WO2003100173A1 - Temporary bracket for precast concrete beam bridge and the installation method using the same - Google Patents

Temporary bracket for precast concrete beam bridge and the installation method using the same Download PDF

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Publication number
WO2003100173A1
WO2003100173A1 PCT/KR2003/001023 KR0301023W WO03100173A1 WO 2003100173 A1 WO2003100173 A1 WO 2003100173A1 KR 0301023 W KR0301023 W KR 0301023W WO 03100173 A1 WO03100173 A1 WO 03100173A1
Authority
WO
WIPO (PCT)
Prior art keywords
fixing
support members
bracket structure
temporary bracket
section
Prior art date
Application number
PCT/KR2003/001023
Other languages
French (fr)
Inventor
Sang-Sik Lee
Original Assignee
Sang-Sik Lee
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR2020020016055U external-priority patent/KR200285860Y1/en
Application filed by Sang-Sik Lee filed Critical Sang-Sik Lee
Priority to JP2004507608A priority Critical patent/JP3897310B2/en
Priority to AU2003241847A priority patent/AU2003241847A1/en
Publication of WO2003100173A1 publication Critical patent/WO2003100173A1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges

Definitions

  • the present invention relates to a temporary bracket structure for PRECAST Concrete (PC) beams and an installation method thereof .
  • the temporary bracket structure for PC beam bridges of the invention can be assembled over PC beams and then completed in lower portions of PC beams through simple assembly and installation in order to relieve a worker from a risk of working at height.
  • an installation method for slab pouring in the top of a constructed pier is selected in view of various synthetic factors such as bridge type, topography at site, construction height, traffic condition under the bridge, construction period and construction cost.
  • the puncheon process installs temporary piers to support girders between piers which are previously constructed, installs puncheons by using system supports on the ground under the piers, and then installs a mold on the puncheons to allow slab concrete pouring.
  • the wood puncheon process uses wood puncheons on the piers.
  • the movable scaffold process uses automated staging and a mold to work one span at a time .
  • the puncheon process installing the puncheons on the ground under the piers has drawbacks in that materials and man powers are increased in proportion to the height of temporary work and a clearance should be ensured as an installation space. It is necessary to ensure a working space for workers in addition to installation of the puncheons and the mold, in which scaffolding is previously carried out to install foot rests or safety nets by connecting wires to portions of steel reinforcements projected from an upper portion of the girders, lowering the wires along lateral portions of the girder, and tying single-tube pipes with the wires.
  • the wood puncheon process is carried out by installing worktables and slab puncheons between the girders at a necessary interval and then assembling a slab mold with plywoods. Though the wood puncheons have good workability and moderate initial cost, it is required to install the wood puncheons at a narrow interval as a result of poor strength of wood. Also, the wood puncheons are readily damaged through repeated installation and disassembly resultantly to increase the cost of temporary wor .
  • the movable scaffold process can be used at various conditions regardless of clearance or ground since the puncheons are not installed from the ground.
  • the movable scaffold process requires complex installation process and large sized equipments, and thus is not applicable to temporary work for maintenance of bridges .
  • the inventor devised a "temporary bra cket s compt ure for PC beam bridges " , disclosed in Korean Registered Utility Model Serial No. 245284, which allows simple installation of puncheons, foot rests and safety nets in lower portions of PRECAST Concrete (PC) beams.
  • the temporary bracket structure is made of steel to enable economic operation and is applicable to temporary work for maintenance of bridges.
  • the temporary bracket structure for PC beam bridges can be installed only in the lower portions of the PC beams, accompanied with a risk of working at height.
  • the temporary bracket structure rarely ensures the safety of workers and also needs additional equipments for temporary work. There is therefore a need for means of solving the above problems . Disclosure of Invention
  • the present invention has been made in view of the foregoing problems and it is an object of the present invention to provide a temporary bracket structure for PC beam bridges and an installation method thereof, in which the temporary bracket structure is completed in lower portions of PC beams through simple assembly work in PC beam bridge construction, which has problems in overhead working, to simply perform slab concrete pouring and maintenance of bridges by installing puncheons, safety nets or foot rests.
  • a temporary bracket structure for PC beam bridges comprising: a pair of support members made in the form of pipes each having in a generally reversed T configuration, each of the support members including a vertical section and a horizontal section formed perpendicularly to the vertical section, wherein the vertical section includes a folded inclined section, a vertical section extended from the inclined section and a guide plate formed across the inclined and vertical sections, and the horizontal section includes coupling holes formed in the top and the bottom surfaces to be opposite to the inclined section of the vertical section; a connecting member inserted into the horizontal sections of the support members and having a plurality of fastening holes perforated vertically through the horizontal sections at predetermined intervals; and a pair of movable devices mounted respectively on the support members and the connecting member for laterally moving the support members.
  • a method of installing a temporary bracket structure for PC beam bridges comprises the following steps of: assembling the temporary bracket structure over the PC beams when a pier of a PC beam bridge is completed and the PC beams are installed on the upper portions of the pier; obliquely lowering the assembled temporary bracket structure for PC beam bridges to the bottoms of the PC beams to place it on the PC beams; and closely contacting the temporary bracket structure for PC beam bridges to the bottoms of the PC beams .
  • FIG. 1 is a front elevation view of a flag-type movable device of a temporary bracket structure for PC beam bridges according to a preferred embodiment of the invention
  • FIG. 2 is a perspective view of the flag-type movable device of the temporary bracket structure for PC beam bridges according to the invention
  • FIG. 3 illustrates an alternative to the flag-type movable device of the temporary bracket structure for PC beam bridges according to the invention, in which FIG. 3A is a perspective view thereof, FIG. 3B is a front elevation view thereof, and FIG. 3C is a plan view thereof;
  • FIG. 4 illustrates a Y-shaped movable device of the temporary bracket structure for PC beam bridges according to the invention, in which FIG. 4A is a perspective view thereof, FIG. 4B is a front elevation view thereof, and
  • FIG. 4C is a plan view thereof
  • FIG. 5 illustrates an alternative to the Y-shaped movable device of the temporary bracket structure for PC beam bridges according to the invention, in which FIG. 5A is a perspective view thereof, FIG. 5B is a front elevation view thereof, and FIG. 5C is a plan view thereof;
  • FIG. 6 illustrates a linear movable device of the temporary bracket structure for PC beam bridges according to the invention, in which FIG. 6A is a perspective view thereof, FIG. 6B is a front elevation view thereof, and
  • FIG. 6C is a plan view thereof
  • FIG. 7 illustrates a nut-type movable device of the temporary bracket structure for PC beam bridges according to the invention, in which FIG. 7A is a perspective view thereof, FIG. 7B is a front elevation view thereof, and
  • FIG. 7C is a plan view thereof
  • FIG. 8 illustrates a temporary bracket structure for
  • FIG. 8A is a perspective view thereof, and FIG. 8B is a front elevation view thereof;
  • FIG. 9 is a perspective view of PC beams on which the temporary bracket structures for PC beam bridges of the invention are mounted;
  • Fig. 10 is a front elevation view illustrating installation of a temporary bracket structure for PC beam bridges according to another alternative embodiment of the invention;
  • Fig. 11 is a plan view illustrating coupling holes in the support members of the temporary bracket structure for PC beam bridges of the invention.
  • FIGS. 1 through 8B are perspective, front elevation and plan views of temporary bracket structures for PC beam bridges 100 and 100' according to embodiments of the invention.
  • the temporary bracket structure for PC beam bridges 100 comprises a pair of support members 110 in the form of pipes each in a generally reversed T configuration.
  • Each of the support members 110 include a vertical section 111 and a horizontal section 112 formed perpendicularly to the vertical section 111.
  • the vertical section 111 includes a folded inclined section, a vertical section extended from the inclined section and a guide plate Ilia formed across the inclined and vertical sections.
  • the horizontal section 112 includes coupling holes 112a formed in the top and the bottom to be opposite to the inclined section of the vertical section 111.
  • the temporary bracket structure for PC beam bridges 100 also comprises a connecting member 130, which is inserted into the horizontal sections 112 of the support members 110 and has a plurality of fastening holes 131 perforated vertically through the horizontal sections 112 at predetermined intervals, and a pair of movable devices 140 mounted respectively on the support members 110 and the connecting member 130 for laterally moving the support members 110.
  • temporary bracket structure for PC beam bridges 100' of the invention may comprise a pair of support members 110 in the form of pipes each in a generally reversed T configuration.
  • Each of the support members 110 include a vertical section 111 and a horizontal section 112 formed perpendicularly to the vertical section 111.
  • the vertical section 111 includes a folded inclined section, a vertical section extended from the inclined section and a guide plate Ilia formed across the inclined and vertical sections.
  • the horizontal section 112 includes coupling holes 112a formed in the top and the bottom to be opposite to the inclined section of the vertical section 111.
  • the temporary bracket structure for PC beam bridges 100' also comprises two pairs of quadrangular fixing frames 120, which are arranged respectively along jointed peripheral portions of the vertical and horizontal sections 111 and 112 of the support members 111 and have coupling holes 121 perforated through upper portions of the fixing frames 120 to be opposite to the inclined sections of the support members 110 for receiving fixing pins 141b, a connecting member 130, which is inserted into the horizontal sections 112 of the support members 110 and has a plurality of fastening holes 131, and fastening pins 150 fixedly inserted through both the coupling holes 112a of the horizontal sections 112 of the support members 110 and the fastening holes 131 of the connecting member 130.
  • the latter temporary bracket structure for PC beam bridges 100 ' has a tightening effect smaller than that of the former temporary bracket structure for PC beam bridges 100, but is readily and simply installed. As a result, one of the temporary bracket structures for PC beam bridges 100 and 100' may be selectively used for installation of PC beams.
  • the connecting member 130 may make use of angular or circular pipes which are suitable for installation.
  • each of the guide plates Ilia which is arranged across the inclined and vertical sections of each of the vertical sections 111 of the support plates 110 guides the temporary bracket structure for PC beam bridges 100 to be arranged in position in the flanges of the PC beams 2 and
  • the coupling holes 112a formed in each of the horizontal sections 112 of the support members 110 may include upper holes a perforated in the
  • the coupling holes 112a of the horizontal section 112 may be selectively determined from the above holes a and b shown in FIG. 11 and other appropriate configurations.
  • vertical connecting members 130a may be extended continuously from the vertical sections 111 of the pair of support members 110, as shown in FIG. 9, in order to solve difficulties related to installation resulting from a cross beam placed between girders which cause difficulties to installation of scaffold under the girders.
  • pipe members may be installed horizontally between the vertical connecting members 130a of the pair of support members 110 to overcome difficulties related to installation. Since the vertical connecting members 130a are installed in the temporary bracket structure for PC beam bridges 100 as described above, scaffold for example may be readily installed under the girders, and after completing installation, the temporary bracket structure for PC beam bridges 100 may be readily disassembled also.
  • the vertical connecting members 130a may be selectively installed according to working conditions at sites.
  • the movable devices 140 used in the temporary bracket structure for PC beam bridges 100 of the invention is discriminated into flag-type movable devices 141, modified flag-type movable devices 141', Y-shaped movable devices 144, modified Y-shaped movable devices 144', linear movable devices 145 and nut-type movable devices 142 according to their configurations.
  • each of the flag-type movable devices 141 includes a fixing rod 141d movable vertically through the coupling holes 112a of each of the support members 110 and one of the fastening holes 131 of the connecting member 130, a fixing plate 141c, which is attached to an upper lateral portion of the fixing rod 141d and has a coupling slit 141a formed diagonally therein and a connecting hole 141e formed therein to be opposite to the top of the coupling slit 141a, and a pair of quadrangular fixing frames 120 placed at both sides of the fixing plate 141c along jointed peripheral portions of the vertical and horizontal sections 111 and 112 of each of the support members 110.
  • the fixing frames 120 have the coupling holes 121 for receiving a fixing pin 141b which is inserted through upper portions of the fixing frames 120.
  • the fixing pin 141b of the fixing frames 120 moves diagonally along the coupling slit 141a to allow lateral movement of the each support member 110.
  • the fixing plates 141c and the fixing rods 141d of the movable device 141 have a predetermined amount of self-weight like the fixing plates 141c', the fixing rods 141d and the fixing bards 144c, 144c' and 145a, which will be described later.
  • the flag-type movable device 141 and the movable devices 141' , 144, 144' and 145' which will be described later are readily moved downward while the support members 110 are also readily moved laterally .
  • the afore described flag-type movable devices 141 may be replaced by the modified flag-type movable devices 141 ' having a general configuration of a flag as shown in FIG.
  • Each of the modified flag-type movable devices 141' includes a fixing rod 141d movable vertically through the coupling holes 112a of each of the support members 110 and one of the fastening holes 131 of the connecting member 130, a fixing plate 141c', which is attached to an upper lateral portion of the fixing rod 141d and has a connecting hole 141e formed in an upper portion thereof adjacent to the fixing rod 141d and a coupling slit formed diagonally with respect to the connecting hole 141e, and a pair of quadrangular fixing frames 120 placed at both sides of the fixing plate 141c' along jointed peripheral portions of the vertical and horizontal sections 111 and 112 of each of the support members 110.
  • the quadrangular fixing frames 120a have coupling slits 122 which are formed diagonally and coupled with the coupling slits of the fixing plate 141c' via a fixing pin 141b.
  • the flag-type movable devices 141 and the modified flag-type movable devices 141' are preferred devices applicable to any sectional configurations of the PC beams 2 for general bridges in which flanges at both ends form tapered sections while maintaining an equal inclination angle.
  • the flag-type movable devices 141 and the modified flag-type movable devices 141' fixedly mount the support members 110 on the PC beams 2 more effectively and stably than the Y-shaped movable devices 144, the modified Y-shaped movable devices 144 ' , the linear movable devices 145 and the nut-type movable devices 142. As shown in FIG.
  • each of the Y-shaped movable devices 144 used in the temporary bracket structure for PC beam bridges of the invention is generally Y-shaped, and includes a fixing bar 144c and a fixing frame 144a.
  • the fixing bar 144c has connecting holes 144d perforated through upper ends and coupling holes (not shown) formed therein under the connecting holes 144d for receiving a fixing pin 144e, and is movable vertically through the coupling hole 112a of each of the support members 110 and one of the fastening holes 131 of the connecting member 5 130.
  • the fixing frame 144a is inclined through an upper incision of the fixing bar 144c, and is butted and fixed at an inclined upper end to the inclined section of the vertical section 111 of the support member 110 and is fixed at a lower end to the horizontal section 112.
  • the fixing 0 frame also has a predetermined size of through hole 144g formed at the inclined end and an elongated opening 144b formed along the longitudinal direction thereof to be coupled with the coupling hole (not shown) of the fixing bar 144c via the fixing pin 144e.
  • an installation rod (not shown) which will be described later is inserted into the connecting hole 144d of the movable device 144 and moved vertically so that the fixing bar 144c is diagonally moved along the elongated opening 144b of the fixing frame 144a in order 0 to laterally move the each support member 110.
  • the Y-shaped movable devices 144 may be replaced by the modified Y-shaped movable devices 144' as shown in FIG. 5.
  • Each of the modified Y-shaped movable devices 144' is generally Y-shaped, and includes a fixing bar 144c, which 5 has coupling holes (not shown) perforated through upper ends thereof for receiving a fixing pin 144e and is vertically movable through the coupling holes 112a of each of the support members 110 and the fastening holes 131 of the connecting member 130, a latch 144h arranged around the upper ends of the fixing bar 144c and fixed thereto via the fixing pin 144e extended through the fixing bar 144c and a fixing frame 144a' inclined through an upper incision of the fixing bar 144c.
  • the fixing frame 144a' is butted and fixed at an inclined upper end to the inclined section of the vertical section 111 of the support member 110 and is fixed at a lower end fixed to the horizontal section 112, and has a predetermined size of through hole 144g formed at the inclined end.
  • the fixing frame 144a' having the inclined upper end is fixed to the inclined section of the vertical section 111 of the each support member 110 to reinforce the vertical section 111.
  • an installation rod (not shown) , which will be described later, is inserted into the through hole 144g of the fixing frame 144a'.
  • the installation rod (not shown) is raised upward to vertically move the modified Y-shaped movable devices 144' and to laterally move the pair of support members 110.
  • the modified Y-shaped movable devices 144' facilitate insertion of the installation rod (not shown) over the former Y-shaped movable devices 144.
  • the installation rod (not shown) is hung on the latch 144h, which is arranged around the upper ends of the fixing bar 144c', to facilitate installation and disassembly of each of the Y-shaped movable device 144 ' ,
  • the latch 144h may have a shape of an arc or any other configurations on which the installation rod can be hung.
  • each of the linear movable devices As shown in FIG. 6, each of the linear movable devices
  • the fixing bar 145 includes a fixing bar 145a and a connecting rod 145d.
  • the fixing bar 145a comprises an upper plate, which has a connecting hole 145b extended through a top portion of the upper plate and a through hole 145c slantingly perforated under the connecting hole 145b, and a lower rod, which is coupled with the bottom of the upper plate and movable vertically through the coupling holes 112a of each of the support members 110 and one of the fastening holes 131 of the connecting member 130.
  • the connecting rod 145d is slantingly extended through the through hole 145c of the fixing bar 145a.
  • the connecting rod 145d is fixed at upper and lower ends, respectively, to the vertical section 111 and the horizontal section 112 of the each support member 110.
  • each of the nut-type movable devices 142 includes a fixing bar 142a, which is inserted into one of the fastening holes 131 of the connecting member 130 aligned with the coupling holes 112a -of the horizontal section 112 of each of the support members 110, a pair of quadrangular fixing frames 120 arranged along jointed peripheral portions of the vertical and horizontal sections 111 and 112 of the each support member 110, in which the fixing frames 120 have coupling holes 121 perforated through top portions of the frames 120 to be opposite to the inclined section of the each support member 110 for receiving a fixing pin 141b, and a handled nut 142b fastened between the fixing bar 142a and the each support member 110.
  • each support member 110 As the nut 142 moves laterally along the horizontal section 112 of the each support member 110, the support member 110 also moves laterally. With the nut-type movable devices also, an installation rod (not shown) is used to turn the nut 142 to laterally move the each support member 110.
  • the horizontal section 112 of the each support member 110 may be provided with threads 112b so that the handled nut 142b can be moved in a threading fashion in application of the each nut-type movable device 142.
  • each of the fixing frames 120b is formed as a single plate, the each fixing frame 120b may comprise at least one plate like in the above flag-type movable device
  • the above movable devices 141, 141', 142, 144, 144' and 145 are selectively installed according to working conditions.
  • the installation rod (not shown) in use for the temporary bracket structure for PC beam bridges 100 comprises a round rod or a steel wire having an L-shaped hook portion at one end and a handled at the other end, and is used to vertically move or turn and fix the movable devices 140 such as the flag-type movable devices, the modified flag-type movable devices, the Y-shaped movable devices, the modified Y-shaped movable devices , the linear movable devices and the nut-type movable devices.
  • FIG. 9 is a perspective view of PC beams 2 on which the temporary bracket structures for PC beam bridges 100 of the invention are mounted.
  • a mounting method of the temporary bracket structure for PC beam bridges 100 on the PC beams 2 comprises: assembling the temporary bracket structure for PC beam bridges 100 over the PC beams 2 when a pier 1 of a PC beam bridge is completed and the PC beams
  • the movable devices 140 will employ the flag-type movable devices 141.
  • the PC beams 2 are installed on the top of the pier 1 at a uniform interval and temporary installation is started to enable concrete slab pouring for an upper structure.
  • the connecting member 130 of the temporary bracket structure for PC beam bridges 100 is inserted into the horizontal sections 112 of the pair 2.
  • the fixing rods 141d of the movable devices 141 are inserted respectively through the coupling holes 112a of the horizontal sections 112 of the support members 110 aligned with the fastening holes 131 of the connecting member 130 and then the fixing pins 141b are inserted through the coupling holes 121 of the fixing frames 121 of the movable devices 141 matching the coupling slits 141a of the fixing plates 141c of the movable devices
  • the fixing pins 141b inserted into the coupling holes 121 of the fixing frames 120 and the coupling slits 141a of the fixing plates 141c are fastened with a margin that the fixing pins 141b can move vertically along the coupling slits 141a of the fixing plates 141c.
  • the fixing pins 141b of the fixing frames 120 are placed respectively in bottoms of the coupling slits 141a of the fixing plates 141c.
  • the coupling slits 141a of the fixing plates 141c move diagonally downward with respect to the fixing pins 141b. Then, the pair of support members 110 are move laterally. As a result, movement of the movable devices 141 is determined by the horizontal length of the coupling slits 141a in the fixing plates 141c, in which the length of the coupling holes 112a of the horizontal sections 112 of the support members 110 is designed according to the movement of the movable devices
  • the vertical connecting members 130a are extended from the vertical sections 111 of the pair of support members 110 of the temporary bracket structure for PC beam bridges 100, as shown in FIG. 10, in order to overcome difficulties in installation resulting from cross beams of the PC beams 2 or to facilitate diagnosis or maintenance of an existing bridge having a slab.
  • pipe members are installed horizontally between the vertical connecting members 130a, and scaffolding is placed on the pipe member to facilitate installation and disassembly of the temporary bracket structure for PC beam bridges 100 under a girder. Installation of the vertical connecting members 130a is selectively determined according to working conditions.
  • Installation rods (not shown) are inserted into the connecting holes 141e of the fixing plates 141c to diagonally lower the assembled temporary bracket structure for PC beam bridges to bottoms of the PC beams
  • the temporary bracket structure for PC beam bridges 100 is oriented perpendicularly to the PC beams 2 by using the guide plates Ilia of the support members 110.
  • the guide plates Ilia in the vertical sections 111 of the support members 110 guides the temporary bracket structure for PC beam bridges 100 to a proper position 100 while increasing contact faces between the temporary bracket structure 100 and the PC beams 2 to strengthen close contact between the temporary bracket structure 100 and the PC beams 2.
  • the guide plates Ilia function as reinforcing plates of the vertical sections 111, that is, the guide plates Ilia are formed along folded portions of the vertical and inclined sections to which load is concentrated to reinforce the folded portions of the vertical sections 111.
  • the installation rods (not shown) inserted into the connecting holes 141e of the fixing plates 141c are moved vertically or the connecting member 130 is raised or rocked to transfer the weight of the fixing plates 141c having the self-weight to the movable devices 141 so that the temporary bracket structure for PC beam bridges 100 closely contact the PC beams 2. Further, if load is applied on the connecting member 130 of the support members 100 fastened as above or a worker passes by to generate vibration, the movable devices 141 are more securely fastened to the PC beams 2 under the gravity.
  • the flat-type movable devices 141 are replaced by the modified flag-type movable devices 141' each of which includes the fixing rod 141d, the fixing plate 141c' having the connecting hole 141e formed in the upper portion thereof adjacent to the fixing rod 141d and the coupling slit formed diagonally with respect to the connecting hole 141e, and the quadrangular fixing frames 120 having the coupling slits 122 formed diagonally and coupled with the coupling slits of the fixing plate 141c' via the fixing pin 141b.
  • the installation rods (not shown) are inserted into the connecting holes 144d or 145b of the fixing bars 144c or 145a which are inserted through the coupling holes 112a of the support members 110 aligned with the two of the fastening holes 131 of the connecting member 130, and then moved vertically to move the fixing bars 144c or 145a along the elongated openings 144b of the fixing frames 144a of the Y-shaped movable devices 144 or along the connecting bars 145d of the linear movable devices 145 thereby laterally moving the pair of support members 110.
  • the installation rods may be inserted into the through holes 144g of the fixing frames 144a in installation of the Y-shaped movable devices 144.
  • Other steps of the installation method are substantially equal to those of the flag-type movable devices 141.
  • the installation rods (not shown) after inserting the installation rods (not shown) into the through holes 144g of the fixing frames 144a', the installation rods (not shown) are raised and moved vertically to laterally move the pair of support members 110 as well as to diagonally move the fixing bars 144c' along the fixing frames 144a' under the self-weight of fixing bars 144c' and the impact resulting from movement of the installation rods (not shown) . Further, the installation rods (not shown) can be hung on the latches 144h of the modified Y-shaped movable devices 144' to facilitate movement of the devices 144' and the support members 110.
  • the latches 144h may be readily used not only installation of the temporary bracket structure for PC beam bridges 100 but also disassembly thereof. Hereinafter other steps of the installation method are equal to those of the above flag-type movable devices 141. Where the nut-type movable devices 142 are used in place of the afore described movable devices 141, 141',
  • the handled nuts 142b and the fixing bars 142 are inserted through the coupling holes 112a in the horizontal sections 112 of the support members 110 aligned with two of the fastening holes 131 of the connecting members 130 considering the interval between the PC beams 2 and then the installation rods (not shown) are inserted in the coupling holes 121 of the fixing frames
  • the pair of support members 110 are assembled with the connecting members 130 over the PC beams 2 of the completed pier 1 likewise the above description in related with the temporary bracket structure for PC beam bridges 100, and then the fastening pins 150 are fixedly inserted through the coupling holes 112a of the support members 110 aligned with two of the fastening holes 131 of the connecting members 130 considering the interval between the PC beams
  • the installation rods (not shown) are inserted into the connecting holes 141e of the fixing frames 141c in the temporary bracket structure for PC beam bridges 100 ' to lower the temporary bracket structure for PC beam bridges 100' to bottoms of the PC beams 2 and to place the same in position.
  • the afore described vertical connecting members 130a can be also mounted on the temporary bracket structure for PC beam bridges 100' .
  • Other steps of the installation method are substantially equal to those of the temporary bracket structure for PC beam bridges 100.
  • the installation rods (not shown) are shortened and a lever is prepared to start operation at the piers.
  • the vertical connecting members 130a are provided to the vertical members 111
  • the temporary bracket structure for PC beam bridges 100 or 100' is disassembled from foot rests which are installed on the pipe members between the vertical connecting members 130a according to sequences reverse to those of afore described installation method .
  • the temporary bracket structure for PC beam bridges is completed in lower portions of PC beams through simple assembly work in PC beam bridge construction, which has problems in overhead working, to simply perform slab concrete pouring and maintenance of bridges by installing puncheons, safety nets or foot rests .
  • the temporary bracket structure for PC beam bridges is assembled and installed over the PC beams to remove any necessity for additional constructions for operation in lower portions of the PC beams thereby eliminating a risk of working at height and ensure safety to workers.

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  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

A temporary bracket structure for PRECAST Concrete (PC) beams and an installation method thereof. The temporary bracket structure for PC beam bridges of the invention can be assembled over PC beams and then completed in lower portions of PC beams through simple assembly and installation in order to relieve a worker from a risk of working at height. The temporary bracket structure includes a pair of support members having a generally reversed T configuration and each including a vertical section and a horizontal section, fixing frames, a connecting member and a pair of movable devices, or fixing pins. Each of the movable devices may comprise one of a flag-type device, a modified flag-type device, a Y-shaped device, a modified Y-shaped device, a linear device and a nut-type device.

Description

TEMPORARY BRACKET FOR PRECAST CONCRETE BEAM BRIDGE
AND THE INSTALLATION METHOD USING THE SAME
Technical Field
The present invention relates to a temporary bracket structure for PRECAST Concrete (PC) beams and an installation method thereof . In particular , the temporary bracket structure for PC beam bridges of the invention can be assembled over PC beams and then completed in lower portions of PC beams through simple assembly and installation in order to relieve a worker from a risk of working at height.
Background Art
Generally, in bridge construction, an installation method for slab pouring in the top of a constructed pier is selected in view of various synthetic factors such as bridge type, topography at site, construction height, traffic condition under the bridge, construction period and construction cost.
Conventional temporary work for installing an upper structure has adopted a puncheon process, a wood puncheon process or a movable scaffold process. The puncheon process installs temporary piers to support girders between piers which are previously constructed, installs puncheons by using system supports on the ground under the piers, and then installs a mold on the puncheons to allow slab concrete pouring. The wood puncheon process uses wood puncheons on the piers. The movable scaffold process uses automated staging and a mold to work one span at a time .
However, the puncheon process installing the puncheons on the ground under the piers has drawbacks in that materials and man powers are increased in proportion to the height of temporary work and a clearance should be ensured as an installation space. It is necessary to ensure a working space for workers in addition to installation of the puncheons and the mold, in which scaffolding is previously carried out to install foot rests or safety nets by connecting wires to portions of steel reinforcements projected from an upper portion of the girders, lowering the wires along lateral portions of the girder, and tying single-tube pipes with the wires.
The wood puncheon process is carried out by installing worktables and slab puncheons between the girders at a necessary interval and then assembling a slab mold with plywoods. Though the wood puncheons have good workability and moderate initial cost, it is required to install the wood puncheons at a narrow interval as a result of poor strength of wood. Also, the wood puncheons are readily damaged through repeated installation and disassembly resultantly to increase the cost of temporary wor .
Further, the movable scaffold process can be used at various conditions regardless of clearance or ground since the puncheons are not installed from the ground. However, the movable scaffold process requires complex installation process and large sized equipments, and thus is not applicable to temporary work for maintenance of bridges .
Accordingly, the inventor devised a "temporary bra cket s truct ure for PC beam bridges " , disclosed in Korean Registered Utility Model Serial No. 245284, which allows simple installation of puncheons, foot rests and safety nets in lower portions of PRECAST Concrete (PC) beams. The temporary bracket structure is made of steel to enable economic operation and is applicable to temporary work for maintenance of bridges. However, the temporary bracket structure for PC beam bridges can be installed only in the lower portions of the PC beams, accompanied with a risk of working at height. Thus, the temporary bracket structure rarely ensures the safety of workers and also needs additional equipments for temporary work. There is therefore a need for means of solving the above problems . Disclosure of Invention
Therefore, the present invention has been made in view of the foregoing problems and it is an object of the present invention to provide a temporary bracket structure for PC beam bridges and an installation method thereof, in which the temporary bracket structure is completed in lower portions of PC beams through simple assembly work in PC beam bridge construction, which has problems in overhead working, to simply perform slab concrete pouring and maintenance of bridges by installing puncheons, safety nets or foot rests.
It is another object of the present invention to provide a temporary bracket structure for PC beam bridges and an installation method thereof, in which the temporary bracket structure for PC beam bridges is assembled and installed over the PC beams to remove any necessity for additional constructions for operation in lower portions of the PC beams thereby eliminating a risk of working at height and ensuring safety to workers.
According to an aspect of the invention to obtain the above objects, there is provided a temporary bracket structure for PC beam bridges, comprising: a pair of support members made in the form of pipes each having in a generally reversed T configuration, each of the support members including a vertical section and a horizontal section formed perpendicularly to the vertical section, wherein the vertical section includes a folded inclined section, a vertical section extended from the inclined section and a guide plate formed across the inclined and vertical sections, and the horizontal section includes coupling holes formed in the top and the bottom surfaces to be opposite to the inclined section of the vertical section; a connecting member inserted into the horizontal sections of the support members and having a plurality of fastening holes perforated vertically through the horizontal sections at predetermined intervals; and a pair of movable devices mounted respectively on the support members and the connecting member for laterally moving the support members.
According to another aspect of the invention to obtain the above objects, there is also provided a method of installing a temporary bracket structure for PC beam bridges. The method comprises the following steps of: assembling the temporary bracket structure over the PC beams when a pier of a PC beam bridge is completed and the PC beams are installed on the upper portions of the pier; obliquely lowering the assembled temporary bracket structure for PC beam bridges to the bottoms of the PC beams to place it on the PC beams; and closely contacting the temporary bracket structure for PC beam bridges to the bottoms of the PC beams .
Brief Description of the Drawings
The above and other objects, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention in conjunction with the accompanying drawings, in which:
FIG. 1 is a front elevation view of a flag-type movable device of a temporary bracket structure for PC beam bridges according to a preferred embodiment of the invention; FIG. 2 is a perspective view of the flag-type movable device of the temporary bracket structure for PC beam bridges according to the invention;
FIG. 3 illustrates an alternative to the flag-type movable device of the temporary bracket structure for PC beam bridges according to the invention, in which FIG. 3A is a perspective view thereof, FIG. 3B is a front elevation view thereof, and FIG. 3C is a plan view thereof;
FIG. 4 illustrates a Y-shaped movable device of the temporary bracket structure for PC beam bridges according to the invention, in which FIG. 4A is a perspective view thereof, FIG. 4B is a front elevation view thereof, and
FIG. 4C is a plan view thereof;
FIG. 5 illustrates an alternative to the Y-shaped movable device of the temporary bracket structure for PC beam bridges according to the invention, in which FIG. 5A is a perspective view thereof, FIG. 5B is a front elevation view thereof, and FIG. 5C is a plan view thereof;
FIG. 6 illustrates a linear movable device of the temporary bracket structure for PC beam bridges according to the invention, in which FIG. 6A is a perspective view thereof, FIG. 6B is a front elevation view thereof, and
FIG. 6C is a plan view thereof;
FIG. 7 illustrates a nut-type movable device of the temporary bracket structure for PC beam bridges according to the invention, in which FIG. 7A is a perspective view thereof, FIG. 7B is a front elevation view thereof, and
FIG. 7C is a plan view thereof;
FIG. 8 illustrates a temporary bracket structure for
PC beam bridges using a fastening pin according to an alternative embodiment of the invention, in which FIG. 8A is a perspective view thereof, and FIG. 8B is a front elevation view thereof;
FIG. 9 is a perspective view of PC beams on which the temporary bracket structures for PC beam bridges of the invention are mounted; Fig. 10 is a front elevation view illustrating installation of a temporary bracket structure for PC beam bridges according to another alternative embodiment of the invention; and Fig. 11 is a plan view illustrating coupling holes in the support members of the temporary bracket structure for PC beam bridges of the invention.
Best Mode for Carrying Out the Invention Reference will now be made in detail to preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
FIGS. 1 through 8B are perspective, front elevation and plan views of temporary bracket structures for PC beam bridges 100 and 100' according to embodiments of the invention. As shown in FIGS. 1 through 7C, the temporary bracket structure for PC beam bridges 100 comprises a pair of support members 110 in the form of pipes each in a generally reversed T configuration. Each of the support members 110 include a vertical section 111 and a horizontal section 112 formed perpendicularly to the vertical section 111. The vertical section 111 includes a folded inclined section, a vertical section extended from the inclined section and a guide plate Ilia formed across the inclined and vertical sections. The horizontal section 112 includes coupling holes 112a formed in the top and the bottom to be opposite to the inclined section of the vertical section 111. The temporary bracket structure for PC beam bridges 100 also comprises a connecting member 130, which is inserted into the horizontal sections 112 of the support members 110 and has a plurality of fastening holes 131 perforated vertically through the horizontal sections 112 at predetermined intervals, and a pair of movable devices 140 mounted respectively on the support members 110 and the connecting member 130 for laterally moving the support members 110. Alternatively, as shown in FIG. 8, temporary bracket structure for PC beam bridges 100' of the invention may comprise a pair of support members 110 in the form of pipes each in a generally reversed T configuration. Each of the support members 110 include a vertical section 111 and a horizontal section 112 formed perpendicularly to the vertical section 111. The vertical section 111 includes a folded inclined section, a vertical section extended from the inclined section and a guide plate Ilia formed across the inclined and vertical sections. The horizontal section 112 includes coupling holes 112a formed in the top and the bottom to be opposite to the inclined section of the vertical section 111. The temporary bracket structure for PC beam bridges 100' also comprises two pairs of quadrangular fixing frames 120, which are arranged respectively along jointed peripheral portions of the vertical and horizontal sections 111 and 112 of the support members 111 and have coupling holes 121 perforated through upper portions of the fixing frames 120 to be opposite to the inclined sections of the support members 110 for receiving fixing pins 141b, a connecting member 130, which is inserted into the horizontal sections 112 of the support members 110 and has a plurality of fastening holes 131, and fastening pins 150 fixedly inserted through both the coupling holes 112a of the horizontal sections 112 of the support members 110 and the fastening holes 131 of the connecting member 130. The latter temporary bracket structure for PC beam bridges 100 ' has a tightening effect smaller than that of the former temporary bracket structure for PC beam bridges 100, but is readily and simply installed. As a result, one of the temporary bracket structures for PC beam bridges 100 and 100' may be selectively used for installation of PC beams. The support members 112 of the pair of support members
110 and the connecting member 130 may make use of angular or circular pipes which are suitable for installation.
Further, when two of the temporary bracket structure for PC beam bridges 100 are installed in lower flanges of PC beams 2, each of the guide plates Ilia which is arranged across the inclined and vertical sections of each of the vertical sections 111 of the support plates 110 guides the temporary bracket structure for PC beam bridges 100 to be arranged in position in the flanges of the PC beams 2 and
5 reinforces the vertical sections 111 of the temporary bracket structure for PC beam bridges' 100.
As shown in FIG. 11, the coupling holes 112a formed in each of the horizontal sections 112 of the support members 110 may include upper holes a perforated in the
10 top of' the horizontal section 112 and lower holes b perforated in the bottom thereof in a configuration different from that of the upper holes a in order to readily receive a fixing rod 141d and fixing bars 144c, 144c' and 145a of each of movable devices 141, 141', 144, 144' and
15 145, which will be described later. The coupling holes 112a of the horizontal section 112 may be selectively determined from the above holes a and b shown in FIG. 11 and other appropriate configurations.
The inclined sections of the vertical sections 111
20 of the pair of support members 110 have an inclination angle, which is variable according to the size and configuration of the PC beams.
According to the temporary bracket structure for PC beam bridges 100 and an installation method thereof of the
25 invention, in the event that falsework such as scaffolding is mounted on a bridge, vertical connecting members 130a may be extended continuously from the vertical sections 111 of the pair of support members 110, as shown in FIG. 9, in order to solve difficulties related to installation resulting from a cross beam placed between girders which cause difficulties to installation of scaffold under the girders. Also, pipe members may be installed horizontally between the vertical connecting members 130a of the pair of support members 110 to overcome difficulties related to installation. Since the vertical connecting members 130a are installed in the temporary bracket structure for PC beam bridges 100 as described above, scaffold for example may be readily installed under the girders, and after completing installation, the temporary bracket structure for PC beam bridges 100 may be readily disassembled also. In the temporary bracket structure for PC beam bridges 100, the vertical connecting members 130a may be selectively installed according to working conditions at sites. The movable devices 140 used in the temporary bracket structure for PC beam bridges 100 of the invention is discriminated into flag-type movable devices 141, modified flag-type movable devices 141', Y-shaped movable devices 144, modified Y-shaped movable devices 144', linear movable devices 145 and nut-type movable devices 142 according to their configurations.
As shown in FIGS. 1 and 2, each of the flag-type movable devices 141 includes a fixing rod 141d movable vertically through the coupling holes 112a of each of the support members 110 and one of the fastening holes 131 of the connecting member 130, a fixing plate 141c, which is attached to an upper lateral portion of the fixing rod 141d and has a coupling slit 141a formed diagonally therein and a connecting hole 141e formed therein to be opposite to the top of the coupling slit 141a, and a pair of quadrangular fixing frames 120 placed at both sides of the fixing plate 141c along jointed peripheral portions of the vertical and horizontal sections 111 and 112 of each of the support members 110. The fixing frames 120 have the coupling holes 121 for receiving a fixing pin 141b which is inserted through upper portions of the fixing frames 120. When the each flag-type movable device 141 is moved vertically, the fixing pin 141b of the fixing frames 120 moves diagonally along the coupling slit 141a to allow lateral movement of the each support member 110.
The fixing plates 141c and the fixing rods 141d of the movable device 141 have a predetermined amount of self-weight like the fixing plates 141c', the fixing rods 141d and the fixing bards 144c, 144c' and 145a, which will be described later. As a result, the flag-type movable device 141 and the movable devices 141' , 144, 144' and 145' , which will be described later are readily moved downward while the support members 110 are also readily moved laterally . The afore described flag-type movable devices 141 may be replaced by the modified flag-type movable devices 141 ' having a general configuration of a flag as shown in FIG.
3. Each of the modified flag-type movable devices 141' includes a fixing rod 141d movable vertically through the coupling holes 112a of each of the support members 110 and one of the fastening holes 131 of the connecting member 130, a fixing plate 141c', which is attached to an upper lateral portion of the fixing rod 141d and has a connecting hole 141e formed in an upper portion thereof adjacent to the fixing rod 141d and a coupling slit formed diagonally with respect to the connecting hole 141e, and a pair of quadrangular fixing frames 120 placed at both sides of the fixing plate 141c' along jointed peripheral portions of the vertical and horizontal sections 111 and 112 of each of the support members 110. The quadrangular fixing frames 120a have coupling slits 122 which are formed diagonally and coupled with the coupling slits of the fixing plate 141c' via a fixing pin 141b.
With the flag-type movable devices 141 or the modified flag-type movable devices 141 ' , when the support members 110 are closely contacted with lower portions of the flanges of the PC beams 2, an installation rod (not shown) having a hooked end, which will be described later, is insert into the connecting hole 141e of the fixing plate 141c or 141c' and then the installation rod is moved both vertically and laterally in order to closely fix the pair of support members 100 to the PC beams 2 while laterally moving the same.
The flag-type movable devices 141 and the modified flag-type movable devices 141' are preferred devices applicable to any sectional configurations of the PC beams 2 for general bridges in which flanges at both ends form tapered sections while maintaining an equal inclination angle. The flag-type movable devices 141 and the modified flag-type movable devices 141' fixedly mount the support members 110 on the PC beams 2 more effectively and stably than the Y-shaped movable devices 144, the modified Y-shaped movable devices 144 ' , the linear movable devices 145 and the nut-type movable devices 142. As shown in FIG. 4, each of the Y-shaped movable devices 144 used in the temporary bracket structure for PC beam bridges of the invention is generally Y-shaped, and includes a fixing bar 144c and a fixing frame 144a. The fixing bar 144c has connecting holes 144d perforated through upper ends and coupling holes (not shown) formed therein under the connecting holes 144d for receiving a fixing pin 144e, and is movable vertically through the coupling hole 112a of each of the support members 110 and one of the fastening holes 131 of the connecting member 5 130. The fixing frame 144a is inclined through an upper incision of the fixing bar 144c, and is butted and fixed at an inclined upper end to the inclined section of the vertical section 111 of the support member 110 and is fixed at a lower end to the horizontal section 112. The fixing 0 frame also has a predetermined size of through hole 144g formed at the inclined end and an elongated opening 144b formed along the longitudinal direction thereof to be coupled with the coupling hole (not shown) of the fixing bar 144c via the fixing pin 144e. With the Y-shaped 5 movable devices 144, an installation rod (not shown) which will be described later is inserted into the connecting hole 144d of the movable device 144 and moved vertically so that the fixing bar 144c is diagonally moved along the elongated opening 144b of the fixing frame 144a in order 0 to laterally move the each support member 110.
The Y-shaped movable devices 144 may be replaced by the modified Y-shaped movable devices 144' as shown in FIG. 5. Each of the modified Y-shaped movable devices 144' is generally Y-shaped, and includes a fixing bar 144c, which 5 has coupling holes (not shown) perforated through upper ends thereof for receiving a fixing pin 144e and is vertically movable through the coupling holes 112a of each of the support members 110 and the fastening holes 131 of the connecting member 130, a latch 144h arranged around the upper ends of the fixing bar 144c and fixed thereto via the fixing pin 144e extended through the fixing bar 144c and a fixing frame 144a' inclined through an upper incision of the fixing bar 144c. The fixing frame 144a' is butted and fixed at an inclined upper end to the inclined section of the vertical section 111 of the support member 110 and is fixed at a lower end fixed to the horizontal section 112, and has a predetermined size of through hole 144g formed at the inclined end. The fixing frame 144a' having the inclined upper end is fixed to the inclined section of the vertical section 111 of the each support member 110 to reinforce the vertical section 111. Unlike the foregoing description in association with the Y-shaped movable devices 144, with the modified Y-shaped movable devices 144 ' , an installation rod (not shown) , which will be described later, is inserted into the through hole 144g of the fixing frame 144a'. The installation rod (not shown) is raised upward to vertically move the modified Y-shaped movable devices 144' and to laterally move the pair of support members 110. The modified Y-shaped movable devices 144' facilitate insertion of the installation rod (not shown) over the former Y-shaped movable devices 144. The installation rod (not shown) is hung on the latch 144h, which is arranged around the upper ends of the fixing bar 144c', to facilitate installation and disassembly of each of the Y-shaped movable device 144 ' ,
The latch 144h may have a shape of an arc or any other configurations on which the installation rod can be hung.
As shown in FIG. 6, each of the linear movable devices
145 includes a fixing bar 145a and a connecting rod 145d. The fixing bar 145a comprises an upper plate, which has a connecting hole 145b extended through a top portion of the upper plate and a through hole 145c slantingly perforated under the connecting hole 145b, and a lower rod, which is coupled with the bottom of the upper plate and movable vertically through the coupling holes 112a of each of the support members 110 and one of the fastening holes 131 of the connecting member 130. The connecting rod 145d is slantingly extended through the through hole 145c of the fixing bar 145a. The connecting rod 145d is fixed at upper and lower ends, respectively, to the vertical section 111 and the horizontal section 112 of the each support member 110. With the linear movable devices 145, when the pair of support members 110 are closely contacted with lower portions of the flanges of the PC beams 2 as described above, an installation rod (not shown) is inserted into the connecting hole 145b and moved vertically to diagonally move the fixing bar 145a along the connecting rod 145d in order to closely fix the pair of support members 100 to the PC beams 2 while laterally moving the same.
As shown in FIG. 7, each of the nut-type movable devices 142 includes a fixing bar 142a, which is inserted into one of the fastening holes 131 of the connecting member 130 aligned with the coupling holes 112a -of the horizontal section 112 of each of the support members 110, a pair of quadrangular fixing frames 120 arranged along jointed peripheral portions of the vertical and horizontal sections 111 and 112 of the each support member 110, in which the fixing frames 120 have coupling holes 121 perforated through top portions of the frames 120 to be opposite to the inclined section of the each support member 110 for receiving a fixing pin 141b, and a handled nut 142b fastened between the fixing bar 142a and the each support member 110. As the nut 142 moves laterally along the horizontal section 112 of the each support member 110, the support member 110 also moves laterally. With the nut-type movable devices also, an installation rod (not shown) is used to turn the nut 142 to laterally move the each support member 110. The horizontal section 112 of the each support member 110 may be provided with threads 112b so that the handled nut 142b can be moved in a threading fashion in application of the each nut-type movable device 142. Though it is shown that each of the fixing frames 120b is formed as a single plate, the each fixing frame 120b may comprise at least one plate like in the above flag-type movable device
141 or the modified flag-type movable device 141' according to working conditions at sites .
In installation of the temporary bracket structure for PC beam bridges 100 in the PC beams 2, the above movable devices 141, 141', 142, 144, 144' and 145 are selectively installed according to working conditions.
The installation rod (not shown) in use for the temporary bracket structure for PC beam bridges 100 comprises a round rod or a steel wire having an L-shaped hook portion at one end and a handled at the other end, and is used to vertically move or turn and fix the movable devices 140 such as the flag-type movable devices, the modified flag-type movable devices, the Y-shaped movable devices, the modified Y-shaped movable devices , the linear movable devices and the nut-type movable devices.
FIG. 9 is a perspective view of PC beams 2 on which the temporary bracket structures for PC beam bridges 100 of the invention are mounted. A mounting method of the temporary bracket structure for PC beam bridges 100 on the PC beams 2 comprises: assembling the temporary bracket structure for PC beam bridges 100 over the PC beams 2 when a pier 1 of a PC beam bridge is completed and the PC beams
2 are installed in upper portions of the pier 1; obliquely lowering the assembled temporary bracket structure for PC beam bridges 100 to bottoms of the PC beams 2 to place the assembled temporary bracket structure for PC beam bridges
100 on the PC beams 2; and operating the movable devices
140 of the temporary bracket structure for PC beam bridges 100 to closely contact the temporary bracket structure for
PC beam bridges 100 with the bottoms of the PC beams 2.
Hereinafter a detailed embodiment of the mounting method of temporary bracket structure for PC beam bridges
100 will be described as follows, in which the movable devices 140 will employ the flag-type movable devices 141.
Upon completing the pier as a lower structure of the
PC beam bridge, the PC beams 2 are installed on the top of the pier 1 at a uniform interval and temporary installation is started to enable concrete slab pouring for an upper structure.
Over the PC beams 2 of the completed pier 2, the connecting member 130 of the temporary bracket structure for PC beam bridges 100 is inserted into the horizontal sections 112 of the pair 2. The fixing rods 141d of the movable devices 141 are inserted respectively through the coupling holes 112a of the horizontal sections 112 of the support members 110 aligned with the fastening holes 131 of the connecting member 130 and then the fixing pins 141b are inserted through the coupling holes 121 of the fixing frames 121 of the movable devices 141 matching the coupling slits 141a of the fixing plates 141c of the movable devices
141 to complete connection and fastening. Insertion positions of the fixing rods 141d of the movable devices
141 are determined based upon a proper interval of the PC beams 2, and the fixing pins 141b inserted into the coupling holes 121 of the fixing frames 120 and the coupling slits 141a of the fixing plates 141c are fastened with a margin that the fixing pins 141b can move vertically along the coupling slits 141a of the fixing plates 141c. Where the movable devices 141 are moved upward as shown in FIGS. 1 and 2, the fixing pins 141b of the fixing frames 120 are placed respectively in bottoms of the coupling slits 141a of the fixing plates 141c. As the movable devices 141 move downward, the coupling slits 141a of the fixing plates 141c move diagonally downward with respect to the fixing pins 141b. Then, the pair of support members 110 are move laterally. As a result, movement of the movable devices 141 is determined by the horizontal length of the coupling slits 141a in the fixing plates 141c, in which the length of the coupling holes 112a of the horizontal sections 112 of the support members 110 is designed according to the movement of the movable devices
141 and the interval of the fastening holes 131 of the connecting member 130 is also adjusted according to the movement thereof.
Where the temporary bracket structure for PC beam bridges 100 assembled as above is mounted on the PC beams
2, the vertical connecting members 130a are extended from the vertical sections 111 of the pair of support members 110 of the temporary bracket structure for PC beam bridges 100, as shown in FIG. 10, in order to overcome difficulties in installation resulting from cross beams of the PC beams 2 or to facilitate diagnosis or maintenance of an existing bridge having a slab. After the vertical connecting members 130a are installed in the temporary bracket structure for PC beam bridges 100, pipe members are installed horizontally between the vertical connecting members 130a, and scaffolding is placed on the pipe member to facilitate installation and disassembly of the temporary bracket structure for PC beam bridges 100 under a girder. Installation of the vertical connecting members 130a is selectively determined according to working conditions.
Installation rods (not shown) are inserted into the connecting holes 141e of the fixing plates 141c to diagonally lower the assembled temporary bracket structure for PC beam bridges to bottoms of the PC beams
2 considering the interval between the PC beams 2. The temporary bracket structure for PC beam bridges 100 is oriented perpendicularly to the PC beams 2 by using the guide plates Ilia of the support members 110. The guide plates Ilia in the vertical sections 111 of the support members 110 guides the temporary bracket structure for PC beam bridges 100 to a proper position 100 while increasing contact faces between the temporary bracket structure 100 and the PC beams 2 to strengthen close contact between the temporary bracket structure 100 and the PC beams 2. The guide plates Ilia function as reinforcing plates of the vertical sections 111, that is, the guide plates Ilia are formed along folded portions of the vertical and inclined sections to which load is concentrated to reinforce the folded portions of the vertical sections 111.
After the inclined sections of the vertical sections 111 of the support members are contacted with the flanges of the PC beams 2, the installation rods (not shown) inserted into the connecting holes 141e of the fixing plates 141c are moved vertically or the connecting member 130 is raised or rocked to transfer the weight of the fixing plates 141c having the self-weight to the movable devices 141 so that the temporary bracket structure for PC beam bridges 100 closely contact the PC beams 2. Further, if load is applied on the connecting member 130 of the support members 100 fastened as above or a worker passes by to generate vibration, the movable devices 141 are more securely fastened to the PC beams 2 under the gravity. Where the flat-type movable devices 141 are replaced by the modified flag-type movable devices 141' each of which includes the fixing rod 141d, the fixing plate 141c' having the connecting hole 141e formed in the upper portion thereof adjacent to the fixing rod 141d and the coupling slit formed diagonally with respect to the connecting hole 141e, and the quadrangular fixing frames 120 having the coupling slits 122 formed diagonally and coupled with the coupling slits of the fixing plate 141c' via the fixing pin 141b.
Where the flag-type movable devices 141 are replaced by the Y-shaped movable devices 144 or the linear movable devices 145, the installation rods (not shown) are inserted into the connecting holes 144d or 145b of the fixing bars 144c or 145a which are inserted through the coupling holes 112a of the support members 110 aligned with the two of the fastening holes 131 of the connecting member 130, and then moved vertically to move the fixing bars 144c or 145a along the elongated openings 144b of the fixing frames 144a of the Y-shaped movable devices 144 or along the connecting bars 145d of the linear movable devices 145 thereby laterally moving the pair of support members 110. The installation rods (not shown) may be inserted into the through holes 144g of the fixing frames 144a in installation of the Y-shaped movable devices 144. Other steps of the installation method are substantially equal to those of the flag-type movable devices 141.
However, in the case of using the Y-shaped movable devices 144', after inserting the installation rods (not shown) into the through holes 144g of the fixing frames 144a', the installation rods (not shown) are raised and moved vertically to laterally move the pair of support members 110 as well as to diagonally move the fixing bars 144c' along the fixing frames 144a' under the self-weight of fixing bars 144c' and the impact resulting from movement of the installation rods (not shown) . Further, the installation rods (not shown) can be hung on the latches 144h of the modified Y-shaped movable devices 144' to facilitate movement of the devices 144' and the support members 110. The latches 144h may be readily used not only installation of the temporary bracket structure for PC beam bridges 100 but also disassembly thereof. Hereinafter other steps of the installation method are equal to those of the above flag-type movable devices 141. Where the nut-type movable devices 142 are used in place of the afore described movable devices 141, 141',
144, 144' and 145, the handled nuts 142b and the fixing bars 142 are inserted through the coupling holes 112a in the horizontal sections 112 of the support members 110 aligned with two of the fastening holes 131 of the connecting members 130 considering the interval between the PC beams 2 and then the installation rods (not shown) are inserted in the coupling holes 121 of the fixing frames
141c to lower the nut-type movable devices 142 to bottoms of the PC beams 2. After removing the installation rods (not shown) out of the coupling holes 121 of the fixing frames 141c, the handled nuts 142b inserted into the support members 110 and the connecting member 130 are fastened by being turned with the installation rods (not shown) . Other steps of the installation method are substantially equal to those of the afore described flag-type movable devices 141.
Also in installation of the temporary bracket structure for PC beam bridges 100' of the invention, the pair of support members 110 are assembled with the connecting members 130 over the PC beams 2 of the completed pier 1 likewise the above description in related with the temporary bracket structure for PC beam bridges 100, and then the fastening pins 150 are fixedly inserted through the coupling holes 112a of the support members 110 aligned with two of the fastening holes 131 of the connecting members 130 considering the interval between the PC beams
2. Then, the installation rods (not shown) are inserted into the connecting holes 141e of the fixing frames 141c in the temporary bracket structure for PC beam bridges 100 ' to lower the temporary bracket structure for PC beam bridges 100' to bottoms of the PC beams 2 and to place the same in position. In this case, the afore described vertical connecting members 130a can be also mounted on the temporary bracket structure for PC beam bridges 100' . Other steps of the installation method are substantially equal to those of the temporary bracket structure for PC beam bridges 100.
In maintenance and disassembly after slabs are completed, the installation rods (not shown) are shortened and a lever is prepared to start operation at the piers. Where the vertical connecting members 130a are provided to the vertical members 111, the temporary bracket structure for PC beam bridges 100 or 100' is disassembled from foot rests which are installed on the pipe members between the vertical connecting members 130a according to sequences reverse to those of afore described installation method .
Industrial Applicability According to the temporary bracket structure for PC beam bridges and the installation method thereof of the invention as set forth above, the temporary bracket structure is completed in lower portions of PC beams through simple assembly work in PC beam bridge construction, which has problems in overhead working, to simply perform slab concrete pouring and maintenance of bridges by installing puncheons, safety nets or foot rests . The temporary bracket structure for PC beam bridges is assembled and installed over the PC beams to remove any necessity for additional constructions for operation in lower portions of the PC beams thereby eliminating a risk of working at height and ensure safety to workers.

Claims

What Is Claimed Is:
1. A temporary bracket structure for PC beam bridges comprising : a pair of support members made in the form of pipes having a generally reversed T configuration, each of the support members including a vertical section and a horizontal section formed perpendicularly to the vertical section, wherein the vertical section includes a folded inclined section, a vertical section extended from the inclined section and a guide plate formed across the inclined and vertical sections, and the horizontal section includes coupling holes formed in the top and the bottom surfaces thereof to be opposite to the inclined section of the vertical section; a connecting member inserted into the horizontal sections of the support members and having a plurality of fastening holes perforated vertically through the horizontal sections at predetermined intervals; and a pair of movable devices mounted respectively on the support members and the connecting member for laterally moving the support members .
2. The temporary bracket structure for PC beam bridges as set forth in claim 1, wherein the movable device is generally flag-shaped, and includes: a fixing rod being movable vertically through the coupling holes of each of the support members and one of the fastening holes of the connecting member, a fixing plate attached to an upper lateral portion of the fixing rod and having a coupling slit formed diagonally therein and a connecting hole formed therein to be opposite to the top of the coupling slit, and a pair of quadrangular fixing frames placed at both sides of the fixing plate along jointed peripheral portions of the vertical and horizontal sections of each of the support members and having coupling holes for receiving a fixing pin which is inserted through upper portions of the fixing frames to be opposite to the inclined section of the vertical section.
3. The temporary bracket structure for PC beam bridges as set forth in claim 1, wherein the movable device is generally flag-shaped, and includes: a fixing rod being movable vertically through the coupling holes of each of the support members and one of the fastening holes of the connecting member; a fixing plate attached to an upper lateral portion of the fixing rod and having a connecting hole formed in an upper portion thereof adjacent to the fixing rod and a coupling slit formed diagonally with respect to the connecting hole; and a pair of quadrangular fixing frames placed at both sides of the fixing plate along jointed peripheral portions of the vertical and horizontal section of each of the support members and having coupling slits which are formed diagonally and coupled with the coupling slits of the fixing plate.
4. The temporary bracket structure for PC beam bridges as set forth in claim 1, wherein the movable device is generally Y-shaped, and includes: a fixing bar having connecting holes perforated through upper ends thereof and coupling holes formed therein under the connecting holes for receiving a fixing pin, and being movable vertically through the coupling holes of each of the support members and one of the fastening holes of the connecting member; and a fixing frame inclined through an upper incision of the fixing bar, the fixing frame being butted and fixed at an inclined upper end to the inclined section of the vertical section of the support member and being fixed at a lower end to the horizontal section of the support member, and having a predetermined size of through hole formed at the inclined end and an elongated opening formed along the longitudinal direction thereof to be coupled with the coupling hole of the fixing bar.
5. The temporary bracket structure for PC beam bridges as set forth in claim 1, wherein the movable device is generally Y-shaped, and includes: a fixing bar having coupling holes perforated through upper ends thereof for receiving a fixing pin and being vertically movable through the coupling holes of each of the support members and one of the fastening holes of the connecting member; a latch arranged around the upper ends of the fixing bar and having both ends fixed to the external side of the fixing bar via the fixing pin of the fixing bar passing through the both ends; and a fixing frame inclined through an upper incision of the fixing bar, the fixing frame being butted and fixed at an inclined upper end to the inclined section of the vertical section of the support member and being fixed at a lower end fixed to the horizontal section of the support member, and having a predetermined size of through hole formed at the inclined end, and.
6. The temporary bracket structure for PC beam bridges as set forth in claim 1, wherein the movable device include s : a fixing bar having an upper plate, which has a connecting hole extended through a top portion of the upper plate and a through hole slantingly perforated under the connecting hole, and a lower rod, which is coupled with the bottom of the upper plate and movable vertically through the coupling holes of each of the support members and one of the fastening holes of the connecting member; and a connecting rod slantingly extended through the through hole of the fixing bar, the connecting rod being fixed at upper and lower ends, respectively, to the vertical section and the horizontal section of the each support member .
7. The temporary bracket structure for PC beam bridges as set forth in claim 1, further comprising threads formed around the peripheral portions of the horizontal sections having the coupling holes.
8. The temporary bracket structure for PC beam bridges as set forth in claim 1, wherein the movable device includes : a fixing bar inserted into one of the fastening holes of the connecting member aligned with the coupling holes of the horizontal section of each of the support members; a pair of quadrangular fixing frames arranged along jointed peripheral portions of the vertical and horizontal sections of the each support member and having coupling holes perforated through top portions of the frames to be opposite to the inclined section of the each support member for receiving a fixing pin; and a handled nut fastened between the fixing bar and the each support member, whereby the support member moves laterally as the nut moves laterally along the horizontal section of the each support member.
9. A temporary bracket structure for PC beam bridges comprising : a pair of pipe-like support members each having a generally reversed T configuration and including a vertical section and a horizontal section formed perpendicularly to the vertical section, wherein the vertical section has a folded inclined section, a vertical section extended from the inclined section and a guide plate formed across the inclined and vertical sections, and the horizontal section has coupling holes formed in the top and the bottom surfaces thereof to be opposite to the inclined section of the vertical section; at least two pairs of quadrangular fixing frames arranged respectively along jointed peripheral portions of the vertical and horizontal sections of the support members and having coupling holes perforated through upper portions of the fixing frames to be opposite to the inclined sections of the support members for receiving fixing pins; a connecting member inserted into the horizontal sections of the support members and having a plurality of fastening holes perforated vertically through the horizontal sections at predetermined intervals; and fastening pins fixedly inserted through both the coupling holes of the horizontal sections of the support members and the fastening holes of the connecting member.
10. The temporary bracket structure for PC beam bridges as set forth in any one of the preceding claims
1 through 9, further comprising: vertical connecting members extended continuously from the vertical sections of the pair of support members and having through holes formed in lateral portions thereof for receiving pipe members which function to connect the pair of support members to each other.
11. The temporary bracket structure for PC beam bridges as set forth in any one of the preceding claims
2 through 6 and 8, wherein the movable device is moved vertically as an installation rod having a hook inserted into the coupling holes or the through holes is moved vertically above the PC beams or as the nut is turned by hanging the hook of the installation rod on the handle of the nut .
12. A method of installing a temporary bracket structure for PC beam bridges, the method comprising the following steps of: assembling the temporary bracket structure as set forth in any one of the preceding claims 1 through 9 over the PC beams when a pier of a PC beam bridge is completed and the PC beams are installed on the upper portions of the pier; obliquely lowering the assembled temporary bracket structure for PC beam bridges to the bottoms of the PC beams to place it on the PC beams; and closely contacting the temporary bracket structure for PC beam bridges to the bottoms of the PC beams .
13. The method as set forth in claim 12, further comprising the step of: mounting the vertical connecting members as set forth in claim 10 on the temporary bracket structure for PC beam bridges.
PCT/KR2003/001023 2002-05-25 2003-05-24 Temporary bracket for precast concrete beam bridge and the installation method using the same WO2003100173A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2004507608A JP3897310B2 (en) 2002-05-25 2003-05-24 Temporary bracket for precast concrete beam bridge and its installation method
AU2003241847A AU2003241847A1 (en) 2002-05-25 2003-05-24 Temporary bracket for precast concrete beam bridge and the installation method using the same

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20-2002-0016055 2002-05-25
KR2020020016055U KR200285860Y1 (en) 2002-05-25 2002-05-25 temporary bracket for construction of precast concrete beam bridge
KR10-2002-0042213 2002-07-18
KR20020042213 2002-07-18

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108643560A (en) * 2018-07-24 2018-10-12 浙江中益建材科技有限公司 A kind of floor support plate temporary support structure
CN109268791A (en) * 2018-11-02 2019-01-25 广西武宣吉福光电科技有限公司 A kind of adjustable construction method for exempting to weld built-in fitting
CN110777664A (en) * 2019-10-31 2020-02-11 中交路桥华南工程有限公司 Cable-stayed bridge auxiliary pier beam section mounting frame and mounting method

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Publication number Priority date Publication date Assignee Title
KR200245284Y1 (en) * 2001-06-02 2001-10-29 이상식 A temporary bracket for construction of precast concrete beam bridge
KR20010098980A (en) * 2001-07-26 2001-11-08 이상식 Bracket for temporary construction work
KR20020036198A (en) * 2000-11-08 2002-05-16 이상식 A temporary bracket for construction of precast concrete beam bridge and the temporary work method using the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020036198A (en) * 2000-11-08 2002-05-16 이상식 A temporary bracket for construction of precast concrete beam bridge and the temporary work method using the same
KR200245284Y1 (en) * 2001-06-02 2001-10-29 이상식 A temporary bracket for construction of precast concrete beam bridge
KR20010098980A (en) * 2001-07-26 2001-11-08 이상식 Bracket for temporary construction work

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108643560A (en) * 2018-07-24 2018-10-12 浙江中益建材科技有限公司 A kind of floor support plate temporary support structure
CN109268791A (en) * 2018-11-02 2019-01-25 广西武宣吉福光电科技有限公司 A kind of adjustable construction method for exempting to weld built-in fitting
CN110777664A (en) * 2019-10-31 2020-02-11 中交路桥华南工程有限公司 Cable-stayed bridge auxiliary pier beam section mounting frame and mounting method

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