JP6322057B2 - Rotary press-fit steel pipe pile connection fittings - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a rotary press-fit steel pipe pile connection fitting, and more specifically, supports a pedestal, which is a temporary mount for installing a tower crane for suspending building materials, on a rotary press-fit steel pipe pile that is rotated and penetrated into the ground. The present invention relates to a connection fitting of a rotary press-fit steel pipe pile for fixing.

  Conventionally, H-section steel is used for supporting piles used to support and fix pedestals for installation of tower cranes that suspend and convey various building materials by entering trucks for conveying materials at construction sites, etc. It was. For example, Patent Document 1 discloses a support tool for easily connecting and removing a support pile and a formwork, and H-shaped steel is used for the support pile (FIGS. 5 and 6 of Patent Document 1). reference). In the case of a supporting pile that fixes a pedestal where a tower crane is installed, it is firmly fixed in the ground by embedding H-shaped steel vertically and deeply into the ground and pouring a cementitious suspension around it. Was.

On the other hand, a rotary press-fit steel pipe pile as shown in FIG. 6 is known as one of the foundation piles. Rotation pressed steel pipe piles 100 shown is a steel pipe pile in which cross section is fitted with the blades 102 on the distal end side of the circular steel tube 101 (lower side), the rotation pressed steel pipe pile with all rotators, etc. In construction Rotate 100 into the ground. At that time, a propulsive force is exhibited by the wedge effect of the tip blade, and the rotary press-fit steel pipe pile 100 can be smoothly placed. The rotary press-fit steel pipe pile 100 can be used in a narrow place, can be gently screwed into the ground, and can be reliably placed on a hard ground with a blade at the tip. In addition, it has features such as no remaining soil. Examples of such rotary press-fit steel pipe piles 100 include “NS Ecopile” (registered trademark of Nippon Steel & Sumikin Engineering Co., Ltd.).

JP-A-7-197650

  In the case of a conventional support pile using H-shaped steel, even if the construction of the building was completed, it was fixed in the ground with cementitious suspension, so it could not be pulled out easily, and construction was completed in the past. It was left unattended without removing it later. Moreover, when H-section steel was used as a support pile, it was necessary to confirm in what direction the flange surface was placed.

On the other hand, if the rotary press-fit steel pipe pile is used as a support pile, the drawing after the completion of the work is easier than in the case of H-shaped steel, and even after drawing, it can be reused as a support pile again. Therefore, it is guessed that it contributes to cost reduction. Moreover, the construction method which considered the environment can be provided by not using cementitious suspension.

  However, since a rotary press-fit steel pipe pile with a circular cross-section that can be driven by rotary casting has never been used as a support pile, there was no such idea. No connection metal fittings have been provided for connecting H-shaped steels used for girders such as “lining work girders” and “transverse members”.

  Therefore, as a result of intensive investigations aimed at solving such conventional problems, the present inventor has completed the present invention relating to a new rotating press-fit steel pipe pile connection fitting. That is, the object of the present invention is to easily attach and detach the H-shaped steel, which is a girder constituting the pedestal, and the rotary press-fit steel pipe pile in order to use the rotary press-fit steel pipe pile that can be easily removed after the operation as a support pile. An object of the present invention is to provide a connection fitting for a rotary press-fit steel pipe pile that can be fixed to a pipe.

The present invention of claim 1 in order to solve the above problems, the digit material constituting the base, in fitting the rotary press fit steel pipe pile for connecting and fixing the rotary press fit steel pipe pile sectional plane substantially cylindrical shape, A mounting portion for mounting on the side surface of the rotary press-fit steel pipe pile, a pair of holding members having a support portion formed so as to extend from the mounting portion, and the support portions of the pair of holding members A pair of lower side fixing members formed in a length that can be supported from the side; an upper side fixing member that is disposed on an upper portion of the beam; and each of the upper side fixing member and the pair of lower side fixing members And a fastening bolt for fixing the rotating press-fit steel pipe pile to the girder member by sandwiching and holding the holding member through the girder member.

  In order to solve the above-mentioned problem, the present invention according to claim 2 is the connecting fitting of the rotary press-fit steel pipe pile according to claim 1, wherein the holding member includes a flat upper flange and a lower flange, A concave web having a shape conforming to the outer curved surface of the rotary press-fit steel pipe pile is arranged at a substantially intermediate position between the flange and the lower flange, and the concave web is provided with a plurality of bolt holes for inserting fixing bolts, A flat flat web is disposed on each of the left and right sides of the concave web, and ribs for reinforcement are provided at predetermined locations.

  In order to solve the above-mentioned problem, the present invention described in claim 3 is the connection fitting of the rotary press-fit steel pipe pile according to claim 1 or 2, wherein the upper side fixing member and / or the lower side fixing member has a cross section. Is a member having a substantially rectangular hollow portion.

  In order to solve the above-mentioned problem, the present invention described in claim 4 is the rotary fitting metal pipe pile connection fitting according to any one of claims 1 to 3, wherein the concave web of the holding member includes An outer reinforcing plate having a concave shape corresponding to the curved surface of the concave web is disposed, and a concave shape corresponding to the curved surface of the rotary press-fit steel pipe pile is disposed inside the rotary press-fit steel pipe pile at a position facing the outer reinforcing plate. An inner reinforcing plate having the above is arranged.

  In order to solve the above-mentioned problem, the present invention according to claim 5 is the connection fitting of the rotary press-fit steel pipe pile according to any one of claims 1 to 4, wherein the girder and the holding member are interposed. A buffer member is arranged.

  According to the connection fitting of the rotary press-fit steel pipe pile according to the present invention, since the rotary press-fit steel pipe pile can be used as a support pile for supporting and fixing the pedestal, it is possible to remove the rotary press-fit steel pipe pile after the work is finished. Become. Therefore, since the rotary press-fit steel pipe pile can be reused without leaving the support pile as in the conventional case, there is an effect that it is possible to reduce the cost for installing the base. In addition, by using a rotary press-fit steel pipe pile as the support pile, it becomes unnecessary to worry about the direction of the H-shaped steel at the time of placing as in the case of the conventional H-shaped steel. Furthermore, since the support pile is not fixed in the ground with the cementitious suspension, there is an effect that construction in consideration of the environment becomes possible.

It is a perspective view which shows one preferable embodiment of the connection fitting of the rotary press-fit steel pipe pile which concerns on this invention. It is a front view of the connection fitting of the rotary press-fit steel pipe pile shown in FIG. It is a perspective view which shows the detail of the connection metal fitting of a rotation press fit steel pipe pile. It is a top view which shows the attachment state of a rotation press-fit steel pipe pile and a holding member. It is explanatory drawing which shows the pile driving process of a rotary press-fit steel pipe pile. It is a perspective view which shows the structure of the principal part of a rotation press fit steel pipe pile.

[Structure of connecting fittings for rotary press-fit steel pipe piles]
A preferred embodiment of a connection fitting for a rotary press-fit steel pipe pile according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a preferred embodiment of a connection fitting of a rotary press-fit steel pipe pile according to the present invention, FIG. 2 is a front view of the connection fitting of the rotary press-fit steel pipe pile shown in FIG. 1, and FIG. It is a perspective view which shows the detail of a connection metal fitting. First, as shown in FIGS. 1 to 3, the girders constituting the pedestal (not shown) are formed so that the H-section steels 10 </ b> A and 10 </ b> B intersect with the cross shape. A mast 30 that is a pillar material that supports a tower crane (not shown) is erected at the intersection. The mast 30 is firmly fixed to the H-shaped steels 10A and 10B by the holder 40.

  Now, as shown in FIG. 1, the connection fitting 1 of a rotary press-fit steel pipe pile is attached to each of four places near the four end portions of the cross-shaped H-section steels 10A and 10B constituting the girders. Then, as shown in FIG. 2, the rotary fitting metal pipe pile connection fitting 1 is generally arranged below the H-section steels 10A and 10B and detachably holds the rotary fitting steel pipe pile 20 from both sides in the lateral direction. A pair of holding members 32, 32 made of metal such as steel and a pair of lower members arranged on the lower side of the holding members 32, 32 attached to face the side surface of the rotary press-fit steel pipe pile 20. The side fixing members 31, 31, the upper side fixing member 6 disposed on the upper side of the H-shaped steels 10 A and 10 B, and the upper side fixing member 6 and the lower side fixing members 31, 31 are connected and fixed to each other. It comprises clamping bolts 4a and 4b that clamp the holding member 32 via the section steels 10A and 10B and fix the rotary press-fit steel pipe pile 20 to the H-section steels 10A and 10B.

  The holding member 32 is provided with a flat upper flange 32a and a lower flange 32b. As shown in FIG. 2, the holding member 32 is a semi-finished steel tube pile 20 that is approximately halfway between the upper flange 32a and the lower flange 32b. A circular concave web 32c is arranged. Moreover, the concave web 32c is provided with a plurality of bolt holes through which two fixing bolts 2a to 2c for fixing to the side surface of the rotary press-fit steel pipe pile 20 are inserted. The concave web 32 c serves as an attachment portion for attaching the holding member 32 to the rotary press-fit steel pipe pile 20. A hole for inserting the fixing bolts 2a to 2c is formed in a predetermined position on the upper side of the rotary press-fit steel pipe pile 20. The left and right sides of the concave web 32c are formed so as to extend outward, and flat plate-like webs 32d and 32d are respectively disposed. This portion becomes a support portion that is supported and fixed by lower-side fixing members 31 and 31 described later. Further, ribs 32e and 32e for reinforcement are provided at a plurality of locations between the upper flange 32a and the lower flange 32b. And the holding members 32 and 32 are attached so that it may oppose the side surface of the rotary press-fit steel pipe pile 20 as a pair as shown in FIG.

  An outer reinforcing plate 36 having a concave shape corresponding to the curved surface of the concave web 32c is disposed on the concave web 32c of the holding member 32, and on the inner side of the rotary press-fit steel pipe pile 20 at a position facing the outer reinforcing plate 36. An inner reinforcing plate 35 having a concave shape conforming to the curved surface of the rotary press-fit steel pipe pile 20 is disposed. And the holding members 32 and 32 are firmly fixed by the three fixing bolts 2a to 2c arranged in the upper and lower two stages on the side surface of the rotary press-fit steel pipe pile 20 with the inner reinforcing plate 35 and the outer reinforcing plate 36 interposed therebetween. It is attached. Further, a buffer member 34 is disposed between the lower surfaces of the H-shaped steels 10A and 10B and the upper surfaces of the holding members 32 and 32 so as to be fixed without rattling.

  The lower side fixing members 31, 31 are members for supporting the support portions of the pair of holding members 32, 32 from below, and are attached to face the side surface of the rotary press-fit steel pipe pile 20. The cross section formed to a length capable of supporting the support portions of the pair of holding members 32, 32 from below is formed of a member having a substantially square hollow portion, for example, a square tube member. A hole for inserting long fastening bolts 4a and 4b, which will be described later, is formed in the approximate center of the lower fixing member 31. In the present embodiment, the lower-side fixing member 31 is a square tube member in order to ensure strength. However, the present invention is not limited to this, and a flat metal plate can also be used.

  Similar to the lower side fixing member 31, the upper side fixing member 6 is formed of a member having a hollow portion having a substantially square cross section, for example, a rectangular tube member, and has a long length described later at a predetermined location near the left and right ends. Are provided with holes for inserting the fastening bolts 4a and 4b. In the present embodiment, the upper side fixing member 6 is a square tube member for securing the strength, similarly to the lower side fixing member 31. However, the present invention is not limited to this, and is not limited to this. Plates can also be used. The upper side fixing member 6 is disposed on the upper side so as to be orthogonal to the H-section steels 10A and 10B.

  The fastening bolts 4 a and 4 b are long bolt members for connecting and fixing the upper side fixing member 6 and the lower side fixing member 31. By fixing the upper side fixing member 6 and the lower side fixing member 31 to the H-section steels 10A and 10B with the fastening bolts 4a and 4b, the H-section steels 10A and 10B which are girders are firmly fixed to the rotary press-fit steel pipe pile 20. Is done. The nuts 5a to 5d for fixing the fastening bolts 4a and 4b are fixed by two nuts so as not to loosen.

[How to use the fittings for rotating press-fit steel pipe piles]
Next, the usage method of the connection fitting of the rotary press-fit steel pipe pile mentioned above is demonstrated. First, the configuration of a pile driving machine 50 for driving the rotary press-fit steel pipe pile 20 will be described. FIG. 5 is an explanatory diagram showing the configuration of the pile driving machine 50 and the pile driving process. As shown in FIG. 5, the pile driver 50 includes a vehicle body 51 having a driver's cab, a leader 52 that can stand up from the vehicle body 51, a stay 53 that supports the leader 52, and a descender from the top of the leader 52. A motor 54 that penetrates the first rotary press-fit steel pipe pile 20a into the ground and a steady rest 55 that holds the lower end of the rotary press-fit steel pipe pile 20a and prevents the rotary press-fit steel pipe pile 20 from swinging are configured. Yes.

Next, placement of the rotary press-fit steel pipe pile 20 by the pile driving machine 50 will be described. First, the pile driving machine 50 is carried into a construction site for a tower crane (not shown). 5A, the upper end of the first rotary press-fit steel pipe pile 20a is attached to the motor 54 of the pile driving machine 50, and the lower end of the rotary press-fit steel pipe pile 20a is inserted into the steady rest 55. Next, the motor 54 is driven to lower the rotary press-fit steel pipe pile 20a while rotating, and the rotary press-fit steel pipe pile 20a is gradually lowered while screwing the blade 102 into the ground in the process. As shown in FIG. 5 (b), it stops the driving of the motor 54 when the motor 54 is lowered to a near surface. If necessary, the upper end of the second rotary press-fit steel pipe pile 20b is attached to the motor 54, and the lower end of the rotary press-fit steel pipe pile 20b is connected to the upper end of the first rotary press-fit steel pipe pile 20a by welding. Thereafter, the rotary press-fit steel pipe pile 20b is press-fitted in the same manner as the press-fit steel rotary pipe pile 20a. This state is shown in FIG. Hereinafter, similarly, the rotary press-fit steel pipe pile 20 is driven at predetermined positions corresponding to the H-section steels 10A and 10B which are girders.

  Next, the attachment procedure of the connection fitting 1 of a rotary press-fit steel pipe pile will be described with reference to FIG. 1 to 4 with respect to four rotary press-fit steel pipe piles 20 and 20 placed at predetermined positions (four locations in the present embodiment) corresponding to H-beams 10A and 10B which are pedestal beams not shown. As shown in Fig. 2, the rotary press-fit steel pipe pile connection fitting 1 is attached to the upper end of the rotary press-fit steel pipe pile 20. Specifically, the concave web 32c of the holding members 32, 32 is brought into contact with the side surface on the upper end side of the rotary press-fit steel pipe pile 20 and fixed by the fixing bolts 2a to 2c. In the same manner, the other holding member 32 is attached to the opposite position. This is executed for four locations of the H-section steels 10A and 10B. At this time, the buffer member 34 is interposed between the holding members 32 and 32 and the lower surface of the H-shaped steel 10A (or 10B).

  Next, the upper side fixing member 6 is arranged at a predetermined position on the upper surface of the H-shaped steel 10A (or 10B), and the pair of lower side fixing members 31, 31 are arranged at predetermined positions below the holding members 32, 32, The holes for inserting the fastening bolts 4a and 4b provided in the upper-side fixing member 6 and the lower-side fixing members 31 and 31 are respectively matched, and the fastening bolts 4a and 4b are passed through the holes. At this time, nuts 5c and 5d may be attached to the upper ends of the fastening bolts 4a and 4b in advance. Then, the fastening bolts 4a and 4b are inserted into the holes of the upper side fixing member 6 and the lower side fixing members 31 and 31, and then the nuts 5a and 5b are screwed into the lower side of the fastening bolts 4a and 4b. And the lower side fixing members 31 and 31 are horizontal, and the nuts 5a and 5b are fastened so that the entire lower surface is in close contact with the upper surface of the H-shaped steel 10A (or 10B). The lower side fixing members 31, 31 are firmly fixed to the H-section steels 10A, 10B. By performing this for four locations, the attachment of the connection fitting 1 of the rotary press-fit steel pipe pile is completed. Finally, the lower end of the mast 30 that supports a tower crane (not shown) is inserted and fixed to the holders 40 of the H-section steels 10A and 10B.

  After the construction work is completed and the tower crane and mast 30 (not shown) are removed, the nuts 5a to 5d are loosened, and the upper fixing member 3 and the pair of lower fixing members 31, 31 are removed from the H-section steels 10A, 10B. Next, the fixing bolts 2 a to 2 c are loosened and the holding members 32, 32 are removed from the rotary press-fit steel pipe pile 20. When the connection fitting 1 of the rotary press-fit steel pipe pile is removed, the rotary press-fit steel pipe pile 20 is pulled out by rotating the rotary press-fit steel pipe pile 20 in the direction opposite to the driving direction by the pile driving machine 50. Then, the extracted rotary press-fit steel pipe pile 20 and the connection fitting 1 of the rotary press-fit steel pipe pile are transported to another construction site, and the above-described placing process and recovery process are repeated.

Moreover, the procedure shown below can also be used as another attachment method of the connection fitting 1 of the rotary press-fit steel pipe pile different from the above-mentioned procedure. The four rotary press fit steel pipe pile 20 Da設a predetermined location, Ru attaching a pair of holding members 32, 32. Then , the lower side fixing members 31, 31 are arranged on the lower end side of the tightening bolts 4a, 4b, and the upper side fixing member 6 is arranged on the upper end side, and are temporarily fixed by the nuts 5a-5d. Then, the upper side fixing member 6 is arranged on the upper surface of the H-section steel 10A (or 10B), and the pair of lower side fixing members 31, 31 are arranged below the holding members 32, 32. Then, by fastening the nuts 5a to 5d, the upper side fixing member 3 and the pair of lower side fixing members 31, 31 are firmly fixed to the H-section steels 10A, 10B. By performing this for four locations, the attachment of the connection fitting 1 of the rotary press-fit steel pipe pile is completed. Finally, the lower end of the mast 30 that supports a tower crane (not shown) is inserted and fixed to the holders 40 of the H-section steels 10A and 10B.

  As described above, the preferred embodiment of the present invention has been described in detail. However, the present invention is not limited to the specific embodiment, and within the scope of the gist of the present invention described in the claims, Needless to say, various modifications and changes are possible.

1 rotary press fit steel pipe connection fitting 2a~2f fixing bolts 4a, 4b clamping bolt 5a~5d nut 6 upper side fixing member 10A, 10B H-section steel 20, 20a, 20b rotate pressed steel pipe 30 the mast 31 the lower side fixing member 32 Holding member 32a Upper flange 32b Lower flange 32c Concave web 32d Flat web 32e Rib 34 Buffer member 35 Inner reinforcing plate 36 Outer reinforcing plate 40 Holder 50 Pile driver 102 Blade

Claims (5)

The digit material constituting the base, in fitting the rotary press fit steel pipe pile for connecting and fixing the rotary press fit steel pipe pile sectional plane substantially cylindrical shape,
A pair of holding members having a mounting portion for mounting on a side surface of the rotary press-fit steel pipe pile, and a support portion formed so as to extend from the mounting portion;
A pair of lower-side fixing members formed to a length capable of supporting the support portions of the pair of holding members from below;
An upper side fixing member disposed on the upper part of the girder;
A clamping bolt for fixing the rotating press-fit steel pipe pile to the girder member by clamping the holding member via the girder member by connecting and fixing the upper side fixing member and each of the pair of lower side fixing members; ,
The connection fitting of the rotary press-fit steel pipe pile characterized by comprising. In the connection fitting of the rotary press-fit steel pipe pile according to claim 1,
The holding member is
With flat upper flange and lower flange,
A concave web having a shape conforming to the outer curved surface of the rotary press-fit steel pipe pile is disposed at a substantially intermediate position between the upper flange and the lower flange, and the concave web is provided with a plurality of bolt holes for inserting fixing bolts. A connecting member for rotary press-fit steel pipe piles, in which flat plate-like webs are respectively arranged on the left and right sides of the concave web, and further, ribs for reinforcement are provided at predetermined locations. In the connection fitting of the rotary press-fit steel pipe pile according to claim 1 or 2,
The upper-side fixing member and / or the lower-side fixing member is a member having a hollow portion having a substantially square cross section. In the connection fitting of the rotary press-fit steel pipe pile according to any one of claims 1 to 3,
The concave web of the holding member is provided with an outer reinforcing plate having a concave shape corresponding to the curved surface of the concave web, and on the inner side of the rotary press-fit steel pipe pile at a position facing the outer reinforcing plate. A connection metal fitting for a rotary press-fit steel pipe pile, characterized in that an inner reinforcing plate having a concave shape conforming to the curved surface of the rotary press-fit steel pipe pile is arranged. In the connection fitting of the rotary press-fit steel pipe pile according to any one of claims 1 to 4,
A connection fitting for a rotary press-fit steel pipe pile, wherein a buffer member is disposed between the girder and the holding member.

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