JPH0735868Y2 - Back formwork for concrete pouring - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a block for a block retaining wall in civil engineering and the like, and a backing form for concrete placing which is interposed between the glazed concrete and the open field.

[Prior art] Conventional retaining walls used for roads, revetments, etc. are assembled with formwork at the site, and so-called cast-in-place concrete retaining walls are used for placing glazed concrete, and, for example, Machi block. A so-called Machi block retaining wall is known, in which concrete concrete and gravel are used together for stacking. The former requires complex on-site work such as formwork and supporting work, requires a lot of skilled workers and manpower, and requires time and effort to disassemble the formwork after construction, resulting in a longer construction period and higher construction costs. There is a problem such as On the other hand, the latter Machimochi block retaining wall has the advantage of shortening the construction period and reducing the construction cost because the Machimochi blocks molded in the factory are piled up and constructed on site. The construction of the intelligent block retaining wall will be described with reference to FIGS. 7 to 9. As shown in FIG. 7, for example, the intelligent block 1 is composed of a substantially rectangular plate-shaped wall body 2 and a column body 3 in which four surfaces erected on the back surface thereof are curved and tapered. The knowledge block 1 is placed on a foundation (not shown) installed on the ground where the retaining wall is installed, and stacked sequentially as shown in FIG. In parallel with this, a separately prepared formwork 4 is brought into contact with the wall body 2 in parallel with the end face 3a of the pillar body 3 of each step block by backfilling the gravel 5 and then the body 2 The concrete 6 is filled and poured into the space S formed by the pillar 3 and the form 4 of the diversion block 1. By the way, as shown in FIG. 9, the encased concrete 6 has a role of fixing the back gravel 5 and integrating the earth retaining wall structure 7, so that the form 4 is usually a punching form. The deframing of this formwork 4
If done early, the concrete will flow out into the gravel 5 and the strength of the barrel concrete 6 will be impaired, and there will be a risk of fine movement of the Machi block 1 and the gravel 5 in the barrel concrete 6
However, there is a problem in that the solid retaining wall structure 7 is not formed due to the mixture of the metal. Therefore, it is necessary to timely remove the frame, but the judgment is difficult. There is a problem that it causes the retaining wall to collapse. In order to solve this problem, it has been proposed that the mold 4 is a back mold using a material such as cardboard.

[Problems to be solved by the invention] Since the conventional form 4 of this kind is intended to prevent the outflow of concrete milk, when it is directly constructed on the open field, the water exuding from the open field is drained. However, there is a problem that it causes collapse of the retaining wall.

An object of the present invention is to provide a back formwork for concrete pouring, which prevents concrete milk from flowing out and drains water from the open field.

[Means for Solving the Problems] According to the present invention, a wire net is sandwiched between a water-permeable mat and a water-impermeable mat that does not allow concrete milk to pass through, and a pipe attached to the wire net is attached to the water-impermeable mat. Is projected through.

The wire mesh is preferably formed of a wire material of metal or synthetic resin in a lattice shape, a diamond shape, or the like.

Further, it is preferable that the water-permeable mat is formed of a fiber aggregate and, for example, the trade name “Saran Rock” is used.

Further, the water-impermeable mat is obtained by uniformly dispersing natural fibers, synthetic fibers, various natural resins (starch paste, casein, etc.) and synthetic resins, which have been cut to an appropriate length, with a cotton swab press.
It is preferable to use an industrial resin felt which is manufactured in a heating furnace or a drying furnace while keeping its shape like a mat. The water-impermeable mat of the present invention does not completely block water, but when it is dry, for example, 500 cc of water is passed by a felt with a thickness of 15 mm after about 20 minutes. And if it is wet, about 6 cc
Pass in seconds. However, substantially no concrete milk is passed through.

Also, on the outer surface of the water permeable mat, a synthetic resin net-like filter that prevents clogging of the mat due to soil quality is stacked, and the entire back formwork is fastened and integrated with staples through a long cardboard material. Is preferred.

Further, the cylindrical body includes a support portion detachably attached to the wire mesh by a slit, and a connector portion standing upright with respect to the support portion at an angle slightly larger than the slope of the open field to which a drain pipe is attached, for example, a vinyl chloride material. It is preferable to form the drain connector by mode molding.

[Operation] In the back formwork for concrete pouring configured as described above, at the time of construction, the drainage connector is attached to the wire mesh at an appropriate place on the site through the slit, the drainage pipe is attached to the connector portion, and the tip is attached. The part is projected outward from the corner of the Machi block. Then, the space formed by the pillars and the back mold of the maternity block is filled with cast-in concrete.

In this state, the concrete milk is suppressed from flowing out to the alley side by the impermeable mat, and the water that has exuded from the open field is held in the permeable mat, and is suitable for the outside from the drain pipe via the drain connector. Is discharged.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the back formwork, which is designated by reference numeral A in its entirety, is a wire mesh 10.
Is sandwiched between a water-permeable mat 11 and a water-impermeable mat 12 that does not allow concrete milk to pass, and,
A filter 13 is placed on the outer surface of the water-permeable mat 11, and a reinforcing strip (not shown) (for example, the width of corrugated paper) is inserted from the filter 13 side.
The whole is fixed by staples 14 via 30 mm long material) and integrated, and the drain connector 20 which is a cylinder is attached to the wire mesh 10 at appropriate places (two places in the illustrated example) to attach the impermeable mat 12
Is formed so as to penetrate through and the end portion is projected. And
The back form A is formed as large as possible within the range permitted for transportation, for example, a length of about 4 m and a width of about 2 m. However, one of the iron rods may be flexible and formed into a roll shape.

Referring also to FIG. 2, the wire mesh 10 is formed of a metal or synthetic resin wire rod, but in the illustrated example, an iron wire 10a having an outer diameter of 2 mm.
The opening size is horizontal W (for example 100 mm) x vertical D (for example 60 m
m) is welded in a grid pattern. The shape of the openings of the wire net 10 is not limited to the above-mentioned lattice shape, but may be any shape such as a diamond shape or a square shape as long as the drainage connector 20 can be attached.

The water-permeable mat 11 is formed of a fiber aggregate, and for example, a product name “Saran Rock” having a thickness of 10 mm is used.

The water-impermeable mat 12 is made by cutting natural fibers, synthetic fibers and various natural resins (starch paste, casein, etc.) and synthetic resins that have been cut into appropriate lengths evenly with a cotton swab, then heating or drying. A 10 mm-thick industrial resin felt manufactured while maintaining a mat-like shape in a furnace is used.

A commercially available synthetic resin net having a mesh size of about 1 mm is used as the filter 13 to prevent clogging of the water permeable mat 11 due to soil properties. However, it can be omitted if clogging is not considered.

The drainage connector 20 is formed of a mounting portion 21 and a connector portion 22 that is orthogonal to the axis of the mounting portion 21 in one direction and obliquely intersects in the other direction by molding, for example, a vinyl chloride material.

The mounting portion 21 has a shape obtained by substantially dividing a cylinder, and a pair of slits 21 parallel to the axis into which the iron wire 10a can be inserted at both ends.
a and 21b are formed respectively. When the length of the slit 2b is 1, the length L of the support portion 21 is L ≧ W + 2l, and the length 1 of the slit 2a is 1 ≧ 2l.

The connector portion 20 is erected at an angle β slightly larger than the inclination α (FIG. 6) of the open field B to be constructed with respect to the bottom surface a of the support portion 21, and the outer diameter is large enough to allow the drainage pipe 23 (FIG. 6) to be inserted. Is formed.

At the time of construction, as shown in FIG. 6, one slit 2 of the drainage connector 20 is attached to the iron wire 10a at the proper position of the back form A at the site.
After fully inserting 1a, the other slit 21b is inserted into the opposing iron wire 10a to attach the drain connector 20 to the wire net 10.

Next, the drainage pipe 23 is attached to the connector portion 22 of the drainage connector 20, the tip end is projected from the corner portion of the Machi block 1 to the outside, and the body concrete 6 is attached to the pillar 3 of the Mitsuchi block 1 and the back formwork. The space S formed by A and A is filled and placed.

In this state, the impermeable mat 12 prevents the concrete milk from flowing to the side of the open field B. Further, the water that has exuded from the open field b is held by the water-permeable mat 11 and discharged to the outside from the drain pipe 23 via the drain connector 20.

[Advantage of the Invention] Since the present invention is configured as described above, the concrete milk is prevented from flowing out, and the water oozing out from the open field is appropriately drained to prevent the retaining wall from collapsing. be able to.

[Brief description of drawings]

FIG. 1 is a partially broken perspective view showing an embodiment of the present invention, FIG. 2 is a side sectional view of FIG. 1, and FIGS. 3, 4, and 5 show drain connectors. A front view, a top view and a side view, FIG. 6 is a side sectional view showing a state during construction of a retaining block retaining wall, FIG. 7 is a perspective view showing an example of the retaining block, and FIG.
FIG. 9 is a side sectional view showing a state before deframing at the time of constructing a retaining block retaining wall by a conventional formwork, and FIG. 9 is a side sectional view showing a state after deframed. A: Back mold, 10 ... Wire mesh, 11 ... Water-permeable mat, 12 ...
… Impermeable mat, 20 …… Drainage connector

Claims (1)

[Scope of utility model registration request] 1. A wire mesh is sandwiched between a water-permeable mat and a water-impermeable mat that does not allow concrete milk to pass through, and
A back formwork for concrete pouring, wherein a pipe body attached to the wire net is projected through the impermeable mat.