KR102509254B1 - A method of measuring the displacement information of a girder capable of calculating the rotational displacement information of a PSC type I girder and a bridge construction method using the same - Google Patents

Abstract

According to one embodiment of the present invention, a method of measuring displacement information of a girder capable of calculating rotational displacement information of a PSC (prestressed concrete) girder may comprise: a displacement measurement unit installation unit of installing a displacement measurement unit including a plurality of displacement sensors on one surface of a PSC girder; a location information measurement step of measuring location information of the PSC girder by using the displacement measurement unit; and a displacement information calculation unit of calculating displacement information including longitudinal displacement of the PSC girder, longitudinal right-angle displacement, vertical displacement, and rotational displacement based on the location information. In addition, according to one embodiment of the present invention, a bridge construction method using a PSC-I-type girder may comprise: a first tensile force introduction step of introducing a first tensile force to the first steel strand and second steel strand at the same time after symmetrically disposing the first steel strand and the second steel strand to be spaced apart from each other on the bottom of the PSC girder; a deformation information calculation step of measuring location information of the PSC girder by using a deformation measurement device disposed on one surface of the PSC girder and calculating deformation information of the PSC girder based on the location information; and a second tensile force introduction step of introducing a second tensile force by adjusting the tensile force to each of the first steel strand and second steel strand based on the deformation information. Accordingly, the present invention can facilitate the maintenance of a girder.

Description

A method of measuring the displacement information of a girder capable of calculating the rotational displacement information of a PSC type I girder and a bridge construction method using the same}

The present invention relates to a method for measuring girder displacement information capable of calculating rotational displacement information of a PSC type I girder and a bridge construction method using the same, and more specifically, after measuring girder rotational displacement information more accurately than in the prior art, the measured result It is an invention related to a technology capable of manufacturing a safer girder by sequentially introducing tension into the girder based on the foundation.

The PSC type I girder is generally used for spans of 30M to 35M due to its excellent structural efficiency, economic feasibility, and constructability.

This long spanning increases the ratio of the span length (L) to the height (H) and the span length (L) to width (B), resulting in large deformations such as sweep and camber in the girder. there is. In addition, this deformation not only causes abnormal stress in the girder, but also has a risk of overturning during girder transportation and installation, and additional stress due to an increase in the thickness of the deck when laying the deck after girder installation occurs.

Deformations occurring in girders can be largely classified into transverse curvature and over-rise.

Specifically, the transverse curvature refers to a case where the central part of the girder is deformed in the direction perpendicular to the bridge axis, as shown in FIG. If it is caused by the eccentricity of the steel wire or by improper positioning of the lifting device when lifting the girder, and the over-rise is caused by the location of the sheath pipe being arranged differently from the design drawing, or the friction between the steel wire and the sheath pipe being different from the theoretical value It occurs because the cross-sectional area of the sheath pipe is not deducted when reviewing the case or structure.

Since the resulting transverse curvature and over-rise have a great influence on the structural stability of the girder, many methods have been proposed to solve this problem. The technologies proposed so far independently look at the causes of The way to solve this is also considered independently, and it is common to try to solve the transverse curvature itself or the oversurge itself.

However, since the rise and transverse bending that occur in the girder do not occur individually, most of them occur simultaneously during girder tension, so measuring and managing them separately can accurately diagnose the cause of girder deformation and countermeasures. will not be able to Therefore, it is necessary to more precisely analyze the deformation shape during tension and develop a method to measure it to effectively suppress the deformation of the PSC I type girder, which is becoming longer span. It is not possible to efficiently solve the deformation of the molded girder.

Korean Registered Patent No. 10-1131969 B1 - Multi-span continuous construction method of composite bridge using PSC I-type girder

A method for measuring girder displacement information capable of calculating rotational displacement information of a PSC I-girder according to an embodiment and a bridge construction method using the same are inventions designed to improve the above problems, and in measuring the displacement information of the girder, the rotational information The primary purpose is to provide a method that can more accurately measure the displacement information of the girder through a method that can measure up to .

In addition, by measuring displacement information for each tension step, arranging a fixing system to adjust the tension of the girder based on the measured displacement information, and introducing tension in sequence, thereby minimizing the occurrence of girder deformation and improving the structural stability of the girder. At the same time, the final purpose is to provide a method that can facilitate maintenance and repair of girders in the future.

A method for measuring displacement information of a girder capable of calculating rotational displacement information of a PSC girder according to an embodiment includes a displacement measurement unit installation step of installing a displacement measurement unit including a plurality of displacement measuring devices on one side of a PSC girder, using the displacement measurement unit A positional information measuring step of measuring positional information of the PSC girder and a displacement information calculating step of calculating displacement information including bridge shaft displacement, bridge shaft right angle displacement, vertical displacement and rotational displacement of the PSC girder based on the position information can do.

The displacement measuring unit installation step may include installing the plurality of displacement measuring units parallel to a vertical line meaning the vertical direction of the PSC girder when the displacement measuring unit is installed on the side surface of the PSC girder.

The displacement measuring unit installation step may include installing the plurality of displacement measuring units parallel to a bridge axis perpendicular line meaning a bridge axis perpendicular direction of the PSC girder when the displacement measurement unit is installed on the upper edge of the girder.

The displacement measuring unit installing step includes installing a plurality of displacement measuring units on one surface of the PSC girder in a direction parallel to the side surface of the PSC girder, and the position information measuring step includes the plurality of displacement measuring units. The step of measuring the location information of the PSC girder by using may include.

The displacement measurement unit installation step includes installing the plurality of displacement measurement units in a first region, a second region, and a third region of one surface of the PSC girder, respectively, and the displacement information calculating step includes the first region. Calculating displacement information based on the positional information of the PSC girder measured by the displacement measurement units installed in the region, the second region, and the third region, and calculating the average value of the calculated displacement information as the final displacement information can include

The location information measuring step measures the cross-axis coordinates (X), the cross-axis rectangular coordinates (Y), and the vertical coordinates (Z) of the PSC girder, and the displacement information calculating step includes the cross-axis coordinates, the cross-axis rectangular coordinates and vertical coordinates. Based on the coordinates, the rotational displacement of the PSC girder can be calculated.

In the bridge construction method using the PSC I-type girder according to an embodiment, after symmetrically arranging the first and second steel strands at a distance from each other at the lower edge of the PSC girder, the first tension force is applied to the first and second steel strands at the same time A first tension introduction step to introduce, a deformation information calculation step of measuring position information of the PSC girder using a strain measuring device disposed on one side of the PSC girder and calculating deformation information of the PSC girder based on the position information ; and a second tension introducing step of introducing a second tension force by adjusting the tension force in each of the first and second strands based on the deformation information.

The first tension is a tension of 40% to 60% of the maximum tension that can be introduced into the first and second strands, and the second tension is in the first and second strands. It may be a tension of 80% to 100% of the maximum tension that can be introduced.

Both ends of the first strand and the second strand may be respectively connected to fixing units disposed at both ends of the PSC girder.

In the bridge construction method using the PSC I-type girder according to an embodiment, the first and second steel strands are symmetrically arranged at a distance from each other at the lower edge of the PSC girder, and the third and fourth steel strands are symmetrically spaced apart from each other at the lower edge of the PSC girder. Placing strand arrangement step, first tension force introduction step of simultaneously introducing a first tension force into the first strand, the second strand, the third strand and the fourth strand, a strain measuring device disposed on one side of the PSC girder Deformation information calculation step of measuring positional information of the PSC girder by using and calculating deformation information of the PSC girder based on the positional information, and based on the deformation information, the first steel wire, the second steel wire, and the first A second tensioning force introduction step of additionally introducing a second tensioning force to each of the third and fourth strands may be included.

One end of the first strand and the second strand is connected to a first fixing unit disposed at one end of the PSC girder, and the other ends of the first strand and the second strand are exposed to the outside of the central portion of the PSC girder It is connected to the fourth anchorage, and the other ends of the third strand and the fourth strand are connected to the second anchorage disposed at the other end of the PSC girder, and the ends of the third strand and the fourth strand are connected to the second anchorage. It can be connected to the third anchorage part exposed to the outside of the central part of the PSC girder.

One end and the other end of the first strand and the second strand are respectively connected to the first anchoring portion and the second anchoring portion disposed at one end and the other end of the PSC girder, and ends of the third strand and the fourth strand. and the other end may be respectively connected to the third anchorage part and the fourth anchorage part exposed to the outside of the central part of the PSC girder.

The first strand, the second strand, the third strand, and the fourth strand include unattached strands, and the first anchoring portion, the second anchoring portion, the third anchoring portion, and the fourth anchoring portion include unattached strands. It may include at least one pair of anchorages capable of adjusting tension.

In the bridge construction method using the PSC I-type girder according to an embodiment, after symmetrically arranging the first and second steel strands at a distance from each other at the lower edge of the PSC girder, the fifth and sixth strands are symmetrically spaced apart from each other at the upper edge of the PSC girder. strand arrangement step of disposing, a third tension force introduction step of simultaneously introducing a third tension force into the fifth strand and the sixth strand, a tension force introduction step of simultaneously introducing a tension force into the first strand and the second strand, the above Deformation information calculation step of measuring position information of the PSC girder using a strain measuring device disposed on one side of the PSC girder and calculating deformation information of the PSC girder based on the position information, and based on the deformation information, the first A tension control step of relaxing the magnitude of the third tension force introduced into the fifth and sixth strands or introducing a fourth tension force, which is an additional tension force, may be included.

The third tension may be a tension of 40% to 60% of the maximum tension that can be introduced into the first non-attached strand and the second non-attached strand.

The girder displacement information measuring method capable of calculating the rotational displacement information of the PSC I-girder according to an embodiment of the present invention and the bridge construction method using the same calculate the displacement information of the girder by considering the rotational displacement of the girder, so it is more efficient than the prior art. There is an advantage of accurately calculating the shape information of the girder.

In addition, while introducing the tension force into the girder in stages, measuring the deformation of the girder at each stage, and adjusting the magnitude of the tension force based on the measured information to increase the structural stability of the girder compared to the prior art, and at the same time increasing the residual There is an advantage that the maintenance of the girder is very easy by leaving the tension force available for maintenance of the girder.

1 is a view showing a state in which transverse bending deformation occurs in a PSC I-type girder.
2 is a diagram showing a method of measuring the amount of transverse bending deformation when transverse bending deformation occurs in a PSC I-type girder according to the prior art.
3 is a diagram showing a method of measuring the amount of overstrain when overswelling occurs in a PSC I-type girder according to the prior art.
4 is a diagram showing a comparison between theoretically generated displacement and actually generated displacement when rotational displacement is not considered in the PSC I-type girder.
5 and 6 are views showing a method of measuring the amount of deformation based on the side of the girder according to an embodiment of the present invention.
7 is a view showing a method of measuring the amount of deformation based on the upper surface of the girder according to an embodiment of the present invention.
8 is a result table for calculating displacement information of a girder based on information measured by a displacement measuring unit according to the present invention, and FIG. 9 is a diagram for explaining a method of calculating rotational displacement information according to the present invention. .
10 is a diagram illustrating a sequence of introducing a tension force to a tension member according to an embodiment of the present invention.
11 is a view showing the arrangement of a strand and a fixing unit according to an embodiment of the present invention.
12 and 13 are views looking at the arrangement of strands and anchorages from various angles according to various embodiments of the present invention.
14 is a table showing design values and measured values for a first tension force and a second tension force according to an embodiment of the present invention.
15 is a view for explaining problems that may occur during girder tension.
16 is a view for explaining the order in which tension force is introduced to the girder according to another embodiment of the present invention.
17 is a view for explaining the range of the most effective first tension force when a tension force is introduced to the girder according to FIG. 16.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the technical idea of the present invention is not limited to some of the described embodiments and can be implemented in various different forms, and if it is within the scope of the technical idea of the present invention, one or more of the components between the embodiments It can be used by selectively combining or substituting.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention, unless explicitly specifically defined and described, can be generally understood by those of ordinary skill in the art to which the present invention belongs. It can be interpreted as meaning, and commonly used terms, such as terms defined in a dictionary, can be interpreted in consideration of the contextual meaning of related technology.

Also, terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention. In this specification, the singular form may also include the plural form unless otherwise specified in the phrase, and when described as "at least one (or more than one) of A and (and) B and C", a combination of A, B, and C may include one or more of all possible combinations.

Also, terms such as first, second, A, B, (a), and (b) may be used to describe components of an embodiment of the present invention. These terms are only used to distinguish the component from other components, and the term is not limited to the nature, order, or order of the corresponding component.

In addition, when a component is described as being 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected to, coupled to, or connected to the other component, but also the component It may also include cases of being 'connected', 'combined', or 'connected' due to another component between the and other components.

In addition, when it is described as being formed or disposed on the "top (top) or bottom (bottom)" of each component, the top (top) or bottom (bottom) is not only when two components are in direct contact with each other, but also It also includes cases where one or more other components are formed or disposed between two components. In addition, when expressed as "up (up) or down (down)", it may include not only an upward direction but also a downward direction based on one component.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted.

Meanwhile, the title of the present invention has been described as 'Method for measuring girder displacement information capable of calculating rotational displacement information of PSC I-girder and bridge construction method using the same', but in the following specification, for convenience of description, 'Rotation of PSC I-girder' The girder displacement information measurement method capable of calculating displacement information and the bridge construction method using the same are referred to as 'girder displacement information measurement method' and 'bridge construction method', respectively, and the girder in the present invention has various types of It means a girder that collectively refers to all girders, but for convenience of description below, it will be described on the premise that it is a PSC I type girder.

2 is a diagram showing a method of measuring the amount of transverse bending deformation when transverse bending deformation occurs in a PSC I-type girder according to the prior art, and FIG. 4 is a diagram showing a method of measuring the amount of overstrain deformation, and FIG. 4 is a diagram showing a comparison between theoretically generated displacement and actual generated displacement when rotational displacement is not considered in the PSC I-type girder.

Referring to FIG. 2, a method for measuring transverse bending deformation according to the prior art is described. When transverse bending deformation occurs in a girder, a wire or nylon string is placed on the side of the girder immediately before tension is applied to the tendon material or collectively measured after tension. After installing the back, measure the distance between the string and the girder, and measure the distance between the installed string and the girder again after tensioning the tension member, and measure the transverse bending deformation length with the difference. If the measured value exceeds the allowable value, additional tension is introduced into the girder to reduce the size of the transverse bending, or the transverse bending deformation is controlled by applying force in the direction perpendicular to the girder's bridge axis.

Referring to FIG. 3, the method for measuring the amount of deformation of the rise is described. The height of the bottom surface of the lower edge of the girder is measured after most of the A-shaped hardware installed on the ground is installed on the side of the girder and before tension is applied to the tension member. After that, the height of the bottom surface of the lower edge of the girder after tension is introduced is measured, and the amount of rise is determined by the difference. will be established The installation location of the rise measuring device is installed at both ends and the center of the girder in three places to measure the relative height difference between the support and the center, and it is common to install it only on one side of the girder.

However, this measurement method according to the prior art is based on the premise that the horizontal curvature and the over-extension problem are solved independently under the assumption that the horizontal curvature and the over-extension problem are not related to each other. However, as described above, most of the deformations occurring in the girder occur at the same time due to the introduction of tension force, and in the case of the prior art, the problem of lateral curvature and over-rise is regarded as a separate problem, and this Since it is managed, there was a problem that it was not possible to accurately establish the cause of the deformation of the girder and the countermeasures accordingly. In addition, since the deformation is corrected after the tension on the girder is completed, there is a problem that the stability of the girder is lowered due to excessive force being applied to the girder body.

In addition, since the method of measuring transverse curvature and elevation in the same way as in the prior art measures only the displacement and vertical displacement generated in the girder separately, A separate countermeasure will be prepared. However, the displacement occurring in the girder is not only displacement in the direction of the bridge axis, displacement in the direction perpendicular to the bridge axis, vertical displacement, but also rotational displacement occurs at the same time. Since this is not considered in the case of the prior art method, it is theoretically predicted as shown in FIG. There was a problem that the theoretically suggested alternative method was not appropriate because the one displacement and the actual displacement occurred differently.

In addition, in the method of controlling the displacement generated in the girder according to the prior art, when an over-displacement occurs in the girder, additional tension is introduced into the girder or force is applied to correct the displacement in order to correct this problem. Solve this problem However, since this method is a method of correcting the displacement without considering the stability of the girder, there is a very bad disadvantage of harming the structural stability of the girder when compensating the displacement forcibly.

Therefore, the girder displacement information measurement method and the bridge construction method using the same according to the present invention are methods devised to solve the above-described problems, and in measuring the girder displacement information, the rotation information can be measured more accurately through a method. The primary purpose is to provide a method for measuring girder displacement information.

In addition, by sequentially adjusting the tension of the girder based on the displacement information measured step by step in this way, the structural stability of the girder is improved by minimizing the occurrence of girder deformation, and at the same time, it is easy to maintain and repair the girder in the future. Its purpose is to provide a way to do it. Let's find out in detail through the drawings below.

5 and 6 are diagrams showing a method of measuring the amount of deformation based on the side surface of a girder according to an embodiment of the present invention, and FIG. 7 is a diagram showing the amount of deformation based on the upper surface of a girder according to an embodiment of the present invention. It is a drawing showing how to measure.

In measuring girder displacement information, the girder deformation measurement method according to the present invention does not measure displacement information based on information measured at one point of the girder as in the prior art, but at a plurality of points on one side of the girder. After calculating the girder position information, the girder displacement information is calculated based on the information measured by the displacement measuring device for each of a plurality of points, and based on this, the girder bridge displacement, vertical displacement, displacement perpendicular to the bridge shaft, and rotational displacement are calculated. this exists

Specifically, as shown in (a) of FIG. 5, after setting the measuring points A and B at the top and bottom at one point on the side of the girder, respectively, the coordinates of the girder at each point A, B (X), the bridge rectangular coordinate (Y) and the vertical coordinate (Z) are measured, and based on the measured information, as shown in (b) of FIG. information, displacement information in a direction perpendicular to the bridge axis, and displacement information in a vertical direction can be calculated. In addition, the relative movement value can be measured based on the location information measured at the two points A and B, and based on this, girder rotational displacement information can be calculated.

That is, in the case of the prior art, since girder displacement information was calculated based only on information measured at one point on one side of the girder, there was a disadvantage in that only displacement information in the girder bridge direction and displacement in the vertical direction could be calculated. However, according to the measuring method according to the present invention, since the relative movement information of the girder can be calculated based on the girder position information measured at a plurality of points on one side of the girder, there is an advantage in that the girder rotational displacement information can also be measured. Accordingly, there is an advantage in that the girder deformation shape information can be more accurately measured than in the prior art.

Meanwhile, in FIG. 5, it is shown that the girder position information is calculated only at two upper and lower points (A and B) for one point based on the side of the girder, but the embodiment of the present invention is not limited to this, and the girder position information Measurement points that can be measured can be set to 3 or more.

And when girder displacement information is calculated at three or more points in this way, the point for measuring the girder position information can be arranged on a straight line parallel to the vertical line meaning the vertical direction (Z) of the girder.

In addition, although FIG. 5 shows that there is only one displacement measuring unit 400 disposed on the side of the girder, the embodiment of the present invention is not limited thereto, and as shown in FIG. 6, three displacement measuring units 400 may be disposed on the side of the girder. And, unlike the drawings, more may be arranged.

In addition, as another embodiment of the present invention, as shown in FIG. 6, girder displacement information can be calculated using a plurality of displacement measuring units. Specifically, the final bridge shaft displacement information, bridge shaft right angle displacement information, vertical displacement information, and rotational displacement information of the girder can be calculated using the displacement information values calculated by each displacement measuring device.

Meanwhile, in FIGS. 5 and 6, it is shown that the displacement measurement unit 400 is installed only on the side of the girder to calculate the girder position information, but the embodiment of the present invention is not limited to this, and the girder position information is based on the upper surface of the girder. can be measured and based on this, girder displacement information can be calculated.

Specifically, as shown in FIG. 7, after disposing the displacement measuring unit 400 capable of measuring information on a plurality of points on the upper surface of the girder on the upper part of the girder 100, each displacement measuring unit at the plurality of points Based on the measured information, girder position information is measured, and based on this, girder bridge displacement information, bridge shaft right angle displacement information, vertical displacement information, and rotational displacement information can be calculated. The method of calculating each displacement information is omitted as described above.

For example, as shown in FIG. 6, after dividing the length of the girder into thirds and dividing them into first, second, and third areas, a displacement measuring device is placed in each area, and each displacement measuring device measures Based on one information, various displacement information of the girder can be measured.

Meanwhile, in FIG. 7 , the displacement measuring unit 400 is illustrated as including two displacement measuring devices 410 and 420, but as described above, one displacement measuring unit may include three or more displacement measuring devices, and the girder Displacement measuring units disposed on the upper surface may also have two, three or more displacement measuring units disposed differently from those shown in FIG. Can be placed on one line.

8 is a diagram showing a result table for calculating displacement information of a girder based on information measured by a displacement measuring unit according to the present invention, and FIG. 9 is for explaining a method of calculating rotational displacement information according to the present invention. it is a drawing

Referring to FIGS. 8 and 9, referring to the rotational displacement measurement method based on the end point of the girder, the rotational displacement (unit-radian) is referred to as a, L is the difference value due to the upper and lower lateral displacement of the girder, and h is the girder If defined as the upper and lower measurement lengths of , it can be expressed as tan(a)=L/h, and by converting it into an inverse function, it can be defined as a=tan ^-1 (L/h).

Therefore, based on this, calculating the rotational displacement of the end point of the girder in FIG. 8 (measurement distance of the upper and lower edges during tension = 651mm, upper lateral displacement = 5mm, lower lateral displacement = 1mm, upper and lower lateral displacement difference = 4mm), the rotational displacement is finally as follows can be calculated.

tan ^-1 (4/651) = 0.00614 = about 0.006

10 is a view showing the order of introducing a tension force to a tension member according to an embodiment of the present invention, and FIG. 11 is a view showing the arrangement of a strand and a fixing unit according to an embodiment of the present invention, specifically FIG. (a) is a view showing the arrangement of strands at the top of the girder, Figure 11 (b) is a view showing the arrangement of strands and anchorages on the side of the girder, Figure 11 (c) is a view showing cross-sectional views of the girder viewed from various points.

10 to 11, the lower edge 130 of the girder according to the present invention may include two strands 210 and 220 symmetrically disposed to introduce tension, and the strands are transverse to the girder. It is a stranded wire for resolving curvature deformation or overextension deformation. On the other hand, in the drawings, it is shown that there is one strand in the lower edge 130 of the girder, but this is for convenience of description, and each strand may include a plurality of strands, and the girder 100 includes strands in addition to the strands shown in the drawing. A plurality of tension members for introducing tension to the girder may be included.

Referring to FIG. 10, looking at the order of introducing tension, after arranging the strands on the lower edge of the girder 130 as shown in FIG. 10 (a), the first strands 210 and the second strands 220 Introduce tension. After the first tension is introduced, the girder position information is measured using a strain measuring device, and girder deformation information is calculated based on the measured girder position information. And, as a result of analyzing the calculated deformation information, if transverse curvature and over-rise occur in the girder, the second tension force is introduced by adjusting the magnitude of the tension force of the first strand 210 and the second strand 220, respectively.

Specifically, the method of calculating the deformation information of the girder after the first tension is introduced can calculate the girder deformation information based on the measurement method described in FIGS. 4 to 9, and the first tension is the first steel wire (210 ) and 40% to 60% of the maximum tension that can be introduced into the second strand 220, and the second tension includes the first tension when the first strand 210 and the second strand 220 ) may mean a tension of 80% to 100% of the maximum tension that can be introduced into.

Introducing the tension force to the girder by dividing it into two or more times is to effectively suppress the girder deformation while minimizing the effect on the girder stability by analyzing the girder shape that can be deformed according to the tension and then introducing the adjusted tension force based on this analysis. It is for

Specifically, girders are damaged due to their characteristics over time due to aging and deterioration of concrete, or long-term losses in which the steel wire tension introduced into the girders is reduced. In addition, in some cases, a problem such as a large sagging due to an increase in dead weight due to repacking occurs, and maintenance is performed to overcome this problem. However, in the former case, repair and reinforcement of the exterior of the girder is performed only when damage occurs, so it is impossible to devise a plan for this in the design stage, whereas in the latter case, it is possible to predict in the design stage. In particular, since long-term loss is a loss that inevitably occurs in the girder, designing in consideration of this in advance has the advantage of increasing girder stability and furthermore, easy maintenance and management of the girder.

Therefore, if the girder is designed by dividing the tension into the girder as in the present invention, the final tension when manufacturing the girder is calculated by calculating the re-tension margin, deducted by that much, and later used by the margin to introduce additional tension into the girder. There are advantages to being able to In addition, when tension force is introduced to the girder in this way, even if the long-term loss actually occurs larger than the long-term loss predicted at the time of design or the surcharge load is increased due to repacking, it is effective to efficiently repair and manage the girder. .

On the other hand, in order to introduce the tension force to the girder, the anchorage must be arranged, but in the case of the present invention, the anchorage is provided in various forms to efficiently introduce the tension force step by step.

For example, as shown in FIG. 11, the anchorage includes a first anchorage 310 in which the first and second strands 210 and 220 symmetrically disposed on the lower edge 130 of the girder are disposed at both ends of the girder, respectively. It may be implemented in a form fixed to the second anchorage 320 . Accordingly, tension can be gradually introduced into the first strand 210 and the second strand 220 through the first anchorage 310 and the second anchorage 320 .

Hereinafter, a form capable of maintenance, which is one of various embodiments of the present invention, will be looked at through FIGS. 12 and 13.

12 and 13 are views of strands and anchorages arranged according to various embodiments of the present invention viewed from various angles, and FIG. 14 is a first tension force and a second tension force according to an embodiment of the present invention. This table shows the design values and measured values for

Referring to FIG. 12, it may include four strands 210, 220, 230, and 240 that are symmetrically disposed on the lower edge 130 of the girder according to an embodiment to introduce tension. For example, as shown in FIG. 12, each is disposed on both sides of the girder, and the first and second strands 210 and 220 extending from one end of the girder to the center of the other end of the girder and on both sides of the girder, respectively. and may include a third strand 230 and a fourth strand 240 extending from the other end of the girder to the center of one end of the girder.

Therefore, the first steel wire 210 and the second steel wire 220 have one end of the first steel wire 210 and the second steel wire 220 disposed at one end of the girder 100, as shown in FIG. Each anchorage is anchored in the first anchorage 310, and the other ends of the first and second strands 210 and 220 are located in the fourth anchorage 340 disposed in the central portion of the other end of the girder 100 in a form exposed to the outside. Each can be settled.

In addition, the other ends of the third strand 230 and the fourth strand 240 are connected to the second anchorage 320 disposed at the other end of the girder 100, respectively, and the third strand 230 and the fourth strand ( 240) may be respectively connected to the third anchorage 330 disposed in a form exposed to the outside at the center of one end of the girder 100.

In addition, the four strands 210, 220, 230, 240 may be arranged in other forms. As shown in FIG. 13, the first strand 210 and the second strand 220 are on both sides of the girder, respectively. Arranged, arranged in a form extending from one end of the girder 100 to the other end of the girder 100, and the third strand 230 and the fourth strand 240 extend from the central part of one end to the central part of the other end of the girder 100 can be placed respectively.

Therefore, the first steel wire 210 and the second steel wire 220, as shown in FIG. 13, the first steel wire 210 and the second steel wire 220 are respectively disposed at one end and the other end of the girder 100 It is fixed in the first anchorage 310 and the second anchorage 320, respectively, and is exposed to the outside at the center of one end and the center of the other end of the girder 100 of the third and fourth strands 230 and 240, respectively. It can be fixed to the third anchorage 330 and the fourth anchorage 340 respectively.

As shown in FIGS. 12 and 13, when anchoring the strand to the fixing part exposed to the outside of the middle of the girder, as described above, when maintenance of the girder 100 is required and additional tension must be introduced, the girder 100 ) Since additional tension can be easily introduced through the anchorage exposed to the outside of the girder 100, there is an advantage that the girder 100 can be managed and repaired more efficiently.

12 and 13, when tension is introduced into the strand using an anchorage exposed to the outside of the middle of the girder, the strand is implemented as an unbonded strand so that the tension can be effectively introduced into the strand, The anchorage can be implemented as an anchorage with an anchorage system capable of additional tension, further increasing the maintenance efficiency of the girder 100.

Specifically, the method for calculating the deformation information of the girder after introducing the first tension in FIG. 12 can calculate the deformation information of the girder based on the measurement method described in FIGS. 4 to 9, and the first tension is the first tension. It is 40% to 60% of the maximum tension force that can be introduced into the first strand 210 and the second strand 220, and when the second tension includes the first tension, the first strand 210 and the first strand It may mean a tension of 80% to 90% of the maximum tension that can be introduced into the second strand 220.

The tension of 10% to 20%, which is the residual tension, can be easily used for maintenance by tensioning through the third anchorage 330 and the fourth anchorage 340 exposed to the outside of the girder during maintenance.

On the other hand, in FIG. 13, the method of calculating the deformation information of the girder after introducing the first tension can calculate the deformation information of the girder based on the measurement method described in FIGS. 4 to 9, and the first tension is the third It is 40% to 60% of the maximum tension force that can be introduced into the strand 230 and the fourth strand 240, and the second tension force is the third strand 230 and the fourth strand when including the first tension force. It may mean a tension of 80% to 90% of the maximum tension that can be introduced into the strand 240.

The residual tension of 10% to 20% can easily maintain the girder by tensioning it through the third anchorage 330 and the fourth anchorage 340 exposed to the outside of the girder during maintenance.

15 to 17 are views for another embodiment of the present invention, FIG. 15 is a view for explaining problems that may occur during girder tension, and FIG. 16 is a view for introducing tension into the girder according to another embodiment of the present invention. 17 is a diagram for explaining problems and effects when the initial tension is changed according to another embodiment of the present invention.

In general, when the length of the PSC type I girder is about 30 to 50 m, it is possible to manufacture a girder that is safe from deformation by the method described above, but when the girder length is longer than that range, the span length (L) vs. As the ratio of (L) to width (B) becomes larger and larger, there is a concern that the deformation cannot be controlled only with the above-described method. That is, as shown in FIG. 12, when the maximum tension is introduced into the long span, tension may occur at the upper edge of the central part of the girder, and if an impact is applied during transportation, there is a risk of large deformation and damage to the girder. In addition, there is a problem that this deformation can increase the transverse curvature of the girder by generating a greater tensile force on the upper edge of the central part.

Therefore, the present invention is an invention devised to solve this problem, and the purpose of the present invention is to control the tensile stress that may occur in the girder by arranging strands at the upper and lower ends of the girder, and introducing tension in stages.

Referring to FIG. 16, the first and second strands 210 and 220 disposed on the lower edge 130 of the girder and the fifth strand 250 disposed on the upper edge 110 of the girder according to the present invention It may include 6 strands 260, and as shown in the drawing, the first strand 210 and the second strand 220 may be symmetrically arranged, and the fifth strand 250 and the sixth strand ( 260) can also be arranged symmetrically.

On the other hand, the strands shown in FIG. 16 may be implemented as non-attached strands, each strand may include one or a plurality of strands, and as in the present invention, when the strands are arranged symmetrically to the left and right, tension It is very effective in controlling the tensile stress generated in the girder upper edge 110 during transportation.

Referring to the method of controlling the deformation and tensile stress of the girder, before introducing tension to the first strand 210, the second strand 220, and the central strand 270, the girder upper edge 110 is disposed A third tension force corresponding to 40% to 60% of the maximum tension that can be tensioned in the 5th twist 250 and the 6th twist 260 is introduced into the 5th twist 250 and the 6th twist 260 After (FIG. 16 (a)), tension may be introduced into the first and second strands 210 and 220 symmetrically disposed on the lower edge 130 of the girder. (Fig. 16 (b))

When tension is introduced into the girder 100 in this way as in the present invention, the compression resistance of the first and second strands 210 and 220, which are already tense at the center of the girder, suppresses transverse curvature and oversurge effect can be obtained.

On the other hand, after the tension of all strands is over, when the displacement of the girder is measured and the transverse curvature and rise are measured to exceed the allowable value, within the remaining tension range of the fifth strand 250 and the sixth strand 260 The girder deformation can be controlled by introducing a fourth tension force, which is an additional tension force, or by relaxing the third tension force already introduced to the fifth strand 250 and the sixth strand 260.

That is, when tension is first introduced into the strands disposed on the upper edge 110 of the girder and then tension is introduced into the strands disposed on the lower edge 130 of the girder, as in the present invention, compression of the strand already tensioned on the upper edge 110 of the girder is applied. It is possible to effectively suppress the girder transverse bending and deformation that may occur during transportation due to the resistance, and since the tension is left on the strands placed on the girder stage, when the girder deformation occurs later, the girder There is an advantage that can compensate for the displacement of .

17 is a view for explaining the range of the most effective first tension force when tension is introduced into the girder according to FIG. 16, the left view of FIG. 17 is a view when the girder is viewed from the side, and the right side of FIG. The drawing is a view when looking at the girder from the end side.

Referring to FIG. 17, when the magnitude of the third tension introduced into the fifth and sixth strands 250 and 260 is 0, as in (a) of FIG. 17, no tension is introduced into the girder upper edge 110. Therefore, there is no tensile stress suppression force generated in the girder limb that can occur during girder transportation.

However, in this case, even if the tension is adjusted by adjusting the tension between the first and second strands 210 and 220, transverse curvature may occur in the girder. In this case, the fifth strand 250 disposed on the girder stage 110 And by tensioning the sixth strand 260, it is possible to control the transverse curvature.

On the other hand, as another example, when the magnitude of the third tension introduced into the fifth and sixth strands 250 and 260 is 50% of the maximum tension as shown in FIG. 17 (b), the girder stage 110 Since the tension force has already been introduced to some extent, it is possible to effectively resist to some extent the tensile stress that may occur in the girder staging when the tension force is introduced to the first strand 210 and the second strand 220 and when the girder is transported.

However, in this case, even if the tension is adjusted by adjusting the tension of the first strand 210 and the second strand 220, transverse curvature may occur. In this case, one of the fifth strand 250 and the sixth strand 260 By removing the third tension and adding tension as much as the third tension to the remaining strands, the transverse curvature can be controlled to the same extent as when the third tension is zero.

As another example, when the magnitude of the third tension force introduced into the fifth and sixth strands 250 and 260 is 100% of the maximum tension as shown in (c) of FIG. 17, the girder stage 110 Since the tension force is introduced as the maximum tension force in the first strand 210 and the second strand 220, the restraining force for the tensile stress of the girder upper edge generated when the tension force is introduced and when the girder is transported is maximized. However, since a large compressive force is introduced to the upper edge of the girder, there is a disadvantage in that the tension effect of the lower edge of the girder introduced by the first and second steel wires 210 and 220 is halved.

That is, based on these results, when the magnitude of the third tension introduced at the lower edge of the girder is 40% to 50% (preferably 50%) of the maximum tension, the first strand 210 and the second strand ( 220), it is possible to effectively control the displacement that occurs during tension and the displacement that occurs during girder transportation, and at the same time, it is possible to effectively control the transverse bending displacement of the girder with the residual tension force, thereby increasing the structural stability of the girder. do.

So far, the method of measuring the displacement information of the girder capable of calculating the rotational displacement information of the PSC type I girder according to the present invention and the bridge construction method using the same have been studied through the drawings.

The method for measuring displacement information of a girder capable of calculating rotational displacement information of a PSC type I girder according to an embodiment of the present invention and the bridge construction method using the same calculate girder displacement information by considering the rotational displacement of the girder, so that the rotational displacement information of the girder is calculated. There is an advantage of effectively calculating girder deformation information.

In addition, the order of tensioning the tension introduced into the girder is adjusted in consideration of the characteristics of the girder and the strands arranged on the girder, and the size of tension is also divided into divisions for easy maintenance in the future, so that the structure of the girder is higher than in the prior art. At the same time as increasing stability, there is an advantage of very easy maintenance of the girder.

In the above, even though all the components constituting the embodiment of the present invention have been described as being combined or operated as one, the present invention is not necessarily limited to these embodiments. That is, within the scope of the object of the present invention, all of the components may be selectively combined with one or more to operate.

In addition, terms such as 'include', 'comprise' or 'having' described above mean that the corresponding component may be present unless otherwise stated, and thus exclude other components. It should be construed as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs, unless defined otherwise. Commonly used terms, such as terms defined in a dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and unless explicitly defined in the present invention, they are not interpreted in an ideal or excessively formal meaning.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection according to the present invention should be construed according to the scope of the claims below, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: girder
110: staging girder
130: Girder Hayeon
210: 1st lecture line
220: second lecture line
230: 3rd lecture line
240: 4th lecture line
250: 5th lecture line
260: 6th lecture line

Claims (15)

A displacement measuring unit installation step of installing a displacement measuring unit including a plurality of displacement measuring devices on one side of the PSC girder;
A first tension introducing step of symmetrically arranging the first and second strands at a distance from each other at the lower edge of the PSC girder, and then simultaneously introducing the first tension into the first and second strands;
Positional information measuring step of measuring positional information including information about bridge coordinates (X), orthogonal coordinates (Y) and vertical coordinates (Z) of the PSC girder using the displacement measuring unit; and
Based on the location information, displacement information including bridge displacement, bridge orthogonal displacement, vertical displacement and rotational displacement of the PSC girder is calculated, and based on the bridge shaft displacement, the bridge orthogonal displacement and the vertical displacement of the PSC girder a displacement information calculation step of calculating the rotational displacement; and
A second tension introducing step of introducing a second tension force by adjusting the tension in each of the first and second strands based on the displacement information; characterized in that it comprises,
A bridge construction method using a girder displacement information measurement method capable of calculating rotational displacement information of PSC girders. According to claim 1,
In the displacement measurement unit installation step,
When the displacement measuring unit is installed on the side of the PSC girder, installing the plurality of displacement measuring units in parallel with a vertical line meaning the vertical direction of the PSC girder; characterized in that it comprises,
A bridge construction method using a girder displacement information measurement method capable of calculating rotational displacement information of PSC girders. According to claim 1,
In the displacement measurement unit installation step,
In the case of installing the displacement measuring unit on the upper edge of the girder, installing the plurality of displacement measuring units in parallel with the bridge axis perpendicular line meaning the bridge axis perpendicular direction of the PSC girder; characterized in that it comprises,
A bridge construction method using a girder displacement information measurement method capable of calculating rotational displacement information of PSC girders. According to claim 2 or 3,
In the displacement measurement unit installation step,
Installing a plurality of displacement measuring units on one side of the PSC girder in a direction parallel to the side surface of the PSC girder,
The location information measurement step,
Characterized in that the step of measuring the position information of the PSC girder using the plurality of displacement measuring units comprises,
A bridge construction method using a girder displacement information measurement method capable of calculating rotational displacement information of PSC girders. According to claim 4,
In the displacement measurement unit installation step,
Installing the plurality of displacement measuring units in the first area, the second area, and the third area of one side of the PSC girder, respectively,
In the displacement information calculation step,
Displacement information is calculated based on the positional information of the PSC girder measured by displacement measurement units installed in the first area, the second area, and the third area, and the average value of the calculated displacement information is calculated as the final displacement information. Characterized in that it includes the step of doing,
A bridge construction method using a girder displacement information measurement method capable of calculating rotational displacement information of PSC girders. delete delete According to claim 1,
The first tension,
Tension force of 40% to 60% of the maximum tension force that can be introduced into the first and second strands,
The second tension,
Characterized in that the tension force is 80% to 100% of the maximum tension force that can be introduced into the first and second strands,
A bridge construction method using a girder displacement information measurement method capable of calculating rotational displacement information of PSC girders. According to claim 1,
Characterized in that both ends of the first and second strands are connected to fixing units disposed at both ends of the PSC girder, respectively.
A bridge construction method using a girder displacement information measurement method capable of calculating rotational displacement information of PSC girders. A displacement measuring unit installation step of installing a displacement measuring unit including a plurality of displacement measuring devices on one side of the PSC girder;
A strand arrangement step of symmetrically arranging first and second strands at a distance from each other at the lower edge of the PSC girder, and symmetrically arranging third and fourth strands at a distance from each other at the lower edge of the PSC girder;
a first tensioning force introducing step of simultaneously introducing a first tensioning force into the first strand, the second strand, the third strand and the fourth strand;
Using a displacement measuring device disposed on one side of the PSC girder, measuring positional information including information about the bridge coordinates (X), orthogonal coordinates (Y) and vertical coordinates (Z) of the PSC girder, and the position information Calculate displacement information including bridge axis displacement, bridge axis perpendicular displacement, vertical displacement and rotational displacement of the PSC girder based on, and calculate the rotational displacement of the PSC girder based on the bridge axis displacement, the bridge axis perpendicular displacement and the vertical displacement. Transformation information calculation step of calculating ; and
A second tension introducing step of additionally introducing a second tension force to each of the first twisting line, the second twisting line, the third twisting line, and the fourth twisting line based on the deformation information;
Bridge construction method using PSC I-girder. According to claim 10,
One end of the first and second strands is connected to a first fixing unit disposed at one end of the PSC girder, and the other ends of the first and second strands are exposed to the outside of the central portion of the PSC girder. It is connected to the fourth fixing unit,
The other ends of the third and fourth strands are connected to the second anchorage portion disposed at the other end of the PSC girder, and one end of the third and fourth strands is exposed to the outside of the central portion of the PSC girder. Characterized in that it is connected to the third fixing unit,
Bridge construction method using PSC I-girder. According to claim 10,
One end and the other end of the first and second strands are respectively connected to the first anchorage part and the second anchorage part disposed at one end and the other end of the PSC girder,
Characterized in that one end and the other end of the third strand and the fourth strand are respectively connected to the third and fourth anchorages exposed to the outside of the center of the PSC girder,
Bridge construction method using PSC I-girder. According to claim 11,
The first strand, the second strand, the third strand and the fourth strand include an unattached strand,
The first anchoring unit, the second anchoring unit, the third anchoring unit, and the fourth anchoring unit include at least one pair of anchorages capable of adjusting tension,
Bridge construction method using PSC I-girder. A displacement measuring unit installation step of installing a displacement measuring unit including a plurality of displacement measuring devices on one side of the PSC girder;
A strand arrangement step of symmetrically arranging the first and second strands at a distance from each other at the lower edge of the PSC girder, and then symmetrically arranging the fifth and sixth strands at a distance from each other at the upper edge of the PSC girder;
A third tension force introduction step of simultaneously introducing a third tension force into the fifth and sixth strands;
a tension force introducing step of simultaneously introducing a tension force into the first strand and the second strand;
Using a displacement measuring device disposed on one side of the PSC girder, measuring positional information including information about the bridge coordinates (X), orthogonal coordinates (Y) and vertical coordinates (Z) of the PSC girder, and the position information Calculate displacement information including bridge axis displacement, bridge axis perpendicular displacement, vertical displacement and rotational displacement of the PSC girder based on, and calculate the rotational displacement of the PSC girder based on the bridge axis displacement, the bridge axis perpendicular displacement and the vertical displacement. Transformation information calculation step of calculating ; and
A tension control step of relaxing the magnitude of the third tension force introduced into the fifth and sixth lecture lines based on the deformation information or introducing a fourth tension force that is an additional tension force; characterized in that it comprises,
Bridge construction method using PSC I-girder. According to claim 14,
The third tension,
Characterized in that the tension of 40% to 60% of the maximum tension that can be introduced into the first and second strands,
Bridge construction method using PSC I-girder.

Images