Beam-floor joint structure and beam-floor joint method

Abstract

To provide a beam-floor joint structure and a beam-floor joint method using full precast concrete members, and capable of reusing the full precast concrete members after their dismantling.SOLUTION: A beam-floor joint structure 1 includes a beam member 5 made of full precast concrete, a floor member 6 made of full precast concrete joined to the beam member 5, an anchor structure 7 for fixing the floor member 6 to the beam member 5, and a nut 9 screwed into the anchor structure 7. The anchor structure 7 includes an embedded portion 15 embedded in the beam member 5, and a bolt portion 17 connected to the embedded portion 15 and having a thread formed on the outer circumferential surface of the upper end portion. The bolt portion 17 is inserted from below into a through hole 13 provided in the floor member 6, and the nut 9 screws into the bolt portion 17 and is engaged with an engaging surface 14 provided in the through hole 13.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a beam-floor joint structure and a beam-floor joint method using precast concrete members.

Background Art

[0002] As a method for joining a beam and a floor using precast concrete members, the half-precast method has become widespread. However, in the half-precast method, there is a lot of labor involved in steel bar placement work and concrete pouring work at the construction site. For this reason, a beam-floor joint structure and a joint method using full-precast concrete members have been proposed (for example, Patent Documents 1 to 3). In Patent Documents 1 to 3, a steel bar protruding from a full-precast concrete member, an angle member or a headed stud for transmitting shear force, etc. are embedded by cast-in-place concrete, so that a beam member, which is a full-precast concrete member, and a floor member are joined to each other.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] For sustainable development, the reuse of components is also required in the construction field. In the inventions described in Patent Documents 1 to 3, reinforcing bars, angle materials, headed studs, etc. protruding from full-precast concrete members are embedded by in-situ concrete. Therefore, in order to reuse the full-precast concrete member, it is necessary to destroy the part formed by in-situ concrete during demolition. However, at this time, there is a risk of damage to the reinforcing bars, angle materials, headed studs, etc. embedded in this part and the concrete part of the full-precast concrete member adjacent to this part. Therefore, it has been difficult to reuse full-precast concrete members.

[0005] In view of the above background, the present invention provides a beam-slab joint structure and a beam-slab joint method using a full-precast concrete member, and aims to provide a structure and a method that enable the reuse of the full-precast concrete member after its demolition.

Means for Solving the Problems

[0006] In order to solve the above problems, an aspect of the present invention is a beam-floor joint structure (1, 21, 31, 41, 51, 61, 71, 81, 91, 101), comprising a beam member (5, 62) made of full precast concrete, and a floor member (6, 63) made of full precast concrete joined to the beam member, the floor member including a through hole (13) extending in the vertical direction and having a locking surface (14) formed therein facing upward, an embedded portion (15, 24, 33, 43, 53, 73, 103) embedded in the beam member, and an anchor structure (7, 22, 32, 42, 52, 72, 102) including a bolt portion (17, 44, 105) connected to the embedded portion and protruding into the through hole from below, with a thread formed on the outer peripheral surface of the upper end portion, and a nut (8) screwed onto the bolt portion and locked to the locking surface. Here, the "full precast concrete member" means a precast concrete member excluding the precast concrete member used in the half-precast method from the precast concrete member. In other words, it refers to a precast concrete member for which steel bar placement work and concrete pouring work at the construction site are not scheduled to complete the member except for the connection portion with other members.

[0007] According to this aspect, by removing the nut from the bolt portion, the beam-floor joint structure can be disassembled, so that damage to the beam member and the floor member during disassembly is suppressed, and a beam-floor joint structure that can reuse the beam member and the floor member is provided.

[0008] In the above aspect, an elastic body (9) placed on the beam member (5, 62) and contacting the lower surface of the floor member (6, 63) on the upper surface and having a plate shape may be further provided.

[0009] According to this aspect, the elastic body absorbs construction errors and prevents rubbing of the floor member against the beam member during an earthquake.

[0010] In the above aspect, the beam member (5) includes, at an upper side edge, a shoulder surface (11) on which an end portion of the floor member is placed, and a wall surface (12) that extends upward from the shoulder surface and faces the end portion of the floor member (6). An elastic filler (10) filled between the wall surface and the end portion of the floor member may be further provided.

[0011] According to this aspect, the elastic filler absorbs the impact from the floor member to the beam member during an earthquake. Further, since the elastic filler is easier to remove than a filler of an inorganic material such as mortar, damage to the beam member and the floor member during demolition is suppressed.

[0012] In the above aspect, an elastic filler (20) filled in the through-hole (13) may be further provided.

[0013] According to this aspect, since the elastic filler is easier to remove than a filler of an inorganic material such as mortar, damage to the anchor structure and the floor member during demolition is suppressed.

[0014] In the above aspect, the anchor structure (22, 42, 52) may include a joint member that is connected to the embedded portion (24, 43, 53) and is arranged to open on the surface of the beam member (5) and connect the bolt portions (17, 44).

[0015] According to this aspect, by removing the portion protruding from the beam member in the anchor structure, the safety of the operator during transportation is enhanced, the space required when loading the beam member onto a transport vehicle is reduced, and damage during transportation of the protruding portion is prevented. Further, at the time of reuse, if the portion on the tip side of the anchor structure is damaged more than the joint member, it can be replaced.

[0016] In the above aspect, the anchor structure (102) includes an anchor support jig (104) connected to the embedded portion (103) and the bolt portion (105). The anchor support jig includes a first steel plate (106) that abuts against the side surface of the beam member (5) and is fixed to the embedded portion, and a second steel plate (107) that is fixed to the first steel plate, has a main surface facing the vertical direction, and to which the bolt portion is fixed.

[0017] Also with the anchor structure of this aspect, the floor member can be fixed to the beam member so that the shearing force is transmitted.

[0018] In the above aspect, the bolt portions (17, 44, 105) may be arranged outside the beam width direction rather than on the side surface in the beam width direction of the beam (5) member.

[0019] According to this aspect, since the bolt portions are arranged outside the beam width direction rather than on the side surface of the beam, even if the load of the floor member on the beam member is minimized, the floor member can be prevented from falling off the beam member. In addition, the length of the shoulder surface in the beam width direction can be shortened, and the arrangement of the reinforcing bars of the beam member can be made substantially the same as the arrangement of the reinforcing bars of the beam with a rectangular cross section, suppressing the complication of the shape and arrangement of the reinforcing bars.

[0020] In the above aspect, the bolt portions (17, 44) may project upward from the beam member (62).

[0021] According to this aspect, since the anchor structure is covered by the beam member and the floor member, rust prevention treatment and fireproof coating treatment for the anchor structure are not required.

[0022] In the above aspect, the beam member (62) may have a flat upper surface on which the floor members (6, 63) are placed.

[0023] According to this aspect, complication of the shape of the beam member is suppressed.

[0024] In the above aspect, the two floor members (6) may be arranged on the upper surface of the beam member (62) so as to face each other in the beam width direction, and an elastic filler (10) may be filled between the two beam members.

[0025] According to this aspect, the displacement of the floor member during an earthquake is absorbed by the elastic filler.

[0026] One aspect of the present invention is a beam-floor joint method, including steps of arranging a beam member (5, 62) made of full-precast concrete, and an anchor structure (7, 22, 32, 42, 52, 72, 102) including embedded parts (15, 24, 33, 43, 53, 73, 103) embedded in the beam member and bolt parts (17, 44, 105) having threads formed on the outer peripheral surface of the upper end exposed from the beam member; moving a floor member (6, 63) made of full-precast concrete including a through hole (13) extending in the vertical direction downward from above so that the bolt part penetrates into the through hole, and placing it on the beam member; and screwing a nut (8) onto the bolt part so as to be locked to a locking surface (14) provided in the through hole and facing upward.

[0027] According to this aspect, by removing the nut from the bolt part, the beam-floor joint structure can be disassembled, so that damage to the beam member and the floor member during disassembly is suppressed, and a beam-floor joint method that allows the beam member and the floor member to be reused is provided.

Advantages of the Invention

[0028] According to the above aspects, a beam-floor joint structure and a beam-floor joint method using full-precast concrete members, which can provide a structure and method that allow the full-precast concrete members to be reused after disassembly, are provided.

Brief Description of the Drawings

[0029]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0030] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0031] FIG. 1 shows a main part of a building 2 including a beam-floor joint structure 1 according to the first embodiment. The building 2 includes column members 3, column-beam joints 4, beam members 5, and floor members 6, and each of these members is a precast concrete member. A plurality of floor members 6 are arranged between a pair of beam members 5. Since the floor members 6 are arranged at a predetermined position by being moved downward from above, there are fewer restrictions on the construction order of the column members 3 and the beam members 5 compared to the case of moving them horizontally. The beam member 5 includes widened portions 5a that are widened more than the central portion at both ends in the extending direction, and by inserting, tensioning, and fixing a tension member (not shown) into the widened portions 5a, it is press-bonded to the column-beam joint 4.

[0032] FIG. 2 shows the beam member 5 and the floor member 6 in a cross-section orthogonal to the extending direction of the beam member 5 and parallel to the extending direction of the floor member 6, and FIG. 3 is an enlarged view of the left beam-floor joint structure 1 in FIG. 2. As shown in FIGS. 2 and 3, the beam-floor joint structure 1 includes a beam member 5, a floor member 6 joined to the beam member 5, an anchor structure 7 that connects the beam member 5 and the floor member 6 to each other, a nut 8 screwed onto the anchor structure 7, a plate-shaped elastic body 9 placed on the beam member 5 and having the floor member 6 placed on its upper surface, and an elastic filler 10 filled between the opposing surfaces of the beam member 5 and the floor member 6.

[0033] The beam member 5 is a full precast concrete member of reinforced concrete or prestressed concrete. The beam member 5 has a contour in a cross-section orthogonal to its extending direction such that both upper corners are cut off from a rectangle. That is, the beam member 5 includes a shoulder surface 11 on the upper side edge for placing the end of the floor member 6 and a wall surface 12 extending upward from the shoulder surface 11 and facing the end of the floor member 6. When only the floor member 6 is placed on one side of the upper side edge of the beam member 5, the shoulder surface 11 and the wall surface 12 do not have to be provided on the upper side edge of the side where the floor member 6 is not placed. The vertical length of the wall surface 12 is set so that the height of the upper surface of the floor member 6 coincides with the height of the upper surface of the beam member 5 when the floor member 6 is placed on the shoulder surface 11 via the elastic body 9.

[0034] The floor member 6 is a full-precast concrete member made of reinforced concrete or prestressed concrete. In the vicinity of the end in the extending direction of the floor member 6, there are provided through holes 13 that extend in the vertical direction and through which the ends of the anchor structures 7 are inserted. A plurality of through holes 13 are provided at a predetermined interval in the extending direction of the beam member 5 to which the end of the floor member 6 is joined. The through holes 13 are provided, for example, at an interval of 100 to 200 mm. The inner peripheral surface of the through hole 13 is preferably circular in plan view. Since the upper part of the through hole 13 has an enlarged diameter, a locking surface 14 is formed at the upper part inside the through hole 13, presenting an upward-facing annular shape for locking the nut 8.

[0035] The anchor structures 7 are each a part of the full-precast concrete member constituting the beam member 5, and a plurality of them are provided at a predetermined interval in the extending direction of the beam member 5. The interval between the anchor structures 7 is equal to the interval between the through holes 13. Each of the anchor structures 7 is constituted by a single steel bar. The anchor structure 7 includes an embedded part 15 embedded in the concrete of the beam member 5, an exposed part 16 exposed from the beam member 5 and the floor member 6, and a bolt part 17 that is connected to the embedded part 15 via the exposed part 16, penetrates into the through hole 13 from below, and has a thread formed on the outer peripheral surface of the upper end part. The anchor structure 7 has a function of fixing the floor member 6 to the beam member 5 and transmitting the shear force between the two members.

[0036] The embedded part 15 extends along the beam width direction of the beam member 5. When the floor members 6 are attached to both side edges of the beam member 5, the exposed parts 16 extend from both ends of the embedded part 15. When the floor member 6 is attached only to one side edge of the beam member 5, the exposed part 16 is provided only on the side where the floor member 6 is attached, and the end of the embedded part 15 on the opposite side becomes one end of the anchor structure 7 and exists in the concrete of the beam member 5. The exposed part 16 protrudes from the side surface of the beam member 5 and curves upward. The exposed parts 16 exposed from the beam member 5 and the floor member 6 are subjected to rust prevention treatment, fireproof coating treatment, etc. The length of the bolt part 17 is set so that the upper end of the bolt part 17 is positioned between the locking surface 14 and the upper surface of the beam member 5.

[0037] When constructing the interior of a building 2 (see FIG. 1) using an interior unit 18 (see FIG. 1) in which interior components such as unit baths, entrance doors, interior boards, pipes, and wiring are integrally formed in advance at a factory, the interior unit 18 may be fixed to an exposed portion 16 exposed from the beam member 5 and the floor member 6 by welding or the like.

[0038] The nut 8 is screwed onto the bolt portion 17 and is locked to the locking surface 14 via the washer 19. Thereby, the floor member 6 is joined to the beam member 5. The through hole 13 is filled with an elastic filler 20.

[0039] The elastic body 9 is made of an elastic material such as rubber and has a plate shape. The elastic body 9 is placed on the shoulder surface 11 of the beam member 5 and abuts against the lower surface of the end portion of the floor member 6 on the upper surface. The elastic body 9 may be fixed to the shoulder surface 11 of the beam member 5 and the lower surface of the floor member 6 by an adhesive or the like.

[0040] The elastic filler 10 is filled between the wall surface 12 of the beam member 5 facing each other and the end portion of the floor member 6. The elastic filler 10 may be the same type of material as the elastic filler 20 filled in the through hole 13 or a different type of material.

[0041] With reference to FIGS. 1 to 3, a construction method of the beam-floor joint structure 1 will be described.

[0042] First, a worker manufactures the beam member 5 and the floor member 6, which are full-precast concrete members, at a factory and transports the beam member 5 and the floor member 6 to the construction site.

[0043] Next, the worker uses a hoist to place the beam member 5 at a predetermined position in the building 2 and places the elastic body 9 on the shoulder surface 11 of the beam member 5. After the worker uses a hoist to lift the floor member 6, the worker moves the floor member 6 from above downward and places the floor member 6 on the elastic body 9. At this time, the bolt portion 17 of the anchor structure 7 is inserted into the through hole 13 from below.

[0044] The operator fits the washer 19 onto the bolt portion 17 and threads the nut 8 onto the bolt portion 17. By threading the nut 8 onto the bolt portion 17 so that the nut 8 is locked to the locking surface 14 of the through hole 13 via the washer 19, the floor member 6 is fixed to the beam member 5.

[0045] The operator fills the gap between the wall surface 12 of the beam member 5 and the end of the floor member 6 with the elastic filler 10 and fills the through hole 13 with the elastic filler 20.

[0046] The operation and effect of the beam-floor joint structure 1 will be described.

[0047] Since the floor member 6 is fixed to the beam member 5 by the anchor structure 7 including the bolt portion 17 and the nut 8, removing the nut 8 releases the fixing of the floor member 6 to the beam member 5. Therefore, damage to the beam member 5 and the floor member 6 is suppressed during disassembly, and the beam member 5 and the floor member 6 can be reused.

[0048] Since the exposed portion 16 of the anchor structure 7 and the bolt portion 17 protrude outward in the beam width direction from the side surface of the beam member 5, even if the load of the floor member 6 on the beam member 5 is minimized (for example, about 100 mm), the floor member 6 can be prevented from falling off the beam member 5. In addition, since the length of the shoulder surface 11 in the beam width direction is short, the arrangement of the reinforcing bars of the beam member 5 can be made substantially the same as the arrangement of the reinforcing bars of a beam with a rectangular cross section, and the complication of the shape and arrangement of the reinforcing bars is suppressed.

[0049] Since the gap between the wall surface 12 of the beam member 5 and the end of the floor member 6 and the through hole 13 are filled with the elastic fillers 10 and 20 which are easier to remove than the mortar filler, the elastic fillers 10 and 20 can be easily removed, and the beam-floor joint structure 1 can be disassembled without damaging the beam member 5, the floor member 6 and the anchor structure 7.

[0050] The elastic body 9 absorbs construction errors and prevents the floor member 6 from rubbing against the beam member 5 during an earthquake.

[0051] The elastic filler 10 filled in the gap between the wall surface 12 of the beam member 5 and the end of the floor member 6 absorbs the displacement and impact of the floor member 6 against the beam member 5 during an earthquake.

[0052] Referring to FIG. 4, the beam-floor joint structure 21 according to the second embodiment will be described. In the description, the components common to the described embodiments are omitted from the description and are given the same reference numerals, and the components that have a slight difference from the described embodiments but are substantially common are omitted from the description except for the slight difference and are given the same reference numerals (the same applies to the descriptions of the third embodiment and subsequent embodiments). The beam-floor joint structure 21 according to the second embodiment is different from the structure of the first embodiment in that the anchor structure 22 includes the joint member 23.

[0053] As shown in FIG. 4(A), the anchor structure 22 includes an embedded portion 24 embedded in the concrete of the beam member 5, an exposed portion 25 exposed from the beam member 5 and the floor member 6, a joint member 23 connecting the exposed portion 25 to the embedded portion 24, and a bolt portion 17 connected to the exposed portion 25. One end of a steel bar constitutes the bolt portion 17, and the remaining portion constitutes the exposed portion 25. The joint member 23 is a threaded joint, and threads are formed on the outer peripheral surface of the end portion of the joint member 23 connected to the embedded portion 24 and the exposed portion 25. The embedded portion 24 and the joint member 23 are part of the full-precast concrete member constituting the beam member 5, and the full-precast concrete member is manufactured with the joint member 23 attached to the embedded portion 24. The joint member 23 is arranged such that the insertion opening of the exposed portion 25 opens to the side surface of the beam member 5. The exposed portion 25 exposed from the beam member 5 and the floor member 6 is subjected to rust prevention treatment and fireproof coating treatment in the same manner as in the first embodiment.

[0054] Referring to FIGS. 4(A) to 4(C), a disassembly method of the beam-floor joint structure 21 will be described. First, the operator removes the elastic fillers 10 and 20 from the beam-floor joint structure 21 shown in FIG. 4(A). Next, the operator releases the fixing of the floor member 6 to the beam member 5 by removing the nut 8 from the bolt portion 17. The operator uses a hoist to lift the floor member 6 and remove it from the beam member 5 (FIG. 4(B)). The operator rotates the exposed portion 25 and the bolt portion 17 about the beam width direction as the axis to remove the exposed portion 25 from the joint member 23 (FIG. 4(C)). The operator uses a hoist to remove the beam member 5.

[0055] Due to the joint member 23, the attachment and detachment of the exposed portion 25 and the bolt portion 17 to and from the embedded portion 15 can be performed at the construction site. Therefore, during transportation, by removing the exposed portion 25 and the bolt portion 17 from the beam member 5, the beam member 5 can be transported without members protruding from the beam member 5, improving the safety for the operator. Also, when the exposed portion 25 and the bolt portion 17 protrude, the space required to stack the beam member 5 on a transport vehicle such as a truck becomes wider by the protruding amount, but if these are removed, such space is not required. Further, if the exposed portion 25 or the bolt portion 17 is bent or cut during transportation or the like, that portion cannot be used and it is desirable to remove it. In the case where there is no joint member 23, it is necessary to cut the portion protruding from the concrete of the beam member 5 and then perform processes such as embedding a construction anchor. Without the joint member 23, such unnecessary construction increases, and it is necessary to align the bolt portion 17 with the position of the through hole 13 of the floor member 6, requiring relatively high-precision management at the construction site. On the other hand, when there is the joint member 23, even if the exposed portion 25 and the bolt portion 17 are damaged, the replacement of the exposed portion 25 and the bolt portion 17 is easy, and since the joint member 23 is arranged in the beam member 5 which is a precast concrete member at the factory, precision management is also easy.

[0056] Also, during storage, by removing the exposed portion 25 and the bolt portion 17 from the beam member 5 and covering the joint member 23 that opens to the side surface of the beam member 5, rusting of the anchor structure 22 can be prevented. The exposed portion 25 and the bolt portion 17 can be reused by performing rust prevention treatment and / or storing them in an environment where rusting is less likely to occur.

[0057] Even if the exposed portion 25 or the bolt portion 17 is damaged during disassembly, the beam member 5 can be reused by replacing the exposed portion 25 and the bolt portion 17. Also, it is conceivable that the exposed portion 25 and / or the bolt portion 17 have yielded or been damaged due to an earthquake or long-term load. Therefore, when disassembling and reusing the beam member 5 and the floor member 6, it is preferable to replace the exposed portion 25 and the bolt portion 17. The presence of the joint member 23 enables such replacement.

[0058] Referring to FIG. 5, the beam-floor joint structure 31 according to the third embodiment will be described. The main difference of the third embodiment from the first embodiment is that the anchor structure 32 has no portion (exposed portion 16 (see FIG. 3)) exposed from the beam member 5 and the floor member 6.

[0059] Each of the anchor structures 32 is composed of a single steel bar. The anchor structure 32 includes an embedded portion 33 embedded in the concrete of the beam member 5 and a bolt portion 17 directly connected to the embedded portion 33. The entire anchor structure 32 is a part of the full-precast concrete member constituting the beam member 5, and a plurality of them are provided at predetermined intervals in the extending direction of the beam member 5.

[0060] The middle part of the embedded portion 33 extends along the width direction of the beam member 5. When the floor members 6 are attached to both side edges of the beam member 5, both end portions of the embedded portion 33 are curved upward. When the floor member 6 is attached only to one side edge of the beam member 5, the end portion of the embedded portion 33 on the side where the floor member 6 is attached is curved upward, and the end portion of the embedded portion 33 on the opposite side serves as one end portion of the anchor structure 32 and exists in the concrete of the beam member 5. The bolt portion 17 directly connected to the embedded portion 33 extends upward from the shoulder surface 11 of the beam member 5.

[0061] The shoulder surface 11 from which the bolt portion 17 protrudes is longer in the beam width direction than the shoulder surface 11 of the first embodiment. The elastic body 9 placed on the shoulder surface 11 is provided with a through hole 9a through which the bolt portion 17 is inserted. In the floor member 6, compared with the first embodiment, the through hole 13 is provided at a position closer to the end face of the floor member 6, and the length in the beam width direction of the portion locked to the shoulder surface 11 is longer.

[0062] Since the embedded portion 33 is curved within the beam member 5 and the bolt portion 17 protrudes upward from the shoulder surface 11, the entire anchor structure 32 is covered by the beam member 5 and the floor member 6, so that rust prevention treatment and fireproof coating for the anchor structure 32 are not required.

[0063] Referring to FIG. 6, the beam-floor joint structure 41 according to the fourth embodiment will be described. The beam-floor joint structure 41 according to the fourth embodiment is different from the structure of the third embodiment in that the anchor structure 42 includes the joint member 23.

[0064] As shown in Fig. 6(A), the anchor structure 42 includes an embedded portion 43 embedded in the concrete of the beam member 5, a joint member 23, and a bolt portion 44 joined to the embedded portion 43 by the joint member 23. The joint member 23 is a threaded joint, and threads are formed on the outer peripheral surfaces of the ends of the embedded portion 24 and the bolt portion 44 that are connected to the joint member 23. The embedded portion 43 and the joint member 23 are part of the full-precast concrete member that constitutes the beam member 5, and the full-precast concrete member is manufactured with the joint member 23 attached to the embedded portion 43. The joint member 23 is arranged such that the insertion opening of the bolt portion 44 opens to the shoulder surface 11 of the beam member 5.

[0065] Figs. 6(A) to (C) illustrate the disassembly method of the beam-floor joint structure 41. The disassembly method of the beam-floor joint structure 41 is substantially the same as the disassembly method of the second embodiment, and is performed by removing the elastic fillers 10 and 20, removing the nut 8 from the bolt portion 44, removing the floor member 6, removing the bolt portion 44 from the joint member 23 by rotating the bolt portion 44 about its vertical axis, and removing the beam member 5.

[0066] The beam-floor joint structure 41 according to the fourth embodiment has the same effects as those of the joint member 23 in the second embodiment due to the presence of the joint member 23.

[0067] Referring to Fig. 7, the beam-floor joint structure 51 according to the fifth embodiment will be described. The fifth embodiment is different from the fourth embodiment in the shape of the anchor structure 52. The anchor structure 52 extends in the vertical direction and includes an embedded portion 53 embedded in the concrete of the beam member 5, a joint member 23, and a bolt portion 44 joined to the embedded portion 53 by the joint member 23. The anchor structure 52 is provided for each side edge where the floor member 6 is joined. The beam-floor joint structure 51 according to the fifth embodiment has the same effects as the beam-floor joint structure 41 according to the fourth embodiment.

[0068] Referring to FIG. 8, the beam-floor joint structure 61 according to the sixth embodiment will be described. The beam-floor joint structure 61 according to the sixth embodiment includes a beam member 62, a floor member 63 supported on the upper surface of the beam member 62 at an intermediate portion thereof, an anchor structure 32 that connects the beam member 62 and the floor member 63 to each other, a nut 8 screwed onto the anchor structure 32, and a plate-shaped elastic body 9 placed on the beam member 62 and having the floor member 63 placed on its upper surface.

[0069] The beam member 62 is a full precast concrete member made of reinforced concrete or prestressed concrete. The beam member 62 has a rectangular contour in a cross section orthogonal to its extending direction. The floor member 63 is a full precast concrete member made of reinforced concrete or prestressed concrete. The floor member 63 is provided with a through hole 13 that extends in the vertical direction and through which the bolt portion 17 of the anchor structure 32 is inserted at an intermediate portion in its extending direction. The anchor structure 32 is arranged such that the bolt portion 17 protrudes from the upper surface of the beam member 62, and the whole of it is a part of the full precast concrete member constituting the beam member 62. The elastic body 9 is placed on the upper surface of the beam member 62, and the intermediate portion of the floor member 63 is placed thereon. On the outer wall side of the building 2 (see FIG. 1), the end portion of the floor member 63 may be placed on the upper surface of the beam member 62.

[0070] Thus, even in a structure where the floor member 63 is placed on the upper surface of the beam member 62, similar to the above-described embodiments, the beam member 62 and the floor member 63 are not damaged during disassembly, the beam member 62 and the floor member 63 are reusable, due to the easy removability of the elastic filling material 20, the beam member 62 and the floor member 63 are less likely to be damaged during disassembly, the construction error by the elastic body 9 is absorbed, and rubbing of the floor member 63 against the beam member 62 during an earthquake is prevented, and the like effects are achieved.

[0071] Referring to FIG. 9, the beam-floor joint structure 71 according to the seventh embodiment will be described. The beam-floor joint structure 71 according to the seventh embodiment is different from the sixth embodiment in the shape of the anchor structure 72.

[0072] Each of the anchor structures 72 is composed of a single steel bar and is part of the precast concrete member that constitutes the beam member 62. The anchor structure 72 extends in the vertical direction and includes an embedded portion 73 embedded in the concrete of the beam member 62 and a bolt portion 17 connected to the embedded portion 73. The beam-slab joint structure 71 according to the seventh embodiment has the same effects as those of the sixth embodiment.

[0073] Referring to FIG. 10(A), the beam-slab joint structure 81 according to the eighth embodiment will be described. The beam-slab joint structure 81 according to the eighth embodiment is different from the sixth embodiment in that the ends of the two floor members 6 are placed on the upper surface of the beam member 62 so as to face each other in the beam width direction. An elastic filler 10 is filled between the ends of the two floor members 6. The beam-slab joint structure 81 according to the eighth embodiment has the same effects as those of the sixth embodiment. Further, the elastic filler 10 absorbs the difference in displacement between the floor members 6 during an earthquake.

[0074] Referring to FIG. 10(B), the beam-slab joint structure 91 according to the ninth embodiment will be described. The beam-slab joint structure 91 according to the ninth embodiment is different from the ninth embodiment in that mortar 92 is arranged between the beam member 62 and the floor member 6 instead of the elastic body 9 (see FIG. 10(A)). The beam-slab joint structure 91 according to the ninth embodiment suppresses the relative displacement of the floor member 6 with respect to the beam member 62 by using mortar 92 instead of the elastic body 9, but has the same effects as those of the eighth embodiment in other respects.

[0075] Referring to FIG. 11, the beam-slab joint structure 101 according to the tenth embodiment will be described. The beam-slab joint structure 101 according to the tenth embodiment is different from the first embodiment in the structure of the anchor structure 102.

[0076] The anchor structure 102 includes an embedded portion 103 whose tip protrudes from the side surface of the beam member 5 and the remaining portion of which is embedded in the concrete of the beam member 5, an anchor support jig 104 that abuts against the side surface of the beam member 5 and is connected to the embedded portion 103, and a bolt portion 105 that is connected to the anchor support jig 104, the upper part of which penetrates into the through hole 13 from below and has a thread formed on the outer peripheral surface.

[0077] The embedding part 103 is preferably an embedded anchor, but may also be a post-construction anchor.

[0078] The anchor support jig 104 includes a first steel plate 106 that abuts against the side surface of the beam member 5 and is fixed to the embedding part 103, two second steel plates 107 that are fixed to the upper and lower end portions of the first steel plate 106 by welding or the like and have main surfaces facing in the vertical direction, and two third steel plates 108 that are fixed to the first steel plate 106 by welding or the like at one side edge and are fixed to the second steel plates 107 by welding or the like at the upper and lower edges, have main surfaces facing in the extending direction of the beam member 5, and are arranged at a predetermined interval from each other in the extending direction of the beam member 5. The first steel plate 106 is provided with a through hole 112 for inserting a protruding portion from the side surface of the beam member 5 in the embedding part 103. The first steel plate 106 is fixed to the embedding part 103 by inserting the protruding portion of the embedding part 103 through the through hole 112 and screwing a nut 109 onto a thread provided on the outer periphery of the protruding portion.

[0079] The bolt part 105 is constituted by, for example, a fully threaded anchor. Through holes 110 for inserting the bolt part 105 are formed in the two second steel plates 107, and the bolt part 105 is arranged so as to pass between the through holes 110 and the two third steel plates 108. The bolt part 105 is fixed to the anchor support jig 104 by a nut 111 that is screwed onto the bolt part 105 and abuts against the upper surface of the upper second steel plate 107 and the lower surface of the lower second steel plate 107.

[0080] The beam-slab joint structure 101 according to the tenth embodiment has the same operational effects as the second embodiment. Further, when it becomes necessary to increase the number of anchor structures 102 during reuse, the number of anchor structures 102 can be increased by configuring the embedding part 103 as a post-construction anchor.

[0081] With the above description of the specific embodiments completed, the present invention is not limited to the above embodiments and variations, and can be widely modified and implemented. The embedded portion of the anchor structure may not be a part of the full precast concrete member constituting the beam member, but may be a post-construction anchor provided after the beam member is manufactured and improved. Among the anchor structures of the first, second, and tenth embodiments, two or more types of anchor structures may be used in combination. Among the anchor structures of the third to fifth embodiments, two or more types of anchor structures may be used in combination. The anchor structures of the sixth and seventh embodiments may be used in combination. In the eighth and ninth embodiments, some of the anchor structures may be replaced with the anchor structure of the seventh embodiment. The joint member of the second embodiment may be provided to the anchor structures of the sixth to tenth embodiments.

Explanation of Reference Numerals

[0082] 1, 21, 31, 41, 51, 61, 71, 81, 91, 101: Beam-slab joint structure 5, 62: Beam member 6, 63: Slab member 7, 22, 32, 42, 52, 72, 102: Anchor structure 8: Nut 9: Elastic body 10: Elastic filling material 11: Shoulder surface 12: Wall surface 13: Through hole 14: Locking surface 15, 24, 33, 43, 53, 73, 103: Embedded portion 17, 44, 105: Bolt portion 20: Elastic filling material 104: Anchor support jig 106: First steel plate 107: Second steel plate

Claims

1. A beam - floor joint structure, comprising a beam member made of full - precast concrete, a floor member made of full - precast concrete joined to the beam member, the floor member including a through - hole extending in the vertical direction and having a locking surface formed therein facing upward, and the floor member; an anchor structure including an embedded part embedded in the beam member and a bolt part connected to the embedded part and protruding into the through - hole from below, with a thread formed on the outer peripheral surface of the upper end; a nut screwed onto the bolt part and locked to the locking surface; and the beam - floor joint structure is provided with these components.

2. The beam - floor joint structure according to claim 1, further comprising an elastic body placed on the beam member and in contact with the lower surface of the floor member on the upper surface and having a plate shape.

3. The beam member includes, at the upper side edge, a shoulder surface for placing the end of the floor member and a wall surface extending upward from the shoulder surface and facing the end of the floor member, and the beam - floor joint structure according to claim 1, further comprising an elastic filling material filled between the wall surface and the end of the floor member.

4. The beam - floor joint structure according to claim 1, further comprising an elastic filling material filled in the through - hole.

5. The beam - floor joint structure according to claim 1, wherein the anchor structure includes a joint member connected to the embedded part and arranged to open on the surface of the beam member and continue the bolt part.

6. The anchor structure includes an anchor support jig connected to the embedded part and the bolt part, and the anchor support jig includes a first steel plate contacting the side surface of the beam member and fixed to the embedded part, and a second steel plate fixed to the first steel plate and having a main surface facing in the vertical direction, to which the bolt part is fixed. The beam - floor joint structure according to claim 1.

7. The bolt portion is disposed outward in the beam width direction from a side surface in the beam width direction of the beam member, the beam-floor joint structure according to claim 1.

8. The bolt portion projects upward from the beam member, the beam-floor joint structure according to claim 1.

9. The beam member has a flat upper surface on which the floor member is placed, the beam-floor joint structure according to claim 1.

10. Two of the floor members are arranged to face each other in the beam width direction on the upper surface of the beam member, and an elastic filler is filled between the two beam members, the beam-floor joint structure according to claim 9.

11. A step of arranging a beam member made of full precast concrete and an anchor structure including an embedded portion embedded in the beam member and a bolt portion having a thread formed on an outer peripheral surface of an upper end portion exposed from the beam member; A step of moving a floor member made of full precast concrete including a through hole extending in the vertical direction downward from above so that the bolt portion penetrates into the through hole, and placing it on the beam member; A step of screwing a nut onto the bolt portion so as to be locked to a locking surface provided in the through hole and facing upward; A beam-floor joining method comprising:

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