JPH08114030A - Form for joint of precast concrete beam and column capital part - Google Patents

Abstract

PURPOSE: To simply install an object without a form installing metallic material, and prevent the occurrence of a change in lateral pressure when concrete is placed. CONSTITUTION: Pipes 15 are arranged in the vertical direction on a form body 11 to cover a clearance between a beam 2 and a beam 2 adjacent to each other, and through bolts are inserted into these pipes 15. These bolts are strutted between a reaction receiving metallic material 17 arranged around a column head part 1a and an upper precast concrete floorboard 3, and are made to resist to lateral pressure when concrete is placed. The slide edge is arranged on the form body 11, and a fine adjustment of horizontal direction is made possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork for connecting a PC (precast concrete) beam and a column head.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10, in an RPC (precast reinforced concrete) column-beam joint, R
Receiving metal fittings 46 that are vertically arranged along the outer edges of the ends of the adjacent RPC beams 42 that are bridged over the heads of the PC columns 41.
In the meantime, both ends of the projecting corner member 48 made of a slate and having an L-shaped flat cross section are dropped to close the gap between the adjacent beams 42, thereby accurately forming the gap between the adjacent beams 42. It is known to fill a gap (Japanese Patent Laid-Open No. 6-10406).

Further, as shown in FIGS. 8 and 9, a structure for finishing a joint between a pillar 1 of a structure and a PC (precast concrete) beam 2 mounted on a pillar head 1a of the pillar 1. A mouth form, which is provided with side faces of adjacent PC beams 2 and includes a form body 11 for covering a gap between the adjacent PC beams 2 and, and the form body 11
Comprises a first member 52 fixed to one side of a pair of opposing side surfaces of the PC beam and extending to the other side, and a second member 53 fixed to the other side of the side surface and extending to one side, These first member 52 and second member 53 are joint molds of a precast concrete beam and a pillar head which are attached so that their end portions are wrapped to cover the joint structure of the pillar 1 and the PC beam 2. A frame is also known (Japanese Utility Model Laid-Open No. 4-113653).

As described above, the mold body 11 is composed of the first member 52 and the second member 53 fixed to the PC beam 2, and the first member 52 and the second member 53 are mutually end. When the parts are attached to the lap position, the position of the lap portion formed by the first member 52 and the second member 53 moves according to the position of the PC beam 2, and therefore the installation of the PC beam 2 is performed. Both PC beams 2 adjacent to each other by absorbing the error generated in the position
The form body 11 corresponding to the installation position of can be formed.

[0005]

However, in the formwork for connection shown in FIG. 10, a large number of formwork mounting metal pieces 46 as shown in FIG. 11 must be prepared and correctly attached to the beam 2 at predetermined positions. It takes time.

Further, in the mold for a joint shown in FIG. 8 and FIG. 9, the first member 52 and the second member 53 are fixed to the PC beam 2 so that the mold body 11 is formed by wrapping the ends together. Since the configuration is adopted, the left and right first and second members 5
Set the mounting position of 2,53 exactly to the desired position,
That is, it is difficult to finely adjust the form body 11 in the lateral direction (left and right).
In particular, the first member 52 and the second member 53 are likely to cause a lateral pressure change during concrete pouring, and it is desired that there is no such lateral pressure change and fine adjustment is performed.

Therefore, an object of the present invention is to solve the above-mentioned problems and to mount the precast concrete beam and stigma which can be easily mounted without the metal fittings for mounting the form as shown in FIG. The purpose is to provide a formwork for connection with the department.

Another object of the present invention is to provide a formwork for a connection between a precast concrete beam and a pillar head, in which the mounting position of the formwork main body can be easily fine-tuned and set to a desired position.

[0009]

In order to achieve the above object, a formwork for precast concrete beams and pillar heads according to the present invention is mounted on a pillar of a structure and a pillar head of the pillar. In a formwork for a connection, which comprises a formwork main body for covering a gap between adjacent beams to finish a connection with a precast concrete beam, a metal object for receiving a reaction force around the pillar head of the column. , A steel frame body having an L-shaped cross section is installed on the metal object, and a pipe is vertically provided on the outer side of the frame body, and a through bolt is inserted into the pipe. However, a compressive force is applied vertically to the bolt between the metal for receiving the reaction force and the upper precast concrete floor plate to resist the lateral pressure at the time of placing concrete (claim 1).

It is preferable that the formwork body has a slide edge at a lateral end thereof that can be pulled out toward the precast concrete beam.

[0011]

According to the first aspect of the present invention, by rotating the through bolt inserted into the pipe vertically provided on the form body, the through bolt is vertically moved between the reaction receiving metal and the upper precast concrete floor plate. A compressive force is applied to the to resist the lateral pressure when placing concrete. Therefore, it is not necessary to use the conventional metal mold for mounting the mold as shown in FIG. 11 to mount the mold main body, and the mold can be mounted very easily.

According to the second aspect of the present invention, since the slide edge that can be pulled out toward the precast concrete beam is provided at the lateral end of the formwork main body, fine adjustment in the lateral direction can be performed in connection with the precast concrete beam.

[0013]

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

In FIGS. 1 and 2, 1 is a pillar of the structure,
Reference numeral 2 is a PC (precast concrete) beam, and the ends of the precast concrete beam 2 are placed on the pillar head 1a from four sides as shown in FIG. 8 or 10. 3 is an upper precast concrete floorboard.

Reference numeral 10 is a formwork for finishing the joint with the precast concrete beam 2 placed on the column head 1a of the column, and covers a gap between adjacent beams. The mold body 11 is provided. This formwork main body 11 is made of a steel member having an L-shaped flat cross section, and has slide edges 12 that can be pulled out toward the precast concrete beam 2 at both lateral ends thereof, as shown in FIG. . That is, the steel form body 11 can be slid when engaging with the precast concrete beam 2, and fine adjustment in the lateral direction is possible. Numeral 13 is a bolt penetrating through a lateral elongated hole provided in the slide edge 12, and is fixed by being tightened after the mold body 11 is positioned at a predetermined position.

The formwork main body 11 has a flange portion 14 running laterally on the outer circumference at the upper surface and the intermediate height position. In addition, in the formwork main body 11, the steel pipe 1 is formed in a vertically penetrating manner at the outer peripheral corners so as to penetrate the brim portions 14.
5 is provided, and a through bolt 16 is inserted into the pipe 15. On the other hand, a reaction force receiving metal fitting 17 made of a metal fitting such as an angle having an L-shaped cross section is attached to the four sides of the pillar head 1a of the pillar 1.

As shown in FIG. 5, the threaded bolt 16 has a threaded portion 16a consisting of a male screw at the upper end thereof, which is formed on the pipe 1.
5, the bolt head 16b at the lower end of the through bolt 16 passes through the lowermost collar portion 14 and passes through the rotation receiving seat 18 to the reaction force receiving member 17. Supported.

Therefore, by rotating the bolt head 16b and unwinding it from the frame body 11, the through bolt 16 is stretched between the reaction force receiving metal member 17 and the upper precast concrete floor plate 2. At this time, the pipe 15 acts as a buckling stop for the through bolt 16. This through bolt 16
The compressive force applied to the upper and lower sides produces a force that resists lateral pressure when concrete is placed in the mold body 11.

A positioning member 20 is provided around the column by using the reaction force receiving member 17 to determine a correct disposition position in the horizontal plane of the mold body 1. That is, the clamp member 21 having the L-shaped guide member 23 fixed to the top thereof is attached to the reaction force receiving hardware 17 by the tightening screw 22. As shown in FIG. 7, each L-shaped guide member 23 is positionally fixed so as to contact and guide the outer peripheral edge of the lowermost collar portion 14. Reference numeral 24 denotes a handle provided on the mold body 11 so that the mold body 11 can be gripped.

Because of this construction, (1) the position of the mold body 11 is determined by the inner surface of the guide member 23,
(2) While keeping that position, the slide edge 12 is pulled out and applied to the side surface of the precast concrete beam 2, and (3) the bolt head 16b of the through bolt 16 is turned to pull it up and down, The frame body can be attached as desired. Therefore, the following advantages can be obtained. (a) The pillar / beam joint formwork is simple and easy to set. (b) The hardware for mounting the formwork can be reduced. (c) Fine adjustment in the lateral direction is possible in connection with precast concrete beams.

By the way, in FIGS. 1 and 3, a small screw type jack 30 is disposed by being held by a holder 31 on a reaction force receiving member 17 attached to the four circumferences of the column head 1a of the precast concrete column 1. ing.
In this jack 30, right and left wedge-shaped moving pieces 34, 34 are sandwiched between an upper elevating plate 32 and a lower fixing plate 33, which are tapered so as to become thinner toward the outer side in the lateral direction. One feed screw 35 penetrating the center of 34, 34 is engaged with the right screw and the left screw in the opposite relationship, and by turning the feed screw 35 to the right or left, the wedge shape on the left and right is formed. The moving pieces 34, 34 are brought closer to each other to raise the elevating plate 32, and by rotating in the other direction, the moving pieces 34, 34 can be moved away from each other and lowered.

This jack 30 is arranged in advance on the reaction force receiving member 17 when the precast concrete beam 2 is installed. Then, the precast concrete beam 2 is placed on it. Under this condition, the level of the precast concrete beam 2 is adjusted by operating the jack 30.

According to the installation work of the precast beams, the crane can be quickly released from the hand and the leveling accuracy can be easily secured. Therefore, the set of precast concrete beams becomes very easy.

In the above embodiment, the upper end of the through bolt 16 is screw-engaged with the upper part inside the pipe 15 of the frame body 11,
As shown in FIG. 6, the threaded portion 16a of the lower portion of the through bolt 16 is screw-engaged with the lower portion of the pipe, and the upper end is abutted against the precast concrete beam 2. It can be stretched between them and a compressive force can be applied. In this case, the clamp member 21 is used as a connecting member between the mold body 11 and the reaction force receiving metal member 17 as illustrated.

Further, although the screw type jack has been described in the above embodiment, a hydraulic type jack or the like may be used if necessary.

[0026]

As described above, according to the present invention, the following excellent effects can be obtained.

According to the first aspect of the present invention, by rotating the through bolt inserted in the pipe vertically provided on the formwork main body, between the metal for receiving the reaction force and the upper precast concrete floorboard, By applying compressive force up and down on the through bolt, it is possible to resist the lateral pressure when placing concrete. Therefore, it is not necessary to use the conventional metal mold for mounting the mold as shown in FIG. 11 to mount the mold main body, and the mold can be mounted very easily.

Further, according to the invention of claim 2, since the slide edge is provided in the formwork main body, it is possible to perform fine adjustment in the lateral direction in the connection with the precast concrete beam.

[Brief description of drawings]

FIG. 1 is a perspective view showing a connection form frame of a PC beam and a pillar head according to the present invention.

FIG. 2 is an enlarged view of a through bolt portion of FIG.

FIG. 3 is an enlarged view of a jack portion of FIG.

FIG. 4 is a view showing a slide edge of the mold body of FIG.

FIG. 5 is a diagram for explaining the application of compressive force to the through bolt of FIG.

FIG. 6 is a diagram showing another configuration for applying a compressive force to the through bolt of FIG.

7 is a partial cross-sectional view showing a configuration of a guide member portion of FIG.

FIG. 8 is a perspective view showing a conventional mold for connecting a PC beam and a pillar head.

9 is a plan view showing a formwork for the connection between the PC beam and the pillar head of FIG. 8. FIG.

FIG. 10 is a perspective view showing a conventional RPC beam-column joint.

11 is a view showing a part of the receiving metal fitting of FIG.

[Explanation of symbols]

1 Structural Pillar 1a Pillar Head 2 Precast Concrete Beam 3 Upper Precast Concrete Floorboard 10 Formwork 11 Formwork Body 12 Slide Edge 13 Bolt 14 Collar 15 Pipe 16 Through Bolt 16a Screw 16b Bolt Head 17 Reaction Force Receiving metal 18 Rotating receiving seat 20 Positioning member 21 Clamping member 22 Tightening screw 23 L-shaped guide member 24 Handle 30 Jack 31 31 Holder 32 Elevating plate 33 Fixing plate 34 Wedge-like moving piece 35 Feed screw 41 RPC column 42 RPC beam 46 Receiving metal fitting 48 Outer corner member 52 First member 53 Second member

Claims (2)

[Claims] 1. A formwork main body for covering a gap between adjacent beams in order to finish a joint between a column of a structure and a precast concrete beam placed on a column head of the column. In the mold for a connection, a metal for receiving a reaction force is attached around the pillar head of the column, and a steel frame main body having an L-shaped cross section is installed on the metal, Is provided with a pipe in the vertical direction on the outer side of the pipe, and a through bolt is inserted into the pipe, and a vertical compressive force is applied to the bolt between the metal for receiving the reaction force and the upper precast concrete floor plate, thereby A formwork for connecting a precast concrete beam and a column head, which resists lateral pressure during pouring. 2. The connection between a precast concrete beam and a column head according to claim 1, wherein the formwork main body has a slide edge at a lateral end thereof that can be pulled out toward the precast concrete beam. Formwork.