JPH023849B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an anchor rod used in civil engineering works such as construction and reinforcement of buildings or retaining walls.

(Prior art) We have filed a patent application as an anchor rod in 1982.
69986 (Special Publication No. 62-62207).

The structure of this invention is as follows: ``The peripheral wall of the anchor rod body made of a cylindrical body is provided with a roughly U-shaped cut with the base facing toward the rear end of the anchor rod body, and a roughly U-shaped cut with the base facing toward the tip of the anchor rod body. In addition to providing a letter-shaped cut and a substantially linear cut,
An anchor rod characterized in that a closing fitting is attached to the opening at the tip of the anchor rod body so that an expansion agent can be injected and accommodated from the opening at the rear end of the anchor rod body. ”.

(Problems to be Solved by the Invention) When the anchor rod according to the present invention is cast or buried in the ground, earth, sand and water enter the anchor rod body through each cut, and the swelling agent injected and filled into the anchor rod body expands. There were some problems that seemed to be hindering the effectiveness.

(Means for Solving the Problems) The anchor rod of the present invention has a plurality of cuts that form a substantially U-shape when the anchor rod body is stood upright, and a substantially inverted U-shape on the peripheral wall of the anchor rod body made of a cylindrical body. A plurality of cuts are provided in the anchor rod body, and a plurality of cuts are made in a substantially vertical straight line shape, a closing metal fitting is attached to the tip opening of the anchor rod body, and a heat-shrinkable tube is externally fitted and fixed to the peripheral wall of the anchor rod body. The above-mentioned cuts (substantially U-shaped, substantially inverted U-shaped, and substantially vertical straight cuts) formed in this peripheral wall are closed, and the swelling agent is injected and filled from the opening at the rear end of the anchor rod body thus made. It is designed to be transparent.

(Function) Heat shrinkability that closes each cut made in the peripheral wall of the anchor rod body (cuts that are approximately U-shaped when the anchor rod body is stood upright, cuts that are approximately inverted U-shaped, and cuts that are approximately vertically straight) The tube is externally fitted and fixed to the peripheral wall of the anchor rod body.

An expansion agent is injected and filled into the anchor rod body thus formed to form an enlarged portion and tongues opening upward and downward to increase pull-out resistance, supporting force, and frictional force. There is no dirt or water inside the anchor rod body, so it has good expansion efficiency.

(Example) Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an exploded overall perspective view showing one embodiment of the present invention. In the figure, reference numeral 1 denotes an anchor rod body made of a cylindrical body made of metal or synthetic resin. The peripheral wall of the anchor rod body 1 has a plurality of cuts 21 that are approximately inverted U-shaped when the anchor rod body 1 is stood upright, a plurality of notches 31 that are approximately U-shaped, and approximately vertically linear. A plurality of cuts 4 are provided. The cuts 21 form a plurality of tongue pieces 22 that open upward, and the cuts 31 form a plurality of tongue pieces 32 that open downward. 2 and 3 are cross-sectional views taken along lines aa and bb of FIG. 1, respectively.

On the other hand, 5 in FIG. 1 is a closing fitting, and the rear end 5
b is press-fitted and fixed into the tip opening 1a of the anchor rod body 1. By attaching the closing fitting 5 to the anchor rod body 1, soil is prevented from entering the anchor rod body 1 underground, and a storage chamber is created in which the expansion agent can be injected and filled from the rear end opening 1b of the anchor rod body 1. is formed. Note that the attachment of the closing fitting 5 to the tip opening 1a of the anchor rod main body 1 is not limited to that shown here. The closure fitting 5 is mainly used for pouring, and its tip 5a has a sharp shape.

Reference numeral 6 denotes a heat-shrinkable tube, which is externally fitted and fixed to the peripheral wall of the anchor rod body 1 so as to close each cut 21 . . . , 31 . . . , 4 . By externally fitting and fixing the heat-shrinkable tube 6 to the anchor rod main body 1 in this manner, it is possible to prevent dirt and water from entering the anchor rod main body 1 through the cuts 21 . . . , 31 . . . , 4 .
In this way, the anchor rod main body 1 and the closing fitting 5
Anchor rod A is constituted by the heat-shrinkable tube 6 and the heat-shrinkable tube 6.

In addition, when driving the anchor rod body 1 into the ground, the temperature of the heat-shrinkable tube 6 is approximately 70°C to 100°C.
The anchor rod body 1 is fitted onto the peripheral wall of the anchor rod body 1 by pouring boiling water on it, causing the anchor rod to shrink by heat, and then closing each of the above-mentioned cuts.

As explained above, in the above embodiment,
On the peripheral wall of the anchor rod main body 1, cuts 21, which have a substantially inverted U shape when the anchor rod main body 1 is stood upright, cuts 31, which have a substantially U shape, and cuts 4, which have a substantially vertical straight line shape are provided, It is extremely easy to manufacture because it is constructed by simply attaching the closing fitting 5 to the tip opening 1a and fitting and fixing the heat-shrinkable tube 6 that closes each of these cuts to the peripheral wall of the anchor rod body 1, making it inexpensive. becomes. Further, since the heat-shrinkable tube 6 is externally fitted and fixed, it is possible to completely prevent dirt and water from entering into the anchor rod body 1 through the cuts 21..., 31..., 4... in the ground. It can be effectively applied to soil formed from sediment with small particle size, as well as to soft soil with a high moisture content. After casting or burying at the site, if the expansion agent 10 is injected from the rear end opening 1b of the anchor rod main body 1, the expansion pressure causes the tongues 22..., 32... to open upwardly and erect downwardly. The anchor rod body 1 around it is enlarged, and the cut 4 is approximately vertically straight.
As the crack expands, the anchor rod body 1 around it expands. Therefore, the pulling resistance, supporting force and frictional force of the anchor rod A in the soil are significantly increased. Furthermore, as will be explained in detail below, it is only necessary to make cuts 21..., 31..., 4... in the peripheral wall of the anchor rod body 1 at the factory and then pour the cuts at the site. Since it is only necessary to drill a hole with a diameter approximately equal to the outside diameter, reinforcement work such as retaining walls can be done quickly and economically.

In the above embodiment, the anchor rod body 1 is made of a cylindrical body, but a hollow prismatic body may also be adopted. Further, the substantially U-shaped or substantially inverted U-shaped cut may also be, for example, a U-shape, a V-shape, a semicircle, or the like. Although the substantially vertical straight cuts 4 are provided parallel to the axis of the anchor rod body 1, they may be provided along the circumference of the anchor rod body. Further, although the cuts 21..., 31..., 4... are provided alternately along the hour direction of the anchor rod body 1, they may be provided alternately along the circumference. In that case, the cuts 21..., 31..., 4 may be provided substantially on the same line along the axial direction of the anchor rod main body 1. It is preferable that the number of each of these cuts is as large as possible as long as it does not significantly affect the strength of the anchor rod body, but it is preferable to provide them as close to the tip of the anchor rod body as possible, and it is sufficient to provide them at about 3 locations on the same circumference of the surrounding wall. It is.

In the above embodiment, the anchor rod main body 1 and the closing fitting 5 are separate members, but they may be formed integrally, or the tip opening 1a of the anchor rod main body 1 and the rear end 5b of the closing fitting 5 may be formed integrally. It is also possible to have a male and female threaded together. When burying, a closing metal fitting with a flat tip as shown in FIG. 4 may be used.

Further, in the above embodiment, the heat-shrinkable tube 6 made of vinyl chloride resin is used, but it may be made of nylon resin, polyester resin, polypropylene resin, or the like. However, chemical resistance,
In terms of water resistance, weather resistance, and physical strength, those made of vinyl chloride resin are preferred. For example, "Kopalon S-Tube" manufactured by Gunkore Koubun Kogyo Co., Ltd.
(Product name) is preferably used. The heat-shrinkable tube 6 is open at both ends, but the tip may be bottomed, especially when it is to be buried. The anchor rod body 1 may also be coated.

Hereinafter, by explaining an example of a method of reinforcing the retaining wall 7 that can be carried out by employing the anchor rod A of the above embodiment, the function of the anchor rod A of the present invention,
The effects will be explained in more detail.

First, heat-shrinkable tube 6 is poured with boiling water at about 80° C. to cause it to shrink, so that the heat-shrinkable tube 6 is fitted onto the peripheral wall of anchor rod body 1, and each cut is closed. Next, as shown in FIG. 5, a plurality of these anchor rods A are inserted into desired locations underground 9 at acute angles to the vertical axis of the retaining wall 7 through holes 8 bored at predetermined intervals in the retaining wall 7. Hit it deep. It is preferable that the anchor rod A is relatively short when driven into the upper part of the retaining wall 7, and becomes gradually longer towards the lower part. However, the method is not necessarily limited to this, and long anchor rods and short anchor rods may be driven alternately. Furthermore, if the ground is soft, it is preferable to use a long anchor rod. In this way, even if the anchor rod A is driven into the ground 9, the heat-shrinkable tube 6 prevents earth, sand, and moisture in the ground 9 from penetrating into the anchor rod body 1.

Each anchor rod A driven in this way...
The swelling agent 10 is applied to each cut 21 from the rear end opening 1b.
..., 31..., 4... are provided. This swelling agent is a mixture of an inorganic compound mainly composed of silicate, a specific organic compound, and water. For example, a mixture of "Blystar" (trade name) manufactured by Onoda Cement Co., Ltd. and water can be suitably used. Note that a mixture of this expanding agent with a small amount of cement, mortar, etc. may also be used.

The injected swelling agent 10 hardens enormously and reaches its maximum inflation pressure after about 12 to 24 hours, and as shown in FIG. 6, this inflation pressure causes the tongue pieces 22..., 32...
ruptures the heat-shrinkable tube 6 and stands up to open upwardly and downwardly, and as the cracks in the substantially linear cuts 4 expand, the surrounding area of the anchor rod body 1 expands (bulging portion 11...). The upwardly opening tongue pieces 22... and the downwardly opening tongue pieces 32... stand up to provide pull-out resistance and supporting force, and the enlarged portion 11 of the anchor rod body 1...
A frictional force is applied to the anchor rod A.
FIG. 7 is a partial perspective view of the anchor rod A showing a state in which the tongue pieces 22..., 32... are opened upwardly and downwardly, and the cuts 4... are cracked and enlarged, with the broken heat-shrinkable tube 6 omitted. Figures 8 and 9 show c- in Figure 7 with the swelling agent omitted, respectively.
They are a sectional view taken along the line c and a sectional view taken along the line dd.

The enlarged portion 11 of the anchor rod body 1 and the tongue piece 2
2..., 32... as the anchor rod body 1 rises
Due to the enormous size of the surrounding area (voluminous part 12...),
Compressive stress is applied to the soil layer around anchor rods A and consolidation occurs. As a result, a large frictional force is generated between the anchor rod A and the underground 9, and the pull-out resistance of the anchor rod A becomes extremely high.

After the expansion of the expansion agent 10 is completed, a closing fitting is attached to the upper end opening of each anchor rod A protruding from the retaining wall 7, and each anchor rod A engaged with the retaining wall 7 is tightened using a fastening means such as a nut. Grant. By applying tension in this manner, the pull-out resistance and supporting force of the anchor rods A become larger.

As described above, the reinforcement of the retaining wall employing the above embodiment of the anchor rod of the present invention is completed.

In addition, if the rear end of each anchor rod A is undesirably exposed from the retaining wall 7, it is preferable to bury that part with concrete.

(Effect of the invention) An expansion agent is injected and filled into the anchor rod body driven into the ground to form an enlarged portion and a tongue piece that opens up and down on the peripheral wall of the anchor rod body, thereby increasing the anchor rod's pull-out resistance and supporting force. Frictional force can be increased. A heat-shrinkable tube that closes each incision is fitted onto the peripheral wall of the anchor rod body, which prevents dirt and water from entering the anchor rod body and inhibiting the expansion efficiency of the expansion agent. . The straight pipe-shaped anchor rod body is simply driven or buried in the ground and the expansion agent is injected and filled, so construction is easy and many construction machines are not required. The anchor rod body can be mass-produced in a factory, and it is economical because it is easy to construct, and it can be constructed easily and quickly with little noise even in areas where houses and facilities are crowded.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
2 is a cross-sectional view taken along the line a-a of FIG. 1, FIG. 3 is a cross-sectional view taken along the line bb-b of FIG. The figure is a partial cross-sectional view showing the state in which the anchor rod of the present invention has penetrated a hole provided in a retaining wall and is driven into the ground. Figure 6 shows a tongue piece breaking a heat-shrinkable tube and standing up in the ground. In addition, a partial cross-sectional view showing a state in which the cut has enlarged the crack and the surrounding area has expanded, and FIG. A perspective view of the main part with the heat-shrinkable tube omitted;
FIG. 9 is a cross-sectional view taken along the line dd--c of FIG. 7, with the expansion agent omitted. A... Anchor rod, 1... Anchor rod body, 21, 31, 4... Cut, 22, 32...
tongue piece, 5... closing fitting, 6... heat shrinkable tube, 7... retaining wall, 9... underground, 10... expanding agent,
11, 12... Ampulla.

Claims (1)

[Claims] 1. On the peripheral wall of the anchor rod body made of a cylindrical body, there are a plurality of cuts that are approximately U-shaped when the anchor rod body is stood upright, a plurality of cuts that are approximately inverted U-shaped, and approximately vertically linear. A plurality of cuts (approximately U 1. An anchor rod characterized in that the anchor rod has a structure in which the opening of the anchor rod body is injected and filled with an expansion agent through the opening at the rear end of the anchor rod body.