JP2018178433A - Brace structure and construction method of brace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brace structure which can bear a tensile force and a compressive force and in which construction work is easy, and to provide a construction method of a brace.SOLUTION: A brace structure 20 includes: a pair of connection members 30 provided at a frame 10, and facing each other; a brace 50 connected to the connection members 30, and including a body member 52 formed by wood or concrete and an adjustment member 54 coaxial with the body member 52; through-holes 52H, 54H penetrating into the body member 52 and the adjustment member 54 along a material axis direction; and a tensile wire material (PC steel bar 60) which is inserted in the through-holes 52H, 54H, and whose both end parts are fixed to the connection members 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a brace structure and a method of constructing a brace.

  Patent Document 1 below describes a method of aseismatic reinforcement in which tensile braces are arranged in the diagonal direction of a column and beam frame. In this seismic reinforcement method, connecting strips are respectively wound around columns and beams, and gussets for attaching tension braces are fixed to the connecting strips.

JP-A-54-41529

  When a frame is reinforced using a tension brace as in Patent Document 1 described above, when a horizontal force acts on the frame, the tensile force is borne, but it is difficult to bear the compressive force. Moreover, in order to wind a connection strip around a pillar and a beam, it is necessary to make a hole for penetrating a connection strip through a slab or the like. For this reason, it takes time to construct a brace.

  An object of the present invention is to provide a brace structure and a method of constructing a brace which can bear tensile force and compressive force and which can be easily constructed in consideration of the above-mentioned facts.

  The brace structure according to claim 1 is provided on a frame, and includes a pair of opposing connection members, a main body member connected to the connection member, formed of wood or concrete, and an adjustment member coaxial with the main body member. , A through hole penetrating the main body member and the adjusting member along the material axial direction, and a tensile wire rod inserted through the through hole and having both ends fixed to the connecting member.

  The brace structure according to claim 1 has a brace provided between a pair of connecting members provided in the frame, the body member made of wood or concrete and the adjustment member coaxial with the body member. As a result, when a horizontal force acts on the frame and the distance between the connection members becomes narrow, a compressive force acts on the brace and the brace bears the compressive force.

  Moreover, the both ends of the tension wire rod penetrated by the through-hole of a brace are being fixed to each connection member. Thus, when the horizontal force acts on the frame and the distance between the connecting members is increased, the tensile force acts on the tensile wire rod, and the tensile wire rod bears the tensile force.

  Furthermore, since the brace is divided into the main body member and the adjustment member, the brace can be easily transported and disposed between the connection members as compared with the case where the brace is not divided. For this reason, the construction work of the brace is easy.

  In the brace structure according to claim 2, the adjusting member is disposed at the lower end portion of the main body member.

  In the brace structure according to claim 2, the adjusting member is disposed at the lower end of the main body member. Therefore, after the lower end portion of the tensile wire is pulled up and held into the through hole so as not to protrude from the lower end of the main body member, and the adjustment member is disposed between the main body member and the connection member When released, the tensile wire is inserted into the through hole of the adjustment member by gravity. Thereby, a tension wire can be easily constructed.

  The method for constructing a brace according to claim 3 comprises the steps of: installing a pair of connecting members facing each other on a frame; and pulling wire to a through hole formed along the material axial direction of the main body member shorter than the distance between the connecting members. And the tension wire protruding from one end of the main body member is passed through the hole formed in the one connection member and held so as not to protrude from the other end of the main body member. Disposing the main body member between the pair of connecting members, disposing the adjusting member in the gap between the main body member and the other connecting member to form a brace, and The step of releasing the holding state and inserting the tensile wire into the through hole formed along the material axial direction of the adjusting member, and fixing both ends of the tensile wire to the pair of connecting members, respectively, Pair of connecting members And a, a step of fixing the brace between.

  According to the method of constructing the brace of the third aspect, the brace including the main body member and the adjusting member is constructed between the pair of connecting members provided in the frame. As a result, when a horizontal force acts on the frame and the distance between the connection members becomes narrow, a compressive force acts on the brace and the brace bears the compressive force.

  Moreover, the both ends of the tension wire are being fixed to each connection member. Thus, when the horizontal force acts on the frame and the distance between the connecting members is increased, the tensile force acts on the tensile wire rod, and the tensile wire rod bears the tensile force.

  Furthermore, since the brace is divided into the main body member and the adjustment member, the brace can be easily transported and disposed between the connection members as compared with the case where the brace is not divided.

  Moreover, when arrange | positioning the said main body member between a pair of connection members, it hold | maintains so that a tension wire may not be protruded from the edge part of a main body member. Thereafter, the adjustment member is disposed between the main body member and the connection member to release the holding state of the tension wire. Thereby, the tensile wire is inserted into the through hole. Therefore, a tension wire can be applied easily. For this reason, the construction work of the brace is easy.

  According to the present invention, it is possible to provide a brace structure and a method of constructing a brace which can bear tensile force and compressive force and which is easy to construct.

FIG. 5 is an elevation view showing a brace structure according to an embodiment of the present invention. (A) is the elements on larger scale which showed the connection part of the upper connection member and the main body member of a brace in the brace structure which concerns on embodiment of this invention, (B) is a BB sectional drawing of (A) It is. (A) is the elements on larger scale which showed the connection part of the lower connection member and the adjustment member of a brace in the brace structure which concerns on embodiment of this invention, (B) is a BB sectional drawing of (A) It is. It is an elevation view showing the state where the upper connecting member and the lower connecting member were fixed to the frame in the method for constructing a brace according to the embodiment of the present invention. (A) is an elevation view which shows the state which penetrated PC steel stick to the penetration hole of the upper connection member in the construction method of the braces concerning the embodiment of the present invention, (B) lifts a main body member and is a lower connection member And a gap between the two. (A) is an elevation view which shows the state which has arrange | positioned the adjustment member in the clearance gap between a main-body member and a lower connection member in the construction method of the brace concerning embodiment of this invention, (B) is PC to an adjustment member. It is an elevation view which shows the state which penetrated the steel rod. (A) is an elevation view which shows the modification which has arrange | positioned the adjustment member in the upper end part of the main body member in the brace structure which concerns on embodiment of this invention, (B) divides the main body member, and is a divided main body member It is an elevation view which shows the modification which has arrange | positioned the adjustment member between, (C) is a perspective view which shows the adjustment member in (B).

(Structure)
As shown in FIG. 1, a frame 10 to which the brace structure 20 according to the present embodiment is applied is a reinforced concrete rigid frame, and includes a reinforced concrete column 12 and a beam 14 supported by the column 12.

(Brace structure)
The brace structure 20 is an antiseismic reinforcing structure applied to a structural surface H along the substantially vertical direction formed by the column 12 and the beam 14 in the frame 10, and the inward corner E where the upper beam 14U and the column 12 intersect. The brace 50 and the PC steel rod 60 are bridged to the upper surface S of the central portion of the lower beam 14D from above to form a V-shaped seismic reinforcement structure on the surface H. Although only the centerline CL1 of the structural surface H and the right side portion of the centerline CL1 are shown in FIG. 1, the left side portion of the centerline CL1 is also configured in the same manner.

(Connection member)
The connecting member 30 is a steel member for connecting the brace 50 to the frame 10, and includes a pair of upper connecting members 32 and lower connecting members 42 facing each other.

  The upper connecting member 32 is an L-shaped base plate 34 formed by welding (L joint) two flat plates so as to be orthogonal to each other, and a rib 36 welded to the inside corner (inner side) of the base plate 34 , And a connecting plate 38 welded to the end of the rib 36.

  The base plate 34 is disposed so that the projecting corner (outside) is along the inside corner E where the upper beam 14U and the column 12 are substantially orthogonal to each other, and each side of the L shape is the lower surface of the upper beam 14U and the column 12 It faces the side. Further, the base plate 34 is fixed to the upper beam 14U and the column 12 using a post-installed anchor bolt B.

  The ribs 36 are plate members welded (T-joints) to the sides of the base plate 34 (the side along the lower surface of the upper beam 14U and the side along the side surfaces of the column 12) along the in-plane direction of the structural surface H The portion facing the lower connecting member 42 is obliquely cut. A connecting plate 38 is welded (T-joint) to this cut portion.

  The connecting plate 38 is a substantially square plate disposed along the out-of-plane direction (a direction orthogonal to the in-plane direction) of the structural surface H, and as shown in FIGS. 2A and 2B, the through holes 38H. There are four formed. The PC steel rod 60 as a tensile wire in the present invention is inserted through the through hole 38H. In FIG. 2A, illustration of the post-construction anchor bolt B is omitted.

  Further, between the portion of the rib 36 welded to the base plate 34 and the portion welded to the connection plate 38, reinforcing ribs 39A and 39B are welded along the out-of-plane direction of the surface H, and the rib 36 is formed The deformation in the out-of-plane direction of H is suppressed.

  As shown in FIG. 1, the lower connecting member 42 includes a flat base plate 44, a rib 46 welded to the upper surface of the base plate 44, and a connecting plate 48 welded to the tip of the rib 46.

  The base plate 44 is installed along the upper surface S of the lower beam 14D, and is fixed to the lower beam 14D using a post installation anchor bolt B.

  The rib 46 is a plate member welded (T joint) to the upper surface of the base plate 44 along the in-plane direction of the structural surface H, and the portion facing the upper connecting member 32 is obliquely cut. A connecting plate 48 is welded (T-joint) to this cut portion.

  The connecting plate 48 is a plate member having the same shape (substantially square) as the connecting plate 38 disposed along the out-of-plane direction (direction orthogonal to the in-plane direction) of the structural surface H, as shown in FIGS. As shown in), four through holes 48H are formed. The PC steel rod 60 is inserted through the through hole 48H. In FIG. 3A, illustration of the post-construction anchor bolt B is omitted.

  Further, the reinforcing rib 49A is welded to the rib 46 and the base plate 44 along the out-of-plane direction of the structural surface H (T joint), and the deformation of the rib 46 in the out-of-plane direction of the structural surface H is suppressed. Further, a reinforcing rib 49B is welded to the rib 46 and the connection plate 48 (T joint) to transmit a bearing pressure from a brace 50 described later to the rib 46.

(Brace)
As shown in FIG. 1, the brace 50 is disposed between the upper connecting member 32 and the lower connecting member 42, and includes a main body member 52 and an adjusting member 54 shorter than the main body member 52. The main body member 52 and the adjustment member 54 are wooden members formed using a laminated material in which the fiber direction is arranged along the axial direction. The main body member 52 and the adjustment member 54 are coaxially disposed (arranged sharing the center line CL2), the main body member 52 is disposed on the upper connection member 32 side, and the adjustment member 54 is on the lower connection member 42 side. It is arranged. In other words, the adjustment member 54 is disposed at the lower end of the main body member 52.

  As shown in FIG. 2A, a through hole 52H is formed in the main body member 52 along the axial direction. The through hole 52H is disposed to communicate with the through hole 38H formed in the connecting plate 38 of the upper connecting member 32, and the PC steel rod 60 inserted through the through hole 38H is inserted into the through hole 52H. .

  Similarly, as shown in FIG. 3A, through holes 54H are formed in the adjustment member 54 along the axial direction. The through hole 54H is disposed to communicate with the through hole 48H formed in the connection plate 48 of the lower connection member 42, and the PC steel rod 60 inserted through the through hole 48H is inserted through the through hole 54H. .

  Furthermore, the through hole 52H of the main body member 52 shown in FIG. 2A and the through hole 54H of the adjusting member 54 shown in FIG. 3A are also arranged to communicate with each other. Thereby, as shown in FIG. 1, the PC steel rod 60 passes through the connecting plate 48 of the lower connecting member 42, the adjusting member 54 of the brace 50, the main body member 52, and the connecting plate 38 of the upper connecting member 32 in order from the bottom. ing. The upper and lower ends of the PC steel rod 60 project from the connecting plates 38 and 48, respectively, and nuts N (see FIGS. 2A and 3A) are screwed together and fixed to the connecting plates 38 and 48. Thereby, the brace 50 (the main body member 52 and the adjustment member 54) is fixed to the frame 10 via the connection member 30 (the upper connection member 32 and the lower connection member 42) and the PC steel rod 60.

  In the present embodiment, as shown in FIG. 2A and FIG. 3A, the nut N is a double nut and slack is suppressed, but the embodiment of the present invention is not limited to this. For example, a spring washer may be used as a locking for the single nut, or only a single nut may be used without locking.

(How to build braces)
In order to fix the brace 50 to the frame 10, first, as shown in FIG. 4, a pair of connecting members 30 (upper connecting member 32 and lower connecting member 42) facing each other are installed on the frame 10.

  Specifically, the base plate 34 of the upper connecting member 32 is installed along the inside corner E where the upper beam 14U and the column 12 intersect, and the base plate 34 is further attached to the upper beam 14U and the column 12 Fix using B. In addition, non-shrinkage mortar is suitably filled between the base plate 34, the upper beam 14U, and the pillar 12, and the construction accuracy is adjusted.

  Similarly, the base plate 44 of the lower connecting member 42 is installed on the upper surface of the lower beam 14D, and the base plate 44 is further fixed to the lower beam 14D using a post-installed anchor bolt B. A non-shrink mortar is suitably filled between the base plate 44 and the lower beam 14D to adjust the construction accuracy.

  Further, the PC steel rod 60 is inserted into a through hole 52H formed along the material axial direction of the main body member 52 of the brace 50.

  As shown in FIG. 4, the length L4 of the PC steel rod 60 is longer than the sum of the length L2 of the main body member 52 and the length L3 of the adjusting member 54, and further, the connecting plate 38 of the upper connecting member 32 and the lower It is longer than the distance L1 between the connecting member 42 and the connecting plate 48. Further, the sum of the length L2 and the length L3 is equal to or less than the distance L1, and is approximately 0 to 50 mm shorter than the distance L1.

  Next, as shown in FIG. 5A, the PC steel rod 60 protruding from one end face (upper end face) of the main body member 52 is formed in the through hole 38H formed in the connecting plate 38 of the upper connecting member 32. See FIG. 2 (A)).

  At this time, a worker holds the portion 52U near the upper end and the portion 52D near the lower end of the main body member 52 through which the PC steel rod 60 is inserted, and the PC steel rod 60 holds the other end face of the main body member 52 The operator holds it so that it does not fall from the side end face). In order to prevent the PC steel rod 60 from falling from the lower end surface of the main body member 52, a backing plate or the like may be installed on the lower end surface of the main body member 52.

  Then, the worker holding the portion 52U near the upper end stands in front of the worker holding the portion 52D near the lower end (back side in the drawing of FIG. 5A) and protrudes from the upper end surface of the main body member 52 The tip end of the PC steel rod 60 is directed to the through hole 38H (see FIG. 2A) formed in the connecting plate 38. Then, while inserting the PC steel rod 60 into the through hole 38H, the worker holding the portion 52D near the lower end moves forward, and places the lower end surface of the main body member 52 on the connecting plate 48 of the lower connecting member 42.

  Next, as shown in FIG. 5 (B), while holding the PC steel rod 60 so that the PC steel rod 60 does not fall from the other end face (lower end face) of the main body member 52, Close to the connecting member 32 side. Thus, a gap V1 is formed between the lower end surface of the main body member 52 and the connection plate 48 of the lower connection member 42.

  Next, as shown in FIG. 6A, the adjusting member 54 is disposed in the gap (the gap V1 in FIG. 5B) between the lower end surface of the main body member 52 and the connecting plate 48 of the lower connecting member 42. . Thus, a brace 50 including the main body member 52 and the adjustment member 54 is formed between the upper connection member 32 and the lower connection member 42. The main body member 52 and the adjustment member 54 can be fixed using a scissors.

  Next, as shown in FIG. 6 (B), the holding state of the PC steel bar 60 is released, and the PC steel bar 60 is allowed to freely fall by gravity. Thus, the PC steel rod 60 is inserted into the through hole 54H (see FIG. 3A) of the adjustment member 54.

  Next, nuts N (see FIGS. 2A and 3A) are screwed into the upper and lower ends of the PC steel rod 60 to fix the upper and lower ends of the PC steel rod 60 to the connecting plates 38 and 48. Thereby, the brace 50 (the main body member 52 and the adjustment member 54) is fixed to the frame 10 via the connection member 30 (the upper connection member 32 and the lower connection member 42) and the PC steel rod 60. A spacer made of wood or resin is appropriately disposed between the main body member 52 and the upper connection member 32 and between the adjustment member 54 and the lower connection member 42, and the spacer from the upper connection member 32 or the lower connection member 42 Compressive force is transmitted to the body member 52.

(Action / effect)
As shown in FIG. 1, in the brace structure 20 according to the present embodiment, the main body member 52 and the adjustment member 54 constituting the brace 50 are formed using a laminated material arranged so that the fiber direction is along the axial direction. Wooden members. Thereby, when a horizontal force acts on the frame 10 and the distance between the upper connecting member 32 and the lower connecting member 42 becomes narrow, a compressive force acts on the brace 50, and the main body member 52 bears the compressive force.

  Further, both end portions of the PC steel rod 60 inserted into the through holes 52H and 54H of the brace 50 (the main body member 52 and the adjustment member 54) are fixed to the upper connecting member 32 and the lower connecting member 42. As a result, when a horizontal force acts on the frame 10 and the distance between the connecting members becomes wide, a tensile force acts on the PC steel bar 60, and the PC steel bar 60 bears the tensile force.

  Furthermore, since the brace 50 is divided into the main body member 52 and the adjusting member 54, it is easier to carry as compared with the case where it is not divided, and it is easy to arrange between the upper connecting member 32 and the lower connecting member 42. Moreover, since the main body member 52 and the adjustment member 54 are wooden, they are lightweight as compared with steel materials and the like. For this reason, construction work of the brace 50 is easy.

  Further, in the brace structure 20 according to the present embodiment, the adjustment member 54 is disposed at the lower end portion of the main body member 52. Therefore, as shown in FIG. 5B, the PC steel rod 60 is pulled up from the lower end of the main body member 52 into the through hole 52H (see FIG. 2A) and held, as shown in FIG. 6A. After the adjustment member 54 is disposed between the main body member 52 and the lower connection member 42 and the holding state of the PC steel rod 60 is released, the PC steel rod 60 receives the through hole 54H of the adjustment member 54 by gravity (FIG. A) see through). Thus, the PC steel rod 60 can be easily installed.

  In the present embodiment, the main body member 52 and the adjustment member 54 are made of a laminated material, but the embodiment of the present invention is not limited thereto. For example, either or both of the main body member 52 and the adjustment member 54 may be formed using a wood material such as solid wood, LVL, a material obtained by compression molding of wood chips, or a composite material of powder wood and resin. Alternatively, it may be formed using concrete. Thus, in the brace structure 20 according to the present embodiment, materials can be appropriately selected and used according to the required compressive strength.

  Moreover, although the adjustment member 54 is arrange | positioned at the lower end part of the main body member 52 in this embodiment, embodiment of this invention is not restricted to this. For example, the adjustment member 54 may be disposed at the upper end of the main body member 52. In this case, at the time of installation of the main body member 52, as shown in FIG. 7A, the PC steel rod 60 projects not from the upper end face but from the lower end face of the main body member 52. 48H (see FIG. 3A).

  Then, the adjustment member 54 is disposed in the gap V2 between the upper end surface of the main body member 52 and the connection plate 38 of the upper connection member 32. Thereafter, the PC steel rod 60 is lifted and inserted into the through hole 54H (see FIG. 3A) of the adjusting member 54.

  By arranging the adjustment member 54 at the upper end portion of the main body member 52 in this manner, the adjustment member 54 can be installed in a state where the main body member 52 is placed on the connection plate 48. For this reason, it is not necessary to hold the main body member 52 in a lifted state, and the workability is good.

  Further, as shown in FIG. 7B, the main body member 52 may be divided into the upper member 52A and the lower member 52B, and the adjusting member 54N may be disposed between the upper member 52A and the lower member 52B. . The adjusting member 54N is divided and configured as shown in FIG. 7C so as to cover the PC steel rod 60, and after being arranged between the upper member 52A and the lower member 52B, a long screw is provided. Integrate using 90 mag.

  Moreover, although the PC steel rod 60 is used as a tension wire rod in this embodiment, the embodiment of the present invention is not limited to this. For example, PC steel wire (so-called wire) or carbon fiber wire may be used.

  As described above, the tensile wire may not be inserted into the through hole 52H of the main body member 52 in advance if a material having high flexibility as compared with the PC steel rod is used. That is, after the main body member 52 and the adjusting member 54 are disposed between the upper connecting member 32 and the lower connecting member 42, the connecting plate 48 of the lower connecting member 42, the adjusting member 54 of the brace 50, the main body member 52 and the upper The pull wire can be inserted through the connecting plate 38 of the connecting member 32 at one time. Further, even when the adjustment member is disposed between the upper member 52A and the lower member 52B as described above, the adjustment member can be formed without being divided like the adjustment member 54N.

  Further, in the present embodiment, as shown in FIG. 6B, the PC steel rod 60 is provided with the through hole 52H of the main body member 52 (see FIG. 2A) and the through hole 54H of the adjustment member 54 (FIG. 3A (A). The upper end and the lower end of the PC steel rod 60 are fixed to the connecting plates 38 and 48 after being inserted through both sides), but the embodiment of the present invention is not limited thereto.

  For example, as shown in FIG. 5 (B) or 6 (A), even if the PC steel rod 60 is not inserted into the adjustment member 54, the nut N may be screwed only to the upper end portion of the PC steel rod 60. Good. In this way, when the PC steel rod 60 is allowed to fall freely by gravity after the adjustment member 54 is disposed, the upper end portion of the PC steel rod 60 is the main body member 52 because the nut N is locked to the connection plate 38. It is possible to suppress entry into the through hole 52H of

  Further, in the present embodiment, the braces 50 are disposed in a V-shape on the structural surface H of the frame 10 as shown in FIG. 1, but the embodiment of the present invention is not limited to this. For example, the upper and lower relationship between the upper connecting member 32 and the lower connecting member 42 may be reversed to arrange the brace 50 in an inverted V-shape. Alternatively, the lower connecting member 42 is configured in the same manner as the upper connecting member 32 and arranged at the entry corner of the lower beam 14D and the pillar 12 (the pillar on the left side of the center line CL1; not shown) to form the brace 50 It may be arranged on the diagonal of H.

  In the present embodiment, the frame 10 is a reinforced concrete rigid frame structure, but the embodiment of the present invention is not limited thereto. For example, it may be a steel frame structure. In this case, the upper connecting member 32 and the lower connecting member 42 may be welded to the steel frame column and the steel frame beam. The brace structure 20 can also be applied to a beam or columnless construction type. In this case, the upper connecting member 32 and the lower connecting member 42 may be fixed to a slab or a structural wall.

10 frame 20 brace structure 30 connecting member 32 upper connecting member (connecting member)
38H through hole (hole)
42 Lower connection member (connection member)
48H through hole (hole)
50 brace 52 body member 52H through hole 54 adjustment member 54H through hole 60 PC steel rod (tensile wire)

Claims (3)

A pair of connecting members provided on the frame and facing each other,
A brace coupled to the coupling member and including a main body member formed of wood or concrete and an adjustment member coaxially with the main body member;
A through hole penetrating the main body member and the adjustment member along the material axial direction;
A tensile wire which is inserted through the through hole and whose both ends are fixed to the connecting member;
With brace structure.   The brace structure according to claim 1, wherein the adjustment member is disposed at a lower end of the main body member. Installing in the frame a pair of opposing connecting members;
Inserting a tensile wire into the through hole formed along the material axial direction of the main body member shorter than the distance between the connection members;
The pair of connecting members while passing the tensile wire projecting from one end of the main body member into a hole formed in one of the connection members and holding so as not to protrude from the other end of the main body member Placing the body member between
Disposing an adjusting member in a gap between the main body member and the other connecting member to form a brace;
Releasing the holding state of the tensile wire and inserting the tensile wire into a through hole formed along the axial direction of the adjusting member;
Fixing the braces between the pair of connecting members by fixing both ends of the tensile wire to the pair of connecting members,
How to Build a Brace With.