CN102828468B - Construction method for controlling prefabricated crack of high-strength thin-walled box girder under high-temperature dry condition - Google Patents
Construction method for controlling prefabricated crack of high-strength thin-walled box girder under high-temperature dry condition Download PDFInfo
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Abstract
The invention provides a construction method for controlling a prefabricated crack of a high-strength thin-walled box girder under a high-temperature dry condition. The construction method sequentially comprises the following steps of: construction field prefabricating; shaping steel template manufacturing; test section manufacturing to optimize a concrete proportion; base plate and web reinforcement manufacturing and mounting; outer side template installing; pre-stress channel corrugated pipe installing; shaping inner template installing; anchor installing; top plate reinforcement installing; concrete casting and maintaining; pre-stress steel beam punching and tensioning; and pre-stress channel grouting and anchor sealing. The hydration heat temperature generated by concrete is reduced effectively, a box girder is prevented from cracking under the high-temperature dry condition, and the surface appearance achieves the effect of clear water concrete; the quality problems such as low hole forming rate of a pre-stress channel and incomplete vibrating, cracking and the like of the concrete of the outer wall of the box girder under the high-temperature condition are prevented effectively; the quality problems such as incomplete vibrating, cracking and the like happened in the prefabricating process of the high-strength thin-walled box girder under the high-temperature dry condition can be avoided effectively, and the appearance quality reaches the effect of the clear water concrete.
Description
Technical field
The present invention relates to International Classification of Patents patent classification E01D bridge technology, especially high intensity thinner tube prefabricated box-beam Crack Control construction method under high temperature drying environment.
Background technology
Prefabricated case beam is generally applied in science of bridge building, and current prestress box beam makes mainly traditional method of constructing, and comprising: by interface dimensions inside and outside precast splice type set shaped steel formwork or plank sheathing control cabinet beam; Outside typified form is installed after base plate, web reinforcement colligation complete; Lay prestressed pore passage and qualified by inspection after put into sizing inner formword; Blocking plate and anchor plate are installed; Roof steel bar is installed; Concreting also regularly to be sprinkled water maintenance; Concrete strength removes internal mold and external mold after reaching the strength of mould stripping of design permission; Penetrate prestress wire and ground tackle is installed, after the stretch-draw intensity reaching design permission, adopting jack to carry out tension of prestressed tendon; The slip casting work to prestress pipe is completed in 48 hours after stretch-draw is qualified; Non-shrinkage concrete is adopted to carry out sealing off and covering anchorage to prestressed girder head.Patents document is less.Such as:
Chinese Patent Application No. 201,010,297,694 1 kinds of pretensioned prestressing reinforced concrete precast beams, comprise Liang Tihe and be embedded in prestress wire as main muscle in described beam body, described beam body is provided with stirrup, the part of described stirrup stretches out the upper surface of described beam body, it is characterized in that: the sidewall of described beam body is vertically arranged with multiple nibs, the end of described beam body is formed with breach in described steel strand wires extending area.And for example, Chinese Patent Application No. 201110296849 Prefabricated reinforced concrete box culvert.Comprise box culvert body, bellmouth is established in one end of described box culvert body, the other end establishes socket, be arranged with a steel ring be in outside female end outside described female end, between described steel ring inner circle and female end cylindrical, establish the flexible sealing interface extended outward from both gap locations.
It is almost again inevitable in prefabricated box-beam process, producing crack with prior art, before the experimental study device side of advanced person, the sightless micro crack of the naked eyes existed in concrete and reinforced concrete structure than discovery as usual not yet load-bearing, often with follow-up remedial measure up these slits are made to this prior art, such as, common adhesion crack refers to the crack on the bonding plane of aggregate and Behavior of Hardened Cement Paste, mainly occurs around aggregate; Behavior of Hardened Cement Paste crack refers to the crack in cement mortar, appears between aggregate and aggregate; Aggregate crack refers to the crack of aggregate itself.In these three kinds of cracks, first two is maximum, and aggregate crack is minimum.And the reason producing fine fisssure can be explained by concrete structural theory: be namely aggregate depending on concrete, the Inhomogeneous wave fields that Behavior of Hardened Cement Paste, gas, moisture etc. form, under temperature, humidity change condition, concrete progressively hardens, and produces cubic deformation simultaneously.This distortion is uneven, and Behavior of Hardened Cement Paste shrinks comparatively large, and aggregate shrinks less, the thermal coefficient of expansion of Behavior of Hardened Cement Paste is large, and aggregate is less, and the distortion between them is not freely, so produce mutual restraining force, this stress causes adhesion fine fisssure and Behavior of Hardened Cement Paste change to split, and just naked eyes be can not see.When concrete bearing load and gradually reinforcement time, fine fisssure starts to expand and increases, be extended to considerable crack even component destroy completely.It should be noted that temperature, deformation crack that the factor of shrinkage causes is more outstanding, its architectural feature is out of shape at the structural requirement of inside concrete, internal stress is produced when suffering restraints and limit, stress produces crack after exceeding agent on crack resistance of concrete stress value, after crack occurs, distortion is met, internal stress relaxation, this crack is little on bearing capacity impact, but large to durability infringement.According to relevant survey data, in engineering practice works belong to by temperature, contraction, differential settlement be out of shape cause crack account for 80%, what belong to that load causes crack accounts for about 20%; Simultaneously, also identical analysis is had according to concrete basic physico-mechanical properties theory, concrete contraction distortion facts have proved, the reason of major part concrete structure crack is because the distortion such as temperature, humidity causes, and humidity changes the crack caused and accounts for major part, and this is as can be seen from concrete structure, concrete important component part is cement and water, by the hydration of cement and water, form cementing material, loose sandstone aggregate is composed artificial stone body concrete.Inside a large amount of space of concrete, gross porosity and pore, there is large quantity of moisture, the Activity Effects of moisture is to concrete series of properties, and the character fracture control particularly producing " humidity distortion " plays an important role.The volume of case beam is little, belongs to thin-wall construction, controls concrete contraction fissure and should not take measures according to the requirement of mass concrete.Although thin-wall construction rises at the very end due to the temperature that heat-transmission causes, but concrete itself shrinks very large, particularly unfavorable for thin-wall construction with contraction acting in conjunction in ambient air temperature change especially, moreover, due to the unequal reason of the walled thickness of building, thus there is the problem that stress is concentrated more or less.Its reason is summarized as follows: pump concrete cement consumption is more, sand coarse aggregate ratio is higher, aggregate size is less than normal, the ratio of mud increases, adopt pumping admixture, causes shrinking and heat of hydration increase; Strength grade of concrete improves the raising of strength grade of concrete increasingly, and cause cement consumption increase, sand coarse aggregate ratio is bigger than normal, aggregate size is less than normal etc. all makes the heat of hydration and shrink to increase; Structural constraint power constantly increases the increasingly sophisticated of version, normal employing redundant structure and cast-in-place construction, and this version has remarkable effect of contraction, must cause larger restraint stress to various metamorphosis; Ignore structural constraint in structural design, often ignore distributing bar importance.This reinforcing bar requires thin and close, to the effect of contraction fissure Constrained; Concrete tensile property is not enough, and people are concerned about it is that concrete compression strength has precedence over tensile strength, so little to the grating research of material tensile property; The larger humidity contraction distortion of the improper pump concrete of maintenance process requires the maintenance process adapting to it, not just watering, and wants temperature control maintenance; The sudden change of structural section is very important in this thin-wall construction design of case beam, and, often there is the prestress pipe of two layers the variable cross-section position that top board is connected with floor, and it is the place that whole cross section tension is the weakest, is easy to occur longitudinal crack there.
In known technology, along with ultra-wide degree, the extensive use of Longspan Bridge road engineering in road and bridge engineering, for multispan continuous prestress box beam fabricated construction occurs gradually many, and prefabricated box-beam is the key determining total construction quality.
For under high temperature drying environment, to reduce and to avoid the construction control method for the purpose of crack rare open during high-strength thin-walled prefabricated box-beam.
Summary of the invention
The object of this invention is to provide high intensity thinner tube prefabricated box-beam Crack Control construction method under a kind of high temperature drying environment, use this engineering method effectively can ensure the construction quality of prefabricated case beam under hot environment drying.
Goal of the invention of the present invention is realized by following technical measures: construction method is followed successively by: construction site is prefabricated, set shaped steel formwork makes, and make test section optimised coagulation soil match ratio, base plate, web reinforcement manufacture installation, outboard template is installed, prestressed pore passage bellows is installed, and sizing inner formword is installed, anchorage installation, roof steel bar is installed, concreting and maintenance, prestressed strand perforation, stretch-draw, and prestressed pore passage grouting, sealing off and covering anchorage.Outer mold top and bottom one determining deviation establish Screw arbor with nut at both-ends one place, both sides external mold is suitable for reading welds door shape formwork reinforcement muscle symmetrically, wearing sufficient intensity square steel tube in gate rinforcement bar coordinates location peg to carry out fastening, evenly arranges 2 place's steel circular cylindrical limited blocks between every root steel square tube and internal mold top simultaneously; Before the batch production of case beam, adopt laboratory examination to join concrete and build test section at the scene; Meanwhile, adopt " two mix " method optimised coagulation soil match ratio, guarantee concrete workability, intensity, durability under hot conditions; Stress duct adopts metal bellows pore-forming, penetrates elongated pvc pipe and carries out shutoff to termination simultaneously in bellows, when laying prestressing force bellows, accurately locates, adopt " well " shape spacer bar to fix by steel bundle design coordinate; In addition, the junction block of suitable dimension is adopted to lay after metal bellows spreading; Tension of prestressed tendon takes two ends stretch-draw, stretching force and elongation dual control method; After completing stretch-draw, during mud jacking, control valve, drainage tube and returnable are set at slurry outlet, control, drainage and recovery are realized to slurry outlet grouting material.
The invention has the beneficial effects as follows: adopt " two mix " method optimised coagulation soil match ratio, the built-in pvc pipe of application prestressed pore passage, strengthens duct intensity, guarantee into porosity 100%, take the measures such as mat shelter shelters from heat or light, watering to lower the temperature to template surface, reinforcing bar before building, and select the concreting time should avoid the high temperature period, effectively reduce the hydration heat temperature that concrete produces, guarantee high temperature drying environment nowel beam free from flaw, apparently reach clear-water concrete effect, effective prevention prestressed pore passage becomes porosity low, and the leakage of hot conditions nowel beam outer wall concrete is shaken, the quality problems such as cracking, there is construction simple, fast, be easy to grasp, to be applicable in mixed structure construction under high temperature drying environment, high-strength thin-walled box girder construction, under can effectively avoiding high temperature drying environment, the leakage occurred in strong concrete Thin-walled Box Girder prefabrication process is shaken, the quality problems such as cracking, apparent mass reaches clear-water concrete effect, overcome due to prestressed pore passage distortion in casting and compacting of concrete process, damaged, the poorly sealed common quality defect causing duct to be blocked, there is higher application and popularization value.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of construction method of the present invention
Detailed description of the invention
Below in conjunction with detailed description of the invention, set forth the present invention further.
Embodiment 1:
As shown in Figure 1, construction method is followed successively by: construction site is prefabricated, and set shaped steel formwork makes, make test section optimised coagulation soil match ratio, base plate, web reinforcement manufacture installation, and outboard template is installed, and prestressed pore passage bellows is installed, sizing inner formword is installed, anchorage installation, roof steel bar is installed, concreting and maintenance, prestressed strand perforation, stretch-draw, and prestressed pore passage grouting, sealing off and covering anchorage.
The present invention adopts sizing steel monolithic exterior sheathing and core, is numbered before use, assembles.Outer mold top and bottom one determining deviation establish Screw arbor with nut at both-ends one place, both sides external mold is suitable for reading welds door shape formwork reinforcement muscle symmetrically, wearing sufficient intensity square steel tube in gate rinforcement bar coordinates location peg to carry out fastening, evenly arranges 2 place's steel circular cylindrical limited blocks between every root steel square tube and internal mold top simultaneously.
The present invention is the concrete pouring quality of guard box beam, before the batch production of case beam, adopts laboratory examination to join concrete and builds test section at the scene; Meanwhile, adopt " two mix " method optimised coagulation soil match ratio, guarantee concrete workability, intensity, durability under hot conditions, design and construction requirement can be met.
The present invention determines single Pin box beam concrete transporting equipment quantity, bicycle freight volume according to concrete transportation distance, damage of collapsing, presetting period, analyzes the unfavorable conditions in casting process and the reason that may cause defect, determines construction technology.
In aforementioned, stress duct adopts metal bellows pore-forming, penetrates elongated pvc pipe and carries out shutoff to termination simultaneously in bellows, when laying prestressing force bellows, accurately locates, adopt " well " shape spacer bar to fix by steel bundle design coordinate.In addition, the junction block of suitable dimension is adopted to lay after metal bellows spreading.
In aforementioned, before concreting, take the measures such as mat shelter shelters from heat or light, watering to lower the temperature to template surface, reinforcing bar, select the time of building to avoid the high temperature period; After building end, the moisturizing of timely covering felt, top adopts the same length with case beam and fills the bar plastic water bag of water, and upper acupuncture treatment eye slowly drips, and makes concrete at curing period inner surface maintenance moisture state; Internal mold covers two ends with felt after removing, and tight with brick shutoff to two ends, case room, pours water health in case indoor.
In aforementioned, tension of prestressed tendon takes two ends stretch-draw, stretching force and elongation dual control method; After completing stretch-draw, during mud jacking, control valve, drainage tube and returnable are set at slurry outlet, control, drainage and recovery are realized to slurry outlet grouting material.
In the present invention, Specific construction technique comprises:
1, integrated planning is carried out to precasting yard, construction production area is centered by beam placenta processed, special cast trimming district is set between beam strorage area and beam making bench, faces limit at precasting yard and prestressed strand processing and fabricating district is set, Yun Liang circular passage and yard drain facility etc. are set.Fetal membrane carries out smooth rolling to place before making, and guarantees that foundation bearing capacity meets the demands, prevents side form from sinking.Loose tool adopts concrete and shaped steel, steel plate combination to make.
2, according to figure paper size set shaped steel formwork customized, and numbering marks assembled order in template.
3, by making 4m case beam test section, " two mix " method optimised coagulation soil match ratio, guarantees that concrete workability under hot conditions, intensity, durability can meet design and construction requirement, and make the casting craft of complete set.
4, at the fetal membrane subscript outlet beam baseplate reinforcing bar position line and colligation is shaping, adopt falsework to fix in advance during colligation, on web hooping, plum blossom-shaped arranges reinforced bar support, simultaneously install bin beam support built-in fitting, the dowel of embedded part answers firm welding, checks case beam two end bearing pre-embedded steel slab.
5, before outboard template is installed, evenly brush colourless releasing agent at template surface, exterior sheathing top and bottom one determining deviation establish Screw arbor with nut at both-ends one place, and adopt round steel to drawing reinforcing, double nut is tightened.Offside model sheetinstallat angle will strictly control, and carries out inner support at spacing intervals push up outward in length range suitable for reading with jackscrew.Bottom side form, according to vibrator coverage, several attached vibrators are installed.
6, prestressed pore passage adopts metal bellows pore-forming, adopts suitable linkers pipe to lay after metal bellows spreading, carries out watertightness inspection, and seal breakthrough by root.In bellows, penetrate elongated pvc pipe and shutoff is carried out to termination simultaneously, preventing duct from blocking.Ensure that bellows line style is smooth-going, adopt " well " shape spacer bar to fix.
7, inner membrance adopts sizing core.Carry out examination assembling, numbering before use, hand fit's truck crane assembling internal mold, controls internal mold installation site.At both sides external mold welding symmetrically suitable for reading door shape formwork reinforcement muscle, inside wearing sufficient intensity square steel tube coordinates location peg to carry out fastening, in order to guard box beam sectional dimension suitable for reading, 2 place's steel circular cylindrical limited blocks are evenly set between every root steel square tube and internal mold top simultaneously, use drift wedging between square tube and door shape muscle, prevent internal mold from floating.
8, pulled by anchor pad and be fixed by bolts on notch, bellows passes in anchor plate, and after blocking plate is in place, adjustment spiral bar position and anchor plate are combined closely, the gap between seal bellows and anchor plate.
9, roof steel bar colligation is carried out.
10, concreting is carried out in the qualified rear preparation of steel corrosion quantity.Take the measures such as mat shelter shelters from heat or light, watering to lower the temperature to template surface, reinforcing bar before building, select the concreting time should avoid the high temperature period.
After concrete transportation to scene, carry out the slump, air content detects, after reaching requirement, adopt the direct splicing of loading machine to put in storage, longitudinal continuous stratification is built, building sequentially of first base plate, trailing web, top board, and one-time-concreting completes; Placement layer by layer THICKNESS CONTROL, within 400mm, adopts form vibrator, vibrating head to coordinate and vibrates, forbade to shake, leak and shake; Internal mold top plate, base plate arrange portable plate and to hold concurrently peep hole as blanking hole, carry out piecemeal building and shutoff orifice plate in time; Manually twitch pvc pipe in bellows while building until concrete initial set, pvc pipe is extracted out; Concrete roof adopts plug-in type and flat vibrator with the use of, vibration compacting and plucking; After concreting terminates, the moisturizing of timely covering felt, top adopts the same length with case beam and fills the bar plastic water bag of water, and upper acupuncture treatment eye slowly drips, and makes concrete at curing period inner surface maintenance moisture state; Internal mold covers two ends with felt after removing, and tight with brick shutoff to two ends, case room, and pour water health in case indoor, curing time is 14 days.
11, prefabricated case beam concrete reaches 85% of design strength and can carry out prestressed stretch-draw after being greater than 7 days the age of concrete; Steel strand wires add active length determination blank size by design length, adopt abrasive wheel cutting machine cutting;
Two ends stretch-draw, stretching force and elongation dual control is adopted by design sequence.Stressing sequence is:
Installment work anchor → mounting limit plate → installation jack → erecting tools anchor → 10% σ
kinitial tensioning, and measure initial elongation value → 20% σ
kopen at the beginning of 2 times, and measure stretch value → 100% σ
kstretch-draw and measure stretch value → tension cylinder oil return, tear moveable anchor open → closedown oil pump, tension cylinder top-bearing jar resets → unload moveable anchor, jack successively; The error of prestress wire actual elongation value and theoretic elongation should control within 6%, otherwise should suspend stretch-draw, after ascertaining the reason and take measures to be adjusted, can continue stretch-draw.Workmen carries out stretch-draw record simultaneously.
12, after whole stretch-draw terminates, in 48 hours, carry out bellows vacuum grouting, with clean pressure flush of water duct before mud jacking, and dry up.During mud jacking, control valve, drainage tube and returnable are set at slurry outlet, control, drainage and recovery are realized to slurry outlet grouting material.Keep steady pressure to carry out mud jacking, reserve until grout outlet and after underflow, to hold valve-off after pressure 1min.
In the present invention, adhesion type coordinates with poker vibrator and vibrates, and felt covering, the micro-spray moisture-keeping maintaining of bar shaped water storage bag, case indoor are poured water health promotion technology; Sealing off and covering anchorage adopts non-shrinkage concrete, and strength grade of concrete improves one-level; The mucilage on anchor plate surface and anchor ring outside are cleaned out, simultaneously check without leak mud jacking bellows after, carry out sealing off and covering anchorage and with beam body concrete good bond, timely maintenance.
The present invention is simple to operate, easy construction, and by making case beam test section, " two mix " method optimised coagulation soil match ratio, guarantees that concrete workability under hot conditions, intensity, durability can meet design and construction requirement; The built-in pvc pipe of application prestressed pore passage, strengthens duct intensity, guarantees into porosity 100%; Take the measures such as mat shelter shelters from heat or light, watering to lower the temperature to template surface, reinforcing bar before building, and select the concreting time should avoid the high temperature period, effectively reduce the hydration heat temperature that concrete produces; Adopt adhesion type to coordinate with poker vibrator and vibrate, felt covering, the micro-spray moisture-keeping maintaining of bar shaped water storage bag, case indoor are poured water health promotion technology, guarantee high temperature drying environment nowel beam free from flaw, apparently reach clear-water concrete effect; By arranging control valve, drainage tube and returnable at slurry outlet, control, drainage and recovery being realized to slurry outlet grouting material and decreases waste of material and environmental pollution.Can the realm of building construction be widely used in, there is broad prospect of application.
The strong concrete pre-stressed box that this construction technology is applicable under high temperature drying environment is beam prefabricated, easy and simple to handle, and result of use is good, reaches the requirement of design, ensure that construction quality, has higher application and popularization value.
Claims (2)
1. high intensity thinner tube prefabricated box-beam Crack Control construction method under high temperature drying environment, is characterized in that: construction method is followed successively by: construction site is prefabricated, and set shaped steel formwork makes, make test section optimised coagulation soil match ratio, base plate, web reinforcement manufacture installation, and outboard template is installed, and prestressed pore passage bellows is installed, sizing inner formword is installed, anchorage installation, roof steel bar is installed, concreting and maintenance, prestressed strand perforation, stretch-draw, and prestressed pore passage grouting, sealing off and covering anchorage; Outer mold top and bottom one determining deviation establish Screw arbor with nut at both-ends one place, both sides external mold is suitable for reading welds door shape formwork reinforcement muscle symmetrically, wearing sufficient intensity square steel tube in gate rinforcement bar coordinates location peg to carry out fastening, evenly arranges 2 place's steel circular cylindrical limited blocks between every root steel square tube and internal mold top simultaneously; Before the batch production of case beam, adopt laboratory examination to join concrete and build test section at the scene; Meanwhile, adopt " two mix " method optimised coagulation soil match ratio, guarantee concrete workability, intensity, durability under hot conditions; Stress duct adopts metal bellows pore-forming, penetrates elongated pvc pipe and carries out shutoff to termination simultaneously in bellows, when laying prestressing force bellows, accurately locates, adopt " well " shape spacer bar to fix by steel bundle design coordinate; In addition, the junction block of suitable dimension is adopted to lay after metal bellows spreading; Tension of prestressed tendon takes two ends stretch-draw, stretching force and elongation dual control method; After completing stretch-draw, during mud jacking, control valve, drainage tube and returnable are set at slurry outlet, control, drainage and recovery are realized to slurry outlet grouting material.
2. high intensity thinner tube prefabricated box-beam Crack Control construction method under high temperature drying environment as claimed in claim 1, it is characterized in that, prefabricated case beam concrete reaches 85% of design strength and can carry out prestressed stretch-draw after being greater than 7 days the age of concrete; Steel strand wires add active length determination blank size by design length, adopt abrasive wheel cutting machine cutting; Two ends stretch-draw is adopted, stretching force and elongation dual control by design sequence; Stressing sequence is:
Installment work anchor → mounting limit plate → installation jack → erecting tools anchor → 10% σ
kinitial tensioning, and measure initial elongation value → 20% σ
kopen at the beginning of 2 times, and measure stretch value → 100% σ
kstretch-draw and measure stretch value → tension cylinder oil return, tear moveable anchor open → closedown oil pump, tension cylinder top-bearing jar resets → unload moveable anchor, jack successively; The error of prestress wire actual elongation value and theoretic elongation should control within 6%, otherwise should suspend stretch-draw, after ascertaining the reason and take measures to be adjusted, can continue stretch-draw.
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| CN103469805B (en) * | 2013-09-10 | 2015-07-29 | 叶长青 | The construction method of prestressing force raft foundation |
| CN205474786U (en) * | 2014-12-21 | 2016-08-17 | 湖南科技大学 | A multi -functional soil box type beam bridge that thoughtlessly congeals for double -deck traffic |
| CN105714666B (en) * | 2014-12-21 | 2019-01-15 | 湖南科技大学 | One kind being based on double-layer traffic concrete box-beam bridge lateral stiffening ring |
| CN105970823B (en) * | 2016-06-13 | 2017-11-24 | 中交第二航务工程局有限公司 | A kind of box girder inner formwork system that body is distorted for large span, superelevation |
| CN108459154B (en) * | 2018-05-16 | 2023-11-03 | 山东省公路桥梁建设有限公司 | Concrete wet joint test bed with constraint function and test method |
| CN109577186A (en) * | 2018-12-17 | 2019-04-05 | 山东汇通建设集团有限公司 | Overpass anti-collision wall crack resistence structure and construction |
| CN110983974B (en) * | 2019-11-21 | 2021-04-30 | 中交第二航务工程局有限公司 | Comprehensive maintenance method for concrete box girder construction in winter |
| CN111705666A (en) * | 2020-06-18 | 2020-09-25 | 宁波工程学院 | Method for controlling early cracks of prestressed concrete cast-in-place continuous box girder |
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| KR100214431B1 (en) * | 1997-03-06 | 1999-08-02 | 유성권 | Execution method and structure of expansion joints |
| KR100403390B1 (en) * | 2000-08-29 | 2003-10-30 | 주식회사 화신 | Construction Method of Bridge Deck Joints or Structure Junctions Using Polymer Modified Asphalt Sealant |
| CN102094385A (en) * | 2010-12-07 | 2011-06-15 | 中铁大桥勘测设计院有限公司 | Main girder of steel box composite girder with long cantilever arms for single-plane cable stayed bridge |
| CN202131559U (en) * | 2011-04-01 | 2012-02-01 | 河南省交通规划勘察设计院有限责任公司 | Corrugated steel web plate prestressed concrete continuous box girder |
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