Model text of drainage construction scheme 1
The innovative service center project occupies the original ditch. During spring irrigation, the amount of water is relatively large, and the original temporary side ditch can not meet the drainage requirements, which may cause about 30 mu of farmland to be flooded. It is necessary to dig through the original side ditch to prevent problems before they happen and solve the drainage problem. After field investigation, the following implementation opinions are put forward:
A, temporary drainage construction location
In order to ensure that the original ditch can be drained again, it is necessary to dig a new temporary drainage ditch of about 50m, which is located in the northwest of the Entrepreneurship Center (see the attached figure for details).
Second, the engineering quantity is expected
After field investigation and referring to the original river course, it is planned to dig a new temporary ditch with a bottom width of 3m, an upper bottom width of 5m and a depth of 2.5m The earthwork excavation amount is about 500m3.
Third, the project contract price
The comprehensive unit price of earthwork excavation of temporary drainage ditch is calculated by 8 yuan/square. The total contract price of this project is 4000 yuan.
Fourth, the determination of the contractor
Shangyi Town is responsible for determining the project contractor, and suggests that the general contract price of the project be controlled within the above range.
Model essay on drainage construction scheme II
1, process
Measurement and setting-out project? Foundation pit excavation project? Foundation pit cleaning project? Concrete cushion filling project? Trench wall masonry project? Trench wall plastering project? Drainage ditch cover plate project? Inspection and acceptance
2, material requirements:
1) Bricks for masonry: varieties, specifications, appearance, strength and quality grade must meet the design requirements. Bricks should have a product quality certificate when entering the site, and should be sampled for re-inspection after entering the site, and their quality should comply with the relevant provisions of the current national standards.
2) Cement: 32.5 ordinary portland cement or slag portland cement is generally used. Cement should have product quality certificate and factory inspection report when entering the site. After entering the site, samples should be taken for re-examination of necessary properties such as strength and stability, and the quality must conform to the relevant regulations of the current country.
3) Sand: medium and coarse sand with hard and clean texture shall be adopted, and the sand content and mud content shall not exceed 3% after passing through a sieve with a 5mm aperture. The variety and quality of sand should meet the relevant requirements of the current national standards, and should be sampled and tested as required after entering the site.
3, the operation method
1) When excavating foundation trench or pipe trench, the excavation sequence, route and depth shall be reasonably determined. Earthwork excavation shall be carried out in layers and sections from top to bottom. In the process of excavation, the state of groove wall and slope should be checked at any time to prevent collapse. When excavating foundation trench and pipe trench, it is forbidden to dig below the design elevation. If the design basement elevation cannot be accurately excavated, a layer of soil can be temporarily left above the design elevation for manual excavation after leveling. ? Where mechanical construction can't dig, we should cooperate with manpower to dig at any time, and transport the soil to the place dug by machinery with trolleys so that it can be transported away by machinery in time.
2) Help repair and bottom cleaning.
A after the tank bottom is repaired and leveled, quality inspection and acceptance shall be conducted.
B, earthwork excavation of foundation trench, when there are conditions to pile up in the site, must leave enough good soil needed for backfilling; Excess earthwork should be transported away at one time to avoid secondary transshipment.
3) Concrete cushion construction
A formwork: the height of formwork is the same as the thickness of concrete cushion. Template adoption? [? U-shaped channel steel, the iron solder on one side of the channel steel is driven into the base for fixing. The top surface of formwork should be flush with the top surface of concrete slab and consistent with the design elevation, and the bottom surface of formwork should be close to the top surface of foundation. After the formwork is installed, it is recommended to check whether the height difference between the formwork joint and the inside of the formwork is dislocation and irregular. If it is correct, evenly coat a thin layer of release agent on the inside for demoulding.
B transportation of concrete: concrete is mixed on site and transported by special vehicles. Evaporative water loss and hydration water loss (refers to the hydration reaction of cement after mixing, which reduces its fluidity) and the segregation of concrete due to bumps and vibrations during transportation should be considered. To reduce the influence of these factors, the key is to shorten the transportation time and take appropriate measures to prevent water loss and segregation. The concrete is sent to the paving site for paving, vibrating and leveling, and the longest allowable time until the pouring is completed is determined by the laboratory according to the initial setting time of cement and the construction temperature. In the process of loading concrete mixture, slurry leakage is not allowed to prevent segregation. The height of discharging when paving shall not exceed1.5m. When there is obvious segregation, it shall be re-mixed when paving.
C, dismantle: 24 hours after concrete pouring, carefully dismantle the formwork to avoid damaging the edges and corners of the concrete slab, and try to keep the formwork intact. After form removal, trampling is allowed only when the strength of the concrete slab reaches more than 80% of the design strength.
4) Masonry works
A, masonry mortar should be determined by trial mixing. When the composition materials of masonry mortar change, the mixture ratio should be re-determined.
B, mortar mixing at the scene, each component material should be measured by weight. Drainage ditch masonry will adopt? Trinity method? That is, a shovel of ash, a brick, and a squeeze. Ensure that the vertical mortar joint of the drain wall is full and the mortar joint thickness is uniform.
C, the trench wall is plastered with cement mortar twice, the bottom layer is 13mm thick 1: 3 cement mortar, and the top layer is 7mm thick 1: 2 cement mortar.
5) Reinforced concrete cover plate project
A, pay attention to safety during transportation and loading and unloading, educate construction personnel to pay attention to safety and enhance safety awareness. When loading, unloading and placing the cover plate, a certain slope must be maintained. The concrete cover plate must be lifted by two people at the same time during installation, and attention should be paid to avoid injury when it is placed at the top of the ditch. When installing each cover plate, surveyors must check its elevation.
B, installation cover plate meets the requirements, prefabricated cover plate installed on the drain pipe, flat and firm when installation, accurate position, straight line and smooth curve.
6) Earthwork backfill project
After the cover plate is installed, after cleaning the garbage in the groove around the inner ring groove, silty clay or well-graded crushed stone soil and sand soil are selected as backfill soil. The content of organic matter in soil shall not exceed 5%, and shall not contain frozen soil or expansive soil, and the water content shall meet the specified requirements. Silt, cultivated soil and topsoil of the site shall not be used. Backfill compaction coefficient is not less than 97%.
Model essay on drainage construction scheme 3
I. Compilation basis:
1. Construction drawing of water pipe network reconstruction in Wuhou District, Chengdu provided by the construction unit.
2. Code for Construction and Acceptance of Water Supply and Drainage Pipeline Engineering (GB50268? 50268)。
3. Standard for Inspection and Evaluation of Urban Road Drainage Pipeline Engineering (CJJ3-2008).
4. Code for Acceptance of Construction Quality of Building Foundation Engineering (GB50202-2002).
5. Code for Quality Acceptance of Masonry Engineering (GB50203-2002).
6. Code for Acceptance of Construction Quality of Concrete Structure Engineering (GB50204-2002).
7. Our company investigated the current situation around the project area, ditches, roads and distribution lines.
8. Site conditions, surrounding environment and site leveling.
Second, the preparation principle:
1, principle of safety first: organize construction on the premise that safety measures are put in place to ensure foolproof.
2. The principle of ensuring the construction period: according to the requirements of the construction period, make a scientific, reasonable and thorough construction plan, arrange the progress reasonably, ensure the realization of the construction period objectives and meet the construction period requirements.
One: process flow: measuring and setting out? Measure the water level? Drainage? Measure the elevation of silt surface? Dredge? Layout bottom elevation after dredging? Turn it over? Discard the silt.
Third, measuring unreeling
1. According to the measured elevation pile and axis pile, the dredging range and elevation are involved in the whole road section, and the dredging range is determined by multi-point average method.
2. After the reservoir water is drained, measure the upper surface elevation of silt at one time, and determine the upper surface elevation by multi-point average method.
3. After dredging to the designed soil layer, the soil layer elevation determined by the design should be measured after the design is confirmed, and the dredging elevation should also be determined by multi-point average method.
Third, drainage.
Pump (100) and multistage centrifugal pump (150) are used to discharge the pond water to the nearby open space, which will not pollute the surrounding environment.
1, the technology is ready for deployment.
1) data collection, topographic, engineering geological and hydrogeological data analysis of this project, and topographic survey of the construction site.
And determine the traffic, temporary roads and plane layout of the construction site.
2) Be familiar with the design drawings, understand the design intent, master the drawing requirements, and determine whether the construction drawings meet the construction conditions.
3) Organize technical symposiums to determine the major issues and principles of this project in terms of machinery, equipment, materials, construction scheme of main divisions, construction measures of key parts and key working procedures.
4) Conduct construction organization design disclosure, and conduct technical and safety disclosure in stages.
2. Allocation of labor, materials and machinery.
According to the construction project, the labor force is equipped with: general workers, mechanics and other types of work. Management technicians: project manager, project technical director, builder, quality inspector, safety officer, material engineer and budget engineer.
Fourth, draw still water. According to the site situation, there is not much water, but some water affects the construction, so the project needs to prepare pumping machinery. Baxi water pump, 3 3-inch or 2.5-inch submersible pumps, 3 sewage pumps and supporting generator sets. Pumping existing stagnant water.
5. According to the site conditions, the river is wide, thick and dry with low humidity. However, excavators are easy to get stuck in silt, which seriously affects the construction safety and progress. It is suggested that the excavator on the north shore should be cleaned and backfilled. Because the silt is dry and sticky and difficult to flow, the excavator can clean it up, throw it into the open space on the shore, and quickly fill it with earthwork or muck and tamp it. Mechanical cleaning step by step, step by step. The south bank adopts the same method, but due to the complicated site conditions, it is suggested to use a dual-purpose waterway excavator to clean and backfill when necessary.
Six, when necessary, you can directly call the waterway dual-purpose excavator to clean up the silt, but the river is wide and needs 4? Six times.
Seven, backfill earthwork, the basic need to sinotrans, some earthwork suggested to take nearby. Due to the limitation of road conditions, it is necessary to consider increasing the number of transport vehicles and working at night when transporting earthwork and silt. When cleaning up the silt, we will immediately send manpower to clean up the earthwork scattered on the road to provide a good living environment for the surrounding citizens. We need to dry the sludge before transporting it.
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