JP2010116694A - External wall structure of reinforced concrete construction for building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an external wall structure in the case of constructing an external wall of a steel construction building as an external wall of cast-in-place reinforced concrete construction. <P>SOLUTION: The external wall structure of reinforced concrete construction for the building is constructed by constructing the external wall of the building as the external wall 1 of cast-in-place reinforced concrete construction. The external wall 1 of cast-in-place reinforced concrete construction of a lower floor is constructed in a hanging state downward from an outward projected position of a floor slab 2 of reinforced concrete construction of an upper floor from the position of a peripheral beam 3, and the external wall 1 of reinforced concrete construction of the lower floor is isolated by forming a vertical slit 4 between itself and an outer peripheral end face of a floor slab 2' of reinforced concrete construction of the same lower floor. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention mainly belongs to the technical field of an outer wall structure when an outer wall of a steel structure building is constructed as a reinforced concrete outer wall (hereinafter sometimes referred to as an RC outer wall).

As for the outer peripheral wall when constructing a steel structure building, the opening is generally constructed as a glass wall, and most of the non-opening is constructed as a dry wall such as a curtain wall wall or an ALC plate.
This is because steel structures have a relatively low rigidity and require a considerable amount of deformation following performance on the outer wall. Therefore, when the outer wall is constructed as a highly rigid on-site reinforced concrete outer wall, it is necessary to solve the problems of stress concentration on the RC outer wall during horizontal load and eccentricity in the rigidity of the building. Moreover, if the on-site RC building outer wall is constructed by cutting off the steel structure so as not to cause stress concentration, water leakage may occur. For this reason, it has been considered difficult to construct the outer wall of a steel structure building as an on-site RC building outer wall.
On the other hand, when the outer wall of a steel structure building is constructed as a curtain wall wall, it has been pointed out that horizontal joints and vertical joints are unavoidably generated on the outer wall, and the design is impaired. Furthermore, when installing the outer wall of the curtain wall, there is a problem that it is necessary to secure a space for installing the lifting equipment for constructing the curtain wall wall and a waiting space for the transport vehicle etc. at the work site. It is rare.

Incidentally, as a prior art, the curtain wall structure disclosed in the following Patent Document 1 is constructed in such a manner that an in-situ RC floor slab is constructed on a steel beam and the outer wall is constructed with a prefabricated member such as a precast concrete plate. The outer periphery of the formwork where the cast RC floor slab is constructed is composed of a concrete retaining plate made of a thin iron plate, and after the placed concrete is hardened, the concrete retaining plate is bent and deformed to contact the inner surface of the outer wall. The stopper plate is filled with an elastic material or poorly mixed mortar, and the edges of the RC cast slab and the precast concrete outer wall slab are cut to form an outer wall structure capable of absorbing deformation of the steel structure.
However, the precast concrete outer wall slab attached to the steel beam with fasteners forms horizontal joints (and vertical joints not shown) as shown in FIGS. 1 to 4. There is. The presence of the joints is unavoidable to impair the design of the exterior of the building.

In the construction method of the reinforced concrete outer wall disclosed in Patent Document 2 below, since the reinforced concrete outer wall is constructed as a non-bearing wall, the RC outer wall is connected only to either the upper or lower floor beam, The sides are insulated by beams and slits, and slits are formed on both sides to insulate (edge cut) from the pillars, and each of the slits is closed with a filler. Therefore, the appearance of vertical joints and horizontal joints on the exterior of the building is inevitable, and the presence of the joints impairs the design of the exterior of the building.
Furthermore, Patent Document 3 discloses a mounting structure in the case of constructing a conventional on-site RC building outer wall in a steel structure building. That is, the upper part (upper side part) of the cast-in-place RC wall is connected to the steel frame so that horizontal displacement is possible, and the lower end part is fixed to the foundation of the steel frame (Claim 1), or the upper part of the cast-in-place RC wall A mounting structure is disclosed in which (upper side) is suspended and fixed to a steel frame, and a lower part thereof is connected to the steel frame so as to be capable of horizontal displacement. However, it is clear that the mounting structure in the case of constructing a conventional on-site RC building outer wall disclosed in Patent Document 3 is only the mounting structure on the first floor portion of the steel building ( Paragraph numbers 0001, 0011, 0012) of the publication.

Japanese Patent Publication No. 6-54034 JP-A-7-90961 JP 2005-220607 A

As seen in Patent Documents 1 to 3 above, steel-framed buildings require considerable deformation-following performance on the outer wall, while RC-structured outer walls have hitherto been matched to match the mismatch in nature. Various proposals have been made and implemented. However, it has not yet reached a satisfactory solution.
In other words, the curtain wall outer wall structure disclosed in Patent Document 1 cannot avoid the occurrence of joints, and there is a risk of water leakage. As described above, the presence of joints impairs the design of the exterior of the building. In addition, in order to construct the outer wall of the curtain wall, a temporary scaffolding for attaching the outer wall of the curtain wall, such as standardized precast concrete board, ALC board, extrusion molding cement board, metal wall board, etc., is installed. It is indispensable to secure a work space necessary for the work of hanging the curtain wall carried on the site from the ground, and unless these conditions are satisfied, there is no possibility of implementation.

In that respect, there is no problem of securing a work space at the site when constructing an on-site RC outer wall as in Patent Documents 2 and 3. However, as in Patent Document 2, the RC outer wall is insulated from the upper floor beam or the lower floor beam with slits, and both sides are also insulated with pillars and slits, and each slit is closed with a filler. , It does not solve the problem that joints impair the design of the building exterior.
Further, as disclosed in Patent Document 3, the upper part (upper side) of the RC cast outer wall is connected to the steel frame so that the horizontal displacement is possible, or the lower part is connected to the steel frame so that the horizontal displacement is possible. The outer wall mounting structure that fixes the opposite side is also a proposal, but because it is only the on-site RC outer wall mounting structure on the first floor of the steel structure building, the RC outer wall structure necessary for the steel structure building It must be said that the content is far from the expectations of free design and construction.

  An object of the present invention is to construct the outer wall of a steel building mainly, and in some cases, the outer wall of a reinforced concrete building or a steel reinforced concrete building as an on-site reinforced concrete outer wall. Providing RC exterior wall structure for buildings that satisfies the deformation following performance required for RC exterior walls and avoids the occurrence of joints in the exterior wall appearance, thereby improving the design of the exterior of the building and eliminating the risk of water leakage It is to be.

As means for solving the above-described problems of the prior art, the reinforced concrete outer wall structure of the building according to the invention described in claim 1 is:
In the outer wall structure in which the outer wall of the building is constructed as a reinforced concrete outer wall 1 made in the field,
From the position where the reinforced concrete floor slab 2 on the upper floor protrudes outward from the position of the outer beam 3, the on-site reinforced concrete outer wall 1 on the lower floor is constructed in a suspended state,
The reinforced concrete outer wall 1 of the lower floor is characterized in that a vertical slit 4 is formed between the outer peripheral end surface of the reinforced concrete floor slab 2 'of the lower floor and the edge is cut.

The reinforced concrete outer wall structure of a steel structure building according to the invention described in claim 2 is:
In the outer wall structure in which the outer wall of a steel structure building is constructed as a reinforced concrete outer wall 1 on site,
From the position where the reinforced concrete floor slab 2 on the upper floor protrudes outward from the position of the outer circumferential steel beam 3, the on-site reinforced concrete outer wall 1 on the lower floor is constructed in a suspended state,
The reinforced concrete outer wall 1 of the lower floor is characterized in that a vertical slit 4 is formed between the outer peripheral end surface of the reinforced concrete floor slab 2 'of the lower floor and the edge is cut.

The invention according to claim 3 is the reinforced concrete outer wall structure of the building according to claim 1 or 2,
The lower floor reinforced concrete floor slab 2 on the lower floor where the reinforced concrete floor slab 2 on the upper floor is hung downward from the position protruding outward from the position of the outer peripheral beam 3, and the reinforced concrete floor slab 2 'on the lower floor The outer peripheral end face is connected by an anchor reinforcing bar 5 penetrating a vertical slit 4 formed therebetween, and the vertical slit 4 is further closed by a filler 6.

The RC external wall structure of the building according to the first and second aspects of the present invention is the upper floor when the external wall of the building is constructed as the on-site reinforced concrete external wall 1 regardless of whether the building is a steel structure or not. The reinforced concrete floor slab 2 of the lower floor is constructed in a suspended state from the position where it protrudes outward from the position of the outer circumferential beam (outer circumferential steel beam) 3, and this reinforced concrete outer wall 1 No. 1 has a slit 4 in the vertical direction between the outer peripheral end surface of the reinforced concrete floor slab 2 'on the lower floor and is edge-cut, so even if it is a highly rigid RC outer wall 1, the steel frame building has an outer wall Since the substantial deformation follow-up performance required for the above is sufficiently and sufficiently accommodated by the edge cutting structure by the slit 4, the problem of stress concentration does not occur.
The vertical slit 4 is formed in the vertical direction between the reinforced concrete outer wall 1 suspended from the reinforced concrete floor slab 2 on the upper floor and the outer peripheral surface of the reinforced concrete floor slab 2 'on the lower floor. , It does not appear outside the building (appearance), and therefore, it has a design with no joints as the building exterior, giving a good aesthetic feeling.
And since it is the edge cutting structure by the vertical direction slit 4 hidden behind the RC building outer wall 1, there is almost no fear of water leakage by rainwater. In addition, if the vertical slit 4 is filled with an elastic filler such as rock wool or a poor blending mortar as in the invention described in claim 3, the concern about leakage due to rainwater can be completely eliminated. .

As described above, the outer wall structure formed by the in-situ RC outer wall 1 according to the present invention can be implemented by completely solving the problem of the deformation following performance required by the steel building for the outer wall. Even if it is desired to construct the outer wall of the curtain wall, it can be easily implemented as an outer wall structure of a building that is constructed in a place where it is difficult to ensure the working conditions and environment of the site.
Furthermore, since the on-site RC structure outer wall structure according to the present invention has the above-described configuration, there is a degree of freedom to design and construct the RC structure outer wall structure on each floor of the building as necessary. This increases the degree of freedom and contributes to the improvement of design.

This is an outer wall structure in which the outer wall of the building is constructed as a reinforced concrete outer wall 1 made in the field.
From the position where the reinforced concrete floor slab 2 on the upper floor protrudes outward from the position of the outer circumferential beam 3, the on-site reinforced concrete outer wall 1 on the lower floor is constructed in a suspended state.
The lower-site cast-in-place reinforced concrete outer wall 1 has a configuration in which a vertical slit 4 is formed between the outer-layer end surface of the reinforced concrete floor slab 2 'on the lower floor and the edge is cut off.

Next, the present invention will be described based on illustrated embodiments.
First, FIG. 1 shows the appearance of a building in which an RC wall structure according to the present invention is implemented. The building of the present embodiment is a steel structure, and the outer peripheral wall portion of each floor of the building has a configuration in which the opening is configured with a glass wall 7 with good daylighting, and the on-site RC outer wall 1 is constructed on the blind wall portion. Show.
In the case of FIG. 1, the RC outer wall 1 is concentrated at one corner of the building, and is arranged on a plurality of floors in an up-and-down direction in an arrangement of one floor. However, as will be described later, the on-site RC building outer wall 1 can be freely designed and constructed on the part of the building outer wall as the blind wall portion as necessary. Moreover, the building structure is not limited to the steel structure. If necessary, it can be similarly applied to a reinforced concrete structure or a steel reinforced concrete structure building. The meaning and contents will be clarified by the following explanation.

FIG. 2 shows a cross-sectional view taken along the line II-II in the building outer wall portion of FIG.
In other words, an example of an outer wall structure in which the outer wall of a steel structure building is constructed as a cast-in-place reinforced concrete outer wall 1 is shown, and the reinforced concrete floor slab 2 on the upper floor (N + 1 floor) is located outside the position of the outer circumferential steel beam 3. The reinforced concrete outer wall 1 on the lower floor (N floor) is vertically suspended to the height level of the reinforced concrete floor slab 2 'on the lower floor (N floor). ing. The lower end of the reinforced concrete outer wall 1 on the lower floor is between the outer peripheral surface of the reinforced concrete floor slab 2 ′ on the same floor (N floor) and projecting outward from the position of the outer peripheral steel beam 3. The vertical slits 4 are formed so as to face each other in a structural manner.

  The lower end of the RC outer wall 1 is formed at substantially the same level as the lower surface of the reinforced concrete floor slab 2 'on the same floor (N floor). And the lower end part of the said RC building outer wall 1 is connected with the said reinforced concrete floor slab 2 'by the anchor reinforcing bar 5 bent at right angle, and is set as the structure which hold | maintains the integral relationship as a structure. Yes. The anchor reinforcing bar 5 is a reinforcing bar having an outer diameter of about 13 mm, and a portion embedded in the lower end portion of the RC outer wall 1 is covered with an edge-cutting material 8 such as a rubber tube to avoid adhesion to the concrete. The deformation tracking performance of the outer wall 1 is ensured. The anchor reinforcing bars 5 are arranged with a pitch of about 40 cm as an example in the plane direction of the RC outer wall 1 (direction perpendicular to the paper surface of FIG. 2).

Further, the vertical slit 4 formed by the RC outer wall 1 and the lower floor RC floor slab 2 'is, for example, an elastic filler such as rock wool, or a deformation follow-up performance of the RC outer wall 1 such as poor blending mortar. Is blocked by a filler 6 having a property that does not impede, preventing water leakage and ensuring confidentiality.
Therefore, the RC outer wall 1 according to the present invention sufficiently satisfies the requirement of the deformation follow-up performance of the outer wall required by the steel building with the flexibility in the vertical slit 4 portion, and does not generate stress concentration points. Of course, since the vertical slit 4 is not exposed to the exterior of the building, it does not hinder the design of the exterior of the building. And there is no problem with water leakage due to wind and rain because the vertical slit 4 is closed with the filler 6.

As described above, the RC external wall structure according to the present invention is configured between two reinforced concrete floor slabs 2 and 2 '(N + 1 floor and N floor slabs) adjacent to each other in the vertical direction. It is carried out freely regardless of.
That is, as shown in FIG. 2, not only the relationship between the slabs 2 and 2 'on the (N + 1) th floor and the Nth floor, but also between the RC slabs 2 and 2' on the (N-1) th floor and the (N-2) th floor. Next, from the position where the reinforced concrete floor slab 2 on the upper floor (N-1 floor) projects outward from the position of the outer peripheral steel beam 3, the reinforced concrete outer wall 1 on the lower floor (N-2 floor) Constructed by hanging vertically to the level of the reinforced concrete floor slab 2 'on the lower floor (N-2 floor), and the outer periphery of the reinforced concrete floor slab 2' on the lower floor (N-2 floor) It can implement similarly by the structure which forms the slit 4 of a perpendicular direction between the outer peripheral end surface which protruded outward rather than the position of the steel beam 3, and cuts off the edge, and makes it wrinkle.

Of course, the level where the RC wall 1 is installed and the position in the outer circumferential direction are not limited to the locations illustrated in FIGS. 1 and 2. The RC outer wall 1 is installed in a vertical arrangement in the vertical direction, but if the vertical position is shifted to the outer peripheral direction (horizontal direction) in FIG. 1, for example, the N floor and N− in FIG. It is possible to install the RC outer wall 1 on the first floor. And on this vertical line, it is also possible to install the RC outer wall 1 in an arrangement on the first floor.
In short, the RC building outer wall structure of the present invention can be installed as an on-site RC building outer wall at any desired position in the outer peripheral direction at all levels of the building, and has a degree of freedom in design and construction.
Furthermore, although FIG. 2 has shown the Example in case a building is steel frame construction, it is not this limitation. Even if the building is a reinforced concrete structure or a steel reinforced concrete structure, it can be implemented in exactly the same manner for the purpose of satisfying the deformation following performance of the outer wall required by the building.

  Although the present invention has been described above based on the illustrated embodiment, the present invention is not limited to the illustrated embodiment. It should be noted that the present invention extends to design changes, modifications, and application variations as required by those skilled in the art without departing from the object and spirit of the present invention.

It is a perspective view which shows the external appearance of the building which implemented RC structure outer wall structure by this invention. It is sectional drawing of the II-II line | wire arrow of FIG.

Explanation of symbols

1 On-site reinforced concrete outer wall (RC outer wall)
2, 2 'Reinforced concrete floor slab 3 Outer circumferential beam (steel beam)
4 Vertical slit 5 Anchor rebar 6 Filling material

Claims (3)

In the outer wall structure that builds the outer wall of the building as a reinforced concrete outer wall made in the field,
From the position where the reinforced concrete floor slab on the upper floor protrudes outward from the position of the outer beam, the outer wall reinforced concrete outer wall on the lower floor is constructed in a suspended state,
The reinforced concrete outer wall structure of a building, wherein the reinforced concrete outer wall of the lower floor is edged by forming a vertical slit between an outer peripheral end face of the reinforced concrete floor slab of the lower floor. In the outer wall structure that constructs the outer wall of the steel structure building as a reinforced concrete outer wall made in the field,
From the position where the reinforced concrete floor slab on the upper floor protrudes outward from the position of the outer steel beam, the on-site reinforced concrete outer wall on the lower floor is constructed in a suspended state,
Reinforced concrete outer wall structure of the steel building is characterized in that the lower floor reinforced concrete outer wall has a structure in which a vertical slit is formed between the outer peripheral end surfaces of the reinforced concrete floor slabs of the lower floor and is edged. .   What is the outer wall of the reinforced concrete floor slab on the lower floor where the reinforced concrete floor slab on the upper floor is hung downward from the position where it protrudes outward from the position of the outer beam, and the outer peripheral end surface of the reinforced concrete floor slab on the lower floor? The building according to claim 1, wherein the building is connected by an anchor reinforcing bar penetrating a vertical slit formed between the two, and the vertical slit is closed with a filler. Reinforced concrete exterior wall structure.

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