CN203007845U - Hoisting device of beam body - Google Patents
Hoisting device of beam body Download PDFInfo
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- CN203007845U CN203007845U CN 201220703072 CN201220703072U CN203007845U CN 203007845 U CN203007845 U CN 203007845U CN 201220703072 CN201220703072 CN 201220703072 CN 201220703072 U CN201220703072 U CN 201220703072U CN 203007845 U CN203007845 U CN 203007845U
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- beam body
- cable
- suspension
- crossbeam
- arch rib
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Abstract
The utility model belongs to the bridge engineering construction field and particularly relates to a hoisting device of a beam body. The hoisting device of the beam body is applicable to construction of an arch-shaped bridge and is matched with a cable crane to hoist the beam body. The hoisting device of the beam body comprises a cable portion which at least comprises two cables which are arranged in a parallel mode and the pulling direction of each of the two cables is overlapped with a plane arc ribs locate on. The hoisting device of the beam body further comprises at least a beam, a lifting mechanism and a running gear; at least two suspension points which are used for connecting the cables and a box grinder unit are respectively arranged on an upper portion and a lower portion of the beam; at least a pair of suspension points of the two pairs of suspension points which are respectively arranged on the upper portion and the lower portion of the beam are in a collision avoidance position between the arc ribs in the vertical direction; the lifting mechanism is used for enabling the box grinder unit to perform vertical motion; and the running gear is used for enabling the box grinder unit to perform reciprocating and syntropy motion along the drawing direction of an upper cable of the cable portion. The hoisting device of the beam body has the advantages of being easy to operate and practical, needing no repeated disassembling a tower crane to obtain a collision avoidance effect between the arc ribs, high in working efficiency and low in cost.
Description
Technical field
The utility model belongs to the Bridge Construction field, is specifically related to a kind of being applicable to and coordinates cable crane with the beam body hanging apparatus of hoisting beam body in the arch bridge construction.
Background technology
Arch bridge, loading characteristic is with the arch rib pressure-bearing, arch rib supporting place simultaneously has horizontal thrust, owing to comparing with steel bridge and Concrete beam bridge, possess save great deal of steel and cement, energy is durable, maintenance cost is few, the advantage such as aesthetic in appearance, the arch bridge structure is widely used in and has now in bridge construction at present.Because its arch rib is main supporting member, all is arranged in arch rib below across rivers and with the case beam that is arranged in parallel side by side as the main body of carrying bridge floor and with it with arch rib during actual the construction, thereby forms whole pontic.Due to after bridge construction is good, if construct in advance arch rib, will inevitably be positioned at the case beam because of arch rib integral body when follow-up construction box girder bridge face so and can't realizes the lifting lay-up operation of case beam as locating above the carrying bridge floor; Therefore, all arch bridge constructions are all to build in the mode of " first beam rear arch " at present, also namely at first arrange the operation matrix on the river course, and carry out the bridge floor lay-up operation on this matrix, and the load-bearing matrix that arranges again whole pontic at last is also arch rib.present above-mentioned Specific construction mode is all to realize by Support Method, also namely after calculating overall length of bridge, realize the piling in river and carry purpose by steel pipe support and trestle Bailey beam, thereby the people sets up a case beam rely transportation and the job platform of operation above river, the defective that above-mentioned form of construction work exists is: at first, the facility cost is huge, set up a job platform, discuss the spent costs of operation such as setting pile foundation in the river course for the present, only required huge steel pipe support and trestle Bailey beam quantity and cost are just very huge, thereby input cost is huge in advance to cause it, the business capital burden is heavier, secondly, environment pollution is large, is arranged in a large number the foreign matters such as the interior concrete pipe base that is used for holder support job platform of river water body and reinforcement component, soaks for a long time and will inevitably bring pollution to the water quality of rivers itself in water, again, removing very inconvenience and facility, to leave over hidden danger large, job platform is as an interim transportation and carrying platform, must be to need dismounting after the bridge completion, unimpeded to make it be unlikely to have influence on original river course on the one hand, also recyclable its part facility cost on the other hand, yet, even the above part dismounting in river course more for convenience, and be positioned at the following part of river, how to realize its convenient dismounting and can not bring hidden danger to the dredging of river course later stage, these are all present technology technical barriers in the urgent need to address, existing be all by directly along the river a road section water body At The Height cut to reclaim the pile foundation top and locate steel, and all can't realize dismantling fully to the steel and the piling strtucture that are stranded in below the river course water surface, the part pile foundation that its fracture is left over not only is easier to cause pollution of river phenomenon, also bring potential safety hazard to industries such as river course transportations, whether can develop that a kind of more input cost is low, easy and simple to handle and the arch bridge operating type of high efficiency is that those skilled in the art compel technical barrier to be solved always.
Summary of the invention
The purpose of this utility model is to provide a kind of beam body hanging apparatus simple in structure; Its environment pollution is little, easy and simple to handle and high efficiency.
For achieving the above object, the utility model has adopted following technical scheme: a kind of beam body hanging apparatus, comprise the cable portion as the suspention matrix of being used for that is positioned at the specified altitude assignment place, what described cable portion comprised two cables that be arranged in parallel and each cable at least draws set direction and arch rib place planes overlapping layout; Described beam body hanging apparatus also comprises at least one crossbeam, described crossbeam top and the bottom are provided with plural point of suspension for connecting cable and case beam element respectively, and at least one pair of point of suspension in described two pairs of point of suspension that are arranged at respectively the crossbeam top and the bottom is dodged the position being on vertical and between arch rib; Described beam body hanging apparatus also comprises be used to making the case beam element make the elevating mechanism of knee-action and making it draw set direction to make the walking mechanism of reciprocating action in the same way along cable on cable portion.
The beneficial effects of the utility model are: the utility model has been abandoned traditional wasting time and energy and the form of construction work of " the first beam rear arch " of expensive high maintenance, and at first realize laying for the processing of arch rib by tower crane, when adopting again tower crane to lift the case beam due to direct first tower crane construction arch rib, inevitable and the corresponding arch rib planes overlapping of living in of each cable arranges, thereby occurs unavoidably that original tower crane hawser and arch rib exist together a plane and the accurate lifting purpose that can't realize being positioned at the case beam below it; The utility model is herein by adopting beam structure, thereby be the point of suspension that is provided for suspension cord by the people to realize the effect of dodging between itself and arch rib, due to the point of suspension arch rib that staggers, the two pairs of ropes that are used for suspention case beam element or connection cable on point of suspension have also just been guaranteed to be connected in, must have a pair of is to be staggeredly arranged with arch rib, finally can realize also that by elevating mechanism and walking mechanism the repeatedly traction on same cable portion transports purpose; Its tower body deadweight is little, simple operation is practical, need not by the repeated removal tower crane can obtain and arch rib between dodge the transportation effect, high construction cost that the conventional stent method brings and the defective of high environment pollution have been avoided, high efficiency, that only need set up once simultaneously that tower crane can satisfy arch rib and case beam repeatedly settles respectively the assembling purpose, and input cost can greatly be reduced.
Description of drawings
Fig. 1 is the utility model working state schematic representation along arch rib section part subdivision;
Fig. 2 is the use status architecture schematic diagram of crossbeam;
Fig. 3 is the partial sectional view of beam-end;
Fig. 4 is the structural representation of tension board;
Fig. 5 is the end view of crossbeam;
Fig. 6-8 are the workflow diagram of the utility model when lifting case beam element;
Fig. 9-10 are that the another kind of crossbeam uses the status architecture schematic diagram.
The specific embodiment
A kind of beam body hanging apparatus comprises the cable portion as the suspention matrix of being used for that is positioned at the specified altitude assignment place, and what described cable portion comprised two cables that be arranged in parallel 10 and each cable 10 at least draws set direction and arch rib place planes overlapping layout; Described beam body hanging apparatus also comprises at least one crossbeam 20, described crossbeam 20 top and the bottom are provided with plural point of suspension for connecting cable and case beam element respectively, and at least one pair of point of suspension in described two pairs of point of suspension that are arranged at respectively crossbeam 10 top and the bottom is dodged the position being on vertical and between arch rib; Described beam body hanging apparatus also comprises be used to making the case beam element make the elevating mechanism of knee-action and making it draw set direction to make the walking mechanism of reciprocating action in the same way along cable on cable portion.
Be further: described crossbeam 20 top point of suspension are hung on two cables 10 of cable portion by lifting rope 30, also be provided with on crossbeam 20 for the suspension strop 40 that hangs lower square chest beam element, described suspension strop 40 is at least the point of suspension place, bottom of two and the crossbeam 20 that is placed in, and is set parallel to each other between each lifting rope and suspension strop; Coordinate realization for the suspention purpose of case beam element and cable 10 to rely between point of suspension and each rope.
At first use background of the present utility model has namely abandoned the mounting means of traditional " first beam rear arch ", and adopts the job practices of more easy " fitting the arch first then fitting the girder ", and its idiographic flow is as shown in Fig. 6-8; No matter arch rib a construction or the laying of the case beam element b in later stage in advance, all can by lie across in specified altitude assignment place, river course top cable portion realize lifting, also just avoided not only needing to drive piles and building carrying platform but also need to carry out high construction period that the later stage dismounting brings and the defective of high pollution of traditional Support Method.And the job practices of " fitting the arch first then fitting the girder ", its main marrow namely is: how after lifting is completed each arch rib unit and finally completed the construction of arch rib a, do not remove and directly again rely on the original hoisting structure that is positioned at arch rib a top to realize great-leap-forward lifting for the case beam element b of arch rib a below; Certainly, by again dismantling cable portion to enlarge its cable hold apart from being obviously to realize, still, and the dismounting of cable portion and refitting, its facility cost has almost been compared Support Method.The utility model is by the setting of above-mentioned crossbeam 20, thereby the location, two ends that makes crossbeam 20 arranges that point of suspension is with suspension strop 40 and/or the lifting rope 30 of staggering, that is to say, if crossbeam as shown in Figure 1 20 is between arch rib a and cable 10 time, rely on the crossbeam 20 of artificial location and tie point position suspension strop 40, make the spacing of the suspension strop 40 that is positioned at crossbeam 20 belows greater than the maximum spacing of arch rib a, realize its accessible lifting; Its structure is also shown in Fig. 9-10 in legend applicable to another kind of arrangement equally, and this can have its structure illustrated below, is just no longer given unnecessary details herein.generally speaking, the utility model relies on above-mentioned crossbeam 20 structures and suspension strop 40 and lifting rope 30 the hanging of different parts on crossbeam 20, thereby realized the effect of dodging between each rope and arch rib a, simultaneously, can realize also that by elevating mechanism and walking mechanism the repeatedly traction on same cable portion transports purpose, its tower body deadweight is little, simple operation is practical, need not by the repeated removal tower crane can obtain and arch rib between dodge the transportation effect, high construction cost that the conventional stent method brings and the defective of high environment pollution have not only been avoided, the high construction cost problem of also having avoided the repeated removal tower crane and having brought, its high efficiency only need once be set up the assembling of arrangement respectively that tower crane can be realized arch rib and case beam element simultaneously, and after whole construction is completed, its each parts can also disassemble to reuse, thereby greatly reduce actual input cost.
As further preferred version of the present utility model: as shown in Fig. 1 and Fig. 6-8, described crossbeam 20 is between arch rib and cable 10 and the plane layout of its beam length perpendicular direction arch rib place, and the described point of suspension spacing of crossbeam below that is positioned at is greater than two arch rib maximum spacings.This scheme is also above-mentioned suspension strop 40 and the first arrangement states of lifting rope 30 layouts, thereby realizes the purpose of dodging for the arch rib that has installed.
Further, as shown in Fig. 2-5, described crossbeam 20 comprises that cylindric main beam 21 reaches and the integral type tension board 22 of 21 affixed settings of main beam, described tension board 22 profiles be cubic plate body shape and therein two jiaos of ends run through plate body and be provided with for the drag-line hole that consists of point of suspension, described tension board 22 plate face directions are be arranged in parallel by direction of pull with it, and described cubic plate body shape tension board 22 is be placed in main beam 21 two ends places and its angle, place, two drag-lines hole distal process of symmetry shape and goes out main beam 21 periphery wall settings; Described tension board 22 profile parallelogram shapes and drag-line hole are arranged in its two acute ends place, described drag-line hole comprises for the first drag-line hole 221 of affixed lifting rope 30 and is used for the second drag-line hole 222 of affixed suspension strop 40, and described the first drag-line hole 221 is arranged at main beam 21 topmosts and the first drag-line hole 221 spacings less than the second drag-line hole 222 pitch arrangement; Described the first drag-line hole 221 spacings are between arch rib minimum spacing and arch rib maximum spacing; On described main beam 21, corresponding tension board 22 positions are run through its beam body and are offered the bar shaped through hole, and tension board 22 passes its bar shaped through hole and affixed with main beam 21, and wherein two parallel edges of tension board 22 are be arranged in parallel by direction of pull with it.The definition of above-mentioned arch rib center distance and arch rib maximum spacing, consider that mainly arch rib itself is the arched girder body, certainly exist the thickness on axial direction, the arch rib maximum spacing is the relative distal-most end interplanar distance between arch rib, and the arch rib minimum spacing is in like manner the adjacent surface spacing of two arch ribs.
In fact, when crossbeam 20 is between arch rib a and cable 10, how accurately and reliably to guarantee crossbeam 20 for the support effect of suspension strop 40, guarantee again that lifting rope 30 and 10 of cables are unlikely to receive extra moment loading simultaneously when work.The utility model is by arranging above-mentioned tension board 22, guaranteed that suspension strop 40 spacings are all the time greater than lifting rope 30 spacings, finally make crossbeam 20 and be positioned at the suspension strop 40 at crossbeam 20 two ends and lifting rope 30 has namely consisted of similar narrow and lower wide ladder-type structure on the whole, like this, after arch rib a installs, need not to dismantle cable portion (comprise tower crane and connect two tower cranes and across the cable 10 in river course), directly the cable portion by original restriction spacing that places can realize the laying purpose for case beam element b across arch rib a.Integral type design and unique plate face parallel the be subjected to layout of force direction thereof of tension board 22 as shown in Fig. 2-5 constructed, and relies on cleverly especially the high resistance pulling force of monoblock plate body, thereby realizes the high tensile purpose of crossbeam 20; In addition, drag-line hole by running through tension board 22 is as its point of suspension and with the grafting secure fit of 22 of bar shaped through hole default on main beam 21 and tension boards, also stopped traditional Split type welded and hung and establish the point of suspension weld seam tension breakage problem that device may bring; Regardless of the weight of case beam element b itself, suspention and the transportation purpose of the realization that its beam structure can be accurate and safe and reliable to case beam element b.
Guaranteed already the tensile property of crossbeam 20 due to above-mentioned tension board 22, herein as the utility model load main body, self requirement of strength for crossbeam 20 is also most important, therefore, the utility model following proposal is: as shown in Figure 5, also be furnished with in main beam 21 for the reinforcement gusset 211 that supports and be connected and fixed tension board 22, described 211 of the gussets of respectively strengthening are " ten " font symmetrical chiasma and are arranged in 22 liang of tension boards plate face place and arrange; Described main beam 21 also comprises and is the stiffener 212 that the wing uniform ring is arranged around its periphery wall, the parallel main beam 21 length direction settings of the plate length direction of described stiffener 212.Each strengthens " ten " font symmetrical chiasma structure of the cylindric main beam 21 of being positioned at of gusset 211, and also namely and the formation of 22 integral body of tension board similar " rich " character form structure, reality as shown in Figure 5; Like this, close by each stiffener 212 and the rank each other of strengthening gusset 211 affixed, thereby promoted greatly crossbeam 20 flexural strengths; During actual the employing or adopt by the many suspension strops 40 of postponing downwards on a crossbeam 20, the utility model structure of employing more than two groups that even also can be as shown in Fig. 6-8, thereby realizing that suspension strop 40 fixedly hangs for many suspension centres at lower square chest beam element two ends establishes purpose, to guarantee its stationarity, guarantee that finally its result of use satisfies actual safety required.
Further, the cable on described cable portion 10 is that two and level are fixed in specified altitude assignment place, two sides, river course; As shown in Fig. 1 and Fig. 6-8, being arranged on two cables 10 and connecting respectively cable 10 of described elevating mechanism c and walking mechanism d integral type arranges with lifting rope 30.In fact, the layout of each cable 10 and walking mechanism and even elevating mechanism, embodiment is more in this area, no matter be to realize the elevating function of elevating mechanism or the displacement function of walking mechanism by the cable crane hoist engine, or driving the formula pulley assembly by electricity realizes above-mentioned equal effect, be those skilled in the art in conjunction with the drawn conventional measure of the utility model technology, just give unnecessary details no longer one by one herein.
in fact, in such scheme, the method for arranging of its crossbeam 20 always is what employing top point of suspension spacing was as shown in Figure 2 carried out less than the mode of bottom point of suspension spacing, after carrying out according to this kind scheme, its final result that realizes is: take two point of suspension being arranged in crossbeam 20 tops as a pair of and right as another take another two point of suspension of crossbeam 20 bottoms, only needing this moment a pair of point of suspension of crossbeam 20 bottoms to be in arch rib the state of dodging on vertical gets final product, then by the tower crane spacing being equaled the arch rib spacing and directly carrying out arch rib and install, installing afterwards after the utility model to carry out the case beam element is also that the great-leap-forward of bridge floor is laid again.Yet, fact of case is, because arch rib a is by some arch rib cell formations equally and is to need tower crane to cooperate to complete to hang to establish equally, when crossbeam 20 of the present utility model was in as shown in Figure 9 structural behavior, it still can realize the above-mentioned effect of dodging of the present utility model; Its concrete structure can be with reference to shown in figure 9-10: at first consider cable 10 spacings are adjusted into greater than the arch rib maximum spacing this moment when arranging tower crane, first realizes the installation of each arch rib unit by crossbeam shown in Figure 10 20 structures and suspension strop 40 and lifting rope 30; After arch rib installs, then row dismounting crossbeam 20 carries out the installation of case beam element with direct dependence lifting rope 30; Its embodiment has just realized that also the described another kind of the utility model first paragraph realizes effect, that is: only need a pair of point of suspension on crossbeam 20 tops to be in arch rib the state of dodging on vertical and get final product; Also namely by crossbeam 20 being carried out small use state adjustment, and cable 10 spacings of cable portion on corresponding replacing tower crane, also realize equally the installation purpose of " fitting the arch first then fitting the girder ".Like this, its overall structure is not limited to a kind of embodiment, thereby has more highlighted the convenient and swift property of its use.
The utility model is by walking out the conventional thinking of " first beam rear arch " in prior art fully, and adopt the job practices of " the first beam rear arch " change all of a sudden, and the cable head of original cable portion and arch rib have been overcome in same plane and the problem that can't lift the case beam element that causes; Constructor's practical operation is efficient and convenient, avoided the defective of traditional expensive high duration of setting up carrying platform and bringing, only carry out hoist engine on ground and operate the control that can realize for elevating mechanism and walking mechanism, make it possess a table apparatus and repeatedly draw the purpose of transporting, its high efficiency, thus finally realize accurate installation for the case beam element under across the uniqueness lifting state of arch rib; In addition, when carrying out the utility model dismounting after whole pontic construction is completed, its each parts can also take off successively and reuse, and also greatly reduce the construction cost of unit in charge of construction, and its market prospects are wide.
Claims (10)
1. beam body hanging apparatus, it is characterized in that: comprise the cable portion as the suspention matrix of being used for that is positioned at the specified altitude assignment place, what described cable portion comprised two cables that be arranged in parallel (10) and each cable (10) at least draws set direction and arch rib place planes overlapping layout; Described beam body hanging apparatus also comprises at least one crossbeam (20), described crossbeam (20) top and the bottom are provided with plural point of suspension for connecting cable and case beam element respectively, and at least one pair of point of suspension in described two pairs of point of suspension that are arranged at respectively crossbeam (10) top and the bottom is dodged the position being on vertical and between arch rib; Described beam body hanging apparatus also comprises be used to making the case beam element make the elevating mechanism of knee-action and making it draw set direction to make the walking mechanism of reciprocating action in the same way along cable on cable portion.
2. beam body hanging apparatus according to claim 1, it is characterized in that: described crossbeam (20) is positioned between arch rib and cable (10) and its beam length perpendicular direction arch rib place plane layout, and the described point of suspension spacing of crossbeam below that is positioned at is greater than two arch rib maximum spacings.
3. beam body hanging apparatus according to claim 1 and 2, it is characterized in that: described crossbeam (20) top point of suspension is hung on two cables (10) of cable portion by lifting rope (30), also be provided with on crossbeam (20) for the suspension strop (40) that hangs lower square chest beam element, described suspension strop (40) is at least the point of suspension place, bottom of two and the crossbeam that is placed in (20), is set parallel to each other between each lifting rope and suspension strop.
4. beam body hanging apparatus according to claim 3, it is characterized in that: described crossbeam (20) comprise cylindric main beam (21) and and main beam (21) between the integral type tension board (22) of affixed setting, described tension board (22) profile be cubic plate body shape and therein two jiaos of ends run through plate body and be provided with for the drag-line hole that consists of point of suspension, described tension board (22) plate face direction is be arranged in parallel by direction of pull with it, described cubic plate body shape tension board (22) is be placed in place, main beam (21) two ends and its angle, place, two drag-lines hole distal process of symmetry shape and goes out main beam (21) periphery wall setting.
5. beam body hanging apparatus according to claim 4, it is characterized in that: described tension board (22) profile parallelogram shape and drag-line hole are arranged in its two acute ends place, described drag-line hole comprises for the first drag-line hole (221) of affixed lifting rope (30) and is used for the second drag-line hole (222) of affixed suspension strop (40), and described the first drag-line hole (221) is arranged at main beam (21) topmost and the first drag-line hole (221) spacing less than the second drag-line hole (222) pitch arrangement.
6. beam body hanging apparatus according to claim 5, it is characterized in that: described the first drag-line hole (221) spacing is between arch rib minimum spacing and arch rib maximum spacing.
7. beam body hanging apparatus according to claim 5, it is characterized in that: the upper corresponding tension board (22) of described main beam (21) position is run through its beam body and is offered the bar shaped through hole, tension board (22) passes its bar shaped through hole and affixed with main beam (21), and wherein two parallel edges of tension board (22) are be arranged in parallel by direction of pull with it.
8. beam body hanging apparatus according to claim 5, it is characterized in that: also be furnished with in main beam (21) for the reinforcement gusset (211) that supports and be connected and fixed tension board (22), describedly respectively strengthen being between gusset (211) " ten " font symmetrical chiasma and be arranged in tension board (22) two plate face places and arrange.
9. beam body hanging apparatus according to claim 8, it is characterized in that: described main beam (21) also comprises and is the stiffener (212) that the wing uniform ring is arranged around its periphery wall, the parallel main beam of plate length direction (21) the length direction setting of described stiffener (212).
10. according to claim 1 and 2 or 3 described beam body hanging apparatus is characterized in that: the cable on described cable portion (10) is that two and level are fixed in specified altitude assignment place, two sides, river course; Being arranged in two cables (10) upward and connecting respectively cable (10) of described elevating mechanism and walking mechanism integral type arranges with lifting rope (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220703072 CN203007845U (en) | 2012-12-19 | 2012-12-19 | Hoisting device of beam body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220703072 CN203007845U (en) | 2012-12-19 | 2012-12-19 | Hoisting device of beam body |
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| Publication Number | Publication Date |
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| CN203007845U true CN203007845U (en) | 2013-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220703072 Expired - Lifetime CN203007845U (en) | 2012-12-19 | 2012-12-19 | Hoisting device of beam body |
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| Country | Link |
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| CN (1) | CN203007845U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103015323A (en) * | 2012-12-19 | 2013-04-03 | 中铁十局集团第三建设有限公司 | Beam body hoisting device |
-
2012
- 2012-12-19 CN CN 201220703072 patent/CN203007845U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103015323A (en) * | 2012-12-19 | 2013-04-03 | 中铁十局集团第三建设有限公司 | Beam body hoisting device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130619 Effective date of abandoning: 20141203 |
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| RGAV | Abandon patent right to avoid regrant |