CN209024979U - A kind of prestressed concrete box girder precast segment free cantilever erection system - Google Patents
A kind of prestressed concrete box girder precast segment free cantilever erection system Download PDFInfo
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- CN209024979U CN209024979U CN201821603304.7U CN201821603304U CN209024979U CN 209024979 U CN209024979 U CN 209024979U CN 201821603304 U CN201821603304 U CN 201821603304U CN 209024979 U CN209024979 U CN 209024979U
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- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 29
- 230000000087 stabilizing effect Effects 0.000 claims description 15
- 238000010276 construction Methods 0.000 abstract description 37
- 238000000034 method Methods 0.000 description 15
- 239000004567 concrete Substances 0.000 description 10
- 238000005266 casting Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000007630 basic procedure Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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Abstract
The utility model discloses a kind of prestressed concrete box girder precast segment free cantilever erection systems, it further include lifting drag-line (3), erection crane (4) including bridge pier (8) and setting in the pier side hanging beam platform (1) of the bridge pier (8) two sides；Wherein, bridge section to be assembled (2) are placed on hanging beam platform (1) by the pier, the erection crane (4) is set to bridge floor two sides, the erection crane (4) connect its promotion of realization with the bridge section (2) to be assembled by the lifting drag-line (3), and the erection crane (4) is used for movement of the bridge section (2) to be assembled to two sides using the combination of cable traction system or the hydraulic walking system of walking or both.The system operability is good, avoids high-altitude cantilever pouring operation, and simple to operate, greatly reduces construction risk.
Description
Technical Field
The utility model belongs to the technical field of bridge engineering, more specifically relates to a precast cantilever system of assembling of prestressed concrete box girder segment section.
Background
At present, the construction of a cantilever construction method is an effective construction means for constructing a large and medium span bridge. The cantilever construction method is a construction method that the beam part construction starts from a middle pier of a bridge, concrete is gradually lengthened and poured in a symmetrical mode, and a beam section is hung out until closure. The basic procedure of the cantilever casting construction method comprises two steps: firstly, a pouring block forms a T structure (the shape of a structural vertical face formed by temporarily solidifying pier beams); and secondly, dividing the bridge body into a plurality of sections along the axis of the bridge, and symmetrically pouring concrete on two sides of the poured blocks in situ by using hanging baskets.
For the bridge position with limited transportation conditions under the bridge, when a large-span prestressed concrete beam bridge is adopted, the conventional construction method can only adopt a cantilever pouring method and a large-section cantilever pouring method due to the restriction of the terrain. There are several disadvantages when the above conventional construction method is adopted: the construction period is long. The cantilever pouring construction process is complex, the construction period is limited by the age of concrete, and the construction progress is influenced by high-altitude operation; the construction operation is difficult. The high-altitude cantilever pouring construction is difficult in construction operation, high in construction risk and poor in concrete curing condition; the construction precision and quality are poor. In high-altitude cantilever casting construction, the construction line shape is difficult to control, and the construction quality is difficult to effectively ensure.
Therefore, a prestressed concrete box girder segment prefabricated cantilever assembling system which is short in construction period, good in construction operability, construction precision and quality and good in terrain adaptability is needed.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects or improvement requirements of the prior art, the utility model provides a precast cantilever assembling system for prestressed concrete box girder segments, wherein bridge deck cranes are arranged on two sides of a bridge deck and are connected with bridge segments to be assembled through hoisting cables, and the hoisting of the bridge segments to be assembled is realized through the stretching of the hoisting cables; the bridge floor loop wheel machine can be in longitudinal movement on the bridge floor, drive lift by crane the cable and treat to assemble the bridge section and remove to both sides the utility model discloses a cantilever casting system, maneuverability is good, has avoided high altitude cantilever casting operation to easy operation is convenient, very big reduction the construction risk.
In order to achieve the aim, the precast cantilever assembling system for the prestressed concrete box girder segment comprises a bridge pier, pier-side hanging beam platforms arranged on two sides of the bridge pier, a hoisting cable and a bridge deck crane; wherein,
the bridge deck crane is arranged on two sides of the bridge deck, and is connected with the bridge sections to be assembled through the hoisting cables to realize the hoisting; the bridge deck crane comprises pulleys, a yard winding machine lifting device and a bridge girder erection machine truss, wherein the pulleys and the yard winding machine lifting device are symmetrically arranged on two sides of the bridge girder erection machine truss respectively, and the pulleys and the yard winding machine lifting device are connected with the hoisting cables respectively; the bridge deck crane adopts a cable traction system or a walking hydraulic walking system or the combination of the cable traction system and the walking hydraulic walking system for moving the bridge section to be assembled to two sides.
Furthermore, the lower end of the hoisting inhaul cable is connected with a carrying pole beam, and a hoisting point is arranged on the bridge section to be assembled.
Furthermore, the truss of the bridge girder erection machine, the spliced beam sections, the carrying pole beam and the bridge section to be spliced are kept parallel.
And furthermore, a stabilizing cable is further arranged, one end of the stabilizing cable is fixedly connected with the bridge section to be assembled, and the other end of the stabilizing cable is respectively connected with the beam part above the pier and the last assembled bridge section.
Further, still include segment travelling bogie, beam segment lift station and set up the cantilever front end loop wheel machine at cantilever both ends.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
(1) the utility model discloses a precast cantilever assembly system of prestressed concrete box girder segment, the bridge floor both sides set up the bridge floor loop wheel machine, it is connected with the bridge section of waiting to assemble through the cable that lifts by crane, realize through the drawing of the cable that lifts by crane the promotion of the bridge section of waiting to assemble; the bridge floor loop wheel machine can be in longitudinal movement on the bridge floor, drive lift by crane the cable and treat to assemble the bridge section and remove to both sides the utility model discloses a cantilever casting system, maneuverability is good, has avoided high altitude cantilever casting operation to easy operation is convenient, very big reduction the construction risk.
(2) The utility model discloses a system is assembled to precast cantilever of prestressed concrete box girder segment section, this system still are provided with the stabilizing cable and are used for reducing the wind-induced vibration waiting to assemble the transportation walking in-process of bridge section.
(3) The utility model discloses a precast cantilever system of assembling of prestressed concrete box girder segment section, adopt fast slow combination to walk capable system, the transportation is waited to assemble the walking of the bridge floor loop wheel machine on the beam section and can is adopted cable traction system, perhaps walking hydraulic pressure walks capable system, the preferred fast slow combination that adopts the combination between them walks capable system, it walks capable system to adopt walking hydraulic pressure to walk the shape in-process at the load of beam section hoisting station drive waiting to assemble the bridge section to the cantilever front end, the stationarity has been guaranteed, better suitable circuit longitudinal slope influences, and when beam section hoisting station return stroke unloaded hangs one section and waits to assemble the bridge section, and adopt cable traction system or wheel rail formula to walk capable system. The running speed is accelerated, and the construction period has outstanding advantages.
(4) The utility model discloses a precast cantilever system of assembling of prestressed concrete box girder segment section sets up the segment travelling bogie on the bridge floor, and the bridge both ends of assembling simultaneously set up cantilever front end loop wheel machine, and the segment travelling bogie is used for hanging by the bridge floor loop wheel machine and gets the cantilever front end loop wheel machine that the bridge floor was assembled to treating of bridge floor transportation to both ends, mutually supports between bridge floor loop wheel machine and the segment travelling bogie, has improved work efficiency.
Drawings
Fig. 1 is a schematic view of an initial state of a precast cantilever assembling system for a prestressed concrete box girder segment according to an embodiment of the present invention;
FIG. 2 is a schematic view of a vertical lifting beam section of a precast cantilever assembling system for prestressed concrete box beam sections according to an embodiment of the present invention;
fig. 3 is a schematic view of a transverse conveying beam section of a precast cantilever assembling system for prestressed concrete box beam sections according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of beam segment splicing of a precast cantilever splicing system for prestressed concrete box beam segments according to an embodiment of the present invention;
FIG. 5 is a schematic view of a transportation cart for arranging segments on a second bridge floor according to the embodiment of the present invention;
fig. 6 is the embodiment of the utility model provides a cantilever system of assembling that precast cantilever of prestressed concrete box girder segment section assembled the system and related to is the schematic cross section.
In all the figures, the same reference numerals denote the same features, in particular: 1-pier-side hanging beam platform, 2-bridge section to be assembled, 3-hoisting guy cable, 4-bridge deck crane, 5-stabilizing cable, 6-segment transport trolley, 7-beam section lifting station, 8-pier, 9-pulley and yard machine lifting equipment, 10-assembled beam section, 11-hoisting point, 12-bridge girder erection machine truss, 13-bridge girder erection machine running mechanism, 14-carrying pole beam and 15-cantilever front end crane.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Fig. 1 is a schematic view of an initial state of a precast cantilever assembling system for a prestressed concrete box girder segment according to an embodiment of the present invention; FIG. 2 is a schematic view of a vertical lifting beam section of the cantilever assembling system; FIG. 3 is a schematic view of a transverse transport beam segment of the cantilever assembly system; fig. 4 is a schematic diagram of beam segment splicing of the cantilever splicing system. As shown in fig. 1-4, the bridge is provided with piers 8 under the bridge, the two sides of the piers 8 are provided with pier-side hanging beam platforms 1 for placing the to-be-assembled bridge sections 2 which are manufactured in a centralized manner at the piers, the two sides of the bridge deck are symmetrically provided with bridge deck cranes 4, the bridge deck cranes 4 are connected with the to-be-assembled bridge sections 2 through hoisting cables 3, the to-be-assembled bridge sections 2 are lifted under the stretching action of the hoisting cables 3, and when the bridge deck cranes 4 are at pier-side hoisting initial positions, the hoisting cables 3 connected with the bridge deck cranes are in a vertical state, so that the stability of hoisting cables in a working state is ensured. The bridge deck crane 4 can move longitudinally on the bridge deck, drives the hoisting cable 3 and the bridge section 2 to be assembled to move towards two sides, and then returns to the initial hoisting position beside the pier.
Preferably, the beam is provided with a stabilizing cable 5, one end of the stabilizing cable is fixedly connected with the bridge section to be assembled, the other end of the stabilizing cable is respectively connected with the beam part above the pier 8 and the last assembled bridge section, the stabilizing cable is moved once when the bridge section 2 to be assembled is assembled, and the stabilizing cable 5 is used for reducing wind-induced vibration in the transportation and walking process of the bridge section 2 to be assembled.
As shown in fig. 1, the utility model discloses a when the initial state of system is assembled to precast cantilever of prestressed concrete box girder segment section, treat to assemble bridge section 2 and place on other hanging beam platform 1 of mound, and treat to assemble the butt joint face of bridge section 2 and place in the one side that is close to pier 8 to when the bridge floor docks, do not need the conversion direction. The bridge deck crane 4 is located at the initial hoisting position beside the pier, the hoisting guy cable 3 connected with the bridge deck crane extends to be just connected with the bridge section 2 to be assembled, and meanwhile, the stabilizing guy cable 5 is installed in place to wait for starting.
As shown in fig. 2, the utility model discloses a when the vertical beam section that lifts by crane of system is assembled to precast cantilever of prestressed concrete box girder segment section, along with the shrink that lifts by crane cable 3, wait to assemble bridge section 2 and be drawn gradually along vertical direction and hang to being close the bridge floor below, stabilize simultaneously cable 5 along with waiting to assemble the continuous promotion of bridge section 2, also constantly make the shrink of relativity, make and wait to assemble the ascending in-process of bridge section 2 and be in vertical stable condition always.
As shown in fig. 3, the utility model discloses a precast cantilever system of assembling of prestressed concrete box girder segment section is in the same direction as the bridge to transporting the beam section stage, and bridge floor crane 4 is to the both sides migration, drives to lift by crane cable 3 and wait to assemble bridge section 2 and remove to the bridge floor both sides and assemble the bridge segment section outside to, and fig. 6 is the utility model discloses a system cross section schematic diagram is assembled to the cantilever that system of assembling of precast cantilever of prestressed concrete box girder segment section relates to, combines fig. 3, and bridge floor crane 4 includes: the pulley and winding machine lifting equipment 9 and the bridge girder erection 12 are symmetrically arranged above two sides of the bridge girder erection 12, the pulley and winding machine lifting equipment 9 are respectively connected with the lifting guy cable 3, the widths of the bridge girder erection 12 and the lifting guy cable 3 are larger than the width of the spliced girder section 10, the lower end of the lifting guy cable 3 is connected with the shoulder pole beam 14 and is lifted below the spliced girder section 10, the bridge girder section to be spliced 2 is provided with the lifting point 11 which is lifted through the shoulder pole beam 14, the bridge girder erection 12, the spliced girder section 10, the shoulder pole beam 14 and the bridge girder section to be spliced 2 are kept in a parallel state in the lifting and moving processes, and the bridge girder section to be spliced 2 is lifted and moved below the spliced girder 10 to wait for the upward lifting of the bridge girder section to be spliced 2.
As shown in fig. 4, the bridge sections 2 to be assembled at the two ends are lifted to the sections to be assembled of the assembled bridge sections simultaneously under the upward gravitational action of the hoisting guy cable, after accurate alignment, epoxy resin glue is applied by a dry joint method, prestress is tensioned, the assembly of the bridge sections 2 to be assembled is completed, and the bridge crane 4 moves back to the initial hoisting position beside the pier.
In fig. 3 and 4, the bridge crane 4 may be a cable traction system or a walking hydraulic traveling system, preferably, a combined fast and slow combined traveling system is adopted, the walking hydraulic traveling system is adopted during the process that the bridge crane 4 drives the bridge section 2 to be assembled to the load walking of the front end of the cantilever, so as to ensure the stability and better adapt to the influence of the longitudinal slope of the line, and when the bridge crane 4 returns to lift a section of the bridge section 2 to be assembled in a no-load manner, the cable traction system or the wheel-track type traveling system is adopted to accelerate the traveling speed.
A precast cantilever assembly system for a prestressed concrete box girder segment is disclosed, and a construction method comprises the following steps:
s1: the bridge section 2 to be assembled is prefabricated in a concentrated section at the pier, the template adopts a customized adjustable steel mould, concrete is intensively mixed by a mixing station, a concrete conveying vehicle is transported to the site, an automobile pump pumps the concrete into the mould, mechanical vibration construction is carried out, and the quality of the bridge section is ensured. And after the prefabrication of the assembled bridge section 2 is finished, the bridge section is hung to the pier-side hanging beam platform 1. The bridge position limiting device can be suitable for bridge positions with limited transportation conditions under various bridges, such as V-shaped canyon zones, land with limited transportation conditions, mudflat zones and zones inconvenient for segmental transportation.
S2: the bridge deck crane 4 is located at the initial hoisting position beside the pier, the hoisting cables 3 on the two sides extend to the bridge bottom to reach the hoisting point of the bridge section 2 to be assembled, and the stabilizing cables 5 are fixed well.
S3: under the action of upward pulling force of the hoisting inhaul cable 3, the bridge section 2 to be assembled continuously vertically moves upwards to be close to the lower edge of the assembled bridge section, and the length of the stabilizing cable 5 is continuously adaptively adjusted, so that the bridge section 2 to be assembled stably rises.
S4: the bridge deck crane 4 moves towards two ends of the bridge deck to drive the hoisting guy cable 3 and the bridge section 2 to be spliced to move towards the horizontal direction of the two ends of the bridge deck to the front of the spliced beam section.
S5: the bridge deck crane 4 lifts the bridge section 2 to be assembled to be level with the spliced beam section under the upward acting force of the bridge deck crane 4 and the lifting stay ropes 3, then the bridge deck crane 4 carries out temporary anchoring, and the bridge section 2 to be assembled and the spliced beam section are accurately aligned.
S6: epoxy resin glue is coated by a dry joint method, the bridge section 2 to be assembled is assembled after prestress is tensioned, the prestress tensioning is controlled by tension force and elongation value, the bridge deck crane 4 moves back to the initial position of hoisting beside the pier, the hoisting cable 3 is extended to the hoisting point of the hoisting beam platform beside the pier under the bridge and connected with the next bridge section 2 to be assembled, and the process is repeated in a circulating mode to complete the segment assembly of all the bridge sections.
The utility model discloses a precast cantilever assembly method of prestressed concrete box girder segment section compares conventional construction method, has avoided high altitude cantilever casting operation, and construction operation is simple and convenient, very big reduction the construction risk. Just the utility model discloses construction cycle compares conventional cantilever construction method and has shortened 30%, compares the cantilever construction method of big segment optimization and has shortened 20%, and the construction cycle advantage is outstanding.
Preferably, as shown in fig. 5, the girder is symmetrically provided with segment transportation trolleys 6, and the two ends of the assembled bridge are provided with cantilever front-end cranes 15, the segment transportation trolleys 6 can move back and forth on the bridge floor, and the segment transportation trolleys 6 are used for transporting the bridge segments 2 to be assembled, which are hoisted to the bridge floor by the beam segment hoisting station 7, to the positions to be assembled on the two sides of the bridge floor and conveying the bridge segments to the cantilever front-end cranes 15. A prestressed concrete box girder segment precast cantilever assembling system is characterized in that when a segment transport trolley 6 and a cantilever front end crane 15 are arranged on a bridge floor, the operation and assembling method comprises the following steps:
s1: the bridge section 2 to be assembled is prefabricated in a concentrated section at the bridge pier, the template adopts a customized adjustable steel mold, concrete is intensively mixed by a mixing station, a concrete conveying vehicle is transported to the site, and the concrete is pumped into the mold by an automobile pump and is mechanically vibrated and constructed. And after the prefabrication of the assembled bridge section 2 is finished, the bridge section is hung to the pier-side hanging beam platform 1.
S2: the beam section lifting station 7 is located at the initial lifting position beside the pier, the lifting guy cables 3 on the two sides extend to the bridge bottom to reach the lifting point of the bridge section 2 to be assembled, and the stabilizing cable 5 is fixed well.
S3: under the action of upward tension of the hoisting inhaul cable 3, the bridge section 2 to be assembled continuously vertically moves upwards to the bridge floor, and the length of the stabilizing cable 5 is continuously adjusted to ensure the stability of the bridge section 2 to be assembled.
S4: the bridge section 2 to be assembled is unloaded and transported to the cantilever front end cranes 15 at two ends through the section transportation trolley 6, at the moment, slings on the beam section lifting station 7 extend to the part of the hanging beam platform 1 beside the pier below the bridge to wait for lifting the next bridge section 2 to be assembled, and the section transportation trolley 6 also returns to the initial lifting position beside the pier to wait for next transportation.
S5: under the hoisting action of the crane 15 at the front end of the cantilever, the bridge section 2 to be spliced and the spliced beam section are accurately aligned. And (3) applying an epoxy resin adhesive by a dry joint method, and tensioning the prestress to complete the assembly of the bridge section 2 to be assembled.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (5)
1. A prestressed concrete box girder segment prefabricated cantilever assembling system comprises a bridge pier (8) and pier-side hanging girder platforms (1) arranged on two sides of the bridge pier (8), and is characterized by further comprising a hanging cable (3) and a bridge deck crane (4); wherein,
the bridge deck crane is characterized in that a bridge section (2) to be assembled is placed on the pier-side hanging beam platform (1), the bridge deck crane (4) is arranged on two sides of a bridge deck, and the bridge deck crane (4) is connected with the bridge section (2) to be assembled through the hoisting inhaul cable (3) to realize the hoisting of the bridge section; the bridge deck crane (4) comprises pulleys, a yard machine lifting device (9) and a bridge girder erection machine truss (12), wherein the pulleys and the yard machine lifting device (9) are symmetrically arranged on two sides of the bridge girder erection machine truss (12) respectively, and the pulleys and the yard machine lifting device (9) are connected with the lifting guy cable (3) respectively; the bridge deck crane (4) adopts a cable traction system or a walking hydraulic walking system or the combination of the cable traction system and the walking hydraulic walking system to move towards two sides of the bridge section (2) to be assembled.
2. The precast cantilever assembly system of the prestressed concrete box girder segment according to claim 1, wherein the lower end of the hoisting cable (3) is connected with a carrying pole beam (14), and the bridge section (2) to be assembled is provided with a hoisting point (11).
3. The precast cantilever erection system of claim 2, wherein the bridge girder erection machine (12), the erected girder segment (10), the carrying pole girder (14) and the bridge segment to be erected (2) are kept parallel.
4. The precast cantilever assembling system of the prestressed concrete box girder segment according to claim 1, wherein a stabilizing cable (5) is further provided, one end of which is fixedly connected with the bridge segment (2) to be assembled and the other end of which is respectively connected with the girder segment above the pier (8) and the final assembled bridge segment.
5. The precast cantilever assembly system of a prestressed concrete box girder segment according to claim 1, further comprising a segment transporting carriage (6), a girder segment lifting station (7), and a cantilever front end crane (15) provided with both ends of the cantilever.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821603304.7U CN209024979U (en) | 2018-09-29 | 2018-09-29 | A kind of prestressed concrete box girder precast segment free cantilever erection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821603304.7U CN209024979U (en) | 2018-09-29 | 2018-09-29 | A kind of prestressed concrete box girder precast segment free cantilever erection system |
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| CN209024979U true CN209024979U (en) | 2019-06-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109137759A (en) * | 2018-09-29 | 2019-01-04 | 中铁第四勘察设计院集团有限公司 | A kind of prestressed concrete box girder precast segment cantilever assembling method and system |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109137759A (en) * | 2018-09-29 | 2019-01-04 | 中铁第四勘察设计院集团有限公司 | A kind of prestressed concrete box girder precast segment cantilever assembling method and system |
| CN109137759B (en) * | 2018-09-29 | 2023-12-19 | 中铁第四勘察设计院集团有限公司 | Precast cantilever assembling method and system for prestressed concrete box girder segment |
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