US3383080A - Overhang bracket - Google Patents

Overhang bracket Download PDF

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US3383080A
US3383080A US524577A US52457766A US3383080A US 3383080 A US3383080 A US 3383080A US 524577 A US524577 A US 524577A US 52457766 A US52457766 A US 52457766A US 3383080 A US3383080 A US 3383080A
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Prior art keywords
support
bracket
strut
seat
concrete
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US524577A
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James W Frisbie
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JAMES W FRISBIE
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James W. Frisbie
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
    • E04G13/06—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
    • E04G13/06—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall
    • E04G13/066—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall for overhangs
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
    • E04G17/18—Devices for suspending or anchoring form elements to girders placed in ceilings, e.g. hangers

Definitions

  • An adjustable bracket is employed to support a concrete form utilized in the construction of a bridge.
  • the form defines an overhang extending laterally from the permanent support structure of the bridge and includes a beam underlying the overhang which is laterally spaced from the permanent support.
  • the bracket extends upwardly from the support to the beam and comprises an adjustable strut formed by a pair of relatively telescoped tubes.
  • a foot on the lower end of the strut bears against the support, and an inverted channel at the upper end of the strut forms a seat which receives the beam.
  • a pivotal connection joins the seat to the strut and permits the base of the channel to be disposed in a level attitude so that the base will underlie the strut and be flush thereagainst.
  • the pivotal connection is locked when the base is properly oriented.
  • the bracket is removed after the concrete has set and may be subsequently reused with other forms, the telescoping strut and the pivotal connection permitting the bracket to be adjusted to a wide variety of vertical and horizontal dimensions.
  • This invention relates to an adjustable bracket for use in supporting concrete forms employed in the construction of buildings or bridges.
  • a building or bridge design may provide for an overhang, such as a walkway and railing ledge for a bridge, which is to be formed from poured concrete. This necessitates that a temporary form be constructed which is sufficiently stable to support the concrete, and yet is readily removable after the concrete sets.
  • the form In bridge construction, for example, where a horizontally extending I-beam is utifized as a primary support for a concrete roadway, the form is frequently fabricated from transverse joists and longitudinal wooden beams which impart rigidity to the floor of the form. The floor overlies the primary support and must necessarily project laterally outward-1y therefrom if an overhang is to be poured.
  • brackets which extend between the primary support and the beams which underlie the overhanging section.
  • brackets which extend between the primary support and the beams which underlie the overhanging section.
  • the bracket must be capable of adjustment in a manner to compensate for varying lateral distances between the beams and the primary support, and different vertical disances between the form floor and underlying support structure upon which the foot of the bracket rests.
  • the primary object of this invention to provide a bracket of the type discussed above which is adjustable such that a beam-engaging seat carried by the bracket may be properly oriented to receive the beam reregardless of the angularity of the bracket, which may vary due to variations in the aforesaid lateral and vertical dimensions of the structure.
  • FIGURE 1 is a fragmentary, side elevational view of a bridge structure under construction
  • FIG. 2 is a fragmentary, transverse sectional view of the structure shown in FIG. 1, and illustrating a slab of poured concrete of the finished bridge;
  • FIG. 3 is an enlarged elevational illustration of one of the brackets shown in FIG. 1;
  • FIG. 4 is a detail of the upper end of the bracket.
  • FIG. 5 is a sectional view taken along line 55 of FIG. 4.
  • the numeral designates an I-beam support which forms a part of a bridge structure shown fragmentarily in the drawing.
  • a concrete form is shown supported adjacent the upper flange 13 of support 10 and includes a floor 12, a plurality of transverse joists 14, and a number of lapped, longitudinal beams 16.
  • floor 12 is divided into two sections 12a and 12b which are disposed on opposite sides of the upper flange 13 of support 10.
  • Two rows of joists 14 are shown underlying respective sections 12a and 12b.
  • Beams 16 .extend beneath the joists 14 which support the outer or overhangsection 12b of the floor, a number of longitudinal joists 18 being utilized as additional support to stabilize the transverse joists 14.
  • Joists 14 and 18 may comprise 2 x 6 lumber stock, double 2 x 6s being employed to form the longitudinal joists 18.
  • Each beam 16 may comprise 3 x 12 lumber stock, attention being directed to the utilization of brackets 20 which extend between the lapped portions of beams 16 and the base fiange 22 of support 10.
  • Each bracket 20 comprises an elongated, longitudinally extensible and retractable strut 24 having a pair of relatively telescoped tubes 26 secured together by three crossbolts 28 extending through three of a series of holes 30 in tubes 26.
  • Tubes 26 are formed from square structural tubing, the lower end of the normally lowermost tube 26 being provided with a transverse tube section 32 which presents a foot that rests against and is supported by the lower flange 22 of support 10.
  • a tubular, transversely circular element 34 is rigid with the upper end of the normally uppermost tube 26 and is disposed with its longitudinal axis extending transversely of the longitudinal axis of strut 24.
  • Element 34 presents a convex, upwardly facing bearing surface 36 which is received by a socket member 38 in the form of an arcuate plate having a concave, downwardly facing surface 40 which slidably engages surface 36.
  • a pair of braces 42 secure member 38 to the base 44 of an elongated, transversely channel-shaped seat 46 having a pair of spaced, upright legs 48 integral with the base 44.
  • Seat 46 receives the lapped beams 16 and may be held against movement relative to the beams during installation of the bracket by nails driven through holes 50 in legs 48.
  • Member 38 has an elongated slot 52 therein which receives a threaded bolt or fastener 54 and provides clearance for the fastener to permit member 38 to be adjustably positioned on element 34 within limits defined by slot 52.
  • Element 34 is apertured to receive the shank of fastener 54, a nut 56 being welded to the internal surface of element 34 in alignment with the fastener receiving aperture.
  • a clearance opening 58 adjacent the upper end of the upper tube 26 permits the insertion of a threaded rod 69 into a hole 62 on the opposite side of the tube.
  • a wing nut 64 is threaded onto the projecting extremity 66 of rod 60, the opposite extremity 68 thereof being connected to a tie wire 70.
  • a bolt 72 extends upwardly between the two sections of the longitudinal joist 18 on the opposite side of support 10 from rod 60, bolt 72 being connected to tie wire 70 and held against movement under the pull 3 of the wire by a washer 74.
  • Wire 70 extends over flange 13 and between the edges of the flange and floor sections 12a and 1212, as is clear in FIG. 2.
  • FIG. 2 shows a slab 76 of concrete resting on floor sections 12a and 12b and flange 13, and formed in a manner to provide a walkway 78 and a railing ledge 80.
  • FIG. 2 shows a slab 76 of concrete resting on floor sections 12a and 12b and flange 13, and formed in a manner to provide a walkway 78 and a railing ledge 80.
  • the brackets of the instant invention are positioned in supporting relationship to beams 16 after the form is constructed and rods 60 and tie wires 70 are in place.
  • the telescoping tubes 26 permit the length of strut 24 to be adjusted such that seat 46 will reach the lapped beams 16 when foot 32 is in place against flange 22.
  • seat 46 may be pivoted about the axis of element 34 until the base 44 of the seat is disposed in a level attitude to properly receive beams 16. Tightening of fastener 54 then rigidly secures the seat to the strut, and rod 60 may be inserted through the upper tube 26 and held in place by wing nut 64.
  • the weight of the overhang to be formed when the concrete is poured therefore, is supported by strut 24 and supplemented by rod 60 to prevent drooping of the overhanging structure.
  • said lower end being provided with a foot bearing against the support and resting on said flange;
  • a seat receiving said beam and having a flat base
  • connection including an element rigid with said strut and having an outwardly facing, convex bearing surface, and a socket member rigid with said seat and receiving said surface,
  • said locking means including a fastener engageable with said element and said member.
  • said element having means threadedly receiving said fastener with the latter extending through said slot whereby, upon disengagement of the fastener and the member, the latter may be rotated on the element between limits defined by said slot.
  • said element being tubular in configuration and having a longitudinal axis extending transversely of said strut and defining the axis of swinging movement of the seat,
  • said seat being of elongated, transversely channelshaped configuration presenting said base and having a pair of spaced, normally upright legs,
  • said member comprising an arcuate plate disposed beneath said base and having a normally downwardly facing, concave surface slidably engaging the convex surface of said element.
  • said strut including a pair of relatively telescoped tubes
  • one of said extremities being coupled with said one tube with the rod extending laterally outwardly therefrom;
  • tie wire connected to the other of said extremities and secured to said structure.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Description

y 14, 1968 J. w. FRISBIE 3,383,080
OVERHANG BRACKET Filed Feb. 2, 1966 /2 H 1L 1| H H 22 INVENTOR James W. Fr/sb/e United States Patent 3,383,080 OVERHANG BRACKET James W. Frisbie, 4611 W. 66th Terrace, Prairie Village, Kans. 66208 Filed Feb. 2, 1966, Ser. No. 524,577 Claims. (Cl. 248-235) ABSTRACT OF THE DISCLOSURE An adjustable bracket is employed to support a concrete form utilized in the construction of a bridge. The form defines an overhang extending laterally from the permanent support structure of the bridge and includes a beam underlying the overhang which is laterally spaced from the permanent support. The bracket extends upwardly from the support to the beam and comprises an adjustable strut formed by a pair of relatively telescoped tubes. A foot on the lower end of the strut bears against the support, and an inverted channel at the upper end of the strut forms a seat which receives the beam. A pivotal connection joins the seat to the strut and permits the base of the channel to be disposed in a level attitude so that the base will underlie the strut and be flush thereagainst. The pivotal connection is locked when the base is properly oriented. The bracket is removed after the concrete has set and may be subsequently reused with other forms, the telescoping strut and the pivotal connection permitting the bracket to be adjusted to a wide variety of vertical and horizontal dimensions.
This invention relates to an adjustable bracket for use in supporting concrete forms employed in the construction of buildings or bridges.
In the construction art a building or bridge design may provide for an overhang, such as a walkway and railing ledge for a bridge, which is to be formed from poured concrete. This necessitates that a temporary form be constructed which is sufficiently stable to support the concrete, and yet is readily removable after the concrete sets.
In bridge construction, for example, where a horizontally extending I-beam is utifized as a primary support for a concrete roadway, the form is frequently fabricated from transverse joists and longitudinal wooden beams which impart rigidity to the floor of the form. The floor overlies the primary support and must necessarily project laterally outward-1y therefrom if an overhang is to be poured. The additional support required for the overhanging section of the form floor is provided by brackets which extend between the primary support and the beams which underlie the overhanging section.Manifestly, if the bracket is to be adaptable for repeated use in a number of projects, it must be capable of adjustment in a manner to compensate for varying lateral distances between the beams and the primary support, and different vertical disances between the form floor and underlying support structure upon which the foot of the bracket rests.
It is, therefore, the primary object of this invention to provide a bracket of the type discussed above which is adjustable such that a beam-engaging seat carried by the bracket may be properly oriented to receive the beam reregardless of the angularity of the bracket, which may vary due to variations in the aforesaid lateral and vertical dimensions of the structure.
As a corollary to the foregoing object, it is another important aim of this invention to provide such a bracket wherein the beam-engaging seat is pivotally mounted on the normally uppermost end of the strut portion of the bracket, thereby enabling the seat to be leveled to proper- 1y receive the beam notwithstanding variations in the angularity of the strut.
In the drawing:
FIGURE 1 is a fragmentary, side elevational view of a bridge structure under construction;
FIG. 2 is a fragmentary, transverse sectional view of the structure shown in FIG. 1, and illustrating a slab of poured concrete of the finished bridge;
FIG. 3 is an enlarged elevational illustration of one of the brackets shown in FIG. 1;
FIG. 4 is a detail of the upper end of the bracket; and
FIG. 5 is a sectional view taken along line 55 of FIG. 4.
The numeral designates an I-beam support which forms a part of a bridge structure shown fragmentarily in the drawing. A concrete form is shown supported adjacent the upper flange 13 of support 10 and includes a floor 12, a plurality of transverse joists 14, and a number of lapped, longitudinal beams 16. As is clear in FIG. 2, floor 12 is divided into two sections 12a and 12b which are disposed on opposite sides of the upper flange 13 of support 10. Two rows of joists 14 are shown underlying respective sections 12a and 12b. Beams 16 .extend beneath the joists 14 which support the outer or overhangsection 12b of the floor, a number of longitudinal joists 18 being utilized as additional support to stabilize the transverse joists 14.
Joists 14 and 18 may comprise 2 x 6 lumber stock, double 2 x 6s being employed to form the longitudinal joists 18. Each beam 16 may comprise 3 x 12 lumber stock, attention being directed to the utilization of brackets 20 which extend between the lapped portions of beams 16 and the base fiange 22 of support 10.
Each bracket 20 comprises an elongated, longitudinally extensible and retractable strut 24 having a pair of relatively telescoped tubes 26 secured together by three crossbolts 28 extending through three of a series of holes 30 in tubes 26. Tubes 26 are formed from square structural tubing, the lower end of the normally lowermost tube 26 being provided with a transverse tube section 32 which presents a foot that rests against and is supported by the lower flange 22 of support 10.
A tubular, transversely circular element 34 is rigid with the upper end of the normally uppermost tube 26 and is disposed with its longitudinal axis extending transversely of the longitudinal axis of strut 24. Element 34 presents a convex, upwardly facing bearing surface 36 which is received by a socket member 38 in the form of an arcuate plate having a concave, downwardly facing surface 40 which slidably engages surface 36. A pair of braces 42 secure member 38 to the base 44 of an elongated, transversely channel-shaped seat 46 having a pair of spaced, upright legs 48 integral with the base 44. Seat 46 receives the lapped beams 16 and may be held against movement relative to the beams during installation of the bracket by nails driven through holes 50 in legs 48.
Member 38 has an elongated slot 52 therein which receives a threaded bolt or fastener 54 and provides clearance for the fastener to permit member 38 to be adjustably positioned on element 34 within limits defined by slot 52. Element 34 is apertured to receive the shank of fastener 54, a nut 56 being welded to the internal surface of element 34 in alignment with the fastener receiving aperture.
A clearance opening 58 adjacent the upper end of the upper tube 26 permits the insertion of a threaded rod 69 into a hole 62 on the opposite side of the tube. A wing nut 64 is threaded onto the projecting extremity 66 of rod 60, the opposite extremity 68 thereof being connected to a tie wire 70. A bolt 72 extends upwardly between the two sections of the longitudinal joist 18 on the opposite side of support 10 from rod 60, bolt 72 being connected to tie wire 70 and held against movement under the pull 3 of the wire by a washer 74. Wire 70 extends over flange 13 and between the edges of the flange and floor sections 12a and 1212, as is clear in FIG. 2.
For purposes of illustration, FIG. 2 shows a slab 76 of concrete resting on floor sections 12a and 12b and flange 13, and formed in a manner to provide a walkway 78 and a railing ledge 80. In the utilization of the instant invention and the components of the form associated therewith, it will be appreciated that such components are removed from the bridge structure after the concrete has set, leaving slab 76 supported by Lbeam support 10 and the other structural members of the bridge which are not revealed in the fragmentary i lustrations.
The brackets of the instant invention are positioned in supporting relationship to beams 16 after the form is constructed and rods 60 and tie wires 70 are in place. The telescoping tubes 26 permit the length of strut 24 to be adjusted such that seat 46 will reach the lapped beams 16 when foot 32 is in place against flange 22. By loosening fastener 54, seat 46 may be pivoted about the axis of element 34 until the base 44 of the seat is disposed in a level attitude to properly receive beams 16. Tightening of fastener 54 then rigidly secures the seat to the strut, and rod 60 may be inserted through the upper tube 26 and held in place by wing nut 64. The weight of the overhang to be formed when the concrete is poured, therefore, is supported by strut 24 and supplemented by rod 60 to prevent drooping of the overhanging structure.
Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:
1. In a structure having an upwardly extending support provided with a lateral flange and an overhang spaced above the flange, and having a beam underlying the overhang and laterally spaced from the support, the combination with said support and said beam of:
an elongated, upwardly extending, longitudinally extensible and retractable strut having an upper and a lower end,
said lower end being provided with a foot bearing against the support and resting on said flange;
a seat receiving said beam and having a flat base;
a pivotal connection on the upper end of said strut mounting said seat thereon for swinging movement about an axis extending in substantial parallelism with said beam, whereby to permit movement of the seat to a position where the base thereof is in underlying supporting relationship to said beam; and
means engageable with said connection for locking the seat in said position.
2. The invention of claim 1,
said connection including an element rigid with said strut and having an outwardly facing, convex bearing surface, and a socket member rigid with said seat and receiving said surface,
said locking means including a fastener engageable with said element and said member.
3. The invention of claim 2,
said member having a clearance slot therein for said fastener,
said element having means threadedly receiving said fastener with the latter extending through said slot whereby, upon disengagement of the fastener and the member, the latter may be rotated on the element between limits defined by said slot.
4. The invention of claim 2,
said element being tubular in configuration and having a longitudinal axis extending transversely of said strut and defining the axis of swinging movement of the seat,
said seat being of elongated, transversely channelshaped configuration presenting said base and having a pair of spaced, normally upright legs,
said member comprising an arcuate plate disposed beneath said base and having a normally downwardly facing, concave surface slidably engaging the convex surface of said element.
5. The invention of claim 2,
said strut including a pair of relatively telescoped tubes,
one of said tubes presenting said upper end; and
an elongated rod having a pair of opposed extremities,
one of said extremities being coupled with said one tube with the rod extending laterally outwardly therefrom; and
a tie wire connected to the other of said extremities and secured to said structure.
References Cited UNITED STATES PATENTS 2,383,104 8/1945 Allen. 3,286,972 11/1966 Jackson 25--13l.5 XR
FOREIGN PATENTS 623,856 7/1961 Canada. 778,387 7/1957 Great Britain.
ROY D. FRAZIER, Primary Examiner.
J. F. FOSS, Assistant Examiner.
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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738602A (en) * 1971-06-30 1973-06-12 A Arnett Joist supporting device
US3784151A (en) * 1971-04-28 1974-01-08 Kwikform Ltd Formwork for use in supporting shuttering
US3806074A (en) * 1971-03-08 1974-04-23 J Ward Interior and fascia overhang forms for concrete and related components, support systems and methods
US4660800A (en) * 1985-10-31 1987-04-28 Horstketter Eugene A Bridge overhang bracket and hanger
US4677787A (en) * 1984-10-15 1987-07-07 Said Ronald S Apparatus for mounting application heads to an agricultural implement
US4792130A (en) * 1986-04-16 1988-12-20 Ardent John C Adjustable support system for marine craft
US4908999A (en) * 1987-05-13 1990-03-20 B. J. Harris (Oxford) Limited Staging
USRE33930E (en) * 1986-04-16 1992-05-19 Adjustable support system for marine craft
US6676333B2 (en) * 2002-02-19 2004-01-13 Richard D. Ruiz, Llc Frame members for a portable dam
CN103306479A (en) * 2013-07-09 2013-09-18 中国中铁航空港建设集团有限公司海南分公司 Long-length overhang trusswork high form hanger system
CN103758343A (en) * 2014-01-26 2014-04-30 中铁建工集团有限公司 Hanging type construction method and hanging device for reinforced concrete floor
CN106121225B (en) * 2016-08-24 2018-05-11 仇国辉 Suspension active erecting device is chosen outside cast-in-place concrete eaves
CN110777665A (en) * 2019-11-08 2020-02-11 广州市第三市政工程有限公司 Construction method of cast-in-situ box girder skylight supporting template

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2383104A (en) * 1943-12-27 1945-08-21 Kirsch Co Curtain rod or drapery fixture
GB778387A (en) * 1954-01-05 1957-07-03 Rapid Metal Developments Ltd Improvements relating to clamping couplings
CA623856A (en) * 1961-07-18 I. Williams Chester Concrete form hardware
US3286972A (en) * 1964-06-19 1966-11-22 James H Jackson Device for suspending forms from structural beams

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA623856A (en) * 1961-07-18 I. Williams Chester Concrete form hardware
US2383104A (en) * 1943-12-27 1945-08-21 Kirsch Co Curtain rod or drapery fixture
GB778387A (en) * 1954-01-05 1957-07-03 Rapid Metal Developments Ltd Improvements relating to clamping couplings
US3286972A (en) * 1964-06-19 1966-11-22 James H Jackson Device for suspending forms from structural beams

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3806074A (en) * 1971-03-08 1974-04-23 J Ward Interior and fascia overhang forms for concrete and related components, support systems and methods
US3784151A (en) * 1971-04-28 1974-01-08 Kwikform Ltd Formwork for use in supporting shuttering
US3738602A (en) * 1971-06-30 1973-06-12 A Arnett Joist supporting device
US4677787A (en) * 1984-10-15 1987-07-07 Said Ronald S Apparatus for mounting application heads to an agricultural implement
US4660800A (en) * 1985-10-31 1987-04-28 Horstketter Eugene A Bridge overhang bracket and hanger
USRE33930E (en) * 1986-04-16 1992-05-19 Adjustable support system for marine craft
US4792130A (en) * 1986-04-16 1988-12-20 Ardent John C Adjustable support system for marine craft
US4908999A (en) * 1987-05-13 1990-03-20 B. J. Harris (Oxford) Limited Staging
US6676333B2 (en) * 2002-02-19 2004-01-13 Richard D. Ruiz, Llc Frame members for a portable dam
CN103306479A (en) * 2013-07-09 2013-09-18 中国中铁航空港建设集团有限公司海南分公司 Long-length overhang trusswork high form hanger system
CN103758343A (en) * 2014-01-26 2014-04-30 中铁建工集团有限公司 Hanging type construction method and hanging device for reinforced concrete floor
CN106121225B (en) * 2016-08-24 2018-05-11 仇国辉 Suspension active erecting device is chosen outside cast-in-place concrete eaves
CN110777665A (en) * 2019-11-08 2020-02-11 广州市第三市政工程有限公司 Construction method of cast-in-situ box girder skylight supporting template

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