Offshore drainage immersed tube joint water stop structure and construction method

Abstract

The invention provides an offshore drainage immersed tube joint water stop structure and a construction method, and belongs to the field of water conservancy projects. The structure comprises an immersed tube (1), a joint protection mechanism and an immersed tube protection mechanism, the joint protection mechanism comprises a sealing mechanism (2), an upper protection mechanism (3) and a lower protection mechanism (4); the sealing mechanism (2) is positioned on a joint of the immersed tube (1); the upper protection mechanism (3) is positioned above a joint of the immersed tube (1); the lower protection mechanism (4) is positioned below a joint of the immersed tube (1); the immersed tube protection mechanism is used for protecting joints of the immersed tubes (1) and the overall structure. The method comprises the steps that a foundation trench is excavated, and a foundation bed is laid; prefabricating an immersed tube and ancillary facilities; transporting and installing the immersed tube; and laying a protection mechanism. The structure can adapt to large water pressure of the seabed and differential settlement of the structure, and the problems of water leakage and sand leakage of a drainage immersed tube project are prevented to the maximum extent.

Description

Technical Field

[0001] The invention belongs to the field of electric power and chemical engineering, and in particular relates to a water-stopping structure of an offshore drainage immersed pipe joint and a construction method. Background Art

[0002] With the popularization of green environmental protection concepts, deep-sea concealed drainage has gradually replaced the early nearshore open drainage and has been widely used in drainage projects. Deep-sea concealed drainage mostly uses the immersed tube method, which has obvious advantages in terms of flexible structural section types and scales. However, water and sand leakage problems often occur in drainage immersed tube projects, which have a certain impact on the marine environment.

[0003] For example, Chinese patent CN115929990A (publication date: April 7, 2023) discloses a method for installing deep-sea submarine pipelines, which can connect pipelines into segments of more than 500 meters, use air bags and water injection to sink pipelines multiple times, avoid the problem of pipeline breakage caused by large single sinking volume, and first fill the cushion layer after the foundation trench is formed, then sink the pipeline, and then backfill the sand, gravel layer and block stone layer in turn. However, this method still lacks the connection method between pipelines, and is not suitable for situations where the structure section type and scale of the immersed tube method are flexible.

[0004] Chinese patent CN113863378A (publication date: December 31, 2021) provides an undersea tunnel construction method and a tunnel immersed tube connection structure, which connects two adjacent tunnel immersed tubes through a sealing ring. While ensuring the sealing, the position of the two adjacent tunnel immersed tubes can be adjusted to reduce the construction difficulty. The method of connecting the immersed tubes with the sealing ring needs to be further optimized.

[0005] Therefore, in order to address the difficulties in stable connection and sealing of immersed tube joints in complex deep-sea environments, it is necessary to develop a flat-jointed and covered immersed tube joint water-stopping structure that can adapt to high water pressure and joint deformation. Summary of the invention

[0006] In order to adapt to the complex environment of the seabed and enhance the sealing performance, on the one hand, the present invention provides a water-stopping structure for an offshore drainage immersed pipe joint, including an immersed pipe, a joint protection mechanism, and an immersed pipe protection mechanism;

[0007] The joint protection mechanism includes a sealing mechanism, an upper protection mechanism and a lower protection mechanism; the sealing mechanism is located at the joint of the immersed tube; the upper protection mechanism is located above the joint of the immersed tube, and is used to disperse the force of uneven settlement of the seabed on the immersed tube joint; the lower protection mechanism is located below the joint of the immersed tube, and is used to provide support and disperse the force when the immersed tube joint is displaced; the immersed tube protection mechanism covers the immersed tube and the joint protection mechanism, and is used to protect the overall structure.

[0008] Furthermore, the upper protection mechanism is a mold bag concrete, and the mold bag concrete is laid on the upper, left and right sides of the immersed tube joint and arranged in a trapezoidal shape along the outer side of the immersed tube.

[0009] Furthermore, the lower protection mechanism is a steel pad, the size of which is larger than the size of the joint below the immersed tube, and is used to support the joint of the entire immersed tube.

[0010] Furthermore, the sealing mechanism is a rubber waterstop, which is buried in the joint of the immersed tube.

[0011] Furthermore, the immersed tube protection mechanism includes a riprap base bed, sand, non-woven geotextile, cushion stone blocks, and covering stone blocks; the cushion stone blocks are arranged under the immersed tube; the sand is laid on both ends of the immersed tube; the non-woven geotextile, cushion stone blocks, and covering stone blocks are sequentially covered on top of the sand.

[0012] Furthermore, the sand, cushion stone and covering stone have descending slopes at both ends.

[0013] Furthermore, the cushion stone blocks and the covering stone blocks are laid with uniform thickness.

[0014] On the other hand, the present invention provides a construction method for a water-stop structure of an offshore drainage immersed pipe joint, characterized in that it comprises the following steps:

[0015] S1. Dig a foundation trench on the seabed mud surface and lay a riprap foundation bed at the bottom;

[0016] S2. Prefabricate the immersed tube in the factory, bury the water stop at the interface of the immersed tube, and paste the steel pad;

[0017] S3. Float the submerged tubes to the site, install them in place, and connect the submerged tubes flushly;

[0018] S4. Lay bag concrete at the joints of each immersed tube;

[0019] S5. Backfill the excavated foundation trench with sand and soil, lay non-woven geotextile, and cover with cushion stones and covering stones.

[0020] Compared with the prior art, the advantages and effects of this application are as follows:

[0021] 1. The present invention provides a water-stopping structure for an offshore drainage immersed pipe joint, which protects the joints and the entire structure. Additional facilities such as mold bag concrete and steel pads are arranged on the basis of the rubber waterstop, which can adapt to the high water pressure on the seabed and uneven structural settlement, and prevent water leakage and sand leakage in the drainage immersed pipe project to the greatest extent.

[0022] 2. The present invention provides a construction method for a water-stopping structure of an offshore drainage immersed pipe joint, in which the immersed pipe and the joint protection mechanism are prefabricated in the factory in advance. In addition, the sand and soil of the excavated foundation pit are used for backfilling, thereby reducing the amount of work and improving the economic benefits.

[0023] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application so that it can be implemented in accordance with the contents of the specification, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings as follows.

[0024] Based on the detailed description of the specific embodiments of the present application in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0026] in:

[0027] Figure 1 It is a schematic diagram of a front cross-sectional view of a water-stop structure of an offshore drainage immersed pipe joint according to an embodiment of the present invention;

[0028] Figure 2 It is a schematic side cross-sectional view of a water-stop structure of an offshore drainage immersed pipe joint according to an embodiment of the present invention;

[0029] Figure 3 A flow chart of a construction method of a water-stop structure for an offshore drainage immersed pipe joint according to an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of an immersed tube of a marine drainage immersed tube joint water-stopping structure according to an embodiment of the present invention;

[0031] Figure numerals: 1. immersed tube; 2. sealing mechanism; 3. upper protection mechanism; 4. lower protection mechanism; 5. riprap base bed; 6. sand; 7. non-woven geotextile; 8. cushion stone; 9. covering stone. Specific embodiments

[0032] To make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all of the embodiments. In the following description, specific details such as specific configuration and components are provided only to help fully understand the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, for clarity and brevity, the description of known functions and structures is omitted in the embodiment.

[0033] It should be understood that the references to "one embodiment" or "this embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "one embodiment" or "this embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0034] In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0035] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association object relationship, indicating that there can be two relationships. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0036] The term "at least one" in this article is merely a description of the association relationship of associated objects, indicating that there may be three relationships. For example, at least one of A and B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0037] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusions.

[0038] Example 1

[0039] like Figure 1 The embodiment shown relates to a water-stopping structure for an offshore drainage immersed tube joint, comprising an immersed tube 1, a joint protection mechanism, and an immersed tube protection mechanism;

[0040] The joint protection mechanism includes a sealing mechanism 2, an upper protection mechanism 3 and a lower protection mechanism 4; the sealing mechanism 2 is located at the joint of the immersed tube 1; the upper protection mechanism 3 is located above the joint of the immersed tube 1; the lower protection mechanism 4 is located below the joint of the immersed tube 1; the immersed tube protection mechanism is used to protect the joint of the immersed tube 1 and the overall structure.

[0041] Furthermore, the sealing mechanism 2 is a rubber water stop, which is buried at the joint of the immersed tube 1. The rubber water stop utilizes the high elasticity and compression deformation of rubber to produce elastic deformation under various loads, thereby playing a role in tightening and sealing, effectively preventing water leakage and seepage in the building structure, and playing a role in shock absorption and buffering.

[0042] Furthermore, the upper protection mechanism 3 is a mold bag concrete, which is laid on the upper, left and right sides of the joint of the immersed tube 1 and arranged in a trapezoidal shape along the outer side of the immersed tube 1. The mold bag concrete is an additional measure that can shield and protect the joints and water stop strips, and can adapt to the water stop effect under uneven settlement.

[0043] Furthermore, the lower protection mechanism 4 is a steel plate, which is pasted under the joint of the immersed tube 1. The steel plate is located between the lower part of the immersed tube joint and the lower structural foundation to protect the lower joint and water stop.

[0044] Furthermore, the immersed tube protection mechanism includes a riprap bed 5, sand 6, non-woven geotextile 7, cushion stone 8, and covering stone 9; the cushion stone 8 is arranged below the immersed tube to form a structural foundation; the sand 6 is laid on both ends of the immersed tube; the non-woven geotextile 7, cushion stone 8, and covering stone 9 are sequentially covered on top of the sand 6. Sand is backfilled on both sides of the immersed tube, and the top surface is covered with non-woven geotextile to prevent the backfill from being lost, and the top surface and both sides are covered with stone to prevent water erosion and protect the immersed tube.

[0045] Furthermore, the sand 6, the cushion stone 8 and the covering stone 9 have descending slopes at both ends.

[0046] like Figure 2 As shown, the rubber water stop strip of the sealing mechanism 2 is embedded in the pipe wall at the joint of the immersed pipe 1 by bolts;

[0047] Furthermore, the cushion stone 8 and the covering stone 9 cover the sand 6, and the thickness of the cushion stone 8 and the covering stone 9 is uniform; the thickness of the riprap base bed 5 located below the immersed tube is uniform; the mold bag concrete is only laid around the joints of the immersed tube; the cushion stone 8 and the covering stone 9 cover the mold bag concrete and the height increases accordingly.

[0048] Technical effect of this embodiment: The water-stopping structure of an offshore drainage immersed tube joint provided by this embodiment can enable a deep-sea drainage immersed tube joint to adapt to high water pressure and joint deformation.

[0049] Example 2

[0050] like Figure 3 As shown, this embodiment provides a construction method of a water-stop structure for an offshore drainage immersed pipe joint based on Embodiment 1, comprising the following steps:

[0051] S1, excavating an inverted trapezoidal foundation trench on the seabed mud surface, retaining the sand and soil 6 of the excavated foundation trench, and laying a riprap foundation bed 5 at the bottom;

[0052] S2. Prefabricate the immersed tube 1 in the factory, bury the water stop belt at the interface of the immersed tube, and paste the steel pad;

[0053] S3, float the immersed tube 1 to the site, install it in place after launching it into the water, place it in the center of the foundation trench, and connect each immersed tube 1 flushly;

[0054] S4, laying mold bag concrete at the joints of each immersed tube 1, wherein the mold bag concrete is trapezoidal in shape, and the bottom edge covers the riprap base bed 5;

[0055] S5, backfill the excavated foundation trench with sand 6 on both sides of the mold bag concrete along the foundation pit slope, lay non-woven geotextile 7, and cover with cushion stone 8 and cover stone 9 of uniform thickness.

[0056] Technical effect of this embodiment: The construction method of a water-stop structure for an offshore drainage submerged pipe joint provided by this embodiment can effectively prevent water leakage and seepage in building structures and save working procedures and reduce costs.

[0057] Example 3

[0058] This embodiment is based on Embodiments 1 and 2, and takes two sections of 30m long and 9.8m wide immersed pipe splicing joints as an example to introduce a water-stopping structure of an offshore drainage immersed pipe joint and its construction method. Figure 4 As shown, the immersed tube 1 is a double-hole common wall section, each hole has a water-passing section size of 4.2m×4.2m, a wall thickness of 0.5m, and a riprap base bed 5 is provided at the bottom. The joint structure is composed of a rubber water stop, a mold bag concrete, a steel pad, backfill sand 6, a non-woven geotextile 7, a cushion block stone 8, and a covering block stone 9.

[0059] The construction method includes the following steps:

[0060] 1. Excavate the foundation trench and lay the gravel base bed;

[0061] 2. Prefabricate the immersed tube, bury the water stop, and paste the steel pad;

[0062] 3. The first section of the submerged tube is floated to the site and installed in place;

[0063] 4. The second section of the immersed tube is floated and installed, and connected with the first section of the immersed tube;

[0064] 5. Backfill behind the immersed tube, lay geotextile, and cover with cushion stones and boulders.

[0065] Technical effect of this embodiment: The water-stop structure of an offshore drainage immersed tube joint and its construction method provided by this embodiment can be used to solve the problems of water leakage and sand leakage in projects with flexible structural section types and scales of the immersed tube method, thereby improving the connection stability of the immersed tube joint.

[0066] The above description is only the preferred embodiment of the present invention, which does not limit the protection scope of the present invention. For those skilled in the art, the present invention can be modified and varied in various ways. Within the spirit and principle of the present invention, any change, modification, replacement, integration and parameter change of these embodiments by conventional substitution or capable of achieving the same function without departing from the principle and spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A water-stopping structure for an offshore drainage immersed pipe joint, characterized in that: It comprises a immersed tube (1), a joint protection mechanism, and an immersed tube protection mechanism; The joint protection mechanism comprises a sealing mechanism (2), an upper protection mechanism (3) and a lower protection mechanism (4); the sealing mechanism (2) is located at the joint of the immersed tube (1); the upper protection mechanism (3) is located above the joint of the immersed tube (1) and is used to disperse the force exerted on the joint of the immersed tube (1) by uneven settlement of the seabed; the lower protection mechanism (4) is located below the joint of the immersed tube (1) and is used to provide support force and disperse the force when the joint of the immersed tube (1) is displaced; the immersed tube protection mechanism covers the immersed tube (1) and the joint protection mechanism and is used to protect the overall structure.

2. According to claim 1, a water-stopping structure for an offshore drainage immersed pipe joint, characterized in that: The upper protection mechanism (3) is a mold bag concrete, which is laid on the upper, left and right sides of the joint of the immersed tube (1) and arranged in a trapezoidal shape along the outer side of the immersed tube (1).

3. According to claim 2, a water-stopping structure for an offshore drainage immersed pipe joint, characterized in that: The lower protection mechanism (4) is a steel pad, the size of which is larger than the size of the joint below the immersed tube (1), and is used to support the joint of the entire immersed tube (1).

4. The offshore drainage immersed pipe joint water-stopping structure according to claim 4, characterized in that: The sealing mechanism (2) is a rubber water stop strip, which is buried in the joint of the immersed tube (1).

5. The offshore drainage immersed pipe joint water-stopping structure according to claim 1 or 4, characterized in that: The immersed tube protection mechanism comprises a riprap base bed (5), sand (6), a non-woven geotextile (7), cushion stone blocks (8), and covering stone blocks (9); the cushion stone blocks (8) are arranged below the immersed tube; the sand (6) is laid on both ends of the immersed tube; the non-woven geotextile (7), cushion stone blocks (8), and covering stone blocks (9) are sequentially covered on top of the sand (6).

6. The offshore drainage immersed pipe joint water-stopping structure according to claim 5, characterized in that: The sand (6), the cushion stone (8) and the covering stone (9) have descending slopes at both ends.

7. The offshore drainage immersed pipe joint water-stopping structure according to claim 5, characterized in that: The cushion stone blocks (8) and the covering stone blocks (9) are laid with uniform thickness.

8. A construction method for a water-stop structure for an offshore drainage immersed pipe joint as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1, digging a foundation trench on the seabed mud surface and laying a riprap foundation bed (5) at the bottom; S2, prefabricate the immersed tube (1) in the factory, bury the water stop strip at the interface of the immersed tube, and stick the steel pad; S3, floating the immersed tubes (1) to the site, launching them into the water and installing them in place, and connecting the immersed tubes (1) with each other by flat joints; S4, laying bagged concrete at the joints of each immersed tube (1); S5, backfilling the excavated foundation trench with sand (6), laying a non-woven geotextile (7), and covering with cushion stones (8) and covering stones (9).

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