Stress-strain intelligent main cable strand anchoring device and anchor manufacturing method

Abstract

A stress-strain intelligent main cable strand anchoring device is composed of a conical outer mold, a conical inner mold and an ejector rod. A steel wire with a conduction function penetrates through an inner hole of the anchoring device, the anchoring device is arranged in the anchorage device and used for high-temperature protection of the steel wire with the conduction function during alloy pouring, the problems of high-temperature protection and synchronous anchoring during preparation are solved, the structure is simple, and operation is easy and convenient.

Description

Technical Field

[0001] The present invention relates to a stress-strain intelligent main cable strand anchoring method, in particular to an anchoring method using an anchoring device, and belongs to the technical field of metal product processing. Background Art

[0002] The stress variation parameters of the main cables of suspension bridges are important indicators that affect the health of the bridge throughout its life cycle. The current development direction of operation and maintenance management is to accurately obtain these parameters in real time and use them to initiate operation and maintenance measures in a timely manner to ensure the healthy service of the main cables. The main cable is composed of main cable strands, which contain smart steel wires for detecting stress and strain. In existing technologies, smart steel wires for detecting stress and strain are made of CFRP (carbon fiber reinforced composite material) and are led out from the anchor end. However, the temperature tolerance of smart steel wires is not high, and the smart steel wires are required to be anchored in the anchor at the same time. The instantaneous anchoring temperature of the main cable strands reaches above 460°C, while the temperature tolerance of smart steel wires is 180-200°C. Solving the high-temperature protection and synchronous anchoring during preparation is extremely difficult and critical. Summary of the Invention

[0003] The present invention designs a stress-strain smart main cable strand anchoring device and anchoring method to solve the technical problem of high-temperature protection of the smart steel wire when the main cable strand is cast with alloy in the anchor.

[0004] The principle of the present invention is that the conical inner mold through which the smart steel wire passes is inserted into the conical outer mold, and the thread of the push rod is screwed together to apply pressure to fix the entire device, thereby protecting the smart steel wire from high temperature.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: A stress-strain smart main cable strand anchoring device consists of a conical outer mold, a conical inner mold, and a push rod. The conical inner mold is wedged into the hole of the conical outer mold, and the push rod, which is threaded with the conical outer mold, applies pressure to secure the anchoring device, protecting the smart steel wire passing through the anchoring device hole. The push rod is also equipped with a vent hole.

[0006] A method for anchoring a stress-strain intelligent main cable strand anchoring device includes the following steps: Step 1: After the cable strands pass through the anchor, the central smart wire and other round wires are spread out and fixed using a wire splitting plate. A certain gap is left between the cable strands and the inner wall of the anchor for subsequent alloy pouring. Step 2: Cut off all round steel wires except the smart steel wire that pass through the anchorage 10 cm away from the wire dividing plate, leaving only the smart steel wire, leaving a certain distance at the end. Use sandpaper to lightly sand the surface and wipe off the dust. Step 3: Insert the smart wire through the small hole in the tapered outer mold; Step 4: Insert the smart wire through the hole at the small end of the tapered inner mold, ensuring that a certain length of the smart wire is exposed after the tapered inner mold is inserted. Step 5: Pull the tapered outer mold back toward the tapered inner mold so that the tapered inner mold is wedged into the tapered outer mold hole; Step 6: The ejector rod passes through the smart steel wire and screws into the tapered outer mold thread. The tapered outer mold and the ejector rod need to be tightened with a torque of 80-100N, leaving a reserved length of the smart steel wire exposed. Step 7: Use heat insulation material to cover the anchoring device consisting of the conical outer mold, the conical inner mold, and the top rod for heat insulation; Step 8: Place the anchoring device covered with the thermal insulation material between the anchor and the wire dividing plate, then pull the anchor back to the wire dividing plate, keeping the center line of the cable strand aligned with the center line of the anchor. Step 9: Turn on the air compressor and inject cold air through the upper port of the ventilation pipe; Step 10: Hot casting of alloy; when injecting the alloy into the anchor, avoid any vibration, complete the pouring in one go, and allow the anchor to cool to room temperature to eventually form a qualified product.

[0007] The beneficial effects of adopting the above technical solution are: The technical solution of the present invention is applied in the anchoring process of the intelligent main cable strands of the suspension bridge, which can solve the difficult problems of high-temperature protection and synchronous anchoring during preparation. It has a simple structure, is easy to operate, and is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of a stress-strain intelligent main cable strand anchoring device of the present invention.

[0009] Figure 2 for Figure 1 Schematic diagram of the anchoring device after casting.

[0010] Figure 3 for Figure 2 A partial enlarged schematic diagram of the middle anchoring device.

[0011] In the figure: 1-conical outer mold, 2-conical inner mold, 3-mandrel, 4-smart steel wire, 5-ventilation pipe, 6-thermal insulation material, 7-alloy, 8-anchor, 9-wire dividing plate, 10-exhaust hole. DETAILED DESCRIPTION

[0012] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0013] A stress-strain smart main cable strand anchoring device consists of a conical outer mold 1, a conical inner mold 2, and a push rod 3. The conical inner mold 2 is wedged into the hole of the conical outer mold 1. The push rod 3, which is threaded into the conical outer mold 1, applies pressure to secure the anchoring device, protecting the smart steel wire passing through the anchoring device hole. The push rod 3 is also provided with a vent hole 10.

[0014] A method for anchoring a stress-strain intelligent main cable strand anchoring device includes the following steps: Step 1: After the cable strands pass through the anchor 8, the centrally located smart wire 4 and other round wires are spread out and fixed by the wire splitting plate 9. A certain gap is left between the cable strands and the inner wall of the anchor 8 for subsequent alloy 7 pouring. Step 2: Cut off all round steel wires except the smart steel wire 4 that pass through the anchor 8 at a distance of about 10 cm from the wire dividing plate 9, leaving only the smart steel wire 4 with a certain distance left at its end. Lightly sand the surface with sandpaper to remove any dust. Step 3: Thread the smart wire 4 through the small hole of the tapered outer mold 1; Step 4: Insert the smart wire 4 starting from the hole at the small end of the conical inner mold 2, ensuring that a certain length of the smart wire 4 is exposed after the conical inner mold 2 is passed through. Step 5: Pull the tapered outer mold 1 back toward the tapered inner mold 2 so that the tapered inner mold 2 is wedged into the hole of the tapered outer mold 1; Step 6: The ejector rod 3 passes through the smart steel wire 4 and screws into the tapered outer mold 1. The tapered outer mold 1 and the ejector rod 3 need to be tightened with a torque of 80-100N, leaving a reserved length of the smart steel wire 4 exposed. Step 7: Use a heat-insulating material 6 to cover the anchoring device consisting of the conical outer mold 1, the conical inner mold 2, and the top rod 3 for heat insulation; Step 8: Place the anchoring device covered with the heat-insulating material 6 between the anchor 8 and the wire dividing plate 9, and then pull the anchor 8 back to the wire dividing plate 9, keeping the center line of the cable strand aligned with the center line of the anchor 8; Step 9: Turn on the air compressor and inject cold air through the upper port of the ventilation pipe 5; Step 10: Hot casting of alloy 7; when injecting alloy 7 into anchor 8, avoid any vibration and complete the pouring in one go. The anchor 8 is cooled to room temperature to finally form a qualified product.

[0015] The anchoring device composed of a conical outer mold 1, a conical inner mold 2, and a push rod 3 has a minimum inner hole diameter that is approximately larger than the diameter of the smart steel wire 4; the diameter of the center hole in the wire dividing plate 9 is approximately larger than the outer diameter of the anchoring device after being covered with the thermal insulation material 6, so as to facilitate the casting of alloy 7 when the anchoring device is in the anchor 8.

Claims

1. A stress-strain intelligent main cable strand anchoring device, characterized in that: The invention is composed of a conical outer mold (1), a conical inner mold (2), and a push rod (3); the conical inner mold (2) is wedged into the hole of the conical outer mold (1), and the push rod (3) screwed with the thread of the conical outer mold (1) applies pressure to fix the anchor device, thereby protecting the smart steel wire passing through the hole of the anchor device; the push rod (3) is also provided with an exhaust hole (10).

2. The anchoring method of the stress-strain intelligent main cable strand anchoring device according to claim 1, characterized in that: The following implementation steps are also included: Step 1: After the cable strand passes through the anchor (8), the smart steel wire (4) in the middle position and other round steel wires are spread out and fixed by the wire splitting plate (9), and a certain gap is reserved between the cable strand and the inner wall of the anchor (8) for subsequent alloy (7) pouring; Step 2: Cut off all the round steel wires except the smart steel wire (4) that pass through the anchor (8) at a distance of 10 cm from the wire dividing plate (9), leaving only the smart steel wire (4) with a certain distance left at its end. Use sandpaper to lightly sand the surface and wipe off the dust. Step 3: Using the small hole of the tapered outer mold (1) as the starting point, pass the smart wire (4); Step 4: Starting from the hole at the small end of the conical inner mold (2), the smart wire (4) is passed through, and a certain length of the smart wire (4) must be exposed after the conical inner mold (2) is passed through; Step 5: Pull the conical outer mold (1) back toward the conical inner mold (2) so that the conical inner mold (2) is wedged into the hole of the conical outer mold (1); Step 6: The ejector rod (3) passes through the smart steel wire (4) and is screwed into the conical outer mold (1). The conical outer mold (1) and the ejector rod (3) need to be tightened with a torque of 80-100N, and a reserved length of the smart steel wire (4) needs to be exposed. Step 7: Using a heat-insulating material (6) to cover the anchoring device consisting of the conical outer mold (1), the conical inner mold (2), and the top rod (3) for heat insulation; Step 8: Place the anchoring device covered with the heat insulating material (6) between the anchor (8) and the wire dividing plate (9), and then pull the anchor (8) back to the wire dividing plate (9), keeping the center line of the cable strand aligned with the center line of the anchor (8); Step 9: Turn on the air compressor and inject cold air through the upper port of the vent pipe (5); Step 10: hot casting of the alloy (7); when injecting the alloy (7) into the anchor (8), avoid any vibration, and complete the pouring in one go. The anchor (8) is cooled to room temperature, and finally a qualified product is formed.

3. The stress-strain intelligent main cable strand anchoring device according to claim 2, characterized in that: The minimum diameter of the anchor hole must be larger than the diameter of the smart wire (4).

4. The stress-strain intelligent main cable strand anchoring device according to claim 2, characterized in that: The diameter of the center hole in the wire dividing plate (9) is larger than the outer diameter of the anchoring device after being covered with the heat insulating material (6), so as to facilitate the casting of the alloy (7) when the anchoring device is in the anchor (8).

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