Chapter 1 Introduction

As a cable system, a cable-stayed bridge has a greater spanning capacity than a beam bridge, and is the main type of a long-span bridge. A cable-stayed bridge is made up of many steel cables directly connected to the tower. The cable-stayed bridge consists of a pylon, a main beam, and a stay cable. Pylon types are A, inverted Y, H, single column, and materials are steel and concrete. The stay cable is arranged with a single cable surface, a parallel double cable surface, and a cable surface. On both sides of the tower are symmetrical stay cables, which are connected by the stay cables.

Cable-stayed bridges are one of the most popular types of long-span bridges in China. There are more than 3 cable-stayed bridges completed or under construction so far, second only to Germany and Japan, ranking third in the world. The number of Lei span concrete cable-stayed bridges has ranked first in the world.

In the mid-1950s, Sweden built the first modern cable-stayed bridge. For more than 40 years, the development of cable-stayed bridges has a strong momentum. China began to build concrete cable-stayed bridges in the mid-1970s. After the reform and opening up, the momentum of building cable-stayed bridges in China has been on the rise.

China has always been focusing on the development of concrete cable-stayed bridges. In recent years, China has begun to build steel and concrete hybrid cable-stayed bridges, such as the Shantou Stone Bridge, with a main span of 518m; the Wuhan Yangtze River Third Bridge, with a main span of 618m. Steel box cable-stayed bridges, such as the Nanyang Bridge of the Nanjing Yangtze River Second Bridge, have a main span of 628m. The Nanpu (main span 423m) and Yangpu (main span 602m) bridges built in Shanghai in the past few years are steel-concrete cable-stayed bridges.

Generally speaking, cable-stayed bridges with a span of 300-1000m are suitable. In this span range, cable-stayed bridges have more obvious advantages than suspension bridges. F. Leonhardt, a famous German bridge expert, believes that even a cable-stayed bridge with a span of 1400m can save half of the high-strength steel wire of an equivalent-span suspension bridge, and its cost is about 30% lower.

The development trend of cable-stayed bridges: the span will exceed 1000m; the structure type is diversified and lightweight; the research on strengthening the anti-corrosion protection of cable-stayed cables; pay attention to the adjustment of cable forces, construction observation and control, and research on dynamic problems of cable-stayed bridges.

Chapter 2 Compilation Principles

2.1 Basis of preparation

The main compilation basis of this construction organization design is:

(1) Bidding documents for the central river bridge project.

(2) The company's understanding of the site survey of the construction site; based on the construction conditions, the surrounding environment and the technical strength, construction experience, team quality, construction production capacity and resource status of the construction site inspection and understanding.

(3) Based on the actual investigation of water, electricity, road and material resources required for the construction of this project.

(4) Design drawings and relevant national regulations and industry standards.

(5) Reference materials such as construction manuals, labor quotas, and budget data.

(6) ISO9001: 2000 quality management standard.

(7) Standard requirements and regulations on safe production, environmental protection and civilized construction.

2.2 Establishment principles

1. In accordance with the principles of the terms of the bidding documents, in the preparation of the text description of the construction organization design and the accompanying drawings, strictly follow the provisions of the bidding documents to achieve unified standards and norms.

2. Follow the principles of design documents and standard acceptance standards, strictly compile design requirements for major project construction methods, implement current construction specifications and acceptance standards, properly organize construction, and ensure project quality and progress.

3. Adhere to the principle of seeking truth from facts, and in the formulation of construction plans, according to the company's construction capabilities, economic strength, and technical level, adhere to scientific organization, reasonable arrangements, balanced production, and parallel operations to ensure high speed, high quality, Efficiently completed.

4. Adhere to the principle of strict management throughout the construction process. In the process of construction, strictly follow the instructions of the owner and the supervision engineer, respect the opinions of the owner and the supervision, and strictly manage.

5. Adhere to the principle of actively promoting the application of the "four new" achievements. In the construction of each process, it can actively improve the quality of the construction of the project and adopt new materials.

6. Adhere to the principle of combining professional operations with comprehensive management, and take professional operations teams as the basic operation form. At the same time, use integrated management methods and rational deployment to achieve the purpose of overall optimization.

Chapter 3 Project Overview

3.1 Introduction

This bridge is the second contract section of the expressway. The bridge piles K0 + 307.17 ~ K0 + 417.17, with a total length of 110m, the center pile K0 + 362.17, and the highway cross K18 + 225. The upper structure adopts (20 + 32 + 32 + 20) m prestressed reinforced concrete cable-stayed bridge-continuous beam combination system, and the tower pier beam is consolidated. The substructure adopts round-end bridge pier, ribbed platform and bored pile foundation.

3.2 Main technical standards

Bridge width: 1.0 (cable zone) + 0.5m (guardrail) + net-7.0m (lane)

+ 0.5m (guardrail) +1.0 (cable zone) = 10.0m

Bridge deck slope: 2%

Longitudinal slope of bridge: 2.6%

Design load: Car—Class 20, Trailer—100

Earthquake Intensity: Basic Intensity Ⅶ, fortify by Ⅷ

Deck Pavement: 6 ~ 13cm No. 40 concrete leveling layer + 6cm asphalt concrete pavement

3.3 Main materials

3.3.1 Concrete

Box girder and bridge tower: No. 50 concrete

Deck leveling layer: No. 40 concrete

Pier, covered beam, main tower cap: No. 30 concrete

Deck anti-collision guardrail: No. 30 concrete

Behind-the-ear wall, corbel, plank: No. 30 concrete

Table body, tie beam, cap: concrete 25

Bored cast-in-situ pile: No. 25 underwater concrete

The quality requirements of the sand and water used for mixing concrete shall comply with the relevant provisions of the Technical Specifications for Construction of Highway Bridges and Culverts (JTJ041-2000).

3.3.2 Steel

(1) Ordinary steel bars: Grade Ⅰ and Ⅱ bars are used. The technical standards for ribbed steel bars shall comply with the provisions of "Hot-rolled ribbed steel bars for reinforced concrete" (GB1499-91), and the round steel bars shall comply with the provisions of "Hot-rolled round steel bars for reinforced concrete" (GB13013-91). Where the diameter of the reinforcing bar is ≥12mm, the hot rolled rebar of grade II (20MnSi) is used; if the diameter of the reinforcing bar is less than 12mm, the grade Ⅰ (A3) steel is used.

(2) A3 and 16Mn plates and sections are required to meet the requirements of GB709-65, and structural steels (A3 and 16Mn) are required to meet the requirements of YB166-85, YB164-63 and GB709-65.

(3) The technical standard of the prestressed steel hinge wire of the main beam shall meet the requirements of the American Standard ASTM A416-97 (Class 270), the standard strength is 1860MPa, the nominal diameter is 15.24mm, the nominal area is 140mm2, and the elastic modulus Ey = 1.95 × 105MPa, The relaxation rate is 3.5%. The OVM series anchorage and its supporting equipment are adopted, and the steel pipe is used to form a hole in the pipe, and the thickness of the steel pipe of the bellow is not less than 0.35mm.

(4) The stay cable uses the OVM cable system, a 200-level (200 MPa allowable stress range) steel strand cable, a standard strength of 1860 MPa, a standard breaking load of 1823 kN, a nominal diameter of 15.24 mm, and a nominal area of 140 mm2. The elastic modulus Ey is calculated. = 2.0 × 105MPa.

3.3.3 Bridge supports

Box girder supports are made of rubber bearings GYZ and GYZF4 series products. Its performance should meet the requirements of the transportation industry standard JT / T4-93.

3.3.4 Expansion joints

According to the use characteristics and flatness requirements of the bridge, the bridge expansion joints use D80 expansion joints.

3.3.5 Deck Pavement

The 6 ~ 13cm thick concrete leveling layer is used, and the 6cm asphalt concrete bridge deck is paved. Before paving asphalt concrete, paint a layer of triple-coated FYT-1 improved waterproof material on the bridge deck.

Chapter 4 Staffing and Material Arrangements

4.1 Main materials testing, measuring, quality inspection equipment and equipment arrival time

4.2 Staffing and mobilization cycle

4.2.1 Staffing of project department and task division of construction team

After winning the bid, our unit will be set up. The nuclear industry East China Construction Engineering Group Corporation De'an County Crossover Bridge Project Chenjiawan Bridge Project Manager Department, as our agency, the project manager department will fully perform the contract's rights and obligations on behalf of our unit, responsible for organization The project construction and external liaison and coordination work ensure that the project tasks are completed on schedule and with high quality.

The project department has 25 employees and a manager, who is responsible for the overall management of the project; a deputy manager, who is responsible for the construction and production management of the project; a chief engineer, who is responsible for the construction technology, quality control, technological innovation and application of the project, etc. Work; one security chief is responsible for the safe and civilized construction of this project. There are five departments and three rooms under the project department, namely construction technology department, safety and quality department, planning contract department, materials and equipment department, finance department, general office, test room, and health room.

4.2.2 Staffing and task division of the construction team

This project department has 7 professional engineering construction teams, namely: pile foundation construction team 1, pile foundation construction team 2, pier construction team, cast-in-situ beam construction team, precast beam construction team, pavement construction team and bridge deck paving The construction team, each construction team directly organizes the construction of the shift, and the personnel and tasks of each construction team are divided as follows:

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