Construction Organization Design

1. Project Overview

1) This project is the sidewalk and greening on the north side of XXX Middle Road (Tianma Bridge-Fuxing Road) in Liuyang City Works, including road greening (except street trees), sidewalk paving, and curb installation. Construction period requirement: 40 calendar days.

2. Preparation Instructions

First of all, thank you very much for the bidding opportunity provided by your owner. We at Changsha Jiufeng Construction Engineering Co., Ltd. have a sincere and responsible attitude towards the owner and a perfect attitude towards the project. In pursuit of this, after careful on-site investigation, bid review and other work, this construction organization design was compiled based on the actual project. The purpose of this construction organization design is to start from the overall construction situation and provide a relatively complete programmatic document for the bidding stage based on various specific construction conditions. Once the bid is won, it will be deepened on this basis to guide project construction and management. .

3. Main Basis

The construction organization design is mainly compiled based on the following information and documents:

1. XXX Middle Road, Liuyang City (Tianma Bridge-Fuxing Road) north side sidewalk and greening project bidding documents;

2. Liuyang City XXX Middle Road (Tianma Bridge-Fuxing Road) north side sidewalk, greening project design drawings and related design documents;

3. "Code for Construction and Acceptance of Urban Greening Projects";

4. "Plant Materials for Urban Greening and Garden Green Spaces";

5. "Construction Project Quality Management Regulations";

6. "Landscaping Technical Regulations (Trial)"

7. "Landscaping Management and Maintenance Specifications"

8. Other relevant construction, acceptance specifications and Standard;

IV. Construction Organization Plan and Deployment

Section 1 Deployment Principles

1. Concentrate efforts to ensure quality and construction period, in terms of manpower, materials, Machinery and tools provide sufficient guarantee for the project. The management of each process should assist each other, guide the construction work on site, and coordinate various types of work well.

2. Organize various types of work to cooperate with construction, intersperse operations, and rush to work on key parts. In order to achieve mutual creation of construction conditions between greening, installation and other types of work to ensure the overall progress of the project.

Section 2 Construction Organizational Structure

The project manager will be responsible for the coordination and arrangement of the construction site for each professional construction team. While ensuring project quality and safety, we must also ensure environmental protection requirements.

Section 3 Construction Management Measures

In order to successfully achieve quality goals,

the main management measures we take are:

1. Listing this project as a key project of our company, it will be directly led by the general manager of the company and a construction site management organization will be formed to give full play to the company's advantages and implement key deployment of the project in terms of the configuration of various construction production factors to ensure the smooth completion of the project.

2. Build a capable, efficient and powerful project management department, select high-quality project managers and management personnel, implement a project management responsibility system, and fully organize technology, quality inspection, materials, safety, labor and management, The finance and other departments conduct systematic and dynamic management of the project construction in an all-round, comprehensive and whole-process manner, and carry out all-round target responsibility management and control on project quality, construction progress, safety production, civilized construction, cost accounting and economic benefits.

3. Use a technically proficient, disciplined and high-quality work team that has been tempered by many large-scale projects to carry out construction on the project, giving full play to our company's management advantages and strengthening functions. , overall coordination and comprehensive management to ensure the realization of the overall project goals.

Section 4 Construction Plan

Construction Preparation

1. Coordinate with the design unit

1. The technical person in charge Assist relevant project personnel to become familiar with the drawings, conduct self-review and joint review of the drawings, and understand the design intentions and construction quality standards so that construction can be carried out correctly. The construction technical team carefully prepares the construction organization design of the project as a guiding document for the construction and production of the project.

2. Through study, become familiar with the content of the drawings, understand the design requirements, the technical standards that should be met during construction, and clarify the process flow.

3. Conduct self-examination, organize construction management personnel of various types of work to review relevant drawings of this type of work, and master and understand the details in the drawings.

4. Organize various professional construction teams to study construction drawings together and agree on construction cooperation matters.

5. Organize a joint review of the drawings, and have the designer explain the details to accurately grasp the details in the design drawings. Production preparation

1. Labor force preparation

1. Establish project construction management according to the determined on-site management organization, and select a high-quality construction team to carry out the construction of the project.

2. Provide necessary technical, safety, ideological and legal education to workers, educate workers to establish the correct thinking of "quality first, safety first", abide by technical regulations on construction and safety, and abide by local regulations Police regulations.

Special professional types of work must be trained and certified to work to ensure the quality of the project.

Material preparation

1. According to the construction progress plan in the construction organization design and the material analysis in the construction budget, prepare the material consumption plan required for the project, prepare and supply materials, and determine the warehouse yard area and Basis for organizing transportation.

2. According to the material demand plan, do a good job in applying, ordering and purchasing materials to ensure that the plan is implemented. Organize materials to arrive as planned and keep them in good condition.

3. For the distribution, use and management of construction materials, formulate a strict material requisitioning system to ensure that materials are collected on demand and according to the construction volume of the day, so as to prevent loss and damage caused by materials after they leave the warehouse. pollute.

Entry stage

Conduct a careful survey of the construction site and reasonably select the material placement area, production area, tool storage area and waste storage area. If conditions permit, a material warehouse should be set up , easy to manage. Formulate the sequence of on-site operations, do not obstruct the construction site of other projects, and reasonably arrange the entry of construction personnel, materials and tools according to the construction level. Organize manpower to create a civilized environment on site, temporarily use electricity to connect lighting preparations, conduct appropriate safety training and technical training for construction personnel before entering the site, promulgate rules and regulations, communicate Party A's requirements, etc., so that the entry into the site is in good order. Construction Phase

According to the project schedule, the project management department organizes and plans the construction. The entire project is divided into green planting, buried cable pipes, street lamp foundation pouring, and green sprinkler irrigation construction. There are overlapping operations in each stage of the construction. The construction should be reasonably arranged to provide the widest working surface for each other, and do a good job in protecting semi-finished products or finished products. Strengthen self-inspection at work, organize manpower to deal with discovered unqualified items in a timely manner, and never let unqualified products flow into the next process.

Division of construction tasks: (planting process)

Greening construction process

Main sub-project construction process block diagram

1. Leveling and cleaning of green land

(1) Level the planting surface according to the design requirements, and remove gravel, weeds and debris at the same time.

(2) The leveling should conform to the terrain and surrounding environment, and be formed into a turtle-back shape, a slope shape, etc. For undesigned terrain, the slope should be set between 2.5% and 3.0% to facilitate drainage.

(3) All green spaces with a width of 50-100CM along the roadside or curbs should be 30CM lower than the roadside or along the curbs, and surface water should be directed to municipal drainage wells during ground treatment. (4) In addition to meeting the landscape requirements, the green space terrain treatment also considers the final collection of surface water to the municipal engineering pipe network for drainage.

2. Planting soil and base fertilizer

(1) The soil quality of the planting soil is loam with a pH value of 5.5-7.5, which is loose and does not contain construction and domestic waste.

(2) The depth requirements for planting soil are: grassland should be greater than 20CM; flowers and shrubs should be greater than 30CM; trees should have a qualified soil layer greater than 80-150CM around the planting soil ball.

(3) The planting layer needs to be connected to the underground layer without isolation layers such as cement boards, asphalt, and stone layers to maintain the upper and lower penetration of soil capillaries, liquids, and gases.

(4) After fertilizing, the ground cover should be plowed to a depth of 20-30M, and the fertilizer and soil should be thoroughly mixed to ensure that the soil is frost-melted, which not only improves soil nutrients, but also Keep the soil loose and well aerated

good. When planting trees and shrubs, mix the fertilizer evenly around the hole before planting, and put it into the bottom of the hole and into the planting pool in sequence.

3. Digging seedlings

The seedling raising time and planting time should be closely coordinated to ensure that the seedlings are harvested and planted on the same day. To facilitate digging, water the soil appropriately 1-3 days before seedling emergence to soften the soil. When starting seedlings, evergreen seedlings should have complete root balls of soil. The survival rate of seedlings with scattered soil balls will be reduced. The size of the soil ball can generally be determined by about 10 times the diameter at breast height of the tree. For tree species that are particularly difficult to survive, consideration should be given to increasing the size of the soil ball. The height of the soil ball can generally be -10CM less than the width. In order to reduce water transpiration of saplings and improve transplant survival rate, rough pruning should be carried out after digging the saplings and before loading.

4. Fixed-point setting-out

(1) Before planting seedlings, fixed-point setting-out should be carried out in strict accordance with the design drawings and drawing review minutes.

(2) Use tape measure, measuring rope, etc. to fix the tree, and nail stakes according to the designed position as the basis for planting. If you encounter obstacles such as manholes and pipes when fixing, you should avoid them. The size of the design should not be rigidly adhered to, but should be adjusted flexibly, and an eye-catching mark should be made with paint or other markers in the center of each plant as a positioning mark.

(3) To lay out lines at fixed points in a patch of green space, measuring instruments can be used, or the grid method can be used to lay out lines. First, use tape measure, measuring rope and other tools on the ground according to the corresponding proportions on the design drawing. Mark a square grid at a distance. The square grid can be painted with white ash, or you can nail stakes and hang lines. Then use these square lines as vertical and horizontal coordinates to correctly position the fixed points on the ground. Nail wooden stakes or sprinkle with white ash to mark; make sure to place < /p>

The location of the line is accurate, the line is smooth, and the area and size are up to standard.

5. Digging holes

(1) The hole location is accurate, and the length, width and height meet the requirements. Before planting seedlings, dig downwards around the designated gray point as the center. The size of the planting hole depends on the size of the soil ball and the condition of the root system.

The soil ball should be 16-20cm larger than the soil ball. The depth of the hole is generally slightly deeper than the height of the soil ball (10-20cm). The upper and lower calibers of the hole should be the same size, and there should be no "pot bottom hole" and other phenomena.

(2) After digging the planting hole, you can fill it with some topsoil and then lay a layer of fully decomposed base fertilizer. A layer of loam with a thickness of more than 5cm should be spread on the base fertilizer.

(3) When digging holes, pay attention to the direction of underground pipelines. When encountering foreign objects underground, do "first exploration, second testing, and third digging" to ensure that underground pipelines and structures are not damaged by digging.

6. Transporting seedlings and planting materials

(1) Ensure that the soil balls of all trees and shrubs are intact and not loose or broken during seedling raising, transportation, planting, etc. The wrapped earth balls are uniformly wrapped with grass and wrapped with hemp rope in the shape of "rice".

(2) The seedlings are picked up, packaged and transported immediately. Bag seedlings and potted seedlings are transported by stacking, and large seedlings are transported by slight tilting.

(3) During the transportation of seedlings, a certain amount of moisture must be maintained. During long-distance transportation, water must be sprayed in time and handled with care to prevent the mud from loosening.

(4) The transportation of planting materials such as organic fertilizers shall be carried out using bulk material transportation specified by relevant departments.

(5) Only after the seedlings and planting materials have passed the acceptance inspection are they allowed to enter, and then proceed to the next process.

(6) During the transportation of seedlings, send a dedicated person to follow the vehicle. It is required to discharge in batches according to different types and sizes. Keep the soil ball of the sapling intact and the bark of the trunk undamaged.

(7) Seedlings should be planted immediately after arriving at the construction site to prevent branches and leaves from wilting due to water loss.

7. Planting

(1) After the seedlings are transported to the construction site, the necessary seedlings should be moderately pruned. After pruning, they can be planted. The location of the planting should meet the design requirements.

(2) The construction method of planting is: before planting, the base fertilizer and crushed soil should be fully mixed, and the rows of trees should be aligned in a straight line, and arranged in order according to the natural height of the planted seedlings. Put the soil ball of the seedling into the planting hole and make it centered; then stand the tree trunk upright and keep it vertical; then backfill the hole in layers so that the soil surface can cover the root and neck of the tree. After initial planting, you should also check whether the trunk is still vertical and whether the crown is deflected; if it is deflected, it must be straightened. While straightening the tree, add planting soil. The planting soil should be crushed and tamped in layers with wooden sticks so that the roots are in full contact with the soil. Finally, the remaining hole soil is cultivated around the root neck to form a circular water-blocking cofferdam. The diameter of the cofferdam should be slightly larger than the diameter of the planting hole. The weir soil should be compacted and not loose.

(3) If necessary, provide support after planting. Water the first time within 24 hours after planting. The water should be poured thoroughly so that the soil can fully absorb water and the roots and soil can be closely integrated to ensure that the soil is fully absorbed. Conducive to root development. Water the second time after 3-5 days and the third time after 7-8 days.

(4) After planting, road trees can be reinforced with concrete pillars. The specific specifications of the tree support stump are: 250*10*10CM, 4 φ6 bars are installed in the column, C20 concrete, the column burial depth is 70CM, the inner spacing is 85CM, the wooden board specification is 110*8-10*2.5-3CM, used between the tree trunk and the wooden board 2. 5*0.5-0.8CM black wheel tape is adjustable for binding, and the wooden boards and concrete columns are tied with iron wires.

(5) Except for road trees, plant trees with bamboo support. Each tree has 3 bamboos, 3-5 meters long, and a tail diameter greater than 4CM.

(6) When planting ground cover, you should pay attention to planting immediately after planting. Start planting from the center pattern and then expand to the edge. When planting in a single-sided ornamental flower bed, plant from the back and gradually plant to the front. If the plants are slightly uneven in height, the shorter plants should be used as the standard. For taller plants, plant them deeper and ensure that the spacing between rows meets the design requirements.

(7) When planting, pay attention to the uniform density. All trees should be planted from the inside to the outside, from large to small, first trees, then shrubs, and then lawn.

(8) When planting, pay attention to adjusting the direction of the crown, so that the most beautiful side faces the main viewing surface. The posture of the tree must also be adjusted. If the tree is suitable for lying horizontally or tilted, the trunk must be planted horizontally or tilted. The treatment of the tree shape during planting shall be based on the needs of landscaping. After the trees are planted, concrete pillars or moso bamboo should be used as supports according to regulations, and sufficient root water should be poured into them.

(9) The lawn should be leveled according to the design elevation. To ensure that the soil quality of the green space must meet the soil quality requirements, clean up debris, level it to the required slope, spread base fertilizer evenly, and then plow it once. , mix the fertilizer and soil thoroughly. During the plowing process, if it is found that the local soil quality is not good

, the soil should be replaced. Then the blocks of turf are planted continuously, and the gaps between the grass blocks are less than 2CM. Then pour enough water to set the roots, and after it is dry, pound it firmly to make it fully contact with the soil. Pat three or more times every other day to make the grass solid and smooth. 8. Pruning and shaping

(1) When planting seedlings, pruning before planting is mainly done for transportation and reducing water loss; after planting, plant landscaping and the basic shape of the plants should be fully taken into consideration before pruning. Prune, remove shady branches, diseased branches, etc., and deal with the cuttings.

The initial crown shape of the seedlings after planting can not only reflect the initial effect, but also help form a beautiful crown shape in the future to achieve the purpose and final effect.

(2) Wipe off adventitious buds to protect the main branches: For trees on the road, such as cut-stem trees, the buds will be very irregular after surviving. At this time, all adventitious buds should be wiped off below the height of the designed branches. , select three to five new shoots above the height of the branch that are strong and growing well and are conducive to forming a uniform crown, and erase the rest. The remaining trees and shrubs need to remove new buds according to the landscaping requirements, mainly to use them to form beautiful tree shapes. 9. Cleaning up the construction site

After the completion of each sub-project, construction debris around the construction site should be quickly cleaned up immediately and road facilities accidentally damaged during the project should be maintained. Ensure that roads and construction sites are clean and tidy and reflect the spirit of civilized construction. At the same time, take product protection measures. Regularly assign personnel to clean the environment around the construction site.

Sprinkler irrigation construction

1. Excavation: First, measure the coordinates and elevation of the pipeline according to the requirements of the construction drawing, and then lay out the line according to the direction shown in the diagram to determine the trench position, width and depth. Then dig the trench.

2. Cleaning of pipes: Clean the pipe bones and debris, and check the pipes for cracks and blisters.

3. Pipe placement and connection: Place the pipes of various specifications in the corresponding trenches first, and then connect and install the corresponding pipes, fittings and valves. Test:

A. Connect the pressure test device first; B. Connect the water source and dig the drainage trench; C. Fill the pipe with water and open the vent valve at the same time. The vent valve will continuously discharge water. It indicates that the air in the tube has been exhausted and can be pressed after it is filled with water. D. Before increasing the pressure, check all interfaces, supports and blocking plates. If any problems arise, the pressure should be increased only after they are resolved. E. The pressure should be increased slowly, about 0.2Mpa each time, and each interface should be observed for leaks. If there is no problem, continue to increase the pressure to the active test pressure. Stop the pump and check. There is no pressure drop on the pressure gauge within 10 minutes. If the pipes, accessories and interfaces exceed 0.05Mpa and there are no leaks or cracks, it proves that the strength test is qualified, and then the pressure is reduced to the working pressure for tightness testing. F Make test records and fill in the "concealed engineering records".

5. Flushing and disinfection of pipelines: Before disinfection, flush the water pipes with high-speed water first, select a few points at the end of the pipeline to discharge the flushing water, and flush until the discharged water contains no impurities. Disinfection.

6. Backfill: Backfill is not allowed to contain rocks with a diameter greater than 100mm.

Section 5 Curb Stone Installation and Construction

Main Construction Equipment

Based on the characteristics of the process to be used and considering the conditions of the construction site, the small equipment used is as follows Table:

1) Curb stone construction technical plan

Curb stone construction process:

Measurement and laying out foundation trench, hanging wire, seat slurry, curb stone Installation

Leveling and curing of joints

1. Measure and set out the lines

First, use a total station to measure and set out the edge of the installed curb according to the drawing design, and use a level Measure the release elevation line.

2. Excavating the foundation trench

The curb stone foundation trench to be installed will be manually excavated and shaped.

3. Hang the construction line according to the measured setting point (rebar) and start installing the curb stones. Ensure straight lines and smooth curves. When installing curbs, the curbs must be installed and inspected with a ruler or level to make sure they are horizontally and vertically, ensuring they are round and straight. The straightness of the installed curbs shall not exceed 10mm every 20m, the height difference between two adjacent blocks shall not exceed 3mm, the width of the gap between the curbs shall be 10m, and the allowable deviation shall be ±3mm.

5. Grouting and pointing out the joints

After the installation is completed and the inspection is qualified, use 10# mortar to grout the joints. The mortar must be full and dense.

Then use M10# cement mortar to make the seams, the seams are concave seams, and the seam depth is 10mm.

6. Health maintenance

Maintain health at the right time every day according to weather conditions. The health maintenance period should be no less than 7 days.

2) Quality inspection

1. Raw material quality

(1) Cement: For the same manufacturer, same quality, same number, and same production entering the site The cement of the date shall be accepted in batches of 200t (those less than 200t shall be treated as one batch). Each batch shall be sampled at least once to conduct tests on mortar strength, safety, setting time, fineness and other items. If you have any doubts about the quality of cement, you can entrust the relevant unit to conduct analysis and testing of the constituent materials. When in doubt about the quality, check at any time.

(2) Water: non-drinking water, its quality should be checked before use. (3) Aggregate:

Medium sand: For medium sand from the same source and mining unit entering the site, every 200m2 is a batch acceptance, and each batch is sampled at least once and a screening analysis test is carried out. , specific gravity test, bulk density test, mud content test.

2. Inspection of the quality of curb stone installation (1) Basic requirements

The mortar mix ratio is accurate; the curb stones are smooth and neat. (2) The inspection items for curb stones are as follows.

Curb stone inspection items

3) Safety measures

1. Strengthen safety education, enhance safety awareness, and strictly follow safety operating procedures for construction. 2. Establish a safety organization structure and formulate a safety position responsibility system.

3. There is a full-time safety officer on site to follow the work, and on-site construction workers must wear safety helmets.

4) Measures to ensure project quality

1. Promote total quality management, extensively carry out mass QC group activities, operate in accordance with the quality assurance system, and gradually improve it.

2. Implement technical briefings, organize training and learning for relevant construction personnel, and construct in strict accordance with operating procedures.

3. Strictly implement a self-inspection system and report for inspection in a timely manner according to inspection procedures. 4. Technical personnel and quality inspectors must stand by during the construction process.

5. Implement a job responsibility system, assign responsibilities and posts, and strictly reward and punish employees based on quality.

5) Ensure civilized construction measures

1. Construction should be carried out in strict accordance with construction specifications and safe operating procedures, warning signs should be hung at the work site, and illegal operations and barbaric construction are strictly prohibited.

2. Construction machinery must be operated in strict accordance with safe operating procedures, and operators must be certified to work. 3. The construction site should be neatly planned, materials should be stacked neatly, transportation roads should be clear, and site drainage measures should be taken.

4. During construction, it is the responsibility to protect the ecological balance of the construction area and prevent environmental pollution. From construction to completion acceptance, every link should consider various impacts on the surrounding environment. various protective measures for different problems to ensure that the environment is not polluted and no future troubles are left. 6) Main construction measures to control construction progress and ensure the construction period

1. The construction period of this project requires 40 days (calendar days). On the premise of ensuring quality and reasonable construction sequence, continuous construction will be organized when necessary to ensure Make the most of limited time.

2. Develop a construction period control plan; according to the construction period schedule determined by the on-site command headquarters, conduct self-inspections every day and conduct period analysis once a week to ensure construction progress.

3. Implement the construction period contracting system; each type of work must contract the construction period according to the issued construction task order, and those who advance the construction period will be rewarded and those who delay the construction period will be punished.

4. According to the needs of the construction site, the company will redeploy the required technical workers at any time to ensure on-site employment.

5. The company sets up a special construction leadership group, with the company’s general manager or relevant department leaders participating in the support and supervision of the project management department. It holds an on-site office meeting every week to focus on checking the implementation of the construction progress plan, such as If there is a problem, the company's special leadership group will propose solutions and solve it within a time limit to ensure that the construction period is completed on time or ahead of schedule.

6. If the contracting team cannot complete the specified construction period, they will be fined accordingly. 7. Project progress funds are used exclusively as special funds and cannot be used for other expenses of the company.

Construction progress bar chart

6. Main construction machinery and equipment selected and entry and exit plan

7. Timely entry and exit plan for labor requirements