KR101727387B1 - Deviation Saddle for Forming Elliptic Duct and Manufacturing Method thereof - Google Patents

Deviation Saddle for Forming Elliptic Duct and Manufacturing Method thereof Download PDF

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KR101727387B1
KR101727387B1 KR1020150099886A KR20150099886A KR101727387B1 KR 101727387 B1 KR101727387 B1 KR 101727387B1 KR 1020150099886 A KR1020150099886 A KR 1020150099886A KR 20150099886 A KR20150099886 A KR 20150099886A KR 101727387 B1 KR101727387 B1 KR 101727387B1
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South Korea
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duct
radius
conversion block
direction conversion
tangent angle
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KR1020150099886A
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Korean (ko)
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KR20170008560A (en
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연정흠
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인하대학교 산학협력단
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type

Abstract

A direction conversion block in which an elliptical duct is formed, and a manufacturing method thereof are presented. A method of manufacturing a direction conversion block in which a duct through which a tension member or a cable passes is formed in a saddle portion of a prestressed (PS) concrete box girder or a direction conversion block of a cable- Determining a radius of the circular duct and a radius of the uniformly distributed tangent to a predetermined reference tangent angle; Determining a length of the short axis of the ellipse with respect to the radius of the circular duct and the radius of the uniformly distributed force with respect to the reference tangent angle; Determining a difference between a longitudinal length of the direction converting block and a height difference of the duct with respect to a length of the short axis of the ellipse and a tangent angle of the lead portion and a tangent angle of the inserting portion and determining a difference in height between the fixing bar and the additional reinforcing bars, Determining a size of the direction conversion block by using the direction conversion block; Bending a steel pipe or a sheath in the shape of the ellipse so as to satisfy a length of the direction conversion block and a height difference of the duct and installing the steel pipe or sheath in a mold of the direction conversion block together with the reinforcement; And casting the concrete to form an elliptical duct.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a direction changing block for forming an elliptical duct,

The following embodiments relate to a direction conversion block in which an elliptical duct is formed and a method of manufacturing the same. More particularly, the present invention relates to a direction conversion block in which an elliptical duct for installing an elliptical duct is formed in a direction conversion block, and a method of manufacturing the same.

Deviation saddles are used in external prestressing and in fixtures of cable-stayed bridge pylons and cables for directional changes of tendons or cables.

1 is a view schematically showing a direction conversion block of a PS concrete box girder according to an embodiment.

As shown in FIG. 1, the shape of the direction conversion block 13, 14 of the PS concrete box girder 11 in which the outer tension member 12 is disposed can be shown. The direction conversion block may be formed with a duct of a direction conversion block, which is a hole through which the tension member passes.

2 is a view showing a direction conversion block to which a conventional circular duct is applied.

Referring to FIG. 2, an existing direction conversion block installed at a junction between a web and a flange of a box girder section and having a circular duct may be used. The duct of the direction conversion block, which is the hole through which the tension will pass, is a steel tube or sheath 22 bent in the form of an arc which is part of a circle according to the drawing angle 26 and the insertion angle 27 It is installed in the formwork of the direction conversion block in advance and is made by pouring concrete.

The distribution of the unit length pull-out force acting on a circular duct is maximum at a tangential angle of 0 degrees and decreases rapidly when the angle of transformation of the tension member increases beyond 10 degrees. As a result, when the orientation angle of the tension member is relatively large, the direction conversion block in which the circular duct is used must be designed in a large size inefficiently.

Korean Patent Laid-open Publication No. 10-2013-0095713 [Patent Document 1] relates to a duct-type installation method of a direction conversion block in which a uniform distribution force is applied, To a method of installing ducts of varying shapes.

The direction conversion block manufactured by this method can reduce the size of the direction conversion block using the rounded duct considerably as the direction conversion angle is increased to the optimized size. However, in the installation of ducts with uniform distribution, the complexity of calculating the curvature and the location of the tensions due to each curvature must be applied according to the tangent angle change of the tension member, which requires a lot of time and cost to manufacture the duct.

Korean Patent Laid-open Publication No. 10-2013-0047720 [Patent Document 2] relates to a method of fixing a cable girder by arranging such a cross-section of a concrete curved box cross-section, To a method of fixing a girder of a cable in a concrete box girder.

1. Korean Patent Publication No. 10-2013-0095713 2. Korean Patent Publication No. 10-2013-0047720

The embodiments describe a direction conversion block in which an elliptic duct is formed and a method of manufacturing the same. More specifically, a prestressed concrete box girder is placed on a box-shaped cross-section or outside a plan. The present invention provides a technique for a deviation saddle in which an elliptical duct is formed to convert the direction of a tension in an external prestressing method.

Embodiments provide a method and apparatus for forming an elliptical duct in a direction conversion block so that the efficiency of the duct in which the equalization pull-out force acts in the direction conversion block and the direction in which the elliptical duct is formed And a method for fabricating the same.

A direction conversion block in which a duct through which a tension member or a cable passes is formed in a saddle portion of a prestressed (PS) concrete box girder according to an embodiment or a direction conversion block of a cable- A method of making, the method comprising: determining a radius of a circular duct and a radius of an equiangular spouting force to a predetermined reference tangent angle; Determining a length of the short axis of the ellipse with respect to the radius of the circular duct and the radius of the uniformly distributed force with respect to the reference tangent angle; Determining a difference between a longitudinal length of the direction converting block and a height difference of the duct with respect to a length of the short axis of the ellipse and a tangent angle of the lead portion and a tangent angle of the inserting portion and determining a difference in height between the fixing bar and the additional reinforcing bars, Determining a size of the direction conversion block by using the direction conversion block; Bending a steel pipe or a sheath in the shape of the ellipse so as to satisfy a length of the direction conversion block and a height difference of the duct and installing the steel pipe or sheath in a mold of the direction conversion block together with the reinforcement; And creating an elliptical duct by pouring the concrete.

After the curing of the direction conversion block, the step of inserting the tension member or cable into the inserting portion of the elliptical duct and pulling the tension member or cable from the lead portion to introduce a direction changing force or pulling force into the direction changing block .

The step of determining the radius of the circular duct and the radius of the uniformly distributed tangential line with respect to the predetermined reference tangent angle may be performed by calculating a radius of the circular duct and a radius of the uniformly distributed pulling force with respect to the reference tangent angle, Can be determined.

[Equation 1]

Figure 112015068090812-pat00001

Wherein the step of determining the short axis short length of the ellipse with respect to the radius of the circular duct and the radius of the equi-distributed tractive force with respect to the reference tangent angle is performed on the basis of the radius of the circular duct and the radius of the uniform- The length of the short axis of the ellipse can be determined by Equation 2 for Equation 2 or Equation 3 for a reference tangent angle of 30 degrees.

&Quot; (2) "

Figure 112015068090812-pat00002

&Quot; (3) "

Figure 112015068090812-pat00003

Wherein the step of determining the size of the direction conversion block comprises the steps of: determining a difference between a longitudinal length of the direction conversion block and a height of the duct with respect to a length of the short axis of the ellipse, a tangent angle of the lead portion, . ≪ / RTI >

&Quot; (5) "

Figure 112015068090812-pat00004

A direction change block in which an elliptical duct according to another embodiment is formed, comprising: a direction conversion block of a prestressed (PS) concrete box girder; And an elliptic duct formed in the direction conversion block and through which a tension member or a cable passes, wherein the elliptical duct determines a radius of the circular duct and a radius of an equi-distributed pulling force with respect to a predetermined reference tangent angle, Wherein the direction conversion block determines the length of the short axis of the ellipse with respect to the radius of the duct and the radius of the uniform distribution of tangent to the reference tangent angle, And the size of the direction conversion block is determined by using at least one of the fixing reinforcement and the reinforcement roots and the thickness of the covering reinforcement.

According to embodiments, in an external prestressing method in which a tension applied to a prestressed concrete box girder is disposed outside a box-shaped cross-section or a plan, an elliptical duct for converting the direction of the tension duct may be provided with a deviation saddle.

According to embodiments, an elliptical duct is formed in the direction conversion block, thereby forming an elliptical duct for maintaining the efficiency of the duct in which the pull-out force acts in the direction conversion block and the manufacturing convenience of using the circular duct to the maximum And a method of manufacturing the same.

1 is a view schematically showing a direction conversion block of a PS concrete box girder according to an embodiment.
2 is a view showing a direction conversion block to which a conventional circular duct is applied.
3 is a view for explaining the equilibrium condition of the unit length force of the concrete section and the friction loss due to the directional change of the tension force.
FIG. 4 is a view for explaining a tangential angle of an elliptical characteristic and a geometric shape of an ellipse according to an embodiment.
FIG. 5 is a diagram showing a change in the curvature friction coefficient of a ratio to a circular radius of an elliptical short axis length according to an embodiment. FIG.
6 is a view for explaining the size and the unit length pulling force ratio of the direction conversion block in which the elliptical duct according to the embodiment is formed.
FIG. 7 is a view for explaining a ratio of a unit length of a directional conversion block to an allowable pulling force of an elliptical duct according to an embodiment.
8 is a view for explaining the effect of decreasing the length of the direction conversion block according to the increase of the tangent angle of the lead-out portion and the tangent angle of the insert portion of the direction change block in which the elliptical duct is formed according to the embodiment.
9 is a view for explaining the effect of reducing the tangent angle of the lead-out portion of the direction conversion block in which the elliptic duct is formed and the height difference of the duct according to the increase of the tangent angle of the insertion portion.
10 is a flowchart illustrating a method of manufacturing a direction conversion block in which an elliptical duct is formed according to an embodiment.

Hereinafter, embodiments will be described with reference to the accompanying drawings. However, the embodiments described may be modified in various other forms, and the scope of the present invention is not limited by the embodiments described below. In addition, various embodiments are provided to more fully describe the present invention to those skilled in the art. The shape and size of elements in the drawings may be exaggerated for clarity.

Embodiments relate to a method and apparatus for converting a prestressed concrete box girder into a directional block to convert the direction of the tension in an external prestressing method wherein the tension applied to the girder of a box- saddle ducts. More particularly, it relates to an elliptic duct of a direction conversion block that can efficiently produce a unit length draw force more easily than a conventional circular duct while making it easier to manufacture than a conventional duct for a pull-out force of a direction conversion block. .

That is, embodiments relate to a direction conversion block and a method of manufacturing the direction conversion block in which an elliptical duct is formed to maximize the efficiency of the duct in which the uniform distribution of force is exerted in the direction conversion block and the ease of manufacturing the circular duct.

3 is a view for explaining the equilibrium condition of the unit length force of the concrete section and the friction loss due to the directional change of the tension force.

Referring to FIG. 3, equilibrium conditions of a unit length of a concrete section and a frictional loss due to a direction change of a tension force are shown, and a calculation formula thereof is shown. In the arbitrary curvature radius 30 and the tangent angle 31, The normal force 32 and the frictional force 33 generated in the duct by the direction change of the tension member derived in Patent Document 2 and the pulling force 34 generated in the concrete block due to the normal force 32 and the frictional force 33 ) And the horizontal force 35 can be obtained. In general, since the direction conversion block is relatively short in length, loss due to the wave friction coefficient (K) is not considered, and only the curvature friction coefficient (51, μ) is considered.

The vertical direction unit length pulling force 34 by the existing circular duct having the constant radius of curvature 21 shown in FIG. 2 can be calculated from the following formula (1) derived from the unit length force force induction formula shown in FIG. 3 , The distribution of the unit length pulling force ratio with respect to the tangent angle can be expressed as shown in FIG. Here, [Expression 1] will be described in detail below.

Referring to FIG. 7, the difference in the distribution of the unit length draw-off force 34 in the round duct having the tangential angle 31 less than 10 degrees is not a big problem in application of the circular duct within 10%. However, if the change in the tangential angle 31 greater than 10 degrees and particularly the tangential angle 27 of the insertion portion is small and the tangent angle 26 of the withdrawal portion is large, the maximum unit length pulling force The directional conversion block of the circular duct designed by the user is designed to be inefficient.

In order to solve such a problem, in Patent Literature 1, a duct is provided so as to have a curvature radius with respect to each tangent angle 26 from a curvature radius formula for an equally divided pullout force of Equation (1) A direction conversion block can be designed. However, in order to create a duct in which the uniformly distributed force is applied, a complicated expression of the coordinates calculated by the integral of the curvature radius equation must be calculated, and it takes a lot of time and cost to produce an accurate duct shape.

Embodiments are intended to maximize the merits of the advantages and disadvantages of the conventional direction conversion block as described above, and it is an object of the present invention to apply a elliptical duct to a direction conversion block to facilitate the installation of a duct while showing a distribution of a pulling force similar to a uniform distribution .

In order to apply the elliptical duct to the direction conversion block, the vertical draw-out force acting on the direction conversion block and the size of the short axis with respect to the ellipse should be determined. Here, the vertical pulling force 25 is shown in Fig. And the size of the short axis relative to the ellipse will be described below with reference to FIG.

FIG. 4 is a view for explaining a tangential angle of an elliptical characteristic and a geometric shape of an ellipse according to an embodiment.

Referring to FIG. 4, a formula for the tangential angle of the elliptical geometry and the elliptical characteristic can be expressed. In order to determine the size (43, 44) of the short axis for the ellipse, determine the size (43, 44) of the short axis of the elliptical duct required for the direction conversion block from the elliptic curvature radius equation and the curvature radius equation of Equation .

The geometric shapes of the ellipses, the formulas of the ellipses, the slope of the tangent angles, and the normals and curvature radii can be represented as shown in FIG. The radius of curvature of the ellipse relative to the tangential angle 31 is 0 and the radius of curvature 21 of the circle tangent at this point is the radius of curvature of the long axis 43 May be a value obtained by dividing the square by the shortening length 44.

The radius 21 and the arbitrary reference tangent angle 52 required for the circular duct with respect to the tangential angle 26 and the tangential force 23 and the curvature friction coefficient 51 and the permissible unit length withdrawal force given to the design of the direction conversion block, The radius of curvature can be calculated as the equilibrium pulling force curvature radius of Equation (1).

When the curvature radius for the arbitrary reference tangential angle 52 is substituted into the curvature radius equation, the short axis length 44 of the ellipse can be calculated as shown in Equation (2). Here, the elliptical long axis length 43 can be calculated from the relationship between the radius of curvature of the circle tangent to the ellipse and the short axis length 43,44 of the ellipse at the tangential angle 31 of 0 degrees. Here, [Expression 2] will be described in detail below.

FIG. 5 is a diagram showing a change in the curvature friction coefficient of a ratio to a circular radius of an elliptical short axis length according to an embodiment. FIG.

Referring to FIG. 5, a change in the ratio of the ratio of the basic tangent angle 52 to the circular radius of the elliptical short axis length 44 at 30 degrees is represented by a curvature friction coefficient 51, 52) is the ratio of the shortening length 44 to the radius of the circular duct (or the radius of curvature of the circular duct, 21) at 30 degrees. The ratio of the uniaxial length 44 to the range of 0.05 to 0.30 of the generally applied curvature friction coefficient 51 may be in the form of a straight line. 5, the maximum error for the short axis length 44 calculated by the simple linear equation with respect to the curvature friction coefficient 51 of the formula (3) is less than 0.3% for the formula (2).

When the lengths 43 and 44 of the short axis of the ellipse are determined as described above, the ratio of the unit length pulling force 34 acting on the elliptical duct 63 to the allowable unit length pulling force is calculated by multiplying the elliptic curvature radius formula of FIG. (4) derived by substituting the unit length pulling force (34) of the equation (1) into the equation (34). Further, the coordinate expression of the ellipse for determining the size of the direction conversion block 60 to which the elliptical duct 63 is applied can be calculated from the following expression (5) derived from the slope formula of FIG.

From the above derived equations, the tangential angle 26, the tension 23 and the curvature friction coefficient 51 of the lead portion and the elliptical duct 63 of the direction conversion block 60 required for the allowable unit length pull- . ≪ / RTI >

That is, the radius of curvature of the ellipse can be obtained from the radius of curvature 21 of the circular duct and the arbitrary reference tangent angle 52 calculated from the equation (1), and the radius of curvature of the ellipse can be obtained by using the equation (2) The lengths 43 and 44 of the shortened elliptical short axis can be calculated. Further, the coordinates can be obtained from the arbitrary tangent angle 31 with respect to the center of the ellipse calculated by the equation (5).

A method of manufacturing the direction conversion block in which the elliptical duct is formed will be described in detail below.

10 is a flowchart illustrating a method of manufacturing a direction conversion block in which an elliptical duct is formed according to an embodiment. A method of fabricating a direction conversion block in which an elliptical duct according to an embodiment is formed may be more specifically described with reference to FIGS. 2 to 6. FIG.

In step 110, a direction conversion block of a prestressed (PS) concrete box girder or a saddle portion of a cable bridge sill to form a duct through which a tension member or a cable passes is formed. It is possible to determine the radius of the circular duct and the radius of the uniformly distributed pulling force with respect to the predetermined reference tangent angle.

In other words, the tangential angle 26, the tangential force 23, the curvature friction coefficient 51 and the allowable unit length pulling force of the lead portion given as design conditions are applied to the following formula (1) The radius of curvature, that is, the radius of curvature 21 of the circular duct, can be determined.

Figure 112015068090812-pat00005

The unit length pulling force can be expressed as follows.

Figure 112015068090812-pat00006

Figure 112015068090812-pat00007

In step 120, the length of the short axis of the ellipse relative to the radius of the circular duct and the radius of the equilateral tangential to the reference tangent angle can be determined.

In other words, the short axis short lengths 43 and 44 of the ellipse can be determined from the following equation (2) for the radius of curvature 21 of the circular duct and the arbitrary reference tangent angle 52:

Figure 112015068090812-pat00008

Or, the short axis length 43, 44 of the ellipse can be determined from the following formula (3) for the reference tangential angle of 30 degrees.

Figure 112015068090812-pat00009

In step 130, the length of the short axis of the ellipse, the tangent angle of the lead portion, and the tangential angle of the insertion portion can be determined by the longitudinal length of the direction conversion block and the height difference of the duct. Further, the size of the direction conversion block can be determined by using at least one of the fixing rods and the reinforcement roots and the covering thickness.

In other words, by using the following equation (5) for the lengths 43 and 44 of the short axis of the ellipse and the tangent angle 26 of the lead portion and the tangent angle 27 of the insertion portion, 53 and the height difference 54 of the duct are determined and the size of the direction conversion block can be designed in consideration of the fixing reinforcement 28 and the reinforcement 29 and thickness of the reinforcement. Here, [Equation 5] can be derived from [Equation 4].

Figure 112015068090812-pat00010

Figure 112015068090812-pat00011

In step 140, the steel pipe or sheath 22 is bent in the shape of an ellipse so as to satisfy the length of the direction conversion block and the height difference of the duct, and the steel pipe or sheath 22 is inserted into the direction conversion block Can be installed in formwork.

At step 150, the elliptical duct 63 can be made by casting concrete.

Then, at a necessary time after the curing of the direction conversion block, a tension member or cable may be inserted into the insertion portion of the elliptical duct, and a tension member or cable may be pulled at the lead portion to introduce a direction changing force or pulling force 25 into the direction changing block.

Therefore, by forming the elliptical duct in the direction conversion block, the efficiency of the duct in which the pull-out force acts in the direction conversion block and the directional change in which the elliptical duct is formed to maintain the maximum convenience of use of the circular duct are formed Block and a manufacturing method thereof.

The direction conversion block in which the elliptical duct is formed will be described in detail below.

The direction conversion block in which the elliptical duct according to another embodiment is formed may include the direction conversion block and the elliptical duct. The direction conversion block in which the elliptical duct is formed may be formed by a method of fabricating the direction conversion block in which the elliptical duct described above is formed.

The direction conversion block may be formed in a prestressed (PS) concrete box girder. The deflection block can be used for external prestressing and for changing the orientation of tendons or cables in fixtures of cable towers and cable towers.

The direction conversion block determines the difference between the longitudinal length of the direction conversion block and the height of the duct relative to the length of the short axis of the ellipse and the tangent angle of the lead portion and the tangent angle of the insertion portion, The size of the direction conversion block can be determined using one or more.

In other words, by using the following equation (5) for the lengths 43 and 44 of the short axis of the ellipse and the tangent angle 26 of the lead portion and the tangent angle 27 of the insertion portion, 53 and the height difference 54 of the duct are determined and the size of the direction conversion block can be designed in consideration of the fixing reinforcement 28 and the reinforcement 29 and thickness of the reinforcement. Here, [Equation 5] can be derived from [Equation 4].

&Quot; (4) "

Figure 112015068090812-pat00012

&Quot; (5) "

Figure 112015068090812-pat00013

An elliptical duct may be formed in the direction conversion block and a space portion may be formed through which the tension member or the cable can pass. The elliptical duct may determine the radius of the circular duct and the radius of the equilateral tangential to the predetermined reference tangent angle to determine the length of the short axis of the ellipse relative to the radius of the circular duct and the radius of the equilateral tangent to the reference tangent angle .

In other words, the tangential angle 26, the tangential force 23, the curvature friction coefficient 51 and the allowable unit length pulling force of the lead portion given as design conditions are applied to the following formula (1) The radius of curvature, that is, the radius of curvature 21 of the circular duct, can be determined.

[Equation 1]

Figure 112015068090812-pat00014

Then, the short axis short lengths 43 and 44 of the ellipse can be determined from the following equation (2) for the radius of curvature 21 of the circular duct and the arbitrary reference tangent angle 52.

&Quot; (2) "

Figure 112015068090812-pat00015

Or, the short axis length 43, 44 of the ellipse can be determined from the following formula (3) for the reference tangential angle of 30 degrees.

&Quot; (3) "

Figure 112015068090812-pat00016

Thus, in an external prestressing method in which a tension applied to a prestressed concrete box girder is disposed outside the abdomen of the box-shaped section or outside the plan, an elliptical duct for converting the direction of the tension member, A deviation saddle may be provided.

6 is a view for explaining the size and the unit length pulling force ratio of the direction conversion block in which the elliptical duct according to the embodiment is formed.

Referring to FIG. 6, it is possible to compare the size and the unit length pulling force ratio of the directional conversion block to which the conventional circular duct 68 and the elliptical duct 63 of the present embodiment are applied (the curvature friction coefficient 51 is 0.25). The curvature of friction coefficient 51 is 0.25 and the tangent angle 26 of the lead portion is 45 degrees and the tangent angle of the tangent is 27 degrees and the tangent angle of the lead portion is 26 degrees. The direction conversion block 60 in which the elliptical duct 63 according to the embodiment is formed and the direction conversion block 65 in which the conventional circular duct 68 is applied are compared.

The unit length pulling force 64 acting on the elliptical duct 63 calculated by the equation 4 is distributed evenly more than the unit length pulling force 69 acting on the circular duct 68.

FIG. 7 is a view for explaining a ratio of a unit length of a directional conversion block to an allowable pulling force of an elliptical duct according to an embodiment.

7, there is shown a comparison of the ratio of the conventional circular duct 68 along the tangential angle 31 to the allowable pullout force of the unit length pullout 34 acting on the elliptical duct 63 according to an embodiment . The ratio of the unit length pulling force 34 to the pulling force of the allowable unit length acting on the circular duct 68 and the elliptical duct 63 at each tangential angle 31 when the reference tangential angle 52 of 30 degrees is applied . The distribution of the unit length leaning force 64, which is relatively uniform in the elliptical duct 63, has the effect of reducing the size of the direction conversion block 60 to which the elliptical duct 63 is applied.

If the reference tangential angle 52 is greater than 30 degrees, the maximum unit length withdrawal force 34 at 15 degrees of tangent angle 31 may exceed 5% of the allowable unit length withdrawal force and the reference tangent angle 52 If the angle is less than 30 degrees, the efficiency is degraded when the angle division of the unit length leaning force is reduced and the angle change is large.

FIGS. 8 and 9 are views showing the relationship between the longitudinal length of the direction conversion block and the height difference of the duct, to which the elliptic duct according to the embodiment is formed, and the direction conversion block to which the duct having the unit length lean- Compared with the reduction effect.

8 is a view for explaining the effect of decreasing the length of the direction conversion block according to the increase of the tangent angle of the lead-out portion and the tangent angle of the insert portion of the direction change block in which the elliptical duct is formed according to the embodiment. 9 is a view for explaining the effect of decreasing the tangent angle of the lead portion of the direction conversion block in which the elliptical duct is formed according to the embodiment and the height difference of the duct according to the increase of the tangent angle of the insertion portion.

The change of the tangent angle 26 of the lead portion in a state where the tangent angle 27 of the insertion portion is fixed at 0 and the change of the tangent angle 27 of the insertion portion in a state where the tangent angle 26 of the lead portion is fixed at 0 As the tangent angle between the lead-out portion and the inserting portion increases, the effect of reducing the cross-sectional area of the two directional conversion blocks increases and is more sensitive to the tangent angle 26 of the lead portion than the tangent angle 27 of the inserting portion.

Further, the effect of reducing the height difference of the duct is greater than the longitudinal length 53 of the duct. Particularly, when the tangent angle 26 of the lead portion and the tangent angle 27 of the insertion portion are 45 degrees or less, the effect of reducing the size of the two-way conversion block is very similar in the range of the curvature friction coefficient of 0.05 to 0.30.

Therefore, it takes a lot of time and cost to manufacture a duct in the direction conversion block to which the duct in which the uniform distribution fuel is applied for the optimum design of Patent Document 1 is applied, while the direction in which the elliptical duct according to the present embodiment is formed The conversion block can easily determine the lengths 43 and 44 of the elliptical short axis by applying [Equation 2] or the simpler form [Equation 3], and it is easy to manufacture because the general geometric shape ellipse is applied Do.

Furthermore, the conventional circular duct 68 using only the radius 21 of the circle calculated by the formula (1) is easy to manufacture, while the unit length pulling force 34 is the tangent angle 31 The direction conversion block is excessively designed inefficiently. However, in the elliptical duct 63 according to the present embodiment, since the tangential angle 26 of the lead portion and the tangential angle 27 of the insertion portion are less than 45 degrees, the distribution of the unit length pulling force acting on the uniformly distributed pulling force is similar to that It is possible to maintain the size reduction effect like the duct in which the uniformly divided drafting force acts.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

11: PS concrete box girder (prestressed concrete box girder)
12: external tendon
13: a block type deviation saddle
14: diaphragm-type direction conversion block
20: Duct
21: radius of curvature of circular duct
22: steel tube or sheath
23: Tensile strength of drawer
24: tensile strength of the insert
25: a deviation force or a pull-out force,
26: Tangent angle of lead
27: Tangent angle of insertion
28: Fixed reinforcing bars for pulling force
29: additional reinforcement for shear friction and flexure
30: Curvature radius
31: tangent angle
32: unit length normal force
33: unit length friction force
34: Unit length pull-out force
35: unit length horizontal force
41: Horizontal coordinate axis with respect to the center of the ellipse
42: Vertical coordinate axis for the center of the ellipse
43: Length of ellipse long axis
44: length of elliptical shortening
51: Curvature friction coefficient
52: basic tangent angle
60: direction conversion block in which an elliptic duct is formed
61: longitudinal length of elliptical duct
62: Vertical height of elliptical duct
63: Oval duct
64: Distribution of unit length pullout ratio acting on elliptical duct
65: Direction conversion block with circular duct
66: longitudinal length of circular duct
67: Vertical height of round duct
68: Circular duct
69: Distribution of the pulling force ratio acting on the circular duct

Claims (6)

A method of manufacturing a direction conversion block in which a duct through which a tension member or a cable passes is formed in a saddle portion of a prestressed (PS) concrete box girder or a direction conversion block of a cable- ,
Determining a radius of the circular duct and a radius of the uniformly distributed tangent to a predetermined reference tangent angle;
Determining a length of the short axis of the ellipse with respect to the radius of the circular duct and the radius of the uniformly distributed force with respect to the reference tangent angle;
Determining a difference between a longitudinal length of the direction converting block and a height difference of the duct with respect to a length of the short axis of the ellipse and a tangent angle of the lead portion and a tangent angle of the inserting portion and determining a difference in height between the fixing bar and the additional reinforcing bars, Determining a size of the direction conversion block by using the direction conversion block;
Bending a steel pipe or a sheath in the shape of the ellipse so as to satisfy a length of the direction conversion block and a height difference of the duct and installing the steel pipe or sheath in a mold of the direction conversion block together with the reinforcement; And
Steps to make an elliptical duct by pouring concrete
Wherein the duct is formed by a plurality of ducts. The method according to claim 1,
Inserting the tension member or cable into the inserting portion of the elliptical duct after curing of the direction changing block and introducing a direction changing force or pulling force into the direction changing block by pulling the tension member or cable from the drawing portion
Wherein the duct is formed in the duct. The method according to claim 1,
Wherein the step of determining the radius of the circular duct and the radius of the uniformly distributed tangential to the predetermined reference tangent angle comprises:
The radius of the circular duct and the radius of the uniformly distributed tension with respect to the reference tangent angle are determined by applying the following equation (1)
[Equation 1]
Figure 112015068090812-pat00017

Wherein the duct is formed in a shape of a rectangular parallelepiped. The method of claim 3,
Wherein the step of determining the short axis length of the ellipse with respect to the radius of the circular duct and the radius of the uniformly distributed pulling force with respect to the reference tangent angle,
Determining a short axis length of the ellipse according to Equation (3) for the radius of the circular duct and the radius of the uniform tangential force with respect to the reference tangent angle with respect to the following equation (2) or the reference tangent angle of 30 degrees,
&Quot; (2) "
Figure 112015068090812-pat00018

&Quot; (3) "
Figure 112015068090812-pat00019

Wherein the duct is formed in a shape of a rectangular parallelepiped. 5. The method of claim 4,
Wherein the step of determining the size of the direction-
Determining the difference between the longitudinal length of the direction conversion block and the height of the duct with respect to the length of the short axis of the ellipse, the tangent angle of the lead portion, and the tangent angle of the insertion portion, using the following equation (5)
&Quot; (5) "
Figure 112015068090812-pat00020

Wherein the duct is formed in a shape of a rectangular parallelepiped. External prestressing and the pylons of cable-stayed bridge pylons and cable fixtures are used for directional conversion of tendons or cables; And
An elliptical duct formed in the direction conversion block and through which a tension member or a cable passes,
Lt; / RTI >
The oval-
Determining a radius of the circular duct and a short axis length of the ellipse with respect to a radius of the uniform tangential force with respect to the reference tangent angle by determining a radius of the circular duct and a uniform reference tangent angle with respect to a predetermined reference tangent angle,
The direction conversion block includes:
Determining a difference between a longitudinal length of the direction converting block and a height difference of the duct with respect to a length of the short axis of the ellipse and a tangent angle of the lead portion and a tangent angle of the inserting portion and determining a difference in height between the fixing bar and the additional reinforcing bars, To determine the size of the direction conversion block
Wherein the elliptic duct is formed in the shape of a circle.
KR1020150099886A 2015-07-14 2015-07-14 Deviation Saddle for Forming Elliptic Duct and Manufacturing Method thereof KR101727387B1 (en)

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JP3829069B2 (en) 2001-05-09 2006-10-04 東京製綱株式会社 Top saddle structure of bridges and top saddle construction method for bridges
JP4663563B2 (en) 2006-03-22 2011-04-06 独立行政法人鉄道建設・運輸施設整備支援機構 Saddle structure for bridge

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KR101468302B1 (en) 2013-04-19 2014-12-02 인하대학교 산학협력단 Girder Anchorage Method by Placing Cable througth Concrete Curved Box Section
KR101508837B1 (en) 2013-08-09 2015-04-06 인하대학교 산학협력단 Duct Configuring Method of Deviation Saddle Acting Constant Pull-Out Force

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3829069B2 (en) 2001-05-09 2006-10-04 東京製綱株式会社 Top saddle structure of bridges and top saddle construction method for bridges
JP4663563B2 (en) 2006-03-22 2011-04-06 独立行政法人鉄道建設・運輸施設整備支援機構 Saddle structure for bridge

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