JPS5858325A - Anchor rod - Google Patents

Abstract

PURPOSE:To raise the drawing resistance of anchor rods by a method in which an anchor rod having u-shaped notches on its outer tube wall and a closing metal on its tip end opening is covered with a heat-shrink tube and penetrated underground, and an expandible material is injected through the aperture between the outer and inner tubes of the rod. CONSTITUTION:An anchor rod A covered with a heat-shrink tube 8 is driven through its closing metal 7 into a banking 11, and an expandible material 12 is injected through the aperture 4 between the outer and inner tubes 2 and 3 of the rod A until it reaches the positions of notches 5. The expandible material 12 injected expands and hardens to produce a maximum expansion pressure after the lapse of about 12-24hrs, whereby u-shaped tongue pieces 6 break the heat- shrink tube 8 and erect. By this, a drawing resistance is given to the anchor rod A.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anchor rod used in construction or civil engineering work. In particular, the construction of retaining walls to prevent the collapse of steps of various sizes formed on the land, such as cliffs, embankments, or river embankments, is also used for reinforcing anchor rods.

As this kind of anchor rod, one is provided in which the tip is enlarged in order to provide resistance to being pulled out from the ground. These anchor rods (17) are usually manufactured at the construction site.For example, a driving head is fixed to the tip, and a locking piece that can be opened and closed by rotating is attached to this driving head. The anchor rod body consists of multiple fixed steel rods or steel vibrators,
The anchor rod is inserted into a pre-drilled hole in embankment or cutting, and then the anchor rod body is rotated to excavate the surrounding soil layer from the expanded locking piece 1.
By injecting mortar, concrete, synthetic resin, etc. into the drilled hole to form a lump at the tip of the anchor rod body, an anchor rod having pull-out resistance was constructed.

□However, conventional anchor rods manufactured in this manner have the disadvantage that the lumpy body at the tip tends to be eccentric with respect to its axis. In addition, in order to form a lump at the tip, a hole with a larger diameter than the pre-drilled hole must be drilled at the tip (this requires two excavators, or Other construction machinery such as a rotor 19 was required, and moreover, it required some ingenuity to dispose of the soil generated from the re-excavation process.As a result, conventional anchor rods were expensive. Problems in the manufacturing of conventional anchor rods such as the Since it was necessary to drill relatively large diameter holes, it was necessary to construct retaining walls for embankments or cuttings where the ground was soft.Also, in addition to large excavators, Since other machinery such as a means of rotating the anchor rod was required, moving the machinery would impair work efficiency, and a relatively large pongee work area was required. This not only increased the number of days and costs required for construction, but also posed the problem of difficulty in construction work in areas where people's homes and facilities were concentrated.

Therefore, the inventor of the present invention went ahead and improved the above-mentioned conventional drawbacks,
In addition, in order to solve the problems of the conventional method, we proposed an anchor rod that can be manufactured very easily and has extremely high resistance to being pulled out from the ground (Japanese Patent Application No. 5-9/23/1972).

The present invention relates to improvements over the prior inventions of the inventors mentioned above. In other words, when the width of the cut made on the peripheral wall of the anchor rod body is wide, when the grain size of the earth and sand forming the embankment or cut is small, or when the moisture content of the loose embankment or cut is high, etc. This solves the problem that when anchor rods are placed in embankments, cuttings, or buried with Li, earth, sand, water, etc. can enter the anchor rod body through the cuts, inhibiting the expansion effect of the injected expansion agent. Therefore, the present invention aims to provide an anchor rod in which a heat-shrinkable tube is externally fitted onto the anchor rod body. A substantially U-shaped cut with the base facing the rear end of the anchor rod body is provided in the peripheral wall of the outer tube of the anchor rod body, and a closing fitting is attached to the tip opening G of the anchor rod body to close the rear end of the anchor rod body. From the opening,
The gap formed between the outer tube and the inner tube (this is a space in which an expansion agent or the like can be injected and accommodated) is heat shrinkable Y1;
The present invention is characterized in that the tube is fitted onto the anchor rod body so as to cover the cut.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an exploded overall perspective view showing an example of the present invention. In the figure, (1) is the anchor rod body, which is composed of an IA tube (2) and an inner tube (3), which are cylindrical bodies made of metal or synthetic resin. Between the lA tube (2) and the inner tube (3) -
A gap (4) of a constant width is formed here. A plurality of U-shaped cuts (5) whose bases face the rear end of the anchor rod body (1) are fixedly provided on the peripheral wall of the outer tube (2) of the anchor rod body (1). These cuts (5)
... forms a U-shaped tongue piece (6). FIG. 2 is a sectional view taken along the line X--X in FIG. 1. On the other hand, womb/
In the figure, (7) is a closure fitting, the end (7c) of which is connected to the tip opening (3a) of the inner tube (3) of the anchor rod main body (1), and the center part (7b) of the anchor rod main body (1). outside/
if (2+'s tip opening (2a) & here are press-fitted and fixed, respectively.

By attaching one blockage fitting (7) to the anchor rod body (1), the anchor rod body (1) in the ground is closed.
), and a storage chamber is formed into the gap (4) between the outer tube (21 and the inner tube (3)) in which a swelling agent or the like can be injected and accommodated. 7) is for pouring, and the tip (7a) has a sharp shape. (
81&j heat-shrinkable vinyl chloride tube, and its inner diameter is slightly larger than the outer diameter of the anchor rod body (]). This tube (8) is connected to the anchor rod body (1
) Fit the anchor rod body (1) on the outside so as to completely cover the cut (5) made in the peripheral wall of the outer tube (2).

From there, in the ground, there are cuts in earth, sand, water, etc. (5)
... is completely prevented from entering the anchor rod body (1).

In this way, the anchor rod body (1) and the closing fitting (7
) and a heat-shrinkable cyclized vinyl tube (8) constitute an anchor rod (A). When pouring into embankments, cuttings, etc., the tube (8) should be approximately 70"C-OoC.
Pour boiling water over it, heat it for 1 hour, and then attach the anchor rod body (
]).

As explained above, in this example, the solid wall of the outer tube (2) of the anchor rod body (1) is provided with an opening-shaped cut (5), Since it is constructed by simply attaching the closing fitting (7) and fitting the heat-shrinkable tube (8) on the outside, manufacturing is extremely easy and therefore inexpensive.

In addition, the heat-shrinkable tube (8) completely prevents dirt, water, etc. from entering the ground through the cuts (5) of the anchor rod body (1). It can be effectively used for embankments and cut soils that have been washed, as well as for soft embankments with high moisture content and dry cut soils.

After pouring or burying the anchor rod at the site, if an expansion agent is injected from the rear end of the anchor rod body (1) into the gap (4) between the outer tube (2) and the inner tube (3), the expansion pressure [ As a result, when the mouth-shaped tongue pieces ((i)...) stand up, the anchor rod body (1) around them expands, so the pull-out resistance in the ground becomes extremely high. (3) is inserted, even if the wall thickness of the lA tube (2) is reduced, and even if many mouth-shaped cuts (5)... are provided,
The strength of the anchor rod (A) itself does not decrease significantly. Therefore, even if the diameter of the anchor rod (A) itself is reduced, significantly higher pull-out resistance can be ensured by increasing the number of cuts (5). It can be used in a closed state.

Furthermore, as will be explained in detail below, cuts (5) are made in the peripheral wall of the outer tube (2) of the anchor rod body (1) at the factory.
・For the crotch, it is only necessary to Ljnv at the site, and when burying it (it is sufficient to drill a hole with a diameter approximately equal to the outer diameter of the outer pipe (2), it is quick and economical for retaining walls etc.) It can make construction work possible.

In addition, the above embodiment (in this case, the anchor rod body (
The lA tube (2) and inner tube (3) in 1) are cylindrical bodies,
In the present invention, a hollow prism may be used. Further, in order to increase the strength of the anchor rod itself, cement, mortar, synthetic resin, etc. may be injected into the inner tube, or a cylinder or a square column may be adopted as the inner tube. The shape of the incision may also be a strict mouth shape (for example, but not limited to, ) shape, semicircular carving, U palm shape, or figure 7 shape, and the base of the incision may be in the shape of a strict mouthpiece (for example,
As long as it has two sides, its shape doesn't matter. The greater the number of cuts, the better, and even if a large number of cuts are provided, the strength of the anchor rod itself (supported by the J inner tube) will not be significantly reduced, but the number of cuts should be approximately 3 in the vicinity of the ends of the anchor rod, f and θ. Even if the anchor rod body (
Although it is provided only on the peripheral wall of the 1st tube (2) in 1), it may also be provided on the 1M wall of the internal information. In this case, make a roughly U-shaped or linear cut in the tube corresponding to the cut G in the tube, and inject the swelling agent into the inner tube, so that the tongue piece formed in the inner bone can be removed. Due to the large size of the erected or incised IM side,
The tongue formed by the outer tube stands up significantly, and as a result, the anchor rod has extremely high resistance to being pulled out of the ground.

Further, in the above embodiment (herein II), the anchor rod main body (1) and the closing fitting (7) are separate members, but in the present invention, they may be formed integrally, or The rear end of the closure fitting (7) or the distal end opening of the outer tube and the center of the closure fitting may be male and female screwed together.Furthermore, as shown in Fig. 3E, the rear end of the closure fitting (7) (70) may be provided with a fitting hole (7d), and the tip of the inner tube (3) of the anchor rod body (1) may be press-fitted and fixed therein. A closure fitting with a flat tip may be used.

Furthermore, in the above embodiment, the heat-shrinkable tube (8) is made of vinyl chloride resin, but it may be made of nylon resin, polyester resin, polypropylene resin, or the like. However, from the viewpoint of chemical resistance, water resistance, weather resistance, and physical strength, those made of -vinyl resin are preferable. For example, [Kopa made by Gunze Kobunshi Kogyo Co., Ltd.
lon S'-Tub'eJ (trade name) is preferably used. The tube (8) is open at both ends,
In particular, in the case of burial, the tip may be bottomed, and the anchor rod body may be attached to the bottomed heat-shrinkable tube so as to include the closing fitting.

Hereinafter, an example of the reinforcing method for the T/T installation that can be made thinner by adopting the above-mentioned actual J (one example of γ anchor rod A) for the TL crotch will be described. ) 3''!To be clear, the function of the anchor rod of the present invention is explained in detail from 6 to 11.

First, the tube (8
) Heat-shrink the tube (8) by pouring boiling water at about 0°C into the anchor rod (1) (this 1/11 inch).
ft. Next, attach a plurality of these anchor rods (A) to the non-direct axis (against the This anchor rod (A) is driven into the -L part of t9+. Depending on the length of time, it is preferable to use a longer anchor rod.However, it is not necessarily necessary to use a long anchor rod. If the ground is soft, it is preferable to use a long one. Even if the anchor rod (A) is driven into the embankment (11) in this way, the tube (8) is left lying on the outside, so the earth and sand in the embankment Moisture does not enter the anchor rod body (1) through the cuts (5).

Like this (each strained and driven anchor rod (A)...
・From the rear end opening 1 (/b) to Yu'+ Ministry (2) and In'i-
: Into the gap (4) of i' (3), inject Expanded Qi 1 (II) up to 100 points where the cut (5)... is provided. It is a mixture of this swelling agent, an inorganic compound mainly composed of silicic acid, a specific organic compound, and water.For example, Ono E.
"Pricecoo" manufactured by U Cement Co., Ltd. (commercial name)
A mixture of water and water can be preferably used. Furthermore, this Mb
[A tensioning agent (a mixture of small-phase cement, mortar 4C, etc.) may also be used.

The injected 1st inflating agent (11 inlets) has a maximum inflation pressure after about 72 to 211 hours, and as shown in Fig. The U-shaped tongue piece (5)... breaks the tube (8) and stands up.
The anchor rod (A) is provided with pull-out resistance. Fig. 7 shows the anchor rod body (1) with the tongue pieces (6) erected, with the torn tube (8) omitted.
FIG. 7 is a partial perspective view of FIG. 7, and FIG. Together with the erection of the tongue piece (6)..., the cut (51...) of the anchor rod body (1)...
・As the surrounding area expands (ampuple part θB)...),
Compressive stress is applied to the soil layers around them, causing consolidation. As a result, anchor rod (A)... and embankment f14I
A large frictional force is generated and the anchor rod (A)...
・The pull-out resistance Gj becomes higher.

After the expansion of the expansion agent 02) is completed, a closing fitting is attached to the rear end opening of each anchor rod (A) protruding from the retaining wall (9), and each anchor rod (A) is tightened with a tightening means such as a nut. ) to add tension to... By applying tension in this way, the tongue pieces (6)... stand up further due to the resistance on the turret, and the anchor rod (A)...
・The pull-out resistance becomes significantly higher.

In the manner 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 retaining wall of each anchor rod (A) is undesirable, a surface layer may be coated thereon.

When reinforcing the retaining wall in this way, the pull-out resistance of the anchor rod (A) of the above embodiment of the present invention is significantly inferior, so even if a relatively short 4cm rod is used, sufficient effect will not be obtained. The surface of the river is the same as that of vinegar ffj, (+ number is also f).Moreover, since it has a tube (8), the grain size of the earth and sand is small, and the embankment is soft and has a high moisture content.
It can also be effectively used for retaining walls constructed on cut soil, etc. Also, for example, spraying can be
Good stability can be imparted even to thin retaining walls such as 1. Furthermore, since the anchor rod main body (1) can be cut around the anchor rod body (1) by making cuts (5) at the factory and then installed or buried at the site, there is no need for many construction machines. Sanno machinery can be moved easily on site. [Therefore, even if the temporary scaffolding is simple,
The inconvenience is 4c and the construction efficiency is extremely high. The result is that there are fewer workers on site, which saves labor and makes it easier to operate, even in densely populated areas with people and facilities! ? Fli construction can be performed easily and quickly.

As explained above in detail, the present invention is extremely easy to manufacture, has extremely high pull-out resistance in the ground, has a small grain size of soil, and has a high moisture content. We can provide anchor rods that can be effectively used for embankments, drying, etc., and even retaining walls! 1t) It is also possible to provide anchorages that can be carried out quickly and economically.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the whole IW showing one embodiment of the present invention, Fig. 2 is a sectional view taken along the line X-X of Fig. 1, and Figs. Perspective view shown, Figure J Ll Above actual 7N! A cross-sectional view showing example i, penetrating the retaining wall and the hole provided in the embankment.
Fig. 7 (Cross-sectional view showing a part where the tongue piece formed in the above embodiment breaks the tube and stands up due to the tension pressure of the swelling agent in the J embankment, and the surrounding area becomes enlarged. 81W is a perspective view of the narrow part of the above-mentioned fruit, without omitting the broken tube, showing the state in which the tongue piece is erected and the IM side group is enlarged.
FIG. 8 is a cross-sectional view taken along the Y-Y line in FIG. 7 with the GJ expansion agent omitted. (A)... Anchor Rad (1)... Anchor jJ Tsudo body (2)... Yut? fang
(3)... L tube (
4) Between M (5) Cut (6) Tongue (7) Closure fitting (8) Heat-shrinkable tube (9) Retaining wall (
11)... Embankment (12)... Expanding agent (13)... Hull patent applicant Sekisui House Co., Ltd.

Claims (1)

[Claims] ■) A roughly U-shaped cut is made in the mti of the outer tube of the anchor rod body consisting of an outer tube and an inner tube, with the base facing away from the rear end of the anchor rod body, and the tip opening of the anchor rod body ( This closure fitting is attached so that an expansion agent or the like can be injected 115j into the gap formed between the outer tube and the inner tube from the rear end opening of the anchor rod main body, and a heat-shrinkable An anchor rod characterized in that a tube is fitted onto the anchor rod main body so as to hold the cut.