CN209854528U - Toughness steel-concrete combined bridge floor - Google Patents
Toughness steel-concrete combined bridge floor Download PDFInfo
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- CN209854528U CN209854528U CN201920328061.9U CN201920328061U CN209854528U CN 209854528 U CN209854528 U CN 209854528U CN 201920328061 U CN201920328061 U CN 201920328061U CN 209854528 U CN209854528 U CN 209854528U
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Abstract
The utility model discloses a toughness steel reinforced concrete combination bridge floor, include: the steel box girder is used for bearing load, a top plate of the steel box girder forms a support plane of a bridge deck, a plurality of transverse partition plates and a plurality of plate type stiffening ribs are arranged on the opposite side of the support plane, the transverse partition plates are parallel to each other and are perpendicular to the top plate; the plate-type stiffening ribs are of plate-shaped structures, are parallel to each other and are vertical to the transverse partition plate and the top plate; the tough concrete layer comprises a concrete layer and a reinforcing mesh layer embedded in the concrete layer, and the concrete layer is connected with the steel box girder top plate through a stud component which is pre-welded on the top plate; the asphalt concrete wearing layer is paved on the tough concrete layer. The combined bridge deck is a combined structure formed by orthotropic steel bridge deck plates and tough concrete, and bears external load together, so that the rigidity of the steel bridge deck plates can be greatly improved, the stress of the steel bridge deck plates is reduced, and the fatigue resistance of the steel bridge deck plates is improved.
Description
Technical Field
The utility model belongs to the technical field of bridge steel decking, concretely relates to toughness steel reinforced concrete combination bridge floor.
Background
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information constitutes prior art that is already known to a person skilled in the art.
In the 50 s of the 20 th century, Germany after the second war urgently needs to repair bridges damaged in war, and a novel bridge deck structure form, namely an orthotropic steel bridge deck, is adopted for the first time due to the shortage of steel. The deck slab of such a deck structure is supported on a deck support system formed by diaphragms and longitudinal stiffeners (see figure 1). The bridge deck, the longitudinal stiffening aid and the transverse clapboard are mutually vertical and connected together through welding seams to work together. The thickness of the steel bridge deck is not less than 14mm according to the national standard, and in order to improve the rigidity of the steel bridge deck, the steel bridge deck generally adopts U-shaped stiffening ribs. In recent years, when orthotropic steel bridge decks are adopted for steel bridges, the thickness of the steel bridge deck is usually 16-20mm, the thickness of the U-shaped stiffening ribs is 6-10mm, and the height of the U-shaped stiffening ribs is 260-300mm in order to improve the fatigue performance of the bridge deck structure. However, engineering practice in nearly 70 years shows that fatigue cracking of steel bridge decks (the steel bridge decks at the position of a heavy vehicle lane are cracked earlier due to existing diseases) and cracking, rutting, hugging, pushing and other diseases of pavement layers easily occur after the steel bridge decks and pavement structures in conventional types at home and abroad are used for a period of time (domestic bridges generally have 3-8 years because of more overloaded vehicles, and foreign vehicles have relatively less overload and generally have 15-25 years), and the steel bridge decks and the pavement structures have to be maintained frequently in an operation cycle, so that the maintenance cost is extremely high, and traffic interruption causes huge social cost. Utility model people discover, the fragile reason of orthotropic steel bridge deck pavement layer mainly includes that the rigidity of steel decking is not enough, and the high temperature performance, fatigue property and the bonding strength on pitch pavement layer are not good, reasons such as bridge overload operation. The solution can be to increase the thickness of the steel bridge deck (the thickness of the steel bridge deck is not less than 14mm specified by national regulations), improve construction details, improve a processing technology and the like, but the methods can not thoroughly solve the problem of diseases of orthotropic steel bridge decks.
At present, epoxy asphalt concrete or pouring asphalt concrete with the thickness of 5cm-8cm is generally adopted for paving a conventional steel bridge deck, the manufacturing cost is 1000-1500 Yuan/sq.m, the service life is 15 years, the bridge needs to be replaced for 6 times in the service life, the prior art has high requirements on the construction process, the temperature of a mixture is required to be more than 100 ℃ during construction, the pollution to the environment is high, and traffic needs to be sealed.
The ultra-high performance composite steel deck structure which has started to be applied in recent years is a new steel deck structure. The structure is that high-strength active powder concrete is paved on a steel bridge deck slab, the strength of the concrete structure can reach more than 120MPa, which is 3-5 times of that of a conventional concrete material, so the concrete structure is brittle, high-quality steel fibers with the volume content of not less than 3 percent need to be doped, dense reinforcement is adopted to improve the ductility of the structure, the distance between reinforcing steel bars is about 4cm generally, and the diameter of the reinforcing steel bars is 10mm generally. In addition, because the concrete adopts the fine aggregate with the diameter less than 1.25mm, the dry shrinkage strain of the concrete is larger and is 2-3 times of that of the conventional concrete, a high-temperature steam curing method is required during construction, the requirement on construction equipment is higher, and the construction is generally finished by professional manufacturers. At present, the cost of the steel-concrete composite bridge deck structure is higher, and the unit price is about 1600 plus 1800 Yuan/sq m.
SUMMERY OF THE UTILITY MODEL
To the technical problem who exists among the above-mentioned prior art, the utility model aims at providing a toughness steel reinforced concrete combination bridge floor, this kind of combination bridge floor is that the integrated configuration that orthotropic steel decking and tough concrete formed undertakes external load jointly, can improve the rigidity of steel decking greatly, reduce the atress of steel decking self, improve the fatigue resistance ability of steel decking, after steel decking and tough concrete formed the integrated configuration, its rigidity will be greater than the steel sheet far away, steel decking then only need adopt more simple board-like stiffening rib can, the processing of steel construction will be more convenient. In addition, the conventional asphalt wearing layer is paved on the upper surface of the cement-based tough concrete, so that the stability of the conventional asphalt wearing layer is better, the later maintenance is consistent with the conventional concrete bridge deck pavement, the maintenance is more convenient and faster in the service life of the bridge, and the cost is lower.
In order to solve the above problems, the technical scheme of the utility model is that:
a ductile steel-concrete composite bridge deck comprising:
the steel box girder is used for bearing load, a top plate of the steel box girder forms a support plane of a bridge deck, a plurality of transverse partition plates and a plurality of plate type stiffening ribs are arranged on the opposite side of the support plane, the transverse partition plates are parallel to each other and are perpendicular to the top plate; the plate-type stiffening ribs are of plate-shaped structures, are parallel to each other and are vertical to the transverse partition plate and the top plate;
the tough concrete layer comprises a concrete layer and a reinforcing mesh layer embedded in the concrete layer, and the concrete layer is connected with the steel box girder top plate through a stud component which is pre-welded on the top plate;
the asphalt concrete wearing layer is paved on the tough concrete layer.
The diaphragm plate and the board-like stiffening rib of roof bottom of steel box girder are mutually perpendicular, are netted the distribution, can play good supporting role to the roof of steel box girder, and then play good supporting role to the combination bridge floor to guarantee the stability of combination bridge floor. The plate-type stiffening ribs increase the rigidity of the steel bridge deck before the steel bridge deck and the tough concrete layer form a combined structure, and the plate-type stiffening ribs and the steel bridge deck form an orthotropic steel bridge deck to bear the load of the tough concrete.
1) The tough concrete layer is connected with the steel box girder top plate through the pre-welded stud, so that the connection strength between the tough concrete layer and the steel box girder top plate can be obviously enhanced. The combined structure formed by the tough concrete layer and the steel box girder top plate bears external load together, so that the rigidity of the bridge deck can be greatly improved, and the fatigue stress of key parts of the steel bridge deck can be greatly reduced, thereby solving the problem of fatigue cracking of the steel bridge deck before the service life is reached; 2) because of the steel and concrete composite structure rigidity improves greatly, steel bridge deck plate thickness can reduce, and steel bridge deck plate also need not to adopt U type stiffening rib, adopt board-like stiffening rib can, the steel construction processing is more convenient. 3) The reinforcing mesh reinforces the concrete layer, so that the concrete layer has better toughness, and compared with a high-strength concrete composite structure, the reinforcing mesh has better ductility, is favorable for reducing the construction cost, and simplifies the reinforcing bar processing technology. 4) Compare with epoxy asphalt or pouring type asphalt concrete bridge deck pavement scheme, when the bridge deck pavement overhaul, the utility model discloses only need to change asphalt concrete wearing and tearing layer, need not to seal the traffic during the construction, divide the lane change can, be showing the regional social effect that traffic pressure is big.
The asphalt concrete wearing layer can transfer and diffuse wheel load, increase the friction force between the wheel and a pavement structure layer, reduce driving noise, improve driving comfort and protect the tough concrete layer from direct action of the wheel.
A construction method of a tough steel-concrete combined bridge deck comprises the following steps:
processing, welding, anticorrosive coating and welding a stud component on the surface of a steel box girder top plate;
conveying the steel structure to the site, hoisting the steel structure in place, and completing the connection between the sections;
sand blasting and rust removing are carried out on the bridge deck in the area with the distance from the outer edge of the tough concrete layer to the inside, and anti-rust paint is coated;
binding a reinforcing mesh, pouring tough concrete, and laying a health preserving film for moisturizing and maintaining after pouring is finished;
and after the maintenance is finished, performing shot blasting roughening treatment on the surface of the tough concrete layer, and constructing an asphalt wearing layer to obtain the combined bridge deck.
The tough concrete is a cement-based material, which is mainly composed of cement, cement and filler or fine aggregate with the grain size not greater than 5mm, and is reinforced by using a non-metal fiber woven mesh with the fiber mixing amount not greater than 2.5% of the total volume of the composite material, the hardened composite material has obvious strain hardening characteristics, a plurality of fine cracks can be generated under the action of tensile load, the width of the ultimate crack is less than 0.05mm, and the ultimate tensile strain can stably reach more than 3%. The ultimate tensile strain of the material is more than 300 times of the tensile strain (0.01%) of concrete, and the yield strain (0.15%) of reinforcing steel bars is more than 20 times. The composite material is superposed with orthotropic steel bridge deck slab to form a toughness combined structure, so that the stress performance of the steel bridge deck slab can be obviously improved, and the service performance of the composite material can be greatly improved by arranging the asphalt wearing layer on the tough concrete.
The tough concrete generally has good drainage performance, and can be considered to be impervious when in use, namely, the joint part of the tough concrete and a steel bridge deck cannot be corroded by a steel plate, but the edge part of the tough concrete slightly slides under the influence of construction and temperature, so that in order to improve the durability of the steel bridge deck, the bridge deck in the area with the outer edge of the tough concrete layer inwards at a certain distance needs to be subjected to sand blasting rust removal and anticorrosive coating.
The health preserving film is a waterproof film and is used for moisturizing the concrete in the curing process so as to ensure the curing effect of the tough concrete.
The shot blasting roughening treatment is carried out on the surface of the tough concrete layer, so that the bonding effect of the tough concrete layer and the surface asphalt wearing layer can be enhanced, and the construction quality of the surface asphalt wearing layer is improved.
The utility model discloses beneficial effect does:
the diaphragm plate and the board-like stiffening rib of roof bottom of steel box girder are mutually perpendicular, are netted the distribution, can play good supporting role to the roof of steel box girder, and then play good supporting role to the combination bridge floor to guarantee the stability of combination bridge floor. The plate-type stiffening ribs increase the rigidity of the steel bridge deck before the steel bridge deck and the tough concrete layer form a combined structure, and the plate-type stiffening ribs and the steel bridge deck form an orthotropic steel bridge deck to bear the load of the tough concrete.
1) The tough concrete layer is connected with the steel box girder top plate through the pre-welded stud, so that the connection strength between the tough concrete layer and the steel box girder top plate can be obviously enhanced. The combined structure formed by the tough concrete layer and the steel box girder top plate bears external load together, so that the rigidity of the bridge deck can be greatly improved, and the fatigue stress of key parts of the steel bridge deck can be greatly reduced, thereby solving the problem of fatigue cracking of the steel bridge deck before the service life is reached; 2) because of the steel and concrete composite structure rigidity improves greatly, steel bridge deck plate thickness can reduce, and steel bridge deck plate also need not to adopt U type stiffening rib, adopt board-like stiffening rib can, the steel construction processing is more convenient. 3) The reinforcing mesh reinforces the concrete layer, so that the concrete layer has better toughness, and compared with a high-strength concrete combined structure, the concrete layer has better ductility, is favorable for reducing the construction cost, and simplifies the reinforcing steel bar processing technology. 4) Compare with epoxy asphalt or pouring type asphalt concrete bridge deck pavement scheme, when the bridge deck pavement overhaul, the utility model discloses only need to change asphalt concrete wearing and tearing layer, need not to seal the traffic during the construction, divide the lane change can, be showing the regional social effect that traffic pressure is big.
The asphalt concrete wearing layer can transfer and diffuse wheel load, increase the friction force between the wheel and a pavement structure layer, reduce driving noise, improve driving comfort and protect the tough concrete layer from direct action of the wheel.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
FIG. 1 is a schematic structural view of an orthotropic steel deck;
FIG. 2 is a standard cross-sectional view of a bridge;
FIG. 3 is a cross-sectional view of a deck with a tough steel-concrete composite structure;
FIG. 4 is a longitudinal section view of a bridge deck with a tough steel-concrete composite structure;
FIG. 5 is a plan view of an anti-rust paint brushing area of a steel bridge deck;
fig. 6 is a schematic structural view of a stud head pin.
In the figure: 1. bridge floor, 2, steel box girder, 3, asphalt concrete wearing layer, 4, toughness concrete layer, 5, steel box girder roof, 6, horizontal reinforcing steel bar, 7, stud, 8, longitudinal reinforcing steel bar, 9, plate-type stiffening rib, 10, steel box girder diaphragm.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1 and 2, a tough steel-concrete composite bridge deck comprises:
the steel box girder is used for bearing load, a top plate of the steel box girder forms a support plane of a bridge deck, a plurality of transverse partition plates and a plurality of plate type stiffening ribs are arranged on the opposite side of the support plane, the transverse partition plates are parallel to each other and are perpendicular to the top plate; the plate-type stiffening ribs are of plate-shaped structures, are parallel to each other and are vertical to the transverse partition plate and the top plate;
the tough concrete layer comprises a concrete layer and a reinforcing mesh layer embedded in the concrete layer, and the concrete layer is connected with the steel box girder top plate through a stud component which is pre-welded on the top plate;
the asphalt concrete wearing layer is paved on the tough concrete layer.
The diaphragm plate and the board-like stiffening rib of roof bottom of steel box girder are mutually perpendicular, are netted the distribution, can play good supporting role to the roof of steel box girder, and then play good supporting role to the combination bridge floor to guarantee the stability of combination bridge floor. The plate-type stiffening ribs increase the rigidity of the steel bridge deck before the steel bridge deck and the tough concrete layer form a combined structure, and the plate-type stiffening ribs and the steel bridge deck form an orthotropic steel bridge deck to bear the load of the tough concrete.
The tough concrete layer is connected with the steel box girder top plate through the pre-welded stud, so that the connection strength between the tough concrete layer and the steel box girder top plate can be obviously enhanced. The combined structure of the tough concrete layer and the steel box girder top plate bears external load together, so that the rigidity of the bridge deck can be greatly improved, and the fatigue stress of key parts of the steel bridge deck can be greatly reduced, thereby solving the problem of fatigue cracking of the steel bridge deck before the service life is reached; 2) because of the steel and concrete composite structure rigidity improves greatly, steel bridge deck plate thickness can reduce, and steel bridge deck plate also need not to adopt U type stiffening rib, adopt board-like stiffening rib can, the steel construction processing is more convenient. 3) The reinforcing mesh reinforces the concrete layer, so that the concrete layer has better toughness, and compared with a high-strength concrete combined structure, the concrete layer has better ductility, is favorable for reducing the construction cost, and simplifies the reinforcing steel bar processing technology.
The asphalt concrete wearing layer can transfer and diffuse wheel load, increase the friction force between the wheel and a pavement structure layer, reduce driving noise and protect the tough concrete layer from the direct action of the wheel.
In some embodiments, the top plate of the steel box girder has a thickness of 10-12 mm. The roof of steel box girder is the component part of top surface on the bridge cross-section, participates in the atress jointly after forming integrated configuration with toughness concrete, template when also being cast-in-place toughness concrete, and when this roof had sufficient thickness, can provide sufficient holding power, should be not less than 14 mm's standard with national standard regulation steel bridge deck plate thickness and compare, the utility model discloses in the thickness requirement of the roof plate to steel box girder be 10-12mm, can save the cost.
In some embodiments, the thickness of the tough concrete layer is 5-8 cm. The tough concrete layer improves the rigidity of the steel bridge deck, and forms a combined structure with the steel bridge deck to jointly participate in stress to transfer second-stage dead load, wheel load and the like.
In some embodiments, the reinforcing mesh is composed of a plurality of transverse reinforcing steel bars arranged side by side and a plurality of longitudinal reinforcing steel bars arranged side by side, the diameters of the transverse reinforcing steel bars and the longitudinal reinforcing steel bars are 8-12mm, and the distance between two adjacent transverse reinforcing steel bars or two adjacent longitudinal reinforcing steel bars is 120-130 mm. The reinforcing mesh consisting of the transverse reinforcing steel bars and the longitudinal reinforcing steel bars can further increase the toughness and the tensile strength of the concrete structure.
The transverse steel bars are steel bars parallel to the width direction of the bridge deck, and the longitudinal steel bars are steel bars parallel to the length direction of the bridge deck.
Further, the transverse steel bars and the longitudinal steel bars are HRB 400-grade steel bars.
Further, the transverse reinforcing steel bars are positioned above the longitudinal reinforcing steel bars. The formed combined bridge deck structure is stressed in the transverse bridge direction, and transverse reinforcing steel bars are arranged above the combined bridge deck structure and are more beneficial to stress.
Furthermore, the net protective layer thickness of all transverse steel bars and all longitudinal steel bars is 10-20 mm. The net protective layer is the distance from the outer edge of the steel bar to the concrete surface and is used to protect the steel bar from air and water, or the corrosion rate is acceptable in the service life.
In some embodiments, the peg assembly comprises a plurality of pegs, the plurality of pegs being evenly distributed on the top plate.
Further, the distance between adjacent pegs is 100 and 200 mm.
Further, the diameter of the pin isThe stud is vertically welded on the top plate of the steel box girder, and the height of the stud is 5-10mm smaller than the thickness of the tough concrete layer. The purpose of the studs is to connect the steel plates to the tough concrete layer, acting as a shear and lift resistance, and therefore must be lower in height than the thickness of the concrete layer, but not too short, and given that the tough concrete layer is thin, the height of the studs is specified to be 5-10mm less than the thickness of the tough concrete layer.
In some embodiments, the asphalt concrete wearing course has a thickness of 3-5 cm. The load of the wheels is transferred and diffused, the friction force between the wheels and a road surface structure layer is increased, the driving noise is reduced, and the tough concrete layer is protected from the direct action of the wheels.
In some embodiments, the plate-shaped stiffening rib comprises a plate body, a first reinforcing body and a second reinforcing body, wherein the first reinforcing body is connected to a position where the plate body is jointed with the steel box girder top plate, and the second reinforcing body is connected between one end of the plate body, which is far away from the steel box girder top plate, and the steel box girder top plate.
The first reinforcing body and the second reinforcing body can respectively reinforce the root of the plate body and one end far away from the steel box girder top plate so as to improve the reinforcing effect of the plate-shaped stiffening rib.
Furthermore, the first reinforcing body is in a quarter-cylinder shape, and two mutually vertical surfaces of the first reinforcing body are respectively welded with the plate body and the steel box girder top plate.
The tough steel-concrete combined bridge deck structure has the following characteristics: 1) the rigidity of the bridge deck is greatly improved, and the fatigue stress of key parts of the steel bridge deck is greatly reduced, so that the problem of fatigue cracking of the steel bridge deck when the service life is not reached is solved; 2) because the rigidity of the steel-concrete composite structure is greatly improved, the steel bridge deck does not need to adopt U-shaped stiffening ribs, only plate-type stiffening ribs are adopted, and the steel structure is more convenient to process; 3) the high-toughness concrete has ductility comparable to that of steel, and has good ductility only by conventional reinforcement after forming a combined structure with a steel bridge deck, so that the engineering cost is reduced, and the processing technology of the reinforcement is simplified; 4) the high-toughness concrete has the characteristic of harmless and dispersive cracks, the requirement of controllable concrete cracks can be realized without high-temperature steam curing, the construction process is greatly simplified, and the engineering application is more convenient and faster; 5) the construction of the wearing layer is the same as that of the conventional asphalt concrete, high-temperature construction is not needed, and the environmental pollution is small; 6) the price of the structural concrete material is obviously lower than that of active powder concrete, the price of the wearing layer is 800-1000 yuan/square meter, and the construction cost of the bridge in the service life can be greatly reduced only by replacing the asphalt wearing layer in the service life of the bridge compared with the scheme of epoxy asphalt or pouring asphalt concrete.
A construction method of a tough steel-concrete combined bridge deck comprises the following steps:
processing, welding, anticorrosive coating and welding a stud component on the surface of a steel box girder top plate;
conveying the steel structure to the site, hoisting the steel structure in place, and completing the connection between the sections;
sand blasting and rust removing are carried out on the bridge deck in the area with the inward distance from the edge of the tough concrete layer, and antirust paint is coated;
binding a reinforcing mesh, pouring tough concrete, and laying a health preserving film for moisturizing and maintaining after pouring is finished;
and after the maintenance is finished, performing shot blasting roughening treatment on the surface of the tough concrete layer, and constructing an asphalt wearing layer to obtain the combined bridge deck.
In some embodiments, the tough concrete comprises a non-metallic fiber woven mesh and a cement-based matrix, wherein the cement-based matrix is doped with non-metallic short fibers, and the cement-based matrix comprises the following components in percentage by mass: 9-31% of water, 5-60% of cement, 5-70% of active mineral fine admixture, 20-40% of fine sand and 0-2% of water reducing agent.
The active mineral fine admixture is at least one of materials with volcanic ash activity, such as fly ash, silica fume, granulated blast furnace slag and the like, and the particle size of the fine sand is less than 0.6 mm.
The non-metal fiber woven mesh comprises a carbon fiber woven mesh, an aramid fiber woven mesh, an alkali-resistant glass fiber woven mesh, a polyvinyl alcohol fiber woven mesh, a polyethylene fiber woven mesh or a hybrid fiber woven mesh formed by mixing and weaving the above fibers.
The non-metal short fiber is one or more of polyvinyl alcohol fiber, polyethylene fiber, carbon fiber and aramid fiber.
In some embodiments, the tough concrete has a pour temperature greater than 10 ℃ and a discharge temperature greater than 26 ℃. Mainly in order to guarantee the casting quality of the tough concrete, the temperature is too low to be beneficial to the maintenance of the concrete.
In some embodiments, the bridge deck of the steel box girder motor vehicle lane is not subjected to sand blasting for rust removal, after the steel bridge deck is cleaned, antirust paint is coated on the periphery of the steel bridge deck, then steel mesh construction is carried out, and the bridge deck is thoroughly cleaned before the tough concrete layer is poured.
In some embodiments, the set distance is 45-55 cm.
Furthermore, the cleanliness after sand blasting and rust removal is Sa2.5 grade, and the roughness reaches Rz 50-80 μm.
Furthermore, the antirust paint is epoxy zinc-rich antirust paint, the thickness of the coated antirust paint is 80 micrometers, and the interface drawing strength is not lower than 5 MPa. The thickness of the rust inhibitive paint is a specified value of national regulations, and the connection performance is not good if the interface strength is too low.
In some embodiments, after the pouring of the tough concrete is completed, the moisture preservation and maintenance are carried out by adopting the health preserving film, and the time is not less than 5 days; in the maintenance process, the vibration of the bridge deck is strictly controlled, the maintenance of the position near the construction block is not suitable for construction, and the construction vehicles need to pass at a low speed and a constant speed.
In some embodiments, the temperature of the asphalt wearing course is not lower than 5 ℃.
The concrete case is as follows:
a construction method of a tough steel-concrete combined bridge deck comprises the following steps:
processing, welding, anticorrosive coating and welding a stud component on the surface of a steel box girder top plate;
conveying the steel structure to the site, hoisting the steel structure in place, and completing the connection between the sections;
carrying out sand blasting on a bridge deck plate in a 50cm inward area of the edge of a tough concrete layer to remove rust, wherein the cleanliness after sand blasting and rust removing is Sa2.5 grade, the roughness reaches Rz 50-80 mu m, then coating epoxy zinc-rich antirust paint, the thickness of the antirust paint is 80 mu m, and the interface drawing strength is 5 MPa;
binding a reinforcing mesh, pouring tough concrete, wherein the pouring temperature of the tough concrete is 12 ℃, the discharging temperature is 28 ℃, the thickness of the tough concrete is 7cm, after pouring is finished, laying a health preserving film for moisturizing and curing, wherein in the curing process, the curing time is 5 days, the vibration of the bridge deck is strictly controlled, the construction near a curing construction block is not suitable, and a construction vehicle is required to pass at a slow speed and a uniform speed;
and after the maintenance is finished, performing shot blasting roughening treatment on the surface of the tough concrete layer, and constructing an asphalt wearing layer, wherein the thickness of the asphalt wearing layer is 4cm, so as to obtain the combined bridge deck.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a toughness steel reinforced concrete combination bridge floor which characterized in that: the method comprises the following steps:
the steel box girder is used for bearing load, a top plate of the steel box girder forms a support plane of a bridge deck, a plurality of transverse partition plates and a plurality of plate type stiffening ribs are arranged on the opposite side of the support plane, the transverse partition plates are parallel to each other and are perpendicular to the top plate; the plate-type stiffening ribs are of plate-shaped structures, are parallel to each other and are vertical to the transverse partition plate and the top plate;
the tough concrete layer comprises a concrete layer and a reinforcing mesh layer embedded in the concrete layer, and the concrete layer is connected with the steel box girder top plate through a stud component which is pre-welded on the top plate;
the asphalt concrete wearing layer is paved on the tough concrete layer.
2. The ductile steel-concrete composite bridge deck according to claim 1, wherein: the thickness of the top plate of the steel box girder is 10-12 mm; the thickness of the tough concrete layer is 5-8 cm; the thickness of the asphalt concrete wearing layer is 3-5 cm.
3. The ductile steel-concrete composite bridge deck according to claim 1, wherein: the reinforcing mesh consists of a plurality of transverse reinforcing steel bars arranged side by side and a plurality of longitudinal reinforcing steel bars arranged side by side, the diameters of the transverse reinforcing steel bars and the longitudinal reinforcing steel bars are 8-12mm, and the distance between two adjacent transverse reinforcing steel bars or two adjacent longitudinal reinforcing steel bars is 120-130 mm.
4. The ductile steel-concrete composite bridge deck according to claim 3, wherein: the transverse steel bars are positioned above the longitudinal steel bars, and the net protective layer thickness of all the transverse steel bars and all the longitudinal steel bars is 10-20 mm.
5. The ductile steel-concrete composite bridge deck according to claim 1, wherein: the peg has a diameter ofThe stud is vertically welded on the top plate of the steel box girder, and the height of the stud is 5-10mm smaller than the thickness of the tough concrete layer.
6. The ductile steel-concrete composite bridge deck according to claim 1, wherein: the plate type stiffening rib comprises a plate body, a first reinforcing body and a second reinforcing body, wherein the first reinforcing body is connected to the position where the plate body is connected with the steel box girder top plate, and the second reinforcing body is connected between one end, far away from the steel box girder top plate, of the plate body and the steel box girder top plate.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109778665A (en) * | 2019-03-14 | 2019-05-21 | 山东省交通规划设计院 | A kind of toughness steel reinforced concrete combined bridge deck and its construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109778665A (en) * | 2019-03-14 | 2019-05-21 | 山东省交通规划设计院 | A kind of toughness steel reinforced concrete combined bridge deck and its construction method |
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