JPS6220524Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a manhole cover receiving frame fixing structure.
In particular, the present invention relates to an improvement in a manhole cover frame fixing structure in which a plurality of bolts are provided at the upper end of a peripheral wall block buried underground and the flange portion of the manhole cover frame is fastened with these bolts and nuts.

It is well known that manholes are constructed for the management, maintenance and inspection of various underground facilities including water and sewage systems.

This manhole has a structure in which a concrete surrounding wall block leading to underground equipment is buried underground, a manhole cover receiving frame is fixed to the upper end of this block, and an openable and closable manhole cover is attached to the receiving frame. ing. In this case, the peripheral wall block is usually made of a hollow cylindrical body made of concrete (such as a fume pipe), and is combined with a concrete adjustment ring as necessary to adjust the manhole cover to approximately the same level as the ground. It has a similar structure. Furthermore, in order to finely adjust the height or inclination of the manhole cover receiving frame with respect to the ground, an appropriate number of washers may be inserted between the surrounding wall block and the manhole receiving frame, and the bolts may be fastened through these washers. It is being done.

However, in the case of a conventional manhole cover receiving frame, a continuous full-circumference flange is provided around the periphery, and bolt insertion holes are formed in this flange portion at a predetermined pitch in the circumferential direction, that is, in accordance with the bolt pitch of the peripheral wall block. was. Therefore, when fixing the receiving frame to the surrounding wall block, the heavy receiving frame must be suspended and placed on the surrounding wall block with each hole and each bolt aligned.
There were problems in that positioning was difficult and required a lot of effort, and workability was poor. Furthermore, when adding or removing washers to finely adjust the height of the receiving frame, the receiving frame must be lifted and separated from the bolt each time, and this fine-tuning of the height also requires a great deal of effort. There was a problem.

The purpose of the present invention is to provide a fixing structure for a manhole cover receiving frame that solves the problems of the conventional technology and allows easy and safe positioning of the manhole cover receiving frame with respect to the surrounding wall block and fine height adjustment. It is to be.

The feature of the present invention is that the flange portion of the manhole cover receiving frame is formed by a plurality of flange sections divided at predetermined intervals corresponding to the bolt positions of the peripheral wall block, and each of the bolts is attached to the circumferential end face of each flange section. The above object is achieved by forming a bolt-fitting notch having a predetermined circumferential depth for receiving the bolt.

That is, according to the present invention, a manhole cover receiving frame fixing structure is provided in which a plurality of bolts are provided at the upper end of a peripheral wall block buried underground, and the flange portion of the manhole cover receiving frame is fastened with these bolts and nuts. In this method, the flange portion of the manhole cover receiving frame is formed by a plurality of flange sections divided at predetermined intervals corresponding to the position of the bolt, and a notch for bolt fitting is formed at the end of each flange section. A manhole cover receiving frame fixing structure is provided.

1 to 3 are diagrams showing one embodiment of the manhole cover receiving frame fixing structure according to the present invention, and FIG.
The drawings are diagrams showing other embodiments, and the present invention will be specifically described below based on these drawings.

1 to 3, a plurality of bolts 2 are provided on the upper surface of a peripheral wall block 1 buried underground, and the manhole cover receiving frame 3 has its flange portion 4 screwed from these bolts 2 and the upper surface. The surrounding wall block 1 is tightened by tightening nuts 5.
is fixed. A manhole cover 6 that can be opened and closed from the ground is attached to the manhole cover receiving frame 3.

The peripheral wall block 1 forms a space communicating with various underground facilities such as water supply and sewerage systems such as water stop valves, and is usually formed of a hollow cylindrical body made of concrete or synthetic resin, such as a hump pipe. The illustrated peripheral wall block 1 has a structure in which a main body 1A such as a fume pipe is combined with an adjustment ring 1B made of concrete or synthetic resin, and the manhole cover 6 is brought to approximately the same level as the ground 7 by this adjustment ring 1B. It is designed to hold. This concrete adjustment ring 1B is used as needed, and is not used when the main body 1A alone can hold the manhole cover 6 at substantially the same level as the ground 7.

Peripheral wall block 1 (in the example shown, adjustment ring 1
B) is embedded with a plurality of bolts 2 for fixing the receiving frame, which protrude upward from positions at predetermined intervals in the circumferential direction. Note that this peripheral wall block 1 can have various structures, and the main body 1A can be of a split type, and the bolt 2 can be installed in the uppermost main body, and the adjustment ring 1B can be inserted in the middle. .

The flange portion 4 of the manhole cover receiving frame 3 is
As shown in Figure 1, multiple pieces (six pieces in the example shown)
It is formed of a plurality (six) of flange sections 8 divided at predetermined intervals corresponding to the positions of the bolts 2 . A notch 9 is formed in the circumferential end face of each flange section 8 to fit each of the bolts 2 . Each notch 9 is formed with a predetermined circumferential depth suitable for receiving each bolt 2. Each flange section 8 is provided with a rib 10 for reinforcing the manhole cover receiving frame 3 itself and each flange section 8.

The flange portion 4 of the receiving frame 3 and the peripheral wall block 1
(In this example, the adjusting ring 1B is made of concrete or synthetic resin).
As shown in the figure, a desired number of washers 11 for fine height adjustment are inserted, and the receiving frame 3 is fixed by the nut 5 through these washers. Also, by inserting these washers 11 into the bolts 2, a gap is created between the flange portion 4 and the peripheral wall block 1, and this gap is filled with mortar 12. Said washers 1
1 is for finely adjusting the height and inclination of the receiving frame 3 in order to finely adjust the upper surface of the manhole receiving frame 3 and the manhole cover 6 attached thereto to the same level with the ground 7. A desired number of sheets (in some cases, 0 sheets) are inserted and used at each location.

Next, the construction procedure of the manhole cover receiving frame fixing structure explained above will be explained.

After a main body 1A such as a fume pipe is buried in the ground, an adjustment ring 1B for height adjustment is connected thereon to construct a peripheral wall block 1. Next, peripheral wall block 1
The desired number of washers 1 for fine height adjustment are placed on the upper end of the
A manhole cover receiving frame 3 is installed with the manhole cover receiving frame 3 interposed therebetween. In this case, the receiving frame 3 is slid on the peripheral wall block 1, and each bolt 2 is fitted into the notch 9 of the flange portion 4 and positioned. After each bolt 2 is fitted into each notch 9, the manhole cover receiving frame 3 is fixed onto the peripheral wall block 1 by screwing the nuts 5 into each bolt 2 and tightening these nuts. Thereafter, the gap between the receiving frame 3 and the peripheral wall block 1 is filled with mortar 12, and the space at the cutout between each flange section 8 is also filled with mortar 12. After filling with mortar in this manner, backfilling with soil is performed, and after the backfilling soil is stabilized, mortar is filled around the manhole cover receiving frame 3 and joints are provided to complete the construction.

According to the embodiment described above, after the manhole cover receiving frame 3 is placed on the peripheral wall block 1, each bolt 2 and each notch 9 are fitted into each other and positioned while sliding on the peripheral wall block 1. Therefore, the work of assembling the manhole cover receiving frame 3 to the peripheral wall block 1 can be performed extremely easily. Also, when finely adjusting the height of the manhole cover receiving frame 3, the washer 11 should be installed and removed using the receiving frame 3.
This can be done by simply sliding and shifting the position without separating it from each bolt 2.
Fine adjustment of the height of the receiving frame 3 using the washers 11 can also be performed very easily.

Furthermore, the manhole cover receiving frame 3 and the surrounding wall block 1
The mortar 12 filled in the gap between the receiving frame 3 and the mortar 12 is integrally filled not only under the receiving frame 3 but also in the space of the cutout between each flange section 8. The bonding strength of the mortar can be greatly improved, thereby improving the strength of the mortar. In this way, the vibration resistance and impact resistance of the mortar 12 can be greatly improved.

Furthermore, since the mounting flange portion of the manhole cover receiving frame 3 is formed of a plurality of flange sections 8 divided at predetermined intervals, it is possible to reduce the weight and cost of the manhole cover receiving frame 3 regardless of the strength of the flange portion. be able to.

FIG. 4 is a diagram showing another embodiment of the present invention,
In this embodiment, notches 9 for bolt fitting are formed at both ends of each of a plurality of flange sections 8 divided at predetermined intervals, and the notches 9 are provided only at one end of each flange section 8. Figures 1 to 3
This embodiment differs from the illustrated embodiment only in this respect, and other parts have substantially the same structure. Therefore, corresponding parts will be indicated by the same reference numerals and detailed explanation thereof will be omitted.

In the embodiment shown in FIG. 4, the manhole cover support frame 3 is fixed to the surrounding wall block 1 buried underground in the same manner as in the embodiments shown in FIGS. 1 to 3. Therefore, similar effects can be achieved compared to the conventional technology.

As is clear from the above explanation, according to the present invention, the flange portion of the manhole cover receiving frame is formed into a plurality of flange sections divided at predetermined intervals corresponding to the positions of the bolts for fixing the receiving frame, and each Since a notch for bolt fitting is formed at the end of the flange section, the manhole cover allows assembly of the manhole cover receiving frame to the surrounding wall block and height adjustment of the manhole cover receiving frame to be performed extremely quickly and easily. A receiving frame fixing structure is obtained.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the shape of the manhole cover receiving frame itself in an embodiment of the manhole cover receiving frame fixing structure according to the present invention, and Fig. 2 is a state in which the manhole cover receiving frame shown in Fig. 1 is fixed on the surrounding wall block. A vertical sectional view taken along the line - in Figure 1, Figure 3.
The figure is a partial vertical sectional view of the fixing structure shown in FIG. 2 taken along the line - in FIG. 1, and FIG. 4 is a manhole cover holder used in another embodiment of the manhole cover holder frame fixing structure according to the present invention. It is a top view showing a frame. 1... Peripheral wall block, 1A... Main body part (peripheral wall block), 1B... Adjustment ring (peripheral wall block), 2... Bolt for fixing the manhole cover receiving frame, 3... Manhole cover receiving frame, 4... Flange Part, 5...Natsuto, 6...Manhole cover, 7...
Ground, 8... Flange division, 9... Notch for bolt fitting, 11... Washer for fine height adjustment, 1
2...Mortar, 13...Cut between flange sections.

Claims (1)

[Scope of utility model registration request] A manhole cover receiving frame fixing structure in which a plurality of bolts are installed on the upper end surface of a peripheral wall block buried underground, and the flange portion of the manhole cover receiving frame is fastened to the peripheral wall block with these bolts and nuts. The flange portion of the manhole cover receiving frame is formed of a plurality of flange sections divided at predetermined intervals in the circumferential direction corresponding to the positions of the respective bolts, and each of the flange sections is formed on the circumferential end surface of each flange section. A manhole cover receiving frame fixing structure characterized by forming a bolt-fitting notch having a predetermined circumferential depth for receiving a bolt.