Cable holder for lifting main cable strand in saddle

Abstract

The invention relates to the technical field of suspension bridge cable saddle installation equipment, in particular to a cable holder for lifting a main cable strand in a saddle, which comprises a first component and a second component which are formed by processing a rectangular forged steel blank, a lug plate is integrally formed on the first component in a material removal mode, the lug plate is located on the central axis of the first component, and the second component is located on the middle axis of the second component. The second component is formed by machining a rectangular plate with the side face removed from the lug plate, a first groove is formed in the first component in the length direction of the first component, a second groove is formed in the second component in the length direction of the second component, and the face where the first groove of the first component is located is attached to the face where the second groove of the second component is located. The first component and the second component are fixed through bolts and nuts. The technical problems that a large amount of welding exists on a cable holder in the prior art, and when a cable is pulled in a large-span suspension bridge, a pin shaft, a high-friction lining and a welding structure on the cable holder are prone to loosening and breakage are solved.

Description

Technical Field

[0001] The invention relates to the technical field of cable saddle installation equipment for suspension bridges, in particular to a cable gripper for lifting a main cable strand into a saddle. Background Art

[0002] A suspension bridge is a bridge that uses suspended cables as the main load-bearing member. The load-bearing method is to use cables to pull up the weight of the bridge. From the perspective of force, the cables are subjected to axial tension to resist external loads. Therefore, the strength of the cable steel can be fully utilized. The cables are composed of multiple high-strength steel wires with extremely high tensile strength. They can withstand huge tensile forces, which enables suspension bridges to span long distances. Therefore, suspension bridges, with their unique structure and advantages, occupy an important position in modern bridge engineering.

[0003] The main load-bearing component of a suspension bridge is the cable, which is composed of many strands. The strands are usually transported to the construction site. The strands must first be suspended and towed to the other side of the bridge through the cable tower and anchored on both sides. When the strands are just towed to the other side, they fall directly on the catwalk. The strands need to be lifted and pulled into the saddle. The winch on the main tower uses the cable grip to pull the strands locally for a short distance, adjust the preload, pull the strands into the saddle, and integrate multiple strands into a hexagonal cable. Finally, the cable is anchored. Since the cable is a very important load-bearing component, it is necessary to avoid damage to the strands during the erection, preload and anchoring process. However, when using a cable grip to pull the cable, relative sliding often occurs between the cable grip and the cable, and the relative sliding causes friction damage to the cable strands on the cable surface. Therefore, a wedge-shaped structure is usually used in the prior art to avoid the relative friction between the cable and the cable grip. For example, the patent document with application number: CN201921205802.0 discloses a lightweight cable grip for main cable construction, which includes a first body and a second body, wherein a first groove and a second groove are respectively provided in the first body and the second body, and a closed-loop through hole formed by merging the first groove and the second groove is used as a connecting hole between the cable grip and the cable strand, and a high-friction bushing is provided in the closed-loop through hole. The high-friction bushing is used to reduce the weight of the cable grip while ensuring sufficient friction, thereby improving the controllability of the safety hazard of the cable grip slipping.

[0004] Although the above patent can reduce the weight of the cable grip and the probability of relative sliding of the cable, the lifting pin is set horizontally and fixed by nuts due to the design of the lifting pin and high friction bushing. However, when lifting the cable strand, the traction force is not in the same straight line as the cable strand, and the movement of the cable strand also involves left and right swings during the process of saddle-fitting and adjusting the cable strand and pulling the cable strand. Therefore, during the pulling process of the cable strand, the cable grip is also subjected to a certain flow force. The weight of the pulling cable is large, and the lifting pin is prone to sliding when lifting and straightening the cable strand. In the prior art, the extension ear plate connecting the cable grip and the lifting pin is usually welded. Although the welding structure is simple, the material can be fully utilized, and the processing efficiency is high, the welding part is prone to cracking in the face of the complex stress of the cable grip. Therefore, it is necessary to check the internal structure of the cable grip in a timely and regular manner to eliminate safety hazards in a timely manner. Summary of the invention

[0005] The object of the present invention is to provide a cable grip for lifting the main cable strand into the saddle, so as to solve the technical problems mentioned above that there are a large number of welds on the cable grip in the prior art, and when the cable is pulled in a large-span suspension bridge, the pin shaft, high-friction bushing and welding structure on the cable grip are easy to loosen and break.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is as follows: a main cable strand is inserted into a cable grip for saddle lifting, comprising a first component and a second component processed from a rectangular forged steel billet, an ear plate is integrally formed on the first component by removing material, the ear plate is located on the central axis of the first component, and the second component is processed from a rectangular plate removed from the side of the ear plate, the first component has a first groove along its length direction, the second component has a second groove along its length direction, the surface where the first groove of the first component is located is in contact with the surface where the second groove of the second component is located, and the first component and the second component are fixed by bolts and nuts.

[0007] The beneficial effects of this embodiment are:

[0008] 1. The ear plates on traditional cable grips are usually welded. Although the welding structure is simple, the material can be fully utilized, and the processing efficiency is high, the welding parts are prone to cracking in the face of the complex stress conditions of the cable grip. Therefore, it is necessary to check the internal structure of the cable grip in a timely and regular manner to eliminate safety hazards in a timely manner. However, the present application directly machines and turns the overall structure, so there is no welding structure of the ear plate. Therefore, compared with the existing technology, it is not easy to break, and its quality is more reliable when pulling cables in large-span suspension bridges.

[0009] 2. In the prior art, the first and second extension bodies are arranged on the first body and the second body, and a pin shaft is arranged between the first and second extension bodies as a lifting position. If integrated processing is performed, a large amount of forged steel needs to be turned due to the mechanism of merging the first body and the second body on the left and right, and the turned material is too fragmented to be utilized, resulting in a large amount of material waste. However, the present application utilizes a first member processed from a rectangular forged steel billet, and an ear plate is integrally formed on the first member by removing material. Since a bolt connection position is provided on the side of the ear plate, the thickness of the rectangular plate removed from the side of the ear plate is sufficient to process the second member. Therefore, it is utilized as the processing material of the second member. Compared with the prior art, the material can be fully utilized, thereby reducing the production cost of the rope gripper.

[0010] Furthermore, a displacement sensor and a pressure sensor are provided on the mating surfaces of the first component and the second component. When the cable gripper is used to pull and straighten the cable, the cable is mainly pulled by the friction between the cable gripper and the cable. When the friction is less than the force required for the cable to be pulled and straightened, relative sliding occurs between the cable and the cable gripper. In order to avoid such relative sliding, in the prior art, high friction bushings and wedge structures are usually provided to enhance the friction between the two. Although this method can reduce the probability of relative sliding to a certain extent, in fact, when the friction of the cable gripper is less than the force required for pulling and straightening, unpredictable relative sliding will occur regardless of whether there is a friction-enhancing structure on the cable gripper. Therefore, for the problem of relative sliding between the cable and the cable gripper, attention should be paid to the friction itself, and the friction is related to the positive pressure. Theoretically, as long as the cable gripper provides sufficient positive pressure on the cable, the friction between the cable and the cable gripper can be infinitely increased. Therefore, instead of setting up a structure that increases the risk of breakage to strengthen the friction, it is better to monitor the friction itself to ensure that the maximum static friction between the cable gripper and the cable is always greater than the force required for the cable to be pulled and straightened, so as to ensure that no relative sliding occurs. Based on this concept, the present application is provided with a pressure sensor and a displacement sensor in the cable gripper to detect the friction condition between the cable and the cable strand bayonet in the cable gripper, and to ensure that the maximum static friction between the cable strand bayonet and the cable is always greater than the force required for the cable to be pulled and straightened during the traction process. Compared with the prior art, there will be no unpredictable relative sliding.

[0011] Furthermore, a first detection port is provided in the second groove, a displacement sensor is installed in the first detection port, a second detection port is provided on the surface where the second groove of the second member is located, and a pressure sensor is installed in the second detection port. The biggest problem with setting a pressure sensor and a displacement sensor in the cable grip is the location of the setting. Since the pressure sensor needs to be in contact for detection, it is installed in the groove where the cable and the cable grip are directly squeezed, and its detection is most accurate. However, when the cable is installed in the cable grip, the cable will slide in the groove. If the pressure sensor is installed in the cable strand bayonet formed by the groove, the cable will slide when it slides, which will cause damage to the sensor, making its detection inaccurate. In this regard, the present application analyzes the entire cable grip and finds that the pressure between the cable and the cable grip is provided by the bolts on the cable grip. The pressure on the contact surface between the cable and the cable grip groove is strongly correlated with the pressure on the fitting surface of the groove edge. Therefore, the present application cleverly installs it on the fitting surface beside the first groove and the second groove, converts the pressure on the fitting surface into the pressure on the contact surface between the cable and the cable grip groove, avoids damage to the pressure sensor, and obtains positive pressure monitoring data.

[0012] Furthermore, the first detection port and the second detection port are both arranged at either end or both ends of the second component.

[0013] Furthermore, the pressure sensor and the displacement sensor are both electrically connected to a signal transmitter that can transmit the pressure data and the displacement data to the terminal device.

[0014] Furthermore, the terminal device for transmitting signals from the signal transmitter includes a terminal computer, and the terminal computer includes an alarm module, a time module and a data comparison module; the alarm module is used to control the color of the terminal computer screen and whether to issue an alarm sound; the time module is used to time and generate the time for receiving pressure data and displacement data; the data comparison module is used to compare the pressure data and displacement data with preset parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention,

[0016] Figure 2 for Figure 1 A partial enlarged view of

[0017] Figure 3 It is a plan view of the circuit installation cavity of the present invention.

[0018] Figure 4 It is a logic block diagram of the intelligent alarm of the present invention. DETAILED DESCRIPTION

[0019] The following is further described in detail through specific implementation methods:

[0020] The figure marks in the drawings of the specification include: a first component 1, a first groove 11, a second component 2, a second groove 21, a first detection port 211, an ear plate 3, a traction hole 31, a pre-tightening connection hole 4, a pre-tightening bolt 41, a pre-tightening nut 42, a pressure sensor 511, a displacement sensor 52, a signal transmitter 53, a battery 54, and a line channel 55.

[0021] Implementation example Figure 1-4 As shown: the main cable strand entering the saddle lifting cable gripper includes a first component 1, the first component 1 is provided with a lug plate 3, the lug plate 3 and the first component 1 are made of thick plates of high-strength steel, and are integrally formed after machining to remove excess steel on the thick plate. In other words, the lug plate 3 and the first component 1 are an integral structure without any connection. During the processing, the thick plate needs to cut off excess steel on both sides of the lug plate 3, and the entire plate is cut off to ensure that the high-strength steel cut off is also a plate structure, and it is used as the production material of the second component 2.

[0022] A traction hole 31 is formed on the ear plate 3 of the first member 1, and the traction hole 31 is used to connect with a winch when traction of a cable. A first groove 11 is formed on the opposite side of the ear plate 3 of the first member 1 along the length direction of the first member 1, and a second groove 21 is formed on the second member 2 along the length direction of the second member 2. The first groove 11 and the second groove 21 have completely identical structures, and both are isosceles trapezoids with equal short sides and waists in cross-section. Therefore, when the surface where the first groove 11 of the first member 1 is located is fitted with the surface where the second groove 21 of the second member 2 is located, the first groove 11 and the second groove 21 form a regular hexagonal cable bayonet, so that the cable bayonet fits the hexagonal cross-section of the cable.

[0023] A plurality of pre-tightening connection holes 4 penetrating the first component 1 and the second component 2 are provided on both sides of the first groove 11 and the second groove 12. After the surface of the first component 1 where the first groove 11 is located is fitted with the surface of the second groove 21 of the second component 2, the pre-tightening connection holes 4 on the first component 1 and the second component 2 are just aligned. Therefore, pre-tightening bolts 41 can be used to pass through the pre-tightening connection holes 4 of the first component 1 and the second component 2, and the pre-tightening nuts 42 can be used to fix them as a whole.

[0024] Select any one of the first component 1 and the second component 2, and open a detection port on the end of both ends thereof, the detection port includes a first detection port and a second detection port. Taking the second component 2 as an example, the first detection port is a groove opened downward on the bottom surface of the second groove 21, and a displacement sensor 52 is installed in the groove. The displacement sensor 52 uses a non-contact Hall displacement sensor. When installing, pay attention to the depth of the first detection port to ensure that after the displacement sensor 52 is installed, the upper top surface of the displacement sensor 52 is lower than the bottom surface of the second groove 21, so as to avoid damage to the displacement sensor caused by the cable. On the fitting surface beside the second groove 21, a second detection port is set downward, and a pressure sensor 51 is set at the second detection port. When installing, ensure that the pressure sensor is flush with the fitting surface to ensure the detection accuracy of the pressure sensor 51.

[0025] The pressure sensor 51 and the displacement sensor 52 are both electrically connected to the signal transmitter 53 through the line channel 55. The signal transmitter 53 is arranged on the side of the second component 2, and the signal transmitter 53, the pressure sensor 51 of the signal transmitter 53 and the displacement sensor 52 are all electrically connected to the power supply 54 on the back of the second component 2 through the line channel 55. The signal transmitter 53 has a built-in Bluetooth module, so the Bluetooth module can be used to transmit the data detected by the pressure sensor 51 and the displacement sensor 52 to the terminal computer, so that the technicians can collect the data during the traction process of the cable gripper and the cable, analyze it by computer, better plan the traction process, and ensure that the friction between the cable gripper and the cable is greater than the pulling force of the traction cable.

[0026] The terminal computer can be provided with a data comparison module, an alarm module, and a time module. The data comparison module can compare the collected pressure data with the preset pressure parameters, and control the alarm module to send an alarm signal on the terminal computer according to the comparison result.

[0027] When used, it is divided into two stages:

[0028] In the first stage, when installing the cable in the cable gripper, the cable is installed in the cable bayonet, and the first component 1 and the second component 2 are fixed together by the pre-tightening bolt 41 and the pre-tightening nut 42. The pre-tightening bolt 41 and the pre-tightening nut 42 are tightened to gradually increase the pressure on the fitting surface of the first component 1 and the second component 2, so as to provide sufficient positive pressure for the cable. In this process, the pressure sensor 51 transmits the pressure data to the signal transmitter 53. The signal transmitter 53 uses its Bluetooth module to transmit all the detected parameters to the terminal computer for analysis by the technician. The technician uses the data comparison module of the terminal computer to compare the detected pressure data with the preset pressure parameters of the technician. If the preset pressure has not been reached, the result is directly transmitted to the alarm module. The alarm module controls the screen on the terminal computer to be yellow and does not make a sound. When the terminal device receives the pressure data and reaches the preset pressure parameter, the time module starts timing. If the detected pressure remains unchanged for 15 seconds, the alarm module controls the terminal computer screen to turn green and emits a sound of pre-tightening completion through the terminal computer.

[0029] In the second stage, when traction begins, the pressure sensor 51 transmits the detected pressure data to the signal transmitter 53 once every 0.5s. The signal transmitter 53 uses the Bluetooth module to transmit all the detected pressure parameters and pressure parameter detection time data to the terminal computer for analysis by the technicians. At the same time, the technicians use the data comparison module of the terminal computer to compare the pressure data transmitted this time with the pressure data of the previous time. If the comparison is consistent (within the preset fluctuation range), the terminal computer screen remains green; if the comparison is inconsistent (less than the lower limit of the preset fluctuation range), the terminal computer screen turns yellow and continuously emits an alarm sound to remind the engineer that the cable gripper has pressure attenuation, and it is necessary to detect whether the pre-tightening bolt 41 and the pre-tightening nut 42 are loose. The pre-tightening bolt 41 and the pre-tightening nut 42 need to be tightened to provide sufficient positive pressure. At the same time as the alarm, the pressure parameter is compared with the preset pressure in the first stage. When it is greater than the preset pressure, the terminal computer maintains the yellow alarm state; when it is less than the preset pressure, the terminal computer screen turns red and continuously emits a harsh alarm sound.

[0030] The displacement sensor 52 detects whether displacement occurs and records the displacement length data. When the displacement sensor 52 detects displacement, the displacement parameter is transmitted to the signal transmitter 53. The signal transmitter 53 transmits the displacement data to the terminal computer using the Bluetooth module, so that the technician can analyze the relative sliding in combination with the pressure data. At the same time, the alarm module controls the terminal computer screen to turn red and continuously emits a harsh alarm sound to remind the user of the relative sliding abnormality. The user can not only continue the traction, but also avoid a bigger accident.

[0031] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A cable gripper for lifting the main cable strand into the saddle, characterized by: The invention comprises a first component and a second component which are processed from rectangular forged steel blanks. An ear plate is integrally formed on the first component by removing material. The ear plate is located on the central axis of the first component. The second component is processed from a rectangular plate removed from the side of the ear plate. The first component has a first groove along its length direction, and the second component has a second groove along its length direction. The surface where the first groove of the first component is located is in contact with the surface where the second groove of the second component is located. The first component and the second component are fixed by bolts and nuts.

2. The main cable strand lifting cable gripper according to claim 1, characterized in that: A displacement sensor and a pressure sensor are provided on the fitting surfaces of the first component and the second component.

3. The main cable strand lifting cable gripper according to claim 2, characterized in that: A first detection port is formed in the second groove, and a displacement sensor is installed in the first detection port; a second detection port is formed on the surface where the second groove of the second member is located, and the pressure sensor is installed in the second detection port.

4. The main cable strand lifting cable gripper according to claim 3, characterized in that: The pressure sensor and the displacement sensor are both electrically connected to a signal transmitter that can transmit pressure data and displacement data to a terminal device.

5. The main cable strand lifting cable gripper according to claim 4, characterized in that: The first detection port and the second detection port are both arranged at either end or both ends of the second component.

6. The cable gripper for lifting the main cable strand into the saddle according to claim 5, characterized in that: The terminal device for transmitting signals by the signal transmitter includes a terminal computer, and the terminal computer includes an alarm module, a time module and a data comparison module; Alarm module: used to control the color of the terminal computer screen and whether to sound an alarm; Time module: used for timing and generating the time of receiving pressure data and displacement data; Data comparison module: used to compare pressure data and displacement data with preset parameters.

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