CN105064163A - Cement stabilization macadam base layer ultrahigh reverse slope section one-time molding construction method - Google Patents

Abstract

The present invention discloses a cement stabilization macadam base layer ultrahigh reverse slope section one-time molding construction method, which comprises: 1, constructing and placing samples; 2, arranging reference steel wires; 3, adjusting ironing plates on the end heads of a paver; 4, paving; 5, rolling; and 6, curing. According to the cement stabilization macadam base layer ultrahigh reverse slope section one-time molding construction method of the present invention, the longitudinal seam production is effectively avoided, the whole hardening property, the stability and the mechanical strength of the base layer and the road shoulder are ensured; the continuous operation is performed so as to accelerate the construction schedule and save the cost; the mechanization operation degree is high, and the process is clear; the base layer molding surface is beautiful and consistent, and the appearance is good; the detection frequency is decreased so as to correspondingly reduce the labor intensity of the worker; and the assurance is provided for the continuity, the integrity and the uniformity of the next process layer permeation spreading.

Description

One-time forming construction method of cement-stabilized macadam base for super high reverse slope section

technical field

The invention relates to a construction method, in particular to a one-time forming construction method for a super-high reverse slope section of a cement-stabilized gravel base.

Background technique

The superelevation section of the conventional pavement base has a one-sided slope, that is, the road surface is consistent with the cross slope at the shoulder. Road mixing and grader leveling construction techniques can be used, or field mixing and paver with a higher degree of mechanization can be used. paving construction process. However, in some highway constructions, the designed pavement of the superelevation section is not consistent with the cross slope of the road shoulder, which is commonly known as "reversed slope". Conventional construction methods generally use pavement and road shoulders separately, that is, pavement construction with a relatively high degree of mechanization, and then manual and mechanical construction of the road shoulders. Because the road shoulder of this project is only 1.5 meters wide, the construction scope is narrow, and the mixing and leveling work needs to be completed manually. Not only is the progress slow, but this method also involves multiple longitudinal seams, and the quality is not very good. Aiming at the problems existing in the existing construction scheme, the present invention proposes a one-time forming construction method for the ultra-high reverse slope section of the cement-stabilized crushed stone base.

Contents of the invention

The technical problem to be solved by the present invention is to provide a cement-stabilized macadam base layer super-high reverse slope section one-time forming construction method, which solves the construction problem of one-time forming super-high reverse slope section of the base.

The cement-stabilized macadam base layer ultra-high reverse slope section one-time forming construction method provided by the present invention, the construction steps are as follows:

The first step, construction stakeout;

Determine the chainage of the superelevation section, and mark the critical point for the stakeout where the straight section enters the curved section and the curved section enters the straight section;

The second step is to arrange the baseline steel wire;

On the edge of the middle pile and the inner edge of the road shoulder, the elevation control pile is placed, and the elevation is controlled by hanging wires on both sides. Support piles are installed on both sides of the road. Tighten with a tensioner every 100-150 meters, and the tension is 8-10KN;

The third step is to adjust the screed at the end of the paver;

The carriageway is 6.5 meters, and the two sides of the shoulder are 1.5 meters. The superelevation section of the main lane is changed between 3% and 4%. According to the technical parameters of the road, the adjustable 1.5-meter screed is assembled at both ends of the paver , with a fixed 6.5-meter screed in the middle, with a total length of 9.5 meters. According to the minimum transverse slope of the main driveway of 3% and the elevation requirements, the bottom plate and tamper of the 1.5-meter screed are processed into a geometric relationship consistent with it;

The fourth step, paving;

Double-side longitudinal slope sensors are used to improve the sensing accuracy. The slider detector on the sensor is located on the datum and placed 30-50cm in front of the screed; before paving, the sub-base is sprinkled with water to check the operation of each part of the paver. Adjust the width of the screed, and adjust the height according to the thickness of the base layer, pad the square wood, and then place it at the position to be paved, so that the vibrating hammer is pressed against the edge of the square wood, 2-5cm away from the edge, and the screed is in a floating state. Good oil level and scale, then cloth, use the same direction of the spiral blades on the left and right sides when paving on the cross slope;

The fifth step, rolling;

The rolling is followed by the paver, and the roadway is paved at a distance of 50 meters with a 14T vibratory roller. The shoulder of the ultra-high reverse slope section is closely followed by the paver, and the manual vibratory roller is used for rolling;

The straight line section is rolled from both sides to the center, and the curved section is rolled from the inside to the outside. When rolling, the longitudinal overlap is not less than 0.4m, and the horizontal overlap is not less than 2m. In principle, the final static pressure is 1 time to make the surface smooth and clean, and the rolling speed is 1.8-2.2Km/h;

The sixth step is maintenance;

At the end of the rolling process for health preservation, watering is carried out once. After the watering is wet, the health preservation cover is carried out by spreading the bitumen emulsion to permeate the layer. The health preservation period should not be less than 7 days.

In the second step, the support pile adopts butterfly cap screws and fastens the horizontal bar type horizontally and vertically. The ring-shaped groove at the end of the horizontal bar where the line is hung is 3mm deep.

In the third step, according to the change of the cross slope, add processing parts consistent with the change of the cross slope between the basic tamper plate and the punch, and the screed and the screed box, and pave to the gradual straight line of the curve section. At the point, according to the change of the cross slope, the workpieces are reduced until the road surface of the straight line is consistent with the cross slope of the road shoulder, and all the workpieces are taken out.

In the fourth step, when it is necessary to set up transverse joints, the treatment method is to remove the uncompacted mixture near and below the paver, and dig the end that has been compacted and meets the requirements of elevation and flatness into a joint. For the horizontal and vertical downward section, the paver returns to the end of the compacted layer, uses wooden backing boards to padded to the virtual paving height, and then spreads new mixture, and continues to the next step of construction;

There are two schemes for the setting of transverse joints: one is to set transverse joints under abnormal conditions. If the paving is interrupted for more than 2 hours, the uncompacted mixture near and below the paver should be removed, and the compacted and The end where the elevation and flatness meet the requirements is dug into a section perpendicular to the center line of the road and vertically downward, and the section is brushed with cement slurry, and then the new mixture is spread and rolled longitudinally normally; the second is that the construction ends on the same day For the operation section of a certain construction layer, before entering the next section of this layer on the next day, cut vertically within 1m of the horizontal joint of the compacted section, clean it up, pave and roll the cut part according to the loose pavement thickness, and then The rolling joints should overlap at least 2m.

In the fifth step, there are two ways of rolling. One is that the rolling direction of the vibrating roller is consistent with the linearity of the roadbed. The parking spaces of the vibrating roller should be staggered into a ladder shape, and the uplift of the parking spaces should be leveled manually; The other is that the vibratory roller turns left or right before parking back pressure, and the next parking mark will exceed the previous one; Clear the embankment after scraping.

Compared with the prior art, the present invention has the following beneficial effects: the cement-stabilized crushed stone base layer ultra-high reverse slope section of the one-time forming construction method provided by the invention, the road adopts the cement stabilized gravel base layer before the one-time forming construction of the ultra-high reverse slope section, It needs to consume 3 working days, but the present invention can be completed in only 2 days, saving 1 working day per kilometer on average. Based on the calculation of the contracted engineering volume of 112.5 kilometers, the construction period can be saved by more than 100 days. And subsequent work such as permeable course, asphalt concrete wear course, pre-wrapped asphalt stone chip seal course, etc. can be started in advance. If the comprehensive calculation method is used, the construction period can be greatly saved by more than 100 days.

Description of drawings

Figure 1 is a schematic diagram of the structure of the elevation control pile.

Figure 2 is a structural diagram of the adjustment of the screed at the end of the paver.

Figure 3 is a list of particle composition ranges suitable for cement stabilized aggregates.

Figure 4 is a table of direct cost savings per kilometer.

In the picture:

1 Wing cap screw 2 Cross bar 3 Sliding block

4 grooves 5 tamper plates 6 processed parts

7 punches 8 bolts 9 ironing flat bottom plate

10 steel plates

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

The invention is applicable to the construction of the base course of any grade of road with the requirement of reverse slope in the ultra-high section, and is also suitable for the construction of the subbase and surface course with the requirement of reverse slope.

The process principle of the present invention is to adopt the construction method of LTU120 multifunctional paver to pave, and assemble the screed plate consistent with the width of the shoulder of 1.5 meters on the two ends of the paver, according to the change of the transverse slope of the main lane and the transverse slope of the road shoulder, Adjust the screed at the end to meet the requirements of one-time forming construction of the super high reverse slope section of the base.

Construction scheme of the present invention:

1. Construction stakeout.

Accurately determine the pile number of the superelevation section, especially the stakeout of the straight section entering the curve section and the curve section entering the straight section, and make a striking mark on its critical point (straight slow point, slow straight point), which is also the cross slope of the road surface and shoulder Inconsistent starting point or ending point, so that the grassroots construction personnel can adjust the paver timely and accurately, so that the superhigh section grassroots can be carried out according to the design requirements completely and correctly.

2. Arrange the baseline steel wire.

On the edge of the middle pile and the inner edge of the road shoulder, the elevation control pile is placed, and the elevation is controlled by hanging wires on both sides. Support piles are installed on both sides of the road. Tighten with a tensioner every 100-150 meters, and the tension is generally 8-10KN. The height difference of the pile points must meet the accuracy requirements. The supporting piles are best to use butterfly cap screws 1, horizontal and vertical fastening crossbars 2, open-ring grooves at the ends of the crossbars 2 where the wires hang 4, groove depth 3mm, butterfly The bottom of the shaped cap screw 1 is a sliding block 3 . As shown in Figure 1, stakeout elevation = design elevation + loose paving amount ± distance from the control pile to the road shoulder edge (generally 50-80cm) * design transverse slope, the overhang of the control crossbar 2 should keep the piles consistent, and the construction Ensure that the pile position is stable, the line position remains unchanged, and the elevation accuracy meets the specification requirements.

3. Adjustment of the screed at the end of the paver.

The driving lane is 6.5 meters, and the two sides of the road shoulder are 1.5 meters. The superelevation section of the main lane mainly changes between 3% and 4%. Therefore, through the research on the above data, combined with the technical parameters of the LTU120 multifunctional paver we purchased , improving and assembling the paver can meet the requirements of one-time formation of the super-high reverse slope section. The fixed 6.5-meter screed, with a total length of 9.5 meters, meets the technical requirements. According to the minimum cross slope of the main driveway of 3% and the elevation requirements, the 1.5-meter screed plate 9 and the tamper plate 5 are processed into a consistent geometric relationship. , The screed base plate 9 is provided with a steel plate below by bolts, and the top of the screed plate base plate 9 is a punch 7, so that the paved road surface can be paved to ensure consistent compactness. Since the transverse slope of the main lane is a non-constant, the angle α between the road shoulder and the road surface in the reverse slope section is constantly changing. For the change of cross slope, between the basic tamper plate 5 and the punch 7 and the processed end 1.5m screed and the screed box, the processed parts 6 that are consistent with the change of the cross slope can be gradually added to ensure the cross slope of the road surface. Both the slope and the cross slope of the road shoulder meet the design requirements. When paving to the gentle straight point of the gradually changing straight section of the curve section, according to the change of the cross slope, gradually reduce and process parts 6 until the road surface of the straight section is consistent with the cross slope of the road shoulder, take out all and Work piece 6, so far, the end screed is consistent with the main screed, the construction of the super high reverse slope section is completed, and when the next reverse slope section comes, it can be repeated, as shown in Figure 2.

Fourth, paving.

Paving speed:

When selecting the working speed of the paver, it is necessary to comprehensively consider the supply capacity of the mixture, that is, the production capacity of the corresponding mixing equipment, the tonnage, quantity, and transport capacity of the dump truck, the width and thickness of the pavement, and especially the super height. The particularity of the reverse slope section enables the paver to work continuously at different construction speeds in different road sections, so as to ensure the paving of a base road with uniform density and high flatness;

The reasonable paving speed calculation formula is as follows:

V=Q/60BHY

In the formula: V represents the paving speed (m/min); Q represents the supply capacity of the mixture (t/h); B represents the paving width (m); H represents the paving thickness (m); Y represents the bulk density of the mixture (t/m ³ );

Paving speed of super high reverse slope section;

According to climatic conditions, design parameters, properties of mixture and other factors, after a long period of exploration, it is concluded that the paving speed of the super high reverse slope section is the normal paving speed multiplied by the adjustment coefficient K, K=(B-1.5)/B, The recommended paving speed is 1.2～3.4m/min.

Correct use of sensors;

The suspension method is used for construction, and the paving width is 9.5 meters. Therefore, the longitudinal slope sensor on both sides is used to overcome the camber formed by the rigidity error of the base part and the extension part of the screed, and improve the sensing accuracy. The slider detector on the sensor It should be located on the benchmark, preferably 30-50cm in front of the screed, so that a smooth curve without increment can be obtained in the super high section.

Mixture Paving:

Before paving, sprinkle water to moisten the base layer, check the operation of each part of the paver, adjust the width of the screed, and adjust the height according to the thickness of the base layer. Press on the edge of the square wood, preferably 2-5cm away from the edge. Put the screed in a floating state, adjust the oil mark and scale, put all the working devices in a fully automatic state, and then carry out the cloth;

Set up a special person to direct the transport truck to unload the paver. There are at least 4-6 trucks waiting for unloading in front of the paver before paving can be started to ensure continuous paving work. At the same time, a sufficient amount of mixed material should be kept in the hopper of the paver to reduce segregation In case of accidents, it is strictly forbidden to hit the paver when the material truck is reversing, so that the paver will move backward to form a step. It is strictly forbidden to unload too much material, which will change the paving speed and form fluctuations or washboards. Always pay attention to whether there is material leakage in the crawler walking route or other sundries, and remove them in time,

Arrange two people behind the paver to measure the paving thickness and adjust the thickness, and always pay attention to the working status of the sensor and whether it is on the steel wire. 2/3 of the auger of the paver should be buried in the mixture;

After confirming that the paving effect is normal, you should keep in mind the parameters of each part of the paver. When paving the next day, you should use this as the basis for the paving layer. You cannot change the running speed, vibration and vibration speed, etc. of the paver casually. The speed, camber and elevation angle of scraper and spiral. It should ensure uniform speed and uninterrupted continuous paving, and it is strictly forbidden to be fast or slow or large or small. Minimize the number of shutdowns, and there will be shutdowns and waiting for materials when the delivery of the mixture is interrupted

When paving, the straight section should reach the straight line of the paving belt, and the paving belt should be round and smooth when it is curved, and always keep the correct direction. smooth.

When the paver is working on a normal longitudinal slope, it should be paved from a low place to a high place. If it is necessary to work downhill, it must cooperate with the dump truck to ensure a stable speed; when working on a large slope, reduce the amount of mixed material in the hopper. 60% of the rated paving capacity, while controlling the driving speed and turning radius; when paving on a cross slope, the mixed material tends to flow downhill, in order to prevent the mixed material from flowing downhill quickly, Helical blades in the same direction can be used on both the left and right sides.

After the paver, 2-3 people should be arranged to be responsible for clearing the aggregate segregation, coarse aggregate nest or coarse aggregate belt, and fill it with fresh mixture, or add new material and mix evenly before filling and leveling;

In case of quality problems of poor flatness during the paving process, as long as the maximum particle size in the mixture does not exceed 37.5mm square hole sieve, and the paving compaction time does not exceed the initial setting time of cement within 3 hours, Gently scrape it with a grader in time, and discard the scraped waste. After the grader is scraped, be sure to use a road roller to compact the surface.

Key points in the construction of paving mixture: must strictly abide by the paver operation regulations; keep the height of the mixture before the paver screed unchanged; keep the screw distributor in working condition for 80% of the time; reduce the number of shutdowns/startups Absolutely avoid the collision of the material truck with the paver; in the construction plan, the working hours should be extended as far as possible, and the transverse joints should be reduced as much as possible; Flatness; ensure that the paver is always in good working condition during construction.

Horizontal seam treatment:

Due to the large number of structures in this lot, in general, the space between two structures is regarded as a construction section, and transverse joints should be avoided as much as possible. When it is necessary to set up a transverse joint, the treatment method is to remove the uncompacted mixture near and below the paver, and dig the end that has been compacted and meets the requirements for elevation and flatness into a horizontal and vertical downward joint. Cross-section, the paver returns to the end of the compacted layer, uses wooden backing boards to padded to the virtual paving height, and then spreads new mixture, and continues to the next step of construction.

There are two schemes for the setting of transverse joints: one is to set transverse joints under abnormal conditions. If the paving is interrupted for more than 2 hours, the uncompacted mixture near and below the paver should be removed, and the compacted and The end where the elevation and flatness meet the requirements is dug into a section perpendicular to the center line of the road and vertically downward, and the section is brushed with grout, and then the new mixture is paved and the longitudinal rolling is carried out normally. The second is the operation section of a certain construction layer after the construction on the same day. Before entering the next section of this layer on the next day, cut vertically within 1m of the horizontal joint of the compacted section, clean it up, and cut the part according to the thickness of the loose pavement. Paving and rolling, the rolling at the joints should overlap at least 2m.

Five, rolling.

Rolling should follow the paver closely and carry out rolling in time to prevent the moisture of the mixture from volatilizing and ensure that the structural layer is formed under a suitable water content. Generally, a 14T vibratory roller is used to pave the roadway at a distance of 50 meters. The shoulder of the ultra-high reverse slope section is usually followed by the paver. Due to the narrow working surface, a manual vibratory roller is used for rolling.

The straight line section is rolled from both sides to the center, and the curved section is rolled from the inside to the outside. When rolling, the longitudinal overlap is not less than 0.4m, and the horizontal overlap is not less than 2m. In principle, rolling is carried out according to the test data, and finally the static pressure is pressed once to make the surface smooth and clean;

While ensuring the compaction of the edge, it is necessary to prevent the side phase displacement of the mixture. The rolling speed is generally 1.8∽2.2Km/h, and the gear shifting of the roller should be smooth. It is strictly forbidden to pull or push the structural layer by sudden braking;

There are generally two ways of rolling. One is that the rolling direction of the vibrating roller is consistent with the linearity of the roadbed, but the parking spaces of the vibrating roller should be staggered into steps instead of in a straight line, and the raised parking spaces must be manually raised. leveled. The other is that the vibrating roller turns left or right before parking back pressure, and the next parking mark will exceed the previous one.

Before the end of the rolling process, it is necessary to apply a grader for final leveling treatment again. The process should be carried out carefully, and the embankment should be cleared after scraping off the local raised part. So far, for the local potholes on the surface, no more repairs should be carried out, and they should only be dealt with during the construction of the base or penetrating layer oil sub-item.

Note on rolling.

Immediately after the mixture has been spread evenly, it should be statically pressed with a vibratory roller to expose potential unevenness of the paving layer. So far, local convex and concave places have been found, and the surface must be loosened with a 5cm thick surface with a toothed rake, and filled with freshly mixed materials. According to the principle of "rather scratching than repairing", all construction projects should be completed before the final setting time of cement, and the required compaction degree should be achieved, and there are no obvious wheel tracks; On the road section that has been rolled; to ensure the compactness of the edge of the cement-stabilized gravel base, there should be a certain super-width; After the new layer is rolled, it will be rolled normally in the longitudinal direction; after the roller is rolled, it will drive along the slope of the end to the lower bearing layer and stop overnight.

Sixth, maintenance.

After the rolling process is over and the compactness test is qualified, the health preservation process of watering should be carried out immediately. After sprinkling water and wetting, in order to prevent the water in the cement-stabilized soil from evaporating, immediately make a permeable layer on the completed base layer, and spread the asphalt emulsion permeable layer to ensure that the cement can fully play its role; according to the technical specifications, the curing period should not be less than The health preservation period is 7 days; during the health preservation period, road fences are used to close the traffic, and special personnel are set up to guard it. It is absolutely forbidden to drive heavy vehicles. If there is a sprinkler passing by, the speed of the vehicle must be limited within 15km/h; in order to achieve civilized construction, water should be saved resource.

The material of the scheme of the present invention.

The raw materials used in the base construction shall be tested and tested according to the relevant specifications and the engineer's instructions. Ensure that the quality of incoming raw materials meets the specifications and design requirements, and stack them in separate warehouses. Strictly carry out material storage in accordance with the material demand plan and material procurement plan of this project to ensure that the quality, supply, transportation, loading and unloading, and storage of construction materials all meet the normal construction needs.

Cement, as a stabilizer of aggregates, its quality is crucial to the quality of aggregates, and cement with a longer final setting time and lower grades should be selected during construction. In order to allow enough time for the stabilized soil to be mixed, transported, paved, rolled and guaranteed to have sufficient strength, fast-setting cement, early-strength cement and damp-deteriorated cement should not be used. According to the contract requirements, this project uses No. 425 ordinary Portland cement.

Aggregate, coarse and fine aggregate is the skeleton of the cement-stabilized base, and is the main supporting material for stress. Aggregate with rough surface, hard stone, strong wear resistance, good embedding effect, and good cementing ability with cement should be selected. The coarse and fine aggregates of the cement stabilized base of this project are made of volcanic ash rock machine-made crushed stones. The specifications of the crushed stones are determined by the thickness of the cement stabilized base and the specification requirements. The maximum particle size of the aggregate is not more than 50mm, and the particle composition is listed in Figure 3 within the distribution range. Cement stabilized base is composed of crushed stone, stone chips and mineral powder, and the amount of each specification material in the theoretical grading is determined. In actual work, since the gradation of individual crushed stones and stone chips is not very stable and balanced, when preparing materials on the construction site, random inspection and screening are required at any time, and small adjustments are constantly made. In this way, productivity can be increased and the quality of the final cement-stabilized base mix can be stabilized.

Water, usually suitable for drinking, can be mixed and maintained for water stability. When in doubt about the water quality, tests are required to determine whether there are substances in the water that have a significant impact on the development of cement strength. If the ratio of the compressive strength of the cement mortar made from water source to the compressive strength of the cement mortar made from distilled water is lower than 90%, such water shall not be used for water-stabilized construction.

Additional notes:

In view of the above quality inspection and quality standards, in the actual grassroots construction, after analysis and discussion, the following points are summarized, which can basically ensure that the quality of grassroots construction meets the above standards and the requirements of engineers; design a reasonable mix ratio of cement stabilized gravel, strengthen mixing, The mixing should be uniform, and no separation of coarse and fine aggregates should occur. Each aggregate pile should be bulldozed with a loader or bulldozer at any time to avoid the formation of a cone and cause the coarse aggregate to slide to the bottom of the cone; , use as low cement content as possible; the production water content of water-stabilized crushed stone should be adjusted according to different temperature, climatic conditions and the range of rolling water content required by different filling positions. Usually, when the weather is sunny and windy, The water content in production should be increased by 1.5% compared with the water content in rolling, and it should be increased by 1% in cloudy days to compensate for water loss; the transportation of the mixture should avoid the bumping of the vehicle to reduce the segregation of the mixture. When the temperature is high and the transportation distance is long, it should be covered with felt cloth to prevent excessive water loss; before using the paver and leveling device, it should be carefully set and adjusted to make it in good working condition, and according to the actual paving Adjust the effect at any time; set up special personnel on site to direct the transport vehicles to ensure the uniform and continuous operation of the paver. The paver must not stop on the way, and the speed of the paver must not be adjusted at will; Strengthen the health preservation of water-stabilized gravel to avoid excessive water volatilization; strictly control the water content of rolling, according to the properties of water-stabilizing materials, control timely rolling at the optimum water content of 0-1%, and try to avoid excessive water content. The phenomenon of "elastic softness" and "wave" will greatly affect the density and strength of the mixture, increase the shrinkage of the mixture, and make the structural layer prone to shrinkage cracks; or the mixture is easy to Loose, not easy to roll and form, will also affect the possible density and strength of the mixture; according to the performance characteristics of the water-stabilized mixture, determine the model and weight of the road roller, determine the rolling speed, and choose a reasonable vibration frequency and amplitude. It is strictly forbidden to brake suddenly or start quickly on the unformed surface; after the rolling is completed, carry out self-inspection and evaluation according to the relevant quality standards, and deal with it in time before the final setting of the cement to ensure that the external dimensions and internal quality meet the specification requirements; immediately enter the health care after rolling During this stage, the surface of the base is always covered, and the curing period is not less than 7 days; seams should be minimized, and the treatment of horizontal seams should be carefully done.

Benefit Analysis:

It takes 3 man-days per kilometer before one-time molding construction of super-high reverse slope sections with cement-stabilized gravel bases for highways, but the present invention can be completed in only 2 days, saving 1 man-day per kilometer on average. Based on the calculation of the contracted engineering volume of 112.5 kilometers, the construction period can be saved by more than 100 days. And subsequent work such as permeable course, asphalt concrete wear course, pre-wrapped asphalt stone chip seal course, etc. can be started in advance. If the comprehensive calculation method is used, the construction period can be greatly saved by more than 100 days. In addition, adopting the present invention can reduce one longitudinal seam treatment, saving manpower and mechanical re-construction of road shoulders, because the cement-stabilized crushed stone base layer super-high reverse slope section is adopted for one-time forming construction invention, so there is no need for road surface and super-high reverse-broken road shoulder Separate construction. According to the implementation specification of this project, since the base material is stable with cement, it is required to apply a layer of cement slurry before joint treatment, and according to the local labor and material market, it can be calculated that 13 laborers are required for each kilometer of road shoulder and longitudinal joint treatment1 One working day, one shift of sprinklers, one shift of road rollers, one shift of 3 dump trucks, one shift of mixing station, 3800 liters of cement slurry, etc. After calculation, the direct cost saved per kilometer is shown in Figure 4 shown.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be defined by the claims.

Claims (5)

1. a cement stabilized macadam base superelevation counter-slope section one-shot forming construction method, is characterized in that:

The first step, construction lofting;

Determine freeboard section pile No., enter the setting-out of straightway for straightway arrival curve section and curved section, mark is made to its critical point;

Second step, arranges reference line steel wire;

At the edge of king-pile and curb inner edge, put and survey high process control stake, adopt both sides hanging wire to control elevation, along beating supporting pile on both sides of the road, straightway pilespacing 10 meters, horizontal curve certain distance 5 meters, hang ￠ 3.0mm steel wire, strain with turnbuckle every 100 ~ 150 meters, pulling force is 8 ~ 10KN;

3rd step, paver termination screed regulates;

Runway 6.5 meters, each 1.5 meters of curb both sides, horizontal the breaking of A-road freeboard section is changed between 3% ~ 4%, according to highway technology parameter, the adjustable screed of 1.5 meters of processing is assembled in paver two ends, centre immobilizes the screed of 6.5 meters, and overall length 9.5 meters, is processed into high range request the geometrical relationship conformed to it according to the transverse slope 3% that A-road is minimum by the base plate of 1.5 meters of screeds and hammer ram;

4th step, paves;

Adopt bilateral longitudinal gradient sensor, improve sensing accuracy, the slide bar probe on sensor is positioned on benchmark, is placed in 30 ~ 50cm before screed; Before paving, subbase is sprinkled water moistening, check paver each several part service behavior, adjust the width of screed, and according to groundwork thickness adjustment height, the pad lumps of wood, then be placed in and treat that bunk is put, the hammer that makes to vibrate is pressed in lumps of wood edge, isolated edge 2 ~ 5cm, screed is in quick condition, adjust oil ga(u)ge and scale, then carry out cloth, when horizontal wall inscription road paves, use the helical blade of equidirectional in the left and right sides;

5th step, rolls;

Roll immediately following paver, the runway 50 meters of distances that pave start to roll with 14T vibratory roller, and superelevation counter-slope section curb, immediately following paver, uses manual vibratory roller to roll;

Straightway is rolled by two side direction centers, and curved section is rolled by Inside To Outside, and when rolling, longitudinal overlap is not less than 0.4m, transverse lap is not less than 2m, and with first static pressure after vibration, first after little tonnage, large-tonnage is principle, last static pressure 1 time is to make surfacing bright and clean, and rolling speed is 1.8 ~ 2.2Km ∕ h;

6th step, maintenance;

Health terminates in roller compaction processes, carries out watering one time, and after watering is moistening, carry out health lid in the mode of spreading asphalt emulsion permeable layers, it is 7 days that preserving period should be not less than preserving period.

2. cement stabilized macadam base superelevation counter-slope section one-shot forming construction method as claimed in claim 1, is characterized in that:

In second step, supporting pile adopts butterfly cap screw, anyhow fastening cross bar type, crossbar end hanging wire place open ring type groove, groove depth 3mm.

3. cement stabilized macadam base superelevation counter-slope section one-shot forming construction method as claimed in claim 2, is characterized in that:

In 3rd step, change according to horizontal wall inscription, at basic hammer ram plate and drift with increase the workpiece consistent with horizontal wall inscription variable quantity between screed and screed casing, during the point of spiral to tangent paving to curved section gradual change straightway, according to horizontal wall inscription change at minimizing workpiece, until when straightway road surface is consistent with curb horizontal wall inscription, take out whole workpiece.

4. cement stabilized macadam base superelevation counter-slope section one-shot forming construction method as claimed in claim 3, is characterized in that:

In 4th step, when transverse joint need be arranged, its processing method roots out near paver and below without the compound of compacting, by grinding compacting and elevation and the satisfactory end of planeness scrape out a horizontal section vertically downward, paver turns back to the end of compacted lift, with sheeting caps pad to empty paving height, the newer compound that paves, continue next step construction;

Transverse joint arranges employing two schemes: one is arrange transverse joint under abnormal condition, if the interruption that paves is more than 2h, then near paver and below uncompacted compound should be rooted out, by grinding compacting and elevation and the satisfactory end of planeness scrape out section vertical with Lu Zhizheng line and vertically downward, and on section swabbing mud, and then the new compound that paves normally carries out longitudinal rolling; It two is that construction on the same day terminates the job step of a certain construction layer, before within second day, entering next section of construction of this layer again, by the transverse joint position 1m scope perpendicular cuts in compacting location, remove clean, loose laying depth decking and rolling is pressed in cut place, and seam crossing rolls and at least should overlap 2m.

5. cement stabilized macadam base superelevation counter-slope section one-shot forming construction method as claimed in claim 4, is characterized in that:

In 5th step, the walking manner rolled has two kinds, a kind of be vibrating roller roll the linear consistent of direction and roadbed, the parking space of vibrating roller will be staggered into stepped, and with manually being evened out by the protuberance on parking space; Another kind is that vibrating roller turns direction in parking back pressure forward direction left or right, and parking vestige next time exceedes the last time; Before roller compaction process terminates, impose land leveller and put down process once eventually again, local the raised area is struck off outside rear removing embankment.