◆ Project overview
◆ Difficulties and impacts of engineering technology
Key factors of schedule and quality
◆ Bid commitment
◆ Scope, basis and principle of tender preparation.
The first section general situation of the project
1. 1 project description
The project covers an area of about 2.5 square kilometers, surrounded by Huanzhen Road, with Xinzhen Road and Wei Yi Road in the east and west, Jingyi Road and Jinger Road in the north and south, with a total length of 8,700 meters. ..
Among them, Jingyi Road has a total length of 860m (from Huanzhen Road to Huanzhen Road), including bridges, culverts, rainwater pipes, sewage pipes, manholes, lighting, landscape and other ancillary works.
1.2 project area environment
◆ Engineering topography and hydrological conditions
This project is low-lying, and there are open dikes and hidden dikes within the project scope. After entering the site, the open and hidden river banks should be treated first, and the cultivated soil should be eradicated.
◆ Traffic conditions near the project.
According to the current traffic conditions, the roads from Song Jia exit of Shanghai-Nanjing Expressway to Anting Town and along Moyu Road to Anting New Town are relatively smooth, and the temporary roads for construction mainly rely on the existing concrete service roads in the village.
◆ General situation of engineering geology
land
quality
time
Detu
ground
1 soil layer name molding layer thickness
(m) bottom layer
altitude
(m) Describe the state of compressible soil layer.
accomplish
new
produce
Q4① Fill 0.4
~
2.5 3.92
~
1.04 loose soil is mainly cultivated soil, containing plant roots. This layer is complex in composition and loose in structure.
② 1 yellow
Muddy clay coast
~
Hekou 0.5
~ 1.7 2.64
~
1.59 plastic iron oxide manganese spot.
② 2 grayish yellow
Silty clay 0.6
~
1.6 1.64
~
0.59 ruansu
~
Flowing plastics
~
High silt sand, containing manganese spots of iron oxide, partially missing.
② 3 grayish yellow to gray
Clay silt 1. 1
~
7.8 1.44
~
-5.50 Slightly closely mixed with a thin layer of cohesive soil, with uneven soil quality and mother crumbs, which is river sediment.
③ 1 gray muddy silty clay gray silty sand coastal area
~
Hekou 0.6
~
8.6 -2.0 1
~
-7.62 In flow molding
~
The high soil quality is uneven, and the local soil quality is good, so it is moderately compressible silty clay.
③ 2 gray
Clay silt 0.6
~
3.6 -5.69
~
-9.59 is slightly dense, the soil is uneven, and there are many silty sands in some areas, which are drilled through holes ZK 10L, JK 10 and ZK 17.
③ 3 Gray muddy soil
silty clay
1.0
~
3.8 -6.43
~
-10. 19 plastic flow is mixed with thin layer of silty sand, with uneven soil quality, and holes such as ZK 19 ~ ZK2 1 and ZK3~JK5 are not drilled through.
④ 1 dark green to yellow
Silty clay estuary
~
The lake and swamp have not been drilled yet.
-1 1. 16 middle and lower hard plastic mixed with silt, containing manganese iron oxide spots, partially missing.
1.3 general situation of road engineering structure
◆ Motor vehicle lane
3 cm fine grained asphalt concrete
8cm coarse-grained asphalt concrete
40cm fly ash three slag
15cm gravel sand
◆ Non-motor vehicle lanes
16cm cement concrete surface C30
15cm concrete foundation C 15
10cm gravel sand
◆ Sidewalk:
Precast colored cement concrete pavement slab (250×250×40)
10cm concrete foundation C 15
5cm yellow sand pad
A row of precast concrete side slabs
Analysis of characteristics and difficulties of 1.4 project
◆ The construction line is long, the project schedule is tight, and the construction organization requirements are high.
◆ The engineering foundation belongs to soft soil foundation with large light and dark banks.
◆ The construction involves Huangmei rainy season and typhoon season, and natural factors have great influence.
◆ There are many construction units within the scope, involving all aspects of work.
The second quarter about engineering technical difficulties and key points affecting the progress quality
According to the characteristics and difficulties of the project summarized in 1.4, the construction technical difficulties, quality control difficulties and unfavorable factors that may affect the progress, safety and civilized construction of the project are analyzed, and the preventive measures and corresponding countermeasures are formulated accordingly. If our company is lucky enough to win the bid, we will carry out the construction in strict accordance with the following control measures to ensure the realization of the scheduled goals in terms of project progress and quality. These targeted measures will be taken as part of the contract together with the bid commitment.
2. 1 Key points of technical difficulty control and quality control
2. 1. 1 Quality control of Goubangcai
There are a large number of ditches, ponds and various hidden dikes in the project site. According to the analysis of current road engineering examples, the quality problem of embankment filling is a common problem in road engineering construction. The quality of embankment filling is not up to standard, and roads often collapse in large areas, uneven settlement, and a large number of cracks and cracks appear. Our company pays full attention to the direct relationship between embankment quality and future road service life. We will determine the layered thickness and compaction index of the filling layer according to the test section, and strictly control these technical indexes in the process; At the same time, strictly control the water content of filling materials, strengthen the detection in the process, and take correct filling measures in combination with the requirements of technical specifications for engineering construction to ensure that the compactness of embankment filling reaches the standard of ≥ 95%.
2. 1.2 Soft soil foundation treatment
Most sections of this project need foundation treatment, and at the same time, local ponds and rivers that the road passes through need to be replaced and compacted, which has a heavy workload and a great impact on the quality of the project foundation.
In order to ensure the engineering quality and minimize the post-construction settlement of road subgrade, we will strictly regulate the foundation treatment. Avoid the influence of rainy season construction as much as possible, carry out overload preloading as soon as possible, accelerate the consolidation of underground soft cushion water, reduce the post-construction settlement of subgrade, and adopt equal load preloading and overload preloading for subgrade according to different conditions.
2. 1.3 subgrade filling quality control
In the process of subgrade filling, in addition to compaction by layers in strict accordance with the design and specification requirements, the water content of subgrade filling will be strictly controlled: the water content of subgrade is an important factor to control the pavement settlement and the smoothness of abutment pavement interface, ensure the subgrade load level, ensure the smoothness of pavement paving, and control the settlement and cracks. During the construction, our company will strengthen the quality control of filler and fly ash, control the layered thickness and loading speed, and do a good job in settlement monitoring; Strengthen the detection of filler moisture content and strictly control the moisture content; Control the compactness and smoothness of subgrade and abutment filling to prevent pavement cracks, uneven settlement and bump at the bridge head.
2.2 control the key factors affecting the project progress, safety and civilized construction.
2.2. 1 construction organization
The total length of this bid section is 860m, and there are many construction units along the line. In order to speed up the construction progress and ensure the total construction period, our company divides this project into two construction areas to organize parallel cross-flow construction, and each construction area is equipped with sufficient labor, mechanical equipment and professional teams to systematically carry out cross-flow construction. Based on the principle of underground first, shallow first, deep second, large second, high filling abutment first and common road section, the production meeting of multi-discipline and multi-job parallel cross-flow construction was organized.
Pay full attention to the preparation work before construction, and give the greatest support to this project in terms of organizational system, material objects, machinery and equipment, labor force and working capital.
After entering the site, the original roads shall be widened, reinforced or rebuilt in addition to the treatment of ditches and embankments.
In the process of construction, pay attention to the control and adjustment of the progress of each construction section, and strictly control the start and completion nodes of each subdivisional work. On the premise of ensuring the total construction period, adjust the labor force, mechanical equipment and node progress in each construction area appropriately to meet the needs of the actual situation.
2.2.2 Avoid the influence of rainy season construction.
According to local meteorological data over the years, April to September is the rainy season in this city every year. According to the construction period required by the tender documents, construction problems will be encountered in the early stage of construction. Reasonable arrangement of construction work in rainy season is an important work that determines the progress and quality of the whole project. To this end, we will do the following work to avoid the impact of rainy season construction on project progress and quality:
Do a good job in the drainage of the construction site, keep the drainage ditch unblocked, and designate a special person to be responsible for dredging, so that the rain stops at the construction site and does not affect the normal construction of the surrounding construction units.
In the general layout, give priority to the soil subgrade in low-lying areas, the subgrade in soft soil foundation areas, the soil subgrade in high excavation and deep filling areas and the subgrade with bad engineering geology, and try to avoid the rainy season construction.
In rainy season, soil-based roads will be built, transported with excavation, filled and compacted with paving. According to the permeability of soil, 3% ~ 4% shear wave should be left in each layer and leveled. Loose soil will be filled and compacted before it rains and before work is over to avoid water accumulation. Ensure the engineering quality.
Section 3 Bid Commitment
3. 1 project quality
We will strictly follow the management requirements and standards of ISO-900 1 quality assurance system, carry out quality management of this bid section project, give full play to the advantages of our company's technology and quality management, and make strict and detailed regulations and implementation on the quality assurance system, quality management system in the construction process, quality assurance measures for partial projects, prevention and control of common quality defects and quality management. At the same time, determine the following key nodes of project quality control:
◆ Quality control of measurement and positioning
◆ Quality control of soft soil foundation treatment
◆ Quality control of subgrade filling construction
◆ Quality control of fly ash three slag base course
◆ Quality control of asphalt concrete pavement
Our company will strengthen the quality assurance and control system, raw material quality management and process quality management in the construction process, and strengthen the management and control of the above-mentioned key processes of construction quality control, in strict accordance with the construction technical specifications and standards attached to the bidding documents and relevant technical and quality regulations of Shanghai, so as to ensure that the project reaches excellent standards.
3.2 Project progress
According to the actual situation of this project, our company will invest a lot of labor and construction machinery, and divide this project into two construction sections for simultaneous construction to ensure that this project can be completed on schedule.
3.3 Civilized construction
Ensure that the construction of this project reaches the standard of civilized construction site.
3.4 Epidemic prevention measures
Our company earnestly implements the relevant decisions of the central authorities, and every construction worker must have a health certificate and register. The site is under closed management, and everyone who enters the site must take temperature measurement and do a good job of registration to ensure that no epidemic occurs during the construction of this project.
3.5 Completion data
Our company will set up a full-time data manager in this project to collect, sort out and file the completed data according to the relevant documents of Shanghai Construction Committee, Municipal Archives Bureau, Municipal Bureau and Party A during the construction. When the project meets the completion conditions, the owner shall be provided with a complete completion acceptance report, completion data and completion drawings that meet the requirements of the state and Shanghai Quality Supervision Station within 4 weeks.
Section 4 Scope, Basis and Principles of Bidding Preparation
4. 1 Scope of technical tender preparation
Scope of this tender project: sidewalks, sewers, road base, asphalt concrete pavement, etc.
4.2 Technical standard preparation basis
◆ Bidding documents and relevant design drawings of this project.
◆ Addendum to bid.
◆ Site reconnaissance.
◆ Technical standards and specifications:
Technical standard for highway engineering (JTJ00 1-97)
Code for Highway Route Design (JTJ0 1 1-94)
Code for Design of Highway Subgrade (JTJ0 13-95)
Specifications for design of highway asphalt pavement (JTJ0 14-97)
Code for Design of Highway Cement Concrete Pavement (JTJ0 12-94)
General Code for Design of Highway Bridges and Culverts (JTJ02 1-89)
Code for Design of Highway Masonry and Concrete Bridges and Culverts (JTJ022-85)
Code for construction and acceptance of municipal drainage pipeline engineering (DBJ08-220-96)
Code for Foundation Design (Shanghai Standard (DG J08-11-1999)
Technical Specification for Highway Subgrade Construction (JTJ033-96)
Code for Construction and Acceptance of Asphalt Pavement (GBJ50092-96)
Chapter II Construction Deployment
◆ Overall arrangement of construction deployment
◆ Division of construction sections and overall flow direction
◆ Equipment, personnel and material allocation plan
◆ Construction preparation work
◆ Guarantee measures for construction progress plan
The first section construction deployment overall arrangement
The project line of this bid section is 860 meters long, with large quantities and short construction period. In the process of project construction organization, it is necessary to reasonably divide the construction process and organize the allocation of resources such as labor, machinery and equipment, materials and working capital. At the same time, according to the actual situation of the project and the construction situation in winter and rainy season, the relationship between the preloading period of subgrade fill, foundation treatment and the construction of high fill embankment and low fill embankment of abutment is arranged. Determine the construction scheme suitable for the actual situation on site as soon as possible, organize the construction, and ensure the construction period and quality.
Section 2 Division of Construction Section and General Flow Direction of Construction
2. 1 division of construction section
In order to ensure the overall progress of the project construction, this project is divided into two construction areas according to the location of Wei Yi Road, and cross-flow construction is organized.
2.2 subdivisional work construction process
Construction flow of main processes such as ditch bank treatment, soft soil foundation treatment and embankment construction.
◆ Block diagram of bad foundation treatment construction technology
◆ Block diagram of subgrade earthwork construction technology
◆ Roadbed Filling Process Block Diagram
◆ Block diagram of sewer construction technology
◆ Block diagram of asphalt concrete construction technology
Construction preparation asphalt concrete coordination design
Mixing of base treatment mixture
Asphalt paving mixture transportation
Compaction molding
Section III Equipment, Personnel and Material Allocation Plan
In the process of compiling the technical standard of this project, our company began to investigate the enterprise qualifications and production capacity of all kinds of material suppliers and fly ash suppliers to be selected, and cooperated with the relevant personnel of the above units to conduct on-site inspections to determine the material transportation route and transportation plan; Prepare the material procurement and supply plan to be put into this project.
If our company wins the bid, we can determine all kinds of material suppliers immediately after receiving the bid-winning notice, and sign a material supply agreement with them (including material supply period and entry order requirements); Then you can organize the materials to enter the site in batches according to the material supply plan.
The fourth quarter construction preparation
4. 1 Description of construction site layout
4. 1. 1 construction electricity consumption
4. 1. 1. 1 trunk line layout
The trunk line adopts 75mm2 cable and is arranged along the road. Buried, buried depth of not less than 500 mm.. 50mm thick fine sand is laid on the upper and lower bunks, and a row of standard bricks is laid on it for protection.
4. 1. 1.2 distribution box and secondary trunk line
The secondary trunk line is connected to the fixed motor on site with 50mm2 cable, and a special distribution box is set, and a 1# distribution box is set every 50m along the line.
4. 1. 1.3 Architectural lighting
(1) Two dysprosium lamps are set for lighting in each construction flow section, and φ 48 steel pipes are used for erection, with a height of 12m.
(2) The mobile operation area is illuminated by mobile small solar lamps.
(3) Lighting of living quarters: incandescent lamps with 220V power supply are used in offices, and low-voltage bulbs with 36V low-voltage power supply are used in workers' dormitory areas.
4. 1.2 construction water
4. 1.2. 1 According to the water source guide provided by the owner, the main pipe adopts φ50 galvanized water pipe, the branch pipe adopts φ25 galvanized water pipe, and the water pipe is buried 250 mm.
4. 1.2.2 Water branch pipes are led from each operation area to each water-using place, and special faucets are set, and a faucet is set every 50m along the line.
4. 1.3 Construction of roads and fences
4. 1.3. 1 The materials and personnel of this contract enter the original concrete service road from Moyu Road.
4. 1.3.2 All temporary facilities and material storage yards shall not occupy the construction roads to ensure smooth roads.
4. 1.3.3 The fence shall be erected according to different construction stages, and the fence shall be made of colored steel plates with a height of1.8m.
4. 1.4 site drainage system
Drainage ditches are set on both sides of the road, which are discharged into adjacent rivers after passing through secondary sedimentation tanks respectively. The cross section of the drainage ditch is 400 wide and 500 deep, and the bottom of the ditch is compacted with gravel with a slope of 0.2%. The drainage scheme must be approved by the relevant departments before it can be connected with the adjacent rivers.
4.2 Construction Temporary Facilities Layout and List
Arrangement of temporary facilities
Temporary construction command office, temporary processing shed, guard, etc. Only the facilities of the * * * Tonggou project in Anting Town, which is under construction by our company, are used to build it on site and equipped with necessary facilities.
4.2.2 List of temporary facilities for construction
Serial number facility name area
(m2) Structure type of notes
1 Building Office 60 Plastic Carpet Wallpaper for Mobile Room Floor
Twenty steel containers in the field office will be hoisted by truck cranes at different construction stages.
3 meeting room 40 mobile home floor plastic carpet, wall wallpaper
4 supervision office 20 mobile home floor plastic carpet and wall wallpaper
5. Plastic carpets and wallpaper for the floor of the owner's office and 20 mobile homes.
6 Accommodation Room 300 Mobile Room Cement Mortar Floor
7. Toilet with 20 brick walls, prefabricated roof tiles and wall tiles.
8 bathroom 40 brick walls, prefabricated roof tiles, wall tiles
Septic Tank 10m3 Brick Wall and Prefabricated Roof-
10 gate guard plate 5 movable aluminum shed is hoisted by truck crane according to different construction stages.
1 1 standard curing room laboratory 20 brick-concrete cement mortar floor
12 warehouse 100 brick-concrete cement mortar floor
13 plus shed 100 simple site varies with the construction stage.
And adjust
Note: All the above temporary facilities will be dismantled and evacuated from the site after completion.
The fifth section construction progress plan guarantee measures
This project has long lines, large area and many subdivisional works. In order to ensure that the construction progress meets the time limit stipulated in the contract, we must do a good job in drawing, technical scheme, organization and management, plan adjustment and material supply. Our company has rich experience in schedule management, combined with the actual situation of this project, we are prepared to control the total construction schedule of this bid project from the following aspects:
5. 1 drawing guarantee
Under the concept of total schedule control, our company will designate a special person to actively contact the design unit to agree on the arrival time of the construction drawing and create conditions for the construction.
5.2 Construction technical guarantee
Fully understand the difficulties and characteristics of the project construction, and comprehensively and carefully consider the preparation of construction technical scheme, soft foundation and gully treatment scheme. On this basis, new technologies and new processes are used to shorten the construction period of each construction process and ensure the construction progress with science and technology.
Our company divides the whole project into two construction areas. At the same time, during the construction, sufficient construction technology management strength and mechanical equipment strength shall be provided to ensure the construction period.
Do a good job in winter rain and seasonal construction technical measures, and formulate a targeted winter rainy season construction plan to avoid the impact of winter rainy season construction on the project progress.
A week before the official start of the project, do a good job in the construction organization design, the preparation and audit of the sub-project construction plan, and implement it in the construction process and adjust it in time.
5.3 Prepare a reasonable construction plan
Make all preparations in time, determine the transportation organization plan, schedule plan and labor supply plan, and formulate the mechanical equipment entry and exit plan and material supply plan.
Organize and coordinate the water connection of each construction section of this bid project to ensure the project to be completed on schedule.
Make a reasonable overall construction progress plan and weekly, monthly and ten-day construction progress plans, determine the key nodes of project progress control, and make timely adjustments according to the actual progress in the construction process.
5.4 Construction organization guarantee
After winning the bid, our company will enter the site in the shortest time, get familiar with the project situation as soon as possible, and fully understand various factors affecting the construction period. The project manager department carefully studies and formulates a detailed time schedule plan according to the tender, and coordinates with the subcontracting construction team, including the refinement and optimization of its construction plan.
The project manager holds a meeting of the project management department every week to schedule and balance the construction progress, materials, labor, funds and equipment of this project, solve various contradictions and problems in the construction process, and make this project run smoothly.
The project intends to control the progress of partial projects with weekly plan, hold a balanced dispatch meeting once a week as planned, solve the scheduling problem of labor, construction materials and equipment in time, and ensure that the project is implemented as planned.
During the construction of this project, according to the needs of the project progress, holidays and rest days are cancelled, and the construction method of 2 ~ 3 shifts day and night is adopted to shorten the construction period and equip with sufficient labor force.
Strengthen the construction organization and management, make each division and sub-process overlap reasonably to the maximum extent, and ensure the normal operation of construction flow as planned. The construction of the former procedure creates a good environment for the latter procedure and improves the work efficiency.
Give full play to the advantages of our company's construction organization and management, organize a number of organized ZuoYeDui in the form of general contracting, and the project manager will send management personnel to cross-construct according to working procedures, sub-regions and water sections to monitor the whole process to ensure the realization of the construction period.
Set up a construction coordination team to strengthen coordination with the owner, surrounding units and relevant government departments to ensure the smooth progress of the project construction.
5.5 Implementation and adjustment of schedule
The construction progress plan must be strictly implemented, and the project department will organize a weekly production coordination meeting to summarize the completed work and plan the work for next week. Fully listen to the opinions of all construction units, and at the same time evaluate and comment on the progress of each unit.
Check the progress of the project regularly, and compare whether the actual progress is ahead or behind according to the overall progress plan. If a certain working procedure is found to be behind schedule, effective measures should be taken in time, such as increasing manpower, material resources and machinery, so as to save the delayed construction period.
5.6 Material data and mechanical equipment guarantee
In order to speed up the construction progress, according to the needs of the construction progress, we will organize unconventional investment in equipment and materials, and equip them with enough equipment and materials to ensure the smooth progress of the project construction.
Make full use of the advantages of our company's large-scale mechanical equipment, and allocate, supplement and lease it according to the needs of the project. At present, our company has contacted and reserved a large number of construction machinery, which can meet the requirements of urgent replacement of the project and can be transported to the site at any time, making a strong guarantee for speeding up the project progress.
We will fully plan the supply of materials and mechanical equipment, make full use of the human market resources at this stage, organize a large number of labor, and equip this project with a large number of mechanical equipment to ensure the progress of the project.
According to the divided construction areas, organize flow construction independently. In terms of material supply, according to the construction machinery and material plan required by each construction area, the collection, feedback and adjustment of engineering information should be done in a timely and sufficient manner, and adjustments should be made during the construction process.
5.7 Labor Force Guarantee
According to the scheme implementation requirements, construction progress and labor demand plan, assemble the construction team, organize the labor force to enter the site in batches, and establish the corresponding leadership system and management system.
According to the needs of the project, the qualified subcontractors used by the company are selected as the evaluation targets, and the qualified labor construction team is selected in the form of bidding, giving priority to the labor subcontractors who have obtained excellent projects.
The general contracting department of the project issues the contract performance sheet to the labor subcontractor on a monthly basis, arranges the construction tasks, inspects and supervises the operation quality, safety production and on-site materials of the subcontractor's operation team, provides confirmation materials, and makes a decision to leave the labor subcontractor halfway.
Ensure the distribution of labor force and the arrangement of living security during the Spring Festival and the busy farming season. Fully consider the life logistics required by labor construction personnel to ensure that the construction needs are met.
5.8 Other Warranties
Implement the whole process quality process management, reduce the frequency of general quality accidents, put an end to major quality accidents, and reduce the impact of quality on progress.
Do a good job in site safety, fire control, security and hygiene, do a good job in civilized construction, put an end to major safety accidents and epidemics, and ensure the smooth progress of the project.
Set up an external coordination team, and assign special personnel to do external coordination work in each construction area to reduce the external environmental impact of the project.