JP2008240248A - Split tee joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a split tee joint which increases the tensile strength of a joint by suppressing and reducing a prying action on the joint without the use of an auxiliary member such as a reinforcing rib, a high-strength bolt member in a special shape, etc. <P>SOLUTION: This split tee joint comprises a tee flange 12 which is formed in a T shape at each of protruding ends of a base material 11 as a member to be joined, and at least two or more high-strength bolt members 13 for joining the base materials 11 to each other through each of the tee flanges 12. The split tee joint is provided with a flexible member 14 which is sandwiched between the tee flanges 12, and at least two or more ring-shaped members 15 which are provided in a penetrating state in the flexible member 14 and held by the flexible member 14. The high-strength bolt member 13 is fastened by being inserted through a hole which is formed at the ring-shaped member 15. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a split tee joint having a tee flange portion provided in a T shape at a protruding end portion of base materials that are members to be joined.

  In general, steel structures such as bridges and buildings using steel materials are often constructed by joining a large number of steel materials manufactured in a factory at a construction site. There are two main methods for joining steel materials at the construction site: a joining method using high-strength bolts and a joining method using welding. From the viewpoint of ease of quality control and reliability at the construction site, joining methods using high-strength bolts are available. Generally adopted.

  In the case of a joining method using a high-strength bolt, for example, a high-strength bolt friction joint shown in FIG. 7A or a high-strength bolt shown in FIG. It is a type such as a tensile joint (hereinafter simply referred to as “split tee”).

  The high-strength bolt friction joint of FIG. 7 (a) sandwiches steel materials 1 (hereinafter simply referred to as “base material 1”) to be joined with a contact plate 2 from both sides, and is used for the high-strength bolt and the same bolt. This is a system in which a nut (hereinafter simply referred to as “high-strength bolt member 3”) is fastened, and an acting load between steel materials is transmitted via a frictional force generated by the tightening. On the other hand, the split tee joint of FIG. 7B is generated between the members by welding the tee flange plate 4 to the protruding end portion of the base material 1 and fastening the tee flange plates 4 with the high-strength bolt member 3. This is a method of transmitting an acting load between steel materials via compressive stress.

  High-strength bolt friction joints are widely used at the construction site of steel structures because of their simple structure, but when comparing the above two types of joints, the transmission load per high-strength bolt is The split tee joint that is not affected by the slip coefficient of the member surface is larger. Therefore, when split tee joints are used, steel materials can be joined with fewer high-strength bolts than high-strength bolt friction joints, making it possible to construct steel structures economically at low cost. Become.

  In the split tee joint, when a tensile force P as shown in the explanatory view of FIG. 8 is applied to the base material 1, the operating axis of the tensile force P and the operating axis of the bolt axial force B applied to the high-strength bolt member 3 coincide. Therefore, bending deformation occurs in the tee flange plate 4 and a reaction force R is generated at the tip of the joint surface of the tee flange plate 4. Incidentally, since the acting load on the split tee joint in this case is the difference between the bolt axial force B and the repulsive reaction force R, in order to increase the tensile strength of the joint portion by the split tee joint, It is necessary to suppress the occurrence and reduce the value.

  Conventionally, as a split tee joint for the purpose of suppressing and reducing such a reaction force, for example, a technique as shown in FIG. 9A has been disclosed (Patent Document 1). In such prior art, the reinforcing rib 5 is welded between the base material 1 and the tee flange plate 4 to suppress deformation of the tee flange plate 4 and to suppress the reaction force. Alternatively, as shown in FIG. 9 (b), a technique for increasing the thickness of the tee flange plate 4 to suppress the reaction force has been conventionally known among those skilled in the art (Non-Patent Document 1).

  In addition, as a split tee joint for the purpose of reducing and reducing the reaction force, for example, there is a so-called long-tight split tee joint as shown in FIG. This is a split tee joint which is also called a double flange type. In addition to the tee flange plate 4, an anchor plate 6 is further welded to the base material 1, and a reinforcing rib plate 7 is interposed between the tee flange plate 4 and the anchor plate 6. This is intended to suppress and reduce the reaction force.

  Further, as a split tee joint for the purpose of suppressing / reducing the reaction force, a so-called tee web butt joint type as shown in FIG. 10B is also known (non-patent document). 2, 3). By the way, such a tee web butt type joint prevents the occurrence of a reaction force by abutting only the lower part of the base material 1 (tea web plate) and isolating the tip of the joint surface of the tee flange plate 4. It has a structure to do.

JP 2006-16814 A Eiichi Watanabe, Kuniyuki Sugiura, Takashi Yamaguchi, Shun-ichiro Kasai: Basic Research on Design Methods of High Strength Bolt Steel Pipe Flange Joints, Vol. 38A, Japan Society of Civil Engineers pp. 1-12, March 1992 L. P. Bouwman: Fatigue of bolted connections and bolts loaded intent, Report 6-79-9, TU Delft. , 199.7. G. Lacher: Dauerschwingersche an axialbenschuchten Schraben 10.9 in T-Verbindungen, STAHLBAU, pp. 257-266, 19877.9.

  However, when the split tee joint for the purpose of suppressing or reducing the reaction force according to the various conventional technologies described above is adopted, the material can be increased by adding auxiliary members such as reinforcing ribs and anchor plates, or by using thicker members. Since the number of pieces, the weight of the piece of material, the welded portion, etc. increase, problems such as an increase in construction cost and a prolonged construction period have occurred.

  In particular, a split tee joint with a long-clamping type as shown in FIG. 10A requires a special long bolt 8 in which a steel rod is threaded instead of a normal high-strength bolt. Use was difficult. In addition, when the joint joint surface other than the tee web is separated, as in the tee web butt joint shown in FIG. Strict anti-corrosion measures were required for the entire joint, leading to an increase in construction costs.

  The present invention aims to solve such problems in the prior art, and more specifically, without using auxiliary members such as reinforcing ribs or specially shaped high-strength bolt members. An object of the present invention is to provide a split tee joint in which the tensile strength of the joint joint is increased by suppressing and reducing the reaction force at the joint.

  In order to achieve the above-described object, the split tee joint according to the first aspect of the present invention includes a tee flange portion 12 provided in a T-shape at each protruding end portion of a base material 11 which is a member to be joined, and the tee. In a split tee joint comprising at least two high-strength bolt members 13 that pass through each of the flange portions and join the base materials 11 to each other, the flexibility sandwiched by each of the tee flange portions 12 Member 14 and at least two or more ring-shaped members 15 penetrating and gripping the flexible member 14, and the high-strength bolt member 13 has a hole provided in the ring-shaped member 15. It is configured to be inserted and fastened.

  According to such a configuration, even when an outward bending in the direction of the base material 11 due to the tensile force P occurs in the tee flange portion 12, the displacement accompanying the bending deformation of the tee flange portion 12 causes the elastic deformation of the flexible member 14. And the occurrence of a reaction force at the tip of the joint surface of the tee flange portion 12 is suppressed.

  Further, the split tee joint according to the second aspect of the present invention is the split tee joint according to the first aspect, wherein the flexible member 14 is provided at a position where the base material 11 is sandwiched. A plurality of unit flexible members that hold one set of ring-shaped members 15 are combined.

  Therefore, according to such a configuration, a plurality of unit flexible members that hold a pair of ring-shaped members 15 are combined to form split-tee joints having various sizes of joint surfaces required in an actual construction site. Can be configured freely.

  The split tee joint according to the third aspect of the present invention is the split tee joint according to the first or second aspect, wherein the elastic coefficient of the flexible member 14 is smaller than the elastic coefficient of the tee flange portion 12. In addition, the elastic coefficient of the ring-shaped member 15 is the same as the elastic coefficient of the tee flange portion 12.

  If such a configuration is specifically presented, the flexible member 14 is filled with a material having a small elasticity coefficient, such as synthetic rubber, and the ring-shaped member 15 includes the tee flange portion 12. It will be filled with a steel ring having the same elastic modulus. Therefore, according to such a configuration, even when a tensile force is applied to the tee flange portion 12, the elastic deformation of the flexible member 14 in the vicinity of the ring-shaped member 15 through which the high-strength bolt is inserted is suppressed, and the ring shape Transmission of a predetermined bolt axial force at the joint joint is ensured via the member 15.

According to the first aspect of the present invention, in the split tee joint, without increasing the weight of the tee flange portion at the joint portion, or using a reinforcing rib, other auxiliary steel material, or a special structure high strength bolt member. In addition, the reaction force at the joint joint can be reduced, and the tensile strength of the joint joint can be increased accordingly.
In addition, by preparing flexible members of various thicknesses, it becomes possible to absorb errors between steel materials to be joined that often occur in the manufacturing process of steel materials and construction processes at construction sites. It is possible to smoothly join steel materials at a construction site.

  Further, according to the second aspect of the present invention, a plurality of unit flexible members including a pair of ring-shaped members 15 are arranged side by side to be used for split tee joints having various joining areas at an actual construction site. Since the sexual member can be made, it becomes possible to standardize the enforcement member, and the construction cost can be reduced.

  Further, according to the third aspect of the present invention, since the transmission of the predetermined bolt axial force at the joint portion is ensured via the ring-shaped member 15, the separation distance between the tee flange portions constituting the split tee joint is increased. It is possible to keep the same value as that of the conventional split tee joint. As a result, adverse effects such as an increase in the separation distance between the tee flange portions caused by sandwiching a flexible member such as rubber between the joint surfaces of the split tee joint can be avoided.

  First, the structure of a split tee joint 10 which is one embodiment of the present invention is shown in the perspective view of FIG. In the figure, a base material 11 is a steel material joined by a split tee joint 10. The tee flange portion 12 is a steel plate welded so as to be T-shaped with respect to the protruding end portion of each base material 11 to be joined, and is referred to as an end plate by those skilled in the art. There is also.

  The tee flange portion 12 is provided with a plurality of holes for inserting high strength bolts for joint connection. The number of holes for inserting high-strength bolts provided in the tee flange portion 12 and the arrangement thereof are not limited to the examples shown in the figure, and can be arbitrarily selected according to the actual construction mode. Needless to say, it is determined.

  The high-strength bolt member 13 includes a high-strength bolt, a nut for fastening the bolt, and washers. The high-strength bolt member 13 splits through the tee flange portion 12 and a flexible member 14 and a ring-shaped member 15 described later. It plays a role of fastening the joint portion of the tee joint 10.

  The flexible member 14 is a plate-like member having flexibility and flexibility that is sandwiched between the tee flange portions 12, and has an elastic coefficient smaller than that of the tee flange portion 12. And Incidentally, as the flexible member, it is preferable to use a synthetic rubber member excellent in environmental resistance such as chloroprene rubber. Further, when a synthetic rubber member is used for the flexible member 14, the numerical value of the rubber hardness (Hs hardness) is not particularly limited. However, from the standpoint of practicality and convenience during actual construction, Hs50 degrees It is preferable that the hardness is about Hs 90 degrees. In addition, if the reaction force at the front end portion of the joint surface of the tee flange portion 12 is reduced and based on the viewpoint of increasing the strength of the joint coupling portion, the rubber hardness value is smaller. Is more effective.

  Next, FIG. 2 shows an explanatory diagram in which only the flexible member 14 and the ring-shaped member 15 are taken out from the split tee joint 10. 2A is a perspective view of the flexible member 14, and FIG. 2B is a cross-sectional view of the flexible member 14 in the AA 'direction. As shown in FIG. 2, the flexible member 14 is provided with ring-shaped members 15 at positions corresponding to the holes for inserting the high-strength bolts provided in the tee flange portion 12. .

  The ring-shaped member 15 is, for example, a ring-shaped member made of a steel material such as JIS standard SS400, and has the same elastic coefficient as that of the tee flange portion 12. Therefore, even when a tensile force is applied in the base material direction of the split tee joint 10, it does not elastically deform like the flexible member 14. Moreover, although the dimension of the ring-shaped member 15 is not specifically limited, It is preferable that the thickness is substantially equivalent to the thickness of the flexible member 14 from the viewpoint of penetrating and gripping the flexible member 14. Moreover, it is preferable that the inner diameter and outer diameter dimensions of the ring are the same as those of a washer used for a high-strength bolt inserted through the ring.

Next, the operation of the split tee joint 10 according to this embodiment will be described.
As described above with reference to FIG. 8, when a tensile force P is applied in the base material direction of the split tee joint, deformation in the out-of-plane bending direction is induced in the tee flange portion.

  However, when the tee flange portions are directly joined at the joint surface as in the conventional split tee joint, the deformation of the tee flange portion in the vicinity of the distal end portion is suppressed by the rigidity of the tee flange portions at the joint surface. The For this reason, as shown in FIG. 8, the tee flange portion is deformed into a shape in which only the central portion protrudes without being deformed in the vicinity of the tip portion. As a result, a repulsive force in the vicinity of the tip of the joint surface of the tee flange portion is generated.

  On the other hand, in the split tee joint 10 according to the present embodiment, a flexible member 14 such as a rubber member having a small elastic coefficient is sandwiched between the joint surfaces of the tee flange portions 12. Therefore, when a tensile force P is applied to the split tee joint 10, as shown in FIG. 3, the distal end portion of the tee flange portion 12 compresses the flexible member 14 and the distal end portion of the tee flange portion 12. Bending deformation occurs in the vicinity. Further, since the bending deformation in the vicinity of the tip portion is not suppressed, the reaction force that has conventionally occurred in the vicinity of the tip portion of the tee flange portion is suppressed / reduced.

  That is, in the split tee joint 10 according to the present embodiment, by allowing a flexible member such as rubber having a smaller elastic coefficient than the steel material to be sandwiched between the joint surfaces of the joint, the deformation in the vicinity of the tip portion of the tee flange portion is allowed.抑制 Reducing and reducing reaction forces. In addition, it cannot be overemphasized that the tensile strength in a joint coupling part improves by suppression and reduction of this bending reaction force.

  Next, an example of the result of the experiment conducted for verifying the effect of the split tee joint 10 according to the present embodiment is shown in the graphs of FIGS. 4 and 5. 4 is a graph in which the relationship between the applied load P / 2 per high-strength bolt of the split tee joint and the bolt axial force B of the high-strength bolt is measured, and FIG. It is a graph showing the relationship between the acting load P / 2 per one high-strength bolt and the separation distance δ between the tee flange portions on the joint interface.

First, the graph of FIG. 4 will be described. The bolt axial force at the time of yielding of a high-strength bolt, which is one standard for structural design.
B0 = 79.2kN (indicated by a broken line in FIG. 4)
In the conventional split tee joint, the strength of the joint connecting portion corresponding to, that is, the magnitude (Py) of the acting load P at the time of yielding,
Py1 = 59.5 kN (indicated by the alternate long and short dash line in FIG. 4)
It becomes.

On the other hand, in the split tee joint 10 according to the present embodiment, the magnitude of Py corresponding to the bolt axial force B0 is
Py2 = 72.5 kN (shown in a dashed line in FIG. 4)
Thus, it can be seen that the yield strength is increased by about 20% compared to the conventional method.

In addition, when looking at the magnitude of the maximum load Pu indicating the ultimate strength when reaching the ultimate limit state leading to the fracture of the joint joint, in the conventional split tee joint,
Pu1 = 85.7 kN (indicated by a two-dot chain line in FIG. 4)
On the other hand, in the split tee joint 10 according to the present embodiment,
Pu2 = 94.0 kN (indicated by a two-dot chain line in FIG. 4)
Thus, it can be seen that the ultimate strength is increased by about 10% compared to the conventional method.

  Further, the graph of FIG. 5 will be described. With respect to the initial separation rigidity of the split tee joint (corresponding to the slope of the characteristic curve shown in FIG. 5), the split tee joint according to the present embodiment and the conventional joint are used. The difference is small, and it can be said that the influence of sandwiching the flexible member on the joint interface is almost negligible. Note that the separation distance δ in the graph of FIG. 5 indicates the separation distance immediately below the base material of the joint surface of the tee flange portion.

  In the embodiment of the present invention described above, the flexible member 14 sandwiched between the tee flange portions 12 of the split tee joint 10 has been described as an integral member. It is not limited to examples. For example, as shown in the perspective view of FIG. 6, the flexibility of holding a pair of ring-shaped members 15 penetrating at a position where the base material 11 is sandwiched (positions on both sides of the base material 11). A member 14 ′ (hereinafter simply referred to as “unit flexible member”) is prepared, and a plurality of such unit flexible members 14 ′ are combined to form a flexible member 14 sandwiched between the tee flange portions 12. You may make it comprise.

  For example, when joining steel materials by split tee joints using three sets (six) of high-strength bolts as shown in FIG. 2, the unit flexible member 14 ′ of FIG. It is only necessary to arrange the three pieces in the direction to constitute the flexible member 14 for the split tee joint. By adopting such a configuration, standardization of the enforcement member at the enforcement site of the steel structure is facilitated, and the construction cost can be reduced.

  Note that, in a flexible member such as rubber, the rigidity generally tends to decrease as the free surface area increases. Therefore, by changing the flexible member sandwiched in the split tee joint according to the present invention from a monolithic structure to a divided structure in which the unit flexible member 14 'is combined, the effect of suppressing and reducing the reaction force is further increased. I can expect.

  Further, the present invention is not limited to each embodiment described above, for example, the shape and arrangement of each part constituting the present invention, or the material thereof without departing from the spirit of the present invention. Needless to say, it can be changed as appropriate according to the actual implementation.

The configuration of the present invention described above can be used in the joining of steel materials at the construction / construction site of steel structures such as bridges and buildings.

It is a perspective view which shows one Example of the split tee joint by this invention. It is explanatory drawing which shows the structure of the flexible member and ring-shaped member which are included in the split tee joint of FIG. It is explanatory drawing which shows the effect | action and operation | movement in the split tee joint of FIG. 2 is a graph showing a relationship between an applied load P / 2 per high-strength bolt in the split tee joint of FIG. 1 and a bolt axial force B of the high-strength bolt. 2 is a graph showing a relationship between an applied load P / 2 per high-strength bolt in the split tee joint of FIG. 1 and a separation distance δ between tee flange portions on a joint joint surface. It is a perspective view which shows the other Example of the flexible member and ring-shaped member which are included in the split tee joint of this invention. It is a perspective view which shows the structure of the joint joint of the steel materials by the conventional high strength bolt. It is explanatory drawing showing the effect | action and operation | movement by the tensile force applied to the split tee joint. It is explanatory drawing which shows the structure of the conventional split tee joint for the purpose of suppression and reduction of a reaction force. It is explanatory drawing which shows the structure of the other split tee joint for the purpose of suppression and reduction of a reaction force.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Joint plate 3 ... High strength bolt member 4 ... Tee flange plate 5 ... Reinforcement rib 6 ... Anchor plate 7 ... Rib plate 8 ... Long bolt 10 ... Split tee joint 11 ... Base material to be joined DESCRIPTION OF SYMBOLS 12 ... Tee flange part 13 ... High-strength bolt member 14 ... Flexible member 14 '... Unit flexible member 15 ... Ring-shaped member P ... Tensile force B ... Bolt axial force R ... Repulsive force

Claims (3)

A tee flange portion 12 provided in a T-shape at each protruding end portion of the base material 11 that is a member to be joined, and at least two pieces that join the base materials 11 through each of the tee flange portions 12. In the split tee joint comprising the above high strength bolt member 13,
A flexible member 14 sandwiched by each of the tee flange portions 12,
And at least two or more ring-shaped members 15 penetrating and gripping the flexible member 14,
The split tee joint, wherein the high-strength bolt member 13 is fastened through a hole provided in the ring-shaped member 15.   The flexible member 14 is configured by combining a plurality of unit flexible members that hold a pair of ring-shaped members 15 penetrating at positions where the base material 11 is sandwiched. The split tee joint according to claim 1. The elastic coefficient of the flexible member 14 is smaller than the elastic coefficient of the tee flange portion 12, and the elastic coefficient of the ring-shaped member 15 is equivalent to the elastic coefficient of the tee flange portion 12. The split tee joint according to claim 1 or 2.

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