Beam-bed joint construction

Abstract

This invention provides a beam-floor connection structure that allows reinforced concrete beams and floor slabs to be joined easily and with a simple structure. [Solution] A beam-floor joint structure (1) for joining a reinforced concrete beam and a floor. The beam-floor joint structure (1) comprises a precast concrete beam member (2), a precast concrete floor slab (3) positioned to the side of the beam member (2), and a plurality of axial force members (4) that press-fit the floor slab and the beam member together.

Description

Technical Field

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[0001] The present invention relates to a beam - floor joint structure for joining a reinforced concrete beam and a floor.

Background Art

[0002] Various joint structures for joining a reinforced concrete beam and a floor are known. And various beam - floor joint structures configured to facilitate construction have been proposed. For example, Patent Document 1 describes a beam - floor joint structure including a half - precast beam, a half - precast floor slab supported by the half - precast beam, and top concrete disposed across the upper surface of the half - precast beam and the upper surface of the half - precast floor slab. In the beam - floor joint structure described in Patent Document 1, it is not necessary to place separate top concretes with different design standard strengths on the respective upper surfaces of the half - precast beam and the half - precast floor slab, and the same top concrete can be placed. In the beam - floor joint structure described in Patent Document 1, by placing the same top concrete instead of placing separate top concretes with different design standard strengths on the respective upper surfaces of the half - precast beam and the half - precast floor slab during construction, the construction becomes easier.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the beam - floor joint structure described in Patent Document 1, since the work of placing concrete on the respective upper surfaces of the half - precast beam and the half - precast floor slab is laborious, there is room for improvement. And a beam - floor joint structure with a simple structure and easy construction is required.

[0005] In view of the above background, the present invention aims to enable reinforced concrete beams and floor slabs to be joined together with a simple structure and easily. [Means for solving the problem]

[0006] To solve the above problems, one aspect of the present invention provides a beam-floor joint structure (1) for joining a reinforced concrete beam and a floor, comprising a precast concrete beam member (2), precast concrete floor slabs (3A, 3B) arranged to the side of the beam member, and a plurality of axial force members (4) that join the floor slabs and the beam member to each other.

[0007] In this embodiment, a precast concrete beam member and a precast concrete floor slab are joined to each other by multiple axial force members. As a result, the beam-floor joint structure can easily and simply join reinforced concrete beam members and floor slabs.

[0008] Furthermore, in the above embodiment, the axial force member may be a tensioning member that compresses and joins the floor slab and the beam member to each other.

[0009] According to this embodiment, the floor slab and beam members can be strongly joined to each other.

[0010] Furthermore, in the above embodiment, it is preferable that the axial force member is in an unbonded state and not adheres to the floor slab.

[0011] According to this embodiment, the beam-floor joint structure can be easily dismantled, and the floor slab of the dismantled beam-floor joint structure can be easily reused.

[0012] Furthermore, in the above embodiment, the beam-floor joint structure may further include a bracket (5) attached to the beam member that supports the floor slab from below.

[0013] According to this embodiment, the load of the floor slab positioned to the side of the beam member can be supported by the beam member via a bracket. Therefore, it is not necessary to suspend the floor slab with a crane or the like until it is joined to the beam member, making it easier to join the floor slab to the beam member.

[0014] Furthermore, in the above embodiment, the bracket may be detachably attached to the beam member.

[0015] According to this embodiment, if the brackets become unnecessary after the beam-floor joint structure has been constructed, they can be easily removed. This makes it possible to flatten the sides of the beams and the underside of the floor.

[0016] Furthermore, in the above embodiment, the floor slab may be provided with a plurality of lower recesses (7) that are recessed upward from the lower surface of the floor slab, and floor through-holes (8) that extend from each of the plurality of lower recesses to the side surface of the floor slab on the beam member side, and the beam member may be provided with beam through-holes (6) that penetrate the beam member in the width direction and communicate with the floor through-holes.

[0017] According to this embodiment, the axial force member can be inserted through the floor penetration hole in the floor slab and the beam penetration hole in the beam member, and the end of the axial force member can be locked into the lower recess. This makes it easier to join the beam member and the floor slab to each other with the axial force member.

[0018] Furthermore, in the above embodiment, the floor slabs are arranged on the left and right sides of the beam member, and it is preferable that the lower recess on one side of the floor slab is formed to a position at least a distance (4L-2w) from the side surface of the beam member, which is the length of the axial force member (4L) minus the beam width (2w).

[0019] According to this embodiment, when constructing a beam-floor joint structure, when one end of an axial force member inserted through the beam member and floor slab is brought into close contact with the end of the lower recess in one of the floor slabs, the other end of the axial force member can be kept from protruding from the beam member. In this state, since the axial force member does not protrude from the side of the beam member, it is easy to position the other floor slab on the side of the beam member. Therefore, the floor slabs on the left and right sides of the beam member can be easily positioned on the side of the beam member.

[0020] Furthermore, in the above embodiment, the floor slabs are arranged on the left and right sides of the beam member, and the length (7w) in the width direction of the beam member of the lower recess of one of the floor slabs is preferably longer than the distance (7d) between the lower recess of the other floor slab and the side surface of the beam member.

[0021] According to this embodiment, when one end of the axial force member, which is inserted through the beam member and one of the floor slabs, is brought into close contact with the end of the lower recess in one of the floor slabs, the other end of the axial force member can be kept from protruding from the beam member. In this state, since the axial force member does not protrude from the side of the beam member, it is easy to position the other floor slab to the side of the beam member. Therefore, the floor slabs on the left and right sides of the beam member can be easily positioned to the side of the beam member.

[0022] Furthermore, in the above embodiment, the lower recess includes an inclined surface (16) that slopes away from the beam member as it moves upward, the floor penetration hole is inclined upward as it moves from the lower recess toward the beam member, the beam penetration hole is inclined upward as it moves from the widthwise end toward the widthwise center of the beam member, the end of the axial force member is locked to the inclined surface of the lower recess, and the axial force member extends upward as it moves from the end toward the widthwise center.

[0023] According to this aspect, the downward concave portion includes an inclined surface, and the end portion of the axial force member is locked to the inclined surface of the downward concave portion. When applying a tensile force to the axial force member during the construction of the beam-slab joint structure, a tensile force is applied obliquely downward to the end portion of the axial force member. Here, the position obliquely downward of the end portion of the axial force member is located below the floor slab. Thereby, in the operation of applying a tensile force to the axial force member, a working space can be easily secured.

[0024] Further, in the above aspect, the floor slab includes a plurality of upward concave portions (21) that are recessed downward from the upper surface of the floor slab, and floor through-holes that extend from each of the plurality of upward concave portions to the side surface of the floor slab on the side of the beam member. The beam member may include a beam through-hole that penetrates the beam member in the width direction and communicates with the floor through-hole.

[0025] According to this aspect, the axial force member can be inserted through the floor through-hole of the floor slab and the beam through-hole of the beam member, and the end portion of the axial force member can be locked to the upward concave portion. Thereby, it becomes easy to join the beam member and the floor slab to each other with the axial force member.

[0026] Further, in the above aspect, the upward concave portion includes an inclined surface (22) that inclines away from the beam member as it goes downward, the floor through-hole inclines downward as it goes from the upward concave portion toward the beam member side, the beam through-hole inclines downward as it goes from the width direction end portion of the beam member toward the width direction central portion, the end portion of the axial force member is locked to the inclined surface of the upward concave portion, and the tension member may extend downward as it goes from the end portion toward the width direction central portion.

[0027] According to this aspect, the upward concave portion includes an inclined surface, and the end portion of the tension member is locked to the inclined surface of the upward concave portion. When applying a tensile force to the tension member during the construction of the beam-slab joint structure, a tensile force is applied obliquely upward to the end portion of the axial force member. Here, the position obliquely upward of the end portion of the tension member is located above the floor slab. Thereby, in the operation of applying a tensile force to the tension member, a working space can be easily secured.

Advantages of the Invention

[0028] According to the above embodiment, reinforced concrete beams and floor slabs can be joined easily with a simple structure. [Brief explanation of the drawing]

[0029] [Figure 1] Cross-sectional view showing the schematic configuration of the beam-floor joint structure according to the first embodiment. [Figure 2] Figure 1 shows a schematic diagram of the beam-floor joint structure. [Figure 3] Diagram illustrating the construction method of the beam-floor joint structure shown in Figure 1. [Figure 4] Diagram illustrating the construction method of the beam-floor joint structure shown in Figure 1. [Figure 5] Cross-sectional view showing the schematic configuration of the beam-floor joint structure according to the second embodiment. [Figure 6] Cross-sectional view showing the schematic configuration of the beam-floor joint structure according to the third embodiment. [Figure 7] Cross-sectional view showing the schematic configuration of the beam-floor joint structure according to the fourth embodiment. [Modes for carrying out the invention]

[0030] Hereinafter, several embodiments of the present invention will be described in detail with reference to the drawings. The beam-floor joint structure 1 of the following embodiments is a joint structure for joining a reinforced concrete (RC) beam and a floor.

[0031] ≪First Embodiment≫ A first embodiment of the present invention will be described with reference to Figures 1 and 2. Figure 1 is a cross-sectional view showing the schematic configuration of a beam-floor joint structure 1 according to the first embodiment. Figure 2 is a bottom view showing the schematic configuration of the beam-floor joint structure 1 shown in Figure 1. As shown in Figures 1 and 2, the beam-floor joint structure 1 comprises a beam member 2 made of precast concrete, floor slabs 3A and 3B made of precast concrete arranged on both sides of the beam member 2, a plurality of tensioning members 4 that press-fit the floor slabs 3A and 3B and the beam member 2 together, and brackets 5 that support the floor slabs 3A and 3B from below. In the beam-floor joint structure 1, the plurality of tensioning members 4 are arranged at predetermined intervals in the longitudinal direction of the beam member 2 (see Figure 2). The left and right floor slabs 3A and 3B are distinguished by reference numerals, and if they are not distinguished, they are simply referred to as "floor slab 3". In other embodiments, the floor slab 3 may be arranged on only one side of the beam member 2.

[0032] The beam member 2 is spanned between a pair of columns (not shown), and each of its longitudinal ends is fixed to the columns (not shown). In other words, the beam member 2 is a main beam. In other embodiments, the beam member 2 may be a secondary beam spanned between a pair of main beams. As shown in Figure 1, the cross-section of the beam member 2 is rectangular. The beam member 2 is provided with a plurality of beam through-holes 6 that penetrate the beam member 2 and extend laterally. As shown in Figure 2, the plurality of beam through-holes 6 are arranged at predetermined intervals in the longitudinal direction of the beam member 2.

[0033] The floor slab 3 is made of precast concrete and is equipped with reinforcing bars (not shown) extending in the beam direction and the girder direction. As shown in Figures 1 and 2, the floor slab 3 is provided with a plurality of lower recesses 7 that are recessed upward from the lower surface of the floor slab 3, and floor penetration holes 8 that extend from each of the plurality of lower recesses 7 to the side surface of the floor slab 3 on the beam member 2 side. As shown in Figure 2, the plurality of lower recesses 7 and the plurality of floor penetration holes 8 are arranged at predetermined intervals in the longitudinal direction of the beam member 2. The floor penetration holes 8 are in communication with the beam penetration holes 6 of the beam member 2. In other words, the beam penetration holes 6 of the beam member 2 are in communication with the floor penetration holes 8 of the floor slab 3. The tensioning members 4 are inserted through the beam penetration holes 6 of the beam member 2 and the floor penetration holes 8 of the floor slab 3.

[0034] The tensioning member 4 is made of a PC steel bar, and male threads are formed on both ends thereof. The tensioning member 4 is a type of axial force member. Instead of the tensioning member 4, an axial force member that does not have tension applied to it may be used. Male threads are formed on both ends of this axial force member. At both ends of the tensioning member 4, a fixing device 11 is attached, which includes nuts 9 that are screwed onto the male threads and bearing plates 10 (anchor plates) that the nuts 9 abut against. The fixing device 11 may have a different configuration. In other embodiments, the tensioning member 4 may be made of PC steel wire, PC steel strands, carbon fiber cable, aramid fiber cable, or fibrous reinforcement (fiber cable hardened and integrated with resin or the like).

[0035] The anchoring device 11 at the end of the tensioning member 4 is housed in the lower recess 7 of the floor slab 3. The bearing plate 10 of the anchoring device 11 abuts against the lower recess 7 of the floor slab 3. As a result, the anchoring device 11 is locked into the lower recess 7, and the end of the tensioning member 4 is fixed to the floor slab 3. The lower recess 7 is filled with a filler material 12. The filler material 12 is made of resin or silicone and can be easily removed from the lower recess 7. The floor penetration hole 8 is not filled with the filler material 12. In other words, the tensioning member 4 is in an unbonded state and does not adhere to the floor slab 3. When dismantling the beam-floor joint structure 1, the compression joint between the floor slab 3 and the beam member 2 is released simply by removing the filler material 12 from the lower recess 7 and removing the anchoring device 11 from the tensioning member 4. Since the tensioning member 4 does not adhere to the floor slab 3, the floor slab 3 can be easily removed from the beam member 2. In addition, the removed floor slab 3 can be reused.

[0036] In the embodiment where the floor slab 3 is positioned on only one side of the beam member 2, the anchoring device 11 positioned on the other side is locked to the side surface of the beam member 2, and the end of the tensioning member 4 is fixed to the beam member 2.

[0037] Bracket 5 is detachably attached to beam member 2 and supports floor slab 3 from below. Screw holes may be provided in beam member 2, and bracket 5 may be screwed into the screw holes in beam member 2. Bracket 5 is attached to beam member 2 before floor slab 3 is attached to beam member 2.

[0038] Figures 3 and 4 are explanatory diagrams illustrating the construction method of the beam-floor joint structure 1 shown in Figure 1. The beam member 2 and floor slab 3 are manufactured in advance at a factory or similar facility and transported to the construction site. In the construction of the beam-floor joint structure 1, first, the bracket 5 is attached to the beam member 2. Next, the beam member 2 is fixed to the column (not shown). Next, as shown in Figure 3, the floor slab 3A is placed on one side of the beam member 2 (the left side in Figure 3). Next, the tensioning member 4 is inserted through the floor penetration hole 8 in the floor slab 3A and the beam penetration hole 6 in the beam member 2. Here, one end of the tensioning member 4 is inserted all the way to the back of the lower recess 7 of the floor slab 3A. Next, the floor slab 3B is placed on the other side of the beam member 2.

[0039] Next, as shown in Figure 4, the tension member 4 is moved so that its other end is located in the lower recess 7 of the floor slab 3B. Next, the anchoring device 11 is attached to one end of the tension member 4 (the end on the floor slab 3A side). Next, tension is applied to the tension member 4 from the other end (the end on the floor slab 3B side) using a jack or the like, and the anchoring device 11 is attached to the other end of the tension member 4, fixing the tension member 4 to the floor slab 3. As a result, the floor slabs 3A, 3B and the beam member 2 are compressed and joined together by the tension member 4. At this point, before the anchoring device 11 is attached to the other end of the tension member 4, a filler material such as grout may be injected into the floor penetration holes 8 of the floor slabs 3A and 3B and the beam penetration holes 6 of the beam member 2. Finally, the lower recesses 7 of the floor slabs 3A and 3B are filled with the filler material 12. Furthermore, the bracket 5 may be removed from the beam member 2.

[0040] Alternatively, instead of using the tensioning member 4, the floor slab 3 and beam member 2 may be bolted together using an axial force member that does not apply tension. In this case, no tension is applied to the axial force member, and anchoring devices 11 (including nuts 9) are attached to both ends of the axial force member.

[0041] As shown in Figure 1, floor slabs 3A and 3B are positioned on the left and right sides of the beam member 2, respectively. As shown in Figure 3, the lower recess 7 of floor slab 3A (one of floor slabs 3A or 3B) is formed at a distance of at least the length obtained by subtracting the beam width 2w from the length 4L of the tension member 4 (axial force member) (4L-2w) from the beam width 2w, from the side surface of the beam member 2. Due to this positional relationship, as shown in Figure 3, when one end of the tension member 4 (the left end of the tension member 4 in Figure 3), which is inserted through the beam member 2 and floor slab 3A, is brought into close contact with the end of the lower recess 7 of floor slab 3A (one of the floor slabs), the other end of the tension member 4 (the right end of the tension member 4 in Figure 3) does not protrude from the beam member 2. In this state, since the tension member 4 does not protrude from the side of the beam member 2, it is easy to position the floor slab 3B on the side of the beam member 2. Therefore, the floor slabs 3A and 3B on the left and right sides of the beam member 2 can be easily positioned to the sides of the beam member 2.

[0042] Furthermore, the widthwise length 7w of the lower recess 7 of floor slab 3A (one floor slab) of beam member 2 is longer than the distance 7d between the lower recess 7 of floor slab 3B (the other floor slab) and the side surface of beam member 2 (7w > 7d). Due to this positional relationship of the lower recess 7, as shown in Figure 3, one end of the tension member 4 (axial force member) inserted through beam member 2 and floor slab 3A (the left end of the tension member 4 in Figure 3) can be brought into close contact with the end of the lower recess 7 of floor slab 3A (one floor slab), and further, as shown in Figure 4, one end of the tension member 4 can be positioned in the lower recess 7 of floor slab 3B (the other floor slab). This ensures that the ends of the tension member 4 are reliably positioned in the lower recess 7 of floor slabs 3A and 3B on the left and right sides of beam member 2.

[0043] The operation and effects of the beam-floor joint structure 1, configured as described above, are explained below. In the beam-floor joint structure 1, a precast concrete beam member 2 and a precast concrete floor slab 3 are joined to each other by multiple tensioning members 4 (axial force members). This allows the reinforced concrete beam member 2 and floor slab 3 to be joined with a simple structure and easily.

[0044] In this embodiment, tensioning members 4 are used as axial force members for press-fitting the floor slab 3 and the beam members 2. This allows for a stronger joint between the floor slab 3 and the beam members 2 compared to the case where bolts are used as axial force members (i.e., when nuts 9 are tightened without tensioning by jacks or the like).

[0045] Furthermore, the tensioning members 4 (axial force members) are in an unbonded state, not adhering to the floor slab 3. This makes it easier to dismantle the beam-floor joint structure 1 and to reuse the floor slab 3 of the dismantled beam-floor joint structure 1. By reusing the floor slab 3, the energy required to dispose of the dismantled floor slab 3 can be reduced, and the generation of greenhouse gases that would otherwise be generated during the disposal of the dismantled floor slab 3 can be suppressed.

[0046] The beam-floor joint structure 1 includes a bracket 5 attached to the beam member 2 that supports the floor slab 3 from below. This allows the load of the floor slab 3, which is positioned laterally to the beam member 2, to be supported by the beam member 2 via the bracket 5. Therefore, it is not necessary to suspend the floor slab 3 with a crane or the like until it is joined to the beam member 2, making it easier to join the floor slab 3 to the beam member 2.

[0047] Bracket 5 is detachably attached to beam member 2. This allows bracket 5 to be easily removed if it becomes unnecessary after the beam-floor joint structure 1 has been constructed.

[0048] Furthermore, the floor slab 3 is provided with a plurality of lower recesses 7 and a plurality of floor penetration holes 8, and the beam member 2 is provided with a plurality of beam penetration holes 6. As a result, the tensioning member 4 can be inserted through the floor penetration holes 8 of the floor slab 3 and the beam penetration holes 6 of the beam member 2, and the ends of the tensioning member 4 can be locked into the lower recesses 7. This makes it easy to join the beam member 2 and the floor slab 3 to each other with the tensioning member 4 (axial force member).

[0049] ≪Second Embodiment≫ The beam-floor joint structure 1 of the second embodiment will be described with reference to Figure 5. In the beam-floor joint structure 1 of the second embodiment, elements that are the same as or similar to those in the first embodiment are denoted by the same reference numerals, and redundant explanations are omitted. The same applies to subsequent embodiments unless otherwise specified.

[0050] Figure 5 is a cross-sectional view showing the schematic configuration of the beam-floor joint structure 1 according to the second embodiment. As shown in Figure 5, in the beam-floor joint structure 1 of this embodiment, the lower recess 7 includes an inclined surface 16 that slopes away from the beam member 2 as it moves upward. The floor penetration hole 8 of the floor slab 3 is inclined upward as it moves from the lower recess 7 toward the beam member 2. In addition, the beam penetration hole 6 of the beam member 2 is curved in a direction that is convex upward, and is inclined upward as it moves from the widthwise end of the beam member 2 toward the widthwise center.

[0051] The tensioning member 4 extends upward from the end towards the center in the width direction. The end of the tensioning member 4 is locked to the inclined surface 16 of the lower recess 7. In this embodiment, the tensioning member 4 is made of stranded steel wire. The tensioning member 4 may also be made of PC steel wire, carbon fiber cable, aramid fiber cable, or fibrous reinforcement (fiber cable hardened and integrated with resin or the like).

[0052] In the beam-floor joint structure 1 of this embodiment, the lower recess 7 includes an inclined surface 16, and the end of the tensioning member 4 is locked to the inclined surface 16 of the lower recess 7. When constructing the beam-floor joint structure 1, tension is applied to the end of the tensioning member 4 (axial force member) diagonally downward. Here, the diagonally downward position of the end of the tensioning member 4 is located below the floor slab 3. This makes it easy to secure working space when applying tension to the tensioning member 4. In addition, the volume of the lower recess 7 can be reduced.

[0053] ≪Third Embodiment≫ The beam-floor joint structure 1 of the third embodiment will be described with reference to Figure 6. Figure 6 is a cross-sectional view showing the schematic configuration of the beam-floor joint structure 1 according to the third embodiment. As shown in Figure 6, in the beam-floor joint structure 1 of the third embodiment, the floor slab 3 is provided with a plurality of upper recesses 21 that are recessed downward from the upper surface of the floor slab 3, and floor penetration holes 8 that extend from each of the plurality of upper recesses 21 to the side surface of the floor slab 3 on the beam member 2 side. The plurality of upper recesses 21 and the plurality of floor penetration holes 8 are arranged at predetermined intervals in the longitudinal direction of the beam member 2, similar to the lower recess 7 of the first embodiment (see Figure 2). The tensioning member 4 is inserted through the beam penetration hole 6 of the beam member 2 and the floor penetration hole 8 of the floor slab 3. The ends of the tensioning member 4 are fitted with anchoring devices 11 and locked into the upper recesses 21. The inside of the upper recesses 21 is filled with a filler material 12.

[0054] The upper recess 21 of floor slab 3A (one of floor slabs 3A and 3B) is formed to a position at least the length obtained by subtracting the beam width 2w from the length 4L of the tensioning member 4 (4L-2w) from the beam width 2w. Furthermore, the widthwise length of the upper recess 21 of floor slab 3A (one of the floor slabs) is longer than the distance between the upper recess 21 of floor slab 3B (the other floor slab) and the side surface of the beam member 2.

[0055] The floor slab 3 is provided with a plurality of upper recesses 21 and a plurality of floor penetration holes 8, and the beam member 2 is provided with a plurality of beam penetration holes 6. As a result, the tensioning member 4 can be inserted through the floor penetration holes 8 of the floor slab 3 and the beam penetration holes 6 of the beam member 2, and the ends of the tensioning member 4 can be locked into the upper recesses 21. This makes it easy to join the beam member 2 and the floor slab 3 to each other with the tensioning member 4 (axial force member).

[0056] ≪Fourth Embodiment≫ Referring to Figure 7, the beam-floor joint structure 1 of the fourth embodiment will be described. Figure 7 is a cross-sectional view showing the schematic configuration of the beam-floor joint structure 1 according to the fourth embodiment. As shown in Figure 7, in the beam-floor joint structure 1 of this embodiment, the upper recess 21 includes an inclined surface 22 that slopes away from the beam member 2 as it goes downward. The floor penetration hole 8 of the floor slab 3 is inclined downward as it goes from the upper recess 21 toward the beam member 2. Also, the beam penetration hole 6 of the beam member 2 is inclined downward as it goes from the widthwise end of the beam member 2 toward the widthwise center.

[0057] The tensioning member 4 extends downward from the end towards the center in the width direction. The end of the tensioning member 4 is locked to the inclined surface 22 of the upper recess 21. In this embodiment, the tensioning member 4 is made of stranded steel wire. The tensioning member 4 may also be made of PC steel wire, carbon fiber cable, aramid fiber cable, or fibrous reinforcement (fiber cable hardened and integrated with resin or the like).

[0058] In the beam-floor joint structure 1 of this embodiment, the upper recess 21 includes an inclined surface 22, and the end of the tensioning member 4 is locked to the inclined surface 22 of the upper recess 21. When constructing the beam-floor joint structure 1, tension is applied to the end of the tensioning member 4 (axial force member) in an oblique upward direction. Here, the oblique upward position of the end of the tensioning member 4 is located above the floor slab 3. This makes it easy to secure working space when applying tension to the tensioning member 4. In addition, the volume of the upper recess 21 can be reduced.

[0059] This concludes the description of specific embodiments, but the present invention is not limited to the above embodiments or modifications and can be broadly modified and implemented. For example, in the beam-floor joint structure 1 of the first embodiment, the widthwise length of the lower recess 7 of the beam member 2 may be the same or different in floor slab 3A and floor slab 3B. Also, in the beam-floor joint structure 1 of the third embodiment, the widthwise length of the upper recess 21 of the beam member 2 may be the same or different in floor slab 3A and floor slab 3B.

[0060] Furthermore, the lower recess 7, floor penetration hole 8, and beam penetration hole 6 having the inclined surface 16 of the second embodiment and the upper recess 21, floor penetration hole 8, and beam penetration hole 6 having the inclined surface 22 of the fourth embodiment may be arranged alternately in the longitudinal direction of the beam member 2. In addition, the specific configuration, arrangement, quantity, material of each member or part, the specific work and order of each work, etc., can be changed as appropriate without departing from the spirit of the present invention. Furthermore, some of the configurations of the above embodiments may be combined with other embodiments. Moreover, not all of the components shown in the above embodiments are essential and can be selected as appropriate. [Explanation of Symbols]

[0061] 1:Beam-floor joint structure 2: Beam members 2w: Beam width 3, 3A, 3B: Floor slabs 4: Tension material (axial tension material) 4L: Length of tensioning material 5: Bracket 6: Beam through hole 7: Lower recess 7d: Distance between the lower recess and the side surface of the beam member 7w: Length of the lower recess 8: Floor through hole 16: Inclined surface 21: Upper recess 22: Inclined surface

Claims

1. A beam-floor connection structure for joining a reinforced concrete beam and floor, Precast concrete beam members, A precast concrete floor slab is positioned to the side of the beam member, A beam-floor joint structure comprising a plurality of axial force members that join the floor slab and the beam members to each other.

2. The beam-floor joint structure according to claim 1, wherein the axial force member is a tensioning member that compresses and joins the floor slab and the beam member to each other.

3. The beam-floor joint structure according to claim 1, wherein the axial force member is in an unbonded state and does not adhere to the floor slab.

4. The beam-floor joint structure according to claim 1, further comprising a bracket attached to the beam member and supporting the floor slab from below.

5. The beam-floor joint structure according to claim 4, wherein the bracket is detachably attached to the beam member.

6. The floor slab comprises a plurality of lower recesses that are recessed upward from the lower surface of the floor slab, and floor penetration holes that extend from each of the plurality of lower recesses to the side surface of the floor slab on the beam member side, The beam-floor joint structure according to any one of claims 1 to 5, wherein the beam member comprises a beam through-hole that penetrates the beam member in the width direction and communicates with the floor through-hole.

7. The floor slabs are positioned on the left and right sides of the beam member, The beam-floor joint structure according to claim 6, wherein one of the lower recesses of the floor slab is formed to a position at a distance greater than or equal to the length obtained by subtracting the beam width from the length of the axial force member, from the side surface of the beam member.

8. The floor slabs are positioned on the left and right sides of the beam member, The beam-floor joint structure according to claim 6, wherein the length of the lower recess of one floor slab in the width direction of the beam member is longer than the distance between the lower recess of the other floor slab and the side surface of the beam member.

9. The lower recess includes an inclined surface that slopes away from the beam member as it extends upward, The floor penetration hole is inclined upward as it moves from the lower recess toward the beam member side. The beam penetration hole is inclined upward from the widthwise end of the beam member toward the widthwise center, The end of the axial force member is locked to the inclined surface of the lower recess, The beam-floor joint structure according to claim 6, wherein the axial force member extends upward from the end toward the center in the width direction.

10. The floor slab comprises a plurality of upper recesses that are recessed downward from the upper surface of the floor slab, and floor through holes that extend from each of the plurality of upper recesses to the side surface of the floor slab on the beam member side, The beam-floor joint structure according to any one of claims 1 to 5, wherein the beam member comprises a beam through-hole that penetrates the beam member in the width direction and communicates with the floor through-hole.

11. The upper recess includes an inclined surface that slopes away from the beam member as it extends downward, The floor penetration hole is inclined downwards as it moves from the upper recess toward the beam member side. The beam penetration hole is inclined downward from the widthwise end of the beam member toward the widthwise center, The end of the axial force member is locked to the inclined surface of the upper recess, The beam-floor joint structure according to claim 10, wherein the axial force member extends downward from the end toward the center in the width direction.

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