CN102433845B - Novel temporary solidification system used for continuous beam cantilever construction - Google Patents
Novel temporary solidification system used for continuous beam cantilever construction Download PDFInfo
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- CN102433845B CN102433845B CN2011104506358A CN201110450635A CN102433845B CN 102433845 B CN102433845 B CN 102433845B CN 2011104506358 A CN2011104506358 A CN 2011104506358A CN 201110450635 A CN201110450635 A CN 201110450635A CN 102433845 B CN102433845 B CN 102433845B
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Abstract
The invention discloses a novel temporary solidification system used for the continuous beam cantilever construction, comprising temporary supports and anti-overturning devices, wherein the temporary supports and the anti-overturning devices are placed between the top surface of a pier body and a cast-in-place section of a beam body; each anti-overturning device is a slender rod piece; one end of the slender rod piece is embedded in a lower-part support structure of the beam body, and the other end of the slender rod piece is anchored in the cast-in-place section of the beam body; a permanent support is supported between the lower-part support structure of the beam body and the cast-in-place section of the beam body; two rows of temporary supports and two rows of anti-overturning devices are arranged; the temporary supports and the anti-overturning devices are arranged symmetrical to the beam body along a bridge-direction axial line and are also arranged symmetrical to the lateral bridge-direction axial line of the permanent support; each anti-overturning device comprises an anti-overturning pull rod and a corrugated pipe outwards sleeved outside the anti-overturning pull rod; and each temporary support is a flexible temporary support comprising a steel plate and rubber. According to the novel temporary solidification system disclosed by the invention, the problem of generating bigger structural secondary internal force because the permanent support sags when the temporary solidification of the beam body is relieved can be furthest avoided. The novel temporary solidification system is convenient to assemble and disassemble, saves construction time and construction cost, ensures that the temporary support can be reused, and can be widely applied to the temporary support of the cast-in-place stage of the continuous beam.
Description
Technical field
The present invention relates to a kind of ancillary method of a kind of ancillary method in a kind of Construction of continuous beam stage, particularly a kind of continuous beam cantilever construction stage.
Background technology
The temporary consolidation system of continuous beam cantilever construction has multiple, but sum up the most basic have two kinds, these two kinds of temporary consolidation systems the most basic are as follows: a kind ofly be, directly carry out the pier beam consolidation on the pier shaft end face of bridge pier, at bridge pier pier shaft end face, the rigidity temporary cushion block is set, the rigidity temporary cushion block is reinforced concrete block or the block that is comprised of steel concrete and sulphur-bonded mortar, for girder; The overturning or slip resistance analysis pull bar be comprised of reinforcing bar or prestressed strand is set between pier shaft and beam body, and pier shaft and Liang Tizhong are stretched into respectively in the pull bar two ends, for anchoring beam body, avoid the beam body to topple, and prestressed strand carries out the mud jacking sealing in stretch-draw later.
Another kind is, beyond pier shaft, near support cast-in-place sections end, the temporary supporting bar is set, for girder.The temporary supporting bar can adopt steel pipe, or adopts the shaped steel spelling, can directly stretch into the beam embodiment as the overturning or slip resistance analysis pull bar at the welded top reinforcing bar and water in sections.The temporary supporting bar also can adopt reinforced concrete upright column, and inner embedding overturning or slip resistance analysis pull bar stretches into the beam embodiment and waters in sections.Other temporary consolidation system is in fact all that the part by these two kinds of systems combines mutually, with above-mentioned both are similar.
The common defects of above-mentioned these two kinds of temporary consolidation systems the most basic is:
1, the temporary cushion block of girder, temporary supporting pole pair beam body are all non-yielding props, and itself does not have compressibilty; The overturning or slip resistance analysis pull bar be comprised of reinforcing bar does not have flexibility, and the overturning or slip resistance analysis pull bar be comprised of prestressed strand, because the steel bundle carries out the mud jacking sealing in stretch-draw later, has also lost flexibility.Although permanent bearing has compressibility, but be all the reason of non-yielding prop because of temporary cushion block, temporary supporting pole pair beam body, the beam body of cantilever construction can not be along with the increase of the propelling of cantilever construction progress, self load and corresponding compression temporary cushion block, temporary supporting bar and descend, therefore, before removing temporary consolidation, the permanent bearing of continuous beam in fact just bears beam body load (basically just bearing the fractional load of cast-in-place sections) seldom, and most load is all to be born by the temporary cushion block of non-yielding prop, temporary supporting bar.Because could remove temporary consolidation after closing up, so, after removing temporary consolidation, under the effect of the deadweight of beam body and working load, the permanent bearing of continuous beam will inevitably produce compression, depression, although considered the depression problem of permanent bearing when design, but the complexity due to structure stress, and the operation of removing temporary consolidation is difficult to symmetry and accurately completes simultaneously, consideration to the depression of supports problem is difficult to thoughtfully and fully tally with the actual situation comprehensively, so, continuous beam produces structure time internal force problem because of depression of supports still exists, and there is a possibility of considerable influence.Produce larger structure time internal force because of depression of supports and can cause the beam body crack to occur, have influence on quality and the application life of bridge.
2, the construction period of traditional temporary consolidation system is relatively long.After temporary cushion block concreting, reach the certain length of time and intensity and just can carry out the construction that sections is watered in the embodiment of next step operation------beam.
3, the dismounting duration of traditional temporary consolidation system longer, the manpower and the mechanical one-shift that need are relatively many.The temporary cushion block concrete need to cut, and the temporary supporting bar needs to cut, pulls up, slings and transport.
For these reasons, seek the temporary consolidation system that can overcome above-mentioned defect or reduce above-mentioned defective effect as far as possible significant, necessary.
Summary of the invention
The purpose of this invention is to provide a kind of novel temporary consolidation system that the continuous beam cantilever construction is used, solving existing temporary consolidation system is that non-yielding prop and rigidity link, can't realize before the temporary consolidation system is removed fully, allow beam body load substantially be born by permanent bearing, thereby avoid causing permanent bearing deflection after removing the temporary consolidation system to cause that greatly the beam body produces the technical problem of structure time internal force; And solve the problem of existing temporary consolidation system long construction period, complicated construction technique.
For achieving the above object, the present invention adopts following technical scheme:
A kind of novel temporary consolidation system that the continuous beam cantilever construction is used, comprise temporary support and anti-overturning devices, described temporary support is placed between the cast-in-place sections of the pier shaft end face of bridge pier and beam body, described anti-overturning devices is the slender type assembly, the one end is embedded in the cushion cap of the pier shaft of bridge pier or bridge pier, the other end is anchored in the cast-in-place sections of beam body, be supported with permanent bearing between the pier shaft end face of bridge pier and the cast-in-place sections of beam body, described temporary support and anti-overturning devices are two rows, temporary support, anti-overturning devices all is symmetrical in the suitable bridge of beam body to axis arranged, simultaneously, also be symmetrical in the direction across bridge axis arranged of permanent bearing, described anti-overturning devices is comprised of overturning or slip resistance analysis pull bar and the bellows that is enclosed within overturning or slip resistance analysis pull bar outside, described temporary support is the flexible temporary support that steel plate and rubber form.
The steel bundle that described overturning or slip resistance analysis pull bar is comprised of high strength steel strand.
Be applied with prestressing force on the overturning or slip resistance analysis pull bar, between itself and bellows inwall, leave space.
Directly contact between the cast-in-place sections of described flexible temporary support and bridge pier pier shaft end face and beam body, but do not link.
Described flexible temporary support by lower supporting block, unload carrier layer and upper supporting block and stack gradually and form, described unload carrier layer by the material with mobility or after being heated, be easy to melt, softening solid material fills and forms, described upper supporting block and lower supporting block are formed by steel plate layer and block rubber intersecting bonding, the block plate that pushes up most of described lower supporting block extends and upwards is bent to form the spacing sidewall that unloads carrier layer to four limits, has the pod apertures that the filler of being convenient to unload carrier layer flows out on described spacing sidewall.
Compared with prior art the present invention has following characteristics and beneficial effect:
At first, the present invention is by adopting flexible temporary support and flexible anti-overturning devices, can realize that the load that permanent bearing bears can progressively increase along with the propelling of cantilever casting construction progress, avoided to greatest extent the beam body to close up after when removing temporary consolidation because depression of supports produces the problem of larger structure time internal force.
Secondly, due to the employing of the flexible temporary support of finished product, with existing cast-in-situ concrete temporary support, compare, construction is in earlier stage without building and the maintenance certain hour, and the later stage, without cutting, is therefore saved the duration, easy construction; Because the flexible temporary support of finished product is independently one, separate with anti-overturning devices in addition, though with bridge pier and beam body between directly contact, but do not link, temporary support inside is provided with unloads carrier layer, thus can dismantle easily and recycle, thus can reduce construction cost.Simultaneously, be arranged on pier shaft temporary supporting bar in addition owing to having cancelled in existing temporary consolidation system, eliminated the defect that the construction dangerous matter sources of bringing due to the temporary supporting bar is more, security risk large, the construction interference is large, the material cost of temporary supporting bar and assembling and disassembling construction cost are all higher, cancel the temporary supporting bar and significantly reduced especially construction costs from another angle when not reducing safety of structure.
Also have, in anti-overturning devices, the steel bundle is arranged in bellows, utilize bellows by steel Shu Yuliang body, pier shaft, the concrete of cushion cap is kept apart, avoided the steel bundle contaminated, simultaneously can the sealing stretching end after stretch-draw, but can not be to the object of bellows interior pressure injection sealing, this has guaranteed whole anti-overturning devices except the function that anchoring and stable beam body are arranged, also there is following functions: temporary support, permanent bearing is compressed because of the newly increased load that bears the beam body, thereby generation depression, cause that the beam body descends, the direction that the beam body descends is consistent with the retraction direction of steel bundle under the prestressing force effect, and prestressed strand is not because processed by mud jacking, so steel Shu Buhui stops the decline of beam body, the bellows of inner not pressure injection sealing itself can compressed distortion, this has just realized that the confrontation between systems device that topples will have compressible requirement.
The present invention can be widely used in the temporary support in continuous beam cantilever casting construction stage.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Fig. 1 is structural representation of the present invention.
Fig. 2 is the A-A sectional view of Fig. 1.
Fig. 3 is flexible temporary support detail of construction one.
Fig. 4 is flexible temporary support detail of construction two.
Under the flexible temporary support of Reference numeral: 1-, the upper supporting block of 1.1-, 1.2-, supporting block, 1.3-unload the cast-in-place sections of carrier layer, the spacing sidewall of 1.4-, 1.5-pod apertures, 1.6-gap, the pier shaft of 2-bridge pier, the permanent bearing of 3-, 4-anti-overturning devices, 4.1-overturning or slip resistance analysis pull bar, 4.2-bellows, 4.3-space, 5-beam body, the cushion cap of 6-bridge pier.
The specific embodiment
Embodiment is referring to shown in Fig. 1 and Fig. 2, a kind of novel temporary consolidation system that the continuous beam cantilever construction is used, comprise 1 space, temporary support space and 4 spaces, anti-overturning devices space, 1 space, described temporary support space is placed between 5 spaces, cast-in-place sections space of the pier shaft space 2 space end faces of bridge pier and beam body, 4 spaces, described anti-overturning devices space are the slender type assembly, the one end is embedded in 6 spaces, cushion cap space of 2 spaces, pier shaft space of bridge pier or bridge pier, the other end is anchored in 5 spaces, cast-in-place sections space of beam body, be supported with 3 spaces, permanent bearing space between the pier shaft space 2 space end faces of bridge pier and 5 spaces, cast-in-place sections space of beam body, it is characterized in that: described temporary support and 4 spaces, anti-overturning devices space are two rows, temporary support, anti-overturning devices all is symmetrical in the suitable bridge of beam body to axis arranged, simultaneously, also be symmetrical in the direction across bridge axis arranged of permanent bearing, 4 spaces, described anti-overturning devices space are comprised of 4.1 spaces, overturning or slip resistance analysis pull bar space and 4.2 spaces, bellows space that are enclosed within 4.1 outsides, spaces, overturning or slip resistance analysis pull bar space, described temporary support is 1 space, flexible temporary support space that steel plate and rubber form.
4.1 spaces, described overturning or slip resistance analysis pull bar space are the steel bundle be comprised of high strength steel strand.
In the use procedure of this kind of novel temporary consolidation system, in fixed system, to play in the process of temporary consolidation effect, overturning or slip resistance analysis pull bar space is applied with prestressing force on 4.1 spaces all the time.4.2 inside, space, bellows space are the object of pressure injection sealing not, makes to leave 4.3 spaces, space, space between its inwall and 4.1 spaces, overturning or slip resistance analysis pull bar space.
Directly contact between the pier shaft space 2 space end faces of 1 space, described flexible temporary support space and bridge pier and 5 spaces, cast-in-place sections space of beam body, but do not link.
Temporary support can be temporarily fixed at the pier shaft end face with bolt etc.
Described flexible temporary support 1 is referring to Fig. 3 and Fig. 4, by lower supporting block 1.2, unload carrier layer 1.3 and upper supporting block 1.1 and stack gradually and form, the described filler that unloads carrier layer be sand, liquid etc. there is the material of mobility or be heated after be easy to melt, softening solid material.Described upper supporting block 1.1 and lower supporting block 1.2 are formed by steel plate layer and block rubber intersecting bonding, and the described block rubber whole steel plate layers of whole parcel or part are wrapped up the steel plate layer.The block plate that pushes up most of described lower supporting block 1.2 extends and upwards is bent to form the spacing sidewall 1.4 that unloads carrier layer to four limits, has the pod apertures 1.5 that the filler of being convenient to unload carrier layer flows out on described spacing sidewall 1.4.The described filler that unloads carrier layer 1.3 be sand, liquid etc. there is the material of mobility or be heated after be easy to melt, softening solid material.After being heated, be easy to melt and softening such as certain plastics, sulphur-bonded mortar etc. of solid material.If adopt husky or adopt fluent material to be used as unloading layer material, spacing sidewall 1.4 exceeds and unloads the height that carrier layer 1.3 is certain, and unloads between carrier layer and spacing sidewall and do not interspace in advance.If adopt after being heated the monoblock solid material that is easy to melt or soften, include heating wire as the unloading layer material, it is low that the aspect ratio of spacing sidewall is unloaded carrier layer, and spacing sidewall and reserved certain 1.6 spaces, space, gap, the side of unloading carrier layer, with compressive strain after facilitating the unloading layer material softening; And, have the power line hole on described spacing sidewall 1.4.If adopt fluent material to be used as unloading layer material, unload the cavity structure body that carrier layer adopts independent reserved plughole, inside fills the liquid drainage material; The material of this cavity structure body has suitable intensity, and material itself can not damaged by pressure by the beam body; Simultaneously, the cavity structure body, after the removal discharged material, can be compressed, shrivel by the beam body, can not stop the beam body to fall; During installation, unload carrier layer and be placed in unloading in the carrier layer groove of lower supporting block, the reserved plughole of cavity structure body is over against the pod apertures on the spacing sidewall of lower supporting block.
Size relationship between the concrete structure of bellows and it and overturning or slip resistance analysis pull bar is deferred to the bellows of traditional pre-stress system.Its quantity and every a branch of steel strand radical, tension stress all determine according to overturning or slip resistance analysis result of calculation, during the tension stress of calculating should be controlled at whole cantilever construction, remove in the scope that can not lose fully because of the compressed depression of temporary support before temporary consolidation.
Operating principle of the present invention: in construction period, temporary support bears the deadweight of beam body and the load above the beam body together with permanent bearing.Because flexible temporary support has certain compressibilty, can be increased compression along with the increase of beam body load, and the steel bundle be comprised of high strength steel strand has flexibility, because not by the pressure injection sealing, so can not stop the beam body because flexible temporary support, permanent bearing is compressed and corresponding whereabouts, this just guaranteed to make permanent bearing and temporary support can synchronize space or slightly one step ahead space bear beam body newly increased load, the depression that makes permanent bearing progressively occurs along with the propelling of cantilever construction.Adopt " synchronously " still " slightly one step ahead " actually, can be decided by the design compressibilty of permanent bearing, temporary support.After completing cantilever construction, before closure construction, unload carrier layer by the height adjustment mechanism on temporary support temporary support reduced, thus realize allowing before closing up permanent bearing bear fully beam body load and above load, realize that the compression subsidence of permanent bearing farthest occurs.After completing the continuous beam closure construction, put an overturning or slip resistance analysis steel bundle, remove prestressing force, that section overturning or slip resistance analysis steel bundle between beam body bottom surface and bridge pier pier shaft end face cut off, removes, remove temporary support, reach the purpose of final releasing temporary consolidation.
Claims (3)
1. a kind of novel temporary consolidation system that the continuous beam cantilever construction is used, comprise temporary support (1) and anti-overturning devices (4), described temporary support (1) is placed between the cast-in-place sections (5) of pier shaft (2) end face of bridge pier and beam body, described anti-overturning devices (4) is the slender type assembly, the one end is embedded in the cushion cap (6) of the pier shaft (2) of bridge pier or bridge pier, the other end is anchored in the cast-in-place sections (5) of beam body, be supported with permanent bearing (3) between the cast-in-place sections (5) of the pier shaft of bridge pier (2) end face and beam body, it is characterized in that: described temporary support and anti-overturning devices (4) are two rows, temporary support, anti-overturning devices all is symmetrical in the suitable bridge of beam body to axis arranged, simultaneously, also be symmetrical in the direction across bridge axis arranged of permanent bearing, described anti-overturning devices (4) is comprised of overturning or slip resistance analysis pull bar (4.1) and the bellows (4.2) that is enclosed within overturning or slip resistance analysis pull bar (4.1) outside, described temporary support is the flexible temporary support (1) that steel plate and rubber form, the steel bundle that described overturning or slip resistance analysis pull bar (4.1) is comprised of high strength steel strand, the overturning or slip resistance analysis pull bar is applied with prestressing force on (4.1), between itself and bellows (4.2) inwall, leaves space (4.3).
2. a kind of novel temporary consolidation system that continuous beam cantilever according to claim 1 construction is used is characterized in that: directly contact between the cast-in-place sections (5) of described flexible temporary support (1) and bridge pier pier shaft (2) end face and beam body, but do not link.
3. a kind of novel temporary consolidation system that continuous beam cantilever construction according to claim 1 is used, it is characterized in that: described flexible temporary support (1) is by lower supporting block (1.2), unloading carrier layer (1.3) and upper supporting block (1.1) stacks gradually and forms, described unload carrier layer (1.3) by the material with mobility or be easy to after being heated melt, softening solid material is filled and is formed, described upper supporting block (1.1) and lower supporting block (1.2) are formed by steel plate layer and block rubber intersecting bonding, the block plate that pushes up most of described lower supporting block (1.2) extends to four limits and upwards is bent to form the spacing sidewall (1.4) that unloads carrier layer, have the pod apertures (1.5) that the filler of being convenient to unload carrier layer flows out on described spacing sidewall (1.4).
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| CN2011104506358A CN102433845B (en) | 2011-12-29 | 2011-12-29 | Novel temporary solidification system used for continuous beam cantilever construction |
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| CN2011104506358A CN102433845B (en) | 2011-12-29 | 2011-12-29 | Novel temporary solidification system used for continuous beam cantilever construction |
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| CN106120568B (en) * | 2016-08-18 | 2017-09-26 | 德州市公路工程总公司 | The construction method of cross a river Main Bridge bridge pier secondary locking temporary consolidation structure |
| CN107144385B (en) * | 2017-05-22 | 2019-07-12 | 中电建路桥集团有限公司 | The monitoring method of torque in a kind of bridge cantilever method symmetrical construction |
| CN108755443B (en) * | 2018-08-31 | 2024-01-30 | 中交路桥北方工程有限公司 | Temporary pier beam consolidation device |
| CN109056547B (en) * | 2018-09-14 | 2023-09-26 | 宁波交通工程建设集团有限公司 | Temporary consolidation structure of continuous beam bridge pier and construction method |
| CN109505254A (en) * | 2018-12-24 | 2019-03-22 | 中铁三局集团有限公司 | A kind of temporary consolidation construction method suitable for large-span continuous girder bridges |
| CN111082351B (en) * | 2019-11-29 | 2021-12-28 | 北京中科中电电力工程管理有限公司 | Installation process and equipment of high-voltage switch cabinet |
| CN114263120B (en) * | 2022-01-07 | 2024-01-19 | 南京交通职业技术学院 | BIM-based temporary consolidation construction structure and method for large cantilever bridge body |
| CN114657860B (en) * | 2022-04-17 | 2024-02-02 | 石家庄铁道大学 | Damage stopping device for large-cantilever single-column pier bridge after being impacted |
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| CN101469533A (en) * | 2007-12-28 | 2009-07-01 | 上海市基础工程公司 | Pier top supportless temporary consolidation technique |
| CN100595386C (en) * | 2008-03-28 | 2010-03-24 | 郝贤成 | Sedimentation support for bridge |
| JP5319216B2 (en) * | 2008-09-08 | 2013-10-16 | 三井住友建設株式会社 | Bridge girder erection device and bridge girder erection method |
| CN101942803B (en) * | 2010-07-09 | 2015-04-22 | 中冶建工集团有限公司 | Bridge construction method implemented by simply supporting, forming continuous beam and removing temporary medium steel support in sequence |
| CN202482777U (en) * | 2011-12-29 | 2012-10-10 | 广东冠粤路桥有限公司 | Novel temporary solidification system for bridge construction |
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