JPS583884Y2 - Side block for manhole - Google Patents

Description

[Detailed description of the invention] This invention relates to a manhole side block that is a construction member for manholes in water supply and sewerage systems, manholes in city gas, etc., manholes in buried telephone lines, power transmission lines, etc., and various other manholes.

Figure 1 shows the cross-sectional structure of a manhole in a sewer system that suffered a disaster due to a major earthquake. Manhole M is designed to have sufficient work space in the middle of pipe 1, which is made up of pipes such as humid pipes or PVC pipes. (hereinafter simply referred to as a square).

) 2 and a plurality of side blocks 3, 3... stacked on this square 2.
. . ., a manhole ring, and a lid, and the adhesive connection between the trench 2 and the side blocks 3 and the adhesive connection between the side blocks 3 and 3 is performed using cement mortar or the like.

Therefore, in the event of a major earthquake in which the ground shakes violently and buildings collapse, damage to the pipe 1, pipe 2, and side blocks 3, joint cracks at the joint surfaces of each member, and even displacement of the joint surfaces occur. It has been reported that.

If you suffer damage like this, you will have to start over completely.

In view of the above-mentioned points, this idea was developed to improve the earthquake resistance of the side blocks, which are the members that make up the manhole.It is a manhole that can increase the shear strength of the side blocks themselves and increase the stacking strength of the side blocks. It provides a useful mass.

According to the present invention, this purpose includes: a cylindrical side wall; a pair of flanges extending on the upper and lower outer peripheries of the side wall;
A manhole side block made of reinforced concrete or reinforced cement mortar having two or more reinforcing ribs protruding from the outer surface of the side wall portion connecting the pair of flanges, which is constructed by penetrating into the pair of flanges and the ribs. The reinforcing ribs have holes large enough to allow mortar to be filled around them through the reinforcing bars, and the reinforcing bars arranged in the reinforcing ribs are surrounded by a plurality of transverse bars that are connected to the reinforcing bars arranged in the side wall. ,
The horizontal strips are distantly related to the manhole side mass, which is characterized by consisting of vertical strips that connect vertical strips at positions surrounding the hole.

Hereinafter, embodiments of the manhole side block of this invention will be described with reference to the drawings.

FIG. 2 is a perspective view of a manhole side block called a straight wall, and FIG. 3 is a longitudinal sectional front view thereof.

Moreover, FIG. 4 is a perspective view of a side block for a manhole called a slanted wall, and FIG. 5 is a longitudinal sectional front view thereof.

The side block for a manhole of this invention has flanges 6.7 on the upper and lower outer peripheries of the cylindrical or tapered cylindrical side wall portion 5, and the side wall portion Two or more reinforcing ribs 8, 8, .

The above configuration is unchanged from the conventional one.

The invention particularly includes a hole 9 passing through the pair of flanges 6.7 and the rib 8.

The first point of the new component is that the hole 9 has a diameter large enough to allow the reinforcing steel for stacking to pass through and to fill the surrounding area with cement mortar.

This is because reinforcing ribs 8 are simply made of concrete or cement mortar, and simply reinforcing the side walls 5 and flanges 6.7 do not provide enough stacking connection strength. This is designed to increase the shear strength of the overlapping surfaces.

The present invention provides reinforcing bars 10 arranged within the reinforcing rib as the second point of the new component, and the reinforcing bars 10 surround the hole 9 and are arranged within the side wall 5. It consists of a plurality of arc-shaped horizontal stripes connected to the holes 9 and vertical stripes connecting the horizontal stripes vertically at positions surrounding the hole 9.

The purpose of providing such reinforcing bars 10 is to firmly reinforce the holes 9 in the reinforcing ribs 8.

The number of reinforcing ribs 8 is preferably 4, 6, or 8, and they are arranged at the outer periphery of the side wall 5.

The diameter of the hole 9 is not just large enough to allow reinforcing bars to pass through, but in order to ensure a strong connection between the reinforcing bars passed through the holes 9 and the side wall of this invention during stacking, the diameter of the holes 9 must be set so that the reinforcing bars can be passed through the holes 9. Through
Furthermore, it needs to be large enough to be filled with cement mortar, etc. around it.

With this configuration, it is possible to share and resist the shearing force generated at the joint surface of the side wall where the reinforcing bars passed through the holes 9 are stacked during an earthquake.

In the manhole side block called a slanted wall in FIGS. 4 and 5, a hole 12 is provided in the lower flange 7.

Next, a method of constructing a manhole in a sewerage system or the like using the manhole side block having the above-described structure and an effect that the manhole side block causes during an earthquake will be explained.

The manhole shown in FIG.
4 and 15 are stacked one after another, and one inclined wall 16 is further stacked.

Before stacking the straight walls 14, reinforcing bars 17 are planted or inserted upright.

This reinforcing bar 17 is passed through the hole 9 in the side block, and the straight wall 14
The box 13 is bonded with cement mortar or the like, and the inside of the hole 9 is filled with cement mortar or the like around the reinforcing bar 17 passed through the hole 9.

Next, the straight wall 15 and the inclined wall 16 are sequentially stacked in the same manner.
Finally, a manhole cover receiving frame or manhole ring 18 is provided so as to be flush with the road surface G.

When constructed in this way, when an earthquake occurs and the ground shakes and horizontal shearing force is applied to the soil, the joint surface between the box 13 and the straight wall 14, the joint surface between the straight wall 14 and the straight wall 15, the straight wall 15 In response to the respective shear forces applied to the joint surfaces of the slope walls 16 and 16, the reinforcing bars 17 are
Since the shearing force is applied and resisted, there is no risk of misalignment at each joint surface as in the conventional case.

In addition, in order to withstand the shearing force applied to the straight walls 14, 15 and the inclined wall 16, reinforcing ribs 8 with reinforcing bars are provided on the straight walls and the inclined walls themselves. Since the reinforcing bars 17 are passed through the reinforcing bars 17, the reinforcing ribs 8 and the reinforcing bars 17 resist the shearing force compared to the conventional side blocks, so there is no risk of cracking as in the conventional side blocks.

The manhole shown in FIG.
9 and 20 are stacked on top of each other, and there is no particular difference from the method of constructing the manhole shown in Figure 6.

Nuts 21 are attached to the reinforcing bars 17 in order to fix the second stage inclined wall 20.
It is best to fasten the reinforcing bars or bend the reinforcing bars at the top.

The manhole shown in Fig. 8 is constructed by stacking two or more straight walls 14, 15... and an inclined wall 16, similar to the manhole shown in Fig. 6. It can be applied to manholes, and if thick reinforcing bars 17 are used in consideration of earthquake damage, etc., they will not bend easily, so the reinforcing bars 17 should not be passed through the holes provided in the reinforcing ribs 8 of the slanted walls 16, but rather be placed on the underside of the slanted walls 16. It is passed through a hole drilled in the flange and fastened with a nut or the like 21.

As explained above, the manhole side block of this invention has a structure in which reinforcing ribs are provided on the outside of the side wall to connect the upper and lower flanges. The side block itself has a structure in which a hole of the required diameter is provided to allow the reinforcing steel for construction to pass through, and to be filled with cement mortar. It has sufficient strength, and when constructed, it has the effect that even if a large earthquake occurs, the joint surfaces of the side blocks will not shift, and the side blocks will not crack.

In other words, since the reinforcing bars can be passed through the holes in the reinforcing ribs and filled with cement mortar, the shear strength of the integrated reinforcing bars is significantly greater than in a structure where the reinforcing bars are simply passed through and tightened by screwing nuts onto the screws above and below the reinforcing bars. can.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view to explain the damage caused by a large earthquake to a conventional manhole, Fig. 2 is a perspective view of a manhole side mass called a straight wall according to this invention, and Fig. 3 is the same as Fig. 2. 4 is a perspective view of a manhole side block called a slanted wall according to this invention; FIG. 5 is a longitudinal sectional view of the slanted wall in FIG. 4; FIGS. 6, 7, and FIG. 8 is a longitudinal sectional view of a manhole constructed using straight walls and slanted walls according to this invention. 5...Side wall part, 6,7...Flange,
8... Reinforcement rib, 9... Hole.

Claims (1)

[Scope of utility model registration request] It has a cylindrical side wall, a pair of flanges extending to the upper and lower outer peripheries of the side wall, and two or more reinforcing ribs protruding from the outer surface of the side wall connecting the pair of flanges. A side block for a manhole made of reinforced concrete or reinforced cement mortar, which has a hole that penetrates through the pair of flanges and the rib and is large enough to fill the surrounding area with mortar through the construction reinforcing bar, and the reinforcing rib is arranged within the reinforcing rib. The reinforcing bars for manholes include a plurality of horizontal bars that surround the hole and are connected to reinforcing bars arranged in the side wall portion, and vertical bars that vertically connect the horizontal bars at positions surrounding the hole. Lateral mass.