JP3314178B2 - Heavy Corrosion Resistant Steel Pipe Pile, Its Manufacturing Method and Its Use - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heavy-duty corrosion-resistant steel pipe pile used for supporting various structures in a water area such as a harbor or a river, or a watertight enclosed area which is driven into the ground when constructing a structure. The present invention relates to a heavy-duty corrosion-resistant steel pipe sheet pile (hereinafter, the steel pipe pile and the steel pipe sheet pile are collectively referred to simply as a steel pipe pile in the claims and the like), a method of manufacturing the same, and a method of using the same.

[0002]

2. Description of the Related Art Steel pipe piles are used not only for foundation piles of land-based buildings, but also for seawalls and seawalls and footing foundations, as well as for offshore structures, construction steel materials that can be used in deep water and soft ground. Widely used as. Steel pipe sheet piles are also driven into the ground during construction of the structure.

Conventionally, steel pipe piles and the like used in harbors and river waters have generally been used barely, but recently, even in structures in harbors and river waters, long-term durability for 40 to 50 years is required. Therefore, steel pipe piles used in these severe corrosive environments have to be provided with anticorrosion measures to maintain a long-term anticorrosion function.

[0004] Conventionally, as a method of manufacturing a heavy-duty corrosion-resistant steel pipe pile,
There are a method of applying a coating layer of polyethylene on the surface of the steel pipe and a method of applying a coating layer of polyurethane. FIG.
In FIG. 19, a polyethylene sheet is wound around the outer surface of the splash zone 4, the tidal zone 5, and a portion slightly lower than that (including the steel pipe upper part 6) in the steel pipe pile 3 driven into the underwater ground 1. Alternatively, a coating layer 7 made of polyurethane spray coating is integrally applied.

[0005] The lower steel pipe portion of the heavy-corrosion steel pipe pile 3 constructed as described above is driven into the submarine ground 1, for example, the seabed ground, through the rubble layer 2, and then each heavy-corrosion steel pipe pile 3 is formed. Reinforcing (not shown) is performed over the pipe head 8, and the concrete footing foundation 1 is attached to the pipe head 8 via the reinforcing bar.
0 is built.

The process of applying the coating layer 7 on the surface of the steel material on the upper portion 6 of the steel pipe is shown in the flowcharts of FIGS. FIG. 20 is a flowchart of an example in which a coating layer made of polyethylene is applied to the surface of a steel pipe. In this example, first, shot blast (steel grains), grit blast (steel crushed grains), sand blast (sand grains), etc. are applied to the entire surface of a steel pipe pile. Mechanical blasting to remove harmful rust and other foreign matter. Next, the surface of the steel pipe pile is heated to a required temperature, and a primer (surface treatment agent) is further applied. The application method is performed by a method such as roller brush, spatula or spray. Next, an adhesive is applied to the surface of the steel pipe. Then, simultaneously with or immediately after the application of the adhesive, a polyethylene sheet is extruded on the surface of the steel pipe continuously moving in the axial direction in a rotating or non-rotating state by an extruder, and the so-called T-die method or round die method is used. Coat continuously.

FIG. 21 is a flow chart of an example in which a coating layer is applied to the surface of a steel pipe by using polyurethane. In this example, a primer treatment (surface treatment agent) is first applied to the surface of the steel pipe, then a primer (surface treatment agent) is applied, and then polyurethane is sprayed. Coating is performed, and then pipe end refining is performed.

In the above, in the case of a steel pipe pile, since the surface of the steel pipe is a flat surface, both of polyethylene coating and polyurethane spray coating can be adopted. In the case of a steel sheet pile, joints having various cross-sectional shapes are provided on the side of the steel pipe. Is provided, the surface of the steel pipe is not flat, so that only the polyurethane spray coating is performed and the polyethylene coating is not performed.

As shown in FIGS. 16 and 18,
Conventionally, the pipe head 8 of a heavy-duty corrosion-resistant steel pipe pile has a footing foundation 10
In order not to lower the adhesive force of the concrete to the concrete, it has been manufactured and shipped in a state where it is not covered (uncovered part) over a predetermined dimension. The length L of the uncoated portion differs depending on the steel pipe diameter, and is generally equal to or larger than the steel pipe diameter (D) (L ≧ D). Further, as shown in FIG. 19, the coating layer (heavy anticorrosion portion) 7 is designed to be embedded in the footing base 10 by about 100 mm.

[0010]

The steel pipe pile 3 of heavy corrosion protection is
In many cases, this is driven into the underwater ground, and depending on the construction scale, construction of the footing foundation 10 is started after a period of about six months has elapsed, during which time the pipe head 8
Since the uncovered part of the pipe is exposed to seawater in the state of a bare pipe, barnacles (Fujitsubo), seaweed, etc. adhere to the pipe head 8, and the work of removing these deposits immediately before the construction of the footing foundation is required. It is necessary, this work is difficult, it takes a long construction period,
There was a disadvantage that the construction cost was increased.

The present invention has been proposed in order to improve the above-mentioned drawbacks. The heavy corrosion protection structure of a steel pipe pile (steel pipe sheet pile) basically has the same specifications as the conventional one, and mainly the structure of the pipe head is improved. This makes it possible to easily remove the extraneous matter adhering to the head portion of the heavy-duty corrosion-resistant steel pipe that has been driven into the underwater ground with a simple operation immediately before concrete construction.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a steel pipe pile driven into a submerged ground, in which a release layer is formed on the surface of the steel pipe at the head of the pipe, and a non-release layer is formed on the surface of the steel pipe at other portions. A release layer is provided, a polyethylene sheet is attached to the surface of the steel pipe, or a coating layer formed by spray coating of polyurethane is provided on the surface of the steel pipe over the release layer and the non-release layer. A means for displaying a boundary with the release layer is provided.

[0013] The method for manufacturing a heavy-duty corrosion-resistant steel pipe pile according to the present invention comprises:
After blasting and primer treatment on the surface of the steel pipe pile driven into the underwater ground, a release layer is provided on the surface of the steel pipe at the head of the pipe, and an adhesive is applied as a non-release layer on the surface of the steel pipe at other parts Then, a polyethylene sheet is continuously attached to the surface of the steel pipe over the release layer and the non-release layer, and boundary indication means is provided on the polyethylene sheet at a boundary between the release layer and the adhesive layer. And the polyethylene sheet covering the pipe head is provided so as to be separable from the surface of the steel pipe using the boundary indicating means as a separation line.

Further, in the method for manufacturing a heavy-duty corrosion-resistant steel pipe pile according to the present invention, the surface of the steel pipe pile driven into the submarine ground is subjected to blasting and primer treatment, and then a release layer is formed on the surface of the steel pipe at the pipe head. A non-releasing layer is provided on the surface of the steel pipe other than the pipe head, and polyurethane is sprayed on the steel pipe surface across the releasing layer and the non-releasing layer, and the release layer and the non-releasing layer Boundary indication means is provided on the polyurethane spray coating layer at a boundary between the polyurethane spray coating layer and the polyurethane covering the pipe head is provided so as to be separable from the surface of the steel pipe using the boundary indication means as a separation line. And

Further, the method of using the heavy-corrosion-resistant steel pipe pile according to the present invention includes providing a release layer on the surface of the steel pipe at the head of the pipe, a non-release layer at other portions, and the release layer and the non-release layer. A steel pipe pile having a polyethylene sheet mounted thereon or a coating layer formed by spray coating with polyurethane, and a means for indicating a boundary between the release layer and the non-release layer provided on the surface of the steel pipe. The steel pipe pile is driven into the underwater ground so that the coating layer is located in a tidal zone and a splash zone in the water, and before the footing foundation is constructed, the coating layer covering the pipe head is removed from the release layer. And the footing foundation is constructed on the steel pipe surface of the pipe head from which the coating layer has been released.

According to the present invention, on the pipe head of the steel pipe pile driven into the underwater ground, deposits such as barnacles and seaweed adhere to the coating layer. At the time of installation, by using the boundary indicating means as a separation line and separating the upper coating layer from the surface of the steel pipe via the release layer, the deposits together with the coating layer can be easily removed from the pipe head. Since the pipe head is covered just before the footing foundation is constructed, there is no deterioration of the pipe head due to adhesion of deposits or the like.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show a heavy corrosion-resistant steel pipe pile 13 in which a coating layer made of polyethylene is applied to the surface of the steel pipe, and a manufacturing process thereof. As shown in each figure, after the surface of the steel pipe of the steel pipe pile 13 driven into the underwater ground is subjected to the blasting treatment, the release paint coating layer 11 is provided on the surface of the steel pipe at the pipe head 18 at the upper part 16 of the steel pipe. Further, a primer (surface treatment material) is applied to the surface of the steel pipe excluding the pipe head 18 or the entire surface of the steel pipe including the pipe head 18. Thereafter, the adhesive 12 is applied to the surface of the steel pipe excluding the pipe head 18 or the entire surface of the steel pipe including the pipe head 18, and the pipe head 18 and another portion (that is, a coating layer of the adhesive 12). And a polyethylene sheet 14 is attached. In mounting the polyethylene sheet 14 on the surface of the steel pipe, the steel pipe is axially moved while being rotated by a guide roll (not shown), and the polyethylene sheet 14 is continuously applied to the surface of the steel pipe from an extruder (not shown). Extrusion is performed by the so-called T-die method, or the so-called round die method in which the steel pipe is moved straight without rotating and the polyethylene extruded in a cylindrical shape is coated on the surface of the steel pipe, whereby the polyethylene sheet 14 is continuously mounted on the steel pipe surface. You.

The above-mentioned pipe head (that is, a part which is formed as a release layer by applying a release coating to the surface of the steel pipe) 18 and another part (that is, a part where the adhesive 12 is applied and the non-release layer is formed) Is provided in the circumferential direction as a means for displaying the boundary with the notch. Note that a paint mark line or the like may be displayed instead of the cutout portion 15. The steel pipe pile 13 by covering the polyethylene sheet 14 is:
It is manufactured through the steps shown in the flowchart of FIG.

FIGS. 5 to 8 show a heavy-corrosion-resistant steel pipe pile 13 in which a coating layer composed of a polyurethane spray coating layer 20 is applied to the steel pipe surface of the steel pipe upper part 16 and a manufacturing process thereof. As shown in each figure, after a blast treatment is applied to the steel pipe pile 13 driven into the underwater ground, a primer (surface treatment material) is applied to the steel pipe surface, and the steel pipe surface at the pipe head 18 is further applied. The release layer 17 is formed by manually winding a release paper or a PL film (such as a PVC film), and the pipe head 18 in the steel pipe upper part 16 is formed.
And polyurethane spray coating layer 20
Is applied.

The above-mentioned tube head (that is, the portion where the release layer 17 is formed by winding a release paper or a PL film) 15
As a means for indicating the boundary between the non-release layer 21 to which the release layer 17 is not applied (that is, the layer in which the polyurethane spray coating layer 20 is integrally attached to the surface of the steel pipe) 21, Are provided in the circumferential direction. Note that, in this example as well, a marking line or the like may be displayed instead of the cutout portion 15. The steel pipe pile 13 of heavy corrosion protection by covering the polyurethane spray coating layer 20 is manufactured through the steps shown in the flowchart of FIG.

Each of the heavy-corrosion steel pipe piles 13 is shown in FIGS.
The steel pipe pile 13 whose pipe head 18 is covered with a polyethylene sheet 14 in a releasable manner will be described below. FIG. 9 shows a state in which a plurality of steel pipe piles 13 are inserted into the rubble layer 2 and are driven into the underwater ground 1. At this time, the coating layer of the polyethylene sheet 14 on the steel pipe upper part 16 including the pipe head 18 is shown. The height relationship between the seawater splash zone 4 and the tidal zone 5 is as shown in the figure. In this state, usually about six months have elapsed, during which time the adherence of barnacles, seaweed, and the like to the polyethylene sheet 14 at the pipe head 18 adheres.

Next, immediately before constructing the footing concrete foundation as shown in FIG. 10, the polyethylene sheet 14 is peeled from the steel pipe surface of the pipe head 18. This is to ensure the connection between the steel pipe pile 13 and the concrete of the footing foundation. To remove the polyethylene sheet 14, above the notch 15 in the circumferential direction,
The polyethylene sheet 14 is provided with a notch (not shown) in the vertical direction to the surface of the steel pipe, and the cut in the vertical direction and the cutout 15 in the circumferential direction are cut at the pipe head 18. Sheet 14
Can be easily peeled off from the surface of the steel pipe (the peeling in the case of the polyurethane spray coating layer 20 is similarly performed). At this time, the adhering substances such as barnacles and seaweed adhering to the surface of the polyethylene sheet 14 are also removed from the tube head 18 together. Length l of polyethylene sheet 14 to be peeled
And the diameter D of the steel pipe, as in the related art, may be set to satisfy l ≧ D.

Thus, the pipe head 18 of the steel pipe pile 13
After the coating layer of the polyethylene sheet 14 is removed from
As shown in FIG. 12, the footing foundation 10 is constructed on the pipe head 18 where the steel pipe surface is exposed via reinforcing bars (not shown). At this time, the heavy anticorrosion portion of the polyethylene sheet 14 is designed to be embedded in the footing base portion 10 by about 100 mm.

FIGS. 13 to 15 are views showing an embodiment in which the present invention is applied to a steel pipe sheet pile. The steel pipe sheet pile 23 is made of a steel pipe main body 24.
The pipe joint 25 having the engagement groove 22 and the T-joint 26 which can be engaged with the pipe joint 25 via the engagement groove 22 along the longitudinal direction at the side symmetric position of the steel pipe main body. 24
Is not a flat surface. Of course, as shown in FIGS. 13 and 14, the upper end 27 of the pipe joint 25 and the T-shaped joint 26 does not extend to the upper end of the steel pipe main body 24, but the pipe head 2.
8 stops at the lower end, so that the circumferential surface of the tube head 28 is a flat surface.

As in the case of the steel pipe pile 13, the formation of the coating layer on the pipe head 28 in the steel pipe sheet pile 23 can be carried out by mounting a polyethylene sheet or spray-coating polyurethane. , The formation of the coating layer,
Due to the work efficiency, the operation is performed continuously over the entire length of the steel pipe sheet pile 23. Therefore, in the steel pipe sheet pile 23 in which the pipe joint 25 and the T-shaped joint 26 are provided in a portion excluding the pipe head 28 and the pipe surface of the portion is not flat, it is not possible to form the coating layer smoothly by mounting the polyethylene sheet. Can not.

Therefore, in the case of the steel pipe sheet pile 23, the coating layer 20 formed by spraying polyurethane is formed over the pipe head 28 and other parts by the same method as shown in FIGS. Also, with the pipe joint 25 and the T-shaped joint 26,
In the steel pipe sheet pile 23 in which the steel pipe main bodies 24 are connected to each other, a half circumference of the steel pipe main body 24 comes in contact with seawater or the like, and attached matter such as barnacles and seaweed adheres, but the other half circumference comes in contact with the ground side and no attached matter adheres. Since there is a construction form, in this case, as shown in FIG. 15, the polyurethane spray coating layer 20 may be formed only on a half-periphery portion of the steel pipe main body 24 on the side to which the deposits adhere. Also in the above-mentioned steel pipe sheet pile 23, similarly to the case of the steel pipe pile 13, the polyurethane spray coating layer 20 to which the adhered substance has adhered from the pipe head 28 via the release layer (not shown) can be easily cut off.

The joint structure of the steel pipe sheet pile 23 includes an LT type and a PP type in addition to the above-mentioned PT type.
The present invention can also be used for steel pipe sheet piles having these joint structures.

[0028]

As described above, the heavy-duty corrosion-resistant steel pipe pile according to the present invention has a coating layer at the pipe head with a release layer interposed therebetween. Immediately before constructing the footing foundation on the pipe head, the coating layer is cut off from the pipe head via the release layer, the steel pipe surface of the pipe head is exposed, and concrete for the footing foundation is constructed. The adhering matter such as barnacles and seaweed adhering to the coating layer can be removed from the pipe head together with the coating layer. The efficiency of construction work is greatly improved, and the production cost is reduced. Furthermore, since the pipe head of the steel pipe pile is covered with the coating layer from the time when the steel pipe pile is driven into the underwater ground until the concrete for footing foundation is installed, the steel pipe of the pipe head is No deposits adhere to the surface as in the prior art. For this reason, the quality of the surface of the steel pipe is improved, and the reinforcement of the pipe head is welded to the pipe head, and the quality and strength of the pipe head on which the concrete of the footing foundation is constructed through the reinforcement is improved, and a higher It has the effect of building a footing foundation of quality.

[Brief description of the drawings]

FIG. 1 is a side view of a heavy duty steel pipe pile according to a first embodiment of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of a heavy-duty anticorrosion portion at the upper part of the steel pipe pile of FIG.

FIG. 3 is a vertical sectional view taken along the line AA of FIG. 2;

FIG. 4 is a flowchart showing a process of manufacturing the heavy duty corrosion-resistant steel pipe pile of FIG.

FIG. 5 is a side view of a heavy-duty corrosion-resistant steel pipe pile according to a second embodiment of the present invention.

FIG. 6 is an enlarged vertical sectional view of a heavy-duty anticorrosion portion at the upper part of the steel pipe pile of FIG. 5;

FIG. 7 is a sectional view taken along the line BB of FIG. 6;

FIG. 8 is a flowchart showing a process of manufacturing the heavy duty corrosion-resistant steel pipe pile of FIG.

FIG. 9 is an explanatory side view showing a state in which the heavy-duty corrosion-resistant steel pipe pile of the present invention is driven into the underwater ground.

FIG. 10 is an explanatory side view showing a state in which a coating layer is separated from a pipe head of the heavy-duty corrosion-resistant steel pipe pile in FIG. 9;

FIG. 11 is an enlarged view of the upper part of the steel pipe pile in FIG.

FIG. 12 is an explanatory side sectional view of a state in which concrete of a footing foundation is cast on the pipe head of the heavy-corrosion-resistant steel pipe pile of FIG. 10;

FIG. 13 is a side view of a steel pipe sheet pile shown as a second embodiment of the present invention.

FIG. 14 is another side view of the steel pipe sheet pile shown in FIG.

FIG. 15 is a partial cross-sectional view of a steel pipe sheet pile in which opposed joint portions are engaged.

FIG. 16 is a side view of a conventional heavy corrosion-resistant steel pipe pile.

FIG. 17 is a sectional view taken along the line CC in FIG. 16;

FIG. 18 is an explanatory side view showing a state in which a conventional heavy-corrosion-resistant steel pipe pile is driven into the underwater ground.

FIG. 19 is an explanatory side sectional view showing a state in which concrete of a footing foundation is cast on the pipe head of the heavy-corrosion-resistant steel pipe pile of FIG. 18;

FIG. 20 is a flowchart showing a process of manufacturing a heavy-duty corrosion-resistant steel pipe pile by a conventional polyethylene coating.

FIG. 21 is a flowchart showing a process of manufacturing a heavy-duty corrosion-resistant steel pipe pile by coating with a conventional polyurethane spray coating.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 underwater ground 2 rubble layer 3 steel pipe pile 4 splash zone 5 tidal zone 6 steel pipe upper part 7 coating layer 8 pipe head 10 footing foundation 11 release paint coating layer 12 adhesive 13 steel pipe pile 14 polyethylene sheet 15 cut part 16 steel pipe upper part 17 Release layer 18 Pipe head 20 Polyurethane spray coating layer 21 Non-release layer 22 Engagement groove 23 Steel pipe sheet pile 24 Steel pipe main body 25 Pipe joint 26 T-shaped joint 27 Upper end 28 Pipe head

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-158958 (JP, A) JP-A-60-165542 (JP, U) JP-A-62-185753 (JP, U) JP-A-62 185752 (JP, U) Japanese Utility Model 63-190343 (JP, U) Japanese Utility Model 59-167846 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 5/28 E02B 3 / 06 E02D 5/60 E02D 27/12

Claims (4)

(57) [Claims] 1. A steel pipe pile driven into a submarine ground,
A release layer is provided on the surface of the steel pipe at the head of the pipe, and a non-release layer is provided on the surface of the steel pipe at other portions. A polyethylene sheet is attached to the surface of the steel pipe or the polyurethane is blown over the release layer and the non-release layer. A heavy-duty corrosion-resistant steel pipe pile, comprising: a coating layer formed by applying paint; and means for indicating a boundary between the release layer and the non-release layer. 2. The surface of a steel pipe pile driven into the underwater ground is subjected to blasting and primer treatment, and a release layer is provided on the surface of the steel pipe at the head of the pipe. An adhesive is applied as above, a polyethylene sheet is continuously attached to the surface of the steel pipe over the release layer and the non-release layer, and the polyethylene is positioned at a boundary between the release layer and the non-release layer. A method for manufacturing a heavy duty corrosion-resistant steel pipe pile, characterized in that a boundary indicating means is provided on a sheet, and the polyethylene sheet covering the pipe head is provided so as to be separable from the surface of the steel pipe using the boundary indicating means as a separating line. 3. A blast treatment and a primer treatment are performed on the surface of a steel pipe pile driven into the underwater ground, and then a release layer is formed on the surface of the steel pipe at the head of the pipe, and the surface of the steel pipe at other portions excluding the head of the pipe is provided. A polyurethane layer is sprayed on the surface of the steel pipe over the release layer and the non-release layer, and the polyurethane spray coating layer is located at a boundary between the release layer and the non-release layer. Wherein the polyurethane for covering the pipe head is provided so as to be separable from the surface of the steel pipe using the boundary display means as a separation line. 4. A release layer is provided on the surface of the steel pipe at the head of the pipe, and a non-release layer is provided on the surface of the steel pipe at the other portion, and a polyethylene sheet is provided on the surface of the steel pipe over the release layer and the non-release layer. A steel pipe pile provided with a coating layer made of spray-painted polyurethane or provided with means for indicating a boundary between the release layer and the non-release layer is provided on the coating layer. Driving the underwater ground so that the coating layer is located in the tidal zone and the splash zone in the water, before building the footing foundation, separating the coating layer covering the pipe head via the release layer, and releasing the coating layer. A method for using a heavy-duty corrosion-resistant steel pipe pile, wherein the footing foundation is constructed on the steel pipe surface of the pipe head.