CN108755459A - A kind of compound anti-bend reinforced construction of old Hollow Slab Beam Bridge steel wire rope MPC and construction method - Google Patents
A kind of compound anti-bend reinforced construction of old Hollow Slab Beam Bridge steel wire rope MPC and construction method Download PDFInfo
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- CN108755459A CN108755459A CN201810913705.0A CN201810913705A CN108755459A CN 108755459 A CN108755459 A CN 108755459A CN 201810913705 A CN201810913705 A CN 201810913705A CN 108755459 A CN108755459 A CN 108755459A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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Abstract
The invention discloses a kind of compound anti-bend reinforced constructions of old Hollow Slab Beam Bridge steel wire rope MPC and construction methods, including improve impaired concrete, and the development of control critical eigenvalue.Then MPC composite materials are poured reinforcing by arrangement steel strand wires and stretch-draw anchor in the bottom of the hollow slab girder again, and the steel strand wires of tensioning and anchorage are in the inside of MPC composite materials.MPC composite materials are combined the reinforcing for carrying out hollow slab girder by the present invention with steel strand wires, and the construction period is short, uninterrupted traffic；MPC composite materials have a stronger frost resistance, crack developing more slowly, and prevent the corrosion of steel strand wires, mitigate the pressure of anchorage.The final anti-bending bearing capacity for enhancing hollow slab girder.
Description
Technical field
The present invention relates to one kind being used for civil engineering Technology Bridge Strengthening field, is more particularly to a kind of old Hollow Slab Beam Bridge
The compound anti-bend reinforced constructions of steel wire rope MPC and construction method.
Background technology
With the continuous development of China's economy, the freight of the volume of traffic and large size sharply increases, in long-term natural ring
Under border and use environment, quite a few bridge aging aggravation is drastically declined using function, is had been unable to meet normal passage and is wanted
It asks.Its is main to show as：Corrosion occurs for concrete material deterioration, reinforcing bar, the bottom of beam is cracked, hinge seam destroys etc., these are existing
As causing the bending bearing capacity of bridge to decline, the needs of transport development are had been unable to meet.
The bridge in China has arrived the large-scale maintenance stage in recent years, and the reinforcement technique of different types of rridges emerges one after another.
Such as：Increasing section method for strengthening, strengthening with external bonding method, external prestressed strengthening method.But these methods have certain limitation.
Such as：Increasing section method for strengthening increases dead weight, affects that under-clearance, the time of construction is long, bar planting is easy to original knot
Structure generates secondary destruction；Affixing carbon fabric, steel plate equal thickness compared with thin material, under larger load action base material bond effect compared with
It is difficult to guarantee, although MPC materials have many advantages, such as that lightweight, high-strength, high-ductility, caking property are good, single use is such material reinforced, holds
Loading capability improves limitation；External prestressed strengthening method make prestressed cable be easy by the external world destroyed, anchorage be easy corrosion,
Anchored end concrete stress is complicated.
So in this background, a kind of compound anti-bend reinforced constructions of old Hollow Slab Beam Bridge steel wire rope MPC of exploitation and construction
Method has a great deal of practical meanings.
Invention content
The purpose of the present invention is：In view of the above-mentioned problems, propose one kind can substantially enhance bridge bending bearing capacity and
It controls former bridge crack developing while smaller and relatively beautiful reinforcement means is influenced to traffic.
To achieve the goals above, the present invention uses following technical measures：
A kind of old compound anti-bend reinforced constructions of Hollow Slab Beam Bridge steel wire rope MPC, including steel strand wires, MPC composite materials, T-type
Steel, angle steel, bulb-end anchorage anchorage, jack, expansion bolt and template；
At least two T-steels are fixed in the bottom base plate of reinforced hollow slab girder, steel strand wires are equipped between two T-steels,
The both ends of steel strand wires are fixed on two T-steels after carrying out tensioning with jack pair steel strand wires；It is equipped with one in the lower section of steel strand wires
The both ends of a template, the template extend to outside the fixing end of steel strand wires, are fixed on the bottom plate for reinforcing hollow slab girder
On, and MPC composite materials have been poured in the space that the template and the bottom plate are formed, MPC composite materials wrap steel
Twisted wire.
Further, the T-steel is symmetrical relative to the center line of the bottom plate.
Further, the length of the steel strand wires is long equal to the half of the bottom plate, and relative to the bottom plate
Center line it is symmetrical.
Further, the steel strand wires both ends are anchored at by anchorage on T-steel.
Further, the template is symmetrical also relative to the center line of the bottom plate.
Further, the template is fixed on the lower section of the bottom plate by angle steel.
Further, the angle steel is located at hollow slab girder baseplate underside, solid by expansion bolt in the both sides of steel strand wires
It is scheduled under the bottom plate of hollow slab girder, plays the role of fixed form；The template by bolt together with Bolted angle connection, position
In the lower section of hollow slab girder bottom plate.
Further, the T-steel is cold worked in advance, first the bottom plate of anchor T-steel, and number is anchored in web
Root high strength wire rope, then jack tension steel wire rope is extremely more than the yield strength of T-steel, loosens pulling force, T-steel produces at this time
Plastic deformation is given birth to；It is reinforced again after T-steel is stored 15-20 days under room temperature.
Further, MPC composite materials are matched by special cement, liquid charging stock A and liquid charging stock B, by liquid
Raw material A for a period of time, it is compound to add generation MPC after a period of time is mixed in liquid charging stock B with special cement mixing and stirring
Material can then be poured；The liquid charging stock A is polyether polyol or polyester polyol, and liquid charging stock B is isocyanic acid
Ester；Liquid charging stock A in MPC composite materials：Liquid charging stock B：The ratio of special cement is 1:1:2.
Further, the various chemical compositions of special cement are by quality accounting：Silica accounts for 55%-69%, oxidation
Aluminium accounts for 20%-38%, and iron oxide accounts for 1.5%-5.3%, and calcium oxide accounts for 2.0%-6.4%, and magnesia accounts for 0.2%-2.8%；
The various chemical compositions of liquid charging stock A and liquid charging stock B modified polyurethanes are by quality accounting：Polyethers accounts for 47%-
49%, fire retardant accounts for 0.1%-0.5%, and silicone oil accounts for 0.5%-1.5%, and catalyst accounts for 0.1%-0.5%, and water accounts for 0%-1%, gathers
Isocyanates 40%-60%.
Further, special cement is to add a certain amount of Portland cement combination using flyash as primary raw material
Made of cement.
Further, the reinforcing area is the half length of full wafer beam, using the center of beam as symmetry axis；This beam section
Bottom plate by pulling force, and beam section is based on being sheared at a quarter of beam-ends, therefore the anti-bending bearing capacity master of lifting beam
Want can then to be promoted the efficiency of reinforcing at the center half of reinforcement.
Further, the stretch-draw prestressing force is steel strand wires all on one section of simultaneous tension, avoids tensioning respectively
Loss of prestress caused by steel strand wires.
To the construction method of the enhancing hollow slab girder bending bearing capacity, there are following steps：
Step 1: hollow slab girder bottom plate basal plane is handled, removed with the concrete that hollow slab girder bottom plate is carbonized by wire brush, so
The dust on surface is disposed again afterwards, rinses surface；
Step 2: being fixed at a quarter of hollow slab girder by expansion bolt on the T-steel flange plate for open via；
Step 3: steel strand wires to be passed through to the honeycomb hole of anchor cup, then by steel strand wires end jumping-up, direct pressure-bearing is by steel strand wires
It is anchored in anchor cup, then screws on anchor circle in fixing end；Stretching end screws in the pull rod being connect with jack in anchor cup, thousand
When reaching the stretching force of design, anchor circle is tightened, is slowly loosening jack, is exiting in carrying out tensioning on T-steel for jin top support
Pull rod；
Step 4: in the outside of T-steel, the both sides of steel strand wires, fixed angle steel；
Step 5: concrete surface is made to moisten；
Step 6: installation form；Template is mounted on to the lower section of cored slab, and reserved mud jacking duct, while in template
Inside brushing releasing agent；
Step 7: preparing MPC composite materials；For a period of time by liquid charging stock A and special cement mixing and stirring, then add again
Enter liquid charging stock B and a period of time is mixed, keeps MPC composite materials uniform；
Step 8: pouring MPC composite materials；The MPC composite materials prepared are passed through into hole path pressure grouting, maintenance a period of time
The construction of reinforcing layer is completed in form removal afterwards.
The present invention has the following advantages compared with the existing technology：
(1) MPC materials all have higher-strength with steel strand wires, and MPC composite materials and steel strand wires are combined progress
The reinforcing of hollow slab girder, steel strand wires can greatly promote the bending bearing capacity of hollow slab girder after applying prestressing force；Meanwhile MPC
Composite material makes steel wire rope not allow easy-to-rust, and also functions to inhibiting effect to the development in the crack of beam bottom.
(2) cohesive force of MPC composite materials will not slide more by force with cement concrete, while can also mitigate anchorage
Pressure.
(3) template is fixed on beam bottom by angle steel and expansion bolt, carries out shuttering supporting without setting up scaffold, construction is more
Add conveniently, and reduces the influence to traffic under bridge to the greatest extent.
(4) T-steel, which carries out stretching in advance, makes the ability of its resistance to deformation greatly promote, the deformation very little of itself；It opens simultaneously
Drawing steel stranded wire.Both measures reduce prestressed loss.
(5) the configuration of the present invention is simple can reinforce bridge currently in use, can also be carried out to monolithic hollow slab girder
It reinforces, improves construction efficiency, save the construction time, Social benefit and economic benefit is very notable.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is that cored slab reinforces general illustration；
Fig. 2 is the partial schematic diagram of cored slab reinforcing layer；
Fig. 3 is pier nose anchor anchorage schematic diagram；
Fig. 4 is that cored slab reinforces cross-sectional view；
Fig. 5 is bridge bottom plate steel strand wires schematic diagram；
Fig. 6 is that template erects schematic diagram.
In figure：The old hollow slab girder 2-MPC composite materials 3- steel strand wires 4-T shaped steel 5- expansion bolts 6- steel wire upsettings of 1-
Head 7- anchor cup 8- anchor circle 9- backing plate 10- steel strand wires, 11-T word steel 12- template 13- angle steel.
Specific implementation mode
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
As background technology is introduced, the technology for reinforcing hollow slab girder at present has the following problems：(1) increasing section adds
Gu method increases dead weight, affects that under-clearance, the time of construction is long, bar planting is easy to generate secondary destruction to original structure；
(2) affixing carbon fabric, steel plate equal thickness are compared with thin material, and base material bond effect is relatively difficult to guarantee under larger load action, MPC materials
Although material has many advantages, such as that lightweight, high-strength, high-ductility, caking property are good, single use is such material reinforced, and bearing capacity improves journey
It spends limited；(3) external prestressed strengthening method makes prestressed cable be easy to be destroyed by the external world, anchorage is easy corrosion, anchored end is mixed
Solidifying soil stress complexity is in order to solve technical problem as above, and present applicant proposes a kind of old Hollow Slab Beam Bridge steel wire rope MPC is compound
Anti-bend reinforced construction and construction method.
Below in conjunction with attached drawing 1,2,3,4,5,6, the structure of the present invention is further described.
The present invention provides a kind of compound anti-bend reinforced constructions of old Hollow Slab Beam Bridge steel wire rope MPC and construction methods, meet
Construction period, consolidation effect enhancing hollow slab girder bending bearing capacity device and construction method.
In conjunction with Fig. 1 to Fig. 6, the device of enhancing hollow slab girder bending bearing capacity specifically includes-MPC composite materials 2, steel twists
Line 3, T-steel 4, pier nose anchor anchorage (Fig. 3), template.
In conjunction with diagram 1 and diagram 2, T-steel is located at (described here four at a quarter of reinforced hollow slab girder bottom plate
Refer to respectively being retracted a quarter inward since the both ends for reinforcing hollow slab girder bottom plate at/mono-；The length of the steel strand wires
Half equal to the bottom plate is long, and the center line relative to the bottom plate is symmetrical.).
T steel 4, in four angle trepannings of flange plate, sky is fixed on by expansion bolt 5 using the models of tw50 × 100
On the bottom plate of core beam.
In conjunction with diagram 1 and diagram 2, steel strand wires 3 are located at below the beam bottom of hollow slab girder 1, and steel strand wires are using diameter 12.7
Prestress wire.The bulb-end anchorage anchorage is located at T-steel；The steel strand wires are under the bottom plate of hollow slab girder, with thousand
Jin jacking row tensioning, and be anchored at T-steel plate by anchorage；
Wherein：Pier nose anchor anchorage is made of anchor circle 8, backing plate 9, anchor cup 7, and specific position relationship is as shown in Figure 3；
Further, steel strand wires 3 use 12.7 prestress wire of diameter.
Further, angle steel 13 is using L45*6 specifications.
Further, template 12 uses the steel plate of 1.5 cm thicks.
In conjunction with diagram 1 and diagram 2, MPC composite materials 2 be by special cement, liquid charging stock A and liquid charging stock B proportionings and
At first for a period of time by liquid charging stock A and special cement mixing and stirring, then adding liquid charging stock B and be mixed one section
Time can then be poured.Each raw material of MPC composite materials in quality ratio (liquid charging stock A：Liquid charging stock B：Special cement)
It is 1:1:2.Polyether polyol or polyester polyol may be used in liquid charging stock A, and liquid charging stock B is isocyanates.
The various chemical compositions of special cement are by quality accounting：Silica accounts for 55%-69%, and aluminium oxide accounts for 20%-
38%, iron oxide accounts for 1.5%-5.3%, and calcium oxide accounts for 2.0%-6.4%, and magnesia accounts for 0.2%-2.8%；Modified polyurethane
Various chemical compositions are by quality accounting：Polyethers accounts for 47%-49%, and fire retardant accounts for 0.1%-0.5%, and silicone oil accounts for 0.5%-
1.5%, catalyst accounts for 0.1%-0.5%, and water accounts for 0%-1%, polyisocyanate 40%-60%.
Special cement is to add the water that a certain amount of Portland cement is composed using flyash as primary raw material
Mud.It can be preferably filled in the hole of polyurethane relative to ordinary cement, keep composite material uniformity more preferable, it will be apparent that carry
Rise the intensity of polyurethane.
In conjunction with diagram 1, diagram 2, diagram 3, bulb-end anchorage anchorage is located at T-steel, pier nose anchor anchorage by anchor circle 8, backing plate 9,
Anchor cup 7 forms, and tensioning is carried out by jack.
To the construction method of the enhancing hollow slab girder bending bearing capacity, including following steps：
Step 1：The processing of 1 bottom plate basal plane of hollow slab girder is removed with the concrete that hollow slab girder bottom plate is carbonized by wire brush,
Then the dust on surface is disposed again, surface is rinsed with tap water.
Step 2：The a quarter of hollow slab girder 1 is fixed on by expansion bolt 5 on 4 flange plate of T-steel for opening via
Place.
Step 3：Steel strand wires 3 are passed through to the honeycomb hole of anchor cup 7, then borrow heading straight steel wire end jumping-up with button head machine
Pressure-bearing is connect by steel strand anchoring in anchor cup 7, then screws on anchor circle 8 in fixing end.Stretching end, the drawing that will be connect with jack
Bar screws in anchor cup 7, and jack, which is supported on T-steel 4, carries out tensioning, and when reaching the stretching force of design, anchor circle 8 is tightened,
Slowly loosen jack, exits pull rod.
Step 4：In the outside of T-steel 4, the both sides of steel strand wires 3, angle steel 13 is fixed by expansion bolt 5.
Step 5：Tap water, which is rinsed the concrete surface cleared up, makes surface wettability.
Step 6：Installation form 12.Below Bolted angle connection to cored slab bottom plate, and reserved mud jacking duct.
Step 7：Prepare MPC composite materials 2.For a period of time by liquid charging stock A and special cement mixing and stirring, then again
Liquid charging stock B is added, a period of time is mixed, keeps MPC composite materials uniform.
Step 8：Pour MPC composite materials.By the MPC composite materials 2 prepared by hole path pressure grouting, conserve 24 hours
The construction of reinforcing layer is completed in form removal 12 afterwards.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of old compound anti-bend reinforced constructions of Hollow Slab Beam Bridge steel wire rope MPC, which is characterized in that compound including steel strand wires, MPC
Material, T-steel and template；
At least two T-steels are fixed in the bottom base plate of reinforced hollow slab girder, steel strand wires are equipped between two T-steels, with thousand
Jin top is fixed on two T-steels the both ends of steel strand wires after steel strand wires progress tensioning；Mould there are one being set below steel strand wires
The both ends of plate, the template extend to outside the fixing end of steel strand wires, are fixed on the bottom plate of the reinforcing hollow slab girder, and
MPC composite materials are poured in the space that the template and the bottom plate are formed, MPC composite materials wrap steel strand wires.
2. the old compound anti-bend reinforced constructions of Hollow Slab Beam Bridge steel wire rope MPC as described in claim 1, which is characterized in that described
T-steel it is symmetrical relative to the center line of the bottom plate.
3. the old compound anti-bend reinforced constructions of Hollow Slab Beam Bridge steel wire rope MPC as described in claim 1, which is characterized in that described
The a quarter that the length of steel strand wires is equal to the bottom plate is long, and the center line relative to the bottom plate is symmetrical.
4. the old compound anti-bend reinforced constructions of Hollow Slab Beam Bridge steel wire rope MPC as described in claim 1, which is characterized in that described
Steel strand wires both ends are anchored at by anchorage on T-steel.
5. the old compound anti-bend reinforced constructions of Hollow Slab Beam Bridge steel wire rope MPC as described in claim 1, which is characterized in that described
Template it is symmetrical also relative to the center line of the bottom plate.
6. the old compound anti-bend reinforced constructions of Hollow Slab Beam Bridge steel wire rope MPC as described in claim 1, which is characterized in that described
Template the lower section of the bottom plate is fixed on by angle steel.
7. the old compound anti-bend reinforced constructions of Hollow Slab Beam Bridge steel wire rope MPC as described in claim 1, which is characterized in that described
Angle steel be located at hollow slab girder baseplate underside and be fixed under the bottom plate of hollow slab girder by expansion bolt in the both sides of steel strand wires,
Play the role of fixed form；The template together with Bolted angle connection, is located at the lower section of hollow slab girder bottom plate by bolt.
8. a kind of construction method of the old compound anti-bend reinforced constructions of Hollow Slab Beam Bridge steel wire rope MPC, which is characterized in that there is following step
Suddenly：
Step 1: hollow slab girder bottom plate basal plane is handled；
Step 2: the T-steel flange plate for opening via is fixed at a quarter of hollow slab girder；
Step 3: steel strand wires to be passed through to the honeycomb hole of anchor cup, then steel strand wires end jumping-up is directly held by means of heading with button head machine
Anchor circle in anchor cup, is then screwed on steel strand anchoring by pressure in fixing end；Stretching end screws in the pull rod being connect with jack
In anchor cup, jack, which is supported on T-steel, carries out tensioning, and when reaching the stretching force of design, anchor circle is tightened, is slowly loosening thousand
Jin top, exits pull rod；
Step 4: in the outside of T-steel, the both sides of steel strand wires, fixed angle steel；
Step 5: concrete surface is made to moisten；
Step 6: installation form；Template is mounted on to the lower section of cored slab, and reserved mud jacking duct, while in the inside of template
Brushing releasing agent；
Step 7: preparing MPC composite materials；Liquid charging stock A is reacted to a period of time with special cement mixing and stirring, is then added again
Enter liquid charging stock B and a period of time is mixed, keeps MPC composite materials uniform.；
Step 8: pouring MPC composite materials；By the MPC composite materials prepared by hole path pressure grouting, maintenance is torn open after 24 hours
Mould completes the construction of reinforcing layer.
9. the construction method of the old compound anti-bend reinforced constructions of Hollow Slab Beam Bridge steel wire rope MPC as claimed in claim 8, feature
It is, when tension steel strand, the steel strand wires simultaneous tension on same section；The web of the T-steel carries out stretching in advance cold
Processing, and store 15-20 days in a natural environment.
10. the construction method of the old compound anti-bend reinforced constructions of Hollow Slab Beam Bridge steel wire rope MPC as claimed in claim 8, special
Sign is that the MPC composite materials are matched by special cement, liquid charging stock A and liquid charging stock B, liquid charging stock A with
Special cement mixing and stirring for a period of time, then adds liquid charging stock B and a period of time is mixed, then can be poured；Institute
The liquid charging stock A stated is polyether polyol or polyester polyol, and liquid charging stock B is isocyanates；Liquid is former in MPC composite materials
Expect A：Liquid charging stock B：The ratio of special cement is 1:1:2；
The various chemical compositions of the special cement are by quality accounting：Silica accounts for 55%-69%, and aluminium oxide accounts for
20%-38%, iron oxide account for 1.5%-5.3%, and calcium oxide accounts for 2.0%-6.4%, and magnesia accounts for 0.2%-2.8%；
The various chemical compositions of modified polyurethane are by quality accounting：Polyethers accounts for 47%-49%, and fire retardant accounts for 0.1%-0.5%,
Silicone oil accounts for 0.5%-1.5%, and catalyst accounts for 0.1%-0.5%, and water accounts for 0%-1%, polyisocyanate 40%-60%.
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| CN109537475A (en) * | 2018-11-26 | 2019-03-29 | 山东交通学院 | The method and ruggedized construction of bent cap reinforcing are carried out using carbon fiber |
| CN110616645A (en) * | 2019-10-17 | 2019-12-27 | 辽宁省交通规划设计院有限责任公司 | Reinforcing method and reinforcing structure of old concrete bridge |
| CN110616646A (en) * | 2019-10-17 | 2019-12-27 | 辽宁省交通规划设计院有限责任公司 | Method and structure for reinforcing concrete original bridge |
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