JPH0412771B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to the head of a ground anchor that is buried beneath a building for the purpose of preventing it from floating due to water pressure, etc., or from falling due to earthquakes or wind. The present invention relates to a water-stopping structure for a ground anchor head anchorage part in which a waterstop treatment is applied to the anchorage part in a building frame.

[Problem to be solved by the invention] A ground anchor is buried in the ground below a building, and the prestressing steel material connected to it is tensed to prevent the building from falling or floating due to earthquakes, water pressure, etc. When attempting to stabilize the prestressing steel, there is a risk that water may seep upward along the prestressing steel, so it is necessary to provide a water stop at the anchorage.

By the way, the PC steel materials that are the object of the present invention are protected against rust and corrosion, such as by surrounding each steel piece with grease and a sheath, or by coating it with a resin.

Conventionally, a box-shaped opening was provided below the anchor plate and anchor disk for fixing the PC steel on the upper surface of the structural frame, a water-stop case was placed here, and a sealant, etc. was filled between the lower surface and the frame to stop water. However, in this structure, the prestress force introduced into the prestressing steel material is resisted by the bending moment of the anchor plate and anchor disk, so both members are of high strength and large cross section. In addition, there are drawbacks such as difficulty in construction because the water-stopping structure is formed below the anchoring part.

This invention was made based on the actual situation of the conventional water-stopping structure, and aims to form a simple water-stopping structure by applying waterstop to the anchor plate to which the prestressing steel material is fixed.

[Means for solving problems]

In the present invention, water stop rubber is fitted into the anchor plate and compressed by a template and an anchor disk, thereby simplifying the water stop structure and rationalizing the design.

The insertion hole through which the PC steel material of the anchor plate is inserted is provided with a tapered opening, that is, an inverted truncated conical shape, on the upper surface side, and a waterproof rubber is fitted around the PC steel material in this opening.

The template and the anchor disk are stacked on the anchor plate with the members in close contact with each other, and the water stop rubber is pressed and restrained on the anchor plate and the template to form a water stop structure on the frame.

The surrounding surface of the PC steel material under this water-stopping structure, that is, under the anchor plate, is filled with high-strength grout material.
As a result, the prestress stress introduced into the prestressing steel material can be resisted by the reaction force of the solidified high-strength grout material, so the stress burden on the anchor plate and anchor disk is small, and they can be easily fixed by simply transmitting compression. It suffices if it has a stress transmission function,
This means that a material with low strength and a small cross section will suffice.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment.

The water-stopping structure of the present invention is obtained by applying water-stopping treatment to the anchoring portion A of the building frame B of the PC steel material 2 connected to the ground anchor 1.

Figure 1 shows an example of installing the ground anchor 1.

At the head of the ground anchor 1, that is, the anchoring part A of the prestressed steel material 2, the prestressed steel material 2 is attached to the anchor plate 3, template 4,
It is fixed by stacking the anchor disks 5.

3 and 4 show the anchor plate 3 and anchor disk 5, respectively.

A tapered opening 3a' expanding upward is formed in the insertion hole 3a of the anchor plate 3, into which a ring-shaped water stop rubber 6 whose inner surface has liquid irregularities as shown in FIG. 5 is fitted.

Also, on the bottom surface of the anchor plate 3, there is a frame B.
A pipe 7 that partitions the prestressed steel material 2 through the insertion portion is joined, and the inside of this pipe 7 is filled with grout material 8. However, this construction may be omitted depending on the construction procedure, such as setting the prestressing steel material 2 before building frame B.

As shown in FIG. 4, the insertion holes 5a of the anchor disk 5 are tapered from the top side and the bottom side, respectively, and an embedded grip 9 for fixing the PC steel material 2 is embedded in the top side, and the bottom side will be described later. It becomes an oil reservoir for rust prevention oil.

The water stop structure uses this oil reservoir so that in the unlikely event that water seeps up from the water stop rubber, the water will be trapped in the oil reservoir due to the pressure difference between the top and bottom and the difference in specific gravity of oil and water.

The anchor plate 3 and the anchor disk 5 having the above shapes are stacked with the template 4 interposed between them, and the members are brought into close contact with each other, and the water stop rubber 6 is pressed onto the anchor plate 3 and the template 4 to form a water stop structure. .

By the way, the end of the sheath 2a of the PC steel material 2 is located halfway below the embedded grip 9 of the anchor disk 5 when the anchor plates 3 etc. are stacked as shown in the figure, and the water stop rubber 6 is located around the sheath 2a of the opening 3a'. embedded in.

A water stop cap 10 is placed on the outside of the water stop structure as shown in FIG. 2, and anticorrosion oil is poured into the inside of the cap 10 to apply rust prevention treatment to the water stop structure.

〔Effect of the invention〕

This invention is as described above, and the structure is simplified because the water-stopping structure is formed by simply stacking the anchor plates on the building frame.In particular, the water-stopping rubber can be attached by simply inserting it from above, making it easier to install. is good. Furthermore, when the water stop rubber fitted into the anchor plate is compressed from above by the template, it is restrained in all directions since it is made of steel, and the PC steel wire is restrained from the surroundings, increasing the water stop effect.

Further, since the template 4 is automatically compressed by tensioning the PC steel material, there is no need for special tightening bolts or the like.

In addition, the shape of the water stop rubber is that the inner surface is liquid-like unevenness.
The water-stopping rubber is in linear contact with the PC steel material and holds it down, so it has a high water-stopping effect.

In addition, since the grout material is filled under the anchor plate, it directly resists the tensile force of the prestressing steel material, and the stress burden on the anchor plate, anchor disk, etc. is small. It is possible to reduce costs by using only one item.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the installed state of the ground anchor, Fig. 2 is a sectional view showing an embodiment of the present invention, and Figs. 3 and 4 show an anchor plate and an anchor disk, respectively. , is a cross-sectional view,
5 is a plan view, and FIG. 5 is a sectional view showing the water stop rubber. A... Anchoring part, B... Frame, 1... Ground anchor, 2... PC steel material, 2a... Sheath, 3... Anchor plate, 3a... Insertion hole, 3a'... Opening, 4... Template , 5... anchor disk, 5a... insertion hole, 6... water stop rubber, 7... pipe, 8... grout material, 9... embedded grip, 10... water stop cap.

Claims (1)

[Claims] 1. The PC steel material connected to the ground anchor buried underground under the building is inserted into the anchor plates, templates, and anchor disks, which each have an insertion hole and are stacked one after another from the bottom, and is fixed to the building frame. This is a water-stopping structure for the anchoring part of the PC steel material, in which the insertion hole of the anchor plate is provided with a tapered opening that spreads toward the upper surface side, and a ring-shaped water-stopping rubber whose inner surface is wavy and uneven is provided around the opening of the PC steel material. A water-stopping structure for a ground anchor head fixing part, which is formed by fitting a template and an anchor disk onto an anchor plate with their members in close contact with each other, and pressing and restraining water-stopping rubber onto the anchor plate and template.