CN115142388A - Aqueduct concrete composite road mold construction method - Google Patents
Aqueduct concrete composite road mold construction method Download PDFInfo
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- CN115142388A CN115142388A CN202210832064.2A CN202210832064A CN115142388A CN 115142388 A CN115142388 A CN 115142388A CN 202210832064 A CN202210832064 A CN 202210832064A CN 115142388 A CN115142388 A CN 115142388A
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- 238000010276 construction Methods 0.000 title claims abstract description 59
- 239000002131 composite material Substances 0.000 title claims abstract description 55
- 239000000945 filler Substances 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 239000000758 substrate Substances 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 58
- 239000010959 steel Substances 0.000 claims description 58
- 238000005096 rolling process Methods 0.000 claims description 42
- 238000000034 method Methods 0.000 claims description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 239000002689 soil Substances 0.000 claims description 22
- 239000002023 wood Substances 0.000 claims description 15
- 238000013461 design Methods 0.000 claims description 10
- 230000002787 reinforcement Effects 0.000 claims description 9
- 238000007689 inspection Methods 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000005056 compaction Methods 0.000 claims description 6
- 238000009415 formwork Methods 0.000 claims description 6
- 238000009490 roller compaction Methods 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000000889 atomisation Methods 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 claims description 3
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims 4
- 238000012423 maintenance Methods 0.000 claims 2
- 240000000491 Corchorus aestuans Species 0.000 claims 1
- 235000011777 Corchorus aestuans Nutrition 0.000 claims 1
- 235000010862 Corchorus capsularis Nutrition 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 claims 1
- 238000009991 scouring Methods 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 abstract description 6
- 230000002349 favourable effect Effects 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 59
- 238000005259 measurement Methods 0.000 description 9
- 238000005507 spraying Methods 0.000 description 4
- 238000007788 roughening Methods 0.000 description 3
- 230000001680 brushing effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B5/00—Artificial water canals, e.g. irrigation canals
- E02B5/02—Making or lining canals
-
- 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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
-
- 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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/50—Removable forms or shutterings for road-building purposes; Devices or arrangements for forming individual paving elements, e.g. kerbs, in situ
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The invention relates to the technical field of constructional engineering, and particularly provides a construction method of a aqueduct concrete composite road mold, which comprises the following steps: step S1, substrate treatment: cleaning sundries in a filling area of the aqueduct, and leveling uneven base planes in the filling area; s2, measuring and lofting: discharging the side lines and the axes of each layer of the composite road mold to be filled, and calibrating the filling elevation of each layer; marking a plurality of measuring point positions for each filling layer, and marking measuring point coordinates and numbering; according to the invention, the aqueduct is filled in a layered filling mode, so that the high-altitude construction safety coefficient is improved, and the construction potential safety hazard is avoided; the trouble that the support is dismantled is avoided installing, it is comparatively simple to set up the compound road mould and demolish compound road mould operation relatively, is favorable to having improved the construction progress, practices thrift the time limit for a project, and has reduced manual work, material and mechanical expense, is favorable to reducing construction cost, and the filler can repeatedly be recycled, avoids extravagant.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a construction method of a aqueduct concrete composite road mold.
Background
In recent years, the investment of China in water conservancy facilities is increased year by year, and particularly, diversion engineering projects are more and the scale is larger and larger. Aqueduct is an overhead water-transporting structure for transporting water flow of channels across rivers, channels, roads, mountain rushes, valley mouths and the like, and is one of the most widely used cross buildings in canal system buildings.
At present, the length of an aqueduct is generally longer, the aqueduct can span across the soil of a kilometer, in the prior art, the aqueduct is usually constructed by a mode of erecting a template support, the aqueduct belongs to high-altitude construction, the construction mode has lower safety coefficient, great construction potential safety hazard exists, the operation of removing the support by installing the support is more complex, the construction time is longer, the engineering progress is slow, and the construction efficiency of the aqueduct is invisibly reduced.
Disclosure of Invention
The invention aims to solve the problems that the aqueduct is generally constructed by adopting a mode of erecting a template bracket, the safety risk is higher, the construction time is longer, and the construction efficiency of the aqueduct is reduced.
The invention provides the following technical scheme:
a aqueduct concrete composite road mold construction method comprises the following steps:
step S1, substrate treatment: cleaning sundries in a filling area of the aqueduct, and leveling a bumpy base plane in the filling area;
s2, measuring and lofting: discharging the side line and the axis of each filling layer of the composite road mold, and calibrating the elevation of each filling layer; marking a plurality of measuring point positions on each filling layer, and marking measuring point coordinates and numbering;
s3, layered filling: firstly, filling the lower layer, paving filler, adopting a 'filling method' to pave and level, then rolling, adopting a 'advancing and retreating staggered distance method' to roll uniformly, and filling the upper filling layer after the lower filling layer is qualified;
step S4, quality inspection: performing quality inspection on the filler of the filling layer, and sampling every 200-400m 3 Sampling once, wherein each filling layer is not less than 3 points, and continuously paving and filling until a foundation is formed by a plurality of filling layers after the filling layers are qualified;
step S5, preloading: laying a geogrid on the foundation, piling and loading stone slag on the geogrid to fill a trapezoidal section, carrying out detailed settlement and displacement observation in the piling and loading process, and unloading after settlement meets requirements;
s6, assembling the composite road mold: firstly, paving a bottom die structure on the foundation, wherein the bottom die structure comprises a leveling layer, a wood template, PVC floor paper and a release agent, pouring a layer of concrete on the foundation as the leveling layer, paving a layer of the wood template on the leveling layer, adhering a layer of the PVC floor paper on the wood template, and coating a layer of the release agent as a wood template separant;
assembling side molds, wherein the side molds are assembled by using customized steel molds and are installed block by block along the outer side line of the aqueduct body, and after the side molds are installed, the bottom mold structure and the side molds are integrally assembled to form the composite road mold;
s7, installing a steel reinforcement framework: the steel bar framework comprises bottom row steel bars, steel bar split heads, positioning steel bars and upper layer steel bars, mounting position lines are popped up on the composite road mold before construction, the bottom row steel bars are mounted on the composite road mold according to the mounting position lines and are padded up by concrete cushion blocks and are arranged in a plum blossom shape, the steel bar split heads are placed on the bottom row steel bars after the bottom row steel bars are bound, the bottoms of the steel bar split heads and the bottom row steel bars are fixed in a spot welding manner, the positioning steel bars are longitudinally or transversely fixed on the steel bar split heads, and then the upper layer steel bars are bound;
step S8, pouring concrete: the concrete of the aqueduct body is poured by adopting a horizontal layering method, and the concrete of the side wall of the aqueduct is symmetrically poured; a manual material shoveling and leveling bin is assisted at a position close to the wood formwork and the steel reinforcement framework, and then a vibrator is adopted for vibrating;
step S9, excavating the composite road mold: after pouring is finished, excavating the composite road mold after the strength of concrete in the aqueduct reaches the design requirement, wherein the excavating sequence of the composite road mold is carried out from the midspan to the two ends, and the soil within 1m close to the groove pier and the groove bottom of the aqueduct is excavated manually; and after the filler excavation and transportation are finished, restoring the original appearance of the surrounding environment.
Compared with the prior art, the aqueduct concrete composite road mold construction method provided by the invention has the following beneficial effects that:
filling in layers, rolling in layers to the designed bottom elevation position of the aqueduct, rolling to compact to form a road, using the road as the construction working surface of the aqueduct structure, hardening concrete at the position of the aqueduct body, paving PVC floor paper to form a bottom die structure, erecting dies at two sides to form a composite road die, pouring aqueduct concrete, and dismantling the composite road die after the pouring is finished; in the construction process, the aqueduct is filled in a layered filling mode, so that the high-altitude construction safety coefficient is improved, and the construction potential safety hazard is avoided; the trouble that the support is dismantled to the installing support is avoided, set up the compound road mould relatively and demolish the compound road mould operation comparatively simple, be favorable to improving the construction progress, practice thrift the time limit for a project, and reduced manual work, material and mechanical cost, be favorable to reducing construction cost, the filler can repeatedly be recycled, avoids extravagant.
Preferably, in the step S1, a stable area is selected at the periphery of the filling area according to the extending direction of the aqueduct, at least three measurement control points are buried in the stable area, the measurement control points are used for measuring in the construction process and settling and tamping a base surface, leveling filler is paved on the base surface, the thickness of the leveling filler is 20-30cm, the leveling filler is ground and pressed for 2 times by vibration and static pressure and 4-6 times by vibration, and after the compaction degree is detected to be not less than 91%, the leveling filler is swept by a bulldozer and a grader.
Preferably, in step S3, the filler with the moisture content meeting the requirement is transported to the filling area, and the over-wet soil is loosened and dried, or the over-dry soil is uniformly added with water, so that the moisture content of the over-wet soil is close to the moisture content range meeting the requirement;
the 'occupancy method' is adopted for paving and feeding, the digging machine is adopted for paving and leveling, the elevation calibrated by measurement is used, the thickness of the paving material is measured with a line, and the leveling machine is adopted for leveling the position which does not meet the thickness requirement of the paving material.
Preferably, in step S3, after the paving and leveling are completed, and the loose paving thickness and the flatness meet the filling requirement, 22t smooth surface vibration rolling is adopted, the rolling adopts a "advancing and retreating offset method", the speed of a vibration rolling vehicle is 2.0-3.0km/h, a specially-assigned person is responsible for recording the rolling times and the running speed in the rolling process, the tracks of the two times before and after the compaction are transversely overlapped by not less than 30cm, no corner leakage or dead angle is required to be formed in the rolling, and the rolling uniformity is ensured;
the rolling procedure is as follows: carrying out static pressure for 2 times and then vibrating and pressing for 4 times;
rolling 1m close to the groove pier by using a 4t small-sized road roller, and tamping 0.2m close to the groove pier by using a vibration tamping machine; the roller compaction has no corner leakage and dead angle, and the roller compaction is ensured to be uniform.
Preferably, in step S4, sampling the suspicious site by spot inspection, measuring the dry volume weight water content, reporting to a supervision engineer for acceptance after qualification, immediately loosening the unqualified person, rolling again, and continuing to pave and fill the soil until the unqualified person is qualified.
Preferably, in step S7, when the bottom row of steel bars and the upper layer of steel bars are bound, every point of the intersection of two lines near the periphery is bound, the middle part is bound in a quincunx shape, and full binding is performed under bidirectional stress.
Preferably, in step S8, the concrete of the aqueduct body is poured first, and the thickness of the concrete of the aqueduct body is 40cm, and the pouring is completed at one time;
symmetrically pouring concrete on the side wall of the aqueduct according to a layer with the thickness of 35 cm;
unqualified concrete is strictly forbidden to be put into a warehouse, and unqualified materials which are put into the warehouse must be removed.
Preferably, in step S8, the vibrator used for vibrating by using a vibrator is an inserted type lengthened vibrator rod of 2.2kW, and the vibrator cannot directly collide with the composite road form, the reinforcement cage and the embedded part to prevent the composite road form from deforming and the embedded part from shifting;
the vibration time is based on that the concrete does not obviously sink any more, no bubble appears and the slurry begins to spread; the distance of the vibrator moving is not more than 1.5 times of the effective radius of the vibrator, the vibrator is inserted into the lower layer for 5-10cm, the vibrating is sequentially carried out in the same direction, the vibrator is inserted quickly and pulled slowly, the combination of the upper layer and the lower layer of the concrete is ensured, and the leakage vibration and the over-vibration are avoided.
Preferably, in step S8, the concrete pouring is continuously performed for a construction joint treatment, and the formed construction joint treatment is performed by dividing the joint into blocks according to design and construction condition restrictions, mainly by using a defeather, and by using a manual hacking.
Preferably, in step S8, water spraying and curing are started after concrete pouring is finished for 10-12 h, water is sprayed in advance in hot and dry weather, or a method combining constant current atomization and manual water spraying is adopted, during operation, the side surface is sprayed first, the top surface is sprayed with water after hair brushing, and curing on the exposed horizontal surface is covered by a wet gunny bag (or felt);
the curing period is 7 days or days indicated by a supervision engineer, the important part is not less than 14 days, the curing water is clean and does not corrode the concrete, the watering curing is adopted, and the strength of the concrete of the aqueduct reaches the design requirement.
Drawings
Fig. 1 is a schematic flow chart of a aqueduct concrete composite road form construction method according to an embodiment of the invention;
fig. 2 is a schematic view of a layered filling structure according to an embodiment of the present invention.
Description of reference numerals:
the device comprises a shell 1, a first mounting cavity 11, a second mounting cavity 12, an air inlet 13, a water receiving cavity 14, a mounting platform 15, a supporting platform 16, an air outlet 17, a water through hole 18, a partition plate 2, a vent 21, a flow channel 22, an outlet 23, a connecting plate 3, a water discharging plate 4, a mounting plate 5, a mounting port 50, an evaporator 6, a warm air heater 7 and an evaporation fan 8.
Detailed Description
Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Referring to fig. 1-2, the aqueduct concrete composite road form construction method provided by the invention comprises the following steps:
step S1, substrate treatment: cleaning sundries in a filling area of the aqueduct, and leveling a bumpy base plane in the filling area;
referring to fig. 2, step S2, measurement lofting: discharging the side line and the axis of each filling layer of the composite road mold, and calibrating the elevation of each filling layer; marking a plurality of measuring points on each filling layer, marking measuring point coordinates and numbering;
step S3, layered filling: firstly, filling the lower layer, paving filler, adopting a 'filling method' to pave and level, then rolling, adopting a 'advancing and retreating staggered distance method' to roll uniformly, and filling the upper filling layer after the lower filling layer is qualified;
step S4, quality inspection: performing quality inspection on the filler of the filling layer, and sampling every 200-400m 3 Sampling once, wherein each filling layer is not less than 3 points, and continuously paving and filling until a foundation is formed by a plurality of filling layers after the filling layers are qualified;
step S5, preloading: laying a geogrid on the foundation, stacking stone ballast on the geogrid to fill a trapezoidal section, carrying out detailed settlement and displacement observation in the stacking process, and unloading after settlement meets the requirement;
wherein, lay geogrid to guarantee wholeness and stability, the ballast of pre-compaction accords with the designing requirement, and the heap is carried the ballast is filled into trapezoidal section, and the portion of should piling up earlier during filling, then level is filled layer by layer to ensure the side slope stability. And in the process of the layered preloading filling of the composite road mold and in the preloading period after the filling is finished, carrying out detailed settlement and displacement observation according to the frequency required by design, carrying out settlement analysis after the specified preloading time is reached, analyzing and evaluating the settlement stability, and unloading after the settlement meets the requirement.
S6, assembling the composite road mold: firstly, paving a bottom die structure on the foundation, wherein the bottom die structure comprises a leveling layer, a wood template, PVC floor paper and a release agent, pouring a layer of concrete on the foundation as the leveling layer, paving a layer of the wood template on the leveling layer, sticking a layer of the PVC floor paper on the wood template, and smearing a layer of the release agent as a wood template separant;
then assembling side dies, assembling the side dies by using customized steel dies, installing the side dies block by block along the outer side line of the body of the aqueduct, and after the side dies are installed, integrally assembling the bottom die structure and the side dies to form the composite road die;
s7, installing a steel reinforcement framework: the steel bar framework comprises bottom row steel bars, steel bar split heads, positioning steel bars and upper layer steel bars, mounting position lines are popped up on the composite road mold before construction, the bottom row steel bars are mounted on the composite road mold according to the mounting position lines and are padded up by concrete cushion blocks and are arranged in a plum blossom shape, the steel bar split heads are placed on the bottom row steel bars after the bottom row steel bars are bound, the bottoms of the steel bar split heads and the bottom row steel bars are fixed in a spot welding manner, the positioning steel bars are longitudinally or transversely fixed on the steel bar split heads, and then the upper layer steel bars are bound;
step S8, pouring concrete: the concrete of the aqueduct body is poured by adopting a horizontal layering method, and the concrete of the side wall of the aqueduct is symmetrically poured; a manual material shoveling and leveling bin is assisted at a position close to the wood formwork and the steel reinforcement framework, and then a vibrator is adopted for vibrating;
step S9, excavating the composite road mold: after pouring is finished, excavating the composite road model after the strength of concrete in the aqueduct reaches design requirements, wherein the excavating sequence of the composite road model is carried out from midspan to two ends, soil within 1m close to a groove pier and a groove bottom of the aqueduct is excavated manually; and after the filler excavation and transportation are finished, restoring the original appearance of the surrounding environment.
In the embodiment, the method comprises the steps of filling in layers, rolling in layers to the designed bottom elevation position of the aqueduct, rolling and compacting to form a road to be used as the construction working surface of the aqueduct structure, hardening concrete and paving PVC floor paper at the position of the aqueduct body of the aqueduct to form a bottom die structure, erecting side dies at two sides to form the composite road die, pouring aqueduct concrete, and dismantling the composite road die after pouring is finished; in the construction process, the aqueduct is filled in a layered filling mode, so that the high-altitude construction safety coefficient is improved, and the construction potential safety hazard is avoided; the trouble that the support is dismantled to the installing support is avoided, set up the compound road mould relatively and demolish the compound road mould operation comparatively simple, be favorable to improving the construction progress, practice thrift the time limit for a project, and reduced manual work, material and mechanical cost, be favorable to reducing construction cost, the filler can repeatedly be recycled, avoids extravagant.
Preferably, in the step S1, a stable area is selected at the periphery of the filling area according to the extending direction of the aqueduct, at least three measurement control points are buried in the stable area, the measurement control points are used for measuring in the construction process and settling and tamping a base surface, leveling filler is paved on the base surface, the thickness of the leveling filler is 20-30cm, the leveling filler is ground and pressed for 2 times by vibration and static pressure and 4-6 times by vibration, and after the compaction degree is detected to be not less than 91%, the leveling filler is swept by a bulldozer and a grader.
Specifically, before step S1, a filling elevation and an ultrahigh value are calculated according to the construction technical parameters of the aqueduct; determining the volume of the required fill, selecting a soil source, selecting proper transportation, paving and rolling equipment, and determining construction parameters such as a loose paving coefficient, rolling times, rolling speed and the like through tests; and carrying out technical background and safety education on site participated constructors and implementing the operation rules of mechanical equipment.
In the embodiment, the measurement control point is arranged for measurement operation and settlement observation in the construction process; and in the leveling and rolling processes, a drainage guide facility of the foundation surface is required to be made, so that the influence on a peripheral water system is minimized, and the foundation surface of the composite road mold and the surface of the later filling layer are prevented from being soaked by water.
Preferably, in step S3, the filler with the water content meeting the requirement is transported to the filling area, and the over-wet soil is loosened and dried, or water is uniformly added to the over-dry soil, so that the water content of the filler is close to the range of the water content meeting the requirement;
the 'occupancy method' is adopted for paving and feeding, the digging machine is adopted for paving and leveling, the elevation calibrated by measurement is used, the thickness of the paving material is measured with a line, and the leveling machine is adopted for leveling the position which does not meet the thickness requirement of the paving material.
Preferably, in step S3, after the paving and leveling are completed, and the loose paving thickness and the flatness meet the filling requirements, 22t of smooth surface vibration rolling is adopted, the rolling adopts a 'advancing and retreating offset method', the speed of a vibration rolling vehicle is 2.0-3.0km/h, a specially-assigned person is responsible for recording the rolling times and the running speed in the rolling process, the tracks of the two times before and after the compaction are transversely overlapped by not less than 30cm, no corner leakage or dead angle is required to be formed in the rolling, and the rolling is ensured to be uniform;
the rolling procedure is as follows: carrying out static pressure for 2 times and then vibrating and pressing for 4 times;
rolling 1m close to the groove pier by using a 4t small-sized road roller, and tamping 0.2m close to the groove pier by using a vibration tamping machine; the roller compaction has no corner leakage and dead angle, and the roller compaction is ensured to be uniform.
Specifically, loose soil and sundries scattered on a filling surface feeding transportation line and a dry and hard smooth surface formed by vehicle running and manual trampling are removed or thoroughly treated before soil paving; when the phenomena of 'springs', polished surfaces between layers, hollow spaces between layers, loose soil layers or shear failure and the like occur in the filled soil, the filled soil is carefully treated according to specific conditions and is inspected to be qualified, and then new soil is accurately paved.
When the filling operation is carried out in rainy or snowy weather, a protective layer is laid on the filled surface or covered by a waterproof material, the filling surface is removed when the filling operation is carried out again, and the filling surface is inspected. The surface of the soil layer is air-dried when the machine is stopped for a short time, and the water content is kept within the control range after the machine is sprayed with water and is wetted.
Preferably, in step S4, sampling the suspicious site by spot inspection, measuring the dry volume weight water content, reporting to a supervision engineer for acceptance after qualification, immediately loosening the unqualified person, rolling again, and continuing to pave and fill the soil until the unqualified person is qualified.
Preferably, in step S7, when the bottom row of steel bars and the upper layer of steel bars are bound, every point of the intersection of two lines close to the periphery is bound, the middle part is bound in a quincunx shape, and full binding is performed under bidirectional stress.
Preferably, the concrete of the aqueduct body is poured firstly, the thickness of the concrete of the aqueduct body is 40cm, and the pouring is finished at one time;
symmetrically pouring concrete on the side wall of the aqueduct according to a layer with the thickness of 35 cm;
unqualified concrete is strictly forbidden to be put into a warehouse, and unqualified materials which are put into the warehouse must be removed.
Preferably, in step S8, the vibrator used for vibrating by using a vibrator is an inserted type lengthened vibrator rod of 2.2kW, and the vibrator cannot directly collide with the composite road form, the reinforcement cage and the embedded part to prevent the composite road form from deforming and the embedded part from shifting;
the vibration time is based on that the concrete does not obviously sink any more, no bubble appears and the slurry begins to spread; the distance of the vibrator moving is not more than 1.5 times of the effective radius of the vibrator, the vibrator is inserted into the lower layer for 5-10cm, the vibrating is sequentially carried out in the same direction, the vibrator is inserted quickly and pulled slowly, the combination of the upper layer and the lower layer of the concrete is ensured, and the leakage vibration and the over-vibration are avoided.
Specifically, when concrete is poured, water is strictly forbidden to be added into a bin, the workability is found to be poor, and the quality of the concrete is ensured by adopting a method of reinforcing vibration.
The vibrating time must be reasonably mastered when the concrete is vibrated, and the optimal time for finishing vibrating is that the concrete surface is overflowed and bubbles do not emerge any more.
Preferably, in step S8, the concrete pouring is continuously performed for more than an allowable interval time, the construction joint is divided into blocks according to the design and the construction condition, and the method of forming the construction joint is mainly performed by the roughening of the roughening machine and is assisted by the artificial roughening.
Preferably, in step S8, water spraying and curing are started after concrete pouring is finished for 10-12 h, water is sprayed in advance in hot and dry weather, or a method combining constant current atomization and manual water spraying is adopted, during operation, the side surface is sprayed first, the top surface is sprayed with water after hair brushing, and curing on the exposed horizontal surface is covered by a wet gunny bag (or felt);
the curing period is 7 days or days indicated by a supervision engineer, the important part is not less than 14 days, the curing water is clean and does not corrode the concrete, the watering curing is adopted, and the strength of the concrete of the aqueduct reaches the design requirement.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. A aqueduct concrete composite road mold construction method is characterized by comprising the following steps:
step S1, substrate treatment: cleaning sundries in a filling area of the aqueduct, and leveling a bumpy base plane in the filling area;
s2, measuring and lofting: discharging the side line and the axis of each filling layer of the composite road mold, and calibrating the elevation of each filling layer; marking a plurality of measuring point positions on each filling layer, and marking measuring point coordinates and numbering;
s3, layered filling: firstly, filling the lower layer, paving filler, leveling by adopting a 'take-in method', then rolling, uniformly rolling by adopting a 'advancing and retreating staggered distance method', and filling the upper filling layer after the lower filling layer is qualified;
step S4, quality inspection: performing quality inspection on the filler of the filling layer, and sampling every 200-400m 3 Sampling once, wherein each filling layer is not less than 3 points, and continuously paving and filling until a foundation is formed by a plurality of filling layers after the filling layers are qualified;
step S5, preloading: laying a geogrid on the foundation, stacking stone ballast on the geogrid to fill a trapezoidal section, carrying out detailed settlement and displacement observation in the stacking process, and unloading after settlement meets the requirement;
s6, assembling the composite road mold: firstly, paving a bottom die structure on the foundation, wherein the bottom die structure comprises a leveling layer, a wood template, PVC floor paper and a release agent, pouring a layer of concrete on the foundation as the leveling layer, paving a layer of the wood template on the leveling layer, sticking a layer of the PVC floor paper on the wood template, and smearing a layer of the release agent as a wood template separant;
assembling side molds, wherein the side molds are assembled by using customized steel molds and are installed block by block along the outer side line of the aqueduct body, and after the side molds are installed, the bottom mold structure and the side molds are integrally assembled to form the composite road mold;
s7, installing a steel reinforcement framework: the steel bar framework comprises bottom row steel bars, steel bar split heads, positioning steel bars and upper layer steel bars, mounting position lines are popped up on the composite road formwork before construction, the bottom row steel bars are mounted on the composite road formwork according to the mounting position lines and are padded up by concrete cushion blocks and are arranged in a plum blossom shape, after the bottom row steel bars are bound, the steel bar split heads are placed on the bottom row steel bars, the bottoms of the steel bar split heads are fixed with the bottom row steel bars in a spot welding manner, the positioning steel bars are longitudinally or transversely fixed on the steel bar split heads, and then the upper layer steel bars are bound;
step S8, pouring concrete: the concrete of the aqueduct body is poured by adopting a horizontal layering method, and the concrete of the side wall of the aqueduct is symmetrically poured; a manual material shoveling and leveling bin is assisted at a position close to the wood formwork and the steel reinforcement framework, and then a vibrator is adopted for vibrating;
step S9, excavating the composite road mold: after pouring is finished, excavating the composite road mold after the strength of concrete in the aqueduct reaches the design requirement, wherein the excavating sequence of the composite road mold is carried out from the midspan to the two ends, and the soil within 1m close to the groove pier and the groove bottom of the aqueduct is excavated manually; and after the filler excavation and transportation are finished, restoring the original appearance of the surrounding environment.
2. The aqueduct concrete composite road-form construction method as claimed in claim 1, further comprising selecting a stable area around the filling area according to the extending direction of the aqueduct in step S1, burying at least three measuring control points in the stable area, wherein the measuring control points are used for measuring and settling a tamping base surface in the construction process, paving a leveling filler on the base surface, wherein the thickness of the leveling filler is 20-30cm, grinding and static pressing for 2 times by vibration, pressing for 4-6 times by vibration, and leveling by a bulldozer and a grader after detecting that the degree of compaction is not less than 91%.
3. The aqueduct concrete composite road mold construction method as claimed in claim 1, wherein in step S3, the filler with the moisture content meeting the requirement is transported to the filling area, and the over-wet soil is loosened and dried, or the over-dry soil is uniformly added with water, so that the moisture content is close to the range of the moisture content meeting the requirement;
the spreading and feeding adopt a 'occupation method', the spreading and leveling are carried out by adopting an excavator, the measured and calibrated elevation is used, the thickness of the spreading material is measured by a belt line, and the leveling is carried out by adopting a grader at the position which does not meet the thickness requirement of the spreading material.
4. The aqueduct concrete composite road mold construction method according to claim 1, characterized in that in step S3, after the paving and leveling are completed, and the loose paving thickness and the flatness meet the filling requirements, 22t smooth surface vibration rolling is adopted, the rolling adopts a 'advancing and retreating offset method', the speed of a vibration rolling vehicle is 2.0-3.0km/h, a specially-assigned person is responsible for recording the rolling times and the running speed in the rolling process, the tracks of two times of transverse overlapping before and after the rolling are not less than 30cm, no leakage angle and no dead angle are required to be achieved in the rolling, and the rolling is ensured to be uniform;
the rolling procedure is as follows: carrying out static pressure for 2 times and then vibrating and pressing for 4 times;
rolling 1m close to the groove pier by using a 4t small-sized road roller, and tamping 0.2m close to the groove pier by using a vibration tamping machine; the roller compaction has no corner leakage and dead angle, and the roller compaction is ensured to be uniform.
5. The aqueduct concrete composite road mold construction method as claimed in claim 1, wherein in step S4, a suspected part is sampled by spot check, the dry volume weight and water content are measured, after being qualified, a supervision engineer is requested to check, unqualified persons are immediately turned loose and rolled again, and the soil is continuously paved and filled until being qualified.
6. The aqueduct concrete composite road formwork construction method as claimed in claim 1, wherein in the step S7, when the bottom row of steel bars and the upper layer of steel bars are bound, each point of the intersection of two lines close to the periphery is bound, the middle part is bound in a quincunx shape, and full binding is performed under bidirectional stress.
7. The aqueduct concrete composite road mold construction method as claimed in claim 1, wherein in step S8, the concrete of the aqueduct body is poured first, the concrete thickness of the aqueduct body is 40cm, and the pouring is completed in one time;
symmetrically pouring concrete on the side wall of the aqueduct according to a layer with the thickness of 35 cm;
unqualified concrete is strictly forbidden to be put into a warehouse, and unqualified materials which are put into the warehouse must be removed.
8. The aqueduct concrete composite road mold construction method as claimed in claim 7, wherein in step S8, the vibrator used when vibrating with a vibrator is an inserted type lengthened vibrator rod of 2.2kW, the vibrator cannot directly collide with the composite road mold, the steel reinforcement cage and the embedded part to prevent the composite road mold from being out of shape and the embedded part from being displaced;
the vibration time is based on that the concrete does not obviously sink any more, no bubble appears and the slurry begins to spread; the distance of the vibrator moving is not more than 1.5 times of the effective radius of the vibrator, the vibrator is inserted into the lower layer for 5-10cm, the vibrating is sequentially carried out in the same direction, the vibrator is inserted quickly and pulled slowly, the combination of the upper layer and the lower layer of the concrete is ensured, and the leakage vibration and the over-vibration are avoided.
9. The aqueduct concrete composite road-form construction method as claimed in claim 8, wherein in step S8, the concrete pouring is continuously performed for more than an allowable interval time, the construction joint treatment is performed, the joint division and the blocking are performed according to the design and construction condition restrictions, and the formed construction joint treatment method is mainly performed by the deburring of a deburring machine and is assisted by manual deburring.
10. The aqueduct concrete composite road-form construction method as claimed in claim 9, wherein in step S8, watering maintenance is started 10-12 hours after concrete pouring, watering is carried out in advance in hot and dry weather, or a method combining normal flow atomization and manual watering is adopted, during operation, the side surface is firstly sprinkled, the top surface is sprinkled after scouring, and maintenance of the exposed horizontal surface is covered by a wet jute bag (or felt);
the curing period is 7 days or days indicated by a supervision engineer, the important part is not less than 14 days, the curing water is clean and does not corrode the concrete, the watering curing is adopted, and the strength of the concrete of the aqueduct reaches the design requirement.
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