CN100464020C - Continuously reinforced concrete road surface end portion treating method - Google Patents
Continuously reinforced concrete road surface end portion treating method Download PDFInfo
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- CN100464020C CN100464020C CNB2007100217441A CN200710021744A CN100464020C CN 100464020 C CN100464020 C CN 100464020C CN B2007100217441 A CNB2007100217441 A CN B2007100217441A CN 200710021744 A CN200710021744 A CN 200710021744A CN 100464020 C CN100464020 C CN 100464020C
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Abstract
The continuously reinforced concrete pavement end processing method is easy to treat the continuously reinforced concrete pavement end. Its special steps are as follows: 1) cutting seam and slotting. 2) Clearing preset slot. 3) Transportation and installation. 4) Welding. 5) Pouring cement concrete. 6) Embedding maurer expansion joint sealing rubber belt. With the good performance of the maurer expansion joint, it has advantages of wear resistance, antiskid, waterproof, good anti-aging performance, small vibration, no noise, long service life and easier maintenance etc.
Description
Technical field
The present invention is a kind of method that is used for concrete highway pavement end portion treatment, and especially a kind of method that more easily solves the continuously reinforced concrete road surface end portion processing belongs to the technical field that highway pavement is constructed.
Background technology
Cement concrete pavement is one of main type of Pavement Structures of High Type Highways, compares with flexible pavement, has advantages such as bearing capacity height, durable and maintenance are few, has progressively obtained promoting in China since the eighties.Concrete slab is to reduce the destruction that temperature contracts and the drying shrinkage effect causes, transverse joint and longitudinal joint need be set, seam crossing is the weak spot of cement concrete basic unit, these seams not only can increase the complexity of concrete pavement construction, and can bring many drawbacks to use, as low, the poor flatness of seam crossing load transfer ability, have a strong impact on the comfortableness of travelling, and easily produce infiltration, minister in ancient times's mud, faulting of slab ends, disease such as come to nothing, become the hidden danger of serious plant disease such as concrete slab fracture, fragmentation; Be open to traffic after a period of time, in order to recover former concrete road function of surface, sometimes on former rigid pavement, overlay asphalt concrete layer, under the effect of vehicular load and temperature load, bitumen layer directly over the seam can produce stress and concentrate, and causes that surface layer produces reflection crack when it is stressed easily during greater than its ultimate strength, and rainwater or underground water ooze to the road surface, quicken the road surface and damage in early days, threaten traffic safety; And the types of damage that this road structure type occurs is structural destruction mostly, and maintenance difficulty is big, the maintenance costs height.
In order to overcome above-mentioned common joint concrete road surface shortcoming, continuous reinforcement cement concrete pavement (CRCP) more and more is widely adopted, and has improved the road surface using character greatly, has prolonged service life of road surface; The continuous reinforcement cement concrete has stronger globality and stability, more can adapt to basic unit's condition of varying strength, and maintenance, easy to maintenance during the operation; The need that the continuous reinforcement cement concrete pavement has overcome common seam cement concrete pavement are established the shortcoming of various seams and a kind of complete and smooth road structure that adopts, on CRCP, overlay asphalt concrete layer if desired, such road structure also makes the stressed more even of asphalt surface course, be difficult for producing stress and concentrate, it is more comfortable to travel; Because the effect of arrangement of reinforcement, make that the crack width of continuous reinforcement layer of concrete is narrower, be generally less than 1mm, the crack has certain anti-shear ability under the vehicular load effect, rainwater can not infilter the erosion reinforcing bar that derusts, and has avoided producing reflection crack in Laying Asphalt Surface Course yet; The reinforcing bar of configuration has improved the load transfer ability at place, crack continuously, has improved the duty of plate angle and edges of boards, has weakened the destruction of load impact to plate, has increased the globality of road structure, has improved the supporting capacity on road surface; Because CRCP does not establish seam, good integrity has effectively stoped rainwater or underground water to infiltrate, wash away and corrode basic unit, makes the road surface have better durability.
Continuous reinforced concrete pavement is not provided with contract seam and expansion joint (E.J.) in very long distance, because ambient temperature changes expanding with heat and contract with cold in continuous reinforced concrete pavement one end generation level greatly to displacement and huge horizontal thrust of causing.So, road surface of continuous reinforced concrete pavement structure and other kind (as flexible pavement, ordinary Portland cement road surface) or bridge approach are connected and all need to do special processing, influence the stability of adjacent other road surface or works with the huge horizontal thrust that stops the continuous reinforced concrete pavement length travel to produce.Because the globality of continuous reinforcement concrete slab, plate body will shrink when environment temperature changes, if in its end without any the constraint measure, and let alone Free Transform, and will produce the displacement of 3～5cm, this will cause serious harm for structures such as being attached thereto other type road structure of connecing, bridge, culvert, therefore to select for use suitable mode to handle the end displacement of continuous reinforcement concrete slab, guarantee the continuity of road, and require method to set up simple, be easy to change.
The constraint measure of continuous reinforcement concrete slab end in the past has two classes: a class is to be completely fixed type, mainly be represented as the ground anchor beam, such processing method retrains the concrete plate end of continuous reinforcement fully, come the shrinkage stress of balance concrete slab with the passive earth pressure of clamped beam front end foundation soil, thereby the displacement of confined concrete plate end, this processing method has prevented the displacement of continuous reinforcement concrete slab end more completely, but this method designs, construction is loaded down with trivial details, long in time limit, be not easy to change; Second class is the free boundary type, mainly be represented as H beam, these class methods allow the free shrink of plate body, and cover the concrete plate end of continuous reinforcement with the top flange plate of H beam, thus the continuity of road surface driving guaranteed, but that this end portion treatment facility is that major part is positioned at is underground, maintenance if desired, then have to its road surface, top part is destroyed fully, not only decreased merit but also consuming time, have a strong impact on traffic.
Summary of the invention
Technical problem: the purpose of this invention is to provide a kind of continuously reinforced concrete road surface end portion treating method, this method more easily solves continuous reinforcement road surface end anchorage problem, and it is simple and change easy effect to have method to set up.
Technical scheme: the concrete steps of continuously reinforced concrete road surface end portion treating method of the present invention are as follows.
1.) joint-cutting fluting
A. detect on the qualified road surface finishing, the edge graticule that corresponding former reserved location draws and will slot, graticule is straight, guarantees parallelly with the shrinkage joint axis, but avoids distance between bench marks less than groove width simultaneously,
B. graticule confirm qualified after, cut asphalt concrete pavement with concrete power saw along graticule, joint-cutting is wanted neatly, and is straight, align with graticule,
C. artificial clear groove: after cutting finishes, adopt the artificial bituminous mixture in the scope of shrinkage joint of removing;
2.) seam is reserved in cleaning
D. after removing asphalt concrete pavement, can clear up foreign material in the groove, cleaning can adopt pneumatic pick that its trough inner water cement concrete and gravel are carried out fragmentation, and cleans out,
E. after cleaning out, groove inner concrete face is cut a hole hair, in the cutter hair process, prevents, guarantee the plate body functional performance the breakage of cement concrete severe,
F. after the cutter hair finishes, accurately emit plane and facade position under its projection according to the ring-like reinforcing bar position at shrinkage joint, each ring-like reinforcing bar is projected in the continuous reinforcement concrete slab end face position that is cut asphalt concrete layer and bores 2 the dark 10～15cm of being borings, clear hole dries up the back infusion epoxy resin, insert simultaneously reinforcing bar that head is " Γ " font immediately and be used for ring-like reinforcing bar welding with the shrinkage joint, after hours above-mentioned, can remove in the opposite joint, guarantee seam inner concrete cleaning surfaces, no-sundries;
3.) transportation and installation
G. the shrinkage joint is after factory is pre-assembled, and integral body transports directly to the erecting bed,
H. horizontal every 3m～5m spacing is taken and is put about a long 3m in the groove that cleans out, and the flitch of cross dimensions 10cm * 10cm is reined in seam with hair and hung on it, and whether reinforcing bar is suitable in the correspondence proving groove, and carries out necessary adjustment,
I. after hours above-mentioned, with hair rein in the seam sling, slowly put into groove, and adjust on the design attitude, the dead in line error within 1mm～2mm,
J. check the straight compliance in shrinkage joint, length direction every 1m should be no less than two checkpoints along seam, checks accurately whether shrinkage joint end face and road surface, both sides smooth-going, and principle is rather hanged down not high, error within 0mm～2mm,
K. after hours above-mentioned, it is fixing with timber wedge hair to be reined in whole pad of seam, fixing after, again its end face absolute altitude and straight compliance are checked, check finish after, can carry out the next procedure construction,
L. after above-mentioned operation finishes, from top to bottom with filling up in its shrinkage joint seam, after filling up, sealing is sealed up with adhesive tape with cystosepiment;
4.) welding
M. the seam width that when factory-assembled, locks of maurer expansion seal, be pre-determined by its requirement, welding requirements control temperature is in 15 ± 5 ℃ of scopes, exceed scope as operating condition, then remove the locking anchor clamps, adjust locator value, and lock again with special tool by its processing temperature, to guarantee the shrinkage joint installation quality
N. welding adopts the welding of symmetric points position to advance operation, and during the wall scroll welding, the welding end face welds the side more earlier, welds the bottom surface at last, guarantees welding quality, and fusion length is not less than 5cm, and the every 0.5m in shrinkage joint has at least an anchor bar to connect with embedded bar,
O. during weld job, should take safeguard measure, guarantee the cystosepiment of not burning filling, the side weld frontier inspection is looked into, after welding finishes, withdraw from a chock wedge after, check once more comprehensively,
P. after welding is fixed, in time remove the locking anchor clamps, the shrinkage joint promptly enters duty;
5.) joints cement concrete
Q. backfill part concrete adopts the C50 concrete, and concrete must be built closely knit, and planeness is in 0mm～2mm scope, and one-time-concreting, guarantees globality; The method that concrete vibrating should adopt both sides to vibrate synchronously,
R. build in the process, should avoid meeting rain, and will be necessary rainproof and the measure that intercepts water, must exempt to build finish after, the rain drop erosion of the coagulating cement regolith,
S. before the joints cement concrete,, use simultaneously on the asphalt concrete pavement of Polypropylence Sheet bedding groove both sides clearing up for the last time in the groove and cleaning,
T. the process of building is wanted continuously, and absolute altitude is controlled with the flexible pavement unanimity, prevent to exceed, and the surface is smooth, directly suitable,
U. build finish after, tightly cover more than cement concrete surface 4h～6h with Polypropylence Sheet, cover with gunnysack or geotextiles then, the watering health prevents that the water from directly watering on the watering cement concrete surface;
6.) embed the caulking gum band that hair is reined in seam
Health finishes, and behind the removing cystosepiment, sealant tape can be embedded in the seam, before the embedding, forbid that vehicle passes through its shrinkage joint.
Consider the principle of continuous reinforcement concrete slab end anchorage, the shrinkage joint of contact bridge is provided with, then the maurer expansion seal that bridge is commonly used should also can be used for the concrete plate end constraint of continuous reinforcement, do not hinder the normal use on road surface because the concrete plate end of continuous reinforcement is moved freely maurer expansion seal, the method to set up of important in addition a bit is exactly maurer expansion seal is simple and change easily.
Several continuous reinforcement concrete slab end the way of restraint in every respect parameter relatively see Table 1.
The comparison of several parameters of table 1 plate end constraint
The maurer expansion seal design principles is " rigidity anchoring " and " water-tight ".
(1) rigidity anchoring
The quality of shrinkage joint anchoring directly influences the life-span at shrinkage joint.The anchoring metal sheet mainly plays transmission power, directly is welded on the side bar through the anchor device of fatigue test, becomes beam and then is rigidly connected with the superstructure or the continuous reinforcement concrete slab of bridge.Being rigidly connected of shrinkage joint and road and bridge agent structure guaranteed that the shrinkage joint can carry maximum traffic loading.Under long-time bearing dynamic traffic load condition, other shrinkage joint is infeasible with the method that screw or bolt are connected with the road and bridge agent structure, and maurer expansion seal design has in this respect taken the lead a step.In addition, carrying and two functions of waterproof are separated, handle one by one, this is with regard to the reinforcement that helps two functions more and perfect.
(2) thorough waterproof
One of feature of maurer expansion seal is that the neoprene packing bar is embedded in the groove of side bar effectively, can guarantee thorough waterproof.Simultaneously, as long as just can on bridge floor, it be changed or it be repaired with the sulfuration method with simple tools.Under the protection of side bar, weather strip does not suffer directly rolling of wheel, and its " V " type structure can play the effect of removing silt voluntarily.Weather strip can stretching resistance, can carry out side direction and vertical displacement again.
Because the maurer expansion seal function admirable, have wear-resisting, antiskid, waterproof, ageing resistace is good, vibration is little, noiseless, long service life, advantage such as easy to maintenance.
Beneficial effect: the appropriate design to the constraint of plate end is the important prerequisite that guarantees continuous reinforcement concrete slab quantity of operation.For H beam and maurer expansion seal, its design only need calculate the free end travel of continuous reinforcement concrete slab under variation of ambient temperature, can be according to the selected model that adapts with it of this value.The design of ground anchor beam is much then complicated, not only to calculate the end displacement of continuous reinforcement concrete slab in its design process, also will according to the relevant parameter of foundation soil definitely the optimal spacing between anchor beam to give full play to the shear resistance of foundation soil, the ultimate shearing resistance of anchor beam definitely also, additional bending moment in maximal bending moment and the road slab, parameters such as shearing, determine at last the quantity of the ground anchor beam of needs setting according to the ultimate shearing resistance of anchoring beam and the relation of continuous reinforcement concrete slab temperature shrinkage stress balance, whole design process is just finished, as seen the complexity of its design.
The quality of construction quality is directly connected to the performance of properties of product, also is the most significant steps that realizes outstanding design concept.And construction quality not only depends on the construction level of unit in charge of construction, and is also relevant with the requirement of maurer expansion seal technology self.The production operation is simple, required precision is low, and the overall quality level of construction requires height naturally, otherwise then on the low side.The construction sequence of several end restraint modes is all fairly simple, is easy to grasp.But the construction precision of H beam and maurer expansion seal is had relatively high expectations, so use requires very high to straight compliance as road surface because both end faces all need.But for the composite pavement of continuous reinforcement plate+bitumen layer pattern, H beam Ying Shenyong destroys because the contraction of concrete slab can make bitumen layer drawing crack occur, and then cause the destruction of road structure under the effect of Atmospheric precipitation and vehicular load.
Product reparation or the complexity that changes are important behaviours of properties of product.For pavement engineering, product is easy to repair and then keeps in repair required time weak point, and is little to the influence of traffic, and then improves quantity of operation, reduces customer charge.The maintenance of ground anchor beam and H beam difficulty is because the major part of these two kinds of structures all underground, is keeped in repair if desired, then has to its road surface, top part is destroyed fully, has not only decreased merit but also consuming time, has a strong impact on traffic.General only need of maurer expansion seal keeped in repair rubber weather strip, and as long as just can in position it be changed or with the sulfuration method it be repaired with simple tools.
So, carrying out comprehensive examination and evaluation from design, construction, three aspects of reparation, maurer expansion seal has higher use value, and it has not only satisfied the requirement of continuous reinforcement concrete slab to end anchorage, and job practices is simple, and maintenance is easy, and cost is also not high.
The inventor has been applied to this kind continuously reinforced concrete road surface end portion New Method for Processing on Shanghai and Nanjing (Shanghai-Nanjing) speedway, Ning Huai (Nanjing-Huaian) speedway, mode of occupation is good, there is not any destruction, illustrates that it is rational that hair is reined in the design and the construction of seam.
Description of drawings
Fig. 1 is a ground anchor beam anchoring means longitudinal section schematic diagram.Wherein have: continuous reinforced concrete pavement 1, other type road surface or facility 2, expansion joint (E.J.) 3, anchoring beam 4, direction of traffic 5.
The specific embodiment
For the bituminous mixture that guarantees the both sides, shrinkage joint has enough degree of compaction, normal construction top bituminous concrete behind the layers of concrete of road surface end pre-buried good tunnel outside excises the compound of position, shrinkage joint when the shrinkage joint is installed again.The concrete steps that hair is reined in the seam installation are as follows:
1.) joint-cutting fluting
1. finish on the qualified road surface of detection, the edge graticule that corresponding former reserved location draws and will slot, graticule is straight, assurance is parallel with the shrinkage joint axis, but avoid distance between bench marks less than groove width simultaneously, for well, reason is to prevent pavement edge sedimentation and deformation in the installation process in 2～3mm scope.
2. graticule confirm qualified after, available concrete power saw cuts asphalt concrete pavement along graticule, it is neat that joint-cutting is wanted, straight, align with graticule, in the joint-cutting process, for preventing the pollution of road pavement, available manually clean contaminants at any time, but the large tracts of land water does not wash it, guarantees the operating environment cleaning.
3. artificial clear groove: after cutting finishes, adopt the artificial bituminous mixture in the scope of shrinkage joint of removing, before the cleaning, the sticking outside, application of tape shop tape edge damages in work progress to avoid the corner.
2.) seam is reserved in cleaning
1. after removing asphalt concrete pavement, can clear up foreign material in the groove, cleaning can adopt pneumatic pick that its trough inner water cement concrete and gravel are carried out fragmentation, and with manually cleaning out.
2. after cleaning out, groove inner concrete face is cut a hole hair, in the cutter hair process, prevent, guarantee the plate body functional performance the breakage of cement concrete severe.
3. after the cutter hair finishes, accurately emit plane and facade position under its projection according to the ring-like reinforcing bar position at shrinkage joint, each ring-like reinforcing bar is projected in the continuous reinforcement concrete slab end face position that is cut asphalt concrete layer and bores 2 the dark 10～15cm of being borings, clear hole dries up the back infusion epoxy resin, inserts 2 16 reinforcing bars that head is the Γ font simultaneously immediately and is used for ring-like reinforcing bar welding with the shrinkage joint.After hours above-mentioned, can remove in the opposite joint, guarantee seam inner concrete cleaning surfaces, no-sundries.
3.) transportation and installation
1. the shrinkage joint is after factory is pre-assembled, and integral body transports directly to the erecting bed, is out of shape in transportation in order not make maurer expansion seal, reduces the carrying number of times in the way as far as possible, goes into groove and should lift operation by timestamp.When depositing temporarily, be with leveling up, fill up put as much as possible, smooth.
2. horizontal every 3m～5m spacing is taken and is put about a long 3m in the groove that cleans out, and the flitch of cross dimensions 10cm * 10cm is reined in seam with hair and hung on it, and whether reinforcing bar is suitable in the correspondence proving groove, and carries out necessary adjustment.
3. after hours above-mentioned, with door frame hair is reined in seam and sling, slowly to put into groove, and adjust on the design attitude, the dead in line error is within 1mm～2mm.
4. check the straight compliance in shrinkage joint with three meters rulers, every 1m should be no less than two checkpoints along the seam length direction, checks accurately whether shrinkage joint end face and road surface, both sides be smooth-going, and principle is rather low not high, and error is within 0mm～2mm.
5. after hours above-mentioned, it is fixing with timber wedge hair to be reined in whole pad of seam.After fixing, again its end face absolute altitude and straight compliance are checked, after inspection finishes, can be carried out the next procedure construction.
6. after above-mentioned operation finishes, will fill up in the seam of its shrinkage joint from top to bottom, and after filling up, with adhesive tape sealing be sealed up and to be got final product with cystosepiment.
4.) welding
1. the seam width that when factory-assembled, locks of maurer expansion seal, be pre-determined by its requirement, welding requirements control temperature is in 15 ± 5 ℃ of scopes, exceed scope as operating condition, then remove the locking anchor clamps, adjust locator value by its processing temperature, and lock again, to guarantee the shrinkage joint installation quality with special tool.
2. high-quality welding rod is adopted in welding requirements, adopt the welding of symmetric points position to advance operation, during the wall scroll welding, the welding end face welds the side more earlier, welds the bottom surface at last, guarantee welding quality, fusion length should satisfy related standards, but is not less than 5cm, and the every 0.5m in shrinkage joint has at least an anchor bar to connect with embedded bar.Welding back section such as figure below.
3. during weld job, should take safeguard measure, guarantee the cystosepiment of not burning filling.The side weld limit checks with the 3m ruler, after welding finishes, withdraw from a chock wedge after, check once more comprehensively.
4. after welding is fixed, in time remove the locking anchor clamps, the shrinkage joint promptly enters duty.
5.) joints cement concrete
1. in order to guarantee a mao using character of reining in seam, guarantee that early disease does not appear in backfill part concrete, require backfill part concrete to adopt the C50 concrete.Before the joints cement concrete, Mix Ratio Test should meet the demands, and various tool, equipment working state are good, and weather conditions will suit simultaneously, avoids the construction at noon.Concrete must be built closely knit, smooth no honeycomb, and planeness is in 0mm～2mm scope, and one-time-concreting, guarantees globality; The method that concrete vibrating should adopt both sides to vibrate synchronously, to pulp, no longer include bubble till, guarantee vibration compacting, particularly, more should note the concrete vibration density to the place at some dead angles.
2. build in the process, should avoid meeting rain, and will be necessary rainproof and the measure that intercepts water, must exempt to build finish after, the rain drop erosion of the coagulating cement regolith.Usually the rainproof measure of intercepting water in construction is with φ 6 reinforcing bars, make semicircle arch truss by oneself and keep flat the place, shrinkage joint, width is the wide 20cm that adds of joint-cutting, length is long consistent with seam, the truss end face covers with plastic sheeting, four limits are pressed tight with brick or batten, plastic sheeting is sealed up with strip of paper used for sealing with the flexible pavement junction.
3. before the joints cement concrete,, use simultaneously on the asphalt concrete pavement of Polypropylence Sheet bedding groove both sides, prevent the pollution of road pavement in the work progress clearing up for the last time in the groove and cleaning.
4. the process of building is wanted continuously, and absolute altitude is controlled with the flexible pavement unanimity, prevent to exceed, and the surface is smooth, directly suitable.
5. build finish after, tightly cover more than cement concrete surface 4h～6h with Polypropylence Sheet, cover with gunnysack or geotextiles then, the watering health prevents that the water from directly watering on the watering cement concrete surface.Begin the construction overall process that finishes to health from joint-cutting, should under the close traffic state, carry out.
6.) embed the caulking gum band that hair is reined in seam
Health finishes, and behind the removing cystosepiment, sealant tape can be embedded in the seam, before the embedding, forbid that vehicle passes through its shrinkage joint.
7.) quality requirement
1. install the shrinkage joint and should guarantee that the superstructure energy freely stretch.
2. maurer expansion seal both sides cement concrete is smooth-going, closely knit with the flexible pavement connection, and peaceful low not high, the maximal clearance is not more than 1mm.
3. cement concrete surface should be closely knit, and is smooth, and has certain roughness.
4. both sides, shrinkage joint bituminous concrete is not damaged and is polluted.
Claims (1)
1. continuously reinforced concrete road surface end portion treating method is characterized in that the concrete steps of processing method are as follows:
1.) joint-cutting fluting
A. detect on the qualified road surface finishing, the edge graticule that corresponding former reserved location draws and will slot, graticule is straight, guarantees parallelly with the shrinkage joint axis, but avoids distance between bench marks less than groove width simultaneously,
B. graticule confirm qualified after, cut asphalt concrete pavement with concrete power saw along graticule, joint-cutting is wanted neatly, and is straight, align with graticule,
C. artificial clear groove: after cutting finishes, adopt the artificial bituminous mixture in the scope of shrinkage joint of removing;
2.) seam is reserved in cleaning
D. after removing asphalt concrete pavement, foreign material in the groove are cleared up, cleaning adopts pneumatic pick that its trough inner water cement concrete and gravel are carried out fragmentation, and cleans out,
E. after cleaning out, groove inner concrete face is cut a hole hair, in the cutter hair process, prevents, guarantee the plate body functional performance the breakage of cement concrete severe,
F. after the cutter hair finishes, accurately emit plane and facade position under its projection according to the ring-like reinforcing bar position at shrinkage joint, each ring-like reinforcing bar is projected in the continuous reinforcement concrete slab end face position that is cut asphalt concrete layer and bores 2 the dark 10～15cm of being borings, clear hole dries up the back infusion epoxy resin, insert simultaneously reinforcing bar that head is " г " font immediately and be used for ring-like reinforcing bar welding with the shrinkage joint, after hours above-mentioned, remove in the opposite joint, guarantee seam inner concrete cleaning surfaces, no-sundries;
3.) transportation and installation
G. the shrinkage joint is after factory is pre-assembled, and integral body transports directly to the erecting bed,
H. horizontal every 3m～5m spacing is taken and is put about a long 3m in the groove that cleans out, and the flitch of cross dimensions 10cm * 10cm is reined in seam with hair and hung on it, and whether reinforcing bar is suitable in the correspondence proving groove, and carries out necessary adjustment,
I. after hours above-mentioned, with hair rein in the seam sling, slowly put into groove, and adjust on the design attitude, the dead in line error within 1mm～2mm,
J. check the straight compliance in shrinkage joint, length direction every 1m should be no less than two checkpoints along seam, checks accurately whether shrinkage joint end face and road surface, both sides smooth-going, and principle is rather hanged down not high, error within 0mm～2mm,
K. after hours above-mentioned, it is fixing with timber wedge hair to be reined in whole pad of seam, fixing after, again its end face absolute altitude and straight compliance are checked, check finish after, carry out the next procedure construction,
L. after above-mentioned operation finishes, will fill up in its shrinkage joint from top to bottom, after filling up, sealing is sealed up with adhesive tape with cystosepiment;
4.) welding
M. hair is reined in the seam width that locks when being sewn on factory-assembled, be pre-determined by its requirement, welding requirements control temperature is in 15 ± 5 ℃ of scopes, exceed scope as operating condition, then remove the locking anchor clamps, adjust locator value, and lock again with special tool by its processing temperature, to guarantee the shrinkage joint installation quality
N. welding adopts the welding of symmetric points position to advance operation, and during the wall scroll welding, the welding end face welds the side more earlier, welds the bottom surface at last, guarantees welding quality, and fusion length is not less than 5cm, and the every 0.5m in shrinkage joint has at least an anchor bar to connect with embedded bar,
O. during weld job, should take safeguard measure, guarantee the cystosepiment of not burning filling, the side weld frontier inspection is looked into, after welding finishes, withdraw from a chock wedge after, check once more comprehensively,
P. after welding is fixed, in time remove the locking anchor clamps, the shrinkage joint promptly enters duty;
5.) joints cement concrete
Q. backfill part concrete adopts the C50 concrete, and concrete must be built closely knit, and planeness is in 0mm～2mm scope, and one-time-concreting, guarantees globality; The method that concrete vibrating should adopt both sides to vibrate synchronously,
R. build in the process, should avoid meeting rain, and will be necessary rainproof and the measure that intercepts water, avoid building finish after, the rain drop erosion of the coagulating cement regolith,
S. before the joints cement concrete,, use simultaneously on the asphalt concrete pavement of Polypropylence Sheet bedding groove both sides clearing up for the last time in the groove and cleaning,
T. the process of building is wanted continuously, and absolute altitude is controlled with the flexible pavement unanimity, prevent to exceed, and the surface is smooth, directly suitable,
U. build finish after, tightly cover more than cement concrete surface 4h～6h with Polypropylence Sheet, cover with gunnysack or geotextiles then, the watering health prevents that the water from directly watering on the watering cement concrete surface;
6.) embed the caulking gum band that hair is reined in seam
Health finishes, and behind the removing cystosepiment, sealant tape is embedded in the seam, before the embedding, forbids that vehicle passes through its shrinkage joint.
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| CN101666065B (en) * | 2009-03-25 | 2011-07-20 | 贵州省高等级公路管理局 | Brake plate at end of continuously reinforced cement concrete pavement |
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| CN108625263B (en) * | 2018-05-14 | 2020-11-03 | 浙江皓睿建设有限公司 | Road pavement preassembling device and using method thereof |
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| CN115992501B (en) * | 2022-12-30 | 2024-01-12 | 南方电网调峰调频发电有限公司工程建设管理分公司 | Asphalt concrete core wall dam and construction method |
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| CN101666065B (en) * | 2009-03-25 | 2011-07-20 | 贵州省高等级公路管理局 | Brake plate at end of continuously reinforced cement concrete pavement |
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| Publication number | Publication date |
|---|---|
| CN101082198A (en) | 2007-12-05 |
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