JP2707326B2 - Locking box for underground wall construction - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a locking box for constructing a continuous underground wall in the field of civil engineering and construction.

(Prior Art) Conventionally, in the field of civil engineering and construction, many continuous underground walls have been constructed in order to constitute the foundations, retaining lands, or wells of various structures.

Thus, in order to construct the continuous underground wall, a rocking pipe is erected in the underground excavation trench, and a combination method of a partition plate and a reinforcing bar cage or as described in JP-A-64-10818. Means using a locking panel is employed.

(Means to be Solved by the Invention) The means using the rocking pipe includes drilling a plurality of pits in the ground by a mud drilling method, and installing a rocking pipe usually made of a circular steel pipe in the pit, After solidification, the space between the pits is excavated to form a groove having a substantially constant width, and concrete is poured into the groove.Therefore, the ground excavation near the peripheral surface of the rocking pipe is likely to be insufficient, so that the concrete However, there is a problem that it is difficult to perform the casting sufficiently, and the vicinity of the locking pipe is likely to be a structural weak point of the continuous underground wall, and as a means for preventing this, there is a means such as using a locking pipe with a partition plate fixed thereto. However, there is a problem that the cost and the effect of the pre-processing are not sufficient.

In addition, since the locking pipe is premised on being pulled out, if the building depth is 40 to 50 m or more, the concrete element of the preceding element adheres and the friction force with the excavation groove wall increases,
There is also a problem that the drawing becomes extremely difficult.

Furthermore, since the means using the partition steel plate and the reinforcing bar are integrally connected to withstand the internal pressure during concrete casting, the structure is complicated and the weight tends to be large, so heavy equipment is required for installation and the cost increases. There is.

Further, the means using the locking panel has a problem in that the manufacturing cost is increased in order to improve the accuracy, and there is a problem that the joint pile work on site requires time and effort.

The object of the present invention is to satisfy the temporary function, and to be a structural member as an underground wall reinforcing bar without being pulled out in a subsequent process, and to effectively construct a deep underground wall together with construction efficiency. It is another object of the present invention to provide a locking box for construction, which has a high function of fixing to a groove wall and a function of preventing concrete from leaking, is easy to manufacture, has a strong structure, and has a strong local structure. Easy installation,
A rocking box that can be constructed safely and efficiently, and has no construction problems such as spilling of concrete when casting concrete, and enables the construction of highly reliable underground walls. To provide. Still another object of the present invention is to provide a locking box in which joint processing for forming a rigid structure can be easily performed as required.

(Means for Solving the Problems) In order to achieve the above object, the locking box for underground wall construction according to the present invention comprises a pair of I-shaped steel or H-shaped steel flange edges which are separated by an appropriate number of spaces. A columnar body having a polygonal cross section by connecting with retaining ribs and having an opening formed on the side surface, and a swellable cloth body fixed so as to cover the opening side surface of the columnar body. It is configured.
Further, as the I-shaped steel or the H-shaped steel, one having a fitting joint or an engagement joint at the outer edge of the flange is used, and as the I-shaped steel or the H-shaped steel, a web is provided with an engaging reinforcing member. Use things.

Further, a rod-like body, a plate-like body or a rigid net-like body is used as the rib material for maintaining the interval, and a polymer resin fiber or a rubber-based film is used as the cloth-like body.

(Operation) The rocking box for building an underground wall according to the present invention includes:
Since the I-shaped steel or the H-shaped steel is paired, and the inner edges of the flanges are connected to each other with a spacing rib to form a columnar body, the structure is sturdy and the manufacturing cost is low.

Further, an expandable cloth fixed to cover the opening side surface of the columnar body, that is, the side surface having an opening formed by being connected by the spacing ribs, is provided with concrete in the locking box lumen. When it is cast, it is pushed by the concrete and swells outward, that is, on the wall of the excavation groove,
As a result, the locking box is accurately fixed to the set position, and when the concrete is poured into the connecting groove in a later step, the concrete can be prevented from wrapping around.

Next, when the I-shaped steel or the H-shaped steel has male and female fitting joints with flange outer edges, the connection work with the rebar in the subsequent process is easy, and the high strength connection with the rebar basket can be performed. .

Furthermore, even when an indirect engagement joint such as a hoop is provided, it is only necessary to make the end of the rebar basket follow the hoop rebar, so that it is easy to engage with the rebar cage and strong engagement is expected. it can.

When the I-shaped steel or the H-shaped steel is provided with the engagement reinforcing member on the web, the rigidity as a column is increased, the adhesion to concrete is improved, and a structure with high strength as an underground wall is obtained.

Next, when a rigid mesh such as a bar, a plate, or an expanded strip is used as the rib for maintaining the interval, an I-beam or an H-beam may be connected at a desired interval. It is easy to form a columnar main body having an appropriate cross section, and it is possible to set an arbitrary aperture ratio on the side of the opening.

In the case where the cloth-like body is fastened so as to cover the opening side surface by using a polymer resin fiber or a rubber-based film as the cloth-like body, the cloth-like body itself has appropriate strength to withstand the tearing force of concrete pressure and aggregate. Can be set, and it is easy to design to bulge outward due to concrete pressure.
A function as a locking box, that is, a function for surely performing temporary installation and a function for holding a wall surface when the underground wall is completed can be sufficiently provided.

(Embodiment) FIG. 1 is a partial schematic perspective view of a columnar main body 1a in an underground wall construction locking box (hereinafter simply referred to as a locking box) 1 according to the present invention, which is a pair of I-shaped steel members 2a and 2b.
Inner edges 3a ₁ , 3b ₁ of flanges 3a, 3b, 3c, 3d at
3c ₁ , 3d ₁ , rib material 5 for maintaining spacing consisting of plates of the same length
a to 5e are welded at intervals in the longitudinal direction of the flange. Below the ribs 5e, the ribs 5b
Although rib members 5f to 5h are provided at positions symmetrical to 5d, illustration is omitted.

Now, the connection with the rib members 5a to 5h allows the
The webs 4a and 4b in a and 2b are parallel to each other, and are formed in the shape of a column having a rectangular cross section, and the side surfaces of the columnar main body 1a connected by the rib members 5a to 5d become open side surfaces 7 having openings 6a to 6c. When concrete is poured into the lumen 8,
Concrete will flow outward from the openings 6a to 6c.

In the present invention, a rolled I-beam is used as an example as described above, but it goes without saying that a build-up I-beam, a rolled H-beam, a build-up H-beam, or the like can also be used. .

In addition, as the rib material, a rigid mesh body such as a rod or expanded metal can be used instead of the rib plate, and an appropriate material is used in consideration of the earth pressure and the required strength of the locking box. .

Now, in the present invention, as shown in FIG.
A swellable cloth-like body 9a described later is fixed to the opening side surface 7 so as to cover ~ 6c. In FIG. 2, reference numerals 10a and 10b denote pressing plates for pressing the widthwise ends of the cloth-like body 9a against the flanges 3a and 3c for fixing, and reference numerals 11a and 11b denote mounting bolts. 10c is a pressing plate attached to press the lower end of the cloth-like body 9a against the rib plate 5d, and 11c is a mounting bolt of the pressing plate 10c, and the rib plate 5d and the pressing plate 10c When the lower end enters the bottom of the excavation groove, the root compaction becomes good.

Further, the cloth-like body 9b is mounted at a position symmetrical to the cloth-like body 9a on the opposite opening side surface, but the mounting structure is the same as that in the above-mentioned case, so that the detailed description is omitted.

As the cloth-like bodies 9a and 9b, a polyester, nylon, vinylon or the like base cloth, and a strong fiber cloth such as a rubber-based film, cotton, or a canvas sheet obtained by laminating them, can be suitably used. .

Further, the cloth-like bodies 9a and 9b are fixed with sufficient dimensions so that the outward swelling is not broken.
That is, it is needless to say that an appropriate "fold" or "warp" may be provided.

Next, the procedure for constructing a continuous underground wall using the locking box according to the present invention will be described with reference to FIGS.

In FIG. 3, reference numerals 12a and 12b denote excavation grooves for constructing a continuous underground wall excavated at an appropriate distance from the ground by a well-known excavator by a mud solidification method.

Next, as shown in FIG. 4, locking boxes 13a to 13d are erected in the excavation grooves 12a and 12b, and then concrete 23 is poured into the locking boxes 13a to 13b as shown in FIG. In this way, as shown in the partial detailed view of FIG. 11, the pressure of the concrete 23 causes the cloth bodies 9a, 9b to bulge outward and bite into the wall surface of the excavation groove 12a.

Next, as shown in FIG.
Reinforcing cage 14a is built between a and 13b and locking box
Reinforcing cage 14b is built between 13c and 13d. At this time, crushed stones are introduced as needed between the webs of the locking boxes 13b and 13c and the wall surfaces at the ends of the excavation grooves 12a and 12b to prevent contamination of the web in the excavation in the next process and to reduce the amount of concrete. Means for improving the adhesion may be implemented.

Next, as shown in FIG. 7, the locking boxes 13a, 13
Concrete 24 is cast between the b and the locking boxes 13c and 13d, and the reinforcing bars 14a and 14b are buried in the concrete 24 to form the unit underground walls 15a and 15b.

Next, as shown in FIG. 8, the ground between the unit underground walls 15a and 15b is excavated by using an excavator using muddy water to form an excavation groove 16, and as necessary, locking boxes 13b and 13c.
After cleaning the outer surface of the web, as shown in FIG.
Reinforcing cage 14c is built in the excavation groove 16, and then, as shown in FIG. 10, concrete 25 is cast in the excavation groove 16,
A desired continuous underground wall 17 is completed by constructing a unit underground wall 15c that connects the unit underground walls 15a and 15b.

Thus, it goes without saying that a continuous underground wall similar to the continuous underground wall 17 is usually provided continuously to construct a desired building foundation, a well, or the like.

As described above, the locking box according to the present invention has not only a function as a locking box but also a function as a reinforcing bar material, so that the construction can be performed extremely efficiently. In addition to
Since the swelling cloth-like body is provided as a locking box, the groove wall fixing and concrete leakage prevention functions are high,
It is possible to construct a continuous underground wall that is excellent both in strength and economy.

When the joint member is provided on the flange of the I-shaped steel, the locking box and the rebar are easily rigidly connected, and the rebar material can exhibit extremely high strength.

Furthermore, the locking box of the present invention is easy to manufacture and rugged in form, but has a high mechanical strength, so that it can be built with high accuracy without any trouble in construction.

Next, an embodiment provided with a fitting joint, an engagement joint and an engagement reinforcing member in the present invention is shown in FIGS.

FIG. 12 shows an embodiment in which female fittings 18a to 1d are welded as fitting fittings to the outer edges of the flanges 3a to 3d, by fitting a male joint of a reinforcing bar cage (not shown). The locking box 1 is engaged with the reinforcing bar cage.

In the case of FIG. 13, a half cut piece of a straight steel sheet pile is
In the example shown in FIG. 14, a honeycomb half-piece of a straight steel sheet pile is welded to a flange of an I-beam as joints 27a to 27d. is there.

In the case of the example shown in FIGS. 12 to 14, the construction for interconnecting the reinforcing bars is extremely easy, and the strength as the reinforcing bars is high.

The joint fixed to the flange of the I-section steel may be either a female joint or a male joint. If a build-up I-section steel is formed using a half cut piece of a straight steel sheet pile, it is necessary to separately attach and process it as a joint. There is no cost, which is advantageous.

FIG. 15 shows an example in which T-shaped steel members 19a and 19b are welded to the webs 4a and 4d as engaging reinforcing members for improving the adhesion to concrete, and the edges (not shown) of the reinforcing rod cage are attached to the T-bars. Shaped steel 19a,
It is also possible to protrude in the vicinity of 19b to reinforce the engagement as a reinforcing bar material.

FIG. 16 is an example in which loop bars 20a to 20g are welded and projected as engagement joints on flanges 3c and 3d of I-section steel, and the edge of the reinforcing bar cage is projected near the loop bars 20a to 20f, and It shows an example in which joints are engaged with each other.

FIG. 17 shows an example in which bar-like joints 21a to 21g are provided as engaging reinforcing members penetrating the webs 4a and 4b, and FIG. In this example, angle irons 22a to 22c are fixed in parallel at intervals in the web longitudinal direction. 17 and 18
In the figure, the illustration of the bar-shaped joint and the angle steel provided on the web 4a is omitted.

When carrying out the present invention, the I-beam 2
An H-section steel may be used instead of a and 2b.

(Effects of the Invention) Since the present invention is configured as described above, the following effects can be obtained.

The locking box of the present invention has a simple structure, is easy to manufacture, and has a reinforcing function of concrete as a reinforcing bar itself in addition to a temporary function as a locking box, and has a good workability and is sturdy. Therefore, it is highly economical and practical, and is extremely useful as a member for constructing a highly reliable continuous underground wall.

[Brief description of the drawings]

FIG. 1 is a partial schematic perspective view of a columnar body in a locking box according to an embodiment of the present invention, FIG. 2 is a partial schematic perspective view of a locking box according to an embodiment of the present invention, and FIGS. FIG. 11 is an explanatory view of a construction procedure of a continuous underground wall using a locking box according to an embodiment of the present invention, and FIG. 11 is an explanatory view of a swelling state of a cloth body when concrete is poured into the locking box. 12 to 18 are partial schematic perspective views showing a locking box according to another embodiment of the present invention. 1 locking box, 1a columnar body, 2a, 2b is I-shaped steel, 3 a to 3 d flange, 3a _1, 3b _1, 3c _1, 3d ₁ inner edge, 4
a, 4b is a web, 5a to 5e is a rib, 6a to 6c is an opening, 7 is an opening side, 8 is a lumen, 9a and 9b are a cloth, 10a, 10b and 10c are pressing plates, 11a and 11b are Mounting bolts, 12a, 12b are digging grooves, 13a-1
3d is a locking box, 14a, 14b, 14c are reinforced cages, 15a, 1
5b and 15c are unit underground walls, 16 is excavation trench, 17 is continuous underground wall, 18
a to 18d are female fittings, 19a and 19b are T-shaped steels, 20a to 20g are loop bars, 21a to 21g are rod-shaped joints, 22a to 22c are angle irons, 23 to
25 is concrete, 26a-26d are joints, 27a-27d are joints.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-116921 (JP, A) JP-A-55-161113 (JP, A) JP-A-63-45847 (JP, U) 17009 (JP, B1)

Claims (5)

(57) [Claims] 1. A columnar shape having a polygonal cross section by connecting both flange ends of a pair of I-beams or H-beams with an appropriate number of spaced retaining ribs and forming an opening in a side surface. A rocking box for building an underground wall, comprising: a main body; and a swellable cloth-like body fixed so as to cover an opening side surface of the columnar main body. 2. An I-shaped or H-shaped steel having a fitting joint or an engagement joint at an outer edge of the flange.
The locking box for underground wall construction described. 3. The underground wall construction locking box according to claim 1, wherein the I-shaped steel or the H-shaped steel is provided with an engaging reinforcing member on the web. 4. The rocking box for underground wall construction according to claim 1, wherein the rib material for maintaining the spacing is a rod, a plate or a rigid mesh. 5. The underground wall construction locking box according to claim 1, wherein the cloth is a polymer resin fiber or a rubber film.