CN108867411A - System bridge jacking system and its construction method are underpined based on detachable prestressing force - Google Patents

Abstract

The present invention relates to the technical field of bridge jacking device, including support plug-in type scaffold, adjustable anchor ear pre-loaded support struts platform, regularization bent cap connects high form-tie assembly and horizontal limit devices.Support is fixed on plug-in type scaffold to be expanded on cushion cap, is connected using pre-embedded anchoring bolts, and scaffold realizes vertical bar, the quick connection of cross bar and brace by connecting sleeve.Adjustable anchor ear pre-loaded support struts platform is formed using two pieces of double concave slots, is reduced using cushion cap as the construction volume of counter-force platform.It includes side form that regularization bent cap, which connects high-supported formwork, holds mould and stretching notch template, realizes quickly connection by concave-convex tongue and groove and connecting rod.Horizontal limit devices setting is in bridge floor board ends, and by limit truss, supporting block, for the track of supporting block sliding, fixed plate and cross spacing jack are formed.When lateral shift occur in floorings, by the progress of cross spacing jack, gradually fine tuning is corrected.

Description

System bridge jacking system and its construction method are underpined based on detachable prestressing force

Technical field

The present invention relates to a kind of jack-up systems, and in particular to one kind underpins system bridge jacking based on detachable prestressing force System and its construction method.

Background technique

The development of current economic society, land resource is relatively in short supply, is then spatially had become using resource and is worked as Lower trend.The features such as space under bridge is wide with its Utilization prospects, exploitation facilitates receives multi-party concern.This is just needed to original Short bridge carries out lifting construction, to meet the requirement such as subsequent under-clearance.

Existing bridge jacking technology presses the column that whether breaks, and can be divided into disconnected pillar jack lifting technique and non-disconnected pillar jack lifting technique. The former mainly has upper and lower thick pillar beam type, lower thick pillar beam-bent cap formula, cushion cap-bent cap formula and cushion cap-thick pillar beam type；The latter includes straight Connect jacking type and corbel type construction technology.But the construction of existing bridge jacking haves the defects that certain, for example thick pillar back liter applies Work is used as counter-force platform, and bearing capacity is smaller, can not be applied to directly jack from great bridge structure, to entire construction meeting Biggish workload is brought, compared with thick pillar girder construction, economy is poor.

In conclusion one kind of seeking quasi- at present is based on thick pillar girder construction, using prestressing technique, detachably, to former pier stud Or bridge structure does not affect greatly, and accuracy is high underpins system bridge based on detachable prestressing force for lifting construction Jack-up system and its construction method just seem particularly significant.

Summary of the invention

The purpose of the present invention is to solve the above problems, provide one kind based on detachable prestressing force and underpin system bridge Jack-up system and its construction method.

In order to achieve the above object of the invention, the present invention uses following technical scheme：

One kind underpining system bridge jacking system based on detachable prestressing force, including carries out expansion processing to the original cushion cap of bridge Obtained expansion cushion cap expands and is equipped with pre-embedded anchoring bolts on cushion cap in advance, expands and is pacified on cushion cap by pre-embedded anchoring bolts Fill support plug-in type scaffold；Support, which is used, installs adjustable anchor ear pre-loaded support struts platform as bridge top on plug-in type scaffold Rise counter-force platform；Bridge include bent cap and on bent cap bridge to be jacked floorings, in installing sizing on the bent cap of bridge Change bent cap and connects high form-tie assembly；Adjustable anchor ear pre-loaded support struts platform is equipped with several jacks and servo bracket, jacking At the top of jack and servo bracket and floorings bottom is forced contact；It further include the jacking control system on scaffold, Jack is unified to be controlled by jacking control system；Floorings are equipped with stress monitoring device and level monitoring device, bent cap are equipped with Horizontal limit devices for being limited to floorings in transverse direction.

Preferably, support plug-in type scaffold is set by the vertical bar, horizontally disposed cross bar and diagonal cross being vertically arranged The brace set is built into concave shape, is connected as one between two vertical bars by connecting sleeve, and cross bar both ends setting cross bar L-type connects Head, L-type slot is arranged in connecting sleeve, and cross bar both ends are connect by cross bar L-type connector and the cooperation of L-type slot with connecting sleeve；Brace Brace connector is arranged in end, and brace connecting rod is arranged in connecting sleeve, and brace both ends are cooperated by connector and brace connecting rod It is connect with connecting sleeve.

Preferably, for L-type slot position in the middle part of connecting sleeve, brace connecting rod is located at the upper and lower part of connecting sleeve, tool Body is that connecting sleeve is equipped with swivel becket, and brace connecting rod is set on swivel becket.

Preferably, the Eight Character trough of splayed structure is set on swivel becket, and brace connecting rod passes through the limited company in the Eight Character trough tail portion It is connected to the Eight Character trough, connecting sleeve and swivel becket corresponding position are equipped with several tooth mouths, and swivel becket is provided with embedded fixed jaw, swivel becket Cooperation by embedding fixed jaw and tooth mouth is limitedly rotated relative to connecting sleeve；Swivel becket is equipped with high-strength bolt, embeds and fixes Pawl is fixed on swivel becket by high-strength bolt.

Preferably, expanded metal lath is equipped on cross bar, brace connecting rod is made of tapped fine steel tube.

Preferably, regularization bent cap connects high form-tie assembly and is made of side form, end mould, tensioning Side Template and side form support；End Mould and tensioning Side Template are reserved with the hole passed through for bellows and presstressed reinforcing steel；Side form, end mould, the end of tensioning Side Template are equal Equipped with concave-convex tongue and groove, side form is held mating connection bar between mould, tensioning Side Template and is connected by concave-convex tongue and groove；Side form support packet Extension sleeve and support backing plate are included, support backing plate is arranged on side form, and extension sleeve one end is supported on support backing plate, the other end It is fixed on scaffold.

Preferably, side form, end mould, tensioning Side Template enclose and form a construction space after the completion of setting, and in this construction space Steel reinforcement cage, bellows and presstressed reinforcing steel are installed, several side form fixation holes is installed on side form, is previously implanted several steel on bent cap Muscle simultaneously cooperates side form fixation hole to support formwork system.

Preferably, concave-convex tongue and groove includes sub-portion and mother portion, and is respectively arranged on the different components being attached, including son Portion is equipped with several insertion columns, and female portion is equipped with several insertion holes to match with sub-portion, and side form, end mould, tensioning Side Template pass through son Portion is inserted into mother portion and realizes interconnection；Concave-convex tongue and groove is equipped with the circular hole to match with connecting rod, and connecting rod is inserted into corresponding hole Realize the connection between concave-convex tongue and groove.

Preferably, horizontal limit devices include limit truss, supporting block and fixed plate, and limit truss is equipped with track, branch Bracer is slidably connected by track and limit truss, equipped with limit jack and very heavy by limiting between supporting block and fixed plate Top connection, fixed plate are installed on floorings both ends of the surface.

Preferably, stress monitoring device is arranged in the lower surface of floorings, and level monitoring device is arranged in the upper surface of floorings, Level monitoring device is located at servo bracket and floorings bottom span centre position.

Preferably, floorings bottom is equipped with bridge bottom distribution beam, contacts at the top of jack with bridge bottom distribution beam bottom.

It is a kind of based on underpining applying for system bridge jacking system based on detachable prestressing force described in the claims Work method, includes the following steps：

The first step：It is to excavate ground, exposes the cushion cap below pier stud, expansion construction is carried out to it, by design requirement formwork, is laid with Reinforcing bar, casting concrete, and pre-embedded anchoring bolts are set in advance, finally obtain expansion cushion cap；

Second step：It is to expand by vertical bar above cushion cap, cross bar, brace and connecting sleeve build support and constructed with plug-in type Frame, and it is laid with expanded metal lath；Support is fixed with plug-in type scaffold bottom with the pre-embedded anchoring bolts expanded on cushion cap；

Third step：It is to jack counter-force platform using two pieces of double concave slot construction bridges；Rubber pad is laid on pier stud first, then Two pieces of double concave slots are hung to estimating position with loop wheel machine, the worker on coordinative construction frame realizes and tentatively fixes, and then in concave-concave Installation steel reinforcement cage and presstressed reinforcing steel in shape slot, and stretching construction is first carried out, last casting concrete obtains adjustable anchor ear prestressing force Support platform；

4th step：It is that the support being first released between floorings and bent cap is fixed, then in adjustable anchor ear pre-loaded support struts platform Upper arrangement jack and tunnel bracket, and then in floorings sole arrangement bridge bottom distribution beam；

5th step：It is to arrange level monitoring point and stress monitoring point in floorings above and below, is arranged in floorings both ends of the surface horizontal To limiting device, jack-up construction is carried out by jacking control system immediately；

6th step：It is to carry out formwork in bent cap surrounding, and side form support is installed, then after floorings are jacked to predetermined altitude Steel reinforcement cage, bellows and presstressed reinforcing steel are installed in the space that template surrounds, and reserved slip casting duct；And then coagulation is poured Soil and progress stretching construction, that completes bent cap connects high construction；New support is finally installed between bent cap and floorings with fixed bridge Panel.

Compared with prior art, the present invention beneficial effect is：

（1）The horizontal limit devices that the present invention develops ensure that during floorings jacking, lateral displacement will not occur.

（2）The present invention completes the connection that bent cap connects high template using concave-convex tongue and groove mating connection bar, can fast implement mould The installation of plate, the connecting sleeve of research and development can be convenient the connection installation of scaffold, greatly improve construction efficiency.

（3）The support that the present invention researches and develops plug-in type scaffold can also be to adjustable armful except the operation that can facilitate construction personnel It binds round pre-loaded support struts platform and support is provided, guarantee its load.

Detailed description of the invention

Fig. 1 is bridge jacking construction schematic diagram；

Fig. 2 is to expand cushion cap front view；

Fig. 3 is double concave slot top view；

Fig. 4 is adjustable anchor ear pre-loaded support struts platform cross-sectional view；

Fig. 5 is support plug-in type scaffold structure front view；

Fig. 6 is cross bar L-type connector, brace connector schematic diagram；

Fig. 7 is connecting sleeve schematic diagram；

Fig. 8 is horizontal limit devices structural schematic diagram；

Fig. 9 is horizontal limit devices arrangement schematic diagram；

Figure 10 is template catenation principle figure；

Figure 11 is that bent cap connects high construction sectional view.

In figure：1 pier stud, 2 bent caps, 3 floorings, 4 supports, 5 jacks, 6 supporting blocks, 7 cushion caps, 8 expansion cushion caps, 9 Support plug-in type scaffold, 10 pre-embedded anchoring bolts, 11 adjustable anchor ear pre-loaded support struts platforms, 12 double concave slots, 13 answer in advance Power muscle, 14 anchorages, 15 steel reinforcement cages, 16 rubber pads, 17 concrete, 18 servo brackets, 19 side forms, 20 end moulds, 21 tensioning Side Templates, 22 bridge bottom distribution beams, 23 concave-convex tongue and grooves, 24 connecting rods, 25 side form fixation holes, 26 tracks, 27 side forms, 28 extension sleeves of support, 29 Support backing plate, 30 bellowss, 31 slip casting ducts, 32 vertical bars, 33 cross bars, 34 braces, 35 connecting sleeves, 36L type groove, 37 cross bar L Type joint, 38 brace connectors, 39 brace connecting rods, 40 expanded metal laths, 41 swivel beckets, 42 the Eight Character troughs, 43 tooth mouths, 44 fixed jaws, 45 high-strength bolts, 46 level monitoring points, 47 stress monitoring points, 48 horizontal limit devices, 49 limit truss, 50 fixed plates, 51 Cross spacing jack, 52 jacking control systems.

Specific embodiment

Below by specific embodiment the technical scheme of the present invention will be further described explanation.

If raw material employed in the embodiment of the present invention is raw material commonly used in the art without specified otherwise, implement Method employed in example, is the conventional equipment and conventional method of this field.

One kind underpining system bridge jacking system based on detachable prestressing force, as shown in Figure 1-Figure 11, including to bridge Original cushion cap 7 carries out the expansion cushion cap 8 that expansion is handled, and expands and is equipped with pre-embedded anchoring bolts 10 in advance on cushion cap 8, expands Support plug-in type scaffold 9 is installed by pre-embedded anchoring bolts 10 on cushion cap 8；Installation can on support plug-in type scaffold 9 Anchor ear pre-loaded support struts platform 11 is adjusted to be used as bridge jacking counter-force platform；Bridge includes bent cap 2 and the bridge to be jacked on bent cap 2 The floorings 3 of beam connect high form-tie assembly in installing regularization bent cap on the bent cap 2 of bridge；Adjustable anchor ear pre-loaded support struts platform 11 are equipped with several jacks 5 and servo bracket 18, jack 5 and the top of servo bracket 18 and 3 bottom of floorings For forced contact；It further include the jacking control system 52 on scaffold, jack 5 is unified by jacking control system 52 Control；Floorings 3 be equipped with stress monitoring device 47 and level monitoring device 46, bent cap 2 be equipped with for floorings 3 in lateral progress The horizontal limit devices 48 of limit.

Adjustable anchor ear pre-loaded support struts platform 11 be it is assembled by two double concave slots 12, double concave slot 12 offers The semicircle that at least two semicircles, semicircle and bridge pier match, the quantity and bridge pier cooperating number of semicircle；When two double concave slots 12 are spelled After dress, two semicircular rings are arranged around bridge pier, then, using presstressed reinforcing steel 13 and anchorage 14 by assembled 12 liang of latter two double concave slot Side fastens obvolvent, forms adjustable anchor ear pre-loaded support struts platform 11.So-called double concave slot 12, specifically hollow shell make Two double concave slots 12 splice after form that one hollow and tool there are five the rectangular parallelepiped structure in face, as adjustable anchor ear prestressing force Support platform 11

Support plug-in type scaffold 9 is arranged oblique by the vertical bar 32, horizontally disposed cross bar 33 and diagonal cross that are vertically arranged Bar 34 is built into concave shape, is connected as one between two vertical bars 32 by connecting sleeve 35, cross bar L-type is arranged in 33 both ends of cross bar L-type slot 36 is arranged in connecting sleeve 35 for connector 37, and 33 both ends of cross bar are by cross bar L-type connector 37 and the cooperation of L-type slot 36 and connect Casing 35 connects；Brace connector 38 is arranged in 34 end of brace, and brace connecting rod 39 is arranged in connecting sleeve 35, and 34 both ends of brace are logical It crosses connector 38 and the cooperation of brace connecting rod 39 is connect with connecting sleeve 35.L-type slot 36 is located at the middle part of connecting sleeve 35, brace Connecting rod 39 is located at the upper and lower part of connecting sleeve 35, and specifically connecting sleeve 35 is equipped with swivel becket 41, brace connecting rod 39 On swivel becket 41.

The Eight Character trough 42 of splayed structure is set on swivel becket 41, and brace connecting rod 39 passes through the limited company in 42 tail portion of the Eight Character trough It is connected to the Eight Character trough 42, connecting sleeve 35 and 41 corresponding position of swivel becket are equipped with several tooth mouths 43, and swivel becket 41 is provided with interior build-in Determine pawl 44, swivel becket 41 is limitedly rotated relative to connecting sleeve 35 by embedding fixed jaw 44 and the cooperation of tooth mouth 43；Swivel becket 41 are equipped with high-strength bolt 45, and embedded fixed jaw 44 is fixed on swivel becket 41 by high-strength bolt 45.

Expanded metal lath 40 is equipped on cross bar 33, brace connecting rod 39 is made of tapped fine steel tube.

Regularization bent cap connects high form-tie assembly and is made of side form 19, end mould 20, tensioning Side Template 21 and side form support 27；End Mould 19 and tensioning Side Template 21 are reserved with the hole passed through for bellows 30 and presstressed reinforcing steel 13；Side form 19, end mould 20, stretching end The end of template 21 is equipped with concave-convex tongue and groove 23, and side form 19 is held mating connection bar 24 between mould 20, tensioning Side Template 21 and passed through Concave-convex tongue and groove 23 connects；Side form support 27 includes extension sleeve 28 and support backing plate 29, and support backing plate 29 is arranged on side form 19, 28 one end of extension sleeve is supported on support backing plate 29, and the other end is fixed on scaffold 9.

Side form 19, end mould 20, tensioning Side Template 21 enclose and form a construction space after the completion of setting, and pacify in this construction space Steel reinforcement cage 15, bellows 30 and presstressed reinforcing steel 13 are filled, is installed with several side form fixation holes 25 on side form 19, on bent cap 2 in advance Implantation several bars simultaneously cooperate side form fixation hole 25 to support formwork system.

Concave-convex tongue and groove 23 includes sub-portion and mother portion, and is respectively arranged on the different components being attached, including in sub-portion Equipped with several insertion columns, female portion is equipped with several insertion holes to match with sub-portion, and side form 19, end mould 20, tensioning Side Template 21 pass through Sub-portion is inserted into mother portion and realizes interconnection；Concave-convex tongue and groove 23 is equipped with the circular hole to match with connecting rod 24, and connecting rod 24 is inserted into phase The connection between concave-convex tongue and groove 23 is realized in the hole answered.

Horizontal limit devices 48 include limit truss 49, supporting block 6 and fixed plate 50, and limit truss 49 is equipped with track 26, supporting block 6 is slidably connected by track 26 and limit truss 49, and limit jack is equipped between supporting block 6 and fixed plate 50 It 51 and is connected by limit jack 51, fixed plate 50 is installed on floorings both ends of the surface.

Stress monitoring device 47 is arranged in the lower surface of floorings 3, and level monitoring device 46 is arranged in the upper surface of floorings 3, Level monitoring device 46 is located at servo bracket 18 and 3 bottom span centre position of floorings.

3 bottom of floorings is equipped with bridge bottom distribution beam 22, and 5 top of jack is contacted with 22 bottom of bridge bottom distribution beam.

It is as follows that regularization bent cap connects the specific work progress of high form-tie assembly：

The first step is to need to carry out bent cap 2 to connect high construction when the jacking of floorings 3 to design altitude.It first has in 2 side of bent cap Face is implanted into reinforcing bar, and then installs bent cap 2 and connects high construction formwork, including side form 19, mould 20 and tensioning Side Template 21 is held, such as Fig. 1 It is shown.Template thickness be 12mm thickness steel plate, each template end face be provided with as shown in Figure 2 concave-convex tongue and groove 23, inner hollow, For diameter be 8mm circular hole in addition to bottommost tongue and groove, can it is engaged and by diameter be 8mm connecting rod 24 realize quickly Connection.Side form fixation hole 25 is offered on side form 19, is connect with the reinforcing bar of the implantation of 2 side of bent cap, with the entire template body of fixation System.

Second step is the intensity and stability for further enhancing formwork structure, and side form support 27 is provided on side form 19, It is made of extension sleeve 28 and support backing plate 29.28 diameter of extension sleeve is 28mm, and one end is fixed on support backing plate 29, separately One end is mounted on scaffold.Template after the installation is completed, installs steel reinforcement cage 15, bellows 30 and presstressed reinforcing steel in template 13, and the slip casting in bellows for convenience, it is pre-buried in advance to have got well slip casting duct 31, with reference to Fig. 3.

Third step casting concrete 17 in the space that template surrounds, maintenance connect high construction with complete bent cap 2, then into Row pre-stress construction using the post tensioning construction technology of one-end tension, and retightens floorings 3 on bent cap.Finally to applying The movements and postures of actors 9 are removed.

Support plug-in type scaffold, using vertical bar 32, cross bar 33 and brace 34 are that diameter is 48mm, wall thickness 24mm's Steel pipe, length is depending on Practical Project.35 internal diameter of connecting sleeve is 48mm, wall thickness 36mm, length 0.3m.Production is as schemed first Connecting sleeve 35 shown in 3,41 structure thickness 18mm of swivel becket, high 2cm, the depth opened up in connecting sleeve 35 is 18mm's In circumferential groove.43 straight line height of tooth mouth is spaced 5mm between 1cm and swivel becket 41.Swivel becket 41 is embedded with fixed jaw 44, Gu It is 1.3cm long to determine pawl 44, position realizes that elastic adjusting is fixed at 41 intermediate altitude of swivel becket, through high-strength bolt 45.In addition, turning The Eight Character trough 42. groove depth 8mm, long 16mm are additionally provided on rotating ring 41.

And then cross bar 33 and 34 end of brace are processed, is connect as shown in Fig. 2, 33 end of cross bar is provided with cross bar L-type First 37,34 end of brace is provided with brace connector 38.37 size of L-type connector is corresponding with the L-type slot 36 in connecting sleeve.Tiltedly Bore size on bar connector 38 is corresponding with the bore size of brace connecting rod 39.

Finally vertical bar 32, cross bar 33 and brace 34 are attached using connecting sleeve 35, and are laid with expanded metal lath 40.This Outside, bottom bar 33 is connect by pre-embedded anchoring bolts 10 with ground, fixes entire scaffold.

It is a kind of based on underpining applying for system bridge jacking system based on detachable prestressing force described in the claims Work method, includes the following steps：

The first step：It is to excavate ground, exposes the cushion cap 7 of 1 lower section of pier stud, expansion construction is carried out to it, by design requirement formwork, paving If reinforcing bar, casting concrete, and pre-embedded anchoring bolts 10 are set in advance, it finally obtains and expands cushion cap 8；

Second step：It is to expand by vertical bar 32 above cushion cap, cross bar 33, brace 34 and connecting sleeve 35 build support grafting Formula scaffold 9, and it is laid with expanded metal lath 40；Pre-embedded anchoring bolts 10 on support 9 bottom of plug-in type scaffold and expansion cushion cap 8 It is fixed；

Third step：It is to jack counter-force platform using two pieces of 12 construction bridges of double concave slot；Rubber pad is laid on pier stud 1 first 16, two pieces of double concave slots 12 are then hung to estimating position with loop wheel machine, the worker on coordinative construction frame realizes and tentatively fixes, immediately Steel reinforcement cage 15 and presstressed reinforcing steel 13 are installed in double concave slot 12, and first carry out stretching construction, last casting concrete 17 To adjustable anchor ear pre-loaded support struts platform 11；

4th step：It is that the support 4 being first released between floorings 3 and bent cap 2 is fixed, it is then flat in adjustable anchor ear pre-loaded support struts Jack 5 and tunnel bracket 18 are arranged on platform 11, and then in 3 sole arrangement bridge bottom distribution beam 22 of floorings；

5th step：It is to arrange level monitoring point 46 and stress monitoring point 47 in 3 above and below of floorings, in 3 both ends of the surface of floorings It arranges horizontal limit devices 48, jack-up construction is carried out by jacking control system 52 immediately；

6th step：It is to carry out formwork in 2 surrounding of bent cap, and side form support 27 is installed after floorings are jacked to predetermined altitude, with Steel reinforcement cage 15, bellows 30 and presstressed reinforcing steel 13 are installed in the space that template surrounds afterwards, and reserved slip casting duct 31；Immediately Casting concrete 17 and carry out stretching construction, complete bent cap 2 and connect high construction；Finally installed between bent cap 2 and floorings New support 4 is to fix floorings.

The embodiment of the present invention is given for the purpose of illustration and description, and is not exhaustively or by this to send out It is bright to be limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Choosing Selecting and describe embodiment is and to make those skilled in the art to more preferably illustrate the principle of the present invention and practical application It will be appreciated that the present invention is to design various embodiments suitable for specific applications with various modifications.

Claims (10)

1. one kind underpins system bridge jacking system based on detachable prestressing force, which is characterized in that including being held to bridge is original Platform（7）Carry out the expansion cushion cap that expansion is handled（8）, expand cushion cap（8）On pre-embedded anchoring bolts are installed in advance（10）, expand Big cushion cap（8）On pass through pre-embedded anchoring bolts（10）Support plug-in type scaffold is installed（9）；Support plug-in type scaffold （9）The upper adjustable anchor ear pre-loaded support struts platform of installation（11）As bridge jacking counter-force platform；Bridge includes bent cap（2）Be located at Bent cap（2）On bridge to be jacked floorings（3）, in the bent cap of bridge（2）Upper installation regularization bent cap connects high form-tie assembly；It can Adjust anchor ear pre-loaded support struts platform（11）It is equipped with several jacks（5）And servo bracket（18）, jack（5）With Servo bracket（18）Top and floorings（3）Bottom is forced contact；It further include the jacking control system on scaffold （52）, jack（5）Unification is by jacking control system（52）Control；Floorings（3）Equipped with stress monitoring device（47）And water Quasi- monitor（46）, bent cap（2）It is equipped with for floorings（3）In the horizontal limit devices laterally limited（48）.

2. according to claim 1 underpin system bridge jacking system based on detachable prestressing force, which is characterized in that branch Support plug-in type scaffold（9）By the vertical bar being vertically arranged（32）, horizontally disposed cross bar（33）It is arranged with diagonal cross oblique Bar（34）It is built into concave shape, two vertical bars（32）Between pass through connecting sleeve（35）It is connected as one, cross bar（33）Both ends are set Set cross bar L-type connector（37）, connecting sleeve（35）Upper setting L-type slot（36）, cross bar（33）Both ends pass through cross bar L-type connector（37） With L-type slot（36）Cooperation and connecting sleeve（35）Connection；Brace（34）Brace connector is arranged in end（38）, connecting sleeve（35） Brace connecting rod is set（39）, brace（34）Both ends pass through connector（38）With brace connecting rod（39）Cooperation and connecting sleeve （35）Connection.

3. according to claim 2 underpin system bridge jacking system based on detachable prestressing force, which is characterized in that L Type groove（36）Positioned at connecting sleeve（35）Middle part, brace connecting rod（39）Positioned at connecting sleeve（35）Upper and lower part, tool Body is connecting sleeve（35）Equipped with swivel becket（41）, brace connecting rod（39）Set on swivel becket（41）On.

4. according to claim 2 underpin system bridge jacking system based on detachable prestressing force, which is characterized in that turn Rotating ring（41）The Eight Character trough of upper setting splayed structure（42）, brace connecting rod（39）Across the Eight Character trough（42）The limited connection in tail portion In the Eight Character trough（42）, connecting sleeve（35）With swivel becket（41）Corresponding position is equipped with several tooth mouths（43）, swivel becket（41）Setting There is embedded fixed jaw（44）, swivel becket（41）By embedding fixed jaw（44）With tooth mouth（43）Cooperation limitedly with respect to connector sleeve Pipe（35）Rotation；Swivel becket（41）Equipped with high-strength bolt（45）, embed fixed jaw（44）Pass through high-strength bolt（45）It is fixed on and turns Rotating ring（41）On.

5. according to claim 1 underpin system bridge jacking system based on detachable prestressing force, spy is being, fixed Type bent cap connects high form-tie assembly by side form（19）, end mould（20）, tensioning Side Template（21）It is supported with side form（27）Composition；Hold mould （19）With tensioning Side Template（21）It is reserved with for bellows（30）And presstressed reinforcing steel（13）The hole passed through；Side form（19）, end mould （20）, tensioning Side Template（21）End be equipped with concave-convex tongue and groove（23）, side form（19）, end mould（20）, tensioning Side Template（21） Between be cooperatively connected bar（24）And pass through concave-convex tongue and groove（23）Connection；Side form support（27）Including extension sleeve（28）And supporting pad Plate（29）, support backing plate（29）It is arranged in side form（19）On, extension sleeve（28）One end is supported on support backing plate（29）On, it is another End is fixed on scaffold（9）On.

6. according to claim 5 underpin system bridge jacking system based on detachable prestressing force, spy is being, side Mould（19）, end mould（20）, tensioning Side Template（21）It encloses and forms a construction space after the completion of setting, and steel is installed in this construction space Muscle cage（15）, bellows（30）And presstressed reinforcing steel（13）, side form（19）On be installed with several side form fixation holes（25）, bent cap （2）On be previously implanted several bars and cooperate side form fixation hole（25）Formwork system is supported.

7. according to claim 5 underpin system bridge jacking system based on detachable prestressing force, spy is being, recessed Convex mouth（23）It including sub-portion and mother portion, and is respectively arranged on the different components being attached, including sub-portion is equipped with several It is inserted into column, female portion is equipped with several insertion holes to match with sub-portion, side form（19）, end mould（20）, tensioning Side Template（21）Pass through son Portion is inserted into mother portion and realizes interconnection；Concave-convex tongue and groove（23）It is equipped with and connecting rod（24）The circular hole to match, connecting rod（24）It inserts Enter and realizes concave-convex tongue and groove in corresponding hole（23）Between connection.

8. according to claim 1 underpin system bridge jacking system based on detachable prestressing force, spy is being, horizontal To limiting device（48）Including limiting truss（49）, supporting block（6）And fixed plate（50）, limit truss（49）It is equipped with track （26）, supporting block（6）Pass through track（26）With limit truss（49）It is slidably connected, supporting block（6）And fixed plate（50）Between set There is limit jack（51）And pass through limit jack（51）Connection, fixed plate（50）It is installed on floorings both ends of the surface.

9. according to claim 1 underpin system bridge jacking system based on detachable prestressing force, spy is being, answers Power monitor（47）It is arranged in floorings（3）Lower surface, level monitoring device（46）It is arranged in floorings（3）Upper surface, water Quasi- monitor（46）Positioned at servo bracket（18）Place and floorings（3）Bottom span centre position.

10. a kind of based on the construction for underpining system bridge jacking system described in the claims based on detachable prestressing force Method, which is characterized in that include the following steps：

The first step：It is to excavate ground, exposes pier stud（1）The cushion cap of lower section（7）, expansion construction is carried out to it, by design requirement branch Mould is laid with reinforcing bar, casting concrete, and pre-embedded anchoring bolts is arranged in advance（10）, finally obtain expansion cushion cap（8）；

Second step：It is to pass through vertical bar above expansion cushion cap（32）, cross bar（33）, brace（34）And connecting sleeve（35）Build branch Support plug-in type scaffold（9）, and it is laid with expanded metal lath（40）；Support plug-in type scaffold（9）Bottom and expansion cushion cap（8）On Pre-embedded anchoring bolts（10）It is fixed；

Third step：It is to utilize two pieces of double concave slots（12）Construction bridges jack counter-force platform；First in pier stud（1）Upper laying rubber Pad（16）, then with loop wheel machine by two pieces of double concave slots（12）It is hung to estimating position, the worker on coordinative construction frame realizes preliminary solid It is fixed, and then in double concave slot（12）Interior installation steel reinforcement cage（15）And presstressed reinforcing steel（13）, and stretching construction is first carried out, finally pour Build concrete（17）Obtain adjustable anchor ear pre-loaded support struts platform（11）；

4th step：It is to be first released from floorings（3）And bent cap（2）Between support（4）It is fixed, then in adjustable anchor ear prestressing force Support platform（11）Upper arrangement jack（5）With tunnel bracket（18）, and then in floorings（3）Sole arrangement bridge bottom point With beam（22）；

5th step：It is in floorings（3）Level monitoring point is arranged in above and below（46）With stress monitoring point（47）, in floorings （3）Both ends of the surface arrange horizontal limit devices（48）, pass through jacking control system immediately（52）Carry out jack-up construction；

6th step：It is after floorings are jacked to predetermined altitude, in bent cap（2）Surrounding carries out formwork, and installs side form support （27）, steel reinforcement cage then is installed in the space that template surrounds（15）, bellows（30）And presstressed reinforcing steel（13）, and reserved note Starch duct（31）；And then casting concrete（17）With progress stretching construction, bent cap is completed（2）Connect high construction；Finally covering Beam（2）New support is installed between floorings（4）To fix floorings.