CN113323426A - Protective structure for opening of construction site and construction method thereof - Google Patents
Protective structure for opening of construction site and construction method thereof Download PDFInfo
- Publication number
- CN113323426A CN113323426A CN202110652578.5A CN202110652578A CN113323426A CN 113323426 A CN113323426 A CN 113323426A CN 202110652578 A CN202110652578 A CN 202110652578A CN 113323426 A CN113323426 A CN 113323426A
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- Prior art keywords
- hole
- opening
- grooves
- construction site
- column
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
The invention relates to a protective structure of a cave entrance of a construction site and a construction method thereof, wherein the protective structure comprises the following components: the grooves are reserved in the concrete structure and are positioned on the inner wall of the hole; a plurality of fender rods with adjustable length, a plurality of fender rods cross arrangement and level keep off and locate the entrance to a cave, and the relative both ends of fender rod are located respectively and are fixed in the recess that corresponds. According to the invention, the hole protection structure is formed in the hole, so that the construction safety is ensured, and the problem of high construction difficulty of hole protection in the prior art is solved. The structure principle of protective rod is similar to the flexible principle of pressing of ballpoint, through the tip of pressing the protective rod for the protective rod shortens, conveniently locates in the hole, and continues through pressing the protective rod, makes the protective rod extension, and the tip of protective rod is fixed in locating the recess that corresponds, and the construction is simple and convenient and stable, easy to assemble and dismantlement.
Description
Technical Field
The invention relates to the field of building construction, in particular to a protective structure of a hole in a construction site and a construction method thereof.
Background
Some openings exist in a construction site, and protective structures need to be arranged so as to ensure the construction safety of an operation surface. The protection of entrance to a cave is carried out through generally reserving the reinforcing bar and laying the template among the prior art, both need guarantee entrance to a cave one shot forming, will remain the reinforcing bar again, still will satisfy the aluminium mould removable, the construction degree of difficulty is big.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a protective structure for a hole in a construction site and a construction method thereof, and solves the problem of high construction difficulty of hole protection in the prior art.
The technical scheme for realizing the purpose is as follows:
the invention provides a protective structure of a cave entrance of a construction site, which comprises:
the grooves are reserved in the concrete structure and are positioned on the inner wall of the hole;
a plurality of guard bars with adjustable length, it is a plurality of guard bar cross arrangement and level keep off locate the entrance to a cave, the relative both ends of guard bar are located respectively and are fixed in the recess that corresponds.
The protective structure for the opening of the construction site of the present invention is further improved in that,
the guard bar comprises a main section and adjusting sections which are elastically connected to the two ends of the main section;
the adjustment section includes:
the first toothed column is rotatably inserted into the main section, a spring is clamped between the first toothed column and the end part of the main section, and the first toothed column is provided with a first guide groove;
the second tooth column is matched with the first tooth column and used for pressing, a second guide groove is formed in the second tooth column, and the second tooth column is in meshed connection with the first tooth column through meshing teeth;
the main section has a guide rail adapted to the first guide groove and the second guide groove.
The further improvement of the protective structure of the opening on the construction site is that the groove comprises:
the first grooves are reserved in the concrete structure and are positioned on two first inner walls opposite to the hole;
and the second grooves are reserved in the concrete structure and are positioned on two second inner walls opposite to the hole opening, and the second inner walls are vertically connected with the first inner walls.
The protection structure of the opening on the construction site is further improved in that the protection rod comprises:
the length of each first rod is adjustable, and two ends of each first rod are arranged in the corresponding first grooves so as to be horizontally arranged at the corresponding hole in a blocking manner;
and the two ends of the second rods are arranged in the second grooves, so that the holes are horizontally blocked.
The protective structure for the opening of the construction site of the present invention is further improved in that,
the first rods are arranged at intervals up and down along the depth direction of the hole;
the second rods are arranged at intervals up and down along the depth direction of the hole.
The invention also provides a construction method of the protective structure of the opening on the construction site, which comprises the following steps:
when a concrete structure is poured, a plurality of grooves are reserved on the inner wall of the hole;
providing a plurality of guard bars with adjustable length, being a plurality of guard bars are arranged in a cross way and horizontally blocked at the hole, and the two opposite ends of the guard bars are respectively arranged in the corresponding grooves for fixing.
The protective structure for the opening of the construction site of the present invention is further improved in that,
providing a guard bar comprises providing a main section and providing two adjusting sections, wherein the two adjusting sections are elastically connected to two ends of the main section;
providing the conditioning segment includes:
providing a first toothed column and a spring, inserting the first toothed column into the main section in a rotatable manner, connecting the first toothed column to the end part of the main section through the spring, and arranging a first guide groove on the first toothed column;
providing a second tooth column which is matched with the first tooth column and is used for pressing, wherein the second tooth column is provided with a second guide groove, and the second tooth column and the first tooth column are connected in an occlusion way through occlusion teeth;
the main section has a guide rail adapted to the first guide groove and the second guide groove.
The further improvement of the protective structure of the opening on the construction site is that the reservation of a plurality of grooves comprises the following steps:
reserving a plurality of first grooves on two first inner walls opposite to the hole in the concrete structure;
and a plurality of second grooves are reserved in the concrete structure and are positioned on two second inner walls opposite to the hole opening, and the second inner walls are vertically connected with the first inner walls.
The protection structure of the opening in the construction site of the present invention is further improved in that the provision of the protection bar comprises:
providing a plurality of first rods with adjustable lengths, and arranging two ends of each first rod in the first grooves so as to horizontally block the hole;
and providing a plurality of second rods with adjustable lengths, and arranging two ends of each second rod in the second grooves so as to horizontally block the hole.
The protective structure for the opening of the construction site of the present invention is further improved in that,
arranging a plurality of first rods at intervals up and down along the depth direction of the hole;
the plurality of second rods are arranged at intervals up and down along the depth direction of the hole.
The protective structure of the opening on the construction site and the construction method thereof have the beneficial effects that:
according to the invention, the plurality of protection rods are arranged in a crossed manner and horizontally blocked at the opening, the two opposite ends of each protection rod are respectively arranged in the corresponding grooves for fixing, and an opening protection structure is formed in the opening, so that the construction safety is ensured. The problem of the construction degree of difficulty of entrance to a cave protection among the prior art is big is solved. The structure principle of protective rod is similar to the flexible principle of pressing of ballpoint, through the tip of pressing the protective rod for the protective rod shortens, conveniently locates in the hole, and continues through pressing the protective rod, makes the protective rod extension, and the tip of protective rod is fixed in locating the recess that corresponds, and the construction is simple and convenient and stable, easy to assemble and dismantlement.
Drawings
Fig. 1 is a plan view of a protective structure for an opening in a construction site according to the present invention.
Fig. 2 is a longitudinal view of the protective structure of the opening in the construction site according to the present invention.
Fig. 3 is a sectional view of a guard bar of a guard structure of an opening in a construction site according to the present invention.
Fig. 4 is an enlarged view of a portion a of fig. 3.
Fig. 5 and 6 are a front view and a side view of a first tooth post of a protective structure for an opening at a construction site according to the present invention from one perspective.
Fig. 7 and 8 are a front view and a side view of the first tooth post of the protective structure for an opening at a construction site according to the present invention from another perspective.
Fig. 9 is a schematic view of a second tooth post of the protective structure for the opening of the construction site according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, there is shown a plan view of a protective structure for an opening in a construction site according to the present invention. Fig. 2 is a longitudinal view of the protective structure of the opening in the construction site according to the present invention. Referring to fig. 1 and 2, the protective structure for the opening of the construction site of the present invention includes:
a plurality of grooves 100 reserved in the concrete structure 10 and located on the inner wall of the opening;
a plurality of protection poles 20 with adjustable length, a plurality of protection poles 20 cross arrangement and level keep off locate the entrance to a cave, and the relative both ends of protection pole 20 are located respectively and are fixed in corresponding recess 100.
As a preferred embodiment of the protective structure for the opening of the construction site of the present invention, refer to fig. 3, which is a cross-sectional view of the protective rod of the protective structure for the opening of the construction site of the present invention. Fig. 4 is an enlarged view of a portion a of fig. 3. As shown in fig. 1 to 4, the guard bar 20 includes a main section 21 and an adjusting section 30 elastically connected to both ends of the main section 21; the adjustment segment 30 includes: the first tooth column 31 is rotatably inserted in the main section 21, a spring 32 is clamped between the first tooth column 31 and the end part of the main section 21, and the first tooth column 31 is provided with a first guide groove 310; a second tooth column 33 which is adapted to the first tooth column 31 and used for pressing, wherein the second tooth column 33 is provided with a second guide groove 330, and the second tooth column 33 is in meshing connection with the first tooth column 31 through meshing teeth; the main section 21 has a guide rail 210 fitted to the first guide groove 310 and the second guide groove 330.
As a preferred embodiment of the protective structure for the opening of the construction site according to the present invention, referring to fig. 5 and 6, a front view and a side view of a first tooth post of the protective structure for the opening of the construction site according to the present invention are shown at one viewing angle. Fig. 7 and 8 are a front view and a side view of the first tooth post of the protective structure for an opening at a construction site according to the present invention from another perspective. Fig. 9 is a front view of a second tooth post of the protective structure for the opening of the construction site according to the present invention. In the present embodiment, the structure principle of the adjustment segment 30 is similar to the pressing and extending principle of a ball-point pen.
When the adjusting section 30 is in a compressed state, the second toothed column 33 moves along the guide rail 210 to press the first toothed column 31 by pressing the second toothed column 33, so that the first guide groove 310 is disengaged from the guide rail 210 and the first toothed column 31 is in a rotatable state; then the second tooth column 33 is loosened, the first tooth column 33 rotates along the meshing teeth with the second tooth column 33 under the action of the spring 32 to the first guide groove 310 arranged on the guide rail 210, and the first tooth column 31 moves along the guide rail 210 to push out the second tooth column 33;
when the adjusting section 30 is in the extended state, the spring 32 presses and fixes the second tooth post 33 by pressing the second tooth post 33 so that the first tooth post 31 rotates along the engagement teeth with the second tooth post 33 to the first guide groove 310 and is arranged on the guide rail 210, and the second tooth post 33 is prevented from being ejected.
In this embodiment, the second tooth post 33 and the first tooth post 33 are not completely engaged, and only the tooth tip is partially engaged, so that the engagement state can be changed during use.
Further, the first tooth post 31 includes a first column body, a top plate fixed to one end of the first column body, and a first engaging tooth fixed to the other end of the first column body. The top plate is connected to a spring 32. The second toothed column 33 includes a second column body and a pressing plate fixed to one end of the second column body, and the other end of the second column body is formed with an inclined surface adapted to the first engaging tooth. The second column portion is inserted into the main section 21. The pressing plate protrudes out of the main section 21. The second post body is opened with a second guide groove 330 adapted to the guide rail 210.
As a preferred embodiment of the protective structure for the opening of the construction site of the present invention, the groove 100 includes: a plurality of first grooves reserved in the concrete structure 10 and located on two first inner walls opposite to the opening; and the second grooves are reserved in the concrete structure 10 and are positioned on two second inner walls opposite to the hole opening, and the second inner walls are vertically connected with the first inner walls. In this embodiment, a rectangular opening is formed when the concrete structure 10 is cast. The shape of the hole can be determined according to actual needs. The invention is also applicable to circular openings.
As a preferred embodiment of the protection structure for the opening in the construction site of the present invention, the protection bar 20 includes: the length of the first rods is adjustable, and two ends of each first rod are arranged in the first grooves so as to be horizontally blocked at the hole; thereby the opening is located to the level fender of a plurality of second poles with adjustable length, the second inslot is located at the both ends of second pole. The first bar is perpendicular to the second bar. The first rod and the second rod are connected and fixed into an integral structure through a fastener.
As a preferred embodiment of the protective structure for the opening in the construction site of the present invention, a plurality of first bars are provided at intervals up and down along the depth direction of the opening; the plurality of second rods are arranged at intervals up and down along the depth direction of the hole.
In this embodiment, before the concrete is poured, a plurality of wooden boxes of 100mm × 100mm × 100mm are placed at the positions of the reserved grooves, and after the concrete is poured and formed, the wooden boxes are taken out to form the grooves.
In the process of installing the guard bar, the guard bar is shortened by pressing the adjusting section at the end part of the guard bar. Then, the guard bar with the shortened length being the width between the two inner walls of the hole is placed between the two opposite reserved grooves; then the adjusting section at the end part of the protective rod is pressed to extrude and release the groove, so that the end of the protective rod can extend. Then in the same way, the other end of the protection rod is extruded towards the groove position and is loosened to extend the end of the protection rod, and then the two ends of the protection rod are correspondingly arranged in the groove to be fixed.
The invention also provides a construction method of the protective structure of the opening on the construction site, which comprises the following steps:
when the concrete structure 10 is poured, a plurality of grooves 100 are reserved on the inner wall of the hole;
provide a plurality of protective rod 20 of adjustable length, locate the entrance to a cave with a plurality of protective rod 20 cross arrangement and level fender, locate respectively corresponding recess with the relative both ends of protective rod 20 and fix.
As a preferred embodiment of the construction method of the protective structure of the opening in the construction site of the present invention, providing the guard bar 20 comprises providing a main section 21 and providing two adjusting sections 30, elastically connecting the two adjusting sections to both ends of the main section 21; providing the conditioning segment 30 includes: providing a first toothed column 31 and a spring 32, rotatably inserting the first toothed column 31 into the main section 21, connecting the first toothed column 31 to the end of the main section 21 through the spring 32, wherein the first toothed column 31 is provided with a first guide groove 310; providing a second tooth column 33 which is matched with the first tooth column 31 and is used for pressing, wherein the second tooth column 33 is provided with a second guide groove 330, and the second tooth column 33 and the first tooth column 31 are connected in a meshing way through meshing teeth; the main section 21 has a guide rail 210 fitted to the first guide groove 310 and the second guide groove 330.
As a preferred embodiment of the construction method of the protective structure for the opening in the construction site of the present invention, the reserving of the plurality of grooves 100 includes: reserving a plurality of first grooves on two first inner walls opposite to the hole in the concrete structure 10; a plurality of second grooves are reserved in the concrete structure 10 on two second inner walls opposite to the opening, and the second inner walls are vertically connected with the first inner walls.
As a preferred embodiment of the method for constructing a protective structure for an opening in a construction site according to the present invention, the provision of the guard bar 20 includes: providing a plurality of first rods with adjustable lengths, and arranging two ends of each first rod in the first grooves so as to horizontally block the holes; and providing a plurality of second rods with adjustable lengths, and arranging two ends of the second rods in the second grooves so as to horizontally block the holes.
As a preferred embodiment of the construction method of the protective structure for the opening in the construction site of the present invention, a plurality of first bars are provided at intervals up and down along the depth direction of the opening; the plurality of second rods are arranged at intervals up and down along the depth direction of the hole.
The protective structure of the opening on the construction site and the construction method thereof have the beneficial effects that:
according to the invention, the plurality of protection rods are arranged in a crossed manner and horizontally blocked at the opening, the two opposite ends of each protection rod are respectively arranged in the corresponding grooves for fixing, and an opening protection structure is formed in the opening, so that the construction safety is ensured. The problem of the construction degree of difficulty of entrance to a cave protection among the prior art is big is solved. The structure principle of protective rod is similar to the flexible principle of pressing of ballpoint, through the tip of pressing the protective rod for the protective rod shortens, conveniently locates in the hole, and continues through pressing the protective rod, makes the protective rod extension, and the tip of protective rod is fixed in locating the recess that corresponds, and the construction is simple and convenient and stable, easy to assemble and dismantlement.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (10)
1. A protective structure for an opening in a construction site, comprising:
the grooves are reserved in the concrete structure and are positioned on the inner wall of the hole;
a plurality of guard bars with adjustable length, it is a plurality of guard bar cross arrangement and level keep off locate the entrance to a cave, the relative both ends of guard bar are located respectively and are fixed in the recess that corresponds.
2. The opening protection structure in construction site according to claim 1,
the guard bar comprises a main section and adjusting sections which are elastically connected to the two ends of the main section;
the adjustment section includes:
the first toothed column is rotatably inserted into the main section, a spring is clamped between the first toothed column and the end part of the main section, and the first toothed column is provided with a first guide groove;
the second tooth column is matched with the first tooth column and used for pressing, a second guide groove is formed in the second tooth column, and the second tooth column is in meshed connection with the first tooth column through meshing teeth;
the main section has a guide rail adapted to the first guide groove and the second guide groove.
3. The structure for protecting an opening in a construction site of claim 1, wherein the groove comprises:
the first grooves are reserved in the concrete structure and are positioned on two first inner walls opposite to the hole;
and the second grooves are reserved in the concrete structure and are positioned on two second inner walls opposite to the hole opening, and the second inner walls are vertically connected with the first inner walls.
4. The structure for protecting an opening in a construction site of claim 3, wherein the guard bar comprises:
the length of each first rod is adjustable, and two ends of each first rod are arranged in the corresponding first grooves so as to be horizontally arranged at the corresponding hole in a blocking manner;
and the two ends of the second rods are arranged in the second grooves, so that the holes are horizontally blocked.
5. The opening protection structure in construction site according to claim 4,
the first rods are arranged at intervals up and down along the depth direction of the hole;
the second rods are arranged at intervals up and down along the depth direction of the hole.
6. A construction method of a protective structure of a hole in a construction site is characterized by comprising the following steps:
when a concrete structure is poured, a plurality of grooves are reserved on the inner wall of the hole;
providing a plurality of guard bars with adjustable length, being a plurality of guard bars are arranged in a cross way and horizontally blocked at the hole, and the two opposite ends of the guard bars are respectively arranged in the corresponding grooves for fixing.
7. The method of constructing a protective structure for an opening at a construction site according to claim 6,
providing a guard bar comprises providing a main section and providing two adjusting sections, wherein the two adjusting sections are elastically connected to two ends of the main section;
providing the conditioning segment includes:
providing a first toothed column and a spring, inserting the first toothed column into the main section in a rotatable manner, connecting the first toothed column to the end part of the main section through the spring, and arranging a first guide groove on the first toothed column;
providing a second tooth column which is matched with the first tooth column and is used for pressing, wherein the second tooth column is provided with a second guide groove, and the second tooth column and the first tooth column are connected in an occlusion way through occlusion teeth;
the main section has a guide rail adapted to the first guide groove and the second guide groove.
8. The method of constructing a protective structure for an opening at a construction site according to claim 6,
reserving a plurality of grooves includes:
reserving a plurality of first grooves on two first inner walls opposite to the hole in the concrete structure;
and a plurality of second grooves are reserved in the concrete structure and are positioned on two second inner walls opposite to the hole opening, and the second inner walls are vertically connected with the first inner walls.
9. The method of constructing a protective structure for an opening at a construction site according to claim 8,
providing a guard bar includes:
providing a plurality of first rods with adjustable lengths, and arranging two ends of each first rod in the first grooves so as to horizontally block the hole;
and providing a plurality of second rods with adjustable lengths, and arranging two ends of each second rod in the second grooves so as to horizontally block the hole.
10. The method of constructing a protective structure for an opening at a construction site according to claim 9,
arranging a plurality of first rods at intervals up and down along the depth direction of the hole;
the plurality of second rods are arranged at intervals up and down along the depth direction of the hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110652578.5A CN113323426B (en) | 2021-06-11 | 2021-06-11 | Protection structure of hole on construction site and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110652578.5A CN113323426B (en) | 2021-06-11 | 2021-06-11 | Protection structure of hole on construction site and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113323426A true CN113323426A (en) | 2021-08-31 |
| CN113323426B CN113323426B (en) | 2023-05-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110652578.5A Active CN113323426B (en) | 2021-06-11 | 2021-06-11 | Protection structure of hole on construction site and construction method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN113323426B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08120676A (en) * | 1994-10-21 | 1996-05-14 | Masaaki Mizuta | Earth retaining timbering detaching method and device therefor |
| CN203514839U (en) * | 2013-10-08 | 2014-04-02 | 江苏省建工集团有限公司 | Expansion supporting rod |
| CN203905425U (en) * | 2014-06-20 | 2014-10-29 | 中建五局第三建设有限公司 | Elevator shaft construction tool type operation platform and safety protection integrated structure |
| CN205077884U (en) * | 2015-08-14 | 2016-03-09 | 中国建筑第八工程局有限公司 | Horizontal entrance to a cave protective cover plate bracket device |
| CN207398455U (en) * | 2017-11-07 | 2018-05-22 | 长春大学 | Push type stretches socket |
| CN212478503U (en) * | 2020-06-08 | 2021-02-05 | 宋鑫 | Elevator shaft construction operation platform |
| CN212802649U (en) * | 2020-03-17 | 2021-03-26 | 中国建筑第五工程局有限公司 | Simple tool for rapidly protecting hole |
| CN212945017U (en) * | 2020-07-10 | 2021-04-13 | 东岳精密工业(大连)有限公司 | Guide pillar assembly |
-
2021
- 2021-06-11 CN CN202110652578.5A patent/CN113323426B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08120676A (en) * | 1994-10-21 | 1996-05-14 | Masaaki Mizuta | Earth retaining timbering detaching method and device therefor |
| CN203514839U (en) * | 2013-10-08 | 2014-04-02 | 江苏省建工集团有限公司 | Expansion supporting rod |
| CN203905425U (en) * | 2014-06-20 | 2014-10-29 | 中建五局第三建设有限公司 | Elevator shaft construction tool type operation platform and safety protection integrated structure |
| CN205077884U (en) * | 2015-08-14 | 2016-03-09 | 中国建筑第八工程局有限公司 | Horizontal entrance to a cave protective cover plate bracket device |
| CN207398455U (en) * | 2017-11-07 | 2018-05-22 | 长春大学 | Push type stretches socket |
| CN212802649U (en) * | 2020-03-17 | 2021-03-26 | 中国建筑第五工程局有限公司 | Simple tool for rapidly protecting hole |
| CN212478503U (en) * | 2020-06-08 | 2021-02-05 | 宋鑫 | Elevator shaft construction operation platform |
| CN212945017U (en) * | 2020-07-10 | 2021-04-13 | 东岳精密工业(大连)有限公司 | Guide pillar assembly |
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| Publication number | Publication date |
|---|---|
| CN113323426B (en) | 2023-05-09 |
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