Plumbing support

Abstract

To provide a plumbing support capable of improving a load bearing capacity when a compressive load is applied.SOLUTION: A plumbing support 10 has screw rods 34, 44 having hooks 35, 45 at outer ends, which are screwed to inner fitting nuts 31, 41 fixed to an outer pipe 22 and an inner pipe 24 so as to freely advance and retreat, and are attached to attached parts of a concrete floor board and the concrete wall board. The inner fitting nuts 31, 41 have flanges 31b and 41b which are in surface contact with an end surface of a support pipe 20 and transmit a compression load applied to the support pipe 20 to the end surface of the support pipe 20.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a building support used at a construction site.

Background Art

[0002] At a construction site, in order to accurately install a PC board (precast concrete board), formwork, etc. at a predetermined position in the vertical and horizontal directions, a building support is used between the floor and the PC board.

[0003] A building support is known from Patent Document 1. In the building support of Patent Document 1, a threaded rod having an annular body that engages with a hook fixed to a concrete floor slab is screwed into the lower end of a support pipe. At the upper end of the support pipe, a wall mounting fitting for attaching to a concrete wall panel is provided, and a threaded rod having a reverse thread relationship with the threaded rod is screwed in.

[0004] By rotating the support pipe in the clockwise or counterclockwise direction in the axial direction, the pair of threaded rods described above can advance and retreat with respect to the support pipe, and the overall length can be adjusted in a telescopic manner.

[0005] In Patent Document 1, a pair of threaded rods are directly screwed into the support pipe. This configuration requires threading female threads on the long support pipe itself. By the way, threading female threads is easier to manufacture for a member having a shorter length than a long member.

[0006] In order to take advantage of this, as shown in FIGS. 11 and 12, a building support 100 has been proposed in which an internal fitting nut 130 into which a threaded rod 120 is screwed in the axial direction is internally fitted to both the upper and lower ends of a support pipe 110. FIGS. 11 and 12 typically illustrate the internal fitting nut 130 and the threaded rod 120 on the upper end side of the support pipe 110. The threaded rods 120 provided at both the upper and lower ends of the support pipe 110 have a reverse thread relationship.

[0007] The built-in nut 130 is configured such that a plurality of screw members 140 are respectively screwed in radially through a plurality of through holes 112 provided on the outer periphery of the support pipe 110, thereby preventing rotation of the built-in nut 130 relative to the support pipe 110 in the axial direction and the circumferential direction.

[0008] The outer end of the screw rod 120 on the upper end side of the support pipe 110 has, for example, a hook 150 that hooks onto a wall mounting fitting Aa attached to the concrete wall panel A. Although not shown, the outer end of the screw rod on the lower end side of the support pipe 110 is provided with, for example, a hook similar to the hook 150, and the hook is engaged with an anchor or the like fixed to the concrete floor slab.

[0009] In the built-in support shown in FIGS. 11 and 12, with the support pipe attached to the concrete wall panel and the concrete floor slab as described above, by rotating the support pipe in the clockwise or counterclockwise direction in the axial direction, the pair of screw rods advance and retreat relative to the support pipe. As a result, the overall length of the built-in support is adjusted for expansion and contraction. In FIG. 11, for the sake of convenience of explanation, although not shown, a hook locking body similar to that of the first embodiment described later is attached to the screw rod 120.

Prior Art Documents

Patent Documents

[0010]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0011] Conventionally, when a load is applied to the built-in support in the compression direction, the compression load on the support pipe 110 is configured to be received by the screw members 140 via the screw rod 120 and the built-in nut 130.

[0012] However, when a compressive load is applied to the screw member, it is not preferable because the screw member 140 may be sheared by the shear load acting on the contact portion at the extremely narrow portion between the screw member 140 and the through hole 112.

[0013] Also, in the market, an improvement in the load-bearing capacity when a load is applied in the compression direction to the entire length of the built-in support is desired. When attempting to improve the load-bearing capacity, in the configuration where the compressive load is received by the screw member described above, it is conceivable to increase the number of screw members or increase the diameter of the screw member.

[0014] However, there are limits to increasing the number of screws or increasing the diameter of the screw member. An object of the present invention is to solve the above problems and provide a built-in support capable of improving the load-bearing capacity when a compressive load is applied.

Means for Solving the Problems

[0015] In order to solve the above problems, the built-in support of the present invention has, at the lower end of the support tube, a first attachment portion attached to the first structure, and at the upper end of the support tube, a second attachment portion attached to a second structure arranged perpendicular to the first structure. The built-in support is such that at least one of the first attachment portion and the second attachment portion includes an internal nut fitted inside the end of the support tube, a fastening member that penetrates radially with respect to the outer peripheral surface of the end of the support tube and is screwed to the internal nut to prevent the internal nut from rotating with respect to the support tube and receive the tensile load applied to the support tube, and a screw rod that is screwed to the internal nut so as to be able to advance and retreat and has a hook at its outer end for attaching to the attached portion of the first structure or the second structure. A compression load transmission member that is in surface contact with the end face of the support tube and receives the compression load applied to the support tube is screwed to the screw rod.

[0016] With the above configuration, when a compressive load is applied through the threaded rod of the built-in support, this compressive load is applied to the end face of the support pipe that abuts against the compressive load transmission member. As a result, the load-bearing capacity of the built-in support when a compressive load is applied through the threaded rod of the built-in support can be improved.

[0017] Further, the compressive load transmission member may be a flange formed on the outer periphery of the internal nut. Further, the flange may have a cylindrical portion that engages with a male thread threaded on the outer periphery of the support pipe.

[0018] Further, the flange may have a caulked portion caulked to the outer periphery of the support pipe. Further, the compressive load transmission member may be a fixing nut that is disposed in contact with the outer end of the internal nut and prevents loosening of the internal nut with respect to the threaded rod.

[0019] Further, the first attachment portion and the second attachment portion each have the internal nut, the fastening member, and the threaded rod, and the threaded rod of the first attachment portion and the threaded rod of the second attachment portion may be screwed into the internal nut of the first attachment portion and the internal nut of the second attachment portion so as to be movable forward and backward in a reverse thread relationship.

[0020] With the above configuration, the compressive load applied to the built-in support is applied to both end faces of the support pipe that abut against the compressive load transmission members of the first attachment portion and the second attachment portion. As a result, the load-bearing capacity of the built-in support can be improved.

[0021] Further, the support pipe preferably includes an outer pipe and an inner pipe that is inserted into the outer pipe so as to be position-adjustable in the axial direction. With the above configuration, even in a built-in support having a support pipe in which the position of the inner pipe with respect to the outer pipe is adjusted, the load-bearing capacity of the built-in support when a compressive load is applied through the threaded rod of the built-in support can be improved.

Effects of the Invention

[0022] According to the present invention, it has the effect of being able to improve the load-bearing capacity when a compressive load is applied.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Modes for Carrying Out the Invention

[0024] <First Embodiment> Hereinafter, the built-in support 10 of the first embodiment embodying the present invention will be described with reference to FIGS. 1 to 5.

[0025] As shown in FIGS. 1 and 2, the built-in support 10 has a support pipe 20, a first attachment portion 30, and a second attachment portion 40. (Support pipe 20) The support pipe 20 is composed of an outer pipe 22 and an inner pipe 24 that is slidably inserted into the outer pipe 22. That is, the lower end side of the inner pipe 24 is slidably inserted into the upper end side of the outer pipe 22 in the axial direction. A plurality of through holes 22a are formed along the axial direction at predetermined intervals on both side surfaces of the upper part of the outer pipe 22 that are 180° opposite to each other. A plurality of through holes 24a are formed along the axial direction at predetermined intervals on both side surfaces of the lower part of the inner pipe 24 that are 180° opposite to each other.

[0026] Combinations in which a pair of through holes 22a and a pair of through holes 24a respectively coincide are provided at a plurality of locations in the axial direction. Then, as shown in FIG. 1, the insertion ends 25a, 25b of the substantially channel-shaped handle 25 are inserted into and removed from the coinciding pair of through holes 22a and a pair of through holes 24a in a freely detachable manner. A retaining pin 26 is rotatably connected to the tip of this insertion end 25a.

[0027] The retaining pin 26 is arranged so as to face the same direction as the direction in which the insertion end 25a of the handle 25 points when the insertion end 25a of the handle 25 is inserted through the through holes 22a and 24a. And after the insertion end 25a is inserted through the through holes 22a and 24a, the retaining pin 26 is operated in a direction intersecting the direction in which the insertion end 25a points as shown in FIG. 1, thereby preventing the handle 25 from detaching from the inner pipe 24 and the inner pipe 24.

[0028] As described above, when the insertion end 25a of the handle 25 is inserted through the through holes 22a and 24a, the inner pipe 24 is fixed to the outer pipe 22. Also, when the insertion end 25a of the handle 25 is inserted through the mutually different through holes 22a and 24a, the inner pipe 24 can be adjusted in position in the axial direction with respect to the outer pipe 22.

[0029] (First attachment portion 30) As shown in FIGS. 1 and 2, the first attachment portion 30 is disposed at the upper end portion of the outer tube 22. As shown in FIG. 2, the first attachment portion 30 has an internally threaded nut 31, a nut 33, and a threaded rod 34. The internally threaded nut 31 has a female thread 31a in the axial direction and thus has a cylindrical shape, and is fitted into the lower end portion of the outer tube 22. In the present embodiment, the female thread 31a is a right-handed thread. The outer peripheral surface of the upper end portion of the outer tube 22 has a plurality of through holes 22b drilled from four directions respectively.

[0030] The internally threaded nut 31 is fixed to the outer tube 22 by screwing a fixing bolt 32 inserted into each through hole 22b into a female threaded hole 31c formed on the circumferential surface of the internally threaded nut 31. That is, the fixing bolt 32 penetrates radially with respect to the outer peripheral surface of the end portion of the support tube 20 (outer tube 22) and is screwed into the internally threaded nut 31.

[0031] A flange 31b is formed at the outer end of the internally threaded nut 31. In the present embodiment, the flange 31b is provided over the entire circumferential direction of the internally threaded nut 31. The flange 31b is in a state of being in surface contact with the lower end surface (i.e., the end surface) of the outer tube 22 when the internally threaded nut 31 is fixed to the outer tube 22.

[0032] When a compressive load is applied upward to the internally threaded nut 31, the compressive load is configured to be received by the lower end surface of the outer tube 22. And the through hole 22b has a size such that the inner peripheral surface of the through hole 22b does not contact the outer peripheral surface of the fixing bolt 32 when the compressive load is applied to the internally threaded nut 31. The flange 31b corresponds to a compressive load transmission member.

[0033] When a tensile load is applied downward to the internally threaded nut 31, the fixing bolt 32 is configured to receive the tensile load. The fixing bolt 32 thus serves to prevent the internally threaded nut 31 from rotating with respect to the support tube 20 and to receive the tensile load applied to the support tube 20. The fixing bolt 32 corresponds to a fastening member.

[0034] The threaded rod 34 is screwed into the female thread 31a of the internally embedded nut 31. When the threaded rod 34 is in a non-rotatable state around its axis, if the support tube 20 rotates in the R direction in FIGS. 1 and 2, the screwing amount into the internally embedded nut 31 increases, causing the threaded rod 34 to move in the S direction. Also, when rotating in the reverse R direction in FIGS. 1 and 2, the screwing amount of the threaded rod 34 into the internally embedded nut 31 decreases, and the threaded rod 34 relatively moves in the reverse S direction. Thus, the threaded rod 34 is screwed into the internally embedded nut 31 so as to be able to advance and retreat freely.

[0035] Also, the axial position adjustment of the threaded rod 34 with respect to the support tube 20 is performed by rotating the support tube 20 around its axis in the R direction or the reverse R direction. The inner end of the threaded rod 34 is arranged to protrude inward from the female thread forming portion of the internally embedded nut 31, and the retaining pin 36 is attached through it in the radial direction.

[0036] A hook 35 is integrally provided at the outer end of the threaded rod 34. A nut 33 having a female thread 33a is screwed onto the threaded rod 34. A pair of handles 33b protrude and are fixed to opposite 180° positions on the outer peripheral surface of the nut 33.

[0037] When the above-mentioned position adjustment of the threaded rod 34 with respect to the support tube 20 is performed, the nut 33 is arranged at a position separated from the outer end surface of the internally embedded nut 31. Then, after the above-mentioned position adjustment of the threaded rod 34 with respect to the support tube 20 is completed, it is screwed in so as to closely contact the outer end surface of the internally embedded nut 31. Thereby, the nut 33 exhibits a double-nut effect of preventing loosening of the internally embedded nut 31 with respect to the threaded rod 34.

[0038] Also, a hook lock body 37 is arranged on the threaded rod 34. The hook lock body 37 includes a nut portion 38 screwed onto the threaded rod 34 and a cylindrical lock portion 39 integrally connected to the nut portion 38. Handles 38a protrude and are fixed to opposite 180° positions on the outer peripheral surface of the nut portion 38.

[0039] The locking portion 39 is movable between a locking position (see FIG. 5) that covers the hook 35 and an unlocking position that releases the periphery of the hook 35 by rotating the nut portion 38 with respect to the screw rod 34.

[0040] (Second mounting portion 40) As shown in FIGS. 1 and 2, the second mounting portion 40 is disposed at the upper end portion of the inner tube 24. As shown in FIGS. 2 and 4, the second mounting portion 40 includes an internally threaded nut 41, a nut 43, and a screw rod 44. The internally threaded nut 41 has a female screw 41a in the axial direction and is cylindrical, and is fitted into the upper end portion of the inner tube 24. In the present embodiment, the female screw 41a is a left-handed screw. The outer peripheral surface of the upper end portion of the inner tube 24 has a plurality of through holes 24b drilled from four directions.

[0041] The internally threaded nut 41 is fixed to the inner tube 24 by screwing the fixing bolts 42 inserted into the respective through holes 24b into female screw holes 41c formed on the peripheral surface of the internally threaded nut 41. That is, the fixing bolts 42 penetrate in the radial direction with respect to the outer peripheral surface of the end portion of the support tube 20 (inner tube 24) and are screwed into the internally threaded nut 41.

[0042] A flange 41b is formed at the outer end of the internally threaded nut 41. In the present embodiment, the flange 41b is provided over the entire circumferential direction of the internally threaded nut 41. The flange 41b is in surface contact with the upper end surface (i.e., the end surface) of the inner tube 24 when the internally threaded nut 41 is fixed to the inner tube 24.

[0043] When a compressive load is applied downward to the internally threaded nut 41, the compressive load is received by the upper end surface of the inner tube 24. And the through holes 24b have a size such that the inner peripheral surface of the through holes 24b does not contact the outer peripheral surface of the fixing bolts 42 when the compressive load is applied to the internally threaded nut 41. The flange 41b corresponds to a compressive load transmission member.

[0044] When an upward tensile load is applied to the embedded nut 41, the fixing bolt 42 is configured to receive the tensile load. The fixing bolt 42 thus prevents rotation with respect to the support pipe 20 of the embedded nut 41 and receives the tensile load applied to the support pipe 20. The fixing bolt 42 corresponds to a fastening member.

[0045] The threaded rod 44 is screwed into the female thread 41a of the embedded nut 41. When the threaded rod 44 is in a non-rotatable state about its axis, if the support pipe 20 rotates in the R direction in FIGS. 1 and 2, the amount of screwing into the embedded nut 41 increases, causing the threaded rod 44 to move in the T direction. Also, when rotating in the reverse R direction in FIGS. 1 and 2, the amount of screwing of the threaded rod 44 into the embedded nut 41 decreases, and the threaded rod 44 relatively moves in the reverse T direction. Thus, the threaded rod 44 is screwed into the embedded nut 41 so as to be freely movable forward and backward.

[0046] Also, the axial position adjustment of the threaded rod 44 with respect to the support pipe 20 is performed by rotating the support pipe 20 about its axis in the R direction or the reverse R direction. The inner end of the threaded rod 44 is arranged to protrude inward from the female thread forming portion of the embedded nut 41, and a retaining pin 46 is attached through it in the radial direction (see FIG. 4).

[0047] A hook 45 is integrally provided at the outer end of the threaded rod 44. A nut 43 having a female thread 43a is screwed onto the threaded rod 44. A pair of handles 43b protrude and are fixed at 180° opposite positions on the outer peripheral surface of the nut 43.

[0048] The nut 43 is arranged at a position spaced apart from the outer end surface of the embedded nut 41 when the position adjustment of the threaded rod 44 with respect to the support pipe 20 is performed. Then, after the position adjustment of the threaded rod 44 with respect to the support pipe 20 is completed, it is screwed in so as to closely contact the outer end surface of the embedded nut 41. This exerts a double-nut effect of preventing loosening of the embedded nut 41 with respect to the threaded rod 44 by the nut 43.

[0049] In addition, a hook lock body 47 is disposed on the threaded rod 44. The hook lock body 47 includes a nut portion 48 screwed onto the threaded rod 44 and a cylindrical lock portion 49 integrally connected to the nut portion 48. A handle 48a protrudes and is fixed to a position on the outer peripheral surface of the nut portion 48 that is 180° opposite.

[0050] The lock portion 49 is movable between a locked position (see FIG. 5) that covers the hook 45 and an unlocked position that releases the periphery of the hook 45 by rotating the nut portion 48 with respect to the threaded rod 44.

[0051] (Operation of the Embodiment) The operation of the built-in support 10 configured as described above will be described with reference to FIGS. 3 to 5. As shown in FIG. 5, it is assumed that the concrete floor slab 50 and the concrete wall panel 60 each have U-shaped anchors 52 and 62. A case will be described in which the built-in support 10 is interposed between the two to vertically support the concrete wall panel 60. The concrete floor slab 50 corresponds to the first structure. The concrete wall panel 60 corresponds to the second structure. The anchors 52 and 62 correspond to the parts to be attached.

[0052] Further, the built-in support 10 positions the hook lock bodies 37 and 47 at the unlocked position and separates the nuts 33 and 43 from the built-in nuts 31 and 41, respectively. In this state, the length of the support pipe 20 is determined by adjusting the insertion amount of the inner pipe 24 into the outer pipe 22 so as to be close to the distance between the anchors 52 and 62 of the concrete floor slab 50 and the concrete wall panel 60 and attaching the handle 25 shown in FIG. 1.

[0053] Thereafter, the hooks 45 and 35 of the built-in support 10 are respectively attached to the anchors 62 and 52 of the concrete wall panel 60 and the concrete floor slab 50. After both hooks 35 and 45 are hooked to the anchors 52 and 62, the hook lock bodies 37 and 47 are arranged at the locked position as shown in FIG. 5.

[0054] With the support pipe 20 attached to the concrete wall panel 60 and the concrete floor slab 50 as described above, by rotating the support pipe 20 in the R direction or the reverse R direction, the pair of threaded rods 34, 44 advance and retract with respect to the support pipe 20. As a result, the overall length of the built-in support 10 is adjusted for expansion and contraction, so that the concrete wall panel 60 is held perpendicular to the concrete floor slab 50. Further, after this adjustment is completed, the nuts 33, 43 are screwed in so as to closely contact the outer end surfaces of the internal nuts 31, 41 by being operated with the handles 33b, 43b.

[0055] As described above, assuming that a compressive load is applied to the threaded rods 34, 44 from the side of the concrete wall panel 60 in a state where the concrete wall panel 60 is held perpendicular to the concrete floor slab 50. Then, in the first attachment portion 30, since the flange 31b of the internal nut 31 screwed onto the threaded rod 34 is in surface contact with the lower end surface of the outer pipe 22, the lower end surface of the outer pipe 22 receives the compressive load.

[0056] Also, in the second attachment portion 40, since the flange 41b of the internal nut 41 screwed onto the threaded rod 44 is in surface contact with the upper end surface of the inner pipe 24, the upper end surface of the inner pipe 24 receives the compressive load.

[0057] Thereby, it is possible to improve the load-bearing capacity of the built-in support when a compressive load is applied through the threaded rods 34, 44 of the built-in support 10. That is, different from the conventional case, no shear load acts on the fixing bolts 32, 42, so there is no risk of shearing.

[0058] In addition, as described above, assuming that a tensile load is applied to the threaded rods 34, 44 from the side of the concrete wall panel 60 in a state where the concrete wall panel 60 is held perpendicular to the concrete floor slab 50. In this case, in the first attachment portion 30, the tensile load is received by the plurality of fixing bolts 32 that fix the internal nut 31 screwed onto the threaded rod 34 to the outer pipe 22 on the circumferential surface of the through hole 22b of the outer pipe 22.

[0059] Further, in the second attachment portion 40, a plurality of fixing bolts 42 that fix the internal nut 41 screwed onto the threaded rod 44 to the inner tube 24 will be received on the peripheral surface of the through hole 24b of the inner tube 24. This embodiment has the following features.

[0060] (1) The built-in support 10 of this embodiment has internal nuts 31 and 41 respectively fitted into the upper end portion and the lower end portion of the support tube 20 in the first attachment portion 30 and the second attachment portion 40.

[0061] Further, the built-in support 10 has fixing bolts 32 and 42 (fastening members) that penetrate radially with respect to the outer peripheral surface of the end portion of the support tube 20 (outer tube 22, inner tube 24) and are screwed onto the internal nuts 31 and 41. Thereby, the internal nuts 31 and 41 are prevented from rotating with respect to the support tube 20 and the tensile load applied to the support tube is received.

[0062] Further, the built-in support 10 has threaded rods 34 and 44 that are screwed onto the internal nuts 31 and 41 so as to be able to advance and retreat, and have hooks 35 and 45 at their outer ends for attaching to the attachment portions of the concrete floor slab 50 (first structure) and the concrete wall panel 60 (second structure).

[0063] Further, the threaded rods 34 and 44 are screwed with internal nuts 31 and 41 that have flanges 31b and 41b (compressive load transmission members) that are in surface contact with the end face of the support tube 20 and transmit the compressive load applied to the support tube 20 to the end face of the support tube 20.

[0064] As a result, when a compressive load is applied through the threaded rods 34 and 44 of the built-in support 10, this compressive load is applied to the end face of the support tube 20 that abuts against the flanges 31b and 41b. Thereby, it is possible to improve the load-bearing capacity of the built-in support when a compressive load is applied through the threaded rods 34 and 44 of the built-in support 10.

[0065] (2) In the built-in support 10 of this embodiment, the first attachment portion 30 and the second attachment portion 40 each have an embedded nut 31, 41, a fixing bolt 32, 42 (fastening member), and screw rods 34, 44. The screw rod 34 of the first attachment portion 30 and the screw rod 44 of the second attachment portion 40 are screwed into the embedded nuts 31 of the first attachment portion 30 and 41 of the second attachment portion 40 in a reverse screw relationship so as to be able to advance and retreat freely.

[0066] With the above configuration, the compressive load applied to the built-in support 10 is applied to both end faces of the support pipe 20 that contact the flanges 31b, 41b (compressive load transmission members) of the first attachment portion 30 and the second attachment portion 40. Thereby, the load-bearing capacity of the built-in support can be improved.

[0067] (3) The support pipe 20 of the built-in support 10 of this embodiment includes an outer pipe 22 and an inner pipe 24 that is inserted and arranged in the outer pipe 22 so as to be axially position-adjustable. In the built-in support 10 configured in this way, the operation and effect of (1) above can be easily realized.

[0068] <Second Embodiment> Next, the second embodiment will be described with reference to FIGS. 6 and 7. In the following embodiments including this embodiment, the same components or corresponding components as those of the embodiments already described are denoted by the same reference numerals, and the detailed description thereof is omitted, and different components will be described.

[0069] In the built-in support 10 of this embodiment, the first attachment portion 75 of the outer pipe 22 of the support pipe 20 can be detachably attached to a horizontally U-shaped shaft support member 80 fixed to the concrete floor slab 50. The shaft support member 80 has a bottom plate 80b facing the concrete floor slab 50 and a pair of side plates 80a bent upward from both sides of the bottom plate 80b.

[0070] As shown in Fig. 7, the first attachment portion 75 is composed of a bolt 82 that is detachably inserted through the lower end portion of the outer tube 22 positioned between the both side plates 80a, and a nut 83 screwed onto the tip end portion of the bolt 82. Further, the outer tube 22 is rotatable around the bolt 82.

[0071] As shown in Fig. 6, the second attachment portion 40 of the inner tube 24 includes the same constituent members as the second attachment portion 40 of the first embodiment. Further, as shown in Fig. 6, a through hole 44a penetrating in the radial direction is formed in the threaded rod 44, and an operation rod 70 can be inserted through and arranged in the through hole 44a in a detachable manner.

[0072] (Operation of the Second Embodiment) In this embodiment, as shown in Fig. 7, the lower end of the outer tube 22 is attached by the first attachment portion 75. Further, by operating the operation rod 70 inserted through the through hole 44a as shown in Fig. 6, the threaded rod 44 is screwed into or out of the internally threaded nut 41. After adjusting the length of the built-in support 10 thereby, the hook 45 of the second attachment portion 40 is attached to the anchor of the concrete wall panel 60. Further, after this adjustment is completed, the nut 43 is screwed in by operating with the handle 43b so as to be in close contact with the outer end surface of the internally threaded nut 41.

[0073] In this embodiment, it is assumed that a compressive load is applied to the threaded rod 44 from the side of the concrete wall panel 60 in a state where the concrete wall panel 60 is held vertically with respect to the concrete floor slab 50. Then, in the first attachment portion 75, the bolt 82 receives the compressive load.

[0074] Further, in the second attachment portion 40 shown in Fig. 6, since the flange 41b of the internally threaded nut 41 screwed onto the threaded rod 44 is in surface contact with the upper end surface of the inner tube 24, the compressive load is received by the upper end surface of the inner tube 24.

[0075] Thereby, it is possible to improve the load-bearing capacity of the built-in support when a compressive load is applied through the threaded rod 44 of the built-in support 10. <Third Embodiment> Next, the built-in support 10 of the third embodiment will be described with reference to FIG. 8.

[0076] In this embodiment, in the configuration of the first embodiment, the flange of the built-in nut is omitted. In FIG. 8, it is shown that the flange 41b of the built-in nut 41 is omitted. Although not shown, the flange 31b of the built-in nut 31 is similarly omitted.

[0077] Instead, as shown in FIG. 8, a fixing nut 90 that is in surface contact with and abuts against the upper end surface of the inner tube 24 and the built-in nut 41 is screwed onto the screw rod 44. A handle 90a protrudes and is fixed to a portion of the outer peripheral surface of the fixing nut 90 that is 180° opposite. The fixing nut 90 corresponds to a compression load transmission member. Further, the fixing nut 90 abuts against the built-in nut 41 in surface contact, thereby preventing the built-in nut 41 from loosening with respect to the screw rod 44.

[0078] Although not shown, a fixing nut that is in surface contact with and abuts against the lower end surface of the outer tube 22 and the built-in nut 31 is screwed onto the screw rod 34. The fixing nut corresponds to a compression load transmission member. Further, the fixing nut abuts against the built-in nut 31 in surface contact, thereby preventing the built-in nut 31 from loosening with respect to the screw rod 34.

[0079] The built-in support 10 configured as described above realizes the same operation as in the first embodiment with the fixing nut 90 and the like instead of the flanges 31b and 41b of the first embodiment. <Fourth Embodiment> Next, the built-in support 10 of the fourth embodiment will be described with reference to FIG. 9.

[0080] In this embodiment, as shown in FIG. 9, in the second attachment portion 40, a cylindrical tube portion 41d that covers the peripheral surface of the upper end portion of the inner tube 24 is formed on the outer periphery of the flange 41b of the built-in nut 41. A female screw 41e is formed on the inner peripheral surface of the tube portion 41d.

[0081] When the built-in nut 41 is inserted into the inner tube 24, the male screw 24c threaded on the outer peripheral surface of the inner tube 24 is screwed with the female screw 41e of the cylindrical portion 41d, and the flange 41b is arranged to be in surface contact with the upper end surface of the inner tube 24.

[0082] Although not shown in the figure, similarly in the first attachment portion 30, a cylindrical portion that covers the peripheral surface of the lower end portion of the outer tube 22 is formed on the outer periphery of the flange 31b of the built-in nut 31. A female screw (not shown) is formed on the inner peripheral surface of the cylindrical portion.

[0083] When the built-in nut 31 is inserted into the outer tube 22, the male screw threaded on the outer peripheral surface of the outer tube 22 is screwed with the female screw of the cylindrical portion, and the flange 31b is arranged to be in surface contact with the lower end surface of the outer tube 22.

[0084] The built-in support 10 configured as described above has the flanges 31b and 41b in surface contact with the lower end surface of the outer tube 22 and the flange 41b in surface contact with the upper end surface of the inner tube 24, similarly to the first embodiment. As a result, the same operation as in the first embodiment is realized.

[0085] <Fifth Embodiment> Next, the built-in support 10 of the fifth embodiment will be described with reference to FIG. 10. In the present embodiment, in the configuration of the fourth embodiment, the male screw 24c, the cylindrical portion 41d, and the female screw 41e of the second attachment portion 40, and the male screw, the cylindrical portion, and the female screw of the first attachment portion 30 are omitted. Instead, the flanges 31b and 41b are caulked to the peripheral surface of the lower end portion of the outer tube 22 and the peripheral surface of the upper end portion of the inner tube 24 by the caulking portion 41f. In FIG. 10, the flange 41b of the built-in nut 41 in the second attachment portion 40 being caulked by the caulking portion 41f is shown. Also in the present embodiment, the built-in support 10 has the flanges 31b and 41b in surface contact with the lower end surface of the outer tube 22 and the flange 41b in surface contact with the upper end surface of the inner tube 24, similarly to the first embodiment.

[0086] As a result, the same operation as in the first embodiment is realized. This embodiment can be implemented with the following modifications. This embodiment and the following modification examples can be implemented in combination with each other within a technically non - conflicting range.

[0087] · In the first embodiment and the like, the female screw 31a is a right - hand screw, and the female screw 41a is a left - hand screw, making the two in a reverse - screw relationship. Alternatively, the female screw 31a can be a left - hand screw and the female screw 41a can be a right - hand screw, forming a reverse - screw relationship.

[0088] · In the first embodiment and the like, the flanges 31b and 41b are provided over the entire circumferential direction of the embedded nuts 31 and 41, but the present invention is not limited to this configuration. The flanges 31b and 41b may be formed by partially cutting them out.

[0089] In this case, the contact area between the flange 31b and the end face of the lower end portion of the outer tube 22 may be larger than the projected area in the through - hole 22b region when the plurality of fixing bolts 32 are projected in the axial direction of the outer tube 22.

[0090] Also, the contact area between the flange 41b and the end face of the upper end portion of the inner tube 24 may be larger than the projected area in the through - hole 24b region when the plurality of fixing bolts 42 are projected in the axial direction of the inner tube 24.

[0091] · In the first embodiment, the first structure is a concrete floor slab 50, but the first structure is not limited to a concrete floor slab. · In the first embodiment, the second structure is a concrete wall panel 60, but the second structure is not limited to a concrete wall panel and may be, for example, a formwork or the like.

Explanation of Reference Numerals

[0092] 10…Built - in support 20…Support pipe 22…Outer tube 22a…Through - hole 22b…Through - hole 24…Inner tube 24a…Through - hole 24b…Perforation 24c…Male screw 25…Handle 25a…Insertion end 26…Pin 30…First mounting part 31…Insert nut 31a…Female screw 31b…Flange (compression load transfer member) 31c…Female screw hole 32…Fixing bolt (fastening member) 33…Nut 33a…Female screw 33b…Handle 34…Screw rod 35…Hook 36…Retaining pin 37…Hook locking body 38…Nut part 38a…Handle 39…Locking part 41…Insert nut 41a…Female screw 41b…Flange (compression load transfer member) 41c…Female screw hole 41d…Cylindrical part 41e…Female screw 41f…Caulking part 42…Fixing bolt (fastening member) 43…Nut 43a…Female screw 43b…Handle 44…Screw rod 44a…Through hole 45…Hook 46…Retaining pin 47…Hook locking body 48…Nut part 48a…Handle 49…Locking part 50…Concrete floor slab (first structure) 52…Anchor 60…Concrete wall panel (second structure) 62…Anchor 70…Operating rod 75…First mounting part 80…Shaft support member 80a... Side plate 80b... Bottom plate 82... Bolt 83... Nut 90... Fixed nut (compression load transmission member) 90a... Handle

Claims

1. A built-in support having a first attachment portion attached to a first structure at the lower end of a support pipe, and a second attachment portion attached to a second structure disposed perpendicular to the first structure at the upper end of the support pipe, wherein at least one of the first attachment portion and the second attachment portion includes an internally fitted nut fitted inside an end of the support pipe, a fastening member that penetrates radially with respect to an outer peripheral surface of an end of the support pipe and is screwed to the internally fitted nut to prevent rotation of the internally fitted nut with respect to the support pipe and receive a tensile load applied to the support pipe, a screw rod that is screwed to the internally fitted nut so as to be movable forward and backward, and has a hook at an outer end for attaching to an attachment portion of the first structure or the second structure, a built-in support in which a compression load transmission member that is in surface contact with an end surface of the support pipe and transmits a compression load applied to the support pipe to the end surface of the support pipe is screwed to the screw rod.

2. The built-in support according to claim 1, wherein the compression load transmission member is a flange formed on an outer periphery of the internally fitted nut.

3. The built-in support according to claim 2, wherein the flange has a cylindrical portion that is screwed to a male screw engraved on an outer periphery of the support pipe.

4. The built-in support according to claim 2, wherein the flange has a caulked portion caulked to an outer periphery of the support pipe.

5. The built-in support according to claim 1, wherein the compression load transmission member is a fixing nut disposed in contact with an outer end of the internally fitted nut to prevent loosening of the internally fitted nut with respect to the screw rod.

6. The first attachment portion and the second attachment portion each have the internally fitted nut, the fastening member, and the screw rod, The built-in support according to any one of claims 1 to 5, wherein the screw rod of the first attachment portion and the screw rod of the second attachment portion are screwed to the internally fitted nut of the first attachment portion and the internally fitted nut of the second attachment portion so as to be movable forward and backward in a reverse screw relationship.

7. The built-in support according to claim 6, wherein the support pipe includes an outer pipe and an inner pipe inserted and disposed in an axially adjustable manner with respect to the outer pipe.

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