CN112575819A - Manhole cover reinforcing structure and method anchored by using dowel bars and existing pavement foundation - Google Patents
Manhole cover reinforcing structure and method anchored by using dowel bars and existing pavement foundation Download PDFInfo
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- CN112575819A CN112575819A CN202110197248.1A CN202110197248A CN112575819A CN 112575819 A CN112575819 A CN 112575819A CN 202110197248 A CN202110197248 A CN 202110197248A CN 112575819 A CN112575819 A CN 112575819A
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- well lid
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- well
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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
- E02D29/14—Covers for manholes or the like; Frames for covers
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F5/06—Gully gratings
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- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention provides a construction technology of a road foundation project, in particular to a well lid reinforcing structure and a method for anchoring an existing road foundation by using dowel bars, which are arranged at a well opening of a sewer and used for reinforcing a well lid support of the existing road, wherein the well lid reinforcing structure comprises: the well lid support is supported by concrete pouring, and the concrete has stronger compressive capacity, so that the stability of the reinforced well lid support can be effectively improved, the road is smooth and attractive, the smoothness of the existing road surface and the driving comfort are ensured, and the traffic safety and the service level of urban roads are improved; meanwhile, the maintenance rate of quality defects caused by the quality problem of the well cover in the later period is reduced, the maintenance cost in the later period is saved, the influence of the closed period of the road construction on the surrounding social environment is reduced, the influence of maintenance waste on the surrounding environment is reduced, and better economic and social benefits are obtained.
Description
Technical Field
The invention belongs to the technical field of road foundation engineering construction, and particularly relates to a manhole cover reinforcing structure and method anchored by using dowel bars and an existing pavement foundation.
Background
At present, lime stabilized soil, lime fly ash stabilized macadam and cement stabilized macadam are adopted as basic structures for most urban roads in China, asphalt concrete is used as a road surface layer structure, and the method belongs to the design of a semi-rigid plate bearing structure. The inspection well in the road is based on reinforced concrete, concrete blocks or brick masonry is used as a well body, 2:8 of gray soil or graded gravel is used for backfilling around the well, reinforced concrete prefabrication or blocks (bricks) are used for building a well neck, a nodular cast iron well ring (cover) is wrapped by C30 concrete with the width of 30-50 cm and the thickness of 25cm, and the thickness of 4cm is reserved for constructing an asphalt concrete surface layer structure, and belongs to the design of a rigid structure. The asphalt concrete lap joint is adopted between the two structural forms of the road and the inspection well, once the rigid and flexible structures are not uniformly settled, the lap joint of the asphalt concrete is easily sheared and damaged under the action of dynamic load, or the surface layer at the position is cracked due to the reasons that the backfill soil (surface layer) around the well is not compacted, the pouring is not complete, the mortar strength is not enough, the well cover is not installed according to the requirement and the like. If the repair is not performed in time, rainwater enters the road base layer, and the damaged surface is gradually enlarged.
Traditional well lid method makes and utilizes red brick to adjust well head elevation to support the well lid support, because the compressive capacity of red brick is relatively poor, through the vehicle often rolls, the sinking phenomenon still can appear in the well lid after the repair.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and designs a structure and a method capable of reinforcing a well lid support.
In order to achieve the above purpose, the invention provides the following technical scheme:
the utility model provides an utilize dowel bar and existing road surface basis anchored's well lid reinforced structure, sets up in sewer well head department, consolidates the well lid support of existing road surface, well lid reinforced structure includes:
the manhole cover support is correspondingly arranged at the manhole opening of the sewer so as to install a manhole cover;
the annular cutting groove surrounds the well lid support;
the well cover ring rib is matched with the annular cutting groove, is correspondingly placed in the annular cutting groove and is positioned below the well cover support;
the support cushion template is arranged at the well mouth of the sewer, supports the well lid support and is used as a template for sealing a gap between the well lid support and the well mouth of the sewer;
the dowel bars penetrate through the well lid support and extend into the well lid ring ribs to serve as prefabricated components to connect the well lid support and the well lid ring ribs;
and concrete is poured in the annular cutting groove, so that the well cover support, the well cover ring rib and the dowel bar form a whole.
In the manhole cover reinforcing structure anchored with the existing pavement foundation by using the dowel bars, preferably, the support template is an air bag, and the air bag is provided with a valve capable of being inflated or deflated.
Utilize well lid reinforced structure of dowel bar and existing road surface basis anchor as above, preferably, well lid reinforced structure still includes:
and the asphalt spreading layer is spread above the concrete, and the upper surface of the asphalt spreading layer and the existing road surface are positioned on the same horizontal plane.
Utilize well lid reinforced structure of dowel bar and existing road surface basis anchor as above, preferably, well lid reinforced structure still includes:
the support rods are connected with the well lid support through binding bars, so that the upper surface of the well lid support and an existing road surface are located on the same horizontal plane.
According to the manhole cover reinforcing structure anchored by using the dowel bars and the existing pavement foundation, preferably, a plurality of insertion holes corresponding to the dowel bars are formed in the outer edge of the manhole cover support, and the insertion holes are uniformly distributed in the circumferential direction of the manhole cover support;
the dowel is n-shaped, and at least one end of the dowel passes through the jack and extends into the manhole cover ring rib.
A well lid reinforcing method utilizing a dowel bar and an existing pavement foundation for anchoring comprises the following steps:
step S1, performing circular cutting on the existing road surface along the outer edge of the well lid support to form a circular cutting groove;
step S2, binding well cover ring ribs matched with the annular cutting grooves, wherein the well cover ring ribs are correspondingly placed in the annular cutting grooves and are positioned below the well cover support;
step S3, arranging a support template at the well mouth of the sewer, wherein the support template supports the well lid support and is used as a template to seal a gap between the well lid support and the well mouth of the sewer;
step S4, inserting a dowel bar through the well lid support and extending into the well lid ring rib to serve as a prefabricated part to connect the well lid support and the well lid ring rib;
and step S5, pouring the annular cutting groove through concrete so that the well cover support, the well cover ring rib and the dowel bar form a whole through concrete pouring.
The method for reinforcing the well lid anchored with the existing pavement foundation by using the dowel bars preferably further comprises the following steps:
and step S6, after concrete pouring is finished, watering, covering and curing are carried out, and after curing is finished, the support cushion template is taken out.
The method for reinforcing the well lid anchored with the existing pavement foundation by using the dowel bars preferably further comprises the following steps:
and step S7, spreading the asphalt above the concrete, wherein the upper surface of the asphalt is at the same level with the existing road surface.
Has the advantages that: the well lid support is supported through concrete pouring, and the concrete has stronger compression resistance, so that the stability of the reinforced well lid support can be effectively improved, the road is smooth and attractive, the smoothness of the existing road surface and the driving comfort are ensured, and the traffic safety and the service level of urban roads are improved; meanwhile, the maintenance rate of quality defects caused by the quality problem of the well cover in the later period is reduced, the maintenance cost in the later period is saved, the influence of the closed period of the road construction on the surrounding social environment is reduced, the influence of maintenance waste on the surrounding environment is reduced, and better economic and social benefits are obtained.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic structural view of installation of a manhole cover support and a manhole cover ring rib provided in an embodiment of the present invention;
fig. 2 is a schematic structural view of the manhole cover reinforcing structure provided in the embodiment of the present invention before pouring;
fig. 3 is a schematic structural view of a pouring state of the manhole cover reinforcing structure provided in the embodiment of the present invention.
Illustration of the drawings: 1. annularly cutting grooves; 2. well cover ring ribs; 3. a well cover support; 4. inserting ribs; 5. a jack; 6. supporting a cushion template; 7. a well cover; 8. existing road surfaces; 9. a sewer wellhead; 10. concrete; 11. spreading and layering asphalt; 12. a support bar; 13. and (5) binding the ribs.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 1-3, a utilize well lid reinforced structure of dowel bar and existing road surface basis anchor sets up in 9 departments of sewer well head, consolidates well lid support 3 to existing road surface 8, and well lid reinforced structure includes:
the well lid support 3 is correspondingly arranged at a sewer wellhead 9 to install a well lid 7;
the annular cutting groove 1 surrounds the well lid support 3;
the well cover ring rib 2 is matched with the annular cutting groove 1, correspondingly placed in the annular cutting groove 1 and positioned below the well cover support 3;
the support template 6 is arranged at the sewer wellhead 9, supports the well lid support 3 and is used as a template for sealing a gap between the well lid support 3 and the sewer wellhead 9;
the dowel bars 4 penetrate through the well lid support 3 and extend into the well lid ring ribs 2 to serve as prefabricated components to connect the well lid support 3 and the well lid ring ribs 2;
and concrete 10, wherein the annular cutting groove 1 is poured through the concrete 10, so that the well lid support 3, the well lid ring rib 2 and the dowel rib 4 form a whole.
Carry out the circular cutting around well lid support 3 on existing road surface 8, form ring grooving 1, set up well lid circle muscle 2 in circular grooving 1, through the support skeleton of well lid circle muscle 2 conduct concrete, utilize dowel bar 4 to connect 3 well lid circle muscle 2 of well lid support, pour through concrete 10 and support well lid support 3 in circular grooving 1, because concrete 10 compressive capacity is stronger, can effectively improve the stability of consolidating back well lid support 3. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In the embodiment, the annular cutting groove 1 is concentric with the sewer manhole cover 7, and the thickness of the annular cutting groove 1 is 25 cm; the ring width of the ring corresponding to the ring cutting groove 1 is 30 cm.
In another embodiment of the present application, the bolster template 6 is a bladder having valves that can be inflated or deflated. Utilize the gasbag to inflate as a bolster template 6 and carry out a bolster of well lid support 3, play the effect that supports well lid support 3 and act as the template, pour and deflate convenient to detach and use to the gasbag after accomplishing. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In this embodiment, the outside of the air bag is provided with a cushion layer corresponding to the well lid support 3 and the sewer well mouth 9. The cushion layer can be a plastic film or a woven bag, can avoid the air bag from being adhered after concrete pouring, and ensures the service life of the air bag so as to be recycled.
In another embodiment of the present application, the manhole cover reinforcing structure further includes:
and the asphalt paving layer 11 is paved above the concrete 10, and the upper surface of the asphalt paving layer and the existing road surface 8 are positioned on the same horizontal plane. The road is smooth and attractive by paving the asphalt, the smoothness and the driving comfort of the existing road surface 8 are ensured, and the traffic safety and the service level of the urban road are improved.
In this embodiment, the difference in height between the upper surface of the concrete 10 and the existing road surface 8 is 5cm, and is used for paving asphalt. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In another embodiment of the present application, the manhole cover fixing structure further includes:
the support rods 12 and at least two support rods 12 are connected with the well lid support 3 through binding ribs 13, so that the upper surface of the well lid support 3 and the existing road surface 8 are located on the same horizontal plane.
At least two bracing pieces 12 levels are placed in existing road surface 8, are equipped with tie-up bar 13 between bracing piece 12 and well lid support 3, make well lid support 3 upper surface and existing road surface 8 be in same horizontal plane through tie-up bar 13 to guarantee to consolidate the planarization on existing road surface 8 afterwards. After the concrete 10 is poured, the binding bar 13 is cut off, and the support rod 12 is taken down. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In another embodiment of the present application, the outer edge of the manhole cover support 3 has a plurality of insertion holes 5 corresponding to the insertion ribs 4, and the insertion holes 5 are circumferentially and uniformly distributed with respect to the manhole cover support 3;
the dowel bars 4 are n-shaped, and at least one end of the dowel bars 4 penetrates through the insertion holes 5 and extends into the manhole cover ring rib 2.
With the preformed hole on current well lid support 3 side edge as jack 5, insert this jack 5 with 4 one ends of dowel steel, the other end inserts well lid circle muscle 2 in the outside of well lid support 3, utilizes its n shape structure to carry out vertical spacing to well lid support 3, guarantees that well lid support 3, well lid circle muscle 2 and dowel steel 4 after concreting 10 form wholly. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In the embodiment, the manhole cover ring rib 2 is made by rolling a steel bar with the diameter phi 16, and the inserting rib 4 is made by bending a steel bar with the diameter phi 12. The well cover ring rib 2 is formed by arranging two layers of ribs from top to bottom, each layer of rib comprises two rings of ribs coaxially arranged, stirrups are arranged along the radial direction to fix the rings of ribs, and the stirrups are uniformly distributed in a plurality of circumferential directions. A method for reinforcing a well lid 7 anchored by using a dowel 4 and an existing pavement 8 foundation comprises the following steps:
step S1, performing circular cutting on the existing road surface 8 along the outer edge of the manhole cover support 3 to form a circular cutting groove 1;
step S2, binding a well cover ring rib 2 matched with the annular cutting groove 1, and correspondingly placing the well cover ring rib 2 in the annular cutting groove 1 and below the well cover support 3;
step S3, arranging a support template 6 at the sewer wellhead 9;
step S4, the dowel bar 4 penetrates through the well lid support 3 and extends into the well lid ring bar 2;
in step S5, the ring-cut groove 1 is poured with the concrete 10.
Carry out the circular cutting around well lid support 3 on existing road surface 8, form ring grooving 1, set up well lid circle muscle 2 in circular grooving 1, through the support skeleton of well lid circle muscle 2 conduct concrete, utilize dowel 4 to connect well lid support 3 and well lid circle muscle 2, pour through concrete 10 at ring grooving 1 and support well lid support 3, because concrete 10 compressive capacity is stronger, can effectively improve the stability of consolidating back well lid support 3. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In this embodiment, the hand-push type well lid 7 circle cutting machine is used for cutting by taking the center of the well lid 7 as the circle center and taking the radius of the well lid 7 plus 30cm as the cutting radius, wherein the cutting thickness is 25cm, and manual cleaning is performed.
In another embodiment of the present application, in step S2, at least two support rods 12 are connected to the manhole cover support 3 through binding bars 13, so that the upper surface of the manhole cover support 3 is at the same level with the existing road surface 8. At least two bracing pieces 12 levels are placed in existing road surface 8, are equipped with tie-up bar 13 between bracing piece 12 and well lid support 3, make well lid support 3 upper surface and existing road surface 8 be in same horizontal plane through tie-up bar 13 to guarantee to consolidate the planarization on existing road surface 8 afterwards. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In another embodiment of the present application, the bolster template 6 is a bladder having valves that can be inflated or deflated. Utilize the gasbag to inflate as a bolster template 6 and carry out a bolster of well lid support 3, play the effect that supports well lid support 3 and act as the template, pour the completion back, deflate convenient to detach and use the gasbag. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In this embodiment, the outside of the air bag is provided with a cushion layer corresponding to the well lid support 3 and the sewer well mouth 9. The cushion layer can be a plastic film or a woven bag, can avoid the air bag from being adhered after concrete pouring, and ensures the service life of the air bag so as to be recycled.
In another embodiment of the present application, the method further comprises:
and step S6, after the concrete 10 is poured, watering, covering and curing are carried out, and after the curing is finished, the support cushion template 6 is taken out. Specifically, after concrete 10 is poured, watering, covering and maintaining are carried out for at least 7 days, and air in the air bag is discharged after maintaining is finished and is taken out for circulation. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In another embodiment of the present application, the method further comprises:
step S7, paving the asphalt above the concrete 10, with the upper surface of the asphalt being at the same level as the existing road surface 8.
After the manhole cover ring rib 2 is installed, concrete 10 is poured, C30 concrete 10 is poured, an inserted vibrating rod is used for vibrating, and the concrete 10 is poured to the ground by 5 cm. Filling fine-grain asphalt with a 5cm surface layer, and compacting by using a road roller to ensure that the upper surface and the existing road surface 8 are in the same horizontal plane. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
To sum up, in this application, for guaranteeing the reinforced quality of well lid 7, utilize the gasbag to prop up the pad with well lid support 3, play the support and act as the effect of template, pour concrete 10 to circular cutting groove 1 again, deflate at last and take out the gasbag to make well lid support 3 prop up the pad material and become the great concrete 10 material of intensity by original red brick, in order to reach the purpose that increases compressive strength. The well lid ring ribs 2 and the dowel bars 4 are manufactured to enable the well lid support 3, the well lid ring ribs 2 and the dowel bars 4 to form a whole, when concrete 10 is poured, the well lid ring ribs 2 are tightly combined with the surrounding concrete 10, and when a vehicle runs above the vehicle, opposite direction pulling force is provided for the well lid 7. Thereby guarantee well lid 7 and consolidate the quality, reduced construction maintenance and rework. The extra cost caused by the maintenance of the well cover 7 is greatly reduced, and the requirement on the road quality is met.
The above description is only exemplary of the invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the invention is intended to be covered by the appended claims.
Claims (8)
1. The utility model provides an utilize well lid reinforced structure of dowel bar and existing road surface basis anchor sets up in sewer well head department, consolidates the well lid support of existing road surface, its characterized in that, well lid reinforced structure includes:
the manhole cover support is correspondingly arranged at the manhole opening of the sewer so as to install a manhole cover;
the annular cutting groove surrounds the well lid support;
the well cover ring rib is matched with the annular cutting groove, is correspondingly placed in the annular cutting groove and is positioned below the well cover support;
the support cushion template is arranged at the well mouth of the sewer, supports the well lid support and is used as a template for sealing a gap between the well lid support and the well mouth of the sewer;
the dowel bars penetrate through the well lid support and extend into the well lid ring ribs to serve as prefabricated components to connect the well lid support and the well lid ring ribs;
and concrete is poured in the annular cutting groove, so that the well cover support, the well cover ring rib and the dowel bar form a whole.
2. The manhole cover reinforcing structure anchored with the existing road foundation by using the dowel bars of claim 1, wherein the supporting template is an air bag, and the air bag is provided with a valve capable of being inflated or deflated.
3. The manhole cover reinforcing structure anchored with an existing road foundation by using the dowel bars of claim 1, further comprising:
and the asphalt spreading layer is spread above the concrete, and the upper surface of the asphalt spreading layer and the existing road surface are positioned on the same horizontal plane.
4. The manhole cover reinforcing structure anchored with an existing road foundation by using the dowel bars of claim 1, further comprising:
the support rods are connected with the well lid support through binding bars, so that the upper surface of the well lid support and an existing road surface are located on the same horizontal plane.
5. The manhole cover reinforcing structure anchored with the existing road foundation by using the dowel bars of claim 1,
the outer edge of the well lid support is provided with a plurality of insertion holes corresponding to the dowel bars, and the insertion holes are uniformly distributed in the circumferential direction of the well lid support;
the dowel is n-shaped, and at least one end of the dowel passes through the jack and extends into the manhole cover ring rib.
6. A well lid reinforcing method utilizing a dowel bar and an existing pavement foundation for anchoring is characterized by comprising the following steps:
step S1, performing circular cutting on the existing road surface along the outer edge of the well lid support to form a circular cutting groove;
step S2, binding well cover ring ribs matched with the annular cutting grooves, wherein the well cover ring ribs are correspondingly placed in the annular cutting grooves and are positioned below the well cover support;
step S3, arranging a support pad template at the well mouth of the sewer;
step S4, inserting the dowel bars through the manhole cover support and extending into the manhole cover ring ribs;
step S5, the ring-cut groove is cast with concrete.
7. The method of reinforcing a manhole cover anchored with an existing roadway foundation using dowel bars of claim 6, further comprising:
and step S6, after concrete pouring is finished, watering, covering and curing are carried out, and after curing is finished, the support cushion template is taken out.
8. The method of claim 6, wherein the reinforcing means for the manhole cover anchored by the dowel bars and the existing road base,
the method further comprises the following steps:
and step S7, spreading the asphalt above the concrete, wherein the upper surface of the asphalt is at the same level with the existing road surface.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110197248.1A CN112575819A (en) | 2021-02-22 | 2021-02-22 | Manhole cover reinforcing structure and method anchored by using dowel bars and existing pavement foundation |
| PCT/CN2021/081906 WO2021213099A1 (en) | 2021-02-22 | 2021-03-19 | Structure and method for reinforcing manhole cover anchored with existing road surface foundation by means of dowel bars |
| LU501207A LU501207B1 (en) | 2021-02-22 | 2022-01-05 | Structure and method for reinforcing manhole cover anchored with existing road surface foundation by means of dowel bars |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110197248.1A CN112575819A (en) | 2021-02-22 | 2021-02-22 | Manhole cover reinforcing structure and method anchored by using dowel bars and existing pavement foundation |
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|---|---|
| CN112575819A true CN112575819A (en) | 2021-03-30 |
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| CN202110197248.1A Pending CN112575819A (en) | 2021-02-22 | 2021-02-22 | Manhole cover reinforcing structure and method anchored by using dowel bars and existing pavement foundation |
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| Country | Link |
|---|---|
| CN (1) | CN112575819A (en) |
| LU (1) | LU501207B1 (en) |
| WO (1) | WO2021213099A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114703901B (en) * | 2022-02-16 | 2023-08-22 | 福建建工基础设施建设集团有限公司 | Construction method of rain sewage well lid |
| CN116145731A (en) * | 2022-12-30 | 2023-05-23 | 中铁一局集团有限公司 | Inverted anti-sedimentation manhole cover construction method |
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| CN110700581A (en) * | 2019-10-17 | 2020-01-17 | 广西建工集团第五建筑工程有限责任公司 | Reinforced concrete thin-wall cylindrical well template system and method for pouring thin-wall cylindrical well by using same |
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2021
- 2021-02-22 CN CN202110197248.1A patent/CN112575819A/en active Pending
- 2021-03-19 WO PCT/CN2021/081906 patent/WO2021213099A1/en active Application Filing
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2022
- 2022-01-05 LU LU501207A patent/LU501207B1/en active IP Right Grant
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| DE10158389C2 (en) * | 2001-11-28 | 2003-12-11 | Bartolo Vienna | manhole cover |
| WO2011156796A2 (en) * | 2010-06-10 | 2011-12-15 | Polylast Systems,Llc | Manhole, roadway and walkway repair |
| CN106906847A (en) * | 2017-04-07 | 2017-06-30 | 北京特希达交通勘察设计院有限公司 | A kind of urban road inspection shaft |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2021213099A1 (en) | 2021-10-28 |
| LU501207B1 (en) | 2022-07-05 |
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