JP2012136912A - Connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide connection structure capable of restraining members from being cracked by a fixture when a tensile load acts on the two members connected together by means of a tenon pipe and the fixture.SOLUTION: Connection structure makes one member 11 and the other member 21 connect together by means of a tenon pipe 31 that is inserted into shaft holes 13 and 23 elongated in an opposed manner from a boundary surface between the one member 11 and the other member 21, and a fixture such as a drift pin 34 that is inserted into side holes 17 and 27 provided in the one member 11 and the other member 21 and that passes through a pinhole 32 provided in the lateral peripheral surface of the tenon pipe 31. A lag screw 35 is screwed into the one member 11 and the other member 21 almost in parallel with or almost perpendicularly to the tenon pipe 31. Thus, the members can be strengthened. The members can be restrained from being cracked by the fixture even when a tensile load acts on the two members. This increases allowable strength of the connection structure so as to further improve safety of a building and the like.

Description

  The present invention relates to a connecting structure for connecting two rod-shaped members in a wooden building or the like.

  In various wooden structures such as wooden construction, there are very many places where two rod-shaped members are connected together. When connecting two parts, if the load conditions are loose, a simple method using only nails and adhesives is possible, but if it is a building skeleton, etc., the tenon is processed to ensure strength. Measures are required. For example, when installing a column on the upper surface of the base, in order to prevent the horizontal movement of the column, a tenon is processed in the center of the lower end surface of the column and a tenon hole is processed in the upper surface of the base, and both are fitted together. . Although such a method using a tenon has been known for a long time, there are problems such as a decrease in strength due to a cross-sectional defect of a member and adjustment during construction, and in recent years, various hardware is often used.

  When the end surfaces of two members are brought into contact with each other and connected in a straight line, or when the end surface of the other member is brought into contact with the side surface of one member and connected in a T shape or L shape, A hozo pipe may be used as an alternative to the hozo hole. The hozo pipe has a function equivalent to that of the conventional hozo, and has a simple shape obtained by cutting a steel pipe into a predetermined length, and a plurality of pin holes are formed on the side peripheral surface thereof. In addition, a shaft hole that penetrates the contact surface is processed in advance in the two members to be connected, and a hozo pipe is embedded therein.

  FIG. 8 shows an example of using a hozo pipe. In this figure, hozo pipes are used at locations where the cross members and lower columns are connected in a T-shape, and where the lower columns and upper columns are connected in a straight line, and each member has a shaft hole with the same diameter as the hozo pipe. Has been processed. Further, in order to integrate the hozo pipe and the member, a drift pin is driven into the pin hole of the hozo pipe from the side surface of the member. Therefore, a side hole penetrating the opposite surface is processed on the side surface of the member. The drift pin is a steel round bar cut out to a predetermined length, and the side hole is machined at a position corresponding to the pin hole, and has an inner diameter that can hold the drift pin only by friction. .

  The following patent documents are mentioned as an example of the prior art regarding a hozo pipe. Document 1 discloses a fixing hardware used when fixing a strut to a horizontal member with high strength in a wooden house. This fixed hardware has a structure in which the mortise pipe and the mounting plate are integrated by welding, and the mounting plate is formed in a horizontally long shape, so that the column and the strut can be fixed integrally, and is excellent in strength and workability.

  Further, Reference 2 discloses a brace fitting mounting structure in a wooden frame structure for the purpose of reducing the burden on the pillar. The purpose of this technology is to reduce the mechanical load on the wooden column when a tensile load is applied to the brace. The hozo pipe embedded inside the wooden column, the corner between the wooden base and the wooden column. Are connected with a plurality of bolts. The brace fitting is connected to the hozo pipe via a bolt, and the tensile load acting on the brace is received by the wooden pillar through the entire hozo pipe, and the stress applied to the pillar is reduced.

JP 2002-106073 A JP 2008-297849 A

  Hozo pipe is a simple shape in which a general-purpose steel pipe is cut into a predetermined length and then a pin hole is formed on the side peripheral surface, so that welding work is not required and manufacturing costs can be reduced. Enough strength against load can be secured. In addition, it is necessary to machine shaft holes and side holes for members such as pillars in advance, but these can be handled by general-purpose drills, there is no problem in processing cost and workability, and construction work on site is also easy. is there.

  However, the hozo pipe and the member are integrated only by a rod-like fixture such as a drift pin or bolt. Therefore, when a tensile load is applied to the two connected members, the fixture receives the load and tries to tear the member. As a result, as shown in FIG. 8, cracks are likely to occur in the longitudinal direction of the member (the direction of the grain) starting from the side hole, and if this grows beyond the limit, the member may be damaged. This point can be improved by increasing the number and diameter of the drift pins, but it may be difficult to cope with due to restrictions such as the thickness and cross-sectional shape of the member.

  Because of these factors, when designing a connecting structure using hozo pipes, the allowable strength is often determined in consideration of cracking of a member by a fixture such as a drift pin. Therefore, if the generation and growth of cracks can be suppressed, the allowable strength of the connection structure can be improved, and the safety of the building can be expected to be further improved. If there is a sufficient margin for the allowable yield strength, it is possible to reduce the size and weight of the structure by using a member having a smaller cross section.

  The present invention was developed on the basis of such a situation, and for the purpose of providing a connection structure capable of suppressing cracking of a member by a fixture when a tensile load is applied to two members connected by a hozo pipe and a fixture. Yes.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a hozo pipe inserted into a shaft hole extending oppositely from a boundary surface between one material and the other material, and a side hole provided in the one material and the other material. And a fixing tool that penetrates a pin hole provided on a side peripheral surface of the hozo pipe, and a lag screw is screwed into the one material and the other material substantially in parallel with or substantially at right angles to the hozo pipe. It is the connection structure characterized by this.

  The present invention is for connecting two bar-shaped members such as cross members and pillars in various wooden structures including wooden buildings, and for convenience, one of the two members to be connected is referred to as one member, The remaining one is called the other material. It should be noted that both the one material and the other material are made of a wooden material including a laminated material. In addition, the one material and the other material are always in surface contact with each other, but their arrangement is free. In addition to the case where the two members are T-shaped or L-shaped, the end surfaces of the two members are in contact with each other and are linear. In some cases, the other material protrudes obliquely from the side surface of the one material.

  The hozo pipe is a steel pipe cut out and is not different from the conventional one, and is embedded so as to straddle one material and the other material. Therefore, a shaft hole for embedding the hozo pipe is processed in advance in one material and the other material. Of course, the shaft hole needs to be concentric when the two members are correctly arranged, and has the same diameter as the hozo pipe so that no gap is generated. In addition, the hozo-pipe is literally hollow, but it can also be made into a solid round bar in view of strength and the like. It should be noted that the tensile load cannot be resisted only by embedding the hozo pipe in the shaft hole. Therefore, a fixing tool such as a drift pin is inserted into either one material or the other material.

  The fixture is in the form of an elongated rod made of steel, has a function of integrating the member and the hozo pipe, and is inserted into a side hole processed on the side surface of the member. Specific examples of the fixture include a drift pin and a bolt. The fixing tool inserted into the side hole needs to penetrate the hozo pipe, and a pin hole is formed on the side peripheral surface of the hozo pipe at the manufacturing stage. The drift pin is held inside the member only by friction with the side holes. Also, when using bolts, attach nuts with their tips penetrating the opposite surface.

  Although only one fixture may be used for each of the one material and the other material, a plurality of fixtures are usually used for each member. Also, it is rare to align all fixtures in parallel, and usually the adjacent fixtures are placed at right angles to distribute the load over a wide range.

  The lag screw is a large-sized general-purpose wood screw. A screw portion extending in a spiral shape is formed on the side peripheral surface, and is conventionally used in wooden construction. When the screw part bites into the member, the movement of the wood fiber is restricted, and the generation and growth of cracks can be suppressed. The present invention improves the proof stress of the connecting structure by utilizing such a characteristic of the lag screw. Note that the number of lag screws used and the screwing method are arbitrary, and the screw may be screwed so as to penetrate the two members or the two members may not be penetrated. However, considering the workability and effects, the lag screw shall be screwed in substantially parallel to or almost perpendicular to the hozo pipe.

  The member is strengthened by screwing the lag screw, and even when an excessive tensile load is applied to the two members, the member can be prevented from being torn by a fixing tool such as a drift pin, and the proof stress of the connection structure is improved. In addition, when the lag screw is screwed so as to penetrate the two members, the load acting on the hozo pipe and the fixture is reduced, and the proof stress of the connection structure is further improved.

  The invention according to claim 2 limits the arrangement of the two members and the screwing method of the lag screw. The side surface of one material and the end surface of the other material are in contact, and the lag screw is substantially parallel to the hozo pipe. And it is screwed toward the other material from the side surface of one material, The thread part of this lag screw straddles both the one material and the other material, It is characterized by the above-mentioned. The present invention assumes a T-shaped or L-shaped connection structure in which the end surface of the other material contacts the side surface of the one material, and the shaft hole on the one material side is processed into the side surface, while the other material side has the end surface. To process. It is also possible to project the other material in the oblique direction by cutting the end surface of the other material in the oblique direction.

  The lag screw is screwed in from the opposite side of the side surface of one material to the other material, and the tip side passes through the boundary between the one material and the other material and reaches the other material. Therefore, the hozo pipe and the lag screw are arranged substantially in parallel, and when a tensile load acts on the two members, the lag screw also receives this load. In addition, when the screwing of the lag screw is finished, the screw portion is assumed to straddle both the one material and the other material. Therefore, the lag screw does not loosen due to aging deformation of the member.

  The invention of claim 3 also limits the arrangement of the two members and the screwing method of the lag screw, the end faces of the one material and the other material are in contact with each other and are arranged in a substantially straight line. Each of the fixtures is screwed at a substantially right angle and is located on the boundary side between the one material and the other material when viewed from the fixture. In the present invention, it is assumed that the end surfaces of the one material and the other material are in contact with each other and are arranged in a straight line. However, the end surfaces of the members may be cut obliquely to have a slight intersection angle. Thus, when arranging two members linearly, it is difficult to screw in a lag screw so that these may be penetrated. Therefore, it is assumed that the lag screw is screwed from the side surface of the member substantially at right angles to the hozo pipe, and does not reach the opposing member.

  Furthermore, the lag screw is not simply screwed into the side of one material or the other material, but is screwed at a right angle with respect to a specific fixture, and when viewed from the fixture, the distance between the two members is such that there is no interference. It shall be located on the boundary surface side. When a plurality of fixtures are inserted into one member, the lag screw can be screwed in this manner for all the fixtures, but it can also be limited to some fixtures.

  Thus, by screwing the lag screw adjacent to the fixture, the vicinity of the fixture can be intensively strengthened. Therefore, even when a tensile load acts on the two members, cracking of the members by the fixture can be suppressed. In addition, when the fixture moves due to an excessive tensile load, the lag screw comes into contact with the fixture and suppresses further movement, thereby preventing the connection structure from being damaged.

  As in the first aspect of the invention, in the connecting structure in which the hozo pipe is embedded so as to straddle the boundary between the two members that are in surface contact, and the hozo pipe and the member are integrated with a fixing device such as a drift pin, the lug screw is used as the member. By screwing in, the member can be strengthened. Therefore, when a tensile load is applied to the two members, cracking of the member by the fixture can be suppressed, and the allowable proof stress of the connection structure is improved. As a result, the safety of buildings and the like is further improved, and when there is a sufficient margin for the allowable yield strength, it is possible to reduce the size and size of the structure by using a member having a smaller cross section. The lag screw can be used as a general-purpose product, and can be screwed simply by processing the pilot hole, which is excellent in terms of workability and cost.

  In the structure in which one material and the other material are connected in a T-shape or L-shape as in the invention described in claim 2, the hozo pipe is screwed into the lug screw so as to penetrate the two members substantially parallel to the hozo pipe. In addition, the lag screw also connects the two members, improving the strength.

  In the structure in which the end surfaces of the one material and the other material are brought into contact with each other and connected linearly as in the invention described in claim 3, the vicinity of the fixture is focused by screwing the lag screw adjacent to the fixture. Even when a tensile load acts on the two members, the generation and growth of cracks can be suppressed. Moreover, when the fixture is moved by an excessive tensile load, the lag screw comes into contact with the fixture, and the further movement can be suppressed, and the breakage of the connection structure can be extended to the limit.

It is a perspective view which shows the example of a shape of the connection structure by this invention, and has connected the crosspiece and the column in T shape. It is the perspective view after connecting the cross member and pillar of FIG. 1, and the longitudinal cross-sectional view of the center part. It is the longitudinal cross-sectional view which made the BB line of FIG. 2 the cutting line. It is a perspective view which shows the connection structure of the lower member and upper member which are located in a line with a perpendicular direction. FIG. 5 is a longitudinal sectional view after connecting the lower member and the upper member in FIG. 4 and a perspective view showing the arrangement of lag screws and the like at that time. It is a perspective view which shows the connection structure of a horizontal member and a diagonal material, and the diagonal material protrudes diagonally upward from the upper surface of a horizontal material. It is a perspective view which shows the example of use of this invention, and the truss is comprised with the braid material, the upper chord material, and the vertical material. It is a perspective view which shows the example of the general connection structure using a hozo pipe and a drift pin.

  FIG. 1 shows an example of the shape of a connecting structure according to the present invention. This connection structure is a T-shape in which a column 21 is placed on the upper surface of a horizontal member 11 arranged horizontally, and the horizontal member 11 is used as one material and the column 21 is used as the other material. In order to connect the cross member 11 and the column 21, the hozo pipe 31 is embedded so as to straddle the boundary between the both, and in order to further integrate the cross member 11 and the column 21 with the hozo pipe 31, a fixing tool is driven from both sides. It is out.

  The hozo pipe 31 is formed by cutting a steel pipe into a predetermined length and forming a plurality of sets of pin holes 32 penetrating the side peripheral surface. In the figure, a total of six sets of pin holes 32 are formed in two orthogonal directions. It is formed. Further, in order to embed the hozo-pipe 31, a shaft hole 13 penetrating to the back side is processed in the upper surface of the cross member 11, and a shaft hole 23 extending in the longitudinal direction is processed in the center of the lower surface of the column 21. The entire hozo pipe 31 can be embedded in the holes 13 and 23. Note that the inner diameters of the shaft holes 13 and 23 and the outer diameter of the hoso pipe 31 are equal, and when the hoso pipe 31 is embedded, both are in close contact with each other without any gap.

  A drift pin 34 is used as a fixture for integrating the hozo pipe 31 with the cross member 11 and the column 21. The drift pin 34 is a simple round bar made of steel and is driven into the side holes 17 and 27 processed on the side surfaces of the cross member 11 and the column 21 and is held only by friction. The drift pin 34 needs to be driven so as to penetrate the pin hole 32 of the hoso-pipe 31, and the side holes 17 and 27 cross the shaft holes 13 and 23 and reach the opposite surface.

  The lag screw 35 is an enlarged version of a general wood screw, and is composed of a head portion 36 for hanging a tool such as a screwdriver and a screw portion 37 in which a spiral screw is formed on the side peripheral surface. The screw is screwed from the lower surface of the cross member 11 toward the column 21. However, the outer diameter of the screw part 37 is at least about 8 mm, and the lower holes 15 and 25 are processed in advance in the cross member 11 and the column 21. Of course, both pilot holes 15, 25 need to be concentric. In this figure, four lag screws 35 are used, and the four lower holes 15 and 25 are processed.

  FIG. 2 shows a state after the cross member 11 and the column 21 of FIG. 1 are connected, and a longitudinal section of the central portion thereof. The hozo pipe 31 is entirely embedded in the cross member 11 and the column 21, and only the end face of the drift pin 34 appears in the side holes 17 and 27. The lag screw 35 is entirely embedded in the cross member 11 and the pillar 21 except for the head portion 36, and there are few parts appearing on the surface of the member, and wall materials and accessories can be freely attached in a later process. Can do. Further, as shown in the longitudinal sectional view, the hozo pipe 31 is embedded in both the cross member 11 and the column 21 without a gap, and can transmit a horizontal load smoothly. The hozo pipe 31 has six pin holes 32 in total, but the second one from the bottom does not have a drift pin 34 driven in due to its structure.

  FIG. 3 is a longitudinal cross section taken along line BB in FIG. In this figure, the pillar 21 is cut along a diagonal line, and the width of the pillar 21 is about 1.4 times longer than the longitudinal sectional view of FIG. The lag screw 35 has a screw portion 37 in almost the whole area except for the head portion 36, and the screw portion 37 straddles the cross member 11 and the column 21 when the screwing is finished. Therefore, even when the cross member 11 contracts due to drying or the like and the head 36 is lifted, the two members can be connected without loosening. However, since the screw portion 37 straddles the cross member 11 and the column 21, the column 21 cannot be drawn to the cross member 11 during screwing. Therefore, at the time of construction, the cross member 11 and the column 21 are first brought into close contact with the hozo pipe 31 and the drift pin 34, and then the lag screw 35 is screwed.

  FIG. 4 shows a connecting structure of the lower member 12 and the upper member 22 arranged in the vertical direction. In this connection structure, the end surfaces of the lower member 12 and the upper member 22 are brought into contact with each other to be elongated, and the lower member 12 is used as one material and the upper member 22 is used as the other material. The lower member 12 and the upper member 22 are rectangular bars having the same cross-sectional shape, and axial holes 13 and 23 extending in the longitudinal direction are formed at the center of the upper end surface of the lower member 12 and the center of the lower end surface of the upper member 22. The hozo pipe 31 is embedded in this, and the drift pin 34 is driven in from the side surfaces of both members to integrate both.

  Thus, in the connection structure in which the end surfaces of the two members are in contact with each other, in order to screw the lag screw 38 toward the boundary, it is necessary to process the pilot holes 15 and 25 in the oblique direction. However, this processing has poor workability and it is difficult to ensure accuracy. Further, after screwing, the head 36 of the lag screw 38 protrudes greatly from the member. In order to eliminate this point, in the present invention, the lag screw 38 is screwed into the hozo pipe 31 at a right angle. However, it is not simply screwed in, and the lower holes 15 and 25 are provided so as to be paired with the side holes 17 and 27 so that the movement of the drift pin 34 can be restricted.

  The lower holes 15 and 25 are machined at right angles to the paired side holes 17 and 27, and are located on the boundary side of the two members when viewed from the side holes 17 and 27. The paired lower holes 15 and 25 and the side holes 17 and 27 are close to each other so as not to interfere with each other. In this figure, the lower holes 15 and 25 are processed in two places with respect to the side holes 17 and 27 in one place in consideration of the balance with the hozo pipe 31. Moreover, although both the lower member 12 and the upper member 22 have processed the side holes 17 and 27 in three places, the lower holes 15 and 25 are processed with respect to all of them, and the lag screw 38 is screwed in.

  FIG. 5 shows a longitudinal section after the lower member 12 and the upper member 22 of FIG. 4 are connected, and the arrangement of the lag screw 38 and the like at that time. The lower member 12 and the upper member 22 are connected by a hozo pipe 31 and a drift pin 34, and a lag screw 38 is screwed so as to intersect the drift pin 34. Therefore, as shown in the lower right perspective view, the lag screw 38 is arranged to restrict the movement of the drift pin 34, and when the tensile load acts on the two members, the members are torn by the drift pin 34. It is difficult. Further, when the drift pin 34 moves due to an excessive tensile load, the further movement is firmly regulated by contacting the lag screw 38.

  FIG. 6 shows a connection structure of the cross member 11 and the diagonal member 29. In the connection structure of FIG. 1, the cross member 11 and the column 21 are connected in a T shape, but an oblique member 29 extending obliquely upward can be connected as shown in this figure. In this figure, the cross member 11 is one material and the diagonal material 29 is the other material. The lower end surface of the diagonal member 29 is cut in the oblique direction, and when this surface is brought into contact with the upper surface of the cross member 11, the diagonal member 29 protrudes obliquely upward. Further, the shaft holes 13 and 23 for embedding the hozo pipe 31 are not processed in the longitudinal direction of the diagonal member 29 but are processed in the vertical direction. Therefore, the shaft hole 23 is processed slightly to the right in the figure so as not to penetrate the diagonal member 29. Similarly, only two lag screws 35 are screwed slightly to the right in the drawing so as not to penetrate the diagonal member 29. In addition, a bolt 39 is used as a fixture, and after inserting the bolt 39 into the side holes 17 and 27, a nut 33 is screwed onto the tip thereof.

  FIG. 7 shows an example of the use of the present invention. The present invention can connect two members having various positional relationships such as a T-shape and a straight shape, and can be used entirely when a truss as shown in this figure is assembled. The lower chord member 41 and the upper chord member 42 are the same structure as in FIG. 4 and a plurality of members are connected in a straight line, and both ends of the vertical member 43 connecting the lower chord member 41 and the upper chord member 42 are the same as in FIG. It is connected in a T shape. Furthermore, the braces 44 are connected with the same structure as that of FIG.

11 Crosspiece (one side)
12 Lower member (one side material)
13 Shaft hole 15 Lower hole 17 Side hole 21 Column (other material)
22 Upper member (other material)
23 Shaft hole 25 Lower hole 27 Side hole 29 Diagonal material (other material)
31 Hozo pipe 32 Pin hole 33 Nut 34 Drift pin (fixture)
35 Lag screw 36 Head 37 Screw part 38 Lag screw 39 Bolt (fixing tool)
41 Lower chord material 42 Upper chord material 43 Vertical material 44 Bracing

Claims (3)

  A hozo pipe (31) inserted into a shaft hole (13, 23) facing and extending from the boundary surface between the one material (11, 12) and the other material (21, 22, 29), and the one material (11, 12) And fixtures (34, 39) inserted into the side holes (17, 27) provided in the other material (21, 22) and penetrating through the pin holes (32) provided in the side peripheral surface of the hozo pipe (31). The lag screw (35, 38) is screwed into the one material (11, 12) and the other material (21, 22) substantially parallel to or substantially perpendicular to the hozo pipe (31). Characteristic connecting structure.   The side surface of the one material (11) and the end surface of the other material (21) are in contact, the lag screw (35) is substantially parallel to the hozo pipe (31) and the one material (11) It is screwed in from the side toward the other material (21), and the thread portion (37) of the lag screw (35) straddles both the one material (11) and the other material (21). The connection structure according to claim 1, characterized in that: The end surfaces of the one material (12) and the other material (22) are in contact with each other and are arranged in a substantially straight line, and the lag screw (38) includes the hozo pipe (31) and the fixture (34, 39). The screw is screwed substantially at a right angle and is located on the boundary side between the one material (12) and the other material (22) when viewed from the fixture (34, 39). Connection structure.

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