JPH018352Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an unevenness forming device for synthetic resin-coated steel pipes.

[Background Art] For synthetic resin-coated steel pipes that are laid, for example, on the seabed, the outer surface of the synthetic resin coating layer is wrapped with weight coating or concrete for surface protection. However, since the outer surface of the synthetic resin-coated steel pipe is relatively hard and smooth, the adhesion strength of concrete to the outer surface of the synthetic resin-coated steel pipe is low, and the axial direction of the synthetic resin-coated steel pipe There is a risk that the concrete will separate and fall off from the outer surface of the synthetic resin coating layer due to the applied external force.

Therefore, in Japanese Patent Application No. 57-40258, the applicant proposed a synthetic resin-coated steel pipe 1 as shown in FIG.
The outer circumferential surface of the synthetic resin-coated steel pipe 1 is pressed by a pressurizing means 3 using a mold 2 having a pressing surface with an uneven surface and a built-in heater on a surface having approximately the same curvature as the outer circumferential surface of the tube. An unevenness forming apparatus has already been proposed which can form unevenness on the synthetic resin coating layer of the synthetic resin coated steel pipe 1 by pressing the steel pipe 1. By the way, when using this unevenness forming device, the thickness of the synthetic resin coating layer is very thin at 2 mm to 4 mm, so in order to obtain a uniform uneven shape, the mold 2 must be placed evenly on the outer peripheral surface of the synthetic resin coating layer. It is necessary to press.

However, in the unevenness forming apparatus proposed in Japanese Patent Application No. 57-40258, the mold 2 is integrally connected to the tip of the pressure means 3 either directly or through a connecting member. Therefore, when using this unevenness forming device, if the synthetic resin-coated steel pipe 1 has no warp or bend, the pressing direction of each mold 2 passes through the axial center 1A of the synthetic resin-coated steel pipe 1, and the mold 2 Although pressure is applied evenly to the outer peripheral surface of the synthetic resin coating layer, if the synthetic resin coated steel pipe 1 has warpage or bending, the pressing direction of the mold 2 may be applied to the axial center 1A of the synthetic resin coated steel pipe 1. Without passing through, the mold 2 is not evenly pressurized on the outer peripheral surface of the synthetic resin coating layer, and an uneven surface may be formed on the outer peripheral surface of the synthetic resin coating layer, or only one side of the mold 2 may It bites too deeply into the resin coating layer, causing local coating damage or excessively thin parts of the synthetic resin coating layer.

Therefore, in Japanese Patent Application No. 57-120818, the present applicant improved the above-mentioned unevenness forming device and created a new unevenness forming device in which a mold is swingably connected to the tip of the pressurizing means. is suggesting. According to this new unevenness forming device, when one side of the mold is locally pressed against the synthetic resin coating layer of a steel pipe with warpage or bends, the mold swings relative to the pressing means. After that,
The entire pressing surface of the mold can uniformly press the synthetic resin coating layer of the steel pipe, making it possible to prevent the formation of an uneven surface to a considerable extent.

However, in the unevenness forming device proposed in the above-mentioned Japanese Patent Application No. 57-120818, one side of the mold that is locally pressed against the synthetic resin coating layer of the warped or bent steel pipe is heated. Due to this condition, the synthetic resin coating layer pressed by one side of the mold locally melts and solidifies, thereby preventing the formation of local recesses.

[Purpose of the invention] The present invention applies pressure evenly to the synthetic resin coating layer using the pressing surface of the mold, even if the synthetic resin coated steel pipe has warpage or bends, and improves the unevenness formation area of the synthetic resin coating layer. The purpose is to form uniform unevenness over the entire surface.

[Structure of the invention] In order to achieve the above object, the present invention has a pressing surface with an uneven portion formed on a surface having approximately the same curvature as the outer circumferential surface of a synthetic resin-coated steel pipe, and a built-in heater. In an unevenness forming device for a synthetic resin-coated steel pipe, which presses a mold against the outer circumferential surface of the synthetic resin-coated steel pipe using a pressure means to form an uneven portion on the synthetic resin coating layer of the synthetic resin-coated steel pipe, A mold is swingably connected to the tip of the pressurizing means, and a water-cooled stopper portion is provided near the peripheral edge of the pressing surface of the mold.

[Specific explanation of the invention] Figure 2 is a front view showing an embodiment of the invention, and Figure 3 is a front view showing an embodiment of the invention.
This figure is a side view of FIG. 2, and FIG. 4 is a front view showing the main parts of FIG. 2.

As shown in FIGS. 2 and 3, main frames 13 are arranged in parallel at the front and rear of each of the left and right lower frames 12 constituting the pedestal 11, tilting upward and inward. is fixed to the upper frame 14. At four positions in the front-rear direction on the upper surface of each of the left and right lower frames 12 of the gantry 11, cylinder mounting tables 15 each having a cylinder mounting surface 15A that slopes outward and downward are arranged in parallel. 4 cylinder mounting tables 15 on each side on the left and right, and upper frame 1
Air cylinder devices 16 as pressurizing means are installed at each of four positions in the front and rear direction of the vehicle. Piston rod 1 of each air cylinder device 16
One end of a connecting member 18 supported by each cylinder mounting table 15 or upper frame 14 by a supporter 17 is coupled to the tip of the connecting member 6A with a pin, and the other end of the connecting member 18 is connected with a pin. Universal joint 1
A mold 20 is swingably connected via 9.

That is, 4 in the longitudinal direction of the synthetic resin coated steel pipe 1
At each position, molds 20 supported by respective air cylinder devices 16 are arranged at three equally spaced positions around the steel pipe 1. Each mold 20 has an arc length that roughly divides the outer circumferential length of the steel pipe 1 into thirds,
It is possible to advance and retreat simultaneously in the radial direction of the steel pipe 1 from three positions around the steel pipe 1 and press the steel pipe 1 at the same time. Note that the axis of the piston rod 16A of each air cylinder device 16 is set in a direction passing through the axial center portion 1A of the steel pipe 1.

FIG. 5 is a partially cutaway perspective view of the steel pipe 1 and the mold 20, FIG. 6 is a partially cutaway side view of the steel pipe 1 and the mold 20, and FIG. 7 is a partially cutaway side view of the steel pipe 1 and the mold 20. The front view shown in FIG. 8 is a side view of FIG. 7.

The mold 20 is made of, for example, aluminum or cast iron, and the pressing surface 21 has approximately the same curvature as the outer circumferential surface of the steel pipe 1, and is provided with uneven portions, such as a large number of circular recesses 22. Moreover, the mold 20 has a built-in heater 23, and presses the pressing surface 21 against the synthetic resin coating layer 1B of the steel pipe 1 in a state heated to 200°C to 300°C, and presses the pressing surface 21 onto the outer peripheral surface of the synthetic resin coating layer 1B. The uneven portion 1C can be easily formed.

The mold 20 has two positions on each side of the pressing surface 21,
That is, stopper portions 24 are provided near the four corners of the pressing surface 21. The mold 20 has a cooling water channel 25 for cooling the stopper part 24. That is, the mold 20 cools only the stopper part 24 with water by supplying circulating water to the cooling channel 25 opened on the side, and cools the stopper part 24 to a temperature exceeding the melting and softening point of the synthetic resin coating layer 1B of 100°C. It is possible to maintain water cooling within a certain range.

Further, in the mold 20, the surface of the stopper portion 24 is set lower than the pressing surface 21 by, for example, 1 mm to 2 mm. Thereby, the stopper portion 24 does not come into contact with the synthetic resin coating layer 1B of the steel pipe 1, which is free from warpage and bending, and does not damage the surface of the synthetic resin coating layer 1B. Further, the stopper portion 24 can suppress excessive digging into the synthetic resin coating layer 1B by the full depth of the recess 22. For example, the stopper portion 24
If the surface of 4 is set 1.5 mm lower than the pressing surface 21, when the total depth of the recess 22 is 2 mm, the digging depth into the synthetic resin coating layer 1B will be 1.5 mm.
It is possible to suppress it to a certain extent.

FIG. 9 is a front view showing how the steel pipe 1 is supported on the truck, and FIG. 10 is a side view of FIG. 9.

The steel pipe 1 is placed on a trolley 27 with its both ends supported by support arms 26. The trolley 27 is movable on rails 28 extending back and forth from the inside of the pedestal 11 by the operation of a drive motor 29. 30 is a wheel; 3
1 is a cable reel capable of winding and storing hydraulic cables, power transmission lines, etc. Reference numeral 32 denotes steel pipe supporting auxiliary members provided on the upper surface of the truck 27 at appropriate intervals. 33 is a trolley 2 according to the length of the steel pipe 1.
This is a truck connecting member for adjusting the length of the vehicle.

An air cylinder device 34 is installed at the bottom of the upper frame 14, and a support fitting 37 that can support the steel pipe 1 is provided at the tip of the piston rod 35 of the air cylinder device 34 via a connecting member 36.
is installed. Further, a phototube 39 is attached to the lower frame 12 of the pedestal 11 via a phototube support member 38. The phototube 39 is a steel pipe 1
In addition to detecting the tip position of the cart 27 on which the steel pipe 1 is placed, each position in the longitudinal direction of the steel pipe 1 can also be detected.

Next, the operation of the above embodiment will be explained.

If the steel pipe 1 has no warpage or bending, the entire surface of the pressing surface 21 of each mold 20, which is advanced by the operation of each air cylinder device 16, will evenly press the surface of the synthetic resin coating layer 1B, and the synthetic resin It is possible to easily form uniform unevenness over the entire surface of the unevenness formation region of the covering layer 1B.

On the other hand, if the steel pipe 1 is warped or bent,
The pressing direction of the mold 20 does not pass through the axial center portion 1A of the steel pipe 1, so that the pressing surface 21 of the mold 20
As shown in FIG. 12 and FIG. 12, the synthetic resin coating layer 1B of the steel pipe 1 is not arranged parallel to the surface of the synthetic resin coating layer 1B, and as each air cylinder device 1 moves forward, one of the stopper portions 24 of the mold 20 is disposed parallel to the surface of the synthetic resin coating layer 1B. Contact with 1B. Here, since the stopper part 24 is water-cooled as described above, the synthetic resin coating layer 1B that the stopper part 24 comes into contact with is not melted, and the mold 20 is in contact with the stopper part 24 and the synthetic resin coating layer 1B. It rotates using the contact portion as a fulcrum and changes its position so that the entire surface of the pressing surface 21 contacts the surface of the synthetic resin coating layer 1B. Therefore, even if the steel pipe 1 has warpage or bends, the surface of the synthetic resin coating layer 1B can be molded with the mold 20.
It is possible to apply pressure evenly by the pressing surface 21 of the holder and easily obtain a uniform uneven portion.

According to the concrete implementation results of this invention, the first
As shown in Figures 1 and 12, even with steel pipes that have a 11 mm lateral shift or 40 mm vertical shift, there is no over-cutting or excessive thinning, and the stopper part of the mold prevents biting. The effect was confirmed. However, the total length of the steel pipe was 12 mm. Furthermore, in FIGS. 11 and 12, the outer circumferential position of the steel pipe without deviation is indicated by a chain double-dashed line.

[Effects of the invention] As described above, the invention provides a mold having a pressing surface with an uneven portion formed on a surface having approximately the same curvature as the outer circumferential surface of a synthetic resin-coated steel pipe and a built-in heater. , in an unevenness forming apparatus for a synthetic resin-coated steel pipe, which presses the outer circumferential surface of the synthetic resin-coated steel pipe with a pressure means to form an uneven portion in the synthetic resin coating layer of the synthetic resin-coated steel pipe, the pressure means A mold is swingably connected to the tip of the mold, and a water-cooled stopper portion is provided near the periphery of the pressing surface of the mold. Therefore, even if the synthetic resin-coated steel pipe has warpage or bends, the pressing surface of the mold can evenly press the synthetic resin coating layer, creating uniform unevenness over the entire surface of the unevenness forming area of the synthetic resin coating layer. It becomes possible to form.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a conventional example, Fig. 2 is a front view showing an embodiment of the present invention, Fig. 3 is a side view of Fig. 2, and Fig. 4 shows the main parts of Fig. 2. 5 is a partially cutaway perspective view of the steel pipe and the mold, FIG. 6 is a partially cutaway side view of the steel pipe and the mold, and FIG. 7 is the mold. Front view, Figure 8 is a side view of Figure 7, Figure 9 is a front view showing the supported state of the steel pipe, Figure 10 is a side view of Figure 9, and Figure 11 is the steel pipe in a sideways displacement state with the mold. Front view showing 12th
The figure is a side view showing a steel pipe that is vertically displaced from the mold. 1...Steel pipe, 1B...Synthetic resin coating layer, 1C...
...Uneven portion, 16... Air cylinder device, 19...
Universal joint, 20... Mold, 21... Pressing surface, 22
... recess, 23 ... heater, 24 ... stopper section, 25 ... cooling water channel.

Claims (1)

[Scope of utility model registration request] The outer periphery of the synthetic resin-coated steel pipe is pressed by a pressurizing means into a mold having a pressing surface with an uneven portion formed on a surface having approximately the same curvature as the outer periphery of the synthetic resin-coated steel pipe and containing a built-in heater. In an unevenness forming device for a synthetic resin-coated steel pipe that can press against a surface to form unevenness in the synthetic resin coating layer of the synthetic resin-coated steel pipe, a mold is swingably connected to the tip of the pressing means, An unevenness forming device for a synthetic resin-coated steel pipe, characterized in that a water-cooled stopper portion is provided near the periphery of a pressing surface of a mold.