Construction process for quickly and integrally replacing damaged pavement slab without suspending flights of civil aviation

Abstract

A construction process for quickly and integrally replacing a damaged pavement slab without suspending flights of civil aviation is provided according to embodiments of the present application, including: a first stage: reinforcing a foundation of a damaged pavement slab by grouting; and a second stage: integrally replacing the damaged slab with early-strength and quick-drying concrete. The construction process of fast overall replacement of a damaged pavement slab in civil aviation non-suspend construction provided by the embodiments of the present application solves the limitations of the traditional pavement slab repair process well. The present application first reinforces the damaged pavement slab foundation through grouting construction to solve the problems of slab bottom vacancy, foundation settlement, and insufficient bearing capacity of the base layer; then uses the early-strength rapid-curing concrete suitable for rapid overall slab replacement of the pavement to carry out overall replacement construction for the damaged pavement slab.

What is claimed is: 
     
         1 . A construction process for quickly and integrally replacing a damaged pavement slab without suspending flights of civil aviation, comprising:
 a first stage: reinforcing a foundation of a damaged pavement slab by grouting; and   a second stage: integrally replacing the damaged slab with early-strength and quick-drying concrete.   
     
     
         2 . The construction process according to  claim 1 , wherein the first stage comprises:
 (1) positioning of a slab to be grouted: positioning and marking the damaged slab and adjacent slabs thereof;   (2) positioning of grout holes: arranging the grout holes according to an effective diffusion radius of slurry, and shape and size of the pavement slab;   (3) drilling and blowing holes: drilling holes on the pavement to penetrate a base layer into a soil subgrade, and blowing the holes to clean dust in the holes after the drilling is completed, wherein the grouting is performed after the blowing is completed;   (4) preparing of slurry: preparing slurry while positioning the grout holes in the site;   (5) grouting: grouting the slurry into the grout holes;   (6) pressure relief and sealing holes: after the grouting is completed, pulling out a grouting tube when a grouting pressure is dissipated; and after the grouting tube is pulled out, sealing the holes with a quick-drying cement mortar;   (7) testing of grouting effect: performing HWD deflection test on the grouted reinforcement area 28 days later after the grouting is completed, to determine whether slab edge deflection/slab interior deflection<2 and slab corner deflection/slab interior deflection<3, which indicate a good status of the foundation, and if yes, performing a next stage of replacement construction; and if not, performing the above steps (1) to (6) until the test results meet the above requirements.   
     
     
         3 . The construction process according to  claim 1 , wherein the second stage comprises:
 (1) selecting of quick-drying concrete and performing of performance test: selecting a slab replacement material and performing laboratory mixing test to the selected material before construction in the site, and performing construction on a test section in the site to detect and familiarize with construction performance of the selected material;   (2) preparing of material and calibrating of a concrete mixing vehicle: before construction in the site, loading materials required for construction into corresponding silos of a concrete mixing vehicle and weighing the concrete mixing vehicle, wherein the concrete mixing vehicle has an integrated function of mixing, transporting and pouring; calibrating a metering equipment of the concrete mixing vehicle after the loading is completed, mixing a small amount of concrete for test, and determining a construction mixture ratio for the current day according to state of the concrete;   (3) entering site and positioning of slab to be replaced: determining a position where a slab is required to be quickly replaced according to design requirements;   (4) construction preparation before breaking of the slab: before breaking the slab, removing navigation aid lamps on the damaged slab, laying geotextiles on adjacent slabs, and manually trimming out edges of the damaged slab along joints of the damaged slab with an electric pick;   (5) breaking of the slab with a breaker: using breaking the damaged slab with a breaker from middle position of the slab, taking out the broken concrete blocks after the middle portion of the slab is broken, and breaking the slab toward the slab edge in turn, wherein the slab edge of the damaged slab is reserved for manual breaking;   (6) removing concrete blocks and manual cleaning: after the breaking of the damaged slab is completed, removing concrete blocks, and manually clearing up fragments at the bottom of base layer until a dense and flat base layer is obtained;   (7) Laying of geotextiles and wetting the bottom by sprinkling: after the cleaning, laying the geotextiles, and wetting the bottom by sprinkling the water;   (8) pouring a first layer of concrete with the concrete mixing vehicle in place;   (9) laying steel meshes: after pouring of the first layer of concrete is completed, installing steel meshes for reinforcement;   (10) pouring a second layer of concrete: after the installation of the reinforcement steel meshes is completed, immediately pouring a second layer of concrete in a sequence from one side of the slab to the other, and during pouring, performing processes of leveling and mud extracting on concrete surface with a double steel tube vibrating beam;   (11) exact leveling and surface finishing: after the processes of leveling and mud extracting with the double steel tube vibrating beam is completed, scraping the concrete surface with an aluminum alloy scraper, wherein cement slurry at the slab edge of adjacent slabs is cleaned up before the scraping, and during scraping, the bug holes are filled with concrete aggregate and excessive material are shoveled away with a shovel; and performing surface finishing after the scraping;   (12) Curing: carrying out a process of a water spray curing;   (13) slitting and grooving: performing processes of slitting and grooving according to performance of the quick-drying concrete used; and   (14) sealing crack and recovering maker lines.   
     
     
         4 . The process according to  claim 2 , wherein in drilling and blowing holes, a drill bit of a drilling rig used for drilling holes on the pavement is not greater than 60 mm; the drilling holes penetrates the base layer into the soil subgrade by 10 cm; after reaching a design depth, an air compressor is used to blow the holes, and the blowing time is not less than 10 s. 
     
     
         5 . The construction process according to  claim 2 , wherein technical indicators to be controlled during the grouting process comprise:
 (1). grouting pressure: when grouting on airport pavement, a grouting pressure is not greater than 1.0 MPa; when the grouting pressure is maintained at a certain value and the amount of grouting is no longer increased during the grouting, the grouting is stopped;   (2). slab surface elevation: an allowable elevation of the pavement slab during the grouting is no more than 5 mm, a final allowable elevation of the pavement slab after stabilization is not greater than 3 mm, and when the slab elevation is greater than 5 mm, the grouting is stopped; and   (3). slurry overflowing situation around the slab: the grouting is stopped when a large of slurry overflows around the pavement slab during the grouting, and the overflowing slurry is cleaned up in time.   
     
     
         6 . The construction process according to  claim 3 , wherein in the construction preparation before breaking of the slab, manually trimming out, by using an electric pick, a protective layer with a width of not less than 15 cm and a depth of not less than 10 cm along joint of the damaged slab to prevent damage to adjacent slabs when the slab is broken by a large machine. 
     
     
         7 . The construction process according to  claim 3 , wherein in the breaking of the slab with a breaker, a region with width of 15 cm at the slab edge of the damaged slab is reserved for manual breaking. 
     
     
         8 . The construction process according to  claim 3 , wherein when the thickness of a concrete slab is 40 cm, pouring thickness of the first layer is 15 cm, and the thickness of the second layer is 25 cm; the pouring of the second layer of concrete is completed before initial setting of the first layer of concrete to prevent cold joints. 
     
     
         9 . The process according to  claim 3 , wherein in pouring of concrete on two adjacent slabs at the same time, in order to prevent formation of a cold joint between the two layers when the two slabs are simultaneously poured in a layered manner, arranging a half-height molding board in middle of gap between the two adjacent slabs, wherein height of the half-height molding board is ½ of thickness of a slab; pouring concrete on the two adjacent slabs in a layered manner separately, wherein a sequence for pouring is: erecting the half-height molding board→pouring a first layer of a first slab→pouring a second layer of the first slab→removing the half-height molding board→pouring a first layer of a second slab→pouring a second layer of the second slab. 
     
     
         10 . The construction process according to  claim 3 , wherein the water spray curing comprises: when hands cannot press into concrete surface and the concrete surface starts to heat up, performing the curing by sprinkling water with a sprayer, wherein a nozzle of the sprayer faces upwards during the early of the curing so that water mist fall on the concrete surface; it is ensure that the concrete surface is moist during the curing and the curing time is not less than 3 hours.