阅读说明：本技术 一种水下沉管结构及施工方法 (Underwater immersed tube structure and construction method ) 是由 刘克文 贾荣谷 丁海涛 王城 杨纬卿 高连通 陈波 杨青盼 陈茹梅 张颖 郭光八 于 2021-09-18 设计创作，主要内容包括：本发明公开了一种水下沉管结构及施工方法,本发明的水下沉管结构并按照本发明的施工方法进行水下沉管施工,管道镇墩和管道支撑结构可确保管道不会因为水底浮力或水流推力作用,发生移位；对于海底沉管,本发明结构除了设计管道镇墩和管道支撑结构之外,还在管道的两端连接管道伸缩器,可避免沉在水底的管道在水的推力冲击作用下,产生位移,长时间的冲击加位移可造成管道与阀门、接头的连接处脱出。(The invention discloses an underwater immersed tube structure and a construction method, the underwater immersed tube structure is used for underwater immersed tube construction according to the construction method, and a pipeline anchor block and a pipeline supporting structure can ensure that a pipeline cannot be displaced due to underwater buoyancy or water flow thrust; for the submarine immersed tube, the structure of the invention is provided with the pipeline anchor blocks and the pipeline supporting structure, and the pipeline expansion pieces are connected at the two ends of the pipeline, so that the pipeline immersed at the bottom can be prevented from generating displacement under the thrust impact action of water, and the joints of the pipeline, the valve and the joint can be separated due to long-time impact and displacement.)

1. An underwater immersed tube structure, comprising: the system comprises a seamless steel pipe, a pipeline anchor block, a pipeline supporting structure, C30 concrete, lake bottom soil backfilling, a pipeline expansion piece, a tail water lifting pool and a tail water utilization system;

the two seamless steel pipes are arranged in parallel in a pipe ditch dug at the bottom of a lake or river, a pipeline anchor block is arranged on each seamless steel pipe at a certain distance, and a pipeline supporting structure is arranged in the middle of each two pipeline anchor blocks; backfilling by using lake bottom soil after the arrangement of the lake bottom or river bottom pipelines is finished; according to the construction method of the submarine immersed tube, the seamless steel tube is immersed to a submarine layer, two ends of the seamless steel tube are butted with the tail water lifting pool and the tail water utilization system respectively after passing through a sidewalk and a circular sea, the positions of the two ends of the seamless steel tube entering the sea are respectively connected with a pipeline expansion piece, pipeline piers are arranged on the seamless steel tube at intervals, and a pipeline supporting structure is arranged in the middle of each two pipeline piers.

2. The underwater immersed tube structure of claim 1, wherein the pipeline piers are arranged at intervals of 12-15m, and after the steel caisson at the periphery of the pipeline piers is fixed on the seamless steel tube, C30 concrete is poured into the steel caisson.

3. An underwater sinking pipe structure of claim 1, wherein the pipeline supporting structure fixes the seamless steel pipes by channel steel, and angle steel is cross-connected between two seamless steel pipes.

4. An underwater immersed tube structure as claimed in claim 1, wherein the backfill depth of the lake bottom soil is greater than 0.7 m.

5. An underwater immersed tube structure as claimed in claim 1 wherein said trench is trapezoidal in cross-section.

6. The method for constructing an underwater immersed tube structure according to any one of claims 1 to 5, comprising the steps of:

s1: according to the design of the early scheme, measuring the position of the immersed tube and the tube ditch;

s2: intercepting the lake or the river according to the measured position, and excavating a pipe trench at the bottom of the lake or the river;

s3: flattening the undisturbed soil layer of the pipe trench, and paving a gravel layer of 150 mm; when the soil quality of an undisturbed soil layer of the foundation is poor, 300mm gravel layers are paved, or the gravel layers can be paved in two layers, wherein the lower layer is 150mm thick by using crushed stones with the particle size of 5-32mm, and the upper layer is 150mm thick by paving medium coarse sand;

s4: after the pipe ditch base is leveled and reinforced, two seamless steel pipes are arranged on the base in parallel;

s5: arranging a pipeline anchor pier at each 12-15m interval on the seamless steel pipe, and arranging a pipeline supporting structure in the middle of the two pipeline anchor piers;

s6: backfilling the pipe trench by using lake bottom soil or river bottom soil, and tamping;

s7: before sinking the pipe at the seabed, carrying out groove excavation at the position of the sinking pipe; when the pipe is sunk at the sea bottom, the existing peripheral drainage interface and elevation are rechecked before construction;

s8: cleaning and flattening the pre-laid position of the pipeline before the pipeline sinks;

s9: after welding seamless steel pipes on the water surface pontoon, arranging pipeline anchor blocks at intervals of 12-15m, and arranging a pipeline supporting structure in the middle of the two pipeline anchor blocks;

s10: the pipeline is sunk after water is injected into the pipeline, and C30 concrete is injected into a steel caisson of the pipeline anchor block after the pipeline is sunk in place;

s11: and after the pipeline is placed in place, backfilling the groove.

7. The construction method of the underwater immersed tube structure as claimed in claim 6, wherein the seamless steel tube in S4 is arranged and placed in a manner of welding every 12m by adopting a full penetration butt weld.

8. The method for constructing an underwater immersed tube structure according to claim 6, wherein the pipeline ballast pier in the step S5 is arranged in a manner that a steel caisson is fixed on two seamless steel tubes, and C30 concrete is poured into the steel caisson; the pipeline supporting structure adopts channel steel to fix two seamless steel pipes, and angle steel is fixed on the channel steel in a crossed mode between the two seamless steel pipes.

9. An underwater immersed tube structure according to any one of claims 1 to 5, which discloses application in the technical field of underwater immersed tube construction.

Technical Field

The invention belongs to the technical field of underwater immersed tube construction, and particularly relates to an underwater immersed tube structure and a construction method.

Background

At present, aiming at the problems of sewage treatment and tail water utilization in the lake center island, corresponding engineering measures are provided, the mode of 'treatment on the island and utilization outside the island' is adopted, the current situation of the water source sewage treatment equipment on the island is utilized, the sewage is discharged to a tail water lifting pool after the sewage treatment reaches the first-class A standard, and the tail water is conveyed to a tail water utilization system of a sewage treatment plant through a submarine pipeline in a power mode;

the underwater immersed tube construction has the following problems at present: 1) the pipeline is positioned under the water bottom, particularly on the sea bottom, and due to the buoyancy of water, if an effective fixed structure is not designed, the pipeline can float upwards; 2) the pipeline sinking at the bottom can generate displacement under the thrust impact action of water, and the long-time impact and displacement can cause the connection of the pipeline, the valve and the joint to be separated.

Disclosure of Invention

In order to solve the technical problems, the invention designs an underwater immersed tube structure and a construction method for the structure, and the underwater immersed tube structure is realized by the following technical scheme:

an underwater immersed tube structure, comprising: the system comprises a seamless steel pipe, a pipeline anchor block, a pipeline supporting structure, C30 concrete, lake bottom soil backfilling, a pipeline expansion piece, a tail water lifting pool and a tail water utilization system;

the two seamless steel pipes are arranged in parallel in a pipe ditch dug at the bottom of a lake or river, a pipeline anchor block is arranged on each seamless steel pipe at a certain distance, and a pipeline supporting structure is arranged in the middle of each two pipeline anchor blocks; backfilling by using lake bottom soil after the arrangement of the lake bottom or river bottom pipelines is finished; sinking a seamless steel pipe to a seabed layer according to the seabed sinking pipe construction method, wherein two ends of the seamless steel pipe are butted with a tail water lifting pool and a tail water utilization system respectively after passing through a sidewalk and a circular sea path, the sea-entering positions of the two ends of the seamless steel pipe are respectively connected with a pipeline expansion piece, pipeline piers are arranged on the seamless steel pipe at intervals, and a pipeline supporting structure is arranged in the middle of each two pipeline piers;

furthermore, one position is arranged at intervals of 12-15m on each pipeline anchor block, and C30 concrete is injected into a steel caisson after the steel caisson at the periphery of the pipeline anchor blocks is fixed on the seamless steel pipe;

furthermore, the pipeline supporting structure fixes the seamless steel pipes through channel steel, and angle steel is connected between the two seamless steel pipes in a cross mode;

further, the backfill depth of the lake bottom soil is more than 0.7 m;

furthermore, the cross section of the pipe channel is trapezoidal;

another object of the present invention is to provide a method for constructing an underwater immersed tube structure, comprising:

s1: according to the design of the early scheme, measuring the position of the immersed tube and the tube ditch;

s2: intercepting the lake or the river according to the measured position, and excavating a pipe trench at the bottom of the lake or the river;

s3: flattening the undisturbed soil layer of the pipe trench, and paving a gravel layer of 150 mm; when the soil quality of an undisturbed soil layer of the foundation is poor, 300mm gravel layers are paved, or the gravel layers can be paved in two layers, wherein the lower layer is 150mm thick by using crushed stones with the particle size of 5-32mm, and the upper layer is 150mm thick by paving medium coarse sand;

s4: after the pipe ditch base is leveled and reinforced, two seamless steel pipes are arranged on the base in parallel;

s5: arranging a pipeline anchor pier at each 12-15m interval on the seamless steel pipe, and arranging a pipeline supporting structure in the middle of the two pipeline anchor piers;

s6: backfilling the pipe trench by using lake bottom soil or river bottom soil, and tamping;

s7: before sinking the pipe at the seabed, carrying out groove excavation at the position of the sinking pipe; when the pipe is sunk at the sea bottom, the existing peripheral drainage interface and elevation are rechecked before construction;

s8: cleaning and flattening the pre-laid position of the pipeline before the pipeline sinks;

s9: after welding seamless steel pipes on the water surface pontoon, arranging pipeline anchor blocks at intervals of 12-15m, and arranging a pipeline supporting structure in the middle of the two pipeline anchor blocks;

s10: the pipeline is sunk after water is injected into the pipeline, and C30 concrete is injected into a steel caisson of the pipeline anchor block after the pipeline is sunk in place;

s11: after the pipeline is placed in place, backfilling the groove;

furthermore, the seamless steel pipes in the S4 are arranged and placed in a mode of welding every 12 meters, and full penetration butt welding seams are adopted;

furthermore, the pipeline ballast pier in the S5 is arranged in a mode that a steel caisson is fixed on the two seamless steel pipes, and C30 concrete is poured into the steel caisson; the pipeline supporting structure adopts channel steel to fix two seamless steel pipes, and angle steel is fixed on the channel steel in a crossed manner between the two seamless steel pipes;

the invention has the beneficial effects that:

by adopting the underwater immersed tube structure and the construction method of the invention to carry out underwater immersed tube construction, the pipeline anchor block and the pipeline supporting structure can ensure that the pipeline cannot be displaced due to underwater buoyancy or water flow thrust; for the submarine immersed tube, the structure of the invention is provided with the pipeline anchor blocks and the pipeline supporting structure, and the pipeline expansion pieces are connected at the two ends of the pipeline, so that the pipeline immersed at the bottom can be prevented from generating displacement under the thrust impact action of water, and the joints of the pipeline, the valve and the joint can be separated due to long-time impact and displacement.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic plan view of a pipeline ballast and pipeline support connection for an underwater immersed tube structure;

FIG. 2 is a cross-sectional view of a trench excavation backfill for an underwater pipeline of an underwater immersed tube structure;

FIG. 3 is a schematic cross-sectional view of a pipeline through the sea floor in an underwater immersed tube structure;

FIG. 4 is a schematic view of a pipeline crossing seabed plan structure of an underwater immersed tube structure;

FIG. 5 is a plan view of a pipeline ballast of an underwater immersed tube structure;

FIG. 6 is a plan view of a pipeline attachment for an underwater immersed tube structure;

in the drawings, the components represented by the respective reference numerals are listed below:

the method comprises the following steps of 1-seamless steel pipes, 2-pipeline piers, 201-steel caissons, 3-pipeline supporting structures, 301-channel steel, 302-angle steel, 4-C30 concrete, 5-lake bottom soil backfilling, 6-pipeline expansion pieces, 7-tail water lifting ponds and 8-tail water utilization systems.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1 to 6, an underwater sinking pipe structure includes: the system comprises a seamless steel pipe 1, a pipeline anchor block 2, a pipeline supporting structure 3, C30 concrete 4, lake bottom soil backfill 5, a pipeline expansion piece 6, a tail water lifting pool 7 and a tail water utilization system 8;

the two seamless steel pipes 1 are arranged in parallel in a pipe trench dug at the lake bottom or the river bottom, a pipeline anchor block 2 is arranged on each seamless steel pipe 1 at a certain distance, and a pipeline supporting structure 3 is arranged in the middle of each two pipeline anchor blocks 2; backfilling by using lake bottom soil after the arrangement of the lake bottom or river bottom pipelines is finished; sinking a seamless steel pipe 1 to a seabed layer according to the seabed sinking pipe construction method of the invention, wherein two ends of the seamless steel pipe 1 are respectively butted with a tail water lifting pool 7 and a tail water utilization system 8 after passing through a sidewalk and a circular sea, the two ends of the seamless steel pipe 1 are respectively connected with a pipeline expansion piece 6 at the sea-entering surface, a pipeline anchor block 2 is arranged on the seamless steel pipe 1 at intervals, and a pipeline supporting structure 3 is arranged at the middle position of every two pipeline anchor blocks 2;

the pipeline piers 2 are arranged at one position at intervals of 12-15m, and C30 concrete 4 is injected into the steel caisson 201 after the steel caisson 201 at the periphery of the pipeline piers 2 is fixed on the seamless steel pipe 1;

the pipeline supporting structure 3 fixes the seamless steel pipes 1 through channel steel 301, and angle steel 302 is connected between the two seamless steel pipes 1 in a cross mode;

the depth of the lake bottom soil backfilling 5 is more than 0.7 m;

the cross section of the pipe channel is trapezoidal.

Example 2

The construction in example 1 was carried out by the following underwater sinking method:

s1: according to the design of the early scheme, measuring the position of the immersed tube and the tube ditch;

s2: intercepting the lake or the river according to the measured position, and excavating a pipe trench at the bottom of the lake or the river;

s3: flattening the undisturbed soil layer of the pipe trench, and paving a gravel layer of 150 mm; when the soil quality of an undisturbed soil layer of the foundation is poor, 300mm gravel layers are paved, or the gravel layers can be paved in two layers, wherein the lower layer is 150mm thick by using crushed stones with the particle size of 5-32mm, and the upper layer is 150mm thick by paving medium coarse sand;

s4: after the pipe ditch base is leveled and reinforced, two seamless steel pipes are arranged on the base in parallel;

s5: arranging a pipeline anchor pier at each 12m interval on the seamless steel pipe, and arranging a pipeline supporting structure in the middle of the two pipeline anchor piers; the pipeline anchor blocks are arranged in a way that steel caissons are fixed on two seamless steel pipes, and C30 concrete is injected into the steel caissons; the pipeline supporting structure adopts channel steel to fix two seamless steel pipes, and angle steel is fixed on the channel steel in a crossed manner between the two seamless steel pipes;

s6: backfilling the pipe trench by using lake bottom soil or river bottom soil, and tamping;

s7: before sinking the pipe at the seabed, carrying out groove excavation at the position of the sinking pipe; when the pipe is sunk at the sea bottom, the existing peripheral drainage interface and elevation are rechecked before construction;

s8: cleaning and flattening the pre-laid position of the pipeline before the pipeline sinks;

s9: after welding seamless steel pipes on the water surface pontoon, arranging pipeline anchor blocks at intervals of 12-15m, and arranging a pipeline supporting structure in the middle of the two pipeline anchor blocks; the seamless steel pipe of the submarine immersed tube is a reinforced 3PE anti-corrosion seamless steel pipe with the wall thickness of 12 mm; the arrangement and placement mode of the seamless steel pipes is welding every 12 meters, and full penetration butt welding seams are adopted;

s10: the pipeline is sunk after water is injected into the pipeline, and C30 concrete is injected into a steel caisson of the pipeline anchor block after the pipeline is sunk in place;

s11: and after the pipeline is placed in place, backfilling the groove.

In conclusion, by the underwater immersed tube structure and the construction method for underwater immersed tube construction, the pipeline anchor blocks and the pipeline supporting structure can ensure that the pipeline cannot be displaced due to underwater buoyancy or water flow thrust; for the submarine immersed tube, the structure of the invention is provided with the pipeline anchor blocks and the pipeline supporting structure, and the pipeline expansion pieces are connected at the two ends of the pipeline, so that the pipeline immersed at the bottom can be prevented from generating displacement under the thrust impact action of water, and the joints of the pipeline, the valve and the joint can be separated due to long-time impact and displacement.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.