CN112144573A - Reverse-slotting PC (polycarbonate) member rapid inspection well construction method - Google Patents

Reverse-slotting PC (polycarbonate) member rapid inspection well construction method Download PDF

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Publication number
CN112144573A
CN112144573A CN202011056452.3A CN202011056452A CN112144573A CN 112144573 A CN112144573 A CN 112144573A CN 202011056452 A CN202011056452 A CN 202011056452A CN 112144573 A CN112144573 A CN 112144573A
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well
construction
paving
mixture
rolling
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CN112144573B (en
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欧阳骏弛
刘敏
郑元容
邱立
王文娟
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NO3 CONSTRUCTION Co Ltd OF CHONGQING CONSTRUCTION ENGINEERING GROUP
Chongqing Construction Engineering Group Co Ltd
No 3 Construction Co Ltd of Chongqing Construction Engineering Group
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NO3 CONSTRUCTION Co Ltd OF CHONGQING CONSTRUCTION ENGINEERING GROUP
Chongqing Construction Engineering Group Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
    • 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
    • E01C11/00—Details of pavings
    • E01C11/02—Arrangement or construction of joints; Methods of making joints; Packing for joints
    • E01C11/04—Arrangement or construction of joints; Methods of making joints; Packing for joints for cement concrete paving
    • E01C11/06—Methods of making joints
    • 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
    • E01C19/02—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 preparing the materials
    • 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
    • E01C19/12—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 distributing granular or liquid materials
    • E01C19/15—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 distributing granular or liquid materials for laying-down uncoated stone or similar materials, or for striking-off or spreading same without compacting, e.g. for crushed rock base courses, sand cushions for paving
    • 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
    • E01C19/12—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 distributing granular or liquid materials
    • E01C19/16—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 distributing granular or liquid materials for applying or spreading liquid materials, e.g. bitumen slurries
    • E01C19/17—Application by spraying or throwing
    • 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
    • E01C19/22—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 consolidating or finishing laid-down unset materials
    • E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
    • 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
    • E01C19/4866—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 with solely non-vibratory or non-percussive pressing or smoothing means for consolidating or finishing
    • E01C19/4873—Apparatus designed for railless operation
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00—Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Architecture (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Road Paving Structures (AREA)

Abstract

The invention belongs to the technical field of road well covers, and particularly relates to a reverse-slotting PC (polycarbonate) quick inspection well construction method which comprises the steps of inspection well foundation and bottom plate pouring, well body building, pointing and plastering, shaft periphery backfilling, rear steel plate covering well heads, road base structure construction, pavement base reverse-slotting well head digging, well head installation, well neck installation and block cutting, fine stone concrete connection compaction, secondary well head sealing of rear steel plates, road asphalt concrete bottom surface layer construction, secondary reverse-slotting well head digging and well curb construction. Pouring transition concrete materials for reinforcement and constructing a road asphalt concrete surface layer; the construction method has the advantages that the construction of the well body is optimized, transition materials are added, and the problem that the surface layer around the road well cover is easy to damage and sink is solved by ensuring the compactness of the surface around the well ring, improving the impact resistance of the well ring and the surface and releasing the deformation influence of different interfaces.

Description

Reverse-slotting PC (polycarbonate) member rapid inspection well construction method
Technical Field
The invention belongs to the technical field of road well covers, and particularly relates to a reverse-slotting PC (polycarbonate) member rapid inspection well construction method.
Background
With the continuous enhancement of comprehensive national power in China and the large environment that the domestic economic development is stepped into a new normal state, the road traffic construction concerning the national civilians is also in the period of rapid development. Along with the continuous increase of the density of a road network and the continuous improvement of the transportation flow, the construction speed and the quality level of road traffic become important engines for improving domestic consumption, reducing logistics cost, increasing the acquirement of the public and promoting the whole national economy level to be well and quickly developed.
In the years, the construction of domestic capital construction is suddenly advanced, the pace of high-density and high-strength road network construction indirectly covers many problems in road planning, construction and maintenance, and along with the continuous exposure of the problems in the use process of roads and the continuous emergence of common quality diseases, one of the most common and least radical problems is that the surface layer around the road well cover is easy to damage and sink.
In order to solve the problem, the construction method taking the reverse grooving process, the PC well neck, the PC concrete wedge block and the early strength concrete transition material as the core technology is finally formed by greatly improving the original road inspection well construction method through browsing the road construction data of a company, participating in the return visit and maintenance work of the road engineering and partially intervening in the construction technology work of constructing a road engineering project and continuously summarizing experience and refining the technical result according to the PDCA principle in the actual application process.
Disclosure of Invention
In order to make up for the defects of the prior art and solve the problems described in the background art, the invention provides a reverse-slotting PC member rapid inspection well construction method, which comprises the following steps:
s1: design drawing construction deepening, well neck wedge block BIM design
(1) Deepening an inspection well construction drawing, and carrying out construction deepening design on a well body, a well shaft, a well chamber surface layer and a pipe hoop joint large sample, so as to determine materials and a construction method;
(2) on the premise of acquiring an owner unit and a design unit, optimally designing the upper structure of the shaft, namely designing a well neck and a matched annular wedge block by using a BIM technology, and sending design data to a PC (personal computer) processing factory for production;
s2: construction of inspection well foundation and pouring of bottom plate
(1) The inspection well coordinate information marked in the foundation design drawing is used for releasing the open outer edge line of the inspection well by using a total station and a theodolite and reserving the width of the working surface;
(2) before the foundation trench is excavated, effective protection measures are taken for surrounding structures and underground pipeline facilities, the foundation trench is really well known to be harmonious, construction and precipitation are well done, and the safety of the surrounding structures and the underground pipeline facilities is fully ensured;
(3) when the bottom plate is constructed, the cushion layer is firstly poured on the prefabricated bottom plate and the cast-in-place bottom plate, and the thickness and the material of the prefabricated bottom plate and the cast-in-place bottom plate meet the design requirements;
(4) when the bottom plate is constructed, the requirements of design and standard specification are met by steel bar binding, concrete pouring and maintenance;
s3: building well body and backfilling periphery, and sealing well mouth with thick steel plate
(1) The inspection well is mostly built by wedges, stones and prefabricated well pipe connecting members of various specifications, before building, a block arrangement deepening design is made by adopting a BIM technology, attention is paid to arrangement of the wedges at the well pipe connecting members, and a block arrangement diagram is required to be arranged after deepening to guide construction;
(2) when the elevation difference between the elevation of the branch pipe and the branch pipe which are connected into the inspection well and the elevation difference between the elevation of the main pipe do not meet the height modulus of the standard wedge block, the thickness of masonry mortar is not adjusted and is larger than 20 mm; when the thickness of the masonry mortar is more than 20mm, adjusting by using a wedge block;
(3) the mortar used for building the inspection well is accurately metered and stirred according to the mixing ratio provided by a laboratory and approved by a supervision engineer, and the corresponding indexes meet the design and specification requirements;
(4) the wedge blocks are constructed in staggered joints, horizontal and vertical masonry mortar is full and dense, mortar joints are uniform, the thickness is between 8mm and 12mm, the mortar fullness is greater than 95%, through joints and blind joints cannot occur, water flushing grouting and crack pouring are strictly forbidden, and a scaffold is strictly forbidden to be arranged on the masonry;
(5) the landscape connecting members and the reserved branch pipes are installed according to the visual reservation requirement during masonry, and the pipe diameter, the direction, the elevation and the like meet the design requirement; the pipe orifice at the inner side of the reserved branch pipe is preferably constructed by low-strength cement mortar, and the distance between the pipe orifice and the inner wall of the well is more than 100 mm;
(6) the inner stair steps of the inspection well are required to be installed along with the building, the positions are accurate, and the inner stair steps of the inspection well cannot be stepped before the building mortar does not reach the specified compressive strength after the inner stair steps are installed;
(7) before backfilling is carried out on the periphery of the inspection well, pointing and seepage prevention of the inspection well are finished and meet quality requirements; the inspection well backfilling is carried out by adopting an artificial layered symmetrical backfilling method, the layered thickness of the inspection well backfilling is between 13 and 15cm, and the inspection well backfilling is tamped by a small tamping machine after being paved manually until the inspection well backfilling is flush with the surface of the well mouth of the inspection well;
(8) after the inspection well is backfilled, a thick steel plate with the same size as the outer frame of the well head wedge block or the same diameter of the outer frame is used for covering and sealing, and fine stone concrete is adopted around the steel plate to prevent the steel plate from loosening and deviating during operation of a construction machine;
(9) after the thick steel plate seals the well mouth, a mark is made nearby so as to determine reverse grooving of the position at a later stage;
s4: construction of road sub-base
(1) Measurement and paying-off and preparation:
a. after the roadbed is finished, the measuring pile is immediately recovered, and the deflection value is tested according to the design requirement;
b. recovering center line piles according to the distance of 10m, externally arranging indicating piles on both side lines, making an obvious loose pavement thickness mark on the indicating piles, considering the loose pavement thickness between 2 and 3 percent, adjusting the loose pavement thickness on site in actual construction, controlling the error of the loose pavement thickness elevation between-2 and +5mm, strictly forbidding collision marks during the whole operation period, cleaning a lower bearing layer after construction lofting, and sprinkling water for wetting before loading to ensure that the lower bearing layer is moist without water accumulation;
(2) transportation of mixed materials
a. When the mixed materials are charged, the dump truck moves to a position once when loading one bucket of materials, and one bucket of materials is charged for three times according to the front part, the middle part and the rear part of the carriage to prevent segregation;
b. transporting the mixture to a construction site by adopting a 15t dump truck, requiring a truck container to be clean, and controlling the traveling speed within 30 km/h;
c. the transport vehicle must be commanded by a specially-assigned person and runs according to a specified line, and the rapid braking and the rapid turning on the paved subbase and the base layer are strictly forbidden, and the speed of the transport vehicle is preferably slow so as to reduce the uneven rolling and the rutting;
(3) and cushion layer construction
a. Paving broken stones by adopting a paver, and manually matching and supplementing materials in places where local machines cannot be paved;
b. before paving, firstly, a measurer checks according to a rechecked level point and a control pile, and a paver is required to keep a proper speed to run at a constant speed in the paving process and is not required to be interrupted; the measuring personnel can detect and adjust the elevation, the cross slope and the flatness index at any time;
c. when rolling, the steel wheel road roller stabilizes the pressure once, and then uses static pressure for 2-3 times.
(4) Test section of subbase layer and base layer
a. Preparation work: before paving, the lower bearing layer is refitted and cleaned; when the lower bearing layer is paved, the defects of the lower bearing layer are firstly processed, the lower bearing layer is cleaned, the height, the width and the cross slope of the top surface of the processed lower bearing layer meet the standard requirements, the surface is smooth and solid, no loose or weak place exists, the side line is measured and placed after the surface is qualified, the central line is recovered, one pile control elevation is arranged at every 10m of the straight line section, and one pile control elevation is arranged at every 5m of the flat curve section;
b. paving a test section: before formal construction, construction of a test section is carried out, and preparation is made for scale construction; after the lower bearing layer is detected to be qualified and the approval of a supervision engineer is reported, a road section of 100m is selected for construction of a test section; through the construction of the test section, the reasonable personnel allocation, equipment combination, the structure layer mixing ratio, the loose paving coefficient, the compaction procedure, the compaction times and the compaction process which enable the mixture to reach the specified compaction degree when the water content is optimal are determined, and the proper length of each operation section and the proper thickness of one-time paving are determined;
(5) spreading the mixture
a. Spreading the mixture by using a spreading machine, and manually matching and supplementing materials in places where local mechanical spreading cannot be performed;
b. when the mixture is spread by using the spreading machine, the process is not interrupted, if the interruption time exceeds 2 hours due to reasons, a transverse seam is arranged, and the spreading machine is driven away from the tail end of the mixture;
c. checking and determining the top elevation of the template; in the paving process, the paver is required to keep a proper speed to run at a constant speed, and is not suitable to be interrupted; testing personnel need to detect the mixture ratio and the dosage of finished materials at any time and feed back the mixture ratio and the dosage to a mixing station in time; the measuring personnel can detect the elevation index, the horizontal index and the flatness index at any time and adjust the elevation index, the horizontal index and the flatness index in time.
d. A specially-assigned person is arranged behind the paver to eliminate segregation of coarse and fine aggregates, shovel off local coarse aggregate pits and fill the pits with a newly-mixed mixture;
(6) compacting of the mix
a. The rolling of the mixture is carried out according to the process confirmed in the test section and approved by a supervisory engineer; after paving and forming the mixture, when the water content is higher than 0.5-1% of the water content, immediately rolling in a full-width range, wherein the length of the rolled section is determined according to the air temperature condition;
b. when rolling, firstly stabilizing the pressure once by a steel wheel roller, then rolling for 3-5 times by a vibration roller, and finally compacting once by a rubber wheel roller;
c. the spread and shaped mixture is immediately compacted in the full-width range, rolling is finished on the same day, water is added when the water content of the mixture is lower than the design requirement, and airing is carried out when the water content of the mixture is higher than the design requirement so that the water content of the mixture reaches the construction requirement, and then rolling is carried out;
d. strictly forbidding the road roller to turn around and brake suddenly on a finished or rolling road section so as to keep the spreading layer surface from being damaged, wherein the wheel tracks are overlapped 1/2 wheel widths during rolling, so that the whole thickness and width of each layer are completely and uniformly compacted to the specified compaction degree;
e. in the compaction process, each working surface ensures that one rubber-tyred road roller carries out final pressing so as to solve the problem of fine cracks on the surface after the mixture is compacted;
f. leaving 5-8 m of a joint after one road section is finished without paving and rolling, and paving and rolling the non-construction part of the previous section and the next section during the construction of the next section; the mixture which is not compacted is removed and replaced by rain;
(7) and joint treatment
a. And (3) transverse seaming: when the transverse joint is arranged, the land leveler is driven away from the tail end of the mixture, the tail end of the mixture is manually tidily arranged, two square timbers with the same thickness as the mixture are placed against the mixture, the mixture of the square timbers is tidily arranged, the other side of each square timbers is backfilled with gravel and broken stones for 2.5-3m, the height of each square timbers is 2-5cm higher than that of each square timbers, and then the mixture is rolled and compacted;
b. longitudinal seaming: paving once for each single frame, not setting longitudinal joints, setting vertical longitudinal joints when the special-shaped section is unavoidable, wherein the joints need to be vertically connected, strictly prohibiting oblique stubbles, and adopting a processing method that when one frame is constructed in the previous section, a square timber or steel template is used for supporting one side close to the center, and the heights of the square timber and the steel template are the same as the thickness of the underlayer; after the mixture is mixed, manually shaping and rolling a part close to the support wood, and after the curing is finished, removing the support wood before another section is paved;
s5: health preserving and traffic control
(1) After each section of the mixture is rolled, compacted and formed, and the mixture is qualified through compaction degree inspection, watering and curing are immediately started without delay, the curing period is longer than 7 days, the strength of the mixture is subjected to test piece test, the number of the test pieces is larger than the standard requirement, the test pieces are subjected to moisture preservation and health maintenance for 6 days and soaked in water at the specified temperature, and after 1 day, the unconfined compression test is carried out;
(2) in the period of moisture preservation and health maintenance, except that the health maintenance vehicles and the supervision vehicles need to pass at a low speed, the passing and the construction of the previous structural layer of the large mechanical vehicle are strictly forbidden;
s6: digging out the well mouth by reverse grooving, installing well neck and wedge block
(1) According to the pre-reserved mark, the contour range of the wellhead is roughly positioned by using white lime, and the steel plate is excavated by manpower
(2) Removing the steel plate, closing the template along the top of the well wall wedge block, binding reinforcing steel bars, making an elevation control mark, and pouring the upper part of the well mouth to be used as a pressing top for leveling;
(3) the fine stone concrete is thinly paved on the surface of the coping, and then the well neck is adjusted and installed on the coping by a small hoisting tool for stable placement;
(4) after the well neck is installed, hoisting an annular PC wedge block for protecting the well neck, thereby avoiding the damage of road base, later road construction and driving load to the tapered well wall of the well neck;
s7: and (5) secondarily sealing the well neck by using a thick steel plate, and constructing the bottom surface layer of the road.
(1) After the thick steel plate closes the well neck, a mark is made nearby so as to determine reverse grooving of the position at a later stage;
(2) the periphery of the thick steel plate is fixed by fine stone concrete, so that the steel plate is prevented from loosening and deviating during operation of a construction machine;
(3) after the base layer construction is finished, the kerbstone and the kerb are installed, the total station is used for accurately positioning the line during the construction, and the line is hung manually for the setting mortar paving installation;
(4) sealing construction
a. Before slurry sealing is constructed, a pavement surface layer is cleaned, and road teeth, curbs and structures are properly protected to avoid pollution;
b. after the slurry seal layer is sprayed, the slurry seal layer cannot flow and penetrate into the base layer to a certain depth, and an oil film cannot be formed on the surface;
c. 2-3% of 32.5-grade ordinary Portland cement can be added to enhance the binding power between the asphalt and the aggregate and shorten the demulsification time of the modified emulsified asphalt;
d. when the slurry seal paver is used for paving, the slurry seal paver needs to move forward at a constant speed, the paving speed is 100-200 m/min, the surface needs to be smooth, and manual renovation needs to be carried out on local unevenness;
e. after the mixture is paved, continuously rolling for 4-8 times by using an 8-10T tire road roller, and in the rolling process, prohibiting the road roller from suddenly braking without turning around the newly paved mixture;
f. after slurry sealing is constructed, sealing measures are taken, and vehicles and pedestrians are strictly prohibited to pass through;
(5) through layer construction
a. Removing impurities of the base layer out of the roadbed by using a road sweeper;
b. using 9-12m3The/min air compressor blows clean floating dust on the surface of the base layer along the longitudinal direction to expose the aggregate;
c. the permeable layer construction adopts an asphalt spreading vehicle to spray, the height of the oil spraying nozzles is firstly adjusted, so that the same base layer point receives the oil mass of two oil nozzles simultaneously;
d. before large-area construction, a section of test path is made to determine the accuracy of the digital display technical parameters of the asphalt distribution truck, and when the accuracy is correct, the construction parameters are input according to the design;
e. when the asphalt spreading vehicle spreads asphalt, one lane is sprayed next to the other lane, the next lane and the previous lane are not overlapped or slightly overlapped in principle but cannot be exposed, and the exposed part needs to be sprayed by manual spraying equipment; after the spraying vehicle finishes spraying a lane and stops, the asphalt dropping from the oil drain pipe is immediately received by the oil groove to prevent excessive local asphalt, and if the local part still has redundant permeable asphalt and does not permeate into the base layer, the asphalt is timely removed;
f. in order to prevent the uneven oil spreading quantity at the beginning and the end, the base layer is covered by color strip cloth at the beginning and the end of spreading;
(6) construction of adhesive layer
a. Before the adhesive layer asphalt is sprayed, cleaning the asphalt by using a road sweeper once, and blowing off dust in the gap of the lower layer by using an air compressor of 9-12m 3/min;
b. the adhesive layer is sprayed by an asphalt spraying vehicle, and the nozzles and the oil spraying pipes are preheated before spraying, so that each nozzle and each oil spraying pipe are ensured to be free from blockage; adjusting the spray angle of the nozzles to ensure that the spray fans of the adjacent nozzles can be slightly overlapped at the lower angle;
c. spraying asphalt on lanes one by one, and controlling the overlapping of adjacent spraying belts by 10-15cm in order to ensure no leakage;
d. the spraying is uniform, the oil injection quantity is strictly controlled, the spraying quantity is small and not large, and oil pockets are not allowed to appear;
e. when the asphalt concrete is spread, if the asphalt concrete is adhered by an asphalt concrete truck and a sticky layer is broken in rainy days, manual filling and sprinkling are carried out in time;
f. after the spraying of the sticky layer emulsified asphalt is finished, a sealing measure is taken, and other vehicles and pedestrians except the asphalt mixture transportation vehicle are strictly forbidden to pass through;
s8: and digging out the upper opening of the well neck through the secondary reverse grooving, and installing a well ring and stabilizing the well ring by using a transition concrete material.
(1) According to the pre-reserved mark, the periphery of the outline size of the steel plate is expanded by 30cm outwards to serve as a boundary, the excavation range is roughly positioned by using white lime, and then manual reverse excavation is carried out to dig out the steel plate;
(2) the excavation depth of the reverse grooving penetrates through the bottom surface layer to reach the upper surface of the bottom base layer;
(3) firmly installing the well cover on the well neck according to the requirements of product specifications and design specifications;
(4) determining the strength grade of the early strength concrete poured back to the bottom layer excavation part by the calculation of a designed unit, and leveling the early strength concrete poured back to the bottom layer excavation part;
(5) the concrete is well maintained, and the next procedure cannot be carried out before the strength does not meet the design requirement;
s9: road surface layer construction
(1) And paving test section
Before formal paving, selecting a representative road section with the length of more than 200m to carry out test section construction; through tests, the proper loose paving coefficient, paving and rolling temperature, rolling times and mixing proportion of the mixture are determined, and meanwhile, whether construction organization, construction process, mechanical equipment and combination are reasonable or not is checked, so that adjustment is carried out according to the reasonable combination, and preparation is provided for spreading and paving comprehensively;
(2) transporting asphalt concrete
a. The asphalt mixture is transported by a 15t dump truck, and the material transporting truck is covered by tarpaulin for heat preservation, rain prevention and pollution prevention; when the asphalt is on site, the temperature of the hot asphalt concrete is required to meet corresponding requirements, the high temperature is less than 165 ℃, the paving of the asphalt concrete is carried out in sunny weather, and the asphalt concrete cannot be paved in rainy days;
b. in order to prevent the asphalt mixture from being bonded, a layer of oil-water mixed liquid is coated in the carriage, but residual liquid cannot be accumulated at the bottom of the carriage; the number of the transport vehicles is determined according to the paving speed on site, and the paving is ensured to be continuously carried out;
c. the mixture transported to the site should be subjected to temperature measurement and appearance inspection by a special person; if the temperature is unqualified, or the flower is white, the cluster is formed, the color is withered, brown and dark, and the product is exposed to rain, the product is discarded and cannot be used;
d. in the continuous paving process, the material conveying vehicle should stop 10-15cm in front of the paver and cannot impact the paver; hanging a neutral gear and pushing the front part to advance by a spreading machine;
(3) concrete paving
a. The temperature of the mixture is strictly controlled during construction, the mixture cannot be paved when the ground temperature is lower than 15 ℃, effective measures are taken when the mixture needs to be paved, and construction can be carried out after the supervision engineer agrees;
b. the paving speed is coordinated with the supply quantity of the mixture, is controlled to be 2-4 m/min, and is balanced and continuous, so that the time is not fast, the time is not slow, and the midway is not stopped; the paving speed of the paver is actually controlled by the mixing yield and the transport capacity, and meanwhile, the paver must be matched with the rear bin, so that the walking speed is not more than 3 m/min, the phenomenon that the paver stops waiting for materials on a certain section and the temperature of a mixture below the paver is reduced, the compaction of the mixture is influenced, and the local leveling speed is not good is prevented;
c. the paving thickness is the designed thickness multiplied by the loose paving coefficient, the thickness, the cross slope and the road arch of the paving layer are checked at any time in the paving process, the average thickness is checked according to the ratio of the total amount of the paving mixture to the area, and the average thickness is adjusted at any time when the average thickness is not in accordance with the requirement;
d. the paver is located at a machine point 1 hour before paving, the front end of the paver stretches out of the cross rod sling chain to be aligned to a walking base line of the paver, and the base line is well drawn before paving. The rear end of the paver pads the ironing plate to the elevation of the virtual paving surface by using a cushion block; after the preparation, starting a gas heating system of the paver to fully preheat the screed plate; the paver controls the elevation of two ends of the screed plate by adopting a bilateral sensor mode, and after the initial position of the sensor is adjusted, the screed plate walks on an aluminum alloy ruler with a preset distance of 5 meters;
e. paving temperature is determined according to trial paving, and construction temperature is controlled to be 135-145 ℃;
f. the quality of the paving material should be tracked and detected during paving, and the defects should be repaired when the paving material is hot when found; removing the re-paved layer when the repair is not good;
(4) rolling the asphalt concrete surface layer
a. Initial pressing: firstly, a middle and light static steel wheel road roller with 8-10 t is adopted and is carried out after being closely attached to a paver; the rolling speed is coordinated with the paving speed, the rolling speed is controlled to be 1.5-2 km/h, the rolling times are controlled to be 1-2 times, and a vibratory roller is adopted to stop vibrating or carry out rolling under the micro-vibration state;
b. repressing: adopting a vibratory roller with the weight of more than 18t, and carrying out primary rolling at the rolling temperature of more than 120 ℃; the rolling speed is controlled to be 2.5-4 km/h, the rolling times are 2-3 times, and the rolling speed is determined by field tests;
c. final pressure: and rolling by using an 18t static steel wheel road roller, wherein the rolling temperature is controlled to be more than 105 ℃, and the rolling times are 1-2 times until wheel tracks left in the re-pressing process are eliminated.
Preferably, the BIM technique in S1 is used for designing a well neck and a matched annular wedge, and the BIM design point of the well neck and the matched annular wedge is as follows:
(1) the lower opening of the well neck is required to determine the corresponding thickness according to the designed wall thickness of the shaft;
(2) the design of the upper opening of the well neck is to make the tongue-and-groove design of the corresponding part by considering the size and tolerance standard of the well lid of the national walling crib, and properly enlarge the tolerance size so as to facilitate the later installation of the walling crib;
(3) the annular wedge blocks are not made into pure concrete structures, and reinforcing steel bars are also arranged to enhance the integral pressure resistance.
Preferably, after the test section in the S4 paving test section is finished, various indexes such as flatness, road arch transverse slope, compactness, strength and the like of the test section are detected, and if the requirements are met, the test section is summarized, supervised and approved; otherwise, the construction of the test section is abandoned by self until the test section is qualified.
Preferably, in the final pressing stage in S9, an anti-sticking agent is applied to the rolling wheel during rolling to prevent the asphalt mixture from adhering to the rolling wheel, the road roller tries to be stable when starting, and the rolling speeds are balanced and consistent; in the rolling process, turning and turning are reduced, turning can be used for braking, and the turning and turning can be carried out slowly and stably when the turning and the braking are required.
Preferably, a plurality of steel bars are uniformly arranged on the curved surface of the well neck, one end of each steel bar is fixedly connected to the middle of the curved surface, and the length of each steel bar is greater than the height of the well neck; a plurality of through holes are uniformly formed in the end face of the annular wedge block; each through hole is in one-to-one correspondence with the steel bar at the position of the annular wedge block, the other end of the steel bar penetrates through the through hole, the through hole is bent by an angle of 90 degrees and is bent towards the periphery of the annular wedge block, and the bending point is located on the upper end face of the annular wedge block.
Preferably, water-absorbing expansion rubber is arranged at the fixedly connected position of the steel bar and the well neck; the water-absorbing expansion rubber is adhered to the surfaces of the steel bars and the well neck, a chamfer is arranged at the upper end of the water-absorbing expansion rubber, and a layer of plastic film for isolating water is wrapped on the surface of the water-absorbing expansion rubber.
Preferably, the outer ring of the cylindrical part of the well neck is provided with a hoop; the inner ring of the embracing ring is sleeved on the outer ring of the cylindrical part on the well neck, the lower end surface of the embracing ring is attached to the upper end surface of the annular wedge block, and a plurality of pull rings are uniformly arranged on the outer ring of the embracing ring; the number of the pull rings is the same as that of the steel bars, and ropes are arranged on the inner rings of the pull rings.
Preferably, a fastening bolt is arranged between the adjacent pull rings; and one end of the fastening bolt penetrates through the embracing ring and abuts against the outer ring of the cylindrical part of the well neck.
The invention has the technical effects and advantages that:
1. compared with the traditional method of reserving stubble connection around a well ring after a well is made, the construction method creatively adopts the reverse grooving technology, the covering is made firstly after the construction of the shaft is completed, and the road base layer covered by the shaft is dug out through reverse grooving after the road base layer is finished, so that the unbalanced working condition load of construction machinery around the well and the resulting incompact compactness can be effectively avoided, and further the road surface is damaged and cracked under the long-term driving load action.
2. Compare the traditional method of directly ligature reinforcing bar pouring concrete on the pit shaft and form walling crib, utilize BIM to combine the drawing to develop the deepening design of well neck and supporting annular voussoir, entrust supplier's manufacturing PC finished product component again, can directly install after transporting to the scene, so not only save the time limit for a project, reduce concrete placement maintenance process, more importantly compare cast-in-place walling crib, the finished product component possesses more good mechanical properties and durability, can effectively promote walling crib to the bearing capacity of vehicle lateral thrust, avoid the road to be disturbed and destroyed.
3. In the prior road construction, the connection part of the well ring and the pavement surface layer is not always made of any transition material and is directly and rigidly connected, the pavement and the well ring cannot be mutually extruded due to deformation release under the concentrated load action of large-tonnage heavy machinery, and on the basis of summarizing return visit maintenance data, the ultra-early strength concrete transition material with the width of 30-50 cm and the thickness larger than the thickness of the pavement surface layer is creatively poured on the upper part of the well neck and the well ring, so that the problem of transition between the well ring and the pavement is effectively solved, and the mechanical disturbance damage during construction is avoided.
Drawings
The invention is further described with reference to the following figures and embodiments.
FIG. 1 is a flow chart of the construction process of the present invention;
FIG. 2 is a view of the neck of the well in combination with the annular wedge of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is a cross-sectional view of the well neck and annular wedge of the present invention;
FIG. 5 is an exploded view of the well neck and annular wedge of the present invention;
in the figure: the well neck 1, steel bars 11, water-swelling rubber 111, annular wedges 2, through holes 21, hoops 3, pull rings 31, ropes 32 and fastening bolts 33.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the following embodiments.
As shown in fig. 1 to 5, the construction method of the reverse slotted PC member fast inspection well of the present invention comprises the following steps:
s1: design drawing construction deepening, well neck 1 wedge block BIM design
(1) Deepening an inspection well construction drawing, and carrying out construction deepening design on a well body, a well shaft, a well chamber surface layer and a pipe hoop joint large sample, so as to determine materials and a construction method;
(2) on the premise of acquiring an owner unit and a design unit, optimally designing the upper structure of the shaft, namely designing a well neck 1 and a matched annular wedge block 2 by using a BIM (building information modeling) technology, and sending design data to a PC (personal computer) processing plant for production;
s2: construction of inspection well foundation and pouring of bottom plate
(1) The inspection well coordinate information marked in the foundation design drawing is used for releasing the open outer edge line of the inspection well by using a total station and a theodolite and reserving the width of the working surface;
(2) before the foundation trench is excavated, effective protection measures are taken for surrounding structures and underground pipeline facilities, the foundation trench is really well known to be harmonious, construction and precipitation are well done, and the safety of the surrounding structures and the underground pipeline facilities is fully ensured;
(3) when the bottom plate is constructed, the cushion layer is firstly poured on the prefabricated bottom plate and the cast-in-place bottom plate, and the thickness and the material of the prefabricated bottom plate and the cast-in-place bottom plate meet the design requirements;
(4) when the bottom plate is constructed, the requirements of design and standard specification are met by steel bar binding, concrete pouring and maintenance;
s3: building well body and backfilling periphery, and sealing well mouth with thick steel plate
(1) The inspection well is mostly built by wedges, stones and prefabricated well pipe connecting members of various specifications, before building, a block arrangement deepening design is made by adopting a BIM technology, attention is paid to arrangement of the wedges at the well pipe connecting members, and a block arrangement diagram is required to be arranged after deepening to guide construction;
(2) when the elevation difference between the elevation of the branch pipe and the branch pipe which are connected into the inspection well and the elevation difference between the elevation of the main pipe do not meet the height modulus of the standard wedge block, the thickness of masonry mortar is not adjusted and is larger than 20 mm; when the thickness of the masonry mortar is more than 20mm, adjusting by using a wedge block;
(3) the mortar used for building the inspection well is accurately metered and stirred according to the mixing ratio provided by a laboratory and approved by a supervision engineer, and the corresponding indexes meet the design and specification requirements;
(4) the wedge blocks are constructed in staggered joints, horizontal and vertical masonry mortar is full and dense, mortar joints are uniform, the thickness is between 8mm and 12mm, the mortar fullness is greater than 95%, through joints and blind joints cannot occur, water flushing grouting and crack pouring are strictly forbidden, and a scaffold is strictly forbidden to be arranged on the masonry;
(5) the landscape connecting members and the reserved branch pipes are installed according to the visual reservation requirement during masonry, and the pipe diameter, the direction, the elevation and the like meet the design requirement; the pipe orifice at the inner side of the reserved branch pipe is preferably constructed by low-strength cement mortar, and the distance between the pipe orifice and the inner wall of the well is more than 100 mm;
(6) the inner stair steps of the inspection well are required to be installed along with the building, the positions are accurate, and the inner stair steps of the inspection well cannot be stepped before the building mortar does not reach the specified compressive strength after the inner stair steps are installed;
(7) before backfilling is carried out on the periphery of the inspection well, pointing and seepage prevention of the inspection well are finished and meet quality requirements; the inspection well backfilling is carried out by adopting an artificial layered symmetrical backfilling method, the layered thickness of the inspection well backfilling is between 13 and 15cm, and the inspection well backfilling is tamped by a small tamping machine after being paved manually until the inspection well backfilling is flush with the surface of the well mouth of the inspection well;
(8) after the inspection well is backfilled, a thick steel plate with the same size as the outer frame of the well head wedge block or the same diameter of the outer frame is used for covering and sealing, and fine stone concrete is adopted around the steel plate to prevent the steel plate from loosening and deviating during operation of a construction machine;
(9) after the thick steel plate seals the well mouth, a mark is made nearby so as to determine reverse grooving of the position at a later stage;
s4: construction of road sub-base
(1) Measurement and paying-off and preparation:
a. after the roadbed is finished, the measuring pile is immediately recovered, and the deflection value is tested according to the design requirement;
b. recovering center line piles according to the distance of 10m, externally arranging indicating piles on both side lines, making an obvious loose pavement thickness mark on the indicating piles, considering the loose pavement thickness between 2 and 3 percent, adjusting the loose pavement thickness on site in actual construction, controlling the error of the loose pavement thickness elevation between-2 and +5mm, strictly forbidding collision marks during the whole operation period, cleaning a lower bearing layer after construction lofting, and sprinkling water for wetting before loading to ensure that the lower bearing layer is moist without water accumulation;
(2) transportation of mixed materials
a. When the mixed materials are charged, the dump truck moves to a position once when loading one bucket of materials, and one bucket of materials is charged for three times according to the front part, the middle part and the rear part of the carriage to prevent segregation;
b. transporting the mixture to a construction site by adopting a 15t dump truck, requiring a truck container to be clean, and controlling the traveling speed within 30 km/h;
c. the transport vehicle must be commanded by a specially-assigned person and runs according to a specified line, and the rapid braking and the rapid turning on the paved subbase and the base layer are strictly forbidden, and the speed of the transport vehicle is preferably slow so as to reduce the uneven rolling and the rutting;
(3) and cushion layer construction
a. Paving broken stones by adopting a paver, and manually matching and supplementing materials in places where local machines cannot be paved;
b. before paving, firstly, a measurer checks according to a rechecked level point and a control pile, and a paver is required to keep a proper speed to run at a constant speed in the paving process and is not required to be interrupted; the measuring personnel can detect and adjust the elevation, the cross slope and the flatness index at any time;
c. when rolling, the steel wheel road roller stabilizes the pressure once, and then uses static pressure for 2-3 times.
(4) Test section of subbase layer and base layer
a. Preparation work: before paving, the lower bearing layer is refitted and cleaned; when the lower bearing layer is paved, the defects of the lower bearing layer are firstly processed, the lower bearing layer is cleaned, the height, the width and the cross slope of the top surface of the processed lower bearing layer meet the standard requirements, the surface is smooth and solid, no loose or weak place exists, the side line is measured and placed after the surface is qualified, the central line is recovered, one pile control elevation is arranged at every 10m of the straight line section, and one pile control elevation is arranged at every 5m of the flat curve section;
b. paving a test section: before formal construction, construction of a test section is carried out, and preparation is made for scale construction; after the lower bearing layer is detected to be qualified and the approval of a supervision engineer is reported, a road section of 100m is selected for construction of a test section; through the construction of the test section, the reasonable personnel allocation, equipment combination, the structure layer mixing ratio, the loose paving coefficient, the compaction procedure, the compaction times and the compaction process which enable the mixture to reach the specified compaction degree when the water content is optimal are determined, and the proper length of each operation section and the proper thickness of one-time paving are determined;
(5) spreading the mixture
a. Spreading the mixture by using a spreading machine, and manually matching and supplementing materials in places where local mechanical spreading cannot be performed;
b. when the mixture is spread by using the spreading machine, the process is not interrupted, if the interruption time exceeds 2 hours due to reasons, a transverse seam is arranged, and the spreading machine is driven away from the tail end of the mixture;
c. checking and determining the top elevation of the template; in the paving process, the paver is required to keep a proper speed to run at a constant speed, and is not suitable to be interrupted; testing personnel need to detect the mixture ratio and the dosage of finished materials at any time and feed back the mixture ratio and the dosage to a mixing station in time; the measuring personnel can detect the elevation index, the horizontal index and the flatness index at any time and adjust the elevation index, the horizontal index and the flatness index in time.
d. A specially-assigned person is arranged behind the paver to eliminate segregation of coarse and fine aggregates, shovel off local coarse aggregate pits and fill the pits with a newly-mixed mixture;
(6) compacting of the mix
a. The rolling of the mixture is carried out according to the process confirmed in the test section and approved by a supervisory engineer; after paving and forming the mixture, when the water content is higher than 0.5-1% of the water content, immediately rolling in a full-width range, wherein the length of the rolled section is determined according to the air temperature condition;
b. when rolling, firstly stabilizing the pressure once by a steel wheel roller, then rolling for 3-5 times by a vibration roller, and finally compacting once by a rubber wheel roller;
c. the spread and shaped mixture is immediately compacted in the full-width range, rolling is finished on the same day, water is added when the water content of the mixture is lower than the design requirement, and airing is carried out when the water content of the mixture is higher than the design requirement so that the water content of the mixture reaches the construction requirement, and then rolling is carried out;
d. strictly forbidding the road roller to turn around and brake suddenly on a finished or rolling road section so as to keep the spreading layer surface from being damaged, wherein the wheel tracks are overlapped 1/2 wheel widths during rolling, so that the whole thickness and width of each layer are completely and uniformly compacted to the specified compaction degree;
e. in the compaction process, each working surface ensures that one rubber-tyred road roller carries out final pressing so as to solve the problem of fine cracks on the surface after the mixture is compacted;
f. leaving 5-8 m of a joint after one road section is finished without paving and rolling, and paving and rolling the non-construction part of the previous section and the next section during the construction of the next section; the mixture which is not compacted is removed and replaced by rain;
(7) and joint treatment
a. And (3) transverse seaming: when the transverse joint is arranged, the land leveler is driven away from the tail end of the mixture, the tail end of the mixture is manually tidily arranged, two square timbers with the same thickness as the mixture are placed against the mixture, the mixture of the square timbers is tidily arranged, the other side of each square timbers is backfilled with gravel and broken stones for 2.5-3m, the height of each square timbers is 2-5cm higher than that of each square timbers, and then the mixture is rolled and compacted;
b. longitudinal seaming: paving once for each single frame, not setting longitudinal joints, setting vertical longitudinal joints when the special-shaped section is unavoidable, wherein the joints need to be vertically connected, strictly prohibiting oblique stubbles, and adopting a processing method that when one frame is constructed in the previous section, a square timber or steel template is used for supporting one side close to the center, and the heights of the square timber and the steel template are the same as the thickness of the underlayer; after the mixture is mixed, manually shaping and rolling a part close to the support wood, and after the curing is finished, removing the support wood before another section is paved;
s5: health preserving and traffic control
(1) After each section of the mixture is rolled, compacted and formed, and the mixture is qualified through compaction degree inspection, watering and curing are immediately started without delay, the curing period is longer than 7 days, the strength of the mixture is subjected to test piece test, the number of the test pieces is larger than the standard requirement, the test pieces are subjected to moisture preservation and health maintenance for 6 days and soaked in water at the specified temperature, and after 1 day, the unconfined compression test is carried out;
(2) in the period of moisture preservation and health maintenance, except that the health maintenance vehicles and the supervision vehicles need to pass at a low speed, the passing and the construction of the previous structural layer of the large mechanical vehicle are strictly forbidden;
s6: digging out the well mouth by reverse grooving, installing the well neck 1 and the wedge block
(1) According to the pre-reserved mark, the contour range of the wellhead is roughly positioned by using white lime, and the steel plate is excavated by manpower
(2) Removing the steel plate, closing the template along the top of the well wall wedge block, binding reinforcing steel bars, making an elevation control mark, and pouring the upper part of the well mouth to be used as a pressing top for leveling;
(3) thin stone concrete is paved on the surface of the coping, and then a small hoisting tool is used for adjusting and installing the well neck 1 to the coping for stable placement;
(4) after the well neck 1 is installed, hoisting an annular PC wedge block which plays a role of protecting the well neck 1, thereby avoiding the damage of road base, later road construction and driving load to the tapered well wall of the well neck 1;
s7: and (5) secondarily sealing the well neck 1 by using a thick steel plate, and constructing a bottom surface layer of the road.
(1) After the thick steel plate seals the well neck 1, a mark is made nearby so as to determine reverse grooving of the position at a later stage;
(2) the periphery of the thick steel plate is fixed by fine stone concrete, so that the steel plate is prevented from loosening and deviating during operation of a construction machine;
(3) after the base layer construction is finished, the kerbstone and the kerb are installed, the total station is used for accurately positioning the line during the construction, and the line is hung manually for the setting mortar paving installation;
(4) sealing construction
a. Before slurry sealing is constructed, a pavement surface layer is cleaned, and road teeth, curbs and structures are properly protected to avoid pollution;
b. after the slurry seal layer is sprayed, the slurry seal layer cannot flow and penetrate into the base layer to a certain depth, and an oil film cannot be formed on the surface;
c. 2-3% of 32.5-grade ordinary Portland cement can be added to enhance the binding power between the asphalt and the aggregate and shorten the demulsification time of the modified emulsified asphalt;
d. when the slurry seal paver is used for paving, the slurry seal paver needs to move forward at a constant speed, the paving speed is 100-200 m/min, the surface needs to be smooth, and manual renovation needs to be carried out on local unevenness;
e. after the mixture is paved, continuously rolling for 4-8 times by using an 8-10T tire road roller, and in the rolling process, prohibiting the road roller from suddenly braking without turning around the newly paved mixture;
f. after slurry sealing is constructed, sealing measures are taken, and vehicles and pedestrians are strictly prohibited to pass through;
(5) through layer construction
a. Removing impurities of the base layer out of the roadbed by using a road sweeper;
b. using 9-12m3The/min air compressor blows clean floating dust on the surface of the base layer along the longitudinal direction to expose the aggregate;
c. the permeable layer construction adopts an asphalt spreading vehicle to spray, the height of the oil spraying nozzles is firstly adjusted, so that the same base layer point receives the oil mass of two oil nozzles simultaneously;
d. before large-area construction, a section of test path is made to determine the accuracy of the digital display technical parameters of the asphalt distribution truck, and when the accuracy is correct, the construction parameters are input according to the design;
e. when the asphalt spreading vehicle spreads asphalt, one lane is sprayed next to the other lane, the next lane and the previous lane are not overlapped or slightly overlapped in principle but cannot be exposed, and the exposed part needs to be sprayed by manual spraying equipment; after the spraying vehicle finishes spraying a lane and stops, the asphalt dropping from the oil drain pipe is immediately received by the oil groove to prevent excessive local asphalt, and if the local part still has redundant permeable asphalt and does not permeate into the base layer, the asphalt is timely removed;
f. in order to prevent the uneven oil spreading quantity at the beginning and the end, the base layer is covered by color strip cloth at the beginning and the end of spreading;
(6) construction of adhesive layer
a. Before the adhesive layer asphalt is sprayed, cleaning the asphalt by using a road sweeper once, and blowing off dust in the gap of the lower layer by using an air compressor of 9-12m 3/min;
b. the adhesive layer is sprayed by an asphalt spraying vehicle, and the nozzles and the oil spraying pipes are preheated before spraying, so that each nozzle and each oil spraying pipe are ensured to be free from blockage; adjusting the spray angle of the nozzles to ensure that the spray fans of the adjacent nozzles can be slightly overlapped at the lower angle;
c. spraying asphalt on lanes one by one, and controlling the overlapping of adjacent spraying belts by 10-15cm in order to ensure no leakage;
d. the spraying is uniform, the oil injection quantity is strictly controlled, the spraying quantity is small and not large, and oil pockets are not allowed to appear;
e. when the asphalt concrete is spread, if the asphalt concrete is adhered by an asphalt concrete truck and a sticky layer is broken in rainy days, manual filling and sprinkling are carried out in time;
f. after the spraying of the sticky layer emulsified asphalt is finished, a sealing measure is taken, and other vehicles and pedestrians except the asphalt mixture transportation vehicle are strictly forbidden to pass through;
s8: and digging out the upper opening of the well neck 1 through the secondary reverse grooving, and installing a well ring and stabilizing the well ring by using a transition concrete material.
(1) According to the pre-reserved mark, the periphery of the outline size of the steel plate is expanded by 30cm outwards to serve as a boundary, the excavation range is roughly positioned by using white lime, and then manual reverse excavation is carried out to dig out the steel plate;
(2) the excavation depth of the reverse grooving penetrates through the bottom surface layer to reach the upper surface of the bottom base layer;
(3) firmly installing the well cover on the well neck 1 according to the requirements of product specifications and design specifications;
(4) determining the strength grade of the early strength concrete poured back to the bottom layer excavation part by the calculation of a designed unit, and leveling the early strength concrete poured back to the bottom layer excavation part;
(5) the concrete is well maintained, and the next procedure cannot be carried out before the strength does not meet the design requirement;
s9: road surface layer construction
(1) And paving test section
Before formal paving, selecting a representative road section with the length of more than 200m to carry out test section construction; through tests, the proper loose paving coefficient, paving and rolling temperature, rolling times and mixing proportion of the mixture are determined, and meanwhile, whether construction organization, construction process, mechanical equipment and combination are reasonable or not is checked, so that adjustment is carried out according to the reasonable combination, and preparation is provided for spreading and paving comprehensively;
(2) transporting asphalt concrete
a. The asphalt mixture is transported by a 15t dump truck, and the material transporting truck is covered by tarpaulin for heat preservation, rain prevention and pollution prevention; when the asphalt is on site, the temperature of the hot asphalt concrete is required to meet corresponding requirements, the high temperature is less than 165 ℃, the paving of the asphalt concrete is carried out in sunny weather, and the asphalt concrete cannot be paved in rainy days;
b. in order to prevent the asphalt mixture from being bonded, a layer of oil-water mixed liquid is coated in the carriage, but residual liquid cannot be accumulated at the bottom of the carriage; the number of the transport vehicles is determined according to the paving speed on site, and the paving is ensured to be continuously carried out;
c. the mixture transported to the site should be subjected to temperature measurement and appearance inspection by a special person; if the temperature is unqualified, or the flower is white, the cluster is formed, the color is withered, brown and dark, and the product is exposed to rain, the product is discarded and cannot be used;
d. in the continuous paving process, the material conveying vehicle should stop 10-15cm in front of the paver and cannot impact the paver; hanging a neutral gear and pushing the front part to advance by a spreading machine;
(3) concrete paving
a. The temperature of the mixture is strictly controlled during construction, the mixture cannot be paved when the ground temperature is lower than 15 ℃, effective measures are taken when the mixture needs to be paved, and construction can be carried out after the supervision engineer agrees;
b. the paving speed is coordinated with the supply quantity of the mixture, is controlled to be 2-4 m/min, and is balanced and continuous, so that the time is not fast, the time is not slow, and the midway is not stopped; the paving speed of the paver is actually controlled by the mixing yield and the transport capacity, and meanwhile, the paver must be matched with the rear bin, so that the walking speed is not more than 3 m/min, the phenomenon that the paver stops waiting for materials on a certain section and the temperature of a mixture below the paver is reduced, the compaction of the mixture is influenced, and the local leveling speed is not good is prevented;
c. the paving thickness is the designed thickness multiplied by the loose paving coefficient, the thickness, the cross slope and the road arch of the paving layer are checked at any time in the paving process, the average thickness is checked according to the ratio of the total amount of the paving mixture to the area, and the average thickness is adjusted at any time when the average thickness is not in accordance with the requirement;
d. the paver is located at a machine point 1 hour before paving, the front end of the paver stretches out of the cross rod sling chain to be aligned to a walking base line of the paver, and the base line is well drawn before paving. The rear end of the paver pads the ironing plate to the elevation of the virtual paving surface by using a cushion block; after the preparation, starting a gas heating system of the paver to fully preheat the screed plate; the paver controls the elevation of two ends of the screed plate by adopting a bilateral sensor mode, and after the initial position of the sensor is adjusted, the screed plate walks on an aluminum alloy ruler with a preset distance of 5 meters;
e. paving temperature is determined according to trial paving, and construction temperature is controlled to be 135-145 ℃;
f. the quality of the paving material should be tracked and detected during paving, and the defects should be repaired when the paving material is hot when found; removing the re-paved layer when the repair is not good;
(4) rolling the asphalt concrete surface layer
a. Initial pressing: firstly, a middle and light static steel wheel road roller with 8-10 t is adopted and is carried out after being closely attached to a paver; the rolling speed is coordinated with the paving speed, the rolling speed is controlled to be 1.5-2 km/h, the rolling times are controlled to be 1-2 times, and a vibratory roller is adopted to stop vibrating or carry out rolling under the micro-vibration state;
b. repressing: adopting a vibratory roller with the weight of more than 18t, and carrying out primary rolling at the rolling temperature of more than 120 ℃; the rolling speed is controlled to be 2.5-4 km/h, the rolling times are 2-3 times, and the rolling speed is determined by field tests;
c. final pressure: and rolling by using an 18t static steel wheel road roller, wherein the rolling temperature is controlled to be more than 105 ℃, and the rolling times are 1-2 times until wheel tracks left in the re-pressing process are eliminated.
BIM technique carries out well neck 1 and supporting annular voussoir 2 design among S1, and this well neck 1 and supporting annular voussoir 2BIM design point:
(1) the lower opening of the well neck 1 is required to determine the corresponding thickness according to the designed wall thickness of the shaft;
(2) the upper opening of the well neck 1 is designed by taking the size and tolerance standard of the well lid of the national well ring into consideration and making the tongue-and-groove design of the corresponding part, and the tolerance size is properly enlarged so as to facilitate the later installation of the well ring;
(3) the annular wedge block 2 is not made into a pure concrete structure, and a reinforcing steel bar is also arranged to enhance the integral pressure resistance.
Detecting various indexes such as flatness, road arch transverse slope, compactness, strength and the like after the test section in the S4 paving test section is finished, and reporting the test section for supervision and approval if the test section meets the requirement; otherwise, the construction of the test section is abandoned by self until the test section is qualified.
In the final pressing stage of S9, an anti-sticking agent is constructed on the rolling wheel in the rolling process to prevent the asphalt mixture from adhering to the rolling wheel, the road roller tries to be stable when starting, and the rolling speed is balanced and consistent; in the rolling process, turning and turning are reduced, turning can be used for braking, and the turning and turning can be carried out slowly and stably when the turning and the braking are required.
As a specific embodiment of the present invention, a plurality of steel bars 11 are uniformly arranged on the curved surface of the well neck 1, one end of each steel bar 11 is fixedly connected to the middle position of the curved surface, and the length of each steel bar 11 is greater than the height of the well neck 1; a plurality of through holes 21 are uniformly formed in the end face of the annular wedge block 2; each through hole 21 is in one-to-one correspondence with the steel bar 11 at the position of the annular wedge block 2, the other end of the steel bar 11 penetrates through the through hole 21, the through hole is bent by an angle of 90 degrees and is bent towards the periphery of the annular wedge block 2, and the bending point is positioned on the upper end face of the annular wedge block 2; in the process that the inner ring of the annular wedge block 2 is sleeved on the well neck 1, the annular wedge block 2 is suspended above the well neck 1 through a crane, then each steel bar 11 on the well neck 1 is aligned with each through hole 21 on the annular wedge block 2, then the annular wedge block 2 is gradually and slowly descended until the annular wedge block 2 is attached to the well neck 1, and then each steel bar 11 is bent by 90 degrees along the upper surface of the annular wedge block 2, so that the steel bars 11 are attached to the upper surface of the annular wedge block 2; annular voussoir 2 is tied on well neck 1 by billet 11 this moment, has increased the fastness between well neck 1 and the annular voussoir 2, and when needs were to well neck 1 adjustment position, through hoisting annular voussoir 2, well neck 1 also rises along with annular voussoir 2, makes things convenient for the adjustment of well neck 1 position.
As a specific embodiment of the invention, the water-absorbing expansion rubber 111 is arranged at the fixed connection position of the steel bar 11 and the well neck 1; the water-absorbing expansion rubber 111 is adhered to the surfaces of the steel bar 11 and the well neck 1, a chamfer is arranged at the upper end of the water-absorbing expansion rubber 111, and a layer of plastic film for isolating water is wrapped on the surface of the water-absorbing expansion rubber 111; before covering the annular wedge block 2 on the well neck 1, firstly taking down the plastic film on the surface of the water-absorbing expansion rubber 111, then buckling the annular wedge block 2 on the well neck 1, after the annular wedge block 2 is jointed with the well neck 1, embedding the water-absorbing expansion rubber 111 at the lower hole end of the through hole 21, plugging the gap between the steel bar 11 and the through hole 21, and avoiding that external water permeates into the jointing layer between the well neck 1 and the annular wedge block 2 from the through hole 21 to influence the jointing tightness between the well neck 1 and the annular wedge block 2.
As a specific embodiment of the invention, the outer ring of the cylindrical part of the well neck 1 is provided with a hoop 3; the inner ring of the embracing ring 3 is sleeved on the outer ring of the cylindrical part on the well neck 1, the lower end face of the embracing ring 3 is attached to the upper end face of the annular wedge block 2, and a plurality of pull rings 31 are uniformly arranged on the outer ring of the embracing ring 3; the number of the pull rings 31 is the same as that of the steel bars 11, and ropes 32 are arranged on the inner rings of the pull rings 31; after the well neck 1 is attached to the annular wedge 2, the rope 32 on the pull ring 31 is bound to the bending point of the steel bar 11, and the firmness between the well neck 1 and the annular wedge 2 is enhanced again.
As a specific embodiment of the present invention, a fastening bolt 33 is disposed between adjacent pull rings 31; one end of the fastening bolt 33 penetrates through the embracing ring 3 and abuts against the outer ring of the cylindrical part of the well neck 1; rope 32 ties up at billet 11 shang tong, and pull ring 31 and armful ring 3 are pulled to rope 32 for armful 3 inner circles diameter grow, and 3 inner circles of armful ring reduce on well neck 1 between the cylinder position outer lane, through fastening bolt 33 for this reason, will embrace ring 3 and fix on well neck 1 on the cylinder position outer lane, avoid embracing ring 3 and pulled the back, embrace the emergence that ring 3 breaks away from well neck 1 phenomenon.
The working principle is as follows: in the process that the inner ring of the annular wedge block 2 is sleeved on the well neck 1, the annular wedge block 2 is suspended above the well neck 1 through a crane, then each steel bar 11 on the well neck 1 is aligned with each through hole 21 on the annular wedge block 2, then the annular wedge block 2 is gradually and slowly descended until the annular wedge block 2 is attached to the well neck 1, and then each steel bar 11 is bent by 90 degrees along the upper surface of the annular wedge block 2, so that the steel bars 11 are attached to the upper surface of the annular wedge block 2; annular voussoir 2 is tied on well neck 1 by billet 11 this moment, has increased the fastness between well neck 1 and the annular voussoir 2, and when needs were to well neck 1 adjustment position, through hoisting annular voussoir 2, well neck 1 also rises along with annular voussoir 2, makes things convenient for the adjustment of well neck 1 position.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (8)

1. The reverse grooving construction method for the rapid inspection well of the PC piece is characterized by comprising the following steps of: the construction method comprises the following steps:
s1: design drawing construction deepening, well neck wedge block BIM design
(1) Deepening an inspection well construction drawing, and carrying out construction deepening design on a well body, a well shaft, a well chamber surface layer and a pipe hoop joint large sample, so as to determine materials and a construction method;
(2) on the premise of acquiring an owner unit and a design unit, optimally designing the upper structure of the shaft, namely designing a well neck and a matched annular wedge block by using a BIM technology, and sending design data to a PC (personal computer) processing factory for production;
s2: construction of inspection well foundation and pouring of bottom plate
(1) The inspection well coordinate information marked in the foundation design drawing is used for releasing the open outer edge line of the inspection well by using a total station and a theodolite and reserving the width of the working surface;
(2) before the foundation trench is excavated, effective protection measures are taken for surrounding structures and underground pipeline facilities, the foundation trench is really well known to be harmonious, construction and precipitation are well done, and the safety of the surrounding structures and the underground pipeline facilities is fully ensured;
(3) when the bottom plate is constructed, the cushion layer is firstly poured on the prefabricated bottom plate and the cast-in-place bottom plate, and the thickness and the material of the prefabricated bottom plate and the cast-in-place bottom plate meet the design requirements;
(4) when the bottom plate is constructed, the requirements of design and standard specification are met by steel bar binding, concrete pouring and maintenance;
s3: building well body and backfilling periphery, and sealing well mouth with thick steel plate
(1) The inspection well is mostly built by wedges, stones and prefabricated well pipe connecting members of various specifications, before building, a block arrangement deepening design is made by adopting a BIM technology, attention is paid to arrangement of the wedges at the well pipe connecting members, and a block arrangement diagram is required to be arranged after deepening to guide construction;
(2) when the elevation difference between the elevation of the branch pipe and the branch pipe which are connected into the inspection well and the elevation difference between the elevation of the main pipe do not meet the height modulus of the standard wedge block, the thickness of masonry mortar is not adjusted and is larger than 20 mm; when the thickness of the masonry mortar is more than 20mm, adjusting by using a wedge block;
(3) the mortar used for building the inspection well is accurately metered and stirred according to the mixing ratio provided by a laboratory and approved by a supervision engineer, and the corresponding indexes meet the design and specification requirements;
(4) the wedge blocks are constructed in staggered joints, horizontal and vertical masonry mortar is full and dense, mortar joints are uniform, the thickness is between 8mm and 12mm, the mortar fullness is greater than 95%, through joints and blind joints cannot occur, water flushing grouting and crack pouring are strictly forbidden, and a scaffold is strictly forbidden to be arranged on the masonry;
(5) the landscape connecting members and the reserved branch pipes are installed according to the visual reservation requirement during masonry, and the pipe diameter, the direction, the elevation and the like meet the design requirement; the pipe orifice at the inner side of the reserved branch pipe is preferably constructed by low-strength cement mortar, and the distance between the pipe orifice and the inner wall of the well is more than 100 mm;
(6) the inner stair steps of the inspection well are required to be installed along with the building, the positions are accurate, and the inner stair steps of the inspection well cannot be stepped before the building mortar does not reach the specified compressive strength after the inner stair steps are installed;
(7) before backfilling is carried out on the periphery of the inspection well, pointing and seepage prevention of the inspection well are finished and meet quality requirements; the inspection well backfilling is carried out by adopting an artificial layered symmetrical backfilling method, the layered thickness of the inspection well backfilling is between 13 and 15cm, and the inspection well backfilling is tamped by a small tamping machine after being paved manually until the inspection well backfilling is flush with the surface of the well mouth of the inspection well;
(8) after the inspection well is backfilled, a thick steel plate with the same size as the outer frame of the well head wedge block or the same diameter of the outer frame is used for covering and sealing, and fine stone concrete is adopted around the steel plate to prevent the steel plate from loosening and deviating during operation of a construction machine;
(9) after the thick steel plate seals the well mouth, a mark is made nearby so as to determine reverse grooving of the position at a later stage;
s4: construction of road sub-base
(1) Measurement and paying-off and preparation:
a. after the roadbed is finished, the measuring pile is immediately recovered, and the deflection value is tested according to the design requirement;
b. recovering center line piles according to the distance of 10m, externally arranging indicating piles on both side lines, making an obvious loose pavement thickness mark on the indicating piles, considering the loose pavement thickness between 2 and 3 percent, adjusting the loose pavement thickness on site in actual construction, controlling the error of the loose pavement thickness elevation between-2 and +5mm, strictly forbidding collision marks during the whole operation period, cleaning a lower bearing layer after construction lofting, and sprinkling water for wetting before loading to ensure that the lower bearing layer is moist without water accumulation;
(2) transportation of mixed materials
a. When the mixed materials are charged, the dump truck moves to a position once when loading one bucket of materials, and one bucket of materials is charged for three times according to the front part, the middle part and the rear part of the carriage to prevent segregation;
b. transporting the mixture to a construction site by adopting a 15t dump truck, requiring a truck container to be clean, and controlling the traveling speed within 30 km/h;
c. the transport vehicle must be commanded by a specially-assigned person and runs according to a specified line, and the rapid braking and the rapid turning on the paved subbase and the base layer are strictly forbidden, and the speed of the transport vehicle is preferably slow so as to reduce the uneven rolling and the rutting;
(3) and cushion layer construction
a. Paving broken stones by adopting a paver, and manually matching and supplementing materials in places where local machines cannot be paved;
b. before paving, firstly, a measurer checks according to a rechecked level point and a control pile, and a paver is required to keep a proper speed to run at a constant speed in the paving process and is not required to be interrupted; the measuring personnel can detect and adjust the elevation, the cross slope and the flatness index at any time;
c. when rolling, the steel wheel road roller stabilizes the pressure once, and then uses static pressure for 2-3 times.
(4) Test section of subbase layer and base layer
a. Preparation work: before paving, the lower bearing layer is refitted and cleaned; when the lower bearing layer is paved, the defects of the lower bearing layer are firstly processed, the lower bearing layer is cleaned, the height, the width and the cross slope of the top surface of the processed lower bearing layer meet the standard requirements, the surface is smooth and solid, no loose or weak place exists, the side line is measured and placed after the surface is qualified, the central line is recovered, one pile control elevation is arranged at every 10m of the straight line section, and one pile control elevation is arranged at every 5m of the flat curve section;
b. paving a test section: before formal construction, construction of a test section is carried out, and preparation is made for scale construction; after the lower bearing layer is detected to be qualified and the approval of a supervision engineer is reported, a road section of 100m is selected for construction of a test section; through the construction of the test section, the reasonable personnel allocation, equipment combination, the structure layer mixing ratio, the loose paving coefficient, the compaction procedure, the compaction times and the compaction process which enable the mixture to reach the specified compaction degree when the water content is optimal are determined, and the proper length of each operation section and the proper thickness of one-time paving are determined;
(5) spreading the mixture
a. Spreading the mixture by using a spreading machine, and manually matching and supplementing materials in places where local mechanical spreading cannot be performed;
b. when the mixture is spread by using the spreading machine, the process is not interrupted, if the interruption time exceeds 2 hours due to reasons, a transverse seam is arranged, and the spreading machine is driven away from the tail end of the mixture;
c. checking and determining the top elevation of the template; in the paving process, the paver is required to keep a proper speed to run at a constant speed, and is not suitable to be interrupted; testing personnel need to detect the mixture ratio and the dosage of finished materials at any time and feed back the mixture ratio and the dosage to a mixing station in time; the measuring personnel can detect the elevation index, the horizontal index and the flatness index at any time and adjust the elevation index, the horizontal index and the flatness index in time.
d. A specially-assigned person is arranged behind the paver to eliminate segregation of coarse and fine aggregates, shovel off local coarse aggregate pits and fill the pits with a newly-mixed mixture;
(6) compacting of the mix
a. The rolling of the mixture is carried out according to the process confirmed in the test section and approved by a supervisory engineer; after paving and forming the mixture, when the water content is higher than 0.5-1% of the water content, immediately rolling in a full-width range, wherein the length of the rolled section is determined according to the air temperature condition;
b. when rolling, firstly stabilizing the pressure once by a steel wheel roller, then rolling for 3-5 times by a vibration roller, and finally compacting once by a rubber wheel roller;
c. the spread and shaped mixture is immediately compacted in the full-width range, rolling is finished on the same day, water is added when the water content of the mixture is lower than the design requirement, and airing is carried out when the water content of the mixture is higher than the design requirement so that the water content of the mixture reaches the construction requirement, and then rolling is carried out;
d. strictly forbidding the road roller to turn around and brake suddenly on a finished or rolling road section so as to keep the spreading layer surface from being damaged, wherein the wheel tracks are overlapped 1/2 wheel widths during rolling, so that the whole thickness and width of each layer are completely and uniformly compacted to the specified compaction degree;
e. in the compaction process, each working surface ensures that one rubber-tyred road roller carries out final pressing so as to solve the problem of fine cracks on the surface after the mixture is compacted;
f. leaving 5-8 m of a joint after one road section is finished without paving and rolling, and paving and rolling the non-construction part of the previous section and the next section during the construction of the next section; the mixture which is not compacted is removed and replaced by rain;
(7) and joint treatment
a. And (3) transverse seaming: when the transverse joint is arranged, the land leveler is driven away from the tail end of the mixture, the tail end of the mixture is manually tidily arranged, two square timbers with the same thickness as the mixture are placed against the mixture, the mixture of the square timbers is tidily arranged, the other side of each square timbers is backfilled with gravel and broken stones for 2.5-3m, the height of each square timbers is 2-5cm higher than that of each square timbers, and then the mixture is rolled and compacted;
b. longitudinal seaming: paving once for each single frame, not setting longitudinal joints, setting vertical longitudinal joints when the special-shaped section is unavoidable, wherein the joints need to be vertically connected, strictly prohibiting oblique stubbles, and adopting a processing method that when one frame is constructed in the previous section, a square timber or steel template is used for supporting one side close to the center, and the heights of the square timber and the steel template are the same as the thickness of the underlayer; after the mixture is mixed, manually shaping and rolling a part close to the support wood, and after the curing is finished, removing the support wood before another section is paved;
s5: health preserving and traffic control
(1) After each section of the mixture is rolled, compacted and formed, and the mixture is qualified through compaction degree inspection, watering and curing are immediately started without delay, the curing period is longer than 7 days, the strength of the mixture is subjected to test piece test, the number of the test pieces is larger than the standard requirement, the test pieces are subjected to moisture preservation and health maintenance for 6 days and soaked in water at the specified temperature, and after 1 day, the unconfined compression test is carried out;
(2) in the period of moisture preservation and health maintenance, except that the health maintenance vehicles and the supervision vehicles need to pass at a low speed, the passing and the construction of the previous structural layer of the large mechanical vehicle are strictly forbidden;
s6: digging out the well mouth by reverse grooving, installing well neck and wedge block
(1) According to the pre-reserved mark, the contour range of the wellhead is roughly positioned by using white lime, and the steel plate is excavated by manpower
(2) Removing the steel plate, closing the template along the top of the well wall wedge block, binding reinforcing steel bars, making an elevation control mark, and pouring the upper part of the well mouth to be used as a pressing top for leveling;
(3) the fine stone concrete is thinly paved on the surface of the coping, and then the well neck is adjusted and installed on the coping by a small hoisting tool for stable placement;
(4) after the well neck is installed, hoisting an annular PC wedge block for protecting the well neck, thereby avoiding the damage of road base, later road construction and driving load to the tapered well wall of the well neck;
s7: and (5) secondarily sealing the well neck by using a thick steel plate, and constructing the bottom surface layer of the road.
(1) After the thick steel plate closes the well neck, a mark is made nearby so as to determine reverse grooving of the position at a later stage;
(2) the periphery of the thick steel plate is fixed by fine stone concrete, so that the steel plate is prevented from loosening and deviating during operation of a construction machine;
(3) after the base layer construction is finished, the kerbstone and the kerb are installed, the total station is used for accurately positioning the line during the construction, and the line is hung manually for the setting mortar paving installation;
(4) sealing construction
a. Before slurry sealing is constructed, a pavement surface layer is cleaned, and road teeth, curbs and structures are properly protected to avoid pollution;
b. after the slurry seal layer is sprayed, the slurry seal layer cannot flow and penetrate into the base layer to a certain depth, and an oil film cannot be formed on the surface;
c. 2-3% of 32.5-grade ordinary Portland cement can be added to enhance the binding power between the asphalt and the aggregate and shorten the demulsification time of the modified emulsified asphalt;
d. when the slurry seal paver is used for paving, the slurry seal paver needs to move forward at a constant speed, the paving speed is 100-200 m/min, the surface needs to be smooth, and manual renovation needs to be carried out on local unevenness;
e. after the mixture is paved, continuously rolling for 4-8 times by using an 8-10T tire road roller, and in the rolling process, prohibiting the road roller from suddenly braking without turning around the newly paved mixture;
f. after slurry sealing is constructed, sealing measures are taken, and vehicles and pedestrians are strictly prohibited to pass through;
(5) through layer construction
a. Removing impurities of the base layer out of the roadbed by using a road sweeper;
b. using 9-12m3The/min air compressor blows clean floating dust on the surface of the base layer along the longitudinal direction to expose the aggregate;
c. the permeable layer construction adopts an asphalt spreading vehicle to spray, the height of the oil spraying nozzles is firstly adjusted, so that the same base layer point receives the oil mass of two oil nozzles simultaneously;
d. before large-area construction, a section of test path is made to determine the accuracy of the digital display technical parameters of the asphalt distribution truck, and when the accuracy is correct, the construction parameters are input according to the design;
e. when the asphalt spreading vehicle spreads asphalt, one lane is sprayed next to the other lane, the next lane and the previous lane are not overlapped or slightly overlapped in principle but cannot be exposed, and the exposed part needs to be sprayed by manual spraying equipment; after the spraying vehicle finishes spraying a lane and stops, the asphalt dropping from the oil drain pipe is immediately received by the oil groove to prevent excessive local asphalt, and if the local part still has redundant permeable asphalt and does not permeate into the base layer, the asphalt is timely removed;
f. in order to prevent the uneven oil spreading quantity at the beginning and the end, the base layer is covered by color strip cloth at the beginning and the end of spreading;
(6) construction of adhesive layer
a. Before the adhesive layer asphalt is sprayed, cleaning the asphalt by using a road sweeper once, and blowing off dust in the gap of the lower layer by using an air compressor of 9-12m 3/min;
b. the adhesive layer is sprayed by an asphalt spraying vehicle, and the nozzles and the oil spraying pipes are preheated before spraying, so that each nozzle and each oil spraying pipe are ensured to be free from blockage; adjusting the spray angle of the nozzles to ensure that the spray fans of the adjacent nozzles can be slightly overlapped at the lower angle;
c. spraying asphalt on lanes one by one, and controlling the overlapping of adjacent spraying belts by 10-15cm in order to ensure no leakage;
d. the spraying is uniform, the oil injection quantity is strictly controlled, the spraying quantity is small and not large, and oil pockets are not allowed to appear;
e. when the asphalt concrete is spread, if the asphalt concrete is adhered by an asphalt concrete truck and a sticky layer is broken in rainy days, manual filling and sprinkling are carried out in time;
f. after the spraying of the sticky layer emulsified asphalt is finished, a sealing measure is taken, and other vehicles and pedestrians except the asphalt mixture transportation vehicle are strictly forbidden to pass through;
s8: and digging out the upper opening of the well neck through the secondary reverse grooving, and installing a well ring and stabilizing the well ring by using a transition concrete material.
(1) According to the pre-reserved mark, the periphery of the outline size of the steel plate is expanded by 30cm outwards to serve as a boundary, the excavation range is roughly positioned by using white lime, and then manual reverse excavation is carried out to dig out the steel plate;
(2) the excavation depth of the reverse grooving penetrates through the bottom surface layer to reach the upper surface of the bottom base layer;
(3) firmly installing the well cover on the well neck according to the requirements of product specifications and design specifications;
(4) determining the strength grade of the early strength concrete poured back to the bottom layer excavation part by the calculation of a designed unit, and leveling the early strength concrete poured back to the bottom layer excavation part;
(5) the concrete is well maintained, and the next procedure cannot be carried out before the strength does not meet the design requirement;
s9: road surface layer construction
(1) And paving test section
Before formal paving, selecting a representative road section with the length of more than 200m to carry out test section construction; through tests, the proper loose paving coefficient, paving and rolling temperature, rolling times and mixing proportion of the mixture are determined, and meanwhile, whether construction organization, construction process, mechanical equipment and combination are reasonable or not is checked, so that adjustment is carried out according to the reasonable combination, and preparation is provided for spreading and paving comprehensively;
(2) transporting asphalt concrete
a. The asphalt mixture is transported by a 15t dump truck, and the material transporting truck is covered by tarpaulin for heat preservation, rain prevention and pollution prevention; when the asphalt is on site, the temperature of the hot asphalt concrete is required to meet corresponding requirements, the high temperature is less than 165 ℃, the paving of the asphalt concrete is carried out in sunny weather, and the asphalt concrete cannot be paved in rainy days;
b. in order to prevent the asphalt mixture from being bonded, a layer of oil-water mixed liquid is coated in the carriage, but residual liquid cannot be accumulated at the bottom of the carriage; the number of the transport vehicles is determined according to the paving speed on site, and the paving is ensured to be continuously carried out;
c. the mixture transported to the site should be subjected to temperature measurement and appearance inspection by a special person; if the temperature is unqualified, or the flower is white, the cluster is formed, the color is withered, brown and dark, and the product is exposed to rain, the product is discarded and cannot be used;
d. in the continuous paving process, the material conveying vehicle should stop 10-15cm in front of the paver and cannot impact the paver; hanging a neutral gear and pushing the front part to advance by a spreading machine;
(3) concrete paving
a. The temperature of the mixture is strictly controlled during construction, the mixture cannot be paved when the ground temperature is lower than 15 ℃, effective measures are taken when the mixture needs to be paved, and construction can be carried out after the supervision engineer agrees;
b. the paving speed is coordinated with the supply quantity of the mixture, is controlled to be 2-4 m/min, and is balanced and continuous, so that the time is not fast, the time is not slow, and the midway is not stopped; the paving speed of the paver is actually controlled by the mixing yield and the transport capacity, and meanwhile, the paver must be matched with the rear bin, so that the walking speed is not more than 3 m/min, the phenomenon that the paver stops waiting for materials on a certain section and the temperature of a mixture below the paver is reduced, the compaction of the mixture is influenced, and the local leveling speed is not good is prevented;
c. the paving thickness is the designed thickness multiplied by the loose paving coefficient, the thickness, the cross slope and the road arch of the paving layer are checked at any time in the paving process, the average thickness is checked according to the ratio of the total amount of the paving mixture to the area, and the average thickness is adjusted at any time when the average thickness is not in accordance with the requirement;
d. the paver is located at a machine point 1 hour before paving, the front end of the paver stretches out of the cross rod sling chain to be aligned to a walking base line of the paver, and the base line is well drawn before paving. The rear end of the paver pads the ironing plate to the elevation of the virtual paving surface by using a cushion block; after the preparation, starting a gas heating system of the paver to fully preheat the screed plate; the paver controls the elevation of two ends of the screed plate by adopting a bilateral sensor mode, and after the initial position of the sensor is adjusted, the screed plate walks on an aluminum alloy ruler with a preset distance of 5 meters;
e. paving temperature is determined according to trial paving, and construction temperature is controlled to be 135-145 ℃;
f. the quality of the paving material should be tracked and detected during paving, and the defects should be repaired when the paving material is hot when found; removing the re-paved layer when the repair is not good;
(4) rolling the asphalt concrete surface layer
a. Initial pressing: firstly, a middle and light static steel wheel road roller with 8-10 t is adopted and is carried out after being closely attached to a paver; the rolling speed is coordinated with the paving speed, the rolling speed is controlled to be 1.5-2 km/h, the rolling times are controlled to be 1-2 times, and a vibratory roller is adopted to stop vibrating or carry out rolling under the micro-vibration state;
b. repressing: adopting a vibratory roller with the weight of more than 18t, and carrying out primary rolling at the rolling temperature of more than 120 ℃; the rolling speed is controlled to be 2.5-4 km/h, the rolling times are 2-3 times, and the rolling speed is determined by field tests;
c. final pressure: and rolling by using an 18t static steel wheel road roller, wherein the rolling temperature is controlled to be more than 105 ℃, and the rolling times are 1-2 times until wheel tracks left in the re-pressing process are eliminated.
2. The reverse grooving PC member quick inspection well construction method according to claim 1, wherein: BIM technique carries out well neck and supporting annular voussoir design among S1, and this well neck and supporting annular voussoir BIM design point:
(1) the lower opening of the well neck is required to determine the corresponding thickness according to the designed wall thickness of the shaft;
(2) the design of the upper opening of the well neck is to make the tongue-and-groove design of the corresponding part by considering the size and tolerance standard of the well lid of the national walling crib, and properly enlarge the tolerance size so as to facilitate the later installation of the walling crib;
(3) the annular wedge blocks are not made into pure concrete structures, and reinforcing steel bars are also arranged to enhance the integral pressure resistance.
3. The reverse grooving PC member quick inspection well construction method according to claim 1, wherein: detecting various indexes such as flatness, road arch transverse slope, compactness, strength and the like after the test section in the S4 paving test section is finished, and reporting the test section for supervision and approval if the test section meets the requirement; otherwise, the construction of the test section is abandoned by self until the test section is qualified.
4. The reverse grooving PC member quick inspection well construction method according to claim 1, wherein: in the final pressing stage of S9, an anti-sticking agent is constructed on the rolling wheel in the rolling process to prevent the asphalt mixture from adhering to the rolling wheel, the road roller tries to be stable when starting, and the rolling speed is balanced and consistent; in the rolling process, turning and turning are reduced, turning can be used for braking, and the turning and turning can be carried out slowly and stably when the turning and the braking are required.
5. The reverse grooving PC member quick inspection well construction method according to claim 1, wherein: a plurality of steel bars are uniformly arranged on the curved surface of the well neck, one end of each steel bar is fixedly connected to the middle of the curved surface, and the length of each steel bar is greater than the height of the well neck; a plurality of through holes are uniformly formed in the end face of the annular wedge block; each through hole is in one-to-one correspondence with the steel bar at the position of the annular wedge block, the other end of the steel bar penetrates through the through hole, the through hole is bent by an angle of 90 degrees and is bent towards the periphery of the annular wedge block, and the bending point is located on the upper end face of the annular wedge block.
6. The reverse grooving PC member quick inspection well construction method according to claim 5, wherein: the water-absorbing expansion rubber is arranged at the fixedly connected position of the steel bar and the well neck; the water-absorbing expansion rubber is adhered to the surfaces of the steel bars and the well neck, a chamfer is arranged at the upper end of the water-absorbing expansion rubber, and a layer of plastic film for isolating water is wrapped on the surface of the water-absorbing expansion rubber.
7. The reverse grooving PC member quick inspection well construction method according to claim 5, wherein: an embracing ring is arranged on the outer ring of the cylindrical part of the well neck; the inner ring of the embracing ring is sleeved on the outer ring of the cylindrical part on the well neck, the lower end surface of the embracing ring is attached to the upper end surface of the annular wedge block, and a plurality of pull rings are uniformly arranged on the outer ring of the embracing ring; the number of the pull rings is the same as that of the steel bars, and ropes are arranged on the inner rings of the pull rings.
8. The reverse grooving PC member quick inspection well construction method according to claim 7, wherein: a fastening bolt is arranged between the adjacent pull rings; and one end of the fastening bolt penetrates through the embracing ring and abuts against the outer ring of the cylindrical part of the well neck.
CN202011056452.3A 2020-09-30 2020-09-30 Reverse-slotting PC (polycarbonate) member rapid inspection well construction method Active CN112144573B (en)

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CN113152526A (en) * 2020-12-30 2021-07-23 中冶天工集团有限公司 Reverse grooving installation construction process for manhole cover of inspection well
CN113174815A (en) * 2021-04-29 2021-07-27 中交二公局第六工程有限公司 3D intelligent digital paving compaction system and compaction method for pavement construction
CN113202142A (en) * 2021-04-26 2021-08-03 湖南省绿林建设集团有限公司 Composite asphalt pavement inspection well protection device and pavement construction method

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CN104499504A (en) * 2014-11-25 2015-04-08 中铁四局集团第三建设有限公司 Road inspection well and construction method thereof
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CN113152526A (en) * 2020-12-30 2021-07-23 中冶天工集团有限公司 Reverse grooving installation construction process for manhole cover of inspection well
CN113202142A (en) * 2021-04-26 2021-08-03 湖南省绿林建设集团有限公司 Composite asphalt pavement inspection well protection device and pavement construction method
CN113174815A (en) * 2021-04-29 2021-07-27 中交二公局第六工程有限公司 3D intelligent digital paving compaction system and compaction method for pavement construction

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