CN113202031A - Method for paving ultrahigh-performance concrete on bridge steel bridge deck - Google Patents
Method for paving ultrahigh-performance concrete on bridge steel bridge deck Download PDFInfo
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- CN113202031A CN113202031A CN202110416072.4A CN202110416072A CN113202031A CN 113202031 A CN113202031 A CN 113202031A CN 202110416072 A CN202110416072 A CN 202110416072A CN 113202031 A CN113202031 A CN 113202031A
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 216
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 109
- 239000010959 steel Substances 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005507 spraying Methods 0.000 claims description 29
- 239000004567 concrete Substances 0.000 claims description 28
- 238000003860 storage Methods 0.000 claims description 20
- 239000007921 spray Substances 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 16
- 238000012423 maintenance Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 14
- 238000009499 grossing Methods 0.000 claims description 9
- 238000010030 laminating Methods 0.000 claims description 8
- 210000002489 tectorial membrane Anatomy 0.000 claims description 6
- 239000011378 shotcrete Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000013011 mating Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 31
- 239000007888 film coating Substances 0.000 abstract description 6
- 238000009501 film coating Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 32
- 238000002156 mixing Methods 0.000 description 27
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- 206010016807 Fluid retention Diseases 0.000 description 1
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- 238000005266 casting Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
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- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012840 feeding operation Methods 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
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Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Machines (AREA)
Abstract
The invention relates to a method for paving ultra-high performance concrete on a bridge steel bridge deck, which comprises the following steps: erecting tracks along the paving and pouring direction of the bridge steel bridge deck, wherein the tracks are erected on supporting brackets which are supported on a steel bridge deck and a steel curb of the bridge steel bridge deck; the ultrahigh-performance concrete spreader and the movable feeding equipment move synchronously and in the same direction on the track along the bridge steel bridge deck, and the movable feeding equipment feeds ultrahigh-performance concrete to the ultrahigh-performance concrete spreader; and (3) dismantling the steel supports on the support brackets, and sequentially erecting an ultrahigh-performance concrete leveling machine, an ultrahigh-performance concrete film coating machine and intelligent finishing equipment on the track along the paving and pouring direction of the bridge steel bridge deck. The invention has the advantages that: the paving efficiency and the construction quality of the ultra-high performance concrete are improved.
Description
Technical Field
The invention relates to the technical field of ultra-high performance concrete pavement construction, in particular to a method for paving ultra-high performance concrete on a bridge steel bridge deck.
Background
At present, due to the defects of low tensile strength, poor toughness, incapability of effectively controlling crack development after cracking and the like of common concrete, the premature deterioration of a concrete structure can not be used continuously, and the durability and the service life of the concrete structure are greatly reduced. To overcome these disadvantages of concrete, Ultra High Performance Concrete (UHPC), which is a cement-based material, is proposed for application in concrete by systematic design, optimization and adjustment of the material system using particle close packing theory, fracture mechanics and micro mechanics principles, and addition of 1-3 volume fraction of fibers. The ultra-high performance concrete can obviously improve the tensile capacity and the shear resistance of the concrete, so the ultra-high performance concrete has good toughness, can effectively control the development of the concrete, and is gradually applied to actual engineering.
The ultrahigh-performance concrete has high strength and good expansibility, but is usually relatively viscous and contains steel fibers, so that a paving operation mode mainly using manpower is not suitable for being adopted during the paving operation of the bridge deck, the traditional pavement paving equipment needs to be modified and then can be used, and special equipment is usually adopted for paving.
When UHPC paving is carried out by adopting the existing construction method, the mechanization degree of equipment is low, the UHPC paving is influenced by site construction conditions, continuous feeding of the UHPC cannot be ensured, and the UHPC after paving is finished needs steam curing.
Meanwhile, when the bridge deck is paved, a paving operation mode mainly using manpower is not suitable, and special equipment is usually adopted for paving. The prevailing paving equipment special for UHPC in the market mainly comprises a special UHPC material distributor, a special UHPC evener, a special UHPC film laminating machine and the like. When the UHPC special paving equipment is used, a guide rail is erected on the bridge floor to be used as a supporting device of the UHPC special paving equipment. When the pavement of the bridge deck of the existing bridge is implemented, usually, due to the steel curb of the bridge deck of the existing bridge, the guide rails of UHPC special pavement equipment cannot be laid at the ends of two sides of the bridge deck. This probably leads to when the bridge floor both sides pave ultra high performance concrete, the cloth machine can not fill the distributing material, and the evener can not fully be leveled to and the condition that the membrane machine of spreading can not the comprehensive tectorial membrane takes place. In this case, joint-separating construction is generally adopted in the construction, that is, the steel guide rail is laid on the inner side of the steel curb of the active bridge to perform UHPC mechanical paving, and a construction joint is arranged, and then the steel guide rail and the equipment are removed to perform manual paving construction on two sides. The construction method is common, but the construction seams with longer two sides can possibly cause water seepage, so that the steel bridge deck is damaged.
Because the ultra-high performance concrete is gradually applied to actual engineering in recent years, including the reinforcement and repair of active bridges, the ultra-high performance concrete paving construction process and equipment suitable for the special situation need to be improved and optimized.
Disclosure of Invention
The invention aims to provide a method for paving ultra-high performance concrete on a bridge steel bridge deck, which is characterized in that a support bracket is arranged on the bridge steel bridge deck to lay a track, and then a continuous material distributor, a evener, a film coating machine and intelligent finishing equipment are arranged on the track, so that the paving construction of the ultra-high performance concrete with large area, high efficiency, high precision and high quality is realized.
The purpose of the invention is realized by the following technical scheme:
a method for paving ultra-high performance concrete on a bridge steel bridge floor is characterized by comprising the following steps: the paving method comprises the following steps:
erecting tracks along the paving and pouring direction of the bridge steel bridge deck, wherein the tracks are erected on supporting brackets which are supported on a steel bridge deck and a steel curb of the bridge steel bridge deck;
erecting an ultrahigh-performance concrete spreader on the track, wherein the ultrahigh-performance concrete spreader can move on the track, and meanwhile arranging a movable feeding device on one side of the ultrahigh-performance concrete spreader, so that the ultrahigh-performance concrete spreader and the movable feeding device move on the track in the same direction and synchronously along the bridge direction of the bridge steel bridge deck, the ultrahigh-performance concrete spreader distributes ultrahigh-performance concrete on the bridge steel bridge deck, and the movable feeding device feeds the ultrahigh-performance concrete to the ultrahigh-performance concrete spreader;
demolish the steel shotcrete on the support bracket, follow the direction is pour in mating formation of bridge steel bridge face erect ultra-high performance concrete evener, ultra-high performance concrete laminating machine and intelligent smoothing equipment on the track in proper order, ultra-high performance concrete evener, ultra-high performance concrete laminating machine and intelligent smoothing equipment all can remove on the track, ultra-high performance concrete evener is used for carrying out the flattening to ultra-high performance concrete, ultra-high performance concrete laminating machine is used for carrying out the tectorial membrane maintenance on the ultra-high performance concrete after the flattening, intelligent smoothing equipment is used for right ultra-high performance concrete carries out secondary smoothing and tectorial membrane maintenance.
The support bracket comprises a track beam, a steel support and a steel base plate; erecting one end of the track beam above the steel curb, extending the other end of the track beam to the inner side of the steel curb, arranging the steel support below the track beam positioned at the inner side of the steel curb, and fixing the steel support on the bridge steel deck; erecting the rail on the rail cross beam positioned on the inner side of the steel curb.
The movable feeding equipment comprises UHPC stirring and feeding equipment, the UHPC stirring and feeding equipment and the ultra-high performance concrete spreader are erected on the same track, and both the UHPC stirring and feeding equipment and the ultra-high performance concrete spreader can move synchronously along the same direction of the track; a dry mixture transport vehicle is arranged in front of the UHPC stirring and feeding equipment, and the dry mixture transport vehicle stores the UHPC dry mixture; the dry mixture is hung into the material storage box by the hoisting system.
The movable feeding equipment comprises a concrete pump truck, and the concrete pump truck and the ultrahigh-performance concrete spreader move in the same direction and synchronously and feed materials to the ultrahigh-performance concrete spreader.
The intelligent finishing equipment comprises a movable walking type finishing truss, wherein a film uncovering device, a spraying humidifying device, a finishing device, a film covering device and an intelligent control system are arranged on the walking type finishing truss, the walking type finishing truss is erected on the track, and the film uncovering device, the finishing device and the film covering device are sequentially arranged from front to back along the moving direction of the walking type finishing truss; the film uncovering device is used for uncovering the maintenance film covered on the ultra-high performance concrete by the ultra-high performance concrete film covering machine, the troweling device is used for troweling the ultra-high performance concrete, the film covering device is used for covering film maintenance on the trowelled ultra-high performance concrete, and the spray humidifying device is used for spray humidifying the ultra-high performance concrete; the intelligent control system is connected with and controls the working states of the film uncovering device, the troweling device, the spraying humidifying device and the film covering device.
The troweling device comprises a vibration motor, a spring and a troweling plate, wherein the vibration motor is fixedly connected with one end of the spring, and the other end of the spring is fixedly connected with the troweling plate; the wiping plate is driven by the vibration motor to realize vibrating wiping.
The troweling device comprises a troweling machine, a fixing plate, a spring, a gasket, a pressure sensor and a fixing frame, wherein the troweling machine is fixedly installed on the fixing frame, the spring is arranged between the fixing plate and the fixing frame, one end of the spring is in contact with the fixing plate, the other end of the spring is in contact with the pressure sensor through the gasket, and the pressure sensor is in signal connection with the intelligent control system to transmit stress signals of the pressure sensor.
The invention has the advantages that:
1) the existing steel curb and the detachable square steel pipe are used as stress supporting points, the construction space under the bridge is not occupied, the overall structure is simple, the manufacturing is convenient, and the detachment is convenient. After disassembly, the supporting device can still enable the laminating machine and the like to pass through. The support device can avoid setting longer construction joints when being used for carrying out the construction of the ultrahigh-performance concrete of the bridge deck of the existing bridge, and greatly reduces the condition that the steel bridge deck is damaged by the seepage of the construction joints. And the use of the supporting device is beneficial to saving materials, shortening the construction period and saving the cost, and can be used in the field of ultra-high performance concrete construction.
2) The steel plate pavement is paved on the steel bar net, and the concrete mixer truck and the pump truck supply materials for the distributing machine on the steel plate pavement, so that the long-distance continuous pavement is realized.
3) The secondary plastering and pressing adopts intelligent plastering equipment, integrates the functions of film uncovering, spraying humidification, plastering and pressing, film covering and the like, is controlled by an intelligent system, and compared with the secondary plastering and pressing construction of large-area ultrahigh-performance concrete, the secondary plastering and pressing construction method adopts a disc type or blade type plastering and pressing machine manually, so that the problems of low construction efficiency, long operation time, easy carrying of steel fibers, difficulty in controlling of flatness and the like are solved; the secondary is smeared and is pressed efficiency and improve greatly, the construction continuity reinforcing for the secondary is smeared and is pressed the in-process initial set concrete and is shortened greatly from taking off the membrane to smearing and pressing the total time to the tectorial membrane, reduced the exposure time of initial set concrete in the air, prevent early fissured production, it is whole pleasing to the eye to show the quality and the effect that have improved the secondary of super high performance concrete pavement layer and have been smeared and press to realize, simultaneously, the high-efficient operation of system has been realized, the datamation of information has reduced the human cost. The support guarantee of intelligent mechanical equipment is provided for the development of the field of large-area construction of the ultra-high performance concrete, such as the fields of bridge engineering, industrial plants, large-scale exhibition centers and other building engineering.
The normal-temperature curing method combining the secondary plastering and pressing and the under-film irrigation water retention curing can greatly reduce the risk of the generation of large-area thin-layer UHPC pavement cracks, avoid steam curing, improve the efficiency and reduce the cost and the energy consumption. Meanwhile, labor input is saved, and construction quality is greatly improved.
Drawings
FIG. 1 is a floor plan of the present invention;
FIG. 2 is a schematic view of the track structure of the present invention;
FIG. 3 is a plan view of another portable fabric of the present invention;
FIG. 4 is a schematic diagram of the UHPC agitator feeder of FIG. 3;
FIG. 5 is a top view of FIG. 4;
fig. 6 is a schematic structural diagram of an intelligent troweling apparatus according to the present invention;
FIG. 7 is a side view of FIG. 6;
FIG. 8 is a schematic diagram of the structure of the suspension troweling system shown in FIG. 6;
FIG. 9 is a side view of another intelligent finishing device in the present invention;
fig. 10 is a schematic view of the overall structure of fig. 9.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
as shown in fig. 1-10, the symbols 1-77 are respectively shown as:
the system comprises a support bracket 1, a track 2, an ultrahigh-performance concrete spreader 3, an ultrahigh-performance concrete leveler 4, an ultrahigh-performance concrete film coating machine 5, intelligent finishing equipment 6, a steel curb 7, a steel plate 8, reinforcing mesh and studs 9, a concrete mixer truck 10, a concrete pump truck 11, a spreader hopper 12, an UHPC (ultra high performance concrete) paving layer 13, a track cross beam 14, a steel bridge deck 15, a steel support 16, a steel base plate 17, a pressing plate 18 and a welding spot 19;
UHPC stirring and feeding equipment 20, a dry mixture transport vehicle 21, an UHPC stirrer 22, an intelligent control system 23, a hoisting system 24, a dry powder storage tank 25, a steel fiber storage tank 26, a mixing water tank 27, a liquid admixture storage tank 28, a mixing water metering pump 29, a liquid admixture metering pump 30, a concrete conveying pump 31, a traveling system 32, a discharge port 33, an operation platform 34, a support 35, a rail guardrail 36, a feed hopper 37, a motor system 38, a labor protection product warehouse 39, a tool warehouse 40, a small water tank 41, an UHPC paving layer 42 and a truss rail plate 43;
the device comprises a walking type plastering and pressing truss 44, a film uncovering device 45, a spraying and humidifying device 46, a hanging plastering system 47, a film covering device 48, an intelligent control system 49, a track walking device 50, a sun shield 51, a lifting device 52, a press roller 53, a lifting adjusting device 54, a waste film collecting box 55, a spraying and humidifying device 56, a spraying and humidifying device 57, a spraying and humidifying device 58, a fixing bolt 59, a fixing plate 60, a spring 61, a gasket 62, a pressure sensor 63, a fixing frame 64, a plastering machine 65 and a plastering surface 66;
the device comprises a walking type plastering truss 67, a film uncovering device 68, a first spraying humidifying device 69, a second spraying humidifying device 70, a plastering device 71, a film covering device 72, an intelligent control system 73, a walking track device 74, a plastering plate 75, a spring 76 and a water tank 77.
Example (b): as shown in fig. 1 and 2, the method for paving ultra high performance concrete on a bridge steel deck in the present embodiment is used for paving Ultra High Performance Concrete (UHPC) on a bridge steel deck. A steel bar mesh and studs 9 are arranged on the bridge steel bridge surface, and the studs are arranged on the steel bridge deck 15 and are connected and fixed with the steel bar mesh; the studs acting as shear studs in combination with the mesh reinforcement effectively join together the ultra high performance concrete and the steel deck slab 15 to form a steel-UHPC composite structure.
As shown in fig. 1 and 2, the paving method in this embodiment includes the following steps:
1) firstly, a track 2 arranged along the bridge direction is erected on the steel bridge deck 15, and the track 2 is used as a running track of the ultrahigh-performance concrete spreader 3, so that the ultrahigh-performance concrete spreader 3 can run along the bridge direction, and the distribution of the ultrahigh-performance concrete is realized.
As shown in fig. 1, the rails 2 are erected by the support brackets 1 erected on both sides of the steel deck 15, and the support brackets 1 are uniformly spaced along the bridge steel deck along the bridge direction. As shown in fig. 2, the body of the support bracket 1 includes a track beam 14 and a steel support 16. One end of the track cross beam 14 is supported on the steel curb 7 and is welded and fixed with the steel curb by a welding point 19; the other end of the steel plate extends towards the inner side of the steel curb 7, a steel support 16 is arranged below the extending end of the track beam 14, the top end of the steel support 16 is welded and fixed with the steel curb 7, and the bottom end of the steel support is supported on a steel bridge deck 15 through a steel backing plate 17. The rail 2 is mounted on the rail cross member 14, and pressing plates 18 are respectively provided on both sides of the rail 2 to ensure stability of the rail 2.
2) An ultra-high performance concrete spreader 3 is erected between the two side rails 2, and the ultra-high performance concrete spreader 3 is carried on and travels along the rails 2.
In this embodiment, a concrete pumping device may be disposed in front of the laying direction of the ultra-high performance concrete distributor 3, and the device includes a concrete mixer truck 10 and a concrete pump truck 11, where the concrete mixer truck 10 is used to store the ultra-high performance concrete and keep the performance of the ultra-high performance concrete through stirring, and the concrete pump truck 10 pumps the ultra-high performance concrete to the distributor hopper 12 of the ultra-high performance concrete distributor 3 through a pipeline to realize synchronous feeding, so as to effectively solve the problems of large feeding loss in the stirring and feeding processes, too long time in the mixing material stirring and discharging-in-situ casting process, and influence on construction. In order to prevent the concrete mixer truck 10 and the concrete pump truck 11 from damaging the underlying mesh reinforcement and the stud 9 during driving, a steel plate 8 is laid in the area where the truck is driving to protect the mesh reinforcement and the stud 9.
In addition to the above-mentioned movable material distribution method, the present embodiment can also realize the synchronous feeding of the ultra-high performance concrete material distributor 3 during material distribution by another movable material distribution method as shown in fig. 3-5.
Specifically, as shown in fig. 3 to 5, a UHPC mixing and feeding apparatus 20 and an ultra-high performance concrete distributor 3 are installed on the track 2, and both are movable along the track 2 and can be configured to move synchronously. The UHPC mixing and feeding device 20 is configured to supply the UHPC processed and manufactured to a feed hopper 37 (i.e., a distributor hopper 12) of the ultra-high performance concrete distributor 3, and the ultra-high performance concrete distributor 3 is configured to distribute the UHPC on the surface of the steel bridge deck. A dry mixture transport vehicle 21 is further arranged in front of the UHPC stirring and feeding device 20, and the dry mixture transport vehicle 21 is used for storing dry mixtures required by the UHPC stirring and feeding device 20 during processing and manufacturing UHPC.
The UHPC stirring and feeding device 20 and the dry mixture transport vehicle 21 are combined to form a movable feeding device of the ultra-high performance concrete spreader 3. When the UHPC dosing and mixing device 20 has sufficient storage space, that is, the UHPC dosing and mixing device 20 can store the amount of UHPC required by the ultra-high performance concrete spreader 3, the dry mix truck 21 is not required, and only the UHPC dosing and mixing device 20 is used.
As shown in fig. 4 and 5, the main body of the UHPC mixing and feeding device 20 in this embodiment includes a truss track plate 43, which is an arrangement area for each functional device above the truss track plate 43, and operation platforms 34 are provided on both sides of the truss track plate 43 for the operator to perform mixing and feeding operations. A walking system 32 is arranged at the bottom of the truss track plate 43; under the drive of the traveling system 32, the whole feeding platform can move along the track 2, and the moving speed and the moving direction of the feeding platform can be controlled to enable the feeding platform and the ultra-high performance concrete distributor 3 to move synchronously, so that the on-site mixing and distribution of the UHPC can be carried out synchronously, the transport distance of the UHPC can be effectively shortened, and the construction quality of the UHPC can be effectively improved.
As shown in fig. 4, a dry powder storage tank 25 for storing each raw material of UHPC, a steel fiber storage tank 26, a blending water tank 27, and a liquid admixture storage tank 28 are provided on the truss track plate 43, wherein the dry powder storage tank 25 is used for storing dry UHPC powder, the steel fiber storage tank 26 is used for storing steel fiber for UHPC, the blending water tank 27 is used for storing blending water used in the fabrication of UHPC, and the liquid admixture storage tank 28 is used for storing admixtures such as water reducing agent, plasticizer, retarder, early strength admixture, etc. used in the fabrication of UHPC.
As shown in fig. 5, in this embodiment, a small water tank 41 is disposed on the truss track plate 43, the small water tank 41 is connected to the mixing water tank 27, and the mixing water stored in the mixing water tank 27 is pumped into the small water tank 41 and then pumped into the UHPC mixer 22 through the small water tank 41, so as to precisely control the water amount.
As shown in fig. 4, the UHPC mixer 22 and the hoist system 24 are installed on the truss track plate 43. Wherein the UHPC blender 22 is in communication with a tank 27 for blending water and a tank 28 for liquid admixture via lines such that the blending water and liquid admixture may be supplied to the interior of the UHPC blender 22 via the lines. The mixing water tank 27 is provided with a mixing water metering pump 29, and the mixing water can be pumped into the interior of the UHPC mixer 22 by this mixing water metering pump 29, and the water supply thereof is precisely controlled by the mixing water metering pump 29. Likewise, the liquid admixture storage tank 28 is provided with a liquid admixture metering pump 30, and the liquid admixture can be pumped into the interior of the UHPC blender 22 by the liquid admixture metering pump 30 and the amount thereof can be precisely controlled. The hoist system 24 is used to hoist the UHPC dry powder from the dry powder storage bin 25 and the steel fibers from the steel fiber storage bin 26 through the feed hopper 24 into the UHPC blender 22. The UHPC stirrer 22 can drive the stirring blades thereof to fully stir the UHPC dry powder, the steel fibers, the stirring water and the admixture which are put into the UHPC stirrer by the motor system 25, thereby processing and manufacturing the UHPC on a construction site.
As shown in fig. 4, a concrete delivery pump 31 is provided at a position of a discharge port 33 of the UHPC mixer 22, and the UHPC finished product discharged from the discharge port 33 is directly discharged into the concrete delivery pump 31 and pumped into the ultra-high performance concrete distributor 3 by the concrete delivery pump 31 to be subjected to distribution of the UHPC. In this embodiment, a guide plate arranged obliquely downward may be provided at the position of the discharge port 33 to guide the UHPC finished product into the concrete delivery pump 31.
As shown in FIG. 4, in order to avoid the influence of the vibration of the UHPC mixer 22 during mixing on the stability of the truss track plate 43, a bracket 35 is arranged at the bottom of the UHPC mixer 1, and the bracket 35 supports the UHPC mixer 22 and lifts the UHPC mixer from the truss track plate 43 by a certain height, thereby ensuring the use safety.
As shown in FIG. 4, UHPC blender 22 is provided with an intelligent control system 23, which intelligent control system 23 is operably connected to control the operating conditions of UHPC blender 22 to process UHPC to produce different parameter requirements. In this embodiment, the intelligent control system 23 may further be connected to and control the mixing water metering pump 29 and the liquid admixture metering pump 30 to respectively adjust the mixing water and the liquid admixture usage amounts.
As shown in fig. 4, rail guards 36 are provided on both sides of the feeding platform for safety of the operator. As shown in fig. 1, a work storage 39 and a tool storage 40 for storing work and tools used in the corresponding areas are further provided at one side of the truss track plate 43.
In this embodiment, since a plurality of admixtures can be stored in the liquid admixture storage tank 28, the amount of each admixture can be precisely controlled by piping or by providing a plurality of liquid admixture metering pumps 30.
The UHPC dry powder stored in the dry powder storage bin 25 may be provided in standard packaging for quantitative control during lifting and delivery using the lifting system 24. The steel fibers in the fiber storage tank 26 may also be stacked in the same manner for quantitative control.
The traveling system 19 may employ some existing traveling driving mechanisms, for example, including a driving motor and a roller, and a guide rail is laid in the construction site, so that the guide rail moves in the direction of the guide rail under the driving of the driving motor.
3) And starting the ultrahigh-performance concrete distributing machine 3 to distribute the ultrahigh-performance concrete on the steel bridge deck 15. At the moment, because the supporting brackets 1 are arranged at intervals along the bridge direction, when the ultrahigh-performance concrete spreader 3 running on the track 2 spreads the materials, the ultrahigh-performance concrete can pass through gaps among the supporting brackets 1, so that the full-section paving and pouring of the steel bridge deck 15 are realized, a post-pouring belt is not reserved, and the risk is avoided.
4) After the ultra-high performance concrete spreader 3 finishes one horizontal cloth, it walks along vertical (following the bridge to), and the walking distance is the width of one horizontal cloth, and the steel shotcrete 16 under the track crossbeam 14 of the position below of ultra-high performance concrete spreader 3 before the manual work is demolishd this moment uses ultra-high performance concrete evener 4 to carry out the flattening to the cloth region afterwards, and the ultra-high performance concrete evener 4 chooses for use self-propelled high frequency low amplitude flat machine that shakes, and the evener vertically walks. Since the steel struts 16 below the track beams 14 have been removed, the screed panel width of the ultra high performance concrete screed 4 may extend to the inside of the steel curb of the paved surface, the same as the bridge deck pavement width, achieving leveling along the transverse full bridge deck.
Similarly, an ultra-high performance concrete coating machine 5 and an intelligent troweling device 6 are also erected on the track 2 behind the ultra-high performance concrete leveling machine 4 to perform operations such as spray coating maintenance and troweling on the distributed UHPC pavement layer 13, so as to improve the distribution quality of the ultra-high performance concrete. Wherein, the secondary plastering and pressing and the film covering maintenance of the intelligent plastering equipment 6 are carried out within 2 hours of the final setting of the ultra-high performance concrete. And after the ultrahigh-performance concrete is finished for 24 hours, irrigating water under the film and curing at normal temperature.
The intelligent plastering equipment 6 in the embodiment can realize secondary plastering and pressing of large area, high efficiency, high precision and high quality on paved ultra-high performance concrete so as to effectively improve the paving quality of the ultra-high performance concrete.
As shown in fig. 6 and 7, the track traveling device 50 is disposed at the bottom of the intelligent troweling apparatus in this embodiment, so that the traveling troweling truss 44 can move along the paving direction of the ultra-high performance concrete. Along the moving direction of the walking type plastering truss 44, the walking type plastering truss 44 is sequentially provided with a film uncovering device 45, a spraying humidifying device 56, a hanging plastering system 47, a spraying humidifying device 57, a spraying humidifying device 58 and a film covering device 48, and the functional components are arranged one by one according to the flow of the ultrahigh-performance concrete during plastering so as to realize the continuous operation of plastering the ultrahigh-performance concrete.
Wherein, along the moving direction of the walking type plastering truss 44, a film uncovering device 45 is firstly arranged, the film uncovering device 45 is used for uncovering the maintenance film covered on the ultrahigh performance concrete, the maintenance film is applied by the ultrahigh performance concrete film coating machine 5, and the recovered maintenance film can be intensively placed into the waste film collecting box 55. A first spray humidifying device 56 is arranged behind the membrane uncovering device 45, and the spray humidifying device 56 is used for spray humidifying the ultra-high performance concrete after membrane uncovering so as to improve the plastering quality. And a suspended troweling system 47 is arranged behind the spray humidifying device 56, and the suspended troweling system 47 is used for troweling the ultrahigh-performance concrete. A spray humidifying device 56 and a spray humidifying device 57 are arranged behind the suspended plastering system 47, and are used for spray humidifying the plastered ultrahigh-performance concrete and then cooperating with the subsequent film covering of the film covering device 48 to perform film covering maintenance on the plastered ultrahigh-performance concrete.
In the embodiment, the film uncovering device 45, the spray humidifying device 46 (consisting of a spray humidifying device 56, a spray humidifying device 57 and a spray humidifying device 58), the suspension troweling system 47 and the film covering device 48 are all connected and controlled by an intelligent control system 49, so that the construction quality and the construction efficiency of secondary compaction troweling are greatly improved.
As shown in fig. 7, a sun shield 51 is arranged above the suspended plastering system 47, when the ultra-high performance concrete at the position where the curing film is uncovered has not reached the final set, the secondary compacting and plastering cannot be performed, at this time, the sun shield 51 can shield the direct sunlight, and simultaneously, the spray humidifying device 56, the spray humidifying device 57 and the spray humidifying device 58 are opened to perform spray humidifying, so that the ultra-high performance concrete layer after the film is uncovered is prevented from being rapidly dehydrated and cracked.
As shown in fig. 8, the suspension troweling system 4 is composed of a fixing bolt 59, a fixing plate 60, a spring 61, a gasket 62, a pressure sensor 63, a fixing frame 64, and a troweling machine 65. The troweling machine 65 is fixedly mounted on the fixing frame 64 through the fixing bolt 59 and the fixing plate 60. The spring 61 is arranged between the fixing plate 60 and the fixing frame 64, the bottom end of the spring is abutted against the fixing plate 60, and the top end of the spring is abutted against the pressure sensor 63 fixed below the fixing frame 64 through the gasket 62; the stress signal of the troweling machine 65 can be transmitted to the pressure sensor 63 through the spring 61, and the stress signal of the pressure sensor 63 is transmitted to the intelligent control system 49.
When the troweling operation is performed, the intelligent control system 49 sends an instruction, the fixing frame 64 descends slowly, the pressure sensor 53 transmits pressure data to the intelligent control system 49 in real time, when the pressure value reaches a set value, the fixing frame 64 stops descending, and the troweling machine 65 starts the troweling operation. Because the spring 61 is arranged at the connecting part of the troweling machine 65 and the fixing frame 64, the troweling surface 66 of the blade or the disc of the troweling machine 65 is always tightly attached to the surface of the ultra-high performance concrete layer and is kept within a set pressure range (2.5-3.5 KPa), and the secondary compacting and troweling effect is greatly improved.
As shown in fig. 6, the number of suspended finishing systems 47 can be selected according to the actual paving width, and is generally 1-2. In this embodiment, two suspended troweling systems 47 are arranged on the walking-type troweling truss 44, and the two suspended troweling systems 47 can move along the transverse direction of the walking-type troweling truss 44, so that the troweling of the whole width is realized, and the construction efficiency is effectively improved.
As shown in fig. 7, the film coating device 48 is provided with a compression roller 53, the compression roller 53 is connected with an elevation adjusting device 54, the compression roller 53 can be used for flattening the curing film coated by the film coating device 48, and the elevation adjusting device 54 can adjust the working height of the compression roller 53 to meet the requirement of flattening the curing film.
In addition to the intelligent troweling apparatus 6 described above, the present embodiment may also satisfy the requirements by another intelligent troweling apparatus as shown in fig. 9 to 10.
Specifically, as shown in fig. 9 and 10, the intelligent troweling equipment main body includes a walking type troweling truss 67, a walking rail device 74 is disposed at the bottom of the walking type troweling truss 67, and the walking rail device 74 can move the walking type troweling truss 67 on the track 2, so as to trowel paved ultrahigh-performance concrete.
As shown in fig. 9, a film uncovering device 68, a first spraying humidifying device 69, a finishing device 71, a second spraying humidifying device 70 and a film covering device 72 are sequentially arranged on the walking type plastering truss 67 from front to back along the moving direction of the walking type plastering truss 67, and these functional components are also arranged one by one according to the flow of the ultrahigh-performance concrete during plastering so as to realize the continuous operation of plastering the ultrahigh-performance concrete.
As shown in fig. 9, the smearing device 71 includes three sets of smearing mechanisms, each set of smearing mechanism includes a smearing plate 75, a spring 76 and a vibration motor, an output end of the vibration motor is fixedly connected to one end of the spring 76, the other end of the spring 76 is fixedly connected to the smearing plate 75, each smearing plate 75 is connected to two front and rear springs 76, and three smearing plates 75 of the three sets of smearing mechanisms are distributed in parallel. Under the drive of the vibration motor, the spring 76 can drive the plastering plate 75 to vibrate, so that the ultrahigh-performance concrete is plastered in a vibration mode, and the plastering quality is improved.
As shown in fig. 9, a water tank 77 is further disposed on the walking type troweling truss 67, and the water tank 77 is connected to the first spraying humidification device 69 and the second spraying humidification device 70 to respectively provide humidification water for the two spraying humidification devices. Metering valves for controlling the spraying amount are respectively arranged on the first spraying humidification device 69 and the second spraying humidification device 70 so as to accurately control the spraying humidification degree and further improve the wiping quality.
As shown in fig. 9, the walking type pressing truss 67 has an intelligent control system 73, and the intelligent control system 73 is connected to control the working states of the film uncovering device 68, the first spraying humidifying device 69, the second spraying humidifying device 70, the smoothing device 71 and the film covering device 72. For example, the speed of the film uncovering device 68 and the film covering device 72, the spraying amount of the first spraying humidifying device 69 and the second spraying humidifying device 70, the vibration frequency of the troweling device 71 and the like.
Although the conception and the embodiments of the present invention have been described in detail with reference to the drawings, those skilled in the art will recognize that various changes and modifications can be made therein without departing from the scope of the appended claims, and therefore, they are not to be considered repeated herein.
Claims (7)
1. A method for paving ultra-high performance concrete on a bridge steel bridge floor is characterized by comprising the following steps: the paving method comprises the following steps:
erecting tracks along the paving and pouring direction of the bridge steel bridge deck, wherein the tracks are erected on supporting brackets which are supported on a steel bridge deck and a steel curb of the bridge steel bridge deck;
erecting an ultrahigh-performance concrete spreader on the track, wherein the ultrahigh-performance concrete spreader can move on the track, and meanwhile arranging a movable feeding device on one side of the ultrahigh-performance concrete spreader, so that the ultrahigh-performance concrete spreader and the movable feeding device move on the track in the same direction and synchronously along the bridge direction of the bridge steel bridge deck, the ultrahigh-performance concrete spreader distributes ultrahigh-performance concrete on the bridge steel bridge deck, and the movable feeding device feeds the ultrahigh-performance concrete to the ultrahigh-performance concrete spreader;
demolish the steel shotcrete on the support bracket, follow the direction is pour in mating formation of bridge steel bridge face erect ultra-high performance concrete evener, ultra-high performance concrete laminating machine and intelligent smoothing equipment on the track in proper order, ultra-high performance concrete evener, ultra-high performance concrete laminating machine and intelligent smoothing equipment all can remove on the track, ultra-high performance concrete evener is used for carrying out the flattening to ultra-high performance concrete, ultra-high performance concrete laminating machine is used for carrying out the tectorial membrane maintenance on the ultra-high performance concrete after the flattening, intelligent smoothing equipment is used for right ultra-high performance concrete carries out secondary smoothing and tectorial membrane maintenance.
2. The method for paving the ultra-high performance concrete on the bridge steel deck according to claim 1, wherein the method comprises the following steps: the support bracket comprises a track beam, a steel support and a steel base plate; erecting one end of the track beam above the steel curb, extending the other end of the track beam to the inner side of the steel curb, arranging the steel support below the track beam positioned at the inner side of the steel curb, and fixing the steel support on the bridge steel deck; erecting the rail on the rail cross beam positioned on the inner side of the steel curb.
3. The method for paving the ultra-high performance concrete on the bridge steel deck according to claim 1, wherein the method comprises the following steps: the movable feeding equipment comprises UHPC stirring and feeding equipment, the UHPC stirring and feeding equipment and the ultra-high performance concrete spreader are erected on the same track, and both the UHPC stirring and feeding equipment and the ultra-high performance concrete spreader can move synchronously along the same direction of the track; a dry mixture transport vehicle is arranged in front of the UHPC stirring and feeding equipment, and the dry mixture transport vehicle stores the UHPC dry mixture; the dry mixture is hung into the material storage box by the hoisting system.
4. The method for paving the ultra-high performance concrete on the bridge steel deck according to claim 1, wherein the method comprises the following steps: the movable feeding equipment comprises a concrete pump truck, and the concrete pump truck and the ultrahigh-performance concrete spreader move in the same direction and synchronously and feed materials to the ultrahigh-performance concrete spreader.
5. The method for paving the ultra-high performance concrete on the bridge steel deck according to claim 1, wherein the method comprises the following steps: the intelligent finishing equipment comprises a movable walking type finishing truss, wherein a film uncovering device, a spraying humidifying device, a finishing device, a film covering device and an intelligent control system are arranged on the walking type finishing truss, the walking type finishing truss is erected on the track, and the film uncovering device, the finishing device and the film covering device are sequentially arranged from front to back along the moving direction of the walking type finishing truss; the film uncovering device is used for uncovering the maintenance film covered on the ultra-high performance concrete by the ultra-high performance concrete film covering machine, the troweling device is used for troweling the ultra-high performance concrete, the film covering device is used for covering film maintenance on the trowelled ultra-high performance concrete, and the spray humidifying device is used for spray humidifying the ultra-high performance concrete; the intelligent control system is connected with and controls the working states of the film uncovering device, the troweling device, the spraying humidifying device and the film covering device.
6. The method for paving the ultra-high performance concrete on the bridge steel bridge deck according to claim 5, wherein the method comprises the following steps: the troweling device comprises a vibration motor, a spring and a troweling plate, wherein the vibration motor is fixedly connected with one end of the spring, and the other end of the spring is fixedly connected with the troweling plate; the wiping plate is driven by the vibration motor to realize vibrating wiping.
7. The method for paving the ultra-high performance concrete on the bridge steel bridge deck according to claim 5, wherein the method comprises the following steps: the troweling device comprises a troweling machine, a fixing plate, a spring, a gasket, a pressure sensor and a fixing frame, wherein the troweling machine is fixedly installed on the fixing frame, the spring is arranged between the fixing plate and the fixing frame, one end of the spring is in contact with the fixing plate, the other end of the spring is in contact with the pressure sensor through the gasket, and the pressure sensor is in signal connection with the intelligent control system to transmit stress signals of the pressure sensor.
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| CN114753258A (en) * | 2022-04-27 | 2022-07-15 | 中铁十四局集团第三工程有限公司 | Construction method for paving whole bridge deck based on UHPC |
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