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I. Overview of the Engineering Department:

The geological conditions along the line are as follows: (1) The surface layer is 0.4~3.7m artificial fill layer; (2) There are newly deposited layers (low liquid limit clay and silt, high liquid limit clay, fine soil sand and silt) under the artificial fill layer, which has high compressibility and soft soil characteristics; (3) The following are Quaternary sediments with medium-high compressibility. The buried depth of groundwater level along the line is generally 0.5~2.0m

2. General situation of retaining wall engineering

There are 7 retaining walls in this project. Retaining walls are in the form of assembled reinforced concrete retaining walls and masonry retaining walls, with a total of six assembled retaining walls, numbered 1#, 2#, 3#, 4#, 5# and 7 #. 1 masonry retaining wallNo. is 6#.

3, engineering characteristics

This section of the project is mainly connected with the designed closed frame or abutment. The wall panels are all in the form of rectangular structure, and they are stepped after being integrally connected. The top of the wall is made into a slope according to the design elevation, and 0-25 cm concrete is poured on the precast retaining wall, which is connected with the cast-in-place ground floor and anti-collision guardrail. The crash barrier is covered and decorated with hanging plates.

In the design, the size of foundation and the thickness of foundation treatment are related to the bearing capacity of foundation, and the foundation treatment adopts lime-fly ash stabilized macadam. If the bearing capacity of the foundation below the foundation treatment layer cannot meet the design requirements, other treatment methods such as soil replacement will be adopted to meet the design requirements.

Second, the project component construction scheme

(a), the construction organization:

1, construction deployment:

1) The professional construction team under the project department is responsible for the specific construction of this sub-project.

Annex II: Layout of Construction Site

2) Temporary power consumption: According to the engineering characteristics and power consumption forecast, it is planned to configure three transformers (10 kV, 1 3 15 KVA, 1 250 KVA, 1 200 KVA). Two temporary transformers are set in some areas to supply power to the construction site and support and protect the temporary wires.

3) Temporary water use: It is planned to use the local tap water in Sunjiapo Village to meet the domestic water demand, and the construction site will be equipped with two water trucks to supply water to the construction site.

4) Temporary land use: steel equipment warehouse shall be set up at the west branch station of Chemical Engineering Bridge.

(2), construction method

1, construction preparation

1) Preparation before construction

First of all, the traverse and leveling points are retested, and these measurement data are sorted out and sent to the supervision engineer for verification.

Before retaining wall construction, determine the center line and establish temporary leveling points. Before digging the bottom and pouring concrete foundation, the elevation of the center line of retaining wall and embedded parts should be corrected in time.

2) Mechanical preparation

According to the existing allowable construction area, it is planned to invest 20 main personnel, including excavators 1 set, 6 road rollers, sprinklers 1 set, cranes 1 set and loaders 1 set.

Annex III: Preparation List of Mechanical Equipment

5) Preparation for construction survey:

(1) measurement control principle

Carefully retest the measurement data provided by the owner. If any error beyond the allowable range is found in the retest, retest again until it is correct. Use the control points and data provided by the owner to control and properly encrypt the existing pavement. In the construction area without control points, a new survey control network is built. The principle of survey control points is the same as that of encryption points, which should meet the design requirements.

(2) Control point detection and cross-sectional review

Before construction, retest the plane and elevation control points. Use total station to detect traverse points, cooperate with automatic level and double-sided ruler to measure, and report the test results to the supervision engineer for approval in time.

(3) Construction survey of retaining wall

Surveyors should strictly control the plane position and longitudinal elevation of retaining wall according to the center line and elevation point of road and bridge construction.

6) Personnel preparation:

Annex IV: List of staff

2, precast buttress retaining wall construction method

Annex V: Construction Process Flow Chart

(1) Before slotting and trenching, the position of the existing pipeline shall be investigated in detail, and the geophysicist shall determine the pipeline elevation and dig the pit on site, and clearly mark the existing pipeline. When slotting, the pipeline must be excavated manually. If an unknown pipeline is encountered during construction, it shall be properly protected in time and the relevant departments shall be notified for handling.

According to the soil conditions, when the excavation depth is less than 4.0m, the excavation slope is1:0.5; When the excavation depth is greater than 4.0m, the excavation slope is1:0.75; When digging a ditch, the bottom must be cleared manually when the elevation is 20 cm away from the bottom of the ditch. It is forbidden to overbreak and disturb the undisturbed soil at the bottom of the ditch.

(2) Basic treatment

In the design, the size of foundation and the thickness of foundation treatment are related to the bearing capacity of foundation, and the material of foundation treatment is lime-fly ash stabilized macadam. If the bearing capacity of the foundation below the foundation treatment layer cannot meet the design requirements, other treatment measures such as soil replacement should be taken to meet the design requirements. The treatment below the foundation treatment layer needs to be confirmed by the design, supervision and Party A, and then the treatment opinions are given.

(3) Forming of foundation reinforcement of retaining wall

(1) The steel surface shall be clean and free of rust, grease, paint and other dirt;

(2) the steel bar must be straightened, and the surface of the straightened steel bar can not have scars that reduce the cross section of the steel bar;

(3) After the steel bar is bent, there should be no crack, scale or fracture on the surface;

(4) the variety, grade, specification, diameter and various sizes of steel bars meet the design requirements through sampling inspection;

⑤ When binding and molding, there shall be no rust and oil stain before welding; There shall be no bite, crack and slag inclusion at the weld, and the welding layer shall be knocked off.

⑥ The mesh or skeleton formed by binding or welding must be stable, and the reinforcement at the cup groove shall not be loose or deformed when pouring concrete.

(4) pouring retaining wall foundation concrete

(1) The concrete mixture ratio must meet the design strength requirements.

(2) The concrete shall be compacted by vibrating, and the position of cup and groove shall be strengthened by fine vibration to prevent reinforcement leakage and honeycomb dog holes.

(3) The embedded parts shall be welded with the foundation reinforcement according to the design position, so as to avoid deformation and displacement when vibrating concrete.

(5) Installation of retaining wall slab

(1) Before installation, the retaining wall plate must meet the design requirements, and the appearance is free of stare blankly, corners and cracks before installation.

(2) The surveyors play the control line, and use theodolite or elastic board to control the verticality of the wallboard surface. After the pier wallboard is in place, immediately weld the embedded parts of wallboard and foundation, and seal the triangular ash at the same time.

(3) The concrete between the wallboard must be vibrated and compacted, and the splints on both sides shall be fastened, and no slurry shall be leaked, and the mortar will pollute the wall.

(4) The plate joints are marked with protoplasm, which is dense, flat and beautiful.

(6) pouring triangular concrete on the top of the wall

(1) The surveyors strictly control the elevation of the formwork according to the designed elevation of the longitudinal section.

(2) The inner side of the formwork shall be thinned with plastic strips, and it is forbidden to run slurry;

(3) Before pouring, chisel and brush cement slurry at the top of the wall to facilitate the top-down combination of concrete.

3, slurry block stone retaining wall construction method

(1) The surveyors shall pay out in strict accordance with the drawings.

(2) The trench is excavated manually, the bottom is treated with foundation, and the cast-in-place concrete foundation is supported by wooden formwork.

(3) The wall masonry shall be built in sections, and the position shall be set at the deformation joint of foundation according to the drawing, and the elevation difference of adjacent masonry shall not exceed1.2m..

The connecting plate should be installed accurately and firmly, and the material of the connecting plate should meet the design requirements.

(4) The continuous masonry height of the wall should not exceed 1.2m every day. When the height difference between adjacent retaining walls is large, high wall sections should be built first. When laying, the slab joints shall not be displaced or deformed.

⑤ When the height of retaining wall is more than 50cm, set drainage holes, which are 25cm away from the ground and 3-5m apart, and use PVC pipes with a diameter of 3 cm; Gravel with a diameter of 2-5cm is accumulated in an arc shape of 30cm inside the drainage hole, and the gravel is wrapped with permeable geotextile.

⑥ Settlement joints are set for the retaining wall at intervals of 10- 15m, with joint width of 1cm, and filled with linoleum or wooden boards. The filled side of settlement joints is provided with emulsified asphalt and linoleum waterproof layer with a width of 20 mm..

⑦ Leave 1-2cm on the exposed surface of retaining wall for jointing, and cement mortar shall be applied at the joint of block and gouge.

⑧ The decorative block of retaining wall is connected with the common block with special clips, so that it becomes a whole.

4. Retaining wall ancillary works

① Settlement joint

The length of retaining wall foundation section shall not be greater than 16m. Settlement joints should be left in staggered or segmented positions of foundations. Foundation settlement joint should be painted with 2-3 layers of emulsified asphalt or 2 layers of linoleum, and a waterproof layer of three oils and two felts should be set on the filling side wall.

② Drainage hole

Drainage holes are arranged between the two wall panels with a distance of 2m. The drainage pipe is made of 30mm galvanized steel pipe, with leakage at the outside of wallboard 10mm, leakage at the inside of the wall of 20mm and cross slope of 3%. The inlet of the orifice is made of gravel with a diameter of 2.5-7 cm, and the gravel diameter is not less than 50 mm.

5. Allowable deviation of retaining wall inspection:

Allowable deviation table of cast-in-place retaining wall foundation:

Frequency of checking allowable deviation of serial number items (mm)

1 the compressive strength of concrete must comply with the provisions of GBJ 107-87.

2. The section size is 10 and the height is 20m.

Width 10

Cup mouth width +20 0

The axial displacement of the three cup grooves is10.20m..

The bottom elevation of four cups is +5- 10 20m.

5. Honeycomb pits shall not exceed 1% 20m of the template contact surface.

Allowable deviation table for retaining wall installation:

Allowable deviation of inspection frequency points of serial number items (mm)

1 Top elevation 5 20m 1

2 wall verticality 0.5% h is not more than 15 20m 1.

3 straightness 10 20m 1

4 Staggered platform between plates 5 20m 1

Allowable deviation of slurry block stone retaining wall:

Allowable deviation of inspection items (mm)

1 plane position 50

2 Top edge flatness 30

3 verticality or slope 0.5% h

4 Top surface elevation plus or minus 20

5 section size is not less than the design value.

Third, the engineering division quality assurance measures

1, quality target

1) The overall quality goal of this project is to ensure the city-level project and strive for national Excellence.

2) The qualified rate of process, division and unit engineering quality is 100%.

3) The project quality has reached the qualified level.

2. Quality assurance system:

(1) Seriously implement the quality policy and objectives, do the basic work of quality management, ensure the effective operation of the quality system, and establish the post responsibility system for project manager, chief engineer, quality engineer, safety officer, builder, technician, material engineer and operator.

⑵ The project department shall formulate the activity plan of creating excellence according to the quality objectives, and the responsibility shall be carried out to the people. Carry out the activities of creating excellence purposefully and in a planned way, and at the same time formulate reward and punishment measures to arouse the enthusiasm of personnel at all levels and achieve quality objectives.

(3) The system of holding relevant certificates shall be implemented in the construction, and the project manager, chief engineer, quality control personnel, measuring and testing personnel and construction operators shall all hold relevant certificates.

(4) The project department shall set up a laboratory with temporary qualification to be responsible for engineering test and inspection. Re-examine important axes and leveling points, and re-examine all kinds of incoming materials.

3. Technical guarantee

(1) Strictly implement construction specifications and quality evaluation standards, implement quality target management, and decompose quality targets into posts and individuals.

(2) Strictly implement the system of blue prints.the design and technical disclosure, and the construction personnel shall strictly follow the effective drawings, design documents, technical disclosure and relevant specifications, standards and operating procedures. Conscientiously implement the system of hidden inspection and pre-inspection, strengthen the implementation of the "three inspections" system, and the working procedure that is not inspected according to the regulations is not allowed to be transferred to the next working procedure.

(3) Resolutely implement the incoming goods verification and inspection system, so that unqualified materials are not allowed to enter the site and are not allowed to be used. Ensure the accuracy of various measuring, testing, metering and other instruments to meet the needs of construction and production.

⑷ Measurement: Traverse control measurement and leveling control measurement, the specified instruments and equipment shall be used in strict accordance with the specification requirements, and the measurement results must be within the specification error range. If it exceeds the specification, it must be re-measured. When handing over piles on site, there should be a pile delivery record, the content must be complete and signed; Before the actual measurement, do a good job of joint measurement with the control points of adjacent blocks to ensure the interconnection of measurement control points; The original data must be marked with date, tester and inspector; All measurement results must be checked by special personnel before they can be used to guide construction; All measuring instruments must meet the standard accuracy and be within the annual inspection cycle; Effectively protect all datum points and other related signs until the project is completed and accepted.

4. Quality assurance measures

All projects must be operated and constructed in strict accordance with the design documents and technical specifications for highway engineering construction, so as to prevent all quality accidents. Mainly from the following aspects to control:

Technical disclosure should be responsible at different levels, with different emphases and detailed disclosure records. Technical personnel at all levels should strive to be complete, thorough and thorough.

Review of design documents. Mainly review whether the elevation, size, quantity and mileage of each pier are correct and whether there are any mistakes or omissions.

The survey work should be serious and responsible, strictly control the elevation of each horizon, be meticulous and accurate, and strictly implement the survey review system.

Establish a sound quality assurance system. The chief quality inspection engineer, quality inspection engineer, survey team, laboratory, construction team and engineering department strictly control the project and strictly implement the "three inspections" system of project quality.

Fully implement quality management standards, enhance employees' quality awareness and improve project quality.

Main technical guarantee measures:

Do a good job of measurement according to the design, and make a detailed technical disclosure on the site operation. Need to ensure the construction progress.

Improve the quality of technical work, conscientiously implement the review system, control the quality of the project, and put an end to rework.

Formulate the implementation of construction organization design, adopt network control system, timely and reasonably allocate labor and mechanical equipment to organize construction production, maximize the ability of personnel and machinery, improve work efficiency, shorten the construction period of individual projects and speed up the progress.

Annex VI: Block Diagram of Quality Assurance System

Iv. Environmental protection measures for civilized and safe construction.

1, environmental protection measures for civilized construction

1) Work objective: All site management is up to standard; The discharge of noise, solid waste, dust and sewage on the construction site meets the standard requirements, and there is no serious pollution disturbing the people (no complaints, no media exposure and punishment); Cover or solidify the flying objects piled on site; Maximize the saving of hydropower energy.

Implementation standard of environmental protection for civilized construction:

Strictly implement the health and environmental protection standards of Beijing construction site and the requirements of relevant laws and regulations of China and Beijing. Always regard environmental protection of civilized construction as one of the main work contents, strengthen on-site management and do a good job in environmental protection of civilized construction.

2) Civilized construction measures

(1) In order to comprehensively strengthen the management of the construction site, improve the level of civilized construction and comprehensive management, establish a good corporate image of Beijing Road and Bridge, do a good job in the publicity of civilized construction and environmental protection, and create a good construction atmosphere. Under the leadership of the leading group for civilized and safe construction of the project department, combined with the characteristics and actual situation of the project, the division of responsibilities is clearly defined, and the rules and regulations of the project management office, the director's office and the project department on civilized construction and environmental protection are seriously implemented.

(2) Before construction, conduct civilized behavior education for operators to improve their awareness of civilized construction.

(3) In the process of construction, keep good relations with the local government and residents, and create a civilized construction window.

(4) The planning and layout of the construction site is reasonable and beautiful, so that the site is clean, the roads are smooth, the drainage is smooth and the signs are eye-catching.

(5) The enclosure operation shall be carried out in the construction area, and the enclosure on site shall be firm, tight, beautiful and clean.

(6) Do a good job in close cooperation between each working procedure to reduce disharmony and contradiction.

(7) Save hydropower energy to the maximum extent, and put an end to the phenomenon of ever-burning lamps with flowing water on the construction site.

(8) On-site operators shall be neatly dressed, and on-site management personnel shall wear badges. It is forbidden to wear slippers with bare backs. Non-operating personnel are strictly prohibited from entering the construction site.

(9) Engineering materials and product components are classified and neatly stacked; Machinery and equipment shall be parked in an orderly manner, keep normal operation, and the machine capacity shall be neat.

(10) Take good care of cultural relics, stop construction when underground cultural relics are found, protect the site and report in time.

(1 1) Strengthen the inspection and supervision on the construction site, make it strict and lasting, and make the site civilized construction management really effective.

(12) Strengthen the management of office materials. In engineering construction, all kinds of data should be classified reasonably and completely, with correct handwriting, detailed content and complete procedures.

3) Environmental protection measures

(1) Do a good job in site environmental protection to reduce the impact on the surrounding environment.

(2) Before the operation, organize environmental protection publicity and education for the operators, unify their thinking, and improve the environmental awareness of all the operators.

(3) Clear division of responsibilities, and earnestly implement various rules and regulations of environmental protection.

(4) Temporary roads should be used for construction vehicles entering and leaving the site to avoid walking at will and damaging existing trees. The construction area is fenced off from the trees to avoid damaging the trees.

(5) Dust and solid waste control measures

(1) Designated persons shall clean the enclosure and construction area of the construction site to keep the site and its surroundings clean and tidy.

(2) The construction entrance and exit shall be specially assigned to clean the construction vehicles to prevent the existence of sediment.

(3) Site materials shall be stored in a centralized way, and measures such as covering or curing shall be taken to avoid dust flying.

(4) The construction waste shall be cleaned up and transported in time, and closed transport vehicles shall be adopted to prevent the road surface from being polluted by omission along the way.

⑤ Set up special personnel to listen to the weather forecast, keep abreast of the weather changes, and stop the garbage removal operation in case of weather above the fourth-grade wind.

(6) Noise control measures

(1) According to the actual situation, it is close to Sunjiapo residential area, which is the key area for noise control of this project.

(2) Strengthen the management of high-noise equipment such as loaders and dump trucks on site, select low-noise equipment, monitor in time, arrange operation time reasonably, and take noise reduction and noise elimination measures such as sealing for special equipment to control construction noise emission to the maximum extent and prevent noise pollution from disturbing people.

(3) Strengthen the management of workers, and it is forbidden to talk loudly during construction to avoid man-made noise pollution disturbing people.

(4) In accordance with the requirements of the night construction permit, effective noise reduction measures shall be taken before the construction operation to prevent disturbing people. For example, inform the surrounding residents of the construction time in advance to gain their understanding; Strengthen the education of operators, and it is forbidden to talk loudly at night, and take it lightly; Construction vehicles are forbidden to whistle, etc.

(7) Sewage and oil pollution control measures

Do a good job in regular maintenance of on-site machinery and equipment, regularly check the operation of equipment and facilities, repair oil leakage in time, and prevent oil pollution from polluting the land.

2, safety assurance measures

1) Work objective

(1) No death, serious injury or mechanical injury accident;

(2) The frequency of minor injuries is less than 3 ‰;

(3) No major traffic accidents above Party A will occur;

(4) The safety education and training rate is100%;

(5) The certified rate of workers with special types of work100%;

(6) The mechanical and electrical equipment (including hand-held power tools) has a pass rate of 100%.

2) Implementing standards

Strictly implement Beijing construction site safety protection and fire protection standards and the requirements of relevant laws and regulations of the state and Beijing. Adhere to the policy of "safety first, prevention first", conscientiously implement the safety production rules and regulations of this project, strengthen on-site safety management and do a good job in safety production.

3) Organization guarantee

(1) Establish the leading organization for on-site production safety: under the leadership of the leading group for civilized and safe construction of this project, establish the leading group for the construction site of the branch company. The work area manager is the team leader, who is fully responsible for the safety production of this project.

(2) Full-time security officers shall be set at the site, which shall be increased according to the construction progress.

(3) Each team leader is a part-time safety officer of this team, who is fully responsible for the health and safety of the workers in this team.

(4) The Project Safety Department is responsible for guiding, supervising and inspecting the safety management of this project.

4) System guarantee

(1) safety education

(1) Before the construction, the Project Safety Department shall organize all operators to receive entrance safety education and training, and they can only take up their posts after passing the examination.

② Strictly implement the pre-class education system. Before every day's homework, the team leader should make a pre-shift speech, explain the work content and safety precautions of the day, and make records.

(2) Safety technical disclosure

(1) Before the project starts, according to the overall disclosure requirements of the project chief engineer or technical director, the technical director of this project shall make a written disclosure to the foreman, labor service captain or team leader.

(2) The foreman, labor service captain or team leader shall make oral disclosure to all construction workers on the basis of written disclosure. After the disclosure is completed, all personnel who accept the disclosure must sign the disclosure book. The original signature should be submitted to the security department for investigation.

(3) Safety technical disclosure must be detailed, comprehensive and targeted. When it is necessary to draw a schematic diagram, the disclosure person shall draw it according to the specifications and the actual situation on site.

(4) Safety technical disclosure must be carried out before there are two or more people working and multi-process crossover operation.

(3) Acceptance of mechanical equipment

(1) All mechanical equipment entering the construction site must be inspected for technical performance, safety performance, environmental protection performance and operator certificates, and can only be put into use after being confirmed to be qualified. It is strictly prohibited to use without inspection or unqualified inspection.

(2) Temporary lines, electrical equipment and facilities shall not be put into use until they are installed and accepted.

(4) On-site full-time safety management personnel and special types of work must hold relevant certificates.

(3) Assign full-time security officers to inspect the site regularly, correct violations in time, and handle and report potential safety hazards in time.

(4) When using and operating construction machines and tools, strictly implement the safety operation procedures of this type of work and this machine. Machinery and equipment shall be maintained by designated personnel, and shall not be operated in spite of illness, overload or illegal operation.

(5) In the process of earthmoving vehicles entering and leaving the site, designated persons shall be assigned to command and coordinate the vehicles.

(6) According to regulations, all workers wear safety helmets.

(7) Strictly implement the operation procedures during the operation, so as not to command or operate illegally.

(8) Set up full-time electricians to strengthen the safety management of temporary electricity consumption. When connecting and disconnecting the power supply, it must be operated by a full-time electrician, and it is strictly forbidden for unlicensed personnel to connect and disconnect privately.

(9) On-site electricity utilization shall strictly comply with the requirements of Technical Specification for Safety of Temporary Electricity Utilization on Construction Sites (JGJ46-2005).

(10) The site is equipped with patrol factory guards on duty to ensure that no theft occurs.

(1 1) During construction at night, the work site must have sufficient lighting.

(12) Strengthen the supervision and inspection of the construction site, and the on-site safety personnel patrol and inspect every day, and handle any hidden dangers in time.

6) Emergency handling

(1) power failure accident treatment

(1) In order to ensure the normal power supply to the construction site and reduce various adverse effects caused by power failure, the construction site is equipped with 200KW generators 1 set. In case of power failure, the generator will be started immediately to provide temporary power.

(2) Assign a special person to be responsible for the daily management and maintenance of the generator.

③ Strengthen the inspection and maintenance of power lines to ensure the safe and normal transmission of power lines.

(2) Sudden fire treatment

In case of fire, immediately organize manpower to put out the fire and call the police in time.

(3) Other emergencies shall be implemented according to the construction site emergency plan.

7) Other control measures

(1) Actively get in touch with local government, public security, environmental protection and transportation departments, and strive for guidance, support and supervision from all levels of departments.

② Do a good job in logistics support, strengthen food hygiene management and prevent food poisoning.