JP3024937B2 - Construction method of underground continuous wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a continuous underground wall, and more particularly to a method of embedding a bent reinforcing bar for joining a continuous underground wall and a post-cast body.

[0002]

2. Description of the Related Art Conventionally, in order to integrate an underground continuous wall as a main structure or as a still water retaining wall with another post-cast frame, a bent reinforcing bar attached to a reinforcing bar cage is buried, and concrete After casting, concrete outside the bent reinforcing bars buried in the concrete is cut out to expose the bent reinforcing bars.

FIG. 4 is a side view for explaining a method of embedding a bent reinforcing bar for joining a post-cast body when a conventional underground continuous wall is constructed. In the conventional method, as shown in the figure, a bent reinforcing bar 2 is bent at 90 degrees and attached to a reinforcing bar cage 1, and a pipe-shaped protective sheath 3 is attached to a bent portion 2a of the bent reinforcing bar for each reinforcing bar. The installed reinforcing cage is installed at a predetermined position in the underground continuous wall hole. Then, concrete is poured around the reinforcing bar and the concrete is hardened to form the underground continuous wall 7.

[0004] When forming the underground continuous wall, the excavated surface of the bent rebar and the underground continuous wall hole has a certain interval in construction. Therefore, after the concrete is cast, the bent rebar is buried in the concrete. Therefore, in order to join and integrate the underground continuous wall and the post-cast frame through this bent reinforcing bar, the inside of the formed underground continuous wall is excavated, and the outside of the bent reinforcing bar buried in concrete is excavated. The portion of the concrete 7a is cut out to expose the bent reinforcing bar. When the portion 7a is large, a method may be adopted in which styrofoam or the like is mounted in advance as a protective body, the inside of the formed underground continuous wall is excavated, and the bent reinforcing bar is exposed.

[0005]

A conventional method for embedding a bent reinforcing bar for joining an underground continuous wall and a post-cast frame is as described above. It is necessary to cut out the concrete part outside the bent reinforcing bar buried inside and expose the bent reinforcing bar. Therefore, there is a problem that the amount of work of the shaving increases and the amount of waste increases.

[0006] In addition, it takes time to attach the protective sheath to each bent reinforcing bar, and sometimes the user forgets to attach the protective sheath. In addition, if Styrofoam is installed in advance, the Styrofoam may touch the excavation wall of the underground continuous wall hole when installing the reinforced cage, change its position, partially break, or damage the hole when placing concrete. There is a problem that concrete goes around because it does not adhere to the wall.

[0007] The present invention has been made in view of the problems of the conventional method of embedding a bent reinforcing bar, and minimizes the amount of excess concrete filling the outside of the bent bar, and exposes the bent bar. In addition to eliminating the need for concrete shaving work required to reduce the amount of waste, and reducing the generation of waste, the protective sheath is efficiently attached to each bent steel bar and protected when installing the reinforcing bar cage. It is an object of the present invention to achieve the object of making the body compact so that the body does not move, and keeping the protective body in close contact with the hole wall so that concrete does not go around.

[0008]

Means for Solving the Problems As a result of intensive studies on solving the above-mentioned problems, the present inventor has found that the bent rebar attached to the rebar cage is covered with a protective sheath and the outer side thereof is covered. Attention was paid to attaching a protective bag for introducing air or muddy water supported by a plate-like elastic material.

The present invention is based on the above idea. As a specific means for achieving the object, a bent reinforcing bar is attached to a reinforcing bar cage for an underground continuous wall, and a bent portion of the bent reinforcing bar is formed. A pressure-resistant protective bag is attached via a plate-like elastic material so as to cover with a protective sheath and cover the outside of the bent rebar, and in this state, the rebar basket is placed at a predetermined position in the underground continuous wall hole. Installed, inflate by introducing air or muddy water into the protective bag, fill the space between the bent rebar and the excavated surface of the underground continuous wall hole with the protective bag, and then into the underground continuous wall hole After the concrete is poured and the concrete is cured, the air or mud in the protective bag is removed, and the inside of the formed underground continuous wall is excavated, and the plate-shaped elastic material, the protective bag, Underground continuation consisting of removing the protective sheath and exposing the bent rebar It is obtained by the build method of construction.

According to the present invention, the bent portion of the bent reinforcing bar attached to the reinforcing bar cage is covered with one protective sheath, and the air supported by the easily deformable plate-like elastic material is further covered so as to cover the outside. Or install a protective bag to introduce muddy water, install the reinforcing bar cage at a predetermined position in the underground continuous wall hole, introduce air or muddy water into the protective bag and inflate it, The space between the excavation surface is filled with an inflated protective bag, and concrete is poured into the continuous underground wall hole. Therefore, the efficiency of the labor is improved by covering the entire bent portion of the bent rebar with the protective sheath all at once, and the amount of concrete surrounding the bent rebar is extremely reduced, and it is necessary to expose the bent rebar. In addition, concrete shaving work can be omitted, and generation of waste can be suppressed.

Further, in the present invention, as a method of attaching a pressure-resistant protective bag via a plate-like elastic material, a method in which the protective bag is fixed to the plate-like elastic material by using a reinforcing jig using a locking jig. Preferably, it is attached to a basket. If a rubber bag or the like is used as the protective bag, it becomes suitable for introducing air or muddy water and expanding the bag. In this way, the protective bag fixed to the plate-like elastic material is fixed by the hooking jig, so that the reinforcing cage is hung down and installed at a predetermined position in the underground continuous wall hole. The protective bag or the like does not come off by touching the excavated surface, and does not move even if external force such as buoyancy acts due to muddy water filling the underground continuous wall hole. In addition, even if a large buoyancy acts to move, the protective sheath covers the bent portion of the reinforcing bar as described later, so that the protective sheath plays a role of a hook against the buoyancy. Further, buoyancy can be positively utilized by introducing and using air instead of muddy water in the protective bag. In other words, the buoyancy acts to expect a locking effect at the bent portion, and the protection sheath can be easily set.

Next, in the present invention, it is preferable that the protective sheath for covering the bent portion of the bent rebar is formed in a bag shape and the opening at the upper end of the bag can be closed. And this protective sheath can be used in an independent bag shape, but by attaching the protective bag to a plate-like elastic material to which the protective bag is fixed, the above-mentioned effects can be expected, Work efficiency can be improved without forgetting to attach.

The method of embedding a bent reinforcing bar for joining an underground continuous wall and a post-cast frame according to the present invention is widely applicable. The present invention can be applied to construction of a composite wall or the like in which a part of the composite wall is integrated by integrating and punching.

[0014]

Embodiments of the present invention will be described below. FIG. 1 is a side view for explaining a method of embedding a bent reinforcing bar for joining an underground continuous wall and a post-cast frame in the method of constructing an underground continuous wall according to the present invention. The bent portion 2a of the bent reinforcing bar 2 attached to the reinforcing bar 1 is covered with a protective sheath 3,
Further, a protective bag 5 for introducing air or muddy water fixed to the easily deformable plate-shaped elastic member 4 is attached to the reinforcing bar cage by a locking jig 6 so as to cover the outside thereof,
Is connected to the protective bag at 8a, the reinforcing cage is set at a predetermined position in the continuous underground wall hole, and air or muddy water is introduced into the protective bag through the pipe from the above-ground portion to inflate (see FIG. 1). 5a), the space between the bent rebar and the excavation surface of the underground continuous wall hole is filled with an inflated protective bag, concrete is poured into the underground continuous wall hole, and the concrete hardens and the underground continuous wall 7 Is formed.

Next, after the concrete has hardened, the air or mud in the protective bag is removed, and the inside of the formed underground continuous wall is excavated, and the plate-shaped elastic material, the protective bag,
The protective sheath is removed to expose the bent rebar.

FIG. 2 shows that in the present invention, a protective bag for introducing air or muddy water is fixed to a plate-like elastic material, and a bag-like protective sheath for covering the bent portion of the bent rebar is made of a plate-like elastic material. It is a perspective view which shows an example of what was fixed integrally. That is, a rubber protective bag 5a (showing a state in which air or muddy water is introduced and expanded) is fixedly attached to the plate-like elastic member 4, and one side of the plate-like elastic member is bent by a bent reinforcing bar. The bag-shaped protective sheath 3 covering the bent portion is fixed and attached integrally. Reference numeral 3a denotes a string for closing the opening at the upper end of the bag-shaped protective sheath. Reference numeral 6 denotes a locking jig for attaching a plate-like elastic material to a reinforcing bar cage.

FIG. 3 shows another example of the mounting position of the locking jig.
This is an example. That is, a rubber protective bag 5a is fixedly attached to the plate-like elastic member 4, and the bag-like protective sheath 3 that covers the bent portion of the bent rebar is fixedly attached to one side of the plate-like elastic member. And a locking jig 6 is attached to a slide rail 9 provided on the upper edge of the bag-shaped protective sheath 3 via a reinforcing portion 10. With this hooking jig, the entirety of the protective bag, the plate-like elastic material, and the protective sheath can be attached to the bent portion of the bent reinforcing bar. According to this latching jig, when air is introduced into the protective bag and used, a latching effect is exerted by buoyancy, so that the latching jig can be easily attached.

[0018]

The construction method of the underground continuous wall according to the present invention is as follows.
Cover the bent portion of the bent reinforcing bar attached to the reinforcing bar with a protective sheath, and attach a protective bag supported by a plate-like elastic material to introduce air or muddy water so as to cover the outside. Installed at a predetermined position in the underground continuous wall hole, introduce air or muddy water into the protective bag and expand it, and fill the space between the bent reinforcing bar and the excavation surface of the underground continuous wall hole with the expanded protective bag. Concrete is poured into the underground continuous wall hole. Therefore, the amount of concrete filling the periphery of the bent rebar becomes extremely small, and the concrete shaving work required for exposing the bent rebar can be omitted, and the generation of waste can be suppressed. Therefore, work efficiency can be improved.

Further, the protective bag fixed to the plate-like elastic material is
By fixing with a hanging jig, when reinforcing bars are hung and installed at a predetermined position in the continuous underground wall hole, the attached protective bag etc. does not come off by touching the excavated surface However, due to muddy water filling the underground continuous wall hole, it does not move even when external force such as buoyancy acts.

Further, if the protective sheath is formed in a bag shape, it is possible to collectively cover the entire bent portion of the reinforcing bar, so that it is efficient, and at the same time, a large buoyancy acts to raise the protective sheath. Also, there is an effect that the protective sheath plays a role of a hook. And by integrating the protective bag and protective sheath,
It is also possible to reduce the size of the protective bag by reducing the forgetting of the installation and providing the position of the retaining jig on the protective sheath.

[Brief description of the drawings]

FIG. 1 is a side view for explaining a method of embedding a bent reinforcing bar for joining an underground continuous wall and a post-cast body in a method of constructing an underground continuous wall according to the present invention.

FIG. 2 is a perspective view showing a state in which a protective bag for introducing air or muddy water is fixed to a plate-like elastic member according to the present invention, and a bag-like protective sheath for covering a bent portion of a bent rebar is formed of a plate-like elastic member. FIG. 6 is a perspective view showing an example of a structure integrally fixed to the helmet.

FIG. 3 is a perspective view showing another example of a mounting position of a locking jig.

FIG. 4 is a side view for explaining a method of embedding a bent reinforcing bar for joining a post-cast body when a conventional underground continuous wall is constructed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rebar basket 2 Folded reinforcing bar 2a Folded part of bent rebar 3 Protective sheath 3a String for closing the opening of protective sheath 4 Plate-shaped elastic material 5 Protective bag 5a Inflated protective bag 6 Hanging jig 7 Underground continuous wall 7a Shaved part of underground wall 8 Piping hose 8a Connecting part of piping hose 9 Slide rail 10 Reinforcing part

──────────────────────────────────────────────────続 き Continuing the front page (72) Yoshio Nakamura, Inventor 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Chokichi Yoshihara 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Satoshi Yuki 2-2-8 Koraku, Bunkyo-ku, Tokyo Goyo Construction Co., Ltd. (72) Inventor Ichiro Yamaura 2-2-8 Koraku, Bunkyo-ku, Tokyo Goyo Construction Co., Ltd. (72) Inventor Hitoshi Morimoto 2-5-3 Misaki-cho, Chiyoda-ku, Tokyo Teppei Construction Co., Ltd. (72) Inventor Masato Sakai 2-5-3 Misaki-cho, Chiyoda-ku, Tokyo Teppei Construction Co., Ltd. (56) References JP 57-104715 (JP, A) JP-A-60-13170 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 5/18-5/20 E02D 29/045-29 / 055 E02D 29/00

Claims (3)

(57) [Claims] 1. A plate-like elastic material is attached to a reinforcing bar cage for an underground continuous wall, a bent portion of the reinforcing bar is covered with a protective sheath, and an outer side of the bent reinforcing bar is covered. A pressure-resistant protective bag is attached through the above, and in this state, the reinforcing cage is installed at a predetermined position in the underground continuous wall hole, and air or muddy water is introduced into the protective bag to expand the reinforcing bar. And the space between the excavation surface of the underground continuous wall hole with the protective bag,
After that, concrete is poured into the underground continuous wall hole, and after the concrete has hardened, air or muddy water in the protective bag is removed, and the inside side of the formed underground continuous wall is excavated, and A method of constructing a continuous underground wall, characterized by removing a resilient material, a protective bag and a protective sheath to expose a bent reinforcing bar. 2. A method of attaching a pressure-resistant protective bag via a plate-like elastic material, wherein a protective bag is fixedly attached to a plate-like elastic material, and the protective bag is attached to a reinforcing cage using a latching jig. The construction method of an underground continuous wall according to claim 1. 3. The method according to claim 1, wherein a pressure-resistant protective bag and a bag-shaped protective sheath are integrally fixed via a plate-shaped elastic material, and the protective bag is attached to a reinforcing bar cage with a locking jig. Construction method of underground continuous wall described.