CN114592398A - Color composite concrete pavement and construction process thereof - Google Patents
Color composite concrete pavement and construction process thereof Download PDFInfo
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- CN114592398A CN114592398A CN202210251705.5A CN202210251705A CN114592398A CN 114592398 A CN114592398 A CN 114592398A CN 202210251705 A CN202210251705 A CN 202210251705A CN 114592398 A CN114592398 A CN 114592398A
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- 238000010276 construction Methods 0.000 title claims abstract description 48
- 239000002131 composite material Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000010410 layer Substances 0.000 claims abstract description 130
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 47
- 239000004576 sand Substances 0.000 claims abstract description 37
- 239000010426 asphalt Substances 0.000 claims abstract description 35
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 13
- 239000011241 protective layer Substances 0.000 claims abstract description 11
- 239000004568 cement Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 42
- 229910000831 Steel Inorganic materials 0.000 claims description 23
- 239000010959 steel Substances 0.000 claims description 23
- 238000003892 spreading Methods 0.000 claims description 19
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000003825 pressing Methods 0.000 claims description 8
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/02—Arrangement or construction of joints; Methods of making joints; Packing for joints
- E01C11/04—Arrangement or construction of joints; Methods of making joints; Packing for joints for cement concrete paving
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/02—Arrangement or construction of joints; Methods of making joints; Packing for joints
- E01C11/04—Arrangement or construction of joints; Methods of making joints; Packing for joints for cement concrete paving
- E01C11/06—Methods of making joints
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/02—Arrangement or construction of joints; Methods of making joints; Packing for joints
- E01C11/04—Arrangement or construction of joints; Methods of making joints; Packing for joints for cement concrete paving
- E01C11/14—Dowel assembly ; Design or construction of reinforcements in the area of joints
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The colored composite concrete pavement comprises a road base layer, a cement stabilized macadam base layer, an asphalt sand cushion layer and a concrete road surface layer; the concrete pavement layer is composed of a common concrete layer and a colorful concrete layer; reinforcing meshes for reinforcing are uniformly distributed in the common concrete layer, and adjacent pavement units are separated by longitudinal and transverse expansion joints; and a transverse dowel bar and a longitudinal dowel bar are arranged between the pavement units. The construction process comprises the following steps: a) constructing a base layer; b) constructing the asphalt sand cushion; c) construction of a common concrete layer; d) constructing a colorful concrete layer; e) constructing a carborundum color protective layer; f) constructing an expansion joint; g) filling the gaps. The colored composite concrete pavement is provided with the longitudinal expansion joints and the transverse expansion joints, the expansion space is reserved for expansion with heat and contraction with cold of the pavement units, and the dowel bars are arranged, so that the pavement units are integrated, and the bearing capacity of the concrete pavement is improved.
Description
Technical Field
The invention relates to a concrete pavement and a construction process thereof, in particular to a colorful composite concrete pavement and a construction process thereof.
Background
The traffic industry of China is rapidly developed, and the cement concrete pavement is widely applied. However, concrete always appears in the visual field of people in the form of single color and grey and cool color. With the progress of modern society and the increasing quality of people's life, people have not only satisfied the practicality of the material environment, but also paid more attention to the pursuit of the artistic visual effect. On the basis, a novel pavement structure of a colorful composite concrete pavement is provided.
Different from asphalt pavement, the concrete pavement has high rigidity and strong load spreading capacity, can expand with heat and contract with cold in low-temperature winter and high-temperature summer, and needs to be cut into blocks to reserve gaps with expansion with heat and contraction with cold in order to avoid cracking of the concrete due to deformation, so that the concrete pavement is ensured to have longer service life to the maximum extent. However, in the actual application process, if the concrete road surface after being cut into pieces bears the load alone, stress concentration at the expansion joint is easily caused, the expansion joint is cracked in advance, and the service life of the concrete road is not ensured.
Disclosure of Invention
The invention provides a colored composite concrete pavement and a construction process thereof in order to overcome the defects of the technical problems.
The colorful composite concrete pavement comprises a road base layer, a cement stabilized macadam base layer, an asphalt sand cushion layer and a concrete pavement layer which are sequentially arranged from bottom to top; the method is characterized in that: the concrete pavement layer is composed of a common concrete layer positioned below and a colorful concrete layer positioned above; reinforcing meshes for reinforcing are uniformly distributed in the common concrete layer, the common concrete layer and the colorful concrete layer corresponding to each reinforcing mesh form a pavement unit, and the adjacent pavement units are separated by a longitudinal expansion joint and a transverse expansion joint which penetrate through the colorful concrete layer and penetrate into the upper part of the common concrete layer; transverse dowel bars for realizing firm connection of two left and right adjacent pavement units are uniformly distributed in a common concrete layer below the longitudinal expansion joint, and longitudinal dowel bars for realizing firm connection of two front and back adjacent pavement units are uniformly distributed below the transverse expansion joint.
According to the colored composite concrete pavement, the longitudinal expansion joints and the transverse expansion joints are both positioned below the reinforcing mesh, and the reinforcing mesh is positioned at the 2/3 height position of the common concrete layer.
According to the colored composite concrete pavement, the road base layer and the cement stabilized macadam base layer are made of semi-rigid materials, and the color of colored concrete adopted in the colored concrete layer is red, yellow, blue or green; the thickness of the common concrete layer is 12-25 cm, and the thickness of the colorful concrete layer is 3-6 cm.
According to the colored composite concrete pavement, the common concrete layers of the two adjacent road units are respectively provided with the trapezoidal front support and the trapezoidal rear support, and the front support and the rear support are respectively fixed with the supporting steel bars for supporting the front end and the rear end of the longitudinal dowel bar.
According to the colored composite concrete pavement, the outer surfaces of the transverse dowel bars below the longitudinal expansion joints and the outer surfaces of the longitudinal dowel bars below the longitudinal expansion joints are coated with antirust coatings.
According to the colored composite concrete pavement, the transverse length and the longitudinal length of the reinforcing mesh along the road are respectively 5.0m and 4.5m, the distance between the two reinforcing meshes adjacent to each other on the left and the right is 25cm, and the distance between the two reinforcing meshes adjacent to each other on the front and the back is 30 cm.
According to the colored composite concrete pavement, the carborundum colored protective layer is laid above the colored concrete layer.
The construction process of the colored composite concrete pavement is characterized by comprising the following steps of:
a) constructing a base course, namely paving a roadbed and a cement stabilized macadam base in sequence by using a semi-rigid material by adopting a conventional construction method;
b) constructing a bituminous sand cushion, namely paving the bituminous sand cushion by taking emulsified asphalt and bituminous sand as raw materials;
c) the construction of the common concrete layer is carried out according to the following steps in sequence:
c-1) installing a template, namely installing a steel template around each pavement unit according to the size of the pavement unit;
c-2) installing the reinforcing mesh, namely placing the reinforcing mesh between the templates according to the height position of the reinforcing mesh in the common concrete layer;
c-3), installing dowel bars, installing transverse dowel bars with preset height and preset distance at the left side and the right side of the pavement unit to be poured, and positioning the transverse dowel bars by adopting a mode of reserving holes on templates at the left side and the right side of the pavement unit; then, a rear support is arranged at the front part of the pavement unit, a front support is arranged at the rear part of the pavement unit in front of the pavement unit adjacent to the current pavement unit, transverse supporting steel bars are fixed on the front support and the rear support, and longitudinal dowel bars are arranged on the supporting steel bars at equal intervals;
c-4), paving and vibrating, namely firstly sprinkling water to the roadbed, then pouring and paving concrete, vibrating the concrete by using a vibrating rod after the roadbed is paved to be approximately flat to enable the concrete to be compact, and manually leveling during vibrating;
d) constructing a colored concrete layer, namely paving colored concrete before the initial setting of a common concrete layer, paving the colored concrete mixed by a mixing station to the elevation position of the road surface at one time, and vibrating the concrete by using a vibrating rod after the colored concrete is approximately leveled to make the concrete compact; manual leveling is used for vibration;
e) before the colored concrete layer is initially set, arranging a layer of colored carborundum protective layer made of wear-resistant materials on the surface of the colored concrete layer;
f) constructing the expansion joint, wherein the longitudinal expansion joint is formed in the construction process of the pavement unit, and the longitudinal expansion joint is formed after the concrete in the common concrete layer and the colorful concrete layer is initially set and is pulled out; the transverse expansion joint is formed by sawing and cutting by a sawing and sewing machine after the concrete is hardened;
g) filling gaps, namely cleaning impurities in the gaps when sealing the longitudinal expansion joints and the transverse expansion joints, and then sealing the gaps by using asphalt rubber sealing materials; the packing material is filled.
The construction process of the colored composite concrete pavement of the invention is realized by the following steps of the asphalt sand cushion layer construction of the step b):
b-1), spreading emulsified asphalt, and constructing an asphalt sand cushion layer after the roadbed is qualified; spreading the prepared emulsified asphalt with sprayer to the bottom at 0.7L/m2So as to be beneficial to combining and compacting;
b-2) paving asphalt sand, conveying the asphalt sand to a construction site, then unloading the asphalt mixture into a forklift in batches, loading the material into the paver by the forklift, and starting the paver to start paving construction when the material is filled into a hopper 2/3; the continuous forward movement of the paver is ensured, the speed of the paver is controlled to be 0.5-1.0 m/min at the beginning, and the normal traveling speed is controlled to be 1.0-2.0 m/min;
b-3), rolling, namely immediately performing compaction operation after paving the bituminous sand mixture, wherein the compaction principle is 'close following and slow pressing', otherwise, interlayer separation is easily caused, and the bituminous sand cannot be fully combined with the bridge floor; the roller is closely followed by the paver, and the steel wheel roller is firstly used for static pressure 2 times, and then the tyre roller is used for re-pressing twice.
The construction process of the colored composite concrete pavement of the invention is realized by the following steps of the construction of the carborundum colored protective layer in the step e):
e-1) removing floating slurry, and uniformly removing a floating slurry layer on the surface of the colored concrete layer by using a mechanical trowel with a disc;
e-2), spreading materials, namely uniformly spreading 2/3 wear-resistant materials with specified dosage on the surface of the concrete in the initial setting stage to finish the first spreading operation, and after the wear-resistant materials absorb moisture, performing mechanical troweling operation of a loading disc; secondly, after the wear-resistant material is hardened to a certain stage, a second material spreading operation of 1/3 specified dosage of wear-resistant material is carried out;
e-3), carrying out disc slurry extracting operation, and carrying out at least secondary disc loading and slurry extracting operation after the wear-resistant material absorbs moisture; the mechanical trowel operation should be carried out in a staggered way;
e-4) mechanical trowel operation, performing at least three times of mechanical trowel operation without adding a disc; the change of the running speed of the mechanical trowel and the angle of the mechanical trowel can be adjusted according to the hardening condition of the concrete floor; the mechanical troweling operation should be carried out in a staggered way;
e-5), curing, namely curing the surface of the color carborundum protective layer by using a wear-resistant material curing agent when the water on the surface disappears, wherein the curing agent can effectively inhibit the water evaporation, and the curing time is 7 days.
The invention has the beneficial effects that: according to the colored composite concrete pavement, the reinforcing mesh is arranged in the common concrete layer in each pavement unit, and the combination of the concrete and the reinforcing mesh effectively increases the bending and pulling resistance and the load resistance of the formed concrete pavement, and effectively prolongs the service life of the concrete pavement; the longitudinal expansion joints and the transverse expansion joints are arranged between the adjacent pavement units, so that expansion spaces are reserved for expansion with heat and contraction with cold of the pavement units, and meanwhile, the transverse dowel bars and the longitudinal dowel bars which are arranged at intervals are arranged in the common concrete layer below the longitudinal expansion joints and the transverse expansion joints, so that the pavement units are integrated, and the bearing capacity of the concrete pavement is improved.
The construction process of the colored composite concrete pavement is sequentially completed by base layer construction, asphalt sand cushion layer construction, common concrete layer construction, colored concrete layer construction, carborundum colored protective layer construction, expansion joint construction and joint filling, and ensures that the formed colored concrete pavement has the advantage of durability.
Drawings
FIG. 1 is a schematic structural view of a colored composite concrete pavement according to the present invention;
FIG. 2 is a schematic view of a pavement unit according to the present invention;
FIG. 3 is a schematic diagram of the arrangement of longitudinal expansion joints in the present invention;
FIG. 4 is a schematic diagram of the arrangement of the lateral expansion joints in the present invention;
fig. 5 is a schematic structural view of the support bar according to the present invention.
In the figure: 1, 2, cement stabilized macadam base course, 3, asphalt sand cushion, 4 common concrete layer and 5 color concrete layer; 6 reinforcing meshes, 7 pavement units, 8 left reinforcing meshes, 9 right reinforcing meshes, 10 transverse dowel bars, 11 antirust coatings, 12 longitudinal expansion joints, 13 front reinforcing meshes, 14 rear reinforcing meshes, 15 rear supports, 16 front supports, 17 longitudinal dowel bars, 18 transverse expansion joints, 19 supporting reinforcements and 20I-shaped reinforcements. Note: the dimensions in the figure are in cm.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1, a structural schematic diagram of the colored composite concrete pavement of the invention is given, which sequentially comprises a road base layer 1, a cement-stabilized macadam base layer 2, an asphalt sand cushion layer 3, a common concrete layer 4 and a colored concrete layer 5 from bottom to top, wherein the road base layer 1 and the cement-stabilized macadam base layer 2 are made of semi-rigid materials, and a layer of asphalt sand with the thickness of 2-3 cm is laid between the cement-stabilized macadam base layer 2 and the common concrete layer 4 to form the asphalt sand cushion layer 3. The common concrete layer 4 and the color concrete layer 5 are made of C40 strength concrete, the total thickness is 18-28cm, and the thickness range of the color concrete layer 5 is 3-6 cm.
The concrete pavement is composed of pavement units 7, a reinforcing mesh 6 is arranged in a common concrete layer 4 in each unit pavement unit 7, and the reinforcing mesh 6 is laid before concrete pouring so as to be formed by one-step pouring. As shown in fig. 2, which shows a schematic structural view of the pavement unit of the present invention, the reinforcing mat 6 is laid in the general concrete layer 4 to play a role of resisting bending tension, and the reinforcing mat 6 shown in fig. 2 has a size of 5m × 4.5m, which is disposed at a depth of 1/3 below the top surface of the general concrete layer 4.
As shown in fig. 3, a schematic diagram of the arrangement of longitudinal expansion joints in the present invention is shown, wherein longitudinal expansion joints 12 are provided between the left and right adjacent pavement units 7 (such as the pavement unit where the left reinforcing mat 8 is located and the pavement unit where the right reinforcing mat 9 is located in fig. 3), and the longitudinal expansion joints 12 penetrate through the colored concrete layer 5 and extend into the upper part of the common concrete layer 4. The transverse dowel bars 10 are arranged below the longitudinal expansion joints 12 and are distributed at even intervals, so that the transverse dowel bars 10 are equivalent to be positioned in the common concrete layers 4 of the two left and right adjacent pavement units 7, and the effective connection of the left and right adjacent pavement units 7 is realized. Because cracks may occur between two adjacent pavement units 7 at the left and right below the longitudinal expansion joint 12, moisture may enter after the cracks occur, and in order to guarantee the service life of the transverse dowel bar 10, the middle part of the transverse dowel bar 10 is provided with an antirust coating 11.
As shown in fig. 4, a schematic diagram of the arrangement of the transverse expansion joints in the present invention is shown, transverse expansion joints 18 are provided between the front and rear adjacent pavement units 7 (such as the pavement unit where the front reinforcing mat 13 is located and the pavement unit where the rear reinforcing mat 14 is located in fig. 4), and longitudinal force transfer rods 17 are provided in the common concrete layer 4 below the transverse expansion joints 18 and arranged at equal intervals, so that the longitudinal force transfer rods 17 equivalently extend into the front and rear adjacent pavement units 7, thereby achieving effective connection of the front and rear adjacent pavement units 7. In order to achieve positioning of the longitudinal force transfer rods 17, the longitudinal force transfer rods 17 are shown supported by a front carrier 16 and a rear carrier 15, since they are cast during the concrete road pavement.
As shown in fig. 5, a schematic structural diagram of the support bars in the present invention is shown, wherein the front support 16 and the rear support 15 are both formed by i-shaped bars 20, the support bars 19 are fixed on the i-shaped bars 20 in the same row, and the support bars 19 fix the longitudinal force transfer rods 17.
The construction process of the colored composite concrete pavement is realized by the following steps:
a) constructing a base course, namely paving a roadbed and a cement stabilized macadam base in sequence by using a semi-rigid material by adopting a conventional construction method;
b) constructing a bituminous sand cushion, namely paving the bituminous sand cushion by taking emulsified asphalt and bituminous sand as raw materials;
the construction of the asphalt sand cushion is realized by the following steps:
b-1), spreading emulsified asphalt, and constructing an asphalt sand cushion layer after the roadbed is qualified; spreading the prepared emulsified asphalt with sprayer to the bottom at 0.7L/m2So as to be beneficial to combining and compacting;
b-2) paving asphalt sand, conveying the asphalt sand to a construction site, then unloading asphalt mixture into a forklift in batches, loading the paver by the forklift, and starting the paver to start paving construction when the mixture is filled to a hopper 2/3; the continuous forward movement of the paver is ensured, the speed of the paver is controlled to be 0.5-1.0 m/min at the beginning, and the normal traveling speed is controlled to be 1.0-2.0 m/min;
b-3), rolling, namely immediately performing compaction operation after paving the bituminous sand mixture, wherein the compaction principle is 'close following and slow pressing', otherwise, interlayer separation is easily caused, and the bituminous sand cannot be fully combined with the bridge floor; the roller is closely followed by the paver, and the steel wheel roller is firstly used for static pressure 2 times, and then the tyre roller is used for re-pressing twice.
c) The construction of the common concrete layer is carried out according to the following steps in sequence:
c-1) installing a template, namely installing a steel template around each pavement unit according to the size of the pavement unit;
in the step, the template is suitable for steel templates, non-standard parts such as bent channels and the like, and small-scale engineering can also adopt wood templates. The template has no damage and enough strength, the inner side, the top surface and the bottom surface are smooth, flat and straight, the local deformation is not more than 3mm, the maximum transverse deflection of the template during vibration is less than 4mm, the height is consistent with the thickness of a concrete pavement slab, the error is not more than +/-2 mm, the punching hole position of a pull rod of a longitudinal seam template flat seam is accurate, the length error of a tongue-and-groove seam is +/-1 mm of a steel template, and the length error of a wood template +/-2 mm of the tongue-and-groove seam. The templates were mounted in blocks of 5m x 4.5 m.
c-2) installing the reinforcing mesh, namely placing the reinforcing mesh between the templates according to the height position of the reinforcing mesh in the common concrete layer;
in this step, the reinforcing mesh sheets must not be stepped during the process of placing the reinforcing mesh. When the corner steel bar is placed, a layer of concrete mixture is paved at the corner of the placed steel bar, and the paving height is pre-added with a certain sinking degree compared with the designed position of the steel bar. After the corner steel is in place, it is pressed with concrete mix. When the edge reinforcing steel bars are placed, a concrete mixture is paved along the edges, the concrete mixture is compacted to the height of the reinforcing steel bars, then the edge reinforcing steel bars are placed, and the concrete mixture is used for pressing at the bent positions of the two ends. When two layers of reinforcing mesh sheets need to be placed, the reinforcing mesh sheets cannot be trampled in the process of placing the reinforcing mesh sheets. When the double-layer steel bar net sheets are placed, the upper and lower layers of steel bar net sheets can be placed in place once after being bundled into a framework by the vertical bars for plates with the thickness of not more than 250 mm. The thickness is more than 250mm, and the upper and lower layers of steel mesh sheets are placed twice.
c-3), installing dowel bars, installing transverse dowel bars with preset height and preset distance at the left side and the right side of the pavement unit to be poured, and positioning the transverse dowel bars by adopting a mode of reserving holes on templates at the left side and the right side of the pavement unit; then, a rear support is arranged at the front part of the pavement unit, a front support is arranged at the rear part of the pavement unit in front of the pavement unit adjacent to the current pavement unit, transverse supporting steel bars are fixed on the front support and the rear support, and longitudinal dowel bars are arranged on the supporting steel bars at equal intervals;
c-4), paving and vibrating, namely firstly sprinkling water to the roadbed, then pouring and paving concrete, vibrating the concrete by using a vibrating rod after the roadbed is paved to be approximately flat to enable the concrete to be compact, and manually leveling during vibrating;
in the step, tap water is needed to be used for sprinkling water to the roadbed before the pavement is poured, so that the roadbed is ensured to be wet, and the concrete is ensured not to be dried and solidified in a short time. The watering should ensure that the ground is moist but there should be no water accumulation. When the concrete arrives at the site, the concrete is poured from one end of the road, the concrete truck is directed to a proper position to release the concrete, a worker uses a tool to spread the concrete to the whole template area after the concrete is placed in the pavement template, and the leveling of the pavement is ensured, and after the pavement is approximately leveled, the concrete is vibrated by a vibrating rod to be dense. For concrete slabs with the thickness not greater than 220mm, the concrete slabs are vibrated sequentially by using an inserted vibrator and then are vibrated comprehensively in a crisscross mode by using a flat vibrator. When the concrete is vibrated vertically and horizontally, l00 mm-200 mm should be overlapped, and then a vibrating beam is used for vibrating and leveling. The position of the reinforcing steel bar is prevented from being displaced during vibration. The duration of the vibration of the vibrator at each position is subject to the conditions that the mixture stops sinking, no bubbles are generated and cement mortar is generated. When the plug-in type vibrator is matched with the flat-plate vibrator for use, the plug-in type vibrator is used for vibrating firstly, and then the flat-plate vibrator is used for vibrating. The concrete is paved twice, when the concrete mixture on the upper layer is vibrated, the plug-in vibrator is inserted into the concrete mixture on the lower layer by 50mm, and the vibration of the concrete mixture on the upper layer is completed before the concrete mixture on the lower layer is initially set. The moving distance of the inserted vibrator is not more than 0.5 time of the acting radius of the inserted vibrator, the distance between the inserted vibrator and the template is not more than 0.5 time of the acting radius of the vibrator, and the inserted vibrator and the reinforcing steel bars are prevented from being collided. During vibration, manual leveling is used as an auxiliary, and the template is checked at any time. If sinking, deforming or loosening, the correction should be carried out in time.
d) Constructing a colored concrete layer, namely paving colored concrete before the initial setting of a common concrete layer, paving the colored concrete mixed by a mixing station to the elevation position of the road surface at one time, and vibrating the concrete by using a vibrating rod after the colored concrete is approximately leveled to make the concrete compact; manual leveling is assisted during vibration;
e) before the colored concrete layer is initially set, arranging a layer of carborundum colored protective layer formed by wear-resistant materials on the surface of the colored concrete layer;
the construction of the carborundum color protective layer is realized by the following steps:
e-1) removing floating slurry, and uniformly removing a floating slurry layer on the surface of the colored concrete layer by using a mechanical trowel with a disc;
e-2), spreading materials, namely uniformly spreading 2/3 wear-resistant materials with specified dosage on the surface of the concrete in the initial setting stage to finish the first spreading operation, and after the wear-resistant materials absorb moisture, performing mechanical troweling operation of a loading disc; secondly, after the wear-resistant material is hardened to a certain stage, a second material spreading operation of 1/3 specified dosage of wear-resistant material is carried out;
e-3), carrying out disc slurry extracting operation, and carrying out at least secondary disc loading and slurry extracting operation after the wear-resistant material absorbs moisture; the mechanical trowel operation should be carried out in a staggered way;
e-4) mechanical trowel operation, performing at least three times of mechanical trowel operation without adding a disc; the change of the running speed of the mechanical trowel and the angle of the mechanical trowel can be adjusted according to the hardening condition of the concrete floor; the mechanical troweling operation should be carried out in a staggered way;
e-5), curing, namely curing the surface of the color carborundum protective layer by using a wear-resistant material curing agent when the water on the surface disappears, wherein the curing agent can effectively inhibit the water evaporation, and the curing time is 7 days.
f) Constructing the expansion joint, wherein the longitudinal expansion joint is formed in the construction process of the pavement unit, and the longitudinal expansion joint is formed after the concrete in the common concrete layer and the colorful concrete layer is initially set and then pulled out; the transverse expansion joint is formed by sawing and cutting by a sawing and sewing machine after the concrete is hardened;
in this step, the longitudinal joint is constructed according to the specification of the design file, and generally the longitudinal joint is a longitudinal construction joint. The pull rod is arranged before concrete is poured after the formwork is erected, the pull rod of the longitudinal construction joint penetrates through a pull rod hole of the formwork, and the transverse joint groove is suitable for being sawn by a sawing machine after the concrete is hardened; or the joint plates can be embedded in the pouring process, and the joint grooves can be formed after the concrete is initially set and pulled out. When sawing, the concrete can be carried out after the strength of the concrete reaches 5-10 Mpa, and the concrete can also be determined by field trial sawing. The transverse contraction joint is preferably sawed after the concrete is hardened, and can be formed by pressing the joint in newly cast concrete under the condition that the condition is not met. Sawing the seams in time, and sawing one piece at intervals of 3-4 plates in summer during construction, and then completely filling; it is also permissible to compress one contraction joint every 3-4 plates to prevent the concrete slab from cracking without sawing. The transverse expansion joint forms 90 degrees with the central line of the road, the joint wall must be vertical, the width of the joint is consistent, slurry cannot be connected in the joint, the lower part of the joint is provided with an expansion joint plate, and the upper part is filled with joint material. The expansion joint plate is prefabricated in advance, and commonly used plates include oil-immersed fiber plates (or cork plates), sponge rubber foam plates and the like. Before the prefabricated seam expansion plate is embedded into the wall, the seam wall is required to be clean and dry, and the seam expansion plate is tightly combined with the warp wall.
g) Filling gaps, namely cleaning impurities in the gaps when sealing the longitudinal expansion joints and the transverse expansion joints, and then sealing the gaps by using asphalt rubber sealing materials; the packing material is filled.
The work of sealing (filling) the joint is preferably carried out after the initial setting of the concrete, and impurities such as mud and sand in the joint are cleaned firstly when the joint is sealed. If the sealing seam is expansion seam, a thin layer of cold primer oil is coated in the wall of the seam, the sealing filler is filled, and the sealing filler is flush with the surface of the concrete plate in summer and is slightly lower than the surface of the concrete plate in winter. The commonly used seam sealing materials include two types, namely, heating construction type seam sealing materials, commonly used asphalt rubber seam sealing materials, and also can adopt polyvinyl chloride daub, asphalt mastic and the like. The warm construction type joint sealing material mainly comprises polyurethane joint sealing glue, polysulfide joint sealing glue, chloroprene rubber, emulsified asphalt rubber and other normal temperature construction type joint sealing materials.
Claims (10)
1. A colored composite concrete pavement comprises a road base layer (1), a cement stabilized macadam base layer (2), an asphalt sand cushion layer (3) and a concrete pavement layer which are arranged from bottom to top in sequence; the method is characterized in that: the concrete pavement layer is composed of a common concrete layer (4) positioned below and a colorful concrete layer (5) positioned above; reinforcing meshes (6) with a reinforcing effect are uniformly distributed in the common concrete layer, the common concrete layer and the color concrete layer corresponding to each reinforcing mesh form a pavement unit (7), and adjacent pavement units are separated by a longitudinal expansion joint (12) and a transverse expansion joint (18) which penetrate through the color concrete layer and penetrate into the upper part of the common concrete layer; transverse dowel bars (10) for realizing firm connection of two left and right adjacent pavement units are uniformly distributed in the common concrete layer (4) below the longitudinal expansion joint (12), and longitudinal dowel bars (17) for realizing firm connection of two front and rear adjacent pavement units are uniformly distributed below the transverse expansion joint (18).
2. The colored composite concrete pavement according to claim 1, wherein: the longitudinal expansion joints (12) and the transverse expansion joints (18) are both positioned below the reinforcing mesh (6), and the reinforcing mesh (6) is positioned at the 2/3 height of the common concrete layer (4).
3. A coloured composite concrete pavement according to claim 1 or 2, characterised in that: the road base layer (1) and the cement stabilized macadam base layer (2) are both made of semi-rigid materials, and the color of the color concrete adopted in the color concrete layer (5) is red, yellow, blue or green; the thickness of the common concrete layer (4) is 12-25 cm, and the thickness of the colorful concrete layer (5) is 3-6 cm.
4. The colored composite concrete pavement according to claim 2, wherein: a common concrete layer (4) of the front and rear adjacent two road surface units (7) is respectively provided with a trapezoidal front support (16) and a trapezoidal rear support (15), and supporting steel bars (19) for supporting the front end and the rear end of the longitudinal dowel bar (7) are fixed on the front support and the rear support.
5. A coloured composite concrete pavement according to claim 1 or 2, characterised in that: and the outer surfaces of the transverse dowel bars (10) below the longitudinal expansion joints (12) and the outer surfaces of the longitudinal dowel bars (17) below the longitudinal expansion joints (18) are coated with antirust coatings (11).
6. A coloured composite concrete pavement according to claim 1 or 2, characterised in that: the transverse length and the longitudinal length of the reinforcing mesh (6) along the road are respectively 5.0m and 4.5m, the distance between the two reinforcing meshes (6) adjacent to each other at the left and the right is 25cm, and the distance between the two reinforcing meshes (6) adjacent to each other at the front and the back is 30 cm.
7. The colored composite concrete pavement according to claim 4, wherein: a carborundum color protection layer is laid above the color concrete layer (5).
8. The construction process of the colored composite concrete pavement based on the claim 7 is realized by the following steps:
a) constructing a base course, namely paving a roadbed (1) and a cement stabilized macadam base (2) in sequence by using a semi-rigid material and adopting a conventional construction method;
b) constructing a bituminous sand cushion, namely paving the bituminous sand cushion by taking emulsified asphalt and bituminous sand as raw materials;
c) the construction of the common concrete layer is carried out according to the following steps in sequence:
c-1) installing templates, namely installing steel templates around the single pavement unit (7) according to the size of the pavement unit;
c-2) installing the reinforcing mesh, namely placing the reinforcing mesh (6) between the templates according to the height position of the reinforcing mesh (6) in the common concrete layer (4);
c-3), installing dowel bars, installing transverse dowel bars (10) with preset height and preset distance at the left side and the right side of a pavement unit (7) to be poured, and positioning the transverse dowel bars by reserving holes on templates at the left side and the right side of the pavement unit (7); then, a rear support (15) is placed at the front part of the pavement unit, a front support (16) is placed at the rear part of the pavement unit in front of the pavement unit adjacent to the current pavement unit, then transverse support steel bars (19) are fixed on the front support and the rear support, and longitudinal dowel bars (17) are arranged on the support steel bars at equal intervals;
c-4), paving and vibrating, namely firstly sprinkling water to the roadbed, then pouring and paving concrete, vibrating the concrete by using a vibrating rod after the roadbed is paved to be approximately flat to enable the concrete to be compact, and manually leveling during vibrating;
d) constructing a colored concrete layer, namely paving colored concrete before the initial setting of a common concrete layer, paving the colored concrete mixed by a mixing station to the elevation position of the road surface at one time, and vibrating the concrete by using a vibrating rod after the colored concrete is approximately leveled to make the concrete compact; manual leveling is used for vibration;
e) before the colored concrete layer is initially set, arranging a layer of colored carborundum protective layer made of wear-resistant materials on the surface of the colored concrete layer;
f) constructing the expansion joint, wherein the longitudinal expansion joint is formed in the construction process of the pavement unit, and the longitudinal expansion joint is formed after the concrete in the common concrete layer and the colorful concrete layer is initially set and then pulled out; the transverse expansion joint is formed by sawing and cutting by a sawing and sewing machine after the concrete is hardened;
g) filling gaps, namely cleaning impurities in the gaps when sealing the longitudinal expansion joints and the transverse expansion joints, and then sealing the gaps by using asphalt rubber sealing materials; the packing material is filled.
9. The construction process of a colored composite concrete pavement according to claim 8, wherein the asphalt sand cushion construction of the step b) is realized by the following steps:
b-1), spreading emulsified asphalt, and constructing an asphalt sand cushion layer after the roadbed is qualified; spreading the prepared emulsified asphalt with sprayer to the bottom at 0.7L/m2So as to be beneficial to combining and compacting;
b-2) paving asphalt sand, conveying the asphalt sand to a construction site, then unloading the asphalt mixture into a forklift in batches, loading the material into the paver by the forklift, and starting the paver to start paving construction when the material is filled into a hopper 2/3; the continuous forward movement of the paver is ensured, the speed of the paver is controlled to be 0.5-1.0 m/min at the beginning, and the normal traveling speed is controlled to be 1.0-2.0 m/min;
b-3), rolling, namely immediately performing compaction operation after paving the bituminous sand mixture, wherein the compaction principle is 'close following and slow pressing', otherwise, interlayer separation is easily caused, and the bituminous sand cannot be fully combined with the bridge floor; the roller is closely followed by the paver, and the steel wheel roller is firstly used for static pressure 2 times, and then the tyre roller is used for re-pressing twice.
10. The construction process of a colored composite concrete pavement according to claim 8 or 9, wherein the carborundum colored protection layer construction of step e) is realized by the following steps:
e-1) removing floating slurry, and uniformly removing a floating slurry layer on the surface of the colored concrete layer by using a mechanical trowel with a disc;
e-2), spreading materials, namely uniformly spreading 2/3 wear-resistant materials with specified dosage on the surface of the concrete in the initial setting stage to finish the first spreading operation, and after the wear-resistant materials absorb moisture, performing mechanical troweling operation of a loading disc; secondly, after the wear-resistant material is hardened to a certain stage, a second material spreading operation of 1/3 specified dosage of wear-resistant material is carried out;
e-3), carrying out disc slurry extracting operation, and carrying out at least secondary disc loading and slurry extracting operation after the wear-resistant material absorbs moisture; the mechanical trowel operation should be carried out in a staggered way;
e-4) mechanical trowel operation, performing at least three times of mechanical trowel operation without adding a disc; the change of the running speed of the mechanical trowel and the angle of the mechanical trowel can be adjusted according to the hardening condition of the concrete floor; the mechanical troweling operation should be carried out in a staggered way;
e-5), curing, namely curing the surface of the color carborundum protective layer by using a wear-resistant material curing agent when the water on the surface disappears, wherein the curing agent can effectively inhibit the water evaporation, and the curing time is 7 days.
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