JP2003321806A - Timbering beam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a timbering beam by which a setting between supporting points is facilitated, a cross member after an installation is not required and safety is ensured even in a working scaffold for the form timbering. <P>SOLUTION: The timbering beam 1 has side-face beam frames 2 and 2 arranged in parallel, horizontal tie beam members 3 connecting both side-face beam frames and floor boards 5 fixed at the centers of the webs 4a of top chords 4 for the side-face beam frames 2. The timbering beams 2 are constituted in a sectional box type, and singly display sufficient strength to horizontal force. Since the floor boards 5 constitute the working scaffold and the abutted webs 4a function as toe boards, the webs 4a function as nonslips. A safety net 13 is built by hangers installed to the top chords 4 and a void between the side-face beam frames 2 is protected. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support beam which is bridged between fulcrums and on which a formwork support for constructing a concrete floor slab of a bridge is placed.

[0002]

2. Description of the Related Art A supporting beam used when constructing a concrete floor slab such as a viaduct is constructed by assembling a series of side beam frames by appropriately connecting an intermediate truss and an end truss according to a required span. The beam frames are arranged in parallel at a fixed pitch between fulcrums such as stanchions, and horizontal tie members such as horizontal tie members, horizontal brace members, and diagonal tie members are integrated between them.

In the conventional supporting beam, after the unit side beam frames are assembled on the ground, they are individually lifted by a crane or the like and set between fulcrums, and then a horizontal connecting member is attached.
In addition to the complicated assembling work, there was also a problem in terms of safety because the work at high places was performed in an unstable state. Therefore, in consideration of the safety of supporting beam assembly, a construction method of assembling two side beam frames and a horizontal tie member in a box-shaped cross section on the ground was also implemented.

[0004]

However, even if the supporting beam is assembled on the ground in a box-shaped cross section, the upper surface of each unit side beam frame is used as the work scaffold for the formwork supporting work to be built on the upper surface of the supporting beam. The walking area was very small and dangerous. In addition, a scaffolding board may be bridged between the horizontal tie members, but since a space is inevitably present between the scaffolding board and the side beam frame, it is not sufficient to ensure the safety of the working scaffold.

Further, in the conventional supporting beam, even if a scaffolding plate is laid, since most of the voids occupy a plane, it is necessary to lay a safety net for preventing flying and falling over the entire area. Moreover, since the net will be installed below the supporting beam,
The installation work tends to be dangerous work at a high place.

The present invention has been made to solve the problems of the conventional supporting beams as described above, and it is easy to set the fulcrums, and it is not necessary to take a horizontal connecting material after the installation, and the formwork is used. The work scaffolding for supporting work is also intended to provide supporting beams with safety ensured. In addition, safety can be secured even if the mounting range of the safety net for flying drop prevention is narrow,
Moreover, it is an object of the present invention to provide a supporting beam that can be mounted safely.

[0007]

In order to solve the above-mentioned problems, a supporting beam of the present invention comprises two side beam frames having a truss structure arranged in parallel with each other, and a horizontal connecting member between both side beam frames for connecting the two side beam frames. In the supporting beam having the above-mentioned, the horizontal connecting member has a floor plate fixed to the web of the upper chord member or the lower chord member of the side beam frame. The side beam frame is integrally formed with the end truss and the intermediate truss that provide the support,
A horizontal tie member is fixed to these, and a floor plate made of a plate member is fixed to a web such as an upper chord member. The floor plate constitutes a working scaffold, and the abutting web serves as a toe plate, which prevents slipping.

The upper chord member of the supporting beam according to claim 2 is characterized in that a net hanging metal fitting is attached to the lower flange. The net suspension fitting is, for example, a plurality of eye bolts attached to holes formed in the flange at appropriate intervals, and the ring of the net locking device is hooked to these to suspend the net. The net protects the space between the side beam frames.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Figure 1 is a front view of the supporting beam,
FIG. 2 is a plan view of the same. The support beam 1 includes side beam frames 2 and 2 arranged in parallel, a horizontal connecting member 3 connecting the side beam frames 2 and 2, and a floor plate 5 fixed to the center of the web 4a of the upper chord member 4 of the side beam frame 2.
Have. The side beam frame 2 has an upper chord member 4 and a lower chord member 6 as basic constituent members, and a diagonal member 7 and a vertical member 8 are arranged between these members to form a truss structure.

The horizontal connecting member 3 is a member for connecting the points of the side beam frame 2 to each other, and a supporting portion 9 is provided at the end of the side beam frame 2. The support portion 9 can extend the length of the upper chord member 4 by connecting an auxiliary member (not shown). In addition, a hanging point 10 is provided in advance at an appropriate position of the horizontal tie member 3 protruding above the floor plate 5 so that the supporting beam 1 can be stably hung.

The support beam 2 has a box-shaped cross section,
Since it alone exerts sufficient strength against horizontal force, it is not necessary to reinforce it in the sky by simply lifting the supporting beam 2 that has been brought into the field with a crane and setting it on a support, and the erection man-hour is reduced. Since it can be reduced, the entire construction period can be shortened.

Next, the erected state of the safety net on the supporting beam will be described with reference to FIGS. 3 to 5. FIG. 3 is a sectional view of a supporting beam at the time of installation, FIG. 4 is an enlarged sectional view of a safety net mounting portion of the upper chord member, and FIG. 5 is an enlarged side view of the same. Holes 4c are formed in the lower flange 4b of the upper chord member 4 at appropriate intervals, and the bolts 1 are
1 and the eye nut 12 is screwed to the lower end. The net 13 is suspended by a C-link 14.

A plurality of supporting beams 2 used for constructing a concrete floor slab of a bridge are arranged in parallel between fulcrums provided on a bridge pier or the like, and a large drawing material made of H-shaped steel or the like is laid on the upper surface thereof. After forming staging, formwork support is assembled to this. Support beams 2 until staging is completed
Since the work scaffold is on the top, the nets 13 are attached at the same time as the support beams 2 are installed.

Since the support beam 2 has a structure in which the upper surface is closed as a safe work scaffold and is closed, if the space between the side beam frames 2 is protected by a net 13, flying fall objects can be almost completely prevented. Further, the net 13 can be easily attached from above the floor plate 5.

[0015]

As described above, according to the supporting beam of the present invention, since the floor board is fixed to the web of the upper chord member or the lower chord member of the side beam frame, the working scaffold which is completely closed can be formed. Further, in the upper chord member of the supporting beam according to the second aspect, the net hanging metal fitting is attached to the lower flange, so that the flying fall prevention net can be attached safely and easily.

[Brief description of drawings]

FIG. 1 is a front view of a support beam.

FIG. 2 is a plan view of a support beam.

FIG. 3 is a sectional view of a supporting beam at the time of installation.

FIG. 4 is an enlarged sectional view of a safety net attachment portion of the upper chord member.

FIG. 5 is an enlarged side view of a safety net attachment portion of the upper chord member.

[Explanation of symbols]

1 Support beam 2 Side beam frame 3 horizontal ties 4 upper chord material 5 floor slabs 6 lower chord material

Continued front page    (72) Inventor Mitsuru Otake             6-3-1, Takinogawa, Kita-ku, Tokyo Ken Kawada             Inside the corporation F-term (reference) 2D059 AA06 AA14 BB37 CC05 DD12                       GG29

Claims (2)

[Claims] 1. A side beam frame 2 of truss structure arranged in parallel.
In a supporting beam having a sheet and a horizontal connecting member between both side beam frames for connecting the two, the horizontal connecting member has a floor plate fixed to a web of an upper chord member or a lower chord member of a side beam frame. Support beams. 2. The support beam according to claim 1, wherein the upper chord member has a net hanging metal fitting attached to a lower flange thereof.