Joint structure

Abstract

To provide a junction structure capable of anchoring a steel rod effectively and reducing an anchorage length.SOLUTION: A junction structure 1 joints a beam 2 and a wall 3. In the junction structure 1, a steel rod 4 projecting from the beam 2 is situated in a hole 31 formed from a surface at the beam 2 side of the wall 3 and a filling material 5 is filled in the hole 31. A width of the hole 31 enlarges from a tip side to an opening side of the hole 31. The wall 3 is formed by arranging two wooden plates 30 so that the plate surfaces face each other and the hole 31 is formed by joining grooves formed at these wooden plates 30.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a joining structure between structural members and the like.

Background Art

[0002] In GIR (Glued-in Rod) joining, as shown in FIG. 10, a steel bar 104 is inserted into a hole 103 formed in a wood material 102, and an adhesive 105 such as an epoxy resin is filled into the hole 103, so that the steel bar 104 is fixed to the wood material 102.

[0003] In order to increase the fixing strength of the steel bar 104, one effective method is to increase the fixing length of the steel bar 104. In addition, as shown in FIG. 9 of Patent Document 1, it is described that unevenness is provided on the inner surface of the hole 103. By doing so, in addition to the adhesive force of the adhesive 105, a bearing pressure is exerted, and it is also possible to increase the fixing strength of the steel bar 104.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When a pulling force acts on the steel bar 104, the displacement (elongation) of the steel bar 104 becomes large near the opening of the hole 103, and the adhesive stress generated in the adhesive 105 becomes larger as it approaches the opening of the hole 103 and smaller toward the tip. Therefore, adhesive failure of the adhesive 105 occurs on the opening side of the hole 103 where the adhesive stress is large, and this failure propagates to the tip side of the hole 103, causing the steel bar 104 to be pulled out from the wood material 102. As a result, even if the fixing length of the steel bar 104 is increased, a certain length portion on the tip side does not contribute to the improvement of the strength, and there is a drawback of low efficiency.

[0006] In addition, if an attempt is made to increase the fixing length of the steel bar 104 in the GIR joint, there are also problems such as the length of the hole 103 being limited by the length of the drilling tool used for drilling the hole 103, it being difficult to ensure the vertical accuracy of the hole 103, and the workability deteriorating when inserting the steel bar 104 into the hole 103. The method described in Patent Document 1 is also difficult to drill the hole 103 because the hole 103 has irregularities.

[0007] The present invention has been made in view of the above problems, and an object thereof is to provide a joining structure or the like that can efficiently fix a steel bar and reduce the fixing length.

Means for Solving the Problems

[0008] A first invention for achieving the above-described object is a joining structure between two structural members, wherein a steel bar protruding from one structural member is A wall made of wood positioned in a hole formed from the surface of the other structural member on the side of the one structural member, and the hole is filled with a filler, Only one of the steel bars is disposed in one of the holes, and no other steel bars are present. and the hole is characterized in that it widens from the tip side of the hole toward the opening side Continuously in two directions, the out-of-plane direction and the in-plane direction is a joining structure. A second invention is a joining structure between two structural members, wherein a steel bar protruding from one structural member is A wall made of wood positioned in a hole formed from the surface of the other structural member on the side of the one structural member, and the hole is filled with a filler, Only one of the steel bars is disposed in one of the holes, and no other steel bars are present. and among the fillers, the shear rigidity of the first filler located on the opening side of the hole is lower than the shear rigidity of the second filler located on the tip side of the hole Well, the first filler is provided only around the steel bar, and the second filler is filled between the first filler and the inner surface of the hole. is a joining structure characterized by this.

[0009] In the first invention, as the hole widens from the tip side toward the opening side, the thickness of the filling material in the hole also increases from the tip side to the opening side of the hole. Since the shear rigidity of the filling material decreases as the filling material becomes thicker, the adhesion stress (shearing stress) of the filling material when a pulling force acts on the steel bar can be decreased on the opening side of the hole and increased on the tip side as compared with the case where the cross section of the hole is constant as shown in FIG. 10. As a result, the adhesion stress can be made uniform over the entire length of the steel bar, adhesion failure on the opening side of the hole can be suppressed, and adhesion stress on the tip side can also be generated. Therefore, the fixing of the steel bar can be efficiently performed, the fixing length of the steel bar can be made smaller, and the construction becomes easier. Also in the second invention, by making the shear rigidity of the filling material in the hole low on the opening side and high on the tip side, the same effect as described above can be obtained.

[0013] Furthermore, in the first and second inventions, it is also desirable that the other structural member is formed by arranging a plurality of members so that their surfaces face each other, grooves are formed on the opposing surfaces of the plurality of members, and the hole is formed by combining the grooves. Thereby, the grooves of each member can be easily machined with high precision so that a predetermined hole is formed.

Advantages of the Invention

[0014] According to the present invention, it is possible to provide a joining structure or the like that can efficiently perform the fixing of a steel bar and reduce the fixing length.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0017] [First Embodiment] (1. Joining Structure) FIG. 1 is a view showing a joining structure 1 according to a first embodiment of the present invention. The joining structure 1 joins a beam 2 and a wall 3. FIG. 1(a) is a cross-sectional view in the thickness direction of the wall 3, and FIG. 1(b) is a cross-sectional view in the horizontal direction of the wall 3. FIG. 1(a) shows a cross-section taken along line B - B of FIG. 1(b), and FIG. 1(b) shows a cross-section taken along line A - A of FIG. 1(a).

[0018] The beam 2 is a structural member such as a wooden structure or an RC (reinforced concrete) structure.

[0019] The wall 3 is a structural member formed of a wood material and is formed by arranging two wood plates 30 such that their plate surfaces face each other. The wood plate 30 is a plate-like member formed of a wood material such as CLT (Cross Laminated Timber) or LVL (Laminated Veneer Lumber), but the wood material is not limited thereto.

[0020] In the joining structure 1, a steel bar 4 such as a reinforcing bar embedded in the beam 2 protrudes toward the wall 3 side, and the protruding portion is disposed in a hole 31 formed in the wall 3. The hole 31 extends from the surface of the wall 3 on the beam 2 side toward the inside of the wall 3, and an opening of the hole 31 is formed on the surface. The cross-section of the hole 31 (referring to the cross-section perpendicular to the extending direction of the hole 31. The same applies hereinafter) is circular, and the steel bar 4 is located at the center of the cross-section of the hole 31. The diameter of the steel bar 4 is substantially constant over the entire length within the hole 31.

[0021] The hole 31 is filled with a filler 5. The filler 5 may be an adhesive such as an epoxy resin, a grout material such as mortar, etc., but is not limited thereto. Injection holes and air vent holes (not shown) for the filler 5 are provided in advance in the wooden board 30 forming the wall 3, and the filler 5 is injected into the hole 31 through the injection holes. In addition, mortar 6 is provided in the gap between the beam 2 and the wall 3.

[0022] FIG. 2 is a perspective view showing the three-dimensional shape of the hole 31 in the wall 3. As shown in FIG. 2, the hole 31 continuously widens from the tip side to the opening side with respect to two directions, namely, the out-of-plane direction and the in-plane direction of the wall 3. The out-of-plane direction corresponds to the left-right direction in FIG. 2, and the in-plane direction corresponds to the depth direction in FIG. 2. The out-of-plane direction and the in-plane direction are orthogonal in the plane.

[0023] FIG. 3(a) shows a cross-section in the thickness direction of two wooden boards 30 forming the wall 3. Grooves 311 are formed on the opposing surfaces of these wooden boards 30. The hole 31 is formed by combining the grooves 311 on both opposing surfaces when the opposing surfaces of the two wooden boards 30 are overlapped as shown by the arrow in FIG. 3(a).

[0024] The groove 311 can be formed by cutting the wooden board 30 using a cutting tool 8 as shown in FIG. 3(b). By moving the cutting tool 8 in the in-plane direction or the thickness direction of the wooden board 30, the widened shape of the groove 311 can be accurately processed, and thereby the widened shape of the hole 31 described above can be realized.

[0025] In this embodiment, due to the widened shape of the hole 31, when a pulling force acts on the steel bar 4, the adhesion stress of the filler 5 is made uniform over the entire length of the steel bar 4 in the hole 31, and the fixing of the steel bar 4 is efficiently performed, so that the fixing length of the steel bar 4 can be reduced.

[0026] That is, the adhesive or grout material used as the filling material 5 generally has the property that the shear rigidity decreases as the layer thickness increases. In the joint structure 1, since the diameter of the steel bar 4 is constant and the hole 31 widens from the tip side toward the opening side, the filling material 5 becomes thicker from the tip side to the opening side of the hole 31, and the shear rigidity gradually decreases.

[0027] When a pulling force acts on the steel bar 4, the displacement of the steel bar 4 becomes larger on the opening side of the hole 31. However, on the opening side of the hole 31, the filling material 5 is thick and the shear rigidity is relatively low, so the adhesion stress (shear stress) of the filling material 5 becomes small. On the other hand, on the tip side of the hole 31, although the displacement of the steel bar 4 is small, the filling material 5 is thin and the shear rigidity is relatively high, so the adhesion stress of the filling material 5 becomes large.

[0028] As a result, the adhesion stress generated in the filling material 5 when the steel bar 4 is pulled out is made uniform over the entire length of the steel bar 4 in the hole 31 as shown in the right graph of FIG. 4, and the adhesion failure as described above does not occur on the opening side of the hole 31, and the pulling force is also borne on the tip side of the hole 31. In the conventional GIR joint, the adhesion force and the pulling force obtained by the area of the triangle in the right graph of FIG. 10(a) are balanced, whereas in the joint structure 1 of the present embodiment, the adhesion force and the pulling force obtained by the area of the rectangle in the right graph of FIG. 4 are balanced, and the fixing strength of the steel bar 4 is improved.

[0029] As described above, in the joint structure 1 of the present embodiment, since the hole 31 widens from the tip side toward the opening side, the thickness of the filling material 5 in the hole 31 also increases from the tip side to the opening side of the hole 31. Since the shear rigidity of the filling material 5 decreases as the filling material 5 becomes thicker, the adhesion stress (shear stress) of the filling material 5 when a pulling force acts on the steel bar 4 can be decreased on the opening side of the hole 31 and increased on the tip side as compared with the case where the cross section of the hole 103 is constant as shown in FIG. 10. As a result, the adhesion stress can be made uniform over the entire length of the steel bar 4, adhesion failure on the opening side of the hole 31 can be suppressed, and an adhesion stress can be generated on the tip side. Therefore, the fixing of the steel bar 4 can be efficiently performed, the fixing length of the steel bar 4 can be made smaller, and the construction becomes easier.

[0030] In addition, in this embodiment, the wall 3 is formed by using a plurality of wooden plates 30, and the holes 31 are formed by combining the grooves 311 formed in each wooden plate 30. Therefore, the grooves 311 of each wooden plate 30 can be easily processed with high precision so that the predetermined holes 31 are formed. Further, in this embodiment, in the GIR joint for the wall 3 made of wood material, the steel bars 4 can be efficiently fixed, and the fixing length of the steel bars 4 can be shortened.

[0031] However, the present invention is not limited to the above embodiments. For example, as shown in FIG. 5, in the vicinity of the opening of the hole 31, an adhesion removal portion 9 may be provided around the steel bar 4 to avoid adhesion to the filling material 5. The adhesion removal portion 9 can be formed, for example, by winding a strip material such as a thick tape around the steel bar 4 in advance or applying clay. By providing the adhesion removal portion 9, when the steel bar 4 yields, a section where the steel bar 4 extends following the deformation of the wall 3 or the like can be secured, and brittle fracture of the steel bar 4 can be prevented.

[0032] Further, by appropriately setting the shape and moving direction of the cutting tool 8, the cross-section of the hole 31 can be made into a shape other than a circle, and the hole 31 in which only one of the out-of-plane direction and the in-plane direction of the wall 3 expands and the other does not expand can also be formed. FIG. 6 shows an example in the same manner as FIG. 2 of the hole 31 that expands only in the out-of-plane direction of the wall 3. In this case, there is an advantage that it is easy to secure the interval of the steel bars 4 in the in-plane direction, and it becomes easy to arrange the steel bars 4 densely in the in-plane direction. Also, the processing of the hole 31 (groove 311) becomes easier.

[0033] In this embodiment, the wall 3 is formed by overlapping a plurality of wooden plates 30, but the wall 3 may be formed by overlapping a plurality of precast concrete plates. Further, the wall 3 may be formed of a single wooden material or a precast member made of concrete, and the holes 31 can be formed by drilling the wooden material or the precast member. Also in this case, the hole 31 that expands toward the opening side can be processed relatively easily.

[0034] Also, as exemplified in the joining structure 1a of FIG. 7, the hole 31 may be widened stepwise toward the opening side. Thereby, the hole 31 can be easily processed using a general processing tool. For example, when a plurality of wooden plates 30 are stacked to form the wall 3, the groove 311 is cut stepwise by changing the cutting width and cutting depth of the cutting tool 8, and the holes 31 are formed by overlapping the grooves 311 of the wooden plates 30. Also, when drilling a hole in a wooden material or a precast member, a hole 31 that widens stepwise can be easily formed by drilling the hole in multiple steps using hole drilling tools with different hole diameters.

[0035] In this embodiment, the wall 3 is located above the beam 2. However, even when the wall 3 is located below the beam 2, joining can be performed using a joining structure similar to the joining structure 1 etc. in FIG. 1 (with the joining structure 1 etc. inverted upside down). Also, in this embodiment, the two structural members joined by the joining structure 1 are the beam 2 and the wall 3. However, the combination of the structural members to be joined is not limited to this, and the steel bar 4 protruding from one structural member can be inserted into the hole 31 formed in the other structural member, and it can be generally applied to the entire structure. Examples include between columns, between beams, between a column and a beam, between a beam and a slab, between slabs, between walls, and between a column and a wall. In any case, the structural member having the hole 31 can be formed by combining a plurality of members, and the hole 31 can be formed by combining the grooves 311 formed in each member.

[0036] Next, another example of the present invention will be described as a second embodiment. The differences between the second embodiment and the first embodiment will be described, and the description of the same configurations will be omitted by using the same reference numerals in the drawings etc. Also, the configurations described in the second embodiment can be combined with the configurations described in the first embodiment as necessary.

[0037] [Second Embodiment] FIG. 8 is a diagram showing a joining structure 10 according to the second embodiment of the present invention. The joining structure 10 is different from the first embodiment in that the cross-section of the hole 31a does not change from the tip side to the opening side, and different filling materials 5a and 5b are provided on the opening side and the tip side of the hole 31a.

[0038] The filling materials 5a and 5b are different especially in terms of shear rigidity. The filling material 5a (the first filling material) on the opening side of the hole 31a has a relatively lower shear rigidity than the filling material 5b (the second filling material) on the tip side. The filling material 5a is, for example, mortar or urethane, etc., and the filling material 5b is an adhesive such as epoxy resin, etc. However, the filling materials 5a and 5b are not limited to this, as long as the shear rigidity of the filling material 5a is lower than that of the filling material 5b.

[0039] First, the hole 31a is filled with the filling material 5a, and then, the filling material 5b is filled above the filling material 5a. The wall 3 is provided with injection holes and air vent holes (not shown) for each of the filling materials 5a and 5b, and the filling materials 5a and 5b are injected into the hole 31a from their respective injection holes.

[0040] Also in the joining structure 10 of the second embodiment, by filling the filling material 5a with low shear rigidity on the opening side of the hole 31a and the filling material 5b with high shear rigidity on the tip side of the hole 31a, the same effect as in the first embodiment can be obtained, and the adhesive stress generated in the filling materials 5a and 5b when a pulling force acts on the steel bar 4 can be reduced on the opening side of the hole 31a and increased on the tip side. As a result, the adhesive stress can be made uniform over the entire length of the steel bar 4, and by efficiently fixing the steel bar 4, the fixing length of the steel bar 4 can be reduced.

[0041] In this embodiment, the wall 3 is located above the beam 2. However, even when the wall 3 is located below the beam 2, joining can be performed with a joining structure similar to the joining structure 10 in Fig. 8 (with the joining structure 10 inverted vertically). In this case, first, the hole 31a is filled with the filling material 5b, and then, the filling material 5a is filled above the filling material 5b. Also, the width shape of the hole 31 described in the first embodiment can be applied in the second embodiment.

[0042] In addition, in this embodiment, the filler 5a fills the entire cross-section of the hole 31a. However, as shown in the joining structure 10a of FIG. 9, the filler 5a may be provided only around the steel bar 4 instead of the entire cross-section of the hole 31a, and the filler 5b may be filled in the remaining portion including the space between the filler 5a and the inner surface of the hole 31a. In this case, for example, with the filler 5a such as urethane provided around the steel bar 4 in advance, the steel bar 4 can be inserted into the hole 31a, and then the filler 5b can be filled into the hole 31a.

[0043] Also in this case, since the filler 5a with low shear rigidity exists on the opening side of the hole 31a, the same effects as described above can be obtained. Further, the injection hole and the air vent hole (not shown) may be provided only for the filler 5b, and since the filling work can be completed in one operation, the construction becomes easy.

[0044] As described above, the preferred embodiments according to the present invention have been described with reference to the accompanying drawings. However, the present invention is not limited to such examples. It is obvious that those skilled in the art can conceive of various modification examples or correction examples within the scope of the technical idea disclosed in the present application, and it is naturally understood that those also belong to the technical scope of the present invention.

Explanation of Reference Numerals

[0045] 1, 1a, 10, 10a: Joining structure 2: Beam 3: Wall 4: Steel bar 5, 5a, 5b: Filler 30: Wood board 31, 31a: Hole 311: Groove

Claims

1. A joining structure between two structural members, wherein a steel bar protruding from one structural member is positioned within a hole formed from the surface of the other structural member, which is a wall made of a wood material, on the side of the one structural member, and the hole is filled with a filling material, only one of the steel bars is disposed within one of the holes, and no other steel bars are present, and the hole continuously widens in two directions, an out-of-plane direction and an in-plane direction, from the tip side of the hole toward the opening side. The joining structure is characterized by this.

2. A joining structure between two structural members, wherein a steel bar protruding from one structural member is positioned within a hole formed from the surface of the other structural member, which is a wall made of a wood material, on the side of the one structural member, and the hole is filled with a filling material, only one of the steel bars is disposed within one of the holes, and no other steel bars are present, among the filling materials, the shear rigidity of a first filling material positioned on the opening side of the hole is lower than the shear rigidity of a second filling material positioned on the tip side of the hole, the first filling material is provided only around the steel bar, and the second filling material is filled between the first filling material and the inner surface of the hole The joining structure is characterized by this.

3. the other structural member is formed by arranging a plurality of members such that their surfaces face each other, grooves are formed on the opposing surfaces of the plurality of members, The joining structure according to claim 1 or claim 2, wherein the hole is formed by combining the grooves.

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