Taiyuan, Shanxi Tender Document for Land Consolidation of a Township in Jiancaoping District
The green vegetable planting area of the land development and consolidation project in Baiban Township, Jiancaoping District, Taiyuan City mainly produces pollution-free vegetables. Micro sprinkler irrigation water-saving irrigation technology is adopted in this area, and rotation irrigation is adopted. This area is concentrated in the southwest of Zhencheng Village and the southeast of Baiban Village, involving plots (6), (8), (9), (10), (11), (12), (13), (17), (17-1), (19), (20), (21), (22), (23), (23-1), (24), (24-1), etc. The irrigation area is 40.51 hectares. It is divided into two parts, the east part and the west part. The shape is irregular polygon. The area of the west part is 23.1 hectares, accounting for 75% of the total area of the irrigation area. The area of the east part is 17.41 hectares, accounting for 43% of the total area of the irrigation area. The east and west areas are supplied by two reservoirs, of which the west area is supplied by 1 # reservoir and the east area is supplied by 3 # reservoir. 1. The water source project uses groundwater as the water source for the sprinkler irrigation system in the project area, and the water output of the pump well is 80m3/h. First, the deep submersible pump is used to pump water from the deep well to the 1 # and 3 # reservoirs for water supply, and then from the reservoir to the sprinkler irrigation system through the sprinkler irrigation head hub. 2. Layout of pipeline system (1) Classification of pipeline system Due to the large area and complex terrain of the micro sprinkler irrigation area, the pipeline system of micro sprinkler irrigation is divided into three levels, namely, main pipe, branch pipe and capillary pipe. (2) Pipe network layout form The pipe network layout form adopts tree pipe network, the main pipe and branch pipe are arranged perpendicular to the contour line, and the capillary pipe is arranged parallel to the contour line. 3. Selection and combination form of micro sprinkler (1) Selection of micro sprinkler The soil type of this irrigation area is light soil with fine texture. The main performance indicators of the micro sprinkler are: the design working pressure of the sprinkler is 150KPa, that is, 15.3m water column, the sprinkler flow is q=182.4 (L/h)=0.1824 (m3/h), the spraying diameter is D=9.6 m, and the nozzle diameter is d=2.0 mm. (2) Micro sprinkler combination type The micro sprinkler irrigation area is located in the loess hilly area in the north of Taiyuan urban area. It is severely dry in spring and summer, and the wind speed is high. Considering the layout spacing of branch pipes, the square combination is adopted. (3) The design range of micro sprinkler is 3.4 meters; Micro sprinkler spacing is 4.8m; The capillary spacing is 4.8m; The spraying time of single micro sprinkler at one position is 1.23h; Spraying time of sprinkler combination (4 micro sprinklers) is 0.31h; The control area of four micro sprinklers is 0.007 hectares, and a total of 1300 sprinklers are required. (4) Hydraulic calculation of pipeline (a) capillary parameters: capillary flow is 2.74m3/h, capillary diameter is Φ 25mm, and economic flow rate of pipeline is 2.0m/s. The total length of the capillary in the control area of 1 # and 3 # tanks is 68858m. (b) It is determined that the branch pipe parameter is 13.68 m3/h, the diameter of the branch pipe is Φ 50 mm, and the total length of the branch pipe is 2650 m. (c) The main pipe parameters are determined as follows: the main pipe flow is 54.72 m3/h, the diameter of the main pipe is Φ 110mm, and the total factory degree of the main pipe of the micro sprinkler irrigation system is 3250m. (5) The diesel self-priming vacuum pump 8060 shall be selected for the injection system. 2、 Construction management Our company strengthens the implementation management of the project, organizes the construction company to carry out project construction according to the construction organization design and project implementation plan, and dynamically controls the project quality, progress and investment. Our company will construct carefully according to the design, drawings and technical standards, and accept the supervision and inspection of the quality and technical supervision team. 3、 The progress management shall be carried out in strict accordance with the project schedule, and the construction period shall be shortened as far as possible on the premise of ensuring the project quality. The construction of each single project shall be connected reasonably to ensure the realization of the project progress target.