JP2018123644A - Junction structure of precast concrete member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a junction structure of a precast concrete member having a junction that is unnecessary for joint arrangement at a framework and a site in construction work at the site.SOLUTION: A junction structure of a precast concrete member has: a precast concrete wall body 50 in which reinforcing bars 10 and 20 are vertically arranged and a recess 60 is formed on a side end face in a width direction along a height direction; and a joint hardware 30 in which perforated steel plate dowels 32 are projected and arrayed at predetermined intervals in a height direction of the wall body 50 from the wall body side face of the recess 60. A space of a junction 70 formed so as to face the recess 60 is filled with a grout material. The grout material is solidified so as to include the perforated steel plate dowels 32 in the space, and the wall bodies 50 and 50 are joined to each other.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a joint structure between walls and wall columns of a precast concrete member in the construction of a building using a precast concrete member, and in particular, a precast that does not require a formwork at a vertical joint in construction work on site. The present invention relates to a joint structure of concrete members.

  In a reinforced concrete structure, various precast concrete members (hereinafter abbreviated as “precast members”) manufactured in advance in a factory are often used in order to rationalize construction and shorten the construction period. At this time, when the seismic wall is constituted by a precast member, for example, the vertical rebar of the horizontal joint is joined by a mechanical joint such as a mortar filling joint, but the horizontal rebar at the vertical joint is It is common to join with a lap joint.

JP-A-7-197566

  In the case of a lap joint, the length required for the lap joint is 30 to 40 d with respect to the reinforcing bar diameter d in design. Therefore, even when the earthquake resistant wall is formed of a precast member, for example, when D10 to D16 are used for the wall bars, it is necessary to secure a cast-in-place concrete portion of about 300 to 640 mm between the precast members to be joined. (See Patent Document 1).

  This cast-in-place concrete part requires formwork, reinforcement work, concrete work, etc. Even if precast members are used, the effects of shortening the construction period and saving labor are often not obtained sufficiently.

  Accordingly, an object of the present invention is to provide a precast member that does not require formwork, reinforcement work, concrete work, or the like of the vertical joint by using a joint metal for the vertical joint, and a joint structure thereof.

  In order to achieve the above object, the present invention provides a precast concrete wall body body in which reinforcing bars are vertically and horizontally arranged and a recess is formed along the height direction on the side end surface in the width direction, and the inside of the recess. A precast concrete member joining structure comprising a joint metal fitting in which a perforated steel plate gibber protrudes and is arranged at a predetermined interval in the height direction of the wall body main body from the side surface of the wall body, and the recesses face each other. Thus, the space formed by facing and arranging is filled with a grout material, and the grout material is solidified so as to include the perforated steel plates arranged in the space, and the precast concrete members are joined together. It is characterized by that.

  Further, as another invention, a reinforcing bar is vertically and horizontally arranged, a wall body body made of precast concrete in which a concave portion is formed along a height direction on a side end surface in a width direction, and from the side surface of the wall body in the concave portion. A precast concrete wall member comprising a joint metal fitting in which a perforated steel plate gibber protrudes and is arranged at a predetermined interval in the height direction of the wall body main body, a precast concrete column body, and the height from the side of the column body The perforated steel plate gibber protrudes at a predetermined interval in the direction, and is a joint structure with a precast concrete column member provided with joint metal fittings arranged opposite to each other so that the concave portion and the column body side face each other. The precast concrete is filled with a grout material in a space formed in an array and solidified so that the grout material includes the perforated steel plates arranged in the space. Characterized in that between the member and the precast concrete column member is joined.

  The joint portion includes the perforated steel plate gibber protruding into the recess of the precast concrete wall member, and the adjacent precast concrete wall member or the perforated steel plate gibel of the precast concrete column member arranged to face the recess. Are preferably arranged at different arrangement heights so as to protrude into the joint.

  It is preferable that a reinforcing bar is passed through a hole of a perforated steel plate gibber located in the joint.

  According to the present invention, since the joint metal is used for the vertical joint, there is no need for formwork, bar arrangement, concrete work or the like of the vertical joint. Therefore, the construction period can be shortened, labor can be saved, and the cost can be reduced.

(A) is front sectional drawing of the precast wall member which concerns on one Embodiment of this invention, (b) is Ib-Ib plane sectional drawing of (a), (c) is an expansion plane of the recessed part of a precast wall member. Sectional drawing, (d) is an enlarged plan sectional view of a recess of a modified example of a precast wall member. (A) is a perspective view of the precast wall member which concerns on this invention, (b), (c) is a plane of the modified example of the joint metal fitting which has the perforated steel plate diver used for the joining structure of the precast member which concerns on this invention Sectional drawing. (A) is a front view of a joint metal fitting having a perforated steel plate dowel used for the precast member joining structure according to the present invention, (b) is a plan view thereof, and (c) and (d) are perforated steel plates. The front view of the modification of a dowel, (e) is a top view of the modification of a perforated steel plate dowel. (A) is front sectional drawing of the junction structure of precast wall members, (b) is front sectional drawing of the junction structure of a precast wall member and a precast pillar member. The perspective view of the front cross section of the joining structure of the precast wall members which concern on this invention. The plane sectional view shown by the VI-VI section line of Drawing 4 (a). The plane sectional view shown by the VII-VII section line of Drawing 4 (b). (A) is front sectional drawing of the column standing process of the joining structure of the precast member concerning this invention, (b) is the plane sectional view shown by the VIIIb-VIIIb sectional line of (a). (A) is front sectional drawing of the wall standing-up process (1) of the joining structure of the precast member based on this invention, (b) is the plane sectional view shown by the IXb-IXb sectional line of (a). (A) is front sectional drawing of the wall standing-up process (2) of the joining structure of the precast member which concerns on this invention, (b) is the plane sectional view shown by the Xb-Xb sectional line of (a). (A) is front sectional drawing when the vertical junction part of the joining structure of the precast member concerning this invention is joined, (b) is the plane sectional view shown by the XIb-XIb sectional line of (a).

  In the present invention, the precast member joining structure as an embodiment of the present invention refers to a structure located at a position where the precast wall members are joined to each other or the precast wall member and the precast column member are joined. The configuration of each of these members and the joining structure will be described below with reference to FIGS.

[Precast wall member]
Fig.1 (a) is front sectional drawing of the precast wall member 1 in one Embodiment of this invention, The same figure (b) is the plane sectional drawing shown by the Ib-Ib sectional line of Fig.1 (a). As shown in FIG. 1A and FIG. 2A, a precast wall member 1 includes a wall body main body 50 in which a concave portion 60 is formed on the side end surface over the entire height, and a bar arrangement in the horizontal direction within the wall body main body 50. The horizontal bars 10, the vertical bars 20 arranged perpendicular to the horizontal bars 10, and the perforated steel plate gibbles 32 are arranged in the vertical direction at substantially equal intervals with the horizontal bars 10 so as to protrude from the recess 60. The joint hardware 30 is provided.

  In the horizontal bars 10, 10, vertical bars 20, 20,... Serving as vertical and horizontal bars, in this embodiment, the deformed reinforcing bars D13 are used for the horizontal bars 10 and the D16 bars are used for the vertical bars 20. As shown in FIG. 1B, the horizontal stripe 10 is linear. Depending on the thickness of the precast wall member 1, a fixing hook 11 may be provided as shown in FIG. The fixing hook 11 also functions as a reinforcing bar for the concave portion 60. The horizontal stripes 10, 10,... Are arranged at a pitch of 100 to 200 mm in the height direction as shown in FIG. As shown in FIG. 1B, the horizontal bars 10 are arranged along both surfaces in the thickness direction of the precast wall member 1.

  The vertical bars 20, 20,... Are arranged at a pitch of 200 to 300 mm along both surfaces in the thickness direction of the precast wall member 1, as shown in FIGS. As shown in FIG. 1A, the upper end 21 of the vertical bar 20 of the vertical bar 20 protrudes from the upper surface of the wall body 50 of the precast wall member 1 by the upper bar slab thickness and the bar length corresponding to the joint length on the upper floor. . When a beam is provided on the precast wall member 1, the height of the beam is added to this length. The state where the sleeve joint 23 of the well-known mortar filling type joint is attached to the lower end of the vertical bar 20 as an example is shown. The sleeve joint 23 into which the lower end of the vertical bar 20 is inserted is a horizontal joint part into which the upper end 21 of the vertical bar 20 of the other precast wall member 1 of the lower floor or the upper end of the fixing bar of the underground beam is inserted. It is. Grout holes (not shown) are provided at the upper and lower ends of the sleeve joint 23.

  FIGS. 3A and 3B show the overall configuration of the joint hardware 30. As shown in FIG. 1, the joint hardware 30 has a configuration in which a perforated steel plate gibber 32 having a substantially blade-like shape is welded and joined 32 a to the tip of the support reinforcing bar 31. In the present embodiment, a deformed reinforcing bar (D16) is used for the supporting reinforcing bar 31. As shown in FIG. 3C, the reinforcing bar 31 can be shortened by providing a 180 ° hook 34 and a fixing metal 35 at the end of the supporting reinforcing bar 31. Further, as shown in FIGS. 1 (a) and 1 (b), the fitting hardware 30, 30,... Are hooked at the same distance in the height direction with the horizontal bars 10, 10,. The stripes 40 are arranged at a pitch of 100 to 200 mm along the vertical direction so as to be horizontally supported by the horizontal stripes 10. As shown in FIGS. 2 (a) and 3 (a), the perforated steel plate dowel 32 of the joint hardware 30 protrudes from the recess 60 described later so that the steel plate of the perforated steel plate gibel 32 becomes a vertical surface. A circular hole 33 is formed in the steel plate portion. In the present embodiment, the size of the perforated steel plate gibble 32 is set to 90 × 200 mm, the thickness is 9 mm, the diameter of the circular hole 33 is set to 50 mm, and the length of the welded joint 32a is 100 mm.

  Here, the perforated steel plate gibble 32 used for the metal joint 30 will be briefly described below. The dimensions of the perforated steel plate gibel 32 and the circular holes 33 may be other than the dimensions shown in the present embodiment, and the number of the circular holes of the perforated steel plate gibel 32 is plural as shown in FIG. May be. Moreover, it cannot be overemphasized that the shape of the hole of the perforated steel plate dowel 32 is not limited to a circular shape (circular hole) and can be appropriately changed. As shown in FIG.3 (e), it is also preferable to provide a rib in the periphery of a circular hole.

  In addition, the shear strength of a junction part can be improved by inserting a reinforcing bar (not shown) in the circular hole 33 of the perforated steel plate dowel 32. In this case, it is preferable to provide an insertion hole for inserting a reinforcing bar in a part of the concave portion 60 that becomes the joint portion 70 (see FIGS. 4 and 5).

  In the present embodiment, the joint hardware 30 is supported by the hook bars 40. However, as shown in FIGS. 2B and 2C, the joint hardware 30 may be arranged without using the hook bars 40. it can. A joint metal 30a having a supporting reinforcing bar 31a that is cranked in a plane and is directly locked to the horizontal bar 10 or is obliquely arranged with respect to the horizontal bar 10 and the hook at the end is directly locked to the vertical bar 20 A fitting hardware 30b having the supporting reinforcing bar 31b that has been made may be used.

  In this embodiment, as shown in FIGS. 6 and 7, the hook bars 40 are locked to the vertical bars 20 and 20 of the precast wall member 1 or main bars 20A and 20A of the precast column member 2 described later. 10 or 10 or hoop muscles 10A and 10A described later.

  The joint hardware 30 and the recess 60 are provided in the vicinity of the wall core of the precast wall member 1 or in the vicinity of the center line of the column of the precast column member 2 to be described later. May deviate from.

  As shown in FIG. 6, the wall body main body 50 constituting the precast wall member 1 is assembled in the precast concrete member manufacturing factory while securing the necessary cover thickness. , And hook bars 40, 40,... Is a standard product manufactured by placing concrete in a formwork in which a rebar assembly is arranged. In this embodiment, the standard is 3500 × 2200 × 180 mm. It consists of a plate. On the left and right side end surfaces of the wall body 50, substantially trapezoidal concave portions 60, 60 (see FIGS. 1B and 1C) are provided. Further, as shown in each of FIG. 4 and FIGS. 5 to 7 and the like, the recess 60 is opposed to the recess 60 of the precast wall member 1 connected so as to be adjacent to each other, and has a substantially trapezoidal shape in plan view. A joining portion 70A (to be described later) having a substantially trapezoidal shape in plan view is formed opposite to a joining portion 70 having a flat hexagonal shape or a column body 50A of the precast column member 2 to be described later. Each recessed part 60 is substantially trapezoidal in this embodiment, and the dimension of each part is a = 50 mm, b = 80 mm, and c = 90 mm (refer FIG.1 (c)). When the rectangular concave portion shown in FIG. 1D is used, it is preferable that a = 50 and c = 90. In addition, these dimensions of the recessed part 60 are examples, and may be other than these dimensions, and the shape may be other than a trapezoid or a rectangle, for example, a semicircular shape or an oval shape.

[Precast column member]
As shown in FIG. 7, the precast column member 2 according to the embodiment of the present invention has a columnar body 50 </ b> A constituting the precast column member 2, and a predetermined number is arranged circumferentially along the cross-sectional shape of the column body 50 </ b> A. The column main reinforcement 20A, the hoop reinforcement 10A that is arranged so as to secure a predetermined cover so as to surround the column main reinforcement 20A, and the hoop reinforcement so that each perforated steel plate gibble 32 protrudes from the side of the column. 10A and a joint hardware 30 disposed in the vertical direction at substantially equal intervals.

  Hereinafter, the precast column member 2 will be described. In the present embodiment, unlike the precast wall member 1, the recess 60 is not formed in the precast column member 2.

  In this embodiment, the deformed reinforcing bar of D29 is arranged as a main reinforcing bar 20A along the outer shape of the precast column member 2 with a predetermined covering at a pitch of 125 mm. As shown in FIG. 4B, the main bar upper end 21A of the main bar 20A protrudes from the upper end of the precast column member 2, and the lower end of the main bar 20A passes through a sleeve joint 23A, which is a well-known mortar-filled joint. (Not shown). Further, as the hoop reinforcement 10A, deformed reinforcing bars D16 are arranged at a pitch of 100 mm in the height direction so as to surround the main reinforcements 20A, 20A,. The joint hardware 30 protrudes from the side surface of the column body 50A so that the steel plate of the perforated steel plate dowel 32 is vertical.

  As with the wall body 50, the column body 50A (see FIG. 7) is also a standard product manufactured at a precast concrete member manufacturing factory. In this embodiment, the column cross section is set to 800 × 800 mm and the column height is 2200 mm. Has been. Then, the perforated steel plate gibbels 32, 32 of the joint hardware 30, 30 are spaced apart from each other by a predetermined distance across the entire column height at the column width central position on the side surface of the column body main body 50A that serves as the joint surface with the wall body main body 50. It is formed to protrude.

  In addition, the diameter of each reinforcement mentioned above, bar arrangement pitch, each part dimension of a concrete member (precast wall member 1, precast column member 2), etc. are not restricted to the numerical value shown in this embodiment, The target building It is preferable to set appropriately according to the scale, strength, etc. required for the above.

[Composition of joint part]
4 to 7 show the configuration of the joint portions 70 and 70A. FIG. 4A shows a plan sectional view of the joint 70 formed by the concave portions 60, 60 of the precast wall members 1, 1 arranged in a straight line so as to construct a straight wall facing each other. ing. As shown in an enlarged view in FIG. 6, since the concave portions 60, 60 are opposed to and in contact with each other, the joint portion 70 plays a role of a mold for defining a space in which the concave portions 60, 60 are filled with mortar. For this reason, a formwork becomes unnecessary at the time of mortar filling of a vertical junction. As shown in FIG. 5, the perforated steel plate dowels 32, 32 of the precast wall members 1, 1 are different in the joint 70 so as to include the respective perforated steel plate gibels 32 so as to have different arrangement heights. By being arranged on a plane, they can protrude into the joints 70 alternately without interfering with each other. As a result, when the precast wall member 1 is built, the perforated steel plate gibble 32 of the precast wall member 1 already built in does not interfere with the perforated steel plate gibble 32 of the precast wall member 1 being built, and the workability is improved. improves. In addition, since the spacing between the perforated steel plate dowels 32 can be sufficiently secured by such an arrangement, the grout material is sufficiently filled around the circular holes 33 of the perforated steel plate dowels 32, and the adhesion strength of the joint portion 70 is increased. Can be increased.

  FIG. 4B shows a plan cross-sectional view of a joint portion 70 </ b> A formed by the concave portion 60 of the precast wall member 1 and the concrete column body 50 </ b> A facing the precast column member 2. In the joining portion 70A, the perforated steel plate dowel 32 of the precast wall member 1 and the perforated steel plate dowel 32 of the precast column member 2 include the perforated steel plate dowels 32 so as to have different arrangement heights. By being arranged on different planes, they protrude alternately into the joint portion 70A without interfering with each other. As shown in the cross-sectional plan view of FIG. 7, the joint portion 70 </ b> A has the concave portion 60 and the concrete column body 50 </ b> A facing the precast column member 2 facing each other, so the concave portion 60 and the concrete column body 50 </ b> A are grouted. Since it plays the role of a formwork that divides the space in which the material is filled with mortar, no formwork is required when filling the mortar of the vertical joint.

  In order to ensure that the joints 70 and 70A function as a joint structure, a high strength, non-shrinkage, and high fluidity non-shrink high strength mortar is filled as a grout material so as to completely fill the space.

[Precast member joining structure]
Next, the construction procedure of the joint structure of the precast wall member 1 and the precast column member 2 will be described with reference to FIGS.

  As shown in FIG. 8 (a), on any floor, upper floor upper ends 21, 21,... And main bars upper ends 21A, 21A,. The precast column members 2 and 2 are built with a crane or the like so that the main bar upper ends 21A, 21A,... Are inserted into the sleeve joints 23A, 23A,. At this time, as shown in FIG. 8 (b), the precast column member 2 fitting hardware 30, 30,... Are arranged at positions where the concave portions 60 of the precast wall member 1 are arranged in plan view. It is important to install the column member 2. At this time, the non-shrinking high-strength mortar is filled in the sleeve joints 23A, 23A,... And the precast column member 2 is fixed to the floor slab S.

  Next, as shown in FIG. 9A, the vertical cast upper ends 21, 21,... Are inserted into the sleeve joints 23, 23, etc. of the precast wall member 1 adjacent to the precast column member 2, and the precast wall member 1 is inserted. Build in. At this time, as shown in FIG. 9B, the precast wall member 1 is installed so that the joint hardware 30, 30,... Of the precast column member 2 are arranged in the recess 60 of the precast wall member 1 in a plan view. This is very important. Thereafter, the non-shrinking high-strength mortar is filled into the concave portion 60 of the precast wall member 1 facing the sleeve joints 23, 23,..., The precast column member 2 to complete the joint 70A, and adjacent to the precast column member 2. The precast wall member 1 is joined to complete the joined structure.

  As shown in FIGS. 10A and 10B, the precast wall member 1-between the precast wall member 1-1 that has already been joined to the precast column member 2-1 and the other precast column member 2-2. The two sleeve joints 23, 23 are inserted into the upper ends of the vertical bars 21, 21, ..., and the precast wall member 1-2 is installed. Then, the non-shrinking high-strength mortar is filled in the sleeve joints 23, 23, ..., the precast wall member 1-2 is fixed to the floor slab S, and the non-shrinking high-strength mortar is added to the precast wall member 1-2 and this. The concave portions 60 and 60 constituted by the opposing self-casting precast wall member 1-1 are filled to form the joint portion 70. Thereby, the precast column member 2-1, the precast wall member 1-1, the precast wall member 1-2, and the precast column member 2-2 are integrally joined, and the joining structure shown in FIGS. 11 (a) and 11 (b). Is completed.

  Thereafter, the precast wall members 1, 1, precast column members 2, 2,... Are joined to members such as beams and floors (not shown) to complete the entire frame structure, and then the floor, partition walls and the like are installed.

  According to the present embodiment, the joint portion 70 of the precast wall members 1 and 1 is formed as a small closed space by the recess portions 60 and 60, and the joint portion 70A of the precast wall member 1 and the precast column member 2 is the recess portion 60 and the concrete column body. A small closed space is formed by the main body 50A. This eliminates the need for a formwork when filling the mortar of the vertical joint, thus eliminating the need for concrete work and bar arrangement work. Therefore, the construction period can be shortened, labor can be saved, and the cost can be reduced.

  In addition, this invention is not limited to embodiment mentioned above and an experiment example, The various change within the range shown to each claim is possible. In other words, embodiments obtained by combining technical means appropriately changed within the scope of the claims are also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Precast wall member 2 Precast column member 10 Transverse bar 10A Hoop bar 20 Vertical bar 20A Main bar 23, 23A Sleeve joint 30 Metal fitting 32 Perforated steel plate gibel 33 Hole 40 Hook bar 50 Concrete wall body 50A Concrete column body 60 Recess 70 70A joint

Claims (4)

Reinforcing bars are arranged vertically and horizontally, and a wall body body made of precast concrete in which a concave portion is formed along the height direction on the side end surface in the width direction, and the height direction of the wall body main body from the side surface of the wall body in the concave portion A perforated steel plate gibber projecting at a predetermined interval to a joint structure of precast concrete members provided with joint fittings arranged,
The precast concrete is solidified so that a grout material is filled in a space formed so as to be opposed and arranged so that the concave portions face each other, and the grout material includes the perforated steel plates arranged in the space. A joining structure of precast concrete members characterized in that the members are joined together. A wall body body made of precast concrete in which reinforcing bars are arranged vertically and horizontally, and a recess is formed along the height direction on the side end surface in the width direction, and the height of the wall body body from the side surface of the wall body in the recess A precast concrete wall member provided with joint metal fittings in which perforated steel plate gibbles project at predetermined intervals in the direction;
A precast concrete column main body and a precast concrete column member provided with joint metal fittings with a perforated steel plate gibber protruding and arranged in the height direction from the side surface of the column body,
A space formed by facing and installing the concave portion and the column body side face each other is filled with a grout material, and the grout material includes the perforated steel sheet arranged in the space. A joint structure of precast concrete members, wherein the precast concrete wall member and the precast concrete column member are joined by solidification.   The joint portion includes the perforated steel plate gibber protruding into the recess of the precast concrete wall member, and the adjacent precast concrete wall member or the perforated steel plate gibel of the precast concrete column member arranged to face the recess. The joint structure of the precast concrete member according to claim 1 or 2, wherein the two are arranged at different arrangement heights and protruded into the joint portion.   The joint structure of the precast concrete member of any one of Claim 1 thru | or 3 which penetrated the reinforcement bar | burr to the hole of the perforated steel plate dowel located in the said junction part.

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