CN104895116B - A kind of dropproof well lid mounting structure of inspection shaft - Google Patents
A kind of dropproof well lid mounting structure of inspection shaft Download PDFInfo
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- CN104895116B CN104895116B CN201510378589.3A CN201510378589A CN104895116B CN 104895116 B CN104895116 B CN 104895116B CN 201510378589 A CN201510378589 A CN 201510378589A CN 104895116 B CN104895116 B CN 104895116B
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Abstract
The invention provides the dropproof well lid mounting structure of a kind of inspection shaft, belong to technical field of fixed buildings.It solve the dropproof well in the dropproof well lid mounting structure of existing inspection shaft to be easily flushed away when waterlogging and the problem that lost efficacy.The dropproof well lid mounting structure of this inspection shaft, including tubular cover seat of manhole with disc-shaped anti-fall well lid, cover seat of manhole can be socketed on the pit shaft of inspection shaft, cover seat of manhole inwall has prominent limiting block edge, the anti-well lid that falls is placed in cover seat of manhole and prevents that the bottom falling well lid is resisted against limiting block along upper, cover seat of manhole upper end has at least two and protrudes inwardly from the limit convex edge of cover seat of manhole, anti-fall well lid has step down one to one along position and shape recess with limit convex, and limit convex is higher than the anti-upper surface falling well lid or concordant with preventing the upper surface falling well lid along lower surface.The present invention is prevented from after well lid is lost to cause danger under the careless back drop of pedestrian, improve the safety of inspection shaft.
Description
Technical field
The invention belongs to technical field of fixed buildings, relate to the dropproof well lid mounting structure of a kind of inspection shaft, particularly a kind of inspection shaft.
Background technology
Inspection shaft is for the maintenance such as the power supply of Urban Underground infrastructure, feedwater, draining, blowdown, communication, cable television, gas pipe, public lighting circuit and easy for installation and arrange.Laying due to pipeline and need, inspection shaft can be positioned on the road surface of size road, and inspection shaft well head goes out to arrange well lid, and inspection shaft is closed by well lid, it is prevented that pedestrian is strayed into or in unexpected back drop.When needing the pipeline in inspection shaft or equipment are overhauled, opening well lid, inspection personnel is gone into the well and overhauls or overhauled by specific purpose tool.
Due to well lid damage, stolen or be flushed away when waterlogging, cause that well lid loses the effect of protection pedestrian.In order to improve the safety of inspection shaft, by reinforcing well lid, improving the material reduction well lid damage of well lid, probability that is stolen or that be flushed away when waterlogging in industry, but effect is not notable.Therefore, occur in that and anti-fall well lid and prevent personnel from falling into the solution in well by arranging.
Such as, Chinese patent [application number 201320680260.9；Authorization Notice No. CN203531120U] disclosed in a kind of dropproof catch-basin, by well bore, recessed edge, internal projecting ring, main shaft lid, auxiliary shaft lid form, and recessed edge is positioned at well head place, and internal projecting ring is positioned on well bore, and main shaft lid is positioned over recessed along upper, and auxiliary shaft lid is positioned on internal projecting ring.This dropproof catch-basin has problems in that, auxiliary shaft lid is positioned over internal projecting ring, and auxiliary shaft lid is easily flushed away when waterlogging and lost efficacy.
Summary of the invention
It is an object of the invention to there are the problems referred to above for existing technology, it is proposed that the dropproof well lid mounting structure of a kind of inspection shaft, present invention solves the technical problem that it is how to avoid well lid to lose to cause the accident in the careless back drop of pedestrian to occur.
The purpose of the present invention can be realized by following technical proposal: the dropproof well lid mounting structure of a kind of inspection shaft, it is characterized in that, this dropproof well lid mounting structure includes tubular cover seat of manhole and disc-shaped anti-falls well lid, described cover seat of manhole can be socketed on the pit shaft of inspection shaft, described cover seat of manhole inwall has prominent limiting block edge, the described anti-well lid that falls is placed in cover seat of manhole and prevents that the bottom falling well lid is resisted against above-mentioned limiting block along upper, described cover seat of manhole upper end has at least two and protrudes inwardly from the limit convex edge of cover seat of manhole, described anti-fall well lid has step down one to one along position and shape recess with above-mentioned limit convex, and described limit convex along lower surface higher than the described anti-upper surface falling well lid or concordant with the anti-upper surface falling well lid.
The dropproof well lid mounting structure of this inspection shaft will prevent that falling well lid is installed in inspection shaft by cover seat of manhole, during installation, first cover seat of manhole is socketed on the pit shaft of inspection shaft, again by the anti-limit convex edge stepped down on recess alignment cover seat of manhole falling well lid, and the anti-well lid that falls is loaded in cover seat of manhole, the anti-bottom falling well lid is made to be resisted against limiting block along upper, then circumferentially rotate and prevent falling well lid, the anti-edge falling well lid is made to snap in limit convex edge, thus anti-the carrying out falling well lid is spacing, it is prevented that the anti-well lid that falls departs from cover seat of manhole.The dropproof well lid mounting structure of this inspection shaft is prevented from after well lid is lost to cause danger under the careless back drop of pedestrian, install and in maintenance process at inspection shaft, only need to circumferentially rotate and prevent falling well lid, can make to prevent that falling well lid separates with cover seat of manhole, the anti-easy accessibility falling well lid.Further, such structure can be applicable to existing inspection shaft, and versatility is good, it is possible to for the transformation to existing inspection shaft equipment, makes the safety of inspection shaft be improved.
In the dropproof well lid mounting structure of above-mentioned inspection shaft, described anti-falling has several cross bars and several vertical poles in well lid, and described cross bar and vertical pole are staggered to form several and are latticed and run through the anti-through hole falling well lid.When the excessive formation waterlogging of the pipeline flow under inspection shaft, the sewage poured in down a chimney can pass through through through hole and overflow, and decreases hydraulic pressure to the anti-active force falling well lid, it is to avoid prevents that falling well lid is flushed away.
In the dropproof well lid mounting structure of above-mentioned inspection shaft, described cross bar upper end has the convex edge one extended to both sides, and described vertical pole upper end has the convex edge two extended to both sides.By arranging convex edge one and convex edge two, one is the intensity that improve cross bar and vertical pole；Two are so that the position contact surface of the anti-upper end falling well lid and human contact is bigger, it is to avoid clash into, with the anti-well lid that falls, the scratch causing health when personnel drop；Three is that the position of convex edge one and convex edge two makes anti-to fall well lid demoulding in forming process and be easier to.
In the dropproof well lid mounting structure of above-mentioned inspection shaft, described anti-falling has along preventing falling the reinforced wall that well lid medial wall is circumferentially disposed in well lid, described reinforced wall and anti-falling have gap between well lid medial wall.Make to prevent falling well lid lighter in weight while raising prevents falling well lid intensity by arranging reinforced wall.
As preferably, in the dropproof well lid mounting structure of above-mentioned inspection shaft, described anti-fall well lid have several with limiting block along position just to hole, location, described anti-fall well lid and positioned by screw.When preventing that falling well lid installs, first anti-will fall well lid and be placed in restraining position, then be screwed into screw in hole, location, anti-will fall well lid by screw and be fixed on cover seat of manhole.
As it is preferred that, in the dropproof well lid mounting structure of above-mentioned inspection shaft, described reinforced wall and anti-falling have several reinforcing props between well lid medial wall, above-mentioned reinforcing prop is run through in hole, described location.Anti-fall well lid fixing time, screw, through the hole, location in reinforcing prop, is played guiding and positioning action by positioning the inwall in hole by screw so that the anti-location falling well lid is more reliable.
In the dropproof well lid mounting structure of above-mentioned inspection shaft, described limit convex is along exceeding the upper surface of described cover seat of manhole, and the described anti-upper surface falling well lid is concordant with the upper surface of cover seat of manhole.Make dropproof well lid mounting structure more compact.
In the dropproof well lid mounting structure of above-mentioned inspection shaft, described limiting block edge and limit convex are along around cover seat of manhole inwall one week, and each described limit convex is connected along corresponding position along one end with limiting block, the other end is opening, described limit convex edge has against muscle with limiting block along the one end being connected, and described against muscle along the parallel axial distribution with cover seat of manhole, described one end against muscle is connected with limit convex edge, the other end is connected with limiting block edge, and identical with the width on limit convex edge against the width of muscle.During installation, anti-falling abuts against on muscle after well lid circumferentially rotates, to preventing that falling circumferentially rotating of well lid plays position-limiting action.
In the dropproof well lid mounting structure of above-mentioned inspection shaft, described cover seat of manhole is arranged with back-up ring, described back-up ring includes circle body and lower circle body, described lower circle body has the connecting cylinder one matched with cover seat of manhole and the overlap joint mother's mouth for being connected with lower circle body, described upper circle body has and overlap joint female mouth coordinates overlaps male mouth and the connecting cylinder two for installation check well well lid, described prevents that falling well lid is positioned at the position corresponding with connecting cylinder one.Back-up ring is split-type structural, cover seat of manhole, anti-fall well lid, upper circle body and lower circle body and can individually transport, and easy to assembly, after installing, anti-fall well lid and is positioned at the position corresponding with connecting cylinder one, and the personnel being more beneficial under back drop save oneself or accept rescue.
In the dropproof well lid mounting structure of above-mentioned inspection shaft, the sealing ring corresponding with connecting cylinder one shape is set between described lower circle body and cover seat of manhole.Improve the sealing property of back-up ring and cover seat of manhole junction.
Compared with prior art, the advantage of the dropproof well lid mounting structure of this inspection shaft is in that:
1, the dropproof well lid mounting structure of this inspection shaft will prevent that falling well lid is installed on the pit shaft of inspection shaft by cover seat of manhole, it is possible to causes danger under the careless back drop of pedestrian after preventing well lid from losing, improves the safety of inspection shaft.
2, the cover seat of manhole of the dropproof well lid mounting structure of this inspection shaft and anti-fall well lid by limiting block edge and limit convex along spacing, install and in maintenance process at inspection shaft, only need to circumferentially rotate and prevent falling well lid, can make to prevent that falling well lid separates with cover seat of manhole, the anti-easy accessibility falling well lid.
3, the dropproof well lid mounting structure of this inspection shaft is suitable for the transformation to existing inspection shaft equipment, and versatility is better.
Accompanying drawing explanation
Fig. 1 is the scheme of installation of the dropproof well lid mounting structure of this inspection shaft.
Fig. 2 is the installation top view of the dropproof well lid mounting structure of this inspection shaft.
Fig. 3 is A-A place sectional structure schematic diagram in Fig. 2.
Fig. 4 is the partial enlarged drawing at B place in Fig. 3.
Fig. 5 is the partial enlarged drawing at C place in Fig. 3.
Fig. 6 be this inspection shaft dropproof well lid mounting structure in cover seat of manhole and the anti-mounting structure schematic diagram falling well lid.
Fig. 7 be this inspection shaft dropproof well lid mounting structure in mounting structure schematic diagram under cover seat of manhole and the anti-spacing state falling well lid.
Fig. 8 be this inspection shaft dropproof well lid mounting structure in the anti-structural representation falling well lid.
Fig. 9 be this inspection shaft dropproof well lid mounting structure in the structural representation of cover seat of manhole.
In figure, 1, pit shaft；2, cover seat of manhole；21, limiting block edge；22, limit convex edge；23, opening；24, against muscle；3, prevent falling well lid；31, step down recess；32, cross bar；321, convex edge one；33, vertical pole；331, convex edge two；34, through hole；35, reinforced wall；36；Hole, location；37, reinforcing prop；4, back-up ring；41, upper circle body；411, connecting cylinder two；412, the public mouth of overlap joint；42, lower circle body；421, connecting cylinder one；422, the female mouth of overlap joint；5, sealing ring.
Detailed description of the invention
The following is specific embodiments of the invention and in conjunction with accompanying drawing, technical scheme is further described, but the present invention is not limited to these embodiments.
The dropproof well lid mounting structure of this inspection shaft include cover seat of manhole 2, limiting block along 21, limit convex along 22, anti-fall well lid 3 and recess 31 of stepping down.
Specifically, as it is shown in figure 1, cover seat of manhole 2 is socketed on the pit shaft 1 of inspection shaft, the anti-well lid 3 that falls is arranged in cover seat of manhole 2 and positions with cover seat of manhole 2.As shown in Figure 8, the anti-well lid 3 that falls is disc-shaped, and anti-falling has several cross bar 32 and several vertical poles 33 in well lid 3, and cross bar 32 and vertical pole 33 are staggered to form several and are latticed and run through the anti-through hole 34 falling well lid 3.Cross bar 32 upper end has the convex edge 1 extended to both sides, and vertical pole 33 upper end has the convex edge 2 331 extended to both sides.Anti-falling has along preventing falling the reinforced wall 35 that well lid 3 medial wall is circumferentially disposed in well lid 3, reinforced wall 35 and anti-falling have gap between well lid 3 medial wall, by arranging reinforced wall 35.
Being respectively provided with convex edge 1 and convex edge 2 331 on the anti-cross bar 32 falling well lid 3 and vertical pole 33, anti-falling also has reinforced wall 35 on well lid 3, improve cross bar 32 and the intensity of vertical pole 33 so that prevent that falling well lid 3 can bear bigger gravity and instantaneous impact.Further, convex edge 1 and convex edge 2 331 increase and prevent falling the upper end of well lid 3 and the position contact surface of human contact, it is to avoid clash into, with the anti-well lid 3 that falls, the scratch causing health when personnel drop, ensured the personal safety of unexpected personnel to fall into well.It addition, this spline structure anti-falls well lid 3 demoulding in forming process and be easier to, the anti-deadweight falling well lid 3 is less, reduces production cost.
As it is shown in figure 9, cover seat of manhole 2 is in a cylindrical shape, cover seat of manhole 2 inwall has prominent limiting block along 21, and in the present embodiment, cover seat of manhole 2 upper end has two limit convexes protruding inwardly from cover seat of manhole 2 along 22, and limit convex is along 22 upper surfaces exceeding cover seat of manhole 2.In actual production and manufacture process, limit convex can also be two or more along 22 quantity.
As shown in Figure 2, Figure 3 and Figure 4, when preventing that falling well lid 3 is installed in cover seat of manhole 2, the anti-bottom falling well lid 3 is resisted against limiting block along 21, and limit convex is higher than the anti-upper surface falling well lid 3 or concordant with preventing the upper surface falling well lid 3 along 22 lower surfaces.As shown in Figure 6 and Figure 7, anti-falling has limit convex and steps down one to one along 22 positions and shape recess 31 on well lid 3.Step down recess 31 and corresponding limit convex along 22 positions just pair time, anti-will fall well lid 3 and load in cover seat of manhole 2, and make the anti-upper surface falling well lid 3 concordant with the upper surface of cover seat of manhole 2, circumferentially rotate the anti-well lid 3 that falls and make to prevent that falling well lid 3 snaps in limit convex along 22.Prevent that falling well lid 3 moves upward by limit convex along 22 restrictions, it is to avoid prevent that falling well lid 3 departs from cover seat of manhole 2.
As it is shown in figure 9, in the present embodiment, limiting block is separated into two section by two limit convexes along 22 along 21, two sections of limiting blocks are spaced apart along 22 along 21 and two limit convexes.Limiting block is end to end around cover seat of manhole 2 inwall one week along 22 projections at grade along 21 and limit convex, in molding process, it is to avoid limiting block blocks mould along 21 and limit convex along 22 location overlaps and causes demoulding difficulty.Each limit convex is connected along 21 along 22 one end with corresponding limiting block, limit convex has against muscle 24 with limiting block along 21 one end being connected along 22, against muscle 24 along the axial distribution being parallel to cover seat of manhole 2, upper end against muscle 24 is connected along 22 with limit convex, lower end is connected along 21 with limiting block, and the width against width and the limit convex of muscle 24 along 22 is identical.During installation, anti-falling abuts against on muscle 24 after well lid 3 circumferentially rotates, to preventing that falling circumferentially rotating of well lid 3 plays position-limiting action.Limit convex is opening 23 along the other end of 22, and the opening 23 that two limit convexes are along 22 is with anti-to fall the direction that well lid 3 circumferentially rotates corresponding.
Preferably, as shown in Figure 6 and Figure 7, anti-fall well lid 3 have several with limiting block along 21 positions just to hole, location 36, anti-fall well lid 3 and positioned by screw.When preventing that falling well lid 3 installs, first anti-will fall well lid 3 and be placed in restraining position, then be screwed into screw in hole 36, location, anti-will fall well lid 3 by screw and be fixed on cover seat of manhole 2.As it is preferred that, reinforced wall 35 and anti-falling have several reinforcing props 37 between well lid 3 medial wall, reinforcing prop 37 is run through in hole 36, location.The anti-well lid 3 that falls is when fixing, and screw, through the hole, location 36 in reinforcing prop 37, is played guiding and positioning action by positioning the inwall in hole 36 by screw so that the anti-location falling well lid 3 is more reliable.
As shown in Fig. 3, Fig. 4 and Fig. 5, cover seat of manhole 2 is arranged with back-up ring 4, back-up ring 4 includes circle body 41 and lower circle body 42, lower circle body 42 has the connecting cylinder 1 matched with cover seat of manhole 2 and the overlap joint mother's mouth 422 for being connected with lower circle body 42, upper circle body 41 has the male mouth 412 of overlap joint and the connecting cylinder 2 411 for installation check well well lid that coordinate with the female mouth 422 of overlap joint, prevents that falling well lid 3 is positioned at the position corresponding with connecting cylinder 1.The sealing ring 5 corresponding with connecting cylinder 1 shape is set between lower circle body 42 and cover seat of manhole 2, improves the sealing property of back-up ring 4 and cover seat of manhole 2 junction.Back-up ring 4 is split-type structural, cover seat of manhole 2, anti-fall well lid 3, upper circle body 41, lower circle body 42 and sealing ring 5 and can individually transport, and easy to assembly, after installing, preventing that falling well lid 3 is positioned at the position corresponding with connecting cylinder 1, the personnel being more beneficial under back drop save oneself or receive rescue.
The mounting means of the dropproof well lid mounting structure of this inspection shaft is: be first socketed on the pit shaft 1 of inspection shaft by cover seat of manhole 2, the limit convex being directed on cover seat of manhole 2 by the anti-recess 31 of stepping down falling well lid 3 again is along 22, and will prevent that falling well lid 3 loads in cover seat of manhole 2, as shown in Figure 6, the anti-bottom falling well lid 3 is made to be resisted against limiting block along 21, then circumferentially rotate and prevent falling well lid 3, the anti-edge falling well lid 3 is made to snap in limit convex along 22, as shown in Figure 7, thus anti-the carrying out falling well lid 3 is spacing, it is prevented that anti-fall well lid 3 and depart from cover seat of manhole 2.The dropproof well lid mounting structure of this inspection shaft is prevented from after well lid is lost to cause danger under the careless back drop of pedestrian.When under inspection shaft, pipeline flow is excessive, the sewage poured in down a chimney can pass through through through hole 34 and overflow, and decreases hydraulic pressure to the anti-active force falling well lid 3, it is to avoid prevents that falling well lid 3 is flushed away.
Specific embodiment described herein is only to present invention spirit explanation for example.Described specific embodiment can be made various amendment or supplements or adopt similar mode to substitute by those skilled in the art, but without departing from the spirit of the present invention or surmount the scope that appended claims is defined.
Although more employ herein pit shaft 1, cover seat of manhole 2, limiting block along 21, limit convex along 22, opening 23, against muscle 24, anti-fall well lid 3, recess 31 of stepping down, cross bar 32, convex edge 1, vertical pole 33, convex edge 2 331, through hole 34, reinforced wall 35, hole 36, location；Reinforcing prop 37, back-up ring 4, upper circle body 41, connecting cylinder 2 411, the male mouth 412 of overlap joint, lower circle body 42, connecting cylinder 1, the female term such as mouth 422, sealing ring 5 of overlap joint, but it is not precluded from using the probability of other term.These terms are used to be only used to describe and explain more easily the essence of the present invention；It is all contrary with spirit of the present invention for being construed as any additional restriction.
Claims (10)
- null1. the dropproof well lid mounting structure of an inspection shaft，It is characterized in that，This dropproof well lid mounting structure includes tubular cover seat of manhole (2) and disc-shaped anti-falls well lid (3)，Described cover seat of manhole (2) can be socketed on the pit shaft (1) of inspection shaft，Described cover seat of manhole (2) inwall has prominent limiting block edge (21)，The described anti-well lid (3) that falls is placed in cover seat of manhole (2) and prevents that the bottom falling well lid (3) is resisted against on above-mentioned limiting block edge (21)，Described cover seat of manhole (2) upper end has at least two and protrudes inwardly from limit convex edge (22) of cover seat of manhole (2)，Described anti-fall well lid (3) has step down one to one along (22) position and shape recess (31) with above-mentioned limit convex，And (22) lower surface, described limit convex edge is higher than the described anti-upper surface falling well lid (3) or concordant with preventing the upper surface falling well lid (3)，Described limiting block along (21) and limit convex edge (22) around cover seat of manhole (2) inwall one week，And (22) one end, each described limit convex edge is connected along (21) corresponding position with limiting block，The other end is opening (23)，One end that described limit convex is connected along (21) along (22) with limiting block has against muscle (24)，Described against muscle (24) along parallel and cover seat of manhole (2) axial distribution，Described one end against muscle (24) is connected along (22) with limit convex，The other end is connected along (21) with limiting block.
- 2. the dropproof well lid mounting structure of inspection shaft according to claim 1, it is characterized in that, described anti-falling has several cross bars (32) and several vertical poles (33), described cross bar (32) and vertical pole (33) and is staggered to form several and is latticed and runs through the through hole (34) preventing falling well lid (3) in well lid (3).
- 3. the dropproof well lid mounting structure of inspection shaft according to claim 2, it is characterized in that, described cross bar (32) upper end has the convex edge one (321) extended to both sides, and described vertical pole (33) upper end has the convex edge two (331) extended to both sides.
- 4. the dropproof well lid mounting structure of the inspection shaft according to claim 1 or 2 or 3, it is characterized in that, described anti-falling has along preventing falling the reinforced wall (35) that well lid (3) medial wall is circumferentially disposed in well lid (3), described reinforced wall (35) and anti-falling have gap between well lid (3) medial wall.
- 5. the dropproof well lid mounting structure of inspection shaft according to claim 4, it is characterized in that, described anti-fall well lid (3) have several with limiting block along (21) position just to hole, location (36), described anti-fall well lid (3) and positioned by screw.
- 6. the dropproof well lid mounting structure of inspection shaft according to claim 5, it is characterized in that, described reinforced wall (35) and anti-falling have several reinforcing props (37) between well lid (3) medial wall, above-mentioned reinforcing prop (37) is run through in hole, described location (36).
- 7. the dropproof well lid mounting structure of the inspection shaft according to claim 1 or 2 or 3, it is characterized in that, described limit convex exceeds the upper surface of described cover seat of manhole (2) along (22), and the described anti-upper surface falling well lid (3) is concordant with the upper surface of cover seat of manhole (2).
- 8. the dropproof well lid mounting structure of the inspection shaft according to claim 1 or 2 or 3, it is characterised in that the described width against muscle (24) is identical along the width of (22) with limit convex.
- 9. the dropproof well lid mounting structure of the inspection shaft according to claim 1 or 2 or 3, it is characterized in that, described cover seat of manhole (2) is arranged with back-up ring (4), described back-up ring (4) includes circle body (41) and lower circle body (42), described lower circle body (42) has the connecting cylinder one (421) matched with cover seat of manhole (2) and overlap joint mother's mouth (422) for being connected with lower circle body (42), described upper circle body (41) has the male mouth of the overlap joint (412) coordinated with the female mouth (422) of overlap joint and the connecting cylinder two (411) for installation check well well lid, described anti-fall well lid (3) and be positioned at the position corresponding with connecting cylinder one (421).
- 10. the dropproof well lid mounting structure of inspection shaft according to claim 9, it is characterized in that, the sealing ring (5) corresponding with connecting cylinder one (421) shape is set between described lower circle body (42) and cover seat of manhole (2).
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| CN201510378589.3A CN104895116B (en) | 2015-06-30 | 2015-06-30 | A kind of dropproof well lid mounting structure of inspection shaft |
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| CN201510378589.3A CN104895116B (en) | 2015-06-30 | 2015-06-30 | A kind of dropproof well lid mounting structure of inspection shaft |
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| CN104895116B true CN104895116B (en) | 2016-07-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2670994B2 (en) * | 1995-11-15 | 1997-10-29 | 三山工業株式会社 | Manhole cover receiving frame with inner cover |
| CN2665218Y (en) * | 2003-12-18 | 2004-12-22 | 袁如顺 | Catch pit cover made by composite materials |
| CN2903186Y (en) * | 2005-07-19 | 2007-05-23 | 和特股份有限公司 | Antitheft tripping proof natural controlling manhole cover seat apparatus |
| CN102322076B (en) * | 2011-06-17 | 2015-03-11 | 浙江天井塑业有限公司 | Check ring combination for road manhole and steel support ring for installing check ring combination |
| CN203361203U (en) * | 2013-06-26 | 2013-12-25 | 徐水县华光市政建材有限公司 | Concrete well lid support, inspection well inner well lid and inspection well concrete well lid assembly |
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