Analysis of investment factors of pumping station project?

With the deepening of the economic system reform in the Pearl River Delta, the regional economic development and urbanization process are accelerating, and the urban population is becoming more and more dense. Because of the low-lying terrain and easy waterlogging, the economic losses and people's production and life in waterlogged areas are increasingly affected. In order to ensure the sustained and healthy economic and social development in waterlogged areas and improve the drainage standards, it is necessary to build some pumping stations. The expansion project of Guanshan Pumping Station in Nanhai District, Foshan City is a large (2) type with a total installed capacity of 5200kW and two vertical axial flow pumps. The drainage flow is 68.44m3/s, and the estimated investment is 81.91.2000 yuan, and the unit kilowatt investment is 1.575 million yuan. This project started on 20 1 1, 10 and was completed on 20 12 and 15. Another large (2) pumping station project is the reconstruction project of Beicun waterlogged area, with a total installed capacity of 4800kW, three vertical tubular pumps, and the drainage flow 1 18.2 m3/s, with an estimated investment of 222.373 million yuan and an investment of 46,330 yuan per kW. It can be seen from the engineering investment and unit kilowatt investment of the above two pumping stations that there is a big difference between them. The main factors affecting the project investment in the design of two pumping stations are analyzed and compared below.

2. The main factors affecting the investment of pumping station project

2. 1 Hub Layout

2. 1. 1 installed capacity and number of units

1) The expansion project of Guanshan Pumping Station is designed with a net lift of 3.89m, a total lift of 5.07m, a maximum net lift of 5.2 1m and an average net lift of 2.0m m. According to the survey of domestic manufacturers and the number of units in Guanshan Pumping Station, two 2900ZLQ32-5 vertical axial-flow pumps with a total installed capacity of 5200kW are selected in consideration of the space limitation in the middle island. 2) The designed net lift of Beicun Pumping Station is 1.55m, and the total lift is 2.11m; The maximum net lift is 2.82m, and the average net lift is 1 .44 m. According to the drainage design flow and lift requirements of this project, referring to the pump type selection practice of low-lift and large-flow pumping stations built at home and abroad and in Guangdong Province, combined with the long and narrow terrain of the site, it is recommended to adopt the scheme of three 3200ZGB 39.5-2.1kloc-0/vertical tubular pumps for investment. Obviously, the more units, the greater the investment in mechanical and electrical equipment and installation projects.

2. 1.2 Layout of main pump house and floodgate

1) Two vertical axial flow pumps are arranged in the main pump room of Guanshan Pumping Station [1] expansion project, with the distance between the centers of the units of 8.5m, the length of the main building 18.6m and the width16.7m; The auxiliary workshop is arranged on the side of the main workshop near the existing Guanshan pumping station and is integrated with the main workshop. The width of auxiliary workshop is 10.3m, the length is 16.7m, and the height of main workshop is about 37m. The pump house covers an area of 722.5m2, and the downstream direction of the sluice gate is 1 1.0m and the vertical direction is 2 1.6m, which are arranged in four holes. 2. Part of the civil engineering investment is 34,462,300 yuan. 2) Three vertical tubular pumps [2] are arranged in the pump house of Beicun Pumping Station, with the center distance of the pump house being 1 1.0m, the length of the main powerhouse being 35.0m, and the width being 21.0m. The auxiliary powerhouse is arranged outside the main powerhouse, and the lower part is the outlet section of the pump house outside the river, which is integrated with the main powerhouse. The auxiliary workshop is 47.22 meters long and 8 meters wide. The pump house covers an area of1875.3m2. Due to the terrain limitation, the sluice gate is divided into three independent opening and closing operation rooms. Each opening and closing operation room is 8.4m long in the downstream direction and 12.2m long in the vertical direction, with two holes. The second part of the civil engineering investment is 52,552,800 yuan. Beicun Pumping Station has 1 set more than Guanshan Pumping Station Extension Project, and the pump room area is 2.6 times that of his. At the same time, the structure of the spillway gate has also increased accordingly. The investment in the two parts of Beicun Pumping Station is1809,500 yuan more than the expansion project of Guanshan Pumping Station. It can be seen that the more units, the larger the layout area of the main pump house and flood gate, and the greater the civil engineering investment.

2. 1.3 Waijiang exit culvert

1) The Waijiang outlet culvert of Guanshan Pumping Station Extension Project is a pressure reinforced concrete box culvert, which is divided into four sections, with a clear height of 3. 1m, a clear width of 3.6m and a total length of 64m. The civil construction investment of export culvert is 2.881.5 million yuan. 2) The outlet culvert of Beicun Pumping Station is also a pressure reinforced concrete box culvert, divided into 1 1 sections, with a total length of 172.709m, a clear height of 4.64m and a clear width of 4.9m, and a civil investment of1900140000. The length of the outlet culvert of Beicun Pumping Station is 2.7 times that of the expansion project of Guanshan Pumping Station, and the width and height of the single-hole structure are also increased. The investment in civil works of the outlet culvert is more than that of the expansion project of Guanshan Pumping Station 16 1 19900 yuan. Therefore, the longer the culvert at the outlet of Waijiang River, the higher the investment in civil engineering.

2. 1.4 earthwork excavation and foundation treatment

1) Earth excavation 106800 m3, stone excavation 19600 m3, earthwork backfilling 40000 m3, excavation and filling project investment 10234400 yuan. The demolition project is 3,765,438+10,000 yuan. Do you need to remove the inflowing soft foundation? 500 cement mixing pile treatment, pumping station, external surge, etc. All natural foundations are adopted. The investment of foundation treatment project is1306,300 yuan, and the total investment of earthwork and foundation treatment project is1191kloc-0/700 yuan. 2) The earthwork excavation of Beicun Pumping Station is 2 1.33 million m3, the stonework excavation is 1.67 million m3, the earthwork backfilling is 88,600 m3, and the excavation and filling project investment is 1. 1.2946 million yuan. The demolition project is 6.5438+0.6575 million yuan. Water inlet, pumping station and water outlet are all soft foundations, so precast concrete piles (? 400) and punching cast-in-place pile for pump house foundation, and the foundation treatment fee is 4,424,400 yuan. Total investment of earthwork and foundation treatment project17,376,500 yuan. The earthwork and foundation treatment project of Beicun Pumping Station is more complicated than the expansion project of Guanshan Pumping Station, and the project investment is 5,464,800 yuan more than the latter. The main project covers a large area, and the earthwork excavation and filling investment is large; The foundation treatment cost of soft soil foundation is higher than that of natural foundation.

2.2 Temporary Works

1) During the construction of the expansion project of Guanshan Pumping Station, Guanshan Watergate and the existing Guanshan Pumping Station were blocked, and Guanshan Ship Lock was used for diversion. The cofferdam for lateral water inflow construction is 291.36m long and the maximum height is 5.5m.: The total length of the cofferdam for Waijiang construction is185.5m, and the maximum height is 6.5m, all of which are filled with sand. Most of the foundation excavation does not need supporting treatment, and the part near Guanshan Pumping Station is supported by bolts. Temporary works are relatively simple, with an investment of 6,223,800 yuan. 2) During the construction of Beicun Pumping Station, 3 holes on the right bank of Beicun Sluice will be blocked, and the remaining 5 holes on the left bank will be used for diversion. The construction cofferdam is also equipped with inflow river and outer river construction cofferdams, with a total longitudinal length of 348 meters and a maximum height of 5.5 meters. Using homogeneous soil cofferdam, two layers of composite geomembrane are set on the water surface; The longitudinal total length of the cofferdam for Waijiang construction is 228m, and the maximum height is 6.5m.: Fill the purchased medium-coarse sand, lay two layers of composite geomembrane on the water surface, and protect the feet and surfaces with nylon soil bags. The main project is supported by bored pile in foundation pit, and the temporary project is complicated, with the project investment of 21558,800 yuan, which is more than the temporary project investment of Guanshan Pumping Station Extension Project1535,000 yuan. Using foundation pit support construction, its temporary project investment is larger than that of general construction methods.

2.3 Compensation for Land Acquisition and Demolition of Station

1) The expansion project of Guanshan Pumping Station is located at the intersection of Guanshanchong Exit of Xiqiao Town, Nanhai District, Foshan City and Shunde Waterway of Beijiang River (next to Guanshanshui Shiplock). The drainage control area is mainly distributed above the Guanshan outlet and within the boundary of Qiaosang. In order to meet the drainage requirements, avoid the influence of new land acquisition and demolition, and facilitate the construction and management of the project, the expansion pumping station is selected and arranged on the middle island between the existing Shanda pumping station and the sluice. The construction land of the project is the management land of Shanda Pumping Station, and there is no need to add land acquisition and resettlement. However, the project construction needs to dismantle the three-story office building with frame structure between the existing Guanshan Pumping Station and the sluice above the outlet culvert of the proposed pumping station, with a construction area of about 4 17m2, and the 1 storey brick-wood structure flood control warehouse with a construction area of about 429m2. Temporary land occupation includes garbage dumps, construction roads and land for construction, production and living facilities. The compensation for demolition of the whole project is 2,462,200 yuan. 2) Beicun Pumping Station Project is located next to Beicun Sluice in dali town, Nanhai District, Foshan City. The left bank of Beicun Sluice in Yayao Waterway is a commercial plot with many buildings, which is difficult to remove and has high cost. Therefore, the location of the pumping station can only be considered in the south of Beicun sluice. In order to save land and facilitate demolition, the newly-built pumping station is arranged as close as possible to the sluice. This project does not involve the immigrant population, and the land use scope includes: ① The total permanent land area is * * * 2.9hm2②; ② The total temporary land area is * * * 4.399hm2③; ③ The house demolition is 9765.76m2, mainly involving the demolition of three commercial buildings; ④ Professional projects: relocation of power line facilities 1, relocation of communication facilities 3, relocation of gas pipeline 1, relocation of rainwater pipeline 1, relocation of main water pipe 1, relocation of traffic lights at intersections 1, road repair damaged by off-site traffic and construction 1. According to the local land acquisition and demolition plan, the impact of land acquisition and demolition is solved by one-time monetary compensation, and the compensation price involved in the project line reconstruction is calculated according to the quotation of the corresponding ownership unit. The total compensation for land acquisition and demolition of Beicun Pumping Station is 6.551.1.7 million yuan, which is 63.0495 million yuan more than the compensation for the expansion project of Guanshan Pumping Station. The more urban land acquisition and demolition, the higher the compensation cost.

2.4 Access system and others

Investment in expansion project of branch line reconstruction project of access system of Guanshan Pumping Station118130,000 yuan. The investment in the incoming cable project of the access system of Beicun Pumping Station is 6,892,500 yuan, and the investment in the access system of Beicun Pumping Station is 5,765,438+0.10.2 million yuan more than the expansion project of Guanshan Pumping Station. The investment of access system is related to whether there is a convenient power supply nearby. Small capacity and short line can save the investment of access system. Whether the pumping station is equipped with self-discharge sluice, control sluice and other facilities also has a certain impact on investment. The expansion projects of Guanshan Pumping Station and Beicun Pumping Station have no self-discharging sluice and control sluice.

3 analysis

The static total investment of pumping station project generally consists of hub project, compensation fee for land acquisition and demolition, independent fee, basic reserve fee and special access system. Hub projects include construction projects, mechanical and electrical equipment and metal structures and installation projects, temporary projects and environmental protection projects; Independent expenses and basic reserve expenses are mainly related to the construction cost of the main project, and are generally calculated according to the rate. On the premise that there is little difference between the project unit price consideration method and the price level, excluding human factors, it can be seen from the comparison of hub layout and investment of the above two pumping stations that the main factors affecting the investment of pumping stations can be divided into two categories: the construction cost of hub projects and the compensation for land acquisition and demolition. The main difference in the cost of the hub project lies in the investment in the civil works of the pump house and spillway gate, the electromechanical and metal hub equipment and installation, the drainage culvert outside the river, the earthwork excavation and foundation treatment, and the temporary works. Beicun Pumping Station is 64451.4000 yuan more than the expansion project of Guanshan Pumping Station, the compensation for land acquisition and demolition is 63049500 yuan more, and the special project of access system is 57 1.65438+. * * * Total investment 1332 1.2 1 ten thousand yuan. According to the installed capacity of Beicun Pumping Station of 4800kW, the investment per kW is 27,750 yuan. Therefore, under the premise that the unit price of the project is basically the same, the main factors that affect the investment of the pumping station project are the location of the pumping station, the installed capacity and number of units of the hub project, the length of the culvert outside the river, earthwork excavation and filling, foundation treatment, temporary works, access system and other supporting projects. If the pumping station is located in a densely populated urban area, the compensation for land acquisition and demolition will inevitably be more; The pumping station has a low lift, so only tubular pumps can be selected, and the number of units is large. The structural dimensions of the pump house and sluice gate are increased, which increases the investment in civil engineering, electromechanical equipment, metal structure and installation engineering; The distance between the outer river and the pump house is far, and the outlet culvert is long, so the investment will also increase; The pumping station is a soft foundation, so the investment in foundation treatment and temporary works will naturally increase. The more special supporting projects such as access systems are connected, the greater the investment will be. In addition, when comparing the investment per kilowatt of all pumping stations, there are sometimes deviations. For example, in the expansion project of Guanshan Pumping Station, the installed capacity of Beicun tubular pumping station with a low lift of 2. 1 1m is 0.46 times that of axial flow pump. If the installed capacity is basically the same, the drainage flow needs to be increased accordingly. In fact, the purpose of drainage pumping station is to drain stains. The unit flow investment of Beicun Pumping Station is188.120,000 yuan, and the unit flow investment of Guanshan Pumping Station Expansion Project is1196,800 yuan. The unit flow investment of Beicun Pumping Station is large, which is mainly related to the large compensation investment for land acquisition and demolition. It is more reasonable to compare the unit flow investment of pumping stations.

4 conclusion

To sum up, the main factors affecting the investment of pumping station project are hub layout, compensation for land acquisition and demolition, special access system and other supporting facilities. In the design, priority should be given to locations that do not need land acquisition or are far away from urban residential areas and convenient water outlets. Secondly, the unit with high lift and suitable for vertical axial flow pump should be selected. The number of units should not be too large, so that the layout scope and structural size of the hub are small, the foundation treatment and temporary works should be saved accordingly, and supporting facilities such as special channel system should be considered to make the overall scheme of the pumping station as technically feasible and economically reasonable as possible.

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