Device and method for measuring fluidity of cement-based grouting material

Abstract

The invention discloses a device and a method for measuring the fluidity of a cement-based grouting material, and aims to provide a device and a method for measuring the fluidity of the cement-based grouting material, which are not limited by field flatness, can meet the measurement requirement of high fluidity and can accurately evaluate the fluidity of the cement-based grouting material. A device for measuring fluidity of a cement-based grouting material comprises: a cement-based grouting material preparation device, which comprises a material preparation cylinder; the residual pressure measuring device comprises a material receiving barrel and an upper infrared distance recorder, the upper end of the material receiving barrel is open, the upper infrared distance recorder is located at the opening of the upper end of the material receiving barrel, and the observation range of the upper infrared distance recorder covers an inner cavity of the whole material receiving barrel; the fluidity measuring device comprises a measuring slim tube and a lower infrared distance recorder, the measuring slim tube is connected with the bottom of the material preparation barrel and the bottom of the material receiving barrel, and the observation range of a lower infrared distance penetrates through an inner cavity of the whole measuring slim tube in the axial direction of the measuring slim tube.

Description

Technical Field

[0001] The present invention relates to the field of cement-based grouting materials, and particularly to a measuring device and a measuring method for the fluidity of cement-based grouting materials. Background Art

[0002] At present, cement-based grouting materials are widely used in various infrastructure projects. In order to cope with the complex situations of various projects, various additional-performance cement-based grouting materials have been developed and applied. In repair and reinforcement projects, such as cracks and pile foundation filling, the grouting process is widely used due to its high repair efficiency and adaptability to complex working conditions. Among them, in some small-scale foundation projects, such as power supply tower projects, small pile foundations formed by filling with cement-based grouting materials after drilling. Due to the high fluidity of the cement-based grouting materials and the relatively high strength of the materials themselves, the small pile foundations fit well with the soil foundation, not only meeting the project requirements of the pile foundations but also avoiding a large amount of earth excavation. Cement-based grouting materials are composed of raw materials such as cementitious materials, aggregates, and admixtures mixed in proportion. After adding water and stirring, a uniform and highly fluid slurry will be formed. Since the grouting process requires the cement-based grouting materials to flow into various harsh positions, such as narrow cracks and soil pits, the fluidity of cement-based grouting materials is often regarded as a basic condition for the grouting process.

[0003] For the measurement of the fluidity of cement-based grouting materials, the currently widely used traditional measurement method is the slump flow test. The traditional slump flow test requires a slump cone and a glass plate. Place the slump cone on a flat glass plate, pour the slurry into the slump cone, lift the slump cone, and let the slurry flow naturally. Finally, measure the spread diameter at 30 seconds of flow. When measuring the high-fluidity cement-based grouting materials by the slump flow test, the following problems will be encountered: (1) It has high requirements for the flatness of the test site, and the test results are greatly affected by the flatness of the site. Specifically, different from traditional concrete, traditional concrete can be prepared in factories and measured using the ready-made test sites and equipment in factories. However, in order to meet the requirements of the grouting process, cement-based grouting materials often need to be prepared and measured for fluidity on the construction site. But the slump flow test requires a flat site and the material to flow as evenly as possible in all directions, which is often difficult to meet on the construction site. Moreover, the high fluidity of cement-based grouting materials will increase the requirements for the flatness of the site. With a slight deviation on one side, the difference in test results will be extremely large.

[0004] (2) The test glass plate surface quality requirements are very high, and the test results are easily affected by the test glass plate surface quality. Specifically, the flowability of cement-based grouting material is much stronger than that of traditional cement mortar, and the expansion area is often more than twice that of traditional mortar. This high fluidity places high demands on the surface quality of the test glass plate. If the glass plate is slightly scratched, it will destroy the surface tension of the cement-based grouting material, causing the cement-based grouting material to flow along the scratch, generating an irregular shape, resulting in errors in the test results.

[0005] (3) The evaluation scope is limited. It is difficult to accurately characterize the flow properties of cement-based grouting materials. Specifically, the slump expansion test tests the flow properties of the material when it naturally leveled under its own weight. For traditional cement-based grouting materials with low fluidity, this method is sufficient to evaluate the process requirements of the material. However, for cement-based grouting materials that need to penetrate into various harsh cracks, this intuitive method is difficult to accurately characterize its flow properties. And when the fluidity of cement-based grouting materials is too high, the slump expansion test is difficult to distinguish the flow properties of cement-based grouting materials.

[0006] In view of this, a test device is needed that can comprehensively measure the fluidity of cement-based grouting materials without being subject to test site requirements. The device should be able to distinguish the high fluidity of cement-based grouting materials, and the test results should be able to accurately evaluate the fluidity performance of cement-based grouting materials. Summary of the invention

[0007] The purpose of the present invention is to provide a device and method for measuring the fluidity of cement-based grouting material, which is not restricted by the flatness of the site, can meet the measurement requirements of high fluidity, and can accurately evaluate the fluidity performance of the cement-based grouting material.

[0008] The technical solution of the present invention is: A device for measuring fluidity of cement-based grouting material, comprising: A cement-based grouting material preparation device, comprising a material preparation barrel; The residual pressure measuring device comprises a receiving barrel and an upper infrared distance recorder. The upper end of the receiving barrel is open. The upper infrared distance recorder is located at the upper end opening of the receiving barrel or above the upper end opening of the receiving barrel. The observation range of the upper infrared distance recorder covers the entire inner cavity of the receiving barrel. The fluidity measuring device comprises a measuring capillary connecting the bottom of a material preparation barrel and the bottom of a material receiving barrel and a lower infrared distance recorder. The lower infrared distance recorder and the material receiving barrel are located on the same side of the material preparation barrel. The observation range of the lower infrared distance runs through the entire inner cavity of the measuring capillary along the axial direction of the measuring capillary.

[0009] The specific measurement method of the device for measuring the fluidity of cement-based grouting material applying this solution can be found in the following cement-based grouting material fluidity measurement method. It innovatively sets up a device that provides a pressure difference (measures the pressure difference at both ends of the measuring capillary) through the height difference of the cement-based grouting material to drive the cement-based grouting material to flow in the measuring capillary. The lower infrared distance recorder is used to record the flow parameters of the cement-based grouting material flowing from the preparation cylinder into the measuring capillary, and obtain the average flow velocity of the cement-based grouting material in the measuring capillary at each flow distance l. And the viscosity η and initial shear yield strength τ0 of the cement-based grouting material are calculated through the viscosity η formula and the initial shear yield strength τ0 formula, so as to accurately evaluate the flow performance of the cement-based grouting material. At the same time, providing a pressure difference through the height difference of the cement-based grouting material to drive the cement-based grouting material to flow in the measuring capillary, it can be unrestricted by the site flatness, breaking through the limitations of the traditional slump spread test on the site flatness, the surface quality requirements of the test glass plate, the site size, and the flow shape; it can meet the measurement requirements of high fluidity and accurately evaluate the flow performance of the cement-based grouting material.

[0010] Preferably, the lower infrared distance recorder is used to record the flow parameters of the cement-based grouting material flowing from the preparation cylinder into the measuring capillary, and the flow parameters include the flow time t and the flow distance l.

[0011] Preferably, the upper infrared distance recorder records the liquid level rising parameters of the cement-based grouting material flowing from the measuring capillary into the receiving cylinder, and the liquid level rising parameters include the rising time and the rising distance.

[0012] Preferably, a discharge port is provided at the lower part of the preparation cylinder, one end of the measuring capillary is connected to the discharge port, and a discharge port gate for controlling the on-off of the discharge port is provided at the discharge port. In this way, the flow of the cement-based grouting material in the preparation cylinder into the measuring capillary can be controlled through the discharge port gate, and the accuracy of the parameters obtained by the flow performance measurement method of the cement-based grouting material can be improved.

[0013] Preferably, the discharge port gate includes a lifting gate arranged in the preparation cylinder, a clamping block arranged at the top of the lifting gate, and a clamping block support rod hinged to the upper end of the preparation cylinder. The lifting gate closely abuts against the inner wall of the preparation cylinder where the discharge port is located. In this way, the on-off of the discharge port is controlled by the lifting of the lifting gate, and the operation is convenient.

[0014] Preferably, the fluidity measurement device further includes a camera, and the shooting range of the camera covers the entire measuring capillary. Since the flow position of the cement-based grouting material in the measuring capillary is very important, a dual guarantee of recording by the camera and the lower infrared distance recorder is adopted to record the flow position of the cement-based grouting material in the measuring capillary together.

[0015] Preferably, the measuring capillary tube is provided with axially extending scale lines, the material receiving cylinder is vertically distributed, and the material receiving cylinder is provided with vertically distributed scale lines.

[0016] Preferably, the lower infrared distance recorder is installed at the bottom of the outer wall of the material receiving cylinder through a lower bracket, and the material receiving cylinder is a transparent material receiving cylinder; the upper infrared distance recorder is installed at the upper opening of the material receiving cylinder through an upper bracket.

[0017] A method for measuring the fluidity of cement-based grouting material using a measuring device for the fluidity of cement-based grouting material is characterized by successively including the following steps: Pour a set amount of cement-based grouting material into the preparation cylinder. The cement-based grouting material in the preparation cylinder flows into the measuring capillary tube and then into the material receiving cylinder; during this process, the lower infrared distance recorder records the flow parameters of the cement-based grouting material in the measuring capillary tube, and the flow parameters include the flow time t and the flow distance l. According to the flow time t and the flow distance l recorded by the lower infrared distance recorder, the average flow velocity of the cement-based grouting material in the measuring capillary tube at each flow distance l is obtained. The method for measuring the fluidity of cement-based grouting material in this solution can accurately obtain the average flow velocity of the cement-based grouting material. (The average flow velocity of the cement-based grouting material in each flow distance l of the measuring capillary tube ), by comparing the average flow velocity of the cement-based grouting material the flow performance of the cement-based grouting material can be accurately evaluated.

[0018] A method for measuring the fluidity of cement-based grouting material using a measuring device for the fluidity of cement-based grouting material is characterized by successively including the following steps: Pour a set amount of cement-based grouting material into the preparation cylinder. The cement-based grouting material in the preparation cylinder flows into the measuring capillary tube and then into the material receiving cylinder; during this process, the lower infrared distance recorder records the flow parameters of the cement-based grouting material in the measuring capillary tube, and the flow parameters include the flow time t and the flow distance l; the upper infrared distance recorder records the liquid level rising parameters of the cement-based grouting material flowing into the material receiving cylinder, and the liquid level rising parameters include the rising time and the rising distance. According to the flow time t and the flow distance l recorded by the lower infrared distance recorder, the average flow velocity of the cement-based grouting material in the measuring capillary tube at each flow distance l is obtained. Obtain the curve of the flow distance l and the average flow velocity ; According to the viscosity η formula: Calculate the viscosity η of the cement-based grouting material. According to the formula for the initial shear yield strength τ0: The initial shear yield strength τ0 of the cementitious grout is calculated. In the formula: VP is the pressure difference between the two ends of the measuring capillary tube; l is the flow distance of the cementitious grout in the measuring capillary tube; R is the inner hole radius of the measuring capillary tube; is the average flow velocity; k is the curve slope of the flow distance l and the average flow velocity .

[0019] The method for measuring the fluidity of the cementitious grout in this solution can accurately obtain the viscosity η and the initial shear yield strength τ0 of the cementitious grout, and then compare them with the fluidity range (viscosity η and initial shear yield strength τ0) of the qualified cementitious grout, so as to accurately evaluate the flow performance of the cementitious grout.

[0020] The beneficial effects of the present invention are: A measuring device and a measuring method for promoting the flow of the cementitious grout in the measuring capillary tube by providing a pressure difference through the height difference of the cementitious grout are innovatively set up, which can be unrestricted by the site flatness and can meet the measurement requirements of high fluidity, breaking through the limitations of the traditional slump spread test on the site flatness, the surface quality of the test glass plate, the site size, and the flow shape.

[0021] Compared with the traditional slump spread test, the parameters measured by the fluidity measurement method of the present invention are more accurate, so the flow performance of the cementitious grout can be accurately evaluated. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of a measuring device for the fluidity of a cementitious grout of the present invention.

[0023] Figure 2 is a schematic structural diagram after the cementitious grout is poured into the preparation cylinder in a method for measuring the fluidity of a cementitious grout of the present invention.

[0024] Figure 3 is a schematic structural diagram after the cementitious grout flows into the measuring capillary tube in a method for measuring the fluidity of a cementitious grout of the present invention.

[0025] Figure 4 is a schematic structural diagram after the cementitious grout flows into the receiving cylinder in a method for measuring the fluidity of a cementitious grout of the present invention.

[0026] Figure 5The flow distance l and the average flow velocity obtained by a method for measuring the fluidity of a cement-based grouting material using the present invention are shown in the curve graph.

[0027] In the figure: Cement-based grouting material preparation device 1, stock preparation cylinder 1.1, lifting gate 1.2, clamping block 1.3, clamping block support rod 1.4, lifting gate limit block 1.5; Fluidity measuring device 2, measuring capillary 2.1, lower infrared distance recorder 2.2, lower bracket 2.3, camera 2.4; Residual pressure measuring device 3, receiving cylinder 3.1, upper infrared distance recorder 3.2, upper bracket 3.3; Base 4. Specific implementation mode

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes: Specific embodiment 1, as Figure 1 shown, a device for measuring the fluidity of a cement-based grouting material includes a cement-based grouting material preparation device 1, a residual pressure measuring device 3 and a fluidity measuring device 2. The cement-based grouting material preparation device 1 includes a stock preparation cylinder 1.1. The bottom of the stock preparation cylinder is provided with a discharge port. A discharge port gate for controlling the on / off of the discharge port is provided at the discharge port. The upper end of the stock preparation cylinder is open, and the lower end of the stock preparation cylinder is closed.

[0029] The residual pressure measuring device 3 includes a receiving cylinder 3.1 and an upper infrared distance recorder 3.2. The upper end of the receiving cylinder is open, and the lower end of the receiving cylinder is closed. The upper infrared distance recorder is located at the upper opening of the receiving cylinder or above the upper opening of the receiving cylinder. In this embodiment, the upper infrared distance recorder is installed at the upper opening of the receiving cylinder through an upper bracket 3.3. The probe of the upper infrared distance recorder faces the inner cavity of the receiving cylinder, and the observation range of the upper infrared distance recorder covers the entire inner cavity of the receiving cylinder. The upper infrared distance recorder measures the liquid level rising parameters of the cement-based grouting material flowing into the receiving cylinder through the measuring capillary. The liquid level rising parameters include but are not limited to the rising speed, rising time and rising distance.

[0030] The fluidity measuring device 2 includes a measuring capillary 2.1 and a lower infrared distance recorder 2.2. The measuring capillary connects the bottom of the feeding cylinder and the bottom of the receiving cylinder. In this embodiment, the measuring capillary connects the discharge port at the bottom of the feeding cylinder and the bottom of the receiving cylinder. The lower infrared distance recorder and the receiving cylinder are on the same side of the feeding cylinder, and the observation range of the lower infrared distance runs through the entire inner cavity of the measuring capillary along the axial direction of the measuring capillary. In this embodiment, the lower infrared distance recorder is installed at the bottom of the outer wall of the receiving cylinder through a lower bracket 2.3, and the receiving cylinder is a transparent receiving cylinder. The probe of the lower infrared distance recorder faces the inner hole of the measuring capillary. The lower infrared distance recorder is used to record the flow parameters of the cement-based grouting material flowing from the feeding cylinder into the measuring capillary, and the flow parameters include but are not limited to the flow time t and the flow distance l.

[0031] For the specific measuring method of the cement-based grouting material fluidity measuring device applying this solution, see the cement-based grouting material fluidity measuring method below. It creatively sets a device that provides a pressure difference (the pressure difference at both ends of the measuring capillary) through the height difference of the cement-based grouting material to push the cement-based grouting material to flow in the measuring capillary. The lower infrared distance recorder is used to record the flow parameters of the cement-based grouting material flowing from the feeding cylinder into the measuring capillary, and the average flow velocity of the cement-based grouting material in the measuring capillary within each flow distance l is obtained. And the viscosity η and the initial shear yield strength τ0 of the cement-based grouting material are calculated through the viscosity η formula and the initial shear yield strength τ0 formula, so as to accurately evaluate the flow performance of the cement-based grouting material. At the same time, providing a pressure difference through the height difference of the cement-based grouting material to push the cement-based grouting material to flow in the measuring capillary can be not restricted by the site flatness, breaking through the limitations of the traditional slump spread test on the site flatness, the surface quality of the test glass plate, the site size, and the flow shape; it can meet the measurement requirements of high fluidity and accurately evaluate the flow performance of the cement-based grouting material.

[0032] Specifically, a cement-based grouting material fluidity measuring device further includes a base 4. The cement-based grouting material preparation device, the residual pressure measuring device, and the fluidity measuring device are all installed on the base.

[0033] The measuring capillary is provided with scale lines extending axially. The measuring capillary is a transparent circular tube. The measuring capillary is parallel to the upper surface of the base. The receiving cylinder is vertically distributed, and the receiving cylinder is provided with vertically distributed scale lines.

[0034] The fluidity measuring device further includes a camera 2.4. The camera is installed on the base through a camera bracket. The shooting range of the camera covers the entire measuring capillary. Since the flow position of the cement-based grouting material in the measuring capillary is very important, a double guarantee of recording by the camera and the lower infrared distance recorder is adopted to record the flow position of the cement-based grouting material in the measuring capillary together.

[0035] like Figure 1 As shown, the discharge port gate includes a lifting gate 1.2 arranged in the material preparation barrel, a block 1.3 arranged on the top of the lifting gate and a block support rod 1.4 hinged on the upper end of the material preparation barrel, and the lifting gate is close to the inner wall of the material preparation barrel where the discharge port is located. In this embodiment, the material preparation barrel is a cylinder, and the cross-section of the lifting gate is correspondingly arc-shaped. A plurality of lifting gate limit blocks 1.5 distributed from bottom to top are provided on the inner wall of the material preparation barrel, and the lifting gate is located between the lifting gate limit block and the inner wall of the material preparation barrel where the discharge port is located, so that the lifting gate is close to the inner wall of the material preparation barrel where the discharge port is located. In this way, the discharge port is controlled by lifting and lowering the lifting gate, and the operation is convenient. Specifically, as Figure 3 As shown, when the lifting gate rises above the discharge port, the discharge port is opened. At this time, the block support rod can be rotated to make the block support rod vertical, and the block is against the upper end of the block support rod, thereby supporting the column lifting gate.

[0036] Of course, the discharge port gate may also be other manual valves or electric valves in the prior art, such as a manual gate valve or an electric gate valve.

[0037] Specific embodiment 2 is a method for measuring the fluidity of cement-based grouting material using a device for measuring the fluidity of cement-based grouting material, wherein the specific structure of the device for measuring the fluidity of cement-based grouting material refers to specific embodiment 1.

[0038] A method for measuring the fluidity of cement-based grouting material using a device for measuring the fluidity of cement-based grouting material comprises the following steps in sequence: First, as Figure 2 As shown, the discharge port is closed through the discharge port gate; a set amount of cement-based grouting material is poured into the preparation barrel.

[0039] Second, if Figure 3 As shown, the discharge port is opened through the discharge port gate, and the cement-based grouting material in the preparation barrel flows into the measuring capillary, and then flows into the receiving barrel; in this process, the flow parameters of the cement-based grouting material in the measuring capillary are recorded by the lower infrared distance recorder, and the flow parameters include the flow time t and the flow distance l.

[0040] According to the flow time t and flow distance l recorded by the infrared distance recorder, the average flow velocity of the cement-based grouting material in the measuring capillary within each flow distance l is obtained.

[0041] The cement-based grouting material fluidity measurement method in this embodiment can accurately obtain the average flow rate of the cement-based grouting material. (Measure the average flow velocity of the cement-based grouting material in the capillary tube within each flow distance l ), by comparing the average flow velocity of the cementitious grout to accurately evaluate the flow performance of the cementitious grout.

[0042] Specific Example 3, a method for measuring the fluidity of a cementitious grout using a measuring device for the fluidity of a cementitious grout, wherein the specific structure of the measuring device for the fluidity of a cementitious grout refers to Specific Example 1.

[0043] A method for measuring the fluidity of a cementitious grout using a measuring device for the fluidity of a cementitious grout, characterized by successively including the following steps: First, as Figure 2 shown, close the discharge port through the discharge port gate; pour a set amount of cementitious grout into the preparation cylinder.

[0044] Second, as Figure 3 shown, open the discharge port through the discharge port gate, and the cementitious grout in the preparation cylinder flows into the measuring capillary tube and then into the receiving cylinder; during this process, record the flow parameters of the cementitious grout in the measuring capillary tube through the lower infrared distance recorder, and the flow parameters include the flow time t and the flow distance l; record the liquid level rising parameters of the cementitious grout flowing into the receiving cylinder through the upper infrared distance recorder, and the liquid level rising parameters include the rising time and the rising distance.

[0045] As Figure 4 shown, after the cementitious grout fills the measuring capillary tube and after a set time (for example, 1 minute), export the data of the upper and lower infrared distance recorders. According to the data of the flow time t and the flow distance l recorded by the lower infrared distance recorder, obtain the average flow velocity of the cementitious grout in the measuring capillary tube at each flow distance l According to the flow distance l and the average flow velocity The curve of the flow distance l and the average flow velocity fitted from the data points, as Figure 5 shown ( Figure 5 The average flow velocity of the cementitious grout in )).

[0046] According to the viscosity η formula: Calculate the viscosity η of the cementitious grout; According to the initial shear yield strength τ0 formula: Calculate the initial shear yield strength τ0 of the cementitious grout; In the formula: VP is the pressure difference between both ends of the measuring capillary tube; l is the flow distance of the cementitious grout in the measuring capillary tube; R is the inner hole radius of the measuring capillary tube; is the average flow velocity of the cement-based grouting material, that is, the average flow velocity of the cement-based grouting material within the corresponding flow distance l; k is the curve slope of the flow distance l and the average flow velocity That is, k is the tangent slope of the point on the curve corresponding to the flow distance l (this curve is the curve of the flow distance l and the average flow velocity curve).

[0047] The method for measuring the fluidity of the cement-based grouting material in this solution can accurately obtain the viscosity η and the initial shear yield strength τ0 of the cement-based grouting material, and then compare them with the fluidity range (viscosity η and initial shear yield strength τ0) of the qualified cement-based grouting material, so as to accurately evaluate the flow performance of the cement-based grouting material.

[0048] In this embodiment, the viscosity η formula and the initial shear yield strength τ0 formula of the cement-based grouting material are derived through the Bingham model and the Poiseuille theorem. Specifically, the Bingham model is used as the shear model of the cement-based grouting material, that is: Among them, τ is the shear stress, unit Pa; τ0 is the initial shear yield stress, unit Pa; η is the viscosity, unit Pa·s; v is the flow velocity, unit m / s; r is the distance between each point on the cross-section of the inner hole of the pipeline and the axis of the pipeline, unit m.

[0049] According to the Poiseuille theorem, when the fluid flows in the pipeline, the pressure difference on both sides is balanced with the frictional force given by the pipeline, so: Among them, VP is the pressure difference at both ends of the pipeline; l is the flow distance of the liquid in the pipeline. Formula (2) is changed to formula (3): Integrating formula (3) gives formula (4): Among them, R is the inner hole radius of the pipeline. Formula (4) is the flow velocity at different positions in the pipeline. Integrating the product of the flow velocity and the area at different positions can obtain the flow rate q: dq = vds = v2πrdr (5) Then the average flow velocity is: Taking the derivative of formula (7) with respect to l gives formula (8), that is, the viscosity η formula: After substituting formula (8) into formula (7), it is transformed into formula (9), which is the initial shear yield strength τ0 formula: The above are only the preferred embodiments of the present invention, and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent transformations made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A measuring device for the fluidity of a cement-based grouting material, characterized in that, Comprising: A grouting material preparation device, which includes a stock preparation cylinder; A residual pressure measuring device, which includes a material receiving cylinder and an upper infrared distance recorder. The upper end of the material receiving cylinder is open, and the upper infrared distance recorder is located at the upper end opening of the material receiving cylinder or above the upper end opening of the material receiving cylinder. The observation range of the upper infrared distance recorder covers the entire inner cavity of the material receiving cylinder; A fluidity measuring device, which includes a measuring capillary connecting the bottom of the stock preparation cylinder and the bottom of the material receiving cylinder and a lower infrared distance recorder. The lower infrared distance recorder and the material receiving cylinder are on the same side of the stock preparation cylinder. The observation range of the lower infrared distance runs through the entire inner cavity of the measuring capillary along the axial direction of the measuring capillary.

2. The measuring device for the fluidity of a cement-based grouting material according to claim 1, characterized in that, The lower infrared distance recorder is used to record the flow parameters of the cement-based grouting material flowing from the stock preparation cylinder into the measuring capillary. The flow parameters include the flow time t and the flow distance l.

3. The measuring device for the fluidity of a cement-based grouting material according to claim 1, characterized in that, The upper infrared distance recorder records the liquid level rising parameters of the cement-based grouting material flowing from the measuring capillary into the material receiving cylinder. The liquid level rising parameters include the rising time and the rising distance.

4. The measuring device for the fluidity of the cement-based grouting material according to claim 1 or 2 or 3, characterized in that, An outlet is provided at the lower part of the stock preparation cylinder. One end of the measuring capillary is connected to the outlet, and an outlet gate for controlling the on-off of the outlet is provided at the outlet.

5. The measuring device for the fluidity of a cement-based grouting material according to claim 4, characterized in that, The outlet gate includes a lifting gate arranged in the stock preparation cylinder, a clamping block arranged at the top of the lifting gate, and a clamping block support rod hinged to the upper end of the stock preparation cylinder. The lifting gate is closely attached to the inner wall of the stock preparation cylinder where the outlet is located.

6. The measuring device for the fluidity of a cement-based grouting material according to claim 1 or 2 or 3, characterized in that, The fluidity measuring device further includes a camera, and the shooting range of the camera covers the entire measuring capillary.

7. A measuring device for the fluidity of a cement-based grouting material according to claim 1 or 2 or 3, characterized in that, Axially extending scale lines are provided on the measuring capillary, the material receiving cylinder is vertically distributed, and vertically distributed scale lines are provided on the material receiving cylinder.

8. A measuring device for the fluidity of a cement-based grouting material according to claim 1 or 2 or 3, characterized in that, The lower infrared distance recorder is installed at the bottom of the outer wall of the material receiving cylinder through a lower bracket, and the material receiving cylinder is a transparent material receiving cylinder; the upper infrared distance recorder is installed at the upper end opening of the material receiving cylinder through an upper bracket.

9. A method for measuring the fluidity of a cement-based grouting material using the measuring device for the fluidity of a cement-based grouting material according to any one of claims 1-8, characterized in that, Sequentially including the following steps, Pour a set amount of cement-based grouting material into the stock preparation cylinder; The cement-based grouting material in the stock preparation cylinder flows into the measuring capillary and then into the material receiving cylinder; during this process, the flow parameters of the cement-based grouting material in the measuring capillary are recorded by the lower infrared distance recorder. The flow parameters include the flow time t and the flow distance l; According to the flow time t and the flow distance l recorded by the lower infrared distance recorder, the average flow velocity of the cement-based grouting material in the thin tube within each flow distance l is obtained.

10. A method for measuring the fluidity of a cement-based grouting material using the measuring device for the fluidity of a cement-based grouting material according to any one of claims 1-8, characterized in that, Sequentially including the following steps, Pour a set amount of cement-based grouting material into the stock preparation cylinder; The cement-based grouting material in the stock preparation cylinder flows into the measuring capillary and then into the material receiving cylinder; during this process, the flow parameters of the cement-based grouting material in the measuring capillary are recorded by the lower infrared distance recorder. The flow parameters include the flow time t and the flow distance l; the liquid level rising parameters of the cement-based grouting material flowing into the material receiving cylinder are recorded by the upper infrared distance recorder. The liquid level rising parameters include the rising speed, the rising time and the rising distance; According to the flow time t and the flow distance l recorded by the lower infrared distance recorder, the average flow velocity of the cement-based grouting material in the thin tube within each flow distance l is obtained. Obtain the flow distance l and the average flow velocity of the curve; According to the viscosity η formula: Calculate the viscosity η of the cement-based grouting material; According to the formula for the initial shear yield strength τ0: Calculate the initial shear yield strength τ0 of the cement-based grouting material; Where: VP is the pressure difference between both ends of the measuring capillary; l is the flow distance of the cement-based grouting material in the measuring capillary; R is the inner hole radius of the measuring capillary; is the average flow velocity; k is the curve slope of the flow distance l and the average flow velocity v.

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