CN217111719U

CN217111719U - Grouting calculus body sampling device

Info

Publication number: CN217111719U
Application number: CN202220970927.8U
Authority: CN
Inventors: 曹磊; 张聪; 谢梦珊; 梁经纬; 郭晓静; 蒋买勇; 刘京铄; 李金友; 顾春慧; 杨晓雅
Original assignee: Hunan Polytechnic Of Water Resources And Electric Power; Central South University of Forestry and Technology
Current assignee: Hunan Polytechnic Of Water Resources And Electric Power; Central South University of Forestry and Technology
Priority date: 2022-04-25
Filing date: 2022-04-25
Publication date: 2022-08-02
Anticipated expiration: 2032-04-25

Abstract

The utility model provides a grouting stone body sample preparation device, which comprises a sample preparation mould and a constant pressure grouting component which are connected through a grouting hose, so as to inject stone body slurry into the sample preparation mould at constant pressure, the sample preparation mould comprises an outer sleeve, a first inner sleeve, a second inner sleeve, a top cover and a base, the top cover and the base are respectively arranged at two ends of the outer sleeve in a sealing way, the top cover is provided with a joint connected with the grouting hose, the base is provided with a drain hole, the first inner sleeve and the second inner sleeve are arranged inside the outer sleeve and are spliced at the bottom and the top, a grouting knot entity in the first inner sleeve after grouting is a prepared standard sample, grouting firm test blocks formed under different grouting parameter conditions can be prepared, the physical and mechanical properties of the test blocks are tested, the relationship between the strength, permeability coefficient and other performance indexes of the grouting stone body and the slurry water cement ratio, the grouting pressure and the grouting amount is established, and the grouting effect is evaluated, and scientific and reasonable parameters are provided for grouting reinforcement of the karst area.

Description

Grouting calculus body sampling device

Technical Field

The utility model relates to a slip casting analogue test field, in particular to slip casting calculus system appearance device.

Background

In the engineering construction process, karst caves in various forms are frequently encountered, and if effective measures are not taken for treatment and prevention, cave collapse is easily induced to further cause ground settlement and cause engineering accidents. The most common karst pretreatment measure at the present stage is grouting reinforcement, and the method has the advantages of simple operation, strong applicability, obvious effect and the like. However, grouting reinforcement operation belongs to concealed engineering, and grouting materials and grouting parameters are mostly selected according to construction experience, so that grouting reinforcement effect has larger uncertainty.

In order to research the grouting reinforcement effect, many researchers prepare grouting stone samples through laboratories and research the performance and the influence factors of grouting stones, but most sample preparation methods uniformly mix grouting slurry and soil, pour the mixture into a mold for curing and forming, and then perform performance testing. The sample preparation method does not consider the influence of grouting parameters such as grouting pressure, grouting amount and the like on the performance of a grouting concretion body, and the simulation of the grouting reinforcement process in a karst region cannot be accurately realized.

Therefore, how to make grouting stone body samples formed under different grouting parameter conditions needs to be solved urgently, and a sample preparation device and a sample preparation method of a grouting concretion solid test block with controllable grouting pressure and grouting amount are urgently needed, so that the relationship between the performance of the grouting stone body and grouting parameters such as a slurry water-cement ratio, grouting pressure, grouting amount and the like is established, and more scientific and reasonable grouting parameters are provided for field grouting construction.

It should be noted that the above background description is only for the convenience of clear and complete description of the technical solutions of the present application and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present application.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: aiming at the defects in the background technology, the sample preparation scheme of the grouting stone body sample is provided, the simulation of the grouting process in a karst area can be realized, the grouting stone body samples formed under the conditions of different grouting pressures and grouting amounts are obtained, and guidance is provided for selecting reasonable grouting parameters.

In order to achieve the purpose, the utility model provides a slip casting calculus system appearance device, including system appearance mould and constant voltage slip casting subassembly, constant voltage slip casting subassembly with through defeated thick liquid hose connection between the system appearance mould, with to in the system appearance mould constant voltage injection knot stone body thick liquid, system appearance mould includes outer sleeve, first inner skleeve, second inner skleeve, top cap and base, the top cap the base is seal installation respectively in the both ends of outer sleeve, seted up on the top cap with defeated thick liquid hose connection's joint, the wash port has been seted up on the base, first inner skleeve, the second inner skleeve is laid the outer sleeve is inside and lower, last concatenation, the slip casting back slip casting knot entity in the first inner skleeve is the standard sample of making.

Further, the constant-pressure grouting assembly is installed on a test steel frame platform, and a plurality of universal wheels are arranged at the bottom of the test steel frame platform, so that the constant-pressure grouting assembly can adjust the distance between the constant-pressure grouting assembly and the sample preparation mold.

The constant-pressure grouting assembly comprises a grouting barrel, a grouting pressure control console, an electric pump hydraulic machine, a hydraulic oil cylinder, an oil tank and a grouting barrel, an oil port of the hydraulic oil cylinder is connected with the electric pump hydraulic machine, the electric pump hydraulic machine is connected with the oil tank through hydraulic oil pipes, a piston is arranged in the grouting barrel and is associated with the piston of the hydraulic oil cylinder to synchronously extend and retract, the grouting pressure control console is used for adjusting the rotating speed of the electric pump hydraulic machine and controlling the electric pump hydraulic machine to work at constant frequency and pressure, a first valve, a second valve and a third valve are arranged at an output port of the grouting barrel, the first valve is connected with the grouting barrel, the second valve is connected with a pressure release hose, and the third valve is connected with a slurry delivery hose.

Furthermore, a pressure monitoring meter and a digital flowmeter are arranged on the slurry conveying hose, and the pressure monitoring meter and the digital flowmeter are connected with an intelligent display screen through signal lines so as to realize the real-time acquisition and display of the grouting pressure and the grouting amount information.

Further, the outer sleeve is formed by two semi-cylindrical longitudinal hasps, the outer wall of the outer sleeve is provided with a clamp, and the second inner sleeve and the first inner sleeve are in clearance fit with the outer sleeve.

Furthermore, openings are formed in the diagonal positions of the top cover, the diagonal positions of the base are hinged to a threaded rod respectively, the top end of the threaded rod is inserted into the openings of the top cover and is locked by nuts, and the top cover and the base are fixed.

Furthermore, a detachable permeable stone is padded on the base to provide a seepage channel for free water in the grouting process, geotechnical filter paper is paved on the permeable stone to prevent loss of cement particles, a circular clamping piece is arranged below the permeable stone to prevent cracking of the permeable stone due to overlarge grouting pressure, and a through groove for draining water is formed in the bottom of the circular clamping piece.

Further, before grouting, a layer of engine oil is brushed on the inner wall of the first inner sleeve to reduce adhesion between a grouting solid sample and the inner wall of the sleeve during demolding.

The above technical scheme of the utility model has following beneficial effect:

the utility model provides a slip casting calculus system appearance device can be used to the indoor simulation test of karst district slip casting, can obtain the slip casting solid test block that forms under the different slip casting parameter conditions through the device, test the physical and mechanical properties of test block, establish the relation between performance index such as intensity, osmotic coefficient of the slip casting concretion body and thick liquid water cement ratio, grouting pressure, grouting volume to evaluate the slip casting effect, provide scientific and reasonable parameter for karst district slip casting reinforcement;

the utility model controls the rotating speed of the hydraulic motor of the electric pump by adjusting the frequency of the input current through the constant pressure grouting component with controllable grouting pressure and grouting amount, and pushes the piston rod of the grouting cylinder with constant force, thereby realizing the constant pressure output of the grout;

the utility model can accurately prepare grouting stone samples with standard sizes, and prevent different test blocks from causing large performance difference due to size difference and influencing test effect; the size of the standard test block is consistent with that of a geotechnical triaxial sample, so that tests such as triaxial penetration, triaxial compression and the like are convenient to perform;

the sample preparation device of the utility model is very convenient to install, operate, disassemble and clean, and improves the sample preparation quality and efficiency of the grouting stone sample;

other advantageous effects of the present invention will be described in detail in the following detailed description.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the connection between the hydraulic cylinder and the grouting cylinder of the present invention;

fig. 3 is the schematic diagram of the sample preparation mold of the present invention.

[ description of reference ]

100-preparing a sample mold; 101-an outer sleeve; 102-a first inner sleeve; 103-a second inner sleeve; 104-a top cover; 105-a base; 106-threaded rod; 107-permeable stone; 108-circular cards; 200-constant pressure grouting component; 201-grouting cylinder; 202-grouting pressure console; 203-electric pump hydraulic machine; 204-a hydraulic oil cylinder; 205-oil tank; 206-a pulp inlet cylinder; 207-intelligent display screen; 208-a first valve; 209-a second valve; 210-a third valve; 211-pressure relief hose; 212-slurry delivery hose; 213-pressure monitoring meter; 214-a digital flow meter; 300-a test steel stand; 301-universal wheels.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The various features and embodiments described in the detailed description may be combined in any suitable manner, for example, different embodiments may be formed by combining different features/embodiments, and various combinations of features/embodiments are not separately described in order to avoid unnecessary repetition in the present disclosure.

It should be noted that the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, directly disposed, installed, connected, or indirectly disposed and connected through intervening components and intervening structures. In addition, the directions or positional relationships indicated in the present invention, such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings or the conventional placing states or using states, and are only for convenience of description and simplification of description, but do not indicate or imply that the structure, feature, device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.

As shown in fig. 1, an embodiment of the present invention provides a device for preparing a sample of a grouting stone, including a sample preparation mold 100 and a constant pressure grouting assembly 200. Wherein, the constant pressure grouting assembly 200 is directly fixed on the test steel stand 300 and connected with the sample preparation mold 100 through the slurry conveying hose 212 so as to inject the concretion slurry into the sample preparation mold. The bottom of the test steel stand 300 is provided with a plurality of universal wheels 301, which is convenient for the constant pressure grouting assembly 200 to adjust the distance relative to the sample preparation mold 100.

The constant-pressure grouting assembly 200 comprises a grouting cylinder 201, a grouting pressure control console 202, an electric pump hydraulic machine 203, a hydraulic oil cylinder 204, an oil tank 205, a grout inlet cylinder 206, an intelligent display screen 207 and the like. The oil ports of the hydraulic oil cylinder 204 are connected with the electric pump hydraulic machine 203, and the electric pump hydraulic machine 203 is connected with the oil tank 205 through hydraulic oil pipes. The piston of the grouting cylinder 201 is connected with the piston of the hydraulic oil cylinder through an end ear ring and a connecting rod connected in series so as to synchronously extend and retract, as shown in fig. 2. The hydraulic cylinder 204 is a single-rod piston type double-acting hydraulic cylinder, and can push a piston to move back and forth by changing the output pressure of pressure oil.

The grouting pressure control console 202 is a visual variable frequency speed regulator, the frequency of the input alternating current is used for regulating the rotating speed of the electric pump hydraulic machine 203, the electric pump hydraulic machine 203 is controlled to work at a constant frequency, and meanwhile, the constant-pressure push-pull of a piston of the hydraulic oil cylinder is kept, so that the piston of the grouting cylinder 201 is driven to move, and the constant-pressure output of the grout in the grouting cylinder 201 is realized.

Preferably, the working range of the design output pressure of the grouting cylinder 201 is 0-2 MPa.

The output port of the grouting barrel 201 is connected in series with three valves: the first valve 208 is a slurry inlet and is connected with the slurry inlet cylinder 206; the second valve 209 is a pressure relief port, the third valve 210 is a grout injection port, and the second valve 209 and the third valve 210 have threaded interfaces and are respectively connected with a pressure relief hose 211 and a grout delivery hose 212, which are threaded at the ends.

As a further improvement, in this embodiment, the slurry conveying hose 212 is provided with a pressure monitoring meter 213 and a digital flowmeter 214, and is connected to the system of the intelligent display screen 207 through a signal line, and the system obtains the total amount of slurry injected into the sample preparation mold 100 through calculation, so as to achieve real-time acquisition of the information of the grouting pressure and the grouting amount.

As shown in fig. 3, in the present embodiment, the sample preparation mold 100 includes an outer sleeve 101, a first inner sleeve 102, a second inner sleeve 103, a top cover 104, and a base 105. Preferably, the first inner socket 102 is made of PVC and can withstand a pressure of about 2MPa, and the second inner socket 103, the outer socket 101, the top cover 104 and the base 105 are made of stainless steel. The joint of the top cover 104 and the base 105 with the outer sleeve 101 is provided with an annular groove for splicing, and a sealing rubber ring is arranged in the annular groove for preventing pressure leakage or grout leakage.

The outer sleeve 101 is formed by two semi-cylindrical longitudinal hasps, and the outer wall is provided with a clamp. The second inner sleeve 103 is inserted into the outer sleeve 101 after being spliced with the first inner sleeve 102 up and down, and is in clearance fit with the outer sleeve 101.

The four corners of the top cover 104 are provided with holes, and the center of the top cover 104 is provided with a grouting threaded connector connected with the slurry conveying hose 212. The four corners of the base 105 are hinged with the threaded rod 106, and a drain hole is reserved in the center of the base 105. The top end of the threaded rod 106 is inserted into an opening of the top cover 104, and the top cover 104 is fixed to the base 105 by fastening with a nut.

Wherein, the base 105 is padded with a detachable permeable stone 107 which can provide a seepage channel for free water in the grouting process. Preferably, the permeable stone 107 is 44mm in diameter and 5mm in thickness, and geotechnical filter paper 44mm in diameter is laid on the permeable stone to prevent cement particles from flowing away. Lay stainless steel's circular card 108 under the permeable stone 107 to avoid permeable stone 107 to appear the fracture because of grouting pressure is too big, and circular card 108 bottom is equipped with logical groove, can discharge the unnecessary moisture of slip casting in-process.

In a preferred embodiment, before grouting, a layer of engine oil is brushed on the inner wall of the first inner sleeve 102, so that the adhesion of a grouting solid sample and the inner wall of the sleeve during demolding is reduced. After grouting, the grouting solid in the first inner sleeve 102 is a standard sample.

In the preferred embodiment, the outer sleeve 101 has an outer diameter of 60mm, an inner diameter of 45.5mm and a height of 120mm, the first inner sleeve 102 has an outer diameter of 49mm, an inner diameter of 39.1mm and a height of 80mm, and the second inner sleeve 103 has an outer diameter of 45mm, an inner diameter of 39.1mm and a height of 40 mm. After grouting, the diameter of the grouting knot body is 39.1mm, and the height of the grouting knot body is 80 mm.

Example 2:

embodiment 2 of the utility model provides an adopt embodiment 1 device's concrete system appearance method, including following step:

s1: installing a sample preparation device, preparing the slurry required by the test, and pouring the slurry into the slurry inlet cylinder 206; and (3) closing the second valve 209 and the third valve 210, opening the first valve 208, operating the grouting pressure control console 202, adjusting the working frequency of the electric pump hydraulic machine 203 to a proper value, starting the electric pump hydraulic machine, pushing the hydraulic oil cylinder 204 and the piston of the grouting barrel 201 to move backwards, and pumping the grout in the grout inlet barrel 206 into the grouting barrel 201.

S2: after the grout entering the grout barrel 206 is pumped into the grout barrel 201, stopping the electric pump hydraulic machine 203, closing the first valve 208, opening the third valve 210, operating the grouting pressure control console 202 according to the required grouting pressure, starting the electric pump hydraulic machine 203 at a constant working frequency, pushing the hydraulic oil cylinder 204 and the piston of the grout barrel 201 to move forward, and enabling the grout in the grout barrel 201 to be injected into the sample preparation mold 100 at a constant pressure.

S3: and when the grouting amount on the intelligent display screen 207 meets the test requirement, stopping the electric pump hydraulic machine 203, closing the first valve 208, slowly opening the second valve 209, relieving the pressure of the grout in the cavity and the pipeline of the constant-pressure grouting assembly 200, and copying the monitoring data stored in the intelligent display screen 207.

S4: the sample preparation mold 100 is removed and placed aside, after the grouted stone body is coagulated to a certain degree, the first inner sleeve 102 and the second inner sleeve 103 are taken out, the second inner sleeve 103 is separated from the first inner sleeve 102 through slow translation, and the grouted stone body sample in the first inner sleeve 102 is a standard sample.

S5: and according to the sample preparation quantity requirement, continuously assembling another sample preparation mould 100, and repeating the steps until the sample preparation is completely finished.

S6: clear water is added into the slurry inlet cylinder 206, water in the slurry inlet cylinder 206 is pumped into the slurry injection cylinder 201 in reference to S1, the cleaning water is discharged from the pressure relief hose 211 in reference to S2, and the process can be repeated for 2-3 times, so that the cleaning of the cavity and the pipeline is ensured.

S7: when the hardness of the grouting stone body in the first inner sleeve 102 meets the requirement of form removal, pushing the grouting stone body sample out of the sleeve by using a matched form removal column; and maintaining the test sample for a certain number of days according to the test requirement, and then carrying out mechanical performance tests such as a strength test, a triaxial penetration test and the like.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a slip casting calculus system appearance device, characterized in that, including system appearance mould (100) and constant pressure slip casting subassembly (200), constant pressure slip casting subassembly (200) with connect through defeated thick liquid hose (212) between system appearance mould (100) to in the system appearance mould (100) constant pressure injection stone body thick liquid, system appearance mould (100) include outer sleeve (101), first inner sleeve (102), second inner sleeve (103), top cap (104) and base (105), top cap (104), base (105) seal installation respectively in the both ends of outer sleeve (101), seted up on top cap (104) with the joint that defeated thick liquid hose (212) are connected, seted up the wash port on base (105), first inner sleeve (102), second inner sleeve (103) are laid inside and down outer sleeve (101), And the grouting knot entity in the first inner sleeve (102) after grouting is a manufactured standard sample.

2. The device for sampling grouting stones according to claim 1, wherein the constant pressure grouting assembly (200) is mounted on a test steel stand (300), and a plurality of universal wheels (301) are arranged at the bottom of the test steel stand (300) so that the constant pressure grouting assembly (200) can adjust the distance between the constant pressure grouting assembly and the sampling mold (100).

3. The grouting stone sample preparation device according to claim 1, wherein the constant pressure grouting assembly (200) comprises a grouting barrel (201), a grouting pressure control console (202), an electric pump hydraulic machine (203), a hydraulic oil cylinder (204), an oil tank (205) and a slurry inlet barrel (206), the hydraulic oil cylinder (204) is connected with the electric pump hydraulic machine (203), the electric pump hydraulic machine (203) and the oil tank (205) through hydraulic oil pipes, a piston is arranged in the grouting barrel (201) and is associated with the piston of the hydraulic oil cylinder (204) to synchronously extend and retract, the grouting pressure control console (202) is used for adjusting the rotation speed of the electric pump hydraulic machine (203) and controlling the electric pump hydraulic machine (203) to work at constant frequency and pressure, a first valve (208), a second valve (209) and a third valve (210) are arranged at an output port of the grouting barrel (201), the first valve (208) is connected with the pulp inlet cylinder (206), the second valve (209) is connected with the pressure relief hose (211), and the third valve (210) is connected with the pulp conveying hose (212).

4. The grouting stone sample preparation device according to claim 3, wherein a pressure monitoring meter (213) and a digital flowmeter (214) are arranged on the grouting hose (212), and the pressure monitoring meter (213) and the digital flowmeter (214) are connected with the intelligent display screen (207) through signal lines to realize real-time acquisition and display of grouting pressure and grouting amount information.

5. A slurry stone body sampling device according to claim 1, characterized in that the outer sleeve (101) is formed by longitudinally snapping two half cylinders, the outer wall of the outer sleeve (101) is provided with a clamp, and the second inner sleeve (103) and the first inner sleeve (102) are in clearance fit with the outer sleeve (101).

6. The grouting stone body sampling device according to claim 1, characterized in that openings are formed at the diagonal positions of the top cover (104), the diagonal positions of the base (105) are respectively hinged with a threaded rod (106), the top end of the threaded rod (106) is inserted into the opening of the top cover (104), and the top cover (104) and the base (105) are fixed through locking of a nut.

7. The grouting stone system sample preparation device as claimed in claim 1, wherein the base (105) is padded with a detachable permeable stone (107) to provide a free water seepage passage during grouting, geotechnical filter paper is paved on the permeable stone (107) to prevent loss of cement particles, a circular clamping piece (108) is arranged below the permeable stone (107) to prevent cracking of the permeable stone (107) caused by excessive grouting pressure, and a through groove for draining water is arranged at the bottom of the circular clamping piece (108).

8. A slurry-cast stone sample preparation device according to claim 1, characterized in that the inner wall of said first inner sleeve (102) is brushed with a layer of oil before the slurry is injected, so as to reduce adhesion of the slurry-cast stone sample to the inner wall of the sleeve during demolding.