CN102704413B - Construction method for jacking arch bridge - Google Patents
Construction method for jacking arch bridge Download PDFInfo
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- CN102704413B CN102704413B CN201210209726.7A CN201210209726A CN102704413B CN 102704413 B CN102704413 B CN 102704413B CN 201210209726 A CN201210209726 A CN 201210209726A CN 102704413 B CN102704413 B CN 102704413B
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Abstract
The invention relates to a bridge maintaining and reinforcing technology, in particular to a construction method for jacking an arch bridge. The method is characterized by comprising the following steps of: (1) jacking base and limit post pouring; (2) tray girder pouring; (3) integral jacking; (4) jointing construction; and (5) support base installation, wherein the precedence order of the step (1) and the step (2) is interconvertible. The construction method for jacking the arch bridge disclosed by the invention has the advantages that the operation is simple, the safety is high, and the transferring of force is clear; the span of arch is slightly decreased after jacking, but the integrity of the pier foundation is good after the arch bridge is jacked in position, and the total degree of safety is higher than that of the original design; a prestressing tendon does not need to be tensioned in the construction period, and the incision of a tensioning working plane is omitted; and a road does not need to be closed, and the normal operation of the road is not affected.
Description
Technical field
The present invention relates to a kind of maintenance and reinforcing technique of bridge, relate in particular to the construction method of arch bridge jacking.
Background technology
In river course, when the transformation of highway, railway, bridge usually need to carry out jacking to its entirety because headroom is not enough, and arch bridge is because of stressed comparatively complicated, and its jacking is the difficulties in bridge jacking especially.Bridge jacking construction must guarantee globality, safety, the reliability of former bridge construction, must avoid the generation of the situation such as extremely incident horizontal off normal, distortion, vibration, impact in jacking process, guarantee the safe and reliable original structure that is not less than of new construction, therefore the synchronism of jacking displacement and stress equalization are the keys of construction control.The key of arch bridge jack-up construction is to offset the horizontal thrust in arch bridge jacking process, in practical application, usually take with three kinds of constructure scheme: (1) impost inner side open interior large outside grapnel groove, by presstressed reinforcing steel by ground tackle and concrete anchoring in anchor groove, tensioned prestressing bar, then cuts impost and basis; (2) joint-cutting after impost then bores lateral aperture in impost, connects impost, tensioned prestressing bar, and presstressed reinforcing steel is anchored at impost rear portion; (3) after impost, cut vertical lap seam, carriage is installed, when jacking, rely on carriage to reduce resistance, horizontal thrust is provided simultaneously.
All there are some shortcomings in above-mentioned three kinds of schemes.Scheme 1 anchoring strength deficiency, stretch-draw prestressing force risk is high, and middle part needs additional anchor.After scheme 2 imposts, need to cut out enough stretch-draw space, cutting area is large, and expense is high.And in scheme 1 and scheme 2, prestressed reinforcement absolute altitude below existing road surface, needs local failure road surface under bridge.Scheme 3 requires very high to perps cutting accuracy after impost, may be stuck while there is error, and risk is higher.
Summary of the invention
The object of the present invention is to provide a kind of simple to operate, safe arch bridge jack-up construction method.
Technical scheme particular content of the present invention is: a kind of construction method of arch bridge jacking, comprises the following steps:
(1) build jacking base and limited post: arch bridge base position is excavated to concrete foundation end face, then concreting carries out Longitudinal Extension processing to former impost, new impost length after expansion is greater than the distance of the first arch rib outside to the second arch rib inner side, between expansion position and former basis, former impost, answer dabbing, the concavo-convex degree of depth is not less than 6mm, new impost after extension process is as jacking base, and jacking base is the counter-force basis of arch bridge jacking; Limited post and jacking base monobloc cast, limited post is the rectangular-shaped concrete column perpendicular to jacking base upper surface, it is high that limited post cylinder vertical missing is not more than one thousandth post, and the concrete size of length and width of limited post will be according to the Calculation and Analysis of Force of jacking bridge is determined.Limited post can be offset the horizontal thrust in arch bridge jacking process, also can prevent from arch bridge jacking process occurring laterally, vertical misalignment simultaneously.
(2) build pallet beam: above impost, build pallet beam, pallet beam is rectangular-shaped concrete platform, its outer end end points is in the first arch rib outside, and its inner end points is in the inner side of the main arch of same level, and its width is greater than the width of arch rib; Clearance height three's sum between arch bridge jacking overall height, pallet depth of beam and pallet beam and jacking base equals the height of limited post; Clearance height between pallet beam and jacking base equals suspended ceiling steel plate thickness, jack height, tool-type pad thickness and reserved operating space height sum; Pallet beam inside is provided with spacing hole, and quantity, size, the position distribution of quantity, size, position distribution and the limited post of spacing hole match.Gap between pallet beam and jacking base is used for laying jack, and therefore it highly depends primarily on the height of adopted jack, if the jack height using is 40cm, described reserved operating space height is generally 2-5cm.
(3) integral jacking:
A. clear up behind shrinkage joint, arrange, install several jack and supporting steel pipe on jacking base, arrange, several jack are installed at abutment bearing place, the weight of the number Main Basis jacking bridge of required jack and supporting steel pipe is determined.
B. after all preparation completes, jack is carried out to punching press 60%, make it tentatively stressed, then utilize rope saw to being connected between anchor point and bridge arch and impost carrying out cutting and separating, it is all thrown off, cutting absolute altitude position between lifting platform and jacking base.
C. check the reliability of jack-up system, comprise the reliability of check element, the reliability of system, the cleannes of hydraulic oil, stability, the stability of position closed loop etc. of power closed loop.
D. weigh: first will carry out pressurize test, install oil cylinder, oil pipe, pumping plant console, monitor and check errorlessly, by 70%～90% pressurization of calculating load, carry out the pressurize test of oil cylinder, check the working condition of whole system, oil circuit situation, before jacking, should measure the actual loading at each Jacking point place according to calculating jacking load, adopt the mode loading step by step to carry out, in certain top lifting height (1 ~ 10mm), by repeatedly adjusting the oil pressure of each group, can set one group of jacking oil pressure value, make jacking pressure and its upper load on each summit in a basic balance, by the measured value of every and calculated value comparison, calculate its measures of dispersion, jointly analyze reason by hydraulic engineer and structural engineer, finally organize a reference value while determining that can this measured value serve as jacking by leader, as differ greatly, to be adjusted accordingly.
E. determine and deliver for a check a little.
F. try jacking: in order to observe and examine the duty of whole jack-up construction system and the check to weighing results, before formal jacking, should try jacking, after examination jacking finishes, provide the situations such as overall attitude, displacement structure, for formal jacking provides foundation.
D. formal jacking.
(4) connect high construction, bridge jacking carries out abutment and props up that seated connection is high builds after completing, and new impost connects height and builds.
(5) bearing is installed: the high part of concrete joint has been constructed, and concrete curing reaches after design strength, erection support, and beam falls.
After bearing is installed, next just carry out bridge check in place, recover bridge floor and connect, remove the operations such as jacking temporary structure, these are all the conventional operations of bridge jacking, have not just repeated here.
Wherein the precedence of step (1) and step (2) is interchangeable, that is to say that pallet beam also can build before building jacking base and limited post.
Further, described limited post inner side is provided with steel plate, correspondingly, the inner side of described pallet beam spacing hole is also provided with steel plate, on the contact surface of two block plates, scribble lubrication oil, can reduce like this sliding friction between limited post and pallet beam, facilitate the carrying out of arch bridge jacking.In arch bridge jacking process, the force of sliding friction between limited post and pallet beam is mainly from the friction of the medial surface of limited post medial surface and pallet beam spacing hole.Do not establish steel plate, between pallet beam and limited post, in fact CONTACT WITH FRICTION is exactly the CONTACT WITH FRICTION between concrete surface and concrete surface, and frictional resistance obviously will be much larger than the CONTACT WITH FRICTION between steel plate.
Further, before and after described limited post, both sides are provided with steel plate, and correspondingly, the both sides, front and back of described pallet beam spacing hole are also provided with steel plate, are so also in order to reduce the sliding friction between limited post and pallet beam.
Further, the face of described pallet beam spacing hole and described limited post CONTACT WITH FRICTION is provided with polytetrafluoroethylene (PTFE) carriage, and contact surface is provided with the steel plate that is inlaid with polyfluortetraethylene plate, and polyfluortetraethylene plate protrudes from surface of steel plate.Like this, in arch bridge jacking process, between pallet beam and limited post, CONTACT WITH FRICTION has in fact just become the CONTACT WITH FRICTION between polyfluortetraethylene plate or between polyfluortetraethylene plate and steel plate.
The invention has the advantages that simple to operately, safe, power transmission is clear and definite; Though jacking rear arch is across slightly reducing, jacking rear abutment base integral in place is good, and overall safety degree is higher than former design; And construction period, without tensioned prestressing bar, has been saved the cutting of the stretch-draw scope of operation; Need not close a road to traffic, not affect highway and normally move.
Accompanying drawing explanation
Fig. 1 is the former arch bridge structure schematic diagram of embodiment;
Fig. 2 is the construction method flow chart of embodiment;
Fig. 3 is the arch bridge modeling force analysis figure of embodiment;
Fig. 4 is the front elevation of the jacking of embodiment;
Fig. 5 is the front sectional drawing of the jacking of embodiment;
Fig. 6 is the jack location arrangements plan view of embodiment;
Fig. 7 is the jack location arrangements side view of embodiment;
Fig. 8 is the pallet beam plan view of embodiment;
Fig. 9 is elevation after the jacking of embodiment.
Description of symbols in figure: 1-main arch, the 21-the first arch rib, the 22-the second arch rib, 3-jacking base, 31-former impost, 32-expansion position, 4-abutment, 41-abutment bearing, 5-basic end face, 6-limited post, 61-limited post front and back sides steel plate, 62-limited post medial surface steel plate, 7-pallet beam, 71-spacing hole front and back sides steel plate, 72-spacing hole medial surface steel plate, 73-spacing hole, 8-jack, 9-supporting steel pipe, 10-impost connects high part, and 11-abutment connects high part.
The specific embodiment
Below in conjunction with specific embodiment and Figure of description, the present invention is further described.
What the arch bridge for the treatment of jacking was certain speedway is upper across pedestrian overcrossing, and its structure is Deck Arch Bridges.49.59 meters of overall length of bridge, main span is 36.6 meters, and bridge is wide 5.5 meters, and class of loading is highway-II level.Superstructure has been adopted C40 steel bar concrete, support cast-in-place, and mortar flag stone chute is established in abutment both sides.Now, due to headroom deficiency, need carry out jacking to its entirety, top lifting height is 1.4 meters.
As shown in Figure 1, before arch bridge jacking, first to carry out Construction Scheme and demonstration and carry out some preparations of construction.
One, Construction Scheme and demonstration
Horizontal force size:
1, vertical muscle calculates
Be subject to flanging to join 3C20 by being configured in
A limited post is selected 10C25, As=4909
Meet the demands.
2, stirrup calculates
It is F=883kN that bottom is subject to shearing,
Meet the demands.
Select the two limb hoops of C10300,
Meet minimum and join hoop requirement.
Meet the demands.
Two, pallet beam checking computations
Resistance to compression is calculated
,pallet beam horizontal direction force
Therefore resistance to compression meets the demands.
Only need to press constructional reinforcement.
Two, preparation of construction
Comprise the preparation of construction work that fence setting, place layout etc. are conventional, these have not just described in detail.Soil excavation requires arch bridge base position to be excavated to concrete foundation end face 5.
Three, build jacking base 3, limited post 6 and pallet beam 7
1. build jacking base 3 and limited post 6: concreting carries out Longitudinal Extension processing to former impost 31 to bridge inner side, new impost length after expansion is greater than the distance of the first arch rib 21 outsides to the second arch rib 22 inner sides, between expansion position 32 and former basis, former impost 31, answer dabbing, the concavo-convex degree of depth is not less than 6mm, new impost after extension process is as jacking base 3, jacking base 3 is counter-force bases of arch bridge jacking, arch bridge jacking in place after and upper tray beam 7 connect into entirety; Two limited posts 6 and jacking base 3 monobloc casts, limited post 6 is the rectangular-shaped concrete column perpendicular to jacking base 3 upper surfaces, its inner surface is provided with the stainless-steel sheet 62 that 10mm is thick, both sides is provided with steel plate 61 before and after it, the length of limited post 6 is respectively 1500mm, 800mm, 2600mm, and it is high that limited post 6 cylinder vertical missings are not more than one thousandth post.
2. build pallet beam 7: above impost, build pallet beam 7, while building pallet beam 7, first in the first arch rib 21, the second arch rib 22 and main arch 1, to burrow to join and indulge muscle concreting again.Pallet beam 7 is rectangular-shaped concrete platform, and length is respectively 5680mm, 3500mm, 600mm, and its outer end end points is in the first arch rib 21 outsides, and its inner end points is in the inner side of the main arch 1 of same level, and its width is greater than the width of arch rib.Gap between pallet beam 7 and jacking base 3 is used for laying jack 8, its highly about 600mm, and in the present embodiment, suspended ceiling steel plate thickness is that 4cm, jack 8 are highly for 40cm, tool-type pad thickness are that 10cm, reserved operating space height are 2-5cm.Pallet beam 7 inside are provided with two spacing holes 73, limited post 6 is through spacing hole 73, quantity, size, the position distribution of quantity, size, position distribution and the limited post 6 of spacing hole 73 match, the inner side of spacing hole 73 is provided with the steel plate 72 that 10mm is thick, the front and back both side surface of spacing hole is provided with steel plate 71, on steel plate 72, protrudes and is inlaid with polyfluortetraethylene plate.
Four, integral jacking
1. cleaning shrinkage joint
Carefully check in shrinkage joint, jacking section two ends, whether have the foreign material, the especially concrete that hinder jacking before jacking, in order to avoid beam body is damaged when jacking.
If there is concrete in shrinkage joint, to chisel shrinkage joint with air compressor machine and extract rubber strip out, inspection box beam block contacts situation with casing, also cuts in the lump if desired, confirms that bridge is separated into absolute construction.
2. jack 8 and supporting steel pipe 9 are installed
(1) jack is arranged and supervising device
1) jack is arranged
A, anchor point place jack 8 are arranged: as calculated, jacking bridge weight is about 500 tons, do not have side to arrange altogether 6 row's Jacking points.Present every side anchor point place arranges 2 200 tons of hydraulic jack, 4 100t jack, and the top power of 1600 tons can be provided altogether, and its safety stock coefficient is 3.2, can meet top power demand;
B, abutment bearing 41 place's jack are arranged: through primary Calculation, the support reaction of abutment bearing 41 positions, both sides is about 10 tons, on present every side abutment bearing 41, arranges 2 100 tons of hydraulic jack, can meet top power demand;
Full-bridge is arranged 4 of 200 tons of hydraulic jack altogether, and 8 of 100 tons of hydraulic jack, can provide 1600 tons of top power altogether.
2) jack is installed
Jack is inverted, and bottom is connected on concrete bracket, installs before jack, checks smooth the bottom surface in the scope of installation jack.The axis that should guarantee jack when installation is vertical, produces horizontal component in order to avoid install to be tilted in jacking process because of jack.At the bottom of jack furred ceiling steel plate and beam, pad with wedge-shaped steel plate, at the bottom of beam, use high grade mortar levelling.
3) jack grouping
Every side anchor point is a control point, and full-bridge is established totally 4 control points altogether; A displacement monitoring sensor is all established in each control point.
4) jacking stroke monitoring: adopt the displacement transducer that precision is 0.01mm to monitor.
3. steel is installed to be supported
Steel brace foundation uses the pier after former pier or expansion, and between former pier shaft, stays 15cm space.When steel support is installed, to strictly control its verticality and be no more than 2%, prevent from occurring the situation of unstability in the time of jacking.
The special temporary steel cushion block of jacking be used in respectively under jack and temporary supporting under.Temporary steel cushion block is corresponding with the steel pipe of jacking bracket system, also adopts Φ 500 × 12mm steel pipe, and two ends welding is thick is the flange of 12mm.Steel cushion block has I, II, III, IV Four types, and for adapting to the jacking stroke of jack, the height of steel cushion block is respectively 100mm, 200mm.Each temporary supporting top all configures the steel plate that a pair of voussoir and thin and thick differ, to meet the requirement of different top rise.For avoiding supporting unstability in jacking process, between steel cushion block, connect by flange, in the time that cushion block height arrives 1.0 meters, increase by a joint steel pipe support in order to replace temporary cushion block, to strengthen stability of strutting system.Between braced structures, link firmly, between bolt between temporary cushion block, steel pipe support and jacking base 3 bolts, steel pipe support and be all connected with bolt between temporary cushion block.Guarantee that by above measure braced structures has good globality, prevent from causing because of the contingent slippage of bridge beam body jacking the unstable failure of support system.
Steel supports composition jacking bracket systems such as adopting accurately machined tool type steel pipe support, and bracket system is connected with jacking base 3 by the method for bar planting, and is unified into an entirety by bridging etc., has good globality and stability; Make to connect to an entirety in the support system jacking process of every side, increase the integral rigidity of synchronization of jacking up.
4. anchor point and bridge arch, wall cutting
After all preparation completes, jack is carried out to punching press 60%, make it tentatively stressed, then utilize rope saw to being connected between anchor point and bridge arch and impost carrying out cutting and separating, it is all thrown off.Cutting absolute altitude position between lifting platform and jacking base 3.
5. jacking is prepared
(1) jack-up system certificate authenticity
The certificate authenticity of element: the quality of element is the basis of mass of system, reliable for guaranteeing element, the element that native system is selected is quality product or the international top-brand product of Enerpac.Implement before jacking formal, by the pressurize 5 hours at the scene of the top lift with 70%-90%, reaffirm the reliability of sealing.
The reliability of system: hydraulic system is carried out the full loading test of 31.5MPa 24 hours transporting to before scene, carry out 0-31.5MPa cyclic test, makes system fault-free without leakage.
The cleannes of hydraulic oil: the cleannes of hydraulic oil are that system guarantees reliably, the design of native system and assembly technology, except in strict accordance with polluting the design criterion of controlling and technological requirement carries out, connecting hose is strictly being rinsed, after sealing, move to scene, scene installs carries out no-load running, to get rid of in site assembly process, and the dirt that may surprisingly sneak into.The cleannes of system should reach NAS9 level.
The stability of power closed loop: so-called power closed loop is exactly that the error of power is in 5% when default is well after certain power, and when power exceedes after this scope, system is adjusted to the scope of setting value automatically; Power closed loop is the basis of native system, and the debugging of power closed loop utilizes dead point pressurization, is undertaken by platform.
The stability of position closed loop: so-called position closed loop is exactly to set after top lifting height to grating scale when system, when exceeding this height system, top lifting height is automatically down to this height, when top lifting height rises to this height automatically lower than this height system, guarantee safety and the synchronism of system jacking.
(2) jacking control area is divided and hydraulic system layout
Control area is divided into 6 regions.The division principle at control point is that jacking process safety is reliable, the attitude control of the synchronism that stresses and pontic.
Control area arranges the synchronism of displacement transducer control displacement, and according to the structure of bridge, displacement synchronous precision is controlled at 2mm.Thereby being connected to form the closed-loop control of displacement, displacement transducer and central controller realize the accurate control of displacement in jacking process.
(3) pumping plant is installed
2 of jacking pumping plants make the economical rationality of jack oil length of tube as far as possible.
(4) jack-up system structure division checks
Whether a, jack are installed firmly vertical;
Whether b, lifting-up support are installed firm;
Whether c, position limiting structure are installed firm, and whether the spacing value value of establishing size meets the requirements;
D, affect the whether complete removal of facility of jacking;
Whether all e, agent structure were removed with being connected of other structure.
(5) jack-up system debugging
The main contents of debugging comprise:
A, hydraulic checking system;
B, control system inspection;
The setting of c, initial value with read.
6. weigh
(1) pressurize test
It is errorless that a, oil cylinder, oil pipe, pumping plant console, monitor etc. install inspection;
B, 70%～90% pressurization of pressing calculating load, carry out the pressurize of oil cylinder and test 5 hours;
The working condition of c, inspection whole system, oil circuit situation;
(2) weigh
A, for guaranteeing synchronously carrying out of jacking process, before jacking, should measure the actual loading at each Jacking point place
B, while weighing according to calculating jacking load, adopt the mode loading step by step to carry out, in certain top lifting height (1 ~ 10mm), by repeatedly adjusting the oil pressure of each group, can set one group of jacking oil pressure value, make the jacking pressure on each summit and its upper load in a basic balance.
C, for observe jacking place whether depart from, need measure its stroke with dial gage.
D, by the measured value of every and calculated value comparison, calculate its measures of dispersion, jointly analyze reason by hydraulic engineer and structural engineer, finally organize a reference value while determining that can this measured value serve as jacking by leader.As differ greatly, will be adjusted accordingly.
7. deliver for a check a little determine
On the bridge floor of each anchor point, get 3 monitoring points, 2 a bit, on center line, are respectively used to monitor absolute altitude and the midline position variation of jacking process Bridge in bridge floor both sides, and delivering for a check a little after finishing as jacking.Before jacking, should record relief initial value, so that jacking is checked after completing.
8. examination jacking
In order to observe and examine the duty of whole jack-up construction system and the check to weighing results, before formal jacking, should try jacking, examination top lifting height 10mm.
After examination jacking finishes, provide the situations such as overall attitude, displacement structure, for formal jacking provides foundation
9. formal jacking
After examination jacking, if observe no problem, just carry out formal jacking, jack range is 140mm, and each jacking standard stroke is 100mm, maximum jacking speed 10mm/min.
Five, connect high construction
After bridge jacking completes, carry out abutment bearing 41 and connect height and build, new impost connects height and builds.Connecing height is undertaken by following scheme:
Should be first before implementing to increase on truncation surface cut the concrete of 30cm left and right height, and column the old and new concrete bound fraction is carried out to surperficial dabbing processing, be beneficial to the connection of the old and new's concrete.After concrete cuts, must clean by water, must not leave dust and foreign material.
Reinforcement construction: according to former design drawing, increase main muscle and the stirrup welding of the quantity such as the employing of spreading part and original structure same specification.Reinforcing bar in arch rib is directly anchored at and newly waters in platform.
Template construction: steel form is by designing and producing, and " horn mouth " shape is made on top, to facilitate concrete building.
Concreting: 1. precast concrete block together in the time that Di Dun builds, 48 of concrete block size 200*200*200,4 of 200*200*240, now do temporary supporting when removing jack and steel pipe, the folded height of concrete block does four temporary support columns, directly pours into and connects in high concrete after removing jack and steel pipe.
2. connect high concrete and adopt slow setting, slightly expanded concrete, slow blowing in concrete casting process, and puddling reality is watered in layering.By total concrete consumption, extrapolate the height of building concrete, be one deck every 30cm left and right, guarantee the density of every layer of concrete smashing of water.
Six, bearing is installed
The high part of concrete joint has been constructed, and concrete curing reaches after design strength, gets final product erection support, and beam falls.
After bearing is installed, next just carry out bridge check in place, recover bridge floor and connect, remove the operations such as jacking temporary structure, these are all the conventional operations of bridge jacking, have not just repeated here.
Claims (4)
1. a construction method for arch bridge jacking, is characterized in that, comprises the following steps:
(1) build jacking base and limited post: arch bridge base position is excavated to concrete foundation end face, then concreting carries out Longitudinal Extension processing to former impost to bridge inner side, new impost length after expansion is greater than the distance of the first arch rib outside to the second arch rib inner side, between expansion position and former basis, former impost, answer dabbing, the concavo-convex degree of depth is not less than 6mm, and the new impost after extension process is as jacking base; Limited post and jacking base monobloc cast, limited post is the rectangular-shaped concrete column perpendicular to jacking base upper surface, it is high that limited post cylinder vertical missing is not more than one thousandth post;
(2) build pallet beam: above impost, build pallet beam, pallet beam is rectangular-shaped concrete platform, its outer end end points is in the first arch rib outside, and its inner end points is in the inner side of the main arch of same level, and its width is greater than the width of arch rib; Clearance height three's sum between arch bridge jacking overall height, pallet depth of beam and pallet beam and jacking base equals the height of limited post; Clearance height between pallet beam and jacking base equals suspended ceiling steel plate thickness, jack height, tool-type pad thickness and reserved operating space height sum; Pallet beam inside is provided with spacing hole, and quantity, size, the position distribution of quantity, size, position distribution and the limited post of spacing hole match;
(3) integral jacking:
A. clear up behind shrinkage joint, on jacking base, arrange, install several jack and supporting steel pipe, arrange, install several jack at abutment bearing place;
B. after all preparation completes, jack is carried out to punching press 60%, make it tentatively stressed, then utilize rope saw to being connected between anchor point and bridge arch and impost carrying out cutting and separating, it is all thrown off, cutting absolute altitude position between lifting platform and jacking base;
C. check the reliability of jack-up system;
D. weigh;
E. determine and deliver for a check a little;
F. try jacking;
D. formal jacking;
(4) connect high construction, after bridge jacking completes, carry out abutment and prop up that seated connection is highly built, new impost connects height and builds;
(5) bearing is installed: the high part of concrete joint has been constructed, and concrete curing reaches after design strength, erection support, and beam falls;
Wherein the precedence of step (1) and step (2) is interchangeable.
2. the construction method of a kind of arch bridge jacking as claimed in claim 1, is characterized in that, described limited post inner surface is provided with steel plate, and correspondingly, the inner surface of described pallet beam spacing hole is also provided with steel plate, on the contact surface of two block plates, scribbles lubrication oil.
3. the construction method of a kind of arch bridge jacking as claimed in claim 1, is characterized in that, before and after described limited post, both side surface is provided with steel plate, and correspondingly, the front and back both side surface of described pallet beam spacing hole is also provided with steel plate.
4. the construction method of a kind of arch bridge jacking as claimed in claim 1, it is characterized in that, the face of described pallet beam spacing hole and described limited post CONTACT WITH FRICTION is provided with polytetrafluoroethylene (PTFE) carriage, be that contact surface is provided with the steel plate that is inlaid with polyfluortetraethylene plate, polyfluortetraethylene plate protrudes from surface of steel plate.
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| US4944492A (en) * | 1988-06-24 | 1990-07-31 | Matsuo Engineering Co., Ltd. | Wedge-type jack apparatus for raising structure while sustaining very large pressure due to same and temporarily supporting the structure |
| DE29707488U1 (en) * | 1997-04-25 | 1998-08-27 | Brühl, Markus, Dipl.-Ing., 56076 Koblenz | Scaffolding for the renovation of concrete bridges |
| CN101736704A (en) * | 2008-11-21 | 2010-06-16 | 上海天演建筑物移位工程有限公司 | Bridge jacking method |
| CN201538944U (en) * | 2009-11-20 | 2010-08-04 | 北京市市政工程管理处 | Bridge maintaining device |
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2012
- 2012-06-25 CN CN201210209726.7A patent/CN102704413B/en active Active
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| CN102704413A (en) | 2012-10-03 |
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