JPS6347855B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing a building using precast concrete members.

In general, in buildings with large floor areas such as warehouses, large markets, and other markets, floors with small beams are desired in order to make more effective use of the internal space. A construction method called flat slab, which uses a wooden floor, has been proposed and is currently in use.

However, in this conventional construction method, the slabs must be made of cast concrete on site, making it impossible to use precasting.Furthermore, shoring is required to form the slabs, resulting in a long construction period and the need for on-site work. This required a large amount of labor and was unavoidably expensive.

On the other hand, when constructing buildings, various parts are precast, and in general, there are some that use panels attached to a steel structure, and some that use prestressed concrete beams and concrete slabs, but steel structures Compressive and bending stresses are small, and it is expensive to make it perfect.Precast concrete structures have traditionally only been made of large beams with large beams; There was nothing.

As mentioned above, in consideration of the conventional situation, the present invention is a precast concrete material that can construct a structure similar to a flat slab with a small beam back by combining precast concrete members, has high strength, requires less labor on site, and can be constructed at a low cost. The purpose of this project is to provide a method for constructing buildings using concrete members, and its gist is to erect a large number of precast concrete columns at equal intervals on a concrete foundation, and to attach projections for girder supports to the columns in advance. A large number of precast concrete girders are erected in a lattice arrangement with the ends supported by the protrusions, and each girder has at least one side thereof with a slab support jaw oriented in the longitudinal direction. In the square floor slab erecting part which is integrally protruded and surrounded by the girder, the floor slab supporting jaws are arranged to face each other on two opposite sides, and each of the adjacent floor slab erected parts The precast concrete slabs are erected with the erection directions changed by 90 degrees between sections, and each girder receives the load of the slab of only one section of the joist. It consists in a method of constructing buildings using precast concrete members.

Next, an example of implementation of the present invention will be described with reference to the drawings. First, foundation concrete 1 is poured at the construction site using a conventional method. In this foundation concrete 1, the lower ends of the steel rods 2, 2 for connecting columns and the prestressing steel bars 3, 3 for applying prestress are buried and fitted, and they are made to protrude from the upper end surface. .

Next, a pedestal block 4 is installed on this foundation concrete 1. The pedestal block 4 has steel rod through holes 5, 5 through which the PC steel rod 3 is passed through the square part and the steel rod 2 for column connection is passed through the inside of the center part of the four sides.
... are opened in advance, and each steel rod 2, 3 is passed through each hole 5.

When installing this pedestal block 4, the pedestal block 4 is hoisted horizontally, each steel rod 2, 3 is inserted into the hole 5 and lowered, a liner is placed over the foundation concrete 1, and high-strength mortar 6 is laid in layers. ,
Adjust the level and install the top surface horizontally.

A precast concrete column 7 is erected on the pedestal block 4 thus installed. This pillar 7 is made to be integrally molded in advance with a length of about two floors of a building, and a recessed part 8 is formed in the center of each of the four sides around the lower end, and the recessed part A connecting steel rod insertion hole 9 is formed from 8 to the lower end surface.

On the other hand, a PC steel rod insertion hole 10 is formed vertically through the square portion of the pillar 7, and an enlarged diameter portion 10a formed by a coupler sheath is formed at the lower end of the hole 10.

Each insertion hole 9, 10 formed in the pillar 7 in this way
The above-mentioned steel rods 2 and 3 are inserted into the column to erect the pillar 7 on the pedestal block 4. Prior to this, a strong epoxy resin adhesive is applied to the top surface of the pedestal block 4, and then A coupler joint 11 is screwed onto the upper end of the PC steel bar 3, and the column 7 is lifted up and erected in this manner.

In addition, a PC steel rod 13 is inserted into the PC steel rod insertion hole 10 of the column 7 from the upper end in advance, and a nut 1 is inserted into the upper end.
4 are screwed together and suspended in the hole 10, and then the pillar 7 is lifted up and suspended above the pedestal block 4. Then, the column 7 is fixed by screwing and tightening the nut 15 to the connecting steel rod 2 in the concave portion 8, and the PC steel rod 13 is rotated from the upper end of the column 7 and its lower end is connected to the coupler joint. Screw into the insert 11 to integrate both PC steel bars 3 and 13.

Thereafter, the PC steel rod 13 is pulled from its upper end by jacking, and the end portion is fixed on the upper surface of the column 7 to apply prestress. As a result, the column 7, the pedestal block 4, and the foundation concrete 1 form a mechanically integrated cantilever structure.

The concrete pillar 7 erected in this way has
A girder receiving protrusion 16 is integrally molded in advance at a desired height position around the girder, and the end of the girder 17 is supported on the protrusion 16 to be constructed between the pillars 7, 7.

These girders 17 are installed between each pillar 7 and arranged in a grid pattern, and a large number of floor slab installation parts 18, 18 are surrounded on all sides by these girders 17.
form.

The girder 17 has a downward U-shaped cross section except for both ends, and a solid connecting part 19 is formed at both ends, and connecting PC steel bar insertion holes 20a and 20b are formed above and below the central part. has been done. Further, this girder 17 is integrally formed with a floor slab supporting jaw 21 oriented in the longitudinal direction at the lower edge of one side thereof.

When constructing the girder 17, each floor slab construction section 1
8, the jaws 21 are disposed inside two sides facing each other, and the other two sides support the floor slab in another adjacent floor slab installation part 18 with the jaws 21 facing outside. Deploy.

The connection with the pillar 7 is made by penetrating the pillar 7 and the above-mentioned connecting part 19 as shown in FIGS. 6 and 7.
The PC steel rods 22a and 22b are inserted and fixed under tension at the ends.

In this way, the floor slabs 23,
23... will be constructed. This precast concrete floor slab 23 has a rectangular plane and integrally molded protrusions 23a, 23a at the bottom of both edges, and is formed into a channel shape with a flat plate-like cross section, and as shown in FIG. Parallel beams 1 facing each other
Mortar 21a laid on the jaws 21, 21 of 7, 17
support through. Therefore, the floor slabs 23 are installed in the adjacent floor slab installation parts 18, 18... in directions that are different from each other by 90 degrees, and the entire floor is like a checkerboard pattern, with the floor slabs oriented in the same direction. The constructed floor slab construction parts 18, 18, . . . are arranged in a staggered manner.

This floor slab 23 has metal anchor plates 24, 2 for fixing on the upper surface of the side edge and the upper surface of both end edges.
4... are exposed and fixed on the surface, and the back surface of the anchor plate 24 is welded to reinforcing reinforcing bars 25 in the floor slab 23.

In addition, a metal anchor plate 26 is similarly fixed to each girder 17 at a position corresponding to the plate 24 of the floor slab 23, and a single connecting plate 27 is superimposed on the surfaces of both plates 24 and 26. A connecting plate 27 is welded to both anchor plates 24 and 26 to integrate the floor slabs 23 and the girder 17.

After erecting girders and floor slabs for the length of column 7 in this way, similar columns are connected on top of column 7 in the same manner, and girders and floor slabs are successively erected to create a multi-story building. Build.

The building construction method of the present invention is constructed as described above, and the columns, girders, and floor slabs are all made of precast concrete, and after the columns are erected, the girders and floor slabs are erected in sequence, so that the building construction method can be carried out on-site. Concrete pouring at the site requires nothing other than foundation concrete, and therefore no formwork or other supporting or scaffolding is required, significantly shortening the construction period on site.

In addition, as for the structure to support the floor slabs, the direction of the floor slabs is different in the adjacent floor slab erected parts, and one girder supports only the load of one floor slab erected part. As a result, the back of the girder can be made smaller, and it is therefore possible to create an indoor space similar to that of a building using the flat slab construction method, making it possible to make effective use of ceiling space.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a vertical sectional view of the pedestal block in its installed state, FIG. 2 is a plan view thereof, and FIG. 3 is a partially omitted sectional view of the pillar in its erected state.
Figure 4 is a plan view of the same, Figure 5 is a partial plan view of the girder in the installed state, Figure 6 is a partially omitted enlarged sectional view showing the connected state of the girder, Figure 7 is a bottom view of the same, and Figure 8 is the floor slab. FIG. 9 is an enlarged sectional view of the same portion, FIG. 10 is a partial plan view showing the horizontal connection state of the floor slab, and FIG. 11 is a sectional view taken along the line in FIG. 10. 1...Foundation concrete, 4...Pedestal block, 6...High strength mortar, 7...Column, 11...
Coupler joint, 16... Beam receiving projection, 1
7... Girder, 18... Floor slab installation part, 21... Floor slab support jaw, 23... Floor slab.

Claims (1)

[Claims] 1. A large number of precast concrete columns are erected at equal intervals on a concrete foundation, projections for girder support are integrally formed on the pillars in advance, and the ends of the pillars are supported by the projections to support a large number of precast concrete girders. are erected in a lattice-like arrangement, each of the girders having at least one side thereof a floor slab support jaw integrally protruding in the longitudinal direction, and in a square floor slab erection part surrounded by the girders, The precast concrete floor slabs are erected by arranging the floor slab supporting jaws to face each other on two opposing sides, and changing the direction of construction by 90 degrees between adjacent floor slab erecting parts. A method of constructing a building using precast concrete members, characterized in that each girder receives the load of only one floor slab erected part.