KR20000024310A - Concrete slab construction method free of formwork using P.C and insitu concrete work on a bridge of girder and concrete slab - Google Patents

Abstract

PURPOSE: A construction method of concrete slab is provided to construct the concrete slab without a mold in the construction field of a bridge by constructing concrete and PC(Pre-cast Concrete) when constructing a girder plus concrete slab bridge. CONSTITUTION: A construction method of concrete slab contains the steps of: installing a girder, dividing a concrete slab as the thickness of the slab up and down, manufacturing the lower part with PC plank, carrying to a position of a bridge, installing on the girder, distributing bars, and installing the upper part of the slab. This method is safe and economic due to unnecessary molding work in a high place and prevents an eruption accident while installing concrete.

Description

Concrete slab construction method free of formwork using P.C and insitu concrete work on a bridge of girder and concrete slab}

For the construction of concrete slabs after the casting construction, the formwork should be installed at high altitudes, which is dangerous and inferior in construction, and may be collapsed during concrete placement, which is intended for safer and more economical construction.

-Technical field to which the invention belongs: construction / bridge construction

-Conventional technology: As shown in [Fig. 1], the conventional technology is to form a slab between two molds after a mold hypothesis, and then reinforce the slab concrete and place the slab concrete in a high-space space. It is dangerous, inefficient, and often causes collapses when placing concrete.

Alternatively, formwork is only possible after mold installation, which leads to longer air, and in winter, concrete work is not possible, resulting in greater air problems.

The slab concrete is divided into two thicknesses, and the lower part is easy to transport and install, and the factory is manufactured (PC Plank ①, ②) to be transported to the bridge position and installed between the molds. Construct with concrete.

o The inner part between the mold and the mold can be equipped with P.C Plank ① on both molds, but the outer cantilever can put P.C Plank ② on the mold only at one end, so a special hanging device (③) is needed.

This Hanging Device is a steel bar on the PC Plank (②) and the upper flange of the mold. ) Anchor Bracket that can be fixed is installed at the time of PC Plank (②) and mold manufacture respectively (refer to [3] (3) Force Balance)

o The P.C Plank is part of the bridge slab, so the shear connector is finally provided to give a sense of unity with the cast-in-place concrete. (See Figure 2 below)

o Once the P.C Plank installation is completed, reinforce the necessary reinforcement on it and complete the construction of the top cast concrete. P.C Plank replaces the formwork and simultaneously acts as a slab synthetically with cast-in-place concrete.

Since P.C Plank is factory manufactured, it can be produced regardless of the mold's hypothesis, and it can be produced regardless of climate even in winter so that it can shorten air, improve quality, safety construction and economic construction.

1: Cross section of a conventional mold + concrete slab bridge

2 is a cross-sectional view showing the P.C portion and cast-in-place concrete portion of the present invention

3: Hanging Device Arrangement Hanging P.C Plank (②) of Outer Cantilever

<Description of the symbols for the main parts of the drawings>

① P.C Plank to be placed between molds

② P.C Plank to be placed in the outer cantilever

③ Hanging Device which is a device for hanging the outer P.C Plank

Steel Anchor Bracket 1: Weld and attach steel rod anchor bracket to upper flange of mold so that outer PC Plank (②) can stay in place without falling. (At the time of mold making)

Steel Anchor Bracket 2: Anchor Bracket 1 is also required for PC Plank (②) itself to tie outer PC Plank (②) to the mold.

Steel rods: and It is a steel rod that connects the bolt.

-Center P.C Plank (①)

-Outer Cantilever P.C Plank (②)

-Hanging Device (③)

-Cast in place concrete (④)

-It is safe and economical because formwork is unnecessary at high altitude.

-There is no interference of predecessors in the process. In other words, P.C Plank can be manufactured separately from the mold hypothesis, which has the effect of shortening the air.

-It can prevent collapse accident when pouring concrete.

-Quality is excellent because it is manufactured by P.C Plank factory.

-It is possible to work regardless of winter season, so it shortens the air.

Claims (1)

Forming slab construction method using P.C and cast-in-place concrete in mold + concrete slab bridge