catalogue
Chapter I Compilation Basis 2
Chapter II Project Overview 2
Chapter III Purpose and Scope of the Test Section IV
The fourth chapter construction personnel, mechanical equipment and measuring test equipment investment 5
Chapter V Subgrade Test Section 8 Construction Preparation
Chapter VI Filling Construction Method 10
Chapter VII Test Results 17
Chapter 8 Construction Progress Plan 18
Chapter 9 Quality Assurance Measures 19
Chapter 10 Safety Assurance Measures 19
Chapter 20 XI Environmental Protection Measures
Chapter I Compilation Basis
1. 1, the Ministry of Railways promulgated the Interim Provisions on the Design of New Passenger and Freight Lines with a Speed of 200 km/h;
1.2, Technical Requirements for Roadbed Design of Speed-up Section of zhejiang-jiangxi railway Electrification Project (first draft) by the Second Survey and Design Institute of the Ministry of Railways;
1.3, Code for Construction of Railway Subgrade promulgated by the Ministry of Railways (TB10202-2002);
1.4, Code for Design of Railway Subgrade promulgated by the Ministry of Railways (TB10001-99+0-99);
1.5, the Ministry of Railways promulgated the Geotechnical Test Method for Railway Engineering (TBJ102-96);
1.6, construction drawing design of zhejiang-jiangxi railway reconstruction speed-up project;
1.7. Notice of relevant documents of the construction unit, design unit and supervision unit.
Chapter II Project Overview
2. 1 Overview of zhejiang-jiangxi railway Electrification Speed-up Reconstruction Project (Zhejiang Section) The relevant units in the eighth contract section are as follows: Construction unit: Zhejiang-Jiangxi Electrification Speed-up Reconstruction Project Construction Headquarters of Shanghai Railway Bureau; Design unit: Supervision unit of the Second Survey and Design Institute of the Ministry of Railways; Construction supervision technology company of Shanghai Railway Institute: China Railway Fourth Engineering Group Co., Ltd. The mileage of this contract is K 14 100 ~ K6543. 8+074+000, with a total length of 33km. There are 4 stations in the pipeline section. After reconstruction, 3 stations will be kept and 1 station will be closed. There are * * * 15 double-line bypass sections in this bid section, all of which are new lines. The standard of the reconstructed subgrade is high (the opening speed reaches 200km/h) and the curve radius is large, which meets the requirements of line speed increase. The main projects of speed-up reconstruction include: subgrade widening, new subgrade of bypass section, new bridge culvert and reconstruction, new track laying, turnout, line displacement and some related supporting projects such as station building, signal, communication and electric power. After the line is opened and the subgrade is stabilized, it is arranged to replace the jointless track before the completion of this bid section. The subgrade earthwork in this bid section is 6,543,8+550,000m3, of which 690,000m3 is filled and 960,000m3 is excavated.
Main technical standards
Railway grade: Grade I.
Number of main lines: double lines
Restricted slope: 7.2‰
Minimum curve radius: 3500m for newly-built section. Difficult sections are 2800 meters, and individual sections are 2200 meters.
Traction type: electric power
Effective length of arrival and departure line: 850 meters
2.2, the setting of the test section
According to the comprehensive analysis and comparison of the current construction drawing in place, land acquisition and demolition, earth borrowing site, site traffic, water and electricity, the test section is set at K163+230 ~ K163+430, with a total length of 200m m. The original landform of this section is cash crop areas such as vineyards and strawberry fields, and there are no culverts, passages and other structures in the filling range, which is suitable for filling construction. Geological conditions: This bid section is basically located in Jinqu Basin, and the geological soil layer is as follows from top to bottom:
① Planting soil and muddy clay with a layer thickness of 0.1~ 0.5m;
② Clay, yellow brown, gray, hard plastic, layer thickness1.2 ~ 3.0m.
③ Silty sand, yellowish brown, medium dense, saturated, mixed with thin clay; Layer thickness1.5 ~ 3.5m.
④ Clay, bluish gray, soft and hard and plastic, with groundwater depth of 0.5 ~ 2m. The geological and surface conditions of this section of subgrade can represent the characteristics of subgrade filling construction in this area. The basic conditions of subgrade design in this bid section are: subgrade top width 12. 1m, horizontal curve radius of 3500m, longitudinal slope of 6.0‰, and average filling height of 3.5m The main design quantities are embankment filling of 995m3, subgrade filling of 5,268m3, replacement of permeable materials of 3,750m3, soft soil excavation of 3,750m3, and total filling.
Chapter III Test Purpose and Scope of Test Section
3. 1 purpose of the test section
(1) Determine the economic and reasonable fillers in this area, select the compaction machines and tools that meet the construction requirements, the fillers used, the reasonable loose laying thickness under compaction conditions, the compaction times and the optimal water content control in construction, and select the economic, reasonable and accurate detection means.
(2) Verify the Interim Provisions on the Design of Newly Built Passenger-freight Co-line Railway with a Speed of 200 kilometers per hour promulgated by the Ministry of Railways, and accumulate construction experience and field test data for future railway construction.
3.2 Test scope ①. Construction technology of subgrade bed bottom filling (including detection means) (below subgrade bed 1.9m);
(2) Construction technology of embankment filling under subgrade bed (including detection means);
③ Subgrade base settlement observation and subgrade surface settlement observation.
Chapter IV Input of Construction Personnel, Mechanical Equipment and Measuring and Testing Instruments and Equipment.
4. 1 Construction personnel enter the site
(1) Management, technology, quality inspection and testing personnel are all in place. See the personnel list and related materials.
Table 1: Table of Main Construction Personnel
Table 1
Serial number, name, education level, professional title and working time.
1 Liu Bo Senior Engineer Commander 199 1.7
2 Jia Benzheng, deputy commander and senior engineer, 1993.7
3 Zhang Weidong Senior Engineer and Chief Engineer 199 1.7
4 Ying Kezhong, Undergraduate Engineer, Minister of Engineering Department (Chief Engineer) 1997.7
5 Gao Yu Undergraduate Engineer Quality Inspection Engineer 1998.7
6 Director of Laboratory of Assistant Engineer of Ningxia National Technical Secondary School 1988.7
7 Gao Qi assistant engineer survey supervisor 200 1.7
8 Fan Junxian Specialist Technician Surveyor 2002.8
9 Surveyor of Ancient Rongcheng Senior High School 1997.6
10 song middle school surveyor 1987.438+00
1 1 Huang falian, assistant engineer, technical director, July 2000
12 Technician of Five-Star College Technician in August 2002
13 Yang, monitor of junior middle school workers 1985.7
(2) The production workers participated in the construction of the experimental section, including the monitor Yang He 14 and five mechanical and automobile drivers.
Everything is ready.
4.2 Mechanical equipment put into construction in the experimental section The subgrade filling in the experimental section mainly adopts excavators to excavate earthwork, dump trucks to transport earthwork, and bulldozers to cooperate.
Preliminary leveling, vibration roller rolling, grader finishing filling surface. See Table 2 for the required mechanical equipment.
Construction machinery table put into test section
Table 2
Serial Number Equipment Name Specification Model Unit Quantity Status Remarks
PC-200 1 excavators are in good condition.
2 Vibrating roller YZ 18D is in good condition.
Ty 235, 173kW bulldozer and 1 bulldozer are in good condition.
4 Dump truck CXZ 18JHL, 12T vehicle 2 is in good condition.
5 Graders PY 180a, 138kW, 1 are in good condition.
6 sprinkler CA 10B, 8000L 1 intact.
4.3 Equipment of measuring and testing instruments (see Table 3) List of measuring and testing instruments and equipment
Table 3
No. Equipment Name Specification Model Unit Quantity Verification Status Remarks
Swiss Leica TC702 1 total station is qualified.
Grade 2 1002 factory DS3E 1 qualified
3.3m wooden ruler with spirit level is qualified 1.
4 level 5m aluminum alloy ruler handle 1 qualified.
5K30 leveling instrument Yb-1 300mm sets1qualified.
6. The daily output of MC-3 nuclear density hygrometer is 1.
7 dynamic penetrometer N63.5 sets 1 are all qualified.
Sand filling bucket Ф150 mm1qualified.
The case size AGT- 10 sets 1 sets are all qualified.
The fifth chapter subgrade test section construction preparation
5. 1 investigation work
According to the nail pile data of design institute, carry out construction survey, restore the middle pile position of the line, encrypt the leveling point, measure the cross section of subgrade, and release the red line pile for land acquisition.
5.2 Drainage ditch excavation
Dig a drainage ditch along the property line, and drain it in situ with a depth of 80cm. Dig symmetrical collecting wells on both sides of subgrade every 100m to pump out the accumulated water.
5.3 substrate treatment
According to the geological data and the light dynamic in-situ test results of the basement (according to the design documents, the bearing capacity of soft soil foundation is σ 0 < 150kPa), the subgrade of this test section needs to be treated before filling. According to the design documents and the actual situation on site, it is necessary to dig out the planting soil and muddy clay with a thickness of 50cm below the original ground, and then replace them with appropriate fillers.
5.4 Packaging Selection and Indoor Test
After detailed investigation, the users of this bid section are mainly sandy clay, which belongs to Class B filler, and meet the requirements of relevant codes and standards such as Interim Provisions on Design of Newly-built 200-kilometer-per-hour Passenger and Freight Co-line Railway and Code for Construction of Railway Subgrade. (selecting group A and B fillers or improved soil as the bottom filler of the bed; According to the earthwork allocation plan, the soil source in the test section is planned to carry out subgrade excavation in section K162+820 ~ K163+040. After filling soil sampling, particle screening, soil liquid, plastic limit, free expansion rate and standard compaction test are carried out to determine the soil category and related indicators, so as to guide on-site construction. According to the sampling test, the soil source is group B filler.
(For details, please refer to the geotechnical test reports numbered T2004-02-00 1 and T2004-02-002).
5.5 Selection of spoil ground
Because the foundation treatment needs to dig out a lot of planting soil and muddy soil which are not suitable for subgrade filling, it is necessary to choose a suitable place as a spoil ground. Based on the principle of environmental protection, economy and rationality, after many field investigations, no suitable spoil ground was found within the radius of 10km in this test section. Only a pond abandoned for many years on the upstream bank of Xinzhongxi Bridge at K 149+848 is suitable for requisition, with a reserve of about 5000m3 and a transportation distance of13.5km..
5.6 Rolling before filling
After the foundation treatment is completed, the following parts of subgrade bed shall be filled. When the water content is appropriate, the base should be dried and rolled before filling to achieve the specified degree of compaction. The filling height of this section is all greater than 1.5m, and the rolling requirement before filling reaches 82% of the heavy compaction test.
5.7 Cross-sectional survey
After the compaction work before filling is completed and reaches the specified degree of compaction, the section of the original ground is measured to determine the filling quantity, which will be used as the basis for future measurement and payment. After the cross section is checked and signed by the supervision engineer, the toe line and center line of subgrade slope can be laid out.
Chapter VI Filling Construction Methods
The construction contents of this test section include basement replacement, embankment filling and subgrade bottom filling. The process is shown in figure 1.
6. 1 packaging source and excavation method
The soil in this section comes from the hillside excavation where the K162+820 ~ K163+040 line passes, and the excavation section carries out topsoil cleaning, root excavation and unsuitable material cleaning. The central laboratory has carried out soil sampling test, and the test results show that the soil meets the filling requirements, and all kinds of test records and reports of soil samples from soil sources are complete. ). According to the earthwork allocation plan, the earthwork excavation in the test section is reversed from K 162+960 to K 163+040. The existing tractor-ploughed road at K162+020 ~ K164+800 is used for the construction access road, and the existing pavement is repaired with gravel soil. On-site construction adopts self-provided 75kW generator, and construction water is taken from the river on the right side of the line.
6.2 process overview
6.2. 1 The basement is excavated by excavator, transported to the spoil ground by dump truck and leveled by bulldozer. Greening of spoil ground.
Subgrade filling
Excavators are used for digging and loading, and dump trucks are used for transportation. According to the lofting width and loose laying thickness, control the discharging amount and check the water content. When the water content is suitable, it will be spread and leveled by bulldozer. After the loose spread thickness and flatness meet the requirements, it will be rolled by roller according to the regulations. According to the previous construction experience, the compaction degree is generally checked after rolling for three times, and then the compaction degree is checked every time the rolling is increased, until the required compaction degree standard is reached.
6.3 Unloading control
Before filling, set out the middle pile and filling sideline, and nail out the sideline pile every 10m. In order to ensure the compactness of subgrade edge, the sideline should be 30cm wider than each side of the design line. According to the volume and loose laying thickness of each dump truck, the number of dump trucks per 10 linear meter is calculated to control the loose laying thickness.
6.4 Burying settlement piles
After the compaction test of the excavated basement is qualified, the settlement observation piles will be buried on the line every 20m, and the embedding positions are K 163+240, K 163+260, K 163+280, K 163+300 and k/respectively.
The settlement observation pile consists of settlement bottom plate, measuring rod, casing, casing joint, casing cover plate and measuring rod head. The settlement plate is made of reinforced concrete, with the size of 500mm×500mm×30mm, and prefabricated with C 15 concrete. The measuring rod is made of 40mm steel pipe, one end of which is the outside line and the other end is the inside line, each of which is 50cm long, and the casing is made of plastic pipe.
Working principle: The buried settlement layer sinks with the foundation settlement, and its elevation is measured through the transmission of the measuring rod connected with it. The height of measuring rod minus the length of rod is the elevation of settlement plate, and each settlement difference is the surface settlement value.
6.5 Paving and leveling
In this test section, the same filler is used to replace the permeable soil at the bottom of the base, embankment and foundation bed. First, check the water content of the filler. When the difference between the water content of the filler and its optimum water content is less than 2%, paving and leveling shall be carried out immediately. In this test section, the loose laying thickness is 30cm, 40cm and 50cm respectively.
Spreading the filler with bulldozer to ensure the smoothness and thickness uniformity of each layer of filler. In the process of leveling, keep digging holes with a shovel and check the loose laying thickness. In principle, 2% ~ 4% herringbone transverse slope must be formed for each layer of filling, and it can be gradually formed at the bottom of the foundation bed when it is difficult.
The joint between the upper and lower layers of two adjacent sections shall be staggered by a distance of not less than 3m. The subgrade around the settlement observation pile 1m is filled and leveled manually.
6.6 rolling
After paving and leveling, the loose paving thickness, flatness and water content meet the requirements, and then rolling is started. Two 18T vibratory rollers (exciting force is 36T) are used in this test section. The two rollers are bounded by the center line, and each roller presses the width of subgrade by half radial, and records its rolling times and rolling speed respectively.
When rolling, the order from both sides to the center is adopted, and the longitudinal rolling is carried out before and after, with overlapping wheel tracks in rows.
0.2 ~ 0.3 cm, horizontal joint overlap 0.4~0.5m, and adjacent two sections of longitudinal overlap 1.0~ 1.5m, so as to ensure no pressure leakage and dead angle, and ensure the uniformity of rolling.
The rolling method is as follows: static rolling once, weak vibration rolling once, strong vibration rolling twice to six times (synchronous detection results are determined), weak vibration rolling once, and finally static rolling again to eliminate wheel tracks. Namely: static pressure weak vibration strong vibration weak vibration static pressure. The rolling speed should be slow at the beginning (2-3km/h), and the maximum speed should not exceed 4 km/h.
6.7 Compaction detection
After each layer of filler is rolled for three times, the K30 flat-plate load meter and nuclear density meter are used to detect the foundation coefficient K30 and porosity N. At the same time of testing with nuclear density hygrometer, parallel contrast tests are carried out by sand filling method (or irrigation method) to verify the testing data of nuclear density hygrometer, and the testing frequency is 18 points per layer (after rolling for three times) until the compaction degree reaches 90%.
During the test, technicians and inspectors are arranged to record the rolling speed, rolling sequence, rolling times and compaction degree of the roller, so as to sort out the summary report guiding the large-area subgrade filling construction.
After the compaction degree of the first layer in the test section reaches 90%, the compaction tests with 93% and 95% compaction degrees are carried out after being checked and approved by the supervision engineer, so as to determine the corresponding rolling times and the best construction organization when the compactors with different tonnage reach 90%, 93% and 95% compaction degrees, and select the appropriate water content and appropriate loose laying thickness.
Chapter VII Test Results
1. Collate and analyze the test data of different filling thicknesses and different rolling times, draw the curve of rolling times and K30 value and porosity n value, and determine the rolling times of different filling thicknesses in Haicheng.
2. Make technical and economic analysis and comparison on reasonable rolling times with different filling thicknesses, and determine the best.
Filling thickness and rolling times.
3. According to the settlement observation results, calculate and sort out the observation data, draw the relationship diagram between filling date and settlement, and evaluate whether the post-construction settlement can meet the design requirements.
4. Summarize the above construction records and test data, write the test report and submit it to the supervision station and the owner's representative for examination and approval.
Chapter VIII Construction Progress
See table 1 for details.
Construction schedule 1
Serial number Work or homework content March and April
Morning, noon and night, morning, noon and night.
1 foundation in-situ test for 3 days
2 matrix treatment for 8 days
3. Bury settlement pile 1 day
4 Filling and compaction
Site inspection 2 1 day
5 Foundation in-situ test for 3 days
Chapter IX Quality Assurance Measures
1, establish the idea of "quality first", implement ISO9000 series standards, and strengthen the control and record of construction process.
2, strengthen the professional and technical training of construction personnel, improve the post responsibility system, by skilled and experienced workers engaged in complex technology, difficulty, high precision process or operation.
3, according to the different process characteristics and technical requirements, choose the mechanical equipment that meets the construction requirements, improve the mechanical management system, and ensure that the mechanical equipment is in the best use state.
4. Displacement technicians should often go deep into the site to check the operation quality of the construction site, and on-site technicians should track the whole construction process.
Chapter X Safety Assurance Measures
1, in line with the principle of "safety first, prevention first", improve safety awareness, improve the emergency plan for accidental injuries on the construction site, seriously study the post full responsibility and safety operation procedures, improve professional level and labor skills, and establish the idea of nip in the bud in safe production and scale operation.
2, to ensure the safe use of machinery and equipment, machinery and equipment operators must follow the operating procedures of the equipment, machinery operators and motor vehicle drivers must have the corresponding special type of work certificate, it is strictly prohibited to work without a license, it is strictly prohibited to mechanical equipment in spite of illness and illegal operation.
Chapter II XI Environmental Protection Measures
1. In dry season, during earthwork transportation and filling construction, water source shall be provided to sprinkle water on the construction access road and subgrade operation area to reduce dust. In the process of earthwork transportation, when crossing the local drainage (concrete) pavement, transport vehicles must drive at a speed limit; The stains crushed by vehicles and the earth and stone scattered on the road surface by vehicles should be removed in time.
2. After the excavation of the borrow pit is completed, it should be restored as a family farm. If it cannot be restored, it should be leveled, and an outward drainage slope should be provided, and turf and trees should be planted on it for greening to prevent soil erosion.
3. The site selection of the spoil ground must be cautious, and the impact on farmland, water conservancy, rivers and traffic should be comprehensively considered. The closure of the spoil ground should be properly handled, such as leveling and greening.