In view of the outstanding characteristics of the construction interference of this project and the requirements of the overall construction progress, and according to the traffic conditions of the existing roads on site and the specific conditions of other sites, it is preliminarily proposed to adopt the construction scheme of synchronous construction of the right picture.

1, construction scheme

1) Because this project is an old sidewalk reconstruction project, it will not affect the smooth traffic, so it is proposed to adopt the construction scheme of simultaneous construction on both sides.

2) Firstly, according to the pavement structure, select the appropriate machinery to carry out the demolition construction, so as to obtain the empirical parameters, and provide reliable empirical parameters, templates and basis for guiding the construction of the whole line in the next step.

2, the construction method

1) Method of removing old sidewalk pavement

After the construction survey and lofting, the construction work of removing the sidewalk pavement can be carried out, including the removal of the old pavement, the cleaning, transportation and treatment of debris and garbage within the scope of removal, and the compaction of the original subgrade. Create conditions for construction. Cleaning up the site can be done with the help of excavators and manpower. Considering that there are many underground pipelines under the old sidewalk, it is planned to use a small excavator with manpower to dismantle the concrete pavement of the old sidewalk, and the old sidewalk on the brick road section will be manually demolished before being excavated. The cleaned waste shall be transported to the designated place in time. After digging to the design elevation, it shall be compacted according to the design requirements.

2) Treatment methods of underground pipelines

There are many underground pipelines under the old sidewalk. In the process of excavation, the size and direction should be found out manually first, and then the excavation should be carefully carried out manually or by small machinery. When encountering pipelines that hinder the construction, report to the supervisor, the owner and the design representative in time, and then carry out the construction after the problem is solved.

3) Leveling

After the surface of the old sidewalk is demolished, earthwork excavation shall be carried out by manual cooperation with small machinery. After reaching the design elevation of 5cm, excavation shall be carried out by manual lifting. During leveling, a certain rolling height is reserved according to the soil quality to ensure that the elevation after rolling meets the design requirements. When the water content is close to the optimal water content after leveling, the rolling operation can be carried out. When rolling, it should be light before heavy, slow before fast, edge before middle.

(II) Construction method of structural surface course

1 graded macadam cushion construction

First, prepare qualified graded macadam, stew it before construction to make its water content reach the best water content, then transport it to the construction site by car, level it with a small excavator first, then level it manually, and control the elevation with hanging lines at the same time. Usually pay attention to the reserved loose laying thickness. After leveling, it shall be compacted with a smooth roller of 18T or above. After acceptance, medium sand cushion should be laid as soon as possible.

2, medium sand cushion construction

Choose high-quality medium sand and spread it evenly. Similarly, use small machinery to pave manually, and reserve a certain loose paving thickness. Only after passing the supervision and inspection can water-permeable bricks be laid.

3, color permeable brick construction method

During construction, pay-off shall be carried out on the completed medium sand cushion, paving shall be carried out one by one according to the design requirements, and the brick joints shall be straight with a rubber hammer. Finally, use fine sand or dry mortar to sweep the joints and clean the brick surface. When the shop is stuck, it should be tamped with a rubber hammer to the elevation of the design surface. After checking that there is no empty drum, clean the ceramic tile. Before the combination is firm, people should be prevented from trampling or colliding to ensure the quality of pavement engineering.

3.C20 concrete pavement kerb and C 15 concrete enclosure construction method.

C20 concrete kerbs and C 15 concrete kerbs should be laid before the construction of graded macadam cushion. When the sidewalk is excavated to the design elevation, the kerb and the foundation groove of the concrete retaining structure shall be excavated at the same time. After the excavation according to the design size is completed, it will be tamped manually, and then the graded macadam cushion with a thickness of 10cm will be constructed at the bottom of the foundation trench. After completion, C20 concrete kerbs and C 15 concrete will be laid.

When paving, attention should be paid to the vibrating compaction of C 15 concrete on the front and back of kerbs and concrete coamings to ensure their firm installation without looseness. When the shop is stuck, the line should be hung to correct the position, so as to ensure that the lines are straight, the arc is smooth and the edges and corners are neat.

(3) Key points of structural plane construction

The total thickness of sidewalk structure is 20cm, including 10cm graded macadam cushion, 4cm medium coarse sand cushion and 6cm thick colored permeable brick surface.

1) inspection: the color permeable brick of sidewalk adopts the shape and size specified in the design. Check whether the size is qualified before paving (the allowable error of two diagonal lines is 3 mm, the allowable error of thickness is 3 mm, the allowable error of side length is 3 mm, and the length of missing edges and corners is not more than 5mm). Smooth surface, clear lines, neat edges and corners, and no honeycomb, exposed stones and peeling cracks on the surface.

2) Check the grid coordinates: determine the grid coordinates according to the control points and hang up the line, then lay them in sections (laying formwork strips), and check the position and elevation at any time. Determine the laying position of blind road (60 cm wide) and the joint between blind road and intersection according to relevant specifications, lower the surface layer to make a ramp of 1000× 1000, and set kerbs on both sides of the ramp.

3) When laying bricks, handle them with care and tamp them with a rubber hammer or wooden hammer (nail rubber) to avoid damaging the corners of bricks.

4) Vertical and horizontal joints: ensure smoothness, avoid uneven bending, and the joint width meets the design requirements.

5) After laying bricks, check the flatness. If there is displacement warping and inequality with adjacent slabs, it shall be corrected immediately. Finally, fill the brick joints with dry sand mixed with110 cement, and sprinkle water on the brick surface to make the lime-sand mixture sink until the lime-sand is filled, so as to keep the brick surface clean.

6) Maintenance: water spraying for 5-7 days, mainly for wet joints, and loading is not allowed during the maintenance period.

Six, the construction progress and time limit for a project guarantee measures

The purpose of schedule control is to achieve the total construction period as the goal, take the key process control as the main line, take the flow plan as the chain, ensure the cohesion, stability and balance of the plan, and effectively control the whole process of the plan through information feedback and the management mode of "three-level network and four-level plan" to ensure the realization of the construction period goal. In order to meet the requirements of the total construction period of this project, we must first control the beginning and end of each stage.

Seven, high temperature season construction measures

In view of the characteristics of high temperature and long time in summer, the project department will focus on safety production and heatstroke prevention and cooling, ensure the quality and duration of the project, ensure the safety and health of employees, prevent all kinds of accidents and ensure the orderly construction in summer.

1, set up a leading group for summer work, with the project manager as the team leader and the director of the office and the quality and safety department as the deputy team leader, responsible for the management of the construction site and the lives of employees, effectively improve the environmental sanitation of canteens, dormitories, offices and toilets, spray drugs regularly to prevent mosquitoes and flies, and put an end to the prevalence of common diseases. Care about the safety and health of employees, especially those in front-line high-temperature posts, and smooth the supply of tea and cool drinks. Careful supervision and inspection, so that the responsibility lies with people, and take effective measures to protect the health of employees.

2. Do a good job in electricity management. Summer is the peak period of electricity consumption. We will regularly check and maintain the electrical equipment one by one. It is forbidden to connect and pull wires indiscriminately, especially to check the wires in the dormitory in time and strengthen the education of electricity consumption knowledge. Do a good job in resistance testing of various lightning protection devices to prevent electric shock and lightning accidents.

3. Strengthen the management of storage, transportation and use of inflammable and explosive dangerous goods, and take sun protection and cooling measures for dangerous goods piled in the open air. It is forbidden to be exposed to the hot sun, avoid leakage and put an end to all spontaneous combustion, fire and explosion accidents.

4. During the period of high temperature, according to the needs of production and workers' health, arrange production shifts and work and rest time reasonably. For those who work in special environment (such as open air and closed environment), take measures such as shading and ventilation or adjust working hours to prevent employees from heatstroke, suffocation and poisoning. In case of heatstroke, suffocation, poisoning and other accidents, immediately carry out emergency rescue or loose hospital emergency rescue.

5. Pay attention to the following points in summer project construction:

1) outdoor overhead lines, oil storage tanks, etc. Special devices such as anchors and stay wires should be used to prevent storms, and regular safety inspections should be conducted.

2) Shading or special management should be adopted for special materials to prevent material deterioration.

Eight, technical measures to ensure quality

quality assurance （control） system

The quality of the project is directly related to people's life and property safety and the service life of the project.

Quality is the most basic requirement for the construction of this bureau. The project department will establish an all-round quality assurance system with ideological system, control system and organization system as the core and quality information feedback as the mainstream according to the document standards. As our management policy, we take the owner satisfaction rate as 100% as the quality target.

(2) Formulate the quality responsibilities of the personnel of the project department.

Project manager, technical director, builder, quality engineer, surveyor, material engineer, tester, data and other positions are set up in the project management department, among which the team quality engineer is the team leader, and the project manager is responsible for the formulation of quality policies and objectives. Clarify the control points and quality objectives of key projects and special processes. Clarify the quality responsibility and prescribed authority, and implement it to people. The quality responsibility of each manager shall be implemented according to the quality responsibility system of the bureau.

(3) Establish a quality reward and punishment contract

1, the company signed a quality award and punishment contract with the project department, linked the project quality with the economic benefits of the project department, and adopted measures of heavy rewards and heavy penalties to improve the enthusiasm of all employees in the project department to create excellence. Similarly, the project department implements the system of linking the quality of sub-projects with the economic income of the project manager and team, and assesses the quality of sub-projects according to the work quality and process quality of each task list of the team, and rewards and punishments are given according to the quality assessment level; Make the income of team members closely linked to the quality of the project, and resolutely dismiss the team that fails to meet the requirements of quality evaluation grade. The management personnel of the quality supervision, inspection and control department of the project department can fully exercise their quality veto power, so that the management personnel of the project department can effectively command and organize the construction of the team.

2, implement the task list signing system, the monthly task list completed by the team shall be issued by the builder, and then the full-time quality engineer of the project department shall determine the scope of rewards and punishments according to the contract requirements, verify the quality level of the sub-projects and make settlement.

(4) Organization and management measures:

1, the company set up a strong construction leading group, as the core of construction leadership, and regularly participated in various trainings organized by the bureau to improve their own business level, so that the project department managers can fully guarantee their own work quality and organizationally ensure the realization of the goal of creating excellence in the quality of this project.

2. Hold regular on-site coordination meetings. Establish a weekly project meeting system, coordinate the work between different types of work, solve the problems existing in the construction in time, and prevent the occurrence of quality hidden dangers.

3. The quality controller shall timely evaluate the quality of the divisional project and do a good job in the inspection of the divisional project.

4. The operator is responsible for the inspection of all materials and the production of test blocks, and send them to the test site approved by the supervision engineer in time.

5, all kinds of raw materials inspection must be based on the contract documents and the corresponding standards and supervision engineer's requirements.

6, do a good job of periodic appraisal and sampling inspection of measuring equipment used in the construction of this project.

7. On-site measuring instruments must be kept by special personnel (this project is kept by project technicians and project operators * * *, and used by special personnel), and a use account is established, and others are not allowed to use it at will.

8. All measuring instruments should be inspected and appraised regularly. Damaged measuring instruments must be repaired and replaced in time, and it is not allowed to work in spite of illness.

9, process handover quality inspection, that is, the important process of this project, on the basis of self-inspection and mutual inspection, full-time quality engineer for process handover inspection.

10, quality inspection and acceptance of concealed works. All concealed works should be inspected and accepted before they can be concealed.

1 1, the finished product protection inspection has been completed, that is, whether the finished product has protective measures or whether the protective measures are reliable.