JP7234488B2 - Two-layer structure roof and method for repairing existing structure - Google Patents

Description

The present invention relates to a roof made of concrete and a method of repairing an existing structure using this roof.

There are various types of large-span roofs. For example, Patent Literature 1 discloses a membrane roof in which support cables are installed between columns provided at intervals, and a roof body made of a membrane material is attached to stiffening girders suspended and supported by the support cables. It is

On the other hand, there is a roof made of concrete, but it is difficult to make a large span roof because it is heavy.

JP-A-7-109851

In consideration of the above facts, the present invention aims to construct a large-span roof made of concrete.

A two-layer structure roof according to a first aspect has a curved wooden layer constructed between supporting portions, and a concrete layer formed on the upper surface of the wooden layer.

The two-layer structure roof according to the first aspect has a wooden layer and a concrete layer by having a wooden layer that is curved between supporting parts and a concrete layer that is formed on the upper surface of the wooden layer. The roof part to be installed becomes lightweight and can be made into a large span. That is, a large-span roof made of concrete can be constructed.

Further, by using the wooden layer as a formwork, it is possible to reduce the time and effort required for the formwork work for forming the concrete layer.

A method for repairing an existing structure according to a second aspect is the method for repairing an existing structure in which an existing roof provided on the existing structure is dismantled and a two-layer structure roof is constructed according to the first aspect, wherein After the roof is dismantled, the column members arranged under the existing roof are removed to form a room space.

In the method for repairing an existing structure according to the second aspect, after the existing roof is dismantled, the column members arranged under the existing roof are removed to form a room space, so the existing roof is supported. A room space can be formed without reinforcing the structural frame. In other words, it is possible to reduce the time and effort required to reinforce the structural frame that constitutes the existing structure, form a room space in the existing structure, and construct a double-layered roof.

In addition, by making the two-layer structure roof a roof with a large span, it is possible to enlarge the room space formed by removing the column members arranged under the existing roof.

Since the present invention is configured as described above, a large-span roof made of concrete can be constructed.

1 is a front cross-sectional view showing a two-layer structure roof according to an embodiment of the present invention; FIG. 1 is a front cross-sectional view showing a roof portion of a two-layer structure roof according to an embodiment of the present invention; FIG. 1 is a perspective view showing a two-layer structure roof according to an embodiment of the present invention; FIG. It is a front view which shows the existing structure which concerns on embodiment of this invention. FIG. 5(a) is a front cross-sectional view showing a supporting section installation step and a wooden layer forming step of a method for repairing an existing structure according to an embodiment of the present invention, and FIG. 5(b) is an embodiment of the present invention. FIG. 5C is a front cross-sectional view showing a concrete layer forming step in a method for repairing an existing structure according to the present invention, and FIG. FIG. 5D is a front cross-sectional view showing a dismantling process, and FIG. 5D is a front cross-sectional view showing a room space forming process of the existing structure repair method according to the embodiment of the present invention. 1 is a perspective view showing a wooden layer according to an embodiment of the present invention; FIG. 7(a) and 7(b) are perspective views showing a plate member according to an embodiment of the present invention. It is sectional drawing which shows how to connect the plate members which concern on embodiment of this invention. FIG. 3 is a plan view showing a wooden layer according to the embodiment of the present invention; FIG. 4 is a perspective view showing a variation of the two-layer structure roof according to the embodiment of the present invention;

Embodiments of the present invention will be described with reference to the drawings. First, a two-layer structure roof according to an embodiment of the present invention will be described.

As shown in the front cross-sectional view of FIG. 1, the two-layer structure roof 10 has a roof portion 46, and the roof portion 46 has a wooden layer 12 and a concrete layer 14. .

The double structure roof 10 is built on top of a reinforced concrete structure 16 . The structure 16 is built on the ground 18 and has a room space 20 formed in the center in plan view, and structures 16A and 16B arranged on the left and right sides of the room space 20. ing.

The structures 16A, 16B are configured with column members 22, beam members 24, floor slabs 26, and roof portions 28. As shown in FIG. The roof portion 28 is configured by including beam members 30 and roof slabs 32 supported by the beam members 30 . The column member 22, beam member 24, floor slab 26, beam member 30, and roof slab 32 are made of reinforced concrete. The two-layer structure roof 10 is provided so that the roof portion 46 covers the room space 20. - 特許庁

As shown in FIG. 1, the wooden layer 12 is formed of a LVL (Laminated Veneer Lumber) having a constant thickness, and is curved in an arc shape with a single curvature so as to protrude upward. LVL is a wooden material (so-called laminated veneer lumber) obtained by laminating and bonding lumbered veneers with their fiber directions aligned.

A plurality of pillars 34 and 36 as supporting portions are arranged in the girder direction of the structure 16 (horizontal direction orthogonal to the inter-beam direction 38), and the pillars are positioned at the outer periphery of the room space 20 formed in the structure 16. It is erected on the member 22 . A wooden layer 12 is laid between the support 34 and the support 36 .

As shown in the front cross-sectional views of FIGS. 1 and 2, the concrete layer 14 is formed integrally with the wooden layer 12 with reinforced concrete on the upper surface of the wooden layer 12 . Top reinforcements 40 and 42 are embedded near the top surface of the concrete layer 14 at the ends and top.

The wood layer 12 has a constant thickness in the circumferential direction 44, and the concrete layer 14 gradually increases in thickness from top to end, with the thickness at the end increasing to the thickness at the top. It's bigger than it is. Thus, the roof portion 46 forms a shell structure with thick ends and thin top portions.

As shown in the perspective view of FIG. 3, the two-layered roof 10 has two shell structures 48 and 50 (roof sections 46) with respect to the girder direction 56 of the structure 16 (horizontal direction orthogonal to the inter-beam direction 38). It is formed in a row. The edges of the shell structures 48, 50 are provided with ribs 52, 54 to smoothly channel the principal stresses induced in the roof section 46 to the stanchions 34, 36 (see FIG. 1). be able to.

Next, a method for repairing an existing structure using the two-layer structure roof 10 will be described.

Here, a room space is formed in a structure 60 as an existing structure built on the ground 58 shown in the front view of FIG. An example of the repair method of the existing structure that constructs is shown.

The structure 60 includes a column member 62, a beam member 64, a floor slab 66, and a roof portion 68 as an existing roof portion. The roof portion 68 is configured by including a beam member 70 and a roof slab 72 supported by the beam member 70 . The structure 60 is a reinforced concrete building, and the column member 62, the beam member 64, the floor slab 66, the beam member 70, and the roof slab 72 are made of reinforced concrete.

In the method of repairing an existing structure, first, as shown in the front cross-sectional view of FIG. 74 (see FIG. 5(d)). A plurality of struts 34 and 36 are arranged in the girder direction of the structure 60 (horizontal direction orthogonal to the inter-beam direction 76).

Next, as shown in the front view of FIG. 5( a ), in the step of forming a wooden layer, a shoring 78 made of scaffolding or the like is installed on the roof slab 72 , and the timber is temporarily supported by the shoring 78 . A layer 12 is formed and the wooden layer 12 is installed between the pillars 34 and 36 .

Next, as shown in the front cross-sectional view of FIG. 5B, in the step of forming a concrete layer, the wooden layer 12 is used as a formwork, and concrete is placed on the wooden layer 12 to form a concrete layer 14 .

Next, as shown in the front cross-sectional view of FIG. 5(c), in the shoring removal step, after the concrete layer 14 has hardened and the roof portion 46 has been constructed, the shoring 78 is removed.

Next, as shown in FIG. 5(c), in the existing roof portion dismantling process, the roof portion 46 is located below the room space 74 (see FIG. 5(d)) that will be formed later. The located roof portion 68 provided on the structure 60 (hereinafter referred to as “roof portion 68A (see FIG. 5B)”) is dismantled.

Next, after the roof portion 68A is dismantled, as shown in FIG. 5(d), the column members 62, the beam members 64, and the floor slabs 66 that were arranged below the roof portion 68A are removed in the room space forming step. is removed to form a room space 74 in the central portion of the structure 60 in plan view. In FIG. 5(d), a room space 74 is formed by removing the column members 62, the beam members 64, and the floor slabs 66 on the 1st to 4th floors.

Thereby, the structure 60 is configured to have a room space 74 and structures 60A and 60B arranged on the left and right sides of the room space 74 . Then, the two-layer structure roof 10 is constructed on top of the structure 60 so as to be constructed between the structure 60A and the structure 60B.

Next, the operation and effects of the two-layer structure roof according to the embodiment of the present invention will be described.

In the two-layer structure roof 10 of this embodiment, as shown in FIG. 14, the roof portion 46 can be made lightweight and have a large span. That is, a large-span roof made of concrete can be constructed.

In addition, in the two-layer structure roof 10 of the present embodiment, as shown in FIG. 5B, by using the wooden layer 12 as a formwork, the time and effort of the formwork work for forming the concrete layer 14 can be reduced. can do. In addition, since the wooden layer 12 used as the formwork becomes the roof part 46 as it is, it is possible to save the trouble of dismantling the formwork.

Furthermore, in the two-layer structure roof 10 of the present embodiment, as shown in FIGS. 1 and 2, the wooden layer 12 has a constant thickness in the circumferential direction 44, and the concrete layer 14 extends from the top to the end. The roof portion 46 is a shell structure with a thicker end and a thinner top by gradually increasing the thickness toward the end and making the thickness of the end greater than the thickness of the top. can be done. The thickness of the wooden layer 12 is gradually increased from the top to the end, and the thickness of the end is made larger than the thickness of the top. A thick shell structure with a thin top thickness may be used.

Next, the operation and effects of the existing structure repair method according to the embodiment of the present invention will be described.

In the method for repairing an existing structure of the present embodiment, as shown in FIGS. 5(c) and 5(d), after the roof 68A as the existing roof is dismantled, the roof 68A is arranged below the roof 68A. Since the column member 62, the beam member 64, and the floor slab 66 are removed to form the room space 74, the room space 74 is formed without reinforcing the structural framework (the column member 62) that supports the roof portion 68A. be able to. That is, it is possible to form the room space 74 in the structure 60 by reducing the labor for reinforcing the structural skeleton (the column member 62) that constitutes the structure 60, and to construct the two-layer structure roof 10 as a new roof portion. .

In addition, in the method for repairing an existing structure according to the present embodiment, as shown in FIGS. The room space 74 formed by removing the column member 62, the beam member 64, and the floor slab 66 arranged under the roof portion 68A can be enlarged.

Furthermore, in the method for repairing an existing structure of this embodiment, as shown in FIGS. , the two-layer structure roof 10 can be constructed efficiently and safely.

The embodiments of the present invention have been described above.

In addition, in the two-layer structure roof 10 of this embodiment, as shown in FIG. It may be constructed on the structure 16 of the original structure 16, or may be constructed on the structure 16 that has been refurbished or the structure 16 that is to be refurbished.

When constructing the two-layer structure roof 10 on the upper part of the newly constructed structure 16, for example, first, the structures 16A and 16B shown in FIG. A wooden layer 12 is installed on the . Next, by pouring concrete on the upper surface of the wooden layer 12, the concrete layer 14 is formed integrally with the wooden layer 12 to form the roof portion 46, and the two-layer structure roof 10 is constructed on the upper portion of the structure 16. .

Further, in the two-layer structure roof 10 of the present embodiment, as shown in FIGS. 1 and 2, an example in which the wooden layer 12 is formed of LVL is shown, but the wooden layer 12 may be formed of a wooden board. . For example, the wooden layer 12 may be formed of CLT (Cross Laminated Timber). CLT is a panel material (so-called cross-laminated lumber) in which sawn boards are laminated and bonded so that their fiber directions are perpendicular to each other.

Furthermore, in the two-layer structure roof 10 of the present embodiment, as shown in FIGS. 1 and 2, an example in which the wooden layer 12 is formed by LVL is shown. They may be formed together.

The perspective view of FIG. 6 shows an example of a wooden layer 82 formed by connecting substantially triangular wooden plate members 80 made of LVL. As shown in the perspective view of FIG. 7( a ), a wooden square member 86 is attached to the upper surface of the plate member 80 with an adhesive or the like so that one end portion 84 protrudes outward from the plate member 80 . . For convenience of explanation, the square bar 86 is omitted in FIG.

Then, as shown in the perspective view of FIG. 7B, the plate members 80 (hereinafter, the plate member 80 arranged on the left side will be referred to as the "plate member 80A" and the plate member 80 arranged on the right side will be referred to as the "plate member 80A"). 80B") are arranged side by side, and as shown in the cross-sectional view of FIG. The plate members 80B) are joined together.

As shown in the plan view of FIG. 9, the plate members 80 are preferably laid out so that the direction 90 of the principal stress generated in the wooden layer 12 substantially matches the fiber direction (not shown) of the plate members 80 .

Also, the plate members 80 may be joined together by something other than the square members 86 . If the plate members 80 are connected to each other by the square timber 86, the square timber 86 functions as a cotter, and the wooden layer 12 (the plate member 80) and the concrete formed on the upper surface of the wooden layer 12 (the plate member 80). Integration with layer 14 can be enhanced.

Moreover, in the two-layer structure roof 10 of this embodiment, as shown in FIG. Although an example in which the two-layer structure roof 10 is formed in this manner has been shown, the two-layer structure roof may be formed by connecting three or more shell structures. The perspective view of FIG. 10 shows an example in which three shell structures 48, 50, 92 are joined together to form a two-layer roof 96. As shown in FIG.

Furthermore, in the method for repairing an existing structure of the present embodiment, as shown in FIGS. , an example in which the roof portion 68A as the existing roof portion is dismantled after the construction of the two-layer structure roof 10 is completed, and the room space 74 is formed after the roof portion 68A is completely dismantled, but the existing roof portion is dismantled. Any procedure may be used as long as the room space is formed after the procedure. That is, it is sufficient that the existing roof is dismantled prior to the formation of the room space.

For example, a new roof section may be constructed, and after the construction of the new roof section is completed, the existing roof section may be dismantled, and room spaces may be sequentially formed from below the dismantled portion. Alternatively, for example, a new roof may be constructed, the existing roof may be dismantled after construction of the new roof is completed, and the room space may be formed after the dismantling of the existing roof is completed. . Further, for example, while the existing roof is dismantled, room spaces may be sequentially formed from below the dismantled portions, and after the formation of the room spaces is completed, the new roof may be constructed. Alternatively, for example, the existing roof may be demolished, the room space may be formed after the existing roof has been demolished, and the new roof may be constructed after the room space has been completely formed. Furthermore, for example, the existing roof may be dismantled, and after the dismantling of the existing roof is completed, the room space may be formed while constructing a new roof. Alternatively, for example, the existing roof may be demolished, a new roof may be constructed after the existing roof has been demolished, and the room space may be formed after the construction of the new roof is completed.

Further, in the two-layer structure roof 10 and the method for repairing an existing structure of the present embodiment, as shown in FIGS. , reinforced concrete, steel frame, steel reinforced concrete, CFT (Concrete-Filled Steel Tube), and mixed structures thereof.

Although the embodiments of the present invention have been described above, the present invention is by no means limited to such embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

10, 96 Two-layer structure roof 12, 82 Wood layer 14 Concrete layer 34, 36 Column (support part)
60 structures (existing structures)
62 Column member 68 Roof (existing roof)
74 room space

Claims (1)

In a method for repairing an existing structure, dismantling the existing roof provided on the existing structure and constructing a double-layered roof,
After dismantling the existing roof, removing the column members of the existing structure arranged below the existing roof to form a room space,
The two-layer structure roof is
a wooden layer that is laid between supporting parts newly installed on the column members of the existing structure located in the outer periphery of the room space and that curves upwardly;
a concrete layer formed on the upper surface of the wooden layer;
having
How to renovate existing structures.

Images