JPH02275339A - Soil-bearing-power measuring apparatus - Google Patents

Abstract

PURPOSE:To measure soil bearing power accurately and continuously without damages of the ground by attaching freely expanding and contracting lifting device to a freely movable truck, and transferring the load of a weight to a grounding roller which is brought into contact with the ground surface and separated through a load gage and a rod. CONSTITUTION:When a lifting device 16 which is provided on a freely movable truck 8 is contracted, a grounding roller 12 is lowered with the total load of a weight 15, a load receiving stage 14, a load gage 13, a rod 11 and the like and brought into contact with the ground. Under this state, the truck 8 is moved at a speed V. Then, a displacement D of the rod is measured with a displacement gate 17, and a load W is measured with a load gage 13. Thus, a soil bearing power F which is the functions of the speed V, the displacement D and the load W is computed. With this constitution wherein a conical rod and the like are not required to penetrate into the ground, the soil bearing power is accurately measured continuously without damages of the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a soil bearing capacity measuring device for measuring the bearing capacity of the ground.

(Prior Art) Generally, when placing or transporting heavy objects, it is necessary to measure the bearing capacity of the ground in advance to confirm that the ground will not sink, and to ensure safe installation and transportation of the heavy objects.

If the ground is found to be soft, it will need to be reinforced.

Conventionally, human-powered penetration testers and equivalent weight vehicles have been used to measure soil bearing capacity.

The manual penetration tester is shown in Figure 6.

That is, the manual penetration tester 1 has a handle 5 attached via a force meter 4 to a penetration rod 3 having a conical cone 2 at the tip. When measuring the bearing capacity of the soil, the penetrating rod 3 is perpendicularly penetrated into the ground while supporting the handle 5 by the worker. The pushing force at this time is measured with a dynamometer 4, and the bearing capacity of the soil is calculated from the value of the dynamometer 4 and the cross-sectional area of the cone 2.

However, by measuring the soil bearing capacity using this manual penetration tester, it is not possible to accurately measure the bearing capacity of the ground. That is, when the cone 2 hits debris mixed in the topsoil, an erroneous result is obtained as if that point had a large bearing capacity.

Furthermore, in order to determine the soil bearing capacity of 1illJ at multiple locations, it is necessary to repeat the above operations many times. Therefore, it is impossible to continuously measure the soil bearing capacity at multiple locations, and the measurement work requires a lot of time.

On the other hand, the method of using an equivalent weight vehicle is a method in which an experimental vehicle having a weight equivalent to that of an actual heavy object is actually passed through to confirm the bearing capacity of the ground.

However, although this method does not cause damage to heavy objects even if there is a weak spot in the ground, the experimental vehicle may sink and become unable to move, so it is necessary to move the experimental vehicle using a crane truck. In this case, it is necessary to repair the damaged ground.

(Problems to be Solved by the Invention) As described above, in the conventional soil bearing capacity measurement, it has not been possible to accurately and continuously measure the soil bearing capacity without damaging the ground.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a soil bearing capacity measuring device that can accurately and continuously measure the bearing capacity of the soil without damaging the ground.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, in the present invention, a telescopic lifting device is mounted on a movable cart, and the load of the weight placed on the lifting device is transferred via a rod. This is transmitted to the ground rollers that come into contact with and separate from the ground.

(Function) With this configuration, the bearing capacity of the soil can be measured continuously and accurately without damaging the ground.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

As shown in FIG. 1, a truck 8 is comprised of a car body 6 and a plurality of wheels 7, such as pneumatic tires, rotatably attached to the lower part of the car body 6. Further, a rotation speed meter 9 is attached near the wheel 7 to measure the rotation speed of the wheel 7 when the movable trolley 8 moves. Note that 6a is a hook.

A rod 11 is disposed in the center of the vehicle body 6, supported by a guide 10, vertically penetrating the vehicle body 6, and movable up and down. A grounding roller I2 is attached to the lower end of this rod 11 so that it can come into contact with and separate from the ground as the rod 11 moves up and down. The ground contact area of the ground roller 12 is much smaller than that of the wheels 7. A load holder 14 is attached to the upper end of the rod 11 via a load meter 13. A predetermined weight 15 is placed on this load holder 14.

Furthermore, a plurality of elevating devices 1B, such as jacks, for elevating and lowering the load holder 14 by expansion and contraction are installed on the vehicle body 6. In addition, in FIG. 1, the lifting device 16 is retracted to lower the load holder 14, and the load of the weight 15 is transferred to the load holder 14. The grounding roller 12 is connected to the grounding roller 12 via the load cell 13 and the rod 11.
Indicates the state where is grounded. FIG. 2 shows that the lifting device 16 is extended to raise the load holder ■4, and the weight 15 is lifted.
The load of 14. The ground roller 12 is received by the wheels 7 via the lifting device 1B and the vehicle body 6, and shows a state where it leaves the ground.

Further, on the vehicle body 6 are a displacement meter 17 for measuring the amount of displacement of the rod 11, and a rotation speed meter 9. A computing device 18 connected to the load meter 13 and the displacement meter 17 is attached.

As shown in FIG. 3, this calculation device 18 includes a rotation speed meter 9.
An A/D converter 19 that converts the analog outputs of the load cell 13 and the displacement meter 17 into digital outputs, a timer 20,
A calculation unit 21 that calculates the soil bearing capacity based on the outputs of the D conversion unit 19 and the clock unit 20, a record display unit 22 that records and displays the output of this calculation unit 21, and the output of the calculation unit 21 are set to preset values. It also includes an alarm section 23 that issues an alarm when the vehicle has escaped.

Next, the effects of the configuration of this embodiment will be explained. First, when measuring the soil bearing capacity, as shown in Figure 1, the lifting device 1
6 is shortened. As a result, the grounding roller 12 is loaded with the weight 1
5. It is lowered by the total load of the load pedestal 14, load cell 13 and rod 11 and is grounded. In this state, the cart 8 is moved at a speed V. If the displacement of the rod 11 is D1 and the load m is W, then the bearing capacity F of the ground is V.

It is expressed as a function of D and W.

Therefore, the speed V is measured by the rotation speed meter 9, and the displacement mD is measured by the displacement meter 17.
Then, the load W is measured by each load cell 13, and the output data is input to the A/D converter 19 of the arithmetic unit 18. Then, the output of the A/D converter 19 and the output of the timer 20 are manually input to the calculation unit 21, where the bearing capacity F of the soil is continuously calculated. This soil bearing capacity F is displayed on the record display section 22 as shown in FIG. The figure shows changes in the soil bearing capacity F, with the vertical axis representing the soil bearing capacity F and the horizontal axis representing the distance traveled. Moreover, the broken line A is the limit soil bearing capacity F. It shows. In other words, the soil bearing capacity F is the critical soil bearing capacity F. Areas below this mean that ground reinforcement is required. For example, in area A, the soil bearing capacity is F
Reinforcement is required to increase l. When this region A is reached, the alarm section 23 operates and issues an alarm.

On the other hand, when the soil bearing capacity is not measured, as shown in Figure 2,
The lifting device 16 is extended to separate the grounding roller 12 from the ground.

In this embodiment, since there is no need to apply a load equivalent to an actual heavy load to the ground, the ground will not be damaged.

Furthermore, since the cart 8 and the grounding roller 12 are used, the bearing capacity of the soil can be accurately and continuously measured.

In addition, in this embodiment, each device was installed on the trolley 8, but
The vehicle 24 can also be used as a truck as shown in FIG.

〔Effect of the invention〕

As explained above, in the present invention, a telescopic lifting device is mounted on a movable cart, and the load of the weight placed on the lifting device is transferred via a load meter and a rod to a ground roller that contacts and separates from the ground. By transmitting the information, it is possible to provide a soil bearing capacity measuring device that accurately and continuously measures the bearing capacity of the soil without damaging the ground.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a soil bearing capacity measuring device showing an embodiment of the present invention, FIG. 2 is a block diagram showing the soil bearing capacity measuring device shown in FIG. Fig. 4 is a diagram showing the soil bearing capacity obtained by the soil bearing capacity 4 determination device shown in Fig. 1;
This figure is a block diagram of a soil bearing capacity measuring device showing another embodiment of the present invention, and FIG. 6 is a block diagram showing a conventional manual penetration tester. 6... Vehicle body, 6a... Hook, 7... Wheel, 8... Dolly, 9... Revolution meter, 10... Guide, 11... Rod, 12... Ground roller , 13...load cell,
14... Load holder, 15... Weight,
16... Lifting device, 17... Displacement meter, 1
8... Arithmetic device, 19... A/D conversion section, 20
...Timekeeping section, 21...Calculation section, 22...
・Record display section, 23... Alarm section, 24...
・Vehicle. Figure 1 Agent Patent Attorney Nori Ken Yudo Chika Ken Figure / Evening / 2 Figure

Claims (1)

[Claims] A movable trolley having wheels and a car body, a rotation speed meter for measuring the number of revolutions of the wheels, a lifting device telescopically attached to the car body, and a lifting device penetrating the car body vertically and allowing the lifting device to expand and contract. A rod that can be raised and lowered, a ground roller that is attached to the lower end of this rod and that can come into contact with and separate from the ground as the rod goes up and down, and is attached to the upper end of the rod via a load meter, and is placed on the ground when the lifting device is retracted. a load cradle that transmits the load of the weight to be applied to the ground roller through the load meter and the rod, and transmits the load of the weight to the vehicle body via the lifting device when the lifting device is extended; A soil bearing capacity measuring device comprising a displacement meter that measures the amount of displacement, and an arithmetic unit that calculates the bearing capacity of the soil from the outputs of the rotation speed meter, load meter, and displacement meter.