CN114525740A - Safety early warning method for steel box girder pushing process - Google Patents
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- CN114525740A CN114525740A CN202210223014.4A CN202210223014A CN114525740A CN 114525740 A CN114525740 A CN 114525740A CN 202210223014 A CN202210223014 A CN 202210223014A CN 114525740 A CN114525740 A CN 114525740A
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- 238000004458 analytical method Methods 0.000 claims description 9
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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
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
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Abstract
The invention discloses a safety early warning method for a steel box girder pushing process. Belongs to the field of bridge engineering, and specifically comprises the following steps: arranging a stress sensor and marking linear acquisition points on the steel box girder, and acquiring data of the stress sensor and the marking linear acquisition points as initial values; starting an equipment controller to perform pushing and acquire stress and linear data; subtracting the initial values of the stress and the linear shape from the stress and linear shape data; comparing the stress acquisition value of the steel box girder with a theoretical calculation result, and taking the deviation +/-10% of the stress acquisition value and the theoretical calculation result as a stress safety early warning limit; comparing the linear shape value of the steel box girder with a theoretical calculation linear shape result, and taking the deviation of the linear shape value and the theoretical calculation linear shape result of the steel box girder to be +/-1 cm as a linear safety early warning limit; when the stress safety early warning limit is reached, the pushing is stopped, and the pushing is continued after the reason is found; when the linear safety early warning limit is reached and the stress safety early warning limit is not reached, the pushing is continued, and the deviation correction adjustment is performed step by step in a mode of adjusting the jacking force of each jacking point. The method has the advantages of clear control standard, easiness in realization and capability of guaranteeing the structural safety in the pushing process of steel box girder construction.
Description
Technical Field
The invention belongs to the field of bridge engineering, relates to a safety early warning method for a steel box girder pushing process, and particularly relates to a safety early warning method for a steel box girder pushing process with stress control as a main linear control as an auxiliary control.
Background
Due to the fact that the pushing construction technology is high in construction speed and small in influence on existing traffic, the pushing construction technology is widely applied to the construction process of the steel box girder in recent years. In the pushing process of the steel box girder, the boundary condition and the load condition of the bridge are continuously changed in the whole pushing process, so that the stress and the line shape of the steel box girder are also in the continuously changing process. In order to ensure the safety of the steel box girder structure and ensure that the structural internal force and the line shape of the steel box girder after the bridge formation meet the design requirements in the steel box girder pushing construction process, the stress and the line shape in the steel box girder pushing process must be monitored.
The stress and linear control standard when the steel box girder bridge forms the bridge is given in the technical specification of highway bridge and culvert construction (JTG/T3650-. The structural safety of the steel box girder is also of great importance in the construction process, unsafe factors in the process directly influence the safety of the whole project, and potential safety hazards in the process are discovered and are of great importance to solve the problems as soon as possible, so that the safety early warning method in the steel box girder pushing process is clear, the safety of the pushing construction process is guaranteed, the requirement is met when the steel box girder is formed into a bridge, and the method has great significance.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a safety early warning method for a steel box girder pushing process by taking stress control as an auxiliary main linear control, which carries out safety early warning on the steel box girder pushing construction process according to a clear and controllable standard.
The technical scheme is as follows: the invention relates to a safety early warning method for a steel box girder pushing process, which comprises the following specific operation steps:
(1) stress sensors are arranged at the tail part, 1/4 span, midspan and front end of the steel box girder and are used for collecting the stress of the steel box girder with different sections in the pushing process of the steel box girder; the positions of the stress sensors are the tail part, 1/4 span, span and front end of the steel box girder, and the stress conditions of the tail part, 1/4 span, span and front end of the steel box girder are analyzed and focused on based on theoretical calculation and analysis, and the stress sensor arrangement positions can be set according to other engineering conditions;
(2) marking linear collection points at every 5m of the top surface of the steel box girder longitudinally and every web plate transversely; the positions of the linear acquisition points are 5m at intervals in the longitudinal direction of the top surface of the steel box girder, and the positions of the transverse webs are analyzed, so that the deformation conditions of the positions of the transverse webs at intervals of 5m in the longitudinal direction of the top surface of the steel box girder are analyzed and focused on based on theoretical calculation and analysis, and the positions of the linear acquisition points can be set according to other engineering conditions;
(3) after the stress sensor and the linear acquisition point are arranged in place, acquiring stress and linear data of the stress sensor and the linear acquisition point, and taking the acquired data as initial values;
(4) starting a controller of the steel box girder pushing equipment to start a steel box girder pushing process, and collecting stress and linear data in the steel box girder pushing process;
(5) subtracting the initial values of the stress and the linear shape acquired in the step (3) from the stress and linear shape data acquired in the step (4) in the pushing process to obtain the stress and the linear shape of the current steel box girder (namely the acquired value of the stress and the linear shape value of the current steel box girder); the stress and the line shape of the current steel box girder are the positions where the steel box girder is pushed at the moment of collecting the stress and the line shape;
(6) comparing the stress collection value of the steel box girder with a theoretical calculation result, and taking the deviation between the collection value and the theoretical calculation result of +/-10% as a stress safety early warning limit; the theoretical calculation result is theoretical data calculated by adopting bridge calculation analysis software according to the bridge structure condition and the pushing working condition;
(7) comparing the linear shape value of the steel box girder with a theoretical calculation linear shape result, and taking the deviation between the acquired value and the theoretical calculation result of +/-1 cm as a linear safety early warning limit; the theoretical calculation result is theoretical data calculated by adopting bridge calculation analysis software according to the bridge structure condition and the pushing working condition;
(8) when the stress safety early warning limit in the step (6) is reached, the pushing process is immediately stopped, and pushing can be continued after the reason is searched for and treated; and (4) when the linear safety early warning limit in the step (7) is reached but the stress safety early warning limit in the step (6) is not reached, the jacking process is not required to be stopped, and the gradual deviation rectification adjustment is carried out in a mode of adjusting the jacking force of each jacking point.
Has the advantages that: compared with the prior art, the invention has the characteristics that: 1. in the invention, the positions of the stress sensors are the tail part, 1/4 span, span and front end of the steel box girder, the stress sensor arrangement positions can be set according to other engineering conditions, and the safety early warning method is not limited by the arrangement positions and has universal applicability; 2. in the invention, the positions of the linear acquisition points are 5m at intervals in the longitudinal direction of the top surface of the steel box girder and each web plate in the transverse direction, and the safety early warning method is not limited by the arrangement position and has universal applicability; 3. in the invention, the stress sensor and the linear acquisition equipment have a stress acquisition function and a linear acquisition function, and the test method is not limited by the brand and model of the equipment and has universal applicability; 4. in the invention, the theoretical calculation result is theoretical data calculated by adopting bridge calculation analysis software according to the bridge structure condition and the pushing working condition, and the test method is not limited by the brand and model of the bridge calculation analysis software and has universal applicability; 5. the invention provides a clear safety early warning method in the pushing process of a steel box girder, which comprises the following steps: when the stress safety early warning limit in the step (6) is reached, the pushing process is immediately stopped, and pushing can be continued after the reason is searched for and treated; when the linear safety early warning limit in the step (7) is reached but the stress safety early warning limit in the step (6) is not reached, the jacking process does not need to be stopped, and the gradual deviation correction adjustment is carried out in a mode of adjusting the jacking force of each jacking point; 6. the method has the advantages of clear safety early warning standard, easy realization, easy mastering, application and popularization and guarantee of safety in the steel box girder pushing construction process.
Drawings
FIG. 1 is a flow chart of the operation of the present invention;
FIG. 2 is a schematic diagram of the arrangement position of a steel box girder stress sensor in the invention;
FIG. 3 is a schematic diagram of the arrangement position of the linear collection points of the steel box girder in the invention;
FIG. 4 is a diagram of a theoretical calculation analysis model of the steel box girder according to the present invention;
FIG. 5 is a safety early warning comparison graph of stress monitoring data of the steel box girder in the invention;
FIG. 6 is a comparison graph of the safety pre-warning of the linear monitoring data of the steel box girder in the invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in FIG. 1, the safety early warning method for the pushing process of the steel box girder comprises the following specific operation steps:
(1) stress sensors are arranged at the tail part, 1/4 span, midspan and front end of the steel box girder and are used for collecting the stress of the steel box girder with different sections in the pushing process of the steel box girder; the positions of the stress sensors are the tail part, 1/4 span, span and front end of the steel box girder, and the stress conditions of the tail part, 1/4 span, span and front end of the steel box girder are analyzed and focused on based on theoretical calculation and analysis, and the stress sensor arrangement positions can be set according to other engineering conditions;
(2) marking linear collection points at every 5m of the top surface of the steel box girder longitudinally and every web plate transversely; the positions of the linear acquisition points are 5m at intervals in the longitudinal direction of the top surface of the steel box girder, and the positions of the transverse webs are analyzed, so that the deformation conditions of the positions of the transverse webs at intervals of 5m in the longitudinal direction of the top surface of the steel box girder are analyzed and focused on based on theoretical calculation and analysis, and the positions of the linear acquisition points can be set according to other engineering conditions;
(3) after the stress sensor and the linear acquisition point are arranged in place, acquiring stress and linear data of the stress sensor and the linear acquisition point, and taking the acquired data as initial values;
(4) starting a controller of the steel box girder pushing equipment to start a steel box girder pushing process, and collecting stress and linear data in the steel box girder pushing process;
(5) subtracting the initial values of the stress and the linear shape acquired in the step (3) from the stress and linear shape data acquired in the step (4) in the pushing process to obtain the stress and the linear shape of the current steel box girder (namely the acquired value of the stress and the linear shape value of the current steel box girder); the stress and the line shape of the current steel box girder are the positions where the steel box girder is pushed at the moment of collecting the stress and the line shape;
(6) comparing the stress collection value of the steel box girder with a theoretical calculation result, and taking the deviation between the collection value and the theoretical calculation result of +/-10% as a stress safety early warning limit; the theoretical calculation result is theoretical data calculated by adopting bridge calculation analysis software according to the bridge structure condition and the pushing working condition;
(7) comparing the linear shape value of the steel box girder with a theoretical calculation linear shape result, and taking the deviation between the acquired value and the theoretical calculation result of +/-1 cm as a linear safety early warning limit; the theoretical calculation result is theoretical data calculated by adopting bridge calculation analysis software according to the bridge structure condition and the pushing working condition;
(8) when the stress safety early warning limit in the step (6) is reached, the pushing process is immediately stopped, and pushing can be continued after the reason is searched for and treated; and (4) when the linear safety early warning limit in the step (7) is reached but the stress safety early warning limit in the step (6) is not reached, the jacking process is not required to be stopped, and the gradual deviation rectification adjustment is carried out in a mode of adjusting the jacking force of each jacking point.
Examples
A method for monitoring real-time dynamic deflection of a steel box girder in a walking pushing process based on a zero displacement datum point comprises the following operation steps:
(1) stress sensors are arranged at the tail part, 1/4 span, midspan and front end of the steel box girder and are used for collecting the stress of the steel box girder with different sections in the pushing process of the steel box girder; as shown in fig. 2, the arrangement positions of the steel box girder stress sensors are 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 and 18 in the schematic diagram;
(2) marking linear collection points at every 5m of the top surface of the steel box girder longitudinally and every web plate transversely; as shown in fig. 3, the linear collection points of the steel box girder are marked in the schematic layout;
(3) after the stress sensor and the linear acquisition point are arranged in place, acquiring stress and linear data as initial values;
(4) starting a controller of the steel box girder pushing equipment, starting a steel box girder pushing process, and collecting stress and linear data;
(5) subtracting the initial values of the stress and the linear shape acquired in the step (3) from the stress and linear shape data acquired in the step (4) in the pushing process to obtain the stress and linear shape of the current steel box girder;
(6) comparing the stress collection value of the steel box girder with a theoretical calculation result, and taking the deviation between the collection value and the theoretical calculation result of +/-10% as a stress safety early warning limit; as shown in fig. 4, a theoretical calculation analysis model of the steel box girder;
(7) comparing the linear shape value of the steel box girder with a theoretical calculation linear shape result, and taking the deviation between the acquired value and the theoretical calculation result of +/-1 cm as a linear safety early warning limit; as shown in fig. 5, a theoretical calculation analysis model of the steel box girder;
(8) when the stress safety early warning limit in the step (6) is reached, the pushing process is immediately stopped, and pushing can be continued after the reason is searched for and treated; when the linear safety early warning limit in the step (7) is reached but the stress safety early warning limit in the step (6) is not reached, the jacking process does not need to be stopped, and the gradual deviation correction adjustment is carried out in a mode of adjusting the jacking force of each jacking point; as shown in fig. 5, the safety pre-warning of the stress monitoring data of the steel box girder and the safety pre-warning of the linear monitoring data of the steel box girder are shown in fig. 6.
It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (6)
1. A safety early warning method for a steel box girder pushing process is characterized by comprising the following specific operation steps:
(1) stress sensors are arranged at the tail part, 1/4 span, midspan and front end of the steel box girder; marking linear collection points at every 5m of the top surface of the steel box girder longitudinally and every web plate transversely;
(2) after the stress sensor and the linear acquisition point are arranged in place, acquiring stress and linear data of the stress sensor and the linear acquisition point, and taking the acquired data as initial values;
(3) starting a controller of the steel box girder pushing equipment to start a steel box girder pushing process, and collecting stress and linear data in the steel box girder pushing process;
(4) subtracting the initial values of the stress and the linear shape collected in the step (2) from the stress and linear shape data collected in the pushing process in the step (3) to obtain the collected value of the stress and the linear shape value of the current steel box girder;
(5) comparing the current collected value of the stress of the steel box girder with a theoretical calculation result, and taking the deviation between the collected value and the theoretical calculation result of +/-10% as a stress safety early warning limit;
(6) comparing the linear shape value of the current steel box girder with a theoretical calculation linear shape result, and taking the deviation between the acquired value and the theoretical calculation result of +/-1 cm as a linear safety early warning limit;
(7) when the stress safety early warning limit in the step (6) is reached, stopping the pushing process, searching the reason and continuing pushing after treatment;
and (4) when the linear safety early warning limit in the step (6) is reached but the stress safety early warning limit in the step (6) is not reached, continuing the pushing process, and performing gradual deviation rectification adjustment in a mode of adjusting the jacking force of each jacking point.
2. The steel box girder pushing process safety early warning method according to claim 1,
in the step (1), stress sensors are arranged at the tail, 1/4 span, span and front end of the steel box girder, and are used for analyzing the stress condition of the tail, 1/4 span, span and front end of the steel box girder based on theoretical calculation analysis.
3. The steel box girder pushing process safety early warning method according to claim 1,
in the step (1), marking the linear acquisition points at every 5m of longitudinal intervals and every 5m of transverse web positions on the top surface of the steel box girder is based on theoretical calculation analysis and is used for analyzing the deformation condition of every 5m of longitudinal intervals and every transverse web positions on the top surface of the steel box girder.
4. The steel box girder pushing process safety early warning method according to claim 1,
in the step (4), the obtained stress and line shape of the current steel box girder are positions where the steel box girder is pushed at the moment of collecting the stress and line shape.
5. The steel box girder pushing process safety early warning method according to claim 1,
in the step (5), the theoretical calculation result is theoretical data calculated by adopting bridge calculation analysis software according to the bridge structure condition and the pushing working condition.
6. The steel box girder pushing process safety early warning method according to claim 1,
in the step (6), the theoretical calculation result is theoretical data calculated by adopting bridge calculation analysis software according to the bridge structure condition and the pushing working condition.
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Cited By (1)
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Application publication date: 20220524 |