JPH1150527A - Inverted beam construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the quality of a structure sufficiently in terms of accuracy and bearing strength, to allow easy construction work, and to ensure that construction work is achieved in a short time without skilled specialists. SOLUTION: In an inverted beam construction method, a span-direction beam 2 and a ridge-direction beam 3 are made of precast concrete, and the span- direction beam 2 is placed on the top of a column 1 for which concrete placing is already complete up to the lower end of the beam. After the ridge-direction beam 3 is installed, the upper-end main reinforcement 2i of the span-direction beam 2 is connected to anchor reinforcement 2b inserted into the column 1 on-site, and cast-in-place concrete is placed at the column-to-beam junction, a cut 2g in the top of the end of the span-direction beam 2, the ridge-direction- beam-to-beam junction, and the junction of peripheral fixed floor boards, to construct a structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called reverse beam construction method having a floor plate below a beam of a building structure, and more particularly to a reverse beam construction method in which a beam and a floor plate are constructed of precast concrete.

[0002]

2. Description of the Related Art When a structure such as an apartment house is constructed by a reverse beam method, underfloor storage, underfloor refrigerator, underfloor exhaust, underfloor equipment piping, underfloor electrical wiring, and the like can be freely provided, and the life of the structure can be reduced. In addition, it is possible to freely change the floor plan of each house, thereby expanding the application range of the building in terms of software.

[0003] Such a reverse beam construction method has been carried out by a so-called conventional construction method in which each structural member is constructed of cast-in-place concrete, but compared with a conventional construction method of a so-called forward beam having a floor plate above a beam. The reverse beam method had various problems in quality control and process control. For example, it is desirable that a beam, which is a main member of a structure, be not provided with a horizontal seam of concrete inside the beam in order to ensure its strength. Therefore,
When building a reverse beam by the conventional method, it was necessary to construct the floor plate and the beam at the same time.

[0004]

In the conventional reverse beam method,
Since the side formwork of the beam is a floating formwork, it was very difficult to secure the accuracy of building and street. In addition, there was a disadvantage that the number of days required for formwork assembly was increased as compared with the forward beam. In addition, the method of casting concrete is also difficult, and it was not possible to construct a highly accurate skeleton without arranging skilled workers. In the case of the inverted beam structure using the conventional construction method that requires a floating form as described above, many complicated works by skilled workers are inevitable, so it is difficult to achieve this even if aiming for labor saving and rationalization. Was.

[0005] In addition, as shown in FIG. 22 (a), for example, as shown in FIG. 22 (a), when a precast concrete girder beam 101 and a floor plate 102 integrally formed with a cantilever floor plate 100 are joined together, And the floor plate 102 are provided with connecting reinforcing bars 103 and 104 protruding therefrom.
It is conceivable to construct a structure by casting cast-in-place concrete at the joint between the base material 01 and the floor plate 102. However, since there are many cast-in-place portions, it takes time and effort to formwork.

Further, as shown in FIG. 22 (b), when a precast concrete plate 101a for a form is protruded below a beam of the girder direction beam 101, a form member becomes unnecessary. The production of 101 is complicated and there is a problem in transportation.

Further, as shown in FIG. 22 (c), when a floor plate 102 made of semi-precast concrete is used, a reinforcing bar 110 is arranged on the floor plate 102 and cast-in-place concrete is cast. Because there are many
It takes time to formwork.

Further, as shown in FIG.
20 is made of precast concrete in which a plurality of sheath pipes 121 penetrating vertically are buried, and a vertical reinforcing bar 123 of the precast concrete multi-story shear wall 122 is inserted into these sheath pipes 121 to arrange the inter-beam direction beams 120. The sleeve joint 124 of the precast concrete multi-story anti-seismic wall 122 is inserted into the tip of the vertical reinforcing steel bar 123 projecting from the upper surface of the inter-beam direction beam 120, and then grout material is injected and fixed. This beam 120 between beams
When the structure is constructed by casting concrete in place at the joint between the beam 120 and the floor plate 102 by constructing the joint between the beam 120 and the floor plate 102, the precast concrete multi-story shear wall 122 In addition, the overall length including the vertical reinforcing bar 123 is L1 and is large, which is problematic in terms of transportation. In addition, since there are many cast-in-place parts, it takes time to perform the formwork work.

[0009] The present invention solves the above-mentioned problems, and claims 1
According to the invention as set forth in claim 5, the quality of the structure can be sufficiently ensured in terms of accuracy and proof stress, and the construction is easy, and the structure can be surely obtained in a short period of time without any skilled specialist. In the invention according to claims 6 to 10, in addition to the above objects, it is possible to reduce the formwork of the cast-in-place concrete part, and furthermore, the transportation and the construction are easy, It is an object of the present invention to provide a reverse beam construction method that can surely construct a structure in a short period of time without any specialized construction work.

[0010]

Means for Solving the Problems In order to solve the above problems and achieve the object, the present invention has the following constitution.

According to a first aspect of the present invention, there is provided a reverse beam construction method having a peripheral fixed floor plate and a cantilever floor plate below a beam between beams and a beam in a girder direction. It is made of semi-precast concrete in which the connecting rebar is projected from the lower end of the beam end to project from the lower end of the lower end of the beam to anchor it to the column, and the upper main notch from the upper end of the beam end is projected to the front of the column. On the other hand, the beam in the girder direction is made of precast concrete in which connecting reinforcing bars for peripheral fixed floor plates are protruded on the lower side surfaces of the beams, and the peripheral fixed floor plates further protrude reinforcing bars for lap joints connected to these connecting reinforcing bars. A floor plate made of precast concrete, using these members, the inter-beam direction beam is placed on the top of a column that has already been concreted to the lower end of the beam, and After installing the girder beam, connect the upper main reinforcement of the inter-beam to the anchor reinforcement for insertion into the column to be inserted at the site, and connect the column / beam joints and the beam end upper notch of the inter-beam. A reverse beam method characterized by constructing a structure by casting cast-in-place concrete at the beam-to-beam beam-to-beam joint and the joint between the fixed floor slabs. ].

According to the first aspect of the present invention, in the reverse beam construction method having a peripheral fixed floor plate and a cantilever floor plate below the beam between the beams and the girder beam, the beam between the beams is peripherally fixed to the side surface of the lower portion of the beam. Made of semi-precast concrete with projecting reinforcing bars for floorboards, projecting from the lower end of the beam end to anchor the lower main bar to the column, and projecting the upper main bar from the notch at the upper end of the beam to just before the column. On the other hand, the beam in the girder direction is made of precast concrete in which connecting reinforcing bars for peripheral fixed floor plates are protrudingly provided on the lower side surfaces of the beams, and the peripheral fixed floor plates protrude reinforcing bars for lap joints connected to these connecting reinforcing bars. Precast concrete floorboard to be installed, using these members, the inter-beam direction beam is already placed on the top of the column where concrete casting has been completed to the beam lower end, After installing the girder beam, connect the main reinforcement at the top of the beam between beams and the anchor bar for anchoring in the column to be inserted at the site, and connect the column / beam joints and the beam end of the beam between beams. The structure is constructed by casting cast-in-place concrete at the notch, the beam-to-beam beam-to-beam joint, and the joint of the peripheral fixed floor plate.

The pillars of the structure constructed by the reverse beam method may be made of precast concrete or cast-in-place concrete. The beam between beams and the beam in the direction of the beams are made of precast concrete, and the beam between beams is placed on the top of the column where concrete casting has already been completed to the lower end of the beam,
Next, after installing the girder beam, connect the main reinforcement at the top of the beam between beams and the anchor bar for anchoring in the column to be inserted at the site, and connect the column / beam joints and the upper end of the beam end of the beam between beams. Since cast-in-place concrete is cast at the girder beam-to-beam joints and peripheral fixed floor slab joints, there is no need for cumbersome assembling of the floating formwork or difficult concrete casting, and the installation and passage of beams The concrete beam can be accurately formed, and since the beam does not have a horizontal seam of concrete, sufficient strength can be ensured. In addition, the inter-beam direction beam is provided with a notch at the top of the beam end, and the upper end main bar protrudes only up to the column, so that the girder beam can be dropped.
The joint work at the beam joint can be greatly reduced.

According to a second aspect of the present invention, there is provided the inverted beam method according to the first aspect, wherein the cantilever floor plate is made of precast concrete integrally formed with the girder beam. ].

According to the second aspect of the present invention, in the case of a structure having a floor plate that rebounds from the outer surface of the column, the cantilever floor plate is made of precast concrete integrally with the girder beam.

According to a third aspect of the present invention, the cantilever beam is made of precast concrete which is integrally formed with the cantilever floor plate and protrudes from the beam end to the front of the pillar so as to anchor the main bar to the pillar. 3. The structure according to claim 2, wherein the main reinforcement is connected to an anchor reinforcement anchoring in a column to be inserted at the site, and a cast-in-place concrete is poured into the column / beam joint to construct a structure. Reverse beam method described. ].

According to the third aspect of the present invention, in the case of a structure having a floor plate that protrudes long on the outer surface of the column, the cantilever is integrated with the cantilever floor plate, and the protruding length of the cantilever floor plate is provided. Even when the length is long, the proof stress can be sufficiently secured.

According to a fourth aspect of the present invention, there is provided a method as set forth in any one of the first to third aspects, wherein the inter-beam direction beam and the girder direction beam are formed by projecting a precast concrete plate for formwork below the beam. Reverse beam construction method described in Crab. ].

According to the fourth aspect of the present invention, the floor plate for fixing the periphery by cast-in-place concrete requires a formwork support on the lower surface. By projecting below the beam of the direction beam, a mold member is not required.

According to a fifth aspect of the present invention, there is provided a method according to the invention, wherein said beam between beams is provided with a shear cotter for connecting a precast concrete multi-story shear wall on the upper and lower surfaces thereof, and embeds a plurality of sheath pipes penetrating vertically. Is made of precast concrete, which is used to drill concrete holes into the vertical joints between walls and columns, and after inserting the vertical reinforcement of the precast concrete multi-story shear wall into these sheath pipes, grout The reverse beam method according to any one of claims 1 to 4, wherein the fixing is performed by injecting. 』
It is.

According to the fifth aspect of the present invention, in the case of a frame in which the earthquake-resistant wall is joined to the upper and lower surfaces of the beam between the beams, the earthquake-resistant wall and the frame beam are separated and made of precast concrete. At that time, a shear cotter is provided on each horizontal joint surface. In addition, a vertical joint is provided at the part where the earthquake-resistant wall and the column abut, and concrete is driven into the same part using the driving hole, and the vertical reinforcement of the earthquake-resistant wall is inserted through the sheath pipe of the frame beam and the upper part is inserted. Connect to the vertical reinforcement of the shear wall.

According to a sixth aspect of the present invention, there is provided an inverted beam construction method having a fixed floor plate and a cantilever floor plate below a beam between beams and a beam in a girder direction. The semi-precast concrete projecting only the connecting reinforcing bars of the beam, projecting only the lower main bar from the lower end of the beam end to anchor to the column, and protruding only the upper main bar from the notch at the upper end of the beam to the front of the column On the other hand, the girder row direction beam is made of precast concrete in which only a connecting reinforcing bar for a peripheral fixed floor plate is protruded on a lower side surface of the beam, and the peripheral fixed floor plate has a peripheral portion below the connecting reinforcing bar. A semi-precast concrete floorboard to be arranged in the above, using these members, the semi-precast concrete floorboard is arranged prior to the inter-beam direction beam and the girder direction beam. Then, the inter-beam direction beam is placed on the top of a column that has already been concretely cast to the lower end of the beam in advance, and after installing the girder direction beam, a reinforcing bar is placed on the semi-precast concrete floor plate. And place
The upper main reinforcement of the inter-beam direction beam is connected to the anchor reinforcement for anchoring in the column to be inserted at the site, and on the semi-precast concrete floor plate, the column / beam joint, the upper end of the beam end of the inter-beam direction beam A reverse beam method characterized by constructing a structure by casting cast-in-place concrete at a cut portion and a girder beam / beam joint. ].

According to the sixth aspect of the present invention, the connecting rebar projecting from the inter-beam and the girder beam is formed by constructing the semi-precast concrete floorboard prior to the inter-beam and the girder beam. Can be constructed without interruption.
In addition, semi-precast concrete floorboards are placed around the lower side of the connecting rebar, and rebars are placed on this floorboard and cast-in-place concrete is cast to construct a structure. Formwork for concrete parts can be reduced.

According to a seventh aspect of the present invention, there is provided the present invention, wherein the cantilever floor plate is a semi-precast concrete floor plate integrally formed with the girder beam. The method according to claim 6, wherein the structure is constructed by casting concrete. ].

According to the seventh aspect of the present invention, in the case of a structure having a floor panel that protrudes long on the outer surface of the column, the weight can be reduced by converting the cantilever floor panel into semi-precast concrete, and transportation and handling can be performed. Easy and can be used for balconies and corridors.

The invention according to claim 8 is characterized in that the cantilever floor plate is a precast concrete floor plate manufactured separately from the girder beam, and cast-in-place concrete is applied to the cantilever floor plate / girder beam joint. The inverted beam construction method according to claim 6, wherein the structure is constructed by casting. ].

According to the eighth aspect of the present invention, in the case of a structure having a floor plate that protrudes long on the outer surface of the column, the weight can be reduced by separately providing the cantilever floor plate and the beam in the girder direction, It is easy to transport and handle, and can be used for balconies and corridors.

According to a ninth aspect of the present invention, there is provided the present invention, wherein the cantilever floor plate is a semi-precast concrete floor plate manufactured separately from the girder beam, and a reinforcing bar is arranged on the cantilever floor plate. 7. The reverse beam construction method according to claim 6, wherein the structure is constructed by placing cast concrete. ].

According to the ninth aspect of the present invention, in the case of a structure having a floor plate that protrudes long on the outer surface of the column, the cantilever floor plate and the girder beam are separated from each other, and the cantilever floor plate is made of semi-precast concrete. By adopting this method, it is possible to reduce the weight, facilitate transportation and handling, and can be used for balconies and corridors.

According to a tenth aspect of the present invention, there is provided the above-mentioned beam-to-beam direction, wherein only a connecting reinforcing bar for a peripheral fixed floor plate is protrudingly provided on a lower side surface of the beam, and a shacotter for joining is provided on the lower surface thereof, and a plurality of sleeve joints are provided. And a vertical reinforcing bar extending upward from the sleeve joint and projecting from the upper surface of the inter-beam direction, and having a tip protruding from the upper surface. The pre-cast concrete to be pierced, the inter-beam direction beam is inserted into the end of the semi-precast concrete floorboard and inserted into the reinforcing steel of the precast concrete multi-story shear wall, and the semi-precast concrete is placed. Reinforcing steel is placed on a steel floorboard and cast-in-place concrete is cast. After inserting the sleeve joint of the catcher strike concrete Shear Walls, reverse beam method according to any one of claims 6 to 9, characterized in that constructing a structure fixed by injecting grout. ].

According to the tenth aspect of the present invention, in the case of a frame structure in which an earthquake-resistant wall is joined to the upper and lower surfaces of the beam between beams, the earthquake-resistant wall and the beam between beams are separated from each other and manufactured by precast concrete. The beam is placed on the end of the semi-precast concrete floorboard, the reinforcing steel is placed on this floorboard, and cast-in-place concrete is cast to construct the structure. Formwork for cast-in-place concrete can be reduced. Also, insert the sleeve joint of the inter-beam direction beam into the reinforcing steel of the lower precast concrete multi-story shear wall, and insert the sleeve joint of the precast concrete multi-story anti-seismic wall into the tip of the vertical reinforcing bar projecting from the upper surface of the inter-beam direction. It is a structure that joins the direction-between beams and the earthquake-resistant wall. By using the sleeve joint, it is possible to reduce the fault of the earthquake-resistant wall including the rebar and reduce the restrictions on transportation.

[0032]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view of a structure constructed by the inverted beam method according to the present invention, and FIGS. 2 to 6 are II-II of FIG.
It is sectional drawing which respectively shows a cross section, a III-III cross section, an IV-IV cross section, a VV cross section, and a VI-VI cross section. The main structural members of the structure shown in FIG. 1 are a column 1, an inter-beam direction beam 2, a girder direction beam 3, a peripheral fixed floor plate 4, and a cantilever floor plate 5.

The column 1 may be made of precast concrete or cast-in-place concrete, but has a height up to the bottom of the beam and a main bar 1a protruding from the top. The pillar 1 shown in FIGS. 1 and 2 is made of precast concrete. In this case, the pillar 11 on the upper floor is a grout-filled sleeve 1
Connected by b.

The inter-beam direction beam 2 is provided with a connecting reinforcing bar 2a for a peripheral fixed floor plate protruding from a lower side surface of the beam, and a lower main bar 2e is protruded from a lower end of the beam end so as to be anchored to the column 1, and a beam end is provided. It is made of semi-precast concrete in which the upper main bar 2i projects from the upper cut 2g to the front of the column 1. By providing an upper notch 2g at the beam end and projecting the upper main bar 2i up to just before the column 1, the joint 2c is provided before the column 1.
And the main reinforcement 3a of the beam 3 can be dropped. In addition, a shacotter 2d is formed on a vertical joint surface with the column 1.

The girder beam 3 is also made of precast concrete. A connecting reinforcing bar 3b protrudes from the lower side of the beam on the indoor side, but a special portion is provided near the column 1 where the intersecting beam 2a intersects with the connecting reinforcing bar 2a. The coupler 3c is embedded so that the connecting rebar can be screwed in after the beam is installed. Further, in a structure having a cantilever floor plate 5 such as a corridor or a balcony on the outer surface of the pillar 1, it is made of precast concrete integrally with the girder beam 3,
If the projecting length is long, the cantilever 5a is appropriately arranged.

The main bar 5b is projected from the beam end of the cantilever 5a to the column 1 so as to be anchored to the column 1, and the anchoring bar for fixing can be connected after the inter-beam 2 and the girder 3 are installed. The joint part 5e is provided as described above, and a shacotter 5c is formed on the vertical mating surface.

Further, joints 6 are provided at appropriate spans on members of the beam 3 and the cantilever floor plate 5, which are manufactured integrally, and main beams of the beams are connected by enclosure welding.
The joint 6 may be provided on the inter-beam direction beam 2.
In the case where a floor panel such as a balcony is provided on the wife's side of the structure, a cantilever floor panel is attached to the inter-beam direction beam 2 and integrally cast.

The peripheral fixed floor plate 4 constructed with the inverted beam structure on the indoor side of the structure is composed of a plurality of precast concrete floor plates 4a and a cast-in-place concrete floor plate 4b around its periphery. The precast concrete slab 4a is connected to the rebar 2
A lap joint reinforcing bar 4c connected to a and 3b is protruded from the outer peripheral surface. The cast-in-place concrete floor panel 4b is
a and 3b are connected to the lap joint reinforcing bar 4c, and the concrete is cast and constructed.
The precast concrete plate 7 for the formwork projecting from the lower part of the beam is used as the formwork.

In the case of constructing a reverse beam structure using the above structural members, the interbeam 2 is mounted on the top of the pillar 1 which has already been concreted to the lower end of the beam. After installing the girder beam 3, the upper main bar 2 i of the interbeam 2 is connected to the anchor bar 2 b for anchoring in the column 1 to be inserted at the site, and the column / beam joint, beam direction A cast-in-place concrete is poured into the beam end upper cut portion 2g of the beam 2, the beam-beam joint in the girder direction and the joint of the peripheral fixed floor plate to construct a structure.

The connecting reinforcing bars 2 projecting from the lower side surfaces of the inter-beam 2 and the girder 3 fixed in this manner.
a, 3b and the reinforcing steel bar 4c for the lap joint of the precast concrete slab 4a arranged inside are connected to construct a cast-in-place concrete slab 4b. As a result, the inner floor plate is fixed to the periphery and rigidly connected to each beam. By using a lap joint, it is possible to easily and inexpensively construct a floor plate having a reverse beam structure without requiring a special joint member.

Although the structure described above is an example of a so-called ramen frame, the inverted beam method of the present invention can be applied to a structure of a multi-story shear wall frame. An embodiment thereof will be described with reference to FIGS. FIG. 7 is a plan view of a structure constructed by the reverse beam method according to another embodiment, and FIGS. 8 and 9 are VI views of FIG.
It is sectional drawing which respectively shows II-VIII cross section and IX-IX cross section. In this embodiment, the configuration and operation of the other structural members except for the portion where the earthquake-resistant wall is present are the same as those of the above-described ramen frame, and thus the detailed description is given with the reference numerals used in FIGS. Is omitted.

The multi-story earthquake-resistant wall 8 is a frame beam 2 which is a beam between beams.
2 is a precast concrete structural member connected to the upper and lower surfaces, but since the weight of the precast member is generally limited, the frame beam 22 and the multi-story shear wall 8 are manufactured separately. The frame beam 22 is also made of precast concrete except for the upper portions at both ends, and a connecting reinforcing bar 2a having a predetermined length is protruded from the lower side surface. Also, cast-in-place concrete floor panel 4b
Precast concrete plate 7 for formwork for building concrete
Also project from the lower surface. In addition, the upper main bars 2b at both ends buried in the cast-in-place concrete are provided with joints 2c in front of the columns 21.

On the upper and lower surfaces of the frame beam 22, a shacotter 22a forming a horizontal joint with the earthquake-resistant wall is provided, and a plurality of sheath tubes 22b penetrating vertically are buried. Casting hole 2 for placing concrete in joints
2c is drilled. Further, a vertical joint 9 is provided between the column 21 and the multi-story earthquake-resistant wall 8, and a shacotter 9a is formed in each of the vertical joints 9.

A plurality of vertical reinforcing bars 8a protrude from the upper part of the multi-story earthquake-resistant wall 8, and these are inserted into the sheath tube 22b to inject a grout material to connect them. In addition, casting hole 2
Pour concrete into the vertical joint 9 from 2c,
Integrate the shear walls and frame beams. The vertical reinforcement 8a is connected to the multi-story earthquake-resistant wall 18 on the upper floor by a grout-filled sleeve 8b in the same manner as the column main reinforcement.

Next, another embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 10 is a plan view of a structure constructed by the inverted beam method according to the present invention, and FIGS.
It is sectional drawing which shows the -XI cross section, the XII-XII cross section, and the XIII-XIII cross section, respectively.

In this embodiment, the same components as those shown in FIGS. 1 to 6 are denoted by the same reference numerals, and description thereof will be omitted.
In the inter-beam 2, only the connecting reinforcing bar 2 a for the peripheral fixed floor plate is protruded from the lower side of the beam, and the lower main bar 2 e is protruded from the lower end of the beam so as to anchor to the column 1, and the upper end of the beam is cut. It is made of semi-precast concrete in which the upper main bar 2i is protruded from the portion 2g to the front of the column 1. Girder beam 3
Is also made of precast concrete, and only the connecting reinforcing bar 3b protrudes from the lower side surface of the beam on the indoor side, but a special coupler 3c is buried in a portion near the column 1 where the connecting beam 2a of the inter-beam direction beam 2 intersects. After the beam is installed, the connecting rebar can be screwed. The peripheral fixed floor plate 4 constructed with the inverted beam structure on the indoor side of the structure is composed of a plurality of semi-precast concrete floor plates 4a and a cast-in-place concrete floor plate 4b above the floor plates. On the upper part of the semi-precast concrete floorboard 4a,
The reinforcing bar 4c is arranged, and the reinforcing bar 4c is connected to the connecting reinforcing bars 2a and 3b.
Then, concrete is cast to construct a cast-in-place concrete floor panel 4b.

When constructing a reverse beam structure using the above structural members, the semi-precast concrete floor plate 4a is arranged before the inter-beam direction beam 2 and the girder direction beam 3, and thereafter the inter-beam direction beam is provided. 2 is placed on the top of the pillar 1 where the concrete casting has been completed to the lower end of the beam, and then the beam 3 in the row direction is installed, and then inserted at the site with the upper main reinforcement 2i of the beam 2 between beams. Anchor bar 2 for anchoring in pillar 1
b, and a reinforcing bar 4c is arranged on the upper part of the semi-precast concrete floor plate 4a. On the semi-precast concrete floor plate 4a, the column / beam joint, the beam end upper cut portion 2g of the interbeam direction beam 2 and the girder line. Cast-in-place concrete is installed at the directional beam / beam joint to construct the structure.

In this manner, the semi-precast concrete floor plate 4a of the peripheral fixed floor plate 4 is erected before the inter-beam direction beam 2 and the girder direction beam 3 so that the connecting rebar projecting from the inter-beam direction beam 2 and the girder direction beam 3 is constructed. 2a and 3b can be constructed without obstruction. Further, the peripheral fixed floor plate 4 is a semi-precast concrete floor plate 4a whose peripheral portion is disposed below the connecting reinforcing bars 2a, 3b, and a reinforcing bar 4c is disposed on the semi-precast concrete floor plate 4a. Casting cast-in-place concrete and constructing the structure can reduce the formwork of cast-in-place concrete.

Next, another embodiment of the cantilever floor plate 5 will be described with reference to FIGS. In the embodiment of FIG. 14, the cantilever floor plate 5 is a semi-precast concrete floor plate integrally formed with the lower part of the girder beam 3, and a reinforcing bar 5 f is arranged on the cantilever floor plate 5 and cast-in-place concrete To construct the structure. By converting the cantilever floor panel 5 into semi-precast concrete, the weight can be reduced, the transport and handling are easy, and it can be used for balconies and corridors.

In the embodiment shown in FIG. 15, the cantilever floor plate 5 is
This is a floor plate made of semi-precast concrete manufactured integrally with the upper part of the girder beam 3. Reinforcing bars 5 f are arranged on the cantilever floor plate 5, and cast-in-place concrete is cast to construct a structure. As in the embodiment shown in FIG.
By converting it into semi-precast concrete, it can be reduced in weight, easy to transport and handle, and can be used for balconies and corridors.

In the embodiment shown in FIG. 16, the cantilever floor plate 5 is
It is a precast concrete floorboard manufactured separately from the girder beam 3 and casts concrete in place at the cantilever floorboard / girder beam joint to construct a structure. Separating the cantilever floor plate 5 and the girder beam 3 makes it possible to reduce the weight, facilitate transportation and handling, and can be used for balconies and corridors.

In the embodiment shown in FIG. 17, the cantilever floor plate 5 is
It is a floor plate made of semi-precast concrete manufactured separately from the girder beam 3 and a reinforcing bar 5f is arranged on the cantilever floor plate 5 and cast-in-place concrete is cast to construct a structure. The cantilever floor plate 5 and the girder beam 3 are separated from each other, and the cantilever floor plate 5 is made of semi-precast concrete, so that the weight can be reduced, transportation and handling are easy, and it can be used for balconies and corridors.

The structures described above with reference to FIGS. 10 to 17 are examples of so-called ramen frames. However, the reverse beam method according to the present invention can be applied to a structure of a multi-story shear wall frame. The embodiment will be described with reference to FIGS. FIG. 18 is a plan view of a structure constructed by the inverted beam method according to another embodiment. FIGS. 19 and 20 are cross-sectional views taken along the line XIX-XIX of FIG.
FIG. 21 is an enlarged sectional view of a part of FIG. In this embodiment, the structure and operation of the other structural members except for the portion where the earthquake-resistant wall is present are the same as those of the above-described ramen frame.
7, the detailed description is omitted.

The multi-story earthquake-resistant wall 8 is a frame beam 2 which is a beam between beams.
2 is a precast concrete structural member connected to the upper and lower surfaces, but since the weight of the precast member is generally limited, the frame beam 22 and the multi-story shear wall 8 are manufactured separately. The frame beam 22 is also made of precast concrete except for the upper part of both ends, and only the connecting reinforcing bar 2a of a predetermined length is protruded from the lower side surface. The upper main bar 2i at both ends embedded in the cast-in-place concrete is provided with a joint 2c in front of the column 21.

On the lower surface of the frame beam 22, there is provided a shear cotter 22 a constituting a horizontal joint with the multi-story earthquake-resistant wall 8, a plurality of sleeve joints 60 and extending upward from the sleeve joint 60 to extend from the upper surface of the frame beam 22. It is made of precast concrete in which a vertical reinforcing bar 61 whose tip 61a protrudes is buried, and a hole 22c for driving concrete into a wall / column vertical joint is formed at both ends.

The frame beam 22 is placed on the end of the semi-precast concrete floor plate 4a of the peripheral fixed floor plate 4 by inserting the sleeve joint 60 into the reinforcing bar 62 of the multi-story shear wall 8 and placed on the semi-precast concrete floor plate 4a. Reinforcing bars 4c are arranged and cast-in-place concrete is cast. After that, the sleeve joint 60 of the multi-story earthquake-resistant wall 8 is inserted into the front end portion 61a of the vertical reinforcing bar 61 projecting from the upper surface of the frame beam 22, and then inside the sleeve joint 60. The grout material is injected and fixed to build a structure.

The frame beam 22 is placed on the semi-precast concrete floor plate 4a of the peripheral fixed floor plate 4, the reinforcing bar 4c is placed on the semi-precast concrete floor plate 4a, and cast-in-place concrete is cast to construct a structure. In addition, it is possible to reduce the formwork of cast-in-place concrete parts such as slab formwork and slab support. Further, the sleeve joint 60 of the frame beam 22 is inserted into the reinforcing steel 62 of the lower precast concrete laminated earthquake-resistant wall 8, and the upper precast concrete laminated seismic retrofit is attached to the tip 61 a of the vertical reinforcing bar 61 projecting from the upper surface of the frame beam 22. This is a structure in which the frame beam 22 and the earthquake-resistant wall 8 are joined by inserting the sleeve joint 63 of the wall 8. By adopting the sleeve joint, the total length of the earthquake-resistant wall 8 including the reinforcing steel is L, and The fault can be reduced and the restrictions on transportation can be reduced.

Also, concrete is poured into the vertical joint 9 from the casting hole 22c to integrate the columns, the earthquake-resistant walls, and the frame beams. Can be provided.

[0059]

As described above, according to the first aspect of the present invention, the beam between the beams and the beam in the girder direction are made of precast concrete, and the concrete between the beams between the beams has already been preceded and the concrete casting has been completed to the lower end of the beam. After placing the beam on the top of the column and then installing the girder beam, connect the main reinforcement at the top of the beam between beams and the anchor bar for anchoring in the column to be inserted at the site, and connect the beam-column joint and beam Cast-in-place concrete is cast at the beam notch upper part of the directional beam, the girder beam-to-beam joint, and the joint of the surrounding fixed floor plate, so that complicated assembly of the floating formwork and difficult concrete casting are not performed. In addition, the beam can be accurately placed and laid, and the beam does not have a horizontal seam of concrete. In addition, the inter-beam direction beam is provided with a notch at the top of the beam end, and the upper end main bar protrudes only up to the column, so that the girder beam can be dropped.
The joint work at the beam joint can be greatly reduced.

According to the second aspect of the present invention, since the cantilever floor plate is made of precast concrete integrally formed with the beam in the beam direction, it is not necessary to assemble the floating formwork or to cast difficult concrete. The accuracy and proof stress of the body can be sufficiently secured.

According to the third aspect of the present invention, in the case of a structure having a floor plate that protrudes long on the outer surface of the column, the cantilever is integrated with the cantilever floor plate, and the protruding length of the cantilever floor plate is long. However, sufficient proof stress can be secured.

According to the fourth aspect of the present invention, the floor plate for fixing the periphery by cast-in-place concrete requires a formwork support on the lower surface, but the precast concrete plate for the formwork is used for the inter-beam direction beam and the girder direction beam. By projecting below the beam, no form member is required.

According to the fifth aspect of the present invention, a shacotter is provided on the upper and lower surfaces of the beam between the beams, a plurality of sheath pipes penetrating vertically are buried, and a driving hole for concrete driving is formed at both ends. Beams, earthquake-resistant walls, and columns can be integrally constructed, and even if the structure is a multi-story earthquake-resistant wall frame, it is possible to provide a reverse beam structure with the same quality as the rigid frame. .

According to the sixth aspect of the present invention, a floor plate made of semi-precast concrete is erected before the inter-beam and the girder beam so that the connecting rebar projecting from the inter-beam and the girder beam becomes an obstacle. It can be installed without. In addition, the semi-precast concrete floor slab is placed under the connecting rebar at the periphery, and the reinforcing steel is placed on the semi-precast concrete floor slab around this fixed floor slab and cast-in-place concrete is cast. The construction of the cast-in-place concrete part can be reduced by constructing

In the invention according to claim 7, the cantilever floor plate is a semi-precast concrete floor plate manufactured integrally with the beam in the beam direction, and a reinforcing steel is arranged on this cantilever floor plate and cast-in-place concrete is cast. In the case of a structure that has a floor panel that protrudes long on the outer surface of the column, it can be reduced in weight by converting the cantilever floor panel into semi-precast concrete, and can be easily transported and handled. Can be used in corridors.

According to the invention of claim 8, the cantilever floor plate is a precast concrete floor plate manufactured separately from the girder beam, and cast-in-place concrete is poured into the cantilever floor plate / girder beam joint. Since the structure is constructed, in the case of a structure having a floor plate that protrudes long on the outer surface of the column, the weight can be reduced by separately providing the cantilever floor plate and the girder beam, and transport and handling are easy, Can be used for balconies and corridors.

According to the ninth aspect of the present invention, the cantilever floor plate is a semi-precast concrete floor plate manufactured separately from the girder beam, and a reinforcing bar is arranged on the cantilever floor plate and cast-in-place concrete is cast. In the case of a structure having a floor plate that protrudes long on the outer surface of the column, the cantilever floor plate and the girder beam are separated from each other, and the cantilever floor plate is converted into semi-precast concrete. It is lightweight, easy to transport and handle, and can be used in balconies and corridors.

According to the tenth aspect of the present invention, in the case of a frame in which an earthquake-resistant wall is joined to the upper and lower surfaces of the beam between beams, the earthquake-resistant wall and the beam between beams are separated from each other and manufactured by precast concrete. A shear cotter is provided on the lower surface of the horizontal joint, the beam between the beams is placed on the end of a semi-precast concrete floor plate, a reinforcing bar is placed on the floor plate, cast-in-place concrete is poured, and a structure is constructed. Therefore, it is possible to reduce the formwork of the cast-in-place concrete part such as slab formwork and slab support. Also, insert the sleeve joint of the inter-beam direction beam into the reinforcing steel of the lower precast concrete multi-story shear wall, and insert the sleeve joint of the precast concrete multi-story anti-seismic wall into the tip of the vertical reinforcing bar projecting from the upper surface of the inter-beam direction. It is a structure that joins the direction-between beams and the earthquake-resistant wall. By using the sleeve joint, it is possible to reduce the fault of the earthquake-resistant wall including the rebar and reduce the restrictions on transportation.

[Brief description of the drawings]

FIG. 1 is a plan view of a structure constructed by a reverse beam method.

FIG. 2 is a sectional view showing a II-II section in FIG. 1;

FIG. 3 is a sectional view showing a section taken along line III-III of FIG. 1;

FIG. 4 is a sectional view showing a section taken along line IV-IV of FIG. 1;

FIG. 5 is a sectional view showing a VV section of FIG. 1;

FIG. 6 is a sectional view showing a section taken along line VI-VI of FIG. 1;

FIG. 7 is a plan view of a structure constructed by a reverse beam method according to another embodiment.

FIG. 8 is a cross-sectional view showing a VIII-VIII cross section of FIG. 7;

FIG. 9 is a cross-sectional view showing a IX-IX cross section of FIG. 7;

FIG. 10 is a plan view of a structure constructed by a reverse beam method according to another embodiment.

FIG. 11 is a cross-sectional view showing a XI-XI cross section of FIG. 10;

FIG. 12 is a cross-sectional view showing a XII-XII cross section of FIG. 10;

FIG. 13 is a sectional view showing a section taken along line XIII-XIII of FIG. 10;

FIG. 14 is a diagram showing another embodiment of the cantilever floor plate.

FIG. 15 is a view showing another embodiment of the cantilever floor plate.

FIG. 16 is a view showing another embodiment of the cantilever floor plate.

FIG. 17 is a view showing another embodiment of a cantilever floor plate.

FIG. 18 is a plan view of a structure constructed by a reverse beam method according to another embodiment.

FIG. 19 is a cross-sectional view showing a XIX-XIX cross section of FIG. 18;

20 is a sectional view showing a section taken along line XX-XX of FIG.

21 is an enlarged sectional view of a part of FIG.

FIG. 22 is a diagram showing a conventional inverted beam construction method.

FIG. 23 is a view showing another conventional inverted beam construction method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 pillar 2 beam between beams 2 a connecting bar 3 girder beam 3 b connecting bar 4 perimeter fixed floor plate 4 a precast concrete floor plate 4 b cast-in-place concrete floor plate 4 c reinforcing bar for lap joint 5 cantilever floor plate 7 precast concrete plate for formwork

Claims (10)

[Claims] In a reverse beam method having a peripheral fixed floor plate and a cantilever floor plate below the inter-beam direction beam and the girder direction beam, the inter-beam direction beam has a connecting reinforcing bar for a peripheral fixed floor plate projecting from a lower side surface of the beam. The projecting portion is made of semi-precast concrete projecting from the lower end of the beam end so as to anchor the lower main bar to the column, and the upper main bar is protruded from the upper cut portion of the beam end to the front of the column, while the girder beam is And a precast concrete floor provided with connecting reinforcing bars for a peripheral fixed floor plate on the lower side surface of the beam, and the peripheral fixed floor plate is a precast concrete floor plate provided with a lap joint reinforcing bar connected to these connecting reinforcing bars. Then, using these members, the inter-beam direction beam is placed on the top of a column that has already been concreted to the lower end of the beam, and then the girder beam is installed. Connects the fixing anchor muscle into the pillars to be inserted in the upper end of the main reinforcement and the site of the Harima direction beams, columns,
Inverted beams characterized by casting cast-in-place concrete at the beam joints, the upper cuts at the beam ends of the beams between beams, the beam-to-beam joints at the girder direction, and the joints at the fixed floor slabs in the periphery Construction method. 2. The reverse beam method according to claim 1, wherein said cantilever floor plate is made of precast concrete integrally formed with said beam. 3. The cantilever beam is manufactured integrally with the cantilever floor plate,
It is made of precast concrete that protrudes from the beam end to the front of the column so as to anchor the main bar to the column, and connects the main bar to the anchor bar for anchoring in the column to be inserted at the site to join the column and beam. 3. The reverse beam construction method according to claim 2, wherein the structure is constructed by placing cast-in-place concrete in the section. 4. The reverse beam method according to claim 1, wherein the inter-beam direction beam and the girder direction beam are formed by projecting a precast concrete plate for a formwork below the beam. . 5. The beam between beams is provided with a shear cotter for connecting a precast concrete multi-story earthquake-resistant wall on its upper and lower surfaces, and a plurality of sheath pipes penetrating vertically are buried therein. Made of precast concrete that has a hole for placing concrete in the section, and after inserting the vertical reinforcing bars of the precast concrete multi-story shear walls into these sheath pipes, grouting material is injected and fixed. The reverse beam method according to any one of claims 1 to 4, characterized in that: 6. A reverse beam construction method having a peripheral fixed floor plate and a cantilever floor plate below a beam between beams and a beam in a girder direction, wherein the beams between beams protrude only on a connecting reinforcing bar for a peripheral fixed floor plate on a lower side surface of the beam. It is made of semi-precast concrete with only the main reinforcement at the lower end of the beam protruding from the lower end of the beam so as to be anchored to the column, and only the main reinforcement at the upper end of the beam end protruding up to the front of the column. The directional beam is made of precast concrete in which only a connecting reinforcing bar for a peripheral fixed floor plate is protruded from a lower side surface of the beam, and the peripheral fixed floor plate is a semi-precast concrete whose peripheral portion is disposed below the connecting reinforcing bar. Using these members, the semi-precast concrete slab is placed prior to the inter-beam and girder beam, then the inter-beam Placed on the top of the column where the concrete casting has already been completed to the lower end of the beam in advance, and after installing the girder direction beam, arranging a reinforcing bar on the semi-precast concrete floor plate, the direction between the beams By connecting the upper main reinforcement of the beam and the anchor reinforcement for fixing in the column to be inserted at the site, on the semi-precast concrete floor plate, the column / beam joint, the beam end upper cutout of the beam between beams and A reverse beam method, in which cast-in-place concrete is cast at the girder beam-beam joint to construct a structure. 7. The cantilever floor plate is a semi-precast concrete floor plate integrally formed with the girder beam,
7. The reverse beam construction method according to claim 6, wherein a reinforcing bar is arranged on the cantilever floor plate and cast-in-place concrete is cast to construct a structure. 8. The cantilever floor plate is a precast concrete floor plate manufactured separately from the girder beam, and cast-in-place concrete is poured into a cantilever floor plate / girder beam joint to form a structure. The reverse beam construction method according to claim 6, wherein the method is constructed. 9. The floor plate made of semi-precast concrete manufactured separately from the beam in the girder direction, wherein the cantilever floor plate is provided,
7. The reverse beam construction method according to claim 6, wherein a reinforcing bar is arranged on the cantilever floor plate and cast-in-place concrete is cast to construct a structure. 10. The inter-beam-direction beam has a connecting reinforcing bar for a peripheral fixed floor plate protruding from a lower side surface of the beam, a joining shear cotter provided on a lower surface thereof, and a plurality of sleeve joints and an upper part extending from the sleeve joint. It is made of precast concrete that extends and embeds a vertical joint bar whose tip part protrudes from the upper surface of the inter-beam direction, and at both ends of which a drilling hole for concrete is inserted into the wall / column vertical joint. So,
The inter-beam direction beam is inserted into the end of the semi-precast concrete floorboard and inserted into the reinforcing steel of the precast concrete multi-story shear wall, and the reinforcing steel is placed on the semi-precast concrete floorboard. Pour concrete in place and then insert the sleeve joint of the precast concrete multi-story shear wall into the tip of the vertical reinforcement projecting from the inter-beam direction, and then inject grout and fix it. The reverse beam method according to any one of claims 6 to 9, wherein: