JP3162679B2 - Manhole molding spacer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole forming spacer disposed between a manhole outer wall form and a manhole inner wall form.

[0002]

2. Description of the Related Art Conventionally, in a manhole molding spacer, a core rod such as a wire is passed through a center portion of a substantially disk-shaped integrally formed spacer, and a plurality of spacers are arcuately formed by the core rod on an outer wall of the manhole. It is generally known that the manhole wall is uniformly formed by being arranged between the mold and the manhole inner wall mold.

[0003]

In the above-mentioned known apparatus, not only the workability is poor because the core rod does not easily pass through the spacer, but also the wall diameter of the manhole is slightly different since the diameter of the spacer is fixed. There is a problem that can not respond to.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to connect a core to a core rod such as a wire by connecting a spacer to two divided bodies. It is an object of the present invention to provide a manhole-forming spacer which is excellent in workability and inexpensive, and can easily pass through a spacer and can cope with a manhole having a slightly different wall diameter.

[0005]

In order to achieve the above object, a manhole-forming spacer according to the present invention comprises two substantially semi-cylindrical divided bodies which are connected by hinges to one end of the outer periphery thereof and to the other outer periphery. In the vicinity of the end, a locking band is formed on one of the divided bodies, a locking member and an adjusting handle are formed on the other divided body, and a substantially semicircular hole through which a core rod is inserted is inserted in the center of the diameter. A plurality of open windows are provided in each of the semi-cylindrical columns, and a plurality of contact projections to the mold are formed on the outer periphery of each of the semi-cylindrical columns.

[0006]

1 to 5 relate to an embodiment of the present invention. FIG. 1 is a front view of a manhole forming spacer according to the present invention, FIG. 2 is a front view before assembling of FIG.
FIG. 3 is a side view of FIG. 1, FIG. 4 is an explanatory plan view in which spacers are installed on manhole inner and outer molds, and FIG. 5 is an explanatory sectional view of a main part of FIG.

In FIG. 1, reference numeral 1 denotes an entire manhole-forming spacer. The spacer 1 is made of a synthetic resin such as polypropylene, and is composed of substantially semi-cylindrical divided bodies 2 and 3. The divided bodies 2 and 3 are connected to each other by a hinge 4 at one end of the outer periphery.

[0010] A locking band 5 is formed near the other outer peripheral end of the divided body 2, and a locking member 6 and an adjusting handle 9 are formed near the other outer peripheral end of the divided body 3. Non-slip irregularities 7 are formed on the entire upper surface of the locking band 5, and non-slip irregularities 8 are also formed on the opposing surface of the locking member 6. The semicircular holes 11a and 11b for forming the hole 11 through which the core rod 10 such as a wire is inserted are recessed at the center of the diameter of the divided bodies 2 and 3. Reference numeral 12 denotes a slip-preventing guide plate provided when the two divided bodies provided near the center of both surfaces of the divided bodies 2 and 3 are integrated.

Further, the entire surface of the divided bodies 2 and 3
A plurality of open windows 13, 13,... Through which a concrete material or the like constituting the manhole wall flows are provided. Further, on the outer periphery of the divided bodies 2 and 3, a plurality of contact protrusions 16, 16,. In addition, 17, 17, ... are the reinforcement frames of the spacer 1.

In forming the manhole wall in the spacer having the above configuration, first, the spacer 1
The core rod 10 such as a wire is arranged in the hole 11 at the center in a state in which is opened, and the above-mentioned irregularities 7 and 8 provided on the respective surfaces of the locking band 5 and the locking member 6 with the divided bodies 2 and 3 are formed. The spacer 1 is attached to the core rod 10 by stopping in combination. The diameter of the diameter can be adjusted to some extent by adjusting the locking position between the locking band 5 and the locking member 6 by slightly lifting the adjustment handle 9 upward. Then, the above operation is repeated on the plurality of spacers 1 to form the core rod 10 in an arc shape (see FIG. 4).

Next, the inner and outer formwork 1 for forming a manhole wall is described.
A plurality of the core rods 10 and 4, 15 each having an arc shape and a plurality of spacers 1 attached thereto, are installed. At this time, since the plurality of contact projections 16, 16,... Formed on the outer periphery of the spacer 1 are in contact with the inner and outer mold frames 14, 15, the plurality of spacers 1 are mounted with the core rod 10 in an arc shape. There is no slant or rattling. Then, after the installation of the spacer 1 is completed, a concrete material is poured from above to form a manhole wall having a uniform width and a certain degree of durability. In addition, even if the opening for pouring the concrete material is deviated, the concrete material flows through the spacer 1 by the plurality of open windows 13 provided on the entire surface of the spacer 1. Can be.

In the above embodiment, the spacer 1 is vertically formed into an arc shape in order to form a columnar manhole wall. However, the spacers 1 are arranged vertically and horizontally obliquely in a fine portion of the manhole wall according to the shape. It is also possible to use it.

[0013]

According to the manhole-forming spacer of the present invention, the outer peripheral ends of the two substantially semi-cylindrical divided bodies are connected to each other by a hinge, and one divided body is formed near the other outer peripheral end. Forms a locking band, forms a locking member and an adjustment handle on the other divided body, and has a substantially semicircular hole through which a core rod is inserted at the center of the diameter. Are provided, and a plurality of abutting projections are formed on the outer periphery of each semi-cylindrical column, so that a core rod such as a wire can be easily passed through the spacer, and even if the wall diameter of the manhole is slightly different. It is a spacer that can be used, is excellent in workability, and is inexpensive for manhole molding.

[Brief description of the drawings]

FIG. 1 is a front view of a manhole-forming spacer according to the present invention.

FIG. 2 is a front view of FIG. 1 before assembly.

FIG. 3 is a side view of FIG. 1;

FIG. 4 is an explanatory plan view in which spacers are provided on inner and outer manhole frames;

FIG. 5 is an explanatory cross-sectional view of a main part of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole forming spacer 2, 3 Divided body 4 Hinge 5 Locking band 6 Locking member 9 Adjusting handle 10 Core rod 11a, 11b Semicircular hole 13 Open window 14 Formwork for manhole inner wall 15 Formwork for manhole outer wall 16 Contact Protrusion

Claims (1)

(57) [Claims] 1. A spacer disposed between a manhole outer wall formwork and a manhole inner wall formwork for forming a manhole wall, the outer ends of two substantially semi-cylindrical divided bodies are connected to each other by a hinge, In the vicinity of the other outer peripheral end, a locking band is formed in one of the divided bodies, a locking member and an adjustment handle are formed in the other divided body, and a core rod is inserted into a center portion of the diameter in approximately half. A manhole-forming spacer, wherein a circular hole is provided, a plurality of open windows are provided in each of the semi-cylindrical columns, and a plurality of abutting projections are formed on the outer periphery of each of the semi-cylindrical columns.