Stress monitoring device of steel lining composite lining structure

Abstract

The utility model discloses a stress monitoring device of a steel lining composite lining structure. An outer lining-surrounding rock contact interface pressure monitoring unit, an outer lining-middle lining contact interface pressure monitoring unit, an outer lining segment concrete strain monitoring unit, a middle lining self-compacting concrete circumferential strain monitoring unit, a middle lining-lining contact interface pressure monitoring unit and a lining steel pipe circumferential strain monitoring unit are arranged on the stress monitoring section. The stress monitoring device provided by the utility model can ensure that the water delivery tunnel is always in a safe and controllable state.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic tunnel monitoring, in particular to a force monitoring device for a steel-lined composite lining structure. Background Art

[0002] In recent years, with the vigorous development of long-distance water transfer projects in my country, the internal water pressure of water transfer tunnels has become increasingly higher. In view of the major safety risks faced by the project, through remote automated real-time monitoring of the internal forces of the composite lining structure of the shield tunnel, the internal force law of the composite lining structure is mastered, and the real-time early warning and alarm function of tunnel structure safety is realized, thereby improving the risk monitoring and early warning level of related similar projects and the emergency rescue capabilities of accidents, ensuring that the water transfer tunnel is always in a safe and controllable state. Utility Model Content

[0003] In order to overcome the above technical defects, the utility model provides a force monitoring device for a steel-lined composite lining structure, which can monitor the contact state and mechanical behavior between multiple linings and between an outer lining and surrounding rock.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A stress monitoring device for a steel-lined composite lining structure is provided with an outer lining-surrounding rock contact interface pressure monitoring unit, an outer lining-middle lining contact interface pressure monitoring unit, an outer lining segment concrete strain monitoring unit, a middle lining self-compacting concrete annular strain monitoring unit, a middle lining-inner lining contact interface pressure monitoring unit and an inner lining steel pipe annular strain monitoring unit on a stress monitoring section.

[0006] Furthermore, the outer lining-surrounding rock contact interface pressure monitoring unit and the outer lining-middle lining contact interface pressure monitoring unit include a plurality of fiber grating soil pressure gauges, which are respectively arranged on the outer arc surface and the inner arc surface of the pipe segment.

[0007] Furthermore, the spacing between the outer arc surface fiber Bragg grating soil pressure gauges is 70°; the spacing between the inner arc surface fiber Bragg grating soil pressure gauges is 35°.

[0008] Furthermore, the outer lining segment concrete strain monitoring unit includes a glass cloth strain sensing optical cable and a fiber grating patch strain gauge.

[0009] Furthermore, the glass fiber cloth strain sensing cable has a measuring range of 20,000 με and an accuracy of 2 με, and is arranged at 270° on the upper circumference between the pipe segment and the composite drainage board; the fiber grating patch strain gauge has a measuring range of -1500 to +1500 με and an accuracy of 9 με, and is arranged on the inner arc surface of the pipe segment with a spacing of 30°.

[0010] Furthermore, the annular strain monitoring unit of the self-compacting concrete of the middle lining includes a fixed-point strain sensing optical cable, which is arranged at 270° on the upper part of the inner circumference of the composite drainage board and the entire circumference of the outer side of the inner lining.

[0011] Furthermore, the middle liner-inner liner contact interface pressure monitoring unit includes a fiber grating soil pressure gauge, which is arranged on the outer arc surface of the inner liner steel pipe with a spacing of 30°.

[0012] Furthermore, the circumferential strain monitoring unit of the lined steel pipe includes a carbon fiber composite-based strain sensing optical cable, which is arranged around the entire circumference of the outer arc surface of the lined steel pipe and 270° at the upper part of the inner arc surface of the steel pipe.

[0013] Furthermore, the middle liner-inner liner contact interface pressure monitoring unit includes five fiber grating soil pressure gauges.

[0014] Furthermore, one arc surface is provided on the outer arc surface of the lining steel pipe and one arc surface is provided on the inner arc surface of the steel pipe respectively.

[0015] Beneficial effects of the utility model:

[0016] The utility model monitors the contact state and mechanical behavior of the multi-layer lining structure of the shield tunnel, grasps the internal force and deformation law of the multi-layer lining structure, and realizes the real-time early warning and alarm function of the tunnel structure safety, thereby improving the risk monitoring and early warning level of accidents in high internal pressure water conveyance projects and the accident emergency rescue capabilities, ensuring that the water conveyance tunnel is always in a safe and controllable state. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the position of each layer of the lining of the multi-layer lining structure of the high internal pressure shield tunnel of the utility model.

[0018] Figure 2 It is a schematic diagram of the layout position of the fiber optic Bragg grating soil pressure gauge for the outer liner segment of the utility model.

[0019] Figure 3 The utility model is a schematic diagram of the layout positions of the glass-lined strain-sensitive photometric cable and the optical fiber grating patch type strain gauge.

[0020] Figure 4 This is a schematic diagram of the layout position of the fixed-point strain sensing optical cable specially used for concrete structure of the utility model.

[0021] Figure 5 It is a schematic diagram of the layout position of the fiber grating soil pressure gauge of the utility model.

[0022] Figure 6 It is a schematic diagram of the layout position of the carbon fiber composite-based strain sensing optical cable of the utility model.

[0023] Figure 7 It is a structural diagram of the utility model. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0025] Example

[0026] like Figure 1-Figure 7 As shown, a stress monitoring device for a steel-lined composite lining structure is shown. The steel-lined composite lining structure has three layers in total. The outermost layer of pieces is called a pipe segment. In this embodiment, a seven-ring pipe segment is selected. The middle black outer ring is self-compacting concrete, and the innermost is a steel lining.

[0027] The stress monitoring section is the width of one ring segment.

[0028] An outer lining-surrounding rock contact interface pressure monitoring unit, an outer lining-middle lining contact interface pressure monitoring unit, an outer lining segment concrete strain monitoring unit, a middle lining self-compacting concrete annular strain monitoring unit, a middle lining-inner lining contact interface pressure monitoring unit and an inner lining steel pipe annular strain monitoring unit are provided on the stress monitoring section. The above-mentioned monitoring units are connected to a data collection and processing unit, and the data collection and processing unit is connected to a monitoring center to realize stress monitoring.

[0029] In this embodiment, the outer liner segment includes a capping block F, two adjacent blocks L1 and L2 and three standard blocks B1-B3.

[0030] Figure 1 7 in the middle is the steel lining and 8 is the middle lining self-compacting concrete.

[0031] The outer lining-surrounding rock contact interface pressure monitoring unit and the outer lining-middle lining contact interface pressure monitoring unit include multiple fiber grating soil pressure gauges with a measuring range of 1MPa and an accuracy of 10kPa, which are arranged on the outer arc surface and the inner arc surface of the pipe segment. The spacing between adjacent fiber grating soil pressure gauges 9 arranged on the outer arc surface is 70°; the spacing between adjacent fiber grating soil pressure gauges 14 arranged on the inner arc surface is 35°.

[0032] In this embodiment, four and seven fiber grating soil pressure gauges are arranged on the outer arc surface and inner arc surface of the segment respectively in the circumferential direction to monitor the outer lining-surrounding rock and outer lining-middle lining contact interface pressures respectively.

[0033] The outer lining segment concrete strain monitoring unit includes a glass cloth strain sensing optical cable 12 and a fiber grating patch type strain gauge 10. The glass cloth strain sensing optical cable 12 has a measuring range of 20000με and an accuracy of 2με, and is arranged at 270° on the upper part of the circumference between the segment and the composite drainage board 11; the fiber grating patch type strain gauge 10 has a measuring range of -1500 to +1500με and an accuracy of 9με, and is arranged on the inner curved surface of the segment with a spacing of 30°.

[0034] In this embodiment, a glass cloth strain sensing optical cable 12 is laid at 270° on the upper part of the circumference between the pipe segment and the composite drainage board 11, and ten fiber grating patch strain gauges 10 are laid along the circumference of the inner arc surface of the pipe segment to monitor the annular strain of the pipe segment concrete.

[0035] The self-compacting concrete annular strain monitoring unit for the middle lining includes a fixed-point strain sensing optical cable 13 dedicated to concrete structures, with a measuring range of 20000με and an accuracy of 20με, which is arranged at 270° on the upper inner circumference of the composite drainage board and the entire outer circumference of the inner lining.

[0036] A fixed-point strain sensing optical cable 13 is laid in the groove of the drainage board 11. The fixed-point strain sensing optical cable is dedicated to concrete structures, and the joints are waterproofed. The cable ends are connected to the data collection and processing unit. After the system starts running, strain data is collected and transmitted to the monitoring center in real time to identify possible structural health problems.

[0037] The top and sides of the tunnel are usually subject to greater pressure from the ground and surrounding soil. Arranging optical cables within a 270° range in the upper part of the tunnel can better monitor stress and deformation. At the same time, the upper part and side walls of the tunnel are key parts for maintaining the overall stability and safety of the structure. Focusing on monitoring these areas can effectively assess the health of the entire tunnel and provide early warning of potential structural failures.

[0038] The middle liner-inner liner contact interface pressure monitoring unit includes a fiber Bragg grating soil pressure gauge 14 with a measuring range of 1 MPa and an accuracy of 10 kPa, which is arranged on the outer arc surface of the inner liner steel pipe with a spacing of 30°.

[0039] The circumferential strain monitoring device for the lined steel pipe includes a carbon fiber composite-based strain sensing optical cable 15 with a measuring range of 20000με and an accuracy of 2με, which is arranged around the outer arc surface of the lined steel pipe and 270° above the inner arc surface of the steel pipe.

[0040] In this embodiment, a carbon fiber cloth composite-based strain sensing optical cable 15 is laid on the entire circumference of the outer arc surface of the steel pipe and 270° on the upper part of the inner arc surface of the steel pipe to monitor the annular strain of the steel pipe.

[0041] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A stress monitoring device for a steel-lined composite lining structure, characterized in that: The stress monitoring section is equipped with an outer lining-surrounding rock contact interface pressure monitoring unit, an outer lining-middle lining contact interface pressure monitoring unit, an outer lining segment concrete strain monitoring unit, a middle lining self-compacting concrete annular strain monitoring unit, a middle lining-inner lining contact interface pressure monitoring unit and an inner lining steel pipe annular strain monitoring unit.

2. The force monitoring device according to claim 1, characterized in that: The outer lining-surrounding rock contact interface pressure monitoring unit and the outer lining-middle lining contact interface pressure monitoring unit both include a plurality of fiber grating soil pressure gauges, which are respectively arranged on the outer arc surface and the inner arc surface of the pipe segment.

3. The force monitoring device according to claim 2, characterized in that: The fiber optic Bragg grating soil pressure gauges are set on the outer curved surface of the pipe segment, with a spacing of 70° between adjacent ones; the fiber optic Bragg grating soil pressure gauges are set on the inner curved surface of the pipe segment, with a spacing of 35° between adjacent ones.

4. The force monitoring device according to claim 1, characterized in that: The outer lining segment concrete strain monitoring unit comprises a glass cloth strain sensing optical cable and a fiber grating patch type strain gauge.

5. The force monitoring device according to claim 4, characterized in that: The glass cloth strain sensing cable has a measuring range of 20,000 με and an accuracy of 2 με. It is arranged at 270° on the upper circumference between the pipe segment and the composite drainage board. The fiber grating patch strain gauge has a measuring range of -1500 to +1500 με and an accuracy of 9 με. It is arranged on the inner arc surface of the pipe segment with a spacing of 30°.

6. The force monitoring device according to claim 1, characterized in that: The annular strain monitoring unit of the self-compacting concrete of the middle lining includes a fixed-point strain sensing optical cable, which is arranged at 270° on the upper part of the inner circumference of the composite drainage board and the entire circumference of the outer side of the inner lining.

7. The force monitoring device according to claim 1, characterized in that: The middle liner-inner liner contact interface pressure monitoring unit comprises a fiber grating soil pressure gauge, which is arranged on the outer arc surface of the inner liner steel pipe with a spacing of 30°.

8. The force monitoring device according to claim 1, characterized in that: The circumferential strain monitoring unit of the lined steel pipe includes a carbon fiber composite-based strain sensing optical cable, which is arranged around the entire circumference of the outer arc surface of the lined steel pipe and 270° on the upper part of the inner arc surface of the steel pipe.

9. The force monitoring device according to claim 7, characterized in that: The middle liner-inner liner contact interface pressure monitoring unit comprises five fiber grating soil pressure gauges.

10. The force monitoring device according to claim 8, characterized in that: The carbon fiber composite-based strain sensing optical cable is provided on the outer arc surface of the lining steel pipe and the inner arc surface of the steel pipe respectively.

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