阅读说明：本技术 一种超大直径grp管道首段管节水下稳定固定的方法 (Method for stably fixing first-section pipe joint of super-large-diameter GRP pipeline underwater ) 是由 马伯飞 陈强 洪凌云 吴楠 孙鸿昊 王长洪 王向宇 张永进 李松涛 于 2020-12-21 设计创作，主要内容包括：本发明涉及一种施工工艺,具体涉及一种超大直径GRP管道首段管节水下稳定固定的方法。包括以下步骤：S1：下放首段首节管道；S2：下放沙箱并固定管道；S3：下放相邻首段次节管道；S4：重复步骤S2；S5：安装剪刀撑；S6：重复步骤S1～S5；S7：回填碎石；S8：拆除沙箱及剪刀撑。本发明采用沙箱与丝杠相互配合的方式限制管道的横向位移,同时使用剪刀撑限制管道滚动位移,最后回填碎石使管道整体稳定固定,能够使首段管道在水下保持稳定,保证首段管道安装精度,并且能够满足后续管道的安装要求,施工质量得到保证且大大提高,工艺直接有效,沙箱及剪刀撑等固定构件可循环使用,极大的降低了施工成本,缩短施工周期。(The invention relates to a construction process, in particular to a method for stably fixing a first section pipe joint of an ultra-large-diameter GRP pipeline underwater. The method comprises the following steps: s1: lowering the first section of the pipeline; s2: lowering a sandbox and fixing a pipeline; s3: lowering the adjacent first section of the secondary pipeline; s4: repeating step S2; s5: installing a cross brace; s6: repeating the steps S1-S5; s7: backfilling broken stones; s8: and (5) dismantling the sandbox and the cross brace. According to the invention, the transverse displacement of the pipeline is limited by adopting a mode of mutually matching the sandbox and the lead screw, meanwhile, the cross brace is used for limiting the rolling displacement of the pipeline, finally, broken stones are backfilled to ensure that the whole pipeline is stably fixed, the first-section pipeline can be kept stable underwater, the installation precision of the first-section pipeline is ensured, the installation requirement of the subsequent pipeline can be met, the construction quality is ensured and greatly improved, the process is direct and effective, the sandbox, the cross brace and other fixing components can be recycled, the construction cost is greatly reduced, and the construction period is shortened.)

1. A method for stably fixing a first section pipe joint of an ultra-large diameter GRP pipeline underwater is characterized by comprising the following steps: the method comprises the following steps:

s1: lowering a first section of pipeline, lowering the first section of pipeline according to a measurement and control system on the pipeline hoisting tool, and adjusting the position of the pipeline to enable the error between the actual coordinate of the pipeline and the designed coordinate of the pipeline to be within an allowable range;

s2: lowering the sandbox and fixing the pipeline, lifting the sandbox and lowering the sandbox to the outer side positions of two ends of the pipeline, and adjusting a jacking piece arranged on the sandbox to jack the outer wall of the pipeline tightly;

s3: placing adjacent first-section secondary pipelines, placing the adjacent first-section secondary pipelines according to a measurement and control system on a pipeline hoisting tool, and adjusting the positions of the pipelines to enable the error between the actual coordinates of the pipelines and the designed coordinates of the pipelines to be within an allowable range;

s4: lowering the sandbox and fixing the pipeline, and repeating the step S2;

s5: installing a cross brace, and after the installation of the adjacent pipelines is finished, installing the cross brace between the two adjacent pipelines to limit the rolling displacement of the pipelines;

s6: repeating the steps S1-S5 until the installation of the first section of pipe joint group is completed;

s7: backfilling broken stones, namely backfilling the broken stones at the middle position of the pipeline to ensure the stability of the pipeline;

s8: and (4) removing the sandbox and the cross braces to enable the sandbox jacking pieces to be separated from the outer wall of the pipeline, removing the cross braces and hanging the sandbox and the cross braces away from the pipeline.

2. The method for underwater stable fixation of the first section pipe joint of the GRP pipeline with the ultra-large diameter according to claim 1, wherein the method comprises the following steps: in step S1, the position of the pipeline is adjusted so that the error between the actual coordinates of the pipeline and the design coordinates of the pipeline is not greater than 2 cm.

3. The method for underwater stable fixation of the first section pipe joint of the GRP pipeline with the ultra-large diameter according to claim 1, wherein the method comprises the following steps: in step S2, the sandbox is lifted and lowered to the position 10cm outside the two ends of the pipeline, and then the position of the pipeline is adjusted so that the error between the actual position and the designed position of the pipeline is not greater than 1 cm.

4. The method for underwater stable fixation of the first section pipe joint of the GRP pipeline with the ultra-large diameter according to claim 1, wherein the method comprises the following steps: in the step S2, the fastening member mounted on the sandbox is a sandbox screw, and the sandbox screw is adjusted to fasten the sandbox screw to the outer wall of the pipeline.

5. The method for underwater stable fixation of the first section pipe joint of the GRP pipeline with the ultra-large diameter according to claim 4, wherein the method comprises the following steps: the sandbox lead screw end portion is provided with an arc-shaped plate adaptive to the radian of the pipeline, and a rubber sheet is lined inside the arc-shaped plate and used for protecting the pipeline.

6. The method for underwater stable fixation of the first section pipe joint of the GRP pipeline with the ultra-large diameter according to claim 1, wherein the method comprises the following steps: in the step S2, a gravel ton bag is arranged in the sandbox, the bottom of the sandbox is of an openable structure, and a control device for controlling the bottom of the sandbox to open and close is arranged at the lower part of the sandbox.

7. The method for underwater stable fixation of the first section pipe joint of the GRP pipeline with the ultra-large diameter according to claim 1, wherein the method comprises the following steps: in step S3, the position of the pipeline is adjusted so that the error between the actual coordinates of the pipeline and the design coordinates of the pipeline is not greater than 1 cm.

8. The method for underwater stable fixation of the first section pipe joint of the GRP pipeline with the ultra-large diameter according to claim 1, wherein the method comprises the following steps: in the step S5, the scissor supports are screw structures, the length of the scissor supports can be freely adjusted, the scissor supports are connected with the pipeline installation hoop, two scissor supports are respectively arranged at the upper end and the lower end of each two adjacent pipelines, and the two scissor supports are arranged in an X shape.

9. The method for underwater stable fixation of the first section pipe joint of the GRP pipeline with the ultra-large diameter according to claim 8, wherein the method comprises the following steps: the mounting manner of the scissor brace in the step S5 is as follows: the method comprises the steps of conveying the scissor supports to a position to be installed, adjusting the length of the scissor supports according to the actual position of a pipeline and the position of a mounting hoop preformed hole, and finally connecting the scissor supports and the mounting hoop preformed hole through bolts.

10. The method for underwater stable fixation of the first section pipe joint of the GRP pipeline with the ultra-large diameter according to claim 6, wherein the method comprises the following steps: in step S7, after the pipeline is stabilized, the bottom of the sandbox is controlled to be opened.

Technical Field

The invention relates to a construction process, in particular to a method for stably fixing a first section pipe joint of an ultra-large-diameter GRP pipeline underwater.

Background

The GRP pipeline is a novel material, is widely applied to municipal pipe networks, power plant circulating water pipelines and the like in the global range at present, and has the advantages of corrosion resistance, light weight, high strength, good designability and low cost of raw materials. However, again, this material has a density of only 2.22kg/m³The pipeline installation and construction method has the advantages that the pipeline installation and construction method is easy to move under the action of water flow and wind waves in water, a plurality of operation surfaces are required to be simultaneously increased on one pipeline installation path due to the requirement of construction progress in the underwater pipeline installation and construction operation, so that a reliable guarantee measure is required, the first section of pipeline is ensured not to move in the water, and the precision can meet the requirement of follow-up pipeline installation.

The applicant proposes in patent application CN201810964033.6 a method for underwater installation of large-diameter GRP pipelines, which comprises locking and backfilling the pipelines, locking and backfilling the installed pipelines, ballasting the pipelines by using pier bags to prevent the pipelines from floating and rotating, and then ballast by throwing stones until the pipelines are stabilized. However, the fixing mode is only suitable for the installation and fixation of the mutual connection between the pipelines with one free end and one fixed end; when first section pipeline installation alone, and both ends are the free movement end, the fixed band only retrains the pipeline from the pipeline top, but the pipeline itself is the cylinder to because the influence of rivers and stormy waves, displacement or rotatory roll phenomenon appear in the pipeline that can lead to the completion of having installed, thereby influence the installation of pipeline installation precision and follow-up pipeline.

Disclosure of Invention

The invention aims to solve the technical problems that a plurality of working faces are required to be additionally arranged simultaneously for mounting an underwater pipeline, the head-end pipeline is ensured not to be displaced in water, and the precision is required to meet the mounting requirement of a subsequent pipeline, and provides a method for stably fixing a head-section pipeline joint of a GRP pipeline under water.

The technical scheme adopted by the invention for realizing the purpose is as follows: a method for stably fixing a first section pipe joint of an ultra-large diameter GRP pipeline underwater comprises the following steps: s1: lowering a first section of pipeline, lowering the first section of pipeline according to a measurement and control system on the pipeline hoisting tool, and adjusting the position of the pipeline to enable the error between the actual coordinate of the pipeline and the designed coordinate of the pipeline to be within an allowable range;

s2: lowering the sandbox and fixing the pipeline, lifting the sandbox and lowering the sandbox to the outer side positions of two ends of the pipeline, and adjusting a jacking piece arranged on the sandbox to jack the outer wall of the pipeline tightly;

s3: placing adjacent first-section secondary pipelines, placing the adjacent first-section secondary pipelines according to a measurement and control system on a pipeline hoisting tool, and adjusting the positions of the pipelines to enable the error between the actual coordinates of the pipelines and the designed coordinates of the pipelines to be within an allowable range;

s4: lowering the sandbox and fixing the pipeline, and repeating the step S2;

s5: installing a cross brace, and after the installation of the adjacent pipelines is finished, installing the cross brace between the two adjacent pipelines to limit the rolling displacement of the pipelines;

s6: repeating the steps S1-S5 until the installation of the first section of pipe joint group is completed;

s7: backfilling broken stones, namely backfilling the broken stones at the middle position of the pipeline to ensure the stability of the pipeline;

s8: and (4) removing the sandbox and the cross braces to enable the sandbox jacking pieces to be separated from the outer wall of the pipeline, removing the cross braces and hanging the sandbox and the cross braces away from the pipeline.

Further, in step S1, the position of the pipeline is adjusted so that the error between the actual coordinates of the pipeline and the design coordinates of the pipeline is not greater than 2 cm.

Further, in step S2, the sandbox is lifted and lowered to the position 10cm outside the two ends of the pipeline, and then the position of the pipeline is adjusted so that the error between the actual position and the designed position of the pipeline is not greater than 1 cm.

Further, in step S2, the fastening member mounted on the sandbox is a sandbox screw, and the sandbox screw is adjusted to fasten the sandbox screw to the outer wall of the pipeline.

Furthermore, sandbox lead screw tip has the arc of adaptation pipeline radian, and the inside rubber lining of arc is used for protecting the pipeline.

Further, in step S2, a gravel ton bag is installed inside the sandbox, the bottom of the sandbox is an openable structure, and a control device for controlling the opening and closing of the bottom of the sandbox is installed at the lower part of the sandbox.

Further, in step S3, the position of the pipeline is adjusted so that the error between the actual coordinates of the pipeline and the design coordinates of the pipeline is not greater than 1 cm.

Further, in the step S5, the scissor supports are screw structures, the length of each scissor support can be freely adjusted, the scissor supports are connected with the pipeline installation hoops, two scissor supports are respectively arranged at the upper ends and the lower ends of every two adjacent pipelines, and the two scissor supports are arranged in an X shape.

Further, the mounting manner of the scissors brace in step S5 is: the method comprises the steps of conveying the scissor supports to a position to be installed, adjusting the length of the scissor supports according to the actual position of a pipeline and the position of a mounting hoop preformed hole, and finally connecting the scissor supports and the mounting hoop preformed hole through bolts.

Further, in step S7, after the pipeline is stabilized, the bottom of the sandbox is controlled to be opened.

The invention has the following beneficial effects:

(1) according to the invention, the transverse displacement of the pipeline is limited by adopting a mode of mutually matching the sandbox and the lead screw, meanwhile, the cross brace is used for limiting the rolling displacement of the pipeline, and finally, broken stones are backfilled to stably fix the whole pipeline, so that the first-section pipeline can be kept stable underwater, the installation precision of the first-section pipeline is ensured, the installation requirements of subsequent pipelines can be met, the construction quality is ensured and greatly improved, and the process is direct and effective.

(2) The end part of the screw rod of the sandbox is provided with an arc-shaped plate adaptive to the radian of the pipeline, the rubber is lined inside the arc-shaped plate to protect the pipeline, and the pipeline is fastened by adjusting the screw rod outside the sandbox, so that the arc-shaped plate is firmly close to the outer wall of the pipeline.

(3) According to the invention, the gravel ton bag is arranged in the sand box, the bottom of the sand box is of an openable structure, the control device for controlling the bottom of the sand box to open and close is arranged at the lower part of the sand box, after gravel backfilling is finished at the middle position of the pipeline and the pipeline is ensured to be stable, the bottom of the sand box can be controlled to open, and after the sand box is lifted away from the pipeline, the gravel ton bag in the sand box is backfilled to the middle position of the pipeline, so that the stability of the pipeline can be further increased, and the sand box is.

(4) The two cross braces are arranged in an X shape, so that the rolling displacement of the pipelines can be better limited, and the structure is more stable and firm.

(5) The sand box and the cross braces can be recycled, so that the construction cost is greatly reduced, and the construction period is shortened.

Drawings

FIG. 1 is a schematic plan view of the present invention.

Fig. 2 is a schematic end view 1 (without cross-braces and mounting hoops) of the present invention.

Fig. 3 is a schematic end view of the present invention, fig. 2 (without sandbox).

Fig. 4 is a schematic view of the sandbox of the present invention.

In the figure: 1. the sand box comprises a sand box body 2, a sand box screw rod 3, an installation hoop 4, a pipeline 5 and a shear brace.

Detailed Description

The present invention will be described in detail below with reference to the drawings and examples, but the present invention is not limited to the specific examples.

As shown in fig. 1-4, a method for underwater stable fixation of a first section pipe joint of an ultra-large diameter GRP pipeline comprises the following steps:

s1: lowering a first section of pipeline, lowering the first section of pipeline according to a measurement and control system on the pipeline hoisting tool, and adjusting the position of the pipeline 4 to ensure that the error between the actual coordinate of the pipeline and the designed coordinate of the pipeline is not more than 2 cm;

s2: a sand box is placed and a pipeline is fixed, after a first section of pipe joint is installed, the sand box 1 is lifted and placed to the position 10cm outside the two ends of the pipeline 4, the sand box 1 is of a frame structure with the length of 2m, the width of 1.5m and the height of 2.5m, crushed stone ton bags are arranged in the sand box 1, 1.5t of crushed stones can be contained in each crushed stone ton bag, 3 crushed stone ton bags can be contained in one sand box 1, the bottom of the sand box 1 is of an openable structure, a control device for controlling the bottom of the sand box 1 to open and close is arranged at the lower part of the sand box 1, a sand box lead screw 2 is arranged on the sand box 1, the sand box lead screw 2 is positioned at the position 2m of the height of the sand box 1 and just can tightly push the outermost side of the outer wall of the circular pipeline 4, an arc-shaped plate adaptive to the radian of the pipeline is arranged at the end part of the sand box lead screw 2, rubber is lined in the arc-shaped plate to protect the pipeline 4, then adjusting an outer screw rod on the sandbox 1 to enable the arc-shaped plate to be firmly close to the outer wall of the pipeline 4 and tightly push the pipeline 4;

s3: placing adjacent first-section secondary pipelines, placing the adjacent first-section secondary pipelines according to a measurement and control system on a pipeline hoisting tool, and adjusting the position of the pipeline 4 to ensure that the error between the actual coordinates of the pipeline and the design coordinates of the pipeline is not more than 1 cm;

s4: lowering the sandbox and fixing the pipeline, and repeating the step S2;

s5: install the bridging, after the installation of adjacent pipeline 4 is accomplished, install 5 restriction pipeline roll displacements of bridging between two adjacent pipelines 4, the mounting means of bridging 5 is: the method comprises the following steps that a diver firstly conveys the cross braces 5 to a position to be installed, then the length of each cross brace 5 is adjusted according to the actual position of a pipeline 4 and the position of a reserved hole of an installation hoop 3, each cross brace 5 is of a screw rod structure, the length can be freely adjusted, finally the cross braces 5 are connected with the reserved hole of the installation hoop 3 through bolts, the cross braces are connected through the bolts, disassembly is convenient, two cross braces 5 are respectively arranged at the upper end and the lower end of each two adjacent pipelines 4, the two cross braces 5 are arranged in an X shape, the rolling displacement of the pipelines can be better limited, and the structure is more stable and firm;

s6: repeating the steps S1-S5 until the installation of the first section of pipe joint group is completed;

s7: backfilling broken stones, namely backfilling the broken stones at the middle position of the pipeline 4 to ensure the stability of the pipeline, and controlling the bottom of the sand box 1 to be opened after the pipeline 4 is kept stable;

s8: demolish sandbox and bridging, the diver breaks away from 4 outer walls of pipeline with 1 outside lead screw of sandbox, demolish 5 bolts of bridging, use the crane to hang sandbox 1 and bridging 5 from pipeline 4, but fixed component such as sandbox 1 and bridging 5 recycles, very big reduction construction cost, shortened construction cycle, the rubble ton bag of sandbox 1 inside is backfilled to 4 intermediate positions of pipeline, can further increase pipeline stability, help lifting by crane the sandbox simultaneously.

The construction quality requirement of the first section pipeline installation designed in the embodiment is adopted: the error between the position of the first section of pipe joint and the designed position cannot be larger than 1.5cm, the range of a pipe seam for subsequent pipeline installation is 1 cm-3 cm, and the axis deviation cannot be larger than 3.75 cm.

The first section pipeline installation condition that designs in the adoption this embodiment does: the length of each pipeline 4 is 18m, the inner wall of each pipeline is 4m, the outer wall of each pipeline is 4.18m, the materials are GRP materials, the lower cushion layer is a two-piece stone +2 mm-4 mm broken stone cushion layer, the depth of water in the first section is 7m, the pipelines 4 are installed by using a 150t crane ship, the crane ship firstly places the first section of the first pipeline at a set position according to the coordinates fed back by the existing measurement and control system on a crane device, the position deviation is not more than 2cm, the crane ship places sand boxes 1 at the positions 10cm on two sides of the installed first section of the first pipeline, after accurately adjusting the position of the first section of the first pipeline again, a diver tightens the sand box lead screw 2 to enable the sand box lead screw to be tightly attached to the outer wall of the pipelines 4, the crane ship downwards installs the adjacent first section of the second section of the first pipeline, installs the sand boxes 1, after the sand box lead screw 2 is tightened, the diver installs the scissor supports 5 to the anchor, use bolted connection between 5 and the installation staple bolt 3 of bridging, repeat above-mentioned step in proper order until 6 whole installations of first section 6 pipelines 4 accomplish, 4 six one rows of pipelines of every group, interval 2m between the pipeline 4, use 5000t side barge to load 2000m year rubble to carry out the ballast backfill to pipeline 4 middle part after 4 installations of pipeline are accomplished, backfill the completion back, the diver demolishs sandbox 1 and bridging 5, accomplishes the installation work of first section tube coupling.

According to the invention, the transverse displacement of the pipeline is limited by adopting a mode of mutually matching the sandbox and the lead screw, meanwhile, the cross brace is used for limiting the rolling displacement of the pipeline, finally, broken stones are backfilled to ensure that the whole pipeline is stably fixed, the first-section pipeline can be kept stable underwater, the installation precision of the first-section pipeline is ensured, the installation requirement of the subsequent pipeline can be met, the construction quality is ensured and greatly improved, the process is direct and effective, the sandbox, the cross brace and other fixing components can be recycled, the construction cost is greatly reduced, and the construction period is shortened.

The above description is further detailed in connection with the preferred embodiments of the present invention, and it is not intended to limit the practice of the invention to these descriptions. It will be apparent to those skilled in the art that various modifications, additions, substitutions, and the like can be made without departing from the spirit of the invention.