JPS6025250B2 - Method of manufacturing hume tubes - Google Patents

Description

[Detailed description of the invention] The invention of this application relates to a method of manufacturing a Hume tube.

Conventionally, when Hume tubes are manufactured using a molding method that utilizes centrifugal force, although this depends on the shape of the formwork, the concrete material has a mirror direction that moves as far away from the center of rotation of the formwork due to the far zero force. On the contrary, there is a cavity on the front side facing backwards. Therefore, as a countermeasure to the cavitation phenomenon, attempts have been made to homogenize the materials of molded products by reducing or not using materials such as sand and gravel, but without aggregate, This has the disadvantage that not only the strength decreases but also the product cost increases. Alternatively, the dimensions for molding in the formwork may be made slightly smaller,
If necessary, mechanical scraping has been performed to ultimately make the dimensions of the socket portion accurate. In addition, a method for finishing the inner surface of the socket part of a concrete pipe, which was invented to ensure smoothness and roundness of the rear part of the metal pipe with a joint part, was invented in Tokugawa Sho 5.
1-14923.

A brief explanation of the technical details is as follows. The inner surface of the socket of a concrete pipe formed by the far-D force forming method is rubbed with a stripping tool such as a wire brush to remove and clean any removable materials such as aggregates on the inner surface of the socket. Adhesive is applied to the area as necessary, and mortar made of cement or inorganic powder with sand and resin adhesive is applied to the adhesive-applied area of the inner surface of the socket.

Next, a socket inner surface forming jig is inserted into the socket portion of the concrete pipe, and the socket inner surface forming jig is rotated at a circumferential speed of 100 m/min or more relative to the concrete pipe. The mortar that has been applied to the inner surface of the socket part of the concrete pipe in the previous step is pressed and bonded to the inner surface of the socket part of the concrete pipe, and the result is a mirror-like surface as if the part had been rotary polished. It will be finished in
Its smoothness can be increased.

Furthermore, extremely accurate roundness can be obtained. This kind of work was not something I wanted to do, but I had no choice but to do it.

When using a completed Hume tube, a large number of tubes are connected to each other to form a long conduit, but in order to connect the ends of the tubes by fitting them together, extremely precise dimensions are required. Height is required. Furthermore, in civil engineering construction, it is necessary to prepare a large number of Hume pipes within a limited construction period, so Hume pipes suitable for mass production are required, and as a result, it is necessary to conduct research and development on the production of Hume pipes with extremely high finishing precision. becomes. The invention of this application is aimed at solving the above-mentioned problem.

Next, a specific configuration for achieving the above purpose will be described. After obtaining a rotational force from a driving source and supplying raw material into the cylindrical form while rotating the cylindrical form, In the first step, a core member movable relative to the cylindrical formwork is temporarily stopped at a position in front of the cylindrical formwork, together with a core support member, and in the second step, the core member is movable relative to the cylindrical formwork. By pushing the core member together with the core support member into the inside of the cylindrical form, the concrete material being formed within the cylindrical form is directly pressed by the core member, and in the third step, , the core member is left together with the cylindrical formwork, the core support member is separated from the core member and the formwork, the core is removed from the formwork before entering the curing process, and in the final stage This is a method of manufacturing a Hume tube by separating a molded product from the mold.

Next, a Hume tube manufacturing device for carrying out the method of manufacturing a Hume tube according to the invention of this application will be described with reference to the attached drawings.
A side plate 3 is brought into contact with the end surface of the end of the form body 1,
Bolts 4 that can be freely engaged and detached from the side plate 3 are placed at appropriate positions on the outer edge of the side plate 3 and have their bases supported on the outer surface of the tire 2 and on the outer peripheral surface of the form body 1.
The side plate 3 is supported by the nut 6 through the washer 5 so as to be freely assembled and disassembled from the form body 1, and the core 7 is inserted so as to close the center opening of the side plate 3. The outer end edge of the core 7 is bent outward to form an outward flange part 8, and the inner end twill part of the core 7 is bent inward to form an inward flange part 9, and the side plate An annular member 10 for the entrance corner made of elastic rubber or elastic synthetic resin is disposed in the corner formed by the inner surface of the side plate 3 and the outer surface of the core 7, and the base of the annular member 10 is connected to the central closing part of the side plate 3. A core holder 12 is disposed inside the core 7 through a cushioning material 11 at a position close to the outer end twill portion of the inner circumferential surface of the core 7. A cylindrical part 1 for preventing overflow is provided inside the inward flange part 9 of the inner end twill part of the core 7.
3, and a cushioning material 15 is placed between the inside of the outward flange part 14 on the outer edge of the cylindrical part 13 and the outside of the inward flange part 9 on the inner edge of the core 7. A tapered part is formed to reduce the diameter of the cylindrical part 13 toward the inner weaving part of the overflow prevention cylindrical part 13, and is located at an intermediate position on the inner circumferential surface of the cylindrical part 13. , and the structure portion 16 is located at a position overlapping with the position of the inward flange portion 9 of the internal edge of the core 7 and extends inwardly in the radial direction about the rotation axis of the form body 1.
3, and its inward protruding structure portion 16
The cylindrical part 13 is connected integrally with the cylindrical part 13 by the cylindrical part receiver 17
A core supporting cylindrical body 20 is disposed inside each member of the core support 12 and the cylindrical part support 17 via two bearings, a bearing 18 and a bearing 19, and the cylindrical body 20 the input amount sensing device 21 from the inner tip of the
The cylindrical body support shaft 22 is moved outwardly from the cylindrical body 20, and the front end of the support shaft 22 is connected to the core advancement/retraction device 23.
The tire 2 is connected to a rotary drive device 24 to apply rotation to the form body 1, and ready-mixed concrete is inputted from an input port 25.

Next, to describe the effects produced by carrying out the invention of this method using the above-mentioned manufacturing apparatus, the formwork body 1
A tire fixed to the outer periphery of the end of the mold receives rotational force from a drive source to rotate the main body of the formwork while supplying rattan. Initially, the core is stopped at the front position, and then the core is rotated for an appropriate amount of time. After this period, the core is pushed into the formwork and straight bale pressing force is applied by the core to areas where the concrete structure is rough, resulting in an extremely homogeneous and highly accurate tube inner surface. There is an effect that can be done.

In addition, after the formwork has been rotated for the required time and the modeling is complete, the curing process begins, but since the core is removed from the formwork before the curing process, the part from which the core was removed also covers the body of the tube. They can enter the external feces in the same way as the internal air, which can improve the curing effect. In particular, the present invention is capable of forming a concrete pipe using a centrifugal force forming method and then hardening it, like the method of finishing the inner surface of a socket on a concrete pipe described in Tokukan Sho 51-14923, which has been practiced in the past. Without applying any new mortar to the inner surface of the closed socket part, the core was inserted in the process before the pipe forming was completed, while the concrete material was still soft and fluid. Since the concrete material is pressed directly into the cylindrical form by pushing the parts into it, it is possible to manufacture products with extremely high precision in terms of dimensions and extremely high homogeneity in terms of strength. It is.

Therefore, since the present invention does not require any work after manufacturing the Hume tube, it is similar to the socket inner surface finishing method for concrete tubes described in Hakama Sekisho 51-14 Group No. 3. By rubbing the inner surface of the socket with a stripping tool such as a wire brush, it becomes unnecessary to remove aggregates, etc., and it is also possible to apply new mortar to the inner surface of the socket of the concrete pipe. This also eliminates the need for additional work.

Furthermore, there is no process of inserting the socket inner surface forming paint into the socket part of the concrete pipe and rotating the socket inner surface forming tool relative to the concrete pipe at a circumferential speed of 100 m/min or more. It is unnecessary, and in any case, there is no need to carry out various steps after the concrete pipe has been centrifugally formed, as in the method for finishing the inner surface of a socket on a concrete pipe described in JP-A-51-14923. effective.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing the main parts of a manufacturing apparatus for carrying out the present invention, FIG. 2 is a view taken along arrows A-A' in FIG. 1, and FIG. FIG. 4 is a schematic diagram showing the first step in carrying out the invention using the apparatus shown in FIG. 1, and FIG. 4 is a diagram showing the transition from the first step to the second step shown in FIG. FIG. 5 is a schematic diagram when moving from the second stage shown in FIG. 4 to the third stage, and FIG. 6 is a schematic diagram when the core is removed. Explanation of symbols: 1... Form body, 2... Tire, 3... Side plate, 4... Bolt, 5...
...Washer, 6...Nut, 7...Core, 8...Outward flange, 9...Inward flange, 10...・Annular member, 11...
... Cushion material, 12 ... Core holder, 13.
...Cylindrical part for overflow prevention, 14...Outward flange part, 15...Cushion material, 16...
...Protrusion structure part, 17...Cylindrical part receiver, 18,1
9... Bearing, 20... Cylindrical body for core support, 21... Input amount sensing pupil, 22... Cylindrical body support shaft, 23... ... core forward backward bag direct, 24
... Rotation drive device, 25 ... Input port. Figure 8, Station fin 2 Figure Purple 3 Figure 4 Figure 6

Claims (1)

[Claims] 1. After obtaining rotational force from a driving source and supplying raw materials into the cylindrical form while also rotating the cylindrical form, a core member that is movable relative to the cylindrical form is placed. In the first step, the core member and the core support member are temporarily stopped at a position in front of the cylindrical form, and in the second step, the core member and the core support member are placed inside the cylindrical form. By pushing, the concrete member being formed within the cylindrical form is directly pressed by the core member, and in the third step, the core member is left together with the cylindrical form and a core support member is A method of manufacturing a hume pipe by separating the core member from the mold and the mold, removing the core from the mold before entering a curing process, and separating the molded product from the mold in the final stage.