CN111155401A - One-step paving and forming construction method for water-stable base layer - Google Patents
One-step paving and forming construction method for water-stable base layer Download PDFInfo
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- CN111155401A CN111155401A CN202010063188.XA CN202010063188A CN111155401A CN 111155401 A CN111155401 A CN 111155401A CN 202010063188 A CN202010063188 A CN 202010063188A CN 111155401 A CN111155401 A CN 111155401A
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- 238000010276 construction Methods 0.000 title claims abstract description 177
- 239000000203 mixture Substances 0.000 claims abstract description 65
- 238000000034 method Methods 0.000 claims abstract description 39
- 239000004568 cement Substances 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000005096 rolling process Methods 0.000 claims description 44
- 229910000831 Steel Inorganic materials 0.000 claims description 34
- 239000010959 steel Substances 0.000 claims description 34
- 230000003068 static effect Effects 0.000 claims description 15
- 238000005056 compaction Methods 0.000 claims description 13
- 230000036541 health Effects 0.000 claims description 11
- 238000012360 testing method Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 7
- 239000004746 geotextile Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000012258 stirred mixture Substances 0.000 claims description 3
- 238000010415 tidying Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 15
- 238000010409 ironing Methods 0.000 description 10
- 238000002156 mixing Methods 0.000 description 7
- 230000007480 spreading Effects 0.000 description 6
- 238000003892 spreading Methods 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000008239 natural water Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
- E01C19/4806—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with solely rollers for consolidating or finishing
-
- 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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
- E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
- E01C19/231—Rollers therefor; Such rollers usable also for compacting soil with both elastically-deformable and rigid rolling elements, e.g. pneumatic-tyred compactor with selectively operative or inoperative steel-faced roll
- E01C19/233—Rollers therefor; Such rollers usable also for compacting soil with both elastically-deformable and rigid rolling elements, e.g. pneumatic-tyred compactor with selectively operative or inoperative steel-faced roll the rigid rolling elements being vibrated or subjected to impacts
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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
- E01C21/00—Apparatus or processes for surface soil stabilisation for road building or like purposes, e.g. mixing local aggregate with binder
-
- 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
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/01—Devices or auxiliary means for setting-out or checking the configuration of new surfacing, e.g. templates, screed or reference line supports; Applications of apparatus for measuring, indicating, or recording the surface configuration of existing surfacing, e.g. profilographs
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Machines (AREA)
Abstract
The invention provides a one-step paving and forming construction method for a cement stabilized base layer, which relates to the technical field of road construction processes and comprises the following steps: measuring and lofting a road construction area to confirm the paving thickness in the construction area; carrying out primary paving construction on the mixture in the construction area according to the paving thickness, carrying out vibration construction on the side edges of the two sides of the road in the construction area in the paving process, and synchronously operating the vibration construction and the paving construction; realized having accomplished the closely knit operation of vibrating of side in step at the in-process that paves, consequently no longer need pave the back rethread manpower and many road both sides carry out the tamping operation, the road both sides of alleviating existence among the prior art utilize the template to block, can't guarantee the roughness and the closely knit degree of road both sides, utilize artifical a lot of to carry out the tamping operation to road both sides simultaneously, cause the human cost high, and pave many times and cause the connection defect between the steady basic unit of adjacent two-layer water that paves, the technical problem that the efficiency of paving is low.
Description
Technical Field
The invention relates to the technical field of road construction processes, in particular to a one-step paving forming construction method for a cement stabilized base layer.
Background
The semi-rigid water-stable base course is widely applied to road engineering in China, the construction of the water-stable base course is carried out from the beginning with the loose paving thickness not more than 20cm, and in recent years, the loose paving thickness of the water-stable macadam base course is increased to 30cm, 35cm and 40cm … … through double-layer combined paving and three-layer combined paving, and even the maximum loose paving thickness reaches 60 cm.
In the prior art, in the process of paving a road, due to the increase of paving thickness, templates are arranged on two sides of the road, and paving materials are limited in a construction area by utilizing the blocking effect of the templates; specifically, after one layer of paving, the two sides of the layer of paving are manually tamped, and after the two sides of the layer of paving are tamped, the next layer of paving is carried out again.
However, the templates only have a blocking effect, and in order to prevent the screed of the paver from interfering with the templates on the two sides, a certain gap exists between the screed of the paver and the templates, so that the paving evenness on the two sides of the road cannot be guaranteed, and the compactness on the two sides of the road cannot be guaranteed, and therefore, each layer of paving needs to be manually tamped, so that the construction preparation work is increased, and the labor cost is high; the multilayer paving easily causes the connection defect between two adjacent paving water-stable base layers, and causes the potential safety hazard of unstable road layering; meanwhile, the problem of low paving efficiency and high paving cost can be caused by multi-layer paving.
Disclosure of Invention
The invention aims to provide a one-time paving and forming construction method for a water-stabilized base layer, which solves the technical problems that in the prior art, flatness and compactness of two sides of a road cannot be guaranteed by utilizing templates on the two sides of the road, meanwhile, the two sides of the road are tamped by manpower for multiple times, so that the labor cost is high, the connection defect between two adjacent paving water-stabilized base layers is caused by multiple paving, and the paving efficiency is low.
The invention provides a one-time paving and forming construction method for a cement stabilized base, which comprises the following steps of:
measuring and lofting a road construction area to confirm the paving thickness in the construction area;
and carrying out primary paving construction on the mixture in the construction area according to the paving thickness, carrying out vibration construction on the side edges of the two sides of the road in the construction area in the paving process, and synchronously operating the vibration construction and the paving construction.
In a preferred embodiment of the present invention, the vibrating construction comprises the steps of:
the method comprises the following steps that a paver is utilized to carry out primary paving construction on mixed materials in a construction area, a vibrating plate and a vibrator are arranged on two sides of an ironing plate of the paver, the vibrator is in transmission connection with the vibrating plate, the vibrating plate is in sliding connection with two sides of the ironing plate, and the vibrator is used for driving the vibrating plate to reciprocate along the extending direction of the ironing plate so as to vibrate and compact the mixed materials on two sides of a road through the vibrating plate;
wherein the paving width range of the screed plate of the paver is 0-12 m.
In a preferred embodiment of the present invention, the step of performing measurement lofting on the road construction area further includes:
in the construction process, the construction layout of hanging lines in construction areas on two sides of a road is adopted: a plurality of supporting rods are arranged outside the line edge of an area needing paving, and the supporting rods are arranged at equal intervals; and determining the steel wire elevation according to the paving thickness of the cement stabilized base layer and the position of a sensor of the paver, hanging steel wires among a plurality of supporting rods, and paving after confirming that the supporting rods are checked to be correct with the reference steel wire frame elevation, wherein the deflection of the steel wires is less than 2 mm.
In a preferred embodiment of the present invention, the paving step further comprises the following steps:
stirring the mixture, and transporting the mixture to a construction area;
wherein the cement dosage of the mixture is 5.0 percent, the water content of the mixture is 5.3 to 6.3 percent, and the maximum dry density is 2.352g/m3；
The transport time of the stirred mixture is less than 2 hours.
In a preferred embodiment of the present invention, the paving step further comprises the following steps:
carrying out rolling construction on the paved construction area;
wherein, the rolling construction step comprises primary static pressure construction, vibration construction and secondary static pressure construction.
In a preferred embodiment of the present invention, the rolling construction further comprises:
static pressure of a double-steel-wheel road roller of not less than 13T is adopted for one time, and the compactness is 20%;
weak vibration is carried out once and strong vibration is carried out four times by adopting a road roller with the vibration of not less than 26T, and the compaction degrees are respectively 30%, 40%, 50% and 65%;
carrying out strong vibration construction on the base layer for four times by adopting a vibratory roller with the compactness of 75%, 85%, 95% and 99% respectively, wherein the compactness is not less than 33T;
static pressure is carried out by adopting a vibratory roller of not less than 33T until no wheel track exists;
the rolling speed range of the static pressure of the double-steel-wheel roller with the speed not less than 13T is within 1.7km/h, and the rolling speed range of the vibration roller with the speed not less than 26T and the vibration roller with the speed not less than 33T is within 2.0 km/h.
In a preferred embodiment of the present invention, the rolling construction further comprises:
in the rolling process, rolling from the low position of the road to the high position;
in the rolling process, the surface of the mixture on the spreading surface is kept moist, and the water replenishing and sprinkling construction is carried out on the surface of the mixture in time;
in the rolling process, the mixture on the edge of the road is rolled to be compact by adopting a vibratory tamper.
In the preferred embodiment of the invention, the rolling construction further comprises the following steps
And carrying out test detection on the flatness, width, elevation, strength and thickness of the base layer of the rolled road.
In a preferred embodiment of the present invention, the method further comprises the following steps after the test detection:
health preserving and traffic control: after a certain construction section is rolled, curing the construction section;
the health preserving method comprises the following steps: spraying water by using a sprinkler after the paving is finished, and covering the geotextile on the construction section for curing, wherein the period of the curing period is more than 7 days; keeping the surface of the water-stable base layer wet during the curing;
traffic control includes: during the health preserving period, no vehicle is permitted to pass except the sprinkler; and the construction section warns the passing vehicles by adopting a mode of pulling a safety warning belt by using a vertical pile.
In the preferred embodiment of the invention, when the operation of a certain construction section is finished on the same day of construction, a cross joint is arranged on the joint cross section which is started on the next day;
the steps of setting the transverse seam include: tidying the tail end of the mixture with proper water content, placing two square timbers or channel steel close to the mixture, wherein the height of the square timbers or the channel steel is the same as the compaction thickness of the mixture, and leveling the mixture close to the square timbers or the channel steel;
fixing the other side of the square timber or the channel steel, and rolling and compacting the mixture;
before the mixture is spread again, the square timbers or the channel steels are removed, and the top surface of the working surface of the mixture is cleaned to form transverse seams of the mixture.
The invention provides a one-time paving and forming construction method of a cement stabilized base layer, which comprises the following steps: measuring and lofting a road construction area to confirm the paving thickness in the construction area; carrying out primary paving construction on the mixture in the construction area according to the paving thickness, carrying out vibration construction on the side edges of the two sides of the road in the construction area in the paving process, and synchronously operating the vibration construction and the paving construction; because the invention adopts the synchronous construction of paving and the vibration of the side edges at the two sides of the road, the vibration compaction operation of the side edges is synchronously completed in the paving process, so the manual compaction operation of the two sides of the multi-road is not needed after paving, the technical problems that the flatness and the compactness of the two sides of the road cannot be ensured because the two sides of the road are blocked by using the templates in the prior art, the two sides of the road are tamped by using manpower for multiple times, the labor cost is high, the connection defect between two adjacent paving water stabilizing base layers is caused by multiple paving, and the paving efficiency is low are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flow chart of a one-time paving molding construction method for a cement stabilized base layer according to an embodiment of the invention;
fig. 2 is a parameter table of equipment used in rolling construction of the one-time paving and forming construction method for a cement stabilized base layer according to the embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. 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.
As shown in fig. 1-2, the construction method for one-time paving and forming of the water-stable base layer provided in this embodiment includes the following steps: measuring and lofting a road construction area to confirm the paving thickness in the construction area; and carrying out primary paving construction on the mixture in the construction area according to the paving thickness, carrying out vibration construction on the side edges of the two sides of the road in the construction area in the paving process, and synchronously operating the vibration construction and the paving construction.
In this embodiment, with the increase of the paving thickness of the cement stabilized base layer, in order to ensure the initial paving compactness and the final compactness, the vibration frequency of the screed of the paver, the vibration level of the ram of the paver, the tonnage of the road roller, the amplitude of the road roller and the vibration level of the road roller need to be reselected, and the corresponding proper frequency and vibration level are selected for roads with different paving thicknesses, so as to ensure the final compaction quality of the cement stabilized base layer.
Optionally, in this embodiment, for the cement-stabilized gravel layer, for the construction method of one-step paving and molding, preferably, a creep RP953T paver may be used as the paver, the maximum paving width is 12 meters, when the roadbed in the road construction area is qualified, the cement-stabilized gravel base layer construction is performed, and before paving, the lower bearing layer should be sprayed with water and pre-wetted; in addition, it should be noted that, since the paver belongs to the conventional equipment in the field, the structure of the paver is not described herein again.
The specific process of one-step paving molding comprises the following steps: at the spreading starting point, the screed of the spreading machine is lifted and placed in balance to meet the requirement of virtual spreading thickness, then the screed is dropped down, the running condition of the stirring wheel and the sensitivity of the sensor are checked, and the normal running of the machine is ensured. In addition, the two sides of the screed plate of the paver are provided with the vibrating striker plate and a power device for providing vibrating force for the vibrating striker plate so as to realize template-free one-time paving and edge vibrating synchronous forming construction of the cement stabilized base layer; wherein, the electric power of the paving construction and the vibrating construction adopts the power of the paving machine; when the automatic paving is started, when the paving progress reaches 1m approximately, the paving thickness is detected through a pull wire, and if the paving thickness has deviation, the automatic leveling instrument is finely adjusted to reduce or thicken the paving thickness until the paving thickness reaches an ideal thickness; before paving, at least 2-3 transport vehicles are needed to wait for unloading so as to ensure continuous and uniform paving; the bucket lifting angle of the transport vehicle is required to be as large as possible during unloading, so that the mixture is integrally collapsed, and segregation during unloading is avoided; when in paving, the uniform and continuous running paving is ensured as much as possible, the pause is avoided as much as possible, and the transport vehicle is kept continuous as much as possible when backing and unloading, so that the condition of stopping paving and waiting materials is not caused; the material level in a material storage chamber of the paver is kept stable, and the embedding depth of the inner screw of the material storage chamber is at least ensured to be 2/3 or more so as to avoid influencing the flatness of a base layer; in the paving process, instruments are observed on two sides of a paving line at any time to ensure the elevation, and meanwhile, the height is measured at any time by adopting a pull line so as to be adjusted in time to ensure the paving elevation, and the wavy surface is required to be avoided in the paving process; in addition, when the coarse aggregate 'nest' and the coarse aggregate 'belt' appear, the newly mixed uniform mixture is supplemented.
The one-time paving and forming construction method for the cement stabilized base layer provided by the embodiment comprises the following steps: measuring and lofting a road construction area to confirm the paving thickness in the construction area; carrying out primary paving construction on the mixture in the construction area according to the paving thickness, carrying out vibration construction on the side edges of the two sides of the road in the construction area in the paving process, and synchronously operating the vibration construction and the paving construction; because the invention adopts the synchronous construction of paving and the vibration of the side edges at both sides of the road, the vibration compacting operation of the side edges is synchronously completed in the paving process, so the manual compacting operation of both sides of the multi-road is not needed after paving, the technical problems that the flatness and compactness of both sides of the road cannot be ensured because both sides of the road are blocked by using the template in the prior art, the manual compacting operation of both sides of the road is simultaneously carried out for a plurality of times, the labor cost is high, the connection defect between two adjacent paving water-stabilizing base layers is caused by a plurality of pavements, and the paving efficiency is low are solved.
In a preferred embodiment of the present invention, the vibrating construction comprises the steps of: the method comprises the following steps of carrying out primary paving construction on a mixture in a construction area by utilizing a paver, arranging a vibrating plate and a vibrator on two sides of an ironing plate of the paver, wherein the vibrator is in transmission connection with the vibrating plate, the vibrating plate is in sliding connection with two sides of the ironing plate, and the vibrator is used for driving the vibrating plate to reciprocate along the extending direction of the ironing plate so as to vibrate and compact the mixture on two sides of a road through the vibrating plate; wherein the paving width range of the screed plate of the paver is 0-12 m.
In the embodiment, two vibrating plates are arranged, and the two vibrating plates and the screed plate of the paver form a half-frame structure, wherein the two vibrating plates are in sliding connection with the screed plate, and when the vibrator drives the vibrating plates to reciprocate along the extending direction of the screed plate, the vibrating plates can gradually move towards the two sides of a paved road, so that the two sides of the road can be vibrated to be dense; meanwhile, the vibrating plate is connected with the ironing plate, so that the vibrating plate can synchronously move in the paving process of the ironing plate, and the paving and vibrating synchronous motion is realized.
The connection mode of the vibrating plate and the ironing plate can be various, for example: the sliding groove and the sliding rail are adopted for sliding connection, or the sliding groove and the roller can be used for reciprocating motion; furthermore, a limiting plate can be arranged on the screed plate, and the limiting plate can limit the distance between the two vibrating plates, so that the limiting plates at different positions are arranged for limiting aiming at different paving road constructions; optionally, the vibrator is used as a moving device for driving the vibrating plate, and the vibrator can vibrate the vibrating plate to densify the two sides of the road through the vibrating plate; in addition, the vibrating plate can be connected with a hydraulic cylinder, and the reciprocating motion of the vibrating plate relative to the ironing plate is driven by the reciprocating motion of the hydraulic cylinder.
In a preferred embodiment of the present invention, the step of performing measurement lofting on the road construction area further comprises: in the construction process, the construction layout of hanging lines in construction areas on two sides of a road is adopted: a plurality of supporting rods are arranged outside the line edge of an area needing paving, and the supporting rods are arranged at equal intervals; and determining the steel wire elevation according to the paving thickness of the cement stabilized base layer and the position of a sensor of the paver, hanging steel wires among a plurality of supporting rods, and paving after confirming that the supporting rods are checked to be correct with the reference steel wire frame elevation, wherein the deflection of the steel wires is less than 2 mm.
Specifically, before the paving is started, measurement lofting is carried out one day in advance, and the positions of 3m, 6m and 9m are respectively paid out by using a steel ruler according to the cross section and the actual elevation is measured by installing middle piles and side piles in a road construction area and paying out control points at the two sides of the road so as to calculate the loose pavement thickness and the compaction coefficient; the whole-width full-thickness paving is carried out by adopting a standard steel wire method and a paver in the paving process. In the construction process, hanging line construction layout on the left side and the right side of a road is adopted, a plurality of supporting rods are driven into the position 50cm outside the edge of a paving line, preferably, the distance between any two supporting rods is 10m, the steel wire elevation is determined according to the paving thickness of a cement stabilized base layer and the position of a sensor of a paver, wherein the deflection of a steel wire rope is smaller than 2mm, and paving is started after the supporting rods are checked to be correct with the reference steel wire frame elevation. Optionally, in the paving process, a person needs to be arranged to check back and forth on the site to prevent the vehicle, the constructor and other machines from colliding with the supporting rods and the steel wires; the flatness of the roadbed can be better improved by using a 'reference steel wire method', so that the construction is more convenient.
Optionally, the paving construction step further comprises the following steps: stirring the mixture, and transporting the mixture to a construction area; wherein the cement dosage of the mixture is 5.0 percent, the water content of the mixture is 5.3 to 6.3 percent, and the maximum dry density is 2.352g/m3(ii) a The transport time of the stirred mixture is less than 2 hours.
In this embodiment, a WDD600 water-stabilized mixing station may be utilized, which may produce a yield of 300m per hour3(ii) a The cement dosage of the mixture is 5.0 percent, the optimal water content is 5.3 percent, and the maximum dry density is 2.352g/m3(ii) a Before the mixture is stirred, the natural water content of the original material needs to be detected, and the mixing proportion of the material is calculated, so that the sum of the externally added water and the natural water content of the material is equal to the optimal water content; in addition, the water content of 0-1% can be properly increased according to the loss of the transportation water and the influence of weather under different conditions, and the change of the water content can be timely adjusted along with the change of the temperature; after mixing is started, whether the proportion and the water content of the raw materials meet the design mixing proportion requirement or not is checked during discharging, and if the proportion and the water content of the raw materials do not meet the design mixing proportion requirement, a metering system of mixing equipment is corrected in time until the requirement is met.
In the transportation process, the number of transportation vehicles needs to be determined according to the distance from the mixing station to a construction site, and the selection of the transportation vehicles needs to meet the requirement of not influencing site construction; the discharging opening of a finished product bin of the mixer needs to be not more than 50cm from the top of a cargo box of a transport vehicle, a funnel of the mixer needs to be loaded and transported after storing materials for a certain time, and the vehicle needs to move back and forth during loading so as to load the vehicle in front, back and middle three times, so that the mixture can be prevented from being separated in the vehicle; when the transport vehicle leaves the factory, canvas is adopted for covering, and the tying rope is tied firmly to prevent the canvas from being lifted and reduce the loss of water; filling a delivery order when the transport vehicle leaves the field, and marking the number, the tonnage and the delivery time of the vehicle; filling the vehicle-arriving time after arrival to calculate the time of the vehicle-arriving time of the mixture, and discarding the mixture exceeding 2 hours; when the transport vehicle unloads, the transport vehicle stops 10 cm-30 cm in front of the paver, the paver pushes the transport vehicle to unload while advancing, and the unloading speed and the paving speed are coordinated.
In a preferred embodiment of the present invention, the paving step further comprises the following steps: carrying out rolling construction on the paved construction area; wherein, the rolling construction step comprises primary static pressure construction, vibration construction and secondary static pressure construction.
In a preferred embodiment of the present invention, the rolling construction further comprises: static pressure of a double-steel-wheel road roller of not less than 13T is adopted for one time, and the compactness is 20%; weak vibration is carried out once and strong vibration is carried out four times by adopting a road roller with the vibration of not less than 26T, and the compaction degrees are respectively 30%, 40%, 50% and 65%; carrying out strong vibration construction on the base layer for four times by adopting a vibratory roller with the compactness of 75%, 85%, 95% and 99% respectively, wherein the compactness is not less than 33T; static pressure is carried out by adopting a vibratory roller of not less than 33T until no wheel track exists; the rolling speed range of the static pressure of the double-steel-wheel roller with the speed not less than 13T is within 1.7km/h, and the rolling speed range of the vibration roller with the speed not less than 26T and the vibration roller with the speed not less than 33T is within 2.0 km/h.
In a preferred embodiment of the present invention, the rolling construction further comprises: in the rolling process, rolling from the low position of the road to the high position; in the rolling process, the surface of the mixture on the spreading surface is kept moist, and the water replenishing and sprinkling construction is carried out on the surface of the mixture in time; in the rolling process, the mixture on the edge of the road is rolled to be compact by adopting a vibratory tamper.
Optionally, when the rolling construction is carried out by adopting a road roller, the road roller is not accurate in left-right swinging during rolling, is not accurate in frequent change of rolling speed, needs to be staggered into a step shape of about 2 meters during reversing, is overlapped for 1/2 wheel widths during rolling, and returns according to the original path during reversing; the road roller needs to be started lightly and slowly, and the turning or sudden braking is strictly prevented; the position of the road roller folded from two ends is pushed forward along with the paver in a stepped manner each time, so that the folded positions are not on the same cross section, and the vibration of the vibratory road roller is closed when the vibratory road roller runs on a formed base layer; in the process of rolling the road roller back and forth, the road roller needs to ensure the same vibration frequency so as not to influence the flatness; the mixture at the edge can be rolled to be compact by adopting a small-sized vibratory tamper again in the rolling process so as to ensure the rolling quality of the edge, and the surface of the mixed material is smooth until no obvious wheel trace exists.
In a preferred embodiment of the invention, the rolling construction further comprises the following steps of carrying out test detection on the flatness, width, elevation, strength and thickness of the base layer of the rolled road.
Wherein, the test detection method can adopt a 7d unconfined compression resistance and coring method to detect the strength and the thickness; the unconfined compressive strength test is a special case of a triaxial test, namely a pressure test is carried out on a soil sample under the condition that the soil sample is not limited laterally, at the moment, the small main stress borne by the soil sample is 0, and the limit value of the large main stress is the unconfined compressive strength.
In a preferred embodiment of the present invention, the method further comprises the following steps after the test detection: health preserving and traffic control: after a certain construction section is rolled, curing the construction section; the health preserving method comprises the following steps: spraying water by using a sprinkler after the paving is finished, and covering the geotextile on the construction section for curing, wherein the period of the curing period is more than 7 days; keeping the surface of the water-stable base layer wet during the curing; traffic control includes: during the health preserving period, no vehicle is permitted to pass except the sprinkler; and the construction section warns the passing vehicles by adopting a mode of pulling a safety warning belt by using a vertical pile.
Specifically, spraying water by using a watering cart after paving, and then covering the geotextile for curing, wherein the curing period is not less than 7 days; wherein, the number of watering times per day is determined according to the climate, and the surface of the cement stable gravel layer is kept wet all the time during the whole curing period.
The traffic control can be realized by arranging traffic warning road cones every 10m along the construction section, and arranging safety warning signs 50 m at the two ends of the construction section.
In the preferred embodiment of the invention, when the operation of a certain construction section is finished on the same day of construction, a cross joint is arranged on the joint cross section which is started on the next day; the steps of setting the transverse seam include: tidying the tail end of the mixture with proper water content, placing two square timbers or channel steel close to the mixture, wherein the height of the square timbers or the channel steel is the same as the compaction thickness of the mixture, and leveling the mixture close to the square timbers or the channel steel; fixing the other side of the square timber or the channel steel, and rolling and compacting the mixture; before the mixture is spread again, the square timbers or the channel steels are removed, and the top surface of the working surface of the mixture is cleaned to form transverse seams of the mixture.
Optionally, when the material breaking time exceeds 2 hours in the paving process and the transverse joint is not processed according to the method, the mixture which is not compacted near the paver and under the paver is shoveled, the tail end which is compacted and has the required height and flatness is dug into a section which is vertical to the central line of the road and vertically faces downwards, and then new mixture is paved again.
It should be noted that the embodiment has a better economic benefit, and engineering practice proves that in the construction process of paving a road with a width of 11.5m and a paving thickness of 32cm, the paving cost is calculated by 10h-12h each day to generate monthly cost: the mechanical cost is 44.3 ten thousand yuan, the construction length is 0.35km per day, and the total cost of the health maintenance materials and the labor is 73 ten thousand yuan per 28.7 ten thousand yuan. And the adoption of two layers of spreading months generates cost: the mechanical cost is 53.3 ten thousand yuan, the construction length is 0.8km per day, and the total cost of the health maintenance materials and the labor cost is 25.4 ten thousand yuan, which is 78.7 ten thousand yuan. Through the contrast to the two paving modes, the one-time paving and forming construction method for the cement stabilized base layer provided by the embodiment has the advantages that compared with the traditional two-layer paving scheme, the maintenance time is saved, the tensile strength and the impact strength of the base layer can be improved, the diseases such as early sinking, cracking and the like of the pavement can be effectively avoided, and in economic terms, 40.4 ten thousand yuan can be saved according to the whole construction period.
In addition, compared with the conventional method for building the cement stabilized base layer by using the vertical mold in the prior art, the method for one-time paving and forming of the cement stabilized base layer provided by the embodiment does not use a baffle plate to perform side edge blocking, 6 workers are reduced for each shift of one-time paving and forming technology, 4 hours of template transfer machinery are reduced, the cost is saved by about 4 yuan per linear meter by primarily measuring and calculating the paving time per day according to 800 meters, and the cost which can be saved per day is 4 × 800 ═ 3200 yuan. Because no baffle is needed, the labor intensity of workers is reduced, the mechanical people changing can be realized, and the safety of construction and production is ensured; the problem of preliminary compaction of the water-stable paved side slope is solved, and the water-stable base layer side slope vibrating device can be used for preliminarily vibrating the paved water-stable base layer, so that preliminary compaction of the paved water-stable base layer side slope is ensured, and preparation is made for subsequent side compaction; the integrity of the roadbed and the flatness of the base layer are improved, and the method is suitable for popularization and application.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The one-time paving and forming construction method of the cement stabilized base layer is characterized by comprising the following steps of:
measuring and lofting a road construction area to confirm the paving thickness in the construction area;
and carrying out primary paving construction on the mixture in the construction area according to the paving thickness, carrying out vibration construction on the side edges of the two sides of the road in the construction area in the paving process, and synchronously operating the vibration construction and the paving construction.
2. The one-time paving and forming construction method for the water-stable base layer according to claim 1, wherein the vibrating construction step comprises the following steps: utilize the paver to carry out the construction that once paves of mixture in the construction area, the both sides of the screed of paver are provided with vibrating plate and vibrator, and the vibrator is connected with the vibrating plate transmission, and the vibrating plate carries out reciprocating motion along the extending direction of screed with the both sides sliding connection of screed, vibrator to the mixture of road both sides carries out the vibration closely knit through the vibrating plate.
3. The one-time paving and forming construction method for the cement stabilized base layer as claimed in claim 1, wherein the step of measuring and lofting the road construction area further comprises:
in the construction process, the construction layout of hanging lines in construction areas on two sides of a road is adopted: a plurality of supporting rods are arranged outside the line edge of an area needing paving, and the supporting rods are arranged at equal intervals; and determining the steel wire elevation according to the paving thickness of the cement stabilized base layer and the position of a sensor of the paver, hanging steel wires among a plurality of supporting rods, and paving after confirming that the supporting rods are checked to be correct with the reference steel wire frame elevation, wherein the deflection of the steel wires is less than 2 mm.
4. The one-time paving and forming construction method for the water-stable base layer according to any one of claims 1-3, characterized by further comprising the following steps before the paving construction step:
stirring the mixture, and transporting the mixture to a construction area;
wherein the cement dosage of the mixture is 5.0 percent, the water content of the mixture is 5.3 to 6.3 percent, and the maximum dry density is 2.352g/m3；
The transport time of the stirred mixture is less than 2 hours.
5. The one-time paving and forming construction method for the cement stabilized base layer as claimed in claim 4, characterized in that the following steps are included after the paving construction step:
carrying out rolling construction on the paved construction area;
wherein, the rolling construction step comprises primary static pressure construction, vibration construction and secondary static pressure construction.
6. The one-time paving and forming construction method for the cement stabilized base layer as claimed in claim 5, wherein the step of rolling construction further comprises:
static pressure of a double-steel-wheel road roller of not less than 13T is adopted for one time, and the compactness is 20%;
weak vibration is carried out once and strong vibration is carried out four times by adopting a road roller with the vibration of not less than 26T, and the compaction degrees are respectively 30%, 40%, 50% and 65%;
carrying out strong vibration construction on the base layer for four times by adopting a vibratory roller with the compactness of 75%, 85%, 95% and 99% respectively, wherein the compactness is not less than 33T;
static pressure is carried out by adopting a vibratory roller of not less than 33T until no wheel track exists;
the rolling speed range of the static pressure of the double-steel-wheel roller with the speed not less than 13T is within 1.7km/h, and the rolling speed range of the vibration roller with the speed not less than 26T and the vibration roller with the speed not less than 33T is within 2.0 km/h.
7. The one-time paving and forming construction method for the cement stabilized base layer as claimed in claim 6, wherein the step of rolling construction further comprises:
in the rolling process, rolling from the low position of the road to the high position;
in the rolling process, the surface of the mixture on the paving surface is kept moist, and water replenishing and sprinkling construction is carried out on the surface of the mixture in time;
in the rolling process, the mixture on the edge of the road is rolled to be compact by adopting a vibratory tamper.
8. The one-time paving and forming construction method for the cement stabilized base layer as claimed in claim 5, wherein the rolling construction further comprises the following steps
And carrying out test detection on the flatness, width, elevation, strength and thickness of the base layer of the rolled road.
9. The one-time paving and forming construction method for the cement stabilized base layer as claimed in claim 8, characterized by further comprising the following steps after test detection:
health preserving and traffic control: after a certain construction section is rolled, curing the construction section;
the health preserving method comprises the following steps: spraying water by using a sprinkler after the paving is finished, and covering the geotextile on the construction section for curing, wherein the period of the curing period is more than 7 days; keeping the surface of the water-stable base layer wet during the curing;
traffic control includes: during the health preserving period, no vehicle is permitted to pass except the sprinkler; and the construction section warns the passing vehicles by adopting a mode of pulling a safety warning belt by using a vertical pile.
10. The one-time paving and forming construction method for the water-stable base layer as claimed in claim 4, wherein when the operation of a certain construction section is finished on the same day of construction, a cross joint is arranged on the joint section which is started on the next day;
the steps of setting the transverse seam include: tidying the tail end of the mixture with proper water content, placing two square timbers or channel steel close to the mixture, wherein the height of the square timbers or the channel steel is the same as the compaction thickness of the mixture, and leveling the mixture close to the square timbers or the channel steel;
fixing the other side of the square timber or the channel steel, and rolling and compacting the mixture;
before the mixture is spread again, the square timbers or the channel steels are removed, and the top surface of the working surface of the mixture is cleaned to form transverse seams of the mixture.
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Effective date of registration: 20201113 Address after: 100024 Beijing, Guanzhuang, Chaoyang District, Zhou Applicant after: CHINA FIRST HIGHWAY ENGINEERING Co.,Ltd. Applicant after: HAIWEI ENGINEERING CONSTRUCTION CO LTD OF FIRST HIGHWAY ENGINEERING Co.,Ltd. OF CCCC Address before: 101100 Beijing City, Tongzhou District Road No. 568 Building No. 1 Xu Applicant before: HAIWEI ENGINEERING CONSTRUCTION CO LTD OF FIRST HIGHWAY ENGINEERING Co.,Ltd. OF CCCC |
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Application publication date: 20200515 |