CN102704398A - Jacking construction method of capping beam - Google Patents
Jacking construction method of capping beam Download PDFInfo
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- CN102704398A CN102704398A CN2012100956196A CN201210095619A CN102704398A CN 102704398 A CN102704398 A CN 102704398A CN 2012100956196 A CN2012100956196 A CN 2012100956196A CN 201210095619 A CN201210095619 A CN 201210095619A CN 102704398 A CN102704398 A CN 102704398A
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Abstract
The invention relates to a technique of heightening a bridge, particularly to a jacking construction method of a capping beam. The jacking construction method of the capping beam comprises a jacking hydraulic cylinder arranged between the capping beam and a pier; the capping beam is jacked to a preset height by using the jacking hydraulic cylinder, and the capping beam is supported through a cushion block. The jacking construction method of the capping beam is characterized in that the cushion block comprises a follow-up cushion block, a temporary cushion block and a permanent cushion block. The method also comprises the following steps of: fixedly installing the follow-up block on the bottom of the capping beam near the jacking hydraulic cylinder, lastingly lifting and jacking the pier or the temporary cushion block arranged on the pier by the follow-up cushion block in the jacking process of the jacking hydraulic cylinder, wherein the jacking distance of the follow-up cushion block is the same as the jacking distance of the jacking hydraulic cylinder at any moment in the jacking process of the jacking hydraulic cylinder. The jacking construction method of the capping beam has the advantages of high safety reliability and good synchronism, maneuverability and overall load-bearing performance.
Description
Technical field
The present invention relates to bridge and add high-tech, be specifically related to a kind of bent cap jack-up construction method.
Background technology
In at present present river course, railway, the highway rebuilding, the headroom of bridge and existing linear and the newly-built bridge of bridge be linear, and problem such as to be connected be the difficult point problem in the transformation.Domestic many cross a rivers road super expressway bridge because under-clearance is not enough, is faced with the problem of transformation at present.For the transformation of old bridge, traditional method is old bridge to be removed rebuild, and this is with the labor financial resource and material resource, and construction period is long bigger to social influence.The bridge jacking technology has economical rationality as a kind of novel bridge renovation technique, short construction period, and the advantage less to social environment influence has the conventional method incomparable advantage.In order to reduce as far as possible to social influence, shorten construction period, even do not suspend traffic, need carry out jack-up construction to bridge.
At present, job practices commonly used in the bridge jacking technology is the hydraulic jack jacking, and especially in large-tonnage bridge jacking engineering, hydraulic lifting is a unique selection.The hydraulic jack system can provide powerful top lift, and whole hydraulic jack system is connected by oil pipe, so when jacking, can play a role jointly.Especially synchronization of jacking up technology of hydraulic jack integral jacking system is mature on the whole at present, adopts PLC Hydraulic Synchronizing control jacking successfully utilization in multinomial order engineering.Hydraulic lifting system itself is also as the support system in the bridge jacking engineering in engineering in the past.But there is very big risk in the hydraulic lifting system as support system: if occur letting out in the hydraulic pressure, accident such as oil pipe explosion, the safety of bridge jacking is on the hazard, even immeasurable security incident takes place during jacking.
A kind of automatic following support system and method in Chinese patent 200910046134, have been disclosed; Used in this patent and a kind ofly utilized motor-driven following support device to come to support for superstructure; Measure the distance between following support device and the superstructure through micrometer and controller, control motor rotating drive following support device is followed jacking automatically.The purpose of this method and this system design be when the hydraulic jack decompression as the supplemental support instrument, but have following shortcoming in actual use:
One, the mode that adopts micrometer to measure following support device and superstructure spacing in this method (system) is controlled following support device and is carried out jacking, and this design concept is difficult the realization in practice of construction.Be different from the machining technique field, in technical field of building construction, generally can't accomplish higher precision, the planeness of the bottom of superstructure is relatively poor relatively, in this kind environment, adopts micrometer bigger error can occur.
Even two cast aside above-mentioned error component, above-mentioned following support system still has the problem that can't be overcome.Because micrometer can't measure small distance, cause following support device to fit tightly superstructure and have a gap all the time.Like cut off value mentioned in this patent working example is 1mm, promptly mean the following support device jacking put in place the back and superstructure between still have the gap about 1 mm.Except that the above-mentioned gap that can't be overcome; Through experiment confirm, underpin following support system when stressed when jack-up hydraulic ram is stressed, when being transformed on the following support system along with upper load; Big displacement compression also can appear in following support device; The displacement compression analysis of causes has 2 points: one of which, following support system inside are to adopt mechanical whorl to carry, and bear the load on top through the elastic deformation of mechanical whorl, when the superstructure load is changed; The mechanical whorl parts are compressed, and produce a change in displacement value; Two, owing to the variation of stressed position of the fulcrum, the compressive strain of the superstructure that causes self because following support device can't initiatively follow up, can not be eliminated the deflection of superstructure self.When conversion was stressed, the load of thousands of tons of was transferred to the following support device place by the jack-up hydraulic ram place, and corresponding superstructure produces compressive strain.Can be drawn by above-mentioned principle, when conversion was stressed, superstructure can occur one and significantly fall, and the displacement stroke of this whereabouts is the summation that gap described above adds the top offset compression.Certainly, above-mentioned phenomenon exists equally when the cushion block of routine supports superstructure, but because jack-up hydraulic ram is received in the cylinder process, and load is changed gradually, so the process that superstructure falls is in supported state all the time.And when the jack-up hydraulic ram decompression falls after rise, load moment conversion, this moment, superstructure will fall to be close to the mode that does not have to support, and was breakneck and drop in the construction like this.
Three, plug-in servomotor is bigger on the following support device, makes that the following support device planar dimension is bigger, is difficult for during use installing.
Can know that by above argumentation there are the defective that necessarily can't overcome in actual use in this automatic following support system and method, be applied to and still have bigger risk in the bridge jacking construction.
Summary of the invention
The objective of the invention is weak point according to above-mentioned prior art; A kind of bent cap jack-up construction method is provided; This method is followed housing and is followed hydraulic jack through in the cushion block support system, setting up, and makes when the oil pressure of oil cylinder suddenly disappears through following hydraulic jack or following housing and still can effectively support top jacking bridge, avoid top bridge landing.
The object of the invention realizes being accomplished by following technical scheme:
A kind of bent cap jack-up construction method; Be included between bent cap and the bridge pier jack-up hydraulic ram is set; Utilize said jack-up hydraulic ram with said bent cap jacking to reservation height; And support for said bent cap through cushion block, it is characterized in that said cushion block comprises to follow cushion block, interim cushion block and permanent cushion block that this method also comprises the steps: the said cushion block of following of nearly said jack-up hydraulic ram place fixed installation in said bent cap bottom; Afterwards in said jack-up hydraulic ram jacking process; The said cushion block of following continues jacking and holds out against said bridge pier or place the interim cushion block on the said bridge pier, and any time in said jack-up hydraulic ram jacking process, the said cushion block jacking distance of following is identical with said jack-up hydraulic ram jacking distance.
Highly by repeatedly single jacking operation completion, the concrete steps of said single jacking are with said superstructure jacking to reservation:
Control described jack-up hydraulic ram jacking, and reaching the single jacking displacement H of reservation
0After stop jacking; In this simultaneously, the said cushion block of following continues to follow up and press said bridge pier or place the interim cushion block on the said bridge pier;
Control said jack-up hydraulic ram and receive cylinder, place interim cushion block at the corresponding said jack-up hydraulic ram of said bridge pier place afterwards;
Control said jack-up hydraulic ram jacking and hold out against said interim cushion block;
Control the said cushion block of following and shrink, said interim cushion block is placed at the corresponding said cushion block place that follows at said bridge pier.
Said jack-up hydraulic ram is set in one and follows in the inner chamber of housing; The said housing of following has the upper and lower stayed surface that is parallel to each other; Saidly go up the bottom that stayed surface fixedly is fitted in said bent cap, said stayed surface down has the opening of said inner chamber, and the jacking end of said jack-up hydraulic ram can stretch out from said opening part/fully in the said inner chamber of retraction; Highly by repeatedly single jacking operation completion, the concrete steps of said single jacking are with said superstructure jacking to reservation:
Control described jack-up hydraulic ram jacking, and reaching the single jacking displacement H of reservation
0After stop jacking; In this simultaneously, the said cushion block of following continues to follow up and press said bridge pier or place the interim cushion block on the said bridge pier;
Control said jack-up hydraulic ram and receive cylinder, place interim cushion block at the corresponding said stayed surface place that follows under the housing of said bridge pier afterwards;
Control the said cushion block of following and shrink, said following stayed surface of following housing compresses said interim cushion block;
Said interim cushion block is placed at the corresponding said cushion block place that follows at said bridge pier.
The said housing height of following is identical with the minimum constructive height of said jack-up hydraulic ram.
The said single jacking operation of carrying out for the first time is examination jacking operation, and receives in the cylinder step at the jack-up hydraulic ram of said examination jacking operation, and displacement decrement h appears in the hydraulic jack of following that writes down in each bridge pier place
n, and be the single jacking displacement H of the bridge pier of n with sequence number in the follow-up single jacking operation
nBe adjusted into H
0+ h
n
Each described cushion block of following is followed hydraulic jack and is constituted with the said identical balancing cylinder of hydraulic jack quantity of following by at least one; Wherein, Said pedestal and said bent cap of following hydraulic jack fixed, said piston rod applying of following the jacking end and the said balancing cylinder of hydraulic jack.
Said balancing cylinder is through oil pipe, distributor series connection.
Advantage of the present invention is following:
1, the hydraulic jack of following of the present invention adopts machinery to carry, and has avoided accidents such as hydraulic leak or sealing leakage of oil, has good safety reliability with respect to the hydraulic fluid compressing cylinder.
2, the hydraulic jack of following of the present invention adopts hydraulic-driven, follows the top when following jointly at Duo Tai, has guaranteed that many are followed the synchronism that the time spent is done on the top, verification experimental verification this point.The hydraulically powered top of following need not servomotor, thus less with respect to the Mechanical Driven scale of construction, be easy to install and use.
3, the contrast verification through testing for several times; This invention has very high safety reliability; Have good synchronism, operability and holistic resistant behavior, can suddenly disappear or still can effectively support the top bridge during oil pipe explosion as a kind of oil pressure at oil cylinder rises bridge; Avoid the supporting mechanism of following of top bridge landing, thereby reliable assurance is provided for the bridge jacking engineering safety.
Description of drawings
Accompanying drawing 1 is main bridge facade structures sketch map;
Accompanying drawing 2 is the horizontal structure sketch map;
Accompanying drawing 3 is the local enlarged diagram of accompanying drawing 1;
Accompanying drawing 4 is embodiment 2 structural behavior sketch mapes.
The specific embodiment
Through embodiment characteristic of the present invention and other correlated characteristic are done further explain below in conjunction with accompanying drawing, so that technician's of the same trade understanding:
Shown in Fig. 1-4, label 1-8 representes respectively: continuous box girder 1, bridge pier 2, follow housing 3, jack-up hydraulic ram 4, follow hydraulic jack 5, balancing cylinder 6, cushion block 7, permanent cushion block 8.
Embodiment 1:
Referring to Fig. 1-4, the superstructure of related bridge master bridge portion adopts three to stride variable cross-section prestressed concrete continuous box girder 1 in the present embodiment, and continuous box girder 1 bottom is supported through bridge pier 2, and bridge pier 2 is made up of two main piers and two abutment piers.Based on this structure; Present embodiment adopts direct lift-up method; Be the counter-force basis promptly with bridge pier 2; Jack-up hydraulic ram 4 is installed between bridge pier 2 (main pier and abutment pier) and continuous box girder 1 bottom, and through PLC computer Synchronization Control, the method for integral jacking case beam (part, case beam top need reinforce) realizes raising the purpose of main bridge bridge floor absolute altitude.
Construction technology mainly comprises the steps: in the present embodiment
A, select single jacking displacement H based on the actual clearance of bridge design parameter, design drawing and Dun Ding and continuous box girder 1
0, and based on this single jacking displacement H
0Select Lifting Equipment;
B, some jack-up hydraulic rams 4 (quantity depends on the weight of continuous box girder 1 and the load of jack-up hydraulic ram 4) are installed for continuous box girder 1 corresponding each bridge pier 2 place of the main bridge of waiting to construct;
C, PLC jacking control system control said jack-up hydraulic ram 4 jackings and pressurize, cut to realize separating of continuous box girder 1 and bridge pier 2 for the bearing bottom of bridge pier 2 afterwards;
D, some hydraulic jacks 5 of following are installed in the location of cut of continuous box girder 1 corresponding bridge pier 2; And on this location of cut, place the identical balancing cylinder 6 of quantity; Said pedestal of following hydraulic jack 5 is fixed at continuous box girder 1; Said balancing cylinder 6 is arranged in said below of following hydraulic jack 5 one to one, and some said balancing cylinders 6 are communicated with through oil pipe;
E, for continuous box girder 1 circulate, alternately jacking, until jacking to design height;
G, remove jack-up hydraulic ram 4, follow hydraulic jack 5 and balancing cylinder 6, afterwards bridge pier 2 is connect height.
Below set forth in detail for the practical implementation details of above-mentioned steps:
Among steps A, the B, in conjunction with the actual condition of bridge, optional carrying out handled for original bridge pier 2 as follows:
Like the headroom of existing Dun Ding and continuous box girder 1 hour, can carry out certain cutting to the pier heights of roofs, so that can adopt the bigger jack-up hydraulic ram of stroke 4, with raising single jacking displacement H
0Height.After finishing, cutting needs to adopt high-strength being in the milk to expect that concrete carries out levelling from levelling in the cutting bottom of Dun Ding.
Arrange from former post limit when nearer like jack-up hydraulic ram 4, for preventing bridge pier 2 splittings, to adopting overstriking, increasing mode such as steel hoop and carry out consolidation process for bridge pier 2.
During like the hollow position of the corresponding continuous box girder 1 of jack-up hydraulic ram 4 positions, consider that this position shearing resistance of continuous box girder 1 is not enough, should carry out consolidation process for continuous box girder 1 inside.Modes such as steel concrete are newly built in rib both sides as at continuous box girder 1.
For ease of jacking operation (cushion block 7 is had bad luck conveniently), all jack-up hydraulic rams 4 all are inverted by downward direction and are installed, and promptly the hydraulic jack base is fixed on jacking superstructure below, and jack-up hydraulic ram 4 rises with the rising of superstructure.Jack-up hydraulic ram 4 is fixed with continuous box girder 1, and the jacking end of jack-up hydraulic ram 4 separates with the Dun Ding of bridge pier 2.Jack-up hydraulic ram 4 should guarantee the axis normal of hydraulic jack when installing, in order to avoid produce horizontal component because of the hydraulic jack installation is tilted in the jacking process.The upper and lower side of jack-up hydraulic ram 4 should be placed steel plate.
Among the step C; Control jack-up hydraulic ram 4 is given the precharge of jacking position by 50% power of design load; After precharge is accomplished, to screwing on the jack-up hydraulic ram 4, after screw device is screwed from screw device; Close the power supply of hydraulic control system, this moment, the load of continuous box girder 1 had the hydraulic pressure of jack-up hydraulic ram 4 stressed jointly with the machinery ring.Cut for bearing bottom afterwards, and take fixing or sliding support away bridge pier 2.Concrete to the bearing bottom carries out levelling afterwards, and levelling is adopted high-strength from levelling grouting material.
Among the step D, it is to avoid when the oil pressure of jack-up hydraulic ram 4 suddenly disappears continuous box girder 1 landing that the purpose of following hydraulic jack 5 and balancing cylinder 6 is installed.Following hydraulic jack 5 is ordered about by the hydraulic-driven pumping plant and follows hydraulic jack and carry out work; Its inner mechanical whorl that adopts carries; Bear the load on top through the elastic deformation of mechanical whorl; Follow hydraulic jack 5 for passive stressed, promptly can bear bigger load, but and the active force that provides much smaller than bearing load.It should be noted that; Compare with documents, the active force of following hydraulic jack 5 can make it hold out against the counter-force basis, and offsets the deflection of a part self and the deflection of superstructure; When jack-up hydraulic ram 4 decompressions fall after rise; During load moment conversion, though superstructure still certain displacement can occur, the displacement of this moment is to receive the support of follow-up hydraulic oil cylinder 4.Follow the inner seal of hydraulic jack 5, be installed into flowline, oil pipe is connected to hydraulic power unit or is called on the control pumping plant.During jacking, open this pumping plant, the oil in the pumping plant gets into through oil pipe and follows in the hydraulic jack 5, follows the inner screw device of hydraulic jack 5 through oil pressure actuated, follows hydraulic jack 5 and follows up automatically; When receiving cylinder, oil return, the oil of following in the hydraulic jack 5 gets into pumping plant.The inside rotary power of following hydraulic jack 5 is provided by hydraulic power unit, through regulating rising and the decline that direction of rotation gets final product implement device.
Balancing cylinder 6 is identical with the quantity of following hydraulic jack 5; Follow the balancing cylinder 6 that stroke very little (about 2mm) put in hydraulic jack 5 belows for every; Balancing cylinder 6 specifications are identical, have oil pipe to be communicated with between each balancing cylinder 6, and said balancing cylinder 6 pressure equate during work.Follow the stress equalization that the offset deviation of rigidity between the support makes each strong point through increasing balancing cylinder 6 devices, can correcting automatically.Jacking load in top passes to balancing cylinder 6 through following hydraulic jack 5, and on the same group balancing cylinder 6 is through oil pipe UNICOM, guarantee on the same group to follow hydraulic jack 5 stressed evenly; Said balancing cylinder 6 strokes are very little, have oil pipe to be communicated with between each balancing cylinder 6, follow hydraulic jack 5 and use jointly with balancing cylinder 6.
Jack-up hydraulic ram 4 modes are identical with structure in the installation of following hydraulic jack 5 and the steps A, repeat no more at this.The Dun Ding that balancing cylinder 6 lies in a horizontal plane in bridge pier 2 gets final product.
Step e is main bridge jacking flow process, and concrete step is following:
Jack-up hydraulic ram 4 is according to single jacking displacement H
nCarry out jacking, follow hydraulic jack 6 and follow up automatically;
When single jacking displacement H is arrived in jack-up hydraulic ram 4 jackings
nAfter, jack-up hydraulic ram 4 stops jacking, follows hydraulic jack 5 and stops follow-up;
Jack-up hydraulic ram 4 is received cylinder; Following the stressed and compression of hydraulic jack 5 puts in place; On the same group follow hydraulic jack 5 through 6 groups of interior self-balancings of balancing cylinder; The whole loads of bridge are transformed into by jack-up hydraulic ram 4 and follow support system, and can be observed each balancing cylinder 6 and can find out that the cylinder diameter extension elongation is inconsistent this moment;
At the interim cushion block 7 of jack-up hydraulic ram 4 held;
After 4 times interim cushion blocks 7 of jack-up hydraulic ram placed, jack-up hydraulic ram 4 was stretched cylinder and is held out against interim cushion block 7, on the jack-up hydraulic ram 4 of screwing from screw device;
Control is followed hydraulic jack 5 and is rotated down, and contraction is kept in the center, and places permanent cushion block 8 following hydraulic jack 5 bottoms afterwards;
Control is afterwards followed hydraulic jack 5 and is held out against balancing cylinder 6;
Repeat above-mentioned steps, until jacking to a little more than design elevation (exceeding 2cm);
With screwing on the jack-up hydraulic ram 4 from screw thread; Hydraulic jack 5 is followed in dismounting, and pad is put permanent cushion block 8 and erection support, opening from screw thread on the jack-up hydraulic ram 4 then afterwards; Jack-up hydraulic ram 4 falls to design elevation; This moment, bearing was closely connected with permanent cushion block 8, removed jack-up hydraulic ram 4, and bridge pier 2 is connect height.
In the above-mentioned jacking step, when jack-up hydraulic ram 4 was received cylinders, promptly the stressed system of following that underpins of jack-up hydraulic ram 4 was when stressed.Follow 5 last times of hydraulic jack along with bridge load constantly is transformed into, follow hydraulic jack 5 and the displacement compression can occur, the displacement compression analysis of causes has 2 points:
One of which, because the variation of stressed position of the fulcrum, the compressive strain of the concrete box girder that causes self.Can initiatively follow up though follow hydraulic jack 5, follow-up power less (having only about 1.5KN) initiatively can not be eliminated the deflection of continuous box girder 1 self.When hydraulic jack is changed when stressed, the load of thousands of tons of is pressed onto gradually follows position, top 5 and puts the place, and corresponding top continuous box girder 1 structure produces compressive strain.
Be to fall to hang over continuous box girder 1 bottom through steel plate owing to following hydraulic jack 5 two,, the steel plate of new cartridge plate and former support position is installed through screw tightening.When load is changed gradually, between the new and old steel plate and the assemblage gap of following between hydraulic jack 5 and the new cartridge plate be compressed.
The single jacking operation of carrying out for the first time is used for observing this displacement compression as examination jacking operation, constantly accumulates when avoiding follow-up jacking operation.Jack-up hydraulic ram 4 in examination jacking operation is received in the cylinder step, write down the displacement decrement that hydraulic jack 4 produces of following on each bridge pier 2, and the sequence number n of corresponding bridge pier is designated as h
nIn with follow-up single jacking operation, sequence number is the single jacking displacement H of the bridge pier of n
nBe adjusted into H
0+ h
n
Embodiment 2:
Referring to Fig. 4, present embodiment 2 is with the difference of embodiment 1, is outside equipped with at jack-up hydraulic ram 4 and follows housing 3.The height of following housing 3 is identical with jack-up hydraulic ram 4 minimum constructive heights.The purpose that housing 3 is followed in setting is mainly to be number of times and the duration that reduces jack-up hydraulic ram 4 jackings and pressurize, further improves the security performance of whole jack-up system.
Follow housing 3 and have the upper and lower stayed surface that is parallel to each other, and have the cavity that at least one vertical said upper and lower stayed surface is provided with, said cavity has the opening that is positioned on the said stayed surface down; Following hydraulic jack 4 is set in the said cavity; The said housing 3 of following is individually fixed in said superstructure (continuous box girder 1) bottom or the two Joint and integral installation in said superstructure (continuous box girder 1) bottom with the said hydraulic jack 4 of following, and fits in said upward stayed surface and said superstructure (continuous box girder 1) bottom; Said jacking end of following hydraulic jack 4 can stretch out from said opening/fully in the said cavity of retraction.
The spacing of following between the upper and lower stayed surface of housing 3 is identical with said jack-up hydraulic ram 4 minimum constructive heights.
Corresponding, single jacking step changes among the embodiment 2, and its concrete steps are following:
Control described jack-up hydraulic ram 4 jackings, and reaching the single jacking displacement H of reservation
0After stop jacking; In this simultaneously, following hydraulic jack 5 continues to follow up and press bridge bridge pier 2 or place the permanent cushion block 8 on the bridge pier;
Control said jack-up hydraulic ram 4 and receive cylinder, place interim cushion block 7 at corresponding said 3 times stayed surface places of housing that follow, said counter-force basis afterwards;
Control the said hydraulic jack 5 of following and receive cylinder, superstructure power underpined and followed housing 3 this moment, and the following stayed surface of following housing 3 compresses said interim cushion block 7;
When next single jacking step, control is simultaneously followed hydraulic jack 5 and is got final product with jack-up hydraulic ram 4 jackings.
Can find out by above-mentioned steps, compare, reduce jack-up hydraulic ram 4 among the embodiment 2 and stretched the step that cylinder holds out against interim cushion block 7 with embodiment 1.
Claims (7)
1. bent cap jack-up construction method; Be included between bent cap and the bridge pier jack-up hydraulic ram is set; Utilize said jack-up hydraulic ram with said bent cap jacking to reservation height; And support for said bent cap through cushion block, it is characterized in that said cushion block comprises to follow cushion block, interim cushion block and permanent cushion block that this method also comprises the steps: the said cushion block of following of nearly said jack-up hydraulic ram place fixed installation in said bent cap bottom; Afterwards in said jack-up hydraulic ram jacking process; The said cushion block of following continues jacking and holds out against said bridge pier or place the interim cushion block on the said bridge pier, and any time in said jack-up hydraulic ram jacking process, the said cushion block jacking distance of following is identical with said jack-up hydraulic ram jacking distance.
2. a kind of bent cap jack-up construction method according to claim 1 is characterized in that: highly by repeatedly single jacking operation completion, the concrete steps of said single jacking are with said superstructure jacking to reservation:
Control described jack-up hydraulic ram jacking, and reaching the single jacking displacement H of reservation
0After stop jacking; In this simultaneously, the said cushion block of following continues to follow up and press said bridge pier or place the interim cushion block on the said bridge pier;
Control said jack-up hydraulic ram and receive cylinder, place interim cushion block at the corresponding said jack-up hydraulic ram of said bridge pier place afterwards;
Control said jack-up hydraulic ram jacking and hold out against said interim cushion block;
Control the said cushion block of following and shrink, said interim cushion block is placed at the corresponding said cushion block place that follows at said bridge pier.
3. a kind of bent cap jack-up construction method according to claim 1; It is characterized in that: said jack-up hydraulic ram is set in one and follows in the inner chamber of housing; The said housing of following has the upper and lower stayed surface that is parallel to each other; Saidly go up the bottom that stayed surface fixedly is fitted in said bent cap, said stayed surface down has the opening of said inner chamber, and the jacking end of said jack-up hydraulic ram can stretch out from said opening part/fully in the said inner chamber of retraction; Highly by repeatedly single jacking operation completion, the concrete steps of said single jacking are with said superstructure jacking to reservation:
Control described jack-up hydraulic ram jacking, and reaching the single jacking displacement H of reservation
0After stop jacking; In this simultaneously, the said cushion block of following continues to follow up and press said bridge pier or place the interim cushion block on the said bridge pier;
Control said jack-up hydraulic ram and receive cylinder, place interim cushion block at the corresponding said stayed surface place that follows under the housing of said bridge pier afterwards;
Control the said cushion block of following and shrink, said following stayed surface of following housing compresses said interim cushion block;
Said interim cushion block is placed at the corresponding said cushion block place that follows at said bridge pier.
4. a kind of bent cap jack-up construction method according to claim 3 is characterized in that: the said housing height of following is identical with the minimum constructive height of said jack-up hydraulic ram.
5. according to claim 2 or 3 described a kind of bent cap jack-up construction methods; It is characterized in that: the said single jacking operation of carrying out for the first time is examination jacking operation; And the jack-up hydraulic ram in said examination jacking operation is received in the cylinder step, and displacement decrement h appears in the hydraulic jack of following that writes down in each bridge pier place
n, and be the single jacking displacement H of the bridge pier of n with sequence number in the follow-up single jacking operation
nBe adjusted into H
0+ h
n
6. a kind of bent cap jack-up construction method according to claim 1; It is characterized in that: each described cushion block of following is followed hydraulic jack and is constituted with the said identical balancing cylinder of hydraulic jack quantity of following by at least one; Wherein, Said pedestal and said bent cap of following hydraulic jack fixed, said piston rod applying of following the jacking end and the said balancing cylinder of hydraulic jack.
7. a kind of bent cap jack-up construction method according to claim 6 is characterized in that: said balancing cylinder is through oil pipe, distributor series connection.
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| CN201210095619.6A CN102704398B (en) | 2012-04-01 | 2012-04-01 | Jacking construction method of capping beam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108505453A (en) * | 2018-07-04 | 2018-09-07 | 重庆三峡学院 | A kind of Bridge Rotation Construction Technique balance lifting seat |
| CN114481832A (en) * | 2020-11-13 | 2022-05-13 | 佳彧机械工程有限公司 | Wedge-shaped propelling device for bridge and construction method thereof |
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