JP5775750B2 - Steel pipe concrete composite pile - Google Patents

Description

  The present invention relates to a steel-pipe concrete composite pile provided with a hiring pile part with reinforcing bars for coupling footing in the internal space on the head side of the steel-pipe concrete composite pile part, and in particular, excavation of the surrounding ground after construction is easy The present invention relates to a steel-pipe concrete composite pile that does not require chipping and is easy to manufacture.

  Steel pipe-concrete composite piles, in which a steel pipe is used as an outer shell, concrete is cast into the steel pipe and integrated by centrifugal force forming, are widely used in the fields of construction and civil engineering. When this steel-pipe concrete composite pile is used as a foundation pile, due to the connection between the pile and the footing, the steel pipe near the head of the pile is cut off and then the concrete portion is removed, and the steel pipe is placed inside the pile and inside the steel pipe. The pile and the footing are connected via the reinforcing reinforcement for footing connection by exposing the reinforcing reinforcement for the footing connection previously welded to the side surface or by welding the reinforcing reinforcement for the footing connection to the outer periphery of the steel pipe. .

  However, in the conventional steel pipe concrete composite pile, the steel pipe cutting work for cutting the steel pipe at the cut-off site and the reinforcement for the footing connection on the outer periphery of the cut-off steel pipe at the time of the work of connecting the pile and the footing There is a problem that a great amount of time and labor are required for the work for welding the reinforcing bars.

  In view of these problems, the inventors formed a concrete pile head joint on one end side and a steel pipe concrete composite part on the other end side, from the pile head joint part to the steel pipe concrete composite part. A pile having a configuration in which the concrete pile head joint portion and the steel pipe concrete composite portion are integrally formed through a plurality of reinforcing bars for connecting the footing disposed across the steel is proposed (for example, Patent Document 1). ).

  In addition, as a pile head structure of a prefabricated concrete pile that can be easily joined to the footing after construction of the foundation pile, the inventors attach a sleeve crimp screw joint to the head end plate, and attach one end to the sleeve crimp screw joint. It is a structure in which the fixed reinforcing bar is embedded in the concrete part, and after the construction, it is connected to the sleeve screw part of the sleeve crimping screw joint via the sleeve crimping screw joint on the side where the reinforcing bar for connecting the footing is connected. It has been proposed (for example, Patent Document 2). Moreover, the proposal of the pile construction jig which accommodates the reinforcing steel for footing coupling | bonding is also seen (for example, patent document 3).

  According to these proposals, it is possible to expect the effect that it is possible to easily connect reinforcing reinforcing bars of different diameters and lengths, etc. Therefore, the reinforcing bar may be damaged by the excavation work to expose the pile buried under the surface of the ground.

For this reason, there is also a proposal to form a steel pipe concrete composite pile in which a concrete part to be removed that is not covered with a steel pipe is formed continuously at one end, so that the concrete part to be removed can be easily removed after production. It is questionable to use the planned concrete part repeatedly from the viewpoint of durability (for example, Patent Document 4).

JP 2009-161996 A JP 2010-144391 A JP 2010-043471 A JP 2010-196251 A

  The present invention relates to a steel pipe cutting work for cutting a steel pipe at a cut-off site during a joining work between a pile and a footing, and a reinforcing steel bar welding for welding a reinforcing steel for joining a footing to the outer periphery of the cut-off steel pipe. Another object of the present invention is to provide a steel-pipe-concrete composite pile having a hired pile portion that can be used repeatedly without losing work and exposing a reinforcing bar for footing connection during construction.

  In order to achieve the above-mentioned object, the invention according to claim 1 of the present application is configured such that a hired pile portion having a double tube structure including an outer tube and an inner tube is provided on a head end plate of a steel tube concrete composite pile. When the lower end plate is arranged in face-to-face arrangement, the head end plate and the lower end plate are penetrated from the inside of the steel pipe concrete composite pile portion, and the outer tube and the inner tube of the hired pile portion are When the reinforcing bolt for reinforcing the footing that extends the sheath space between the top end plate protruding from the upper end plate of the hiring pile portion is fixed to the upper end plate by tightening the nut, the hiring pile portion In order to transmit the rotational force of the steel pipe concrete composite pile part, the pin hole or pin provided in the head end plate of the steel pipe concrete composite pile part, and the pin hole or pin provided in the lower end plate of the hiring pile part Consists of pins or pin holes that engage by fitting Via the coupling member, and the steel concrete composite piles, characterized in that a configuration connecting the head end plate of the employment and lower end plate of the pile section the steel concrete composite pile unit.

  In the invention according to claim 2 of the present application, the diameter of the reinforcing bar for the footing coupling is obtained by adding the reinforcing bar for the footing coupling extending through the sheath space of the hired pile part via a connecting member. It is a steel pipe concrete composite pile with a configuration that makes a reinforcing bar of a predetermined length determined according to.

  Furthermore, in the invention according to claim 3 of the present application, the reinforcing reinforcing bar for footing connection embedded in the steel pipe concrete composite pile portion is embedded at the lower end of the sleeve crimp screw joint fixed to the head end plate of the steel pipe concrete composite pile portion. When the upper end portion is fixed by screw connection, the reinforcing reinforcing bar for footing connection that extends the sheath space of the employed pile portion at the upper end of the sleeve crimp screw joint projecting inward from the lower end plate of the employed pile portion. This is a steel-pipe concrete composite pile that has a structure in which the lower end of each is fixed and connected by screw connection.

  By adopting the invention having the configuration described in claim 1, a steel pipe-concrete composite pile part integrated with an employment pile part of a double pipe structure comprising an outer cylinder pipe and an inner cylinder pipe and a reinforcing bar for footing connection is provided. When laying down to a predetermined pile head position, the reinforcing reinforcement for the footing connection is in the hiring pile portion of the double pipe structure and is located in the sheath space between the outer tube and the inner tube. The auger screw that moves up and down in the inner space of the inner tube and rotates in the left-right direction is not hit by the auger screw and is not damaged by the auger screw. Absent. Even when the surrounding ground is excavated with heavy machinery, the reinforcing reinforcing bars for coupling the footing are covered with the outer tube so that they are not damaged.

  Also, after excavation is completed, the bolt fixing at the upper end of the reinforcing bar for footing connection is released, and the hiring pile is lifted upward by a pile construction jig and separated from the steel pipe concrete composite pile. The reinforcing reinforcing bars for bonding can be exposed, and the concrete demolition work becomes unnecessary. And the above-mentioned hire pile part can be reused for reinforcing bars for footing connection of the same diameter.

  Furthermore, the lower pile opening of the horizontal L-shaped fitting groove formed on the side wall of the pile construction jig is rotated on the side of the employment pile section by rotating the pile construction jig from above with the pile construction jig. Align with the provided projection and rotate further to engage the projection at the deep part of the fitting groove, then lift the hiring pile with the pile construction jig, but rotate the construction jig In this case, the rotational force in the same direction applied to the hired pile portion is eliminated at the portion of the engaging member, and there is no adverse effect on the reinforcing reinforcement for footing connection.

  According to the second aspect of the present invention, a reinforcing bar for a footing connection having a predetermined length determined by the diameter of the reinforcing bar is obtained by adding a reinforcing bar having a desired length via a connecting member. Can be easily and freely formed. Furthermore, by setting it as the invention of the structure described in Claim 3, since it can connect via the sleeve crimped screw joint installed in the end-plate part, the reinforcing bar for footing coupling | bonding of predetermined length can be connected easily.

It is sectional drawing of the 1st Example of the steel pipe concrete composite pile concerning this invention. It is a top view of FIG. FIG. 3 is an enlarged partial sectional view taken along line III-III in FIG. 2. It is sectional drawing of 2nd Example of a steel pipe concrete composite pile same as the above. It is sectional drawing of 3rd Example of a steel pipe concrete composite pile same as the above. It is a front view which shows the construction state of a steel pipe concrete composite pile same as the above.

  Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. 1 to 3, reference numeral 1 denotes a steel pipe concrete composite pile according to the present invention. This steel pipe concrete composite pile 1 includes a steel pipe concrete composite pile part A and an employment pile part B connected to the upper part of the steel pipe concrete composite pile part A. And is composed mainly of.

  The steel pipe concrete composite pile part A is composed of a concrete layer 3 formed by centrifugal molding by placing concrete inside the steel pipe 2 as an outer shell, and this steel pipe 2 is integrated with the steel pipe 2. In the concrete layer 3, a reinforcing reinforcing bar 5-1 for footing connection is disposed in which a desired length is embedded from the head end plate 4 of the composite pile portion A toward the deeper portion below. Reference numeral 6 denotes a positioning fitting effective at the time of centrifugal molding of the reinforcing reinforcement 5 for footing connection.

  Moreover, said hiring pile part B is the thing of the double pipe structure which consists of the outer cylinder pipe 7 and the inner cylinder pipe 8, and the said hiring pile part B on the head end plate 4 of the said steel pipe concrete composite pile part A. Is installed with its lower end plate 9 placed thereon. 10 is a sheath space between the outer cylinder pipe 7 and the inner cylinder pipe 8 of the employed pile part B, and is an upper part of the reinforcing reinforcing bar 5-1 for the footing connection embedded in the steel pipe concrete composite pile part A. Passes through the head end plate 4 of the composite pile portion A and the lower end plate 9 of the hired pile portion B, respectively, and extends upward in the sheath space 10 of the hired pile portion B.

  Reference numeral 11 denotes an upper end plate of the hiring pile portion B, and an upper end of the reinforcing reinforcing bar 5-2 extending upward in the sheath space 10 is attached to a mounting hole 12 for attaching a reinforcing reinforcing bar formed on the upper end plate 11. The nut 13 is screwed to the bolt portion 5A at the upper end of the reinforcing reinforcing bar 5-2 protruding from the upper surface of the upper end plate 11, and the nut 13 is tightened to tighten the nut 13a. The upper end 5A is fixed to the upper end plate 11 of the hiring pile B. By this fixing, the steel pipe concrete composite pile portion A and the hiring pile portion B installed on top of the steel pile concrete pile portion have an integrated structure through the reinforcing reinforcing bars 5 (5-1, 5-2) for the footing connection. It becomes the steel pipe concrete composite pile 1.

  14 is a pin hole for engagement formed in the head end plate 4 in the steel pipe concrete composite pile portion A, and is constituted by a through hole as shown in FIG. 3 or a concave hole (not shown). These through holes 14 or concave holes in the pile portion A that open to the upper surface side of the head end plate 4 are formed by pressing or cutting.

  15 is an engagement pin attached to the lower end plate 9 in the hire pile portion B. As shown in FIG. 3, the base 15A of the pin 15 is in the attachment hole 9A formed in the lower end plate 9. The tip 15B of the pin 15 projecting downward from the lower surface of the lower end plate 9 is connected to the pin hole 14 for engagement formed in the head end plate 4 of the composite pile portion A. It is set as the structure which can integrally move to the circumferential direction of the composite pile part A and the hire pile part B by loosely fitting.

  As described above, the lower end plate 9 of the employed pile portion B and the head end plate 4 of the steel pipe concrete composite pile portion A are connected via the engaging member 16 including the engaging pin hole 14 and the pin 15. By connecting, all of the rotational force applied to the hired pile part B at the time of construction of the pile is transmitted to the steel pipe concrete composite pile part A at the part of the engaging member 16. Accordingly, the reinforcement pile 5 (5-1, 5-2) for the footing connection disposed across the hiring pile portion B and the steel pipe concrete composite pile portion A rotates the hiring pile portion B. The force does not act at all, and it does not have an influence.

  Reference numeral 17 denotes a connecting member, which passes through the head end plate 4 of the composite pile portion A and the lower end plate 9 of the employed pile portion B, as shown in FIG. A supplementary reinforcing bar 25B is connected via the connecting member 17 to the upper end of a reinforcing reinforcing bar 25A for a footing connection extending inward. As described above, by adding the supplementary reinforcing bars 25B having a desired length, the reinforcing reinforcing bars 5-2 for a footing connection having a predetermined length determined by the diameter of the reinforcing reinforcing bars can be easily and freely formed.

  18 is a sleeve crimp screw joint fixed to the head end plate 4 in the steel pipe concrete composite pile portion A. As shown in FIG. 5, at the lower end of the sleeve crimp screw joint 18, the steel pipe concrete composite pile portion is provided. When the upper end portion of the reinforcing reinforcing bar 5-1 for footing connection embedded in A is fixed by screw connection, the sleeve crimp screw joint 18 that penetrates the lower end plate 9 and protrudes into the hiring pile portion B is used. The lower end portion of the reinforcing reinforcing bar 5-2 for footing connection that extends the sheath space 10 of the hired pile portion B is fixed and connected to the upper end by screw connection. As described above, the reinforcing reinforcing bar 5-2 for footing coupling having a predetermined length can be connected via the sleeve crimping screw joint 18 of the end plates 4 and 9, so that the connection is facilitated.

  Reference numeral 19 denotes a construction jig for the steel pipe concrete composite pile 1, which is used by being fitted on the hiring pile part B, and above the construction jig 19, the hiring pile part B via the hiring pile part B. The steel pipe concrete composite pile 1 is each provided with the raising / lowering operation body which carries out raising / lowering operation, and the rotation operation body which carries out rotation operation (not shown).

  Reference numeral 20 denotes a fitting groove, which includes a vertical groove portion 21A extending upward from the lower end edge of the construction jig 19 and a horizontal groove portion 21B extending in the circumferential direction from the upper end of the vertical groove portion 21A. The construction jig 19 is integrated with the projecting portion 7A provided on the outer peripheral surface, and the construction jig 19 is separated from the pile part B by removing the fitting. .

  Next, the operation of the steel pipe concrete composite pile according to the present invention will be described. When constructing the steel pipe concrete composite pile 1 having the structure as shown in FIGS. 1 to 5, the construction jig 19 is placed on the head of the employed pile part B from above, and the longitudinal groove part of the fitting groove 20 21A is hired and aligned with the protruding portion 7A provided on the outer peripheral surface of the pile portion B. Next, the projection jig 7A is relatively inserted into the longitudinal groove portion 21A by lowering the construction jig 19 with a lifting operation body (not shown), and the construction jig 19 is rotated with a rotation operation body (not shown). Thus, the protruding portion 7A is inserted into the lateral groove portion 21B.

  Here, the projecting part 7A can be removed from the fitting groove 20 by rotating and raising the construction jig 19 in the opposite direction, but in the steel pipe concrete composite pile 1, the steel pipe concrete is provided. The composite pile part A will receive the rotational force of the construction jig 19 through the hired pile part B, and the reinforcing reinforcing bar 5 for the footing connection disposed across the pile parts A and B. (5-1, 5-2) also receives the rotational force. However, when the construction jig 19 is rotated, the rotational force in the same direction acting on the hired pile portion B is eliminated at the engaging portion of the engaging member 16, and the reinforcing reinforcing bar 5 for the footing connection No rotational force acting on the hired pile portion B is transmitted, and there is no adverse effect on the reinforcing reinforcement 5 for footing connection.

  Next, the steel pipe concrete composite pile which consists of the hiring pile part B of the double pipe structure which consists of the outer cylinder pipe 7 and the inner cylinder pipe 8, and the steel pipe concrete composite pile part A integrated through the reinforcing bar 5 for a footing connection. When laying 1 so as to be at a predetermined pile head position, the reinforcing reinforcing bar 5 (5-2) for the footing connection is in the hiring pile portion B of the double pipe structure, Since it is located in the sheath space 10 between the tubular tube 8, it does not collide with an auger screw (not shown) that moves up and down in the internal space 8A of the inner tubular tube 8 by the rotary operation body and rotates in the left-right direction. , Will not be hurt.

  Further, it is not deformed by the earth and sand that is moved up and discharged in the steel pipe concrete composite pile 1 by the auger screw. Moreover, even when excavating the surrounding ground of the steel pipe concrete composite pile 1 with a heavy machine, since the reinforcing reinforcement 5 for footing coupling | bonding is coat | covered with the outer cylinder pipe 7, it will not be damaged.

  As described above, the steel pipe-concrete composite pile 1 is sunk to a predetermined position, and when excavation is completed, the nut is located in the reinforcing bar 5 (5-2) for footing connection and screwed to the bolt part 5A at the upper end. 13 to cancel the fixing. Next, the hiring pile part B is pulled upward by the lifting operation through the pile construction jig 19, and the hiring pile part B is reinforced with reinforcing steel bars for footing connection in the steel pipe concrete composite pile part A and the hiring pile part B. Separate from each. As a result, the reinforcing reinforcing bar 5 (5-2) for the footing connection in the hired pile portion B can be exposed, and the concrete demolition work becomes unnecessary. And this hire pile part B can reuse this for the reinforcing reinforcement for a footing coupling | bonding of the same diameter.

DESCRIPTION OF SYMBOLS 1 Steel pipe concrete composite pile 2 Steel pipe 3 Concrete layer 4 Head end plate 5 Reinforcement reinforcing bar 5A Same bolt part 7 Outer cylinder pipe 7A Protrusion part 8 Inner cylinder pipe 9 Lower end plate 9A Mounting hole 10 Sheath space 11 Upper end plate 12 Installation Hole 13 Nut 14 Pin hole 14A Through hole 15 Pin 15A Base 15B Tip 16 Engaging member 17 Connecting member 18 Sleeve crimp screw joint 19 Construction jig 20 Fitting groove 21A Vertical groove 21B Horizontal groove

Claims (3)

When the steel pile concrete composite pile pile is placed on the head end plate of the double pipe structure consisting of an outer tube and an inner tube with its lower end plate in contact, the steel pipe concrete composite pile The employment pile of the reinforcing steel bar for reinforcing the footing that penetrates the head end plate and the lower end plate from the inside of the part and extends the sheath space between the outer cylinder pipe and the inner cylinder pipe of the employment pile part. When the distal bolt portion protruding from the upper end plate parts allowed to fixing on the upper end plate by a nut tighteningゝmonitor, for transmitting a rotational force of the hired pile portion on the steel concrete composite pile portion, the steel pipe concrete composite Via an engaging member consisting of a pin hole or pin provided in the head end plate of the pile portion and a pin or pin hole engaged by fitting with the pin hole or pin provided in the lower end plate of the hire pile portion the steel pipe conc and the lower end plate of the employment pile portion Steel concrete composite piles, characterized in that a configuration connecting the head end plate over preparative composite pile unit. By reinforcing the reinforcing reinforcement for footing connection extending in the sheath space of the hiring pile part via a connecting member, the reinforcing reinforcing bar has a predetermined length determined according to the diameter of the reinforcing reinforcing rod for the footing connection. The steel pipe concrete composite pile according to claim 1 , wherein the steel pipe concrete composite pile is configured. When the upper end of the reinforcing reinforcement for footing connection embedded in the steel pipe concrete composite pile part is fixed to the lower end of the sleeve crimp screw joint fixed to the head end plate of the steel pipe concrete composite pile part by screw connection, A structure in which a lower end portion of a reinforcing bar for a footing connection extending the sheath space of the employment pile portion is fixed and connected to an upper end of the sleeve crimp screw joint protruding inward from a lower end plate of the employment pile portion by screw connection. The steel pipe concrete compound pile according to claim 1 or 2 characterized by things.

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