JP6644426B2 - Filling material filling evaluation device - Google Patents

Description

  The present invention relates to an apparatus for evaluating filling of an injection material with respect to cracks in concrete or the like.

  With the aging of social capital in recent years, for example, a collapse accident due to deterioration of a tunnel structure has become a social problem. Repair of such a deteriorated structure is performed, for example, by injecting an injection material into a crack. In the repair method called the crack injection method, it is necessary that the crack is sufficiently filled with the injection material. Therefore, conventionally, a concrete specimen having a crack formed therein was used as a specimen, and whether or not the specimen was filled with the filler was confirmed by leakage of the filler from the side opposite to the injection side. Therefore, the state of filling in the crack cannot be directly visually confirmed, and it has been difficult to repeatedly use the same specimen. Furthermore, it is difficult to accurately grasp the filling property of the injectable material under various water pressure conditions and concrete thickness different conditions.

  In order to solve the above problem, for example, in Non-patent Document 1, a portion having a diameter of 5 cm is drilled at a location where a filler is injected into a crack to collect a core having a depth of 10 cm or more, and a vertical filling length with respect to the core length A technique of calculating the ratio of the filling as the filling rate is used.

Isao Naito and one other, "Basic Study on Quality Control after Crack Injection in Actual Structure", Japan Society of Civil Engineers 67th Annual Scientific Lecture (September 2012), p.85-86 (2012) Japan Concrete Institute, “Concrete Cracking Survey, Repair and Reinforcement Guidelines -2013”, p.85

  However, in the method according to Non-Patent Document 1, it is necessary to collect cores from the repaired structure, and in order to find injection conditions suitable for the width of cracks and such water pressure, a huge number of cores are collected. Needed.

  Therefore, an object of the present invention made in view of such a point is to provide an injection material filling evaluation device capable of efficiently finding the injection condition of the injection material.

In order to solve the above problems, the filling material filling evaluation device according to the present invention,
A filling section having a filling space for the injection material,
An injection material supply unit for supplying the injection material to the filling unit,
An injection material pressure adjusting unit that adjusts an injection pressure for injecting the injection material into the filling unit,
The filling unit includes:
A substrate that have a grout injection hole for injecting the injection material communicating with said injection material supply unit,
A middle plate having a recess or opening fixed to the substrate and forming the filling space ,
A lid plate fixed to the middle plate and at least partly made of a transparent member ;
With
The filling space is characterized in that the dimension in at least one direction perpendicular to the injection direction of the injection material can be changed.

  ADVANTAGE OF THE INVENTION According to this invention, the injection | pouring material filling evaluation apparatus which can find out the injection | pouring condition of injection | pouring material efficiently can be provided.

It is a front view showing the composition of the filling material filling evaluation device concerning one embodiment of the present invention. It is an exploded perspective view showing the composition of some filling parts used for the filling material filling evaluation device concerning one embodiment of the present invention. It is sectional drawing which shows the structure of the filling part of FIG. 2, (a) is plane sectional drawing, (b) is front sectional drawing. FIG. 4 is a cross-sectional view illustrating a configuration of the filling unit in FIG. 3 as viewed from an injection material injection side. (A)-(c) is a figure which shows the variation of the opening shape of the middle plate used for the filling part shown in FIG. It is a figure which shows the connection structure of the filling part, the injection | pouring material supply part, the water supply part, the injection | pouring material pressure adjustment part, and the water pressure adjustment part used for the injection | pouring material filling evaluation apparatus which concerns on one Embodiment of this invention. It is a flowchart which shows the use procedure of the injection | pouring material filling evaluation apparatus which concerns on one Embodiment of this invention. It is a figure which shows the calculation result which shows the relationship between the pressure difference of an injection | pouring material and water, and a filling time, and an experimental result.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of an injection material filling evaluation apparatus 100 according to one embodiment of the present invention. The filling material filling evaluation apparatus 100 of the present embodiment includes a filling unit 10 having a filling space F for filling material, a filling material supply unit 20 for supplying the filling material to the filling unit 10, and a filling material 10 for filling the filling unit 10. It has an injection material pressure adjustment unit 30 for adjusting the injection pressure, a water supply unit 40 for supplying water to the filling unit 10, and a water pressure adjustment unit 50 for adjusting the supply pressure of water to the filling unit 10.

  The filling unit 10 has a filling space F for the filling material, and is connected to the filling material supply unit 20 via the filling material supply valve 26 and the filling material supply tube 24, while the water supply valve 46 and the water supply tube It is connected to the water supply unit 40 via 44. In addition, the filling unit 10 includes an injection material pressure sensor 27 for measuring the internal pressure on the injection material supply side in the filling space F, and a water pressure sensor 47 for measuring the internal pressure on the water supply side.

  The filling portion 10 has a configuration simulating cracks caused by deterioration of the structure. FIG. 2 is an exploded perspective view showing a configuration of the transparent member 16 b of the substrate 12, the intermediate plate 14, and the cover plate 16 that constitute the filling unit 10. The substrate 12 communicates with an injection material injection hole 26b for guiding the injection material into the filling unit 10 via the injection material supply valve 26 and a water injection hole 46b for guiding water into the filling unit 10 via the water supply valve 46, respectively. It has two grooves 12a. The groove 12a extends in the depth direction of FIG. 2 and is open upward. The groove 12a is configured to partially overlap the left and right ends of the opening 14a provided in the middle plate 14, as viewed from above in FIG. Therefore, when the middle plate 14 and the transparent member 16b are overlaid on the substrate 12 of FIG. 2 from above, the upper surface of the opening 14a of the middle plate 14 is closed by the transparent member 16b, while the lower surface of the opening 14a is formed by the groove 12a. The filling space F is formed by being closed by the substrate 12 except for the portion overlapping with the opening 14a. The filling space F communicates with the groove 12a at both left and right ends in FIG. As a result, the filling space F of the filling unit 10 has the same height as the thickness ω of the middle plate 14. Therefore, three types of middle plates 14 having different thicknesses ω (for example, ω = 0.1 mm, 0.3 mm, and 1.0 mm) are prepared, and the height of the filling space F is changed by replacing the middle plates 14. To evaluate the filling of the injection material. In addition, the board | substrate 12, the intermediate | middle board 14, and the transparent member 16b shown in FIG.

  FIG. 3 shows (a) a plan view and (b) a front view of the filling unit 10. An injection material supply valve 26, an injection material pressure sensor 27, and a discharge valve 28 are attached to the side surface of the substrate 12 on the injection material injection side (the right side in FIGS. 3A and 3B). Communicating. On the other hand, a water supply valve 46 and a water pressure sensor 47 are attached to the side surface of the substrate 12 on the water supply side (the left side in FIGS. 3A and 3B), and communicates with the groove 12a on the left side. When water is supplied from the water supply unit 40 of FIG. 1 into the filling space F via the water supply valve 46, the air in the filling space F is discharged from the discharge valve 28 to the outside while the water in the filling space F is discharged. Can be filled. At this time, the water pressure in the filling space F can be detected by the water pressure sensor 47. When the filling material is supplied into the filling space F through the filling material supply valve 26 in a state where the filling space F is filled with water, the water in the filling space F is discharged from the discharge valve 28 to the outside. , And the filling space F can be filled with the filling material. At this time, the injection material pressure in the filling space F can be detected by the injection material pressure sensor 27. The filling material can be filled in the filling space F while the filling space F is filled with air.

  As shown in FIG. 3B, the filling unit 10 is stacked on the substrate 12 in the order of the intermediate plate 14, the transparent member 16b, and the pressing member 16a, and these are screw-fixed together by tightening. The pressing member 16a has three large cover plate openings 16a1 as shown in FIG. 3A, and the transparent member 16b and the filling space F can be visually recognized through these cover plate openings 16a1. Note that, for example, an acrylic resin can be used for the transparent member 16b, but the present invention is not limited to this, and other transparent materials such as glass and polycarbonate resin can be used. Further, even if the transmittance of the transparent member 16b such as colored glass is low, it is only necessary that the filling space F can be visually recognized from the outside as to which of the air, water, and the filling material is filled. In this embodiment, aluminum is used for the material of the substrate 12 and the pressing member 16a, and stainless steel is used for the material of the intermediate plate 14. However, the present invention is not limited to these aspects, and other various metals and resins may be used. Materials and the like can be used. However, since the middle plate 14 is a thin member compared to the substrate 12 and the pressing member 16a, it is desirable to use a material having high bending rigidity.

  FIG. 4 is a side sectional view of the filling unit 10 of FIG. 3 as viewed from the injection material supply side. Sealing rubbers 18 are arranged on the surfaces of the substrate 12 and the transparent member 16b facing the middle plate 14, respectively. The sealing rubber 18 is configured to prevent the water and the filling material filled in the filling space F from leaking.

  5 (a) to 5 (c) are diagrams showing variations of the shape of the opening 14a of the middle plate 14, in which the injection material is injected from the left side of the figure and water is injected from the right side. It is configured. FIG. 5A simulates a state in which the crack length (the vertical direction in FIG. 5A) extends to the water supply side while being constant. FIG. 5 (b) simulates a state where the crack length is constant, but the crack is closed on the way and separated from the water supply side. In the model of FIG. 5B, the filling of the injection material is not affected by the water pressure. FIG. 5C simulates a state in which the crack length on the injection material supply side is short, and the injection material pressure and the injection material for properly filling the injection material with both the width and the length of the crack small. The viscosity and the like can be confirmed.

  FIG. 6 is a diagram showing the connection configuration of the filling unit 10, the injection material supply unit 20, the injection material pressure adjustment unit 30, the water supply unit 40, and the water pressure adjustment unit 50 in FIG. 1 in more detail. The injection material supply unit 20 guides the injection material accumulated in the injection material cylinder 22 to the filling unit 10 via the injection material supply tube 24 and the injection material supply valve 26. Further, the water supply unit 40 guides the water accumulated in the water supply cylinder 42 to the filling unit 10 via the water supply tube 44 and the water supply valve 46. An injection material pressure regulator 34 is connected to the injection material cylinder 22, and the compressed air from the injection material compressor 36 is adjusted and supplied to the injection material cylinder 22. The injection material is pressurized by the adjusted compressed air and supplied to the filling unit 10. Further, since the injection material pressure regulator 34 adjusts the pressure of the compressed air based on the rotation angle of the injection material pressure adjustment handle 34a shown in FIG. 1, the user rotates the injection material pressure adjustment handle 34a to fill the filling section. The pressure of the injection material supplied to 10 can be adjusted. The pressure at which the injection material is sent to the filling section 10 can be confirmed by the injection material pressure gauge 32 (see FIGS. 1 and 6). Similarly, a water supply pressure regulator 54 is connected to the water supply cylinder 42, and regulates the pressure of compressed air from a water supply compressor 56 and supplies the compressed air to the water supply cylinder 42. The water is pressurized by the regulated compressed air and supplied to the filling unit 10. Further, since the water supply pressure regulator 54 regulates the pressure of the compressed air based on the rotation angle of the water pressure adjustment handle 54a shown in FIG. 1, the user rotates the water pressure adjustment handle 54a to fill the filling section 10. The pressure of the water supplied to the can be adjusted. In addition, the pressure at which water is sent to the filling unit 10 can be confirmed by a water pressure gauge 52 (see FIGS. 1 and 6).

  FIG. 7 is a flowchart showing a procedure for using the injection material filling evaluation apparatus 100 according to the present embodiment when evaluating the filling state of the injection material using the apparatus 100. First, the user fills the water supply cylinder 42 (see FIG. 1) that supplies water to the filling unit 10 with water (step S101), and operates the water pressure adjustment handle 54a to increase the water pressure. Water is supplied to 10 (step S103). Since air is contained in the filling space F of the filling unit 10, the user opens the cock of the discharge valve 28 and exhausts the air in the filling space F to the outside (step S105). At this time, it is preferable to change the attitude of the filling unit 10 so that the discharge valve 28 is located above the filling space F. After confirming that the air in the filling space F has been discharged and the water has been filled in step S105 (step S107), the user operates the water pressure adjustment handle 54a to operate the pressure of the water to be sent to the filling unit 10. Is set to a predetermined value (step S109), and the water supply valve 46 is closed (step S111). By the above operation, the filling section 10 is filled with water having a predetermined water pressure, and this simulates a state in which water has entered the cracks of the structure.

  Next, a procedure for filling the injection material will be described. The user first fills the injection material cylinder 22 with the injection material (step S113). As the material of the injecting material, for example, a cement-based injecting material, an epoxy resin-based injecting material, an acrylic resin-based injecting material, or the like can be used, but is not limited to these materials. The user operates the injection material pressure adjusting handle 34a (see FIG. 1) to increase the injection material pressure (step S115), and transfers the injection material through the injection material supply tube 24 to just before the injection material supply valve 26. Filling is performed (step S117). Here, the user operates the injection material pressure adjustment handle 34a to adjust the injection material pressure gauge 32 to a predetermined set value (step S119). Then, the cock 26a is operated to open the injection material supply valve 26, and the injection material is supplied to the filling unit 10 (Step S121). Since the filling space F of the filling unit 10 is filled with water, the user opens the discharge valve 28 to discharge the water in the filling space F (Step S123). At this time, it is preferable to change the attitude of the filling unit 10 so that the discharge valve 28 is located below the filling space F. When the user confirms that the water in the filling space F has been replaced by the filling material (step S125), the user measures the time required from the start of filling of the filling material to the completion of the replacement with the filling material. (Step S127). The determination that water has been replaced by the injection material is made based on whether or not the injection material has been filled in the filling space F by a predetermined ratio in the injection direction of the injection material. For example, in FIG. 2, when the length of the filling material F in the filling material injection direction (the left-right direction in FIG. 2) is 36 cm, it is determined that the filling is completed when the filling material is filled by 30 cm in the filling material direction. it can. The criterion for the completion of the filling can be appropriately determined by the user in consideration of various circumstances. The execution of step S127 ends the evaluation of the filling of the injection material.

  Next, a procedure in a preparation stage for performing the next evaluation will be described. First, the user operates the injection material pressure adjusting handle 34a to lower the injection material pressure (step S129). After confirming that the injection material pressure has dropped to the predetermined value, the user operates the cock 46a to open the water supply valve 46 and supply water to the filling unit 10 (step S133). At this time, the user presses the water pressure value by the water pressure gauge 52 and the injection material pressure sensor 27 so that the injection material does not flow backward through the injection material supply valve 26 and the injection material supply tube 24 due to an excessive pressure difference between the water and the injection material. The pressure difference from the pressure of the injected material in the filling section 10 due to the pressure is monitored. After confirming that the filling unit 10 is filled with water, the user closes the water supply valve 46, operates the water pressure adjustment handle 54a to reduce the water pressure (step S135), and connects the water supply tube 44 with the water supply valve. 46 (step S137). Next, the filling unit 10 is removed from the injection material filling evaluation device 100 (Step S139), and the filling unit 10 is disassembled and washed (Step S141). When the cleaning of the filling unit 10 is completed in step S141, the user assembles the filling unit 10 again and attaches it to the injected material filling evaluation device 100. Then, the water supply tube 44 and the injection material supply tube 24 are connected to the filling unit 10 (Step S145). As a result, preparation for using the injected material filling evaluation device 100 is completed again, and the user can return to step S101 and start using the same.

  Next, it was verified whether or not the filling of the injection material with respect to the crack of the structure can be simulated using the injection material filling evaluation device 100 of FIG. According to Non-Patent Document 2, it is described that "cracks having a width of 0.3 mm or more are not affected by clogging." Therefore, a crack width of 0.3 [mm] is simulated. Plate thickness: 0.3 [mm] was adopted. As for the water pressure, the pressure of the injection material was changed with respect to a water pressure of 0.005 [MPa] corresponding to a water head of 0.5 [m], and five types of injection materials having different viscosities ν were prepared and the filling time s was measured. Was done.

FIG. 8 shows the injection pressure difference (horizontal axis) between the injection material and water when the viscosity ν of the injection material is changed from 10 to 14000 [cps], and the filling time s (vertical axis) measured in step S127 of FIG. 3 is a graph showing the relationship with the axis (A). Note that 1000 [cps] = 1 [Pa · s]. The experimental results are shown by plots, and the calculation results are shown by curves. In FIG. 8, the above-mentioned middle plate thickness ω = 0.3 × 10 ⁻³ [m] and water pressure = 0.005 [MPa] are used as conditions common to each experiment and calculation.

Here, a method of calculating the filling time s on the vertical axis of FIG. 8 by calculation will be described. According to Non-Patent Document 2, the leakage flow rate Q [m ³ / s] at the cracked portion can be calculated by the following equation (1).

ここで、Ｑ：漏れ流量［ｍ^３／ｓ］、Ｃ_ｗ：低減係数、Ｌ：ひび割れ長さ［ｍ］（図２の充填空間Ｆの奥行き方向長さ）、ω：ひび割れ幅［ｍ］（中板厚み）、ΔＰ：注入圧力差［Ｐａ］、ν：粘度［Ｐａ・ｓ］、ｔ：ひび割れ深さ［ｍ］（図２の充填空間Ｆの左右方向長さ）である。

Here, Q: leakage flow rate [m ³ / s], C _w : reduction coefficient, L: crack length [m] (length in the depth direction of the filling space F in FIG. 2), ω: crack width [m] ( Medium thickness), ΔP: injection pressure difference [Pa], ν: viscosity [Pa · s], t: crack depth [m] (length of filling space F in FIG. 2 in the left-right direction).

Further, since the leakage flow rate Q satisfies the relationship of Q = (t × L × ω) / s (s: filling time), when the reduction coefficient C _w = 1 and the equation (1) is modified, the following equation (1) is obtained. 2) can be derived.

ここで、ｓ：充填時間［ｓ］である。

Here, s is the filling time [s].

  As shown in FIG. 8, it can be seen that the plot of the experimental value for each viscosity ν agrees well with the calculated value under the same conditions. As a result, it was found that the injection material filling evaluation device 100 can simulate the filling of the injection material with respect to the crack of the structure. According to the results of FIG. 8, the filling time s tends to increase as the injection pressure difference decreases, and if the injection pressure difference is constant, the filling time s increases as the viscosity of the injection material increases. You can see that.

  In the present embodiment, the height of the filling space F is configured to be changeable by changing the thickness of the middle plate 14, but the present invention is not limited to this mode. For example, in FIG. The length may be changeable. Further, the length of the filling space F in the left-right direction in FIG. 2 may be additionally configured to be changeable.

  Further, in the present embodiment, the filling space F is formed by providing the opening 14a in the middle plate 14, but the present invention is not limited to this mode, and a concave portion opened to the transparent member 16b may be provided instead of the opening 14a. Good. In this case as well, the recess may have an opening communicating with the groove 12a at the left and right ends in FIG.

  As described above, according to the present embodiment, the filling portion 10 simulating the crack of the structure is provided, and the filling space F corresponding to the crack is covered with the transparent member 16b so that the filling space F can be visually recognized from the outside. Was configured to be able to be injected into the filling section 10 while adjusting the injection pressure. Further, the size of the filling space F corresponding to the width of the crack can be changed. This makes it possible to visually check the filling state of the injected material with respect to cracks in the structure, and to easily find the optimum filling conditions under which the injected material is most effective by changing conditions such as the injection pressure difference and the viscosity ν of the injected material. It becomes possible. Further, since the filling time s can be predicted, it is possible to suppress a problem that the filling material hardens before the filling time s and the filling cannot be sufficiently performed.

  Further, according to the present embodiment, when injecting the injectable material, the filling portion 10 can be filled with water at a predetermined water pressure, so that the cracked portion is filled with water due to water leakage. The filling of the injection material can be simulated. In addition, it is possible to perform an experiment in accordance with the water pressure of the environment where the water leakage occurs.

  Further, according to the present embodiment, since the water injection hole 46b is provided so as to face the injection material injection hole 26b, the water can be reliably discharged from the filling portion 10 by the injection pressure difference, and the water is filled. It is possible to accurately simulate the filling of the cracked portion with the injection material.

  In addition, according to the present embodiment, the filling space F of the filling unit 10 is constituted by the middle plate 14 having the opening 14a, so that the height of the filling space F can be easily changed by changing the thickness ω of the middle plate 14. This can simulate a change in the width of a crack. Further, by changing the shape of the opening 14a, various crack widths and shapes can be expressed.

  In addition, according to the present embodiment, since the cover plate 16 is configured to be detachable from the substrate 12 and the intermediate plate 14, the filling space F of the filling unit 10 can be easily cleaned by removing the cover plate 16 after the evaluation. can do. As a result, the filling unit 10 can be easily made reusable, so that the filling condition of the filling material can be efficiently found while the running cost of the filling material filling evaluation apparatus 100 is suppressed.

  Further, according to the present embodiment, the filling unit 10 has the filling material pressure sensor 27 in the filling space F, so that the filling pressure in the filling space F at the time of filling the filling material is more accurately grasped. be able to. Further, when the pressure sensors 27 and 47 are provided on both the injection material supply side and the water supply side, the injection pressure difference Δp having a correlation with the charging time s can be more accurately detected. And the filling time s can be grasped more accurately.

  Further, according to the present embodiment, since the transparent member 16b is made of an acrylic resin, the filling unit 10 can be manufactured at low cost and easily.

  In addition, according to the present embodiment, it is possible to grasp the time until the filling material is filled under various conditions, so that as a countermeasure for aging of social capital, repeated repairs and reduction in the proof stress of the structure are minimized. It can be suppressed.

  Although the present invention has been described with reference to the drawings and embodiments, it should be noted that those skilled in the art can easily make various changes and modifications based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, functions included in each component, each step, and the like can be rearranged so as not to be logically inconsistent, and a plurality of components, steps, and the like can be combined into one or divided. It is. In addition, although the present invention has been described centering on the device, the present invention can be realized as a method, a program, or a storage medium storing the program, which is executed by a processor included in the device. Should be understood to include these.

DESCRIPTION OF SYMBOLS 10 Filling part 12 Substrate 12a Groove part 14 Middle plate 14a Opening 16 Cover plate 16a Pressing member 16a1 Cover plate opening 16b Transparent member 18 Sealing rubber 20 Filling material supply unit 22 Filling material cylinder 24 Filling material supply tube 26 Filling material supply valve 26a Cock 26b Injection material injection hole 27 Injection material pressure sensor 28 Discharge valve 30 Injection material pressure adjustment unit 32 Injection material pressure gauge 34 Injection material pressure regulator 34a Injection material pressure adjustment handle 36 Injection material compressor 40 Water supply unit 42 Water supply cylinder 44 Water supply tube 46 Water supply valve 46a Cock 46b Water injection hole 47 Water pressure sensor 50 Water pressure adjustment unit 52 Water pressure gauge 54 Water supply pressure regulator 54a Water pressure adjustment handle 56 Water supply compressor 100 Injection material filling evaluation device F Filling space

Claims (7)

A filling section having a filling space for the injection material,
An injection material supply unit for supplying the injection material to the filling unit,
An injection material pressure adjusting unit that adjusts an injection pressure for injecting the injection material into the filling unit,
The filling unit includes:
A substrate that have a grout injection hole for injecting the injection material communicating with said injection material supply unit,
A middle plate having a recess or opening fixed to the substrate and forming the filling space ,
A lid plate fixed to the middle plate and at least partly composed of a transparent member ;
With
The filling material filling evaluation device is characterized in that the size of the filling space can be changed in at least one direction perpendicular to the filling material filling direction. A water supply unit for supplying water to the filling unit,
Further comprising a water pressure adjusting unit for adjusting a water pressure for injecting water into the filling unit,
The filling material filling evaluation device according to claim 1, wherein the filling unit has a water injection hole that communicates with the water supply unit and injects water.   The injection material filling evaluation device according to claim 2, wherein the water injection hole is provided to face the injection material injection hole. The injection material filling evaluation device according to any one of claims 1 to 3, wherein the lid plate is detachably fixed to the substrate and the middle plate. 5. The medium plate according to claim 1, wherein the middle plate is detachably fixed to the lid plate and the substrate, and the size of the filling space can be changed by changing a thickness of the middle plate . 6. An injection material filling evaluation device according to claim 1. The injection material filling evaluation device according to any one of claims 1 to 5 , wherein the filling unit further includes a pressure sensor that detects a pressure of the injection material in the filling space. The transparent member is an acrylic resin, grout filling evaluation device according to any one of claims 1 to 6.

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