Common hidden dangers of road and bridge engineering and construction treatment technology?

What are the common hidden dangers in road and bridge engineering? What is the construction treatment technology? Please read the article edited by Zhong Da Consulting Company.

Common hidden dangers in road and bridge engineering are important factors affecting the safety and service life of road and bridge facilities. On the basis of in-depth analysis of the common hidden dangers in current road and bridge engineering and their causes, the corresponding construction treatment technologies are discussed, so as to improve the benefit of road and bridge engineering.

As an important infrastructure of urban development, the construction quality of road bridges is not only a key factor affecting the service life of road bridges, but also an important factor affecting the economic development of cities and the planning benefits of transportation networks. In recent years, with the continuous development of urbanization and the in-depth innovation of road and bridge engineering construction technology, although the construction quality of road and bridge engineering has made great progress, there are still some structural diseases and functional diseases, which pose a serious threat to the engineering benefit. Based on the author's working practice, this paper analyzes the common hidden dangers and causes of road and bridge engineering at present, and discusses the corresponding construction treatment technology to improve the benefit of road and bridge engineering.

First, the common hidden dangers of road and bridge engineering and related reasons

1, uneven settlement of road and bridge foundation

Differential settlement of road and bridge foundation is a common problem in road and bridge engineering, especially soft soil foundation has obvious characteristics such as large void ratio, high water content and strong fluidity. If effective measures are not taken in the construction, it will easily lead to insufficient compaction degree of subgrade, which does not meet the requirements of road engineering compaction degree. Once influenced by factors such as heavy traffic load, it is easy to lead to the hidden danger of uneven settlement of foundation, resulting in cracks in roads and bridge decks. On the one hand, it is related to the inadequate investigation and design work in the early stage of the project, and on the other hand, it is caused by unscientific factors in the construction and treatment technology of soft foundation.

2. Concrete cracks.

As the main material of road and bridge construction, concrete has become the most widely used building material because of its obvious advantages such as low price, wide range of materials, high compressive strength and good fire resistance, but at the same time, the hidden dangers of concrete tensile strength and easy cracking occur from time to time, which has become an important factor affecting the quality of road and bridge construction. At present, the main causes of concrete cracks in road and bridge construction projects are: (1) cracks caused by temperature changes; (2) Cracks caused by foundation deformation; (3) Cracks caused by rebar corrosion.

3, road and bridge stability and reliability decline.

During the long-term use of road and bridge facilities, with the damage of natural environment and use environment to beam materials, components and structures, such as diseases and aging of beam structures, over-limit transportation of vehicles, accidental collision, etc., it will inevitably lead to the deterioration of bridge performance, the decline of bearing capacity and durability, and the decline of overall and local stiffness of road and bridge structures, further affecting its stability and reliability and restricting its normal use.

Second, the construction treatment technology of common hidden dangers in road and bridge engineering

In view of the common hidden dangers of road and bridge engineering, reasonable and effective construction treatment technology should be adopted in time to solve the diseases, improve the safety performance and service life of bridge facilities, and then promote the improvement of economic and social benefits of road and bridge construction engineering.

1, soft soil foundation construction treatment technology

In the early stage of road and bridge construction, we should make full preparations for on-site investigation and evaluation, carefully analyze the distribution characteristics of soft soil foundation in the construction area and the causes and depth of soft soil formation, and accurately understand the uniformity, settlement, bearing capacity and sensitivity of soft soil foundation through exploration methods such as drilling exploration, in-situ testing and indoor geotechnical testing, so as to provide as much information as possible for later construction treatment. In the later stage of construction, we should optimize the scientific construction technology based on the data obtained in the previous exploration, the advantages and disadvantages of various soft soil foundation treatment technologies, and the comprehensive analysis of various impression factors such as construction period, equipment layout and material engineering.

(1) Grouting treatment technology, that is, silicate, cement mortar, cement slurry and other grout are injected into foundation cracks by high-pressure rotary spraying method and powder spraying method to improve the properties of soft soil foundation and further promote the consolidation settlement and stability of soft soil foundation; (2) Dynamic compaction is the most widely used construction technology in soft soil foundation treatment scheme at present, and its main working principle is to impact soft soil foundation with the help of the gravity of heavy hammer, thus strengthening the foundation. (3) Drainage consolidation treatment technology, that is, with the help of the load of the foundation itself, the pore water in the soil is gradually discharged through vertically arranged drainage wells, manholes or plastic drainage bags to promote the consolidation of the foundation. The main technical schemes are manhole method, bagged manhole method and sand cushion method.

2, concrete crack repair construction technology

The causes of concrete cracks are complicated, so reasonable construction technology should be selected according to the nature, distribution and characteristics of cracks in concrete repair construction practice to improve construction quality. Construction technology of (1) surface repair. It is suitable for treating shallow cracks on the surface and deep cracks whose depth does not reach the surface of steel bars, that is, after the attachments on the concrete surface are removed, the cracks are first smeared with epoxy glue or cement slurry, then smeared with materials with good anticorrosion performance such as paint and asphalt, and finally the cracks are pasted or covered with glass fiber cloth to prevent the cracks from expanding further.

(2) Filling and repairing construction technology. It is suitable for large cracks with a width greater than 0.3mm, that is, after the dust and free lime on the concrete surface are removed, epoxy resin with adhesiveness and permeability is injected into the cracks under pressure to fill and plug them, so as to prevent the corrosion of steel bars and the aging of concrete. (3) Construction technology of structural reinforcement. It is suitable for cracks caused by long-term overload and durability reduction of bridges, including anchorage reinforcement method and prestress reinforcement method.

3, beam structure reinforcement construction technology

Strengthening the original stress structure of road and bridge is an important measure to enhance the safety of road and bridge, prolong the service life of road and bridge and improve the engineering benefit. The main construction techniques include (:1) bridge deck reinforcement layer reinforcement technology, that is, laying a reinforced concrete layer above the top of the beam to improve the compressive strength of the main beam and promote the improvement of the bearing capacity of the beam; (2) Strengthening technology, that is, increasing the size of beam bottom and the number of main reinforcement, to promote the improvement of bridge bending strength and bearing capacity.

(3) Bolt-shotcrete reinforcement technology, that is, under the action of high-speed spraying machinery, fresh concrete is continuously sprayed on the spraying surface to form reinforced concrete, so as to promote the overall stability of the beam structure; (4) Changing the reinforcement technology of the structural stress system, that is, adding piers or bearings under the simply supported beams; Or simply supported beams are longitudinally connected to form a continuous beam; Or adding composite beams under the beams. Change the stress system of the beam structure and enhance the bearing capacity of the bridge.

Third, summary.

With the rapid development of China's national economy and transportation, China's bridge construction project has made great progress; However, in view of the common hidden dangers in engineering, timely and reasonable construction treatment technology should be adopted on the basis of in-depth analysis of the causes of diseases, so as to improve the quality and safety performance of road and bridge infrastructure and maximize the benefits of engineering construction.

The above are collected and sorted by Zhong Da Consulting Company.

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