JPH0786241B2 - Manhole and its invert holding member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a manhole formed by stacking tubular bodies on a bottom block having an invert portion on the bottom surface and an invert holding member for the manhole. By combining the outer cylinder member and the invert holding member having the invert portion on one surface, the work of laying and assembling the manhole and connecting the external pipe can be facilitated.

<Prior Art> As is well known, conventional manholes have a bottom block, a straight wall block, and a sloping wall block on a substrate in order to improve the convenience, speed, and installation stability of the laying work. It is designed to be built by sequentially stacking etc.
FIG. 9 is a partial recessed perspective view of a conventional manhole. In the figure, 1 is a concrete substrate, 2 is a bottom block having a bottomed cylindrical shape, 3 is a cylindrical straight wall block, 4 is an inclined wall block, 5 is a lid, and these are sequentially stacked to form a manhole as a whole. Are configured.

The bottom block 2 constitutes a sewage basin, and
As shown in FIG. 10, pipe joint portions 61 and 62 for connecting the inflow side outer pipe 71 and the outflow outer pipe 8 and the pipe joint portion
An invert portion 63 communicating with 61 and 62 is provided. First
In FIG. 10, reference numeral 9 is a stone, 72 is another external pipe connected to the external pipe 71, and a shows the inflow direction of sewage.

<Problems to be Solved by the Invention> However, in the conventional manhole, the bottom block 2 is a molded body integrally provided with the pipe joint portions 61, 62 and the invert portion 63, as shown in FIG. Therefore, there were the following problems.

(A) At the stage of connecting the external pipe 71, the manhole and the external pipe 72 are fixed at predetermined positions, and the distance d1 between them is a fixed size. On the other hand, in order to complete the pipe connection, the length l1 of the external pipe 71 must be larger than the distance d1. As mentioned above, the distance d1
External pipe 72 fixed to and manhole pipe fitting 61
It is inherently extremely difficult to insert and connect the external pipe 71 having a length l1 larger than the distance d1 between the two 72-61 or 62 or 62.

(B) In order to alleviate the above-mentioned work difficulties, external piping 71
If the length l1 of is shortened within the range exceeding the distance d1,
A gap is created at the joint end surface between the external pipes 71 and 72 and the pipe joint portion 61 or 62, and dirt, dust, and the like accumulate, causing a flow obstacle.

(C) Manhole fittings 61, 62 and external piping 71, 72
If there is a rotational displacement in the plane between and, the external pipe 71 may be unable to be connected to the pipe joint portions 61 and 62. If such a situation is reached, it will be necessary to redo the piping work for the external pipes 71 and 72 or change the installation position of the manhole.

(D) If it is found that the number of pipe fittings in the manhole is different from the number of external pipes to be connected after the manhole is once installed, the manhole once installed should be replaced with another appropriate manhole. There is also the problem of having to replace it and discard the entire old manhole.

Therefore, an object of the present invention is to solve the above-mentioned conventional problems, and to provide a manhole and an invert holding member having extremely high adaptability to laying, assembling, pipe connection or pipe change.

<Means for Solving the Problems> In order to solve the problems described above, the manhole according to the present invention is
It is configured by stacking tubular bodies on a bottom block having an invert portion on the bottom surface, and the bottom block includes a combination of an outer tubular member and an invert holding member arranged in the outer tubular member. The outer cylinder member has a pipe joint portion for external pipe connection, the invert holding member has an invert portion on one surface, the invert portion comes to a position corresponding to the pipe joint portion. Thus, it is arranged in the outer cylinder member and is joined to the outer cylinder member by the joining material filled between the outer peripheral surface of the invert holding member and the inner peripheral surface of the outer cylinder member.

The invert holding member further has a recess and a height adjusting mechanism at 3 to 4 positions on the outer peripheral surface. Each of the recesses is formed by cutting out the outer peripheral surface and reaches the other surface side from the one surface side.

Each of the height adjusting mechanisms includes a receiving plate and a screw, and is arranged inside the recess. The receiving plate is made of a metal material, the edge is integrally embedded inside the invert holding member, and is arranged so as to cross the recess, and the outer peripheral edge is slightly inside the outer peripheral surface of the invert holding member. Is located in. The screw is threadedly connected to the receiving plate, penetrates through the receiving plate, and is guided from the one surface side to the other surface side of the invert holding member.

<Operation> The bottom block includes a combination of an outer cylinder member and an invert holding member arranged in the outer cylinder member, and the outer cylinder member is
Since the invert holding member has the pipe joint portion for external pipe connection and the invert holding member has the invert portion on one surface, in the manhole assembling work, the invert holding member having the invert portion is replaced with the outer cylinder having the pipe joint portion. It can be separated from the component and carried out in a separate step. When connecting the external pipe, insert the external pipe into the pipe joint before placing the invert holding member inside the external cylinder member, and introduce the end portion into the empty internal space of the external cylinder member. Can be connected by pushing in the direction of other external piping. Therefore, the external pipe connecting work becomes easy.

After the external pipe connecting work is completed, the invert holding member is inserted and arranged in the outer tubular member. The invert holding member has an invert portion on one surface, and is arranged inside the outer tubular member so that the invert portion comes to a position corresponding to the pipe joint portion. Therefore, the invert portion of the invert holding member communicates with the pipe joint portion and the external pipe.

If an in-plane rotational position shift occurs between the invert portion provided on the invert holding member and the pipe joint portion of the outer tubular member or the external pipe, the invert holding member is placed inside or outside the outer tubular member. The surface can be rotated for alignment. Therefore, even if the rotational position shifts, it is not necessary to redo the piping work of the external pipe, and it is not necessary to change the installation position of the manhole.

If it is found that the number of pipe joints of the manhole is different from the number of external pipes to be connected after the manhole is once installed, only the invert holding member needs to be replaced. There is no need to replace a manhole once installed with another appropriate manhole as in the past, and economic loss can be minimized.

The invert holding member further has concave portions reaching from the one surface side to the other surface side at 3 to 4 places on the outer peripheral surface, and inside the concave portion,
Since it has a height adjustment mechanism consisting of a backing plate and a screw, even if there is a height position deviation between the invert part and the pipe joint part, this position deviation can be easily done by the height adjustment mechanism. Can be resolved.

Since each of the recesses is formed by cutting out the outer peripheral surface of the invert holding member, the area required to form the recess for arranging the height adjusting mechanism is small, and the area available for forming the invert portion is small. Increase.

Moreover, the invert holding member is joined to the outer tubular member by the joining material filled between the outer peripheral surface and the inner peripheral surface of the outer tubular member, and each of the recesses is the outer periphery of the invert holding member serving as the joining surface. Since the surface is cut out, a continuous joining structure is formed in the recess and the gap between the outer peripheral surface of the invert holding member and the inner peripheral surface of the outer tubular member. Due to this continuous joining structure, the invert holding member is firmly joined to the outer tubular member, and a stable installation state can be maintained.

Since the outer peripheral edge of the receiving plate is located slightly inside the outer peripheral surface of the invert holding member, the inner peripheral surface of the outer tubular member and the receiving plate are inserted with the invert holding member inside the outer tubular member. A gap is created between the outer peripheral edge of the
The filling and filling of the bonding material is surely performed.

<Example> FIG. 1 is a partial front sectional view of a manhole according to the present invention. In the figure, the same reference numerals as those in FIG. 9 denote the same components. The bottom block 2 is an outer cylinder member 21.
And an invert holding member 22 arranged inside the outer cylinder member 21. The outer cylinder member 21 has a pipe joint portion 211 for connecting an external pipe for inflow and outflow at an appropriate position on the side wall portion. In the embodiment, the pipe joint portion 211 includes a spacer made of plastic, concrete, or the like.
23 is inserted, and the external pipe 71 is inserted and connected in the spacer 23. 24 and 25 are bonding materials such as mortar.

The invert holding member 22 has an invert portion 221 on one surface, and is arranged inside the outer cylinder member 21 so that the invert portion 221 comes to a position corresponding to the pipe joint portion 211. The boundary between the invert holding member 22 and the outer cylinder member 21 is filled and fixed with a joint sealing material such as mortar (not shown).

2 to 4 are views showing an example of the invert holding member 22. The invert holding member 22 shown in the embodiment is a molded product made of concrete, plastic, or the like, and has a disc shape as a whole. The invert portion 221 is provided on one of the opposing main surfaces. The invert portion 221 is not limited to the illustrated three-way path, and a known shape such as a straight path or a four-way path can be selected. Although illustration is omitted, it is also possible to make the shape as thin as possible by ensuring the thickness necessary to form the invert portion 221. Such a shape is particularly effective when the invert holding member 22 is a plastic molded product.

The invert holding member 22 has a concave portion (c) and a height adjusting mechanism at 3 to 4 positions on the outer peripheral surface (b). Each of the concave portions (c) is formed by cutting out the outer peripheral surface (b) and reaches from the one surface side where the invert portion 221 is provided to the other surface side. Each of the height adjustment mechanisms has a support plate 222-2.
24 and screws 225 to 227, and are arranged inside the concave portion (c). The receiving plates 222 to 224 are made of a metal material having a high mechanical strength, such as an iron plate, and their edges are integrally embedded in the invert holding member 22. The outer peripheral edges (a) of the receiving plates 222 to 224 are located slightly inside the outer peripheral edge (b) of the invert holding member 22.

Next, with reference to FIG. 5 to FIG. 8, one example of a manhole assembling process and an external pipe connecting process according to the present invention will be described.

In connection with the external piping, as shown in FIG. 5, before the invert holding member 22 is arranged inside the outer tubular member 21, the external piping 71 is inserted into the pipe joint portion 211, and the end portion 711 thereof is inserted. Is introduced into the inner space 212 of the outer tubular member 21 as indicated by the arrow b. Thereby, between the external pipe 72 and the external pipe 71,
A sufficient clearance L1 is secured. In the present invention, the bottom block 2 is a combination of the outer cylinder member 21 and the invert holding member 22 arranged in the outer cylinder member 21,
It is possible to take the above-mentioned assembly process. The external pipe 71 is preferably arranged before the external pipe 72 is laid.

The pipe joint portion 211 of the outer cylinder member 21 may be formed by installing a hole in the outer cylinder member 21 with a cutter after the outer cylinder member 21 is installed and aligned with the position of the external pipe 72. In the example,
Since the spacer 23 is inserted into the pipe joint portion 211, the side wall of the outer tubular member 21 can be thinned to facilitate the drilling work.

Next, as shown in FIG. 6, as shown by an arrow C, the external pipe 71 is pulled out in the direction of the external pipe 72 and both 71-72 are connected. Thereby, the external pipe 71 and the external pipe 72 can be easily connected.

After the external pipe connecting work is completed as described above, as shown in FIG. 7, the invert holding member 22 is inserted and arranged in the outer cylinder member 21. The invert holding member 22 has an invert portion 221 on one surface, and the invert portion 221 is the pipe joint portion 21.
It is arranged in the outer cylinder member 21 so as to come to a position corresponding to 1. As a result, the invert portion of the invert holding member 22
221 comes to communicate with the pipe joint portion 211 and the external pipe 71.

If an in-plane rotational displacement occurs between the invert portion 221, the pipe joint portion 211, and the external pipe 71, the invert holding member 22 can be rotated in the plane for alignment. Therefore, even if the rotational position shifts, it is not necessary to redo the piping work of the external pipe 71, and it is not necessary to change the installation position of the manhole.

Once the manhole is installed, the manhole fitting
If it is found that the number of 211 and the number of external pipes 71 to be connected are different, only the invert holding member 22 needs to be replaced. It is not necessary to replace the manhole once installed with another appropriate manhole as in the conventional case.

Further, as shown in FIGS. 2 to 4, the invert holding member 22 has a height adjusting mechanism composed of receiving plates 222 to 224 and screws 225 to 227 at 3 to 4 places near the outer periphery. Therefore, even if a height positional deviation occurs between the invert portion 221 and the pipe joint portion 211, this positional deviation can be easily eliminated by the height adjusting mechanism.

Next, as shown in FIG. 8, the external pipe 71 and the pipe joint portion 211
While joining with the joining material such as mortar,
The interface between the outer cylinder member 21 and the invert holding member 22 is filled with the same bonding material and fixed by adhesion.

Here, each of the recesses (C) is an invert holding member.
Since the outer peripheral surface (b) of 22 is cut out, the area required for forming the concave portion (c) for arranging the height adjusting mechanism is small, and it can be used for forming the invert portion 221. The area increases.

Moreover, the invert holding member 22 is formed by the joining material filled between the outer peripheral surface (b) and the inner peripheral surface of the outer cylindrical member 21.
Since each of the concave portions (c) is formed by cutting out the outer peripheral surface (b) of the invert holding member 22 which is a joint surface, A continuous joining structure is formed in the gap between the inner peripheral surface of the outer tubular member 21 and the inside of the concave portion (C).
Due to this continuous joining structure, the invert holding member 22 is firmly joined to the outer tubular member 21, and a stable installation state can be maintained.

The invert holding member 22 has the outer peripheral edges (a) of the receiving plates 222 to 224 located slightly inside the outer peripheral surface (b) of the invert holding member 22.
In the state in which is inserted into the outer tubular member 21, a gap is created between the inner peripheral surface of the outer tubular member 21 and the outer peripheral edges of the receiving plates 222 to 224, and the filling and filling of the bonding material is surely performed through this gap. To be done.

<Effects of the Invention> As described above, according to the present invention, the following effects can be obtained.

(A) It is possible to provide a manhole that facilitates external pipe connection work.

(B) When an in-plane rotational position shift occurs between the invert portion and the external pipe, the invert holding member 22 can be rotated in the plane to perform the alignment, so that the rotational position shift occurs. Even in such a case, there is no need to redo the piping work of the external piping or change the manhole installation position, and it is possible to provide a manhole in which the external piping connection work and the installation work are easy.

(C) If it is found that the number of pipe joints of the manhole and the number of external pipes to be connected are different after the manhole is once installed, it is sufficient to replace only the invert holding member 22. It is possible to provide a manhole that is easy to change and has a high economical efficiency that can reduce the cost at the time of change.

(D) Even if a height position shift occurs between the invert part and the pipe joint part, this position shift can be easily eliminated by the height adjusting mechanism.

(E) The area required for forming the recess for arranging the height adjusting mechanism is small, and the area available for forming the invert portion is increased.

(F) Since the continuous joint structure is formed in the gap between the outer peripheral surface of the invert holding member and the inner peripheral surface of the outer tubular member and inside the recess, the invert holding member is firmly joined to the outer tubular member. , Can maintain stable installation condition.

(G) With the invert holding member inserted inside the outer tubular member, a gap is created between the inner peripheral surface of the outer tubular member and the outer peripheral edge of the receiving plate, and the filling and filling of the bonding material is performed through this gap. Definitely done.

[Brief description of drawings]

FIG. 1 is a sectional view of a manhole according to the present invention, and FIG. 2 is an invert holding member used for the manhole according to the present invention.
22 is a plan view, FIG. 3 is a front view of the same, FIG. 4 is a front sectional view of the same, and FIGS. 5 to 8 are views showing an example of a manhole laying work step according to the present invention, and FIG. FIG. 10 is a perspective view of a part of a conventional manhole (C), and FIG. 10 is a partially broken view of the main part in the same use state. 2 …… Bottom block, 21 …… Outer cylinder member 22 …… Invert holding member 22 211 …… Pipe joint part 221 …… Invert part

Claims (2)

[Claims] 1. A manhole constructed by stacking tubular bodies on a bottom block having an invert portion on the bottom surface, wherein the bottom block is an outer tubular member and an invert member disposed in the outer tubular member. Including a combination with a holding member, the outer cylinder member has a pipe joint portion for external pipe connection, the invert holding member has an invert portion on one surface, the invert portion is the pipe It is arranged in the outer tubular member so as to come to a position corresponding to the joint portion, and is joined to the outer tubular member by a joining material filled between the outer peripheral surface of the invert holding member and the inner peripheral surface of the outer tubular member. The invert holding member further has a recess and a height adjusting mechanism at 3 to 4 positions on the outer peripheral surface, and each of the recesses is formed by cutting out the outer peripheral surface, and the one surface side From the other side And each of the height adjusting mechanisms includes a receiving plate and a screw and is disposed inside the recess, the receiving plate is made of a metal material, and an edge thereof is integrated inside the invert holding member. And is arranged so as to cross the concave portion, the outer peripheral edge is located slightly inside the outer peripheral surface of the invert holding member, and the screw is screwed to the receiving plate and penetrates. , A manhole guided from the one surface side to the other surface side of the invert holding member. 2. An invert holding member for a manhole, which is arranged in an outer cylinder member and constitutes a bottom block together with the outer cylinder member, and which has an invert portion on one surface and has a recess at three to four places on the outer peripheral surface. And a height adjusting mechanism, each of the recesses is formed by cutting out the outer peripheral surface, reaches from the one surface side to the other surface side, each of the height adjusting mechanism, The support plate includes a receiving plate and a screw and is disposed inside the recess. The receiving plate is made of a metal material, and an edge thereof is integrally embedded inside the invert holding member and crosses the recess. The outer peripheral edge is located slightly inside the outer peripheral surface of the invert holding member, the screw is threadedly coupled to the receiving plate and penetrates, from the one surface side of the invert holding member. Other than the above Manhole for inverting holding member which is guided to the side.