JP2021093905A - Concrete product for cable housing and branching - Google Patents

Abstract

To provide a concrete product for cable housing and branching, capable of facilitating branching and connection work of cables housed therein in short time and with low labor.SOLUTION: A concrete product 10 for cable housing and branching includes: a concrete product body 12 including a bottom wall 18 and a side wall 20 formed, rising from the bottom wall 18 and having an internal space 22 for housing cables therein; a tapered piece member 14 which is formed integrally with the side wall 20 to embed both end faces to be exposed to internal and external faces of a side wall 20 of the concrete product body 12 and in which a cross section thereof increases little by little toward the outside from the inside of the side wall 20 and can form a through hole 30 at the side wall 20 when departed from the side wall 20; and a branching pipe device 14 including an engagement fitting part 44 engaged to be in close contact the through hole 30 formed to depart the piece member 14 from the side wall 20 and a branching path 37 formed integrally with the engagement fitting part 44.SELECTED DRAWING: Figure 1

Description

In the present invention, for example, concrete for storing and branching cables such as U-shaped grooves and hand holes used for internally accommodating cables and electric wires such as communication lines and power lines and branching or connecting them. Regarding the product.

In recent years, power lines for power transmission and distribution, communication lines for telephone and optical communication, etc. have been replaced with utility pole support on the ground in terms of workability, landscape, disaster prevention, etc. for construction and maintenance. , Underground burial is being promoted, and the number of areas where it is being implemented is increasing. Conventionally, in order to lay cables underground, for example, a U-shaped structure for accommodating cables inside and branching or connecting them has been proposed (see, for example, Patent Document 1). In the conventional U-shaped structure, the bottom plate and the four side walls are integrated with concrete, and when the cables are housed in the U-shaped structure, the cables are placed on the side walls of the U-shaped structure. As a method of forming a hole to pass through, a method of forming a knockout portion by setting a thin wall in advance at a position where cables on the side wall should be communicated and tapping the knockout portion of the thin wall at a construction site to form a hole. Are known. On the other hand, Patent Document 1 proposes a technique in which a notch is provided on the side wall of the main body of the U-shaped structure, a resin material is fitted and detachably provided in the notch, and a hole for passing a cable is formed in the resin material. There is.

Japanese Unexamined Patent Publication No. 9-191539

However, in the conventional method of forming a thin-walled knockout portion, the knockout portion cannot be formed to be extremely thin-walled in consideration of the permeation of water due to earth pressure or water pressure from the outside, and as a result, The work of forming a hole at the knockout part at the work site requires chipping work using a pick, chisel, electric cutter, electric drill, etc., which requires extremely large labor and even a skilled person can smoothly cut the edge of the hole. There was a problem that it could not be formed neatly and it took a long time to work. In addition, when installing a branch pipe for passing a branching cable or the like after forming a hole in the knockout part, a formwork or the like is installed to fill the gap between the branch pipe and the knocked out hole with concrete. Because the work was done in a large scale, the work was complicated and time-consuming and costly. Further, in the U-shaped structure described in Patent Document 1, it is necessary to form concrete and resin material in separate formwork and connect them in a liquid-tight state so that they can be fitted and detached, so that the manufacturing process is complicated. In addition to being costly, the strength and weather resistance of the resin material formed over a relatively large area may be inferior to that of concrete. Further, when processing a hole for passing a cable through the resin material, a step of attaching and detaching the resin material is also required, which causes a problem of inferior practicality.

The present invention has been made in view of the above-mentioned conventional problems, and one of the purposes thereof is to store and branch cables that can be easily, shortly, and with low labor for branching and connecting cables to be housed inside. To provide concrete products for use.

In order to solve the above problems, the present invention includes a bottom wall 18 and a side wall 20 formed by rising from the bottom wall 18, a concrete product main body 12 having an internal space 22 for accommodating cables, and both ends. A tapered shape that is integrally formed with the side wall 20 so that the surface is embedded in the inner and outer surfaces of the side wall 20 of the concrete product main body 12 in an exposed state, and the cross section gradually increases from the inside to the outside of the side wall. A coma member 14 which is a coma member 14, is provided so as to be removable by punching or pulling out from the inside to the outside, and can form a through hole in the side wall 20 when separated from the side wall 20, and the coma member 14. In the fitting mounting portion 44, which is closely fitted to the through hole 30 formed by separating from the side wall 20, and the fitting mounting portion so as to internally communicate with the internal space 22 of the concrete product main body 12 and insert cables. It is composed of a concrete product 10 for cable storage / branching, which includes a branch path 37 integrally formed and a branch pipe device 16 including the branch path 37.

Further, the fitting mounting portion 44 may be made of a coma-shaped block 42 formed in advance with resin concrete or concrete having substantially the same outer shape as the coma member 14.

Further, one end of the branch path 37 is fixed to the fitting mounting portion 44, and the other end of the branch path 37 protrudes toward the outside 36 of the side wall 20 while communicating internally with the internal space 22 of the concrete product main body 12. It may have a path forming pipe 40.

Further, the branch path 37 has a first branch path portion 37A provided in the fitting mounting portion 44 so as to communicate with the internal space 22 of the concrete product main body 12, and a pipe member whose one end is fixed to the fitting mounting portion 44. It may be provided with a second branch path forming pipe 41 that internally communicates with the first branch path 37A of the fitting mounting portion 44 to form the second branch path portion 37B.

Further, the concrete product body 12 is provided with a fall prevention net 46 that is detachably attached to the inside of the side wall so as to prevent the lid 32 that opens and closes above the concrete product body 12 from falling into the internal space 22. It may be that.

Further, the hook member 48 that locks the fall prevention net 46 on the upper side of the side wall 20 may be provided.

Further, the internal space 22 of the concrete product main body 12 may be provided with a partition member 26 erected on the bottom wall 18 so as to divide the space for accommodating cables into a plurality of spaces.

Further, the top member 14 has a first tapered portion 64 having a tapered side surface that expands from the inside of the concrete product main body 12 toward the outer surface of the side wall 20, and the cross section gradually increases toward the outer surface side of the side wall 20, and the concrete product. A second tapered portion 66, a first tapered portion 64, and a second tapered portion 66 having a tapered side surface that expands from an intermediate position of the thickness of the side wall 20 of the main body 12 toward the outer surface of the side wall 20 and gradually increasing in cross section toward the outer surface of the side wall 20. 2 From the side wall 20 on the tapered side surface of the second taper portion 66, including a step portion 68 interposed at a joint portion with the second taper portion 66 to form a step between the first taper portion 64 and the second taper portion 66. The inclination angle α2 with respect to the withdrawal direction of the top member 14 is set at an angle larger than the inclination angle α1 with respect to the withdrawal direction of the top member 14 from the side wall 20 on the tapered side surface of the first tapered portion 64. Good.

Further, the fitting mounting portion 44 has an insertion recess 76 in which a part of the side surface of the side wall 20 of the concrete product body facing the through hole 30 is recessed, and the through hole 30 is formed from the outer side of the side wall 20. It is also possible to have a wedge member 78 that is inserted in close contact between the inner wall of the fitting and mounting portion 44 and the insertion recess 76 of the fitting and mounting portion 44 to hold the fitting and mounting state of the fitting and mounting portion 44.

The wedge member 78 may include a concave-convex portion 80 in which a plurality of irregularities are repeatedly formed in a part or all of a portion of the insertion recess 76 of the fitting mounting portion 44 or a portion of the side wall 20 that abuts on the inner surface of the through hole 30. Good.

Further, in the insertion recess 74 of the fitting mounting portion 44 and / or the inner wall of the through hole 30 of the side wall 20, the concave-convex receiving portion that meshes with the concave-convex portion 80 when the wedge member 78 is inserted. It may be assumed that 76 has been formed.

Further, the side wall 20 and the fitting mounting portion 40 in the vicinity of the fitting contact portion between the through hole 30 of the side wall 20 of the concrete product 12 and the fitting mounting portion 44 fitted and mounted in the through hole 30 of the side wall 20. The fixing auxiliary member 90 may be provided so as to straddle the portion 44 and engage so as to bite into the fitting mounting portion 22 to prevent the fitting mounting portion 22 from coming off from the through hole 30.

Further, the fixing auxiliary member 90 may be made of a concrete screw 92 that spirally bites and engages with the side wall 20 and the fitting mounting portion 44.

According to the concrete product for cable storage / branching of the present invention, a concrete product main body including a bottom wall and a side wall formed by rising from the bottom wall and having an internal space for accommodating cables and both end surfaces thereof. It is a tapered coma member that is integrally formed with the side wall so as to be embedded in the inner and outer surfaces of the side wall of the concrete product body in an exposed state, and the cross section gradually increases from the inside to the outside of the side wall. A piece member that is provided so as to be removable by punching or pulling out from the inside to the outside and can form a through hole in the side wall when separated from the side wall, and a through hole formed by separating the piece member from the side wall. A branch pipe device including a fitting mounting portion that is closely fitted to the concrete product body and a branch path that is integrally formed in the fitting mounting portion so as to communicate internally with the internal space of the concrete product body and insert cables. Therefore, the concrete product main body is installed at the site, and the top member of the side wall is hit with a hammer or the like to separate it according to the place where the cables are branched to form a through hole, and the through hole is formed. By simply mounting the branch pipe device in a mating shape, the cables can be easily branched in a short time and at low cost without damaging the cables.

Further, the fitting mounting portion is composed of a coma-shaped block formed in advance with resin concrete or concrete having substantially the same outer shape as the coma member, so that the coma-shaped block can be easily manufactured by a formwork or the like. In addition to being able to do this, it can be manufactured at low cost by mass-producing it in advance. Simply by fitting the fitting mounting part into the through hole and fixing it with an adhesive, etc., the cables can be easily and quickly manufactured. Can perform branching work.

Further, the branch path has a branch path forming pipe in which one end is fixed to the fitting mounting portion and the other end protrudes toward the outside of the side wall while communicating internally with the internal space of the concrete product main body. Therefore, the branch pipe device can be manufactured with a simple configuration, and the cable pull-out direction can be easily set by the branch path forming pipe.

Further, the branch path is composed of a first branch path portion provided in the fitting mounting portion so as to communicate with the internal space of the concrete product main body, and a pipe member whose one end is fixed to the fitting mounting portion. By forming a configuration provided with a second branch path forming pipe that internally communicates with the first branch path of the mounting portion to form a second branch path portion, the branch path forming pipe can be made simple, for example, a straight pipe. The rounded portion of the branch path on the internal space side can be easily formed by a concrete or resin concrete formwork, and the branch pipe device can be manufactured with a simple structure.

In addition, the concrete product body shall be provided with a fall prevention net that is detachably attached to the inside of the side wall so as to prevent the lid that opens and closes above the concrete product body from falling into the internal space. As a result, it is possible to reliably prevent an accident in which the lid that closes the concrete product body suddenly falls into the internal space accommodating the cable and damages or breaks the cable.

Further, by having a hook member for locking the fall prevention net on the upper side of the side wall, the fall prevention net can be easily and quickly attached to and detached from the side wall.

Further, the internal space of the concrete product body is provided with a partition member erected on the bottom wall so as to divide the space for accommodating cables into a plurality of spaces, so that the space is relatively thick, for example. The space for accommodating can be divided according to the types of cables such as high-strength power lines and relatively thin and low-strength communication lines. As a result, workability and maintainability related to laying, branching, and connection of cables can be improved, and it is easy to protect and manage each cable.

Further, the top member has a first tapered portion having a tapered side surface that expands from the inside of the concrete product body toward the outer surface of the side wall, and the cross section gradually increases toward the outer surface side of the side wall, and the thickness of the side wall of the concrete product body. It is provided between a second tapered portion having a tapered side surface that expands from an intermediate position toward the outer surface of the side wall and the cross section gradually increasing toward the outer surface of the side wall, and a joint portion between the first tapered portion and the second tapered portion. The inclination angle of the tapered side surface of the second tapered portion with respect to the removal direction of the coma member from the side wall includes the step portion that forms a step between the first tapered portion and the second tapered portion. By making the configuration provided at an angle larger than the inclination angle of the top member from the side wall of the tapered side surface with respect to the pulling-out direction of the top member, when the top member is punched or pulled out as necessary to form a through hole. For example, it is possible to smoothly perform the entire work including the subsequent installation of the branch pipe device, etc., because the edge chipping that a part of the side wall of the concrete top member or the concrete product body is chipped is less likely to occur and the concrete scraps are less likely to be generated. it can.

Further, the fitting mounting portion has an insertion recess in which a part of the side surface facing the through hole of the side wall of the concrete product is recessed, and the fitting mounting portion is fitted with the inner wall of the through hole from the outer side of the side wall. The fitting mounting portion is fitted and mounted in the through hole by having a structure having a wedge member that is inserted in close contact with the insertion recess of the portion and holds the fitting mounting state of the fitting mounting portion. In this state, it is possible to reliably prevent the fitting mounting portion from shifting or coming off. Therefore, it is possible to smoothly proceed with the cable branching work and the soil backfilling work after the work, and it is possible to shorten the construction period.

The wedge member has a large number of irregularities by including a concave-convex portion in which a plurality of irregularities are repeatedly formed in a part or all of a portion abutting on the inner surface of the insertion recess of the fitting mounting portion or the through hole of the side wall. The function of holding the fitting and mounting state in the through hole of the fitting and mounting portion by the wedge member can be improved by the frictional force of the portion and the like.

Further, the insertion recess of the fitting mounting portion and / or the inner wall of the through hole of the side wall is formed with a concave-convex receiving portion that meshes with the concave-convex portion when the wedge member is inserted. By doing so, the bonding state between the wedge member and the fitting mounting portion or the side wall of the concrete product can be made stronger, and the function of holding the fitting mounting state in the through hole of the fitting mounting portion by the wedge member can be improved.

Further, the through hole of the side wall of the concrete product and the fitting mounting portion fitted and mounted in the through hole of the side wall so as to bite across the side wall and the fitting mounting portion in the vicinity of the fitting contact portion. By having a structure having a fixing auxiliary member that engages and prevents the fitting mounting portion from coming off from the through hole, the fitting mounting portion is fitted and mounted in the through hole, and the fitting mounting portion is fitted and mounted. It can be surely prevented from slipping or coming off. Therefore, it is possible to smoothly proceed with the cable branching work and the soil backfilling work after the work, and it is possible to shorten the construction period.

Further, the fixing auxiliary member can be realized at low cost and concrete by forming a structure composed of concrete screws that spirally bite and engage with the side wall and the fitting mounting portion. It can be easily fixed by simply screwing in the screw to prevent the fitting mounting portion from slipping or coming off.

It is a perspective explanatory view of the concrete product for cable storage and branching which concerns on 1st Embodiment of this invention. It is a vertical sectional view of the concrete product for cable storage and branching of FIG. It is a side view of the concrete product for cable storage and branching of FIG. It is a top view of the concrete product for cable storage and branching of FIG. It is operation explanatory drawing of the concrete product for cable storage and branching of FIG. (A) is a perspective explanatory view of another embodiment of the branch pipe device of the concrete product for cable storage / branching of FIG. 1, and (b) is a cross-sectional view of the branch pipe device. (A) is a perspective explanatory view of another embodiment of the branch pipe device of the concrete product for cable storage / branching of FIG. 1, and (b) is a cross-sectional view of the branch pipe device. (A) is a perspective explanatory view of another embodiment of the branch pipe device of the concrete product for cable storage / branching of FIG. 1, and (b) is a cross-sectional view of the branch pipe device. It is explanatory drawing of another Example of the concrete product for cable storage and branching of FIG. (A) is a perspective explanatory view of another embodiment of the branch pipe device of the concrete product for cable storage / branching in FIG. 8, and (b) is a cross-sectional view of the branch pipe device. It is explanatory drawing of the concrete product for cable storage and branching which concerns on 2nd Embodiment of this invention. It is sectional drawing explanatory view of the concrete product for cable storage and branching of FIG. (A) is a perspective explanatory view of another embodiment of a branch pipe device of a concrete product for cable storage / branching in FIG. 10, and (b) is a cross-sectional view of the branch pipe device. (A) is a perspective explanatory view of another embodiment of a branch pipe device of a concrete product for cable storage / branching in FIG. 10, and (b) is a cross-sectional view of the branch pipe device. It is explanatory drawing of the concrete product for cable storage and branching which concerns on 3rd Embodiment of this invention. (A) A partially enlarged view of a vertical cross-sectional view of a top member portion of a side wall of a concrete product for cable storage / branching in FIG. 15, and (b) a state in which a through hole is formed by pulling out the top member. FIG. 15 is an explanatory cross-sectional view of the concrete product for cable storage / branching shown in FIG. 15 in a state where the branch pipe device is attached. It is a partially enlarged explanatory view of the CC cross section of FIG. FIG. 5 is an enlarged explanatory view of a main part of a modified example of the concrete product for cable storage / branching in FIG. It is explanatory drawing of an example at the time of forming the concavo-convex receiving portion of the inner surface wall of the through hole of the side wall of FIG. It is explanatory drawing of the concrete product for cable storage and branching which concerns on 4th Embodiment of this invention. FIG. 21 is a partially enlarged explanatory view of a vertical cross section of a portion of the concrete product for cable storage / branching in FIG. 21 in which concrete screws are engaged. (A) A partially enlarged view of a vertical cross-sectional view of a coma member portion of a side wall of a concrete product for cable storage / branching in FIG. 21, (b) a vertical cross-sectional view around a side wall in which a coma member is embedded, and (c) a coma member. It is explanatory drawing of the state which formed the through hole by pulling out, and (d) is the explanatory view of the state which the fitting mounting part was attached to the through hole.

Hereinafter, embodiments of the concrete product for cable storage / branching of the present invention will be described with reference to the accompanying drawings. The concrete product for storing and branching cables according to the present invention is, for example, a U used for accommodating cables such as power lines and communication lines, electric wires, etc. inside and laying them underground (underground) or above ground. It is a branch box for character grooves and hand holes. 1 to 5 show a first embodiment of the concrete product for cable storage / branching of the present invention. As shown in FIGS. 1 and 2, the concrete product 10 for cable storage / branching according to the present embodiment includes a concrete product main body 12, a coma member 14 embedded in a side wall of the concrete product main body 12, and a branch pipe device 16. And.

The concrete product main body 12 includes a bottom wall 18 and a side wall 20 formed by rising from the bottom wall 18, and has an internal space 22 for storing cables having an upper surface opened inside. In the present embodiment, as shown in FIGS. 1, 2 and 3, the concrete product main body 12 is formed of, for example, a U-shaped groove. Specifically, the concrete product main body 12 includes a bottom wall 18 and left and right side walls 20 formed by rising from both left and right sides of the bottom wall 18, and the left and right side walls 20 on the bottom wall 18 face each other. It is composed of a U-shaped groove main body 13 having an internal space 22 having an open upper surface on the internal side, and the internal space 22 is a space for accommodating cables. The concrete product body 12 formed of the U-shaped groove 13 is made of concrete, for example, a substantially rectangular bottom wall made of concrete and long in the front-rear direction by a formwork, and left and right side walls erected from both the left and right sides of the bottom wall are integrally integrated. A plurality of U-shaped groove blocks 24 formed are connected in the longitudinal direction and continuously formed in a straight line, and a long continuous internal space 22 is formed on one side. The U-shaped groove main body 13 may be formed of one concrete U-shaped block. Further, the concrete product main body 12 may be a general-purpose concrete product obtained by molding and solidifying cement, water, and sand, or using a thermosetting resin (resin) as a binder without using cement or water, and crushing stone, sand, or carbon dioxide. It may be a resin concrete product in which calcium is firmly hardened. Furthermore, concrete that is manufactured with extremely reduced fine aggregate compared to ordinary concrete, or porous concrete that is manufactured only with cement, water, and coarse aggregate without using fine aggregate. It may be a concrete product. A plurality of mounting holes 28 for mounting the partition member 26 described later are formed on the upper surface side of the bottom wall 18 of the U-shaped groove main body 13 at predetermined intervals along the longitudinal direction. In the present embodiment, the U-shaped groove main body 13 is closed by attaching a lid 32 to the upper end of the side wall 20 so as to be openable and closable above the internal space 22. The lid 32 is made of concrete, for example, and is provided in a substantially rectangular plate shape having a size that is substantially the same as the left and right width of the U-shaped groove main body 13. The lid 32 is attached by a so-called cover method so that it is placed on the upper end of the side wall 20, for example, and is installed so that the upper surface of the lid 32 is flush with the ground GL. The lid 32 is provided with a hole for connecting a hanging support for suspending, and when opening and closing the lid 32, a hanging support (not shown) is attached and suspended by a crane or the like. Be done. Further, the lid 32 is provided with an insertion hole for inserting a connecting bolt for connecting and fixing to the concrete product main body 12. An insert nut (not shown) that is screwed with a connecting bolt for connecting to the lid is embedded in the concrete product body 12 side. The U-shaped groove main body 13 may be formed by one concrete U-shaped block, or when it is necessary to form a long accommodating space 22 long, a plurality of concrete U-shaped blocks are connected. It may be configured as follows.

In the present embodiment, the partition member 26 divides the internal space 22 for accommodating cables into two in the left-right width direction in the internal space 22 of the concrete product main body 12 made of the U-shaped groove main body 13. The partition member 26 is made of, for example, a hard synthetic resin such as plastic or a hard material such as concrete or metal, and is made of a substantially rectangular plate member, and the inside thereof is made so that the plate surface faces the side wall of the U-shaped groove main body 13. It is erected on the bottom wall 18 at an intermediate position in the left-right width direction of the space 22. As shown in FIG. 4, a plurality of partition members 26 are arranged side by side in a straight line with a space of 25 from each other along the longitudinal direction of the U-shaped groove main body 13. As shown in FIG. 2, the partition member 26 has its lower end engaged with the mounting hole 28 of the U-shaped groove main body 13 in a fitting manner, and is detachably mounted on the bottom wall 18 to stand upright. It is installed. In the present embodiment, the partition member 26 is erected, for example, at a position slightly to the left of the left and right center positions of the internal space 22. For example, the relatively thin and weak communication line L1 is accommodated in the accommodation compartment 23A on the left side of the internal space 22 divided into two by the partition member 26, and the accommodation compartment 23B on the right side of the internal space is relatively thin. Cables of different types can be laid and accommodated in the same internal space 22 by accommodating a thick and strong power line. The partition member 26 is set lower than the height of the side wall 20, that is, the height of the internal space 22, and the two accommodation spaces 23A and 23B communicate with each other above the partition member 26. The cables (communication line L1, power line L2) separately accommodated in the two accommodating compartments 23A and 23B pass through the gap 25 between the partition members 26 arranged side by side in the longitudinal direction and the upper side of the partition member 26. , Cables can be guided to the through hole facing the other accommodation space side. A plurality of partition members 26 may be provided so as to divide the internal space 22 of the concrete product main body 12 into three or more in the left-right width direction. Further, the partition member 26 is not limited to a plate shape, and may be any structure as long as it partitions the internal space 22 so that cables can be separately accommodated, such as a net shape, a fence shape, a grid shape, and a rod shape.

The top member 14 is embedded in the side wall 20 of the concrete product main body 12 (U-shaped groove main body 13), is integrally formed with the side wall 20, forms a part of the side wall 18, and is formed from the side wall 20 as needed. It can be detached to form a through hole 30 in the side wall 20 through which cables are passed. In the present embodiment, as shown in FIGS. 1, 2, 3, and 4, the frame member 14 is formed in advance in a predetermined three-dimensional shape with, for example, concrete or the like, and both end faces (34, 35) are U-shaped. The side wall 20 and the side wall 20 are integrally formed of concrete so as to be buried in a state of being exposed to the inner and outer surfaces at an intermediate position between the upper and lower sides of the side wall 20 of the groove main body 13. More specifically, the top member 14 has, for example, a tapered shape that gradually increases from the inside (22) to the outside (36) of the side wall 20 of the U-shaped groove main body 13 and intersects in the thickness direction of the side wall. It is provided in a substantially truncated cone shape in which the cross section on the surface is substantially oval and the vertical cross section on the surface along the thickness direction is substantially trapezoidal. The top member 14 is provided long along the longitudinal direction of the side wall 20, and as a result, the shape of the through hole 30 formed when the top member 14 is detached is also long along the longitudinal direction of the side wall 20. It has an oval shape. The top member 14 is flush with the inner and outer surfaces of the side wall 20 of the U-shaped groove main body 13, with two flat bottom surfaces as both end faces, with the central axis of a substantially truncated cone shape lying sideways toward the inside and outside of the side wall. It is arranged so as to be. That is, the thickness of the top member 14 (height in the central axis direction of the frustum shape) is set to be substantially the same as the thickness of the side wall 20 of the U-shaped groove main body 13. In the top member 14, the surface on the side having a substantially truncated cone shape with a small area is set as the inner end surface 34 on the inside (internal space 22 side) of the side wall 20 of the U-shaped groove main body 13, and the end surface on the side with a large area is said. It is arranged as an outer end face 35 which is the outer side (outer 36) of the side wall 20. As a result, when the concrete product 10 is installed in the ground or the like, even if earth pressure, water pressure, or the like is applied from the outside to the inside of the side wall 20, the coma member 14 can be maintained in a closed state without being detached inward. Further, as shown in FIG. 5, when the frame member 14 is separated from the side wall 20 of the U-shaped groove main body 13 to form a through hole 30 for passing cables in the side wall 20, the frame member 14 is directed from the inside to the outside of the box. The through hole 30 can be formed by simply striking it with a hammer or the like and allowing it to be detached easily and in a short time. A plurality of coma members 14 are embedded in each of the left and right side walls 20, for example, and are arranged at predetermined intervals along the longitudinal direction. When the cables are pulled in from the outside or pulled out from the inside to the outside, the coma member 14 embedded at a desired position on the side wall is separated from the side wall to form a through hole 30, and the branch pipe device 16 is used. Will be installed. The top member 14 is not limited to the above shape, and may have any other arbitrary shape such as a truncated cone shape, a truncated pyramid shape with rounded corners, or an elliptical frustum shape. Since the shape of the through hole 30 after being detached is determined by the shape of the top member 14, it is preferable to select and form a circular shape or a long shape on one side according to the thickness and strength of the cables.

In the present embodiment, when molding the concrete product main body 12 in which the coma member 14 is embedded in the side wall 20, for example, the coma member 14 is formwork-formed in advance to form the U-shaped groove main body 13 or the like. When the U-shaped groove block 24 is formed, it is embedded and molded at the same time. For example, the inner formwork is assembled so that the bottom wall side of the U-shaped groove block 24 faces upward, and the outer formwork is assembled around the inner formwork at a predetermined interval. At that time, for example, in a state where the coma member is supported at a predetermined height position of the outer formwork via a pin member supported by the outer formwork, ready-mixed concrete is cast into the formwork to be cured and solidified. By doing so, it is possible to form the U-shaped groove block 13 in which the coma member 14 is embedded in the side wall 20.

The branch pipe device 16 is mounted in a through hole 30 formed by separating the coma member 14 embedded in the side wall 20 of the concrete product main body 12 from the side wall 20, and internally communicates with the internal space 22 accommodating cables. It is a branch path means for forming a branch path 37 and inserting cables into the branch path 37. In the present embodiment, as shown in FIGS. 1, 4, and 5, for example, a mounting portion 38 formed of a synthetic resin of polyvinyl chloride resin or fiber reinforced plastic and mounted in the through hole 30 of the side wall 20. One end is fixed to the mounting portion 38, and the U-shaped groove main body 13 is internally communicated with the internal space 22 toward the outside (36) of the side wall 20 in an intersecting direction with respect to the longitudinal direction of the internal space 22. It has a branch path forming pipe 40 provided in the above. The mounting portion 38 is a base body in which the base side of the branch path forming pipe 40 is integrally fixed, and has a fitting mounting portion 44 that is inserted into the through hole 30 of the side wall 20 in a mating manner. The branch pipe device 16 is composed of a coma-shaped block 42 formed by integrating the branch path forming pipe 40 and the fitting mounting portion 44 as the mounting portion 38. The fitting mounting portion 44 is formed by forming a form with resin concrete, concrete, or the like, for example, in the shape of a tapered through hole 30, that is, a long truncated cone shape having substantially the same outer shape as the outer shape of the tapered top member 14. Has been done. The fitting mounting portion 44 is set so that when the fitting mounting portion 44 is fitted into the through hole 30 of the side wall 20, the internal space 16 side is flush with the inner surface side of the side wall 20. The top-shaped block 42 is fixed by adhering the fitting mounting portion 44 and the through hole 30 with an adhesive such as epoxy resin to stop water. As a result, the workability of attaching the branch pipe device 16 to the concrete product main body 12 in a short time is improved, and the work can be easily performed in a short time with low labor even at the site of laying cables. The branch path forming pipe 40 is provided in the intersecting direction so as to form a branch path 37 in a branched shape with respect to the long internal space 22 on one side. In a plan view, the interior space 22 is installed so as to be at an angle of 45 degrees with respect to the longitudinal direction. The direction of the branch path forming pipe of the branch pipe device 16 may be arbitrarily set according to the branch direction and the type of cables. The branch path forming pipe 40 has, for example, a long cylindrical portion protruding outward from the side wall 20, and one end thereof is integrally fixed with the fitting mounting portion 44. In the branch path 37 formed by the branch path forming pipe 40, as shown in FIG. 5 (c), the opening edge portion communicating with the internal space 22 of the U-shaped groove main body 13 on the fitting mounting portion 44 side. A rounded portion 37R is formed in the periphery so as not to damage the cables passing through the branch path 37. In the present embodiment, the branch path forming pipe 40 and the rounded portion 37R are integrally formed of a hard material such as metal or resin to form a branch path 37, and the base side is embedded in the fitting mounting portion 44 and integrally fixed. Has been done. For example, a cable protection pipe 52 such as a flexible pipe is connected to the tip of the branch path forming pipe 40, and cables branched from cables housed in the internal space 22 of the U-shaped groove main body 13 are connected. Be housed.

As shown in FIGS. 1, 2, and 4, on the upper side of the side wall 20 of the U-shaped groove main body 13, that is, the opening side of the upper part of the internal space 22, the lid 32 of the U-shaped groove main body 13 goes to the internal space 22. A fall prevention net 46 for preventing the fall is provided. The fall prevention net 46 is made of, for example, a flexible net formed by inserting a thin metal wire into a core material and covering the periphery with a resin material so that a certain degree of flexibility and strength can be maintained at the same time. , It is stretched to the upper side of the internal space 22, and is detachably attached to the opposite inner side of the side wall 20 via a hook member 48 fixed to the upper side of the side wall 20. The fall prevention net 46 may be composed of one long net member along the longitudinal direction of the U-shaped groove main body 13, a plurality of net members may be connected in series, or at a predetermined interval. It may be provided with an opening. The hook member 48 is made of, for example, a metal rod bent in a substantially J shape, and can be rotated around the vertical axis by an inverted L-shaped bracket member 50 fixed to the upper part of the side wall 20 with a concrete screw or the like. It is attached. A plurality of hook members 48 are arranged at predetermined intervals along the longitudinal direction of the side wall 20, and the left and right sides of the fall prevention net 46 are locked and supported at predetermined intervals. The hook member 48 is rotatably attached around the vertical axis to lock the net when, for example, accommodating cables, connecting, branching work, performing maintenance work, or the like. It is also possible to run along the inner surface side of the side wall 20 so that the tip of the hook that is not in the way does not get in the way. The configuration of the hook member 48 is not limited to the above configuration, and for example, a member that can lock a claw-shaped or U-shaped net is fixed to the side wall via a bolt or other fixing means, or the like. It may have any structure.

Next, the operation of the cable storage / branching concrete product 10 according to the present embodiment will be described. For example, in a factory or the like, a plurality of U-shaped groove blocks 24 constituting the concrete product main body 12 composed of the U-shaped groove main body 13 as described above are formed in a formwork, and a branch pipe device 16 and a plurality of partitions are formed. The member 26 is molded. The U-shaped groove block 24 and the branch pipe device 16 are placed on a truck or the like and transported to, for example, a site where underground wiring is performed, and the U-shaped groove block 24 is placed at a predetermined position where the ground is excavated while being longitudinally arranged. A long U-shaped groove main body 13 is installed on one side in series while being connected in the direction. A partition member 26 is installed on the side wall 18 of the U-shaped groove main body 13, and the internal space 22 is divided into, for example, a storage compartment 23A for the communication line L1 and a storage compartment 23B for the power line L2. Cables such as communication line L1 and power line L2 are housed inside the U-shaped groove main body 13 by type. When the cables are branched as needed, as shown in FIG. 5B, the frame member 14 of the side wall 20 of the U-shaped groove main body 13 is divided into the internal space of the side wall 14 by a hammer or the like according to the branching location. The top member 14 is separated from the side wall 20 by hitting it strongly from the side to the outside to form a through hole 30. The top member 14 at a position where the through hole 30 is not formed maintains the closed state of the side wall 20. The branch pipe device 16 is mounted in the through hole 30, and the through hole 30 and the fitting mounting portion 44 of the branch pipe device 16 are fixed with mortar, epoxy resin, or the like. In FIG. 5, the branch pipe device 16 is provided at only one place, but it may be attached to a plurality of places depending on the branch points of the cables. As shown in FIG. 5C, for example, cables that are relatively thick and strong and difficult to bend, such as the power line L2, are often difficult to bend near 90 degrees, and are branched in an oblique direction. It is bent diagonally through the branch path 37 of the pipe device 16 and pulled out to the outside. The cables L2 drawn from the U-shaped groove main body 13 via the branch path of the branch pipe device 16 are routed in the cable protection pipe 52 connected to the branch pipe device 16. When the accommodation and branching work of the cables are completed, the fall prevention net 46 of the lid is spread via the hook member 48 fixed to the upper end side of the side wall 20 of the U-shaped groove main body 13 to the upper side of the internal space 22. Install. The U-shaped groove main body 13 is closed by the lid 32, the external space 36 of the side wall 20 is backfilled, and the cables are laid underground.

The concrete product main body 12, the top member 14, the branch pipe device 16, and the like are not limited to the above embodiments. For example, the branch pipe device 16 may be arbitrary as long as it is mounted in the through hole portion to form the branch path 37. For example, FIGS. 6, 7, 8, 9, and 10 show other forms such as the branch pipe device 16. In the embodiment of FIG. 6, a part of the branch path is provided in the fitting mounting portion 44 portion of the coma-shaped block 42 so as to communicate with the rounded portion 37R and the rounded portion 37 on the internal space 22 side of the concrete product main body 12. ing. The branch path forming pipe 41 is formed of, for example, a straight pipe forming a second branch path 37B inside, and the base side thereof is inserted and fixed to an intermediate depth position of a fitting mounting portion 44 made of resin concrete or the like. The branch path 37B inside the straight pipe and the first branch path 37A of the fitting mounting portion 44 are internally communicated to form a branch path. On the outside of the coma-shaped block 42, a partially raised portion 42a is formed so as to cover the base side of the branch path forming pipe 40 and firmly fix it. In the embodiment of FIG. 7, the direction of the branch path 37 of the coma-shaped block 42, that is, the direction of the branch path forming pipe 40 is orthogonal to the longitudinal direction of the U-shaped groove main body 13, that is, with respect to the side wall 20. It is set in the vertical direction. Also in this embodiment, the branch path forming pipe 40 and the rounded portion 37R are integrally formed. In the embodiment of FIG. 8, in the branch pipe device 16, two branch road forming pipes 43 are juxtaposed and fixed to one fitting mounting portion 44, and two branch roads are formed. Also in this embodiment, the direction of the branch path 37 by the two branch path forming pipes 43 is set in the direction orthogonal to the longitudinal direction of the U-shaped groove main body 13, that is, in the direction perpendicular to the side wall 20. Further, the branch path forming pipe 43 has a socket portion integrally formed by expanding the diameter on the outer side, and an end portion of a cable protection pipe 52 such as a bellows pipe is inserted into the socket portion to be connected.

In the examples of FIGS. 9 and 10, the shape of the coma member 14, that is, the shape of the through hole 30, is formed different from the above. The coma member 14 is provided in a substantially truncated cone shape having a cross-sectional truncated cone shape that gradually increases from the inside to the outside in substantially the same manner as described above, but is enlarged in a flange shape on the peripheral edge portion on the outer end side. A convex portion 54 is provided. Therefore, an enlarged recess 56 corresponding to the convex portion 54 is formed in the through hole 20 formed after the coma member 14 is separated from the side wall 20. The branch pipe device 16 has substantially the same configuration as those in FIGS. 4 and 5 described above, but the recess 58 continuous with the peripheral edge of the inner end portion of the fitting mounting portion 44 on the internal space side of the U-shaped groove main body 13. Is provided. As shown in FIG. 10B, when the fitting mounting portion 44 of the branch pipe device 16 is inserted into the through hole 30, the portion of the recess 58 of the fitting mounting portion 44 and the enlarged recess 56 of the through hole 30 An annular gap remains in each. The branch pipe device 16 can be fixed to the side wall 20 by filling the gap with a fixing filler 60 such as an epoxy resin, and water can be stopped satisfactorily.

Next, a second embodiment of the concrete product for cable storage / branching of the present invention will be described with reference to FIGS. 11 and 12. The same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. As shown in FIGS. 11 and 12, in the present embodiment as well, the concrete product 10-2 for cable storage / branching includes the concrete product main body 12, the coma member 14, and the branch pipe device 16 as in the above embodiment. Be prepared. In the present embodiment, the concrete product main body 12 is composed of a branch box 62 such as a hand hole or a manhole, for example. The branch box 62 includes, for example, a rectangular bottom wall 18 and four side walls 20 rising from the four sides of the bottom wall 18, and has an internal space 22 surrounded by the side walls and opened upward. .. The top member 14, for example, has a tapered shape that gradually increases from the inside to the outside of the side wall 20 of the concrete product main body 12, and is provided, for example, in a substantially truncated cone shape. Therefore, the through hole 30 formed when the top member 14 is separated from the side wall 20 is also formed by a substantially truncated cone-shaped hole. The branch pipe device 16 has a mounting portion 38 including a branch road forming pipe 40 and a fitting mounting portion 44A in which the base of the branch road forming pipe 40 is fixed. The fitting mounting portion 44A is formed in a substantially truncated cone shape corresponding to the shape of the through hole 30. The branch path forming pipe 40 forms a branch path 37 in the direction perpendicular to the outer surface of the side wall 20. The branch path forming pipe 40 and the rounded portion 37R are integrally provided with, for example, a hard material such as metal or resin. For example, the branch path forming pipe 40 uses a known member such as a bell mouth to integrally form a fitting mounting portion 44A with resin concrete or concrete around it to form a branch path block. May be. Even if the concrete product main body 12 is a branch box 62 as in the present embodiment, the concrete product main body is installed at the site, and the top side wall member is hit with a hammer or the like according to the place where the cables are branched to separate the concrete product main body 12. By simply forming a through hole and attaching a branch pipe device to the through hole, the branching work of cables can be performed easily, in a short time, and at low cost. Further, in the embodiment of the branch box 42, the upper opening may be closed by a lid. At that time, a fall prevention net, a hook member, or the like may be provided inside the side wall 20.

Note that FIG. 13 is another embodiment of the branch pipe device 16. In the embodiment of FIG. 13, similarly to the embodiment of FIG. 6, the fitting mounting portion 44 portion of the coma-shaped block 42 is communicated with the rounded portion 37R and the rounded portion 37R on the internal space 22 side of the concrete product main body 12. A first branch road 37A that is a part of the branch road is provided. The branch path forming pipe 41 is formed of, for example, a straight pipe forming a second branch path 37B inside, and the base side thereof is inserted and fixed to an intermediate depth position of a fitting mounting portion 44A made of resin concrete or the like. A branch path is formed by internally communicating with the second branch path 37B inside the straight pipe and the first branch path 37A of the fitting mounting portion 44.

Further, in the embodiment of FIG. 14, the coma member 14 is provided in a substantially truncated cone shape gradually increasing from the inside to the outside as in the examples of FIGS. 11 and 12, but is the same as in the examples of FIGS. 9 and 10. Is provided with a flange-shaped enlarged convex portion 54 on the peripheral edge portion on the outer end side. Therefore, an enlarged recess 56 corresponding to the convex portion 54 is formed in the through hole 20 formed after the coma member 14 is separated from the side wall 20. The branch pipe device 16 is provided with a continuous recess 58 at the peripheral edge of the end of the U-shaped groove main body 13 of the fitting mounting portion 44 on the internal space side. The fitting mounting portion 44 of the branch pipe device 16 is inserted into the through hole 30 of the side wall 20, and epoxy resin or the like is fixed to the gap between the recess 58 of the fitting mounting portion 44 and the enlarged recess 56 of the through hole 30. The filler 60 is filled and the branch pipe device 16 is fixed to the side wall 20.

Next, a third embodiment of the concrete product for cable storage / branching of the present invention will be described with reference to FIGS. 15, 16, 17, and 18. The same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. As shown in FIGS. 15 and 16, in the present embodiment as well, the concrete product 10-3 for cable storage / branching includes the concrete product main body 12, the coma member 14, and the branch pipe device 16 as in the above embodiment. Be prepared. In the present embodiment, the concrete product main body 12 is made of, for example, a U-shaped groove main body 13 as in the first embodiment. As shown in FIG. 16A, in the present embodiment, the coma member 14 has a shape similar to that of FIGS. 9 and 10, for example, and a step portion 68 is provided on the tapered side surface and is tapered from an intermediate position. The sides are enlarged. That is, the top member 14 has a first tapered portion 64 having a tapered side surface that expands from the inside of the concrete product body toward the outer surface of the side wall 14, and the cross section gradually increases toward the outer surface side of the side wall 20, and the side wall 20. A second tapered portion 66 having a tapered side surface that expands from an intermediate position of the thickness toward the outer surface of the side wall 20 and gradually increasing in cross section toward the outer surface of the side wall 20, a first tapered portion 64, and a second tapered portion 66. Includes a stepped portion 68 that is interposed in the joint portion of the above and forms a stepped portion between the first tapered portion 64 and the second tapered portion 66. For example, it is advisable to apply a water blocking agent made of silicon to the step portion 68. The inclination angle α2 with respect to the pull-out direction of the coma member 14 from the inside to the outside of the side wall 20 on the tapered side surface of the second tapered portion 66 is the pull-out direction of the coma member 14 on the tapered side surface of the first tapered portion 64. It is provided at an angle larger than the inclination angle α1 with respect to (FIG. 16A, α2> α1). As a result, when the top member 14 is punched out from the side wall 20 or pulled out to form a through hole 30, the through hole 30 is formed by the first and second tapered portions, as shown in FIG. 16 (b). The first hole portion 70 formed at a position from the inner surface side of the side wall 20 and the first hole portion 70 expanded from the first hole portion 70 and formed at a position from the outer surface of the side wall 20 according to 64, 66 and the step portion 68. It is formed by a second hole portion 72. The top member 14 has a U-shaped groove made of concrete when the top member 14 is pulled out from the side wall 20 to form a through hole 30 by forming the inclination angle α2 of the second tapered portion 66 at a relatively large inclination angle. It is possible to satisfactorily prevent the occurrence of so-called edge chipping, in which a part of the side wall 20 of the main body 13 or a part of the coma member is chipped, and a through hole 30 having a neat shape can be formed. Therefore, the through hole 30 can be formed in a short time, smoothly, and surely without post-treatment of edge chipping after removing the coma member or generating concrete scraps. The size ratio of the first taper portion 64 and the second taper portion 66 may be arbitrarily set, or the inclination angles α1 and α2 with respect to the extraction / removal direction may be set to the same angle.

In the present embodiment, as shown in FIGS. 15 and 17, the fitting mounting portion 44B as the mounting portion 38 of the branch pipe device 16 is composed of a block previously formed of resin concrete, and the thickness of the block is increased. It is set smaller than the thickness of the side wall 20 of the U-shaped groove main body 13. The fitting mounting portion 44B is set to, for example, about half the thickness of the side wall 20, that is, the length of the through hole 30 in the penetrating direction. For example, since resin concrete has higher strength than concrete, the required strength can be secured even if the width is set small. As a result, even when resin concrete is used, the manufacturing cost of the branch pipe block 42 can be suppressed. In a state where the fitting mounting portion 44B made of a thin block is fitted and mounted in the through hole 30, as shown in FIG. 17, the fitting mounting portion 44B is inserted to the end on the inner surface side of the side wall of the through hole 30 to form the U-shaped groove main body. The inner surface side of the side wall 20 facing the inner side is flush with the end portion of the fitting mounting portion 44B. Further, in this state, a gap recess 82 recessed from the outer surface of the side wall is formed on the outer side of the side wall where the fitting mounting portion 44B of the through hole 30 is not provided. The gap recess 82 may be backfilled with soil or the like after the cable branching work, for example. Further, in the present embodiment, the insertion recess 74 is recessed on the side surface of the fitting mounting portion 44B in a part of the side wall 20 facing the through hole. For example, when the insertion recesses 74 are mounted in the through holes, a total of two insertion recesses 74 are provided at positions facing each other in the vertical direction. As shown in FIG. 18, a saw blade-shaped uneven receiving portion 76 is formed on the bottom side of the recessed recess 74.

In the present embodiment, for example, an adhesive such as epoxy resin is applied to the side surface of the fitting mounting portion 44B, and the fitting is inserted into the through hole 30 of the side wall 20. As shown in FIGS. 15 and 18, in a state where the fitting mounting portion 44B is fitted and mounted in the through hole 30 of the side wall 20, the inner wall surface of the first hole portion 70 of the through hole 30 and the fitting mounting portion A wedge member 78 is driven from the outer side of the side wall 20 into the insertion recess 74 of the 44B and is inserted in close contact with the insertion recess 74. The wedge member 78 can maintain the fitting and mounting state of the fitting and mounting portion 44B in the through hole 30. As a result, for example, when the adhesive is applied to the fitting mounting portion 44B of the branch pipe device 16 and mounted in the through hole 30 of the side wall 20, the mounting state is strengthened even for the time until the adhesive is completely solidified. Since the branch pipe device 16 can be reliably prevented from slipping or coming off, it is possible to proceed with other work of cable branching or to backfill the soil around the U-shaped groove after the branching work. You can smoothly proceed with the work. Therefore, for example, the work can be smoothly proceeded without interrupting the construction due to the solidification time of the adhesive for fixing the fitting mounting portion, which can contribute to shortening the entire construction period. The wedge member 78 is made of, for example, a material such as a hard synthetic resin such as polypropylene, and is provided in a substantially triangular cross section. A saw blade-shaped uneven portion 80 in which a plurality of irregularities are repeatedly formed on the side surface of the wedge member 78 that abuts on the insertion recess of the fitting mounting portion 44B or the portion that abuts on the inner surface of the through hole of the side wall. Is formed. When the wedge member 78 is driven and inserted between the through hole 30 and the insertion recess 76 of the fitting mounting portion 44B, the uneven portion 80 engages with the uneven receiving portion 76 on the fitting mounting portion 44B side in a meshing manner. .. The size and number of the insertion recess and the wedge member may be arbitrary. Further, when driving the wedge member, depending on the size, material, etc., the wedge member may be hit directly with a hammer or the like, or may be hit through a wood. Further, the uneven shape of the uneven portion of the wedge member is not limited to the saw blade shape, and may be any shape, and may be provided on the entire side surface of the wedge member.

As shown in FIG. 15, in the present embodiment, the partition members 26a for dividing the internal space of the U-shaped groove main body 13 are formed in a rod shape, and a plurality of partition members 26a are formed at predetermined intervals in the longitudinal direction of the U-shaped groove main body 13. This is installed side by side. As in the first embodiment, the U-shaped groove main body 13 may be provided with a fall prevention net 46 or the upper side may be closed with a lid after the cable is branched.

Further, as shown in FIGS. 19 and 20, the concave-convex receiving portion 84 that engages with the concave-convex portion 80 of the wedge member 78 may be provided on the inner wall of the through hole 30 of the side wall 20 of the U-shaped groove main body. .. In this embodiment, the top member 14 is provided with the first tapered portion 64 and the second tapered portion 66 at about half the thickness of the side wall 20, that is, the length of the through hole 30 in the penetrating direction in cross-sectional view. There is. Therefore, when the fitting mounting portion 44B is fitted and mounted in the through hole 30 of the side wall 20, the upper surface of the block that is fitted into the first hole portion 70 and forms the fitting mounting portion 44B is the first. The position is substantially the same as the stepped portion between the hole portion and the second hole portion. Similarly to the above, it is preferable to apply, for example, a water blocking agent made of silicon to the stepped portion 68 joining the first tapered portion 64 and the second tapered portion 66. As shown in FIG. 20 (c), when the frame member 14 is punched out or pulled out to form a through hole 30, the lengths of the first hole portion 70 and the second hole portion 72 in the penetration direction are approximately the same. Formed the same. Further, an inclined hole portion corresponding to the shape of the edge portion 86 of the coma member 14 is formed at the outer surface side end portion of the side wall 20 of the through hole 30. The fitting mounting portion 44 is provided with a cross-sectional width substantially the same as the length of the first hole portion 70 in the penetrating direction in a cross-sectional view. Further, the inclination angles of the first tapered portion 64 and the second tapered portion 66 with respect to the pull-out direction are set to the same degree. A flange-shaped edge portion 86 having an inclined surface having an inclination angle larger than the inclination angle of the second tapered portion 66 is formed at the outer end portion on the outer side surface side of the side wall of the coma member 14. By providing the inclined edge portion 86, it is possible to prevent post-treatment of edge chipping on the side wall surface after the top member 14 is removed and the generation of concrete scraps and the like.

As an example of forming the through-hole uneven receiving portion 84 of the side wall 20, as shown in FIG. 20A, the plate is made of hard synthetic resin and has the same uneven shape as the uneven portion 80 of the wedge member 78 formed on one side. The shaped mold member 88 is formed in advance, and the mold member 88 is fixed to a predetermined position on the first tapered portion 64 of the top member 14 with an adhesive. With the mold member 88 attached to the top member 14, the mold member 88 is fixed to the mold of the concrete product main body 12 and concrete is cast to form the concrete product main body. As shown in FIG. 20B, the top member 14 is embedded in the side wall 20 in a state where the mold member 88 is integrated. When it is necessary to branch the cable, as shown in FIG. 20 (c), the frame member 14 is punched out or pulled out to form a through hole. At this time, the coma member 14 is separated from the side wall 20, but the adhesive portion of the mold member 88 is detached from the coma member 14, and the mold member 88 remains embedded in the side wall 20. As shown in FIG. 20D, when the mold member 88 is separated from the side wall 20 by a tool such as a hand or a screwdriver, the concave-convex shape corresponding to the concave-convex shape of the mold member 88, that is, the concave-convex shape of the wedge member 78. Concavo-convex receiving portion 84 is formed. The method of forming the uneven receiving portion 84 may be arbitrary. Further, the uneven receiving portion may be provided only on the inner wall side of the through hole 30 of the side wall 20. As shown in FIG. 19, when the fitting mounting portion 44B is fitted in the first hole portion 70 of the through hole 30, the uneven receiving portion 76 of the fitting mounting portion 44B and the unevenness on the inner wall side of the through hole 30 are formed. The receiving portions 84 are opposed to each other, and the insertion recess 74 of the wedge member 78 is formed between them. When the wedge member 78 is driven into the insertion recess 74, the concave-convex portion 80 of the wedge member 78 engages with both the concave-convex receiving portions 76 and 84 in a meshing manner to more reliably prevent the fitting mounting portion from slipping or detaching. It is possible to maintain an appropriate wearing state.

Next, a fourth embodiment of the concrete product for cable storage / branching of the present invention will be described with reference to FIGS. 21, 22, and 23. The same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. As shown in FIGS. 21, 22, and 23, the cable storage / branching concrete product 10-4 of the present embodiment includes the concrete product main body 12, the top member 14, and the branch pipe device 16 as in the above embodiment. And. In the present embodiment, the concrete product main body 12 is made of, for example, a U-shaped groove main body 13 as in the first embodiment. In the present embodiment, instead of the wedge member 78 of the above embodiment, the fixing auxiliary member 90 for preventing the fitting mounting portion 44C fitted and mounted in the through hole 30 of the side wall 20 from coming off or slipping from the through hole 30 is provided. I have. The fixing auxiliary member 90 is made of, for example, a concrete screw 92, and the side wall 20 and the side wall 20 are provided near the contact portion between the through hole 30 of the side wall 20 and the fitting mounting portion fitted and mounted in the through hole of the side wall. It is engaged so as to straddle the fitting mounting portion 44C and bite into it. The concrete screw 92, for example, straddles the side wall 20 and the fitting mounting portion 44C and is engaged with the concrete screw 92 in a spiral manner so as to sandwich the central axis so that one substantially half portion bites into the side wall 20 and the other. A substantially half portion is made to bite into the fitting mounting portion 44C and screwed into the fitting mounting portion 44C to be fixed.

In the present embodiment, as shown in FIG. 23, the top member 14 is provided with, for example, a first tapered portion 64, a second tapered portion 66, a stepped portion 68, and an edge portion 86, and the first tapered portion 64 and the second tapered portion 64. The tapered portion 66 is provided at about half the thickness of the side wall 20, that is, the length of the through hole 30 in the penetrating direction in cross-sectional view. Further, as shown in FIG. 23A, a ridge portion 94 is formed at a predetermined position on the tapered side surface of the first taper portion 64 of the coma member 14. As shown in FIG. 23 (b), the side wall 20 is formed in a state where the top member 14 integrally formed with the convex portion 94 is embedded, but as shown in FIG. 23 (c), the top member 14 When the through hole 30 is formed by pulling out from the side wall 20, a groove 96 for a pilot hole is formed at a predetermined position of the first hole 70 according to the shape of the ridge 94.

As shown in FIGS. 21 and 23, the peripheral wall of the fitting mounting portion 44C is located at a position corresponding to the position where the prepared hole groove 96 of the first hole portion 70 formed on the side wall 20 side is provided. A recessed groove 98 for a pilot hole is formed. As shown in FIG. 23 (d), when the fitting mounting portion 44C is fitted and mounted in the through hole 30 of the side wall 20, an elongated pilot hole is formed by the combination of the prepared hole recesses 94 and 96. Will be done. By screwing the concrete screw 92 using this pilot hole, as shown in FIG. 22, the concrete screw 92 is spirally bitten and engaged with the side wall 20 and the fitting mounting portion 44C. It is also possible to form pilot holes for concrete screws at the site without providing the groove 96 and 98 for pilot holes in the side wall 20 and the fitting mounting portion 44C in advance, but it is possible to generate waste and dust at the site. It is preferable to provide the groove 94, 96 for the pilot hole in order to suppress it. Further, the fixing auxiliary member 90 is not limited to the concrete screw as described above, and may be any other optional member such as a pile-shaped member with a barb or a hook-shaped member.

The concrete product for cable storage / branching of the present invention described above is not limited to the configuration of only the above-described embodiment, and is arbitrarily modified as long as it does not deviate from the essence of the present invention described in the claims. May be done.

The concrete product for storing and branching cables of the present invention can be suitably used, for example, when burying cables and electric wires such as electric wires and communication lines in the ground.

10 Concrete products for cable storage and branching 12 Concrete product body 14 Frame member 16 Branch pipe device 18 Bottom wall 20 Side wall 22 Internal space 26 Partition member 30 Through hole 32 Lid body 38 Mounting part 40 Branch path forming pipe 42 Frame type block 44 Fitting Combined mounting part 46 Fall prevention net 48 Hook member 64 1st taper part 66 2nd taper part 68 Step part 74 Insertion recess 76 Concavo-convex receiving part 78 Wedge member 80 Concavo-convex part 86 Concavo-convex receiving part 90 Fixing auxiliary member 92 Concrete screw

Claims (13)

A concrete product body including a bottom wall and a side wall formed by rising from the bottom wall, and having an internal space for accommodating cables inside.
A tapered coma member that is integrally formed with the side wall so that both end faces are embedded in the inner and outer surfaces of the side wall of the concrete product body, and the cross section gradually increases from the inside to the outside of the side wall. A coma member that is provided so as to be removable by punching or pulling out from the inside to the outside and that can form a through hole in the side wall when separated from the side wall.
The fitting mounting portion that is closely fitted to the through hole formed by separating the top member from the side wall and the fitting mounting portion that communicates internally with the internal space of the concrete product body and inserts cables are integrated with the fitting mounting portion. A concrete product for cable storage and branching, which is characterized by being equipped with a branch path formed in, and a branch pipe device including. The concrete product for cable storage / branching according to claim 1, wherein the fitting mounting portion is made of resin concrete or a top-shaped block previously formed of concrete having substantially the same outer shape as the top member. The branch path is characterized in that one end is fixed to the fitting mounting portion and the other end has a branch path forming pipe that protrudes toward the outside of the side wall while communicating internally with the internal space of the concrete product body. The concrete product for cable storage / branching according to claim 1 or 2. The branch road includes a first branch road portion provided in the fitting mounting portion so as to communicate with the internal space of the concrete product body.
It is composed of a pipe member whose one end is fixed to the fitting mounting portion, and is provided with a second branch path forming pipe which internally communicates with the first branch path of the fitting mounting portion to form a second branch path portion. The concrete product for cable storage / branching according to claim 1 or 2, characterized in that. The claim is characterized in that the concrete product body is provided with a fall prevention net that is detachably attached to the inside of the side wall so as to prevent the lid that opens and closes above the concrete product body from falling into the internal space. The concrete product for cable storage / branching according to any one of Items 1 to 4. The concrete product for cable storage / branching according to claim 5, further comprising a hook member for locking the fall prevention net on the upper side of the side wall. According to any one of claims 1 to 6, the internal space of the concrete product body is provided with a partition member erected on the bottom wall so as to divide the space for accommodating cables into a plurality of spaces. The listed concrete products for cable storage and branching. The coma member has a first tapered portion having a tapered side surface that expands from the inside of the concrete product body toward the outer surface of the side wall, and the cross section gradually increases toward the outer surface side of the side wall.
A second tapered portion having a tapered side surface that expands from the intermediate position of the thickness of the side wall of the concrete product body toward the outer surface of the side wall, and the cross section gradually increases toward the outer surface of the side wall.
Includes a stepped portion that is interposed between the first tapered portion and the second tapered portion and forms a step between the first tapered portion and the second tapered portion.
The inclination angle of the tapered side surface of the second tapered portion with respect to the extraction / removal direction of the coma member from the side wall is provided at an angle larger than the inclination angle of the tapered side surface of the first tapered portion with respect to the extraction / removal direction of the coma member from the side wall. The concrete product for cable storage / branching according to any one of claims 1 to 7, wherein the concrete product has been obtained. The fitting mounting portion has an insertion recess in which a part of the side surface facing the through hole of the side wall of the concrete product is recessed.
It has a wedge member that is inserted in close contact between the inner wall of the through hole and the insertion recess of the fitting mounting portion from the outer side of the side wall to hold the fitting mounting state of the fitting mounting portion. The concrete product for cable storage / branching according to any one of claims 1 to 8. 9. The invention according to claim 9, wherein the wedge member includes a concavo-convex portion in which a plurality of concavities and convexities are repeatedly formed in a part or all of a portion of the fitting mounting portion that abuts on the inner surface of the insertion recess or the through hole of the side wall. Concrete products for cable storage and branching. The insertion recess of the fitting mounting portion and / or the inner wall of the through hole of the side wall is characterized in that a concave-convex receiving portion that meshes with the concave-convex portion when the wedge member is inserted is formed. The concrete product for cable storage / branching according to claim 10. The side wall of the concrete product and the fitting mounting portion fitted and mounted in the through hole of the side wall are engaged with each other so as to bite into the side wall and the fitting mounting portion in the vicinity of the fitting contact portion. The concrete product for cable storage / branching according to any one of claims 1 to 11, further comprising a fixing auxiliary member for preventing the fitting mounting portion from coming off from the through hole. The concrete product for cable storage / branching according to claim 12, wherein the fixing auxiliary member comprises a concrete screw that spirally bites and engages with the side wall and the fitting mounting portion.

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