JP4832072B2 - Steel pipe tower interior rust prevention method - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a steel pipe tower internal rust prevention method, and in particular, a steel pipe tower internal rust prevention suitable for preventing corrosion inside a steel pipe of a hollow steel pipe steel tower such as an overhead power transmission line steel tower having a main column made of steel pipe. Regarding the method.

In recent years, many cases of trouble caused by internal corrosion of steel pipes have been reported nationwide in aged towers for overhead power transmission lines. The major causes of these troubles are as follows.
(1) Condensation in the pipeline due to the difference between the outside air and the internal temperature (2) Continuation of the internal wet state due to raindrop infiltration, etc. (3) Local rusting due to invasion / nesting of small insects (4) During the internal plating process village

As a current countermeasure method, painting (including internal coating) inside a steel pipe and replacement of the corresponding steel pipe member are generally performed.
Moreover, although the main purpose is to save steel materials, from the viewpoint of the filler construction method, some MC steel towers are used to fill the steel pipes with concrete.
Furthermore, as a prior art from the viewpoint of labor saving, the following Patent Document 1 discloses a rust preventive device inside a main pillar material of a steel pipe tower attached to the top position of a steel tower, including a blower, a dehumidifier, a pipe, a hose, and the like. In order to continuously supply electric power to a blower and a dehumidifier, a main pillar material internal rust prevention device including a solar battery, a wind power generator, and a storage battery is disclosed. In this main column material internal rust prevention device, dry gas is continuously sent from the end of the steel tower in the main column material of the steel pipe tower, and the dry gas passing through the inside of the steel pipe is provided at the bottom of the steel pipe tower main column material. The inside of the steel pipe is dried by being exhausted from the drainage groove of the plate.
JP 2002-242332 A

However, painting the inside of the steel pipe and replacing the steel pipe member are not fundamental solutions and have a problem of high cost.
In addition, when trying to change to the MC tower, there was a problem that not only the stability of the foundation was lost due to the load increase due to concrete filling, but also a huge cost had to be prepared.
Furthermore, the main columnar material internal rust prevention device disclosed in the above-mentioned Patent Document 1 tries to evaporate and dry the inside of the steel pipe in a wet state by the generated electric power of sunlight or wind power generation equipment. Although it is a technology, there is a problem that the maintenance cost of the power generation equipment is large, and power generation cannot be performed in wet or cloudy weather.

  An object of the present invention is to provide a method for preventing rust inside a steel pipe tower that has good foundation stability and can reduce costs.

Steel tower internal anticorrosive method of the present invention is a steel pipe steel tower internal anticorrosive method used to prevent corrosion of the steel pipe inside the hollow steel towers already set, towers steel tube (1 constituting the hollow steel tube tower The extruder is gradually pulled up while extruding the synthetic resin by the extruder (10) inserted in the internal space of the steel tower, and the internal space of the steel tower pipe is made of the synthetic resin extruded from the bottom to the top of the steel tower steel pipe. and wherein the filling.
Here, the extruder includes a barrel (11) having a die (12) attached to a front end portion thereof, and guide rollers (13 _{1 to} 13 ₈ ) attached to outer surfaces of a front end portion and a rear end portion of the barrel. A motor (14) provided in the rear end side of the barrel, an extrusion screw (15) provided in the barrel and rotated by the motor, the extrusion screw and the die of the barrel There may be provided a heater (16) provided on the inner surface of the portion to which is attached, and a camera (17) attached to the outer surface of the tip of the barrel.
The extruder is attached to the tip of a cable (20). A pilot rope (21) is passed through the center of the cable, and a power cable (22), a raw material introduction pipe (23), A blowing agent introduction pipe (24) and a monitor cable (25) may be passed through the pilot rope.
One end of the pilot rope is fixed to the rear end of the barrel of the extruder, and the extruder is pulled up and down by winding and unwinding the cable using a winch (41). And a generator (43) connected to the motor and the heater for heating after the front end of the power cable is inserted into the barrel from the rear end of the barrel, and connected to the end of the power cable. Power is supplied to the motor and the heater for heating from the power cable, and the raw material introduction pipe and the foaming agent introduction pipe are inserted into the barrel from the rear end of the barrel, Ends of the raw material introduction pipe and the foaming agent introduction pipe are connected to a material supply machine (42), and the raw material introduction pipe and the foaming agent introduction pipe are connected from the material supply machine. The raw material and the foaming agent are respectively supplied to the inside of the barrel, the tip of the monitor cable is connected to the camera, and the end of the monitor cable is connected to the monitor (44), and the monitor cable is connected to the monitor via the monitor cable. In addition, power may be supplied from the camera to the camera and image data may be transmitted from the camera to the monitor.
Filling the inner space of the plated steel pipe member (63) with synthetic resin, scraping off the filled synthetic resin at the center of the steel pipe member, leaving the synthetic resin only on the inner wall surface of the steel pipe member May be a feature.
The synthetic resin may be selected from a thermoplastic resin including a general-purpose plastic, a general-purpose engineering plastic, and a super engineering plastic, and a thermosetting resin by comprehensively evaluating lightness, leakage, and characteristic stability.
The synthetic resin may be a polystyrene foam.

The steel pipe tower internal rust prevention method of the present invention has the following effects.
(1) Filling the internal space of the steel tower pipes that make up the hollow steel pipe tower with a synthetic resin selected based on a comprehensive evaluation of lightness, leakage, and characteristic stability, it is possible to reduce the In addition to eliminating the need for reinforcement measures, the stability of the characteristics of the synthetic resin is extremely advantageous in terms of total cost.
(2) Since the synthetic resin used as a filler is freely moldable and lightweight, it can also be used as a corrosion countermeasure filler such as a PM column.
(3) Since some synthetic resins can be reconstituted, they can be expected as fillers for preventing deterioration and damage of underground underground conduits.
(4) By further downsizing and improving the synthetic resin extruder, it is also possible to fill the internal space such as the belly of a hollow steel pipe tower with synthetic resin. Also contributes.
(5) For new steel towers, filling steel pipe members with synthetic resin at the manufacturing stage of the manufacturer can achieve high-quality filling compared to on-site construction, and match the synthetic resin used as the filler to the purpose. This makes it possible to drill holes for further weight reduction.

The objectives of good foundation stability and low cost were realized by filling a steel pipe or steel pipe member constituting a hollow steel pipe tower with a synthetic resin such as foamed polystyrene.
That is, the steel pipe tower internal rust prevention method of the present invention removes condensation, raindrop infiltration, and small insect invasion by removing the steel tower steel pipe or the internal space itself of the steel pipe member constituting the hollow steel pipe tower as in the conventional MC tower. The basic idea is to prevent it, but from the standpoint of stability of the foundation and cost reduction, the viewpoint of the foundation is completely different from concrete, and foam polystyrene is mainly used as a filler that satisfies all the following requirements. It is characterized by adopting synthetic resin.
(1) Light weight (2) Inexpensive (3) No leakage (4) No change in characteristics (5) Able to handle various steel pipe sizes (6) Easy on-site construction ( 7) Be safe

Hereinafter, the Example of the steel pipe tower internal rust prevention method of this invention is described with reference to drawings.
The steel pipe tower internal rust prevention method according to the first embodiment of the present invention prevents corrosion inside the steel pipe of the hollow steel pipe tower by filling the internal space of the steel tower steel pipe constituting the existing hollow steel pipe tower with synthetic resin. It is.
In addition, in this specification, like the steel tower steel pipe 1 shown in FIG. 1, the part which comprises one main pillar of a hollow steel pipe steel tower combining several steel pipe members is called "steel steel pipe."

Synthetic resins used as fillers are general-purpose plastics (vinyl chloride resin, heat-resistant vinyl chloride resin, polyethylene, polypropylene, polystyrene, ABS resin, AS resin, polymethyl methacrylate, polyvinylidene chloride, etc.), general-purpose engineering plastics (polyamide, polyethylene terephthalate) , Polyacetal, polycarbonate, modified polyphenylene oxide, polybutylene terephthalate, ultrahigh molecular weight polyethylene and poly (vinylidene fluoride)) and super engineering plastics (polysulfone, polyethersulfone, polyphenylene sulfide, polyarylate, polyetherimide, polyetheretherketone, polyimide) And polytetrafluoroethylene), phenol, urea, glass fiber reinforced Plastics, melamine, unsaturated polyester, epoxy, may be selected from thermosetting resins such as silicone and polyurethane.
However, when comprehensively evaluating lightness, leakage, and characteristic stability, it is preferable to select polystyrene foam (polystyrene) having the characteristics shown in Table 1 as a filler.
Below, the case where a polystyrene foam is selected as a filler is demonstrated as an example.

Next, the equipment used in the steel pipe tower internal rust prevention method according to this embodiment will be described with reference to FIGS.
In the steel pipe tower internal rust prevention method according to the present embodiment, as shown in FIG. 1, an extruder 10, a cable 20, a winch 41, a material supply machine 42, a generator 43 and a monitor 44 are used.

Here, as shown in FIG. 2, the extruder 10 has a cylindrical barrel 11 having an outer diameter of about 100 mm with a die 12 attached to the front end portion, and outer peripheral surfaces of the front end portion and the rear end portion of the barrel 11. Four guide rollers 13 _{1 to} 13 ₈ ( _four guide rollers 13 ₂ , 13 ₄ , 13 ₆ , and 13 ₈ attached to the front and back of FIG. 3 are not shown) and the rear end side of the barrel 11 Provided on the inner peripheral surface of the portion of the barrel 11 to which the extrusion screw 15 and the die 12 are attached. And a CCD camera 17 attached to the outer peripheral surface at the tip of the barrel 11.

As shown in FIG. 1, the cable 20 uses a plurality of cable supports 3 fixed to the other steel tower steel pipe or the ground via a rope or the like along the other steel tower steel pipe from the ground. After being stretched to the top of the steel tower steel pipe 1, an extruder 10 is attached to the tip and inserted into the internal space of the steel tower steel pipe 1.
As shown in FIG. 3, the pilot rope 21 is passed through the center of the cable 20, and the power cable 22, the raw material introduction pipe 23, the foaming agent introduction pipe 24 and the monitor cable 25 are connected to the pilot rope 21. It is passed to surround.

As shown in FIG. 2, one end of the pilot rope 21 is fixed to the rear end portion of the barrel 11 of the extruder 10, and the cable 20 is wound or unwound by using the winch 41 (see FIG. 1). The extruder 10 can be raised or lowered. At this time, since the guide rollers 13 _{1 to} 13 ₈ roll on the inner wall surface of the steel tower steel pipe 1 and the extruder 10 is pulled up or down, the extruder 10 is pulled up along the center line of the internal space of the steel tower steel pipe 1. Can be lowered or lowered.

  The front end of the power cable 22 is inserted into the barrel 11 from the rear end of the barrel 11 and then connected to the motor 14 and the heater 16 for heating. The end of the power cable 22 is connected to the generator 43 (see FIG. 1). )It is connected to the. Thereby, electric power can be supplied from the generator 43 to the motor 14 and the heater 16 via the power cable 22.

  The leading ends of the raw material introduction pipe 23 and the foaming agent introduction pipe 24 are inserted into the barrel 11 from the rear end of the barrel 11, and the ends of the raw material introduction pipe 23 and the foaming agent introduction pipe 24 are connected to the material feeder 42. It is connected. Thereby, the polystyrene resin (raw material) and the foaming agent (volatile foaming agent) can be supplied from the material supply machine 42 into the barrel 11 of the extruder 10 through the raw material introduction pipe 23 and the foaming agent introduction pipe 24, respectively. it can.

  The tip of the monitor cable 25 is attached to the outer peripheral surface of the barrel 11, the tip of the monitor cable 25 is connected to the CCD camera 17, and the end of the monitor cable 25 is connected to the monitor 44 (see FIG. 1). Yes. Thereby, power can be supplied to the CCD camera 17 and image data from the CCD camera 17 can be transmitted to the monitor 44.

Next, the work procedure in the steel pipe tower internal rust prevention method by a present Example is demonstrated with reference to FIG.
When the extruder 10 is attached to the tip of the cable 20 stretched on the top of the steel tower 1, the operator rewinds the cable 20 using the winch 41, so that the extruder 10 can be moved through the inner space of the steel tower 1. The steel pipe is gradually lowered to the bottom of the steel pipe 1.

  Thereafter, the worker turns on the power of the monitor 44, turns on the power of the generator 43, drives the motor 14 of the extruder 10 to rotate the extrusion screw 15, and turns on the heater 16 for heating. Subsequently, the worker turns on the power of the material supply machine 42 and supplies the polystyrene resin and the foaming agent to the inside of the barrel 11 of the extruder 10. Thereby, the polystyrene resin and the foaming agent are mixed by the extrusion screw 15 while being heated by the heater 16, and the polystyrene foam 30 (see FIG. 2) is generated. The produced polystyrene foam 30 advances toward the die 12 by the extrusion screw 15, is molded by the die 12, and is extruded from the extruder 10.

  While monitoring the image from the CCD camera 17 displayed on the monitor 44, the worker winds up the cable 20 using the winch 41 and gradually raises the extruder 10. Thereby, the internal space from the bottom of the steel tower steel pipe 1 to the top is filled with the expanded polystyrene 30.

  In addition, in an example of the trial calculation, when the inner space of the steel tower steel pipe 1 is filled with the expanded polystyrene 30, the load increase (Wt) is 0.116 t / leg, but the influence on the foundation 2 that supports the steel tower steel pipe 1 is as follows. There was no problem at all.

Next, a steel pipe tower internal rust prevention method according to a second embodiment of the present invention will be described with reference to FIGS.
The steel pipe tower internal rust prevention method according to the present embodiment eliminates the on-site filling work by incorporating a synthetic resin filling process at the end of the tower production process at the tower manufacturer when constructing a new railway line and rebuilding the tower. Quality filling is intended.

  In the steel pipe tower internal rust prevention method according to the present embodiment, after preparing the steel pipe 61 and the steel plate 62 as shown in FIG. 4 (a), the original dimensions of the steel pipe 61 and the steel plate 62 are taken as shown in FIG. 4 (b). Do. Subsequently, the steel pipe 61 and the steel plate 62 that have been dimensionally cut are cut, processed, and welded to produce a steel pipe member 63 as shown in FIG. Subsequently, as shown in FIG. 4 (d), a plurality of steel pipe members 63 are joined together to temporarily assemble a hollow steel pipe tower, and then the temporarily assembled hollow steel pipe tower is inspected.

  Thereafter, the temporarily assembled hollow steel pipe steel tower is released, and all the steel pipe members 63 are plated. Subsequently, as shown in FIG. 5A, the foamed polystyrene 82 is filled into the internal space of the steel pipe member 63 that has been subjected to the plating process by using a filler extruder 70. Subsequently, as shown in FIG. 5 (b), the foamed polystyrene 82 at the center of the steel pipe member 63 is scraped off by the drilling machine 71, and as shown in FIG. 5 (c), the foamed polystyrene is applied only to the inner wall surface of the steel pipe member 63. Leave 82. Thereby, since the weight reduction of the steel pipe member 63 can be achieved rather than the case where the foamed polystyrene 82 is filled in the entire interior space of the steel pipe member 63, the stability of the foundation 2 (see FIG. 1) can be further improved. .

  As described above, the steel pipe tower internal rust prevention method of the present invention can be used, for example, to prevent corrosion inside a steel pipe of a hollow steel pipe tower such as an overhead power transmission line tower.

It is a figure for demonstrating the steel pipe tower internal rust prevention method by the 1st Example of this invention. It is a figure for demonstrating the structure of the extruder 10 shown in FIG. It is a figure for demonstrating the structure of the cable 20 shown in FIG. It is a figure for demonstrating the steel pipe tower internal rust prevention method by the 2nd Example of this invention. It is a figure for demonstrating the steel pipe tower internal rust prevention method by the 2nd Example of this invention.

Explanation of symbols

1 tower steel pipe 2 basis 3 cable support 10 extruder 11 barrel 12 die _{131-134 8} guide rollers 14 motor 15 extruder screw 16 heater 17 CCD camera 20 cable 21 pilot rope 22 power cable 23 raw inlet tube 24 blowing agent Introduction pipe 25 Monitor cable 30, 82 Styrofoam 41 Winch 42 Material supply machine 43 Generator 44 Monitor 61 Steel pipe 62 Steel plate 63 Steel pipe member 70 Filler extruder 71 Drilling machine 82 Styrofoam

Claims (7)

A steel pipe tower internal rust prevention method used to prevent corrosion inside the steel pipe of the existing hollow steel pipe tower,
The extruder is gradually pulled up while extruding the synthetic resin by the extruder (10) inserted into the internal space of the steel tower steel pipe (1) constituting the hollow steel pipe steel tower, and the internal space of the steel tower steel pipe is drawn into the steel tower steel pipe Filled with the extruded synthetic resin from the bottom to the top,
A method for preventing rust inside a steel pipe tower. The extruder is
A barrel (11) with a die (12) attached to the tip;
Guide rollers (13 _{1 to} 13 ₈ ) attached to the outer surfaces of the front and rear ends of the barrel;
A motor (14) provided inside the rear end of the barrel;
An extrusion screw (15) provided inside the barrel and rotated by the motor;
A heater for heating (16) provided on an inner surface of a portion to which the extrusion screw and the die of the barrel are attached;
A camera (17) attached to the outer surface of the barrel tip;
The steel pipe tower internal rust prevention method of Claim 1 characterized by the above-mentioned. The extruder is attached to the tip of the cable (20);
A pilot rope (21) is passed through the center of the cable, and a power cable (22), a raw material introduction pipe (23), a foaming agent introduction pipe (24), and a monitor cable (25) are connected to the pilot rope. Passed through,
The steel pipe tower internal rust prevention method of Claim 1 or 2 characterized by the above-mentioned. One end of the pilot rope is fixed to the rear end of the barrel of the extruder, and the extruder is pulled up and down by winding and unwinding the cable using a winch (41). ,
From the generator (43) connected to the end of the power cable, the front end of the power cable is connected to the motor and the heater after being inserted into the barrel from the rear end of the barrel. Supplying electric power to the motor and the heater for heating via the power cable;
The raw material introduction pipe and the leading end of the foaming agent introduction pipe are inserted into the barrel from the rear end of the barrel, and the ends of the raw material introduction pipe and the foaming agent introduction pipe are connected to the material feeder (42). Connected to each of the raw material introduction pipe and the foaming agent introduction pipe through the raw material introduction pipe and the foaming agent introduction pipe, respectively.
The end of the monitor cable is connected to the camera, and the end of the monitor cable is connected to a monitor (44), and power is supplied from the monitor to the camera via the monitor cable and the monitor is connected to the monitor. Send image data to
The steel pipe tower internal rust prevention method of Claim 3 characterized by the above-mentioned. Fill the inner space of the plated steel pipe member (63) with synthetic resin,
Scraping off the filled synthetic resin at the center of the steel pipe member, leaving the synthetic resin only on the inner wall surface of the steel pipe member;
A method for preventing rust inside a steel pipe tower. The synthetic resin is selected from a general-purpose plastic, a thermoplastic resin including a general engineering plastic and a super engineering plastic, and a thermosetting resin, and is selected by comprehensively evaluating lightness, leakage, and characteristic stability. The steel pipe tower internal rust prevention method of Claim 1 thru | or 5 . The steel pipe tower internal rust prevention method according to claim 6 , wherein the synthetic resin is polystyrene foam.

Images