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CN-121976460-A - Multi-level water-resistant sealing pavement structure for bridge floor whitening disease and construction method

CN121976460ACN 121976460 ACN121976460 ACN 121976460ACN-121976460-A

Abstract

The invention relates to a multi-layer water-blocking sealing pavement structure for bridge floor whitening diseases and a construction method thereof, comprising a waterproof layer, an asphalt lower sealing layer, a homogeneous water-blocking asphalt mixture layer and an SMA-13 surface layer which are sequentially arranged on a bridge deck from bottom to top, wherein sealing materials are arranged at the joint of the bridge floor guardrail and the SMA-13 surface layer, a side drainage structure is arranged at one side of the homogeneous water-blocking asphalt mixture layer far away from the bridge floor guardrail, and the side drainage structure is close to the inside of the homogeneous water-blocking asphalt mixture layer and is positioned below the SMA-13 surface layer.

Inventors

  • GUO WEIJUN
  • LV JIAN
  • SUN ZHONGXUN
  • TONG ZHENQI
  • ZHANG QUNFENG
  • ZHANG XIAOQI
  • SI HONGSONG
  • Chen Ranming
  • WANG YIBO

Assignees

  • 浙江沪杭甬养护工程有限公司

Dates

Publication Date
20260505
Application Date
20260302

Claims (10)

  1. 1. The utility model provides a multilayer water-blocking seal pavement structure to bridge floor whitening disease, its characterized in that, includes waterproof layer (2), pitch lower seal layer (3), homogeneity close water asphalt mixture layer (4) and SMA-13 top layer (6) that set gradually on deck slab (1), deck guardrail (8) and SMA-13 top layer (6) handing-over department set up sealing material (7), one side that deck guardrail (8) was kept away from in homogeneity close water asphalt mixture layer (4) sets up lateral part drainage structure (5), lateral part drainage structure (5) are close and are located SMA-13 top layer (6) below to homogeneity close water asphalt mixture layer (4) inside, the width size of homogeneity close water asphalt mixture layer (4) is 12-15 cm.
  2. 2. The multi-level water-blocking sealing pavement structure for the bridge floor whitening disease is characterized in that the waterproof layer (2) is made of polymer modified asphalt waterproof paint, the coating rate of the waterproof layer is 0.3kg/m & lt 2 & gt, the thickness of the asphalt lower sealing layer (3) is 0.5-1.0cm, the waterproof layer is formed by mixing and paving quick-cracking emulsified asphalt and fine aggregate, the thickness of the homogeneous dense-water asphalt mixture layer (4) is 6-7cm, and the void ratio of the mixture is 3% -5% by adopting continuous graded asphalt mixture.
  3. 3. The multi-level water-blocking sealing pavement structure for bridge floor whitening disease according to claim 1, wherein the side drainage structure (5) is a geotextile inclusion structure, clean crushed stone with the particle size of 10-20mm is wrapped in the geotextile inclusion structure, and the packing compactness of the clean crushed stone is not lower than 95%.
  4. 4. A multi-level water-blocking sealing pavement structure for bridge floor whitening disease according to claim 3, wherein the thickness of the side drainage structure (5) is the same as that of the homogeneous dense water asphalt mixture layer (4), the top of the side drainage structure (5) is flush with the homogeneous dense water asphalt mixture layer (4), the bottom of the side drainage structure (5) is tightly attached to the asphalt lower sealing layer (3), and two sides of the side drainage structure (5) are smooth and straight.
  5. 5. The multi-level water-resistant sealing pavement structure for bridge floor whitening diseases according to claim 1, wherein the thickness of the SMA-13 surface layer (6) is 4-5cm, and the paving structure is formed by paving asphalt mastic broken stone mixture.
  6. 6. A construction method of a multi-level water-blocking sealing pavement structure for bridge floor whitening disease, characterized by referring to the pavement structure according to any one of claims 1 to 5, comprising: step 1, cleaning and repairing the surface of the bridge deck (1), Step 2, a waterproof layer (2) is paved on the bridge deck (1), the waterproof layer (2) is polymer modified asphalt waterproof paint, Step3, paving an asphalt lower sealing layer (3) on the waterproof layer (2), wherein the asphalt lower sealing layer (3) is formed by mixing quick-cracking emulsified asphalt and fine aggregate; step 4, paving a homogeneous dense water asphalt mixture layer (4) on the asphalt lower sealing layer (3); Step 5, arranging a side drainage structure (5) on one side of the homogeneous dense water asphalt mixture layer (4) far away from the bridge deck guardrail (8), wherein the side drainage structure (5) is positioned below the SMA-13 surface layer (6); step 6, paving an SMA-13 surface layer (6) above the homogeneous dense water asphalt mixture layer (4) and the lateral drainage structure (5); And 7, arranging a sealing material (7) at the joint of the bridge deck guardrail (8) and the SMA-13 surface layer (6).
  7. 7. The construction method of the multi-level water-blocking sealing pavement structure for bridge floor whitening disease according to claim 6, wherein the step 1 comprises the following steps: step 1.1, cleaning sundries on the surface of the bridge deck (1), Step 1.2, repairing the crack part of the bridge deck (1), wherein the surface of the repaired bridge deck (1) is flush with the original bridge deck (1), Step 1.3, performing shot blasting treatment on the surface of the bridge deck (1), And 1.4, cleaning the surface of the bridge deck (1) again to ensure the cleanliness of the surface of the bridge deck (1).
  8. 8. The construction method of the multi-level water-blocking sealing pavement structure for bridge floor whitening disease according to claim 6, wherein the step 2 comprises the following steps: step 2.1, heating the polymer modified asphalt waterproof paint, 2.2, Spraying the polymer modified asphalt waterproof paint by spraying equipment, controlling the spraying speed to be 2-3m/min, maintaining the spraying pressure to be 0.4-0.6MPa, Step 2.3, the coating is carried out on the coating missing part, And 2.4, curing after the spraying is finished.
  9. 9. The construction method of the multi-level water-blocking sealing pavement structure for bridge floor whitening disease according to claim 6, wherein the step 3 comprises the following steps: step 3.1, heating the quick-cracking emulsified asphalt and drying the fine aggregate; step 3.2, paving the quick-cracking emulsified asphalt and the fine aggregate by using a synchronous chip-breaking seal vehicle; Step 3.3, embedding the fine aggregate into emulsified asphalt through a light steel wheel road roller; And 3.4, curing after rolling.
  10. 10. The construction method of the multi-level water-blocking sealing pavement structure for bridge floor whitening disease according to claim 6, wherein the step 7 comprises the following steps: step 7.1, cleaning a joint gap between the inner side of the bridge deck guardrail (8) and the SMA-13 surface layer (6); step 7.2, adhering the masking paper on two sides of the gap, wherein the distance between the masking paper and the edge of the gap is 2-3cm; Step 7.3, injecting the sealing material (7) into the gap by adopting a special injection gun; step 7.4, scraping the surface of the sealing material (7) by adopting a special tool; and 7.5, tearing off the masking paper, cleaning the superfluous part of the surface of the sealing material (7), and naturally maintaining.

Description

Multi-level water-resistant sealing pavement structure for bridge floor whitening disease and construction method Technical Field The invention relates to the technical field of bridge engineering, in particular to a multi-level water-blocking sealing pavement structure aiming at bridge floor whitening diseases and a construction method. Background The bridge floor whitening disease is also called bridge floor flashing, is a common quality hidden trouble in asphalt bridge floor pavement engineering, and is essentially soluble alkaline substances in a cement concrete panel of the bridge floor are separated out under the action of water and are crystallized on the surface of an asphalt pavement layer, so that the white spot-shaped defect is finally formed. The damage not only affects the apparent quality of the bridge deck, but also gradually erodes the adhesive property of the asphalt mixture to cause the damage such as loosening and net cracking of a pavement layer, and further causes the water damage problems such as pit, slurry pumping and the like when serious, thereby greatly shortening the service life of the bridge deck pavement and forming a potential threat to traffic safety. On the one hand, the existing research shows that the core of the generation of bridge floor whitening disease is the synergistic effect of rainwater infiltration and dynamic water pressure, namely, road surface rainwater infiltrates to the surface of a cement concrete bridge deck through pores of a pavement layer to form retained accumulated water, the accumulated water generates high-pressure dynamic water pressure under the repeated action of vehicle load, the dissolution and migration of soluble alkaline matters in cement deck slurry are accelerated through the vacuum negative pressure suction effect, finally, the water seeps to the surface along the pores of the pavement layer, and white crystals remain after the water is evaporated. On the other hand, the junction of the inner side of the bridge deck guardrail and the paving layer is easy to form a water seepage weak point, so that the occurrence of whitening disease is further aggravated. The traditional Chinese patent application with the name of 2018271947. X is a bridge deck structural layer based on highway engineering cast-in-situ concrete bridge deck milling technology, and comprises a concrete bridge deck cast-in-situ layer, a waterproof layer and a modified asphalt concrete bridge deck pavement layer, wherein the upper layer surface of the concrete bridge deck cast-in-situ layer is provided with irregularly-shaped concrete tooth-shaped protrusions, the modified asphalt concrete bridge deck pavement layer comprises an asphalt pavement protective agent layer, an upper fine-grain asphalt concrete layer, a middle-grain asphalt concrete layer and a lower fine-grain asphalt concrete layer, the asphalt pavement protective agent layer is sprayed on the upper layer surface of the upper fine-grain asphalt concrete layer, the upper fine-grain asphalt concrete layer is paved on the middle-grain asphalt concrete layer, the middle-grain asphalt concrete layer is paved on the lower fine-grain asphalt concrete layer, and the lower fine-grain asphalt concrete layer is paved on the waterproof layer. According to the prior art, water blocking of the bottom layer is achieved only by means of a single waterproof layer, water seepage blind areas exist, meanwhile, a pavement layer does not clearly define a void ratio control index, the water seepage quantity of the surface layer is large, rainwater is easy to permeate to a cement bridge deck to form interlayer ponding, alkaline precipitation is accelerated under the action of dynamic water pressure, and a whitening disease generation path cannot be blocked from a root. The traditional Chinese patent application with the application number of 20202367864. X and the name of a bridge deck pavement composite waterproof structure comprises a sealing piece arranged between a pavement layer and a guardrail, wherein the sealing piece is embedded in a concrete layer matched with the pavement layer, one side of the concrete layer, which is close to the guardrail, is provided with a sealing groove along the length direction, the sealing piece is inserted in the sealing groove, and when the sealing piece is inserted in the sealing groove, a part of waterproof bonding layer is positioned between the sealing piece and the side wall of the sealing groove. This prior art only focuses on the guardrail and paves the side seal of layer junction, does not build the cooperation structure that blocks water of bottom layer, middle level, can't block the rainwater and permeate to the cement bridge deck from the layer inside of mating formation, also is difficult to resist the destruction of flowing water pressure to the bonding between layers, and the whole anti-whitening effect is limited. The prior application number is 202210931968.0, the name is Chinese p