JP5616625B2 - SC pile and its manufacturing method - Google Patents

Description

  The present invention relates to an SC pile used as an upper pile in construction and civil engineering pile foundation work, and a method for manufacturing the same, and in particular, anchor reinforcing bars for joining with a footing are arranged in the pile body of the pile head. The present invention relates to an SC pile end plate provided with a plurality of support pipes for supporting anchor reinforcing bars that can be used for the SC pile.

  Conventionally, when constructing a structure such as a building, a pile foundation method has been used in which a foundation pile is provided up to the depth of the ground support layer and the foundation of the structure is formed on the pile head of this foundation pile. The foundation part (footing) of the structure is joined and integrated with the top pile head of the foundation pile on the foundation pile constructed by foundation pile construction.

  In such a pile foundation structure, the upper pile head in the foundation pile and the foundation part of the structure formed on it are joined together, so that if an earthquake occurs, for example, the upper structure A large bending moment and shear force are generated near the top of the upper pile pile due to the horizontal force and rotational force transmitted from the head. Therefore, various methods for resisting these bending moments and shearing forces have been considered, and one of them is a method of using SC piles for the upper piles.

  The SC pile is also called a concrete pile with a shell steel pipe, and is a hollow concrete pile formed by integrally molding expanded concrete in a cylindrical shape on the inner surface of the steel pipe, and has very large toughness because the expanded concrete is restrained by the steel pipe Is.

  As described above, the SC pile is used as the upper pile in the foundation pile and is joined to the foundation portion (footing) of the structure. Therefore, in the SC pile, there are various methods in which the joining is strong and the construction is as simple as possible. It is being considered.

  Under such circumstances, an SC pile is known in which anchor reinforcing bars to be joined to the footing are embedded in the pile body of the pile head in advance. For example, Patent Document 1 states that “a steel pipe, a concrete cylinder placed on the inner peripheral surface of the steel pipe, a plurality of anchor reinforcing bars embedded in the concrete cylinder and the concrete cylinder in the axial direction. "SC pile consisting of" is disclosed.

  Patent Document 2 states that “a concrete pile head joint is formed on one end side and a steel pipe concrete composite part is formed from the other end to the other end, and the pile head joint part extends over the steel pipe concrete composite part. A steel pipe concrete composite pile in which the concrete pile head joint part and the steel pipe concrete composite part are integrally formed via a plurality of reinforcing reinforcing bars for coupling footing is disclosed.

  In both cases, anchor reinforcing bars to be joined to the footing are pre-embedded in the pile body, so there is no need to provide anchoring bars on the pile heads. Since the part joined to the footing of the anchor reinforcing bar can be exposed, the construction becomes simple. In addition, since the anchor rebar is integrally provided in the form embedded in the SC pile, the connection between the SC pile and the footing is stronger than the method of welding the anchor bar to the outer wall or end plate of the steel pipe. There are effects such as.

JP 07-018675 A JP 2009-161996 A

  However, what is described in Patent Document 1 is simply a structure in which a plurality of anchor reinforcing bars are embedded in the axial direction of a concrete tubular body, and is not a hook-like shape having horizontal bars, so that it does not necessarily have a strong reinforcing bar structure. Not.

  Moreover, although the manufacturing method of this SC pile is not disclosed, since the SC pile is manufactured by centrifugal molding, in general, simply arranging a plurality of anchor reinforcing bars in the axial direction may cause a deviation during manufacturing. It is difficult to embed the anchor rebar uniformly in the concrete cylindrical body at predetermined intervals so that no stress is generated while the anchor rebar is held straight in the axial direction.

  Moreover, although what is described in patent document 2 is fixing the reinforcement reinforcing bar (anchor reinforcing bar) for a footing with the donut-shaped metal fitting and the annular positioning member, the risk of causing the problem as in the above-mentioned patent document 1 is low. In addition, since the contact portion between the reinforcing reinforcement for footing connection and the annular positioning member is fixed by welding or the like, if it is fixed by welding, the reinforcing reinforcement for footing connection may cause a lack of strength due to cross-sectional defects or alteration There is.

  Moreover, in the case of a deformed bar, it becomes difficult to weld. Furthermore, since the reinforcing bar reinforcement for the footing connection is performed across the internal space of the steel pipe installed in the formwork, when a steel pipe having an outer diameter of 600 mm or less is used, it becomes difficult for an assembly worker to enter the steel pipe. There is also a problem that workability is deteriorated.

  The present invention has been made in view of the above-mentioned problems, and its purpose is to provide an SC pile and an SC pile that have a strong bar arrangement structure with anchor reinforcing bars at the head of the pile and that are easy to perform foundation work for structures and the like. It is in providing the method of manufacturing simply.

As a result of intensive studies to achieve the above object, the present inventors have supported (1) an anchor reinforcing bar by an end plate at the pile head end, and (2) a combined use of an annular guide plate and a reinforcing ring, (3) If the anchor rebar is not welded as much as possible, and (4) the anchor rebar assembly consisting of the anchor rebar, the end plate, the annular guide plate and the reinforcing ring is assembled in advance in the manufacture of the SC pile The present invention has been completed. The contents are described in claims 1 to 6 ,

The invention according to claim 1 of the present application is an SC pile in which a plurality of anchor reinforcing bars joined to a footing in a pile concrete of a pile head are arranged at intervals in the circumferential direction, anchor rebar is supported by the end plate at the end of the pile head, and is fixed by an annular guide plates and the reinforcing ring insertion grooves are provided along the inner circumferential periphery or for inserting the anchor rebar The annular guide plate and the reinforcing ring are provided without welding to the anchor reinforcing bar, and the annular guide plate and a part of the reinforcing ring are inserted through the anchor reinforcing bar. The SC pile is characterized in that it is integrally provided.

  The anchor reinforcing bar is also called a reinforcing reinforcing bar in the pile, a reinforcing reinforcing bar for footing connection, and the like, and plays a role of a pile head connecting reinforcing bar (fixed reinforcing bar) joined to the footing. In the SC pile according to the present invention, the piles are arranged annularly and parallel to the axial direction at predetermined intervals in the pile body of the pile head.

  With such a structure, footing work can be simplified without the need to provide anchoring bars on the pile head. Moreover, the said anchor reinforcement is supported by the end plate in the edge part of a pile head. Since the anchor reinforcing bars are supported by the end plates, the anchor reinforcing bars can be easily arranged at the time of manufacture, and the footing work can be easily performed because of the strong reinforcing bar arrangement structure.

  The anchor reinforcing bars are fixed by an annular guide plate or an annular guide plate and a reinforcing ring. The annular guide plate is used for positioning and preventing misalignment when the anchor reinforcing bar is disposed in the pile body. Moreover, it also plays a role of reinforcing the bar arrangement structure by anchor reinforcing bars. As the annular guide plate, a conventional guide plate used when assembling the reinforcing bar rod can be used.

  The reinforcing ring is used for bundling a hook-shaped member made of an anchor guide bar annular guide plate and reinforcing the anchor bar reinforcing by the ring guide plate. The reinforcing ring includes an outer ring wound around the outer periphery of the bowl-shaped member and an inner ring disposed on the inner periphery, and can be appropriately used. These reinforcing rings include a plate shape and a rod shape.

  The annular guide plate and the reinforcing ring are provided without welding to the anchor reinforcing bar. By not welding, deterioration of the anchor rebar can be prevented, so that the connection with the footing becomes firm.

Further, in the present gun onset bright, annular guide the plate is provided along the inner circumference is an outer peripheral or insertion grooves, with the annular guide plate and a portion of the reinforcing ring, for passing these anchor rebar so as to form the insertion hole, that provided integrally.

  Although the annular guide plate and the reinforcing ring may be provided at different positions, the annular guide plate is mainly used for positioning the anchor rebar, so the anchor rebar cannot be firmly fixed at that position only by the annular guide plate. . By combining with the reinforcing ring, the anchor reinforcing bar is fixed even at the position of the annular guide plate, so that a strong reinforcing bar arrangement structure is obtained. In particular, in the annular guide plate provided with an insertion groove for inserting the anchor rebar along the outer circumference or inner circumference, these holes are integrally provided so as to form an insertion hole for passing the anchor rebar through the reinforcing ring. If so, the fixing effect is large, which is preferable.

The invention according to claim 2 of the present application, "a pile body side of said end plate, according to claim 1, characterized in that the support pipe can be supported by simply inserting the anchor rebar is provided with a plurality of SC pile ".

  As described above, the anchor reinforcing bar is supported by the end plate at the pile head end. The support method is not particularly limited, and is generally performed by welding to an annular flat bar erected on the end plate. For example, when the removal portion is as short as 20 cm or less, a support pipe is provided inside the pile body. It is preferable to use a plurality of end plates.

  If this end plate is used, the anchor rebar can be supported simply by being inserted into the support pipe, so that the labor of welding can be saved. Moreover, since there is no welding to the anchor reinforcing bars, deterioration due to the welding of the anchor reinforcing bars can be prevented.

  Usually, a plurality of support pipes are provided in an annular shape in accordance with the reinforcing bar arrangement position. The support pipe is attached to the end plate by a conventional pipe attachment method such as welding. The material of the support pipe is not particularly limited, but a weldable metal is preferable because attachment by welding is simple.

The invention according to claim 3 of the present application, "between the outer shell steel tube and the reinforcing ring of the SC piles, SC according to claim 1 or 2, characterized in that spacers and wedges are provided "Pile".

  The SC pile has a shell steel pipe and is manufactured by placing concrete on the inner surface by centrifugal molding. However, since the annular guide plate and the reinforcing ring are provided without welding to the anchor reinforcement, If there is a gap between them, these positions may be misaligned or the reinforcing ring may come off. Therefore, it is preferable to provide a spacer or a wedge in the gap between the outer shell steel pipe and the reinforcing ring so that the initial bar arrangement structure by the anchor reinforcing bar or the like does not collapse.

The invention according to claim 4 of the present application is that “ anchor reinforcing bars joined to the footings are arranged in the pile body concrete of the pile head at intervals in the circumferential direction, and the protruding portion is 100 cm or more. a S C pile Ru Ah, the anchor rebar is supported by the end plate at the end of the pile head, the insertion groove for inserting the anchor rebar is provided along the inner circumferential periphery or cyclic guide plates and are fixed by the reinforcing ring, wherein the cyclic guide plate and the reinforcing ring, the anchor rebar to provided without welding, these anchor reinforcement and said reinforcement ring and the annular guide plate What is combined and integrated so as to form an insertion hole for passing through is small at an equal distance of 40 to 60 cm from the interface across the interface between the protruding portion and the remaining portion in the pile hole. It is S C pile "you wherein is provided a pair even without.

  The arrangement of the annular guide plate and the reinforcing ring varies depending on the length of the anchor reinforcing bar and the length of the protruding part, so it cannot be determined unconditionally. However, if the protruding part is longer than 100 cm, the annular guide plate and the reinforcing ring are integrated. It is preferable that at least one pair is formed at an equal distance of 40 to 60 cm from the interface across the interface between the protruding portion and the remaining portion in the pile hole.

  A structure in which the annular guide plate and the reinforcing ring are integrated is capable of firmly positioning the anchor reinforcing bars and has a great effect in terms of reinforcing the bar arrangement structure. Therefore, if it exists in the position of the said range, since the pile head becomes a durable reinforcement arrangement | positioning structure combined with the reinforcement by the end plate of an edge part, it can carry out the construction work with a lifting work or a footing reliably.

The invention according to claim 5 of the present application, "a process for the preparation of the SC piles according to any one of claims 1-4, before Symbol anchor rebar is supported by the front Symbol end plates, and pre-Symbol annular guide plate and leave preassembled anchor rebar assembly comprising fixed by the reinforcing ring, then inserting the assembly from the opposite side of the pile head with the end plate in the outer shell steel of the SC piles The anchor rebar is arranged in the outer shell steel pipe , and the anchor rebar assembly is annularly formed in the pile axis direction on the standing surface of the annular flat bar in which a plurality of anchor rebars are erected on the end plate. It is arranged and welded, and the anchor rebar is inserted into the annular guide plate provided at a predetermined position to form a hook shape, or a plurality of support pipes provided annularly inside the pile body of the end plate Insert the anchor iron Is inserted into the annular guide plate provided at a predetermined position and supported in a hook shape, and the reinforcing ring is wound around the outer periphery of the hook-shaped anchor reinforcing bar at a predetermined position. The SC pile manufacturing method is characterized by being assembled by attaching a spacer to a reinforcing ring that is restrained and fixed and wound around the outer periphery .

  In this way, an anchor rebar assembly consisting of an end plate, anchor rebar, annular guide plate, reinforcing ring, etc. is assembled in advance at a place different from the place where the SC pile is centrifugally formed, and this is later assembled in the outer shell steel pipe. If a forklift or a crane is used to install it, the assembly work in the steel pipe is eliminated, so that the manufacture of the SC pile can be simplified and the assembly worker cannot enter the outer shell steel pipe. It is also possible to handle SC piles.

Further, the with the present gun onset bright, before Symbol anchor rebar assembly is welded by disposing annularly Kuijiku direction a plurality of anchor rebar stand設面annular flat bar which is erected on the end plate An anchor rebar is inserted into the annular guide plate provided at a predetermined position to form a hook shape, or is inserted into a plurality of support pipes provided in an annular shape inside the pile body of the end plate and the anchor rebar is specified. It is inserted into the annular guide plate provided at the position of and is supported in the form of a hook, and the reinforcing ring is wound around the outer periphery of the hook-shaped anchor reinforcing bar at a predetermined position to restrain and fix the anchor reinforcing bar. and, Ru assembled by attaching a spacer to the wound reinforcement ring on the outer periphery.

  Here, the method of attaching the anchor reinforcing bar to the end plate is limited to a method using welding or a method using a support pipe. If the SC pile removal part is as short as 20 cm or less, the latter is simpler and it is preferable to use this method.

The invention according to claim 6 of the present application is as follows: “The anchor rebar assembly is formed at the position in contact with the annular guide plate so that an insertion hole is formed by the annular guide plate and a part of the reinforcing ring. 6. The SC pile manufacturing method according to claim 5 , wherein the reinforcing ring used for forming the insertion hole is combined with the annular guide plate to be integrated and assembled. is there.
The plurality of anchor reinforcing bars are arranged in a bowl shape (annular) substantially in parallel with the pile axis direction by the end plate and the annular guide plate. When the annular guide plate is previously provided with an insertion hole for inserting the anchor reinforcing bar, the process according to the sixth aspect is not necessarily required, but the insertion groove for inserting the anchor reinforcing bar has an outer periphery or an inner periphery. Therefore, it is preferable to form the insertion hole in combination with the reinforcing ring.

  As for the reinforcing ring, an outer ring is used when an insertion groove is formed on the outer periphery, and an inner ring is used when an insertion groove is formed on the inner periphery. Moreover, it is preferable to use the annular guide plate of any shape by integrating it with the reinforcing ring by welding or the like from the viewpoint of strength and anchor reinforcement. Reinforcing bars are also used alone, and are anchored to the anchor reinforcing bars by being installed on the inner periphery of the hook-shaped anchor reinforcing bars or wound around the outer periphery.

  After fixing the anchor reinforcing bars, spacers are attached to the outer ring of the reinforcing bars. The material, shape, and mounting method of the spacer are not particularly limited. The anchor rebar assembly assembled as described above is stored as it is until it is centrifuged, or inserted into the outer shell steel pipe and stored.

As described above, when the removed portion of the SC pile is as short as 20 cm or less, it is preferable to support the anchor reinforcing bar with the end plate, and in that case, to support the anchor reinforcing bar inside the pile body of the end plate. The end plate of the present invention provided with a plurality of supporting pipes is used.

  As shown in Patent Document 2, SC piles in which anchor reinforcing bars are attached to end plates are known, but conventionally, they have been attached by welding or fixing members (screws, bolts, etc.). If the end plate provided with the support pipe of the present invention is used, it is possible to simplify the work of attaching the anchor reinforcing bar to the end plate.

  The support pipe is provided on the inner side of the pile body in accordance with the bar arrangement structure of the anchor reinforcing bar. The material of the support pipe is not particularly limited, but a material that facilitates attachment to the end plate is preferable.

  The dimensions of the support pipe are not particularly limited. If the length is too short, it cannot be supported firmly. If it is too long, it will be difficult to insert the anchor rebar and waste will increase. The inner diameter is preferably such that the anchor rebar can be easily inserted and does not deviate greatly in the radial direction after insertion. In order to strengthen the support force, the gap between the support pipe and the anchor reinforcing bar may be filled and fixed with a filler or the like. This end plate of the present invention is removed from the anchor reinforcing bar and collected in the joining work with the footing.

  In the SC pile of the present invention, anchor rebars arranged in a bowl shape (annular) are supported at the pile head end by end plates and fixed by an annular guide plate and a reinforcing ring, and welding to the anchor rebars is reduced. An anchor reinforcing bar assembly having a strong reinforcing bar structure is provided on the pile head. Therefore, if the SC pile of the present invention is used, the foundation work such as a structure can be easily and reliably performed, and a solid foundation such as a building can be constructed.

  In addition, since the SC pile manufacturing method of the present invention is a method of assembling the anchor rebar assembly at a place different from the place where centrifugal molding is performed, the SC pile can be easily manufactured and can be applied to a small-diameter SC pile. At the same time, it can handle complex reinforcement structures.

It is a reinforcement structure before placing concrete by centrifugal forming in the SC pile of the present invention, (a) is a front view thereof, (b) is a side view of the pile head side, and (c) is an outer ring ( (D) is a side view at a location where an annular guide plate and an outer ring (reinforcement ring) are integrated. (A) It is a perspective view which shows the example of attachment to the end plate of the anchor reinforcement by welding. (B) It is the attachment figure to the end plate of the anchor reinforcement using the support pipe of the present invention. It is the figure which expanded what formed the annular guide plate and inner ring in FIG. 1 integrated, (a) is a front view in the state which penetrated the anchor reinforcement, (b) is in Z of FIG. 3 (a). It is a partial enlarged view. It is another example of the cyclic | annular guide plate which consists of an inner ring and a U volt | bolt, (a) is the perspective view, (b) is the top view. It is an example of a spacer, (a) is a plan view of the spacer, (b) is a side view of the spacer, and (c) and (d) are views of attaching the spacer to the outer ring.

  Hereinafter, specific embodiments of the present invention will be described. In addition, what is described below is only an example of this invention, and this invention is not limited to this.

A. SC Pile FIG. 1 shows a reinforcing bar structure 1 (hereinafter simply referred to as a reinforcing bar structure 1) before placing concrete by centrifugal molding in the SC pile of the present invention, (a) is a front view thereof, ( b) is a side view of the pile head side, (c) is a side view at a place where an outer ring (reinforcing ring) is arranged, and (d) is an integrated ring guide plate and outer ring (reinforcing ring). It is a side view in the place which arranged things.

  The reinforcing bar structure 1 includes the anchor rebar assembly 10 of the present invention inserted in the direction of the arrow from the opposite side of the pile head end plate 3 (hereinafter simply referred to as end plate 3) in the outer shell steel pipe 2. Is built. An SC pile is manufactured by installing this reinforcing bar structure 1 in a formwork and placing the expanded concrete 12 inside the mold while centrifugally forming it.

  The reinforcing bar structure 1 includes an outer shell steel pipe 2 and an anchor reinforcing bar assembly 10, and the anchor reinforcing bar assembly 10 has an end plate 3 at a pile head end portion. In addition, an anchor reinforcing bar 4, an annular flat bar 5, It consists of an outer ring (reinforcing ring) 6, a spacer 8, an annular guide plate 7, and an inner ring (reinforcing ring) 9. If there is a gap between the outer shell steel pipe 2 and the spacer 8, a wedge 11 for reinforcing fixation is appropriately disposed after the anchor rebar assembly 10 is installed in the outer shell steel pipe 2.

X is a boundary between the protruding portion and the remaining portion, and the anchor reinforcing bar 4 on the end plate 3 side from X is exposed by the lifting work, and is used for coupling with the footing.
There is an end plate 3 at the pile head end, and a plurality of anchor reinforcing bars 4 are supported in an annular shape parallel to the pile axis direction.

  Here, an annular flat bar 5 is erected on the end plate 3, and an anchor reinforcing bar 4 is attached thereto by welding. An enlarged view is shown in FIG.

  Usually, such an end plate 3 is used. For example, when the removal portion is as short as 20 cm or less and deformation of the exposed streak is difficult to occur, the support pipe 13 is provided inside the pile body as shown in FIG. A plurality of end plates 3 can be used. If this end plate 3 is used, the anchor rebar 4 can be supported simply by being inserted into the support pipe 13, so that the trouble of welding the anchor rebar 4 can be saved and deterioration due to welding of the anchor rebar 4 can be prevented.

  The support pipe 13 is made of iron and is attached to the end plate 3 by welding. The length of the support pipe 13 is not particularly limited, but is usually about 10 to 20 cm. The inner diameter of the support pipe is not particularly limited as long as the anchor reinforcing bar 4 can be smoothly inserted. For example, the deformed reinforcing bar is named about +6 mm, and in the case of D29, the inner diameter is about 35 mm.

  After the anchor rebar 4 is inserted into the support pipe 13, a filler such as fine sand may be filled in the gap so that the anchor rebar 4 cannot be easily pulled out. The anchor reinforcing bar 4 is embedded in the concrete of the SC pile main body, and in the projecting portion, the anchor reinforcing bar 4 is exposed by the projecting work and serves as a fixing bar used for coupling with the footing.

  Usually, deformed reinforcing bars D16 to D39 are used and arranged in a bowl shape (annular) at equal intervals. Here, 26 anchor reinforcing bars 4 are arranged.

  In the present invention, a plurality of annular guide plates 7 are used as shown in FIG. 1 in order to facilitate the reinforcement (positioning) and fixing of the anchor reinforcing bars 4. The outer diameter of the annular guide plate 7 is a dimension that can be smoothly accommodated in the outer shell steel pipe without leaving a large gap.

  A shape is not specifically limited, A well-known thing can be used. For example, it is disclosed in Japanese Patent Application Laid-Open Nos. 2002-227188 and 2003-13550. As shown in these figures, the annular guide plate 7 is provided with an insertion groove or an insertion hole for inserting the anchor reinforcing bar 4, and by inserting the anchor reinforcing bar 7 therethrough, the end plate 3 and the annular guide plate 7 are inserted. The anchor rebar 4 is locked (fixed). Although the annular guide plate 7 may be used alone, it is preferable to use it in combination with a reinforcing ring as shown in FIG.

  Further, in the present invention, reinforcing rings are arranged at a predetermined interval in order to reinforce fixing of the hook-shaped anchor reinforcing bars 4 locked (fixed) by the end plate 3 and the annular guide plate 7. The reinforcing ring includes an outer ring 6 and an inner ring 9, which are properly used depending on the situation. The shape is roughly divided into a plate-like shape (flat bar) and a rod-like shape, and the shape can be properly used depending on the situation.

  In the example of FIG. 1, a rod-shaped outer ring 6 having an outer diameter of 89 cm is provided between the end plate 3 and the annular guide plate 7 or between the annular guide plates 7 so that the intervals are substantially equal. . The installation position and number are not particularly limited as long as the anchor-shaped reinforcing bar 4 can be firmly restrained and fixed.

  In the example of FIG. 1, the rod-shaped inner ring 9 is welded and fixed to the annular guide plate 7 so as to form the insertion hole 15 with the insertion groove 14 provided along the inner periphery of the annular guide plate 7. It is used integrally with the annular guide plate 7.

  The above-described annular flat bar 5 shown in FIGS. 1 and 2 is also a kind of inner ring. One reinforcing ring may be wound in the circumferential direction of the hook-shaped anchor reinforcing bar and the ends may be fixed by welding or the like, but a divided member divided into a plurality in the circumferential direction may be used. If the divided parts are used, the operation becomes easy.

  FIG. 3 is an enlarged view of the annular guide plate 7 and the inner ring 9 in FIG. (A) is a front view in the state which penetrated the anchor reinforcing bar 4, (b) is the elements on larger scale in Z of Fig.3 (a).

  The annular guide plate 7 is the same as that disclosed in JP-A-2003-13550, and a plurality of insertion grooves 14 are annularly provided on the inner peripheral side. The anchor reinforcing bars 4 are inserted into the respective insertion grooves 14, and a rod-shaped inner ring 9 is in contact with the annular guide plate 7, and the insertion grooves 14 form insertion holes 15 so as to sandwich the anchor reinforcement bars 4.

  The annular guide plate 7 and the inner ring 9 are integrated by welding 16. By adopting such a structure, the anchor rebar 4 is firmly fixed, so that it is possible to prevent misalignment at the time of conveyance and manufacture, and the anchor rebar assembly 10 having a strong structure can be obtained. It becomes easy to do.

As described above, the annular guide plate 7 is not limited to the above example, and various forms can be used.
For example, when using an annular guide plate having an insertion groove on the outer periphery as disclosed in FIG. 8 of JP-A-2002-227188, the outer ring may be used in the same manner as described above.

  Moreover, when using the annular guide plate in which the insertion hole is formed from the beginning as disclosed by FIG. 1 of Unexamined-Japanese-Patent No. 2002-227188, it does not necessarily need to be integrated with a reinforcement ring.

  FIG. 4 shows another example of the annular guide plate. (A) is the perspective view, (b) is the top view. In this example, a flat bar-shaped inner ring 9 constitutes a part of the annular guide plate 7, and the inner ring 9 and the U bolt 17 constitute the annular guide plate 7. The anchor reinforcing bar 4 is inserted into an insertion hole 15 formed by the inner ring 9 and the U bolt 17 and is fixed by the U bolt.

Various types of U-bolts can be used, such as JP-A-11-343739, JP-A-2002-106113, JP-A-2003-129664, and JP-A-2003-171929.
As in this example, the annular guide plate referred to in the present invention may also serve as a reinforcing ring.

  The outer ring 6, the inner ring 9, and the annular guide plate 7 are all welded to the anchor reinforcing bar 4. If necessary, a well-known mounting bracket or Bangsen may be used, but it is time-consuming and expensive, so it is better not to use it as much as possible. Since the anchor reinforcing bar 4 is not welded to prevent the anchor reinforcing bar from deteriorating, an SC pile having a strong reinforcing bar structure can be obtained.

  In the present invention, a spacer is provided at a suitable location on the outermost side of the anchor rebar assembly 10 so that the anchor rebar assembly 10 is easily inserted into the outer shell steel pipe 2 and, after insertion, these gaps are reduced and inscribed as much as possible. 8 is preferably provided. In the example of FIG. 1, the outer ring 6 and the annular guide plate 7 are attached.

  The shape, dimensions, mounting position, number, and the like of the spacer 8 are not particularly limited as long as the above object can be achieved. FIG. 5 shows an example of the spacer. (A) is a plan view of the spacer, (b) is a side view of the spacer, and (c) and (d) are views of attaching the spacer to the outer ring. The spacer 8 shown here is formed by slightly curving an iron piece having a thickness of 4.5 mm, and is welded to the outer ring 6 with the peak portion outside.

  1 is assembled in advance, and then inserted into the outer shell steel pipe 2 by a forklift, a crane, or the like to form a reinforcing bar structure 1. In this case, FIG. As shown, a wedge 11 is installed for fixed final adjustment.

The material of the outer shell steel pipe is generally STK400, STK490 specified in JIS G 3444, SKK400, SKK490 specified in JIS A 5525, or the like. Expanded concrete is placed on the reinforcement structure 1 to form the SC pile of the present invention. For example, the concrete is high-strength concrete having a design standard strength of 80 N / mm ² or more.

B. SC pile manufacturing method An example of the SC pile manufacturing method of the present invention is shown below.

1. Assembling the anchor rebar assembly The following work is performed at the place where the anchor rebar assembly is manufactured.

(1) Prepare an end plate provided with an annular flat bar as shown in FIG. 2 (a) or an end plate provided with a support pipe as shown in FIG. 2 (b). These are set up by welding.

(2) A plurality of annular guide plates and inner rings as necessary are arranged at predetermined intervals, and anchor reinforcing bars are attached to the end plates to assemble the anchor reinforcing bars. When the former end plate is used, the anchor rebar is attached by welding to the annular flat bar, and when the latter end plate is used, it is inserted into the support pipe.

(3) When an annular guide plate with an insertion groove on the outer periphery or inner periphery is used, an outer ring or an inner ring is placed in contact with the annular guide plate to form an insertion hole, and the annular guide plate and the outer ring are welded. The ring or the annular guide plate and the inner ring are integrated and the anchor reinforcing bar is fixed.

(4) Place the outer ring in place and reinforce the anchor reinforcement.
The outer ring and the inner ring shown in (3) and (4) may be either ring-shaped or made of divided members divided in the circumferential direction. These end portions are welded and integrated.

(5) Attach the spacer to the outer ring and, if necessary, the annular guide plate, and complete the assembly of the anchor rebar assembly.

(6) The assembled anchor rebar assembly is stored at the storage location until the SC pile is manufactured.

2. Construction of reinforcement structure The following work is done at the construction place of reinforcement structure.

(1) The anchor rebar assembly assembled in advance as described above is inserted into the outer shell steel pipe using a forklift or a crane.

(2) Weld and fix the outer shell pipe and end plate.

(3) In order to prevent the inserted anchor rebar assembly from being deformed or misaligned in the outer shell steel pipe, it is fixed by welding by placing wedges at appropriate locations on the outer ring and the annular guide plate. Complete the construction of the muscle structure.

(4) Move the constructed reinforcement structure to the centrifugal forming location of the SC pile.

3. Concrete placement The following work is performed at the centrifugal forming site of the SC pile.

(1) Place the above bar arrangement structure in a centrifugal mold.
(2) Using a conventional SC pile manufacturing method, concrete of a predetermined composition is put into a centrifugal mold and centrifugally formed.

4). Curing The following work is carried out by the conventional curing method at the curing site of SC pile.
(1) Steam cure the above-mentioned centrifugally-formed SC pile.
(2) Carry out natural curing (in-air curing) for 7 days at the SC pile yard.
The curing method is not limited to this, and autoclave curing may be used.

  The said SC pile obtained by the said manufacturing method is used as an upper pile in the joining construction of a foundation pile and a footing. The outer shell steel pipe is cut at a predetermined protruding portion, the concrete is extracted, and a part of the anchor rebar assembly is exposed. Thereafter, the end plate, the annular guide plate, the outer ring, the inner ring, and the like are removed, and the anchor rebar of the portion to be joined to the footing is obtained.

  The SC pile according to the present invention is suitable as an upper pile used for coupling with a footing in foundation work when a structure such as a building is constructed. Moreover, according to the manufacturing method of the SC pile concerning this invention, although the SC pile of this invention can be manufactured simply, the manufacture of the various pile which distributes a reinforcing bar not only in an SC pile but in a pile body is also possible. Moreover, the end plate which concerns on this invention which has a support pipe can be utilized not only for the SC pile which arranged the anchor reinforcement, but also for the various piles which arranged the main reinforcement (longitudinal).

DESCRIPTION OF SYMBOLS 1 ... Reinforcement structure, 2 ... Outer shell steel pipe, 3 ... End plate of pile head, 4 ... Anchor reinforcement, 5 ... Annular flat bar, 6 ... Outer ring (reinforcement ring), 7 ... Annular guide plate, 8 ... Spacer, 9 ... Inner ring (reinforcing ring), 10 ... Anchor rebar assembly, 11 ... Wedge, 12 ... Expanded concrete, 13 ... Support pipe, 14 ... Insertion groove, 15 ... Insertion hole, 16 ... Welding, 17 ... U bolt X ... The boundary between the protruding part and the remaining part

Claims (6)

An SC pile in which a plurality of anchor rebars joined to the footings in the pile body concrete of the pile head are arranged at intervals in the circumferential direction, and the anchor rebar is at the end of the pile head is supported by an end plate, the anchor rebar are secured by annular guide plates and the reinforcing ring insertion groove for inserting is provided along the outer circumference or inner circumference of the said annular guide plate and the reinforcing ring Is provided without welding to the anchor rebar, and the annular guide plate and a part of the reinforcing ring are integrally provided so as to form an insertion hole for the anchor rebar to pass therethrough. SC pile characterized by being made. The pile body side of said end plate, SC piles according to claim 1, characterized in that the support pipe can be supported by simply inserting the anchor rebar is provided with a plurality. Wherein between the outer shell steel tube and the reinforcing ring SC piles, SC piles according to claim 1 or 2, characterized in that spacers and wedges are provided. A plurality of anchor reinforcing bars joined to the footing in the pile body concrete of the pile head are arranged at intervals in the circumferential direction, and are SC piles having a protruding portion of 100 cm or more, wherein the anchor reinforcing bars are , The end of the pile head is supported by an end plate, and an insertion groove for inserting the anchor rebar is fixed by an annular guide plate and a reinforcing ring provided along the outer periphery or inner periphery, and the annular The guide plate and the reinforcing ring are provided without welding to the anchor rebar, and the annular guide plate and the reinforcing ring are joined to form an insertion hole for passing the anchor rebar through them. At least one pair is provided at an equal distance of 40 to 60 cm from the interface across the interface between the protruding portion and the remaining portion in the pile hole. SC piles characterized. A method of manufacturing a SC pile according to any one of claims 1-4, wherein the anchor rebar is supported by the end plate, and anchor reinforcing bars made fixed by the annular guide plate and the reinforcing ring the assembly is previously assembled, then Haisuji anchor rebar is inserted from the opposite side of the pile head with the end plate to the shell inside the steel pipe to the outer shell within the steel tube of the SC piles the assembly manufacturing The anchor rebar assembly includes a plurality of anchor rebars arranged in an annular shape in the pile axis direction and welded to a standing surface of an annular flat bar that is erected on the end plate, and the anchor rebars are in a predetermined position. Or inserted into a plurality of support pipes provided annularly on the inner side of the pile body of the end plate, and the anchor rebar is provided at a predetermined position. The ring It is inserted into a guide plate and supported in the form of a hook, and the reinforcing ring is wound around the outer periphery of the hook-shaped anchor reinforcing bar at a predetermined position to restrain and fix the anchor reinforcing bar, and then wound around the outer periphery. A method for manufacturing an SC pile, wherein a spacer is attached to the reinforcing ring and assembled . The anchor rebar assembly restrains and fixes the anchor rebar so as to form an insertion hole between the annular guide plate and a part of the reinforcing ring at a position in contact with the annular guide plate, and forms the insertion hole. 6. The method of manufacturing an SC pile according to claim 5 , wherein the reinforcing ring used to perform the integration is assembled and combined with the annular guide plate.

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