High-pressure grouting demolding test system and method

Abstract

The invention belongs to the field of geotechnical engineering grouting reinforcement tests, and particularly relates to a high-pressure grouting demolding test system and method. Comprising a grouting mold and a demolding device; the grouting mold comprises an integrally formed outer mold and an inner mold spliced in the outer mold, the outer shape of the inner mold is matched with that of the outer mold, the inner shape of the inner mold is determined according to a to-be-prepared test piece, and grouting is performed after a to-be-grouted stone body is assembled in the inner mold and sealed; the demolding device comprises a telescopic ejector rod and a mold clamping plate, the grouted inner mold and outer mold combination is placed in the demolding device, the mold clamping plate clamps the outer mold, the telescopic ejector rod is controlled to achieve demolding of the grouted inner mold, the spliced inner mold is dismantled, and demolding is achieved. The mold can bear enough grouting pressure and can be repeatedly used, and the defects of coring disturbance, inconvenient mold operation and the like in the prior art are overcome.

Description

Technical Field

[0001] The invention belongs to the technical field of geotechnical engineering grouting reinforcement test, and in particular relates to a high-pressure grouting demoulding test system and method. Background Art

[0002] Grouting refers to the use of grouting equipment to inject slurry (including main materials, diluents, admixtures, etc.) into broken rock and soil, and cracks in soft and loose strata. After a period of time, the slurry condenses into a stone body, thereby consolidating the broken and loose rock and soil into a complete whole, thereby improving the bearing capacity, stability, and impermeability of the surrounding rock of the underground cavern.

[0003] The main purpose of the grouting reinforcement test device is to obtain grouting stone body samples to test the effect of the sample after grouting. Therefore, the mold design of the grouting reinforcement device must be carried out according to the grouting principle, implementation method, and effect. At present, there is no unified standard and style for indoor high-pressure grouting devices in geotechnical engineering, and the main shortcomings are as follows: First, the grouting device is not equipped with a standard specimen mold. After grouting, the stone body still needs to be drilled to obtain a standard specimen, which disturbs the specimen and the grouting process is not practical; second, it is difficult to remove the specimen, and the disassembly method is simple and crude. The disassembly of some molds adopts manual impact pressurization, and the pressure is difficult to control accurately. The specimen is easily damaged, which affects the reliability of the experimental results. Summary of the invention

[0004] The purpose of the present invention is to solve the problems raised in the background technology and to provide a high-pressure grouting demoulding test system and method, which can efficiently prepare grouting stone body specimens.

[0005] In order to achieve the purpose of the present invention, the present invention discloses a high-pressure grouting demoulding test system, including a grouting mold and a demoulding device; the grouting mold includes an integrally formed outer mold and an inner mold spliced ​​and arranged in the outer mold, the outer shape of the inner mold matches the outer mold, the inner shape of the inner mold is determined according to the test piece to be prepared, and the stone body to be grouted is assembled in the inner mold and sealed before grouting;

[0006] The demoulding device includes a telescopic ejector rod and a mold clamp. The inner and outer mold combination after grouting is placed in the demoulding device. The mold clamp clamps the outer mold. The telescopic ejector rod is controlled to realize the demoulding of the grouting inner mold, and the spliced ​​inner mold is removed to realize demoulding.

[0007] Furthermore, the grouting mold also includes an upper cover plate, a lower cover plate, a tension bolt rod and a tension bolt;

[0008] The upper cover plate is equipped with a slurry outlet valve and a slurry outlet pipe, and the lower cover plate is equipped with a slurry inlet valve and a slurry inlet pipe; the upper cover plate and the lower cover plate are sealed and connected to the upper and lower ends of the outer mold respectively, and the outer circumferences of the upper cover plate and the lower cover plate are evenly distributed with tension bolt holes, and the tension bolt rods pass through the tension bolt holes of the upper and lower cover plates and are fastened by the tension bolts.

[0009] Furthermore, the outer mold is a stainless steel cylindrical casting with a thickness of 15±3mm. Grooves with a width of 3±0.5mm are respectively provided at the joints of the upper cover plate and the lower cover plate. The outer mold is provided with an annular protrusion matching the groove, and a replaceable rubber ring is prefabricated at the bottom of the groove; the thickness of the upper cover plate and the lower cover plate are both 18±3mm.

[0010] Furthermore, the inner mold includes two semi-cylinders, and the joint between the two semi-cylinders is tooth-shaped.

[0011] Furthermore, the inner mold cavity after the two semi-cylinders are spliced ​​together is cylindrical or cubic.

[0012] Furthermore, an outer mold handle is provided outside the outer mold.

[0013] Furthermore, the demoulding device also includes a power pump, a pressure controller, a switch valve, a pressure pipe, a mold bottom gasket, and a demoulding bracket and base;

[0014] The inner and outer mold assembly is placed on the demoulding bracket, and a mold bottom gasket is provided below the inner and outer mold assembly, and the size of the mold bottom gasket matches the size of the inner mold; there are two mold clamps arranged opposite to each other, and the two mold clamps are arranged outside the inner and outer mold assembly and clamp the outer mold;

[0015] The pressure pipe is connected to the telescopic ejector rod, and the power pump controls the telescopic ejector rod to act on the test piece through the pressure controller, and cooperates with the mold clamp to realize demoulding; the switch valve is located on both sides of the pressure controller; the base is located at the bottom and is used to fix the telescopic ejector rod and the demoulding bracket.

[0016] In order to achieve the purpose of the present invention, the present invention also discloses a high-pressure grouting demoulding test method comprising the following steps:

[0017] Step 1: Clean and dry the equipment;

[0018] Step 2, install the outer mold and inner mold of the test piece mold; install the outer mold on the lower cover plate, set a rubber ring between the lower cover plate and the outer mold, apply lubricating oil between the outer mold and the inner mold and at the joint of the inner mold, and brush the release agent on the inner side of the inner mold;

[0019] Step 3, loading samples; after weighing the mass of the sample to be loaded, divide it into 3 parts according to the mass reduction of 10% each time, use a long-necked funnel to load the first part into the mold, use a hammer to compact it to the calculated theoretical height, then load the second and third samples, and after each sample is loaded, compact it to the calculated theoretical height, calibrate the height after each loading and the number of compactions; after loading, the surface of the sample is flush with the top surface of the inner mold;

[0020] Step 4, seal the sample in the mold; set a rubber ring between the upper cover plate and the outer mold, and use the tension bolt rod and the tension bolt to pull and press the upper cover plate and the lower cover plate together;

[0021] Step 5, start grouting; open the grout inlet valve and the grout outlet valve, set the grouting pressure, start grouting, and close the grout outlet valve after the slurry flowing out of the mold slurry outlet pipe is uniform;

[0022] Step 6, maintain the grouting pressure; after closing the grouting valve, when the grouting pressure reaches the designed pressure, start recording the time, maintain the grouting pressure for the designed pressure holding time, and then close the grouting valve;

[0023] Step 7: After grouting is completed, the pressure is released; after the pressure is maintained, the slurry outlet valve is opened, the upper cover plate of the outer mold is removed, and the pressure in the mold is released;

[0024] Step 8, remove the outer mold; after the grouting stone body is finally solidified, loosen the tension bolts, pull out the tension bolt rods, remove the upper and lower cover plates, place the mold bottom gasket that is consistent with the inner diameter of the outer mold under the inner mold, and then place it in the demoulding bracket, fix the outer mold with the mold clamp, open the switch valve, and then provide power through the power pump, adjust the pressure through the pressure controller through the pressure pipe, and drive the telescopic ejector rod to eject the inner mold and the sample from the outer mold;

[0025] Step 9, specimen curing: keep the specimen in the inner mold, cover with plastic wrap for curing, and remove the specimen inner mold after curing for a set time.

[0026] Furthermore, in step 3, a circular dense mesh is placed at the bottom of the mold before loading, and a circular dense mesh is placed on the upper surface of the sample after loading is completed.

[0027] Compared with the prior art, the significant progress of the present invention lies in: the high-pressure grouting demoulding test system and method provided by the present invention has a mold that can withstand sufficient grouting pressure and can be reused; in order to facilitate the removal of the stone body in the mold and obtain a complete stone body experimental specimen, it is also equipped with a demoulding device to overcome the shortcomings of the prior art such as "coring disturbance" and inconvenient mold operation; the present invention designs the high-pressure grouting mold, adds improvements in the traditional sense, and makes the method of obtaining the grouting stone body specimen simple, easy to operate, and more scientific and reasonable, which is mainly reflected in: 1) It can achieve no 1) The same size of stone bodies is produced to ensure the stability of the same batch of specimens; 2) The disturbance caused by drilling and coring to the specimen is eliminated. Each stone body specimen is formed separately, and there is no need to disturb the specimen by drilling and coring, which improves the accuracy of the test; 3) The specimen is not disturbed during curing. After grouting is completed, the specimen can be cured with the inner mold, which ensures the integrity of the specimen and is not affected by other factors; 4) The specimen is removed through a demoulding device, which uses a power drive system to control the pressure to slowly and stably remove the inner mold and the specimen from the outer mold, protecting the integrity of the specimen to the greatest extent.

[0028] In order to more clearly illustrate the functional characteristics and structural parameters of the present invention, further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 It is a schematic structural diagram of the demoulding device of the present invention;

[0031] Figure 2 Schematic diagram of the grouting mold structure of the present invention; (a) is a main view, and (b) is a top view;

[0032] Figure 3 is a top view of the demoulding device of the present invention;

[0033] Figure 4 is a side view of the demoulding device of the present invention;

[0034] Figure 5 It is a schematic diagram of the assembly of the upper and lower cover plates and the inner and outer molds of the grouting mold of the present invention;

[0035] Figure 6 It is a top view of the grouting mold after assembly of the present invention;

[0036] Figure 7 Schematic diagram of the inner and outer mold combination and the lower cover plate structure of the present invention; (a) is a top view of the inner and outer mold combination, and (b) is the lower cover plate;

[0037] Figure 8 Schematic diagram of the inner mold and outer mold structure of the present invention; wherein (a) is a cubic inner mold, (b) is a cylindrical inner mold, and (c) is an outer mold;

[0038] Description of reference numerals:

[0039] 1- demoulding bracket, 2-inner and outer mold combination, 3-telescopic ejector rod, 4-mold bottom gasket, 5-slurry outlet pipe, 6-slurry outlet valve, 7-upper cover, 8-tension bolt rod, 9-lower cover, 10-tension bolt, 11-outer mold, 12-inner mold, 13-outer mold handle, 14-rubber ring, 15-tension bolt hole, 16-joining seam, 17-slurry inlet valve, 18-slurry inlet pipe, 19-power pump, 20-switch valve, 21-pressure controller, 22-pressure pipe, 23-base, 24-mold splint. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-8 The present embodiment provides a high-pressure grouting demoulding test system and method, including a grouting mold and a demoulding device; the grouting mold includes a multi-size grouting mold, which can prepare grouting stone body specimens of different sizes according to different inner molds. The demoulding device includes a demoulding bracket, a mold bottom gasket and a power drive system, which can stably remove the inner mold and the specimen from the outer mold to protect the integrity of the specimen to the greatest extent.

[0042] The grouting mold comprises a cylindrical or cubic mold, which is designed by combining an inner mold 12 and an outer mold 11 and is connected to the output end of the grouting pump.

[0043] The mold includes an inner mold 12, an outer mold 11, an upper cover plate 7 locked on the upper part of the outer mold 11, and a lower cover plate 9 locked under the outer mold 11; the upper cover plate 7 and the lower cover plate 9 are each provided with 4 tension bolt holes 15, and tension bolts 10 are inserted into the tension bolt holes 15 to lock the upper cover plate 7 and the lower cover plate 9; grooves are respectively provided at the joints between the outer mold 11 and the upper cover plate 7 and the lower cover plate 9, and replaceable rubber rings 14 are prefabricated at the bottom of the grooves to enhance air tightness; the inner mold 12 includes multiple sections of splicing parts, which are spliced ​​in the outer mold 11 in sections through splicing seams 16; a slurry outlet valve 6 and a slurry outlet pipe 5 are provided above the upper cover plate 7 to control the outflow of slurry in the specimen mold; a slurry inlet valve 17 and a slurry inlet pipe 18 are provided below the lower cover plate 9 to control the stop of grouting into the specimen mold. An outer mold handle 13 is provided outside the outer mold 11.

[0044] The specimen mold includes two different specifications of specimen molds, one is a cylindrical specimen mold, which can obtain a cylindrical specimen after grouting, with a size of φ50×100mm; the other is a cubic specimen mold, which can obtain a cubic specimen after grouting, with a size of 100×100×100mm. Cylindrical specimen molds or cubic specimen molds can be mixed to prepare different numbers of specimens. At the same time, various suitable sizes can be produced according to needs to prepare specimens of different sizes.

[0045] The outer mold 11 and the inner mold 12 of the cylindrical specimen mold are both cylindrical; the inner mold 12 of the cylindrical specimen mold is cut into two semi-cylindrical shapes, and the inner mold 12 includes a splicing piece cut into two semi-cylindrical shapes. When in use, the splicing seam 16 is closely attached to the cavity of the outer mold 11 from the end, and the spliced ​​specimen cavity is cylindrical; when in use, the splicing seam 16 is closely attached to the cavity of the outer mold 11 from the end, forming an inner and outer mold assembly 2, and lubricating oil is applied to the inner side of the inner mold 12 and between the inner mold 12 and the outer mold 11 to facilitate the separation of the inner and outer molds 11 during the disassembly process. The outer mold 11 is cast from a stainless steel cylinder with a thickness of 15mm to ensure sufficient strength to withstand the grouting pressure. A groove with a width of 3mm is set at the junction with the two end covers, and a replaceable rubber ring 14 is prefabricated at the bottom of the groove to enhance air tightness. The tension bolt rods 8 are set on the two end covers so that the two end covers are tightly attached to the outer mold 11, and the sealing performance can be met after the sealing ring is pressed. The cover plates at both ends are 18 mm thick and are provided with 4 tension bolt holes 15. Grooves are provided at the joints with the two ends of the middle column of the outer mold 11 to ensure that the two are tightly connected. The cover plates, bolts, etc. are designed and calculated to achieve the strength to withstand the designed grouting pressure.

[0046] The outer mold 11 of the cubic mold is also designed to be cylindrical in shape, and the inner cavity is also a cylindrical cavity. The inner mold 12 is also divided into two halves for assembly. Except that the sample cavity is reserved as a cube, the rest of the design is the same as the cylindrical mold. The outer mold 11 and the inner mold 12 of the cubic mold are both cylindrical; the inner mold 12 includes two semi-cylindrical splicing parts, and when in use, the splicing seam 16 is tightly inserted into the cavity of the outer mold 11 from the end, and the spliced ​​sample cavity is a cube; lubricating oil is applied on the inner side of the inner mold 12 and between the inner mold 12 and the outer mold 11; the outer mold 11 is cast from a stainless steel cylinder with a thickness of 15mm, and grooves with a width of 3mm are respectively provided at the joints with the upper cover plate 7 and the lower cover plate 9, and replaceable rubber rings 14 are prefabricated at the bottom of the grooves to enhance air tightness; the thickness of the upper cover plate 7 and the lower cover plate 9 are both 18mm, and 4 tension bolt holes 15 are provided, and grooves are provided at the joints with the two ends of the middle column of the outer mold 11 for tight connection.

[0047] The demoulding device includes a demoulding bracket 1, a mold bottom gasket 4, a telescopic push rod 3, a power pump 19 and a pressure controller 21, and a base 23. Specifically, after grouting is completed, the tension bolts 10 are loosened, the tension bolt rods 8 are pulled out, the inner mold 12 and the outer mold 11 are separated from the upper and lower cover plates, and the mold bottom gasket 4 is placed under the inner mold, with the size just consistent with the inner diameter of the outer mold, and then it is placed as a whole in the demoulding bracket 1, and the mold outer mold is fixed with a mold clamp 24, and then the power pump 19 provides power, the pressure controller 21 adjusts the pressure, and drives the telescopic push rod 3 to slowly eject the inner mold 12 and the sample from the outer mold 11 to ensure the integrity of the sample to the greatest extent.

[0048] The mold and device of this implementation case can meet the standard cylindrical or cubic specimens of different experimental requirements, or required specimens of other sizes, thereby effectively reducing the molding error of the specimens. The specimens taken out by the demoulding device are of high quality and have little disturbance to the specimens. This device is easy to disassemble and operate, and is suitable for wide promotion and use.

[0049] Specifically, a high-pressure grouting demoulding test method includes the following steps:

[0050] Step S1, equipment cleaning and drying: before preparing the sample, the mold is cleaned to remove debris to avoid interference and blockage of the slurry, and the equipment is cleaned and dried to prevent moisture from affecting the water-cement ratio of the slurry;

[0051] Step S2, installing the outer mold 11 and the inner mold 12 of the test piece mold; installing the outer mold on the lower cover plate 9, setting a sealing O-ring between the lower cover plate 9 and the outer mold 11, brushing lubricating oil on the inner side of the outer mold 11 and the outer and inner sides of the inner mold 12 to facilitate the inner mold 12 to slide out of the outer mold 11 after grouting, and brushing a release agent on the inner side of the inner mold 12 to facilitate demoulding after the grouting stone body solidifies;

[0052] Step S3, loading samples; the volume of the specimen mold can be obtained from the mold specifications. According to the designed dry density, the mass of the sample that needs to be loaded into the specimen mold is calculated. After weighing the corresponding sample mass, it is divided into 3 parts by decreasing the mass by 10% each time. The first part is loaded into the mold using a long-necked funnel, and compacted to the calculated theoretical height with a hammer. Then the second and third samples are loaded. After each sample is loaded, it is also compacted to the calculated theoretical height. The height after each loading and the number of compactions are calibrated for the next loading operation. After loading, the surface of the sample is flush with the top surface of the inner mold 12, and the designed density is ensured. Before loading, a circular dense mesh is placed at the bottom of the mold. After loading, a circular dense mesh is placed on the upper surface of the sample to prevent sample particles from entering the grouting pipe, causing problems such as sample loss and grouting pipe blockage;

[0053] Step S4, sealing the sample in the mold; a rubber ring 14 is still provided between the upper cover plate 7 and the outer mold 11 to enhance air tightness, and the upper cover plate 7 and the bottom mold plate are pulled and pressed against each other by tension bolts to ensure that the outer mold and the rubber rings 14 of the two end covers are in close contact and no leakage occurs;

[0054] Step S5, start grouting; open the grout inlet valve 17 and the grout outlet valve 6 of the mold, set the grouting pressure required by the design, start grouting from the grout inlet pipe 18, and close the grout outlet valve after the slurry flowing out of the mold grout outlet pipe 5 is uniform;

[0055] Step S6, maintaining the grouting pressure; after closing the grouting valve 6, when the grouting pressure reaches the designed pressure, start recording the time, maintain the grouting pressure to the designed pressure holding time, and then close the grouting valve;

[0056] Step S7, grouting is completed and pressure is released; after pressure maintenance is completed, the slurry outlet valve 6 is opened, the outer mold upper cover plate 7 is removed, and the pressure in the mold is released;

[0057] Step S8, dismantle the outer mold 11; after the grouting stone body is finally solidified, loosen the tension bolts 10, pull out the tension bolt rods 8, separate the inner mold 12 and the outer mold 11 from the upper and lower cover plates, further place the mold bottom gasket 4 under the inner mold, the size is just the same as the inner diameter of the outer mold, and then place it as a whole in the demoulding bracket 1, ensure that the base 23 is in uniform contact with the ground, fix the mold outer mold with the mold clamping plate 24, open the switch valve 20, and then provide power through the power pump 19, adjust the pressure through the pressure pipe 22 through the pressure controller 21, and drive the telescopic ejector 3 to slowly eject the inner mold 12 and the sample from the outer mold 11;

[0058] Step S9, specimen curing: keeping the specimen in the inner mold 12, covering it with a plastic wrap for curing, and removing the specimen inner mold 12 after curing for a design period of time;

[0059] Step S10, carry out subsequent tests; after the test piece is polished and smoothed, carry out subsequent tests.

[0060] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high pressure grouting demoulding test system, characterized in that: The invention comprises a grouting mold and a demoulding device; the grouting mold comprises an integrally formed outer mold (11) and an inner mold (12) spliced ​​and arranged inside the outer mold, the outer shape of the inner mold (12) matches the outer mold (11), the inner shape of the inner mold (12) is determined according to the test piece to be prepared, and the stone body to be grouted is assembled in the inner mold (12), sealed and then grouting is performed; The demoulding device comprises a telescopic ejector rod (3) and a mold clamping plate (24). The inner and outer mold assembly (2) after grouting is placed in the demoulding device. The mold clamping plate (24) clamps the outer mold. The telescopic ejector rod is controlled to realize demoulding of the inner mold after grouting. The spliced ​​inner mold is removed to realize demoulding.

2. A high pressure grouting demoulding test system according to claim 1, characterized in that: The grouting mold also includes an upper cover plate (7), a lower cover plate (9), a tension bolt rod (8) and a tension bolt (10); The upper cover plate (7) is provided with a slurry outlet valve (6) and a slurry outlet pipe (5), and the lower cover plate (9) is provided with a slurry inlet valve (17) and a slurry inlet pipe (18); the upper cover plate (7) and the lower cover plate (9) are respectively sealed and connected to the upper and lower ends of the outer mold (11); the upper cover plate (7) and the lower cover plate (9) are evenly distributed with tension bolt holes (15) on the outer circumference; the tension bolt rods (8) pass through the tension bolt holes of the upper and lower cover plates and are fastened by tension bolts (10).

3. A high pressure grouting demoulding test system according to claim 2, characterized in that: The outer mold (11) is a stainless steel cylindrical casting with a thickness of 15±3 mm. A groove with a width of 3±0.5 mm is provided at the junction of the upper cover plate and the lower cover plate. An annular protrusion matching the groove is provided on the outer mold (11). A replaceable rubber ring (14) is prefabricated at the bottom of the groove. The thickness of the upper cover plate and the lower cover plate is 18±3 mm.

4. A high pressure grouting demoulding test system according to claim 3, characterized in that: The inner mold (12) comprises two semi-cylinders, and the joint seam (16) between the two semi-cylinders is tooth-shaped.

5. A high pressure grouting demoulding test system according to claim 4, characterized in that: The cavity of the inner mold (12) after the two semi-cylinders are spliced ​​together is cylindrical or cubic.

6. A high pressure grouting demoulding test system according to claim 1, characterized in that: The outer mold (11) is provided with an outer mold handle (13).

7. A high pressure grouting demoulding test system according to claim 1, characterized in that: The demoulding device also includes a power pump (19), a pressure controller (21), a switch valve (20), a pressure pipe (22), a mold bottom gasket (4), a demoulding bracket (1) and a base (23); The inner and outer mold assembly (2) is placed on a demoulding support (1), a mold bottom gasket (4) is provided below the inner and outer mold assembly (2), and the size of the mold bottom gasket (4) matches the size of the inner mold; two mold clamps (24) are arranged opposite to each other, and the two mold clamps (24) are arranged outside the inner and outer mold assembly (2) and clamp the outer mold (11); The pressure delivery pipe (22) is connected to the telescopic ejector rod (3), and the power pump (19) controls the telescopic ejector rod (3) to act on the test piece through the pressure controller (21), and cooperates with the mold clamping plate (24) to realize demoulding; the switch valve (20) is located on both sides of the pressure controller (21); the base (23) is located at the bottom and is used to fix the telescopic ejector rod (3) and the demoulding bracket (1).

8. A high-pressure grouting demoulding test method, the method is based on a high-pressure grouting demoulding test system according to any one of claims 1 to 7, characterized in that: The steps include: Step 1: Clean and dry the equipment; Step 2, installing the outer mold (11) and the inner mold (12) of the test piece mold; installing the outer mold (11) on the lower cover plate (9), arranging a rubber ring (14) between the lower cover plate (9) and the outer mold (11), applying lubricating oil between the outer mold (11) and the inner mold (12) and at the joint of the inner mold (12), and brushing a release agent on the inner side of the inner mold (12); Step 3, loading the sample; after weighing the mass of the sample to be loaded, divide it into three portions according to a mass reduction of 10% each time, use a long-necked funnel to load the first portion into the mold, use a hammer to compact it to the calculated theoretical height, then load the second and third portions of the sample, and after each sample is loaded, compact it to the calculated theoretical height, and calibrate the height after each loading and the number of compactions; after loading, the surface of the sample is flush with the top surface of the inner mold (12); Step 4, sealing the sample in the mold; setting a rubber ring (14) between the upper cover plate (7) and the outer mold (11), and using the tension bolt rod and the tension bolt to pull and press the upper cover plate (7) and the lower cover plate together; Step 5, start grouting; open the grout inlet valve and the grout outlet valve, set the grouting pressure, start grouting, and close the grout outlet valve after the slurry flowing out of the mold slurry outlet pipe is uniform; Step 6, maintain the grouting pressure; after closing the grouting valve, when the grouting pressure reaches the designed pressure, start recording the time, maintain the grouting pressure for the designed pressure holding time, and then close the grouting valve; Step 7, after grouting is completed, the pressure is released; after the pressure is maintained, the slurry outlet valve is opened, the outer mold upper cover plate (7) is removed, and the pressure in the mold is released; Step 8, removing the outer mold (11); after the grouting stone body is finally solidified, loosen the tension bolts (10), pull out the tension bolt rods (8), remove the upper and lower cover plates, place the mold bottom gasket (4) with the same inner diameter as the outer mold under the inner mold, and then place it in the demoulding bracket (1), fix the outer mold (11) with the mold clamp (24), open the switch valve (20), and then provide power through the power pump (19), adjust the pressure through the pressure pipe (22) through the pressure controller (21), and drive the telescopic ejector (3) to eject the inner mold and the sample from the outer mold (11); Step 9, curing the specimen: keeping the specimen in the inner mold (12), covering it with a plastic wrap for curing, and removing the specimen inner mold (12) after curing for a set time.

9. A high pressure grouting demoulding test method according to claim 8, characterized in that: Step 3: Place a circular dense mesh at the bottom of the mold before loading. After loading, place the circular dense mesh on the upper surface of the sample.

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