Research Trends and Results

Utilizing bridge 3D data over the course of design,
construction, and maintenance
Information Technology Division, Research Center for Advanced Information TechnologySenior Researcher AOYAMA Noriaki
Researcher Ph.D. (Information Science and Technology) TANIGUCI Hisatoshi
Head SHIGETAKA Koichi(Key word)CALS/EC, Bridge, 3D data
is a materialized figure of the control point.

1. Introduction
In the Ministry of Land, Infrastructure,
Transport and Tourism, we are considering
circulation and utilization of 3D data over thecourse of survey, design, construction, andmaintenance as the effort to CALS/EC.
In this paper we introduce the method of
circulating 3D data from design to construction
and maintenance, to streamline our operationsin the field of bridge construction.
2. Control point
In current engineering when drawing bridges,
no coordinate value is entered therefore

Figure 1: Example of Control Point

coordinate value is frequently recalculated atconstruction

stage.

mismatchingofThis

cause

Three dimensional coordinate of structure

connecting points between the upper member

installation reference marks shall be entered

and lower member.

into coordinate graphics as 3D design data

Also at the maintenance stage, estimation ofwhen handing over the drawing from thedeformation based on only actual structure size

design section to the construction section. Also

without the dimension entered in drawing.

surveyed measurements of reference marks are

Therefore, installation positions or connection

added to coordinate graphics that is handed

pointsthepositions

3. Data circulation

orofinstallation

could

structure

preventing

over from design section and the coordinate(Structure

installationgraphics shall be returned to design section as

reference mark) and monitoring point to grasp

construction blueprints. By this procedure

displacement or torsion of the structurebuilders can easily prepare data for monitoring(Monitoring reference mark) are set as positionreference marks from the design drawing andcoordinatesroad administrators also can have merits to

miss-installation(Controlpoint)

tocirculate

throughout design stage, construction stage,
and maintenance stage. The following Figure 1

keep construction blueprints for a long time.

4. Using skeleton model
Following Figure 2 is comparing skeleton[Reference]models before and after an earthquake.

Operation guideline related to bridge 3D data
circulation
http://www.nilim.go.jp/lab/qbg/cals2012/guideli
ne//guideline bridge.pdf

Figure 2: Comparing Skelton Models
A Skeleton model means a three dimensionalmodel drawn by connecting control points byusing straight line. Monitoring referencemarks at IC Bridge installed over the Heizou
River (kept by Chiba national highway office)in 2010 fiscal year were surveyed and askeleton model was drawn up and practicalityof skeleton model was verified.
By

comparing

twomodels

beforeanearthquake and after an earthquake as shownin Figure 2 the following bridge conditions areeasily grasped.
As a result, “The entire bridge has moved
approximately 17cm toward southeast andsunken 5cm – 12cm” and “Almost no relative
displacements are observed at each bridge
abutmentandbridge

column,also

nodeformation such as lean or torsion isobserved.”
In the future we are going to verify the effectof this method by implementing circulation,
introduction, and trial run construction work
related to designing and reviewed using thisstandard 3D data (control point and externalshape).