JP2001173098A - Mobile frame trestle for constructing dome-like roof and construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with a constructing frame trestle and timbering for supporting a steel skeleton truss top part to facilitate measurement and correction of the position of split truss units to be sequentially connected in a no- timbering construction method, and to secure safety of a high-lift work. SOLUTION: After a new split unit 46 is put in the connecting state on a working bench 1 connected to an existing part of a roof frame 45, a suspending wire 26 is connected to the existing part of the roof frame, and a lifting wire 27 is connected to the adjacent existing split unit in the circumferential direction. After the working bench is lowered to a designated height by winch driving for the suspending wire 26, the working bench is lifted by winch driving for the lifting wire 2, thereby turning the load of the working bench from the suspending wire to the lifting wire to move the working bench in the circumferential direction. A further new split unit is sequentially connected to the moved working bench to form a circumferential ring in the inner periphery of the existing part. This operation is repeated to form a dome-like roof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable work gantry used for constructing a dome-shaped roof, and a roof construction method using the same.

[0002]

2. Description of the Related Art When constructing a dome-shaped roof, it is common to assemble a temporary gantry that supports the entire roof, and assemble a steel truss on the temporary gantry. In this case, however, the cost of the temporary gantry is high. There is a problem that the internal construction cannot be performed until the roof construction is completed. To cope with this, as shown in JP-A-3-260237, a erection gantry is built at the center of the erection area of the roof, and a temporary gantry extending in the centrifugal direction from the erection gantry is temporarily installed at a part of the erection area. Roller bearings with jacks are provided on the upper surfaces of the temporary gantry and the lower structure that supports the roof, and one or several frame units are erected between the erection gantry and the lower structure from a desired position in the erection range. There has been proposed a construction method in which all the frame units are radially arranged to form a dome frame by sequentially rotating the frame units constructed around the frame. On the other hand, in the case of construction of relatively small roofs, the unsupported construction method of assembling steel trusses without using temporary gantry is performed, and this can be applied to construction of large-scale roofs. It is considered.

[0003]

In the above-mentioned known example, there is a problem that a large-scale facility such as an installation gantry constructed from the ground or a roller bearing with a jack is required. On the other hand, in the unsupported construction method, since there is no support point for supporting the steel truss from below, it is difficult to measure and correct the position of the split truss unit when assembling the steel truss, and a great deal of labor is required. Since it is performed on a truss, there is a problem in safety at the time of work at a high place.

[0004] The present invention eliminates the need for a gantry or the like for supporting the roof frame top by sequentially connecting the division units to form a roof frame, and also assembles the division units on a movable gantry. In addition to facilitating the position measurement and position correction of the divided unit, the safety of work at height is also ensured.

[0005]

As a first means, the present invention relates to a gantry used for constructing a dome-shaped roof in which a roof frame 45 is formed by a plurality of divided units 46.
Has a work table 1 connected to the lower surface of the existing part via a connecting member 16 and the other half has a work table 1 protruding from the lower surface of the non-installed part. Angle adjusting means which is arranged between a plurality of bases 2, 3, 4 pivotally mounted on the base and a pair of bases adjacent to each other, and which can freely set the mutual inclination angle of the upper surfaces of the pair of bases to an arbitrary angle. 10 and a platform located in one half of the work table 1 is a suspension wire 26.
Is wound around the plurality of first winches 25a and the lifting wires 2
7 is wound, a plurality of second winches 25b are wound, the hanging wire 26 has a first clamp member 35a that can be freely connected to the lower surface side of the existing portion of the roof frame, and the lifting wire 27 is connected to the existing portion. Division unit 46 connected to the inner end
Has a freely connectable second clamp member 35b on the lower surface side of
After the connecting member 16 of the work table 1 is released and the work table is suspended to a predetermined height by the winch drive for the hanging wire 26, the work table is lifted by the winch drive for the lifting wire 27, whereby the work table is lifted. The work table was provided so as to be movable in the circumferential direction or inward by changing the load from the wire 26 to the lifting wire 27.

As a second means, in a method of constructing a dome-shaped roof in which a roof frame 45 is formed by a plurality of divided units 46, an outer peripheral portion of the roof frame 45 is assembled on a separately provided temporary gantry. The temporary gantry is removed, one half of the work table 1 is connected to the lower surface of the existing part of the roof frame, and the other half is protruded to the lower surface of the uninstalled part, and on the work table,
A new split unit 4 at the inner end of the existing part of the roof frame
6 and the suspension wire 26 and the suspension wire 27 attached to the work table 1 via a winch, the suspension wire 26 is arranged on the lower surface side of the existing portion of the roof frame, and the suspension wire 26 is In the direction, the work table is connected to the existing portion or the lower surface side of the divided unit 46 newly connected, the connection of the work table to the roof frame is released, and the work table is driven to a predetermined height by a winch drive for the hanging wire 26. After hanging down, the work table is lifted by the winch drive for the lifting wire 27,
After lowering the load on the work platform, changing the wires from lifting wires to lifting wires, moving the work platform in the circumferential direction or inward, connecting the moved work platform to the roof frame, and then creating a new split unit on the work platform Sequential connection forms a circumferential ring or a radially extending arched steel truss.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A movable gantry for dome-shaped roof construction according to the present invention will be described below with reference to an embodiment shown in the drawings. Reference numeral 1 denotes a work table, which is formed of three table parts 2, 3, and 4, each of which is a pair of upper plate 5 and lower plate 6, which are arranged in parallel at predetermined intervals vertically, and both plates. There are a plurality of connecting swash plates 7 arranged in a zigzag shape and connecting the upper and lower plates to each other.

Each of the bases 2, 3, 4 is arranged in a line in front and rear,
The upper plates 5 of the bases 2 and 4 located at the front and rear ends are pivotally attached to the front and rear sides of the upper plate 5 of the base 3 located at the center via hinges 8 and 8 so as to be swingable. The lower plates 6 of the two base portions 2 and 4 are connected to the front and rear sides of the lower plate 6 of the central base portion 3 via a pair of left and right hydraulic jacks 10 and 10. The hydraulic jacks 10 and 10 are pivotally connected between adjacent lower plates 6 via hinges. Also, three pillars 1 from the front and rear sides of the upper plate 6 of the rear end platform 4 and the central platform 3 respectively.
4 and the upper ends of these three columns are connected by a horizontal H-shaped steel 15 extending in the left-right direction.

Reference numeral 16 denotes connecting members provided on both right and left portions of each H-shaped steel 15. A first clamp 18 having a groove shape which can be fixed to the H-shaped steel 15 via a fastening bolt 17, and provided on an upper surface of the clamp. And a groove-shaped second clamp 21 connected to the gap adjusting section via a universal joint 20, and the second clamp is connected to a T-shaped truss 45 of a steel truss 45 described later via a tightening bolt 22. It can be fixed to the horizontal plate of the first mounting portion 51 in the shape of a letter. The interval adjusting section 19 adjusts the interval between the first clamp 18 and the second clamp 21. In the present embodiment, the upper surface of the first clamp 18 and the universal joint 2 are adjusted.
0 and a threaded rod 19b with an operating rod screwed into both ends of the female screw cylinder, and the rod 19 is inserted through the operating rod.
By turning b, the interval can be adjusted.

Reference numerals 25a and 25b denote winches, and
A pair of the lower plate 6 is installed at each of four corners side by side in the front-rear direction. Among them, a hanging wire 26 is attached to a winch 25a located on the rear side, and a winch 26 located on the front side.
A lifting wire 27 is wound around b. Each wire extends through the through-hole 28 formed in the upper plate 5 to extend above the central pedestal 3, and further, a sheave 29 (see FIG. 1) provided in the upper plate 5.
The direction can be freely changed via (omitted). In addition,
Although the winches 25a and 25b are provided at the four corners of the lower plate 6 in the above description, this is in consideration of the stability at the time of raising and lowering the work table. Therefore, three places may be used as long as the stability is secured. Or five or more locations.

The sheave 29 has four rollers 31 arranged in a rectangular shape when viewed from above in a peripheral wall 30 surrounding the through hole 28, and a space surrounded by these four rollers communicates with the through hole 28. Let me. The wire extending from the space can be smoothly turned by engaging one of the rollers.

Reference numerals 35a and 35b denote clamp members for wires. A U-shaped clamp 38 is provided at each of the distal ends of a pair of connecting rods 37 which are swingably attached to the distal ends of the wires 26 and 27 via metal fittings 36. Has been pivoted. A horizontal plate of a T-shaped second mounting portion 52 hanging from a steel truss 45 described later is fitted into the groove of each of the clamps, and the tightening bolt 40 is inserted.
To connect the wires 26 and 27 to the steel truss.

Reference numeral 45 denotes a plurality of steel trusses as a roof frame. Each steel truss is formed from a plurality of divided truss units 46. Each unit includes an upper chord 47, a lower chord 48, and a lattice material disposed therebetween. The first attachment portion 51 for the connecting member and the second attachment portion 52 for the wire are suspended from the lower surface of the lower chord material 48.

Next, a method of constructing a dome-shaped roof will be described. The structure of the dome-shaped roof includes various structures such as a radial shape, a matrix shape, and an orthogonal lattice shape. In each case, as shown in FIG. 8, circumferential rings are assembled one by one from the outer periphery to the inner periphery. Generally, this embodiment uses the movable gantry according to the above-described configuration to perform the construction according to the following procedure.

(1) Using a separately provided temporary gantry (not shown), the divided truss units 46 to be the outer peripheral portion of the dome-shaped roof are arranged in the circumferential direction and assembled in a ring shape to form the outermost outermost truss unit. After forming one ring 46a,
Similarly, a second ring 46b is formed on the inner periphery of the ring, and a third ring 46c is formed on the inner periphery of the ring.

(2) After removing the temporary gantry, the workbench 1 is placed next to an arbitrary row S (see FIG. 8) in the radial direction of the divided truss units 46 constituting each ring assembled by the method of (1). Connect as follows. First, the hydraulic jack 10
The angle of the work table 1 is adjusted by the expansion and contraction of the work table 1 so as to substantially match the curvature of the row S. Next, while adjusting the interval between the first and second clamps 18 and 21 by the interval adjuster 19, the first clamp 1
8 is attached to the H-shaped steel 15, and the second clamp 21 is attached to the first mounting portion 51, and tightened with the tightening bolts 17 and 22. At this time, the platform 2 of the work table 1 is protruded more inward than the divided truss unit 46 located at the innermost periphery of the row S.

(3) A new split truss unit 46 to be connected to the inner end of the row S to which the work table 1 is attached as described above is placed above the base 2 of the work table 1 as shown in FIG. It is hung at 53, and this is connected by a worker on the workbench.

(4) The suspension wire 26 is connected to the divided truss unit located at the center of the row S, and the suspension wire 27 is extended in the circumferential direction as shown by a two-dot chain line in FIG. , Adjacent to each other in the circumferential direction and connected to the divided truss units belonging to the third ring 46c.

(5) After the connecting member 16 is released, the wire is unwound by the operation of the winch 25a around which the hanging wire 26 is wound, as shown in FIG. The wire is wound up by the operation of the winch 25b around which the lifting wire 27 is wound to change the load. The work table 1 is moved below the row of divided truss units adjacent to the row S in the circumferential direction by the winding of the wire. The suspension distance of the work table is set in a range in which the load can be changed.

(6) After moving the work table 1 in the circumferential direction by winding the wire, the work table is connected to the row of divided truss units located above the work table by the method (2).

(7) Thereafter, by repeating (3) to (6), the split truss units are connected in the circumferential direction, and a new ring is formed on the inner circumference of the existing split truss unit.

(8) After forming a new ring, the work table 1 is advanced inward to form a new ring on its inner periphery. To move the work table 1 forward, the hanging wire 26
Is connected to the innermost unit of the split truss units forming the row S, and to a new split truss unit in which the lifting wire 27 is connected to the inner end of the row S.

(9) Next, the work table 1 is moved inward by changing the load according to the method of (5).
After the platform 2 of the workbench protrudes inward from the newly formed ring, the workbench is connected by the method (2).

(10) Thereafter, (3) to (6) are repeated to form a new ring on the inner periphery of the new ring.

In the above description, an example in which the present invention is applied to a method of constructing a roof frame by assembling a ring formed by arranging a plurality of divided truss units in the circumferential direction one by one from the outer periphery to the inner periphery. However, the present invention is not limited to this, and a plurality of split truss units are sequentially connected in the radial direction to form an arch-shaped steel truss extending in the radial direction, and the steel trusses are assembled one by one in the circumferential direction to form a roof frame. It is also possible to apply to the construction method. In this case, the hanging wire 2
6 is connected to the existing split truss unit, and the lifting wire 27 is connected to the newly connected split truss unit. In this way, the workbench 1 always moves inward, not in the circumferential direction, by changing the load.

[0026]

According to the first and second aspects of the present invention, a roof frame is formed by sequentially connecting an undivided unit to an existing unit, so that a frame supporting the frame top is unnecessary. Moreover, it is necessary to raise and lower the roof frame,
Since there is no need to rotate and move, there is no need for a roller support with a jack for a roof frame, and the cost can be reduced. In addition, since the division unit is assembled on a movable gantry, position measurement and position correction of the division unit are easy,
In addition, the safety of working at heights is ensured.

[Brief description of the drawings]

FIG. 1 is a perspective view of a movable gantry for dome-shaped roof construction according to the present invention.

FIG. 2 is a cross-sectional view of the connecting member.

FIG. 3 is a plan view of a sheave.

4 is a side sectional view of FIG. 3;

FIG. 5 is a partial cross-sectional view of the wire clamp member.

FIG. 6 is a schematic diagram showing a state where a movable gantry is set on a roof frame.

FIG. 7 is an explanatory view showing the state of changing the load.

FIG. 8 is an explanatory view of a dome-shaped roof construction method according to the present invention.

[Description of Reference Numerals] 1 work table 2, 3, 4 base unit 10 angle adjusting means 16 connecting member 25a, 25b winch 26 hanging wire 27 lifting wire 35a, 35b clamp member 45 roof frame 46 division unit

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kenichi Miyazaki 1-5-1, Otsuka, Inzai City, Chiba Prefecture Inside the Research Institute of Takenaka Corporation (72) Inventor Hidetoshi Hayashida 1-5-1, Otsuka, Inzai City, Chiba Prefecture Takenaka Corporation Technical Research Institute, Inc. (72) Inventor Oka Hideo 1-5-1, Otsuka, Inzai City, Chiba Prefecture In-house Takenaka Corporation Technical Research Institute, (72) Inventor Daisaku Sozo, Otsuka 5-chome, Inzai City, Chiba Prefecture Address 1 F-term in Takenaka Corporation Technical Research Institute (reference) 2E174 AA01 BA05 CA03 CA12 CA16 CA35 CA38 DA11 DA24 DA58 EA03

Claims (2)

[Claims] 1. A gantry used for constructing a dome-shaped roof in which a roof frame 45 is formed by a plurality of divided units 46. One half of the roof frame 45 is provided on a lower surface side of an existing portion of the roof frame 45 via a connecting member 16. The other half has a work table 1 protruding from the lower surface side of the non-installed part, and the work table has a plurality of bases 2, 3, 4 pivotally connected to each other, An angle adjusting means 10 disposed between a pair of adjacent bases and capable of setting the mutual inclination angles of the upper surfaces of the pair of bases to an arbitrary angle; The pedestal portion has a plurality of first winches 25a around which a hanging wire 26 is wound and a plurality of second winches 25b around which a lifting wire 27 is wound. The hanging wire 26 is a lower surface of an existing portion of a roof frame. Has a first clamp member 35a which can be freely connected to the side, and is lifted. The wire 27 has a freely connectable second clamp member 35b on the lower surface side of the division unit 46 connected to the inner end of the existing portion, releases the connection member 16 of the worktable 1, and winches for the hanging wire 26. After the workbench is suspended to a predetermined height by driving, the workbench is lifted by a winch drive for the lifting wire 27, so that the load on the workbench is suspended, the wire 26 is changed to the lifting wire 27, and the workbench is moved in the circumferential direction. Alternatively, a movable work gantry for dome-shaped roof construction, which is provided so as to be movable inward. 2. A method of constructing a dome-shaped roof in which a roof frame 45 is formed by a plurality of divided units 46. In the method for constructing a dome-shaped roof, an outer peripheral portion of the roof frame 45 is assembled on a separately provided temporary gantry, and then the temporary gantry is removed. Then, one half of the worktable 1 is connected to the lower surface side of the existing portion of the roof frame, and the other half is protruded to the lower surface side of the non-installed portion. A new split unit 46 is connected to the end, and of the hanging wire 26 and the lifting wire 27 attached to the work table 1 via a winch, the hanging wire 26 is attached to the lower surface side of the existing portion of the roof frame, In addition, the lifting wire 27 is connected to the existing portion adjacent to the circumferential direction or to the lower surface side of the newly divided unit 46 which is newly connected, and the connection of the work table to the roof frame is released. After the workbench is suspended to a predetermined height by the winch drive for lifting, the worktable is lifted by the winch drive for the lifting wire 27, so that the load on the worktable is changed from the hanging wire to the lifting wire, and the workbench is rotated. After moving the workbench to the roof frame after moving it in the direction or inward, a circular ring or an arch-shaped steel frame extending in the radial direction is obtained by sequentially connecting new division units on the workbench. A dome-shaped roof construction method characterized by forming a truss.