JPH04166562A - Construction of pc building by portal crane - Google Patents

Abstract

PURPOSE:To efficiently carry out construction works even in a narrow site and reduce costs, by using a transferable portal crane on rails laid along the building site at both limit sides of the building to carry out the construction works from the foundation work to the removal of the rails. CONSTITUTION:A portal crane composed of four posts 1, saddles 2, main girders 3, traveling wheels 4, a driving mortor 6, connection beams 10, hoist rails 11, a hoist 12, and a working base 14 is transferably installed on the rails 5 laid along the building limit A. And the foundation, erection work of PC floor slab on the first floor, erection work of PC wall plates on the first floor, erection works of PC floor slabs and wall plates of the upper floors, waterproof works, equipment installation works, and finishing works of the interial and exterial works are carried out in this order by use of this crane. And fitting works of PC auxiliary plates such as handrails on the working base 14 and the exterial works are carried out to erect the PC building. And after scaffolds members or the like are taken out, the crane and rails 5 are removed at last.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of constructing a PC (precast concrete) building using a circular crane.

[Prior Art 1] In general, construction work for buildings consists mostly of transportation work in which building materials are moved vertically and horizontally.

In particular, for PC buildings, how efficiently the PC board transportation and erection work is carried out will determine how quickly the construction period and the amount of equipment required will be reduced.

By the way, mobile cranes such as crawler cranes and truck cranes have been used in conventional construction work for PCQ structures.

However, with this type of mobile crane, a site must be secured next to the building for the crane to run, and there are restrictions on site conditions.

When it was not possible to secure a running path for the crane, the building was divided into shorter spans and construction work was carried out sequentially for each of these divided spans, or a stationary crane such as a tower crane or jib crane was used.

[Problem M that the invention seeks to solve] However, when constructing a PC building using the conventional stationary crane described above, not only is it difficult to assemble and dismantle the crane, increasing costs, but also the crane cannot reach the long building, making the work difficult. The problem was that it was not possible.

In addition, split construction work using a mobile crane not only lengthens the construction period, but also requires a special structure for the PC board, especially the 71421 part, and poses problems such as placing an extra burden on the foundation. there were.

The present invention was made in order to solve the above-mentioned conventional problems, and its purpose is to be able to significantly shorten the construction period and to be able to perform construction work efficiently even on a narrow site. PC using gate type crane! It provides a way to build things.

[! Means for solving problems 1 The method for constructing PCT objects using a gantry crane according to the present invention involves laying rails on both sides of the construction site of a building and installing the gantry crane in a movable manner. The formwork and reinforcing bars for the reinforced concrete foundation were transported to a predetermined position and foundation work was carried out. Next, the first floor PC floorboards were transported to a predetermined position by the crane and erection work was carried out. PC on the floor! ! ! The boards are transported to a predetermined position and erection work is carried out, and if necessary, the above-mentioned crane is used to transport the PC floorboards and PC wall boards on the upper floor and the erection work is carried out repeatedly, and during each of the above works, the tilted concrete is removed. In addition to transporting interior and exterior materials and various equipment,
Using the workbench installed on the pillar of the above-mentioned portal crane, we erected attached PC boards such as handrails and worked on the exterior of the building, and also carried out dismantled scaffolding members and surplus materials using the crane. Finally, the crane and rails are removed.

[Embodiment 1] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

Figures 1 and 2 show the front and side views of a gate-type crane installed at a construction site. In this example, there are two pillars, two on the left and right, arranged in parallel at a predetermined distance. They are erected, and their lower #1 portion is integrally assembled with a saddle 2.

The upper jlI portions of the two left and right pillars 1 are integrally connected by a main girder 3°3.

Traveling wheels 4, 4 are rotatably arranged under both ends of the saddle 2, and the crane is moved while being driven on a traveling rail 5.

The running rail 5 is laid along the construction site on both sides of the construction limit A of the building. In addition, if the building is long, it is preferable to lay the running rail 5 in the longitudinal direction, and it is also preferable to lay the running rail 5 in the direction from the public road side to the back, but it is not limited to this. The running rails 5 are laid in a direction that makes it easy to carry in and transport materials according to the site and the shape of the building.

6 is a drive motor for rotationally driving the running wheels 4; 7 is a power cable 8 wired along the running rail 5;
This is a power collection device that winds up and unwinds the wind as the crane moves. A crane anchor 9 is used to prevent the crane from escaping, and clamps the traveling rail 5 to fix the crane to the traveling rail.

Several connecting beams 10 are attached in parallel above the two main girders 3, 3, and extend outward from the pedestal 1. The main girder 3 is located below both ends of the connecting beam 10.
A hoist rail 11 is attached in parallel with.

A hoist 12 is movably provided on each of the hoist rails 11. 13 is a power cable.

The hoist 12 can be operated wirelessly, but it may also be operated by lowering an operating cord from the hoist 12.

Workbenches 14 are provided between the left and right pillars 1, 1, and the number and position of the workbenches 14 are arranged according to each floor of the building. Incidentally, it is preferable to provide a ladder or a simple lift (not shown) on the pillar 1 to make it easier for the worker to move up and down.

15 is a running stopper provided at the end of the running rail 5.

Next, a method for constructing a PC building using the above-described portal crane will be described in detail.

1) Foundation work First, the formwork for the foundation is brought in by crane and transported to the designated setting position, and the formwork work is carried out.Then, the reinforcing bars for the foundation are brought in and the reinforcement is arranged, and the reinforcing bars for the joints are placed in the designated position. After setting in the above position, pour concrete into the above formwork. This concrete placement can also be performed by suspending a concrete packet from the hook of the hoist 12.

In addition, in soft ground, PC piles, etc. should be driven into the ground prior to foundation work, and then the crane should be installed.

2) When the foundation work beyond the construction of the PC floorboards on the first floor is completed, as shown in Fig. 3, the PC floorboards 16 are carried to a predetermined position by a crane.
Assemble the foundation and mutual PC floorboards 16. At this time, after laying mortar on the top of the foundation,
Set 6. In addition, the Indian reinforcing bars of the foundation, each PC
The reinforcing bars of the floor plate 16 are connected to each other by arc welding, and their tied portions are filled with Indian mortar to integrate them.

3) Erecting the PC wall boards on the first floor Next, as shown in FIG. 4, the PC wall boards 17 were brought in by a crane and assembled in a predetermined position.

The reinforcing bars of adjacent PC wall plates 17 are tied together by arc welding, and the upper and lower PC51 plates 17 are tied together with sleeves, and their tied parts are filled with noraint mortar to integrate them. 64) Upper floor Construction of PC floorboards and PC wallboards Next, erect the PC floorboards on the second floor, then erect the PC wallboards on the second floor, and in the same way, install the PC floorboards and PC walls of the specified number of floors. The boards will be erected in sequence.

5) Waterproofing, equipment, and interior/exterior finishing work During or after the construction of the above-mentioned structure is completed, equipment materials for each floor will be brought in by crane and equipment work will be carried out.

In addition, as shown in Figure #5, a workbench 14 provided on the pillar 1
Use this to install PC accessory boards such as handrails 18,
Exterior work and waterproofing work will be carried out.

Figure 6 is a process chart for a three-story PC building comparing the construction process using the method of the present invention and the construction process based on the division method in the United States. In contrast, the construction method of the present invention takes only 17 days, which is less than half the construction time.

[Effects of the invention] 1) Even buildings on the same site can be constructed without dividing them.

2) When constructing the foundation of a long, narrow building, materials such as reinforcing bars and formwork can be carried in without relying on human power.

3) By shifting the position of the crane hoist,
It will be possible to use a crane to work up to the edge of the site in the longitudinal direction.

4) By installing a workbench on the crane, it is possible to perform exterior finishing work without building scaffolding.

5) By attaching a beam to a crane, it is possible to transport rails divided into certain lengths to the edge of the site.

6) Gate type cranes do not have to worry about falling over and can secure a long working range.

[Brief explanation of drawings]

Figure 1 is a front view of the gantry crane used in the construction method of the present invention.
Figure 2 is a side view, Figure 3 is a construction drawing showing how to erect the PC floorboards on the 1st floor, Figure 4 is a construction diagram showing how to erect the PC wall boards on the 1st floor,
FIG. 5 is a diagram of how to erect PC exterior wall panels using a workbench, and FIG. 6 is a comparison diagram of the work process of the method of the present invention and the American construction method. 1... Pillar, 2... Saddle, 3... Main girder, 4...
- Traveling wheel, 5... Traveling rail, 6... Drive motor, 7... Power collection device, 8... Power cable, 9...
Crane anchor, 10... Connection beam, 11... Hoist rail, 12... Hoist cart, 13... Power cord, 14... Workbench, 15... Travel stopper, 16...- PC floorboard, 17...PCT board, 18.
··handrail.

Claims (1)

[Claims] Rails are laid on both sides of the building construction site and a gate-type crane is installed in a movable manner. First, the formwork and reinforcing bars for the reinforced concrete foundation are transported to the specified position by the gate-type crane, and foundation work is carried out. Next, the foundation work is carried out. The crane removed the PC on the first floor.
The floorboards are transported to a predetermined position and erection work is carried out, then the PC wallboards on the first floor are transported to a predetermined position by the crane and erection work is carried out, and if necessary, the PC floorboards on the upper floor are removed by the crane. The transportation and erection work of PC wall boards and PC wall boards were carried out sequentially, and during each of the above works, joint concrete, interior and exterior materials, and various equipment were transported, and the work platform installed on the pillar of the gate type crane was used. The gate is characterized in that the construction work of attached PC boards such as handrails and the exterior work of the building are carried out, and then the dismantled scaffolding members and surplus materials are carried out using the crane, and finally the crane and the rails are removed. How to build a PC building using a type crane.