JP2009194987A - Handhole, construction method thereof and bellmouth block - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight handhole exhibiting excellent workability and refractriness, and having no risk of collapsing a bellmouth during construction, and to which the same bellmouth can be applied even if the thickness of wall is different. <P>SOLUTION: Blocks 17a and 17b can slide along a tube 15. Consequently, the distance between the blocks 17a and 17b can be varied freely. A fixing member 21a is installed to straddle grooves 19a and 19b. Since the fixing member 21a is installed, the distance between the blocks 17a and 17b is fixed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a hand hole that can be easily constructed and can cope with different wall thicknesses and laying conditions, a hand hole construction method, and a bell mouth block used for the hand hole.

Conventionally, when laying cables such as power cables, a plurality of cable protection tubes are laid together in a cable groove or the like. In order to lay and check these cables, hand holes are provided at predetermined intervals. The hand hole is mainly made of concrete, and a bell mouth is installed at the end of the cable protection tube for drawing the cable.

As a method for forming such a hand hole, there is a method in which a bell mouth is previously installed in a hand hole mold and formed integrally, or a method in which a hole is formed after hand hole formation and a bell mouth is installed. . However, in order to construct hand holes efficiently at the site, there is a method in which bell mouth blocks are pre-cured with mortar, etc. May be adopted.

As a method for forming a hand hole using a bell mouth block, for example, a bell mouth block made of concrete is used, and a plurality of (a plurality of types) bell mouth blocks are applied and stacked with mortar, etc. There is a method of providing a side wall (Patent Document 1).

In addition, using a bell mouth block made of rigid polyurethane foam, while providing projections and recesses on the top and bottom surfaces of the bell mouth block, and through holes penetrating in the vertical direction, when the bell mouth blocks are stacked, There is a method in which a bell mouth block is prevented from collapsing and shifting by fitting a protrusion and a concave portion and a rod passes through a through hole, and a stacked bell mouth block is attached to a hand hole (Patent Document 2).

JP-A-11-108246 JP-A-9-144951

However, the construction method described in Patent Document 1 has a problem that the bell mouth block is made of concrete and is heavy and difficult to construct. Further, when the bell mouth blocks are stacked, mortar or the like is applied between the bell mouth blocks. However, it takes time until the mortar is hardened, and there is a problem that the bell mouth blocks may collapse during this time.

Further, the construction method described in Patent Document 2 is relatively light because the bell mouth block is made of hard foamed polyurethane, but because the bell mouth block is exposed in the hand hole, the fire resistance of the hand hole is inferior. There's a problem. In addition, there is an effect of preventing collapse by fitting protrusions and recesses or inserting a rod into the through hole, but there is no function of preventing displacement in the left-right direction, and there is a possibility that displacement may occur in the lateral direction. There is.

Furthermore, the wall thickness of the hand hole is determined according to specifications such as strength required for the hand hole, but the thickness of the bell mouth block is fixed by either method of Patent Document 1 or Patent Document 2. Therefore, when the bell mouth block is thicker than the wall thickness of the hand hole, the bell mouth block protrudes into the hand hole, and when the bell mouth block is thinner than the wall thickness of the hand hole Has a problem that the strength of the bell mouth block is inferior to that of the handhole wall. Therefore, there is a problem that it is necessary to manufacture a bell mouth block for each hand hole to be installed.

The present invention has been made in view of such problems, is lightweight and excellent in workability, has fire resistance, has no fear of collapse of the bell mouth block during construction, and has different wall thicknesses. It is an object of the present invention to provide a hand hole, a method for constructing a hand hole, and a bell mouth block used for the hand hole which can apply the same bell mouth block to the hand hole.

In order to achieve the above-described object, the first invention includes a step (a) for installing a first formwork, a pair of first and second blocks, and the first and second blocks. A tubular body and a bell mouth opening provided at an end of the tubular body on the second block side, wherein the first and / or the second block is in an axial direction of the tubular body. A step (b) of installing a slidable bell mouth block such that the bell mouth opening is in contact with the first formwork; and the first block from the end side of the first block of the tubular body. A step (c) of installing a second formwork so as to contact the block, a step (d) of placing concrete between the first formwork and the second formwork, and the first And (e) removing the second formwork and the second formwork, To be the case method.

In the step (b), it is desirable that the bell mouth blocks are provided in a plurality of stages and / or a plurality of rows, and a stopper is provided at a contact portion between the bell mouth blocks.

In this case, the slip stopper is a fixing member that fixes the distance between the first and second blocks, and the fixing member may be fitted into a groove provided in the first and second blocks. Alternatively, the slip stopper may be a concave portion and a convex portion provided in the first and second blocks, and the concave portion and the convex portion of the adjacent bell mouth blocks may be fitted to each other.

In the step (b), a gap may be provided between the first formwork and the second block.

According to the first invention, since the bell mouth block has a pair of blocks and the block is slidable, the same bell mouth block can be applied to a plurality of wall thicknesses. Since mortar or the like is not used for stacking, the construction time is shortened, and a handhole construction method with high workability can be obtained.

Moreover, if the bell mouth blocks are provided with a slip stopper, or a convex portion and a concave portion, there is no fear of the bell mouth collapsing, and if the slip stopper is used as a fixing member for fixing the distance between the blocks. The structure is simple and the workability is good. In addition, since there is a distance between the end face of the block and the surface of the hand hole, the bell mouth block does not burn even in a fire in the hand hole, and a hand hole construction method with excellent fire resistance is obtained. be able to.

According to a second aspect of the present invention, a plurality of bellmouth blocks and / or a plurality of rows of bellmouth blocks each including a pair of blocks, a tube passing through the pair of blocks, and a bellmouth opening provided at an end of the tube. It is a hand hole that is installed and the bell mouth block is embedded in concrete.

According to the second invention, since the bell mouth block has a pair of blocks, the same bell mouth block can be applied to a plurality of wall thicknesses, and mortar or the like is not used when stacking the bell mouth blocks. Therefore, the construction time is shortened and a handhole with high workability can be obtained.

3rd invention is a bell mouth block used when arrange | positioning a cable, Comprising: A bell mouth opening provided in a pair of block, the pipe body which penetrates the said block, and the said pipe body end A bell mouth block, wherein the block is slidable in an axial direction of the tubular body.

The block may further include a stopper that prevents the bell mouth blocks from being displaced from each other, and the stopper may be a fixing member that fixes a distance between the pair of blocks.

According to the third invention, since the bell mouth block has a pair of blocks and the block is slidable, the same bell mouth block can be applied to a plurality of wall thicknesses. Since no mortar or the like is used when stacking, the construction time is shortened and a bell mouth block with excellent handling properties can be obtained. Also, if the bell mouth blocks are provided with a stopper, there is no risk of the bell mouth collapsing, and if the stopper is used as a fixing member that fixes the distance between the blocks, the structure is simple and the construction A bellmouth block with good sex can be obtained.

According to the present invention, light weight, excellent workability, fire resistance, no risk of collapse of the bell mouth block during construction, and the same for hand holes having different wall thicknesses. It is possible to provide a hand hole to which the bell mouth block can be applied, a method for constructing the hand hole, and a bell mouth block used for the hand hole.

Hereinafter, the handhole 1 concerning embodiment of this invention is demonstrated. FIG. 1 is a diagram showing a handhole 1 according to the present embodiment.

The hand hole 1 includes a pair of side walls 1a and 1b. The side walls 1 a and 1 b are provided in the side groove 3. The side groove 3 is a groove provided in the vicinity of a side wall of a tunnel or the like, and a cable and a protective tube are laid. Side walls 5a and 5b are provided on the side portions of the side walls 1a and 1b. For example, the side wall 5 a is a side wall of the tunnel, and the side wall 5 b is a side wall of the side groove 3. In addition, the side groove 3 may be provided in the site | part where cables, such as a roadside, are installed even if it is not in a tunnel.

A plurality of bell mouth blocks 9 are embedded in the side walls 1a and 1b. The bell mouth block 9 is provided with a bell mouth opening 13 at one end. A tube body 15 is provided at the other end of the bell mouth block 9, and a joint 11 is provided at the tip of the tube body 15. The bell mouth opening 13 is an opening having a bell shape. Since the bell mouth opening 13 has a bell shape, it does not get caught when a cable or the like is inserted.

When installing a cable or the like, a protective tube of the cable is connected to the joint 11, and the cable or the like is installed through the tubular body 15 in the protective tube connected to the joint 11. The tube body 15 and the joint 11 are made of a resin such as polyethylene, for example, and the size and shape are determined according to the size of the cable passing through the inside.

The side walls 1a and 1b are provided to face each other so that the bell mouth openings 13 face each other. Accordingly, the bell mouth opening 13 is exposed in the hand hole 1, and a cable and the like are laid and inspected in the hand hole 1.

FIG. 2 is a perspective view of the bell mouth block 9. The bell mouth block 9 is mainly composed of a tubular body 15, blocks 17a and 17b, a joint 11, a fixing member 21 and the like.

The pair of tube bodies 15 penetrates the blocks 17a and 17b. As described above, the joint 11 is provided at the end of the tube body 15. Although not shown, a bell mouth opening 13 is provided at the other end of the tube body 15. The joint 11 to the bell mouth opening 13 communicate with each other internally, and a cable or the like is passed therethrough.

Grooves 19a and 19b are provided on the upper surfaces of the blocks 17a and 17b, respectively. The grooves 19a and 19b have a groove shape corresponding to the shape of the fixing member 21a described later, and are provided so as to face each other. Similarly, grooves 19c and 19d are provided on the side surfaces of the blocks 17a and 17b. In addition, the groove | channel 19 is similarly provided in all the upper and lower surfaces and both side surfaces of the blocks 17a and 17b.

The fixing members 21a and 21b are “I” -shaped members. In other words, the rod-shaped portion 22 has protrusions 24 provided at both ends of the rod-shaped portion 22 in a direction perpendicular to the axial direction of the rod-shaped portion 22.

The fixing member 21 is not limited to such a shape, and may have any shape as long as the rod-shaped portion 22 and the rod-shaped portion 22 have a protrusion 24 in the vertical direction in the vicinity of both ends of the rod-shaped portion 22. In other words, any shape may be used as long as it has the rod-like portion 22 that is positioned when installed in the blocks 17a and 17b and the protrusion 24 that determines the distance between the blocks 17a and 17b. If nuts are attached to both ends of the bolt so that the nut can be moved, fixing members having different lengths can be easily obtained.

As shown in FIG. 2A, the blocks 17 a and 17 b can slide along the tube body 15 in the direction of arrow A in the figure. Accordingly, the distance between the block 17a and the block 17b can be freely changed. It should be noted that both the blocks 17a and 17b may not necessarily slide, and only one of them may slide.

In addition, although illustration is abbreviate | omitted, it is desirable for the sliding surface of the pipe body 15 and the blocks 17a and 17b to give a water stop material. This is to prevent water in the ground from penetrating into the hand hole when water enters the gap between the blocks 17a, 17b and the tube body 15 and a bell mouth block 9 described later is buried with concrete. A rubber sheet or a water expansion sheet can be used as the water stop material.

As shown in FIG. 2B, the fixing member 21a is installed so as to straddle the grooves 19a and 19b. Similarly, fixing members 21b are provided on the side surfaces of the blocks 17a and 17b. By installing the fixing members 21a and 21b, the distance between the blocks 17a and 17b is fixed.

The thickness of the fixing member 21a is desirably thicker than the groove depth of the grooves 19a and 19b and thinner than twice the depth of the grooves 19a and 19b. That is, it is desirable that the fixing member 21a protrudes from the blocks 17a and 17b in a state where the fixing member 21a is installed in the grooves 19a and 19b, and the protrusion margin is lower than the depth of the grooves 19a and 19b. The same applies to the fixing member 21b.

In addition, if the fitting between the fixing member 21a and the grooves 19a and 19b is too strict, it is difficult to install the fixing member 21a. For example, if the fixing member 21a and the blocks 17a and 17b are made of resin, it is desirable because the deformation allowance of the resin can be used when fitting.

The bell mouth block 9 is manufactured as follows. The tube body 15 is inserted into the blocks 17a and 17b having holes corresponding to the tube body 15. When the tube body 15 is inserted, a water stop material is provided on the inner surfaces of the holes of the blocks 17a and 17b. After the tube body 15 is inserted into the pair of blocks 17a and 17b, a bell mouth is provided at the end of the tube body 15. A joint 11 is provided at the other end of the tube body 15. Thus, the bell mouth block 9 is formed.

In addition, each of the blocks 17a and 17b is formed in a halved shape, and the tubular body 15 is sandwiched between the halved blocks 17a and 17b, and then the halved portions of the blocks 17a and 17b are joined together by bonding or the like. good. Also in this case, a water stop material is provided in advance in a portion corresponding to the pipe body 15 of the divided blocks 17a and 17b. In any case, the pair of blocks 17 may be slidably attached to the tube body 15 and the space between the tube body 15 and the block 17 may be sealed. The blocks 17a and 17b are formed by injection molding, for example.

FIG. 3 is a side view showing a state in which the fixing member 21 is installed on the bell mouth block 9, and FIG. 3A shows a case where the inter-block distance 20a that is the inter-surface distance between the block 17a and the block 17b is long. FIG. As shown to Fig.3 (a), when the distance 20a between blocks is long, it is necessary to use the long fixing member 21b according to the distance 20a between blocks.

On the other hand, as shown in FIG. 3B, when the inter-block distance 20b is short, it is necessary to use a short fixing member 21c corresponding to the inter-block distance 20b. Here, the long fixing member 21b and the short fixing member 21c differ only in the length of the rod-shaped portion 22. That is, the shape of the protrusion 24 is a shape corresponding to the shape of the groove 19 and does not change.

Next, a method for stacking the bell mouth blocks 9 will be described. FIG. 4 is a diagram showing a state in which the bell mouth blocks 9a, 9b, 9c are stacked.

Fixing members 21d and 21e are respectively provided on the side surface and the upper surface of the bell mouth block 9a installed at the lowermost position. That is, the fixing member 21 is attached to all the grooves 19 other than the grooves 19e and 19f located on the lower surface of the bell mouth block 9a.

Next, the bell mouth block 9b is installed on the bell mouth block 9a. At this time, the fixing member 21e provided on the upper surface of the bell mouth block 9a is installed so as to be inserted into the groove 19 below the bell mouth block 9b. Therefore, the bell mouth blocks 9a and 9b are connected by the fixing member 21e, and there is no position shift or the like. Fixing members 21f and 21g are provided on the side and upper side of the bell mouth block 9b, respectively.

Further, the bell mouth block 9c is installed on the bell mouth block 9b. At this time, the fixing member 21g provided on the upper surface of the bell mouth block 9b is installed so as to be inserted into the grooves 19c and 19d below the bell mouth block 9c. Therefore, the bell mouth blocks 9b and 9c are connected to the grooves 19a and 19b and the grooves 19c and 19d by fitting the fixing member 21g. A fixing member 21h is provided on the side of the bell mouth block 9c.

In the case where the bell mouth blocks 9 are arranged side by side in the horizontal direction, the fixing member 21 is used in each groove 19 provided on the side surface where the blocks 17a and 17b of the adjacent bell mouth blocks 9 are in contact with each other. The bell mouth block 9 can be connected in the horizontal direction.

Next, the construction method of the handhole 1 will be described. First, as shown in FIG. 5, a mold frame 25 a is installed on the bottom 7 of the side groove 3. As shown in FIG. 5B, the mold 25a is provided so that each side of the mold 25a contacts the side walls 5a, 5b and the bottom portion 7 so as to block the entire side groove 3.

Next, as shown in FIG. 6, the bell mouth blocks are stacked. FIG. 6 shows an example in which bellmouth blocks 9a, 9b, 9c are stacked in three stages. As described above, the bell mouth blocks 9 are connected by the fixing members 21 provided above and below, respectively. That is, the bell mouth blocks 9a and 9b are connected by the fixing member 21e, and the bell mouth blocks 9b and 9c are connected by the fixing member 21g. Each bell mouth block 9a, 9b, 9c is adjusted to have a block-to-block distance 20 set by the side wall of the hand hole to be manufactured and fixed by a corresponding fixing member 21 before installation.

If the inter-block distance 20 of the bell mouth block 9 is fixed and the adjacent bell mouth blocks 9 are connected to each other, the other fixing member 21 is not necessarily required. For example, the uppermost fixing member 21i may not be installed if the bell mouth block 9 is not stacked further upward.

When the bell mouth blocks 9a, 9b, 9c are installed, the respective bell mouth openings 13 are installed in contact with the mold 25a. This is to prevent the concrete from entering the bell mouth when placing concrete, which will be described later.

Further, a block gap 27 is provided between the end face of each block 17b of the bell mouth blocks 9a, 9b, 9c and the mold 25a. This is because when the block 17b is made of a resin, the block 17b is exposed on the concrete surface if there is no block gap 27, so that there is a risk of burning in the event of a fire or the like.

The block gap 27 may be a gap that prevents the block 17b from being affected by heat in the event of a fire in the hand hole, and is preferably about 10 mm or more, for example. That is, when the bell mouth block 9 is installed, the distance between the outer surfaces of the block 17a and the block 17b is set narrower by the block gap 27 than the side wall thickness of the hand hole to be molded.

Next, as shown in FIG. 7, a mold 25b is provided. The mold 25b is provided so as to sandwich the blocks 17a and 17b with respect to the mold 25a. In order to avoid interference with the tube body 15 etc., the position corresponding to the tube body 15 etc. is hollowed out.

Fig.8 (a) is the figure which looked at the formwork 25b from the front. FIG. 8 shows an example in which a total of six bell mouth blocks 9 are arranged in three rows on the top and bottom and two rows horizontally.

The mold frame 25b has a U-shape in which portions such as the joint 11 are hollowed out in order to avoid interference with the tube body 15 and the joint 11 of the bell mouth block 9. The mold 25b is formed so as not to interfere with the joint 11 or the like and to form the block 17a and the lap portion 29. That is, as shown in FIGS. 7 and 8, a part of the mold 25 b comes into contact with the block 17 a of the bell mouth block 9 and comes into surface contact with the lap portion 29.

Next, as shown in FIG. 9, concrete 31 is placed in the gap between the molds 25a and 25b. In FIG. 9, the direction perpendicular to the paper surface is surrounded by side walls 5a and 5b (not shown). The blocks 17 a and 17 b of the bell mouth block 9 are embedded in the concrete 31.

Since the bell mouth opening 13 is in contact with the mold 25a, and the mold 25b and the block 17a are in surface contact with each other at the lap portion 29, the concrete 31 may leak from the molds 25a and 25b. Neither does it enter the bellmouth.

Next, as shown in FIG. 10, the molds 25a and 25b are removed. Through the above steps, the hand hole 1 is formed.

Thus, according to the construction method of the handhole concerning this Embodiment, the handhole 1 can be constructed easily. Further, the thickness of the bell mouth block 9 can be easily changed by changing the distance between the blocks 17a and 17b, and the same bell mouth block 9 can be used for hand holes having different thicknesses. For this reason, it is not necessary to manufacture a bell mouth block anew for every shape of a handhole. That is, for any hand hole having any wall thickness, the thickness of the installation position of the bell mouth block 9 does not change from the thickness of the installation position of the other bell mouth block 9, and the wall of the same thickness A hand hole having a thickness can be obtained.

In addition, the bell mouth block 9 is combined with the bell mouth and the tube body 15 in the hand hole 1, so the number of bell mouth blocks 9 stacked may be changed according to the required number of the tube bodies 15, etc. It is possible to easily cope with design changes on site.

Furthermore, according to the fixing member for fixing the thicknesses of the blocks 17a and 17b, the inter-block distance 20 of the blocks 17a and 17b can be easily fixed. In particular, since the thickness of the fixing member 21 is thicker than the depth of the groove 19 and less than twice the depth of the groove 19, the fixing member 21 is fixed in a state where the fixing member 21 is attached to the groove 19 of the blocks 17a and 17b. The member 21 protrudes from the blocks 17a and 17b, and the protruding fixing member 21 fits in the groove 19 of the blocks 17a and 17b of the adjacent bell mouth blocks, so that the adjacent bell mouth blocks 9 can be easily connected. At the same time, it is possible to prevent the positional displacement or collapse of the bell mouth block 9.

In addition, there is an inter-block distance 20b between the blocks 17a and 17b, and if concrete 31 is placed during hand hole formation, there is no need to separately provide a water-stopping material such as mortar between the bell mouth blocks. Construction time is shortened and construction is easy. Further, since a water stop material is provided between the tube body 15 and the blocks 17 a and 17 b, water does not penetrate into the hand hole 1.

Furthermore, if the blocks 17a, 17b and the like are molded from resin, a bellmouth block 9 which is light in weight, excellent in handleability and inexpensive can be obtained. In addition, a block gap 27 is provided between the block 17b and the inner surface of the hand hole 1, and concrete is placed in the block gap 27. Therefore, the inner surface of the hand hole is covered with non-combustible concrete, making it fire resistant. An excellent hand hole 1 can be obtained.

Moreover, since the blocks 17a and 17b are divided and concrete is placed between the block 17a and the block 17b when the hand hole 1 is constructed, the hand hole 1 having sufficient strength can be obtained.

Next, the bell mouth block 40 according to the second embodiment will be described. In the following embodiment, components having the same functions as those of the bell mouth block 9 shown in FIG. 2 are denoted by the same reference numerals as those in FIG.

FIG. 11A is a perspective view showing the bell mouth block 40. The blocks 17a and 17b of the bell mouth block 40 are provided with convex portions 41a and 41b and concave portions 43a and 43b in place of the grooves 19 provided in the blocks 17a and 17b of the bell mouth block 9. In addition, although illustration is abbreviate | omitted, the convex part 41 is provided in the back side surface of the blocks 17a and 17b, and the recessed part 43 is each provided in the bottom face of the blocks 17a and 17b. The convex portion 41 and the concave portion 43 have shapes that allow the convex portion 41 to be inserted into and fitted into the concave portion 43.

The bell mouth blocks 40 are connected by fitting the convex portions 41 and the concave portions 43 of the adjacent bell mouth blocks 40 together, thereby preventing displacement and collapse. In addition, in order to fix the inter-block distance 20 between the blocks 17a and 17b, the tube body 15 and the blocks 17a and 17b may be fixed by bonding or the like, and in addition to the convex portions 41 and the concave portions 43, they may be fixed. The member 21 may be provided. When the fixing member 21 is used together, it is necessary to provide the groove 19 corresponding to the fixing member 21. However, since the convex portion 41 and the concave portion 43 are responsible for preventing misalignment and the connecting function, the thickness of the fixing member 21 is the groove. It may be thinner than 19.

According to the bell mouth block 40 according to the second embodiment, the same effect as that of the bell mouth block 9 according to the first embodiment can be obtained. Further, if the inter-block distance 20 between the blocks 17a and 17b can be fixed, it is possible to prevent the bell mouth blocks 40 from being displaced or fall down without using the fixing member 21, and can be easily connected. Can be reduced.

Next, a bell mouth block 50 according to a third embodiment will be described. FIG. 11B is a perspective view showing the bell mouth block 50.

The blocks 17a and 17b of the bell mouth block 50 are provided with convex portions 51a and 51b and concave portions 53a and 53b in place of the grooves 19 provided in the blocks 17a and 17b of the bell mouth block 9. In addition, although illustration is abbreviate | omitted, the convex part 51 is provided in the back side surface of the blocks 17a and 17b, and the recessed part 53 is each provided in the bottom face of the blocks 17a and 17b.

The convex portion 51 is formed continuously in the thickness direction of the blocks 17a and 17b, and is formed so as to protrude in a rib shape so that the width is widened from the base to the blocks 17a and 17b. On the other hand, the concave portion 53 is formed continuously in the thickness direction of the blocks 17a and 17b, and is formed so that the groove width extends from the side surface of the blocks 17a and 17b. The convex portion 51 and the concave portion 53 have shapes corresponding to each other, and the convex portion 51 can be inserted into the concave portion 53.

When the bell mouth blocks 50 are stacked in a plurality of stages, the convex portions 51 of the bell mouth blocks 50 are fitted so as to slide in the axial direction of the tubular body 15 so as to fit into the concave portions 53 of the adjacent bell mouth blocks 50. The In addition, in order to fix the inter-block distance 20 between the blocks 17a and 17b, the tube body 15 and the blocks 17a and 17b may be fixed by bonding or the like. In addition to the convex portions 51 and the concave portions 53, A fixing member 21 may be provided. When the fixing member 21 is used together, it is necessary to provide the groove 19 corresponding to the fixing member 21. However, since the convex portion 51 and the concave portion 53 are responsible for preventing misalignment and the connecting function, the thickness of the fixing member 21 is the groove 19. It may be thinner.

According to the bell mouth block 50 according to the third embodiment, the same effect as the bell mouth block 9 according to the first embodiment can be obtained. Further, if the inter-block distance 20 between the blocks 17a and 17b can be fixed, it is possible to prevent the bell mouth blocks 40 from being displaced or fall down without using the fixing member 21, and can be easily connected. Can be reduced. Moreover, since the convex part 51 and the recessed part 53 are fitted so that it may slide and do not remove | deviate in a connection direction, the prevention effect, such as collapse and a fall, is high.

As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

For example, in the present embodiment, an example of the bell mouth block 9 having two tube bodies 15 has been shown, but the number of the tube bodies 15 and the like provided in the bell mouth block is not limited to this. For example, a bell mouth block having only one tube 15 may be used, or a bell mouth block having a plurality of rows and rows of tubes 15 may be used. A bell mouth block with a small number of tube bodies 15 can be finely adapted to the installation conditions of the hand hole shape, is light in weight, has excellent handleability, and has a plurality of stages and rows of tube bodies 15. If a mouse block is used, the number of parts can be reduced and the number of installation steps can be reduced.
There is no structural difference between a handhole and a manhole. A manhole having a size that allows a person to work inside is called a manhole, and the handhole and manhole are collectively called a piping box. The present invention is not limited to a handhole, but may be a manhole.

The figure which shows the structure of the handhole. It is a perspective view which shows the bellmouth block 9, (a) is a figure which shows the state which removed the fixing member, (b) is a figure which shows the state which attached the fixing member. It is a figure which shows the bellmouth block 9, (a) is a figure which shows the state which attached the long fixing member, (b) is a figure which shows the state which attached the short fixing member. The figure which shows the state which piled up the bellmouth block 9. FIG. It is a figure which shows the construction procedure of the handhole 1, (a) is a side view, (b) is a front view. The figure which shows the state in which the bellmouth block 9 was piled up. The figure which shows the state which installed the mold 25b. It is a figure which shows the state which installed the mold 25b, (a) is a front view, (b) is a top view. The figure which shows the state which laid concrete 31. FIG. The figure which shows the state which removed the formwork. (A) is a figure showing bell mouth block 40, (b) is a figure showing bell mouth block 50.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ......... Hand hole 1a, 1b ......... Side wall 3 ......... Side groove 5a, 5b ......... Side wall 7 ...... Bottom part 9 ...... Bell mouth block 11 ...... Joint 13 ...... Bel mouth opening part 15 ......... Tubes 17a, 17b ......... Block 19 ......... Grooves 20a, 20b ......... Inter-block distance 21 ......... Fixing member 22 ......... Bar portion 24 ......... Protrusions 25a, 25b ... ... Frame 27 ......... Block gap 29 ......... Lap part 31 ......... Concrete 41a, 41b ......... Convex parts 43a, 43b ......... Concave parts 51a, 51b ......... Convex parts 53a, 53b ......... Concave parts

Claims (8)

A step (a) of installing a first formwork;
A pair of first and second blocks;
A tube passing through the first and second blocks;
A bell mouth opening provided at an end of the tube on the second block side;
And mounting the bell mouth block in which the first and / or the second block is slidable in the axial direction of the tubular body so that the bell mouth opening is in contact with the first formwork. (B) and
A step (c) of installing a second mold so as to contact the first block from an end side of the first block of the tubular body;
Placing concrete between the first formwork and the second formwork (d);
Removing the first formwork and the second formwork (e);
The construction method of the handhole characterized by comprising. In the step (b),
The bell mouth block is installed in multiple stages and / or multiple rows,
The construction method of the handhole according to claim 1, wherein a stopper is provided at a contact portion between the bell mouth blocks. The shift stopper is a fixing member that fixes a distance between the first and second blocks, and the fixing member is fitted in a groove provided in the first and second blocks. The construction method of the handhole of 2. The slip stopper is a concave portion and a convex portion provided in the first and second blocks, and the concave portion and the convex portion of the adjacent bell mouth blocks are fitted to each other. The construction method of the handhole of claim | item 2. In the step (b),
The construction method of the handhole according to any one of claims 1 to 4, wherein a gap is provided between the first formwork and the second block. A plurality of bell mouth blocks having a pair of blocks, a tube passing through the pair of blocks, and a bell mouth opening provided at an end of the tube are provided in a plurality of stages and / or a plurality of rows, and the bell mouth A hand hole characterized in that the block is embedded in concrete. It is a bell mouth block used when arranging the cable,
A pair of blocks;
A tube passing through the block;
A bell mouth opening provided at an end of the tubular body;
Comprising
A bell mouth block, wherein the block is slidable in the axial direction of the tubular body. The block further comprises a detent to prevent displacement between the bell mouth blocks,
The bell mouth block according to claim 7, wherein the shift stopper is a fixing member that fixes a distance between the pair of blocks.

Images