A cementitious grout material forming apparatus and method

Abstract

The application discloses a cement grouting material forming device and method, which comprises a cylinder and a cushion block, first and second end covers are respectively and tightly arranged at two ends of the cylinder, a plurality of capillary layers are arranged on the inner wall of the cylinder, and a replaceable water permeable membrane is arranged on the inner wall of the cylinder along the circumferential direction; a slurry inlet is arranged on the first end cover, and a water excretion hole is arranged on the second end cover; the cushion block is arranged in the cylinder, a plurality of capillary drainage grooves are arranged on the side of the second end cover close to the cushion block, and the capillary layer and the capillary drainage groove are matched to drain the water excreted by the test piece in the cylinder from the water excretion hole. The capillary layer is arranged to simulate the capillary pores of the surrounding soil in the engineering application process, the excreted water can be guided out of the capillary layer when the cement grouting material is pressurized, the water-binder ratio of the test piece measured is closer to the actual water-binder ratio, and the compression resistance data is more in line with the actual situation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cement grouting, in particular to a cement grouting material forming device and method. BACKGROUND

[0002] Cement grouting is widely used in tunnel grouting, soil reinforcement and other fields as a reinforcing material. The main purpose of tunnel grouting reinforcement construction is to improve the loose nature of the stratum and control water, so as to increase the compressive strength and adhesion of the tunnel top and side, achieve the purpose of reinforcement, and ensure the stability of the surrounding rock after lining and the safety of the tunnel. Pile foundation post grouting technology is a pile foundation construction technology that pressurizes cement grouting into the pile bottom and pile side soil to improve the bearing capacity of the pile foundation and reduce settlement, effectively solving the problems of mud skin sediment, disturbance of pile bottom bearing layer, and relaxation of pile side soil stress during bridge bored pile construction, and improving the bearing capacity of the pile foundation and the safety of the structure.

[0003] The strength of cement grouting is generally based on the test piece with standard curing for 28 days. The flow degree of cement grouting material is required during construction. After the grout is injected into the engineering entity, the surrounding soil will have a water absorption process, and a pressure of (0.2-1.2) MPa will be applied during grouting, which will increase the water excretion under this pressure. When verifying the strength of cement grouting material in the laboratory, the cement grouting material will have water excretion during mixing and forming. The ordinary test mold cannot absorb water after forming, so there is a large difference between the measured compressive strength and the actual strength. It is difficult to accurately verify the strength of the construction site through indoor proportioning design or verification to control the amount of glue material, and then control the construction quality and cost.

[0004] Therefore, how to make the compressive strength of the test piece after forming closer to the strength of the construction site is one of the problems to be solved at present. SUMMARY

[0005] The purpose of the present application is to provide a cement grouting material forming device and method to solve the problems in the prior art. It can make the test piece form in an environment close to the construction site, so that the strength of the test piece after forming is closer to the strength of the construction site.

[0006] The present application provides a cement grouting material forming device, which comprises a barrel and a pad, the two ends of the barrel are respectively sealed and installed with a first end cover and a second end cover, a plurality of capillary layers are opened on the inner wall of the barrel, and a replaceable water permeable membrane is arranged on the inner wall of the barrel along the circumferential direction; a slurry inlet is arranged on the first end cover, and a water excretion hole is opened on the second end cover; the pad is located in the barrel, a plurality of capillary drainage grooves are opened on one side of the second end cover close to the pad, and the capillary layer and the capillary drainage groove cooperate to discharge the water excreted by the test piece in the barrel from the water excretion hole.

[0007] Further, the barrel body comprises an outer barrel and a flexible inner barrel; a cavity is arranged between the outer barrel and the flexible inner barrel, a liquid inlet is arranged on the outer barrel and communicates with the cavity, one end of the cavity close to the first end cover is provided with an exhaust port, and a first valve body is arranged on the exhaust port; and the capillary layer is arranged on the inner wall of the flexible inner barrel.

[0008] Further, the first end cover and the second end cover are both threadedly connected with the barrel body, and anti-skid lines are arranged on the outer periphery of the first end cover and the second end cover.

[0009] Further, the weeping hole is connected with a drain pipe, and a second valve body is arranged on the drain pipe.

[0010] Further, the inner walls of the two ends of the outer barrel are respectively fixedly provided with limiting rings, the two ends of the flexible inner barrel are respectively fixedly connected with the inner walls of the two limiting rings, and the cavity is formed between the inner wall of the outer barrel, the outer wall of the flexible inner barrel and the two limiting rings.

[0011] Further, the first end cover is internally provided with a protruding block, the protruding block is coaxially arranged with the first end cover, and the protruding block and the corresponding limiting ring are in sliding sealing cooperation.

[0012] Further, the slurry inlet penetrates through the protruding block.

[0013] Further, the first end cover is further provided with a pressure gauge.

[0014] A cement grouting material forming method comprises the following steps:

[0015] S1, the first valve body of the forming device is opened, liquid is injected into the cavity through the liquid inlet until the cavity is filled, and then the first valve body is closed;

[0016] S2, the slurry is poured into the flexible inner barrel through the slurry inlet, and the liquid in the cavity is pressurized at the same time so that the pressure is the same as the grouting pressure;

[0017] S3, after the grouting is completed, the pressure is maintained and the specimen is hardened;

[0018] S4, after the specimen is hardened, the liquid in the cavity is discharged, then the first end cover and the second end cover are opened, and the cushion block and the specimen are taken out to complete demolding.

[0019] Further, the grouting pressure in S2 is between 0.2-1.2 MPa.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] 1. The present application can simulate the capillary pores of the surrounding soil in the process of engineering application by setting the capillary layer, and when the cement grouting material is pressurized, the bleeding water can be guided out of the capillary layer, so that the water-cement ratio of the measured test piece is closer to the actual water-cement ratio, and the compression data is more in line with the actual situation.

[0022] 2. The present application can make the test piece more flat during shaping, and the experimental data has small dispersion and good repeatability.

[0023] 3. The present application can continuously grout under pressure, compensate the settlement of cement grouting at the same time of bleeding water removal, facilitate the control of the standard size of the test piece, and make the test data more accurate.

[0024] 4. The present application sets a cavity between the outer cylinder and the flexible inner cylinder, and when used, the pressure of the grouting material can be balanced by injecting liquid in the cavity, and when demolding is needed, the liquid in the inner cavity is discharged, so that the sample is easily taken out of the mold, saving time and effort. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic view of a cement grouting material forming device of the present application;

[0026] Figure 2 is a front view of Figure 1 ;

[0027] Figure 3 is a sectional view along the direction of A-A of

[0028] Figure 4 is an enlarged view of A in Figure 3

[0029] Figure 5 is a structural schematic view of a cylinder body;

[0030] Figure 6 is a structural schematic view of a first end cover;

[0031] Figure 7 is a structural schematic view of a second end cover.

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] 1-cylinder body, 2-pad, 3-first end cover, 4-second end cover, 5-capillary layer, 301-grouting inlet, 401-bleeding hole, 402-capillary drainage groove, 101-outer cylinder, 102-flexible inner cylinder, 6-cavity, 7-exhaust port, 8-first valve body, 9-anti-slip pattern, 10-drainage pipe, 11-second valve body, 12-limiting ring, 302-bump, 13-pressure gauge, 14-grouting pipe, 15-third valve body, 16-liquid inlet pipe, 17-fourth valve body. DETAILED DESCRIPTION ​

[0034] The following embodiments described by referring to the drawings are exemplary, only for explaining the present application, and cannot be explained as the limitation of the present application.

[0035] Embodiment 1

[0036] Referring to Figures 1-6 As shown in the drawings, the present embodiment proposes a cement grouting material forming device, which comprises a barrel 1 and a cushion 2. In the specific implementation, the barrel 1 is selected as a cylindrical steel barrel.

[0037] The first end cover 3 and the second end cover 4 are respectively sealingly installed at both ends of the barrel 1, and the first end cover 3 and the second end cover 4 are threadedly connected with the barrel 1, that is, the first end cover 3 and the second end cover 4 are detachably connected with the barrel 1. The outer periphery of the first end cover 3 and the second end cover 4 is provided with an anti-skid pattern 9, and the first end cover 3 and the second end cover 4 are threadedly connected with the barrel 1, which is convenient for installation and disassembly.

[0038] A plurality of capillary layers 5 are arranged on the inner wall of the barrel 1, and in the specific implementation, the capillary layers 5 are uniformly arranged on the inner wall of the barrel 1, and the length direction of the capillary layers 5 is the same as the length direction of the barrel 1. In the use state, the center line of the barrel 1 is vertically placed, that is, in the use state, the length direction of the capillary layers 5 is consistent with the vertical direction.

[0039] The capillary layer 5 can be composed of a capillary water guide pipe, and the diameter of the capillary water guide pipe can be selected to be generally between 0.18-1.2MM in the inner diameter and about 0.8-1.8MM in the outer diameter. The capillary layer 5 can absorb and guide out the water excreted during the forming process of the test piece, which is conducive to better simulating the capillary pores of the surrounding soil in the engineering application process, so as to make the measured water binder ratio of the test piece closer to the actual water binder ratio, and make the compressive strength of the test piece closer to the actual compressive strength. The inner wall of the barrel 1 is arranged with a replaceable water-permeable membrane (not shown in the figure) along the circumferential direction. The arrangement of the water-permeable membrane can make the test piece forming more flat, and at the same time prevent the blocking of the capillary layer 5 by the slurry. The water-permeable membrane is a prior art, and the existing water-permeable membrane can be arranged along the inner wall of the barrel 1. In use, the water-permeable membrane is arranged on the side wall and the bottom of the barrel 1; the first end cover 3 is provided with a slurry inlet 301, the slurry inlet 301 is connected with a slurry inlet pipe 14, the slurry inlet pipe 14 is provided with a third valve body 15, and the second end cover 4 is provided with a water excretion hole 401; the cushion 2 is located in the barrel 1, and a plurality of capillary drainage grooves 402 are arranged on the side of the second end cover 4 close to the cushion 2, the groove width of the capillary drainage grooves 402 is between 0.8-1.2MM, and the capillary layer 5 and the capillary drainage grooves 402 can cooperate to guide out the water excreted by the test piece in the barrel 1 from the water excretion hole 401. The arrangement of the cushion 2 can block the water excretion hole 401 to avoid the blocking of the water excretion hole 401 by the slurry, and facilitate the demolding of the test piece after forming. In the specific implementation, in order to ensure the flatness of the bottom of the test piece, the water excretion hole 401 can be provided as a plurality of holes, and the diameter thereof is set to be between 0.2 to 1 millimeter.

[0040] To facilitate demolding of the specimen, the cylinder 1 can be configured to include an outer cylinder 101 and a flexible inner cylinder 102. A cavity 6 is disposed between the outer cylinder 101 and the flexible inner cylinder 102. The outer cylinder 101 is provided with a liquid inlet connected to the cavity 6. An exhaust port 7 is provided at the end of the cavity 6 near the first end cap 3. Exhaust port 7 is equipped with a first valve body 8. Exhaust port 7 allows air within the cavity 6 to be expelled when liquid is poured into the cavity 6 through the liquid inlet. Specifically, exhaust port 7 is located at the position of the cavity 6 closest to the first end cap 3. This ensures that the liquid completely fills the cavity 6, preventing the air from being compressed during grouting and causing uneven deformation of the flexible inner cylinder 102. In other words, filling the cavity 6 with water effectively maintains the shape of the flexible inner cylinder 102 because water is not easily compressed. A capillary layer 5 is provided on the inner wall of the flexible inner cylinder 102. In specific implementation, a liquid inlet pipe 16 can also be provided on the liquid inlet, and a fourth valve body 17 can be provided on the liquid inlet pipe 16. Figures 2-3 As shown. When in use, tighten the second end cap 4 onto the cylinder 1, open the first valve body 8, connect the liquid inlet pipe 16 to the liquid supply box, and pump the liquid in the liquid supply box into the cavity 6 through the pressure pump until the cavity 6 is filled with liquid. Then, close the first valve body 8, then place a water-permeable membrane in the inner cylinder, and then place the pad 2 so that the pad 2 is pressed tightly on the second end cap 4. In order to press the pad 2 tightly on the second end cap 4, the molding device needs to be placed vertically, that is, the second end cap 4 is located at the bottom, and then tighten the first end cap 3, connect the slurry inlet pipe 14 to the slurry supply device, open the third valve body 15, and inject slurry into the cylinder through the slurry inlet pipe 14. While injecting the slurry, adjust the pressure of the liquid injected into the cavity 6 according to the pressure of the injected slurry to ensure that the pressure inside and outside the flexible inner cylinder 102 is the same. After the grouting is completed, close the third valve body 15, close the fourth valve body 17, and the specimen can be demolded after hardening. The liquid injected into the cavity 6 here can be water.

[0041] During demolding, the fourth valve body 17 is opened to drain the water from the cavity 6, and then the first and second end caps 3 and 4 are unscrewed. The spacer 2 and the test piece are then removed. Since the flexible inner cylinder 102 maintains a cylindrical shape during molding, the stress between the flexible inner cylinder 102 and the test piece is relatively small after the water is drained (the flexible inner cylinder 102 does not deform outward), making demolding relatively easy.

[0042] To facilitate control of the water seepage rate, in practice, the seepage hole 401 can be connected to a drain pipe 10 equipped with a second valve body 11. To facilitate connection between the flexible inner tube 102 and the outer tube, stop rings 12 can be fixedly mounted on the inner walls of each end of the outer tube 101. The ends of the flexible inner tube 102 are fixedly connected to the inner walls of the two stop rings 12, forming a cavity 6 between the inner wall of the outer tube 101, the outer wall of the flexible inner tube 102, and the two stop rings 12.

[0043] The first end cover 3 is provided with a protrusion 302 coaxially arranged with the first end cover 3, the protrusion 302 is in sliding sealing cooperation with the corresponding limiting ring 12, and the slurry inlet 301 penetrates through the protrusion 302. By arranging the protrusion 302, the connection firmness of the first end cover 3 and the cylinder body 1 can be improved, and the sealing effect can be improved. In specific implementation, the sealing can also be realized by arranging a sealing ring.

[0044] In order to facilitate observation of the grouting pressure, the first end cover 3 is further provided with a pressure gauge 13, and the pressure gauge 13 can facilitate observation of the grouting pressure. In specific implementation, a pressure gauge in communication with the cavity 6 can also be arranged to facilitate observation of the pressure in the cavity 6.

[0045] In specific implementation, the capillary layer 5 can also be formed by arranging capillary water guide grooves on the inner wall of the flexible inner cylinder 102. Specifically, the opening of the capillary water guide groove can be arranged as 0.8-1.2MM.

[0046] In specific implementation, in order to avoid that the flexible inner cylinder 102 has a certain flexibility and cannot maintain a cylindrical shape when bearing water pressure, the flexible inner cylinder 102 is a cylindrical barrel with a thickness of 3-8mm, and the material thereof is polytetrafluoroethylene.

[0047] Embodiment 2

[0048] This embodiment is a method for molding by using the cement grouting material molding device in embodiment 1, and the same parts will not be repeated, and only the different parts will be described below.

[0049] The application further discloses a cement grouting material molding method, which comprises the following steps.

[0050] S1, a water permeable film is laid on the inner wall and bottom of the flexible inner cylinder 102, the first valve body 8 of the molding device is opened, liquid is injected into the cavity 6 through the liquid inlet, until the cavity 6 is filled, and then the first valve body 8 is closed; in use, the cylinder body 1 is vertically arranged, the first end cover 3 faces upward, and the second end cover 4 faces downward. First, the cavity 6 is filled with water, and the main purpose is to prevent deformation of the flexible inner cylinder 102 caused by grouting in the subsequent process by using the characteristics that liquid is difficult to be compressed.

[0051] S2, the first end cover 3 is screwed, the slurry is poured into the flexible inner cylinder 102 through the slurry inlet 301, and the liquid in the cavity 6 is pressurized to have the same pressure as the grouting pressure; in this way, the pressure on the inner and outer sides of the flexible inner cylinder 102 can be kept equal during grouting, and deformation can be avoided. In specific implementation, the grouting pressure in this step is 0.2-1.2MPa.

[0052] S3. After grouting is completed, the pressure is maintained and the specimen is allowed to stand until it hardens;

[0053] S4. After the specimen has hardened, the liquid in cavity 6 is drained. Then, the first and second end caps 3 and 4 are opened, and the spacer 2 and specimen are removed to complete demolding. Because flexible inner cylinder 102 is flexible and the water in cavity 6 has been drained, the specimen is formed, and the pressure between flexible inner cylinder 102 and the specimen is reduced. Furthermore, a water-permeable membrane is provided between the two, eliminating any adhesion between them. Therefore, flexible inner cylinder 102 can be demolded smoothly.

[0054] Example 3

[0055] This embodiment uses the cement grouting material forming device in Example 1 to achieve a forming method, and the similarities will not be repeated. Only the differences will be described below.

[0056] This embodiment is basically the same as embodiment 2, except that:

[0057] In step S1, when water is poured into the cavity 6, after it is filled with water, the first valve body 8 is closed and the water pressure in the cavity 6 is increased to 0.15-0.3 MPa, specifically to ensure that the flexible inner tube 102 maintains a substantially cylindrical shape. Specifically, it can be 0.2 MPa, 0.25 MPa, etc. The valve body on the pipe connected to the liquid inlet is then closed, that is, the cavity 6 is kept sealed, and no water can enter or flow out.

[0058] Furthermore, during the grouting process, the water pressure within the cavity 6 is no longer actively increased. Instead, the pressure generated during the grouting process is transferred to the cavity 6 via the flexible inner tube 102. At this time, since water is difficult to compress under the entire working environment, although the flexible inner tube 102 does not undergo significant deformation, its pressure is substantially equal to the grouting pressure. Compared to Example 2, the working process of this embodiment is easier to control.

[0059] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above are only preferred embodiments of the present invention, but the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. A cementitious grout material forming apparatus, characterized by: The application relates to a slurry curing device, which comprises a cylinder (1) and a cushion block (2), the two ends of the cylinder (1) are respectively sealedly provided with a first end cover (3) and a second end cover (4), a plurality of capillary layers (5) are arranged on the inner wall of the cylinder (1), the capillary layers (5) are uniformly arranged on the inner wall of the cylinder (1), the length direction of the capillary layers (5) is the same as the length direction of the cylinder (1), the capillary layers (5) are composed of capillary water guide pipes, the inner diameter of the capillary water guide pipes is between 0.18-1.2 MM, the outer diameter is between 0.8-1.8 MM, replaceable water permeable membranes are arranged on the inner wall of the cylinder (1) along the circumferential direction, a slurry inlet (301) is arranged on the first end cover (3), a water emission hole (401) is arranged on the second end cover (4), the cushion block (2) is arranged in the cylinder (1), a plurality of capillary drainage grooves (402) are arranged on the side of the second end cover (4) close to the cushion block (2), the capillary layers (5) and the capillary drainage grooves (402) can cooperate to drain the water emitted by a test piece in the cylinder (1) from the water emission hole (401). The cylinder (1) comprises an outer cylinder (101) and a flexible inner cylinder (102), a cavity (6) is arranged between the outer cylinder (101) and the flexible inner cylinder (102), a liquid inlet is arranged on the outer cylinder (101) and communicates with the cavity (6), an exhaust port (7) is arranged at one end of the cavity (6) close to the first end cover (3), a first valve body (8) is arranged on the exhaust port (7), and the capillary layers (5) are arranged on the inner wall of the flexible inner cylinder (102).

2. The cement grout material molding apparatus according to claim 1, characterized by: The first end cover (3) and the second end cover (4) are both threadedly connected with the cylinder (1), and anti-skid lines (9) are arranged on the outer circumferences of the first end cover (3) and the second end cover (4).

3. The cement grout material molding apparatus according to claim 1, characterized by: The water emission hole (401) is connected with a drainage pipe (10), and a second valve body (11) is arranged on the drainage pipe (10).

4. The cementitious grout material forming device of claim 1, wherein: Limiting rings (12) are fixedly arranged on the inner walls of the two ends of the outer cylinder (101), the two ends of the flexible inner cylinder (102) are fixedly connected with the inner walls of the two limiting rings (12), and the cavity (6) is formed between the inner wall of the outer cylinder (101), the outer wall of the flexible inner cylinder (102) and the two limiting rings (12).

5. The apparatus of claim 4, wherein: A protruding block (302) is arranged in the first end cover (3), the protruding block (302) is coaxially arranged with the first end cover (3), and the protruding block (302) is in sliding sealing cooperation with the corresponding limiting ring (12).

6. The cementitious grout material forming apparatus of claim 5, wherein: The slurry inlet (301) penetrates through the protruding block (302).

7. The apparatus of any one of claims 1-6, wherein: A pressure gauge (13) is further arranged on the first end cover (3).

8. A method of forming a cementitious grout material, characterized by: The application further discloses a slurry curing method, which comprises the following steps. S1, the first valve body (8) of the forming device is opened, liquid is injected into the cavity (6) through the liquid inlet, the cavity (6) is filled, then the first valve body (8) is closed, S2, slurry is poured into the flexible inner cylinder (102) through the slurry inlet (301), and the liquid in the cavity (6) is pressurized to be the same as the grouting pressure, ​ S3, after the grouting is completed, the pressure is kept and the specimen is hardened; S4, after the specimen is hardened, the liquid in the cavity (6) is discharged, then the first end cover (3) and the second end cover (4) are opened, the cushion block (2) and the specimen are taken out, and the demolding is completed.

9. The method of claim 8, wherein: The grouting pressure in S2 is between 0.2-1.2MPa.

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