Beam-bed joint construction

Abstract

To provide 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, comprising a precast concrete beam member (2), a precast concrete floor slab (3) placed on the beam member (2), and a plurality of axial force members (4) that join the floor slab (3) and the beam member (2) to each other.

Description

Technical Field

[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 concrete having 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, the construction is facilitated by placing the same top concrete instead of placing separate top concrete having different design standard strengths on the respective upper surfaces of the half-precast beam and the half-precast floor slab during construction.

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, there is room for improvement because the work of placing concrete on the respective upper surfaces of the half-precast beam and the half-precast floor slab is laborious. And there is a demand for a beam-floor joint structure that has a simple structure and can be easily constructed.

[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), a precast concrete floor slab (3) placed on the beam member, and a plurality of axial force members (4) that join the floor slab 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 together.

[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, it is preferable that the lower part of the axial force member is embedded in the beam member and fixed to the beam member at its lower end.

[0013] According to this embodiment, beam members with the lower part of the axial force member embedded can be manufactured in a factory or other facility. When constructing the beam-floor joint structure at the construction site, the axial force member can be fixed to the floor slab without having to perform the work of fixing the lower end of the axial force member to the beam member. Therefore, the construction of the beam-floor joint structure can be made easier.

[0014] Furthermore, in the above embodiment, the intermediate portion of the floor slab is positioned on the beam member, and the ends of two beam members that are adjacent to each other in a plan view are joined to each other.

[0015] In this embodiment, the floor slab is reliably supported by the beam members.

[0016] Furthermore, in the above embodiment, the ends of two adjacent floor slabs are positioned on the beam member, and the axial force member connects the two floor slabs and the beam member to each other.

[0017] According to this embodiment, the ends of two adjacent floor members can be easily supported by a single beam member.

[0018] Furthermore, in the above embodiment, it is preferable that a groove (16) for receiving the upper part of the beam member is provided on the lower surface of the floor slab.

[0019] According to this embodiment, a groove for receiving the upper part of the beam member is provided in the floor slab, making it easier to position the floor slab in the appropriate location when constructing the beam-floor joint structure.

[0020] Furthermore, in the above embodiment, the axial force member includes a lower axial force member (17) embedded in the beam member and fixed to the beam member at its lower end, and an upper axial force member (18) joined to the upper end of the lower axial force member and fixed to the floor slab, and preferably a mechanical joint (19) for joining the lower axial force member and the upper axial force member is provided at the upper end of the lower axial force member so as not to protrude from the upper surface of the beam member.

[0021] According to this aspect, the lower axial force member and the mechanical joint do not protrude from the beam member. If the lower axial force member and the mechanical joint protrude from the beam member, care must be taken not to damage the lower axial force member and the mechanical joint during the transportation of the beam member. Since a plurality of lower axial force members and mechanical joints do not protrude from the beam member, it can be transported without paying close attention not to damage the lower axial force member and the mechanical joint during the transportation of the beam member. Therefore, it is possible to facilitate the transportation of the beam member together with the plurality of lower axial force members and mechanical joints.

[0022] Further, in the above aspect, it is preferable that the beam member includes a through hole (20) through which the axial force member is inserted.

[0023] According to this aspect, it is possible to first attach the fixture from above the axial force member and then attach the fixture to the lower side of the axial force member, or first attach the fixture from the lower side of the axial force member and then attach the fixture to the upper side of the axial force member. Thereby, the degree of freedom of the construction procedure of the beam-floor joint structure can be increased.

Advantages of the Invention

[0024] According to the above aspect, a reinforced concrete beam and a floor slab can be joined easily with a simple structure.

Brief Description of the Drawings

[0025] [Figure 1] Cross-sectional view showing a schematic configuration of an example of a beam-floor joint structure according to the first embodiment [Figure 2] Plan view showing a schematic configuration of the beam-floor joint structure shown in FIG. 1 [Figure 3] Explanatory drawing for explaining the construction method of the beam-floor joint structure shown in FIG. 1 [Figure 4] Side cross-sectional view showing a schematic configuration of a beam-floor joint structure at the end of a beam member having a widened portion at the end [Figure 5] Cross-sectional view showing a schematic configuration of another example of a beam-floor joint structure according to the first embodiment [Figure 6] Cross-sectional view showing a schematic configuration of a beam-floor joint structure according to the second embodiment [Figure 7] Plan view of the beam-floor joint structure shown in Figure 6. [Figure 8] Cross-sectional view showing the schematic configuration of the beam-floor joint structure according to the first modified example. [Figure 9] Cross-sectional view showing the schematic configuration of the beam-floor joint structure according to the second modified example. [Figure 10] Figure 9 is an explanatory diagram illustrating the construction method of the beam-floor joint structure. [Figure 11] Cross-sectional view showing the schematic configuration of a beam-floor joint structure as an example of the third modified example. [Figure 12] Figure 11 is an explanatory diagram illustrating the construction method of the beam-floor joint structure. [Figure 13] Cross-sectional view showing the schematic configuration of another example of the beam-floor joint structure related to the third modified example. [Figure 14] Cross-sectional view showing the schematic configuration of another example of the beam-floor joint structure related to the third modified example. [Figure 15] Cross-sectional view showing the schematic configuration of another example of the beam-floor joint structure related to the third modified example. [Modes for carrying out the invention]

[0026] Hereinafter, several embodiments and modifications of the present invention will be described in detail with reference to the drawings. The beam-floor joint structure 1 of the following embodiment is a joint structure for joining a reinforced concrete (RC) beam and a floor.

[0027] ≪First Embodiment≫ A first embodiment of the present invention will be described with reference to Figures 1 to 3. Figure 1 is a cross-sectional view showing the schematic configuration of an example beam-floor joint structure 1 according to the first embodiment. Figure 2 is a plan 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, a floor slab 3 made of precast concrete placed on the beam member 2, and a plurality of tension members 4 (axial force members) that press-fit the floor slab 3 and the beam member 2 together. As shown in Figure 2, in the beam-floor joint structure 1, the plurality of tension members 4 are arranged at predetermined intervals in the longitudinal direction of the beam member 2.

[0028] The beam member 2 is spanned between a pair of columns (not shown), and both of its longitudinal ends are 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 lower part of the tensioning member 4 is embedded in the beam member 2.

[0029] 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. The floor slab 3 may be prestressed in the girder direction. As shown in Figures 1 and 2, the floor slab 3 is provided with a plurality of accommodating through holes 5 for accommodating the upper ends of the tensioning members 4. As shown in Figure 2, the plurality of accommodating through holes 5 are arranged at predetermined intervals in the longitudinal direction of the beam member 2. As shown in Figure 1, the accommodating through holes 5 have a stepped portion 5A. The cross-section of the upper portion of the accommodating through hole 5 is rectangular, and the cross-section of the lower portion is circular, with respect to the stepped portion 5A. The diameter of the circle inscribed in the upper portion of the accommodating through hole 5 (hereinafter referred to as the inner diameter) is larger than the inner diameter of the lower portion.

[0030] The middle section of the floor slab 3 is positioned on the beam member 2. The floor slab 3 is supported from below by the beam member 2 at its middle section. As shown in Figure 2, the ends of two adjacent floor slabs 3 in plan view are joined together by joint material 6. The ends of the floor slabs 3 are located approximately in the center of the span between adjacent beam members 2. The relative position of the ends of the floor slabs 3 with respect to the span between the beam members 2 can be changed as appropriate.

[0031] 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. As shown in Figure 1, anchoring devices 9, which include nuts 7 that screw onto the male threads and bearing plates 8 (anchor plates) that the nuts 7 abut against, are attached to both ends of the tensioning member 4. The anchoring devices 9 may have different configurations. In other embodiments, the tensioning member 4 may be made of PC steel strands, carbon fiber cables, aramid fiber cables, or fibrous reinforcing bars (fiber cables hardened and integrated with resin or the like).

[0032] The anchoring device 9 attached to the upper end of the tensioning member 4 is housed in the receiving through-hole 5 of the floor slab 3. In the anchoring device 9 attached to the upper end of the tensioning member 4, the bearing plate 8 abuts against the stepped portion 5A of the receiving through-hole 5. This locks the anchoring device 9 into the stepped portion 5A of the receiving through-hole 5, and the end of the tensioning member 4 is fixed to the floor slab 3. The lower part of the tensioning member 4 is embedded in the beam member 2 and fixed to the beam member 2 at its lower end. In other embodiments, the bearing plate 8 may be omitted from the anchoring device 9 at the lower end of the tensioning member 4, or the anchoring device 9 may be omitted, and the lower part of the tensioning member 4 attached to the beam member 2 may be fixed to the beam member 2 with a predetermined fixing length.

[0033] As shown in Figure 1, the upper part of the receiving through-hole 5 in the floor slab 3 is filled with a filler material 10. The filler material 10 is made of resin or silicone and can be easily removed from the receiving through-hole 5. On the other hand, the lower part of the receiving through-hole 5 in the floor slab 3 is not filled with filler material 10. That is, 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 10 from the receiving through-hole 5 and removing the nut 7 on the upper side of 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. Furthermore, the removed floor slab 3 can be reused.

[0034] Figure 3 is an explanatory diagram illustrating the construction method of the beam-floor joint structure 1 shown in Figure 1. The beam member 2, in which the lower parts of multiple tension members 4 are embedded, and the floor slab 3, which is provided with a housing through-hole 5, are manufactured in advance at a factory or similar facility and transported to the construction site. At the construction site, the beam member 2 is fixed to the column (not shown). In the construction of the beam-floor joint structure 1, first, the floor slab 3 is placed on top of the beam member 2. Next, each tension member 4 is fixed to the floor slab 3. That is, tension is applied to the tension member 4, and a fixing device 9 is attached to the upper end of the tension member 4 in the state in which tension is applied, thereby fixing the tension member 4 to the floor slab 3. In this way, the floor slab 3 and the beam member 2 are compressed and joined to each other by the tension members 4. Here, the floor slab 3 and the beam member 2 may be bolted to each other. Specifically, instead of the tension member 4, an axial force member that does not apply tension may be used, and a fixing device 9 (including a nut 7) may be attached to the upper end of the axial force member, thereby fixing the axial force member to the floor slab 3. Finally, the upper part of the receiving through-hole 5 is filled with the filler material 10.

[0035] In this embodiment, the cross-section of the beam member 2 is rectangular, but the shapes of the beam member 2 and the floor slab 3 can be changed as appropriate. For example, notches may be provided in the beam member 2 and the floor slab 3. In addition, a widened portion 2A that protrudes in the width direction may be provided in the beam member 2 at its end.

[0036] Figure 4 is a side cross-sectional view showing the schematic configuration of the beam-floor joint structure 1 at the end of a beam member 2 having a widened section 2A at its end. The end of the beam member 2 is joined to a column. Figure 4 shows the end of the beam member 2 joined to a column (not shown) at the back of the page, and this end of the beam member 2 is provided with widened sections 2A that are widened on both sides in the width direction for joining to the column. On each of the left and right portions of the widened section 2A, there are a plurality of tensioning members 11 and a plurality of anchoring devices 12 attached to the ends of the tensioning members 11 for press-fitting the column (not shown) and the beam member 2 together. The tensioning members 4 of the beam-floor joint structure 1 extend vertically, and the tensioning members 11 of the column-beam joint structure extend horizontally.

[0037] The work of fixing the tensioning member 4 of the beam-floor joint structure 1 to the floor slab 3 is performed on top of the beam member 2, while the work of fixing the tensioning member 11 of the column-beam joint structure to the beam member 2 is performed beside the beam member 2. Therefore, when fixing the tensioning member 4 of the beam-floor joint structure 1, the tensioning member 11 of the column-beam joint structure is less likely to get in the way of the work. Also, when fixing the tensioning member 11 of the column-beam joint structure, the tensioning member 4 of the beam-floor joint structure 1 is less likely to get in the way of the work. Accordingly, the order of the work of constructing the beam-floor joint structure 1 and the work of constructing the column-beam joint structure can be changed as appropriate.

[0038] Figure 5 is a cross-sectional view showing the schematic configuration of another example of the beam-floor joint structure 1 according to the first embodiment. In the beam-floor joint structure 1 shown in Figure 5, the end of the floor slab 3 is located at approximately 1 / 4 (1 / 4S) of the span S between adjacent beam members 2. Generally, the bending moment of the floor slab 3 is small at approximately 1 / 4 of the span. Therefore, by positioning the end of the floor slab 3 at approximately 1 / 4 of the span S, two adjacent floor slabs 3 are stably joined to each other.

[0039] 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.

[0040] A tensioning member 4 is used to compress and join the floor slab 3 and the beam member 2. This allows for a strong joint between the floor slab 3 and the beam member 2.

[0041] Furthermore, the tensioning material 4 is kept unbonded 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 from disposing of the dismantled floor slab 3 can be suppressed.

[0042] Furthermore, the lower part of the tensioning member 4 is embedded in the beam member 2 and fixed to the beam member 2 at its lower end. This allows the beam member 2 with the lower part of the tensioning member 4 embedded to be manufactured in a factory or other facility. When constructing the beam-floor joint structure 1 at the construction site, the tensioning member 4 can be fixed to the floor slab 3 without having to perform the task of fixing the lower end of the tensioning member 4 to the beam member 2. Therefore, the construction of the beam-floor joint structure 1 can be made easier.

[0043] Furthermore, the middle section of the floor slab 3 is positioned on top of the beam member 2, and the ends of two adjacent beam members 2 in a plan view are joined to each other. As a result, the floor slab 3 is securely supported by the beam members 2.

[0044] ≪Second Embodiment≫ The beam-floor joint structure 1 of the second embodiment will be described with reference to Figures 6 and 7. The difference between the beam-floor joint structure 1 of the second embodiment and the beam-floor joint structure 1 of the first embodiment is that two adjacent floor slabs 3A and 3B are placed on top of the beam member 2. In the beam-floor joint structure 1 of the second embodiment, elements that are the same or similar as in the first embodiment are denoted by the same reference numerals, and redundant explanations are omitted. The same applies to the following embodiments and modifications unless otherwise specified. 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".

[0045] Figure 6 is a cross-sectional view showing the schematic configuration of the beam-floor joint structure 1. Figure 7 is a plan view of the beam-floor joint structure 1. As shown in Figures 6 and 7, the ends of two adjacent floor slabs 3A and 3B are placed on the beam member 2. Each of the floor slabs 3A and 3B is provided with a plurality of accommodating grooves 13 that are recessed inward from the end. The accommodating grooves 13 of floor slab 3A and the accommodating grooves 13 of floor slab 3B are located opposite each other and cooperate to form accommodating through holes 14. As shown in Figure 7, the plurality of accommodating grooves 13 (accommodating through holes 14) are arranged at predetermined intervals in the longitudinal direction of the beam member 2. As shown in Figure 6, the accommodating grooves 13 have stepped portions 13A. The depth of the grooves of the accommodating grooves 13 is shallower below the stepped portion 13A than above it. Therefore, the inner diameter of the upper portion of the accommodating through hole 14 is larger than the inner diameter of the lower portion. Furthermore, the upper portion of the stepped section 13A of the housing through-hole 14 is filled with filler material 10.

[0046] The anchoring device 9 attached to the upper end of the tensioning member 4 is housed in the housing through hole 14. In the anchoring device 9 attached to the upper end of the tensioning member 4, the bearing plate 8 abuts against the stepped portion 13A of the housing through hole 14. As a result, the anchoring device 9 is locked to the stepped portion 13A of the housing through hole 14, and the upper end of the tensioning member 4 is fixed to the floor slabs 3A and 3B, respectively. The tensioning member 4 (axial force member) presses and joins the two floor slabs 3A and 3B and the beam member 2 together. In addition, the ends of the two adjacent floor slabs 3A and 3B on the beam member 2 are joined together by the filler material 10.

[0047] Similar to the beam-floor joint structure 1 of Embodiment 1, the filler material 10 can be easily removed from the housing through-hole 14. The tensioning member 4 (axial force member) is in an unbonded state and does not adhere to the floor slabs 3A and 3B. When dismantling the beam-floor joint structure 1, the compression joint between the floor slabs 3A and 3B and the beam member 2 is released simply by removing the filler material 10 from the housing through-hole 14 and then removing the upper nut 7 of 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. Furthermore, the removed floor slab 3 can be reused.

[0048] In the beam-floor joint structure 1 of this embodiment, the tensioning member 4 (axial force member) compresses and joins (connects) the two floor slabs 3A and 3B and the beam member 2 to each other. This makes it easy to support the ends of two adjacent floor slabs 3A and 3B with a single beam member 2.

[0049] ≪First Variation≫ The beam-floor joint structure 1 of the first modified example will be described with reference to Figure 8. Figure 8 is a cross-sectional view showing the schematic configuration of the beam-floor joint structure 1 according to the first modified example. The difference between the beam-floor joint structure 1 of the first modified example and the beam-floor joint structure 1 of the first embodiment is that a groove 16 for receiving the upper part of the beam member 2 is provided on the lower surface of the floor slab 3. The presence of the groove 16 for receiving the upper part of the beam member 2 in the floor slab 3 makes it easier to position the floor slab 3 in the appropriate location when constructing the beam-floor joint structure 1.

[0050] ≪Second variation≫ A second modified beam-floor joint structure 1 will be described with reference to Figures 9 and 10. The difference between the second modified beam-floor joint structure 1 and the beam-floor joint structure 1 of the first embodiment is that the tensioning member 4 includes a lower tensioning member 17 (lower axial force member) embedded in the beam member 2 and an upper tensioning member 18 (upper axial force member) connected to the upper end of the lower tensioning member 17.

[0051] Figure 9 is a cross-sectional view showing the schematic configuration of a beam-floor joint structure 1 according to a second modified example. The tensioning member 4 includes a lower tensioning member 17 embedded in the beam member 2 and anchored to the beam member 2 at its lower end, an upper tensioning member 18 joined to the upper end of the lower tensioning member 17 and anchored to the floor slab 3, and a mechanical joint 19 that joins the lower tensioning member 17 and the upper tensioning member 18. The mechanical joint 19 is provided at the upper end of the lower tensioning member 17 so as not to protrude from the upper surface of the beam member 2. The mechanical joint 19 is, for example, a sleeve or a coupler. Figure 9 shows a coupler as an example of the mechanical joint 19. The coupler is formed in a cylindrical shape and has an inner hole extending in the axial direction, and joins the lower tensioning member 17 and the upper tensioning member 18, which are inserted into the inner hole, in a state where they are arranged coaxially with each other.

[0052] Figure 10 is an explanatory diagram illustrating the construction method of the beam-floor joint structure 1 shown in Figure 9. A beam member 2, in which multiple lower tensioning members 17 are embedded together with mechanical joints 19, and a floor slab 3, which is provided with a housing through-hole 5, are manufactured in a factory and transported to the construction site.

[0053] At the construction site, the beam member 2 is fixed to the column (not shown). In constructing the beam-floor joint structure 1, the floor slab 3 is first placed on top of the beam member 2. Here, since the mechanical joint 19 and the lower tensioning member 17 do not protrude from the upper surface of the beam member 2, the floor slab 3 can be placed on top of the beam member 2 and slid on top of the beam member 2 to move the floor slab 3 to the appropriate position. This makes it easy to position the floor slab 3.

[0054] Next, a tension member 4 is created by connecting each of the multiple mechanical joints 19 embedded in the beam member 2 to the upper tension member 18. Here, the upper tension member 18 is inserted through each of the receiving through holes 5 in the floor slab 3. Next, tension is applied to the tension member 4, and the tension member 4 is fixed to the floor slab 3 by attaching a fixing device 9 to the upper end of the tension member 4 while tension is applied. As a result, the floor slab 3 and the beam member 2 are compressed and joined together by the tension member 4. Finally, the receiving through holes 5 are filled with filler material 10.

[0055] Furthermore, after constructing the beam-floor joint structure 1, the beam member 2 to which the floor slab 3 is joined by the beam-floor joint structure 1 may be fixed to the column. Alternatively, before placing the floor slab 3 on the beam member 2, the mechanical joint 19 embedded in the beam member 2 and the upper tensioning member 18 may be connected to create the tensioning member 4. In this case, after the mechanical joint 19 and the upper tensioning member 18 are connected, the floor slab 3 is placed on the beam member 2, tension is applied to the tensioning member 4, the anchoring device 9 is attached to the tensioning member 4, and the tensioning member 4 is fixed to the floor slab 3. Alternatively, the floor slab 3 and the beam member 2 may be bolted to each other. Specifically, instead of the tensioning member 4, an axial force member that does not apply tension may be used, and the anchoring device 9 (including the nut 7) may be attached to the upper end of the axial force member to fix the axial force member to the floor slab 3.

[0056] In beam-floor joint structure 1, the lower tensioning members 17 and mechanical joints 19 do not protrude from the beam member 2. If the lower tensioning members 17 and mechanical joints 19 were to protrude from the beam member 2, care would need to be taken to avoid damaging them during the transportation of the beam member 2. Since multiple lower tensioning members 17 and mechanical joints 19 do not protrude from the beam member 2, the beam member 2 can be transported without requiring excessive care to avoid damaging the lower tensioning members 17 and mechanical joints 19. Therefore, it is possible to transport the beam member 2 together with multiple lower tensioning members 17 and mechanical joints 19.

[0057] Furthermore, a beam-floor joint structure 1 can be constructed in which some of the lower tension members 17 embedded in the beam member 2 are connected to the upper tension members 18, rather than connecting all of them. Since the lower tension members 17 and the mechanical joints 19 do not protrude from the beam member 2, the mechanical joints 19 to which the upper tension members 18 are not connected do not obstruct the close contact between the beam member 2 and the floor slab 3. In addition, the upper side of the mechanical joints 19 that are not connected to the upper tension members 18 may be sealed with a filler material 10 or the like to prevent rust.

[0058] ≪Third Variation≫ The third modified beam-floor joint structure 1 will be described with reference to Figures 11-15. The difference between the third modified beam-floor joint structure 1 and the beam-floor joint structure 1 of the first embodiment is that the beam member 2 is provided with a housing through-hole 20 (through-hole).

[0059] Figure 11 is a cross-sectional view showing the schematic configuration of a beam-floor joint structure 1 according to the third modified example. As shown in Figure 11, the beam member 2 is provided with a plurality of housing through-holes 20 through which tensioning members 4 (axial force members) are inserted. The plurality of housing through-holes 20 are arranged at predetermined intervals in the longitudinal direction of the beam member 2. The housing through-holes 20 have a stepped portion 20A at the bottom. The cross-section of the upper portion of the housing through-hole 20 with respect to the stepped portion 20A is rectangular, and the cross-section of the lower portion is circular. The inner diameter of the upper portion of the housing through-hole 20 is smaller than the inner diameter of the lower portion. In the anchoring device 9 attached to the lower end of the tensioning member 4, the bearing plate 8 abuts against the stepped portion 20A. As a result, the anchoring device 9 is locked to the stepped portion 20A of the housing through-hole 20, and the lower end of the tensioning member 4 is fixed to the beam member 2. The housing through-holes 20 are filled with a filler material 10.

[0060] Figure 12 is an explanatory diagram illustrating the construction method of the beam-floor joint structure 1 shown in Figure 11. The beam member 2, which has multiple accommodating through holes 20, and the floor slab 3, which has accommodating through holes 5, are manufactured in advance at a factory or similar facility and transported to the construction site. At the construction site, the beam member 2 is fixed to the column (not shown). In the construction of the beam-floor joint structure 1, first, the floor slab 3 is placed on top of the beam member 2. Next, each of the tensioning members 4 is anchored to the beam member 2 and the floor slab 3. Specifically, the tensioning members 4 are inserted through the accommodating through holes 20 in the beam member 2 and the accommodating through holes 5 in the floor slab 3, and anchoring devices 9 are attached to the upper and lower ends of the tensioning members 4. Then, tension is applied to the tensioning member 4 by taking a reaction force from one of the anchoring devices 9 (for example, the lower one). With the tension applied, the nut 7 of the other anchoring device 9 (in this case, the upper one) is tightened, and the end of the anchoring device 9 is anchored to the corresponding RC member (in this case, the floor slab 3). As a result, the tensioning member 4 is fixed to the floor slab 3. This causes the floor slab 3 and the beam member 2 to be compressed and joined together by the tensioning member 4. Then, the receiving through hole 5 is filled with the filler material 10.

[0061] Furthermore, after constructing the beam-floor joint structure 1, the beam member 2 to which the floor slab 3 is joined by the beam-floor joint structure 1 may be fixed to the column. Also, a filler material such as grout may be injected into the housing through-hole 20 of the beam member 2. Specifically, a tensioning member 4 may be inserted through the housing through-hole 20 of the beam member 2 and the housing through-hole 5 of the floor slab 3, a fixing device 9 may be attached to the lower end of the tensioning member 4, a filler material such as grout may be injected into the housing through-hole 20 to apply tension to the tensioning member 4, and a fixing device 9 may be attached to the upper end of the tensioning member 4 while tension is applied.

[0062] Alternatively, instead of using the tensioning member 4, an axial force member that does not apply tension may be used, and the floor slab 3 and beam member 2 may be bolted together. Specifically, an axial force member that does not apply tension may be used instead of the tensioning member 4, and a fixing device 9 (including a nut 7) may be attached to the upper end of the axial force member, thereby fixing the axial force member to the floor slab 3.

[0063] Figure 13 is a cross-sectional view showing the schematic configuration of another example of the beam-floor joint structure 1 according to the third modified example. In the beam-floor joint structure 1 shown in Figure 13, the housing through-hole 5 of the floor slab 3 does not have a stepped portion 5A. The bearing plate 8 of the anchoring device 9 at the upper end of the tensioning member 4 abuts against the upper surface of the floor slab 3. As a result, the anchoring device 9 is locked to the upper surface of the floor slab 3, and the upper end of the tensioning member 4 is fixed to the floor slab 3. In the anchoring device 9 attached to the lower end of the tensioning member 4, the bearing plate 8 abuts against the lower surface of the stepped portion 20A. As a result, the anchoring device 9 is locked to the stepped portion 20A of the housing through-hole 20, and the lower end of the tensioning member 4 is fixed to the beam member 2. The housing through-hole 20 is filled with a filler material 10. The housing through-hole 20 of the beam member 2 may be filled with a filler material such as grout.

[0064] Figure 14 is a cross-sectional view showing the schematic configuration of another example of the beam-floor joint structure 1 according to the third modified example. In the beam-floor joint structure 1 shown in Figure 14, the housing through-hole 20 of the beam member 2 does not have a stepped portion 20A. The bearing plate 8 of the anchoring device 9 at the lower end of the tensioning member 4 abuts against the lower surface of the beam member 2. As a result, the anchoring device 9 is locked to the lower surface of the beam member 2, and the lower end of the tensioning member 4 is fixed to the beam member 2. In addition, the bearing plate 8 of the anchoring device 9 attached to the upper end of the tensioning member 4 abuts against the stepped portion 5A. As a result, the anchoring device 9 is locked to the stepped portion 5A of the housing through-hole 20, and the upper end of the tensioning member 4 is fixed to the floor slab 3. The housing through-hole 20 of the beam member 2 may be filled with a filler material such as grout.

[0065] Figure 15 is a cross-sectional view showing the schematic configuration of another example of the beam-floor joint structure 1 according to the third modified example. In the beam-floor joint structure 1 shown in Figure 15, the housing through-hole 5 of the floor slab 3 does not have a stepped portion 5A, and the housing through-hole 20 of the beam member 2 does not have a stepped portion 20A. The bearing plate 8 of the anchoring device 9 at the upper end of the tensioning member 4 abuts against the upper surface of the floor slab 3. This locks the anchoring device 9 onto the upper surface of the floor slab 3, and the upper end of the tensioning member 4 is fixed to the floor slab 3. The bearing plate 8 of the anchoring device 9 at the lower end of the tensioning member 4 abuts against the lower surface of the beam member 2. This locks the anchoring device 9 onto the lower surface of the beam member 2, and the lower end of the tensioning member 4 is fixed to the beam member 2. The housing through-hole 20 of the beam member 2 and the housing through-hole 5 of the floor slab 3 may be filled with a filler material such as grout.

[0066] In this modified beam-floor joint structure 1, the beam member 2 is provided with a accommodating through-hole 20 (through-hole). As a result, the anchoring device 9 can be attached to the upper side of the tensioning member 4 first and then to the lower side of the tensioning member 4, or the anchoring device 9 can be attached to the lower side of the tensioning member 4 first and then to the upper side of the tensioning member 4. This increases the degree of freedom in the construction procedure of the beam-floor joint structure 1.

[0067] This concludes the description of specific embodiments. However, 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 modified example, a groove 16 for receiving the upper part of the beam member 2 is provided on the lower surface of the floor slab 3. However, in the second embodiment, grooves for receiving the upper part of the beam member 2 may be provided at the ends of the floor slabs 3A and 3B, recessed inward from the corners. In addition, the specific configuration, arrangement, quantity, material, specific work and order of each member and part, 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]

[0068] 1:Beam-floor joint structure 2: Beam members 3, 3A, 3B: Floor slabs 4: Tension material (axial tension material) 11: Tensile material 16: Groove 17: Lower tension member (lower axial tension member) 18: Upper tension member (upper axial tension member) 19: Mechanical couplings

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 placed on 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 together.

3. The beam-floor joint structure according to claim 1 or 2, 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 or 2, wherein the lower part of the axial force member is embedded in the beam member and fixed to the beam member at its lower end.

5. The beam-floor joint structure according to claim 1 or 2, wherein the intermediate portion of the floor slab is positioned on the beam member, and the ends of two beam members adjacent to each other in a plan view are joined to each other.

6. The beam-floor joint structure according to claim 1 or 2, wherein the ends of two adjacent floor slabs are placed on the beam member, and the axial force member connects the two floor slabs and the beam member to each other.

7. The beam-floor joint structure according to claim 1 or 2, wherein a groove for receiving the upper part of the beam member is provided on the lower surface of the floor slab.

8. The axial force member includes a lower axial force member embedded in the beam member and fixed to the beam member at its lower end, and an upper axial force member joined to the upper end of the lower axial force member and fixed to the floor slab. The beam-floor joint structure according to claim 1 or 2, wherein a mechanical joint for joining the lower axial force member and the upper axial force member is provided at the upper end of the lower axial force member so as not to protrude from the upper surface of the beam member.

9. The beam-floor joint structure according to claim 1 or 2, wherein the beam member has a through hole through which the axial force member is inserted.

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