CN1091691A - A kind of method that makes the concrete component pore-forming with the rubber bar coring - Google Patents
A kind of method that makes the concrete component pore-forming with the rubber bar coring Download PDFInfo
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- CN1091691A CN1091691A CN 93118962 CN93118962A CN1091691A CN 1091691 A CN1091691 A CN 1091691A CN 93118962 CN93118962 CN 93118962 CN 93118962 A CN93118962 A CN 93118962A CN 1091691 A CN1091691 A CN 1091691A
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Abstract
A kind of construction method of concrete component pore-forming belongs to the building foundation technical field, is applicable to that pouring needs the concrete component of preformed hole.The principle that the present invention reduces to attenuate and progressively peeled off by concrete component hole inwall according to exoskeletal rubber bar radial dimension when axially loaded extends, certain diameter, exoskeletal rubber bar are embedded in the position that concrete component needs pore-forming, after treating concrete casting, solidifying, extract pre-buried rubber bar out, can in concrete component, form desired preformed hole.This method has that withdrawing is laborsaving, rubber bar is difficult for pulling off, can use repeatedly, withdrawing, advantage such as equipment is simple, hole wall is smooth at any time.
Description
The present invention relates to the construction method of post stressed concrete member pore-forming, belong to the building foundation technical field, mainly the core in the kiss core hole forming method has been done improvement.
When building trade pouring post stressed concrete member, no matter be prefabricated in precast plant, still directly pouring at the construction field (site), all need be in concrete component certain position is reserved the straight hole of certain diameter or the hole of camber is arranged, so that after concrete component solidifies, penetrate high tensile steel wire or steel strand wires, produce prestressing force after the stretch-draw.
In existing construction method, for pore-forming, the way of employing has: one, kiss core, as built-in metal pipe, plastic tube, sebific duct etc.; Two, buried metal bellows.
In the construction method of kiss core, when concrete initial set, (generally be controlled in six hours) and extract, surpass this time limit, just extract very difficulty.And the method for built-in metal pipe and plastic tube is only applicable to straight short hole, is common in the construction of floor, plate-girder.Long or when certain camber is arranged when preformed hole, then need the sebific duct of pre-buried braiding, the event of running affairs of breaking so very easily take place in the tensile strength that is much higher than sebific duct itself because of the adhesion strength and the frictional force of sebific duct and concrete component.Even use the steel wire sebific duct, tensile phenomenon also constantly takes place, and perhaps simply pulls out to come out.
For overcoming above-mentioned defective, Chinese invention patent CN1064720A, application number 91101420.9 disclose a kind of " preparation method of hollow concrete pile and producing device ", the tubular part that use has elasticity, can expand is as core, in tubular part, be pressed into liquid, make this tube-like piece be radial expanded state, fix, be embedded in the position that concrete-pile needs pore-forming with holding device, after treating the concrete casting sclerosis, reduce the interior pressure of tubular part, make the tubular part radial contraction, tubular part is pulled out from concrete-pile.This method can be well in concrete-pile pore-forming, core from concrete-pile, pull out at an easy rate.But also there is certain defective in this method, because processing problems, easily produces the irregular phenomenon that expands, and this method need be pressed into liquid in tubular part, thereby needs to increase pressurized equipment such as water pump and prevent the mending-leakage equipment that tubular part leaks.
Purpose of the present invention, provide a kind of withdrawing laborsaving, be difficult for breaking, concrete setting later on any time all pullable, do not need that increase equipment, technology are simple, the construction method of the concrete component pore-forming of easy construction.
For achieving the above object, the method that the present invention adopts is: as core, be embedded in the position that concrete component needs pore-forming with exoskeletal rubber bar, treat concrete casting, setting and hardening after, again rubber bar is extracted vertically pore-forming in concrete component.When the bore dia of reserving when needs was big, in order to save cost, also available exoskeletal heavy wall rubber tube was as core.
Among the present invention, the manufacture method of exoskeletal rubber bar or thick-walled pipe is a prior art, as long as the rubber bar intensity height of making, elasticity is strong, size is accurate, smooth surface.
The present invention is the incompressible performance of high strength, high resiliency and volume of utilizing rubber, and according to rubber bar rubber bar axial elongation, characteristics of radially attenuating when the axially loaded, the principle that core is progressively peeled off by the inwall in concrete component hole realizes.
The Poisson's ratio of rubber is about 0.5, and volume is incompressible, and when the length of rubber bar increased, its radial dimension must reduce.In extracting the process of rubber bar, stretching is to be extended inwards gradually by the outer end, the power of actual drawing is not the frictional force between rubber bar and the concrete hole wall, but rubber bar and concrete peeling force and rubber bar own wt spur the frictional force sum that produces at the bottom of the concrete hole.The prescription design of choose reasonable rubber bar can make the adhesion of rubber bar and concrete component very little; Frictional force when rubber bar spurs at the bottom of the concrete component hole also is limited, thereby it is very little to extract the pulling capacity that rubber bar needs.
According to test and theoretical calculating, when rubber bar was elongated to 50%, diameter had just dwindled 10%, and at this moment, rubber bar just is easy to extract.And the ultimate elongation of rubber is 500%, and the percentage elongation when rubber bar is come out by withdrawing is 1/10 of a ultimate elongation, therefore can not pull apart.
In addition, from breaking strength, according to mensuration, it is 0.8Mpa that rubber bar is elongated to 50% stretching strength, and the breaking strength of rubber bar is 18Mpa, during withdrawing, the withdrawing power of rubber bar is 1/22.5 of its breaking tenacity, so from breaking strength, rubber bar also can not be torn when extracting.
Because rubber bar has enough compression strength, can bear concrete pressure, thereby can guarantee the dimensional accuracy of pore-forming.The rubber bar surface smoothness is good in addition, makes the preformed hole hole wall that waters out smooth.
Since rubber bar when peeling off needed withdrawing power little, so the withdrawing time be not subjected to the influence in presetting period, as long as surpass initial setting time, when withdrawing can, this provides very big convenience for construction.
Construction method of the present invention is not only applicable to water the pore-forming of post stressed concrete member, and all need the concrete component of preformed hole to be applicable to pouring.The hole of reserving can be straight hole, curved hole, perforation or an end be blind hole.
Construction method of the present invention has the following advantage:
1, withdrawing is laborsaving, easy construction.
2, equipment is simple, does not need to increase auxiliary equipment;
3, be not subjected to the restriction in presetting period, no matter be solidified to what degree, rubber bar all is drawn out easily.
4, rubber bar elasticity and intensity are splendid, can use repeatedly, and long service life is mainly determined by anti-day marquis's degree of aging of rubber bar itself actual life.
5, the rubber bar surface smoothness is good, and the preformed hole hole wall is smooth.
Below in conjunction with accompanying drawing embodiments of the invention are further described.
Fig. 1 is the schematic diagram of the straight hole beams of concrete of pouring perforation.
Fig. 2 is the schematic diagram of the curved hole beams of concrete of pouring perforation.
Fig. 3 is the concrete-pile schematic diagram of blind hole for the pouring lower end.
Fig. 4 is the long concrete beam length bar structure schematic diagram of pouring.
Among the figure, 1 is template, and 2 is two Side Templates, and 3 is two Side Template perforates, and 4 is rubber bar, and 5 is concrete, and 6 is retainer ring, and 7 is joint, and 8 are fixing reinforcing bar.
Wherein, template perforate 3 is a garden shape, and rubber bar 4 therefrom passes, and enough enough drawing lengths are stayed at two ends.Retainer ring 6 is fixed on the reinforced steel 8, at intervals is provided with one, in order to tighten rubber bar.The position of plug perforate 3 and retainer ring 6 is used for fixing the position of rubber bar 4 by the determining positions in the hole of needs reservation, produces come-up or drift when preventing placing concrete.
When pouring shown in Figure 3 one end is the concrete-pile of blind hole, need be with the hole sealing of the mesopore or the heavy wall rubber tube of the rubber bar 4 of blind hole one end, the mesopore of avoiding mortar to pour into rod or pipe forms anchor head.
When the long beams of concrete of pouring shown in Figure 4, for reducing withdrawing power, can pull out from two separated in the rubber bar, at this moment section must tightly be wrapped up with joint 7, avoids forming anchor head.
During pouring, concrete 5 watered be filled between template 1, two Side Templates 2 and the rubber bar 4, with vibrator shaking concrete 5, treat concrete 5 setting and hardenings after, withdrawing goes out rubber bar 4 again.
Method of the present invention is repeatedly on probation, respond well in practice of construction.
Claims (2)
1, a kind of construction method of concrete component pore-forming, the clava of certain diameter is preset at the position that concrete component needs pore-forming, treat concrete casting, solidify the pre-buried clava of back extraction, in concrete component, form preformed hole, it is characterized in that pre-buried clava is exoskeletal rubber bar (4).
2, the construction method of a kind of concrete component pore-forming according to claim 1 is characterized in that pre-buried clava is exoskeletal heavy wall rubber tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93118962 CN1091691A (en) | 1993-10-15 | 1993-10-15 | A kind of method that makes the concrete component pore-forming with the rubber bar coring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93118962 CN1091691A (en) | 1993-10-15 | 1993-10-15 | A kind of method that makes the concrete component pore-forming with the rubber bar coring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1091691A true CN1091691A (en) | 1994-09-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93118962 Pending CN1091691A (en) | 1993-10-15 | 1993-10-15 | A kind of method that makes the concrete component pore-forming with the rubber bar coring |
Country Status (1)
| Country | Link |
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| CN (1) | CN1091691A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102001129A (en) * | 2010-09-17 | 2011-04-06 | 黑龙江宇辉新型建筑材料有限公司 | Pore forming method and pore forming part of special shape for connecting precast concrete units |
| CN102528922A (en) * | 2011-12-23 | 2012-07-04 | 中铁十九局集团第五工程有限公司 | Drawing and pulling device of rubber rod broken off in precast box girder hole |
| CN103213196A (en) * | 2013-03-29 | 2013-07-24 | 大连大金马基础建设有限公司 | Prestressed concrete square pile spiral pipe driving device |
| CN108660910A (en) * | 2017-03-31 | 2018-10-16 | 比亚迪股份有限公司 | Precast pier, track support component and its manufacture installation method |
| CN108660912A (en) * | 2017-03-31 | 2018-10-16 | 比亚迪股份有限公司 | Precast pier, track support component and its manufacture installation method |
| CN108755735A (en) * | 2018-06-13 | 2018-11-06 | 中国二十二冶集团有限公司 | Wind power foundation prestress wire preformed hole construction method and its special withdrawing stick |
-
1993
- 1993-10-15 CN CN 93118962 patent/CN1091691A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102001129A (en) * | 2010-09-17 | 2011-04-06 | 黑龙江宇辉新型建筑材料有限公司 | Pore forming method and pore forming part of special shape for connecting precast concrete units |
| CN102528922A (en) * | 2011-12-23 | 2012-07-04 | 中铁十九局集团第五工程有限公司 | Drawing and pulling device of rubber rod broken off in precast box girder hole |
| CN103213196A (en) * | 2013-03-29 | 2013-07-24 | 大连大金马基础建设有限公司 | Prestressed concrete square pile spiral pipe driving device |
| CN103213196B (en) * | 2013-03-29 | 2015-10-28 | 大连大金马基础建设有限公司 | Prestressed concrete square pile spiral-tube driving device |
| CN108660910A (en) * | 2017-03-31 | 2018-10-16 | 比亚迪股份有限公司 | Precast pier, track support component and its manufacture installation method |
| CN108660912A (en) * | 2017-03-31 | 2018-10-16 | 比亚迪股份有限公司 | Precast pier, track support component and its manufacture installation method |
| CN108755735A (en) * | 2018-06-13 | 2018-11-06 | 中国二十二冶集团有限公司 | Wind power foundation prestress wire preformed hole construction method and its special withdrawing stick |
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Addressee: Huang Lianjing Document name: Reject the decision |