JPH0649857A - Manhole lid and its manufacture - Google Patents

Abstract

PURPOSE:To enhance the appearance of manhole by interposing a coil spring between indication pieces, which are placed on a base plate and coupled together, and a manhole frame fixed to the base plate, and filling inside of the manhole frame with concrete. CONSTITUTION:A plurality of indication pieces 1 are furnished to indicate the name, emblem, etc., of authority in charge, purpose of installation, and so on, and the rear surfaces of these pieces 1 are coupled together by coupling arm(s) 6, to form a nameplate 7. which is placed on a base plate 2. A manhole frame 3 is fixed onto this base plate 2 using a vise 4, and a coil spring 8 is interposed between a lattice 3a at the bottom surface of the manhole frame 3 and the nameplate 7. Concrete 5 is poured inside of the frame 3 from over the lattice 3a, and the base plate 2 is excited upon a vibrating machine to promote uniform filling of the concrete 5. Thereby each piece of the nameplate is prevented from dislocation, and drop in appearance is precluded because the coupling arm is not exposed at the lid surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole cover mainly made of a pouring material such as concrete for closing a manhole which is an entrance and exit to an underground cavity for containing sewer, electric wires, communication cables and the like, And a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a manhole cover for covering a manhole in an underground cavity as described above,
It is usual to display the display object 1 such as the manager's mark 1a of the facility in the underground cavity, the manager's name 1b, and the installation purpose 1c of the manhole installation place on the surface.

When the main body of the manhole cover is formed by pouring concrete or the like, as shown in FIG. 7, the above-mentioned display objects 1 are cast separately from each other.
The base plate 2 at a predetermined position on the upper surface of the base plate 2 and
The manhole frame 3 that forms the outer circumference of the manhole cover is placed on top of the manhole cover, and the base plate 2 and the manhole frame 3 are sandwiched and fixed by the vise 4.

Then, the bottom surface of the manhole frame 3 is formed,
When the manhole frame 3 is fixed to the base plate 2, concrete 5 is poured into the manhole frame 3 from the lattice-shaped frame 3a that is the upper surface, and the poured concrete 5 is spread over the manhole frame 3 evenly. Apply vibration to 2 and wait for concrete 5 to solidify, then place vise 4 on base plate 2
The completed manhole cover and the base plate 2 are separated from each other.

When viewed from the surface, the manhole cover thus formed is filled with the cast product 1 at a predetermined position, the cast manhole frame 3 at the outer periphery, and the concrete 5 between them. It is in a closed state.

[0006]

In the conventional manhole cover mainly made of such a pouring material as concrete, the display object 1 placed on the base plate 2 is pushed by pouring concrete 5 or the like. However, there is a drawback that the concrete 5 is moved by vibration for uniformly spreading the concrete 5 into the manhole frame 3 and is displaced from a predetermined position.

The present invention is to solve the above-mentioned problems of the conventional manhole cover formed by pouring concrete or the like, and is the mark 1a of the facility manager in the underground cavity displayed on the surface of the manhole cover. An object of the present invention is to provide a manhole cover in which display objects 1 such as a manager name 1b and an installation purpose 1c of a manhole installation place are installed at predetermined positions and at intervals, and a manufacturing method thereof.

[0008]

The present invention relates to a method of manufacturing a manhole cover for achieving the above-mentioned object. The manufacturing method includes a manager name, a manager mark and facility contents displayed on the surface of the manhole cover. Etc., a plurality of display objects that are displayed on the back side are connected by a connecting arm to form a connected display object, which is placed on the upper surface of the base plate and fixedly attached to the upper surface of the base plate with a fixing tool. Further, a urging member is installed between the manhole frame and the manhole frame, and a pouring material such as concrete is poured from the upper surface of the manhole frame.

The manhole cover of the present invention is a manhole cover manufactured by the above-described manufacturing method, and the manhole cover is a manager name displayed on the surface of the manhole cover.
Multiple display items that display the administrator mark, facility contents, etc.
Connected with a connecting arm on the back side to form a connected display object, the display object is exposed on the surface of the pouring material such as concrete poured into the manhole frame, and the connecting arm and the biasing member are embedded in the pouring material. It is characterized by.

[0010]

According to the method of manufacturing the manhole cover of the present invention, since the plurality of display objects are connected to each other by the connecting arms on the back side thereof, the relative positional relationship of the plurality of display objects is not changed and the connection is made. Since the arms are connected to each other on the back surface of each display object, the connection arms are embedded in the pouring material such as concrete and are not exposed on the surface of the manhole cover.

The connected display object placed on the base plate is
Since it is pressed against the base plate by an urging member installed between the manhole frame fixed to the base plate, it is pressed by the pouring force of the pouring material such as concrete, or the pouring material is placed inside the manhole frame. It is prevented from being moved by vibration for uniform filling, and does not move from a predetermined position.

[0012]

EXAMPLE An example of an embodiment of a method for manufacturing a manhole cover mainly made of concrete of the present invention will be described below with reference to FIGS. 1 and 2. The same parts as those of the conventional manufacturing method are designated by the same reference numerals. I am doing it.

In this manufacturing method, a plurality of display objects such as the manager's mark 1a of the facility in the underground cavity displayed on the surface of the conventional manhole cover, the manager's name 1b, the installation purpose 1c of the manhole installation place, etc. Reference numerals 1 and 1 are integrally formed by casting in advance as connection display objects 7 which are connected to each other at predetermined intervals by connection arms 6 on their back surfaces.

The connection display 7 is placed at a predetermined position on the base plate 2, and is the same as the conventional one, and the grid-like frame 3a on the bottom surface of the manhole frame 3 fixed by the vise 4 on the base plate 2. A spiral spring 8 is installed between them. When installing the spiral spring 8, a spring receiver 9 as shown in FIGS. 3A, 3B, and 3C is used. Lattice frame 3
It is desirable to interpose it with a so that the end of the spiral spring 8 does not come into direct contact with the lattice-shaped frame 3a.

This is because when the manhole cover is completed, the spring 8 breaks through the concrete 5 by the resilience of the spring 8 and projects outside the lattice-shaped frame 3a to remove the manhole cover from the manhole. This is to prevent damage.

In this way, after the connection display 7, the spiral spring 8, the spring receiver 9, and the manhole frame 3 have been set on the base plate 2, the concrete 5 is placed inside the manhole frame 3 from the upper part of the lattice-shaped frame 3a. The base plate 2 is placed on a vibrating machine after completion of the pouring, and vibration is applied to the vibrating machine so that the poured concrete 5 is poured into the manhole frame 3
Fill evenly inside.

When this pouring or vibration is performed, the connected display object 7
Are connected to each other on the back side by the connecting arm 6,
The space between the display objects 1 does not fluctuate when pushed by the pouring force of the concrete 5, and since it is pressed against the base plate 2 by the helical spring 8, it does not move from its set position. , Keep it in the set position.

Although the manhole cover is completed by solidifying the poured concrete 5, the connecting arm 6, the spiral spring 8 and the spring receiver 9 are buried in the poured concrete 5 and exposed on the surface. Instead, wait for the concrete 5 to solidify, then place the vice 4 on the base plate 2
The manhole cover is removed from the base plate 2 and the completed manhole cover is separated from the base plate 2. Thus, the manhole cover in which the display object 1 is kept at a predetermined interval and position is obtained.

FIG. 3A used in the above embodiment.
In addition to the spring receiver 9 of FIG. 7, a spring receiver 9 as shown in FIGS. 7B and 7C can be used, and all of them show the spring receiver 9 used on the side of the lattice-shaped frame 3a. However, as shown in (d) and (e) of the same figure, an inner hollow cylindrical body 12a and a cylindrical body 12b are provided on the rear surface side of the central display object 1, and the spiral spring 8 is fitted thereto, or It is also possible to insert and bias the display object 1.

In the above embodiment, when the manhole cover is inclined between the front surface and the rear surface of the lattice-shaped frame 3a, the biasing force of the spiral spring 8 with respect to the connected display object 7 is transmitted unevenly. When there is a possibility that the connected display object 7 moves, the spring receiver 9 may have a spherical shape 9a as shown in FIG. 4, or the piano wire 11 may be planted on one surface of the spherical body 10 as shown in FIG. This is erected and supported by the lattice-shaped frame 3a, and a spherical concave portion 7a is provided on the back surface of the connected display object 7.

In this way, with respect to the linked display object 7,
It is desirable to always apply the biasing force of the spiral spring 8 and the piano wire 11 at a right angle, and to prevent the coupled display object 7 from being pushed to one side and displaced by the acting force due to the inclination of the biasing force.

[0022]

As described above, according to the present invention, since a plurality of display objects are connected by the connecting arm as described above, the distance between the display objects and the relative position of the display objects do not change, and the connecting arm is made of concrete. Since it is buried in the pouring material such as the like, it is not exposed on the surface of the manhole cover and the appearance of the manhole cover is not damaged.

Further, since the connecting indicator is pressed against the base plate by the biasing member during pouring of the pouring material or vibration for evenly filling the pouring material into the manhole frame, the pouring material is poured. This has the advantage of preventing the movement due to the momentum and the deviation due to vibration, and maintaining the predetermined set position.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a manufacturing method of the present invention.

FIG. 2 is a plan view of a linked display object.

3 (a), (b), (c), (d), and (e) are cross-sectional views showing various forms of a spring receiver.

FIG. 4 is a side view showing another form of the spring receiver.

FIG. 5 is a side view showing another form of the spring receiver.

FIG. 6 is a plan view of a conventional manhole cover mainly made of concrete.

FIG. 7 is a cross-sectional view showing a conventional method of manufacturing a manhole cover.

[Explanation of symbols]

 1 display object 2 base plate 3 manhole frame 3a lattice-shaped frame 5 concrete 6 connecting arm 7 connecting display object 8 spiral spring 9 spring receiver

Claims (2)

[Claims] 1. A plurality of display objects for displaying a manager's name, a manager's mark, facility contents, etc. displayed on the front surface of a manhole cover are connected by a connecting arm on the back side thereof to form a connected display object. It is placed on the upper surface of the board, and a biasing member is installed between the manhole frame fixedly attached to the upper surface of the base plate with a fixing tool, and pouring material such as concrete is poured from the upper surface of the manhole frame. A method of manufacturing a characteristic manhole cover. 2. A manhole frame is formed by connecting a plurality of display objects, such as a manager's name, a manager's mark, facility contents, etc., which are displayed on the front surface of the manhole cover, with a connecting arm on the back side thereof. A manhole cover characterized in that a display arm is exposed on the surface of a pouring material such as concrete poured into, and a connecting arm and a biasing member are embedded in the pouring material.