JPH0340767B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for preventing rust of a head fixing portion of an anchor for burial in the ground, and particularly to a construction method that facilitates the construction.

[Prior Art] It has been widely practiced to prevent the collapse of the ground such as a slope by fixing a concrete plate or the like to the surface of the ground such as a slope using an anchor.

A conventional example is shown in Fig. 1. In order to prevent the collapse of the ground, for example, a slope, when fixing a concrete plate 1 to the slope with an anchor, a hole 2 for burying the anchor is bored, and the inside of the hole 2 is One or more tensile steel members 3 are inserted into and fixed with a pouring material, such as cement mortar 4. The tensile steel material 3 is coated with a water stop material 5 and passed through a synthetic resin pipe, for example, a polyethylene pipe 6, and the tip of the tensile steel material 3 coming out of the polyethylene pipe 6 is fixed to an anchor head 7. A plate 8 called a bearing plate is interposed between the anchor head 7 and the concrete plate 1, and the anchor head 7 is covered with an oil cap 9. Then, a steel pipe 10 called a trumpet pipe is covered to prevent rust on the exposed portion 3a of the tensile steel material, and a packing 11 is applied between the trumpet pipe 10 and the polyethylene pipe 6, and a rust preventive material such as oil is applied. Enter 12. Also, a rust preventive material 12 is placed inside the cap 9.

[Problems to be Solved by the Invention] Such conventional anchors have the following problems. A rust preventive material 12 is placed inside the trumpet pipe 10 to prevent the exposed portion 3a of the tensile steel material from rusting.In order to hold the rust preventive material 12 inside the trumpet pipe 10, a separately prepared packing 11 is inserted into the polyethylene pipe 6. It had to be installed between the trumpet pipe 10 and the trumpet pipe 10, and it took a long time to install.
Also, the oil cap 9 is attached to the anchor head 7 by screwing, etc.
A gap is inevitably created between the trumpet pipe 10 and the bearing plate 8, and while the above-mentioned packing 11 ensures a reliable seal, rainwater or the like enters the trumpet pipe 10 through the gap, causing rust on the exposed portion 3a of the tensile steel material. This will reduce the life of the anchor.

The present invention was made to solve the above-mentioned conventional problems, and its purpose is to apply a separately prepared packing to seal between a synthetic resin pipe (polyethylene pipe) and a trumpet pipe. According to the present invention, in addition to the outer trumpet pipe used in the conventional anchor burying method, an inner trumpet pipe in which a synthetic resin pipe is sandwiched between the outer trumpet pipe and the outer trumpet pipe is used. This makes it easier to insert the inner trumpet pipe into the synthetic resin pipe, and also allows rainwater to escape from the gap between the oil cap and the bearing plate, and the pipe covers the tensile steel material (synthetic resin pipe and inner trumpet pipe).
To provide a rust prevention method for a head fixing part of an anchor for burial in the ground, which does not cause the inconvenience of shortening the life of the anchor by rusting the tensile steel material.

[Means for Solving the Problems] Therefore, according to the present invention, as shown in FIGS. 2 to 7, an inner trumpet pipe 14 is used in addition to the outer trumpet pipe 10 used in the conventional construction method, and the inner and outer trumpet pipes are pet pipe 14,1
A synthetic resin pipe 6 such as a polyethylene pipe is sandwiched between the inner and outer trumpet pipes 14 and 1.
A quick-drying adhesive 15 is filled between the holes and sealed. Further, when inserting the inner trumpet pipe 14 into the synthetic resin pipe 6, the pushing force due to the weight of the jack 17 or the like is used to pull the tension steel material 3.

Moreover, in addition to the large diameter bearing plate 8, a small diameter plate 13 is used, and the small diameter plate 13
By welding the ends of the outer trumpet pipe 10 to prevent it from entering.

[Operations and Effects of the Invention] According to the present invention, the synthetic resin pipe 6 is sandwiched between the inner trumpet pipe 14 and the outer trumpet pipe 10, and the adhesive 15 is filled between them to seal the pipe. It is not necessary to insert a separately prepared sealing material made of rubber or the like between the synthetic resin pipe and the trumpet pipe, improving workability and ensuring reliable sealing.

Further, in the method of the present invention, an inner trumpet pipe 14 is used in addition to the outer trumpet pipe 10,
It is necessary to insert the inner trumpet pipe 14 into the synthetic resin pipe 6, but this operation is performed using the weight of the jack 17 that pulls the tension steel material 3 and its pushing force, so the inner trumpet pipe 14 can be inserted with ease. The pipe 14 can be inserted into the synthetic resin pipe 6.

Furthermore, by welding the end of the outer trumpet pipe 10 to the small diameter plate 13, rainwater that enters through the gap between the small diameter plate 13 and the bearing plate 8 can be prevented from entering the inner trumpet pipe 14 and the synthetic resin pipe 6. Because it prevents
It is possible to prevent the tensile steel material 3 from rusting due to rainwater and extend the life of the anchor.

[Example] Hereinafter, an example in which the method of the present invention was implemented will be described with reference to FIGS. 2 to 7.

Drill a hole 2 of an appropriate diameter in the ground to an appropriate depth,
A tensile steel material 3 and a synthetic resin pipe, such as a polyethylene pipe 6, placed on the outside of the tensile steel material 3 are inserted into the hole 2, and a pouring material, such as cement mortar 4, is filled between the inner wall of the hole 2 and the outer wall of the polyethylene pipe 6. Then, the tensile steel member 3 is fixed in the hole 2 with cement mortar 4 (FIG. 2).

A large diameter bearing plate 8 having a hole 8a in the center is placed at the entrance of the hole 2 drilled in the ground,
On the outer surface of the bearing plate 8, a small diameter plate 13 having a hole 13a in the center, a tapered screw 13b formed on the outer periphery, and an outer trumpet pipe 10 welded near the hole 13a in the center is attached to the outside. The trumpet pipe 10 is placed over the outside of the polyethylene pipe 6, and a rust preventive material 12 such as oil is placed inside the outside trumpet pipe 10 and the polyethylene pipe 6 (FIG. 3).

An inner trumpet pipe 14 is passed through the outside of the tensile steel member 3, the tip of the inner trumpet pipe 14 is inserted into the polyethylene pipe 6, and a fast-acting adhesive 15 is placed between the inner and outer trumpet pipes 14 and 10. The tensile steel material 3 is passed through the wedge hole 7a of the anchor head 7, and the anchor head 7 is brought into contact with one end of the inner trumpet pipe 14 (FIG. 4).

A wedge 16 is inserted into the wedge hole 7a of the anchor head 7.
and then set the jack 17 (Fig. 5).

The inner trumpet pipe 14 is pushed into the polyethylene pipe 6 using the weight of the jack 17, and the jack 17 is operated to pull the tension steel member 3 (FIG. 6).

Remove the jack 17 (Figure 7).

The portion of the tensile steel material 3 exposed through the hole 2 drilled in the ground is cut as necessary, leaving an appropriate length.
An oil cap 9 containing a rust preventive material 12 is screwed into a tapered screw 13b formed on the outer periphery of the small diameter plate 13, and the exposed portion of the tensile steel material 3 and the anchor head 7 are covered with the cap 9 (FIG. 8).

According to the method of the present invention, the synthetic resin pipe 6 is sandwiched between the inner and outer pipes 14 and 10, and the adhesive 15 is filled between them to seal the pipe, and the synthetic resin pipe and the trumpet pipe are sealed as in the conventional method. There is no need to insert a separately prepared sealing material made of rubber or the like between the two, improving workability and ensuring reliable sealing. Since the inner trumpet pipe 14 is inserted into the synthetic resin pipe 6 using the pushing force generated by the weight of the jack 17 that pulls the tension steel material 3, the inner trumpet pipe 14 can be inserted into the synthetic resin pipe with good work efficiency. It can be inserted into 6.

Furthermore, in the method of the present invention, by welding the end of the outer trumpet pipe 10 to the small diameter plate 13, the small diameter plate 13 and the bearing plate 8 are welded to each other.
This prevents rainwater from entering the inner trumpet pipe 14 and the synthetic resin pipe 6 through the gap between the anchors, thereby preventing the tensile steel material 3 from rusting due to rainwater and extending the life of the anchor. .

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view showing a conventional underground anchor buried in the ground, Figures 2, 3, 4, 5, 6, 7, and 8 are FIG. 3 is a process chart showing, in longitudinal section, the process of burying the ground-embedding anchor in the ground according to the method of the present invention. 2... Hole drilled in the ground, 3... Tensile steel material, 4
...Injection material, 6...Polyethylene pipe, 7...
Anchor head, 8...Bearing plate, 9
...Oil cap, 10...Outer trumpet pipe, 12...Rust preventive material, 13...Small diameter plate, 14...Inner trumpet pipe, 15...
Adhesive, 16... wedge, 17... jack.

Claims (1)

[Scope of Claims] 1. A method for preventing rust of a head fixing portion of an anchor for burial in the ground, characterized by comprising the following steps: (b) Drill a hole of an appropriate diameter to an appropriate depth in the ground;
A tensile steel material and a synthetic resin pipe applied to the outside of the tensile steel material are inserted into the hole, and the hole is filled with injection material to fix the tensile steel material within the hole with the injection material. (b) A large-diameter bearing plate with a hole in the center is placed at the entrance of a hole drilled in the ground, and a tapered screw with a hole in the center and a tapered screw is formed on the outer surface of the bearing plate. A small diameter plate with an outer trumpet pipe welded near the hole in the center is placed so that the outer trumpet pipe covers the outside of the synthetic resin pipe, and the outer trumpet pipe and the inside of the synthetic resin pipe are Add anti-rust material to. (c) Pass the inner trumpet pipe on the outside of the tensile steel material, insert the tip of the inner trumpet pipe into the synthetic resin pipe, fill the space between the inner and outer trumpet pipes with adhesive, and attach the tensile steel material. Pass it through the wedge hole in the anchor head and place the anchor head against the end of the inner trumpet pipe. (d) Set the wedge in the wedge hole of the anchor head, and also set the jack. (E) Push the inner trumpet pipe into the synthetic resin pipe using the pushing force of the jack's own weight, and then operate the jack to pull the tension steel material. (f) Remove the jack. (g) Cut the exposed part of the tensile steel material through the hole drilled into the ground, leaving an appropriate length as necessary;
An oil cap containing a rust preventive material is screwed into a tapered screw formed on the outer periphery of the small diameter plate, and the exposed portion of the tensile steel material and the anchor head are covered with the cap.