JPS58185814A - Tester for soil pressure - Google Patents

Abstract

PURPOSE:To simplify the measuring operation of soil pressures by a method in which plural thrusting plates are provided in a cylinder in a freely controlled manner and the pressure necessary for a jack device to push up each thrusting plate in soil is measured for measuring the pressures of surrounding soil of a shaft. CONSTITUTION:The first oil-pressure jack 12 consisting of a cylinder 13 and a ram 14 and the second oil-pressure jack 35 consisting of a cylinder 36 and a ram 37 are provided in the inside of a cylinder 1, and a soil pressure plate 16 is attached to the lower part of the cylinder 1. Also, plural thrusting plates 21 constituting a circle when projected are elusively attached to the lower part of the cylinder 1 through a rocking bar 19 and a link 29, and a pressure guage 40 is also attached to an oil delivery tube 38 connected to the cylinder 13. The cylinder 1 is inserted into a shaft (a) digged in the surface layer of the ground, each thrusting plate 21 is thrust into soil, and then the soil pressure plate 16 is pressed on the shaft bottom (b) by the first oil-pressure jack 12. Whereupon, the cylinder 13 goes up relatively, each thrusting plate 21 is raised to expand the inside diameter of the shaft (a), and the pressure to be applied then is displayed on the gauge 40. Thus, the soil pressure is measured.

Description

[Detailed description of the invention] The present invention relates to a Tonosho testing machine G for testing the Ueda of the ground, 1
A jacking device that operates the ram in the ``T'' direction is fixed to the center of the cylindrical body to be inserted into the vertical hole. In case f-1, an insertion plate is provided inside the cylindrical body that protrudes from the lower edge of the cylindrical body and is inserted into the hole wall of the vertical hole, and the insertion plate is freely controlled to come out and go out. 1゛ by the jacking device,
By pressing down the pressure plate, the insertion plate and the phloem body are raised relative to each other, and the pressure of the jacking device required for the relative rise is measured to measure the pressure around the vertical hole. It is suitable for transporting to the site and inserting the cylindrical body into the upper surface of the ground.
The object of the present invention is to provide an I-pressure tester that can be easily used by simply digging with a vertical hole excavator of about 0 mm or a vertical hole excavator. Of course, the dimensions of the m vertical hole are just one example.

An embodiment of the present invention will be described with reference to the accompanying drawings.

In the figure, l is a cylinder with a circular cross section, and in this example, the outer diameter / ! OMM, height is approximately 310 mm.

A flange J is fixed to the outer periphery of the top end of the cylinder, and a retaining cylinder 3 into which the end of the cylinder 13 of the first hydraulic jack 7.2 is inserted is inserted into the inner periphery of the top end. It is attached with a screw S to a disk q fixed to the F- side of the flange λ while covering the upper surface of the cylinder l.

The indigenous cylinder 3 has a cylindrical part t in its upper part that is in close contact with the inner circumference of the cylinder.
A horizontal plate 7 is integrally provided at the bottom of the circular @ part, and a fitting tube l of the cylinder 13 is provided in a hanging manner on the lower center surface of the horizontal plate 7, and the fitting tube f is provided around the fitting tube f. Several guide holes 9 in the upper direction are provided in the cylindrical body 1, and the same number of insertion plates 10 as the insertion plate 2/ to be described later are provided on the lower surface of the outer periphery in contact with the cylindrical body 1,
In addition, sending 1) 1. Install the oil pipe insertion hole /l v1. The first oil 1F jack 12 has a cylinder 13,
It consists of a ram/l protruding from the end of the cylinder 120, and the 1° end of the cylinder/3 is fitted and fixed into the fitting tube as described above. The cylinder 13 has a length that extends to near the lower edge of the cylinder l, and a ram/ram that protrudes downward from the center of the cylinder l.
A connecting hole 17 formed in the boss at the center of the upper surface of the dosho plate/A having an outer diameter approximately equal to the outer diameter of the cylindrical body l is fitted into the hemispherical part ts at the end of 4() so that it can rotate freely. Apply the fixed cover 11.

/9 is a large number of swingers arranged in an annular shape close to the inner circumferential surface of the cylindrical body 1 by fitting one end of 1 into each of the shaft support pieces 10 on the lower surface of the horizontal plate 7 and supporting them by a shaft binko 50. It is a rod, and the handle rod 22 of the insertion plate 1 is inserted and fixed to the upper end of the rod. Further, an operating cylinder 23 that operates downward is fitted onto the outer periphery of the cylinder 13, and inserted into the same number of rods 25 as the handle rods 22 formed from the lower end of the enlarged diameter part 2 formed at the upper end. Each of the many links 29 supported by the shaft pin 30 -
The pieces are connected to the inside of the lower part of each handle rod λ by a shaft pin 31. The operating cylinder 23 has a lower end of a pull spring 32 attached to the lower surface of the horizontal plate 7, which is connected to the flange part 23, and is joined to the lower surface of the fitting cylinder r by its spring elasticity. Each of the sliding rods 27 arranged in an annular manner and connected to the horizontal plate 70 is passed through the guide hole and protrudes to the side of the horizontal plate 70.
At one end, a circular pressure receiving plate 21 located at the bottom of the center of the disc.
to be fixed.

Each insertion plate -/ is raised by the lifting spring 32 of the actuating cylinder 23, and is moved inside the F side of the cylinder l by the swinging rod 19 which swings inwards as shown in Fig. 1 via the link 9. When the cylinder 23 is recessed, the lowering of the operating cylinder 23 as shown in Fig. 2 causes a protrusion on the toe side of the sieve l, and when it protrudes, it becomes a four-sided shape as shown in Fig. 3. As shown in Fig. q, both ends 2/a,, i! /b are arranged vertically and vertically alternately so that there is a slight overlap between the two, so as not to interfere with the immersion IF&.

A center hole 33 is provided in the disk l, and the λth oil [1:,
Attach the cylinder 3 of the jack 35 and pass the ram 37 through the center hole 33 as shown in FIG.

3F is inserted through the disc DA and the insertion hole l/, and then connects the first hydraulic jack/,! A pressure-resistant hose or a vibrator 39 connected to the oil supply and drainage pipe connected around the upper part of the cylinder 13.
Attach pressure measuring gauge qo to.

In addition, q/ is a return spring acting on the swing rod 19.

In this embodiment, the cylinder can be inserted almost tightly into the upper surface,
--Dig a vertical hole a with an inner diameter and depth suitable for bringing the double pressure plate/4 into flat contact with the water bottom as shown in the figure, and while inserting it as shown in Figure 1, press the cylinder 36 of the second hydraulic jack 3S. Pressure oil is sent to the ram 37 to push down the pressure receiving plate as shown in Fig. 1, and the sliding rod λ7 and the operating cylinder 23 are simultaneously pushed down against the elasticity of the lifting spring 32. At that time, each link 9 is displaced horizontally, and each sliding rod 19 and handle rod are swung vertically as shown in the figure with the shaft pin ○ as the center, and each insertion plate 2/ As shown in Figure 2.3, make the hole wall of the vertical hole a protrude just above the edge of the tube [4, /]. From yen fl
Penetrates into the soil due to its i-shaped overall shape.

At this time, IF oil is sent to the cylinder /3 of the first hydraulic jack 7.2 through the oil supply pipe 3t, and the 1-pressure plate /A is pressurized by the ram /44 toward the bottom of the water. When the time comes fl
11': Plate/l is the bottom a/I with insertion plate -l as standard.
JI+ 11: I do, but it's only for a short time,
Immediately, the cylinder 13 is relatively raised by -L, and the cylinder 1 is interlocked and raised via the retaining cylinder 3. For this reason, each insertion plate 2) is inserted into the hole wall C as shown in Figure S. r/,
L, expand the inner diameter of vertical hole a.

The total area of the protrusion/I) portion when the cylindrical body l of each piercing plate 2/ is projected as shown in Fig. 2 is known, the inner diameter of the vertical hole a is also known, and each piercing plate 21 is around vertical hole a]-
Since the pressure consumed by the first hydraulic jack 12 required for pushing the inside can be read by the pressure measurement gauge 4IO, the pressure change indicated by the gauge rto is read and l-
Measure pressure.

That is, if the ground around the upper surface where the vertical hole a is dug is hard, the rising resistance of each pressure receiving plate 2r will be large, and therefore the hydraulic pressure indicated by the pointer of the gauge qo will be large, and if the ground is soft, it will be small. This is a natural phenomenon. Incidentally, the pressure change of the seventh hydraulic jack/2 may be displayed using digital numbers.

The numerical value of the pressure change indicated by the pressure measuring gauge qo or the digital number tube and the hardness of the ground are converted by measurement, experiment, experience, etc., but the details thereof will be omitted in this embodiment.

As is clear from the above description, the present invention does not change the hardness of the ground to be measured, and the cylindrical body 14 is inserted into the soil in a state close to a close fit, and the Kamisho board/6 is placed at the bottom of the water. The preparatory work is simply to dig a vertical hole in contact with the cylinder l, and the hole wall is protected from the collapse of the 91 circumferential curved surface of the cylinder l. It is not necessary to make them protrude from the bottom surface all the way around the C hole wall; for example, they can be made to protrude independently from each other so as to receive equal rising resistance in all four directions. , which has the advantage of being able to measure the hardness of the ground near the local surface very easily.

[Brief explanation of the drawing]

Attachment (・1 drawing shows one embodiment of the present invention, 1X and 2 are central longitudinal cross-sectional views +E tri views, 3 is a cross-sectional view taken along line A-A in 1', and q is a Perspective view of insertion plate, 2/, No. S
The figure is a longitudinal cross-sectional front view of the center showing the state of the test. l-cylindrical body, t→inner disk za-fitting tube, data guide hole, /2→
1st hydraulic jack, / B - earth pressure plate, lq - rocking rod, 21
→Sashimi board 1.23 → Operating cylinder, core → Sliding rod 1.2ff →
Pressure receiving plate, -9→link, 3 no tension l-spring, 35→second
Hydraulic jack, 3t → oil supply and drainage pipe, qo → pressure measurement gauge Applicant Minoru Matsuo Applicant Takagi Fri - 36 Figure 2 Figure 3

Claims (1)

[Claims] A jacking device that operates the ram in the toe direction is fixed to the center of the cylindrical body to be inserted into the vertical hole bored in the above table. A pressure plate is installed, and a penetration plate is provided inside the cylinder that protrudes from the lower edge of the cylinder and inserts into the hole wall of the vertical hole, and can be freely controlled to come and go;
The insertion plate is inserted into the hole wall, and by pushing down the earth pressure plate with the jacking device, the insertion plate and the cylinder are relatively raised by L, and the pressure of the jacking device that is required to rise relatively is increased. An earth pressure testing machine characterized by measuring the pressure around a vertical hole.