An integral installation method for a pilot door of a large container ship at the hull segmentation stage

Abstract

The present invention discloses a method for integrally installing a pilot door of a large container ship at the hull segmentation stage, wherein the door frame and door plate of the pilot door are closed in a workshop and subjected to a watertightness test, and then hoisted and welded in place as a whole at the hull segmentation stage. The method can make the pilot door frame and the door deform in the same manner, ensure that the pilot door is watertight in the closed state, and integrally install the pilot door at the hull segmentation stage, and can be assisted by a crane, thereby reducing the workload of the installation and improving the safety of the pilot door installation.

Description

Technical Field

[0001] The invention belongs to the field of shipbuilding, and in particular relates to a method for integrally installing a pilot door of a large container ship on a hull in stages and sections. Background Art

[0002] The pilot door is an important equipment of the ship. It is the switch device at the entrance of the pilot station of the ship. The pilot door of a large container ship has large dimensions and weight, so the pilot door is installed with the door frame first, and then the door panel, guide rail and bracket. This installation method is time-consuming and laborious. If the door frame is installed first and then the door panel is installed, the deformation of the door frame and the door will be inconsistent, which will eventually lead to the pilot door being unable to close to a watertight state. In order to make the installation of the pilot door more convenient and ensure that the door and the door frame can reach a watertight state when closed, the pilot door needs to be installed as a whole. After the overall installation, the deformation of the door and the door frame will be the same, and there will be no gap. However, after the hull is fully loaded, due to the overall weight of the pilot door and the installation position, equipment such as cranes cannot assist in the installation, so the overall installation of the pilot door cannot be achieved for the time being. In the prior art, Chinese utility model patent 201920419165.0 discloses a stable guided ship pilot door, including a door frame outer panel installed on the hull, a door opening and closing cylinder installed on the door frame outer panel, a single guide rail installed on the hull, and a door panel installed between two single guide rails through a pulley; it also includes a rocker arm structure and a mounting bracket. The pilot door frame and door panel, guide rail and bracket of the utility model are installed separately, and tools such as hoists are needed to gradually install the door and bracket in place. The space for the pilot station is limited, and the installation process is prone to safety accidents. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a method for integrally installing a pilot door of a large container ship at the hull segmentation stage. The pilot door is integrally installed at the hull segmentation stage, which can ensure that the pilot door frame and the door have consistent deformation, thereby ensuring that the water tightness of the pilot door is not damaged due to inconsistent deformation. At the same time, since the pilot door is integrally installed at the segmentation stage, a crane can assist in the installation, so the workload can be reduced, and the safety is also effectively improved.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for integrally installing a pilot door of a large container ship at a hull segmentation stage, wherein the pilot door is installed on a hull segmentation outer plate above the waterline of the large container ship, the pilot door structure comprises a door frame, a door plate, an upper guide rail, a lower guide rail, a pulley frame and a hydraulic system, the door frame of the pilot door is connected to a steel surrounding wall of the hull segmentation outer plate, the door plate matches the door frame, an upper guide rail is installed above the door frame, and a lower guide rail is installed below the door frame, a pulley frame is provided on the door plate, the door plate is connected to the upper guide rail and the lower guide rail of the door frame through the pulley frame, the hydraulic system is fixedly installed on the door plate, the pulley frame cooperates with the upper guide rail and the lower guide rail to drive the door plate to move to open and close the pilot door, the method comprises the following steps:

[0006] S1. Determine the center point "O" of the opening on the outer plate of the hull segment, draw a horizontal line AB with the center point "O", and then draw a perpendicular line CD with the center point "O" as the intersection point;

[0007] S2. Based on the AB and CD lines, the opening lines are drawn based on the parallel lines of AB and CD according to the size of the opening, and the opening is then made. The unevenness of the surface around the opening of the hull segment outer plate is less than 1mm / m, and the diagonal deviation of the opening is less than 1.5mm / m;

[0008] S3. After the hull segment outer plate is opened, check the matching clearance between the door frame and the hull segment outer plate opening, and the clearance on one side is 4mm-6mm;

[0009] S4. Fix the pilot door as a whole on a special installation base, wherein the special installation base includes three supporting points, the lower ends of the three supporting points are welded to a steel structure base formed by splicing angle steels, and spiral supporting heads with adjustable heights are provided above the supporting points. By adjusting the spiral supporting heads, the three supporting points are made to be on the same plane to control the overall installation accuracy of the pilot door. The four corners of the door frame are kept in a horizontal state, and a positioning block is installed on each side of the door frame to position the hull section where the pilot door is located.

[0010] S5, lifting the hull section where the pilot door is located, aligning the center of the opening on the outer plate of the hull section with the center of the pilot door, slowly lowering the hull section and placing it on the positioning block, adjusting the distance between the edge of the pilot door frame and the edge of the opening on the outer plate of the hull section, so that the gap between the door frame and the opening of the hull outer plate meets the requirements of step S3;

[0011] S6. Adjust the hull section outer plate and the door frame of the pilot door to be on the same horizontal plane, fix them by intermittent welding, and after the intermittent welding is completed, perform continuous welding to complete the welding of the pilot door and the hull outer plate.

[0012] According to a further preferred technical solution, in step S2, the size of the opening of the hull section outer plate is 10 mm larger than the outer dimension of the door frame, and the size deviation of the opening of the hull section outer plate is less than 1.5 mm / m.

[0013] According to a further preferred technical solution, in step S4, the pilot door frame and the door panel need to be in a closed state before being installed as a whole.

[0014] According to a further preferred technical solution, in step S4, the pilot's door frame and the door panel are subjected to a water tightness test before overall installation.

[0015] A further preferred technical solution is that in step S6, the intermittent weld has no less than 16 sections around it, the intermittent weld length is 50 mm, and the intermittent weld adopts a staggered cross welding method.

[0016] According to a further preferred technical solution, in step S6, the maximum welding length of the continuous welding is less than 300 mm, and the continuous welding is performed by staggered cross welding.

[0017] According to a further preferred technical solution, the door frame and the hull segment outer plate are connected by a welding method of opening a V-shaped groove and single-sided welding and double-sided forming.

[0018] The overall installation method of a pilot door of a large container ship in the hull segmentation stage of the present invention has been applied in practice in ship construction and has achieved the following technical effects:

[0019] 1. The present invention provides an overall installation method for a pilot door of a large container ship at the hull segment stage, which adopts a method of first fixing the pilot door and then hoisting the hull segment, providing a reference for the installation of large equipment in the subsequent ship construction process.

[0020] 2. The present invention provides an overall installation method for a pilot door of a large container ship at the hull segment stage. Compared with the traditional method of installing the pilot door frame after the hull segments are closed, the present method advances the installation process, which can not only reduce the workload of ship construction, but also can be assisted by a crane.

[0021] 3. The present invention provides an integral installation method for a pilot door of a large container ship at the hull segmentation stage, which avoids inconsistent deformation caused by separate installation of the pilot door frame and the door panel. Inconsistent deformation may result in the pilot door being unable to be closed to a watertight state, affecting the safety of the ship's navigation.

[0022] 4. The present invention provides an integral installation method of a pilot door of a large container ship at the hull segmentation stage. The integral installation of the pilot door frame, door plate and accessories can facilitate the early installation of hydraulic pipes and door closing devices, thereby advancing the functional test and shortening the ship construction period;

[0023] 5. The present invention provides an integral installation method for a pilot door of a large container ship at the hull segmentation stage. The integral installation of the pilot door improves the safety of the installation process of the large equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of a pilot door structure of a large container ship pilot door in the overall installation method of the present invention at the hull segmentation stage

[0026] Figure 2 The present invention is a schematic diagram of the overall structure of a method for overall installation of a pilot door of a large container ship at a hull segmentation stage.

[0027] Figure 3 The present invention is a schematic diagram of a hole opening method for an overall installation method of a pilot door of a large container ship at a hull segmentation stage.

[0028] Figure 4 The present invention is a method for integrally installing a pilot door of a large container ship in the hull segmentation stage. Figure 2 Schematic side view of .

[0029] Figure 5 The present invention is a schematic diagram of a positioning block of a method for integrally installing a pilot door of a large container ship at a hull segmentation stage.

[0030] Figure 6 The present invention is a schematic diagram of the welding method of an overall installation method of a pilot door of a large container ship at the hull segment stage.

[0031] The numbers in the figure represent:

[0032] 1-door frame, 2-door panel, 3-upper guide rail, 4-lower guide rail, 5-pulley frame, 6-positioning block. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Traditional pilot doors are installed after the hull sections are closed, so there is no way to use a crane to assist. The pilot doors of large container ships are heavy, with door frames weighing more than 2 tons and door panels weighing more than 4 tons. Without a crane, the welding workload of the door frames and the installation of the door panels are both technically difficult.

[0035] The present invention discloses a method for integrally installing a pilot door of a large container ship at a hull segmentation stage. The pilot door described in the method is installed on the outer plate of the hull segment above the waterline of the large container ship. Figure 1 As shown, its structure includes a door frame 1, a door panel 2, an upper guide rail 3, a lower guide rail 4, a pulley frame 5 and a hydraulic system. The door frame 1 of the pilot door is connected to the steel surrounding wall of the hull segment outer plate, the door panel 2 is matched with the door frame 1, the upper guide rail is installed above the door frame 1, and the lower guide rail is installed below the door frame 1. The pulley frame 5 is provided on the door panel 2, and the door panel 2 is connected to the upper guide rail 3 and the lower guide rail 4 of the door frame 1 through the pulley frame 5. The hydraulic system is fixedly installed on the door panel 2, and the pulley frame 5 cooperates with the upper guide rail 3 and the lower guide rail 4 to drive the door panel 2 to move sideways to open and close the pilot door. The method includes that when the hull is divided into sections, the installation position of the pilot door must be ensured to be within a section, so as to avoid the occurrence of cross welds at the installation position of the pilot door, which increases the difficulty of installation. The hull section where the pilot door is located, the position of the pilot door is installed according to the size of the door frame, first drill a hole, the hole size is 10mm larger than the outer size of the door frame, the size deviation of the hole must be guaranteed to be less than 1.5mm / m, the door frame and the hull structure are both opened with V-shaped grooves, and the single-sided welding and double-sided forming welding method is adopted.

[0036] like Figure 2 As shown, the pilot door frame 1, the door panel 2, the upper guide rail 3, the lower guide rail 4 and the pulley frame 5 are composed. The door panel and the door frame need to be subjected to a watertight test. After the watertight test is completed, they are installed in sections as a pilot door as a whole with the hull.

[0037] In this embodiment, a hole is firstly opened on the hull section, as shown in FIG3 , the center point "O" of the pilot door is determined on the outer plate of the hull section, a horizontal line AB is drawn with the center point "O", and then a perpendicular line CD is drawn with the center point "O" as the intersection point, and with the AB and CD lines as references, parallel lines AB and CD are drawn respectively according to the size of the opening.

[0038] like Figure 4-5As shown, in this embodiment, the whole pilot door and door frame 1 are first fixed on a special installation base. The special installation base includes three supporting points. The lower ends of the three supporting points are welded on a steel structure base formed by splicing angle steels. A spiral support head with adjustable height is provided above the supporting points. By adjusting the spiral support head, the three supporting points are made to be on the same plane to control the accuracy of the overall installation of the pilot door. Then, positioning blocks 6 are installed under the door frame 1, with three positioning blocks 6 on each side. Lift the hull section where the pilot door is located, align the center of the opening with the center of the pilot door, slowly lower the hull section and place it on the positioning blocks 6, adjust the distance between the edge of the pilot door frame 1 and the edge of the opening of the hull section outer plate, and ensure that the gap is 5mm±1mm. When installing the positioning blocks 6, ensure that the upper surface is flat, so that the pilot door as a whole can be on the same horizontal plane as the outer plate of the hull.

[0039] In this embodiment, welding is carried out as follows Figure 5 The welding sequence shown is that the intermittent welding has no less than 16 sections around, the intermittent weld length is 50mm, and the intermittent welding adopts staggered cross welding. The welding sequence is: 101-102-103-104-105-106-107-108-109-110-111-112-113-114-115-116. After the intermittent welding is completed, the staggered cross welding method is also used for continuous welding until the pilot door and the hull outer plate are welded. The maximum welding length of continuous welding should be less than 300mm.

[0040] The present invention is a method for integrally installing a pilot door of a large container ship at the hull segmentation stage, and specifically comprises the following implementation steps:

[0041] S1. Determine the center point "O" of the opening on the outer plate of the hull segment, draw a horizontal line AB with the center point "O", and then draw a perpendicular line CD with the center point "O" as the intersection point;

[0042] S2. Based on the AB and CD lines, the opening lines are drawn based on the parallel lines of AB and CD according to the size of the opening, and the opening is then made. The unevenness of the surface around the opening of the hull segment outer plate is less than 1mm / m, and the diagonal deviation of the opening is less than 1.5mm / m;

[0043] S3. After the hull segment outer plate is opened, check the matching clearance between the door frame 1 and the hull segment outer plate opening, and the clearance on one side is 4mm-6mm;

[0044] S4. Fix the pilot door as a whole on a special mounting base, keep the four corners of the door frame 1 in a horizontal state, and install a positioning block 6 on each side of the door frame 1 to position the hull section where the pilot door is located.

[0045] S5, lifting the hull section where the pilot door is located, aligning the center of the opening on the outer plate of the hull section with the center of the pilot door, slowly lowering the hull section and placing it on the positioning block 6, adjusting the distance between the edge of the pilot door frame 1 and the edge of the opening on the outer plate of the hull section, so that the gap between the door frame 1 and the opening of the hull outer plate meets the requirements of step S3;

[0046] S6. Adjust the hull segment outer plate and the door frame 1 of the pilot door to be on the same horizontal plane, fix them by intermittent welding, and after the intermittent welding is completed, perform continuous welding to complete the welding of the pilot door and the hull outer plate.

[0047] The present invention discloses an overall installation method of a pilot door of a large container ship at a hull segmentation stage. Compared with a traditional method in which a pilot door frame is installed after the hull segments are closed, the method advances the installation process and completes the installation of the pilot door frame, door panels and accessories before the segments are closed. This not only reduces the workload of ship construction, but also can be assisted by a crane to avoid the pilot door being unable to be closed to a watertight state due to inconsistent deformation caused by the separate installation of the pilot door frame and the door panel, thereby affecting the safety of the ship's navigation. The overall installation of the pilot door frame, door panels and accessories can facilitate the early installation of the hydraulic system and the door closing device, thereby advancing the functional test, shortening the ship construction period and improving the safety of the installation process of the large equipment.

[0048] Although the above embodiments have been described in detail for the present invention, it should be understood by those skilled in the art that modifications or improvements may be made based on the contents disclosed in the present invention without departing from the spirit and scope of the present invention, and such modifications and improvements are within the spirit and scope of the present invention.

Claims

1. A method for integrally installing a pilot door of a large container ship at a hull segment stage, the pilot door being installed on a hull segment outer plate above the waterline of the large container ship, the pilot door structure comprising a door frame (1), a door panel (2), an upper guide rail (3), a lower guide rail (4), a pulley frame (5) and a hydraulic system, the door frame (1) of the pilot door being connected to a steel surrounding wall of the hull segment outer plate, the door panel (2) matching the door frame (1), an upper guide rail (3) being installed above the door frame (1), and a lower guide rail (4) being installed below the door frame (1), a pulley frame (5) being provided on the door panel (2), the door panel (2) being connected to the upper guide rail (3) and the lower guide rail (4) of the door frame (1) via the pulley frame (5), the hydraulic system being fixedly installed on the door panel (2), the pulley frame (5) cooperating with the upper guide rail (3) and the lower guide rail (4) to drive the door panel (2) to move to open and close the pilot door, characterized in that: The method comprises the following steps: S1. Determine the center point "O" of the opening on the outer plate of the hull segment, draw a horizontal line AB with the center point "O", and then draw a perpendicular line CD with the center point "O" as the intersection point; S2. Based on the AB and CD lines, the opening lines are drawn based on the parallel lines of AB and CD according to the size of the opening, and the opening is then made. The unevenness of the surface around the opening of the hull segment outer plate is less than 1mm / m, and the diagonal deviation of the opening is less than 1.5mm / m; S3. After the hole in the hull segment outer plate is opened, check the matching clearance between the door frame (1) and the hole in the hull segment outer plate. The clearance on one side is 4 mm to 6 mm. S4. Fix the pilot door as a whole on a special installation base, wherein the special installation base comprises three supporting points, the lower ends of the three supporting points are welded to a steel structure base formed by splicing angle steels, and spiral supporting heads with adjustable heights are arranged above the supporting points. By adjusting the spiral supporting heads, the three supporting points are arranged on the same plane to control the installation accuracy of the pilot door as a whole, the four corners of the door frame (1) are kept in a horizontal state, and a positioning block (6) is installed on each side of the door frame (1) to position the hull section where the pilot door is located; S5, lifting the hull section where the pilot door is located, aligning the center of the opening on the outer plate of the hull section with the center of the pilot door, slowly lowering the hull section and placing it on the positioning block (6), adjusting the distance between the edge of the pilot door frame (1) and the edge of the opening on the outer plate of the hull section, so that the gap between the opening of the door frame (1) and the outer plate of the hull section meets the requirements of step S3; S6. Adjust the hull section outer plate and the pilot door frame (1) to be on the same horizontal plane, fix them by intermittent welding, and after the intermittent welding is completed, perform continuous welding to complete the welding of the pilot door and the hull outer plate.

2. The method for integrally installing the pilot door of a large container ship at the hull segmentation stage according to claim 1 is characterized in that: In step S2, the size of the opening of the hull segment outer plate is 10 mm larger than the outer size of the door frame (1), and the size deviation of the opening of the hull segment outer plate is less than 1.5 mm / m.

3. The method for integrally installing the pilot door of a large container ship at the hull segmentation stage according to claim 1 is characterized in that: In step S4, the pilot door frame (1) and the door panel (2) need to be in a closed state before being installed as a whole.

4. The method for integrally installing the pilot door of a large container ship at the hull segmentation stage according to claim 1 is characterized in that In step S4, the pilot's door frame (1) and the door panel (2) are subjected to a watertightness test before overall installation.

5. The method for integrally installing a pilot door of a large container ship at the hull segmentation stage according to claim 1, characterized in that: In step S6, the intermittent welding has no less than 16 sections around it, the length of the intermittent weld is 50 mm, and the intermittent welding adopts the staggered cross welding method.

6. The method for integrally installing a pilot door of a large container ship at the hull segmentation stage according to claim 1, characterized in that: In step S6, the maximum welding length of the continuous welding is less than 300 mm, and the continuous welding adopts the staggered cross welding method.

7. The method for integrally installing a pilot door of a large container ship at the hull segmentation stage according to claim 1, characterized in that: The connection between the door frame (1) and the hull segment outer plate adopts a welding method of opening a V-shaped groove, single-sided welding and double-sided forming.

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