CN1331103C - Arch bridge expiremental stage - Google Patents

Abstract

The present invention relates to an arch bridge experimental stage which comprises a stage plate (8), wherein the stage plate (8) is provided with two tower frames (1) whose top ends are respectively provided with a cable saddle (2), and a rope (17) arranged between the cable saddles (2) is provided with a hook (23). The stage plate (8) between the two tower frames (1) is provided with a detachable arch bridge model for installation and test. The present invention provides a basic stage for students to carry out comprehensive, designed and studying experiments, systematically trains expert managers, inspectors and monitors, and ensures that students carry out designed and studying experiments on the stage.

Description

Arch bridge bridge test bench

technical field

The invention relates to a bridge, in particular to a bridge experiment platform with the purposes of teaching, bridge design, construction demonstration, etc., especially an arch bridge experiment platform.

Background technique

With the lifelong responsibility system for project quality, people pay more attention to the quality of bridges and the monitoring and monitoring in the process of bridge construction. Therefore, it is urgent to train more excellent monitoring and monitoring talents in the process of bridge construction.

At present, the training of bridge engineering construction process management, monitoring and monitoring personnel is mainly in the form of book teaching and on-site practice. This training method is poor intuition, low in efficiency, and takes a long time.

Contents of the invention

The technical problem to be solved by the present invention is to provide a bridge test bench for arch bridges, which can provide a comprehensive, intuitive and efficient platform for cultivating management, monitoring and monitoring personnel in the construction process of arch bridges and bridges.

The technical solution adopted by the present invention to solve the problems of the technologies described above is:

Arch bridge bridge experiment platform, it includes platform, and platform is provided with two towers, and the top of two towers is provided with cable saddle respectively, and rope is arranged between cable saddle, and rope is provided with hook; On the platform in between there is a detachable model of the arch bridge for installation and testing.

In the above scheme, three pairs of cable saddles are arranged on the tops of the two towers, and ropes are arranged between the three pairs of cable saddles.

In the above solution, it also includes a hoist system for pulling the rope, and the hoist system includes a hoist and a transmission control box for controlling the hoist.

In the above scheme, the top of the tower is fixed with buckle cables for pulling the steel pipe arch of the bridge model of the arch bridge.

In the above solution, a ring sensor is provided on the buckle cable, and its output end is connected to the computer through an A/D converter.

In the above solution, a unidirectional tension-compression strain sensor is provided on the tower, and its output end is connected to a computer through an A/D converter.

In the above scheme, the connection between the tower and the platform is reinforced by cable wind.

In the above solution, a double-beam tension, compression and torsion sensor is arranged between the root of the tower and the platform, and its output end is connected to the computer through an A/D converter.

In the above scheme, the test bench also includes:

Loading system for setting up on the deck system of the arch bridge model,

Multiple stress concentration sensors for installation on the top of the suspenders of the arch bridge model,

High and low temperature strain monitoring gauges for setting on the arch bridge model steel pipe arch,

For the double-hole sensor set at the foot of the steel pipe arch,

Displacement sensor for setting between the tower and the rope;

The output terminals of each sensor are connected with the computer through the A/D converter.

The advantages of the present invention are:

1. The entire bridge construction process

It can provide a practice base for students' bridge practice, on which the simulation of the bridge construction process, the stress simulation of the steel pipe arch hoisting process, the neural network system prediction of the arch bridge alignment and the control elevation simulation, the tower displacement simulation, and the concrete pouring process The simulation of the bridge test, the simulation of the self-climbing basket, etc. It can demonstrate the whole process of construction, monitoring and monitoring. Learn the installation sequence of each part, and the stress situation of each part when it is installed to each part. It allows students to do the actual operation of each link by themselves, and can complete the entire bridge installation process in a relatively short period of time.

2. Inspection after the arch bridge model is built

The static load test of the arch bridge bridge model is carried out in various working conditions, and the stress change of the bridge deck (static and dynamic) can be tested, and the deflection test, horizontal (vertical) displacement test of the pier, natural frequency test, steel pipe arch stress test can be carried out etc., and can accurately draw the test curve through the computer.

It can also carry out the inspection, maintenance and reinforcement test of the old bridge after the bridge has been used for a long time. The hanging basket used for bridge detection can be used to freely reach the desired place for flaw detection, and the reinforcement and stress test of each component of the bridge can be carried out.

3. The structure of the tower is compact, and the bridge model of the arch bridge is built in the form of the tower (tower buckle in one), which can greatly reduce the cost of building the bridge.

4. Tension is a self-closed system, and the sensors used are highly sensitive, stable and reliable. Advanced testing instruments and testing methods. Many comprehensive, design and research type experiments can be made on the arch bridge bridge test bench of the present invention.

The invention provides a basic platform for students to set up comprehensive, design and research experiments, and can systematically train skilled management, monitoring and monitoring personnel, so that students can engage in design and research experiments on this platform.

Description of drawings

Fig. 1 is the structural representation of arch bridge bridge test platform embodiment (built state) of the present invention

Fig. 2 is the top view of the embodiment (built state) of the arch bridge bridge test bench of the present invention

Fig. 3 is a sectional view of A-A of Fig. 1

Fig. 4 is a B-B sectional view of Fig. 1

Detailed ways

As shown in Figures 1 and 2, the embodiment of the arch bridge bridge test platform of the present invention comprises a long platform 8 of about 3 meters, and the platform 8 is provided with two towers 1 with a height of 1.9 meters. The boards 8 are reinforced by cable wind 21 . Three pairs of cable saddles 2 are arranged on the tops of the two towers 1 respectively, and ropes 17 are arranged between the three pairs of cable saddles 2 . A hoist system for pulling the rope 17 is provided on the platform 8 , and the hoist system includes a hoist 7 and a transmission control box 18 for controlling the hoist 7 . The rope 17 is provided with a hook 23; the platform 8 between the two towers 1 is provided with a detachable arch bridge model for installation and testing.

The completed arch bridge bridge model includes a steel pipe arch 3, a suspender 4 suspended on the steel pipe arch 3, and a bridge deck system 5 suspended by the suspender 4. The cross-sectional view of the steel pipe arch 3 is shown in Figure 3, and the cross-sectional view of the deck system 5 is shown in Figure 4. The 3-axis of the steel pipe arch adopts the cubic spline curve based on the catenary.

Cable wind 21 is made with steel wire rope, is used for tower frame 1 lateral fixation.

A dual-hole sensor 14 for force measurement is installed at the arch foot of each steel pipe arch 3 to grasp the stressed situation of each arch in time. In terms of elevation control, the neural network system is used to predict and control the elevation. From the perspective of the monitoring system, it can monitor the force or stress of each key part of each working condition at any time, and then issue scientific instructions to guide the construction unit to carry out scientific construction to ensure the reliability of the project. After the arch is formed, concrete pouring should be carried out at the arch foot of the steel pipe arch 3. During the pouring, the stress of the steel pipe arch 3 should be tracked and measured in time, and the concrete density flaw detection test should also be carried out.

The top of the tower 1 is fixed with a buckle cable 6 for pulling the steel pipe arch 3 of the arch bridge model. The buckle cable 6 is a threaded steel bar, and the buckle cable 6 is provided with a ring sensor 12. The cable force test adopts the natural frequency force measurement method and The sensor dynamometer method uses the dynamic cable adjustment method to ensure the tension of each buckle cable 6 and the design elevation of each segment. A one-way tension-compression strain sensor 19 is provided on the pole of the tower 1 , and a double-beam tension-compression torsion sensor 16 is provided between the root of the tower 1 and the platform 8 .

The test bench also includes: a loading system 22 for being arranged on the deck system 5 of the arch bridge model, a multi-stress concentration sensor 11 for being arranged on the top of the suspender 4 of the arch bridge model, and a multi-stress concentration sensor 11 for being arranged on the bridge model of the arch bridge. The high and low temperature strain monitoring gauge 13 on the steel pipe arch 3, the double-hole sensor 14 for setting at the foot of the steel pipe arch 3, and the displacement sensor 20 for setting between the tower 1 and the rope 17.

The multi-stress concentration sensor 11 is used to measure the stress of the boom, the ring sensor 12 is used to measure the wind stress of the cable, the high and low temperature strain monitoring gauge 13 is used to measure the stress and strain of the steel pipe arch, and the double hole sensor 14 is used to measure the stress of the steel pipe arch 3 arch foot The double-beam tension, compression and torsion sensors 16 are used to measure the stress of the tower 1; at the root of the tower 1, the two arch feet of the steel pipe arch 3, L/4, 3L/8 (L represents the length of the steel pipe arch 3 projected on the horizontal plane ) and the vault are equipped with a unidirectional tension-compression strain sensor 15, the unidirectional tension-compression strain sensor 15, the high and low temperature strain monitoring gauge 13, and the ring sensor 12 are used to measure the strain value of the steel pipe arch 3 in the construction process. Ensure safe and reliable construction. The displacement sensor 20 is used to measure the offset of the tower to measure the stress displacement and defect situation in the bridge construction or loading 22 process, completed bridge, old bridge flaw detection and reinforcement. The unidirectional tension-compression strain sensor 19 is used to measure the stress at the bottom of the tower.

The output terminals of the above sensors are connected with the computer through the A/D converter.

The embodiment of the present invention can also use the hanging basket 9 for bridge detection and the hanging basket 10 for steel pipe arch welding to complete the hoisting and flaw detection of the steel pipe arch 3, the boom 4 and the bridge deck system 5.

The method of carrying out the experiment: first, attach strain gauges on the tower 1 and the steel pipe arch 3, and carry out the trial lifting of the first section of the steel pipe arch. Keep the maximum deflection within the allowable range. After installing a segment, it is necessary to carry out sensor manufacturing and calibration experiments, stress measurement experiments, elevation measurement and alignment process, involving levels and theodolite measurement experiments, using the total station to measure steel pipe arch alignment experiments, buckle cables and cable winds Cable force test. The neural network system is used to predict and control the elevation until the steel pipe arch closes. After closing, the buckle cable is loosened, the arch foot is sealed, and then the steel tube concrete is poured. Use a non-metallic flaw detector to detect the concrete solidity of the full arch. Move the cable saddle 2 to the inside of the tower frame 1 to install the beam and suspender system 4 and the bridge deck system 5 . At this time, the test of the suspender force and the test of the bridge deck elevation should be carried out. The centering of the steel pipe arch 3 and the adjustment of the elevation are completed with the buckle cable 6, the winch system, and the platen 8. Use multi-stress concentration sensors 11, ring sensors 12, high and low temperature strain monitoring gauges 13, double hole sensors 14, double beam tension, compression, torsion sensors 16, unidirectional tension and compression strain sensors 19, and displacement sensors 20 to measure the bridge construction process Among them, completed bridge detection, old bridge flaw detection and stress displacement and defects in reinforcement. Data acquisition, curve display, construction process simulation, etc. can also be carried out through high and low temperature ultra-micro strain measurement systems, dynamic strain gauges, static strain gauges, and computer systems; many kinds of research experiments can also be carried out to achieve simulation and simulation of actual conditions .

Claims (9)

1, arch bridge expiremental stage is characterized in that: it comprises platen (8), and platen (8) is provided with two pylons (1), and the top of two pylons (1) is respectively equipped with cable saddle (2), is provided with rope (17) between the cable saddle (2), and rope (17) is provided with suspension hook (23); Platen (8) between two pylons (1) is provided with and is used to the detachable arch bridge model installing and test.

2, experiment table as claimed in claim 1 is characterized in that: the top of two pylons (1) is provided with three pairs of cable saddles (2), is equipped with rope (17) between three pairs of cable saddles (2).

3, experiment table as claimed in claim 1 is characterized in that: it also comprises the hoist system that is used for rope for traction (17), and hoist system comprises windlass (7) and is used to control the transmission control box (18) of windlass (7).

4, experiment table as claimed in claim 1 is characterized in that: pylon (1) top is fixed with the knotted rope (6) of the steel tube arch (3) that is used for tractive arch bridge model.

5, experiment table as claimed in claim 4 is characterized in that: knotted rope (6) is provided with ring type sensor (12), and its output terminal is connected with computing machine by A/D converter.

6, experiment table as claimed in claim 1 is characterized in that: pylon (1) is provided with unidirectional tension and compression strain transducer (19), and its output terminal is connected with computing machine by A/D converter.

7, experiment table as claimed in claim 1 is characterized in that: reinforce by guy (21) between pylon (1) and the platen (8).

8, experiment table as claimed in claim 1 is characterized in that: be provided with twin beams twisting tension and compression sensor (16) between the root of pylon (1) and the platen (8), its output terminal is connected with computing machine by A/D converter.

9, experiment table as claimed in claim 1 is characterized in that: also comprise on the testing table:

Be used to be arranged on loading system (22) on the bridge deck (5) of arch bridge model,

Be used to be arranged on suspension rod (4) top of arch bridge model many stress centralized sensors (11),

Be used to be arranged on high low temperature strain monitoring rule (13) on the arch bridge model steel tube arch (3),

Be used to be arranged on steel tube arch (3) arch springing place diplopore sensor (14),

Be used to be arranged on the displacement transducer (20) between pylon (1) and the rope (17);

The output terminal of each sensor is connected with computing machine by A/D converter.