JPH0882100A - Lift-up method for constructing catwalk - Google Patents

Abstract

PURPOSE: To improve the period, cost and safety, etc. of a conventional lift-up method for constructing catwalks. CONSTITUTION: A temporary frame 6 adapted to a roof truss configuration is erected beneath a roof truss in the required area and is fitted with a temporary catwalk support 61 on its upper surface, and a series of catwalks 3 to be anchored to the roof truss in said region is assembled on the temporary catwalk support 61. The required facilities are assembled to the catwalks 3, and portions of the catwalks 3 where localized loads may arise are fitted with load balancers at the temporary catwalk support 61 to balance the catwalks as required. The series of catwalks 3 and the facilities are placed on the temporary catwalk support 61 and hoisted, and after the catwalks 3 are anchored to the roof truss, each load balancer is balanced to the center and the temporary catwalk support 61 is lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catwalk lift-up method suitable for attaching a catwalk to a large roof truss in a large space structure such as a multipurpose hall.

[0002]

2. Description of the Related Art In a large space structure such as a multi-purpose hall, a truss roof is usually used, and the roof truss is hung with equipment such as lighting equipment called speakers, various speakers, baton devices, etc. In addition, a catwalk, which is a working passage, is provided for maintenance and inspection of these equipments (see Japanese Patent Laid-Open No. 4-319175). This catwalk is generally regarded as one of the hangings and has a height of 20.
In a large space structure of m or more, each part is unitized and 1
A lift-up construction method is employed in which each unit is grounded, and the required equipment is attached and lifted and fixed. That is, for each unit, a chain block, a chill hole, or the like is hung on a roof truss or beam to be attached, and the unit is normally lifted and fixed.

[0003]

However, the above-mentioned conventional lift-up method still has various problems as described below. Since a high lift of 20 m or more is manually operated, it takes a considerable amount of time to finish all the units, and it is extremely difficult to lift all of them in one day. Due to the manual operation, the tension at each suspension point is biased due to an unbalanced load due to the attached equipment, and even if the suspension points are lifted at the same time, it is difficult to maintain a uniform level and it is always local. Adjustment is required. It is difficult to attach many equipments and lift. In the case of a truss roof having a curved surface that changes three-dimensionally, in order to attach the catwalk in a straight line in a planar shape, it must be specially designed and manufactured in conformity with the variety of truss roof forms. You cannot use the existing one. Generally, the construction period and cost increase. The present invention is intended to solve these problems, and safely, in a short period of time, accurately, at low cost,
It is intended to be installed.

[0004]

In order to achieve the above-mentioned object, the invention of claim 1 is to mount the catwalk in a required area to be fixed to the roof truss on a temporary mount frame in a series as needed and to attach it to the catwalk. The required equipment is also grounded, and the whole of these is placed on a temporary stand and lifted,
After fixing the catwalk to the roof truss, the temporary stand is lowered.

According to a second aspect of the present invention, a temporary mount adapted to the roof truss form is assembled under the roof truss in the required area, and a temporary catwalk receiver is provided on the upper surface of the temporary mount, and the temporary catwalk receiver is installed. On top of that, a series of catwalks that are fixed to the roof truss in the relevant area are grounded, the necessary equipment is installed on the catwalks, and the load balancer is installed at the temporary catwalk receiver at the place where an unbalanced load is generated. And adjust the required balance, and then load the above-mentioned series of catwalks or equipment on the temporary catwalk receiver and lift them up, and fix the catwalks on the roof truss, and then each load balancer. It is characterized in that the temporary catwalk receiver is lowered by balancing it to the center.

According to a third aspect of the present invention, a temporary frame is assembled under the roof truss in the required area, the temporary frame being adapted to the roof truss form, and the temporary frame is divided into several parts. , And assemble the catwalk to be fixed to each roof truss applicable part on the temporary catwalk receiver of each section,
Assemble the required equipment and equipment to the catwalks of each section, and equip the location where an unbalanced load is generated with the load balancer at the temporary catwalk receiver to perform the required balance adjustment, and then to the cats of the above sections. The walk or equipment is placed on the temporary catwalk receiver of each section, lifted in sequence, joined together during the lifting, and finally joined in series until the roof truss as a whole. Hoist it and fix it on the roof truss, then
It is characterized by balancing each load balancer to the center and lowering all the temporary catwalk receivers.

The invention according to claim 4 is the invention according to claim 1, claim 2 or claim 3, in which receiving beams are crossed and joined to the lower surface of each part of the catwalk, and both ends of these receiving beams are connected. Each of them is hung on a roof truss with hanging materials, and the catwalk is fixed to the roof truss.

According to a fifth aspect of the present invention, in the fourth aspect of the invention, a suspension bar for attaching the suspension material to the roof truss and a suspension bar for suspending both ends of the receiving beam by suspending from both ends of the suspension bar. And a suspension pipe that hangs from the middle portion of the suspension bar and suspends both ends of the receiving beam, the suspension bar and the suspension rod are preliminarily attached to the roof truss side, and the receiving beam and the suspension pipe are provided. It is made by putting the catwalk side first.

[0009]

According to the invention of claim 1, the temporary mount has a series of ground structures for the catwalk in the required area to be fixed to the roof truss, and the equipment to be mounted on the catwalk. It facilitates erection of the ground and also facilitates lifting and fixing of the whole.

According to the second aspect of the present invention, the temporary pedestal assembled under the roof truss in the required area in conformity with the roof truss form is a series of groundwork for the catwalk in the required area fixed to the roof truss. And, the temporary catwalk receiver that is installed on the upper surface of the temporary mount makes it easy to assemble the equipment to be attached to the catwalk and to easily lift and fix the series of assembled catwalks and the equipment. The load balancer equipped on the temporary catwalk receiver enables proper balance adjustment at locations where an eccentric load is generated on the catwalk when lifting, preventing twisting or deviation due to eccentric load, and Maintain posture.

According to the third aspect of the present invention, the temporary mount which is assembled under the roof truss in the required area in conformity with the roof truss form and is divided into several pieces is high and low such as a roof truss having a large degree of bending. Even if it corresponds to a roof truss that changes a lot, it is possible to make it short and facilitate the construction of the catwalk and the equipment of the equipment on the divided temporary frame. Improve the safety of. In addition, the temporary catwalk receiver of each section on the upper surface of the divided temporary pedestal facilitates the lifting and fixing of the catwalk and equipment of each section that is grounded, and the load balancer equipped on the temporary catwalk receiver is It enables proper balance adjustment at places where an eccentric load is generated on the catwalk during lifting, prevents twisting or deviation due to eccentric load, and maintains a correct posture.
When lifting, the catwalks or equipment of each section are lifted in sequence, joined together during the lifting, and finally connected in series to form the roof as a whole. Lifting even the truss and fixing it to the roof truss enables simple lifting and fixing in a short time even if the roof truss has many changes in height, such as a roof truss having a large degree of bending.

According to the fourth aspect of the present invention, the receiving beam joined to the lower surface of each part of the catwalk by intersecting the lower surface of the catwalk is a three-dimensional structure in which the roof truss to be attached is three-dimensional in comparison with the catwalk which is linearly attached in a planar shape. Even if it has a curved surface that changes to a flat shape or the lower chord member is curved, it is possible to easily mount it without any trouble by changing the crossing angle and intersection of the beam to match the lower chord member. To

According to the invention of claim 5, in the hanging material, a hanging bar and a hanging bar which are preliminarily provided on the roof truss side,
What is the beam and suspension pipe that is attached to the side of the catwalk?
Allows the anchoring of the catwalk to the roof truss to be as simple as a combination of hanging materials.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of a catwalk lift-up method according to the inventions of claims 1 to 5. This embodiment is applied to a large space structure 1 such as a gymnasium having a three-dimensionally curved curved roof shown in FIGS. 1 and 2 which has a height of 20 m or more. The roof of 1 constitutes the truss roof 2. Since the truss roof 2 in this case is a curved roof that changes three-dimensionally, as shown in FIG. 3, each of the intersecting roof trusses 21 is centered on a straight line on the center line.
A curve with a gradually increasing degree of curvature toward the outer side, that is, an arc with a gradually decreasing radius of curvature is drawn.
In this embodiment, as shown in FIG. 3, a catwalk 3 having a plane shape and a straight line is attached to the truss roof 2, specifically, two front and rear a in the frontage direction.
And one line b at the middle portion in the depth direction and two lines c at both ends in the depth direction. These catwalks 3 are, as shown in FIG. 4, the lower chord members of the roof trusses 21 in place, respectively.
It is hung on the 211 with the hanging material 4. Specifically, the lower surface of each part of the catwalk 3 is received by the receiving beams 41 of the steel square pipes, and these receiving beams are integrated with the lower surface of the catwalk 3 by welding. The suspension pipes 42 are erected vertically from both ends and are connected to the intermediate portions of the suspension bars 43, respectively, and the suspension rods 44 are respectively interposed between the ends of the suspension bars and the ends of the receiving beams 41. , And attach each suspension bar 43 to the lower chord of the roof truss 21 as appropriate.
Fix it to 211. However, as shown in FIG. 3, while the catwalk 3 is linear in the plan view, most of the lower chord members 211 of the roof truss 21 form an arc, so that as shown in FIG. In a plane shape, each suspending member 4 is tilted according to the roof truss 21 and diagonally intersects with the catwalk 3. In addition, the suspension bars 43 and the suspension bars 44 of the suspension member 4 are provided on the roof truss 21 side and also on the beam beams.
41 and the suspension pipe 42 are attached to the side of the catwalk 3 in advance, and they are docked after lifting up. The catwalk 3 is provided with required lighting fixtures, various speakers, equipment fixtures 5 such as a baton device at various places.

Here, among the catwalks 3, the construction procedure for the two a in the frontal direction with a relatively large radius of curvature and a small degree of curvature will be described with reference to (1) (2) (3) of FIG. Will be described in order.

(1) As shown in a partially enlarged view of FIG.
Assembling the temporary mount 6 adapted to the form of the roof truss under the predetermined roof truss 21 in the frontage direction, the temporary mount is
A temporary catwalk receiver 61 is detachably arranged on the upper surface, and the roof truss is placed on the temporary catwalk receiver.
A series of catwalks 3-a fixed to 21 are grounded, and required lighting equipment, various speakers, equipments 5 such as baton devices are mounted at various places on the catwalk, and at locations where an unbalanced load is generated. The temporary catwalk receiver 61 is equipped with a load balancer 62 for balance adjustment, and then the above-mentioned series of catwalk 3-
a to the equipment 5 are placed on the temporary catwalk receiver 61 and lifted up (see FIG. 10).

As shown in FIGS. 10 to 12, the temporary pedestal 6 has a temporary catwalk receiver 61 made of a pipe truss removably disposed on the ground support 63. The framing support 63 consists of the required number of large underjacks 63 on the framework 631.
The steel pipes 633 are arranged through 2 and the steel scaffolding plates 634 are laid on these steel pipes, and the handrail 635 and the skirting board 636 are assembled to form the temporary catwalk receiver 61. Two vertical pipe trusses 61 on a pipe truss 611
It is formed by assembling two and receives the catwalk 3-a on the vertical pipe truss through the required number of large receiving jacks 613. Then, in order to adapt the form of the catwalk 3-a to the form of the lower chord member 211 of the roof truss 21, those large undertaking jacks 632 and 613 are adjusted up and down. At the time of lift-up, the temporary catwalk receiver 61 is slung at various places, and the electric chill holes 7 hung from various places of the roof truss 21 hoist the catwalk 3-a to the equipment 5 together. A sling wire 72 is used for the slinging (see FIG. 10), and the slinging wire 72 corresponds to the electric chill holes 7 hung from various parts of the roof truss 21 and the horizontal pipe truss 611 of the temporary catwalk receiver 61. And hook each on the C hook 71 of each electric chill hole (see FIG. 10). The load balancer 62 includes a guide rail 621 and a weight 622 which is guided by the guide rail to change its position.
It may be attached to the lower surface of the horizontal pipe truss 611 of the temporary catwalk receiver 61 at a location where an eccentric load is generated (FIG. 10), but the attachment may be made appropriately after slightly lifting the situation to see the situation. On the ascending temporary catwalk receiver 61, the digital compex 8 is connected to each place to measure the level of each place during the lift-up, and these measured values are displayed on the centralized display board 81. In addition, the three-dimensional surveying instrument 9 is arranged in the periphery to confirm the position of the temporary catwalk receiver 61. Each electric chill hole 7 above
Is a simultaneous centralized remote control type electro-hydraulic chill hole, and as shown in FIGS. 10 and 13, all are controlled simultaneously by the centralized control panel 73 based on the display of the centralized display board 81.

(2) When each of the electric chill holes 7 is operated, the catwalk 3-a is raised to the lower chord member 211 of the roof truss 21, and the catwalk 3-a is changed to the lower chord member 211. It is fixed through the hanging member 4. For this fixing, as described above, the hanging bars 43 and the hanging bars 44 of the hanging members 4 of the hanging members 4 are provided on the roof truss 21 side, and the receiving beams 41 and the hanging pipes 42 are cated. Since they are preliminarily attached to the walk 3 side, these may be docked after the lift-up is completed.

(3) After fixing a series of catwalks 3-a, the temporary catwalk receiver 61 is separated, and
The balance of each load balancer 62 is transferred to the center of the temporary catwalk receiver 62, and the temporary catwalk receiver 61 is lifted down. In this case, FIG.
As shown in 4, the sling wire 72 is also placed in the center. After that, the entire temporary mount 6 including the temporary catwalk receiver 61 is dismantled and removed, and all the electric chill holes 7 and the like are also removed, and the work is completed.

The two catwalks 3-a in the frontal direction may be lifted up and fixed not only individually but simultaneously.

The one catwalk 3-b in the middle portion in the depth direction is the catwalk 3-a in the front direction.
You can lift up at the same time and fix it,
You may lift up and fix separately. In the case of separate cases, it may be performed in the same manner as the catwalk 3-a in the frontage direction.

Next, the construction procedure for the two c's at both ends in the depth direction of the catwalk 3 having a relatively small radius of curvature and a large degree of curvature is described in (1) (2) (3) of FIG. Through (4), (5), and (6) of FIG. Note that the points common to the previous time will be omitted from the previous description. (1) In the case of this catwalk 3-c, it is basically the same as the case of the catwalk 3-a in the frontage direction last time, but in order to prevent the temporary mount 6 from becoming extremely high,
The temporary pedestal 6 is formed by dividing it into several pieces. Therefore, the temporary catwalk receiver 61 and the catwalk 3-c
Also correspond to each and divide. In this case, each part of the catwalk 3-c is lifted up and fixed, which is the same as the previous time, but in particular, the parts that are fixed at high places are lifted up in order. (2) Lift up the first part c1 to be fixed at the first place in the high place until one end of the first part c1 is aligned with one end of the second part c2 in the second place at the high place, and join the ends of both. To coalesce. (3) The combined first portion c1 and second portion c2 are appropriately lifted up, and one end of the third portion c3, which is an additional portion, is pin-joined to the other end of the first portion c1 in a standing posture, and the third portion The part is rotated to a predetermined position and integrated. (4) The combined first part c1 to third part c3 are lifted up until the other end of the second part c2 is aligned with one end of the fourth part c4 at the third place in the high place, and both ends are joined together. And combine. Also, at this time, the fifth portion connected to the other end of the fourth portion c4.
The portion c5, that is, the end portion of the catwalk 3-c is attached to the lower chord member 211 of the end portion of the roof truss 21 by the hanging member 4
Assemble through. (5) The combined first portion c1 to fourth portion c4 are lifted up to the lower chord member 211 of the roof truss 21 and fixed to the lower chord member 211 via the hanging member 4, and
The other end of the portion c4 and one end of the fifth portion c5 are joined and integrated. However, in the fourth part c4 of the temporary mount 6,
Since the fourth portion c4 is small, it is not necessary to raise the temporary catwalk receiver 61. (6) After fixing a series of catwalks 3-c, the temporary catwalk receiver 61 is separated and lifted down.

[0022]

According to the first aspect of the present invention, the catwalks in the required areas are appropriately grounded in series on the temporary mount, and the necessary equipment to be mounted on the catwalks is also grounded. The whole is placed on a temporary frame, hoisted, fixed on the roof truss, and then the temporary frame is lowered, so both the installation of the catwalk in the required area and the installation of the necessary equipment and equipment are grounded together. However, it can be lifted and rationalized, and it can be installed in a short time, and all the installation can be completed in one day. Therefore, the construction period can be shortened, the accuracy can be improved, the cost can be reduced, and the safety can be improved.

According to the second aspect of the present invention, since the temporary pedestal adapted to the roof truss form is assembled under the roof truss in the required area, the catwalk to be attached to the required area of the roof truss on the temporary pedestal is formed in series. Not only can it be easily grounded, but the necessary equipment and fixtures attached to the catwalk can also be easily grounded, and since the temporary catwalk receiver is placed on the upper surface of the temporary base, a series of grounding can be performed on the temporary base. The catwalk and all of the equipment that is grounded on the catwalk can be placed on the temporary catwalk receiver for easy lifting, reducing the number of lifting machines and facilitating lifting management. It can be lifted in time and installed easily, and of course all installation can be completed in one day, thus shortening the construction period and improving accuracy. Can Mel can reduce the cost, it is possible to improve safety. In addition, a load balancer is installed in the temporary catwalk receiver at the place where an unbalanced load is generated during lifting to perform the required balance adjustment, so even if it is an accessory that does not have structural strength, Can be easily and accurately lifted while maintaining a correct posture without being twisted or offset due to an unbalanced load, and after fixing the catwalk to the roof truss, balance each load balancer to the center. As a result, the temporary catwalk receiver is lowered, so that the temporary catwalk receiver can be lowered stably and safely.

According to the third aspect of the present invention, since the temporary pedestal, which is divided into several pieces in conformity with the roof truss form, is assembled under the roof truss in the required area, the roof truss having a high degree of bending and the like can be used. Even if the roof truss is subject to many changes, the temporary stand can be lowered, and the catwalks of each section attached to the required area of the roof truss on the section temporary stand can be easily grounded. Necessary equipment and fixtures attached to the catwalk of the section can be easily grounded, and construction safety can be promoted, and the temporary catwalk receiver for each section can be placed on the upper surface of the sectioned temporary stand. Therefore, the catwalk that is erected on the temporary mount of each section and the equipment and tools that are erected on the catwalk are respectively attached to the temporary catwalk of each section. It can be lifted easily by placing it on the rack receiver, reducing the number of lifting machines and facilitating the management of lifting. Moreover, when lifting, the catwalk or equipment of each section is lifted in sequence. As a result, the roof trusses, which have a large degree of bending, are joined because they are joined and united in the process of lifting, and finally the ones that are connected in series are hoisted to the roof truss as a whole and settled on the roof truss. Even for roof trusses that vary in height, it can be lifted in a short time and easily installed, and all the installation can be completed in a day. Compared with the simple one, the construction period can be remarkably shortened, the accuracy can be improved, the cost can be reduced, and the safety can be improved. In addition, since the temporary catwalk receiver is equipped with a load balancer at the place where an unbalanced load is generated during lifting to perform the required balance adjustment, even if it is an accessory that does not have structural resistance, Can be lifted easily and accurately while maintaining a correct posture without twisting or deviation due to unbalanced load.
After fixing the catwalk to the roof truss, the load balancers are balanced to the center to lower the temporary catwalk receiver, so that the temporary catwalk receiver can be stably and safely lowered.

According to the invention of claim 4, in the invention of claim 1, claim 2 or claim 3, the receiving beams are crossed and joined to the lower surface of each part of the catwalk. Since the catwalk is fixed to the roof truss by suspending both ends on the roof truss with hanging materials, respectively, the catwalk has a planar shape and is linear, whereas the roof truss to which the catwalk is attached is three-dimensional. Even if it has a curved surface that changes dynamically and has a flat shape or a curved lower chord member, the crossing angle and intersection of the beam can be changed arbitrarily according to the lower chord member, and it can be easily installed without trouble. Yes, therefore the catwalk does not have to be of a special shape to accommodate its truss roof, existing ones can be used, which is very economical.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, a suspension bar for attaching the suspension material to the roof truss, and a suspension rod for suspending both ends of the receiving beam by suspending from both ends of the suspension bar. And a suspension pipe that hangs from the middle portion of the suspension bar and suspends both ends of the receiving beam, the suspension bar and the suspension rod are preliminarily attached to the roof truss side, and the receiving beam and the suspension pipe are provided. Since the catwalk is attached first to the catwalk side, the lifted catwalk can be easily attached only by combining the hanging materials, and can be easily fixed in a short time.

[Brief description of drawings]

FIG. 1 is a front view of an applied building showing an embodiment of a catwalk lift-up method according to the present invention.

FIG. 2 is a side view of the building.

FIG. 3 is an explanatory plan view showing a roof truss of the same building and a catwalk fixed to the roof truss.

FIG. 4 is a cross-sectional view of the catwalk of the same example.

FIG. 5 is an explanatory plan view of essential parts showing a mounted state of the catwalk of the same example.

FIG. 6 is a process drawing of a lift-up construction method related to the catwalk in the frontage direction in the same example.

FIG. 7 is an enlarged view of a main part of FIG.

FIG. 8 is a process diagram of the first half of a lift-up method for a catwalk in the depth direction of the example.

FIG. 9 is a process chart of the latter half of FIG.

FIG. 10 is a sectional view specifically showing a lift-up state of the catwalk of the same example.

FIG. 11 is a cross-sectional view specifically showing the temporary mount of the same example, the catwalk on the temporary mount, and the ground structure of the equipment.

12 is an enlarged cross-sectional view of the main part of FIG.

FIG. 13 is a control system diagram for the electric chill hall of the same example.

FIG. 14 is a cross-sectional view showing a temporary catwalk receiver at the time of lifting down in the same example.

[Explanation of symbols]

1 ... Large space structure 2 ... Truss roof 21 ... Roof truss 211 ... Lower chord material 3 ... Cat walk a ... Cat walk in frontage direction b ... Cat walk in middle in depth direction c ... Cat walk at end in depth direction 4 … Suspension member 41… Receiving beam 42… Suspension pipe 43… Suspension bar 44… Suspension bar 5… Equipment 6… Temporary stand 61… Temporary catwalk receiver 611… Horizontal pipe truss 612… Vertical pipe truss 613… Large catch jack 62… Load balancer 621… Guide rail 622… Weight 63… Base support 631… Frame 632… Overhang jack 633… Steel pipe 634… Staff scaffolding board 635… Handrail 636… Baseboard 7… Electric chill hole 71… C hook 72… Sliding Wire 73 ... Centralized control panel 8 ... Digital Compex 81 ... Centralized display board 9 ... Three-dimensional survey instrument

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoki Ueura 21-21 Ginza, Chuo-ku, Tokyo Takenaka Corporation Tokyo Main Store

Claims (5)

[Claims] 1. A catwalk in a required area to be fixed to a roof truss is appropriately grounded in series on a temporary mount, and required equipment and devices to be mounted on the catwalk are also grounded, and the whole of these is used as a temporary mount. The catwalk lift-up method is characterized by placing and lifting the catwalk, fixing the catwalk to the roof truss, and then lowering the temporary stand. 2. A temporary truss adapted to a roof truss form is assembled under a roof truss in a required area, a temporary catwalk receiver is provided on an upper surface of the temporary truss, and the area is placed on the temporary catwalk receiver. While constructing a series of catwalks to be fixed on the roof truss of
The required equipment is assembled to the catwalk, and a load balancer is provided at the temporary catwalk receiver at a place where an unbalanced load is generated to adjust the required balance, and then the series of catwalks or equipment described above. Place it on the temporary catwalk tray and lift it up,
A catwalk lift-up method, characterized in that after fixing the catwalk to a roof truss, each of the load balancers is balanced in the center to lower the temporary catwalk receiver. 3. Assembling a temporary pedestal, which is divided into several parts, adapted to the roof truss form, under the roof truss in the required area,
Temporary catwalk receivers are placed on the upper surface of the temporary stand for each section, and the catwalks to be fixed to the corresponding roof trusses on the temporary catwalk receivers of each section are grounded, and at the same time, for each section. Attach the required equipment to the catwalk, and
The temporary catwalk receiver is equipped with a load balancer at the place where an unbalanced load is generated to perform the required balance adjustment, and then the catwalk or equipment of each of the above sections is placed on the temporary catwalk receiver of each section in order. Then, the roof trusses are hoisted to the roof truss as a whole, and then the load balancers are fixed. The catwalk lift-up method characterized by lowering all of these temporary catwalk receivers by balancing them to the center. 4. The catwalk is formed by crossing and joining receiving beams to the lower surface of each part of the catwalk, and suspending the catwalk on the roof truss by suspending both ends of these receiving beams with a roof truss, respectively. The lift-up method for a catwalk according to claim 1, claim 2 or claim 3. 5. A suspension bar for attaching a suspension member to a roof truss, a suspension bar for suspending both ends of the receiving beam by suspending from both ends of the suspension bar, and both ends of the suspending beam for suspending from the intermediate portion of the suspension bar. 5. The cat according to claim 4, which comprises a hanging pipe for hanging, the hanging bar and the hanging rod are attached to the roof truss side in advance, and the beam and the hanging pipe are placed in advance to the catwalk side. Walk lift-up method.