JP2007138522A - Connection structure of pile and pc steel bar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection structure of a pile and a PC steel bar capable of simplifying connection work without making any projection on the outside of a connected prefabricated pile. <P>SOLUTION: A connection bar 20 having an upper huge section on the front end is erected on the upper end plate 25A of a lower pile 30A, and fitting groove strips 43 are formed in the side 4. An upper pile 30B forms an interlock receiving section capable of inserting and engaging the connection bar 20 in the outside 2 of the lower end plate 25B, and the fitting groove strips 43 are formed in the side 4 of the lower end plate 25B. The lower pile 30A is made to fall in a pile hole to hold on the ground (a), the upper pile 30B is made to fall to insert the connection bar 20 of the upper end plate 25A of the lower pile 30A in the interlock receiving section of the upper pile 30B. The upper pile 30B is rotated to make opening edges 46 and 46 coincide with each other by both piles 30A and 30B. In this case, the connection bar 20 of the lower pile 30A is interlocked with the interlock receiving section 10 of the upper pile 30B. A fitting connection member 50 is fitted to a fitting groove 49 formed by making the fitting groove strips 43 coincide with each other to constitute a connection structure 33 (b and c). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

This invention relates to the connection structure of the pile at the time of joining a some ready-made pile up and down and comprising a connection pile, and the PC steel bar used when a ready-made pile is used as a concrete pile.

  When connecting ready-made piles made of concrete, it is still common to attach steel end plates to the joint ends, attach the end plates together and weld them together. In the case of welding, skill is required, and when there is wind and rain, rain and dust affect the welding, so the progress of the work is affected by the weather and there is a problem in process management. Therefore, various methods that do not use welding have been proposed.

For example, a partially circular belt-like connector is put on, and a bolt is applied to the end plate from the outside of the connector to fix it (Patent Document 1). In another method, two connection protrusions are provided on the connection member, and the connection protrusions are inserted into the recesses provided on the upper and lower end plates to connect the upper pile and the lower pile (Patent Document 2). . Another method is to project a bolt with a head on one end plate and a large-diameter portion, large-diameter groove, or collar where the head of the bolt is inserted into the other end plate. And the structure joined within the attached end plate is proposed (patent document 3).
JP 2003-82656 A JP 2002-161531 A JP 2004-76533 A

  In Patent Documents 1 and 2, in the above-mentioned conventional technology, since the protrusion is formed on the outer surface of the ready-made pile, there is a possibility that the protrusion hits the pile hole wall and breaks the pile hole wall, and the impact is loaded on the protrusion. There was a risk that the connection between the upper and lower piles was broken or loosened. Moreover, in patent document 3, since the bolt head part 51 of the volt | bolt 5 is latched by the collar part 33 which has a level | step difference, when there is inconsistency in the contact surface of the end plate to join, there exists a possibility that it may become impossible to connect. there were.

  Moreover, it was necessary to use a material with a special structure for each connection method, such as a member used for connection, a plate, a bolt, and a special end plate. Therefore, the cost was increased and the delivery time was prolonged, and it was a factor that refused to shorten the construction period.

  In addition, PC steel bars are used only to fix prestress in concrete by fixing in the fixing holes of both end plates of ready-made concrete piles.

  However, according to the present invention, since the tapered connecting guide portion is formed at the mouth portion of the locking portion and / or the locking receiving portion, or the outer surface of the end plate and the outer surface of the fitting connecting material are substantially the same. Since it is formed, a conventional general-purpose end plate can be used as it is or after processing, thus solving the above-mentioned problems.

That is, the present invention is a connecting structure that constitutes a connecting pile by connecting both end plates by contacting the upper end surface of the end plate of the lower pile and the lower end surface of the end plate of the upper pile,
A locking projection having a locking portion at the tip is formed on the end surface of one end plate, and a locking receiving portion is provided on the end surface of the other end plate to insert the protrusion and lock the locking portion. A connecting structure for piles, wherein a locking recess is formed, and a tapered connecting guide part is formed at the edge of the locking part and / or the locking receiving part.

  In the above, the locking projection is formed into a substantially spherical locking portion by enormously forming the tip of the shaft portion, and the locking recess can be inserted through the large-diameter hole and the shaft portion large enough to allow the locking portion to be inserted. A pile characterized by forming a locking recess having a connecting guide portion in which a small-diameter hole of a size that cannot be inserted through the locking portion is juxtaposed in the circumferential direction and the opening of the small-diameter hole is expanded in a tapered shape. It is the connection structure of. Further, in the above, the lower pile and the upper pile are made of concrete piles in which stress is introduced with a PC steel rod disposed between the upper and lower end plates, and the edge of the PC steel rod is fixed to the inner peripheral side of the end plate. And a locking projection and a locking receiving portion are arranged on the outer peripheral side of the end plate. Moreover, it is the connection structure of the pile characterized by mounting the guide pipe | tube which makes the outer diameter of an upper pile or a lower pile an internal diameter in the outer periphery of the end plate of either a lower pile or an upper pile. A plurality of first fitting groove pieces are formed on the outer surface of one end plate, and a second fitting groove piece is formed on the outer surface of the other end plate corresponding to the first fitting groove. The pile connection structure is characterized in that a fitting connecting material is fitted into both the fitting grooves, and the outer surface of the end plate and the outer surface of the fitting connecting material are formed substantially the same.

  Moreover, other invention is the connection structure which contact | connects the upper end surface of the end plate of a lower pile, and the lower end surface of the end plate of an upper pile, connects both end plates, and comprises a connection pile, A plurality of first fitting groove pieces are formed on the outer side surface, and a second fitting groove piece is formed on the outer side surface of the other end plate corresponding to the first fitting groove piece. , The upper and lower piles are arranged, and a fitting connecting material common to both the fitting groove pieces is fitted, the fitting connecting material is fitted into the both fitting grooves, and the end plate This is a pile connection structure characterized in that the outer surface of the fitting connection member and the outer surface of the fitting connection member are formed substantially the same.

  Furthermore, another invention is a PC steel rod used by being embedded in a ready-made concrete pile, and the shaft portion is extended to the front end side of the enormous portion for fixing with the fixing hole of the end plate of the ready-made concrete pile, A PC steel bar characterized in that a huge portion for connection is formed at the tip of the shaft portion.

  Since the tapered connection guide portion is formed on the mouth portion of the locking portion and / or the locking receiving portion, the locking portion and the locking receiving portion can be easily locked if the upper pile is rotated. It is possible to simplify the connecting operation and to join the upper and lower piles even when there is a mismatch such as unevenness on the contact surface of the end plate.

  In addition, since the outer surface of the end plate and the outer surface of the fitting connecting material are formed substantially the same, there is no projection on the outer surface of the connected prefabricated pile, so that the protruding portion abuts the pile hole wall and connects There is no risk of destroying or breaking the pile hole wall. Therefore, there is no need to make a pile hole having a larger diameter than necessary, and there is an effect that it is possible to simplify the work of burying a ready-made pile.

  In addition, the end plate used in the present invention can be completed by providing a latch receiving portion on the end plate that has been used for general purposes, and the connecting rod should be a very short length of a general PC steel rod. Can do. Therefore, each member used in the present invention can reduce the manufacturing cost and can simplify the manufacturing process, so that the process can be shortened from the shortened delivery time.

  In addition, when the connecting steel bar is constructed by extending the enlarging part for fixing the PC steel bar, it is possible to omit the work of creating a separate connecting bar and attaching it to the ready-made pile, further simplifying the connecting work it can.

(1) A connecting rod (locking rod) 20 having an upper enormous portion 22 at its tip is erected on one surface 2 of the upper end plate 25A of the lower pile 30A (shown by a chain line 20 in FIG. 6). Fitting groove pieces 43 and 43 having a wide portion are formed (FIGS. 6A and 2A).

  The upper pile 30B has an insertion hole 11 and a locking hole 12 that can be inserted into the other surface 3 of the lower end plate 25B by inserting the upper huge portion 22 of the connecting rod 20 of the lower pile and rotating to lock the upper huge portion 22. The latch receiving part 11 which has is formed. Moreover, the fitting groove pieces 43 and 43 which have the opening edge 46 and a wide part are formed in the side surface 4 of the lower end board 25B (FIG. 6 (a)).

(2) Lower the lower pile 30A into a predetermined pile hole by the same method as before and hold it on the ground (FIG. 6A). The upper pile 30B is lowered and the upper huge portion 22 of the connecting rod 20 of the upper end plate 25A of the lower pile 30A is inserted into the insertion hole 11 of the locking receiving portion 10 of the upper pile 30B.

  The upper pile 30B is rotated so that the opening edge 46 of the fitting groove piece 43 of the upper end plate 25A of the lower pile 30A matches the opening edge 46 of the fitting groove piece 43 of the lower end plate 25B of the upper pile 30B. In a state where the opening edges 46 and 46 of the fitting groove pieces 43 and 43 are matched, the upper huge portion 22 of the connecting rod 20 of the lower pile 30A is locked in the locking hole 12 of the locking receiving portion 10 of the upper pile 30A. (FIG. 5B). In this state, the fitting groove piece 43 of the upper pile 30B coincides with the fitting groove piece 43 of the lower pile 30A to constitute the fitting groove 49 (FIG. 6B).

  The connecting structure 33 is configured by fitting the fitting connecting member 50 having the wide portion 52 corresponding to the wide portion in the fitting groove 49 into the fitting groove 49.

(3) The connecting rod 20 in the above can also use a short steel material in which the upper bulge portion 22 and the lower bulge portion 23 are formed at both ends of the shaft portion 21 (FIG. 5). Moreover, it is also possible to use a PC steel rod 28 that is embedded in the concrete 27 of the ready-made concrete pile 25 and used for introducing prestress (FIGS. 8B to 8D). The PC steel rod 28 is extended to the front end side of the enlarging portion 29 (for fixing with the fixing hole 8 of the upper end plate 25A) (extends from the one surface 2 of the upper end plate 25A to the front end side), and the connecting rod 20 The shaft portion 21 can be formed, and the upper enormous portion 22 can also be formed at the tip (upper end) of the shaft portion (FIG. 8D). The PC steel bar 28 is integrally formed from the enormous portion 29 on the lower end side to the enormous portion 29 on the upper end side and the upper enlarging portion 22. Further, the enormous portion 29 of the PC steel rod 28 is also used as the lower enlarging portion 23 of the connecting rod 20.

  An embodiment of the present invention will be described with reference to FIGS.

        [1] Configuration of the end plate 25

(1) Fixing holes 8 and 8 for fixing enormous portions 29 at both ends of the PC steel rod 28 are formed along a circle 40 on the inner peripheral side of the steel disk 1 having a thickness t. The latch receiving portion 10 is formed along a circle 41 on the outer peripheral side of the steel disk 1. The circles 40 and 41 are arranged in the radial direction at positions that divide the width L0 of the steel disk 1 (corresponding to the thickness of the concrete of the pile) into approximately one third.

(2) one latch receiving portion 10, a steel disc 1, is bored locking hole 12 of the insertion hole 11 and the small diameter _{D 2} of the large diameter _{D 1.} The insertion hole 11 and the locking hole 12 are arranged along a circle 41, and the space between the insertion hole 11 and the locking hole 12 is cut along the diameter of the locking hole 12 and communicated via the communication portion 14. To form an integral opening (FIG. 4).

The locking hole 12 is gradually expanded (diameter D _X ) from the intermediate position within the thickness of the steel disk 1 to one surface 2 (side located on the outer surface of the pile) of the steel disk 1, etc. in concentric with the retaining hole 12 in the surface 3 (the side situated in the concrete of the pile), so that the diameter D _1, is tapered. Thus, the locking hole 12, on the one diameter D ₂ from 2 to an intermediate thickness of the steel disc 1, gradually enlarged from an intermediate thickness to the other surface 3 of the steel disc 1, other steel disk 1 in the surface 3 diameter D _1, and the has a substantially funnel-like shape.
D ₂ <D _X <D ₃

Further, the diameter D _X moiety in diameter D _X toward the insertion hole 11 side, so as to communicate with the insertion hole 11 is formed a communicating portion 14. A tapered surface extending from the edge of the intermediate thickness D ₂ to the surface 3 in the locking hole 12 is defined as a locking edge (connection guide portion) 13.

(3) Moreover, the mark 17 is formed in the predetermined position (usually on the extended line of the radius which passes along the locking hole 12) of the outer peripheral part of the steel disk 1. FIG. The mark 17 is in a state where the two steel discs 1 and 1 are brought into contact with the surface 2 and the surface 3 and the locking holes 12 and 12 communicate with each other (a state where the upper pile 31 and the lower pile 30 are connected). The steel plates 1 and 1 are formed at positions where the marks 17 and 17 of the disks 1 and 1 coincide (FIG. 3A).

(4) The end plate 25 for a ready-made pile made of concrete is formed as described above (FIG. 1). The end plate 25 is manufactured integrally. Therefore, in this end plate 25, if the shaft part and the enormous part 29 of the PC steel rod 28 and the shaft part 21 and the enormous parts 22 and 23 of the connecting rod 20 have the same structure, the cross section of the latch receiving part 10 With the same shape, one can be formed from the one surface 2 side of the steel disk 1 and the other can be formed from the other surface 3 side of the steel disk 1.

(5) In addition, the connecting rod 20 for connecting, in length L, a in diameter _D 3 of the shaft portion _{21 (D 3 <D 2)} , the upper enlarged portion 22 at both ends, the lower enlarged portion 23 (diameter _{D 4} : D ₂ <D ₄ ≦ D). The connecting rod 20 attached to one locking receiving portion 10 constitutes a locking protrusion (FIG. 5A). Both enormous portions 22 and 23 are formed in a curved taper shape such that tapered portions (connection guide portions) 22a and 23a on the shaft portion 21 side are part of a substantially spherical shape (FIG. 5A).

        [2] Configuration of ready-made concrete pile 30

  The stoppers 10 and 10 of the end plate 25 are plugged (not shown) and the end plate 25 and 25 are placed in the molding frame with the surface 3 facing inward (the upper end plate 25A, the lower end Plate 25B), PC steel bars 28 and 28, and necessary reinforcing bars are arranged, and a ready-made concrete pile 30 is constructed by centrifugal molding by a normal method. At this time, stress is introduced by a normal method. The ready-made concrete pile 30 is comprised as mentioned above (FIG. 2 (a), FIG. 5 (a)).

  Accordingly, the ready-made concrete pile 30 has a structure having an end plate 25A on the upper side and an end plate 25B on the lower side, and both ends of the PC steel rod 28 are disposed between the fixing hole 8 of the end plate 25A and the fixing hole 8 of the end plate 25B. The enormous part 29 of the part is locked. In the figure, reference numeral 27 denotes a concrete portion of the ready-made concrete pile 30.

        [3] Construction of ready-made concrete pile 30 (construction of this connection structure 33)

(1) A ready-made concrete pile 30 is buried as the lower pile 30A by a normal method and held at the opening of the pile hole.

(2) Remove the stopper attached to the locking receiving portion 10 of the end plate 25A, insert the lower enormous portion 23 of the lower end portion of the connecting rod 20 into the insertion hole 11 of the end plate 25A of the lower pile 30A, and pass through the communicating portion 14 It moves to the locking hole 12, the shaft part 21 of the connecting rod 20 is positioned in the locking hole 12, the lower enormous part 23 is positioned on the tapered locking edge 13 with the taber part 23a and the locking edge 13 as a guide. The connecting rod 20 is prevented from being pulled out. The connecting rod 20 is attached to the necessary latch receiving portions 10 (usually all the latch receiving portions 10) (FIGS. 2B and 5B). At this time, since the lower enormous portion 23 of the connecting rod 20 is positioned at the locking edge 13 and the shaft portion 21 of the connecting rod 20 is positioned at the locking hole 12, the connecting rod 20 may be detached from the locking receiving portion 10. No.

  At this time, a portion from the intermediate portion of the connecting rod 20 to the upper enormous portion 22 constitutes a locking projection.

(3) Subsequently, the upper pile 30B installed in the pile driving machine is lowered by a predetermined method (FIG. 2 (a), FIG. 5 (a)), and the lower end plate 25B of the upper pile 30B is replaced with the upper end plate of the lower pile 30A. 25A (FIG. 3 (b), FIG. 2 (b), FIG. 5 (a) chain line shown 30B). At this time, the upper huge portions 22 and 22 of the connecting rod 20 are positioned in the insertion holes 11 of the locking receiving portions 10 and 10 of the lower end plate 25B of the upper pile 30B. Further, since the latch receiving portions 10 and 10 are formed correspondingly, when the positions are aligned with one connecting rod 20, all the connecting rods 20 and 20 correspond to the corresponding latch receiving portions 10 and 10. It is inserted into the insertion holes 11 and 11. In this state, the marks 17A and 17B of the both end plates 30A and 30B do not match (FIG. 3B).

(4) Subsequently, the upper pile 30B is rotated so that the mark 17B on the lower end plate 25B of the upper pile 30B is aligned with the mark 17A on the upper end plate 25A of the lower pile 30A (FIG. 3C). By rotating the upper pile 30B and aligning the marks 17A and 17B, the tapered portion 22 of the upper enlarged portion 22 of the connecting rod 20 is guided by the tapered slope of the locking edge 13, and the axis of the connecting rod 20 The upper side of the portion 21 is positioned in the locking hole 12 of the lower end plate 25B of the upper pile 30B, and the upper enlarged portion 22 is positioned on the locking edge 13 of the lower end plate 25B of the upper pile 30B (FIG. 5B). Therefore, since it can connect automatically by rotating the upper pile 30B using the marks 17A and 17B as a clue, visual confirmation is easy.

  Thus, the connection structure 33 connecting the upper and lower piles 30B and 30A is completed. Also, once connected in this way, the shaft portion 21 of the connecting rod 20 is sandwiched between the hole walls of the locking holes 12 of the upper and lower end plates 25A, 25B, so there is no risk of shifting, but the abutted end It is also possible to perform at least one welding at the contact portion of the plates 25A and 25B. In this case, the joining can be made more reliable.

(5) Although the connecting rod 20 is attached to the locking receiving portions 10 and 10 of the upper end plate 25B of the lower pile 30B, it can also be attached to the locking receiving portion 10 of the upper pile 30B (not shown). Absent).

  Moreover, the connecting rod 20 can be fixed to the upper end plate 25A of the lower pile 30A by welding or the like in advance.

  In addition, the lower end of the guide cylinder 35 (for example, made of waterproof cardboard) is temporarily attached to the outer periphery of the upper end of the lower pile 30A, and the upper pile 30B is lowered with the inner periphery of the guide cylinder as a guide, The end plate 25B of the upper pile 30B can be placed on the end plate 25A of the lower pile 30A (FIG. 3 (a), shown by a chain line 35).

        [4] Other embodiments

(1) In the embodiment, the end plates 25 not used for connection (for example, the lower end plate 25B of the lowermost ready-made pile 30 and the upper end plate 25A of the uppermost ready-made pile 30 can be of any structure.

(2) Moreover, in the said Example, although the connecting rod 20 was comprised from the steel material which formed the enormous parts 22 and 23 in both ends, using the connecting rod 20 which formed the upper enormous part 22 only in the upper part, The shaft portion 21 of the connecting rod 20 can be welded to the locking hole 12 of the upper end plate 25A of the lower pile 30A, and the upper enlarging portion 22 of the connecting rod 20 can be arranged upward (not shown). . Also in this case, similarly, the upper enlarged portion 22 of the connecting rod 20 is locked to the locking receiving portion 10 of the lower end plate 25B. In this case, the connecting rod 20 may be a general-purpose dish-shaped bolt (having a taper formed on the shaft side of the head).

(3) Moreover, in the said Example, although the connecting rod 20 was attached to the locking hole 12 of 25 A of lower end plates, if processing, such as adhesion or welding, was carried out so that it might not remove | deviate, locking of the upper end plate B will be carried out. A connecting rod 20 can also be attached to the hole 12 (not shown).

(4) Although the tapered locking edge 13 is formed in the locking hole 12 and the tapered portions 22a and 23a are also formed on the connecting rod 20, the taber portions 22a and 23a or the tapered locking edge 13 Either one can be omitted (not shown).

(5) Moreover, in the said Example, although the fixing holes 8 and 8 and the latching receiving parts 10 and 10 were each provided along the circle | round | yen 41 of the outer peripheral side along the circle 40 of the inner peripheral side of the steel disk 1, It is also possible to form the end plate 25 by forming the fixing holes 8 and the locking receiving portions 10 alternately or in an appropriate order along one circle 42 (FIG. 8A). In this case, the lower end plate 25b has a structure corresponding to the upper end plate 25a.

(6) When the fixing hole 8 and the latch receiving portion 10 are formed around one circle 42 as in (5), the PC steel rod 28 can be processed to form the connecting rod 20. .

  That is, the lower end plate 25a is a conventional general-purpose end plate, the end plate is installed on the mold, the PC steel rod is slightly longer, the enormous portion 29 is formed at the end, Next, the shaft portion 21 of the connecting rod is formed on the distal end side, and the upper enormous portion 22 is formed on the distal end side of the shaft portion 21 (FIG. 8D). Further, in the lower end plate 25B, the fixing holes 8 and the locking receiving portions 10 similar to the above are alternately arranged, and the enormous portion 29 at the other end of the PC steel rod 28 is connected to the fixing hole 8 of the lower end plate 25B as in the conventional case. Fix (see FIG. 8B). As described above, the ready-made concrete pile 30 is manufactured using the end plates 25A and 25B.

  The connection of the upper and lower piles 30A and 30B using the ready-made concrete pile 30 is the same as that of the above embodiment, and the upper huge portion 22 of the connecting rod 20 of the upper end plate 25A of the lower pile 30A is locked to the lower end plate 25B of the upper pile. The receiving part 10 is locked and connected. In this case, since the connection rod 20 is embedded in the upper end plate 25A of the lower pile 30A in advance, the connection work can be further simplified.

  In addition, when forming the connection rod 20 in the upper end part of the PC steel rod 28, in order to make an end plate common in one ready-made concrete pile, the upper end plate 25A can also be made into the same structure as the lower end plate 25B (FIG. Not shown). In this case, the upper end plate 25A does not use the lock receiving portions 10 and 10, and is plugged if necessary (not shown).

(7) In the said Example, although the latching receiving part 10 was made into the hole penetrated to the steel disk 1, when the steel disk 1 "(end plate 25) is thick, the other surface 3 (concrete side) The cross-sectional shape may be closed (not shown).

  Next, another embodiment of the invention will be described with reference to FIGS.

      [1] Configuration of end plate 25 and ready-made concrete pile 30

  The end plate 25 of this embodiment is formed by forming fitting groove pieces 43 and 43 at predetermined positions on the side surface 4 of the steel disk 1. The fitting groove 43 has an opening edge 45 on the other surface 3 side (outer surface side) of the end plate 25, the other surface 3 side as the narrow portion 44, and the one surface 2 side (concrete side) as the wide portion 45. When the two end plates 25, 25 are brought into contact with the other surface 3 and the other surface 3, the fitting groove pieces 43, 43 have the opening edges 46, 46 of the narrow portions 44, 44 aligned with each other. The fitting groove pieces 43 and 43 are formed in such a shape and position that the fitting groove 49 is formed. In addition, two fitting groove pieces 43 are formed at regular intervals with respect to the circumference of the end plate 25, but it is usually desirable to form four or more fitting groove pieces 43 at regular intervals.

  With the other surface 2 facing outward (the opening edges 46 and 46 of the fitting groove 43 facing outward), the upper and lower end plates 25 and 25 are installed on a ready-made pile molding form, The ready-made concrete pile 30 (lower pile 30A, upper pile 30B) is manufactured (FIG. 6A).

      [2] Configuration of connecting structure 33

  The fitting connecting material 50 is formed in a front drum shape (plate shape) so as to correspond to the shape of the fitting groove 49 (two fitting groove pieces 43 and 43). That is, the fitting connecting member 50 has a narrow portion 51 at the center corresponding to the narrow portion 51 and wide portions 52 and 52 at the upper and lower end portions corresponding to the wide portions 45 and 45. is there.

  First, the lower pile 30 embedded in the pile hole is supported by the pile hole mouth, the upper pile 30A is lowered by a pile driving machine (FIG. 6A), and the lower end plate 25B of the upper pile 30B is moved to the lower pile 30A. It is placed on the upper end plate 25A (FIG. 6A, chain lines 30B and 25B). In this state, the opening grooves 46 and 46 of the fitting groove pieces 43 and 43 of the upper and lower piles 30 </ b> A and 30 </ b> B are made to coincide with each other, and the fitting groove pieces 43 and 43 are communicated to constitute the fitting groove 49.

  Subsequently, the fitting connecting members 50 and 50 are driven into the fitting grooves 49 and 49 to constitute the connecting device 33 of the present invention (FIGS. 6B and 6C). Further, the fitting groove 49 and the fitting connecting material 50 are fitted in this manner, and the upper and lower wide portions 52 and 52 of the fitting connecting material 50 are fitted into the narrow portions 44 and 44 of the fitting groove 49. The upper and lower piles 30A and 30B can be connected. In addition, since the side surfaces 4 and 4 of the end plates 25A and 25B and the surface 50a of the fitting connecting material 50 are formed substantially flush with each other, there is no step, so that the upper and lower piles 30A and 30B are being buried as in the first embodiment. The part does not hit the pile hole wall.

  In this case, if necessary, a part of the outer periphery of the fitting connecting member 50 can be welded.

      [3] Other embodiments

(1) In the embodiment, the engagement groove piece 43 is formed deeply on the other surface 3 side (concrete side) (toward the center side of the end plate 25), and the engagement bottom portion 47 having the engagement edge 48 is formed. It can also be formed (FIGS. 7A and 7B). In this case, the locking bottom portion 47 is formed like a dovetail having a wide bottom and a locking edge 48 on the opening side being narrow. The fitting connecting member 50 used in this case also forms bulging locking portions 53 and 53 at the upper and lower end portions according to the shape of the locking bottom portion 47 and having a wide distal end side and a narrow proximal end side (FIG. 7). In this case, the front shape of the fitting groove 43 and the fitting connecting member 50 can be changed from a drum shape to a rectangle (the narrow portions 44 and 51 and the wide portions 45 and 52 are eliminated) ( FIG. 7 (c)).

(2) Moreover, in the said Example, the fitting groove pieces 43 and 43 can further be formed in the side surface 4 of the end plate 25 of the said Example 1, and it can also be set as the end plate 25 (not shown). In this case, since the fitting groove 49 and the fitting connecting material 50 are further fitted in addition to the locking of the connecting rod 20 and the locking receiving portion 10, the upper and lower piles 30B and 30A are more firmly connected. The connection structure 33 can be obtained (FIG. 6A, chain line 20 shown).

  In this case, fitting groove pieces 43 and 43 are formed at the positions of the marks 17 and 17 in the first embodiment. Therefore, in the state in which the locking holes 12 and 12 of the upper and lower piles 30A and 30B are in communication (the state in which the upper pile 30B and the lower pile 30A are connected), the work of matching the opening edges 46 and 46 of the narrow portions 44 and 44 If the upper pile 30B is rotated so that the fitting groove 49 is formed by both the fitting groove pieces 43, 43, the connecting rod 20 and the locking hole 12 coincide with each other and engage simultaneously. it can. Therefore, since the fitting groove pieces 43 and 43 play the same role as the marks 17 and 17 in the first embodiment, the marks 17 and 17 can be made unnecessary.

In the embodiment of the present invention, (a) is a plan view of the upper end plate of the lower pile, (b) is a bottom view of the lower end plate of the upper pile, (c) is an enlarged view of part A of (a), (d) is ( It is the B section enlarged view of b). Similarly, it is a figure corresponding to CC sectional view of Drawing 1 (c), (a) expresses before joining and (b) expresses after joining, respectively. Similarly, in a partial perspective view, (a) shows before joining, (b) shows a contacted state, and (c) shows after joining. FIG. 4A is a plan view of the upper end plate, FIG. 5B is a sectional view taken along the line DD, FIG. 5C is a sectional view taken along the line EE, and FIG. FIG. It is an expansion longitudinal cross-sectional view before demonstrating the connection structure of this invention, (a) represents before connection, (b) represents after connection, respectively. In Embodiment 2 of the present invention, (a) is a front view before connection, (b) is a front view after connection, and (c) is an enlarged sectional view taken along line GG of (b). Similarly, in another embodiment, (a) is an enlarged longitudinal sectional view, (b) is a front view of a latch receiving portion, and (c) is a front view of another latch receiving portion. In another embodiment of the first embodiment of the present invention, (a) is a plan view of the lower end plate of the lower pile, (b) is a bottom view of the lower end plate of the upper pile of the other embodiment, and (c) is also lower. The top view of the upper end version of a pile, (d) is an expanded sectional view in the HH line of (c).

Explanation of symbols

1 Steel disk 2 One side (outside)
3 Other side (concrete side)
4 Side surface 5 Inner circumference 8 Fixing hole 10 Locking receiving portion 11 Insertion hole 12 Locking hole 13 Locking edge 14 Communication portions 17, 17A, 17B Marking 20 Connecting rod 21 Connecting rod shaft 22 Large upper portion 22a of connecting rod Taper portion 23 of upper bulge portion Lower bulge portion 23a of connecting rod Taper portions 25, 25A, 25B of lower bulge portion End plate 27 Concrete portion 28 PC steel rod 29 Enlarged portion 30, 30A, 30B of PC steel rod Ready-made concrete pile 33 Connecting structure 35 Guide cylinder 40 yen 41 yen 42 yen 43 fitting groove piece 44 fitting groove piece narrow part 45 fitting groove piece wide part 46 fitting groove piece opening edge 47 fitting groove piece locking bottom part 48 Locking edge 49 of the fitting groove piece 50 Fitting groove 50 Fitting connecting material 50a Surface 51 of the fitting connecting material Narrow portion 52 of the fitting connecting material 52 Wide portion 53 of the fitting connecting material Swelling of the fitting connecting material Locking part

Claims (7)

In the connection structure that constitutes the connection pile by connecting the both end plates by contacting the upper end surface of the end plate of the lower pile and the lower end surface of the end plate of the upper pile,
On the end face of one end plate, a locking projection having a locking portion at the tip is formed,
On the end face of the other end plate, the protrusion is inserted to form a locking recess having a locking receiving portion that can lock the locking portion,
The connection structure of the pile which formed the taper-shaped connection guide part in the edge part of the said latching | locking part and / or latching receiving part. The locking protrusion is formed into a substantially spherical locking portion by enormously forming the tip of the shaft portion,
The locking recess has a large-diameter hole that can be inserted through the locking portion and a small-diameter hole that can be inserted through the shaft portion and cannot be inserted through the locking portion in the circumferential direction.
The pile connection structure according to claim 1, wherein a locking concave portion having a connection guide portion in which the opening of the small-diameter hole is tapered is formed. The lower pile and the upper pile are concrete piles in which stress is introduced with PC steel bars arranged between the upper and lower end plates,
The connection of the pile of Claim 1 which fixed the edge of the said PC steel rod to the inner peripheral side of the said end plate, and has arrange | positioned the latching protrusion and the latching receiving part to the outer peripheral side of the said end plate. Construction. The pile connection structure according to claim 1, wherein a guide tube having an outer diameter of the upper pile or the lower pile as an inner diameter is fitted to an outer periphery of an end plate of either the lower pile or the upper pile. . A plurality of first fitting groove pieces are formed on the outer surface of one end plate, a second fitting groove piece is formed on the outer surface of the other end plate corresponding to the first fitting groove,
The connection of the pile according to claim 1, wherein a fitting connecting material is fitted into the both fitting grooves, and an outer surface of the end plate and an outer surface of the fitting connecting material are formed substantially the same. Construction. In the connection structure that constitutes the connection pile by connecting the both end plates by contacting the upper end surface of the end plate of the lower pile and the lower end surface of the end plate of the upper pile,
A plurality of first fitting groove pieces are formed on the outer surface of one end plate, and a second fitting groove piece is formed on the outer surface of the other end plate corresponding to the first fitting groove,
Matching both the fitting groove pieces, placing the upper and lower piles, fitting the fitting connecting material common to both the fitting groove pieces,
A pile connection structure, wherein a fitting connecting material is fitted into both the fitting grooves, and an outer surface of the end plate and an outer surface of the fitting connecting material are formed substantially the same. A PC steel rod that is embedded in a ready-made concrete pile and is used by extending the shaft portion to the tip side of the enormous portion for fixing with the fixing hole of the end plate of the ready-made concrete pile and connecting it to the tip of the shaft portion PC steel bar characterized by forming a huge part for use.

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