JP3679361B2 - Propulsion pipe unit manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a steel tube reinforced centrifugal force formed concrete propulsion tube unit, and more particularly to a method for manufacturing a long and short tube suitable for sharp curve propulsion.
[0002]
[Prior art]
In the construction of the current propulsion method, especially for sharp curve propulsion, the steel pipe with a short pipe length of 400 mm is used for the main part of the concrete pipe from the viewpoint of ensuring water-stopping of joints and preventing pipe damage. Reinforced centrifugally formed concrete propulsion pipes are in use. One or a plurality of such propulsion pipes are simultaneously molded in a conventional centrifugal force molding machine by a single cylindrical mold, and are individually conveyed to the construction site after demolding and curing. At the construction site, each propulsion pipe is individually suspended in a vertical shaft for propulsion work, and propulsion is carried out by sequentially fitting each tail pipe to the tail of the preceding propulsion pipe. In addition, in order to improve work efficiency, a plurality of propulsion pipes, for example, three propulsion pipe outlets and receptacles are fitted to each other at the work site to form a unit, and the unit is suspended as it is in the shaft. There is a case in which propulsion is carried out by fitting the unit at the tail of the propulsion pipe.
[0003]
In a factory for manufacturing a propulsion pipe as described above, one reinforcing steel pipe is set in one conventional mold for forming centrifugal force, or a plurality of reinforcing steel pipes are divided by spacers. After individually setting and forming, removing the mold, curing, care, painting, transportation, etc. are handled as individual propulsion pipes. It is also transported by individual handling during shipment.
[0004]
[Problems to be solved by the invention]
As mentioned above, manufacturing short-sized propulsion pipes individually or handling them individually is not only bad in work efficiency, but also when unitizing work at manufacturing factories and construction sites It is necessary to secure equipment for unitization, installation yard, and workers. In addition, because the pipe length is short, there is a risk of tipping over at a slight inclination, which requires careful work, so it takes time for unitization, hindering the work efficiency of the entire propulsion work, There was a problem that caused high costs.
[0005]
Accordingly, an object of the present invention is to facilitate handling, improve manufacturing efficiency, and increase the efficiency of propulsion work by unitizing a propulsion pipe having a short pipe length from the production stage.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is arranged in the longitudinal direction of a plurality of reinforcing steel tube type centrifugal force formed concrete propulsion pipes provided with an insertion port at one end and a receiving port at the other end. In a manufacturing method of a propulsion pipe unit in which a slot and a receptacle of a propulsion pipe are fitted to each other, a molding mold is formed in a state in which a plurality of reinforcing steel pipes and a receptacle are fitted in advance and a gap piece is interposed in the fitting portion. After setting inside, perform centrifugal force molding, remove the spacing piece after demolding and curing, and then insert a cushioning material in the spacing section and attach a connecting bar between each propulsion pipe It is designed to be integrated.
[0007]
If the work to interpose the cushioning material is hindered by the presence of the connecting bar, install the connecting bar after the work to interpose the cushioning material first, but if there is no such trouble, It is safe to perform the above work first.
[0008]
Note that the cushion material may be interposed only at two opposing positions in the position corresponding to the curve direction such as the horizontal direction or the vertical direction.
[0009]
Since the propulsion pipe unit manufactured as described above is connected and integrated by setting a connecting bar after demolding and curing, there is the convenience that it can be always handled as an integrated unit until construction. The risk of falling when handling the propulsion pipe is also eliminated. Moreover, when the above-mentioned connecting bar is removed at the construction site and propulsion is performed, a cushion material is interposed in the space between each propulsion pipe, so that a margin to bend between the propulsion pipes is secured at the curve portion. Concentrated load due to point touch between the propulsion pipes can be avoided.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The propulsion pipe unit shown in FIG. 1 and FIG. 2 is a unit in which three propulsion pipes 1 having a short pipe length are combined and integrated. Each individual propulsion pipe 1 is composed of a reinforced steel pipe 2 and a pipe body 3 formed of a concrete layer formed by centrifugal force molding on the inner peripheral surface thereof. The reinforcing steel pipe 2 is formed by joining and integrating a receiving steel pipe 5 to the rear end of the inserting steel pipe 4 by welding, and forming an annular inserting end plate 6 at the distal end of the inserting steel pipe 4 and an annular on the inner peripheral surface of the receiving steel pipe 5. The receiving end plates 7 are joined by welding. The concrete layer forming the pipe body 3 is provided between the end plates 6 and 7. The length of the tube body 3 is, for example, 400 mm with respect to the tube diameter of 800 to 3000 mm, and unitization becomes more effective as the tube diameter increases.
[0011]
The inlet steel pipe 4 has a diameter smaller than that of the receiving steel pipe 5 at an oblique step portion 8 provided at a joint portion with the receiving steel pipe 5. By forming three ridges 9 on the outer peripheral surface of the spout steel pipe 4 between the stepped portion 8 and the tip, two circumferential grooves 11 are formed between the three ridges 9. ing. A rubber ring 12 as a seal member is attached to each circumferential groove 11. The insertion steel pipe 4 and the insertion end plate 8 from the stepped portion 8 to the tip, and the portion of the tube main body 3 covered by these are referred to as an insertion port 13. A portion of the receiving steel pipe 5 protruding rearward from the receiving end plate 7 is referred to as a receiving port 14. Screw pipes 15 are insert-molded at two opposing positions on the inner peripheral surface of the pipe body 3.
[0012]
The reason why the inner diameters of the insertion end plate 6 and the receiving end plate 7 are formed to be slightly larger than the inner diameter of the tube body 3 as shown in FIG. 2 will be described later.
[0013]
The above-described propulsion pipe unit has the above three propulsion pipes 1 arranged with the inlets 13 facing forward, and the outlets of the rear propulsion pipes 1 are respectively inserted into the receiving openings 14 of the front propulsion pipes 1. 13, each rubber ring 12 is brought into close contact with the inner surface of the receiving port 14 by the fitting. Further, the relative positions in the circumferential direction of the propulsion tubes 1 are determined so that the positions of the screw tubes 15 are aligned on a straight line in the length direction.
[0014]
Further, a fixed interval S is formed between the insertion port 13 and the receiving port 14 at two fitting portions, and two connecting bars having a length extending over the three propulsion pipes 1 are maintained to maintain this interval S. 16 is stopped by a bolt 15 'that is screwed into a screw tube 15 provided at the opposing position (see FIG. 3). As will be described later, the connecting bar 16 is attached after the propulsion pipe unit is manufactured and is removed immediately before propulsion, but the interval S at the time of manufacture is maintained as it is until then. An arc plate-like cushion material 17 made of foamed plastic or the like is interposed in two portions facing each other (see FIG. 3), and adhered to the receiving end plate 7. The interval S is formed larger than the thickness of the cushion material 17, but this is for the convenience of attaching the cushion material 17. A similar cushion material 17 is also adhered to the rear end end plate 7 at the same position.
[0015]
In the illustrated case, the cushion member 17 is attached at two locations in the upper and lower directions in the propulsion direction. This is a structure that is employed when the tunnel is curved in the horizontal direction. When it is curved in the vertical direction, it is interposed at two places on the left and right. In any case, even when the spacing between the propelling pipes 1 is deformed into a V shape within the curved portion and the thickness of the cushion material 17 is compressed and deformed into a wedge shape (see FIG. 4), the presence of the cushion material 17 exists. Thus, the point touch between the propulsion pipes 1 on the narrow gap side is prevented.
[0016]
The propulsion pipe unit of the embodiment is as described above, and the manufacturing method thereof will be described next. FIG. 5 shows a state in which three reinforcing steel pipes 2 are fitted via the spacing piece 18. Each reinforced steel pipe 2 is constituted by an inlet steel pipe 4, an outlet steel pipe 5, an inlet end plate 6 and an outlet end plate 7, and rubber rings 12 are provided in two circumferential grooves 11 formed on the outer peripheral surface of the inlet steel pipe 4. The structure to be mounted and the structure in which these are fitted with an interval S are as described above with reference to FIG.
[0017]
The interval piece 18 is interposed over the entire circumference of the portion of the interval S described above. As shown in FIG. 6, the spacing piece 18 includes an anchor 19 that is fixed in large numbers over the entire circumference and a large number of cover plates 20 that are attached to the anchor 19. As shown in FIG. 7, the anchor 19 is a metal member having a U shape, and is interposed between the gap S between the insertion end plate 6 and the receiving end plate 7. The bolt 21 and the nut 21 'are screwed at a position deeper than the inner peripheral edge. Each cover plate 20 is fitted to the opening surface of the above-described interval S to close the opening, and the cover plate 20 is closed over the entire circumference by overlapping the inclined end surfaces. On the outer surface of each cover plate 20, there is provided a positioning plate 22 that fits within the space S, thereby preventing the cover plate 20 from shifting. Each cover plate 20 is fixed to three anchors 19 by bolts 23 per sheet (see FIGS. 6 and 8).
[0018]
The unit of the three reinforcing steel pipes 2 with the spacing piece 18 interposed therebetween is manufactured in advance, and this is mounted on a conventionally used cylindrical mold 24 for centrifugal force forming (see FIG. 5). Perform molding. The thickness b (see FIG. 9A) of the concrete layer that becomes the tube body 3 is a thickness that reaches the inner surface of the cover plate 20. Part of the fixing jigs 25 and 26 is applied to the inner peripheral surfaces of the insertion end plate 6 and the receiving end plate 7 at both ends, and a non-laminated portion (joint) of concrete is formed by the dimension a. Is done. The part of the dimension a is set equal to the thickness of the cover plate 20 (see FIG. 9A). The fixing jigs 25 and 26 are fixed to the mold 24 with bolts.
[0019]
FIG. 10 shows a state in which the tube body 3 is formed by the concrete layer after the molding is completed. After demolding and curing, the spacing piece 18 is removed, and molding burr and the like are removed for finishing. Thereafter, the connecting bar 16 is screwed and fixed to the two portions of the threaded pipe 15 at the opposite positions with bolts 15 ′, and the interval S is maintained. After or before that, the cushion material 17 is attached to the portion of the interval S to finish the state of the propulsion pipe unit in FIG.
[0020]
As described above, the propulsion pipe unit is conveyed to the propulsion construction site while being connected by the two connecting bars 16. After being suspended in the propulsion pit as it is and fitted as a unit to the rear end of the preceding propulsion pipe, the connecting bar 16 is removed and propulsion is started.
[0021]
When receiving the propulsive force, the portion of the interval S is shortened and the propulsive force is transmitted through the cushion material 17. The deformation of the cushion material 17 in the curved portion is as described based on FIG.
[0022]
In addition, the space | interval part and joint including the cushioning material 17 are obstruct | occluded by filling with mortar etc. after completion of construction of a propulsion.
[0023]
【The invention's effect】
As described above, the present invention is manufactured by unitizing a plurality of propulsion pipes with short pipe lengths suitable for sharp curve propulsion, and transporting each propulsion pipe to the construction site while being connected by a connecting bar. Since the connection bar is removed for the first time, there is no need to work as a unit at the construction site, and the propulsion pipe can be easily handled inside and outside the factory. Furthermore, when loading the product as a truck, packing with a short length of propulsion pipe is difficult, but because it is a unit, it can be packed safely and transported safely.
[0024]
In addition, a plurality of reinforcing steel pipes are attached to the formwork in a state where they are joined together with an interval piece interposed therebetween. For this reason, after the molding, the propulsion pipe unit can be obtained by simply removing the spacing piece, so that the manufacturing efficiency is high and the safety is ensured.
[Brief description of the drawings]
1 is a cross-sectional view of a propulsion pipe unit. FIG. 2 is a cross-sectional view of a propulsion pipe. FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 6 is a sectional view taken along line BB in FIG. 5. FIG. 7 is an exploded perspective view of the spacing piece portion. FIG. 8 is a perspective view of the assembled state of the portion in FIG. a) Enlarged sectional view of the spacing piece part (b) Sectional view taken along line bb in FIG.
Cross-sectional view of the completed state
DESCRIPTION OF SYMBOLS 1 Propulsion pipe 2 Reinforcement steel pipe 3 Pipe body 4 Insertion steel pipe 5 Receptacle steel pipe 6 Receptacle end plate 7 Receptacle end plate 8 Stepped part 9 Projection 11 Circumferential groove 12 Rubber ring 13 Insertion 14 Receptacle 15 Screw pipe 15 'Bolt 16 Connection Bar 17 Cushion material 18 Spacing piece 19 Anchor 20 Cover plate 21 Bolt 21 'Nut 22 Positioning plate 23 Bolt 24 Molding mold 25 Fixing jig 26 Fixing jig

Claims (3)

A plurality of steel tube reinforced centrifugal force-formed concrete propulsion pipes 1 provided with an insertion port 13 at one end and a receiving port 14 at the other end are arranged in the length direction, and the insertion port 13 and the receiving port 14 of each propulsion tube 1 are arranged. In the method of manufacturing the propulsion pipe unit in which the fitting pipes are mutually fitted, the insertion holes 13 and the receiving openings 14 of the plurality of reinforcing steel pipes 2 are fitted in advance, and the end plates 6 of the insertion openings 13 and the end plates of the receiving openings 14 at the fitting portions. 7, the interval piece 18 is interposed and fixed to the opening surface of the interval S formed between the 7 , and the entire circumference of the opening is closed, and the inner surface of the interval piece 18 is made to coincide with the inner peripheral surface of the formed propelling pipe 1. state centrifuge force molded after being set to the molding frame in a was, to remove the demolded-curing after the interval piece 18, then between the propulsion tube 1 cross with interposed a cushion member 17 to a portion of the distance S Attaching the connecting bar 16 to each other A method for manufacturing a propulsion pipe unit, characterized in that it is integrally coupled to the propulsion pipe unit. 2. The method of manufacturing a propulsion pipe unit according to claim 1, wherein each of the propulsion pipes 1 is formed in a length suitable for curve propulsion. Method for producing a propulsion tube unit according to claim 1 or 2, characterized in that interposed opposing two locations of spacing S between propulsion tube 1 cross the cushion member 17.

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