JP6132124B2 - Precast concrete column beam joining method - Google Patents

Description

The present invention relates to a method for joining precast concrete column beams .

  Conventionally, as a precast concrete (PC) column beam joint structure, a through hole is provided in one end surface of a PC member such as a PC beam or a PC column, or a joint metal such as a mechanical joint is embedded, and the joint metal There is known a construction method in which a reinforcing bar protruding from the other end surface of the PC member is pierced and joined (see, for example, Patent Document 1).

  Patent Document 1 discloses a PC beam in which an end of a beam main bar protrudes from the end surface in a horizontal direction, a column main bar, and a column main bar coupling joint embedded in at least the upper end of the column main bar. And a PC joint panel having a vertical through-hole for inserting the column main reinforcement and a joint for connecting the beam main reinforcement, and the end of the beam main reinforcement from the PC beam is the beam main reinforcement. A column reinforcing bar is inserted from above into the column main reinforcement hole that is inserted into the hole and connected by a joint, and its lower end is connected to the column main reinforcement of the PC column on the lower floor, and the upper end is connected to the column main reinforcement on the upper floor. Thus, a configuration is disclosed in which a PC column and a PC beam are joined by a joint panel member that is a PC member.

Japanese Patent No. 3837390

However, the conventional PC column beam joint structure described above has the following problems.
That is, in the case of a general PC beam or a PC member such as a PC column, it is manufactured in a state where the reinforcing bars protrude from the end faces thereof. Also in Patent Document 1, the upper end portion and the lower end portion of the relay bars inserted into the PC joint panel are in a state of protruding from the PC joint panel. Therefore, it is necessary to protect the reinforcing bars protruding from the PC member from interfering with other parts and people during the lifting and transporting operation of the PC member during construction, and there is room for improvement in that respect.

The present invention has been made in view of the above-described problems, and by eliminating or reducing the protrusions of the PC member during lifting or transporting, it is possible to reduce the effort required to protect the protrusions. It aims at providing the joining method of the precast concrete column beam which can aim at efficiency improvement.

In order to achieve the above object, in the method for joining precast concrete column beams according to the present invention, a precast comprising a column portion and a beam portion projecting from the column portion, and having a plurality of through holes penetrating vertically in the column portion. Precast concrete comprising: a concrete (PC) beam; a precast concrete (PC) column having a column main reinforcement hole to be connected to a column portion of the PC beam on upper and lower connection end surfaces; and a column main reinforcement that can be inserted into the through hole. A method for joining column beams, wherein a reinforcing bar unit in which a plurality of column main bars are integrally fixed is used, and the column main bars are not protruded from the lower end surface of the column part. A step of fixing the reinforcing bar unit to the column portion in a state of being inserted into the column portion, and the column of the reinforcing bar unit when the column portion of the PC beam is placed on the PC column. A step of releasing the fixed state of the bar, a step of inserting and fixing the protruding end of the column main bar of the reinforcing bar unit penetrating the through hole into the column main bar hole of the PC column; A step of inserting a separate connecting joint into a beam main reinforcement hole provided in a joint end face of the beam portion of the PC beam mounted, and a protruding end protruding from the joint end face of the separate connecting joint And a step of inserting a beam main reinforcement hole provided in a joint end face of a beam portion of another PC pillar.

In this invention, the reinforcing bar unit inserted in the through-hole provided in the column part of PC beam can be supported with respect to the column part so that the lower end of the column main reinforcement does not protrude from the lower end surface of the column part. Therefore, when joining a PC beam on a PC column installed in advance, the column main bar protrudes from the lower end surface of the column part of the PC beam even if it is equipped with a reinforcing bar unit for the PC beam to be lifted. It becomes possible to make it the state which does not. When the PC beam is placed at a predetermined position on the joint end surface of the PC column, the supporting state of the reinforcing bar unit is released, so that the column main bar protrudes from the lower end surface of the column part, and the lower end of the column main bar Is inserted into the main column hole of the PC column and fixed, whereby the PC column and the PC beam are joined.
The PC column has a configuration in which column main muscle holes are provided on the upper and lower joining end surfaces and there is no protrusion. On the other hand, the PC beam only needs to incorporate the reinforcing bar unit into the PC beam only when the PC beam is joined to the PC column, and when the reinforcing bar unit is not provided, there is no protruding portion. Therefore, even if it is in the state provided with the reinforcing bar unit at the time of lifting, it will be in the state where there is no projection part at least in the lower end surface of a pillar part. Therefore, it is possible to reduce time and effort required to protect the protruding portions of PC members such as PC beams and PC columns.
As a result, only the beam main reinforcement hole is provided in the joint end face of the beam portion, and when the beam portion of the other PC beam is joined to the beam portion of the one previously installed PC beam, After the connecting joint bars are attached to the main beam holes of the beam, the main beam holes of the beam portion of the other PC beam are inserted into the connecting joint bars protruding from the joint end face, thereby joining the PC beams. In other words, the PC beam that is lifted at the time of joining has no protrusion on the joint end face of the beam part in addition to the lower end face of the column part, so that it is possible to reduce the effort required to protect the protruding part of the PC member. .

According to the precast concrete column beam joining method of the present invention, it is possible to reduce the effort required to protect the protruding portion by eliminating or reducing the protruding portion of the PC member at the time of lifting or transporting, and the efficiency of construction. Can be achieved.

It is a disassembled perspective view which shows the structure of the column beam junction structure by embodiment of this invention. It is a perspective view which shows the structure of PC beam. It is a front view which shows the joining end surface in the beam part of the PC beam shown to a figure. It is a perspective view which shows the PC beam of another structure. It is a longitudinal cross-sectional view which shows the structure of PC pillar. It is a perspective view which shows the structure of a main muscle restraint member. It is AA sectional view taken on the line shown in FIG. 6, Comprising: It is a longitudinal cross-sectional view of a main reinforcement restraining member. It is the figure which looked at the main muscle restraint member shown in FIG. 7 from the top. It is a longitudinal cross-sectional view explaining the effect | action of a main reinforcement member, Comprising: (a) is a figure which shows the state before fall of a column main reinforcement, (b) is a figure which shows the state after fall of a column main reinforcement. (A)-(c) is a figure which shows the construction procedure of a column beam junction structure. (A)-(c) is a figure which shows the construction procedure of a column beam junction structure. (A)-(c) is a figure which shows the construction procedure of a column beam junction structure. (A), (b) is a figure which shows the construction procedure of a column beam junction structure. It is a top view of the construction state shown in FIG.13 (b).

Hereinafter, a method for joining precast concrete column beams according to an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a precast concrete column beam joint structure (hereinafter referred to as a column beam joint structure 1) according to the present embodiment includes a precast concrete (PC) beam 10 and a precast concrete (PC) column 20. It joins with the reinforcing bar unit 30 which was inserted in the pillar 20 and integrated several pillar main reinforcement 31,31, .... The PC beams 10 and 10 are joined to each other via a connecting joint 11 connected to a beam end portion (joint end surface 13b of the beam portion).
Here, FIG. 1 shows a state in which the beam-column joint structure 1 is disassembled, and the beam-column joint structure 1 is completed by installing each member in a direction indicated by an arrow in the drawing.

  As shown in FIGS. 1 and 2, the PC beam 10 includes a column portion 12 having an upper end surface 12b and a lower end surface 12c joined to the PC column 20, and a beam portion 13 (from the left and right sides sandwiching the column portion 12). The first beam portion 13A and the second beam portion 13B) are integrated with each other.

  The column part 12 is formed in a rectangular parallelepiped shape, and is provided with a plurality of through holes 12a penetrating in the vertical direction. The through-hole 12a has a hole diameter through which the columnar main bar 31 can be inserted. The column main bars 31 constituting the reinforcing bar unit 30 are protruded from both the upper end surface 12b and the lower end surface 12c of the column part 12 at a predetermined joint position with respect to the PC column 20, and the protruding ends 31a and 31b of the column main bars 31 are formed. Connected to the PC pillar 20.

  The beam portions 13A and 13B have the beam main reinforcement 14 embedded therein, have a length dimension that is substantially half (1/2) of the span length of the frame, and the first beam portion 13A of one PC beam 10 and the other PC. By joining the second beam portion 13B of the beam 10, a beam for one span is formed between the column portions 12 and 12 (see FIGS. 13B and 14). The length dimension of the beam portions 13A and 13B is not limited to approximately half of the span of the frame, and can be set to an appropriate length.

  As shown in FIGS. 2 and 3, a beam main reinforcement hole 13 a into which a separate connecting joint 11 (FIG. 1) can be inserted in the protruding end portion (joint end surface 13 b) of the beam portion 13 in a cross-sectional view. 14 is provided at the same position. The beam main reinforcement hole 13a uses a sheath tube, and is joined to the beam main reinforcement 14 and the connection joint reinforcement 11 inserted into the beam main reinforcement hole 13a is connected to the beam main reinforcement 14 through the beam main reinforcement hole 13a. Has been. The connecting joint bar 11 is a reinforcing bar for connecting the beam portions 13A and 13B of the adjacent PC beams 10 and 10, and the other half is inserted in the beam main bar hole 13a in a state in which approximately half in the length direction is inserted into the beam main bar hole 13a. Is projected from the joint end face 13 b of the beam portion 13. The protruding portion of the connecting joint 11 (protruding end 11a shown in FIG. 11C) is inserted and fixed in the beam main reinforcing hole 13a of the beam portion 13 of another PC beam 10 adjacently joined. .

  The PC beam 10 'shown in FIG. 4 has a shape different from that of the PC beam 10 shown in FIG. That is, the PC beam 10 ′ is configured to include the beam portions 13 (the first beam portion 13 </ b> A, the second beam portion 13 </ b> B, and the third beam portion 13 </ b> C) in three directions from the column portion 12. Here, the third beam portion 13C extends in a direction orthogonal to the material axis direction of the other first beam portion 13A and the second beam portion 13B, and the first beam portion 13A and the second beam are formed on the joint end surface 13b. Similar to the beam portion 13B, a plurality of beam main reinforcement holes 13a are provided. It should be noted that the length dimension in the extending direction of the third beam portion 13C of the present embodiment is shorter than the length dimension of the first beam portion 13A and the second beam portion 13B.

  As shown in FIG. 5, the PC column 20 includes a column main reinforcement 22, and a plurality of column main reinforcement holes 21 connected to the column portion 12 of the PC beam 10 shown in FIG. 2 are formed on the upper joint end surface 20 a and the lower joint end surface 20 b. Have. These column main reinforcement holes 21 use a sheath tube, and the protruding ends 31a and 31b of the column main reinforcement 31 of the reinforcing bar unit 30 shown in FIG. 1 inserted into the through holes 12a of the column portion 12 are inserted and fixed. It is like that. That is, the lower end (protruding end 31a) of the column main bar 31 inserted through the PC beam 10 bonded to the upper side is inserted into the column main bar hole 21 provided on the upper connection end surface 20a of the PC column 20, and the lower connection of the PC column 20 is performed. The column main reinforcement hole 21 provided in the end surface 20b is inserted with the upper end (protruding end 31b) of the column main reinforcement 31 through which the PC beam 10 joined to the lower side is inserted.

The reinforcing bar unit 30 shown in FIG. 1 has a configuration in which a plurality of column main bars 31, 31,... That can be inserted into the column main bar holes 21 of the PC beam 10 are integrally provided, and a predetermined position of the column part 12 of the PC beam 10. Is provided with a support ring 32 (support member) which is detachably supported. Specifically, the support ring 32 (32A, 32B) is a quadrangular ring member arranged so as to surround the plurality of column main bars 31, 31,... The connection means is detachably connected. And the support structure of the support ring 32 and the column part 12 may be a method in which the support ring 32 fixed to the reinforcing bar unit 30 is simply placed on the upper end surface 12b of the column part 12, or the support ring 32 is bolted It is also possible to use a fixing member such as a method of supporting the column portion 12.
Further, the support rings 32A and 32B also have a function of holding the plurality of column main bars 31 and 31 so as to be arranged at a predetermined interval, and a plurality of them (in FIG. 1, with an interval in the vertical direction of the reinforcing bar unit 30). 2) are provided.

  As shown in FIG. 6, the main muscle restraining member 4 (support member) may be provided separately from the support ring 32 or in place of the support ring 32. The main bar restraining member 4 is made of an L-shaped steel material and has a frame-like member 41 having substantially the same outer shape as the column part 12 of the PC beam 10 in a plan view, and is placed on the frame-like member 41 to restrict the drop of the column main bar 31. And a plurality of locking jigs 42.

  A circular insertion hole 41 b (see FIG. 7) through which each of the plurality of column main bars 31 of the reinforcing bar unit 30 can be passed is formed in the upper flange 41 a facing the horizontal direction of the frame-like member 41. Note that FIG. 6 shows a state in which the locking jigs 42 are provided at three places among a plurality of (here, the same number 16 through the column main bars 31) insertion holes 41b. That is, actually, the locking jigs 42 that support the columnar bars 31 are provided at the positions of all the insertion holes 41b.

  As shown in FIGS. 7 and 8, the locking jig 42 includes a support frame 43 formed in a substantially pentagon shape by five plates, and a screw that is screwed into one first plate 43 a of the support frames 43. Member 44. The second plate 43b and the third plate 43c, which form corner portions facing the inner surface of the first plate 43a of the support frame 43, are portions that inscribe the column main bars 31 at their inner corner portions 43d. The screw member 44 is tightened while the column main bar 31 is brought into contact with the inner corner portion 43d, and the peripheral surface of the column main bar 31 is brought into contact with and locked at the tip 44a of the screw member 44, so that the column main bar 31 does not fall. (See FIG. 9A). Then, by loosening the screw member 44, the locking state of the tip 44a with respect to the column main bar 31 is released, and the column main bar 31 falls (see FIG. 9B).

  As shown in FIG. 9A, a plurality of column main bars 31 are fixed by the main bar restraining member 4 at positions where they do not protrude from the lower end surface 12c of the column part 12 of the PC beam 10, and the column part 12 in that state is fixed to the PC column 20. Placed on the upper joint end face 20a. Next, as shown in FIG. 9B, when the screw members 44 of all the locking jigs 42 are loosened, the fixed state of the column main bars 31 with respect to the main bar restraining member 4 is released and falls, and the lower end (discharge end) 31a) is inserted into the column main muscle hole 21 provided on the upper joint end surface 20a of the PC column 20.

  Next, the case where the column beam joint structure 1 having the above-described configuration is constructed will be described with reference to the drawings. Here, in a state where a pair of PC pillars 20 (referred to as reference numeral 20A) are assembled in advance on the lower floor, the PC beams 10 (referred to as reference numerals 10A and 10B) are placed on the PC pillars 20A. A description will be given of a case where the upper PC pillar 20 (referred to as 20B) is further joined on the PC beams 10A and 10B. In the description of the construction here, the description of the supporting means by the main reinforcement member 4 (FIG. 6) described above is omitted.

  First, as shown in FIGS. 10 (a) and 10 (b), a pair of upper and lower support rings 32A and 32B are formed in a through hole 12a formed in a column portion 12 of a PC beam 10A previously placed on the ground near a construction site. The reinforcing bar unit 30 (the plurality of column main bars 31) in which the position of the column main bars 31 is held is inserted from above the column part 12. The lower support ring 32 </ b> A is disposed at a position where a portion of the column main reinforcement 31 located below the support ring 32 </ b> A is equal to the height dimension of the column part 12 (hole length of the through hole 12 a).

  The reinforcing bar unit 30 is removably supported at a predetermined position with respect to the column part 12 by placing the lower support ring 32 </ b> A on the upper end surface 12 b of the column part 12. At this time, the position of the lower end of the columnar reinforcement 31 inserted into the through hole 12a is a position that substantially coincides with the height of the lower end surface 12c of the column part 12. In addition, the part located below the support ring 32A of the column main reinforcement 31 may be a dimension shorter than the height dimension of the column part 12. In short, the lower end (protruding end 31a) of the column main reinforcement 31 is important. What is necessary is just the state which is not protruded below from the lower end surface 12c of the pillar part 12. FIG.

Next, as shown in FIG. 10 (c), the PC beam 10A provided with the reinforcing bar unit 30 prepared in the above process is lifted, and the column portion 12 of the PC beam 10A is assembled in advance (FIG. 10). Bonding is performed on the PC pillar 20A on the left side of FIG. Specifically, the column portion 12 is placed coaxially with respect to the PC column 20A. Thereby, the position of the column main reinforcement hole 21 provided in the upper joint end surface 20a of the PC column 20A and the through hole 12a of the column part 12 coincide.
Even when the PC beam 10A is in a suspended state, the reinforcing bar unit 30 is supported by the column portion 12 by the support ring 32A, and the positions of the plurality of column main bars 31 are fixed. The lower end of the columnar reinforcement 31 does not protrude from the end face 12c.

  Subsequently, as shown in FIG. 11A, in a state where the column portion 12 of the PC beam 10A is placed on the PC column 20A, the upper and lower support rings 32 are removed and the rebar unit 30 is lowered, The lower end (projecting end 31a) of the column main bar 31 is inserted into the column main bar hole 21 of the PC column 20A and fixed. Here, the support ring 32 is removed so as to be extracted from the upper ends of the column main bars 31 inserted into the through holes 12a. In this joined state, the upper ends (protruding ends 31b) of the plurality of column main bars 31 protrude from the upper end surface 12b of the column portion 12 of the PC beam 10A.

Next, as shown in FIG. 11 (b), the upper-level PC column 20B is bonded onto the column portion 12 of the PC beam 10A bonded to the lower-level PC column 20A. At this time, the PC column 20B is installed while being moved so that the column main reinforcement hole 21 provided in the lower joint end face 20b is inserted into the protruding end 31b of the column main reinforcement 31 protruding from the column portion 12. FIG.11 (c) has shown the state with which the PC pillar 20B of the upper floor was joined.
Then, as shown in FIG. 11 (c), the connecting joint 11 is inserted and fixed in the beam main reinforcement hole 13a of the first beam portion 13A on one side (the right side of the drawing) of the PC beam 10A. At this time, the connection joint 11 is in a state in which one end (projection end 11a) projects from the joint end surface 13b. Although not particularly illustrated, the connecting joint 11 can be inserted into the beam main reinforcement hole 13a of the second beam portion 13B on the other side (left side of the drawing) as described above.

  Next, as shown in FIGS. 12A and 12B, the adjacent PC beam 10B is joined to the PC beam 10A assembled by the above-described process. As the PC beam 10B to be joined here, the above-mentioned PC beam 10 'shown in FIG. 4 is adopted. Also in this case, the reinforcing bar unit 30 is provided in advance in the column portion 12 of the PC beam 10B by the same procedure as that shown in FIGS. 10 (a) and 10 (b). That is, even when the reinforcing bar unit 30 is supported on the column part 12 by the support ring 32A so that the lower end of the column main bar 31 does not protrude from the lower end surface 12c of the column part 12, and the PC beam 10B is lifted, it passes through the through hole 12a. Leave it in a state where it does not move downward.

  Then, the PC beam 10B is moved while being hung, and the beam main reinforcement hole 13a of the second beam portion 13B on one side (the left side in FIG. 12 (a), (b)) is formed in the first beam portion of the existing PC beam 10A. The PC beams 10A and 10B are joined to each other by being inserted from the lateral direction into the protruding end 11a of the connecting joint 11 protruding from 13A (see FIG. 12C). At this time, as shown in FIG. 12 (c), it is placed coaxially with respect to the PC column 20A on the right side of the paper surface where the column part 12 is assembled in advance, and on the upper joint end surface 20a of the PC column 20A. The positions of the provided column main muscle holes 21 and the through holes 12a of the column part 12 are made to coincide with each other.

  Next, as shown in FIG. 12C, in a state where the column portion 12 of the PC beam 10B is placed on the PC column 20A, the upper and lower support rings 32 are removed, and the rebar unit 30 is lowered to thereby lower the column. The lower end (protruding end 31a) of the main bar 31 is inserted into the column main bar hole 21 of the PC column 20B and fixed. In this joined state, the upper ends (protruding ends 31b) of the plurality of column main bars 31 protrude from the upper end surface 12b of the column portion 12 of the PC beam 10B.

Next, as shown in FIGS. 13A, 13 </ b> B, and 14, the upper-level PC pillar 20 </ b> B is joined onto the pillar portion 12 of the PC beam 10 </ b> B. At this time, the PC column 20B is installed while being moved so that the column main reinforcement hole 21 provided in the lower joint end face 20b is inserted into the protruding end 31b of the column main reinforcement 31 protruding from the column portion 12.
The operations shown in FIGS. 10 to 14 complete the joining of the adjacent PC beams 10A and 10B and between the PC beams 10A and 10B and the PC pillars 20A and 20B.
Moreover, a frame can be constructed by repeating such operations and joining the column beams.

  In the construction procedure described above, the PC column 20B on the upper floor and the adjacent PC beam 10B are assembled after the PC beam 10A is joined, and the standing time of the column main bars 31 protruding from the column part 12 of the PC beam 10A is set. Although it can be minimized, it is not limited to such a procedure. For example, after joining one PC beam 10A, the other PC beam 10B may be joined, and then the upper-level PC pillar 20B may be joined onto one PC beam 10A. Can be done.

Next, the operation of the column beam joint structure 1 having the above-described configuration will be described in detail.
As shown in FIG. 1, in the column beam connection structure 1 of the present embodiment, the reinforcing bar unit 30 inserted through the through hole 12 a provided in the column portion 12 of the PC beam 10 is connected to the column from the lower end surface 12 c of the column portion 12. It can support with respect to the column part 12 so that the lower end of the main reinforcement 31 may not protrude. Therefore, when joining the PC beam 10 on the PC column 20 installed in advance, even if the reinforcing bar unit 30 is provided for the PC beam 10 to be lifted, the bottom of the column portion 12 of the PC beam 10 is provided. It becomes possible to make the column main reinforcement 31 not project from the end face 12c.

  Then, when the PC beam 10 is placed at a predetermined position on the joint end face of the PC column 20, the support ring 32 is removed to release the support state for the column portion 12 of the reinforcing bar unit 30, so that the column main reinforcement 31 is It protrudes from the lower end surface 12c of the column part 12, and the lower end of the column main reinforcement 31 is inserted and fixed in the column main reinforcement hole 21 of the PC column 20, whereby the PC column 20 and the PC beam 10 are joined.

  As described above, the PC pillar 20 is configured such that the column main reinforcement holes 21 are provided in the upper and lower joining end faces 20a and 20b and there is no protrusion. On the other hand, the PC beam 10 has only to incorporate the reinforcing bar unit 30 into the PC beam 10 only when the PC beam 10 is joined to the PC column 20, and when the reinforcing bar unit 30 is not provided, there is no protruding portion. Therefore, even if the reinforcing bar unit 30 is provided at the time of lifting, at least the lower end surface 12c of the column part 12 has no protruding part. Therefore, it is possible to reduce time and effort required to protect the protruding portions of the PC members such as the PC beam 10 and the PC pillar 20.

  Further, since the reinforcing bar unit 30 is provided with a support ring 32 that is detachably supported at a predetermined position of the column part 12, the reinforcing bar unit 30 is inserted into the through hole 12 a of the column part 12. Can be supported at a predetermined position of the column portion 12 of the PC beam 10. Since the support ring 32 is provided so as to be detachable from the column part 12, each column main bar of the reinforcing bar unit 30 is released by removing the supporting ring 32 from the reinforcing bar unit 30 at an appropriate timing to release the support state. 31 will be in the state which can be penetrated with respect to the through-hole 12a.

  In addition to the function that the support rings 32A and 32B of the present embodiment support the reinforcing bar unit 30 on the column portion 12 of the PC beam 10, the interval between the column main bars 31 and 31 can be maintained. Thus, when releasing the support state with respect to the column part 12 of the reinforcing bar unit 30, by removing the support ring 32, the connection between the plurality of column main bars 31, 31 is released, and the connection state between the column main bars 31 is released. Each pillar main bar 31 can individually pass through the through hole 12a.

  Furthermore, in the present embodiment, since the two support rings 32A and 32B are provided at intervals in the vertical direction of the reinforcing bar unit 30, once removed from the lower support ring 32A step by step, It is possible to prevent the holding state of the plurality of column main bars 31 from being released. That is, it is possible to prevent the restriction that keeps the interval between the upper ends of the column main bars 31 from being lost and the smooth insertion.

  Furthermore, the beam portion 13 is provided with a beam main reinforcement hole 13a into which a separate connection joint 11 can be inserted, and only the beam main reinforcement hole 13a is provided on the joint end surface 13b of the beam portion 13, so that FIG. As shown, when the beam portion 13B of the other PC beam 10B is joined to the beam portion 13A of the first PC beam 10A, the connecting joint is connected to the beam main reinforcing hole 13a of the one beam portion 13A. After the reinforcement 11 is attached, the beam main reinforcement hole 13a of the beam portion 13B of the other PC beam 10B is inserted into the protruding end 11a of the connection joint reinforcement 11 protruding from the joint end face 13b. 10B are joined together. In other words, the PC beam 10 lifted at the time of joining has no protrusion on the joint end surface 13b of the beam 13 in addition to the lower end surface 12c of the column part 12, so that it takes time to protect the protrusion of the PC member. Can be reduced.

As described above, in the precast concrete column beam joining method according to the present embodiment, the projection portion of the PC member composed of the PC beam 10 and the PC column 20 is eliminated or reduced at the time of lifting or transporting, thereby protecting the projection portion. It is possible to reduce the time and effort required for the construction, and to improve the efficiency of construction.

As mentioned above, although embodiment of the joining method of the precast concrete column beam by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.
For example, in the joint structure of the precast concrete column beam according to the present embodiment, the rebar unit 30 is supported by the column portion 12 of the PC beam 10 using the ring-shaped support ring 32 or the main bar restraining member 4 is used. However, the present invention is not limited to this, and other configurations and other support means can be used. For example, in the present embodiment, the support ring 32 includes a support mechanism for the column portion 12 and a function of holding the positions of the column main bars 31, but does not have the holding function. May be. Moreover, although the L-shaped steel material is used in the frame-like member 41 of the main bar restraining member 4 of the present embodiment, it may be a flat plate.

  Further, the configuration of the PC beam, the cross-sectional shape of the PC pillar, the length dimension, the number of main bars, and the like are not limited to the present embodiment, and can be appropriately changed. For example, in the present embodiment, the entire cross section of the beam portion 13 of the PC beam 10 is formed of precast concrete (PC), but only a part of the cross section (for example, a substantially half cross section) is formed of PC. be able to.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

1 Beam-column joint structure 4 Main bar restraint member (support member)
10, 10 ', 10A, 10B PC beam (precast concrete beam)
DESCRIPTION OF SYMBOLS 11 Connection joint 11a Protruding end 12 Column part 12a Through-hole 12b Upper end surface 12c Lower end surface 13, 13A, 13B, 13C Beam part 13a Beam main reinforcement hole 13b Joint end surface of a beam part 14 Beam main reinforcement 20, 20A, 20B PC column (precast Concrete pillars)
20a Upper joint end face 20b Lower joint end face 21 Column main reinforcement hole 22 Column main reinforcement 30 Reinforcement unit 31 Column main reinforcement 31a, 31b Projection end 32 Support ring (support member)
41 Frame-like member 42 Locking jig

Claims (1)

A precast concrete (PC) beam comprising a pillar part and a beam part projecting from the pillar part, and having a plurality of through holes penetrating the pillar part in a vertical direction;
A precast concrete (PC) column having column main reinforcement holes to be bonded to the column portion of the PC beam on the upper and lower bonding end surfaces;
A columnar main bar that can be inserted into the through hole;
A precast concrete column beam joining method comprising:
Using a reinforcing bar unit in which a plurality of column main bars are integrally fixed, the column main bars are inserted into the through holes so that the lower ends of the column main bars do not protrude from the lower end surface of the column part. Fixing the reinforcing bar unit to the part;
When the column portion of the PC beam is placed on the PC column, releasing the fixed state of the column main bar of the reinforcing bar unit;
Inserting and fixing the protruding end of the column main bar of the reinforcing bar unit penetrated through the through hole into the column main bar hole of the PC column; and
Inserting a separate connecting joint into a beam main reinforcement hole provided in a joint end face of the beam portion of the PC beam placed on the PC column;
A step of inserting a beam main reinforcement hole provided in a joint end face of a beam portion of another PC column into a projecting end projecting from the joint end face in the separate connecting joint;
A method for joining precast concrete column beams characterized by comprising:

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