JP2005200994A - Joining structure of closed cross-sectional member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aesthetic compact joining part without substantially anything outside the joining part, for extremely easily performing joining work at a job site, by providing sufficient joining strength by a relatively easy and inexpensive joining structure, in the joining structure such as a column base for joining a column and a column and joining the column and a concrete member. <P>SOLUTION: A plurality of sleeves 10 are fixed in advance by welding in a factory at an interval in the column peripheral direction in parallel to the column axis direction on an inside surface in a joining end part of an upper column 1 and a lower column 2 composed of a square steel pipe and a circular steel pipe of a closed cross-sectional steel frame. A lower part of deformed bar steel 11 is inserted into the lower sleeve 10, and is fixed by a grout material 12. The upper column 1 is suspended on the lower column 2. The upper column 1 is built up on the lower column 2 while inserting an upper part of the deformed bar steel 11 into the upper sleeve 10, and the upper sleeve 10 and the deformed bar steel 11 are fixed by filling the grout material 12 in the upper sleeve 10 or the lower part of the deformed bar steel 11 is temporarily fastened in the lower sleeve 10 by a positioning spacer, to be simultaneously grouted by the upper column and the lower column. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to the joining of closed cross-section members such as circular steel pipes and rectangular steel pipes in buildings and civil engineering structures, for example, joining of columns and columns, joining of columns and reinforced concrete members, joining of cross-sectional members applied to column bases, etc. Concerning structure.

  Conventionally, a so-called erection piece is used for joining a steel column and a steel column. FIG. 7 is an example in which the upper column 1 and the lower column 2 made of a square steel pipe are joined at a construction site. The mounting plates 50 are respectively welded in advance to the outer surfaces at the joining end portions of the upper column 1 and the lower column 2. Every time (factory welding), the upper and lower mounting plates 50 are bolted using the joint plate 51 and temporarily fixed. A welding groove is formed in advance on the joining end face of the upper pillar 1 and the lower pillar 2 (factory processing), and the upper pillar 1 and the lower pillar 2 are joined and integrated by field welding. The attachment plate 50 is cut and removed after the welding is completed. The same applies to a round steel pipe.

  FIG. 8 shows an example of a conventional column base, in which a base plate 60 is fixed to a joint end surface of a column 3 made of a square steel pipe by welding, and the tip of an anchor bolt 61 embedded and fixed in the foundation concrete 4 is attached to the base plate. The base plate 60 is fixed on the foundation by being inserted into the mounting holes 60 and tightening the nuts 62. Such a column base bending moment is transmitted to the foundation as a compressive force at one end of the base plate 60, transmitted to the anchor bolt 61 as a tensile force at the other end, and transmitted to the foundation by the fixing hardware 63. In addition, in order to distribute and transmit the fixing force of the anchor bolt 61 to the foundation, a reinforcing bar rod composed of a main bar and a hoop bar is embedded so as to surround the outer periphery of the anchor bolt (not shown).

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 document 2), sleeve metal structure with irregularities on the inner surface, deformed steel bar, steel column and basic concrete using high strength mortar (see patent document 3), irregularities on the inner surface There are a sleeve-shaped joint metal having a substantially U-shaped cross-section, an anchor bar joint metal / joint structure / joint method (Japanese Patent Application No. 2002-256495) using a deformed steel bar and a grout material.
Japanese Patent No. 2945548 Japanese Patent No. 3129685 Japanese Patent No. 3189953

  In the case of joining the steel column and the steel column by the conventional erection piece of FIG. 7, the column base material 3 is damaged when the mounting plate 50 is cut and removed, and therefore the mounting plate 50 cannot be completely removed. As shown in b), there is a drawback that the base of the mounting plate 50 remains. In addition to impairing the appearance, there is a risk of causing brittle fracture during an earthquake due to the welded portion of the mounting plate 50 as a starting point even if the finishing is performed. Furthermore, in the case of a PC column filled with concrete inside the steel pipe, the internal concrete deteriorates due to the effect of the heat of field welding. To avoid this, the part where the thermal effect is expected is hollowed out, and after welding, the side of the column It must be filled with concrete from the hole. Alternatively, concrete is filled up to the middle of the lower column, and the upper column is poured from the top after joining, or a hole is made in the side of the column and pressed into the concrete. In any case, there is a problem that workability on site is poor.

  In the case of the column base using the base plate and the anchor bolt shown in FIG. 8, the anchor bolt 61 is fixed on the base plate 60 with the nut 62, so that the anchor bolt 61 becomes invalid on the compression side. Further, the base plate 60 is large, and the rising width a of the foundation concrete 4 requires an extra width b on the outside of the base plate 60, and the position of the column is forced to recede from the boundary line of the adjacent land. Furthermore, in order to conceal the tip end portion of the anchor bolt 61 and the nut 62 in terms of design, it is often necessary to use the additional concrete 5.

  The present invention is relatively simple in the joining of closed cross-section members such as circular steel pipes and rectangular steel pipes in buildings and civil engineering structures, for example, in joining structures of columns and columns, joining columns and reinforced concrete members, and column bases. A low-cost joint structure that provides sufficient joint strength and is extremely easy to perform on-site joining, and also provides a beautiful and compact joint with no protrusions on the outside of the joint. The object is to provide a joint structure.

  Claim 1 of the present invention is a joint structure for joining a closed cross-section steel column and a closed cross-section steel column to each other at the joint end of each of the upper and lower closed cross-section steel columns (such as a square steel pipe and a round steel pipe). A plurality of sleeves parallel to the column axis direction (sleeves with irregularities on the inner surface or sleeves without irregularities on the inner surface) are fixed on the side surface at intervals in the column circumferential direction (butt welding, fillet welding, groove welding, etc.) The upper and lower portions of deformed steel bars are inserted into the upper and lower sleeves of the upper and lower closed steel columns, respectively, and the upper and lower sleeves are filled with grout material (high-strength mortar, resin adhesive, etc.) This is a feature of a closed cross-section member joining structure (see FIG. 1, hereinafter referred to as a first invention).

  The first aspect is applied to joining steel pipe columns or concrete-filled steel pipe columns. The joining operation is performed as follows. Upper and lower sleeves are fixed in advance by welding at the factory, etc., in the lower part of the upper pillar and the upper part of the lower pillar. The lower part of the deformed steel bar is inserted into the lower sleeve of the lower pillar, and the grout material is inserted into the lower sleeve. The deformed bar is protruded and fixed by the fixed length of the sleeve, and the upper column is suspended on the lower column, and the upper portion of the deformed bar is inserted into the upper sleeve and placed on the lower column. The upper pillar is built, grout material is poured into the upper sleeve, and the upper part of the deformed steel bar is fixed to the upper sleeve. Alternatively, a deformed steel bar is temporarily fixed to the lower sleeve using a spacer or the like, and the lower sleeve and the upper sleeve can be grouted simultaneously at the construction site. The upper column and the lower column are joined and integrated by the upper and lower sleeves inside the column, the deformed steel bar, and the grout material.

  According to the column-to-column joining structure of the present invention as described above, (a) the mounting plate and the joint plate in the conventional column-to-column joining are not required, (b) on-site welding is not required, (c ) Eliminates the need to cut and remove the mounting plate after on-site welding, (d) eliminates the risk of brittle fracture from the location where the mounting plate is cut and removed, (e) the joining time is 1/3 to (F) In the case of a PC column, concrete can be placed up to the end face of the column in advance at a factory, etc. (G) There is nothing on the outer surface of the joint, and it is beautiful and a continuous plane can be obtained.

  Claim 2 of the present invention is a joint structure for joining a closed cross-section steel column to a concrete member, on the inner side surface of the joint end of a closed cross-section steel column (such as a square steel pipe or a round steel pipe) in the direction of the column axis. Multiple parallel sleeves (sleeves with irregularities on the inner surface or sleeves without irregularities on the inner surface) are fixed at intervals in the circumferential direction of the column (butt welding, fillet welding, groove welding from the outside of the column, etc.). A closed cross section characterized in that the tip of a deformed steel bar whose base is embedded and fixed is inserted into the sleeve, and the sleeve is filled with grout material (high strength mortar, resin adhesive, etc.) This is a joining structure of members (see FIG. 2, hereinafter referred to as a second invention).

  The second aspect of the present invention is applied to the joining of a steel pipe column and lower concrete, foundation concrete (column base), reinforced concrete column or the like. The joining operation is performed as follows. A deformed steel bar is embedded in the lower concrete member so as to protrude by a predetermined sleeve fixing length. Inside the lower part of the column, a sleeve is fixed in advance by welding at a factory or the like. A column is hung on the top of the concrete member, and the upper part of the deformed steel bar is inserted into the sleeve while the pillar is built on the concrete member. A grout material is injected into the sleeve of the pillar, and the upper part of the deformed steel bar is fixed to the sleeve. The column and the concrete member are joined and integrated by the sleeve inside the column, the deformed steel bar, and the grout material.

  According to the joint structure of a pillar and a concrete member of the present invention as described above, (a) when used for a foundation, a conventional base plate is not required, and (b) when used for a foundation, an anchor bolt during an earthquake. When subjected to tensile force, there is no occurrence of elongation strain at the bottom of the nut of the anchor bolt and the performance does not deteriorate. (C) When used as a foundation, the outer diameter of the deformed steel bar Since the clearance between the sleeve and the inner diameter of the sleeve is large, there is no need for strict accuracy control for inserting the anchor bolt into the bolt hole of the base plate as in the conventional case. Columns can be built close to the building, enabling effective use of the site. (E) S columns can be easily erected on the RC frame. And ramen structure Can be constructed, (f) without any outside the joint, with a beautiful, when used in foundation or the like, is increasing droplet concrete since no projections at the foot becomes unnecessary.

  In Claims 1 and 2, welding is used to fix the sleeve to the inner surface of the column, but in order to avoid flare welding, which is likely to cause defects, plate-like protrusions are provided on both sides of the sleeve, and the protrusions are provided. Butt welding or fillet welding is performed as a backing material. Further, when workability is poor, it is possible to provide groove welding by providing a slit in the longitudinal direction of the sleeve on the column side plate.

  Since the joint structure of the closed cross-section member of the present invention is configured as described above, it has the following effects.

  (1) When joining columns and columns, or joining columns and concrete members, they are joined using a sleeve fixed to the inside of the column, deformed steel bar, and grout material. Strength is obtained.

  (2) The sleeve is fixed inside the column in advance at the factory, and the deformed steel bar is inserted into the sleeve at the site and fixed and integrated with the grout material. Reduction is achieved.

  (3) Since the sleeve is provided inside the column, there are no protrusions on the outside of the joint, and a beautiful and compact joint can be obtained.

  (4) In the case of a PC column, concrete can be placed in advance up to the end face of the column at a factory or the like, so that it is not necessary to fill the concrete on-site as in the past.

  Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 shows an example of a joining structure for joining a closed section steel column and a closed section steel column of the present invention. FIG. 2 shows an example of a joining structure for joining the closed section steel column and the concrete member of the present invention. FIG. 3 shows an example of a closed section steel column and an example of sleeve arrangement. 4 and 5 show examples of two types of sleeve shapes. FIG. 6 shows an example of sleeve welding.

  In the embodiment of FIG. 1, the joint structure of the present invention is parallel to the direction of the column axis that is fixed by welding to the inner side surfaces at the joint ends of the upper column 1 and the lower column 2 made of a square steel pipe having a closed cross-section steel frame. A plurality of sleeves 10 spaced apart in the circumferential direction of the column, a deformed steel bar 11 in which a bar is integrally formed on the outer surface of the round steel, and an upper portion and a lower portion are respectively inserted into the upper and lower sleeves 10; It is comprised from the grout material 12 which consists of high-strength mortar, an epoxy resin adhesive, etc. which are made.

  The upper and lower sleeves 10 may be U-shaped in cross section, but a cylindrical sleeve having a circular ring shape in cross section is preferable. Further, it is preferable that the upper and lower sleeves 10 are completely housed in the upper column 1 and the lower column 2 so that they cannot be seen from the outside, and the sleeve end surface and the column end surface are flush with each other. The deformed steel bar 11 has a length that is completely accommodated in the upper and lower sleeves 10 that are continuous in a joined state.

  The upper column 1 and the lower column 2 may be circular steel pipes or other closed section steel columns. Moreover, the upper pillar 1 and the lower pillar 2 may be left hollow, or may be filled with concrete 13 to be a PC pillar (concrete-filled steel pipe pillar). The sleeve 10 is a cylindrical sleeve with a bottom or a cylindrical sleeve closed at both ends with a leak-proofing member so that the grout material does not leak, and in the case of a PC column, concrete does not flow into the sleeve.

  In the joining structure of a steel column and a steel column as described above, the steel column and the steel column are joined in the following procedure (see FIG. 1).

  (1) As shown in FIG. 1 (d), upper and lower sleeves 10 are fixed to a lower portion of the upper column 1 and an upper portion of the lower column 2 in advance by welding at a factory or the like, respectively. 11 is inserted, the lower sleeve 10 is filled with a grout material 12, and the deformed steel bar 11 is fixed. In the case of a PC pillar, as shown in FIG. 1 (e), concrete 13 is placed in advance to the end faces of the upper pillar 1 and the lower pillar 2 at a factory or the like.

  (2) The upper column 1 is suspended on the lower column 2, and the upper column 1 is built on the lower column 2 while the upper portion of the deformed steel bar 11 is inserted into the upper sleeve 10.

  (3) As shown in FIG. 1 (a), the upper sleeve 10 and the upper column 1 are provided with an inlet 14 and an outlet 15 for communicating the inside and outside of the sleeve at the lower position and the upper position of the sleeve, respectively. The grout material 12 is injected into the upper sleeve 10 from the inlet 14 and discharged from the outlet 15 to check the filling of the grout material 12.

  Here, in the case of a PC column, a slight gap is provided on the contact surface between the upper column 1 and the lower column 2, the periphery thereof is sealed with gum tape or the like to prevent leakage, and a grout is formed from an injection port formed in a part thereof. When the material 12 is injected, the grout material 12 is filled not only in the upper sleeve 10 but also in the gap between the contact surfaces, so that the upper column 1 and the lower column 2 are securely fixed.

  In addition, the grout injection into the sleeve of the lower pillar can be performed at the same time as the upper pillar in the field. In this case, for example, the deformed steel bar 11 is temporarily fixed in the lower sleeve 10 using a neoprene positioning spacer 19 as shown in FIG.

  Next, in the embodiment of FIG. 2, the joining structure of the present invention is parallel to the column axis direction fixed to each inner side surface of the joining end portion of the column 3 made of a square steel pipe by welding and spaced in the column circumferential direction. A plurality of sleeves 10, a bar is integrally formed on the outer surface of the round steel, a lower base portion is embedded and fixed in the reinforced concrete member 4, and an upper end portion is inserted into the sleeve 10. It is composed of a grout material 12 made of a high-strength mortar or an epoxy resin adhesive filled inside.

  The pillar 3 and the sleeve 10 are the same as the upper pillar 1 and the upper sleeve 10 of FIG. The column 3 may be a circular steel pipe or other closed section steel column. The deformed steel bar 11 is embedded in the reinforced concrete member 4 in advance, and the tip protrudes from the upper surface of the reinforced concrete member 4 by a predetermined sleeve fixing length. Reinforcing bars are arranged in the reinforced concrete member 4 (not shown). In the illustrated example, a fixing hardware 16 is provided at the lower end of the deformed steel bar 11. When the reinforced concrete member 4 is a reinforced concrete column, the main reinforcing bar is a deformed steel bar 11, and the main reinforcing bar may be protruded from the upper surface of the reinforced concrete column by a predetermined sleeve fixing length. Further, the filling method of the grout material when the column 3 is a PC column is in accordance with the above-described PC column filling method of FIG.

  This joint structure can be applied when standing a steel pipe column of a steel frame from a reinforced concrete frame. It can also be applied to joints with reinforced concrete foundations, ie column bases. In the case of a column base or the like, the joint is smart because it is performed inside the column, and there is no protrusion, so there is no need for additional concrete for shielding. Further, since there is no base plate, the rising concrete portion of the foundation can be made compact. Furthermore, if the deformed steel bar 11 is used as a rising main bar, and the hoop bar is fixed with a binding wire or the like, the shape of the reinforced concrete member 4 in plan view can be reduced as compared with a case where a normal reinforcing bar rod is disposed on the outside. .

  In the joining structure of a steel column and a concrete member as described above, the joining operation of the steel column and the concrete member is performed in the following procedure (see FIG. 2).

  (1) As shown in FIG.2 (c), the deformed steel bar 11 is embed | buried in the reinforced concrete member 4, and the sleeve 10 is previously fixed to the lower part of the pillar 3 by welding at the factory. In the case of a PC pillar, as shown in FIG. 2 (d), concrete 13 is placed in advance to the end face of the pillar 3 at a factory or the like.

  (2) The column 3 is suspended on the reinforced concrete member 4 and the column 3 is built on the reinforced concrete member 4 while the upper portion of the deformed steel bar 11 is inserted into the sleeve 10.

  (3) The upper protruding portion of the deformed steel bar 11 is completely stored in the sleeve 10, and the grout material 12 is injected into the sleeve 10 from the injection port 14 and discharged from the discharge port 15 to fill the grout material 12. Confirm. In the case of a PC column, as in FIG. 1, a slight gap is provided on the contact surface between the column 3 and the reinforced concrete member 4, and sealing is performed with gum tape or the like. And are securely fixed.

  3A is an example in which a plurality of sleeves are arranged on a circular steel pipe, and FIG. 3B is an example in which a plurality of sleeves are arranged on a square steel pipe, and both sides of the sleeve 10 are fixed to the inner surface of the steel pipe by welding. This welding is preferably butt welded directly to the inner surface of the steel pipe as will be described later. If workability is poor, a slit in the sleeve longitudinal direction can be provided in the sleeve contact portion of the steel pipe side plate, and groove welding (plug welding or slot welding) can be used.

  Two types of sleeves 10 can be used. As shown in FIG. 4, the sleeve 10 uses a sleeve having irregularities 17 on the inner surface, and is integrated with the deformed steel bar 11 with a grout material 12 such as high-strength mortar or epoxy resin adhesive. The deformed steel bar 11 is inserted into the sleeve 10, both ends of the sleeve 10 are closed with a leakage preventing member (not shown), injected into the sleeve 10 from the inlet 14, and discharged from the outlet 15. In this way, when a deformed steel bar is inserted into a sleeve with irregularities on the inner side and grouted, the tensile strength of the steel bar can be sufficiently secured even if the clearance between the sleeve inner diameter and the steel bar outer diameter is large, and construction errors during joining There is an advantage that the allowable range is large.

  As shown in FIG. 5, when an epoxy resin adhesive is used, the sleeve 10 can be a sleeve without irregularities, and the length of the sleeve 10 is 2.5 times or more the diameter of the steel bar. In this case, although the insertion accuracy becomes severe, the sleeve length only needs to be 2.5 times or more the diameter of the steel bar, and the arrangement in the steel pipe becomes easy.

  FIG. 6 shows a case in which a protrusion 18 extending in the longitudinal direction of the sleeve is provided on the side surface of the sleeve 10 such as a cast steel product having good weldability in order to avoid flare welding in which defects are likely to occur. By using it, butt welding and fillet welding can be performed. FIG. 6A shows the case of a corner and FIG. 6B shows the case of a flat part, and it is preferable to provide the protrusion 18 so that the groove angle is in the range of 30 to 45 °. Butt welding is possible when the groove angle is about 30 ° and the sleeve diameter is relatively small, and fillet welding is possible when the groove angle is about 45 ° and the sleeve diameter is relatively large. By providing such protrusions, welding according to the grooved welding with backing can be performed, and a sound welded portion having no welding defects can be obtained.

  Needless to say, the present invention is not limited to the illustrated examples.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an embodiment of a joining structure for joining a closed section steel column and a closed section steel column of the present invention, (a) is a front view after joining, and (b) is a horizontal section when the column is a square steel pipe. Figure, (c) is a horizontal sectional view when the column is a circular steel pipe, (d) is a vertical sectional view before joining, (e) is a vertical sectional view before joining the PC column, and (f) is a perspective view of the positioning spacer. FIG. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an embodiment of a joining structure for joining a closed cross-section steel column and a concrete member of the present invention, (a) is a front view after joining, (b) is a horizontal sectional view, and (c) is before joining. Vertical sectional view, (d) is a vertical sectional view before joining the PC columns. It is a horizontal sectional view which shows the example of the closed cross-section steel column of this invention, and the example of arrangement | positioning of a sleeve. It is the front view and side view of a deformed steel bar showing an example of the sleeve shape used in the present invention, and a sectional view of the sleeve. It is sectional drawing which shows the other example of the sleeve shape used by this invention. It is sectional drawing which shows the example of welding of the sleeve used by this invention. It is the front view and sectional drawing which show the joining structure of the conventional pillar and the pillar in order of a process. (A) shows a conventional column base structure, and (b) is a horizontal sectional view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Upper pillar 2 ... Lower pillar 3 ... Pillar 4 ... Reinforced concrete member 10 ... Sleeve 11 ... Deformed bar 12 ... Grout material 13 ... Concrete 14 ... Injection port 15 ... Discharge port 16 ... Fixing hardware 17 ... uneven 18 ... projection 19 ... positioning spacer

Claims (2)

  This is a joint structure for joining a closed cross-section steel column and a closed cross-section steel column. Sleeves parallel to the column axial direction are spaced in the column circumferential direction on the inner surface of each joint end of the upper and lower closed cross-section steel columns. A closed cross section characterized in that the upper and lower portions of deformed steel bars are respectively inserted into the upper and lower sleeves of the upper and lower closed cross-section steel columns, and the upper and lower sleeves are filled with grout material. Joining structure of members. It is a joint structure for joining a closed cross-section steel column to a concrete member, and a plurality of sleeves parallel to the column axis direction are fixed to the inner side surface at the joint end of the closed cross-section steel column at intervals in the column circumferential direction, A closed cross-section member joining structure, wherein a tip end portion of a deformed steel bar whose base portion is embedded and fixed in a concrete member is inserted into the sleeve, and a grout material is filled in the sleeve.

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