CN102191750A - Construction method for waterproof isolation structure of anchor plate of cable-stayed bridge by adopting steel-concrete composite beam - Google Patents
Construction method for waterproof isolation structure of anchor plate of cable-stayed bridge by adopting steel-concrete composite beam Download PDFInfo
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- CN102191750A CN102191750A CN 201010121521 CN201010121521A CN102191750A CN 102191750 A CN102191750 A CN 102191750A CN 201010121521 CN201010121521 CN 201010121521 CN 201010121521 A CN201010121521 A CN 201010121521A CN 102191750 A CN102191750 A CN 102191750A
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Abstract
The invention relates to a construction method for a waterproof isolation structure of an anchor plate of a cable-stayed bridge by adopting a steel-concrete composite beam. The construction method comprises the following steps of: firstly, prefabricating a concrete bridge deck slab in advance; secondly, casting concrete in a notch reserved between the prefabricated concrete bridge deck slab and the anchor plate in place after the prefabricated concrete bridge deck slab is installed between a steel main beam and the anchor plate in a manner of reserving the notch, and painting a waterproof agent on the concrete surface and the surface of the prefabricated concrete bridge deck slab after the maintenance; thirdly, laying flexible isolation material blocks on an extended cast-in-place concrete surface of the anchor plate, wherein the laid flexible isolation material blocks lean against and abut against oblique blocks of the anchor plate; fourthly, coating a waterproof film made of waterproof materials; and fifthly, laying an asphalt concrete bridge floor. The invention aims at solving the technical problems of incapability of overcoming the defect that rainwater leaks downwards along a gap between the anchor plate and a concrete slab of the bridge floor and time and labor waste for maintenance in the conventional rigid waterproof construction method.
Description
Technical field
The present invention relates to the job practices of steel-mixed bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure, especially lay the job practices of the waterproof isolation structure of flexible isolating material at steel-mixed bondbeam cable stayed bridge anchor arm-tie place.
Background technology
The anchor pulling plate structure is a steel-mix one of bondbeam cable stayed bridge rope, beam anchorage style, has that simple in structure, Path of Force Transfer is simple and directly understood, the stress of anchorage zone is clear and definite, easy construction, drag-line safeguard, change advantages such as convenient.The application extremely favor of engineers of the cable beam anchoring mode of anchor arm-tie in steel-mixed bondbeam cable stayed bridge, the anchor drawplate type cable beam anchoring structure is used widely.
Waterproof, the anti-corrosion at steel-mixed bondbeam cable stayed bridge anchor arm-tie place is to be the subject matter that design of anchor arm-tie and construction face always.For solving the anchor arm-tie anticorrosion problem that seeps water, the cable stayed bridge of building is in early days taked directly with concrete the anchor arm-tie to be stretched out the job practices that " rigid waterproofing " of bridge surface waterproof layer shut or adopted in the girder steel zone.Come seeping phenomenon to prevent in the short term, but because suspension cable is under wind and rain vibration or other load actions, the contact surface of the wet joint concrete of anchor arm-tie and bridge floor can produce the later stage cracking, rainwater in case from then on the slit infiltrate, can cause steel work corrosions such as anchor arm-tie, steel girder, effectively carry the steel plate reduced thickness; Simultaneously, the steel plate volume of corrosion increases, and forces bridge deck concrete protuberance, cracking, and more rainwater is infiltrated, and further worsens steel work, influences the safe in utilization of cable stayed bridge.Detection data according to many real bridges shows, anchor arm-tie reason for corrosion is except following casing ponding, shock absorber, sealing ring come off, rainwater flows into the connecting cylinder along PE, PU interlayer, and main reason is that rainwater oozes downwards along the slit of anchor arm-tie and bridge deck concrete plate; In case the problems referred to above appear, need be when keeping in repair to " rigid waterproofing ", to have to layer (bridge deck) concrete of mating formation of whole anchorage zone removed reconstruction, and damage area is big, and is time-consuming, take a lot of work, and influences the normal use of bridge.
Summary of the invention
The objective of the invention is for steel-mix the job practices of bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure is provided, when solving present method for rigid waterproof construction and can't solve defective that rainwater oozes along the slit of anchor arm-tie and bridge deck concrete plate and maintenance cost downwards, the technical problem of taking a lot of work.
For solving the problems of the technologies described above, realize as follows in the job practices of steel of the present invention-mix bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure: the first step shifts to an earlier date the precast concrete bridge deck; Second step is after installing the precast concrete bridge deck with the form of reserving notch on the steel girder and between the anchor arm-tie, cast-in-situ concrete in the notch of between precast concrete bridge deck and anchor arm-tie, reserving again, after the maintenance, at concrete surface and precast concrete bridge deck external coating waterproof agent; The 3rd step stretched out at the anchor arm-tie and lays the flexible isolating material block on the cast-in-place concrete surface, and the flexible isolating material block after the laying is the skewback that leans on and fit tightly the anchor arm-tie; The 4th step was smeared the waterproof film that waterproofing materials forms on flexible isolating material block surface and with the precast concrete bridge deck surface of flexible isolating material block connection; The 5th step had on the surface lays the bituminous concrete deck paving on the precast concrete bridge deck of waterproof film and the flexible isolating material block.
Adopt the job practices of the steel-mixed bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure of technical scheme of the present invention, because adopting the flexible isolating material block that the anchor arm-tie is stretched out bridge deck partly lays, the flexible waterproof material piece of laying has the characteristic of waterproof and can adapt to relative deformation between anchor arm-tie and the surrounding concrete, can avoid water from anchor arm-tie and the infiltration of the slit between the bridge deck concrete on every side, avoid anchor arm-tie and steel girder therefore to be corroded; Simultaneously, because the flexible waterproof material separation layer is arranged on the concrete slab and be sloping type around the anchor arm-tie is downward-sloping, water can not stop at anchor arm-tie " root ", along the slope arrange naturally to around; Simultaneously, even if need be when keeping in repair near the anchor arm-tie, do not need the precast concrete bridge deck of the anchorage zone of whole anchor arm-tie are removed reconstruction, only need remove reconstruction to the flexible isolating material block of cast-in-place concrete (not needing dismantling concrete) or laying gets final product, damage area is little big, saves time, the saving of labor.
Process is experimental results show that, it is to carry out in 180 days to finish that concrete major part is contracted in the length of time, need shift to an earlier date more than 180 days prefabricatedly so further limit steel of the present invention-the mix precast concrete bridge deck that adopt in the job practices of bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure, just can avoid producing shrinkage crack between the cast-in-situ concrete in the reservation notch between precast concrete bridge deck and the anchor arm-tie.
Same reason, process is to experiment showed, that high-strength expansive concrete only just can reach the expectation limited expansion rate at moisture-keeping maintaining more than 18 days; In embodiment of the present invention, only the limited expansion rate of restricted high-strength expansive concrete is to produce certain precompression between high-strength expansive concrete and the anchor arm-tie that could guarantee more than 2.5/10000ths to reserve in the notch, guarantees that both combine closely to prevent the crack generation.
Further the waterproof agent that adopts in the job practices of restriction steel of the present invention-mixed bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure is FTY-1 and FTY-2, in its job practices is: the first road brushing FTY-1, twice, the second road brushing FTY-2 three times.Adopt above-mentioned waterproof technology, because FTY-1 type water-repellent paint is by the synthetic one-component liquid coating of multiple macromolecule modified material, be used with the agent of FTY-2 type bridge deck water-proof and can obtain better waterproof effect, wherein, FTY-2 type bridge deck water-proof agent (product standard GB18445-2001) is that white is transparent, nontoxic nothing is smelt, the aqueous inorganic solution that does not fire, has the closely knit and hydrophobic dual-use function of unique infiltration, can infiltrate inside concrete 10～30mm rapidly after being sprayed on the bridge deck concrete surface, form the crystallization dense layer in inside, concrete surface layer pore and microscopic checks are stopped up in sealing, simultaneously form fluid-tight water-repellent layer at concrete surface, be used with FTY-1 type bridge floor waterproofing paint, form the defence line, second road of bridge deck water-proof, but also spary uses separately in concrete surface.
Further the flexible isolating material that adopts in the job practices of restriction steel of the present invention-mixed bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure is hard foamed polyurethane packing material, it has easy construction, quick, inexpensive characteristics, and after changing, bridge force-bearing and functional performance are had no effect.
The construction temperature that further limits hard polyurethane fat in its job practices is preferably 15 ℃～30 ℃, and temperature is too high or too low all can to influence its foamable reaction, and especially temperature is crossed the low foaming that is difficult for; If when spray, wind speed was excessive, then spray foam and fly upward not easy to operately, not only waste material, and the environment around polluting is so the wind speed during construction is difficult for above 5m/s.
In addition, further restriction waterproof film of the present invention is a polyurethane water-proof paint, because polyurethane water-proof paint has excellent oil resistant, wear-resisting, anti-ozone, resisting sea water erosion and certain alkaline resistance properties, soft, high resilience, compliance flexible to basic unit and cracking is strong, and adhesive property is good, and because polyurethane water-proof paint is a kind of amorphous thick substances before solidifying, so construct easily for complex-shaped anchor arm-tie; And polyurethane water-proof paint, rigid polyurethane foam plastics and concrete have good adhesion stress, concrete and rigid polyurethane foam plastics can be bonded together in its hardening process.Simultaneously, limit the width of rebate reserved between described anchor arm-tie and the precast concrete bridge deck less than 300mm; Described waterproof film coating scope is along more than the outside 1000mm in anchor arm-tie edge, such structural limitations, can guarantee that waterproof film is enough to cover coating and covers the notch of reserving between anchor arm-tie and the precast concrete bridge deck, the assurance rainwater can be along the junction between anchor arm-tie and flexible isolating material block, flexible isolating material block and the precast concrete bridge deck seepage down.
Further, the ramp rate that limits the flexible isolating material block that is skewback described in the job practices of described steel-mix bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure is 1: n, wherein the span of n is 1 to 5, such ramp rate can guarantee rainwater along domatic smooth naturally row to around, can guarantee the convenience of laying again.
Description of drawings
Below in conjunction with the drawings and specific embodiments embodiment of the present invention is described in further detail:
Fig. 1 is the steel finished of job practices of the present invention-the mix schematic diagram of bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure.
The specific embodiment
The inventive method is used in the construction of waterproof construction of newly-built steel-mix bondbeam cable stayed bridge anchor arm-tie, or the steel that is used to build up-the mix waterproof construction rebuilding construction of bondbeam cable stayed bridge anchor arm-tie.
As shown in Figure 1,1 expression steel-mixed bondbeam cable stayed bridge steel girder; 2 expression anchor arm-ties; 3 expression precast concrete bridge deck; 4 expression flexible isolating material blocks; 5 expression waterproof films; The cast-in-place concrete of 6 expressions; 7 expression bituminous concrete deck pavings; 8 expression waterproof agents.
Concrete job practices is as follows:
The first step is 180 days precast concrete bridge deck 3 in advance;
After second step installed precast concrete bridge deck 3 at steel-mix on the bondbeam cable stayed bridge steel girder 1 and between the anchor arm-tie 2 with the form of reserving notch, the width of rebate of reserving is 28mm, cast-in-place concrete is high-strength expansive concrete 6 in the notch of reserving between precast concrete bridge deck 3 and anchor arm-tie 2 again, the intensity of high-strength expansive concrete 6 is more than the C60, limited expansion rate is more than 2.5/10000ths, the moisture-keeping maintaining time is more than 18 days, after the maintenance, on concrete 6 surfaces and precast concrete bridge deck 3 external coating waterproof agents 8, this waterproof agent 8 is FTY-1 and FTY-2, the first road brushing FTY-1, twice, the second road brushing FTY-2 three times.
The 3rd step stretched out at the anchor arm-tie and lays flexible isolating material block 4 on cast-in-place concrete 6 surfaces, and the flexible isolating material block 4 after the laying is the skewback that leans on and fit tightly anchor arm-tie 2; Flexible isolating material 4 is hard foamed polyurethane packing materials, during filling flexible isolated material 4, requires to adopt spraying coating process, and the wind speed during construction is less than 5m/s, and construction temperature is preferably 15 ℃～30 ℃, and the ramp rate of flexible isolating material block 4 is 1: 2.5.
The 4th step was smeared the waterproof film 5 that waterproofing materials forms in precast concrete bridge deck 3 surfaces of 4 junctions mutually on flexible isolating material block 4 surfaces and with the flexible isolating material block, waterproof film 5 is a polyurethane water-proof paint, and waterproof film 5 coating scopes are along the outside 1000mm in anchor arm-tie edge.
The 5th step had on the surface lays bituminous concrete deck paving 7 on the precast concrete bridge deck of waterproof film 5 and the flexible isolating material block.
Above-described only is one embodiment of the present invention, should be pointed out that for a person skilled in the art, under the prerequisite that does not break away from the inventive method, can also make some changes and improvements, shift to an earlier date precast concrete bridge deck 3 as shifting to an earlier date the time longer more than 180 days; Reserving width of rebate can be 100mm, also can be 150mm, 200mm etc., as long as the too too not wide 300mm that surpasses, having influence on the safe in utilization of cable stayed bridge can; In addition, the ramp rate of flexible isolating material block 4 is tested, through test, ramp rate is can 1: 1; 1: 1.5; 1: 2; 1: 2.5; 1: 3; 1: 4; , can both guarantee that water discharges naturally along the slope at 1: 5 o'clock; Same reason; as long as waterproof film 5 coating scopes can reach and cover coating to cover the notch of reserving between anchor arm-tie and the precast concrete bridge deck just passable; usually for safety; usually be set at waterproof film coating scope along the outside 1000mm in anchor arm-tie edge with first-class; these also should be considered as protection scope of the present invention, and these can not influence effect of the invention process and practical applicability.The present invention is as a kind of application of the construction of the waterproof construction of steel-mixed bondbeam cable stayed bridge anchor arm-tie, carry out anchor arm-tie waterproof construction when transforming for the steel that has built up-mix bondbeam cable stayed bridge, only need to remove deck paving among a small circle around the anchor arm-tie, can carry out the construction of this structure.
Claims (8)
1. steel-mix the job practices of bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure is characterized in that:
Comprise following concrete steps,
The first step shifts to an earlier date the precast concrete bridge deck;
Second step is after installing the precast concrete bridge deck with the form of reserving notch on the steel girder and between the anchor arm-tie, cast-in-situ concrete in the notch of between precast concrete bridge deck and anchor arm-tie, reserving again, after the maintenance, at concrete surface and precast concrete bridge deck external coating waterproof agent;
The 3rd step stretched out at the anchor arm-tie and lays the flexible isolating material block on the cast-in-place concrete surface, and the flexible isolating material block after the laying is the skewback that leans on and fit tightly the anchor arm-tie;
The 4th step was smeared the waterproof film that waterproofing materials forms on flexible isolating material block surface and with the precast concrete bridge deck surface of flexible isolating material block connection;
The 5th step had on the surface lays the bituminous concrete deck paving on the precast concrete bridge deck of waterproof film and the flexible isolating material block.
2. steel as claimed in claim 1-mix the job practices of bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure is characterized in that: described precast concrete bridge deck are in advance prefabricated more than 180 days.
3. the job practices of steel as claimed in claim 1-mixed bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure, it is characterized in that: described cast-in-place concrete is high-strength expansive concrete, its intensity is more than the C60, and limited expansion rate is more than 2.5/10000ths, and the moisture-keeping maintaining time is more than 18 days.
4. steel as claimed in claim 1-mix the job practices of bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure, it is characterized in that: described waterproof agent is FTY-1 and FTY-2, the first road brushing FTY-1, twice, the second road brushing FTY-2 three times.
5. steel as claimed in claim 1-mix the job practices of bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure, it is characterized in that: described flexible isolating material is hard foamed polyurethane packing material.
6. steel as claimed in claim 5-mix the job practices of bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure, it is characterized in that: the construction temperature of described hard foamed polyurethane packing material is preferably 15 ℃～30 ℃; Adopt spraying coating process when described hard polyurethane fat packing material is filled, the wind speed during construction is less than 5m/s.
7. steel as claimed in claim 1-mix the job practices of bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure, it is characterized in that: the width of rebate of reserving between described anchor arm-tie and the precast concrete bridge deck is less than 300mm; Described waterproof film is a polyurethane water-proof paint, and waterproof film coating scope is along more than the outside 1000mm in anchor arm-tie edge.
8. steel as claimed in claim 1-mix the job practices of bondbeam cable stayed bridge anchor arm-tie waterproof isolation structure, it is characterized in that: the described ramp rate that is the flexible isolating material block of skewback is 1: n, wherein the span of n is 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010121521 CN102191750B (en) | 2010-03-10 | 2010-03-10 | Construction method for waterproof isolation structure of anchor plate of cable-stayed bridge by adopting steel-concrete composite beam |
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| CN 201010121521 CN102191750B (en) | 2010-03-10 | 2010-03-10 | Construction method for waterproof isolation structure of anchor plate of cable-stayed bridge by adopting steel-concrete composite beam |
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| CN102191750A true CN102191750A (en) | 2011-09-21 |
| CN102191750B CN102191750B (en) | 2013-03-27 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103469732A (en) * | 2013-09-22 | 2013-12-25 | 中建八局第三建设有限公司 | Construction method of preformed holes for foundation bolts of bridge support |
| CN103556564A (en) * | 2013-10-31 | 2014-02-05 | 福州大学 | Assembly-type slab bridge on basis of connection of steel diaphragm plates and construction method thereof |
| CN103898834A (en) * | 2014-04-24 | 2014-07-02 | 四川省交通运输厅公路规划勘察设计研究院 | Concrete-filled steel tube composite beam and trussed cable tower cable-stayed bridge and construction method thereof |
| CN104532738A (en) * | 2014-12-24 | 2015-04-22 | 福州大学 | Device for improving horizontal anti-seismic property of T-shaped concrete beam bridge and construction method thereof |
| CN105421212A (en) * | 2015-06-09 | 2016-03-23 | 吉林省银河水利水电新技术设计有限公司 | Single tower cable-stayed bridge with unsymmetrical plane broken line arranged bridge deck and building method thereof |
| CN105695872A (en) * | 2016-02-16 | 2016-06-22 | 浙江恒立粉末冶金有限公司 | Pre-diffusion bonding powder for powder metallurgy, manufacturing method thereof and method for manufacturing oil bearing through pre-diffusion bonding powder |
| CN105926423A (en) * | 2016-04-15 | 2016-09-07 | 浙江大学 | Composite beam type bridge floor continuation device and bridge floor continuation method applied in hollow slab girder bridges |
| CN106894328A (en) * | 2017-02-20 | 2017-06-27 | 重庆大学 | A kind of processing method of Π shapes bondbeam Shear Lag |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469732B (en) * | 2013-09-22 | 2015-07-15 | 中建八局第三建设有限公司 | Construction method of preformed holes for foundation bolts of bridge support |
| CN103469732A (en) * | 2013-09-22 | 2013-12-25 | 中建八局第三建设有限公司 | Construction method of preformed holes for foundation bolts of bridge support |
| CN103556564A (en) * | 2013-10-31 | 2014-02-05 | 福州大学 | Assembly-type slab bridge on basis of connection of steel diaphragm plates and construction method thereof |
| CN103556564B (en) * | 2013-10-31 | 2016-06-29 | 福州大学 | A kind of assembled slab bridge based on the connection of steel diaphragm plate and construction method thereof |
| CN103898834B (en) * | 2014-04-24 | 2016-07-27 | 四川省交通运输厅公路规划勘察设计研究院 | A kind of steel tube concrete combination beam and truss-like Sarasota cable-stayed bridge and construction method thereof |
| CN103898834A (en) * | 2014-04-24 | 2014-07-02 | 四川省交通运输厅公路规划勘察设计研究院 | Concrete-filled steel tube composite beam and trussed cable tower cable-stayed bridge and construction method thereof |
| CN104532738A (en) * | 2014-12-24 | 2015-04-22 | 福州大学 | Device for improving horizontal anti-seismic property of T-shaped concrete beam bridge and construction method thereof |
| CN105421212A (en) * | 2015-06-09 | 2016-03-23 | 吉林省银河水利水电新技术设计有限公司 | Single tower cable-stayed bridge with unsymmetrical plane broken line arranged bridge deck and building method thereof |
| CN105695872A (en) * | 2016-02-16 | 2016-06-22 | 浙江恒立粉末冶金有限公司 | Pre-diffusion bonding powder for powder metallurgy, manufacturing method thereof and method for manufacturing oil bearing through pre-diffusion bonding powder |
| CN105695872B (en) * | 2016-02-16 | 2017-07-11 | 浙江恒立粉末冶金有限公司 | A kind of method that oiliness bearing is manufactured for the prediffusion combining powder and its manufacture method of powder metallurgy and using the powder |
| CN105926423A (en) * | 2016-04-15 | 2016-09-07 | 浙江大学 | Composite beam type bridge floor continuation device and bridge floor continuation method applied in hollow slab girder bridges |
| CN105926423B (en) * | 2016-04-15 | 2018-06-12 | 浙江大学 | It is a kind of applied to the combination beam type bridge floor continuation apparatus of Hollow Slab Beam Bridge and bridge floor continuation method |
| CN106894328A (en) * | 2017-02-20 | 2017-06-27 | 重庆大学 | A kind of processing method of Π shapes bondbeam Shear Lag |
| CN106894328B (en) * | 2017-02-20 | 2018-11-23 | 重庆大学 | A kind of processing method of Π shape bondbeam Shear Lag |
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