Precast beam-column member and method for bonding beam member

Abstract

To provide a precast beam-column bonding member that is easily carried in to a construction site and allows the precast beam-column bonding member and a precast beam member to be efficiently bonded.SOLUTION: A precast beam-column bonding member 10A includes a beam member 2 and a beam-column bonding member 1 bonded to the beam member 2 integrally and installed on an erected column 4, of which at least one side face orthogonal to the beam member 2 is bondable to another precast beam member 5. In the beam-column bonding member 1 internally having a column main reinforcement through-hole 11 through which a column main reinforcement 6 of the column 4 is passable and a beam main reinforcement through-hole 12 into which an end of the beam main reinforcement 7 of another precast beam member 5 is insertable, a grout filling joint 20 communicating with the beam main reinforcement through-hole 12, to which a beam main reinforcement 7 end is fixable, is embedded.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a precast column-beam member and a method for joining beam members, and more particularly to a precast reinforced concrete column-beam joining member, a beam member, and a method for joining precast column-beam members and beam members for efficiently joining beam members. [Background technology]

[0002] Conventionally, when factory-fabricated precast beam-column joint members, column members, and beam members are transported to a construction site and the beam members are joined to construct a beam frame, a transport vehicle or a lifting machine is deployed depending on the application. For example, construction efficiency improves when the planar shape has a large number of beams joined at the column-beam joints, within the lifting capacity of the lifting machine. Therefore, various precast members have been proposed that enable efficient construction of beam frames by transporting precast reinforced concrete (hereinafter simply referred to as "precast") beam joint members and precast beam members of various shapes to the construction site (Patent Document 1, Patent Document 2).

[0003] Patent Document 1 discloses a column-beam connection member in Figure 3. This column-beam connection member has a roughly cross shape in plan view, with protrusions that form part of the beam member formed on all four sides of the column-beam connection member. Multiple main beam reinforcement bars of sufficient length protrude from the ends of each protrusion.

[0004] Patent Document 2 discloses a precast beam member that is installed between upright precast columns. Both ends of this precast beam member are provided with split beam-column joints that join together on the column members to form a beam-column joint. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2-101237 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-229855 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the beam-column joint member disclosed in Patent Document 1 is loaded onto a truck or the like and transported, its complex shape can cause problems in transportation and storage. Also, because there are restrictions on the dimensions of members that can be loaded onto a truck, the number of reinforcing bar joints increases in order to achieve a loadable size, which may result in an inefficient shape for construction on site.

[0007] Similarly, the precast beam member disclosed in Patent Document 2 has a complex shape at the beam end where the split column-beam joint is located, making it difficult to manufacture, and its large beam span creates problems during transportation. Furthermore, when constructing a beam frame, there are construction and structural problems in that it is not possible to join the erected precast beam member and the precast beam member in the perpendicular direction at the column-beam joint.

[0008] Therefore, the object of the present invention is to provide a method for joining precast column-beam members and beam members that solves the problems of the conventional technology described above and enables the construction of a beam frame by efficiently joining precast column-beam joining members, beam members, and beam members without hindering the transportation of the precast members. [Means for solving the problem]

[0009] The precast column-beam component of the present invention is a precast column-beam component comprising a beam component and a column-beam connection component that is integrally joined to the beam component, installed on an upright column, and capable of joining another precast beam component to at least one side perpendicular to the beam component, wherein the column-beam connection component has formed therein a column main reinforcement through hole through which the column main reinforcement of the column can be passed, and a beam main reinforcement through hole into which the end of the beam main reinforcement of the other precast beam component can be inserted, and wherein a grout-filled joint that communicates with the beam main reinforcement through hole and can fix the end of the beam main reinforcement is embedded.

[0010] It is preferable that two of the beam members are joined to two opposing side surfaces of the column-beam joint member in a straight line with the column-beam joint member in between.

[0011] It is preferable that the other precast beam members are temporarily joined to the side surfaces of the column-beam joint members on the ground, and then transported to the construction floor while maintaining the temporarily joined state.

[0012] It is preferable that, when the column is installed on the column at the construction floor, the column main reinforcement through holes, the beam main reinforcement through holes, and the grout-filled joints are filled with filler.

[0013] It is preferable that the beam length of the beam member and the other precast beam members is shorter than 1 / 2 of the beam span between the erected columns.

[0014] The beam joining method for the above-mentioned precast column-beam members on the ground is characterized in that a precast beam member is temporarily joined to one side of the column-beam joining member, the precast column-beam member is lifted up to the construction floor while maintaining the temporary joining state, and is installed on a column erected on the construction floor, the column main reinforcement through holes, the beam main reinforcement through holes and the grout-filled joints are filled with filler to stabilize the precast column-beam member, and a new precast beam member is joined to the side of the column-beam joint, and this process is repeated to construct a beam frame on the construction floor. [Effects of the Invention]

[0015] According to the present invention, precast members can be transported without any problems, and a beam frame can be quickly constructed by efficiently joining precast column-beam connection members and precast beam members on site. [Brief explanation of the drawings]

[0016] [Figure 1] 1A and 1B are perspective views showing two types of overall shapes of the precast beam-column member of the present invention. [Figure 2] FIG. 1 is a plan view showing the planar shape of the precast column-beam member shown in each figure. [Figure 3]1(a) is a plan view, elevation view, and side view showing the external shape and internal structure (shown by dashed lines) of the column-beam joint member of the precast column-beam member shown in FIG. [Figure 4] The plan and elevation views showing the procedure for joining a single precast beam member to the column-beam joint member of the precast column-beam member shown in Figure 1(a) during ground assembly, and the external shape after temporary joining. [Figure 5] A plan view and elevation view showing the procedure for joining other precast beam members to the column-beam joint member of the precast column-beam member shown in Figure 4(b) on the construction floor, and the external appearance after joining. [Figure 6] This is an explanatory diagram (part 1) showing the work status ((c)) from the installation status ((a)) of the precast column-beam member to the column member at the construction floor shown in Figure 5 (a) and (b) within the column-beam joint, along with each work procedure. [Figure 7] This is an explanatory diagram (part 2) showing the state after joining of the precast beam members at the construction floor of the precast column and beam members shown in Figure 6 ((d)), and the work state up to the filling work of the column main reinforcement, beam main reinforcement penetration holes, and joints of the member joint surfaces at the column and beam joint ((e)), along with each work procedure. [Figure 8] A plan view showing the procedure for joining two precast beam members to the column-beam joint member of the precast column-beam member shown in Figure 1(a) during ground assembly, and the planar shape of the L-shaped module after temporary joining. [Figure 9] This is a plan view showing the procedure for joining one precast beam member to the column-beam joint member of the precast column-beam member shown in Figure 1(b) during ground assembly, and the planar shape of the T-shaped module after temporary joining. [Figure 10] A plan view showing the procedure for joining two precast beam members to the column-beam joint member of the precast column-beam member shown in Figure 1(b) during ground assembly, and the planar shape of the cross-shaped module after temporary joining. [Figure 11] Figure 1: A work procedure diagram showing an example of the steps for constructing a building frame (plan) by sequentially joining precast beam members using the precast column and beam members shown in each figure. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, the configuration of the precast column-beam member of the present invention and a series of joining steps of the beam member joining method will be described with reference to the attached drawings.

[0018] Figures 1(a) and 1(b) show precast beam-column members 10A and 10B constituting the present invention. Both precast beam-column members 10A and 10B are precast factory-fabricated members that are manufactured to dimensions that allow for easy transportation and delivered to the construction site. The precast beam-column member 10 shown in Figure 1(a) is a composite member in which the end of one beam member 2 is integrally joined to one surface of a beam-column connection member 1. The precast beam-column member 10 shown in Figure 1(b) is a composite member in which the ends of two beam members 2 are integrally joined in a straight line to the opposing surfaces of the beam-column connection member 1. The beam length of the beam member 2 is set slightly shorter than half the beam span between columns in the beam frame of the building. Note that in this specification, the column-beam connection member and the column-beam joint refer to the same location, but when treated as a precast member as shown in Figure 1, it is referred to as a column-beam connection member 1, and when constructed on a column member and functions as part of a structure, it is referred to as a column-beam joint 1. In addition, the term "column-beam member" in the precast column-beam member 10 is used to refer to a precast composite member in which a column-beam connection member 1 and a beam member 2 are integrally manufactured, as shown in Figures 1(a) and (b).

[0019] The drawings in Figure 2 show the planar shapes of the precast column and beam members 10A, 10B shown in the drawings in Figure 1. The precast column and beam members 10A, 10B shown in the drawings in Figure 1 can be selected appropriately in consideration of the joint relationship with other precast beam members 5 (Figures 4, 5, etc.) that are joined perpendicularly to the beam member 2 of the precast column and beam member 10 in the planar layout of the beam frame of a building or the like.

[0020] Each figure in Figure 3 shows the external shape and internal structure (shown by dashed lines) of the beam-column connection member 1 shown in Figure 1(a). The internal structure of the beam-column connection member 1 in Figure 1(b) is almost the same, except that the main beam reinforcement of the two beam members is arranged so that it penetrates the member.

[0021] The external shape and internal configuration of the column-beam connection member 1 will be described below with reference to Fig. 3. As shown in Fig. 1(a) and Fig. 2(a), the column-beam connection member 1 of this embodiment is a precast member that constitutes part of a precast column-beam member 10 and has a cross-sectional shape with approximately the same dimensions as the planar cross section of the column member 4 below. The member height is set equal to the beam depth of the integrally manufactured beam member 2.

[0022] As shown in Figures 1(a) and 3(a)-(c), the beam-column joint member 1 has 12 column main reinforcing bar through holes 11 that penetrate vertically through the member 1, evenly spaced along the periphery with a predetermined cover from the outer periphery. These column main reinforcing bar through holes 11 are formed by embedding and installing a tubular body (not shown) serving as a formwork for forming the through holes at a predetermined position within the member. Ring-shaped or spiral-shaped uneven ribs are preferably provided on the inner and outer periphery of the tubular body at predetermined intervals along the longitudinal direction of the tubular body. These tubular bodies may be removed after pouring the concrete for the beam-column joint member, or they may be left in the concrete to function as retaining members for the wall of the column main reinforcing bar through holes 11 and the beam main reinforcing bar through holes 12. Providing uneven portions or roughening the wall of the through holes allows for integration with the filler material, such as grout, that fills the through holes after the column main reinforcing bars 6 and beam main reinforcing bars 7 are inserted. In addition, prefabricated sheathed pipes or box-punched pipes with ribs can be used as the pipes to be placed in the concrete (Fig. 3(a) and (b)).

[0023] In addition, among the side surfaces of the column-beam joint member 1, three beam main reinforcement through holes 12 are formed in two rows, upper and lower, at equal intervals in the horizontal direction, penetrating between the side surfaces 1a perpendicular to the side surface to which the beam member 2 is integrally joined.

[0024] As shown in Figures 6(c) and 7(d) as examples, the beam main reinforcing bar through holes 12 fix the ends of the beam main reinforcing bars 7 of the precast beam member 5 within the beam-to-column joint member 1, and also serve to guide and hold the beam main reinforcing bars 7 to the joint that joins them. A sleeve S of a grout-filled joint 20 is used as one means of joining the beam main reinforcing bars 7, and is embedded within the beam-to-column joint 1. The beam main reinforcing bar through holes 12 are connected to both ends of the sleeve S of the grout-filled joint 20 so that they communicate with each other, and the ends of the beam main reinforcing bars 7 that pass through the beam main reinforcing bar through holes 12 extend into the sleeve S.

[0025] Furthermore, a cotter 1b is formed at the center of each side surface, which serves as the joint surface with the precast beam member 5 (Figs. 1(a), 3(c), and 7(d)). The cotter 1b has a rectangular shape with a shallow depression in the concrete surface, and as will be described later, functions as a shear resisting element 9 (Fig. 7(e)) when grout material G is completely filled in the joint space C formed opposite a cotter 5b of the same shape (Fig. 7(d)) ​​formed on the beam end surface of the precast beam member 5 joined to the column-beam joint 1.

[0026] [Connecting beam members using L-shaped modules - Building beam frames] Here, we will explain with reference to Figures 4 to 7 how to construct a T-shaped beam frame using an L-shaped module produced by temporarily joining one precast beam member 5 to the side of the column-beam connection member 1 of the precast column-beam member 10 shown in Figure 1(a) that has been delivered to the construction site. This joining work consists of two steps: temporary joining of the precast beam member 5 by assembly on the ground in a temporary assembly space for precast members on the ground, and construction of the beam frame by joining the precast beam member 5 on the construction floor.

[0027] As shown in Figure 4(a), the temporary joining work is performed by inserting the main beam reinforcement 7 protruding from the beam end of the precast beam member 5 into the main beam reinforcement through hole 12 (Figure 3(a)) formed in the column-beam connection member 1 of the precast column-beam member 10A, and then bringing the end face of the precast beam member 5 into close contact with the side surface 1a of the column-beam connection member 1 (Figure 4(b)). A reinforcing brace B made of shaped steel or the like is attached between the precast beam member 5 and the beam member of the precast column-beam member 10, thereby maintaining the shape of the L-shaped module at the time of temporary joining. In Figures 4(a), (b), 5(a), and (b), (1) shows a plan view and (2) shows an elevation view.

[0028] Next, the procedure for joining other precast beam members to the L-shaped module (Fig. 4(b)), which has been temporarily joined by ground assembly and then transported to the construction floor, will be explained with reference to Fig. 5 and Figs. 6(a)-(c), 7(d)-(e). Note that in Figs. 6 and 7, auxiliary reinforcing bars such as tie bars are not shown to simplify the illustration of the interior of the beam-column joint members.

[0029] The L-shaped module (Fig. 4(b)) temporarily joined on the ground is carried up to the construction floor by a crane and suspended above the column members 4 already erected on the construction floor (Fig. 6(a)). At this time, the column main reinforcement 6 of the column members 4 is inserted into the column main reinforcement through holes 11 of the column-beam connection member 1 of the L-shaped module, protruding a predetermined amount from the top surface of the column-beam connection member 1, and the column-beam joint is constructed by filling the column main reinforcement through holes 11 with grout material G (Fig. 6(b)). Until the grout material G hardens, the precast beam member 5 of the L-shaped module is preferably supported by supports such as multiple pipe supports (not shown) erected on the floor surface.

[0030] A precast beam member 5 is joined to the side surface 1a of the beam-column joint 1 of the L-shaped module constructed on the column member 4 (Figs. 5(a) and 6(c)). At this time, the beam main reinforcement 7 of the precast beam member 5 is inserted into the beam main reinforcement through-holes 12 provided through the beam-column joint 1, and the end face of the precast beam member 5 is brought into close contact with the side surface 1a of the beam-column joint member 1 for temporary joining (Figs. 5(b) and 7(d)). Next, grout material G is filled into the upper and lower beam main reinforcement through-holes 12, the sleeves S of the grout-filled joints 20, and the joint space C formed between the beam-column joint 1 and the precast beam member 5, joining the beam-column joint member 1 and the precast beam member 5, thereby constructing a T-shaped beam frame (Figs. 7(d) and 7(e)).

[0031] [Configuration of temporary joint modules of various shapes] An example of the production of a temporary joint module, which is produced by temporarily joining a precast beam member 5 to a column-beam connection member 1 of precast column-beam members 10A, 10B (FIGS. 1(a) and 1(b)) by ground assembly, will be described with reference to FIGS. 8 to 10. FIGS. 8(a) and 8(b) show a T-shaped (inverted T) module formed by temporarily joining precast beam members 5 to both sides of the column-beam connection member 1 of the precast column-beam member 10 shown in FIG. 1(a). To stabilize the two precast beam members 5, 5 temporarily joined to both sides 1a, 1a of the column-beam connection member 1, a reinforcing brace B is attached between each precast beam member 5 and the beam member.

[0032] 9(a) and (b) show a T-shaped module formed by temporarily joining one precast beam member 5 to one side surface 1a of a column-beam joint member 1 of a precast column-beam member 10B, which has two beam members 2, 2 joined in a straight line to the column-beam joint member 1 of the precast column-beam member 10B. The planar shape is the same as the T-shaped module shown in FIG. 8(b), but the choice of which module to use is determined by taking into account the joining conditions of the precast beam member 5 in the beam frame of the building, etc. In addition, to stabilize the temporarily joined precast beam member 5, a reinforcing brace B is attached between the precast beam member 5 and the beam member 2.

[0033] Figures 10(a) and (b) show a cross-shaped module formed by temporarily joining precast beam members 5 to both side surfaces 1a, 1a of the column-beam connection member 1 of the precast column-beam member 10 shown in Figure 1(b). To stabilize the two precast beam members 5 temporarily joined to the precast column-beam member 10, a reinforcing brace B is attached between each precast beam member 5 and the beam member 2.

[0034] Figure 11 shows the steps (STEPs) for constructing a beam frame, in which beam members and column-beam joint members 1 are installed between columns erected at a predetermined interval, by joining the beam members of the modular beam members in the various shapes described above in a provisionally joined state. Figure 11 shows, in plan view, each step up to the stage before erecting modules of various shapes and precast beam members 5 between four columns erected in n, m, and n+1, m+1 ways and joining each beam member. Note that the combination of modules and precast beam members 5 used is only an example; various combinations are possible depending on the number of members and the joining work procedure. For the purpose of explaining Figure 11, the names of the members are symbolized as follows: basic precast column-beam member 10 (Figure 1(a): member BC, Figure 1(b): member 2BC), precast beam member 5 (Figure 4(a): member B), L-shaped module (Figure 4(b): member LM), and T-shaped module (Figure 9(b): member TM).

[0035] In Figure 11, the target is the four columns erected on the lower floors on the n, m and n+1, m+1 paths (Step 0). When erecting beam members from the n path, member 2BC is suspended and installed on the rear column (n, m+1) (Step 1). Member B is attached to the column-beam joint of member 2BC by moving it horizontally from the side (Step 2). Member LM is suspended and installed on column (n, m) (Step 3). Member B is attached to the column-beam joint of member LM installed on column (n, m) by moving it horizontally (Steps 4 and 5). For the n+1 path columns, member LM is suspended and installed on the rear column (n+1, m+1), followed by member TM being suspended and installed on column (n+1, m) (Steps 6 and 7). In each of the above steps, the other end of member B attached to each column-beam joint faces another member B at the center of the beam span, with a predetermined distance between them. The main beam reinforcement bars protruding from the ends of opposing members B are connected with grout-filled joints (not shown), formwork is installed to surround the gap between the ends, and cast-in-place concrete is poured into the formwork, joining the two members B and completing a one-span beam connecting the columns. At this point, grout material G is filled in the main beam reinforcement bars at the column-beam joint and in the joint spaces at the joint surfaces (Figure 7(e)). Note that member B is supported by pipe supports (not shown) until the cast-in-place concrete and grout material at the center of the beam span reach the required strength.

[0036] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. In other words, embodiments obtained by combining technical means modified appropriately within the scope of the claims are also included in the technical scope of the present invention. [Explanation of symbols]

[0037] 1. Column-beam joint members 2 Beam members 4 Column members, columns 5 Precast beam members 6 Column reinforcement 7 Main beam reinforcement 10A, 10B Precast column and beam members 11 Column main reinforcement through hole 12 Beam main reinforcement through hole 20 Grout-filled joints B Reinforcement brace C Joint space G Grout S sleeve

Claims

1. A beam member; A precast column-beam member comprising a column-beam joint member that is integrally joined to the beam member, installed on an erected column, and capable of joining another precast beam member to at least one side perpendicular to the beam member, The column-beam connection member is a precast column-beam member characterized in that it has formed therein column main reinforcement through holes through which the column main reinforcement of the column can pass and beam main reinforcement through holes into which the ends of the beam main reinforcement of the other precast beam member can be inserted, and in which grout-filled joints that communicate with the beam main reinforcement through holes and can fix the ends of the beam main reinforcement are embedded.

2. The precast column-beam member according to claim 1, wherein two of the beam members are joined to two opposing sides of the column-beam joint member in a straight line with the column-beam joint member in between.

3. A precast column-beam member according to claim 1 or claim 2, wherein the other precast beam member is temporarily joined to the side of the column-beam joint member on the ground, and the temporarily joined state is maintained while the precast column-beam member is transported to the construction floor.

4. 3. A precast column-beam component according to claim 1, wherein, when the component is installed on the column at the construction floor, a filler is filled into the column main reinforcement through holes, the beam main reinforcement through holes, and the grout-filled joints.

5. A precast column-beam member according to claim 1 or 2, wherein the beam length of the beam member and the other precast beam members is shorter than half the beam span between the erected columns.

6. A method for connecting precast beam members, comprising the steps of: temporarily joining a precast beam member to one side of the column-beam joint member of the precast column-beam member according to claim 1 or 2 on the ground; lifting the precast column-beam member up to a construction floor while maintaining the temporary joint; installing the precast column-beam member on a column erected on the construction floor; filling the column main reinforcing bar through holes, the beam main reinforcing bar through holes, and the grout-filled joints with filler to stabilize the precast column-beam member; and repeating this process to connect a new precast beam member to the side of the column-beam joint, thereby constructing a beam frame on the construction floor.

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