JP2001356082A - Method and apparatus for judging plastic properties of injection material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus capable of properly judging the plastic properties of a plastic injection material. SOLUTION: The apparatus for judging the plastic properties of the plastic injection material is constituted of a truncated cone-shaped fall cone, a fall cone holder for freely holding and dropping the fall cone on the surface of the injection material and a display device for displaying the value of the plastic properties of the injection material on the basis of the penetration quantity of the fall cone to the injection material to judge the plastic properties of the injection material on the basis of the penetration quantity of the fall cone to the injection material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for judging the plasticity of an injection material, and more particularly, to the plasticity immediately after mixing of an injection material having plasticity that can be injected according to the shape of a filling portion such as a cavity of a structure. The present invention relates to a method and an apparatus for determining the plasticity of an injection material, which can easily and quantitatively determine the shape.

[0002]

2. Description of the Related Art As a plastic injection material, for example, a cement-based solidifying material (material A) and an inorganic plasticizing aid (material B) such as bentonite are turbid with water, and are pumped by a pump in the form of milk. A method has been proposed in which a plastic injection material is prepared by mixing with a static mixer or the like immediately before the filling section (see JP-A-11-310779).

[0003] In filling such a plastic injection material, an injection material having an appropriate plasticity so that the filling portion is filled without leakage and which does not leak out from the filled cavity once filled is required. Have been.

[0004] That is, if the plasticity is too high, an unfilled portion is generated in the filled portion, and if the plasticity is low, it leaks from the once filled injection portion.

[0005] For this reason, in the conventional plastic filler, the compounding amount of the material A and water and the compounding amount of the material B and water are determined so that an injection material having necessary plasticity is formed in a compounding test in advance. It is possible to test whether the required plasticity is obtained even at the construction site. Further, in the case of a water glass-based filler or the like, it is assumed that a predetermined plasticity is obtained by controlling the flow rates of both the A and B liquids, and a normal test is not performed.

[0006] Conventionally, the determination of the plastic property is a so-called flow test, "air mortar and test method for air mortar".
(JHS (Japan Highway Public Corporation Standard) A313-1992).

In the flow test, the inner diameter is 80 mm and the height is 80 m
m cylinder is placed on a horizontally arranged flat plate with a side of 400 mm, and the sample is gently inserted to the top of the cylinder so as not to overflow the cylinder, so that the surface of the sample is horizontal and coincides with the top of the cylinder. After gently tapping the side of the cylinder with a finger, gently pull up the cylinder in the vertical direction, measure the diameter of the spread sample one minute later in the maximum direction and the direction perpendicular thereto, and determine the judgment value (mm). This is a flow value.

[0008] Among the plastic injection materials currently used, those having a flow value of 80 mm to 120 mm are provided with appropriate plastic properties.

Incidentally, this flow test is specified for "air mortar" and is for a sample having relatively high fluidity.

For this reason, when an injection material having low plasticity, that is, high flowability is used as a sample, the flow value is obtained as 80 mm or more, which can be a criterion for determining the plasticity.

[0011]

However, when an injection material having high plasticity, that is, low flowability is used as a sample, the sample does not spread while maintaining the shape injected into the cylinder and becomes 80 mm even when the cylinder is pulled up. Sometimes.

When the plasticity of the sample is high,
Even if the same flow value of 80 mm is obtained, the plasticity is not always the same. That is, in the sample having the same size of 80 mm in this flow test,
There are cases where the plastic properties are different, that is, there are cases where it is hard and cases where it is soft, and it cannot be evaluated uniformly.

In addition, when the cylinder is pulled out vertically, the sample may adhere to the inner wall of the cylinder, and the samples having the same plasticity are judged, and the judgment results are different, and the reliability is low. Becomes

As another test which can be considered as another method for judging the plasticity of a sample, a description of a physical test method of cement (JIS R 520) which is a setting test of cement.
1-1997) and a soil test "Liquid limit test method for soil using fall cone" (JGS (Geotechnical Society of Japan) T142-1997). The amount of penetration of the cone is large, and the injection material penetrates to the bottom of the container. After all, these test methods are intended for a sample in a solidified region that is harder than the injection material of the present application, and have been found to be unsuitable for determining the plasticity of the injection material.

It is an object of the present invention to provide a new method and apparatus for judging the plasticity of an injection material, which can appropriately judge the plasticity of a plastic injection material that cannot be determined by the current test method.

[0016]

According to the first aspect of the present invention, a fall cone having a truncated conical shape obtained by cutting off a pointed end of a cone is penetrated into the surface of the injection material. This is a method for determining the plasticity of the injection material, which comprises determining the plasticity of the injection material based on the amount.

According to a second aspect of the present invention, there is provided an injection material comprising a frusto-conical fall cone, and a penetrating device for freely holding and penetrating above the surface of the injection material of the fall cone. Is a plastic property judging device.

According to a third aspect of the present invention, there is provided the apparatus according to the second aspect, further comprising a display device for displaying a value of the plasticity of the injection material based on an amount of penetration of the fall cone into the injection material. This is a plastic property judging device.

[Operation] According to the method and apparatus for judging the plasticity property according to the present invention, the shape and dimensions of the fallcone suitable for the plasticity property of the required injection material are appropriately selected so that the fallcorne penetrates the sample. Then, the plasticity of the injected material can be determined simply by reading the amount of penetration into the fall cone.

At this time, if a truncated cone is used as the fall cone, the amount of penetration into the injection material can be adjusted by changing the size of the truncated cone, and a wide range of plasticity can be determined. can do. In addition, this method can reduce the difference in the weight of the fall cone due to the change in the shape of the fall cone compared to the method of adjusting the amount of penetration by changing the vertex angle of the side of the fall cone. Is very easy.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the method and apparatus for judging plastic properties according to the present invention will be described below. FIG. 1 shows a plastic property judging device according to an embodiment of the present invention.

The plasticity property judging device 10 includes a fall cone 20, a support device 50 for supporting the fall cone movably in a vertical direction, a pedestal 60 on which the support device 50 is erected, and a support for the fall cone 20. A drop device 30 which is held at a predetermined position of the device 50 and vertically penetrates by operation, and a display device 40 which displays the value of the plasticity of the injection material
Consists of

The pedestal 60 is constructed so that it can be horizontally arranged by three height adjusting legs 61 provided at three places. The supporting device 50 is provided with the pedestal 60 thus adjusted horizontally. Slide bearings 51 and 52 provided above and below 50
Are arranged in a straight line in the vertical direction.

As shown in FIG. 1, the fall cone 20 has a shape in which the tip of a regular cone that is narrowed downward is cut off, that is, a truncated cone-shaped cone body 21, and an upper side along the axis of the cone body 21. It is composed of a cone rod 22 which is erected and a knob 23 for moving the fall cone. In this example, the small diameter φ1 of the cone body is 20 mm, the large diameter is 50 mm,
The height t is set to 50 mm, and the apex angle θ of the side surface is set to 30 ° (see FIG. 1 (2)).
The dimensions and shape of these fall cones can be changed as necessary. In this example, the movable range of the fall cone is such that the distance between the lower surface 21c of the bottom wall 21a of the cone body 21 and the pedestal 60 is the maximum dimension h1.
(Shown in FIG. 1 (1): for example, 60 mm), the minimum h2
(Shown in FIG. 1 (2): for example, 10 mm).

In this embodiment, the weight of the fall cone 20 including the cone body 21 and the cone rod 22 is reduced by 10%.
In order to make it 0 g, it is configured to be hollow including the bottom wall portion 21a and the side wall portion 21b, and the cone rod 22 is screwed and fixed. The cone rod has a cylindrical shape, and is formed so that it can slide freely on the slide bearings 51 and 52 of the support device 50 with a small resistance in the vertical direction.

The drop device 30 has a knob portion 31 which can be rotated by a finger and a screw portion 32 which is screwed into a slide bearing 52 below the support device 50 and whose tip can move so as to be in contact with and detachable from the cone rod 22. And has a function of freely falling so that friction does not occur on the fall cone. The falling device is not limited to the above-mentioned screw type, but may have another configuration such as a cam type or an electromagnetic type.

Further, the display device 40 is provided between the vertical slide bearings 51 and 52 of the support device.
m) a scale plate 41 for displaying other values and an indicator 4 attached to the cone bar 22 for moving with the fall cone 20 and reading the scale of the scale plate 41
2 is provided. The display device 40 is not limited to the above-described structure, but may be a mechanical type, an electric type, or an optical type. In other words, a value indicating the plasticity of the injection material determined by the amount of penetration of the fall cone (penetration). mm value, a value corresponding to the flow value, and other values).

When using the present apparatus, the fall cone 20 is first moved to the uppermost position and fixed.
Then, the plastic injection material immediately after the kneading is put in a predetermined container and placed on the pedestal 60 at a position where the fall cone 20 does not come into contact with the container even if the cone body 21 penetrates.

Here, as the container, for example, a cylindrical container (hard PVC pipe) having an inner diameter of 83 mm and a depth of 50 mm with a bottom plate can be used. The specimen is filled and placed in the full container.

Next, the position of the fall cone 20 is adjusted, the tip of the cone body 21 is fixed so as to be in contact with the surface of the specimen, and the fall cone is dropped by a drop device. As a result, the fall cone penetrates into the specimen by its own weight.

Then, with the penetration stopped, the final penetration amount and other values are read from the scale indicated by the index,
The plasticity of the specimen can be determined.

[0032]

[Embodiment 1] This embodiment shows the results of a judgment made on a cone body at various angles and a plastic injection material using the above apparatus. FIG. 2 shows the relationship between the value of the flow value (mm) in the test method shown in the conventional example and the amount of penetration (mm) used in the plastic property judging device according to the present invention. This judgment was performed under the following conditions.

[0033]Specimen container shape  Uses a rigid PVC pipe with a bottom plate attached. Pipe name: Thin-walled pipe VU JIS K6741 Pipe standard: Nominal diameter 75 × 89 × 2.7 mmSpecimen composition  Change the mixing ratio of liquid A and liquid B to change the plasticity
You. (4 liter blend) Liquid A: 20-95%, Liquid B: 80-5% (volume) Liquid A: W / C = 50% cement milk or cement
Air milk In the case of air bubbles (cement air milk), A liquid: air bubbles
= 1: 0.62 (volume) Density 1110 g / L (1.11 g / cm)^Three B) Water: bentonite = 1: 7.1 (weight ratio) bentonite
SolutionCone body shape  Testing was performed at cone angles of 30, 45 and 60 degrees. In addition, more than 60 °
In this case, the test container should be
Need to be large, and the weight of the fall cone
It becomes heavier and too hard to penetrate, making it difficult to judge, and 30 °
If it is less than this, the amount of penetration becomes too large and it is not suitable.
It was known in advance.

From the results shown in FIG. 2, it was confirmed that the smaller the angle of the cone body, the more likely the difference was in the value of the amount of penetration. For this reason, it was confirmed that an angle of the cone body of about 30 ° was appropriate.

Example 2 In this example, a test was performed on a cone body whose cut amount (diameter) at the tip was changed.
In this example, cement air milk was used as a specimen. In other words, even when the angle of the cone body is set to 30 ° as confirmed in Example 1, the penetration amount is large (about 50 mm or more) when the flow value of the injection material, which is currently considered appropriate, is about 120 mm. ), The amount of movement of the fall cone must be set large for the determination, and the device becomes large. Therefore, the penetration amount should not exceed 50 mm even at a necessary flow value (about 120 mm). It is necessary to set. Therefore, a similar test was performed for a case where the tip of the cone body was cut into a truncated cone shape. Table 1 shows the results.

[0036]

[Table 1]

From the results shown in Table 1, the plasticity of the injection material currently used when the diameter of the tip of the cone body is 18 mm to 22 mm (flow value 120 mm to 80 mm)
It was confirmed that a good determination could be made for. On the other hand, those having a diameter of 0 mm to 10 mm have a flow value of 12 mm.
It was confirmed that a specimen having a diameter of 0 mm or more could not be determined, and that a specimen having a diameter of 30 mm had a small difference in the determination value of a specimen having a flow value of about 85 mm or less.

[Embodiment 3] In this embodiment, an angle 3 of the cone body is used.
It is a result of confirming the correlation between the flow value and the penetration value in the case where the diameter at the 0 ° tip is 20 mm. In this example, cement air milk was used as a specimen.

In this example, the determination was made by using the apparatus described in the embodiment (the diameter of the cone body at an angle of 30 ° at the tip is 20 mm). The result is shown in FIG.

As shown in FIG. 3, there is a high correlation between the flow value and the penetration value, and there is a difference in the penetration amount even when the flow value judgment is added (attached) (□ in the figure).
Mark), it was confirmed that the determination when the plasticity was strong was possible.

[0041]

As described above, according to the method and apparatus for judging the plastic property according to the present invention, by appropriately selecting the shape and size of the fall cone suitable for the plastic property of the required injection material, Into the fall cone,
With the simple operation of reading the amount of penetration of the fall cone, there is an effect that the plasticity of the plastic injection material that cannot be determined by the current test method can be properly determined.

According to the present invention, when a fall cone having a truncated cone shape is used, the amount of penetration into the injection material can be more appropriately adjusted by changing the size of the truncated cone. Thus, there is an effect that a wide range of plasticity can be determined.

[Brief description of the drawings]

FIG. 1 is a view showing a plastic property judging device according to an embodiment of the present invention, (1) is a front view, (2) is a side view,
(3) is a plan view.

FIG. 2 is a graph showing the results of a test performed to determine the shape of a fall cone in the plastic property determination device of the present invention.

FIG. 3 is a graph showing a relationship between a plasticity result of a plastic injection material and a flow value of the same material in the plastic shape determination device shown in FIG.

[Explanation of symbols]

 Reference Signs List 10 plasticity property device 20 fall cone 21 cone body 22 cone rod 23 knob 30 drop device 40 display device 41 scale plate 42 index 50 support device 60 pedestal

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tsukasa Uchizawa 585 Tomimachi, Funabashi-shi, Chiba Sumitomo Osaka Cement Co., Ltd. Cement Concrete Laboratory Kanto Technical Center (72) Inventor Yoshinori Matsuda 2-chome Yoyogi, Shibuya-ku, Tokyo No. 2 in the East Japan Railway Company

Claims (3)

[Claims] The present invention is characterized in that the plasticity of an injection material is determined based on the amount of penetration of the fall cone into the injection material when the truncated cone-shaped fall cone having the tip of the cone cut off penetrates the injection material surface. Method for determining the plasticity of the injection material. 2. An apparatus for determining the plasticity of an injection material, comprising: a truncated cone-shaped fall cone; and a penetrating device for freely holding and penetrating above the surface of the injection material of the fall cone. 3. The apparatus for determining the plasticity of an injection material according to claim 2, further comprising a display device for displaying a value of the plasticity of the injection material based on the amount of penetration of the fall cone into the injection material.