CN101424075B - Concrete box girder bridge widening and reinforced structure and construction method thereof - Google Patents
Concrete box girder bridge widening and reinforced structure and construction method thereof Download PDFInfo
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- CN101424075B CN101424075B CN2008102331075A CN200810233107A CN101424075B CN 101424075 B CN101424075 B CN 101424075B CN 2008102331075 A CN2008102331075 A CN 2008102331075A CN 200810233107 A CN200810233107 A CN 200810233107A CN 101424075 B CN101424075 B CN 101424075B
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Abstract
The invention discloses a widening and reinforcing structure for a concrete box girder bridge and a method for constructing the same. The widening and reinforcing structure comprises a new box girder I and a new box girder II which are parallel with the original box girder bridge and are positioned at two sides of the original box girder bridge; and the box girder of the new box girder I and the box girder of the new box girder II are in rigid connection with box girder flanges of the original box girder bridge. The new box girders share part of the load of the original box girder so that theinternal force and the deformation (or the stress of a control point) of a controlled cross section of the original box girder bridge are reduced by about 20 percent; and the generation and the development of cracks on a crest slab, a bottom plate and a web plate of the original box girder bridge can be effectively inhibited. The widening and reinforcing structure is simple, has slight damage to the original box girder bridge, and does not increase obvious structure deadweight substantially. The method for widening and reinforcing constructions is simple and convenient; the reinforced concrete box girder bridge has a reliable structure; the construction period is relatively short; the impact on the road traffic is relatively small; and the damage to the natural environment and the bad social impact caused by the demolition of an old bridge are avoided, thus the method has good comprehensive technical, economic and social benefits.
Description
Technical field
The invention belongs to building structure and highway construction field, particularly a kind of concrete box girder bridge widening and reinforced structure and job practices thereof.
Background technology
Concrete box-beam bridge is one of more common bridge type, bridge type simple structure, the easy construction of this structure and be easy to safeguard.Because the early stage traffic volume and vehicle load are lower, the economic in addition limited a variety of causes that waits, the design width of box girder bridge is little usually, along with expanding economy, the increase of the traffic volume and vehicle load, the traffic capacity of original box girder bridge and supporting capacity are obviously not enough, have hindered expanding economy, and crack of different nature can appear in the case beam, influenced the bearing safety and the useful life longevity of bridge construction.If former box girder bridge is removed newly-built bridge, then can need a large amount of construction costs, cause the waste of manpower and materials, because the newly-built cycle is longer, influence the traffic of former road, hinder economic development; Because the dismounting of former bridge can produce a large amount of waste residues, remove the stacking waste residue and need occupy a large amount of areas, unfavorable in environmental protection.
For overcoming the above problems, method is reinforced and widened to appearance to old bridge case beam, effectively reinforcement means mainly is to strengthen case beam section area, affixing steel plate, stickup fibrage, be provided with and add vertical steel plate in prestressing with bond bundle, the case or increase the steelframe etc. of laterally putting more energy into, part or holistic resistant behavior to bridge construction has improvement to a certain extent, but also there are some limitation or deficiency, as strengthen case beam cross-sectional area and exist the original structure damage greatly, difficulty of construction is big, increase deadweight, new and old structure expands or shrink shortcoming such as inconsistent influence combination; The raising of the whole drag of affixing steel plate existence can't formation box-beam structure and high density bar planting are to the shortcoming of original structure damage; The prestressing with bond bundle is set to be existed the complexity of constructing, may cause new secondary disease, original structure is had damage and increases local shortcoming of conducting oneself with dignity the Thin-walled Box Girder structure; Increase vertical steel web in the case and have shortcomings such as steel using amount is big, construction is extremely difficult, bad adaptability; Increasing the steelframe of laterally putting more energy into does not have obvious improvement to the longitudinal stress situation of case beam, can't suppress the generation and the development of web diagonal crack.
Therefore, need a kind of concrete box girder bridge widening and reinforced structure and job practices thereof, when widening former box girder bridge, can reinforce former box girder bridge, can effectively suppress the generation and the development of top board, base plate and the web crackle of former box girder bridge case beam, structure and construction thereof are simple relatively, and former box girder bridge damage is reduced as far as possible.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of concrete box girder bridge widening and reinforced structure and job practices thereof, in the case beam of former box girder bridge, vertical steel truss is set, set up new case beam in former box girder bridge both sides, and new second hand cases beam is connect for whole by newly-increased crossbeam, make new case beam share fractional load for the second hand cases beam, make former box girder bridge even condition that improve constant be issued to tangible off-load purpose in design load, promptly former box girder bridge is not being carried out conventional the reinforcing under the condition of disposing substantially, the stress and the distortion in its control cross section are met design requirement; The present invention is simple in structure, stressed clear and definite, and little to former box girder bridge damage, it is simple and convenient to construct, less relatively to the road traffic influence, has good comprehensive technology, economic and social benefit.
Concrete box girder bridge widening and reinforced structure of the present invention comprises and is positioned at the new case beam I and the new case beam II of former box girder bridge both sides that the case beam of described new case beam I and the case beam of new case beam II and the box beam flange of former box girder bridge are rigidly connected parallel with former box girder bridge.
Further, also comprise and be positioned at the horizontal steel truss structure that vertical steel truss structure that former box girder bridge case beam inside vertically fixedly installs and crosswise fixed are provided with, described vertical steel truss structure is fixedlyed connected with horizontal steel truss structure, and at least two of described horizontal steel truss structures longitudinally and column distribution;
Further, vertically steel truss structure comprises upper chord, lower chord and web member, implant anchorage screw on described former box girder bridge case back plate and the base plate, upper chord and lower chord are fixedly installed on former box girder bridge case back plate and the base plate by anchorage screw respectively, fixedly connected with lower chord with upper chord respectively in described web member two ends; Between described upper chord and lower chord and former box girder bridge case back plate and the base plate adhesive linkage is set;
Further, the mode by the fluid concrete crossbeam is rigidly connected between the case web of the case web of described new case beam I and new case beam II and former box girder bridge; The quantity of described concrete beam and the quantity of position and horizontal steel truss structure is set and the position is set corresponding;
Further, the case beam bottom that is positioned at laterally relative concrete beam in former box girder bridge both sides and former box girder bridge is along laterally being provided with the reinforcement steel plate jointly, and described reinforcement steel plate is connected by the PBL shear connector with the cage of reinforcement of concrete beam; The case beam bottom of strengthening steel plate and former box girder bridge is bonding;
Further, to be rigidly connected in the mode of cast-in-situ concrete be one to the box beam flange of the box beam flange of the box beam flange of described new case beam I and new case beam II and former box girder bridge;
Further, when the top board of described former box girder bridge is removed because of having applied transverse prestress inconvenience, the end face of described new case beam I and new case beam II places bottom, the former overhanging edge of a wing of box girder bridge case beam, and with cast-in-situ concrete or infusion and binding material mode the overhanging edge of a wing of case beam of described new case beam I and new case beam II and former box girder bridge being connect is integral body;
Further, the web member sectional dimension of described vertical steel truss structure is or/and arrange that the two ends of density in one strides are greater than the middle part.
The invention also discloses a kind of box girder bridge and widen the job practices of reinforcing, may further comprise the steps:
A. removing former box girder bridge mats formation and supporting facility;
B. longitudinally implant anchorage screw at the top board of former box girder bridge and the desired location of base plate,, form vertical steel truss structure at the desired location welding web member of upper chord and lower chord by anchorage screw fixedly upper chord and lower chord; After forming vertical steel truss structure, between the case back plate of upper chord and lower chord and former box girder bridge and base plate, form adhesive linkage, make the case back plate and the base plate of upper chord and lower chord and former box girder bridge connect into integral body by pouring into binding material; Longitudinally be set up in parallel the transverse truss structure, the transverse truss structure is fixedlyed connected with the longitudiual truss structure and is anchored at the case beam inwall of former box girder bridge;
C. finish the construction of the new case beam I and the new case beam II of former box girder bridge both sides, fluid concrete crossbeam between the web of new case beam I and new case beam II and former box girder bridge case web, guarantee the quantity of concrete beam and the quantity of position and transverse truss structure is set and the position is set corresponding, along the common reinforcement steel plate of horizontally set, described reinforcement steel plate is connected by the PBL shear connector with the cage of reinforcement of concrete beam in the case beam bottom that is positioned at laterally relative concrete beam in former box girder bridge both sides and former box girder bridge; The case beam bottom of strengthening steel plate and former box girder bridge is bonding, and concrete beam and former box girder bridge case beam are coupled as one;
D. construction is finished after three months the case beam of new case beam I and the case beam of new case beam II and the box beam flange of former box girder bridge is rigidly connected;
E. finish new case beam I, new case beam II and former box girder bridge deck paving and supporting facility construction.
Further, among the step c, before new case beam I and new case beam II construction, the part edge of a wing of removing former box girder bridge case beam; And in the steps d, construction is finished after three months the edge of a wing of new case beam I and the edge of a wing of new case beam II and the box beam flange of former box girder bridge is rigidly connected in the mode that is cast for one; Perhaps, if when the case back plate of former box girder bridge 1 is removed because of having applied transverse prestress inconvenience, then among the step c, the end face of new case beam I and new case beam II places bottom, the former box girder bridge 1 overhanging edge of a wing; And in the steps d, construction is finished after three months the box beam flange of new case beam I top board and new case beam II top board and the former box girder bridge mode with cast-in-situ concrete is rigidly connected.
The invention has the beneficial effects as follows: concrete box girder bridge widening and reinforced structure of the present invention, new case beam with enough hard intensities and rigidity is set in former box girder bridge both sides, and be connected to integral body by newly-increased crossbeam and second hand cases beam, make new case beam share fractional load for the second hand cases beam; In former case beam inside the stress that vertical steel truss structure can effectively improve the case beam is set, significantly reduces the horizontal proof stress of case back plate, strengthen the shear resistance of former case beam, improve the distorting stress of former case beam; By above structural disposal, can make the internal force and the distortion (or the stress at control point) in former box girder bridge control cross section reduce 15～30% on year-on-year basis, substantially former box girder bridge is not being carried out conventional the reinforcing under the condition of disposing, the stress and the distortion in its control cross section are met design requirement; The present invention is simple in structure, stressed clear and definite, and is little to former box girder bridge damage; Reinforcing of the present invention and to widen job practices simple and convenient, structural performance after the reinforcing is reliable, and the duration is shorter relatively, and is less relatively to the road traffic influence, avoided taking down the old bridge to the infringement of natural environment and bad social influence, had good comprehensive technology, economic and social benefit.
Description of drawings
Below in conjunction with drawings and Examples the present invention is further described.
Fig. 1 is a structural representation of the present invention;
Fig. 2 is new case beam and former box girder bridge case beam upward view;
Fig. 3 is vertical steel truss structure schematic diagram;
Fig. 4 is that vertical steel truss structure and horizontal steel truss structure are arranged schematic diagram;
Fig. 5 is Figure 1A place enlarged drawing.
The specific embodiment
In the present embodiment, former box girder bridge is a speedway usefulness, is divided into parallel two.
Fig. 1 is a structural representation of the present invention, Fig. 2 is new case beam and former box girder bridge case beam upward view, Fig. 3 is vertical steel truss structure schematic diagram, Fig. 4 is that vertical steel truss structure and horizontal steel truss structure are arranged schematic diagram, Fig. 5 is Figure 1A place enlarged drawing, the concrete box girder bridge widening and reinforced structure of present embodiment comprises and is positioned at the new case beam I2 and the new case beam II3 of former box girder bridge 1 both sides that the edge of a wing of new case beam I2 and the edge of a wing of new case beam II3 and the box beam flange of former box girder bridge 1 are rigidly connected in the mode that is cast for one parallel with former box girder bridge 1; New case beam I2 is two two case box girder bridges, lays respectively at two former box girder bridges, 1 outside, and new case beam II3 is two and is positioned between the two former box girder bridges 1, and is just inboard; Two shared bridge piers of new case beam II3 and bearing, duration and cost are saved in easy construction; The bearing both sides of two new case beam II3 are cast for one with the bearing of two former box girder bridges 1 respectively, increase the rigidity and the intensity of structure;
1 case beam inside of former box girder bridge vertically fixedly installs the horizontal steel truss structure 5 of vertical steel truss structure 4 and crosswise fixed setting, vertically steel truss structure 4 and laterally steel truss structure 5 be fixedly connected by welding, a plurality of horizontal steel truss structures 5 are longitudinally and column distribution; Vertically steel truss structure 4 comprises upper chord 45, lower chord and web member 41, vertically the web member sectional dimension of steel truss structure 4 and the two ends of layout density in one strides are greater than the middle part, adapt to whole former box girder bridge 1 web stress situation, be beneficial to the generation and the development that suppress the web crackle; Implant anchorage screw 42 on 1 case back plate of former box girder bridge and the base plate, upper chord 45 and lower chord are fixedly installed on former case beam 1 top board and the base plate by anchorage screw 42 respectively, and upper chord 45 is connected on the anchorage screw 42 by nut 43; Lower chord is identical with the connected mode of the case back plate of former box girder bridge 1 with upper chord 45 with the connected mode of the case beam base plate of former box girder bridge 1; Fixedly connected with lower chord with upper chord 45 respectively in web member 41 two ends, the connected mode of present embodiment is welding, certainly, also can adopt forms such as bolt connection; Adopt upper chord 45 and lower chord structure, make vertical steel truss structure 4 have stronger compliance, connect relatively firm stable for the top board inner surface of former box girder bridge 1; Between 1 case back plate of upper chord 45 and lower chord and former box girder bridge and the base plate adhesive linkage 44 is set, adhesive linkage 44 can make vertical steel truss structure 4 be connected to integral body by the case beam of upper chord 45 and lower chord and former box girder bridge 1, increases bonding strength;
Mode by fluid concrete crossbeam 6 between the web of new case beam I2 and new case beam II3 and 1 case web of former box girder bridge is rigidly connected, and constitutes to connect the crossbeam of widening bridge; The quantity of described the concrete beam 6 and quantity of position and horizontal steel truss structure 5 is set and the position is set corresponding; Steel plate 7 is strengthened along laterally being provided with jointly in the case beam bottom that is positioned at laterally relative concrete beam 6 in former box girder bridge 1 both sides and former box girder bridge 1, strengthens steel plate 7 and is connected by the PBL shear connector with the cage of reinforcement of concrete beam 6; It is bonding with the case beam bottom of former box girder bridge 1 to strengthen steel plate 7; The mode that stretches into mutually by reinforcing bar between concrete beam 6 and the web is poured into a mould, and adopts and to arrange respectively that up and down a lacing wire stretches into mutually, the skeleton muscle is set between the lacing wire pours into a mould, and makes former box girder bridge 1 reduce impaired as far as possible; Adopt concrete beam 6 and strengthen steel plate 7 structures, the fractional load of former case joist support load 1 is distributed to new case beam I2 bear, guarantee the durability of old bridge with new case beam II3.
When if the case back plate of former box girder bridge 1 is removed because of having applied transverse prestress inconvenience, the end face of described new case beam I2 and new case beam II3 places bottom, the former box girder bridge 1 overhanging edge of a wing, with cast-in-situ concrete or infusion and binding material mode the overhanging edge of a wing of case beam of described new case beam I2 and new case beam II3 and former box girder bridge being connect is integral body, plays the effect of taking on former box girder bridge 1 jointly.
Box girder bridge of the present invention is widened the job practices of reinforcing, may further comprise the steps:
A. removing former box girder bridge mats formation and supporting facility;
B. longitudinally implant anchorage screw 42 at the top board of former box girder bridge 1 and the desired location of base plate,, form vertical steel truss structure 4 at the desired location welding web member 41 of upper chord 45 and lower chord by anchorage screw 42 fixedly upper chord 45 and lower chord; After forming vertical steel truss structure 4, between the case back plate of upper chord 45 and lower chord and former box girder bridge 1 and base plate, form adhesive linkage 44, make the case back plate and the base plate of upper chord 45 and lower chord and former box girder bridge 1 connect into integral body by pouring into binding material; Longitudinally be set up in parallel transverse truss structure 5, transverse truss structure 5 is fixedlyed connected with longitudiual truss structure 4 and is anchored at the case beam inwall of former box girder bridge 1;
C. remove the part edge of a wing of 1 case beam of former box girder bridge, finish the construction of the new case beam I2 and the new case beam II3 of former box girder bridge 1 both sides, fluid concrete crossbeam 6 between the web of new case beam I2 and new case beam II3 and 1 case web of former box girder bridge, guarantee the quantity of concrete beam 6 and the quantity of position and transverse truss structure 5 is set and the position is set corresponding, along the common reinforcement steel plate 7 of horizontally set, described reinforcement steel plate 7 is connected by the PBL shear connector with the cage of reinforcement of concrete beam 6 in the case beam bottom that is positioned at laterally relative concrete beam 6 in former box girder bridge 1 both sides and former box girder bridge 1; It is bonding with the case beam bottom of former box girder bridge 1 to strengthen steel plate 7, and concrete beam 6 and 1 case beam of former box girder bridge are coupled as one;
D. construction is finished after three months the edge of a wing of new case beam I2 and the edge of a wing of new case beam II3 and the box beam flange of former box girder bridge 1 is rigidly connected in the mode that is cast for one;
E. finish new case beam I, new case beam II and former box girder bridge deck paving and supporting facility construction.
When if the case back plate of former box girder bridge 1 is removed because of having applied transverse prestress inconvenience, then do not remove the part edge of a wing of 1 case beam of former box girder bridge among the step c, the end face of new case beam I2 and new case beam II3 places bottom, the former box girder bridge 1 overhanging edge of a wing, and in the steps d, construction is finished after three months the box beam flange of new case beam I2 top board and new case beam II3 top board and former box girder bridge 1 mode with cast-in-situ concrete is rigidly connected; With cast-in-situ concrete or infusion and binding material mode the overhanging edge of a wing of case beam of described new case beam I2 and new case beam II3 and former box girder bridge is connect and be integral body, need do not remove the part edge of a wing of former box girder bridge 1, construction is simple, and cost is low.
Certainly, above embodiment can not constitute limiting the scope of the invention, and the narration of work progress can not limit the sequencing of construction, in the practice of construction, according to the needs of reality, regulates sequence of construction.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (9)
1. concrete box girder bridge widening and reinforced structure, it is characterized in that: comprise parallel and be positioned at the new case beam I (2) and the new case beam II (3) of former box girder bridge (1) both sides with former box girder bridge (1), described new case beam I (2) and new case beam II (3) are rigidly connected with the box beam flange of former box girder bridge (1), also comprise and be positioned at the horizontal steel truss structure (5) that vertical steel truss structure (4) that former box girder bridge (1) case beam inside vertically fixedly installs and crosswise fixed are provided with, described vertical steel truss structure (4) is fixedlyed connected with horizontal steel truss structure (5), (5) at least two of described horizontal steel truss structures longitudinally and column distribution, described new case beam I (2) and newly between the case web of case beam II (3) and former box girder bridge (1) the case web mode by fluid concrete crossbeam (6) be rigidly connected; The quantity of described concrete beam (6) and the quantity of position and horizontal steel truss structure (5) is set and the position is set corresponding.
2. concrete box girder bridge widening and reinforced structure according to claim 1, it is characterized in that: vertically steel truss structure (4) comprises upper chord (45), lower chord and web member (41), implant anchorage screw (42) on described former box girder bridge (1) case back plate and the base plate, upper chord (45) and lower chord are fixedly installed on former box girder bridge (1) case back plate and the base plate by anchorage screw (42) respectively, fixedly connected with lower chord with upper chord (45) respectively in described web member (41) two ends; Between described upper chord (45) and lower chord and former box girder bridge (1) case back plate and the base plate adhesive linkage (44) is set.
3. concrete box girder bridge widening and reinforced structure according to claim 2, it is characterized in that: steel plate (7) is strengthened along laterally being provided with jointly in the case beam bottom that is positioned at laterally relative concrete beam (6) in former box girder bridge (1) both sides and former box girder bridge (1), and described reinforcement steel plate (7) is connected by the PBL shear connector with the cage of reinforcement of concrete beam (6); It is bonding with the case beam bottom of former box girder bridge (1) to strengthen steel plate (7).
4. concrete box girder bridge widening and reinforced structure according to claim 3 is characterized in that: it is one that the box beam flange of the box beam flange of described new case beam I (2) and new case beam II (3) and the box beam flange of former box girder bridge (1) are rigidly connected in the mode of cast-in-situ concrete.
5. concrete box girder bridge widening and reinforced structure according to claim 3, it is characterized in that: when the case back plate of described former box girder bridge (1) is removed because of having applied transverse prestress inconvenience, the end face of described new case beam I (2) and new case beam II (3) places bottom, the overhanging edge of a wing of former box girder bridge (1), and with cast-in-situ concrete or infusion and binding material mode described new case beam I (2) and new case beam II (3) being connect with the overhanging edge of a wing of the case beam of former box girder bridge is integral body.
6. concrete box girder bridge widening and reinforced structure according to claim 4 is characterized in that: the web member sectional dimension of described vertical steel truss structure (4) is or/and arrange that the two ends of density in one strides are greater than the middle part.
7. the concrete box girder bridge widening job practices of reinforcing is characterized in that: may further comprise the steps:
A. removing former box girder bridge (1) mats formation and supporting facility;
B. longitudinally implant anchorage screw (42) at the top board of former box girder bridge (1) and the desired location of base plate, by anchorage screw (42) fixedly upper chord (45) and lower chord, form vertical steel truss structure (4) at the desired location welding web member (41) of upper chord (45) and lower chord; After forming vertical steel truss structure (4), between the case back plate of upper chord (45) and former box girder bridge (1), form adhesive linkage (44) by pouring into binding material, make the upper chord (45) and the case back plate of former box girder bridge (1) connect into integral body, between the base plate of lower chord and former box girder bridge (1), form adhesive linkage, make the base plate of lower chord and former box girder bridge (1) connect into integral body by pouring into binding material; Longitudinally be set up in parallel transverse truss structure (5), transverse truss structure (5) is fixedlyed connected with longitudiual truss structure (4) and is anchored at the case beam inwall of former box girder bridge (1);
C. finish the construction of the new case beam I (2) and the new case beam II (3) of former box girder bridge (1) both sides, at new case beam I (2) and new fluid concrete crossbeam (6) between the web of case beam II (3) and former box girder bridge (1) the case web, guarantee the quantity of concrete beam (6) and the quantity of position and transverse truss structure (5) is set and the position is set corresponding, along the common reinforcement steel plate (7) of horizontally set, described reinforcement steel plate (7) is connected by the PBL shear connector with the cage of reinforcement of concrete beam (6) in the case beam bottom that is positioned at laterally relative concrete beam (6) in former box girder bridge (1) both sides and former box girder bridge (1); It is bonding with the case beam bottom of former box girder bridge (1) to strengthen steel plate (7), and concrete beam (6) and former box girder bridge (1) case beam are coupled as one;
D. the box beam flange finished after three months new case beam I (2) and new case beam II (3) and former box girder bridge (1) of construction is rigidly connected;
E. finish new case beam I, new case beam II and former box girder bridge deck paving and supporting facility construction.
8. box girder bridge according to claim 7 is widened the job practices of reinforcing, it is characterized in that: among the step c, and before new case beam I (2) and new case beam II (3) construction, the part edge of a wing of removing former box girder bridge (1) case beam; And in the steps d, construction is finished after three months the edge of a wing of new case beam I (2) and the edge of a wing of new case beam II (3) and the box beam flange of former box girder bridge (1) is rigidly connected in the mode that is cast for one.
9. box girder bridge according to claim 7 is widened the job practices of reinforcing, it is characterized in that: the case beam of former box girder bridge applied transverse prestress, and among the step c, the end face of new case beam I (2) and new case beam II (3) places bottom, the overhanging edge of a wing of former box girder bridge (1); And in the steps d, construction is finished after three months the box beam flange of new case beam I (2) top board and new case beam II (3) top board and former box girder bridge (1) mode with cast-in-situ concrete is rigidly connected.
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| CN2008102331075A CN101424075B (en) | 2008-11-24 | 2008-11-24 | Concrete box girder bridge widening and reinforced structure and construction method thereof |
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| CN2008102331075A CN101424075B (en) | 2008-11-24 | 2008-11-24 | Concrete box girder bridge widening and reinforced structure and construction method thereof |
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2008
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