Method to compact hot asphalt-concrete mixture by rolling with road roller. RU patent 2509839.

FIELD: construction.

SUBSTANCE: in the method of compaction of a hot asphalt-concrete mix by rolling with a road roller, which comprises four working elements that are combined in pairs as two balance trucks, mounted onto rotary platforms relative to the frame of the roller, compaction is carried out as a row of cycles. Each cycle in its first half consists in the fact that trucks are arranged at the edges of the compacted strip, and at the first stage they roll these edges, and subsequent stages are carried out by displacement of trucks towards each other with closure of the previously compacted division. The first half of the cycle is completed by rolling of the central part of the strip with tandem arrangement of balance trucks. The second half of the compaction cycle consists in reverse movement of trucks towards the edges of the strip. Full compaction of the strip is carried out in 2-3 cycles with preservation of the overlapping condition.

EFFECT: compaction of a strip is carried out simultaneously at its both edges by a single road roller, which increases efficiency of works.

2 cl, 3 dwg

The invention relates to the field of road construction, in particular to the technology of sealing surface of the road from the hot asphalt mixes and other similar bitumomineraljnykh materials.

In the world practice the seal of the pavement layers, arranged from the hot asphalt mixes, is self-propelled road rollers of different type and weight. These include rollers with smooth metal rollers both static and vibratory action, as well as rollers on the pneumatic tyres and combined. Last combine pneumatic and smooth metal rollers. Global industry produces a wide range named rinks, distinguished by weight and construction. This fact caused by the existing technology seal structural layers of the road service and a wide range of change of strength properties of sealing material. So, in the beginning of the process of the seals after the laying of asphalt mixes by paver its temperature is about 140 degrees C. a Layer of a mixture is a heavy viscous liquid, not always able to withstand the pressure from the effects of sealing machines and road rollers. This load is transmitted through contact surface rollers with a layer sealing material. The basic rule seal requires that during the whole process of seals was carried out condition SK=(0,8-0,9)σ, where SK - contact pressure under the stars, σ - the tensile strength of a condensed material [1]. However, the growing strength of the sealed material in the process seal comes from two factors - the seal material and cooling layer of the mixture. Finish process seal at temperatures 70-75°N

The cooling layer of the mixture, laid in the floor, occurs at an average speed of 1 C per minute. Therefore, the time to process seal lined cover bands out of hot asphalt-concrete mixture, is about 60 minutes The cooling rate of mixture can change in wide limits depending on the type and brand mix, layer thickness, weather conditions, etc. Proportionally to the change of these factors change and the strength of the layer of the mixture.

From theory seal of road-building materials rolling known that the value of the contact pressure under the roller rink proportional to the relation of linear pressure roll to its radius q/R, where q=Q/B - against gravity, falling on the roller Q, the width of a roll Century This ratio is a measure of the force action of the rink on sealing material. Each temperature interval corresponds to your strength, and thus the contact pressure or the ratio q/R So each type of the ice rink is its most favorable temperature interval. So, light rollers are used for the preliminary podatki asphalt-concrete coating, medium - to intermediate seals, and heavy rollers are used for the final seal coatings. Together, these rollers are working link. Such a practice of the process of summarization of hot asphalt mixes adopted throughout the world.

Packing method of hot road concrete mix rolling through the roller selected as a prototype of the proposed method consists in the fact that each of the above should rinks to make 4-6 passages to the same track sealed surface in the direction and sequence. In sum link rinks should make 20-25 passes on the trail to obtain the required density layer [2]. Further, according to SNiP 3.06.03-85 procedure seal paving of road concrete mix must be done according to the following scheme. So, seal start with the edges of the strip with overlapping each of the previous track (roller pass) 15-20 cm, moving up to the axis laid strip. Then rink goes to the other end of the strip and produces rolling to the axis laid bands with the same overlay tracks. This strict sequence seals due to the fact that the edge of the strip cool down faster than its middle part. To obtain equal density over the entire width of the sealing strip, this condition is mandatory.

A significant drawback of the described technology seal of hot road concrete mix is the need to have on the strip seal, at least link rinks, different in type and parameters q/R. depending on the conditions of production, the quantity of rollers in the link can reach four. Also unknown is the time of replacement easier rink on heavier. This operation depends completely on the practical experience of machinists link rinks and greatly influence the performance and quality of works on sealing. In General, the technology works to seal the road surface is very dependent on human factor, which determines its low productivity.

The sequence of the process rolling according to SNiP 3.06.03-85 increases the seals, and reduces productivity, increase which is possible only in case of application of the second light rink in addition to the first to implement rolling simultaneously with two edges of the strip to the centre of the latter.

These weaknesses are mitigated by the application of the roller described in SU # 1401097 containing four working body pairs are combined in two balance shafts trucks, mounted on a swivel, with respect to the frame of the rink platforms. A skating rink is a universal sealing vehicle to change in the required range of pressure on the counterface. In addition, this rink for the first time in road construction practice the possibility of automation of the process of summarization of hot road concrete mix without the influence of human factor, and through the use of a package of applied programs implemented through on-Board computer. These advantages lead to decrease of the nomenclature used for the sealing works rinks, and also to improve the quality of the actual seal.

However, the technological capabilities of such a machine is not used fully, in particular, in solving improve performance of works under the seal of hot asphalt-concrete mixture, related to the implementation of SNiP 3.06.03-85.

Thus, the objective of the invention is to increase the productivity of work.

The problem is solved due to the fact that in the way that the seal of hot road concrete mix rolling through the roller, which contains four working body pairs are combined in two balance shafts truck mounted on rotating with respect to the frame of the rink platforms, compaction is carried out in the form of a series of cycles. Each cycle in its first half is that trucks have on the edges sealing strip and the first pass happen even earlier these territories, and subsequent passes performed by moving trucks towards each other with overlapping previously compacted hook. Complete the first half of the cycle rolling the Central part of the band at tandem arrangement Centerpoint trucks. The second half of the cycle seal is backward movement of trucks to the edges of the band. Full sealing strip exercise 2-3 loop when the condition of the floor.

Technical essence of the method is that the sealing strips are simultaneously both edges that improves the productivity of work.

Attached to the description, the drawings are:

- figure 1 - schematic representation of the roller, designed to implement the proposed method;

- figure 2 - schematic representation of the roller (top view) location Centerpoint trucks on the edges sealing strips;

- figure 3 - technological scheme of sealing strip of pavement, made of hot asphalt-concrete mixture.

Implemented the proposed method by the roller, which contains four working body, two of which are smooth metal working rolls 1, and the other two - pnevmokokkami rolls 2 (Pneumatics). Pairs of rollers 1 and 2 combined into two balance shafts truck 3, which are the pillars of the rink and by horizontal hinges associated with the platform 4. The latter, in turn, by using the vertical hinge connected to the frame 5 of the rink, carrier cabin 6 and engine 7 (figure 1). Both hinge form a node of type "hinge gook"that allows you to post one of rollers 1 or 2 each balance truck, leaving reference another platform 4 is a possibility of full-circle rotation with respect to the frame 5. Actuators units and mechanisms of the rink not shown.

Figure 3 presents the technological scheme of sealing strip of pavement, made of hot road concrete mix, where the indexes Z1, Z2, z, S4, etc. marked hook portion (half) sealing band, having a length of "In". Arrows "a" denotes the direction Centerpoint trucks 4 of initial position (figure 2) to the centre, and the arrows "B" - from the Central part of the strip to the outside. Index PS, PS etc. published by a number of arrow,marked the direction Centerpoint trucks in the first half of the cycle of compression on the appropriate sections, and indexes US, US etc. - direction Centerpoint trucks in the second half of the cycle. The flowsheet (Fig 3) the whole process seal is conventionally smooth metal rollers 1, although in real terms can be used simultaneously and separately both waltz 1 and 2 each balance truck.

Implemented the proposed method is as follows.

The paver previously laid out the strip of hot asphalt-concrete mixture. Centerpoint truck roller feature on the edges of this band (figure 2) with some overlap in the direction newpathname of the base of the road. While the same rollers set diagonally that Pets technical capabilities used by the roller. Then zahvatke Z1 on the length of the "In" carry out compaction of asphalt mix passage PS rolls 1 and 2 in static mode, giving the minimum contact pressure, the appropriate temperature lined mixture providing a preliminary rolling. At the end of the hook-Z1 shift the balance of trucks in the direction of the arrow "And" by cutting off the hook-Z1 and overlook the casting section, complete Z2, which condense passage PS. In this way condense casting section, complete s passage PS and, finally, tandem arrangement Centerpoint trucks on zahvatke S4 in the Central part of the band, a passage PS complete the first half of the cycle seals. The second half of the cycle starts passage US also tandem arrangement Centerpoint trucks. Then last consistently translated in the direction of "B" on zahvatki s, Z2, Z1, where passages US, US and US completes the second half of the cycle seals. Thus for each of the sections within one cycle is two passes, for example, on the first zahvatke Z1 - passes PS and US. If the sealing strip will be fully implemented in two rounds, each zahvatka will close for four passes to the same track that meets the minimum requirement SNiP 3.06.03-85.

Road roller, containing four rollers (two smooth metal and two Pneumatics), United in Centerpoint truck (figure 1), allows each pass through the same zahvatke to perform with different load on sealing material, i.e. with various contact stresses depending on the temperature of road concrete mix and other related external factors. For example, the first pass can be done using the seal hook combination of smooth drum and Pneumatics, which corresponds to the conventional static combined rink light-weight category. The second pass is carried out using only tires, which involves hanging the smooth rollers and redistribution more load on Pneumatics. The third path is carried out only on smooth rollers in static mode with simultaneous hanging out of the tires that redistribution more load on the smooth rollers and smaller contact with the sealing last floor will give a higher load as compared with the second passage. The fourth pass is like the third, but is accompanied by the inclusion of vibration mechanisms built into smooth rollers. Thus, one road roller, you can implement the whole process seal strips of hot asphalt-concrete mixture, tracking the natural decline in temperature of the mixture rising power influence on it by selecting the optimal combination of working bodies chetyrehvalkovoj the roller and the application of the proposed method of sealing.

The literature used in the preparation of the description

1. Road machines. Naharnet, L.: Engineering, 1976.

2. Construction and repair of asphalt-concrete coatings. Mesmeric-Bagdasarov and other "Asphaltenes", Belgorod, 2007.

1. Packing method of hot asphalt-concrete mixture by road roller, containing four working body pairs are combined in two balance shafts truck mounted on rotating with respect to the frame of the rink platforms, characterized in that the seal is carried out in the form of a series of cycles, each of which in the first half is that trucks have on the edges sealing strip and the first pass happen even earlier this region, and the subsequent the passages carried out by moving trucks towards each other with overlapping previously compacted zahvatki and complete the first half of the cycle rolling the Central part of the band tandem arrangement of the cart, and the second half of the cycle seal is backward movement of trucks to the edges bands with observance of conditions of overlap.

2. The method according to claim 1, characterized in that the full seal strips exercise for 2-3 cycles.