KR950010520B1 - Fabrication method of precasted segment for bridge - Google Patents

Abstract

The method prepares a form stand for producing concrete segments for the whole length or a certain length portion of a bridge to fill concrete in segment forms first in the order of every other segment, for example if for 14 segments the first order of pouring may be that of the odd or even numbers under 14. After curing, the end panels of each of the concrete segments are removed to apply a releasing agent on the concret surface. The end part of the segments applied with the agent plays the role of end panel of the forms to be filled with concrete for the second order of every other segment. The segments thus produced match with each other well to produce no faulty gap between them in connection.

Description

Manufacturing method of precast segment for bridge

The accompanying drawings are exemplary reference drawings for carrying out the present invention.

1 is a partial perspective view of a bridge assembled from precast segments.

2 is a partial front view of a bridge assembled from precast segments.

3 is a cross-sectional view of a metrological mold length for producing precast segments.

4 is a reduced longitudinal section in the longitudinal direction of FIG.

5 is an explanatory diagram of a precast segment workflow.

6 is an explanatory diagram of a precast segment workflow.

7 is a perspective view of a precast segment made in accordance with the present invention.

The present invention is directed to a method for quickly and accurately manufacturing a number of precast segments that are connected to grand bridge construction.

The reason for adopting the precast segment connecting method in the construction of long bridges is that it can shorten the air and save construction cost.

By the way, the most important thing in the above-described method is the precise and rapid manufacturing of the precast segment (hereinafter referred to as "segment"). If the conventional manufacturing method is explained, the following problems can be seen.

In order to manufacture a segment that fits the size of the designed bridge, a precise design must be produced for each segmented segment (currently depending on foreign technicians). The formwork is precisely installed, while the assembled reinforcing bar is placed and the interior formwork completes the manufacturing mold. After placing the concrete dough in the finished manufacturing mold, if the concrete is partially cured, the formwork is removed and transported to the place where the curing facility is provided to cure with the required strength to complete one segment.

Looking at the problem of the conventional method of manufacturing a segment, since the segment is very large, only one segment can be manufactured in one manufacturing platform, so each time manufacturing, complicated computer calculation, surveying, inspection, and movement of the manufactured segment, etc. The situation is pointed out as one of the most inefficient problems such as the intricate work process of the process and the difficulty of the assembly work due to the poor precision of the joint surface when connecting each segment. One is that it takes too long to manufacture the entire segment for the construction of one bridge, and the other is the difficulty in joining such as gaps due to the inaccurate precision of the joint surface and the uneven portion that are joined during assembly of each segment. It is extreme.

The present invention, developed to solve such problems in the related art, installs a workbench corresponding to the entire length of a bridge or a predetermined length and installs one segment across one segment frame, for example, If the number is 14, install the mold from odd or even number first, then cast the concrete dough to make the segments one by one, and then apply the release agent to the preformed segment and form the preformed segment without a separate front and back mold. If only the formwork is installed and the concrete dough is poured, the segments that reach the bridge length are manufactured and cured.

Such a manufacturing method is a manufacturing method having various characteristics such as being able to manufacture a segment in the shortest period of time and at the same time, the joint surface and the uneven portion to be joined to each other are completely free from any difficulties in construction.

In order to implement the present invention, it is necessary to install a hydraulic device and an adjustment facility necessary for the preparation of a mold yard and formwork, installation of formwork, and demoulding.

As shown in FIG. 3, the mold sheet is dug to a depth where the upper surface of the segment Ps to be manufactured under the ground 11 is lowered to form the concrete layer 12. The concrete layer 12 forms a metrology below the ground 11, the length of which is composed of a length corresponding to the total length of the bridge or a predetermined length (for example, the length of FIG. 2). If the rail 14, 14 'can be easily installed on the side end of the curing tent 13, the manufacturing preparation of the segment is completed except for other crane facilities.

Next, the following manufacturing process will be described.

1st process

As shown in FIG. 5, from left to right, the assembled reinforcing bar is installed in the 7,5,3,1,2 ', 4', 6 'part forming one segment Ps, and the formwork is installed. Pour the dough.

2nd process

When the concrete poured in the first process is partially cured, the loose molds (forms installed on both sides in the length direction) are removed, and then the release agent is applied to the concrete surface of the manufactured segment, and 6,4,2,1 shown in FIG. Put the reinforcing bars in the ', 3', 5 ', and 7' part (between the segments obtained in the first step), move the internal formwork installed first and pour the concrete dough.

3rd process

When the concrete poured in the second process is partially cured, the mold is demolded inside and outside, and the curing tent is covered and cured until the required strength is reached.

Segments manufactured by the above process are sequentially separated one by one, moved to the field or yard in number order, and the process is repeated again to produce the segments.

Such a manufacturing method of the present invention is a method of manufacturing the segments between each segment by first manufacturing the segments first one by one in the first step and then applying only the release agent to the first manufactured segment instead of the mold. Even without precise calculation, design, and surveying work, the uneven part that is joined to the joint surface between each segment is precisely formed, which makes the assembling work convenient and the construction state is very clean and precise. It is effective to shorten the overall manufacturing period.

Claims (1)

As described above, the facility is provided with a rail-shaped mold length lower than the ground and a rail 14, 14 'which can install a curing tent on the side end of the concrete layer 12 formed therein. After installing the reinforcing bars and formwork for the parts No. 7,5,3,1,2 ', 4', 6 'shown in FIG. First, the segments made by pouring are prepared first, and then the mold form of the manufactured segment is removed, and then the release surface is applied to the concrete surface, and the number 6,4,2,1 ', 3', 5 shown in FIG. The method of manufacturing a precast segment for bridges, comprising inserting the reinforcing bar in the '7' part, and then moving the installed formwork and pouring concrete dough to produce a segment connected to the bridge.