CN111041986A - Cast-in-place continuous box girder formwork system and construction method - Google Patents
Cast-in-place continuous box girder formwork system and construction method Download PDFInfo
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- CN111041986A CN111041986A CN201911152041.1A CN201911152041A CN111041986A CN 111041986 A CN111041986 A CN 111041986A CN 201911152041 A CN201911152041 A CN 201911152041A CN 111041986 A CN111041986 A CN 111041986A
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- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Abstract
The invention relates to a cast-in-place continuous box girder formwork system, which comprises a pile-supported cast-in-place continuous box girder bracket system, a cast-in-place continuous box girder outer mold and a cast-in-place continuous box girder inner mold; the pile-supported cast-in-place continuous box girder support system comprises a distribution girder, a Bailey girder, a bearing girder, a buckle device, a steel upright post, a horizontal brace rod, a scissor brace rod, a connecting steel plate, a flange plate, a reinforcing rib, a soft base layer, a hard base layer, a buckle plate ring and a cast-in-place pile; the cast-in-place continuous box girder external mold comprises a flange plate mold, a hinge bolt, a back rib, a side mold, a bottom mold, a safety net, a support rod, an adjustable jacking, a distribution beam, a Bailey beam, a bearing beam, a cross brace and a steel upright post; the cast-in-situ continuous box girder internal mold comprises a steel panel, a side rib, a second bolt, a bar steel, a stay bar, an adjustable jacking, a top rib, a positioning steel bar and a first bolt. The invention has the beneficial effects that: the pile-supported steel stand column buckling device enables the cast-in-situ bored pile steel stand column and the upper transverse bridge bearing beam to be quickly connected and easily detached, and the connection is safe and stable.
Description
Technical Field
The invention relates to a cast-in-place continuous box girder, in particular to a cast-in-place continuous box girder formwork system and a construction method.
Background
With the rapid development of urban construction and the improvement of bridge construction technology in China, box girder structures are more and more widely applied to bridge engineering and are divided into prefabricated box girders and cast-in-place box girders. The cast-in-place box girder is mainly used for large continuous box girders, the existing box girder construction process is basically mature, a standard construction process is adopted, and a construction support needs to be erected and a template needs to be manufactured during construction. Traditional cast-in-place continuous box girder formwork system dismouting process is loaded down with trivial details, and consuming time and power and material loss are big, influence box girder construction progress and to construction cost's effective control.
In summary, it is very important to find a cast-in-place continuous box girder formwork system and a construction method which are convenient to disassemble and assemble, good in economic benefit and capable of being effectively recycled.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a cast-in-place continuous box girder formwork system and a construction method.
The cast-in-situ continuous box girder formwork system comprises a pile-supported cast-in-situ continuous box girder bracket system, a cast-in-situ continuous box girder outer mold and a cast-in-situ continuous box girder inner mold;
the pile-supported cast-in-place continuous box girder support system comprises a distribution girder, a Bailey girder, a bearing girder, a buckle device, a steel upright post, a horizontal brace rod, a scissor brace rod, a connecting steel plate, a flange plate, a reinforcing rib, a soft base layer, a hard base layer, a buckle plate ring and a cast-in-place pile; the cast-in-place pile is arranged on a soft base layer, the pile bottom of the cast-in-place pile extends into a hard base layer, the top of the cast-in-place pile is connected with a steel upright post through a flange plate and a bolt, a reinforcing rib is arranged between the steel upright post and the flange plate, the top end of the steel upright post is provided with a buckle plate ring, a horizontal support rod is arranged between adjacent steel support columns, a scissor support rod is arranged between an upper horizontal support rod and a lower horizontal support rod, and the steel upright post, the horizontal support rod and the scissor support rod are connected through connecting steel plates; the upper part of the buckle plate ring is provided with a pile fixing bar beam reverse-pulling prepressing system, and the pile fixing bar beam reverse-pulling prepressing system comprises bar beams, a jack, an anchor rope and an anchor rod; the bearing beams are arranged at the top ends of the steel upright columns and connected through a buckle device, the Bailey beams are arranged at the upper parts of the bearing beams, and the distribution beams are arranged at the upper parts of the Bailey beams; the buckle device comprises a buckle plate, a buckle shaft, a buckle piece, a safety cable and a safety cable buckle;
the cast-in-place continuous box girder external mold comprises a flange plate mold, a hinge bolt, a back rib, a side mold, a bottom mold, a safety net, a support rod, an adjustable jacking, a distribution beam, a Bailey beam, a bearing beam, a cross brace and a steel upright post; the bearing beam is arranged on the upper part of the steel upright, the Bailey beam is arranged on the upper part of the bearing beam, and the distribution beam is arranged on the upper part of the Bailey beam; the supporting rods are fastener type steel pipe supports, the supporting rods are combined into a supporting rod support in a transverse and vertical staggered mode, adjustable jacking supports are arranged at the ends of the supporting rod, the adjustable jacking supports at the bottom of the supporting rod support are arranged on the distribution beams, the adjustable jacking supports at the top of the supporting rod support are arranged at the back ribs, the cross braces are arranged on the supporting rod support, and the safety net is arranged at the outer side of the supporting rod support along the bridge; the supporting rod support supports and fixes the box girder external mold through the adjustable jacking, the box girder external mold comprises a flange plate mold, a side mold and a bottom mold, back ribs are arranged on the back surfaces of the flange plate mold, the side mold and the bottom mold, the bottom mold and the side mold are connected through hinge bolts by the back ribs, and the flange plate mold and the side mold are connected through hinge bolts by the back ribs;
the cast-in-place continuous box girder internal mold comprises a steel panel, side ribs, second bolts, steel bars, stay bars, adjustable jacking supports, top ribs, positioning steel bars and first bolts, wherein the steel panel is arranged on the side ribs and the top ribs and is connected with the top ribs through the first bolts, the side ribs are symmetrically arranged, the bottom ends of the side ribs are provided with the steel bars and are connected with the top ribs through the second bolts, the side ribs and the top ribs are connected with each other through the first bolts, the stay bars are arranged between the symmetrical side ribs, the stay bars are arranged between the top ribs and the steel bars, the two ends of each stay bar are provided with the adjustable jacking supports, and the steel bars are in threaded connection with the positioning steel bars below the steel bars.
Preferably, the method comprises the following steps: the jack sets up on buckle plate circle upper portion, jack upper portion sets up the strip roof beam, strip roof beam both ends set up the anchor rope, anchor rope lower extreme sets up the stock, the stock bottom mounting is in hard basic unit.
Preferably, the method comprises the following steps: the buckle plate is arranged below the bearing beam, the buckle plate is connected with the buckle piece through the buckle shaft, the buckle is arranged on the inner side of the buckle piece, the safety cable buckle is arranged on the outer side of the buckle piece, and the safety cable is arranged on the safety cable buckle.
Preferably, the method comprises the following steps: the bottom of the bearing beam is connected with a buckling plate ring at the top of the steel upright post in a buckling manner through a buckling device.
Preferably, the method comprises the following steps: the adjustable jacking at the bottom of the vertical support rod is arranged at the upper part of the distribution beam, the adjustable jacking at the top of the vertical support rod is arranged at the lower part of the back rib, and the vertical support rod at the outermost side is higher than the flange plate mould; the adjustable jacking at the inner end of the transverse stay bar is arranged at the side part of the back rib.
Preferably, the method comprises the following steps: the adjacent back ribs are connected through hinged bolts, one end of each back rib is provided with a convex opening with a hinged bolt hole, the other end of each back rib is provided with a concave opening with a hinged bolt hole, and the convex openings are connected with the concave openings in a matched mode.
Preferably, the method comprises the following steps: the top end of the side rib is provided with a notch and a first bolt hole, the two ends of the top rib are provided with a convex opening and a first bolt hole, and the notch and the convex opening are mutually spliced and fixed through a first bolt.
Preferably, the method comprises the following steps: evenly set up the second bolt hole on the bar steel, the spacer bar bottom sets up the mortar cushion, and the spacer bar top sets up the screw thread, and the spacer bar passes through the second bolt hole and the nut is connected with the bar steel.
The construction method of the cast-in-place continuous box girder formwork system comprises the following steps:
firstly, construction setting-out is carried out, the position of a pile foundation is determined, a drilling platform is set up, a hole is drilled, a cast-in-place pile foundation is poured, the pile foundation is embedded into a hard base layer not less than 1m, and a flange plate is embedded into the top of the cast-in-place pile; the method comprises the following steps of completing section manufacturing of a steel upright structure in advance, welding a flange plate and arranging reinforcing ribs at the bottom end of the steel upright, welding a buckle plate ring at the top end of the steel upright, and bolting a cast-in-place pile and the steel upright through the flange plate after a cast-in-place pile foundation is completed; channel steel and a connecting steel plate are welded between the steel upright posts transversely to form a horizontal support rod and a scissor support rod; installing a pile fixing strip beam reverse-pulling prepressing system, respectively erecting a jack on a buckling plate ring at the top end of a steel upright post, installing a strip beam on the jack, tying anchor ropes at two ends of the strip beam, tying the lower ends of the anchor ropes on an anchor rod, and vertically fixing the bottom end of the anchor rod on a hard base layer; applying force to the bar beam through a jack, reversely transmitting the force to the steel upright column, checking the overall stability of the support and the actual bearing capacity of the support foundation, and mastering the uneven settlement rule;
step two, mounting a transverse bearing beam at the top end of the steel upright post, and tightly buckling and connecting the bottom of the bearing beam with a buckling plate ring at the top of the steel upright post through a buckling device; accurately lofting the position of the Bailey truss on a bearing beam in the transverse bridge direction, and assembling the Bailey beams in sections; laying distribution beams at equal intervals along the bridge direction on the top of the Bailey beam, fixing the distribution beams on the Bailey truss by using U-shaped bolts, erecting full socket buckle type brace rod supports on the distribution beams, hanging a safety net, and supporting and fixing the box beam outer die by the brace rod supports through adjustable jacking supports;
step three, after the support rod bracket is erected and a pre-pressing test is carried out, firstly hoisting a bottom die and installing the bottom die on the support rod bracket; hoisting the side mold, connecting the bottom mold and the side mold through a back rib by adopting a hinge bolt, and fixing by utilizing a support rod bracket; finally, hoisting the flange plate mould, connecting the side mould and the flange plate mould through a back rib by adopting a hinge bolt, and fixing by utilizing a support rod bracket; the outer mold of the box girder meets the engineering design requirement by adjusting the adjustable jacking on the brace rod bracket;
step four, binding a bottom plate and a web plate steel bar after the installation of each span of external mold is finished, installing a prestressed corrugated pipe and a steel strand, and then installing the box girder internal mold; according to the design size of the box girder inner mold, a steel panel, side ribs and top ribs of an inner mold are processed in advance, and the assembly of the side mold and the top mold of an inner mold monomer is carried out by utilizing an assembly jig frame in an assembly field; the steel panels are connected by U-shaped clamps, the side ribs, the top ribs and the steel panels are connected by first bolts, and iron adhesive tapes are arranged at seams; the symmetrical inner die side dies are connected with the bar steel in a bolted mode through the bottom ends of the side ribs, the side ribs and the top ribs are combined through the convex openings and the concave openings and are connected and closed through first bolts; then, an internal mold support is erected by using a support rod, and an adjustable jacking is arranged at the contact part of the support rod and the side rib, the bar steel and the top rib;
hoisting the internal mold lacking the top mold to the position above the bottom plate steel bar net by using a crane, and connecting the positioning steel bar with the mortar cushion block at the bottom end with the bar steel by bolting for fixing and positioning the internal mold; the inner mold monomers are connected by bolts, and double-sided adhesive tapes are adhered to joints in advance; then, performing first pouring of the box girder, including pouring and vibrating of the bottom plate and the web plate; after the concrete pouring of the bottom plate and the web plate of the box girder is finished to a certain degree, hoisting and installing an internal mold top mold, binding top plate reinforcing steel bars, and performing secondary pouring of the box girder, wherein the secondary pouring comprises a top plate and a flange plate of the box girder;
sixthly, pouring the span box girder, and disassembling the template after the concrete reaches a certain strength; when the internal mold is disassembled, the adjustable jacking supports are unscrewed firstly to enable the template to fall off, the support rods are disassembled, the U-shaped clamps and the bolts are disassembled, and then the template is taken out block by block; cleaning the disassembled template, and assembling for the next use according to the requirements; when the outer template is disassembled, the adjustable jacking support is loosened locally, one end of the template is separated slightly by utilizing the self weight of the steel template, then the hinge bolt is disassembled, and the flange plate template, the side template and the bottom template are gradually disassembled.
The invention has the beneficial effects that:
1) the pile-supported steel stand column buckling device enables the cast-in-situ bored pile steel stand column and the upper transverse bridge bearing beam to be quickly connected and easily detached, and the connection is safe and stable; the pile fixing bar beam counter-pulling prepressing system can check the overall stability of the support and the actual bearing capacity of the support foundation, master the uneven settlement rule and eliminate hidden dangers in advance.
2) The internal mold fixing and positioning device provided by the invention can accurately control the positioning height and stability of the internal mold by adjusting the number of the nuts and the positioning steel bars; the connecting parts of the side ribs and the top ribs can be quickly connected and easily detached, so that the pouring and vibrating concrete of the box girder bottom plate are facilitated.
3) The cast-in-place continuous box girder external mold is a combined steel template, has high rigidity and is not easy to deform; the bottom die, the side die and the flange plate die are connected through the hinged bolts to form the box girder outer die, the adjustable jacking is loosened locally when the die plate is disassembled, the self weight of the steel die plate is utilized to enable one end of the die plate to be separated slightly, the hinged bolts are disassembled again, the flange plate die, the side die and the bottom die are disassembled step by step, the turnover use is carried out, the disassembly time and the labor are saved, the loss is small, and the box girder outer die is economical and practical.
Drawings
FIG. 1 is a layout of a cast-in-place continuous box girder formwork system;
FIG. 2 is a layout diagram of a pile-supported cast-in-place continuous box girder support system;
FIG. 3 is a schematic view of a pile fixing bar beam counter-pulling pre-pressing system;
FIG. 4 is a schematic illustration of the fastening of the buckle device;
FIG. 5 is an extended bottom view of the latch;
FIG. 6 is a schematic view of the outer mold of the box girder;
FIG. 7 is a schematic view of a dorsal rib connection;
FIG. 8 is a cross-sectional view of an inner mold of a cast-in-place continuous box girder;
FIG. 9 is a schematic view of a first cast inner box form;
FIG. 10 is a schematic view of a second cast inner box form;
FIG. 11 is a schematic view of an inner mold positioning device;
FIG. 12 is a schematic illustration of a strip steel cloth hole;
FIG. 13 is a schematic view of a side rib and top rib connection member.
Description of reference numerals: 1-distribution beam; 2-bailey beam; 3-a spandrel girder; 4-a buckle device; 5-steel upright post; 6-horizontal stay bar; 7-a scissor brace rod; 8-connecting the steel plates; 9-flange plate; 10-reinforcing ribs; 11-Soft base layer; 12-hard base layer; 13-bar beam; 14-jack; 15-a buckle ring; 16-anchor line; 17-anchor rod; 18-cast-in-place pile; 19-pinch plate; 20-a snap shaft; 21-buckling; 22-snap sheet; 23-safety cable; 24-safety cable buckle; 25-flange plate mould; 26-hinge bolt; 27-back rib; 28-side mold; 29-bottom die; 30-safety net; 31-stay bar; 32-adjustable jacking; 33-a scissor brace; 34-a convex opening; 35-hinge bolt hole; 36-a notch; 37-first bolt hole; 38-steel face plate; 39-side ribs; 40-second bolt; 41-bar steel; 42-second bolt hole; 43-top rib 44-nut; 45-thread; 46-positioning steel bars; 47-mortar pad; 48-first bolt.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The cast-in-situ continuous box girder formwork system comprises a pile-supported cast-in-situ continuous box girder bracket system, a cast-in-situ continuous box girder outer mold and a cast-in-situ continuous box girder inner mold.
The pile-supported cast-in-place continuous box girder support system comprises a distribution girder 1, a Bailey girder 2, a bearing girder 3, a buckle device 4, a steel upright post 5, a horizontal support rod 6, a scissor support rod 7, a connecting steel plate 8, a flange plate 9, a reinforcing rib 10, a soft base layer 11, a hard base layer 12, a buckle ring 15 and a cast-in-place pile 18; the cast-in-place pile 18 is arranged on the soft base layer 11, the pile bottom of the cast-in-place pile 18 extends into the hard base layer 12, the top of the cast-in-place pile 18 is connected with the steel upright post 5 through a flange plate 9 through a bolt, the reinforcing rib 10 is arranged between the steel upright post 5 and the flange plate 9, the top end of the steel upright post 5 is provided with a buckle plate ring 15, the horizontal support rods 6 are arranged between the adjacent steel upright posts 5 and are arranged up and down twice, the cross support rods 7 are arranged between the upper horizontal support rod 6 and the lower horizontal support rod 6, and the steel upright post 5, the horizontal support rods 6 and the cross support rods 7 are connected through a connecting steel plate 8; the upper part of the buckle plate ring 15 is provided with a pile fixing strip beam reverse-pulling prepressing system for prepressing the bracket, the pile fixing strip beam reverse-pulling prepressing system comprises a strip beam 13, a jack 14, an anchor rope 16 and an anchor rod 17, the jack 14 is arranged at the upper part of the buckle plate ring 15, the strip beam 13 is arranged at the upper part of the jack 14, the anchor rope 16 is arranged at two ends of the strip beam 13, the lower end of the anchor rope 16 is provided with the anchor rod 17, and the bottom end of the anchor rod 17 is fixed in the hard base layer 12; the bearing beam 3 is arranged at the top end of the steel upright post 5, the bottom of the bearing beam 3 is in tight buckling connection with a buckling ring 15 at the top of the steel upright post 5 through a buckling device 4, the Bailey beam 2 is arranged at the upper part of the bearing beam 3, and the distribution beam 1 is arranged at the upper part of the Bailey beam 2; the buckling device 4 comprises a buckling plate 19, a buckling shaft 20, a buckle 21, a buckling piece 22, a safety cable 23 and a safety cable buckle 24, the buckling plate 19 is arranged below the bearing beam 3, the buckling plate 19 is connected with the buckling piece 22 through the buckling shaft 20, the buckle 21 is arranged on the inner side of the buckling piece 22, the safety cable buckle 24 is arranged on the outer side of the buckling piece 22, and the safety cable 23 is arranged on the safety cable buckle 24 to ensure safe and firm connection.
The cast-in-place continuous box girder external mold comprises a flange plate mold 25, a hinge bolt 26, a back rib 27, a side mold 28, a bottom mold 29, a safety net 30, a support rod 31, an adjustable jacking 32, a distribution beam 1, a Bailey beam 2, a bearing beam 3, a cross brace 33 and a steel upright post 5; the bearing beam 3 is arranged on the upper portion of the steel upright post 5, the Bailey beam 2 is arranged on the upper portion of the bearing beam 3, and the distribution beam 1 is arranged on the upper portion of the Bailey beam 2; the supporting rods 31 are fastener type steel pipe supports, the supporting rods 31 are combined into a supporting rod support in a transverse and vertical staggered mode, adjustable jacking supports 32 are arranged at the end portions of the supporting rods 31, the adjustable jacking supports 32 at the bottoms of the supporting rod supports are arranged on the distribution beam 1, the adjustable jacking supports 32 at the tops of the supporting rod supports are arranged at the back ribs 27, the scissor supports 33 are arranged on the supporting rod supports, and the safety net 30 is arranged at the outer sides of the supporting rod supports along the bridge; the supporting rod support supports and fixes the box girder external mold through the adjustable jacking 32, the box girder external mold comprises a flange plate mold 25, a side mold 28 and a bottom mold 29, back ribs 27 are arranged on the back surfaces of the flange plate mold 25, the side mold 28 and the bottom mold 29, one end of each back rib 27 is provided with a convex opening 34 with a hinge bolt hole 35, the other end of each back rib 27 is provided with a concave opening 36 with a hinge bolt hole 35, and the convex openings 34 are connected with the concave openings 36 in a matched mode; the bottom die 29 and the side die 28 are connected through a hinge bolt 26 by a back rib 27, and the flange plate die 25 and the side die 28 are connected through a hinge bolt 26 by the back rib 27.
The cast-in-situ continuous box girder internal mold comprises a steel panel 38, side ribs 39, second bolts 40, bar steels 41, supporting rods 31, adjustable top supports 32, a top rib 43, positioning reinforcing steel bars 46 and first bolts 48, wherein the steel panel 38 is arranged on the side ribs 39 and the top rib 43 and connected through the first bolts 48, the side ribs 39 are symmetrically arranged, the bar steels 41 are arranged at the bottom ends of the side ribs 39 and connected through the second bolts 40, the side ribs 39 and the top rib 43 are connected through the first bolts 48, notches 36 and first bolt holes 37 are arranged at the top ends of the side ribs 39, protrusions 34 and first bolt holes 37 are arranged at the two ends of the top rib 43, the notches 36 and the protrusions 34 are spliced with each other and fixed through the first bolts 48, the supporting rods 31 are arranged between the symmetrical side ribs 39, the supporting rods 31 are arranged between the top ribs 43 and the bar steels 41, the adjustable top supports 32 are arranged at the two ends of the supporting rods 31, the positioning reinforcing steel bars 46 below the bar steels 41 are in threaded connection, evenly set up second bolt hole 42 on the bar 41, positioning reinforcement 46 bottom sets up mortar cushion 47, and positioning reinforcement 46 top sets up screw thread 45, and positioning reinforcement 46 passes through second bolt hole 42 and nut 44 and is connected with bar 41.
The construction method of the cast-in-place continuous box girder formwork system comprises the following steps:
firstly, construction setting-out is carried out according to engineering design requirements, the position of a pile foundation is determined, a drilling platform is erected, a C20 concrete cast-in-place pile foundation is drilled and poured, the diameter of the pile foundation is 1m, the embedded hard base layer 12 is not smaller than 1m, and a flange plate 9 is embedded in the top of a cast-in-place pile 18. The phi 820 multiplied by 10mm steel upright post 5 structure is segmented in a processing field in advance, a flange plate 9 is welded at the bottom end of a steel pipe, a reinforcing rib 10 is arranged, a buckle plate ring 15 is welded at the top end of the steel pipe, and after the cast-in-place pile foundation is completed, a cast-in-place pile 18 and the steel upright post 5 are bolted through the flange plate 9. The steel pipe and the steel pipe are transversely welded by channel steel and a connecting steel plate 8 to form a horizontal support rod 6 and a shear support rod 7, so that the steel upright post 5 is ensured to be vertically stable. And installing a pile fixing strip beam reverse-pulling prepressing system, erecting a jack 14 on a buckling plate ring 15 at the top end of the steel upright post 5 respectively, installing a steel strip beam 13 on the jack 14, tying anchor ropes 16 at two ends of the strip beam 13, tying the other end of each anchor rope 16 on an anchor rod 17, and vertically fixing the bottom end of each anchor rod 17 on the hard base layer 12. The jack 14 applies force to the bar beam 13 and reversely transmits the force to the pile bearing type steel upright post 5, the overall stability of the support and the actual bearing capacity of the support foundation are checked, and the uneven settlement rule is mastered.
Secondly, mounting a duplex 63b I-shaped steel serving as a transverse bridge-direction bearing beam 3 at the top end of the steel upright post 5, and tightly buckling and connecting the bottom of the bearing beam 3 with a buckling ring 15 at the top of the steel upright post 5 through a buckling device 4; accurately lofting the position of the Bailey truss on a bearing beam 3 in the transverse bridge direction, and assembling the Bailey beam 2 by sections by using a crane; I20H-shaped steel distribution beams 1 are laid on the top of the Bailey beams 2 at intervals of 90cm along the bridge direction, the distribution beams 1 are fixed on the Bailey beams by U-shaped bolts, full socket buckle type brace supports are erected on the distribution beams 1, safety nets 30 are hung, and the brace supports support and fix a box beam outer die through adjustable jacking brackets 32.
Step three, after the brace rod support is erected and a pre-pressing test is carried out, firstly hoisting a bottom die 29 and installing the bottom die on the brace rod support; hoisting the side mold 28, connecting the bottom mold 29 and the side mold 28 through a back rib 27 by using a hinge bolt 26, and fixing by using a support rod bracket; and finally, hoisting the flange plate mould 25, connecting the side mould 28 and the flange plate mould 25 through a back rib 27 by using a hinge bolt 26, and fixing by using a support rod bracket. The box girder external mold can meet the engineering design requirements by adjusting the adjustable jacking 32 on the brace rod bracket.
And step four, binding a bottom plate and a web plate steel bar after the installation of each span of external mold is finished, installing a prestressed corrugated pipe and a steel strand, and then installing the box girder internal mold. According to the design size of the box girder inner mold, the steel panel 38, the side ribs 39 and the top ribs 43 of the inner mold are processed in advance, and the assembling of the inner mold single side mold and the top mold is carried out by utilizing an assembling jig frame in an assembling field. The steel panels 38 are connected through U-shaped clamps, the side ribs 39 and the top ribs 43 are connected with the steel panels 38 through first bolts 48, and iron-coated fabric is adopted at seams to prevent slurry leakage. The symmetrical inner film side molds are connected with each other through bolting of the bottom ends of the side ribs 39 and the bar steel 41, the side ribs 39 and the top ribs 43 are combined through the convex openings 34 and the concave openings 36, and are connected and closed through the first bolts 48. Then the inner mold support is built up by using the support rod 31. The contact parts of the stay bar 31, the side ribs 39, the bar steel 41 and the top rib 43 are provided with the adjusting jacking 32, so that the adjusting jacking is convenient to adjust and disassemble.
And step five, hoisting the internal mold lacking the top mold to the position above the bottom plate reinforcing steel bar net by using a crane, and connecting the positioning reinforcing steel bars 46 with the mortar cushion blocks 47 at the bottom ends with the bar steel 41 through bolting for fixing and positioning the internal mold. The inner mould monomers are connected by bolts, and double faced adhesive tapes are pasted at joints in advance to prevent slurry leakage of the abutted seams. Then, performing first pouring of the box girder, including pouring and vibrating of the bottom plate and the web plate; and after the concrete pouring of the box girder bottom plate and the web plate is completed to a certain degree, hoisting and installing an internal mold top mold, binding top plate reinforcing steel bars, and pouring the box girder for the second time, wherein the top plate and the flange plate comprise the box girder.
And sixthly, pouring the span box girder, and disassembling the template after the concrete reaches a certain strength. When the internal mold is removed, the adjustable jacking 32 is unscrewed firstly, so that the template falls off, the support rods 31 are removed, the U-shaped clamps and the bolts are removed, and then the template is taken out block by block. Cleaning the disassembled template in time, and assembling according to requirements for next use; when the outer template is disassembled, the adjustable jacking 32 is partially loosened, one end of the template is slightly separated by utilizing the self weight of the steel template, then the hinge bolt 26 is disassembled, and the flange plate template 25, the side template 28 and the bottom template 29 are gradually disassembled.
Claims (9)
1. The cast-in-place continuous box girder formwork system is characterized by comprising a pile-supported cast-in-place continuous box girder bracket system, a cast-in-place continuous box girder outer mold and a cast-in-place continuous box girder inner mold;
the pile-supported cast-in-place continuous box girder support system comprises a distribution girder (1), a Bailey girder (2), a bearing girder (3), a buckle device (4), a steel upright (5), a horizontal stay bar (6), a shear stay bar (7), a connecting steel plate (8), a flange plate (9), a reinforcing rib (10), a soft foundation layer (11), a hard foundation layer (12), a buckle ring (15) and a cast-in-place pile (18); the cast-in-place pile (18) is arranged on a soft base layer (11), the pile bottom of the cast-in-place pile (18) extends into a hard base layer (12), the top of the cast-in-place pile (18) is connected with a steel upright post (5) through a flange plate (9) through a bolt, a reinforcing rib (10) is arranged between the steel upright post (5) and the flange plate (9), a buckle plate ring (15) is arranged at the top end of the steel upright post (5), the horizontal support rods (6) are arranged between adjacent steel struts (5), the shear support rods (7) are arranged between an upper horizontal support rod and a lower horizontal support rod (6), and the steel upright post (5), the horizontal support rods (6) and the shear support rods (7) are connected through a connecting steel plate (8); the upper part of the buckle plate ring (15) is provided with a pile fixing strip beam reverse-pulling prepressing system, and the pile fixing strip beam reverse-pulling prepressing system comprises a strip beam (13), a jack (14), an anchor rope (16) and an anchor rod (17); the bearing beam (3) is arranged at the top end of the steel upright post (5) and connected through a buckle device (4), the Bailey beam (2) is arranged at the upper part of the bearing beam (3), and the distribution beam (1) is arranged at the upper part of the Bailey beam (2); the buckle device (4) comprises a buckle plate (19), a buckle shaft (20), a buckle (21), a buckle sheet (22), a safety cable (23) and a safety cable buckle (24);
the cast-in-place continuous box girder outer mold comprises a flange plate mold (25), a hinge bolt (26), a back rib (27), a side mold (28), a bottom mold (29), a safety net (30), a stay bar (31), an adjustable jacking (32), a distribution beam (1), a Bailey beam (2), a bearing beam (3), a scissor support (33) and a steel upright post (5); the bearing beam (3) is arranged on the upper portion of the steel upright post (5), the Bailey beam (2) is arranged on the upper portion of the bearing beam (3), and the distribution beam (1) is arranged on the upper portion of the Bailey beam (2); the supporting rods (31) are supported by fastener type steel pipes, the supporting rods (31) are staggered horizontally and vertically to form supporting rod supports, adjustable jacking supports (32) are arranged at the end parts of the supporting rods (31), the adjustable jacking supports (32) at the bottoms of the supporting rod supports are arranged on the distribution beam (1), the adjustable jacking supports (32) at the tops of the supporting rod supports are arranged at the back ribs (27), the cross braces (33) are arranged on the supporting rod supports, and the safety net (30) is arranged at the outer sides of the supporting rod supports along the bridge; the supporting rod support supports and fixes the box girder external mold through the adjustable jacking (32), the box girder external mold comprises a flange plate mold (25), a side mold (28) and a bottom mold (29), back ribs (27) are arranged on the back surfaces of the flange plate mold (25), the side mold (28) and the bottom mold (29), the bottom mold (29) is connected with the side mold (28) through the back ribs (27) and the hinge bolts (26), and the flange plate mold (25) is connected with the side mold (28) through the back ribs (27) and the hinge bolts (26);
the cast-in-situ continuous box girder inner mold comprises a steel panel (38), a side rib (39), a second bolt (40), a bar steel (41), a stay bar (31), an adjustable jacking (32), a top rib (43), a positioning steel bar (46) and a first bolt (48), the steel face plate (38) is arranged on the side rib (39) and the top rib (43) and connected through a first bolt (48), the side ribs (39) are symmetrically arranged, the bottom ends of the side ribs (39) are provided with bar steels (41) and connected through second bolts (40), the side ribs (39) and the top rib (43) are connected by first bolts (48), a stay bar (31) is arranged between the symmetrical side ribs (39), the stay bar (31) is arranged between the top rib (43) and the bar steel (41), adjustable jacking supports (32) are arranged at two ends of the supporting rod (31), and the bar steel (41) is in threaded connection with a positioning steel bar (46) below the bar steel.
2. The cast-in-place continuous box girder formwork system according to claim 1, wherein the jack (14) is arranged at the upper part of the buckle plate ring (15), the bar beam (13) is arranged at the upper part of the jack (14), the anchor rope (16) is arranged at two ends of the bar beam (13), the anchor rope (16) is provided with an anchor rod (17) at the lower end, and the bottom end of the anchor rod (17) is fixed in the hard base layer (12).
3. The cast-in-place continuous box girder formwork system according to claim 1, wherein the buckle plate (19) is arranged below the bearing beam (3), the buckle plate (19) is connected with the buckle piece (22) through the buckle shaft (20), the buckle (21) is arranged on the inner side of the buckle piece (22), the safety cable buckle (24) is arranged on the outer side of the buckle piece (22), and the safety cable (23) is arranged on the safety cable buckle (24).
4. The cast-in-place continuous box girder formwork system according to claim 1, characterized in that the bottom of the bearing beam (3) is connected with a buckle ring (15) at the top of the steel upright post (5) by a buckle device (4).
5. The cast-in-place continuous box girder formwork system according to claim 1, wherein the adjustable top support (32) at the bottom of the vertical stay bar (31) is arranged at the upper part of the distribution beam (1), the adjustable top support (32) at the top of the vertical stay bar (31) is arranged at the lower part of the back rib (27), and the outermost vertical stay bar (31) is higher than the flange plate formwork (25); the adjustable jacking (32) at the inner end of the transverse stay bar (31) is arranged at the side part of the back rib (27).
6. The cast-in-place continuous box girder formwork system according to claim 1, wherein adjacent back ribs (27) are connected through hinge bolts (26), one end of each back rib (27) is provided with a convex opening (34) with a hinge bolt hole (35), the other end of each back rib is provided with a concave opening (36) with a hinge bolt hole (35), and the convex openings (34) are matched and connected with the concave openings (36).
7. The cast-in-place continuous box girder formwork system according to claim 1, wherein the side rib (39) is provided with a notch (36) and a first bolt hole (37) at the top end, the top rib (43) is provided with a lug (34) and a first bolt hole (37) at the two ends, and the notch (36) and the lug (34) are spliced with each other and fixed through a first bolt (48).
8. The cast-in-place continuous box girder formwork system according to claim 1, wherein the bar steel (41) is uniformly provided with second bolt holes (42), the bottom end of the positioning steel bar (46) is provided with a mortar cushion block (47), the top end of the positioning steel bar (46) is provided with a thread (45), and the positioning steel bar (46) is connected with the bar steel (41) through the second bolt holes (42) and the nuts (44).
9. A construction method of a cast-in-place continuous box girder formwork system according to claim 1, comprising the steps of:
firstly, construction setting-out is carried out, the position of a pile foundation is determined, a drilling platform is set up, drilling is carried out, a cast-in-place pile foundation is poured, the pile foundation is embedded into a hard base layer (12) and is not less than 1m, and a flange plate (9) is embedded into the top of a cast-in-place pile (18); the method comprises the following steps of (1) completing sectional manufacturing of a steel upright post (5) in advance, welding a flange plate (9) at the bottom end of the steel upright post (5) and arranging a reinforcing rib (10), welding a buckle plate ring (15) at the top end of the steel upright post (5), and bolting a cast-in-place pile (18) and the steel upright post (5) through the flange plate (9) after a cast-in-place pile foundation is completed; the steel upright posts (5) are welded with channel steel and connecting steel plates (8) transversely to form horizontal support rods (6) and scissor support rods (7); installing a pile fixing strip beam reverse-pulling prepressing system, respectively erecting a jack (14) on a buckle plate ring (15) at the top end of a steel upright post (5), installing a strip beam (13) on the jack (14), tying anchor ropes (16) at two ends of the strip beam (13), tying the lower ends of the anchor ropes (16) on anchor rods (17), and vertically fixing the bottom ends of the anchor rods (17) on a hard base layer (12); applying force to the bar beam (13) through the jack (14), reversely transmitting the force to the steel upright post (5), checking the integral stability of the support and the actual bearing capacity of the support foundation, and mastering the uneven settlement rule;
step two, installing a transverse bearing beam (3) at the top end of the steel upright post (5), and tightly buckling and connecting the bottom of the bearing beam (3) with a buckle plate ring (15) at the top of the steel upright post (5) through a buckle device (4); accurately lofting the position of the Bailey truss on a bearing beam (3) in the transverse bridge direction, and assembling the Bailey beam (2) in a segmented manner; the top of the Bailey beam (2) is paved with distribution beams (1) at equal intervals along the bridge direction, the distribution beams (1) are fixed on the Bailey truss by U-shaped bolts, full socket buckle type brace rod supports are erected on the distribution beams (1), safety nets (30) are hung, and the brace rod supports support and fix the box girder outer die through adjustable jacking brackets (32);
step three, after the brace rod support is erected and a pre-pressing test is carried out, firstly hoisting a bottom die (29) and installing the bottom die on the brace rod support; hoisting the side mold (28), connecting the bottom mold (29) and the side mold (28) through a back rib (27) by adopting a hinge bolt (26), and fixing by utilizing a support rod bracket; finally, hoisting the flange plate mould (25), connecting the side mould (28) with the flange plate mould (25) through a back rib (27) by using a hinge bolt (26), and fixing by using a support rod bracket; the outer mold of the box girder meets the engineering design requirement by adjusting the adjustable jacking (32) on the brace rod bracket;
step four, binding a bottom plate and a web plate steel bar after the installation of each span of external mold is finished, installing a prestressed corrugated pipe and a steel strand, and then installing the box girder internal mold; according to the design size of the box girder inner mold, a steel panel (38), side ribs (39) and top ribs (43) of an inner mold are processed in advance, and the inner mold single side mold and the top mold are assembled by using an assembling jig in an assembling field; the steel panels (38) are connected by U-shaped clamps, the side ribs (39) and the top rib (43) are connected with the steel panels (38) by first bolts (48), and iron adhesive tapes are arranged at seams; the symmetrical inner die side dies are connected with the bar steel (41) through the bottom ends of the side ribs (39) in a bolted mode, the side ribs (39) are combined with the top rib (43) through the convex openings (34) and the concave openings (36), and the side ribs and the top rib are connected and closed through first bolts (48); then, an internal mold support is erected by using a support rod (31), and an adjustable jacking (32) is arranged at the contact part of the support rod (31) and the side rib (39), the bar steel (41) and the top rib (43);
hoisting the internal mold lacking the top mold to the position above the bottom plate steel bar net by using a crane, and connecting a positioning steel bar (46) with a mortar cushion block (47) at the bottom end with a bar steel (41) through bolting for fixing and positioning the internal mold; the inner mold monomers are connected by bolts, and double-sided adhesive tapes are adhered to joints in advance; then, performing first pouring of the box girder, including pouring and vibrating of the bottom plate and the web plate; after the concrete pouring of the bottom plate and the web plate of the box girder is finished to a certain degree, hoisting and installing an internal mold top mold, binding top plate reinforcing steel bars, and performing secondary pouring of the box girder, wherein the secondary pouring comprises a top plate and a flange plate of the box girder;
sixthly, pouring the span box girder, and disassembling the template after the concrete reaches a certain strength; when the internal mold is removed, the adjustable jacking supports (32) are unscrewed to enable the templates to fall off, the support rods (31) are removed, the U-shaped clamps and the bolts are removed, and then the templates are taken out block by block; cleaning the disassembled template, and assembling for the next use according to the requirements; when the outer template is disassembled, the adjustable jacking supports (32) are loosened locally, one end of the template is separated slightly by utilizing the self weight of the steel template, then the hinge bolts (26) are disassembled, and the flange plate template (25), the side template (28) and the bottom template (29) are disassembled step by step.
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| CN201911152041.1A CN111041986A (en) | 2019-11-22 | 2019-11-22 | Cast-in-place continuous box girder formwork system and construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111691450A (en) * | 2020-06-17 | 2020-09-22 | 无锡市航道工程有限公司 | Concrete construction process for top beam plate of high-pile beam plate type wharf |
| CN112458916A (en) * | 2020-11-30 | 2021-03-09 | 中冶建工集团有限公司 | Construction method for pouring bottom of box girder inner mold |
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2019
- 2019-11-22 CN CN201911152041.1A patent/CN111041986A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111691450A (en) * | 2020-06-17 | 2020-09-22 | 无锡市航道工程有限公司 | Concrete construction process for top beam plate of high-pile beam plate type wharf |
| CN112458916A (en) * | 2020-11-30 | 2021-03-09 | 中冶建工集团有限公司 | Construction method for pouring bottom of box girder inner mold |
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