CN113958125A - A hole-forming device and hole-forming method for reserved holes in prestressed steel bundles - Google Patents
A hole-forming device and hole-forming method for reserved holes in prestressed steel bundles 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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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 310
- 239000010959 steel Substances 0.000 title claims abstract description 310
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000009415 formwork Methods 0.000 claims abstract description 18
- 238000010276 construction Methods 0.000 claims abstract description 8
- 239000004698 Polyethylene Substances 0.000 claims description 32
- -1 polyethylene Polymers 0.000 claims description 32
- 229920000573 polyethylene Polymers 0.000 claims description 32
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- 239000004519 grease Substances 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims 2
- 230000007704 transition Effects 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- 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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- Architecture (AREA)
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
本申请涉及一种预应力钢束预留孔的成孔装置及成孔方法，涉及混凝土工程施工技术领域，用于钢模板的混凝土结构，所述成孔装置包含：钢主梁，其水平设置于所述钢模板上方，所述钢主梁的两端分别固定设置一根钢横梁，所述钢横梁的底面抵持在所述钢模板的顶面；钢筒，其顶端垂直固定于所述钢主梁，其底端面封闭；所述钢筒周向缠绕螺旋状的橡胶条，并插入所述混凝土结构内形成预应力钢束预留孔。本申请的成孔装置和成孔方法，能够简单高效实现大直径、长深度的预应力钢束预留孔的成型。
The present application relates to a hole-forming device and a hole-forming method for reserved holes for prestressed steel bundles, and relates to the technical field of concrete engineering construction, and is used for concrete structures of steel formwork. The hole-forming device comprises: a steel main beam, which is arranged horizontally Above the steel formwork, two ends of the steel main beam are respectively fixed with a steel beam, and the bottom surface of the steel beam is pressed against the top surface of the steel formwork; the top of the steel cylinder is vertically fixed to the The bottom end face of the steel main beam is closed; the steel cylinder is circumferentially wound with helical rubber strips, and inserted into the concrete structure to form reserved holes for prestressed steel bundles. The hole forming device and the hole forming method of the present application can simply and efficiently realize the forming of the reserved holes for the prestressed steel bundles 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)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020115520589 | 2020-12-24 | ||
| CN202011552058.9A CN112627518A (en) | 2020-12-24 | 2020-12-24 | Pore-forming device and pore-forming method for prestressed steel beam preformed hole |
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| Publication Number | Publication Date |
|---|---|
| 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 Expired - Fee Related 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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| CN202011552058.9A Withdrawn CN112627518A (en) | 2020-12-24 | 2020-12-24 | Pore-forming device and pore-forming method for prestressed steel beam preformed hole |
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| 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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| CN112627518A (en) * | 2020-12-24 | 2021-04-09 | 中铁大桥局集团第六工程有限公司 | Pore-forming device and pore-forming method for prestressed steel beam preformed hole |
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| 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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- 2021-11-10 CN CN202111324441.3A patent/CN113958125B/en not_active Expired - Fee Related
- 2021-11-10 CN CN202122738620.3U patent/CN216893504U/en not_active Expired - Fee Related
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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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