JPH0460060A - Building method for multi-story steel structure - Google Patents

Abstract

PURPOSE:To build multi-story steel stricture in a narrow plate by hinge- connecting the permanent steel frame of a high-story section with the base end faced upward to the permanent steel frame of a low-story section, arranging a pulley at the tip of a gantry, and rotating the permanent steel frame with a wire rope. CONSTITUTION:The permanent steel frame 1 of a low-story section is constructed on a foundation 2 completed with footing, the permanent steel frame 3 of a high-story section is assembled near it with a small crane, then the side end is hinge-connected 5 along the permanent steel frame 1 when the base end is faced upward. A pulley 10 is arranged at the tip of a temporary gantry 6 on the opposite side, and the permanent steel frame 3 is rotated via a winch 7 and a wire rope 8 with the hinge connection 5 serving as a pivot. The permanent steel frame 3 is received and damped by the rotation control of a hydraulic jack 12 and fixed on the permanent steel frame 1, and the temporary material is removed to complete a multi-story steel frame. It can be built in a narrow place.

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to a method for constructing a high-rise steel frame.

"Conventional technology" The conventional method of constructing high-rise steel frames is a frame structure.

Since weight is a major constraint on transportation, materials are transported to the site in single pieces and then assembled into three-dimensional frameworks using tower cranes or mobile cranes.

The cranes mentioned above are selected based on the weight and working radius of the single material, the height of the steel structure, etc.

``Problems to be solved by the invention'' However, in conventional construction, (1) most of the work is done at high places;
The work is difficult, has low work efficiency, is dangerous, and takes a long time, but the skills of jumpers who perform assembly work at heights are generally declining, and the temporary safety measures required for work at heights are decreasing. The problem is that it is becoming more difficult.

(2) If the structure becomes taller, a larger crane must be used, resulting in huge transportation and operating costs. It must be installed outside and requires considerable extra space for the crane installation and foundation work or soil curing for the crane equipment, but most sites are surrounded by buildings. Due to frequent occurrences, the delivery of materials,
It cannot be applied to sites where it is difficult to handle or secure scaffolding, or where there are obstacles that make it impossible to bring in a crane.

There are other problems.

The present invention enables construction to be carried out with only a small amount of work at height without requiring a large side crane. The aim is to provide a new method of steel frame construction that departs from the common sense of assembling materials.

"Means for Solving the Problems" In order to achieve the above object, the steel frame erection method of the present invention involves erecting the steel frames in the lower part of a high-rise steel frame using a small crane and low-rise scaffolding, while The steel frames of the high-rise section were assembled on the ground using a small crane, and the steel frames of the high-rise section were turned upside down and nestled against the steel frames of the low-rise section, and then the two side edges of the two adjacent steel frames to be joined were joined by hinges. At the same time, a gantry was installed protruding from the other end of the steel frame in the high-rise section, and the wire rope from a winch installed on the ground was passed over the upper end of the steel frame in the low-rise section, the gantry, and the upper end of the steel frame in the high-rise section, and then wound around it. The high-rise steel frame is pivoted about the hinge, and the lifting is stopped just before the center of gravity of the high-rise steel frame shifts in the lifting direction, and the steel frame is erected between the low-rise steel frame and the high-rise steel frame. The hydraulic jacks will be used to cushion the impact while anchoring the high-rise steel frame, which will then be fully connected and the high-rise steel frame will be erected.

"Operation" According to the construction method of the present invention configured as described above,
The permanent steel frame for the high-rise section will be constructed quickly and with high quality through ground assembly, and only requires a small crane to assemble it. Since the base end of the finished steel frame for the high-rise section is pinned, it can be easily erected with a winch, and the high-rise bridge can be erected all at once without the need for a crane.

Since the permanent steel frame of the high-rise section will be erected all at once,
There will be no work at heights, and there will only be work to connect the permanent steel beams at the top level of the lower floors.

"Example" To explain the example with reference to the drawings, in Figs. 1 and 2, the permanent steel frame 1 in the low-rise part of the high-rise steel frame has a relatively low-rise scaffold (not shown) and a small crane. Since it will be erected on the foundation 2 which has completed the foundation pouring,
It can be finished in the same way as Habochi-gumi. On the other hand, the permanent steel frame 3 in the high-rise section of the high-rise steel frame is assembled into the ground nearby. Since it is built on the ground, only a small crane is required.

The permanent steel frame 3 is placed upside down, that is, with its base end facing upward, and is placed close to the permanent steel frame 1, as shown in FIG. 2a. As a result, both steel frames 1 to be added,
3 are in contact with each other, and a hinge connection 5 is made between the side ends via a temporary bracket 4.

A gantry 6 is temporarily installed on the side of the permanent steel frame 3 opposite to the hinge connection 5. A wire rope 8 from a winch 7 installed on the ground on the opposite side of the hinge connection 5 of the permanent steel frame 1 is connected to a pulley 9 installed at the upper end of the permanent steel frame 1 on the opposite side to the hinge connection 5, and to the tip of the gantry 6. It is fastened 11 to the upper end of the main steel frame 3 via the provided pulley 10. By winding up the winch 7, the permanent steel frame 3 is rotated and pulled up about the hinge connection 5. This increase must not be final.

This is because the permanent steel frame 3, which is in an upright position with the hinge connection 5 as a fulcrum, loses control of the winch 7 when its center of gravity deviates from the fulcrum to the pulling side, and tilts upward. This is because it is accelerated by the tension of the rope 8 and collides with the main steel frame 1 with a large impact.

In order to avoid such a situation, the winch 7 stops the bow raising just before the above-mentioned deviation of the center of gravity occurs. While maintaining this state, a hydraulic jack 12 is erected between the permanent steel frame 1 and the main steel frame 3, with both ends anchored, and the hydraulic jack 12 is attached to the main steel frame 3.
Rearrange the rotation control.

However, the hydraulic jack 12 is
It absorbs and buffers the sudden tilting movement of the steel frame 1, and gently butts it against the main steel frame 1 and fixes it. Final connection of the fixing section and bracket 4, gun)! The high-rise steel frame will be completed after removing the temporary materials installed for lifting and rotating the J-6, hydraulic jack 12, etc.

"Effects of the Invention" Since the present invention is configured as described above, it produces the effects described below.

(1) Since high-rise steel frames can be erected without using large cranes, crane costs can be reduced.

(2) It can be erected in narrow spaces where obstacles or large cranes cannot enter or install.

(3) Safety is improved by reducing work at heights.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the method of the present invention, and FIGS. 2a and 2b are front and side views showing the details of the method of the present invention. 1...Permanent steel frame, 2...Foundation, 3...Permanent steel frame, 4...Bracket, 5...Hinge connection,
6... Gantry, 7... Winch, 8
... wire rope, 9 ... pulley, 10 ... pulley, 11 ... anchoring, 12 ... hydraulic jack. Plaque Zθ /ri2 snout

Claims (1)

[Claims] (1) Use a small crane to remove the lower steel frame of a high-rise steel frame.
The structure was erected using low-rise scaffolding, and the steel frames of the high-rise sections were erected on the ground using small cranes, and the steel frames of the high-rise sections were turned upside down and nestled against the steel frames of the low-rise sections, and then the steel frames of the high-rise sections were erected on the ground using small cranes. One side of the steel frame to be added is connected by a hinge, and a gantry is installed protruding from the other side of the steel frame in the high-rise section, and the wire rope of the winch installed on the ground is connected to the upper end of the steel frame in the low-rise section. The gantry is stretched around the upper end of the steel frame in the high-rise area, and the steel frame in the high-rise area is rotated and pulled up using the hinge, and the lifting is stopped just before the center of gravity of the steel frame in the high-rise area shifts in the lifting direction. Then, a hydraulic jack was installed between the steel frame of the low-rise section and the steel frame of the high-rise section, and the hydraulic jack cushioned the impact while anchoring the steel frame of the high-rise section.The final connection was made, and the high-rise steel frame was erected. A steel frame construction method for high-rise steel frames that is characterized by the following.