CN114606861B - Distributed supporting and erecting method for large-span segmental bridge - Google Patents
Distributed supporting and erecting method for large-span segmental bridge Download PDFInfo
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- CN114606861B CN114606861B CN202210197696.6A CN202210197696A CN114606861B CN 114606861 B CN114606861 B CN 114606861B CN 202210197696 A CN202210197696 A CN 202210197696A CN 114606861 B CN114606861 B CN 114606861B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention discloses a distributed supporting and erecting method for a large-span segmental bridge, which comprises the following steps: the method comprises the following steps: the via hole is in place; step two: when symmetrically assembling, the tail floating support leg and the front floating support leg are respectively supported on the section beam which is just erected and the constant counter-force support is started to complete assembling; step three and step four: exchanging the positions of the middle leg and the middle leg in the tail part; step five: the main beam moves forwards until the front support leg is positioned at the Pn +3 pier; step six and step seven: the middle support leg is respectively supported at the Pn +2 pier and the Pn +3 pier; step eight: moving the main beam; step nine: and (5) repeating the steps when the through hole is in place. The bridge has the advantages that the bridge meets the erection of a large-span bridge, the length of the erection equipment is short, the integral length is less than two spans, the self weight of the erection equipment is light, the appearance size is small, and the pier bears smaller load.
Description
Technical Field
The invention relates to the field of erection equipment construction. More particularly, the invention relates to a distributed support erection method for a large-span segmental bridge.
Background
With the development of bridge construction technology, the number of large-span segmental beam bridges is increased, and the construction span of partial segmental beam bridges is planned to 120m. No matter the traditional erection equipment is a tail feeding beam or a bridge feeding beam, the span is larger than two spans, the span is large, the weight of a main beam in unit length is large, the overall dimension of the erection equipment is large, and the counterforce born by a pier is large. When the device is installed on site, a large-load crane or assembly of parts is needed. The method for supporting and erecting the large-span segmental bridge in the distributed mode is high in equipment cost and installation cost, high in installation risk and low in efficiency, and the method for supporting and erecting the large-span segmental bridge in the distributed mode is invented on the background.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems: the long span of the length relative to the span of the girder of the traditional erection equipment is larger than 2 times, and when the traditional erection equipment is used for erecting a large-span bridge, the equipment has large overall dimension, heavy weight and high cost. During installation, an extra-large crane is adopted or the spare parts are assembled, so that the installation cost is high, the risk is high, and the work efficiency is low during the assembly of the spare parts; when the traditional erection equipment is used for passing through holes, a large cantilever is arranged at the front main beam, the stress and downwarping of the main beam are large, and the strength and rigidity of the main beam design are correspondingly increased; the ability that traditional middle part landing leg and the tail landing leg of erectting equipment adapt to the bridge and change is poor, and when the bridge change was little, erect and equip just need to make great change, with high costs.
Disclosure of Invention
The invention aims to provide a distributed support erection method for a large-span segmental bridge, which meets the erection requirement of a large-span bridge, has short erection equipment, light self weight and small overall size, and ensures that a pier bears small load, and the overall length of the erection equipment is less than two spans.
To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, there is provided a distributed support erection method for a large-span segmental bridge, which includes erection equipment including a tail leg, a front leg, a tail middle leg, a front middle leg, a tail floating leg, a front floating leg, a tail crane, a front crane, and a girder, the distributed support erection method for a large-span segmental bridge including:
the method comprises the following steps: in an initial state, the tail middle support leg and the front middle support leg are respectively supported on a Pn +1 pier and a Pn +2 pier, wherein a section beam on the Pn +1 pier is erected, the main beam is supported by the tail middle support leg and the front middle support leg in a sliding manner, the front support leg and the tail support leg are retracted, the main beam moves forwards, and a through hole is formed in place;
step two: symmetrically assembling section beams on two sides of the Pn +2 pier by using a tail hoisting overhead crane and a front hoisting overhead crane, respectively supporting a tail floating leg and a front floating leg on two sides of the section beams on two sides of the Pn +2 pier which is just erected during symmetrical assembling, starting a constant counter-force supporting main beam, and assembling the T-structure section beams section by section;
step three: unloading the supporting force of the tail floating supporting leg and the front floating supporting leg, supporting the main beam through the tail supporting leg, hoisting the tail middle supporting leg to the front of the front middle supporting leg by using a front hoisting crown block, and installing, wherein the tail middle supporting leg is changed into the front middle supporting leg;
step four: the front middle support leg at the Pn +2 pier automatically moves backwards to a position close to the span 1/4 of the Pn +1 pier, and the front middle support leg is changed into a tail middle support leg;
step five: the tail support leg is retracted, the main beam is supported through the tail middle support leg and the front middle support leg, the front hoisting crown block runs to the rear of the main beam, and the main beam moves forwards until the front support leg is positioned at the Pn +3 pier;
step six: the main beam is supported by the front support leg and the rear support leg, and the middle support leg at the tail part moves to the position of Pn +2 pier for supporting;
step seven: the front middle support leg is lifted by a front crane and moved forwards to a Pn +3 pier for supporting;
step eight: retracting the tail support leg and the front support leg, and moving the main beam forwards;
step nine: and (4) passing the hole in place, returning to the step one, repeating the step one to the step nine, and erecting the section beam of the next pier position again.
Preferably, the length of the main beam is less than 2 bridge spans.
Preferably, the length of the main beam is 1.7 times the span of the bridge.
Preferably, the tail, tail and front center legs of the erection device are all of modular design.
Preferably, the front supporting leg is a telescopic oil cylinder supporting leg and is fixed on the main beam.
Preferably, the tail landing leg slides to hang and locates on the girder, the tail landing leg includes:
the bottom of the supporting cross beam is provided with a plurality of gradient adjusting assemblies, each gradient adjusting assembly comprises a supporting nut and a supporting screw rod, each supporting nut is fixed on the corresponding supporting cross beam, each supporting screw rod is in threaded fit with each supporting nut, and the supporting cross beam is supported on the corresponding segment beam through the corresponding supporting screw rods;
two lower supporting components are symmetrically arranged on the supporting cross beam, and the lower supporting components are connected to the supporting cross beam in a sliding mode through sliding supports;
the two upper supporting assemblies are arranged and are connected with the lower supporting assembly through jacking oil cylinders in a one-to-one correspondence manner;
and the hanging wheels are symmetrically arranged on each upper supporting component, and the hanging wheels are arranged on the main beam in a sliding and hanging manner.
Preferably, the tail middle leg and the front middle leg are detachably disposed on the main beam, and each of the tail middle leg and the front middle leg includes:
the side surfaces of the bearing beams are provided with connecting interfaces, adjacent bearing beams are assembled into an integrated structure through the connecting interfaces, and the bottom of each bearing beam is provided with a plurality of vertical supports which are of telescopic structures;
the pair of rotating bases are symmetrically arranged on the bearing beam, are connected to the bearing beam in a sliding mode through sliding seats, and are connected with each other through a transverse adjusting oil cylinder and a connecting rod;
the pair of rotating supports are arranged and are rotationally connected to the pair of rotating bases in a one-to-one correspondence manner through rotating shafts;
the upper balance beams are symmetrically arranged on the rotating support, and are provided with longitudinal oil cylinders which are detachably connected to the main beam;
the anchoring supports are symmetrically arranged in pairs at two sides of the bearing beam, and guardrail platforms are fixedly arranged on the anchoring supports;
and the two ends of the twisted steel bars are detachably connected to the section beam and the anchoring support respectively.
Preferably, the vertical support comprises a transverse adjusting support, a height connecting support and a supporting oil cylinder, the transverse adjusting support is connected to the bearing beam in a sliding mode, the height connecting support is detachably connected to the position below the transverse adjusting support, and the supporting oil cylinder is connected to the height connecting support.
Preferably, the rear floating leg and the front floating leg are for supporting the main girder, and the floating leg includes:
the supporting frame is of a U-shaped structure, a plurality of adjusting nuts are arranged at the bottom of the supporting frame, a plurality of adjusting screw rods are correspondingly matched in the adjusting nuts in a one-to-one mode, and the supporting frame is supported on the section beam through the plurality of adjusting screw rods;
and the top parts of the two sides of the supporting frame are respectively provided with one constant counter-force oil cylinder, and the constant counter-force oil cylinders are provided with supporting seats which are supported on the bottom surface of the main beam.
The invention at least comprises the following beneficial effects:
1. compared with traditional erection equipment, the length of the main beam is less than twice the span of the main span, the whole machine is light in weight, the overall dimension of the main beam is small, the installation is convenient, and the acting force on a pier body is small;
2. when the equipment is erected on the via hole, the floating support legs are added, and a plurality of sets of floating support legs can be added to form distributed support, so that the stress of the main beam is reduced, the load is uniformly distributed on the assembled segmental beams, and the distributed support is constant support reaction force, so that the influence of overlarge support reaction force on the segmental beams is avoided, and the effects of small structure and light weight of the main beam are achieved;
3. the hydraulic tail supporting leg which can adjust a transverse fulcrum and can be hung and run with an adjustable lower fulcrum is adopted, so that the hydraulic tail supporting leg is suitable for the change of the tail fulcrum on one hand, and is suitable for small transverse and longitudinal slopes through simple adjustment on the other hand, the tail supporting leg can run along a main beam, and the difficulty of carrying the traditional tail supporting leg by a crown block is changed;
4. adopt modular well landing leg, well landing leg upper portion centre-to-centre spacing is adjustable, and the support interval of lower part is adjustable, and the length of carrier bar has the interface to be adjustable, can adapt to multiple roof beam type, compares with landing leg in the tradition, need not reform transform, as long as the adjustment interval can use.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic view of a first step of the erecting method of the present invention;
FIG. 2 is a schematic view of a second step of the erecting method of the present invention;
FIG. 3 is a third schematic view of the erecting method according to the present invention;
FIG. 4 is a fourth schematic view of the erecting method according to the present invention;
FIG. 5 is a fifth schematic view of the method of the present invention;
FIG. 6 is a sixth schematic view of the erecting method according to the present invention;
FIG. 7 is a seventh schematic view of the erecting method according to the present invention;
FIG. 8 is an eighth schematic view of the method of the present invention;
FIG. 9 is a ninth schematic view of the construction method of the present invention;
FIG. 10 is a schematic view of the overall structure of the erection equipment of the present invention;
FIG. 11 is a side view of the floating leg of the present invention;
FIG. 12 is a side view of the tail leg of the present invention;
FIG. 13 is a front view of the middle leg of the present invention;
fig. 14 is a side view of the middle leg of the present invention.
Description of the reference numerals:
1. tail support leg, 101, hanging wheel, 102, upper support component, 103, jacking oil cylinder, 104, lower support component, 105, sliding support, 106, support beam, 107, gradient adjustment component, 2, tail middle support leg, 201, longitudinal oil cylinder, 202, upper balance beam, 203, rotating support, 204, rotating shaft, 205, rotating base, 206, sliding seat, 207, transverse adjustment oil cylinder, 208, connecting rod, 209, carrier beam, 210, connecting interface, 211, anchoring support, 212, guardrail platform, 213, transverse adjustment support, 214, connecting support, 215, support oil cylinder, 216, threaded steel bar, 3, tail hoisting crown block, 4, tail floating support leg, 401, support seat, 402, constant reaction oil cylinder, 403, support frame, 404, adjustment nut, 405, adjustment screw, 5, front middle support leg, 6, front hoisting crown block, 7, front support leg, 8, main beam, 9, segment beam, 10, front floating support leg.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As used herein, the terms "front" and "tail" refer to the right and left sides of the drawings. In fig. 1 to 9, the piers from the left side to the right side are Pn +0, pn +1, pn +2, pn +3, pn +4 in this order.
As shown in fig. 1 to 9, the invention provides a distributed supporting and erecting method for a long-span segmental bridge, which specifically comprises the following steps:
the method comprises the following steps: as shown in fig. 1, in an initial state, the tail middle leg 2 and the front middle leg 5 are respectively supported on the pier Pn +1 and the pier Pn +2, wherein the segment beam 9 on the pier Pn +1 is erected, the main beam 8 is slidably supported by the tail middle leg 2 and the front middle leg 5, the front leg 7 and the tail leg 1 are retracted, the main beam 8 moves forwards, and the via hole is in place;
step two: as shown in fig. 2, symmetrically assembling section beams 9 on two sides of the pier Pn +2 by using a tail hoisting crown block 3 and a front hoisting crown block 6, respectively supporting a tail floating leg 4 and a front floating leg 10 on two sides of the section beam 9 on two sides of the pier Pn +2 which is just erected during symmetrical assembling, starting a constant counter-force supporting main beam 8, and assembling the section beams 9 of the T-structure section one by one;
step three: as shown in fig. 3, the supporting force of the tail floating leg 4 and the front floating leg 10 is unloaded, the main beam 8 is supported by the tail leg 1, the tail middle leg 2 is lifted to the front of the front middle leg 5 by using the front crane and is installed, and the tail middle leg 2 is changed into the front middle leg 5;
step four: as shown in FIG. 4, the front center leg 5 at Pn +2 pier moves back on its own to a position of 1/4 of the span adjacent to Pn +1 pier, where the front center leg 5 becomes the tail center leg 2; after the third step and the fourth step, the positions of the front middle leg 5 and the tail middle leg 2 are exchanged, so that in the figure of the application, as long as the front middle leg 5 is positioned at the front part, the tail middle leg 2 is positioned at the tail part;
step five: as shown in fig. 5, the tail support leg 1 is retracted, the main beam 8 is supported by the tail middle support leg 2 and the front middle support leg 5, the front hoisting crown block 6 runs behind the main beam 8, and the main beam 8 moves forwards until the front support leg 7 is located at the pier Pn + 3;
step six: as shown in fig. 6, the girder 8 is supported by the front leg 7 and the rear leg, and the tail middle leg 2 moves to the pier Pn +2 for support;
step seven: as shown in fig. 7, the front middle support leg 5 is lifted by a front crane and moved forward to Pn +3 pier for supporting;
step eight: as shown in fig. 8, the tail legs 1 and the front legs 7 are retracted, moving the main beam 8 forward;
step nine: as shown in fig. 9, the via hole is in place, the first step is repeated, the first to ninth steps are repeated, and the erection of the segmental beam 9 of the next pier position is started again.
The distributed supporting and erecting method of the large-span segmental bridge is achieved by erecting equipment, as shown in fig. 10, the erecting equipment comprises a tail supporting leg 1, a front supporting leg 7, a tail middle supporting leg 2, a front middle supporting leg 5, a tail floating supporting leg 4, a front floating supporting leg 10, a tail hoisting crown block 3, a front hoisting crown block 6 and a main beam 8, and the tail hoisting crown block 3 and the front hoisting crown block 6 are arranged on the main beam 8 and used for hoisting, moving and other functions in the construction process; the tail support leg 1, the front support leg 7, the tail middle support leg 2, the front middle support leg 5, the tail floating support leg 4 and the front floating support leg 10 are all used for supporting or moving the main beam 8; to the large-span bridge, this application adopts 8 structural style that length of girder is less than 2 times span, and 8 structural dimension of girder are little, light in weight. The whole length of girder 8 is about 1.7 times of the bridge span, and in the whole structure composition, additionally add two sets of landing legs that float, with the help of the segmental beam 9 that has erect, further reduce the girder 8 atress, it is big to have solved the erection equipment overall dimension of large-span segmental beam 9 bridge, and weight is big, and the installation is difficult, to the too big problem of bridge counterforce. Especially in some river-crossing and river-crossing sections, large-scale floating cranes are difficult to enter, and erection equipment is difficult to hoist in whole or assemble in parts; the modular design of the tail leg 1 and the middle leg increases the support adjustment adaptability when the beam section is changed.
In one technical scheme, the front supporting leg 7 is a telescopic oil cylinder supporting leg and is fixed on the main beam 8, and the front supporting leg can adapt to the downwarp of the main beam 8 during spanning.
In one technical solution, as shown in fig. 12, the tail leg 1 is slidably hung on the main beam 8, and the tail leg 1 includes:
a supporting beam 106, the bottom of which is provided with a plurality of gradient adjusting assemblies 107, wherein each gradient adjusting assembly 107 comprises a supporting nut and a supporting screw, the supporting nut is fixed on the supporting beam 106, the supporting screw is in threaded fit with the supporting nut, and the supporting beam 106 is supported on the segment beam 9 through the plurality of supporting screws;
two lower support assemblies 104 are symmetrically arranged on the support cross beam 106, and the lower support assemblies 104 are slidably connected to the support cross beam 106 through sliding supports 105;
two upper supporting assemblies 102 are arranged and are connected with the lower supporting assembly 104 through a jacking oil cylinder 103 in a one-to-one correspondence manner;
and a pair of hanging wheels 101 are symmetrically arranged on each upper supporting component 102, and the pair of hanging wheels 101 are hung on the main beam 8 in a sliding manner.
In the technical scheme, the tail supporting leg 1 is a hydraulic telescopic supporting leg, the upper supporting component 102 and the lower supporting component 104 are adjusted by jacking the jacking oil cylinder 103, and the random adjustment of the longitudinal position is solved; a change gear 101 is added on the tail support leg 1 and can be hung on the main beam 8, the change gear 101 is connected with a motor arranged on the tail support leg 1 and driven by the motor to move forwards along the main beam 8, and the tail support leg 1 can also be supported as a fulcrum for taking the beam at the tail part; the lower part of the tail support leg 1 is provided with a sliding support 105, the lower support assembly 104 can move along the support cross beam 106 and can adapt to different fulcrum changes, meanwhile, the lower part of the support cross beam 106 is provided with an assembly capable of adjusting the gradient, 4 assemblies are arranged, no extra support cushion is needed, and the gradient adjustment requirement of the main beam 8 can be met only by adjusting the support screw.
In one embodiment, as shown in fig. 13 and 14, the rear center leg 2 and the front center leg 5 are detachably disposed on the main beam 8, and the rear center leg 2 and the front center leg 5 each include:
the lateral surfaces of the carrier beams 209 are provided with connecting interfaces 210, adjacent carrier beams 209 are assembled into an integrated structure through the connecting interfaces 210 and are lengthened according to fulcrum changes and transverse movement ranges, and the bottom of each carrier beam 209 is provided with a plurality of vertical supports which are of telescopic structures;
the pair of rotating bases 205 are symmetrically arranged on the bearing beam 209, the rotating bases 205 are connected to the bearing beam 209 in a sliding mode through sliding seats 206, the pair of rotating bases 205 are connected through transverse adjusting oil cylinders 207 and connecting rods 208, the distance between the rotating bases 205 is long, and the distance adjustment is realized through the common connection of the transverse adjusting oil cylinders 207 and the connecting rods 208, so that the adjustment according to the size structure of the main beam 8 is realized, the change of beam sections is better adapted, and the adaptability of middle support legs is improved;
a pair of rotating supports 203 is also arranged, the pair of rotating supports 203 are respectively connected to the pair of rotating bases 205 in a one-to-one corresponding manner through rotating shafts 204, and the middle supporting legs can rotate within a certain range to adapt to the horizontal adjustment of the main beam 8;
a pair of upper balance beams 202 symmetrically arranged on the rotating support 203, wherein a longitudinal oil cylinder 201 is arranged on the upper balance beams 202, is detachably connected to the main beam 8, and drives the main beam 8 to move along the middle support leg through the longitudinal oil cylinder 201;
the anchor supports 211 are symmetrically arranged in pairs at two sides of the bearing beam 209, the guardrail platforms 212 are fixedly arranged on the anchor supports 211, and the guardrail platforms 212 are used for construction operation of mounting and dismounting the twisted steel bars 216 on one hand and are convenient for construction personnel to climb onto the main beam 8 on the other hand;
the pair of threaded steel bars 216 is arranged, two ends of each threaded steel bar 216 are detachably connected to the corresponding segmental beam 9 and the corresponding anchoring support 211 respectively, and the corresponding anchoring support 211 and the corresponding threaded steel bars 216 fixedly connect the middle supporting leg and the corresponding segmental beam 9 into a whole, so that the main beam 8 and the middle supporting leg can move relatively conveniently.
The vertical support comprises a transverse adjusting support 213, a height-increasing support 214 and a supporting oil cylinder 215, the transverse adjusting support 213 is connected to the bearing beam 209 in a sliding mode, the height-increasing support 214 is detachably connected to the lower portion of the transverse adjusting support 213, the supporting oil cylinder 215 is connected to the height-increasing support 214, the middle support leg is formed by a modular structure, and the transverse adjusting support 213 at the lower portion can slide along the bearing beam 209 to adapt to different fulcrum changes.
In one solution, as shown in fig. 11, the rear floating leg 4 and the front floating leg 10 are used to support the main beam 8, and the floating legs include:
the supporting frame 403 is of a U-shaped structure, a plurality of adjusting nuts 404 are arranged at the bottom of the supporting frame 403, a plurality of adjusting screws 405 are correspondingly matched in the supporting frame 403, the number of the adjusting nuts and the number of the adjusting screws are respectively 4, the adjusting nuts and the adjusting screws are distributed in a rectangular shape, the supporting frame 403 is supported on the segmental beam 9 through the plurality of adjusting screws 405, and the gradient change of the main beam 8 can be adapted through the adjustment of the adjusting screws;
constant-reaction-force oil cylinder 402, it is in each sets up one at the both sides top of braced frame 403, be provided with supporting seat 401 on the constant-reaction-force oil cylinder 402, it supports in 8 bottom surfaces of girder, through starting constant-reaction-force oil cylinder 402, constant-reaction-force oil cylinder 402 can support in 8 lower parts of girder according to the constant force that sets up, provides extra fulcrum for girder 8, reduces 8 bending moments of girder, and when not needing to support, it is downward to start constant-reaction-force oil cylinder 402, and supporting seat 401 has the interval with girder 8, does not take place mutual interference, and the landing leg that floats is shelved on section roof beam 9.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (9)
1. The distributed supporting and erecting method of the large-span segmental bridge is characterized by being erected through erecting equipment, wherein the erecting equipment comprises tail support legs, front support legs, tail middle support legs, front middle support legs, tail floating support legs, front floating support legs, a tail hoisting crown block, a front hoisting crown block and a main beam, and the distributed supporting and erecting method of the large-span segmental bridge specifically comprises the following steps:
the method comprises the following steps: in an initial state, the tail middle support leg and the front middle support leg are respectively supported on a Pn +1 pier and a Pn +2 pier, wherein a section beam on the Pn +1 pier is erected, a main beam is supported in a sliding mode through the tail middle support leg and the front middle support leg, the front support leg and the tail support leg are retracted, the main beam moves forwards, and a through hole is formed in place;
step two: symmetrically assembling section beams on two sides of the Pn +2 pier by using a tail hoisting overhead crane and a front hoisting overhead crane, respectively supporting a tail floating leg and a front floating leg on two sides of the section beams on two sides of the Pn +2 pier which is just erected during symmetrical assembling, starting a constant counter-force supporting main beam, and assembling the T-structure section beams section by section;
step three: unloading the supporting force of the tail floating supporting leg and the front floating supporting leg, supporting the main beam through the tail supporting leg, hoisting the tail middle supporting leg to the front of the front middle supporting leg by using a front hoisting crown block, and installing, wherein the tail middle supporting leg is changed into the front middle supporting leg;
step four: the front middle support leg at the Pn +2 pier automatically moves backwards to a position close to the 1/4 span of the Pn +1 pier, and the front middle support leg is changed into a tail middle support leg;
step five: the tail support leg is retracted, the main beam is supported through the tail middle support leg and the front middle support leg, the front hoisting crown block runs to the rear of the main beam, and the main beam moves forwards until the front support leg is positioned at the Pn +3 pier;
step six: the main beam is supported by the front support leg and the rear support leg, and the middle support leg at the tail part moves to the position of Pn +2 pier for supporting;
step seven: the front middle support leg is lifted by a front crane and moved forwards to a Pn +3 pier for supporting;
step eight: retracting the tail support leg and the front support leg, and moving the main beam forwards;
step nine: and (4) passing the hole in place, returning to the step one, repeating the step one to the step nine, and erecting the section beam of the next pier position again.
2. The distributed supporting and erecting method for the long-span segmental bridge girder of claim 1, wherein the length of the girder is less than 2 times the span of the girder.
3. The distributed supporting and erecting method for the long-span segmental bridge girder of claim 2, wherein the length of the main girder is 1.7 times the span of the bridge girder.
4. The distributed support erection method of a large-span segmental bridge of claim 1, wherein the tail leg, the tail center leg and the front center leg of the erection device are all of modular design.
5. The distributed support erection method of a long-span segmental bridge of claim 1, wherein said front legs are telescopic cylinder legs and are fixed to said main girders.
6. The distributed support erection method of a large-span segmental bridge of claim 1, wherein said tail leg is slidingly suspended from said main beam, said tail leg comprising:
the bottom of the supporting cross beam is provided with a plurality of gradient adjusting assemblies, each gradient adjusting assembly comprises a supporting nut and a supporting screw rod, each supporting nut is fixed on the corresponding supporting cross beam, each supporting screw rod is in threaded fit with each supporting nut, and the supporting cross beam is supported on the corresponding segment beam through the corresponding supporting screw rods;
two lower supporting components are symmetrically arranged on the supporting cross beam, and the lower supporting components are connected to the supporting cross beam in a sliding mode through sliding supports;
the two upper supporting assemblies are arranged and are connected with the lower supporting assembly through jacking oil cylinders in a one-to-one correspondence manner;
and the hanging wheels are symmetrically arranged on each upper supporting component, and the hanging wheels are arranged on the main beam in a sliding and hanging manner.
7. The distributed support erection method for a large-span segmental bridge of claim 1, wherein the trailing middle leg and the leading middle leg, each of which comprises:
the side surfaces of the bearing beams are provided with connecting interfaces, adjacent bearing beams are assembled into an integrated structure through the connecting interfaces, and the bottom of each bearing beam is provided with a plurality of vertical supports which are of telescopic structures;
the rotating bases are symmetrically arranged on the bearing beam in pairs, the rotating bases are connected to the bearing beam in a sliding mode through sliding bases, and the rotating bases are connected with each other through a transverse adjusting oil cylinder and a connecting rod;
the pair of rotating supports are arranged and are rotationally connected to the pair of rotating bases in a one-to-one correspondence manner through rotating shafts;
the upper balance beams are symmetrically arranged on the rotating support, and are provided with longitudinal oil cylinders which are detachably connected to the main beam;
the anchoring supports are symmetrically arranged in pairs at two sides of the bearing beam, and guardrail platforms are fixedly arranged on the anchoring supports;
and the two ends of the twisted steel bars are detachably connected to the section beam and the anchoring support respectively.
8. The distributed supporting and erecting method for the long-span segmental bridge girder of claim 7, wherein the vertical supports comprise a lateral adjusting support, an elevating support and supporting cylinders, the lateral adjusting support is slidably connected to the carrier beam, the elevating support is detachably connected to the lower portion of the lateral adjusting support, and the supporting cylinders are connected to the elevating support.
9. The distributed support erection method of a long-span segmental bridge of claim 1, wherein the tail and front floating legs are used to support the girder, the floating legs comprising:
the supporting frame is of a U-shaped structure, a plurality of adjusting nuts are arranged at the bottom of the supporting frame, a plurality of adjusting screws are correspondingly matched in the adjusting nuts one by one, and the supporting frame is supported on the section beam through the plurality of adjusting screws;
and the constant-reaction oil cylinders are respectively arranged at the tops of two sides of the supporting frame, and are provided with supporting seats which are supported on the bottom surface of the main beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210197696.6A CN114606861B (en) | 2022-03-01 | 2022-03-01 | Distributed supporting and erecting method for large-span segmental bridge |
Applications Claiming Priority (1)
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| CN103422441A (en) * | 2013-08-13 | 2013-12-04 | 中铁六局集团有限公司 | Perforating method for erecting long-span highway box girders by using DJ180 bridge erecting machine |
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| CN110130229A (en) * | 2019-06-24 | 2019-08-16 | 中交一公局第六工程有限公司 | It a kind of several juxtaposed double cantilever erections machines and its sets a roof beam in place and passing method |
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