CN106988231A - The T-shaped firm structure line style monitoring point mounting structure of cantilever and its line type control monitoring method - Google Patents
The T-shaped firm structure line style monitoring point mounting structure of cantilever and its line type control monitoring method Download PDFInfo
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- CN106988231A CN106988231A CN201710320516.8A CN201710320516A CN106988231A CN 106988231 A CN106988231 A CN 106988231A CN 201710320516 A CN201710320516 A CN 201710320516A CN 106988231 A CN106988231 A CN 106988231A
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- absolute altitude
- hanging basket
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000010276 construction Methods 0.000 claims abstract description 85
- 239000004567 concrete Substances 0.000 claims description 29
- 238000005259 measurement Methods 0.000 claims description 21
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 7
- 230000002787 reinforcement Effects 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 5
- 210000003205 muscle Anatomy 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 abstract description 19
- 238000013461 design Methods 0.000 description 11
- 239000011513 prestressed concrete Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000009740 moulding (composite fabrication) Methods 0.000 description 3
- 210000002435 tendon Anatomy 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000009416 shuttering Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/10—Cantilevered erection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
Abstract
The invention provides a kind of T-shaped firm structure line style monitoring point mounting structure of cantilever and its line type control monitoring method.The T-shaped firm structure line style monitoring point mounting structure of the cantilever includes：First measuring point, the second measuring point and the 3rd measuring point, in pre-buried first lengths of rebar in top of the beam block of the T-shaped firm structure of cantilever, the upper end of first lengths of rebar protrudes from the top at the top, and first measuring point is arranged on the top of first lengths of rebar；Second measuring point is set directly in the front-end template of the Hanging Basket bed die of the beam block；The second lengths of rebar is provided with the position corresponding with the front end of the Hanging Basket bed die of the bottom of the beam block, the 3rd measuring point is arranged on the top of second lengths of rebar.The invention can ensure that into bridge line style, reducing construction risk, construction speed, and operation very simple are improved, the level of construction technology is not interfered with, can be effectively by line type control control errors in predetermined scope.
Description
Technical field
The present invention relates to building field, more particularly to a kind of T-shaped firm structure line style monitoring point mounting structure of cantilever and its line style
Control monitoring method.
Background technology
With the development of high-speed railway, bridge construction is the key link of bridge construction, with China's transportation business
Develop rapidly, long-span rigid frame bridge is widely used.Long-span rigid frame bridge, Ji Gaodun, Long span in
All over the body, pier girder construction stress and its complexity, therefore be large span the problems such as stability, line type control, quality control and construction method
The emphasis of rigid frame bridge type.
Cantilever-construction is to build that this kind of bridge is the most economical, efficient construction method.Due to existing very in work progress
Many uncertain factors, to reach design requirement by line type control and monitoring technology, construction line style state is carried out Real time identification,
Adjustment, prediction, are in construction system Guaranteed, this smoothly realizes it is vital to design object line style.
However, prior art is when the line style to T-shaped firm structure is monitored, the problem of being set due to its measuring point, it is difficult to protect
Bridge line style is demonstrate,proved into, construction risk is larger, construction speed is slow, and complex operation, influence is known clearly the level of construction technology, causes line style
Control error excessive.
The content of the invention
It is an object of the invention to provide a kind of T-shaped firm structure line style monitoring point mounting structure of cantilever and its line type control monitoring side
Method, with solve set in the prior art due to its measuring point the problem of, it is difficult to ensure into bridge line style, construction risk is larger, construct into
Degree is slow, and complex operation, and influence is known clearly the level of construction technology, causes the problem of line type control error is excessive.
In order to solve the above technical problems, the invention provides a kind of T-shaped firm structure line style monitoring point mounting structure of cantilever, bag
Include：First measuring point, the second measuring point and the 3rd measuring point, in pre-buried first lengths of rebar in top of the beam block of the T-shaped firm structure of cantilever, described
The upper end of one lengths of rebar protrudes from the top at the top, and first measuring point is arranged on the top of first lengths of rebar；Institute
The second measuring point is stated to be set directly in the front-end template of the Hanging Basket bed die of the beam block；The bottom of the beam block with the Hanging Basket
The second lengths of rebar is provided with the corresponding position in front end of bed die, the 3rd measuring point is arranged on the top of second lengths of rebar
End.
Preferably, the distance between front end face of first lengths of rebar and the beam block is 10 centimetres.
Preferably, the length of appearing of first lengths of rebar and/or second lengths of rebar is 2-3 centimetre.
Preferably, the number of first measuring point is three, and/or the number of second measuring point is two.
Present invention also offers a kind of T-shaped firm structure line type control monitoring method of cantilever, including：Control in each implementation cycle
Flow processed is as follows：Hanging Basket absolute altitude after Hanging Basket, and first measurement and positioning is positioned according to predetermined Hanging Basket positioning absolute altitude；According to above-mentioned
Cantilever T-shaped firm structure line style monitoring point mounting structure measuring point is set；Before casting concrete, all constructed in beam section is measured
Elevation measuring point, repetition measurement Hanging Basket absolute altitude, the horizontal displacement of pier top；Hanging Basket absolute altitude and the Hanging Basket absolute altitude of repetition measurement according to measuring for the first time are sentenced
It is disconnected whether to need to adjust Hanging Basket absolute altitude, if it is, providing the Hanging Basket absolute altitude after adjustment；Second after concrete has been poured
My god, the first absolute altitude of all the first measuring points constructed in beam section, the second measuring point and the 3rd measuring point is measured, the of this beam section is measured
Second absolute altitude of one measuring point, the second measuring point and the 3rd measuring point, and measuring point is set up according to first absolute altitude and second absolute altitude
With the relation of bottom elevation；Cross dimensions is checked, beam section concrete overweight condition is counted；After prestressed reinforcement of tensioning, institute is measured
There is the 3rd absolute altitude of the first measuring point constructed in beam section, the second measuring point and the 3rd measuring point；According to the 3rd of a upper construction period the
Absolute altitude, stress, temperature computation and the Hanging Basket positioning absolute altitude for forecasting next construction period of measuring point.
Preferably, each observation time is arranged on before sunrise.
Preferably, the content observed every time includes one or more in the following：Before being poured per stage concrete
Elevation；Elevation afterwards, before prestressed stretch-draw is poured per stage concrete；Height after per stage prestressed stretch-draw, before Hanging Basket walking
Journey；Per the elevation after the walking of stage Hanging Basket；Remove Hanging Basket after, end bay close up before elevation；Final Cheng Qiaoqian elevation.
Preferably, measure the item during Hanging Basket absolute altitude after first measurement and positioning includes：The absolute altitude of second measuring point, expires it
The predetermined bottom plate mould absolute altitude of foot；Top plate mould absolute altitude, the top plate mould absolute altitude is bottom plate mould absolute altitude+deck-molding；It is all
First measuring point absolute altitude of beam section of constructing；3rd measuring point absolute altitude, and calculate the 3rd measuring point of every side and the elevation difference of the second measuring point.
Preferably, measurement content is needed to include during concrete curing：First measuring point absolute altitude of all beam sections of having constructed；3rd
Measuring point absolute altitude according to the 3rd measuring point to obtain the second measuring point absolute altitude.
Preferably, need measurement content as follows after prestressed reinforcement of tensioning：First measuring point absolute altitude of all beam sections of having constructed；The
Three measuring point absolute altitudes according to the 3rd measuring point to obtain the second measuring point absolute altitude.
It can be easier to realize observation using the T-shaped firm structure line style monitoring point mounting structure of the cantilever in the present invention, so as to protect
Bridge line style is demonstrate,proved into, the risk of construction is reduced, construction speed, and operation very simple is improved, does not interfere with construction technology
Level, can be effectively by line type control control errors in predetermined scope.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.
The present invention is further detailed explanation below.
Brief description of the drawings
The Figure of description for constituting the part of the present invention is used for providing a further understanding of the present invention, and of the invention shows
Meaning property embodiment and its illustrate be used for explain the present invention, do not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is a kind of schematic diagram of the T-shaped firm structure of cantilever；
Fig. 2 is the measuring point mounting structure schematic diagram of the T-shaped firm structure of cantilever in the present invention；
Fig. 3 is the 0# block absolute altitude measuring point distribution schematic diagrams of the T-shaped firm structure of cantilever in Fig. 2；
Fig. 4 is the fulcrum section absolute altitude measuring point distribution schematic diagram of the T-shaped firm structure of cantilever in Fig. 2；
Fig. 5 is the span centre section absolute altitude measuring point distribution schematic diagram of the T-shaped firm structure of cantilever in Fig. 2；
Fig. 6 is the side elevation schematic diagram of per stage point layout in the present invention；
Fig. 7 is the positive elevational schematic view of per stage point layout in the present invention.
Reference in figure：1st, the first measuring point；2nd, the second measuring point；3rd, the 3rd measuring point；4th, Hanging Basket bed die；5th, construction section；
6th, current construction section.
Embodiment
It should be noted that in the case where not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, should all belong to the model that the present invention is protected
Enclose.
Long-span rigid frame bridge, Ji Gaodun, Long span, pier girder construction stress and its complexity, therefore stability, line
The problems such as type control, quality control and construction method is the emphasis of large span rigid frame bridge type.Cantilever-construction is to build this kind of bridge
Beam is the most economical, efficient construction method.
The T-shaped firm structure line style monitoring point mounting structure of cantilever and its line type control monitoring method in the application, it is particularly suitable
In the T-shaped firm structure construction line type control monitoring technology of large span long cantilever, including line type control, displacement measuring points arrangement, observation technology,
Technology contents in terms of the constructions such as Hanging Basket positioning.
Fig. 1 shows a kind of structural representation of (80+80) m prestressed concrete T-Frame bridges of the present invention.The T
The firm structure of type have that span is big, section is more, pre-stress system is multidirectional and it is complicated the features such as.It is many not true due to existing in work progress
Determine factor, be designed to that the requirement of bridge line style, by line type control monitoring technology, Real time identification is carried out to Construction State, is adjusted to reach
Whole, prediction, is in construction system Guaranteed, and then makes design object safety, smoothly realizes.
In the T-shaped firm structure shown in Fig. 1, bridge body section uses single box single chamber, the straight web form of variable cross-section.Box beam top width
12.6m, box beam bottom width 7.0m.Top plate thickness is 400mm in addition near beam-ends and near central bearing point；Web thickness 550-900mm,
Change by broken line；Bottom plate thickness is changed to the 1200mm of root by the 400mm of span centre by second-degree parabola.It is complete be associated in end fulcrum and in
4 road diaphragm plates are set at fulcrum altogether.Tabula plate thickness：Hold 1.6m at 1.5m at fulcrum, central bearing point.Diaphragm plate is provided with hole, for inspection
The personnel of looking into pass through.The coxostermum of box beam two is with using circular arc chamfering transition on the outside of roof and floor intersection.Girder effective span is (80
+ 80) m, bearing center line to beam-ends 0.75m, beam total length 161.5m.Deck-molding is 9.0m at central bearing point kernel of section；End bay
Contour section of 10.75m, deck-molding is 4.5m at kernel of section.Beam body uses C55 concrete, and end-blocking uses C55 concrete, pier bottom one
Determine to use C55 anti-erosion concrete in scope, sealing off and covering anchorage end uses strength grade for C60 expansive concretes, protecting wall, shield
And cable trough straight wall strength grade of concrete is C40.
In the prestress system of the T-shaped firm structure shown in Fig. 1, longitudinal prestressing steel Shu Caiyong tensile strength standard values are
1860MPa high-strength underrelaxation steel strand wires, nominal diameter 15.2mm, its technical conditions should meet the standards of GB/T5224-2003.
Pipeline is formed by internal diameter 90mm metal bellows.Metal bellows should meet《Metal bellows for prestressed concrete》
(JCT225-2007) are required；Anchorage should meet《Railway engineering use for tendon strand tapered anchorage, fixture and connector technique bar
Part》(TB/T3193-2008), tensioning uses matched anchorage equipment.Lateral prestressing tendon uses tensile strength standard
It is worth the high-strength underrelaxation steel strand wires for 1860MPa, nominal diameter 15.2mm, its technical conditions should meet the marks of GB/T5224-2003
It is accurate.Using BM15-5 (P) anchorage and anchoring system；Tensioner uses YDC240Q type jack；Pipeline uses 90 × 19mm
Flat metal bellows pore-forming.No. 0 block of vertical prestressed reinforcement uses the steel strand wires of 3-7 Φ 5, tension normal intensity fpk=
1860MPa, using the low shrinkage anchorages of DSM15-3, the supporting low retraction stretch-draw jack of the type punchings of use YCD1000-75,
Internal diameter 50mm metal bellows pore-formings, remaining vertical prestressing steel Shu Caiyong Φ 25mm prestressed concrete spirals, model
PSB830, tensile strength standard value is 830MPa, and its technical conditions should meet the standards of GB/T 20065-2006, and anchoring system is adopted
With the type anchorages of JLM -25；Tensioning uses YC80 type jack；Pipeline is formed by internal diameter Φ 35mm conduit peschel pore-formings.
In the prestress system of the T-shaped firm structure shown in Fig. 1, using Hanging Basket cantilever construction mode, cantilever-construction is pre-
The main construction method of prestressed concrete T structures, for prestressed concrete T shaped bridge bridge, though had perhaps using Cantilever Construction Method
Many advantages, but being formed for this kind of bridge will be by a complicated process, when across footpath is larger, to ensure to close up preceding two cantilever
Hold the deviation of vertical deflection to be no more than permissible range, the work progress of such bridge must be controlled.Deflection observation data is
The topmost foundation of bridge line style is controlled into, by taking the prestressed concrete T shaped bridge line style in Fig. 1 as an example, its monitoring section is located at each
The end in stage, as shown in Figure 2.
Therefore, the invention provides a kind of T-shaped firm structure line style monitoring point mounting structure of cantilever, including：First measuring point 1,
Two measuring points 2 and the 3rd measuring point 3, in pre-buried first lengths of rebar in top of the beam block of the T-shaped firm structure of cantilever, first lengths of rebar it is upper
Distal process is for the top at the top, and first measuring point 1 is arranged on the top of first lengths of rebar.Second measuring point 2
In the front-end template for being set directly at the Hanging Basket bed die of the beam block；The bottom of the beam block with before the Hanging Basket bed die 4
Hold and the second lengths of rebar is provided with corresponding position, the 3rd measuring point 3 is arranged on the top of second lengths of rebar.
Wherein it is preferred to, the distance between front end face of first lengths of rebar and the beam block is 10 centimetres.It is preferred that
The length of appearing of ground, first lengths of rebar and/or second lengths of rebar is 2-3 centimetre.
Preferably, the number of first measuring point 1 is three, and/or the number of second measuring point 2 is two.
Fig. 3 is refer to, arrangement 0# block absolute altitude measuring points are the designed elevations for controlroof, while each outstanding after also serving as
Pour stage elevation observation datum mark, it is preferable that the top plate of each 0# blocks respectively arranges 7 elevation observation stations.
As shown in Figure 3 and Figure 4, in the cantilever stage, 11 symmetrical elevation observation stations are arranged on each monitoring section.This
Whether sample, can not only measure the amount of deflection of box beam, twisted deformation while box beam can be observed.
It is highly preferred that first lengths of rebar and/or second lengths of rebar of absolute altitude measuring point use the round steel of Φ 16
Muscle.Preferably, red paint is scribbled after being polished at the top of round bar, is used for marking.
The setting arrangement principle of each measuring point in the present invention is as follows：
(1) close proximity to web；
(2) measuring point is from beam section end 10cm；
(3) without prejudice to construction and Hanging Basket are walked, fixed；
(4) it is easy to protection；
(5) trying one's best reduces measurement work, and it is that can test the elevation of whole measuring points such as to found an instrument, is preferably disposed on
On the inside of Hanging Basket, it can also so reduce and turn error caused by instrument.
By adopting the above-described technical solution, can using the T-shaped firm structure line style monitoring point mounting structure of cantilever in the present invention
To be easier to realize observation, so as to ensure into bridge line style, the risk of construction is reduced, construction speed is improved, and operate very
Simply, the level of construction technology is not interfered with, can be solved existing effectively by line type control control errors in predetermined scope
The problem of being set in technology due to its measuring point, it is difficult to ensure into bridge line style, construction risk is larger, and construction speed is slow, and operation is multiple
Miscellaneous, influence is known clearly the level of construction technology, causes the problem of line type control error is excessive.
Incorporated by reference to Fig. 1, the construction monitoring of this bridge is mainly the Deformation control of beam, and Deformation control is exactly strict control per single order
Duan Liang vertical deflection, if having deviation and larger deviation, just must carry out error analysis immediately and determine method of adjustment, be
Next stage, more accurately work was ready in construction.
The Cantilever Construction Method that beam structure is used belongs to typical from erection construction method, for this bridge, due to
In work progress has been leeway can not adjust afterwards or adjustable very little into structure (cantilever stage) state, so,
For the structure and construction characteristic of girder, the construction monitoring of beam portion mainly uses PREDICTIVE CONTROL method-line style monitoring and controlling technology.
PREDICTIVE CONTROL method refers in comprehensive various factors for considering influence bridge structural state and the construction mesh to be reached
After mark, the state before and after being formed to each construction stage of structure is predicted, and construction is carried out along predetermined state.Due to
With the presence of error between predicted state and virtual condition, influence of certain error to construction target is then in the prediction of subsequent construction state
In pay attention to, circulated with this, until construction is completed and obtains and design the configuration state being consistent.
Bridge in Fig. 1 is prestressed concrete T shaped bridge, using cantilever construction.The formation of such bridge will be by a complexity
Process, working procedure and construction stage be more, and each stage influences each other, and it is this influence each other and variant, this is resulted in
The phenomenon of off-design value, even more than design allow with concreting process change for the internal force in each stage and displacement
Internal force and displacement, if not found, being adjusted in time in time by effective Construction control, it is possible to cause the beam body line of bridge completion state
Type do not meet design requirement or in work progress structure it is dangerous.
In work progress, to ensure that closing up the deviation of front boom end vertical deflection, the lateral displacement of girder axis does not surpass
Cross permissible range, ensure that the Deck after closing up is good, it is necessary to which bright are made to construction control parameters such as the amounts of deflection of the bridge girder
True regulation, and effectively managed and controlled in construction, to ensure safety of the bridge in work progress, and ensure
Cheng Qiaohou Main beam linearities meet design requirement.
For the prestressed concrete T shaped bridge that cantilever pouring stage by stage is constructed, Construction control is exactly according to construction monitoring
The structural parameters actual value of gained carries out construction stage calculating, determines the mould absolute altitude in each cantilever stage, and constructing
Prediction is carried out to error according to the achievement of construction monitoring in journey and next stage mould absolute altitude is adjusted, is come with this
Ensure into the Deck after bridge, ensure the relative deviation no more than setting of closure segment cantilever absolute altitude.
The reliability and peace of structure in work progress are to ensure that to the purpose that the Surveillance of Continuous Beam part carries out construction monitoring
Quan Xing, it is ensured that bridge meets design requirement into bridge Deck, major control content is Main beam linearity and controlling sections stress.
Therefore, present invention also offers a kind of T-shaped firm structure line type control monitoring method of cantilever, to make each of Construction control
Step procedure, Construction control working procedure has been formulated according to specific construction speed arrangement.Pass through the T-shaped firm structure line style of the cantilever
Monitoring method is controlled, is finally satisfied by the error of all each points of this bridge Cheng Qiaohou line style with being designed to bridge line style《Railway
Construction of bridge and culvert inspection of quality tentative standard》Regulation, the line type control monitoring technology determines Hanging Basket during cantilever construction
The difference of position absolute altitude and forecast absolute altitude is controlled within 0.5cm, after longitudinal prestressing steel Shu Zhangla is complete, beam-ends measuring point absolute altitude and control
The difference of group's forecast absolute altitude is controlled in ± 0.5cm, into bridge line style and design line style error between+1.5cm and -0.5cm, is closed
Hold together error within 1.5cm.
In one embodiment, each implementation cycle in the T-shaped firm structure line type control monitoring method of cantilever in the present invention
In control flow it is as follows, wherein, from Hanging Basket reach positioning finished to prestressed strand tensioning be this bridge construction a week
Phase：
Step 1, according to predetermined Hanging Basket positioning absolute altitude positioning Hanging Basket, and the Hanging Basket absolute altitude after first measurement and positioning；Then,
Shuttering, assembling reinforcement；
Step 2, measuring point is set according to the above-mentioned T-shaped firm structure line style monitoring point mounting structure of cantilever；
Step 3, before casting concrete, all elevation measuring points constructed in beam section, repetition measurement Hanging Basket absolute altitude, pier top are measured
Horizontal displacement；
Step 4, judged whether to need to adjust Hanging Basket absolute altitude according to the Hanging Basket absolute altitude and the Hanging Basket absolute altitude of repetition measurement that measure for the first time,
If it is, providing the Hanging Basket absolute altitude after adjustment；
Step 5, second day after concrete has been poured, measures all the first measuring points constructed in beam section, the second survey
First absolute altitude of point and the 3rd measuring point, measures the second absolute altitude of first measuring point, the second measuring point and the 3rd measuring point of this beam section, and root
The relation of measuring point and bottom elevation is set up according to first absolute altitude and second absolute altitude；
Step 6, press《Railway engineering check evaluation criterion》Cross dimensions is checked, beam section concrete overweight condition is counted；
Draw after deformed bar, measure the 3rd absolute altitude of all the first measuring points constructed in beam section, the second measuring point and the 3rd measuring point；
Step 7, according to the absolute altitude of the 3rd measuring point 3 of a upper construction period, stress, temperature computation and forecast it is next construction week
The Hanging Basket positioning absolute altitude of phase.
The key of working procedure is：The end of each construction cyclic process must carry out comprehensive to completed section
The error of measurement, analysis practice of construction result and scheduled target, so as to be adjusted in time to the error occurred, is reaching
After permissible accuracy, forecast could be made to next construction circulation.
To reduce the influence of temperature as far as possible, the sun comes out progress, rank of each constructing before in the morning for the observation arrangement of amount of deflection
The deformation test time of section determines according to the progress of construction stage, i.e., each observation time is arranged on before sunrise.Preferably, often
The content of secondary observation includes one or more in the following：
(1) elevation before being poured per stage concrete；
(2) elevation afterwards, before prestressed stretch-draw is poured per stage concrete；
(3) elevation after per stage prestressed stretch-draw, before Hanging Basket walking；
(4) per the elevation after the walking of stage Hanging Basket；
(5) remove after Hanging Basket, side (in) elevation before closing up；
(6) final Cheng Qiaoqian elevation.
This number beam block prestressed stretch-draw is proceeded to from Hanging Basket to finish as a construction stage, needs to complete in each construction stage
Work it is as follows：
Hanging Basket is positioned：Hanging Basket positioning, positioning bed die front end absolute altitude and top elevation are carried out according to predetermined mould absolute altitude, needed
The measuring point to be set as shown in Figures 2 to 5, wherein, the first measuring point is apart from beam block front end 10cm, before the block concrete is poured
It is embedded；Second measuring point is directly arranged in template without setting steel bar end；Before 3rd measuring point is close proximity to the beam block bed die
End, steel bar end length 10cm or so.
Due to needing that bed die front end absolute altitude is measured after casting concrete, to eliminate other factors influence, fixed
Position when, on bed die close proximity to this beam block bed die front end each side set reinforcing bar first, positioning when need measurement
The elevation difference of (Fig. 6 and Fig. 7) the second measuring point and the 3rd measuring point, only can be surveyed after casting concrete and after stretch-draw prestressing force to the 3rd
Point is measured, and utilizes the absolute altitude of the measuring point of absolute altitude differential conversion second.
Preferably, measure the item during Hanging Basket absolute altitude after first measurement and positioning includes：
The absolute altitude of (1) second measuring point 2, makes it meet predetermined bottom plate mould absolute altitude；
(2) top plate mould absolute altitude, the top plate mould absolute altitude is bottom plate mould absolute altitude+deck-molding；
(3) absolute altitude of the first measuring point 1 of all beam sections of having constructed；
The absolute altitude of (4) the 3rd measuring point 3, and calculate the 3rd measuring point 3 of every side and the elevation difference of the second measuring point 2.
During casting concrete, Hanging Basket positioning absolute altitude is checked, it is ensured that start casting concrete again after absolute altitude is errorless.
Preferably, measurement content is needed to include during concrete curing：
(1) absolute altitude of the first measuring point 1 of all beam sections of having constructed；
The absolute altitude of (2) the 3rd measuring point 3 according to the 3rd measuring point 3 to obtain the absolute altitude of the second measuring point 2.
Preferably, need measurement content as follows after prestressed reinforcement of tensioning：
(1) absolute altitude of the first measuring point 1 of all beam sections of having constructed；
The absolute altitude of (2) the 3rd measuring point 3 according to the 3rd measuring point 3 to obtain the absolute altitude of the second measuring point 2.
In summary, T structures are statically determinate structures in Cantilever Construction, if do not applied extra ballast during closing up, into
Internal force status does not deviate by design load typically much after bridge, therefore the main target of T structure Construction controls is the line style for controlling girder.
If there is error in beam section of having constructed, in addition to tensioning preparation prestressing tendon, the leeway not adjusted substantially, and this adjustment amount
It is very limited amount of, and it is unfavorable to beam body stress.Therefore, once there is line style error, error will be permanently present.
Purpose and meaning that the application is monitored from line type control, the principle and method of line type control monitoring, line type control prison
Concrete operations flow and the technology implementation of survey are set out in terms of requiring three, and there is provided a kind of T-shaped firm structure construction line of large span long cantilever
The monitoring method and key control point of type control monitoring technology, the line type control monitoring technology effectively raise construction technology water
It is flat, the problem of line type control error is excessive is solved, there is directive significance for the T-shaped firm structure construction of large span long cantilever, simultaneously
Also there is obvious economic benefit and social benefit.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
1. a kind of T-shaped firm structure line style monitoring point mounting structure of cantilever, it is characterised in that including：First measuring point (1), the second measuring point
(2) and the 3rd measuring point (3), in pre-buried first lengths of rebar in top of the beam block of the T-shaped firm structure of cantilever, the upper end of first lengths of rebar
The top at the top is protruded from, first measuring point (1) is arranged on the top of first lengths of rebar；Second measuring point
(2) in the front-end template for being set directly at the Hanging Basket bed die of the beam block；The bottom of the beam block with the Hanging Basket bed die (4)
The corresponding position in front end at be provided with the second lengths of rebar, the 3rd measuring point (3) is arranged on the top of second lengths of rebar.
2. the T-shaped firm structure line style monitoring point mounting structure of cantilever according to claim 1, it is characterised in that first steel
Muscle section is 10 centimetres with the distance between the front end face of the beam block.
3. the T-shaped firm structure line style monitoring point mounting structure of cantilever according to claim 1, it is characterised in that first steel
The length of appearing of muscle section and/or second lengths of rebar is 2-3 centimetre.
4. the T-shaped firm structure line style monitoring point mounting structure of cantilever according to claim 1, it is characterised in that described first surveys
The number of point (1) is three, and/or the number of second measuring point (2) is two.
5. a kind of T-shaped firm structure line type control monitoring method of cantilever, it is characterised in that the control flow in each implementation cycle is such as
Under：
Hanging Basket absolute altitude after Hanging Basket, and first measurement and positioning is positioned according to predetermined Hanging Basket positioning absolute altitude；
The T-shaped firm structure line style monitoring point mounting structure of cantilever according to any one of claim 1-4 sets measuring point；
Before casting concrete, all elevation measuring points constructed in beam section, repetition measurement Hanging Basket absolute altitude, the horizontal position of pier top are measured
Move；
Hanging Basket absolute altitude and the Hanging Basket absolute altitude of repetition measurement according to measuring for the first time judge whether to need to adjust Hanging Basket absolute altitude, if it is,
Provide the Hanging Basket absolute altitude after adjustment；
Second day after concrete has been poured, measure all the first measuring points constructed in beam section, the second measuring point and the 3rd survey
First absolute altitude of point, measures the second absolute altitude of first measuring point, the second measuring point and the 3rd measuring point of this beam section, and according to described first
Absolute altitude and second absolute altitude set up the relation of measuring point and bottom elevation；
Cross dimensions is checked, beam section concrete overweight condition is counted；
After prestressed reinforcement of tensioning, the 3rd of all the first measuring points constructed in beam section, the second measuring point and the 3rd measuring point is measured
Absolute altitude；
According to absolute altitude, stress, temperature computation and the Hanging Basket for forecasting next construction period of the 3rd measuring point (3) of a upper construction period
Position absolute altitude.
6. the T-shaped firm structure line type control monitoring method of cantilever according to claim 5, it is characterised in that each observation time
It is arranged on before sunrise.
7. the T-shaped firm structure line type control monitoring method of cantilever according to claim 6, it is characterised in that observes every time is interior
Appearance includes one or more in the following：
(1) elevation before being poured per stage concrete；
(2) elevation afterwards, before prestressed stretch-draw is poured per stage concrete；
(3) elevation after per stage prestressed stretch-draw, before Hanging Basket walking；
(4) per the elevation after the walking of stage Hanging Basket；
(5) remove Hanging Basket after, end bay close up before elevation；
(6) final Cheng Qiaoqian elevation.
8. the T-shaped firm structure line type control monitoring method of cantilever according to claim 5, it is characterised in that first measurement and positioning
Measure the item during rear Hanging Basket absolute altitude includes：
The absolute altitude of (1) second measuring point (2), makes it meet predetermined bottom plate mould absolute altitude；
(2) top plate mould absolute altitude, the top plate mould absolute altitude is bottom plate mould absolute altitude+deck-molding；
(3) the first measuring point (1) absolute altitude of all beam sections of having constructed；
(4) the 3rd measuring point (3) absolute altitudes, and calculate the 3rd measuring point (3) of every side and the elevation difference of the second measuring point (2).
9. the T-shaped firm structure line type control monitoring method of cantilever according to claim 5, it is characterised in that concrete curing phase
Between need measurement content include：
(1) the first measuring point (1) absolute altitude of all beam sections of having constructed；
(2) the 3rd measuring point (3) absolute altitudes according to the 3rd measuring point (3) to obtain the second measuring point (2) absolute altitude.
10. the T-shaped firm structure line type control monitoring method of cantilever according to claim 5, it is characterised in that stretch-draw prestressing force steel
Need measurement content as follows after muscle：
(1) the first measuring point (1) absolute altitude of all beam sections of having constructed；
(2) the 3rd measuring point (3) absolute altitudes according to the 3rd measuring point (3) to obtain the second measuring point (2) absolute altitude.
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Application publication date: 20170728 |