CN111501512A - Multi-stage rubblization construction method for road surface - Google Patents
Multi-stage rubblization construction method for road surface Download PDFInfo
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- CN111501512A CN111501512A CN202010362212.XA CN202010362212A CN111501512A CN 111501512 A CN111501512 A CN 111501512A CN 202010362212 A CN202010362212 A CN 202010362212A CN 111501512 A CN111501512 A CN 111501512A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/12—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/01—Devices or auxiliary means for setting-out or checking the configuration of new surfacing, e.g. templates, screed or reference line supports; Applications of apparatus for measuring, indicating, or recording the surface configuration of existing surfacing, e.g. profilographs
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/12—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor
- E01C23/122—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor with power-driven tools, e.g. oscillated hammer apparatus
- E01C23/124—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor with power-driven tools, e.g. oscillated hammer apparatus moved rectilinearly, e.g. road-breaker apparatus with reciprocating tools, with drop-hammers
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Abstract
A road surface multistage rubblization construction method comprises the following steps: preparing before crushing construction; carrying out crushing construction on the plain cement concrete panel, and carrying out integral crushing on the pavement; local crushing is carried out on local large concrete blocks on the surface of the rubble layer; crushing the fracture part of the plain cement concrete plate; compacting the backfill graded broken stones; testing the resilience modulus of the top surface of the crushed stone layer; comparing the average deflection values before and after crushing; crushing the double-layer reinforced cement panel, and performing punching and pre-splitting by using hydraulic punching equipment; crushing the whole pavement; local crushing is carried out on local large concrete blocks on the surface of the rubble layer; compacting the backfill graded broken stones; testing the resilience modulus of the top surface of the crushed stone layer; comparing the average deflection values before and after crushing; and finally carrying out subsequent treatment. The construction process is suitable for the transformation process of most old concrete pavements, is high in construction speed and construction efficiency, reinforces the strength of important nodes, and is low in overall construction cost.
Description
Technical Field
The invention relates to the field of pavement construction, in particular to a pavement multistage rubblization construction method.
Background
Heavy goods transportation in port areas causes large pressure to port area roads, the damage condition of part of port area roads is serious at present due to long service life, most of the roads are close to the design life of the roads, and part of the roads are used in the state of exceeding the design life. The pavement of the harbor area mostly uses cement pavement to meet the heavy load demand, however, the massive joint structure of the cement pavement provides a sufficient path for moisture to enter the interior of the pavement structure, thereby causing the weakness and the void of the structural foundation. Once the cement pavement has the phenomena of weak foundation and void, the service life of the cement pavement is rapidly reduced, and the phenomena of slab staggering, slab corner fracture, slab fragmentation and the like are shown. The maintenance of the damaged cement pavement is very difficult, which is characterized by large engineering quantity, long construction period and high cost, and the original pavement repair adopts maintenance methods such as local plate replacement or grouting and the like, so that the problem of low service quality of the whole road cannot be fundamentally solved.
The cement pavement structure of the harbor district road generally comprises a double-layer or single-layer reinforced cement concrete panel or a plain cement concrete panel so as to meet the heavy load requirement, however, a large number of seam structures which are necessary to be arranged on the cement pavement provide a way for water to enter the interior of the pavement structure, and under the combined action of the harbor district heavy load and water, a base layer and roadbed materials below the panel are greatly lost, so that the weakness and the void of the structure foundation are caused. And once the cement pavement has the phenomena of weak foundation and void, the service life of the cement pavement is rapidly reduced. The reinforced cement concrete panel has high structure strength and takes slab staggering as a main damage mode. The road section of the plain cement concrete panel is mainly damaged in the forms of fracture, crack, sludge and the like. The original pavement base layer is an inorganic binder stabilized macadam cushion layer, and the excavation of a test pit shows that the surface is loose and serious and the strength is insufficient. In order to meet the requirement of the restoration process of the cement concrete pavement in a harbor area, original cement pavement needs to be broken and transformed no matter from the angle of completely excavating and abandoning the original cement pavement or continuously paving or rebuilding the cement pavement structure on the basis of the original pavement.
In current road surface rubble chemical construction mode, adopt many tups rubble chemical machinery or resonance rubble chemical machinery to carry out the road surface breakage more, consider the efficiency of construction, the time limit for a project, high operability factor, construction cost and the adaptability to on-the-spot actual conditions, generally adopt many tups rubble chemical machinery to construct, it has good efficiency of construction to carry out direct breakage to the whole board of plain cement concrete panel to many tups rubble chemical machinery, but to the bilayer, individual layer arrangement of reinforcement cement concrete panel, the condition such as plate body fracture area, the effect is relatively poor, construction method has the limitation, can not adopt single construction mode to carry out unified construction.
Disclosure of Invention
In order to solve the existing problems, the invention discloses a road surface multistage rubblization construction method, which has the following specific technical scheme: a road surface multistage rubblization construction method comprises the following steps:
A. preparing before crushing construction;
(1) investigating, marking, analyzing and judging hidden structures such as culverts, channels, underground pipelines and the like around the broken pavement;
(2) grasping relevant parameters such as the damage condition, the thickness, the size of each plate and the like of the old pavement;
① selecting a crushing test road section, and carrying out detailed measurement and setting on road conditions (crack length, width, number and the like) and elevation before crushing.
② measuring the deflection value of old road surface and the rebound modulus of base top surface, wherein the crushed block diameter of the base is 40-200 cm and is judged as crushed, and the crushed block diameter is smaller than 40cm and is judged as loose;
(3) draining water on the broken pavement in an open ditch or broken stone blind ditch mode;
B. crushing construction of the plain cement concrete panel;
(1) adopting multi-hammer crushing equipment to perform overall crushing on the road surface;
(2) observing whether the crushed stone layer of the whole plain cement concrete slab is settled or not and whether the crushed stone layer of the whole plain cement concrete slab meets the maximum particle size requirement of 75% of guarantee rate or not;
(3) local crushing of local large concrete blocks on the surface of the rubble layer is carried out by adopting single-hammer crushing equipment;
(4) detecting the resilience modulus of the top surface after rubblization by using a portable drop hammer deflectometer;
(5) crushing the fracture part of the plain cement concrete plate;
① adjusting parameters of the hammerhead of the multi-hammerhead crushing equipment, and performing secondary crushing construction on the broken part of the cement concrete plate;
② removing the broken stone layer at the broken part of the cement concrete plate after the secondary breaking construction;
③ paving graded broken stones at the position with larger settlement (not less than 5 cm);
(6) backfilling a gravel layer at a settlement position with graded gravel, and compacting the backfilled graded gravel;
(7) testing the resilience modulus of the top surface of the crushed stone layer by using a bearing plate method;
(8) comparing the average deflection value of the compacted broken stone layer with the average deflection value of the plain cement concrete plate body before breaking;
C. carrying out crushing construction on the double-layer reinforced cement panel;
(1) adopting hydraulic punching equipment to punch and presplit the double-layer reinforced cement;
(2) adopting multi-hammer crushing equipment to perform overall crushing on the road surface;
(3) local crushing of local large concrete blocks on the surface of the rubble layer is carried out by adopting single-hammer crushing equipment;
(4) backfilling graded broken stones by adopting the graded broken stones to form an obviously settled broken stone layer after crushing, and compacting the backfilled graded broken stones;
(5) testing the resilience modulus of the top surface of the crushed stone layer by using a bearing plate method;
(6) comparing the average deflection value of the compacted broken stone layer with the average deflection value of the double-layer reinforced cement panel before breaking;
D. subsequent treatment;
(1) surface treatment; spreading emulsified asphalt priming oil on the surfaces of broken and compacted plain cement concrete and double-layer reinforced cement rubblized layers;
(2) protecting a finished product; enclosing and sealing the crushed site;
(3) secondary repair; after the compacted broken stone layer is damaged by vehicles, secondary compaction repair is carried out;
(4) rain protection; adopting waterproof cloth to cover and protect the crushed stone layer; used for preventing the strength of the base layer from being reduced due to rainwater infiltration.
Furthermore, the multi-hammer head crushing equipment adopts an MHB type crusher.
Furthermore, the deflection value of the road surface is measured by a drop hammer type deflectometer.
Furthermore, the single-hammer crushing equipment comprises a frame body, universal casters, driving casters, a caster shaft, a driven gear, a caster motor, a driving gear, a bottom plate, a transverse plate, lifting support legs, a support leg hydraulic rod, a top plate, a lifting motor, a lifting reel, a fixed pulley, a top hydraulic rod, a movable plate, a sheath cylinder, a hammer body and a lifting rope; the universal casters are arranged at two ends of one side of the bottom surface of the frame body; the driving trundles are arranged at two ends of the other side of the top surface of the frame body, the trundles at the two ends coaxially rotate through trundle shafts, and the driven gears are arranged on the trundle shafts; the caster motor is fixed on one side of the bottom surface of the frame body, the driving gear and the caster motor rotate coaxially, and the driving gear and the driven gear are in meshing transmission; the transverse rods on the two sides of the frame body are in a groove shape to form a bottom plate clamping groove, the bottom plate is embedded into the bottom plate clamping groove, and one side of the bottom plate is in a transverse opening-shaped structure to form a bottom plate opening; the transverse plates are arranged at the middle ends of the two sides of the frame body, the lifting support legs are arranged at the two sides of the frame body and are rotatably arranged with the transverse plates through movable hinges, and the support leg hydraulic rods are arranged at the bottom ends of the lifting support legs; the top plate is arranged on the top surface of the frame body, the hoisting motor is fixed to the top end of one side of the frame body through a hoisting motor support, and the hoisting reel is arranged on the top surface of the hoisting motor support and is driven to rotate through the hoisting motor; the fixed pulley is arranged on the top surface of the top plate and is fixed with the top plate through a fixed pulley bracket; the top hydraulic rod is arranged on the bottom surface of the top plate; the movable plate is fixed on the bottom surface of the top hydraulic rod, and the protective sleeve is fixed on the bottom surface of the movable plate through bolts; the hammer block is arranged in the sheath cylinder, one end of the lifting rope is fixed to the top end of the hammer block, and the other end of the lifting rope penetrates through the top plate and bypasses the fixed pulley to be fixed with the lifting reel.
Furthermore, the bottom surface one end of every side bottom plate draw-in groove is equipped with the locating hole, the quantity of locating hole is two, every the locating hole is the blind hole form, is the internal thread structure, runs through the bolt one side of bottom plate and stretch into realize the bottom plate with the framework is fixed in the locating hole.
Furthermore, the bottom plate opening is of a semicircular structure, and the diameter of the bottom plate opening is slightly smaller than the diameter of the side wall of the hammer body.
Furthermore, the bottom edge circumference of a sheath section of thick bamboo is the cockscomb structure.
Furthermore, the bottom end of the hammer body is conical.
Furthermore, aggregates with the aggregate particle size of less than 26.5mm of the graded macadam account for 100 percent of the total mass of the graded aggregates; the aggregate with the aggregate particle size of less than 19.0mm accounts for 100-95% of the total mass of the graded aggregate; aggregates with the aggregate particle size of less than 13.2mm account for 70-79% of the total mass of the graded aggregates; aggregates with the aggregate particle size of less than 4.75mm account for 40-30% of the total mass of the graded aggregates; the aggregate with the aggregate particle size of less than 1.18mm accounts for 12-20% of the total mass of the graded aggregate; aggregates with the aggregate particle size of less than 0.3mm account for 5-10% of the total mass of the graded aggregates; the aggregate with the aggregate particle size of less than 0.075mm accounts for 2-5% of the total mass of the graded aggregate.
Furthermore, the structure of the crushed stone layer forms crushed stone grading from top to bottom, the maximum grain size of 75% of the area of the top of the crushed stone layer is less than or equal to 7.5cm, the maximum grain size of the middle of the crushed stone layer is less than or equal to 22.5cm, the maximum grain size of the bottom of the crushed stone layer is less than or equal to 37.5cm, and the top, the middle and the bottom of the crushed stone layer form continuous grading with cracks and no crushing.
Furthermore, the compaction modes are all implemented by adopting a Z-shaped road roller and a smooth-wheel road roller for compaction in sequence, and the compaction frequency of each device is three times.
Furthermore, the compaction equipment wets the vegetarian cement concrete gravel layer or the double-layer reinforced cement gravel layer in the first and third compaction processes.
Furthermore, 50% of slow-breaking emulsified asphalt is spread on the surface of the emulsified asphalt priming oil according to the dosage of 2.5-3.5 (kg/square meter).
The invention has the beneficial effects that:
the invention provides a multilevel rubblization construction method for a road surface, which respectively provides targeted construction methods aiming at two structural forms of plain cement concrete and double-layer reinforced cement of the existing concrete road surface, the whole construction process is suitable for the transformation process of most old concrete road surfaces, the rubblization process is optimized, a combined rubblization scheme of hydraulic hammer drilling and pre-splitting and multi-hammer head crushing is determined, a targeted transformation scheme is provided for a staggered severe road section and a broken plate severe road section, and a transformation scheme which can be used for large-scale construction is established and a construction guide scheme is established.
The construction process design is carried out aiming at the whole plate structure of the plain cement concrete panel, the construction requirement on whole plate crushing is low, the construction speed is high, and the construction efficiency is high; meanwhile, the process design of important construction nodes is carried out on local plate body fracture areas which are easily generated by the plain cement concrete, so that the broken plain cement concrete has stronger structural performance, the nodes with defects in the original roadbed are reinforced in strength, and the broken plain cement concrete has higher strength after being subjected to pavement breaking treatment.
The hydraulic punching equipment and the multi-hammer crushing equipment are matched for use, the number of holes formed in the hydraulic punching equipment is scientifically and reasonably planned, the strength of the crushed double-layer reinforced cement concrete is improved, the double-layer reinforced cement concrete is crushed more uniformly in the construction process, and the construction process is reasonable.
The single-hammer crusher is used for crushing local large concrete in a crushed stone layer of multi-concrete after large-scale equipment crushing, replaces manual operation with a handheld electric tool to perform the process operation, and is compact in structure, convenient to transport and flexible in use.
The multistage rubblization process method has the advantages of strong adaptability, short process flow and reduction of the overall construction cost.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Fig. 2 is a side view of the single hammer head breaking device of the present invention.
Fig. 3 is a cross-sectional view of a single hammer head breaking device of the present invention.
Fig. 4 is a partial schematic view of a single ram breaker housing of the present invention.
Fig. 5 is a schematic view of the mounting of the frame and the bottom plate of the single-hammer head crushing device of the present invention.
FIG. 6 is a hole layout of a monolithic double layer reinforced cement slab of example 7 of the present invention.
FIG. 7 is a parameter comparison table of examples of the present invention and comparative examples.
List of reference numerals: the device comprises a single hammer head crushing device 1, a frame body 1-1, a bottom plate clamping groove 1-1-1, a positioning hole 1-1-2, a universal caster 1-2, a driving caster 1-3, a caster shaft 1-4, a driven gear 1-5, a caster motor 1-6, a driving gear 1-7, a bottom plate 1-8, a bottom plate opening 1-8-1, a transverse plate 1-9, a lifting support leg 1-10, a support leg hydraulic rod 1-11, a top plate 1-12, a lifting motor 1-13, a lifting motor support 1-13-1, a lifting reel 1-14, a fixed pulley 1-15, a top hydraulic rod 1-16, a movable plate 1-17, a sheath cylinder 1-18, a hammer body 1-19 and a lifting rope 1-20;
Detailed Description
In order to make the technical scheme of the invention clearer and clearer, the invention is further described with reference to the accompanying drawings, and any scheme obtained by carrying out equivalent replacement and conventional reasoning on the technical characteristics of the technical scheme of the invention falls into the protection scope of the invention. The fixed connection, the fixed arrangement and the fixed structure mentioned in the embodiment are all known technologies known to those skilled in the art, such as welding, screw connection, bolt-nut connection, riveting and the like.
Example 1
A multi-stage rubblization construction method for a pavement comprises the steps of crushing a whole cement concrete slab, and comprises the following steps:
A. preparing before crushing construction;
(1) concealed structures such as culverts, tunnels, underground pipelines, and the like;
(2) the length of a single cement concrete whole plate panel is 5m, the width is 4m, and the thickness of the panel is 25 cm; the average deflection value of a single whole plate of the old pavement is 0.163mm, and the rebound modulus of the top surface of the base layer is 21.0 MPa;
B. crushing construction of the plain cement concrete panel;
(1) adopting multi-hammer crushing equipment to perform overall crushing on the road surface; adjusting the parameters of the multi-hammer head crushing equipment, wherein the height of a drop hammer is 2200ms, and the frequency of the drop hammer is 18 times/minute;
(2) observing whether a broken stone layer of the whole cement concrete plate is settled after being broken; the broken stone layer of the whole plain cement concrete plate meets the maximum particle size requirement of 75 percent of guarantee rate;
(3) local crushing of local large concrete blocks on the surface of the rubble layer is carried out by adopting single-hammer crushing equipment;
the crushing principle of the single-hammer crushing equipment is as follows: the driving gear is driven to rotate by the trundle motor, the driven gear is meshed with the driven gear to drive the trundle shaft and the trundle to rotate, and the frame body moves to a target position; rotating the lifting support legs, and starting the support leg hydraulic rods to drive the frame body to ascend; transversely moving the bottom plates at two sides in the bottom plate clamping grooves, fixing the bottom plates at two sides with positioning holes at the outer sides through bolts, and loosening a clamping support for the bottom end of the hammer body from an opening of the bottom plate; starting a jacking hydraulic rod to push the movable plate and the sheath cylinder to move downwards and jack the large concrete blocks to be crushed; loosening the hoisting reel, enabling the hammer body to freely fall in the sheath cylinder to crush the large concrete block at the bottom end, hoisting the hammer body by starting the hoisting motor to wind the hoisting rope, and enabling the hammer body to fall and crush;
(4) detecting the resilience modulus of the top surface of the excavated base layer by using a portable drop hammer deflectometer, wherein the display value of the resilience modulus of the top surface of the base layer is 24.6 MPa;
(5) backfilling a gravel layer at a settlement position with graded gravel, and compacting the backfilled graded gravel;
the aggregate grain size of the graded broken stone is selected from aggregate with the grain size less than 26.5mm accounting for 100 percent of the total mass of the graded aggregate; the aggregate with the aggregate grain size of less than 21.5mm accounts for 75 percent of the total mass of the graded aggregate; the aggregate with the aggregate grain size of less than 12mm accounts for 45 percent of the total mass of the graded aggregate; the aggregate with the aggregate grain size of less than 6.5mm accounts for 28 percent of the total mass of the graded aggregate; the aggregate with the aggregate grain size of less than 3.55mm accounts for 18 percent of the total mass of the graded aggregate; the aggregate with the aggregate grain size of less than 1mm accounts for 7 percent of the total mass of the graded aggregate; the aggregate with the aggregate grain size of less than 0.05mm accounts for 2 percent of the total mass of the graded aggregate.
(6) Testing the resilience modulus of the top surface of the crushed stone layer by using a bearing plate method, wherein the resilience modulus of the top surface of the crushed stone layer shows a value of 114.06 MPa;
compared with the resilience modulus of 21.0MPa of the top surface of the base layer of the original cement concrete plate body before crushing, the resilience modulus of 114.06MPa of the top surface of the crushed stone layer is smaller.
(7) Comparing the average deflection value of the compacted broken stone layer with the average deflection value of the plain cement concrete plate body before breaking;
and comparing that the average deflection value of the plain cement concrete plate body before crushing is 0.163mm less than the average deflection value of the crushed stone layer after compacting is 2.328 mm.
Example 2
A multi-stage rubblization construction method for a pavement comprises the steps of crushing a whole cement concrete slab, and comprises the following steps:
A. preparing before crushing construction;
(1) concealed structures such as culverts, tunnels, underground pipelines, and the like;
(2) the length of a single cement concrete whole plate panel is 5m, the width is 4m, and the thickness of the panel is 25 cm; the average deflection value of a single whole plate of the old pavement is 0.12mm, and the resilience modulus of the top surface of the base layer is 15.1 MPa;
B. crushing construction of the plain cement concrete panel;
(1) adopting multi-hammer crushing equipment to perform overall crushing on the road surface; adjusting the parameters of the multi-hammer head crushing equipment, wherein the height of a drop hammer is 2200ms, and the frequency of the drop hammer is 18 times/minute;
(2) observing that the broken stone layer of the whole broken cement concrete plate has settlement with the settlement depth of 7 cm; the broken stone layer of the whole plain cement concrete plate meets the maximum particle size requirement of 75 percent of guarantee rate;
(3) local crushing of local large concrete blocks on the surface of the rubble layer is carried out by adopting single-hammer crushing equipment;
(4) detecting the resilience modulus of the top surface of the excavated base layer by using a portable drop hammer deflectometer, wherein the display value of the resilience modulus of the top surface of the base layer is 25.2 MPa;
(5) backfilling a gravel layer at a settlement position with graded gravel, and compacting the backfilled graded gravel;
(8) testing the resilience modulus of the top surface of the crushed stone layer by using a bearing plate method, wherein the resilience modulus of the top surface of the crushed stone layer shows a value of 104.69 MPa;
the resilience modulus of 15.1MPa of the top surface of the base layer of the original cement concrete plate body before crushing is smaller than the resilience modulus of 104.69MPa of the top surface of the crushed stone layer.
(9) Comparing the average deflection value of the compacted broken stone layer with the average deflection value of the plain cement concrete plate body before breaking;
and comparing that the average deflection value of the plain cement concrete plate body before crushing is 0.12mm less than the average deflection value of the crushed stone layer after compacting is 2.385 mm.
Example 3
A multi-stage rubblization construction method for a pavement comprises the steps of crushing a whole cement concrete slab, and comprises the following steps:
A. preparing before crushing construction;
(1) concealed structures such as culverts, tunnels, underground pipelines, and the like;
(2) the length of a single cement concrete whole plate panel is 5m, the width is 4m, and the thickness of the panel is 25 cm; the average deflection value of a single whole plate of the old pavement is 0.179mm, and the rebound modulus of the top surface of the base layer is 22.1 MPa;
B. crushing construction of the plain cement concrete panel;
(1) adopting multi-hammer crushing equipment to perform overall crushing on the road surface; adjusting the parameters of the multi-hammer head crushing equipment, wherein the height of a drop hammer is 2200ms, and the frequency of the drop hammer is 18 times/minute;
(2) observing that the broken stone layer of the whole broken cement concrete plate has settlement with the settlement depth of 7 cm; the broken stone layer of the whole plain cement concrete plate meets the maximum particle size requirement of 75 percent of guarantee rate;
(3) local crushing of local large concrete blocks on the surface of the rubble layer is carried out by adopting single-hammer crushing equipment;
(4) detecting the resilience modulus of the top surface of the excavated base layer by using a portable drop hammer deflectometer, wherein the display value of the resilience modulus of the top surface of the base layer is 26.5 MPa;
(5) backfilling a gravel layer at a settlement position with graded gravel, and compacting the backfilled graded gravel;
(10) testing the resilience modulus of the top surface of the crushed stone layer by using a bearing plate method, wherein the resilience modulus of the top surface of the crushed stone layer shows a value of 127.95 MPa;
the resilience modulus of 22.1MPa of the top surface of the base layer of the original cement concrete plate body before crushing is smaller than the resilience modulus of 127.95MPa of the top surface of the crushed stone layer.
(11) Comparing the average deflection value of the compacted broken stone layer with the average deflection value of the plain cement concrete plate body before breaking;
comparing that the average deflection value of 0.179mm of the plain cement concrete plate body before crushing is less than the average deflection value of 2.188mm of the crushed stone layer after compacting.
Example 4
A multi-stage rubblizing construction method for a road surface comprises the steps of crushing the plate body fracture part at the periphery of the whole cement concrete plate in the embodiment 1,
① adjusting parameters of the multi-hammer head crushing equipment, and performing secondary crushing construction on the broken part of the cement concrete plate body, wherein the parameters are the height of a drop hammer of 1800ms and the frequency of the drop hammer of 22 times/min;
② removing the broken stone layer at the broken part of the cement concrete plate after the secondary breaking construction;
③ excavating a foundation pit with the total depth of 0.8 m;
④ filling graded broken stone in the foundation pit;
the resilience modulus of the top surface of the base layer before the whole board of the plain cement concrete described in example 1 was crushed was 22.1MPa, the resilience modulus of the top surface of the crushed stone layer of the whole board of the plain cement concrete described in example 1 was 114.06MPa, and the resilience modulus of the top surface of the crushed stone layer at the fracture site of the plate body around the whole board of the plain cement concrete described in example 4 was 125.10 MPa.
The average deflection value of the plain cement concrete plate body before the plain cement concrete plate was crushed in comparative example 1 was 0.163mm, the average deflection value of the crushed stone layer after the plain cement concrete plate was compacted in example 1 was 2.328mm, and the average deflection value of the crushed stone layer at the plate body fracture site around the plain cement concrete plate in example 4 was 2.450 mm.
Example 5
A multi-stage rubblizing construction method for a pavement comprises the steps of crushing the plate body fracture part at the periphery of the whole cement concrete plate in the embodiment 2,
① adjusting parameters of the multi-hammer head crushing equipment, and performing secondary crushing construction on the broken part of the cement concrete plate body, wherein the parameters are the height of a drop hammer of 1800ms and the frequency of the drop hammer of 22 times/min;
② removing the broken stone layer at the broken part of the cement concrete plate after the secondary breaking construction;
③ excavating a foundation pit with the total depth of 0.8 m;
④ filling graded broken stone in the foundation pit;
the resilience modulus of the top surface of the base layer before the whole board of the plain cement concrete described in comparative example 2 was crushed was 15.1MPa, the resilience modulus of the top surface of the crushed stone layer of the whole board of the plain cement concrete described in example 2 was 104.69MPa, and the resilience modulus of the top surface of the crushed stone layer at the fracture site of the plate body in the periphery of the whole board of the plain cement concrete described in example 5 was 115.70 MPa.
The average deflection value of the plain cement concrete plate body before the plain cement concrete plate body was crushed in comparative example 2 was 0.12mm, the average deflection value of the crushed stone layer after the plain cement concrete plate body was compacted in example 2 was 2.385mm, and the average deflection value of the crushed stone layer at the plate body fracture site around the plain cement concrete plate body in example 5 was 2.525 mm.
Example 6
A multi-stage rubblizing construction method for a pavement comprises the steps of breaking the plate body fracture part at the periphery of the whole cement concrete plate in the embodiment 3,
① adjusting parameters of the multi-hammer head crushing equipment, and performing secondary crushing construction on the broken part of the cement concrete plate body, wherein the parameters are the height of a drop hammer of 1800ms and the frequency of the drop hammer of 22 times/min;
② removing the broken stone layer at the broken part of the cement concrete plate after the secondary breaking construction;
③ excavating a foundation pit with the total depth of 0.8 m;
④ filling graded broken stone in the foundation pit;
the resilience modulus of the top surface of the base layer before the whole raw cement concrete slab of example 3 was crushed was 22.1MPa, the resilience modulus of the top surface of the crushed stone layer of the whole raw cement concrete slab of example 3 was 127.95MPa, and the resilience modulus of the top surface of the crushed stone layer at the fracture site of the plate body in the periphery of the whole raw cement concrete slab of example 6 was 137.65 MPa.
The average deflection value of the plain cement concrete plate body before the plain cement concrete plate body was crushed in comparative example 3 was 0.179mm, the average deflection value of the crushed stone layer after the plain cement concrete plate body was compacted in example 3 was 2.188mm, and the average deflection value of the crushed stone layer at the plate body fracture site around the plain cement concrete plate body in example 6 was 2.639 mm.
Example 7
A road surface multistage rubblization construction method comprises the steps of crushing a double-layer reinforced cement panel, and comprises the following steps:
A. preparing before crushing construction;
(1) concealed structures such as culverts, tunnels, underground pipelines, and the like;
(2) the length of the single double-layer reinforced cement whole plate panel is 5m, the width of the single double-layer reinforced cement whole plate panel is 4m, and the thickness of the single double-layer reinforced cement whole plate panel is 25 mm; the average deflection value of a single whole plate of the old pavement is 0.12mm, and the rebound modulus of the top surface of the base layer is 32.8 MPa;
B. carrying out crushing construction on the double-layer reinforced cement panel;
(1) adopting hydraulic punching equipment to punch and presplit the double-layer reinforced cement; and (3) performing a 6 x 10 hole distribution scheme on the single double-layer reinforced cement whole plate, performing hole encryption distribution on the periphery of the single double-layer reinforced cement whole plate, and distributing 68 holes on the single double-layer reinforced cement whole plate.
(2) Adopting multi-hammer crushing equipment to perform overall crushing on the road surface; adjusting parameters of multi-hammer head crushing equipment, wherein the height of a drop hammer is 1800ms, and the frequency of the drop hammer is 20 times/minute;
(3) local crushing of local large concrete blocks on the surface of the rubble layer is carried out by adopting single-hammer crushing equipment;
(4) testing the resilience modulus of the top surface of the crushed stone layer by using a bearing plate method, wherein the resilience modulus of the top surface of the crushed stone layer shows a value of 73.99 MPa;
the rebound modulus of the top surface of the base layer of the double-layer reinforced cement panel before crushing is 32.8MPa and is smaller than the rebound modulus of the top surface of the crushed stone layer of 73.99 MPa.
(5) Comparing the average deflection value of the compacted broken stone layer with the average deflection value of the whole double-layer reinforced cement plate before breaking;
and comparing that the average deflection value of the whole double-layer reinforced cement plate before crushing is 0.12mm less than the average deflection value of the crushed stone layer after compacting is 2.439 mm.
Comparative example 1
A pavement multistage rubblization construction method, the difference of the comparative example 1 and the implementation 7 lies in, the hole number of the hole that adopts the hydraulic pressure perforating equipment to carry on the hole pre-splitting to the double-deck reinforced cement;
A. preparing before crushing construction;
(1) concealed structures such as culverts, tunnels, underground pipelines, and the like;
(2) the length of the single double-layer reinforced cement whole plate panel is 5m, the width of the single double-layer reinforced cement whole plate panel is 4m, and the thickness of the single double-layer reinforced cement whole plate panel is 25 mm; the average deflection value of a single whole plate of the old pavement is 0.133mm, and the rebound modulus of the top surface of the base layer is 33.5 MPa;
B. carrying out crushing construction on the double-layer reinforced cement panel;
(1) adopting hydraulic punching equipment to punch and presplit the double-layer reinforced cement; and (3) performing a hole distribution scheme of 5 × 7 on the single double-layer reinforced cement whole plate, and distributing 35 holes on the single double-layer reinforced cement whole plate.
(2) Adopting multi-hammer crushing equipment to perform overall crushing on the road surface; adjusting parameters of multi-hammer head crushing equipment, wherein the height of a drop hammer is 1800ms, and the frequency of the drop hammer is 20 times/minute;
(3) local crushing of local large concrete blocks on the surface of the rubble layer is carried out by adopting single-hammer crushing equipment;
(4) testing the resilience modulus of the top surface of the crushed stone layer by using a bearing plate method, wherein the display value of the resilience modulus of the top surface of the crushed stone layer is 60.9 MPa;
the rebound modulus of the top surface of the base layer of the two-layer reinforced cement panel of comparative example 1, 60.9MPa, was less than the rebound modulus of the top surface of the base layer of the two-layer reinforced cement panel of example 7, 73.99MPa
(5) The average deflection value of the double-layer reinforced cement panel of the comparative example 1 is compared with the average deflection value of the whole double-layer reinforced cement panel of the example 7;
the average deflection value of 2.286mm of the double-layer reinforced cement panel of the comparative example 1 is smaller than the average deflection value of 2.439mm of the whole double-layer reinforced cement panel of the example 7;
comparative example 2
A pavement multistage rubblization construction method, the difference of comparative example 2 and implementation 7 lies in, adopt the hydraulic pressure perforating equipment to carry on the hole number of hole pre-splitting of perforating to the double-deck reinforced cement;
A. preparing before crushing construction;
(1) concealed structures such as culverts, tunnels, underground pipelines, and the like;
(2) the length of the single double-layer reinforced cement whole plate panel is 5m, the width of the single double-layer reinforced cement whole plate panel is 4m, and the thickness of the single double-layer reinforced cement whole plate panel is 25 mm; the average deflection value of a single whole plate of the old pavement is 0.145mm, and the rebound modulus of the top surface of the base layer is 26.5 MPa;
B. carrying out crushing construction on the double-layer reinforced cement panel;
(1) adopting hydraulic punching equipment to punch and presplit the double-layer reinforced cement; and (3) carrying out a hole distribution scheme of 8 x 11 on the single double-layer reinforced cement whole plate, and distributing 88 holes on the single double-layer reinforced cement whole plate.
(2) Adopting multi-hammer crushing equipment to perform overall crushing on the road surface; adjusting parameters of multi-hammer head crushing equipment, wherein the height of a drop hammer is 1800ms, and the frequency of the drop hammer is 20 times/minute;
(3) local crushing of local large concrete blocks on the surface of the rubble layer is carried out by adopting single-hammer crushing equipment;
(4) testing the resilience modulus of the top surface of the crushed stone layer by using a bearing plate method, wherein the resilience modulus of the top surface of the crushed stone layer shows a value of 68.59 MPa;
the rebound modulus of the top surface of the base layer of the two-layer reinforced cement panel of comparative example 1 was 68.59MPa which is smaller than the rebound modulus of the top surface of the base layer of the two-layer reinforced cement panel of example 7, which is 73.99MPa
(5) The average deflection value of the double-layer reinforced cement panel of the comparative example 1 is compared with the average deflection value of the whole double-layer reinforced cement panel of the example 7;
the average deflection value of 2.250mm of the double-layer reinforced cement panel of the comparative example 1 is less than the average deflection value of 2.439mm of the whole double-layer reinforced cement panel of the example 7;
the invention has the beneficial effects that:
the invention provides a multilevel rubblization construction method for a road surface, which respectively provides targeted construction methods aiming at two structural forms of plain cement concrete and double-layer reinforced cement of the existing concrete road surface, the whole construction process is suitable for the transformation process of most old concrete road surfaces, the rubblization process is optimized, a combined rubblization scheme of hydraulic hammer drilling and pre-splitting and multi-hammer head crushing is determined, a targeted transformation scheme is provided for a staggered severe road section and a broken plate severe road section, and a transformation scheme which can be used for large-scale construction is established and a construction guide scheme is established.
The construction process design is carried out aiming at the whole plate structure of the plain cement concrete panel, the construction requirement on whole plate crushing is low, the construction speed is high, and the construction efficiency is high; meanwhile, the process design of important construction nodes is carried out on local plate body fracture areas which are easily generated by the plain cement concrete, so that the broken plain cement concrete has stronger structural performance, the nodes with defects in the original roadbed are reinforced in strength, and the broken plain cement concrete has higher strength after being subjected to pavement breaking treatment.
The hydraulic punching equipment and the multi-hammer crushing equipment are matched for use, the number of holes formed in the hydraulic punching equipment is scientifically and reasonably planned, the strength of the crushed double-layer reinforced cement concrete is improved, the double-layer reinforced cement concrete is crushed more uniformly in the construction process, and the construction process is reasonable.
The single-hammer crusher is used for crushing local large concrete in a crushed stone layer of multi-concrete after large-scale equipment crushing, replaces manual operation with a handheld electric tool to perform the process operation, and is compact in structure, convenient to transport and flexible in use.
The multistage rubblization process method has the advantages of strong adaptability, short process flow and reduction of the overall construction cost.
Claims (8)
1. A road surface multistage rubblization construction method is characterized by comprising the following steps:
A. preparing before crushing construction;
(1) investigating, marking, analyzing and judging hidden structures such as culverts, channels, underground pipelines and the like around the broken pavement;
(2) grasping relevant parameters such as the damage condition, the thickness, the size of each plate and the like of the old pavement;
① selecting a crushing test road section, and carrying out detailed measurement and setting on road conditions (crack length, width, number and the like) and elevation before crushing.
② coring the old cement concrete panel and the base layer on site, and testing the splitting strength and the unconfined compressive strength;
(3) draining water on the broken pavement in an open ditch or broken stone blind ditch mode;
B. crushing construction of the plain cement concrete panel;
(1) adopting multi-hammer crushing equipment to perform overall crushing on the road surface;
(2) observing whether the crushed stone layer of the whole plain cement concrete slab is settled or not and whether the crushed stone layer of the whole plain cement concrete slab meets the maximum particle size requirement of 75% of guarantee rate or not;
(3) local crushing is carried out on the large concrete blocks which are not crushed locally on the surface of the rubble layer by adopting single-hammer crushing equipment;
(4) detecting the resilience modulus of the top surface after rubblization by using a portable drop hammer deflectometer;
(5) crushing the fracture part of the plain cement concrete plate;
① adjusting parameters of the hammerhead of the multi-hammerhead crushing equipment, and performing secondary crushing construction on the broken part of the cement concrete plate;
② removing the broken stone layer at the broken part of the cement concrete plate after the secondary breaking construction;
③ backfilling the abnormal part with graded broken stone;
(6) backfilling graded broken stones at the settlement position of more than 5cm, and compacting the backfilled graded broken stones;
(7) testing the resilience modulus of the top surface of the crushed stone layer by using a bearing plate method;
(8) comparing the average deflection value of the compacted broken stone layer with the average deflection value of the plain cement concrete plate body before breaking;
C. carrying out crushing construction on the double-layer reinforced cement panel;
(1) adopting hydraulic punching equipment to punch and presplit the double-layer reinforced cement;
(2) adopting multi-hammer crushing equipment to perform overall crushing on the road surface;
(3) local crushing of local large concrete blocks on the surface of the rubble layer is carried out by adopting single-hammer crushing equipment;
(4) backfilling graded broken stones by adopting the graded broken stones to form an obviously settled broken stone layer after crushing, and compacting the backfilled graded broken stones;
(5) testing the resilience modulus of the top surface of the crushed stone layer by using a bearing plate method;
(6) comparing the average deflection value of the compacted broken stone layer with the average deflection value of the double-layer reinforced cement panel before breaking;
D. subsequent treatment;
(1) surface treatment; spreading emulsified asphalt priming oil on the surfaces of broken and compacted plain cement concrete and double-layer reinforced cement rubblized layers;
(2) protecting a finished product; enclosing and sealing the crushed site;
(3) secondary repair; after the compacted broken stone layer is damaged by vehicles, secondary compaction repair is carried out;
(4) rain protection; and adopting waterproof cloth to cover and protect the crushed stone layer.
2. The multi-stage road rubblizing construction method according to claim 1, wherein the single-hammer head crushing equipment comprises a frame body, universal casters, driving casters, caster shafts, driven gears, caster motors, driving gears, a bottom plate, a transverse plate, lifting support legs, support leg hydraulic rods, a top plate, a lifting motor, a lifting reel, a fixed pulley, a top hydraulic rod, a movable plate, a sheath cylinder, a hammer body and a lifting rope; the universal casters are arranged at two ends of one side of the bottom surface of the frame body; the driving trundles are arranged at two ends of the other side of the top surface of the frame body, the trundles at the two ends coaxially rotate through trundle shafts, and the driven gears are arranged on the trundle shafts; the caster motor is fixed on one side of the bottom surface of the frame body, the driving gear and the caster motor rotate coaxially, and the driving gear and the driven gear are in meshing transmission; the transverse rods on the two sides of the frame body are in a groove shape to form a bottom plate clamping groove, the bottom plate is embedded into the bottom plate clamping groove, and one side of the bottom plate is in a transverse opening-shaped structure to form a bottom plate opening; the transverse plates are arranged at the middle ends of the two sides of the frame body, the lifting support legs are arranged at the two sides of the frame body and are rotatably arranged with the transverse plates through movable hinges, and the support leg hydraulic rods are arranged at the bottom ends of the lifting support legs; the top plate is arranged on the top surface of the frame body, the hoisting motor is fixed to the top end of one side of the frame body through a hoisting motor support, and the hoisting reel is arranged on the top surface of the hoisting motor support and is driven to rotate through the hoisting motor; the fixed pulley is arranged on the top surface of the top plate and is fixed with the top plate through a fixed pulley bracket; the top hydraulic rod is arranged on the bottom surface of the top plate; the movable plate is fixed on the bottom surface of the top hydraulic rod, and the protective sleeve is fixed on the bottom surface of the movable plate through bolts; the hammer block is arranged in the sheath cylinder, one end of the lifting rope is fixed to the top end of the hammer block, and the other end of the lifting rope penetrates through the top plate and bypasses the fixed pulley to be fixed with the lifting reel.
3. The multi-stage road rubblizing construction method according to claim 1, wherein aggregate with aggregate particle size of less than 26.5mm accounts for 100% of the total mass of the graded aggregate; the aggregate with the aggregate particle size of less than 19.0mm accounts for 100-95% of the total mass of the graded aggregate; aggregates with the aggregate particle size of less than 13.2mm account for 70-79% of the total mass of the graded aggregates; aggregates with the aggregate particle size of less than 4.75mm account for 40-30% of the total mass of the graded aggregates; the aggregate with the aggregate particle size of less than 1.18mm accounts for 12-20% of the total mass of the graded aggregate; aggregates with the aggregate particle size of less than 0.3mm account for 5-10% of the total mass of the graded aggregates; the aggregate with the aggregate particle size of less than 0.075mm accounts for 2-5% of the total mass of the graded aggregate.
4. The multilevel rubblizing construction method for road surface according to claim 1, wherein in the (5) th strip ③ of the step C, the foundation pit is in a layered platform-like structure, the top side of the foundation pit extends outward in the circumferential direction, and the side wall of the bottom surface of the foundation pit is in a slope shape.
5. The multi-stage rubblizing construction method for pavement according to claim 1, characterized in that the structure of the rubble layer forms rubble grading from top to bottom, the maximum particle size of 75% of the area of the top of the rubble layer is less than or equal to 7.5cm, the maximum particle size of the middle of the rubble layer is less than or equal to 22.5cm, the maximum particle size of the bottom of the rubble layer is less than or equal to 37.5cm, and the top, the middle and the bottom of the rubble layer form continuous grading with cracks and no crumbles.
6. The multi-stage rubblized pavement construction method according to claim 1, wherein the compaction modes are all compaction sequentially by a Z-shaped roller and a smooth-wheel roller, and the compaction times of each device are three times.
7. The multi-stage rubblizing construction method for road surface according to claim 1, wherein the compacting device wets both the vegetal cement concrete rubble layer and the double reinforced cement rubble layer in the first and third compacting processes.
8. The multi-stage rubblizing construction method for road surface according to claim 1, wherein the emulsified asphalt priming oil spread on the surface is spread with 50% slow-breaking emulsified asphalt according to the dosage of 2.5-3.5 (kg/square meter).
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