Mounting platform supporting leg pressure measuring method

Abstract

A mounting platform supporting leg pressure measuring method includes the steps that a laser range finder is used for measuring the initial height from the lower surface of a supporting leg frame to a ship body steel plate, after measurement is completed, a mechanical jack and an extension pipe are placed on the ship body steel plate below the supporting leg frame, the supporting leg frame is jacked upwards through the mechanical jack, and a supporting leg stand column is completely unloaded; adjusting a lifting screw rod at the bottom of the supporting leg upright post to lift the lifting screw rod relative to the supporting leg upright post, placing a pressure sensor at the bottom of the supporting leg upright post, after the pressure sensor is placed, adjusting the height of the lifting screw rod again to enable the supporting leg upright post to fall back to the pressure sensor, and measuring the height from the bottom of the supporting leg frame to the ship body steel plate by a laser range finder; the height at the moment is ensured to be consistent with the initial height, and the pressure value is recorded. The pressure sensors are small in size, light in weight and flexible in arrangement, the number of the pressure sensors in the cabin can be increased according to construction requirements, and the accuracy of supporting leg pressure measurement values of constructors can be improved.

Description

Technical Field

[0001] The invention belongs to the field of marine ship design and construction, and in particular relates to a method for measuring the pressure of supporting legs of an installation platform. Background Art

[0002] In the existing cargo containment system of MARK Ⅲ LNG carrier, pressure measurement of all supporting legs of the installation platform is required before the construction of the bottom (C side) insulation board and corrugated board. The insulation board and corrugated board can be installed only after the pressure inspection is passed, so as to prevent the insulation board and corrugated board from being damaged by excessive pressure on the supporting legs of the installation platform. However, the original construction method uses a hydraulic jack with a pressure gauge, but the hydraulic jack will frequently leak oil, which will damage the hull steel plate paint and insulation board, and the value of the pressure gauge has a certain error, which will affect the measurement accuracy, and the construction efficiency is also low. Therefore, a method for measuring the pressure of the installation platform is designed to solve the above problems. Summary of the invention

[0003] Since the installation of insulation boards and corrugated boards is one of the key construction processes of the cargo containment system of LNG carriers, the pressure measurement of the installation platform support legs is the core technology for the construction of the cargo containment system of LNG carriers. After many in-depth studies on the installation platform structure, the pressure measurement method of the installation platform support legs was finally optimized.

[0004] In order to solve the above problems, the present invention provides a method for measuring the pressure of the supporting legs of an installation platform, and the technical solution adopted is: A method for measuring the pressure of a mounting platform support leg, wherein the mounting platform support leg is provided with a leg frame, a lifting outer cylinder is arranged at the bottom center of the leg frame, the top of the leg column passes through the lifting outer cylinder and is fixed to the lifting outer cylinder by a latch, a lifting screw rod is arranged at the bottom of the leg column, the lifting screw rod is matched with a short rod, and the lifting screw rod can be moved up and down relative to the leg column by rotating the short rod, the leg column is placed on a hull steel plate, and the leg frame is located at the top of the leg column.

[0005] First, use a laser rangefinder to measure the initial height of the lower surface of the outrigger frame from the hull steel plate. After the measurement, place the mechanical jack and extension tube on the hull steel plate below the outrigger frame. There are two mechanical jacks, located on both sides of the outrigger column. The extension tube is placed between the mechanical jack and the bottom of the outrigger frame. The extension tube is docked with the extended part of the mechanical jack. Use a pressure rod to adjust the extension of the mechanical jack, and lift the outrigger frame and the outrigger column upward until the outrigger column is completely unloaded. Use a short rod to rotate the installation. Install the lifting screw of the platform outrigger column so that the pressure sensor can be smoothly placed on the hull steel plate below the outrigger column. Adjust the height of the lifting screw again to make the outrigger column fall back onto the pressure sensor. When the outrigger column completely falls back to the pressure sensor, remove the mechanical jack and extension tube, and use a laser rangefinder to measure the height from the bottom of the outrigger frame to the hull steel plate to ensure that the height is consistent with the initial height. The value displayed by the pressure sensor is the pressure value of the installation platform support leg, and the pressure value and height are recorded.

[0006] After recording, place the mechanical jack and extension tube on the hull steel plate below the outrigger frame, extend the pressure rod of the mechanical jack upward, lift the outrigger column and the outrigger frame upward, take out the pressure sensor after the outrigger column is separated from the slipway steel plate, use the short rod to adjust the height of the lifting screw again, retract the pressure rod of the mechanical jack, and make the outrigger column and the outrigger frame fall back to the hull steel plate. When the outrigger column is completely supported by the hull steel plate, remove the mechanical jack, and use a laser rangefinder to measure the distance between the lower surface of the outrigger frame and the hull steel plate to ensure that the distance at this time is consistent with the initial height.

[0007] The above-mentioned method for measuring the pressure of the support legs of the installation platform, further, the support leg column is composed of a lifting screw rod and a column body, the column body is vertically arranged, the bottom is fixedly connected to the lifting screw rod, and the lifting screw rod is matched with a short rod.

[0008] The above-mentioned method for measuring the pressure of the supporting legs of the mounting platform further comprises: plywood and plastic sheeting are arranged at the bottom of the mechanical jack, the bushing steel plate is covered with plastic sheeting, and the plywood is placed on the plastic sheeting.

[0009] The above-mentioned method for measuring the pressure of the supporting legs of the installation platform further comprises: a transverse through hole is opened on the lifting outer cylinder, and a transverse through hole is opened on the top of the leg column. The pins are inserted into the through holes of the lifting outer cylinder and the through holes of the leg column in sequence to fix the leg column and the leg frame.

[0010] The above-mentioned method for measuring the pressure of the supporting legs of the mounting platform further comprises a pressure sensor pad being placed at the bottom of the pressure sensor.

[0011] The above-mentioned method for measuring the pressure of the support legs of the mounting platform further comprises: when the support leg columns fall back to the hull steel plate, the bottoms of the support leg columns are padded with calibration plates.

[0012] The beneficial effects of the present invention are: The present invention provides a method for measuring the pressure of an installation platform. The pressure sensor used in the scheme is small in size and light in weight and can be arranged at all supporting leg positions of the installation platform. The arrangement is flexible. Therefore, the accuracy of the supporting leg pressure measurement value can be improved by increasing the number of pressure sensors in the cabin and increasing the number of construction personnel according to construction requirements.

[0013] 2 The method for measuring the pressure of an installation platform provided by the present invention can be arranged near the construction site, thereby reducing the inaccuracy of the measurement values ​​of the original scheme and reducing the probability of excessive pressure on individual supporting legs.

[0014] 3 The installation platform pressure measurement method provided by the present invention is easy to understand. After simple training for construction personnel, the construction personnel can master the construction method of pressure measurement and related construction requirements, provide theoretical support for the correct support leg pressure measurement, and improve the accuracy of the support leg pressure measurement method. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 to Figure 9 It is a schematic diagram of the pressure measurement process of the present invention; Among them: 1-lifting outer cylinder, 2-latch pin, 3-leg frame, 4-leg column, 5-lifting screw, 6-plywood, 7-hull steel plate, 8-extension pipe, 9-mechanical jack, 10-plywood, 11-short rod, 12-pressure sensor pad, 13-pressure sensor. DETAILED DESCRIPTION

[0016] The present invention will be further described in conjunction with the accompanying drawings.

[0017] A method for measuring the pressure of a support leg of an installation platform, wherein the support leg of the installation platform is composed of a support leg frame, a latch, a support leg column, and a lifting outer cylinder, wherein the lifting outer cylinder is a part of the main structure of the installation platform, and the support leg column can be extended and retracted up and down relative to the lifting outer cylinder to realize the support leg lifting function, and the lifting screw rod can adjust the total length of the support leg column by a certain amount. The support leg column is composed of a lifting screw rod and a column body, the column body is vertically arranged, and the bottom is fixedly connected to the lifting screw rod, and the lifting screw rod is matched with a short rod.

[0018] To ensure the accuracy of the pressure measurement on the installation platform, the specific operation methods are as follows: Before pressure measurement, first use a laser rangefinder to measure the initial height of the lower surface of the outrigger frame from the hull steel plate, and then vertically place the plastic sheet, plywood, mechanical jack, and extension tube on both sides of the outrigger column below the non-hollow area of ​​the outrigger frame structure, ensuring that the mechanical jacks and extension tubes on both sides of the installation platform are parallel to the outrigger column. After the plywood, mechanical jack, and extension tube are in place, the mechanical jacks on both sides of the outrigger column use the jack pressure rods to adjust the extension of the mechanical jacks at the same time, evenly, and slowly until the outrigger column is completely unloaded. By using a short rod to rotate the outrigger column, the mechanical jacks on both sides of the outrigger column are adjusted. The lifting screw of the leg column, place the plastic sheet, plywood, pressure sensor pad, and pressure sensor in the middle position below the leg column in sequence. After they are in place, use the short rod to adjust the height of the lifting screw again until you feel it is strong, stop adjusting, and use the jack pressure rod to unload the mechanical jack. After the mechanical jack is completely unloaded, use the laser rangefinder again to measure the initial height of the lower surface of the leg frame from the hull steel plate to ensure that the height of the leg column is consistent with the height of the leg column when the pressure sensor is not placed. At this time, the value displayed by the pressure sensor is the pressure value of the support leg of the installation platform.

[0019] After the pressure measurement is completed, the plywood, mechanical jack and extension tube are placed in the non-hollow position of the outrigger frame structure in the same way. At the same time, use the jack pressure rod to adjust the extension of the mechanical jack evenly and slowly. After the outrigger column is unloaded, the pressure sensor pad and pressure sensor are taken out by adjusting the lifting screw of the installation platform outrigger column. Use the short rod to adjust the height of the lifting screw again, and use the jack pressure rod to unload the mechanical jack. Use the laser rangefinder to measure the initial height of the lower surface of the outrigger frame from the hull steel plate and the distance from the hull steel plate to ensure that the height reaches the height when the pressure sensor is not placed.

Claims

1. A method for measuring the pressure of a mounting platform support leg, characterized in that: The mounting platform support leg is provided with a leg frame, a lifting outer cylinder is arranged at the bottom center of the leg frame, the top of the leg column passes through the lifting outer cylinder, and is fixed to the lifting outer cylinder by a latch, a lifting screw rod is arranged at the bottom of the leg column, the lifting screw rod is matched with a short rod, and the lifting screw rod can move up and down relative to the leg column by rotating the short rod, the leg column is placed on the hull steel plate, and the leg frame is located at the top of the leg column; First, use a laser rangefinder to measure the initial height of the lower surface of the outrigger frame from the hull steel plate. After the measurement, place the mechanical jack and extension tube on the hull steel plate below the outrigger frame. There are two mechanical jacks, located on both sides of the outrigger column. The extension tube is placed between the mechanical jack and the bottom of the outrigger frame. The extension tube is docked with the extended part of the mechanical jack. Use a pressure rod to adjust the extension of the mechanical jack, and lift the outrigger frame and the outrigger column upward until the outrigger column is completely unloaded. Use a short rod to rotate the installation. Install the lifting screw of the platform outrigger column so that the pressure sensor can be smoothly placed on the hull steel plate below the outrigger column. Adjust the height of the lifting screw again so that the outrigger column falls back onto the pressure sensor. When the outrigger column completely falls back to the pressure sensor, remove the mechanical jack and extension tube, and use a laser rangefinder to measure the height from the bottom of the outrigger frame to the hull steel plate to ensure that the height is consistent with the initial height. The value displayed by the pressure sensor is the pressure value of the installation platform support leg, and the pressure value and height are recorded; After recording, place the mechanical jack and extension tube on the hull steel plate below the outrigger frame, use the mechanical jack pressure rod to adjust the extension of the mechanical jack, lift the outrigger column and the outrigger frame upwards, and after the outrigger column is completely unloaded, take out the pressure sensor, use the short rod to adjust the height of the lifting screw again, use the short rod to rotate the lifting screw to make the outrigger column fall back to the hull steel plate, when the outrigger column completely falls on the hull steel plate, remove the mechanical jack and extension tube tooling, use the laser rangefinder to measure the distance between the lower surface of the outrigger frame and the hull steel plate to ensure that the distance at this time is consistent with the initial height.

2. A method for measuring the pressure of a mounting platform support leg according to claim 1, characterized in that: The leg column is composed of a lifting screw rod and a column body. The column body is vertically arranged, and the bottom is fixedly connected to the lifting screw rod. The lifting screw rod is matched with a short rod.

3. A method for measuring the pressure of a mounting platform support leg according to claim 1, characterized in that: Plywood and plastic sheeting are arranged at the bottom of the mechanical jack, plastic sheeting is laid on the bushing steel plate, and plywood is placed on the plastic sheeting.

4. A method for measuring the pressure of a mounting platform support leg according to claim 1, characterized in that: A transverse through hole is opened on the lifting outer cylinder, and a transverse through hole is opened on the top of the leg column. The latch is inserted into the through hole of the lifting outer cylinder and the through hole of the leg column in sequence to fix the leg column and the leg frame.

5. A method for measuring the pressure of a mounting platform support leg according to claim 1, characterized in that: A pressure sensor pad is placed at the bottom of the pressure sensor.

6. A method for measuring the pressure of a mounting platform support leg according to claim 1, characterized in that: When the outrigger columns fall back to the hull steel plate, a calibration plate is placed at the bottom of the outrigger columns.

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