JPH02157304A - Construction for pavement of bed in play-ground - Google Patents

Abstract

PURPOSE:To shorten a construction period and to reduce construction cost without requiring a removal of surplus soil forming a crushed stone and crushed stone dust layer and an asphalt concrete layer on the upper layer of a soil cement layer having soil generated in the field as a skeleton material. CONSTITUTION:A soil setting agent is added to a levelled ground 1, drilled and agitated, then, a rule 6 laid at a constant interval to the finished surface is used to level a mixed soil by a level rod 7, press by a roller and form a road bed 2. Then, crushed stone, crushed stone dust and soil produced in the field are mixed, a soil setting agent is added and kneaded and the obtained product is laid, leveled to the rule face, pressed by the roller to form a bed 3. Before the road bed 2 and the bed are cured, lumps of crushed stone 4 are dispersed, pressed by the roller, a part thereof is bitten to unify the road bed 2 and the bed 3. Further, the thin layer made of asphalt concrete is formed on the finished face of the bed 3.

Description

[Detailed Description of the Invention] I, 511! OBJECT OF THE INVENTION [Field of Industrial Application] The present invention is to provide, at low cost and in a short period of time, a firm roadbed for all-weather pavement for courts such as tennis courts, various sports fields, school playgrounds, and the like.

[Conventional technology] Courts such as tennis courts, and various sports fields.

In the past, FJ installations for sports facilities such as school playgrounds and other sports facilities were usually made of clay pavement. The reason for this is firstly that the construction costs are low, and it also has many advantages such as superior cushioning. However, on the other hand, usage efficiency is low due to the effects of rain and frost (and dust pollution is generated, so maintenance costs are high due to the need for maintenance throughout the year.For this reason, in recent years, maintenance costs have increased. There is a trend toward all-weather types with high usage efficiency, and there is an increasing demand for retrofitting not only lFr installations but also existing clay 141-type and Ya-1.

However, the construction cost of all-weather pavement is high, and this is a major impediment to its widespread use.Currently constructed all-weather pavement consists of asphalt/concrete pavement with a synthetic resin coating, or felt, plastic lattice, 1 artificial turf ( (with sand)
There are various types such as those covered with such things. The roadbed and roadbed are all the same. In other words, the native ground is leveled and crushed stone is placed on top of it to a thickness of 100 to 150 mm.
- to create a roadbed, and on top of this, asphalt
The roadbed is formed by pouring concrete to a thickness of about 50-70I11@. Furthermore, in cold regions, in order to prevent frost heaving failure of the roadbed, soil is excavated and drained to a depth of approximately 80% of the freezing depth (for example, 80C deep in places where it freezes to 1m underground), and replaced with crushed stone. A drainage layer must be provided.

[Problem to be solved by the invention 1] In order to create all-weather pavement as described above, multiple layers of expensive civil engineering materials are used, and in addition to transportation and work costs, the construction cost increases significantly and the construction period is also increased. Furthermore, when converting existing clay pavement to all-weather pavement,
It is necessary to match the finished surface to the height of the existing surrounding gutter surface and fence foundation, so the total thickness of crushed stone and asphalt concrete, i.e. 150 to 200 m.
Over 100,000 m of topsoil must be excavated and discarded, and in urban areas, an even larger amount of money is required to dispose of the remaining soil.Originally, this side road follows the specifications of road pavements for heavy vehicles. The maximum uniaxial compressive strength due to the movement of a single human body is 10 kg/c-, which has an unnecessary strength. Therefore, the strength of the nameplate and roadbed is 30 times the safety level.
kg/c- is sufficient.

The object of the present invention is to streamline these points and create a roadbed that is necessary and has sufficient strength at the lowest cost and in the shortest period of time.

Summary: Structure of the Invention [Means for Solving the Problem] The present invention creates a soil-cement stabilized roadbed using on-site soil as aggregate, and a roadbed layer on which a mixture of crushed stone and crushed stone dust is treated with cement. By fixing the nine layers, a paved roadbed is formed that is integrated with the roadbed.Also, if the surface is to be painted with synthetic resin, a thin asphalt/concrete layer is placed on the upper layer of the roadbed and fixed to the lower layer.

Next, as a construction method, rulers are laid down at regular intervals according to the final finished surface, and based on these, the leveling process of each layer is precisely carried out.Also, after the crushed stone/dust subgrade layer is placed and before it hardens. A construction method in which crushed stone with a diameter larger than its thickness is spread and compacted to adhere to the lower subgrade layer and the upper asphalt/concrete layer.

[Function] Since the construction of the present invention utilizes the entire site, no residual soil is generated, and the amount of materials brought in from outside is extremely small.Furthermore, the soil/cement subgrade of the present invention has a strong heat insulating effect. Even in cold regions, it is sufficient to slightly increase the thickness and no drainage layer is required.

Next, all weather-type M-equipped rainwater tJj trees rely on the surface slope, but the permissible slope is extremely small, so even slight unevenness can cause water to pool. For this reason, in conventional construction methods, a large number of experienced craftsmen are employed in the leveling process of the writing layer, whereas the construction method of the present invention follows a ruler, so it does not require a high degree of skill or a large number of workers.

When stacking thin layers of different or homogeneous materials, delamination is likely to occur due to differences in shrinkage rates due to the degree of water content between the upper and lower layers.
In the present invention, by using crushed stone as a wedge to bite into and fix both layers, it was possible to fix the layers in order to disperse the vertical shrinkage.

Furthermore, when covering the surface with asphalt concrete, the crushed stone becomes the "root" and the asphalt concrete layer is fixed with the puffer coat, so material costs and labor costs are significantly reduced due to the simplified structure and construction method. Along with this, the construction period was also shortened.

[Example J] An example of the roadbed pavement construction method of the present invention will be described below based on one drawing.

Figure 1 is a cross-sectional view of the basic structure of the finished roadbed pavement using this construction method, with an asphalt/concrete layer on top of it, Figure 2 is a plan view of ruler laying, and Figures 3 and 4 are cross-sectional views of the same. be.

■The site ground (1) is leveled using a ground leveling machine such as a bulldozer according to a predetermined slope to within ±20 m, and the ground is created by rolling the ground with rollers. (If the slope is accurate, such as an existing clay tennis court, omit this step.) ■ Spread soil coagulant evenly on the leveled ground or clay court at a rate of 12 to 15 kg per ld. Then, use a tiller such as a tractor to excavate and stir the soil to a thickness of about 100 m.

In cold regions, the plowing depth should be 200 to 250 cm, and therefore the soil coagulant should be reduced to 25 to 4 p.m. per lrr/lrr.
Use about 0 kg.

■ Place the ruler shown in Figure 2 (6) on top of the mixed and agitated ground according to the predetermined surface height, slope and direction.
Lay accurately at m intervals. For example, the ruler is 120sv+X
Use a square lumber of 150-Akebono x 4m with no irregularities. The ruler must be firmly fixed so that it does not move vertically or horizontally ■ Fix the leveling rod (square lumber) (7) to the end of the arm of the tractor or backhoe, and while roughly rubbing it from side to side, attach it to the rulers on both sides. The mixed soil is leveled by rolling and then compacted with rollers to create the roadbed (2). The roadbed surface sinks approximately 15 mm or more from the ruler surface due to compaction.

■Particle size adjustment Crushed stone, crushed stone dust, and soil generated on site are mixed at a certain ratio, and cement for soil coagulation is added to this mixture, then the mixture is spread on the subsidence of the subgrade surface, and similarly aligned with the ruler surface using a leveling rod. After leveling, it is rolled to form the roadbed (3).

■Before the roadbed and roadbed harden, apply grain size 30~ to the roadbed surface.
Crushed stone blocks (4) of about 40m are liter per 100m”
A roadbed with an integrated roadbed is formed by evenly distributing it at a ratio of about 1000 ml and rolling it with a roller so that a portion of it bites into the lower grade bed layer (2).

For construction from the second row, remove the ruler on the already finished side and use the surface of the finished subgrade (3) as the ruler on one side. Also, fill the grooves created by removing the ruler with a mixture of crushed stone dust, site soil, and soil coagulant, and thoroughly compact the area.

Although the embodiments of the basic structure of the present invention have been described above, an embodiment in which an asphalt concrete layer is provided on the upper layer will be described next.

In this case, do not remove the ruler used for the work up to (■) in the previous section and use it as is.

■ Spread about 1 liter of asphalt emulsion for tag coating on the finished roadbed surface. At this time, the ruler is cured by applying lime water droplets to the ruler so that the asphalt emulsion does not run directly along the ruler, and the asphalt emulsion used is a neutral one that does not react with the alkali of cement.

■ Spread heated fine-grained asphalt mixture on top of the tag coat to a thickness of about 15 to 20+ m ■ 1. Follow the ruler on both sides to level it with a leveling rod, then finish by rolling it with a roller. . At this time, the thickness of the asphalt mixture is adjusted by attaching a plate measure (8) with the required thickness to the upper end of the ruler.

For construction from the second row, remove the ruler from the already completed asphalt pavement side and use that side as a ruler. However, attach the extra plate measure to the edge of the 0th side near the 2nd row.

Also, deal with the grooves created by removing the ruler using the same method as in the previous section (■).

C. Effects of the invention A roadbed with sufficient strength and durability necessary for use in playgrounds can be provided at a low cost and in a short period of time. The reason is as follows.

(11) Since all the on-site soil is used as material for the subgrade, expensive materials such as asphalt mix and crushed stone are saved.In the case of cold region specifications, there is no need for drainage layer material, so the difference is even greater. becomes.

(2) When modifying an existing clay pavement into an all-weather type, there is no need to plow the soil for leveling and dispose of the remaining soil, which saves a lot of money and prevents loss of construction time.

(3) By using the ruler leveling method, the leveling process, which conventionally required the most skill and number of people, can now be completed in an extremely short time by a small number of people doing miscellaneous work.

To express the above in concrete numbers, 9.9.1.1.9 What is the price of a conventional asphalt/concrete roadbed with specifications for warm regions? Approximately 4,000 yen per unit, and the construction period is sunny weather 1 in the case of (2) above.
However, the asphalt/concrete covered roadbed of the present invention can be provided at a price of about 2,000 yen and in about 3 days. Furthermore, in urban areas, it may cost about 1,500 yen per 1 d to dispose of surplus soil, and in cold regions, it can cost about 1,500 to 3,000 yen per trn' due to the drainage layer, making the disparity extremely large.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a basic roadbed pavement of the standard specifications of the present invention and a roadbed with an asphalt/concrete layer provided thereon. Figure 2 is a plan view of the ruler installation. No. 31g is a sectional view of ruler installation. Figure 4 is a cross-sectional view of the roadbed on which the asphalt/concrete layer will be installed.

Claims (1)

[Scope of Claims] (1) A roadbed for playground pavement in which a thin layer of crushed stone and crushed stone dust treated with cement is provided on the upper layer of a soil-cement roadbed made of on-site soil as aggregate, and the two are integrated; , an integrated roadbed formed by adhering a thin asphalt concrete layer on top of the integrated roadbed (2) When constructing each of the layers mentioned in the previous section, namely the soil/cement subgrade, crushed stone and crushed stone dust layer, and asphalt/concrete layer, use a ruler. A method of laying and leveling the material. (3) When placing the crushed stone and crushed stone dust layer, crushed stone with a diameter larger than the thickness is mixed in and compacted to make it adhere to the lower roadbed and the upper asphalt/concrete layer.