JP5656065B2 - Structural member of steel plate concrete structure - Google Patents

Description

  The present invention relates to a structural member having a steel plate concrete structure formed by filling concrete in an outer shell steel plate.

  As is well known, a steel plate concrete structure (SC structure) has a large number of studs in which the steel plate that forms the outer shell of the structural member is used as a mold, the concrete is filled in the outer shell plate, and is implanted on the inner surface of the outer shell plate. A structure in which the outer shell steel plate and the concrete are structurally integrated via bolts, and a robust structural member having a large cross section can be efficiently constructed. It is becoming popular as a structural form.

  Generally, when steel plate concrete structure is applied to a column beam frame, depending on the magnitude of the earthquake load and the shear span ratio of the member, for example, the bending moment generated in the column base part is particularly excessive, so that the allowable stress level is satisfied in the section verification. Therefore, measures such as sufficiently increasing the cross section of the entire structural member or increasing the thickness of the outer shell steel plate are required.

  On the other hand, regarding the steel plate thickness of steel plate concrete structure, in consideration of welding workability and the possibility of brittle fracture in “Guidelines for Steel Plate Concrete Structure Seismic Design / Building / Structure (JEAG4618: Electrical Technology Guide of NEC)” The maximum thickness is 40mm. Therefore, when the required steel plate thickness in the assumed member cross section exceeds 40 mm in the cross section verification, it is necessary to further increase the member cross sectional area so that the steel plate thickness is 40 mm or less and the allowable stress level is satisfied.

Japanese Patent No. 3309290

  As described above, in steel plate concrete structure, the maximum thickness of the steel plate is 40 mm, so if the required thickness of the steel plate is 40 mm or more, the entire cross section of the structural member is originally required. It must be larger than the cross section, which is a design difficulty.

  In general, in steel-plate concrete structures, it is necessary to plant a large number of stud bolts on the inner surface of the steel plate in order to securely and reliably integrate the steel plate and concrete, which requires a great deal of labor and expense. Therefore, it is said that there is room for improvement in the conventional steel plate concrete structure.

  In view of the above circumstances, the present invention can satisfy the allowable stress required for the structural member while limiting the required thickness of the steel sheet to 40 mm or less, and does not unnecessarily enlarge the cross section of the member. An object of the present invention is to provide a structural member having an effective and appropriate steel plate concrete structure having excellent properties.

The present invention relates to a steel plate formed by connecting the outer shell steel plates in the axial direction by abutting and joining the ends of the outer shell steel plates having a hollow closed cross section and filling the inside of the outer shell steel plates with concrete. A structural member of a concrete structure, wherein a reinforcing rib made of a perforated steel plate having a plurality of holes formed on the inner surface of the outer shell steel plate is welded along the axial direction and at least one of both outer shell steel plates to be joined The protruding portion of the reinforcing rib protruding from one outer shell steel plate by projecting the reinforcing rib in one outer shell steel plate from the end portion of the outer shell steel plate and abutting the end portions of both outer shell steel plates Is inserted into the other outer shell steel plate and the protruding portion is overlapped with the other reinforcing rib welded into the other outer shell steel plate in a state where both holes are aligned , edge Welding the cow, characterized in that the reinforcing ribs each other both formed by stress communicably joined through the concrete by filling concrete in both the outer shell in the steel sheet in this state.

  In the present invention, it is also conceivable to insert a penetrating rebar into both holes where the two reinforcing ribs are overlapped and matched.

The structural member of the present invention can satisfy the allowable stress level with the minimum necessary cross-section while restricting the thickness of the outer shell steel plate to 40 mm or less by providing reinforcing ribs on the inner surface of the outer shell steel plate, and requires a stud bolt. The number can be greatly reduced or omitted.
Moreover, by joining the reinforcing ribs made of perforated steel sheets in the form of lap joints, there is no need for complicated and troublesome work like when welding the reinforcing ribs directly or by joining high strength bolts. Therefore, it is possible to greatly improve the workability and economical efficiency of the structural member having the steel plate concrete structure.

  In particular, by penetrating through the reinforcing bars in the holes of the overlapped reinforcing ribs, the stress transmission effect can be further enhanced and the overlapping length can be shortened.

The embodiment of the structural member of the present invention is shown, and is a perspective view (partly perspective view) showing a state before and after joining outer shell steel plates. It is the plane sectional view and standing sectional view of a junction part. It is an enlarged view which shows the overlapping state of reinforcement ribs similarly. It is a figure which shows another example same as the above. BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view (partly perspective view) which shows the outline | summary of the structural member used as the foundation of this invention, and shows the state which welded and joined the outer shell steel plates and the reinforcement ribs. It is the plane sectional view and standing sectional view of a junction part.

Prior to describing the embodiments of the present invention, the prior art on which the present invention is based will be described with reference to FIGS.
This was previously proposed by the applicant as “steel plate concrete structure (Japanese Patent Application No. 2009-221785)”, and a plurality of pieces are provided on the inner surface of the outer shell steel plate 1 (three on each side of the outer shell steel plate 1 in the illustrated example). By welding the reinforcing ribs 2 of a total of 12 sheets and evaluating the cross-section of the reinforcing ribs 2 as a part of the outer shell steel plate 1, the thickness of the outer shell steel plate 1 is suppressed to 40 mm or less and effectively reinforced. Thus, performance that satisfies the allowable stress level can be ensured without enlarging the member cross section more than necessary.

  In this case, it is necessary to reliably integrate the reinforcing rib 2 with the concrete 3 filled in the outer shell steel plate 1. For this purpose, the reinforcing rib 2 is provided with engaging means such as a stud bolt or an auxiliary rib steel plate. It is conceivable to securely engage with concrete. However, as shown in FIG. 5, a large number of holes 2 a formed in the reinforcing rib 2 are naturally engaged by using a perforated steel plate as the reinforcing rib 2. Therefore, it is not necessary to provide special engagement means such as a stud bolt or an auxiliary rib steel plate, and in the case of a conventional general steel plate concrete structure, it is necessary to install a large number on the inner surface of the outer shell steel plate 1. The required number of stud bolts can be greatly reduced or omitted.

From the above, the above steel plate concrete structure is sufficiently effective and is expected to spread in the future, but there is still room for improvement in the following points.
That is, when a steel plate concrete structure is applied to a long structural member such as a column or beam, for example, when a steel plate concrete structure column is to be constructed as shown in FIG. It is common that the parts are butted together and the outer peripheral parts are welded over the entire circumference and joined in the axial direction, and then the entire interior is filled with concrete 3, in which case the outer shell steel plate as described above When reinforcing ribs 2 are provided in 1, when reinforcing ribs 2 are welded in advance to the inner surfaces of both outer shell steel plates 1 to be joined, the ends of both outer shell steel plates 1 are brought into contact with each other. At the same time, both the reinforcing ribs 2 are abutted against each other, and the ends of the reinforcing ribs 2 are also welded in the same manner.

Therefore, not only a welding operation for welding the reinforcing ribs 2 in the outer steel plate 1 is required, but also a welding line for welding the outer steel plates 1 and the welding for welding the reinforcing ribs 2 together. Since the lines intersect, welding work becomes complicated and high construction quality control is unavoidable.
In addition, it is not considered that high-strength bolts are joined instead of welding the outer shell steel plates 1 and the reinforcing ribs 2 together. Since they are complicated and interfere with each other, there is no great difference in terms of workability from welding.

  Accordingly, the present invention greatly simplifies and rationalizes the joining operation of the outer shell steel plates 1 when the reinforcing rib 2 is provided on the inner surface of the outer shell steel plate 1 by improving the joining method of the reinforcing ribs 1. Embodiments of the present invention will be described below with reference to FIGS.

  In the present embodiment, when the reinforcing ribs 2 are provided on the inner surface of the outer shell steel plate 1 as described above, both the reinforcing ribs 2 in the outer shell steel plates 1 to be joined are directly welded or high strength is provided. Instead of bolt joining, the main purpose is to use a perforated steel sheet as the reinforcing rib 2 and to join it by a so-called lap joint method.

  That is, in this embodiment, as shown in FIG. 1, both outer shell steel plates to which the reinforcing ribs 2 are to be joined by using a strip-like perforated steel plate in which a large number of holes 2a are formed as the reinforcing ribs 2 The reinforcing ribs 2 provided on one of the outer shell steel plates 1 (the lower side in the illustrated example) are welded in advance to the inner surface of 1 at predetermined positions along the axial direction at predetermined intervals. The front end (upper end) is protruded above the end (upper end) of the outer shell steel plate 1 by a predetermined dimension (a dimension corresponding to a lap length sufficient to function as a lap joint).

Further, the reinforcing rib 2 provided on the other (upper example in the figure) outer shell steel plate 1 to be joined to the outer shell steel plate 1 may be simply installed inside the outer shell steel plate 1 without protruding. However, as shown in FIG. 1B and FIG. 2, the protruding portion of one reinforcing rib 2 naturally overlaps the other reinforcing rib 2 in a state where the end portions of both the outer shell steel plates 1 are in contact with each other. Keep it like that.
For that purpose, the installation position of the reinforcing rib 2 with respect to the other outer shell steel plate 1 is shifted by an amount corresponding to the thickness dimension of the reinforcing rib 2 with respect to the installation position of the reinforcing rib 2 with respect to one outer shell steel plate 1. good. In other words, the positions of both reinforcing ribs 2 may be set in advance so that the axial lines of both outer shell steel plates 1 naturally coincide with each other by overlapping the two reinforcing ribs 2 with each other. As a result, both the reinforcing ribs 2 also function as erection pieces when the outer shell steel plate 1 is constructed. Therefore, it is not necessary to provide a special erection piece, and it is possible to omit it.

  Further, in the state where the two reinforcing ribs 2 are overlapped with each other, as shown in FIG. 3, the diameter and position of each hole 2a so that the positions of the holes 2a formed in both the reinforcing ribs 2 naturally match each other. And the interval are set in association with each other.

After the end portions of the outer shell steel plate 1 are butted together and the reinforcing ribs 2 are overlapped in this manner, the end portions of the outer shell steel plate 1 are welded over the entire circumference, and then the entire inner surface of the outer shell steel plate 1 is formed. If the structural member is constructed by filling the concrete 3, both the reinforcing ribs 2 are structurally joined via the concrete 3 in the form of lap joints.
That is, even if both reinforcing ribs 2 are not directly joined to each other by a technique such as welding joining or high-strength bolt joining as usual, both reinforcing ribs 2 are placed around them by simply overlapping them. Due to the adhesive strength of the concrete 3 to be filled and the shear strength of the concrete 3 that has entered both the holes 2a, the concrete 3 is firmly joined in a state where stress can be transmitted.

  Therefore, the structural member of the present invention is the minimum necessary while limiting the thickness of the outer shell steel plate 1 to 40 mm or less by providing the reinforcing ribs 3 in the outer shell steel plate 1 as shown in FIGS. The cross-sectional area can satisfy the allowable stress level, and the required number of stud bolts can be greatly reduced or omitted, as well as when the reinforcing ribs 2 are directly welded or joined with high-strength bolts. Since it is only necessary to join the outer shell steel plates 1 without requiring such a complicated and troublesome work, the workability and economical efficiency of the construction of the steel plate concrete structure can be greatly improved.

If both reinforcing ribs 2 are overlapped and then the penetrating reinforcing bars 4 are arranged in all or a part of the holes 2a as shown in FIG. 4, for example, the stress transmission effect can be further enhanced. The length can be shortened.
Further, as described above, it is preferable that the two reinforcing ribs 2 are overlapped with each other in a close contact state, whereby the function of the erection piece can be provided, but this is not necessarily the case, and the reinforcing ribs 2 are in close contact with each other. When a desired joint strength can be ensured without overlapping (that is, when it can function as a so-called perforated lap joint), it is allowed to overlap both reinforcing ribs 2 with a slight gap therebetween. .

  In any case, the overlap length of the reinforcing ribs 2 may be set so that it effectively functions as a lap joint or a lap joint so as to obtain a desired stress transmission effect. What is necessary is just to set optimally also considering the magnitude | size of the hole 2a formed in the reinforcement rib 2, and those space | intervals as well as a number, installation space | interval, and the intensity | strength of concrete 3. FIG.

If necessary, the reinforcing ribs 2 in the lower outer steel plate 1 are protruded upward as in the above-described embodiment, and are provided on the upper outer steel plate 1 as indicated by a chain line in FIG. The lower end portion of the reinforcing rib 2 may be protruded downward, and the tip end portion (lower end portion) may be overlapped with the lower reinforcing rib 2 in the lower outer shell steel plate 1.
Of course, instead of projecting the upper end of the reinforcing rib 2 provided on the lower outer steel plate 1 upward as in the above embodiment, the reinforcing rib provided on the upper outer steel plate 1 with the whole top and bottom reversed. The same applies to the case where the lower end portion of 2 is protruded downward and the reinforcing rib 2 of the lower shell steel plate 1 is not protruded.

  Furthermore, although the said embodiment is an example applied to the column of a steel plate concrete structure, it cannot be overemphasized that this invention can be similarly applied not only to a column but to a beam and other structural members.

1 Outer steel plate 2 Reinforcing rib (perforated steel plate)
2a hole 3 concrete 4 penetrating rebar

Claims (2)

The steel plate concrete structure is formed by connecting the outer steel plates in the axial direction by abutting and joining the ends of the outer steel plates with a hollow closed cross section and filling the inside of the outer steel plates with concrete. A structural member,
Welding a reinforcing rib made of a perforated steel sheet having a large number of holes formed on the inner surface of the outer shell steel sheet along the axial direction;
The reinforcing ribs of at least one of the outer shell steel plates to be joined are protruded from the end portions of the outer shell steel plates, and the end portions of both outer shell steel plates are brought into contact with each other. Insert the protrusion of the reinforcing rib protruding from the outer steel plate into the other outer steel plate, and match the position of both holes to the other reinforcing rib welded into the other outer steel plate In a state where
Welding the ends of the outer shell steel plates,
A structural member having a steel plate concrete structure in which both the reinforcing ribs are joined to each other through the concrete by filling the outer shell steel plates with concrete in that state. It is a structural member of the steel plate concrete structure according to claim 1,
A structural member of a steel plate concrete structure, characterized in that a penetration reinforcing bar is inserted into both holes in which both reinforcing ribs are overlapped and matched.

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