CN218621839U - Steel-concrete joint section construction support system of hybrid beam cable-stayed bridge - Google Patents
Steel-concrete joint section construction support system of hybrid beam cable-stayed bridge Download PDFInfo
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- CN218621839U CN218621839U CN202222767681.7U CN202222767681U CN218621839U CN 218621839 U CN218621839 U CN 218621839U CN 202222767681 U CN202222767681 U CN 202222767681U CN 218621839 U CN218621839 U CN 218621839U
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Abstract
The utility model discloses a mixed beam cable-stayed bridge steel-concrete combined section construction supporting system, wherein an upper steel-concrete connecting structure is arranged at the top of a lower bearing structure of a steel box girder; the lower bearing structure of the steel box girder comprises a triangular bracket bearing support formed by welding a 0# support steel pipe, a flat connecting support rod and an oblique support rod end to end; the triangular bracket bearing support is sequentially provided with a transverse bridge bearing beam and a longitudinal distribution structure from bottom to top, and a plurality of groups of cushion beams are fixed at the top of the longitudinal distribution structure at certain intervals; the upper steel-concrete connecting structure comprises tie-bar steel arranged on two transverse sides of the bridge and used for temporarily fixing 0# concrete beam sections with the first steel box girder and the second steel box girder, and transverse force-eliminating steel arranged in the transverse middle of the deviated bridge. This braced system adopts the triangle bracket support can avoid adopting to beat in aqueous and establish the pile foundation as falling to the ground support basis, eliminates differential settlement to support overall rigidity, stable class safety influence, simple to operate, and the volume of using steel is little, economical and practical.
Description
Technical Field
The utility model belongs to the technical field of the bridge construction, more specifically relates to a mixed beam cable-stay bridge steel-concrete joint section construction braced system.
Background
The mixed beam cable-stayed bridge is provided with a steel-concrete combined section. And after the construction of the No. 0 concrete section is finished, installing a bridge deck crane on the concrete section, and finishing the construction of the rest steel box girders of the bridge by hoisting the steel box girders. The steel box girder connected with the No. 0 block needs to be temporarily supported and fixed after being hoisted, and the steel box girder hoisting stage can be formally shifted after the construction of concrete and prestress at the joint of the No. 0 block and the steel box girder is finished. For the supporting system, because the weight of the steel box girder and the concrete at the joint part of the steel box girder is heavy, the supporting system belongs to high-altitude operation, the strength, rigidity and stability of the supporting system are particularly important, in order to ensure safety, the structural supporting and fixing system usually adopts a floor support form, the requirement on the foundation is high, a pile foundation needs to be laid, and the floor support usually uses a large amount of steel, is slow to install and has poor economy. For the construction of the steel-concrete joint section, the steel box girder segment in the steel-concrete joint section is hoisted and fixed firstly, the steel bar and the prestressed steel beam of the steel-concrete joint section are installed, the prestressed steel beam is tensioned after the concrete is poured by a vertical mold, and the construction of the steel-concrete joint section is finished. Because the end plate outside the steel box girder is usually a closed structure, the ends of the prestressed pipelines are all arranged on the inner side of the end plate, and the steel box girder is penetrated and bound from the post-pouring section of the steel-concrete combined section, the operation space is small, the construction is inconvenient, and the steel box girder end plate is usually penetrated and bound by temporarily opening a hole, on one hand, the steel box girder structure is damaged, and on the other hand, the difficulty of erecting a safe construction platform is higher.
SUMMERY OF THE UTILITY MODEL
To prior art's defect, the utility model provides a mixed beam cable-stay bridge steel-concrete joint section construction braced system, this braced system adopt triangle bracket can avoid adopting to beat in aqueous and establish the pile foundation as falling to the ground support basis, eliminate differential settlement to support overall rigidity, safe influences such as stable, simple to operate, with little, economical and practical of steel volume.
In order to realize the technical effect, the utility model aims to realize that the construction supporting system of the steel-concrete combined section of the mixed beam cable-stayed bridge comprises a steel box girder lower part bearing structure used for supporting the steel box girder;
an upper steel-concrete connecting structure is arranged at the top of the lower bearing structure of the steel box girder;
the lower bearing structure of the steel box girder comprises a triangular bracket bearing support formed by welding a No. 0 bracket steel pipe, a flat connecting support rod and an oblique support rod end to end; the triangular bracket bearing support is sequentially provided with a transverse bridge bearing beam and a longitudinal distribution structure from bottom to top, and a plurality of groups of cushion beams are fixed at the top of the longitudinal distribution structure at certain intervals;
the upper steel-concrete connecting structure comprises tie-shaped steel which is arranged on two transverse sides of the bridge and used for temporarily fixing 0# concrete beam sections with the first steel box girder and the second steel box girder, and transverse force-eliminating shaped steel which is arranged in the transverse middle of the deviated bridge and used for eliminating transverse uneven force when concrete of the steel-concrete sections is poured.
The inner wall of the steel pipe at the connecting part of the No. 0 support steel pipe and the oblique supporting rod is reinforced by welding longitudinal ribs and circumferential ribs.
The pad beam is of a multi-group section steel transverse splicing structure.
And a plurality of groups of PVC pipes penetrating through the top plate and the bottom plate are pre-embedded at the position, close to the end, of the 0# concrete beam section and are used for mounting finish rolling deformed steel bars and forming a compression joint fixing structure.
One end of the tie section steel is fixed with the No. 0 concrete beam section through the reverse drawing of the finish rolling deformed steel bar, and the other end of the tie section steel is fixed with the corresponding first steel box girder and the second steel box girder in a welding mode.
One end of the transverse force-eliminating section steel is fixed with the 0# block concrete beam section through the reverse drawing of the finish rolling deformed steel bar, and the other end of the transverse force-eliminating section steel is fixed with the corresponding first steel box beam and the second steel box beam in a welded mode.
The longitudinal distribution structure is a Bailey beam, and a plurality of groups of vertical reinforcing and supporting section steel are welded at the position of the vertical rod for local reinforcement.
Generally, through the utility model discloses above technical scheme that conceive compares with prior art, mainly possesses following technical advantage:
1. adopt the triangle bracket support can avoid adopting and beat in aqueous and establish pile foundation as falling to the ground support and supporting the basis, eliminate the differential settlement and to support overall rigidity, stable safety influence such as, simple to operate, with little, economical and practical of steel volume.
2. The construction of the steel-concrete combined section can avoid the need of temporarily forming holes in the steel box girder connecting side end plate closed structure during prestress installation and tensioning, eliminate the damage to the steel box girder structure and improve the quality of the steel box girder structure.
Drawings
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the structural schematic diagram of the construction supporting system of the reinforced concrete-concrete joint section of the utility model.
Fig. 2 is a partially enlarged schematic view of the steel-concrete connection structure at the upper portion of the steel box girder in fig. 1.
Fig. 3 is a schematic plan view of a steel-concrete connection structure on the upper part of a steel box girder.
Fig. 4 is a construction flow chart of a steel-concrete joint section of a hybrid beam cable-stayed bridge.
In the figure: the steel box girder comprises, by weight, 1-2 parts of vertical reinforcing support section steel, 1-3 parts of No. 0 support steel pipes, 1-4 parts of inclined support rods, 1-5 parts of flat connection support rods, 100 parts of a lower bearing structure of a steel box girder, 101 parts of No. 0 concrete girder, 102 parts of steel strands, 103 parts of concrete, 104 parts of transverse bearing girders, 105 parts of longitudinal distribution structures, 200 parts of an upper steel-concrete connection structure, 201 parts of tie section steel, 202 parts of transverse force-dissipating section steel, 300 parts of a first steel box girder, 301 parts of a second steel box girder, 3 parts of finish-rolled deformed steel, 4 parts of a pad girder, 400 parts of a first bridge deck crane and 401 parts of a second bridge deck crane.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
Example 1:
referring to fig. 1-4, a hybrid beam cable-stayed bridge steel-concrete joint section construction supporting system includes a steel box beam lower part bearing structure 100 for supporting a steel box beam; the top of the bearing structure 100 at the lower part of the steel box girder is provided with an upper steel-concrete connecting structure 200; the lower bearing structure 100 of the steel box girder comprises a triangular bracket bearing support formed by welding end to end 0# support steel pipes 1-3, flat connecting support rods 1-5 and oblique support rods 1-4; the triangular bracket bearing support is sequentially provided with a transverse bridge bearing beam 104 and a longitudinal distribution structure 105 from bottom to top, and a plurality of groups of cushion beams 4 are fixed at the top of the longitudinal distribution structure 105 at certain intervals; the upper steel-concrete connecting structure 200 comprises tie-shaped steel 201 arranged on two transverse sides of the bridge and used for temporarily fixing a 0# concrete beam section 101 with a first steel box girder 300 and a second steel box girder 301, and transverse force-eliminating section steel 202 arranged in the transverse middle of a deviation bridge and used for eliminating transverse uneven force when concrete of the steel-concrete section is poured. Through adopting foretell braced system in concrete work progress, can avoid adopting through triangle bracket support to beat in aqueous and establish pile foundation as falling to the ground support and supporting the basis, eliminate the differential settlement and to support safety influences such as rigidity, stability, simple to operate, it is little with the steel volume, economical and practical.
Furthermore, the inner wall of the 0# support steel pipe 1-3 at the connecting part with the inclined support rod 1-4 is reinforced by welding longitudinal ribs and circumferential ribs. Through adopting above-mentioned structure, guaranteed joint strength and stability between the two.
Furthermore, the pad beam 4 is of a multi-group section steel transverse splicing structure. The stability of the steel box girder to the top thereof is ensured by the pad beam 4 of the above-described structure.
Furthermore, a plurality of groups of PVC pipes penetrating through the top plate and the bottom plate are pre-embedded at the position, close to the end, of the 0# concrete beam section 101 and are used for installing the finish rolling deformed steel bar 3 and forming a compression joint fixing structure. The PVC pipe can play a role in protecting the finish rolling deformed steel bar 3.
Further, one end of the tie section steel 201 is reversely pulled and fixed with the 0# block concrete beam section 101 through the finish rolling deformed steel bar 3, and the other end is welded and fixed with the corresponding first steel box girder 300 and the second steel box girder 301.
Further, one end of the transverse force-eliminating section steel 202 is reversely pulled through the finish rolling deformed steel bar 3 and is fixedly pressed with the 0# block concrete beam section 101, and the other end of the transverse force-eliminating section steel is fixedly welded with the corresponding first steel box girder 300 and the second steel box girder 301.
Furthermore, the longitudinal distribution structure 105 is a Bailey beam, and a plurality of groups of vertical reinforcing and supporting section steel 1-2 are welded at the position of a vertical rod for local reinforcement. The connection strength of the structural reinforcing and supporting section steels 1-2 is enhanced.
Example 2:
referring to fig. 4, the construction method for constructing the support system by using the steel-concrete joint section of the hybrid beam cable-stayed bridge comprises the following steps:
firstly, windowing is performed on 0# support steel pipes 1-3, the inner walls of the steel pipes at the connecting parts of the steel pipes and the inclined support rods 1-4 are reinforced by welding longitudinal ribs and circumferential ribs, welding of a triangular bracket bearing support is completed according to a support design drawing, then installation of a top transverse bridge bearing beam 104, a longitudinal distribution structure 105 and a pad beam 4 is completed in sequence, sundries in a beam falling range are cleaned, and the top elevation deviation of the pad beam 4 is controlled within +/-5 mm;
marking a longitudinal datum line at a measuring point on the top of the support at the outer side of the steel box girder corresponding to the 0# concrete girder section 101, and checking and adjusting the plane position of the first bridge floor crane 400 and quickly measuring and aligning the first steel box girder 300; a plurality of measuring points are arranged at the midspan positions of the support rods 1-5 and the cushion beam 4 which are connected in parallel under the cushion beam 4 and used for monitoring the deformation of the bearing structure 100 at the lower part of the steel box beam after the first steel box beam 300 is hoisted and placed; a measuring point is arranged on a cross beam at the top of the first bridge deck crane 400 and used for monitoring the deformation condition of the rack structure after the first bridge deck crane 400 bears the weight;
thirdly, after the first steel box girder 300 segment is transported to the water surface below the installation position through a ship, anchoring and positioning are carried out; in order to prevent the motor car from being adjusted at any time when an emergency occurs in the hoisting process, and the transport ship cannot be flamed out and stopped after being anchored and positioned, small power is required to be adopted for propulsion, so that the flow speed of the water is kept consistent;
after the first steel box girder 300 is hoisted in place, the top plate of the first steel box girder 300 and the top surface of the No. 0 concrete girder section 101 are fixedly connected by adopting the tension section steel 201 and the transverse force-eliminating section steel 202, and the side of the No. 0 concrete girder section 101 is provided with two fixing modes, one mode is that a preformed hole of a supporting leg anchor point of the existing first bridge crane 400 is utilized to be matched with the finish rolling deformed steel 3 for carrying out compression fixing, the other mode is that the preformed hole is fixedly connected with an anti-collision guardrail embedded part constructed on the No. 0 concrete girder section 101 in a welding mode, and the tension section steel 201, the transverse force-eliminating section steel 202 and the top plate of the first steel box girder 300 are fixedly welded;
step five, the connection between a lifting appliance of the first bridge floor crane 400 and a lifting point is released, and the lifting appliance is lifted and adjusted to a position which does not influence the construction of the steel-concrete section;
sixthly, mounting prestressed steel bundles 501 for fastening the first steel box girder 300 and the No. 0 concrete girder section 101 at the port of the No. 0 concrete girder section 101 on the side where the first steel box girder 300 is not mounted, numbering at two ends of the same prestressed steel bundle, penetrating the prestressed steel bundles 501 on the side where the first steel box girder 300 is mounted in place, and naturally sagging the prestressed steel bundles 501 on the side where the steel box girder is not mounted;
seventhly, repeating the operation of the third step, lifting and installing the second steel box girder 301 on the other side, when the second steel box girder 301 is lifted in a variable amplitude mode by a second bridge deck crane 401 and is 2m away from the port face of the No. 0 concrete girder section 101, the second steel box girder 301 falls down at the lowest speed to be in temporary slight contact with the pad girder 4, at the moment, the unloading condition of a display of the second bridge deck crane 401 is not obtained, the second steel box girder 301 does not rotate in posture, a safety brake of the second bridge deck crane 401 locks a brake disc and keeps the posture, and the contact part of the second steel box girder 301 and the pad girder 4 is temporarily welded and fixed by a code plate, so that the shaking caused by wind load in the process of installing the prestress steel beam 501 on the second steel box girder 301 is avoided;
step eight, penetrating the drooping prestressed steel beam 501 into a prestressed pipeline corresponding to the second steel box girder 301, observing the load condition of the second bridge deck crane 401 at any time in the construction process of the prestressed steel beam 501, avoiding obvious unloading, and timely observing whether the main body structure of the second bridge deck crane 401 is deformed, and the rear anchor point, the steel wire rope and the braking system have abnormal conditions or not;
step nine, after the prestressed steel beam 501 completely penetrates into the second steel box girder 301, the second bridge deck crane 401 accurately positions the second steel box girder 301 by means of amplitude variation firstly and transverse movement secondly; when a second bridge floor crane 401 hoists a second steel box girder 301 to fall, a chain block hoist is used for traction and matching with a jack, so that the second steel box girder 301 finishes mileage and axis positioning by contrasting a datum line on a No. 0 concrete segment 101, the second steel box girder 301 falls after being adjusted in place, the deadweight load of the second steel box girder 301 completely falls on a bearing structure 100 at the lower part of the steel box girder, and under the condition that the second bridge floor crane 401 does not remove a hoisting tool, the deformation of the bearing structure 100 at the lower part of the steel box girder and the top surface elevation and mileage axis parameters of the second steel box girder 301 are measured, so that accurate positioning is finished;
step ten, according to the step four, connecting and fixing the top plate of the second steel box girder 301 and the top surface of the No. 0 concrete section 101 by using the section steel, so as to avoid the deviation of the first steel box girder 300 and the second steel box girder 301 when the concrete of the steel-concrete section is poured, which affects the construction quality; comprehensively checking whether abnormal deformation or weld cracking and other abnormal conditions exist in the lower bearing structure 100 of the steel box girder, and filling a thin cushion plate if gaps exist at the contact part of the cushion beam 4 with the first steel box girder 300 and the second steel box girder 301;
eleven, removing connection between a lifting appliance of the second bridge deck crane 401 and a lifting point, and lifting and adjusting the lifting appliance to a position which does not influence the construction of the steel-concrete section;
step twelve, installing steel bars, hangers and templates of the steel-concrete joint section, and pouring concrete of the steel-concrete joint section;
and thirteen, dismantling the tension section steel 201 and the transverse force-eliminating section steel 202, removing the connection and fixation of the No. 0 concrete section 101 with the first steel box girder 300 and the second steel box girder 301, and tensioning the prestressed steel beam 501 to complete the construction of the steel-concrete section.
Claims (7)
1. A mixed beam cable-stayed bridge steel-concrete joint section construction supporting system is characterized by comprising a steel box beam lower part bearing structure (100) for supporting a steel box beam;
the top of the lower bearing structure (100) of the steel box girder is provided with an upper steel-concrete connecting structure (200);
the lower bearing structure (100) of the steel box girder comprises a triangular bracket bearing support formed by welding a 0# support steel pipe (1-3), a flat connecting support rod (1-5) and an oblique support rod (1-4) end to end; the triangular bracket bearing support is sequentially provided with a transverse bridge bearing beam (104) and a longitudinal distribution structure (105) from bottom to top, and a plurality of groups of pad beams (4) are fixed at the top of the longitudinal distribution structure (105) at certain intervals;
the upper steel-concrete connecting structure (200) comprises tie section steel (201) arranged on two transverse sides of a bridge and used for temporarily fixing a 0# block concrete beam section (101) with a first steel box beam (300) and a second steel box beam (301), and transverse force-eliminating section steel (202) arranged in the transverse middle of a deviation bridge and used for eliminating transverse uneven force when concrete of the steel-concrete section is poured.
2. The system for supporting the construction of the steel-concrete combined section of the cable-stayed bridge of the hybrid beam according to claim 1, wherein the inner wall of the steel pipe at the connection part of the 0# support steel pipe (1-3) and the diagonal support rod (1-4) is reinforced by welding longitudinal ribs and circumferential ribs.
3. The construction supporting system for the steel-concrete combined section of the hybrid beam cable-stayed bridge according to claim 1, wherein the pad beam (4) is a multi-group profile steel transverse splicing structure.
4. The construction supporting system for the steel-concrete combined section of the hybrid beam cable-stayed bridge according to claim 1, characterized in that a plurality of groups of PVC pipes penetrating through a top plate and a bottom plate are pre-embedded at the position, close to the end, of the 0# concrete beam section (101) and are used for installing finish-rolled deformed steel bars (3) and forming a compression joint fixing structure.
5. The construction supporting system for the steel-concrete combined section of the hybrid beam cable-stayed bridge according to claim 4, characterized in that one end of the tie section steel (201) is fixed with the No. 0 concrete beam section (101) through reverse drawing of finish-rolled deformed steel bar (3), and the other end is welded and fixed with the corresponding first steel box beam (300) and the second steel box beam (301).
6. The system as claimed in claim 4, wherein one end of the transverse force-dissipating section steel (202) is fixed to the 0# concrete beam section (101) by counter-pulling with a finish-rolled deformed steel bar (3), and the other end is fixed to the corresponding first steel box girder (300) and second steel box girder (301) by welding.
7. The construction support system for the steel-concrete combined section of the hybrid beam cable-stayed bridge according to claim 1, wherein the longitudinal distribution structure (105) is a Bailey beam, and a plurality of groups of vertical reinforcing support section steels (1-2) are welded at the position of a vertical rod for local reinforcement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222767681.7U CN218621839U (en) | 2022-10-20 | 2022-10-20 | Steel-concrete joint section construction support system of hybrid beam cable-stayed bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222767681.7U CN218621839U (en) | 2022-10-20 | 2022-10-20 | Steel-concrete joint section construction support system of hybrid beam cable-stayed bridge |
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| Publication Number | Publication Date |
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| CN218621839U true CN218621839U (en) | 2023-03-14 |
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| CN202222767681.7U Active CN218621839U (en) | 2022-10-20 | 2022-10-20 | Steel-concrete joint section construction support system of hybrid beam cable-stayed bridge |
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