Grouting device of high-performance pressure testing machine for high-viscosity modified asphalt

Abstract

The invention discloses a grouting device of a high-performance pressure testing machine for high-viscosity modified asphalt, which comprises a pressure sealing box and a plurality of pressure heads, the pressure sealing box is formed by splicing a plurality of sealing box splicing pieces, the inner end of each pressure head is provided with a pressure plate, the pressure head at the bottom is provided with a grouting channel, and a ventilation gap is arranged at the splicing position of two adjacent sealing box splicing pieces. The high-viscosity modified asphalt is adopted for grouting reinforcement, the working efficiency can be improved, and the working quality can also be improved; by utilizing high-pressure gas for grouting, liquid slurry can be effectively injected into cracks of a rock sample, so that the test precision of the industry is improved, the pavement damage is favorably reduced, the pavement construction frequency is favorably reduced, and the effects of energy conservation and emission reduction are achieved; the pressure sealing box is not completely sealed and is provided with a ventilation gap, so that smooth grouting can be guaranteed, the height of the slurry level in the pressure sealing box can be accurately judged, and grouting can be stopped in good time; the device is high in test precision, and slurry return is reduced.

Description

Technical Field

[0001] The present invention relates to test equipment, and particularly to a pressure testing machine. Background Art

[0002] With the rapid development of social economy, as an important part of infrastructure construction, the durability and safety of road and bridge projects have received increasing attention. Durability not only affects the service life of roads and bridges, but also directly relates to the travel safety of the public and the economic interests of the country. Therefore, it is particularly urgent to research and develop new materials and processes to improve the durability of road and bridge projects.

[0003] In modern construction projects, as a revolutionary new building material, high-viscosity modified asphalt is gradually changing our perception of traditional concrete. This high-viscosity modified asphalt not only has the characteristics of high strength and high durability, but also performs well in workability, making the construction more convenient. Its core technology lies in the fine mix design, scientifically introducing high-range water reducers to reduce the moisture inside the asphalt, and at the same time increasing the proportion of fine aggregate and mineral admixture, mixing with concrete to improve the microstructure of the concrete. Such optimization treatment significantly improves the impermeability, frost resistance and corrosion resistance of the concrete, which is of great significance for improving the durability of road and bridge projects.

[0004] For the construction of rock pavements, when encountering poor geological bodies during the process, under the influence of excavation disturbance, these poor geological rocks will have large deformations or even collapse accidents. The technology of grouting reinforcement with high-viscosity modified asphalt is an effective and convenient support method. By carrying out advanced / lagged grouting in the rocks of poor geological bodies, the solidified slurry will re-cement these broken and unstable rocks together, fill and cement the fissures, prevent the further development of fissure rupture, thereby inhibiting the deep development of rock rupture and deformation, and effectively controlling the stability of the rocks.

[0005] The patent document with the application publication number of CN 119290562 A discloses a real-time grouting device based on a true triaxial three-rigid pressure testing machine, including a pressure sealing box in a rectangular structure, the pressure sealing box is composed of four sealing parts spliced together, each side wall of the pressure sealing box is provided with a rigid pressing plate, the rigid pressing plate includes a connecting pipe, the inner end of the connecting pipe is fixed with a pressing plate, a grouting pipe is arranged in the connecting pipe, and a grouting hole is arranged on the pressing plate, and one end of the grouting pipe is connected with the grouting hole. The above grouting device can be mounted on a three-rigid loading true triaxial testing machine to carry out real-time grouting tests, and at the same time, according to the designed test method, it can realize the complete restoration and simulation of the grouting reinforcement working conditions in deep engineering.

[0006] The existing technology has the following defects:

[0007] First, various existing high-strength, pressure-resistant, and wear-resistant rubber materials have been widely used in sealing devices in various extreme environmental conditions. However, there are still some problems when using high-strength, pressure-resistant, and wear-resistant rubber materials for sealing.

[0008] Second, a grouting permeability test was carried out on the pressure chamber sealed with a sealing strip. However, the test process separated loading and grouting, which did not meet the requirements of real-time grouting reinforcement. Summary of the Invention

[0009] The technical problem to be solved by the present invention: Based on the existing technology, improve the real-time grouting device so that the slurry can be fully injected into the cracks of the rock sample.

[0010] To solve the above technical problems, the present invention provides the following technical solution: A grouting device for a high-viscosity modified asphalt high-efficiency pressure testing machine, including a pressure sealing box and a number of pressure heads. The number of pressure heads is distributed on six surfaces of the pressure sealing box. The pressure sealing box is spliced by a number of sealing box splicing parts. The inner end of each pressure head is provided with a pressing plate, and the outer end of the pressure head is provided with a connecting plate. The pressing plate is located inside the pressure sealing box, and the connecting plate is located outside the pressure sealing box. At least one of the number of pressure heads is provided with a grouting channel. There is an air vent gap at the splicing position of two adjacent sealing box splicing parts. The air vent gap is located at the upper part of the side wall of the pressure sealing box. The top surface of the pressure sealing box is provided with an air inlet hole position.

[0011] According to the above technical solution, connect the six pressure heads to the corresponding components of the testing machine, and make the six surfaces of the rock sample respectively abut against the pressing plates of the six pressure heads. Then, control the six pressure heads by the testing machine to apply external forces to the rock sample in three directions of the X, Y, and Z axes for prestress loading. The purpose is to ensure that the rock sample is centered and will not loosen during the subsequent true triaxial test and the installation process of the pressure sealing box, which will affect the position of the rock sample. After that, carry out a true triaxial test on the rock sample. After the rock sample breaks and reaches the residual strength, stop loading the rock sample. Then, splice the number of sealing box splicing parts to form a pressure sealing box, and the pressure sealing box surrounds the rock sample. Then, grout the pressure sealing box through the grouting channel. At the same time, inject high-pressure gas into the pressure sealing box through the air inlet hole position. The high-pressure gas presses the slurry injected into the pressure sealing box from top to bottom. Therefore, the grouting machine connected to the grouting channel needs to drive the slurry into the pressure sealing box under high pressure. Under the action of the grouting machine and the high-pressure gas, the slurry can be effectively injected into the cracks of the rock sample, especially narrow cracks.

[0012] The high-pressure gas injected into the pressure sealing box through the air inlet hole position leaks out partially through the air vent gap to ensure the flow of gas and the continuous injection of slurry into the pressure sealing box. When the slurry leaks out through the air vent gap, the worker can know the liquid level of the slurry in the pressure sealing box. When the liquid level approaches the top of the pressure sealing box, stop grouting.

[0013] After the grouting is completed, after the liquid slurry has solidified for a sufficient time, the pressure sealing box is removed, and only the loading on the rock sample needs to be maintained. After the hardened slurry injected into the rock sample reaches a certain curing age, the testing machine is controlled to end the constant load stress level of the true triaxial testing machine on the rock sample, and the load on the rock sample is continuously increased until the rock sample ruptures to obtain the residual strength and complete the experiment.

[0014] As an option, the indenter located at the bottom surface of the pressure sealing box is provided with a grouting channel. The grouting channel includes an inner end grouting port provided on the pressing plate, an outer end grouting port provided on the connecting pipe of the indenter, and an internal pipe connecting the inner end grouting port and the outer end grouting port. Since the grouting channel is provided on the indenter at the bottom surface of the pressure sealing box, the liquid slurry can rise steadily in the pressure sealing box.

[0015] The six surfaces of the pressure sealing box are provided with indenter moving holes, and the connecting pipe of the indenter is fitted in the indenter moving holes, and the ventilation gap is located above the indenter moving holes. For two adjacent sealing box splicing parts, there is a splicing seam above the indenter moving holes, and this splicing seam forms the ventilation gap, and this splicing seam stops at the top of the pressure sealing box, that is, there is no splicing seam at the top of the pressure sealing box.

[0016] The pressure sealing box is formed by splicing four sealing box splicing parts, and each sealing box splicing part is provided with an arc-shaped structure that is spliced into an indenter moving hole.

[0017] The top surface of each sealing box splicing part is provided with an air inlet hole. There are a total of four air inlet holes on the top surface of the pressure sealing box, and the air inlet holes can be designed as threaded holes to facilitate the screwing connection of the air inlet pipe. The four air inlet holes can comprehensively press down the liquid slurry level in the pressure sealing box, so that the liquid level rises steadily under the action of high pressure, and the liquid slurry can fill into the cracks of the rock sample.

[0018] The side wall of each sealing box splicing part is provided with a long bolt clearance hole and a threaded connection hole, and two adjacent sealing box splicing parts are connected by a long bolt. The long bolt passes through the long bolt clearance hole of one sealing box splicing part and is screwed into the threaded connection hole of the other sealing box splicing part.

[0019] Compared with the prior art, the present invention has the following technical effects:

[0020] First, after the rock sample ruptures in the present invention, several sealing box splicing parts are spliced to form a pressure sealing box, and the pressure sealing box surrounds the rock sample. In this way, workers can accurately judge whether the rock sample ruptures and the degree of rupture; it can not only improve work efficiency but also improve work quality;

[0021] Second, the present invention uses high-pressure gas to press and inject the slurry into the pressure sealing box from top to bottom, which can effectively inject the slurry into the cracks of the rock sample, especially narrow cracks; in this way, the accuracy of the tests in this industry can be improved, which is conducive to reducing road surface damage and reducing the frequency of road construction, thus achieving the effect of energy conservation and emission reduction and responding to the country's call for green and low-carbon development;

[0022] Third, the pressure sealing box of the present invention is not completely sealed, but has a ventilation gap, which is located above the side wall of the pressure sealing box. In this way, the smooth progress of grouting can be ensured, and the height of the slurry surface in the pressure sealing box can be accurately judged, and grouting can be stopped in a timely manner; the test of the present invention has high accuracy and reduces backflow of the slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the grouting device of a high-viscosity modified asphalt high-efficiency pressure testing machine;

[0025] Figure 2 It is a partial explosion diagram of the grouting device of a high-viscosity modified asphalt high-efficiency pressure testing machine;

[0026] Figure 3 For Figure 2 A schematic diagram of another perspective;

[0027] Figure 4 It is a schematic diagram of the pressing plate 11 of the indenter approaching the inner wall of the pressure sealing box as much as possible;

[0028] Figure 5 It is a schematic diagram of the indenter at the bottom of the grouting device.

[0029] Explanation of symbols in the figure:

[0030] 10. Indenter; 11. Pressing plate; 12. Connecting plate; 13. Inner end grouting port; 14. Connecting pipe; 15. Outer end grouting port;

[0031] 20. Sealing box splicing piece; 21. Ventilation gap; 22. Air inlet position; 23. Arc structure; 24. Indenter moving hole position; 25. Long bolt smooth hole; 26. Threaded connection hole; 27. Long bolt. DETAILED DESCRIPTION OF THE INVENTION

[0032] Such as Figure 1 、 Figure 2, The grouting device of a high-viscosity modified asphalt high-efficiency pressure testing machine includes a pressure sealing box and several pressure heads 10. The several pressure heads are distributed on six faces of the pressure sealing box. The pressure sealing box is spliced by several sealing box splicing parts 20. The inner end of each pressure head is provided with a pressing plate 11, and the outer end of the pressure head is provided with a connecting plate 12. The pressing plate is located inside the pressure sealing box, and the connecting plate is located outside the pressure sealing box. At least one of the several pressure heads is provided with a grouting channel. There is an air vent gap 21 at the splicing part of two adjacent sealing box splicing parts. The air vent gap is located at the upper part of the side wall of the pressure sealing box. The top surface of the pressure sealing box is provided with an air inlet hole position 22.

[0033] As Figure 5 , the pressure head located at the bottom surface of the pressure sealing box is provided with a grouting channel. The grouting channel includes an inner end grouting port 13 arranged on the pressing plate 11, an outer end grouting port 15 arranged on the connecting pipe 14 of the pressure head, and an internal pipe connecting the inner end grouting port and the outer end grouting port.

[0034] As Figure 1 , six faces of the pressure sealing box are provided with pressure head movable hole positions 24, and the connecting pipe 14 of the pressure head 10 is fitted in the pressure head movable hole positions. The air vent gap 21 is located above the pressure head movable hole positions. For two adjacent sealing box splicing parts 20, there is a splicing seam above the pressure head movable hole position 24, and this splicing seam forms the air vent gap 21. This splicing seam stops at the top of the pressure sealing box, that is, there is no splicing seam at the top of the pressure sealing box.

[0035] The pressure sealing box is spliced by four sealing box splicing parts 20, and each sealing box splicing part is provided with an arc-shaped structure 23 that is spliced into the pressure head movable hole position.

[0036] The top surface of each sealing box splicing part 20 is provided with an air inlet hole position 22.

[0037] Combined with Figure 2 , Figure 3 , long bolt clearance holes 25 and threaded connection holes 26 are provided on the side walls of each sealing box splicing part 20. Two adjacent sealing box splicing parts are connected by long bolts 27. The long bolts pass through the long bolt clearance holes of one sealing box splicing part and are screwed into the threaded connection holes of the other sealing box splicing part.

[0038] Connect the connecting plates 12 of the six indenters 10 to the corresponding components of the testing machine, and make the six faces of the rock sample abut against the pressing plates 11 of the six indenters respectively. Then, control the six indenters by the testing machine to apply external forces to the rock sample in three directions of the X, Y, and Z axes for prestress loading. The purpose is to ensure that the rock sample is centered and will not loosen during the subsequent true triaxial test and the installation process of the pressure sealing box, which may affect the position of the rock sample. After that, conduct a true triaxial test on the rock sample. After the rock sample fractures and reaches the residual strength, stop loading the rock sample. Then, splice the four sealing box splicing parts 20 to form a pressure sealing box, and the pressure sealing box surrounds the rock sample. The sealing box splicing parts 20 have different sizes. The size of the sealing box splicing part to be selected is determined according to the position where the indenter 10 fractures the rock sample. Specifically, as Figure 4 shown, take the pressing plate 11 of the indenter 10 to be as close as possible to the inner wall of the sealing box splicing part 20. In this way, the rock sample can fill the pressure sealing box as much as possible.

[0039] After that, grout the pressure sealing box through the grouting channel. At the same time, inject high-pressure gas into the pressure sealing box through the air inlet hole position 22. The high-pressure gas presses the grout injected into the pressure sealing box from top to bottom. For this reason, the grouting machine connected to the grouting channel needs to drive the grout into the pressure sealing box under high pressure. Under the action of the grouting machine and the high-pressure gas, the grout can effectively be injected into the cracks of the rock sample, especially the narrow cracks.

[0040] The high-pressure gas injected into the pressure sealing box through the air inlet hole position 22 leaks out partially through the ventilation gap 21 to ensure the flow of the gas and the continuous injection of the grout into the pressure sealing box. When the grout leaks out through the ventilation gap, the worker can know the liquid level of the grout in the pressure sealing box. When the liquid level is close to the top of the pressure sealing box, stop grouting.

[0041] After the grouting is completed, wait until the grout has solidified for a sufficient time, then remove the pressure sealing box, and only maintain the loading on the rock sample. After the hardened grout injected into the rock sample reaches a certain curing age, control the testing machine to end the load-holding stress level of the true triaxial testing machine on the rock sample, and continue to increase the load on the rock sample until the rock sample fractures and obtains the residual strength, thus completing the experiment.

[0042] Since the grouting channel is arranged on the indenter 10 at the bottom surface of the pressure sealing box, the grout can rise steadily in the pressure sealing box.

[0043] The air inlet hole position 22 can be designed as a threaded hole to facilitate the screwing connection of the air inlet pipe. The four air inlet hole positions can comprehensively press down the liquid level of the grout in the pressure sealing box, so that the liquid level rises steadily under the action of high pressure, and the grout can fill into the cracks of the rock sample.

[0044] The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A grouting device for a high-viscosity modified asphalt high-performance pressure testing machine, comprising a pressure sealing box and a plurality of pressure heads (10), the plurality of pressure heads being distributed on six surfaces of the pressure sealing box, the pressure sealing box being formed by splicing a plurality of sealing box splicing pieces (20), a pressing plate (11) being provided at the inner end of each pressure head, a connecting plate (12) being provided at the outer end of the pressure head, the pressing plate being located inside the pressure sealing box, the connecting plate being located outside the pressure sealing box, at least one of the plurality of pressure heads being provided with a grouting channel, and characterized in that: A ventilation gap (21) is provided at the joint of two adjacent sealing box joint pieces. The ventilation gap is located at the upper part of the side wall of the pressure sealing box. An air inlet hole (22) is provided on the top surface of the pressure sealing box.

2. The grouting device of the high-viscosity modified asphalt high-performance pressure testing machine according to claim 1, characterized in that: The pressure head located at the bottom surface of the pressure sealing box is provided with a grouting channel.

3. The grouting device of the high-viscosity modified asphalt high-performance pressure testing machine as claimed in claim 2, characterized in that: The grouting channel comprises an inner grouting port (13) arranged on the pressure plate (11), an outer grouting port (15) arranged on the connecting pipe (14) of the pressure head, and an internal pipe connecting the inner grouting port and the outer grouting port.

4. The grouting device of the high-viscosity modified asphalt high-performance pressure testing machine according to claim 1, characterized in that: The six surfaces of the pressure sealing box are provided with pressure head movable holes (24), the connecting pipe (14) of the pressure head (10) is fitted in the pressure head movable holes, and the ventilation gap (21) is located above the pressure head movable holes.

5. The grouting device of the high-viscosity modified asphalt high-performance pressure testing machine according to claim 4, characterized in that: The pressure sealing box is formed by splicing four sealing box splicing pieces (20), and each sealing box splicing piece is provided with an arc structure (23) spliced ​​into a movable hole of a pressure head.

6. The grouting device of the high-viscosity modified asphalt high-performance pressure testing machine according to claim 5, characterized in that: An air inlet hole (22) is provided on the top surface of each sealed box assembly (20).

7. The grouting device of the high-viscosity modified asphalt high-performance pressure testing machine as claimed in claim 5, characterized in that: A long bolt hole (25) and a threaded connection hole (26) are provided on the side wall of each sealed box assembly (20). Two adjacent sealed box assembly parts are connected by a long bolt (27). The long bolt passes through the long bolt hole of one sealed box assembly part and is screwed to the threaded connection hole of another sealed box assembly part.

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