JP2014047560A - Joint jig and joint method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce labor and costs for joining a pile and concrete together, while increasing transmission strength of a structure for joining the pile and the concrete together.SOLUTION: A joint jig 1 is used to join a pile head part of a pile 20 to concrete A. The joint jig 1 can be attached to the pile head part of the pile 20. The joint jig 1 has an annular plate 10 which has an outside diameter larger than an outside diameter of a top surface 20a of the pile 20 and which has an inside diameter smaller than an inside diameter of the top surface 20a of the pile 20, and a plurality of reinforcements 11 which are vertically protruded along an axial direction in the annular plate 10, which are fixed to an inner peripheral surface 10a of the annular plate 10 and which are at least partially provided with anchorage members 11a.

Description

  The present invention relates to a joining jig for joining a pile head of a pile and concrete and a joining method using the joining jig.

  Conventionally, when joining a pile head and concrete, a method has been used in which a reinforcing bar is welded to the pile head and concrete including the reinforcing bar is joined on the pile head.

  By the way, in recent years, with an increase in bearing capacity of piles, it has been required to increase the transmission strength of the joint structure between the piles and concrete.

  Patent Document 1 discloses a method in which a pile in which a large-diameter bearing plate having an outer diameter larger than that of a steel pipe is welded to the upper end of a steel pipe pile head and a reinforcing bar is welded to the upper surface of the large-diameter bearing plate. In Patent Document 2, one end of a reinforcing bar is welded to a steel pipe side face of a pile head from a position lower than a predetermined length from the upper end of the pile to form an unwelded reinforcing bar extending part outside the foundation slab. Is disclosed.

JP 2004-270416 A JP 2008-14118 A

  However, in the former case, it is necessary to weld a large-diameter bearing plate to the pile at the factory, which requires labor and costs including the work of transporting the pile. In addition, if the pile stays high when the pile is placed on site, it is necessary to cut the pile head and perform welding or the like on site. In the case of the latter structure, it is necessary to weld a steel bar to a steel pipe pile at the factory or on-site, which still requires time and cost.

  The present invention has been made in view of such a point, and when joining a pile head and concrete, a joining jig that obtains high transmission strength and does not require welding work on the pile, and the joining jig are used. It is an object of the present invention to provide a bonding method.

  The present invention for achieving the above object is a joining jig for joining a pile head of a pile and concrete, wherein the joining jig includes an annular plate and an inside of the annular plate along an axial direction. A plurality of reinforcing bars that protrude vertically and are fixed to the inner peripheral surface of the annular plate, and the annular plate can be placed on the top surface of the pile head, and has an outer diameter that is greater than that of the pile head. It is a joining jig that is large and has an inner diameter smaller than that of the pile head, and the reinforcing bar is provided with a fixing member for improving the fixing property to concrete.

  According to the present invention, since the outer diameter of the annular plate placed on the upper surface of the pile head is larger than the outer diameter of the pile head, the load from above can be dispersed, and the transmission strength of the joint structure of the pile and concrete can be reduced. It can be improved. In addition, it is possible to join a pile and concrete by attaching a jig with multiple rebars fixed to the inner peripheral surface of the annular plate to the pile head and supplying concrete into the pile from the opening of the annular plate. The welding work to the pile can be omitted, and the joining work is simplified. Therefore, it is possible to improve the transmission strength of the joint structure between the pile and the concrete and reduce the labor and cost of joining the pile head and the concrete. Furthermore, since the fixing member is provided in the reinforcing bar, the fixing length of the reinforcing bar to the pile head concrete and the concrete in the pile can be shortened, and the amount of reinforcing bar can be reduced.

  The positions of at least some of the reinforcing bars in the axial direction of the fixing member may be different from those of other reinforcing bars.

  Further, the reinforcing bar may extend outward above the annular plate.

  The present invention according to another aspect is a method of joining a pile head and concrete using the joining jig, wherein a reinforcing bar projecting under the joining jig is inserted into the pile from the upper surface of the pile head. Inserting the annular plate on the top of the pile head and attaching the joining jig to the pile head; and supplying concrete into the pile through the opening of the annular plate. It is a joining method.

  ADVANTAGE OF THE INVENTION According to this invention, while improving the transmission yield strength of the joining structure of a pile and concrete, the amount of reinforcing bars can be reduced and the effort and cost of joining a pile head and concrete can be reduced.

It is a perspective view of a joining jig. It is sectional drawing of the joining jig attached to the pile. It is a top view of a joining jig. It is explanatory drawing which shows the state with which the pile head and concrete were joined. It is a perspective view which shows the joining jig | tool with a slip stopper and a baseplate. It is sectional drawing which shows the state by which the joining jig | tool with a slip stopper and a baseplate was constructed. It is a perspective view of the joining jig from which the position of a fixing member differs along the axial direction. It is a perspective view of the other joining jig in which the position of the fixing member differs along the axial direction. It is sectional drawing of the joining jig | tool where the reinforcing bar was bent. It is explanatory drawing which shows the example of the shape of a fixing member. It is explanatory drawing which shows the example of the shape of a slip stopper.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a joining jig 1 according to the present embodiment.

  The joining jig 1 can be attached to a pile head of a pile such as a steel pipe pile. As shown in FIG. 1, the joining jig 1 includes an annular plate 10, a plurality of reinforcing bars 11 protruding vertically in the annular plate 10 along the axial direction, and fixed to the inner peripheral surface 10 a of the annular plate 10, A fixing member 11a provided on at least a part of the reinforcing bar 11 (the upper end of the reinforcing bar in the drawing).

  The fixing member 11 a has a larger diameter than the other part of the reinforcing bar 11 and protrudes outward. Examples of the fixing member 11a include a nut-shaped fitting attached to the outer periphery of the reinforcing bar 11 and a member obtained by deforming the end of the reinforcing bar 11. 10A and 10B show examples of the shape of the fixing member 11a. The fixing member 11 a shown in FIG. 10A is a nut-like member fitted into the threaded reinforcing bar 11, and the vertical position of the fixing member 11 a can be changed. The fixing member 11 a shown in FIG. 10B has a T-head shape integrated with the reinforcing bar 11, and is formed on the upper end or the lower end of the reinforcing bar 11. The position of the fixing member 11a is not limited to the end of the reinforcing bar, and may be any position in the reinforcing bar. However, when the fixing member 11a is disposed at the upper end or the lower end of the reinforcing bar 11, fixing performance can be effectively expressed, which is preferable. .

  As shown in FIG. 2, the annular plate 10 can be placed on the upper surface 20 a of the pile head of the cylindrical pile 20. The outer diameter of the annular plate 10 is formed larger than the outer diameter of the upper surface 20a of the pile 20 (the outer diameter of the pile head), and the diameter of the opening serving as the inner diameter of the annular plate 10 is the diameter of the opening of the upper surface 20a of the pile 20 It is formed smaller than (inner diameter of the pile head).

  The reinforcing bars 11 are fixed along the inner peripheral surface 10a of the annular plate 10 as shown in FIG. The fixing method is not particularly limited, but is preferably welded. The interval at which the reinforcing bars 11 are fixed is not particularly limited, but is preferably an equal interval.

  Next, a method of joining a pile head and concrete using the joining jig 1 configured as described above will be described.

  First, the joining jig 1 manufactured in advance in a factory is put on the pile head of the pile 20 as shown in FIG. At this time, the reinforcing bar 11 of the joining jig 1 is inserted into the pile 20 from the upper surface 20 a of the pile head of the pile 20, and the annular plate 10 is placed on the upper surface 20 a of the pile head of the pile 20.

  Next, as shown in FIG. 4, the concrete A is filled into the pile 20 through the opening 10 b of the annular plate 10. When the concrete A is further supplied, the concrete A having a desired shape including the reinforcing bars 11 is formed on the pile head of the pile 20.

  According to the present embodiment, since the annular plate 10 of the joining jig 1 can be placed on the upper surface 20a of the pile head of the pile 20, and the outer diameter of the annular plate 10 is larger than the upper surface 20a of the pile 20, from above. Can be distributed, and the transmission strength of the joint structure of the pile 20 and the concrete A can be improved. Moreover, the joining jig 1 in which the reinforcing bar 11 is fixed to the inner peripheral surface 10a of the annular plate 10 is attached to the pile head of the pile 20, and the concrete A is supplied from the opening 10b of the annular plate 10, and the pile 20 and the concrete are supplied. Since A can be joined, the welding work of the pile 20 becomes unnecessary and joining work becomes easy. Furthermore, the fixing length of the reinforcing bar 11 to the concrete A can be shortened by the fixing member 11a. Therefore, the effort and cost of joining the pile 20 and the concrete A can be reduced and the amount of reinforcing bars can be reduced while improving the transmission yield strength of the joint structure of the pile 20 and the concrete A. Even if the pile 20 stays high and cuts the pile head, the welding jig 1 can be placed on the cut pile head, so that welding work at the site is unnecessary.

  In addition, the fixing member 11a should just be installed in at least one of the upper end part or the lower end part of the reinforcing bar 11. When installed at the upper end of the reinforcing bar 11 located above the pile 20, the fixing length to the upper concrete A can be shortened, and when installed at the lower end of the reinforcing bar 11 inserted into the pile 20. Can shorten the fixing length to the concrete A in the pile 20.

  In the joining jig 1, as shown in FIGS. 5 and 6, a cylindrical misalignment stopper 30 that is generally matched with the inner diameter of the pile head of the pile 20 may be provided on the lower surface of the annular plate 10. With this misalignment stop 30, the rebar 11 can be easily and accurately positioned with respect to the central axis of the pile 20. The shape of the misalignment stop 30 is not particularly limited, and may be, for example, the shapes as shown in FIGS. 11 (a), (b), and (c).

  Further, as shown in FIGS. 5 and 6, a bottom plate 31 may be attached to the lower end of the reinforcing bar 11. The bottom plate 31 can block the concrete A filled in the pile 20 and reduce the amount of use of the concrete A.

  Further, in the joining jig 1, at least some of the fixing members 11a may have different positions in the axial direction from the other fixing members 11a. For example, FIG. 7 shows a case where the fixing member 11 a is provided at the upper end of the reinforcing bar 11 and the length of the reinforcing bar 11 is changed, and FIG. 8 shows the fixing member 11 a for the reinforcing bar 11 without changing the length of the reinforcing bar 11. The case where the position of the up and down direction is changed is shown. Thus, the arrangement of the upper concrete A is facilitated by the position of the fixing member 11a being different along the axial direction. Furthermore, when the reinforcing bars 11 are densely arranged, the fixing member 11a can be prevented from interfering with each other. In addition, you may combine the form of FIG. 7 and FIG. Further, the positions of all the fixing members 11a of the plurality of reinforcing bars 11 may be different, or the positions of some of the fixing members 11a may be different.

  Furthermore, in the joining jig 1, the reinforcing bars 11 may extend outward above the annular plate 10 as shown in FIG. 9. For example, the reinforcing bar 11 may be bent outward above the annular plate 10 and then extended upward. In such a case, the concrete A having a larger diameter can be appropriately reinforced.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  INDUSTRIAL APPLICABILITY The present invention is useful for reducing the labor and cost of joining a pile and concrete while improving the transmission strength of the joint structure of the pile and concrete.

DESCRIPTION OF SYMBOLS 1 Joining jig 10 Annular plate 10a Inner peripheral surface 10b Opening 11 Reinforcing bar 20 Pile 20a Upper surface 30 Dislocation stop 31 Bottom plate A Concrete

Claims (4)

A joining jig for joining a pile head and concrete,
The connecting jig is
An annular plate, and a plurality of reinforcing bars protruding up and down along the axial direction in the annular plate and fixed to the inner peripheral surface of the annular plate,
The annular plate is
It can be placed on the upper surface of the pile head, the outer diameter is larger than the pile head, and the inner diameter is smaller than the pile head,
A joining jig in which the reinforcing bar is provided with a fixing member for improving fixability to concrete.   The joining jig according to claim 1, wherein the position of the fixing member in the axial direction of at least some of the reinforcing bars is different from that of other reinforcing bars.   The joining jig according to claim 1, wherein the reinforcing bar extends outward above the annular plate. A method of joining a pile head and concrete using the joining jig according to claim 1,
Reinforcing bars that protrude under the joining jig are inserted into the pile from the top surface of the pile head, the annular plate is placed on the top surface of the pile head, and the joining jig is attached to the pile head. Process,
Supplying concrete into the pile through the opening of the annular plate.

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