KR101942460B1 - Bridge load test apparatus with minimun friction - Google Patents

Abstract

The present invention provides a bridge load test apparatus with minimized friction, wherein the friction is minimized to simply and correctly perform a bridge load test. According to the present invention, the bridge load test apparatus with minimized friction comprises: a first support rod extended in a vertical direction; a first plate connected to a first front end of the first support rod and having a plurality of first through-holes; a hollow support rod inserting a part of the first support rod thereinto to place a second front end of the first support rod therein and varying a length of a portion receiving the first support rod; a lubricant layer at least placed on the outer surface of the first support rod; a second plate connected to a front end, which is formed in an opposite direction to a direction of the first support rod, of the second support rod and including a plurality of second through-holes; and a displacement meter disposed in the second support rod and including a detection unit having one end protruding to be in contact with the second front end of the first support rod.

Description

[0001] The present invention relates to a bridge load test apparatus with minimun friction,

Embodiments of the present invention relate to a bridge load test apparatus, and more particularly, to a bridge load test apparatus capable of performing a simple and accurate bridge load test with minimal friction.

In general, to determine the accurate load-bearing capacity of a bridge structure, a predetermined load should be loaded on the bridge structure to measure the behavior of the actual structure. The most important behavior of the actual bridge is the displacement of the bridge structure due to the load, and it can be precisely measured and reflected in the calculation of the structure, so that the load bearing capacity of the bridge structure can be grasped accurately.

As a method for measuring the displacement of the bridge structure, there are various methods such as a displacement meter method, a laser method, or a photographic method. One of the most economical and accurate methods to measure is to measure the displacement by installing a displacement meter on a fixed frame. It is the most accurate way to install scaffold, but installing and dismantling scaffolds requires a lot of cost and time as well as securing the site where scaffolding can be installed. .

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a bridge load test apparatus capable of performing a simple and precise bridge load test with minimal friction. However, these problems are exemplary and do not limit the scope of the present invention.

According to an aspect of the present invention, there is provided a plasma processing apparatus comprising: a first support rod extending vertically; a first plate connected to a first end of the first support rod and having a plurality of first through holes; And a second supporting rod which is inserted in the first supporting rod and is located inside the first supporting rod and which is capable of varying the length of a portion accommodating the first supporting rod, And a displacement gauge having a second plate having a plurality of second through holes connected to the tip and having a detection part located inside the second support bar and having one end protruded so as to contact the second tip of the first support rod, A bridge load test system is provided.

The first plate is in close contact with the bridge to be tested and can be fastened to the bridge under test by bolts passing through the plurality of first through-holes.

The first plate is located at a lower portion of the bridge to be tested, is in close contact with the support portion spaced apart from the bridge to be tested, and can be fastened to the support portion by bolts passing through the plurality of second through holes.

The first plate may be flexible.

Wherein the first plate includes a first 1-1 plate connected to a first end of the first support bar and having a part of the plurality of first through holes, And a first joint part connecting the first 1-1 plate and the 1-2 plate to each other.

The second plate includes a second-1 plate connected to a distal end of the second support rod in a direction opposite to the direction of the first support bar and having a part of the plurality of second through-holes, And a second joint part that is located in a direction away from the second support bar and has the rest of the plurality of second through holes and a second joint part that connects the second-1 plate and the second-2 plate can do.

The first plate may include a first main plate connected to a first end of the first support bar, a second main plate connected to one end of the first main plate and extending in a direction in which the first support bar extends, 1-1 main plate, one end of which is connected to the other end of the first 1-1 extending plate, and the other end of the 1-2 main plate A 1-1 sub-plate having one end inserted into the 1-1 main plate through the other end of the 1-1 main plate and having a variable area of a portion inserted into the 1-1 main plate, A first 1-2 extension plate connected at one end to the other end of the 1-1 st sub plate and extending in a direction in which the first support bar extends and one end connected to the other end of the 1-2 extension plate, 1-1 parallel to the sub-plate and the other end located at the top of the 1-1 sub-plate And a 1-2 sub-plate.

Furthermore, the 1-2 main plate may have a portion of the plurality of first through holes, and the 1-2 sub-plate may have the rest of the plurality of first through holes.

And a lubricant layer disposed on at least a portion of the outer surface of the first support rod.

Other aspects, features and advantages of the present invention will become apparent from the following detailed description, claims, and drawings.

According to the embodiment of the present invention as described above, it is possible to implement a bridge load test apparatus which can easily and accurately perform a bridge load test with minimal friction. Of course, the scope of the present invention is not limited by these effects.

1 is a conceptual view schematically showing a bridge load test apparatus according to an embodiment of the present invention.
2 is a conceptual diagram schematically showing a part of a bridge load test apparatus according to another embodiment of the present invention.
3 is a conceptual diagram schematically showing a part of a bridge load test apparatus according to another embodiment of the present invention.
4 is a conceptual view schematically showing a part of a bridge load test apparatus according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention and methods of achieving them will be apparent with reference to the embodiments described in detail below with reference to the drawings. However, the present invention is not limited to the embodiments described below, but may be implemented in various forms.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or corresponding components throughout the drawings, and a duplicate description thereof will be omitted .

In the following embodiments, when various components such as layers, films, regions, plates, and the like are referred to as being " on " other components, . Also, for convenience of explanation, the components may be exaggerated or reduced in size. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.

In the following embodiments, the x-axis, the y-axis, and the z-axis are not limited to three axes on the orthogonal coordinate system, and can be interpreted in a broad sense including the three axes. For example, the x-axis, y-axis, and z-axis may be orthogonal to each other, but may refer to different directions that are not orthogonal to each other.

1 is a conceptual view schematically showing a bridge load test apparatus according to an embodiment of the present invention. 1, the bridge load test apparatus according to the present embodiment includes a first support rod 10, a first plate 20, a second support rod 40, a second plate 50, a displacement meter 60, Respectively.

The first support rods 10 formed of metal or the like extend up and down (along the z-axis). The first support rod 10 may include a 1-1 support rod 11, a 1-2 support rod 12 and a coupler 13 for connecting the 1-1 support rod 12 as shown in the figure. Of course, the first support rod 10 may include only the 1-1 support rod 11, and may further include additional support rods other than the 1-1 support rod 11 and the 1-2 support rod 12 It is possible. The first support bar 10 can have a length substantially corresponding to the support portion 1 such as the ground below the bridge 2 at the bottom surface of the bridges 2 of various heights. The coupler 13 connects the first support rod 11 and the second support rod 12 to each other. For example, the coupler 13 has a hollow shape and a threaded structure on the inner surface, -1 support bar 11 or the 1-2 support rod 12, as shown in Fig.

The first plate 20, which may be formed of metal or plastic, is connected to the first tip of the first support rod 10 (+ z direction). The first plate 20 has a plurality of first through holes 20a and is closely attached to the test target bridge 2 by bolts (not shown) passing through the plurality of first through holes 20a, .

The second support rod 40, which may be formed of a metal, is hollow. The second tip of the first support rod 10 in the -z direction is located inside the second support rod 40 so that a part of the first support rod 10 can be inserted into the second support rod 40 . The length of the portion of the second support rod 40 accommodating the first support rod 10 may vary. It can be understood that the length of the portion of the first support rod 10 inserted into the second support rod 40 is variable.

The second plate 50, which may be formed of metal or plastic, is connected to the distal end of the second support rod 40 in the direction opposite to the direction of the first support rod 10 (-z direction). The second plate 50 has a plurality of second through holes 50a and is positioned below the test target bridge 2 by bolts (not shown) passing through the plurality of second through holes 50a. And can be tightly fixed to the support 1, such as a ground, spaced from the bridge 2 to be tested.

The displacement meter (60) is located inside the second support rod (40). The displacement meter 60 has a main body 62 and a detecting portion 61 protruded so that one end of the main body 62 is in contact with the second tip of the first support rod 10 (-z direction). The displacement meter 60 may be fixed on a second plate 50, which may be formed of metal, plastic, or the like.

It is important to accurately measure the displacement of the bridge (2) that occurs during the test. The displacement amount of the bridge 2 is transmitted to the first support rod 10 and the detection part 61 of the displacement meter 60 located on the support part 1 is moved in the direction 1 displacement amount of the bridge 2 can be accurately measured by measuring the amount of movement of the first support rods 10 by contacting the support rods 10. In addition, in the case of the conventional bridge displacement test, displacement is measured by installing a displacement meter in a fixed frame such as a scaffold. However, installing and disassembling scaffolds requires a lot of cost and time, . Especially, when the distance from the supporting part (1) to the bridge (2) is too long, there is a problem that a very high scaffold must be installed and there is a risk of safety accident because the scaffolder There was a problem.

However, in the case of the bridge load test apparatus according to the present embodiment, it is not necessary to install such a scaffold, and the measurement is simple, and it is possible to effectively prevent the occurrence of a safety accident because the meter does not have to rise to such a high scaffold. Since the displacement of the bridge 2 is directly transmitted to the displacement meter 60 through the first support bar 10, the displacement of the bridge 2 can be accurately measured.

The displacement of the bridge 2 is sensed by the detection unit 61 of the displacement meter 60 via the first plate 20 and the first support rod 10. Since the second support bar 40 is fixed to the support portion 1 such as the ground below the bridge 2, the position of the first support bar 10 relative to the second support bar 40 Will be different. At this time, the displacement of the first support bar 10 relative to the second support bar 40 must be smoothly performed in accordance with the displacement of the bridge 2, so that displacement of the bridge 2 can be accurately measured at the displacement meter 60. To this end, the lubricant layer may be positioned on at least a part of the outer surface of the first support rod 10. The friction between the first support bar 10 and the second support bar 40 is minimized so that the change of the position of the first support bar 10 relative to the second support bar 40 smoothly changes according to the displacement of the bridge 2. [ So that the displacement of the bridge 2 measured by the displacement meter 60 can accurately correspond to the actual displacement occurring in the bridge 2.

On the other hand, the bottom surface of the bridge 2 to which the first plate 20 is adhered may be flat as shown in Fig. 1, but may also be a curved surface. In the case of the bridge load test apparatus according to another embodiment of the present invention, in the bridge load test apparatus according to the above-described embodiment, the first plate 20 can be made flexible. Accordingly, the displacement of the bridge 2 can be accurately measured by allowing the first plate 20 to be brought into close contact with the bottom surface of the uneven bridge 2 accurately.

Further, the first plate 20 may have a shape as shown in Fig. Specifically, the first plate may have a 1-1 plate 21, a 1-2 plate 22, 24, and a first joint 23, 25. The first 1-1 plate 21 is connected to a first end of the first support rod 10 in the (+ z direction) and has a portion 21a of a plurality of first through holes. The first and second plates 22 and 24 are located in a direction away from the first support bar 10 of the first 1-1 plate 21 and have the remainder 22a and 24a of the plurality of first through holes. The first joints 23 and 25 connect the 1-1 plate 21 and the 1-2 plate 22 and 24, respectively.

Here, the first joints 23 and 25 may have a structure such as a hinge. For example, the first joints 23 and 25 may have a structure in which the structure connected to the 1-1 plate 21 and the structure connected to the 1-2 plate 22 and 24 are engaged with each other so as to be relatively rotatable . Of course, a portion of the first joints 23 and 25 is part of the 1-1 plate 21 and the rest of the first joints 23 and 25 may be part of the 1-2 plate 22 and 24 And so on. The first 1-1 plate 21, the first 1-2 plates 22 and 24, and the first and second joints 23 and 25 may have a structure similar to a metal wristwatch as a whole.

According to the bridge load test apparatus of this embodiment, since the first joints 23 and 25 are present, the first plate can be closely attached to the lower surface of the bridge having various types of surfaces. Specifically, even when the lower surface of the bridge is an arch-shaped surface as shown in Fig. 2, the first plate of the bridge load test apparatus according to the present embodiment is formed so that its overall shape follows the shape of the curved surface of the lower surface of the bridge It can be easily deformed.

In FIG. 2, the 1-1 plate 21 has a portion 21a of a plurality of first through holes, but the present invention is not limited thereto. For example, the first 1-1 plate 21 does not have a through hole and only the 1-2 plates 22 and 24 located in a direction farther from the first support bar 10 of the 1-1 plate 21, And may have first through holes 22a and 24a. In this case, the area of the 1-1 plate (21) can be further narrowed, so that it can be made to correspond to the first support rod (10). Thus, even if the bottom surface of the bridge 2 is severely curved, the first plate can be more accurately aligned with the shape of the curved surface of the lower surface of the bridge 2 as a whole.

On the other hand, the description of the first plate 20 may be applied to the second plate 50 as well. The surface of the support 1 such as the ground below the bridge 2 to which the second plate 50 is adhered may be flat as shown in Fig. 1, but may also be a bent surface as shown in Fig. In the bridge load test apparatus according to another embodiment of the present invention, in the bridge load test apparatus according to the above-described embodiment, the second plate 50 can be made flexible. The second plate 50 is accurately brought into close contact with the surface of the uneven support portion 1 under the bridge 2 so that the second support rod 40 is stably engaged with the support portion 1, 10 to be accurately transmitted to the displacement gauge 60. [0053]

Furthermore, the second plate 50 may have a shape as shown in Fig. Specifically, the second plate may have a second-1 plate 51, a second-2 plate 52, 54, and a second joint 53, 55. The 2-1 plate 51 is connected to the tip of the second support rod 40 in the direction opposite to the direction of the first support bar 10 (-z direction), and a part 51a of the plurality of second through holes . The 2-2 plates 52 and 54 are located in a direction away from the second support bar 40 of the 2-1 plate 51 and have the remainder 52a and 54a of the plurality of second through holes. The second joints 53 and 55 connect the second-1 plate 51 and the second-2 plates 52 and 54 to each other.

Here, the second joints 53 and 55 may have a structure such as a hinge. For example, the second joints 53 and 55 may have a structure in which the structure connected to the 2-1 plate 51 and the structure connected to the 2-2 plate 52 and 54 are engaged with each other to be relatively rotatable . Of course, a portion of the second joint 53, 55 may be part of the second-1 plate 51 and the remainder of the second joint 53, 55 may be part of the second- And so on. In addition, the second-first plate 51, the second-second plates 52, 54, and the second joints 53, 55 may have a structure similar to a metal wristwatch as a whole.

The bridge load test apparatus according to the present embodiment is designed so that the second plate is tightly coupled to the upper surface of the support portion 1 such as a ground surface having various types of surfaces due to the presence of the second joint portions 53 and 55 can do. 3, the overall shape of the second plate of the bridge load test apparatus according to the present embodiment is such that, even when the upper surface of the support portion 1 such as the ground surface of the lower portion of the bridge is variously curved, It can be easily deformed to conform to the shape of the curved surface.

In FIG. 3, the second-1 plate 51 has a portion 51a of the plurality of second through-holes, but the present invention is not limited thereto. For example, the second-1 plate 51 does not have a through-hole, and only the second-2 plates 52, 54 located in a direction farther from the second support rods 40 of the second- And may have second through holes 52a and 54a. In this case, the area of the second-1 plate 51 can be further narrowed, so that it can be made to correspond to the second support bar 40 substantially. Thus, even when the upper surface of the support portion 1, such as the ground below the bridge 2, is severely curved, the second plate can be made to correspond more accurately to the shape of the curved surface of the support portion 1 as a whole.

4 is a conceptual view schematically showing a part of a bridge load test apparatus according to another embodiment of the present invention. As shown in FIG. 4, in the case of the bridge load test apparatus according to the present embodiment, the first plate has a different shape from the first plate of the bridge load test apparatus according to the above-described embodiments. The first plate includes a first main plate 251, a first extending plate 253, a first main plate 255, a first sub-plate 261, A plate 263 and a 1-2 sub-plate 265. [

The 1-1 main plate 251 is connected to the first tip of the first support rod 10 (+ z direction). The 1-1 main plate 251 has an empty space in a part as described later. One end of the first extending plate 253 is connected to one end of the first main plate 251 (in the + x direction) and the other end of the first supporting rod 10 is extended + z direction). The 1-2 main plate 255 is connected to the other end of the (1-1) extension plate 253 in the (+ z direction) direction. At this time, the 1-2 main plate 255 is substantially parallel to the 1-1 main plate 251, and the other end is positioned above the 1-1 main plate 251. That is, the first main plate 251, the 1-1 extending plate 253, and the 1-2 main plate 255 have a shape similar to a "b" bent twice as a whole when viewed from the side. The first support bar 10 may be connected to the lower surface of the 1-1 main plate 251 of the first plate.

The first 1-1 sub plate 261 is inserted into the 1-1 main plate 251 (in the + x direction) through the other end of the 1-1 main plate 251 (-x direction). At this time, the area of the portion of the 1-1th sub-plate 261 inserted into the 1-1 main plate 251 may vary. That is, a groove or an opening is formed at the other end of the 1-1 main plate 251 (-x direction) to extend into the 1-1 main plate 251, and the 1-1 sub plate 261 And a part thereof may be inserted into the groove or opening and slid with respect to the 1-1 main plate 251. [

One end of the first extending plate 263 is connected to the other end of the first sub-plate 261 (-x direction) and the other end of the first supporting rod 10 extends in the extending direction + z Direction. One end of the first sub-plate 265 (-x direction) is connected to the other end of the first elongated plate 263 (+ z direction). At this time, the 1-2 sub-plate 265 is substantially parallel to the 1-1 sub-plate 265, and the other end is positioned above the 1-1 sub-plate 261. That is, the first sub-plate 261, the first-second extended plate 263, and the first-second sub-plate 265 have a shape similar to a "C" shape bent twice as a whole when viewed from the side.

The recently constructed bridges are called PSC box girder bridges, which means that the girder, the main structure supporting the slab, which is the top plate of the bridges, connects between the piers is the PSC concrete box. In the case of such a PSC concrete box, as shown in Fig. 5, a protruding portion 2 'which is located below the main body 2' and the (-z direction) of the main body 2 'and laterally protrudes from the main body 2' ).

In the case of the bridge load test apparatus according to the present embodiment, it is possible to carry out the load test accurately and effectively without damaging the PSC concrete box in performing the load test of the PSC box girder bridge. Specifically, the 1-2 main plate 255 and the 1-2 sub-plate 265 are located above the protruding portion 2 "of the PSC concrete box, and the 1-1 stretch plate 253 and 1-2 By allowing the extension plate 263 to be located on the side of the projection 2 "of the PSC concrete box and to place the first 1-1 main plate 251 and the 1-1 second subplate 261 under the PSC concrete box , The first plate can be fixed to the PSC concrete box.

In this case, since the area of the part of the 1-1 sub-plate 261 inserted into the 1-1 main plate 251 can be variable, the 1-1 main plate 251 of the 1-1 sub- It is possible to effectively perform the load test on the bridge having the PSC concrete box of various widths by adjusting the area of the inserted portion. Furthermore, since it is not necessary to tighten the bolts or the like while making a hole in the PSC concrete box, the load test can be carried out accurately and effectively without damaging the PSC concrete box.

Of course, the 1-2 main plate 255 has a part 255a of the plurality of first through holes 255a and 265a of the first plate, and the 1-2 sub plate 265 has the first plate And may have the remaining 265a of the plurality of first through holes 255a and 265a. In this case, by inserting the bolts into the first through holes 255a and 265a so that the ends of the bolts contact the protruding portion 2 "of the PSC concrete box, the bolts do not puncture the PSC concrete box, The main plate 255 and the 1-2 subplate 265 may be fixed to the PSC concrete box.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art . Therefore, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: first support rod 20: first plate
40: second support rod 50: second plate
60: Displacement meter

Claims (3)

A first support rod extending vertically;
A first plate coupled to a first end of the first support bar and having a plurality of first through holes;
Wherein a portion of the first support rod is inserted such that a second end of the first support rod is located inside the second support rod, and a length of a portion accommodating the first support rod is variable;
A lubricant layer disposed at least on an outer surface of the first support rod;
A second plate connected to a distal end of the second support rod in a direction opposite to the first support rod direction and having a plurality of second through holes; And
A displacement gauge located within the second support rod and having a detection part protruded so that one end thereof can contact the second end of the first support rod;
And,
Wherein the first plate includes:
A first main plate connected to a first end of the first support bar;
A 1-1 extending plate connected at one end to one end of the 1-1 main plate and extending in a direction in which the first supporting bar extends;
A first main plate having one end connected to the other end of the first elongated plate and parallel to the first main plate and the other end positioned on the first main plate;
A 1-1 sub-plate having one end inserted into the 1-1 main plate through the other end of the 1-1 main plate and the area of the portion inserted into the 1-1 main plate being variable;
A first extension plate connected at one end to the other end of the 1-1 sub-plate and extending in a direction in which the first support bar extends; And
A first sub-plate having one end connected to the other end of the first-second extension plate, the first sub-plate being parallel to the first sub-plate and the other end located at an upper portion of the first sub-plate;
And a bridge load test device. delete The method according to claim 1,
Wherein the 1-2 main plate has a part of the plurality of first through-holes, and the 1-2 sub-plate has the rest of the plurality of first through-holes.

Images