JP2018184796A - Filling evaluation method of grout material and filling evaluation member of grout material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filling evaluation method of grout material capable of evaluating the filling state of a grout material in a sheath tube by a simple method.SOLUTION: A part of a small piece 3 having elasticity and having a color portion 3B visible to the outside through a sheath tube 2 when the whole is attached to an inner wall surface 2A is attached to the inner wall surface 2A of the sheath tube 2 and a grout material G is filled inside the sheath tube 2. When the small piece 3 is immersed in the grout material G, the small piece 3 is brought into close contact with the inner wall surface 2A and the color portion 3B can be visually recognized from the outside through the sheath tube 2.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a grout filling evaluation method and a grout filling evaluation member.

In the post-tension method and the pre-tension method, a PC steel material, for example, a PC steel material such as a PC steel wire, a PC steel twisted wire, and a PC steel material is known as a tension wire. Since the PC steel material must avoid direct contact with concrete, it is arranged inside the sheath tube.
The inside of the sheath tube in which the PC steel material is arranged is filled with a grout material. The grout material must be filled in a predetermined amount inside the sheath tube.

Conventionally, a sheath tube made of a transparent polystyrene resin (PS) has been used. If the sheath tube is transparent, it can be easily evaluated visually whether or not the amount of the grout material filled therein is a predetermined amount.
However, recently, a sheath tube made of high-density polyethylene (HDPE), which is a resin that is difficult to break, has been used because the sheath tube of polystyrene resin has problems such as breakage.
The sheath tube using high-density polyethylene resin is milky white translucent, and the grout material itself is often milky white, so it is not easy to visually check whether or not the filling amount of the grout material is a predetermined amount. .

Therefore, as a method of evaluating the filling of the grout material when the PC steel material is covered with a sheath tube made of high-density polyethylene resin, the sheath body made of high-density polyethylene resin into which the PC steel material is inserted is connected to both sides of the sheath body. There is a conventional example in which a filling sensor for detecting a grout filling state is provided in a sheath body (Patent Document 1).
In the conventional example of Patent Document 1, the filling sensor includes a heating element and detection units having thermocouples arranged at two locations, the vicinity of the heating element and a position away from the heating element. The degree of filling of the grout material is detected from the amount of heat radiated. In the detection unit, a thermocouple, a heating element, and a wiring connecting them are formed in a rectangular sheet shape.

Japanese Patent Laying-Open No. 2015-151781

In the conventional example shown in Patent Document 1, since the configuration includes a detection unit having a heating element and a thermocouple, equipment for supplying power to the thermocouple and the heating element, and a signal output from the thermocouple are used. Equipment for analysis is necessary, and the apparatus becomes large.
The construction site does not always have these facilities, and without these facilities, there is a problem that it is not possible to evaluate the filling of the grout material into the sheath tube.

  An object of the present invention is to provide a grouting material filling evaluation method and a grouting material filling evaluation member capable of evaluating the filling state of the grouting material into the sheath tube by a simple method.

  The method for evaluating the filling of a grout material of the present invention is a method for evaluating the filling of a grout material into a translucent sheath tube in which a PC steel material is disposed, and the inner wall surface of the sheath tube has elasticity. And attaching a part of a small piece having a color that can be visually recognized through the sheath tube when the whole adheres to the inner wall surface, and filling the grout material inside the sheath tube. It is characterized by.

In the present invention, first, a part of the small piece is attached to the inner wall surface of the sheath tube. For example, a double-sided tape may be used to attach the small piece to the inner wall surface. The attachment position of the small piece to the inner wall surface is a position that becomes a liquid level when a predetermined amount of grout material is filled.
When the small piece is attached to the inner wall surface, the grout material is filled into the inside of the sheath tube in which the PC steel material is disposed. The arrangement of the PC steel material inside the sheath tube may be before or after the step of attaching the small piece to the inner wall surface of the sheath tube.
When the grout material is filled in the sheath tube in which the PC steel material is disposed, the liquid level of the grout material increases. When the filling of the grout material approaches a predetermined amount, the lower end portion of the small piece is immersed in the grout material. Furthermore, when the grout material is filled, all of the small pieces are immersed in the grout material. Since air is interposed between the small piece before the grout material is immersed and the inner wall surface, the color of the small piece cannot be recognized outside through the translucent sheath tube. When the entire small piece starts to soak in the grout material, the air between the small piece and the inner wall surface is eliminated, and eventually the entire surface of the small piece adheres to the inner wall surface, or liquid enters between the sheath tube and the small piece. Due to the change in the refractive index, the small piece is in a state of being in close contact with the inner surface of the sheath tube in a pseudo manner. That is, the entire surface of the small piece adheres to the inner wall surface of the sheath tube so that the fallen leaves wet with water stick to the polished glass.
Since the small piece has a color that can be visually recognized through the sheath tube when attached to the inner wall surface, the small piece can be visually recognized from the outside even if the grout material is the same translucent as the sheath tube.
If the grout material filled in the sheath tube leaks by mistake, the liquid level of the grout material is lowered. As the liquid level of the grout material is lowered, the small piece is exposed from the grout material, but the small piece is separated from the inner wall surface by its elastic force. When the small piece that is in close contact with the inner wall surface is separated from the inner wall surface, the color that can be visually recognized from the outside can no longer be visually recognized, and it can be recognized that the grout material has leaked.
Therefore, in the present invention, it is possible to evaluate whether or not a predetermined amount of the grout material is filled only by using a small piece, and therefore, the filling evaluation of the sheath tube of the grout material can be realized by a simple method.

In the present invention, the PC steel material includes a first PC steel material and a second PC steel material arranged in series, and a coupler that connects the first PC steel material and the second PC steel material, and the sheath tube includes: A sheath body that covers the coupler, and a coupler sheath joint that is connected to at least one end of the sheath body and covers at least one of the first PC steel material and the second PC steel material, A cylindrical portion for communicating the inside and outside of the sheath tube may be formed, and a part of the small piece may be attached to one inner wall surface of the coupler sheath joint and the sheath body.
In this configuration, the PC steel material in which the first PC steel material and the second PC steel material are connected by a coupler is covered with a sheath tube having a sheath body and a coupler sheath joint, and when the grout material is filled, the liquid level is A small piece can be visually recognized from the outside through the inner wall surface of the coupler sheath joint.
That is, a part of a small piece is attached to the inner wall surface of the coupler sheath joint or the sheath body, and thereafter, one end of the first PC steel material and the second PC steel material is covered with the coupler sheath joint, and the sheath body and the PC coupler sheath joint are covered. And the first PC steel material and the second PC steel material are coupled by a coupler. Thus, when the sheath tube is set on the first PC steel material, the second PC steel material, and the coupler, the inside of the sheath tube is filled with a grout material.
When the sheath tube is filled with the grout material, the liquid level of the grout material rises. When the filling of the grout material approaches a predetermined amount, a small piece partially attached to the inner surface of the coupler sheath joint or the sheath body is immersed in the grout material. When all of the small pieces are immersed in the grout material, the entire surface of the small pieces comes into close contact with the inner wall surface of the coupler sheath joint provided with the small pieces, and the small pieces can be visually recognized from the outside.
Therefore, even when the sheath tube is composed of a plurality of members, it is possible to appropriately evaluate the filling of the grout material.

The grout material filling evaluation member of the present invention is a grout material filling evaluation member used for evaluating the filling of a grout material into a translucent sheath tube in which a PC steel material is disposed. A part of the sheath tube that can be attached to the inner wall surface and is an elastic small piece, and the small piece has a color that can be visually recognized through the sheath tube when the whole piece is attached to the inner wall surface. Features.
In the present invention, a part of the small piece is attached to the inner wall surface of the sheath tube, and the inside of the sheath tube into which the PC steel material is inserted is filled with the grout material. When the filling of the grout material reaches a predetermined amount, the small piece is immersed in the grout material, and the entire surface of the small piece adheres to the inner wall surface. Since the small piece has a color that can be visually recognized through the sheath tube, it can be visually recognized from the outside through the sheath tube, and whether or not the filling of the grout material is appropriate can be visually evaluated.
In the present invention, since the filling evaluation member is composed of small pieces having a predetermined color, the structure of the filling evaluation member can be simplified.

In the present invention, the small piece may have a configuration in which a plurality of concave portions and convex portions are formed side by side.
In this configuration, when the entire small piece starts to be immersed in the grout material, the tip of the convex portion of the small piece comes into contact with the inner wall surface, and air is released from the gap between the inner wall surface that is in contact with the tip of the convex portion and the concave portion. Will be eliminated. Further, as the grout material is filled, the small piece is elastically deformed in an attempt to be in close contact with the inner wall surface. When the small piece comes into close contact with the inner wall surface, the color of the small piece can be visually recognized through the sheath tube.
Here, as long as the small piece is elastically deformed and adheres to the inner wall surface over almost the entire surface, there may be a portion that does not adhere to a part. That is, the deepest portion of the concave portion of the small piece does not necessarily adhere to the inner wall surface, but even in this case, there is no problem because the color of the small piece can be visually recognized through the sheath tube.
In this configuration, it is possible to evaluate the filling of the grout material with a simple structure in which the concave portion and the convex portion are formed side by side on the small piece.

In the present invention, the small piece may have a structure in which a plurality of holes penetrating in the thickness direction are formed.
In this configuration, when the entire small piece starts to immerse in the grout material, the plane of the small piece comes into contact with the inner wall surface, and the air between the flat surface of the small piece and the inner wall surface passes through the periphery of the small piece or Excluded through multiple holes. Furthermore, the small piece is elastically deformed in an attempt to closely contact the inner wall surface. Here, as long as the small piece is elastically deformed and adheres to the inner wall surface over almost the entire surface, there may be a portion that does not adhere to a part.
In this configuration, it is possible to evaluate the filling of the grout material with a simple structure in which a plurality of holes penetrating in the thickness direction of the small pieces are formed.

Sectional drawing which shows the sheath pipe | tube used in order to implement the filling evaluation method of the grout material concerning 1st Embodiment of this invention, and PC steel materials arrange | positioned inside a sheath pipe | tube. The perspective view which shows the sheath pipe | tube with which the small piece was attached. One embodiment of a small piece is shown, (A) is a perspective view, (B) is a sectional view. The other embodiment of a small piece is shown, (A) is a perspective view, (B) is sectional drawing. (A) to (D) are cross-sectional views showing the procedure of the grout filling evaluation method according to the first embodiment. (A) (B) is the schematic explaining the state which a small piece adheres to the inner wall face of a sheath pipe | tube. Sectional drawing which shows the sheath pipe | tube used in order to implement the filling evaluation method of the grout material concerning 2nd Embodiment of this invention, and PC steel materials arrange | positioned inside a sheath pipe | tube.

Embodiments of the present invention will be described with reference to the drawings.
1 to 6 show a first embodiment of the present invention.
[First Embodiment]
FIG. 1 shows a state where a part of the PC steel material 1 is covered with a sheath tube 2.
In FIG. 1, a grout material G is filled between the sheath tube 2 and the PC steel material 1.
A small piece 3, which is a member for filling evaluation, is attached to the inner wall surface 2 </ b> A of the sheath tube 2.

The steel material 1 includes a first PC steel material 11, a second PC steel material 12, and a coupler 13 arranged on the same core.
The first PC steel material 11 includes a PC steel bar 11A having a male screw portion on the outer periphery, a black polyethylene sheath 11B covering the periphery excluding the end of the PC steel bar 11A, and a grout material filled in the polyethylene sheath 11B. And G.
The second PC steel material 12 includes a PC steel rod 12A having a male screw portion on the outer periphery, a black polyethylene sheath 12B covering the periphery excluding the end of the PC steel rod 12A, and a grout material G filled in the polyethylene sheath 12B. And is configured.
The polyethylene sheaths 11B and 12B are formed with male screw portions 11C and 12C on the peripheral surface.
The coupler 13 is a nut-like member that connects the end of the PC steel rod 11A and the end of the PC steel rod 12A.

The sheath tube 2 includes a sheath body 20 that covers the periphery of the coupler 13, a first coupler sheath joint 21 that is connected to one end portion of the sheath body 20 and covers the end portion of the first PC steel material 11, and the other sheath body 20. A second coupler sheath joint 22 connected to the end portion and covering the end portion of the second PC steel material 12, and these members are each made of high-density polyethylene and are milky white translucent.
The sheath body 20 is a cylindrical member, and an external thread portion 20A is formed on the outer periphery thereof.

The first coupler sheath joint 21 includes a large-diameter female screw portion 21A that is screwed into the end portion of the male screw portion 20A of the sheath body 20, and a conical portion 21B that is integrally formed with the female screw portion 21A and decreases in diameter toward the end portion. A small-diameter female screw portion 21C formed integrally with the conical portion 21B and screwed into the male screw portion 11C of the polyethylene sheath 11B, and a cylindrical portion 21D formed on the peripheral surface of the conical portion 21B.
The second coupler sheath joint 22 includes a large-diameter female screw portion 22A that is screwed into the end portion of the male screw portion 20A of the sheath body 20, a conical portion 22B that is integrally formed with the female screw portion 22A and decreases in diameter toward the end portion. A small-diameter female screw portion 22C formed integrally with the conical portion 22B and screwed into the male screw portion 12C of the polyethylene sheath 12B, and a cylindrical portion 22D formed on the peripheral surface of the conical portion 22B.

The cylindrical portions 21D and 22D are for communicating the inside and outside of the sheath tube.
In the present embodiment, the cylindrical portion 21D of the first coupler sheath joint 21 fills the sheath tube 2 with the grout material G, and the cylindrical portion 22D of the second coupler sheath joint 22 is the interior of the sheath tube 2. When the grout material G is filled, the air inside the sheath tube 2 is discharged.
The cylindrical portion 21D is arranged so that the tip thereof is inclined obliquely downward, and a tube of a grout material filling device (not shown) can be connected to the tip portion.
Cylindrical part 22D is arrange | positioned so that a front-end | tip may face diagonally upward, and the front-end | tip is open | released by air | atmosphere.

In FIG. 1, the entire surface of the small piece 3 is shown in close contact with the upper part of the inner wall surface 2 </ b> A of the conical portion 21 </ b> B of the first coupler sheath joint 21.
The specific structure of the small piece 3 of this embodiment is shown in FIGS.
As shown in FIG. 2, the small piece 3 includes a tape portion 3 </ b> A and a color portion 3 </ b> B that is formed in a part of the tape portion 3 </ b> A and has a color that can be visually recognized through the sheath tube 2. Here, the color part 3B refers to a colored part that is seen through the milky white translucent sheath tube 2. For example, the colored part 3B is a colored part such as black, blue, red, green, and the like. A portion of the small piece 3 that does not constitute the color portion 3B is a portion having a different color from the color portion 3B, and this portion may be the same milky white as the sheath tube 2.

In the present embodiment, the color part 3B is attached to the small piece 3 so as to constitute a predetermined character. Any character can be used as long as it can be seen through the sheath tube 2 from the outside of the sheath tube 2. In this embodiment, the character is “OK”.
Other than “OK”, characters such as “no problem” and “pass” may be used, symbols such as circles, triangles and squares may be used, and further, the entire surface of the small piece 3 without using characters or symbols. Alternatively, a part of the color portion 3B may be used.

The specific structure of the small piece 3 of this embodiment is shown in FIG.3 and FIG.4.
FIG. 3 shows an embodiment of the small piece 3.
In FIG. 3, the tape portion 3A is a member made of synthetic resin having elasticity, for example, a member made of low-density polyethylene, and the concave portion 3C and convex portion 3D are formed side by side. In order to form the concave portion 3C and the convex portion 3D, a method of pressing the sheet-like tape portion 3A can be employed.
The color part 3B is formed on the plane of the tape part 3A.
FIG. 4 shows another embodiment of the small piece 3.
In FIG. 4, the tape portion 3A has a plurality of holes 3E penetrating in the thickness direction. These holes 3E are regularly formed vertically and horizontally. In order to form the hole 3E, a method of punching the sheet-like tape portion 3A can be employed.

Next, the grout filling evaluation method of the first embodiment will be described with reference to FIGS.
As shown in FIG. 5A, a part of the small piece 3 is attached to the inner wall surface 2 </ b> A of the first coupler sheath joint 21. For example, a double-sided tape 30 is used to attach the inner wall surface 2A of the small piece 3. The attachment position of the small piece 3 is a position indicating that the grout material G is sufficiently filled, and specifically, is an upper portion of the inner wall surface 2A.
Thereafter, the first coupler sheath joint 21 is screwed into the first PC steel material 11, the second coupler sheath joint 22 is deeply screwed into the second PC steel material 12, and the sheath body 20 is further screwed into the second coupler sheath joint 22. Then, the end portions of the first PC steel material 11 and the second PC steel material 12 are connected by a coupler 13, the second coupler sheath joint 22 is returned toward the first coupler sheath joint 21, and the sheath body 20 is further moved to the first coupler sheath. The sheath body 20 is screwed toward the joint 21 so that the sheath body 20 is in a predetermined position. Thereby, as shown in FIG. 5B, the sheath tube 2 is assembled.
The cylindrical portion 21D of the first coupler sheath joint 21 faces obliquely downward, and the tubular portion 22D of the second coupler sheath joint 22 faces obliquely upward.

And the grout material G is filled into the inside of the sheath pipe | tube 2 from the cylindrical part 21D of the 1st coupler sheath coupling 21, as FIG.5 (C) shows. Then, the air inside the sheath tube 2 is discharged from the cylindrical portion 22D of the second coupler sheath joint 22 to the outside.
Then, as shown in FIG. 5D, when the liquid level of the grout material G rises inside the sheath tube 2 and the filling of the grout material G reaches a predetermined amount, the small piece 3 becomes the inner wall surface of the first coupler sheath joint 21. The color part 3B formed in the small piece 3 in close contact with 2A is visually recognized through the milky white translucent first coupler sheath joint 21. By visually recognizing the color portion 3B of the small piece 3 from the outside, it is understood that the sheath tube 2 is filled with the necessary amount of the grout material G.

That is, as shown in FIG. 6A, when the liquid level of the grout material G filled in the sheath tube 2 does not reach the small piece 3, a part of the small piece 3 is inside the first coupler sheath joint 21. It is attached to the wall surface 2A, and the lower end of the small piece 3 is in a state separated from the inner wall surface 2A. Since most of the small piece 3 is separated from the inner wall surface 2 </ b> A, the color portion 3 </ b> B cannot be visually recognized from the outside through the first coupler sheath joint 21.
As shown in FIG. 6B, when the grout material G filled in the sheath tube 2 rises beyond the attachment position of the small piece 3, all of the small pieces 3 are immersed in the grout material G. Then, the entire surface of the small piece 3 comes into close contact with the inner wall surface 2A of the first coupler sheath joint 21 provided with the small piece 3, and the color portion 3B of the small piece 3 can be visually recognized from the outside. As the small piece 3 is immersed in the grout material G, the air between the small piece 3 and the inner wall surface 2A is removed. That is, the small piece 3 shown in FIG. 3 is excluded from the small piece 3 through a gap between the convex portion 3D of the small piece 3 and the inner wall surface 2A, and the small piece 3 shown in FIG. And between the inner wall surface 2A.

If the grout material G filled in the sheath tube 2 leaks by mistake, the liquid level of the grout material G decreases, but the small pieces 3 are exposed from the grout material G as the liquid level of the grout material G decreases. It will be. The small piece 3 is separated from the inner wall surface 2A, and the small piece 3 that is in close contact with the inner wall surface 2A is separated from the inner wall surface 2A, so that the color visually recognized from the outside cannot be visually recognized.
That is, in the small piece 3 shown in FIG. 3, air enters the gap between the convex portion 3D of the small piece 3 and the inner wall surface 2A. In the small piece 3 shown in FIG. 4, the small piece 3 passes through the plurality of holes 3E. 3 and the inner wall surface 2 </ b> A enter the air, and the small piece 3 is separated from the inner wall surface 2 </ b> A except for the portion of the double-sided tape 30.

Therefore, in the first embodiment, the following effects can be achieved.
(1) A part of a small piece 3 having a color portion 3B that has elasticity and can be visually recognized to the outside through the sheath tube 2 when the whole adheres to the inner wall surface 2A is attached to the inner wall surface 2A of the sheath tube 2 Is filled with grout material G. When the small piece 3 is immersed in the grout material G, the small piece 3 comes into close contact with the inner wall surface 2A, and the color portion 3B can be seen through the sheath tube 2 from the outside. Thereby, it is possible to evaluate whether or not the grout material G is properly filled. Since it is possible to evaluate whether or not a predetermined amount of the grout material is filled only by using the small piece 3, the filling evaluation of the sheath tube 2 with the grout material G can be realized by a simple method.

(2) The sheath tube 2 includes a sheath body 20 that covers the coupler 13, a first coupler sheath joint 21 that covers the first PC steel material 11, and a second coupler sheath joint 22 that covers the second PC steel material 12. Since it is attached to the inner wall surface 2A of the first coupler sheath joint 21, even when the sheath tube 2 is divided from a plurality of members, the filling evaluation of the grout material G can be performed appropriately.

(3) The first coupler sheath joint 21 and the second coupler sheath joint 22 are arranged with the sheath body 10 interposed therebetween, and the grout material G is filled from the tubular portion 21D of the first coupler sheath joint 21 and the second coupler sheath joint 22 is disposed. Since the air inside the sheath tube 2 is discharged from the cylindrical portion 22D, the place where the small piece 3 is attached to the first coupler sheath joint 21 is rarely limited. That is, since the small piece 3 needs to be attached at a position where it does not interfere with the tubular portion 21D, if the two tubular portions 21D are provided in the first coupler sheath joint 21, they do not interfere with the two tubular portions 21D. If the small piece 3 is attached to the position, the attachment position is limited as compared with the case of one cylindrical portion 21D.

(4) A member for evaluating the filling of the grout material can be attached to the inner wall surface 2A of the sheath tube 2 to be a small piece 3 having elasticity, and the small piece 3 is sheathed when the whole adheres to the inner wall surface 2A. Since the color portion 3B that can be visually recognized through the tube 2 is provided, the structure of the filling evaluation member can be simplified.

(5) When the small piece 3 has a configuration in which a plurality of concave portions 3C and convex portions 3D are formed side by side or a configuration in which a plurality of holes 3E penetrating in the thickness direction are formed, the small piece 3 is formed. It can be manufactured easily.

(6) Since the tape portion 3A of the small piece 3 is formed of low density polyethylene which is a material that is easily available at a relatively low cost, the small piece 3 can be provided at a low cost.

Next, a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, the structure of the PC steel material 1 and the sheath tube 4 is different from that of the first embodiment, and the structure of the small piece 3 itself is the same as that of the first embodiment. In the second embodiment, the same or similar components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 7 shows the overall configuration of the second embodiment.
In FIG. 7, the PC steel material 1 includes a first PC steel material 11, a second PC steel material 12, and a coupler 13, and the first PC steel material 11 is embedded in the building structure B except for an end portion. Yes. An end of the PC steel rod 11A of the first PC steel material 11 is screwed into the nut 14, and an anchor plate 15 is provided between the nut 14 and the building structure B.

The sheath tube 4 includes a sheath main body 23 whose one end opening is in contact with the anchor plate 15 and a second coupler sheath joint 22 connected to the other end of the sheath main body 23. These members are each made of high-density polyethylene. And, it is milky white translucent.
The sheath main body 23 includes a cylindrical main body portion 23A, a male screw portion 20A formed integrally with the main body portion 23A, and a cylindrical portion 23D formed on the upper portion of the main body portion 23A.
In the second embodiment, a part of the small piece 3 is attached to the upper part of the inner wall surface 2 </ b> A of the sheath body 23 via the double-sided tape 30.

[Second Embodiment]
Next, the grout filling evaluation method of the second embodiment will be described.
A part of the small piece 3 is attached to the inner wall surface 2 </ b> A of the sheath body 23. For example, a double-sided tape 30 is used to attach the inner wall surface 2A of the small piece 3.
Thereafter, the second coupler sheath joint 22 is deeply screwed into the second PC steel material 12 with the end portion of the sheath body 23 screwed into the second coupler sheath joint 22. Then, the end portions of the first PC steel material 11 and the second PC steel material 12 are connected by the coupler 13, the second coupler sheath joint 22 is twisted back, and the other end opening of the sheath body 23 is brought into contact with the anchor plate 15. Join as appropriate. As a result, the sheath tube 4 is assembled.
The cylindrical portion 23D of the sheath body 23 faces upward, and the cylindrical portion 22D of the second coupler sheath joint 22 faces obliquely downward.

Then, the grout material G is filled into the sheath tube 4 from the cylindrical portion 22 </ b> D of the second coupler sheath joint 22. Then, the air inside the sheath tube 4 is discharged from the cylindrical portion 23D of the sheath body 23 to the outside.
When the liquid level of the grout material G rises inside the sheath tube 4 and the filling of the grout material G reaches a predetermined amount, the small piece 3 comes into close contact with the inner wall surface 2A of the sheath body 23 and is formed in the small piece 3B. Is visually recognized through the milky white translucent sheath body 23.

  Therefore, in 2nd Embodiment, there can exist an effect similar to (1) (2) (4)-(6) of 1st Embodiment.

The present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in each of the above embodiments, the example of evaluation in the case where the grout material G is filled in the sheath tubes 2 and 4 covering the PC steel material 1 including the first PC steel material 11, the second PC steel material 12, and the coupler 13 is applied. In the present invention, when the polyethylene sheaths 11B and 12B are formed of milky white translucent members, the present invention can also be applied to the case where the polyethylene sheaths 11B and 12B are filled with the grout material G.

Further, the sheath tubes 2 and 4 are made of high-density polyethylene, but the material of the sheath tubes 2 and 4 is not limited as long as it is translucent, and may be polypropylene, for example.
Moreover, the tape part 3A which comprises the small piece 3 will not be limited if the material has elasticity. For example, a synthetic resin other than polyethylene or a metal such as aluminum may be used.

  DESCRIPTION OF SYMBOLS 1 ... PC steel material, 11 ... 1st PC steel material, 11A ... 1st PC steel rod, 11B ... Polyethylene sheath, 11C ... Male thread part, 12 ... 2nd PC steel material, 12A ... 2nd PC steel rod, 12B ... Polyethylene sheath, DESCRIPTION OF SYMBOLS 13 ... Coupler, 14 ... Nut, 15 ... Anchor plate, 2, 4 ... Sheath tube, 20, 23-point sheath main body, 21 ... First coupler sheath joint, 22 ... Second coupler sheath joint, 3 ... Small piece (filling evaluation member) 30 ... Double-sided tape, 3A ... Tape part, 3B ... Color part, 3C ... Concave part, 3D ... Convex part, 3E ... Hole, G ... Grout material

Claims (5)

A method for evaluating the filling of a grout material into a translucent sheath tube in which a PC steel material is disposed,
Attaching a part of a small piece having a color that is elastic to the inner wall surface of the sheath tube and visible to the outside through the sheath tube when the whole adheres to the inner wall surface;
And a step of filling the inside of the sheath tube with the grout material. In the grout filling evaluation method according to claim 1,
The PC steel material includes a first PC steel material and a second PC steel material arranged in series, and a coupler for connecting the first PC steel material and the second PC steel material,
The sheath tube includes a sheath body that covers the coupler, and a coupler sheath joint that is connected to at least one end of the sheath body and covers at least one of the first PC steel material and the second PC steel material,
The coupler sheath joint is formed with a cylindrical portion for communicating the inside and outside of the sheath tube,
A method for evaluating the filling of a grout material, wherein a part of the small piece is attached to one inner wall surface of the coupler sheath joint and the sheath body. A member for evaluating the filling of a grout material used for evaluating the filling of the grout material into a translucent sheath tube in which the PC steel material is disposed,
It is a small piece that is partly attachable to the inner wall surface of the sheath tube and has elasticity, and the small piece has a color that can be visually recognized through the sheath tube when the whole piece is attached to the inner wall surface. A member for evaluating the filling of a grout material. In the grout material filling evaluation member according to claim 3,
The said small piece is formed in multiple numbers with the recessed part and the convex part located in a line. The member for filling evaluation of the grout material characterized by the above-mentioned. In the grout material filling evaluation member according to claim 3,
A plurality of holes penetrating in the thickness direction of the small piece are formed. A member for evaluating the filling of a grout material.

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