In urgent need of a construction organization design plan

Harbin Ninth Middle School Teaching Building

Steel Structure Grid Engineering

Construction Organization Design

(2003 Edition)

Preparation:

Review:

Approval:

Date:

Harbin Institute of Technology Space Steel Structure Co., Ltd.

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April 5, 2003

1 Project Overview

The teaching building project of Harbin No. 9 Middle School is a new construction project, and the project structure is a steel structure welded spherical grid. , using segmented lifting.

2 Project Characteristics

1. The form of the grid is a square-sided pyramid welded ball grid;

3 Project Objectives

1. Quality goal: excellent engineering

2. Safety goal: no casualties

3. Construction period requirements: Complete 3 days in advance according to the construction period

4. Civilized construction: reaching provincial civilized construction standards

4. Construction preparations

1. Establish organizational structure

Project manager: Yang Mingxin

Technician: Wang Jingchao

Quality inspector: Liu Haifeng

Safety officer: Jin Guoxing

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2． Main machinery and equipment for construction:

Table of machinery and equipment for construction

Equipment name Unit Quantity

Welding machine 20kw 3 units

Electric cutting Machine 1

Level, longitude and latitude 1

Switch box 1

3. Establish a quality control organization

In terms of organizational structure, establish a quality assurance organizational system in which the project manager is directly responsible, full-time quality inspectors perform operational inspections, and team quality supervisors self-inspect and mutual inspection. Each position, The quality responsibilities of each employee are included in the job contract of the project contract, and strict reward and penalty standards are formulated to ensure that every step and part of the construction process is under control and linked to economic benefits to ensure the overall quality of the project. level.

4. Main labor force plan

Main labor force plan table

Type of work Number of people Remarks

Force worker 8

Lifter 6

Welder 4

Electrician 1

Riveter 10

Lineman 1

Scaffolder 4

Oiler 4

5. Construction technical preparation:

a. Organize engineering and technical personnel to study construction drawings, understand design intentions, further clarify project characteristics, jointly review drawings, eliminate errors, omissions, collisions, and defects, and resolve conflicts between design and construction technology;

b. When preparing the construction organization design, all aspects should be taken into consideration and key points should be highlighted. Use construction drawings, construction specifications, quality standards, operating procedures, and preparation of construction schedules as guiding documents for organizing construction;

c. Prepare construction budgets, calculate the project quantities of each sub-project, analyze labor and technical strength, establish construction technology and machinery management institutions, organize quality and safety systems, and formulate detailed construction plans;

d. We should do a good job in explaining the technology of each type of work, and do a good job in explaining the safety, technology, quality, and special processes of workers entering the site.

6. Preparation of construction materials:

a. Book and purchase materials according to design and specification requirements;

b. Processing of finished products and semi-finished products;

c. According to the construction progress, construction machinery, scaffolding materials, etc. will be arranged to enter the site in phases as needed.

7. Construction site preparation:

a. Ensure three connections and one level;

b. On-site control network measurement;

c. Set up temporary facilities for construction and storage areas for various machines, tools and materials;

d. Be waterproof and windproof.

6 Specifications and standards for construction execution

a. Implementation standards for engineering material procurement:

"Steel Structure Design Code" (GBJ17-88), "Steel Structure Engineering Construction and Acceptance Code" (GB50205-2001), "Grid Structure Design and Construction Code" ( JGJ-91)

b. Construction and acceptance execution standards:

"Steel Structure Engineering Construction and Acceptance Specifications" (GB50205-2001), "Steel Structure Engineering Quality Inspection and Assessment Standards" (GB5021-2001), "Grid Structure Design and Construction" Regulations" (JGJ-91)

7 Construction Technology and Main Construction Methods

The grid is first assembled on the ground and hoisted using a 10-ton guide chain.

Grid structure construction process:

Material procurement → Welding ball production → Bar cutting → Anti-corrosion treatment → On-site assembly → Hoisting → Anti-corrosion → Topcoat → Delivery and acceptance

7.1 Steel component processing, production and installation plan

7.1.1 Steel structure procurement

a. Arrange personnel with rich experience and technical knowledge to be responsible for purchasing and ordering. It is necessary to According to the material plan

Purchase the materials in strict accordance with the drawing requirements and specifications. And passed the third level

check.

b. Whether the quantity and variety of steel products are consistent with the order order.

c. Whether the quality warranty of the steel is consistent with the mark printed on the steel. Each batch of steel must have a material certificate provided by the manufacturer, indicating the heat number, steel grade, chemical composition and mechanical properties of the steel. Various indicators of steel can be verified according to the provisions of national standards (GB 700-79) and (YB 13-69).

d. Check the specifications and dimensions of the steel. The allowable deviations of various types of steel materials can be checked with reference to relevant international or standard regulations.

e. Surface quality inspection of steel. Regardless of flat steel, steel plates or shaped steel, defects such as scarring, cracks, folding and delamination are not allowed on the surface. Those with the above defects should be piled up separately for research and processing. The depth of corrosion on the steel surface must not exceed its thickness tolerance.

f. If after inspection it is found that the data on the "Steel Quality Guarantee" is unclear and incomplete, the material markings are unclear, and the surface quality and appearance dimensions do not meet the relevant standards, the inspector must report it to the factory's material quality department. Upon request for review, the functional personnel will make a ruling and conduct re-inspection and appraisal based on the importance of the project and the specific circumstances of the steel quality. Only materials that pass the re-inspection will be allowed to be officially put into the warehouse. Unqualified steel materials should be dealt with separately.

7.1.2 Inspection of steel structural components

1. Setting out and numbering materials

Setting out error control

Deviation name Parallel line distance and segment size Width, length Hole spacing Difference between two diagonals Processing template angle

Deviation limit ±0.5mm ±0.5mm ±0.5mm 1.0mm ±20'

Material tolerance

Serial number Item Tolerance value (mm)

1 Length ±1.0

2 Center-to-center distance between two ends ±0.5

3 Diagonal difference 1.0

4 Center-to-center distance between adjacent holes ±0.5

< p>5 Two rows of hole center distance ±0.5

6 Punching and hole center distance displacement ±0.5

2. The specific requirements for processing steel structure components are as follows:

a. The quality must meet the "Steel Structure Engineering Construction and Acceptance Specifications" (GBJ2058)

b. Mechanical rust removal is used;

c. After removing rust from the surface of all components, apply an alkyd primer;

d. Missing edges on the edges of cuts or bevels can be machined or repaired when they are 1-3mm. Grind smooth, and the groove does not exceed 1/10; when the edge or groove exceeds 3.0mm, low-hydrogen welding rods below φ3.2 should be used for repair welding and grinded smooth;

e. Bolts The allowable deviation of the hole diameter must be controlled between 0-1mm; when the nominal diameter is 13.5, 17.5mm, the allowable deviation of the roundness (the difference between the maximum and minimum diameter) is 1mm; the nominal diameter is 22, 24, 26, 30, 33mm When , the allowable deviation of roundness (the difference between the maximum and minimum diameters) is 1.5mm; the verticality of the bolt shall not be greater than 0.03t and not greater than 2.0mm;

f. The allowable deviation of the hole spacing:

The allowable deviation of the distance between two adjacent holes in the same group must be controlled within ±0.7mm. The allowable deviation of the distance between any two holes in the same group must be controlled within ±1.0mm. The allowable deviation of the distance between two adjacent holes must be controlled within ±1.0mm. The allowable deviation must be controlled within ±1.2mm;

g. After passing the mechanical leveling, they will be numbered in sequence.

7.1.3 Transportation and Storage of Steel Structural Components

a. Accessories shall be shipped in order of model. Cargo is transported by truck, and loading and unloading should be smooth to avoid littering and collision with each other.

b. The storage warehouse should be flat, rainproof, and waterproof, and the material should be padded flat. Stacked neatly and numbered in order for easy collection.

7.1.4 Steel structure welding engineering

Welding deviation control target (mm)

Project allowable deviation Project allowable deviation

Butt welding Seam Weld seam

Relief height S≤20 0.5～3 Fillet weld seam Weld seam

Relief height K<6 0～+2

S≤20～ 40 0.5～3 K=6～14 0～+3

S≤40 0.5～4 K>14 0～+4

Welding seam misalignment ≤0.18 Welding

Feet

Feet

inch K<6 0～+2

Combination

Weld S≤20 0～ +2 K=6～14 0～+3

S≤20～40 0～+3 K>14 0～+4

S≤40 0～+4

a. Welding rods, flux, welding wire and protective gas for welding must comply with the design requirements and special regulations for steel structure welding; welding rods, flux, etc. must not be used when they are damp;

b. It must be ensured that the construction temperature is above +5℃;

c. Welders must pass the examination and obtain recent certificates for corresponding welding conditions;

d. For welds that bear tension or pressure and require the same strength as the base material, the results must comply with the design requirements, construction specifications and special regulations for steel structure welding;

e. Defects such as cracks, slag inclusions, weld nodules, burn-through, arc craters, needle-shaped pores, and melting point spatter are strictly prohibited on the surface of the weld. The pores and undercuts must comply with construction regulations, the welding wave must be uniform, and welding slag and spatter must be removed;

f. Randomly check 5% of the number of welds, and check one weld for each weld, but not less than 5;

g. The allowable deviation of weld size should comply with the provisions of Table 8.1.7 in Chapter 8 of the "Construction Engineering Quality Assessment Standard" (GBJ301-88);

h. When cracks appear in the weld, the welder is not allowed to handle them without authorization. The technical person in charge should be informed to find out the cause and formulate repair measures before handling;

i. It is strictly prohibited to spark arcs on the base metal outside the weld area.

7.1.5 Steel structure painting project

a. Main processes of steel structure painting project

Steel structure painting construction sequence:

Mechanical rust removal→spray the first anti-rust primer→local putty→polishing→→second primer→reply putty→repair primer

(a) All kinds of anti-corrosion materials are Should comply with relevant national technical indicators and product factory certificates;

(b) Make technical (quality) disclosures to the construction team;

(c) There shall be no steel structure components Rust, weld coating, welding spatter, oil, dust and other debris; the surface of the steel should show a metallic luster;

(d) The components qualified for rust removal are to be painted with primer and left until completely dry Apply a second coat of primer;

(e) After the installation is completed and accepted, clean the components; repaint the components that have been burned or touched.

(f) The coating should be consistent in color, bright, bright, and free of pimples and sag; the temperature of the working place during coating should be between 5-38°C, and the relative humidity should not be greater than 85%. In rainy days or on the surface of components, It is not suitable to work when condensation occurs; it is strictly prohibited to be exposed to rain within four hours after painting;

(g) The thickness of the dry paint mold should comply with the requirements of Table 8.5.8 in Chapter 8 of (GBJ301-88);

7.1.6 Arrangement of construction sequence: After the pre-construction preparations are completed, the start-up report is processed, and the team enters the site to officially start construction. The entire grid construction is divided into two parts: grid shell assembly and assembly.

The construction sequence of grid assembly is as follows:

Site leveling - laying scaffolding platform - grid control point positioning - grid assembly assembly - assembly inspection - grid welding - grid hoisting

7.1.6.1 Construction technical measures

7.1.6.1.1 The allowable deviations for the installation of grid structures are as follows:

7.1.6.1.2 Longitudinal and transverse lengths : ±L/2000, ±30ｍｍ.

7.1.6.1.3 Maximum height difference between support centers: L/3000, 30mm.

7.1.6.1.4 Height difference between adjacent supports of peripheral support grid: L/400, 15ｍｍ.

7.1.6.1.5 Maximum height difference of supports: 30ｍｍ

7.1.6.1.6 Height difference of adjacent supports of multi-point support grid: L/800, 30mm.

7.1.6.1.7 Bar bending height: L/1000, 5ｍｍ.

7.1.6.1.8 Secondary re-inspection of materials entering the site.

7.1.6.2 Welding ball inspection:

7.1.6.2.1 Document inspection includes material (steel, welding materials) certificates, product factory certificates, and ultrasonic flaw detection reports.

7.1.6.2.2 Physical inspection shall be carried out according to the items listed in the table.

Quality control of welded ball production

Serial number Item Allowable deviation (mm) Inspection method

1 The height of the ball weld is parallel to the surface ±0.5. Use a weld gauge, Take 8 points for inspection along the circumference of the weld

2 Ball diameter (≤300ｍｍ) ±1.5 Use calipers to check, and measure three values ??for each ball

3 Ball diameter ( ≥300ｍｍ) ±2.5 Check with calipers, measure three values ??for each ball

4 Wall thickness reduction ≤13% and <1.5 Check with mold set, take a point on the largest misaligned edge of each ball< /p>

5 The amount of misalignment <1.0 is measured with a thickness gauge

7.1.6.2.3 Check the quantity, randomly check 5% of each specification, and no less than 5 balls.

7.1.6.2.4 Inspection of rods:

7.1.6.2.5 The allowable deviation of the straightness of the rod axis is L/1000, and not greater than 5mm, L is the rod Piece length, 5% of each type of rod shall be randomly tested, and no less than 5 pieces.

7.1.6.2.6 Rod blanking

Note: The 45-degree angle between the rod and the steel ball is quoted from "The Riveter" China Construction Industry Press P353.

7.1.7 Assembling and welding of the grid:

7.1.7.1 Based on the grid diagram of the grid and combined with the actual situation on site, determine the position of each bottom ball when making the grid on the ground. Set up steel pipe supports.

7.1.7.2 After the grid assembly is completed, it should be inspected according to the items listed in the "Steel Structure Construction Specifications". If it is unqualified, it should be repaired immediately. After passing the geometric dimension inspection, ultrasonic flaw detection will be carried out on the weld.

8 Quality assurance measures

a. Conscientiously implement the quality policy of "guaranteing quality, emphasizing credibility, customer first, dedicated service, building high-quality products, creating first-class products, scientific management, and ranking among domestic and foreign companies" , according to the requirements of various program documents established by the company in accordance with ISO9002 quality assurance system standards, each shall be responsible for the quality control and management of the entire construction process;

b. Make preparations for construction, Prepare a feasible construction plan according to the drawings and design requirements, and have operation instructions for key processes;

c. The project manager must personally control the quality, and the quality inspectors are responsible for the grassroots establishment, and each team leader participates The quality control team should improve the organizational structure, improve the target management responsibility system, assign quality targets to each team and each position, and link the completion of targets with personal economic interests to maximize the enthusiasm of all employees and establish The awareness of "quality first" ensures that engineering projects achieve the overall goal of provincial high quality;

d. Strengthen the on-site inspection and verification system for raw materials and semi-finished products, and mark and mark them according to the quality status to ensure good quality to prevent substandard products from entering the construction site;

e. Develop internal quality control standards, conduct self-inspection, mutual inspection, and handover inspection, and implement the "model system" for construction procedures and the "tag system" for operators, Ensure product quality and achieve traceability of quality responsibilities;

f. Implement a regular quality analysis meeting system, identify problem-prone links based on cause-and-effect analysis and histogram statistical analysis, and avoid the production of substandard products;

g. After each process is completed, it must be inspected, evaluated and accepted by the construction supervision and quality inspection department before the next process can be constructed;

h. All construction personnel must go through the induction process Training, special types of work must be carried out with certificates;

i. Take various protective measures for finished products, and set up dedicated maintenance or additional protective measures for the previous process;

j. Construction site Relevant technical specifications and procedures are necessary so that quality work can be followed by rules and laws.

9 Safe production and civilized construction measures

a. Establish and improve on-site safety production position responsibility system, conscientiously implement various national policies and regulations on labor protection and safety production, and ensure project safety ;

b. Implement a one-vote veto system for safety work. When there is a conflict between production and safety, everything must make way for safety;

c. Carry out various safety education and clarification work , strictly implement safe operating procedures to prevent personal casualties;

d. Give full play to the role of the "three treasures" of safety and do a good job in safety protection. Buildings are equipped with fully enclosed nets, and safety belts must be worn when working at heights. ;

e. All construction workers entering the site must wear safety helmets, and the fine system for safety violations is enforced;

f. Take practical safety measures for each process: when installing steel structures, A dedicated person must be assigned to direct the operation, and the restricted area for work must be demarcated, with fences and eye-catching markings; check whether the slings are firm before lifting, and it is strictly prohibited to remove the ropes without the permission of the safety personnel; no fighting is allowed on the installation operation platform, and no overloading of materials is allowed. When laying the probe board, you are not allowed to dismantle the scaffolding rods without permission;

g. For special types of work and processes, the inspection and acceptance of safety measures must be strengthened (such as night construction must have sufficient lighting, installation The operating platform must be inspected and accepted before being allowed to be used, etc.);

h. Strictly implement the technical specifications for temporary power use at the construction site. The on-site power supply must be set up according to the temporary power construction organization design plan. Indiscriminate connection is strictly prohibited. Wires; construction machinery and tools are protected by one machine and one gate, and lighting electricity is protected by 36V safety voltage;

i. Building materials and steel structural components are stacked neatly according to the construction site plan, and the work area must be cleared after completion;

j. Adhere to civilized construction, carry out a reasonable layout of the construction site, divide the work into pieces, and assign dedicated personnel to take charge. The roads, water and electricity facilities and material stacking on the site must be set up in strict accordance with the planned location of the master plan. After the construction is completed, In the working section, adhere to the principle of who is responsible for the construction, making the entire construction site a civilized and tidy place;

k. Set up safety gates, set up project announcements, civilized construction standards and eye-catching slogans.

10 Measures to ensure the construction period

In order to ensure that the project can be completed within the specified time, the following measures are taken:

a. Select production management personnel with rich construction experience Project manager, select management personnel with strong professional ability and high technical level to form an efficient and capable project team;

b. Organize construction scientifically, and the project management department executes the plan to complete the plan on the same day to ensure daily maintenance Ten days, ten days to protect the month to ensure the completion of the plan;

c. Make full use of the network plan and seize key processes and links to ensure the implementation of the plan;

d. Adopt new technologies , new equipment to improve the comprehensive construction period;

e. In terms of material supply, the Materials Department has formed a special material supply group locally to implement one-stop supply from procurement, transportation, semi-finished product processing, etc., and designate dedicated personnel for special projects and fixed positions. Funds are earmarked to ensure the procurement and entry of materials;

f. Select skilled construction workers of various types of work to enter the site. As long as the project requires people, no matter what position they are in, they will be immediately transferred. Implement all-round investment on call;

g. Create a good construction environment and a tense construction atmosphere, work closely with all majors and types of work, intersperse operations, provide unified guidance, and make overall arrangements.

11 Cost Control Measures

a. Do a careful review of drawings and solve problems before construction to avoid unnecessary losses caused by design problems;

< p>b. Adopt reasonable technical solutions and measures during construction to reduce direct project costs;

c. Make overall arrangements for labor and machinery, and implement segmented flow operations to reduce the construction period and improve work efficiency;

d. Seriously promote the application of new technologies, reap benefits from new technologies, and reduce project costs;

e. Do a good job in earthwork balance and deployment, and do a good job in cross construction;

f . Implement quotas for picking materials to ensure that the work is completed with clean materials;

g. Strengthen equipment maintenance and extend service life.

12 Protection measures for finished products and semi-finished products

In order to ensure that the quality of finished products and semi-finished products is intact during the construction process, the following measures have been formulated:

a. Strengthen the quality of the construction team Awareness of finished product protection, violators will be severely punished;

b. If the steel components entering the site cannot be used in the project in time, proper storage measures should be taken.

13 Construction and fire prevention measures:

Strengthen fire safety work. Fire must be applied for. Approved fire sources must be guarded by dedicated personnel. Open flames are strictly prohibited on site, and various fire protection measures are in place. , Wear a safety helmet when entering and exiting the construction site to prevent injuries from falling foreign objects. Pay attention to safety when working at heights. Materials must be stacked in an orderly manner to prevent random piles. During the construction process, coordinate with other majors when there is cross-operation. Cooperate to achieve civilized construction, pay attention to fire prevention in places with flammable materials, and set up fire extinguishers, sandboxes and other fire prevention facilities at the construction site.

14 After-sales Service: (Completion Quality Guarantee)

In years of production practice, our company has formed its own set of unique and efficient design and production management systems, and has always maintained The tradition of providing customers with good after-sales service has been well received by customers. For this project, we propose the following after-sales service items:

1. After the project is completed, a comprehensive quality inspection will be conducted and it will be handed over to the user in good condition;

2. The quality warranty period is ten years. If problems arise due to our quality, our company will repair them free of charge. If the warranty period exceeds, our company will implement non-profit paid services for product quality;

3. If a problem occurs after the project is completed, our company guarantees to respond within 24 hours from the time we receive the notice from the owner, and to rush to the construction site to troubleshoot within 72 hours;

4. Our company's quality investigation team not only conducts on-site surprise inspections of the quality of projects under construction, but also conducts quality tracking of completed projects every two years, visits users, and then draws up a single project quality status table to determine the possible quality of the project. If any problems arise, contact the user for timely control.