JPH108714A - Invert casting form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an invert casting form capable of efficiently casting both main stream and branch stream channel inverts while conventional mortar casting work to an invert in the bottom of a manhole is carried out by executing troublesome site adjustment work. SOLUTION: Cylindrical form bodies 3 having a semicircular section fitted to inlet and outlet 1a and 1b of a manhole 1 are built on the inlet and outlet and are inserted into them to fix, and a main stream invert 2a can be molded. An outside diameter of inserting sections 3a is expansible with screw jacks 3d provided to the insides of them to facilitate their insertion, and an outside curve ruler 5a and an inside curve ruler 5b divided from a curve ruler 5 can be mounted to the end edge sections 4 of the form bodies 3 to be inserted. Then, ruler tips 5e and 5e can be fitted to the surface of an inside diameter of a manhole wall hole 1c in a branch stream channel, and two outward form curve lines 2d and 2e of an invert 2b curved for the branch stream channel capable of being channelized to the invert 2a of the main stream can be formed, and a scratching type is moved along the curve lines 2d and 2e to dig the invert 2b to provide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a mortar in which a mainstream invert (semicircular channel) and a curved invert for a branch flow channel which can be guided to the mainstream invert can be cast at the bottom of a manhole. In addition, it belongs to an invert casting formwork which is used by being inserted into a flowing water inlet / outlet below the manhole.

[0002]

2. Description of the Related Art Conventionally, when a mortar is cast at the bottom of a manhole, a standard 900 mm inside diameter manhole is slightly higher than a flowing water inlet / outlet penetrated below the manhole, and is located on the opposite side of the inner wall surface of the manhole. At the place, an opposing U-shaped step is protruded, and the worker straddles both feet using the step as a foothold, and casts mortar using a formwork or various trowels adapted to the site.

[0003]

Since the conventional inverting is an in-place setting operation, it takes much time for setting up and mortaring, resulting in extremely low work efficiency.
In particular, in the installation of curved inverts for branch waterways, the formwork is manufactured each time on site, so it takes more time and effort, and it is a bottleneck when trying to improve workability. Had become.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has an object to improve the efficiency of invert installation. The cylindrical form body having a circular cross section is inserted into the flow water inlet / outlet, and the above-described insertion is carried out for the installation of a curved invert for a branch flow channel that can be guided to the main flow invert. Attach a curve ruler to the edge of the formwork, and divide the curve ruler into outer and inner curve rulers which can be adjusted to face each other. The manhole is characterized by being formed so as to be able to form two outer curved lines of the invert for the branch flow channel by abutting against the inner diameter of the manhole wall hole of the above and attaching to the end edge thereof. Simple on the bottom In it is intended to provide a main flow and also to curved inverted for branch water passage can mortar strokes set and the inverted hitting 設用 mold. That is, the solution of the present invention is as follows. (1) In the mold body 2 for forming a main flow channel for a manhole invert made of a cylindrical body having a semicircular cross section, a long edge having a downwardly sloped inwardly opposed upper end on both sides in the longitudinal direction of the mold body 2. 4. A mold for inverting installation, characterized in that a branch flow channel forming curve ruler 5a, 5b is mounted on the upper surface of the long edge portion 4 having the descending slope so that the mounting position and the mounting angle can be adjusted. . (2) The curve rulers 5a and 5b are attached to the manhole-invert mainstream waterway forming mold body 2 having a semicircular cross-section so as to be adjustable in the attachment position and the attachment angle. A main end of the mainstream invert 2 is formed by abutting the protruding end 5e with the inner diameter surface of the manhole wall hole of the branch flow channel when the invert is placed.
Curved invert 2 for branch waterway that can be conducted to a
(1) The invert casting mold according to (1), wherein b can be easily formed. (3) A long groove 4b for attaching a curve ruler 5a, 5b is formed along the longitudinal direction in the edge portion 4 on both sides of the form body 2, and the curve ruler 5a, 5b has a curved direction. A long groove 5c for attachment is formed along the edge of the fixing tool 5d.
(1) and (2), wherein the mounting position and the mounting angle can be adjusted and attached to the edge portion 4 thereof. (4) The curved rulers 5a and 5b are formed into two types which are symmetrically curved for the left or right water outlet, and can be attached to either one of the left and right sides of the edge 4 thereof. The invert casting formwork according to any one of (1) to (3), wherein: (5) A thin steel plate is bent into a semicircle to form the form body 2, and at both upper ends of the form body,
Each of the angle members is made to face inward in an inverted L-shape, and the upper surfaces of the respective angle members are integrally welded with a downward gradient, thereby forming edge portions 4 on both sides thereof (1). Invert casting formwork.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of an invert casting mold according to the present invention. FIG. 1 is a plan view of an invert casting mold according to the present invention, which is inserted into a flowing water inlet / outlet at a lower part of a manhole and a curve ruler is removed, and FIG. 2 is an enlarged sectional view of the same mold along the line A-A in FIG. FIG. 3 is a plan view of the same mold frame of FIG. 1 when a curve ruler is attached, FIG.
FIG. 4 is an enlarged cross-sectional view of the same frame to which a curve ruler along the line BB of FIG. 3 is attached. In the drawing, 1 is a manhole, 1a is a flowing water inlet (main flow), 1b is a flowing water outlet (main flow), 1c is a manhole wall hole for a branch flowing water channel, 2 is an invert casting formwork,
3 is a mold body, 3d is a screw jack, 4 is an edge, 4a is an angle material, 5 is a curve ruler, 5a is an outer curve ruler,
5b is an inner curve ruler, 5d is a fixing tool, and 5e is a ruler tip. The invert casting mold 2 of the present invention is used by being inserted into the flowing water inlets and outlets 1a and 1b at the lower part of the manhole 1, and protrudes inwardly at upper end portions 3b and 3b on both sides of the mold body 3. By attaching the curve rulers 5 to the left and right edge portions 4, 4, in addition to the mortar of the mainstream invert 2a, the curved invert 2b for the branch flow channel that can be guided to the mainstream invert 2a is driven. It has a feature in its structure that can be installed together.

The form body 3 of the invert form body 2 is formed by bending a thin steel plate into a semicircular shape and forming a long, semicircular cross-sectional tubular body which can be inserted and inserted over the flowing water inlets and outlets 1a and 1b of the manhole 1. The angle members 4, 4 are respectively opposed inwardly in an inverted L-shape to the upper end portions 3 b on both sides of the form body 3, and the upper surface of each angle member 4, 4 Welding is performed integrally with the invert 2a of the main stream formed at the center with an inward descending gradient so as to flow easily, and the inwardly protruding edge portions 4, 4 are formed at the upper left and right ends of the form body 3. It is shaped. In addition, the running water inlets and outlets 1 at both ends of the
In the vicinity of the insertion portions 3a, 3a with respect to a and 1b, a screw jack 3d is installed between the inner surfaces 3c, 3c of the left and right angle members 4a, 4a to reduce the semicircular outer diameter of the insertion portion 3a. Adjustable. The screw jack 3d
(FIG. 2) is formed so that the left and right threaded rods connected to the left and right inner surface portions 3c, 3c are screwed into a central left and right threaded nut, and by rotating the nut, the left and right threaded rods are pulled and pushed. The right and left angle members 4 and 4 connected thereto are also pushed and pushed to expand and contract the outer diameter of the insertion portion 3a so that the outer diameter can be adjusted.
The outer diameter is reduced to facilitate insertion into the flowing water inlets and outlets 1a and 1b, and after insertion, the outer diameter is enlarged and firmly fixed to the flowing water inlets and outlets 1a and 1b.

According to the present invention, a curved ruler 5 is provided on the left and right edge portions 4, 4 of the formwork 3 which faces inward with the above gradient.
(FIG. 3) can be freely attached, and by attaching the curve ruler 5, the two outer curved lines 2d and 2e of the curved invert 2b for the branch flow channel, which can be guided to the mainstream invert 2a, can be formed. It is characterized in that it can be formed. Six long grooves 4b for attaching a curve ruler 5 are formed in the edge portions 4 on both sides thereof along the longitudinal direction. The curve ruler 5 is an outer curve ruler 5a.
And an inner curve ruler 5b, each of which is divided into five on the outer ruler 5a and the inner ruler 5 along the curve direction.
6b, six long grooves 5c for attachment are formed. When the curve ruler 5 is mounted, the outer and inner rulers 5a, 5b are fitted with the opposed ruler protruding ends 5e, 5e against the inner diameter of the manhole wall hole 1c for the branch flow channel of the manhole 1. The long grooves 5c, 5c of the inner and outer rulers 5a, 5b are superimposed on the two long grooves 4b, 4b and concentrically arranged, and fastened via a detachable fixing tool 5d. At this time, the outer curve ruler 5a is arranged concentrically with reference to the fact that the inner protruding end 5f of the inner curve ruler 5b is substantially on the center line of the form body 3.

In FIG. 3, since the manhole wall hole 1c for the branch water channel is on the left side (on the drawing), a curved ruler 5 attached to the left edge 4 and curved for the left flowing water inlet is provided. However, when the manhole wall hole 1c for the branch flow channel is on the right side, a curved ruler 5 curved for the symmetrical right side flow water inlet is attached to the right edge 4 and used. Thus, it is desirable to prepare two types of left and right symmetric curve rulers 5, 5 for the common mold body 3 (FIG. 1).

Next, the mortar casting of the mainstream invert 2a and the curved invert 2b for the branch flow channel using the invert casting mold 2 of the present invention will be described. First, the mold body 3 of the mold form 2 is inserted between the flowing water inlet 1a and the flowing water outlet 1b in a symmetrical state (FIG. 2) when viewed from the front, and is bridged in the manhole 1. Mortar is poured into the bottom 1d of the manhole and filled up to the height of the left and right edges 4 and 4, and the upper surface follows the left and right edges 4 and 4 and the upper surface has inwardly facing down slopes 2c and 2c. To shape. Next, the outer curve ruler 5a and the inner curve ruler 5b of the curve ruler 5 curved for the left flowing water inlet are provided on the left edge 4 having the manhole wall hole 1c for the branch flowing water channel.
Are lightly tightened via the fixing tool 5d. next,
Outer and inner rulers 5a, 5b of rulers 5e, 5b, 5b
e is brought into contact with the inner diameter of the manhole wall hole 1c, the inner protruding end 5f of the inner ruler 5b is arranged on the center line of the form body 3, and the outer curve line 2d of the outer ruler 5a is connected to the inner ruler 5b. The fixing device 5b is disposed so as to be substantially concentric with the outer curve line 2e (FIG. 3), and the fixing device 5b is firmly tightened. In this arrangement, the outer and inner curve rulers 5a and 5b are placed on the left inclined surface 2c as shown in FIG. 4, and the upper surface thereof is slid. Next, a semicircular scraping die (not shown) having the same diameter as the flowing water inlet 1c is inserted into the outside and inside curved rulers 5a, 5b on the slope surface 2c before hardening. Outline curve line 2
d, while moving along the curved direction while scratching along the 2e, the curved invert 2d for the branch waterway
To dig. In addition, the mainstream invert 2a is formed by the above-mentioned formwork 2, but when the above-mentioned invert 2b for the branch flow channel is excavated, a scraping mold hits the formwork 2 where it merges with the mainstream invert 2a. It cannot be set up.
Therefore, the digging of the part that merges with the mainstream invert 2a,
After removing the formwork 2 together with the ruler 5, the mortar is installed to complete the mortar placement of the inverts 2a and 2b for the mainstream and branch flow channels.

[0010]

The invert casting mold of the present invention is constructed as described above, so that the mortar is not cast at the troublesome site as in the prior art, but the mold is placed in the running water under the manhole. The mainstream invert can be formed simply by simply inserting it into the entrance, and the outer and inner curve rulers divided by the curve ruler are attached to the formwork in accordance with the water inlet for the manhole branch channel. In addition, it is possible to form two curved lines of a curved invert for a branch flow channel that can be led to the mainstream invert, which greatly contributes to the efficiency of the installation of the invert in the manhole. In particular, since a screw jack is installed inside the insertion portion of the formwork so that the outer diameter can be easily enlarged and reduced, the insertion of the formwork can be performed with one touch, and the driving is performed. Since the insertion work can be firmly attached to the work, the efficiency and stability of the insertion work can be improved. Also, since the curve ruler is mounted in a state of being placed on a slope surface to be cast, the ruler protruding end is brought into contact with the inner diameter of the manhole wall hole for the branch flowing water channel, or the inner protruding end is set to the center line. It is possible to increase the efficiency of mounting work such as aligning and arranging the inner and outer rulers concentrically.

[Brief description of the drawings]

FIG. 1 is a plan view of an invert casting mold of the present invention inserted into a lower portion of a manhole, with a curve ruler removed.

FIG. 2 is an enlarged cross-sectional view of the same frame taken along line A-A in FIG.

FIG. 3 is a plan view showing a state where a curve ruler of the same frame of FIG. 1 is attached.

FIG. 4 is an enlarged sectional view taken along line BB of FIG. 3;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Manhole 1a Flow water inlet 1b Flow water outlet 1c Manhole wall hole for branch flow channel 1d Bottom 2 Form for invert installation 2a Invert of main flow 2b Invert from branch flow channel 2c Slope for installation 2d Outline curve 2e Outer curve line 3 Form frame 3a Insertion part 3b Upper end part 3c Inner surface part 3d Screw jack 4 Edge part 4a Angle material 4b Mounting long groove 5 Curve ruler 5a Outside curve ruler 5b Inner curve ruler 5c Mounting long groove 5d Fixing tool 5e Ruler tip 5f Inside tip

Claims (5)

[Claims] 1. A manhole invert mainstream waterway forming mold body 2 comprising a cylindrical body having a semicircular cross section.
A long edge 4 having a downward slope facing inward at both upper ends in the longitudinal direction, and a branch flow channel forming curve ruler 5a, 5b on the upper surface of the long edge 4 having the downward slope.
Characterized in that the mounting position and the mounting angle can be adjusted. 2. The curve rulers 5a and 5b are attached to the cylindrical body 2 having a semicircular cross-section for manhole invert mainstream waterway formation so that the attachment position and the attachment angle can be adjusted. A protruding end 5e is provided at the front, and the protruding end 5e is brought into contact with the inner diameter surface of the manhole wall hole 1c of the branch flow channel, thereby facilitating the curved invert 2b for the branch flow channel that can be guided to the mainstream invert 2a. The invert casting formwork according to claim 1, wherein the formwork can be formed in the form. 3. A long groove 4b for attaching a curve ruler 5a, 5b along the longitudinal direction is formed in an end edge portion 4 on both sides of the form body 2, and the curve ruler 5a, 5b has The mounting long groove (5c) is formed along the curve direction, and the ruler can be mounted on the edge portion (4) through a fixing tool so that the mounting position and the mounting angle can be adjusted freely. 1
Or the formwork for invert placement according to 2. 4. Curve rulers 5a and 5b are formed in two types which are symmetrically curved for a left side water port and a right side water port, and are attached to one of right and left sides of an edge portion 4. The invert casting formwork according to any one of claims 1 to 3, wherein the formwork is formed. 5. A thin steel plate is bent into a semicircular shape to form a mold body 2, and upper and lower ends of both sides of the mold body are opposed to each other with an angled material in an inverted-L shape inwardly. The invert casting formwork according to any one of claims 1 to 4, wherein the upper surfaces of the respective angle members are integrally welded to each other with a descending gradient to form edge portions 4 on both sides thereof.