JPH0660497B2 - Manufacturing method of concrete arch culvert - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a concrete arch culvert used for a sewer, an underground passage, a common ditch, or the like.

[Problems to be Solved by the Invention]

Conventionally, in order to manufacture an arch culvert by placing concrete, as shown in FIG. 7, the arch part 2 of the dedicated formwork 1 is set down (opposite to the usage state of the arch culvert), and the bottom part is placed. A method of pouring concrete from 3 is known. As shown in FIG. 8, this is installed with the arch portion 2 facing up, and when poured from this arch portion 2, the bottom portion 3
The concrete does not flow smoothly, but if it is inverted as shown in FIG. 7, it can flow smoothly due to the curved portion of the arch portion 2 and a good-quality arch culvert with uniform density can be obtained.

However, if the formwork is installed with the arch part at the bottom, the stability will be impaired and the demolding work after concrete pouring will be troublesome.
Furthermore, when it is used for sewers, it is necessary to put it upside down and put it in a working state, which is troublesome for construction work.

Alternatively, as shown in FIG. 9, a method of standing the formwork 1 and pouring concrete from the upper end can be considered. However, it is slightly advantageous in terms of the stability of the formwork and the smooth pouring of concrete, but it requires the work of hoisting it down to put it into use, which makes the construction work troublesome. However, a curved pipe (shown by an imaginary line) is disadvantageous in terms of stability.

The present invention has been made in view of the above circumstances. Its purpose is to make it possible to manufacture an arch culvert in which concrete can be poured smoothly into the formwork and the concrete is evenly and densely packed. As with the state of use, the bottom part of the arch culvert is molded downwards, the stability of the formwork, the arch culverts formed To propose a method for manufacturing a concrete arch culvert with excellent handling property.

[Means for Solving the Problems]

This invention is a method for manufacturing a concrete arch culvert, in which the bottom inner mold surface and the arch outer mold can be opened and closed by using the bottom inner mold, the side inner mold, and the arch inner mold. , Assemble the formwork with concrete injection holes on the top of the arch outside formwork, place this formwork with the bottom formwork down, first open the bottom inner formwork, and from here, place the concrete in the bottom formwork. After pouring and filling densely and closing the inner form, concrete is injected from the top of the arch part, concrete is filled into the side part form, then concrete is injected from the injection hole on the top and inside the arch form It is a method for manufacturing a concrete arch culvert, which is characterized in that the concrete is filled with concrete.

〔Example〕

 The present invention will be described below with reference to illustrated embodiments.

In this manufacturing method, the arch culvert is molded using the mold 4 shown in FIG. Form 4 is bottom 6 of arch culvert 5
A bottom formwork consisting of a bottom inner formwork 7 and an outer formwork 8 forming
It is composed of an inner side mold 10 that forms both side parts 9, 9, a side form mold that includes an outer mold 11, an inner arch part mold 13 that forms the arch part 12, and an arch part form mold that includes an outer form frame 14. ing.

The bottom inner mold 7 is rotatably supported on one side, and is rotatable in the upward direction of arrow A. Further, the arch outer formwork 14 has a top frame 17 having a concrete injection hole 16 on the top thereof, and the both sides of the outer formwork 14 can be opened and closed in the upward direction of the arrow B by axially attaching the lower side part. It has been done.

To manufacture arch culverts using this form 4,
First, the bottom inner formwork 7 is opened, concrete 18 is poured into the formwork of the bottom part 6 from here, vibration is given, compaction is made for compact filling, and then the inner formwork 7 is closed.
(See FIG. 1) Next, concrete is poured from the top frame 17 mounting holes 19 of the arch outer mold 14 into the side molds of both side parts 9, 9 and vibration compaction is performed (FIG. 2). After molding both sides, the top frame 17 is attached to the attachment hole 19 and the injection hole 1
Concrete is poured and filled into the mold of the arch portion 12 from 6 (see FIG. 3).

When the concrete 18 in the mold is hardened, the inner, outer molds 13, 14, 10, 11, 7, 8 at the top, side, and bottom are disassembled and demolded to complete the production of the arch culvert. At the time of demolding, the arch outer mold 14 and the bottom inner mold 7 are opened to promote demolding (see FIG. 4).

〔The invention's effect〕

 The present invention is configured as described above and has the following effects.

When pouring concrete on the bottom of the formwork, the inner formwork 7 that hits the upper surface of the bottom formwork is opened, and concrete is injected from here to fill the concrete, so that the bottom part, which was apt to cause defects, is solid. It can be an organization.

Concrete can be easily poured from the top of the arch into the side and arch parts of the formwork arranged with the bottom part form down, so that solid filling can be performed easily.

Since the mold is arranged with the bottom mold facing down, the stability of the mold is good and the workability of arch culvert construction is improved.

Open the sides of the bottom inner mold and the arch outer mold when demolding,
In addition, the molds of the bottom, sides and arch can be disassembled for division and demolding, so even large arch culverts can be demolded efficiently.

The height of the arch culvert can be changed by using different heights of the inner and outer side molds.

As described above, according to this manufacturing method, it is possible to efficiently manufacture a uniform and uniform arch culvert and improve the workability of the arch culvert.

[Brief description of drawings]

1 to 4 are manufacturing process drawings of the arch culvert by this manufacturing method, FIG. 5 is a schematic sectional view of a mold used in this manufacturing method, FIG. 6 is a sectional view of the arch culvert, and FIG.
FIG. 8, FIG. 8 and FIG. 9 are a sectional view and a perspective view of a mold used in a conventional manufacturing method. 1 ... Formwork, 2 ... Arch part, 3 ... Bottom part, 4 ... Formwork, 5 ... Arch culvert, 6 ... Bottom part, 7 ... Bottom inner formwork, 8 ... Bottom outer formwork, 9 ... Side part, 10 ... Side inner formwork, 11 ... Side outer formwork, 12 ... Arch part, 13
…… Form inside arch, 14 …… Form outside arch, 16…
… Injection hole, 17 …… Top frame, 18 …… Concrete, 1
9: Mounting hole.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiaki Ishii 3-3-2, Nishiarai-cho, Adachi-ku, Tokyo (72) Inventor Shigeji Nakagawa 2-15-35 Yanagikubo, Higashi-Kurume, Tokyo (56) References Special Kai 57-33632 (JP, A) JP 60-33977 (JP, A)

Claims (1)

[Claims] 1. In a method for manufacturing a concrete arch culvert, bottom inner mold surfaces and both side surfaces of arch outer molds can be opened and closed by using bottom inner molds, side inner molds and arch inner molds. , Assemble a formwork with concrete injection holes at the top of the arch outside formwork, place this formwork under the bottom formwork, first open the bottom inner formwork, and from here, place the concrete in the bottom formwork. After pouring and filling densely and closing the inner form, concrete is injected from the top of the arch part, concrete is filled into the side part form, then concrete is injected from the injection hole on the top and inside the arch form A method for manufacturing a concrete arch culvert, which comprises filling concrete with concrete.