JP4020920B2 - Pipe pile groove protector - Google Patents

Description

  The present invention relates to a groove protector that prevents a groove portion of a pipe pile from being damaged when the pipe pile is suspended by a crane.

  As measures against soft ground where landslides are likely to occur, reinforcement work is being carried out to improve the strength of the ground by burying anchors and the like. One of them is the construction of embedding steel pipe piles. Steel pipe piles are characterized by high driving penetration force, reliable construction of joints, and strong bending resistance against horizontal loads, and are used for deep foundations. The steel pipe pile is manufactured by rolling a steel plate, winding it in a spiral shape, and welding its seam. In order to connect the steel pipes produced by rolling the steel plates in the length direction by welding, the end faces of the steel pipes that abut each other are subjected to groove processing. The shape of the groove formed by beveling the end face of the steel pipe can be I-shaped, V-shaped, X-shaped, K-shaped, U-shaped, etc. is there.

  Steel pipe piles used for the above-mentioned reinforcement work have large diameters and weights, so they can be lifted using a crane and connected to a boring machine, placed on a trailer, or moved to another position. Lay on the ground. In addition, if the strength is insufficient as a result of measuring the ground strength at the construction site, it is welded at the site and lengthened as necessary. When lifting up using a crane or the like, the groove part comes into contact with the ground, and the steel pipe pile has its own weight on the groove part. Thereby, the problem that a groove part was damaged has arisen.

  It is not intended to protect the groove part, but when lifting a pre-made pile, it often moves while dragging the lower end on the ground, causing problems such as damage to the pile end plate and concrete part. In order to solve the problem, a protective socket for detachably protecting the lower end portion of the ready-made pile has been proposed (see Patent Document 1). This protective socket is characterized in that a cylindrical main body having an inner diameter capable of covering the lower end portion of the ready-made pile is provided with attaching / detaching means that enables attachment to and removal from the ready-made pile.

The protective socket is often moved while dragging on the ground, and is provided to prevent damage to the pile end plate and concrete part. It is supposed to be a structure. If this protective socket is used for groove protection, the cylindrical body that covers the ready-made pile made of large-diameter pipes costs material, cannot be easily transported, and after hanging up, There is a problem that the sharp-cut portion cannot be easily removed. Particularly, the sharp-cut portion has a problem that the sharp-cut portion abuts on the cylindrical main body and is broken due to lifting.
JP 2004-003303 A

  In view of the above problems, the present invention provides a groove protector that prevents a groove portion from being damaged when lifted by a crane, can be easily removed, can be provided at low cost, and can be easily transported. The purpose is to do.

According to the present invention, it is a groove protector for preventing breakage of the groove portion formed on the end face of the pipe pile when the pipe pile is suspended,
A lower end support part for supporting the lower end of the pipe pile when the pipe pile is laid down; and a first end face support part for supporting the pipe pile when suspended by a part of the end face, A first protective member attached adjacent to a pipe wall at the lower end of the pipe pile and an end face continuous with the pipe wall;
The groove portion is interposed between the first end surface support portion and a second end surface support portion that supports the pipe pile when suspended is supported together with the first end surface support portion. A second protective member, which is adjacent to a tube wall and an end surface continuous with the tube wall, and is attached to face the first protective member;
A groove having a length that protrudes from the end face in the length direction of the pipe pile is smaller than a thickness of the first end face support part and a thickness of the second end face support part. Protective equipment is provided.

  Further, according to the present invention, the lower end support portion is attached between a bent plate having a tube wall adjacent surface having a constant curvature, a bottom plate, and the bent plate and the bottom plate, so that the bent plate is deformed. There is provided a groove protector comprising a reinforcing plate to prevent.

  According to the present invention, the groove portion is formed on the inner diameter side of the end surface of the pipe pile, and the first end surface support portion and the second end surface support portion are adjacent to the outer diameter side of the end surface. A bevel protector is provided that can be attached to.

  According to the present invention, there is provided a groove protector in which the bent plate covers 1/4 to 5/12 of the circumference of the tube wall and suppresses the rotation of the laid pile pile.

  By providing the groove protector of the present invention, the pipe pile can be hung without damaging the groove portion. Moreover, after hanging up, it can be easily removed by sliding in the horizontal direction without lifting the pipe pile greatly, and it is compact and easy to carry.

  The present invention will be described in detail with reference to the drawings, but the groove protector of the present invention is not limited to the embodiment shown in the drawings. Before describing the groove protector of the present invention, a pipe pile will be described. FIG. 1 is a cross-sectional view illustrating a steel pipe pile. As described above, the pipe pile 10 has characteristics that the driving penetration force is large, the construction of the joint is reliable, and the bending resistance against the horizontal load is strong, and is used for a deep foundation. The pipe pile 10 is manufactured by rolling a steel plate or winding it in a spiral shape, and welding a seam to manufacture a steel pipe, and welding and connecting the steel pipe in the length direction. In each steel pipe, the end face 11 of each steel pipe that abuts the steel pipes is grooved for welding. The shape of the groove portion 12 formed by groove processing the end face 11 of the steel pipe depends on the shape of the groove when the two steel pipes to be welded are brought into contact with each other, and is in the form of I, V, X, K, U and so on. The shape of the groove portion 12 is most suitable for the thickness of the metal in order to completely weld the metal on the joint surface.

  In the pipe pile 10 shown in FIG. 1, the groove portion 12 is formed on the inner diameter side of the end face 11 of the pipe pile 10, and projects from the end face 11 in the length direction of the pipe pile 10 to be sharp. Further, the groove portion 12 is formed around the inner diameter side. The end surface 11 on the outer diameter side excluding the groove portion 12 is flat. Therefore, when the pipe pile 10 is hung as it is, the sharpened groove portion 12 hits the ground and is deformed or cracked and broken. This breakage causes incomplete metal welding on the end surface 11 which is a joint surface, reduces the driving penetration force, and decreases the bending resistance against the horizontal load. For this reason, it is necessary to hang up so that the groove part 12 may not be damaged, and the groove protector of this invention is employ | adopted.

  FIG. 2 is a diagram illustrating a groove protector according to the present invention. The groove protector shown in FIG. 2 includes a first protective member 20 shown in FIG. 2A and a second protective member 30 shown in FIG. The first protective member 20 shown in FIG. 2 (a) includes a lower end support portion 21 that supports the lower end of the pipe pile when the pipe pile is laid down, and a pipe pile when the pipe pile is suspended. And a first end surface support portion 22 to be supported. The 1st protection member 20 is attached adjacent to the pipe wall of a pipe pile lower end, and the end surface which continues to the pipe wall.

  In the embodiment shown in FIG. 2 (a), the lower end support portion 21 is substantially the same as the pipe wall of the pipe pile, when the bent plate 24 having the pipe wall adjacent surface 23 having a constant curvature and the pipe pile are laid down. The bottom plate 25 is adjacent to the ground and supports the bent plate 24, and the reinforcing plate 26 is attached between the bent plate 24 and the bottom plate 25 and prevents the bent plate 24 from being deformed. The bent plate 24 covers 1/4 to 5/12 of the circumference of the pipe wall, that is, if the circumference of the pipe wall is 360 °, covers the portion of 90 ° to 150 ° and suppresses the rotation of the laid pipe pile. , Prevent falling to the ground. Even if it is smaller than ¼, the pipe pile can be supported, but it is easy to rotate and fall from the bent plate 24 easily. When it is larger than 5/12, it can be supported or the rotation can be suppressed, but when the pipe pile is suspended and the first protective member 20 is removed, it is difficult to remove it by moving it horizontally. From these, it is preferable that the size covers the above range.

  The bottom plate 25 can support the lower end of the pipe pile and the bent plate 24, and has a size such that the lower end support portion 21 on which the pipe pile is placed cannot easily fall down. The reinforcing plate 26 is provided so that the bent plate 24 is not deformed or damaged by a load applied to the bent plate 24. The reinforcing plate 26 is attached perpendicularly to the back surface of the bent plate 24 having a constant curvature, and a plurality of reinforcing plates 26 are provided at predetermined intervals. In the embodiment shown in FIG. 2A, a total of eight reinforcing plates 26 are provided, and four reinforcing plates 26 are provided on the back side.

  The 1st end surface support part 22 is connected with the baseplate 25 and the bending board 24 of the lower end support part 21, and is provided with the end surface adjacent surface which is not shown in figure which adjoins a part of end surface of a pipe pile. Further, the first end surface support portion 22 supports a pipe pile suspended together with a second end surface support portion described later, and the thickness thereof is prevented so that the projecting groove portion hits the ground and is not damaged. The protrusion length of the groove is larger. For example, if the protruding length of the groove portion is about 2 to 3 mm, the thickness is about 20 to about 50 mm. The groove protector of the present invention is made of a material such as styrene resin, acrylic resin, polypropylene, polyvinyl chloride, polyethylene, tetrafluoroethylene resin, wood, rubber, etc. so as not to damage the pipe pile itself. Can be used. These materials dig into the pipe pile due to the weight of the pipe pile, or dig into the ground together with the groove protector due to the weight of the pipe pile. For this reason, compared with protrusion length, the thickness of the 1st end surface support part 22 and the 2nd end surface support part mentioned later is made into sufficient thickness as mentioned above. In addition, the thickness of the 1st end surface support part 22 and the 2nd end surface support part is made into the same thickness. The 1st end surface support part 22 may be any magnitude | size as long as it can support the suspended pipe pile with the 2nd end surface support part mentioned later.

  The second protective member 30 shown in FIG. 2 (b) has a groove portion interposed between the first end surface support portion 22 and a pipe pile that is suspended and supports the pipe pile together with the first end surface support portion 22. Two end face support portions 31 are provided. The second protective member 30 is attached adjacent to the pipe wall of the pipe pile and an end face continuous with the pipe wall and facing the first protective member 20.

  The second protection member 30 also includes a bent plate 32 similar to the first protection member 20 and covers a part of the tube wall. This is because, in the case of a pipe pile that is laid down, when the second protective member 30 is mounted on the lower end of the pipe pile, the pipe pile cannot be placed without the bent plate 32. If the pipe pile is not lifted unless it is a bent plate 32, the pipe wall of the pipe pile is easily slid down, and the pipe pile suspended at the second end face support part 31 is moved to the first end face support part 22. It is because it becomes impossible to support with it. When the pipe pile is hung up, the second protection member 30 provided with the bent plate 32 has the second end face support portion 31 disposed on the ground while maintaining the state attached to the lower end of the pipe pile, and the first end face. The pipe pile can be supported together with the support portion 22.

  The groove protector of the present invention is adjacent to the pipe wall and the end face, and particularly does not use mounting brackets or adhesives. Therefore, when hanging the pipe pile and removing the groove protector, It can be easily removed by simply moving it horizontally.

  The groove protector of the present invention will be described in more detail with reference to FIGS. 3 is a front view, FIG. 4 is a right side view, and FIG. 5 is a cross-sectional view taken along a cutting line AA. 3 to 5, the solid line represents the groove protector of the present invention, and the broken line represents a pipe pile. The groove protectors 27 and 33 are provided so that the groove protectors shown in FIGS. 3 to 5 can be suspended by a crane or the like. The suspension fittings 27 and 33 are provided with holes in a flat plate, and are provided in the predetermined positions of the bending plates 24 and 32 as many as necessary for suspension. 3, the pipe pile 10 is laid sideways, the first protection member 20 is disposed below the lower end of the pipe pile, and the second protection member 30 is placed above the pipe pile 10. By placing the first protective member 20 and hanging the pipe pile with a crane or the like, the lower end of the pipe pile can be placed on the first protective member 20 as shown in FIG. In this case, the first protective member 20 is disposed with the tube wall adjacent surface 23 adjacent to the tube wall 13 at the lower end of the tube pile and the first end surface support portion 22 adjacent to the end surface 11. In addition, the upper end of the pipe pile 10 is arrange | positioned on the ground using the top of the ground or a square.

  The second protection member 30 is placed on the lower end of the pipe pile placed on the first protection member 20. In this case, the second protective member 30 is disposed with the tube wall adjacent surface of the bent plate 32 of the second protective member 30 adjacent to the tube wall 13 and the second end surface support portion 31 adjacent to the end surface 11. .

  The length L of the first protection member 20 and the second protection member 30 in the length direction of the pipe pile 10 is 0.3 m to 1 m when the outer diameter D of the pipe pile 10 is 1.2 m. Can do. If it is too short, it will be easy to come off, and if it is too long, the material cost will be high, the weight will increase, and it will not be easy to remove when hanging up and removing. Therefore, it is preferable to set the length L within the above range. Moreover, although thickness a of the 1st end surface support part 22 and the 2nd end surface support part 31 is based on the length of the groove part which protrudes, if it is the length of the groove part mentioned above, it will be 20 mm mentioned above. It can be 50 mm.

  In the right side view shown in FIG. 4, the groove portion 12 is formed on the inner diameter side of the end surface 11 of the pipe pile 10, and the first end surface support portion 22 and the second end surface support portion 31 are on the outer diameter side of the end surface 11. It is shown attached adjacent to. Moreover, the 1st protection member 20 and the 2nd protection member 30 are arrange | positioned so that the pipe pile 10 may be opposed. The bent plate 24 of the first protective member 20 covers about 1/3 of the entire circumference of the tube wall, that is, the tube wall portion having a central angle α of about 120 °, and the first end surface support portion 22 is located outside the end surface 11. Only a portion where the diameter side is about 1/4, that is, the central angle β is about 90 ° is supported.

  The bent plate of the second protective member 30 covers about 1/6 of the circumference of the tube wall, that is, the tube wall portion having a central angle γ of about 60 °, and the second end surface support portion 31 has an outer diameter of the end surface 11. Only about 60 ° of the side is supported. In the embodiment shown in FIG. 4, the first end surface support portion 22 and the second end surface support portion 31 are formed so as to be adjacent to the outer diameter side of the end surface 11 of about 40 mm. In the groove protector provided with the first end surface support portion 22 and the second end surface support portion 31 formed so as to be adjacent to the outer diameter side of about 40 mm, the thickness of the pipe pile 10 is about 50 mm to about 100 mm. It is possible to deal with. When the width is less than 50 mm, the groove portion 12 is in contact with the first end surface support portion 22 and the second end surface support portion 31, and the groove portion 12 is indented or pierced. This is because there is a risk of breakage, such as breaking 12. In addition, when it exceeds 100 mm, it cannot be placed on the first end surface support portion 22 and the second end surface support portion 31 having a support width of about 40 mm, and the groove portion 12 may come into contact with the ground and be damaged. Because.

  The cross-sectional view shown in FIG. 5 shows that the pipe pile 10 is placed on the bent plate 24 of the first protective member 20 and is restrained from rotating. Since the pipe pile 10 has a circular cross section, it rolls when the ground is inclined or when it is hung from a crane. Further, when the bent plate 24 covers only about 1/6 of the circumference of the tube wall, that is, only the tube wall portion where the central angle α shown in FIG. 4 is 60 °, the tube pile 10 is sufficiently placed. If there is any vibration or contact, it may fall to the ground. For this reason, it is set as the bending board 24 of the magnitude | size which can mount the pipe pile 10 fully, the reinforcement board 26 which prevents the deformation | transformation of the bending board 24, and supports the bottom board 25. In the embodiment shown in FIG. 5, the bent plate 24 is not directly supported by the bottom plate 25 but is supported via the reinforcing plate 26. The second protection member 30 has a second end surface support portion 31 that can support the pipe pile 10 suspended together with the first end surface support portion 22, and a bending that does not slip off from the tube wall when hanging up. Since it is only necessary to include the plate 32, the size is smaller than that of the first protection member 30. Specifically, the bent plate 24 of the first protective member 20 covers about 1/4, whereas the bent plate 32 of the second protective member 30 covers about 1/6. Yes.

  Although the present invention has been described in detail so far with reference to the drawings, the groove protector of the present invention has an appropriate size depending on the shape, position, diameter, and thickness of the pipe pile. , A bent plate having a length, a first end surface support portion, a second end surface support portion, and a bottom plate, and a required number of reinforcing plates.

The figure which illustrated the pipe pile. The figure which showed the groove protector of this invention. The front view of the groove protector of this invention. The right view of the groove protector of this invention. Sectional drawing cut | disconnected by cutting line AA.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Pipe pile 11 ... End surface 12 ... Groove part 13 ... Pipe wall 20 ... 1st protection member 21 ... Lower end support part 22 ... 1st end surface support part 23 ... Pipe wall adjacent surface 24 ... Curved plate 25 ... Bottom plate 26 ... Reinforcement Plate 27 ... Hanging bracket 30 ... Second protective member 31 ... Second end face support 32 ... Bending plate 33 ... Hanging bracket

Claims (4)

A groove protector for preventing breakage of the groove formed on the end face of the pipe pile when the pipe pile is hung up,
A lower end support part for supporting the lower end of the pipe pile when the pipe pile is laid down; and a first end face support part for supporting the pipe pile when suspended by a part of the end face, A first protective member attached adjacent to a pipe wall at the lower end of the pipe pile and an end face continuous with the pipe wall;
The groove portion is interposed between the first end surface support portion and a second end surface support portion that supports the pipe pile when suspended is supported together with the first end surface support portion. A second protective member, which is adjacent to a tube wall and an end surface continuous with the tube wall, and is attached to face the first protective member;
A groove having a length that protrudes from the end face in the length direction of the pipe pile is smaller than a thickness of the first end face support part and a thickness of the second end face support part. Protective equipment.   The lower end support part is attached between a bent plate having a tube wall adjacent surface having a constant curvature, a bottom plate supporting the bent plate, and the bent plate and the bottom plate, and prevents deformation of the bent plate. The groove protector according to claim 1, comprising a reinforcing plate.   The groove portion is formed on an inner diameter side of an end surface of the pipe pile, and the first end surface support portion and the second end surface support portion are attached adjacent to an outer diameter side of the end surface. The groove protector according to 1 or 2. The bevel protector according to claim 2 , wherein the bent plate covers ¼ to 5/12 of the circumference of the pipe wall and prevents rotation of the laid pipe pile.

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