CN101581071B - Method for reducing disadvantageous temperature effect on main girder structure of bridge and deck pavement structure - Google Patents
Method for reducing disadvantageous temperature effect on main girder structure of bridge and deck pavement structure Download PDFInfo
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- CN101581071B CN101581071B CN 200910027029 CN200910027029A CN101581071B CN 101581071 B CN101581071 B CN 101581071B CN 200910027029 CN200910027029 CN 200910027029 CN 200910027029 A CN200910027029 A CN 200910027029A CN 101581071 B CN101581071 B CN 101581071B
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Abstract
The invention relates to a method for reducing disadvantageous temperature effect on a main girder structure of a bridge and a deck pavement structure. The method is characterized by increasing a thermal insulation material layer between pavement layers or adding corresponding thermal insulation materials into each pavement layer to reduce or block the heat transfer between the main girder structure of the bridge and the deck. The method can reduce the gradient temperature loads of the main girder structure of the bridge, reduce the construction or maintenance cost of the bridge, and prolong the service life of the bridge structure.
Description
Technical field
The present invention relates to a kind of bridge construction, especially a kind of method and deck installation structure that reduces main beam structure gradient temperature effect, specifically a kind of method and deck installation structure that reduces the unfavorable gradient temperature effect of bridge main beam structure.
Background technology
Since the sixties, all found to cause owing to thermal stresses the accident of the serious rhegma of concrete bridge girder construction both at home and abroad.For example, the damage of several thick web box girders of Germany, wherein two bridge blocks almost cave in, and find in the inspection to German Jagst bridge web box girder, be open to traffic to find serious crack on the 5th year, through the estimated temperature tensile stress up to 2.6MPa; The U.S. changes Champigny Box Girder Bridge end reaction observes, fluctuation reaches 26% in one day, be equivalent to the case back of this counter-force changing value, the equivalent temperature difference of backplate surface is 10 ℃, only the maximum flange stress that is caused by this temperature difference just can reach 3.92MPa; The prestressed concrete box girder of a new markets viaduct of New Zealand, the temperature difference that produces because of sunshine causes this bridge that serious rhegma takes place, the expensive reparation of having to.Domestic, the crack has also all taken place in the clear bridge of tin, Tong Hui river continuous box girder, Jiujiang Bridge over Yangtse River access bridge case beam, Lijiang River two bridge case beams etc., and thermal (temperature difference) stress is considered insufficient substantial connection that has in the appearance in these cracks and the design.Engineering practice shows, must pay attention to the analysis of temperature effect and adverse effect thereof.
The thermal (temperature difference) stress of bridge construction is done many research work both at home and abroad, carried out a series of field trial observation and theoretical research.Along with the progress of experimental study work, Chinese scholars begins to recognize along the distribution of the linear property of concrete structure temperature inside distribution right and wrong.In the concrete continuous bridge, thermal stresses can reach even exceed life-load stress, is considered to concrete beam bridge and produces one of the major reason in crack.Engineering design and structural analysis for the ease of bridge, on the basis to the analysis of bridge actual observation, states such as the U.S., Japan, Britain, New Zealand and China traffic department are in bridge design standard clause, the Temperature Distribution that bridge construction is acted on lower edge bridge construction girder section height at sunshine has proposed computation schema separately, and all characterizes the nonlinear Distribution condition of this temperature with gradient temperature.
Solar radiation, hard pitch concrete speading (up to 150 ℃) or there's a sudden fall in temperature causes that the bridge construction girder is inner and produce vertical gradient temperature, and then produce disadvantageous thermal stresses, particularly be prone to the cracking disease for concrete-bridge, influence the durability of bridge construction.For this reason, America and Europe and Bridges in Our Country design specifications are all considered gradient temperature as the design load of bridge construction in design reference period.A large amount of calculating according to the Bridges in Our Country design specifications show, the stress that the gradient temperature load produces bridge construction is near life-load stress, even surpass the stress that mobile load produces, and become one of primary load of control design.
At present engineering circle is handled the principle of the vertical gradient temperature of bridge construction and is: it is considered as design load, take measures to bear the adverse effect that it brings from structure self angle is passive.Such as strengthening bridge construction girder section size, increasing steel bar stress consumption etc., this has just increased construction cost widely, and because the effect repeatedly of altitude temperature difference effect, still can cause the main beam structure cracking, reduction of service life, increase the maintenance operation cost, this problem does not still have better solution at present.
Summary of the invention
The objective of the invention is to cause construction cost to increase at generally gradient temperature being designed the bridge main beam structure as design load in the existing bridge design and can't fundamentally solve the problem that unfavorable gradient temperature effect is brought, invent a kind of method that reduces the unfavorable gradient temperature effect of bridge main beam structure, provide a kind of new deck installation structure to be subjected to the stress that bridge floor conducts heat to be influenced and produce to reduce the bridge main beam structure as much as possible simultaneously.
One of technical scheme of the present invention is:
A kind of method that reduces disadvantageous temperature effect on main girder structure of bridge one of is characterized in that at least in the following manner realizing:
(1) in the waterproof concrete layer on surface, adds the thermal insulation material, have the thermal insulation waterproof concrete layer of mating formation in order to form at bridge main beam structure end face;
(2) insulating layer that one deck is made up of pressure-resistant material of mating formation between bridge main beam structure and waterproofing course is in order to reduce or block the heat of surperficial concrete pavement layer to the internal delivery of bridge main beam structure;
(3) in the waterproofing course between bridge main beam structure and concrete pavement layer, add the thermal insulation material, so that the water-proof thermal-insulation layer that one of formation can reduce or intercept heat is transmitted between bridge main beam structure and concrete pavement layer;
(4) in the waterproof concrete leveling layer between asphalt concrete pavement layer and bridge main structure, add thermal insulation material formation thermal insulation waterproof concrete leveling layer, the interchange of heat between blocking-up and minimizing asphalt concrete pavement layer and the bridge main beam structure;
(5) between waterproofing course and concrete leveling layer, increase shop one deck insulating layer, reduce or block heat transmission between surperficial asphalt concrete pavement layer and the concrete leveling layer;
(6) add the thermal insulation material in the waterproofing course, form the water-proof thermal-insulation layer, to reduce or to block heat transmission between surperficial asphalt concrete pavement layer and the concrete leveling layer;
(7) add the thermal insulation material in the asphalt concrete pavement layer on surface, form the thermal insulation asphalt concrete pavement layer, to reduce or to block heat transmission between surperficial asphalt concrete pavement layer and the waterproofing course.
Two of technical scheme of the present invention is:
A kind of deck installation structure that reduces disadvantageous temperature effect on main girder structure of bridge, comprise waterproofing course 2 and the concrete pavement layer 3 of mating formation successively on bridge main beam structure 1, it is characterized in that being provided with insulating layer 4 between waterproofing course 2 and the bridge main beam structure 1 and/or between waterproofing course 2 and the concrete pavement layer 3, the thickness of described insulating layer 4 is 1-100mm, and coefficient of thermal conductivity is not more than 0.8W/mk.
Be mixed with the heat-barrier material of forming insulating layer 4 in described concrete pavement layer 3 or the waterproofing course 2.
Described insulating layer 4 is made by fibrous thermal insulation material, cellular thermal insulation material or stratiform thermal insulation material; Described fibrous thermal insulation material comprises glass wool, rock mineral wool, aluminium silicate wool and goods thereof, and is one or more combination in the fibrous plate made of raw material with straw, disregard message stationery organic fiber; Described cellular thermal insulation material comprises one or more the combination in expanded perlite, expanded vermiculite, microporous silicate, litaflex, foam glass, gas concrete, foamed plastics, haydite concrete or the foam concrete; Described stratiform thermal insulation material comprises aluminium foil, metal or nonmetal coated glass and is one or more combination in the plated film goods of base material with the fabric.
Three of technical scheme of the present invention is:
A kind of deck installation structure that reduces disadvantageous temperature effect on main girder structure of bridge comprises concrete leveling layer 5, waterproofing course 2 and the asphalt concrete pavement layer 6 of mating formation successively on bridge main beam structure 1, it is characterized in that:
(a) between asphalt concrete pavement layer 6 and waterproofing course 2;
(b) between waterproofing course 2 and concrete leveling layer 5;
(c) between bridge main beam structure 1 and concrete leveling layer 5;
Have at least one to be provided with insulating layer 4 in above-mentioned (a) and (b), (c), the thickness of described insulating layer 4 is 1～100mm, and coefficient of thermal conductivity is not more than 0.8W/mk.
Have at least one to be mixed with the heat-barrier material of forming insulating layer 4 among described asphalt concrete pavement layer 6, waterproofing course 2 and concrete leveling layer 5 threes.
Described insulating layer 4 is made by fibrous thermal insulation material, cellular thermal insulation material or stratiform thermal insulation material; Described fibrous thermal insulation material comprises glass wool, rock mineral wool, aluminium silicate wool and goods thereof, and is one or more combination in the fibrous plate made of raw material with straw, disregard message stationery organic fiber; Described cellular thermal insulation material comprises one or more the combination in expanded perlite, expanded vermiculite, microporous silicate, litaflex, foam glass, gas concrete, foamed plastics, haydite concrete or the foam concrete; Described stratiform thermal insulation material comprises aluminium foil, metal or nonmetal coated glass and is one or more combination in the plated film goods of base material with the fabric.
Beneficial effect of the present invention:
The present invention is applied to insulating layer in the deck installation structure first audaciously, and has gone out the relation between the high gradient temperature in thickness, coefficient of thermal conductivity and bridge deck surface of insulating layer through a large amount of Test Summaries, has drawn the pavement thickness of conventional thermal insulation material.Evidence is by increasing insulating layer in the deck paving process, can effectively stop importing into or the outflow of internal heat (as solar radiation, there's a sudden fall in temperature and hard pitch concrete speading etc.) of outside heat, keep bridge construction beam body temperature degree along the ability of vertical stability, perhaps produce as far as possible little vertical gradient temperature, reduce the stress fluctuation that the bridge main beam structure causes because of variations in temperature.
The present invention compares with the bridge now commonly used system of mating formation except effectively reducing the vertical gradient temperature of bridge construction girder, also has following advantage:
(1) bridge construction solar radiation, there's a sudden fall in temperature and situation such as hard pitch concrete speading under, the present invention can make bridge construction beam body temperature degree along the stable ability of vertical maintenance, perhaps produces as far as possible little vertical gradient temperature;
(2) reduction of the vertical gradient temperature of bridge construction can effectively improve the force-bearing situation of bridge construction;
1. reducing of gradient temperature load, and then bring the bridge construction sectional dimension to reduce reduction with material usage, corresponding the reducing of beam body deadweight, the design load of bridge substructure also reduces synchronously.Thereby reduce the construction cost of bridge significantly.
2. a large amount of theory analysises and experiment show, after in the bridge deck pavement insulating layer being set, by adjusting insulating layer material thermal conductivity and thickness thereof, the gradient temperature peak value of bridge deck end face can descend 30%～70%.This shows, adopt after the deck paving thermal insulation system among the present invention, will provide a kind of effective means and method of improving unfavorable thermal stresses to the new bridge structure design with at the maintenance and renovation of using as a servant bridge, finally produce considerable society and economic benefit.
3. the present invention not only can be used for also can be used in the bridge design constructions such as overhead road of city, speedway, pedestrian overcrossing in cross a river, river, the design and construction of sea-bridge beam, and economic benefit is fairly obvious.Namely both can be used for highway bridge construction, also can be used in the municipal bridge construction.
4, be the part measured data of insulating layer when adopting different-thickness and material (at subjects, continuous 1 year carry out tracking observation) below, the high gradient temperature in the bridge deck surface of λ in the table=1.6 and λ=when provision for thermal insulation is not adopted in 1.0 expressions.
When (1) bridge floor adopts the thick concrete pavement of 5cm, install the high gradient temperature of isolation layer back axle panel surface additional.
(2) bridge floor adopts the 10cm concrete pavement, adds the high gradient temperature of heat-barrier material back axle panel surface in waterproofing course
(3) bridge floor adopts concrete pavement, adds the high gradient temperature of heat-barrier material back axle panel surface in concrete pavement layer
(4) bridge floor adopts the 5cm asphalt concrete pavement, adds the high gradient temperature of heat-barrier material back axle panel surface in waterproofing course
(5) bridge floor adopts asphalt concrete pavement, adds the high gradient temperature of heat-barrier material back axle panel surface in bituminous concrete
When (6) bridge floor adopts the thick asphalt concrete pavement of 5cm, in the concrete leveling layer, add the high gradient temperature of heat-barrier material back axle panel surface
Description of drawings
Fig. 1 is one of bridge construction schematic diagram of the present invention.
Fig. 2 is two of bridge construction schematic diagram of the present invention.
Fig. 3 is three of bridge construction schematic diagram of the present invention.
Fig. 4 is four of bridge construction schematic diagram of the present invention.
Fig. 5 is five of bridge construction schematic diagram of the present invention.
Fig. 6 is six of bridge construction schematic diagram of the present invention.
Fig. 7 is seven of bridge construction schematic diagram of the present invention.
Fig. 8 is eight of bridge construction schematic diagram of the present invention.
Fig. 9 is nine of bridge construction schematic diagram of the present invention.
The specific embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
Embodiment one.
Shown in Fig. 1-7.
A kind of method that reduces disadvantageous temperature effect on main girder structure of bridge, it is realized one of at least in the following manner:
(1) in the waterproof concrete layer on surface, adds the thermal insulation material, have the thermal insulation waterproof concrete layer 7 of mating formation in order to form at bridge main beam structure 1 end face; As shown in Figure 1.
(2) insulating layer 4 that one deck is made up of pressure-resistant material of mating formation between bridge main beam structure 1 and waterproofing course 2 is in order to reduce or block the heat of surperficial concrete pavement layer to the transmission of bridge main beam structure 1; As shown in Figure 2.
(3) in the waterproofing course between bridge main beam structure 1 and concrete pavement layer 3, add the thermal insulation material, so that the water-proof thermal-insulation layer 8 that one of formation can reduce or intercept heat is transmitted between bridge main beam structure and concrete pavement layer; As shown in Figure 3.
(4) in the waterproof concrete leveling layer between asphalt concrete pavement layer 6 and bridge main structure 1, add thermal insulation material formation thermal insulation waterproof concrete leveling layer 9, the interchange of heat between blocking-up and minimizing asphalt concrete pavement layer 6 and the bridge main structure 1; As shown in Figure 4.
(5) between waterproofing course 2 and concrete leveling layer 5, increase shop one deck insulating layer 4, reduce or block heat transmission between surperficial asphalt concrete pavement layer 6 and the concrete leveling layer 5; As shown in Figure 5.
(6) add the thermal insulation material in the waterproofing course, form water-proof thermal-insulation layer 10, to reduce or to block heat transmission between surperficial asphalt concrete pavement layer 6 and the concrete leveling layer 5.As shown in Figure 6.
(7) add the thermal insulation material in the asphalt concrete pavement layer on surface, form thermal insulation asphalt concrete pavement layer 11, to reduce or to block heat transmission between surperficial asphalt concrete pavement layer and the waterproofing course 2.As Fig. 7.
If implement separately in above-mentioned seven kinds of modes, then with the 2nd and the 5th kind of method effect better, mat formation for the bridge of concrete pavement layer for the surface, the 2nd kind and the 1st, 3 kind mixing result of use is better.Mat formation for the bridge of asphalt concrete pavement layer for the surface, then the 5th kind and the 4th, 6,7 kind mode mixed and use effect of heat insulation best, but cost slightly increases.In addition, can adopt 4-7 kind mode to be implemented when main beam structure adopts all steel shelf structure, only need save the concrete leveling layer and get final product this moment.
Embodiment two.
As shown in Figure 2.
A kind of deck installation structure that reduces disadvantageous temperature effect on main girder structure of bridge, comprise waterproofing course 2 and the concrete pavement layer 3 of mating formation successively on concrete-bridge main beam structure 1, between waterproofing course 2 and the bridge main beam structure 1 and between waterproofing course 2 and the concrete pavement layer 3 simultaneously or be provided with insulating layer 4 separately, the thickness of described insulating layer 4 is 1～100mm, and coefficient of thermal conductivity is not more than 0.8W/mk.
During concrete enforcement, in order to improve effect of heat insulation, also can in concrete pavement layer 3 or waterproofing course 2, mix the heat-barrier material of forming insulating layer 4, shown in Fig. 1,3, the amount of mixing can be less than the amount of above-mentioned insulating layer 4 material therefors, can carry out admixture with reference to the amount of all spreading the minimum insulating layer thickness of back formation.
Insulating layer 4 can be made by fibrous thermal insulation material, cellular thermal insulation material or stratiform thermal insulation material; Described fibrous thermal insulation material comprises glass wool, rock mineral wool, aluminium silicate wool and goods thereof, and is one or more combination in the fibrous plate made of raw material with straw, disregard message stationery organic fiber; Described cellular thermal insulation material comprises one or more the combination in expanded perlite, expanded vermiculite, microporous silicate, litaflex, foam glass, gas concrete, foamed plastics, haydite concrete or the foam concrete; Described stratiform thermal insulation material comprises aluminium foil, metal or nonmetal coated glass and is one or more combination in the plated film goods of base material with the fabric.
Embodiment three.
As shown in Figure 5.
A kind of deck installation structure that reduces disadvantageous temperature effect on main girder structure of bridge comprises concrete leveling layer 5, waterproofing course 2 and the asphalt concrete pavement layer 6 of mating formation successively on concrete-bridge main beam structure 1, wherein:
(a) between asphalt concrete pavement layer 6 and waterproofing course 2;
(b) between waterproofing course 2 and concrete leveling layer 5;
(c) between bridge main beam structure 1 and concrete leveling layer 5;
Have at least one to be provided with insulating layer 4 in above-mentioned (a) and (b), (c), the thickness of described insulating layer 4 is 1-100mm, and coefficient of thermal conductivity is not more than 0.8W/mk.
Same as above the same, during concrete enforcement in order to improve effect of heat insulation, also can described asphalt concrete pavement layer 6, have at least one to be mixed with the heat-barrier material of forming insulating layer 4 among waterproofing course 2 and concrete leveling layer 5 threes, shown in Fig. 4,6,7, the amount of mixing can be less than the amount of above-mentioned insulating layer 4 material therefors, can carry out admixture with reference to the amount of all spreading the minimum insulating layer thickness of back formation.
Embodiment four.
As shown in Figure 8.
A kind of deck installation structure that reduces disadvantageous temperature effect on main girder structure of bridge, comprise waterproofing course 2 and the asphalt concrete pavement layer 3 of mating formation successively on steel bridge main beam structure 1, between waterproofing course 2 and bridge steel beam main beam structure 1 and/or be provided with insulating layer 4 between waterproofing course 2 and the asphalt concrete pavement layer 3, the thickness of described insulating layer 4 is 1～100mm, and coefficient of thermal conductivity is not more than 0.8W/mk.
During concrete enforcement, in order to improve effect of heat insulation, also can in asphalt concrete pavement layer 3 or waterproofing course 2, mix 12 (as shown in Figure 9) of heat-barrier material formation water-proof thermal-insulation layer of forming insulating layer 4, the amount of mixing can be less than the amount of above-mentioned insulating layer 4 material therefors, can carry out admixture with reference to the amount of all spreading the minimum insulating layer thickness of back formation.
Insulating layer 4 can be made by fibrous thermal insulation material, cellular thermal insulation material or stratiform thermal insulation material; Described fibrous thermal insulation material comprises glass wool, rock mineral wool, aluminium silicate wool and goods thereof, and is one or more combination in the fibrous plate made of raw material with straw, disregard message stationery organic fiber; Described cellular thermal insulation material comprises one or more the combination in expanded perlite, expanded vermiculite, microporous silicate, litaflex, foam glass, gas concrete, foamed plastics, haydite concrete or the foam concrete; Described stratiform thermal insulation material comprises aluminium foil, metal or nonmetal coated glass and is one or more combination in the plated film goods of base material with the fabric.
Operating principle of the present invention is:
As everyone knows, the basic mode of heat transfer mainly contains heat conduction, convection current and heat radiation.The size of the material capacity of heat transmission is relevant with coefficient of thermal conductivity, and its numerical value is more big, and the capacity of heat transmission is more strong; The size of coefficient of thermal conductivity depends primarily on the The Nomenclature Composition and Structure of Complexes of heat transfer medium, and is also relevant with the size of temperature, humidity, pressure, apparent density, hole and feature, direction of heat flow simultaneously.In the actual diabatic process of material, simple heat conduction, convection current, heat radiation are often uncommon, and generally, the three can exist simultaneously, and can change mutually.
According to the difference of heat-blocking action mechanism, can be divided into isolation-type, reflection-type and radial pattern 3 classes.Wanting thermal insulation in a word, is exactly the transmission of impedance hot-fluid to greatest extent.Therefore, the employed material of isolation layer of the present invention must have less coefficient of thermal conductivity, the coefficient of heat transfer and radiation heat transfer coefficient, material is not absorbed water and the moisture absorption, have performances such as certain mechanical strength and heat resisting temperature, chemical stability, durability, satisfy every mechanical index of bridge construction material.
Therefore, the thermal insulation material that adopts of isolation layer of the present invention is by the chemical group composition: inorganic thermal insulation material, organic thermal insulation materials, composite material three major types are arranged; By the form branch: fibrous, porous (micropore, bubble) shape, shot shape, stratiform etc. are arranged.Treasure the raising of the energy, protection environmental consciousness along with people, adiabatic, environmental friendly material emerges in an endless stream, now Chang Yong novel thermal insulation material has: fibrous thermal insulation material, and for example: it is the fibrous plate that raw material is made that glass wool, rock mineral wool, aluminium silicate wool and goods thereof reach with organic fibers such as straw, disregard message paper; The cellular thermal insulation material, for example: expanded perlite, expanded vermiculite, microporous silicate, litaflex, foam glass, gas concrete, foamed plastics class (polyurethane, polystyrene, polyvinyl chloride, polyethylene, phenolic aldehyde, urea-formaldehyde foamed plastics etc.); The stratiform thermal insulation material, for example: it is the plated film goods of base material that aluminium foil, metal or nonmetal coated glass reach with the fabric.In addition to the above, also have the energy-conserving and environment-protective performance of many thermal insulation materials also to be enhanced gradually, as: composite board, glass, plastics etc.
Bridge floor is mated formation and is adopted ordinary concrete and bituminous concrete mostly.The coefficient of thermal conductivity of portland cement concrete is between 1.5W/mk～3.3W/mk, and the coefficient of thermal conductivity of conventional bituminous concrete is between 0.8W/mk～1.8W/mk.The present invention recommends the heat-barrier material coefficient of thermal conductivity that adopts as follows:
1. lightweight aggregate haydite concrete coefficient of thermal conductivity: (0.2～0.75) W/mk;
2. hard polyurethane foams coefficient of thermal conductivity: 0.022W/mk～0.027W/mk;
3. foam concrete coefficient of thermal conductivity: 0.087W/mk～0.3W/mk;
4. flyash in great mixed amount water-proof thermal insulation material coefficient of thermal conductivity :≤0.103W/mk;
5. cement polystyrene board heat preserving and insulating material coefficient of thermal conductivity: 0.05W/mk～0.09W/mk;
6. gas concrete coefficient of thermal conductivity: 0.09W/mk～0.22W/mk;
7. cement pearl rock product coefficient of thermal conductivity: 0.14W/mk～0.17W/mk;
8. flyash-haydite concrete coefficient of thermal conductivity: about 0.3～0.65W/mk;
9. the thermal insulation coating coefficient of thermal conductivity under the normal temperature: about 0.03～0.04W/mk.
10. compare with conventional bridge deck pavement material, after adding above-mentioned heat-barrier material, the coefficient of thermal conductivity of whole bridge floor will reduce greatly, after one or more layers insulating layer is set in bridge deck pavement, the bridge main beam structure can effectively be intercepted with the exchange heat in the external world, its vertical gradient temperature peak value can reduce 30%-70%, and the construction investment total value can reduce 5%～10%, and direct economic benefit is very remarkable.The present invention that Here it is can reduce the theoretical foundation of bridge main beam structure gradient temperature load, can reduce construction cost and the maintenance cost of bridge on this basis.
Therefore, setting up insulating layer or add simultaneously the thermal insulation material in the pavement material in the bridge pavement process is that creativeness to traditional design theory and job specfication breaks through, its economic implications and benefit are fairly obvious, will produce far-reaching influence to the communication of China.
In addition, both can after making it to have tangible heat-blocking action, modification directly use as bridge deck pavement material by concrete is carried out during concrete enforcement, at this moment, coefficient of thermal conductivity is at λ≤0.8W/mk, strength grade should not be lower than C40, workability should satisfy bridge design, job specfication to concrete every requirement, thickness 〉=5cm.
When adopting other heat-barrier materials as insulating layer, should satisfy following requirement:
1. insulating layer should have favorable durability, should be arranged, tensile strength: 〉=2.5MPa the life-span (about 15 years) that is not less than bridge floor asphalt mixture surfacing or concrete pavement layer service life at least;
2. in ambient conditions-15 ℃～90 ℃ scope, still can satisfy the 1. requirement of bar.Simultaneously, pave after about 150 ℃ of the temperature standing bitumen layer, do not influence its normal function of use and durability.The bituminous concrete that insulating layer is in contact with it or concrete should have blending, adhesion stress between the two is not less than the adhesion stress between asphalt concrete pavement layer (or concrete pavement layer) and the girder, inter-layer shearing strength is at 25 ℃ of time 〉=1.5MPa, at 35 ℃ of time 〉=1.0MPa;
3. insulating layer has good closely connected property at coarse bridge deck, must not accompany air layer after the bonding;
4. the insulating layer construction should be convenient to operation, and workability, drying time, mechanical performance, mechanical index, weatherability etc. all should meet bridge design and job specfication standard, satisfy the normal instructions for use of bridge.
The part that the present invention does not relate to all prior art that maybe can adopt same as the prior art is realized.
Claims (7)
1. method that reduces disadvantageous temperature effect on main girder structure of bridge is characterized in that this method carries out in following wherein a kind of mode:
(1) in the waterproof concrete layer on surface, adds the thermal insulation material, have the thermal insulation waterproof concrete layer of mating formation in order to form at bridge main beam structure end face;
(2) insulating layer that one deck is made up of pressure-resistant material of between bridge main beam structure and waterproofing course, mating formation, so as to reduce or the heat of blocking surperficial concrete pavement layer to the transmission of bridge main beam inside configuration;
(3) in the waterproofing course between bridge main beam structure and concrete pavement layer, add the thermal insulation material, so that the water-proof thermal-insulation layer that one of formation can reduce or intercept heat is transmitted between bridge main beam structure and concrete pavement layer;
(4) in the waterproof concrete leveling layer between asphalt concrete pavement layer and bridge main structure, add thermal insulation material formation thermal insulation waterproof concrete leveling layer, the interchange of heat between blocking-up and minimizing asphalt concrete pavement layer and the bridge main beam structure;
(5) between waterproofing course and concrete leveling layer, increase the shop insulating layer formed by the thermal insulation material of one deck, reduce or block heat transmission between surperficial asphalt concrete pavement layer and the concrete leveling layer;
(6) add the thermal insulation material in the waterproofing course, form the water-proof thermal-insulation layer, to reduce or to block heat transmission between surperficial asphalt concrete pavement layer and the concrete leveling layer;
(7) add the thermal insulation material in the asphalt concrete pavement layer on surface, form the thermal insulation asphalt concrete pavement layer, to reduce or to block heat transmission between surperficial asphalt concrete pavement layer and the waterproofing course.
2. deck installation structure that reduces disadvantageous temperature effect on main girder structure of bridge, it comprises waterproofing course (2) and the concrete pavement layer (3) of mating formation successively on bridge main beam structure (1), it is characterized in that being provided with insulating layer (4) between waterproofing course (2) and the bridge main beam structure (1) and/or between waterproofing course (2) and the concrete pavement layer (3), the thickness of described insulating layer (4) is 1-100mm, and coefficient of thermal conductivity is not more than 0.8W/m.k.
3. deck installation structure according to claim 2 is characterized in that being mixed with in described concrete pavement layer (3) or the waterproofing course (2) heat-barrier material of forming insulating layer (4).
4. according to claim 2 or 3 described deck installation structures, it is characterized in that described insulating layer (4) made by fibrous thermal insulation material, cellular thermal insulation material or stratiform thermal insulation material; Described fibrous thermal insulation material comprises glass wool, rock mineral wool, aluminium silicate wool and goods thereof, and is one or more combination in the fibrous plate made of raw material with straw, disregard message stationery organic fiber; Described cellular thermal insulation material comprises one or more the combination in expanded perlite, expanded vermiculite, microporous silicate, litaflex, foam glass, gas concrete, foamed plastics, haydite concrete or the foam concrete; Described stratiform thermal insulation material comprises aluminium foil, metal or nonmetal coated glass and is one or more combination in the plated film goods of base material with the fabric.
5. deck installation structure that reduces disadvantageous temperature effect on main girder structure of bridge, it comprises the concrete leveling layer (5) of mating formation successively on bridge main beam structure (1), waterproofing course (2) and asphalt concrete pavement layer (6), it is characterized in that (a) is between asphalt concrete pavement layer (6) and waterproofing course (2), (b) between bridge main beam structure (1) and concrete leveling layer (5), having at least one to be provided with insulating layer (4) between waterproofing course door (2) and the concrete leveling layer (5) or (c), the thickness of described insulating layer (4) is 1-100mm, and coefficient of thermal conductivity is not more than 0.8W/m.k.
6. deck installation structure according to claim 5 is characterized in that having at least among described asphalt concrete pavement layer (6), waterproofing course (2) and concrete leveling layer (5) three one and is mixed with the heat-barrier material of forming insulating layer (4).
7. according to claim 5 or 6 described deck installation structures, it is characterized in that described insulating layer made by fibrous thermal insulation material, cellular thermal insulation material or stratiform thermal insulation material; Described fibrous thermal insulation material comprises glass wool, rock mineral wool, aluminium silicate wool and goods thereof, and is one or more combination in the fibrous plate made of raw material with straw, disregard message stationery organic fiber; Described cellular thermal insulation material comprises one or more the combination in expanded perlite, expanded vermiculite, microporous silicate, litaflex, foam glass, gas concrete, foamed plastics, haydite concrete or the foam concrete; Described stratiform thermal insulation material comprises aluminium foil, metal or nonmetal coated glass and is one or more combination in the Plating membrane product of base material with the fabric.
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| CN 200910027029 CN101581071B (en) | 2009-06-08 | 2009-06-08 | Method for reducing disadvantageous temperature effect on main girder structure of bridge and deck pavement structure |
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| CN 200910027029 CN101581071B (en) | 2009-06-08 | 2009-06-08 | Method for reducing disadvantageous temperature effect on main girder structure of bridge and deck pavement structure |
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| CN101581071B true CN101581071B (en) | 2013-07-17 |
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| CN104631316A (en) * | 2015-01-21 | 2015-05-20 | 大连理工大学 | Structure and method for adopting insulating concrete to reduce temperature stress of concrete girder bridge |
| CN105064209B (en) * | 2015-08-25 | 2017-03-15 | 上海市政工程设计研究总院（集团）有限公司 | A kind of deck paving leveling Rotating fields and its leveling method |
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| CN1089677A (en) * | 1993-03-22 | 1994-07-20 | 张新芳 | Have the building of insulating water-proof floor and make new method |
| CN1563588A (en) * | 2004-04-08 | 2005-01-12 | 东南大学 | Structure of felting bridge floor made from steel box girder in large span |
| CN1594742A (en) * | 2004-05-14 | 2005-03-16 | 深圳市海川实业股份有限公司 | Waterproof structure for deck and construction method thereof |
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|---|---|---|---|---|
| CN1089677A (en) * | 1993-03-22 | 1994-07-20 | 张新芳 | Have the building of insulating water-proof floor and make new method |
| CN1563588A (en) * | 2004-04-08 | 2005-01-12 | 东南大学 | Structure of felting bridge floor made from steel box girder in large span |
| CN1594742A (en) * | 2004-05-14 | 2005-03-16 | 深圳市海川实业股份有限公司 | Waterproof structure for deck and construction method thereof |
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