 8.9 and 8.10) for recording the number of hammer blows per meter of pile piling. the magnet 5 is strengthened on the body of the hammer 10 at the bottom of the headgear 11.

The recording device 6 includes a tape-driving mechanism 12 with an electric drive and a block 13 for stabilizing the speed of drawing the chart tape 14 and two identical electromagnets 15 and 16. The electromagnet 15 consists of a coil 17 and a spring-loaded core 18 with a needle 19 and an effective role of the punch. The spring 20 is compressed at one end attached to the body of the coil, the other to the shoulder of the core 18. The body of the coil is attached to the booth 21 with a hole for the needle. Bracket. A tape mechanism is attached to the body, the wall of which serves as a matrix. On the body of the coil at the level of the lower stroke shoulders

0

five

0

five

50

five

0

A core 22 is fixed to the core with a break contact connected to the coil of the electromagnet 15. The latter is connected via an electrical circuit to the shock sensor 1, the electromagnet 16 is connected to the output ends of the parallel-connected level sensors. An electrical control circuit of the device (not shown, Haj is assembled on the control panel 7 and is powered from the power source B. The headgear 11 is fixed on the test pile 23.

The device works as follows.

When driving the pile 23 at the moment of hitting the hammer 10, the shock sensor generates an electrical signal applied to the coil of the electromagnet 15, recording in the form of perforations information about the number of hammer blows 10. At the same time, the core 18 is drawn into the coil 17 and pierces the needle 19 with a constant The speed of the chart tape is 1 4 hole (perforation) N. At the end of the stroke, the core 18 acts as a shoulder on the path switch 22, the breaking contact of which breaks the electric power supply circuit of the electromagnet coil, de-energizing it. Spring 20 returns the core 18 with the needle 1.9 to its original position. Subsequent hammer blows perforate the perforations of N, Mi, etc.

As the pile 23 is submerged, the control magnet 5 moves with the hammer 10 along the mast 2 copra. When the magnet passes near the lower level sensor 4, corresponding to a certain pile driving depth, it triggers and gives an electrical signal to the electromagnet coil - 16, which marks the blocking depth h through the specified pitch (pitch) f. After the pile has been immersed to the depth C, the upper level 3 sensor is triggered and punching of the I2 perforation, etc. is carried out.

After the pile has been immersed, two rows of perforations characterizing the pile driving process will be pierced on the chart tape 14. The obtained information can be used when processing on a computer.

Maintaining an electromagnet for punching per orations into the recorder makes it possible to increase the reliability of the device as compared with the pen recorders under the conditions of vibration and three-way operation of the pile-driving unit.

The analysis of the results of recording the pile driving parameters is performed as follows.

The distance t between the perforations N and H-j is proportional to the height H of the impact part of the hammer. This follows from the following ratios of C.V.t. with.)

where V is the speed of drawing a diagram tape (/; t is the time between two blows

the hammer.

When the diesel hammer is operating, the impact part performs a straight-line motion with a constant acceleration, and the time i: is related to the altitude. H fall shock hammer part as follows

, r | st T2)

t - K

Where

- acceleration of free fall;

K - coefficient of proportionality, learning features of the diesel hammer and other factors. expressions (.1) and (2 J we have

E: 1KV

 IT

but

(, 3)

The total number of perforations on the D axis determines the total number of impacts when the pile is immersed. The number of holes between the horizontal axes drawn through the centers of the perforations hi and Kg is equal to the number of blows of the hammer N when the length of the pile of D. Gtina E piles is attached and tied to the height of the pile.

The use of the device allows to fulfill the requirements of documenting the height of the impact part of the hammer and the total number of hammer blows during the diving of the pile and per meter of diving.

The economic effect of the implementation of the proposed device is achieved by automating the monitoring process, which leads to a reduction in the cost of maintaining the operator who controls and manually records the parameters of the pile driving.

-Y / /// .W /// /// / y / Fig-1

sixteen

Editor P.Kossey

Compiled by R. Pogos n Tehred O. Netse

Order 8394/36

Circulation 648, Subscription

VNIIPI USSR State Committee

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

Branch GShP Patent, Uzhgorod, Proektna St., 4

FIG. Z

Fig.Z

Proofreader T. Kolb

Claims (2)

1. DEVICE FOR REGISTRATION OF PILET DRILLING PARAMETERS, including a level sensor with an electric circuit and a shock sensor installed on the copra mast, a magnet placed on the hammer head, a recording device and a control panel, characterized in that, in order to ensure automatic registration of the height of the impact parts of the hammer and the number of strokes to immerse the pile section, it is equipped with a tape drive with a stabilization unit for drawing speed of the chart tape and additional level sensors included in the electric kuyu parallel to the main circuit and fixed to the mast copra one above another at a predetermined pitch, and a recording unit configured to electromagnetic and limit _ About switches with disconnecting contacts mounted on a tape drive mechanism, with one electromagnet connected to the shock sensor and the other to the level sensor. 2. The device according to claim 1, wherein the opening contact of the path switch is included in the circuit of the electromagnet coil. SU p „1203196 eleven