KR101566317B1 - Flange penetrating external tendon type girder - Google Patents

Flange penetrating external tendon type girder Download PDF

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Publication number
KR101566317B1
KR101566317B1 KR1020150063971A KR20150063971A KR101566317B1 KR 101566317 B1 KR101566317 B1 KR 101566317B1 KR 1020150063971 A KR1020150063971 A KR 1020150063971A KR 20150063971 A KR20150063971 A KR 20150063971A KR 101566317 B1 KR101566317 B1 KR 101566317B1
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South Korea
Prior art keywords
girder
flange
tension member
holes
fixed
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KR1020150063971A
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Korean (ko)
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김윤기
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김윤기
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Priority to KR1020150063971A priority Critical patent/KR101566317B1/en
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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
    • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
    • 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
    • E01D2/02—Bridges characterised by the cross-section of their bearing spanning structure of the I-girder type

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

The present invention relates to a girder (10) with external tendons (20). Tendons (20) are installed in a girder (10) without a bias part (16) and a bottom of the tendons (20) is separated from a central line of the girder (10) to the fullest by anchoring the tendons (20) mounted on one end of the girder (10) in the other end of the girder (10) via the undersurface of a lower flange (11) of the girder (10) after the tendons penetrate penetration holes (13) formed on the flange (11). According to the present invention, a distance between the central line of the girder (10) and the tendons (20) installed in tensile portions of the girder (10) is expanded to the fullest, thereby acquiring a maximum reinforcement effect of the tendons (20) under the same tensile conditions.

Description

{FLANGE PENETRATING EXTERNAL TENDON TYPE GIRDER}

The present invention relates to a girder 10 provided with an outer tension member 20. A plurality of through holes 13 are formed in a lower flange 11 of a girder 10, The tension member 20 fixed on the girder 10 passes through the through hole 13 and passes through the bottom surface of the flange 11 and is fixed to the other end of the girder 10 so that a separate deflection portion 16 is installed on the girder 10 It is possible not only to install the tension member 20 but also to allow the lower end of the tension member 20 to be spaced as far as possible from the center line of the girder 10. [

The external tension applied for the reinforcement of the load-carrying capacity of the girder 10 is established by placing a tensile member 20, usually composed of a steel wire or a steel rod, outside the girder 10, tensioning the tensile member 20 The both ends of the tensile material 20 are fixed to the girder 10 and the load force of the girder 10 is strengthened by artificially applying a compressive force to the portion where tensile force acts on the girder 10 as the load is loaded do.

1 illustrates a state in which an external tension member 20 is installed on a normal girder 10 having both ends supported by flanges 11 on upper and lower ends of a web 12 The fixing portions 15 at both ends of the tensile material 20 are formed on the upper sides of both ends of the girder 10 so as to correspond to the longitudinal stress distribution of the girder 10 along the both ends, A tension member 20 whose one end is fixed to a fixing portion 15 on one side of the girder 10 is connected to the other side of the girder 10 via a lower portion of the deflecting portion 16, And fixed to the fixing unit 15.

As described above, by applying the external tension member 20 to the load-carrying capacity reinforcement of the girder 10, it is possible to improve the performance of the bridge without replacing the existing girder 10 of the old bridge. Particularly, In this difficult bridging, it is possible to increase the load-bearing capacity and ensure ease of installation. The prior art relating to reinforcement of the girder 10 through the external tension member 20 is disclosed in Japanese Patent Laid-Open No. 2006-18381.

1, the conventional outer tension member 20 mounting girder 10 including the open No. 2006-18381 is generally mounted with the deflection portion 16 to reinforce the tensile portion at the center of the girder 10 So that the lower portion of the tension member 20 via the lower side of the deflection portion 16 can not be sufficiently spaced from the centerline of the girder 10. [

That is, as can be seen from the sectional view taken along the line A-A 'in the lower part of FIG. 1, a normal girder (not shown) composed of a steel plate having a vertically plate- 10, the deflection portion 16 is formed in the shape of a bent plate attached to the web 12 of the girder 10 and the tension member 20 is installed in close contact with the bottom surface of the deflection portion 16, The deflecting portion 16 must be spaced apart from the upper surface of the lower flange 11 in order to secure the working space when the tension member 20 is installed and tensioned.

The tension member 20 passing under the deflection portion 16 can therefore not be sufficiently spaced from the centerline of the girder 10 which results in reducing the moment produced by the tensioned tension member 20, ) Is limited in the reinforcement effect.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and has an object of providing an external tension member 20 in which a linear tension member 20 is fixed at both ends of a girder 10 to which a flange 11 is bonded at a lower end of a web 12 In the girder 10, a pair of mutually spaced through-holes 13 are formed in the flange 11 and a tensile member 20 fixed to one end of the girder 10 is inserted into the pair of through-holes 13 Passes through the bottom of the flange (11), passes through the remaining one of the pair of through holes (13), and is fixed to the other end of the girder (10).

The through hole 13 is formed in a shape having a longer length in the longitudinal direction of the girder 10 than the width in the transverse direction of the girder 10 and is formed on the wall surface of the through hole 13, And the outer surface of the tensile member 20 is closely attached to the curved surface 14 with the surface 14 being formed in the outer surface of the girder 10. The through- The penetration hole 13 is formed with a longitudinally elongated shape and a coupling block 31 fixed to the girder 10 is coupled to the penetration hole 13 and exposed through the through hole 13 of the coupling block 31 And a curved surface (14) is formed on a surface of the curved surface (14) so that the outer circumferential surface of the tensile material (20) is closely attached to the curved surface (14).

A pressing member 40 protruding downward is provided on the bottom surface of the flange 11 between the pair of through holes 13. A tension member 20 passing through the bottom surface of the flange 11 between the through holes 13, The outer circumferential surface of the tensile member 20 is in close contact with the bottom surface of the pushing member 40. The pushing member 40 has a rod body embedded in the bent plate member, Wherein the plate member of the pushing member 40 is provided in a direction transverse to the mounting plate 41 and the plate member of the pushing member 40 is attached to the flange 11 in a direction crossing the mounting plate 41, And a slanting plate 42 formed with an inwardly bent release protrusion 43. The hook of the pushing mouth 40 has a curved bottom surface 45 and a neck portion 45 protruding from the upper surface of the curled top 45 And the wider portion 47 of the rod body is formed by the widened plate 42 and the widened portion 47 formed laterally at the upper end of the neck portion 46, The throat portion 46 of the tubular body accommodated therein is coupled between the separation preventing projections 43 at the lower end of the swash plate 42 so that the tension member 20 passing through the bottom surface of the flange 11 between the through holes 13 is tensioned, The inclined plate 42 is deformed while pressing the inner surface of the widened portion 42 with both side ends of the widened portion 47 as the outer peripheral surface of the widened portion 20 is brought into close contact with the bottom surface of the head 45 of the rod, Is an outer tension member flange passing type girder.

It is possible to maximally extend the distance between the center line of the girder 10 and the tensile material 20 installed on the tensile side of the girder 10 to thereby maximize the reinforcing effect under the tensile condition of the same tensile material 20. [ have.

Particularly, it is possible to install the tension member 20 without providing a separate deflection portion 16 in the girder 10, thereby making it possible to improve the convenience of the installation and reduce the construction cost. Further, the tension member 20 can be inserted into the lower through- And tightly adhered to the bottom surface of the lower flange 11, the compressive force formed by the tensile member 20 spreads widely on the bottom surface of the flange 11, so that one-layer stable and efficient reinforcement is possible.

1 shows a conventional outer tension girder structure
2 is a perspective view of the present invention
3 is a schematic view of the structure of the present invention
Figure 4 is an enlarged cross-sectional view of the through-
5 is a schematic view showing a state where the present invention is applied to a continuous beam
Figure 6 is a perspective view of an embodiment of the present invention,
Figure 7 is an enlarged cross-sectional view of the through-
8 is a schematic view of an embodiment of the present invention to which a push-
9 is a side view of an embodiment of the present invention to which a split-
Fig. 10 is a structural view of an embodiment of the present invention to which a telescopic pressing tool is applied
Fig. 11 is a perspective view of a push-

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A detailed configuration of the present invention will be described with reference to the accompanying drawings.

2 is a perspective view illustrating the outer appearance of the present invention. The present invention is characterized in that a linear tension member 20 is provided at both ends of a girder 10 to which a flange 11 is bonded at the lower end of a web 12, The tension member 20 is not bent on the side surface by the deflection portion 16 but is installed through the lower flange 11 as the outer tension member 20 mounting girder 10 to which the tension member 20 is fixed.

2 and 3, the present invention is a method of installing an external tension member 20 applied to a girder 10 having a flange 11 formed at a lower end of a vertical plate chain web 12, A through hole 13 is formed through the flange 11 so that the tension member 20 passes through the through hole 13 and passes through the bottom surface of the flange 11.

3 shows a side view of the girder 10 according to the present invention in which both ends are supported. As shown in the figure, in the case of both end support girders 10 that are not continuous beams, And the tension member 20 fixed to the fixing unit 15 formed at one end of the girder 10 passes through one of the pair of the through holes 13 to form the flange 11 Through the bottom of the pair of through-holes 13 and then fixed to the fixing unit 15 formed at the other end of the girder 10.

3, the mutually spaced apart through-holes 13 are symmetrically formed with respect to the center of the girder 10, and a tensile member having one end fixed to one fixing portion 15 of the girder 10 20 passes through the through hole 13 on the side of the fixing portion 15 from the upper surface side to the bottom surface side of the flange 11 and then passes through the bottom surface of the flange 11 between the through holes 13, And passes through the sphere 13 from the bottom surface side of the flange 11 to the top surface side and is fixed to the other side fixing portion 15 of the girder 10. [

Therefore, the flexure of the tensile member 20 is formed on the side surface without the configuration of the deflection portion 16, and the maximum compressive force is applied to the tensile side deformation section formed under the center portion of the girder 10 when the load is applied to the girder 10 In particular, since the lower end of the tensile member 20 is spaced from the center line of the girder 10 as much as possible, it is possible to effectively cope with the bending moment acting on the girder 10. [

3, the outer circumferential surface of the tensile material 20 passing through the bottom surface of the flange 11 is tightly brought into close contact with the bottom surface of the flange 11, so that a wide portion of the bottom surface of the flange 11 The pressing force by the outer tension member 20 can be uniformly distributed without being concentrated on a specific portion of the girder 10, so that the reinforcing effect can be further enhanced.

4 is a view showing a state in which a wall surface of a through hole 13 in direct contact with a tensile member 20 is curved in forming a through hole 13 in a flange 11, 20 and the wall surface of the through-hole 13 can be prevented from being damaged.

4, the through-holes 13 are formed in such a manner that the length in the longitudinal direction of the girder 10 is longer than the width in the transverse direction of the girder 10, A curved surface 14 is formed on the wall surface of the through hole 13 in which the tension member 20 is contacted and a boundary line between the surface of the flange 11 formed to be sharp and the wall surface of the through hole 13 is formed, So that the outer circumferential surface of the tensile member 20 is brought into close contact with the smooth curved surface 14.

By providing the linear tension member 20 in such a manner as to repeatedly penetrate the lower flange 11 of the web 12 without the deflection portion 16, it is possible to obtain a superior reinforcement effect compared to the prior art without the addition of the tension member 20 Such a stiffener mounting method of the present invention can be applied to a continuous beam type bridge as shown in Fig. 5, in addition to the both-end support type girders 10 as illustrated in Figs. 2 and 3. As shown in Fig. In the case of the continuous beam, the deflection portion 16 may be disposed on the upper side of the central portion to form the upwardly curved portion of the tensile member 20 at the center of the continuous beam.

6 and 7, the through-hole 13 may be formed in the through-hole 13 as shown in FIG. 6 and FIG. 7, since the pressing force of the straining material 20 can be concentrated on the corresponding portion of the through- A pressing block 40 is provided on the bottom surface of the flange 11 between the through holes 13 as shown in Figs. 8 to 11 The central portion of the tensile member 20 is separated from the bottom surface of the flange 11 to prevent direct contact between the tensile member 20 and the through hole 13 to prevent damage to the tensile member 20 as well as the girder 10. [

6 is a perspective view of an embodiment in which the coupling block 31 is applied. In the illustrated embodiment, the coupling block 31 is formed under the support plate 30 composed of the plate 32 and the plate 33, The engaging block 31 is fixed to the girder 10 in a state where the engaging block 31 is engaged with the through hole 13 as the upper and lower plates 32 and 33 are attached and fixed to the upper surface of the lower flange 11 and the side surface of the web 12, .

6 and 7, the through-hole 13 is formed so as to have a longer length in the longitudinal direction of the girder 10 than the width in the transverse direction of the girder 10, and the through- The curved surface 14 is formed on the exposed surface of the coupling block 31 in the through hole 13 so that the outer peripheral surface of the curved surface 14 is curved It is in close contact.

The urging force transmitted by the contact of the tension member 20 acts on the coupling block 31 and then the flange 32 of the coupling block 31 and the flange 33 of the girder 10, (11) and the web (12), excessive concentration of external force on a part of the through-hole (13) can be suppressed.

8 to 11 show that the pressing member 40 is disposed between the bottom surface of the flange 11 and the tensile member 20 to solve the problem of direct contact between the through hole 13 and the tensile member 20, So that the pressing force of the flange 11 can be uniformly distributed on the bottom surface of the flange 11 efficiently.

8 shows a mounting state of the single-piece pusher 40. As shown in the figure, a pushing-out port 40 protruding downward is provided on the bottom surface of the flange 11 between the pair of through- And the outer circumferential surface of the tensile member 20 is brought into close contact with the bottom surface of the pushing member 40 as the tensile member 20 passing through the bottom surface of the flange 11 between the through holes 13 is pulled.

The single-piece pushing member 40 is provided in the longitudinal direction of the girder 10, that is, in the axial direction of the tensile member 20, and the bottom portion of the pushing member 40 is curved, It is preferable to be able to distribute it uniformly throughout the entirety of the housing 40.

9 shows the mounting state of the divisional pusher 40. As shown in the figure, when the pusher 40 is mounted on the bottom of the flange 11, a plurality of divided small pushers 40 Are arranged in a row in the longitudinal direction of the girder 10 so that the upper and lower widths of the respective pushing mouths 40 are adjusted differently so that the pressing force equal distribution through the curving of the bottom of the single- So that a similar hinge effect can be obtained.

10 and 11, a plurality of pushing ports 40 are disposed between the bottom surface of the flange 11 and the tensile member 20 to solve the problem of direct contact between the through hole 13 and the tensile member 20 described above The pressing force of the tensile member 20 can be distributed evenly to the bottom surface of the flange 11 efficiently by forming the upwardly and downwardly stretched and contracted structure in the pressing mouth 40. [

10 and 11, a plurality of pushing openings 40 are provided on the bottom face of the flange 11 between the pair of through holes 13, and the pushing openings 40 are formed in the bent plate body, And the pressing force by the tension member 20 is transmitted to the pressing mouth 40 without being directly applied to the bottom face of the flange 11. In this case, 40 are slightly expanded and contracted in the upward and downward directions in response to the pressing of the tension member 20 so as to be brought into close contact with the tension member 20 irrespective of the bent shape on the side surface of the tension member 20. [

The upward and downward stretching shafts of the pushing tool 40 and thus the tightening action of the pushing tool 20 are achieved by the structure of the pushing tool 40 as shown in FIG. As the bar is pressed upward, the plate is deformed and the upper and lower widths of the entire pushing member 40 are contracted. When the press is released, the bar is lowered, So that the upper and lower widths of the entire pushing mouth 40 are elongated.

That is, as shown in the sectional view taken along the line D-D 'in FIG. 10, the plate body of the pushing member 40 is formed symmetrically with the attachment plate 41 attached to the bottom surface of the flange 11, And a slanting plate 42 formed with a release preventing tuck 43 bent inward at the lower end thereof. The hook of the pushing mouth 40 is formed with a head 45 having a curved surface at the bottom, The widened portion 47 of the bar body is accommodated between the inclined plates 42 and the neck portion 46 of the bar body is supported by the inclined plate 42 The outer circumferential surface of the tension member 20 is pressed against the bottom surface 45 of the tubular body 45 as the tension member 20 passing through the bottom surface of the flange 11 between the through holes 13 is tensioned, And the inclined plate 42 is deformed while both side ends of the wider portion 47 press the inner surface of the widened plate 42 as the rod built in the plate body rises. The tight tight contact between the writing tension member 20 and the head 45 of the pressing member 40 is always maintained and the pressing force of the tension member 20 can be distributed evenly regardless of the curved shape of the side surface of the tension member 20. [ It is.

10: Girder
11: Flange
12: web
13: Through hole
14: curved face
15:
16:
20: Tension material
30: Support plate
31: Coupling block
32: Reputation
33: Entry
40:
41: Attachment plate
42: swash plate
43:
45: Tofu
46: neck
47:

Claims (5)

An outer tension member 20 mounting girder 10 to which a linear tension member 20 is fixed at both ends of a girder 10 to which a flange 11 is bonded at the lower end of a web 12, And a tension member 20 fixed to one end of the girder 10 passes through one of the pair of through holes 13 to pass through the bottom surface of the flange 11, An outer tension member flange passing type girder which passes through the rest of the pair of through holes (13) and is fixed to the other end of the girder (10)
The through-holes 13 are formed in a shape having a longer length in the longitudinal direction of the girder 10 than the width in the transverse direction of the girder 10, thereby securing a space along the inclined passage of the tensile member 20;
The outer circumferential surface of the tensile member 20 passing through the bottom surface of the flange 11 is tightly brought into close contact with the bottom surface of the flange 11 so that a wide portion of the bottom surface of the flange 11 is strongly pressed;
Wherein a curved surface (14) is formed in the wall surface of the through hole (13) to which the tensile member (20) is contacted, so that the outer peripheral surface of the tensile member (20) is closely attached to the curved surface (14).
An outer tension member 20 mounting girder 10 to which a linear tension member 20 is fixed at both ends of a girder 10 to which a flange 11 is bonded at the lower end of a web 12, And a tension member 20 fixed to one end of the girder 10 passes through one of the pair of through holes 13 to pass through the bottom surface of the flange 11, An outer tension member flange passing type girder which passes through the rest of the pair of through holes (13) and is fixed to the other end of the girder (10)
The through-holes 13 are formed in a shape having a longer length in the longitudinal direction of the girder 10 than the width in the transverse direction of the girder 10, thereby securing a space along the inclined passage of the tensile member 20;
The outer circumferential surface of the tensile member 20 passing through the bottom surface of the flange 11 is tightly brought into close contact with the bottom surface of the flange 11 so that a wide portion of the bottom surface of the flange 11 is strongly pressed;
The through hole (13) is fitted with a coupling block (31) fixed to the girder (10);
Wherein the curved surface (14) is formed on the exposed surface in the through hole (13) of the coupling block (31) so that the outer peripheral surface of the tensile member (20) is closely attached to the curved surface (14).
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KR1020150063971A 2015-05-07 2015-05-07 Flange penetrating external tendon type girder KR101566317B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102026978B1 (en) * 2018-06-12 2019-09-30 박경원 Direct tension beam and method for constructing temporary facility using this same
KR102227426B1 (en) * 2020-09-04 2021-03-11 조재석 Girder structure with the function of enlargement of the interlinkage of the bridge

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200281077Y1 (en) * 2002-03-15 2002-07-13 최일용 A temporaty bridge for continuous type long span
KR100770701B1 (en) * 2007-01-29 2007-10-29 정한복 Reinforce structure permanet strand of loose prevention apparatus
KR101065633B1 (en) * 2010-10-05 2011-09-20 대명건설(주) Prestressed steel tubular truss beam by external prestressing method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200281077Y1 (en) * 2002-03-15 2002-07-13 최일용 A temporaty bridge for continuous type long span
KR100770701B1 (en) * 2007-01-29 2007-10-29 정한복 Reinforce structure permanet strand of loose prevention apparatus
KR101065633B1 (en) * 2010-10-05 2011-09-20 대명건설(주) Prestressed steel tubular truss beam by external prestressing method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102026978B1 (en) * 2018-06-12 2019-09-30 박경원 Direct tension beam and method for constructing temporary facility using this same
KR102227426B1 (en) * 2020-09-04 2021-03-11 조재석 Girder structure with the function of enlargement of the interlinkage of the bridge

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