JP2018178366A - Precast concrete beam member connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a beam main reinforcement to be quickly and definitely connected in an on-site connection work of precast concrete members.SOLUTION: In a precast concrete beam member connection method, precast concrete beam members A and B are connected by: making screw-knotted reinforcement 22 protrude in a concave part at a position to arrange the screw-knotted reinforcement 22 on a beam end surface of the beam member B; orienting a first beam end joint part at which protruding screw-knotted reinforcement 22 is screwed with a reinforcement joint coupler 10 and held in the concave part, and a second beam end joint part at which a joint reinforcement 21 protrudes in a concave part including the joint reinforcement 21 of the beam member A to be connected with the beam member B so as to face each other; and moving a part of the reinforcement joint coupler 10 from the concave part of the beam member B to a position where the joint reinforcement 21 of the beam member A is stored inside. The beam member A and the beam member B are connected with each other by filling a hardener in the concave parts of the first beam end joint part and the second beam end joint part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of joining precast concrete beam members, and more particularly to a method of joining precast concrete beam members in which main bars can be joined quickly and reliably when joining beams composed of precast concrete members constituting a frame of a building.

  Conventionally, when constructing a rigid frame structure consisting of reinforced concrete columns and beams from precast concrete members, both reinforcing bars and concrete are rigidly connected in order to construct an integral frame structure at the beam-to-column joints and joints between beams. There is a need to. In particular, in the joint of the beam member, when the joint of the reinforcing bars is a lap joint or a mechanical joint, the concrete portion needs to be subjected to a field punching operation over a range longer than a predetermined joint length in consideration of workability. In this cast-in-place concrete work, a series of works such as reinforcement work, formwork work, concrete placing work, and demolding work occur, so the merit of speeding up construction using precast concrete members is reduced. There is.

  Patent Document 1 has been proposed as a joint structure capable of reducing the labor of on-site punching work of joint concrete as described above. In the invention disclosed in the third embodiment of Patent Document 1, an outer pipe capable of accommodating the entire sleeve joint is disposed on the side surface of the joint end of the beam, and the ends of the joint reinforcing bars facing each other in the outer pipe Expose the sleeve, attach the sleeve joint to one of the reinforcing bars, combine the beams, move the sleeve joint from the outer pipe to the position straddling between the opposing reinforcing bars, with the jointed reinforcing bars facing each other, into the outer pipe The grout is filled to integrate the beam joint.

  In the invention disclosed in the third embodiment of the patent document 1, in order to move the sleeve joint from the outer pipe to the beam joining position, the string-like body is attached to the back side of the sleeve joint and the string-like body is By operating from the outside of the beam, the sleeve joint is pulled out of the outer pipe. In order to realize this drawing operation, it is necessary to make the inner diameter of the sleeve joint sufficiently larger than the diameter of the joint reinforcing bar to provide a sufficient clearance between the joint joint and the reinforcing bar to allow the joint reinforcing bar to be loosely fitted. However, if the clearance between the inner circumferential surface of the sleeve joint and the joint reinforcing bar is large, centering of the sleeve joint can not be performed, and positioning when inserting the sleeve joint into the facing joint reinforcing bar may become difficult.

JP 2008-69591 A JP 2008-63730 A

  The prior art which enabled centering of a sleeve joint to be able to be performed reliably is indicated by patent documents 2 (the following numerals are according to patent documents 2). In the prior art disclosed in FIG. 9 of Patent Document 2, a half sleeve 34 having a screw fixing portion 32 and a mortar fixing portion 33 in order to connect two rebars 31A and 31B serving as column main bars vertically. And a lock nut 35 for fixing one of the reinforcing bars 31A to the sleeve. An inner surface of the screw fixing portion 32 is formed with a threaded reinforcing bar (reinforcing bar 31A) and a female screw capable of being screwed with the lock nut 35 as illustrated.

  This half sleeve 34 is fixed by using a lock nut 35 at the end of the threaded reinforcing bar (reinforcing bar 31A) for the purpose of rationalizing the joining work of the erected reinforcing bars themselves like a column main bar etc. It is not intended to solve the problems of the prior art for cast-in-place concrete operations at beam joints, which consists of a construction used for reinforcing bar joints and which Patent Document 1 tries to solve.

  Therefore, an object of the present invention is to solve the problems of the above-mentioned prior art and to rationalize the joint work of the main bars of the beam by the method for joining precast concrete beam members of the present invention.

  In order to achieve the above object, the present invention is a joining method of joining a beam end of one beam member made of precast concrete and a beam end of another beam member, and the beam end surface of the one beam member A recess is formed at the arrangement position of the joint rebar consisting of the threaded joint bars, and the joint rebar is protruded to the vicinity of the beam end face in the recess, and the mechanical joint is screwed to the protruded joint rebar. A recess is formed at a position including the joining rebar of the beam end face of the other beam member which is accommodated in the space to form a first beam end joint and which is linearly arranged and joined to the one beam member, In the recess, the connection reinforcing bar is protruded to the vicinity of the beam end face to form a second beam end joint, and the beam end face of the first beam end joint and the second beam end joint are opposed to each other. Part of the joint from inside the recess of the one beam member to the inside of the joint reinforcing bar of the other beam member The first beam end joint portion and the second beam end joint portion opposite to the mechanical joint are filled with a hardening material, and the one beam member and the other are moved. And the beam member of

  The recess preferably has a substantially cylindrical shape having an inner diameter slightly larger than the outer diameter of the mechanical joint, in which the joint reinforcing bar is disposed at a cross-sectional center position.

  It is preferable that the mechanical joint is moved to the other beam member side by rotating around the joint reinforcing bar in a state of being screwed to a threaded portion of the joint reinforcing bar of the one beam member.

  It is preferable that the mechanical joint has a part of joint reinforcing bars of the other beam members loosely fitted therein after being moved.

  According to the present proposal, by improving the joining operation between reinforcing bars in the conventional joining work of precast concrete beam members, it is possible to largely omit the form work and the reinforcing bar construction at the beam joint, thus streamlining the operation The effect of being able to

The fragmentary sectional view which showed the junction part of the beam end member made from precast concrete and the beam member joined by the joining method of the precast concrete beam member of this invention. The expanded sectional view which showed the beam connection part shown in FIG. 1, and the end elevation of a beam connection surface. The expanded sectional view which showed the state which the rebars were joined by the rebar joint coupler, and the surroundings and between beams were grout-filled. The front view which showed the structure of the rebar joint coupler used by this invention, Each part sectional drawing. State explanatory drawing which showed the working state (at the time of beam member suspension) of beam joining. State explanatory drawing which showed the working state (at the time of installation completion of a beam member and a beam end member) of beam joining. State explanatory drawing which showed the operation | work state (at the time of completion | finish of rebar joint coupler movement) of beam joining. State explanatory drawing which showed the working state (at the time of grout filling completion) of beam joining. State explanatory drawing which showed the operation state (at the time of beam end member suspension) of the beam connection at the time of building construction. State explanatory drawing which showed the operation state (at the time of beam end member installation completion) of the beam connection at the time of building construction. State explanatory drawing which showed the operation state (at the time of beam member suspension) of the beam connection at the time of building construction. State explanatory drawing which showed the operation | work state (at the time of grout filling completion and the time of suspension of the pillar member of the upper floor) of the beam connection at the time of building construction.

Hereinafter, the joining method of the precast-concrete beam member of this invention is demonstrated with reference to an accompanying drawing.
FIG. 1 shows a precast concrete beam end member A (hereinafter referred to as a beam end member A) and a precast concrete beam member B (hereinafter referred to as a beam member B and the like) constructed by the joining method of precast concrete beam members of the present invention. It is a fragmentary sectional view showing the state of junction with. In the drawing, the beams are shown in cross section so that the configurations of the beam end members A, the arrangement of the beam inside of the beam members B inside the beams, and the beam joint portion can be understood. This beam-to-column connection will be described with reference to FIGS. 9 to 12, but at the top of the erected precast concrete column C, the beam ends so that the beam passes through the column. The member A is integrally constructed on site. In addition, in the same figure, the shear cotter 2 of a different shape is formed in the joint surface of the beam end surface of the both sides of the beam end member A as a reference example.

  2 is a partial enlarged cross-sectional view showing a joint between the beam end member A shown in FIG. 1 and a beam member B installed between adjacent columns (not shown). It is. In the figure, on the joint surface of the beam end member A on the left side of the column and the beam member B, a curved surface-shaped shear cotter 2 in which the beam member B side is concave and the beam end member A is convex is formed over the entire beam width. (FIG. 2 (a), (b)). On the beam end member A and the beam member B beam joint surface on the right side of the column, there is formed a square-shaped shear cotter 2 in which a part of the end surface of the beam member B side and the beam end member A both has a concave shape (FIG. 2 (C), (d). As is apparent from FIG. 2, each of four main beam bars 21 and 22 is disposed at the upper and lower ends of the cross section of the beam as an example, and the shear reinforcement bars 3 surrounding these main beams are predetermined in the beam axial direction It is arranged at intervals. Furthermore, a predetermined number of shear reinforcing bars 3 are also arranged in the area of the joint.

  Hereinafter, the configuration of the joint of the beam end member A and the beam member B, the configuration of the rebar joint coupler 10 used in the joint, and the joining procedure of the joint rebar using the rebar joint coupler 10 will be described with reference to FIG. This will be described with reference to FIG. FIG. 3 is an enlarged cross-sectional view showing the joint between the beam end member A and the beam member B facing each other. In the figure, grout G is filled around the clearance 5 between the beam end member A and the beam member B and the joint rebar contained in the rebar joint coupler 10, and the beam joint is completed.

  Here, the configuration of the reinforcing bar joint coupler 10 for joining the reinforcing bars at the end portions of the beam main bars of the beam end member A and the beam member B will be described with reference to FIGS. Each figure of FIG. 4 shows the external appearance and the configuration of each part of the rebar joint coupler 10 of the present invention.

  The reinforcing bar joint coupler 10 used in the method for joining precast concrete beam members according to the present invention has a cylindrical shape having two types of outer diameters, as its external shape is shown in FIG. In the embodiment, the ratio (d1: d2) of the lengths of the large diameter portion 11 (cylindrical portion having a large outer diameter) and the small diameter portion 12 (a cylindrical portion having a small outer diameter) is approximately 3: 1. FIG. 4 (b) shows the vertical cross section of the reinforcing bar joint coupler 10. As shown in the figure, the large diameter portion 11 has a cylindrical shape having a smooth inner circumferential surface. At the time of beam connection, a reinforcing bar end (hereinafter referred to as a connecting rebar 22) of the main beam 22 of the beam B is inserted and accommodated in the internal space 13 by a predetermined length (see FIG. 3).

  The large diameter portion 11 is formed with a filling hole 14 and a discharge hole 15 of grout G which communicate the outer peripheral surface of the reinforcing bar joint coupler 10 with the internal space 13. As shown in FIGS. 4B and 4C, the filling holes 14 and the discharging holes 15 are arranged in the same plane in the upper and lower relationship. For this reason, the grout G filled in the inner space 13 of the reinforcing bar joint coupler 10 from the lower filling hole 14 is surely filled up to the upper surface of the accommodated joint rebar 22 as shown in FIGS. 3 and 4. Thereafter, the surplus is discharged from the discharge hole 15 located on the upper side of the internal space 13. Further, a seal packing 18 is attached to the open end where the joint rebar 22 is inserted, and the grout G can be prevented from leaking from the open end. Thus, as shown in FIG. 3, the bonded reinforcing bars accommodated in the large diameter portion 11 function as a grout-filled joint having sufficient joint strength due to the grout G filled in the rebar joint coupler 10.

  A band-like marking portion 19 is provided at a predetermined position on the outer peripheral surface of the large diameter portion 11 of the reinforcing bar joint coupler 10. In this embodiment, the marking portion 19 is, for example, a paint having a high visibility such as yellow or a color such as fluorescent color, and as shown in FIG. When joining together, it is used in order to check the clearance 5 between beams, and to confirm that the proper amount of jointing rebars 21 and 22 are inserted into the rebar joint coupler 10.

  On the other hand, as shown in FIGS. 4B and 4D, a female screw 12a is formed on the inner peripheral surface of the small diameter portion 12. The female screw portion 12a has a thread shape, a lead, and the like which can be screwed with the male screw 22a (FIG. 3) of the threaded joint rebar used as the joint rebar 22. The rebar joint coupler 10 is held by the joint rebar 21 by being screwed into the tip position of the joint rebar 21 made of threaded joint bars as shown in FIG. Further, as shown in FIGS. 4B and 4D, an angular groove 12b as a grout communication groove extending in the axial direction is formed at the top of the inner peripheral surface of the female screw 12a. The angular groove 12 b is formed to communicate the internal space 13 of the large diameter portion 11 with the open end of the small diameter portion 12. As described above, when the grout G is filled from the filling hole 14 (FIG. 3), the grout G penetrates into the gap of the threaded portion of the joint bar 21 of the small diameter portion 12 through the angular groove 12b and is discharged to the open end As a result, the joint rebar 21 consisting of a threaded joint rebar screwed to the rebar joint coupler 10 is fixed to the rebar joint coupler 10 more firmly by the grout G filled in the gap of the screw portion.

  Here, the operation | work procedure which performs beam joining using the reinforcement joint coupler 10 mentioned above is demonstrated with reference to FIGS. 5-8. FIG. 5 shows the rebar joint coupler 10 screwed to the joint rebar 22 in the substantially cylindrical recess 6 in which the position of the joint rebar 22 formed on the end face of the beam end member A is located substantially on the central axis. Indicates the state of being housed. At this time, the end of the joint rebar 22 projecting into the recess 6 extends near the opening end of the recess 6. From this state, the beam member B is suspended at a position where a predetermined clearance 5 is opened from the joint end surface of the beam end member A supported at the beam installation position (FIGS. 5 to 6). The joint end face (FIG. 5 (a), (b)) of the beam member B faces the joint end face (FIG. 5 (c)) of the beam end member A in which the rebar joint coupler 10 is accommodated in the recess 6. A substantially identical recess 7 is formed which is shorter in depth and depth than the recess 6 of the end member A, and the end of the joint rebar 21 extends to the vicinity of the open end. Preferably, the shapes of the recesses 6 and 7 are set so that the inner diameter at the opening end side is slightly larger than the inner diameter of the rear portion.

  Next, a rotating jig (not shown) or a hand is inserted from the outside of the beam into the clearance 5 between beams from the state shown in FIG. 10 from the state accommodated in the recess 6 on the beam end member A side to the position where the marking portion 19 (FIG. 4) can be visually recognized from the clearance 5 along the reinforcing bar axial direction into the recess 7 on the beam member B side Let it happen (Figure 7). It can be confirmed that the joint rebars 21 and 22 are accommodated in the rebar joint coupler 10 with a proper insertion amount in a state where the marking portion 19 can be visually recognized from the clearance 5. Thereafter, grout G is filled in the coupler 10 using the filling holes 14 (FIG. 4) of the reinforcing bar joint coupler 10, and then the clearance 5 between the beam end member A, the recess 6 and 7 of the beam member B and the beams Grout G is filled to complete the joining operation of the beam end member A and the beam member B (FIG. 8).

  The example of the method of joining beams described above will be described with reference to FIGS. 9 to 12 as an example of construction of a precast concrete building constructed by joining a precast concrete column member, a beam end member A, and a beam member B.

  FIGS. 9-12 mounts the center position of the precast-concrete beam end member A (beam end member A) on a precast concrete column member C (hereinafter referred to as a post member) erected adjacent to a slab of a predetermined floor The supporting procedure is shown and the joining procedure of the beam connection part of the beam end member A and the beam member B installed between pillars is shown. FIG. 9 shows a working state in which the beam end member A having a joint with the beam member B formed at both ends of the beam end member A is installed and fixed to the top end of the column member C. A through hole 9 is formed at the center position of the beam end member A corresponding to the position of the column main bar 8 of the column member C which has already been erected, and the column main bar 8 is inserted through the through hole 9 A can be integrated by suspending A at the top end of the column member C and mounting and fixing the beam end member A at the top end of the column C (FIG. 10).

  In the state shown in FIG. 10, the vicinity of the joint of the beam end member A is supported by the supporting support S, and the rebar joint coupler 10 is accommodated in the recess 6 at the beam main bar position of the joint end. FIG. 11 shows the beam member B (displayed partially) suspended at the left joint of the beam end member A and the beam member B (displayed partially) at the right joint of the beam end member A in the vertical direction It shows a suspended state. As described above, when the beam member B is suspended at a predetermined beam installation position, the beam member B can be suspended without moving in a horizontal direction, and work efficiency can be improved.

  FIG. 12 shows the inside of the rebar joint coupler 10 after moving the rebar joint coupler 10 accommodated in the recess 6 of the joint end face of the beam end member A by a predetermined amount into the recess 7 on the joint end face side of the beam member B. Grout G is filled in the clearance between the beam end member A and the beam member B, and shows the progress of curing of the grout G. At this stage, the pillar member C on the upper floor can be suspended in the pillar main reinforcement 8 projecting from the upper surface of the beam end member A. By thus joining the beams A installed between the columns using the present joining method at the beam end position, it is possible to integrally complete the frame and slab of the building sequentially. A series of operations can be rationally performed by quick and reliable rebar connection operations without formwork operations.

  In the above explanation, the beam end member A is placed on the top of the precast concrete column member C, and the construction procedure for joining the beams in the vicinity of the columns has been described. You can also. In this case, a long beam member B having a length up to the center of the beam span between the columns is mounted and fixed to the precast concrete column member. And it joins with the beam member B mounted in the adjacent pillar in the center position of beam span. As a result, it is possible to reduce the number of beam connection points and to shorten the total work time of beam connection.

  The present invention is not limited to the embodiments described above, and various modifications within the scope of the claims are possible. That is, an embodiment obtained by combining technical means appropriately modified within the scope of the claims is also included in the technical scope of the present invention.

5 Clearances 6 and 7 Recesses 10 Reinforcement couplers 21 and 22 Beam main bars (joint reinforcement)
A Beam end member B Beam member C Column member G Grout

Claims (4)

A joining method for joining a beam end of one beam member made of precast concrete and a beam end of another beam member,
A recess is formed in the arrangement position of the connecting rebar consisting of threaded joint bars of the end face of the beam of the one beam member, and the connecting rebar is protruded to the vicinity of the end face of the beam in the recess, and the protruding connecting rebar is mechanical A joint is screwed and accommodated in the recess to form a first beam end joint,
A recess is formed at a position including joining reinforcing bars of the beam end face of the other beam member linearly arranged and joined to the one beam member, and the joining reinforcing bar is protruded to the vicinity of the beam end face in the recess As a second beam end joint,
The beam end face of the first beam end joint and the beam end joint of the second beam end face each other, and a part of the mechanical joint is joined to the reinforcing bar of the other beam member from the inside of the recess of the one beam member. Is moved to a position where the first beam end joint facing the interior of the mechanical joint and a recess in the second beam end joint are filled with a hardening material, and A method of joining precast concrete beam members, comprising joining a beam member and another beam member.   The method for joining precast concrete beam members according to claim 1, wherein the recess has a substantially cylindrical shape having an inner diameter slightly larger than the outer diameter of the mechanical joint, in which the joint reinforcing bar is disposed at a cross-sectional center position.   The precast according to claim 1, wherein the mechanical joint is moved to the other beam member side by being rotated around the joint reinforcing bar in a state of being screwed to the threaded portion of the joint reinforcing bar of the one beam member. How to join concrete beam members.   The method for joining precast concrete beam members according to claim 1, wherein the mechanical joint allows a part of the joint reinforcing bars of the other beam members to be loosely fitted therein at a position after movement.

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