CN101261265B - Cement concrete road surface void identification and high polymer grouting rapid servicing technology - Google Patents
Cement concrete road surface void identification and high polymer grouting rapid servicing technology Download PDFInfo
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- CN101261265B CN101261265B CN2007100540457A CN200710054045A CN101261265B CN 101261265 B CN101261265 B CN 101261265B CN 2007100540457 A CN2007100540457 A CN 2007100540457A CN 200710054045 A CN200710054045 A CN 200710054045A CN 101261265 B CN101261265 B CN 101261265B
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- 239000004568 cement Substances 0.000 title claims abstract description 36
- 229920000642 polymer Polymers 0.000 title claims abstract description 14
- 239000011800 void material Substances 0.000 title claims description 15
- 238000005516 engineering process Methods 0.000 title abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 23
- 230000000149 penetrating effect Effects 0.000 claims abstract description 15
- 238000010276 construction Methods 0.000 claims abstract description 9
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 238000007569 slipcasting Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 239000002861 polymer material Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 4
- 239000011440 grout Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 18
- 239000000463 material Substances 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000001066 destructive effect Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 201000010099 disease Diseases 0.000 description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000016507 interphase Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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Abstract
The invention discloses a cement concrete pavement detachment identification and polymer grouting fast maintenance method based on a falling weight deflectometer (FWD) and a ground penetrating radar (GPR) non-destructive test technology. The FWD and GPR are utilized to identify the detachment situation of the cement concrete pavement. Polymeric materials are injected to the pavement segment which needs detachment treatment. After the materials react, the volume quickly expands and cures, the materials fill the pavement plate bottom and base, the subbase bottom detaches, thereby reaching the purpose for fast maintenance of the cement concrete pavement detachment. The maintenance method has the advantages of speedy construction, good durability, strong pertinence and excellent waterproof performance of the injected polymeric materials, which not only saves a large amount of funds and construction periods, but also is beneficial to environmental protection and resources-saving, and provides a new advanced, efficient, economical and practical method for fast maintenance of the cement concrete pavement detachment.
Description
Technical field
The invention belongs to subgrade and pavement and detect and the maintenance technology, relate in particular to cement concrete road surface void identification and high polymer grouting rapid servicing technology.
Background technology
Since the nineties in 20th century, China's expressway construction development rapidly.Cement concrete pavement is as one of main road surface types of high-grade highway, occupies about 25% share in China.It is predicted that to the end of the year 2010, China's cement concrete pavement highway mileage will be broken through 150,000 kilometers.But it is many owing to multiple reason, many cement concrete pavements build up the needs that just can not adapt to vehicle pass-through soon, produced such as come to nothing, depression, arch upward, various breakoff phenomenons such as serious fragmentation and crack, wherein come to nothing is common and the most general disease, if untimelyly discern and punish, certainly will cause the fracture of concrete flag and the acceleration decay of road surface usability to coming to nothing.As can be seen, along with developing rapidly of cement concrete pavement, the continuous increase of mileage open to traffic detects and the maintenance management task will be heavy day by day, and is very urgent to the demand of its detection and new repairing technology.
Accurately the situation of coming to nothing is the basis of cement concrete pavement being carried out maintenance under the evaluation concrete slab.A large amount of studies show that, the situation of carrying out accurately coming to nothing under concrete slab evaluation is very difficult, and therefore the existing detection of coming to nothing needs come to nothing assessment method and theory thereof are further studied mainly based on experience and manual type.Aspect maintenance, at present, China also mainly depends on tradition decision-making mode based on experience to the maintenance of cement concrete pavement, makes maintenance be in the passive situation of " take stopgap measures " for a long time.Traditional maintenance method one is excavation type maintenance, and time-consuming, effort, cost height also are unfavorable for environmental protection; Another kind is the cement mud jacking to be carried out at the disease position handle, and this method is the main method of disease such as solve pavement depression at present, come to nothing.The ultimate principle of this method promotes for the pressure by mudjack, the material that mixes and stirs is pressed into basic unit or subbase through madjack pipe, until being penetrated into roadbed, to reach the purpose of abundant filling pore.Though it is shorter that the duration is compared in this method and the maintenance of destructive excavation type, exists the mud jacking hole bigger, road pavement has that certain infringement, mud jacking pressure are not easy to control, slurries mobile bad, deficiency such as certain curing time, the endurance quality of needs is bad.
As can be seen, existing traditional cement concrete pavement detects with the maintenance method can not satisfy busy day by day traffic needs, is badly in need of developing cement concrete road surface void identification fast and efficiently and maintenance new technology.
Along with developing rapidly of China's expressway construction, be that the Dynamic Non-Destruction Measurement of representative is subjected to increasingly extensive attention with Falling Weight Deflectometer (FWD) and ground penetrating radar (GPR).Falling Weight Deflectometer has been simulated the dynamic action of actual traffic load road pavement preferably, and it is fast to test the speed, and the precision height at home and abroad is widely used.Ground penetrating radar has obvious superiority aspect the fast detecting pavement structure layer thickness, is demonstrating wide development and application prospect aspect cement concrete road surface void identification, basic unit and roadbed defect identification, compactness and the water cut express-analysis.
Falling Weight Deflectometer utilizes hydraulic system to promote a weight, discharges the back road pavement and applies impulsive load, uses high-precision sensor and gathers road surface multiple spot flexure information, provides the foundation for further analyzing pavement structure stiffness layer and load-bearing capacity.Ground penetrating radar is by emitting antenna road pavement emission frequency electromagnetic waves, and electromagnetic wave reflects when running into the structural sheet interface, and reflected signal is by the receiving antenna collection, thereby provides the foundation for analysis road surface structare layer dielectric property and thickness, the situation of coming to nothing etc.
Research and development about high polymer grouting rapid servicing technology start to walk early to have obtained major progress the nineties, and be used widely in countries such as the U.S., Canada, Australia in the world.The subject matter that exists is that the high polymer grouting construction technology is based upon on the experiential basis always, is separated with Falling Weight Deflectometer (FWD), ground penetrating radar advanced detection techniques such as (GPR).Therefore, though the high polymer material permanance reached more than 10 years, the slip casting maintenance effect can not be guaranteed.
Above-mentioned high polymer grouting rapid servicing technology comprises superficial part injection and deep injection, and wherein the superficial part injection technique is mainly used in the come to nothing reparation and the lifting of concrete slab, and the deep injection technique is mainly used in the reinforcing of roadbed and infrastructure ground.
The high polymer grouting technology is keeped in repair sub-surface and reinforcing road bed by injection bi-component superpolymer liquid.The superpolymer liquid of injection forms solid by chemical reaction, and volume expands rapidly simultaneously, thereby fills coming to nothing in the pavement structure, and medium applies controlled pressure towards periphery.
Summary of the invention
The present invention is directed to above the deficiencies in the prior art, cement concrete road surface void identification and high polymer grouting rapid servicing technology based on Falling Weight Deflectometer (FWD), ground penetrating radar (GPR) Dynamic Non-Destruction Measurement have been proposed, set up slip casting basic parameter and Falling Weight Deflectometer and ground penetrating radar and detect correlationship between the evaluation index, for cement concrete road surface void detects and maintenance provides advanced, efficient, economic, practical a whole set of technology.
The present invention is achieved by the following technical solutions:
Cement concrete road surface void identification and high polymer grouting rapid servicing method,
(1) utilizes Falling Weight Deflectometer (FWD) and ground penetrating radar (GPR) to carry out cement concrete road surface void identification, judge the situation of coming to nothing of road deck, determine the road deck that to punish;
(2) for the concrete flag of needs punishment,, bore grouting hole with certain spacing in plate seam both sides;
(3) inject high polymer material by grouting hole down to cement concrete slab, lifting amount in road surface is controlled by control superpolymer injection rate with mudjack; After injection is finished, filling gun is withdrawn from grouting hole;
(4) punishment road surface elevation is controlled at it within 6mm error range of construction section elevation, if concrete slab length in 15m, can if length is longer, then need to monitor with laser leveler by the straight line rope control of a tension;
(5) utilize Falling Weight Deflectometer, ground penetrating radar detection technique to detect again and estimate Pavement Performance, determine slip casting effect, as meet the demands, then stop slip casting; As not meeting the demands, then need carry out after-teeming, till reaching requirement;
(6) seal up grouting hole with the thin grout of non-expansibility.
The present invention has following advantage:
1, good endurance.The high polymer material water resistance of injection is good, does not have contraction (inner volume shrank 1～3% in 10 years) substantially, and has elasticity preferably.And traditional cement mud jacking can produce drying shrinkage, and fixed back is a hard brittle material, and rupture strength is low, so permanance is relatively poor.
2, quick construction does not need health.Material is injected in back 15 minutes and is promptly formed 90% intensity, the traffic of can letting pass.
3, with strong points, controllability is good.Ravel area or weak district can be filled, be reinforced to high polymer material voluntarily in expansion process, surrounding medium pressure is depended primarily on the size of grouting amount, the control of grouting amount with adjust obviously than the control of grouting pressure with adjust more convenient.
4, the high polymer material volumetric expansion can reach 10～20 times of liquid volume, thus from heavy and light (less than consubstantiality ponding mud 10%), can as the cement mud jacking, not increase a large amount of loads to ground.
5, the high polymer grouting maintenance technique is compared with traditional method for maintaining, not only can save a large amount of funds and duration, has avoided the The Long-term Effect traffic and the bad social influence that causes, and helps protecting environment and economize on resources.
Embodiment
Embodiment: cement concrete road surface void identification of the present invention comprises following content with high polymer grouting rapid servicing technology:
The cement concrete road surface void recognition methods,
Whether have the method for coming to nothing be: measure 3 flexures under the different stage load at the same measuring point of road deck if (1) utilizing Falling Weight Deflectometer (FWD) to discern under the cement concrete slab, set up the correlationship of load and flexure, if do not come to nothing in this position, then load flexure associated straight lines process initial point or flexure y-intercept are less than 50mm, otherwise, if greater than 50mm, then can thinking, intercept comes to nothing under this point position plate;
The correlationship formula of load and flexure following (as accompanying drawing 1)
D＝aP+b
Wherein: D-central authorities deflection value, mm
The P-payload values, kPa
A is a coefficient of relationship, and b is the flexure y-intercept
(2) utilize the method for ground penetrating radar (GPR) identification cement concrete road surface void to be:
A, utilize ground penetrating radar (GPR) to detect cement concrete pavement, gather the reflected signal of radar;
The shape of b, Analysis of Radar reflection wave and time delay, anti-phase if reflected signal takes place, then this position existence is come to nothing;
C, calculate the degree of depth of coming to nothing according to mistiming of anti-phase waveform in the reflection configuration, and the character of coming to nothing in the zone that obtains coming to nothing.
Why GPR can be applied in the detection of road surface, it is the dielectric property difference of road surface different structure layer at all, thereby cause that electromagnetic wave reflects when running into the interphase of different medium, the wave amplitude of reflection wave is relevant with the dielectric property of interphase upper and lower medium, its dielectric property difference is big more, and the reflection wave wave amplitude is big more.
Coming to nothing under the Cement Concrete Pavement Slab is divided into gas and fills and come to nothing and water fills and comes to nothing two kinds, and two kinds of situation general principles are identical, but corresponding reflection configuration difference, and because the air relative dielectric constant is 1, and water is 81.So the reflection wave phase of wave that both cause is opposite, and wave amplitude varies in size.
Gas fills empty reflection wave as shown in Figure 2, and the cavity has just constituted two reflecting interfaces in two surfaces up and down: concrete-air, air-basic unit.By A, B two reflection waves as can be seen because A, the reflection coefficient that B is 2 shows that one positive one is negative, therefore causes the A point reflection anti-phase.C is the stack result of A and B, and the waveform that GPR finally obtains is C.
When the cavity is a water when filling the cavity, two reflecting interfaces of formation are: concrete-water, water-basic unit.Then reflection wave also is to fill the cavity as gas, and what obtain is the Overlay of two waveforms.
The mistiming that obtains anti-phase waveform in the overlaid waveforms by accompanying drawing 2 just can calculate the degree of depth of coming to nothing, thereby the position of coming to nothing is judged, and needing to obtain the regional character of coming to nothing of coming to nothing of processing, provides foundation for formulating rational grouting program.
Cement concrete pavement high polymer grouting rapid servicing method,
(1) utilizes Falling Weight Deflectometer (FWD) and ground penetrating radar (GPR) to carry out cement concrete road surface void identification, judge the situation of coming to nothing of road deck, determine the road deck that to punish;
(2) for the concrete flag of needs punishment,, bore grouting hole with certain spacing in plate seam both sides;
(3) inject high polymer material by grouting hole down to cement concrete slab, lifting amount in road surface is controlled by control superpolymer injection rate with mudjack; After injection is finished, filling gun is withdrawn from grouting hole;
(4) punishment road surface elevation is controlled at it within 6mm error range of construction section elevation, if concrete slab length in 15m, can if length is longer, then need to monitor with laser leveler by the straight line rope control of a tension;
(5) utilize Falling Weight Deflectometer, ground penetrating radar detection technique to detect again and estimate Pavement Performance, determine slip casting effect, as meet the demands, then stop slip casting; As not meeting the demands, then need carry out after-teeming, till reaching requirement;
(6) seal up grouting hole with the thin grout of non-expansibility.
Claims (1)
1. a cement concrete road surface void is discerned and the high polymer grouting rapid servicing method, it is characterized in that:
(1) utilizes Falling Weight Deflectometer (FWD) and ground penetrating radar (GPR) to carry out cement concrete road surface void identification, judge the situation of coming to nothing of road deck, determine the road deck that to punish;
(2) for the concrete flag of needs punishment,, bore grouting hole with certain spacing in plate seam both sides;
(3) inject high polymer material by grouting hole down to cement concrete slab, lifting amount in road surface is controlled by control superpolymer injection rate with mudjack; After injection is finished, filling gun is withdrawn from grouting hole;
(4) punishment road surface elevation is controlled at it within 6mm error range of construction section elevation, if concrete slab length in 15m, is controlled by the straight line rope of a tension, if length is longer, then needs to monitor with laser leveler;
(5) utilize Falling Weight Deflectometer, ground penetrating radar detection technique to detect again and estimate Pavement Performance, determine slip casting effect, as meet the demands, then stop slip casting; As not meeting the demands, then need carry out after-teeming, till reaching requirement;
(6) seal up grouting hole with the thin grout of non-expansibility.
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| CN2007100540457A CN101261265B (en) | 2007-03-09 | 2007-03-09 | Cement concrete road surface void identification and high polymer grouting rapid servicing technology |
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