A pre-tensioned T-beam multifunctional test bed

Abstract

The utility model discloses a kind of multifunctional test benches of pretension T beam, including test support pedestal, loading piece and restraint, test support pedestal includes the test pedestal and support pedestal arranged up and down, test pedestal is used to place test beam and bear various loads in test process, support pedestal is movable and can be flexibly adjusted position according to test demand, loading piece realizes the multi-working condition loading of test beam, restraint provides constraint for beam end and constraint condition under different test working conditions.This test pedestal can accurately simulate the various stress working conditions of pretension prestressed T beam in actual engineering, effectively solve the problems such as single function, inaccurate loading, unreasonable constraint of existing test pedestal, provide reliable test equipment support for pretension T beam performance research in bridge engineering, help to improve the accuracy of bridge construction quality and safety evaluation.

Description

Technical Field

[0001] This utility model belongs to the technical field of bridge engineering testing equipment, and in particular relates to a multi-functional test bench for pre-tensioned T-beams. Background Technology

[0002] Prestressed T-beams are widely used in bridge construction. To ensure the quality and safety of bridges, in-depth research and testing of their performance are necessary. However, existing test rigs have several problems: 1. Limited functionality: Traditional test rigs often only perform simple loading tests and cannot fully simulate the complex stress conditions of prestressed T-beams in actual engineering projects, such as the stress conditions under different spans and loading methods. This limits the test results and cannot accurately reflect the performance of the T-beams in real-world environments. 2. Inaccurate loading: The loading system is not precise enough, making it difficult to achieve accurate loading of the T-beams, resulting in large errors in the test data. When conducting bending and shear tests, the magnitude, direction, and point of application of the loading force are difficult to control precisely, affecting the reliability of the test results. 3. Inappropriate constraints: The constraint methods for the T-beams cannot well simulate the constraint conditions in actual engineering projects, causing deviations between the test results and the actual situation. Inappropriate constraints may lead to discrepancies between the stress state of the T-beams in the test and reality, thus making it impossible to accurately evaluate the performance of the T-beams. These problems severely restrict the research and evaluation of the performance of pre-tensioned T-beams in bridge engineering, and affect the accuracy of bridge construction quality and safety assessment. Therefore, developing a multifunctional test rig that can accurately simulate various stress conditions of pre-tensioned prestressed T-beams is of great practical significance. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a multifunctional test bench for pre-tensioned T-beams to overcome the shortcomings of the prior art.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] A multifunctional test rig for pre-tensioned T-beams is provided, comprising a test support rig, a loading element, and a constraint element. The test support rig includes a test rig and a support rig arranged vertically. The test rig is used to place the test beam and bear various loads during the test. The support rig is movable and its position can be flexibly adjusted according to test requirements. The loading element enables multi-condition loading of the test beam. The constraint element provides constraints for beam end constraints and constraints under different test conditions.

[0006] According to the pre-tensioned T-beam multifunctional test bench, the loading components include a loading crossbeam, a distribution beam, jacks, and sensors. The loading crossbeam and the distribution beam are used to adjust the loading point and the magnitude of the loading force according to the test requirements to achieve multi-condition loading of the test beam. The load is slowly applied by the jacks, and the loading force and the deformation of the test beam are monitored in real time by the sensors.

[0007] According to the pre-tensioned T-beam multifunctional test rig, the constraint components include pre-embedded bolts and constraint beams set at the beam end constraint sections of the test beam.

[0008] According to the pre-tensioned T-beam multifunctional test rig, the test rig and the support rig are pre-embedded with various anchor bolts, and a local reinforcing steel mesh and positioning steel plate are provided around the pre-embedded anchor bolts.

[0009] The beneficial effects of this utility model's technical solution are:

[0010] 1. Accurate simulation of stress conditions: By rationally designing the main structure, loading system and constraint system of the test platform, this test platform can accurately simulate various stress conditions of prestressed T-beams in actual engineering, including stress conditions under different spans, different loading methods and different constraint conditions. This makes the test results closer to the actual situation and provides reliable data support for the performance research of prestressed T-beams in bridge engineering.

[0011] 2. Improved loading accuracy: The loading system uses high-precision jacks and sensors, combined with rationally designed loading beams, distribution beams and other components, to achieve precise loading of the test beam. The magnitude, direction and point of application of the loading force can be precisely controlled, effectively reducing the error of the test data and improving the reliability of the test results.

[0012] 3. Optimized constraints: The constraint system is designed based on the constraint characteristics in actual engineering, which can provide reasonable constraints for the test beam, making the stress state of the test beam during the test more similar to the stress state in actual engineering. This helps to accurately evaluate the performance of the pre-tensioned T-beam and provide a more accurate reference for bridge design and construction.

[0013] 4. Multifunctional integration: This test rig integrates multiple functions and can perform various tests such as bending and shear resistance. It is suitable for pre-tensioned T-beam tests of different specifications. Its multifunctionality improves the efficiency of the test rig, reduces testing costs, and provides convenience for bridge engineering testing.

[0014] In summary, this test rig accurately simulates various stress conditions of prestressed T-beams in actual engineering projects, providing reliable test equipment support for the performance research of prestressed T-beams in bridge engineering. Attached Figure Description

[0015] To further illustrate the above-mentioned objectives, structural features, and effects of this utility model, the following will describe this utility model in detail with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the test support platform structure of a preferred embodiment of the present invention;

[0017] In the figure: 1-support platform, 2-C20 platform pad, 3-small crossbeam, 4-rectangular section, 5-embedded bolt with d=68mm, 6-embedded bolt with d=42mm, 7-test beam. Detailed Implementation

[0018] The terms “utility model” and “this utility model” used in this specification are intended to broadly refer to all subject matter of this specification and any of the following patent claims. Statements containing these terms should not be construed as limiting the subject matter described herein or limiting the meaning or scope of any of the following patent claims. Furthermore, this specification does not attempt to describe or limit the subject matter covered by any claim of any particular component, paragraph, statement, or drawing of this application. The subject matter should be understood with reference to the entire specification, all drawings, and any of the following claims. This utility model may have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the wording and terminology used herein are for illustrative purposes and should not be considered limiting.

[0019] The details of the present invention will now be discussed with reference to the accompanying drawings, which are illustrated by way of example only. In the drawings, similar features or components may be labeled with the same reference numerals.

[0020] The use of the terms "comprising," "having," and "including," and variations thereof, herein means to include the items listed herein, their equivalents, and additional items. While reference may be made in the description of the drawings to directions such as above, below, upward, downward, backward, bottom, top, front, rear, etc., for convenience, reference is made relative to the drawings. These directions are not intended to literally accept or limit the invention in any form. Furthermore, terms such as "first," "second," "third," etc., are used herein for illustrative purposes and are not intended to indicate or imply importance or significance.

[0021] See Figure 1As shown, this utility model includes a test support platform, a loading component, and a constraint component. The test support platform includes a test platform and a support platform 1 arranged vertically. The main body of the test support platform is made of high-strength concrete. The test platform is used to place the test beam 7 and bear various loads during the test. Its concrete strength grade is C50 to ensure sufficient load-bearing capacity. The support platform 1 is movable and can be flexibly adjusted according to test requirements, cooperating with the test platform to provide stable support for the test beam 7. The test platform has a rectangular cross-section section 4, whose dimensions are reasonably designed to adapt to the test requirements of pre-tensioned T-beams of different specifications. A large number of steel bars are arranged in the rectangular cross-section section 4, including longitudinal bars and stirrups of different diameters, such as longitudinal bars with diameters of 32mm, 20mm, and 16mm, and stirrups with corresponding specifications. Through reasonable steel bar configuration, the load-bearing capacity and crack resistance of the platform are enhanced.

[0022] Loading System (Loading Components): The loading system includes components such as a large loading beam, distribution beam, loading beam, and transfer beam (labeled 3 in the diagram represents a small beam). The large loading beam is made of high-strength steel, and its structural design effectively transfers and distributes the load, ensuring uniform loading. The loading beam and distribution beam are configured to adjust the loading points and the magnitude of the loading force according to test requirements, enabling multi-condition loading of the test beam 7. During loading, by using jacks of different tonnages, such as 100 tons, 300 tons, and 1500 tons, combined with sensors to monitor the loading force in real time, the loading force can be precisely controlled, ensuring loading accuracy. Simultaneously, the connections between the various components of the loading system are robust, ensuring that no loosening or deformation occurs during the test, affecting the test results.

[0023] Constraint System (Constraint Components): The constraint system is specially designed to address the constraints at the beam ends and under different test conditions. At the beam end constraint section, by setting up reasonable constraint structures, such as pre-embedded bolts and constraint beams, the beam end constraint conditions of pre-tensioned T-beams in actual engineering can be effectively simulated. For different test conditions, such as mid-span bending tests, large shear span ratio tests, and small shear span ratio tests, corresponding constraint methods were designed to ensure that the stress state of test beam 7 under various conditions matches that of actual engineering. In the mid-span bending test, by setting appropriate supports and constraints at the mid-span position of test beam 7, the stress condition of a T-beam in an actual bridge is simulated; in the large shear span ratio tests and small shear span ratio tests, by adjusting the position and constraint method of the constraint beams, accurate simulation of different shear span ratio conditions is achieved.

[0024] Embedded components and connection structures: Various anchor bolts, such as bolts with diameters of 42mm (labeled 6 in the figure) and 68mm (labeled 5 in the figure), are pre-embedded in the test pedestal and support pedestal 1 to connect components such as the test beam 7, loading system, and constraint system. The arrangement of these anchor bolts is carefully designed to ensure the strength and stability of the connection. Simultaneously, a locally reinforced steel mesh is installed around the embedded anchor bolts to further enhance the load-bearing capacity of the connection points between the pedestal and other components, preventing localized damage during the test. In addition, positioning steel plates of different models are installed, with reasonable dimensions and positions to accurately determine the location of the embedded anchor bolts and ensure the installation accuracy of the test equipment.

[0025] In practice:

[0026] 1. Base production

[0027] Test bench fabrication: First, pour the C20 test bench foundation layer 2. Then, construct the formwork for the test bench according to the design requirements. The formwork should have sufficient strength and sealing to ensure the quality of the concrete pouring. Mix C50 concrete according to the design mix ratio and pour it in layers, controlling the thickness of each layer within a reasonable range to ensure the compactness of the concrete. During the pouring process, vibrate the concrete in a timely manner to remove air bubbles. Simultaneously, accurately tie the reinforcing bars according to the requirements of the test bench reinforcement layout drawing before concrete pouring, ensuring that the position and quantity of the reinforcing bars meet the design requirements. After the reinforcing bars are tied, install the pre-embedded anchor bolts (labeled 5 and 6). According to the pre-embedded anchor bolt layout drawing of the test bench, accurately determine the position of the anchor bolts using positioning steel plates and firmly fix them to prevent displacement during concrete pouring.

[0028] Fabrication of Support Platform 1: The fabrication process for Support Platform 1 is similar to that of the test platform, using C50 concrete. Formwork is erected and reinforcement is tied according to the dimensional requirements of the support platform's structural drawing. During reinforcement tying, the specifications, quantity, and arrangement of the reinforcement are ensured to be correct according to the requirements of the support platform's reinforcement layout drawing. During the pouring process, attention is also paid to compaction to ensure the quality of the support platform. After fabrication, Support Platform 1 is cured to ensure its strength meets design requirements.

[0029] 2. Load system installation

[0030] Installation of movable support pedestals 1: Based on the steel beam structure drawing, install the movable support pedestals 1 at the test site according to the design requirements. Installation should ensure accurate positioning and secure connections. For movable support pedestals 1 in different locations, install them in the corresponding sequence, such as first installing the left end closest to rectangular section 4, then installing the other movable support pedestals 1. During installation, use appropriate hoisting equipment to ensure installation accuracy.

[0031] After the movable support base 1 is installed, continue to install the small crossbeams 3 in sequence according to the design requirements, in the same order as the movable support base 1.

[0032] 3. Installation and Testing of the Test Beam

[0033] Installation of Test Beam 7: Transport Test Beam 7 to the test site. According to the requirements of the test plan, accurately install Test Beam 7 on the test rig using pre-embedded anchor bolts (labeled 5 and 6) and corresponding connecting components. During installation, ensure that Test Beam 7 is correctly positioned and securely connected to the loading and constraint systems.

[0034] Test Procedure: The parameters of the loading and constraint systems were adjusted according to different test conditions, such as mid-span bending tests, large shear-span ratio tests, and small shear-span ratio tests. During the test, the load was slowly applied using jacks according to the predetermined loading procedure, and sensors were used to monitor the loading force and deformation of the test beam in real time. Data during the test was recorded, including loading force, deformation, and crack development. The stress state of the test beam was closely observed during the test; if any abnormalities were found, the test was stopped immediately for inspection and analysis.

[0035] Data Processing and Analysis: After the experiment, the collected data were organized and analyzed. Based on the experimental objectives, the bending strength, shear strength, stiffness, and other performance indicators of the test beam were calculated. By comparing and analyzing data under different experimental conditions, the performance of test beam 7 in actual engineering was evaluated. The results of the experimental data analysis provide a reference for the design, construction, and quality assessment of test beam 7 in bridge engineering.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multifunctional test bench for pre-tensioned T-beams, characterized in that, The test support includes a test support platform, a loading element, and a constraint element. The test support platform includes a test platform and a support platform arranged vertically. The test platform is used to place the test beam and bear the load during the test. The support platform is movable and its position can be adjusted according to the test requirements. The loading element realizes multi-condition loading of the test beam. The constraint element provides constraint conditions for beam end constraints and different test conditions.

2. The multifunctional test rig for pre-tensioned T-beams according to claim 1, characterized in that, The loading components include a loading beam, a distribution beam, jacks, and sensors. The loading beam and the distribution beam are used to adjust the loading point and the magnitude of the loading force according to the test requirements to achieve multi-condition loading of the test beam. The load is slowly applied by the jacks, and the loading force and the deformation of the test beam are monitored in real time by the sensors.

3. The multifunctional test rig for pre-tensioned T-beams according to claim 1, characterized in that, The constraint components include embedded bolts and constraint beams installed at the beam end constraint sections of the test beam.

4. The multifunctional test rig for pre-tensioned T-beams according to claim 1, characterized in that, The test pedestal and the support pedestal are pre-embedded with various anchor bolts, and a local reinforcing steel mesh and positioning steel plate are provided around the pre-embedded anchor bolts.

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