CN113585696A - Movable scaffold device for subway tunnel high-altitude operation - Google Patents
Movable scaffold device for subway tunnel high-altitude operation Download PDFInfo
- Publication number
- CN113585696A CN113585696A CN202110991893.0A CN202110991893A CN113585696A CN 113585696 A CN113585696 A CN 113585696A CN 202110991893 A CN202110991893 A CN 202110991893A CN 113585696 A CN113585696 A CN 113585696A
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- steel pipe
- fixedly connected
- subway tunnel
- construction
- scaffold device
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 58
- 239000010959 steel Substances 0.000 claims abstract description 58
- 238000010276 construction Methods 0.000 claims abstract description 37
- 238000009435 building construction Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000009193 crawling Effects 0.000 claims description 2
- 125000003003 spiro group Chemical group 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/24—Scaffolds primarily resting on the ground comprising essentially special base constructions; comprising essentially special ground-engaging parts, e.g. inclined struts, wheels
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/02—Scaffold feet, e.g. with arrangements for adjustment
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/10—Steps or ladders specially adapted for scaffolds
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/24—Scaffolds primarily resting on the ground comprising essentially special base constructions; comprising essentially special ground-engaging parts, e.g. inclined struts, wheels
- E04G2001/242—Scaffolds movable on wheels or tracks
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Ladders (AREA)
Abstract
A movable scaffold device for high-altitude operation of a subway tunnel relates to the technical field of tunnel construction engineering, and comprises 2 side brackets, wherein the 2 side brackets are connected through a cross brace; the top of 2 collateral branch framves is equipped with additional support, and additional support also is connected through the bridging, is equipped with horizontal steel pipe on collateral branch frame and additional support, is connected with link plate mechanism between the horizontal steel pipe, and link plate mechanism accessible high mode of making up constitutes construction platform or stair structure. The large-scale rail-mounted elevator car is of an assembled structure, is convenient to disassemble and transport, and effectively solves the problem that the large-scale rail-mounted elevator car cannot enter the field; the tunnel is simple and firm in structure, adjustable in angle, convenient to move in the tunnel and convenient to use, and the walking wheels and the universal wheels are arranged; the invention can build construction platforms with various heights according to construction requirements, fully meets the construction requirements, can build a stair structure according to the requirements, and is convenient for personnel to walk up and down and transport appliance materials.
Description
Technical Field
The invention relates to the technical field of tunnel construction engineering, in particular to a movable scaffold device for high-altitude operation of a subway tunnel.
Background
The single-hole double-line tunnel is adopted more and more due to low construction cost, quick construction progress, less occupied underground space and high operation safety, and the tunnel is large in section and needs to be provided with an intermediate wall and an evacuation platform. Because the top and two linings are connected when the intermediate wall is under construction and are handled complicatedly, still need to install various cable lines on the intermediate wall, bear later stage operation wind load and other additional loads after, often need artifical to carry out the high altitude construction to the maintenance of the crack of intermediate wall top, vault department hourglass and above-mentioned equipment facility change.
High-altitude operation in subway tunnel sections is usually long in construction distance and short in operation time, and large rail-mounted ladder vehicles cannot enter the field. The movable scaffold which can be quickly assembled and disassembled and is convenient to manually carry in the currently available subway tunnel mainly aims at a small-section circular tunnel, and does not consider the influence of auxiliary facilities such as an evacuation platform, a cable truss and the like in the tunnel; other portable scaffolds are rail-mounted scaffolds, often the structure is complicated, and the dead weight is great, can not quick assembly and disassembly, the manual handling of being not convenient for, for example, CN201820921008.5 discloses a counterfort formula that is used for subway tunnel rail-mounted area removes scaffold and the novel portable scaffold that CN201721911339.2 disclosed.
Therefore, to big section tunnels such as single hole double-line, the urgent need designs one kind and can dismantle the equipment fast, the manual handling's of being convenient for removal scaffold.
Disclosure of Invention
The invention provides a movable scaffold device for high-altitude operation of a subway tunnel, and aims to solve the problems in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a movable scaffold device for high-altitude operation of a subway tunnel comprises 2 side brackets which are oppositely arranged, wherein the front ends and the rear ends of the 2 side brackets are respectively detachably and fixedly connected through a plurality of scissor supports; one or more additional supports are respectively arranged at the top ends of the 2 side supports in a superposition mode, the left and right opposite additional supports are also detachably and fixedly connected through a scissor support, a plurality of transverse steel pipes are respectively arranged on the oppositely arranged side supports and the oppositely arranged additional supports at intervals, a hanging plate mechanism is detachably and fixedly connected between the left and right opposite 2 transverse steel pipes, and the hanging plate mechanism can form a construction platform or a stair structure in a height combination mode; the front end both sides of collateral branch frame bottom fixed walking wheel that is equipped with respectively, 2 walking wheels are connected with track 2 in the tunnel, can dismantle the fixedly connected with universal wheel respectively in the rear end both sides of collateral branch frame bottom, the lower extreme of universal wheel and the upper surface of sparse platform contact, walking wheel and universal wheel all be equipped with brake assembly.
Preferably, the front end and the rear end of the side support and the additional support are longitudinally welded with a plurality of studs protruding outwards, connecting holes are formed in 4 end portions of the cross brace, and the studs penetrate through the connecting holes and are locked by nuts.
Preferably, the additional support and the side support respectively comprise 2 vertical rods which are oppositely arranged in the front and at the back, the two ends of each transverse steel pipe are welded with the 2 vertical rods, and the plurality of transverse steel pipes are uniformly distributed along the longitudinal direction.
Preferably, the bottom end of the additional bracket is provided with a first spigot steel pipe, the top end of the side bracket is provided with a first bell mouth steel pipe, and the bottom end of the additional bracket is fixedly connected with the top end of the side bracket in a socket joint manner; 2 montant bottoms of 2 collateral branch framves rear end are equipped with the second bellmouth steel pipe, the top welding of universal wheel have the second socket steel pipe, universal wheel and collateral branch frame with the mode fixed connection of socket joint.
Preferably, the anti-skidding base seat comprises an anti-skidding base seat used for replacing the universal wheels, an inserted bar is welded at the upper end of the anti-skidding base seat along the longitudinal direction, external threads are arranged on the outer surface of the inserted bar and connected with a rotating clamping plate in a screwed mode, the upper portion of the inserted bar is inserted into the second bell mouth steel pipe, and the upper end face of the rotating clamping plate abuts against the lower end of the second bell mouth steel pipe.
Preferably, the plate hanging mechanism comprises a hanging plate and a jaw assembly, and two ends of the hanging plate are detachably and fixedly connected with the left and right transverse steel pipes through the jaw assembly.
Preferably, the jaw assembly is a jaw fixedly connected to two ends of the hanging plate.
Preferably, the clamping jaw assembly comprises a plurality of fixed sleeves which are sleeved on the transverse steel pipe and locked by positioning bolts, and a steel belt arranged between 2 vertically adjacent fixed sleeves, the upper end and the lower end of the steel belt are respectively fixedly connected with the fixed sleeves above and below through bolts, a plurality of hanging holes are uniformly formed in the steel belt along the longitudinal direction, 2 internal thread holes are respectively formed in two ends of each hanging plate, stud bolts are screwed in the internal thread holes, and the outer side ends of the stud bolts penetrate through the hanging holes and are locked through nuts; the hanging plate is used for building construction platforms with various heights according to construction requirements, or building a stair structure for people to walk or transport appliances in a height combination mode.
Preferably, the outer side of the side support is fixedly connected with a crawling ladder through bolts, and anti-falling clamping plates are respectively arranged on the front side and the rear side of the travelling wheel.
The movable scaffold device for the subway tunnel high-altitude operation has the beneficial effects that:
1. the large-scale rail-mounted elevator car is of an assembled structure, is convenient to disassemble and transport, and effectively solves the problem that the large-scale rail-mounted elevator car cannot enter the field;
2. the tunnel is simple and firm in structure, adjustable in angle, convenient to move in the tunnel and convenient to use, and the walking wheels and the universal wheels are arranged;
3. the invention can build construction platforms with various heights according to construction requirements, fully meets the construction requirements, can build a stair structure according to the requirements, and is convenient for personnel to walk up and down and transport appliance materials.
Drawings
FIG. 1 is a schematic diagram of the main structure of the present invention;
FIG. 2 is a side view of the main structure of the present invention;
FIG. 3 is a cross-brace construction of the present invention;
FIG. 4 is a view showing the installation structure of the anti-slip base according to the present invention;
FIG. 5 is a side schematic view of another jaw assembly embodiment of the present invention;
1. a side bracket; 2. a track; 3. an evacuation platform; 4. a scissor support; 5. connecting holes; 6. a stud; 7. hanging the plate; 8. a transverse steel pipe; 9. a jaw assembly; 9-1, steel strips; 9-2, hanging holes; 9-3, fixing sleeves; 9-4, an internal threaded hole; 10. an additional bracket; 11. a first spigot steel pipe; 12. a first bellmouth steel pipe; 13. a traveling wheel; 14. an anti-drop clamp plate; 15. a second spigot steel pipe; 16. a universal wheel; 17. a second bellmouth steel pipe; 18. an anti-skid base seat; 19. rotating the clamping plate; 20. climbing a ladder; 21. a stud bolt.
Detailed Description
In the following, embodiments of the present invention are described in detail in a stepwise manner, which is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are only used for describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation and a specific orientation configuration and operation, and thus, the present invention is not to be construed as being limited thereto.
Examples 1,
A movable scaffold device for subway tunnel high-altitude operation is disclosed, as shown in figure 1, comprising 2 oppositely arranged side brackets 1, wherein the front ends and the rear ends of the 2 side brackets 1 are respectively detachably and fixedly connected through a plurality of scissor supports 4; one or more additional supports 10 are respectively arranged at the top ends of the 2 side supports 1 in a superposition mode, the left and right opposite additional supports 10 are also detachably and fixedly connected through a scissor support 4, a plurality of transverse steel pipes 8 are respectively arranged on the oppositely arranged side supports 1 and the oppositely arranged additional supports 10 at intervals, a hanging plate mechanism is detachably and fixedly connected between the left and right opposite 2 transverse steel pipes 8, and the hanging plate mechanism can form a construction platform or a stair structure in a height combination mode; the two sides of the front end of the bottom of the side support 1 are respectively and fixedly provided with a traveling wheel 13, 2 traveling wheels 13 are connected with a track 2 in a tunnel, two sides of the rear end of the bottom of the side support are respectively and fixedly connected with a universal wheel 16 in a detachable manner, the lower end of the universal wheel 16 is in contact with the upper surface of the evacuation platform 3, and the traveling wheels 13 and the universal wheels 16 are respectively provided with a brake assembly;
as shown in fig. 2 and 3, a plurality of studs 6 protruding outwards are welded at the front end and the rear end of each of the side bracket 1 and the additional bracket 10 along the longitudinal direction, connecting holes 5 are formed at 4 end parts of each of the cross braces 4, and the studs 6 penetrate through the connecting holes 5 and lock the cross braces 4 through nuts;
as shown in fig. 1 and 2, the additional bracket 10 and the side bracket 1 both include 2 vertical rods (not labeled in the figures) arranged oppositely in the front and back direction, two ends of the transverse steel pipe 8 are welded with the 2 vertical rods, and the plurality of transverse steel pipes 8 are uniformly distributed along the longitudinal direction;
as shown in fig. 1, a first spigot steel pipe 11 is arranged at the bottom end of the additional bracket 10, a first bell mouth steel pipe 12 is arranged at the top end of the side bracket 1, and the bottom end of the additional bracket 10 is fixedly connected with the top end of the side bracket 1 in a socket manner; the bottom ends of 2 vertical rods at the rear ends of the 2 side supports 1 are provided with second bell mouth steel pipes 17, the top ends of the universal wheels 16 are welded with second socket steel pipes 15, and the universal wheels 16 are fixedly connected with the side supports 1 in a socket manner; by analogy, if a plurality of layers of additional supports are to be stacked, the adjacent additional supports are connected in an inserting manner;
as shown in fig. 4, the anti-skid base 18 for replacing the universal wheel is further included, an inserted bar is welded at the upper end of the anti-skid base 18 along the longitudinal direction, external threads are arranged on the outer surface of the inserted bar, a rotating clamping plate 19 is screwed in the inserted bar, the upper portion of the inserted bar is inserted into the second bell mouth steel pipe 17, and the upper end surface of the rotating clamping plate 19 abuts against the lower end of the second bell mouth steel pipe 17; when the rotating clamping plate 19 rotates, the position of the rotating clamping plate on the inserted rod can be adjusted, so that the height of the rear end of the side bracket is adjusted;
as shown in fig. 1, the hanging plate mechanism comprises a hanging plate 7 and a jaw assembly 9, wherein two ends of the hanging plate 7 are detachably and fixedly connected with a left lateral steel pipe 8 and a right lateral steel pipe 8 through the jaw assembly 9;
as shown in fig. 1, the jaw assembly 9 is a jaw fixedly connected to two ends of the hanging plate 7;
as shown in fig. 1 and 2, a ladder stand 20 is fixedly connected to the outer side of the side stand by means of bolts, and anti-slip catch plates 14 are provided on the front and rear sides of the traveling wheels 13.
In the embodiment, the additional support is superposed, so that the tunnel can meet the construction requirements of various heights, the walking wheels and the universal wheels can be used for conveniently moving in the tunnel, and the balance degree of the tunnel can be adjusted through the anti-skidding base 18 and the rotating clamping plate 19, so that the tunnel meets the construction requirements and provides good support; the danger of derailing of the travelling wheels can be prevented by the anti-falling clamping plate 14 (which is welded at the bottom end of the vertical rod and extends to the outer side of the track); the structure of the invention can be stable through the cross braces and the transverse steel pipes; in addition, the hanging plate 7 can be used for building a construction platform and can also be used for forming a stair structure, the former is convenient to construct and use, and the latter is convenient for people to walk up and down and transport appliances.
Examples 2,
This example is an improvement over example 1, with the only difference being that:
as shown in fig. 1 and 5, the jaw assembly 9 includes a plurality of fixing sleeves 9-3 which are sleeved on the transverse steel pipe 8 and locked by positioning bolts, and a steel belt 9-1 which is arranged between 2 adjacent fixing sleeves, wherein the upper end and the lower end of the steel belt 9-1 are respectively fixedly connected with the fixing sleeves at the upper part and the lower part by bolts, a plurality of hanging holes 9-2 are uniformly arranged on the steel belt 9-1 along the longitudinal direction, 2 internal thread holes (not shown in the figure) are respectively arranged at the two ends of the hanging plate 7, a stud bolt 21 is screwed in the internal thread hole, and the outer end of the stud bolt 21 passes through the hanging hole 9-2 and is locked by a nut; the hanging plate 7 is used for building construction platforms with various heights according to construction requirements, or building a stair structure for people to walk or transport appliances in a height combination mode.
In the last embodiment, although hanging board 7 also can build construction platform and stair structure, nevertheless because the distance between the horizontal steel pipe 8 of upper and lower adjacent is often great, can lead to stair structure to be difficult to use, and construction platform's height can confine the height of horizontal steel pipe to, because horizontal steel pipe's height is fixed, can lead to construction platform's height unable regulation, can not satisfy the construction needs under some circumstances.
In this embodiment, through installing the link plate at same height, can set up construction platform (not drawn in the picture), because during construction, the high relation of platform whether the workman can touch the construction position, also is concerned with workman's comfort level during construction simultaneously, so construction platform's height is vital. According to the invention, the plurality of hanging holes 9-2 with different heights are arranged in the jaw assembly 9, so that a construction platform can be built at any height, not only can a worker have a comfortable body position during construction, but also construction requirements of various heights can be met. In addition, through this embodiment, as shown in fig. 5, a stair structure can be built, which is convenient for people to get on and off and transport appliances.
Claims (9)
1. A mobile scaffold device for subway tunnel high-altitude construction is characterized in that: the device comprises 2 side supports which are oppositely arranged, wherein the front ends and the rear ends of the 2 side supports are respectively detachably and fixedly connected through a plurality of scissor supports; one or more additional supports are respectively arranged at the top ends of the 2 side supports in a superposition mode, the left and right opposite additional supports are also detachably and fixedly connected through a scissor support, a plurality of transverse steel pipes are respectively arranged on the oppositely arranged side supports and the oppositely arranged additional supports at intervals, a hanging plate mechanism is detachably and fixedly connected between the left and right opposite 2 transverse steel pipes, and the hanging plate mechanism can form a construction platform or a stair structure in a height combination mode; the front end both sides of collateral branch frame bottom fixed walking wheel that is equipped with respectively, 2 walking wheels are connected with track 2 in the tunnel, can dismantle the fixedly connected with universal wheel respectively in the rear end both sides of collateral branch frame bottom, the lower extreme of universal wheel and the upper surface of sparse platform contact, walking wheel and universal wheel all be equipped with brake assembly.
2. The movable scaffold device for the high-altitude operation of the subway tunnel as claimed in claim 1, wherein: the front end and the rear end of the side support and the additional support are longitudinally welded with a plurality of studs protruding outwards, connecting holes are formed in 4 end portions of the cross brace, and the studs penetrate through the connecting holes and are locked by nuts.
3. The moving scaffold device for the subway tunnel high-altitude operation as claimed in claim 2, wherein: the additional support and the side support respectively comprise 2 vertical rods which are oppositely arranged in the front and the back, the two ends of each transverse steel pipe are welded with the 2 vertical rods, and the plurality of transverse steel pipes are uniformly distributed along the longitudinal direction.
4. A moving scaffold device for the aloft work of a subway tunnel as claimed in claim 3, wherein: the bottom end of the additional bracket is provided with a first socket steel pipe, the top end of the side bracket is provided with a first bellmouth steel pipe, and the bottom end of the additional bracket is fixedly connected with the top end of the side bracket in a socket joint mode; 2 montant bottoms of 2 collateral branch framves rear end are equipped with the second bellmouth steel pipe, the top welding of universal wheel have the second socket steel pipe, universal wheel and collateral branch frame with the mode fixed connection of socket joint.
5. The movable scaffold device for the high-altitude operation of the subway tunnel as claimed in claim 4, wherein: still including the anti-skidding end seat that is used for replacing the universal wheel, the upper end of anti-skidding end seat have the inserted bar along vertical welding, the inserted bar surface be equipped with the external screw thread to the spiro union has rotatory cardboard, inserted bar upper portion insert in the second bellmouth steel pipe, the up end of rotatory cardboard offset with the lower extreme of second bellmouth steel pipe.
6. A moving scaffold device for the aloft work of a subway tunnel according to any one of claims 1 to 5, wherein: the hanging plate mechanism comprises a hanging plate and a jaw assembly, and two ends of the hanging plate are detachably and fixedly connected with the left and right transverse steel pipes through the jaw assembly.
7. The movable scaffold device for the high-altitude operation of the subway tunnel as claimed in claim 6, wherein: the jaw components are jaws fixedly connected to two ends of the hanging plate.
8. The movable scaffold device for the high-altitude operation of the subway tunnel as claimed in claim 6, wherein: the clamping jaw assembly comprises a plurality of fixed sleeves which are sleeved on the transverse steel pipe and locked through positioning bolts, and a steel belt arranged between 2 vertically adjacent fixed sleeves, wherein the upper end and the lower end of the steel belt are respectively fixedly connected with the fixed sleeves above and below through bolts, a plurality of hanging holes are uniformly formed in the steel belt along the longitudinal direction, 2 internal thread holes are respectively formed in two ends of each hanging plate, a stud bolt is screwed in each internal thread hole, and the outer side end of each stud bolt penetrates through each hanging hole and is locked through a nut; the hanging plate is used for building construction platforms with various heights according to construction requirements, or building a stair structure for people to walk or transport appliances in a height combination mode.
9. The movable scaffold device for the high-altitude operation of the subway tunnel as claimed in claim 6, wherein: the outer side of the side support is fixedly connected with a crawling ladder through bolts, and anti-falling clamping plates are arranged on the front side and the rear side of the walking wheels respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110991893.0A CN113585696A (en) | 2021-08-27 | 2021-08-27 | Movable scaffold device for subway tunnel high-altitude operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110991893.0A CN113585696A (en) | 2021-08-27 | 2021-08-27 | Movable scaffold device for subway tunnel high-altitude operation |
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| Publication Number | Publication Date |
|---|---|
| CN113585696A true CN113585696A (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110991893.0A Pending CN113585696A (en) | 2021-08-27 | 2021-08-27 | Movable scaffold device for subway tunnel high-altitude operation |
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| CN (1) | CN113585696A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115126404A (en) * | 2022-06-24 | 2022-09-30 | 保利长大工程有限公司 | Slidable culvert safety cat ladder |
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| CN111155751A (en) * | 2020-01-19 | 2020-05-15 | 中交一公局厦门工程有限公司 | Foldable construction platform and construction method |
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2021
- 2021-08-27 CN CN202110991893.0A patent/CN113585696A/en active Pending
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115126404A (en) * | 2022-06-24 | 2022-09-30 | 保利长大工程有限公司 | Slidable culvert safety cat ladder |
| CN115126404B (en) * | 2022-06-24 | 2023-04-21 | 保利长大工程有限公司 | Slidable formula culvert safety cat ladder |
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Application publication date: 20211102 |