CN211292658U

CN211292658U - Rock freezing and thawing box

Info

Publication number: CN211292658U
Application number: CN201921875191.0U
Authority: CN
Inventors: 李彦志; 张雷; 张帅
Original assignee: Shandong University of Science and Technology
Current assignee: Shandong University of Science and Technology
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-08-18
Anticipated expiration: 2029-11-04

Abstract

The utility model relates to a rock freeze thawing box, this experimental apparatus wholly are cylindricly, mainly include metal covering, metal barrel, capsule, rubber water proof cover, rubber water proof pad, manual valve. The utility model discloses the metal lid at device both ends passes through the screw thread and is connected with metal cylinder. The capsule is arranged in the metal cylinder body and is communicated with a manual valve outside the cylinder body, and the inflow and outflow of liquid in the capsule are controlled through the manual valve. The rubber water-isolating sleeve is arranged on the inner side of the capsule and forms a closed water-isolating space with the water-isolating pad at the lower end of the thread of the metal cover, so that a freeze-thaw experiment with confining pressure is conveniently carried out in the water-isolating space. The utility model discloses simple structure, reasonable in design uses convenient operation, can realize the freeze thawing state test of a plurality of conditions simultaneously, and the practicality is strong.

Description

Rock freezing and thawing box

Technical Field

The utility model relates to a rock freeze thawing test device technical field, concretely relates to rock freeze thawing box.

Background

With the increasing depth of coal mining, more and more projects find that water seepage possibly still occurs in the deep part of a coal mine kilometer deep shaft after grouting, and the water seepage mainly comes from the surface seepage of micro-pores and micro-cracks of deep sedimentary sandstone. Because the rock pore is small, ordinary chemical grout is difficult to inject into the rock, so the rock pore channel cavity expansion grouting research has important significance. The cavity expansion work can be completed by freezing and thawing of rock pore water, but the cavity expansion effect still needs a great amount of laboratory tests and field test research.

Disclosure of Invention

The utility model aims to provide a rock freezing and thawing box which is mainly used for rock freezing and thawing cavity expansion laboratories and engineering field research and can realize freezing and thawing cavity expansion experiments under various conditions. The freezing and thawing cavity expanding test device is simple in structure, reasonable in design, convenient to use and operate, capable of achieving freezing and thawing cavity expanding tests under multiple conditions and high in practicability.

A rock freezing and thawing box is composed of a metal cover, a metal cylinder body, a capsule, a rubber water-isolating sleeve and a manual valve, and is characterized in that the steel cylinder is a hollow cylinder, threads are arranged inside the upper bottom surface and the lower bottom surface, the manual valve is arranged at the symmetrical positions of the left side and the right side, the capsule is arranged inside the metal steel cylinder, and the rubber water-isolating sleeve is arranged on the inner side of the capsule. Wherein the metal cover is connected with the metal cylinder body through threads, and the bottom of the metal cover is provided with a water-proof cushion.

As an improvement, Q345D low-temperature resistant steel is adopted as the metal material.

As an improvement, the capsule material adopts polymethyl methacrylate.

As an improvement, a cylindrical space with the diameter of 130mm and the length of 100mm is reserved inside the metal cylinder.

The utility model has the advantages that: the appearance of the rock freezing and thawing box is cylindrical, so that the phenomenon of stress concentration in the freezing and thawing or pressurizing process can be effectively avoided. The water-proof pad at the bottom of the metal cover and the rubber water-proof sleeve form a sealed space, so that liquid in rocks can be prevented from seeping out, the expected freeze-thawing cavity expansion effect is ensured to be achieved, and the rubber water-proof sleeve can protect the capsule from being punctured. The freeze-thaw box is provided with capsules to provide confining pressure for the rock during the freeze-thaw cycle to simulate the freeze-thaw state in the deep site. When large-scale freeze thawing equipment is inconvenient to carry in an engineering field, the machine oil in the capsule can be changed into the antifreezing agent, and the rock is subjected to simple field freeze thawing experiments by circulating the antifreezing agent. After the experiment is processed at low temperature, the internal pressure of freeze thawing can be basically unchanged only by closing a valve outside the capsule, and repeated pressurization is not needed.

Drawings

FIG. 1 is a schematic cross-sectional view of a rock freezing and thawing box

FIG. 2 is a schematic diagram of a rock freezing and thawing box

Reference numerals: (1) a metal cover; (2) a metal cylinder; (3) a capsule; (4) a rubber water-separating sleeve; (5) a rubber water-proof cushion; (6) and (4) a manual valve.

Detailed Description

As shown in figure 1, the device of the utility model is composed of a metal cover (1), a metal cylinder body (2), a capsule (3), a rubber water-proof sleeve (4), a rubber water-proof pad (5) and a manual valve (6). The metal cover (1) and the metal cylinder body (2) are made of Q345D low-temperature resistant steel, wherein the metal cover (1) is connected with the metal cylinder body (2) through threads. The capsule (3) and the rubber water-isolating sleeve (4) are both arranged in the metal cylinder body (2); wherein the capsule (3) is connected with a manual valve (6), and the manual valve (6) is used for controlling the inflow and outflow of liquid in the capsule.

As shown in fig. 1 and 2, the rock assembling method in the laboratory is as follows: firstly, mounting a metal cover (1) at the bottom of a metal cylinder body (2) by using a wrench, placing a rock sample, and mounting a top metal cover (1); and (3) respectively connecting the manual valves (6) on the two sides of the metal cylinder (2) with the liquid inlet pipe and the liquid outlet pipe, closing the manual valves (6) after the regulated proper confining pressure is achieved, and putting the box into a freeze thawing machine to start a test.

The method for assembling the rock on the engineering site comprises the following steps: firstly, mounting a metal cover (1) at the bottom of a metal cylinder body (2) by using a wrench, placing a rock sample, and mounting a top metal cover (1); tightly wrapping the metal cylinder (2) by using a heat-insulating material, respectively connecting the manual valves (6) on two sides of the metal cylinder (2) with the liquid inlet pipe and the liquid outlet pipe, and adding the antifreeze in the capsule to a test confining pressure after the antifreeze in the capsule is cooled to a test temperature to start a test.

Claims

1. A rock freezing and thawing box, the device comprising: the device comprises a metal cover (1), a metal cylinder (2), a capsule (3), a rubber water-insulating sleeve (4), a rubber water-insulating pad (5) and a manual valve (6); the capsule is characterized in that the metal cylinder (2) is a cylinder with a hollow interior, threads are arranged on the inner parts of the upper bottom surface and the lower bottom surface, a manual valve (6) is arranged at the symmetrical positions of the left side and the right side, the capsule (3) is arranged in the metal cylinder (2), and the rubber water-separating sleeve (4) is arranged on the inner side of the capsule; wherein the capsule is ring-shaped, the inner diameter of the ring is 110mm, and the outer diameter is 130 mm.