Ground hockey stick construction method
There are many types of grass-roots hockey bats. This article mainly describes key construction techniques of various grass-roots level.
1. There are two main aspects of soil-base construction. First, the scope of construction rolling should meet the requirements for design dimensions, and there should be some room on each side, generally 0.2-0.3m wide. The overall performance of the site is good and uniform. The second is the compaction density of the soil base layer, which is to reach 90% of the optimal density when rolling all over the site. This is to prevent uneven sinking of the site.
2. Lime and fly ash gravel layer, in the construction, the material mix ratio is accurate, the unconfined compressive strength must meet the specification requirements (R7=0.6~0.8MPa), the design thickness is guaranteed during construction, and the optimum moisture content Rolling operations are carried out, and the height and flatness are controlled with a 5mx5m square grid. When rolling, it is necessary to check whether or not there is a phenomenon of slushing and to find a place to thoroughly handle one place.
3. Graded sand and gravel layer: to ensure the thickness and compaction density during construction, the control operation method is to measure with 5mx5m square grid, and check the flatness and thickness at any time. The best method of compaction is to spray sufficient amount of water before rolling, prevent dry grinding, and to complete repairs at one time, rolling to the optimal compactness requirements.
4. Asphalt concrete layer: To use hot asphalt concrete for the plant, the asphalt concrete pavers with automatic leveling shall be used on the construction site as much as possible, and the width of each work shall not be less than 8m. The paving sequence should be started in the long direction of the site. Roll compaction should be preceded by a light drum roller, followed by a heavy roller, and finally by a light roller. The appearance inspection is done with no rollers rolling the track.
5. Cement concrete layer: First of all, the cement concrete mix design must be completed to meet the design document requirements. Cement concrete for construction uses mechanical mixing and the materials used are measured according to the mix ratio. Cement concrete shall be placed in a firm formwork and compacted with an electric vibrator. The concrete shall be cured immediately after pouring, and shall not be exposed to the air to prevent cracks from occurring. The cement concrete after pouring shall comply with the requirements of the code. Make enough compressive test blocks and flexural test blocks, and perform standard maintenance for 28 days.
The cement concrete blocks must be partitioned according to the design proposal. The design of the blocks without the design can be divided into blocks according to the vertical direction of the hockey arena. Each block is mainly rectangular, and the general size is 3.0~3.5mx5. .0 ~ 5.5m, not to be divided into positive length, you can not set up the real seam (expansion joints) the best way to use the slitting machine slits, the relationship between the slits is that the transverse slits to communicate with the longitudinal slit phase vertical.
6. Planting soil and crushed gravel layer: During construction, layers should be leveled and pressed with bulldozers or track-type machines. When there is a drainage blind ditch under the crushed gravel, after the gravel layer is completed, excavate the tank. Accurate position, blind channel filling and other constructions are easier to master.
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