Contact member and method for installing the contact member

Abstract

In a contact member inserted between two beveled surfaces, contact can be easily confirmed. [Solution] The contact member comprises a tapered main body, an arm, a through-tapped hole, and a bolt, and the thickness T1 of the arm, the thickness T2 of the main body, the distance E from the through-tapped hole to the tip of the arm, the distance B1 from the first contact surface to the tip of the arm, and the effective width W are such that the yield stress σ of the steel material y , the axial yield strength P of the bolt by , yield strength P of the threaded portion of the through-tapped hole and bolt bt In relation to the coefficient m (m=6 or m=4), the following equations (i) to (iii) are satisfied. TIFF2026081691000011.tif66170

Description

Technical Field

[0001] The present invention relates to a contact member and a method for constructing the contact member.

Background Art

[0002] For example, beam end joints between an RC beam or wall and a main beam, or between a main beam and a secondary beam are generally designed as rigid joints or pin joints. Taking the example of a main beam and a secondary beam, in the case of a rigid joint, the flange of the secondary beam is welded or bolted to the main beam, and further, the web of the secondary beam is bolted to the main beam. In the case of a pin joint, the web of the secondary beam is bolted to a shear plate attached to the main beam, and the flange of the secondary beam is not joined to the main beam.

[0003] On the other hand, Non-Patent Document 1 describes a semi-rigid joint using a contact plate under load conditions where the moment at the joint does not reverse, such as a gravity frame that does not bear horizontal forces or a moment frame when the horizontal force is small and does not result in antisymmetric bending. The contact plate is inserted into the gap between the end face of the lower flange of the steel beam and the support member, and transmits the force of the compression-side flange of the steel beam to the opposing support member.

[0004] However, generally, the dimension of the gap between the end face of the lower flange of the steel beam and the support member varies due to variations in construction accuracy and the like. In this case, if the thickness of the contact plate does not correspond to the dimension of the gap, the force cannot be transmitted, so it is necessary to make the thickness of the contact plate variable. Therefore, a technique has been proposed that accommodates dimensional variations in the gap by inserting a contact member including a tapered portion into the gap between the steel member and the support member. Specifically, Patent Documents 1 and 2 describe a contact member that can be mechanically fixed by sandwiching a steel beam or a support member between a bolt inserted through an arm portion formed on the tip side of the tapered shape and an inclined contact surface.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Non-Patent Documents

[0006]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] In the joint structure using the contact member as described above, it is not easy to confirm that the contact member and the surfaces of the steel beam or the support member are in reliable contact. Even if the tip of the bolt contacts the steel beam or the support member, there may be a play between the contact member and the surfaces of the steel beam or the support member. Also, since the surfaces of each member are not completely smooth surfaces, even when the compression force can be transmitted by contact, there may be gaps in some parts, and it is not always possible to determine the contact state based on the presence or absence of gaps.

[0008] Therefore, an object of the present invention is to provide a contact member and a construction method of the contact member that can easily confirm contact in a contact member inserted between an inclined surface and a surface facing the inclined surface.

Means for Solving the Problems

[0009] [1] A contact member interposed between an angled surface and a surface opposite to the angled surface, comprising: a tapered main body formed by a first contact surface and a second contact surface that forms an angle with respect to the first contact surface corresponding to the angle of the angled surface; an arm portion protruding from the tip side of the tapered shape where the distance between the first contact surface and the second contact surface narrows in the main body portion, and having a through tap hole formed therein; and a bolt inserted through and screwed into the through tap hole, wherein the cross-sectional shape of the main body portion and the arm portion is such that the thickness T1 of the arm portion at the connection portion with the main body portion, the thickness T2 of the main body portion at the connection portion with the arm portion, the distance E from the center of the through tap hole to the tip of the arm portion on the opposite side of the main body portion, the distance B1 from the first contact surface to the tip of the arm portion, and the effective width W of the main body portion and the arm portion per bolt are equal to the yield stress σ of the steel material forming the main body portion and the arm portion. y , the axial yield strength P of the bolt by , the yield strength P of the through-tap hole and the threaded portion of the bolt bt A contact member that satisfies the following equations (i) to (iii) in relation to the coefficient m (m=6 or m=4). TIFF2026081691000002.tif66170[2] A contact member according to [1], wherein a constricted portion is formed in the arm portion at the connection portion with the main body portion, and the thickness T1 of the arm portion at the constricted portion is smaller than the thickness T2 of the main body portion. [3] The contact member according to [1], wherein the connection portion between the main body and the arm is formed to be the narrowest. A method for installing a contact member according to any one of items [4], [1] to [3], comprising the steps of: inserting the main body into the gap formed between the surface of a first member and the beveled surface formed at the end of a plate-like portion of a second member facing the surface of the first member; bringing the tip of the bolt, which is inserted through and screwed into the through-tap hole, into contact with a surface of the plate-like portion other than the beveled surface; and tightening the bolt to deform the arm relative to the main body, in this order. [5] Torque T when tightening the bolt rqThe thickness T1, the thickness T2, the distance E, the distance B1, the effective width W, and the yield stress σ are all factors. y A method for constructing a contact member according to [4], which satisfies the following equations (iv) and (v) in relation to the coefficient m, torque coefficient k, and the nominal diameter D of the bolt. TIFF2026081691000003.tif33170[6] A method for constructing a contact member according to [4], further comprising the steps of applying paint to the connection portion between the main body and the arm, and confirming that the arm has deformed relative to the main body by observing the change in the paint. [Effects of the Invention]

[0010] With the above configuration, the arms of the contact member can be deformed relative to the main body by tightening the bolts. By deforming the arms, it is easy to confirm that the contact member and the members on both sides are in secure contact, that is, in a state where compressive force can be transmitted. [Brief explanation of the drawing]

[0011] [Figure 1] This figure shows an example of a joining structure including a contact member according to an embodiment of the present invention. [Figure 2] This figure shows another example of a joining structure including a contact member according to an embodiment of the present invention. [Figure 3] This figure shows yet another example of a joining structure including a contact member according to an embodiment of the present invention. [Figure 4] This figure shows yet another example of a joining structure including a contact member according to an embodiment of the present invention. [Figure 5] This figure shows yet another example of a joining structure including a contact member according to an embodiment of the present invention. [Figure 6] This figure illustrates an example of a method for joining members using a contact member in an embodiment of the present invention. [Figure 7] This figure illustrates the design concept of a contact member according to an embodiment of the present invention. [Figure 8]This figure illustrates the conditions under which deformation occurs in the arm portion of the contact member shown in Figure 7. [Figure 9] This figure shows a modified example of a contact member according to an embodiment of the present invention. [Figure 10] This figure shows a modified example of a contact member according to an embodiment of the present invention. [Figure 11] This figure shows a modified example of a contact member according to an embodiment of the present invention. [Figure 12] This figure shows a modified example of a contact member according to an embodiment of the present invention. [Modes for carrying out the invention]

[0012] Preferred embodiments of this disclosure will be described in detail below with reference to the attached drawings. In this specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant descriptions will be omitted.

[0013] Figure 1 shows an example of a joint structure including a contact member according to an embodiment of the present invention. The joint structure shown in Figure 1 includes a secondary beam 1, a main beam 2, a fin plate 31, a rib 32, a contact member 4, an RC floor slab 5, and a shear connector 6. More specifically, the secondary beam 1 is an H-shaped beam including an upper flange 11, a lower flange 12, and a web 13. The main beam 2 is an H-shaped beam extending in a direction perpendicular to the material axis direction of the secondary beam 1 and including an upper flange 21, a lower flange 22, and a web 23. A pair of secondary beams 1 are arranged on both sides of the main beam 2. The RC floor slab 5 includes concrete 51, reinforcing bars 52 embedded in the concrete 51 and extending at least in the material axis direction of the secondary beam 1, and a deck plate 53.

[0014] The above-described joint structure is formed between the steel frame member, the secondary beam 1, and the supporting members, the main beam 2, the fin plate 31, and the rib 32. Specifically, the fin plate 31 is a plate-shaped member perpendicular to the main beam 2, positioned on both sides of the web 23 and welded to the upper flange 21 and the web 23. The rib 32 is a plate-shaped member parallel to the upper flange 21 and lower flange 22 of the main beam 2, and is welded to the web 23 and the fin plate 31. The end face 32E of the rib 32 intersects the axial direction of the secondary beam 1 and constitutes a supporting surface facing the end face 12E of the lower flange 12. In the illustrated example, the end face 32E of the rib 32 is a downward-facing oblique angled surface, and the end face 12E of the lower flange 12 is a vertical surface, so the end face 12E faces the end face 32E at an angle.

[0015] The contact member 4 is interposed in the gap between the end face 12E of the lower flange 12 and the end face 32E of the rib 32, and contacts the end face 12E and the end face 32E, respectively. Since the contact member 4 has a tapered main body portion 41, even if the size of the gap between the end face 32E and the end face 12E fluctuates due to, for example, construction errors, the contact can be maintained by moving the contact member 4 in the vertical direction. Furthermore, the contact member 4 has an arm portion 42 that protrudes from the tapered tip side of the main body portion 41 and is positioned opposite the upper surface 32U of the rib 32. A through tapped hole is formed in the arm portion 42. The contact member 4 further includes a bolt 43 that is inserted through and screwed into the through tapped hole, and when the beam 1 is joined, the tip of the bolt 43 inserted through and screwed into the through tapped hole is brought into contact with a surface of the rib 32 other than the end face 32E, specifically the upper surface 32U. By tightening the bolt 43, a reaction force is applied to the upper surface 32U of the rib 32, causing the tapered shape of the main body 41 to fit between the end face 32E and the end face 12E, thereby mechanically fixing the contact member 4. This allows the contact member 4 to be held in a predetermined position more stably, even without using welding.

[0016] The contact member 4 described above can be manufactured, for example, by extruding a member with an equal cross-sectional shape including a main body 41 and an arm 42, cutting it to a predetermined length, and then machining a through-tap hole in the arm 42. Alternatively, the member with an equal cross-sectional shape may be cut to a predetermined length after machining the through-tap hole. As will be described later, the contact member is not necessarily limited to being cut perpendicular to the equal cross-sectional shape. Furthermore, the contact member may include parts that do not have a tower cross-sectional shape. The contact member may be manufactured by other methods such as casting or cutting instead of extrusion molding, or in combination with extrusion molding.

[0017] In the illustrated example, the contact between the end face 12E of the lower flange 12 and the end face 32E of the rib 32 via the contact member 4 ensures reliable transmission of compressive force between the lower flange 12 and the rib 32. Furthermore, the web 13 of the secondary beam 1 is joined to the fin plate 31 using bolts 33, thereby transmitting compressive and shear forces between the web 13 and the fin plate 31. In addition, the secondary beam 1 is joined to the RC floor slab 5 via the shear connector 6, thereby transmitting compressive and tensile forces in the axial direction of the secondary beam 1 to the RC floor slab 5. As a result, the secondary beam 1, the main beam 2, and the RC floor slab can collectively resist the bending moment generated at the end of the secondary beam 1.

[0018] Figure 2 shows another example of a joint structure including a contact member according to an embodiment of the present invention. In the joint structure shown in Figure 2, the cross-sectional heights of the secondary beam 1 and the main beam 2 are the same. That is, in the illustrated example, the upper surface of the upper flange 11 of the secondary beam 1 and the upper surface of the upper flange 21 of the main beam 2 are at the same height in design, and the lower surface of the lower flange 12 of the secondary beam 1 and the lower surface of the lower flange 22 of the main beam 2 are at the same height in design. Note that the thicknesses of the upper flange 11 and lower flange 12 of the secondary beam 1 and the upper flange 21 and lower flange 22 of the main beam 2 may be different. In the illustrated example, the thickness of the upper flange 21 and lower flange 22 of the main beam 2 is greater. No ribs are provided, and the end face 12E1 of the lower flange 12 of the secondary beam 1 faces the side surface 22S of the lower flange 22 of the main beam 2. That is, in the example of Figure 2, the main beam 2 and the fin plate 31 constitute the support member. The side surface 22S of the lower flange 22 of the main beam 2 intersects with the material axis direction of the secondary beam 1 and forms a support surface facing the end surface 12E1 of the lower flange 12. In the illustrated example, the end surface 12E1 of the lower flange 12 of the secondary beam 1 is a downward-facing angled surface, and the side surface 22S of the lower flange 22 of the main beam 2 is a vertical surface, so the end surface 12E faces the side surface 22S at an angle. The contact member 4 is interposed between the end surface 12E1 and the side surface 22S and contacts the end surface 12E1 and the side surface 22S. In addition, the tip of the bolt 43, which is inserted through and screwed into the through-tapped hole of the contact member 4, is brought into contact with the upper surface 12U of the lower flange 12 of the secondary beam 1. The other configurations are the same as in the example in Figure 1.

[0019] Even in the example shown in Figure 2, compressive force can be reliably transmitted between the lower flange 12 of the secondary beam 1 and the lower flange 22 of the main beam 2 through contact between the end face 12E1 of the lower flange 12 of the secondary beam 1 and the side surface 22S of the lower flange 22 of the main beam 2 via the contact member 4. The effects of joining the web 13 of the secondary beam 1 and the fin plate 31 using bolts 33, and joining the secondary beam 1 to the RC floor slab 5 via shear connectors 6, are the same as in the example in Figure 1. As a result, even in the example in Figure 2, the secondary beam 1, the main beam 2, and the RC floor slab can collectively resist the bending moment generated at the end of the secondary beam 1.

[0020] In the examples shown in Figures 1 and 2, one of the surfaces on the steel member side (end faces 12E, 12E1 of the lower flange 12 of the secondary beam 1) and the surface on the support member side (end face 32E of the rib 32, or the side surface 22S of the lower flange 22 of the main beam 2) is an oblique surface and the other is a vertical surface, but this relationship may be reversed. In that case, the contact member 4 will be positioned inverted left to right compared to the illustrated example. Also, the oblique surface is not limited to facing downwards but may face upwards, in which case the contact member 4 will be positioned inverted up to down compared to the illustrated example. The two members constituting the joint structure are not necessarily limited to what are called a steel member and a support member. One of the two members has a plate-like portion (the lower flange 12 and rib 32 in the above example), and an oblique surface is formed at the end of that plate-like portion, but the other member does not have to be a plate-like portion, for example, as described below with reference to Figures 3 to 5.

[0021] Figure 3 shows yet another example of a joint structure including a contact member according to an embodiment of the present invention. In the joint structure shown in Figure 3, an RC beam 7, a base plate 81, and a fin plate 82 constitute a support member that supports a secondary beam 1. The RC beam 7 includes concrete 71 and reinforcing bars 72 embedded in the concrete 71. The reinforcing bars 72 include main reinforcement bars 72A and stirrups 72B that extend in a direction perpendicular to the secondary beam 1. The base plate 81 is joined to the RC beam 7 by anchoring anchors 84 joined to the base plate 81 into the concrete 71. The fin plate 82 is a plate-shaped member perpendicular to the RC beam 7 and the base plate 81, welded to the plate surface 81S of the base plate 81, and joined to the web 13 of the secondary beam 1 using bolts 83. In other examples, the web 13 of the secondary beam 1 may be welded to the base plate 81, and the fin plate 82 may not be provided.

[0022] In the example shown in Figure 3, the end face 12E1 of the lower flange 12 of the secondary beam 1 faces the plate surface 81S of the base plate 81 which is joined to the side surface of the RC beam 7. In this case, the plate surface 81S of the base plate 81 constitutes the support surface, and the contact member 4 is interposed between the end face 12E1 of the lower flange 12 and the plate surface 81S of the base plate 81. In the illustrated example, the end face 12E1 of the lower flange 12 is a downward-sloping surface, but it may also be an upward-sloping surface, as in the other examples already described. In the illustrated example, the tip of the bolt 43 inserted through the through hole of the contact member 4 is in contact with the upper surface of the lower flange 12, but in other examples it may be in contact with the lower surface of the lower flange 12. The RC floor slab 5 is positioned above the secondary beams 1 and RC beam 7. However, while the secondary beams 1 are joined to the RC floor slab 5 by shear connectors 6, the RC beam 7 is joined to the RC floor slab 5 by pouring concrete 71 with the reinforcing bars 72 exposed from above, and then pouring the concrete 51 of the RC floor slab 5 above to anchor the reinforcing bars 72 to the concrete 51. The rest of the configuration is the same as the example shown in Figure 1.

[0023] Figures 4 and 5 also show yet another example of a joint structure including a contact member according to an embodiment of the present invention. In the joint structure shown in Figure 4, the RC column 9A, base plate 81, and fin plate 82 constitute the support member. The base plate 81 and fin plate 82 are configured in the same way as the base plate 81 and fin plate 82 in the example described above with reference to Figure 3. Therefore, in the examples of Figures 4 and 5, the plate surface 81S of the base plate 81 constitutes the support surface, and the contact member 4 is interposed between the end face 12E1 of the lower flange 12 of the beam 1 and the plate surface 81S of the base plate 81, which is common to the example in Figure 3.

[0024] On the other hand, in the relationship between the RC column 9A and the RC floor slab 5, the reinforcing bars 52 of the RC floor slab 5 are anchored to the concrete of the RC column 9A, which constitutes the support member, via the extension portion 52E (starter bar). Specifically, for example, the extension portion 52E may protrude from the side of the RC column 9A, or a coupler may be provided at the side end of the extension portion 52E on the RC column 9A, with the fitting hole for the coupler exposed on the side, and then the concrete of the RC column 9A may be poured, after which the extension portion 52E and the reinforcing bars 52 are joined, and then the concrete 51 of the RC floor slab 5 may be poured. In this way, tensile force is transmitted from the end of the beam 1 to the RC floor slab 5, and the bending moment at the end of the beam 1 can be effectively transmitted to the RC column 9A by the couple with the compressive force transmitted by the contact member 4.

[0025] The joint structure shown in Figure 5 replaces the RC column 9A with an RC wall 9B, and the relationship between the support member, which is composed of the base plate 81 and fin plate 82, and the secondary beam 1 and contact member 4 is the same as in the example in Figure 4. Also, the relationship between the RC wall 9B and the RC floor slab 5 is the same as the relationship between the RC column 9A and the RC floor slab 5 described in the example in Figure 4.

[0026] Figure 6 is a diagram illustrating an example of a method for joining members using a contact member in an embodiment of the present invention. The joining structure is similar to that of the example in Figure 1, and the same applies to the examples from Figure 2 onward. First, as shown in Figure 6(a), the contact member 4 is inserted into the gap g between the beam 1 (steel frame member) and the rib 32 (support member) such that the first contact surface 41A faces the end face 12E of the lower flange 12, the second contact surface 41B faces the end face 32E of the rib 32, and the axis of the through tap hole 42A intersects the upper surface 32U of the rib 32. From this state, by moving the contact member 4 upward, that is, in a direction in which the tapered shape of the main body portion 41 fits between the end faces 12E and 32E, the first contact surface 41A of the contact member 4 can be brought into contact with the end face 12E of the lower flange 12, and the second contact surface 41B can be brought into contact with the end face 32E of the rib 32, as shown in Figure 6(b).

[0027] Since the arm portion 42 of the contact member 4 protrudes from the tapered tip side where the distance between the first contact surface 41A and the second contact surface 41B narrows in the main body portion 41 toward the second contact surface 41B side, when the contact member 4 is arranged as described above, the arm portion 42 extends along the upper surface 32U of the rib 32. Therefore, if the tip of the bolt 43 inserted and screwed into the through-tap hole 42A formed in the arm portion 42 is brought into contact with the upper surface 32U and the bolt 43 is tightened, a force in the direction of separating the arm portion 42 from the upper surface 32U by taking the reaction force from the upper surface 32U is applied, and the contact member 4 can be fixed. As a specific operation procedure, for example, the contact member 4 may be moved upward by tightening the bolt 43 from a state where the contact member 4 and the end faces 12E, 32E are not in contact as shown in FIG. 6(a). Alternatively, the contact member 4 may be moved upward by separate means such as lifting with the hand or a tool, and the bolt 43 may be tightened while maintaining the position of the contact member 4 in a state where the contact member 4 and the end faces 12E, 32E are in contact.

[0028] FIG. 7 is a diagram for explaining the design concept of the contact member according to the embodiment of the present invention. As shown in FIG. 7(a), when the bolt is tightened, a moment M2 [N·mm] that increases as it approaches the connection portion with the main body portion acts on the arm portion. The maximum value of this moment M2 is the force P b [N] and the distance l [mm] from the center of the through-tap hole to the above connection portion can be expressed as P b ×l. Here, the distance l is the total length of the contact member, that is, the distance B1 [mm] from the first contact surface to the tip of the arm portion, the distance E [mm] from the center of the through-tap hole to the tip of the arm portion on the side opposite to the main body portion, and the thickness T2 [mm] of the main body portion at the connection portion with the arm portion, and is expressed as l = B1 - E - T2. On the other hand, if the first contact surface and the second contact surface are in contact with the surfaces of the members on both sides, a moment M1 [N·mm] that increases as it approaches the connection portion with the arm portion acts on the main body portion due to the reaction force against the above force P b . Since the moments M1 and M2 are balanced at the connection portion, the maximum value of the moment M1 is also P [[ID=११]] bThis can be expressed as ×l. As shown in Figure 7(b), when the arm deforms relative to the main body due to either of these moments M1 or M2, specifically when the angle the arm makes with respect to the main body changes, it can be seen that the bolt contacts the upper surface of one of the members, and the main body contacts the end faces of both members, and reaction forces act from each surface. Note that the magnitude of the deformation is exaggerated in Figure 7(b) for illustrative purposes, and the actual deformation may be much smaller. Also, since the compression force is transmitted by the main body through contact, deformation of the arm does not affect the performance of compressive force transmission.

[0029] In the method for joining members using a contact member according to an embodiment of the present invention, when tightening the bolt 43 in the process described with reference to Figure 6, the main body 41 of the contact member 4 and the end faces 12E, 32E come into contact, and even after it appears that the bolt 43 and the upper surface 32U of the rib 32 are in contact, the bolt is continued to deform the arm portion 42 relative to the main body 41. By deforming the arm portion 42, it is easy to confirm that the contact member and the members on both sides are in reliable contact, that is, in a state in which compressive force can be transmitted. To make it easier to confirm the deformation, paint may be applied to the connection between the main body 41 and the arm portion 42, and the deformation of the arm portion 42 relative to the main body 41 may be confirmed by the change in the paint. As the paint, a brittle paint that does not follow the deformation of steel material, such as gypsum paint, may be used.

[0030] Figure 8 is a diagram illustrating the conditions under which deformation occurs in the arm portion of the contact member shown in Figure 7. As shown in the figure, when the thickness of the arm portion at the connection point with the main body is T1 [mm], the thickness of the main body portion at the connection point with the arm portion is T2 [mm], and the effective width per bolt of the main body portion and arm portion is W [mm], the section modulus Z [mm] at the connection point is... 3 ] is Z=WT1 for the arm. 2 / 6, for the main body Z=WT2 2 This becomes / 6. Furthermore, in order to ensure that deformation occurs reliably up to the plastic region and to make it easier to confirm, the plastic section modulus Z is used instead of the section modulus Z. p =WT1 2 / 4,WT2 2You may also use / 4. In the following formulas, the coefficient m is m=6 if you use the section modulus Z, and the plastic section modulus Z p When using this method, m=4. Furthermore, the effective width W is equal to the width of the main body and arm when there is one through-tapped hole and the main body and arm are formed with equal widths. If there are multiple through-tapped holes, the effective width W is obtained by dividing the width of the main body and arm by the number of through-tapped holes. The case where the widths of the main body and arm are not equal will be discussed later.

[0031] Section modulus Z or plastic section modulus Z p , as well as the yield stress σ of the steel material forming the main body and arms y [N / mm 2 From this, the moment M that causes the above-mentioned deformation of the arm occurs. y This can be calculated as shown in equation (1) below. In order for deformation of the arm to occur by tightening the bolt, the moments M1 and M2 acting on the arm and main body as described above must be moment M y It should be greater than or equal to [N·mm] (M y ≤P b ×l). These are the thickness of the arm section T1 [mm], the thickness of the main body section T2, the distance l [mm], the effective width W [mm] per bolt in the main body section and arm section, and the yield stress σ of the steel material. y , and the force P acting on the threaded portion of the through-tap hole b The conditions that must be satisfied can be summarized as shown in equation (2). If the contact member is designed to satisfy equation (2), the arm portion will deform as the bolt is tightened even after the tip of the bolt contacts the upper surface of the rib, and contact between each surface can be confirmed.

[0032]

number

[0033] Here, the force P acting on the threaded portion of the through-tap hole b The yield strength P of the threaded portion of the through-tapped hole and bolt is bt , and the axial yield strength P of the bolt by It is less than or equal to the smaller of the two values ​​(P b=min(P by ,P bt )) In other words, the force P acting on the threaded portion of the through-tap hole when actually tightening the bolt b Therefore, it is not possible to apply a force large enough to cause the bolt to yield or the through-tapped hole and the bolt's threaded portion to yield. Below, the axial yield strength P by and the yield strength P of the threaded portion bt Let's further explain an example of how to calculate it.

[0034] The axial yield strength P of a bolt by [N] is the effective cross-sectional area A of the bolt. S [mm 2 ] and the yield stress σ of the steel material constituting the bolt by [N / mm 2 The effective cross-sectional area of ​​the bolt A can be calculated from the following equation (3). S This can be determined, for example, according to JIS B1082 "Effective cross-sectional area and load area of ​​bearing surface of screw," or it can be calculated from the nominal diameter D [mm] of the bolt using formula (4).

[0035]

number

[0036] Yield strength P of through-tapped holes and bolt threads bt [N] is the smaller of the yield strength of the threaded portion of the through-tap hole and the yield strength of the threaded portion of the bolt. The yield strength of the threaded portion is the yield stress of the steel material σ y [N / mm 2 ] can be calculated using the following formula (5). Here σ y,mod [N / mm 2 ] represents the yield stress reduced considering shear stress, τ[N / mm 2 ] is the shear stress at the root of the screw thread. As shown in equation (6), the bending stress σ at the root of the screw thread b [N / mm 2 ] is σ y,mod The threaded portion is considered to yield when it reaches this point. (Bending stress σ at the base of the thread) bAssuming the thread is a cantilever beam, it can be expressed as shown in equation (7). Here, h is the height of the thread, w is the uniformly distributed load [N / mm] assuming that the axial force acting on the thread is uniform, p is the thread pitch [mm], and d3 is the diameter of the circumference of the root of the thread [mm]. n is the number of threads, and can be expressed as (L / p)-1 if the length of the thread is L [mm]. The shear stress τ at the root of the thread is given by the yield strength P of the thread. bt It can be expressed by equation (8) using . Substituting equations (6), (7), and (8) into equation (5) gives equation (9), which is P bt Solving for gives equation (10).

[0037]

number

[0038] On the other hand, the torque used when actually tightening the bolts of the contact members also needs to be above a certain level, because if it is too small, the arms will not deform. (Bolt tightening torque T) rq [N·mm] and the force P acting on the threaded portion of the through-tap hole during tightening. b,ap The relationship between [N], torque coefficient k, and the nominal diameter D [mm] of the bolt is given by equation (11). On the other hand, if deformation of the arm portion of the contact member occurs when the bolt is tightened, the moment M y Regarding [N·mm] M y ≤P b,ap Since it becomes ×l, we obtain equation (12) below by combining it with equation (1) above. From equations (11) and (12), the torque T when tightening the bolt is rq The conditions of equation (13) are obtained for this. During construction, the torque T that satisfies the conditions of equation (13) rq By tightening the bolt, the arm can be deformed to confirm contact between the contact member and the members on both sides.

[0039]

number

[0040] Figures 9 to 12 show modified examples of the contact member according to the present invention. In these examples, by changing the thickness and width of the contact member, the conditions of equation (2) above are more easily satisfied, and the torque T required in equation (13) is made easier to satisfy. rq It is being made smaller.

[0041] In the examples shown in Figures 9 and 10, a constricted portion 45 is formed in the arm portion 42 at the connection point with the main body portion 41. In this case, the arm portion thickness T1 used in equation (1) etc. above becomes the minimum thickness of the constricted portion 45. By making the minimum thickness T1 of the constricted portion 45 smaller than the thickness T2 of the main body portion 41 at the connection point, the value on the left side of equation (2) above becomes smaller, and the conditions of equation (2) are more easily satisfied. Also, the value on the right side of equation (13) above becomes smaller, resulting in a smaller torque T rq This allows the arm portion 42 to be deformed relative to the main body portion 41. The thickness of the other parts of the arm portion 42 is greater than that of the constricted portion 45, ensuring sufficient length for the bolt 43 to be screwed into the through-tapped hole 42A.

[0042] In the examples shown in Figures 11 and 12, the contact member 4 is formed such that the connection between the main body 41 and the arm 42 is the narrowest. In the example in Figure 11, the contact member 4 is isosceles trapezoidal when viewed from above, and in the example in Figure 12, the contact member 4 is right-angled trapezoidal when viewed from above. In this case, the effective width W of the main body and arm used in equation (1) etc. above is the width of the narrowest boundary. As the effective width W decreases, the value on the right side of equation (2) above increases, making it easier to satisfy the conditions of equation (2). Also, the value on the right side of equation (13) above decreases, resulting in a smaller torque T. rq This allows the arm portion 42 to be deformed relative to the main body portion 41. By widening the main body portion 41 away from the boundary, it is possible to ensure the transmission performance of compressive force by the main body portion 41 and the ease of machining when forming through tap holes 42A in the arm portion 42.

[0043] The following describes examples of contact members. When a contact member is manufactured with the dimensions of each part shown in Table 1, we will examine whether the conditions of equation (2) above are met, and the torque T calculated by equation (13). rq We investigated to what extent this would be the case.

[0044] [Table 1]

[0045] Examples 1-1 and 1-2 are examples in which contact members were manufactured with the same dimensions. For the coefficient m in equations (2) and (13), m=6 was used in Example 1-1, and m=4 in Example 1-2. As already mentioned, m=6 is the condition for causing deformation of the arm portion of the contact member, and m=4 is the condition for causing that deformation to reach the plastic region. In Example 1-1, the value on the right-hand side of equation (2) is 15.7 [mm], which is greater than the smaller of the arm portion thickness T1 and the main body portion thickness T2, i.e., T1 = 10 [mm]. Therefore, in Example 1-1, the arm portion of the contact member can be deformed by tightening the bolt. In Example 1-1, the value on the right-hand side of equation (13) is 59 [N·m], so for example, the torque T when tightening the bolt is... rq If set to 75 [N·m], contact between each surface can be confirmed by the deformation of the arm. On the other hand, in the case of Example 1-2, the value on the right side of equation (2) is 12.8 [mm], which is still larger than the smaller of the thicknesses T1 and T2, T1 = 10 [mm]. Since the value on the right side of equation (13) in Example 1-2 is 88 [N·m], the torque T is the same as in Example 1-1. rq At a torque of 75 [N·m], no deformation reaching the plastic region occurs. Therefore, for example, in the case of Example 1-2, the torque T when tightening the bolt is not reached. rq Setting this to 100 [N·m] allows for deformation of the arm portion up to the plastic range, making it easier to confirm contact between each surface.

[0046] Example 2 is an example in which the contact member was manufactured with different arm thickness T1 and body thickness T2 than in Examples 1-1 and 1-2. Note that in Example 2 and subsequent examples, the coefficient m in equations (2) and (13) is set to m=6. In Example 2, the value on the right-hand side of equation (2) is 18.3 [mm], which is greater than the smaller of the arm thickness T1 and body thickness T2, i.e., T2 = 13.8 [mm]. Therefore, in Example 2 as well, the arm portion of the contact member can be deformed by tightening the bolt. In Example 2, the value on the right-hand side of equation (13) is 124 [N·m], so for example, the torque T when tightening the bolt... rq By setting the torque to 130 [N·m], contact between each surface can be confirmed by the deformation of the arm.

[0047] Comparative Example 1 is an example in which a contact member was manufactured in which the distance E from the center of the through-tap hole to the tip of the arm opposite the main body is larger than that of Examples 1-1 and 1-2. In the case of Comparative Example 1, the value on the right side of equation (2) is 6.4 [mm], which is smaller than the smaller of the arm thickness T1 and the main body thickness T2, i.e., T1 = 10 [mm]. Therefore, in Comparative Example 1, the arm of the contact member cannot be deformed by tightening the bolt. Note that equation (13) is an equation for calculating the required torque assuming that equation (2) is satisfied, so in Comparative Example 1, for example, the torque T exceeding the value on the right side of equation (13), which is 350 [N·m], is... rq The arm does not deform even when 360 [N·m] is applied.

[0048] Comparative Example 2 is an example in which a contact member was manufactured in which the effective width W per bolt in the main body and arm portion is larger than that in Examples 1-1 and 1-2. In Comparative Example 2, the value on the right side of equation (2) is 9.7 [mm], which is smaller than the smaller of the arm portion thickness T1 and the main body portion thickness T2, i.e., T1 = 10 [mm]. Therefore, in Comparative Example 2 as well, the arm portion of the contact member cannot be deformed by tightening the bolts. Similar to Comparative Example 1, in Comparative Example 2, for example, a torque T exceeding 153 [N·m], which is the value on the right side of equation (13), cannot be used. rq The arm does not deform even when 160 [N·m] is applied. [Explanation of symbols]

[0049] 1... Small beam, 11... Upper flange, 12... Lower flange, 12E... End face, 12E1... End face, 12U... Top surface, 13... Web, 2... Main beam, 21... Upper flange, 22... Lower flange, 22S... Side surface, 23... Web, 31... Fin plate, 32... Rib, 32E... End face, 32U... Top surface, 33... Bolt, 4... Contact member, 41... Main body, 41A... First contact surface, 41B... Second contact surface, 42 ...arm section, 42A...through tapped hole, 43...bolt, 5...RC floor slab, 51...concrete, 52...reinforcement, 53...deck plate, 6...shear connector, 7...RC beam, 71...concrete, 72...reinforcement, 72A...main reinforcement, 72B...stirrup, 81...base plate, 81S...plate surface, 82...fin plate, 83...bolt, 84...anchor, 9A...RC column, 9B...RC wall.

Claims

1. A contact member interposed between an angled surface and a surface facing the angled surface, A tapered main body formed by a first contact surface and a second contact surface that forms an angle with respect to the first contact surface corresponding to the angle of the beveled surface, The main body portion includes an arm portion that protrudes from the tapered tip side where the distance between the first contact surface and the second contact surface narrows, and in which a through tap hole is formed, A bolt inserted through and screwed into the aforementioned through-tapped hole Equipped with, In the cross-sectional shapes of the main body and the arm, the thickness T of the arm at the connection point with the main body. １ , the thickness T of the main body at the connection point with the arm ２ , the distance E from the center of the through-tap hole to the tip of the arm opposite to the main body, and the distance B from the first contact surface to the tip of the arm. １ The effective width W per bolt in the main body and the arms is equal to the yield stress σ of the steel material forming the main body and the arms. ｙ , the axial yield strength P of the bolt ｂｙ , the yield strength P of the through-tap hole and the threaded portion of the bolt ｂｔ A contact member that satisfies the following equations (i) to (iii) in relation to a coefficient m (m = 6 or m = 4).

2. A constricted portion is formed in the arm at the connection point with the main body, and the thickness T of the arm at the constricted portion. １ The thickness T of the main body ２ A contact member according to claim 1, which is smaller than the contact member described in claim 1.

3. The contact member according to claim 1, wherein the connection portion between the main body and the arm is formed to be the narrowest.

4. A method for installing a contact member according to any one of claims 1 to 3, A step of inserting the main body into the gap formed between the surface of the first member and the beveled surface formed on the end of the plate-like portion of the second member facing the surface of the first member, A step of bringing the tip of the bolt, which has been inserted and screwed into the through-tapped hole, into contact with a surface of the plate-shaped portion other than the beveled surface, A step of tightening the bolt to deform the arm portion relative to the main body portion, A method for installing contact members, including the following in this order.

5. The torque T when tightening the bolt ｒｑ is the thickness T １ the thickness T ２ the distance E, the distance B １ the effective width W, the yield stress σ ｙ The construction method of the contact member according to claim 4, which satisfies the following formulas (iv) and (v) in relation to the coefficient m, the torque coefficient k, and the nominal diameter D of the bolt

6. The process of applying paint to the connection between the main body and the arm, A step of confirming that the arm has deformed relative to the main body by observing the change in the paint. The method for installing a contact member according to claim 4, further comprising:

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