CN111172849A - Full-width seamless integral forming asphalt paving method for old road extension - Google Patents

Full-width seamless integral forming asphalt paving method for old road extension Download PDF

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Publication number
CN111172849A
CN111172849A CN202010058739.3A CN202010058739A CN111172849A CN 111172849 A CN111172849 A CN 111172849A CN 202010058739 A CN202010058739 A CN 202010058739A CN 111172849 A CN111172849 A CN 111172849A
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CN
China
Prior art keywords
paving
segregation
asphalt
full
old
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Pending
Application number
CN202010058739.3A
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Chinese (zh)
Inventor
吕思忠
刘甲荣
苏建明
王凯
綦开隆
姚怀新
李伟
孙雪妮
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Shaanxi Zhongda Liding Technology Co ltd
Shandong Hi Speed Co Ltd
Original Assignee
Shaanxi Zhongda Liding Technology Co ltd
Shandong Hi Speed Co Ltd
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Publication date
Application filed by Shaanxi Zhongda Liding Technology Co ltd, Shandong Hi Speed Co Ltd filed Critical Shaanxi Zhongda Liding Technology Co ltd
Priority to CN202010058739.3A priority Critical patent/CN111172849A/en
Publication of CN111172849A publication Critical patent/CN111172849A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/48Machines, 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
    • E01C19/488Machines, 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 rollers for consolidating or finishing combined with tamping, vibrating, pressing or smoothing consolidation or finishing means

Abstract

The invention provides a full-width seamless integrally-formed asphalt paving method for old road extension, which adopts an anti-segregation paver to pave an old road and a new road simultaneously to form a straight slope structure, respectively adjusts the discharge amount of two spiral pavers according to the paving thickness difference of the old road and the new road in the asphalt paving process, and adjusts the main vibration amplitude and the auxiliary vibration amplitude of the anti-segregation paver to ensure that the transverse compactness is uniform and consistent, thereby realizing the full-width seamless integrally-formed asphalt pavement. Compared with the prior process of paving a plurality of pavers in parallel, the process solves the problems of different elevations of new and old pavements, different settlement of old pavements and poor transverse and longitudinal flatness in the reconstruction and extension projects of the expressway. The method has the advantages that the truly-significant horizontal straight slope and longitudinal seamless reconstruction and expansion of the expressway are created, the original design purpose of the horizontal straight slope of the cross section is realized, and the paved road surface is smooth in drainage, comfortable in driving, safe, durable and capable of utilizing resources. High efficiency and high quality.

Description

Full-width seamless integral forming asphalt paving method for old road extension
Technical Field
The invention belongs to the technical field of road construction, and particularly relates to a full-width seamless integral forming asphalt paving method for old road extension.
Background
In the expressway reconstruction and extension projects, all four-to-eight reconstruction and extension projects are designed to adopt a straight slope structure, and because the traditional paver is seriously separated along with the increase of the width, a process of paving a plurality of pavers in parallel is not needed, so that longitudinal seams appear as a result, and the realization of the straight slope cannot be ensured.
Because the new and old road surfaces are different in elevation, the old road surfaces are different in settlement, and the transverse and longitudinal flatness is poor, and the parallel machine is paved to cause the problems of multiple transverse slopes and multiple camber of the road surfaces, accumulated rainwater in rain and vehicle lane change and shake.
Disclosure of Invention
The invention aims to provide a full-width seamless integrally-formed asphalt paving method for old road extension, which solves the technical problems of multiple cross slopes and multiple arches of a road surface, rainwater accumulation and vehicle lane change shake caused by parallel paving.
Therefore, the technical scheme provided by the invention is as follows:
a full-width seamless integral forming asphalt paving method for old road extension is characterized in that an anti-segregation paver is adopted to pave an old road and a new road simultaneously to form a straight slope structure, in the asphalt paving process, the discharge amount of two spiral pavers is respectively adjusted according to the paving thickness difference of the old road and the new road, and the main vibration amplitude and the auxiliary vibration amplitude of the anti-segregation pavers are adjusted to enable the transverse compactness to be uniform, so that a full-width seamless integral forming asphalt pavement is realized;
wherein, anti-segregation paver includes the flexible ironing device of segregation is prevented to multistage telescopic, the flexible ironing device of segregation is prevented to multistage telescopic includes truss and screed, the truss is connected with the screed, the flexible ironing device of segregation is prevented to multistage telescopic is used for realizing that pitch paving process forms horizontal word slope structure.
The process of respectively adjusting the discharge amount of the two material conveying grooves according to the paving thickness difference of the old road and the new road is as follows: the diameters and the screw pitches of the helical blades of the two helical pavers are respectively adjusted, the multi-point joint control material level device of the anti-segregation paver adjusts the helical rotating speed according to the material level height of the monitoring position of each material level device, and the materials are evenly, continuously and stably conveyed through the two helical pavers.
And in the asphalt paving process, adjusting the main vibration amplitude and the auxiliary vibration amplitude of the anti-segregation paver according to the paving thickness and the initial compactness.
The straight slope structure comprises a flat slope, an ascending slope and a descending slope without longitudinal seams.
The two spiral pavers are semi-closed spiral pavers, and in the asphalt paving process, the materials are fully buried with spirals and are stirred for the second time.
The method also comprises the step of stopping the joint, and after the joint is stopped every time, the cross section is leveled by a shovel.
The paving thickness differences include a transverse paving thickness difference and a longitudinal paving thickness difference.
The paving width of the segregation-resistant paver can reach 23 m.
The full-width longitudinally-seam-free integrally-formed asphalt pavement is an asphalt surface layer, an asphalt base layer or an asphalt subbase layer.
The invention has the beneficial effects that:
the invention provides a full-width seamless integral forming asphalt paving method for old road extension, which adopts an anti-segregation paver to pave the old road and the new road simultaneously, and compared with the prior process of paving a plurality of pavers in parallel, solves the problems of different heights of the new road and the old road, different settlement of the old road and poor transverse and longitudinal flatness of the new road and the old road in the highway extension engineering.
The asphalt paving method can be used for constructing a transverse straight slope and a longitudinal seamless reconstruction and extension expressway with real significance, realizes the original design of the cross section straight slope, ensures that the paved road surface is smooth in drainage, comfortable in driving, safe, durable and capable of utilizing resources.
The asphalt paving method has high efficiency and good quality, does not need manual material supplement and manual material spreading on the road surface, and saves equipment, oil and manpower.
In order to make the aforementioned and other aspects of the present invention more comprehensible, preferred embodiments are described in detail below.
Drawings
Fig. 1 is a schematic view of the structure of an anti-segregation paver;
fig. 2 is a schematic structural diagram of the screw paver.
In the figure:
description of reference numerals:
1. a receiving hopper; 2. a screw spreader 2; 3. a scraper conveyor; 4. a multi-stage telescopic segregation-preventing telescopic ironing device; 5. pushing the roller; 6. a power transmission system.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the invention to those skilled in the art. The terminology used in the description of the exemplary embodiments is not intended to be limiting of the invention.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1:
in order to solve the technical problems of multiple transverse slopes and multiple camber of the road surface, rainwater accumulation and vehicle lane change shaking caused by parallel paving in the prior art in the expressway reconstruction and expansion project, the embodiment provides a full-width seamless integrally-formed asphalt paving method for old road expansion, an anti-segregation paver is adopted to pave the old road and the new road simultaneously to form a straight slope structure, in the asphalt paving process, the discharge amount of two spiral pavers 2 is respectively adjusted according to the paving thickness difference of the old road and the new road, and the main vibration amplitude and the auxiliary vibration amplitude of the anti-segregation pavers are adjusted to ensure that the transverse compactness is uniform, so that the full-width seamless integrally-formed asphalt road surface is realized;
wherein, anti-segregation paver includes multistage telescopic anti-segregation flexible ironing device 4, multistage telescopic anti-segregation flexible ironing device 4 includes truss and screed, the truss is connected with the screed, multistage telescopic anti-segregation flexible ironing device 4 is used for realizing that pitch paving process forms horizontal word slope structure.
The principle of the invention is as follows:
before paving, the ironing plate is integrally leveled and stable by adjusting the truss, and the transverse straight slope of the paved road surface can be ensured. The multistage telescopic anti-segregation telescopic ironing device 4 of the anti-segregation paver not only can be adjusted according to the paving width, but also can avoid segregation along with the increase of the width due to secondary forced stirring, and meanwhile, the anti-segregation paver can also settle differently according to the old road, so that the material consumption is adjusted. The invention can dynamically change the paving width without longitudinal seam and the whole width of paving, avoids the separation of the joint of the parallel machine and the temperature separation, ensures the pavement to be uniformly paved and ensures the flatness after compaction and after traffic.
Example 2:
the embodiment provides a full-width seamless integral forming asphalt paving method for old road extension, which is characterized in that an anti-segregation paver is adopted to pave an old road and a new road simultaneously to form a straight slope structure, in the asphalt paving process, the discharge amount of two spiral pavers 2 is respectively adjusted according to the paving thickness difference of the old road and the new road, and the main vibration amplitude and the auxiliary vibration amplitude of the anti-segregation paver are adjusted to ensure that the transverse compactness is uniform, so that the full-width seamless integral forming asphalt pavement is realized;
the process of respectively adjusting the discharge amount of the two material conveying grooves according to the paving thickness difference of the old road and the new road is as follows: the diameters and the screw pitches of the helical blades of the two helical pavers 2 are respectively adjusted, the multi-point joint control material level device of the anti-segregation paver adjusts the helical rotating speed according to the material level height of the monitored position of each material level device, and the materials are evenly, continuously and stably conveyed through the two helical pavers 2;
wherein, anti-segregation paver includes multistage telescopic anti-segregation flexible ironing device 4, multistage telescopic anti-segregation flexible ironing device 4 includes truss and screed, the truss is connected with the screed, multistage telescopic anti-segregation flexible ironing device 4 is used for realizing that pitch paving process forms horizontal word slope structure.
For the four-to-eight reconstruction and extension project, the elevation of a new road surface and the settlement of each lane of an old road surface are detected before paving. The elevation and the sedimentation of the new and old road surfaces are different, the difference of the transverse and longitudinal paving thickness is large, so that the material consumption of the unit area is different when the paving thicknesses are different. The spiral rotating speed is calculated, processed and intelligently adjusted through the multipoint joint control material level devices according to the height data of the material level at the monitoring position of each material level device, and the diameter and the pitch of the spiral blade are adjusted by an operator according to different paving material amounts, so that the spiral is ensured to run uniformly and continuously all the time.
According to the reality of different cross section materials (different heavy lanes, lanes and emergency lanes are settled), the density of the spiral diameter (480, 420, 360, 320, 280) and the pitch (280, 420, 560) is adjusted.
Example 3:
on the basis of embodiment 1, this embodiment provides a full-width seamless integrally-formed asphalt paving method for old road extension, in the asphalt paving process, the main vibration amplitude and the auxiliary vibration amplitude of the anti-segregation paver are adjusted according to the paving thickness and the initial compactness.
Aiming at the different elevations and the different paving thicknesses of the new and old road surfaces to be paved, the main vibration amplitude and the auxiliary vibration amplitude are adjusted according to the paving thicknesses of all the sections, and the old road settlement belt is provided with a plurality of filling materials and is tamped by force so as to ensure the flatness after compaction and after traffic is opened.
And for the 'four-to-eight' reconstruction and extension project, the elevation and the settlement of the new road surface and the old road surface are different, the transverse paving thickness is different, and the paving initial compactness is different. For the positions with large paving thickness and low initial compactness, the vibration amplitude of the ironing plate is increased by one step; and for the high paving thickness and the initial compactness, the vibration amplitude of the ironing plate is reduced by one level, so that the uniformity of the transverse initial compactness is ensured.
Example 4:
on the basis of embodiment 1, this embodiment provides a full-width seamless integrally-formed asphalt paving method for old road extension, where the two screw pavers 2 are both semi-closed screw pavers, and in the asphalt paving process, the material is fully buried in a screw and the material is stirred for the second time.
The anti-segregation spreader adopts a semi-closed spiral spreader, the material is fully buried in a spiral, and the material is stirred and spread forcibly for the second time. The problem of horizontal, vertical, longitudinal and flaky grading segregation is effectively solved; the problem of paving temperature segregation is effectively solved; effectively solving the problem of spreading compactness segregation; effectively solves the problems of segregation of the unloading pile tip of the mixing plant, segregation of the dumping material of the skip car and segregation of the receiving hopper of the paver.
The method also comprises the step of stopping the joint, and after the joint is stopped every time, the cross section is leveled by a shovel.
The linear slope structure comprises a flat slope, an ascending slope and a descending slope without longitudinal seams. The paving thickness differences include a transverse paving thickness difference and a longitudinal paving thickness difference.
The paving width of the segregation-resistant paver can reach 23 m. The multi-stage telescopic anti-segregation telescopic ironing device 4 guarantees that the dynamic transformation pavement width has no longitudinal seam and the whole pavement, avoids parallel operation seam segregation and temperature segregation.
The asphalt paving method is suitable for paving an asphalt surface course, an asphalt base course or an asphalt subbase course. Paving each layer, and rolling and compacting.
Example 5:
in this embodiment, the economic expressway reconstruction and expansion project is taken as an example, and the asphalt paving method of the invention is adopted to realize a straight slope road surface without longitudinal seams in the true sense.
The full length of the economical expressway is 309 kilometers, an anti-segregation paver is used for paving an old road and a new road simultaneously to form a straight slope structure, in the asphalt paving process, the discharge amount of the two spiral pavers 2 is respectively adjusted according to the paving thickness difference of the old road and the new road, and the main vibration amplitude and the auxiliary vibration amplitude of the anti-segregation pavers are adjusted to ensure that the transverse compactness is uniform and consistent, so that the full-width longitudinally-seam-free integrally-formed asphalt pavement is realized; the anti-segregation paver is adopted to pave the straight slope and the full section without the longitudinal seam, and the original design of the straight slope of the 'four-to-eight' road surface is realized.
In this embodiment, a Power DT2000 type segregation-resistant spreader is used, and a retractable screed plate with a single-side retractable amount of 2.5m is adopted, and the spreading width at the ramp interface is 19.25m and is rapidly changed into the normal width of a main line of 18.75m, and the width is free from strain.
Flatness measurement of the economic high-speed one-standard two-work area: and measuring the whole length of the iron blocks at two sides by taking the iron blocks as elevations and under stay wires at two sides. The mean square error of seven groups of sections is less than 0.30, and the flatness of the upper layer of the oversized-width whole paving with the eight-shaped ' straight slope ' and the no longitudinal seam ' is good.
The flatness of the three-standard three-part K206-K210 section of the high-speed Jiqing pavement with four indexes and eight indexes within the range of 5 kilometers is less than or equal to 0.7mm, the qualification rate is 100%, and the data uniformity is good.
A high-speed 'four-to-eight' five-standard two-work area for the Jiqing survey of a straight slope road surface finished by rolling is characterized in that iron blocks are used as elevations, wires are pulled on two sides, and the distance between the measurement positions below the wires and one meter on the sides is 20cm, the distance between the measurement positions is basically 19.8cm, the distance between the measurement positions is 19.8cm in the middle, the distance between the measurement positions is 20cm in the nine.
The test section of the asphalt surface layer with the width of 18.75 meters is a six-mark Jiqing high-speed test section, eight data of two lanes are measured, the flatness data are 0.442-0.689, the average of one lane is 0.52, and the average of one lane is 0.59.
The invention adopts single machine paving to carry out the four-to-eight improvement and extension of the green-saving expressway, and makes the modernized green expressway with safety, durability, resource utilization, energy conservation, environmental protection and intelligent sharing. In the construction of 18.75 meters wide road surface, the ultra-large paver capable of dynamically changing the paving width is selected from medium and large PowerDT2000 and PowerDT2360 anti-segregation secondary stirring, so that the full-section pavement of 'straight slope and no longitudinal seam' is created for the first time, and the original design of 'four-to-eight' road surface straight slope is realized.
The anti-segregation paver is provided with a truss device with an ultra-large width paving design, and the ironing plate is integrally leveled and stable by adjusting the ironing truss, the support and the pull rod before paving, so that a transverse 'straight slope' of a paved road surface can be ensured; the device comprises a high-power large-torque spiral power device, a fully-buried spiral forced secondary extrusion stirring device, a double-hopper, telescopic and integral-sliding anti-segregation rapid discharging device, a hydraulic auxiliary rear supporting device, a multi-point position material level control system, a multi-stage telescopic anti-segregation telescopic ironing device 4 and a quick opening device (a door hook) for a rear door of a skip car.
The hydraulic door hook device in the main hopper prevents the clamping stagnation of the rear door of the skip car, ensures that the rear door of the skip car is fully opened, and enables the skip car to be lifted in place and quickly unloaded.
Aiming at the difficult problems of different settlement of old roads, large change of material consumption and influence on the material level balance of the spiral paver 2, the invention designs a multipoint control system for the material level of the spiral paver 2 to uniformly, continuously and stably convey materials, and ensures that the pavement is uniformly and smoothly paved.
Aiming at the different elevations and the different paving thicknesses of the new and old road surfaces to be paved, the main vibration amplitude and the auxiliary vibration amplitude are adjusted according to the paving thicknesses of all the sections, and the old road settlement belt is provided with a plurality of filling materials and is tamped by force so as to ensure the flatness after compaction and after traffic is opened.
In the above embodiment, as shown in fig. 1, the scraper conveyer 3 is provided at the bottom of the receiving hopper 1 of the segregation-resistant paver, the scraper conveyer 3 is driven by the power transmission system 6 to operate at a certain rotation speed, so as to continuously and uniformly convey the asphalt mixture in the receiving hopper 1 backwards to the roadbed in the front channel of the screw paver 2, and the screw paver 2 conveys the asphalt mixture transversely to the left and right along the whole paving width of the paver to pave the roadbed. The paved asphalt mixture layer is preliminarily tamped by a vibrating beam of a multi-stage telescopic anti-segregation telescopic ironing device 4, and then is subjected to vibration prepressing, reshaping and ironing again to form a smooth layer with fixed compactness, and finally is finally pressed by a road roller to form a qualified road surface (or a road surface base layer). The screw paver 2 is shown in fig. 2.
In the spreading process, the material-transporting dump truck is always in a neutral position and is pushed by the spreading machine through the pushing roller 5 to synchronously run until all the mixed materials in the truck are completely discharged. And the other material-carrying dump truck immediately drives, repeats the operation and continues to feed materials to the paver, so that the paver carries out paving operation without stopping.
According to the reality of different cross section materials (different heavy lanes, lanes and emergency lanes are settled), the density of the spiral diameter (480, 420, 360, 320, 280) and the pitch (280, 420, 560) is adjusted.
The asphalt paving method is not only used for the extension of old roads, but also suitable for the paving of new roads. Because the new road is paved, the height difference does not exist, a straight slope structure is formed by adopting one anti-segregation paver, in the asphalt paving process, the discharge amount of the two spiral pavers is adjusted to be the same, the main vibration amplitude and the auxiliary vibration amplitude of the anti-segregation pavers are the same, the transverse compactness is uniform, and the full-width longitudinally-seam-free integrally-formed asphalt pavement is realized.
In conclusion, the full-width seamless integral forming asphalt paving method for old road extension provided by the invention adopts one anti-segregation paver to pave the old road and the new road simultaneously, and compared with the existing technology of paving the old roads by a plurality of pavers, the method solves the problems of different heights of the new road and the old road, different settlement of the old road and poor transverse and longitudinal flatness of the old road in the highway extension engineering.
The asphalt paving method can be used for constructing a transverse straight slope and a longitudinal seamless reconstruction and extension expressway with real significance, realizes the original design of the cross section straight slope, ensures that the paved road surface is smooth in drainage, comfortable in driving, safe, durable and capable of utilizing resources.
The asphalt paving method has high efficiency and good quality, does not need manual material supplement and manual material spreading on the road surface, and saves equipment, oil and manpower.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims (9)

1. A full-width seamless integral forming asphalt paving method for old road extension is characterized by comprising the following steps: an anti-segregation paver is adopted to pave the old road and the new road simultaneously to form a straight slope structure, in the asphalt paving process, the discharge amount of two spiral pavers (2) is respectively adjusted according to the paving thickness difference of the old road and the new road, and the main vibration amplitude and the auxiliary vibration amplitude of the anti-segregation paver are adjusted to ensure that the transverse compactness is uniform, so that the full-width longitudinally-seam-free integrally-formed asphalt pavement is realized;
wherein, anti-segregation paver includes multi-stage telescopic prevents flexible ironing device (4) of segregation, multi-stage telescopic prevents flexible ironing device (4) of segregation including truss and screed, the truss is connected with the screed, multi-stage telescopic prevents flexible ironing device (4) of segregation and is used for realizing that pitch paving process forms horizontal word slope structure.
2. The method for paving the full-width seamless integrally formed asphalt for the extension of the old road as claimed in claim 1, wherein the process of respectively adjusting the discharge amount of the two material conveying grooves according to the paving thickness difference of the old road and the new road is as follows: the diameters and the screw pitches of the helical blades of the two helical pavers (2) are respectively adjusted, the multi-point joint control material level device of the anti-segregation paver adjusts the helical rotating speed according to the material level height of each material level device monitoring part, and the materials are evenly, continuously and stably conveyed through the two helical pavers (2).
3. The method of claim 1 for paving a full-width seamless integrally formed asphalt for the extension of old roads, comprising: and in the asphalt paving process, adjusting the main vibration amplitude and the auxiliary vibration amplitude of the anti-segregation paver according to the paving thickness and the initial compactness.
4. The method of claim 1 for paving a full-width seamless integrally formed asphalt for the extension of old roads, comprising: the straight slope structure comprises a flat slope, an ascending slope and a descending slope without longitudinal seams.
5. The method of claim 1 for paving a full-width seamless integrally formed asphalt for the extension of old roads, comprising: the two spiral pavers (2) are semi-closed spiral pavers, and in the asphalt paving process, the materials are fully buried with spirals and are stirred for the second time.
6. The method of claim 1 for paving a full-width seamless integrally formed asphalt for the extension of old roads, comprising: the method also comprises the step of stopping the joint, and after the joint is stopped every time, the cross section is leveled by a shovel.
7. The method of claim 1 for paving a full-width seamless integrally formed asphalt for the extension of old roads, comprising: the paving thickness differences include a transverse paving thickness difference and a longitudinal paving thickness difference.
8. The method of claim 1 for paving a full-width seamless integrally formed asphalt for the extension of old roads, comprising: the paving width of the segregation-resistant paver can reach 23 m.
9. The method of claim 1 for paving a full-width seamless integrally formed asphalt for the extension of old roads, comprising: the full-width longitudinally-seam-free integrally-formed asphalt pavement is an asphalt surface layer, an asphalt base layer or an asphalt subbase layer.
CN202010058739.3A 2020-01-19 2020-01-19 Full-width seamless integral forming asphalt paving method for old road extension Pending CN111172849A (en)

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