CN111173301A - Safety net protection frame and installation method thereof - Google Patents
Safety net protection frame and installation method thereof Download PDFInfo
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- CN111173301A CN111173301A CN202010101691.XA CN202010101691A CN111173301A CN 111173301 A CN111173301 A CN 111173301A CN 202010101691 A CN202010101691 A CN 202010101691A CN 111173301 A CN111173301 A CN 111173301A
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- 230000004224 protection Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000009434 installation Methods 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 126
- 239000010959 steel Substances 0.000 claims abstract description 126
- 230000003139 buffering effect Effects 0.000 claims abstract description 28
- 230000009194 climbing Effects 0.000 claims abstract description 14
- 238000010276 construction Methods 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 5
- 238000005452 bending Methods 0.000 description 7
- 238000010008 shearing Methods 0.000 description 6
- 238000004873 anchoring Methods 0.000 description 4
- 238000009435 building construction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/32—Safety or protective measures for persons during the construction of buildings
- E04G21/3204—Safety or protective measures for persons during the construction of buildings against falling down
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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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/32—Safety or protective measures for persons during the construction of buildings
- E04G21/3204—Safety or protective measures for persons during the construction of buildings against falling down
- E04G21/3219—Means supported by the building wall, e.g. security consoles
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
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Abstract
The invention discloses a safety net protection frame and an installation method thereof. The safety net protection frame has good bearing capacity, the erection of the protection frame can be simplified by a pin assembling connection mode among the steel pipe, the base and the connecting seat, the buffering elastic piece is arranged between the steel pipe and the base and is used for buffering when bearing impact load, and the problems of structural fracture and the like caused by rigid connection can be avoided. The installation method is simple and effective, and is based on the construction of the preformed hole of the climbing frame, so that the construction process is further simplified.
Description
Technical Field
The invention relates to the technical field related to building construction safety, in particular to a safety net protection frame and an installation method thereof.
Background
When the safety net is used for building construction at high altitude, the net with the protection function is arranged below or on the side of the safety net so as to prevent accidents caused by falling of people or objects. For the safety net vertically arranged, the traditional method is to bind the safety net together with one side of a steel pipe, and because the wind power in the air is large and the impact load resistance is not strong, the deformation problem of the safety net is easy to occur, and the safety protection level is low. It especially is under the condition of climbing the frame outside modern industrial building uses, and after climbing the frame and promoting, the outer wall of climbing the frame lower part does not have other protections, if someone or thing fall or fall from climbing the frame lower part from climbing the frame, then directly fall to the ground, very dangerous, based on this, designs a safety net protection frame, protects people or thing when the whereabouts, and can effectively reduce the impact force, protects personnel or the article that fall, improves the security.
Disclosure of Invention
The invention aims to provide a safety net protection frame and an installation method thereof, which aim to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a safety net guard comprising: the safety net is characterized in that one end of the steel pipe and the wall surface form a variable included angle structure and are erected on the wall, one end of the safety net is fixed on the wall, and the other end of the safety net is connected with the other end, far away from the wall surface, of the steel pipe.
The connecting position of one end of the steel pipe and the wall is lower than the position of one end of the safety net and the wall.
Steel pipe one end and wall be the contained angle structure that can change and set up on the wall, including base and steel sheet, the steel sheet passes through the crab-bolt to be fixed on the wall of wall, is fixed with the base on the steel sheet, set up open-ended cavity in the base, set up buffering elastic component in the cavity, the base lateral part sets up the pinhole that link up, and the steel pipe is provided with the pinhole, sets up the fixed pin in the pinhole, and the fixed pin runs through the pinhole connection on base, the steel pipe respectively, realizes that the steel pipe is connected at the cavity internal rotation of base, the cavity of steel pipe and base be connected between set up buffering elastic component, buffering elastic component makes the contained angle size change.
The steel pipe includes main pipe body and accessory pipe body, the accessory pipe body cover is established in main pipe body bottom, all sets up corresponding pinhole on accessory pipe body and the main pipe body, runs through respectively by the fixed pin and rotates with the base and be connected.
The top end of the main pipe body is provided with a pin hole, and the top end of the main pipe body is connected with a connecting seat through a pin shaft.
The connecting seats are provided with mounting holes, the connecting seats corresponding to the two adjacent steel pipes are connected through steel cables, and the other ends of the safety nets are tied and fixed on the steel cables.
The buffering elastic piece is a pressure spring.
The wall corresponds the fixed a plurality of solid fixed rings that set up of safety net mounted position, connect through the steel cable between the crab-bolt fixed ring, the one end of safety net is tied up firmly on the steel cable.
The utility model provides an installation method as above-mentioned safety net protection frame which characterized in that: the installation method is formed by erecting a safety net based on the inclined steel pipe and capable of elastically buffering, and comprises the following steps:
s1, the outer walls of the common climbing frame construction are provided with wall-penetrating screw holes with the approximate separation height of about 0.4-0.6 m, and the steel plates with bases and the fixing rings are installed at the reserved hole parts with the separation height;
s2, installing a connecting seat at one end of the steel pipe through a pin and a pin hole, sleeving the other end of the steel pipe at the bottom of the main pipe through the auxiliary pipe body, and connecting the steel pipe with the base through the pin, the pin hole and the buffering elastic piece in a variable included angle structure;
s3, connecting the corresponding connecting seats of the two adjacent steel pipes through steel cables;
s4, one end of the safety net is respectively connected to the fixing rings, and the other end of the safety net is tied and fixed on the steel cable, so that the safety net is horizontally placed to form the protective frame of the safety net outside the wall.
In step S4, the safety net can be horizontally placed after being lifted by the climbing frame before being horizontally placed.
Compared with the prior art, the invention has the beneficial effects that: the safety net protection frame has good bearing capacity, the erection of the protection frame can be simplified by a pin assembling connection mode among the steel pipe, the base and the connecting seat, the buffering elastic piece is arranged between the steel pipe and the base and is used for buffering when bearing impact load, and the problems of structural fracture and the like caused by rigid connection can be avoided. The installation method is simple and effective, and is based on the construction of the preformed hole of the climbing frame, so that the construction process is further simplified.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is a schematic view of the anchor fixing ring and the safety net according to the present invention.
FIG. 3 is a schematic view of the connection structure between the steel pipe and the base.
FIG. 4 is a schematic view of the connection structure of the steel pipe and the connecting seat of the present invention.
Fig. 5 is an enlarged schematic view of a portion a in fig. 1.
Fig. 6 is a reference diagram showing another effect of the overall structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 5, a safety net protection frame includes: safety net 2 and several steel pipes 3, 3 one end of steel pipe and wall 1 personally submit the contained angle structure that can change and take and establish on wall 1, the one end of safety net 2 is fixed on wall 1, the other end is connected with the other end of keeping away from the wall of steel pipe 3.
The connecting position of one end of the steel pipe 3 and the wall 1 is lower than the position of one end of the safety net 2 and the wall 1.
3 one end of steel pipe and wall 1 personally submit contained angle structure that can change and take and establish on wall 1, including base 4 and steel sheet 5, steel sheet 5 passes through the crab-bolt to be fixed on wall 1's wall, is fixed with base 4 on the steel sheet 5, set up the open-ended cavity in the base 4, set up buffering elastic component 41 in the cavity, the 4 lateral parts of base set up the pinhole that link up, steel pipe 2 is provided with the pinhole, sets up fixed pin 6 in the pinhole, fixed pin 6 runs through the pinhole connection on base 4, the steel pipe 2 respectively, realizes that steel pipe 2 is connected at the cavity internal rotation of base 4, the cavity of steel pipe 2 and base 4 be connected between and set up buffering elastic component 41, buffering elastic component 41 makes the contained angle size change between steel pipe and the.
The steel pipe 2 comprises a main pipe body 21 and an auxiliary pipe body 22, the auxiliary pipe body 22 is sleeved at the bottom of the main pipe body 21, and the auxiliary pipe body 22 and the main pipe body 21 are provided with corresponding pin holes which are respectively penetrated by fixing pins 6 to be rotatably connected with the base 4.
The top end of the main pipe body 31 is provided with a pin hole, and the top end of the main pipe body 31 is connected with a connecting seat 33 through a pin shaft 6.
The connecting seats 33 are provided with mounting holes, the connecting seats 33 corresponding to the two adjacent steel pipes 3 are connected through steel cables 34, and the other ends of the safety nets 2 are tied and fixed on the steel cables 34.
The buffering elastic part 41 is a compression spring, the buffering elastic part 41 can be directly welded in the cavity of the base 4, and a pressing block is arranged at the position of the auxiliary pipe body 32 corresponding to the buffering elastic part 41, so that good stress and compression with the buffering elastic part 41 are realized.
Wall 1 corresponds that safety net 2 mounted position is fixed to set up a plurality of solid fixed rings 21, connect through steel cable 34 between the solid fixed ring 21 of crab-bolt, the one end of safety net 2 is tied up fixedly on steel cable 34.
The utility model provides an installation method as above-mentioned safety net protection frame which characterized in that: the installation method is formed by erecting a safety net based on the inclined steel pipe and capable of elastically buffering, and comprises the following steps:
s1, the outer walls of the common climbing frame construction are provided with wall-through screw holes with the approximate separation height of about 0.4-0.6 m, and the steel plate 5 with the base 4 and the fixing ring 21 are installed at the reserved hole part with the separation height;
s2, installing a connecting seat 33 at one end of the steel pipe 3 through a pin and a pin hole, sleeving the other end of the steel pipe at the bottom of the main pipe body 21 through the auxiliary pipe body 22, and connecting the steel pipe with the base 4 through the pin, the pin hole and the buffering elastic piece 41 in a variable included angle structure;
s3, connecting the corresponding connecting seats 33 of the two adjacent steel pipes 3 through the steel cables 34;
s4, one end of the safety net 2 is respectively connected to the fixing rings 21, and the other end of the safety net 2 is tied and fixed on the steel cable 34, so that the safety net 2 is horizontally placed to form the protective frame of the safety net outside the wall.
In step S4, the safety net 2 can be horizontally placed after being lifted by the climbing frame before being horizontally placed.
Wherein the steel pipe is
The thickness is 3.0mm, the total length of the steel pipe is 3000mm, and the angle of the inclined steel pipe is 21-30 degrees. The connecting screw (i.e., the pin) between the steel tube and the steel plate is M16 × 160, and the wall-through screw is M16 × 260.
This safety net protection frame has fine bearing capacity, can simplify the erectting of protection frame through the mode of pin assembled connection between steel pipe and base, connecting seat, and set up the buffering elastic component between steel pipe and base, cushions when bearing impact load, can avoid because of the structural fracture scheduling problem that rigid connection produced. The installation method is simple and effective, and is based on the construction of the preformed hole of the climbing frame, so that the construction process is further simplified.
Carry out structure check to above-mentioned safety net protection frame:
firstly, calculating the bearing capacity of the oblique steel pipe:
1. looking up 4.4.1 steel structure design standard GB 50017-2017, the bending strength design value f of the steel pipe is 215N/mm2Design value f of shear strengthv＝125N/mm2。
Assuming that a person weighs 65kg, falls from 10m, lands on the safety net, and has an impact time of 0.8s, the impact load is:
impact load on the safety net is transmitted to the wall 1 and the inclined steel pipes 3, and the two steel pipes 3 and two points on the wall 1 form a rectangular safety net 2 in a surrounding mode. Assuming that the load is uniformly transmitted to four angular points, the vertical pressure applied to the end of one inclined steel pipe 3 is 0.28kN, the horizontal distance between the end of the steel pipe 3 and the steel plate 5 is about 2600mm, and the maximum shearing force and bending moment applied to the steel pipe are calculated as follows:
Vmax＝0.28kN，Mmax＝0.28×2.6＝0.73kN·m
the steel pipe frame is erected on the steel plate, and is simplified into a hinged joint, so that the load of the steel plate at the steel pipe frame erection position is as follows:
the shearing force at the bolt connected with the steel pipe is as follows: f1＝4.3-0.28＝4.02kN
2. Calculating the bending resistance bearing capacity according to the steel structure design standard GB 50005-2017 6.1.1:
meets the requirements.
3. Calculating the shear resistance according to the steel structure design standard GB 50017-2017 6.1.3:
meets the requirements.
4. Therefore, the bearing capacity of the oblique steel pipe 3 meets the design requirement.
Second, calculating the bearing capacity of the steel plate at the bolt joint
Looking up 4.4.1 steel structure design standard GB 50017-2017, the bending strength design value f of the steel plate 5 is 215N/mm2Design value f of shear strengthv＝125N/mm2。
1. The bolt penetrates through the two steel plates and the steel pipe to fix the steel pipe on the steel plates. From the previous calculation, the maximum shearing force and bending moment applied to the steel plate are as follows:
2. calculating the shear resistance according to the steel structure design standard GB 50017-2017 6.1.3:
meets the requirements.
3. Calculating the bending resistance bearing capacity according to the steel structure design standard GB 50017-2017 6.1.1:
meets the requirements.
4. Therefore, the bearing capacity of the steel plate meets the design requirement.
Checking and calculating bearing capacity of bolt
The shear strength design value of the bolt can be obtained by checking the design standard GB 50017-2017 of steel structure for 4.4.6 bolts of M16
1. From the foregoing calculation, the maximum shear force to which the bolt is subjected
2. Calculating the shear-resistant bearing capacity of the bolt according to a steel structure design standard GB 50017-2017 11.4.1:
3. the bearing capacity of the bolt therefore meets the design requirements.
Bearing capacity of check calculation anchor bolt
The steel plate is fixed with the wall 1 through an anchor bolt, the anchor bolt is made of carbon steel, the performance grade is 5.8, the effective diameter is 14.123mm, and the effective cross-sectional area is 156.7mm 2. Obtaining a standard value f of the yield strength of the anchor bolt by checking the technical specification of anchoring after concrete structure JGJ 145-2013 (3.2.3)yk＝400N/mm2。
1. And (3) uniformly shearing the anchor bolts, wherein the shearing force borne by the anchor bolts is 0.5kN, and the shearing resistance bearing capacity of the anchor bolts is calculated according to the technical specification of post-anchoring of a concrete structure, namely JGJ 145-2013 6.1.13:
VRk，s＝0.5fykAs＝0.5×400×156.7＝31.3kN
meets the requirements.
The anchor bolt is subjected to the action of bending moment and is pulled, and the tensile bearing capacity of the anchor bolt is calculated according to the technical specification of post-anchoring of a concrete structure, namely JGJ 145-2013, 6.1.1, so that:
Mmax＝4.3×0.25-4.02×0.07＝0.8kN·m
NRk，s＝fykAs＝400×156.7＝62.7kN
meets the requirements.
3. According to the technical specification of post-anchoring of a concrete structure JGJ 145-2013 6.1.28, the method comprises the following steps of calculating the breaking bearing capacity of anchor bolt steel under the condition of tension-shear composite stress:
meets the requirements.
4. The bearing capacity of the anchor bolt therefore meets the design requirements.
In conclusion, the safety net protection frame has good bearing capacity, the erection of the protection frame can be simplified by the pin assembling connection mode among the steel pipe, the base and the connecting seat, and the buffering elastic piece 41 is arranged between the steel pipe 3 and the base 4 and is used for buffering when bearing impact load, so that the problems of structural fracture and the like caused by rigid connection can be avoided.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A safety net guard comprising: the safety net is characterized in that one end of the steel pipe (3) and the wall (1) form a changeable included angle structure and are erected on the wall (1), one end of the safety net (2) is fixed on the wall (1), and the other end of the safety net is connected with the other end, far away from the wall surface, of the steel pipe (3).
2. A safety net guard frame as claimed in claim 1, wherein: the connecting position of one end of the steel pipe (3) and the wall (1) is lower than the position of one end of the safety net (2) and the wall (1).
3. A safety net guard frame as claimed in claim 1, wherein: one end of the steel pipe (3) and the wall (1) form a changeable included angle structure which is erected on the wall (1) and comprises a base (4) and a steel plate (5), the steel plate (5) is fixed on the wall surface of the wall (1) through anchor bolts, the base (4) is fixed on the steel plate (5), an open cavity is arranged in the base (4), a buffering elastic piece (41) is arranged in the cavity, a through pin hole is arranged at the side part of the base (4), a pin hole is arranged on the steel pipe (2), a fixing pin (6) is arranged in the pin hole, the fixing pin (6) respectively penetrates through the base (4) and the pin hole on the steel pipe (2) to be connected, so that the steel pipe (2) can be rotatably connected in the cavity of the base (4), the cavity of steel pipe (2) and base (4) be connected between set up buffering elastic component (41), buffering elastic component (41) make the contained angle size change between steel pipe and the base.
4. A safety net guard frame as claimed in claim 3, wherein: the steel pipe (2) comprises a main pipe body (21) and an auxiliary pipe body (22), wherein the auxiliary pipe body (22) is sleeved at the bottom of the main pipe body (21), the auxiliary pipe body (22) and the main pipe body (21) are respectively provided with corresponding pin holes, and the auxiliary pipe body and the main pipe body are respectively penetrated through by fixing pins (6) and are rotatably connected with the base (4).
5. A safety net guard frame according to claim 4, wherein: the top end of the main pipe body (31) is provided with a pin hole, and the top end of the main pipe body (31) is connected with a connecting seat (33) through a pin shaft (6).
6. A safety net guard frame according to claim 5, wherein: the connecting seats (33) are provided with mounting holes, the connecting seats (33) corresponding to the two adjacent steel pipes (3) are connected through steel cables (34), and the other ends of the safety nets (2) are tied and fixed on the steel cables (34).
7. A safety net guard frame as claimed in claim 3, wherein: the buffering elastic piece (41) is a pressure spring.
8. A safety net guard frame as claimed in claim 1, wherein: wall (1) correspond safety net (2) mounted position and fixedly set up a plurality of solid fixed rings (21), connect through steel cable (34) between the solid fixed ring of crab-bolt (21), the one end of safety net (2) is tied up fixedly on steel cable (34).
9. A method of installing a safety net guard according to any of claims 1 to 8, wherein: the installation method is formed by erecting a safety net based on the inclined steel pipe and capable of elastically buffering, and comprises the following steps:
s1, the outer walls of common climbing frame construction are provided with wall-through screw holes with approximate separation height of about 0.4-0.6 m, and the steel plate (5) with the base (4) and the fixing ring (21) are installed at the reserved hole part with separation height;
s2, installing a connecting seat (33) at one end of the steel pipe (3) through a pin and a pin hole, sleeving the other end of the steel pipe at the bottom of the main pipe body (21) through the auxiliary pipe body (22), and connecting the steel pipe with the base (4) through the pin, the pin hole and a buffering elastic piece (41) in a variable included angle structure;
s3, connecting the corresponding connecting seats (33) of the two adjacent steel pipes (3) through steel cables (34);
s4, one end of the safety net (2) is respectively connected to the fixing ring (21), and the other end of the safety net is tied and fixed on the steel cable (34) to realize the horizontal placement of the safety net (2) and form the protection frame of the safety net outside the wall.
10. The method of installing a safety net guard according to claim 9, wherein: in step S4, the safety net (2) can be horizontally placed after being lifted by a climbing frame before being horizontally placed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010101691.XA CN111173301A (en) | 2020-02-19 | 2020-02-19 | Safety net protection frame and installation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010101691.XA CN111173301A (en) | 2020-02-19 | 2020-02-19 | Safety net protection frame and installation method thereof |
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| CN111173301A true CN111173301A (en) | 2020-05-19 |
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| CN202010101691.XA Pending CN111173301A (en) | 2020-02-19 | 2020-02-19 | Safety net protection frame and installation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113863700A (en) * | 2021-10-30 | 2021-12-31 | 中国十七冶集团有限公司 | Automatic elevator shaft protection device and operation method |
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| CN206903256U (en) * | 2017-07-19 | 2018-01-19 | 深圳中海建筑有限公司 | Assembled integral concrete shear wall structure regularization safety net |
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| CN211850993U (en) * | 2020-02-19 | 2020-11-03 | 中天华南建设投资集团有限公司 | A connection structure for safety net protection frame |
| CN212562584U (en) * | 2020-02-19 | 2021-02-19 | 中天华南建设投资集团有限公司 | Steel pipe structure for safety net protection frame |
| CN212562583U (en) * | 2020-02-19 | 2021-02-19 | 中天华南建设投资集团有限公司 | Safety net protection frame |
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2020
- 2020-02-19 CN CN202010101691.XA patent/CN111173301A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204266609U (en) * | 2014-11-21 | 2015-04-15 | 长沙远大住宅工业集团有限公司 | Assembled architecture faces limit horizontal protective and chooses net system |
| CN206903256U (en) * | 2017-07-19 | 2018-01-19 | 深圳中海建筑有限公司 | Assembled integral concrete shear wall structure regularization safety net |
| CN207406030U (en) * | 2017-11-03 | 2018-05-25 | 中国新兴建筑工程总公司 | A kind of standard safety guard net truss |
| CN211850993U (en) * | 2020-02-19 | 2020-11-03 | 中天华南建设投资集团有限公司 | A connection structure for safety net protection frame |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113863700A (en) * | 2021-10-30 | 2021-12-31 | 中国十七冶集团有限公司 | Automatic elevator shaft protection device and operation method |
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