JP2004040964A - Gable wall with bellmouth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gable wall with bellmouth which can be quickly and easily manufactured to be adapted to individual sites, facilitates field work to shorten an execution time, and prevents damage to cables. <P>SOLUTION: The gable wall 1 with bellmouth is provided with a round through hole 2 into which cables can be inserted. The gable wall made of resin concrete is to be installed on piping installations buried under ground. The periphery of one end of the round through hole 2 is rounded to form a bellmouthed portion 4. Since the gable wall 1 with bellmouth is made of resin concrete, its thickness can be reduced with its strength maintained. As a result, materials used in it is reduced, and its molding time is shortened. Further, since the bellmouthed portion 4 and the body 7 of the gable wall are integrally formed, the bearing strength of the gable wall is not reduced. At the same time, the bellmouthed portion 4 is prevented from being separated from the body 7 of the gable wall due to the weight of cables applied to the bellmouthed portion 4. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a dam wall with a bell mouth attached to an end of a bellows tube for burying a power cable, a communication cable, and the like in the ground.
[0002]
[Prior art]
Flexible pipes for accommodating these cables are used for underground installation work such as power cables and communication cables and construction equipment construction. At a branch portion of the cable arranged underground, equipment called a handhole having a space inside is arranged. The flexible tube is connected to the handhole, and the cable branches in the space of the handhole. The cable bundled after being branched is inserted into another flexible tube having a different diameter arranged at another place in the handhole and placed underground. Here, the flexible tube refers to a tube having a groove having a cross-sectional waveform, and includes a corrugated tube having a groove formed in a spiral shape, as well as a bellows tube having a large number of circular grooves.
[0003]
The handhole includes a U-shaped block in which opposing side walls and a bottom plate are integrally formed, and an end wall that closes the opposing side opening of the U-shaped block. The end wall is attached to the U-shaped block by a fastening means such as a bolt via a waterproof packing. The flexible tube is attached to the through hole formed in the end wall in a waterproof state.
[0004]
When branching a cable, first, the required number and size of through holes formed in the end wall are obtained from a bundle of branched cables. Since this work is performed at the time of design for each site, considering that the concrete masonry wall will be manufactured later by molding, the factory side will be notified of the number and size of the required through holes and The formwork is adjusted, and the casting and curing are performed. If such work is performed with concrete using cement, a long curing time is required. Therefore, in general, a circular concave portion is formed in advance on a concrete masonry wall to make a thin wall portion, and a predetermined diameter is set at a site. In many cases, the through-hole is formed by breaking the thin portion of. At this time, since a corner is formed in the cross section at the end of the through hole, a finishing process is required. In addition, when the through holes are adjacent to each other, the interval between the through holes is several centimeters and the side walls are thin, so that the splitting work for forming the through holes must be carefully performed, which requires time and labor, and furthermore, the strength. Also decrease.
[0005]
When the cable is inserted into the through hole, a bell mouth tube made of high-density polyethylene or the like having a trumpet-shaped opening is inserted through the through hole in order to prevent the cable from touching the end of the through hole and being damaged. Often fixed.
[0006]
FIG. 4 is an explanatory view showing a use state of a conventional spiral tube body mounting connector. As shown in FIG. 4, for example, a connector 70 for attaching a helical tube described in Japanese Patent Application Laid-Open No. H11-266519 inserts a bellmouth tube 72 from outside a through hole of a wife wall 71, and A bellmouth tube 72 is screwed into the inner peripheral portion of the corrugated tube 73 from the inside, and the corrugated tube 73 and the end wall 71 are fixed by a holder 75 via a watertight packing 74.
[0007]
In addition, instead of a bellmouth tube, a system in which a block forming a bellmouth is attached to an opening formed in a wife wall has been devised.
FIG. 5 is an explanatory diagram showing a use state of another conventional bell mouth block.
As shown in FIG. 5, for example, in a bell mouth block 80 described in Japanese Patent Application Laid-Open No. Hei 9-144951, a socket member 82 is disposed in a front-rear direction within a hard foamed polyurethane block 81, and one end thereof is formed in a bell mouth shape. It is connected to the opening 83. The bellmouth block 80 is fixed to the wife wall 86 by a mortar 87. A bellows tube 84 is arranged inside the socket member, and the bellows tube 84 is fixed to the other end of the socket member 82 by a base 85.
[0008]
[Problems to be solved by the invention]
However, since corrugated pipes and bellows pipes are used by being buried underground, both hardness and weight are formed larger than indoor duct pipes and the like. Therefore, the connector 70 for attaching the corrugated tube 73 to the outside of the bell mouth tube 72 requires the bell mouth tube 72 at the time of manufacturing, so that the number of parts is increased, and the bell mouth tube 72 is inserted. When the weight of the cable to be used is large, there is a problem that the end of the bell mouth tube 72 is deformed by the weight of the cable, and the waterproof performance is impaired.
[0009]
On the other hand, the bellmouth block 80 is fixed to the wife wall 86 with the mortar 87, so that the next operation cannot be performed until the solidified, and there is a problem that the construction time on site becomes long. Further, the bellmouth block 80 has the bellows tube 84 arranged and fixed inside, but since the minimum diameter of the opening 83 is equal to the outer diameter of the bellows tube 84, when the cable is inserted, There is a problem that the cable may be caught on the end of the bellows tube 84 and the cable may be damaged.
[0010]
The problem to be solved by the present invention is to provide a quick-and-easy-to-manufacture system for each site, to facilitate on-site work, reduce construction time, and prevent damage to cables. Is to provide.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the dam wall with a bell mouth of the present invention has a through round hole through which a cable can be inserted, and a resin concrete dam wall attached to a piping facility buried underground. A bell mouth portion formed by rounding a corner is formed on the outer periphery of one end of the round hole.
[0012]
Since the wall with bell mouth is made of resin concrete, it can be formed to be thin while maintaining the strength, and the material is reduced and the molding time is shortened. And since the bell mouth part is formed, the cable does not contact the end of the through-hole at the time of insertion of the cable, and since the bell mouth part and the main body are formed integrally, The supporting strength of the wife wall does not decrease, and the bell mouth portion does not separate from the wife wall main body due to the weight of the cable added to the bell mouth portion. Further, no concentrated load is applied between the bellmouth portion and the main body of the rear wall, and the weight of the cable is evenly distributed and transmitted to the rear wall.
[0013]
At the other end of the through-hole, an annular enlarged groove communicating with the through-hole is formed, and in this enlarged-diameter groove, the outer periphery of one end is adhered and fixed. By providing a sheath tube having a diameter larger than the diameter, the shape of the mold can be simplified.
[0014]
When the sheath tube is provided, the cable is guided linearly when inserted, and the force applied to the cable can be reduced by increasing the area of the supporting portion, thereby preventing disconnection. Further, when attaching the flexible tube, the attachment strength can be increased because the flexible tube is adhered to the inner peripheral portion of the sheath tube.
[0015]
At the radially outer portion of the through-hole, an annular groove is formed concentrically with the through-hole, and one end of the annular groove is adhered and fixed to the annular groove. When the sheath tube having a diameter larger than the diameter is provided, the length of the through-hole becomes long, the area for receiving the load of the cable is widened, and the load of the cable can be dispersed and supported.
[0016]
When the inner peripheral surface of a portion connected to the through-hole of the sheath tube is formed by gradually reducing the diameter toward the bell mouth side, when a flexible tube is inserted into the sheath tube, the inner periphery of the sheath tube is reduced. The outer periphery of the end of the flexible tube comes into contact with the flexible tube. When fixed in this state, the center of the sheath tube and the center of the flexible tube substantially coincide with each other, so that the center of the through-hole and the center of the flexible tube also substantially coincide with each other.
[0017]
If a surface treatment layer for reducing the friction coefficient is formed on the bell mouth portion, the sliding resistance at the time of inserting the cable is reduced.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
(First Embodiment)
FIG. 1 is a partially enlarged cross-sectional view of a marsh wall with a bell mouth according to a first embodiment of the present invention, and FIG. 2 is a front view of the marsh wall with a bell mouth.
[0019]
As shown in FIGS. 1 and 2, a dam wall 1 with a bell mouth according to the present invention is made of resin concrete in which an aggregate is bonded by using a resin (resin) as a bonding material, and a through-hole 2 through which a cable can be inserted. Is formed, and has a main wall body 7 fixed to the opening of the U-shaped block to form a hand hole and buried in the ground, and a sheath tube 6 provided in each of the through-holes 2. .
[0020]
As shown by a two-dot chain line in FIG. 2, the through-hole 2 is formed (by a mold) in any part of a large number of circular openings 3 having different diameters at the time of manufacturing at a factory. A large number of reinforcing bars (not shown) are arranged crosswise in the vertical and horizontal directions inside the position avoiding the scheduled opening portion 3.
[0021]
As shown in FIG. 1, a trumpet-shaped bell-mouth portion 4 having rounded corners is formed on the outer periphery of one end of the through-hole 2. The end of the corrugated pipe 9 is formed so as to open outward, and the inner diameter D1 of the through-hole 2 is the inner diameter of the end of the corrugated pipe 9 which is an example of a flexible pipe fitted into the sheath pipe 6. D6 or smaller. The inner diameter D1 of the through-hole 2 is formed to be substantially the same as or slightly larger than the minimum inner diameter D2 of the corrugated pipe 9. With this configuration, the cable inserted from the through-hole 2 contacts the inclined surface of the inner surface of the corrugated pipe 9 gently ascending, and then comes into a state close to a point contact with the protruding portion having a rounded inner surface. It is supported and inserted through the corrugated pipe 9.
[0022]
At the other end of the through-hole 2, an annular enlarged groove communicating with the through-hole 2 is formed so as to be centered on the through-hole 2.
The outer periphery of one end of the cylindrical sheath tube 6 is adhered and fixed in a water-tight state by an adhesive 13 to the enlarged diameter groove portion 5. The minimum inner diameter of the sheath tube 6 is formed larger than the diameter of the through-hole 2.
[0023]
The sheath tube 6 is formed of, for example, resin concrete, but it is also possible to use another resin material such as a vinyl chloride resin.
The inner peripheral surface 8 on one side of the sheath tube 6 (the end wall main body 7 side) is formed so as to be gradually reduced in diameter toward the bell mouth portion 4 side. A corrugated tube 9 is inserted into the sheath tube 6 from the other side.
[0024]
The minimum inner diameter D3 at one end of the inner peripheral surface 8 of the sheath tube 6 is formed smaller than the outer diameter D4 of the corrugated tube 9, and the maximum inner diameter D5 at the other end is formed larger than the outer diameter D4 of the corrugated tube 9. ing.
[0025]
The wife wall main body 7 is molded at a factory.
When the required diameter and the required number of corrugated pipes 9 are determined from the site by contact from the factory, etc., the required number of through-holes 2 having the same size as the inner diameter of the corrugated pipe 9 are used to form the wife wall body 7 using a mold. It is manufactured by molding. In the case of concrete masonry walls, curing with molds takes a long time to cure, so it will not be in time for delivery, but using resin concrete will shorten the hardening and curing time compared to cement concrete. Can be manufactured in a short time according to
Then, the sheath tube 6 is adhered at a factory to complete the end wall 1 with a bell mouth and transported to the site.
[0026]
Next, the construction state at the site will be described.
At the site, first, the wife wall 1 with a bell mouth is attached to both sides of a U-shaped block (not shown). As shown in FIG. 2, a waterproof packing (not shown) is disposed in a U-shaped groove portion 11 on both sides and a lower peripheral portion of the bellows wall 1 with a bell mouth, and both sides and a lower portion are provided. A bolt (not shown) is inserted through a bolt insertion hole 12 provided at a location, and the bolt is inserted through a bolt insertion hole formed at an end surface of the U-shaped block, and a nut is screwed and fastened. .
[0027]
Next, as shown in FIG. 1, the corrugated pipe 9 is attached.
The filler 10 is applied to the outer peripheral portion on the front side of the corrugated tube 9 and inserted into the sheath tube 6 from the other side. The distal end of the corrugated pipe 9 comes into contact with the inner peripheral surface 8 of the tapered sheath pipe 6 and stops. In this state, the filler 10 is solidified. By bringing the corrugated tube 9 into contact with the inner peripheral surface 8 of the sheath tube 6, the center position of the corrugated tube 9 automatically matches the center position of the sheath tube 6 and the through-hole 2. Since the sheath tube 6 is tapered, the outer diameter of the corrugated tube 9 to be used can be used as long as the sheath tube 6 has a minimum diameter D3 or more and a maximum diameter D5 or less.
[0028]
Then, a cable is inserted from the bellmouth part 4 side of the bell wall with bellmouth 1. The weight of the cable is first applied to the bell mouth portion 4 of the main body 7 and then gradually dispersed and supported by the small diameter portion of the corrugated pipe 9. In addition, the weight applied to the end of the corrugated pipe 9 is transmitted to the main body 7 via the sheath pipe 6. As described above, since the on-site bonding operation is performed only between the corrugated tube 9 and the sheath tube 6, the operation can be performed easily and quickly, and the construction period can be shortened.
[0029]
Next, the dimensions of each part of the bell wall 1 with bellmouth will be described.
The diameter D1 of the through-hole 2 is determined according to the diameter of the bundle of cables to be inserted and the inner diameter of the corrugated pipe 9 through which the bundle of cables is inserted.
[0030]
The dimension d2 of the bell mouth part 4 in the cable insertion direction may be set to a dimension that does not deform the bell mouth part 4 due to the weight of the cable applied to the bell mouth part 4.
[0031]
The length L1 of the sheath tube 6 is equal to the bonding length of the filler 10 filled between the end of the corrugated tube 9 and the corrugated tube 9, and the corrugated tube 9 does not come off when the cable is inserted. The length may be any length, and the thickness is set to, for example, about 100 to 300 mm in consideration of formation of a mold and workability.
[0032]
The length L2 of the inner peripheral surface 8 of the sheath tube 6 may be smaller than the depth d3 of the enlarged diameter groove portion 5 so that the distal end position of the corrugated tube 9 is close to the through-hole 2 so that the cable can be smoothly inserted. preferable.
[0033]
The depth d3 of the enlarged diameter groove 5 is set to be equal to the length of the bonding surface of the sheath tube 6, and when the cable is inserted, the weight of the cable and the earth pressure load placed on the sheath tube after construction It is only necessary that the depth is set to be greater than or equal to the depth at which the sheath tube 6 does not come off.
[0034]
The thickness d1 of the main wall 7 only needs to be large enough not to deform when the main wall 1 with bellmouth is used in the ground. Since the main wall 7 is made of resin concrete, it can be thinner than a normal concrete main wall mainly made of cement. In the first embodiment, it is also possible to round the corner of the connection portion between the through-hole 2 and the enlarged-diameter groove 5 over the entire circumference. With such a configuration, even if the cable comes into contact with a corner when transferring the cable from the bell mouth portion to the flexible tube or from the flexible tube to the bell mouth portion, breakage of the cable is reliably prevented.
[0035]
(Second embodiment)
FIG. 3 is a partially enlarged cross-sectional view of a married wall with a bell mouth according to a second embodiment of the present invention.
The dam wall 14 with a bell mouth according to the second embodiment has a through-hole 17 having a bell-mouth portion 4 at one end in a dam-wall body 19 made of resin concrete, and the other end of the through-hole 17 at the other end. An annular groove 15 is formed, and a sheath tube 16 is provided in the annular groove 15. Note that portions having the same shape as the bellmouth-attached wall 1 of the first embodiment are assigned the same numbers, and descriptions thereof are omitted.
[0036]
The annular groove portion 15 is formed concentrically with the through-hole 17 at the other end of the through-hole 17 of the end wall main body 19 and on the outer side in the radial direction.
The sheath tube 16 is provided with a sleeve portion 18 that can be inserted into the annular groove portion 15 at one end of the sheath tube 6 of the first embodiment. Since the outer and inner surfaces of the sleeve 18 can be bonded to the annular groove 15, the bonding strength of the sheath tube 16 is increased, and the depth d4 of the annular groove 15 can be reduced.
In addition, since the cylindrical inner surface of the through-hole 17 becomes longer, the length in the width direction of the bell mouth portion 4 becomes longer, and the strength of supporting the cable increases.
[0037]
(Third embodiment)
The bell mouth with bell mouth according to the third embodiment is obtained by forming a surface treatment layer such as a gel coat layer to reduce the friction coefficient on the bell mouth portion 4 according to the first and second embodiments.
This surface treatment layer can be formed inside the through-hole in addition to the bell mouth portion 4.
When the weight of the cable to be inserted is large, the friction resistance of the bell mouth portion 4 becomes large and the surface is scraped, which may damage the cable. However, the formation of the surface treatment layer reduces the friction coefficient. Thus, wear of the bell mouth portion 4 and damage to the cable can be prevented.
As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above embodiments. For example, a bellows tube can be used for a flexible tube instead of a corrugated tube. . When the bellows tube 84 is used, the shape of the end portion is circular, so that the accuracy of the center alignment is improved.
[0038]
【The invention's effect】
According to the present invention, the following effects can be obtained.
(1) Since the wall with bell mouth is made of resin concrete, it can be formed to be thin while maintaining the strength, the material is reduced, the molding time is shortened, and the production time of the product can be shortened. Can respond quickly.
(2) Since the bell mouth portion is formed integrally with the wife wall, the weight of the cable that is applied to the bell mouth when the cable is inserted is dispersed and transmitted to the wife wall, so that the bell mouth portion is prevented from being deformed. And waterproofing can be reliably performed.
Further, there is no need to fix the bellmouth portion as a separate member to the end wall, so that the construction is simplified and the construction time on site can be reduced.
(3) When the enlarged diameter groove portion is formed so as to communicate with the other end portion of the through hole, the shape of the mold can be simplified, and the shape can be made more than when the enlarged diameter groove portion and the through hole are separately formed. It is simplified, and the strength of the wall can be prevented from being reduced, and a strong product can be manufactured.
(4) When the sheath tube is provided, the cable is guided linearly when it is inserted, and the force applied to the cable can be reduced by increasing the area of the supporting portion to prevent disconnection. Further, when attaching the flexible tube, the attachment strength can be increased because the flexible tube is adhered to the inner peripheral portion of the sheath tube.
(5) When the annular groove portion is formed outside the through-hole, the length of the through-hole becomes long, and the area for receiving the load of the cable is widened, so that the load of the cable can be dispersed and supported. Further, since both surfaces of the sheath tube can be bonded to the annular groove, the bonding strength can be increased and the mounting strength can be increased.
(6) When the diameter of the sheath tube is gradually reduced, the center of the sheath tube and the center of the flexible tube substantially coincide with each other, and the center of the through-hole and the center of the flexible tube also substantially coincide with each other. be able to.
(7) When a surface treatment layer for reducing the friction coefficient is formed on the bell mouth portion, the sliding resistance is reduced, and the insertion of the cable is simplified.
[Brief description of the drawings]
FIG. 1 is a partially enlarged sectional view of a married wall with a bell mouth according to a first embodiment.
FIG. 2 is a front view of the wife wall with the bell mouth.
FIG. 3 is a partially enlarged cross-sectional view of a wife wall with a bell mouth according to a second embodiment.
FIG. 4 is an explanatory view showing a use state of a conventional spiral tube mounting connector.
FIG. 5 is an explanatory diagram showing a use state of another conventional bell mouth block.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Wife wall with bell mouth 2 Penetration round hole 3 Scheduled opening part 4 Bell mouth part 5 Large diameter groove 6 Sheath tube 7 Wife wall main body 8 Inner peripheral surface 9 Corrugated tube (flexible tube)
DESCRIPTION OF SYMBOLS 10 Filler 11 Groove part 12 Bolt insertion hole 13 Adhesive 14 Wife wall with bell mouth 15 Annular groove part 16 Sheath tube 17 Through round hole 18 Sleeve part 19 Wife wall body

Claims (5)

A through-hole with a cable that can be inserted is formed, and in a resin concrete end wall that is attached to piping equipment buried underground,
A bell mouth portion with a bell mouth, wherein a bell mouth portion formed by rounding a corner is formed on an outer periphery of one end of the through-hole. At the other end of the through-hole, an annular enlarged-diameter groove communicating with the through-hole is formed. The end wall with a bell mouth according to claim 1, wherein a sheath tube formed to be larger than the diameter of the hole is provided. An annular groove concentric with the through-hole is formed in a radially outer portion of the through-hole, and one end of the through-hole is fixed to the annular groove by being adhered thereto. The end wall with a bell mouth according to claim 1, wherein a sheath tube formed to be larger than the diameter of the hole is provided. The inner peripheral surface of a portion of the sheath tube connected to the through-hole is formed so as to be gradually reduced in diameter toward the bell mouth portion. The wife wall with bell mouth described in the paragraph. 5. The bell-mouthed wall according to claim 1, wherein a surface treatment layer for reducing a coefficient of friction is formed on the bell-mouth portion.

Images