JPH0377903B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a construction method for precast reinforced concrete beams having intersection points (hereinafter referred to as PC beams).

(Prior art) and (problems to be solved by the invention) Conventionally, when attempting to construct this type of PC beam,
There were difficulties in temporary construction work such as lifting equipment and shoring.
The current situation is that it has not yet been implemented.

(Means for Solving the Problems) The present invention was proposed to solve these problems, and after constructing the columns and girders, the main beam reinforcements were installed protruding from the side surfaces of the small beam intersections. A PC small beam member is spanned between opposing large beams, and then the main beam reinforcement protruding from the PC small beam member and the main beam reinforcement of another small beam member intersecting the same PC small beam member are connected,
The feature is that post-cast concrete is placed between the PC beam members with the main beam reinforcements connected.
This relates to the PC beam construction method.

(Function) As described above, in the present invention, a PC small beam member having main beam reinforcements protruding from the side surface of the small beam intersection is manufactured in advance, and the PC small beam member is spanned between opposing girders. After joining the main beam reinforcement that protrudes from the side of the small beam intersection and the main beam reinforcement of the small beam member that intersects with the same member, post-cast concrete is placed between the gaps formed between the PC beam members to which the main beam reinforcements have been joined. By pouring, the PC beam member is constructed so as to integrally intersect with the other small beam member.

(Effects of the Invention) According to the present invention, a PC beam member having main beam reinforcements protruding from the side surface of the cross section of the beam is manufactured in advance, and
After constructing the columns and girders, the same members were brought in and placed between the opposing girders, and the protruding parts of the main beam reinforcements were connected to the main beam reinforcements of other small beam members, and then the main beam reinforcements were connected.
Post-cast concrete is placed between the gaps between the PC beam members, which greatly simplifies the shoring work, and the lifting equipment used for pillar and girder erection can be used as is. PC beam members are installed, which greatly simplifies construction.

Furthermore, at the intersection of the PC small beam member and another small beam member, the main beam reinforcement of the same small beam member and the protruding part of the main beam reinforcement of the PC small beam member are joined to form a PC beam in which the main beam reinforcements are joined. Since concrete was placed between the gaps formed between the members, the above-mentioned
The PC beam member and other beam members are integrally joined at the intersection, and a structurally reliable PC beam having an intersection is constructed.

(Example) The present invention will be described below with reference to the illustrated embodiments.

A is a PC beam member, in which a pair of short horizontal members 2 are integrally branched out from one side of a long vertical member 1, and a main beam reinforcement 3 is protruded from the other side at an extended position of the horizontal member 2. has been done. Furthermore, the vertical and horizontal members 1,
At the free ends of 2, there are cutout steps 1a and 2a for girder mounting.
is missing. (See Figure 3) A' is a PC beam member that is to intersect with the PC beam member A, and main beam reinforcements 4 are provided protruding from both end faces thereof. (See Figure 3) After constructing the frame of the structure by constructing PC columns B and PC girders C, (see Figure 4) both ends of each vertical member 1 of a pair of PC beam members A are constructed. The cutout steps 1a are placed on the cutout steps 5 for supporting small beams provided on the opposing girders C, and the cutout steps 2a of each horizontal member 2 are mounted on the cutout steps 5 of the girder C provided between the opposing girders C. It is mounted on the cutout stepped portion 5.

Next, a PC small beam member A' is arranged between adjacent PC small beam members A, A, and the protruding beam main reinforcement 4 of the PC small beam member A' is
and the protruding beam main reinforcement 3 of the PC beam member A are connected with a coupler 6, post-cast concrete 7 is poured (see Figure 2), and the two members A and A' are joined together, Build a grid of PC beams. (See Fig. 1) Each member A, A' has two cases in which the upper and lower main reinforcements 3 and 4 and a stirrup 8 are built in as shown in Fig. 5, and a case in which the lower end main reinforcements 3 and 4 are built in as shown in Fig. 6. In some cases, only part of the stirrup 8 is built-in, and the upper main reinforcement is placed during slab construction on the PC beam.

In the figure, 9 is a stop bar, and 10 is a reinforcing bar.

As described above, the illustrated embodiment is a PC beam member A consisting of a vertical member 1 having a main beam reinforcement 3 protruding from the side surface of the cross section of the beam, and a horizontal member 2 branching out from the member 1.
is manufactured in advance, and the same member A is carried in after constructing the pillars B and girders C, and the cutout steps 1 at each end of the vertical and horizontal members 1 and 2 are made.
a, 2a are mounted on the cutout step 5 of the girder C, the PC beam member A is supported without shoring between the girder C, and the protrusion of the beam main reinforcement 3 in the member A and the PC small beam member A are supported. The beam member A' is joined to the protruding part of the beam main reinforcement 4, and post-cast concrete 7 is poured to construct a lattice-shaped PC beam in which both the members A and A' are integrally connected. According to the illustrated embodiment, the shoring is greatly simplified, and the lifting equipment for erection of the pillars B and girders C can be used as is for the above-mentioned members A,
It is used for the installation of A′, and the construction becomes significantly easier.

Furthermore, both members A and A' are connected to the beam main reinforcements 3 and 4, respectively.
The protruding ends of the members A,
A′ is integrally connected to construct a structurally reliable lattice-shaped PC beam.

FIG. 7 shows another embodiment of the present invention, which is the same as the embodiment described above except that the PC beam member A is composed of a member 1 and one horizontal member 2 branched out from the member 1. It's the same.

In the figure, parts equivalent to those of the above embodiment are given the same reference numerals.

Also, the PC beam member A' has a main beam reinforcement 4 protruding from one end opposite to the PC beam member A, and the other end is directly mounted on the cutout step 5 of the girder C. The opposing beam main reinforcement protrusions of A' are joined and post-cast concrete 7 is placed in the same area.

FIG. 8 shows another embodiment of the present invention, in which a small beam member A'' made of cast-in-place concrete is applied instead of the PC small beam member A' in the embodiment of FIG. Beam main reinforcements 3, 3 and joint main reinforcements 11 protruding from each side of the vertical members 1, 1 of member A
Layer and splice both ends of the cast-in-place concrete 1.
2 to construct a cast-in-place concrete beam member A″ that is integrated with both PC beam members A. (See Figure 9) In the figure, the same parts as in the above example are the same. A code is attached.

The embodiment shown in FIG. 10 shows a case where the central PC beam member A' in the embodiment shown in FIG. 7 is constructed as a small beam member A'' made of cast-in-place concrete.

In the drawings, parts equivalent to those of the above embodiments are given the same reference numerals.

In the embodiment shown in FIG.
In the embodiment shown in Figure 0, joint main reinforcements 14, 14 are connected to the beam main reinforcements 3, 3 protruding from the vertical members 1, 1 in the opposing PC beam members A, A through couplers 13, 13, respectively. At the same time, the main reinforcing bars 14, 14 for both joints are overlapped and cast-in-place concrete 15 is poured to form a small beam member A'' made of cast-in-place concrete.

In the drawings, parts equivalent to those of the above embodiments are given the same reference numerals.

The example shown in Fig. 12 is a small beam member made of cast-in-place concrete between the opposing PC small beam members A and A.
A'', the sleeves 16, 16 connected to the ends of the beam main reinforcements 3 are buried in the sides of the opposing PC beam members A, A, and the sleeves 16, 16 are
The main reinforcing bars 17, 17 for joints are respectively connected to 16, the opposing main reinforcing bars 17, 17 are overlapped, and post-cast concrete 18 is poured to form a small beam member A'' made of cast-in-place concrete. be.

Incidentally, after the main beam reinforcing bars 3 and the main reinforcing bars 17 for joint are joined to the sleeve 16, grout material is injected into the sleeve 16.

In the drawings, parts equivalent to those of the above embodiments are given the same reference numerals.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various ways without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIG. 1 shows PC beams and columns formed by the method of the present invention.
A plan view showing an example of a frame made of girders, 2nd
The figure is a partial cross-sectional plan view, Figure 3 is a perspective view of the PC beam member installed between the girders and the PC beam member connected to the same member, and Figure 4 is the frame before the installation of the beam. 5 and 6 are cross-sectional views of the PC beam members installed between the girders and the PC beam members intersecting and joined to the same members, respectively.
8 and 8 are plan views respectively showing other embodiments of the frame constructed by the method of the present invention, and FIG. 8 shows still another embodiment of the frame constructed by the method of the present invention. 9 is a partial cross-sectional plan view thereof, FIG. 10 is a plan view showing another embodiment of the structure constructed by the method of the present invention, and FIGS. 11 and 12 are its on-site construction. It is a cross-sectional plan view which shows a small beam member part. A...PC small beam member, A'...PC small beam member, A''...cast-in-place concrete small beam member, B...column, C...large beam, 1...vertical member, 2...horizontal member, 3, 4...beam main reinforcement ,
6...Coupler, 7...Post-cast concrete, 11...
Main reinforcement for joint, 12...Cast-in-place concrete, 13
...Coupler, 14...Main reinforcement for joint, 15...Cast-in-place concrete, 16...Sleeve, 17...Main reinforcement for joint, 18...Cast-in-place concrete.

Claims (1)

[Claims] 1 After constructing the columns and girders, the PC beam members with main beam reinforcements protruding from the side surfaces of the small beam intersections are placed between the opposing girders, and then the main beam reinforcements protruding from the PC beam members are A PC characterized in that the main beam reinforcement of another small beam member intersecting the same PC small beam member is joined, and post-cast concrete is poured between the PC small beam members to which the main beam reinforcements are connected. Small beam construction method.