Grout fluidity testing device

Abstract

To provide a grout fluidity testing device by which a JA funnel and a JP funnel can be used, capable of accurately specifying a timing of beginning and end of flowing of a grout, and efficiently measuring a flow-down time of the grout with high accuracy.SOLUTION: A grout fluidity testing device 1 includes: a device body 2 which is composed of a support member 3 and a funnel holding part 4, and vertically holds a JA funnel and a JP funnel; a measurement device 5 for measuring a flow-down time of a grout flowing down from the outflow port of the JA funnel and the JP funnel; a support tool 6 for supporting the measurement device 5; a container 7 installed below the support tool 6; and detection means and timing means which are built in the measurement device 5.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a device used in grout fluidity testing, and in particular to a grout fluidity testing device that can use two types of funnels of different sizes, namely, a JA funnel and a JP funnel, and that can accurately identify the timing at which the grout starts and stops flowing, thereby efficiently measuring the grout flow time with high precision. [Background technology]

[0002] When cavities, gaps, or cracks occur during construction or civil engineering work, a liquid material called grout, which has excellent strength and water resistance, is injected into them. The grout used in structures made of prestressed concrete is called PC grout, and the Japan Society of Civil Engineers has established a standard (JSCE-F 541-1999) for its fluidity testing. This standard specifies two types of brass funnels, which should be used depending on the fluidity of the grout.

[0003] Figures 8(a) and 8(b) are external views showing the shape and dimensions of a JA funnel 50 and a JP funnel 51, respectively, used in PC grout fluidity tests. As shown in Figure 8(a), the JA funnel 50 is 3 mm thick and 351.1 mm high, with inner diameters of 100 mm and 8 mm at the top and bottom, respectively, and a 30 mm long outlet 50a with an inner diameter of 8 mm (outer diameter of 14 mm) at the bottom. As shown in Figure 8(b), the JP funnel 51 is 3 mm thick and 392 mm high, with inner diameters of 70 mm and 14 mm at the top and bottom, respectively, and a 30 mm long outlet 51a with an inner diameter of 14 mm (outer diameter of 20 mm) at the bottom.

[0004] In the fluidity test, the time required for the grout contained in the JA funnel 50 or JP funnel to completely flow out of the outlets 50a, 51a (flow time) is measured with a stopwatch while the outlets 50a, 51a are blocked with a finger. Measurement is usually started when the finger is removed from the outlets 50a, 51a, assuming that the grout has started to flow. When using the JA funnel 50, the stopwatch is stopped when the grout no longer flows out of the outlet 50a. When using the JP funnel 51, the stopwatch is stopped when the flow of grout flowing out of the outlet 51a suddenly narrows. As described above, grout flowability tests have the problem of inefficient work, since the measurement method differs depending on the type of funnel, and a tripod is required for each funnel. Also, because the start and end points of the grout flow are determined visually, there is a problem of inconsistency in the measurement results, not only when different people measure, but even when the same person measures.

[0005] Regarding technology related to grout fluidity testing, for example, Patent Document 1 discloses an invention entitled "Flow Value Measuring Device" that relates to a device used in fluidity testing of cement-based injection materials such as anchor grout materials and injection mortar for prepacked concrete. Using the reference numerals shown in the drawings of Patent Document 1, the flow value measuring device 1 disclosed in Patent Document 1 is configured to include a funnel 10, a main body 20 that holds the funnel 10 vertically, an opening / closing mechanism 30 that opens and closes the outlet 11 of the funnel 10, legs 22 that hold the support 21 that supports the funnel 10 vertically, a sample detector 40 that detects the sample flowing down from the outlet 11, and a measuring device 50 that measures the time it takes for the sample to flow down based on the output of the sample detector 40. Patent Document 1 also describes that the sample detector 40 is configured with a light source 41 and a light receiving unit 42 that uses a known photosensor that is turned on and off depending on the amount of light and is composed of a CdS (cadmium chloride) film, a comparator circuit, and a relay. With this structure, measurement errors caused by the operator are unlikely to occur, and the flow value can be measured accurately.

[0006] Furthermore, Patent Document 2 discloses an invention entitled "Method for Measuring Viscosity of Viscous Fluid" that relates to a method for measuring the viscosity of cement grout used in making prestressed concrete. Using the symbols shown in the drawings of Patent Document 2, Patent Document 2 describes a viscosity measuring device 10 that includes a funnel-shaped measuring vessel 11 with a downflow port 14 at its bottom, a storage vessel 12 disposed below the measuring vessel 11, a lid 15 for opening and closing the downflow port 14, and a sensor 17 that includes a laser light projecting element 18 and a light receiving element 19 and that is installed away from the path of the viscous fluid L flowing down into the storage vessel 12 to detect the liquid level of the viscous fluid L in the storage vessel 12. Also, Figures 5 and 6 and the specification state that the device is provided with a weight measuring device 20 such as a load cell that measures the weight of the storage vessel 12, and that the time Tx at which the amount of change in the weight of the storage vessel 12 suddenly decreases is considered to be the downflow time of the viscous fluid L. According to this method, the flow time of the viscous fluid can be measured accurately, and therefore the accuracy of the viscosity measurement of the viscous fluid is improved.

[0007] Furthermore, Patent Document 3 discloses an idea for a device entitled "Concrete Quality Testing Device" that can accurately and quickly test the quality of concrete while reducing the amount of manual testing. Using the symbols shown in the drawings of Patent Document 3, Patent Document 3 describes a testing device that includes a funnel-shaped slump cone 4 whose lower opening is opened and closed by an opening and closing plate 5, a guide support plate 6 that supports the opening and closing plate 5, detectors 7, 7a arranged opposite each other on both sides of the lower opening of the slump cone 4, and a judgment unit 72 that judges the time that infrared or ultraviolet light emitted from the detector 7 is blocked by concrete falling from the slump cone 4. With this structure, the test vessel is supported upright by the holder and the bottom opening is opened by the opening and closing plate, making the test operation easy. In addition, the detector measures the concrete's falling time, making it possible to accurately grasp the concrete's viscosity. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 10-232193 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-289767 [Patent Document 3] Japanese Utility Model Application Publication No. 5-30758 Summary of the Invention [Problem to be solved by the invention]

[0009] In the invention disclosed in Patent Document 1, the sample flowing down from the outlet 11 of the funnel 10 is detected by an optical sensor, so the timing when the sample starts and stops flowing can be accurately determined. However, there is also the problem that it is not possible to perform tests using a JP funnel, which determines the end of the sample flow when the sample flow suddenly narrows. Furthermore, the invention disclosed in Patent Document 2 had the problem of poor work efficiency when measuring the viscosity of a viscous fluid, because it required the preparation of two types of measuring containers 11, each having the same shape as the JA funnel and JP funnel shown in Figures 8(a) and 8(b), and two types of tripods for holding the measuring containers 11. Furthermore, because a sensor 17 consisting of a laser sensor and a weight measuring device 20 such as a load cell were required to identify the timing of the start and end of the flow of the viscous fluid, the device structure was complex, resulting in high manufacturing costs. Furthermore, in the device disclosed in Patent Document 3, the flowing concrete is detected by a detector consisting of an optical sensor, so the concrete flow time can be measured accurately, but there is a problem that the manufacturing cost is high because two types of slump cones 4 corresponding to the JA funnel and JP funnel shown in Figures 8(a) and 8(b) must be prepared. Also, there is a problem that it is difficult to identify the point when the concrete flow suddenly narrows, so it is not possible to perform tests using a JP funnel.

[0010] The present invention has been made to address the above-mentioned problems, and aims to provide a grout fluidity testing device that can be used with JA funnels and JP funnels, and that can accurately identify the timing when grout starts and stops flowing, thereby enabling the flow time of grout to be measured efficiently and with high precision. [Means for solving the problem]

[0011] In order to achieve the above-mentioned object, the first invention is a grout fluidity testing device used to measure the flow time required for grout contained in a funnel to completely flow out of an outlet, characterized in that it comprises a funnel holding part that holds the funnel with the outlet protruding from the lower end, a support member that supports the funnel holding part, a shielding plate that can block the outlet, a measuring instrument that slides the shielding plate horizontally to switch the outlet from a blocked state to an open state, a height adjustment member that can adjust the height of the measuring instrument, a detection means that detects grout flowing down from the outlet, and a timing means that measures the flow time based on the grout detection results by the detection means.

[0012] In the first invention, when the height adjustment member is operated, the height of the measuring instrument changes, thereby changing the height of the shielding plate. Also, in the first invention, since the grout flowing down from the outlet of the funnel is detected by the detection means, the start and end times of the grout flow can be determined more accurately than when determined visually.

[0013] The second invention is characterized in that, in the first invention, the detection means is a laser sensor equipped with a projector that emits laser light and a receiver that receives the laser light, and the projector and receiver are arranged opposite each other below the shielding plate so that the laser light crosses the grout flowing down from the outlet. Laser sensors have higher detection accuracy than photoelectric sensors and ultrasonic sensors that use visible light other than laser light. Therefore, the second invention further enhances the effect of the first invention, which is to accurately identify the start and end points of grout flow.

[0014] A third invention is characterized in that in the second invention, the laser light emitted by the projector has a band shape that is wider than the inner diameter of the outflow port. In the third invention, the width of the grout flowing down from the outlet in a horizontal direction perpendicular to the optical path of the laser light is wider than the width of the grout flowing down from the outlet, so the laser light is irradiated over the entire width of the grout flowing down from the outlet. Therefore, in addition to the effect of the second invention, the third invention has the effect that even if the width of the grout flowing down from the outlet changes suddenly, the phenomenon can be reliably detected by the detection means.

[0015] The fourth invention is characterized in that, in any one of the first to third inventions, the funnel holder is shaped like a truncated cone, with the inner diameter at its upper end equal to the outer diameter at the upper end of the JA funnel and the inner diameter at its lower end greater than the outer diameter of the outlet of the JP funnel but smaller than the outer diameter at the upper end of the JP funnel. Note that in the fourth invention, the "funnel holder shaped like a truncated cone" also includes a "funnel holder shaped like an approximately truncated cone" whose side surfaces change in slope midway. In the fourth invention, in addition to the effects of any one of the first to third inventions, when a JA funnel is placed in the funnel holding portion, a portion of the side of the JA funnel is held by the funnel holding portion with the outlet protruding from the lower end of the funnel holding portion, and when a JP funnel is placed in the funnel holding portion, a portion of the side of the JP funnel is held by the edge of the lower end of the funnel holding portion with the outlet protruding from the lower end of the funnel holding portion.

[0016] The fifth invention is characterized in that, in any of the first to third inventions, the funnel holding portion is formed to be able to hold a JA funnel and a JP funnel, respectively, and is provided with a first funnel holding portion and a second funnel holding portion that are each detachably installed on the support member. In the fifth invention, in addition to the effect of any one of the first to third inventions, by exchanging the first funnel holding part and the second funnel holding part, either a JA funnel or a JP funnel can be installed on the support member.

[0017] The sixth invention is characterized in that, in the second or third invention, the measuring instrument comprises a circular through hole formed parallel to the vertical direction so that the outlet can be inserted from above, a hole for a shielding plate formed horizontally across this through hole, and a pair of bottomed holes that open into the through hole below the hole for the shielding plate, are symmetrical about the through hole, and are elongated and parallel to the depth direction of the hole for the shielding plate, and a shielding plate is slidably installed in the hole for the shielding plate, and a light emitter and a light receiver are installed in the pair of bottomed holes so that they face each other across the through hole. The sixth invention has the effect of realizing the measuring device of the first invention with a simple structure in addition to the effect of the second or third invention.

[0018] The seventh invention is characterized in that, in the sixth invention, the through hole has a stepped structure consisting of a small diameter portion into which the outlet of the funnel is inserted and a large diameter portion continuing from this small diameter portion, and the hole for the shielding plate is arranged so as to cross the small diameter portion. In the seventh invention, in addition to the effect of the sixth invention, since the large diameter portion is thicker than the small diameter portion, the grout flowing down the large diameter portion is less likely to come into contact with the inner wall surface thereof. [Effects of the Invention]

[0019] In the first invention, when a JA funnel and a JP funnel of different heights are installed in the funnel holder, the lengths of their protrusions from the bottom end of the funnel holder are different, and therefore the heights of their outlets are also different. However, in the first invention, both the JA funnel and the JP funnel can be installed in the funnel holder by operating the height adjustment member to adjust the height of the shielding plate so that it can shield the outlet. In this case, unlike the prior art, there is no need to prepare two types of tripods, etc., corresponding to the JA funnel and the JP funnel, respectively. Therefore, according to the first invention, grout fluidity testing can be performed efficiently.

[0020] According to the second invention, the effect of the first invention, that is, the time when the grout starts to flow from the outlet of the funnel and the time when the grout stops flowing, can be more effectively demonstrated, and therefore the grout flow time can be measured with even higher accuracy than in the case of the first invention.

[0021] According to the third invention, even if the horizontal width of the grout flowing down from the outlet changes suddenly, the phenomenon can be reliably detected by the detection means, and therefore, in addition to the effect of the second invention, it is possible to perform a test using a JP funnel, in which the end of the grout flow is determined to be the point at which the horizontal width suddenly narrows, with high accuracy. Furthermore, unlike the invention disclosed in Patent Document 2, the third invention has the advantage of low manufacturing costs because it does not require a weight measuring device even when performing a test using a JP funnel.

[0022] According to the fourth invention, the funnel holding portion in the first invention is realized with a simple structure, and in addition to the effects of any one of the first to third inventions, the fourth invention has the effect of reducing manufacturing costs.

[0023] In the fifth invention, in addition to the effects of any one of the first to third inventions, the funnel holding portion in the first invention is realized with a simple structure, thereby achieving the same effect as the fourth invention, namely, reduced manufacturing costs.

[0024] In the sixth invention, in addition to the effects of the second or third invention, the measuring instrument of the first invention is realized with a simple structure, and therefore the same effect as the fourth invention, namely, reduced manufacturing costs, is achieved.

[0025] According to the seventh invention, it is unlikely that the grout flowing down the through hole will come into contact with the inner wall surface of the large diameter section, causing its flow rate to decrease. Therefore, in addition to the effect of the sixth invention, the effect of the second invention, that is, the grout flow time can be measured with high accuracy, is further enhanced. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a perspective view showing the appearance of an example of a grout fluidity test device according to an embodiment of the present invention. FIG. [Figure 2] 1(a) is a perspective view showing the appearance of the measuring instrument and the support tool, and FIG. 1(b) is a cross-sectional view taken along line AA in FIG. 1(a). [Figure 3] FIG. 2 is a block diagram of a detection unit and a timing unit. [Figure 4] 1(a) and 1(b) are perspective views showing the appearance of a support member and a funnel holding part that constitute the device main body, respectively. [Figure 5] 4(a) is a side view showing the state in which the outlines of the JA funnel and the JP funnel are superimposed with the central axes and upper ends aligned, and FIG. 4(b) is a cross-sectional view taken along line BB in FIG. 4(b). [Figure 6] FIG. 2 is a cross-sectional view taken along the line CC in FIG. [Figure 7] FIG. 2 is a cross-sectional view taken along the line CC in FIG. [Figure 8] (a) and (b) are external views showing the shape and dimensions of the JA funnel and JP funnel used in the fluidity test of PC grout, respectively. DETAILED DESCRIPTION OF THE INVENTION

[0027] The grout fluidity testing device according to the embodiment of the present invention and its operation and effects will be specifically described with reference to FIGS. 1 to 7. FIG. In the following explanation, expressions such as upper surface, lower surface, upper end, lower end, or above and below are used, assuming the state in which the grout fluidity test device is actually used. [Example]

[0028] Figure 1 is a perspective view showing the appearance of a grout fluidity testing device 1 according to an embodiment of the present invention. Figure 2(a) is a perspective view showing the appearance of a measuring instrument 5 and a support 6, and Figure 2(b) is a cross-sectional view taken along line AA in Figure 2(a). Figure 3 is a block diagram of a detection means 16 and a timing means 17, and Figures 4(a) and 4(b) are perspective views showing the appearance of a support member 3 and a funnel holder 4, respectively, which constitute the device main body 2. 1 and 2 omit illustration of the male screw provided on the outer peripheral surface of the shaft portion 15a of the height adjustment member 15. Also, in Fig. 2(b), illustration of the display unit 8 and the input unit 9 is omitted. As shown in Figure 1, the grout fluidity test device 1 is composed of a support member 3 and a funnel holder 4, and is equipped with an apparatus main body 2 that vertically holds the JA funnel 50 and JP funnel 51 already explained with reference to Figure 8, a measuring device 5 that measures the flow time of grout flowing down from outlets 50a and 51a, a support 6 that supports this measuring device 5, a container 7 installed below this support 6, and detection means and timing means built into the measuring device 5.

[0029] As shown in Figures 2(a) and 2(b), the measuring instrument 5 is rectangular parallelepiped-shaped, with a display unit 8 and an input unit 9 provided on the front surface 5a, and a circular stepped through-hole 10 consisting of a small diameter portion 10a provided perpendicular to the top surface 5b and a large diameter portion 10b continuing from this small diameter portion 10a, which is provided in the vertical direction so as to reach the bottom surface 5c. Further, a shielding plate hole 12a consisting of a bottomed hole is provided on the back surface 5d of the measuring instrument 5 so as to perpendicularly cross the small diameter portion 10a of the through hole 10, and below the shielding plate hole 12a, a pair of bottomed holes 12b, 12b which have a width (width in a direction perpendicular to both the depth direction of the shielding plate hole 12a and the depth direction of the through hole 10) larger than the inner diameter of the small diameter portion 10b of the through hole 10 and which open into the large diameter portion 10b are formed symmetrically across the through hole 10 and elongated parallel to the depth direction of the shielding plate hole 12a. Further, a shielding plate 11 which is rectangular in plan view is installed in the shielding plate hole 12a so as to be slidable in the direction indicated by arrow X, and a light emitter 16a and a light receiver 16b of a detection means 16, which will be described later using FIG. 3, are installed inside the pair of bottomed holes 12b, 12b so as to face each other with the through hole 10 therebetween.

[0030] The support 6 comprises a top plate 14a on which the measuring instrument 5 is placed, legs 14 consisting of a pair of side plates 14b, 14b extending vertically in the same direction from both ends of the top plate 14a, and four height adjustment members 15 which are screwed into a pair of screw holes (not shown) provided in the pair of side plates 14b so as to be perpendicular to the top plate 14a. In addition, the top plate 14a is provided with a through-hole 13 having an inner diameter equal to that of the large-diameter portion 10b at a location that coincides with the through-hole 10 when the measuring instrument 5 and the support 6 are viewed from a direction perpendicular to the top surface 5b. The height adjustment member 15 is composed of a shaft portion 15a having a male thread formed on the outer peripheral surface of a cylinder that screws into the female thread of the screw hole, and a grounding portion 15b that is disk-shaped and has a diameter larger than the outer diameter of the shaft portion 15a and is attached to one end of the shaft portion 15a.

[0031] As described above, the grout fluidity test apparatus 1 has a simple structure for the measuring device 5, resulting in low manufacturing costs. Furthermore, in the grout fluidity test apparatus 1, the through-hole 10 has a stepped structure consisting of a small-diameter portion 10a and a large-diameter portion 10b connected to the small-diameter portion 10a. When the shielding plate 11 is slid, the outlets 50a and 51a switch from a closed state to an open state, causing the grout to flow down the large-diameter portion 10b. This reduces the likelihood of the grout coming into contact with the inner wall surface of the large-diameter portion 10b, resulting in a decrease in its flow rate. This improves the accuracy of measuring the grout flow time.

[0032] 3, the detection means 16 includes a projector 16a that emits a band-shaped laser beam whose width is wider than at least the inner diameter of the outlets 50a and 51a, a photoreceiver 16b that receives the laser beam projected by the projector 16a, a processing unit 16c that outputs a light-receiving signal D3 corresponding to the intensity of the laser beam received by the photoreceiver 16b, and a control unit 16d that controls the operation of the display unit 8 and the projector 16a in accordance with the operation of the input unit 9. The timing means 17 includes a stopwatch 17a whose operation is controlled by the control unit 16d of the detection means 16, and a memory 17b that stores the results of measurements by the stopwatch 17a. Both the detection means 16 and the timing means 17 are operated by power supplied from a power source (not shown).

[0033] In the grout fluidity testing device 1 having this structure, when a test start switch on the input unit 9 is pressed, a test start signal D1 is sent from the input unit 9 to the control unit 16d. Upon receiving the test start signal D1, the control unit 16d sends a light-projection start signal D2 to the light-projector 16a, which then projects a laser beam onto the light-receiver 16b in accordance with the light-projection start signal D2. The processing unit 16c then sends a light-receiving signal D3 to the control unit 16d, the magnitude of which varies depending on the intensity of the laser beam received by the light-receiver 16b. When the light-receiving signal D3 sent from the processing unit 16c decreases, the control unit 16d determines that at least a portion of the laser beam projected from the light-projector 16a toward the light-receiver 16b has been blocked by the grout flowing down the inside of the through-hole 10 of the measuring device 5, and sends a measurement start signal D4 to the stopwatch 17a of the timing means 17. Upon receiving this measurement start signal D4, the stopwatch 17a starts measurement and sends the start time T1 to the control unit 16d. Upon receiving the start time T1 from the stopwatch 17a, the control unit 16d stores this start time T1 in the memory 17b.

[0034] When the light receiving signal D3 sent from the processing unit 16c becomes stronger, the control unit 16d determines that the grout that was blocking at least a portion of the laser light projected from the light projector 16a toward the light receiver 16b has flowed out or that the flow of grout has suddenly weakened, and sends a measurement stop signal D5 to the stopwatch 17a of the timing means 17. Upon receiving this measurement stop signal D5, the stopwatch 17a stops measurement and sends the end time T2 to the control unit 16d. Upon receiving the end time T2 from the stopwatch 17a, the control unit 16d reads the start time T1 from the memory 17b and calculates the flow time T3 (= end time T2 - start time T1) from the start time T1 and end time T2. The control unit 16d stores the flow time T3 and end time T2 in the memory 17b and displays the start time T1, end time T2, and flow time T3 on the display unit 8. When the test end switch of the input unit 9 is pressed, a test end signal D6 is sent from the input unit 9 to the control unit 16d. Then, upon receiving the test end signal D6, the control unit 16d sends a light-projection stop signal D7 to the light-projector 16a, and the light-projector 16a stops emitting laser light to the light-receiver 16b in accordance with the light-projection stop signal D7.

[0035] As described above, the grout fluidity test apparatus 1 uses a laser sensor for the detection means 16, which has higher object detection accuracy than photoelectric sensors or ultrasonic sensors that use visible light other than laser light. Therefore, the start and end times of grout flow can be determined more accurately than when determined visually. This improves the accuracy of measuring the grout flow time. Furthermore, in the grout fluidity test apparatus 1, the width of the laser light emitted by the detection means 16 is wider than the width of the grout flowing from the outlet 50a of the JA funnel 50 or the outlet 51a of the JP funnel 51 (the horizontal width perpendicular to the optical path of the laser light). Therefore, the laser light is irradiated across the entire width of the grout flowing from the outlets 50a and 51a. Therefore, even if the width of the grout flowing from the outlets 50a and 51a suddenly changes, the phenomenon can be reliably detected by the detection means 16. Therefore, the grout fluidity test device 1 can perform a test with high accuracy using the JP funnel 51, which determines the end of the flow of grout when the horizontal width suddenly narrows.

[0036] As shown in Figure 4(a), the support member 3 of the device main body 2 is rectangular and includes a top plate 18a with an insertion hole 3a for the funnel holding portion 4 in the center, a bottom plate 18b parallel to the top plate 18a, a pair of side plates 18c, 18c that connect the ends of the top plate 18a and the bottom plate 18b perpendicular to both of them, and a front plate 18d and a back plate 18e (see Figure 6) that connect the upper parts of the pair of side plates 18c, 18c to the top plate 18a. As shown in FIG. 4(b), the funnel holder 4 is made of a cylindrical body that is roughly frustoconical in side view, and has a flange 4a at its upper end 4d (see FIG. 5(b)).

[0037] Figure 5(a) is a side view of the JA funnel 50 and JP funnel 51 shown in Figures 8(a) and 8(b), with the central axes 50d, 51d and upper ends 50c, 51c aligned, with the contour lines representing their outer shapes superimposed on each other. Figure 5(b) is a cross-sectional view taken along line BB in Figure 4(b). Figures 6 and 7 are cross-sectional views taken along line CC in Figure 1. Figures 6 and 7 show the JA funnel 50 and JP funnel 51 installed in the funnel holder 4, respectively. As shown in Figure 5(a), above point P where the outer diameters of the JA funnel 50 and the JP funnel 51 are equal, the outer diameter of the outer contour 50b is larger than that of the outer contour 51b, and below point P, the outer diameter of the outer contour 50b is smaller than that of the outer contour 51b. Therefore, as shown in Figure 5(b), the contour line of the inner wall surface 4b of the funnel holder 4 is formed so that it coincides with the outer contour line 50b above point Q, which corresponds to point P in Figure 5(a), and coincides with the outer contour line 51b below point Q. However, in the funnel holder 4, the length from the flange 4a to the lower end 4c is shorter than the height of the JA funnel 50, which is shown as 381.1 mm in Figure 8(a), so that the outlet 51a protrudes from the lower end 4c when the JA funnel 50 is installed.

[0038] When a JA funnel 50 is installed in the funnel holder 4 having the above structure, the JA funnel 50 is held by the funnel holder 4 at the inner wall surface 4b between point Q (see FIG. 5(b)) and the upper end 4d, as shown in Fig. 6. When a JP funnel 51 is installed in the funnel holder 4, the JP funnel 51 is held by the funnel holder 4 at the inner wall surface 4b between point Q (see FIG. 5(b)) and the lower end 4c, as shown in Fig. 7, and the outlet 51a inserted into the small diameter portion 10a of the through-hole 10 is held by the measuring instrument 5. When installed in the funnel holding portion 4, the heights of the outlets 50a, 51a of the JA funnel 50 and the JP funnel 51 are different, but by changing the height of the measuring device 5 by rotating the shaft portion 15a of the height adjustment member 15, the shielding plate 11 installed in the shielding plate hole 12a of the measuring device 5 can shield the outlet 50a of the JA funnel 50 and the outlet 51a of the JP funnel 51, as shown in Figures 6 and 7.

[0039] In the grout fluidity test device 1, when the shaft 15a of the height adjustment member 15 is rotated to change the length of the protrusion from the screw hole of the leg 14, the height of the measuring device 5 placed on the upper surface of the top plate 14a of the leg 14 changes, and therefore the height of the shield plate 11 held by the shield plate hole 12a of the measuring device 5 also changes. Note that when the JA funnel 50 and the JP funnel 51, which are different heights, are installed in the funnel holder 44, the lengths of the protrusion from the lower end 4c of the funnel holder are different, and therefore the heights of the outlets 50a, 51a are different. However, in the grout fluidity test apparatus 1, the height of the shielding plate 11 can be adjusted by operating the height adjustment member 15 so that the shielding plate 11 can shield the outlets 50a, 51a. This makes it possible to install both the JA funnel 50 and the JP funnel 51 in the funnel holder 4. In this case, unlike the invention disclosed in Patent Document 2, there is no need to prepare two types of tripods or the like corresponding to the JA funnel 50 and the JP funnel 51, respectively. Therefore, the grout fluidity test apparatus 1 allows for efficient performance of grout fluidity tests.

[0040] The grout fluidity test device of the present invention is not limited to the above-described structure. For example, the funnel holder 4 may have a structure in which the inner diameter of the upper end 4d is equal to the outer diameter of the upper end 50c of the JA funnel 50, and the inner diameter of the lower end 4c is larger than the outer diameter of the outlet 51a of the JP funnel 51 but smaller than the outer diameter of the upper end 51c of the JP funnel 51. When a JA funnel 50 is installed in a funnel holder 4 having such a structure, part of the side of the JA funnel 50 is held by the funnel holder 4 with outlet 50a protruding from the lower end 4c of the funnel holder 4, and when a JP funnel 51 is installed in the funnel holder 4, part of the side of the JP funnel 51 is held by the edge of the lower end 4c of the funnel holder 4 with outlet 51a protruding from the lower end 4c of the funnel holder 4, and outlet 51a inserted into the small diameter portion 10a of the through-hole 10 is held by the measuring device 5. With such a structure, the manufacturing cost of the funnel holder 4 can be reduced.

[0041] The funnel holder 4 may also be a first funnel holder and a second funnel holder that are capable of holding the JA funnel 50 and the JP funnel 51, respectively, and are detachably attached to the support member 3. In this case, by exchanging the first funnel holder and the second funnel holder, it is possible to perform tests using either the JA funnel 50 or the JP funnel 51. This structure reduces the manufacturing costs of the funnel holder 4. [Industrial Applicability]

[0042] The grout fluidity testing device of the present invention can be used to measure the flow time of grout, which is used to evaluate the fluidity of grout injected into cavities, gaps, or cracks that occur during construction or civil engineering work. [Explanation of symbols]

[0043] DESCRIPTION OF SYMBOLS 1...Grout fluidity test apparatus 2...Apparatus body 3...Support member 3a...Insertion hole 4...Funnel holder 4a...Flange 4b...Inner wall surface 4c...Lower end 4d...Upper end 5...Measuring instrument 5a...Front surface 5b...Upper surface 5c...Lower surface 5d...Rear surface 6...Support tool 7...Container 8...Display unit 9...Input unit 10...Through hole 10a...Small diameter portion 10b...Large diameter portion 11...Shield plate 12a...Shield plate hole 12b...Bottom hole 13...Through hole 14...Legs 14a...Top plate 14b...Side plate 15...Height adjustment member 15a...Axis portion 15b...Ground portion 16...Detection means 16a...Projector 16b...Receiver 16c...Processing unit 16d...Control unit 17...Time measuring means 17a...Stopwatch 17b...Memory 18a...Top plate 18b...Bottom plate 18c...Side plate 18d...Front plate 18e...Back plate 50...JA funnel 50a...Outlet 50b...Outline contour 50c...Top end 50d...Central axis 51...JP funnel 51a...Outlet 51b...Outline contour 51c...Top end 51d...Central axis D1...Test start signal D2...Light emission start signal D3...Light reception signal D4...Measurement start signal D5...Measurement stop signal D6...Test end signal D7...Light emission stop signal T1...Start time T2...End time T3...Flow time

Claims

1. A grout fluidity test device used to measure the flow time required for grout contained in a funnel to completely flow out of an outlet, a funnel holder that holds the funnel with the outlet protruding from a lower end thereof; a support member that supports the funnel holder; a shielding plate capable of shielding the outlet; a measuring instrument that switches the outlet from a blocked state to an open state by sliding the blocking plate in a horizontal direction; a height adjustment member that can adjust the height of the measuring instrument; A detection means for detecting the grout flowing down from the outlet; and a timing means for measuring the flow time based on the detection result of the grout by the detection means.

2. the detection means is a laser sensor including a projector that emits a laser beam and a photoreceiver that receives the laser beam, 2. The grout fluidity testing device according to claim 1, wherein the light projector and the light receiver are arranged opposite each other below the shielding plate so that the laser light crosses the grout flowing down from the outlet.

3. 3. The grout fluidity testing device according to claim 2, wherein the laser light emitted by the light projector is in the form of a band whose width is wider than the inner diameter of the outlet.

4. 4. A grout fluidity test device according to claim 1, wherein the funnel holder has a truncated conical cylindrical shape, the inner diameter of the upper end being equal to the outer diameter of the upper end of the JA funnel, and the inner diameter of the lower end being larger than the outer diameter of the outlet of the JP funnel and smaller than the outer diameter of the upper end of the JP funnel.

5. A grout fluidity testing device as described in any one of claims 1 to 3, characterized in that the funnel holding portion is formed to be able to hold a JA funnel and a JP funnel, respectively, and is provided with a first funnel holding portion and a second funnel holding portion that are respectively detachably installed on the support member.

6. The measuring instrument is a circular through-hole formed parallel to the vertical direction so that the outlet can be inserted from above; a hole for a shielding plate formed so as to horizontally cross the through hole; a pair of bottomed holes that are open to the through hole below the shielding plate hole, are symmetrical with respect to the through hole, and are elongated and parallel to the depth direction of the shielding plate hole, The shielding plate is slidably installed in the shielding plate hole, 4. A grout fluidity testing device according to claim 2 or claim 3, wherein the light projector and the light receiver are respectively installed in the pair of bottomed holes so as to face each other across the through hole.

7. the through hole has a stepped structure including a small diameter portion into which the outlet of the funnel is inserted and a large diameter portion continuing from the small diameter portion, 7. The grout fluidity test device according to claim 6, wherein the hole for the shielding plate is provided so as to traverse the small diameter portion.

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