CN115125840A - Construction method of modified high-strength concrete corrugated roof combined bridge deck - Google Patents

Abstract

The invention relates to a construction method of a modified high-strength concrete corrugated roof composite bridge deck, which includes the following process steps: S1, laying profiled steel plates, the current bridge deck, the web lining on both sides of the middle fulcrum, and the end beam support After the concrete curing is completed, firstly lay open profiled steel plates between the cantilevers and boxes of the steel box girder, and then install plug plates at the ends of the open profiled steel plates; S2, install steel bars, anchor pads and pre- Stress tunnel; S3, pouring the modified high-strength concrete, pouring the modified high-strength concrete after the installation of the side formwork; S4, curing the concrete, after the concrete pouring is completed, pass the steam at 45-55 ℃ through the steam pipe for curing for 6-12 hours, and the air pressure Controlled at 1.0 ~ 1.2Mpa. The corrugated roof and the concrete structure layer of the invention are reliable in connection, reduce the fatigue cracking possibility of the steel bridge deck, and obviously improve the construction quality of the bridge deck.

Description

A kind of construction method of modified high-strength concrete corrugated roof composite bridge deck

technical field

The invention relates to the field of bridge deck structure construction, in particular to a construction method of a modified high-strength concrete corrugated roof composite bridge deck.

Background technique

Steel bridge decks have the advantages of light weight, high bearing capacity, easy manufacture, and convenient construction, and are widely used in large and medium-span bridge projects. Significant difference in thinness

The wall plate structure, under the action of the reciprocating wheel load, part of the welded structure details are subjected to high stress amplitude due to stress concentration, and the inevitable initial welding defects, welding residual stress and manufacturing and processing errors and other unfavorable factors further aggravate the occurrence of steel bridge decks. The risk of fatigue cracking has become a key technical problem restricting the sustainable development of steel structure bridges.

In the prior art, the local deformation of the steel bridge deck under the action of wheel load is relatively large, and both the paving layer and the bonding layer have high local stress. Under the coupling action, the steel bridge deck pavement is prone to cracking, rutting, delamination and wrapping, which not only significantly reduces the service quality of the bridge structure, greatly increases the operation and maintenance costs, but also further aggravates the occurrence of steel bridge decks. Risk of fatigue cracking.

Therefore, it is urgent to develop and design a corrugated roof composite bridge deck structure and construction method to solve the two major problems of fatigue cracking of steel bridge deck and vulnerable deck pavement, and further improve the construction quality of composite bridge deck structure.

SUMMARY OF THE INVENTION

In view of the problems existing in the prior art, the purpose of the present invention is to provide a corrugated roof deck combined bridge deck structure and construction method, the connection between the corrugated roof and the concrete structure layer is reliable, the possibility of fatigue cracking of the steel bridge deck is reduced, and the bridge deck is obviously improved. Construction quality of the panels.

Above-mentioned purpose of the present invention is achieved through the following technical solutions:

A construction method of a modified high-strength concrete corrugated roof composite bridge deck, comprising the following process steps:

S1, laying profiled steel plates. After the current bridge deck, the web lining on both sides of the mid-fulcrum and the concrete curing at the end beam supports are completed, firstly lay open profiled steel plates between the cantilevers and boxes of the steel box girder. Then install the plug plate at the end of the open profiled steel plate;

S2, install steel bars, anchor plates and prestressed tunnels, which are divided into operation steps:

(1) First pop out the edge of the steel bar frame around the open profiled steel plate, and use the steel bar positioning frame to control the spacing of the steel bars, and then install and bind the steel bars in the open profiled steel plate;

(2) During the installation of the reinforced skeleton sheet, install the anchor plate according to the predetermined position to ensure the installation position requirements of the anchor plate;

(3) Corrugated pipes are used for the prestressed tunnel, the top plate of the embedded anchor ring installed on the anchoring end should be perpendicular to the center line of the prestressed tunnel, and grouting holes and exhaust holes are set on the prestressed tunnel;

S3, pouring the modified high-strength concrete. After the side formwork is installed, pour the bridge deck, end beam, pier top continuous and both sides of the middle fulcrum. The three-roller concrete paver is placed at a speed of 30-40m/h. For construction, spray water to wet the surface of the box girder before fabricating;

S4, curing the concrete. After the concrete is poured, the steam at 45-55°C is introduced through the steam pipe for curing for 6-12 hours, and the air pressure is controlled at 1.0-1.2Mpa until the bridge deck, end beam, pier top continuous and middle pivot point. The concrete curing on the side reaches the design standard.

Further, the modified high-strength concrete is made of the following components in parts by weight: 35-45 parts of cement, 8-10 parts of fine sand, 20-25 parts of crushed stone, 50-60 parts of water, and 5.5 parts of modified asphalt ~7.5 parts, 8-10 parts of metakaolin, 3-5 parts of fly ash, 0.6-0.8 part of leveling agent.

Further, the modified asphalt is made by fully mixing the following components by weight: 60-80 parts of base asphalt, 10-15 parts of red mud, 5-7 parts of rubber powder, and 2.5-5.5 parts of SBS modifier , 5 to 7 parts of slaked lime, 8 to 10 parts of white mud, and 0.3 to 1.6 parts of silicate materials.

Further, one end of the prestressed channel is the grouting end, the grouting end is connected with the grouting pump, the other end of the prestressed channel is the suction end, and the suction end is branched with a waste slurry container and a slurry storage bucket. , the slurry barrel is also connected with a vacuum pump.

Further, vacuumize the prestressed channel until the vacuum pressure reaches the range of -0.06～-0.1Mpa, and then press the slurry into the prestressed channel through a grouting pump, and the grouting pressure is controlled at 0.5～0.7 Mpa.

Further, the top of the steel box beam is covered with a corrugated top plate, and the grooves of the corrugated top plate are positioned and matched with the steel bars.

Further, the length of the three rollers of the three-roller concrete paver is 3.5m, the diameter is 219mm, and the height of the material is 2cm higher than the track.

Further, each vertex position of the bellows is provided with an exhaust hole, each low point position is provided with a drainage hole, each vertex and both ends are provided with inspection holes, exhaust holes and drainage holes. Correspondingly, an exhaust pipe and a drain pipe are connected.

Further, the steam pipeline is connected with an electric heating steam generator, the electric heating steam generator includes a water supply system, an automatic control system, a heating system and a safety protection system, and the steam generated by the electric heating steam generator is input to the bridge deck through the steam pipeline concrete.

Further, after the high-strength concrete is poured, the standing time is 4 to 6 hours, and the ambient temperature is not lower than 10°C; after the high-strength concrete reaches the initial strength, steam is introduced to heat up the concrete. Not more than 8℃/h.

Compared with the prior art, the present invention at least includes the following beneficial technical effects:

1. The construction method of the present invention adopts the modified high-strength concrete material of high elastic modulus and high tensile and compressive strength as the bridge deck structure layer, and realizes that after the concrete pouring is completed, the component distribution ratio of the concrete and the doped modified asphalt are improved. For the purpose of no steam curing, the use of the modified concrete can greatly reduce the thickness and self-weight of the structural layer, and improve the durability of the composite bridge deck. The invention adopts the same method as the corrugated web to roll the corrugated top plate, and replaces the U-rib welding of the top plate, greatly reduces the number of welding seams, realizes mechanized welding of all welding seams, improves the manufacturing efficiency and controls the welding quality. The invention optimizes the original PBL shear connector, and adopts the shear connector with free openings at both ends as the reinforcement arrangement and limit structure structure. performance, which can effectively improve the service life of the bridge.

2. The specific steps of the construction method of the present invention are divided into: the step of laying profiled steel plates, the step of installing steel bars, anchor plates and prestressed tunnels, the step of pouring modified high-strength concrete, and the step of curing concrete. The fine stone concrete of the beam, the continuous part of the top of the pier, the concrete on both sides of the middle fulcrum, and the concrete of the bridge deck are poured in two steps. After the concrete is poured, steam curing is carried out in time to ensure the construction quality of the bridge deck. Pre-camber detection should be carried out at any time during the concrete pouring process. If the pre-camber changes too much, measures should be taken to adjust it in time to ensure the construction quality of the steel box girder.

3. When the vacuum-assisted grouting process is used in the present invention to perform grouting, all prestressed ducts are provided with exhaust holes at each vertex, drainage holes at each low point, and inspection holes at each vertex and both ends. When the vacuum pressure in the prestressed channel reaches and stabilizes in the range of -0.06～-0.1MPa, the slurry is pressed into the prestressed channel at low speed and slow speed, and the grouting pressure is controlled at 0.5～0.7MPa, so that the gas in the channel can be monitored in real time. To ensure that the tightness and connection strength of the connection between the bellows and each pipeline meet the requirements.

4. After the construction of the modified high-strength concrete of the present invention is completed, cover it with a geotextile and sprinkle an appropriate amount of warm water for curing, and arrange a steam pipeline on the surface of the concrete to ensure that the curing temperature of the concrete meets the requirements, and effectively avoid the influence of high-temperature steam on the coating. , In the curing process of concrete, an overall scaffold is used for thermal insulation, and the outer side is wrapped with thermal insulation tarpaulin. The curing temperature and humidity are recorded during curing, and the strength of concrete and elastic mold on the third, fourth and fifth days is tested to determine the curing cycle. So as to ensure the quality of concrete curing.

Description of drawings

Fig. 1 is the process flow schematic diagram of the present invention.

FIG. 2 is a schematic structural diagram of the bridge deck of the present invention.

Fig. 3 is a schematic diagram of the arrangement of the open profiled steel plate of the present invention.

Fig. 4 is a schematic diagram of concrete pouring of the bridge deck of the present invention.

Fig. 5 is a schematic diagram of the vacuum-assisted grouting of the present invention.

Reference symbols in the figure: 1. Steel box girder; 2. Cantilever; 3. Open profiled steel plate; 4. Concrete at the end beam support; 5. Grouting pump; 6. Exhaust valve; 7. Prestressed tunnel ;8, slurry tank; 9, vacuum pump; 10, waste slurry container; 11, grouting end; 12, suction end; 13, bridge deck; 13-a, pre-cast concrete for bridge deck; 13-b, bridge Panel post poured concrete.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings.

1 and 2, the present embodiment discloses a construction method of a modified high-strength concrete corrugated roof composite bridge deck, which includes the following process steps:

S1, laying profiled steel plates, referring to Figure 3, after the current bridge deck 13, the web linings on both sides of the middle fulcrum and the concrete 4 at the end beam supports are cured, first install the cantilever 2 of the steel box girder 1, between the boxes Lay the open profiled steel plates 3 respectively, and then install the plug plates at the ends of the open profiled steel plates 3. The beam top of the steel box girder 1 is laid with a corrugated top plate, and the grooves of the corrugated top plate are positioned and matched with the steel bars.

S2, install reinforcing bars, anchor plates and prestressed tunnels 7, which are divided into operation steps:

(1) First pop out the edge of the steel bar frame around the open profiled steel plate 3, and use the steel bar positioning frame to control the spacing of the steel bars, and then install and bind the steel bars in the open profiled steel plate 3;

(2) During the installation of the reinforced skeleton sheet, install the anchor plate according to the predetermined position to ensure the installation position requirements of the anchor plate;

(3) Corrugated pipes are used for the prestressed channel 7. The top plate of the embedded anchor ring installed on the anchoring end should be perpendicular to the center line of the prestressed channel 7. The prestressed channel 7 is provided with grouting holes and exhaust holes;

S3, pouring modified high-strength concrete, referring to Figure 4, the length of the three rollers of the three-roller concrete paver is 3.5m, the diameter is 219mm, and the height of the material is 2cm higher than the track. After the side formwork is installed, the bridge deck 13, the end beams, the concrete at the continuous part of the pier top and the two sides of the middle fulcrum are poured in the later stage. Wet the surface of the box girder;

S4, curing the concrete. After the concrete is poured, the steam at 45-55°C is passed through the steam pipe for curing for 6-12 hours, and the air pressure is controlled at 1.0-1.2Mpa until the bridge deck 13, the end beam, the pier top continuous and the middle fulcrum The concrete curing on both sides reaches the design standard. The steam pipeline is connected with an electric heating steam generator. The electric heating steam generator includes a water supply system, an automatic control system, a heating system and a safety protection system. The steam generated by the electric heating steam generator is input to the concrete of the bridge deck 13 through the steam pipeline. After the high-strength concrete is poured, the standing time is 4 to 6 hours, and the ambient temperature is not lower than 10 °C; after the high-strength concrete reaches the initial strength, the concrete is heated and cured with steam, and the heating rate is not more than 8 °C/h .

In this embodiment, the modified high-strength concrete is made from the following components by weight: 40 parts of cement, 9 parts of fine sand, 22 parts of crushed stone, 55 parts of water, 6.5 parts of modified asphalt, 9 parts of metakaolin, and pulverized coal. 4 parts of ash, 0.7 part of leveling agent. Modified asphalt is made by fully mixing the following components by weight: 70 parts of base asphalt, 12 parts of red mud, 6 parts of rubber powder, 4 parts of SBS modifier, 6 parts of slaked lime, 9 parts of white mud, silicate material 0.9 servings.

Referring to Figure 5, one end of the prestressed hole 7 is the grouting end 11, the grouting end 11 is connected to the grouting pump 5, the other end of the prestressed hole 7 is the suction end 12, and the suction end 12 is branched and connected with waste pulp The container 10, the slurry storage barrel 8, the slurry storage barrel 8 is also connected with a vacuum pump 9, and the slurry pressing end 11 and the slurry suction end 12 are provided with an exhaust valve 6. The prestressed channel 7 is vacuumed until the vacuum pressure reaches -0.06～-0.1Mpa, and then the slurry is pressed into the prestressed channel 7 by the grouting pump 5, and the grouting pressure is controlled at 0.5～0.7Mpa.

Each vertex of the bellows is provided with an exhaust hole, each low point is provided with a drainage hole, each vertex and both ends are provided with inspection holes, and the exhaust holes and the drainage holes are respectively connected with exhaust holes. Pipe and drain pipes, grouting pipes, exhaust pipes and drain pipes are standard pipes or suitable plastic pipes with a minimum inner diameter of 20mm.

The working principle of the construction method of the modified high-strength concrete corrugated roof composite bridge deck 13 disclosed in this embodiment is as follows: the construction method is divided into the steps of laying profiled steel plates, installing steel bars, anchor plates and prestressed tunnels 7 steps, pouring modification The high-strength concrete step and the curing concrete step, the concrete pouring is divided into the bridge deck 13 concrete, the end beam fine stone concrete, the continuous part of the pier top, and the concrete on both sides of the middle fulcrum. The bridge deck 13 concrete is poured in two steps. Steam curing, so as to ensure the construction quality of the bridge deck 13. During the concrete pouring process, the pre-camber detection should be carried out at any time. If the pre-camber changes too much, measures should be taken to adjust it in time to ensure the construction quality of the steel box girder 1.

In addition, the construction method adopts the modified high-strength concrete material with high elastic modulus and high tensile and compressive strength as the bridge deck structure layer. For maintenance purposes, the use of the modified concrete can greatly reduce the thickness and self-weight of the structural layer, and improve the durability of the composite bridge deck 13 . The invention adopts the same method as the corrugated web to roll the corrugated top plate, and replaces the U-rib welding of the top plate, greatly reduces the number of welding seams, realizes mechanized welding of all welding seams, improves the manufacturing efficiency and controls the welding quality.

The embodiments of this specific embodiment are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore: all equivalent changes made according to the structure, shape and principle of the present invention should be covered in within the protection scope of the present invention.

Claims (10)

1. a construction method of modified high-strength concrete corrugated roof composite bridge deck, is characterized in that, comprises following processing steps: S1, laying profiled steel plates, the current bridge deck (13), the web linings on both sides of the middle fulcrum, and the concrete (4) at the end beam supports are cured, first install the cantilever (2) of the steel box girder (1). ) and between the boxes respectively lay open profiled steel plates (3), and then install plug plates on the ends of the open profiled steel plates (3); S2, install reinforcing bars, anchor plates and prestressed tunnels (7), which are divided into operation steps: (1) First pop out the edge of the steel frame around the open profiled steel plate (3), and use the steel bar to locate the frame to control the spacing of the steel bars, and then install and bind the steel bars in the open profiled steel plate (3); (2) During the installation of the reinforced skeleton sheet, install the anchor plate according to the predetermined position to ensure the installation position requirements of the anchor plate; (3) Corrugated pipes are used for the prestressed tunnel (7). The top plate of the embedded anchor ring installed on the anchoring end should be perpendicular to the centerline of the prestressed tunnel (7). The prestressed tunnel (7) is provided with grouting holes and exhaust. hole; S3, pouring the modified high-strength concrete, pouring the bridge deck (13) in the later stage, the end beams, the continuous part of the pier top and the concrete on both sides of the middle fulcrum after the installation of the side formwork, the three-roller concrete paver runs at 30-40m/h The construction is carried out at a high speed of distribution, and the surface of the box girder is wetted by spraying water before the distribution; S4, curing the concrete. After the concrete is poured, the steam at 45-55°C is introduced through the steam pipe for curing for 6-12 hours, and the air pressure is controlled at 1.0-1.2Mpa until the bridge deck (13), the end beam, the pier top continuous and The concrete curing on both sides of the central fulcrum reaches the design standard. 2. The construction method of modified high-strength concrete corrugated roof composite bridge deck according to claim 1, characterized in that: the modified high-strength concrete is made of the following components by weight: 35-45 parts of cement, fine 8-10 parts of sand, 20-25 parts of gravel, 50-60 parts of water, 5.5-7.5 parts of modified asphalt, 8-10 parts of metakaolin, 3-5 parts of fly ash, and 0.6-0.8 parts of leveling agent. 3. The construction method of modified high-strength concrete corrugated roof composite bridge deck according to claim 1, characterized in that: the modified asphalt is made by fully mixing the following components by weight: 60-80 parts of base asphalt , 10 to 15 parts of red mud, 5 to 7 parts of rubber powder, 2.5 to 5.5 parts of SBS modifier, 5 to 7 parts of slaked lime, 8 to 10 parts of white mud, and 0.3 to 1.6 parts of silicate materials. 4. The construction method of modified high-strength concrete corrugated roof composite bridge deck according to claim 1, characterized in that: one end of the prestressed tunnel (7) is a grouting end (11), and the grouting end (11) ) is connected with the grouting pump (5), the other end of the prestressed hole (7) is the suction end (12), and the suction end (12) is branched with a waste slurry container (10) and a slurry storage bucket (8) , the slurry storage barrel (8) is also connected with a vacuum pump (9). 5. The construction method of the modified high-strength concrete corrugated roof composite bridge deck according to claim 4, wherein the prestressed tunnel (7) is subjected to vacuum treatment until the vacuum pressure reaches -0.06～-0.1 Mpa range, and then press the slurry into the prestressed hole (7) through the grouting pump (5), and the grouting pressure is controlled at 0.5-0.7Mpa. 6. The construction method of modified high-strength concrete corrugated roof composite bridge deck according to claim 1, characterized in that: the beam top of the steel box girder (1) is laid with a corrugated roof, and the grooves of the corrugated roof and the steel bars Matching positioning. 7. The construction method of modified high-strength concrete corrugated roof composite bridge deck according to claim 1, characterized in that: the length of the three rollers of the three-roller concrete paver is 3.5m, and the diameter is 219mm, The height of the fabric is 2cm higher than the track. 8. The construction method of the modified high-strength concrete corrugated roof composite bridge deck according to claim 1, wherein each vertex position of the corrugated pipe is provided with an exhaust hole, and each low point position is provided with an exhaust hole. There are drainage holes, each vertex and both ends are provided with inspection holes, and the exhaust holes and the drainage holes are respectively connected with an exhaust pipe and a drainage pipe. 9. The construction method of modified high-strength concrete corrugated roof composite bridge deck according to claim 1, wherein the steam pipeline is connected with an electric heating steam generator, and the electric heating steam generator comprises a water supply system, an automatic control system , heating system and safety protection system, the steam generated by the electric heating steam generator is input to the concrete of the bridge deck (13) through the steam pipeline. 10. The construction method of the modified high-strength concrete corrugated roof composite bridge deck according to any one of claims 1 to 9, wherein after the high-strength concrete is poured, the standing time is 4-6 hours, and the standing time is 4-6 hours. The ambient temperature is not lower than 10°C; after the high-strength concrete reaches the initial strength, the concrete is heated and cured by passing in steam, and the heating rate is not more than 8°C/h.

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