JP2000186310A - Method for erection of structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for erection of a structure which can dispense with large-scale equipment for temporary erection and enables safe and easy transfer and mounting of structural members without impairing cables. SOLUTION: On the occasion of erection of a structure so constituted as to support structural members 3 including horizontal girders and floor slabs by cables 2 stretched across between anchor blocks 1, the cables 2 are stretched, with a prescribed space held, between the anchor blocks 1 and tightened and then, with these cables 2 used as rails, the structural members 3 are carried in a sliding manner from one anchor block 1 side to the other anchor block 1 side by means of bearing members 5 with pulleys fitted slidably to the cables 2. Subsequently, the structural members 3 are fixed to the cables 2 by metal fittings.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure in which a cable is used as a supporting structural member, such as a pedestrian bridge composed of various structural members such as cross beams and floor slabs. Easily and safely transport structural members by transporting the structural members alone or connected along the cable, or by transporting the structural members with the temporary rope tensioned and then tensioning the cable after transferring the structural members. The present invention relates to a method of erection of a structure that can be transported and installed in a building.

[0002]

2. Description of the Related Art FIGS. 11 and 12 show two conventional examples of a construction method using a cable as a supporting structural member. The first example of FIG. 11 is a construction method in a case where the span between the anchor blocks 1 is as short as about 40 m. Above the safety net 21 stretched between the anchor blocks 1,
First, a pair of cables 2 are stretched in parallel at a predetermined interval and both ends are fixed to the anchor block 1.
And was attached to both cables 2.

On the other hand, a second example shown in FIG.
It is a construction method in case of long length, but each anchor block 1
A rope crane 25 using a temporary rope 26 is attached to a stay rope 24 passed between the temporary towers 23 erected above, and a rope crane 25 traveled by operating a winch 27.
As a result, the structural member 3 such as a girder is lifted and moved, and attached to both cables 2.

[0004]

In the first example, the horizontal distance is limited to about 25 m even with a large tow truck.
The length of the target structure is limited and the versatility is poor. In addition, the installation work of the structural member on the cable 2 or on the temporary scaffold provided on the cable 2 is performed by an expert technician who has mastered the work at height. There is a problem that it is not only necessary but also dangerous. In the second example, the construction of the rope crane 25 using the temporary tower 23 and the temporary rope 26 requires a great deal of labor and installation time to increase the construction cost, and also involves the dangerous work of a professional engineer. It was a problem.

The present invention has been made in order to solve such problems, and an object of the present invention is to eliminate the need for large-scale temporary equipment conventionally required and to reduce the number of cables. An object of the present invention is to provide a method of erection of a structure in which a structural member can be moved and mounted safely and easily without being damaged.

[0006]

The present invention has the following configuration to achieve the above object. In other words, the invention of claim 1 according to the present invention is to construct a structure constructed by supporting a structural member 3 including a horizontal girder and a floor slab by a cable 2 stretched between anchor blocks 1. After stretching between the anchor blocks 1 while maintaining a predetermined interval, the cable 2 is used as a rail, and a structural member 3 is slidably attached to the cable 2 via a pulley-supporting member 5. This is a method for constructing a structure, characterized in that the structure is slid from one anchor block 1 side to the other anchor block 1 side and transported, and then the structural member 3 is fixed to the cable 2 by a mounting bracket 7.

According to a second aspect of the present invention, there is provided the unit structure according to the first aspect, wherein the structural member 3 for transporting the cable 2 by using the cable 2 as a rail is formed by itself or as a floor assembly. 3U and one anchor block 1
This is a method for constructing a structure, characterized in that the structure is laid one after another by being repeatedly pulled in from the side to the other anchor block 1 by the transfer rope 6.

According to a third aspect of the present invention, there is provided the unit structure according to the first aspect, wherein the structural member 3 for transporting the cable 2 by using the cable 2 as a rail is formed by itself or as a floor assembly. 3U is a connecting structure 3C in which one of the anchor blocks 1 is sequentially connected to the other anchor block 1 side. This is a method for erection of structures.

The invention according to claim 4 according to the present invention relates to the invention according to any one of claims 1 to 3 described above.
The bearing member 5 with a pulley is provided on the supported structural member 3 with respect to the pulley 8.
And a support level adjusting function capable of adjusting a height-direction support level.

According to a fifth aspect of the present invention, there is provided a structure for supporting a structural member 3 including a cross beam and a floor slab by a cable 2 stretched between anchor blocks 1, A cable 2 holding a predetermined interval and a temporary rope 4 arranged with the width center line inside or outside the cable 2 are stretched between the anchor blocks 1,
After tensioning the temporary rope 4, the temporary rope 4 is used as a rail, and the structural member 3 is slidably attached to the temporary rope 4 via a pulley-supporting member 5 from one anchor block 1 to the other. After sliding and transporting to the anchor block 1 side, and then introducing a predetermined tension to the cable 2,
This is a method of constructing a structure, which comprises transferring a structural member 3 to the cable 2.

According to a sixth aspect of the present invention, in accordance with the fifth aspect of the present invention, there is provided a unit structure in which the structural member 3 for transporting by using the temporary rope 4 as a rail is formed alone or as a floor assembly. Body 3U, from one anchor block 1 side to the other anchor block 1 side.
And a method of constructing a structure characterized in that the structure is transported sequentially by being repeatedly retracted.

According to a seventh aspect of the present invention, in accordance with the fifth aspect of the present invention, there is provided a unit structure in which the structural member 3 for transporting by using the temporary rope 4 as a rail is formed alone or as a floor assembly. A connecting structure 3C in which the bodies 3U are sequentially connected on one anchor block 1 side. The connecting structures 3C are conveyed in a lump by being pulled in from one anchor block 1 side to the other anchor block 1 side by a conveying rope 6. This is a method for erection of structures.

The invention according to claim 8 of the present invention is characterized in that a cross beam,
In erection of a structure constituted by supporting the structural member 3 including the floor slab, the temporary rope 4 is anchored so that the width center line is inward or outward with respect to the extending position before the cable 2 is extended. After being stretched and tensioned between the blocks 1, the structural member 3 is fixed to the cable 2 to be stretched from one anchor block 1 to the other anchor block 1, and the structural member 3 is fixed to the cable 2. Further, the temporary rope 4 is slidably supported via a pulley-attached support member 5, and the temporary rope 4 is used as a rail, so that the stretching of the cable 2 and the transport of the structural member 3 are performed in parallel. A method of erection of a structure characterized by removing a temporary rope 4 from a structural member 3 and pulling it in after removing a predetermined tension.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

FIGS. 1 and 2 are schematic explanatory views of a method of erection of a structure according to a first embodiment and a second embodiment of the present invention, respectively. FIG. FIG. 4 is a perspective view showing a mode of transporting a structural member in the method of erection of the structure, and FIG. 4 is a front view corresponding to FIG. 3 showing a transport state of (A) and an attached state of (B). It is indicated with a distinction.

Referring to FIG. 1, FIG. 3 and FIG. 4, a structure to which the erection method according to the first embodiment is applied includes a structural member 3 such as a horizontal girder, a vertical girder, a floor slab, a railing or the like. It is a suspended structure represented by a suspended deck bridge supported by a pair of cables 2 stretched between anchor blocks 1, for example. The illustrated example is a bridge belonging to a pedestrian bridge having a bridge length of 50 m. The width is 2 m. The design load loaded on the girder of this pedestrian bridge is a motorcycle B having a mass of 350 kg. The cable 2 at this time is a strand rope 7 × 19, φ50 mm
Is used. The anchor blocks 1 at both ends of the cable 2 are made of concrete and have a height of 5 m, a width of 9 m, and a depth of 5 m.

In erection of the above-mentioned pedestrian bridge, a transport rope 6 and a winch 9 are used, and a small wrecker 10 (see FIG. 2) is optionally used if necessary. First, the pair of cables 2 are stretched between the anchor blocks 1 while maintaining a predetermined interval, and are tensioned by introducing a predetermined tension. Next, a single structural member 3 including the horizontal girder 3A and the vertical girder 3B is formed, or as shown in FIG. 3, for example, a floor set of each structural member 3 including the two horizontal girder 3A and the vertical girder 3B. The unit structure 3U is conveyed by sliding from one (right) anchor block 1 side to the other (left) anchor block 1 side using the pair of cables 2 as rails.

In this case, a single unit of the structural member 3 or the unit structure 3U is laid over both cables 2 on the anchor block 1 on the right side. Small wrecker 10
On both cables 2. At that time, the unit structure 3
As shown in FIG. 3, U is laid over both cables 2 via a total of four pulley-supported members 5, each of which is slidably attached to a pair of cables 2.

The unit structure 3U is transported by using the winch 9 installed on the anchor block 1 on the left side, and pulling in the transport rope 6 whose end is connected to the unit structure 3U. . In this way, the unit structure 3U
Reaches the left end of the pair of cables 2, the unit structure 3U is fixed to the pair of cables 2 by the mounting bracket 7 (see FIG. 4), and the pulley-supporting member 5 is removed, while the transport rope 6 Is untied and connected to a return rope (not shown), the winch 9 is rewound and the return rope is dragged on the right anchor block 1 side, and the next unit structure 3U is transported in the same manner. Let them do the trick.

Since the transport of the unit structure 3U is a ground operation performed on both anchor blocks 1, it is a safe operation that does not involve an altitude operation. In addition, since the work is performed at the limited positions at both ends of the cable 2, a large-sized tow truck and a rope crane are omitted, and this is a labor-saving and economical method of installing a structure.

3 and 4 show an example of the structure of the bearing member 5 with pulleys used for transporting the unit structure 3U. The top plate portion and the left and right side plates are formed by bending a metal strip. Frame 11 formed by connecting parts with each other in an inverted U-shape
A lower lid 12 removably attached to an opening at the bottom of the frame 11 by screws or the like; and both shaft ends rotatably supported by left and right side plates of the frame 11 so as to be rotatable. The pulley 8 is disposed between the pulley 8 and the pulley 8 in the frame 11 at a position below the pulley 8 in the frame 11 so that the cable 2 can be interposed with slight play. A fall-off prevention pin 14 provided in parallel with the axis of the pulley 8 over the plate portion, a height adjustment bolt 13 fixedly mounted on the top plate portion of the frame 11, and a bolt 13 Two nuts 1 to be screwed
5 to form a pulley-incorporated support leg which supports the unit structure 3U along the pair of cables 2 as rails and can be moved by sliding.

In such a support member 5 with a pulley, a height adjusting bolt 13 is inserted into a bolt hole provided at a predetermined position of a bottom plate portion of a longitudinal girder 3B in a unit structure 3U, and the bottom plate portion is fixed with both nuts 15. It is attached to the unit structure 3U by being sandwiched. In this state, the lower cover 12 is removed, the fall prevention pin 14 is removed from the shaft hole, and the pulley 8
Then, the falling-off prevention pin 14 and the lower lid 12 are attached as before. Thus, the pulley-supporting member 5 can be attached to the cable 2 so that the pulley 8 does not come off from the cable 2, and the cable 2 can be slid smoothly on the cable 2 as a rail. In this case, the height adjusting bolt 13 and the nut 15 form a bearing level adjusting mechanism for adjusting the height direction bearing level of the supported unit structure 3U with respect to the rolling contact line of the pulley 8, and the cable 2 When the unit structure 3U is conveyed along the direction shown in FIG.
As shown in (a), a gap G that does not allow the unit structure 3U to come into contact with the cable 2 can be secured.
(B), the unit structure 3U is placed on the cable 2 and the unit structure 3U can be fixed to the pair of cables 2 by attaching the unit structure 3U to the mounting bracket 7 made of a U bolt or the like. . Thus, the cable 2
It is possible to protect the cable 2 from damage by preventing the cable 2 from contacting the cable 2 and to make the mounting operation when fixing the cable 2 to the cable 2 easy and smooth.

Next, referring to FIG. 2, FIG. 3 and FIG.
An outline of the erection method according to the embodiment will be described. In the erection method according to the second embodiment, the description of the points that are basically similar to the erection method according to the first embodiment will be omitted, and different points will be described below.
A feature of the erection method according to the embodiment is that when the structural members are transported using the pair of cables 2 as rails, the unit structures 3U are sequentially connected to one (right) anchor block 1 side. This is a construction method in which the connecting rope 3 is pulled in from one anchor block 1 side to the other anchor block 1 side by the transfer rope 6 while being formed in the connecting structure 3C, thereby being conveyed collectively.

In the case of the first embodiment, since each unit structure 3U is conveyed along the cable 2, work at a high place for connection with the next unit structure 3U at a high place at the center of the cable 2 is not required. Will be needed. In contrast, in the erection method according to the second embodiment, the winch 9 is operated on the left anchor block 1 side in accordance with the work of sequentially connecting the unit structures 3U on the right anchor block 1 side. Transport rope 6
By intermittently retracting the cable, the transport of the structural member 3 over the entire length of the cable 2 can be realized collectively, and therefore, a construction method excellent in terms of safety in that work at an unstable high place in the center can be omitted. It is.

In the erection method according to the second embodiment, after the entire transportation is completed, each operation of the actual connection of the unit structures 3U and the fixing to the cable 2 by the mounting bracket 7 is performed. The mode of the construction method at the time of transport is almost the same as that of the first embodiment.

Next, a construction method according to a third embodiment of the present invention will be described. FIGS. 5 to 9 show aspects of a method of erection of a structure according to a third embodiment of the present invention, and FIG. 5 is a schematic explanatory view showing an anchor installation (a) or transfer of a structural member to a cable. The five steps (e) are shown in order. FIG. 6 is a perspective view showing the manner of transporting the structural members. FIG. 7 is a two-sided view corresponding to FIG. 6, (a) is a front view, and (b) is a right side view. FIG. 8 is a perspective view showing a mode of transferring the structural member to the cable. 9 is a two-sided view corresponding to FIG. 8, (a) is a front view, and (b) is a right side view.

In the erection method according to the third embodiment, the structural member 3 and the cable 2 are not brought into contact at all during the transportation of the structural member 3 so as to prevent the members 2 and 3 from being damaged. This is a construction method that has a characteristic in that Hereinafter, the present method will be described according to the process order.

A. First step (installation of anchor, FIG. 5)
(See (a)): Anchors 16 for cables and ropes are installed on both anchor blocks 1 on the left and right. B. Second step (installation of cable 2, temporary rope 4, FIG. 5)
(See (b)): A pair of cables 2 and a pair of temporary ropes 4 arranged inside or outside of the cables 2 with their width center lines aligned are loosened with a large sag (sag) between the anchors 16. After stretching, only the temporary rope 4 is tensioned by the winch 9 to reduce the sag. C. Third step (transportation of the structural member, see FIGS. 5 (C), 6 and 7): The transport of the structural member 3 by the unit structure 3U or the connecting structure 3C is performed. The construction method in this case is the same as the first embodiment or the second embodiment except that the cable used as the rail in the first embodiment or the second embodiment is replaced with a temporary rope 4. The description is omitted because it is based on the outline. D. Fourth step (positioning of structural members, see FIG. 5D): Both ends of the unit structure 3U or the connecting structure 3C connected between the left and right anchor blocks 1 are aligned with both anchor blocks 1. E. FIG. Fifth step (tension of the cable 2 and attachment of the structural member, see FIG. 5 (e) FIGS. 8 and 9): a predetermined tension is introduced into the pair of cables 2 to adjust the sag to the temporary rope 4, and The structural member is transferred to the pair of cables 2. That is, the structural member is connected to the pair of cables 2 by the mounting bracket 7.
And the pulley-supporting member 5 is detached from the structural member 3. Thereafter, the temporary rope 4 is loosened and removed, and the transfer of the structural member 3 is completed.

In the case of the erection method according to the third embodiment described above, as the cable 2 to be used, a zinc-plated cable or a resin-coated cable, which is likely to be damaged during the transportation of the structural member 3, can be considered. In this case, it is preferable to use a pulley-supported member 5 as shown in FIGS. 6 to 9 in order to ensure the prevention of damage and to facilitate transportation. The member 3 can be easily removed after being transferred to the cable 2.

Next, a construction method according to a fourth embodiment of the present invention will be described. FIG. 10 is a schematic explanatory view of a method for erection of a structure according to a fourth embodiment of the present invention, which is based on three steps of (a) parallel installation of a cable spanning and transport of a structural member to (c) floor mounting. Shown in order.

The erection method according to the fourth embodiment is characterized in that the structure is erected by extending the cable 2 and transporting the structural member 3 in parallel. That is, before the pair of cables 2 are stretched, the pair of temporary ropes 4 are stretched between the anchors 16 of the anchor block 1 so that the width center lines are inward or outward (outside in the illustrated example) with respect to the stretching position. After passing over and tensioning, a cross beam 3A, which is a structural member 3, for a pair of cables 2 to be stretched from one (left) anchor block 1 side to the other (right) anchor block 1 side. Is fixed at a predetermined interval by a mounting bracket 7 such as a U-bolt, and the cross beam 3A is further slidably supported on a pair of temporary ropes 4 via a support member 5 with a pulley. By using the pair of temporary ropes 4 as rails, the stretching of the pair of cables 2 and the conveyance of the cross beam 3A are simultaneously performed (see FIG. 10A).

When the pair of cables 2 has been stretched, a predetermined tension is introduced into the cables 2, and then the pair of temporary ropes 4 is detached from the cross beam 3A, pulled in, and removed (see FIG. 10B). 10) Then, the floor slab 3D as a structural member is attached between the cross beams 3A and attached (FIG. 10 (c)).
), A series of erection methods are completed.

[0033]

According to the present invention, when a structure constructed by supporting a structural member including a cross beam and a floor slab by a cable stretched between anchor blocks, the structure is arranged along the tensioned cable. The structural member is installed by fixing the cable to the cable after transporting the member, or by transferring the structural member by tensioning the cable after transporting the structural member along the attached and tensioned temporary rope. Because of this construction method, it is possible to omit the conventionally required large-scale temporary equipment, thereby shortening the construction period and reducing the construction cost. In addition, since the erection work can be performed by the work on the ground on the anchor block side and the special work in an unstable high place can be omitted, an excellent effect is achieved in terms of work safety and simplification.

Furthermore, by providing a bearing level adjusting function for the pulley-supporting member used for transportation, it is possible to prevent contact damage to the cable and to ensure and facilitate the fixing work performed after transportation. Is played.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a construction method of a structure according to a first embodiment of the present invention.

FIG. 2 is a schematic explanatory view of a construction method of a structure according to a second embodiment of the present invention.

FIG. 3 is a perspective view illustrating a mode of transporting a structural member in the method of erection of a structure according to the first embodiment of the present invention.

FIG. 4 is a front view corresponding to FIG. 3, in which (a) shows a transport state and (b) shows an attached state.

FIG. 5 is a schematic explanatory view of a method for erection of a structure according to a third embodiment of the present invention, and sequentially shows five steps from installation of an anchor (a) to transfer of a structural member to a cable (e).

FIG. 6 is a perspective view illustrating a mode of transporting a structural member in a method of erection of a structure according to a third embodiment of the present invention.

7 is a two-sided view corresponding to FIG. 6, (a) is a front view,
(B) is a right side view.

FIG. 8 is a perspective view illustrating a mode of transferring a structural member to a cable in a method of erection of a structure according to a third embodiment of the present invention.

9 is a two-sided view corresponding to FIG. 8, (a) is a front view,
(B) is a right side view.

FIG. 10 is a schematic explanatory view of a method for erection of a structure according to a fourth embodiment of the present invention, in which three steps, from parallel wiring (a) to transport of structural members (a) to floor slab mounting (c), are sequentially performed. Shown in

FIG. 11 is a schematic explanatory view of a first example in a conventional structure erection method.

FIG. 12 is a schematic explanatory view of a second example of the conventional structure erection method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Anchor block 2 ... Cable 3 ... Structural member 3A ... Horizontal girder 3B ... Vertical girder 3C ...
Linked structure 3D ... Floor slab 3U ... Unit structure 4 ...
Temporary rope 5 ... Support member with pulley 6 ... Transport rope 7 ... Mounting bracket 8 ... Pulley 9 ... Winch 10 ... Small wrecker 11 ... Frame 12 ... Lower lid 13 ...
Height adjustment bolts 14: Captive pins 15 ... Nuts 16 ...
anchor

Claims (8)

[Claims] 1. When erection of a structure constituted by supporting a structural member including a horizontal girder and a floor slab by a cable stretched between anchor blocks, the cable is maintained at a predetermined interval and is fixed between the anchor blocks. After the cable is used as a rail, the structural member is slid from one anchor block side to the other anchor block side via a pulley-supporting member slidably attached to the cable. Transporting, and then fixing the structural member to a cable with a mounting bracket. 2. The structural member that transports a cable by using it as a rail is a unit structure formed as a single body or a floor assembly, and is repeatedly moved from one anchor block side to the other anchor block side by a transport rope. 2. The construction method according to claim 1, wherein the structures are sequentially conveyed by being retracted. 3. The connecting member, wherein the structural member for transporting the cable by using the cable as a rail is formed by connecting unit structures formed individually or in a floor assembly on one anchor block side sequentially. The construction method of a structure according to claim 1, wherein the structure is conveyed in a lump by being drawn in from the anchor block side to the other anchor block side by a conveying rope. 4. The structure according to claim 1, wherein the support member with a pulley has a support level adjusting function capable of adjusting a height support level of the supported structural member with respect to the pulley. Construction method. 5. When erection of a structure constituted by supporting a structural member including a horizontal girder and a floor slab by a cable stretched between anchor blocks, the cable having a predetermined distance and the inside of the cable or A temporary rope having a width center line aligned with the outside is stretched between the anchor blocks to tension the temporary rope, and then the temporary rope is used as a rail to slide the structural member onto the temporary rope. Sliding from one anchor block side to the other anchor block side via a freely mounted pulley-supporting member, transporting the same, and then introducing a predetermined tension to the cable, and then transferring the structural member to the cable. A construction method of a structure characterized by the following. 6. The structural member for transporting by using a temporary rope as a rail is a unit structure formed as a single body or a floor assembly, and is transported from one anchor block side to the other anchor block side by a transport rope. The construction method of a structure according to claim 5, wherein the structure is conveyed sequentially by being repeatedly retracted. 7. The connecting structure, wherein the structural member for transporting by using the temporary rope as a rail is formed by sequentially connecting unit structures formed alone or in a floor assembly on one anchor block side, The construction method of a structure according to claim 5, wherein the structure is conveyed collectively by being drawn in from one anchor block side to the other anchor block side by a conveyance rope. 8. When erection of a structure constituted by supporting a structural member including a cross beam and a floor slab by a cable stretched between anchor blocks, prior to the stretching of the cable, the structure is moved relative to the stretching position. After stretching a temporary rope between the anchor blocks so that the width center line fits inside or outside, and tightening, the cable to be stretched from one anchor block side to the other anchor block side Along with fixing the structural member, the structural member is further slidably supported on the temporary rope via a pulley-supporting member, and the temporary rope is used as a rail to stretch the cable and transport the structural member. And then, after applying a predetermined tension to the cable,
A method for erection of a structure, wherein a temporary rope is detached from a structural member, pulled in, and removed.