CN105735139B - Supporting system for construction of cast-in-situ box beam in overpass and construction method of box beam - Google Patents
Supporting system for construction of cast-in-situ box beam in overpass and construction method of box beam Download PDFInfo
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- CN105735139B CN105735139B CN201610229720.4A CN201610229720A CN105735139B CN 105735139 B CN105735139 B CN 105735139B CN 201610229720 A CN201610229720 A CN 201610229720A CN 105735139 B CN105735139 B CN 105735139B
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/268—Composite concrete-metal
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a supporting system for the construction of a cast-in-situ box beam in an overpass and a construction method of the box beam. The supporting system comprises a cast-in-situ box beam bottom section steel support system, a displacement monitoring system and a full support; the cast-in-situ box beam bottom section steel support system comprises a concrete strip foundation, a steel pipe stand column, a lower cross beam, an upper cross beam, a self-locking jack and a longitudinal beam; the displacement monitoring system comprises a profile steel nose beam, an aluminum alloy guide rail and a laser displacement sensor. The construction method of the box beam comprises the following steps: 1, mounting an existing cast-in-situ box beam bottom section steel support system; 2, mounting the jack and the displacement monitoring system; 3, constructing the full support at the top of a cast box beam; 4, pre-pressing the support; 5, erecting a formwork and pouring concrete. According to the supporting system and the construction method disclosed by the invention, the construction of to-be-casted box beams above the cast box beam can be realized; the construction of the overcrossing to-be-casted box beams is performed through erecting the support system at the bottom of the completed cast-in-situ box beam and erecting the full support on the support system, so that the effects of being short in construction period, economic, safe and reliable are achieved.
Description
Technical field
The invention belongs to technical field of road construction, more particularly to a kind of support for viaduct construction of cast-in-situ box-beam
System, and the construction method of the box beam using the support system.
Background technology
With sharply increasing for rapid development of economy and the modern means of communication, viaduct in terms of traffic pressure is alleviated just
Increasing effect is played, therefore is widely used in highway and urban road, also further promoted bridge
The development of technology.
Mutilevel overpass, due to the mutual leap being related on vertical space, certainly will cause that what is constructed to interfere, therefore set
Sequence of construction follows low after time first height after the former head on meter, while cost, duration and technology are taken into account in bridge superstructure type selecting,
Thus full framing cast-in-situ concrete continuous box beam because its economy, technology maturation and extensively applied in viaduct.
Due to adopting floor stand, so needing when scissors crossing is designed and constructed using technological process low after first height.But
It is the major trunk roads of two leaps that intersect in road event practice（At a high speed）Highway, typically belongs to disparity items legal person,
Although design can be coordinated, often because starting date is different, the duration is different, cause down to wear the leading construction problem of overpass,
This results in the problem that the full framing across the cast-in-place box bridge of full framing cannot be set up, if full framing ridden upon
Jing is poured in the box beam for completing, and may cause to have poured the damage of box beam, if carrying out structure change temporarily, such as the change of overpass beam
Into cantilever across Hanging Basket greatly or steel box-girder assembling scheme, the duration is not only extended, and considerably increase cost.
The content of the invention
The first object of the present invention is to provide a kind of support system for viaduct construction of cast-in-situ box-beam.
The second object of the present invention is to provide a kind of construction method of box beam.
In order to realize above-mentioned first purpose, the present invention provides a kind of support system for viaduct construction of cast-in-situ box-beam,
The system is used to pour the construction of the box beam to be poured above box beam, and the box beam bottom of having poured has passive pier stud；
It includes：Box beam bottom shape steel bracket system, displacement monitoring system and full framing；
The box beam bottom shape steel bracket system includes：
Concrete continuous footing, the concrete continuous footing is arranged on the ground immediately below the web for pouring box beam,
It is vertical with web；The quantity of concrete continuous footing is multiple, is be arranged in parallel each other；
Steel pipe post, the steel pipe post is vertical with the concrete continuous footing to be fixedly connected, each concrete bar shaped
Basis is equipped with many steel pipe posts, linear type arrangement；
Sill, the sill is arranged on many steel pipe posts of linear type arrangement；
Entablature, the entablature is located at sill top；
Self-locking jack, the self-locking jack is arranged between the sill and entablature；
Longeron, the longeron is arranged on the top of entablature, vertical with the entablature, and positioned at pouring the abdomen of box beam
Plate lower section；
The displacement monitoring system includes：
Shaped steel nose girder, the two ends of the shaped steel nose girder are fixedly connected respectively with adjacent pier stud, and the quantity of shaped steel nose girder is
Two, it be arranged in parallel each other；
Aluminum alloy guide rail, the aluminum alloy guide rail is fixed between two root type steel nose girders；
Laser displacement sensor, the laser displacement sensor is fixed on the aluminum alloy guide rail；And,
The full framing rides upon and pour box beam top.
The support system for being used for viaduct construction of cast-in-situ box-beam as above of the invention, further, the concrete fin
Shape basis top has pre-embedded bolt, and steel pipe post bottom arranges ring flange, realizes that steel pipe stands by pre-embedded bolt and ring flange
Post is fixedly connected with concrete continuous footing.
The support system for being used for viaduct construction of cast-in-situ box-beam as above of the invention, further, the box beam bottom
Shape steel bracket system also include rubber blanket, the rubber blanket be arranged on longeron and poured box beam web between.
The support system for being used for viaduct construction of cast-in-situ box-beam as above of the invention, further, the entablature is
Two bors d's oeuveres I-steel；The sill is Two bors d's oeuveres I-steel.
In order to realize above-mentioned second purpose, the present invention provides a kind of construction method of box beam, comprises the following steps：
Step 1, existing cast-in-situ box girder bottom shape steel bracket system is installed；
A, concrete continuous footing are poured；The casting concrete strip footing along ground immediately below box girder web, concrete
Strip footing top pre-embedded bolt, for the connection of steel pipe post flange；
B, steel pipe post are installed；Steel pipe post, steel pipe post bottom mounting flange are installed at the top of concrete continuous footing
Disk, is fixed by ring flange with the pre-embedded bolt in concrete continuous footing；
C, longeron are installed；Box beam per pass web divides into 2 longerons；
D, crossbeam are installed；Crossbeam adopts I-steel, if Dual-layer beam structure, is used to pacify between entablature and sill
Put self-locking jack；
Step 2, self-locking jack and displacement monitoring system are installed；
A, self-locking jack are installed；Self-locking jack is arranged between entablature and sill；
B, guide rails assembling；Pouring between two pier studs of box beam erection shaped steel nose girder, shaped steel nose girder in addition to contacting with bridge pier,
Without any contact between ground, box beam；Aluminum alloy guide rail is set between two root type steel nose girders, and it is fixed on aluminum alloy guide rail
Laser displacement sensor set, the laser displacement sensor installed in laser displacement sensor set is used for the shape that box beam has been poured in monitoring
Change situation；
C, the landing stage of scaffold are set up；The scaffolding platform by steel pipe post, for laying hydraulic pressure unit, the hydraulic pressure unit
For driving self-locking jack to work；There is walking channel between each landing stage of scaffold to be examined on the spot to equipment working condition
Look into；
Control room under d, bridge；Control room is set up under existing cast-in-situ box girder；The cable being connected with laser displacement sensor connects
It is connected under bridge and controls interior, laser displacement sensor is monitored and to self-locking jack by controlling the computer of interior under bridge
It is controlled；
E, according to the indicating value of laser displacement sensor, it is determined that having poured box beam initial baseline plane；
Step 3, has poured box beam top Full space support construction；Construction full framing, the cushioning below the collet of full framing
Channel-section steel, channel-section steel is longitudinally laid along existing cast-in-situ box girder, to improve the force-bearing situation of full framing；
Step 4, pre-pressing bracket；To guarantee construction safety, precompressed is carried out to full framing, precompressed adopts sand pocket；Plus load-carrying
Amount is more than construction loads；By precompressed data, the camber of existing cast-in-situ box girder is set；
Step 5, formwork erection and casting concrete；In work progress, laser displacement sensor can accurately and comprehensively reflect existing
The change in displacement of cast-in-situ box girder, self-locking jack can reflect existing cast-in-situ box girder each point stressing conditions, and to cast-in-place case
Liang Sicheng is adjusted, make existing cast-in-situ box girder deformation be constantly in can survey, controllable state.
The construction method of box beam as above of the invention, it is preferable that in step 1, between longeron and box beam bottom contact surface
Whole cushioning white rubber pads, to prevent unbalance stress and box beam Local Loads excessive；It is described vertical in a kind of specific embodiment
Beam is H600 shaped steel.
The construction method of box beam of the invention as above, it is preferable that in step 1, between entablature and sill between
Gap is controlled in 150mm or so, and self-locking jack is placed in gap after installing, and using the steel plate of 20mm the auxiliary of gap is carried out
Help adjustment.
The construction method of box beam as above of the invention, it is preferable that in step 3, full framing adopts HR weight adjustables
Type door-type scaffold is set up.
The construction method of box beam as above of the invention, it is preferable that in step 4, loaded weight is about construction loads
120%.
The invention has the beneficial effects as follows：
During using support system of the present invention and box girder construction method, precompressed is carried out to full framing, set by precompressed data
Put the camber of existing cast-in-situ box girder；By laser displacement sensor and self-locking jack system, realization has poured box beam to lower floor
Synchronization monitoring and bit shift compensation.Poured in the box beam for completing full framing is ridden upon so as to ensure that, Ran Houjin
It is not result in have poured box beam damage during row construction of cast-in-situ box-beam.Additionally, laser displacement sensor can accurately and comprehensively reflect existing
The change in displacement of cast-in-situ box girder, make existing cast-in-situ box girder deformation be constantly in can survey, controllable state.
The introducing that the present invention passes through box beam bottom shape steel bracket system, can make full use of the Cast-in-situ Beam for completing of having constructed,
Full framing is set up thereon, upper strata cast-in-place box beam bracket is not only solved and is set up problem safely, and accelerate construction speed,
Reduce the input of the temporary structures such as support.And monitoring is synchronized by laser displacement sensor and self-locking jack system
With microspur compensation, safe early warning and control work have been carried out effectively, in time, will not cause any infringement to completing box beam,
Remarkable in economical benefits.
Description of the drawings
By the detailed description made in conjunction with the following drawings, above-mentioned and/or other aspects of the present invention and advantage will become
Become apparent from and be easier to understand, these accompanying drawings are simply schematic, are not intended to limit the present invention, wherein：
Fig. 1 is sectional schematic diagram of the present invention for the support system of viaduct construction of cast-in-situ box-beam；
Fig. 2 is side schematic view of the present invention for the support system of viaduct construction of cast-in-situ box-beam；
Fig. 3 is the steel pipe post and its connection diagram of an embodiment of the present invention；
Fig. 4 is the A-A tangent plane schematic diagrames of Fig. 1；
Fig. 5 is the scheme of installation of laser displacement sensor, shaped steel nose girder and aluminum alloy guide rail；
Fig. 6 is the construction method flow chart of viaduct cast-in-situ box girder.
In accompanying drawing, the list of parts representated by each label is as follows：
1st, concrete continuous footing, 2, steel pipe post, 3, ring flange, 4, pre-embedded bolt, 5, entablature, 6, sill, 7,
Longeron, 8, laser displacement sensor, 9, shaped steel nose girder, 10, aluminum alloy guide rail, 11, self-locking jack, 12, poured box beam, 13,
Full framing, 14, box beam to be poured, 15, bridging, 16, the landing stage of scaffold, 17, Control Room under bridge, 18, rubber blanket, 19, pier stud.
Specific embodiment
Hereinafter, the support system and box beam for viaduct construction of cast-in-situ box-beam of the present invention are described with reference to the accompanying drawings
Construction method embodiment.
The embodiment that here is recorded is the specific specific embodiment of the present invention, for illustrating the design of the present invention,
It is explanatory and exemplary, should not be construed as the restriction to embodiment of the present invention and the scope of the invention.Except here record
Implement exception, those skilled in the art can also be based on the application claims and specification disclosure of that using aobvious
Other technical schemes being clear to, these technical schemes include any obvious using making for the embodiment recorded to here
The technical scheme of substitutions and modifications.
The accompanying drawing of this specification is schematic diagram, aids in illustrating the design of the present invention, it is schematically indicated the shape of each several part
And its correlation.Note that for the ease of clearly showing the structure of each part of the embodiment of the present invention, between each accompanying drawing
Do not draw according to identical ratio.Identical reference marker is used to represent identical part.
Fig. 1 illustrates the support system for viaduct construction of cast-in-situ box-beam of an embodiment of the present invention, and the system is used for
The construction of the box beam to be poured 14 of the top of box beam 12 has been poured, and the bottom of box beam 12 of having poured has passive pier stud 19；Its
Including：Box beam bottom shape steel bracket system, displacement monitoring system and full framing；
The box beam bottom shape steel bracket system includes：
Concrete continuous footing 1, the concrete continuous footing 1 is arranged on the ground immediately below the web for pouring box beam
On, it is vertical with web；The quantity of concrete continuous footing is multiple, is be arranged in parallel each other；
Steel pipe post 2, the steel pipe post 2 is vertical with the concrete continuous footing 1 to be fixedly connected, each concrete fin
Shape basis 1 is equipped with many steel pipe posts 2, linear type arrangement；
As shown in figure 4, the concrete continuous footing top has pre-embedded bolt 4, steel pipe post bottom arranges ring flange
3, being fixedly connected for steel pipe post 2 and concrete continuous footing 1 is realized by pre-embedded bolt 4 and ring flange 3.
Sill 6, the sill 6 is arranged on many steel pipe posts 2 of linear type arrangement；
Entablature 5, the entablature 5 is located at the top of the sill 6；In a kind of specific embodiment, the entablature
For Two bors d's oeuveres I-steel；The sill is Two bors d's oeuveres I-steel.The Two bors d's oeuveres I-steel is welded side by side by two same model I-steel
Form.
Self-locking jack 11, the self-locking jack 11 is arranged between the sill 6 and entablature 5；Using computer
And hydraulic pressure unit control self-locking jack working condition；
Longeron 7, the longeron 7 is arranged on the top of entablature 5, vertical with the entablature 5, and box beam is poured positioned at
Web lower section；
The displacement monitoring system includes：
Shaped steel nose girder 9, the two ends of the shaped steel nose girder 9 are fixedly connected respectively with adjacent pier stud 19, the number of shaped steel nose girder 9
Measure as two, be arranged in parallel each other；
Aluminum alloy guide rail 10, the aluminum alloy guide rail 10 is fixed between two root type steel nose girders 9；
Laser displacement sensor 8, the laser displacement sensor 8 is fixed on the aluminum alloy guide rail 10, using computer
Laser displacement sensor is monitored；And,
13 framves of the full hall ride upon and pour the top of box beam 12.
As shown in figure 3, the box beam bottom shape steel bracket system also includes rubber blanket 18, the rubber blanket 18 is arranged on vertical
Beam 7 and poured box beam web between.The effect of rubber blanket 18 is to prevent unbalance stress and box beam Local Loads excessive.
The box girder construction method bag carried out using the support system for viaduct construction of cast-in-situ box-beam of above-described embodiment
Include following steps：
Step 1, existing cast-in-situ box girder bottom shape steel bracket system is installed；
A, concrete continuous footing are poured；Cleaning leveling, longitudinal direction ground immediately below box girder web are carried out to box beam bottom ground
C25 concrete concrete continuous footings, concrete continuous footing section width 1.2m, high 0.5m, concrete continuous footing top are poured on base
Pre-embedded bolt, for the connection of steel pipe post flange；
B, steel pipe post are installed；Steel pipe post, steel pipe post bottom mounting flange are installed at the top of concrete continuous footing
Disk, is fixed by ring flange with the pre-embedded bolt in concrete continuous footing；In a kind of specific embodiment, steel pipe post is φ
600, the steel pipe of wall thickness 8mm.
C, longeron are installed；Box beam per pass web divides into 2 longerons；Top section longitudinal beam is installed by loading machine auxiliary positioning,
Longeron is fixed using temporary support, and temporary support is referred to founds steel pipe support (steel pipe of the support system that staggers) from ground,
For interim fixed；Whole cushioning white rubber pads between longeron and box beam bottom contact surface, to prevent unbalance stress and box beam office
Portion's load is excessive；In a kind of specific embodiment, the longeron is H600 shaped steel；
D, crossbeam are installed；Crossbeam adopts No. 45 I-steel of Two bors d's oeuveres, if Dual-layer beam structure, is used between two-layer crossbeam
Lay jacking self-locking jack；After longeron is installed, crossbeam is arranged on into box beam using the cucurbit arranged on box girder bridge face
Bottom, and fix temporarily（The support that can pass through on box girder bridge face is realized, hung similar to counter.）；In a kind of specific embodiment,
Crossbeam adopts No. 45 I-steel of Two bors d's oeuveres；
Step 2, self-locking jack and displacement monitoring system are installed；
A, self-locking jack are installed；For convenience of the installation and the process in pre- jacking space of self-locking jack, between two-layer crossbeam
Gap is controlled in 150mm or so, and self-locking jack is placed in gap after installing, and using the steel plate of 20mm the auxiliary of gap is carried out
Adjustment is helped, sedimentation compensation is carried out to beam base plate using self-locking jack；
B, guide rails assembling；Pouring between two pier studs of box beam erection shaped steel nose girder, shaped steel nose girder in addition to contacting with bridge pier,
Without any contact between ground, box beam；Aluminum alloy guide rail is set between two root type steel nose girders, and it is fixed on aluminum alloy guide rail
Laser displacement sensor set, the laser displacement sensor installed in laser displacement sensor set is used for the shape that box beam has been poured in monitoring
Change situation；
C, the landing stage of scaffold are set up；The scaffolding platform 16 by steel pipe post, for laying hydraulic pressure unit, the hydraulic pressure list
Unit is used to drive self-locking jack to work；There is walking channel between each landing stage of scaffold 16 to carry out on the spot to equipment working condition
Check；
Control room 17 under d, bridge；Control room 17 is set up under existing cast-in-situ box girder；The line being connected with laser displacement sensor
Cable is connected under bridge and controls interior, laser displacement sensor is monitored and to self-locking thousand by controlling the computer of interior under bridge
Jin top is controlled；
E, according to the indicating value of laser displacement sensor, it is determined that having poured box beam initial baseline plane；
Step 3, has poured box beam top Full space support construction；Full framing is set up using HR adjustable heavy duty door-type scaffolds,
Set up conveniently, it is safe and reliable；To prevent existing box beam top surface Local Loads excessive, using the cushioning below the collet of full framing
The method of No. 20 channel-section steels, channel-section steel is longitudinally laid along existing cast-in-situ box girder, to improve the force-bearing situation of full framing；
Step 4, pre-pressing bracket；To guarantee construction safety, precompressed is carried out to full framing, precompressed adopts sand pocket；Plus load-carrying
Measure as the 120% of construction loads；By precompressed data, the camber of existing cast-in-situ box girder is set；
Step 5, formwork erection and casting concrete；In work progress, laser displacement sensor can accurately and comprehensively reflect existing
The change in displacement of cast-in-situ box girder, self-locking jack can reflect existing cast-in-situ box girder each point stressing conditions, and to cast-in-place case
Liang Sicheng is adjusted, make existing cast-in-situ box girder deformation be constantly in can survey, controllable state.
In road event practice, the major trunk roads of two leaps that intersect（At a high speed）Highway, typically belongs to different item
Mesh legal person, although can coordinate design, but often because starting date is different, the duration is different, causes down to wear overpass and applies in advance
Work problem, this results in the problem that the full framing across the cast-in-place box bridge of full framing cannot be set up, if by full framing
Ride upon and poured in the box beam for completing, may cause to have poured the damage of box beam, if carrying out structure change temporarily, such as on across
Bridge is altered to big across Hanging Basket cantilever or steel box-girder assembling scheme, not only extends the duration, and considerably increases cost.
During using support system of the present invention and box girder construction method, precompressed is carried out to full framing, set by precompressed data
Put the camber of existing cast-in-situ box girder；The regulation of camber is realized by self-locking jack.So as to ensure that by full framing
Ride upon and poured in the box beam for completing, then carry out being not result in pour box beam damage during construction of cast-in-situ box-beam.Additionally, swashing
Optical displacement sensor can accurately and comprehensively reflect the change in displacement of existing cast-in-situ box girder, make the deformation of existing cast-in-situ box girder always
In can survey, controllable state.
Each technical characteristic of above-mentioned disclosure is not limited to disclosed and further feature combination, and those skilled in the art are also
Can according to the purpose of invention carry out between each technical characteristic other combination, to realize that the purpose of the present invention is defined.
Claims (8)
1. a kind of support system for viaduct construction of cast-in-situ box-beam, the box beam to be poured that the system is used to pouring above box beam
Construction, the box beam bottom of having poured has passive pier stud；Characterized in that, including：Box beam bottom shape steel bracket body
System, displacement monitoring system and full framing；
The box beam bottom shape steel bracket system includes：
Concrete continuous footing, the concrete continuous footing is arranged on the ground immediately below the web for pouring box beam, with abdomen
Plate is vertical；The quantity of concrete continuous footing is multiple, is be arranged in parallel each other；
Steel pipe post, the steel pipe post is vertical with the concrete continuous footing to be fixedly connected, each concrete continuous footing
It is equipped with many steel pipe posts, linear type arrangement；
Sill, the sill is arranged on many steel pipe posts of linear type arrangement；
Entablature, the entablature is located at sill top；
Self-locking jack, the self-locking jack is arranged between the sill and entablature；
Longeron, the longeron is arranged on the top of entablature, vertical with the entablature, and under the web for pouring box beam
Side；
The displacement monitoring system includes：
Shaped steel nose girder, the two ends of the shaped steel nose girder are fixedly connected respectively with adjacent pier stud, and the quantity of shaped steel nose girder is two,
It is arranged in parallel each other；
Aluminum alloy guide rail, the aluminum alloy guide rail is fixed between two root type steel nose girders；
Laser displacement sensor, the laser displacement sensor is fixed on the aluminum alloy guide rail；And,
The full framing rides upon and pour box beam top；
Concrete continuous footing top has pre-embedded bolt, and steel pipe post bottom arranges ring flange, by pre-embedded bolt and
Ring flange realizes being fixedly connected for steel pipe post and concrete continuous footing；
The box beam bottom shape steel bracket system also includes rubber blanket, and the rubber blanket is arranged on longeron and pours the web of box beam
Between.
2. the support system for viaduct construction of cast-in-situ box-beam according to claim 1, it is characterised in that the upper horizontal stroke
Beam is Two bors d's oeuveres I-steel.
3. the support system for viaduct construction of cast-in-situ box-beam according to claim 1, it is characterised in that the lower horizontal stroke
Beam is Two bors d's oeuveres I-steel.
4. a kind of construction method of box beam, it is characterised in that applied using the support system described in any one of claim 1-3
Work, comprises the following steps：
Step 1, existing cast-in-situ box girder bottom shape steel bracket system is installed；
A, concrete continuous footing are poured；The casting concrete strip footing along ground immediately below box girder web, concrete bar shaped
Basis top pre-embedded bolt, for the connection of steel pipe post flange；
B, steel pipe post are installed；Steel pipe post is installed at the top of concrete continuous footing, steel pipe post bottom fixed flange leads to
Cross ring flange to fix with the pre-embedded bolt in concrete continuous footing；
C, longeron are installed；Box beam per pass web divides into 2 longerons；
D, crossbeam are installed；Crossbeam adopts I-steel, if Dual-layer beam structure, is used to lay certainly between entablature and sill
Lock jack；
Step 2, self-locking jack and displacement monitoring system are installed；
A, self-locking jack are installed；Self-locking jack is arranged between entablature and sill；
B, guide rails assembling；Pouring between two pier studs of box beam erection shaped steel nose girder, shaped steel nose girder in addition to contacting with bridge pier, with ground
Without any contact between face, box beam；Aluminum alloy guide rail, and the fixed laser on aluminum alloy guide rail are set between two root type steel nose girders
Displacement transducer set, the laser displacement sensor installed in laser displacement sensor set is used for the deformation shape that box beam has been poured in monitoring
Condition；
C, the landing stage of scaffold are set up；The scaffolding platform by steel pipe post, for laying hydraulic pressure unit, the hydraulic pressure unit is used for
Drive self-locking jack work；There is walking channel between each landing stage of scaffold to carry out field review to equipment working condition；
Control room under d, bridge；Control room is set up under existing cast-in-situ box girder；The cable being connected with laser displacement sensor is connected to
Interior is controlled under bridge, is carried out to laser displacement sensor monitoring and to self-locking jack by controlling the computer of interior under bridge
Control；
E, according to the indicating value of laser displacement sensor, it is determined that having poured box beam initial baseline plane；
Step 3, has poured box beam top Full space support construction；Construction full framing, the cushioning channel-section steel below the collet of full framing,
Channel-section steel is longitudinally laid along existing cast-in-situ box girder, to improve the force-bearing situation of full framing；
Step 4, pre-pressing bracket；To guarantee construction safety, precompressed is carried out to full framing, precompressed adopts sand pocket；Loaded weight is big
In construction loads；By precompressed data, the camber of existing cast-in-situ box girder is set；
Step 5, formwork erection and casting concrete；In work progress, laser displacement sensor can accurately and comprehensively reflect cast-in-place
The change in displacement of box beam, self-locking jack can reflect existing cast-in-situ box girder each point stressing conditions, and to existing cast-in-situ box girder position
Shifting is adjusted, make existing cast-in-situ box girder deformation be constantly in can survey, controllable state.
5. the construction method of box beam according to claim 4, it is characterised in that in step 1, longeron and box beam bottom contact surface
Between whole cushioning white rubber pads, to prevent unbalance stress and box beam Local Loads excessive, the longeron is H600 shaped steel.
6. the construction method of box beam according to claim 4, it is characterised in that in step 1, between entablature and sill
Clearance control in 150mm or so, place self-locking jack in gap after installing, carry out gap using the steel plate of 20mm
Auxiliary adjustment.
7. the construction method of box beam according to claim 4, it is characterised in that in step 3, full framing can using HR
Heavy gate-type scaffold is adjusted to set up.
8. the construction method of box beam according to claim 4, it is characterised in that in step 4, loaded weight is about constructed
The 120% of load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610229720.4A CN105735139B (en) | 2016-04-14 | 2016-04-14 | Supporting system for construction of cast-in-situ box beam in overpass and construction method of box beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN106223201B (en) * | 2016-07-26 | 2018-06-26 | 中南大学 | The method for correcting error of beam section bridge linear monitoring |
| CN106988337B (en) * | 2017-04-20 | 2019-02-01 | 南京工大桥隧与轨道交通研究院有限公司 | It is a kind of for reducing the reinforcement means of bar shaped shallow foundation house differential settlement |
| CN108981590B (en) * | 2018-06-13 | 2020-10-23 | 中铁隧道集团二处有限公司 | High-speed railway precast beam positioning system |
| CN109056438B (en) * | 2018-09-06 | 2021-02-23 | 上海市机械施工集团有限公司 | Construction method for transformation of urban elevated ramp |
| CN110181650A (en) * | 2019-06-03 | 2019-08-30 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of prefabricated case beam template synchronous jacking system and its control method |
| CN111551326B (en) * | 2020-05-28 | 2022-01-28 | 广西交科集团有限公司 | Displacement monitoring method for settlement foundation layered casting concrete beam |
| CN113699890A (en) * | 2021-08-27 | 2021-11-26 | 上海市基础工程集团有限公司 | Automatic compensation method for temporary support elevation for bridge prefabricated assembly component |
| CN115198646B (en) * | 2022-07-14 | 2024-08-09 | 中国十九冶集团有限公司 | Method for erecting roadway for construction bridge |
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