JP3351886B2 - Thin-walled precast concrete beam and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates are those of the manufacturing method of thin precast concrete beam (hereinafter referred to as PC Beam)及patron in precast reinforced concrete construction method.

[0002]

2. Description of the Related Art FIG. 9 shows a PC beam member a as a conventional structure. After confirming the structural design, beam main bars b and rib bars c are arranged in advance as designed, and the members are manufactured. FIG. 10 shows a conventional PC board as a non-structured body, in which a wire mesh e is buried in a PC member d having a channel-shaped cross section, and concrete is poured into a channel-shaped portion by using it as a formwork without demolding. Leave as is.

[0003]

When the PC beam member is used as a structure, the number of types of members to be manufactured increases in accordance with the arrangement of beams, and the production efficiency decreases. P as a non-structure
Although the C plate can be used as a beam formwork, it is not removed after the concrete is cast, but is left as it is, so the beam section becomes large, which is uneconomical.

In addition, it is necessary to ensure the integrity of the PC board and the post-cast concrete, and furthermore, the types of members are increased due to the piping used for the facility work. Can not. The present invention has been proposed in view of the problems of the prior art,
The aim is to simplify the arrangement of bars in the workplace,
Standardized arrangement of thin precast concrete beams, which save labor, ensure the integration of PC members and post-cast concrete, can be used for piping of equipment sleeves, and omit formwork support, and manufacture them The point is to provide a method .

[0005]

In order to achieve the above-mentioned object, a thin-walled PC beam according to the present invention has a grooved shape in which a reinforcing bar having a standard reinforcing amount determined separately from a reinforcing bar of a final design is incorporated. The outer diameter of the sleeve for the equipment piping is
It circular crypts having a central coaxially the corresponding diameter
Each of these cavities is precast concrete
It is characterized in that a plurality of members are provided at intervals in the longitudinal direction of the member.
Sign.

According to a second aspect of the present invention, a bottom piece and the bottom piece are provided.
From two opposite vertical pieces.
On the opposing surface of the pair of vertical pieces, a pipe for equipment piping is provided.
A circle whose center is coaxial with a diameter corresponding to the outer diameter of the leave
-Shaped depressions are provided separately from the reinforcing bar of the final design
Thin pre-caps with built-in reinforcing bars of the determined standard
This is a method for manufacturing a streched concrete beam,
And the two vertical pieces are each separated from the bottom piece by the bottom piece.
The standard so that it is formed on the outside of the piece
Reinforcing the reinforcing bars, placing concrete, and
Plate for the construction of the vertical piece of
And erect the pair of plate-like pieces, and then erect
Moving the plate-shaped pieces separated from each other and approaching each other
Adjust the beam width with, then adjust the beam width on the surface plate
Cast concrete between the pair of slabs
It is characterized by making a plate-like piece for the construction of the bottom piece.

[0007]

According to the present invention, as described above, a thin PC board having a groove-shaped cross section as a structure is manufactured, and the standard reinforcing bar amount is determined for each cross section of the member separately from the reinforcing bar of the final design. Rebars are arranged in advance, and at the work site, the reinforcing bars that are not enough with the design drawings are dropped into the grooved section by beam construction by post-processing,
Concrete is cast in the same part, and the reinforced concrete beam is constructed by using the PC beam as a formwork. The beam members can be manufactured only for each beam cross-sectional dimension, and the formwork support work is omitted during construction. It is possible.

[0008] The circular recess provided on the opposing surface of the pair of vertical pieces facing each other in the PC beam having the groove-shaped cross section functions as a shark, and the cast concrete and the PC are used.
The beam is integrated. In addition, a lap joint of the joint part of the PC beam in the work place becomes possible, and labor saving of reinforcing bars is achieved.

Further, when a sleeve is to be constructed, the above P
An opening is formed by punching a thin bottom piece in a circular cavity provided on the opposite surface of the vertical piece of the C beam, and a sleeve is provided using the opening, and reinforcement is provided on the outer periphery of the opening. By arranging the reinforcing bars to reinforce the opening, it is possible to cope with the arrangement of the sleeve.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and 2 show a thin PC beam and a horizontal bottom piece 1
And a pair of vertical pieces 2 vertically suspended from both ends of the horizontal bottom piece 1 constitute a groove-shaped member, and the standard reinforcing amount of each member is set separately from the final design of the reinforcing bar for each member cross section. After the determination, a standard amount of beam main reinforcement 3 and a standard amount of beam rib 4 are arranged in advance to manufacture a thin PC beam.

The opposed surfaces of the opposed vertical pieces 2 are provided with circular recesses 5 having a fixed pitch and a fixed size. Then, at the work place, after the insufficient amount of the beam main reinforcement 3a and the insufficient amount of the rib rib 4a for the final design were dropped by post-processing in the groove of the PC beam, concrete was cast, and the post-cast concrete was cast. And the PC beam are integrated. At this time, the recess 5 functions as a shark.

In the figure, 6 is a column, 6a is a column main bar, and 6b is a column bar bar. Since the illustrated embodiment is configured as described above, the fabrication of the members can be solved only for each beam cross-sectional dimension, the PC beam can be used as a part of the structure, dismantling cost, disposal The cost of the formwork including the cost can be reduced, the members can be manufactured in the middle stage of the design, the work can be leveled, and the stock can be made in advance.

FIG. 3 shows the correspondence of the portion penetrating the sleeve as the equipment beam, and shows the recess 5 provided on the vertical piece 2 of the PC beam.
In the portion where the sleeve 7 is arranged, the thin bottom piece is removed, the sleep 7 is inserted between the openings 8 of the vertical piece 2 thus formed, and the openings are formed around the openings 8. Reinforcing bars 9 are arranged. Figure 7 shows the thin PC
The method for manufacturing a beam is shown.
A plate-like piece 12 having a circular concave portion 5 on the upper surface for forming a vertical piece is cast . That is, the pair of vertical pieces 2
Respectively fell from the bottom piece 1 to the outside of the bottom piece 1
Reinforcing the reinforcing bar with the standard bar
For the construction of the pair of vertical pieces
Is made. Next, after the primary production of the plate-shaped piece 12, both ends of the plate-shaped piece 12 are erected, and a plate-shaped piece 13 for forming a bottom piece is secondly cast between the opposed plate-shaped pieces 12, 12. . That is, on the surface plate 10,
Erecting the pieces 12, 12 and then erecting said
The beam is moved by moving the plate-like pieces 12 away from each other.
After adjusting the width B, the beam width B on the surface plate 10 is
Concrete between one pair of slabs 12
To make a plate-like piece 13 for the construction of the bottom piece. In the drawing, H is a beam adjusting portion, and B is a beam width adjusting portion.

At this time, since the cross-section of the beam member is unified, the degree of freedom of the manufacturing method is increased, and (a) a method of manufacturing a single member, and (b) a method of manufacturing by partitioning a long frame. ,
(C) A method of first producing a long product and cutting it to a predetermined size is adopted, and FIG. 8 produces a long member.
The beam lengths L ₁ , L ₂ and L ₃ are adjusted by a method such as partitioning or product cutting.

[0015]

The thin PC beam according to the present invention has a groove-shaped cross section P
Reinforcement of standard reinforcement determined separately from the reinforcement of the final design is built in the C beam member, and since the cross section as the member is unified, the production of the member is easy and the degree of freedom of the production method is In the work place, the insufficient reinforcement is added to the PC beam of the groove-shaped cross section for the final design, and the concrete is cast. Since the beams are formed, the arrangement of the reinforcing bars in the work place is simplified, labor is saved, and the weight of the members is reduced.

Further, the circular recess arranged in the vertical member functions as a shark, so that the PC beam and cast concrete are integrated with the PC beam. Ma
In addition, a thin-walled PC with a groove-shaped cross section with a standard reinforcing bar reinforcement
Since the concrete can be cast with insufficient beam main reinforcement and rib reinforcement in the groove of the beam, the reinforcement in the work place is simplified, labor saving is achieved, and not only the form support is omitted but also In addition, a lap joint of a joint in a work place becomes possible, and labor for arranging the reinforcing bars can be saved.

Further , an opening is provided by punching a bottom piece in a concave portion provided in a vertical piece of the thin PC beam having the groove-shaped cross section, and a sleeve is penetrated between openings of the thus formed vertical pieces. In addition, by arranging reinforcing bars on the outer periphery of the opening, it becomes possible to cope with the arrangement of the sleeve of the equipment, and the sleeve is standardized.
Further, according to the production method of the present invention, the thin pre-
Stranded concrete beams can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of a thin PC beam according to the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a vertical sectional side view showing another embodiment of the thin PC beam.

FIG. 4 is a view taken along the arrow in FIG. 3;

FIG. 5 is a roll view of FIG. 3;

FIG. 6 is a view taken along the arrow line in FIG. 3;

FIG. 7 is an explanatory view showing an example of a method for manufacturing a thin PC beam according to the present invention.

FIG. 8 is an explanatory view showing another example of the method of manufacturing a thin PC beam according to the present invention.

FIG. 9 is a longitudinal sectional view of a PC beam member as a conventional structure.

FIG. 10 is a longitudinal sectional view showing a conventional PC board as a non-structural body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Horizontal bottom piece 2 Vertical piece 3 Standard beam main bar 3a Short beam main bar 4 Standard beam rib 4a Short beam rib 5 Concavity 6 Column 6a Column main bar 6b Column bar 7 Sleeve 8 Opening Part 9 Opening reinforcement 10 Surface plate 11 Side frame 12 Plate piece for vertical piece configuration 13 Plate piece for horizontal piece configuration

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04C 3/20 B28B 23/06

Claims (2)

(57) [Claims] 1. An opposed vertical piece of a pair of vertical pieces in a precast concrete member having a groove-shaped cross section in which a reinforcing bar having a standard reinforcing amount determined separately from a reinforcing bar of a final design is provided . Coaxial with a diameter corresponding to the outer diameter of the sleeve
In each case , a circular recess having a center is provided.
Between the recesses in the longitudinal direction of the precast concrete member
A thin precast concrete beam with a standard amount of reinforcement, characterized by being provided with a plurality of spaces. 2. A bottom piece and rising from both sides of the bottom piece.
A pair of vertical pieces opposed to each other,
On the opposite side of the piece, it corresponds to the outer diameter of the sleeve for equipment piping
Circular cavities centered on the same diameter
Standard bar arrangements established and determined separately from the final design bar arrangements
Thin precast concrete beams with built-in rebar
The method according to claim 1 , wherein on the surface plate, the pair of vertical pieces
So that it is formed in a state of falling from the piece to the outside of the bottom piece
Then, reinforce the standard reinforcing bar and place concrete.
To make a plate-like piece for the construction of the pair of vertical pieces, then erect the pair of plate-like pieces on a platen, and then separate the approached plate-like pieces away from each other Do
Adjust the beam width by moving in the direction, then a more that the beam width is adjusted in the surface plate plate
Casting concrete between the pieces to construct the bottom piece
Manufacture of thin-walled precast concrete beams, characterized by making plate-like pieces
Construction method.