CN105239483A - Wharf concrete road structure and construction method thereof - Google Patents
Wharf concrete road structure and construction method thereof Download PDFInfo
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- CN105239483A CN105239483A CN201510756271.4A CN201510756271A CN105239483A CN 105239483 A CN105239483 A CN 105239483A CN 201510756271 A CN201510756271 A CN 201510756271A CN 105239483 A CN105239483 A CN 105239483A
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Abstract
The invention discloses a wharf concrete road structure. A cushion layer, a base layer and a surface layer are laid on the upper surface of a roadbed, and transverse and longitudinal distribution steel bars are arranged on the upper portion of the surface layer. A road is divided into two lanes from the center, the surface layer with the two lanes is divided into a plurality of concrete cast-in-situ traffic lane plates, and force transfer rods are arranged in longitudinal joints and transverse joints between the traffic lane plates. The traffic lane plates are divided into wheel pressure areas and non-wheel-pressure areas. Crush-resistance steel bars are distributed on the upper edges of the wheel pressure areas, bending-resistance steel bars are distributed on the lower edges of the wheel pressure areas, and longitudinal steel bars are arranged in the middle parts of the two sides of each wheel pressure area. Tie bars are arranged between the crush-resistance steel bars and the bending-resistance steel bars. Stirrups are arranged outside the crush-resistance steel bars, the bending-resistance steel bars and the middle longitudinal steel bars. Non-wheel-pressure area identifications and wheel pressure area identifications are arranged on the surface of the surface layer. After the roadbed, the cushion layer, the base layer and the surface layer are constructed in sequence, joint cutting and joint filling are conducted, and identification marked lines are drawn. According to the road, by the adoption of the identification marked lines, vehicles can be guided to travel along the wheel pressure areas with high bending resistance and cracking resistance bearing capacity, the road can bear container vehicle loads which are heavy in traffic and heavy in axle load, and therefore the safety and durability of the surface layer are guaranteed.
Description
Technical field
The present invention relates to highway construction, particularly a kind of harbour concrete road line structure for container heavy-duty freight car traveling and construction method thereof.
Background technology
No matter be passenger vehicle or lorry, the total weight of vehicle body is all pass to road surface by the wheel on axletree.Therefore, for road surface, the axle attaching great importance to automobile carries.At present, the rear axle axle of the lorry that highway in China travels carries, and general control is within the scope of 60 ~ 130kN, and China's current highway and urban road surfaces design specifications take 100kN as design of standard axle load.
It is different that the axle of different gravity carries the degree of injury brought to road structure, and road structure designs, and except will considering the accumulative traffic volume of road in design period, also must consider that axle at different levels carries proportion.
Harbour is the distribution centre of sea-freight or river cargo handling, a large amount of container (container vehicle gross weight is mostly more than 40 tons) and heavy goods vehicle ceaselessly come and go and convey goods, the main harbour concrete road travelled for this kind of lorry, general employing concrete road line structure at present: lay bed course, basic unit and surface layer respectively on roadbed, add transversely distributed steelbar and genesis analysis reinforcing bar in the concrete of surface layer.This concrete road line structure, because the accumulative traffic volume is large, vehicle axle is heavy and the total reason such as great, its safety and durability are difficult to be guaranteed.
Summary of the invention
The object of this invention is to provide the harbour concrete road line structure of a kind of safety and good endurance, the construction method of this structure is provided simultaneously.
Harbour concrete road line structure provided by the invention, lays bed course, basic unit and surface layer respectively on roadbed; The thickness of surface layer, basic unit and bed course is respectively 30cm, 45cm and 25cm; Transversely distributed steelbar and genesis analysis reinforcing bar is furnished with on the top of surface layer; This harbour concrete road curb wherein heart line is divided into No. 1 track and Liang Ge track, No. 2 tracks; The surface layer in two tracks is divided into some pieces of carriageway plates by longitudinal length 400 ~ 600cm, transverse width 400 ~ 500cm, is equipped with dowel bar in the transverse joint of carriageway plate and longitudinal joint; Two tracks are divided into wheel nip and non-ly take turns nip, the compression reinforcement of laterally spaced 25cm is furnished with at the upper limb of wheel nip, the bending resistance reinforcing bar of laterally spaced 12.5cm is furnished with at the lower edge of wheel nip, middle part longitudinal reinforcement is had respectively at two middle side parts of wheel nip, between compression reinforcement and bending resistance reinforcing bar, have lacing wire, there is stirrup the outside of compression reinforcement, bending resistance reinforcing bar and middle part longitudinal reinforcement; There is non-nip of taking turns to identify and wheel nip mark on the surface of surface layer.
The hot rolled ribbed steel bar that described compression reinforcement is diameter 12 ~ 16mm, length is less than carriageway plate longitudinal length 4cm.
The hot rolled ribbed steel bar that described bending resistance reinforcing bar is diameter 22 ~ 28mm, length is less than carriageway plate longitudinal length 4cm.
The hot rolled ribbed steel bar that described middle part longitudinal reinforcement is diameter is 12 ~ 16mm, length is less than carriageway plate longitudinal length 4cm.
Described stirrup is the hot rolled ribbed steel bar of diameter 12mm, and within the scope of carriageway plate distance two distance dual-side 50 ~ 70cm, stirrup spacing is 12.5cm, and within the scope of all the other, stirrup spacing is 25cm.
Described lacing wire is the hot rolled ribbed steel bar of diameter 12mm, and longitudinal mutual spacing is 25cm.
Described transversely distributed steelbar and genesis analysis reinforcing bar are respectively the hot rolled ribbed steel bar of diameter 12mm, and transversely distributed steelbar mutual spacing is 10 ~ 15cm, and genesis analysis reinforcing bar is that 10 ~ 15cm is arranged in non-wheel within the scope of nip by spacing.
Described dowel bar is the hot calendering round bar of diameter 32mm, long 50cm, mutual spacing 30cm.
The construction method of above-mentioned road structure, comprises the step of following order:
Step one, roadbed are constructed
The thick element soil of 30cm is backfilled after clear table; Implement 20 times impact-rollings, rolling speed is 10 ~ 15km/h; Make the comprehensive modulus of resilience value E of the end face resistance to compression of roadbed
ocreach 80kPa ~ 120kPa;
Step 2, cushion construction
1) material requirements
Select high-quality gravel or be aggregate with the clean rubble of building stones fragmentation, the building stones standard class selected is not less than three grades; The granule content that in aggregate, particle diameter is less than 0.075mm is less than 3%, and should have enough transmission coefficients;
2) construction requirement
Natural mixing gravel or not sieved rubble, can direct decking and rolling, can pave after the material lorry mounted mixer uniform mixing that classification prepares; Employing machine spreading, should avoid segregation in paving process, and for the position locally occurring to emanate, ensure its uniformity by supplementing the mode of mixing and stirring, that seriously emanates answers partial refuelling; Bed course after paving must have the initial compactness of suitable road camber and uniformity, to ensure consolidation effect; The qualified standard of compacting is that the vibratory roller of deadweight 12 ~ 15 tons rolls under 20 ~ 25 tons of exciting forces, and surface is without obviously passing and wheelmark;
Step 3, base layer construction
1) basic unit is made up of 5% cement stabilized grading crushed stones, and cement stabilizing compound mixes and stirs and adopts mechanical mixing method;
2) must check the water content controlling blended stock and the uniformity of mixing and stirring before rolling, should roll when blended stock is in optimal compaction water content, each compacted depth is minimum is 5cm, is 15cm to the maximum;
3) to note levelling in roller compaction process, fill up place and want scarifying reinforced, be again compacted into entirety;
4) cement stabilizing compound is from the time delay (comprising the dry mixing time) adding cement and mixed and stirred compacting, should more than 2 hours;
5) after roller-compaction, every day, watering carried out maintenance for several times, kept substrate surface to soak, and forbade spilling with water pipe punching, and curing time must not be less than 7 days, makes the comprehensive modulus of resilience value E of the end face resistance to compression of basic unit
ojreach 1500kPa ~ 1550kPa; Should immediately to surface construction after maintenance terminates
Step 4, surface construction
1) colligation is positioned to the transversely distributed steelbar in surface layer structure, genesis analysis reinforcing bar, compression reinforcement, bending resistance reinforcing bar, lacing wire and stirrup; Bury dowel bar underground;
2) after-pouring concrete buried underground by the location colligation and the dowel bar that complete above-mentioned reinforcing bar, during spread concrete compound, stops sinking to the duration of vibrating of each position compound, no longer emits bubble and till glowing cement mortar, stop vibrating with compound; Jolt ramming and roughly shake flat after, come and go to scrape with vibrations tamping plate and shake 2 ~ 3 times, by surperficial bleeding leveling, drive bubble out of, and excavation and filling polishing in time, select thinner macadam-aggregate mix when filling up, forbid to fill up levelling with sharp sand slurry; Forbid when wiping one's face sprinkle water on concrete slab and spill cement flour; The floating rear employing kerve device in surface or rolling embossing device transversely make texture at concrete surface; Plucking or the embossing degree of depth are 1 ~ 3mm;
3) health
Should start health immediately after concrete surface making completes, health overburden moisturizing also watering in time, keeps concrete surface to be in dampness all the time, during temperature 5 ~ 40 DEG C, conditioned time is no less than 28 days, and when temperature is less than 5 DEG C, conditioned time is no less than 60 days;
Step 5, joint-cutting and joint filling
Joint-cutting method is adopted to carry out joint-cutting to the longitudinal joint of carriageway plate and transverse joint, when concrete strength reaches 25% ~ 30% of design strength, with joint cutter cutting, depth of cut 2 ~ 3cm;
Slot should in the expired rear joint filling in time of concrete curing; Must keep clean in seam before joint filling, ensure that pointing should adhere to concrete slotted wall simultaneously and closely do not seep water, should ensure that before open to traffic pointing has the sufficient scleroma time;
Step 6, the surface rendering of surface layer non-take turns nip mark and wheel nip mark.
The harbour concrete road built up by above-mentioned construction method has following beneficial effect:
1, adopt high-modulus roadbed, bed course and basic unit, one is to effectively reduce surface layer deflection value distortion under heavy loads, greatly can improve the concrete slab durability of surface layer; Two is make the whole plate thickness of panel even, and the temperature difference greatly reduces with the tired tensile stress of wet difference, improves the fatigue resistance of road structure; Three is that the joint slab ability of concrete slab is significantly improved, and is convenient to late maintaining and improves the life cycle on road surface.
2, by mark graticule, container vehicle is guided to the wheel nip traveling of regulation, and in the surface layer of wheel nip, configure bending resistance reinforcing bar and compression reinforcement pointedly, improve the bending resistance of wheel nip, cracking resistance supporting capacity; The concrete of wheel nip scope can retrain by stirrup and lacing wire, improves concrete tension, compressive property; Thus enable the surface layer of wheel nip bear the container vehicle load of heavy traffic, axle load, ensure safety and the durability of surface layer.
3, stirrup presses 12.5cm pitch arrangement at carriageway plate within the scope of the 50 ~ 70cm of two ends, encrypts, ensure that the bending resistance at carriageway plate two ends, the supporting capacity of cracking resistance.
4, in the stressed weak location of carriageway plate side, by mark graticule container vehicle guided to the driving path of regulation, avoids the side that container vehicle wheel acts on carriageway plate, avoid stressed on unfavorable factor; Take turns nip by division is non-simultaneously, conveniently configure arrangement of reinforcement at non-nip of taking turns, be conducive to saving construction costs.
5, mark adopts high reflect type graticule greatly can improve the safety of driving at night, also can improve driving at night efficiency simultaneously.
6, structure site operation is easy, convenient later maintenance.
Accompanying drawing explanation
Accompanying drawing provides the schematic diagram of the embodiment of the present invention, wherein:
Fig. 1 is the sectional schematic diagram of harbour concrete road;
Fig. 2 is surface layer upper level direction sectional view in Fig. 1;
Fig. 3 is the driving marked graph in Fig. 1 on facing surface;
Fig. 4 is for vehicle is along the road driving schematic diagram identified shown in Fig. 3;
Fig. 5 is the arrangement of reinforcement of surface course.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described.
The present embodiment harbour concrete road line structure, as shown in Figure 1, on roadbed 4, lay 25cm hassock layer 3, the thick basic unit of 45cm 2 and the thick surface layer 1 of 30cm respectively, the overall width of road is 850cm.
As shown in Figure 2, this concrete is along road, and be divided into two tracks of width 425cm along its center line, wherein No. 1 track I is track of stocking up, and No. 2 tracks II are return track.The surface layer 1 in two tracks by longitudinal length (length along road longitudinal direction) be 450cm, transverse width (length along road transverse direction) is divided into the cast-in-place carriageway plate 5 of some block concretes for 425cm, at longitudinal joint 6-1 (gap between longitudinal along road) and transverse joint 6-2 (gap between horizontal along road) the mid-dowel bar 7 of carriageway plate, dowel bar is the hot calendering round bar HPB300 of diameter 32mm, long 50cm, mutual spacing 30cm.
As shown in Figure 3, two tracks are divided into wheel nip 9-1 and non-ly take turns nip 9-2.On each track, the width of two wheel nip 9-1 is 100cm, mutual spacing 80cm, and foreign steamer nip is 72.5cm apart from the distance of track outer side edges, takes turns nip 9-2 beyond wheel nip for non-.
As shown in Figure 5, be furnished with the hot rolled ribbed steel bar HRB400 of 5 diameter 12 ~ 16mm, length 446cm, spaced 25cm at the upper limb of wheel nip 9-1, form horizontal compression reinforcement 11; The hot rolled ribbed steel bar HRB400 of 10 diameter 2 ~ 28mm, length 446cm, spaced 12.5cm is furnished with, composition bending resistance reinforcing bar 10 at the lower edge of wheel nip 9-1; There is the hot rolled ribbed steel bar HRB400 of 1 diameter 12 ~ 16mm, length 446cm at the middle part of wheel nip both sides respectively, form middle part longitudinal reinforcement 12; Between compression reinforcement and bending resistance reinforcing bar, there is the hot rolled ribbed steel bar HRB400 of diameter 12mm, longitudinal mutual spacing 25cm, form lacing wire 14; Stirrup 13 is had in the outside of compression reinforcement, bending resistance reinforcing bar and middle part longitudinal reinforcement, within the scope of carriageway plate longitudinally distance dual-side 50 ~ 70cm, stirrup spacing is 12.5cm, within the scope of all the other, stirrup spacing is 25cm, and stirrup is the hot rolled ribbed steel bar HRB400 of diameter 12mm.The top of taking turns nip 9-2 non-, be furnished with diameter 12mm apart from surperficial 10cm place, transversely distributed steelbar 15 that the hot rolled ribbed steel bar HRB400 of mutual spacing 15cm is formed and diameter 12mm, along road longitudinally carriageway plate apart from mutual spacing 12.5cm within the scope of the 50 ~ 70cm of two ends, within the scope of all the other mutually apart between the genesis analysis reinforcing bar 16 that forms of the hot rolled ribbed steel bar RB400 of 15cm.The non-nip mark 8-2 that takes turns drawn at the high reflecting material of the useful reflection coefficient in the surface of surface layer 1 more than 200 identifies 8-1 with wheel nip, wherein non-to take turns nip mark 8-2 be chequered with black and white oblique line, and wheel nip mark 8-1 is the white arrow being painted with instruction vehicle heading in the middle of the rigid pavement.
The construction method of this road structure, carry out according to the following steps:
Step one, roadbed are constructed
The thick element soil of 30cm is backfilled after clear table; Implement 20 times impact-rollings, rolling speed is 15km/h, makes the comprehensive modulus of resilience value E of the end face resistance to compression of roadbed
ocfor 100kPa.
Step 2, cushion construction
Be aggregate with the clean rubble of building stones fragmentation, select the standard class of building stones to be three grades; In aggregate, particle diameter is less than the granule content of 0.075mm is 2%, and has enough transmission coefficients.
Construction adopts the direct decking and rolling of not sieved rubble; Employing machine spreading, should avoid segregation in paving process, and for the position locally occurring to emanate, ensure its uniformity by supplementing the mode of mixing and stirring, that seriously emanates answers partial refuelling; Bed course after paving must have the initial compactness of suitable road camber and uniformity, to ensure consolidation effect; The qualified standard of compacting adopts the vibratory roller of deadweight 12 ~ 15 tons to roll under 20 ~ 25 tons of exciting forces, and surface is without obviously passing and wheelmark.
Step 3, base layer construction
1, basic unit is made up of 5% cement stabilized grading crushed stones, and cement stabilizing compound mixes and stirs and adopts mechanical mixing method;
2, the water content controlling blended stock before rolling and the uniformity of mixing and stirring, should roll when blended stock is in optimal compaction water content, each compacted depth is 10cm;
3, to note levelling in roller compaction process, fill up place and want scarifying reinforced, be again compacted into entirety;
4, cement stabilizing compound is 2 hours from the time delay (comprising the dry mixing time) adding cement and mixed and stirred compacting;
5, after roller-compaction, every day, watering carried out maintenance for several times, kept substrate surface to soak, and forbade spilling with water pipe punching, 10 days curing times, made the comprehensive modulus of resilience value E of the end face resistance to compression of basic unit
ojreach 1520kPa, immediately to surface construction after maintenance terminates.
Step 4, surface construction
1, colligation is positioned to the transversely distributed steelbar in surface layer structure, genesis analysis reinforcing bar, compression reinforcement, bending resistance reinforcing bar, lacing wire and stirrup; Bury dowel bar underground;
2, complete location colligation and the concreting after burying dowel bar underground of above-mentioned reinforcing bar, during spread concrete compound, the duration of vibrating of each position compound is stopped sinking with compound, no longer emits bubble and till glowing cement mortar, stop vibrating; Jolt ramming and roughly shake flat after, come and go to scrape with vibrations tamping plate and shake 3 times, by surperficial bleeding leveling, drive bubble out of, and excavation and filling polishing in time, when filling up, select thinner macadam-aggregate mix; Forbid when wiping one's face sprinkle water on concrete slab and spill cement flour; The surface suitable tools such as floating rear employing kerve device or rolling embossing device, transversely makes texture at concrete surface; Plucking or the embossing degree of depth are 3mm.
3, health
Health is started immediately after concrete surface making completes; Use the overburden wet curings such as moisture film, geotechnological felt, geotextiles, gunnysack, straw bag, straw screen or mat, every day, watering was no less than 6 times, kept concrete surface to be in dampness all the time; When temperature is 5 ~ 40 DEG C, conditioned time is no less than 28 days, and when temperature is less than 5 DEG C, conditioned time is no less than 60 days.
Step 5, joint-cutting and joint filling
Joint-cutting method is adopted to carry out joint-cutting to the longitudinal joint of carriageway plate and transverse joint, when concrete strength reaches 30% of design strength, with joint cutter cutting, depth of cut 3cm.
Slot should in the expired rear joint filling in time of concrete curing; Keep clean in seam before joint filling, ensure that pointing and concrete slotted wall adhere to simultaneously and closely do not seep water, should ensure that before open to traffic pointing has the sufficient scleroma time.
Step 6, drafting mark graticule
Identify and wheel nip mark at the non-nip of taking turns of the surface rendering of surface layer, wherein non-nip mark of taking turns adopts chequered with black and white oblique line, takes turns nip and is designated middle rigid pavement of drawing white arrow (instruction vehicle heading).Stock up vehicle and return vehicle is pressed respectively to be identified on No. 1 track and No. 2 tracks and is travelled (as shown in Figure 4).
Claims (9)
1. a harbour concrete road line structure, lays bed course (3), basic unit (2) and surface layer (1) respectively on roadbed (4); The thickness of surface layer, basic unit and bed course is respectively 30cm, 45cm and 25cm; Transversely distributed steelbar (15) and genesis analysis reinforcing bar (16) is furnished with on the top of surface layer; It is characterized in that: this harbour concrete road curb wherein heart line is divided into No. 1 track (I) and track, No. 2 (II) two, tracks; The surface layer (1) in two tracks is divided into some pieces of carriageway plates (5) by longitudinal length 400 ~ 600cm, transverse width 400 ~ 500cm, is equipped with dowel bar (7) in the transverse joint (6-2) of carriageway plate and longitudinal joint (6-1); Two tracks are divided into wheel nip (9-1) and non-ly take turns nip (9-2), the compression reinforcement (11) of laterally spaced 25cm is furnished with at the upper limb of wheel nip, the bending resistance reinforcing bar (10) of laterally spaced 12.5cm is furnished with at the lower edge of wheel nip, middle part longitudinal reinforcement (12) is had respectively at two middle side parts of wheel nip, between compression reinforcement and bending resistance reinforcing bar, have lacing wire (14), there is stirrup (13) outside of compression reinforcement, bending resistance reinforcing bar and middle part longitudinal reinforcement; There is non-nip of taking turns to identify (8-2) and wheel nip mark (8-1) on the surface of surface layer.
2. harbour concrete road line structure according to claim 1, is characterized in that: the hot rolled ribbed steel bar that described compression reinforcement (11) is diameter 12 ~ 16mm, length is less than carriageway plate (5) longitudinal length 4cm.
3. harbour concrete road line structure according to claim 1, is characterized in that: the hot rolled ribbed steel bar that described bending resistance reinforcing bar (10) is diameter 22 ~ 28mm, length is less than carriageway plate (5) longitudinal length 4cm.
4. harbour concrete road line structure according to claim 1, is characterized in that: described middle part longitudinal reinforcement (12) for diameter be 12 ~ 16mm, length is less than the hot rolled ribbed steel bar of carriageway plate (5) longitudinal length 4cm.
5. harbour concrete road line structure according to claim 1, it is characterized in that: the hot rolled ribbed steel bar that described stirrup (13) is diameter 12mm, within the scope of carriageway plate distance dual-side 50 ~ 70cm, stirrup spacing is 12.5cm, and within the scope of all the other, stirrup spacing is 25cm.
6. harbour concrete road line structure according to claim 1, it is characterized in that: the hot rolled ribbed steel bar that described lacing wire (14) is diameter 12mm, longitudinal mutual spacing is 25cm.
7. harbour concrete road line structure according to claim 1, it is characterized in that: described transversely distributed steelbar (15) and genesis analysis reinforcing bar (16) are respectively the hot rolled ribbed steel bar of diameter 12mm, transversely distributed steelbar mutual spacing is 10 ~ 15cm, and genesis analysis reinforcing bar is that 10 ~ 15cm is arranged in non-wheel in nip (9-2) scope by spacing.
8. harbour concrete road line structure according to claim 1, is characterized in that: described dowel bar is the hot calendering round bar of diameter 32mm, long 50cm, mutual spacing 30cm.
9. the construction method of harbour concrete road line structure described in claim 1, is characterized in that the step comprising following order:
Step one, roadbed are constructed
Backfill the thick element soil of 30cm after clear table, implement 20 times impact-rollings, rolling speed is 15km/h, makes the comprehensive modulus of resilience value E of the end face resistance to compression of roadbed
ocreach 80kPa ~ 120kPa;
Step 2, cushion construction
1) material requirements:
Select high-quality gravel or be aggregate with the clean rubble of building stones fragmentation, the building stones standard class selected is not less than three grades; The granule content that in aggregate, particle diameter is less than 0.075mm is less than 3%, and should have enough transmission coefficients;
2) construction requirement:
Natural mixing gravel or not sieved rubble, can direct decking and rolling, can pave after the material lorry mounted mixer uniform mixing that classification prepares; Employing machine spreading, should avoid segregation in paving process, and for the position locally occurring to emanate, ensure its uniformity by supplementing the mode of mixing and stirring, that seriously emanates answers partial refuelling; Bed course after paving must have the initial compactness of suitable road camber and uniformity, to ensure consolidation effect; The qualified standard of compacting is that the vibratory roller of deadweight 12 ~ 15 tons rolls under 20 ~ 25 tons of exciting forces, and surface is without obviously passing and wheelmark;
Step 3, base layer construction
1) basic unit is made up of 5% cement stabilized grading crushed stones, and cement stabilizing compound mixes and stirs and adopts mechanical mixing method;
2) must check the water content controlling blended stock and the uniformity of mixing and stirring before rolling, should roll when blended stock is in optimal compaction water content, each compacted depth is minimum is 5cm, is 15cm to the maximum;
3) to note levelling in roller compaction process, fill up place and want scarifying reinforced, be again compacted into entirety;
4) cement stabilizing compound is from the time delay adding cement and mixed and stirred compacting, should more than 2 hours;
5) after roller-compaction, every day, watering carried out maintenance for several times, kept substrate surface to soak, and forbade spilling with water pipe punching, and curing time must not be less than 7 days, makes the comprehensive modulus of resilience value E of the end face resistance to compression of basic unit
ojreach 1500kPa ~ 1550kPa; Should immediately to surface construction after maintenance terminates;
Step 4, surface construction
1) colligation is positioned to the transversely distributed steelbar in surface layer structure, genesis analysis reinforcing bar, compression reinforcement, bending resistance reinforcing bar, lacing wire and stirrup; Bury dowel bar underground;
2) after-pouring concrete buried underground by the location colligation and the dowel bar that complete above-mentioned reinforcing bar, during spread concrete compound, stops sinking to the duration of vibrating of each position compound, no longer emits bubble and till glowing cement mortar, stop vibrating with compound; Jolt ramming and roughly shake flat after, come and go to scrape with vibrations tamping plate and shake 2 ~ 3 times, by surperficial bleeding leveling, drive bubble out of, and excavation and filling polishing in time, select thinner macadam-aggregate mix when filling up, forbid to fill up levelling with sharp sand slurry; Forbid when wiping one's face sprinkle water on concrete slab and spill cement flour; The floating rear employing kerve device in surface or rolling embossing device transversely make texture at concrete surface; Plucking or the embossing degree of depth are 1 ~ 3mm;
3) health
Should start health immediately after concrete surface making completes, health overburden moisturizing also watering in time, keeps concrete surface to be in dampness all the time, during temperature 5 ~ 40 DEG C, conditioned time is no less than 28 days, and when temperature is less than 5 DEG C, conditioned time is no less than 60 days;
Step 5, joint-cutting and joint filling
Joint-cutting method is adopted to carry out joint-cutting to the longitudinal joint of carriageway plate and transverse joint, when concrete strength reaches 25% ~ 30% of design strength, with joint cutter cutting, depth of cut 2 ~ 3cm;
Slot should in the expired rear joint filling in time of concrete curing; Must keep clean in seam before joint filling, ensure that pointing should adhere to concrete slotted wall simultaneously and closely do not seep water, should ensure that before open to traffic pointing has the sufficient scleroma time;
Step 6, the surface rendering of surface layer non-take turns nip mark and wheel nip mark.
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| CN114755174A (en) * | 2022-06-13 | 2022-07-15 | 水利部交通运输部国家能源局南京水利科学研究院 | Impact rolling test device and method for simulating coarse-grained soil foundation in original stress state |
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