CN203908754U - Component for simulating flexible joint of immersed tunnel - Google Patents

Abstract

The invention relates to a component for simulating a flexible joint of an immersed tube tunnel, which belongs to the technical field of engineering test and testing. The utility model is composed of angle steel, steel ring, rubber ring, bolt, high-strength steel wire, steel plate and steel bar. Measure the axial force at the joint of the immersed tunnel tunnel scale model by setting a horizontal force-measuring device in the steel washer and steel ring, and set displacement sensors on both sides of the simulated rubber waterstop to measure the displacement change of the joint, which is suitable for tunnels In the structural scale test, the research object is the test when the flexible joint is used. The utility model has simple structure, low cost of required materials, can accurately measure the axial force and displacement at the joint at the same time, and will not damage sensors and instruments.

Description

A component for simulating flexible joints of immersed tunnels

technical field

The utility model relates to a test simplified component of a flexible joint of an immersed tube tunnel, which belongs to the technical field of engineering test and test.

Background technique

The pipe section joint is an important part of the immersed tube tunnel, and it is also a weak part, and its structural strength and stiffness are more fragile than the concrete pipe section. Earthquake action or uneven settlement of immersed tube foundations and pipe sections can easily lead to dislocation and opening of the joints, reducing or even losing the water sealing effect of the joints, and posing a great threat to the normal operation and safety performance of the immersed tube tunnel , The mechanical performance of joints has always been the focus of research on immersed tunnel joints.

Using the test method to measure the stress at the joint of the immersed tunnel can better study the performance of the immersed tunnel joint and provide an important reference for the design and specification compilation. However, the general test model is only the original tunnel model based on the similarity theory It is obtained by scaling down, and its structure is the same as the original model. During the test, the response of the joint is difficult to measure. For example, the axial force of the joint is generally obtained by measuring the stress of the steel bar with a strain gauge. The measurement results are difficult to use in the analysis and design of the tunnel. In addition, the strain gauge itself is used for seismic dynamic strain measurement error is relatively large. Therefore, accurate and reasonable acquisition of the mechanical response and displacement deformation of the immersed tube tunnel joint is the key to the success of the test. Based on this, the utility model has developed a component for simulating the flexible joint of the immersed tunnel, and carried out experimental research, which has important practical significance for studying the stress and deformation performance of the joint of the immersed tunnel.

Utility model content

The utility model provides a component for simulating the flexible joint of an immersed tube tunnel. The response of the actual tunnel is obtained by setting additional rigid joints on the flexible joints of the scale model and combining force sensors and displacement sensors. This model is suitable for the test when the research object is the flexible joint in the scale-down test of the tunnel structure. The utility model has simple structure, low cost of required materials, can accurately measure the force, displacement, acceleration and other reactions at the joint, and will not damage the sensor and equipment, and the sensor can be reused.

A component used to simulate the flexible joint of an immersed tube tunnel, including steel bar I1, angle steel I2, steel washer I3, steel ring I4, force measuring device 5, loose bolt 6, thin steel plate 7, steel ring II 8, high-strength steel wire 9, Fixing bolt 10, steel washer Ⅱ11, rubber ring 12, steel ring Ⅲ13, angle steel Ⅱ14 and steel bar Ⅱ15 are characterized in that: the steel washer and steel ring are all made of steel, and the extremities of steel bar Ⅰ1 and angle steel Ⅰ2 embedded in the concrete structure 16 Welding, the steel washer I3 is welded to the extremities of the upper and lower angle steel I2 not embedded in the concrete structure 16, and one end of the steel ring I4 is welded to the inner wall of the steel washer I3; the steel bar II15 and the angle steel II14 are embedded in the concrete structure 16 The extremities are welded, the steel washer Ⅱ11 is welded to the extremities of the upper and lower angle steels Ⅱ14 that are not embedded in the concrete structure 16, one end of the steel ring Ⅲ13 is welded to the inner wall of the steel washer Ⅱ11, one side of the unwelded steel washer Ⅱ11 is coated with Apply a strong adhesive, and bond firmly with the rubber ring 12; weld a thin steel plate 7 on the upper and lower middle parts of the steel ring II8, and weld a thin steel plate 7 on the extremities of the thin steel plate 7 and the angle steel II14 that is not embedded in the concrete structure 16. holes, evenly and symmetrically arrange several high-strength steel wires 9 to pass through the thin steel plate 7 and the extremity of the angle steel II14 not embedded in the concrete structure 16, and tighten the fixing bolts on the extremity side of the angle steel II14 not embedded in the concrete structure 16 10. Install the loose bolt 6 on one side of the thin steel plate 7, and the force measuring device 5 is fixedly connected between the steel washer Ⅰ3 and the steel ring Ⅱ8.

The cross-sectional shape of steel ring II8 is the same as that of steel washer I3 and steel washer II11, and its axial stiffness is greater than that of tunnels with the same length.

The force measuring devices 5 are distributed symmetrically at the four corners of the section.

The high-strength steel wire 9 is connected to the tunnel model and the steel ring II 8, and the positions of the loose bolt 6 and the fixed bolt 10 can be interchanged.

The rubber ring 12 can be replaced by several springs evenly arranged around the unwelded surface of the steel washer II11, one end of the spring is fixedly connected with the steel washer II11, and the other end is connected or not connected with the steel ring II8.

The high-strength steel wires 9 are evenly and symmetrically arranged along the length direction of the angle steel II14.

The steel ring III13 and the steel ring I4 are respectively set on the inner side between the steel washer II11 and the steel ring II8 and between the steel ring II8 and the steel washer I3 as shear keys.

Twist the loose bolt 6 so that when the steel ring II8 and the rubber ring 12 are squeezed tightly, a gap of at least 2 centimeters will be left between the steel ring I4 and the steel ring III13 to avoid collisions between the two.

A displacement gauge is installed between the steel washer Ⅱ11 and the steel ring Ⅱ8.

The beneficial effect of the utility model is: it provides an effective method for studying the stress and deformation performance of the joints of the immersed tube tunnel by using the test method, the method is simple and convenient, the raw materials are easy to obtain and cheap, and the joints can be accurately measured The force and deformation at the place can be used in the experimental research of tunnel structural joints.

Description of drawings

Fig. 1 is the elevation view of the joint member of the present utility model;

Fig. 2 is the plane view of the joint member of the present utility model;

Fig. 3 is the elevation view of the joint member when the bolt is tightened in the utility model;

Fig. 4 is a schematic diagram of the welding cross-section of the steel washer I3 and the steel ring I4 of the joint member of the present invention;

Fig. 5 is a schematic diagram of the connection cross-section of the steel washer II11, the rubber ring 12 and the steel ring III13 of the joint member of the present invention;

Fig. 6 is the detailed dimensional drawing of the cross section of the tunnel model of the utility model example;

Fig. 7 is the tunnel model of the utility model example-joint layout schematic diagram;

Fig. 8 is a three-dimensional schematic diagram of a joint of an example of the utility model;

Fig. 9 is a welding diagram of joint member angle steel and steel bar of the present invention;

In the figure: 1—rebar Ⅰ, 2—angle steel Ⅰ, 3—steel washer Ⅰ, 4—steel ring Ⅰ, 5—force measuring device, 6—loosen bolts, 7—steel plate, 8—steel ring Ⅱ, 9—high strength Steel wire, 10—fixing bolt, 11—steel washer II, 12—rubber ring, 13—steel ring III, 14—angle steel II, 15—steel bar II, 16—concrete structure, 17—binding steel wire.

Detailed ways

As shown in Figure 1-9, the utility model is a component for simulating the flexible joint of an immersed tube tunnel, including steel bar I1, angle steel I2, steel washer I3, steel ring I4, force measuring device 5, loose bolt 6, Steel plate 7, steel ring II 8, high-strength steel wire 9, fixing bolt 10, steel washer II 11, rubber ring 12, steel ring III 13, angle steel II 14, steel bar II 15. The extremities of steel bar I1 and angle steel I2 embedded in concrete structure 16 are welded, steel washer I3 is welded to the extremities of upper and lower angle steel I2 not embedded in concrete structure 16, and one end of steel ring I4 is welded to the end of steel washer I3 inner wall. The extremities of steel bar II15 and angle steel II14 embedded in the concrete structure 16 are welded, the steel washer II11 is welded to the extremities of the upper and lower angle steel II14 not embedded in the concrete structure 16, and one end of the steel ring III13 is welded to the end of the steel washer II11 On the inner wall, one side of the unwelded steel washer Ⅱ11 is coated with a strong adhesive, and bonded firmly with the rubber ring 12, a steel plate 7 is welded on the upper and lower middle of the steel ring Ⅱ8, and the steel plate 7 and the unembedded concrete The extremities of the angle steel II14 in the structure 16 are punched, and several high-strength steel wires 9 are evenly and symmetrically arranged to pass through the steel plate 7 and the extremities of the angle steel II14 not embedded in the concrete structure 16. Tighten the fixed bolt 10 on the extremity side of the angle steel Ⅱ14, install the loose bolt 6 on the side of the steel plate 7, and the force measuring device 5 is fixedly connected between the steel washer Ⅰ3 and the steel ring Ⅱ8, and installed between the steel washer Ⅱ11 and the steel ring Ⅱ8 Displacement gauge.

Zhoutouzui Immersed Tube Tunnel is an underwater traffic tunnel across the Pearl River in Guangzhou. The total length of the project is 3253.034 meters, of which 340 meters in the Pearl River is the immersed tube section. The immersed tube section is divided into four sections, each section is 85 meters long, totaling 340 meters, connected by flexible joints. In view of the insufficient research on the force analysis of immersed tube tunnels under various loads, especially the joint characteristics under earthquakes, a large-scale tunnel model-underwater joints under multi-point seismic input is carried out to simulate seismic shaking table arrays In order to better grasp the underwater joints of the immersed tube tunnel and the stress and deformation response of the tunnel under the action of earthquakes, provide strong technical support for the seismic checking calculation of the Zhoutouzui tunnel project, and contribute to the formulation of seismic codes for immersed tube tunnels in my country Provide theoretical and experimental basis.

The scale ratio of the shaking table test is 1:60. The concrete tunnel model is divided into four sections, each section is 1400 mm long and 503 mm wide. The upper and lower walls of the concrete tunnel model are 22 mm thick, and the walls on both sides are 20 mm thick. 220 mm, 116 mm high rectangular hole, steel washer Ⅰ3 20 mm thick, steel ring Ⅰ4 130 mm thick, steel ring Ⅱ8 50 mm thick, steel washer Ⅱ11 20 mm thick, rubber ring 12 15 mm thick, steel ring Ⅲ 13 thick 50 mm, there are three joints in total, in this example, the angle steel is cut into a zigzag shape, in order to avoid delamination during pouring concrete, which will cause the vibration during the test and damage it. The vibration table test of immersed tube tunnel-underwater joint was carried out through the multi-dimensional and multi-point seismic shaking table array system of Beijing University of Technology, and the displacement and axial force at the joint were accurately measured.

Claims (9)

1. A member for simulating the flexible joint of an immersed tube tunnel, including steel bar I (1), angle steel I (2), steel washer I (3), steel ring I (4), force measuring device (5), and Loosen the bolt (6), steel plate (7), steel ring II (8), high-strength steel wire (9), fixing bolt (10), steel washer II (11), rubber ring (12), steel ring III (13), The angle steel II (14) and the steel bar II (15) are characterized in that: steel washers and steel rings are all made of steel, and the extremities of the steel bar I (1) and the angle steel I (2) embedded in the concrete structure (16) are welded, The steel washer I (3) is welded to the extremities of the upper and lower angle steel I (2) not embedded in the concrete structure (16), and one end of the steel washer I (4) is welded to the inner wall of the steel washer I (3); Ⅱ(15) is welded to the extremity of the angle steel II(14) embedded in the concrete structure (16), and the steel washer Ⅱ(11) is welded to the upper and lower angle steel II(14) not embedded in the concrete structure (16) One end of the steel ring III (13) is welded to the inner wall of the steel washer II (11), and one side of the unwelded steel washer II (11) is coated with a strong adhesive and bonded with the rubber ring (12) The bonding is firm; a steel plate (7) is welded on the upper and lower middle of the steel ring II (8), and a hole is punched on the steel plate (7) and the extremity of the angle steel II (14) not embedded in the concrete structure (16) , a number of high-strength steel wires (9) are evenly and symmetrically arranged to pass through the steel plate (7) and the extremities of the angle steel II (14) not embedded in the concrete structure (16), and the angle steel wires not embedded in the concrete structure (16) Tighten the fixed bolt (10) on one side of the extremity of II (14), place the loose bolt (6) on the side of the steel plate (7), and the force measuring device (5) is fixedly connected to the steel washer I (3) and the steel ring II (8) between. the 2. A member for simulating the flexible joint of an immersed tube tunnel according to claim 1, characterized in that: the cross-sectional shape of steel ring II (8) is the same as that of steel washer I (3) and steel washer II (11). The cross-sectional shape is the same, and its axial stiffness is greater than that of tunnels of the same length. the 3. A component for simulating a flexible joint of an immersed tunnel according to claim 1, characterized in that the force measuring devices (5) are symmetrically distributed at the four corners of the section. the 4. A component for simulating the flexible joint of an immersed tube tunnel according to claim 1, characterized in that: the high-strength steel wire (9) is connected to the tunnel model and the steel ring (8), and the bolt (6) and The positions of the fixing bolts (10) can be interchanged. the 5. A component for simulating the flexible joint of an immersed tunnel according to claim 1, characterized in that: the rubber ring (12) can be replaced by several springs evenly arranged around the unwelded surface of the steel washer II (11), One end of the spring is fixedly connected with the steel washer II (11), and the other end is connected or not connected with the steel ring II (8). the 6. A kind of member for simulating the flexible joint of immersed tube tunnel according to claim 1, is characterized in that: high-strength steel wire (9) is arranged uniformly and symmetrically along the length direction of angle steel II (14). the 7. A component for simulating the flexible joint of an immersed tunnel according to claim 1 or 2, characterized in that: between the steel washer II (11) and the steel ring II (8) and between the steel ring II (8) Steel ring III (13) and steel ring I (4) are respectively set on the inner side between steel washer I (3) as shear keys. the 8. A component for simulating the flexible joint of an immersed tunnel according to claim 1 or 5, characterized in that: the loose bolt (6) is twisted so that the steel ring II (8) and the rubber ring (12) When squeezed tightly, a gap of at least 2 cm will be left between the steel ring I (4) and the steel ring III (13) to avoid collisions between the two. the 9. A component for simulating a flexible joint of an immersed tunnel according to claim 1, characterized in that a displacement gauge is installed between the steel washer II (11) and the steel ring II (8). the