What are the main problems of highway engineering quality?How to classify

At this stage, what is the common problem of the quality of subgrade engineering in China?What are the main quality problems?The following is the relevant content of Zhongda Consulting's combing of professional construction terminology for common problems in the quality of subgrade engineering, and the basic situation is as follows:

The roadbed refers to the strip structure built as the foundation of the road surface in accordance with the location of the route and certain technical requirements, which is the foundation of the railway and highway, and the roadbed is a linear structure built with soil or stone. The roadbed is built under good geological, hydrological and climatic conditions. In terms of materials, the roadbed can be divided into three types: dirt roadbed, stone roadbed, and earth and stone roadbed.

At this stage, in the construction process, the construction enterprises mainly encounter the common problems of subgrade engineering quality, including: (1) the subgrade rolling appears "spring" (2) the subgrade compaction is not enough (3) the subgrade water accumulation is serious (4) the subgrade slope is washed out (5) the surface of the compacted layer is loose and other related content, the specific measures are as follows

First, the roadbed rolling appears "spring".

Causes of formation:1The water content of the soil during rolling exceeds the optimal water content by a large amount.

2.The "sanding" of high-plastic quietly sensitive cohesive soil did not achieve the desired effect.

3.Turning and mixing are uneven.

4.There is a weak layer under the rolling layer.

Prevention and control measures: 1The soil with low plasticity and high water content should be turned over to the specified water content before it can be rolled.

2.The highly plastic cohesive soil is difficult to crush, so it should be mixed twice and stored for a period of time to make it fully "sanded".

3.The part that produces the "spring" is dug and mixed with ash and then re-rolled.

Second, the reason for the formation of insufficient compaction of the subgrade:

1.The number of crushing passes is not enough.

2.The mass of the roller is on the low side.

3.The thickness of the loose paving is too large.

4.The rolling is uneven, and the pressure leaks locally.

5.The water content deviates from the optimal water content and exceeds the specified value.

Prevention and control measures: 1Ensure that the quality of the roller and the number of rolling passes meet the regulations.

2.The vibrating roller is used to cooperate with the three-wheel roller to ensure uniform rolling.

3.The roller should advance and retreat in an orderly manner, and there should be overlap between the front and back.

4.The subgrade soil should be rolled when it is close to the optimal water content.

Third, the roadbed is seriously waterlogged.

Causes of formation:1The surface of the roadbed is uneven.

2.There is no cross slope or reverse slope on the surface of the roadbed.

Prevention and control measures: 1The roadbed should be leveled before compaction.

2.The surface of the roadbed should be set with a cross slope of 2% and 4%.

Fourth, the roadbed slope is washed.

Causes of formation:1Premature slope cutting and slope protection works failed to keep up in time.

2.There are no temporary rapids and rams.

3.The roadbed was not repaired in time after each rainwater wash.

4.The slope is not protected by grass.

Preventive measures:1After the slope is cut, the slope protection project should keep up in time.

2.Temporary rapids and stalks and drainage ditches should be provided.

3.The ditch should be filled in time.

Fifth, the surface of the compacted layer is loose.

Causes of formation:1The construction section is long, and the mixing, crushing, and compacting equipment is insufficient.

2.After crushing and mixing, the surface layer is not rolled in time and loses too much water.

3.The water content of the compacted layer soil is too much lower than the optimal water content.

Prevention and control measures: 1Ensure that the difference between the moisture content of the compacted layer soil and the optimal moisture content is within the specified range.

2.After proper sprinkling, mix and roll again.

<> project quality problems often occur during the construction process and are difficult to complete due to negligent management. The key to the prevention and control of common problems in construction quality is to improve the level of construction technology, and at the same time, the management of the construction site should be strengthened. Today, let's take a look at what is the common problem of engineering quality with the bidding network?

What are the common quality problems in construction engineering?

What are the common problems of engineering quality?

It refers to all kinds of common quality damage that affects the engineering structure, use function and appearance perception, just like "frequent disease", and is called a common quality problem.

What are the common quality problems in construction engineering?

Concrete engineering exposed ribs, displacement of embedded travel parts, honeycomb, hemp surface, holes, slag inclusions, missing edges and corners on the concrete surface; Concrete dry shrinkage cracks, temperature cracks, uneven subsidence cracks, ......

Plastering project hollowing, cracks, uneven surface, yin and yang angles are not vertical, not square, obvious joints, and ...... plastering marks

Masonry engineering axis displacement, chaotic assembly, brick joint mortar is not full, wall retention shade, poor joints, missing or rusting tie ribs... …

How to eliminate the common problems of project quality?

In order to eliminate the common problems of construction quality of the company's construction and installation projects under construction, promote the improvement of project quality and enterprise management level, and meet customer needs and expectations. Comprehensively considering the main factors affecting the quality of the project, "man, machine, material, method, environment, and measurement", in the process of project management, we should focus on the supervision of the division (sub-division) and sub-project (sub-division) that are prone to common quality problems, and take effective preventive measures from the aspects of design deepening, raw material control, construction process, equipment use and maintenance, etc., and take effective preventive measures, fully participate in management, and carry out total quality management.