CN112726417A - Installation and anchoring process for UHPC precast slab of suspension bridge deck - Google Patents
Installation and anchoring process for UHPC precast slab of suspension bridge deck Download PDFInfo
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- CN112726417A CN112726417A CN202110037255.5A CN202110037255A CN112726417A CN 112726417 A CN112726417 A CN 112726417A CN 202110037255 A CN202110037255 A CN 202110037255A CN 112726417 A CN112726417 A CN 112726417A
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 167
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004873 anchoring Methods 0.000 title claims abstract description 20
- 239000000725 suspension Substances 0.000 title claims abstract description 20
- 238000009434 installation Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 46
- 239000010959 steel Substances 0.000 claims abstract description 46
- 239000004567 concrete Substances 0.000 claims abstract description 37
- 238000004321 preservation Methods 0.000 claims abstract description 19
- 238000011065 in-situ storage Methods 0.000 claims abstract description 8
- 238000012423 maintenance Methods 0.000 claims abstract description 7
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 210000003781 tooth socket Anatomy 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000009417 prefabrication Methods 0.000 claims description 3
- 239000000565 sealant Substances 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000004636 vulcanized rubber Substances 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000005266 casting Methods 0.000 abstract description 3
- 239000011384 asphalt concrete Substances 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 11
- 230000008901 benefit Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
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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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/024—Steam hardening, e.g. in an autoclave
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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
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
-
- 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
- E01D2101/26—Concrete reinforced
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- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a suspension bridge deck UHPC precast slab mounting and anchoring process, which comprises the following steps: (1) distributing a transport flat car and a gantry crane for hoisting the UHPC precast slabs on the girder truss, and matching the transport flat car and the gantry crane to finish the installation of the UHPC precast slabs; (2) performing waterproof treatment on the bottom of the UHPC precast slab; (3) installing a steel bar group at the wet joint; (4) casting UHPC concrete on the wet joint in situ; (5) moisture preservation and maintenance of wet joints; (6) and (5) performing high-temperature steam curing on the wet joint, and completing the welding-free anchoring of the bridge deck UHPC precast slab and the girder truss after the steam curing is completed. According to the invention, the steel bar group is arranged at the wet joint and the UHPC concrete is poured, after the UHPC concrete reaches the strength, the UHPC concrete of the wet joint becomes an effective connection part of a stressed whole, the local rigidity of the bridge deck is greatly improved, the stress of the bridge deck pavement layer is uniform, and the cracking risk of the asphalt concrete is reduced.
Description
Technical Field
The invention relates to the technical field of bridge structures, in particular to a process for installing and anchoring a UHPC precast slab on a bridge deck of a suspension bridge.
Background
The Ultra-High Performance Concrete (UHPC) can be called as an engineering material with the best durability, the mechanical property of the UHPC with proper reinforcement is close to that of a steel structure, and meanwhile, the UHPC has excellent wear resistance and anti-explosion Performance. Therefore, UHPC is particularly suitable for use in large span bridges, blast resistant structures (military engineering, bank vaults, etc.) and thin-walled structures, as well as in highly abrasive, highly corrosive environments. Currently, UHPC has been applied in some practical projects, such as highway and railway bridges. At present, no standard construction process exists for the installation and construction of a UHPC precast slab on a bridge floor of a suspension bridge, which often causes the problems of low construction speed, ineffective guarantee of construction quality and the like.
Disclosure of Invention
The invention aims to provide a construction process for installing a UHPC precast slab on a bridge deck of a suspension bridge, which is scientific and standard, convenient to construct and safe and reliable to operate.
The technical scheme adopted by the invention is as follows: a suspension bridge deck UHPC precast slab mounting and anchoring process comprises the following steps:
(1) and (3) installation of the UHPC prefabricated plate: the method comprises the following steps that a transportation flat car track and a gantry crane track are arranged on a main beam truss consisting of main longitudinal beams, small longitudinal beams and cross beams, a plurality of transportation flat cars for loading and transporting UHPC precast slabs are arranged on the transportation flat car track, a gantry crane is arranged on the gantry crane track, the UHPC precast slabs are hoisted to the transportation flat cars by tower cranes and then transported to preset positions by the transportation flat cars, the UHPC precast slabs are hoisted to installation positions by the gantry cranes from the transportation flat cars, so that two short edges of the UHPC precast slabs are respectively lapped on the main longitudinal beams and the small longitudinal beams or two adjacent small longitudinal beams, two long edges of the UHPC precast slabs are lapped on the two adjacent cross beams, wet joints are formed between the two adjacent UHPC precast slabs and supporting beam plates at the upper ends of the main longitudinal beams, the small longitudinal beams and the cross beams, and the installation of all the UHPC precast slabs is;
(2) coating a vulcanized rubber sealant on the contact part of the periphery of the bottom of the UHPC precast slab and the supporting beam slab for waterproof treatment;
(3) wet seam placement: the adjacent sides of two UHPC precast slabs are lapped on the same supporting beam slab, a gap of 10-60 cm is arranged between the two UHPC precast slabs, the joint end of the UHPC precast slab is step-shaped, the joint end of the step-shaped UHPC precast slabs at two sides and the supporting beam slab jointly form a T-shaped special-shaped joint space, one row or more than one row of vertical studs are welded on the supporting beam slab, overhanging steel bars extending out of the UHPC precast slabs are embedded in the UHPC precast slabs and comprise more than two upper-layer joint embedded steel bars and more than two lower-layer joint embedded steel bars, the upper-layer joint embedded steel bars and the lower-layer joint embedded steel bars extend into the T-shaped special-shaped joint space, the upper-layer joint embedded steel bars of the two adjacent UHPC precast slabs correspond to each other in position, the lower-layer joint embedded steel bars also correspond to each other in position, the upper-layer joint embedded steel bars are positioned on the upper end surface of the step of the joint end, the tooth socket structure, the joint end and the UHPC prefabricated plate are a whole formed by one-step prefabrication, longitudinal reinforcing steel bars and transverse reinforcing steel bars are distributed in the T-shaped special-shaped joint space, the longitudinal reinforcing steel bars and the transverse reinforcing steel bars are consistent in direction of the extending reinforcing steel bars of the UHPC prefabricated plate, the transverse reinforcing steel bars and the extending reinforcing steel bars of the UHPC prefabricated plate are vertically crossed, and the longitudinal reinforcing steel bars and the extending reinforcing steel bars of the UHPC prefabricated plate are arranged in;
(4) wet joint cast-in-place UHPC concrete: conveying a wet UHPC concrete material to a wet joint to finish the pouring of the wet joint, immediately vibrating the surface of the wet joint by using a flat plate vibrator, vibrating the UHPC concrete to be compact, leveling the plane of the wet joint by using a light vibrating leveling machine, and connecting the overhanging steel bars of two adjacent UHPC precast slabs into a stressed whole by pouring the UHPC concrete in situ of the wet joint;
(5) moisture preservation and maintenance of wet joints: spraying water at the wet joint, covering the wet joint with a polymer water-retaining health-preserving film, watering and preserving the moisture, wherein the moisture-retaining maintenance time is 48 hours;
(6) and (3) performing high-temperature steam curing on the wet joint: and (3) building a steam curing heat preservation shed system, introducing steam to carry out high-temperature steam curing on the wet joint, and completing the weldless anchoring of the bridge deck UHPC precast slab and the girder truss after the steam curing is finished.
Furthermore, one steel rail in the transportation flat car track is positioned on the main longitudinal beam, the other steel rail is positioned on the small longitudinal beam adjacent to the main longitudinal beam, and the main longitudinal beams on two sides of the steel rail layout of the gantry crane track are positioned on the outer side of the transportation flat car track.
Further, the track gauge of the transport flat car is larger than or equal to the maximum size of the UHPC precast slab during transportation.
Furthermore, the transportation flat car adopts storage battery power, and the operation control is realized by the remote operation control terminal.
Furthermore, UHPC concrete is stirred on site, a movable UHPC concrete stirring station is arranged at the bridge head of the main bridge in situ, and the UHPC concrete dry mixed material is stirred on site by adding water.
Furthermore, the UHPC concrete wet material is transported by a small dump truck, and a transport channel and an empty truck return channel for the dump truck to pass through are laid on two sides of the bridge floor by steel plates or wood plates.
Further, the conditions of high-temperature steam curing are as follows: the temperature is raised to 63-68 ℃ at a temperature-raising speed of not more than 12 ℃/h in the temperature-raising stage, the temperature is kept constant at 63-68 ℃ for not less than 72 hours in the constant-temperature stage, and the temperature is lowered to the normal temperature at a temperature-lowering speed of not more than 10 ℃/h in the temperature-lowering stage.
Furthermore, the steam curing heat preservation shed is carried out in a longitudinal subsection mode, each section of steam curing comprises a longitudinal wet joint and a transverse wet joint, and the coverage range at least exceeds 0.5m of the subsection joints.
Furthermore, steam enters the steam curing heat preservation shed through a steam pipeline, the steam pipeline in the steam curing heat preservation shed is uniformly arranged on the UHPC concrete surface of a wet joint, the steam curing process is carried out, the temperature is measured through a temperature sensor arranged in the steam curing heat preservation shed, the steam quantity is regulated and controlled according to measured data, and the steam curing temperature and the steam curing humidity are guaranteed to meet the steam curing requirement.
Further, when the UHPC precast slabs are lifted, a lifting frame is firstly placed on the UHPC precast slabs, the bottom surfaces of the lifting frames are attached to the upper planes of the UHPC precast slabs, the lifting point positions on the lifting frames are aligned to lifting connecting pieces pre-embedded in the UHPC precast slabs, a plurality of lifting points are arranged on the lifting frames at intervals to ensure that the UHPC precast slabs are balanced in stress, cross arms are arranged at the lifting point positions on the lifting frames, two ends of each cross arm are respectively and tightly connected with the lifting connecting pieces pre-embedded in the UHPC precast slabs through connecting rods, the lifting frames and the UHPC are connected into a whole, lifting hooks on tower cranes/gantry cranes are connected with lifting lugs arranged at the upper ends of the lifting frames through lifting ropes, and therefore the UHPC precast slabs are.
The invention has the beneficial effects that:
(1) by arranging the steel bar group at the wet joint and casting UHPC concrete in situ, after the UHPC concrete reaches the strength, the two adjacent UHPC precast slab embedded steel bars transmit the tensile force to the longitudinal connecting steel bars through the UHPC concrete, and under the welding-free condition, the UHPC concrete of the wet joint becomes an effective connecting part of a stressed whole, thereby greatly improving the local rigidity of the bridge deck, leading the stress of a bridge deck pavement layer to be uniform and reducing the cracking risk of the asphalt concrete;
(2) when the UHPC precast slabs are hoisted, the hoisting frames are tightly attached to the UHPC precast slabs and then are tightly connected with the UHPC precast slabs, so that the hoisting frames are connected with the UHPC precast slabs into a whole, and a lifting hook on a tower crane/gantry crane is connected with the hoisting frames through a hoisting rope, thereby realizing the hoisting of the UHPC precast slabs;
(3) the installation and construction process of the UHPC precast slab on the bridge floor of the suspension bridge has the advantages of scientific and reasonable design, convenient construction, safe and reliable operation, ordered field management and guarantee of the engineering quality, and the construction efficiency is greatly improved, and the construction speed is accelerated.
Drawings
FIG. 1 is a design drawing of the construction layout of a bridge deck of a suspension bridge using the construction process of the present invention.
Fig. 2 is a schematic top view of fig. 1.
Fig. 3 is a partially enlarged view of a portion a in fig. 2.
FIG. 4 is a schematic view showing the structure of the position of the wet joint between adjacent UHPC prefabricated panels.
FIG. 5 is a schematic isometric view of the location of the wet joint between adjacent UHPC preformed sheets.
Fig. 6 is a schematic view of a wet joint after completion of UHPC concrete casting.
FIG. 7 is a schematic diagram of the hoisting of a UHPC precast slab.
Fig. 8 is a schematic view of the UHPC prefabricated panel in combination with a hanger.
Fig. 9 is a partial enlarged view of fig. 8 at B.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Referring to fig. 1 to 9, the installation and anchoring process of the suspension bridge deck UHPC precast slab of the embodiment includes:
(1) and (3) installation of the UHPC prefabricated plate: as shown in fig. 1 to 3, a transportation flat car track 8 and a gantry crane track are laid on a main girder truss formed by a main longitudinal girder 6, a small longitudinal girder 5 and a cross beam, one steel rail in the transportation flat car track 8 is positioned on the main longitudinal girder 6, the other steel rail is positioned on the small longitudinal girder 5 adjacent to the main longitudinal girder 6, and the gantry crane track 7 is positioned on the main longitudinal girder 6 at two sides of the steel rail laying and is positioned outside the transportation flat car track 8; a plurality of transport flat trucks 2 used for loading and transporting UHPC precast slabs 4 are arranged on a transport flat truck rail 8, a gantry crane 3 is arranged on a gantry crane rail 7, the UHPC precast slabs 4 are lifted to the transport flat trucks 2 by a tower crane 1 and then transported to a preset position by the transport flat trucks 2, the gantry crane 3 lifts the UHPC precast slabs 4 from the transport flat trucks 2 to an installation position, so that two short edges of the UHPC precast slabs 4 are respectively lapped on a main longitudinal beam 6 and a small longitudinal beam 5 or two adjacent small longitudinal beams 5, two long edges of the UHPC precast slabs 4 are lapped on two adjacent cross beams, wet joints are formed between two adjacent UHPC precast slabs 4 and support beam plates 9 at the upper ends of the main longitudinal beam/the small longitudinal beams/the cross beams, and thus the installation of all the UHPC precast slabs is completed circularly; as shown in fig. 7-9, when the UHPC prefabricated slab 4 is hoisted, the hanger 15 is firstly placed on the UHPC prefabricated slab 4, the bottom surface of the hanger 15 is tightly attached to the upper plane of the UHPC prefabricated slab 4, and the positions of the hoisting points on the hanger 15 are aligned with the hoisting connecting pieces pre-embedded in the UHPC prefabricated slab, a plurality of hoisting points are arranged on the hanger 15 at intervals to ensure that the stress of the UHPC prefabricated slab is balanced, a cross arm 18 is arranged on the positions of the hoisting points on the hanger 15, two ends of the cross arm 18 are respectively and tightly connected with the hoisting connecting pieces pre-embedded in the UHPC prefabricated slab 4 through connecting rods 19, so that the hanger 15 and the UHPC prefabricated slab 4 are connected into a whole, and a lifting hook on a tower crane/gantry crane is connected with a lifting lug 16 arranged at the upper end of the hanger 15 through;
(2) coating a vulcanized rubber sealant on the contact part of the periphery of the bottom of the UHPC precast slab 4 and the supporting beam slab 9 for waterproof treatment;
(3) wet seam placement: as shown in fig. 4, 5 and 6, adjacent sides of two UHPC prefabricated panels 4 are lapped on the same supporting beam plate 9, a gap of 10-60 cm is arranged between the two UHPC prefabricated panels 4, the joint end 41 of the UHPC prefabricated panel 4 is step-shaped, the joint end 41 of the step-shaped UHPC prefabricated panel on two sides and the supporting beam plate 9 jointly form a T-shaped special-shaped joint space 11, one or more rows of vertical studs 10 are welded on the supporting beam plate, an overhanging steel bar extending out of the UHPC prefabricated panel is embedded in the UHPC prefabricated panel 4, the overhanging steel bar comprises more than two upper-layer joint embedded steel bars 42 and more than two lower-layer joint embedded steel bars 43, the upper-layer joint embedded steel bars 42 and the lower-layer joint embedded steel bars 43 both extend out into the T-shaped special-shaped joint space 11, the positions of the upper-layer joint embedded steel bars 42 of the two adjacent UHPC prefabricated panels 4 are corresponding to each other, and the positions, the upper seam embedded steel bars 42 are positioned on the upper end face of the step at the seam joint end 41 and are partially wrapped by the UHPC concrete of the boss, so that a tooth socket structure is formed on the step face, the tooth socket structure, the seam joint end and the UHPC precast slab are integrally formed by one-step prefabrication, longitudinal reinforcing steel bars 13 consistent with the direction of the external reinforcing steel bars of the UHPC precast slab 4 and transverse reinforcing steel bars 12 vertically crossed with the longitudinal reinforcing steel bars 13 are distributed in the T-shaped special-shaped seam space 11, the longitudinal reinforcing steel bars 13 and the external reinforcing steel bars of the UHPC precast slab are arranged in parallel at intervals without welding and fixation;
(4) wet joint cast-in-place UHPC concrete: laying a cast-in-situ UHPC concrete movable mixing station at the bridge head of a main bridge, adding water to a dry mixed material of the UHPC concrete for mixing, conveying a wet UHPC concrete material to a wet joint by adopting a small dump truck, paving a conveying channel and an empty truck return channel for the dump truck to pass through on two sides of a bridge floor by adopting steel plates or wood plates, pouring the wet joint by adopting artificial cloth, vibrating the surface of the wet joint by adopting a flat plate vibrator immediately, vibrating and compacting the UHPC concrete, leveling the plane of the wet joint by adopting a light vibrating and leveling machine, and connecting overhanging reinforcing steel bars of two adjacent UHPC precast slabs into a stressed whole by using the cast-in-situ UHPC concrete of the wet joint without welding and anchoring;
(5) moisture preservation and maintenance of wet joints: spraying water at the wet joint, covering the wet joint with a polymer water-retaining health-preserving film, watering and preserving the moisture, wherein the moisture-retaining maintenance time is 48 hours;
(6) and (3) performing high-temperature steam curing on the wet joint: set up steam health preserving heat preservation canopy system, let in steam and carry out high temperature to wet seam and evaporate fostering, steam health preserving heat preservation canopy adopts the longitudinal segment mode to go on, every section evaporates fostering and includes longitudinal wet seam and horizontal wet seam, coverage exceeds segmentation seam 0.5m at least, steam passes through steam conduit and gets into steam health preserving heat preservation canopy, steam conduit in steam health preserving heat preservation canopy evenly arranges on the UHPC concrete face of wet seam, evaporate fostering in-process, measure the temperature through the temperature sensor who sets up in steam health preserving heat preservation canopy, carry out the regulation and control of steam volume according to measured data, guarantee to evaporate fostering temperature and humidity and satisfy and evaporate fostering the requirement. The requirements of high-temperature steam curing are as follows: the temperature is raised to 63-68 ℃ at a temperature-raising speed of not more than 12 ℃/h in the temperature-raising stage, the temperature is kept constant at 63-68 ℃ for not less than 72 hours in the constant-temperature stage, and the temperature is lowered to the normal temperature at a temperature-lowering speed of not more than 10 ℃/h in the temperature-lowering stage. And (4) completing the welding-free anchoring of the bridge deck UHPC precast slab and the girder truss after the steam curing is completed. After the wet joint UHPC concrete 14 (shown in figure 5) reaches the strength, the embedded steel bars of two adjacent UHPC precast slabs transmit tensile force to the longitudinal connecting steel bars through the UHPC concrete, under the welding-free condition, the wet joint becomes an effective connecting part of a stressed whole, and the girder truss and the UHPC bridge deck slab form a rigid system to meet the complex stress requirement of the girder truss.
In this embodiment, the transportation flatbed adopts battery power to realize the operation by remote operation control terminal. And the track gauge of the transport flat car is more than or equal to the maximum size of the UHPC precast slab during transportation.
Many modifications and other embodiments of the invention will come to mind to one skilled in the art to which this invention pertains having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the inventions are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A suspension bridge deck UHPC precast slab installation anchor technology which is characterized by comprising:
(1) and (3) installation of the UHPC prefabricated plate: the method comprises the following steps that a transportation flat car track and a gantry crane track are arranged on a main beam truss consisting of main longitudinal beams, small longitudinal beams and cross beams, a plurality of transportation flat cars for loading and transporting UHPC precast slabs are arranged on the transportation flat car track, a gantry crane is arranged on the gantry crane track, the UHPC precast slabs are hoisted to the transportation flat cars by tower cranes and then transported to preset positions by the transportation flat cars, the UHPC precast slabs are hoisted to installation positions by the gantry cranes from the transportation flat cars, so that two short edges of the UHPC precast slabs are respectively lapped on the main longitudinal beams and the small longitudinal beams or two adjacent small longitudinal beams, two long edges of the UHPC precast slabs are lapped on the two adjacent cross beams, wet joints are formed between the two adjacent UHPC precast slabs and supporting beam plates at the upper ends of the main longitudinal beams, the small longitudinal beams and the cross beams, and the installation of all the UHPC precast slabs is;
(2) coating a vulcanized rubber sealant on the contact part of the periphery of the bottom of the UHPC precast slab and the supporting beam slab for waterproof treatment;
(3) wet seam placement: the adjacent sides of two UHPC precast slabs are lapped on the same supporting beam slab, a gap of 10-60 cm is arranged between the two UHPC precast slabs, the joint end of the UHPC precast slab is step-shaped, the joint end of the step-shaped UHPC precast slabs at two sides and the supporting beam slab jointly form a T-shaped special-shaped joint space, one row or more than one row of vertical studs are welded on the supporting beam slab, overhanging steel bars extending out of the UHPC precast slabs are embedded in the UHPC precast slabs and comprise more than two upper-layer joint embedded steel bars and more than two lower-layer joint embedded steel bars, the upper-layer joint embedded steel bars and the lower-layer joint embedded steel bars extend into the T-shaped special-shaped joint space, the upper-layer joint embedded steel bars of the two adjacent UHPC precast slabs correspond to each other in position, the lower-layer joint embedded steel bars also correspond to each other in position, the upper-layer joint embedded steel bars are positioned on the upper end surface of the step of the joint end, the tooth socket structure, the joint end and the UHPC prefabricated plate are a whole formed by one-step prefabrication, longitudinal reinforcing steel bars and transverse reinforcing steel bars are distributed in the T-shaped special-shaped joint space, the longitudinal reinforcing steel bars and the transverse reinforcing steel bars are consistent in direction of the extending reinforcing steel bars of the UHPC prefabricated plate, the transverse reinforcing steel bars and the extending reinforcing steel bars of the UHPC prefabricated plate are vertically crossed, and the longitudinal reinforcing steel bars and the extending reinforcing steel bars of the UHPC prefabricated plate are arranged in;
(4) wet joint cast-in-place UHPC concrete: conveying a wet UHPC concrete material to a wet joint to finish the pouring of the wet joint, immediately vibrating the surface of the wet joint by using a flat plate vibrator, vibrating the UHPC concrete to be compact, leveling the plane of the wet joint by using a light vibrating leveling machine, and connecting the overhanging steel bars of two adjacent UHPC precast slabs into a stressed whole by pouring the UHPC concrete in situ of the wet joint;
(5) moisture preservation and maintenance of wet joints: spraying water at the wet joint, covering the wet joint with a polymer water-retaining health-preserving film, watering and preserving the moisture, wherein the moisture-retaining maintenance time is 48 hours;
(6) and (3) performing high-temperature steam curing on the wet joint: and (3) building a steam curing heat preservation shed system, introducing steam to carry out high-temperature steam curing on the wet joint, and completing the weldless anchoring of the bridge deck UHPC precast slab and the girder truss after the steam curing is finished.
2. The mounting and anchoring process of the UHPC precast slab for the bridge deck of the suspension bridge as claimed in claim 1, wherein: one steel rail in the transportation flat car track is positioned on the main longitudinal beam, the other steel rail is positioned on the small longitudinal beam adjacent to the main longitudinal beam, and the steel rails of the gantry crane track are arranged on the main longitudinal beams on two sides and positioned outside the transportation flat car track.
3. The mounting and anchoring process of the UHPC precast slab for the bridge deck of the suspension bridge as claimed in claim 1, wherein: and the track gauge of the transport flat car is more than or equal to the maximum size of the UHPC precast slab during transportation.
4. The mounting and anchoring process of the UHPC precast slab for the bridge deck of the suspension bridge as claimed in claim 1, wherein: the transportation flat car is powered by a storage battery, and the operation and control are realized by a remote operation control terminal.
5. The mounting and anchoring process of the UHPC precast slab for the bridge deck of the suspension bridge as claimed in claim 1, wherein: UHPC concrete is stirred on site, a movable UHPC concrete stirring station for cast-in-situ is arranged at the bridge head of the main bridge, and the UHPC concrete dry mixture is stirred on site by adding water.
6. The mounting and anchoring process of the UHPC precast slab for the bridge deck of the suspension bridge as claimed in claim 1, wherein: the UHPC concrete wet material is transported by a small dump truck, and a transport channel and an empty truck return channel for the dump truck to pass through are laid on two sides of the bridge floor by steel plates or wood plates.
7. The mounting and anchoring process of the UHPC precast slab for the bridge deck of the suspension bridge as claimed in claim 1, wherein: the conditions of high-temperature steam curing are as follows: the temperature is raised to 63-68 ℃ at a temperature-raising speed of not more than 12 ℃/h in the temperature-raising stage, the temperature is kept constant at 63-68 ℃ for not less than 72h in the constant-temperature stage, and the temperature is lowered to the normal temperature at a temperature-lowering speed of not more than 10 ℃/h in the temperature-lowering stage.
8. The mounting and anchoring process of the UHPC precast slab for the bridge deck of the suspension bridge as claimed in claim 1, wherein: the steam curing heat preservation shed is carried out in a longitudinal segmentation mode, each segment of steam curing comprises a longitudinal wet joint and a transverse wet joint, and the coverage range at least exceeds 0.5m of the segmentation joints.
9. The process for installing and anchoring a suspension bridge deck UHPC precast slab according to claim 8, characterized in that: steam enters the steam curing heat preservation shed through a steam pipeline, the steam pipeline in the steam curing heat preservation shed is uniformly arranged on the UHPC concrete surface of a wet joint, the steam curing process is carried out, the temperature is measured through a temperature sensor arranged in the steam curing heat preservation shed, the steam quantity is regulated and controlled according to measured data, and the steam curing temperature and humidity are guaranteed to meet the steam curing requirement.
10. The mounting and anchoring process of the UHPC precast slab for the bridge deck of the suspension bridge as claimed in claim 1, wherein: when the UHPC prefabricated plate is hoisted, a hoisting frame is firstly arranged on the UHPC prefabricated plate, the bottom surface of the hoisting frame is tightly attached to the upper plane of the UHPC prefabricated plate, the positions of hoisting points on the hoisting frame are aligned to hoisting connecting pieces pre-embedded in the UHPC prefabricated plate, a plurality of hoisting points are arranged on the hoisting frame at intervals to ensure that the UHPC prefabricated plate is stressed in balance, cross arms are arranged at the positions of the hoisting points on the hoisting frame, two ends of each cross arm are respectively and tightly connected with the hoisting connecting pieces pre-embedded in the UHPC prefabricated plate through connecting rods, the hoisting frame and the UHPC prefabricated plate are connected into a whole, and a lifting hook on a tower crane/gantry crane is connected with a lifting lug arranged at the upper end of the hoisting.
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| CN202110037255.5A CN112726417A (en) | 2021-01-12 | 2021-01-12 | Installation and anchoring process for UHPC precast slab of suspension bridge deck |
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| CN202110037255.5A CN112726417A (en) | 2021-01-12 | 2021-01-12 | Installation and anchoring process for UHPC precast slab of suspension bridge deck |
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