② Earthwork excavation and filling slope cutting earthwork excavation and filling must meet the requirements of design drawings.
Project overview 1.1.
At the same time, the error between the ground elevation and the design elevation after paving shall not exceed 3cm.
supervision unit: Supervision Department of environment and water and soil conservation project of Bobona hydropower station of Henan Kehua Engineering Consulting Co., Ltd.
Project name, location and task Bobona hydropower station is located in langru Township, the middle reaches of Karakash River in Hotan County, Xinjiang.
After the foundation pit is excavated, the bearing capacity of the base shall be inspected (the bearing capacity of the base shall be greater than 500kPa).
2.
2.1.
During masonry, poles must be erected on both sides to hang lines, and the external lines shall be straight and neat.
(4) the planning of wind, water, electricity, construction roads and lighting shall be unified, standardized and standardized to fully reflect civilized construction and management.
2.
The excavation sequence is from top to bottom, the soil is transferred upward while excavating, and loaded into bulldozer or loader.
The backfilled topsoil shall be free of stones (pebbles), sand gravel, grass roots and other sundries.
③ After the excavation and treatment of the foundation pit of masonry foundation, check the size and elevation of the base, and lay the foundation after it is qualified.
Location: Bobona hydropower station project, 79 ° 33 ‘east longitude and 36 ° 53’ north latitude, has a reservoir capacity of 398.65m3 and a total installed capacity of 150KW.
Construction layout basis and principle: in combination with the construction environment and construction characteristics of the project, the construction plane layout shall be carried out according to the following principles: ⑴ all temporary facilities, construction auxiliary enterprises and construction roads shall be arranged in combination with the actual situation of the site, so as to minimize the transportation distance from each working face, and in line with the principles of favorable production, convenient life and easy management.
All stones shall be set on the fresh mortar.
That is, it should not only meet the requirements of centralized management and unified deployment, but also meet the division of labor and cooperation to ensure safe use.
1.2 contract duration the commencement time of the contract project is August 1, 2012 and the completion time is October 30, 2012.
In order to effectively implement water and soil conservation measures and effectively control new water and soil loss, the protection and treatment measures for the protection of permanent waste dump and dam construction area are emphasized.
If the bearing capacity fails to meet the requirements, it shall be treated.
The thickness of the layer meets the requirements of the design specifications and effectively ensures the quality of topsoil.
The masonry shall be poured in layers.
(2) the scale and capacity of temporary facilities shall be planned and designed according to the needs of overall construction progress and construction intensity.
Before the mortar is solidified, all joints shall be full of mortar and the stones shall be fixed in place..
On the premise of meeting the construction requirements, try to be simple and practical, adapt to the characteristics of each construction period, coordinate and cooperate with each other to avoid interference.
The main task of the project is power generation.
(2) Covering soil paves the collected planting soil on the soil block.
The power station is about 30km away from the upstream Wuluwati Water Control Project, the dam site is 2.85km away from Wuluwati Water Control Project, and the power station is 41km away from Hotan city.
(3) The process flow of slope cutting is mainly as follows: Surveying and setting out – earthwork excavation and filling ① surveying and setting out to determine the excavation range, depth and slope according to the design drawing.
The relatively long and short stones shall be paved alternately, and there shall be no through joints between the upper and lower layers.
Construction profile 2.1.
In the process of Strengthening Masonry, the template hanging line or two vertical poles hanging line shall be adopted.
During the construction process, the line pole shall be often corrected to ensure that the dimensions of each part of the masonry meet the requirements of the drawing.
During masonry, the poles shall be corrected frequently to ensure that the dimensions of each part of masonry meet the requirements of the drawings.
3.
To avoid mechanical disturbance of undisturbed soil or over excavation.
Block stone, cement, sand and other materials used for building retaining walls must be tested and qualified before use.
1.3 relevant units of the project construction unit: Xinjiang Xinhua Bobona Hydropower Development Co., Ltd.
The actual excavation contour line must meet the excavation line, horizontal dimension and elevation requirements shown in the design documents or specified by the supervisor on site.
② The foundation pit shall be excavated with excavator to the design elevation + 20cm soil.
Bobona hydropower station project was basically completed in April 2011 and is currently in trial operation.
④ The setting out of the mortar wall body shall be carried out after the foundation pouring.
(4) The process flow of masonry retaining wall is mainly as follows: Measurement and setting out – ditch pit excavation, t-masonry stone foundation, t-masonry wall body, wall back backfilling and maintenance ① measurement and setting out, construction setting out shall be carried out according to the plane position, elevation and geometric dimension designed in the drawing, and marked with lime.
The total construction period is 4 months.
The wall body is built with M20 cement mortar.
The soil shall be transported and backfilled where the local height difference is large, and the filling area shall be bulldozed and compacted by bulldozer.
Large and flat stones shall be selected as corner stones and facing stones.
If any, it must be completely removed.
The project belongs to Sichuan and other projects, and the project scale is medium-sized.
The inner and outer lines shall be straight and neat, and the outer slope shall be closed layer by layer.
Each working layer shall be roughly leveled.
The thickness is greater than 30cm.
When building the first layer, wet the foundation and then build mortar.
The backfilling shall be carried out in stages.
Construction steps and requirements (1) after land leveling, the uneven land after disturbance shall be leveled by mechanical cutting and filling.
During excavation, the excavation depth shall be strictly controlled, and 20cm shall be reserved for manual excavation, so as to control the slope and avoid start-up and underexcavation.
2 ~ 3 layers are a working layer.
Summary report on construction of water and soil conservation project 1.
design unit: Xinjiang water resources and Hydropower Survey, design and research institute construction unit: Xinjiang Sutong Engineering Construction Co., Ltd.
2.1.
The foundation is M20 cement mortar masonry block stone.
Construction traffic (1) external traffic mainly uses uruwati access road as external traffic.
Construction layout 2.1 1.
(3) the layout of all temporary facilities shall be compact, reasonable, flexible, safe, reliable and easy to use.
The raw soil shall be filled first and then the cooked soil.
During leveling, the principle of proximity shall be adopted according to the topographic fluctuation, and the balance of excavation and filling shall be achieved as far as possible.
