On the bridge deck waterproofing layer construction quality control

[Abstract] With the construction of highway in recent years the rapid development of many new technologies, new processes, new materials have been more fully applied in the highway construction is a key point in the bridge construction is also difficult, and its construction quality control the majority of road and bridge construction enterprises has been a top priority. In this paper, the construction of the bridge deck waterproofing layer construction quality control of a preliminary analysis for the majority of the peer reference.

[Keywords] bridge deck waterproofing layer, construction, quality control

An impact on the quality of construction of bridge deck waterproofing layer factor
1.1 the performance of waterproof material.

As the construction of bridge deck waterproofing material should ensure that the following properties: ① deck coating after drying, to maintain a certain low temperature flexibility, ② the bridge can withstand long-term loads and compression requirements, ③ shear cutting ability, ④ the concrete deck to prevent water leakage caused by steel corrosion, thereby enhancing the beam's own life, ⑤ prevent structural damage caused by water seepage, slow roads and bridges of life.

1.2 cement concrete bridge deck pavement quality.

Cement concrete bridge deck waterproofing quality also affect the quality of one important factor, whether the concrete deck surface must be rough, is cleaned, it will directly affect the waterproof layer between its bond strength, thereby affecting to the deck of the bridge performance concrete and asphalt pavement surface quality.

1.3 Construction site management team.

Construction management team is also restricting the overall quality of construction, bridge construction, too, the construction site management unit determines the final bridge deck waterproofing quality of the construction unit can design drawings and design specifications in accordance with the requirements of construction works, whether in accordance with the requirements of good health after the waterproof layer construction work, will also greatly affect the waterproof layer of the quality of the construction process, due to on-site management confusion, chaos step construction workers of the water is dry layer will cause damage to the quality of the project, so be sure to pay attention to the construction team on-site management.

Construction of waterproof layer 2 bridge the technical requirements
According to design requirements for bridge deck waterproofing layer settings, the use of waterproof material should be within the validity period, stir before use, and pay attention to sealed for construction equipment used, equipment should be tested and calibrated for accuracy to meet the construction requirements before you can use in order to guarantee the quality of construction, the construction of the minimum temperature should not fall below 5 ℃. rain, fog and windy days not construction, should not be exposed when the tide of construction in late at night. Thickness should be suitable for spraying, spray evenly. Not a bubble, bubble. Can not have a flowing, accumulation or leakage jet phenomenon, the surface of each layer dry before coating the next process, the construction process is strictly prohibited arbitrary step is dry waterproofing layer, are not allowed to wear spiked shoes into the face with the construction and living with the shoes with the shoes must be strictly separated to prevent contamination deck. After construction is completed, the asphalt concrete surface layer is not pre-construction should be strictly protected against vandalism or construction damage . laying of bridge deck waterproofing layer should also note the following:
2.1 layer waterproof material should be checked in to the required standard before use,
2.2 waterproof layer by expansion joints or settlement joint, the design requirements should be laid
2.3 Cross-sectional direction of the waterproofing layer should be laid, the bottom surface should be smooth, dry, clean, reinforcing bars and can not have sharp protrusions, without moisture, water and so on,
2.4 in the construction of the bridge parapet to pay attention to, such as block, Block fence, to prevent contamination of its surface.

3 bridge deck waterproofing layer construction process should pay attention to the problem
Construction of bridge deck waterproofing layer should pay attention to the following questions; (a layer of cement concrete bridge deck flatness is poor, low-lying uneven elevation of strict control, there will result in the accumulation layer of waterproof adhesive, asphalt thickness disparities, because the asphalt layer of varying thickness, the maximum nominal aggregate size and thickness of the asphalt does not match, the normal method of rolling, compaction is difficult to guarantee (2) waterproof layer and the concrete slab deck off the air, because the surface of the concrete There are some depression can easily lead to stagnant water, accumulation of water did not break out, resulting in high temperature water vapor into and bridge deck waterproofing layer between the "mismatch." (3) bridge deck and the asphalt pavement between the bonding is essential for the bridge pavement, the addition of the adhesive layer on the bridge deck with a waterproof protection, but also has a "nexus" of the bonding role of the level of damage will lead directly to shop layer and the equipment of the separate bridge decks, pavement and bridge deck will be the loss of adhesion and withstand greater stress, and thus more likely to produce a variety of damage, if damage repair can only be "disembowelling" type construction, and can not completely cure, so the construction of the bridge deck waterproofing layer process control is particularly important.

4 bridge deck waterproofing layer construction process, quality control
4.1 Construction of a complete quality management system.

Construction of bridge deck waterproofing layer to establish a "long-term, quality first" concept, establish and improve various rules and regulations, to strengthen various aspects of the production process quality control and quality management, clear job responsibilities of the construction workers build a complete quality management system. the whole process of construction quality inspection and control, to discover and solve problems through the strict control of project quality, and fully so well-organized, system management, well construction and quality assurance. Links to free download Center http://www.hi138.com
4.2 to strengthen the quality control of raw materials.

① SBS modified asphalt supplier shall provide test reports for each batch of products, product certification, etc., ② the construction process should be strictly in accordance with the specifications of the detection frequency of batch testing admission materials, when the firm failed to effectively do materials clearance, ③ high quality SBS modified asphalt for bridge deck waterproofing layer of asphalt materials, construction quality must meet the requirements of guidance, ④ limestone aggregates used, aggregate stone must be clean, hard, sadness weathered particles, nearly cubic particles of gravel.

4.3 reasonable arrangements for quality control and construction workers.

① Construction of bridge deck waterproofing layer must arrange for the construction experience and a strong sense of responsibility for site management and technical personnel, and arrange for someone to control every aspect of the construction process, ② arrangements for quality control testing of construction engineers, to control the three aspects, the waterproof layer construction quality control, bridge inspection and for examination of concrete pavement bridge deck treatment effect, determined not to leave any quality problems, to ensure that each process in line with quality requirements.

4.4 Strengthening the construction process control.

Processed in the bridge deck surface is dry immediately after the waterproof layer. For the interval construction, must be closed to traffic, this is to prevent pollution and impact on the bridge deck waterproofing layer bonding effect, Slab, concrete bridge layer of pavement must be constructed using special equipment, quality control engineers to monitor the construction process should be strengthened, before spraying asphalt, bitumen spraying to prevent the pollution of structures, carefully check the hollowing of the bridge, the bridge there was hollowing, timely In addition to cutting and filling, and health, to conserve more than 24 hours, and strictly control the construction process to ensure the construction of bridge deck waterproofing layer of aggregate and asphalt quality and strong bond, SBS modified asphalt, asphalt aggregate spreading can be used, set materials for construction vehicles simultaneously, while using rubber tire roller rolling 2 to 3 times. for the waterproof layer of pollution, forest fire extinguishers available wire brush + cleaning + water rinse. waterproofing construction is completed, to be strictly protected from the water layer on the reverse, brakes, turn around and so on.

5 Conclusion
Construction of bridge deck waterproofing layer will directly affect the quality of operational management and the bridge traffic safety, and will result in a variety of diseases place bridge deck pavement, so the construction process must not be taken lightly. Construction unit should strengthen management of the site in strict accordance with design drawings and technical specifications of construction, review of construction experience to ensure the smooth roads and bridges.


References:
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