CN113958125A - Pore-forming device and pore-forming method for prestressed steel beam preformed hole - Google Patents
Pore-forming device and pore-forming method for prestressed steel beam preformed hole Download PDFInfo
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- CN113958125A CN113958125A CN202111324441.3A CN202111324441A CN113958125A CN 113958125 A CN113958125 A CN 113958125A CN 202111324441 A CN202111324441 A CN 202111324441A CN 113958125 A CN113958125 A CN 113958125A
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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
- E04G15/00—Forms or shutterings for making openings, cavities, slits, or channels
- E04G15/04—Cores for anchor holes or the like around anchors embedded in the concrete
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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
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
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Abstract
The application relates to a pore-forming device and pore-forming method of prestressing force steel beam preformed hole relates to concrete engineering construction technical field for the concrete structure of steel form, the pore-forming device contains: the steel main beam is horizontally arranged above the steel formwork, two ends of the steel main beam are respectively and fixedly provided with a steel cross beam, and the bottom surface of the steel cross beam is propped against the top surface of the steel formwork; the top end of the steel cylinder is vertically fixed on the steel main beam, and the bottom end surface of the steel cylinder is closed; the steel cylinder is circumferentially wound with a spiral rubber strip and inserted into the concrete structure to form a pre-stressed steel beam preformed hole. The pore-forming device and the pore-forming method can simply and efficiently realize the forming of the prestressed steel beam preformed hole with large diameter and long depth.
Description
Technical Field
The application relates to the technical field of concrete engineering construction, in particular to a pore-forming device and a pore-forming method for a prestressed steel beam preformed hole.
Background
At present, in the building construction process, various reserved holes and notches in concrete engineering are commonly used, and the hole forming method has various modes, such as various hole forming methods of customized wood pattern forming, steel pipe embedding forming, PVC pipe embedding forming, corrugated pipe embedding forming, top-pulled pipe mounting forming and the like.
Specifically, the customized wood pattern is long in molding time, more in wood and inconvenient to operate; the embedded steel pipe is formed with large investment at one time; the PVC pipe is embedded and formed, and the PVC pipe is required to be chiseled for a preformed hole with special requirements, so that the operation is difficult and complicated; the embedded corrugated pipe is formed and is mainly used for a prestressed duct, and the applicable duct is smaller; the installation and the forming of the top-drawing pipe have higher requirements on the construction process and great difficulty in quality control.
In a concrete structure, a preformed hole suitable for a prestressed steel strand bundle (prestressed steel strand for short) is reserved, the preformed hole of the prestressed steel strand bundle is required to be a straight hole with a large diameter and a deep depth, and in order to ensure that the pulling resistance of the anchored steel strand bundle meets the requirement, a shear notch needs to be arranged on the hole wall, but the requirement is difficult to meet by adopting a conventional hole forming method.
Disclosure of Invention
The application provides a pore-forming device and a pore-forming method for a prestressed steel beam preformed hole, which can simply and efficiently realize the forming of the prestressed steel beam preformed hole with large diameter and long depth.
The application provides a pore-forming device of prestressing force steel beam preformed hole for the concrete structure of steel form, pore-forming device contains: the steel main beam is horizontally arranged above the steel formwork, two ends of the steel main beam are respectively and fixedly provided with a steel cross beam, and the bottom surface of the steel cross beam is propped against the top surface of the steel formwork; the top end of the steel cylinder is vertically fixed on the steel main beam, and the bottom end surface of the steel cylinder is closed; the steel cylinder is circumferentially wound with a spiral rubber strip and is inserted into the concrete structure to form a prestressed steel beam preformed hole;
the pore-forming device also comprises a plurality of shoveling cushion blocks for leveling the steel main beam, and the shoveling cushion blocks are arranged between the bottom surface of the steel beam and the top surface of the steel template; the top surface of the steel beam is fixed on the lower surface of the steel main beam through bolts, the bottom surface of the steel beam is fixed on the steel formwork through bolts at intervals, and the shoveling cushion block is filled between the bottom surface of the steel beam and the gap of the top surface of the steel formwork.
In some embodiments, a closed-cell foamed polyethylene plate for facilitating steel cylinder hole removal is arranged between the steel cylinder and the rubber strip; the surface of the steel cylinder is coated with a grease isolating agent, and the outer surface of the closed-cell foamed polyethylene plate is coated with a concrete release agent.
In some embodiments, the hole forming device further comprises a jack and a bracket, the jack is placed on the top surface of the concrete structure, the bracket is arranged at the top end of the jack, and the top surface of the bracket is attached to the lower surface of the steel main beam; the jack and the bracket are arranged in the circumferential direction of the steel cylinder.
The application also discloses a pore-forming method of the pore-forming device based on the prestressed steel beam preformed hole, which comprises the following steps:
s1: respectively fixedly arranging a steel beam at two ends of a steel main beam, and vertically fixing the top end of a steel cylinder to the steel main beam;
s2: winding a spiral rubber strip on the circumferential direction of the steel cylinder;
s3: hoisting the pore-forming device above the steel template, and abutting the bottom surfaces of the two steel cross beams against the top surface of the steel template; adjusting the positions of the steel beam and the steel girder, and controlling the steel cylinder to reach an ideal position in the steel template;
s4: pouring concrete into the steel template, and integrally removing the steel main beam, the steel cross beam and the steel cylinder when the strength of the concrete reaches a set value;
s5: and taking out the rubber strip remained in the pre-stressed steel beam preformed hole to finish the construction of the pre-stressed steel beam preformed hole.
In some embodiments, in step S1, a plurality of dip pad blocks are further disposed between the bottom surface of the steel beam and the top surface of the steel form; and after the elevation and the verticality of the steel cylinder are adjusted through the plurality of shoveling cushion blocks, the steel beam, the shoveling cushion blocks and the steel template are fixed.
In some embodiments, in step S1, the outer surface of the steel cylinder is provided with a closed cell foamed polyethylene sheet; coating a grease release agent on the surface of the steel cylinder, and coating a concrete release agent on the outer surface of the closed-cell foamed polyethylene plate; in step S2, a spiral rubber strip is wound around the outer periphery of the closed-cell foamed polyethylene sheet; in step S5, the closed-cell foamed polyethylene sheet is taken out and the rubber strip is pulled out.
In some embodiments, in step S4, a jack is placed on the top surface of the concrete structure with the strength reaching a set value, a bracket is arranged at the top end of the jack, and the top surface of the bracket is attached to the lower surface of the steel main beam; and jacking the steel main beam by using a jack through a bracket to loosen the steel cylinder, and hoisting the steel main beam, the steel cross beam and the steel cylinder integrally.
The beneficial effect that technical scheme that this application provided brought includes:
the embodiment of the application provides a pore-forming device and a pore-forming method for a prestressed steel beam preformed hole, wherein the pore-forming device comprises a steel main beam, a steel cross beam and a steel cylinder, the steel main beam is horizontally arranged above a steel template, two ends of the steel main beam are respectively and fixedly provided with the steel cross beam, the bottom surface of the steel cross beam is propped against the top surface of the steel template, the steel main beam and the steel cross beam form a suspension bracket, the top end of the steel cylinder is vertically fixed on the steel main beam, the bottom end of the steel cylinder is closed, and a spiral rubber strip is wound on the circumference of the steel cylinder; the steel cylinder of taking the rubber strip stretches into the steel form from the steel form top in, when pouring into concrete structure, forms prestressing steel beam preformed hole, the pore-forming device of prestressing steel beam preformed hole of this application simple structure, the preparation is convenient, and prestressing steel beam preformed hole shaping is high-efficient, has solved conventional hole shaping and has been difficult to realize major diameter, the fashioned technical problem of prestressing steel beam preformed hole of the long degree of depth.
Drawings
Fig. 1 is a schematic view of a pore-forming apparatus provided in an embodiment of the present application.
Fig. 2 is a view from a in fig. 1.
Fig. 3 is a cross-sectional view of B-B in fig. 1.
Reference numerals: 1. a steel cylinder; 2. a transition plate; 3. a rubber strip; 4. a concrete structure; 5. a steel form; 6. a steel main beam; 7. a steel beam; 8. cushion blocks are padded; 9. a bracket; 10. a jack; 11. and connecting the bolts.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but 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 application.
As shown in fig. 1, the present application discloses an embodiment of a pore-forming device for a prestressed steel strand preformed hole, which is used in a concrete structure 4 of a steel form 5, and the pore-forming device is arranged in the steel form 5 in advance to cast the concrete structure 4, so as to complete the formation of the prestressed steel strand preformed hole in the concrete structure 4. Wherein the steel form 5 is vertically arranged and the concrete structure 4 is poured from top to bottom. The pore-forming device comprises a steel girder 6 and a steel cylinder 1, wherein the steel girder 6 is horizontally arranged above the steel template 5, two ends of the steel girder 6 are respectively and fixedly provided with a steel beam 7, and the bottom surface of the steel beam 7 is propped against the top surface of the steel template 5. The steel main beams 6 and the steel cross beams 7 form a suspension structure arranged above the steel form 5. The top end of the steel cylinder 1 is vertically fixed on a steel girder 6 and extends into the steel template 5 from the lower surface of the steel girder 6; the bottom end face of the steel cylinder 1 is closed, so that concrete is prevented from entering the steel cylinder 1 when the concrete is poured. The steel cylinder 1 is circumferentially wound with a spiral rubber strip 3 and inserted into the concrete structure 4 to form a pre-stressed steel beam preformed hole. The rubber strips 3 are removed after the poured concrete structure 4 is formed, so that a shear notch is formed, and the requirement of the pulling resistance of the prestressed steel strand bundle can be met.
In one embodiment, the pore-forming device further comprises a plurality of shoveling cushion blocks 8 for leveling the steel main beam 6, and the plurality of shoveling cushion blocks 8 are arranged between the bottom surface of the steel beam 7 and the top surface of the steel template 5.
In the actual construction process, the steel main beam 6 crosses and is arranged above the steel template 5 through the steel cross beam 7, but the height and the verticality of the steel main beam 6 cannot always meet the design requirements, and the copying cushion block 8 is required to be used for adjustment. Specifically, the landing pad block 8 is composed of a plurality of landing pad steel plates, and the height of the landing pad block 8 is adjusted by increasing or decreasing the number of the landing pad steel plates.
In one embodiment, the top surface of the steel beam 7 is fixed on the lower surface of the steel main beam 6 through bolts, the bottom surface of the steel beam 7 is fixed on the steel template 5 through bolts at intervals, the shoveling cushion block 8 is filled between the gap between the bottom surface of the steel beam 7 and the top surface of the steel template 5, and the screwing length of the bolts is changed by changing the height of the shoveling cushion block 8.
In one embodiment, a transition plate 2 for facilitating the hole removal of the steel cylinder 1 is arranged between the steel cylinder 1 and the rubber strip 3, and the use of the transition plate 2 can facilitate the hole removal of the steel cylinder 1 after the concrete structure 4 is solidified.
As shown in fig. 3, further, the transition plate 2 is a closed-cell expanded polyethylene plate. The closed-cell foamed polyethylene plate has high compressibility, and the steel cylinder 1 can be more conveniently separated after the concrete structure 4 is solidified. Preferably, the closed cell foamed polyethylene sheet has a thickness of 20 mm.
Further, the surface of the steel cylinder 1 is coated with a grease type release agent, and the outer surface of the transition plate 2 is coated with a concrete release agent, namely the surface of the closed-cell foamed polyethylene plate is coated with the concrete release agent. The surface of the steel cylinder 1 is coated with the grease isolating agent, so that the steel cylinder 1 is favorably separated from the closed-cell foamed polyethylene plate; the concrete release agent on the surface of the closed-cell foamed polyethylene plate is beneficial to the separation of the closed-cell foamed polyethylene plate and the concrete structure 4 formed by pouring.
As shown in fig. 2, in one embodiment, the steel main beams 6 and the steel cross beams 7 are made of i-steel, the webs of the steel main beams 6 and the steel cross beams 7 are vertical, and the steel main beams 6 are perpendicular to the steel cross beams 7. The steel beam 7 is arranged along the top edge of the steel form 5.
Preferably, the pitch of the spiral line of the rubber strip 3 is kept constant, so that the shearing notches of the pre-stressed steel beam preformed hole after the concrete structure 4 is formed are more uniform.
In one embodiment, the hole forming device further comprises a jack 10 and a bracket 9, both of which are used for placing the jack 10 on the top surface of the formed concrete structure 4 after the concrete structure 4 is cast, the bracket 9 is arranged on the top end of the jack 10, and the top surface of the bracket 9 is attached to the lower surface of the steel girder 6. The jack 10 pushes the steel main beam 6 through the bracket 9, and the steel main beam 6 drives the steel cylinder 1 to move upwards, so that the steel cylinder 1 is loosened. After the steel cylinder 1 is loosened, hoisting the steel main beam 6, the steel cross beam 7 and the steel cylinder 1 integrally by using other hoisting equipment; the damage to the pre-stressed steel beam reserved hole due to the direct use of hoisting equipment is avoided.
Preferably, the jacks 10 and the brackets 9 are arranged in the circumferential direction of the steel cylinder 1. Preferably, the jacks 10 and the brackets 9 are symmetrically arranged in pairs in the circumferential direction of the steel cylinder 1, and the arrangement can provide more lifting force for the steel cylinder 1.
The application also discloses a pore-forming method of the pore-forming device based on the prestressed steel beam preformed hole, which comprises the following steps:
s1: the two ends of the steel main beam 6 are respectively fixedly provided with a steel cross beam 7, the top end of the steel cylinder 1 is vertically fixed on the steel main beam 6, and the bottom end of the steel cylinder 1 extends downwards.
S2: a spiral rubber strip 3 is wound around the steel cylinder 1.
S3: hoisting the pore-forming device (comprising a steel main beam 6, a steel cross beam 7, a steel cylinder 1 and a rubber strip 3) to the upper part of the steel template 5, wherein the bottom surfaces of the two steel cross beams 7 are respectively propped against the top surface of the steel template 5, the steel cylinder 1 extends into the steel template 5 from the steel main beam 6, the positions of the steel cross beam 7 and the steel main beam 6 are adjusted, and the steel cylinder 1 is controlled to reach an ideal position in the steel template 5. Specifically, the ideal position is generally located at the midpoint of the steel form 5.
S4: pouring concrete into the steel template 5, forming a concrete structure 4 when the strength of the concrete reaches a set value, and integrally removing the steel main beam 6, the steel cross beam 7 and the steel cylinder 1; the steel cylinder 1 is withdrawn from above the concrete structure 4.
S5: and taking out the rubber strip 3 remained in the pre-stressed steel beam preformed hole to finish the construction of the pre-stressed steel beam preformed hole. The prestressed steel bundle preformed hole is provided with the shear grooves, so that the large-diameter and long-depth prestressed steel bundle preformed hole is simply and efficiently formed.
Further, in step S1, a plurality of dip pad blocks 8 are further disposed between the bottom surface of the steel beam 7 and the top surface of the steel form 5; after the elevation and the verticality of the steel cylinder 1 are adjusted through a plurality of shoveling cushion blocks 8, the steel beam 7, the shoveling cushion blocks 8 and the steel template 5 are fixed; the elevation and the verticality of the steel cylinder 1 are more accurate by the landing pad cushion block 8.
Further, in step S1, a closed-cell foamed polyethylene plate is further disposed on the outer surface of the steel cylinder 1; and coating a grease release agent on the surface of the steel cylinder 1, and coating a concrete release agent on the outer surface of the closed-cell foamed polyethylene plate. The closed-cell foamed polyethylene plate with high compressibility still has certain deformation capacity due to the fact that the hardness of the closed-cell foamed polyethylene plate is far less than that of steel materials, and therefore the steel cylinder 1 can be separated from the concrete structure 4 more easily. Meanwhile, the surface of the steel cylinder 1 is coated with the grease isolating agent, so that the steel cylinder 1 is favorably separated from the closed-cell foamed polyethylene plate; the concrete release agent on the surface of the closed-cell foamed polyethylene plate is beneficial to the separation of the closed-cell foamed polyethylene plate and the concrete structure 4 formed by pouring.
In step S2, a spiral rubber strip 3 is wound around the outer circumference of the closed-cell foamed polyethylene sheet. In step S5, the closed-cell foamed polyethylene sheet is first taken out, and the rubber strip 3 is pulled out. After the steel cylinder 1 is taken out, the closed-cell foamed polyethylene plate coated with the concrete release agent is easily taken out, and after the closed-cell foamed polyethylene plate is taken out, workers enter the pre-stressed steel beam preformed holes and can easily take out the rubber strips 3. The closed-cell foamed polyethylene plate and the rubber strip 3 can improve the construction efficiency of the prestressed steel beam preformed hole.
Further, in step S4, a jack 10 is placed on the top surface of the concrete structure 4 with the strength reaching the set value, a bracket 9 is arranged at the top end of the jack 10, and the top surface of the bracket 9 is attached to the lower surface of the steel main beam 6; and jacking the steel main beam 6 by using a jack 10 through a bracket 9 to loosen the steel cylinder 1, and then hoisting the steel main beam 6, the steel cross beam 7 and the steel cylinder 1 integrally.
Further, in step S4, the concrete should be poured uniformly in horizontal layers, and the steel cylinder 1 should not be hit during the vibrating process when the concrete is poured, so as to prevent the steel cylinder 1 from deviating and damaging the closed-cell foamed polyethylene board.
According to the pore-forming device and the pore-forming method, the pore-forming device comprises a steel main beam 6, a steel cross beam 7 and a steel cylinder 1, wherein the steel main beam 6 and the steel cross beam 7 form a suspension bracket, the top end of the steel cylinder 1 is vertically fixed on the steel main beam 6, the bottom end of the steel cylinder is closed, and a spiral rubber strip 3 is wound on the circumference of the steel cylinder 1; the steel cylinder 1 with the rubber strip 3 extends into the steel template 5 from the upper part of the steel template 5, and when a concrete structure 4 is poured, a prestressed steel beam preformed hole with a shear groove is formed; the hole forming device for the prestress steel beam preformed hole is simple in structure and convenient to manufacture; the hole forming method has the advantages that the prestressed steel beam preformed hole is formed efficiently, the technical problem that the conventional hole forming method is difficult to realize the large-diameter and long-depth prestressed steel beam preformed hole forming is solved, and the application range is wide.
Claims (7)
1. A hole-forming device for a pre-stressed steel strand preformed hole, which is used for a concrete structure (4) of a steel template (5), and is characterized in that the hole-forming device comprises: the steel beam (6) is horizontally arranged above the steel formwork (5), two ends of the steel beam (6) are respectively and fixedly provided with a steel cross beam (7), and the bottom surface of the steel cross beam (7) is propped against the top surface of the steel formwork (5); the top end of the steel cylinder (1) is vertically fixed on the steel main beam (6), and the bottom end surface of the steel cylinder is closed; the steel cylinder (1) is circumferentially wound with a spiral rubber strip (3) and inserted into the concrete structure (4) to form a prestressed steel beam preformed hole;
the pore-forming device also comprises a plurality of shoveling cushion blocks (8) for leveling the steel main beam (6), wherein the shoveling cushion blocks (8) are arranged between the bottom surface of the steel beam (7) and the top surface of the steel template (5); the top surface of the steel beam (7) is fixed on the lower surface of the steel main beam (6) through bolts, the bottom surface of the steel beam (7) is fixed on the steel formwork (5) through bolts at intervals, and the shoveling cushion block (8) is filled between the bottom surface of the steel beam (7) and the gap of the top surface of the steel formwork (5).
2. The hole-forming device for the prestressed steel beam preformed hole as claimed in claim 1, wherein: a closed-cell foamed polyethylene plate convenient for the steel cylinder (1) to be subjected to hole removal is arranged between the steel cylinder (1) and the rubber strip (3); the surface of the steel cylinder (1) is coated with a grease isolating agent, and the outer surface of the closed-cell foamed polyethylene plate is coated with a concrete release agent.
3. The hole-forming device for the prestressed steel beam preformed hole as claimed in claim 1, wherein: the hole forming device further comprises a jack (10) and a bracket (9), the jack (10) is placed on the top surface of the concrete structure (4), the bracket (9) is arranged at the top end of the jack (10), and the top surface of the bracket (9) is attached to the lower surface of the steel main beam (6); the jack (10) and the bracket (9) are arranged in the circumferential direction of the steel cylinder (1).
4. A hole forming method of a hole forming device based on the prestress steel beam preformed hole of claim 1 is characterized by comprising the following steps:
s1: two ends of a steel main beam (6) are respectively fixedly provided with a steel cross beam (7), and the top end of a steel cylinder (1) is vertically fixed on the steel main beam (6);
s2: a spiral rubber strip (3) is wound on the steel cylinder (1) in the circumferential direction;
s3: hoisting the pore-forming device above the steel template (5), wherein the bottom surfaces of the two steel cross beams (7) are propped against the top surface of the steel template (5); adjusting the positions of the steel cross beam (7) and the steel main beam (6) to control the steel cylinder (1) to reach an ideal position in the steel template (5);
s4: pouring concrete into the steel formwork (5), and integrally removing the steel main beam (6), the steel cross beam (7) and the steel cylinder (1) when the strength of the concrete reaches a set value;
s5: and taking out the rubber strip (3) remained in the pre-stressed steel beam preformed hole to finish the construction of the pre-stressed steel beam preformed hole.
5. The hole-forming method according to claim 4, characterized in that in step S1, a plurality of dummy pad blocks (8) are further arranged between the bottom surface of the steel beam (7) and the top surface of the steel template (5); after the elevation and the verticality of the steel cylinder (1) are adjusted through the plurality of shoveling cushion blocks (8), the steel beam (7), the shoveling cushion blocks (8) and the steel template (5) are fixed.
6. The method of forming a hole of claim 4, wherein:
in step S1, a closed-cell foamed polyethylene plate is arranged on the outer surface of the steel cylinder (1); coating a grease release agent on the surface of the steel cylinder (1), and coating a concrete release agent on the outer surface of the closed-cell foamed polyethylene plate;
in step S2, a spiral rubber strip (3) is wound around the outer periphery of the closed-cell foamed polyethylene sheet;
in step S5, the closed-cell foamed polyethylene sheet is taken out and the rubber strip (3) is pulled out.
7. The hole forming method according to claim 4, characterized in that in step S4, a jack (10) is placed on the top surface of the concrete structure (4) with the strength reaching a set value, a bracket (9) is arranged at the top end of the jack (10), and the top surface of the bracket (9) is attached to the lower surface of the steel main beam (6); jacking the steel main beam (6) by a jack (10) through a bracket (9) to loosen the steel cylinder (1), and hoisting the steel main beam (6), the steel cross beam (7) and the steel cylinder (1) integrally.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011552058.9A CN112627518A (en) | 2020-12-24 | 2020-12-24 | Pore-forming device and pore-forming method for prestressed steel beam preformed hole |
| CN2020115520589 | 2020-12-24 |
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| CN113958125A true CN113958125A (en) | 2022-01-21 |
| CN113958125B CN113958125B (en) | 2022-09-30 |
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| CN202011552058.9A Withdrawn CN112627518A (en) | 2020-12-24 | 2020-12-24 | Pore-forming device and pore-forming method for prestressed steel beam preformed hole |
| CN202111324441.3A Active CN113958125B (en) | 2020-12-24 | 2021-11-10 | Pore-forming device and pore-forming method for prestressed steel beam preformed hole |
| CN202122738620.3U Expired - Fee Related CN216893504U (en) | 2020-12-24 | 2021-11-10 | Pore-forming device of prestressing force steel beam preformed hole |
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| CN111236641A (en) * | 2020-01-17 | 2020-06-05 | 江苏省苏中建设集团股份有限公司 | Aluminum alloy template top plate water supply and drainage reserved hole die and construction method thereof |
| JP6792917B1 (en) * | 2020-02-27 | 2020-12-02 | 澤野 晴美 | Void tube |
| CN216893504U (en) * | 2020-12-24 | 2022-07-05 | 中铁大桥局集团第六工程有限公司 | Pore-forming device of prestressing force steel beam preformed hole |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112627518A (en) | 2021-04-09 |
| CN216893504U (en) | 2022-07-05 |
| CN113958125B (en) | 2022-09-30 |
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