CN110924308A - Control method for construction errors in stage construction of large-span long-section continuous beam - Google Patents
Control method for construction errors in stage construction of large-span long-section continuous beam Download PDFInfo
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- CN110924308A CN110924308A CN201911261233.6A CN201911261233A CN110924308A CN 110924308 A CN110924308 A CN 110924308A CN 201911261233 A CN201911261233 A CN 201911261233A CN 110924308 A CN110924308 A CN 110924308A
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- E—FIXED CONSTRUCTIONS
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- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
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Abstract
The invention discloses a control method of construction errors in stage construction of a long-span long-section continuous beam, which comprises the following steps: step one, collecting the cross section size, the elastic modulus and the load value of a designed theory; secondly, collecting geological parameters, simulating a construction process, adjusting the position, the elevation and the section size of a support under the premise of ensuring that the shape of a finished bridge is consistent with the designed shape of the finished bridge, so that the elastic modulus and the load value are within an error threshold, and calculating to obtain the theoretical position, the elevation and the section size at the moment; thirdly, building supports at two ends, and measuring various parameter values; step four, calculating various parameter values of the middle support at the moment; step five, building one of the middle supports, and measuring various parameter values; calculating to obtain various parameter values of the rest intermediate supports at the moment; and step seven, repeating the step five to the step six until all the intermediate supports are built. The invention has the advantages of eliminating the errors formed by the previous construction step in sequence and improving the quality of the finished bridge.
Description
Technical Field
The invention relates to the field of construction error control. More specifically, the invention relates to a control method for construction errors in the stage construction of a long-span long-section continuous beam.
Background
With the development of prestressed concrete technology and the application of high-strength materials and high-performance concrete in bridge engineering, continuous box girders are gradually developed towards large span. For a long-span continuous beam, various construction error factors must be effectively eliminated, the influence on the operation quality and the appearance quality of the bridge is reduced, and the internal force state and the geometric linear shape of the bridge are maximally close to the original design target. And in the construction process, the stress and deformation of each stage are ensured to meet the design requirements as much as possible, and the bridge forming quality is ensured.
However, at present, few researches on the control problem of the beam body stress and deformation in the construction stage of the large-span long-section continuous beam are carried out, and therefore, how to control the construction error in the construction stage of the large-span long-section continuous beam is worth researching.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
The invention also aims to provide a control method of construction errors in the stage construction of the long-span long-section continuous beam, which can ensure that the shape of the formed bridge is consistent with the design state on the whole, eliminate errors formed in the previous construction and improve the quality of the formed bridge.
To achieve these objects and other advantages in accordance with the present invention, there is provided a method for controlling construction errors in the stage construction of a long-span long-gauge section continuous beam, comprising:
step one, acquiring theoretical section size, elastic modulus and load value of supports at two ends and a middle support of a designed continuous beam according to a designed bridge shape;
secondly, collecting geological parameters of a construction site, simulating the construction process of the supports at the two ends and the middle support, adjusting the positions, the elevations and the section sizes of the supports at the two ends and the middle support on the premise of ensuring that the shape of the formed bridge is consistent with the designed shape of the formed bridge, so that the difference values of the elastic modulus and the load value of the supports at the two ends and the middle support and the theoretical data designed in the first step are within an error threshold, and calculating to obtain the theoretical positions, the elevations and the section sizes of the supports at the two ends and the middle support at the moment;
thirdly, constructing the supports at the two ends on a construction site according to the positions, the elevations and the section sizes of the supports at the two ends obtained by calculation in the second step, and measuring the positions, the elevations, the section sizes, the elastic moduli and the load values of the supports at the two ends formed actually after the concrete reaches the preset strength;
fourthly, collecting geological parameters of a construction site, simulating a construction process by using actual measured values of supports at two ends, adjusting the position, the elevation and the section size of the middle support on the premise of ensuring that the shape of a finished bridge is consistent with the designed shape of the finished bridge, so that the difference value between the elastic modulus and the load value of the middle support and the theoretical data designed in the first step is within an error threshold, and calculating to obtain the theoretical position, the elevation and the section size of the middle support at the moment;
step five, building one of the intermediate supports according to the position, the elevation and the section size of the intermediate support obtained by calculation in the step four, and measuring the position, the elevation, the elastic modulus, the section size and the load value of the actually formed intermediate support after the concrete reaches the preset strength;
collecting geological parameters of a construction site, simulating a construction process by using actual measured values of supports at two ends and a built middle support, adjusting the positions, elevations and section sizes of the rest of middle supports on the premise of ensuring that the shape of a finished bridge is consistent with the designed shape of the finished bridge, so that the difference values of the elastic modulus and the load data of the rest of middle supports and the theoretical data designed in the step one are within an error threshold, and calculating to obtain the theoretical positions, the elevations and the section sizes of the rest of middle supports at the moment;
and step seven, repeating the step five to the step six until all the intermediate supports are constructed, and finishing the construction of the continuous beam stage.
Preferably, if the load value of the middle support is lower than the theoretical load value designed in the first step, a corresponding middle support and a bearing platform tension and compression rod model of two supports adjacent to the middle support are established, the force transmission direction and the force transmission size of the tension and compression rod model are calculated, the positions of a fixed tension rod, a compression rod and a node are determined according to the force transmission direction and the force transmission size and corresponding theoretical data designed in the first step, a reinforced force transmission model is formed, and the corresponding support is reinforced on a construction site according to the force transmission model.
Preferably, before the supports at the two ends and the middle support are built, a construction site with the same geological parameters is selected, the average sizes of the supports at the two ends and the middle support are selected, after a main beam is poured, multi-cylindrical reference objects are arranged on the side surface of the main beam at intervals, the descending value of the reference objects is detected after concrete reaches preset strength, then after a pier is poured, a plurality of cylindrical reference objects are arranged on the side surface of the pier, after the concrete reaches the preset strength, the descending value of the reference objects is detected, and the section size of the main beam, the settlement relation between the height of the main beam and the concrete, and the settlement relation between the section size of the pier, the height of the pier and the concrete;
and calculating theoretical concrete pouring amount of the main beam and the bridge pier during construction of each support according to the settlement relationship among the section size of the main beam, the height of the main beam and the concrete and the settlement relationship among the section size of the bridge pier, the height of the bridge pier and the concrete.
Preferably, after the main beam further comprising the support stands on the mold, applying lateral pressure to each surface of the standing mold, detecting the deformed shape of the standing mold, simulating the shape of the main beam according to the deformed shape of the standing mold, calculating the section size and the load value of the main beam, and if the section size and the load value of the main beam are not within the error threshold, adjusting the standing mold until the simulated section size and the simulated load value of the main beam are within the error threshold.
Preferably, the construction method further comprises the steps of simultaneously constructing supports at two ends, erecting a mold according to the elevation, simultaneously pouring the main beams of the supports at the two ends, measuring the load value of the main beam after the concrete reaches the preset strength, if one of the load values is not within the error threshold, constructing a construction model of the pier of the supports at the two ends on the basis of the load value of the actual main beam, calculating the position, the section size and the load value of the pier on the premise of ensuring that the load values of the supports at the two ends are within the error threshold, and constructing the pier according to the calculated position and the section size of the pier.
Preferably, the middle support located in the middle of the two end supports is constructed first, and if the number of the middle supports is an even number, the two middle supports located in the middle of the two end supports are constructed first.
The invention at least comprises the following beneficial effects:
firstly, by taking the designed bridge shape as a reference and taking geological parameters of a construction site as a basis, supports at two ends are built firstly, the bridge shape can be ensured to be consistent with the design state on the whole, then the construction process is simulated once by building each support, and the adjustment is carried out to eliminate the error formed by the previous construction, so that the probability that the actual bridge shape is consistent with the design shape is improved, in addition, in the adjustment process, the cross section size, the elastic modulus and the load value are taken as parameters, the consistency of various internal stresses after the bridge formation and the design value can be ensured, and the bridge formation quality is improved.
And secondly, constructing the supports at the two ends, and positioning the continuous beam on the whole, so that the consistency of the actual bridge forming shape and the design shape can be improved.
Thirdly, adjusting the middle support by simulating the construction process again according to various parameters of the supports at the two actual ends so as to eliminate the error formed by the actual construction of the supports at the two ends and achieve the effect of reducing the whole error.
Fourthly, according to various parameters of the supports at the two ends and the constructed middle support, the middle support which is not constructed is adjusted by simulating the construction process so as to eliminate the error formed by the constructed support and achieve the effect of reducing the whole error.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is described in further detail below to enable those skilled in the art to practice the invention with reference to the description.
The invention provides a control method of construction errors in stage construction of a long-span long-section continuous beam, which comprises the following steps:
step one, acquiring theoretical section size, elastic modulus and load value of supports at two ends and a middle support of a designed continuous beam according to a designed bridge shape; the designed bridge-forming shape is an optimal state obtained by field test of geological conditions, various stress analyses according to terrain and topography and integration, so that the bridge-forming shape is ensured to be consistent with the designed shape in the construction process, and the bridge-forming quality can be effectively ensured. The three parameters of section size, elastic modulus and load value can ensure the stress of the bridge.
Secondly, collecting geological parameters of a construction site, simulating the construction process of the supports at the two ends and the middle support, adjusting the positions, the elevations and the section sizes of the supports at the two ends and the middle support on the premise of ensuring that the shape of the formed bridge is consistent with the designed shape of the formed bridge, so that the difference values of the elastic modulus and the load value of the supports at the two ends and the middle support and the theoretical data designed in the first step are within an error threshold, and calculating to obtain the theoretical positions, the elevations and the section sizes of the supports at the two ends and the middle support at the moment; due to the fact that the geological parameters can be changed due to the fact that the local positions of the construction site are different, the construction process is simulated according to specific parameters before construction, ideal construction parameters can be obtained more accurately, and construction errors are reduced.
Thirdly, constructing the supports at the two ends on a construction site according to the positions, the elevations and the section sizes of the supports at the two ends obtained by calculation in the second step, and measuring the positions, the elevations, the section sizes, the elastic moduli and the load values of the supports at the two ends formed actually after the concrete reaches the preset strength; the supports at the two ends are constructed firstly, and the continuous beam is positioned on the whole, so that the consistency of the actual formed bridge shape and the designed shape can be improved.
Fourthly, collecting geological parameters of a construction site, simulating a construction process by using actual measured values of supports at two ends, adjusting the position, the elevation and the section size of the middle support on the premise of ensuring that the shape of a finished bridge is consistent with the designed shape of the finished bridge, so that the difference value between the elastic modulus and the load value of the middle support and the theoretical data designed in the first step is within an error threshold, and calculating to obtain the theoretical position, the elevation and the section size of the middle support at the moment; according to various parameters of the supports at the two actual ends, the middle support is adjusted through the simulation construction process again, so that errors formed by actual construction of the supports at the two ends are eliminated, and the effect of reducing the overall errors is achieved.
Step five, building one of the intermediate supports according to the position, the elevation and the section size of the intermediate support obtained by calculation in the step four, and measuring the position, the elevation, the elastic modulus, the section size and the load value of the actually formed intermediate support after the concrete reaches the preset strength;
collecting geological parameters of a construction site, simulating a construction process by using actual measured values of supports at two ends and a built middle support, adjusting the positions, elevations and section sizes of the rest of middle supports on the premise of ensuring that the shape of a finished bridge is consistent with the designed shape of the finished bridge, so that the difference values of the elastic modulus and the load data of the rest of middle supports and the theoretical data designed in the step one are within an error threshold, and calculating to obtain the theoretical positions, the elevations and the section sizes of the rest of middle supports at the moment; according to various parameters of actual supports at two ends and constructed intermediate supports, the intermediate supports which are not constructed are adjusted by simulating the construction process so as to eliminate errors formed by the constructed supports and achieve the effect of reducing the overall errors.
And step seven, repeating the step five to the step six until all the intermediate supports are constructed, and finishing the construction of the continuous beam stage.
In the technical scheme, the designed bridge shape is taken as a reference, construction site geological parameters are taken as a basis, the supports at the two ends are built firstly, the bridge shape can be ensured to be consistent with the design state on the whole, then the construction process is simulated once by building each support, and the adjustment is carried out, so that the error formed in the previous construction step is eliminated, the probability that the actual bridge shape is consistent with the design shape is improved, in addition, the cross section size, the elastic modulus and the load value are taken as parameters in the adjustment process, the consistency of various internal stresses after the bridge formation and the design values can be ensured, and the bridge formation quality is improved.
In another technical scheme, if the load value of the middle support is lower than the theoretical load value designed in the first step, a corresponding middle support and a bearing platform pull-press rod model of two supports adjacent to the middle support are established, the force transmission direction and the force transmission size of the pull-press rod model are calculated, the positions of a fixed pull rod, a press rod and a node are determined according to the force transmission direction and the force transmission size and corresponding theoretical data designed in the first step, a reinforced force transmission model is formed, and the corresponding support is reinforced on a construction site according to the force transmission model. When the load value does not reach the standard after a certain intermediate support is constructed, the intermediate support can be reinforced and adjusted in time, load errors are eliminated, distribution of the stress installation value of the intermediate support is guaranteed, and construction quality is guaranteed.
In another technical scheme, before two end supports and a middle support are built, a construction site with the same geological parameters is selected, the average sizes of the two end supports and the middle support are selected, after a main beam is poured, multi-cylindrical reference objects are arranged on the side surface of the main beam at intervals, the descending value of the reference objects is detected after concrete reaches preset strength, then a pier is poured, a plurality of cylindrical reference objects are arranged on the side surface of the pier, after the concrete reaches the preset strength, the descending value of the reference objects is detected, and the section size of the main beam, the sedimentation relation between the height of the main beam and the concrete, and the section size of the pier, the sedimentation relation between the height of the pier and the concrete are calculated;
and calculating theoretical concrete pouring amount of the main beam and the bridge pier during construction of each support according to the settlement relationship among the section size of the main beam, the height of the main beam and the concrete and the settlement relationship among the section size of the bridge pier, the height of the bridge pier and the concrete. The settlement degree of the concrete is related to the section size and height of the main beam and the pier and the performance of the concrete, so that the concrete for construction of the project is obtained by adopting actual measurement, the main beam and pier parameters required by the project are calculated to obtain the settlement relation, the concrete settlement amount of each support in actual construction can be more accurately predicted, and quality assurance is provided for construction of the supports.
In another technical scheme, after a main beam of the support is erected, lateral pressure to the upright die is applied to each surface of the upright die, the deformed shape of the upright die is detected, the shape of the main beam is simulated according to the deformed shape of the upright die, the section size and the load value of the main beam are calculated, and if the section size and the load value of the main beam are not within an error threshold, the upright die is adjusted until the simulated section size and the simulated load value of the main beam are within the error threshold. After the girder founds the mould, only simply detect and found the mould shape, the reaction that can not be accurate actually becomes the roof beam, becomes the shape of pier, and the pressure to founding the mould survey face after the simulation concrete placement detects the shape again, can more accurate reaction become the shape that the roof beam becomes the pier, improves the construction precision of girder and pier, reduces construction error.
In another technical scheme, the construction method further comprises the steps of simultaneously building supports at two ends, erecting a mold according to the elevation, simultaneously pouring the main beams of the supports at the two ends, measuring the load value of the main beam after the concrete reaches the preset strength, if one of the load values is not within the error threshold, constructing a construction model of the pier of the supports at the two ends on the basis of the load value of the actual main beam, calculating the position, the section size and the load value of the pier on the premise of ensuring that the load values of the supports at the two ends are within the error threshold, and building the pier according to the calculated position and the section size of the pier. The supports at the two ends are used for integrally controlling the supports in the shape of a bridge, so that a main beam is respectively built at the same time, and a pier is built after actual measurement and adjustment, so that the construction error of the main beam is eliminated, and the integral construction precision of the supports at the two ends can be improved.
In another technical scheme, an intermediate support positioned in the middle of the supports at the two ends is firstly built, and if the number of the intermediate supports is an even number, two intermediate supports positioned in the middle of the supports at the two ends are firstly and simultaneously built. The stress of the middle position is weakest, so that the construction error of the middle position can be eliminated, and the construction quality of the middle support can be ensured to the maximum extent.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the examples shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (6)
1. The control method of construction errors in the stage construction of the long-span long-section continuous beam is characterized by comprising the following steps of:
step one, acquiring theoretical section size, elastic modulus and load value of supports at two ends and a middle support of a designed continuous beam according to a designed bridge shape;
secondly, collecting geological parameters of a construction site, simulating the construction process of the supports at the two ends and the middle support, adjusting the positions, the elevations and the section sizes of the supports at the two ends and the middle support on the premise of ensuring that the shape of the formed bridge is consistent with the designed shape of the formed bridge, so that the difference values of the elastic modulus and the load value of the supports at the two ends and the middle support and the theoretical data designed in the first step are within an error threshold, and calculating to obtain the theoretical positions, the elevations and the section sizes of the supports at the two ends and the middle support at the moment;
thirdly, constructing the supports at the two ends on a construction site according to the positions, the elevations and the section sizes of the supports at the two ends obtained by calculation in the second step, and measuring the positions, the elevations, the section sizes, the elastic moduli and the load values of the supports at the two ends formed actually after the concrete reaches the preset strength;
fourthly, collecting geological parameters of a construction site, simulating a construction process by using actual measured values of supports at two ends, adjusting the position, the elevation and the section size of the middle support on the premise of ensuring that the shape of a finished bridge is consistent with the designed shape of the finished bridge, so that the difference value between the elastic modulus and the load value of the middle support and the theoretical data designed in the first step is within an error threshold, and calculating to obtain the theoretical position, the elevation and the section size of the middle support at the moment;
step five, building one of the intermediate supports according to the position, the elevation and the section size of the intermediate support obtained by calculation in the step four, and measuring the position, the elevation, the elastic modulus, the section size and the load value of the actually formed intermediate support after the concrete reaches the preset strength;
collecting geological parameters of a construction site, simulating a construction process by using actual measured values of supports at two ends and a built middle support, adjusting the positions, elevations and section sizes of the rest of middle supports on the premise of ensuring that the shape of a finished bridge is consistent with the designed shape of the finished bridge, so that the difference values of the elastic modulus and the load data of the rest of middle supports and the theoretical data designed in the step one are within an error threshold, and calculating to obtain the theoretical positions, the elevations and the section sizes of the rest of middle supports at the moment;
and step seven, repeating the step five to the step six until all the intermediate supports are constructed, and finishing the construction of the continuous beam stage.
2. The method for controlling the construction errors in the stage construction of the long-span long-size section continuous beam according to claim 1, further comprising the steps of establishing corresponding intermediate supports and bearing platform tension and compression rod models of the two supports adjacent to the intermediate supports if the load value of the intermediate supports is lower than the theoretical load value designed in the step one, calculating the force transmission direction and the force transmission size of the tension and compression rod models, determining the positions of a fixed tension rod, a compression rod and a node according to the force transmission direction and the force transmission size and the corresponding theoretical data designed in the step one, forming a reinforced force transmission model, and reinforcing the corresponding supports on a construction site according to the force transmission model.
3. The method for controlling the construction error in the stage construction of the long-span long-size-section continuous beam according to claim 1, wherein before the supports at the two ends and the middle support are built, a construction site with the same geological parameters is selected, the average sizes of the supports at the two ends and the middle support are selected, after a main beam is poured, a plurality of cylindrical reference objects are arranged on the side surface of the main beam at intervals, after the concrete reaches the preset strength, the descending value of the reference objects is detected, then after a pier is poured, a plurality of cylindrical reference objects are arranged on the side surface of the pier, after the concrete reaches the preset strength, the descending value of the reference objects is detected, and the section size of the main beam, the height of the main beam and the settlement relation of the concrete, the section size of the pier, the height of the pier;
and calculating theoretical concrete pouring amount of the main beam and the bridge pier during construction of each support according to the settlement relationship among the section size of the main beam, the height of the main beam and the concrete and the settlement relationship among the section size of the bridge pier, the height of the bridge pier and the concrete.
4. The method for controlling the construction error in the stage construction of the long-span long-size-section continuous beam according to claim 1, further comprising the steps of exerting lateral pressure on each surface of a vertical mold after the vertical mold of the main beam of the support is erected, detecting the deformed shape of the vertical mold, simulating the shape of the main beam according to the deformed shape of the vertical mold, calculating the section size and the load value of the main beam, and adjusting the vertical mold if the section size and the load value of the simulated main beam are not within the error threshold.
5. The method for controlling the construction error in the stage construction of the long-span long-size section continuous beam according to claim 1, further comprising the steps of simultaneously constructing supports at two ends, erecting a mold according to the elevation, simultaneously pouring main beams with the supports at the two ends, measuring load values of the main beams after concrete reaches a preset strength, if one of the main beams is not within an error threshold, constructing a construction model of the pier with the supports at the two ends based on the load values of the actual main beams, calculating to obtain the position, the section size and the load values of the pier on the premise of ensuring that the load values of the supports at the two ends are within the error threshold, and constructing the pier according to the calculated position and the section size of the pier.
6. The method for controlling construction errors in the stage construction of the long-span long-number-section continuous beam according to claim 1, wherein the intermediate supports located in the middle of the two end supports are constructed first, and if the number of the intermediate supports is an even number, the two intermediate supports located in the middle of the two end supports are constructed simultaneously first.
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| JPH08151605A (en) * | 1994-11-30 | 1996-06-11 | Kajima Corp | Manufacture of precast block for bridge and its device |
| CN102747679A (en) * | 2012-06-19 | 2012-10-24 | 同济大学 | Economic arrangement method for inhaul cable shock mounts of continuous girder bridge |
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