CN106869038A - Prevent servicing unit and its construction method that overpass is settled - Google Patents
Prevent servicing unit and its construction method that overpass is settled Download PDFInfo
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- CN106869038A CN106869038A CN201710170403.4A CN201710170403A CN106869038A CN 106869038 A CN106869038 A CN 106869038A CN 201710170403 A CN201710170403 A CN 201710170403A CN 106869038 A CN106869038 A CN 106869038A
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- support
- overpass
- bridge
- cushion cap
- steel
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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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling 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
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The present invention relates to Urban Bridge field, disclose a kind of servicing unit for preventing overpass from settling and its construction method, the device has the function of preventing overpass from settling, it includes aiding in cushion cap and lateral Displacement support member, the auxiliary cushion cap is in the pile foundation of overpass, and the outside of the former cushion cap of overpass is coated on, the pier stud of overpass passes through the auxiliary cushion cap；The lateral Displacement support member includes support base and support frame, the support base is on ground and positioned at the outside of pier stud, the joint chair end of support frame as described above is connected on the support base, and the beam-ends that connects of support frame as described above is connected at the position that the bent cap of overpass is connected with pier stud.Be coated on auxiliary cushion cap outside former cushion cap by the present invention so that pier stud lower end more consolidates, and is prevented from bridge and settles, and can effectively prevent bridge from laterally offset occurring using lateral Displacement support member, further prevents the differential settlement of bridge from continuing to increase.
Description
Technical field
The present invention relates to Urban Bridge field, more particularly to a kind of servicing unit for preventing overpass from settling and its construction
Method.
Background technology
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, so as to cause the differential settlement of bridge foundation.And, when urban viaduct
When basis differential settlement occurs and needs to carry out maintenance and reinforcement, because newly-built pile foundation is nearer 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 pile driving construction is bored, just in case collapse
The accidents such as hole, will produce the influence for being difficult to estimate to original structure.
The content of the invention
It is an object of the invention to provide a kind of servicing unit for preventing overpass from settling and its construction method, to solve city
There is the problem of foundation uneven settlement in overpass.
In order to solve the above-mentioned technical problem, the present invention provides a kind of servicing unit for preventing overpass from settling, and it includes auxiliary
Help cushion cap and lateral Displacement support member, the auxiliary cushion cap to be located in the pile foundation of overpass, and be coated on the original of overpass and hold
The outside of platform, the pier stud of overpass passes through the auxiliary cushion cap；The lateral Displacement support member includes support base and support frame, institute
Support base is stated on ground and positioned at the outside of pier stud, the joint chair end of support frame as described above is connected on the support base, described
The beam-ends that connects of support frame is connected at the position that the bent cap of overpass is connected with pier stud.
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 provided with
First backing plate, support frame as described above is connected at the position that bent cap is connected with pier stud by first backing plate；Support frame as described above, pier
Post and ground form triangular structure.
Preferably, support frame as described above includes the first support tube, the second support tube and the 3rd support tube, described first
Support tube and the second support tube are set in angle, and the beam-ends that connects of first support tube is connected 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 setting of the second support tube, the 3rd support tube are 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 located on ground, or
Subsurface is embedded in, on the brace foundation, the joint chair end of support frame as described above is connected to the limit base to the limit base
On.
Preferably, the limit base includes barricade and ruggedized construction, and the ruggedized construction is located at the barricade
Outside, is provided with the second backing plate on the inside of institute's barricade, the joint chair end of support frame as described above is connected to the gear by second backing plate
The inner side of wall.
A kind of construction method of the servicing unit for preventing overpass from settling, comprises the following steps：
(1) girder falling temporary support structure is installed
Temporary support component is installed in the bridge pier both sides under the girder of overpass or Bailey bracket is faced as girder falling
When supporting construction, specifically, the bottom of temporary support component or Bailey bracket to be fixed on the top of the former cushion cap of overpass, and will
The top of temporary support component or Bailey bracket acts against the bottom of girder.
(2) lateral limited support part is installed
In support base of being constructed 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 connected with pier stud.
(3) steel pipe T beam support systems are installed
First many 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 many 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 that direction across bridge I-beam, steel plate and vertical bridge, to I-beam, the direction across bridge I-beam are located at 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 vertical bridge is set into bridging to the bent cap bottom is withstood at the top of I-beam between adjacent steel-pipe pile；
(4) girder falling temporary support structure is removed
(5) construction auxiliary cushion cap
The foundation ditch that construction aids in cushion cap is excavated out on ground first above pile foundation, it is ensured that the side slope and level of foundation ditch
The angle in face is in 45 degree, until excavation spills more than 30cm to the former cushion cap upper surface of overpass；In digging process, first carry out
Thick to dig, thick digging after 20~30cm, is dug to more than the bottom absolute altitude of design hole using essence；After excavation is finished, foundation ditch surfacing is overhauled；
Foundation ditch setting-out is carried out, according to auxiliary cushion cap and foundation ditch baseplane size, foundation ditch baseplane contour line is surveyed and is set to original
On ground；Section survey is carried out along 4 edge directions of the foundation ditch Planar Contours on ground；It is determined that excavating the depth of skirt piles, press
The width of slope is determined according to lower digging depth, center pile layout will be excavated to ground, and arrangement mark in this place；Carry out at chisel pile crown
Reason and draining, after the completion of draining, the assembling reinforcement in foundation ditch, cover to reinforcement uses rubber blanket；In polylith template surface brushing
Mould oil, and the installation form in foundation ditch, are blocked in the joint of adjacent forms using sponge strip or two-sided tape；
Dirt on cleaning template, reinforcing bar, then concrete is poured into a mould, after concrete setting, conserved and form removal, finally return
Foundation ditch is filled out, auxiliary bearing platform construction is completed.
Preferably, include the step of construction lateral Displacement support member in step (2)：
First backing plate is fixed at the position that bent cap is connected with pier stud, and is injected between the first backing plate and the position
Adhesive；
Second backing plate is fixed on the inner side of barricade, and adhesive is injected between the second backing plate and barricade；
The beam-ends pretension that connects of support frame is supported on the first backing plate, and the joint chair end pretension of support frame is supported 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, many support columns, crossbeam, stulls in step (1)
Part and bracing element, located at the top of the former cushion cap of overpass, the bottom of many support columns is connected to the temporary support seat
On temporary support seat, and the top of many support columns is in the same plane, and the bottom of the crossbeam is connected to many
The top of support column described in root, and the top of the crossbeam acts against the bottom of girder, the Cross stay is connected to adjacent branch
Between dagger and 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 pile tube, with the heavy of the frequency monitoring bridge of every 2 hours 1 time
Drop；Specifically, first choose a pier stud as measuring basis, then in the measuring basis left and right sides and other each pier studs
2 monitoring points are each side set, datum mark are set in the range of 10~20m of distance construction region, by the skill of second grade leveling
Art requirement is measured；
With the horizontal displacement of the frequency monitoring bridge of every 2 hours 1 time；Specifically, in measuring basis and other each pier studs
Place left and right respectively sets 2 prisms, while embedded 2 have the survey station point of observation pier and forced centering instrument as monitoring criteria point, 2
More than 1/,250,000, the horizontal displacement to bridge on survey station point is monitored relative accuracy between survey station point；
With the fracture width of the frequency monitoring bridge of every 2 hours 1 time, first occur depicting crack at the position in 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
The standard specimen crack that maximum crack is monitored as construction period, measures this 5 length in standard specimen crack, width and depth.
Preferably, the monitoring result according to work progress calculate the accumulative settling amount of bridge, accumulative horizontal displacement,
The rate of settling and horizontal displacement-pattern；When the rate of settling is more than 0.3mm/d, or horizontal displacement rate of change is more than 0.3mm/d, or
Accumulative settling amount is more than 6mm, or accumulative horizontal displacement is more than 2mm, should encrypt monitoring frequency；
When the rate of settling or horizontal displacement-pattern are more than 0.3mm/d for three days on end, or accumulative settling amount is more than 10mm, or tired
Meter horizontal displacement is more than 3mm, should immediately stop construction, improves monitoring frequency, and take measures to prevent pier stud from continuing water
Prosposition is moved or settled；
When sedimentation produces mutation to be more than 5mm/d, or horizontal displacement produces mutation to be more than 2mm/d, or accumulative settling amount exceedes
20mm, or accumulative horizontal displacement is more than 5mm, should immediately stop construction, and take measures to mitigate bridge load.
Preferably, during step (5) excavation pit, when digging to the position for having underground water, in foundation ditch
Vicinity construct out sump, and having gutter of being constructed out between the position of underground water and sump, introduce the water into sump；
Wherein, the bottom width in gutter is 20cm, and the ditch depth in gutter is 20cm, and the sump sets one, the collection at interval of 20m
The length and width of well and respectively 30cm, 30cm and 40cm high；When Local topography can not set gutter and sump, use
Water pumper carries out draining.
Preferably, the length and width of auxiliary cushion cap and respectively 12.45m, 0.51m and 1.3m high 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 into by ground using vibration hammer, when
When driving depth is to 8-9m, steel-pipe pile is continued using reaction frame be pressed into ground.
A kind of servicing unit for preventing overpass from settling provided by the present invention and its construction method, auxiliary cushion cap is located at
In the pile foundation of overpass, and the outside of the former cushion cap of overpass is coated on, the pier stud of overpass is through auxiliary cushion cap and grafting
To in former cushion cap so that the lower end of pier stud more consolidates, and is prevented from bridge and settles, additionally, on the ground and positioned at pier
Support base is set on the outside of post, 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 connected with pier stud, can effectively prevent bridge from laterally offset occurring, further prevent the differential settlement of bridge
Continue to increase.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the servicing unit for preventing overpass from settling of the embodiment of the present invention；
Fig. 2 is the structural representation of the support frame of the embodiment of the present invention；
Fig. 3 is a kind of flow chart of the construction method of the servicing unit for preventing overpass from settling in the embodiment of the present invention；
Fig. 4 is the structural representation of steel pipe T beam support systems in the embodiment of the present invention.
Wherein, 1, bent cap；2nd, cushion cap is aided in；3rd, pier stud；4th, lateral Displacement support member, 41, support base；411st, branch support group
Plinth；412nd, limit base；4121st, barricade；4122nd, ruggedized construction；42nd, support frame；421st, the first support tube；422nd, the second support
Pipe；423rd, the 3rd support tube；5th, pile foundation；6th, steel-pipe pile component；61st, steel-pipe pile；62nd, connector；63rd, bridging；7th, original is held
Platform.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the invention is described in further detail.Hereinafter implement
Example is not limited to the scope of the present invention for illustrating the present invention.
As shown in figure 1, a kind of servicing unit for preventing overpass from settling of the preferred embodiment of the present invention, it includes that auxiliary is held
Platform 2 and lateral Displacement support member 4, auxiliary cushion cap 2 are located 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 more consolidates, can
Prevent bridge from settling；Lateral Displacement support member 4 includes support base 41 and support frame 42, and support base 41 is located 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 connected with pier stud 3, in use, lateral Displacement support member 4 can effectively prevent bridge from side occurring
To skew, the differential settlement of bridge is further prevented to continue to increase.
In order that support frame 42 can effectively prevent bridge laterally offset, support frame 42 is inclined relative to level ground and set
Put, and support frame 42, pier stud 3 and ground form triangular structure, to cause that supporting construction is more consolidated, it is preferred that in support
The beam-ends that connects of frame 42 is provided with the first backing plate, and support frame 42 is connected at the position that bent cap 1 is connected with pier stud 3 by the first backing plate.
As shown in Fig. 2 support frame 42 includes the first support tube 421, the second support tube 422 and the 3rd support tube 423, first
The support tube 422 of support tube 421 and second is set in angle, the first support tube 421 connect beam-ends and the second support tube 422 connect beam
The joint chair end interval setting of end connection, the joint chair end of the first support tube 421 and the second support tube 422, the 3rd support tube 423 is connected
Between the first support tube 421 and the second support tube 422, the first support tube 421, the second support tube 422 and the 3rd support tube 423
Composition " A " character form structure so that support frame 42 itself is more consolidated, improves the ability of resistance bridge laterally offset.Preferably,
The material that first support tube, the second support tube and the 3rd support tube are used for steel pipe, specifically, be the seamless steel pipes of Φ 325 × 12.
Further, it is also possible to set other support tubes 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 strengthen the steadiness of lateral Displacement support member 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
For support limit seat 412, brace foundation 411 can be on ground, it is also possible to is embedded in subsurface, limit base 412 is located at
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 located at the outside of barricade 4121, to improve the resistance lateral force of barricade 4121
Ability, the inner side of barricade 4121 is provided with the second backing plate, and the joint chair end of support frame 42 is connected to barricade 4121 by the second backing plate
Inner side.
As shown in figure 3, preventing the construction method of the servicing unit of overpass sedimentation from comprising the following steps：
(1) girder falling temporary support structure is installed
Temporary support component is installed in the bridge pier both sides under the girder of overpass or Bailey bracket is faced as girder falling
When supporting construction, specifically, the bottom of temporary support component or Bailey bracket to be fixed on the top of the former cushion cap 7 of overpass, and
The top of temporary support component or Bailey bracket is acted against the bottom of girder.
Temporary support component includes temporary support seat, many support columns, crossbeam, Cross stay and bracing elements, temporary support seat
Located at the top of the former cushion cap 7 of overpass, the bottom of many support columns is connected on temporary support seat, and many tops of support column
End is in the same plane, and the bottom of crossbeam is connected to many tops of support column, and the top of crossbeam acts against the bottom of girder
End, Cross stay is connected between adjacent support column, and vertical with support column, and bracing element is connected between adjacent support column, and
It is spaced with Cross stay, to improve the stability of supporting construction.In order that temporary support component has enough strength supports, support column
Using the steel pipes of φ 480 × 10, crossbeam uses I-shaped gooseneck, specially I25B models I-steel, and size is φ 219 × 10, is faced
When support base formed using 10mm and 18mm steel plate combinations, model I36B, Cross stay and bracing element are using [16 channel-section steels, and horizontal
Support member uses welding to be connected on support column with bracing element.
(2) lateral limited support part 4 is installed
In support base 41 of being constructed out on the ground on the outside of pier stud 3, 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 connected with pier stud 3.
Specifically, the step of construction lateral Displacement support member 4 include：
First backing plate is fixed at the position that bent cap 1 is connected with pier stud 3, and is noted between the first backing plate and 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 arranged on the first steel plate
At the position that bent cap 1 is connected with pier stud 3, steel bonding glue is injected between concrete then at the position and the first steel plate；
Second backing plate is fixed on the inner side of barricade, and adhesive is injected between the second backing plate and barricade, it is preferred that
Using the second steel plate as the second backing plate, first pass through the second high-strength bolt and the second steel plate be installed on the inner side of barricade 4121,
And steel bonding glue is injected between the concrete of the second steel plate and barricade 4121；
The beam-ends pretension that connects of support frame 42 is supported on the first backing plate, and the joint chair end pretension of support frame 42 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 systems are installed
As shown in figure 4, install steel pipe T beam support systems comprising the following steps：
First many 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
Root, the bottom of bent cap 1 is extended close to by the upper end of steel-pipe pile 61, and sets connector 62 in the upper end of steel-pipe pile 61, 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
The top of steel-pipe pile 61 is located at, and steel plate is set at the top of direction across bridge I-beam, then connect vertical bridge to the lower end of I-beam
It is connected on steel plate, and by vertical bridge to the bottom that bent cap 1 is withstood at the top of I-beam；Then set between adjacent steel-pipe pile 61
Skewed horizontal load part, it is preferred that be located between adjacent steel-pipe pile 61 using bridging 63.
Many steel are squeezed on the ground of side then again on the ground on the periphery of pier stud 3 or opposite with other pier studs 3
Pile tube, likewise, the upper end of these steel-pipe piles to be extended close to the bottom of bent cap 1, is then located at steel by direction across bridge I-beam
The top of pile tube 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 that bent cap 1 is withstood 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 not enough in order to avoid being limited by bridge base space, first use and shake
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, and reaction frame is needed
Carry out forcing checking, it is ensured that anti-overturning energy of the internal force, bearing anchor force and concrete foundation of reversed beam etc. meets specification will
Ask.
Because in work progress, gene vibrations in ground are likely to result in bridge foundation local subsidence or skew, therefore in construction
During steel-pipe pile, with the sedimentation of the frequency monitoring bridge of every 2 hours 1 time；Specifically, first choosing a pier stud as measurement base
Standard, then in 2 monitoring points of each side setting of the measuring basis left and right sides and other each pier studs, in distance construction
Datum mark is set in the range of 10~20m of region, is measured by the technical requirements of second grade leveling, specifically, using LeicaN3 essences
Quasi- spirit level and indium watt chi are measured；
With the horizontal displacement of the frequency monitoring bridge of every 2 hours 1 time；Specifically, in measuring basis and other each pier studs
Place left and right respectively sets 2 prisms, while embedded 2 have the survey station point of observation pier and forced centering instrument as monitoring criteria point, 2
More than 1/,250,000, the horizontal displacement to bridge on survey station point is monitored relative accuracy between survey station point, specifically, surveying
Measured using total powerstation and its supporting prism on website；
With the fracture width of the frequency monitoring bridge of every 2 hours 1 time, first occur depicting crack at the position in 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
The standard specimen crack that maximum crack is monitored as construction period, measures this 5 length in standard specimen crack, width and depth, has
Body, width is measured using Si Weier crack observers or scale microscope, it is true to be aided with core pulling detection using ultrasonic wave detector
Depthkeeping degree.
Monitoring result according to work progress calculates the accumulative settling amount of bridge, accumulative horizontal displacement, the rate of settling and water
Flat rate of displacement；When the rate of settling is big more than 0.3mm/d, or accumulative settling amount more than 0.3mm/d, or horizontal displacement rate of change
It is more than 2mm in 6mm, or accumulative horizontal displacement, monitoring frequency should be encrypted；
When the rate of settling or horizontal displacement-pattern are more than 0.3mm/d for three days on end, or accumulative settling amount is more than 10mm, or tired
Meter horizontal displacement is more than 3mm, should immediately stop construction, improves monitoring frequency, and take measures to prevent pier stud from continuing water
Prosposition is moved or settled；
When sedimentation produces mutation to be more than 5mm/d, or horizontal displacement produces mutation to be more than 2mm/d, or accumulative settling amount exceedes
20mm, or accumulative horizontal displacement is more than 5mm, should immediately stop construction, and take measures to mitigate bridge load, such as to be 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 produced during by steel pipe pile driving construction carries out without friction cutting
Cut piecemeal, then demolition reduction will be carried out outside the concrete handling after cutting to bridge, specifically, using core pulling bore after dicing it is mixed
Hole for hoist is bored on solidifying soil block, job site is left in then handling.
(5) construction auxiliary cushion cap 2
The foundation ditch that construction aids in cushion cap 2 is excavated out on the ground of the top of pile foundation 5 first, it is ensured that the side slope and water of foundation ditch
The angle of plane is in 45 degree, until excavate to the former upper surface of cushion cap 7 spilling more than 30cm；In digging process, first slightly dug,
Specifically, can slightly be dug using heavy-duty machinery, thick digging after 20~30cm, is dug, tool to more than the bottom absolute altitude of design hole using essence
Body, dug by artificial essence；After excavation is finished, foundation ditch surfacing is overhauled；
During excavation pit, when digging to the position for having underground water, constructed out sump in the vicinity of foundation ditch, and
There is gutter of being constructed out between the position of underground water and sump, introduce the water into sump；Wherein, the bottom width in gutter is
20cm, the ditch depth in gutter is 20cm, and the sump sets one at interval of 20m, and the length and width and height of sump are respectively
30cm, 30cm and 40cm；When Local topography can not set gutter and sump, draining is carried out using water pumper.
Foundation ditch setting-out is carried out, according to auxiliary cushion cap 2 and foundation ditch baseplane size, foundation ditch baseplane contour line is surveyed and is set to original
On ground；Section survey is carried out along 4 edge directions of the foundation ditch Planar Contours on ground；It is determined that excavating the depth of skirt piles, press
The width of side slope is determined according to lower digging depth, center pile layout will be excavated to ground, and arrangement mark in this place, specifically, at this
Place sprinkles lime；Then carry out digging Stake head handling and draining, after the completion of draining, the assembling reinforcement in foundation ditch, before colligation, to foundation ditch
Cleaned, cover to reinforcement uses rubber blanket, specifically, the thickness of protective layer is not less than 50mm, and protected by quincuncial arrangement
Sheath；In polylith template surface brushing mould oil, and the installation form in foundation ditch, sponge strip is used in the joint of adjacent forms
Or two-sided tape is blocked, with mortar leakage prevention, and holding template surface is smooth, and inner side line style is straight；Template and bracing reinforcement are firm
Afterwards, the dirt on cleaning template, reinforcing bar, then concrete is poured into a mould, after concrete setting, conserved and form removal, finally backfill base
Hole, the auxiliary construction of cushion cap 2 is completed.Preferably, the length and width of auxiliary cushion cap 2 and respectively 12.45m, 0.51m and 1.3m high, auxiliary
The strength grade of cushion cap 2 is C40.
To sum up, a kind of servicing unit for preventing overpass from settling provided by the present invention and its construction method, auxiliary is held
Platform is located 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 more consolidates, and is prevented from bridge and settles, additionally, 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 connected with pier stud, can effectively prevent bridge from laterally offset occurring, further prevent the uneven of bridge
Sedimentation continues to increase.
In work progress, avoided to bridge using temporary support structure, steel pipe T beams support system and set of monitoring method
Girder construction causes to damage, and is conducive to construction safety.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, on the premise of the technology of the present invention principle is not departed from, some improvement and replacement can also be made, these improve and replace
Also should be regarded as protection scope of the present invention.
Claims (13)
1. it is a kind of prevent overpass settle servicing unit, it is characterised in that including auxiliary cushion cap and lateral Displacement support member, institute
Auxiliary cushion cap is stated in the pile foundation of overpass, and is coated on the outside of the former cushion cap of overpass, the pier stud of overpass is passed through
The auxiliary cushion cap；The lateral Displacement support member includes support base and support frame, and the support base is 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, support frame as described above connect beam-ends be connected to it is overhead
At the position that the bent cap of bridge is connected with pier stud.
2. the servicing unit for preventing overpass from settling as claimed in claim 1, it is characterised in that support frame as described above is relative to water
Plane earth is obliquely installed, and the beam-ends that connects of support frame as described above is provided with the first backing plate, and support frame as described above is connected by first backing plate
At the position being connected with pier stud to bent cap；Support frame as described above, pier stud and ground form triangular structure.
3. the servicing unit for preventing overpass from settling as claimed in claim 1, it is characterised in that support frame as described above includes first
Support tube, the second support tube and the 3rd support tube, first support tube and the second support tube are set in angle, described first
The beam-ends that connects of stay tube is connected with the beam-ends that connects of the second support tube, the joint chair end of first support tube and the joint chair of the second support tube
End interval setting, the 3rd support tube is connected between first support tube and the second support tube.
4. the servicing unit for preventing overpass from settling as claimed in claim 1, it is characterised in that the support base includes support
Basis and limit base, the brace foundation is on ground, or is embedded in subsurface, and the limit base is located at the brace foundation
On, the joint chair end of support frame as described above is connected on the limit base.
5. the servicing unit for preventing overpass from settling as claimed in claim 4, it is characterised in that the limit base includes barricade
And ruggedized construction, the ruggedized construction located at the barricade outside, be provided with the second backing plate, support frame as described above on the inside of institute's barricade
Joint chair end the inner side of the barricade is connected to by second backing plate.
6. it is a kind of as described in any one of claim 1 to 5 prevent overpass settle servicing unit construction method, its feature
It is to comprise the following steps：
(1) girder falling temporary support structure is installed
Temporary support component is installed in the bridge pier both sides under the girder of overpass or Bailey bracket is propped up temporarily as girder falling
Support structure, specifically, the bottom of temporary support component or Bailey bracket is fixed on 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 of girder.
(2) lateral limited support part is installed
Support base is being set on the ground on the outside of pier stud, the joint chair end of support frame is being fixed on support base, and will support
The beam-ends that connects of frame is connected at the position that bent cap is connected with pier stud.
(3) steel pipe T beam support systems are installed
First many steel-pipe piles are squeezed into compartment of terrain on the ground between adjacent pier stud, are then squeezed on the ground on pier stud periphery again
Many 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 at the top of the steel-pipe pile, and
Steel plate is set at the top of direction across bridge I-beam, then the vertical bridge is connected on the steel plate to the lower end of I-beam, and
By vertical bridge to the bent cap bottom 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 ditch that construction aids in cushion cap is excavated out on ground first above pile foundation, it is ensured that the side slope of foundation ditch and horizontal plane
Angle is in 45 degree, until excavation spills more than 30cm to the former cushion cap upper surface of overpass；In digging process, first carry out thick
Dig, thick digging after 20~30cm, is dug to more than the bottom absolute altitude of design hole using essence；After excavation is finished, foundation ditch surfacing is overhauled；
Foundation ditch setting-out is carried out, according to auxiliary cushion cap and foundation ditch baseplane size, foundation ditch baseplane contour line is surveyed and is set to original ground
On；Section survey is carried out along 4 edge directions of the foundation ditch Planar Contours on ground；It is determined that the depth of skirt piles is excavated, under
The width that depth determines slope is dug, center pile layout will be excavated to ground, and arrangement mark in this place；Carry out chisel Stake head handling with
Draining, after the completion of draining, the assembling reinforcement in foundation ditch, cover to reinforcement uses rubber blanket；In the polylith template surface brushing demoulding
Oil, and the installation form in foundation ditch, are blocked in the joint of adjacent forms using sponge strip or two-sided tape；
Dirt on cleaning template, reinforcing bar, then concrete is poured into a mould, after concrete setting, conserved and form removal, finally backfill base
Hole, auxiliary bearing platform construction is completed.
7. the construction method of the servicing unit of overpass sedimentation is prevented as claimed in claim 6, it is characterised in that step (2)
The step of middle construction lateral Displacement support member, includes：
First backing plate is fixed at the position that bent cap is connected with pier stud, and gluing is injected between the first backing plate and the position
Agent；
Second backing plate is fixed on the inner side of barricade, and adhesive is injected between the second backing plate and barricade；
The beam-ends pretension that connects of support frame is supported on the first backing plate, and the joint chair end pretension of support frame is supported into 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.
8. the construction method of the servicing unit of overpass sedimentation is prevented as claimed in claim 6, it is characterised in that step (1)
Middle temporary support component includes temporary support seat, many support columns, crossbeam, Cross stay and bracing elements, and the temporary support seat sets
In the top of the former cushion cap of overpass, the bottom of many support columns is connected on the temporary support seat, and described in many
The top of support column is in the same plane, and the bottom of the crossbeam is connected to many tops of the support column, and the horizontal stroke
The top of beam acts against the bottom 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 is spaced with the Cross stay.
9. the construction method of the servicing unit of overpass sedimentation is prevented as claimed in claim 6, it is characterised in that in step
(3) during construction steel pile tube, with the sedimentation of the frequency monitoring bridge of every 2 hours 1 time；Specifically, first choose a pier stud making
It is measuring basis, then in 2 monitoring points of each side setting of the measuring basis left and right sides and other each pier studs,
Datum mark is set in the range of 10~20m of distance construction region, is measured by the technical requirements of second grade leveling；
With the horizontal displacement of the frequency monitoring bridge of every 2 hours 1 time；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
More than 1/,250,000, the horizontal displacement to bridge on survey station point is monitored relative accuracy between point；
With the fracture width of the frequency monitoring bridge of every 2 hours 1 time, first occur depicting fractue spacing at the position in 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 monitored as construction period of crack, measure this 5 length in standard specimen crack, width and depth.
10. the construction method of the as claimed in claim 9 servicing unit for preventing overpass from settling, it is characterised in that according to applying
The monitoring result of work process calculates the accumulative settling amount of bridge, accumulative horizontal displacement, the rate of settling and horizontal displacement-pattern；When heavy
Reduction of speed rate is more than 0.3mm/d, or horizontal displacement rate of change is more than 0.3mm/d, or accumulative settling amount is more than 6mm, or accumulative water
Prosposition is moved and is more than 2mm, should encrypt monitoring frequency；
When the rate of settling or horizontal displacement-pattern are more than 0.3mm/d for three days on end, or accumulative settling amount is more than 10mm, or accumulative water
Prosposition is moved and is more than 3mm, should immediately stop construction, improves monitoring frequency, and take measures to prevent pier stud from continuing occurred level position
Move or settle；
When sedimentation produces mutation to be more than 5mm/d, or horizontal displacement produces mutation to be more than 2mm/d, or accumulative settling amount is more than 20mm,
Or accumulative horizontal displacement is more than 5mm, should immediately stop construction, and take measures to mitigate bridge load.
The construction method of 11. servicing units for preventing overpass from settling as claimed in claim 6, it is characterised in that step (5)
During excavation pit, when digging to the position for having underground water, constructed out sump in the vicinity of foundation ditch, 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 sets one at interval of 20m, the length and width of the sump and high is respectively 30cm, 30cm
And 40cm；When Local topography can not set gutter and sump, draining is carried out using water pumper.
The construction method of 12. servicing units for preventing overpass from settling as claimed in claim 6, it is characterised in that step (5)
The length and width of middle auxiliary cushion cap and respectively 12.45m, 0.51m and 1.3m high, the strength grade of the second cushion cap is C40.
The construction method of 13. servicing units for preventing overpass from settling as claimed in claim 6, it is characterised in that in step
(3) in steel-pipe pile work progress, steel-pipe pile is first squeezed into 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.
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| CN201710170403.4A CN106869038B (en) | 2017-03-21 | 2017-03-21 | The auxiliary device and its construction method for preventing overpass from settling |
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| CN201710170403.4A CN106869038B (en) | 2017-03-21 | 2017-03-21 | The auxiliary device and its construction method for preventing overpass from settling |
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| CN110619177A (en) * | 2019-09-18 | 2019-12-27 | 广州大学 | Automatic identification method and device for structure operation modal parameters and storage medium |
| CN111287069A (en) * | 2020-02-23 | 2020-06-16 | 郑州市公路工程公司 | Connecting member for overcoming non-uniform settlement of bridge |
| CN114737626A (en) * | 2022-04-15 | 2022-07-12 | 中铁十六局集团路桥工程有限公司 | Foundation reinforcement construction method during bridge operation |
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| CN114737626A (en) * | 2022-04-15 | 2022-07-12 | 中铁十六局集团路桥工程有限公司 | Foundation reinforcement construction method during bridge operation |
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| CN106869038B (en) | 2019-06-14 |
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