JP2001337014A - Large-sized rock bed testing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a large-sized rock bed testing apparatus small-sized as compared with the size of a test object but constituted so as to be capable of holding a loading axis accurately. SOLUTION: The large-sized rock bed testing apparatus is equipped with four columns 1 vertically provided on a floor, a lower vertical frame 2 as the counterforce receiving stand arranged on the lower part within the columns 1, the upper vertical frame 3 fixed and arranged on the upper part within the columns 1, a vertical actuator 7 for grasping and pressing the test object S along with the lower vertical frame 2, a square annular horizontal frame 6 surrounding the columns 1 from the outside to be suspended through a plurality of suspending actuators 10 so as to be movable in horizontal and vertical directions, a pair of the horizontal actuator and a spacer 9 respectively provided on two opposed sides of the horozontal frame 6 in a protruded state to grasp and press both side surfaces of the test object S and the slide bearing 16 interposed between the horizontal actuator 8/spacer 9 and the horizontal frame 6 to make both of them movable relatively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel apparatus for testing large rocks, for example.

[0002]

2. Description of the Related Art In a rock test apparatus, a three-way principal stress control test and a water permeation test under pressure are performed by applying a horizontal two-way and a vertical three-way load to a sampled rock test specimen or a model rock model. It is a device to do. In the case of a three-direction (three principal stress) load testing device, the loading frame that serves as a reaction force to support the load received by the test specimen is fixed, and in the vertical direction, the reaction force is taken directly from the concrete floor surface, In the direction, the reaction force is taken on the vertical wall surface.
This structure is mainly used for small rock specimens and model rock models.

[0003]

However, in order to carry out a test for a large rock test specimen in order to approach a more realistic situation, a reaction force device is used.
A heavy and sufficiently solid foundation is required, and a very large vertical / horizontal frame is required. There is a disadvantage that it occupies a large space.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a large-sized test piece which is small in size for the size of a test piece and which can maintain a loading axis with high accuracy. A rock test apparatus is provided.

[0005]

In order to achieve the above object, the present invention relates to a plurality of columns erected on a floor, and a lower vertical frame as a reaction force receiving base disposed below the columns. An upper vertical frame fixedly arranged at the upper part of the column, a vertical actuator at the lower end of the upper vertical frame and pressurizing the test body between the lower vertical frame, and a suspended vertical support from the upper part of the column. A horizontal frame having a horizontal closed cross section, and a horizontal actuator protruding from the horizontal frame toward the test specimen so as to be orthogonal to each other and pressing a side surface of the test specimen. Therefore, in the present invention, the load in the horizontal direction and its reaction force are supported by the annular horizontal frame, so that the size of the device itself can be reduced.

In the present invention, the horizontal frame is:
It is preferable that the column is suspended from the upper part of the column via a plurality of suspension actuators so as to be movable horizontally and vertically. Therefore, in the present invention, it is possible to maintain the vertical loading axis for the test body.

Further, in the present invention, it is preferable that the horizontal actuator is attached to the horizontal frame via a slide bearing which enables the horizontal actuator to move in the direction of extension of the horizontal frame. Therefore,
According to the present invention, the horizontal actuator is relatively shifted by the slide bearing with respect to the horizontal movement of the horizontal frame, so that the horizontal loading axis of the test body can be held.

[0008]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a plan view of a rock test apparatus according to the present invention, and FIG. 2 is an explanatory sectional view taken along line AA of FIG.
In the figure, the test device is, for example, 4
A rectangular column 1 of books, a lower vertical frame 2 as a reaction force receiver installed on the lower floor surface, which is located on the inner side surrounded by each column 1, and fixedly disposed on the upper inside of each column 1 Upper vertical frame 3, four outriggers 4 protruding from the outer periphery of the corner of each column 1, four suspenders 5 suspended from each outrigger 4, and a rigid body connected to each suspender 5 And a horizontal frame 6 having a substantially rectangular annular shape formed of the following. The horizontal frame 6 is suspended and arranged so as to surround each column 1. The upper and lower sides of each column 1 are preferably connected by upper and lower vertical frames 3 and 2, but may be separate bodies.

At the lower end of the upper vertical frame 3, a vertical actuator 7 is integrated, and supports the specimen S between the vertical actuator 7 and the lower vertical frame 2. The horizontal frame 6
On the inside, a pair consisting of a horizontal actuator 8 and a spacer 9 as a reaction force receiving member is arranged facing each other in a state in which the specimen S is supported in two sides facing each other, that is, in the X and Y directions.

Each of the hanging members 5 is swingably supported by the outrigger 4 and the horizontal frame 6 via a pin 5a.
The suspension 10 is provided at a middle portion thereof. The actuator 10 hangs the horizontal frame 6 at a certain height, expands and contracts in accordance with the displacement in the vertical axis direction, and constantly tests the horizontal frame 6. The body S is held at the loading axis position.

Each of the actuators 7, 8, and 10 is composed of a hydraulic cylinder, and a hydraulic pressure is applied from an electro-hydraulic control system via a servo valve SV, and the vertical and X, X, A load in the Y horizontal direction is applied.

On the other hand, each of the actuators 7, 8, 1
A load cell 11 such as a load cell is disposed at the end of the plunger 0, and a displacement sensor 12 is disposed at each plunger, and a displacement amount corresponding to each compression or tensile load and the amount of protrusion of the plunger is measured. Is output to
The measured values in the X, Y, and Z directions according to the load of each part are read.

The suspension actuator 8 is driven and controlled by the electro-hydraulic control system based on these measured values so that the height position of the horizontal frame 6 is always kept constant at the vertical center axis of the specimen S.

Further, the distance between the specimen S and the vertical, the tip of the horizontal actuator 3, 8 and between the specimen S and the spacer 9
An oil film (not shown) and a ball seat 14 are interposed between the tip and the tip to make uniform the side load applied to the specimen S and reduce the friction.

In addition to the above, between the horizontal actuator 8 and the horizontal frame 6 and between the spacer 9 and the horizontal frame 6
, A slide bearing 16 is interposed. The slide bearing 16 is provided substantially at the center of the inside of the horizontal frame 6 and is movable in the extension direction with respect to the horizontal frame 6. 6 moves in parallel in the direction corresponding to the displacement difference via the pin 5a of the suspension tool 5, but at the time of movement, the slide bearing 16 causes the actuator 8 and the spacer 9 to relatively slide with the horizontal frame 6. , And has a function of holding a horizontal loading axis with respect to the specimen S.

Therefore, in the rock test apparatus having the above configuration, the horizontal frame 6 is always held at the height corresponding to the vertical loading axis position with respect to the test sample S by the suspension actuator 10, and the horizontal X , Y direction, the horizontal actuator 8 and the spacer 9 move relative to each other via the slide bearing 16.
Since it is held at the horizontal loading axis position relative to the test sample S, there is no measurement error due to these deviations, and accurate measurement values can be obtained.

In the above-mentioned embodiment, the horizontal frame according to the present invention has a substantially rectangular ring shape, but the horizontal frame is not limited to a horizontal closed cross section such as a hexagonal ring or a ring.

[0019]

As is clear from the above description, in the large rock test apparatus according to the present invention, since the horizontal frame takes a reaction force in two horizontal directions, the size of the test specimen is large. By being small in size and having a suspension actuator and a slide bearing, it is possible to accurately maintain the loading axis with respect to the test piece.

[Brief description of the drawings]

FIG. 1 is a plan view of a large rock test apparatus according to the present invention.

FIG. 2 is an explanatory view taken along the line AA of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Column 2 Lower vertical frame 3 Upper vertical frame 5 Suspension tool 6 Horizontal frame 7 Vertical actuator 8 Horizontal actuator 9 Spacer 10 Suspension actuator 16 Slide bearing

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenichiro Suzuki 4-640 Shimoseito, Kiyose-shi, Tokyo Inside Obayashi Technical Research Institute Co., Ltd. (72) Inventor Hideo Kinashi 2-152-2 Konan, Minato-ku, Tokyo Obayashi Corporation Tokyo head office F term (reference) 2G061 AA02 AB01 CA06 CB03 DA01 DA08 EA01 EA02 EB05

Claims (3)

[Claims] 1. A plurality of columns erected on the floor, a lower vertical frame as a reaction force pedestal disposed below the columns, an upper vertical frame fixedly disposed on the upper portion of the columns, A vertical actuator at the lower end of the upper vertical frame and pressurizing the test specimen between the lower vertical frame, a horizontal frame having a horizontal closed cross section suspended and supported from above the column, A large rock test apparatus, comprising: a horizontal actuator protruding toward a test body so as to be orthogonal to each other and pressing a side surface of the test body. 2. The large rock mass test according to claim 1, wherein the horizontal frame is suspended from the upper part of the column via a plurality of suspension actuators so as to be movable in a horizontal and vertical direction. apparatus. 3. The horizontal actuator according to claim 1, wherein the horizontal actuator is attached to the horizontal frame via a slide bearing that allows the horizontal actuator to move in the direction of extension of the horizontal frame. Large rock test equipment.