Introduction of Shanghai-Nanjing Expressway (section in Jiangsu Province) in the implementation of projects to strengthen control on engineering quality, ensure that the quality objectives and adopt “divided control unit, implementing grading responsibilities, evaluation, strengthening the process of implementing dynamic control” of specific practices. Characteristics of this approach is in the works constantly in the process of implementing the established quality objectives on prior control unit is designated for inspection and evaluation, to ensure the stability and improvement of the overall project quality. Through practice, and achieved good results, their practice for other works reference and reference.
Jiangsu section of huning Expressway is a national “85″ key projects, is also a first motorway in Jiangsu Province, the provincial party Committee and provincial government, provincial communication Department attaches great importance to the construction of this road, take it as Jiangsu “85″ during the first project, specifically to “high quality, high speed, high efficiency,” huning expressway with national quality goals of quality engineering. To this goal, the establishment of a unit system of quality assessment of invasive famous-brand product of the country project, the entire project into several evaluation, control unit, in the process of project implementation completion unit works continuously on quality assessment, on the implementation of dynamic management of engineering quality by controlling the quality of the projects for each unit, to ensure that the quality objectives of the project as a whole.
Jiangsu section of huning Expressway started on June 14, 1992, 258.46km construction total mileage, main 248.21km, Zhenjiang branch line 10.25km. across the bridge culvert blocks 431, 616 total 294 road, interchange road, channel 20, the service area 6 Office. Tender documents using standard was issued in 1985, traffic, quality evaluation standard for quality inspection and assessment of implementation of the road, traffic, JTJ071-85,1994 years of re-enactment of the new standard for quality inspection and assessment of Highway Engineering JTJ071-94, old standards in the assessment method, cell division and other major changes were made. But judging from its general spirit, the standard for dynamic control of engineering quality in construction process of adaptability is not very strong, and some important indicators such as compactness, strength of base and subbase, concrete strength evaluation method is not very clear and reasonable, module partition method for large-scale engineering quality management looked thicker, operability is not too strong. According to Shanghai-Nanjing Expressway quality management characteristics and requirements, to meet the needs of a dynamic control, refinements and adjustments were made, the development of a Shanghai-Nanjing highway engineering quality inspection and evaluation methods.
Unit 1, Evaluation Division
Reasonable division engineering quality evaluation unit, is for process quality control of Foundation and key, we under highway engineering quality inspection evaluation standard under JTJ071-94 (following short evaluation standard under) in the units engineering, and Division engineering, and min item engineering of Division principles and provisions, combination Shanghai Ning Expressway engineering of reality, for can effective control engineering quality, on all construction tender contract segment of engineering quality for examination, established has to units, and Division, and min item engineering for basic evaluation unit of unit engineering quality evaluation system, will entire Engineering Division for 300 a units engineering, more than 1400 multiple Division engineering, more than 11,000 multiple min item engineering, and established has computer secondary evaluation management system, implementation has each unit engineering of supervision, and construction responsibility people.
1.1, Division of engineering
Division to each independent unit project construction bidding based on the contract, each contract period, in accordance with the provisions of the standard of subgrade engineering, pavement engineering, bridge engineering, interchange, traffic safety facilities, housing construction division six classes. On subgrade, and pavement, and traffic security facilities, by marked segment all Division for a units engineering; on bridge engineering (in the bridge, and bridge), evaluation standard under in the is will a marked segment in the number seat large, and in the bridge hop for a units engineering, to easy construction process in the on each seat bridge of target quality for control and management, we will a marked segment in the mainline Shang of large, and in the bridge to each seat Division for a units engineering; extension Shang across bridge in evaluation standard under in the no single row for units engineering, is and bridge engineering hop for a units engineering, consider to Shang across bridge has road bridge, and people line bridge, multiple forms, and are for County, and Township Road Shang across, standard, and grade varies, and mainline bridge compared, design standard to low, so will a marked segment in the of extension Shang across bridge (regardless of several class, and several seat) merge separate Division for a units engineering;
On Interworking interchange, because Shanghai Ning Expressway Jiangsu segment along Interworking type interchange are for independent of construction tender contract, so each Interworking interchange only Division for a units engineering; on housing building, housing building units engineering of Division reference construction building installation engineering quality inspection evaluation unified standard under GBJ300-88 of Division principles for, consider to Shanghai Ning Expressway Jiangsu segment along management, and charges, and service, function sexual housing body volume little, and structure simple, duration and short, so will each Department room built (each Management Center or each charges station, and service area,) Division for a units engineering.
Division 1.2, Division of engineering
Partial Division of the engineering method of basic standards for evaluation in accordance with the principle of Division. Subgrade units engineering in the in accordance with the evaluation standard under Division for subgrade engineering, and drainage engineering, and masonry engineering, and culvert and channel, and small bridge, and large retaining wall six class division engineering, which subgrade engineering by 1~3km Division into several a Division engineering; drainage, and masonry, and culvert and channel also respectively by 1~3km Division into several a Division engineering, regardless of has several Department or several road, is 1~3km within if has 5 road culvert, only designated for a culvert Division engineering; small bridge, and large retaining wall, by each seat or each Department Division for a a Division engineering. Based on evaluation standard under of Division provisions, for easy on construction process in the of engineering quality by evaluation standard under for dynamic evaluation control, in Division Division engineering Shi to and construction plan phase combination, is to by continuous construction of paragraph or in with a period (don’t too long) construction of project to Division Division engineering, therefore various Division engineering pile, range does not necessarily relative should, from easy effective control quality departure. Pavement with 1~3km as the basic unit in the unit project divided into several partial project.
Bridge unit project, each bridge foundations and the lower (decomposition to each pier), superstructure (broken into prefabricated, installation, site placement, master and deck), the protection project, approach road works, divided into four divisions works. Roadbed of the bridge ends in the large main line, are classified as Division of subgrade engineering in the mainline bridges did not approach this Division works on the spur line across the ends of the bridge connection no matter how long, are classified as Division approach road project. Interchange unit project, broken down by two types of bridge and ramp partial engineering, bridge whether large, medium and small as a partial project to exchange the main line section also serves as a partial project within the contract.
Traffic safety facilities unit in engineering, with 1~3km as the basic unit, a unit of engineering sign or road marking, fence, fence and lighting facilities, emergency call by 1~3km Engineering Division divided into several. Housing building units engineering in the, by housing main Division housing building Division engineering; by indoor outside gas supply, and to drainage Division gas supply, and to drainage Division engineering; by indoor, and outside power, Division electrical installation Division engineering, by field road, and car park, and green, and wall, Division outdoor Division engineering; by charges ceiling, and charges square, and charges Island, Division charges ceiling, and charges square engineering, a Department all housing of similar project by above principles merge designated for a a Division engineering.
1.3, sub division of the project
Project is divided in accordance with the provisions of the standard. Divided on some project, from the perspective of strengthening quality control and ease of management, have made some additions or adjustments.
1.3.1, asphalt concrete pavement construction in Jiangsu section of huning Expressway asphalt concrete pavement is divided into upper, middle and lower-layer, only the upper layer in the standard of evaluation standards, although in thickness in this indicator on total thickness is required, but to, the following quality assessment indicators is unclear. In order to ensure the quality of, the following layer, we will, 1~3km layer below is divided into sub projects, setting standards for acceptance and assessment.
1.3.2, and asphalt concrete deck, and bridge Shang waveform beam guardrail, and marking divide item engineering because bridge Shang of asphalt concrete deck, and waveform beam guardrail, and marking, are not bridge construction units construction, its engineering content also not full containing in bridge of tender contract in the, consider to if will pavement, and traffic security facilities units construction of deck or guardrail, and marking, from its overall in the draw part, into bridge engineering in the to evaluation is not reasonable of, so no will its owned into bridge engineering in the, but respectively owned into pavement engineering and traffic security facilities engineering in the.
1.3.3, building engineering
According to the Ministry of construction of the construction and installation standard for quality inspection and assessment of the GBJ300-88, to assess the main sub-item project. Housing building Division engineering by containing min item has: Foundation, and Foundation, and main engineering in the of reinforced, and concrete widget installation (floor), and masonry brick engineering, and ground, and doors and Windows installation, and roof, and decoration; gas supply, and to drainage Division engineering by containing min item has: indoor (outdoor) to drainage pipeline installation, and indoor (outdoor) drainage pipeline installation, and boiler installation, and outdoor heating pipeline installation; electrical installation Division engineering by containing min item has: cable line, and electrical lighting apparatus and the distribution box installation, and electrical transformer installation, and sets distribution cabinet (disc) and the power switch installation; outdoor Division engineering by containing min item has: field road, and car park, and green, and wall; charges ceiling, and charges square Division engineering by containing min item has: roof truss installation, and roof installation, and charges Pavilion installation, and charges square (including charges Island).
2, a range of evaluation and control of project quality
Evaluation standards and quality objectives for quality level
Cell engineering, traffic inspection and evaluation standards issued on October 1, 1994 the highway engineering quality inspection and evaluation standards JTJ071-94, for engineering quality inspection of the completed before October 1, 1994, according to the JTJ071-85 standard, but should score for score calculation and assessment in accordance with JTJ071-94, which increases the quality assurance inspection and evaluation of the information. Unified sub-item engineering of score calculation method of the test of “composite score measured item = score look-demerit points-quality information” provisions. Division of engineering and engineering using weighted average value calculation method to determine the corresponding score value.