JPWO2008102429A1 - Construction method of large space building - Google Patents

Abstract

Provided is a method for constructing a large space frame 1 capable of reducing stress remaining after erection due to deformation during lift-up. In this large space frame construction method, the truss columns 21 and 21 that are the columns of the portal truss 2 are erected on the front F side at intervals in the horizontal direction, and the rear surface portion 4 is constructed on the rear R side. Assemble the truss beam 22 which is the beam of the portal truss and the roof frame 3 extending from the truss beam to the rear side near the ground, lift the truss beam and the rear end of the roof frame to a predetermined height The truss beam and the truss column are joined in a state where the rear end is lifted to a higher position than the rear end, and the rear end is lowered and joined to the rear surface.

Description

  The present invention relates to a method for constructing a large space building in which pillars and walls cannot be provided at intermediate portions such as airplane hangars, sports covered stadiums, and warehouses.

  Conventionally, as disclosed in Patent Documents 1 and 2, a method of constructing a large space building by bridging a roof frame composed of trusses on columns erected at four corners is known.

Various methods have been proposed and implemented as a method of bridging the roof frame between columns.
For example, a jack-down method in which a temporary support is built up to the height at which the roof frame is installed, a jack is installed on the temporary support, the roof frame is assembled on the extended jack, and then the jack is lowered. There is.
Also, the roof frame is assembled on the ground, a jack is installed at the upper end of the pillar, the lower end of the PC steel wire that passes through the jack is connected to the roof frame, and the roof frame is lifted to a predetermined position by the stroke of the jack. After that, there is a lift-up method that joins the top of the column and the roof frame.
Patent No. 2,945,917 Japanese Patent No. 2979039

However, with the conventional jack-down method, temporary support works become large in proportion to the area of the roof frame and the installation height, so when building a large space building, it takes time to install and remove the temporary support works. Therefore, the construction period becomes longer and the construction cost becomes higher.
On the other hand, if you try to build a frame that requires a large span, such as an airplane hangar, that cannot be equipped with a pillar on the front, the lift-up method will cause the roof frame to bend due to its own weight when the roof frame is lifted. And torsion will occur.
And, if such a roof frame is joined to a column without correcting the deformation at the time of lifting, the stress state will continue after construction, and the roof frame must be reinforced as a long-term working load. The manufacturing cost increases.
Further, when the roof frame is greatly deformed at the time of erection, the relative position with respect to the columns to be joined is shifted, and it takes time to align the positions for joining, and the working efficiency is lowered.

  Therefore, an object of the present invention is to provide a method for constructing a large space building capable of reducing stress remaining after erection due to deformation during lift-up.

  In order to achieve the above object, the method for constructing a large space building according to the present invention is such that a truss column that is a column-shaped truss column is erected on the front side at intervals in the lateral direction, and a rear support portion is disposed on the rear side. The truss beam to be the beam of the portal truss and the roof frame extending from the truss beam to the rear side are integrated near the ground, and the truss beam and the rear end of the roof frame are assembled. The truss beam and the truss column are joined in a state where the truss beam is lifted to a predetermined height and the rear end portion is lifted to a position higher than the truss beam, and the rear end portion is lowered to the rear support portion. Join.

In the construction method of a large space building according to the present invention configured as described above, a truss beam constituting a portal truss is provided in front of the roof frame assembled near the ground, and the roof frame is more than the truss beam. Lift up so that the rear end is higher.
In this way, by lifting the rear end portion high, the inclination of the truss beam is reduced or eliminated, and alignment with the truss column can be easily performed.
In addition, if the truss beam is corrected and joined to the truss column, the rear end of the roof frame is lowered and joined to the rear support, so the stress after installation will be smaller than the stress generated during lifting. Thus, the stress remaining on the roof frame can be reduced.

FIG. 1 (a) is a diagram showing a bending moment when a truss beam and a rear end of a roof frame are at the same height. FIG. Fig. 1 (b) is a bending moment diagram when the rear end of the roof frame is raised higher than the truss beam. Fig. 1 (c) is a state where the truss beam and truss column are joined in the state of Fig. 1 (b) and the rear end is lowered. A bending moment diagram is shown. It is a perspective view explaining the structure of the rear surface part and side part which support a roof frame. It is a top view explaining the structure which extended the roof frame in the back side of the truss beam. FIG. 4A is a front view showing a process of assembling a truss beam between truss columns, and FIG. 4B is a side view of the roof frame in the same process as viewed from the side. Fig.5 (a) is the front view which showed the process of lifting the truss beam between truss pillars, FIG.5 (b) is the side view which looked at the roof frame of the same process from the side. FIG. 6A is a front view showing a process of correcting the inclination of the truss beam, and FIG. 6B is a side view of the roof frame in the same process as viewed from the side. FIG. 7A is a front view showing a process of joining the truss beam and the truss column, and FIG. 7B is a side view of the roof frame in the same process as viewed from the side. FIG. 8A is a front view showing a process of joining the rear end portion of the roof frame to the upper end of the rear surface part, and FIG. 8B is a side view of the roof frame in the same process viewed from the side. It is a top view explaining the structure of the large space frame which joined the truss beam and the roof frame to the truss pillar, the rear surface part, and the side part.

Explanation of symbols

F front R rear S side 1 large space frame (large space building)
2 Portal truss 21 Truss column 22 Truss beam 3 Roof frame 32 Roof beam (rear end)
4 Rear part (rear support part)
5 Side (side support)
7 Hanging points

The best mode for carrying out the present invention will be described below with reference to the drawings.
In the large space building construction method of the present embodiment, the large space frame 1 used as an airplane hangar will be described as a large space building.

First, the overall configuration of the large space frame 1 will be described with reference to FIGS.
The large space frame 1 includes a portal truss 2 constituting the front F side as shown in FIG. 8A, a rear surface portion 4 as a rear support portion as shown in FIG. It is mainly comprised from the side parts 5 and 5 as a side support part connected, and the roof frame 3 as shown in FIG.

  As shown in FIG. 8 (a), the portal truss 2 is a flat truss constructed by combining steel materials such as H-shaped steel and angle steel as axial force members in a triangular shape, and is spaced in the horizontal direction. The truss columns 21 and 21 on both sides are erected and the truss beam 22 spanned between the upper ends thereof.

As shown in FIG. 2, the truss column 21 is manufactured in a tower shape having a rectangular section in plan view that is uniform in the vertical direction by combining steel materials such as H-shaped steel and angle steel in a triangular shape.
In addition, as shown in FIG. 8A, the truss beam 22 spanned between the truss columns 21 and 21 is an arch whose center portion is raised by combining steel materials such as H-shaped steel and angle steel in a triangular shape. It is manufactured in a shape.
Furthermore, both ends of the truss beam 22 are manufactured so that the cross section gradually increases toward the side S so that the portions joined to the truss columns 21 and 21 have a haunch shape.

On the other hand, as shown in FIG. 3, the roof frame 3 extends in a substantially rectangular shape in plan view on the rear R side of the truss beam 22 of the portal truss 2.
The roof frame 3 includes a plurality of roof trusses 31 extending in a direction substantially orthogonal to the longitudinal direction of the truss beam 22, and the roof trusses 31,. Are connected to each other in a plan view obliquely between the roof trusses 31,... 34,...

  As shown in FIG. 8B, the roof truss 31 is manufactured in a so-called platform truss shape by combining steel materials such as H-shaped steel and angle steel, and the front F side is joined to the truss beam 22. The

  Further, as shown in FIG. 2, the rear surface portion 4 that joins the roof beams 32 at the rear end portion of the roof frame 3 has a plurality of rear surface columns 41,. .. and rear members 43,... For connecting the rear columns 41,..., Reinforcing trusses 44 for reinforcing the rear columns 41, 41 at predetermined locations,. It is mainly comprised by the mount frame 42 ... which installs the pillar 41, ....

Further, as shown in FIG. 2, the side surface portion 5 that joins the side edges of the roof frame 3 includes a plurality of side columns 51,. ... mainly composed of cross members 52,... That are connected in the horizontal direction, and reinforcing trusses 53,.
The side portions 5 and 5 are joined to the truss columns 21 and 21 of the portal truss 2 at the front F-side ends.

  As described above, the large space frame 1 is formed at the upper end of the frame formed in a substantially C shape in plan view by the rear surface portion 4, the side surface portions 5, 5 and the truss columns 21, 21 as shown in FIG. 3 is constructed by joining a launch member in which the roof frame 3 and the truss beam 22 are integrated as shown in FIG.

  Next, the construction method of the large space frame 1 of the present embodiment will be described with reference to FIGS.

First, as shown in FIG. 4A, truss columns 21 and 21 that are columns of the portal truss 2 are erected at intervals in the horizontal direction. The space between the truss columns 21 and 21 is, for example, 150 m or more when the large space frame 1 to be constructed is used for an aircraft hangar.
Further, the side surface portions 5 and 5 joined to the truss columns 21 and 21 and the rear surface portion 4 that connects the side surface portions 5 and 5 on the rear R side are constructed (see FIG. 2).

Subsequently, as shown in FIGS. 4 (a) and 4 (b), an assembly frame 6,... Is placed on the area surrounded by the side surface portions 5, 5 and the rear surface portion 4 and the ground between the truss columns 21, 21. Install.
Then, a truss beam 22 is assembled on the assembly frames 6,... As shown in FIG. 4 (a), and the roof frame 3 is extended behind the truss beam 22 as shown in FIG. 4 (b). Set up.
This roof frame 3 is assembled in an arch shape with the center raised in anticipation of the center being bent by lifting.

In this way, after assembling the truss beam 22 and the roof frame 3 on the assembly bases 6... Near the ground, they are lifted to a predetermined height.
This lifting is performed at the positions of the lifting points 7 shown in FIGS. 5 (a) and 5 (b). For example, although not shown in the figure, a jack is installed on a frame extending from the upper end of the truss columns 21 and 21 toward the truss beam 22, and the lower end of the PC steel wire suspended from the jack is suspended at both ends of the truss beam 22. Connected to points 7 and 7 (FIG. 5A).
Similarly, a jack is also installed at the upper end of the rear column 41, and the lower end of the PC steel wire suspended therefrom is connected to the suspension point 7 of the roof beam 32 of the roof frame 3 (FIG. 5B). Further, when the suspension points 7,... Are provided at a place where there is no frame on which the jack is installed, such as in the middle of the truss beam 22, a temporary support column (not shown) is erected and is placed on the upper end of the temporary support column. The installed jack and the hanging points 7 are connected (FIG. 5A).

And the cylinder of a jack is extended | expanded and the truss beam 22 and the roof frame 3 are integrally lifted as shown to Fig.5 (a), (b). Immediately after the start of the lifting, as shown in FIG. 5B, the lifting is performed so that the truss beam 22 and the roof beam 32 are at substantially the same height.
Lifting with a jack is performed by repeatedly extending, refilling and contracting the jack.

  As shown in FIG. 5B, when the front F side and the rear R side of the roof frame 3 are at the same height, the central part of the roof frame 3 is recessed and bent in an arc shape, and the truss beam 22 rotates clockwise. Rotate to RA and tilt, causing a positional shift with the truss column 21.

  Therefore, as shown in FIG. 6B, the roof beam 32 is lifted first so that the position of the end portion on the rear R side of the roof frame 3 is higher than the truss beam 22. When the opposite side of the truss beam 22 is lifted in this way, the truss beam 22 is now rotated RB counterclockwise, and the inclination is corrected.

  7A and 7B with the front F side lowered, as shown in FIGS. 7A and 7B, together with the roof frame 3 until the front F truss beam 22 reaches the height of the upper ends of the truss columns 21 and 21. The truss columns 21 and 21 and the truss beam 22 are joined by bolts or the like. At this time, since the inclination of the truss beam 22 is corrected, relative alignment with the truss columns 21 and 21 in a side view is easy and both can be efficiently joined. This alignment is performed with an accuracy of, for example, millimeters.

  Then, as shown in FIG. 8A, the upper ends of the truss columns 21 and 21 and both ends of the truss beam 22 are joined to close the portal truss 2. Support by the suspension points 7 other than the points 7, 7 is maintained as it is.

  After the portal truss 2 is closed, as shown in FIG. 8 (b), the roof beam 32 on the rear R side of the roof frame 3 is lowered to the upper end position of the rear column 41, and the rear surface portion 4 and the roof beam 32 are moved. Join.

  Further, at this time, the side edge of the roof frame 3 is bent at its center by its own weight, and the part that has been preliminarily raised in an arch shape disappears and becomes a straight line as shown in FIG. The side edges of the roof frame 3 and the upper ends of the side surfaces 5 and 5 that are thus linear can be easily aligned and can be easily joined together.

  And the top view of the large space frame 1 by which the temporary state was cancelled | released by canceling | releasing the support by the suspension point 7 of the truss beam 22 middle part is shown in FIG. As shown in this plan view, the roof frame 3 is disposed along the inner edges of the rear surface portion 4 and the side surface portions 5 and 5.

  Next, the operation of the construction method of the large space frame 1 of the present embodiment will be described with reference to FIG.

First, as shown in FIG. 1A, when the truss beam 22 and the roof beam 32 are at the same position when lifted, the roof frame 3 is bent to generate a bending moment M1, and the truss beam. 22 rotates RA so that an upper end inclines to the roof frame 3 side.
The rotated truss beam 22 deviates from the position of the truss column 21 indicated by the alternate long and short dash line in a side view, and the two cannot be joined in the same positional relationship.

  Therefore, as shown in FIG. 1B, the inclination of the truss beam 22 is corrected by lifting the roof beam 32 on the rear R side of the roof frame 3 to a position higher than the truss beam 22, thereby correcting the truss column. The posture is controlled so that it can be joined to 21.

In this way, the roof beam 32 at the rear end is lifted high so that the bending moment M2 is generated. However, the inclination of the truss beam 22 decreases or disappears, and it can be easily viewed from the side with the truss column 21. Can be aligned.
Further, if the truss beam 22 is not tilted in the vertical direction, alignment in a plan view can be easily performed.

  Then, the truss beam 22 and the truss columns 21 and 21 are joined in a state where the roof beam 32 is lifted to a high position, and the structure of the portal truss 2 is closed. Then, as shown in FIG.1 (c), the roof beam 32 is lowered | hung to the upper end position of the rear surface part 4, and both are joined.

  Thus, after the portal truss 2 is closed and the front F side of the roof frame 3 is supported by the structure called the portal truss 2, the roof beam 32 at the rear end is lowered to form the roof frame 3. The remaining bending moment M is smaller than the bending moment M1 during lifting shown in FIG.

  That is, as shown in FIG. 1A, the front F side and the rear R side of the roof frame 3 are lifted up while being bent in an arc shape at the same height, and the truss columns 21 and 21 and the rear surface portion 4 are lifted up. When this is joined, a bending moment M1 as indicated by a two-dot chain line in FIG. 1C remains as it is lifted.

  On the other hand, the inclination of the truss beam 22 is corrected by lifting the roof beam 32 so that the roof beam 32 at the rear end of the roof frame 3 is higher than the truss beam 22 (FIG. 1B). When the rear end of the roof frame 3 is lowered after the truss columns 21 and 21 are joined, the maximum value of the bending moment M of the roof frame 3 is reduced as shown in FIG.

  If the bending moment M generated in this way is reduced, the residual stress can also be reduced, so there is no need to design for the stress that greatly increases during lifting, and the roof frame 3 and the large space frame 1 are economical. Can be built.

  Further, the truss beam 22 constituting the portal truss 2 is provided in front of the roof frame 3 assembled near the ground, and the rigidity is increased, so that it resists deformation due to its own weight when lifting. Can do.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are possible. Are included in the present invention.

For example, in the above-described embodiment, the case where the rear support portion and the side support portion are trussed has been described. However, the present invention is not limited to this, and the rear support portion and the side support portion may be a steel plate, reinforced concrete, or the like. It can be built in the shape of a wall, or it can be a portal truss like the front.
Moreover, in the said embodiment, although the side part was constructed | assembled as a side support part, it is not limited to this, When it sees from the side S without providing a side support part, it becomes a portal form. It may be a large space building.

Claims (4)

The truss pillars that will be the pillars of the portal truss on the front side are erected at intervals in the horizontal direction, and the rear support part is constructed on the rear side.
Assembling a truss beam to be a beam of the portal truss and a roof frame extending from the truss beam to the rear side near the ground,
Lift the truss beam and the rear end of the roof frame to a predetermined height,
Joining the truss beam and the truss column in a state of being lifted up to a position where the rear end is higher than the truss beam,
A construction method for a large space building, wherein the rear end portion is lowered and joined to the rear support portion. When constructing the rear support portion, side support portions that support both side edges of the roof frame are also constructed,
The method for constructing a large space building according to claim 1, wherein after the truss beam and the truss column are joined, the roof frame is joined to the rear support part and the side support part.   The construction method of a large space building according to claim 1 or 2, wherein the rear end portion is lifted higher than the truss beam until the truss beam and the truss column are in a state of matching in a side view.   The truss beam is provided with hanging points near both ends and the middle part, and the truss beam and the truss column are joined in a state where the hanging point of the intermediate part is lifted higher than the hanging points at both ends. The construction method of the large space building according to any one of claims 1 to 3.

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