CN114775458A - Method for additionally paving UHPC (ultra high performance concrete) layer on bridge deck concrete pavement layer - Google Patents
Method for additionally paving UHPC (ultra high performance concrete) layer on bridge deck concrete pavement layer Download PDFInfo
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- CN114775458A CN114775458A CN202210266435.5A CN202210266435A CN114775458A CN 114775458 A CN114775458 A CN 114775458A CN 202210266435 A CN202210266435 A CN 202210266435A CN 114775458 A CN114775458 A CN 114775458A
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 91
- 239000004567 concrete Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- 238000004804 winding Methods 0.000 claims abstract description 9
- 238000005553 drilling Methods 0.000 claims description 20
- 239000000835 fiber Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 7
- 239000011800 void material Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 4
- 238000007788 roughening Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 7
- 230000002787 reinforcement Effects 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 80
- 238000010276 construction Methods 0.000 description 19
- 230000003014 reinforcing effect Effects 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000013011 mating Effects 0.000 description 6
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 239000011384 asphalt concrete Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling 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
- E01D19/08—Damp-proof or other insulating layers; Drainage arrangements or devices ; Bridge deck surfacings
- E01D19/083—Waterproofing of bridge decks; Other insulations for bridges, e.g. thermal ; Bridge deck surfacings
-
- 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
Abstract
The invention relates to a method for additionally paving a UHPC layer on a bridge deck concrete pavement layer, belonging to the technical field of bridge maintenance and reinforcement engineering. After the existing pavement layer is drilled, the UHPC is poured and maintained, the UHPC column in the hole is used for firmly connecting the UHPC layer with the existing bridge deck structure, so that the bonding strength between the UHPC layer and the existing bridge deck structure is improved, and the phenomenon of debonding or hollowing of the UHPC layer in the subsequent use process is avoided. The shear resistance and the pull-out resistance of the UHPC column can be further improved by making the hole be in a thin waist shape and placing a steel wire mesh winding drum in the hole. The method can avoid the traditional bar planting operation, improve the operation environment, reduce the damage to the existing structure, greatly improve the waterproofness and the corrosion resistance of the new bridge deck pavement, save the operation of completely removing the existing pavement layer and accelerate the project progress.
Description
Technical Field
The invention relates to a method for reinforcing a concrete bridge by adopting an enlarged cross section method, in particular to a method for additionally paving a UHPC layer on a bridge deck concrete pavement layer, belonging to the technical field of bridge maintenance and reinforcement engineering.
Background
In recent years, Ultra High Performance Concrete (UHPC) has been studied and applied more fully. The UHPC has the characteristics of ultrahigh compressive strength and ultrahigh breaking strength of not less than 120MPa, good volume stability, high toughness, better impermeability and the like. As a reinforcing material of the structure or the member, the rigidity of the structure or the member can be improved, the safety of the structure is improved, the durability is more than 50 years, and the service life of the structure can be greatly prolonged. Meanwhile, due to the fact that the UHPC is high in strength, the using amount of other materials can be reduced, the self weight of the structure is reduced, the construction difficulty is reduced, manpower and material resources are saved, and the construction cost is reduced.
When the bearing capacity of the existing bridge is insufficient, the method of increasing the cross section is a common method for reinforcing. Under the condition, the thickened pavement layer is often the first choice because overhead operation can be avoided and construction is convenient. The existing layer of mating formation of shovel generally during the construction, the layer of mating formation of watering the thickening again has placed double-deck reinforcing bar net in the in situ of mating formation, and this has increaseed the dead load of second phase undoubtedly, and the in situ double-deck reinforcing bar net of mating formation influences concrete placement speed and quality, and reinforcing bar protective layer or reinforcing bar layer interval are very little, trample when adding the construction and can make the bottom reinforcing bar whereabouts at girder roof upper surface, seriously influence the bonding of layer of mating formation and girder. If the existing pavement layer is well bonded with the lower main beam, the debonding phenomena such as hollowing and the like do not exist, the great waste caused by the existing pavement layer is completely eradicated, and the workload is increased. Due to the excellent performance of the UHPC, the UHPC is an ideal material for an overlay layer, and the bearing capacity of a bridge is improved, and meanwhile, the wear resistance, the water resistance, the corrosion resistance and the like are improved. At present, UHPC is expensive compared with common concrete, so that the removal of all existing pavement layers is more uneconomical. The original paving layer is reserved, and then the UHPC layer is paved to become the first choice.
When the concrete layer is paved, measures are needed to enhance the binding force of the new and old concrete binding layers. If the surface of the existing pavement layer is roughened only before new concrete is poured, the bonding force of the bonding surface is relatively weak, the additional layer is still easy to debond under the action of factors such as large impact load and the like, the phenomenon of hollowing occurs, and the additional layer is continuously developed until the additional layer cracks and is broken. In order to enhance the combination between new and old concrete, holes are drilled in the existing concrete layer, and chemical glue is used for embedding bars. Considering that the diameter of the steel bar is smaller, a pneumatic drill is usually adopted in corresponding drilling construction, the pneumatic drill vibrates greatly during drilling, fatigue damage can be caused to the existing concrete, the safety of the structure can be greatly reduced in the construction process, and the dust, vibration and noise during construction seriously influence the physical health of workers; in addition, the durability of the chemical adhesive is questionable, and if the chemical adhesive fails after years, the chemical adhesive brings safety problems to the structure, and seriously brings the disaster of structural collapse. In addition, the same concerns exist for measures to apply chemical glue as a cohesive agent to the interface.
Disclosure of Invention
In order to overcome the defects in the prior art and improve the bonding strength between the UHPC overlay layer and the existing pavement layer, a method for overlaying the UHPC layer on the bridge deck concrete pavement layer needs to be developed.
The technical scheme provided by the invention is that after drilling is carried out on the existing pavement layer, UHPC is poured and maintained, UHPC entering the hole forms an UHPC column integrated with the UHPC layer, and the UHPC layer is firmly connected with the existing bridge deck structure.
Preferably, the drilling operation adopts a hollow drill, or adopts a solid grinding drill, or adopts high-pressure water jet to form the hole.
Preferably, the radius of the hole is continuously changed along the height direction, the hole is in a thin waist shape, the radius of the bottom is larger than that of the middle of the hole, and the radius of the hole at the opening is also larger than that of the middle of the hole.
Preferably, the holes extend through the existing decking layer into the underlying slab.
Preferably, the minimum diameter of the holes is more than 40mm, and the depth of the holes is more than 40 mm.
Preferably, before drilling, a steel bar detector is adopted to determine the position and the depth of the steel bars in the existing pavement and the concrete slab below the pavement so as to determine the hole position where the steel bars can be avoided.
Preferably, said UHPC incorporates fibres, the length of which is less than the minimum radius of the pores and less than half the thickness of the UHPC layer.
Preferably, prior to drilling, the existing pavement is chiseled; after drilling, cleaning the surface of the existing pavement layer, and cleaning holes; before pouring UHPC, sprinkling water for many times on the existing pavement layer to reach saturation surface dryness, and removing accumulated water in the holes.
Preferably, a steel wire mesh winding drum made of thin steel wires is placed in the hole, the opening of the winding drum is upward, and the high end of the winding drum is 10mm lower than the upper surface of the UHPC layer.
Preferably, before drilling, exploring a void area of an existing pavement layer, and removing concrete of the pavement layer in the void area; and then, removing the concrete of the pavement layer within 50mm of each of two sides of the crack of the existing pavement layer.
The beneficial effects of the invention comprise the following aspects:
(1) the operation of removing the existing pavement layer is omitted, the material waste is avoided, the damage and the damage to the lower component in the removing process are avoided, and the project progress is accelerated;
(2) the traditional bar planting operation is avoided, the operation environment is improved, the damage to the existing structure is reduced, the construction operation environment is greatly improved, and the influence of dust, vibration and noise on the health of workers is avoided;
(3) the UHPC column formed by drilling not only can improve the shear strength between the UHPC layer and the existing pavement layer, but also has high resistance to pulling, and effectively enhances the bonding strength between the UHPC layer and the existing pavement layer;
(4) the anti-pulling capacity of the UHPC column can be further improved by making the hole be in a thin waist shape and placing a steel wire mesh winding drum in the hole;
(5) the UHPC column can also firmly connect a newly poured UHPC layer, the existing pavement layer and the girder top plate into a whole by enabling the hole to penetrate through the existing pavement layer and extend into the concrete plate below, so that the bonding strength between the original pavement layer and the girder top plate is further improved, namely the bonding strength between the newly paved layer and the girder top plate is improved;
(6) when the hollow drill is adopted for drilling, the strength of the UHPC column is not reduced by reserving the old concrete column at the bottom, the using amount of the UHPC is reduced, the construction is simplified, and the construction progress is accelerated;
(7) by reserving the old concrete column with the convex top in the hole after drilling, in the process of pouring the UHPC, the direction of the steel fiber can be automatically adjusted to be vertical in the process of flowing to the annular groove, so that the shear resistance and the pull-out resistance of the UHPC column can be improved, and the bonding capacity between the UHPC layer and the existing pavement layer can be improved;
(8) the UHPC layer is additionally paved on the existing pavement layer, so that the second-stage dead load can be reduced, a bridge deck reinforcing mesh can be omitted in construction, the convenience of bridge deck construction is improved, the construction progress can be accelerated, and the bonding performance between the pavement layer of the new bridge deck and the top plate of the main beam is ensured;
(9) the technology is suitable for the construction of overlay layers in all concrete structures, such as the thickening of a concrete box girder or a T-shaped girder web plate in a bridge, the reinforcing of a capping girder, the waterproof reinforcing of a flood discharge tunnel of a hydropower station in hydraulic engineering and the like.
Drawings
FIG. 1 is a schematic partial view of a bridge deck structure after application in example 1;
FIG. 2 is a schematic partial view of a deck structure of example 1 prior to casting of UHPC;
FIG. 3 is a partial schematic view of a structure of a UHPC front axle face poured in the embodiment 2;
FIG. 4 is a schematic partial view of a bridge deck structure after application in example 2;
FIG. 5 is a partial schematic view of a UHPC front axle face structure cast in embodiment 3;
FIG. 6 is a schematic partial view of a bridge deck structure after application in example 3;
FIG. 7 is a schematic side view of a steel wire mesh reel in example 4;
FIG. 8 is a schematic partial view of a bridge deck structure after application in example 4;
FIG. 9 is a schematic partial view of a deck structure prior to casting of UHPC in example 5;
FIG. 10 is a schematic view of a portion of the deck structure of example 5 after application;
FIG. 11 is a schematic partial view of the distribution of the fibers in UHPC in example 3.
In the figure: girder roof 1, existing layer of mating formation 2, UHPC layer 3, UHPC post 4, hole 5, old concrete column 6, wire net reel 7, steel fibre 8.
Detailed Description
Example 1
The corresponding bridge in the embodiment is a simply supported concrete box girder, the existing pavement layer is empty after running for many years, cracks appear on the lower surface of the bottom plate along with the increase of the load of a vehicle, the bearing capacity of the bridge is low, and the pavement layer is thickened by additionally paving the UHPC layer, so that the bearing capacity and the durability of the bridge are improved. The thickness of the existing pavement layer is 80mm, and the thickness of the designed UHPC layer is 40 mm. The construction comprises the following steps:
step 1: clearing the asphalt concrete surface layer, and cleaning the surface of the existing pavement layer; roughening the existing pavement layer; detecting a void area of the existing full-bridge pavement layer by using a knocking method, and removing concrete of the pavement layer in the void area; then, removing pavement layer concrete in the range of 50mm on both sides of the crack of the existing pavement layer;
step 2: referring to an original design drawing, determining the position and the depth of a steel bar in an existing pavement layer and a concrete slab below the pavement layer by using a steel bar detector, and marking by using spray paints with different colors; the method comprises the steps of (1) pushing from one end of a bridge to the other end of the bridge to determine hole positions capable of avoiding reinforcing steel bars; the hole sites are arranged in a quincunx shape, and the distance between the hole sites is less than 600 mm;
and step 3: holes are drilled in the holes by means of core drills, see fig. 1 and 2, which are partial schematic views of the construction of the front and rear deck of the cast UHPC. The nominal outer diameter of the core drill bit is 42 mm. The depth of the drilled hole 5 is 50 mm;
and 4, step 4: cleaning the surface of the existing pavement layer 2 and cleaning holes; sprinkling water for many times on the existing pavement layer 2 to reach saturation surface dryness and removing accumulated water in the holes 5; pouring UHPC to ensure that the thickness of the UHPC layer 3 meets the design requirement, and curing according to the design rule; the UHPC is doped with steel fibers, the length of the steel fibers is 20mm, and the diameter of the steel fibers is 0.3 mm;
and 5: and pouring a new asphalt concrete surface layer.
In the finished bridge deck structure, UHPC entering the holes 5 forms UHPC columns 4, and the existing pavement layer 2 and the UHPC layer 3 are firmly connected. The UHPC material has excellent characteristics, so that the UHPC column 4 has high shearing resistance and high pulling resistance.
Example 2
This embodiment is a modification of embodiment 1, see fig. 3 and 4. In this embodiment, the depth of the drilled hole is increased, and the depth of the hole 5 is 100mm, and extends into the top plate 1 of the main beam. The UHPC column 4 can firmly connect the newly poured UHPC layer 3 with the existing pavement layer 2 and the girder top plate 1 into a whole, so that the bonding strength between the existing pavement layer 2 and the girder top plate 1 is further improved, namely the bonding strength between the newly paved layer and the girder top plate 1 is improved.
Example 3
This embodiment is a modification of embodiment 1, see fig. 5 and 6. In this embodiment, after the hollow drill is used to drill to the designed depth, the hollow drill is rotated while being pulled up, the hole rod and the drill bit are withdrawn, the concrete column is left in the hole 5, and the top of the concrete column is hammered off by a hand hammer and a chisel, so that the old concrete column 6 is obtained, and the middle of the old concrete column 6 is raised. And the bottom of the UHPC column 4 obtained after pouring the UHPC is wrapped with the concrete column with the same material as that of the existing pavement layer 2. The strength of the UHPC column 4 is not reduced, the UHPC dosage is reduced, the construction is simplified, and the construction progress is accelerated. More importantly, the distribution of the steel fibers 8 in the UHPC column 4 is more beneficial to stress, and the direction of the steel fibers 8 is automatically adjusted to be vertical in the process that the UHPC flows to the annular groove of the hole 5, so that the shearing resistance and the pulling resistance of the UHPC column 4 are more beneficial to improvement.
Example 4
This embodiment is a modification of embodiment 1, see fig. 7 and 8. Inside the hole 5 a wire mesh reel 7 is placed. The steel wire mesh winding drum 7 is in the same shape as a conventional steel reinforcement cage, is made of thin steel wires and is 80mm high. The addition of the steel wire mesh winding drum 7 further enhances the shearing resistance and the pulling resistance of the UHPC column 4.
Example 5
This embodiment is a modification of embodiment 1, see fig. 9 and 10. During drilling, a solid grinding drill is adopted, and a drill bit of the drill is a brazed diamond mushroom. After vertically drilling to a specified depth, lifting the drill bit, and reaming the upper part of the hole; the hole is then drilled into the bottom of the hole and the drill stem is rotated to ream the hole to the bottom, thus creating the hole 5 as shown in figure 9. The radius of the holes 5 along the height direction is continuously changed, and the holes are in a thin waist shape. After UHPC is poured, the occlusion of the UHPC columns 4 can greatly increase the uplift resistance and prevent the new bridge deck pavement layer from debonding.
Example 6
This embodiment is a modification of embodiment 5. The shaping of the holes 5 of example 5 was modified in view of the fact that solid abrasive drills are relatively time consuming and wear on the drill bit is high during the entire drilling process. The hole 5 shown in fig. 9 can also be obtained by combining a core drill and an abrasive drill, specifically, making the hole 5 with a vertical hole wall as shown in fig. 2 by using the core drill according to the method described in example 1, modifying the hole opening section by using the abrasive drill according to the method described in example 5, and then modifying the hole bottom section by using the method described in example 5.
Claims (10)
1. A method for additionally paving a UHPC layer on a bridge deck concrete pavement layer is characterized by comprising the following steps: and drilling holes on the existing pavement layer, pouring UHPC and maintaining, then forming UHPC columns integrated with the UHPC layer by the UHPC entering the holes, and firmly connecting the UHPC layer with the existing bridge deck structure.
2. The method for paving the UHPC layer on the bridge deck concrete pavement layer according to claim 1, wherein the method comprises the following steps: the drilling operation adopts a hollow drill, or adopts a solid grinding drill, or adopts high-pressure water jet to form a hole.
3. The method for paving the UHPC layer on the bridge deck concrete pavement layer according to claim 1, wherein the method comprises the following steps: the radius of the hole is continuously changed along the height direction, the hole is in a thin waist shape, the radius of the bottom is larger than that of the middle of the hole, and the radius of the hole opening is also larger than that of the middle of the hole.
4. The method for additionally paving the UHPC layer on the bridge deck concrete pavement layer according to claim 1, characterized in that: the holes penetrate through the existing pavement layer and extend into the concrete slab below the holes.
5. The method for additionally paving the UHPC layer on the bridge deck concrete pavement layer according to claim 1, characterized in that: the minimum diameter of the hole is larger than 40mm, and the depth of the hole is larger than 40 mm.
6. The method for additionally paving the UHPC layer on the bridge deck concrete pavement layer according to claim 1, characterized in that: before drilling, a steel bar detector is adopted to determine the position and the depth of the steel bars in the existing pavement layer and the concrete slab below the pavement layer so as to determine the hole position capable of avoiding the steel bars.
7. The method for paving the UHPC layer on the bridge deck concrete pavement layer according to claim 1, wherein the method comprises the following steps: the UHPC is doped with fibers, and the length of the fibers is less than the minimum radius of the holes and less than half of the thickness of the UHPC layer.
8. The method for additionally paving the UHPC layer on the bridge deck concrete pavement layer according to claim 1, characterized in that: before drilling, roughening the existing pavement layer; after drilling, cleaning the surface of the existing pavement layer, and cleaning holes; before pouring UHPC, sprinkling water for many times on the existing pavement layer to reach saturation surface dryness, and removing accumulated water in the holes.
9. The method for paving the UHPC layer on the bridge deck concrete pavement layer according to claim 1, wherein the method comprises the following steps: a steel wire mesh winding drum made of thin steel wires is placed in the hole, a drum opening is upward, and the high end of the steel wire mesh winding drum is 10mm lower than the upper surface of the UHPC layer.
10. The method for paving the UHPC layer on the bridge deck concrete pavement layer according to claim 1, wherein the method comprises the following steps: before drilling, exploring a void area of an existing pavement layer, and removing concrete of the pavement layer in the void area; and then, removing the concrete of the pavement layer within 50mm of each of two sides of the crack of the existing pavement layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210266435.5A CN114775458B (en) | 2022-03-17 | 2022-03-17 | Method for additionally paving UHPC layer on bridge deck concrete pavement layer |
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| CN202210266435.5A CN114775458B (en) | 2022-03-17 | 2022-03-17 | Method for additionally paving UHPC layer on bridge deck concrete pavement layer |
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| CN114775458B CN114775458B (en) | 2024-04-26 |
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| CN114775458B (en) | 2024-04-26 |
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