JP3038154B2 - Overhang work equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an overhang work apparatus used when overhanging a bridge having a variable width.

[0002]

2. Description of the Related Art A cantilevered erection work device is used to divide a bridge body from above a pier into 2 to 4 m in a bridge axis direction from a pier because of a feature that the bridge is not restricted by a long span span or a space under a girder. The method of erection of a bridge constructed by alternately extending right and left is widely adopted.

In this overhanging work apparatus, a rail that can be relocated in the bridge axis direction is temporarily fixed on an existing bridge body block, and the work apparatus is mounted on the rail so as to be able to move forward and backward. The block is constructed by suspending and supporting a frame or a scaffold, assembling a reinforcing bar or the like, and pouring concrete. Then, in preparation for the construction of the next block, the temporary fixing of the rail is released, the rail is advanced to the next block position and temporarily fixed again, and the erection work device is advanced to the next block construction position. This is a method of repeating the above steps and overhanging the bridge body one after another.

In recent years, however, the structure of the bridge has become more complicated. Particularly in highway bridges and the like, not only bridges having the same width but also lanes branching from the middle of the bridge and the width of the bridge changes in size. An installation work device capable of coping with such circumstances has also been proposed.

As an example, there are Japanese Patent Publication No. 3-74722 and Japanese Patent Laid-Open Publication No. 1-187205. The former describes a scalable configuration, and the latter describes a specific use of the former.

In this prior art, a substantially parallelogram-shaped main structure (main frame) is interposed between two long beams orthogonally to two long beams installed in the width direction, and the upper and lower sides of the horizontal beams are arranged. An auxiliary support that can be extended and retracted is provided between them, and the erection work device is configured to be movable in the width direction of the main structure by extending the auxiliary support, and at a bridge installation point where the width changes, another rail is used to change the width Is to be newly established in correspondence with the web.

[0007]

In the overhang construction method, the length of one construction unit of the bridge body is about 2 to 4 m in the bridge axis direction.
Changes in the width of a bridge are rarely abruptly expanded and contracted from a certain point, but gradually begin to expand and contract.
It is about.

The present invention pays attention to this point, and provides a bridging work device which can respond to a change in the width of a bridge with a relatively simple device without requiring a new long beam or an auxiliary rail.

[0009]

An overhanging work apparatus comprises a plurality of substantially parallelogram-shaped main structures installed in parallel with a bridge axis, and a plurality of main structures perpendicular to the main structure before and after an upper horizontal side of the main structure. Two upper cross beams, a plurality of suspension members suspended from the cross beams, a plurality of vertical and horizontal beams supported by the suspension members, formwork supports and work scaffolds, and front and rear of a lower horizontal portion of the main structure. , A wheel for moving the main structure forward and backward, and a rail temporarily fixed on a bridge on which the wheel runs.

According to the present invention, there is provided an overhanging work apparatus having the above-described structure, wherein an extendable support leg is provided at an overhanging portion of the main structure, and the upper portion is provided through means for enabling the main structure to slide in the longitudinal direction of the cross beam. By connecting the cross beam and the main structure, and interposing a movable platform that can move the rail in the orthogonal direction between the lower surface of the rail and the bridge body, the main structure and the rail can be moved in the direction perpendicular to the bridge axis. It was done.

According to the present invention, a short support leg which can be extended and contracted is provided at an intermediate point of the overhang of the main structure of a substantially parallelogram of the overhanging work device, and the support leg is extended and brought into contact with the upper surface of the rail. Subject to front overhang load. Then, the upper and lower upper cross beams and the main structure can be slid in the cross beam direction, for example, a sliding plate on which a fluororesin sheet or the like having a low friction property is stuck and joined, and at the same time, the main structure is Movement that can move the rail in the orthogonal direction between the lower surface of the rail near the bisecting point of the center of gravity of the load, such as the acting own weight, the cross beam, the suspended form support, the work table, etc. Install a stand. This moving table is also sandwiched with a fluororesin sheet or a mirror-finished steel sheet having low friction properties, and is slid with a jack or the like.
The movement of the main structure and the rail in the direction perpendicular to the bridge axis causes the main structure sliding means and the rail moving base to cooperate to move one main structure in parallel to the other main structure.

The bisection point of the center of gravity means two points that are separated in the longitudinal direction of the rail with the center of gravity of the vertical load acting on the rail interposed therebetween and bear 1/2 of the vertical load to each other.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a side view of an overhanging work apparatus 1 according to an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a plan view.

FIG. 1 is a cross-sectional view of a bridge body 10 from a capital 100 of a pier.
1 is a side view of an overhanging work apparatus 1 that alternately overhangs 1, 102, and 103 to the left and right, and shows a stage where the construction of a bridge body 103 is completed.

The overhanging work apparatus 1 is provided with a plurality of rows of substantially parallelogram-shaped main structures 2 installed in parallel with the bridge axis. In this example, as shown in FIG. 2, there are main structures 2, 2, and 2 in three rows A, B, and C. Each main structure 2 has a cross beam 3 mounted near the center and on the tip side. From this cross beam 3, the work scaffold 22, the form support 23, etc.
4 and the bridge body 103 was constructed using these. The rail 11 is supported by a plurality of fixing stands 16 and is fixed to the bridge body by a plurality of rail anchors 8, and the telescopic front support leg 15 is in a retracted state. The support legs 15 are used when the main structure moves laterally, and are provided in the main structures in the rows B and C in the examples of FIGS.

The width can be enlarged or reduced at the same time in the left and right directions, or when the position is shifted to start the expansion or contraction, or when only one of the right and left sides changes. There is a large change and the bridge is separated. 2 and 3 show the construction progress direction arrow 1.
FIG. 20 (FIG. 3) shows an example in which the bridge body is reduced. Of the three main structures, the main structure 2 in row A proceeds as it is and the other main structures B
The two main structures 2 and 2 in row C and row C are offset in the direction of the arrows 13 and 14 by one construction unit change, and the standard bridge 103 is sequentially reduced in width as 105, 107 and 109, and the center of the web is changed. The case where the position of a line changes like 121,122,123 is illustrated. The movement amount of the arrows 13 and 14 is
Naturally, the outer arrow 13 is larger.

In the embodiment, a two-chamber box girder (three webs) section is shown.
Web spacing is 4.7m + 4.7m to 3.7m + 3.
It is a bridge with a bridge that can be reduced up to 2.0m to 7m. The overhanging work apparatus 1 used in this example has a three-row main structure. As shown in FIG. 3, the main structure 2 in the A row proceeds straight as it is, and the This is the case when the column is reduced to one side. Therefore, the main structure 2 in column A is set as a reference main structure (fixed main structure), and the intermediate main structure (column B) and the right main structure (column C).
Can be moved.

Referring to FIGS. 4 to 9, an example will be described in which an overhanging work apparatus 1 of the embodiment is used to construct a bridge body having a reduced width. The work procedure is as follows.

(A) Preparation for Movement In this example, the width of the bridge body is reduced. FIG. 4 is a side view of the main structure 2 in the row B or C, and the bridge body 103 at the front portion where the width starts to be reduced. Of the main structure 2 in the rows B and C has been prepared to correspond to the next bridge whose width is to be reduced. The rail anchor 8 fixing the rail 11 to the bridge body is released, the rail 11 is advanced to the next construction position, and the telescopic front support leg 15 stored in the overhanging beam of the main structure 2 is lowered. The telescopic jack is extended and brought into contact with the rail 11 to support the front weight applied to the main structure on the rail. The rail 11 is transferred to the movable base 12 at two positions where the load including its own weight acting on the main structure is approximately bisected, and at the same time, the main structure 2 is tightened and integrated with the rail 11 by the connection anchor 7. FIG. 5 (a) shows row B or C
FIG. 5B is a side view of the main structure of the row, and FIG. As shown in FIG. 5 (b), the rail 11 under the main structure 2 in row A
Is also advanced to the next construction position, received by the fixed gantry 16, and tied with the rail 11 by the front and rear connection anchors 7, 7 to be integrated. Then, for safety, all the main structures in the rows A, B, and C are fixed to the existing bridge body by the rail anchors 8, and the preparation for the movement is completed (FIGS. 5A and 5B).

(A) Movement of main structure The main structure is moved from main structure 2 in column C. First, the traversing sliding device 4 interposed at the joint between the main structure 2 and the cross beam 3 in FIG. 6 will be described. FIG. 6A is a side view of the cross beam 3, and FIG.
FIG. 6B is a view taken in the direction of arrow D in FIG. 6A, and FIG.
(B) It is an arrow E view of a figure. In the embodiment, the cross beam 3 and the main structure 2 are used.
And a traversing sliding device 4 is interposed therebetween. The traversing sliding device 4 has a sliding plate 4a on its lower surface, and has a built-in jack 4b for laterally moving the main structure 2, and the main structure 2 is in contact with the lower surface of the sliding plate 4a.

Next, FIG. 7 shows a movable table 12 interposed below the rail 11, FIG. 7 (a) is a cross-sectional view of the movable table 12, and FIG. 7 (b) is a view of FIG. 7 (a). FIG. The movable platform 12 is placed on the existing bridge 103, and the jack 12b
And a sliding plate 12a is provided between itself and the rail 11 to move the rail 11 in the direction of arrow 12c.

FIG. 8 shows a detailed front view of the main structure in row C.
The lateral movement of the main structure 2 will be described with reference to FIGS. The rail anchors 8 of the C-row main structure 2 shown in FIG. 5A are released, and as shown in FIG. 8, the suspending members 21 suspended from the cross beams 3 are attached to the temporary hanging members 4 c of the cross beam sliding device 4. Replacement, the ship jack 25 on the receiving beam 26 is loosened to release the load acting on the lower cross beam 24 from the load burden on the C-row main structure 2.
In other words, the load temporarily applied to the main structure in row C is applied to the main structures in row A and row B.

The fixing device 5 of the traversing sliding device 4 of the main structure 2 in row C is released (FIG. 6), and the moving table 12 below the rail 11 in FIG.
Is slightly advanced, the jack 12b of the movable base 12 and the jack 4b of the traversing sliding device 4 are operated to move the main structure 2 in the C row in parallel to the main structure 2 in the B row. In this example, it comes to the inside in the bridge body width direction. Traversing sliding device 4
, A sliding plate 4a made of a fluororesin is sandwiched between the sliding surfaces of the movable table 12 and the sliding plate 4a.

When the main structure 2 in row C is moved laterally by a predetermined change amount, the rail anchor 8 of the main structure 2 in row C is fixed again, the fixing device 5 of the traversing sliding device 4 is set, and 21 is changed from the temporary suspension fitting 4c to the cross beam 3, and the ship jack 2 is replaced.
5, the load of the lower cross beam 24 is applied to the main structure 2 in row C.

The same operation is performed on the main structure 2 in row B.
When the movement of the main structures 2 and 2 in the rows B and C is completed, the front support legs 15 in the rows B and C are stored in the main premises, and the connection anchors 7 of the main structures 2, 2, and 2 in the rows A, B, and C are arranged. To release. Then, FIG.
As shown in the figure above, the rail anchor is set in the same way as the operation of the conventional overhanging work equipment, the overhanging work equipment is advanced, the rebar and formwork are assembled, concrete is poured, and the bridge is constructed. I do.

In this example, the amount of change in the width at the time of progress of one construction unit (one block) is 20 cm, and the total width is 2.0 cm.
It took 10 construction units to change the width of m. Further, in this example, an example of a change in which the width is reduced has been described, but a change in which the width is expanded can be similarly handled. Further, even when the change in the enlargement / reduction occurs in the width direction in the width direction, it can be dealt with by setting the reference (fixed) main structure at the position of the main structure in the B row in the above embodiment. Further, the cross section of the bridge body is not limited to the two-room box girder of the present embodiment, and the same procedure can be applied to a one-room box girder or a three-room box girder. However, in the case of a single room box girder, a temporary support column that temporarily bears the load of the moving main structure is used. Further, in this example, the telescopic front leg 15 was also accommodated in the main premises because there was a space that could be stored inside the main premises. However, as shown in FIG. Needless to say, a storage method such as storage may be used.

[0027]

According to the apparatus of the present invention, a short support leg which can be extended and contracted is provided at the midpoint of the main structure of the erection work device at the front end of the main structure, and the connecting structure between the horizontal beam and the main structure is used as the horizontal beam. At the same time the rail on which the main structure is mounted is received from the bridge near the center of gravity of the erection work device by a moving platform, and cooperates with the moving means at the top of the main structure Since the main structure was able to move horizontally in parallel with the reference main structure, it became possible to easily cope with changes in the width of the bridge body.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment.

FIG. 2 is a front view of the embodiment.

FIG. 3 is a plan view of the embodiment.

FIG. 4 is a width change work process diagram.

FIG. 5 is a view showing a width changing work process.

FIG. 6 is a detailed view of a connecting portion between a main structure and a cross beam.

FIG. 7 is a detailed view of a carriage under rail;

FIG. 8 is an explanatory view of replacement of a hanging member.

FIG. 9 is a diagram showing a width changing work process.

FIG. 10 is another embodiment.

[Explanation of symbols]

 Reference Signs List 1 overhanging work apparatus 2 main structure 3 cross beam 4 traversing sliding device 4a sliding plate 4b jack 4c temporary suspension fitting 5 fixing device 7 connecting anchor 8 rail anchor 11 rail 12 moving stand 12a sliding plate 12b jack 12c, 13, 14 Arrow 15 Support leg 16 Fixing stand 21 Hanging material 22 Scaffolding 23 Form support 24 Lower cross beam 25 Ship jack 26 Receiving beam 100 Bridge pier column head 101, 102, 103, 105, 107 Bridge body

Claims (1)

(57) [Claims] 1. An overhanging work apparatus having a plurality of main structures parallel to a bridge axis, a plurality of upper cross beams orthogonal to the main shaft, forward and backward wheels, and running rails. The upper cross beam and the main structure are connected to each other through a means for enabling the main structure to slide in the cross beam longitudinal direction, and the rail is interposed between the lower surface of the rail and the bridge body in an orthogonal direction. An overhanging work device characterized by having a movable table interposed therebetween.