Water resistance testing device for chemical grouting material

Abstract

The utility model relates to the technical field of grouting reinforcement in tunnel engineering, and discloses a device for testing the water resistance of a chemical grouting material. The technical problems that in the prior art, a performance index test device is single, test result deviation is prone to occurring in multiple devices, the water resistance of grouting slurry under different dynamic water pressure working conditions cannot be simulated, and the grouting process of water-rich broken surrounding rock in an actual tunnel cannot be simulated are solved. The device comprises a barrel body, a bottom sealing steel plate and a water pressure diffusion assembly, a grouting hole is formed in the center of the bottom sealing steel plate and connected with a grouting pipe, and thermocouple sensors are arranged; the water pressure diffusion assembly is a cavity cylinder which is connected with a water injection pipeline, a water outlet hole and a water pressure detection sensor. The device can be used for simulating the water resistance of the grouting slurry under different dynamic water pressure working conditions, can be used for testing the diffusion distance, the anti-scouring property, the reaction temperature and the cementitious body permeability coefficient of the grouting material at the same time, and eliminates the error of the test result of the performance indexes by adopting a plurality of devices.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel engineering grouting reinforcement, in particular to a water resistance test device for chemical grouting materials. Background Art

[0002] Pre-grouting is the most common method for reinforcing poor geological structures and has been widely used in tunnel and underground engineering. The performance of the grouting material is a key factor influencing the grouting effect. Due to the complex and changing grouting environment, especially in geological environments with developed fissure water, the grouting slurry is often diluted by water flow, resulting in extremely poor reinforcement results and even instability of the surrounding rock. Ultimately, this is due to a lack of clear understanding of the grouting material's performance under the action of dynamic water. Performance testing is inseparable from a large number of indoor model tests. Domestic and foreign scholars have developed a number of grouting test devices, which have promoted the development of the grouting reinforcement field to a certain extent.

[0003] Chinese patent document 201420663860.9 in the prior art discloses a grouting diffusion test device, including a cylindrical penetration device and a monitoring system. The cylindrical penetration device includes a cylindrical steel pipe and an inlet cabin and an outlet cabin installed at both ends of the cylindrical steel pipe. A porous plate and a filter screen are provided between the inlet cabin, the outlet cabin and the cylindrical steel pipe. The inlet cabin and the outlet cabin are respectively provided with a slurry inlet and a slurry outlet connected to the interior of the cabin: a full-threaded compression screw is provided on the top of the outlet cabin extending therein; the inner wall of the cylindrical steel pipe is frosted and evenly coated with butter, and the cylindrical steel pipe is composed of several sections of single steel pipes nested with each other using steel ring welded quick clamp joints; each section of the single steel pipe is composed of two longitudinally symmetrical semicircular bodies buckled together.

[0004] Chinese patent document 201920114249.3 in the prior art discloses a grouting model test device, wherein the test box includes several box steel plates, which can be movably spliced ​​into a cubic closed structure test box. The test box is filled with sand during the simulation test; the test box includes a front, two side surfaces, a back, a bottom and a top; the front of the test box is provided with at least two single grouting pipes with reserved grouting holes for grouting, and the top surface of the test box is provided with ventilation holes; the top surface of the test box is also provided with a top cover for providing reaction force.

[0005] The aforementioned patents all focus on testing devices for a single performance indicator. Since the grouting reinforcement effect under water flow is affected by factors such as the grouting process and the grouting environment, using multiple devices for testing is bound to result in deviations in the test results. Furthermore, current devices cannot account for the water resistance of the slurry under different water pressures and dynamic water action. Furthermore, existing testing devices have low reuse rates and are cumbersome to clean and coring. Therefore, to study the effects of different water pressures and dynamic water action on the scour resistance, diffusion distance, and cementitious permeability of the slurry, a multi-indicator indoor testing device for grouting materials was designed. This device is simple to disassemble and easy to clean and coring. Summary of the Invention

[0006] In response to the above technical issues, the present disclosure provides a device for testing the water resistance of chemical grouting materials. This device addresses the existing technical issues of single performance indicator testing devices, multiple devices prone to test result deviations, an inability to simulate the water resistance of grouting slurries under different dynamic water pressure conditions, and an inability to simulate the grouting process of water-rich, crushed surrounding rock in actual tunnels. The device can be used to test slurry scour resistance, diffusion distance, body permeability, reaction temperature, and coring. It is simple to operate, easy to disassemble and clean, and capable of real-time monitoring of key grouting parameters.

[0007] According to one aspect of the present disclosure, a chemical grouting material water resistance test device is provided, comprising a test box, the test box comprising a barrel body, a bottom steel plate detachably installed on the bottom of the barrel body, and a water pressure diffusion component sealed and installed on the top; a number of drainage holes are evenly distributed throughout the bottom steel plate to simulate the process of groundwater outflow and slurry flushing in actual working conditions, a grouting hole is provided in the center of the bottom steel plate and a grouting pipe is connected, and a thermocouple sensor is arranged next to the grouting hole to monitor the slurry reaction temperature and the temperature change of the cement body in the barrel body; the water pressure diffusion component is a hollow cylinder, the top of the cavity cylinder is connected to the water injection pipe, and the bottom is evenly distributed with water holes to simulate the dynamic water pressure; the side wall of the cavity cylinder is penetrated by a mounting hole, and a water pressure detection sensor is installed in the mounting hole through a sealing strip to monitor the water pressure flowing through the barrel body device.

[0008] In some embodiments of the present disclosure, the thermocouple sensor is welded to the bottom steel plate.

[0009] In some embodiments of the present disclosure, a circle of silicone sealing strip is arranged on the outer edge of the cavity cylinder, a layer of butter is applied on the outer side of the silicone sealing strip, and the silicone sealing strip is sleeved on the barrel body.

[0010] In some embodiments of the present disclosure, the barrel body includes two arc-shaped steel plates staggered together to form a barrel body structure, two square steel plates are welded to the edges of both sides of the arc-shaped steel plate, reinforcing angle steel is installed at the connection between the arc-shaped steel plate and the square steel plate, bolt holes are drilled on the square steel plate, and the two arc-shaped steel plates are connected by bolts.

[0011] In some embodiments of the present disclosure, a circle of silicone sealing strip is arranged on the outer edge of the bottom steel plate, a layer of butter is applied on the outer side of the silicone sealing strip, and the strip is supported on four legs; the legs are composed of four truncated cone-shaped iron blocks with a small upper part and a large lower part, and the bottom of the legs is placed on the ground.

[0012] In some embodiments of the present disclosure, a permeability coefficient measuring assembly is also included, which is installed at the bottom of the test box after the slurry solidifies to measure the permeability coefficient of the cement body. The permeability coefficient measuring assembly includes a cylindrical cavity and a measuring glass tube. The top surface of the cylindrical cavity is uniformly provided with seepage holes, and the bottom surface is connected to a measuring glass tube with a scale.

[0013] The beneficial effects of the present invention are:

[0014] 1. The top water pressure diffusion device and water pressure sensor can be used to simulate the water resistance of grouting slurry under different dynamic water pressure conditions. By applying water pressure at the top and grouting at the bottom, the grouting process of water-rich broken surrounding rock in an actual tunnel can be more realistically simulated. The test device can simultaneously test the diffusion distance, scour resistance, reaction temperature, and permeability coefficient of the grouting material, eliminating the error in the test results of the above performance indicators using multiple devices. The test device is equipped with silicone sealing strips on the side edges of the top water pressure diffusion device and the bottom steel plate, and the device has good sealing performance. The test device can obtain a complete grouting reinforcement sample core for the uniaxial compressive strength test of the cement body. The device is easy to disassemble, simple to operate, and easy to clean.

[0015] 2. The barrel is formed from two staggered curved steel plates, enhancing structural stability and strength while reducing welding stress and deformation. Welding square steel plates and installing reinforced angle steel further enhance the barrel's rigidity and stability. Bolting the two curved steel plates together facilitates disassembly and assembly, maintenance, and cleaning, ensuring the barrel will not deform or damage in high-pressure water environments.

[0016] 3. The water pressure evenly distributed through the water outlet truly simulates the dynamic water pressure in actual working conditions. The water pressure detection sensor can monitor the water pressure changes in the barrel in real time and provide accurate data support. By measuring the water flow rate recorded by the glass tube, the permeability coefficient of the cement can be accurately calculated and the material's anti-permeability performance can be evaluated. Thermocouple sensors provide real-time temperature data to help researchers understand the temperature changes during the slurry reaction and optimize the grouting process. The double sealing measures of silicone sealing strips and butter ensure the sealing between the barrel and the water pressure diffusion component during the test, prevent leakage, and improve the accuracy of the experimental results. The leg design provides stable support, ensuring the smooth operation of the device during the test and reducing external interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a schematic diagram of the structure of the grouting material water resistance test device;

[0018] Figure 2 for Figure 1 Middle AA plane section view;

[0019] Figure 3 for Figure 1 Middle BB plane cross-sectional view;

[0020] The names of the components in the figure are: 1. Test box; 2. Bottom steel plate; 3. Support legs; 4. Square steel plate; 5. Bolts; 6. Arc steel plate; 7. Water pressure diffusion assembly; 8. Water injection pipe; 9. Permeability coefficient measurement assembly; 10. Measuring glass tube; 11. Water pressure detection sensor; 12. Thermocouple sensor; 13. Drain hole; 14. Grouting hole; 15. Water outlet hole; 16. Cylindrical cavity; 17. Seepage hole. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention. Example 1

[0022] This example discloses a chemical grouting material water resistance test device, see Figures 1 to 3 ; It includes a test box body 1, which includes a barrel body. A bottom steel plate 2 is detachably installed at the bottom of the barrel body, and a water pressure diffusion component 7 is sealed and installed at the top; a number of drainage holes 13 are evenly distributed throughout the bottom steel plate 2 to simulate the process of groundwater outflow and slurry flushing in actual working conditions. A grouting hole 14 is set in the center of the bottom steel plate 2 and a grouting pipe is connected. A thermocouple sensor 12 is arranged next to the grouting hole 14 to monitor the slurry reaction temperature and the temperature change of the cement body in the barrel body; the water pressure diffusion component 7 is a hollow cylinder, the top of the cavity cylinder is connected to the water injection pipe 8, and water outlet holes 15 are evenly distributed at the bottom to simulate dynamic water pressure; a mounting hole is set throughout the side wall of the cavity cylinder, and a water pressure detection sensor 11 is installed in the mounting hole through a sealing strip to monitor the water pressure flowing through the barrel body device.

[0023] The thermocouple sensor 12 is welded on the bottom cover steel plate 2 .

[0024] A circle of silicone sealing strip is arranged on the outer edge of the cavity cylinder, a layer of butter is laid on the outer side of the silicone sealing strip, and the silicone sealing strip is sleeved on the barrel body.

[0025] The barrel body includes two arc-shaped steel plates 6 staggered together to form a barrel structure. Two square steel plates 4 are welded to the edges of the arc-shaped steel plate 6. Reinforcement angle steel is installed at the connection between the arc-shaped steel plate 6 and the square steel plate 4. Bolt holes are drilled on the square steel plate 4 and the two arc-shaped steel plates 6 are connected by bolts 5.

[0026] A circle of silicone sealing strip is laid on the outer edge of the bottom steel plate 2, a layer of butter is laid on the outside of the silicone sealing strip, and it is supported on four legs 3; the legs 3 are composed of four frustum-shaped iron blocks with small upper parts and large lower parts, and the bottom of the legs 3 is placed on the ground.

[0027] It also includes a permeability coefficient measuring component 9 installed at the bottom of the test box 1 after the slurry solidifies to measure the permeability coefficient of the cement body. The permeability coefficient measuring component 9 includes a cylindrical cavity 16 and a measuring glass tube 10. The top surface of the cylindrical cavity 16 is uniformly provided with water seepage holes 17, and the bottom surface is connected to the measuring glass tube 10 with a scale.

[0028] The outer diameter of the barrel structure is 500mm, the curved steel plate 66 is 500mm high and the wall thickness is 10m.

[0029] Silicone sealing strips are evenly distributed around the side edges of the closed steel plate. During installation, a layer of butter is applied to the four legs 33, and then the assembled barrel structure is hoisted on the bottom steel plate 22. Drain holes 13 are evenly distributed on the bottom steel plate 22 to simulate the process of groundwater outflow and slurry flushing in actual working conditions, and a grouting hole 14 is left in the center of the bottom steel plate 22 to enable grouting simulation tests from the bottom grouting pipe. After the barrel structure and the bottom steel plate 2 are installed, gravel particles or other rock and soil are filled into the barrel structure, and then the water pressure diffusion device 7 brushed with butter is installed on the barrel structure. The top of the water pressure diffusion device 7 is connected to the water injection pipe 8, and the bottom is evenly distributed with water outlet holes 15 to simulate the dynamic water pressure. The cavity cylinder needs to be full of water.

[0030] During the working process, the device is assembled: the bottom steel plate 2 is installed: a circle of silicone sealing strips is laid on the outer edge of the bottom steel plate 2, and a layer of butter is applied. The bottom steel plate 2 is placed on the four legs 3, and the barrel body is assembled: the two arc-shaped steel plates 6 are staggered and spliced ​​to form a barrel structure. Square steel plates 4 are welded to the edges of both sides of the arc-shaped steel plate 6, and reinforcing angle steels are installed at the connection. The two arc-shaped steel plates 6 are connected together by bolts. The barrel body is hoisted: the assembled barrel structure is hoisted on the bottom steel plate 2. Filling material: gravel particles or other rock and soil are filled into the barrel structure to simulate actual geological conditions. The water pressure diffusion component 7 is installed: the cavity cylinder brushed with butter is installed on the barrel structure. The water injection pipe 8 is connected, and the cavity cylinder is kept full of water during the test. Grouting: Grouting is carried out through the grouting holes 14 on the bottom steel plate 2 to simulate the grouting process in actual working conditions.

[0031] Start the test: Grouting: Inject chemical grouting material into the barrel through the grouting hole 14, and observe and record the slurry flow during the grouting process. Monitor the slurry reaction temperature and the temperature change of the cement body through the thermocouple sensor 12. Water pressure simulation: Inject water into the cavity cylinder through the water injection pipe 8 to make it full of water. Water flows into the barrel through the water outlet 15 at the bottom of the cavity cylinder to simulate the dynamic water pressure. The water pressure change in the barrel is monitored in real time through the water pressure detection sensor 11. Permeability coefficient measurement: After the slurry solidifies, install the permeability coefficient measurement component 9. Inject water into the barrel through the water outlet 15 on the top surface of the cylindrical cavity 16 to observe the seepage of water through the cement body. Record the water flow through the measuring glass tube 10 with a scale and calculate the permeability coefficient of the cement body.

[0032] Although some preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including all changes and modifications that fall within the scope of the present invention as well as the preferred embodiments.

[0033] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of this application and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A chemical grouting material water resistance test device, characterized by: The test box comprises a barrel body, a bottom steel plate is detachably installed on the bottom of the barrel body, and a water pressure diffusion component is sealed and installed on the top; a number of drainage holes are evenly distributed through the bottom steel plate to simulate the process of groundwater outflow and slurry flushing in actual working conditions, a grouting hole is set in the center of the bottom steel plate and a grouting pipe is connected, and a thermocouple sensor is arranged next to the grouting hole to monitor the slurry reaction temperature and the temperature change of the cement body in the barrel body; the water pressure diffusion component is a hollow cylinder, the top of the cavity cylinder is connected to the water injection pipe, and the bottom is evenly distributed with water holes to simulate the dynamic water pressure; the side wall of the cavity cylinder is penetrated by a mounting hole, and a water pressure detection sensor is installed in the mounting hole through a sealing strip to monitor the water pressure flowing through the barrel body device.

2. The chemical grouting material water resistance test device according to claim 1, characterized in that: The thermocouple sensor is welded on the bottom steel plate.

3. The chemical grouting material water resistance test device according to claim 1, characterized in that: A circle of silicone sealing strip is arranged on the outer edge of the cavity cylinder, a layer of butter is laid on the outer side of the silicone sealing strip, and the silicone sealing strip is sleeved on the barrel body.

4. The chemical grouting material water resistance test device according to claim 1, characterized in that: The barrel body includes two arc-shaped steel plates staggered together to form a barrel body structure, two square steel plates are welded to the edges of the two sides of the arc-shaped steel plate, reinforcing angle steels are installed at the connection between the arc-shaped steel plate and the square steel plate, bolt holes are drilled on the square steel plate, and the two arc-shaped steel plates are connected by bolts.

5. The chemical grouting material water resistance test device according to claim 1, characterized in that: A circle of silicone sealing strip is laid on the outer edge of the bottom steel plate, a layer of butter is laid on the outer side of the silicone sealing strip, and it is supported on four legs; the legs are composed of four frustum-shaped iron blocks with small upper parts and large lower parts, and the bottom of the legs is placed on the ground.

6. The chemical grouting material water resistance test device according to claim 1, characterized in that: It also includes a permeability coefficient measuring component installed at the bottom of the test box after the slurry solidifies to measure the permeability coefficient of the cement body. The permeability coefficient measuring component includes a cylindrical cavity and a measuring glass tube. The top surface of the cylindrical cavity is uniformly provided with seepage holes, and the bottom surface is connected to a measuring glass tube with a scale.

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