CN212477997U - Structure for preventing surrounding pavement of urban road drainage inspection well from sinking - Google Patents
Structure for preventing surrounding pavement of urban road drainage inspection well from sinking Download PDFInfo
- Publication number
- CN212477997U CN212477997U CN201922330268.2U CN201922330268U CN212477997U CN 212477997 U CN212477997 U CN 212477997U CN 201922330268 U CN201922330268 U CN 201922330268U CN 212477997 U CN212477997 U CN 212477997U
- Authority
- CN
- China
- Prior art keywords
- roller compacted
- compacted concrete
- concrete
- lower floor
- inspection shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Road Paving Structures (AREA)
- Road Repair (AREA)
Abstract
The utility model provides a prevent structure that road surface subsides around urban road drainage inspection shaft, be provided with roller compacted concrete layer around the inspection shaft, roller compacted concrete layer includes upper roller compacted concrete and lower floor roller compacted concrete, lower floor roller compacted concrete is located the subbase top of road surface, upper roller compacted concrete is located asphalt concrete surface layer below, upper roller compacted concrete and lower floor roller compacted concrete side and the semi-rigid basic unit butt of road surface, upper roller compacted concrete and lower floor roller compacted concrete are the wrong platform form, the inspection shaft is located roller compacted concrete layer central point, the utility model discloses a roller compacted concrete replaces ordinary concrete, has improved resistance to compression and bending strength, has reduced the shrinkage, resists and adjusts inhomogeneous settlement ability reinforce; the construction operation is fast, the construction period is short, the maintenance time is short, and the investment of equipment and manpower is reduced; the fly ash is doped into the roller compacted concrete, so that the cost is reduced, the fly ash is utilized, the environmental pollution is reduced, and the social benefit is higher.
Description
Technical Field
The utility model relates to a city construction technical field specifically is a prevent structure of road surface subsidence around urban road drainage inspection shaft.
Background
In the modern urban road construction process, the common pavement structure layer is formed by a lime-flyash gravel base layer and an asphalt concrete surface layer. Under the common pavement structure form, the pavement around the drainage inspection well has cracks or settlement phenomena easily caused by insufficient rolling compaction degree due to the fact that backfill materials are difficult to compact. This is a common quality problem in urban road construction.
At present, common concrete is mostly adopted for reinforcing a well ring in the scheme of reinforcing the periphery of an inspection well, in the process of constructing a pavement at the position of the inspection well, a building block inspection well is firstly built to the bottom elevation position of a pavement base layer, then a 2cm thick steel plate covers the inspection well mouth, then the pavement base layer at the position of the inspection well and the pavement base layers at other positions of a road are together paved, the construction of the pavement base layer is finished, a reverse grooving structural layer is arranged at the position of the inspection well, the surrounding pavement base layer is broken, the broken range is 50cm around the inspection well, the inspection well is lifted to the top elevation of the pavement, then concrete is poured in the range of 50cm around the inspection well for reinforcing the periphery of the pavement base layer, the concrete is poured to the top elevation position of the pavement. And after the construction of the reinforced concrete around the well is finished, beginning to construct the asphalt concrete of the pavement surface. The method has the advantages of slow construction progress and long concrete curing time.
SUMMERY OF THE UTILITY MODEL
The utility model discloses make the improvement to the problem that above-mentioned prior art exists, promptly the utility model provides a prevent structure that urban road drainage inspection shaft road surface subsides around.
In order to solve the technical problem, the utility model provides a prevent structure of road surface subsidence around urban road drainage inspection shaft, be provided with roller compacted concrete layer around the inspection shaft, roller compacted concrete layer includes upper roller compacted concrete and lower floor roller compacted concrete, lower floor roller compacted concrete is located the subbase top on road surface, upper roller compacted concrete is located asphalt concrete surface course below, upper roller compacted concrete and lower floor roller compacted concrete side and the semi-rigid basic unit butt on road surface.
Preferably, upper roller compacted concrete and lower floor roller compacted concrete are square, upper roller compacted concrete and lower floor roller compacted concrete are the wrong platform form, the inspection shaft is located upper roller compacted concrete and lower floor roller compacted concrete central point put, lower floor roller compacted concrete's width ratio the 200cm that the inspection shaft diameter is big, upper roller compacted concrete width ratio the 200cm that lower floor roller compacted concrete width is big, upper roller compacted concrete and lower floor roller compacted concrete's thickness is 20 cm.
Preferably, the upper and lower roller compacted concretes are dry hard poor cement concretes, and are made into dry hard cement concretes without slump by mixing cement, pozzolanic admixture, water, admixture, sand and coarse aggregate controlled by classification and formed into high density and high strength by a vibration roller compaction process.
The utility model discloses beneficial effect for prior art does:
(1) the compressive strength and the flexural strength of the rolled commercial concrete are higher than those of common commercial concrete, the dry shrinkage rate is 10-20% lower than that of the common commercial concrete, the uneven settlement resistance and the uneven settlement adjustment capability are strong, and compared with common semi-rigid base materials such as cement stabilized macadam, lime macadam and the like, the rolled commercial concrete has higher strength, rigidity and integrity, scouring resistance and frost resistance;
(2) the construction progress is fast, the maintenance time is short, the traffic is opened early, the construction period is shortened, and the construction cost is reduced;
(3) a large amount of cement can be saved, and because the rolled commercial concrete can be doped with a certain amount of fly ash, the waste is utilized, the environmental pollution is reduced, and the cost is reduced and the social benefit is higher;
(4) the asphalt concrete surface layer is additionally paved on the roller compacted concrete panel to form a roller compacted concrete and asphalt concrete composite pavement, which is rigid and flexible, not only exerts the advantages of high strength and large bearing capacity of the roller compacted concrete, but also overcomes the impact and vibration of the traveling on the concrete pavement, and improves the comfort and safety of the traveling.
Drawings
FIG. 1 is a sectional view of a structure for preventing the settlement of the road surface around the drainage inspection well of the urban road according to the embodiment of the present invention;
FIG. 2 is a plan view of a structure for preventing road surface subsidence around an urban road drainage inspection shaft according to an embodiment of the present invention;
in the figure:
1. inspection well 2, road subbase 3, road semi-rigid base course
4. The lower layer of roller compacted concrete 5, the upper layer of roller compacted concrete 6 and the asphalt concrete surface layer
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Exemplarily, it is concrete, as shown in fig. 1-2, the utility model provides a prevent structure of road surface subsidence around urban road drainage inspection shaft is provided with roller compacted concrete layer around the inspection shaft 1, roller compacted concrete layer includes upper roller compacted concrete 5 and lower floor roller compacted concrete 4, and lower floor roller compacted concrete 4 is located the subbase 2 top on road surface, and upper roller compacted concrete 5 is located asphalt concrete surface course 6 below, and upper roller compacted concrete 5 and lower floor roller compacted concrete 4 side and the 3 butts of semi-rigid basic unit on road surface.
The preferable scheme is that the upper roller compacted concrete 5 and the lower roller compacted concrete 4 are square, the upper roller compacted concrete 5 and the lower roller compacted concrete 4 are in a staggered platform shape, the inspection well 1 is located in the center of the upper roller compacted concrete 5 and the lower roller compacted concrete 4, the width of the lower roller compacted concrete 4 is 200cm larger than the diameter of the inspection well 1, the width of the upper roller compacted concrete 5 is 200cm larger than the width of the lower roller compacted concrete 4, and the thicknesses of the upper roller compacted concrete 5 and the lower roller compacted concrete 4 are 20 cm.
In a preferred embodiment, the upper roller compacted concrete 5 and the lower roller compacted concrete 4 are dry and hard poor cement concrete, and are made into dry and hard cement concrete without slump by mixing cement, a pozzolanic admixture, water, an additive, sand and coarse aggregates controlled in stages and formed into high density and high strength by a vibratory roller compaction process.
The utility model provides a construction method of a structure for preventing the settlement of the surrounding road surface of an urban road drainage inspection well, which comprises the following steps,
s1: building the building blocks of the inspection well 1 to the bottom elevation position of the pavement base, and sealing the well mouth to perform pavement base construction; preferably, a steel plate with the thickness of 2cm is used for sealing the wellhead;
s2: breaking open grooves in the pavement base layer around the inspection well 1, wherein the shapes of the open grooves are consistent with those of the roller compacted concrete layer; after the breaking operation is finished, cleaning operation is carried out in the open groove;
s3: carrying out well lifting treatment on the inspection well 1, removing the well head sealing cover, continuously carrying out masonry operation on the inspection well to the elevation position of the bottom of the precast concrete well ring, and placing the precast concrete well ring and the cast iron well cover;
s4: after the masonry mortar of the inspection well 1 reaches the design strength, paving roller compacted concrete in the open groove and performing roller compacted operation;
s5: and (5) carrying out asphalt concrete surface layer construction.
Preferably, in step S2, the pavement base around the inspection shaft 1 is manually broken to form a groove by using an air pick, the lower layer is broken to the outer edge 1m around the inspection shaft, the upper layer is broken to the outer edge 2m around the inspection shaft, the shapes of the broken ranges are both squares, a step is arranged between the two layers of base during breaking, the width of the step is 1m, and the height of the step is 20 cm.
Preferably, the roller compacted concrete is the roller compacted concrete with the reference number of C40, and the road surface mix proportion design is calculated by an absolute volume method or an assumed volume-weight method.
There are requirements for the roller compacted concrete as follows,
the quality requirements of raw materials are as follows:
the cement can be selected from common portland cement, slag cement and the like, and the cement with different labels is adopted according to the commercial concrete with different strengths as common commercial concrete;
coarse aggregate, hard, durable and clean broken stone, broken pebble and pebble are used, and grade III coarse aggregate can be used for the ground pavement base layer concrete; the basic technical indexes are as follows: pebble crushing index value is less than 16%; crushed stone crush index value less than 20%; the mud content (by mass) is less than 1.5%, and the firmness (by mass loss) is less than 12%;
the coarse aggregate is continuously graded, and the maximum particle size of the aggregate is generally 15-20mm, and the maximum particle size does not exceed 40 mm. When the roller compacted concrete is constructed in 2 layers, the maximum grain size of the lower-layer aggregate can adopt 40mm, and the maximum grain size of the upper-layer aggregate is preferably 20 mm;
fine aggregate, which is selected from various kinds of sand with hard texture, durability and cleanness, such as river sand, sediment sand, machine-made sand and the like; the technical indexes are as follows: the firmness (by mass loss) is less than 10 percent, the mud content (by mass) of the natural sand and the machine-made sand is less than 3 percent, and the maximum crushing index of a single-particle grade of the machine-made sand is less than 30 percent;
the water requirement is the same as that of the common cement concrete pavement;
the basic technical indexes of the fly ash are as follows: fineness less than 45%, water content less than 1.5%, ignition loss less than 15%, and SO3Less than 3%, etc.
In a preferable scheme, in step S4, after the strength of the masonry mortar and the plastering mortar of the inspection well 1 reaches the design specified strength, a dump truck is used to directly discharge the materials into the tank for pouring and cooperate with manual paving to perform the operation.
Secondly, the design requirement of the mixture ratio is as follows:
the mix proportion of roller compacted concrete has two basic requirements: A. the mortar is of a dense filling type, namely mortar is filled in coarse aggregate gaps to the maximum extent, and mortar is filled in fine aggregate gaps to the maximum extent; B. the rolling property of construction is ensured, namely, the pavement is rolled to the maximum compactness in the construction process, and the slurry can be smoothly extracted to ensure the required flatness of the pavement;
the well periphery treatment adopts C40 roller compacted concrete, and the pavement mix proportion design adopts the traditional design method, namely, the absolute volume method or the assumed volume-weight method to calculate. The W/C is generally between 0.3 and 0.4, the doping amount of the fly ash is preferably not more than 40 percent of the dosage of the cement, an excess substitution method is adopted for doping, the water consumption is adjusted according to the water reducing effect of the fly ash, and the water-cement ratio is adjusted according to the strength requirement. The mixing amount of the fly ash and the substituted cement amount are selected according to the comprehensive requirements of workability, strength, durability and economy, the mixing amount of the fly ash is 60-90 kg/m3 generally, the mixing amount of the fly ash in areas with poor sand sources and poor sand quality can reach 120kg/m3 at most, and the cement amount is about 200-260kg/m 3.
Mixing:
the mixing is carried out by adopting a forced concrete mixer, the water content of the roller compacted concrete is small, the roller compacted concrete belongs to dry and hard concrete, the mixture is not easy to mix uniformly, the mixing time needs to be properly prolonged, the mixing is tried according to the cohesiveness, the homogeneity and the strength stability of the mixture, the shortest pure mixing time is prolonged by 15-20 s compared with that of the common concrete, and the shortest pure mixing time after all raw materials are mixed together is not shorter than 60 s.
Under the general condition, the loss of water evaporation in the construction process is considered, the water consumption is preferably 0.5-0.1% higher than the optimal water consumption, and the mixing water for the concrete is adjusted by combining the water content measured by coarse and fine aggregates according to the standard in the construction process.
Feeding tolerance error: cement, water plus or minus 1%, additive plus or minus 2%, coarse and fine aggregate plus or minus 3%.
When the mixture is mixed, the mixture must be ensured to be uniformly mixed, and the phenomena of non-uniform color and luster, ash strips or ash balls, segregation or agglomeration and the like after the mixture is mixed are avoided, so that the later-stage use quality of the mixture is influenced.
Before the roller compacted concrete construction, the concrete dosage and the appearance mixing uniformity are checked in detail, and the roller compacted concrete is used after the quality of the roller compacted concrete is determined.
Transportation of roller compacted concrete:
the self-discharging truck is suitable for transportation, in order to reduce the consistency loss caused by water evaporation in the transportation process, the truck hopper is kept wet, the transportation distance is preferably 30min, and necessary covering measures are taken.
Paving the roller compacted concrete:
because the consumption of the concrete for treating the periphery of the well is less, a dump truck is adopted to directly discharge the concrete into the tank for pouring during paving, the paving is manually paved, the loose paving coefficient is controlled to be 1.10-1.25, the concrete is paved twice, and the paving of the upper layer concrete is finished before the initial setting of the lower layer concrete.
Rolling and vibrating the roller compacted concrete:
(1) vibrating bottom concrete: the bottom concrete can not be compacted by adopting a vibratory roller due to the narrow working surface, and after paving is finished, the bottom concrete is compacted by adopting an inserted vibrator and a flat vibrator.
(2) And (3) rolling upper layer concrete: and (4) finishing the paving of the bottom concrete, namely paving the upper concrete, and finishing the paving, namely rolling. The rolling is divided into primary pressing, secondary pressing and final pressing, wherein the primary pressing mainly improves the surface compactness and provides a foundation for vibration compaction, and the primary pressing adopts the static pressure of a double-steel-wheel road roller for 2 times. And the re-pressing is to make the whole thickness of the road surface compact to reach the specified compactness, the vibration rolling is carried out by adopting a double-steel-wheel vibration road roller, and the overlapping of the grinding wheels is preferably 1/3-1/2 of the wheel width, so that the indentation can be eliminated, and the flatness can be improved. The number of re-compaction passes is related to the performance of the roller, the mix proportion of the concrete, the thickness of the pavement and the rolling overlap, and is generally 4 passes, namely low frequency first and high frequency second. And a tyre roller is adopted for final pressing, so that the indentation and fine cracks of the steel wheel can be eliminated, and the rolling is generally carried out for 2 times.
Wherein: the rolling speed of the initial pressing, the re-pressing and the final pressing is 1.0-1.5 km/h. The vibratory roller should roll from a low position to a high position, the rolling times of all parts are the same, no pressure leakage is caused, the roller must run straight at a constant speed during rolling, no speed change or parking is required, and the roller must be stopped firstly when parking and reversing under special conditions.
And for the part which cannot be mechanically rolled near the periphery of the well, an inserted vibrator is adopted to be combined with a flat vibrator for vibration compaction.
And curing the roller compacted concrete:
and after the rolling is finished, covering in time for watering and maintaining, wherein the maintaining time is not less than 7 days.
Eighthly, constructing the asphalt concrete pavement:
and after the roller compacted concrete is cured, constructing the asphalt concrete pavement.
In a preferable scheme, in the step S4, the loose paving coefficient is 1.10-1.25, the roller compacted concrete is paved twice, and the paving operation of the upper layer concrete 5 is performed before the initial setting of the lower layer concrete 4.
In a preferred embodiment, in step S4, the lower layer roller compacted concrete 4 is compacted by using an insertion vibrator and a flat vibrator.
Preferably, in step S4, after the paving operation of the upper layer roller compacted concrete 5 is completed, the rolling operation is divided into a first pressing operation, a second pressing operation and a final pressing operation, wherein the first pressing operation is performed by a double-steel-wheel roller for static pressure, the second pressing operation is performed by a double-steel-wheel vibratory roller for vibratory rolling, the final pressing operation is preferably performed by a tyre roller, and for the mechanical non-rolling part near the inspection well periphery, an insertion type vibrator is used in combination with a flat vibrator for vibratory compaction.
According to the technical scheme, the roller compacted concrete is adopted to replace common concrete, so that the compression strength and the flexural strength are improved, the shrinkage rate is reduced by 10-20%, and meanwhile, the non-uniform settlement resisting and adjusting capacity is high, and the roller compacted concrete has high strength, rigidity and integrity, and scouring resistance and freezing resistance; secondly, the construction operation is fast, the construction period is short, the maintenance time is short, the investment of equipment and manpower is reduced, and the traffic is opened early; in addition, a certain amount of fly ash is mixed in the roller compacted concrete, so that the waste of the fly ash is utilized while the cement is saved and the cost is reduced, the environmental pollution is reduced, and the social benefit is higher.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.
Claims (2)
1. The utility model provides a prevent structure of road surface subsidence around urban road drainage inspection shaft, be provided with roller compacted concrete layer around the inspection shaft, its characterized in that, roller compacted concrete layer includes upper roller compacted concrete and lower floor roller compacted concrete, lower floor roller compacted concrete is located the subbase top on road surface, upper roller compacted concrete is located asphalt concrete surface course below, the semi-rigid basic unit butt on upper roller compacted concrete and lower floor roller compacted concrete side and road surface.
2. The structure for preventing the settlement of the road surface around the urban road drainage inspection shaft according to claim 1, wherein the upper layer roller compacted concrete and the lower layer roller compacted concrete are square, the upper layer roller compacted concrete and the lower layer roller compacted concrete are in a staggered platform shape, the inspection shaft is positioned at the central positions of the upper layer roller compacted concrete and the lower layer roller compacted concrete, the width of the lower layer roller compacted concrete is 200cm larger than the diameter of the inspection shaft, the width of the upper layer roller compacted concrete is 200cm larger than the width of the lower layer roller compacted concrete, and the thickness of the upper layer roller compacted concrete and the thickness of the lower layer roller compacted concrete are 20 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922330268.2U CN212477997U (en) | 2019-12-23 | 2019-12-23 | Structure for preventing surrounding pavement of urban road drainage inspection well from sinking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922330268.2U CN212477997U (en) | 2019-12-23 | 2019-12-23 | Structure for preventing surrounding pavement of urban road drainage inspection well from sinking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212477997U true CN212477997U (en) | 2021-02-05 |
Family
ID=74414309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922330268.2U Active CN212477997U (en) | 2019-12-23 | 2019-12-23 | Structure for preventing surrounding pavement of urban road drainage inspection well from sinking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212477997U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111005436A (en) * | 2019-12-23 | 2020-04-14 | 中冶天工集团有限公司 | Structure for preventing surrounding pavement of urban road drainage inspection well from sinking and construction method |
-
2019
- 2019-12-23 CN CN201922330268.2U patent/CN212477997U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111005436A (en) * | 2019-12-23 | 2020-04-14 | 中冶天工集团有限公司 | Structure for preventing surrounding pavement of urban road drainage inspection well from sinking and construction method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109914178B (en) | Construction method for integrally paving road by using bio-enzyme curing material | |
| CN101619557B (en) | Pavement base course material prepared from brick mixed building rubbish regenerated aggregate and preparation method thereof | |
| CN110528350B (en) | Municipal road construction method | |
| CN111764216A (en) | Construction method and application of fabricated concrete road plate | |
| CN111005436A (en) | Structure for preventing surrounding pavement of urban road drainage inspection well from sinking and construction method | |
| CN111517734A (en) | Low-crack cement stable-graded broken stone base material and preparation and construction methods thereof | |
| KR100836704B1 (en) | Composition for soil pavement and pavement method for using the same | |
| CN112359688A (en) | Construction method for in-situ cold regeneration of highway cement stabilized macadam base | |
| CN212477997U (en) | Structure for preventing surrounding pavement of urban road drainage inspection well from sinking | |
| KR100203990B1 (en) | Methods of paving road and of manufacturing sidewalk blocks using waste cement concrete | |
| JPH05255908A (en) | Manufacture of improved water-permeable concrete structure | |
| CN113213883A (en) | Reclaimed water stabilizing material prepared from waste earthwork and construction method thereof | |
| CN103195051B (en) | Limestone soil and pervious concrete pile composite foundation and treatment method thereof | |
| CN113123187A (en) | Waste concrete fist stone pavement base and preparation method thereof | |
| CN112501976A (en) | Construction method of high-strength permeable concrete for non-motor vehicle lane | |
| CN213115347U (en) | Dampproof ground | |
| CN109797621A (en) | A kind of high-strength composite road surface and its construction technology | |
| JPH08231283A (en) | Water-permeable block and its production | |
| CN113831089A (en) | Cement concrete curb containing brick-concrete building garbage recycled aggregate and preparation method thereof | |
| CN113774746A (en) | Pretensioned prestressed concrete assembled pavement and preparation method thereof | |
| CN114717900B (en) | Color permeable integral pavement for high-speed service area and construction method | |
| Grubeša et al. | Properties and applicability of pervious concrete for paving flags | |
| KR20060101703A (en) | The construction method of the playground floor for children | |
| CN213173171U (en) | Road structure composed of fluid solidified soil | |
| CN108532985A (en) | Foundation beam board construction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |