CN103866696A - Cast-in-situ support of long-cantilever zero segment of short-pylon cable-stayed bridge - Google Patents
Cast-in-situ support of long-cantilever zero segment of short-pylon cable-stayed bridge Download PDFInfo
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- CN103866696A CN103866696A CN201410120699.5A CN201410120699A CN103866696A CN 103866696 A CN103866696 A CN 103866696A CN 201410120699 A CN201410120699 A CN 201410120699A CN 103866696 A CN103866696 A CN 103866696A
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Abstract
The invention discloses a cast-in-situ support of a long-cantilever zero segment of a short-pylon cable-stayed bridge. The cast-in-situ support is characterized in that bearing platform embedded steel plates are arranged on the top of a concrete bearing platform, and steel tube stand columns are erected on the bearing platform embedded steel plates; I-steel longitudinal bearing beams are arranged on the tops of the steel tube stand columns; pier body embedded steel plates are arranged at different height positions of pier bodies respectively; profile steel brackets are embedded into fixed positions the pier bodies; stand column connecting U-steel pieces are arranged between the pier body embedded steel plates and the steel tube stand columns and between adjacent steel tube stand columns respectively and located at different height positions; bracket connecting U-steel pieces are arranged between the pier body embedded steel plates and the profile steel brackets; an I-steel transverse distribution beam is arranged on the tops of the profile steel brackets and the tops of the I-steel longitudinal bearing beams, the top of the I-steel transverse distribution beam is paved with longitudinal distribution beams, and a steel formwork system is arranged on the longitudinal distribution beams. The cast-in-situ support has the advantages that a cantilever is long, and the cast-in-situ support is strong in loading capacity and high in rigidity, makes construction easy and convenient and is particularly suitable for construction in a water area below a bridge or construction at a high position away from the ground.
Description
Technical field
The present invention relates to bridge construction support, be specifically related to No. 0 subsection cast-in-situ support of a kind of low-pylon cable-stayed bridge long cantilever.
Background technology
Low-pylon cable-stayed bridge also claims partial cable-stayed bridge, is a kind of novel bridge structure between continuous girder bridge and traditional cable stayed bridge.Cable stayed bridge tower height is lower, and beam body rigidity is larger, and suspension cable is relatively little to the contribution of bearing capacity.No. zero sections of low-pylon cable-stayed bridge is positioned at the root of girder, is long cantilever structure, is also the intersection point of pier shaft and Sarasota, and stressed very complicated, its construction quality plays vital effect to the structural safety of full-bridge, and directly affects the construction of follow-up position engineering.The cast-in-place support structure of No. 0 sections of long cantilever has significant impact to construction safety and workmanship.
In prior art, for long cantilever, No. zero subsection cast-in-situ construction adopts console mode full hall scaffold conventionally, or on riverbed or cushion cap, set up structure stand platform, rack platform generally adopts steel pipe post, and lay at steel pipe post top longitudinally and transverse distribution beam etc. forms whole support system structure.But, when bridge be positioned at waters or when higher apart from ground, adopt console mode full hall scaffold constructional difficulties, cost is large and safety factor is low; Adopt steel pipe support support system structure, because girder frange plate is long, need in riverbed, beat steel pipe pile and set up rack platform, in riverbed, the destabilizing factor such as stability and sedimentation of steel pipe pile causes rack bearing power control difficulty, and working measure take very high, construction cost increase.
Summary of the invention
The present invention is for avoiding the existing weak point of above-mentioned prior art, a kind of good integrity is provided, stability is high, rigidity is strong, span is large, easy No. zero subsection cast-in-situ support of low-pylon cable-stayed bridge long cantilever of installation and removal, to be applicable under bridge as waters or apart from constructing under the higher environment in ground.
The present invention is that technical solution problem adopts following technical scheme:
The design feature of No. zero subsection cast-in-situ support of low-pylon cable-stayed bridge long cantilever of the present invention is:
Top at concrete bearing platform arranges cushion cap pre-embedded steel slab by U-shaped reinforcing bar, a vertical steel pipe post on described cushion cap pre-embedded steel slab; At described steel pipe post top, the longitudinal spandrel girder of i iron is set;
On the differing heights position of pier shaft, by U-shaped reinforcing bar, pier shaft pre-embedded steel slab is set respectively; At the pre-buried profile steel bracket in the permanent position of pier shaft; Unloading sand cylinder is set on described profile steel bracket;
Between described pier shaft pre-embedded steel slab and steel pipe post, and between adjacent steel pipe post, be in and on differing heights position, column be set respectively and connect channel-section steel; Between described pier shaft pre-embedded steel slab and profile steel bracket, bracket is set and is connected channel-section steel;
At the top of described profile steel bracket and the longitudinal spandrel girder of i iron, i iron transverse distribution beam is set, lays longitudinal distribution beam at the top of described i iron transverse distribution beam, described steel form system is arranged in described longitudinal distribution beam.
The design feature of No. zero subsection cast-in-situ support of low-pylon cable-stayed bridge long cantilever of the present invention is also:
Described profile steel bracket is integral solder part, comprises the support level bar that is in the stressed horizon bar of top and is in below; Between the outer end of stressed horizon bar and support level bar, be the large brace of gusseted, be gusseted and be welded with little brace between the inner and large brace of stressed horizon bar, the angle of inclination of described large brace is 45 °-50 °.
Fixing welding between described steel pipe post and cushion cap pre-embedded steel slab.
Described column connects between channel-section steel and steel pipe post, and bracket connects between channel-section steel and profile steel bracket for fixing welding.
Between described i iron transverse distribution beam and profile steel bracket, and adopt U-shaped snap ring to be fixedly connected with at described i iron transverse distribution beam with the interconnecting part of the longitudinal spandrel girder of i iron.
Described longitudinal distribution beam comprises the longitudinal distribution beam of sleeper that is positioned at base section, girder case chamber and the longitudinal distribution beam of i iron that is positioned at girder web plate district and flange area.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention arranges steel pipe post at concrete bearing platform to support and the strutting system that combines at the pre-buried profile steel bracket of pier shaft, and its arm length, simple in structure, stressed power transmission route is clear and definite, load ability to bear is large;
2, the present invention utilizes existing concrete bearing platform to set up steel pipe post formation support system, has evaded the security risk of the poor stability of driving piles and save working measure expense in riverbed;
3, the present invention is relatively low in conjunction with girder frange plate weight, adopts powerful i iron as transverse distribution beam and longitudinal distribution beam braced wing listrium construction weight, and support Design is reasonable, and it is convenient to implement;
4, the present invention, at bridge pier front pier shaft integral built-in profile steel bracket, has evaded the conventional security risk that profile steel bracket rod member weld defect causes of carrying out after pier shaft pre-embedded steel slab.
Accompanying drawing explanation
Fig. 1 is facade structures schematic diagram of the present invention;
Fig. 2 is the A-A sectional drawing of Fig. 1;
Fig. 3 is the B-B sectional drawing of Fig. 1;
Fig. 4 is the C-C sectional drawing of Fig. 1.
Number in the figure: 1 concrete bearing platform; 2 cushion cap pre-embedded steel slabs; 3 pier shafts; 4 pier shaft pre-embedded steel slabs; 5 profile steel brackets; 6 steel pipe posts; 7a column connects channel-section steel; 7b bracket connects channel-section steel; The longitudinal spandrel girder of 8 i iron; 9 unloading sand cylinders; 10 i iron transverse distribution beams; The longitudinal distribution beam of 11a i iron; The longitudinal distribution beam of 11b sleeper; 12 steel form systems; 13 No. zero sections; 14 Sarasotas; The large brace of 5a; The little brace of 5b; 5c support level bar; The stressed horizon bar of 5d.
The specific embodiment
In the present embodiment, the form of structure of No. zero subsection cast-in-situ support of low-pylon cable-stayed bridge long cantilever is:
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, by U-shaped reinforcing bar, cushion cap pre-embedded steel slab 2 is set at the top of concrete bearing platform 1, a vertical steel pipe post 6 on cushion cap pre-embedded steel slab 2; The longitudinal spandrel girder 8 of i iron is set at steel pipe post 6 tops; On the differing heights position of pier shaft 3, by U-shaped reinforcing bar, pier shaft pre-embedded steel slab 4 is set respectively; At the pre-buried profile steel bracket 5 in the permanent position of pier shaft 3; Unloading sand cylinder 9 is set on profile steel bracket 5; Between pier shaft pre-embedded steel slab 4 and steel pipe post 6, and between adjacent steel pipe post 6, be in and on differing heights position, column be set respectively and connect channel-section steel 7a; Between pier shaft pre-embedded steel slab 4 and profile steel bracket 5, bracket is set and is connected channel-section steel 7b; Top at profile steel bracket 5 and the longitudinal spandrel girder 8 of i iron arranges i iron transverse distribution beam 10, lays longitudinal distribution beam at the top of i iron transverse distribution beam 10, and steel form system 12 is arranged in longitudinal distribution beam.
In concrete enforcement, corresponding form of structure comprises:
Shown in Fig. 3, profile steel bracket 5 is set for integral solder part, comprises the support level bar 5c that is in the stressed horizon bar 5d of top and is in below; Between the outer end of stressed horizon bar 5d and support level bar 5c, be the large brace 5a of gusseted, be gusseted and be welded with little brace 5b between the inner and large brace 5a of stressed horizon bar 5d, wherein, the angle of inclination of large brace 5a is 45 °-50 °.Junction between each member adopts steel plate to carry out the reinforcement of preventing local unstability.
Fixing welding between steel pipe post 6 and cushion cap pre-embedded steel slab 2, every side arranges respectively four steel pipe posts; Column connects between channel-section steel 7a and steel pipe post 6, and bracket connects between channel-section steel 7b and profile steel bracket 5 for fixing welding; Between i iron transverse distribution beam 10 and profile steel bracket 5, and adopt U-shaped snap ring to be fixedly connected with at i iron transverse distribution beam 10 with the interconnecting part of the longitudinal spandrel girder 8 of i iron.
As shown in Figure 1, longitudinally distribution beam comprises the longitudinal distribution beam 11b of sleeper that is positioned at base section, girder case chamber and the longitudinal distribution beam 11a of i iron that is positioned at girder web plate district and flange area.
In the present embodiment, No. zero sections of low-pylon cable-stayed bridge long cantilever is constructed according to the following procedure:
The first step, concreting cushion cap 1 and concrete pier shaft 3, and in concrete bearing platform 1 and pier shaft 3, distinguish pre-buried cushion cap pre-embedded steel slab 2, pier shaft pre-embedded steel slab 4 and profile steel bracket 5;
Second step, on cushion cap pre-embedded steel slab 2 vertical steel pipe post 6, connect channel-section steel 7a by between steel pipe post 6 and pier shaft 3 with column, and be connected and fixed between adjacent steel pipe post 6;
The 3rd step, place Two bors d's oeuveres longitudinal i iron spandrel girder 8 at steel pipe post 6 top-slittings;
The 4th step, on profile steel bracket 5, place unloading sand cylinder 9, unloading sand cylinder is to be conducive to template dismounting, profile steel bracket 5 is being connected with pier shaft pre-embedded steel slab 4 connecting channel-section steel 7b to pier shaft front with bracket along bridge;
The 5th step, on the longitudinal spandrel girder 8 in steel pipe post top and profile steel bracket 5, lay i iron as transverse distribution beam 10, Lay interval is 0.6m, all i iron transverse distribution beams 10 push up longitudinal spandrel girder 8 interconnecting parts with profile steel bracket 5 and steel pipe post and adopt U-shaped snap ring to fix, and place mat is steady;
The 6th step, on place mat longitudinal distribution beam 11b or the longitudinal distribution beam 11a of the i iron basis as installation form system 12 that lays railway sleepers on i iron transverse distribution beam 10 stably;
The 7th step, on the longitudinal distribution beam 11b of sleeper and the longitudinal distribution beam 11a of i iron, lay template system 12, complete the construction of the support of No. zero sections 13 of low-pylon cable-stayed bridge.
The product that is sizing processing to the positive pre-buried profile steel bracket 5 of pier shaft along bridge, adopts Two bors d's oeuveres i iron to be welded, and carries out the steel plate processing of putting more energy in the i iron flange area of every rod member junction, prevents local buckling.
Direction across bridge pier shaft both sides adopt steel pipe post as support, and Two bors d's oeuveres i iron is placed as spandrel girder in top, and the every side of steel pipe post arranges four, and spacing 2m adopts channel-section steel to be connected between steel pipe post and between steel pipe post and pier shaft, strengthens its resistance to overturning.
I iron distribution beam is laid on the spandrel girder on steel pipe post top and profile steel bracket top, spacing 0.6m, and the every side of pier shaft arranges five, and i iron transverse distribution beam and profile steel bracket and steel pipe post top spandrel girder intersection adopt U-shaped snap ring to fix, and place mat is steady.
On place mat longitudinal distribution beam and the longitudinal distribution beam of the i iron basis as installation form system that lays railway sleepers on i iron transverse distribution beam stably, base section, girder case chamber arranges the longitudinal distribution beam of sleeper, spacing 0.3m, the longitudinal distribution beam of i iron is set in girder web plate district, spacing 0.3m, the longitudinal distribution beam of i iron is set, spacing 0.6m in flange area.
After No. zero sections concreting of low-pylon cable-stayed bridge long cantilever completes, then carry out Sarasota 14 and other beam section cantilever casting construction.
Claims (6)
1. No. zero subsection cast-in-situ support of low-pylon cable-stayed bridge long cantilever, is characterized in that:
Top at concrete bearing platform (1) arranges cushion cap pre-embedded steel slab (2) by U-shaped reinforcing bar, at the upper vertical steel pipe post (6) of described cushion cap pre-embedded steel slab (2); At described steel pipe post (6) top, the longitudinal spandrel girder of i iron (8) is set;
On the differing heights position of pier shaft (3), by U-shaped reinforcing bar, pier shaft pre-embedded steel slab (4) is set respectively; At the pre-buried profile steel bracket in the permanent position of pier shaft (3) (5); Unloading sand cylinder (9) is set on described profile steel bracket (5);
Between described pier shaft pre-embedded steel slab (4) and steel pipe post (6), and between adjacent steel pipe post (6), be in and on differing heights position, column be set respectively and connect channel-section steel (7a); Between described pier shaft pre-embedded steel slab (4) and profile steel bracket (5), bracket is set and is connected channel-section steel (7b);
Top at described profile steel bracket (5) and the longitudinal spandrel girder of i iron (8) arranges i iron transverse distribution beam (10), longitudinal distribution beam is laid at top at described i iron transverse distribution beam (10), and described steel form system (12) is arranged in described longitudinal distribution beam.
2. No. zero subsection cast-in-situ support of low-pylon cable-stayed bridge long cantilever according to claim 1, it is characterized in that: described profile steel bracket (5) is integral solder part, comprise the support level bar (5c) that is in the stressed horizon bar (5d) of top and is in below; Between the outer end of stressed horizon bar (5d) and support level bar (5c), be the large brace of gusseted (5a), between the inner of stressed horizon bar (5d) and large brace (5a), be gusseted and be welded with little brace (5b), the angle of inclination of described large brace (5a) is 45 °-50 °.
3. No. zero subsection cast-in-situ support of low-pylon cable-stayed bridge long cantilever according to claim 1, is characterized in that: fixing welding between described steel pipe post (6) and cushion cap pre-embedded steel slab (2).
4. No. zero subsection cast-in-situ support of low-pylon cable-stayed bridge long cantilever according to claim 1, it is characterized in that: described column connects between channel-section steel (7a) and steel pipe post (6), and bracket connects between channel-section steel (7b) and profile steel bracket (5) for fixing welding.
5. No. zero subsection cast-in-situ support of low-pylon cable-stayed bridge long cantilever according to claim 1, it is characterized in that: between described i iron transverse distribution beam (10) and profile steel bracket (5), and adopt U-shaped snap ring to be fixedly connected with at described i iron transverse distribution beam (10) with the interconnecting part of the longitudinal spandrel girder of i iron (8).
6. No. zero subsection cast-in-situ support of low-pylon cable-stayed bridge long cantilever according to claim 1, is characterized in that: described longitudinal distribution beam comprises the longitudinal distribution beam of sleeper (11b) that is positioned at base section, girder case chamber and the longitudinal distribution beam of i iron (11a) that is positioned at girder web plate district and flange area.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410120699.5A CN103866696A (en) | 2014-03-26 | 2014-03-26 | Cast-in-situ support of long-cantilever zero segment of short-pylon cable-stayed bridge |
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| CN201410120699.5A CN103866696A (en) | 2014-03-26 | 2014-03-26 | Cast-in-situ support of long-cantilever zero segment of short-pylon cable-stayed bridge |
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Cited By (8)
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| CN104594204A (en) * | 2015-01-29 | 2015-05-06 | 中铁十九局集团轨道交通工程有限公司 | Construction supporting system for hill type U beam of viaduct of urban light rail and construction method |
| CN105625193A (en) * | 2016-03-14 | 2016-06-01 | 中铁二十四局集团安徽工程有限公司 | Whole-span cast-in-place beam inverted-triangle formwork supporting frame and construction method thereof |
| CN107012796A (en) * | 2017-05-25 | 2017-08-04 | 山东大学 | A kind of wide, bracket of No. zero block construction of squat pier box beam and construction method |
| CN108589551A (en) * | 2018-06-07 | 2018-09-28 | 中交路桥华南工程有限公司 | Pier stud 0# beam section cast-in-place supports |
| CN109537468A (en) * | 2018-12-18 | 2019-03-29 | 广西路桥工程集团有限公司 | Cast-in-place support construction method in a kind of ultrahigh water |
| CN110629678A (en) * | 2019-10-23 | 2019-12-31 | 中国电建集团成都勘测设计研究院有限公司 | Cable-stayed bridge's cable auxiliary stand |
| CN111455855A (en) * | 2020-04-16 | 2020-07-28 | 中交一公局第四工程有限公司 | Construction process of main bridge of double-tower single-cable-plane short-tower cable-stayed bridge |
| CN113235439A (en) * | 2021-05-19 | 2021-08-10 | 安徽省路港工程有限责任公司 | Construction method of bridge main pier composite cast-in-place support 0# block formwork system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104594204A (en) * | 2015-01-29 | 2015-05-06 | 中铁十九局集团轨道交通工程有限公司 | Construction supporting system for hill type U beam of viaduct of urban light rail and construction method |
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| CN107012796A (en) * | 2017-05-25 | 2017-08-04 | 山东大学 | A kind of wide, bracket of No. zero block construction of squat pier box beam and construction method |
| CN108589551A (en) * | 2018-06-07 | 2018-09-28 | 中交路桥华南工程有限公司 | Pier stud 0# beam section cast-in-place supports |
| CN109537468A (en) * | 2018-12-18 | 2019-03-29 | 广西路桥工程集团有限公司 | Cast-in-place support construction method in a kind of ultrahigh water |
| CN109537468B (en) * | 2018-12-18 | 2020-06-02 | 广西路桥工程集团有限公司 | Construction method of cast-in-situ support in ultrahigh water |
| CN110629678A (en) * | 2019-10-23 | 2019-12-31 | 中国电建集团成都勘测设计研究院有限公司 | Cable-stayed bridge's cable auxiliary stand |
| CN111455855A (en) * | 2020-04-16 | 2020-07-28 | 中交一公局第四工程有限公司 | Construction process of main bridge of double-tower single-cable-plane short-tower cable-stayed bridge |
| CN111455855B (en) * | 2020-04-16 | 2021-11-12 | 中交一公局第四工程有限公司 | Construction process of main bridge of double-tower single-cable-plane short-tower cable-stayed bridge |
| CN113235439A (en) * | 2021-05-19 | 2021-08-10 | 安徽省路港工程有限责任公司 | Construction method of bridge main pier composite cast-in-place support 0# block formwork system |
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Application publication date: 20140618 |