JPS63160992A - Method of erection construction of different length beam between same erection diameter and device thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for constructing bridge girders, and relates to a method for constructing girders of bridges, and the present invention relates to a method for constructing girders of bridges, and relates to a method for safely and efficiently installing girders of different lengths in a span in which the piers are in the shape of an "eight." The present invention relates to construction methods for constructing bridges and prayer equipment used directly in the construction methods.

[Conventional technology]

Generally, when constructing a bridge, precast girders manufactured at a girder factory are transported in the longitudinal direction of the bridge, and then moved laterally by a gantry crane mounted on both piers to be erected. A bridge girder construction method is being used in which the bridge girder is installed at the φ position.

In the Tachibana curve, the adjacent piers form a so-called ``dachi'' (shaped like an ``eight''), and the girder lengths on the inside and outside of the curve, such as the upper and lower bridges, are different.

Therefore, if precast girders are to be erected in such a span, α) For example, should the upper and lower girders with different girder lengths be erected as separate work?

■ Each time a gantry crane is used to move a short distance laterally, the girder is unloaded onto the pier and temporarily placed there, and the gantry crane moves laterally while repeating the departure and rehanging (reshuffling of the girder). A method was taken.

The former method requires twice the effort to work on the same span, and the latter method requires a significant amount of effort to rehang.
It is inevitable that the ink dot will deviate from the center of suspension of the gantry crane, so if the allowable range is incorrect, it may lead to an accident.

[Problem that the invention seeks to solve]

The present invention improves the efficiency of such conventional inefficient work, eliminates potentially unsafe work, and provides a construction method for constructing girders of different lengths in the same span in a short construction period, at low cost, and safely. The purpose is to provide such equipment.

[Means for solving problems]

In the method of the present invention, when a plurality of girders of different lengths are erected in the same span, the girder suspension point is continuously moved in the length direction of the girder, and the girder is attached to a gate-shaped girder mounted on a pier. This construction method is characterized by horizontal movement using a crane.

A suitable device for realizing the above method has a joint that connects the girder with a Gebinde steel rod, has a roller guide rail built inside, and rolls the rollers rolling along the guide rail in the longitudinal direction of the girder. This is a precipitation apparatus characterized by comprising a movable crane hanging tool and a power device for moving the crane hanging tool.

[Effect]

The method of the present invention moves the ink points of the digits in the direction of the digit length to J! l! Since the girder is moved laterally while being continuously moved, the following favorable effects are produced.

a) Since the ink point is always kept at the center of suspension of the gate type crane and the lead is moved laterally, there is no need to replace the girder at all, resulting in a high percentage of work.

b) Gate-type cranes are extremely safe because they do not tilt out and are not subjected to eccentric loads.

C) Manpower is significantly reduced.

d) Since there is no need for separate construction for each upper and lower line,
It can be constructed in a short construction period and is highly economical.

Next, if the device of the present invention is used, all of the above functions can be achieved, and the rough movement of ink points can be easily, safely, and by remote control.
It can be done reliably.

〔Example〕

First, a precipitation apparatus of the present invention that can suitably carry out the method of the present invention will be described with reference to the drawings.

FIG. 1 is a three-sided view of the embodiment, in which (a) is a plan view and (a) is a plan view;
b) is an elevational view, and (C) is a sectional view taken along the line A-A. Second
The figure is an explanatory diagram showing the state in which this device is attached to a girder.

The precipitation device 1 has a connecting portion 2 connected to the girder almost in the center thereof.
It is placed on the pillow material 21 placed on the girder 20, and is rigidly connected to the girder 20 with Gebinde steel rods 22 as shown in FIG. The precipitation apparatus 1 has a built-in guide rail 8, and is equipped with a crane hoist 5 via rollers 7 that roll along the guide rail 8. The crane hanging tool 5 is equipped with a hanging hand 6 at the upper end, and a rolling roller 7 is attached to the lower end. lift. The crane hanging tool 5 itself can be moved back and forth along this guide rail 8 by rollers 7.

A moving screw device is attached to the crane hanging tool 5, and a motor 9 built in the precipitation device 1 rotates the screw 10- in forward and reverse directions to move the crane hanging tool 5 back and forth in the longitudinal direction of the girder 20.

The motor i is driven by remote control, and can appropriately move the crane hanging tool 5 in accordance with the movement of the gantry crane (not shown), thereby keeping the ink point of the gantry crane always at the center of the suspension.

For safety, stroke limit switches 11 and 12 are provided at both extreme positions of movement of the crane hanging tool 5 in the deposition device, and a buzzer and the like are attached.

By the method of the present invention using the apparatus shown in FIG.
A 0m curved road bridge was constructed. It was necessary to erect I-shaped prestressed concrete girders with a difference of 1.25 m in length between the top and bottom lines between the drumstick-shaped piers with a total width of 26 m and an average span of 36 m.

The method of the present invention was adopted in place of the conventional method of constructing separate girders for the upper and lower lines, or the method of temporarily placing girders on piers and moving them laterally while changing the suspension.

A temporary girder was installed in the center of the pier, and a circular crane with a hanging load of 52T was installed on each pier. The depositing device 1 shown in Fig. 1 is attached to each end of the I-shaped girder that has been transported in the longitudinal direction on the temporary girder in the center of the pier as shown in Fig. 2. Fig. 2 shows only one end of the girder. ), hoist the engineering shape with a gantry crane, drive the take-off movement motor 9 by remote control to maintain the ink point position at the center of suspension of the circular crane, move the I-shape laterally, and lift the girder. The construction work was carried out.

It was a great success in terms of labor saving, safety, and short construction period.

〔Effect of the invention〕

By the method of the present invention, when precast girders are to be erected between piers and girders of different lengths are to be erected in the same span, construction can be performed in a labor-saving, safe and short construction period, contributing to bridge construction work. There is a huge amount to do.

[Brief explanation of the drawing]

FIG. 1 is a three-dimensional drawing of an embodiment of the device of the present invention, and FIG. 2 is an explanatory diagram showing the state in which this device is attached to a girder. l...Precipitating device 2...Joining part 5...Crane hanging tool 6...Hanger 7...Support roller 8...Guide rail 9...Motor 10...Screw 11.12 ... Limit switch 20 ... Girder 21 ... Pillow material 22 ... Gebinde steel bar

Claims (1)

[Claims] 1. When constructing a plurality of girders of different lengths in the same construction span, the girder is mounted on a pier while continuously moving the girder suspension point in the length direction of the girder. A construction method for constructing girders of different lengths over the same span, characterized by horizontal movement using a portal crane. 2. It has a joint that connects the girder with a Gebinde steel rod, has a built-in guide rail, and is equipped with a crane hoist that can be moved in the longitudinal direction of the girder via rollers that roll along the guide rail. A girder hanging device characterized by being equipped with a power device for moving tools.