Beam and slab joint structure

Abstract

To eliminate or reduce concrete casting work for attaching a precast concrete made slab to a beam.SOLUTION: A junction structure 20 of a beam and slab comprises: a beam 16; a precast made slab 18 mounted on the beam 16; a hole 26 penetrating the slab 18 and formed so as to be located on the beam 16; a shear force transmission member 28 where its lower end is embedded in the beam 16 and its upper end is inserted to the hole 26, and first open holes 40 penetrating the upper end in a crosswise direction Y orthogonal to a beam length direction X are formed on a first surface part 36 along the beam length direction X; and a filling material 30 filled within the hole 26.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a joint structure between a beam and a slab. [Background technology]

[0002] Conventionally, a precast concrete slab placed on a beam is joined to the beam by placing a pair of slabs on both ends of the beam in the width direction with their end faces facing each other, and pouring concrete between the end faces of the opposing slabs (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-165860 [Patent Document 2] JP 2009-155850 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, with this joining method, concrete must be poured to join the precast concrete slab to the beam, which is time-consuming.

[0005] In consideration of the above, an object of the present invention is to eliminate or reduce the concrete pouring work required to join a precast concrete slab to a beam. [Means for solving the problem]

[0006] The beam-to-slab joint structure of the first embodiment comprises a reinforced concrete beam, a precast reinforced concrete slab placed on the beam, a hole formed through the slab so as to be positioned on the beam, a shear force transmission member having a lower end embedded in the beam and an upper end inserted into the hole, and having a first surface portion along the beam length direction of the beam, and a first through hole formed in the first surface portion that penetrates the upper end in a horizontal direction perpendicular to the beam length direction of the beam, and a filling material filled in the hole into which the upper end of the shear force transmission member is inserted.

[0007] According to the beam-slab joint structure of the first aspect, the shear force transmission member can connect the slab to the beam so that the beam is rigid in the beam length direction, and the beam and the slab can be highly integrated. This allows the slab cross section to be taken into account in the beam stiffness evaluation, and further allows the slab reinforcing bars to be taken into account in the beam strength evaluation.

[0008] In addition, since the slab is joined to the beam by filling the hole into which the upper end of the shear force transmission member is inserted with filler material, the concrete pouring work for joining the slab to the beam can be eliminated or reduced.

[0009] The beam-to-slab joint structure of the second aspect is the beam-to-slab joint structure of the first aspect, wherein the shear force transmission member has a second surface portion perpendicular to the first surface portion, and a second through hole penetrating the upper end portion in the beam length direction of the beam is formed in the second surface portion.

[0010] According to the beam-to-slab joint structure of the second aspect, the shear force transmission member enables the slab to be joined to the beam so as to be rigid in the lateral direction perpendicular to the beam length direction of the beam.

[0011] The beam-to-slab joint structure of the third aspect is the beam-to-slab joint structure of the second aspect, in which the shear force transmission member is an angle iron, and the first through hole is formed in one side of the angle iron, and the second through hole is formed in the other side of the angle iron.

[0012] According to the third aspect of the beam-to-slab joint structure, by forming a first through hole on one side of the angle iron and forming a second through hole on the other side of the angle iron, through holes can be easily formed in the horizontal direction perpendicular to the beam length direction of the beam and in the beam length direction of the beam. Effect of the Invention

[0013] Since the present invention has the above-mentioned configuration, it is possible to eliminate or reduce the concrete pouring work required to join a precast concrete slab to a beam. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a plan view showing a standard floor of a building according to one embodiment. [Diagram 2] FIG. 2 is a plan view showing a joint structure between a beam and a slab according to one embodiment. [Diagram 3] 3 is a cross-sectional view taken along line 3-3 of FIG. 2. [Figure 4] 4(a) to (c) are perspective views showing a shear force transmission member according to one embodiment. [Diagram 5] FIG. 2 is a perspective view showing a slab-to-slab joint structure according to one embodiment. [Figure 6] FIG. 2 is a plan view showing a slab-to-slab joint structure according to one embodiment. [Figure 7] 7(a) to (c) are side views showing a construction procedure for joining slabs together. [Figure 8] FIG. 2 is a side view showing a joint structure between a column and a slab according to one embodiment. [Figure 9] FIG. 2 is a plan view showing a joint structure between a column and a slab according to one embodiment. [Figure 10] 10(a) to (d) are elevation views showing a construction procedure for a building according to one embodiment. [Figure 11] 1 is a front cross-sectional view showing a variation of a joint structure between a beam and a slab according to one embodiment. FIG. [Figure 12]1 is a front cross-sectional view showing a variation of a joint structure between a beam and a slab according to one embodiment. FIG. [Figure 13] FIG. 11 is a side view showing a variation of a joint structure between a column and a slab according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, a beam-to-slab joint structure according to one embodiment will be described with reference to the drawings.

[0016] The plan view of Fig. 1 shows a standard floor 12 of a building 10. The standard floor 12 is composed of precast reinforced concrete columns 14, fully precast reinforced concrete beams 16 erected between adjacent columns 14, and a fully precast concrete slab (hereinafter referred to as a "PCa slab 18") supported by the beams 16.

[0017] The PCa slab 18 is joined to the beam 16 by a beam-to-slab joint structure 20, adjacent PCa slabs 18 are joined to each other by a slab-to-slab joint structure 22, and the PCa slab 18 is joined to the column 14 by a column-to-slab joint structure 24.

[0018] (Beam and slab joint structure) As shown in the plan view of Figure 2 and Figure 3, which is a cross-sectional view along line 3-3 of Figure 2, the beam-to-slab joint structure 20 is composed of a beam 16, a PCa slab 18 placed on the beam 16, a hole 26 formed by penetrating the PCa slab 18 in the vertical direction so as to be located on the beam 16, an angle iron 28 as a shear force transmission member, and concrete 30 as a filler material.

[0019] As shown in the perspective view of Fig. 4(a), the angle iron 28 is a member formed by connecting a flat plate portion 32 made of a steel plate constituting one side and a flat plate portion 34 made of a steel plate constituting the other side at right angles to form an L-shaped structural cross section. The angle iron 28 has a first surface portion 36 that constitutes the outer surface of the flat plate portion 32, and a second surface portion 38 that constitutes the outer surface of the flat plate portion 34 and is perpendicular to the first surface portion 36.

[0020] As shown in Fig. 3, the lower end of the angle iron 28 is embedded in the beam 16, and the upper end is inserted into the hole 26. In this state, as shown in Fig. 2, the first surface portion 36 is disposed along the beam length direction of the beam 16 (hereinafter referred to as "beam length direction X"), and the second surface portion 38 is disposed along the beam width direction of the beam 16 (hereinafter referred to as "beam width direction Y"), which is a horizontal direction perpendicular to the beam length direction X.

[0021] As shown in FIG. 4(a), a first through hole 40 is formed in a first surface portion 36 of the angle iron 28, penetrating the angle iron 28 in the beam width direction Y, and a second through hole 42 is formed in a second surface portion 38 of the angle iron 28, penetrating the angle iron 28 in the beam length direction X. That is, the first through hole 40 is formed in one side portion of the angle iron 28, and the second through hole 42 is formed in the other side portion of the angle iron 28. As shown in FIG. 3, the first through hole 40 and the second through hole 42 formed in the upper end portion of the angle iron 28 are arranged within the hole 26.

[0022] As shown in Figs. 2 and 3, concrete 30 as a filler is filled into the hole 26 into which the upper end of the angle iron 28 is inserted and is then hardened.

[0023] 2 and 3, reinforcing bars 44 are embedded in the PCa slab 18 so as to be arranged around the hole 26 on all four sides. The reinforcing bars 44 can reinforce the PCa slab 18 around the hole 26 and can also promote the transmission of force from the beam 16 to the PCa slab 18.

[0024] (Slab-to-slab joint structure) As shown in the oblique view of Figure 5 and the plan view of Figure 6, one PCa slab 18 (hereinafter referred to as "PCa slab 18A") and the other PCa slab 18 (hereinafter referred to as "PCa slab 18B") arranged opposite each other are joined by a slab-to-slab joining structure 22.

[0025] The slab-to-slab joint structure 22 is composed of a loop joint bar 48 provided on the PCa slab 18A and protruding from an end face 46 of the PCa slab 18A, a loop joint bar 52 provided on the PCa slab 18B and protruding from an end face 50 of the PCa slab 18B, a base plate portion 54 protruding from the end face 46 of the PCa slab 18A and provided below the loop joint bar 48, a base plate portion 56 protruding from the end face 50 of the PCa slab 18B and provided below the loop joint bar 52, a filler portion 58 formed between the end face 46 of the PCa slab 18A and the end face 50 of the PCa slab 18B, and concrete 60 poured into the filler portion 58 and hardened.

[0026] As shown in FIG. 6, the loop joint bars 48 and the loop joint bars 52 are arranged alternately in the beam width direction Y so as to overlap each other by a predetermined length T1.

[0027] As shown in the side view of Figure 7(a), the length L1 of the bottom plate portion 54 of the PCa slab 18A is shorter than the length D1 of the loop joint reinforcement 48, and the length L2 of the bottom plate portion 56 of the PCa slab 18B is approximately the same as the length D2 of the loop joint reinforcement 52.

[0028] The PCa slabs 18A and 18B are joined by the construction procedure shown in the side views of Figures 7(a) to (c). First, as shown in Figure 7(a), in the first step, with the PCa slab 18B installed in a predetermined position, the PCa slab 18A is dropped straight down from above so that the end face 84 of the bottom plate portion 54 of the PCa slab 18A butts against the end face 86 of the bottom plate portion 56 of the PCa slab 18B. At this time, the loop joint bars 48 of the PCa slab 18A are dropped straight down so as not to interfere with the loop joint bars 52 of the PCa slab 18B.

[0029] Next, in a second step, as shown in Fig. 7(b), concrete 60 is poured into the filling portion 58 by casting in place and allowed to harden, thereby joining the PCa slab 18A and the PCa slab 18B together as shown in Fig. 7(c).

[0030] In the slab-to-slab joint structure 22, as shown in Fig. 6, by connecting the loop joint bar 48 provided in the PCa slab 18A and the loop joint bar 52 provided in the PCa slab 18B with a loop lap joint, the predetermined overlap length T1 of the loop joint bar 48 and the loop joint bar 52 can be shortened, and the length of the filling portion 58 can be shortened. This allows the amount of concrete 60 poured in the filling portion 58 to be reduced.

[0031] 7(a) and (b), in the slab-to-slab joint structure 22, by making the length L1 of the bottom plate portion 54 of the PCa slab 18A shorter than the length D1 of the loop joint bars 48, the PCa slab 18A can be dropped straight down from above so that the end face 84 of the bottom plate portion 54 of the PCa slab 18A butts against the end face 86 of the bottom plate portion 56 of the PCa slab 18B. In other words, the PCa slab 18A can be installed by moving it up and down.

[0032] (Column and slab joint structure) As shown in the side view of FIG. 8 and the plan view of FIG. 9, the column 14 and the PCa slab 18 are joined by a column-slab joint structure 24.

[0033] The slab joint structure 24 is composed of a loop joint bar 64 provided on the column 14 and extending from the side surface 62 of the column 14, a loop joint bar 68 provided on the PCa slab 18 and extending from the end surface 66 of the PCa slab 18, a filler portion 70 formed between the side surface 62 of the column 14 and the end surface 66 of the PCa slab 18, and concrete 72 poured into the filler portion 70 and hardened.

[0034] As shown in FIG. 9, the loop joint bars 64 and the loop joint bars 68 are arranged alternately in the beam width direction Y so as to overlap each other by a predetermined length T2.

[0035] In the column-slab joint structure 24, as shown in Fig. 9, the loop joint reinforcement 64 provided on the column 14 and the loop joint reinforcement 68 provided on the PCa slab 18 are connected by a loop lap joint, so that the force transmitted from the beam 16 to the PCa slab 18 can be reliably transmitted to the column 14. In addition, the predetermined overlap length T2 between the loop joint reinforcement 64 and the loop joint reinforcement 68 can be shortened, and the length of the filling portion 70 can be shortened. This allows the amount of concrete 72 poured in the filling portion 70 to be reduced.

[0036] (How to build a building) The building 10 is constructed according to the construction procedures shown in the elevation views of Figures 10(a) to (d). Here, the construction procedures will be described from the step of constructing a lower floor slab 74 by installing multiple PCa slabs 18 as shown in Figure 10(a) to the step of constructing an upper floor slab 76 by installing multiple PCa slabs 18 as shown in Figure 10(d).

[0037] First, as shown in FIG. 10(a), in the first step, a plurality of PCa slabs 18 are placed on a beam 16 (hereinafter referred to as "beam 16A") installed on a column 14 (hereinafter referred to as "column 14A"), and the PCa slabs 18 are supported by shoring 82. In this state, the PCa slabs 18 are joined to the beam 16A by a beam-to-slab joint structure 20 (see FIG. 3), the PCa slabs 18 are joined to each other by a slab-to-slab joint structure 22 (see FIG. 5), and the PCa slabs 18 are joined to the columns (joints 78 of the beams 16A) by a column-to-slab joint structure 24 (see FIG. 8). Then, the shoring 82 is removed, and the slab 74 of the lower floor is constructed.

[0038] Next, as shown in FIG. 10(b), in the second step, the pillar 14 (hereinafter referred to as "pillar 14B") is installed on the joint portion 78 of the beam 16A.

[0039] Next, as shown in FIG. 10(c), in the third step, a support 80 is installed on the PCa slab 18 that constitutes the slab 74 of the lower floor.

[0040] Next, as shown in FIG. 10(c), in the fourth step, a beam 16 (hereinafter referred to as "beam 16B") is placed on the column 14B and supported by supports 80. In this state, the joint portion 78 of the beam 16B is joined to the column 14B.

[0041] Next, as shown in Fig. 10(d), in the fifth step, after removing the shoring 80, a shoring 82 is installed on the PCa slab 18 constituting the lower floor slab 74. Note that the shoring 80 may be used as the shoring 82 without being removed.

[0042] Next, as shown in Fig. 10(d), in the sixth step, the PCa slab 18 is placed on the beam 16B and supported by supports 82. In this state, the PCa slab 18 is joined to the beam 16B by a beam-to-slab joint structure 20 (see Fig. 3), the PCa slabs 18 are joined to each other by a slab-to-slab joint structure 22 (see Fig. 5), and the PCa slab 18 is joined to the column (joint portion 78 of the beam 16B) by a column-to-slab joint structure 24 (see Fig. 8). As a result, a plurality of PCa slabs 18 are placed on the beam 16B to construct the slab 76 of the upper floor.

[0043] (effect) Next, the effects of this embodiment will be described.

[0044] According to the beam-slab joint structure 20 of this embodiment, as shown in Figures 2, 3 and 4(a), the concrete 30 that has entered the first through hole 40 of the angle iron 28 and hardened resists the force in the beam length direction X acting on the angle iron 28. As a result, the PCa slab 18 can be joined to the beam 16 so as to be rigid in the beam length direction X by the angle iron 28 as a shear force transmitting member, and a high degree of integration between the beam 16 and the PCa slab 18 can be achieved. As a result, the slab cross section of the PCa slab 18 can be taken into account in the rigidity evaluation of the beam 16, and further, the reinforcing bars of the PCa slab 18 can be taken into account in the strength evaluation of the beam 16.

[0045] Furthermore, the concrete 30 that has entered the first through hole 40 of the angle iron 28 and hardened resists the vertical force acting on the angle iron 28. This makes it possible to prevent the PCa slab 18 from lifting up.

[0046] Furthermore, the concrete 30 that has entered the second through hole 42 of the angle iron 28 and hardened resists the force in the beam width direction Y acting on the angle iron 28. As a result, the angle iron 28, as a shear force transmission member, can join the PCa slab 18 to the beam 16 so as to be rigid in the beam width direction Y, and a high degree of integration between the beam 16 and the PCa slab 18 can be achieved.

[0047] Furthermore, the concrete 30 that has entered the second through hole 42 of the angle iron 28 and hardened resists the vertical force acting on the angle iron 28. This makes it possible to prevent the PCa slab 18 from lifting up.

[0048] Furthermore, according to the beam-to-slab joint structure 20 of this embodiment, as shown in Figures 2 and 3, the PCa slab 18 is joined to the beam 16 by filling the hole 26 formed in the PCa slab 18 and into which the upper end of the angle iron 28 is inserted with concrete 30 as a filler, thereby reducing the concrete pouring work required to join the PCa slab 18 to the beam 16.

[0049] Furthermore, according to the beam-to-slab joint structure 20 of this embodiment, as shown in Figure 4(a), the shear force transmission member is an angle iron 28, and a first through hole 40 is formed on one side of this angle iron 28 and a second through hole 42 is formed on the other side of the angle iron 28, making it possible to easily form through holes in the beam width direction Y and the beam length direction X.

[0050] According to the beam-slab joint structure 20 of this embodiment, the slab is made of a PCa slab 18, which is a precast member, as shown in Fig. 3, so that the support work for supporting the slab can be reduced. Also, the amount of construction work such as reinforcing bars, formwork, and concrete work to be performed on-site can be reduced.

[0051] Furthermore, according to the beam-slab joint structure 20 of this embodiment, as shown in Fig. 10(c), by using PCa slabs 18, which are full precast members, as the slabs, after placing a plurality of PCa slabs 18 on the beams 16, the supports 80 supporting the beams 16B placed above the PCa slabs 18 can be installed early, and the beams 16B can be installed early. This makes it possible to shorten the construction period of the building 10 and reduce construction costs.

[0052] In addition, since the slab is a PCa slab 18 which is a full precast member and the installation of this PCa slab 18 can be performed early, work that was conventionally performed on the beam 16, such as grouting work for joining the joint portion 78 of the beam 16 to the column 14, can be performed on the PCa slab 18. In addition, a material storage area can be secured on the PCa slab 18, and the labor required for replacing the temporarily placed rebar can be reduced.

[0053] (Modification) Next, a modification of the above embodiment will be described.

[0054] In the above embodiment, as shown in FIG. 4(a), an example in which the shear force transmission member is an angle bar 28 is shown, but the shear force transmission member may be a member of other shapes such as a rod shape, a plate shape, a square tube shape, a cylinder shape, etc. The perspective view of FIG. 4(b) shows an example of a steel plate 88 as the shear force transmission member. The steel plate 88 is arranged so as to be L-shaped in a plan view. When the shear force transmission member is a steel plate 88, the steel plate 88 may be arranged so as to be L-shaped in a plan view as described above, or the steel plate 88 may be arranged so as to be cross-shaped or T-shaped in a plan view. The perspective view of FIG. 4(c) shows an example of a square steel pipe 90 as the shear force transmission member. Also, for example, the shear force transmission member may be a channel steel having a U-shaped cross section, and the first through hole 40 may be formed in one of the web or flange of this channel steel, and the second through hole 42 may be formed in the other of the web or flange.

[0055] In addition, in the above embodiment, as shown in Figure 2, an example was shown in which one angle iron 28 was placed as a shear force transmission member in the hole 26 formed in the PCa slab 18, but multiple shear force transmission members may be placed in one hole 26.

[0056] Furthermore, in the above embodiment, as shown in Fig. 3, an example was shown in which the holes 26 formed in the PCa slab 18 and into which the upper ends of the angle irons 28 were inserted were filled with concrete 30 as a filler, but the filler filled in the holes 26 may be other materials such as mortar. If the filler filled in the holes 26 is a material other than concrete, it is possible to eliminate the need for pouring concrete to join the PCa slab 18 to the beam 16.

[0057] In addition, in the above embodiment, as shown in Figure 3, an example was shown in which the slab is a fully precast concrete PCa slab 18, but the slab may also be a half precast concrete PCa slab 92, 94, as shown in the beam-to-slab joint structures 96, 98 shown in the front cross-sectional views of Figures 11 and 12.

[0058] As shown in Fig. 11, in the beam-slab joint structure 96, the thickness of a portion 100 of the PCa slab 92 located on the beam 16 is the same as that of the PCa slab 18, which is a full precast member and does not require pouring of post-cast concrete 102. Post-cast concrete 102 has been poured and hardened on the PCa slab 92 other than the portion 100.

[0059] Even in the beam-to-slab joint structure 96, the thickness of portion 100 is the same as that of the PCa slab 18, which is a fully precast component that does not require the pouring of post-cast concrete 102. Therefore, after the PCa slab 92 is placed on top of the beam 16, the support structure that supports the beam 16 placed above the PCa slab 92 can be installed on the PCa slab 92 at an early stage, thereby allowing the beam 16 placed above the PCa slab 92 to be installed at an early stage.

[0060] In addition, since the PCa slab 92 is joined to the beam 16 by filling the holes 26 formed in the PCa slab 92 and into which the upper ends of the angle irons 28 are inserted with concrete 30 as a filler, the concrete pouring work required to join the PCa slab 92 to the beam 16 can be reduced.

[0061] As shown in FIG. 12, in a beam-slab joint structure 98, post-cast concrete 102 is poured onto a PCa slab 94 and has hardened.

[0062] In the beam-to-slab joint structure 98, the PCa slab 94 is joined to the beam 16 by filling the holes 26 formed in the PCa slab 94 and into which the upper ends of the angle irons 28 are inserted with concrete 30 as a filler, so the amount of concrete poured to join the PCa slab 94 to the beam 16 is less than the amount of concrete poured in the filler portion on the beam formed between opposing half precast slabs to join a conventional half precast slab to a beam. In other words, the amount of concrete pouring work to join the PCa slab 94 to the beam 16 can be reduced.

[0063] Also, in the beam-to-slab joint structure 98, if a base frame such as a concrete block is placed on the PCa slab 94 and shoring is then installed on top of this, the work of installing the shoring can be carried out quickly.

[0064] Furthermore, in the above embodiment, as shown in FIG. 1, an example was shown in which the columns were precast reinforced concrete columns 14, but the columns may be of other structures such as SRC, steel frame, or cast-in-place reinforced concrete.

[0065] In the above embodiment, as shown in FIG. 1, an example is shown in which the beam is a fully precast reinforced concrete beam 16, but the beam may be a half precast reinforced concrete beam.

[0066] Furthermore, in the above embodiment, as shown in Figures 8 and 9, an example was shown in which the loop joint reinforcement 64 provided on the column 14 and the loop joint reinforcement 68 provided on the PCa slab 18 are connected by a loop lap joint to join the column 14 and the PCa slab 18. However, when the slab is a PCa slab 94 made of half precast reinforced concrete, it is sufficient to use a relay joint 106 to connect the reinforcing bar 108 provided on the column 14 and the reinforcing bar 110 provided in the post-cast concrete 102 poured on the PCa slab 94, as in the column-slab joint structure 104 shown in the side view of Figure 13.

[0067] In the column-slab joint structure 104, a relay joint 106 to which a reinforcing bar 108 provided on the column 14 is joined is embedded in the side surface 62 of the column 14, and a reinforcing bar 112 is screwed and attached to this relay joint 106. This reinforcing bar 112 and a reinforcing bar 110 provided in the post-cast concrete 102 poured on the PCa slab 94 are connected by a lap joint.

[0068] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modified examples may be used in appropriate combination, and it is of course possible to implement the present invention in various forms without departing from the gist of the present invention. [Explanation of symbols]

[0069] 16 Beam 18, 92, 94 PCa slab (slab) 20, 96, 98 Beam-to-slab joint structure 26 holes 28 Angle material (shear force transmission member) 30 Concrete (filler) 36 First side 38 Second side part 40 First through hole 42 Second through hole 88 Steel plate (shear force transmission member) 90 Square steel pipe (shear force transmission member) X Beam length direction Y beam width direction

Claims

1. Reinforced concrete beams and a precast reinforced concrete slab placed on the beam; a hole formed through the slab so as to be located on the beam; a shear force transmission member having a lower end embedded in the beam and an upper end exposed from the beam and inserted into the hole, the shear force transmission member having a first surface portion along the beam length direction of the beam, the first surface portion having a first through hole formed in the upper end and the lower end thereof, the first through hole penetrating in a lateral direction perpendicular to the beam length direction of the beam; a filler material filled in the hole into which the upper end of the shear force transmission member is inserted; A beam and slab joint structure having

2. The beam-slab joint structure described in claim 1, wherein the shear force transmission member has a second surface portion perpendicular to the first surface portion, and a second through hole penetrating the upper end portion in the beam length direction of the beam is formed in the second surface portion.

3. 3. A beam-slab joint structure as described in claim 2, wherein the shear force transmission member is an angle iron, the first through hole being formed on one side of the angle iron, and the second through hole being formed on the other side of the angle iron.

4. Reinforced concrete beams and a precast reinforced concrete slab placed on the beam; a hole formed through the slab so as to be located on the beam; a shear force transmission member having a lower end embedded in the beam and an upper end inserted into the hole, the shear force transmission member having a first surface along a beam length direction of the beam and a second surface perpendicular to the first surface, a first through hole penetrating the upper end in a lateral direction perpendicular to the beam length direction of the beam formed in the first surface, and a second through hole penetrating the upper end in the beam length direction of the beam formed in the second surface; a filler material filled in the hole into which the upper end of the shear force transmission member is inserted; having The shear force transmission member is an angle iron, and the first through hole is formed on one side of the angle iron, and the second through hole is formed on the other side of the angle iron.

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