A method for onshore installation of ultra-large diameter GRP pipes

Abstract

The present invention relates to the field of pipeline construction technology, in particular to the onshore pulling and closing installation of super-large diameter GRP pipelines in seawater circulation systems, and specifically to a method for onshore installation of super-large diameter GRP pipelines. The specific steps of the pipeline pulling and closing of the method are as follows: the first step: making a clamp; the second step: installing the clamp, and installing the clamp on the ends of the installed pipeline and the adjacent ends of the pipeline to be installed respectively; the third step: installing the sleeve, synchronously operating multiple hand-operated hoists, and pulling the sleeve to the designed position; the fourth step: pipeline installation, by synchronously operating the hand-operated hoists, the end of the pipeline to be installed is inserted into the sleeve. If the installation accuracy of the pipeline to be installed does not meet the standard, the pipeline needs to be withdrawn; the fifth step: pipeline backfilling, placing the installed pipeline in an arc groove, and backfilling sand on both sides of the bottom of the pipe. Compared with the installation method of the traditional process, the present invention improves the installation efficiency and installation quality, improves the installation accuracy, has a simple structure, and greatly shortens the construction period.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline construction, in particular to the onshore pulling and closing installation of an ultra-large diameter GRP pipeline in a seawater circulation system, and specifically to an onshore installation method of an ultra-large diameter GRP pipeline. Background Art

[0002] Extra-large diameter GRP (glass reinforced plastic) pipes are usually used in seawater circulation systems. The current connection and installation methods of glass reinforced plastic pipes mainly include joint pasting, Haver joints and sleeve joints. Paste joints need to be pasted on site, and the construction conditions are harsh (to ensure that the pasting conditions are dry). The installation cost of Haver joints is high and it is not suitable for large-scale use. Sleeve joints have a wide range of applications and low costs. However, the traditional process for installing sleeve joint pipes is sling lifting, and then a single hand winch is hung on the sling on both sides of the pipe, and then the hand winch is used to pull and install. The installation process takes a long time to pull and close. Since the sling is a soft material and is not easy to control, the control effect of the pulling and closing accuracy is poor. Summary of the invention

[0003] In order to solve the problem that the traditional process for installing the above-mentioned sleeve joint pipeline is to use a sling to lift, and then hang a single hand winch on the sling on both sides of the pipeline respectively, and then use the hand winch to pull and install. This installation process takes a long time to pull and close. Since the sling is made of soft material and is not easy to control, the control effect of the pulling and closing accuracy is poor. The present invention provides a method for onshore installation of super-large diameter GRP pipelines, which improves the installation efficiency and installation quality.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a method for onshore installation of super-large diameter GRP pipes, and the specific installation steps are as follows:

[0005] Step 1: Make the clamps and process them according to the pipeline design drawings before construction;

[0006] Step 2: Install the clamps, and install the clamps on the ends of the installed pipe and the adjacent ends of the pipe to be installed, respectively, and multiple pull-in plates are evenly arranged on the outside of the clamps;

[0007] Step 3: Install the sleeve, hook the lever hoist on the closing plate of the installed pipe clamp; then hang the locking device on the sleeve, the installation position corresponds to the position of the lever hoist, and connect the closing plate and the locking device through the lever hoist; finally, synchronize the operation of multiple lever hoists to close the sleeve to the designed position of the installed pipe port;

[0008] Step 4: Pipeline installation. Install the lever hoist on the clamping plate of the installed pipe and the pipe to be installed to ensure that the axis and height of the installed pipe and the pipe to be installed are consistent. By synchronously operating multiple lever hoists, the end of the pipe to be installed is inserted into the sleeve. During the installation process, the advancement speed and distance of the monitored pipe are kept consistent. If the installation accuracy of the pipe to be installed does not meet the standard, the pipe needs to be withdrawn.

[0009] Step 5: Pipeline backfilling: Place the installed pipe in the excavated arc groove, check the pipe top elevation, and after it reaches the allowable error, backfill sand on both sides of the pipe bottom to avoid displacement of the installed pipe during subsequent pipe docking.

[0010] Furthermore, in the fourth step, when the pipeline needs to be withdrawn: a steel bottom support is placed at the sleeve of the pipe mouth of the pipeline to be withdrawn, multiple jacks are placed between the closing plate of the clamp on the pipeline to be withdrawn and the steel bottom support, and multiple square timbers are placed between the sleeve and the clamp at the upper end of the installed pipeline to prevent the sleeve from shifting during the withdrawal process, and multiple jacks are operated synchronously to push the pipeline to be withdrawn out of the sleeve.

[0011] Furthermore, the steel bottom support is a hollow triangular structure, including a rectangular frame, on which two relative frames a triangular support frame is fixedly provided, and on the remaining two relative frames of the rectangular frame a support plate is fixedly provided, and the support plate is fixedly connected to the triangular support frame at the same time.

[0012] Furthermore, in the second step, the clamp is composed of 4 pieces, and bolt holes are respectively provided at both ends of the clamp, and the clamps are fixedly connected by bolts. When the clamp is installed, three of the 4 clamps are connected by bolts to form a 3 / 4 arc, which is then put on the pipe end, and then the fourth clamp is inserted through the pipe end and connected to the original 3 / 4 arc. Finally, the clamp is fixed at a distance of 70-90 cm from the pipe end by bolts.

[0013] Furthermore, in the second step, a rubber gasket is fixedly provided on the inner side of the clamp, and a connecting hole cooperating with a lever hoist is provided on the pulling plate.

[0014] The technical effects and advantages of the present invention are as follows: the present invention provides a method for onshore installation of an ultra-large diameter GRP pipe. Compared with the installation method of the traditional process, a plurality of hand winches are firstly used in cooperation with the clamp, and the hand winches are synchronously operated to install the sleeve at the port of the installed pipe, and then a plurality of hand winches are used in cooperation with the clamp, and the hand winches are synchronously operated to install the pipe to be installed and the sleeve. The synchronous operation of the plurality of hand winches improves the installation efficiency and the installation quality, improves the installation accuracy, has a simple structure, and greatly shortens the construction period. At the same time, the clamp device can be used for pipe withdrawal operation, and has a wide range of applications. A rubber gasket is fixedly provided on the inner side of the clamp to ensure the close fit between the pipe and the clamp structure, and increase the friction between the clamp and the pipe. A connecting hole cooperating with the hand winch is provided on the pulling plate, which supports the hand winch. At the same time, when the pipe is withdrawn, the pulling plate serves as the force support point of the jack to withdraw the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the pipeline pulling and closing structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the hoop structure of the present invention;

[0017] Figure 3 It is a front view of the clamp of the present invention;

[0018] Figure 4 It is a top view of the clamp of the present invention;

[0019] Figure 5 It is a schematic diagram of the structure of the pull-and-close plate on the clamp of the present invention;

[0020] Figure 6 It is a schematic diagram of the pipeline withdrawal structure of the present invention;

[0021] Figure 7 It is a schematic diagram of the structure of the steel bottom support of the present invention;

[0022] Among them: 1-pipeline to be installed, 2-installed pipe, 3-sleeve, 4-hoop, 5-lever hoist, 6-closing plate, 7-bolt hole, 8-rubber gasket, 9-connecting hole, 10-jack, 11-steel base support, 12-square wood, 13-rectangular frame, 14-triangular support frame, 15-support plate, 16-pipeline to be withdrawn. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0024] Example:

[0025] like Figure 1-7 As shown in the figure, a method for installing an ultra-large diameter GRP pipe on land is shown in the figure. The specific installation steps are as follows:

[0026] Step 1: Make the clamp. Before construction, process the clamp 4 according to the pipeline design drawing;

[0027] Step 2: Install the clamp 4, respectively install the clamp 4 on the ends of the installed pipe 2 and the adjacent ends of the pipe to be installed 1, the outer side of the clamp 4 is evenly provided with four pull-in plates 6, the inner side of the clamp 4 is fixed with a rubber gasket 8, and the pull-in plate 6 is provided with a connection hole 9 that cooperates with the lever hoist 5;

[0028] The clamp 4 is composed of 4 pieces, and bolt holes 7 are respectively provided at both ends of the clamp 4. The clamps 4 are fixedly connected by bolts. When the clamp 4 is installed, three of the 4 clamps are connected by bolts to form a 3 / 4 arc, which is then mounted on the pipe end. Then, the fourth clamp is inserted through the pipe end and connected to the original 3 / 4 arc. Finally, the clamp is fixed by bolts at a distance of 80 cm from the pipe end.

[0029] Step 3: Install the sleeve, wrap the sleeve 3 around the sleeve 3 with a sealing tape or a 3t lifting tape for one week and fix it. First, fix the sleeve with the lifting tape; then evenly apply lubricant at 200mm on the outer wall of the pipe end of the installed pipe 2, and evenly apply lubricant on the rubber ring in the sleeve 3; then connect the lifting tape wrapped around the outer ring of the sleeve 3 with the crane chain using a 5t clamp to ensure that the rubber ring does not fall off, and then hang the four lever hoists 5 on the pulling plate 6 of the clamp 4 on the installed pipe 2; then hang the locking device on the sleeve 3, the installation position corresponds to the position of the lever hoist 5 one by one, and connect the pulling plate 6 and the locking device through the lever hoist 5; finally, synchronously operate the four lever hoists 5 to pull the sleeve 3 to the port design position of the installed pipe 2. At this time, the clamp 4 is retained on the pipe, which is convenient for subsequent pipe pulling and installation;

[0030] Step 4: Pipeline installation. Before installing the pipeline, use an air compressor to clean the sleeve 3 on the installed pipeline 2 and the pipeline joints of the pipeline to be installed 1 to ensure that there are no debris; lift and unload the pipeline to the docking area. When the distance between the pipe heads of the installed pipeline 2 and the pipeline to be installed 1 is about 10 cm, the pipeline slowly falls. When it is about 2-5 cm from the ground, the crane stops dropping the hook, and the installed pipeline 2 and the pipeline to be installed 1 are stabilized to prevent collision during the lifting process, and keep the pipeline off the ground;

[0031] Lubricant is evenly applied to the outside of the joint of the pipe to be installed 1 and the inside of the sleeve 3 of the installed pipe 2, and then four lever hoists 5 are evenly and correspondingly installed on the pull-in plates 6 of the clamps 4 on the installed pipe 2 and the pipe to be installed 1;

[0032] Adjust the height of the installed pipe 2 and the pipe to be installed 1 by pulling the hand chain hoist to align the two pipe ports;

[0033] Use a jack to fine-tune the position of the pipeline. For the upper and lower positions of the pipeline, place a steel plate directly under the pipeline. For the left and right positions, dig a pit at a 45-degree angle below for support to ensure that the axis and height of the installed pipeline 2 and the pipeline 1 to be installed are consistent.

[0034] The crane lifts the pipeline 1 to 2 cm off the ground. The non-pull-closed end of the pipeline 1 to be installed is corrected by a BobCat excavator. After the pipeline 1 to be installed is stable, the four operators synchronously operate the lever hoist 5. An observer in the pipe detects the distance between the installation ports of the installed pipeline 2 and the pipeline 1 to be installed in real time, and directs the four operators to monitor the advancement speed and distance of the pipeline to be consistent until the end of the pipeline 1 to be installed is inserted into the sleeve 3. If the installation accuracy of the pipeline 1 to be installed does not meet the standard, the pipeline needs to be withdrawn.

[0035] The pipeline withdrawal process is as follows: the arrangement of the slings and sling positions and the installation position of the clamp are consistent with those during the pulling and closing installation; a steel bottom support 11 is placed at the sleeve 3 at the pipe mouth of the pipeline 16 to be withdrawn; four jacks 10 are placed between the pulling plate 6 of the clamp 4 on the pipeline 16 to be withdrawn and the steel bottom support 11; a plurality of square timbers 12 are placed between the sleeve 3 and the clamp 4 at the upper end of the installed pipeline 2 to prevent the sleeve 3 from shifting during the withdrawal process; the four jacks 10 are operated synchronously to push the pipeline 16 to be withdrawn out of the sleeve 3.

[0036] The steel bottom support 11 is a hollow triangular structure, including a rectangular frame 13 , on which two opposite frames a triangular support frame 14 is fixedly provided, and on the other two opposite frames of the rectangular frame 13 a support plate 15 is fixedly provided, and the support plate 15 is fixedly connected to the triangular support frame 14 at the same time.

[0037] Step 5: Backfill the pipe. Place the installed pipe steadily in the excavated arc groove and check the pipe top elevation. After reaching the allowable error within ±1cm, backfill sand on both sides of the pipe bottom to avoid displacement of the installed pipe during subsequent pipe docking.

[0038] Through the above steps, the pulling, closing and withdrawing of the pipeline can be completed. The present invention has a simple structure, concise installation steps and is convenient for practical operation and application.

[0039] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A method for installing an ultra-large diameter GRP pipe on land, characterized in that: The specific installation steps are as follows: Step 1: Make the clamps and process them according to the pipeline design drawings before construction; Step 2: Install the clamps, and install the clamps on the ends of the installed pipe and the adjacent ends of the pipe to be installed, respectively, and multiple pull-in plates are evenly arranged on the outside of the clamps; Step 3: Install the sleeve, hook the lever hoist on the closing plate of the installed pipe clamp; then hang the locking device on the sleeve, the installation position corresponds to the position of the lever hoist, and connect the closing plate and the locking device through the lever hoist; finally, synchronize the operation of multiple lever hoists to close the sleeve to the designed position of the installed pipe port; Step 4: Pipeline installation. Install the lever hoist on the clamping plate of the installed pipe and the pipe to be installed to ensure that the axis and height of the installed pipe and the pipe to be installed are consistent. By synchronously operating multiple lever hoists, the end of the pipe to be installed is inserted into the sleeve. During the installation process, the advancement speed and distance of the monitored pipe are kept consistent. If the installation accuracy of the pipe to be installed does not meet the standard, the pipe needs to be withdrawn. When withdrawing the pipe: put a steel bottom support at the sleeve of the pipe mouth of the pipe to be withdrawn, put multiple jacks between the clamping plate and the steel bottom support of the clamp on the pipe to be withdrawn, and put multiple square wood between the sleeve and the clamp at the upper end of the installed pipe to prevent the displacement of the sleeve during the withdrawal process. Operate multiple jacks synchronously to push the pipe to be withdrawn out of the sleeve; Step 5: Pipeline backfilling: Place the installed pipe in the excavated arc groove, check the pipe top elevation, and after it reaches the allowable error, backfill sand on both sides of the pipe bottom to avoid displacement of the installed pipe during subsequent pipe docking.

2. The method for installing an ultra-large diameter GRP pipe on land according to claim 1, characterized in that: The steel bottom support is a hollow triangular structure, including a rectangular frame, on which two opposite frames a triangular support frame is fixedly provided, and on the other two opposite frames of the rectangular frame a support plate is fixedly provided, and the support plate is fixedly connected to the triangular support frame at the same time.

3. The method for installing an ultra-large diameter GRP pipe on land according to claim 1, characterized in that: In the second step, the clamp is composed of 4 pieces, and bolt holes are respectively provided at both ends of the clamp. The clamps are fixedly connected by bolts. When the clamp is installed, three of the 4 clamps are connected by bolts to form a 3 / 4 arc, which is then put on the pipe end. Then, the fourth clamp is inserted through the pipe end and connected to the original 3 / 4 arc. Finally, the clamp is fixed at a distance of 70-90 cm from the pipe end by bolts.

4. The method for installing an ultra-large diameter GRP pipe on land according to claim 1, characterized in that: In the second step, a rubber gasket is fixedly provided on the inner side of the clamp, and a connecting hole cooperating with a lever hoist is provided on the pulling plate.

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