JPH111929A - Method for forming grout for reinforcing steel bar to be penetrated through precast board for retaining wall, and grout injection guide therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a grout for a reinforcing steel bar for supporting a precast board stably at a cut slope by a method wherein a cavity can be prevented from being formed with the grout filled up to the mouth of the precast board. SOLUTION: A concrete precast board 2 is arranged at the surface of a cut slope 4 and a bottomless cylindrical injection guide 1 is provided in projection at the opening at the cut slope of a grout hole 3 drilled to the ground, and thereby the grout hole 3 is extended, being surrounded by the injection guide, to a position where a reinforcing steel bar 5 is attached to the arranged precast board 2, and the reinforcing steel bar 5 is inserted, penetrating through the cylindrical injection guide, into the grout hole 3. Then, grout 6 is injected from the opening side of the injection guide 1 into the grout hole 3, and filling with the grout 6 is made to the position where the reinforcing steel bar 5 is attached to the precast board 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grout for a reinforcing steel rod which communicates with a precast plate for a retaining wall so that the precast plate for a retaining wall can be securely held on a cut slope or the like via a reinforcing steel rod and a grout. The present invention relates to a forming method and a grout material injection guide used for the method.

[0002]

2. Description of the Related Art Conventionally, in a method of reinforcing earth on a cut slope or the like, as shown in FIG. 4, a concrete precast plate P is vertically and horizontally connected to an inclined surface to form a retaining wall. I was In this case, a reinforcing steel rod Pa having one end fixed to each precast plate P is inserted into a grout hole G drilled from the cut end face to the ground side, and grout is injected into the grout hole to reinforce the ground. By fixing the steel rod, the precast plate P was stably arranged.

[0003] However, the grout hole G is usually inclined, so that the injected grout material is as shown in FIG.
A cavity Ga is formed in the opening. In particular, since a gap H for mortar bonding is secured between the cut slope and the precast plate P, even if an extra grout material is injected into the grout hole G, it flows out and cannot be filled in the hollow portion Ga. For this reason, if left unchecked, it will cause collapse near the cavity or cause corrosion of the reinforcing steel rod, making it impossible to stabilize the precast plate. This required a step of filling. Even when mortar is injected into the gap H between the cut slope and the precast plate P, the cavity Ga of the grout hole G is not filled.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a grout for reinforcing steel rods in which a grout material can be filled up to the mouth of the precast plate by injecting it into a grout hole and a precast plate can be stably held without forming a cavity. It is intended to provide a forming method and a grout injection guide used for the method.

[0005]

For this reason, the method for forming grout for reinforcing steel rods of the present invention comprises placing a concrete precast plate on a cut slope or the like, and grouting the grout hole drilled from the cut end face toward the ground. In the reinforced earth method in which one end of the reinforcing steel rod fixed by material injection is attached to a precast plate and the cut slope is covered with the precast plate, a bottomless cylindrical guide is provided at the cut slope opening of the grout hole. By projecting, the grout hole is extended to the mounting portion of the reinforcing steel bar in the arranged precast plate, surrounding the grout hole, and the reinforcing steel bar is inserted into the cylindrical guide, and is inserted into the grout hole. Is injected into the grout hole from the open side of the cylindrical guide, and the grout material is filled up to the mounting portion of the reinforcing steel bar in the precast plate. Further, the grout material injection guide of the present invention is inserted into an insertion hole of an attachment member for attaching one end of a reinforcing steel rod for arranging a grout hole fixed to a precut plate for arranging a cut slope, and is substantially equivalent to the grout hole. With the same hole diameter and a hole diameter that can be inserted into the insertion hole of the mounting member,
A tubular portion having a length such that the tip can be inserted into the grout hole,
A flange protruding from one end of the tubular portion and engaging with the mounting member.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the illustrated embodiment of a grout material injection guide. FIG. 1 illustrates a state in which the grout material injection guide 1 of the present embodiment is inserted into a mounting plate 21 of a concrete precast plate 2.

The grout material injection guide 1 has a cylindrical portion 1 having substantially the same diameter as the grout hole 3 shown in FIG. 2 and having a hole diameter that can be inserted into the circular insertion hole 210 of the mounting plate 21.
A flange 11 protrudes from the rear end edge of the outer periphery 0 toward the outer periphery, and is integrally formed of plastic. In addition, the length of the cylindrical part 10 is a state in which the precast plate 2 is arranged,
The length is slightly longer than the distance from the mounting plate 21 to the grout hole 3.

Next, the operation will be described.
Then, the precast plate 2 is disposed with a slight gap H, and the grout hole 3 is formed in the ground through the insertion hole 210 of the mounting plate 21. Then, the cylindrical portion 10 is inserted through the insertion hole 210 of the mounting plate 21 to lock the flange 11 with the mounting plate 21, and the distal end of the cylindrical portion 10 is inserted into the grout hole 3 to insert the injection guide 1. Hold.

As a result, a hole formed by the tubular portion 10 is formed up to the mounting plate 21 continuously from the grout hole 3. That is, the grout hole 3 is extended by the injection guide 1 to the mounting plate 21 of the precast plate 2.

After the injection guide 1 is inserted, the reinforcing steel rod 5 is inserted from the injection guide 1 into the grout hole 3, and then the grout material 6 is injected from the injection guide 1 into the grout hole 3 as shown in FIG. 3, the end of the reinforcing steel rod 5 is attached to the mounting nut 7.
It sticks with.

Thereafter, the cap 8 for closing the mounting nut 7 is fixed via the mortar, and the mortar 9 is injected into the gap H between the cut slope 4 to hold the precast plate 2.

According to the present embodiment, the grout hole 3 can be completely filled with the grout material 6 by arranging the injection guide 1, and most of the inside of the injection guide 1 can also be filled with the grout material 6. For this reason, the reinforcing steel rod 5 can be secured and secured, and the precast plate 2 can be stably held. In addition, a grout can be formed that does not induce collapse of the hollow portion because no hollow portion is formed in the ground.

Although a hollow portion without the grout material 6 is formed slightly on the open side in the injection guide 1, the hollow portion is filled when the mounting nut 7 is fixed or after the mortar material is injected again. This re-injection is also a cavity in the injection guide 1 and is simpler than the conventional one. Or grout 6
If the mounting nut is closed immediately after filling, no cavity is formed. In any case, there is no problem even if some of the cavities are left as they are not cavities in the ground.

Although the present embodiment is configured as described above, the present invention is not limited to this. For example, in the grout forming method, the holding means of the cylindrical guide for surrounding and extending the grout hole to the mounting portion of the reinforcing steel bar in the arranged precast plate is not limited. In the grout injection guide, the shape of the cylindrical portion and the shape of the flange engaged with the mounting plate are not limited. Further, the configuration of the precast plate and the shape and configuration of the mounting member for mounting the reinforcing steel bar are also arbitrary. The type of the grout material is appropriate, and a material obtained by mixing a mortar with a curing agent or the like may be used.

[0015]

According to the first aspect of the present invention, since the grout hole is extended to the reinforcing steel rod mounting portion of the precast plate and the grout material can be filled, the reinforcing steel bar can be secured and the precast plate can be stably held. In addition, a grout can be formed that does not induce collapse of the cavity because no cavity is formed in the ground. According to the second aspect of the present invention, since the grout hole can be easily extended to the mouth of the precast plate by inserting the grout material injection guide, the reinforcing steel rod can be fixed and secured by filling the grout material, and the precast plate can be stably held. In addition, since no hollow portion is formed in the ground, the collapse of the portion can be prevented.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part in which a grout material injection guide according to one embodiment of the present invention is inserted into a precast plate.

FIG. 2 is a vertical sectional view of a main part in a state in which a grout material is injected with a grout material injection guide attached.

FIG. 3 is an enlarged vertical sectional view of a main part thereof.

FIG. 4 is a longitudinal sectional view of an essential part showing a retaining wall state of a cut slope.

FIG. 5 is an enlarged vertical sectional view of a main part showing a conventional method.

[Explanation of symbols]

 Reference Signs List 1 grout material injection guide 10 cylindrical portion 11 flange 2 precast plate 21 mounting plate 210 insertion hole 3 grout hole 4 cut slope 5 reinforcing steel bar 6 grout material 7 mounting nut 8 cap 9 mortar

Claims (2)

[Claims] 1. A concrete precast plate is placed on a cut slope or the like, and one end of the reinforcing steel rod 5 fixed by pouring a grout material 6 into a grout hole 3 drilled from a cut end face 4 to the ground side. In the reinforced earth method in which the cut slope 4 is attached to the precast plate 2 and the cut slope 4 is covered with the precast plate 2, a bottomless cylindrical guide is disposed so as to protrude from the cut slope opening of the grout hole 3. After extending around the grout hole 3 to the mounting portion of the reinforcing steel bar 5 in the precast plate 2, the reinforcing steel bar 5 is inserted into the cylindrical guide and inserted into the grout hole 3, and then the grout material 6 is inserted into the cylinder. The reinforcing steel rod 5 in the precast plate 2 is injected into the grout hole 3 from the open side of the cylindrical guide.
The grout material 6 can be filled up to the mounting portion of the above, wherein the grout forming method for a reinforcing steel rod is communicated with the retaining wall precast plate. 2. A grout hole arranging reinforcing steel rod 5 fixed to the cutting slope arranging precast plate 2 is inserted into an insertion hole of an attachment member to which one end of the grout hole arranging steel bar 5 is attached. A cylindrical portion 10 having a hole diameter that can be inserted into the insertion hole of the mounting member and having a length that allows the tip to be inserted into the grout hole 3; and a flange 11 that protrudes from one end of the cylindrical portion and engages with the mounting member. And a grout material injection guide.