JPH01121427A - Large roof framework of long-sized span - Google Patents

Abstract

PURPOSE: To frame a large roof of long and large span without columns by installing angle brace members between the top ends of column members or girder trusses and beam truss members, and anchoring both ends of tension members to the respective top ends to lift roof load. CONSTITUTION: Column members 1, 1 with a height (h) for fitting angle of brace members 4 are erected with a required space in a beam-to-beam direction, above a beam fitting position H, and girders 2 are laid between the respective column members 1, 1 in a ridge direction. Beam members 3... are laid between the column members 1, 1 and between the girder trusses 2, 2 in the beam-to- beam direction. The angle brace members 4 are installed between the top ends of the column members 1 or girder trusses 2 and the beam truss members 3, and tension members 5 such as prestressing bars are additionally provided in the longitudinal direction of the beam members 3. Both ends of the tension members 5 are anchored leading pre-tension into the top ends of the column members 1 or girder trusses 2 along the angle brace members 4 to lift roof load by the tension members 5 for a long period of time. The applied quantity of steel is therefore economized to construct a lightweight, low-cost columnless large space building.

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a large roof bridge with a long span used as a roof of a factory building, a music hall, or an airplane hangar. Column spacing is 10
This invention relates to a large roof bridge (a long span structure or a column-free space bridge) that can be constructed without pillars over a long span of 0 m to 200 m.

BACKGROUND TECHNOLOGY Conventional roof bridges have a structure in which a large number of pillars stand in a short span of 20 to 30 layers in the direction between the beams.

■Recently, long-span structures (column-free space bridges) that construct long spans without columns have been introduced0 For example, according to an article in the Nikkan Kogyo Shimbun dated August 6, 1988, Shimizu Corporation ) built a factory with a span of 175 m without pillars! The structural details of Shimizu's large roof frame introduced in the same article are unknown, but the span! A truss beam was erected between the 75■ columns, and piano wire (PC
This structure incorporates prestress that compresses the truss beam by strongly pulling it (steel wires, PC steel bars, etc.), and this prevents the lower part of the truss from expanding downward due to the roof load and preventing it from sagging. It is estimated that the roof of the

Problems to be solved by the present invention (I) As mentioned in item ① above, in the case of a roof structure with a large number of columns in a short span, the effective floor area within the building is reduced by the amount occupied by the columns. This caused some inconvenience in the use of the indoor space.

(II) Shimizu's large roof bridge described in (■) above has the advantage that the effective floor area increases by about 10% and there is no restriction on the use of indoor space because there are no pillars in the way. Since truss beams are constantly subjected to compression due to prestress that is large enough to restore sagging, the bottom chord of the truss beam must have a cross-sectional area that can withstand the compression, which poses the problem of increasing the size of the structure. .

Means for Solving the Problems As a means for solving the problems of the prior art described above, a large roof frame with a long span according to the present invention is shown in preferred embodiments in FIGS. 1 to 7 of the drawings. As mentioned above, leave the required spacing in the direction between the beams, and install the small beams at the position iH.
To install the cane members above, construct the pillars 1.1 with a height h, and in the direction of the first row, install the girders 2 between each pillar 1.1, and in the direction between the beams, install the pillars 1.1 between the pillars 1.1. A small beam material 3 was erected between the main beam truss 2 and 2 and between the main beam trusses 2 and 2. Then, a support member 4 is installed between the top of the column l or large beam truss 2 and the small beam truss member 3, and a tension member 5 such as a PC steel bar is attached in the longitudinal direction of the small beam 3. Both ends of the tension member 5 are fixed by introducing one tensile force to the top end of the column 1 or girder truss 2 along the strut member 4, and the long-term roof load is lifted by the tension member 5.

Function: The upright state of each column 1 is stiffened in two axial directions in the plane by the large beam truss 2 and small beams 3 installed thereon. Also,
The girder truss 2 is stiffened by the small beam members 3 inserted therebetween, and lateral forces such as those caused during an earthquake are handled by the girder truss 2, the small beam members 3, and the cane members 4.

In response to the buoyancy force applied to the roof during wind pressure, the cane material 4 acts as a compression material, thereby reducing the distance between the supporting points of the small beam materials 3.

Tensile members 5 such as PC steel rods attached in the longitudinal direction of the small beam members 3
has its both ends pointing upward along the beam members 4 and is fixed under moderate tension to the top of the column l or the girder truss 2, so the small beam members 3 are pulled up by the tension members 5. The long-term roof load applied to the small beam members 3 is supported by the tension members 5 as tension members. In other words, the roof load is directly received by the small beams 3, but at the same time, the tension members 5 attached to the small beams 3 support it as a tensile force, and the load is transmitted to the ground via the girder truss 2 or directly by the column l. and processed.

Example Next, the illustrated embodiment will be explained.

Figures 1 and 2 show the outline of the structure of a large roof frame with a long span according to the present invention. In the figure, 1 is the column material, which is a long column with a length of about 100m to 200m in the direction between the beams. They are built vertically and spaced apart. A square steel pipe or the like is used as the pillar material 1 with its upper end closed. The spacing between the columns 1 in the column direction is approximately 30 m. Column 1 has a height h (this h varies depending on the size of the span between the beams) above the position where the small beam is attached (height H above the floor, H is about 3 to 15 m). , so the height above the ground is (H+h
) It is said to be a tall pillar.

Between the pillars 1.1 arranged in the girder row direction, the beam truss 2 is a flat plate-shaped beam truss with a size approximately equal to the height h.
is erected, and the pillars 1 are supplemented in the column direction (Fig. 2).

Further, in the direction between the beams, small beams 3 are constructed between the columns 1 and 1 and between the large beam trusses 2, 2, so that the columns 1 are supplemented in the direction between the beams. Furthermore, each small beam 3... is supplemented with a connecting beam (cross beam) 6... incorporated in the beam direction,
A flat truss roof is assembled.

Each of the above pillar materials 1... and the top of the large beam truss 2, and the small beam material 3
A cane material 4 is installed between the two.

The intersection position of the cane material 4 and the small beam material 3 is configured such that the length S from the pillar material 1 is approximately L15 of the total length L of the small beam material 3 (that is, the span between the pillar materials 1.1). has been done. The slope of the hojo material 4 is about 10° to 30'.

By the way, the structure of the small beam 3 is an I-beam material formed into an I-shape with a high height by welding and assembling plates, or a similar height as shown in FIGS. 3A and 3H. It is said to be constructed using I-beam steel on the market.

As detailed in Fig. 4, the structure of the relationship between the small beam material 3, the pillar material l, and the hojo material 4 is as shown in Fig. 4. A long frame member 4 is connected with a high-strength bolt joint between the section steel 4a and the H-section steel 4b welded to the column l. In the small beam material 3, stiffeners 10, 10 are inserted at the welding locations of the H-shaped steel 4a for reinforcement. Further, on both sides of the web of the small beam member 3, a bar-shaped steel 11 is welded on an extension line of the square member 4.

Then, PC steel rods 5 (or PC steel wires) are placed as tension members on both sides of the web of the small beam 3 near the lower flange.
(FIG. 3B), and is attached in the longitudinal direction of the small beam 3. As shown in detail in FIG. 4, both ends of the PC steel bar 5 are first passed through the bar 11, roughly guided upward along both sides of the web of the H-beam 4, and then A fixing mechanism is provided at the top end of the pillar material 1 or the large beam truss material 2, and an appropriate tensile force is introduced to fix it, thereby lifting the load (long-term load) applied to the small beam truss material 3... It is said to be composed of In other words, most of the roof load received by the small beam members 3 is borne by the tensile stress of the PC steel rods 5,
This is transmitted to the pillar materials 1 and processed. In addition,
The cane material 4 acts as a tension material or a compression material depending on the magnitude and direction of the load, and handles the load on the small beam material 3.

For example, in response to upheaval caused by wind pressure, that is, the levitation force of the roof, the cane material 4 acts as a compression material or a tension material. At this time, the distance between the supporting points of the small beams 3 becomes smaller, so the amount of steel used for the small beams can be reduced accordingly.

Also, what about the lateral forces that occur during strong winds or earthquakes?

Stress is transmitted and resisted to the small beam members 3 and the beam members 4 in the direction between the beams, and to the girder truss 2 and the connecting beams 6 in the cross-beam direction. At this time as well, the rod member 4 acts as a compressive member or a tensile member.

A roof finishing material 7 is laid on the upper surface of the truss roof made up of the small beams 3 and the connecting beams 6. However, a transparent finishing material 7' such as wire wave is laid on the sloped roof portion along the cane 4 to allow natural lighting into the building. In addition, a projecting portion 8 serving as a window that can be opened and closed is provided in a part of the slanted roof portion to provide natural ventilation.

A triangular attic space 9 formed by the cane material 4 and the small beam material 3 is used as an equipment space, and ducts, wiring, and piping are laid therein.

Different embodiments In addition to the above I-beam materials, the small beam materials shown in Fig. 5A,
As shown in H, it is also possible to use H-shaped steel horizontally as the upper and lower chord members 3a and 3b, and use a truss (assembly beam) incorporating H-shaped steel or angles as the diagonal member 3C between them. In this case as well, the structure is such that PC steel rods 5 as tension members are attached along both ends of the H-shaped steel serving as the lower chord member 3b.

Further, as the hojyo material 4, a pipe material may be used.As described in detail in conjunction with the embodiments, the effect of the present invention is as follows.According to the large roof bridge with a long span according to the present invention, ~
Since it is possible to construct a building with a long span of 200 m without pillars, it has a wide effective floor area and can be used as a building such as a factory, music hall, or airplane hangar, and it is convenient to create a large space with a good view and no obstructions. make it possible to use it economically.

Furthermore, since this large roof bridge has a structure in which the load is constantly suspended and supported by the tension members 5, the cross-sectional area of the small beam members 3 can be particularly reduced, and the amount of steel used can be reduced, making it lightweight and inexpensive. It contributes to the construction of spatial buildings.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an outline of the large roof frame according to the present invention, FIG. 2 is a perspective view of the same, and FIG. 3A. B is a front view and a cross-sectional view showing an example of the structure of small beams, Figure 4 is a front view showing the bridging part of small beams, hojo pieces, and columns in detail, and Figure 5 A and B are small beams. FIG. 3 is a front view and a cross-sectional view showing different examples of materials.

Claims (1)

[Scope of Claims] [1] Column material (1) with required spacing in the direction between the beams and with the installation height of the cane material above the small beam installation position (
1), and a girder truss (2) is erected between each column (1) (1) in the girder direction, and a girder truss (2) is erected between each column (1) (1) in the direction between the beams.
Small beams (3) between each other and between the main beam trusses (2) (2)
... have been erected, and the pillar material (1) or girder truss (
A cane material (4) is installed between the top of 2) and the small beam material (3), and a tension material (5) is attached in the longitudinal direction of the small beam material (3).
Both ends of the tension member (5) are connected to the column member (1) along the cane member (4).
) or a large roof frame with a long span, characterized in that a pre-tension force is introduced and fixed at the top of the girder truss (2), and the long-term roof load is lifted by tension members (5).