CN-122020802-A - Large-span bridge construction monitoring method

CN122020802ACN 122020802 ACN122020802 ACN 122020802ACN-122020802-A

Abstract

The invention discloses a large-span bridge construction monitoring method, which is applied to the technical field of construction control. The method comprises the steps of obtaining sensor monitoring data of bridge sections in the current construction stage, preprocessing the sensor monitoring data, calculating structural displacement and stress state of the bridge sections under the action of dead weight, prestress, concrete shrinkage creep and temperature change according to the preprocessed data, obtaining the structural displacement and stress state of the bridge sections in the construction stage, determining the vertical model elevation of the bridge structure in the construction stage through reverse analysis according to the calculated structural displacement and stress state of the bridge sections, and correcting the difference value between the vertical model elevation and a predicted value, so that construction of the bridge sections is monitored. The construction monitoring method can avoid the deviation of internal force and displacement of each stage from design values along with the change of the concrete pouring process, improve the safety of the structure in the construction process, ensure the construction safety and quality, and ensure that the bridge construction state meets the design requirements.

Inventors

YAN FENG
LUO ZHIWEI
LI CHENG
BI ZHANGLONG
SHEN JIE
LIU QIANG
YANG WEIFENG
ZHANG HUAMING
LV HUITAO
HU XIAORONG
JIN PENG
YIN WENYAN
ZHAO BIN
CHEN QINGYUN

Assignees

中铁一局集团第八工程有限公司
中铁一局集团有限公司
中铁一局集团桥梁工程有限公司

Dates

Publication Date: 20260512
Application Date: 20260212

Claims (8)

1. The large-span bridge construction monitoring method is characterized by comprising the following steps of: Acquiring sensor monitoring data of each bridge segment in the current construction stage; Preprocessing the sensor monitoring data to obtain preprocessed data; calculating the structural displacement and the stress state of each bridge segment under the actions of dead weight, prestress, concrete shrinkage creep and temperature change according to the obtained pretreatment data, and obtaining the structural displacement and the stress state of each construction stage; determining the vertical formwork elevation of the bridge structure at each construction stage through backward analysis according to the calculated structural displacement and stress state at each construction stage; And comparing the obtained vertical model elevation and the predicted value of the bridge structure at each construction stage, and correcting the difference value between the vertical model elevation and the predicted value, thereby monitoring the construction of each bridge segment.
2. The method for monitoring the construction of the large-span bridge according to claim 1, wherein, The monitoring data comprises arch rib deformation, girder deformation and hanger rod cable force.
3. The method for monitoring the construction of the large-span bridge according to claim 1, wherein, The sensor monitoring data are acquired by a plurality of sensors arranged on each bridge section.
4. A method for monitoring construction of a large-span bridge according to claim 3, The sensors include, but are not limited to, strain-type force sensors, fiber optic sensors, piezoelectric sensors, steel string sensors.
5. The method for monitoring the construction of the large-span bridge according to claim 1, wherein, The reverse analysis specifically comprises the steps that assuming that the internal force distribution of the structure at the bridge forming moment meets the result of the forward analysis moment, the axis meets the design linear requirement, the structure is reversely disassembled according to the reverse process of the forward analysis, the influence of one construction stage on the rest structure is analyzed each time, and the structural displacement and the internal force state obtained by analysis at each stage are the construction state of the structure at each stage.
6. The method for monitoring the construction of the large-span bridge according to claim 1, wherein, Before the step of determining the vertical formwork elevation of the bridge structure at each construction stage by reverse analysis, the method further comprises: determining the actual deformation value of the hanging basket according to the hanging basket pre-pressing test; and determining the pre-camber of the bridge structure according to the hanging basket deformation value and the backward analysis and calculation.
7. The method for monitoring the construction of the large-span bridge according to claim 6, wherein, The specific content of determining the hanging basket deformation value according to the hanging basket pre-pressing test is as follows: The pre-compression test adopts a staged loading method, and the actual deformation value of the hanging basket is calculated through a formula: Wherein, the The elastic deformation value of the hanging basket is used for pouring the nth block piece; 、、 The front ends of the nth bridge sections, the nth bridge section-1 bridge section and the nth bridge section-2 bridge section are shifted after the nth concrete is poured; 、 is the length of the nth and n-1 bridge sections.
8. The method for monitoring the construction of the large-span bridge according to claim 1, wherein, After the step of determining the vertical formwork elevation of the bridge structure at each construction stage by reverse analysis, the method further comprises: Arranging stress measuring points on a plurality of control sections of the bridge, and monitoring stress variation and stress distribution at the plurality of control sections in the construction process; And determining the safety of the bridge formation state according to the stress changes and stress distribution at the plurality of control sections and the calculated vertical mould elevation.

Description

Large-span bridge construction monitoring method Technical Field The invention relates to the technical field of construction control, in particular to a large-span bridge construction monitoring method. Background At present, china is greatly expanding a transportation network, and bridges are important components of the transportation network, namely city bridges, highway bridges and high-speed railway bridges, and continuous beam bridges are widely adopted by virtue of the bridges. In the construction process of the continuous beam bridge adopting the cantilever construction method, the internal force and the line shape of the structure change along with the construction process, and in order to ensure the smooth construction of the bridge, the linearity after the bridge is formed is smooth, the stress is reasonable, and the construction monitoring is necessary. In the construction process of the large-span bridge, for the bridge with the steel pipe concrete structure assembled by few brackets of the bridge-forming arch, the requirements on the bridge-forming arch axiality, the box Liang Nali and the boom tension force are strict, and the distribution of the internal force of the structure can be influenced by the change of the coordinates of each node. Once the bridge line shape deviates from the design value, the internal force tends to deviate from the design value. In addition, the rigidity difference among the components of the structure is large, and the relationship between the force and the deformation is very complex due to the interference of complex factors such as the force of a hanging rod, the temperature change, the influence of wind power and sunlight, the temporary construction load and the like. In construction calculation, although various calculation methods can be adopted to calculate the hanging rod force and the corresponding beam body and arch rib deformation in each construction stage, the actual deformation of the structure can not reach the expected result when the construction is carried out according to the hanging rod force and the linear shape given by theoretical calculation. This is mainly caused by the fact that the calculation parameters adopted in the design, such as modulus of elasticity of materials, weight of members, temperature change in construction, temporary loading conditions in construction, etc., are not exactly identical to those exhibited in actual engineering. The theoretical and practical deviation of the large-span bridge in construction has accumulative property, if the theoretical and practical deviation is not timely and effectively controlled and adjusted, the structural line shape can be finally deviated from a design target obviously, the internal force state after the bridge is formed is influenced, and the safety of the structure in the construction process and the safety and quality of the construction are reduced. Therefore, a large-span bridge construction monitoring method is provided to solve the difficulty existing in the prior art, and the problem to be solved by the person skilled in the art is urgent. Disclosure of Invention In view of the above, the invention provides a large-span bridge construction monitoring method for solving the technical problems in the prior art. In order to achieve the above object, the present invention provides the following technical solutions: A large-span bridge construction monitoring method comprises the following steps: Acquiring sensor monitoring data of each bridge segment in the current construction stage; Preprocessing the sensor monitoring data to obtain preprocessed data; calculating the structural displacement and the stress state of each bridge segment under the actions of dead weight, prestress, concrete shrinkage creep and temperature change according to the obtained pretreatment data, and obtaining the structural displacement and the stress state of each construction stage; determining the vertical formwork elevation of the bridge structure at each construction stage through backward analysis according to the calculated structural displacement and stress state at each construction stage; And comparing the obtained vertical model elevation and the predicted value of the bridge structure at each construction stage, and correcting the difference value between the vertical model elevation and the predicted value, thereby monitoring the construction of each bridge segment. The method, optionally, the monitoring data includes arch rib deformation, girder deformation and boom cable force. In the above method, optionally, the sensor monitoring data is acquired by a plurality of sensors disposed on each bridge segment. The method described above, optionally, the sensor includes, but is not limited to, a strain gauge sensor, an optical fiber sensor, a piezoelectric sensor, a steel string sensor. The method is optional, and the backward analysis is specifically that assuming that the internal force dist