JP3788799B2 - Joint structure of steel plate and deformed steel bar - Google Patents

Description

  The present invention relates to a joining structure of steel plates and deformed steel bars applied to joining of structural members of buildings and civil engineering structures, for example, column / beam joints, column joints, column bases, and the like.

  When joining a steel bar to a steel plate, as shown in FIG. 10, the steel bar 50 is attached to the steel plate 51, and both sides of the steel bar 50 are subjected to flare arc welding. In addition, the bar ends are flattened into strips, the flat plate portion is attached to a steel plate, bolted, or both sides of the flat plate portion are welded to the steel plate.

Further, as prior art documents related to the present invention, a steel structure column / beam joint structure using a joining sleeve, a deformed steel bar and a grout material (see Patent Document 1), a joint using a joint hardware and a joint bolt / Beam joint structure (see Patent Literature 2), sleeve metal structure with irregularities on the inner surface, deformed steel bar and steel column and foundation concrete using high-strength mortar (see Patent Literature 3), irregularities on the inner surface There are a sleeve-shaped joint metal having a substantially U-shaped cross section, a joint metal of an anchor bar using a deformed steel bar and a grout material, a joint structure, and a joining method (Japanese Patent Application No. 2002-256495).
Japanese Patent No. 2945548 Japanese Patent No. 3129685 Japanese Patent No. 3189953

  In the case of the flare welding of FIG. 10, since the weld metal does not reach (becomes incomplete), an unwelded gap is formed outward from the contact point between the steel bar and the steel plate. Further, since the steel bars and steel plates to be joined have a large heat capacity, the weld metal cannot follow the shrinkage of the weld metal accompanying the cooling in the cooling process after welding, and the vicinity of the route is notched as shown in FIG. 10 (b). From this point, cracks are likely to occur outward. For this reason, this type of welding is not reliable and is therefore not used for important structures. Moreover, this type of joining has the same problem not only with steel bars but also with cylindrical members that are hollow inside.

  On the other hand, when a sleeve-like joint metal is used as in the above-mentioned patent document, it is hoped that the sleeve-like joint metal can be soundly welded to a steel plate without welding defects by a simpler and lower cost joint structure. It is rare.

  In the present invention, when a structural member of a building or civil engineering structure is joined using a sleeve-like joint metal, the sleeve-like joint hardware is soundly free from welding defects with respect to a steel sheet by a relatively simple and low-cost joint structure. An object of the present invention is to provide a joining structure of a steel plate and a deformed steel bar that can be joined by simple welding.

  Claim 1 of the present invention is a joining structure for joining a steel plate and a deformed steel bar, and a plate-like protrusion along the longitudinal direction of the sleeve on the joining side with the steel plate on the outer surface of the cylindrical sleeve having irregularities on the inside. Has a cylindrical sleeve with a protrusion formed integrally with a pair at an interval in the circumferential direction of the sleeve so that the front end surface can be in contact with the steel sheet, the front end surface of the pair of protrusions is in contact with the steel sheet, Fillet welding or butt welding is applied to a substantially groove with a backing surface formed by the side surface of the projection and the cylindrical surface of the sleeve, a deformed steel bar is inserted into the sleeve, and a grout material is filled into the sleeve. This is a joining structure of a steel plate and a deformed steel bar (see FIG. 1, hereinafter referred to as the first invention).

  Claim 2 of the present invention is a joining structure for joining a steel plate and a deformed steel bar, the outer surface of a cylindrical sleeve having irregularities on the inside is brought into contact with the steel plate, and the cylindrical surface of the cylindrical sleeve and the steel plate surface A rod-shaped backing material is inserted in the gap between the left and right sides of the cylindrical sleeve formed by The steel plate and deformed bar steel are characterized by being constructed by butt-welding a substantially grooved groove with a backing surface, inserting a deformed steel bar into the sleeve, and filling the sleeve with a grout material. This is a junction structure (see FIG. 5, hereinafter referred to as the second invention).

  INDUSTRIAL APPLICABILITY The present invention is widely applied to the joining of pillars and beams of buildings and civil engineering structures, joining of pillars and pillars, pillar bases, and the like. Etc.), the welding method of the sleeve and the steel plate is improved.

  When both side portions of the sleeve are welded to the steel plate, the root crack of the welded portion shown in FIG. 10 is likely to occur as when the steel bar is directly welded. Therefore, a plate-like protrusion integrated with the sleeve body is provided at a position where the outer surface of the sleeve, such as a cast steel product having good weldability, is easily welded (first invention), and this plate-like protrusion is supported when welding. Alternatively, if welding is performed as a part of the sleeve body, a welding defect as shown in FIG. 10 does not occur. In addition, since welding is a fillet welding or a butt welding that is usually performed, no special skill is required. The plate-like protrusion can be integrally formed by casting or the like.

  In addition to this plate-like protrusion, a rod-shaped backing material is sandwiched in a cross-sectional wedge shape (such as a right triangle) corresponding to the plate-like protrusion with respect to the cylindrical sleeve, and fixed with an adhesive or the like. Good (second invention). In this case, it is preferable to use butt welding to directly join and integrate the steel plate and the sleeve. This rod-shaped backing material is made of metal, synthetic resin, adhesive hardened, metal powder or metal pieces hardened with synthetic resin adhesive, a bundled wire is sandwiched between the sleeve and the steel plate, and adhesive etc. What was fixed can be used.

In the joining structure of the steel plate and deformed steel bar of the present invention , the outer diameter of the sleeve is 20 mm or more, the line connecting the steel plate contact point of the sleeve and the center point of the sleeve, and the sleeve side of the backing surface of the protrusion or backing material The angle formed by the line connecting the point and the center point of the sleeve is preferably in the range of 30 ° to 45 °.

The above is a case where the arrangement position of the pair of protrusions when the sleeve is welded to the flat steel plate in the first invention is limited, as shown in FIG. 3, when the central angle θ is 30 °, It becomes butt welding (groove welding) with a groove angle of 30 °, and when the central angle θ is 45 °, it becomes a groove shape suitable for fillet welding, and sound welding according to groove welding with backing can be performed. . Further, as shown in FIG. 6, since the root interval is less than 3 mm in a sleeve having an outer diameter of 20 mm or less, the present invention is not applied. Therefore, if the position of the protrusion is selected in the range of the central angle θ of 30 to 45 ° with respect to the sleeve having an outer diameter of 20 mm or more and butt welding or fillet welding is selected, a sound welded portion without welding defects can be obtained. can get.

  Further, it can be applied not only to the flat steel plate of FIG. 1 but also to the entrance corner or the exit corner of an orthogonal steel plate as shown in FIG. The welding method may be determined in consideration of the welding posture and the like.

  In the second invention, when the sleeve is welded to a flat steel plate, as shown in FIG. 5, a rod-shaped backing material is arranged so that the central angle θ is 30 °, and butt welding is performed. Is preferred. Moreover, this rod-shaped backing material can also be applied to the entrance corner or the exit corner of orthogonal steel plates.

  Welding is carried out at the factory or in the field, and a deformed steel bar is inserted into a sleeve welded to the steel plate in the field, and a grout material is injected into the sleeve to integrate the deformed steel bar and the sleeve.

  Since the joining structure of the steel plate and deformed steel bar of the present invention is configured as described above, it has the following effects.

  (1) A plate-like protrusion integrated with the sleeve body is provided at a position where the outer surface of the sleeve, such as a cast steel product having good weldability, is easily welded, and this plate-like protrusion is backed during welding or the sleeve body. Welded as a part of the rod, or sandwiched a rod-shaped backing material with a wedge-shaped cross-section corresponding to a plate-like protrusion to the cylindrical sleeve, and fixed with adhesive etc. Welding or fillet welding can be selected, and a sound weld with no weld defects such as root cracks can be obtained.

(2) Special fillet welding or butt welding can be used, so no special skills are required
(3) Since the protrusions are integrally formed on the sleeve by casting or the like, or a rod-shaped backing material is sandwiched and fixed, the sleeve and the steel plate can be joined with a relatively simple and low-cost joining structure.

  (4) Select the position of the protrusion on the sleeve with an outer diameter of 20 mm or more in the center angle θ range of 30 to 45 °, and select butt welding or fillet welding to conform to backing groove welding. By welding, a more healthy weld can be obtained.

  Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 is a cross-sectional view, a side view, and a vertical cross-sectional view showing a basic structure according to the first invention of a joining structure of a steel plate and a deformed steel bar of the present invention. FIG. 2 is a cross-sectional view showing a case where the joint location is different from FIG. 3 and 4 are cross-sectional views showing a more specific cross-sectional shape of the first invention. FIG. 5 is a cross-sectional view showing a more specific cross-sectional shape of the second invention.

  In the basic configuration according to the first invention of FIG. 1, the joining structure of the steel plate and the deformed steel bar of the present invention is a steel plate 1 that is a constituent member of a building or a civil engineering structure, and a deformed steel bar with a braid integrally formed on the outer surface of the round steel 2, a cylindrical sleeve 3 with protrusions in which concave and convex portions 4 are formed on the inner side and a pair of plate-like protrusions 5 are integrally formed on the outer surface, and a backing surface formed by the side surfaces of the protrusions 5 and the cylindrical surface of the sleeve 3. It consists of a fillet weld or butt weld 6 to be applied to a certain substantially groove and a grout material 7 made of a high strength mortar filled in the sleeve 3.

  The pair of plate-like projections 5 are formed continuously in parallel with the longitudinal direction of the sleeve, and are arranged on the outer surface of the sleeve 3 on the steel plate 1 side at an appropriate interval in the circumferential direction of the sleeve. Is brought into contact with the surface of the steel plate 1. The cylindrical surface of the sleeve 3 may not contact the surface of the steel plate 1. A welding length L is welded to the protrusion 5. The protrusions 5 are formed continuously over the entire length of the sleeve, but may be intermittently arranged.

  After the deformed steel bar 2 is inserted into the sleeve 3, both ends of the sleeve 3 are closed with the leakage preventing member 10, and the grout material 7 is injected from the injection port 11 formed at the end of the sleeve 3. At the opposite end, there is formed a discharge port 12 used for confirming the extraction of air during filling and the filling of the grout material.

  FIG. 2 (a) is an example in which the sleeve 3 is provided at the corner of the orthogonal steel plate 1, and the protrusion 5 is formed at a portion approximately 180 ° apart and is arranged so as to be orthogonal to the surface of each steel plate. Is done. FIG. 2 (b) is an example provided at the protruding corner of the orthogonal steel plate 1, and the pair of protrusions 5 may be formed on the steel plate side of the sleeve 3. In the case where the steel plate 1 is a cold-formed square steel pipe, welding can be performed while avoiding the plastic region of the corner, and the problem of welded portion cracking and brittle fracture does not occur.

  FIG. 3 is a specific example of the arrangement of the protrusions 5 capable of sound welding when the sleeve 3 is provided on the flat portion of the steel plate 1 in the first invention, and the central angle θ of the protrusion arrangement is in the range of 30 to 45 °. By providing, sound welding according to grooved welding with backing can be performed. The center angle θ is an angle formed by a line that hangs down from the center O of the sleeve 3 to the steel plate 1 and a line that connects the center O and the root of the outer side surface of the protrusion 5. It is equal to the previous groove angle α.

  When the center angle θ in FIG. 3A is 30 °, butt welding (groove welding) with a groove angle of 30 ° is obtained. When the center angle θ in FIG. 3 (b) is 45 °, the groove angle is 45 °, so that the groove shape is suitable for fillet welding. Butt welding is used near 30 °, and fillet welding is used as it approaches 45 °. As described above, if the position of the protrusion 5 is selected in the range of the central angle θ of 30 to 45 ° and butt welding or fillet welding is selected, a sound welded portion without welding defects can be obtained.

  Furthermore, since the range of sound welding is also restricted by the outer diameter of the sleeve 3, the outer diameter range of the sleeve 3 is limited to a central angle θ of 30 to 45 °.

  That is, as shown in FIG. 6 (a), there is a groove shape regulation table 2 (excerpt) in the JIS Z3605 semi-automatic arc welding work standard. From the above definition as butt welding, as shown in FIG. 6B, for example, when θ = 45 ° with a sleeve having an outer diameter of more than 48 mm, G exceeds 7 mm, so fillet welding is adopted. As shown in FIG. 6 (c), the present invention is not applied to a sleeve having an outer diameter of 20 mm or less so that G is less than 3 mm. As shown in FIG. 6 (d), the present invention is not applied to a sleeve exceeding an outer diameter of 104 mm such that G exceeds 7 mm. Therefore, the present invention is applied to a sleeve having an outer diameter of 20 to 104 mm.

  FIG. 4 is a specific example of the arrangement of the projections 5 capable of sound welding when the sleeve 3 is provided in the corner of the orthogonal steel plate 1 in the first invention. It can arrange | position with center angle (theta) = 45 degrees, and fillet welding can be performed with respect to groove angle 45 degrees. Also when it is provided at the protruding corner of the orthogonal steel plate 1 in FIG. 2 (b), fillet welding can be performed.

  FIG. 5 shows a specific example of the second invention. In this second invention, a rod-shaped backing material 8 having a wedge-shaped cross section and extending in the longitudinal direction of the sleeve is used. The backing material 8 includes a metal, a synthetic resin, a hardened adhesive, a metal powder or metal piece hardened with a synthetic resin adhesive, a bundled wire sandwiched between a sleeve and a steel plate, and an adhesive. What was fixed can be used. The cross-sectional shape may be a triangle, and the tip of the cylindrical sleeve 3 ′ formed by the cylindrical surface of the normal cylindrical sleeve 3 ′ and the surface of the steel plate 1 is sandwiched between the left and right side portions with the tip facing inward, and then bonded. Fix with an agent. Using the right triangular backing material 8 as shown in FIG. 5, the hypotenuse and its opposite sides are touched to the sleeve and the steel plate, respectively (illustrated example), or conversely, the hypotenuse is touched to the steel plate. Butt welding 6 is applied to a substantially groove-shaped groove having a backing surface formed by the outer side surface of the backing material 8 and the cylindrical surface of the sleeve 3 '. The arrangement position of the backing material 8 is preferably a central angle θ = 30 °.

  The bar-shaped backing material 8 can also be applied to the entrance corner or the exit corner of the orthogonal steel plate in FIG. 2 (not shown). In this case, it is preferable to apply the butt weld 6 to the groove angle α = 45 °.

  FIG. 7 shows an example in which the joining structure of the present invention is applied to joining a steel column 20 incorporated in a precast member and a steel beam 21. A cylindrical sleeve 3 with protrusions is fillet welded to the outer surface of a flange 21a of the steel beam. Alternatively, it is fixed by butt welding 6, and the tip of the deformed bar 2 is inserted into the sleeve 3, and a grout material made of high-strength mortar or the like is filled into the sleeve 3. The joining structure of the present invention is used for one of the two orthogonal steel beams 21, and a normal cylindrical sleeve 3 ′ is attached to the other steel beam 21 by fillet welding at the flange end.

  When flare arc welding of a conventional steel bar directly to a steel plate, the steel bar needs to be a material that does not contain a large amount of carbon equivalent in terms of cracking. Although it is said that the strength material is inappropriate, it is possible to use the deformed steel bar 2 of the high strength material by using the sleeve. As for the welding of the sleeve and the steel material, a weldable material JIS G5102 cast steel for welded structure can be used for the sleeve. In addition, by inserting a deformed steel bar into a sleeve with irregularities on the inside and grouting it, it is possible to ensure sufficient tensile strength of the steel bar even when the clearance between the sleeve inner diameter and the steel bar outer diameter is large. There is an advantage that the allowable range is large.

  8 and 9 are examples in which the joint structure of the present invention is applied to the joining of the pillar 30 and the pillar 31. In FIG. 8, the ends of the H-shaped steels 30a and 31a of the upper pillar 30 and the lower pillar 31 of the precast member. The cylindrical sleeve 3 with protrusions is fixed to the web by fillet welding 6 (in the case of a corner), and the lower part of the deformed bar 2 is inserted into the sleeve 3 of the lower column 31 and fixed with the grout material 7 in advance. The upper column 30 is built, and the upper portion of the deformed steel bar 2 is inserted into the sleeve 3 of the upper column 30. A gap of about 5 to 10 mm is provided between the upper column 30 and the lower column 31, the periphery is covered with a leak-proof tape 32, the grout material 7 is press-fitted from the pressure inlet, and discharged from the upper discharge port.

  FIG. 9 shows an example of joining of the upper column 40 and the lower column 41 of the square steel pipe. The cylindrical sleeve 3 with projections is fillet welded or butt welded 6 on the inner four side surfaces at the ends of the upper column 40 and the lower column 41. Secure with. Other structures and assembly are the same as those in FIG. Although it may be provided outside, by providing it inside, the protruding portion of the column can be eliminated and the appearance is improved.

  When the joining structure of the present invention is applied to this pillar-to-pillar joint, it is possible to use a deformed steel bar 2 of high strength material as described above, use of a cast steel product for welded structure to the sleeve, construction during joining In addition to the advantage that the tolerance of error is large, the case of FIG. 8 has the following advantages. That is, when a steel frame is built in the precast member, for the purpose of joining the steel frames, conventionally, bolt joining using a splice plate is used as shown in FIG. 8 (d). However, in the joining structure of the present invention, a sleeve is welded to a steel member in advance, and it can be completely fixed and connected by inserting deformed steel bars and filling with grout on the spot. A construction method in which the steel frame is completely built into the member is possible.

  In addition to the above uses, the joining structure of the present invention can be applied to a column base using a sleeve, a deformed steel bar, and a grout material, and a joint using another sleeve, a deformed steel bar, and a grout material. Further, it goes without saying that the present invention is not limited to the above illustrated examples.

BRIEF DESCRIPTION OF THE DRAWINGS It is embodiment which shows the basic composition which concerns on 1st invention of the joining structure of the steel plate of this invention, and a deformed steel bar, (a) is a cross-sectional view, (b) is a side view, (c) is a longitudinal cross-sectional view. It is a cross-sectional view which shows the case where a joining location differs from FIG. 1, (a) is a case of an entrance corner, (b) is a case of an exit corner. It is a cross-sectional view which shows the more concrete cross-sectional shape in the flat plate part of 1st invention. It is a cross-sectional view which shows the more concrete cross-sectional shape in the corner part of 1st invention. It is a cross-sectional view showing a more specific cross-sectional shape of the second invention. (a) is a JIS Z3605 semi-automatic arc welding work standard groove shape specification table 2 (excerpt) Figure showing the shape of a groove in labyrinth welding, (b) to (d) are welding diameters of the sleeve according to the present invention. It is a cross-sectional view showing suitability. It is the example which applied the joining structure of this invention to the joining of a pillar and a beam, (a) is a top view, a front view, a side view, (b) is a front view, (c) is a side view. It is the example which applied the joining structure of the present invention to the column-to-column joining of H-shaped steel built-in precast, (a) is a front view before assembly, (b) is a plan view, (c) is a front view after assembly. , (D) is a front view of the conventional method. It is the example which applied the joining structure of this invention to the joining of the pillar of a square steel pipe, (a) is a front view before an assembly, (b) is a top view. It is sectional drawing which shows the conventional flare arc welding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Steel plate 2 ... Deformed bar steel 3 ... Cylindrical sleeve with protrusion 3 '... Cylindrical sleeve 4 ... Concavity and convexity 5 ... Plate-like protrusion 6 ... Fillet welding or butt welding 7 ... Grout material 8 ... ... Stick backing material

Claims (2)

  This is a joining structure for joining a steel plate and a deformed steel bar. A plate-like projection along the longitudinal direction of the sleeve hits the steel plate on the outer side of the cylindrical sleeve having irregularities on the inside, and the tip surface of the cylindrical sleeve hits the steel plate. A pair of cylindrical sleeves with protrusions integrally formed at intervals in the circumferential direction of the sleeve so as to be in contact with each other, the tip surfaces of the pair of protrusions being in contact with the steel plate, and the side surfaces of the protrusions and the cylindrical surface of the sleeve A fillet weld or a butt weld is applied to a substantially groove with a backing surface formed by inserting a deformed steel bar into the sleeve, and a grout material is filled into the sleeve. The steel plate and deformed steel bar joint structure.   A cylindrical sleeve having a joining structure for joining a steel plate and a deformed steel bar, wherein an outer surface of a cylindrical sleeve having irregularities on the inside is pressed against the steel plate, and is formed by the cylindrical surface of the cylindrical sleeve and the steel plate surface A bar-shaped backing material that has a wedge-shaped cross section along the longitudinal direction of the sleeve is sandwiched between the gaps on the left and right sides of the sleeve. A joining structure of a steel plate and a deformed bar steel, characterized by being formed by welding, inserting a deformed bar steel into the sleeve, and filling the sleeve with a grout material.

Images