JPH09217347A - Heavy anticorrosive steel pipe pile, its manufacture, and its using method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the removing work of a deposit adhered to the pipe head part of a heavy anticorrosive steel pipe pile driven into water bottom ground. SOLUTION: In a steel pipe pile 13 to be driven into water bottom ground, it has a release layer on the steel pipe surface of a pipe head part 18, and a non-release layer on the steel pipe surface of the other part. A coating layer formed of the winding of a polyethylene sheet 14 or the spray coating of polyurethane is formed on the steel pipe surface, extending from the release layer to the non-release layer, and an extension slit part 15 is circumferentially on the coating layer as a means for displaying the boundary between the release layer and the non-release layer.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Steel pipe piles are steel materials for construction that can be applied not only to foundation piles for land-based buildings but also to revetments and footing foundations for harbors and rivers, as well as offshore structures for deep water and soft ground. Widely used as. A steel pipe sheet pile is also used by being driven into the ground when constructing the structure.

The steel pipe piles and the like used in harbors and river waters have generally been used bare in the past, but in recent years, structures in ports and river waters also require long-term durability for 40 to 50 years. Therefore, steel pipe piles used under these severe corrosive environments have been required to be subjected to anticorrosion measures for maintaining a long-term anticorrosion function.

Conventionally, as a method for manufacturing a heavy 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.
FIG. 19 shows that a polyethylene sheet is wound around the outer surface of the splash zone 4 and the tidal zone 5 of the steel pipe pile 3 driven into the subsoil 1 and a portion slightly lower than that (including the upper portion of the steel pipe 6). Alternatively, the covering layer 7 formed by polyurethane spray coating is integrally applied.

The lower steel pipe portion of the heavy-duty corrosion-resistant steel pipe pile 3 thus constructed is driven into the water bottom ground 1, for example, the seabed ground, through the rubble layer 2, and then the heavy-duty corrosion protection steel pipe pile 3 is A reinforcing bar (not shown) is arranged over the pipe head 8, and a concrete footing foundation 1 is attached to the pipe head 8 through this bar arrangement.
0 is built.

The steps of depositing the coating layer 7 on the steel material surface of the steel pipe upper portion 6 are shown in the flow charts of FIGS. 20 and 21. FIG. 20 is a flowchart of an example in which a coating layer 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 formed on the surface of a steel pipe pile over its entire length. Mechanical blasting is applied to remove harmful rust and other foreign substances. 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 a roller brush, a spatula, a spray, or the like. Next, an adhesive is applied to the surface of the steel pipe. Next, at the same time as or immediately after the application of the adhesive, a polyethylene sheet is extruded by an extruder onto the surface of the steel pipe that is continuously rotating in the axial direction in a rotating or non-rotating state, and the so-called T-die method or round die method is used. Coating continuously.

FIG. 21 is a flow chart of an example of applying a coating layer to the surface of a steel pipe with polyurethane. In this example, the surface treatment of the steel pipe surface is first performed, then a primer (surface treatment agent) is applied, and then polyurethane is sprayed. Paint and then adjust the pipe ends.

In the above, in the case of the steel pipe pile, since the surface of the steel pipe is a flat surface, either polyethylene coating or polyurethane spray coating can be adopted, but in the case of a steel pipe sheet pile, a joint having various sectional shapes on the side surface of the steel pipe. Due to the fact that the steel pipe surface is not flat, only the polyurethane spray coating is applied, not the polyethylene coating.

Further, as shown in FIGS. 16 and 18,
Conventionally, the pipe head 8 of the heavy corrosion protection steel pipe pile is the footing foundation 10
In order to prevent the adhesive strength from the concrete from being reduced, it was manufactured and shipped in a state where it was not covered (a non-coated portion) over a predetermined dimension. The length L of the uncovered portion varies depending on the steel pipe diameter, and is generally set to the steel pipe diameter (D) or more (L ≧ D). Further, as shown in FIG. 19, the coating layer (heavy anticorrosion portion) 7 is designed to be embedded in the footing foundation 10 by about 100 mm.

[0010]

The steel pipe pile 3 of heavy corrosion protection is
In many cases, this is driven into the submarine ground, and construction of the footing foundation 10 is started after a period of about 6 months has elapsed depending on the scale of construction, and the pipe head 8
Since the non-coated part of is exposed to seawater in the state of a bare pipe, barnacles (Fujitsubo), seaweed, etc. adhere to this pipe head 8 and work to remove these deposits immediately before construction of the footing foundation is required. It is necessary, this work is difficult and the construction period is long,
There was a drawback that it would lead to an increase in construction costs.

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 conventional specifications, and mainly improves the structure of the pipe head. Thus, the work of removing the deposits attached to the pipe head of the heavy corrosion-resistant steel pipe driven into the water bottom ground can be easily performed by a simple work immediately before concrete construction.

[0012]

In order to achieve the above object, the present invention relates to a steel pipe pile driven into the subsea ground, in which a release layer is provided on the steel pipe surface of the pipe head, and a release layer is not provided on the steel pipe surface of other parts. A release layer is provided, a polyethylene sheet is attached to the surface of the steel pipe over the release layer and the non-release layer, or a coating layer made of polyurethane spray coating is provided, and the release layer and the release layer are not covered with each other. It is characterized in that means for displaying the boundary with the release layer is provided.

The method for manufacturing a heavy corrosion-resistant steel pipe pile according to the present invention comprises:
The surface of the steel pipe pile driven into the water bottom ground is subjected to blasting and primer treatment, a release layer is provided on the steel pipe surface of the pipe head, and an adhesive is applied as a non-release layer to the steel pipe surface of other parts. Then, a polyethylene sheet is continuously attached to the surface of the steel pipe straddling the release layer and the non-release layer, and the polyethylene sheet is provided with a boundary display means at the boundary between the release layer and the adhesive layer. The polyethylene sheet covering the pipe head is provided so as to be separable from the surface of the steel pipe by using the boundary display means as a separation line.

Further, in the method for producing a heavy-corrosion-proof steel pipe pile according to the present invention, a blast treatment and a primer treatment are applied to the surface of the steel pipe pile driven into the submarine ground, and then a release layer is formed on the steel pipe surface of the pipe head. , A non-release layer is provided on the surface of the steel pipe other than the pipe head, polyurethane is sprayed on the steel pipe surface across the release layer and the non-release layer, and the release layer and the non-release layer Boundary indicating means is provided on the polyurethane spray coating layer at the boundary with the polyurethane spray coating layer, and the polyurethane for covering the pipe head is provided so as to be separable from the steel pipe surface by using the boundary indicating means as a separation line. And

Further, in the method of using the heavy-corrosion-proof steel pipe pile according to the present invention, a release layer is provided on the surface of the steel pipe of the pipe head, and a non-release layer is provided at other portions, and the release layer and the non-release layer are provided. A steel pipe pile in which a polyethylene sheet is attached to the surface of the steel pipe or a coating layer made of polyurethane spray coating is provided on the surface of the steel pipe, and a means for indicating the boundary between the release layer and the non-release layer is provided on the coating layer. The steel pipe pile is driven into the submarine ground so that the coating layer is located in the underwater tidal zone and the splash zone, and before the footing foundation is constructed, the coating layer that covers the pipe head is the release layer. It is characterized in that the footing foundation is constructed on the steel pipe surface of the pipe head in which the coating layer has been released from the pipe head.

According to the present invention, since the deposits such as barnacles and seaweed adhere on the coating layer in the pipe head of the steel pipe pile driven into the subseabed ground, the pipe head is cast with footing foundation concrete. At the time of installation, by separating the coating layer on the upper side from the surface of the steel pipe through the release layer using the boundary display means as a separation line, it is possible to easily remove the deposit together with the coating layer from the pipe head. In addition, since the pipe head is covered until just before the footing foundation is constructed, the pipe head is not deteriorated due to adhered substances.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a heavy-corrosion-proof steel pipe pile 13 in which a coating layer made of polyethylene is applied to the surface of the steel pipe, and its manufacturing process. As shown in each drawing, after the steel pipe surface of the steel pipe pile 13 to be driven into the water bottom ground has been subjected to blasting, the release coating material application layer 11 is provided on the steel pipe surface at the steel pipe upper portion 16 at the pipe head portion 18. Further, a primer (surface treatment material) is applied to the surface of the steel pipe excluding the pipe head 18 or the surface of the entire length of the steel pipe including the pipe head 18. After that, the adhesive 12 is applied to the surface of the steel pipe excluding the pipe head 18 or the surface of the entire length of the steel pipe including the pipe head 18, and the pipe head 18 and other parts (that is, a coating layer of the adhesive 12). A polyethylene sheet 14 is attached across the floor. The mounting of the polyethylene sheet 14 on the surface of the steel pipe is carried out by rotating the steel pipe by a guide roll (not shown) while moving it in the axial direction, while continuously pushing the polyethylene sheet 14 onto the surface of the steel pipe from an extruder (not shown). The so-called T-die method or the so-called circular die method in which the steel pipe surface is covered with polyethylene extruded in a cylindrical shape by straightening the steel pipe without rotating it, and the polyethylene sheet 14 is continuously attached to the steel pipe surface by these. It

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

5 to 8 show a heavy-corrosion-proof steel pipe pile 13 in which a coating layer made of a polyurethane spray coating layer 20 is applied to the steel pipe surface of the steel pipe upper portion 16 and the manufacturing process thereof. As shown in each figure, after the steel pipe pile 13 to be driven into the water bottom ground has been blasted, 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 vinyl chloride type) on the pipe head 18 at the steel pipe upper portion 16.
Polyurethane spray coating layer 20 spanning over other parts
A coating layer consisting of is applied.

The tube head (that is, the portion where the release layer 17 is formed by winding release paper or PL film) 15
And the non-releasing layer 21 (that is, the layer on which the polyurethane spray coating layer 20 is integrally attached to the surface of the steel pipe) 21 on which the releasing layer 17 is not applied, as a means for displaying the boundary, Are provided in the circumferential direction. Note that, in this example as well, a scribe line or the like may be displayed instead of the cut portion 15. The heavy-duty anti-corrosion steel pipe pile 13 covered with the polyurethane spray coating layer 20 is manufactured through the steps shown in the flowchart of FIG.

Each of the heavy-duty anticorrosion steel pipe piles 13 is shown in FIGS.
It is driven into the seabed through the steps shown in 2 (hereinafter, an example of the steel pipe pile 13 in which the pipe head 18 is releasably covered with the polyethylene sheet 14 will be described). FIG. 9 shows a state in which a plurality of steel pipe piles 13 are inserted into the water bottom ground 1 through the rubble layer 2, and at this time, the coating layer of the polyethylene sheet 14 of the steel pipe upper portion 16 including the pipe head 18 The height relationship between the seawater splash zone 4 and the tidal zone 5 is as shown in the figure. About six months usually elapses in this state, and during that time, deposits such as barnacles and seaweed adhere to the polyethylene sheet 14 on the tube head 18.

Immediately before building the footing concrete foundation as shown in FIG. 10, the polyethylene sheet 14 is peeled off 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,
A vertical cut (not shown) is made in the polyethylene sheet 14 until it reaches the surface of the steel pipe, and the vertical cut and the circumferential cut 15 are cut to cut the polyethylene in 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 also carried out similarly). At this time, the attached substances such as barnacles and seaweed attached to the surface of the polyethylene sheet 14 are also removed from the pipe head 18. The peeled length l of the polyethylene sheet 14
And the steel pipe diameter D, it is preferable to provide the relationship of 1 ≧ D as in the conventional case.

In this way, the pipe head 18 of the steel pipe pile 13
After the covering layer of the polyethylene sheet 14 is removed from the
As shown in FIG. 12, the footing foundation 10 is constructed on the pipe head portion 18 where the surface of the steel pipe is exposed through the 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.

13 to 15 are views showing an example in which the present invention is applied to a steel pipe sheet pile. The steel pipe sheet pile 23 includes a steel pipe body 24.
Since the pipe joint 25 having the engagement groove 22 and the T-shaped joint 26 that can be engaged with the pipe joint 25 through the engagement groove 22 are provided along the longitudinal direction at the side surface symmetrical position of the steel pipe body. 24
The surface of is not a flat surface. Of course, as shown in FIGS. 13 and 14, the pipe joint 25 and the upper end 27 of the T-shaped joint 26 do not extend to the upper end of the steel pipe body 24, but the pipe head 2
It stops at the lower end of 8, and thus 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 of the pipe head 28 on the steel pipe sheet pile 23 may be performed by attaching a polyethylene sheet or by spraying with polyurethane, but in either case. , The formation of the coating layer,
Due to the work efficiency, the steel pipe sheet pile 23 is continuously processed over its entire length. Therefore, in the steel pipe sheet pile 23 having the pipe joint 25 and the T-shaped joint 26 in the portion excluding the pipe head 28 and the pipe surface of the portion is not flat, it is difficult to smoothly form the coating layer by mounting the polyethylene sheet. Can not.

Therefore, in the case of the steel pipe sheet pile 23, the coating layer 20 is formed by spraying polyurethane over the pipe head 28 and other portions 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, half the circumference of the steel pipe main body 24 is in contact with seawater or the like and deposits such as barnacles and seaweed are attached thereto, but the other half periphery is in contact with the ground side and the deposits are not attached thereto. Since there is a construction mode, in this case, as shown in FIG. 15, the polyurethane spray coating layer 20 may be formed only on the half circumference portion of the steel pipe body 24 on the side to which the deposit is attached. Also in the above-mentioned steel pipe sheet pile 23, as in the case of the steel pipe pile 13, the polyurethane spray coating layer 20 to which the adhered matter is attached can be easily separated from the pipe head portion 28 via the release layer (not shown).

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

[0028]

As described above, the heavy corrosion-resistant steel pipe pile according to the present invention has the coating layer on the pipe head through the release layer, and the steel pipe pile is driven into the submarine ground. Immediately before building a 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 the concrete for the footing foundation is constructed. It is possible to remove deposits such as barnacles and seaweed attached to the coating layer from the pipe head together with the coating layer, and the removal work is significantly easier than the conventional deposit removal work. The efficiency of construction work is greatly improved and the manufacturing cost is reduced. Further, the pipe head of the steel pipe pile is covered with the coating layer from the time of driving the steel pipe pile to the water bottom ground to the construction of the concrete for the footing foundation. Unlike the conventional method, no deposits are attached to the surface. Therefore, the quality of the steel pipe surface is improved, and after welding the reinforcement to the pipe head, concrete of the footing foundation is constructed through this reinforcement, the quality and strength of the pipe head are improved and higher It has the effect of building a quality footing foundation.

[Brief description of drawings]

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

FIG. 2 is an enlarged vertical cross-sectional view of a heavy anticorrosion portion of the steel pipe pile shown in FIG.

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

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 corrosion-resistant steel pipe pile according to a second embodiment of the present invention.

FIG. 6 is an enlarged vertical cross-sectional view of a heavy anticorrosion portion of the upper portion of the steel pipe pile of FIG.

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 a side view showing a state in which the heavy anticorrosion steel pipe pile of the present invention is driven into the water bottom ground.

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

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

FIG. 12 is a side cross-sectional explanatory view showing a state in which footing foundation concrete is placed on the pipe head of the heavy corrosion-resistant steel pipe pile of FIG.

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

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

FIG. 15 is a partial transverse cross-sectional view of a steel pipe sheet pile formed by engaging opposing joint portions.

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

17 is a cross-sectional view taken along the line CC of FIG.

FIG. 18 is a side view showing a state in which a conventional heavy-corrosion-proof steel pipe pile is driven into the water bottom ground.

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

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

FIG. 21 is a flow chart showing a process for producing a heavy corrosion-resistant steel pipe pile by coating with a conventional polyurethane spray coating.

[Explanation of symbols]

 1 Water Bottom Ground 2 Rubble Layer 3 Steel Pipe Pile 4 Splash Zone 5 Tidal Zone 6 Steel Pipe Top 7 Cover Layer 8 Pipe Head 10 Footing Foundation 11 Release Coating Application Layer 12 Adhesive 13 Steel Pipe Pile 14 Polyethylene Sheet 15 Notch 16 Steel Pipe Top 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 body 25 Pipe joint 26 T-shaped joint 27 Top end 28 Pipe head

Claims (4)

[Claims] 1. A steel pipe pile driven into a submerged ground,
A release layer is provided on the steel pipe surface of the pipe head, and a non-release layer is provided on the steel pipe surface of other parts.A polyethylene sheet is attached to the steel pipe surface or polyurethane is blown across the release layer and the non-release layer. A heavy corrosion-resistant steel pipe pile, characterized in that a coating layer made of additional coating is provided, and means for displaying a boundary between the release layer and the non-release layer is provided on the coating layer. 2. A steel pipe pile driven into a submerged ground is subjected to blast treatment and primer treatment, a release layer is provided on the steel pipe surface of the pipe head, and a non-release layer is provided on the steel pipe surface of other parts. As an adhesive, a polyethylene sheet is continuously attached to the surface of the steel pipe straddling the release layer and the non-release layer, and the polyethylene is located at the boundary between the release layer and the non-release layer. A method for manufacturing a heavy corrosion-resistant steel pipe pile, characterized in that a boundary display means is provided on the sheet, and the polyethylene sheet covering the pipe head is provided so as to be separable from the steel pipe surface by using the boundary display means as a separation line. 3. A steel pipe surface of a pipe head other than the pipe head, after a blasting treatment and a primer treatment on the surface of the steel pipe pile to be driven into the water bottom ground, a release layer on the steel pipe surface of the pipe head. A non-releasing layer is provided on the steel pipe, polyurethane is sprayed on the surface of the steel pipe straddling the releasing layer and the non-releasing layer, and the polyurethane spray coating layer is located at the boundary between the releasing layer and the non-releasing layer. A method for manufacturing a heavy corrosion-resistant steel pipe pile, characterized in that a boundary display means is provided on the surface of the steel pipe so that the polyurethane covering the pipe head can be separated from the surface of the steel pipe by using the boundary display means as a separation line. 4. A release layer is provided on the surface of the steel pipe of the pipe head, and a non-release layer is provided on the surface of the steel pipe at other portions, and a polyethylene sheet is provided on the surface of the steel pipe across the release layer and the non-release layer. A steel pipe pile provided with means for displaying the boundary between the release layer and the non-release layer on the coating layer, the steel pipe pile comprising: The coating layer is driven into the subseabed so that the coating layer is located in the tidal zone and the splash zone in the water, and before the footing foundation is constructed, the coating layer that covers the pipe head is separated via the release layer, and the coating layer is released. A method of using a heavy corrosion-resistant steel pipe pile, characterized in that the footing foundation is constructed on the steel pipe surface of the pipe head.