KR-20260065648-A - APPARATUS AND METHOD FOR OBTAINING STEEL BRIDGE DEFORMATION INFORMATION FOR SAFETY DIAGNOSIS

KR20260065648AKR 20260065648 AKR20260065648 AKR 20260065648AKR-20260065648-A

Abstract

The present invention relates to a device and method for acquiring deformation information of a steel bridge for safety diagnosis. The device for acquiring deformation information of a steel bridge for safety diagnosis comprises: a laser irradiation unit installed at one of two point locations within the steel box girder to irradiate a laser to an intermediate location between two point locations within the steel box girder; a light receiving unit installed at the intermediate location having a light receiving area for receiving a laser irradiated from the laser irradiation unit; and an image acquiring unit for acquiring an image including a laser image received in the light receiving area, wherein the point location is a location where relatively less deformation occurs than the intermediate location.

Inventors

조병근
김명수
남춘원
김희욱
김일영
강춘수
신광철

Assignees

주식회사 제일엔지니어링종합건축사사무소
주식회사 하나이엔씨종합건축사사무소

Dates

Publication Date: 20260511
Application Date: 20241101

Claims (11)

As a device for acquiring deformation information of a steel box girder of a steel bridge, A laser irradiation unit installed at the location of one of the two support points inside the steel box girder to irradiate a laser to an intermediate position between the two support points inside the steel box girder; A light receiving area for receiving a laser irradiated from the above laser irradiation unit and a light receiving unit installed at the above intermediate position; and It includes an image acquisition unit that acquires an image including a laser image received in the light receiving area, and A steel bridge deformation information acquisition device for safety diagnosis, wherein the above-mentioned point location is a location where relatively less deformation occurs than the above-mentioned intermediate location.
In paragraph 1, By installing the laser irradiation unit at the above-mentioned point location and the light receiving unit at the above-mentioned intermediate location, the laser irradiated from the laser irradiation unit changes to a relatively different location in the light receiving area according to the deformation of the steel box girder at the above-mentioned intermediate location and is received. A steel bridge deformation information acquisition device for safety diagnosis, wherein deformation information of the steel box girder is derived based on an image acquired by the image acquisition unit.
In paragraph 1, The above light receiving unit is, A light-receiving plate including the light-receiving area on the front surface positioned toward the laser irradiation unit; A mounting stand connected to the light receiving plate and having the image acquisition unit installed thereon; A steel bridge deformation information acquisition device for safety diagnosis, comprising a support member that supports the light receiving plate or the mounting bracket on the inner bottom surface side of the steel box girder.
In paragraph 3, The above support is, A support post connected to the mounting stand or the light receiving plate, provided to enable height adjustment and rotational adjustment around an axis of the up and down direction; A base plate connected to the bottom of the above support post; and A steel bridge deformation information acquisition device for safety diagnosis, comprising a plurality of magnetic units arranged on the above-mentioned support plate and pressing and fixing the support plate toward the inner bottom surface of the steel box girder.
In paragraph 3, The above light-receiving area is provided to be opaque, and The above mounting stand is positioned on the front side facing the laser irradiation unit among the lower sides of the light receiving plate, and The image acquisition unit is positioned on the mounting stand so as to obliquely look at the light receiving area formed on the front surface of the light receiving plate, and A steel bridge deformation information acquisition device for safety diagnosis, wherein the light receiving unit further includes a lighting unit disposed on the mounting base to illuminate the light receiving area.
In paragraph 3, The light-receiving area is provided to be semi-transparent so as to transmit some of the received light, and The above mounting stand is configured such that the image acquisition unit can acquire a laser image of the rear surface of the light receiving area from the rear of the light receiving plate, and The above image acquisition unit is installed on the above mounting stand, and A steel bridge deformation information acquisition device for safety diagnosis, wherein the degree of translucency of the light receiving area is set to allow for the acquisition of a laser image with a relatively narrowed area among the diffused laser light, taking into account the degree of diffusion when the laser irradiated from the laser irradiation unit reaches the light receiving area.
In paragraph 1, The above laser irradiation unit is, Laser irradiation unit; A stand positioned so as to face the light receiving area, wherein the above laser irradiation unit; A distance measuring device positioned on the above-mentioned stand facing the light receiving area; and It includes a tripod structure having three support members that extend in the vertical direction parallel to each other, wherein the upper end is fixed at three points in the plane to the mounting bracket and the lower end is fixed at three points in the plane to the lower end of the diaphragm at the support point. The above mounting bracket has three slots formed in the shape of elongated holes that extend radially in three directions in a planar shape, and Each of the three support members is detachably fixed to each of the three slots and can be positioned within the length range of each slot, and A steel bridge deformation information acquisition device for safety diagnosis, wherein the position adjustment of each of the three support members is performed by taking into account the specifications of the lower part of the diaphragm at the support point.
In Paragraph 7, A steel bridge deformation information acquisition device for safety diagnosis, wherein the lower ends of the three support members are fixed at three points in a plane to the front or rear corner of a transverse horizontal reinforcing member that extends transversely in a state protruding forward and rearward, respectively, from the diaphragm at the support section.
In Paragraph 7, Each of the three support members can have its upper end fixed to each of the three slots using a washer and a nut, thereby allowing the height of the mounting stand to be adjusted at three points on a plane. A steel bridge deformation information acquisition device for safety diagnosis, wherein the laser irradiation unit further includes a level placed on the mounting bracket.
In paragraph 1, In the light-receiving area, a reference marker is displayed to serve as a reference for calculating the deformation amount of the steel box girder, and The above-described steel bridge deformation information acquisition device for safety diagnosis further includes a control unit that generates notification information when it is determined that the amount of deformation of the steel box girder is excessively greater than a preset amount, taking into account the position of the laser image based on the reference marker.
A method for acquiring steel bridge deformation information using a steel bridge deformation information acquisition device for safety diagnosis according to paragraph 1, (a) a step of installing the light receiving unit at the intermediate position and installing the laser irradiation unit at the point position; and (b) a step of irradiating a laser onto a light-receiving area of a light-receiving unit using the laser irradiation unit, and acquiring an image including a laser image received in the light-receiving area using the image acquisition unit; and (c) A method for obtaining steel bridge deformation information for safety diagnosis, comprising the step of obtaining steel bridge deformation information based on the image obtained above.

Description

Apparatus and Method for Obtaining Steel Bridge Deformation Information for Safety Diagnosis The present invention relates to an apparatus and method for acquiring deformation information of steel bridges for safety diagnosis. More specifically, the present invention relates to a technology capable of acquiring deformation information, such as the shape and vibration frequency of a steel girder (steel box girder). In the case of steel bridges, distinct downward bending of the central part of the structure and vibration occur as loads are repeatedly applied. Since exceeding a certain threshold for such bending and vibration serves as evidence of changes in the structural characteristics, measuring these factors is a critical aspect. Consequently, in bridge safety assessments, obtaining deformation information for steel girders—such as measuring displacement of the superstructure and verifying vibration frequencies—is essential for confirming safety and serviceability. More specifically, in the case of bridge superstructures, an uplift is provided in advance to account for the deflection of horizontal members of slabs or girders due to the influence of superimposed loads, but the amount of uplift may change due to insufficient construction or damage during service. In addition, bridge superstructures have natural frequencies depending on their shape and support conditions, but the frequency may change due to a decrease in stiffness or changes in support conditions. If such displacements or vibration frequencies can be measured and managed at an early stage, the safety and usability of bridges can be managed efficiently. Accordingly, there has been a demand for the development of a device that enables the measurement of displacement (deflection) of structures or facilities, such as bridges, using optical means like lasers without the need for direct inspection or movement by an inspector. The technology forming the background of this invention is disclosed in Korean Patent Publication No. 10-0549297. FIG. 1 is a side conceptual diagram (conceptual diagram of configuration arrangement inside a steel box girder and detailed conceptual diagram by configuration) for explaining a steel bridge deformation information acquisition device and method for safety diagnosis according to one embodiment of the present invention. FIG. 2 is a schematic three-dimensional conceptual diagram for explaining the light receiving part of a steel bridge deformation information acquisition device for safety diagnosis according to one embodiment of the present invention. FIG. 3 is a conceptual diagram illustrating the light receiving area and reference marker of the light receiving part (light receiving plate) of a steel bridge deformation information acquisition device for safety diagnosis according to one embodiment of the present invention. FIG. 4 is a schematic side view and plan view illustrating another embodiment of a steel bridge deformation information acquisition device for safety diagnosis according to one embodiment of the present invention (an embodiment different from the one embodiment shown in FIG. 1 and FIG. 2). FIG. 5 is a schematic plan view, a partial cross-sectional view corresponding to one support member, and a three-dimensional conceptual diagram regarding a support and a tripod structure for explaining a laser irradiation unit of a steel bridge deformation information acquisition device for safety diagnosis according to one embodiment of the present invention. FIG. 6 is a photographic drawing illustrating the installation state of the laser irradiation unit of a steel bridge deformation information acquisition device for safety diagnosis according to one embodiment of the present invention. FIGS. 7 and 8 are three-dimensional conceptual diagrams for explaining that the lower end of the tripod structure of the laser irradiation unit of a steel bridge deformation information acquisition device for safety diagnosis according to one embodiment of the present invention is installed at the lower end of the diaphragm of the support section. Embodiments of the present invention are described below with reference to the attached drawings to enable those skilled in the art to easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals. Throughout the entire specification, when a part is described as being "connected" to another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly connected" or "electrically connected" with other elements interposed between them. Throughout the entire specification, when a component is described as being locate