JP2928948B2 - Construction method of large span roof - Google Patents

Description

The present invention relates to a method for constructing a large span roof suitable as a roof for a large-scale exhibition hall, a multipurpose hall, a stadium, and the like.

[Background Art] In recent years, various constructions of large span roofs capable of securing a vast space have been implemented. As a conventional construction method, large-span roofs are divided in advance into units of size and weight that take into account the lifting capacity of crane cranes and work space, and assembled large on the ground. Temporary columns or main columns are erected at the erection position, and each large roof unit is lifted by a lifting crane and erected between predetermined temporary columns or capitals of the main column, and all roof units are assembled. . Then, after joining the entire roof unit, the temporary support columns are removed, and then a finishing roof material is attached to the outer surface of the roof.

However, according to the above-mentioned conventional construction method, it is necessary to set up temporary supports in the installation area for all the roof units to be lifted, and the number of temporary supports to be set up is large. As a result, the amount of steel frames used becomes enormous, so that temporary facilities and temporary construction costs are large. Therefore, those points have been a hindrance in reducing the construction cost.

In addition, the roof finishing material is separately constructed when the entire assembly of the roof unit is completed, and cannot be performed simultaneously before that, so that it was not possible to effectively shorten the construction period.

In addition, if the large span roof receives horizontal force such as wind or earthquake while the large span roof is being lifted, the large span roof may vibrate, causing the large span roof to collide with the column or hinder the lifting work. In addition, after the lifting of the large span roof, if the large span roof is suspended for a long time, the seismic force according to the roof weight of the large span roof is added to the pillars in the event of an earthquake. There was a problem that the seismic force for use became large.

The present invention has been made in view of the above circumstances, and it is possible to safely and efficiently lift a large-span roof assembled on the ground, to save labor for temporary work, and to reduce the construction cost of a large-span roof. It is an object of the present invention to provide a method for constructing a large span roof that can reduce the time and the construction period.

"Means for solving the problem" The method for constructing a large span roof according to the present invention is to lay the large span roof in the erection range, and then lift the grounded large span roof along the temporary columns, A method for constructing a large-span roof in which a large-span roof is lowered between main pillars and erected between the main-span pillars. In this case, the upper and lower ends of the backup hanging member are connected to upper and lower receiving beams of the step rod.

Further, the method for constructing a large span roof according to the present invention is characterized in that, before lowering the large span roof to the outer peripheral columns, the suspended large span roof is assumed to be attached to the capital of the corresponding outer peripheral column. I have.

In addition, the method for constructing a large span roof according to the present invention is characterized in that the striking between the strut and a part of the large span roof facing the strut when the large span roof collides with the strut while the large span roof is being lifted. It is characterized in that a guide machine groove for absorbing a force is provided, and a large span roof is lifted along the guide mechanism.

Further, the method for constructing a large span roof according to the present invention is provided between each support and a part of the large span roof facing the same until the outer pillar is permanently installed after the large span roof is lifted. The feature is that the horizontal movement of the large span roof is restricted by the thrust support.

[Operation] Lifting of the large span roof is performed by locking a step rod having a support beam on the upper and lower sides to the large span roof and jacking it up. By connecting the upper and lower ends of the large-roof roof, the step rod may break due to metal fatigue, wind force or seismic force in the suspended state from the lifting of the large span roof to the construction of the outer pillar. Also, a back-up system can be provided with hanging materials to take measures against a large-span roof falling accident.

Also, before lowering the large-span roof to the outer pillars, the suspended large-span roof is assumed to be attached to the capital of the corresponding outer pillars, so that the outer pillars can be freely released due to gusts etc. The large-span roof can be jacked down without any significant deformation of the end side and collapsing, and accurate joining with the column cap of the outer peripheral column becomes possible. Thereby, the fit of the large span roof with respect to the column caps of the outer peripheral columns is improved.

In addition, between each strut and a part of the large span roof facing it, a guide mechanism that can absorb the striking force when the large span roof collides with the strut during lifting of the large span roof,
By lifting the large span roof along this guide mechanism, it is possible to prevent a torsion or deformation due to a balance between the support and the large span roof and a large horizontal force on the support when the large span roof is lifted.

In addition, after the large span roof is lifted, the thrust support provided between each strut and a part of the large span roof facing it is used for horizontal extension of the large span roof until the outer pillars are installed. By constraining the behavior, it is possible to take measures to prevent a large span roof from swaying in the event of an earthquake during the long-term construction of the outer pillar.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

The method for constructing a large span roof according to the present invention is to form a temporary pillar 2 and a permanent pillar 3 in an installation area of a roof (large span roof) 1 and to support the temporary pillar 2 and the permanent pillar 3 on the temporary pillar 2 and the permanent pillar 3. The large span roof 1 is laid on the ground, and then the large span roof 1 is lifted along the temporary support columns 6, and the outer peripheral columns 4 are permanently installed.
Lowering each other, erection between them, and then temporary support 6
The basic method is to remove the roof and construct the roof 1.

Hereinafter, the construction procedure of the roof 1 will be described with reference to FIG. 1 to FIG.

[Temporary Pillars, Permanent Pillars, and Other Construction Methods] First, as shown in FIG. 1, desired temporary pillars 2 and permanent pillars 3, which are lower structures, are constructed in the construction area of the roof 1. Similarly, when the roof 1 is laid, the steel support columns 5 for supporting the roof 1 together with the temporary columns 2 and the main columns 3 and the temporary columns 6 for lifting up the roof 1 are constructed. As shown in FIG. 5, the temporary supports 6 are erected at six locations within the erection range, and each temporary support 6 also serves as a platform for a tower crane 7 for unloading.

[Structure and Finish of Roof Steel Frame Truss] Next, as shown in FIG. 2, a temporary column 2, a steel frame support column 5, and a permanent column 3 of a roof steel truss 8 constituting a frame of the roof 1 at a predetermined height. Perform terrain on. At this time, the weight of the roof steel truss 8 is all supported by the temporary columns 2, the steel support columns 5, and the permanent columns 3.

At this time, the roof steel truss 8 is provided with a roof finishing material such as an outer plate or stainless steel waterproofing, and the top light 9 and other components are simultaneously installed. On the other hand, jacks 10 for lifting up the roof 1 are installed on the upper surfaces of the hypothetical posts 6, respectively.

[Roof Lift-Up] The roof steel truss 8 of the roof 1 has a step rod for lifting the roof 1 as shown in FIG. 6 and FIG.
Attach 11 This step rod 11 has beams 12 and 13 sandwiching the roof steel truss 8 at the top and bottom.
Step rod 12 is lifted by jack 10
11 is held and the lower support 13 is the lower chord of the roof steel truss 8
8a is received from below.

[Safety measures at the time of roof truss] When lifting up the roof steel truss 8, since the lower part of the roof steel truss 8 is likely to be in contact with and damaged when it separates from the main pillar 3, etc. In order to ensure safe work during the construction of 24, the roof steel truss 8
Take the following safety measures for.

In other words, when the roof steel truss 8 is laid,
As shown in FIGS. 8 and 9, as a fixing portion of the roof steel truss 8 to the temporary gantry (the temporary column 2 and the steel support column 5), the truss bundle member 15 is used under the lower chord member 8a via the truss bundle member 15. The base 16 or the plate 17 is attached. Also, as shown in FIG. 10, the former ground-forming base 16 is provided at the three corners of the outer periphery of the roof steel truss 8 with the latter plate 17.
Are mounted on the outer peripheral portion between the ground bases 16. Therefore, after the framing of the roof steel truss 8, the framing base 16 and the plate 17 are attached as they are,
Lift-up is started in this state. Accordingly, it is possible to prevent the lower portion of the roof steel truss 8 from being damaged by the main pillar 3 or the temporary gantry when the roof steel truss 8 is cut off.

[Removal of Steel Support Column and Measurement of Roof] After the roof steel truss 8 is cut off from the temporary gantry, the steel support column 5 is removed. In addition, before the lift-up of the roofed steel truss 8 in the ground-cut state is performed so that the lift-up can be carried out smoothly and safely, each displacement is measured, and the roof steel truss 8 is put into the preparation state for the lift-up based on the measurement data. set.

[Lifting of Roof] Then, from this state, the jacks 10 provided on the six temporary columns 6 are simultaneously operated, the step rod 11 is pulled up, and the lifting of the roof steel truss 8 is started. Control of each jack 10 is performed from a command room on the ground.

[Safety Measures for Roof Lift-Up Work] In the lift-up work of the roof steel truss 8, twist of the roof steel truss 8 due to runout of the roof steel truss 8 at the time of lift-up and contact of the roof steel truss 8 with the support pillar are prevented. In order to do so, take the following safety measures.

That is, as shown in FIG. 11, the temporary support 6 and a part of the roof steel truss 8 facing the temporary support 6 are provided with a horizontal guide mechanism 18 for the roof steel truss 8, and the roof steel truss 8 is moved along the guide mechanism 18. Then, the roof truss 8 is prevented from swinging in the horizontal direction.

In this embodiment, the guide mechanism 18 is an H-shaped steel 19 disposed on one surface of the temporary support 6 as shown in FIG. 12 to FIG.
Both ends of the lower chord material 8a crossing and adjacent to the roof steel truss 8
And an elastic member 20 such as a rubber mat that absorbs a collision force is attached to the side of the H-shaped steel 19 facing the temporary support 6 by an angle member 20a. As shown in FIG. 11, four such guide mechanisms 18 are installed so as to surround one temporary support column 6, and a total of 24 guide mechanisms 18 are installed.

Since the guide mechanism 18 is provided so as to surround the periphery of each temporary support column 6..., The roof steel truss 8 is restrained from swinging in the horizontal direction when the roof steel truss 8 is lifted, and is not restrained in the lifting direction. It has a structure. Therefore, when the roof steel truss 8 collides with the temporary support 6 when the large span roof 1 is lifted, it is possible to restrict the vibration caused by the striking force and wind pressure to a predetermined value or less, and the roof steel truss 8 is lifted. Can be performed safely, reliably and smoothly. Further, since the respective temporary supports 6 are surrounded by the elastic members 20 of the guide mechanism 18, it is possible to prevent the roof steel truss 18 and the temporary supports 6 from being damaged.

[Temporary Fixing of Roof] When the roof steel truss 8 is lifted up to a predetermined height as shown in FIG. 3 while being guided by the guide mechanism 18 in this way, the roof steel truss 8 is attached to the temporary support 6. Temporarily fix.

[Measures to Prevent Sway at the End of Roof Lifting] After the roof steel truss 8 has been lifted, the roof steel truss 8 has been suspended for a long time (about 1.5 months) when the outer peripheral columns 24 are constructed. Take anti-sway measures in the event of an earthquake.

That is, as shown in FIGS. 15 and 16, the guide mechanism 18 attached to the roof steel truss 8 before the lift-up is performed.
Using the thrust support 21 on the pillar portion of the temporary support 6
Attach. This thrust support 21 has a guide mechanism
The guide piece 19 from which the elastic member 20 has been removed is used as it is, and the mounting piece 22 having a U-shaped cross section is fixed to the side of the guide piece 19 facing the temporary support column 6 with a bolt 22a.
The mounting piece 22 has a structure in which a holding portion 23 which is restrained by a pillar portion of the temporary support 6 is provided.

In this embodiment, four such thrust supports 21 are provided so as to surround the periphery of the temporary support column 6, and a total of 24
Place. By providing such a thrust support 21, even if a horizontal force is generated in the temporary support 6 during an earthquake and the roof steel truss 8 is likely to run out, the movement of the thrust support 21 in the horizontal direction is restricted by the temporary support 6. Therefore, the deflection of the roof steel truss 8 can be effectively prevented. Therefore, it is possible to prevent the temporary support column from being deformed or damaged due to a collision.

[Countermeasures against breakage of the step rod after completion of lifting of the roof] It is performed in a short time during the lift-up work, but after the lift-up is completed, it takes a relatively long time (about 1.5 months) until the outer pillar 24 is built. Meanwhile, since the roof 1 is in a suspended state, if the roof steel truss 8 is shaken by a gust or an earthquake, the step rod 11 may be subjected to a stress exceeding the limit and breakage may occur. For this reason, a fall prevention measure is taken to prevent the roof 1 from falling even if the step rod 11 is broken.

That is, as shown in FIG. 6 and FIG. 7, both ends of the two suspension members 25 for backup are fixed to the upper support beam 12 and the lower support beam 13 provided above and below one step rod 11, respectively. Keep it. The suspending member 25 includes an upper suspending member 25a having both ends fixed to the upper support beam 12 and a bundle member 26 thereunder, and a bundle member 2
6 and a lower suspension member 25b having both ends fixed to the lower receiving beam 13. According to the hanging member 25 having such a configuration, in the event that one step rod 11 is broken, the two hanging members 25 immediately support the weight of the roof steel truss 8 in that portion. .

[How to Build Outer Pillars] On the other hand, as shown in FIG. As shown in FIG. 18, when the outer pillar 24 completes the construction of the first section 24a and the second section 24b, the outer pillar 24 is re-skewed and adjusted for the third section 24a.
Perform final tightening before the construction of c. In addition, as shown in FIG. 17, at the three corners of the outer peripheral post 24, a retaining net 27 is formed after the second joint portion 24b is fully tightened in order to prevent falling. The stay net 27 is made of a steel wire that can withstand a predetermined pulling force, and both ends are fixed between the upper end of the second joint portion 24b and the temporary gantry.

[Countermeasures against gusts when constructing outer peripheral columns] In such outer peripheral columns 24, as shown in FIG. 18, gusts can be dealt with in a self-supporting state up to the third node portion 24c by final fastening. However, at the time when the building is completed up to the fourth section 24d at the top, there is a risk of collapse due to a gust and a possibility of being damaged in the self-standing state. Therefore, the following measures are taken.

That is, as shown in FIGS. 19 to 22, the lower end of the roof steel truss 8 is fixed to the capital after the fourth section 24d is constructed. At three corners at the lower end of the roof steel truss 8 as shown in FIG. 10, a T-shaped cross section base 16 attached to a truss bundle 15 shown in FIGS.
The grounding base 16 and the mounting piece 28 having an inverted T-shaped cross section mounted on the column capital are connected to each other by using the above. In addition, the remaining portion of the lower end of the roof steel truss 8 as shown in FIG. 10 is applied to the truss bundle 15 shown in FIG. 21 and FIG.
Using a plate 17 attached to the lower end of the
17 and the plate 29 attached to the capital are connected to each other. Thus, the outer pillar 24 can be prevented from collapsing or the like in the event of a gust, and the roof steel truss 8 and the outer pillar 24 can be properly fitted before the roof steel truss 8 is jacked down.

[Start of Roof Jack Down] Next, the jack down of the roof steel truss 8 with the lower end assumed on the column cap of the outer peripheral column 24 is started. In this case, the lower chord material, the upper chord material and the lattice material of the roof steel truss 8 are taken into consideration so that the roof steel truss 8 can be smoothly jacked down in consideration of the construction accuracy of the outer peripheral columns 24 and the manufacturing accuracy of the roof steel truss 8. And the like are suspended from the final fastening.

[Fixing / joining of roof steel truss 8] When jacking down of the roof steel truss 8 is completed, the lower end of the roof steel truss 8 is fixed to the capital of the outer peripheral column 24, and the roof is attached to the capital of the outer column 24. Steel truss 8
Join the lower ends of At the same time, the lower chord material, the upper chord material, and the lattice material in the roof steel truss 8 are fully tightened.

[Release of Lift-Up Tension] Then, the lift-up tension is released by removing the lift-up step rod 11 attached to the roof steel truss 8, and the roof steel truss 8 is erected on the outer peripheral column 24 in a self-supporting state.

[Removal of temporary column] The jack 10 on the temporary column 6 is dismantled, and the temporary column 6 is subsequently removed.

 With the above operation, the installation work of the roof 1 is completed.

According to the present embodiment, it is possible to perform each operation safely and reliably from the ground construction of the roof 1 to the erection, and to perform these operations smoothly and efficiently.

Also, by laying the truss 8 in the erection area before lifting the roof steel truss 8 of the roof 1, it is not necessary to erect temporary supports for the entire erection area for each truss material. It is possible to reduce the number of man-hours for temporary construction and reduce the cost for temporary construction. In addition, by constructing the roof truss 8 in advance on the roof truss 8 before lifting, the construction of the roof 1 can be assembled on the ground, work safety can be ensured, and the construction period can be shortened. . Further, by using the temporary support column 6 also as a stand of a tower crane, labor saving in temporary construction can be achieved.

"Effects of the Invention" The present invention lays a large span roof in its construction area,
Then, the large span roof is lifted along the temporary pillars, and the large span roof is lowered to the outer peripheral pillars of the main building. Is carried out by engaging a step rod having a support beam on the upper and lower sides with a large span roof and jacking it up, and connecting the upper and lower ends of the backup suspending material to the upper and lower support beams of the step rod. Therefore, in the state of suspension for a relatively long time from the lifting of the large span roof to the construction of the outer pillar, the step rod may break due to metal fatigue, wind force or seismic force. In addition, a back-up system can be provided by using hanging materials, and measures can be taken to prevent a large-span roof from falling.

Further, according to the present invention, before lowering the large-span roof to the outer pillars, the large-span roof in a suspended state is assumed to be attached to the column caps of the corresponding outer pillars. Sometimes, the free end side of the outer pillar is largely deformed and not collapsed due to gusts or the like, and the large-span roof can be lowered to enable accurate joining to the column cap of the outer pillar. This makes it possible to improve the fit of the large span roof with respect to the column caps of the outer peripheral columns.

According to the present invention, between each pillar and a part of the large span roof facing the same, during the lifting of the large span roof,
A guide mechanism to absorb the impact force when the large span roof collides with the support is provided, and the large span roof is lifted along this guide mechanism. It is possible to prevent torsion, deformation, and damage due to gusts due to collision of the vehicle, and to perform lift-up operation safely, reliably, and smoothly.

Further, according to the present invention, after the large span roof is lifted, a large span is provided by the thrust support provided between each support and a part of the large span roof facing the same until the outer peripheral columns are permanently installed. Since the horizontal behavior of the roof is restrained, it is possible to take measures to prevent large-span roofs from swaying in the event of an earthquake during the construction of outer pillars for a relatively long period of time. Safe construction of span roof is possible.

[Brief description of the drawings]

1 to 4 are views showing a construction procedure of a roof according to the present invention. FIG. 1 is a view showing how to construct a temporary column and a permanent column, and FIG. A diagram showing the assembly work,
FIG. 3 is a view showing a lift-up operation of the roof, FIG. 4 is a view after the completion of the lift-up of the roof, FIG. 5 is a plan view showing installation positions of the temporary columns and jacks in the installation area, FIG. 6 and FIG. FIG. 7 is a side view and a front view showing a step rod,
8 and 9 are side views showing the main part of the lower surface of the end of the roof steel truss, FIG. 10 is a plan view of the roof steel truss, and FIG.
The figure is a plan view of the roof steel truss showing the arrangement of the guide mechanism,
12 to 13 show a guide mechanism, FIG. 12 is a plan view showing an installed state of the guide mechanism, FIG. 13 is a longitudinal sectional view of the guide mechanism, and FIG. View from arrow A, 15th
Figures and 16 show the thrust support.
The figure is a plan view of the main part showing the installed state of the thrust support.
Fig. 16 is a longitudinal sectional view of the thrust support, Fig. 17 is a side view of the outer peripheral pillar on the roof, Fig. 18 is a side view of the outer peripheral pillar, Figs. 19 and 20 are a side view and a front view, and FIGS. 21 and 22 are a side view and a front view showing another example of the structure. 1 ... Roof (Large span roof), 6 ... Temporary column (column), 24 ... Peripheral column, 11 ... Step rod, 12, 13 ...
… Receiving beam (upper receiving beam, lower receiving beam), 18 …… Guide mechanism, 21
... thrust support, 25 ... hanging material.

Claims (4)

(57) [Claims] (1) A large span roof is laid in its construction area,
Then, the large span roof is lifted along the temporary pillars, and the large span roof is lifted down between the main outer pillars and installed between them. Is performed by locking a step rod having upper and lower receiving beams to a large span roof and jacking up the step rod, and upper and lower ends of a backup hanging material are connected to the upper and lower receiving beams of the step rod. Construction method for large span roofs. 2. A large span roof is laid in its erection area,
Then, the large span roof was lifted along the temporary pillars, and the large span roof was lowered to the outer peripheral pillars of the main building. A method of constructing a large span roof, wherein a large span roof in a suspended state is assumed to be attached to a column cap of a corresponding peripheral pillar before lowering the pillars. 3. A large span roof is laid in its construction area,
Next, in the construction method of the large span roof, the large span roof was lifted along the temporary pillars, and the large span roofs were lowered to the outer peripheral pillars of the main building and installed between them. A guide mechanism that absorbs the impact force when the large span roof collides with the support during the lifting of the large span roof is provided between a part of the large span roof facing
A method of constructing a large span roof, wherein the large span roof is lifted along the guide mechanism. 4. A large span roof is laid in its construction area,
Then, the large span roof is lifted along the temporary pillars, and the large span roof is lifted down between the permanent pillars and the large span roof is installed between them. After that, until the outer pillars are permanently installed, restrain the horizontal movement of the large span roof by the thrust support provided between each pillar and a part of the large span roof facing it. Construction method of large span roof characterized by the following.