Connection structure between wooden column lower end and concrete surface

Abstract

To provide a connection structure that eases the works of fitting and connecting a wooden column to a concrete surface at a construction site and can anchor hollow steel rods to the inside of steel-rod-fixing holes in a stable condition.SOLUTION: A connection structure is constituted by: comprising multiple steel-rod-fixing holes 12 formed by drilling on the lower end surface 11b of a wooden column 11 and bolt-securing holes 21 to secure anchor bolts 31; and including a metallic base plate 20 on which multiple hollow steel rods 22, which are to be inserted and fixed in the steel-rod-fixing holes 12, are erected. The multiple steel-rod-fixing holes 12 on the wooden column 11, and multiple tap holes 24 on the base plate 20 in which the hollow steel rods 22 are erected with screw threads, are formed so as to have the facing holes arranged at relative positions with the center positions of the facing holes matching. A fill-and-fix agent 14, which is injected into the gap around the inserted hollow steel rod 22 in each steel-rod-fixing hole 12 via the hollow steel rod 22, fills the perimeter all around the hollow steel rod 22 and solidifies.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a joint structure for the upright lower end of a wooden pillar to a concrete surface, and more particularly to a joint structure for the upright lower end of a wooden pillar to a concrete surface for attaching the wooden pillar by standing it upright from a concrete surface on which anchor bolts are arranged. [Background technology]

[0002] In recent years, various techniques have been proposed for incorporating wooden structural components into concrete-based buildings, preferably with consideration for the environment. For example, as a structure for joining wooden columns while they are erected on a concrete surface such as a reinforced concrete slab, a joint structure using the GIR method is being considered, in which hollow steel rods are inserted into fastening holes drilled in the wooden components, and a filling and hardening agent is filled into the fastening holes via the inserted hollow steel rods and allowed to harden, thereby joining the components together.

[0003] Furthermore, for example, Patent Documents 1 and 2 listed below disclose joint structures for joining precast concrete columns in an upright position to the surface of a reinforced concrete slab. In these joint structures, the main column reinforcement is inserted partway through a splice sleeve placed at the bottom end, and these are then embedded together with tie bars to form a precast concrete column. The column is then erected on a leveler placed on the slab, with the main reinforcement protruding from the slab surface inserted into the splice sleeve. A grout formwork is then placed around the bottom end of the column, and mortar is then injected into the splice sleeve and into the gap between the splice sleeve and the slab surface, and allowed to harden, joining the bottom surface of the column to the slab surface and the main column reinforcement above and below. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 4-52815 [Patent Document 2] Japanese Unexamined Patent Publication No. 7-18738 Summary of the Invention [Problem to be solved by the invention]

[0005] When using the GIR method to join wooden pillars while they are standing on a concrete surface, similar to the structure of the joints of the conventional precast concrete pillars described above, it is possible to join the wooden pillars while they are standing on the concrete surface by, for example, having multiple hollow steel rods protruding from a concrete surface such as a reinforced concrete slab via a metal base plate, inserting each hollow steel rod into multiple steel rod fixing holes drilled in the lower end surface of the wooden pillar, and then injecting a filling and solidifying agent into each of the steel rod fixing holes through the hollow steel rods and solidifying it, thereby joining the wooden pillars while they are standing on the concrete surface.

[0006] However, when this same technology used for the joint structure of precast concrete columns is applied to wooden columns, it takes a lot of effort to accurately erect multiple hollow steel rods from their predetermined positions so that they correspond to each of the multiple steel rod fixing holes drilled into the bottom end surface of the wooden column.In addition, if the positions of the hollow steel rods are even slightly misaligned or tilted, it becomes difficult to erect the wooden column on the concrete surface at the construction site while simultaneously inserting the multiple hollow steel rods into each of the steel rod fixing holes.

[0007] In particular, when a wooden pillar is erected on a concrete surface at a construction site, if the hollow steel rod is inserted into a small-diameter steel rod fixing hole with its position slightly misaligned or tilted, it becomes difficult to inject the filling solidifying agent around the entire circumference of the hollow steel rod into the gap between it and the inner surface of the steel rod fixing hole, making it difficult to stably fix the hollow steel rod inside the steel rod fixing hole.

[0008] The present invention aims to provide a joint structure for the upright lower end of a wooden pillar to a concrete surface, which facilitates the work of erecting and joining a wooden pillar to a concrete surface at a construction site and enables a hollow steel rod to be stably fixed inside the steel rod fixing hole. [Means for solving the problem]

[0009] The present invention provides a structure for attaching a wooden pole by standing it upright from a concrete surface on which anchor bolts are arranged, and is a joint structure for connecting the standing lower end of the wooden pole to the concrete surface, the joint structure being provided at the standing lower end of the wooden pole, the joint structure including a metal base plate having a plurality of steel rod fixing holes drilled and extending axially from the lower end surface of the wooden pole, and bolt fastening holes for fastening the anchor bolts, and having a plurality of hollow steel rods standing upright, the hollow steel rods being inserted and fastened into the steel rod fixing holes of the wooden pole, the lower end surface of the wooden pole having positioning fitting holes formed therein, and the base plate having positioning protrusions fitted into the positioning fitting holes to prevent the base plate from shifting in position relative to the lower end surface of the wooden pole, and the hollow steel rods being screwed into the base plate such that one end opening faces the lower surface of the base plate and the other end opening side is fitted to the base plate. and a plurality of tap holes are formed in the base plate so that the positioning projections are fitted into the positioning fitting holes to bring the base plate into close contact with the lower end surface of the wooden post, and the plurality of steel rod fixing holes and the plurality of tap holes are formed in a positional relationship such that the center positions of the plurality of steel rod fixing holes can be aligned so that, when the plurality of hollow steel rods erected from the tap holes are inserted into the steel rod fixing holes, a gap of a predetermined width is maintained around the entire circumference between the inner surface of the steel rod fixing hole and the hollow steel rod, and in each of the steel rod fixing holes, the gap between the inserted hollow steel rod is filled with a filling hardening agent injected through the hollow steel rod and hardened, thereby achieving the above-mentioned object by providing a joint structure for connecting the erect lower end of the wooden post to a concrete surface, in which the base plate to which the hollow steel rods are attached is fixed as a single unit to the erect lower end of the wooden post.

[0010] Furthermore, the joint structure of the erected lower end of the wooden pillar of the present invention to the concrete surface is preferably such that the wooden pillar has a rectangular cross-sectional shape, and the metal base plate has a rectangular planar shape that is one size larger than the rectangular cross-sectional shape of the wooden pillar, and the base plate has a plurality of tapped holes formed in a rectangular ring shape, each corresponding to the position of the plurality of steel rod fixing holes drilled and formed in the wooden pillar, and the positioning protrusion is provided in the inner area surrounded by the plurality of tapped holes formed in a rectangular ring shape, corresponding to the position of the positioning fitting hole in the wooden pillar, and the bolt fastening hole for fastening the anchor bolt is formed in the outer area of ​​the plurality of tapped holes formed in a rectangular ring shape.

[0011] Furthermore, it is preferable that the joint structure of the erected lower end of the wooden pillar of the present invention to the concrete surface is such that the positioning fitting hole is a fitting hole with a circular cross-sectional shape formed in the central part of the lower end surface of the wooden pillar, and the positioning protrusion is a protrusion with a circular cross-sectional shape protruding from the central part of the inner area surrounded by the plurality of tap holes arranged in a rectangular ring shape.

[0012] Furthermore, it is preferable that the joint structure of the erected lower end of the wooden pillar of the present invention to the concrete surface has a plurality of screw holes formed in the inner area of ​​the base plate surrounded by the plurality of tap holes, and that screws or nails are driven through these screw holes toward the lower end surface of the wooden pillar. [Effects of the Invention]

[0013] The joint structure of the present invention, at which the erected lower end of a wooden pillar is joined to a concrete surface, facilitates the work of erecting and joining the wooden pillar to a concrete surface at the construction site, and also enables a hollow steel rod to be stably fixed inside the steel rod fixing hole. [Brief explanation of the drawings]

[0014] [Figure 1]1 is a schematic cross-sectional view illustrating a state in which a wooden post is erected on a concrete surface via a joint structure at the erected lower end of the wooden post to the concrete surface according to a preferred embodiment of the present invention. FIG. [Figure 2] FIG. 1 is a bottom view of a wooden pole. [Figure 3] FIG. 1(a) is a top view of the base plate, and FIG. 1(b) is a schematic cross-sectional view taken along the line AA in FIG. [Figure 4] 10(a) and 10(b) are schematic cross-sectional views illustrating a state in which a base plate is fixed integrally to the upright lower end of a wooden pole. [Figure 5] FIG. 2 is a schematic cross-sectional view illustrating a state in which a plurality of hollow steel rods are erected on a base plate. [Figure 6] 10(a) and 10(b) are schematic cross-sectional views illustrating a state in which a base plate with a plurality of hollow steel rods standing upright is integrally fixed to the lower end of a wooden pole. [Figure 7] 1 is a schematic cross-sectional view illustrating a situation in which a base plate with a plurality of hollow steel rods erected thereon is integrally fixed to the erect lower end of a wooden pillar. [Figure 8] 10(a) to 10(c) are explanatory diagrams of the process of erecting a wooden pillar and joining its lower upright end to a concrete surface at a construction site. DETAILED DESCRIPTION OF THE INVENTION

[0015] In a preferred embodiment of the present invention, the joint structure 10 for the lower end of a wooden pillar to a concrete surface is provided at the lower end 11a of the wooden pillar 11, allowing the wooden pillar 11 to be easily erected smoothly and stably when the wooden pillar 11 is joined in an upright position to a concrete surface 30a on top of a reinforced concrete slab 30 using the GIR method, which is known as a method of joining components by inserting a hollow steel rod 22 into a steel rod fixing hole (steel rod fixing hole) 12 drilled in the wooden pillar 11, which is a wooden member, and filling and solidifying a filling and solidifying agent 14 into the steel rod fixing hole 12 via the inserted hollow steel rod 22. Furthermore, the joint structure 10 of this embodiment is provided in advance at the upright lower end 11a of the wooden pillar 11, which facilitates the work of erecting and joining the wooden pillar 11 to the concrete surface 30a at the construction site (see Figures 8(a) to (c)), and also enables the hollow steel rod 22 to be stably fixed inside the steel rod fixing hole 12, preferably by work carried out in a factory or the like.

[0016] 1 and 7, the joint structure 10 of the upright lower end of the wooden pillar to the concrete surface of this embodiment is a joint structure provided at the upright lower end 11a of the wooden pillar 11 as a structure for attaching the wooden pillar 11 by erecting it from, for example, the top surface of a reinforced concrete slab 30, as a concrete surface 30a on which anchor bolts 31 are arranged, and is composed of a metal base plate 20 having a plurality of steel rod fixing holes 12 drilled and extending axially from the lower end surface 11b of the wooden pillar 11, and bolt fastening holes 21 for fastening the anchor bolts 31, and having a plurality of hollow steel rods 22 erected thereon to be inserted and fastened to the steel rod fixing holes 12 of the wooden pillar 11 (see FIG. 5).

[0017] A positioning fitting hole 13 is formed in the lower end surface 11b of the wooden pillar 11 (see Figure 2), and the base plate 20 is provided with a positioning protrusion 23 (see Figure 3(b)) that is fitted into the positioning fitting hole 13 to prevent the base plate 20 from shifting position relative to the lower end surface 11b of the wooden pillar 11.The base plate 20 also has a plurality of tapped holes 24 (see Figures 3(a) and (b)) that are each screwed into a hollow steel rod 22, with one end opening 22a facing the underside of the base plate 20 and the other end opening 22b standing upright from the base plate 20 (see Figure 5).

[0018] The steel rod fixing holes 12 and the tapped holes 24 are formed so as to have a positional relationship in which the center positions of the holes can be aligned so that, when the positioning projections 23 are fitted into the positioning fitting holes 13 and the base plate 20 is in close contact with the lower end surface 11b of the wooden pillar 11, and when the hollow steel rods 22 erected from the tapped holes 24 are inserted into the steel rod fixing holes 12 (see FIGS. 6(a) and 6(b)), a predetermined gap of a predetermined width is maintained around the entire circumference between the inner circumferential surface of the steel rod fixing hole 12 and the hollow steel rod 22. In each steel rod fixing hole 12, the gap between the inserted hollow steel rod 22 is filled with the filling hardener 14 injected through the hollow steel rod 22 and hardened, so that the base plate 20 with the hollow steel rods 22 attached is fixed integrally to the erect lower end 11a of the wooden pillar 11 (see FIG. 7).

[0019] In this embodiment, the wooden post 11 has a rectangular cross-sectional shape (see FIG. 2), and the metal base plate 20 has a rectangular planar shape that is slightly larger than the rectangular cross-sectional shape of the wooden post 11 (see FIG. 3(a)). The base plate 20 has a plurality of tapped holes 24 arranged in a rectangular ring shape, corresponding to the positions of the plurality of steel rod fastening holes 12 drilled and formed in the wooden post 11, and a positioning protrusion 23 is provided in the inner region surrounded by the plurality of tapped holes 24 arranged in a rectangular ring shape, corresponding to the positions of the positioning fitting holes 13 in the wooden post 11. Bolt fastening holes 21 for fastening anchor bolts 31 are formed in the outer region of the plurality of tapped holes 24 arranged in a rectangular ring shape.

[0020] Furthermore, in this embodiment, the positioning fitting hole 13 is a fitting hole with a circular cross-sectional shape formed in the center part of the lower end surface 11b of the wooden pillar 11 (see Figure 2), and the positioning protrusion 23 is a protrusion with a circular cross-sectional shape protruding from the center part of the inner area surrounded by multiple tapped holes 24 arranged in a rectangular ring shape (see Figures 3(a) and (b)).

[0021] Furthermore, in this embodiment, a plurality of screw holes 25 are formed in the inner region of the base plate 20, which is surrounded by a plurality of tap holes 24, and fixing screws or fixing nails (preferably fixing screws in this embodiment) 26 are driven through these screw holes 25 toward the lower end surface 11b of the wooden post 11 (see Figure 7).

[0022] In this embodiment, the wooden column 11, whose lower end 11a is provided with the joint structure 10, is made of, for example, laminated veneer lumber (LVL) and is obtained using a large-section timber having a rectangular (square) cross-section, preferably measuring approximately 350 mm to 540 mm in length and width, and is formed to have a length of approximately 6 to 12 m, corresponding to a predetermined floor height. As shown in Fig. 2, a plurality of steel rod fixing holes 12, each with an inner diameter of approximately 30 mm, are drilled in the lower end surface 11b of the wooden column 11, at a pitch of approximately 60 mm, along an imaginary rectangular loop measuring, for example, approximately 420 mm in length and width, extending parallel to one another from the lower end surface 11b upward in the axial direction of the wooden column 11, to a drilling depth of, for example, approximately 380 to 680 mm. In addition, in the center of these inner areas surrounded by multiple steel rod fixing holes 12 arranged in succession along a rectangular virtual ring line, a positioning fitting hole 13 having a circular hollow cross-sectional shape with an inner diameter of, for example, about 32 mm is formed to a depth of, for example, about 75 mm in the axial direction of the wooden pillar 11.

[0023] 3(a) and 3(b), the base plate 20, which constitutes the joint structure 10 together with the plurality of steel rod fixing holes 12 formed in the wooden pillar 11, is made of a metal plate member, for example, a steel plate with a thickness of about 36 mm, and preferably has a rectangular (square) planar shape, for example, about 700 mm in length and width, which is slightly larger than the rectangular cross-sectional shape of the wooden pillar 11. A circular fitting hole 23a with an inner diameter of about 32.5 mm is formed in the center of the base plate 20, and a cylindrical steel positioning protrusion 23 with a diameter of about 32 mm is attached by fitting its base end into this circular fitting hole 23a and welding it, for example, so that it protrudes from the top surface of the base plate 20 by a length of about 70 mm.

[0024] In addition, the base plate 20 has a plurality of tapped holes 24 with a screw diameter of about M24 for screwing in hollow steel rods 22, which correspond to the plurality of steel rod fixing holes 12 that are drilled and arranged in a rectangular ring shape on the lower end surface 11b of the wooden pillar 11.The tapped holes 24 are arranged in a rectangular ring shape at a pitch of, for example, about 60 m around the outer periphery of the positioning protrusion 23, along a rectangular virtual ring line similar to the virtual ring line along which the steel rod fixing holes 12 are arranged.

[0025] Furthermore, in the base plate 20, outside the multiple tap holes 24 arranged in a rectangular ring, in an area that protrudes from the lower end surface 11b of the upright lower end portion 11a when joined to the wooden pillar 11, multiple bolt fastening holes 21 are formed as joining means 28 to fasten to anchor bolts 31 protruding from the concrete surface 30a of the upper surface of the reinforced concrete slab 30, and these holes correspond to the positions from which the multiple anchor bolts 31 protrude at each joining point where the wooden pillar 11 is erected.

[0026] Furthermore, the base plate 20 has four screw holes 25 formed in an inner region surrounded by the multiple tapped holes 24 arranged in a rectangular ring, each positioned at a corner of a virtual ring line of a smaller rectangle. Hollow steel rods 22 are inserted into the multiple steel rod fastening holes 12 of the wooden post 11, and with the upper surface of the base plate 20 in close contact with the lower end surface 11b of the standing lower end portion 11a, fixing screws 26 are preferably driven into the multiple screw holes 25 at the four locations toward the lower end surface 11b of the wooden post 11. This makes it possible to firmly attach the base plate 20 to the lower end surface 11b of the standing lower end portion 11a as a unit while preventing any rotational displacement relative to the lower end surface 11b.

[0027] Furthermore, the gap-filling adhesive 27 can be preferably applied within the area defined by an imaginary rectangular ring line in which screw holes 25 are formed at each of the four corners. This allows the upper surface of the base plate 20 to be tightly attached to the lower end surface 11b of the lower standing end 11a of the wooden post 11 in a more stable state, thereby joining the base plate 20 integrally to the lower standing end 11a of the wooden post 11.

[0028] The hollow steel rods 22 are each threaded into the tapped holes 24 of the base plate 20, with one end opening 22a facing the underside of the base plate 20 and the other end opening 22b standing upright from the base plate 20. These rods may be cylindrical steel rods with a hollow interior through which the fluid filling solidification agent 14 can flow, which are known as connector members used in the GIR method. The hollow steel rods 22 have an outer diameter of, for example, about 24 mm, and preferably have a male thread ridge formed on their outer periphery. The hollow steel rods 22 are attached to the base plate 20 by screwing their base ends into the respective tapped holes 24, with one end opening 22a facing the underside of the base plate 20 and the other end opening 22b extending parallel to each other perpendicular to the base plate 20 and to a length, for example, about 350 to 650 mm, which is slightly shorter than the drilling depth of the steel rod fixing holes 12 formed in the wooden pillars 11.

[0029] Each of the hollow steel rods 22 attached to the base plate 20 is inserted into a corresponding one of the steel rod fixing holes 12 in the wooden column 11, and the base plate 20 is attached to the upright lower end 11a of the wooden column 11 with the top surface of the base plate 20 in close contact with the bottom end surface 11b of the upright lower end 11a. Then, a known filling hardener 14, such as epoxy resin, is injected into the base plate 20 from one end opening 22a facing the bottom surface using a known adhesive injection gun used in the GIR method. The injected fluid filling hardener 14 passes through the hollow interior of the hollow steel rod 22 and is discharged from the other end opening 22b inserted into the steel rod fixing hole 12, filling the steel rod fixing hole 12 from its deepest part to the gap between the hollow steel rod 22 and the outer surface of the hollow steel rod 22, over the entire circumference and length. As the filling solidification agent 14 filled in the steel rod fixing hole 12 solidifies, a joint structure 10 is obtained in this embodiment in which a base plate 20 having a hollow steel rod 22 is joined integrally to the upright lower end 11a of the wooden pillar 11, and the wooden pillar's upright lower end to the concrete surface.

[0030] The joint structure 10 of the above-mentioned vertical lower end of the wooden pillar to the concrete surface, in which the base plate 20 having the hollow steel rod 22 is integrally joined to the vertical lower end 11a of the wooden pillar 11, can be easily and accurately formed, for example, in a manufacturing factory for the wooden pillar 11, as follows.

[0031] That is, for example, in a manufacturing factory for wooden pillars 11, a wooden timber, preferably having a rectangular cross-section of a predetermined size, serving as the raw material for wooden pillars 11, is placed on its side on a work platform, and an operator operates a drilling device while facing the lower end surface 11b of the lower end portion 11a, which is facing sideways. This allows for easy and accurate drilling of multiple steel rod fastening holes 12 at each predetermined position and to a predetermined drilling depth. After the multiple steel rod fastening holes 12 are drilled in the lower end surface 11b of the lower end portion 11a, as shown in Figures 4(a) and 4(b), the base plate 20 with the protruding positioning protrusions 23 before attaching the hollow steel rods 22 is aligned along the lower end surface 11b of the lower end portion 11a (the end face of the wooden pillar 11) while fitting the positioning protrusions 23 into the positioning fitting holes 13, and it is confirmed that there are no gaps between the base plate 20 and the lower end surface 11b of the lower end portion 11a.

[0032] 5, the base ends of the hollow steel rods 22 are screwed into the tapped holes 24 of the base plate 20, and the hollow steel rods 22 are set in a state where one end opening 22a faces the underside of the base plate 20 and the other end openings 22b are perpendicular to the base plate 20 and parallel to each other. After the hollow steel rods 22 are set, they are visually inspected to ensure that they are standing at a predetermined length and that they are not tilted or inclined. Furthermore, if necessary, an adhesive such as an epoxy resin is applied as a gap-filling adhesive 27 to fill the gap between the lower end surface 11b of the standing lower end 11a and the base plate 20, for example, to the area inside the imaginary rectangular loop line where the screw holes 25 are formed at each of the four corners.

[0033] Furthermore, as shown in Figures 6(a) and (b), when the wooden pillar 11 is laid on its side, the base plate 20 having a plurality of hollow steel rods 22 erected thereon is placed against the lower end surface 11b of the lower end portion 11a of the wooden pillar 11, which has a plurality of steel rod fixing holes 12 formed therein. The base plate 20 is slid laterally toward the lower end surface 11b of the lower end portion 11a so that each hollow steel rod 22 is inserted into the steel rod fixing holes 12, and the positioning protrusions 23 are fitted into the positioning fitting holes 13 in the lower end surface 11b of the lower end portion 11a to position it, and the base plate 20 is brought into close contact with the lower end surface 11b of the lower end portion 11a.

[0034] Once the base plate 20 is attached to the wooden post 11 by adhering it to the lower end surface 11b of the lower end portion 11a, as shown in Fig. 7, the base plate 20 can be fixed to the lower end surface 11b of the lower end portion 11a while preventing misalignment in the rotational direction relative to the lower end surface 11b by driving, for example, fixing screws 26 into the four screw holes 25 described above toward the lower end surface 11b. Furthermore, by facing the lower end surface 11b of the lower end portion 11a of the wooden post 11 that has been laid on its side, a worker can easily inject a filling hardener 14, such as an epoxy resin, into the steel rod fixing hole 12 from one end opening 22a of the hollow steel rod 22 that protrudes toward the underside of the fixed base plate 20 using a known adhesive injection gun. As described above, the injected fluidized filling and solidifying agent 14 passes through the hollow interior of the hollow steel rod 22 and is discharged from the other end opening 22b inserted into the steel rod fixing hole 12, so that the steel rod fixing hole 12 is smoothly filled from the deepest part of the steel rod fixing hole 12 to the gap between the outer surface of the hollow steel rod 22 and the entire circumference and length of the steel rod fixing hole 12. Furthermore, as the filled filling and solidifying agent 14 hardens, it becomes possible to easily obtain a joint structure 10 to the concrete surface of the erected lower end of the wooden pillar of this embodiment using the GIR method.

[0035] As described above, the wooden pillar 11 having the joint structure 10 of this embodiment provided at its lower erected end 11a is preferably transported from a manufacturing factory to a construction site, and at the construction site, as shown in Figures 8(a) to (c), it is erected on a concrete surface 30a, which is the surface to be joined, for example, the upper surface of a reinforced concrete slab 30, and can be smoothly joined as a single unit while standing upright from the concrete surface 30a.

[0036] That is, at the construction site, the upper end portions of embedded anchor bolts 31 protrude in series at positions corresponding to the bolt fastening holes 21 formed in a rectangular ring shape in the base plate 20 at the joint on the concrete surface 30a of the joined surface, for example, the upper surface of a reinforced concrete slab 30, and a leveling board 32 made of, for example, steel or mortar is installed in the inner region of the upper end portions of the connected anchor bolts 31 (see FIGS. 8(a) and 8(b)). The transported wooden pillar 11 is lifted using a heavy lifting machine such as a crane and erected at the joint on the upper surface of the slab 30, and the upper end portions of the anchor bolts 31 are inserted into each of the bolt fastening holes 21 formed in a rectangular ring shape in the base plate 20, and the inner region surrounded by the bolt fastening holes 21 of the base plate 20 is placed on the upper surface of the leveling board 32. By placing the base plate 20 on the upper surface of the level adjustment board 32, the height position of the wooden pillar 11 can be adjusted and interference between one end opening 22a of each of the multiple hollow steel rods 22 protruding from the underside of the base plate 20 and the concrete surface 30a caused by the upper surface of the slab 30 can be avoided.

[0037] The base plate 20 is placed on the top surface of the level-adjusting board 32, and the wooden pillar 11 is erected. Then, a nut member, for example, is screwed onto the upper end of the anchor bolt 31 inserted into each bolt fastening hole 21 to fasten the anchor bolt 31 to the base plate 20. At the same time, the gap between the base plate 20 and the concrete surface 30a, which is held on the outer periphery of the level-adjusting board 32, is filled with, for example, mortar as a filling and solidifying material 33 and allowed to harden (see Figure 8(c)). This makes it possible to erect the wooden pillar 11 from the concrete surface 30a, which is, for example, the top surface of the reinforced concrete slab 30, and join it in a stable state.

[0038] Therefore, in this embodiment, a wooden pillar 11 having the above-mentioned joint structure 10 to the concrete surface at its upright lower end 11a can be easily joined by erecting the wooden pillar 11 from the concrete surface 30a formed by the upper surface of the slab 30 using the GIR method of joining wooden members to the concrete surface, in which a hollow steel rod 22 is inserted into a steel rod fixing hole 12 drilled and formed in the lower end surface 11b of the wooden pillar 11, which is a wooden member, and a filling and solidifying agent 14 is filled into the steel rod fixing hole 12 via the inserted hollow steel rod 22 and allowed to solidify, thereby joining the members (the wooden pillar 11 and the reinforced concrete slab 30).

[0039] That is, in this embodiment, the method of joining wooden members to a concrete surface by the GIR method includes a fixing hole drilling step of drilling and forming a plurality of steel rod fixing holes 12 for inserting and fixing hollow steel rods 22 into the lower end surface 11b of the wooden column 11, which is the joining end surface of the wooden member, and a metal base plate 20 having a planar shape slightly larger than the lower end surface 11b of the wooden column 11, which is the joining end surface of the wooden member, and a fixing hole drilling step of drilling and forming a plurality of steel rod fixing holes 12 for inserting and fixing hollow steel rods 22 into the lower end surface 11b of the wooden column 11. A steel rod fixing process is performed in which a plurality of hollow steel rods 22 are fixed at positions corresponding to the holes 12 with the open end face 22a of one end facing the one surface 20a and the open end face 22b of the other end standing upright from the other surface 20b. The base plate 20 with the hollow steel rods 22 standing upright is inserted into the steel rod fixing holes 12, and the other surface 20b is brought into close contact with the lower end surface 11b of the wooden column 11, which is the joint end surface of the wooden member. In this state, a filling and hardening agent 14 is injected into each of the plurality of steel rod fixing holes 12 through a hollow steel rod 22 from the open end face 20a of one end facing one surface 20a, thereby fixing the base plate 20 integrally to the lower end face 11b of the wooden column 11, which is the joining end face of the wooden member; and then, a wooden member joining process is performed in which the base plate 20, which has been fixed integrally to the lower end face 11b of the wooden column 11, which is the joining end face of the wooden member, is joined to the joining surface, which is the concrete surface 30a, for example, the upper surface of a reinforced concrete slab 30, via joining means 28 provided on the part of the base plate 20 protruding from the lower end face 11b of the wooden column 11, which is the joining end face of the wooden member, thereby joining the wooden column 11, which is the wooden member, integrally to the concrete surface 30a.

[0040] In addition, the method of joining wooden members to a concrete surface can be such that the joining means 28 provided on the portion of the base plate 20 that protrudes from the lower end surface 11b of the wooden column 11, which is the joining end surface of the wooden member, is the above-mentioned plurality of bolt fastening holes 21, which are preferably formed in the protruding portion and which fix anchor bolts 31 that are embedded and erected from the concrete surface 30a formed by the upper surface of the reinforced concrete slab 30.

[0041] Furthermore, in the method of joining wooden members to a concrete surface, the above-mentioned fastening hole drilling process, steel rod fixing process, and base plate integration process are preferably carried out at a manufacturing factory for the wooden member, the wooden pillar 11, and the wooden member joining process is carried out at a construction site to which the wooden member, the wooden pillar 11, to which the base plate 20 is fixed, has been transported.

[0042] Furthermore, the joint structure 10 of the erected lower end of the wooden pillar of this embodiment, which has the above-mentioned configuration, to the concrete surface, makes it easier to erect and join the wooden pillar 11 to the concrete surface 30a at the construction site, and also makes it possible to firmly and stably fix the hollow steel rod 22 inside the steel rod fixing hole 12.

[0043] That is, according to this embodiment, the joint structure 10 for a concrete surface is configured to include a metal base plate 20 having a plurality of steel rod fixing holes 12 drilled and extending in the axial direction from the lower end surface 11b of the wooden column 11, and bolt fastening holes 21 for fastening anchor bolts 31, and having a plurality of hollow steel rods 22 erected thereon, which are inserted and fastened to the steel rod fixing holes 12 of the wooden column 11, respectively. The multiple tapped holes 24 of the base plate 20 are set and formed in a positional relationship that allows their respective center positions to be aligned so that a gap of a predetermined width is maintained around the entire circumference between the inner surface of the steel rod fixing hole 12 and the inserted hollow steel rod 22, and in each steel rod fixing hole 12, the filling solidification agent 14 injected through the hollow steel rod 22 fills the gap between the inserted hollow steel rod 22 and the entire circumference of the hollow steel rod 22 and solidifies.

[0044] As a result, according to the joint structure 10 of this embodiment, it is possible to firmly fix the hollow steel rod 22 inside the steel rod fixing hole 12 in a stable state, and the work of drilling multiple steel rod fixing holes 12 at the upright lower end of the wooden pillar 11, attaching the base plate 20, and filling the steel rod fixing holes 12 with filling and hardening agent via the inserted hollow steel rods 22 can be carried out in advance at a factory or the like before the wooden pillar 11 is transported to the construction site.Therefore, at the construction site, it is mainly necessary to erect the transported wooden pillar 11 at the designated joint point on the concrete surface 30a and tighten the anchor bolt 31 to the base plate 20, which makes it possible to smoothly and easily perform the work of erecting and joining the wooden pillar to the concrete surface at the construction site.

[0045] The present invention is not limited to the above-described embodiment and various modifications are possible. For example, the wooden post does not necessarily have to have a rectangular cross-sectional shape, and may have various other cross-sectional shapes, such as a circular shape or a polygonal shape. The base plate may have various other planar shapes, such as a circular shape or a polygonal shape, that are slightly larger than the cross-sectional shape of the wooden post. The positioning fitting hole and the positioning protrusion may have various other cross-sectional shapes, such as a rectangular shape or a polygonal shape, other than a circular cross-sectional shape. [Explanation of symbols]

[0046] 10 Joint structure of the lower end of a wooden pillar to the concrete surface 11 Wooden pillars (wooden components) 11a Standing bottom end 11b Bottom end surface 12 Steel bar fixing hole 13 Positioning fitting hole 14 Filling solidifier 20 base plate 21 Bolt fastening hole 22 hollow steel rod 22a One end opening 22b Other end opening 23 Positioning protrusion 23a Circular mounting hole 24 tapped holes 25 screw holes 26 Fixing screw 27 Gap-filling adhesive 28 Joining means 30 Reinforced concrete slab 30a Concrete surface (top of slab) 31 Anchor bolt 32 Level adjustment machine 33 Filling and solidification material

Claims

1. A structure for attaching a wooden pole by erecting it from a concrete surface on which an anchor bolt is arranged, the structure being provided at the erect lower end of the wooden pole and connecting the erect lower end of the wooden pole to the concrete surface, The wooden post has a plurality of steel rod fixing holes drilled and extending in the axial direction from the lower end surface thereof, and bolt fastening holes for fastening the anchor bolts. The wooden post has a plurality of hollow steel rods erected thereon, the hollow steel rods being inserted and fastened to the steel rod fixing holes of the wooden post. A positioning hole is formed on the lower end surface of the wooden post, and a positioning protrusion is provided on the base plate to be fitted into the positioning hole and prevent the base plate from being displaced relative to the lower end surface of the wooden post, The base plate is provided with a plurality of tap holes into which the hollow steel rods are screwed, with one end opening facing the underside of the base plate and the other end opening standing upright from the base plate; The plurality of steel rod fixing holes and the plurality of tapped holes are formed and set in a positional relationship that allows their respective center positions to be aligned so that, when the positioning protrusions are fitted into the positioning fitting holes and the base plate is in close contact with the lower end surface of the wooden post, and when the plurality of hollow steel rods erected from the tapped holes are inserted into the steel rod fixing holes, respectively, a gap of a predetermined width is maintained over the entire circumference between the inner surface of the steel rod fixing hole and the hollow steel rod, In each of the steel rod fixing holes, the gap between the inserted hollow steel rod is filled with a filling and hardening agent injected through the hollow steel rod and hardened, thereby forming a joint structure for the upright lower end of the wooden pillar to the concrete surface, in which the base plate to which the hollow steel rod is attached is fixed as a single unit to the upright lower end of the wooden pillar.

2. the wooden post has a rectangular cross-sectional shape, and the metal base plate has a rectangular planar shape that is slightly larger than the rectangular cross-sectional shape of the wooden post; 2. A joint structure for a lower end of a wooden post to a concrete surface according to claim 1, wherein the base plate has a plurality of tapped holes arranged in a rectangular ring, each corresponding to the position of the plurality of steel rod fixing holes drilled in the wooden post, and the positioning protrusion is provided in the inner area surrounded by the plurality of tapped holes arranged in a rectangular ring, corresponding to the position of the positioning fitting hole in the wooden post, and the bolt fastening hole for fastening the anchor bolt is formed in the outer area of ​​the plurality of tapped holes arranged in a rectangular ring.

3. The joint structure of the upright lower end of a wooden pillar to a concrete surface as described in claim 2, wherein the positioning fitting hole is a fitting hole with a circular cross-sectional shape formed in the center portion of the lower end surface of the wooden pillar, and the positioning protrusion is a protrusion with a circular cross-sectional shape protruding from the center portion of the inner area surrounded by the multiple tapped holes arranged in a rectangular ring shape.

4. A joint structure for the upright lower end of a wooden pillar to a concrete surface as described in claim 2 or 3, wherein a plurality of screw holes are formed in the inner area of ​​the base plate surrounded by the plurality of tap holes, and screws or nails are driven through these screw holes toward the lower end surface of the wooden pillar.

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