CN114016758B - Retractable umbrella-shaped horizontal hole protecting tool easy to turnover and protecting method - Google Patents
Retractable umbrella-shaped horizontal hole protecting tool easy to turnover and protecting method Download PDFInfo
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- CN114016758B CN114016758B CN202111500489.5A CN202111500489A CN114016758B CN 114016758 B CN114016758 B CN 114016758B CN 202111500489 A CN202111500489 A CN 202111500489A CN 114016758 B CN114016758 B CN 114016758B
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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
- E04G21/3252—Protections, e.g. cover, caps, against impaling on starter reinforcement bars
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Abstract
The invention discloses an easily-circulated telescopic umbrella-shaped horizontal hole opening protection tool and a protection method, which comprises the following steps: the regular polygon bottom frame is formed by connecting a plurality of first square pipes end to end; the main protection frame comprises at least three second square pipes and regular polygon connecting rings, the number of the sides of the regular polygon connecting rings and the number of the sides of the regular polygon bottom frame are consistent with the number of the second square pipes, one end of each of the second square pipes is rotatably connected with each side of the regular polygon connecting ring, and one end, far away from the regular polygon connecting rings, of each of the second square pipes is rotatably connected with each angle of the regular polygon bottom frame; the invention can effectively deal with the safety protection of horizontal protective holes with various sizes and solve the problems that the traditional steel pipe protective guard for the hole has high construction cost, needs to be erected and dismantled layer by layer and the like.
Description
Technical Field
The invention belongs to the technical field of building construction safety protection, and particularly relates to an easily-turnover telescopic umbrella-shaped horizontal hole protection tool and a protection method.
Background
In recent years, with the continuous expansion of building construction scale, building structure construction is more complex and diversified, various safety accidents of adjacent edges and holes often occur, and the accident rate that a horizontal hole falls from a high place or falls to hurt people in the whole building construction accident is increased. Therefore, the protection of the inside and the outside of the horizontal cave of the high-rise building is particularly important on the current construction site. At present, each construction site protects the operation surface of a horizontal portal, and mainly utilizes steel pipes and fasteners to be erected or finished net pieces to be provided with edge-facing barriers, each layer of the method can not be continuously used after being erected, and great potential safety hazards exist, so that high falling accidents are caused due to the fact that the protection is not tight (or easy to be dismantled) or the height is not in line with the requirement, and the edge-facing barriers are installed and installed insecurely.
How to improve the safety protection performance of the opening at a high level is a problem to be solved urgently by the technical personnel in the field.
The Chinese patent with publication number CN112962994A discloses a protection device and a protection method for an edge opening, which comprises two supporting upright rods, wherein the two supporting upright rods are respectively fixed on two sides of the edge opening; the supporting cross rods are in sliding fit with the sliding grooves, and the supporting cross rods and the sliding grooves are respectively and fixedly connected with the supporting vertical rods; the protective vertical rods are arranged between the two supporting vertical rods, one ends of the protective vertical rods are connected with the supporting cross rods, and the other ends of the protective vertical rods are connected with the protective cross rods; the foot blocking plate is arranged between the protective cross rod and one of the supporting cross rods; through the sliding fit between support horizontal pole and the spout to the distance between regulation support horizontal pole and the spout, thereby the realization protects different edge opening.
Although one edge of the edge opening protection device can be well protected, the protection device is difficult to protect four edges of a horizontal opening.
Disclosure of Invention
The invention aims to provide an easily-turnover telescopic umbrella-shaped horizontal hole protection tool and a protection method aiming at the problems in the prior art.
In order to realize the purpose, the invention adopts the technical scheme that:
the utility model provides an easy turnover telescopic umbrella form horizontal entrance to a cave protection instrument, includes:
the regular polygon bottom frame is formed by connecting a plurality of first square pipes end to end;
the main protection frame comprises at least three second square pipes and regular polygon connecting rings, the number of the sides of the regular polygon connecting rings and the number of the sides of the regular polygon bottom frame are consistent with the number of the second square pipes, one end of each of the second square pipes is rotatably connected with each side of the regular polygon connecting ring, and one end, far away from the regular polygon connecting rings, of each of the second square pipes is rotatably connected with each angle of the regular polygon bottom frame;
the first square pipe and the two second square pipes connected with the first square pipe are encircled to form a protective side frame, a plurality of protective supporting rods are arranged on the protective side frame, and two ends of each protective supporting rod are detachably connected with two edges of the protective side frame respectively;
the first square pipe and the second square pipe are both telescopic square pipes; the protection supporting rod is a telescopic supporting rod;
the regular polygon connecting ring is formed by connecting a plurality of round steel end to end.
According to the invention, the regular polygon bottom frame is fixed with the periphery of the opening, the horizontal opening is covered by the main protection frame and the protection side frame, so that the safety protection of the horizontal opening is realized, wherein the regular polygon bottom frame and the main protection frame are both composed of square tubes, and all parts are firmly connected with each other, so that the protection effect is good.
The first square pipe and the second square pipe are telescopic square pipes, and the protection supporting rod is also a telescopic supporting rod, so that the second square pipe and the protection supporting rod can be shortened after the protection tool is used, the protection tool is folded into a structure approximate to a plane, and the protection tool is convenient to store and transport; can also stretch out and draw back first side pipe, second side pipe and protection branch cooperation are flexible simultaneously, the size of adjustment regular polygon underframe to adapt to the entrance to a cave of multiple size, application scope is wide, but reuse, and the turnover nature is strong.
Furthermore, two adjacent first square pipes are fixed through a rotating shaft, and two ends of the rotating shaft are fixed with the end portions of the two corresponding first square pipes respectively.
Further, second side pipe passes through the pivot with the angle of regular polygon underframe is connected, the pivot is worn to locate its correspondence the lateral wall of second side pipe end portion, and with second side pipe rotary type is connected, and the end connection through two first side pipes in the pivot that sets up and a second side pipe is in the same place, and realize second side pipe with the angle rotary type of regular polygon underframe is connected, makes second side pipe can contract in a flexible way, and the pivot is in the same place through the welding with first side pipe, and the pivot is all run through second side pipe end portion two relative sides, firm in connection, and safety protection is effectual.
Furthermore, the end part of the protection supporting rod is connected with the edge of the protection side frame through a connecting piece, the connecting piece comprises a U-shaped steel sheet and an eyelet bolt, the U-shaped steel sheet is clamped on the edge of the protection side frame, a screw hole is formed in the U-shaped steel sheet, the eyelet bolt is in threaded connection with the screw hole and used for fixing the U-shaped steel sheet with the edge of the protection side frame, the end part of the protection supporting rod is connected with the eyelet bolt through a hanging buckle, when the edge of the protection side frame stretches out and draws back, the eyelet bolt can be unscrewed to adjust the position of the U-shaped steel sheet, and then the position of the protection supporting rod is adjusted, so that the size of the tool is changed to adapt to holes with different sizes; the hanging buckle is a circular hanging buckle, an openable gap is formed in the hanging buckle, the gap is opened to hang the hanging ring into the eyelet of the eyelet bolt, then the gap of the hanging ring is closed, and the protective supporting rod can be connected with the eyelet bolt.
Furthermore, a hanging ring is fixed on the regular polygon connecting ring, so that the main protective frame or the protective tool can be moved conveniently.
Further, the quantity of second side pipe is 4 to the entrance to a cave of adaptation square, and corresponding regular polygon underframe is square underframe, and regular polygon go-between is square go-between.
Further, be located same on the protection side frame protection branch all mutual parallel arrangement is located same on the protection side frame the interval 200mm sets up between the protection branch, avoids the staff to pass the protection side frame, protection branch's one end with first side union coupling, the other end with second side union coupling, and every all be connected with on the second side pipe protection branch, protection branch also play the effect of strengthening the relation of connection between first side pipe and the second side pipe when playing the guard action, through the aforesaid setting, under the condition that uses less protection branch, still can play better safety protection effect, and the better relation of connection between first side pipe and the second side pipe of strengthening, its hookup location is more even.
The invention also provides a horizontal portal protection method, based on the protection tool, comprising the following steps:
(1) Rechecking the maximum horizontal opening size of the floor according to the construction blueprint;
(2) Determining the sizes of the first square pipe and the second square pipe according to the largest horizontal opening size of a floor, so that the size of the tool is enough to completely cover the opening, the first square pipe is fixed with the floor, and the distance between the first square pipe and the edge of the opening is 100-200 mm;
(3) Two opposite side walls at one end of the second square pipe are drilled, the distance between the drilled holes and the end face of the second square pipe is 15mm, the hole diameter is 13mm, the round steel is inserted, the round steel is 90mm long A12 antirust round steel, one end of the round steel enters from one hole, the other end of the round steel exits, two ends of the round steel are located on two sides of the second square pipe, and a plurality of round steels are welded end to form the regular polygon connecting ring;
(4) The regular polygon connecting ring is welded with a hanging ring, and when the regular polygon connecting ring is a square connecting ring, two opposite corners of the hanging ring and the regular polygon connecting ring are welded and fixed;
(5) Drilling a hole in the side wall of one end, far away from the round steel, of the second square pipe, wherein the hole is 13mm in aperture and 10mm away from the end face of one end, far away from the round steel, of the second square pipe, inserting the rotating shaft, wherein the rotating shaft is an A12 round steel shaft 70mm long, and two ends of the rotating shaft are respectively welded with one end, corresponding to the rotating shaft, of the first square pipe;
(6) The U-shaped steel sheet is clamped on two edges of the protection side frame, the U-shaped steel sheet is fixed with the edges of the protection side frame through the eyelet bolts, the protection support rods are connected with the eyelet bolts through the hanging buckles, and the hanging buckles are fixed with the protection support rods through welding.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention can effectively deal with the safety protection of horizontal protective holes with various sizes, and solves the problems that the traditional steel pipe protective guard at the hole has high construction cost, needs to be erected and dismantled layer by layer and the like.
(2) The invention can freely stretch out and draw back, is suitable for the protection of horizontal openings with various sizes, is easy to turnover, can be directly turned over to the (N + 1) th layer for use after the construction of the Nth layer is finished, and does not need to be disassembled or reassembled.
(3) The invention saves labor and erection cost, is safe and reliable, and is simple, convenient and quick to construct.
Drawings
FIG. 1 is a schematic structural view of an easily-revolving telescopic umbrella-shaped horizontal tunnel portal protection tool of the present invention;
FIG. 2 is a top view of the retractable umbrella-shaped horizontal portal protection tool of the present invention;
FIG. 3 is a schematic view of the structure of the present invention at the position of the rotating shaft;
FIG. 4 is a schematic view of the structure of the connector of the present invention;
in the figure: 1. a first square tube; 2. a second square tube; 3. a protective strut; 4. round steel; 5. a rotating shaft; 6. a U-shaped steel sheet; 7. an eye bolt; 8. hanging and buckling; 9. a lifting ring.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all 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.
As shown in fig. 1 to 4, the present embodiment provides an easily-revolving telescopic umbrella-shaped horizontal portal protection tool, including:
the square bottom frame is formed by connecting four first square pipes 1 end to end;
the main protection frame comprises four second square pipes 2 and square connecting rings, one ends of the four second square pipes 2 are rotatably connected with four sides of the square connecting rings respectively, one ends of the four second square pipes 2, far away from the square connecting rings, are rotatably connected with four corners of the square bottom frame respectively, and two ends of the four second square pipes 2 correspond to four corners of the square bottom frame and four sides of the square connecting rings one by one respectively;
the first square pipe 1 and the two second square pipes 2 connected with the first square pipe are encircled to form a protection side frame, a plurality of protection support rods 3 are arranged on the protection side frame, and two ends of each protection support rod 3 are detachably connected with two edges of the protection side frame respectively;
the square connecting ring is formed by connecting four round steel 4 end to end, and the second square pipe 2 is perpendicular to the round steel 4 connected with the second square pipe.
According to the invention, the square bottom frame is fixed with the periphery of the opening, the horizontal opening is covered by the main protection frame and the protection side frame, so that the safety protection of the horizontal opening is realized, wherein the square bottom frame and the main protection frame are both composed of square pipes, all parts are firmly connected, and the protection effect is good.
The first square pipe 1 and the second square pipe 2 are both telescopic steel square pipes, the size of the steel square pipe is that the outer diameter is 30mm multiplied by 30mm, the sleeve is 25mm multiplied by 25mm, and the wall thickness is 2.0mm; the longest length of the second square pipe 2 is 1.5 times of that of the first square pipe 1;
the protective supporting rod 3 is also a telescopic steel square tube, and the size of the steel square tube is that the outer diameter is 15mm multiplied by 15mm, the sleeve is 10mm multiplied by 10mm, and the wall thickness is 2.0mm;
after the protection tool is used, the second square pipe 2 and the protection support rod 3 can be shortened, and the protection tool is folded into a structure similar to a plane, so that the protection tool is convenient to store and transport; can also stretch out and draw back first side pipe 1, second side pipe 2 and protection branch 3 cooperation are flexible simultaneously, the size of adjustment square underframe to adapt to the entrance to a cave of multiple size, application scope is wide, repeatedly usable, and the turnover nature is strong.
Further, adjacent two first side pipe 1 is fixed through pivot 5, the both ends of pivot 5 respectively with its two that correspond first side pipe 1's end fixing, pivot 5 with rather than linking to each other second side pipe 2 mutually perpendicular is same root on second side pipe 2 round steel 4 with pivot 5 is parallel to each other.
Further, second side pipe 2 passes through pivot 5 with the angle of square underframe is connected, pivot 5 wears to locate its correspondence the lateral wall of 2 tip in second side pipe, and with 2 rotary types in second side pipe are connected, and the end connection of two tip and the 2 side pipe in second side pipe 1 in the 5 first side pipe of pivot through setting up is in the same place, and realize second side pipe 2 with the angle rotary type of square underframe is connected, makes second side pipe 2 can contract in a flexible way, and pivot 5 is in the same place through welded fastening with first side pipe 1, and pivot 5 all runs through two sides that second side pipe 2 tip is relative, firm in connection, and the safety protection is effectual.
Furthermore, the end part of the protection supporting rod 3 is connected with the edge of the protection side frame through a connecting piece, the connecting piece comprises a U-shaped steel sheet 6 and an eyelet bolt 7, the U-shaped steel sheet 6 is made of a stainless steel sheet with the size of 130mm multiplied by 30mm and the wall thickness of 2mm, the U-shaped steel sheet 6 is clamped on the edge of the protection side frame, a screw hole is formed in the U-shaped steel sheet 6, the eyelet bolt 7 is in threaded connection with the screw hole and used for fixing the U-shaped steel sheet 6 with the edge of the protection side frame, the end part of the protection supporting rod 3 is connected with the eyelet bolt 7 through a hanging buckle 8, when the edge of the protection side frame stretches out and draws back, the eyelet bolt 7 can be unscrewed to adjust the position of the U-shaped steel sheet 6, and then the position of the protection supporting rod 3 is adjusted, so that the size of the tool is changed to adapt to openings with different sizes; the hanging buckle 8 is a circular hanging buckle 8, an openable gap is formed in the hanging buckle 8, the gap is opened to hang the hanging ring into the eyelet of the eyelet bolt 7 (the eyelet of the eyelet bolt 7 in fig. 4 is indicated by only one circle), and then the gap of the hanging ring is closed, so that the protective supporting rod 3 can be connected with the eyelet bolt 7.
Furthermore, a hanging ring 9 is fixed on the square connecting ring, so that the main protective frame or the protective tool can be moved conveniently.
Further, the number of the second square pipes 2 is 4 to adapt to the square opening, the corresponding square bottom frame is a square bottom frame, and the square connecting rings are square connecting rings.
Further, be located same on the protection side frame protection branch 3 all parallel arrangement each other is located same on the protection side frame protection branch 3 is last at an interval 200mm sets up, avoids the staff to pass the protection side frame, protection branch 3's one end with first side pipe 1 is connected, the other end with second side pipe 2 is connected, and every all be connected with on the second side pipe 2 protection branch 3, protection branch 3 also plays the effect of strengthening the relation of connection between first side pipe 1 and second side pipe 2 when playing the guard action, through the aforesaid setting, under the condition that uses less protection branch 3, still can play better safety protection effect, and the better first side of enhancement pipe 1 of ability and the second side pipe 2 between the relation of connection, its hookup location is more even.
The embodiment also provides a horizontal portal protection method, based on the protection tool, which includes the following steps:
(1) Rechecking the maximum horizontal opening size of the floor according to the construction blueprint;
(2) Determining the sizes of the first square pipe 1 and the second square pipe 2 according to the largest horizontal opening size of a floor, so that the size of the tool is enough to completely cover the opening, the first square pipe 1 is fixed with the floor, and the distance between the first square pipe 1 and the edge of the opening is 100-200 mm;
(3) Two opposite side walls at one end of the second square pipe 2 are drilled, the drilled holes are 15mm away from the end face of the second square pipe 2, the hole diameter is 13mm, the round steel 4 is inserted, the round steel 4 is 90mm long A12 rustproof round steel 4 (the round steel 4 in the figures 1 and 2 is only indicated by one line, a square connecting ring is only indicated by one square pattern), one end of the round steel 4 enters from one hole, the other end of the round steel 4 exits, two ends of the round steel 4 are located on two sides of the second square pipe 2, and a plurality of round steels 4 are welded end to form the square connecting ring;
(4) The square connecting ring is welded with a lifting ring 9, and when the square connecting ring is a square connecting ring, two opposite corners of the lifting ring 9 and the square connecting ring are welded and fixed;
(5) Drilling a hole in the side wall of one end, far away from the round steel 4, of the second square pipe 2, wherein the hole is 13mm in diameter and 10mm away from the end face of one end, far away from the round steel 4, of the second square pipe 2, inserting the rotating shaft 5, wherein the rotating shaft 5 is an A12 round steel 4 shaft 70mm long, and two ends of the rotating shaft 5 are respectively welded with one end, corresponding to the rotating shaft, of the first square pipe 1;
(6) Will U shaped steel piece 6 card is established two edges of protection side frame, and pass through eye bolt 7 will U shaped steel piece 6 with the limit of protection side frame is fixed, utilizes hang detain 8 will protection branch 3 with eye bolt 7 is connected, hang detain 8 with through welded fastening between the protection branch 3.
Further, when the size of the horizontal hole changes in the use process, the first square pipe 1 and the second square pipe 2 can be stretched according to the size of the horizontal hole, and are fixed on the template close to the edge of the hole, so that the protection safety of the horizontal hole is ensured, and the layer N +1 can be used continuously after the construction of the layer N is finished.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides an easy turnover telescopic umbrella form horizontal entrance to a cave protection instrument which characterized in that includes:
the regular polygon bottom frame is formed by connecting a plurality of first square pipes end to end;
the main protection frame comprises at least three second square pipes and regular polygon connecting rings, the number of the sides of the regular polygon connecting rings and the number of the sides of the regular polygon bottom frame are consistent with the number of the second square pipes, one end of each of the second square pipes is rotatably connected with each side of the regular polygon connecting ring, and one end, far away from the regular polygon connecting rings, of each of the second square pipes is rotatably connected with each angle of the regular polygon bottom frame;
the first square pipe and the two second square pipes connected with the first square pipe are encircled to form a protection side frame, a plurality of protection support rods are arranged on the protection side frame, and two ends of each protection support rod are detachably connected with two edges of the protection side frame respectively;
the first square pipe and the second square pipe are telescopic square pipes; the protection supporting rod is a telescopic supporting rod;
the regular polygon connecting ring is formed by connecting a plurality of round steel end to end.
2. The easy-to-turn telescopic umbrella-shaped horizontal hole protecting tool as claimed in claim 1, wherein two adjacent first square pipes are fixed through a rotating shaft, and two ends of the rotating shaft are respectively fixed with the ends of the two corresponding first square pipes.
3. The easy-to-turn telescopic umbrella-shaped horizontal portal protection tool as claimed in claim 2, wherein the second square tube is connected to the corner of the regular polygon bottom frame through the rotation shaft, and the rotation shaft is inserted into the corresponding side wall of the end of the second square tube and rotatably connected to the second square tube.
4. The easy-to-turn telescopic umbrella-shaped horizontal hole protecting tool as claimed in claim 1, wherein the end of the protecting support rod is connected with the edge of the protecting side frame through a connecting piece, the connecting piece comprises a U-shaped steel sheet and an eyelet bolt, the U-shaped steel sheet is clamped on the edge of the protecting side frame, a screw hole is formed in the U-shaped steel sheet, the eyelet bolt is in threaded connection with the screw hole and used for fixing the U-shaped steel sheet with the edge of the protecting side frame, and the end of the protecting support rod is connected with the eyelet bolt through a hanging buckle.
5. The easy-to-turn telescopic umbrella-shaped horizontal portal protection tool as claimed in claim 1, wherein a hanging ring is fixed on the regular polygon connecting ring.
6. The easy-to-turn telescopic umbrella-shaped horizontal hole protection tool as claimed in claim 1, wherein the number of the second square pipes is 4.
7. The easy-to-turn telescopic umbrella-shaped horizontal hole protection tool as claimed in claim 1, wherein the protection struts on the same protection side frame are all arranged in parallel with each other.
8. The easy-to-turn telescopic umbrella-shaped horizontal hole protection tool as claimed in claim 1, wherein the protection struts on the same protection side frame are arranged at an interval of 200 mm.
9. The easy-to-turn telescopic umbrella-shaped horizontal tunnel portal protection tool according to claim 1, wherein one end of the protection strut is connected with the first square pipe, the other end of the protection strut is connected with the second square pipe, and each second square pipe is connected with the protection strut.
10. A method for protecting a horizontal cave entrance based on the protection tool of any one of claims 1 to 9, which is characterized by comprising the following steps:
(1) Rechecking the size of a horizontal opening of the floor;
(2) Determining the sizes of the first square pipe and the second square pipe according to the size of a horizontal opening of a floor, wherein the first square pipe is fixed with the floor, and the distance between the first square pipe and the edge of the opening is 100-200 mm;
(3) Drilling a hole in the side wall of one end of the second square pipe, inserting the round steel, and welding a plurality of round steels end to form the regular polygon connecting ring;
(4) A hanging ring is welded on the regular polygon connecting ring;
(5) Drilling a hole in the side wall of one end, far away from the round steel, of the second square pipe, inserting a rotating shaft, and welding two ends of the rotating shaft with one end of the corresponding first square pipe respectively;
(6) U shaped steel piece is established to two edges card of protection side frame, U shaped steel piece with the limit of protection side frame passes through the eye bolt fastening, protection branch with the eye bolt is through hanging the knot and connecting, hang the knot with through welded fastening between the protection branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111500489.5A CN114016758B (en) | 2021-12-09 | 2021-12-09 | Retractable umbrella-shaped horizontal hole protecting tool easy to turnover and protecting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111500489.5A CN114016758B (en) | 2021-12-09 | 2021-12-09 | Retractable umbrella-shaped horizontal hole protecting tool easy to turnover and protecting method |
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| Publication Number | Publication Date |
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| CN114016758A CN114016758A (en) | 2022-02-08 |
| CN114016758B true CN114016758B (en) | 2023-03-24 |
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2021
- 2021-12-09 CN CN202111500489.5A patent/CN114016758B/en active Active
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