CN103205930B - Structure for continuous transformation of existing simply supported hollow slab girder bridge and construction method of structure - Google Patents
Structure for continuous transformation of existing simply supported hollow slab girder bridge and construction method of structure Download PDFInfo
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Abstract
The invention relates to a structure for continuous transformation of an existing simply supported hollow slab girder bridge. The structure comprises two hollow slabs and a pier of the existing simply supported hollow slab girder bridge, wherein part of top plates and part of web plates of the two adjacent hollow slabs on the top of the pier are removed through chiseling along the bridge direction; a Y-shaped seam is formed between the end parts of the two chiseled hollow slabs; reinforcing steel bars are laid and concrete is poured in the Y-shaped seam to form a continuous section connected with the two hollow slabs; and a bridge deck pavement is poured on the two hollow slabs and the continuous section again. The invention also relates to a construction method for the continuous transformation of the simply supported hollow slab girder bridge. According to the invention, a feasible and effective guidance method is provided for the continuous transformation of the existing simply supported hollow slab girder bridge, complex construction caused by prestress is avoided, and splits are effectively avoided. The structure is favorable in integrity, has good quake-proof and collapse-proof effects in earthquakes, and has the advantages of simplicity and convenience in construction and strong durability.
Description
Technical field
The present invention relates to technical field of civil, especially a kind of structure of existing freely-supported Hollow Slab Beam Bridge serialization transformation and construction method thereof.
Background technology
Simply supported girder bridge belongs to statically determinate structrue, it have stressed clear and definite, simple structure, easy construction, maintenance easily and the differential settlement of ground do not produce the features such as additional internal force, be applicable to the situation that geological conditions is relatively poor.Hollowcore slab simply supported girder bridge is built more in China, and porous simply supported girder bridge is the malformation that adaptive temperature change and load action cause, and usually will arrange shrinkage joint on each bridge pier (platform).Bridge expanssion joint is the position being subject to destruction and more difficult repairing in bridge construction most.Units concerned of China will once be investigated the present situation of the 242 bridge block expansion gap devices that it is administered at the beginning of 1989 end of the year to nineteen ninety, and what investigation result display bridge expansion joint installation was intact is 62, and only account for 26% of investigation sum, the extent of damage is quite serious.The destruction at shrinkage joint will reduce globality and the continuity of bridge floor to a great extent, causes very large vehicular impact load, worsens driving condition and traffic safety, and sharply reduces the application life of bridge.
In order to make bridge construction have preferably performance continuously, late 1970s has people to propose the idea of " simply supported girder bridge serialization ".Simply supported girder bridge not only effectively can reduce or eliminate shrinkage joint after serialization, obtains longer continuous deck, but also has dead load freely-supported, mobile load continuous print design feature.The existing building method realizing simply supported girder bridge serialization comprises at present: bridge floor (plate) continuously, bridge floor (plate) continuously+wet seam and bridge floor (plate) continuously+wet seam+prestressing force etc.Though first two building method can improve the phenomenon of bearing place bridge floor cracking to a certain extent, but because the continuous space of connector area is less, and the tensile strength of packing material (as concrete) is lower, therefore cannot fundamentally resist simply supported beam continuously after the hogging moment effect that produces in joint, namely can cause the cracking of bridge floor equally; And bridge floor (plate) is though continuously+wet seam+prestressed building method avoids the cracking of bridge floor by applying local prestressing force, but the method construction is complicated, Shi Hanzhang easily causes stress raisers among a small circle, and loss of prestress is also comparatively large, and for more difficult in remake old bridge.
Summary of the invention
Lack the deficiency of serialization modification measures to overcome existing freely-supported Hollow Slab Beam Bridge, technical problem to be solved by this invention is to provide a kind of structure and construction method thereof of existing freely-supported Hollow Slab Beam Bridge serialization transformation.
In order to solve the problems of the technologies described above, technical scheme of the present invention is: a kind of structure of existing freely-supported Hollow Slab Beam Bridge serialization transformation, comprise hollowcore slab and the bridge pier of existing freely-supported Hollow Slab Beam Bridge, the adjacent two pieces of hollowcore slabs of described pier coping portion respectively along bridge to cutting partial panels and part web, a Y shape seam is formed between two pieces of hollowcore slab ends after cutting, be laid with reinforcing bar in described Y shape seam and build concrete to form the continuous segment of connection two pieces of hollowcore slabs, described two pieces of hollowcore slabs and continuous segment build deck paving again.
Further, between described two pieces of hollowcore slab top boards to cut length be m, m value is the scope that hogging moment is arranged at continuous rear abutment top.
Further, described two pieces of hollowcore slab web upper ends to cut height value be the distance of top board to the stressed axis of hollowcore slab, described two pieces of hollowcore slab web upper ends along bridge to the length value that cuts be cut height and cut length and form the distance of 1:3 gradient gradual transition to top board.
Further, what the cutting of described two pieces of hollowcore slab web bottoms highly equaled upper end cuts height, described two pieces of hollowcore slab web bottoms along bridge to the length value that cuts be cut height and cut length and form the distance of 1:3 gradient gradual transition to base plate.
Further, the width that cuts of described two pieces of hollowcore slab web both side ends is T=B/4, B is hollowcore slab width of main beam, and the length value that cuts of described two pieces of hollowcore slab web both side ends is cut width and cut length to form the distance of 1:4 gradient gradual transition to hollowcore slab web both sides.
Further, original reinforcing bar is all retained when described two pieces of hollowcore slabs cut partial panels and part web.
Further, between described two blocks of hollowcore slab webs along bridge to build length be n=2H, H is hollowcore slab girder height.
Further, described reinforcing bar comprises connecting reinforcement, negative reinforcement and stirrup.
Further, described concrete is slightly expanded concrete.
Simultaneously, the present invention also provides a kind of construction method of existing freely-supported Hollow Slab Beam Bridge serialization transformation, carry out according to the following steps: (1) cuts existing deck paving: the deck paving cutting existing freely-supported Hollow Slab Beam Bridge, carry out safety measure when cutting to avoid causing damage to hollowcore slab; (2) cut part hollow plate: the partial panels and the part web that cut hollowcore slab by designing requirement, form a Y shape seam between two pieces of hollowcore slab ends after cutting, original reinforcing bar should be retained after cutting so that follow-up colligation welded reinforcement; (3) continuous segment is built: the bottom between adjacent two pieces of hollowcore slabs is built mortar and follow-uply set up template to facilitate, template is set up at the top board cut and web position place, dowel, colligation negative reinforcement and stirrup is laid in Y shape seam, and toward monobloc cast concrete in Y shape seam to form the continuous segment of connection two pieces of hollowcore slabs; (4) again deck paving is built: abundant plucking concrete interface before building, anchor bar is implanted between hollowcore slab top board and deck paving, make continuous improved hollow slab bridge panel and hollowcore slab stressed better, two pieces of hollowcore slabs and continuous segment build deck paving again.
Further, in step (2), between described two pieces of hollowcore slab top boards to cut length be m, m value is the scope that hogging moment is arranged at continuous rear abutment top; Described two pieces of hollowcore slab web upper ends to cut height value be the distance of top board to the stressed axis of hollowcore slab, described two pieces of hollowcore slab web upper ends along bridge to the length value that cuts be cut height and cut length and form the distance of 1:3 gradient gradual transition to top board.
Further, in step (2), what the cutting of described two pieces of hollowcore slab web bottoms highly equaled upper end cuts height, described two pieces of hollowcore slab web bottoms along bridge to the length value that cuts be cut height and cut length and form the distance of 1:3 gradient gradual transition to base plate.
Further, in step (2), the width that cuts of described two pieces of hollowcore slab web both side ends is T=B/4, B is hollowcore slab width of main beam, and the length value that cuts of described two pieces of hollowcore slab web both side ends is cut width and cut length to form the distance of 1:4 gradient gradual transition to hollowcore slab web both sides.
Further, in step (3), between described two blocks of hollowcore slab webs along bridge to build length be n=2H, H is hollowcore slab girder height, described concrete is slightly expanded concrete.
Compared with prior art, the present invention has following beneficial effect: the structure of this existing freely-supported Hollow Slab Beam Bridge serialization transformation and construction method thereof are that existing freely-supported blank board bridge serialization transformation provides feasible, effective guidance method, can avoid because adopt the prestressing force loaded down with trivial details construction that bring along bridge to serialization by the method, and effectively can avoid the appearance in crack, girder can be held together continuously by top board, globality is relatively good.Due to good integrity, therefore when earthquake occurs, anti seismic efficiency is relatively good; And girder falling effect is also relatively good, there is the advantages such as construction is simple and convenient, durability is comparatively strong, improvement cost is lower.
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Accompanying drawing explanation
Fig. 1 is the elevation of existing freely-supported Hollow Slab Beam Bridge.
Elevation when Fig. 2 is existing freely-supported Hollow Slab Beam Bridge serialization arrangement of reinforcement.
Fig. 3 is the profile at a-a place in Fig. 2.
Fig. 4 is the profile at b-b place in Fig. 2.
Fig. 5 is the profile at c-c place in Fig. 2.
Fig. 6 is the improved elevation of existing freely-supported Hollow Slab Beam Bridge serialization.
Fig. 7 is the profile at d-d place in Fig. 6.
Fig. 8 is the profile at e-e place in Fig. 6.
Fig. 9 is the profile at f-f place in Fig. 6.
1-hollowcore slab in figure, 11-top board, 12-web, the stressed axis of 13-, 14-base plate, 2-bridge pier, 3-deck paving, 4-shrinkage joint, 5-Y shape is stitched, 6-mortar, 7-dowel, 8-negative reinforcement, 9-stirrup, 10-continuous segment, 15-U shape anchor bar.
Detailed description of the invention
As shown in Fig. 1 ~ 9, a kind of structure of existing freely-supported Hollow Slab Beam Bridge serialization transformation, comprise hollowcore slab 1 and the bridge pier 2 of existing freely-supported Hollow Slab Beam Bridge, the adjacent two pieces of hollowcore slabs 1 in described bridge pier 2 top respectively along bridge to cutting partial panels 11 and part web 12, a Y shape seam 5 is formed between two pieces of hollowcore slab 1 ends after cutting, be laid with reinforcing bar in described Y shape seam 5 and build concrete to form the continuous segment 10 of connection two pieces of hollowcore slabs 1, described two pieces of hollowcore slabs 1 and continuous segment 10 build deck paving 3 again.
In the present embodiment, between described two pieces of hollowcore slab 1 top boards 11 to cut length be m, m value is the scope that hogging moment is arranged at continuous rear abutment 2 top.The height value that cuts of described two pieces of hollowcore slab 1 web 12 upper ends is top board 11 distance to the stressed axis of hollowcore slab 1, described two pieces of hollowcore slab 1 web 12 upper ends along bridge to the length value that cuts be cut height and cut length and form the distance of 1:3 gradient gradual transition to top board.What the cutting of described two pieces of hollowcore slab web bottoms highly equaled upper end cuts height, described two pieces of hollowcore slab web bottoms along bridge to the length value that cuts be cut height and cut length and form the distance of 1:3 gradient gradual transition to base plate.The width that cuts of described two pieces of hollowcore slab web both side ends is T=B/4, B is hollowcore slab width of main beam, and the length value that cuts of described two pieces of hollowcore slab web both side ends is cut width and cut length to form the distance of 1:4 gradient gradual transition to hollowcore slab web both sides.Described two pieces of hollowcore slabs 1 all retain original reinforcing bar when cutting partial panels 11 and part web 12.Between described two blocks of hollowcore slab 1 webs 12 along bridge to build length be n=2H, H is hollowcore slab girder height.
In the present embodiment, described reinforcing bar comprises connecting reinforcement, negative reinforcement 8 and stirrup 9, and described concrete is slightly expanded concrete.
As shown in Fig. 1 ~ 9, a kind of construction method of existing freely-supported Hollow Slab Beam Bridge serialization transformation, carry out according to the following steps:
(1) cut existing deck paving: the deck paving 3 cutting existing freely-supported Hollow Slab Beam Bridge, carry out safety measure when cutting to avoid causing damage to hollowcore slab 1;
(2) part hollow plate is cut: the partial panels 11 and the part web 12 that cut hollowcore slab 1 by designing requirement, should calculate before cutting when hollowcore slab 1 cuts partial panels 11 and part web 12 and whether meet naked beam stress requirement to determine whether needs stent support, form a Y shape seam 5 between two pieces of hollowcore slab 1 ends after cutting, original reinforcing bar should be retained after cutting so that follow-up colligation welded reinforcement;
(3) continuous segment is built: the bottom between adjacent two pieces of hollowcore slabs 1 is built mortar 6 and follow-uply set up template to facilitate, template is set up at the top board 11 cut and web 12 position, dowel 7, colligation negative reinforcement 8 and stirrup 9 is laid in Y shape seam 5, and toward monobloc cast concrete in Y shape seam 5 to form the continuous segment 10 of connection two pieces of hollowcore slabs 1;
(4) again deck paving is built: abundant plucking concrete interface before building, U-shaped anchor bar 15 is implanted between hollowcore slab 1 top board 11 and deck paving 3, make continuous improved hollow slab bridge panel and hollowcore slab 1 stressed better, two pieces of hollowcore slabs 1 and continuous segment 10 build deck paving 3 again.
In step (2), between described two pieces of hollowcore slab 1 top boards 11 to cut length be m, m value is the scope that hogging moment is arranged at continuous rear abutment 2 top; Should cut in strict accordance with jumping position when cutting partial panels 11, during construction, tackle that key position carries out straining, stress monitor, construction should be stopped if noting abnormalities; Original reinforcing bar should be retained, so that follow-up reinforcing bar binding after cutting partial panels 11.
In step (2), the height value that cuts of described two pieces of hollowcore slab 1 web 12 upper ends is top board 11 distance to the stressed axis of hollowcore slab 1, described two pieces of hollowcore slab 1 web 12 upper ends along bridge to the length value that cuts be cut height and cut length and form the distance of 1:3 gradient gradual transition to top board.In order to resist positive bending moment and avoid stress to concentrate, what the cutting of described two pieces of hollowcore slab web bottoms highly equaled upper end cuts height, described two pieces of hollowcore slab web bottoms along bridge to the length value that cuts be cut height and cut length and form the distance of 1:3 gradient gradual transition to base plate.Wet seam and hollowcore slab 1 top board 11 of described bridge pier 2 top adopts gradual change height section to increase the shear stiffness of this position, arranges negative reinforcement 8 to improve moment of flexure supporting capacity in this gradual change height section.
In step (2), in order to increase the effective web width of hollowcore slab and then increase shear resistant capacity, the width that cuts of described two pieces of hollowcore slab web both side ends is T=B/4, B is hollowcore slab width of main beam, and the length value that cuts of described two pieces of hollowcore slab web both side ends is cut width and cut length to form the distance of 1:4 gradient gradual transition to hollowcore slab web both sides.
In step (3), between described two blocks of hollowcore slab 1 webs 12 along bridge to build length namely wet seam builds length be n=2H, H be hollowcore slab girder height; In end dabbing process before building, and implant connecting reinforcement; Wet seam bottom is provided with reinforcing bar, can increase the rigidity of continuous segment.
In step (3), in order to enable new-old concrete better co-operation, connecting reinforcement is implanted at new-old concrete intersection.By setting up template, colligation welded reinforcement, common concreting at web 12 and top board 11 place, be an entirety to increase holistic resistant behavior.In order to reduce the difference of the shrinkage and creep of new-old concrete, it is slightly expanded concrete that hollowcore slab 1 cuts the concrete that part builds.
In step (4), described deck paving 3 adopts the high performance concrete of some tensions, such as polypropylene fiber concrete.
The present invention is not limited to above-mentioned preferred forms, and anyone can draw other various forms of existing freely-supported Hollow Slab Beam Bridge serialization forms of modification under enlightenment of the present invention.All equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. the structure of an existing freely-supported Hollow Slab Beam Bridge serialization transformation, comprise hollowcore slab and the bridge pier of existing freely-supported Hollow Slab Beam Bridge, it is characterized in that: the adjacent two pieces of hollowcore slabs of described pier coping portion respectively along bridge to cutting partial panels and part web, described two pieces of hollowcore slabs all retain original reinforcing bar when cutting partial panels and part web, a Y shape seam is formed between two pieces of hollowcore slab ends after cutting, be laid with reinforcing bar in described Y shape seam and build concrete to form the continuous segment of connection two pieces of hollowcore slabs, described two pieces of hollowcore slabs and continuous segment build deck paving again.
2. the structure of a kind of existing freely-supported Hollow Slab Beam Bridge serialization transformation according to claim 1, is characterized in that: between described two pieces of hollowcore slab top boards to cut length be m, m value is the scope that hogging moment is arranged at continuous rear abutment top.
3. the structure of a kind of existing freely-supported Hollow Slab Beam Bridge serialization transformation according to claim 1 and 2, it is characterized in that: described two pieces of hollowcore slab web upper ends to cut height value be the distance of top board to the stressed axis of hollowcore slab, described two pieces of hollowcore slab web upper ends along bridge to the length value that cuts be cut height and cut length and form the distance of 1:3 gradient gradual transition to top board.
4. the structure of a kind of existing freely-supported Hollow Slab Beam Bridge serialization transformation according to claim 3, it is characterized in that: what the cutting of described two pieces of hollowcore slab web bottoms highly equaled upper end cuts height, described two pieces of hollowcore slab web bottoms along bridge to the length value that cuts be cut height and cut length and form the distance of 1:3 gradient gradual transition to base plate.
5. the structure of a kind of existing freely-supported Hollow Slab Beam Bridge serialization transformation according to claim 4, it is characterized in that: the width that cuts of described two pieces of hollowcore slab web both side ends is T=B/4, B is hollowcore slab width of main beam, and the length value that cuts of described two pieces of hollowcore slab web both side ends is cut width and cut length to form the distance of 1:4 gradient gradual transition to hollowcore slab web both sides.
6. the structure of a kind of existing freely-supported Hollow Slab Beam Bridge serialization transformation according to claim 1, is characterized in that: between described two blocks of hollowcore slab webs along bridge to build length be n=2H, H is hollowcore slab girder height.
7. the structure of a kind of existing freely-supported Hollow Slab Beam Bridge serialization transformation according to claim 1, it is characterized in that: described reinforcing bar comprises connecting reinforcement, negative reinforcement and stirrup, described concrete is slightly expanded concrete.
8. a construction method for existing freely-supported Hollow Slab Beam Bridge serialization transformation, is characterized in that, carry out according to the following steps:
(1) cut existing deck paving: the deck paving cutting existing freely-supported Hollow Slab Beam Bridge, carry out safety measure when cutting to avoid causing damage to hollowcore slab;
(2) cut part hollow plate: the partial panels and the part web that cut hollowcore slab by designing requirement, form a Y shape seam between two pieces of hollowcore slab ends after cutting, original reinforcing bar should be retained after cutting so that follow-up colligation welded reinforcement;
(3) continuous segment is built: the bottom between adjacent two pieces of hollowcore slabs is built mortar and follow-uply set up template to facilitate, template is set up at the top board cut and web position place, dowel, colligation negative reinforcement and stirrup is laid in Y shape seam, and toward monobloc cast concrete in Y shape seam to form the continuous segment of connection two pieces of hollowcore slabs;
(4) again deck paving is built: abundant plucking concrete interface before building, anchor bar is implanted between hollowcore slab top board and deck paving, make continuous improved hollow slab bridge panel and hollowcore slab stressed better, two pieces of hollowcore slabs and continuous segment build deck paving again.
9. the construction method of a kind of existing freely-supported Hollow Slab Beam Bridge serialization transformation according to claim 8, it is characterized in that: in step (2), between described two pieces of hollowcore slab top boards to cut length be m, m value is the scope that hogging moment is arranged at continuous rear abutment top; Described two pieces of hollowcore slab web upper ends to cut height value be the distance of top board to the stressed axis of hollowcore slab, described two pieces of hollowcore slab web upper ends along bridge to the length value that cuts be cut height and cut length and form the distance of 1:3 gradient gradual transition to top board; What the cutting of described two pieces of hollowcore slab web bottoms highly equaled upper end cuts height, described two pieces of hollowcore slab web bottoms along bridge to the length value that cuts be cut height and cut length and form the distance of 1:3 gradient gradual transition to base plate; The width that cuts of described two pieces of hollowcore slab web both side ends is T=B/4, B is hollowcore slab width of main beam, and the length value that cuts of described two pieces of hollowcore slab web both side ends is cut width and cut length to form the distance of 1:4 gradient gradual transition to hollowcore slab web both sides.
10. the construction method of a kind of existing freely-supported Hollow Slab Beam Bridge serialization transformation according to claim 8, is characterized in that: in step (3), between described two blocks of hollowcore slab webs along bridge to build length be n=2H, H is hollowcore slab girder height; Described concrete is slightly expanded concrete.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107818228B (en) * | 2017-11-20 | 2020-04-10 | 福州大学 | Method for calculating transverse tension prestress of assembled hollow slab bridge |
| CN110804949A (en) * | 2019-11-04 | 2020-02-18 | 南京毛勒工程材料有限公司 | Pouring method for filler in anchoring area of expansion joint |
| CN112323655B (en) * | 2020-11-24 | 2022-09-30 | 南京迈越材料科技有限公司 | Reinforcing method for changing simple support of existing hollow plate beam into continuous support |
| CN113774809A (en) * | 2021-09-30 | 2021-12-10 | 广东深已建设工程有限公司 | Construction method for continuous structure of simply supported beam bridge deck |
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