JP2802830B2 - Traveling method for long span beams - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a method for traveling a long span beam in which a plurality of long span beams which are erected are sequentially moved in a girder direction of a structure and connected.

[Conventional technology]

Conventionally, the first beam with a long span of about 50m is laid on the ground, assembled on a temporary gantry, and then pulled with a hydraulic jack, etc., while being supported by the supporting legs at both ends, in the direction of the girder of the structure. , The second beam is laid in the moved space, assembled on the temporary gantry, the first beam and the second beam are connected, and the connected first and second beams are joined together. Move one digit in the digit direction,
A method of assembling a target structure by repeating a traveling process of assembling, connecting, and moving the next beam in the moved space in the same manner as described above is known as a traveling method.

[Problems to be solved by the invention]

When trying to travel a beam having a long span exceeding 100 m by the conventional method, the support of the temporary gantry supporting the beam is removed and the beam is supported by the support legs at both ends, and the beam is long. Due to its heavy weight, it is bent by its own weight and drops by about 10cm to 25cm, so that the beam that has finished traveling and the next beam assembled on the temporary gantry are significantly different in height and cannot be connected. There was a point.

In addition, when the beam to be moved during traveling is removed by the temporary gantry, if the beam has a long span, the beam will be subjected to wind and vibration, causing torsion and unexpected reaction forces exceeding the design value, and work will continue. Then, there was a problem that was in a dangerous state.

The present invention solves these problems, and can reliably connect the advanced beam and the next beam even if the beam is a long span beam, and also has multiple fulcrums when jacking up and jacking down. It is an object of the present invention to provide a traveling method for a long span beam which can perform work without danger by centrally managing a reaction force.

[Means for solving the problem]

In order to solve the above problems, the present invention, after assembling a beam on a jack installed on a temporary gantry, jack down, pulling the beam forward in this state, moving the beam, After connecting the beam in this state and the next beam assembled on the jack installed on the temporary gantry at the position where the beam has been moved, the operation of jacking down these beams is repeated as many times as necessary. In the method of traveling a beam and the method, a pressure sensor is attached to a fulcrum installed at several places of each of four beams assembled on a jack of a temporary gantry, and a change in the pressure is represented as a change graph of a fulcrum reaction force in one place. Is displayed in a concentrated manner, and when the change in the fulcrum reaction force exceeds the danger caution value, a means for changing to a warning color or emitting a warning sound is taken.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

In order to construct a structure having a beam with a long span such that the distance between the beams exceeds 100 m, adopting the traveling method is advantageous in terms of safety and construction period.

In FIG. 1A, a ground beam member is assembled on a jack 3 installed on a temporary gantry 2 provided at several places, into a first beam 1 which is rectangular as viewed from the side, and this is attached to support legs 4 at both ends.
To support. 1 'is a connecting member of the beam 1.

The lower part of the support leg 4 is connected by a connecting member 5, and the roller 6 attached to the lower part of the support leg 4 is placed on the rail 7, and then, as shown in FIG. Is lowered (referred to as jack-down in this specification), the first beam 1 loses the support of the jack 3, so that
Due to its own weight, it descends from the chain line position to the solid line position as shown by the arrow.

In this state, as shown in FIG. C, the support leg 4 is pulled rightward by a hydraulic jack (not shown) or the like commonly used in the traveling method and moved one beam 1 to the right.

Next, as shown in Fig. D, the jack 3 on the temporary gantry 2 installed at the moving position is raised (in this specification, referred to as jack-up), and the height of the beam 1 is changed from the position of the chain line as indicated by the arrow. After making the solid line position at the same height as before the jack down, as shown in Fig. E, assemble the second beam 1a on the temporary gantry 2 in the empty space after moving the first beam 1, It is connected to the first beam 1 by a connecting member 1 '. When the connection is completed, the jacks 3 of all the temporary gantry 2 are jacked down as shown by arrows as shown in FIG. So that

Hereinafter, the construction of the desired structure is completed by repeating the operations shown in FIGS.

In the above-described work, when jack-down or jack-up is performed, an unexpected reaction force occurs when the balance of the fulcrum reaction force is disrupted due to a variation in wind or jack operation, and the work becomes dangerous, so the upper end of the temporary gantry 2 The pressure sensors 8 attached in the middle of the hydraulic tube branched from the hydraulic tube of the installed jack 3 are installed at eight places on the lower surface of the beam 1, and the amount of change in the hydraulic pressure from the pressure sensor 8 is A / D converted. Numerical values of the fulcrum reaction force at eight points are converted by the personal computer 10 via the unit 9 and are collectively displayed on the cathode ray tube (CRT) 11 as shown in FIG.

In FIG. 3, numerals 1 to 4, 5 to 8, 9 to 12, and 13 to 16 indicate that two fulcrums at symmetrical positions where the same reaction force is assumed among the fulcrums of the four rows of beams 1 are one. 8 fulcrum points to 4
The fulcrum of each point is shown and these reaction forces are divided into four rows of beams. The values in the upper column of the bar graph 12 in which the value of the fulcrum reaction force is expressed as a percentage of the danger value are the danger values in tons. , The horizontal dotted line in the column of the bar graph 12 below indicates the caution value, the numerical value in the lower column represents the actual load value in ton, and when the bar graph 12 exceeds the caution value, The color is changed to a warning color such as red, or a warning sound is emitted.

This makes it possible to collectively monitor the values of the fulcrum reaction forces at the eight fulcrums of the temporary gantry 2 of four rows of beams when the jack is lowered or jacked up. The down and the jack-up are stopped, and the jack-down and the jack-up are resumed when the value falls below the caution value, so that the work can be performed safely.

〔The invention's effect〕

Even if it is attempted to reduce the number of construction steps for large structures, it is possible to travel long and long span beams, which was impossible with the conventional traveling method, and the construction method for large structures can be shortened, and the traveling method Therefore, work at high places can be reduced and safety can be improved.

In addition, since the fulcrum reaction force of each beam can be centrally managed, the work can be performed while confirming the safety, so that the safety is improved. Further, since the reaction at the time of actual construction can be confirmed, a more accurate design can be performed.

[Brief description of the drawings]

1A to 1F are explanatory views of the traveling method viewed from the side, FIG. 2 is a front view of a state in which a beam is supported, and FIG. 3 is a CR.
FIG. 3 is a detailed view showing a display surface of T. 1 ... beam, 1a ... beam, 2 ... temporary gantry, 3 ... jack, 4 ... support leg, 8 ... pressure sensor.

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Takahiro Takemasa 8-21-1, Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store (56) References JP-A-2-91339 (JP, A) JP-A-63-47439 (JP, A) JP-A-59-68454 (JP, A) JP-A-2-8432 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04G 21 / 14 E04B 1/342

Claims (3)

(57) [Claims] 1. A beam (1) is assembled on a jack (3) installed on a temporary gantry (2) and supported by supporting legs (4), and then jack-down is performed. Is pulled forward, the moved beam (1) is jacked up, and the beam (1) in this state and the jack (3) installed on the temporary gantry (2) at the position where the beam (1) has moved. A method for traveling a long span beam in which the operation of jacking down these beams (1) and (1a) as required after connecting the next assembled beam (1a) is repeated. 2. A pressure sensor (8) is attached to a fulcrum set at each of several places of four beams (1) assembled on a jack (3) of a temporary gantry (2), and a change in the pressure is detected as a fulcrum. 2. The traveling method of a long span beam according to claim 1, wherein the change graph of the reaction force is displayed in one place. 3. The traveling method of a long span beam according to claim 2, wherein when the change of the fulcrum reaction force exceeds a danger caution value, the color changes to a warning color or a warning sound is issued.