A pipeline welding construction method in a narrow space

Abstract

The present application provides a kind of pipeline welding construction method in narrow space, can solve the technical problems of poor welding quality and slow construction in traditional welding pipeline mode, comprising jacking device, the lifting end of the jacking device is fixed with support table, the support table is rotatably connected with support tray;The lower end of the welded pipeline is reserved with the space of the support tray of jacking device enough to put into pipeline section, the lower end of pipeline section is placed on the support tray, the upper end of pipeline section is connected with the lower end of welded pipeline;Rotate pipeline section, the operator rotates the girth weld formed by the butt joint of welded pipeline and pipeline section;After girth weld is welded, jacking device lifts the welded pipeline as a whole, temporarily fixes the welded pipe section, and jacking device retracts to initial state.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building houses, in particular to the pipe welding technology in building houses, and specifically to a pipe welding construction method in a narrow space. BACKGROUND

[0002] With the rapid development of social economy and construction industry, more and more multi-storey buildings are rising in cities. The pipe well space in multi-storey buildings is narrow, the pipes are relatively dense, the operable space is limited, the pipes are close to the wall, and the pipe sections need to be welded together to be used normally. At present, the fixed pipe "skylight" welding method is adopted.

[0003] However, the above welding method has the defects that the side of the pipe close to the skylight is easy to weld and can ensure the welding quality, but the operator needs to constantly adjust the body position to weld the side close to the wall, which not only increases the welding time and leads to slow construction process, but also cannot guarantee the welding quality, easily misses the dead angle of welding, and leads to subsequent rework. The weld formed by this welding method is discontinuous and has poor appearance. SUMMARY

[0004] The present application provides a pipe welding construction method in a narrow space, which can solve the technical problems of poor welding quality and slow construction in the traditional pipe welding method.

[0005] The present application is realized by the following technical solutions:

[0006] A pipe welding construction method in a narrow space, comprising a jacking device, the lifting end of the jacking device is fixed with a supporting table, and the supporting table is rotatably connected with a supporting disc;

[0007] It comprises the following steps:

[0008] S01, preparing a plurality of pipe sections, and fixing and installing the jacking device at the construction position;

[0009] S02, reserving enough space for the pipe section to be placed on the supporting disc at the lower end of the welded pipe and the supporting disc of the jacking device, placing the lower end of the pipe section on the supporting disc, and butting the upper end of the pipe section with the lower end of the welded pipe;

[0010] S03, rotating the pipe section, and the operator rotates the girth weld formed by the butt joint of the welded pipe and the pipe section;

[0011] S04, after the girth weld is completed, the jacking device lifts the welded pipe as a whole, temporarily fixes the welded pipe section, and retracts the jacking device to the initial state;

[0012] S05, repeating steps S02-S04 to weld all pipe sections to form an integral pipe.

[0013] Further, in the docking process, the gap between the upper end of the pipe section and the girth weld of the welded pipe is adjusted by the jacking device in step S02, and the girth weld gap is controlled to be 1-3mm, and the operator first fixes the girth weld by spot welding.

[0014] Further, a plurality of temporary fixing assemblies are installed on the building wall closest to the welded pipe, the temporary fixing assembly comprises a temporary support and a U-shaped connecting piece, a positioning vertical plate is connected to the temporary support, and the two ends of the U-shaped connecting piece are provided with external threads and are fixed on the positioning vertical plate through nuts.

[0015] In step S04, the welded pipe is fixed on the positioning vertical plate through the U-shaped connecting piece.

[0016] Further, an extension plate is fixed to the rear side of the positioning vertical plate, a plurality of long holes are arranged on the extension plate, and the extension plate is connected to the temporary support through the long holes by bolts.

[0017] Further, in step S04, a positioning sleeve is pre-buried on each floor slab, the axis of the positioning sleeve needs to be on the same straight line, and when the upper end of the welded pipe passes through the floor slab, it needs to pass through the positioning sleeve.

[0018] Further, the jacking device is a jack.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] 1. The supporting plate of the jacking device supports the pipe section, which can make the pipe section rotate and weld in a 360° space without dead angle, ensure the welding quality, and have good welding appearance.

[0021] The present application reduces the welding time of each weld in a narrow space, reduces the physical consumption of labor, reduces the construction difficulty, and improves the enthusiasm of workers, improves the construction efficiency, and speeds up the construction progress.

[0022] 2. The welding construction is carried out by the pipe welding construction method in a narrow space, which reduces the rework rate of pipe welding, reduces the consumption of materials, optimizes the construction scheme, greatly reduces the investment of labor and materials, has significant economic benefits, and minimizes the cost.

[0023] 3. High quality and reliability The pipe welding construction method can make the pipe welds rotate in all directions without dead angle, is flexible and light in construction, better guarantees the construction quality, improves the welding quality and appearance, and realizes one-time optimization.

[0024] 4、The construction method of the present application has few procedures, can be reused, has good turnover, and meets the green construction concept;

[0025] 5、The welded pipeline can be temporarily fixed on the nearby wall through the plurality of temporary fixing assemblies, the problem of being unable to be temporarily fixed with the increase of the welding length is avoided, and the operation is simple and convenient;

[0026] 6、The construction method of the present application has simple process, does not need the special body position welding construction of the operating personnel, has safety, and the pipeline welding auxiliary tool is relatively light in weight, convenient to operate, and does not need to use large machines. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a pipeline welding construction state diagram in a narrow space according to the present application;

[0028] Figure 2 is a jacking device schematic diagram according to the present application;

[0029] Figure 3 is a temporary fixing assembly schematic diagram according to the present application;

[0030] In the figure: 1, jack, 2, supporting table, 3, supporting tray, 4, temporary fixing assembly, 41, temporary support, 42, extension plate, 43, positioning vertical plate, 44, U-shaped connecting piece, 5, pipeline section, 6, welded pipeline. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] In the description of the application, it should be understood that the terms "front", "back", "up", "down", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application. The present application will be further described below in combination with the drawings and embodiments.

[0033] In the process of building large shopping malls or stations and other public place buildings, pipes need to be installed in pipe wells, such pipes often have only 20-30cm space to the building wall, and it is very inconvenient to use conventional pipe welding method, therefore, the embodiment discloses a pipe welding construction method in narrow space, before construction, a jacking device and a plurality of temporary fixing assemblies 4 need to be prepared.

[0034] As shown in Figure 2 , the jacking device selects a jack 1, a square supporting table 2 is welded at the lifting end of the jack 1, a tapered roller bearing is installed on the supporting table 2, the outer ring of the tapered roller bearing is fixedly connected with the supporting table 2, and the inner ring is fixed with a supporting tray 3 through a connecting shaft, so that the supporting tray 3 can rotate relative to the supporting table 2.

[0035] As shown in Figure 3 , the temporary fixing assembly 4 is used for temporarily fixing the welded pipe, and mainly includes a temporary support 41, an extension plate 42, a positioning vertical plate 43 and a U-shaped connecting piece 44, the temporary support 41 is temporarily fixed on the wall body through a bolt assembly, the extension plate 42 is welded at the rear side of the positioning vertical plate 43 in a transverse distribution, the positioning vertical plate 43 is provided with a mounting hole in advance, two long holes are processed on the extension plate 42, and the extension plate 42 is connected and matched on the temporary support 41 through bolts penetrating through the long holes. The U-shaped connecting piece 44 is bent from a reinforcing bar, outer threads are processed at two ends of the U-shaped connecting piece 44, and the two ends of the U-shaped connecting piece 44 are fixed on the positioning vertical plate 43 through nuts and mounting holes.

[0036] As shown in Figure 1 , the pipe welding construction method in narrow space includes the following steps:

[0037] S01, a plurality of pipe sections 5 are prepared, and a jacking device is fixedly installed at a ground construction position of the bottom layer of the building;

[0038] S02, the lower end of the welded pipe 6 is placed on the supporting tray 3 of the jacking device, and the lower end of the pipe section is placed on the supporting tray 3, and the upper end of the pipe section is connected with the lower end of the welded pipe.

[0039] During the connecting process, the gap between the upper end of the pipe section and the lower end of the welded pipe is adjusted by adjusting the jacking device, the pipe section is connected and matched, two persons are needed to cooperate with each other on the construction site, a level is used to inspect the verticality of the pipe, the pipe section cannot be welded seamlessly, and a certain gap needs to be reserved. For pipes with a diameter less than 50mm, the reserved gap should be between 1-2mm; for pipes with a diameter greater than 50mm, the reserved gap should be between 2-3mm, and the pipe section can be fixed by spot welding after inspection.

[0040] S03, rotating the pipe section, the operator rotates the circumferential weld formed by the butt joint of the welded pipe and the pipe section;

[0041] In this step, the circumferential weld facing the direction of the professional welder is welded first, and then the pipe section is rotated by 180° with the help of pipe tongs and other tools to weld the circumferential weld on the original wall side. This is repeated twice to weld the circumferential weld,

[0042] S04, after the circumferential weld is completed, the jacking device lifts the welded pipe as a whole, and the lifting distance is sufficient to place the next pipe section. The welded pipe section is temporarily fixed by the temporary fixing assembly 4, and the jacking device is retracted to the initial state;

[0043] In this step, as the welded pipe grows, it will inevitably pass through the upper floor slab. In order to ensure the verticality of the installed pipeline, positioning sleeves are pre-buried on each floor slab. The axis of the positioning sleeves needs to be on the same straight line. When the upper end of the welded pipe passes through the floor slab, it needs to pass through the positioning sleeve;

[0044] During the temporary fixing of the welded pipe, the temporary support 41 is temporarily fixed to the closest wall surface through the bolt assembly. After the U-shaped connecting piece 44 is sleeved on the welded pipe, the two ends of the U-shaped connecting piece 44 are fixed to the positioning vertical plate 43 through the nut fitting installation hole. By adjusting the relative distance of the extension plate 42, the distance of the U-shaped connecting piece 44 can be adjusted to meet the requirements of fixing the welded pipe. When the welded pipe needs to be rotated or jacked up, the bolts of the U-shaped connecting piece 44 are loosened to realize the movement of the welded pipe.

[0045] S05, repeat steps S02-S04 to weld all pipe sections from bottom to top layer by layer to form an integral pipe. After the entire vertical pipe is welded, remove the pipe welding and rotating tool and connect the horizontal main pipe at the bottom layer.

[0046] The pipe welding construction method in a narrow space described in this embodiment promotes the improvement and innovation of the pipe welding construction technology in a narrow space, optimizes the construction scheme, and through the pipe rotating technology in a narrow space, the welding time of each pipe weld is controlled within 10 minutes in a narrow space, improving the pipe welding efficiency and construction quality. The implementation of this method solves the drawbacks of traditional construction methods, improves the technical level of the construction industry, and has good technical benefits.

Claims

1. A method for pipe welding construction in a confined space, characterized in that, The device includes a lifting device, the lifting end of which is fixed with a support platform, and a support tray is rotatably connected to the support platform; multiple temporary fixing components are installed on the building wall closest to the welded pipe, each temporary fixing component including a temporary bracket and a U-shaped connector, the temporary bracket being connected to a positioning vertical plate, and the two ends of the U-shaped connector being provided with external threads and fixed to the positioning vertical plate by nuts; It includes the following steps: S01. Prepare multiple pipe sections and fix the lifting device at the construction location; S02. The lower end of the welded pipe and the support tray of the lifting device should be reserved with enough space to place the pipe section. Place the lower end of the pipe section on the support tray and connect the upper end of the pipe section with the lower end of the welded pipe. S03. Rotate the pipe section. The operator performs rotary welding on the circumferential seam formed by the connection between the welded pipe and the pipe section. S04. After the circumferential weld is completed, the lifting device will lift the welded pipe section as a whole and temporarily fix it. The lifting device will then retract to its initial state. In this step, the welded pipe is fixed to the positioning vertical plate using a U-shaped connector; S05. Repeat steps S02-S04 to weld all pipe sections to form a complete pipe system.

2. The pipe welding construction method in a confined space according to claim 1, characterized in that, In step S02, during the docking process, the circumferential gap between the upper end of the pipe section and the lower end of the welded pipe is controlled by adjusting the lifting device. The circumferential gap is controlled to be 1-3mm. The operator first performs spot welding to fix the circumferential gap.

3. The pipe welding construction method in a confined space according to claim 2, characterized in that, An extension plate is fixed to the rear side of the positioning vertical plate. The extension plate has multiple elongated holes, and the extension plate is connected to the temporary support by bolts passing through the elongated holes.

4. The pipe welding construction method in a confined space according to claim 1, characterized in that, In step S04, positioning sleeves are pre-embedded in each floor slab. The center lines of the positioning sleeves must be on the same straight line. When the upper end of the welded pipe passes through the floor slab, it needs to pass through the positioning sleeve.

5. The method for pipe welding in a confined space according to any one of claims 1-4, characterized in that, The lifting device is a jack.

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