CN112593491B - Continuous beam bridge construction line shape self-adaptive control method based on deformation monitoring radar - Google Patents
Continuous beam bridge construction line shape self-adaptive control method based on deformation monitoring radar Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/10—Cantilevered erection
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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
- E01D1/00—Bridges in general
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- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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Abstract
The invention provides a continuous bridge construction linear adaptive control method based on a deformation monitoring radar, which is characterized in that targets are distributed on constructed beam sections of a cradle and a main beam, deformation of the cradle and the constructed beam sections of the main beam in a construction state and a non-construction state are monitored in real time through the deformation monitoring radar, a structural deformation value in the monitored construction state is compared with a theoretical value for analysis, construction linear control parameters of subsequent beam sections of the main beam are adjusted in real time according to a comparison analysis result and an actual structural deformation rule in the non-construction state, the construction linear control parameters are adapted to the actual structural deformation, and adaptive control of the construction linear of the continuous bridge is realized. According to the invention, the bridge is continuously monitored by matching the deformation monitoring radar with the target, the influence of the load change under the construction working condition and the influence of the change of the external condition under the non-construction state are considered, the actual linear shape of the structure is enabled to be consistent with the designed linear shape, and the self-adaptive control of the linear shape of the cantilever casting continuous beam bridge is realized.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a continuous bridge construction line-shape self-adaptive control method based on a deformation monitoring radar.
Background
The cantilever casting continuous beam bridge construction requirement ensures that the main beam is smooth in line shape and meets the design requirement. At present, in the prior art, optical instruments such as a level gauge and the like are mainly adopted to carry out linear control on a continuous beam bridge, and the defects of the prior method are mainly shown as follows:
1) The optical instrument is greatly influenced by illumination, is used under the condition of darker light, and is influenced in test precision.
2) The optical instrument can not realize multipoint simultaneous testing, can only realize single-point circulating testing, and has large workload and large accidental error.
3) Under the influence of field construction conditions, an optical instrument is adopted for testing, test points arranged on the field are seriously damaged, the continuity of test data is seriously influenced, and the linear control of the continuous beam bridge is greatly influenced.
4) The continuous beam bridge constructed by the cantilever pouring cannot realize real-time continuous monitoring and linear adaptive control of the continuous beam bridge construction.
5) If a level gauge is used for testing an optical instrument, the test result cannot be cleared up in time and cannot be fed back in time.
The defects can cause serious deviation in the line shape of the main beam, the construction progress of the bridge is influenced if the deviation is small, and the construction quality and the safety of the bridge are influenced if the deviation is large.
In summary, there is a need for a continuous bridge construction line-shape adaptive control method based on a deformation monitoring radar to solve the problems in the prior art.
Disclosure of Invention
The invention aims to provide a continuous bridge construction line shape self-adaptive control method based on a deformation monitoring radar, which aims to solve the problems of bridge construction line shape control in the prior art, and the specific technical scheme is as follows:
the utility model provides a linear adaptive control method of continuous beam bridge construction based on deformation monitoring radar, lay the mark target at each beam section that basket and girder have been under construction, through deformation monitoring radar real-time supervision construction state under with under the non-construction state hang basket deformation with each beam section deformation that the girder has been under construction, carry out contrastive analysis with theoretical value with the structural deformation value under the construction state of monitoring, according to contrastive analysis result and the real law of deformation of structure under the non-construction state follow-up each beam section construction linear control parameter of girder real-time adjustment, make the linear control parameter of construction and the actual deformation of structure adapt to, realize the linear adaptive control of continuous beam bridge construction.
Preferably, the deformation monitoring under the construction state of the continuous beam bridge comprises the following steps:
step A: monitoring deformation of the pre-pressing working condition of the hanging basket: laying targets on constructed beam sections of the hanging basket and the main beam, applying a pre-load to the hanging basket, and measuring a hanging basket deformation curve through a deformation monitoring radar, wherein the hanging basket deformation curve is used for providing a pre-estimated hanging basket deformation value for a vertical mold elevation of the constructed beam section;
and B: monitoring the deformation of the casting concrete working condition: concrete pouring is carried out on the construction beam sections, deformation monitoring radars are used for monitoring deformation of the hanging baskets and deformation of each beam section of the constructed main beam in real time, and a hanging basket deformation curve of the construction beam section in the concrete pouring construction process and deformation curves of each beam section of the constructed main beam are obtained;
step C: and (3) monitoring the working condition deformation of the tensioned prestressed steel beam: stretching the prestressed steel beams of the construction beam sections, and monitoring the deformation of each constructed beam section of the main beam in real time by a deformation monitoring radar to obtain deformation curves of each constructed beam section of the main beam under the working condition of stretching the prestressed steel beams;
step D: monitoring the deformation of the working condition of the movable hanging basket: the construction of the construction beam section is completed, the hanging basket is moved to prepare the construction of the next construction beam section, and the deformation monitoring radar monitors the deformation of each constructed beam section of the main beam in the moving process of the hanging basket in real time to obtain the deformation curve of each constructed beam section of the main beam in the moving hanging basket construction process;
and E, step E: d, after the hanging basket is moved in place, arranging targets on the construction beam section constructed in the step D;
step F: and repeating the steps B to E until the continuous beam bridge is closed.
Preferably among the above technical scheme, the mark target sets up in the tip that the beam segment is close to next section construction beam segment, and the mark target sets up in beam segment bottom plate bottom surface.
Preferably, the layout position of the target at the end part of the beam section corresponds to the layout position of the target on the lower beam of the hanging basket.
Preferably among the above technical scheme, step A carries out the pre-compaction load to hanging the basket in grades, and deformation monitoring radar carries out real-time supervision to hanging basket pre-compaction deformation, acquires hanging basket grading pre-compaction overall process deformation curve.
Preferably, in the above technical scheme, the maximum load of the graded pressing pre-pressure load is greater than the weight of the construction beam section to be constructed next.
Preferably, the deformation curve of the hanging basket in the step B is used for providing an estimated deformation value of the hanging basket for the elevation of the vertical mold of the next construction beam section.
Preferably, in the above technical scheme, in a non-construction state, the deformation monitoring radar monitors each constructed beam section of the cradle and the main beam in real time to obtain deformation curves of each constructed beam section of the cradle and the main beam when external conditions change.
Preferably, in the above technical solution, the external condition change means that one or more of air temperature, main beam temperature, and temporary load change.
Preferably in the above technical scheme, the target is a metal triangular pyramid, and the target is adhered to the hanging basket and each beam section through structural adhesive.
The technical scheme of the invention has the following beneficial effects:
deformation monitoring is carried out on the bridge in a construction state and a non-construction state (namely a natural state) through a deformation monitoring radar, wherein the construction state monitoring comprises the monitoring of a cradle prepressing process, a concrete pouring construction process, a tension prestressed steel beam construction process and a movable cradle construction process; monitoring in all other time periods except the construction state monitoring is non-construction state monitoring; the method comprises the steps that a deformation monitoring radar is matched with a target to realize uninterrupted monitoring of a bridge from pouring construction to closure completion, the influence of construction working condition load change and the influence of external condition change in an unfinished state are considered, the deformation rule of a main beam structure under the condition that the load effect and other external conditions change is obtained, the deformation monitoring value and the theoretical value are compared and analyzed, the deformation rule of the main beam structure under the condition that the external conditions change is analyzed, and data support is provided for subsequent construction linear control; adjusting high-grade linear control parameters of the vertical formwork marks of the next construction beam section according to deformation curves of the hanging basket and each beam section of the main beam, enabling the actual linear shape of the structure to be consistent with the designed linear shape, and finally realizing the self-adaptive control of the linear shape of the cantilever casting continuous beam bridge (construction); the method effectively overcomes the defect that the prior art adopts optical instruments such as a level gauge and the like to carry out the linear control of the continuous beam bridge.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of monitoring the construction of a continuous beam bridge by a deformation monitoring radar in embodiment 1;
FIG. 2 is a schematic view of monitoring the pre-pressing working condition stage of the cradle in embodiment 1;
FIG. 3 is a schematic view of monitoring the working condition stage of concrete pouring in example 1;
FIG. 4 is a schematic view of the arrangement of the targets on the beam sections in example 1;
FIG. 5 is a schematic view showing the influence of temperature change on the main beam structure in embodiment 1;
FIG. 6 is a schematic view showing deformation monitoring of a main girder in the suspension casting construction of a continuous girder bridge in example 1;
FIG. 7 is a graph of monitoring deformation of a middle measuring point of a lower cross beam of the hanging basket in the whole process of graded prepressing of the hanging basket in embodiment 1;
FIG. 8 is a graph of monitoring deformation of the middle measuring point of the lower beam of the hanging basket under the working condition of pouring concrete in the 11# beam section in embodiment 1;
FIG. 9 is a graph of monitoring deformation of a middle measuring point of a No. 11 beam segment in example 1 under a working condition of pouring concrete in the No. 10 beam segment;
FIG. 10 is a graph of monitoring deformation of a middle measuring point of a lower beam of a prestressed steel strand hanging basket for tensioning a No. 11 beam section in example 1;
FIG. 11 is a graph of deformation of a middle measuring point of a 10# beam section under a working condition of the movable cradle in embodiment 1;
the device comprises a pier top support cast-in-place beam 1, a pier top support cast-in-place beam 2, a hanging basket 3, a target 4, a pier 5 and a deformation monitoring radar.
Detailed Description
Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Example 1:
referring to fig. 1-11, a continuous bridge construction linear adaptive control method based on a deformation monitoring radar lays targets 3 on a cradle 2 and each constructed beam section of a main beam, the deformation of the cradle and the deformation of each constructed beam section of the main beam under the construction state and the non-construction state are monitored in real time by a deformation monitoring radar 5, the monitored structural deformation value under the construction state is compared with a theoretical value for analysis, and the construction linear control parameters of each subsequent beam section of the main beam are adjusted in real time according to the comparison analysis result and the actual structural deformation rule under the non-construction state, so that the construction linear control parameters are adapted to the actual structural deformation, and the construction linear adaptive control of a continuous bridge is realized.
In this embodiment, a span combination constructed by using a cantilever casting method is (90 +150+ 90) m continuous bridge, and the adaptive control method of the present application is described in detail as follows:
wherein, deformation monitoring under the continuous beam bridge construction state includes the following steps:
step A: monitoring deformation of the pre-pressing working condition of the hanging basket: arranging a target 3 on a hanging basket 2 and a constructed beam section of a main beam, applying a pre-pressing load to the hanging basket, and measuring a hanging basket deformation curve through a deformation monitoring radar 5, wherein the hanging basket deformation curve is used for providing a pre-estimated hanging basket deformation value for a vertical mold elevation of the constructed beam section;
referring to fig. 2, in the step a, the constructed beam section of the main beam is a pier top bracket cast-in-place beam 1 (or called pier top bracket cast-in-place beam section), that is, a 0# beam section arranged on a pier 4 in the figure, and in the step, targets 3 are arranged on the 0# beam section and the cradle 2.
Preferably, pre-pressing load is applied to the hanging basket in a grading mode in the step A, the deformation monitoring radar monitors pre-pressing deformation of the hanging basket in real time, and a deformation curve of the whole hanging basket grading pre-pressing process is obtained.
Further preferably, the maximum load of the graded pressing pre-load is larger than the weight of the construction beam section to be constructed next.
FIG. 7 is a monitoring curve diagram of deformation of a middle measuring point of a lower cross beam of the hanging basket in the whole hanging basket grading prepressing process, wherein the prepressing process is to apply loads of 20t, 40t, 60t, 80t, 100t, 120t and 0t to the hanging basket in sequence, and the deformation process of the middle measuring point of the lower cross beam of the hanging basket in which the prepressing load is gradually increased is illustrated in FIG. 7; deformation value monitoring results under the action of each graded prepressing load at the middle measuring point of the lower beam of the hanging basket under the prepressing working condition are collated and shown in table 1.
TABLE 1 arrangement of basket prepressing condition basket lower beam middle measuring point grading prepressing deformation monitoring results
| Loading weight (t) | 20 | 40 | 60 | 80 | 100 | 120 | 0 (unload) |
| Deformation value (mm) | 10.5 | 13.2 | 16.7 | 19.2 | 22.3 | 25.1 | 6.5 |
| Variation value (mm) | / | 2.7 | 3.5 | 2.5 | 3.1 | 2.8 | -18.6 |
According to the method, under the action of graded pre-pressing load, deformation of the cradle structure shows good linear change characteristics, the pre-pressing elastic deformation value of the cradle is 18.6mm, the inelastic deformation value is 6.5mm, the requirement that the elastic deformation value required in technical Specification for highway bridge and culvert construction (JTG/T3650-2020) is not more than 20mm is met, and the cradle structure meets the technical requirement of continuing to carry out next construction.
The method comprises the following steps of (1) applying a hanging basket prepressing deformation monitoring result:
from the above, the elastic deformation value of the cradle under the 120t load is 18.6mm. When the weight of the 1# beam section of the bridge is 106t, the estimated elastic deformation value of the cradle in the 1# beam section formwork erecting stage is as follows: 18.6 × 106/120=16.4mm.
The values of the elastic deformation value of the hanging basket, the design elevation and the construction pre-camber are estimated, and the final formwork erection elevation of each construction beam section is directly determined:
the construction beam section formwork erection elevation = construction beam section design elevation + construction beam section construction pre-camber + construction beam section estimated hanging basket elastic deformation value + estimated inelastic deformation value + expert experience adjustment value (if necessary).
By adopting the deformation monitoring radar technology, the structural deformation condition of the graded prepressing process of the cradle structure is continuously and completely reflected, visual and reliable basis is provided for further judging the stress characteristic of the structure, the vertical formwork elevation of a construction beam section is convenient to determine, the continuous beam bridge line shape is directly determined by the vertical formwork elevation, and the method achievement can provide important reliable basis for controlling the bridge line shape.
And B: monitoring the deformation of the working condition of pouring concrete: concrete pouring is carried out on the construction beam sections, deformation monitoring radars are used for monitoring deformation of the hanging baskets and deformation of each beam section of the constructed main beam in real time, and a hanging basket deformation curve of the construction beam section in the concrete pouring construction process and deformation curves of each beam section of the constructed main beam are obtained;
and the hanging basket deformation curve in the step B is used for providing an estimated hanging basket deformation value for the vertical mold elevation of the next construction beam section.
Referring to fig. 3, 8 and 9, a pouring 11# beam section is taken as an example, and fig. 8 and 9 illustrate deformation of a beam section bottom plate construction process, a beam section web construction process and a beam section top plate construction process; specifically, fig. 8 shows a monitoring curve of deformation of a middle measuring point of a lower beam of the hanging basket under the working condition of pouring concrete in the 11# beam section, and specific data are shown in table 2 in detail; FIG. 9 is a graph illustrating monitoring of deformation of a middle measuring point of a No. 11 beam section under a concrete pouring condition of a No. 10 beam section, and specific data are shown in Table 3 in detail.
Table 2. Finishing monitoring result of deformation of middle measuring point of lower beam of hanging basket under working condition of pouring 11# beam section concrete
| Pouring part | Beam section bottom plate | Beam section web | Beam section top plate | Cumulative deformation |
| Deformation value (mm) | 8.1 | 15.2 | 17.6 | 17.6 |
| Variation value (mm) | / | 7.1 | 2.4 | / |
Table 3. Working condition for pouring 11# beam section concrete and working condition for finishing deformation monitoring result of middle measuring point of 10# beam section
| Pouring part | Beam section bottom plate | Beam section web | Beam section top plate | Cumulative deformation |
| Deformation value (mm) | 0.3 | 0.6 | 0.7 | 0.7 |
| Variation value (mm) | / | 0.3 | 0.1 | / |
In the process of pouring the concrete of the 11# beam section, the deformation of the cradle structure shows better linear change characteristics (the working condition of the cradle structure under the working condition can be judged to be good, the cradle structure is in a safe and controlled state), and the deformation value of the cradle is 17.6mm. The deformation monitoring curves shown in fig. 8 and 9 visually reflect the whole deformation process of the lower cross beam middle measuring point of the hanging basket under the working condition of pouring 11# beam section concrete and the middle measuring point of the 10# beam section, and provide important reference for the estimated hanging basket deformation value of the next section of beam section, the section Liang Chongliang is 95t, the weight of the next section of beam is 80t, the estimated hanging basket deformation value of the next section Liang Jiaozhu concrete under the working condition is 17.6 × 80/95=14.8mm, and the deformation monitoring result is good for determining the vertical mold elevation of the beam section at the next stage.
The deformation curve of the hanging basket can provide pre-estimated deformation value of the hanging basket and judge the safety and stability of the hanging basket structure for the vertical mold elevation of the next construction beam section of the main beam, and provide data support for safety early warning of the hanging basket.
And comparing deformation curves of the hanging basket and each beam section of the main beam with theoretical values to obtain the condition that the actual deformation value of the main beam structure accords with the theoretical values, and well guiding the linear control of the subsequent construction of the continuous beam bridge.
Such as: and (3) pouring 11# beam section concrete, wherein the deformation value of the middle measuring point of the 10# beam section is 0.7mm, and the theoretical value is 1.2mm, so that the actual integral rigidity of the cantilever main beam can be inferred to be larger than the theoretical value, and the deformation value of the pre-judged beam section in subsequent construction is corrected, so that the theoretical calculated value is continuously close to the actual deformation value of the structure, and the optimal control of the linear shape of the cantilever continuous beam bridge is achieved.
And (4) analogizing the monitoring curve diagrams of deformation measuring points of other beam sections (1 # beam section to 10# beam section) under the working condition.
And C: and (3) monitoring the working condition deformation of the tensioned prestressed steel bundle: stretching the prestressed steel beams of the construction beam sections, and monitoring the deformation of each constructed beam section of the main beam in real time by a deformation monitoring radar to obtain deformation curves of each constructed beam section of the main beam under the working condition of stretching the prestressed steel beams;
referring to fig. 10, when the 11# beam section prestressed steel bundle is tensioned, the deformation value of the middle measuring point of the lower beam of the hanging basket is 3.1mm, the theoretical value is 3.3mm, and the theoretical value is close to the actual value. If the actual deformation monitoring value is 2.0mm, the actual deformation value is smaller than the theoretical value and the difference value is large, and the reasons that the actual structural rigidity is larger than the theoretical calculation structural rigidity, the prestress application of the segment is insufficient and the like need to be analyzed. And (4) monitoring graphs of deformation measuring points of other beam sections (1 # beam section to 10# beam section) and so on.
And comparing the deformation curve of each beam section of the main beam with a theoretical value to obtain the condition that the actual deformation value of the main beam structure accords with the theoretical value, and providing continuous and reliable structural deformation analysis data for the linear control of the subsequent construction of the continuous beam bridge.
Step D: monitoring the deformation of the working condition of the movable hanging basket: the construction of the construction beam section is completed, the hanging basket is moved to prepare the construction of the next construction beam section, and the deformation monitoring radar monitors the deformation of each constructed beam section of the main beam in the moving process of the hanging basket in real time to obtain the deformation curve of each constructed beam section of the main beam in the moving hanging basket construction process;
step E: d, after the hanging basket is moved in place, arranging targets on the construction beam section constructed in the step D;
step F: and repeating the steps B to E until the continuous beam bridge is closed.
Preferably, the target is arranged at the end part of the beam section close to the next construction beam section, and the target is arranged on the bottom surface of the bottom plate of the beam section, preferably, the distance between the target and the end surface of the beam is 20cm.
Preferably, the arrangement position of the target at the end part of the beam section corresponds to the arrangement position of the target on the lower beam of the hanging basket.
Referring to fig. 11, a deformation curve of the movable hanging basket from the position of the construction 11# beam section to the position of the construction 12# beam section at the middle measuring point of the 10# beam section is shown, and as can be seen from fig. 11, the deformation value of the middle measuring point of the 10# beam section is 1.1mm, the theoretical value is 1.0mm, and the theoretical value is close to the actual value. The monitoring curve diagrams of deformation measuring points of other beam sections (1 # beam section to 10# beam section) under the working condition are analogized in sequence.
And comparing the deformation curve of each beam section of the main beam with the theoretical value to obtain the condition that the actual deformation value of the main beam structure accords with the theoretical value, and providing structural deformation analysis data for the linear control of subsequent construction.
In the construction process, the deformation monitoring curves of the measuring points in the steps A to E are fitted into a girder bottom line shape, so that good data support is provided for the subsequent construction of the bridge, and particularly, please refer to FIG. 5, wherein marks I, II and III in the drawing are respectively a working condition girder bottom line shape after the prestress is tensioned, a working condition girder bottom line shape before the concrete is poured and a working condition girder bottom line shape after the concrete is poured.
And in a non-construction state, the deformation monitoring radar monitors the constructed beam sections of the hanging basket and the main beam in real time to acquire the deformation curves of the constructed beam sections of the hanging basket and the main beam when external conditions change.
The external condition change means that one or more of air temperature, main beam temperature and temporary load change.
Referring to fig. 5, fig. 5 is a diagram of a result arrangement of continuous monitoring on the deformation of a girder on the next day after a working condition of pouring concrete in a 16# beam section, a monitoring curve of the deformation of each measuring point is fitted into a bottom line shape of the girder (the girder is mainly influenced by a structural temperature field caused by temperature change), and a, b and c in the diagram are respectively marked as the bottom line shape when the temperatures are 15 ℃, 20 ℃ and 30 ℃; as can be seen from the figure, when the air temperature rises, the structural temperature field changes, which causes the line shape of the bottom of the main beam structure to change graphically: when the air temperature was increased from 15 ℃ (early 7 00) to 20 ℃ (12 am 00), the 16# beam segment end displacement value was-18 mm under the influence of the structural temperature field, and when the air temperature was increased from 20 ℃ (12 am 00) to 30 ℃ (4 pm), the 16# beam segment end displacement value was-26 mm under the influence of the structural temperature field. The construction specification requires that the testing time of the linear control of the continuous beam bridge construction is within the period of stable temperature in the early morning every day; according to the deformation monitoring data, it can be deduced that under the influence of a structural temperature field (external temperature), the elevation of the 16# beam end of the main beam is 18mm higher than 20 ℃ (12 at noon) when the elevation is 15 ℃ (early 7). Therefore, a reliable basis can be provided for adjusting the linear control parameters of the continuous beam bridge cantilever casting (construction), and the aim of consistent actual linear shape and designed linear shape of the main beam is finally achieved, so that the linear adaptive control of the continuous beam bridge (construction) is realized.
It should be noted that fig. 5 is only a schematic diagram illustrating an influence of air temperature on a main beam structure after a concrete pouring working condition is performed, and the influence of external condition changes on the main beam structure can be also monitored after other working conditions are completed; the deformation monitoring radar can be used for monitoring the whole construction process of the bridge in real time, and powerful data support is provided for the construction of the next stage.
In this embodiment, preferably, the target is a metal triangular pyramid, and the target is adhered to the hanging basket and each beam section through structural adhesive, as shown in detail in fig. 4.
In the cantilever casting continuous beam bridge construction process, a deformation monitoring radar technology is utilized to monitor a cradle prepressing working condition, a concrete casting working condition, a tension prestress steel beam working condition and a movable cradle working condition, real-time deformation monitoring on a main beam and a cradle structure under a construction state and a non-construction state is realized, a deformation rule of the main beam structure under the change of a load effect and other external conditions is obtained, a comparison analysis of a deformation monitoring value and a theoretical value and a deformation rule analysis of the main beam structure under the change of the external conditions are carried out, construction linear control parameters such as segment construction vertical mold marks are adjusted, the actual linear shape of the structure is enabled to be consistent with the designed linear shape, and finally adaptive control of the cantilever casting continuous beam bridge (construction) linear shape is realized.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A continuous bridge construction linear adaptive control method based on a deformation monitoring radar is characterized in that targets are distributed on constructed beam sections of a cradle and a main beam, deformation of the cradle and the constructed beam sections of the main beam are monitored in real time by the deformation monitoring radar in a construction state and a non-construction state, a structural deformation value in the monitored construction state is compared with a theoretical value for analysis, construction linear control parameters of subsequent beam sections of the main beam are adjusted in real time according to a comparison analysis result and an actual structural deformation rule in the non-construction state, the construction linear control parameters are adapted to the actual structural deformation, and adaptive control of construction linear of the continuous bridge is achieved;
the deformation monitoring under the construction state of the continuous beam bridge comprises the following steps:
step A: monitoring deformation of the pre-pressing working condition of the hanging basket: laying targets on constructed beam sections of the hanging basket and the main beam, applying a pre-load to the hanging basket, and measuring a hanging basket deformation curve through a deformation monitoring radar, wherein the hanging basket deformation curve is used for providing a pre-estimated hanging basket deformation value for a vertical mold elevation of the constructed beam section;
and B: monitoring the deformation of the casting concrete working condition: concrete pouring is carried out on the construction beam sections, deformation monitoring radars are used for monitoring deformation of the hanging baskets and deformation of each beam section of the constructed main beam in real time, and a hanging basket deformation curve of the construction beam section in the concrete pouring construction process and deformation curves of each beam section of the constructed main beam are obtained;
and C: and (3) monitoring the working condition deformation of the tensioned prestressed steel bundle: stretching the prestressed steel beams of the construction beam sections, and monitoring the deformation of each constructed beam section of the main beam in real time by a deformation monitoring radar to obtain deformation curves of each constructed beam section of the main beam under the working condition of stretching the prestressed steel beams;
step D: monitoring the deformation of the working condition of the movable hanging basket: the construction of the construction beam section is completed, the hanging basket is moved to prepare the construction of the next construction beam section, and the deformation monitoring radar monitors the deformation of each constructed beam section of the main beam in the moving process of the hanging basket in real time to obtain the deformation curve of each constructed beam section of the main beam in the moving hanging basket construction process;
step E: d, after the hanging basket is moved in place, arranging targets on the construction beam section constructed in the step D;
step F: repeating the step B and the step E until the continuous beam bridge is closed;
step A, pre-pressing load is applied to the hanging basket in a grading mode, a deformation monitoring radar monitors pre-pressing deformation of the hanging basket in real time, and a deformation curve of the whole hanging basket grading pre-pressing process is obtained;
the hanging basket deformation curve in the step B is used for providing a pre-estimated hanging basket deformation value for the vertical mould elevation of the next construction beam section;
and in a non-construction state, the deformation monitoring radar monitors the constructed beam sections of the hanging basket and the main beam in real time to acquire the deformation curves of the constructed beam sections of the hanging basket and the main beam when external conditions change.
2. The continuous bridge construction line shape adaptive control method based on the deformation monitoring radar as claimed in claim 1, wherein the target is arranged at the end part of the beam section close to the next construction beam section, and the target is arranged on the bottom surface of the beam section bottom plate.
3. The continuous beam bridge construction line shape adaptive control method based on the deformation monitoring radar as claimed in claim 2, wherein the layout position of the target at the end part of the beam section corresponds to the layout position of the target on the lower beam of the cradle.
4. The continuous bridge construction line shape adaptive control method based on deformation monitoring radar as claimed in claim 1, wherein the maximum load of the step pre-pressing load is larger than the weight of the construction beam section to be constructed next.
5. The continuous bridge construction linear adaptive control method based on the deformation monitoring radar as claimed in claim 1, wherein the external condition change refers to the change of one or more of air temperature, main beam temperature and temporary load.
6. The continuous bridge construction line-shape adaptive control method based on the deformation monitoring radar as claimed in any one of claims 1 to 5, wherein the target is a metal triangular pyramid, and the target is adhered to the cradle and each beam section through structural adhesive.
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