CN106869038B - The auxiliary device and its construction method for preventing overpass from settling - Google Patents
The auxiliary device and its construction method for preventing overpass from settling Download PDFInfo
- Publication number
- CN106869038B CN106869038B CN201710170403.4A CN201710170403A CN106869038B CN 106869038 B CN106869038 B CN 106869038B CN 201710170403 A CN201710170403 A CN 201710170403A CN 106869038 B CN106869038 B CN 106869038B
- Authority
- CN
- China
- Prior art keywords
- support
- overpass
- settling
- bridge
- cushion cap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
Abstract
The present invention relates to Urban Bridge fields, disclose a kind of auxiliary device and its construction method for preventing overpass sedimentation, the device has the function of preventing overpass from settling, it includes auxiliary cushion cap and lateral Displacement supporting element, the auxiliary cushion cap is set in the pile foundation of overpass, and it is coated on the outside of the former cushion cap of overpass, the pier stud of overpass passes through the auxiliary cushion cap；The lateral Displacement supporting element includes support base and support frame, the support base is set to the outside on ground and being located at pier stud, the joint chair end of support frame as described above is connected on the support base, and support frame as described above connects at the position that beam-ends is connected to the bent cap of overpass and pier stud is connect.The present invention will assist cushion cap to be coated on outside former cushion cap, so that pier stud lower end is more firm, can prevent bridge from settling, and can effectively prevent bridge from laterally offset occurs using lateral Displacement supporting element, further the differential settlement of bridge be prevented to continue to increase.
Description
Technical field
The present invention relates to Urban Bridge fields, more particularly to a kind of auxiliary device for preventing overpass from settling and its construction
Method.
Background technique
Most of urban viaduct is mostly using this base form of pile foundation.However, Urban Bridge is normal
Multifactor influence can be faced during operation, to cause the differential settlement of bridge foundation.Moreover, when urban viaduct
When basis differential settlement occurs and needs to repair reinforcing, since newly-built pile foundation is closer with original structure pile foundations, if need to add
Solid pier stud old pile foundation and old cushion cap working condition it is poor, greater risk is had when boring pile driving construction, just in case collapse
The accidents such as hole will generate the influence for being difficult to estimate to original structure.
Summary of the invention
The object of the present invention is to provide a kind of auxiliary device for preventing overpass from settling and its construction methods, to solve city
The problem of foundation uneven settlement, occurs for overpass.
In order to solve the above technical problem, the present invention provides a kind of auxiliary devices for preventing overpass from settling comprising auxiliary
Cushion cap and lateral Displacement supporting element are helped, the auxiliary cushion cap is set in the pile foundation of overpass, and the original for being coated on overpass is held
The pier stud of the outside of platform, overpass passes through the auxiliary cushion cap；The lateral Displacement supporting element includes support base and support frame, institute
Support base is stated on ground and is located at the outside of pier stud, the joint chair end of support frame as described above is connected on the support base, described
Support frame connects at the position that beam-ends is connected to the bent cap of overpass and pier stud is connect.
Preferably, support frame as described above is obliquely installed relative to level ground, and the beam-ends that connects of support frame as described above is equipped with
First backing plate, support frame as described above are connected at the position that bent cap is connect with pier stud by first backing plate；Support frame as described above, pier
Column and ground form triangular structure.
Preferably, support frame as described above include the first support tube, the second support tube and third support tube, described first
Support tube and the second support tube are arranged in angle, and the beam-ends that connects of first support tube is connect with the beam-ends that connects of the second support tube,
The joint chair end of first support tube and the joint chair end interval of the second support tube are arranged, and the third support tube is connected to described the
Between one support tube and the second support tube.
Preferably, the support base includes brace foundation and limit base, and the brace foundation is set on ground, or
It is embedded in subsurface, the limit base is set on the brace foundation, and the joint chair end of support frame as described above is connected to the limit base
On.
Preferably, the limit base includes barricade and ruggedized construction, and the ruggedized construction is set to the barricade
The inside in outside, institute's barricade is equipped with the second backing plate, and the joint chair end of support frame as described above is connected to the gear by second backing plate
The inside of wall.
A kind of construction method for the auxiliary device for preventing overpass from settling, comprising the following steps:
(1) girder falling temporary support structure is installed
Bridge pier two sides installation temporary support component or Bailey bracket under the girder for being located at overpass face as girder falling
When support construction, specifically, the bottom end of temporary support component or Bailey bracket to be fixed on to the top of the former cushion cap of overpass, and will
The top of temporary support component or Bailey bracket acts against the bottom end of girder.
(2) lateral Displacement supporting element is installed
In support base of constructing out on the ground on the outside of pier stud, the joint chair end of support frame is fixed on support base, and
The beam-ends that connects of support frame is connected at the position that bent cap is connect with pier stud.
(3) steel pipe T beam support system is installed
First more steel-pipe piles are squeezed into compartment of terrain on the ground between adjacent pier stud, then again on the ground on pier stud periphery
Squeeze into more steel-pipe piles；
The upper end of these steel-pipe piles is extended close into bent cap bottom, and connector, the company are set in the upper end of steel-pipe pile
Fitting includes direction across bridge I-beam, steel plate and vertical bridge to I-beam, and the direction across bridge I-beam is located to the top of the steel-pipe pile
Portion, and steel plate is set at the top of direction across bridge I-beam, the vertical bridge is then connected to the steel plate to the lower end of I-beam
On, and then to the bent cap bottom end is withstood at the top of I-beam bridging is arranged between adjacent steel-pipe pile in vertical bridge；
(4) girder falling temporary support structure is removed
(5) construction auxiliary cushion cap
The foundation pit of construction auxiliary cushion cap is excavated out on the ground above pile foundation first, it is ensured that the side slope and level of foundation pit
The angle in face is in 45 degree, leaks out 30cm or more until excavating to the former cushion cap upper surface of overpass；In digging process, first carry out
It is thick to dig, it is thick to dig to more than design hole bottom absolute altitude 20~30cm, it is dug using essence；After excavation, foundation pit surfacing is overhauled；
Foundation pit setting-out is carried out, according to auxiliary cushion cap and foundation pit baseplane size, contour line survey in foundation pit baseplane is set to original
On ground；4 edge directions of the foundation pit Planar Contours on ground carry out section survey；It determines the depth for excavating skirt piles, presses
The width that slope is determined according to lower digging depth, will excavate on center pile layout to ground, and mark is arranged at this；It carries out at chisel pile crown
Reason and draining, after the completion of draining, the assembling reinforcement in foundation pit, cover to reinforcement uses rubber pad；In muti-piece template surface brushing
Mould oil, and the installation template in foundation pit are blocked in the joint of adjacent forms using sponge strip or double faced adhesive tape；
Dirt in cleaning template, reinforcing bar, then it is poured concrete, after concrete setting, maintenance and demoulding are carried out, is finally returned
Foundation pit is filled out, auxiliary bearing platform construction is completed.
Preferably, include: the step of construction lateral Displacement supporting element in step (2)
First backing plate is fixed at the position that bent cap is connect with pier stud, and is injected between the first backing plate is with the position
Adhesive；
Second backing plate is fixed on the inside of barricade, and injects adhesive between the second backing plate and barricade；
The beam-ends preload that connects of support frame is supported on the first backing plate, and the joint chair end of support frame is pre-tightened and supports to second
On backing plate, then the beam-ends that connects of support frame is welded on the first backing plate, and the joint chair end of support frame is welded to the second backing plate
On.
Preferably, temporary support component includes temporary support seat, more support columns, crossbeam, stulls in step (1)
Part and bracing element, the temporary support seat are set to the top of the former cushion cap of overpass, and the bottom end of the more support columns is connected to
On the temporary support seat, and the top of the more support columns is in the same plane, and the bottom end of the crossbeam is connected to more
The top of support column described in root, and the top of the crossbeam acts against the bottom end of girder, the Cross stay is connected to adjacent branch
Between dagger, and it is vertical with the support column, the bracing element is connected between adjacent support column, and between the Cross stay
Every.
Preferably, during step (3) construction steel tubular pole, with the heavy of every 2 hours 1 time frequency monitoring bridge
Drop；Specifically, first choose a pier stud as measuring basis, then at left and right sides of measuring basis and other each pier studs
2 monitoring points are each side set, datum mark are set within the scope of 10~20m of distance construction region, by the skill of second grade leveling
Art requires to measure；
With the horizontal displacement of every 2 hours 1 time frequency monitoring bridge；Specifically, in measuring basis and other each pier studs
Place left and right respectively sets 2 prisms, while the embedded 2 survey station points for having observation pier and a forced centering instrument are as monitoring criteria point, and 2
Relative accuracy between survey station point is monitored the horizontal displacement of bridge on survey station point 1/,250,000 or more；
With the fracture width of every 2 hours 1 time frequency monitoring bridge, crack is depicted at the position for first occurring crack on bridge
Distribution and and mark out the characteristic point position in crack, and measure the average crack width in these cracks；Then 5 width are selected
Length, width and the depth in this 5 standard specimen cracks are measured in the standard specimen crack that maximum crack is monitored as construction period.
Preferably, according to the monitoring result of work progress calculate the accumulative settling amount of bridge, accumulative horizontal displacement,
The rate of settling and horizontal displacement-pattern；It is greater than 0.3mm/d when the rate of settling is greater than 0.3mm/d or horizontal displacement rate of change, or
Accumulative settling amount is greater than 6mm or accumulative horizontal displacement is greater than 2mm, Ying Jiami monitoring frequency；
It is greater than 10mm when the rate of settling or horizontal displacement-pattern are greater than 0.3mm/d or accumulative settling amount for three days on end, or tired
It counts horizontal displacement and is greater than 3mm, should stop constructing immediately, improve monitoring frequency, and take measures to prevent pier stud from continuing that water occurs
Prosposition moves or sedimentation；
When sedimentation generates, mutation is greater than 5mm/d or horizontal displacement generation mutation is greater than 2mm/d or accumulative settling amount is more than
20mm or accumulative horizontal displacement are more than 5mm, should stop constructing immediately, and are taken measures to mitigate bridge load.
Preferably, during step (5) excavation pit, when digging to the position for having underground water, in foundation pit
Near construct out sump, and having gutter of constructing out between the position of underground water and sump, introducing the water into sump；
Wherein, the bottom width in gutter is 20cm, and the ditch depth in gutter is 20cm, and the sump is arranged one at interval of 20m, the collection
The length and width of well and high respectively 30cm, 30cm and 40cm；When gutter and sump cannot be arranged in Local topography, use
Water pumper is drained.
Preferably, the length and width of auxiliary cushion cap and high respectively 12.45m, 0.51m and 1.3m in step (5), the
The strength grade of two cushion caps is C40.
Preferably, in step (3) steel-pipe pile work progress, steel-pipe pile is first squeezed by ground using vibration hammer, when
When driving depth is to 8-9m, steel-pipe pile is continued using reaction frame to be pressed into ground.
A kind of auxiliary device for preventing overpass from settling provided by the present invention and its construction method, auxiliary cushion cap is set to
In the pile foundation of overpass, and it is coated on the outside of the former cushion cap of overpass, the pier stud of overpass passes through auxiliary cushion cap and grafting
Into former cushion cap, so that the lower end of pier stud is more firm, it can prevent bridge from settling, in addition, on the ground and positioned at pier
Support base is set on the outside of column, the joint chair end of support frame is connected on support base, and the beam-ends that connects of support frame is connected to bent cap
At the position being connect with pier stud, it can effectively prevent bridge from laterally offset occurs, further prevent the differential settlement of bridge
Continue to increase.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram for the auxiliary device for preventing overpass from settling of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the support frame of the embodiment of the present invention；
Fig. 3 is a kind of flow chart of the construction method for the auxiliary device for preventing overpass from settling in the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of steel pipe T beam support system in the embodiment of the present invention.
Wherein, 1, bent cap；2, cushion cap is assisted；3, pier stud；4, lateral Displacement supporting element, 41, support base；411, branch support group
Plinth；412, limit base；4121, barricade；4122, ruggedized construction；42, support frame；421, the first support tube；422, the second support
Pipe；423, third support tube；5, pile foundation；6, steel-pipe pile component；61, steel-pipe pile；62, connector；63, bridging；7, original is held
Platform.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
As shown in Figure 1, a kind of auxiliary device for preventing overpass from settling of the preferred embodiment of the present invention comprising auxiliary is held
Platform 2 and lateral Displacement supporting element 4, auxiliary cushion cap 2 are set in the pile foundation 5 of overpass, and be coated on the former cushion cap 7 of overpass
Outside, the pier stud 3 of overpass passes through auxiliary cushion cap 2 and is plugged in former cushion cap 7, so that the lower end of pier stud 3 is more firm, it can
Prevent bridge from settling；Lateral Displacement supporting element 4 includes support base 41 and support frame 42, and support base 41 is set on ground and position
In the outside of pier stud 3, the joint chair end of support frame 42 is connected on support base 41, and the beam-ends that connects of support frame 42 is connected to overpass
At the position that bent cap 1 is connect with pier stud 3, in use, lateral Displacement supporting element 4 can effectively prevent bridge from side occurs
To offset, further the differential settlement of bridge is prevented to continue to increase.
In order to enable support frame 42 effectively to prevent bridge laterally offset, support frame 42 is set relative to level ground inclination
It sets, and support frame 42, pier stud 3 and ground form triangular structure, so that support construction is more firm, it is preferred that supporting
Frame 42 connects beam-ends equipped with the first backing plate, and support frame 42 is connected at the position that bent cap 1 is connect with pier stud 3 by the first backing plate.
As shown in Fig. 2, support frame 42 include the first support tube 421, the second support tube 422 and third support tube 423, first
Support tube 421 and the second support tube 422 are arranged in angle, the first support tube 421 connect beam-ends and the second support tube 422 connect beam
The joint chair end interval of end connection, the joint chair end of the first support tube 421 and the second support tube 422 is arranged, and third support tube 423 connects
Between the first support tube 421 and the second support tube 422, the first support tube 421, the second support tube 422 and third support tube 423
" A " character form structure is formed, so that support frame 42 itself is more firm, improves the ability for resisting bridge laterally offset.Preferably,
The material that first support tube, the second support tube and third support tube use is steel pipe, specifically, being 325 × 12 seamless steel pipe of Φ.
Further, it is also possible to which other support tubes are arranged between pier stud 3 and support frame 42, one end of other support tubes is connected to pier stud 3
On, the other end is connected on support frame 42, to reinforce the stability of lateral Displacement supporting element 4.
In order to improve the intensity of support base 41, support base 41 includes brace foundation 411 and limit base 412, brace foundation 411
It is used to support limit base 412, brace foundation 411 can be set on ground, can also be embedded in subsurface, limit base 412 is set to
On brace foundation 411, the joint chair end of support frame 42 is connected on limit base 412, specifically, limit base 412 includes barricade 4121
With ruggedized construction 4122, ruggedized construction 4122 is set to the outside of barricade 4121, resists lateral force to improve barricade 4121
The inside of ability, barricade 4121 is equipped with the second backing plate, and the joint chair end of support frame 42 is connected to barricade 4121 by the second backing plate
Inside.
As shown in figure 3, prevent overpass settle auxiliary device construction method the following steps are included:
(1) girder falling temporary support structure is installed
Bridge pier two sides installation temporary support component or Bailey bracket under the girder for being located at overpass face as girder falling
When support construction, specifically, the bottom end of temporary support component or Bailey bracket to be fixed on to the top of the former cushion cap 7 of overpass, and
The top of temporary support component or Bailey bracket is acted against to the bottom end of girder.
Temporary support component includes temporary support seat, more support columns, crossbeam, Cross stay and bracing element, temporary support seat
Set on the top of the former cushion cap 7 of overpass, the bottom end of more support columns is connected on temporary support seat, and the top of more support columns
Hold in the same plane, the bottom end of crossbeam is connected to the top of more support columns, and the top of crossbeam acts against the bottom of girder
End, Cross stay are connected between adjacent support column, and vertical with support column, and bracing element connects between adjacent support column, and
With Cross stay interval, to improve the stability of support construction.In order to make temporary support component have enough strength supports, support column
Using 480 × 10 steel pipe of φ, crossbeam uses I-shaped gooseneck, and specially I25B model I-steel faces having a size of φ 219 × 10
When support base formed using 10mm and 18mm steel plate combination, model I36B, Cross stay and bracing element are using [16 channel steels, and horizontal
Support member and bracing element are all made of welding to be connected on support column.
(2) lateral Displacement supporting element 4 is installed
It constructs out on the ground for being located at the outside of pier stud 3 support base 41, the joint chair end of support frame 42 is fixed on support base
On 41, and the beam-ends that connects of support frame 41 is connected at the position that bent cap 1 is connect with pier stud 3.
Specifically, the step of construction lateral Displacement supporting element 4, includes:
First backing plate is fixed at the position that bent cap 1 is connect with pier stud 3, and is infused between the first backing plate is with the position
Enter adhesive, it is preferred that using the first steel plate as the first backing plate, first passing through the first high-strength bolt will be mounted on the first steel plate
At the position that bent cap 1 is connect with pier stud 3, steel bonding glue is injected between concrete and the first steel plate then at this location；
Second backing plate is fixed on the inside of barricade, and injects adhesive between the second backing plate and barricade, it is preferred that
Using the second steel plate as the second backing plate, first passes through the second high-strength bolt and is installed to the second steel plate on the inside of barricade 4121,
And steel bonding glue is injected between the second steel plate and the concrete of barricade 4121；
The beam-ends preload that connects of support frame 42 is supported on the first backing plate, and the joint chair end of support frame 42 is pre-tightened and is supported to
On second backing plate, then the beam-ends that connects of support frame 42 is welded on the first backing plate, and the joint chair end of support frame 42 is welded to
On second backing plate.
(3) steel pipe T beam support system is installed
As shown in figure 4, installation steel pipe T beam support system the following steps are included:
First more steel-pipe piles 61 are squeezed into compartment of terrain on the ground between adjacent pier stud 3, and the quantity of steel-pipe pile 61 is 3~6
The upper end of steel-pipe pile 61 is extended close to 1 bottom of bent cap, and connector 62 is arranged in the upper end of steel-pipe pile 61 by root, specifically,
According to force analysis, the connector 62 of use includes direction across bridge I-beam, steel plate and vertical bridge to I-beam, by direction across bridge I-beam
It is located at the top of steel-pipe pile 61, and steel plate is set at the top of direction across bridge I-beam, then connects vertical bridge to the lower end of I-beam
It is connected on steel plate, and by vertical bridge to the bottom end for withstanding bent cap 1 at the top of I-beam；Then it is arranged between adjacent steel-pipe pile 61
Skewed horizontal load part, it is preferred that be located at using bridging 63 between adjacent steel-pipe pile 61.
Then again on the ground on 3 periphery of pier stud, or more steel are squeezed on the ground of the side opposite with other pier studs 3
Then direction across bridge I-beam is located at steel likewise, the upper end of these steel-pipe piles to be extended close to the bottom of bent cap 1 by tubular pole
The top of tubular pole 61, and steel plate is set at the top of direction across bridge I-beam, vertical bridge is then connected to steel to the lower end of I-beam
On plate, and by vertical bridge to the bottom end for withstanding bent cap 1 at the top of I-beam；Then scissors is set between adjacent steel-pipe pile 61
Support.
In steel-pipe pile work progress, cause construction space insufficient in order to avoid being limited by bridge base space, first using vibration
Steel-pipe pile is squeezed into ground by hammer, when driving depth is to 8-9m, continues steel-pipe pile using reaction frame to be pressed into ground, reaction frame needs
Forcing checking is carried out, guarantees that the satisfactions specifications such as the internal force of reversed beam, the anti-overturning energy of support anchor force and concrete foundation are wanted
It asks.
Since in the construction process, gene vibration in ground may cause bridge foundation local subsidence or offset, therefore construct
During steel-pipe pile, with the sedimentation of every 2 hours 1 time frequency monitoring bridge；Specifically, first choosing a pier stud as measurement base
Standard, then at left and right sides of measuring basis and 2 monitoring points of each side setting of other each pier studs, in distance construction
Datum mark is set within the scope of 10~20m of region, is measured by the technical requirements of second grade leveling, specifically, using LeicaN3 essence
Quasi- level and the measurement of indium watt ruler；
With the horizontal displacement of every 2 hours 1 time frequency monitoring bridge；Specifically, in measuring basis and other each pier studs
Place left and right respectively sets 2 prisms, while the embedded 2 survey station points for having observation pier and a forced centering instrument are as monitoring criteria point, and 2
Relative accuracy between survey station point is monitored the horizontal displacement of bridge on survey station point, 1/,250,000 or more specifically, surveying
It is measured on website using total station and its mating prism；
With the fracture width of every 2 hours 1 time frequency monitoring bridge, crack is depicted at the position for first occurring crack on bridge
Distribution and and mark out the characteristic point position in crack, and measure the average crack width in these cracks；Then 5 width are selected
Length, width and the depth in this 5 standard specimen cracks are measured in the standard specimen crack that maximum crack is monitored as construction period, tool
Body, width is measured using Si Weier crack observer or scale microscope, it is true to be aided with core pulling detection using ultrasonic wave detector
Depthkeeping degree.
Accumulative settling amount, accumulative horizontal displacement, the rate of settling and the water of bridge are calculated according to the monitoring result of work progress
Flat rate of displacement；When the rate of settling is greater than 0.3mm/d or horizontal displacement rate of change is greater than 0.3mm/d or accumulative settling amount is big
It is greater than 2mm, Ying Jiami monitoring frequency in 6mm or accumulative horizontal displacement；
It is greater than 10mm when the rate of settling or horizontal displacement-pattern are greater than 0.3mm/d or accumulative settling amount for three days on end, or tired
It counts horizontal displacement and is greater than 3mm, should stop constructing immediately, improve monitoring frequency, and take measures to prevent pier stud from continuing that water occurs
Prosposition moves or sedimentation；
When sedimentation generates, mutation is greater than 5mm/d or horizontal displacement generation mutation is greater than 2mm/d or accumulative settling amount is more than
20mm or accumulative horizontal displacement are more than 5mm, should stop constructing immediately, and are taken measures to mitigate bridge load, for example handed over
Siphunculus system.
(4) girder falling temporary support structure is removed
The temporary support at bent cap bottom is removed, and the larger block concrete that by steel pipe pile driving construction when generates carries out without friction cut
It cuts piecemeal, then demolition reduction will be carried out outside the concrete handling after cutting to bridge, specifically, boring after dicing mixed using core pulling
Hole for hoist is bored on solidifying soil block, then construction site is left in handling.
(5) construction auxiliary cushion cap 2
The foundation pit of construction auxiliary cushion cap 2 is excavated out on the ground above pile foundation 5 first, it is ensured that the side slope and water of foundation pit
The angle of plane is in 45 degree, leaks out 30cm or more until excavating to former 7 upper surface of cushion cap；In digging process, first slightly dug,
Specifically, can slightly be dug using heavy-duty machinery, it is thick to dig to more than design hole bottom absolute altitude 20~30cm, it is dug using essence, tool
Body, it is dug by artificial essence；After excavation, foundation pit surfacing is overhauled；
During excavation pit, when digging to the position for having underground water, sump of constructing out near foundation pit, and
There is gutter of constructing out between the position of underground water and sump, introduces the water into sump；Wherein, the bottom width in gutter is
20cm, the ditch depth in gutter are 20cm, and the sump is arranged one at interval of 20m, and the length and width and height of sump are respectively
30cm, 30cm and 40cm；When gutter and sump cannot be arranged in Local topography, drained using water pumper.
Foundation pit setting-out is carried out, according to auxiliary cushion cap 2 and foundation pit baseplane size, contour line survey in foundation pit baseplane is set to original
On ground；4 edge directions of the foundation pit Planar Contours on ground carry out section survey；It determines the depth for excavating skirt piles, presses
The width that side slope is determined according to lower digging depth, will excavate on center pile layout to ground, and mark is arranged at this, specifically, at this
Place sprinkles lime；Then chisel Stake head handling and draining, after the completion of draining, the assembling reinforcement in foundation pit, before binding, to foundation pit are carried out
It is cleaned, cover to reinforcement uses rubber pad, specifically, the thickness of protective layer is not less than 50mm, and protects by quincuncial arrangement
Sheath；In muti-piece template surface brushing mould oil, and the installation template in foundation pit, sponge strip is used in the joint of adjacent forms
Or double faced adhesive tape blocking, with mortar leakage prevention, and keep template surface smooth, inside line style is straight；Template and bracing reinforcement are firm
Afterwards, template, the dirt on reinforcing bar are cleared up, then is poured concrete, after concrete setting, maintenance and demoulding is carried out, finally backfills base
Hole, the auxiliary construction of cushion cap 2 are completed.Preferably, the length and width and high respectively 12.45m, 0.51m and 1.3m of cushion cap 2, auxiliary are assisted
The strength grade of cushion cap 2 is C40.
To sum up, a kind of auxiliary device for preventing overpass from settling provided by the present invention and its construction method, auxiliary is held
Platform is set in the pile foundation of overpass, and is coated on the outside of the former cushion cap of overpass, and the pier stud of overpass passes through auxiliary cushion cap
And be plugged into former cushion cap, so that pier stud lower end is more firm, it can prevent bridge from settling, in addition, on the ground and position
Support base is set on the outside of pier stud, the joint chair end of support frame is connected on support base, and the beam-ends that connects of support frame is connected to
At the position that bent cap is connect with pier stud, it can effectively prevent bridge from laterally offset occurs, further prevent the uneven of bridge
Sedimentation continues to increase.
In the construction process, it is avoided using temporary support structure, steel pipe T beam support system and set of monitoring method to bridge
Girder construction damages, and is conducive to construction safety.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and replacement can also be made, these are improved and replacement
Also it should be regarded as protection scope of the present invention.
Claims (12)
1. a kind of auxiliary device for preventing overpass from settling, which is characterized in that including auxiliary cushion cap and lateral Displacement supporting element, institute
It states auxiliary cushion cap to be set in the pile foundation of overpass, and is coated on the outside of the former cushion cap of overpass, the pier stud of overpass passes through
The auxiliary cushion cap；The lateral Displacement supporting element includes support base and support frame, and the support base is set on ground and is located at
The joint chair end in the outside of pier stud, support frame as described above is connected on the support base, support frame as described above connect beam-ends be connected to it is overhead
At the position that the bent cap of bridge is connect with pier stud；Support frame as described above includes the first support tube, the second support tube and third support tube, institute
The first support tube and the second support tube is stated to be arranged in angle, first support tube connect beam-ends and the second support tube connect beam-ends
Connection, the joint chair end of first support tube and the joint chair end interval of the second support tube are arranged, and the third support tube is connected to
Between first support tube and the second support tube.
2. the auxiliary device for preventing overpass from settling as described in claim 1, which is characterized in that support frame as described above is relative to water
Plane earth is obliquely installed, and support frame as described above connects beam-ends equipped with the first backing plate, and support frame as described above is connected by first backing plate
At the position being connect to bent cap with pier stud；Support frame as described above, pier stud and ground form triangular structure.
3. the auxiliary device for preventing overpass from settling as described in claim 1, which is characterized in that the support base includes support
Basis and limit base, the brace foundation is set on ground, or is embedded in subsurface, and the limit base is set to the brace foundation
On, the joint chair end of support frame as described above is connected on the limit base.
4. the auxiliary device for preventing overpass from settling as claimed in claim 3, which is characterized in that the limit base includes barricade
And ruggedized construction, the ruggedized construction are set to the outside of the barricade, the inside of institute's barricade is equipped with the second backing plate, support frame as described above
Joint chair end the inside of the barricade is connected to by second backing plate.
5. a kind of construction method for the auxiliary device for preventing overpass from settling as Claims 1-4 is described in any item, feature
It is, includes the following steps:
(1) girder falling temporary support structure is installed
Bridge pier two sides installation temporary support component or Bailey bracket under the girder for being located at overpass are temporarily propped up as girder falling
Support structure, specifically, the bottom end of temporary support component or Bailey bracket to be fixed on to the top of the former cushion cap of overpass, and will be interim
The top of support component or Bailey bracket acts against the bottom end of girder；
(2) lateral Displacement supporting element is installed
Support base is set on the ground being located on the outside of pier stud, the joint chair end of support frame is fixed on support base, and will support
The beam-ends that connects of frame is connected at the position that bent cap is connect with pier stud；
(3) steel pipe T beam support system is installed
First more steel-pipe piles are squeezed into compartment of terrain on the ground between adjacent pier stud, then squeeze on the ground on pier stud periphery again
More steel-pipe piles；
The upper end of these steel-pipe piles is extended close into bent cap bottom, and connector, the connector are set in the upper end of steel-pipe pile
Including direction across bridge I-beam, steel plate and vertical bridge to I-beam, the direction across bridge I-beam is located to the top of the steel-pipe pile, and
Steel plate is set at the top of direction across bridge I-beam, is then connected to the vertical bridge on the steel plate to the lower end of I-beam, and
By vertical bridge to the bent cap bottom end is withstood at the top of I-beam, bridging then is set between adjacent steel-pipe pile；
(4) girder falling temporary support structure is removed
(5) construction auxiliary cushion cap
The foundation pit of construction auxiliary cushion cap is excavated out on the ground above pile foundation first, it is ensured that the side slope of foundation pit and horizontal plane
Angle is in 45 degree, leaks out 30cm or more until excavating to the former cushion cap upper surface of overpass；In digging process, first carry out thick
It digs, it is thick to dig to more than design hole bottom absolute altitude 20~30cm, it is dug using essence；After excavation, foundation pit surfacing is overhauled；
Foundation pit setting-out is carried out, according to auxiliary cushion cap and foundation pit baseplane size, contour line survey in foundation pit baseplane is set to original ground
On；4 edge directions of the foundation pit Planar Contours on ground carry out section survey；The depth for excavating skirt piles is determined, under
The width that depth determines slope is dug, will be excavated on center pile layout to ground, and arrange mark at this；Carry out chisel Stake head handling with
Draining, after the completion of draining, the assembling reinforcement in foundation pit, cover to reinforcement uses rubber pad；It is demoulded in muti-piece template surface brushing
Oil, and the installation template in foundation pit are blocked in the joint of adjacent forms using sponge strip or double faced adhesive tape；
Dirt in cleaning template, reinforcing bar, then it is poured concrete, after concrete setting, maintenance and demoulding are carried out, base is finally backfilled
Hole, auxiliary bearing platform construction are completed.
6. the construction method for the auxiliary device for preventing overpass from settling as claimed in claim 5, which is characterized in that step (2)
The step of middle construction lateral Displacement supporting element includes:
First backing plate is fixed at the position that bent cap is connect with pier stud, and injects gluing between the first backing plate and the position
Agent；
Second backing plate is fixed on the inside of barricade, and injects adhesive between the second backing plate and barricade；
The beam-ends preload that connects of support frame is supported on the first backing plate, and the joint chair end of support frame is pre-tightened and supports to the second backing plate
On, then the beam-ends that connects of support frame is welded on the first backing plate, and the joint chair end of support frame is welded on the second backing plate.
7. the construction method for the auxiliary device for preventing overpass from settling as claimed in claim 5, which is characterized in that step (1)
Middle temporary support component includes temporary support seat, more support columns, crossbeam, Cross stay and bracing element, and the temporary support seat is set
In the top of the former cushion cap of overpass, the bottom end of the more support columns is connected on the temporary support seat, and described in more
The top of support column is in the same plane, and the bottom end of the crossbeam is connected to the top of the more support columns, and the cross
The top of beam acts against the bottom end of girder, and the Cross stay is connected between adjacent support column, and vertical with the support column,
The bracing element is connected between adjacent support column, and with the Cross stay interval.
8. the construction method for the auxiliary device for preventing overpass from settling as claimed in claim 5, which is characterized in that in step
(3) during construction steel tubular pole, with the sedimentation of every 2 hours 1 time frequency monitoring bridge；Make specifically, first choosing a pier stud
For measuring basis, then at left and right sides of measuring basis and 2 monitoring points of each side setting of other each pier studs,
Datum mark is set within the scope of 10~20m of distance construction region, is measured by the technical requirements of second grade leveling；
With the horizontal displacement of every 2 hours 1 time frequency monitoring bridge；Specifically, left at measuring basis and other each pier studs
The right side respectively sets 2 prisms, while embedded 2 have the survey station point of observation pier and forced centering instrument as monitoring criteria point, 2 survey stations
Relative accuracy between point is monitored the horizontal displacement of bridge on survey station point 1/,250,000 or more；
With the fracture width of every 2 hours 1 time frequency monitoring bridge, fractue spacing is depicted at the position for first occurring crack on bridge
And and mark out the characteristic point position in crack, and measure the average crack width in these cracks；Then 5 width maximums are selected
The standard specimen crack that is monitored as construction period of crack, measure length, width and the depth in this 5 standard specimen cracks.
9. the construction method for the auxiliary device for preventing overpass from settling as claimed in claim 8, which is characterized in that according to construction
The monitoring result of process calculates accumulative settling amount, accumulative horizontal displacement, the rate of settling and the horizontal displacement-pattern of bridge；Work as sedimentation
Rate is greater than 0.3mm/d or horizontal displacement-pattern is greater than 0.3mm/d or accumulative settling amount is greater than 6mm or accumulative horizontal displacement
Greater than 2mm, Ying Jiami monitoring frequency；
When the rate of settling or horizontal displacement-pattern are greater than 0.3mm/d or accumulative settling amount greater than 10mm or accumulative water for three days on end
Prosposition, which moves, is greater than 3mm, should stop constructing immediately, improve monitoring frequency, and takes measures to prevent pier stud from continuing that horizontal position occurs
It moves or settles；
When the rate of settling generates, mutation is greater than 5mm/d or horizontal displacement-pattern generates mutation and is greater than 2mm/d or accumulative settling amount
More than 20mm or accumulative horizontal displacement is more than 5mm, should stop constructing immediately, and take measures to mitigate bridge load.
10. the construction method for the auxiliary device for preventing overpass from settling as claimed in claim 5, which is characterized in that step (5)
During excavation pit, when digging to the position for having underground water, sump of constructing out near foundation pit, and having underground water
Position and sump between construct out gutter, introduce the water into sump；Wherein, the bottom width in gutter is 20cm, gutter
Ditch depth be 20cm, the sump is arranged one at interval of 20m, the length and width of the sump and it is high be respectively 30cm, 30cm
And 40cm；When gutter and sump cannot be arranged in Local topography, drained using water pumper.
11. the construction method for the auxiliary device for preventing overpass from settling as claimed in claim 5, which is characterized in that step (5)
The length and width of middle auxiliary cushion cap and high respectively 12.45m, 0.51m and 1.3m, assisting the strength grade of cushion cap is C40.
12. the construction method for the auxiliary device for preventing overpass from settling as claimed in claim 5, which is characterized in that in step
(3) in steel-pipe pile work progress, steel-pipe pile is first squeezed by ground using vibration hammer, when driving depth is to 8-9m, using reaction frame
Steel-pipe pile is continued to be pressed into ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710170403.4A CN106869038B (en) | 2017-03-21 | 2017-03-21 | The auxiliary device and its construction method for preventing overpass from settling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710170403.4A CN106869038B (en) | 2017-03-21 | 2017-03-21 | The auxiliary device and its construction method for preventing overpass from settling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106869038A CN106869038A (en) | 2017-06-20 |
| CN106869038B true CN106869038B (en) | 2019-06-14 |
Family
ID=59172719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710170403.4A Active CN106869038B (en) | 2017-03-21 | 2017-03-21 | The auxiliary device and its construction method for preventing overpass from settling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106869038B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110619177B (en) * | 2019-09-18 | 2023-03-31 | 广州大学 | Automatic identification method and device for structure operation modal parameters and storage medium |
| CN111287069B (en) * | 2020-02-23 | 2021-07-16 | 苏州知瑞光电材料科技有限公司 | Connecting member for overcoming non-uniform settlement of bridge |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858055A (en) * | 2010-06-04 | 2010-10-13 | 中交第一航务工程局有限公司 | Setting steel pipe bracket support system of cover beam and construction method thereof |
| CN103147402A (en) * | 2013-03-27 | 2013-06-12 | 上海建工集团股份有限公司 | Support device for constructing continuous box girder bridge and elevation adjusting method |
| CN103981816A (en) * | 2014-04-15 | 2014-08-13 | 河南省公路工程局集团有限公司 | Construction method for underpinning of overpass framework pier columns |
| CN105155431A (en) * | 2015-10-22 | 2015-12-16 | 河南省公路工程局集团有限公司 | Rapid repair method for three-stand-column structure bridge with damaged lateral stand columns and undamaged beam and slab structure |
| KR20160085086A (en) * | 2015-01-07 | 2016-07-15 | 주식회사 포스코건설 | Settlement adjusting apparatus and settlement adjusting maintenance method for earthwork connecting portion |
-
2017
- 2017-03-21 CN CN201710170403.4A patent/CN106869038B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858055A (en) * | 2010-06-04 | 2010-10-13 | 中交第一航务工程局有限公司 | Setting steel pipe bracket support system of cover beam and construction method thereof |
| CN103147402A (en) * | 2013-03-27 | 2013-06-12 | 上海建工集团股份有限公司 | Support device for constructing continuous box girder bridge and elevation adjusting method |
| CN103981816A (en) * | 2014-04-15 | 2014-08-13 | 河南省公路工程局集团有限公司 | Construction method for underpinning of overpass framework pier columns |
| KR20160085086A (en) * | 2015-01-07 | 2016-07-15 | 주식회사 포스코건설 | Settlement adjusting apparatus and settlement adjusting maintenance method for earthwork connecting portion |
| CN105155431A (en) * | 2015-10-22 | 2015-12-16 | 河南省公路工程局集团有限公司 | Rapid repair method for three-stand-column structure bridge with damaged lateral stand columns and undamaged beam and slab structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106869038A (en) | 2017-06-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Finno et al. | Performance of a stiff support system in soft clay | |
| Finno et al. | Three-dimensional responses of a tied-back excavation through clay | |
| CN106641440B (en) | A kind of transverse crossing railway line underground piping jacking construction method | |
| CN1837506B (en) | Construction method for excavating box-shape structure over an operating tunnel | |
| CN105887947A (en) | Deviation rectification method and device for pile foundation inclination | |
| CN106088127A (en) | Open caisson construction method | |
| CN204491626U (en) | The foundation pit enclosure structure that Larsen steel sheet pile and prestressed anchor combine | |
| CN102430277B (en) | Coarse grid sunk well for physically processing waste water and construction method thereof | |
| CN110485429A (en) | A kind of prestressing force fashioned iron assembled combination inner support construction method | |
| CN105953078B (en) | The protective device of high-pressure gas pipeline and guard method | |
| CN108842819A (en) | A kind of urban track traffic cable run method for tunnel construction | |
| CN112064751A (en) | Deep groove construction method for drainage pipeline | |
| CN107489164A (en) | The heightening and consolidation structure and method of a kind of in-service reinforced concrete retaining wall | |
| CN106869038B (en) | The auxiliary device and its construction method for preventing overpass from settling | |
| Clough et al. | A study of earth loadings on floodway retaining structures in the 1971 San Fernando Valley earthquake | |
| CN106988305A (en) | A kind of pile-column pier construction method of underground integrated molding | |
| Glass et al. | Application of the observational method at the Limehouse Link | |
| CN108625368A (en) | A kind of Deep Thick Soft Ground Area Rigid Long-Short-Pile Composite Foundation construction method | |
| CN110042842A (en) | A kind of open cut construction method of deep foundation ditch for wearing river | |
| CN205742125U (en) | A kind of work platform for boring | |
| CN115110419A (en) | Combined construction method for multi-terrain cast-in-place bridge steel trestle, platform and cofferdam | |
| Evans et al. | Modified sheet pile abutments for low-volume road bridges | |
| KR20210078779A (en) | Underground roadway removed upper structure between upper slab and surface of road after constructing the steel continuous wall in the earth by top-down method and method for constructing the same | |
| KR20210055980A (en) | Underground roadway by top-down method using steel continuous wall in the earth without traffic control and temporary road and method for constructing the same | |
| Stallings | Implementation of Geosynthetic Reinforced Soil-Integrated Bridge System (GRS-IBS) Technology in Alabama |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |