CN113774746A - Pretensioned prestressed concrete assembled pavement and preparation method thereof - Google Patents
Pretensioned prestressed concrete assembled pavement and preparation method thereof Download PDFInfo
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- CN113774746A CN113774746A CN202111031225.XA CN202111031225A CN113774746A CN 113774746 A CN113774746 A CN 113774746A CN 202111031225 A CN202111031225 A CN 202111031225A CN 113774746 A CN113774746 A CN 113774746A
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- 239000010959 steel Substances 0.000 claims abstract description 83
- 238000011049 filling Methods 0.000 claims abstract description 33
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Images
Classifications
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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
- E01C5/00—Pavings made of prefabricated single units
- E01C5/06—Pavings made of prefabricated single units made of units with cement or like binders
- E01C5/065—Pavings made of prefabricated single units made of units with cement or like binders characterised by their structure or component materials, e.g. concrete layers of different structure, special additives
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- E01C5/00—Pavings made of prefabricated single units
- E01C5/06—Pavings made of prefabricated single units made of units with cement or like binders
- E01C5/08—Reinforced units with steel frames
- E01C5/10—Prestressed reinforced units ; Prestressed coverings from reinforced or non-reinforced units
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2015—Sulfate resistance
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/22—Carbonation resistance
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/29—Frost-thaw resistance
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a pretensioning prestressed concrete fabricated pavement and a preparation method thereof, wherein the concrete fabricated pavement comprises a concrete panel, prestressed steel bars, reinforcing steel bars, a joint filling plate, a caulking material and grouting liquid, wherein the prestressed steel bars are longitudinally arranged, bound with the transversely distributed reinforcing steel bars and uniformly distributed in the concrete panel; joint filling plates are arranged on the periphery of the concrete panel and are positioned at joints between adjacent concrete assembled pavements, and caulking materials are poured on the joint filling plates; grouting holes are formed in the concrete panel in a penetrating mode, and each grouting hole is used for injecting grouting liquid; the reverse side of the concrete panel is connected with the base layer at the bottom through grouting liquid. The invention has good integrity, high bearing capacity and strong durability, and can reduce the occurrence probability of diseases of the cement concrete pavement; the construction and maintenance period can be greatly shortened, the on-site labor cost is reduced, the traffic pressure of the heavy-load traffic road section is relieved, and the method has a wide application prospect.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of fabricated pavements, in particular to a pretensioned prestressed concrete fabricated pavement and a preparation method thereof.
[ background of the invention ]
Roads built in early domestic and existing low-grade highways are mainly cement concrete pavements. The cement concrete pavement is a rigid pavement, and mainly takes cement concrete as a main material as a surface layer. The high-strength water-resistant and durable road surface material has the advantages of high strength, water stability, good durability, low maintenance cost and the like, is widely applied to traffic roads, and has the defects of slow open traffic, difficult repair and the like. The service life of the cement road surface is generally 10-30 years, but in some cement road surfaces for heavy-duty traffic, even in the early stage of use, common diseases such as cracks, arching, corner falling, slab staggering, mud pumping, plate bottom hollowing and the like are easy to occur.
This means that the cement concrete pavement of the existing roads of various grades is exposed to enormous maintenance and replacement work. Most cement pavements built in the early stage mainly use two-way lanes, and generally do not exceed four lanes. Generally, the repair of the road is basically implemented by closing a half of the road and then repairing the road in blocks. For roads with large traffic flow, the scheme has long repair period, and the traffic can be opened after the concrete reaches the specified maintenance period, so that greater pressure is brought to the originally busy traffic, and even traffic accidents are easily caused.
The common serious diseases of the cement concrete road, such as slab staggering, slab breaking, through cracks and the like, are mainly concentrated on the parts with frequent ruts, uneven settlement of a base layer and poor joint treatment. Therefore, in the treatment, it is necessary to take measures for replacement, repair, and reinforcement of the road slab at these portions. If a novel pavement slab and a corresponding construction technology can be developed, the damaged pavements are integrally replaced, the construction efficiency and the pavement quality can be greatly improved, and the total cost is controllable or even more economical while the service life of the pavements is prolonged. It is clear that such products and technologies are more suitable for current and future road traffic.
[ summary of the invention ]
The invention aims to solve the technical problem of providing a pretensioning prestressed concrete assembled pavement and a preparation method thereof, wherein the pavement has good integrity, high bearing capacity and strong durability, and can reduce the occurrence probability of diseases of a cement concrete pavement; the construction and maintenance period can be greatly shortened, the on-site labor cost is reduced, the traffic pressure of the heavy-load traffic road section is relieved, and the method has a wide application prospect.
The invention is realized by the following steps:
a pretensioning prestressed concrete fabricated pavement comprises a concrete panel, prestressed steel bars, reinforcing steel bars, a joint filling plate, a joint filling material and a grouting liquid, wherein the prestressed steel bars are longitudinally arranged and bound with the transversely distributed reinforcing steel bars and uniformly distributed in the concrete panel;
joint filling plates are arranged on the periphery of the concrete panel and are positioned at joints between adjacent concrete assembled pavements, and caulking materials are poured on the joint filling plates; each prestressed steel bar and each steel bar penetrate through the corresponding joint filling plate;
grouting holes are formed in the concrete panel in a penetrating mode, and each grouting hole is used for injecting grouting liquid; the reverse side of the concrete panel is connected with the base layer at the bottom through grouting liquid.
Further, the concrete panel comprises the following raw materials in parts by weight: 400 portions of cement, 100 portions of mineral admixture, 200 portions of coarse aggregate, 1300 portions of coarse aggregate, 500 portions of fine aggregate, 200 portions of water, 5-15 portions of water reducer and 3-8 portions of air entraining agent.
Further, the cement is 42.5 Portland cement; the coarse aggregate is graded broken stone, the maximum grain size is not more than 25mm, and the mud content is not more than 0.5%; the fine aggregate is sand, and the sand is natural river sand with fineness modulus of 2.5-3.0 and mud content of less than or equal to 1%; the mineral admixture is composed of silica fume and S95 granulated blast furnace slag powder in a weight ratio of 1: 2.
Further, the water reducing agent is a polycarboxylic acid high-performance water reducing agent; the air entraining agent is AH series.
Furthermore, first preformed holes are formed in the two longitudinal side faces, and each first preformed hole corresponds to the prestressed steel bar on the adjacent concrete assembly type pavement.
Furthermore, a second preformed hole is formed in the transverse side face extending out of one end of each steel bar, and each second preformed hole corresponds to the adjacent steel bar on the concrete assembled pavement.
Furthermore, the thickness of the concrete panel is 10-20cm, the front surface of the concrete panel is a plane with a napping groove, the back surface of the concrete panel is a sawtooth-shaped napping surface, and the peripheral side surfaces of the concrete panel are all smooth planes.
Furthermore, the width of the napping grooves in the front face of the concrete panel is 2-3mm, the depth of the napping grooves is 1-2mm, the napping grooves are transversely arranged along the concrete panel, and the distance between the napping grooves is 2-3 mm.
Furthermore, the joint filling plate adopts a sponge rubber foam plate, the joint filling material adopts a tar type polyurethane joint filling material, and the grouting liquid adopts cement slurry doped with an early strength agent and an expanding agent.
Further, the preparation method of the pretensioning prestressed concrete assembled pavement comprises the following steps:
putting the coarse aggregate and the fine aggregate into a forced mixer, uniformly stirring, then putting the cement and the admixture, adding 10% of water, starting stirring, then continuously adding the mixture of the residual water, the water reducing agent and the air entraining agent, continuously stirring for 3-4 minutes, and finally preparing the concrete with the slump of 70-120 mm;
uniformly placing transversely distributed steel bars on a steel die through prefabricated cushion blocks, longitudinally placing prestressed steel bars on the transversely distributed steel bars through holes at two ends of the steel die and binding the prestressed steel bars, uniformly pouring the concrete prepared in the step 1 into the steel die, tensioning two ends of the prestressed steel bars by using a tensioning machine after die assembly, controlling the tensioning force to be 0.7 times of the tensile strength of the steel bars, and anchoring two ends by using bolts after tensioning is finished; the inner bottom surface of the steel die is a sawtooth-shaped rough surface, the inner top surface of the steel die is a cover plate with a rough groove, and the peripheral side surfaces of the steel die are smooth planes;
then, hoisting the tensioned steel die on a vibration table to make the concrete vibrate, compact and form; after the concrete is preliminarily condensed and formed, removing the steel mould cover plate, placing the concrete in a steam curing pool for curing to the specified demolding strength, then performing prestress tension releasing and demolding, finally hoisting the prepared concrete assembled pavement to a storage yard for natural curing, and transporting the concrete assembled pavement to the site for use as a finished product after reaching the specified strength standard of delivery.
The invention has the following advantages:
in a word, the pretensioning prestressed concrete assembled pavement is a novel concrete prefabricated pavement, has good integrity, high bearing capacity and strong durability, can be tightly combined with a base layer, and greatly reduces the probability of diseases of the cement concrete pavement; the construction and maintenance period can be greatly shortened, the on-site labor cost is reduced, and the traffic pressure of the heavy-load traffic road section is relieved. Meanwhile, the application range of the road is quite wide, and the road is suitable for various use conditions such as new roads, old roads, temporary road erection and the like. Compared with a continuously reinforced cement concrete pavement, the consumption of materials such as concrete, reinforcing steel bars and the like is much less, but the integrity and the mechanical property are superior to those of the continuously reinforced concrete pavement. Therefore, the pretensioning prestressed concrete assembled pavement has the characteristics of wide application range, excellent mechanical property, outstanding cost performance and wide application prospect.
[ description of the drawings ]
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
FIG. 1 is a schematic longitudinal cross-sectional view of a pre-tensioned prestressed concrete fabricated pavement of the present invention.
FIG. 2 is a schematic plan view of a pretensioned prestressed concrete fabricated pavement of the present invention.
In the figure:
concrete assembled pavement-10, concrete panel-1, prestressed steel bar-2, reinforcing steel bar-3, joint filling plate-4, caulking material-5, grouting hole-6, first preformed hole-7 and second preformed hole-8
[ detailed description ] embodiments
The technical solution of the present invention will be clearly and completely described with reference to the accompanying drawings 1-2 and the detailed description. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention relates to a pretensioning prestressed concrete fabricated pavement, which comprises a concrete panel 1, prestressed steel bars 2, steel bars 3, a joint filling plate 4, a joint filling material 5 and grouting liquid, wherein the prestressed steel bars 2 are longitudinally arranged and bound with the transversely distributed steel bars 3 and uniformly arranged in the concrete panel 1, two ends of each prestressed steel bar 2 extend out of the longitudinal side surface of the concrete panel 1, and one end of each steel bar 3 extends out of the transverse side surface of the concrete panel 1;
In one embodiment, the following is preferred: the concrete panel comprises the following raw materials in parts by weight: 400 portions of cement, 100 portions of mineral admixture, 200 portions of coarse aggregate, 1300 portions of coarse aggregate, 500 portions of fine aggregate, 200 portions of water, 5-15 portions of water reducer and 3-8 portions of air entraining agent.
In one embodiment, the following is preferred: the cement is 42.5 Portland cement; the coarse aggregate is graded broken stone, the maximum grain size is not more than 25mm, and the mud content is not more than 0.5%; the fine aggregate is sand, and the sand is natural river sand with fineness modulus of 2.5-3.0 and mud content of less than or equal to 1%; the mineral admixture is composed of silica fume and S95 granulated blast furnace slag powder in a weight ratio of 1: 2.
In one embodiment, the following is preferred: the water reducing agent is a polycarboxylic acid high-performance water reducing agent; the air entraining agent is AH series.
In one embodiment, the following is preferred: first preformed holes 7 are formed in the two longitudinal side faces, and each first preformed hole 7 corresponds to the prestressed steel bar 2 on the adjacent concrete fabricated pavement 10.
In one embodiment, the following is preferred: and a second preformed hole 8 is formed in the transverse side surface extending out of one end of each reinforcing steel bar 3, and each second preformed hole 8 corresponds to the adjacent reinforcing steel bar 3 on the concrete assembled pavement 10.
In one embodiment, the following is preferred: the thickness of the concrete panel 1 is 10-20cm, the front surface of the concrete panel 1 is a plane with a napping groove, the back surface of the concrete panel 1 is a sawtooth-shaped napping surface, and the peripheral side surfaces of the concrete panel are smooth planes.
In one embodiment, the following is preferred: the width of the napping grooves in the front face of the concrete panel 1 is 2-3mm, the depth of the napping grooves is 1-2mm, the napping grooves are transversely arranged along the concrete panel 1, and the distance between the napping grooves is 2-3 mm.
In one embodiment, the following is preferred: the joint filling plate 4 is a sponge rubber foam plate, the joint filling material 5 is a tar type polyurethane joint filling material, and the grouting liquid is cement slurry doped with an early strength agent and an expanding agent.
The invention also relates to a preparation method of the pretensioning prestressed concrete assembled pavement, which comprises the following steps:
putting the coarse aggregate and the fine aggregate into a forced mixer, uniformly stirring, then putting the cement and the admixture, adding 10% of water, starting stirring, then continuously adding the mixture of the residual water, the water reducing agent and the air entraining agent, continuously stirring for 3-4 minutes, and finally preparing the concrete with the slump of 70-120 mm;
uniformly placing transversely distributed steel bars on a steel die through prefabricated cushion blocks, longitudinally placing prestressed steel bars on the transversely distributed steel bars through holes at two ends of the steel die and binding the prestressed steel bars, uniformly pouring the concrete prepared in the step 1 into the steel die, tensioning two ends of the prestressed steel bars by using a tensioning machine after die assembly, controlling the tensioning force to be 0.7 times of the tensile strength of the steel bars, and anchoring two ends by using bolts after tensioning is finished; the inner bottom surface of the steel die is a sawtooth-shaped rough surface, the inner top surface of the steel die is a cover plate with a rough groove, and the peripheral side surfaces of the steel die are smooth planes;
then, hoisting the tensioned steel die on a vibration table to make the concrete vibrate, compact and form; after the concrete is preliminarily condensed and formed, removing the steel mould cover plate, placing the concrete in a steam curing pool for curing to the specified demolding strength, then performing prestress tension releasing and demolding, finally hoisting the prepared concrete assembled pavement to a storage yard for natural curing, and transporting the concrete assembled pavement to the site for use as a finished product after reaching the specified strength standard of delivery.
The invention will be further described with reference to the construction and installation of specific embodiments.
Examples 1,
The old road is dismantled and reformed, the damaged concrete pavement section is chiseled off firstly, the original road around the concrete fabricated pavement 10 is cut to be straight, and the corresponding position of the original road is drilled with a prestressed steel bar 2 and a reinforcing steel bar 3 which are used for inserting the concrete fabricated pavement 10 in a socket mode. And then cleaning a base layer within the range of 20cm below the lower layer of the concrete assembled pavement 10, adopting a cement-soil crushed stone stabilizing layer as the base layer of the new panel, compacting and leveling, and controlling the unevenness of the base layer to be less than or equal to 1 cm. And then coating asphalt and wrapping a polyethylene film on a prestressed steel bar 2 and a reinforcing steel bar 3 reserved on the concrete fabricated pavement 10. The method is characterized in that an automobile crane is adopted and is connected with a special lifting appliance through a lifting hole to lift, the pre-stressed steel bar 2 and the steel bar 3 of the concrete fabricated pavement 10 are aligned with a drilled hole to be inserted and installed, caulking materials 5 are poured into the circumferential caulking plates 4, and the pavement flatness after installation meets the requirement. And finally, filling and reinforcing the gap between the concrete panel 1 and the foundation layer by using cement grout doped with an early strength agent and an expanding agent through the grouting hole, stopping grouting when the grouting liquid slightly overflows from the gaps around the bottom of the concrete panel 1, and formally installing the pavement panel. After the installation is finished for one to two days, the enclosure can be disassembled and the traffic is opened.
Examples 2,
When the concrete fabricated pavement 10 is adopted to assemble a complete road, first preformed holes 7 are formed in the two longitudinal side faces of the concrete panel 1 of the concrete fabricated pavement 10 of each unit, and each first preformed hole 7 corresponds to the prestressed steel bar 2 on the adjacent concrete fabricated pavement 10; second preformed holes 8 are formed in the transverse side faces, and each second preformed hole 8 corresponds to the steel bar 3 on the adjacent concrete assembled pavement 10 (two concrete assembled pavements 10 are transversely placed on the road and connected with the second preformed holes 8 through the steel bars 3; the longitudinal concrete assembled pavements 10 are connected with the first preformed holes 7 through the prestressed steel bars 2);
and then coating asphalt and wrapping a polyethylene film on a prestressed steel bar 2 and a reinforcing steel bar 3 reserved on the concrete fabricated pavement 10. The method is characterized in that an automobile crane is adopted and is connected with a special lifting appliance through a lifting hole to lift, the reserved prestressed steel bar 2 and the steel bar 3 of the concrete fabricated pavement 10 are aligned to the first reserved hole 7 and the second reserved hole 8 of the placed concrete fabricated pavement 10 to be inserted and installed, caulking materials 5 are poured into the circumferential caulking plates 4, and the pavement flatness after installation meets the requirement. And finally, filling and reinforcing the gap between the concrete panel and the foundation layer by using cement grout doped with an early strength agent and an expanding agent through the grouting hole, stopping grouting when the grouting liquid slightly overflows from the holes around the bottom of the concrete panel, and finishing formal installation. After the installation is finished for one to two days, the enclosure can be disassembled and the traffic is opened.
Examples 3,
When the damaged units of the complete road assembled by the concrete fabricated pavement are to be removed, the damaged concrete fabricated pavement units can be removed first, and the rest of the assembly steps are the same as those in embodiment 2.
The following table 1 shows the concrete component ratio of the inventive example and the comparative example, table 2 shows the comparison of the detection performance of the concrete prepared in the inventive example and the comparative example, and table 3 shows the comparison of the performance of different pavement slabs prepared by the concrete prepared in example 4.
Table 1 concrete mixing proportion units (parts) of examples and comparative examples
Table 2, concrete test results of examples and comparative examples
According to the analysis of the test results of the examples and the comparative examples in the tables 1 and 2, the concrete for manufacturing the pavement slab of the invention can fully exert the performance of the material under the condition of reasonable component proportion, and the prepared concrete has considerable performance. The compressive strength of the material can reach more than C80, and the material has unusual performances in the aspects of carbonization resistance, erosion resistance, freezing resistance and the like.
TABLE 3 comparison of the Performance parameters of the examples with those of the control
According to the analysis of the test results of the examples and the comparative examples in the table 3, the performance advantage of the prestressed concrete pavement slab is obviously superior to that of the continuous reinforced concrete under the condition that the concrete components are the same. After the prestress is applied, the deflection of the pavement slab under the same load is smaller, the area generating the tensile stress is smaller, the bending tensile strength of the concrete pavement is greatly improved, and the fatigue resistance is better. In addition, the consumption of concrete and steel materials is less, and the method also has great advantage in economic efficiency.
In conclusion, the invention has the following advantages:
1. the pre-tensioning prestressed concrete assembled pavement manufactured by the invention only needs to directly install the prefabricated concrete assembled pavement on the leveled base layer, and does not need to undergo the procedures of binding of reinforcing steel bars, pouring, vibrating, curing of concrete, joint cutting and the like on a construction site, so that the construction period is greatly shortened, and the labor cost on the site is reduced. The method is not only suitable for dismantling and maintaining the damaged old cement road, but also suitable for quick construction of a new road, can open traffic as early as possible, greatly relieves traffic pressure of heavy-load traffic road sections, and shortens construction and maintenance period.
2. According to the pre-tensioning prestressed concrete assembled pavement manufactured by the invention, the prestressed steel bars are tensioned during preparation, the tensioning force borne by the prestressed steel bars is transmitted to the concrete panel, the pre-tensioning stress is applied to the concrete panel, the bending tensile strength of the concrete section is improved, and thus, a part of bending tensile stress generated by wheel load and temperature is offset. Therefore, under the same load, the thickness of the prestressed concrete pavement is much thinner (10-20CM), which is generally about 50% of the thickness of the common concrete pavement. The prestress can greatly lengthen the length of the concrete panel according to actual requirements, and the length can reach more than 10m, so that the longitudinal joints of the concrete pavement are greatly reduced. Besides the saving of concrete consumption, the consumption of the reinforcing bars of the prestressed concrete pavement is far less than that of a continuously reinforced cement concrete pavement.
3. The invention adopts the prestressed steel bar as the main bar, one end of the prestressed steel bar is fixed at one longitudinal side of the concrete panel, the other end of the prestressed steel bar is used as a dowel bar and can slide in the preformed hole or the drilled hole of the concrete panel at the adjacent side, thereby transferring the travelling load between the two concrete panels, greatly reducing the occurrence of platform dislocation, simultaneously increasing the stress transfer between the adjacent concrete blocks, leading the adjacent concrete panels to bear the force together, and preventing the uneven settlement, plate breakage and the like of the concrete pavement caused by the larger local stress of the concrete pavement. In addition, through concrete panel reservation slip casting hole all around, carry out the slip casting to the space between the concrete panel slab bottom and the basic unit road bed after concrete panel installation is fixed and fill, make basic unit road bed and road surface form firm whole, avoided the condition emergence of the board bottom void.
4. The invention mixes the silicon ash and the granulated blast furnace slag powder into the concrete, and the active ingredients in the two admixtures react with the calcium hydroxide in the cement to generate hydration products such as calcium aluminosilicate and the like. The compression resistance, bending resistance and splitting tensile strength of the concrete can be enhanced. In addition, the silica fume has good filling effect, can improve the compactness of concrete, can also obviously improve the alkali-aggregate reaction of the concrete, and keeps the stable increase of later strength. The added polycarboxylate water reducing agent and air entraining agent components reduce the viscosity of the concrete under the condition of low water consumption, and a certain amount of uniformly distributed micro bubbles are introduced, so that the heat conductivity of the concrete can be reduced, the performances of the concrete such as volume stability, frost resistance, salt resistance, impermeability and the like are enhanced, and the assembled pavement is ensured to have better durability and longer service life.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.
Claims (10)
1. The utility model provides a pretensioning method prestressed concrete assembled road surface which characterized in that: the concrete assembly type pavement comprises a concrete panel, prestressed steel bars, reinforcing steel bars, a joint filling plate, a joint filling material and a grouting liquid, wherein the prestressed steel bars are longitudinally arranged and bound with the transversely distributed reinforcing steel bars and are uniformly distributed in the concrete panel;
joint filling plates are arranged on the periphery of the concrete panel and are positioned at joints between adjacent concrete assembled pavements, and caulking materials are poured on the joint filling plates; each prestressed steel bar and each steel bar penetrate through the corresponding joint filling plate;
grouting holes are formed in the concrete panel in a penetrating mode, and each grouting hole is used for injecting grouting liquid; the reverse side of the concrete panel is connected with the base layer at the bottom through grouting liquid.
2. A pre-tensioned prestressed concrete fabricated pavement as claimed in claim 1, wherein: the concrete panel comprises the following raw materials in parts by weight: 400 portions of cement, 100 portions of mineral admixture, 200 portions of coarse aggregate, 1300 portions of coarse aggregate, 500 portions of fine aggregate, 200 portions of water, 5-15 portions of water reducer and 3-8 portions of air entraining agent.
3. A pre-tensioned prestressed concrete fabricated pavement as claimed in claim 2, wherein: the cement is 42.5 Portland cement; the coarse aggregate is graded broken stone, the maximum grain size is not more than 25mm, and the mud content is not more than 0.5%; the fine aggregate is sand, and the sand is natural river sand with fineness modulus of 2.5-3.0 and mud content of less than or equal to 1%; the mineral admixture is composed of silica fume and S95 granulated blast furnace slag powder in a weight ratio of 1: 2.
4. A pre-tensioned prestressed concrete fabricated pavement as claimed in claim 2, wherein: the water reducing agent is a polycarboxylic acid high-performance water reducing agent; the air entraining agent is AH series.
5. A pre-tensioned prestressed concrete fabricated pavement as claimed in claim 1, wherein: first preformed holes are formed in the two longitudinal side faces, and each first preformed hole corresponds to the prestressed steel bar on the adjacent concrete fabricated pavement.
6. A pre-tensioned prestressed concrete fabricated pavement as claimed in claim 1, wherein: and second preformed holes are formed in the transverse side surface extending out of one end of each reinforcing steel bar, and each second preformed hole corresponds to the adjacent reinforcing steel bar on the concrete assembled pavement.
7. A pre-tensioned prestressed concrete fabricated pavement as claimed in claim 1, wherein: the thickness of the concrete panel is 10-20cm, the front surface of the concrete panel is a plane with a hair pulling groove, the back surface of the concrete panel is a sawtooth-shaped hair surface, and the peripheral side surfaces of the concrete panel are smooth planes.
8. A pre-tensioned prestressed concrete fabricated pavement as claimed in claim 7, wherein: the width of the napping grooves in the front face of the concrete panel is 2-3mm, the depth of the napping grooves is 1-2mm, the napping grooves are transversely arranged along the concrete panel, and the distance between the napping grooves is 2-3 mm.
9. A pre-tensioned prestressed concrete fabricated pavement as claimed in claim 1, wherein: the joint filling plate is a sponge rubber foam plate, the joint filling material is a tar type polyurethane joint filling material, and the grouting liquid is cement slurry doped with an early strength agent and an expanding agent.
10. A method of producing a pretensioned prestressed concrete fabricated pavement according to any of claims 1 to 9, characterized in that: the method comprises the following steps:
step 1, preparation of concrete:
putting the coarse aggregate and the fine aggregate into a forced mixer, uniformly stirring, then putting the cement and the admixture, adding 10% of water, starting stirring, then continuously adding the mixture of the residual water, the water reducing agent and the air entraining agent, continuously stirring for 3-4 minutes, and finally preparing the concrete with the slump of 70-120 mm;
step 2, manufacturing a road slab:
uniformly placing transversely distributed steel bars on a steel die through prefabricated cushion blocks, longitudinally placing prestressed steel bars on the transversely distributed steel bars through holes at two ends of the steel die and binding the prestressed steel bars, uniformly pouring the concrete prepared in the step 1 into the steel die, tensioning two ends of the prestressed steel bars by using a tensioning machine after die assembly, controlling the tensioning force to be 0.7 times of the tensile strength of the steel bars, and anchoring two ends by using bolts after tensioning is finished; the inner bottom surface of the steel die is a sawtooth-shaped rough surface, the inner top surface of the steel die is a cover plate with a rough groove, and the peripheral side surfaces of the steel die are smooth planes;
then, hoisting the tensioned steel die on a vibration table to make the concrete vibrate, compact and form; after the concrete is preliminarily condensed and formed, removing the steel mould cover plate, placing the concrete in a steam curing pool for curing to the specified demolding strength, then performing prestress tension releasing and demolding, finally hoisting the prepared concrete assembled pavement to a storage yard for natural curing, and transporting the concrete assembled pavement to the site for use as a finished product after reaching the specified strength standard of delivery.
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