CN105239483A - Wharf concrete road structure and construction method thereof - Google Patents

Abstract

A wharf concrete road structure, on which a cushion, a base course and a surface course are respectively laid on the roadbed, and the upper part of the surface course has horizontally and vertically distributed steel bars. Driveway slabs, dowel bars are placed in the middle of the longitudinal and transverse joints between the driveway slabs, the driveway slabs are divided into wheel pressure areas and non-wheel pressure areas, and the upper edge of the wheel pressure area is equipped with compression steel bars, and the lower edge is clothed with Bending reinforcement, with longitudinal reinforcement in the middle of both sides, tension reinforcement between compression reinforcement and bending reinforcement, compression reinforcement, bending reinforcement and middle longitudinal reinforcement outside stirrups; surface layer surface with non-wheel compression area and wheel Nip identification. After the construction of the roadbed, cushion, base course and surface course in sequence, joint cutting and caulking, marking and marking lines shall be drawn. The road guides vehicles to drive along the wheel pressure zone with strong bending and cracking resistance through marking lines, so that the road can withstand the load of container vehicles with heavy traffic and heavy axle loads, and ensure the safety and durability of the surface layer. <!-- 2 -->

Description

A wharf concrete road structure and its construction method

technical field

The invention relates to road engineering, in particular to a wharf concrete road structure for running container heavy-duty trucks and a construction method thereof.

Background technique

Whether it is a passenger car or a truck, the entire weight of the body is transmitted to the road through the wheels on the axle. Therefore, for the road surface, great importance is attached to the axle load of the car. At present, the rear axle load of trucks running on highways in our country is generally controlled within the range of 60-130kN. The current road and urban road pavement design specifications in my country use 100kN as the design standard axle load.

The degree of damage to the pavement structure caused by axle loads of different gravity is different. In the design of road structures, in addition to considering the cumulative traffic volume of the road within the design period, the proportion of axle loads at all levels must also be considered.

The wharf is a distribution center for sea or river cargo loading and unloading. A large number of containers (the total weight of container vehicles is more than 40 tons) and heavy trucks are constantly transporting goods. The wharf concrete road is mainly used for such trucks. At present, concrete roads are generally used Structure: Pave the cushion, base and surface layer respectively on the road bed, and add horizontal and vertical reinforcement bars to the concrete of the surface layer. The safety and durability of this concrete road structure is difficult to be guaranteed due to the large cumulative traffic volume, the axle load of vehicles and the total weight.

Contents of the invention

The purpose of the present invention is to provide a wharf concrete road structure with good safety and durability, as well as a construction method for this structure.

In the wharf concrete road structure provided by the invention, a cushion course, a base course and a surface course are laid respectively above the road bed; the thicknesses of the course course, the base course and the course course are respectively 30cm, 45cm and 25cm; Steel bars and longitudinally distributed steel bars; the wharf concrete road is divided into two lanes, Lane 1 and Lane 2 along its center line; the surface of the two lanes is divided into several roadway slabs according to the longitudinal length of 400-600cm and the transverse width of 400-500cm , there are dowel bars in the transverse joints and longitudinal joints of the roadway slab; the two lanes are divided into the wheel pressure area and the non-wheel pressure area, and the upper edge of the wheel pressure area is equipped with compressive steel bars with a transverse interval of 25cm. The lower edge of the wheel pressure area is equipped with bending steel bars with a transverse interval of 12.5cm, and there are middle longitudinal steel bars in the middle of both sides of the wheel pressure area, and there are tension bars between the compression steel bars and the bending steel bars. There are stirrups on the outside of the bending steel bars and the middle longitudinal steel bars; there are non-wheel pressure area marks and wheel pressure area marks on the surface of the surface layer.

The compression-resistant steel bar is a hot-rolled ribbed steel bar with a diameter of 12-16 mm and a length less than 4 cm in length of the roadway slab.

The bending-resistant steel bar is a hot-rolled ribbed steel bar with a diameter of 22-28 mm and a length less than 4 cm of the longitudinal length of the roadway slab.

The middle longitudinal steel bar is a hot-rolled ribbed steel bar with a diameter of 12-16 mm and a length less than 4 cm of the longitudinal length of the roadway slab.

The stirrups are hot-rolled ribbed steel bars with a diameter of 12 mm, and the distance between the stirrups is 12.5 cm within the range of 50-70 cm from the two sides of the roadway slab, and 25 cm within the rest of the range.

The tie bars are hot-rolled ribbed steel bars with a diameter of 12 mm, and the longitudinal distance between them is 25 cm.

The transversely distributed steel bars and longitudinally distributed steel bars are hot-rolled ribbed steel bars with a diameter of 12 mm respectively, and the mutual spacing of the horizontally distributed steel bars is 10-15 cm, and the vertically distributed steel bars are arranged at a distance of 10-15 cm in the non-wheel pressure area.

The dowel bar is a hot-rolled smooth round steel bar with a diameter of 32mm, a length of 50cm, and a distance of 30cm.

The construction method of above-mentioned road structure, comprises the steps of following order:

Step 1. Road bed construction

Backfill plain soil with a thickness of 30cm after clearing the surface; implement 20 times of impact rolling at a rolling speed of 10-15km/h; make the top surface of the road bed compressive comprehensive elastic modulus E _oc reach 80kPa-120kPa;

Step 2. Cushion construction

1) Material requirements

Use high-quality gravel or clean gravel crushed with stones as the aggregate, and the standard grade of the selected stone is not lower than grade three; the particle content of particles with a particle size of less than 0.075mm in the aggregate is less than 3%, and it should have sufficient permeability coefficient;

2) Construction requirements

Natural mixed gravel or unscreened crushed stone can be directly paved and rolled, and the materials prepared for grading can be paved after being evenly mixed with a mixer; mechanical paving should be used to avoid segregation during the paving process, and for local segregation Parts, ensure its uniformity by means of supplementary mixing, and local refueling should be used for severe segregation; the cushion layer after paving must have a suitable road crown and uniform initial density to ensure the compaction effect; compaction qualified The standard is that a vibratory roller with a dead weight of 12 to 15 tons is rolled under an exciting force of 20 to 25 tons, and there is no obvious movement and wheel marks on the surface;

Step three, base construction

1) The base layer is composed of 5% cement-stabilized graded gravel, and the cement-stabilized mixture is mixed by mechanical mixing method;

2) Before rolling, it is necessary to check and control the water content of the mixture and the uniformity of mixing. The rolling should be carried out when the mixture is at the best compaction water content. The minimum thickness of each compaction is 5cm, and the maximum is 15cm;

3) Pay attention to leveling during the rolling process, loosen and add materials to the filling place, and re-compact into a whole;

4) The delay time (including the dry mixing time) of the cement stabilized mixture from adding cement and mixing to the completion of compaction should not exceed 2 hours;

5) After rolling and forming, sprinkle water several times a day for maintenance to keep the surface of the base layer moist, and it is forbidden to spray it with a water pipe. The curing period should not be less than 7 days, so that the compressive comprehensive elastic modulus E _oj of the top surface of the base layer can reach 1500kPa ～1550kPa; after curing, the surface layer should be constructed immediately

Step 4, surface construction

1) Position and bind the horizontally distributed steel bars, longitudinally distributed steel bars, compressive steel bars, bending steel bars, tie bars and stirrups in the surface structure; bury dowel bars;

2) After the positioning and binding of the above steel bars and the embedding of the dowel bar are completed, the concrete is poured. When the concrete mixture is spread, the duration of vibration of the mixture at each position is such that the mixture stops sinking, no longer bubbles, and the cement is released. Stop vibrating until the mortar is in place; after vibrating and roughly leveling, use a vibrating tamping plate to scrape back and forth 2 to 3 times to level the surface and drive out air bubbles, and dig and fill in time. When filling, use a finer It is strictly forbidden to use pure mortar to fill and level the gravel mixture; it is strictly forbidden to sprinkle water and cement powder on the concrete panel when plastering the surface; The grain depth is 1~3mm;

3) Health preservation

After the concrete surface is paved, the health preservation should be started immediately. The health maintenance cover should be used to moisturize and sprinkle water in time to keep the concrete surface always in a humid state. Not less than 60 days;

Step 5. Cutting and caulking

Use the slitting method to slit the longitudinal and transverse joints of the roadway slab. When the concrete strength reaches 25% to 30% of the design strength, use a slitting machine to cut with a cutting depth of 2 to 3cm;

The slots should be filled in time after the concrete curing period expires; before filling the joints, the inside of the joints must be kept clean, and at the same time, ensure that the joint filling materials should adhere tightly to the concrete joint wall and prevent water seepage. induration time;

Step 6, draw the non-rolling area mark and the wheel pressing area mark on the surface of the surface layer.

The wharf concrete road built by the above-mentioned construction method has the following beneficial effects:

1. High modulus road bed, cushion and base course are used. First, it can effectively reduce the deflection value deformation of the surface course under heavy load, which can greatly improve the durability of the concrete panel on the surface course; The thickness of the slab is uniform, the fatigue stress of temperature difference and humidity difference is greatly reduced, and the fatigue resistance of the pavement structure is improved; the third is that the joint load transfer capacity of the concrete slab is significantly improved, which is convenient for later maintenance and improves the service life of the pavement .

2. Guide the container vehicles to the specified wheel pressure area through the marking line, and arrange bending and compression steel bars in the surface layer of the wheel pressure area in a targeted manner, which improves the bending and crack resistance of the wheel pressure area Bearing capacity; stirrups and tie bars can constrain the concrete in the wheel compression area, improving the tensile and compressive properties of the concrete; so that the surface layer of the wheel compression area can withstand the load of container vehicles with heavy traffic and axle loads, ensuring Safety and durability of the surface layer.

3. The stirrups are arranged at a distance of 12.5cm within the range of 50-70cm from both ends of the roadway slab, and are encrypted to ensure the bending and crack resistance of both ends of the roadway slab.

4. At the position where the force is weak on the side of the roadway slab, the container vehicles are guided to the specified driving path through the marking line, which avoids the action of the container vehicle wheels on the side of the roadway slab, and avoids the unfavorable factors in terms of force; At the same time, by dividing the non-wheel pressure area and configuring reinforcement in the non-wheel pressure area according to the routine, it is beneficial to save the project cost.

5. The use of high reflective markings can greatly improve the safety of driving at night, and also improve the efficiency of driving at night.

6. The structure is easy to construct on site and easy to maintain later.

Description of drawings

Accompanying drawing provides the schematic diagram of the embodiment of the present invention, wherein:

Fig. 1 is the sectional schematic diagram of wharf concrete road;

Fig. 2 is a cross-sectional view in the horizontal direction of the upper part of the surface layer in Fig. 1;

Fig. 3 is the traffic sign diagram on the surface layer surface in Fig. 1;

Fig. 4 is a schematic diagram of the vehicle traveling along the road marked in Fig. 3;

Figure 5 is a reinforcement diagram of the road surface.

detailed description

The present invention will be further described below in conjunction with drawings and embodiments.

The present embodiment wharf concrete road structure, as shown in Figure 1, lays respectively 25cm thick cushion course 3, 45cm thick base course 2 and 30cm thick surface course 1 above the road bed 4, and the total width of the road is 850cm.

As shown in Figure 2, the concrete is divided into two lanes with a width of 425cm along the center line of the road, where Lane 1 is the incoming goods lane and Lane 2 II is the return lane. The surface layer 1 of the two lanes is divided into several pieces of concrete cast-in-place roadway slabs 5 according to the longitudinal length (the length along the longitudinal direction of the road) of 450cm and the transverse width (the length along the transverse direction of the road) of 425cm. -1 (gap along the longitudinal direction of the road) and transverse joint 6-2 (gap along the transverse direction of the road) center the dowel bar 7, the dowel bar is a hot-rolled smooth round steel bar with a diameter of 32mm, a length of 50cm, and a mutual distance of 30cm HPB300.

As shown in Figure 3, the two lanes are equally divided into a wheel pressure zone 9-1 and a non-wheel pressure zone 9-2. The width of two wheel pressure zones 9-1 on each lane is 100cm, and mutual spacing 80cm, and the distance of outer wheel pressure zone is 72.5cm apart from the distance of roadway lateral side, and is non-wheel pressure zone 9-2 outside the wheel pressure zone.

As shown in Figure 5, five hot-rolled ribbed steel bars HRB400 with a diameter of 12-16 mm, a length of 446 cm, and an interval of 25 cm are arranged on the upper edge of the wheel pressure area 9-1 to form a transverse compressive steel bar 11; The lower edge of 9-1 has 10 hot-rolled ribbed steel bars HRB400 with a diameter of 2-28 mm, a length of 446 cm, and a distance of 12.5 cm to form a bending steel bar 10; The hot-rolled ribbed steel bar HRB400 of ~16mm and length 446cm constitutes the middle longitudinal steel bar 12; between the compression steel bar and the bending steel bar there is a hot-rolled ribbed steel bar HRB400 with a diameter of 12mm and a longitudinal distance of 25cm to form the tension bar 14; There are stirrups 13 outside the compressive steel bars, bending steel bars and longitudinal steel bars in the middle, and the distance between the stirrups is 12.5 cm within the range of 50-70 cm from the two sides of the roadway slab in the longitudinal direction, and the distance between the stirrups in the rest of the range is 25 cm. The rib is a hot-rolled ribbed steel bar HRB400 with a diameter of 12 mm. On the upper part of the non-wheel pressure area 9-2, 10cm away from the surface, there are hot-rolled ribbed steel bars HRB400 with a diameter of 12mm and a distance of 15cm between each other. The horizontally distributed steel bars 15 and the diameter of 12mm are placed at both ends of the roadway plate distance along the longitudinal direction of the road. Longitudinal distributed steel bars 16 composed of hot-rolled ribbed steel bars RB400 with a mutual distance of 12.5 cm in the range of 50 to 70 cm and a mutual distance of 15 cm in the rest of the range. On the surface of the surface layer 1, there are non-rolling area marks 8-2 and wheel pressing area marks 8-1 drawn with high-reflective materials with a reflection coefficient of more than 200, wherein the non-wheel pressing area marks 8-2 are black and white slashes , the sign 8-1 of the wheel pressure zone is a white arrow drawn in the middle of the concrete pavement to indicate the driving direction of the vehicle.

The construction method of this road structure is carried out in the following steps:

Step 1. Road bed construction

After clearing the surface, backfill with 30cm thick plain soil; implement 20 times of impact rolling at a rolling speed of 15km/h, so that the comprehensive elastic modulus E _oc of the top surface of the roadbed is 100kPa.

Step 2. Cushion construction

The clean crushed stone crushed by stone is used as aggregate, and the standard grade of selected stone is Grade III; the content of particles with a particle size of less than 0.075mm in the aggregate is 2%, and has sufficient permeability coefficient.

Unscreened crushed stones are used for direct paving and rolling; mechanical paving is used, and segregation should be avoided during the paving process. For parts where segregation occurs locally, the uniformity of the parts should be ensured by supplementary mixing. material; the cushion layer after paving must have a suitable road arch and uniform initial density to ensure the compaction effect; the standard for compaction is to use a vibratory road roller with a dead weight of 12 to 15 tons to vibrate at 20 to 25 tons Rolling is carried out under high pressure, and there is no obvious movement and wheel marks on the surface.

Step three, base construction

1. The base layer is composed of 5% cement-stabilized graded gravel, and the cement-stabilized mixture is mixed by mechanical mixing method;

2. Control the water content of the mixture and the uniformity of mixing before rolling. Rolling should be carried out when the mixture is at the best compaction water content, and the thickness of each compaction is 10cm;

3. Pay attention to leveling during the rolling process, loosen and add materials to the filling place, and re-compact it into a whole;

4. The delay time (including dry mixing time) for the cement stabilized mixture from adding cement to the completion of compaction is 2 hours;

5. After rolling and forming, sprinkle water several times a day for maintenance to keep the surface of the base layer moist. Sprinkling with water pipes is prohibited. The curing period is 10 days, so that the top surface of the base layer has a compressive comprehensive rebound modulus value E _oj of 1520kPa. Immediately after the completion of the construction of the surface layer.

Step 4, surface construction

1. Locate and bind the transversely distributed steel bars, longitudinally distributed steel bars, compressive steel bars, bending steel bars, tie bars and stirrups in the surface structure; bury dowel bars;

2. Concrete is poured after the positioning and binding of the above-mentioned steel bars and dowel bars are buried. When paving the concrete mixture, the duration of vibration of the mixture at each position is such that the mixture stops sinking, no longer bubbles, and the cement comes out Stop vibrating until the mortar is compacted; after vibrating and roughly leveling, scrape and vibrate 3 times with a vibrating tamping plate to level the surface, drive out air bubbles, and dig and fill in time. When filling, use finer crushed Stone mixture; it is strictly forbidden to sprinkle water and cement powder on the concrete panel when plastering the surface; after the surface is smoothed, use suitable tools such as groovers or rolling embossers to make textures along the horizontal direction of the concrete surface; the depth of roughening or embossing is 3mm.

3. Health preservation

Immediately after the concrete surface is paved, start to maintain health; use moisturizing membranes, geotextiles, geotextiles, sacks, straw bags, straw curtains and other coverings to moisturize and maintain health, and sprinkle water no less than 6 times a day to keep the concrete surface always in a moist state; When the temperature is 5-40°C, the health preservation time is not less than 28 days, and when the temperature is lower than 5°C, the health preservation time is not less than 60 days.

Step 5. Cutting and caulking

Use the slitting method to slit the longitudinal and transverse joints of the roadway slab. When the concrete strength reaches 30% of the design strength, use a slitting machine to cut with a cutting depth of 3cm.

The seams should be filled in time after the concrete curing period expires; the seams should be kept clean before filling, and at the same time, ensure that the seam fillers are tightly adhered to the concrete wall and prevent water seepage. Before opening to traffic, the seam fillers should have sufficient hardening time .

Step 6. Draw the marking line

Draw the non-wheel pressure area mark and the wheel pressure area mark on the surface of the surface layer. The non-wheel pressure area mark adopts black and white slashes, and the wheel pressure area mark is the concrete pavement with white arrows (indicating the driving direction of the vehicle) drawn in the middle. The incoming vehicle and the returning vehicle travel on the No. 1 lane and the No. 2 lane according to the signs respectively (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.