JPH0226979Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is a sediment inflow device that is installed at the opening of a through hole provided in the side wall of a concrete friyum to prevent earth and sand from flowing into the friyum. This relates to a prevention filter.

(b) Conventional technology Conventionally, this type of filter was based on a method in which the frame of the mesh was bonded to the opening of the through hole with adhesive after the concrete of the main body in which the through hole was provided had hardened. It takes time to bond, and since it is bonded from the inside, it is vulnerable to force from the outside, and it easily falls off.

In response to this, as seen in Design Publication No. 608342, a filter was developed in which elastic wings that expand rearward are provided at the rear of the filter, and the expansion elasticity is used to fit the filter into the through hole. This type of filter is also fitted into the through hole after the concrete has hardened.
Since they are fixed only by the expansion elasticity of the elastic wings, many of them fall off due to vibrations from trucks and the like during transportation to the site.

(c) Problems that the invention aims to solve In the past, as mentioned above, the filter was fixed by other means after the concrete of the main body had hardened, but the fixation was incomplete and caused the filter to fall off, making it difficult to carry out the work. It was also inefficient. The present invention attempts to solve the above-mentioned problems, completely fix the filter, and provide a filter that is also advantageous in terms of work efficiency.

(d) Measures to solve the problem Utilizing the fixing force of the concrete that makes up the main body, the filter is supported by the formwork of the main body, and concrete pouring including the fixing is performed. The main body equipped with a filter at the opening of the through hole is completed at the same time as curing.

(e) Function Since the filter is fixed by the concrete itself, the fixation is complete and
There is no need to perform a separate work to fix the filter.

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

Reference numeral 1 denotes a mesh frame with a flange-like step 2 provided at its rear end, and a stabilizing blade 5 further protruding from the step 2. 3 is a mesh for filtering earth and sand, and a support protrusion 4 is provided at the center of the back side. The main body A of Furium etc. is formed by pouring concrete into the void formed by the inner form B and the outer form C, but the outer mold is required to form the through hole. A dowel type D, which is a solid body with the same shape as the through hole volume, is fixed to the inner wall of the frame C with bolts E, and a through hole with the same shape as the dowel type D is constructed by preventing concrete from penetrating into that part. .

When using the filter according to the present invention, a fitting hole F to be fitted with the support protrusion 4 is formed at the tip of the inner mold frame side of the dowel mold D, and the support protrusion 4 is fitted into this to form the filter into the dowel mold D. It is supported at the tip of the dowel mold D and is pressed into the inner formwork B integrally with the dowel mold D.

When concrete is poured into the formwork constructed in this manner, the concrete envelops the stepped portion including the stabilizing blades 5 and the mesh frame, thereby fixing the filter. If the dowel mold D is removed together with the outer formwork when the concrete has hardened, a through hole with a filter fixed to the opening is formed all at once.

(g) Effects of the invention Since the invention is constructed as described above, the filter is fitted into the tip of the dowel mold from the beginning, and the filter is fitted into the formwork from the beginning, and at the same time the main concrete hardens. It is an extremely advantageous device because it is installed and fixed at the opening of the through hole, which improves work efficiency and prevents the filter from falling off.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view of the filter, Fig. 2 is a side view of the same, Fig. 3 is a sectional view taken along line X-X, Fig. 4 is a rear view of the same, and Fig. 5 is a front view of the filter. FIG. 2 is a sectional view showing the relationship between a filter and a mold for a through-hole portion when stamping a main body such as a frium. 1...Mesh frame, 2...Step, 3...
mesh, 4...support projection, 5...stability wing, A...
...Body concrete, B...Inner formwork, C...Outer formwork, D...Dowel shape, E...Bolt, F...Fitting hole.

Claims (1)

[Scope of utility model registration request] A filter for preventing the inflow of earth and sand, characterized in that a support protrusion that fits into a dowel shape is provided on the back side of a mesh constituting the filter, and a flange-like step is provided on the rear end side of the mesh frame.