1, the preparation basis
1.1, Shanghai Hanzhong Railway Hefei to Wuhan section WHZQ-1 standard project construction tender.
1.2, engineering design drawings provided by the bidding unit.
1.3, the current railroad engineering design specifications, construction specifications, acceptance standards and other valid documents.
1.4, the opening of the construction unit before the opening of the construction unit to organize a site visit to investigate the information.
1.5, our company is engaged in similar projects in the construction experience, technical summary, and work method and other scientific and technological achievements, the existing comprehensive construction capacity, machinery and equipment.
1.6, Beijing ISO9000 standard quality system certification center validated by the ISO9001 standard "quality manual" and "program documents.
1.7, DK312+650～DK312+700 section test pile process and site technical parameters: before test pile, firstly, pile machine calibration should be carried out, and test pile can be made only after passing. At the beginning of the test pile, start the recording and air feeding valves, and start drilling with 5 gears, current 30-40A; when the depth reaches 2.5m, the current reaches 75A, that is to say, it enters into the hard layer, and then change the 3 gears to drilling 50㎝, and the current reaches 80A; when it reaches to the bottom of the pile, turn off the air feeding valves, and then turn on the feeding valves, and then start the powder spraying and lifting, and lift the powder at the speed of 3 gears. The lifting speed is 3 speeds. Stop spraying powder until it is 50cm from the ground, and then lower the drilling and re-stirring, and continue lifting and re-stirring after re-stirring for 2mins in the original position at the bottom of the pile. Until the end of the whole pile. The construction technology adopted was "one spraying and three stirring". The result of the test pile meets the design requirements, and the obtained parameters are shown in the attached table.
2. Scope of preparation
The soft soil roadbed within the range of DK300+370～DK316+000 of WHZQ-1 standard of Hefei-Wuhan section of Shanghai-Hangzhou-Rongzhou corridor of new railroad is designed to be the construction section of powder spraying pile reinforcement.
3, project overview
3.1, Shanghai Hanzhong Passage Hefei to Wuhan section of the two-line railroad, railroad grade: Ⅰ; limitation of gradient: 6 ‰; passenger train design speed: 200Km / h, reserved for 250Km / h and above; the minimum curve radius: 4500m; the spacing of the front line: 4.6m; type of traction: electric power; the quality of traction: 4000t; the effective starting line to the line. 4000t; effective length of arrival and departure line: 850m; blocking mode: automatic blocking; building limit: reserved for double-decker containers.
3.2, the construction mileage of my project team is DK300+640～DK300+840; DK301+130～DK301+200; DK301+640～DK301+800; DK311+410～DK311+490; DK312+650～DK312+700; DK312+780～DK312+700; DK312+780～DK312+700. DK312+750～DK312+700; DK312+750～DK312+700; DK312+780～DK312+890 with total length of 670 m. The foundation of this section is soft ground, which can't satisfy the requirements of the railroad roadbed in terms of settlement and stability, so it adopts the powder spraying piles to reinforce foundation. The specific engineering profile of each section is as follows:
3.2.1, DK300+640 ~ DK300+840, section of the valley between the hills, the surface layer of powdery clay, soft ~ flow plastic. Designed with powder spraying piles to reinforce the foundation, pile length 1.0m ~ 6.0m, spacing 1.0m, square arrangement, the diameter of the pile is 50cm, the total length of the pile is 34782m, 6780 piles.
3.2.2, DK301+130～DK301+200 section is a valley between hills, the surface layer is powdery clay, soft～fluid plastic. Designed with powder spraying piles to reinforce the foundation, pile length 2.0m ~ 2.5m, spacing 1.0m, square arrangement, the diameter of the pile is 50cm, the total length of the pile is 4972m, 2110 piles.
3.2.3, DK301+640～DK301+800 section is a valley between hills, the surface layer is powdery clay, soft～fluid plastic. Designed with powder spraying piles to reinforce the foundation, pile length 2.37m ~ 3.73m, spacing 1.0m, square arrangement, the diameter of the pile is 50cm, the total length of the pile is 12866m, 3880 piles.
3.2.4, DK311+410～DK311+490 section is a valley between the hills, and the surface layer is silty powdery clay, flow plastic. Designed with powder spraying piles to reinforce the foundation, pile length 4.09m ~ 5.56m, spacing 1.0m, square arrangement, the diameter of the pile is 50cm, the total length of the pile is 21,822m, 4,232 piles.
3.2.5, DK312+650～DK312+700, DK312+780～DK312+890 section is a valley between the hills, powdery clay, soft～fluid plastic. Designed with powder spraying piles to reinforce the foundation, pile length 1.06m～6.67m, spacing 1.0m, square arrangement, pile diameter 50cm, pile length 26792m, 5660 piles.
3.3, major works quantity table
Pile No.
Unit
Quantity
Pile length
DK300+640～DK300+840
Extension meters/root
34782/6780
1.0-6.0
DK301+130～DK301+200
Extension meter/root
4972/2110
2.0-2.5
DK301+640～DK301+800
Extension meter/root
12866/3880
2.37- 3.73
DK311+410～DK311+490
Extended meters/root
21822/4232
4.09-5.56
DK312+650～DK312+700
DK312+780～DK312+890
Extension meter/root26792/5660
1.06-6.67
3.4, main technical parameter index
Wet slurry piles are used when the water content of the stratum is <30%, >70% or PH value is <4, and powder sprayed mixing piles are used when the ground doesn't conform to this condition. Our department does water content test on soil samples of mixing pile construction site of the whole section, and its water content is between 30% and 35%, therefore, it adopts powder spraying pile construction, and all of them adopt P032.5 grade ordinary silicate cement. The amount of dust spraying of powder spraying pile should be not less than 55Kg per meter. 28 days later, the specimen was taken to do unconfined compressive strength test, the strength of the pile body was not less than the design value (1700Kpa), and the bearing capacity of the composite foundation Ra was not less than 115KPa 28 days after the pile was formed.
4、Construction Overall Program
4.1、Construction Organization
We will set up a team to work on the soft ground treatment project. Land foundation treatment engineering team, and send excellent staff responsible for the construction of the project. The details of construction organization are shown in the Block Diagram of Organization.
Block diagram of organization structure
4.2 Construction electricity
Construction electricity is provided by two 75Kw generator sets.
4.3 Construction water
Local surface water is abundant, rivers and streams are more, after the health inspection, the water quality can be used as construction mixing water, so the construction water can be solved by taking water nearby.
4.4, construction test
According to the plane control network and guide line points, the total station or latitude and longitude instrument is used to place the center point of the pile to determine the position of each pile. Elevation measurement is carried out with level meter, original ground elevation is placed at each pile position, and the length of drilling rod is utilized to determine the elevation of pile bottom and top to ensure that the pile length meets the design requirements.
4.5 Internal data
Arranging special management in accordance with WHC's relevant documents on internal data organization and ISO9001 standard Quality Manual and Procedure Documents, the internal data are true.
5, the main labor force and construction machinery and equipment configuration
5.1, labor force configuration
According to the distribution of the volume of work, combined with the overall construction progress plan, the project plan for the average number of people required to construct the project per day is 93 people, divided into three shifts of operation, the labor force required for each type of work *** see the following table:
Labor force plan schedule
The p>No.
Shift
Quantity (person)
Work content
1
Transportation shift
6
Cement transportation
2
Drilling shift
12
Drilling and powder spraying pile construction
3
Electrical and Mechanical Workshop
4
Welding, Electrical and Mechanical Maintenance, Construction Electricity Guarantee
4
Materials Team
2
Purchase of Materials and Equipments
5
Surveying Team
3
Laying Piles and Laying Lines
6
Management Personnel
4
Total
31
5.2 Configuration of construction machinery and equipment
No.
Equipment name
Quantity
1
Drilling rig
2
2
Air compressor
2
3
Ash delivery tank
2 sets
4
75KW diesel generator set
2 sets
5
Cable, wire
Some
6
Repair equipment
2 sets
7
Powder Spraying Recorder
2 sets
5.3, Material Supply Plan
Mileage
Material Name Cement (Ton)
Batch
Split Batch Quantity
DK300+640～DK300+840
2017.4
5
400
DK301+130～DK301+200
288.4
2
200
DK301+640～DK301+800
746.2
4
200
DK311+ 410～DK311+490
1265.7
3
400
DK312+650～DK312+700
DK312+780～DK312+890
1553.9
4
400
6. Construction Process of Powder Spraying PileThe basic construction process of powder spraying pile is as follows: firstly, confirm the position of the main body of powder spraying machine and the perpendicularity of the mixing shaft, and then rotate the mixing shaft while drilling to the depth of reinforcement. At this time, no reinforcing material is sprayed, but in order not to block the nozzle, compressed air should be continuously sprayed, and after drilling to the predetermined reinforcing depth, reinforcing material is sprayed while lifting.
Construction steps are as follows:
1. Before the construction of powder spraying pile, level the site, and then put the equipment in position, and check whether the equipment is running normally.
2. Pile construction: the drilling rig first positively rotates and drills close to the ground, then starts the air compressor and continues drilling to the designed hole depth. The design hole depth of each pile is determined according to the data given in the drawing (strictly controlled). During the drilling process, ensure that the verticality of the drilling rig is within the design requirements.
3. After drilling to the design hole depth, close the air supply valve, open the feed valve to spray the reinforcing powder (powder spray amount shall not be less than 55kg/m), at this time, the drilling rig stagnation in the design depth of 2min, the drilling rig reversed drilling, and maintain a certain rate of uniformity to enhance the mixing bit, the side of the powder spraying side of the mixing, while lifting the side of the pressure density. Stop spraying powder after lifting it to 20-50cm from the ground, open the air feeding valve, close the feeding valve, and rotate it in the original position at the top of the pile for 2 minutes to make sure that the top of the pile is compacted uniformly.
4. Re-stirring: after the powder spraying machine lifts up the dust to 0.3~0.5m from the designed top surface elevation, turn off the dust pump, at this time, the cement in the aggregate hopper is just emptied, in order to make the soft soil and cement mix evenly, sink the mixer to the designed depth again, then lift up the deep mixer out of the ground;
5. At last, lift the drill to stop the compressor at 0.50m from the ground, and shut down the drilling machine at 0.15m from the ground. 0.15m stop.
6. The construction of powder spraying pile adopts one-time spraying and stirring to form a pile, if the spraying stops in the middle for some reasons, repeat the spraying and stirring for 1.0m when the spraying is renewed.
7. In the process of construction, record the construction process in detail and check the quality of construction at any time.
8. Repeat the above steps for the next pile construction.
7. Planned start and completion dates
7.1. The powder spray mixing pile of section DK312+650～DK312+700 and DK312+780～DK312+890 is planned to be started on January 15, 2006.
7.2. The overall completion date of March 21, 2006 is planned.
7.3 Progress of works
The progress of each section is based on the land acquisition, pipeline demolition and relocation and other preliminary preparations for specific sections.
Section DK300+640～DK300+840 is scheduled for 50 days;
Section DK301+130～DK301+200 is scheduled for 15 days;
Section DK301+640～DK301+800 is scheduled for 30 days;
Section DK311+410～DK311+490 is scheduled for 30 days;
Section DK311+410～DK311+490 is scheduled for 30 days. 490 section is planned to last 30 days;
DK312+650～DK312+700 and DK312+780～DK312+890 sections are planned to last 40 days;
8. Quality Assurance Measures
8.1. Quality Objectives
8.1.1. Ensure that all the works meet the current national and Ministry of Railways' Project quality acceptance standards.
8.1.2, the project once acceptance rate of 100%.
8.2 Quality Assurance Measures
8.2.1 Construction machinery, electrical equipment, instrumentation equipment and machineries, etc., will be allowed to be used only after confirming their integrity.
8.2.2, the material has a quality certificate; do not use moisture caking, deterioration of the reinforcement material, and rain waterproof facilities;
8.2.3, drilling rig in place to check the verticality of its drilling rods, and there are devices showing the verticality of the rods and the depth of the drilling rods drilling. The verticality of the drilling rig is controlled within 1.0%. The verticality check of the drill pipe adopts the method of checking the verticality by hanging the vertical ball on the drill pipe to measure the height and the corresponding deviation;
8.2.4 The powder spraying machine is equipped with the electronic measuring device, and the measuring device will not be put into use without the measuring device, and the measuring device must be calibrated first and then be used;
8.2.5 The key of the quality of powder spraying piles lies in the control of the quantity of spraying dust, and the quantity of spraying dust should be controlled strictly according to the construction of not less than 55 kg/m. During the construction, it should be controlled strictly according to the quantity of spraying ash not less than 55 kg/m.
8.2.6, the pile length, pile diameter and re-stirring length should also be controlled in the construction, which are also the key factors to control the quality of the pile;
8.2.7, when the pile is stopped in the process of construction, the second spraying overlap and connect the pile, and the connecting pile length is not less than 1m, and the phenomenon of stopping the drilling should not be appeared as far as possible in the construction.
8.2.8, the speed and frequency of mixer spraying and lifting must be in accordance with the requirements of construction technology, and there should be a person to record the time of mixer sinking and lifting per meter. The error of depth recording shall not be more than 100mm; the error of time recording shall not be more than 5s.
8.2.19 Strengthen the cooperation with the construction, supervision and design units, take the initiative to listen to the supervisory engineers, and implement the safety and quality supervision of the supervisory engineers.
9, construction progress plan and schedule guarantee measures
9.1, construction progress plan
According to the site, schedule and construction of electricity and the amount of work and other factors, the first into the 2 sets of mixers, and the corresponding generator set, etc., and then according to the construction progress, and then make adjustments. Ensure that the work is completed within the specified construction period.
9.2, schedule guarantee measures
According to the specific construction conditions and environment of this project, in order to speed up the progress of the project, to ensure that the task is completed on schedule, our company will organize a skilled team to enter the construction site, so as to ensure that the construction period is completed as scheduled, and at the same time, the development of the following measures to ensure that:
9.2.1, to strengthen the management of the personnel of the construction site. Fully mobilize the enthusiasm of the front-line construction personnel, so that the responsibility to the person, the progress of the person, the quality of the person, equipped with sufficient professional and technical personnel and skilled trades, to avoid the impact of personnel factors to the progress.
9.2.2, the regular organization of the company has construction experience in technical management personnel to the scene to help solve construction problems, the construction of special key parts and technical problems in advance of the seminar, so that a variety of technical problems in advance to solve them, so as not to affect the construction progress.
9.2.3, according to the amount of work and the total construction period, combined with the actual site, to grasp the construction elements needed to optimize the construction period control of each division of the project, so that the project according to the development of the total construction period as scheduled.
9.2.4, strengthen the coordination work, the establishment of a strong logistical support timely supply of materials needed in the construction phase, to ensure uninterrupted construction.
9.2.5, grasp the construction of key parts of the construction, on which to put enough equipment, personnel, to ensure that the construction is carried out according to plan.
9.2.6 Strengthen the organization and leadership, formulate detailed operation plan, establish the work schedule job responsibility system, ensure the realization of the construction organization plan, so that the progress of the project is maintained at a stable and balanced production level, to achieve the predetermined overall goal.
9.2.7, the construction site set up safety and quality of full-time inspectors, strengthen the site safety and quality supervision, to avoid the impact of construction due to safety, quality and other issues.
9.2.8 Carry out the labor competition of "ensuring safety, quality and schedule" to improve labor efficiency and speed up the construction progress.
10, safety measures
Safety is the guarantee of production, safety is the necessary aspects of the implementation of technical measures, only safe to ensure the success of production, technology, economy, so in the process of construction must be set up in the "safety first" point of view, often talk about safety, and often pay attention to safety, and improve safety. Production.
10.1, because the machinery is mainly electricity-based, so we must pay attention to the safety of electricity, power into the line installed power distribution and leakage protector, construction should be responsible for the electrician;
10.2, machinery operators must be familiar with the operating procedures and operating procedures;
10.3, the operator must focus on following the instructions, can not leave their posts without authorization, and when problems are found to make contact.
10.4, when the drilling rig is moved into position, the step should be flat, the drill bit should be at least 15cm from the ground, when there is a pit on the ground, it should be filled with sleepers and so on and then walk to ensure the safety of walking;
10.5, because hopper tanks, air compressors and so on are pressure vessels, the operators must clearly understand the pressure vessel operating procedures. Operating procedures. To prevent high pressure caused by the danger.
10.6, mechanical failure, first cut off the power supply, shut down the air compressor, open the bleeder valve, release the cement in the pipe, to confirm that there is no electricity and no air pressure, before dealing with the failure;
10.7, prohibited high-speed rotation and operation of the gear, can not be drilled should be lifted in a timely manner, to prevent overloading of drilling caused by damage to the equipment;
10.8, when the drilling When drilling is jammed, drilling should be stopped, and the drill pipe should be lifted first and the slow-speed gear should be used to try drilling, and the drilling should be stopped in time if drilling is still not possible.
10.9, off-duty should be the drilling rig parked on a solid and level ground or padded sleeper stacks, cut off the power supply, put away the active cable, temporary wires, locking the electric box, storage to prevent accidents;
10.10, into the construction site must wear a helmet, the construction site should be set up to construct the police line.
10.11, the rainy season to do a good job of construction precautions and a variety of temporary facilities to prevent drainage work, to keep the drainage ditches open. Do a good job of flood prevention, the construction personnel equipped with the necessary labor protection supplies, ready to flood rescue materials, to the local meteorological department for years of weather information and keep abreast of the construction year and the construction period of the weather forecast, early arrangements, so as to be prepared for any problems.
10.12, the construction site at night with adequate lighting equipment, night construction at low temperatures, to ensure that the cold, can not be in the site of random fire heating. Night construction to strengthen the shift system.
11, environmental protection, water protection, cultural relics protection and civilized construction measures
11.1, the establishment of environmental protection, water protection, cultural relics protection management system, the development of detailed environmental protection, water protection, cultural relics protection and civilized construction program;
11.2, respect for the local folklore, the establishment of good relations between workers and peasants;
11.3, the establishment of a special responsible for Water, electricity, land mu and coordination of local relations personnel;
11.4, the construction of waste materials, wastewater treatment, slurry sewage should be precipitation treatment to meet the appropriate discharge standards before discharged into the receiving pollutant; strictly prohibit petroleum pollutants directly discharged into the receiving water body;
11.5, strict control of construction noise pollution to the local community, the neighborhood has a noise environmental sensitive points of its noise emission standards should be satisfied with the noise emission standards;
11.5, strict control of construction noise pollution. Sensitive points and their noise emission standards should meet the "Urban Regional Environmental Noise Standards";
11.6, production and living garbage should be classified and collected in a unified manner, sealed packaging and then transported to the designated location of the landfill disposal;
11.7, study and education, implementation of the "Protection of Cultural Relics Law", in the construction of cultural relics or archaeological and geological research value of the items found, immediately stop work! Seal the site, while sending specialized personnel to protect the site, send someone to quickly notify the construction unit and the local cultural relics department. After the cultural relics department to deal with, and then construction, to ensure that the motherland cultural heritage is not infringed upon, is strictly prohibited on the discovery of cultural relics private possession or illegal resale.
11.8, the site is always neat and orderly, civilized construction, finished materials, to protect local water resources and buildings, to avoid damage.