JP2004116125A - Joint unit of flexible hume pipe, manufacturing method for flexible hume pipe making use of the joint unit, joint unit of flexible box culvert and manufacturing method for flexible box culvert making use of the joint unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a flexible Hume pipe having sufficient cut-off efficiency/ earthquake resistance, bending performance as a joint and a box culvert. <P>SOLUTION: A cushion material 32 is adhered to the other wall of a partition wall 31 of an outside cylinder collar 3 with a T-shaped section erecting the partition wall 31 at right angles to the central inside in the direction of the axis with approximately the same outside diameter as that of a concrete section 11, and an end plate 41 having the same thickness or a slightly smaller width of the concrete section 11 is provided at a right angle to a joint section 14 through the cushion material 32. An inside cylinder 4 with a diameter smaller than an inside diameter of the outside cylinder collar 3 arranging one or a plurality of sealing compounds 33 to the outer circumferential surface is placed. A steel-made outside cylinder 5 with approximately the same outside diameter as that of the outside cylinder collar 3 is placed to the other end section 42 of the inside cylinder 4 from the other end section 3a of the outside cylinder collar 3 at an interval of a predetermined distance. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a joint unit for a flexible fume pipe used at a joint between a human hole (manhole) and a pipe (fume pipe), a boundary between a shaft and an existing ground, and a flexibility using the joint unit. The present invention relates to a method for manufacturing a fume tube, a joint unit for a flexible box culvert, and a method for manufacturing a flexible box culvert using the joint unit.
[0002]
[Prior art]
In a pipeline facility, as shown in FIG. 7, a joint f between a manhole d and a pipeline (fume pipe) e, a boundary g between a shaft j and an existing ground k, and a place h where geology and stratum change are shown. Is a disadvantage of the pipeline facility, and damage, extraction, displacement, cracks, etc. of the pipeline facility due to uneven settlement of the ground or ground deformation such as an earthquake are also caused by the joint f in the pipeline e of the pipeline facility. And concentrated on the first tube from manhole d. As a means to remedy such problems,
A. Flexible joint for manhole (for example, refer to Patent Document 1)
B. Flexible fume tube (for example, see Patent Document 2)
C.I. A method of cutting the fume tube to a predetermined length and fitting the joint portion to the bent / displaced portion; B. a method of manufacturing a fume tube having a length corresponding to a bending / displacement portion; There is a method of connecting a plurality of short tubes within the length of one standard tube (see FIG. 10).
In addition, the bending or displacement is absorbed by the above-described method to prevent the pipeline from being damaged. There is also a conventional flexible fume tube (for example, see Patent Documents 3 and 4).
[0003]
[Patent Document 1]
JP-A-58-90253 (page 1-2)
[Patent Document 2]
Japanese Utility Model Publication No. 59-19187 (pp. 277-279)
[Patent Document 3]
Japanese Utility Model Publication No. 4-1250 (pp. 335-339)
[Patent Document 4]
JP-A-9-119573 (pages 1-5)
[0004]
[Problems to be solved by the invention]
By the way, in recent years, the propulsion construction of sewage pipelines and communication / power pipelines buried underground tends to be deeper and longer distances due to overcrowding of underground spaces and increase in traffic volume.
As a result, the earth pressure and the propulsion force acting on the propulsion pipe are further increased, and the possibility that the flexible portion 1 is damaged during the propulsion construction is also increased. Therefore, at the time of propulsion construction, a reinforcing iron plate or a steel band a is attached to the inner surface of the pipe to protect the flexible portion l (see FIGS. 11 and 12), and these are removed after completion of the construction.
In addition, flexible tubes such as conventional Patent Documents 3 and 4 are:
I. Since the function of the flexible tube is inconsistent with the function required at the time of propulsion construction, it is necessary to protect the flexible part at the time of construction.
B. In the case of a small-diameter propulsion pipe, it is not possible to remove a reinforcing iron plate or attach a steel band for reinforcement because of a size that a worker cannot enter the duct for work.
C. In the case of a large-diameter propulsion pipe, the member cost increases as the diameter increases, and moreover, the work of installing a steel reinforcing band used during propulsion construction requires a great deal of labor.
D. The conventional flexible fume tube has a problem that the structure is complicated and expensive in order to achieve both flexibility and rigidity during propulsion construction.
Further, the flexible joint for manholes is expensive due to its complicated structure, and is complicated to mount. In addition, the method of C, in which the fume pipe is cut to a predetermined length and the joint portion is fitted to the bent / displaced portion, requires a lot of work such as securing a work space for cutting, waste disposal, and cost at the construction site. There's a problem.
Further, in the method of D 1 for manufacturing a fume tube having a length corresponding to a flexible portion, the number of the flexible tubes used between human holes is usually small, and the position of the flexible portion is also small. Therefore an alternative to capital level, is necessary to modify the mold there is a cost and time burden is not large realistic for each production.
In the method E described above, in which a plurality of short pipes are connected and arranged, for example, when a 1/3 pipe is manufactured (see FIG. 13), a partition ring b is provided at a predetermined position on a mold (outer mold 72). The partition ring b is fixed by welding or bolts, the embedded collars 12 are disposed at both ends of the formwork, the reinforcing bar cage 6 is disposed, and the openings b1 are provided on both sides of the partition ring b. Manufacturing. Further, in the case where 1/3 tube and 1/4 tube are manufactured, only two tubes can be manufactured in one mold due to the structure of the mold. As a result, there is a problem that the manufacturing efficiency is low.
The present invention has been made in view of the above problems, and has a joint unit for a flexible fume tube having sufficient earthquake resistance and joint bending performance, a method of manufacturing a flexible fume tube using the joint unit, and a method of manufacturing the same. An object of the present invention is to provide a joint unit of a flexible box culvert and a method of manufacturing a flexible box culvert using the joint unit.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a joint unit for a flexible fume pipe according to the first aspect of the present invention has an outer diameter substantially equal to the outer diameter of a concrete part, and has a partition wall standing upright on the inner surface at the center in the axial direction. A cushion material is adhered to the other wall of the partition wall in the outer cylinder collar having a mold cross section, and an end plate having a width equal to or slightly smaller than the thickness of the concrete portion is provided at right angles to the connection portion through the cushion material, and is provided on the outer peripheral surface. Arranges an inner cylinder having one or a plurality of sealing materials arranged so as to be able to stop water and having an inner diameter reduced from the inner diameter of the outer cylinder collar, and the outer diameter of the outer cylinder is substantially equal to the outer diameter of the other end of the inner cylinder. It is characterized in that a steel outer cylinder is arranged at a predetermined distance from the other end of the outer cylinder collar.
[0006]
According to a second aspect of the present invention, there is provided a joint unit for a flexible hue tube, wherein the inner cylinder according to the first aspect is provided with a hole substantially in the middle of the sealing material, and the inner cylinder is connected to the inner cylinder. Are provided standing upright at a right angle.
[0007]
Further, the method for manufacturing a flexible fume tube using the joint unit according to claim 3 of the present invention is characterized in that the one end side and the other end side in the axial direction of the fume tube to be centrifugally formed are provided with an outer frame and an embedded collar side. An outer frame is placed between the outer frame of the insert and the outer frame on the embedded color, and an outer mold is placed inside the outer frame of the insert and embedded inside the outer frame of the embedded color. An outer cylinder collar having a T-shaped cross section in which an outer diameter substantially equal to the outer diameter of the concrete portion and a partition wall is erected at a right angle on the inner surface in the axial direction center between the outer frame on which the collar is disposed and the outer frame on the embedded collar side. A cushion material is adhered to the other wall of the partition wall, and an end plate having a width equal to or slightly smaller than the thickness of the concrete portion is provided at right angles to the connection portion through the cushion material, and one or a plurality of end plates are provided on the outer peripheral surface. Water sealing material The inner cylinder whose diameter is smaller than the inner diameter of the outer cylinder collar is disposed, and a steel outer cylinder whose outer diameter is substantially equal to the outer cylinder collar is provided at the other end of the inner cylinder. A joint unit arranged at a predetermined distance from the end is disposed, and a reinforcing bar cage is disposed between one of the walls of the partition wall and the outer frame of the inlet and between the end plate and the outer frame on the side of the embedded collar, and manufactured by centrifugal molding. It is characterized by:
[0008]
Further, in the method for manufacturing a flexible fume tube using the joint unit according to claim 4 of the present invention, a plurality of the joint units according to claim 3 are arranged between the insertion mold and the embedded collar side outer frame. It is characterized by:
[0009]
A box culvert coupling unit according to a fifth aspect is characterized in that a box culvert is used instead of the fume tube according to the first or second aspect.
[0010]
Next, in the method for manufacturing a flexible box culvert using the joint unit according to claim 6, a bottom outer frame is arranged at the bottom, and both outer frames are arranged at both axial ends of the manufactured box culvert. In a mold assembled by arranging outer molds on both side surfaces between both outer frames, a partition wall having an outer diameter substantially equal to the outer diameter of the concrete portion and a partition wall standing upright on the inner surface at the center in the axial direction is provided. A cushion material is adhered to the other wall of the partition wall of the outer cylindrical collar having a mold cross section, and an end plate having a width slightly smaller than the thickness of the concrete portion is provided at right angles to the connection portion through the cushion material, and the outer peripheral surface is provided. Arranges an inner cylinder having one or a plurality of sealing materials arranged so as to be able to stop water and having an inner diameter reduced from the inner diameter of the outer cylinder collar, and the outer diameter of the outer cylinder is substantially equal to the outer diameter of the other end of the inner cylinder. Move the steel outer cylinder a specified distance from the other end of the outer collar. A predetermined number of joint units that are separately installed are arranged at predetermined locations corresponding to the characteristics of the installation location, and reinforced cages are arranged between one side wall of the bulkhead and the outer frame and between the end plate and the outer frame. After that, it is characterized in that it is manufactured by concrete driving and vibration molding.
[0011]
A method of manufacturing a flexible box culvert according to a seventh aspect is characterized in that a plurality of the joint units according to the fifth aspect are arranged between both outer frames.
[0012]
[Action]
The flexible fume tube is provided with an outlet outer frame and an embedded collar-side outer frame on one end side and the other end side in the axial direction of the fume tube to be centrifugally formed, and between the inlet outer frame and the embedded collar-side outer frame. The outer formwork is placed on the inside of the front outer frame, and the front formwork is placed on the inside of the front outside frame, and the embedded color is placed inside the outside frame on the embedded color side. An outer diameter substantially equal to the outer diameter of the concrete portion, a cushion material is adhered to the other wall of the partition in an outer cylindrical collar having a T-shaped cross section in which the partition is erected at a right angle on the inner surface at the center in the axial direction, and the cushion material is interposed. An end plate with a width equal to or slightly smaller than the thickness of the concrete part is provided at a right angle to the connection part, and one or more sealing materials are arranged on the outer peripheral surface so as to stop water. Place the inner cylinder with the diameter At the other end of the inner cylinder, a steel outer cylinder having an outer diameter substantially equal to that of the outer cylinder collar is provided with a joint unit arranged at a predetermined distance from the other end of the outer cylinder collar. Reinforcing cages are arranged between the outer frame of the insertion opening and between the end plate and the outer frame on the side of the embedded collar, and are manufactured by centrifugal molding.
In addition, the flexible box culvert has a bottom outer frame disposed at the bottom, two outer frames disposed at both ends in the axial direction of the manufactured box culvert, and outer mold frames disposed on both side surfaces between the two outer frames. The outer wall of the outer cylinder collar having a T-shaped cross-section having an outer diameter substantially equal to the outer diameter of the concrete portion and having the partition wall erected at a right angle on the inner surface at the center in the axial direction is disposed on the other wall of the partition wall. Adhesion of cushion material, through which an end plate of the same or slightly smaller width as the concrete part thickness is provided at right angles to the joint, and one or more sealing materials can be stopped on the outer peripheral surface The inner cylinder whose diameter is smaller than the inner diameter of the outer cylinder collar is disposed, and a steel outer cylinder whose outer diameter is substantially equal to the outer cylinder collar is provided at the other end of the inner cylinder, and the other end of the outer cylinder collar is provided. The joint unit, which is located at a predetermined distance from the To in correspondence predetermined number disposed in a predetermined position, and between the side outer frame from the one wall of the partition wall, after arranging the respective reinforcing bar cage between the side outer frame from the end plate, produced by a concrete-implanted vibropressed.
The joint unit, the flexible fume tube provided with the joint unit, and the flexible box culvert have sufficient waterproofness and earthquake resistance, and exhibit bending performance as a joint.
Further, in the case of a flexible fume tube in which a plurality of joint units are arranged, it is possible to cope with sharp curve propulsion.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
FIGS. 1 to 6 show an embodiment of the present invention. The first embodiment will be described with reference to FIGS. 3, 4 and 1. FIG.
One flexible fume pipe 1 is provided in accordance with conditions such as a junction between a human hole (manhole) and a pipe (fume pipe), a boundary between a shaft and an existing ground, and a place where geology or stratum changes. The joint unit 2 is arranged at a predetermined position in the axial direction and is subjected to centrifugal molding.
The outer cylinder collar 3 has an outer diameter substantially equal to the outer diameter of the concrete portion 11 of the flexible fume tube 1, and has a T-shaped cross section in which an inner wall at the center in the axial direction has a partition wall 31 erected at right angles. A cushion material 32 is adhered to the other wall 35 of the partition wall 31 of the outer cylinder collar 3, and an inner cylinder 4 whose diameter is smaller than the inner diameter of the outer cylinder collar 3 is arranged via the cushion material 32. A steel end plate 41 having the same or slightly smaller width as the thickness of the concrete portion 11 and having a hole 43 which is slightly larger than the inner diameter of the concrete portion 11 is formed in the connection portion 14 of the inner cylinder 4 at right angles. Is established.
In addition, on the outer peripheral surface of the inner cylinder 4, one or two or more plural seal members 33 are provided so as to be able to stop water and are separated by a predetermined distance. At the other end 42 of the inner cylinder 4, a steel outer cylinder 5 having an outer diameter substantially equal to that of the outer cylinder collar 3 is provided at a predetermined distance from the other end 3 a of the outer cylinder collar 3 via a ring 51. They are placed apart.
The inner cylinder 4 is provided with a hole 22 substantially at the center of the sealing material 33, and an injection cylinder 21 communicating with the hole 22 is provided inside the inner cylinder 4 so as to stand upright. The injection tube 21 is used for injecting a lubricating material or a water stopping agent (not shown) from the inside of the flexible fume tube 1.
The cushion material 32 is made of plastic, particle board, or the like.
A ring-shaped reinforcing bar 39 for preventing the outer cylinder collar 3 from coming off is arranged at an end of the outer cylinder collar 3, and a water stopping material 38 is arranged between the partition wall 31 and the reinforcing bar 39. Further, a ring-shaped reinforcing bar 37 is welded to the outer peripheral surface of the inner cylinder 4 to fix the seal material 33 at a width of the seal material 33. The reinforcing bar 39 is similarly arranged at the end of the inner cylinder 4.
FIGS. 5 and 6 relate to a second embodiment of the present invention. In order to prevent the outer cylinder collar 3 from being pulled out of the concrete portion 11, the outer cylinder collar 3 is bent in a curl shape at the end thereof. The formed stopper 31a is formed.
[0014]
Next, a method for manufacturing a flexible fume tube using the joint unit of the present invention, as shown in the first embodiment of FIG. On the side, an insertion outer frame 7 and an embedded color outer frame 71 are arranged, and an outer mold frame 72 is arranged between the insertion outer frame 7 and the embedded color outer frame 71. Further, an insertion mold frame 73 is arranged inside the insertion outer frame 7, and an embedding collar 12 is arranged inside the embedding color side outer frame 71.
Further, an outer diameter substantially equal to the outer diameter of the concrete portion 11 is provided between the outer frame 7 and the outer frame 71 on the embedding collar side. A cushion material 32 is adhered to the other wall of the partition wall 31 in the cylindrical collar 3, and an end plate 41 having the same or slightly smaller width as the thickness of the concrete portion 11 is provided at right angles to the connection portion 14 via the cushion material 32. On the outer peripheral surface, an inner cylinder 4 having one or a plurality of sealing materials 33 arranged so as to be able to stop water and having a diameter smaller than the inner diameter of the outer cylinder collar 3 is arranged. A joint unit 2 in which a steel outer cylinder 5 having an outer diameter substantially equal to that of the cylinder collar 3 is arranged at a predetermined distance from the other end 3a of the outer cylinder collar 3 is provided at a predetermined location in accordance with the characteristics of the installation location. Alternatively, a predetermined number is provided.
Reinforcing cages 6 are provided between the one wall 34 of the partition wall 31 and the outer frame 7 and between the end plate 41 and the outer frame 71 on the buried collar side. It is manufactured by centrifugal molding by tightening with bolts 8.
Further, FIG. 2 relates to a second embodiment showing a 1/3 pipe manufacturing method, in which a plurality of joint units 2 are disposed between the insertion mold frame 73 and the embedded collar side outer frame 71 and centrifugally molded. It is formed to exhibit sufficient waterproofness and seismic resistance and bending performance as a joint.
[0015]
Next, FIGS. 7 and 8 relate to an embodiment of a flexible box culvert, in which a box culvert 1a is used instead of the fume tube 1 of the third and fourth embodiments, and a joint unit 2 used. Has the same configuration as the joint unit 2 of the fume pipe 1 having a circular cross section, but the outer cylinder collar 3, the cushion material 32, the end plate 41, the sealing material 33, the inner cylinder 4, the outer cylinder 5, etc. Is formed so as to match.
[0016]
Next, in the method for manufacturing a flexible box culvert using the joint unit of the present invention, as shown in FIGS. At both ends in the axial direction, outer frames 74 on both sides are arranged, and form frames 7a assembled by disposing outer mold frames 72 on both side surfaces between the outer frames 74 are installed. The bottom outer frame 76, side outer frame 74, and outer mold frame 72 of the mold 7a are bolted 75.
In the formwork 7a, the other wall of the outer cylindrical collar 3 of the T-shaped cross section having the outer diameter substantially equal to the outer diameter of the concrete portion 11 and having the inner wall at the center in the axial direction standing upright at a right angle. A cushioning material 32 is adhered to the concrete portion 11, and an end plate 41 having a width equal to or slightly smaller than the thickness of the concrete portion 11 is provided at right angles to the connection portion 14 via the cushioning material 32, and one or a plurality of end plates 41 are provided on the outer peripheral surface. An inner cylinder 4 having a seal material 33 disposed so as to be able to stop water and having an inner cylinder 4 reduced in diameter from the inner diameter of the outer cylinder collar 3 is provided. One or a predetermined number of joint units 2 each having an outer cylinder 5 made of stainless steel and arranged at a predetermined distance from the other end 3a of the outer cylinder collar 3 are arranged in accordance with the characteristics of the installation location.
Further, the reinforcing bars 6 are disposed between the one wall 34 and the side outer frame 74 of the partition wall 31 and between the end plate 41 and the side outer frame 74, respectively, and then are poured into concrete and manufactured by vibration molding.
Further, a plurality of the joint units 2 may be arranged between the outer frames 74 on both sides.
[0017]
【The invention's effect】
According to the present invention, the following effects can be obtained.
(1) A structure in which the joint unit is unitized by providing a gap in the inner surface on the other side of the outer cylinder collar to reduce the diameter so as to have a predetermined clearance, and disposing an inner cylinder in which a sealing material is disposed on the outer peripheral surface. As a result, a flexible fume tube having sufficient waterproofness, earthquake resistance and bending performance as a joint can be obtained.
Further, since the flexible portion is formed by the joint unit in the flexible fume tube, the joining operation at the construction site is unnecessary. Therefore, the construction period can be shortened, and the working efficiency is improved.
(2) According to the method for manufacturing a centrifugally formed fume tube according to the third and fourth aspects, a flexible fume tube in which a joint unit is arranged at an arbitrary position can be manufactured. Further, since the joint unit forms a part of the mold, it is not necessary to modify the mold in accordance with the position of the flexible portion. Further, the flexible fume tube manufactured according to the present invention can be manufactured inexpensively and efficiently.
(3) The flexible portion (joint unit portion) of the present invention includes an inner cylinder in which the diameter is reduced so as to have a predetermined clearance by a gap on the inner surface on the other side of the outer cylinder collar, and a sealing material is disposed on the outer peripheral surface. Since it is provided with flexibility by being provided as a unit, it is not necessary to protect the flexible portion with a separate member. Accordingly, the present invention can be used for manufacturing all fume pipes from a small diameter to a large diameter without requiring a reinforcing means such as a reinforcing iron plate or a steel band on the inner surface of the pipe.
(4) In the case of curved propulsion, when manufacturing a short tube such as a 1/2, 1/3, or 1/4 tube, the joint unit is placed at a predetermined position in the mold without any modification of the mold. It can be manufactured by arranging a plurality of them. Therefore, the number of divided tubes can be efficiently and economically manufactured with one mold.
(5) In the case of a flexible fume tube manufactured by arranging a plurality of joint units on one fume tube, the fume tube or the propulsion tube can be used very effectively for propelling a sharp curve.
(6) A box culvert joint unit and a method for manufacturing a box culvert using the joint unit also exhibit the same effects as the above (1) １ (5).
[Brief description of the drawings]
FIG. 1 is an illustration of a method for manufacturing a flexible fume tube according to a third embodiment of the present invention.
FIG. 2 is an explanatory view of a method for manufacturing a flexible fume tube according to a fourth embodiment of the present invention in which a plurality of joint units are arranged.
FIG. 3 is a sectional view of the joint unit according to the first embodiment of the present invention.
FIG. 4 is a sectional view taken along line AA.
FIG. 5 is a sectional view of a joint unit according to a second embodiment of the present invention.
FIG. 6 is a sectional view taken along line BB.
FIG. 7 is an explanatory diagram of a method for manufacturing a flexible box culvert according to the present invention.
FIG. 8 is an explanatory partial cross-sectional view of the method for manufacturing a flexible box culvert according to the present invention.
FIG. 9 is an explanatory view of a conventional manhole and a flexible tube.
FIG. 10 is an explanatory view of a conventional manhole and a flexible tube.
FIG. 11 is an explanatory view of a conventional flexible tube.
FIG. 12 is an explanatory view of a conventional flexible tube.
FIG. 13 is an explanatory view of a mold used in manufacturing a conventional short tube.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flexible hue pipe 1a Flexible box culvert 11 Concrete part 12 Embedding collar 14 Connecting part 2 Joint unit 3 Outer cylinder collar 31 Partition 32 Cushion material 33 Seal material 34 One wall 35 Other wall 36 One side end 4 Inner cylinder 41 End plate 42 Other end 5 Outer cylinder 51 Ring 6 Reinforcing cage 7 Insert outer frame 71 Embedded collar side outer frame 72 Outer form 73 Insert form 74 Side form 76 Bottom form 7a Form 8 Long bolt

Claims (7)

An outer diameter substantially equal to the outer diameter of the concrete portion, a cushion material is adhered to the other wall of the partition wall in an outer cylinder collar having a T-shaped cross section in which a partition wall is erected at an inner surface at the center in the axial direction at a right angle, and the cushion material is interposed. An end plate with a width equal to or slightly smaller than the thickness of the concrete part is provided at a right angle to the connection part, and one or more sealing materials are arranged on the outer peripheral surface so that water can be stopped. The diameter of the inner cylinder is arranged, and a steel outer cylinder having an outer diameter substantially equal to the outer cylinder collar is arranged at the other end of the inner cylinder at a predetermined distance from the other end of the outer cylinder collar. Flexible fume tube joint unit. 2. The flexible fume according to claim 1, wherein a hole is provided in the inner cylinder substantially at the center of the sealing material, and an injection cylinder communicating with the hole is provided upright at an inner side of the inner cylinder. Pipe fitting unit. At the one end side and the other end side in the axial direction of the fume tube to be centrifugally formed, an outer frame and an embedded collar-side outer frame are arranged, and an outer formwork is arranged between the outer frame and the embedded collar-side outer frame. In addition, an insertion mold is arranged inside the outer frame of the outlet, and an embedded color is arranged inside the outer frame of the embedded color. Between this outer frame and the outer frame of the embedded color,
An outer diameter substantially equal to the outer diameter of the concrete portion, a cushion material is adhered to the other wall of the partition in an outer cylindrical collar having a T-shaped cross section in which the partition is erected at a right angle on the inner surface at the center in the axial direction, and the cushion material is interposed. An end plate with a width equal to or slightly smaller than the thickness of the concrete part is provided at a right angle to the connection part, and one or more sealing materials are arranged on the outer peripheral surface so as to stop water. A joint unit in which a diameterd inner cylinder is arranged, and a steel outer cylinder having an outer diameter substantially equal to the outer cylinder collar is arranged at the other end of the inner cylinder at a predetermined distance from the other end of the outer cylinder collar. A flexible fume tube characterized in that a reinforcing bar cage is disposed between one of the walls of the partition wall and the outer frame of the opening and between the end plate and the outer frame on the side of the embedded collar, and is manufactured by centrifugal molding. Method. 4. The method for manufacturing a flexible fume tube according to claim 3, wherein a plurality of the joint units are arranged between the insertion mold and the embedded collar side outer frame. The joint unit for a box culvert according to claim 1 or 2, wherein a box culvert is used instead of the fume tube. The bottom outer frame is placed on the bottom, the outer frames on both sides are placed on both ends in the axial direction of the box culvert to be manufactured, and the outer forms are placed on both sides between these two outer frames. To
An outer diameter substantially equal to the outer diameter of the concrete portion, a cushion material is adhered to the other wall of the partition wall of the outer cylindrical collar having a T-shaped cross section in which a partition wall is erected at the inner surface at the center in the axial direction at right angles, and the cushion material is interposed therebetween. An end plate with a width equal to or slightly smaller than the thickness of the concrete part is provided at a right angle to the connection part, and one or more sealing materials are arranged on the outer peripheral surface so as to stop water. A joint unit in which a diameterd inner cylinder is arranged, and a steel outer cylinder having an outer diameter substantially equal to the outer cylinder collar is arranged at the other end of the inner cylinder at a predetermined distance from the other end of the outer cylinder collar. After arranging the reinforcing bars in a predetermined number at predetermined locations corresponding to the characteristics of the installation location, and arranging reinforcing bars between the side outer frame from one wall of the partition wall and between the end plate and the outer frame, concrete is driven and vibration molding is performed. Flexible box cover characterized by being manufactured by Manufacturing method of Bad. The method for manufacturing a flexible box culvert according to claim 6, wherein a plurality of joint units are arranged between both outer frames.

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