CN117846016A - Large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method - Google Patents
Large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method Download PDFInfo
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- CN117846016A CN117846016A CN202311872629.0A CN202311872629A CN117846016A CN 117846016 A CN117846016 A CN 117846016A CN 202311872629 A CN202311872629 A CN 202311872629A CN 117846016 A CN117846016 A CN 117846016A
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- Prior art keywords
- construction
- foundation trench
- crossing
- immersed tube
- pipe
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- 238000010276 construction Methods 0.000 title claims abstract description 66
- 238000009412 basement excavation Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000013461 design Methods 0.000 claims abstract description 5
- 239000010802 sludge Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 6
- 238000010408 sweeping Methods 0.000 claims description 6
- 238000013102 re-test Methods 0.000 claims description 5
- 230000032258 transport Effects 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009933 burial Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/52—Submerged foundations, i.e. submerged in open water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/06—Constructions, or methods of constructing, in water
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Underground Or Underwater Handling Of Building Materials (AREA)
Abstract
The invention discloses a large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method, and belongs to the technical field of construction engineering. The foundation trench excavation construction method comprises the following steps: firstly, measuring and paying off, establishing a coordinate control network, determining the axis of a pipeline strictly according to a construction drawing, and then paying off the excavation lines of the pile sites and the foundation grooves of the jet grouting piles, wherein the precision meets the design requirement; then keeping the navigation of at least one side of the water channel smooth; after the dredger is towed to a construction site by the working boat, the dredger distributes anchors according to the built coordinate control network according to the ship position displayed by the shipborne GPS positioning system; the dredger adopts a sectional, layered and strip-dividing construction mode to excavate a foundation trench, a foundation trench slope adopts a step-type excavation construction mode, and the dredger transports sludge generated by excavating the foundation trench along a channel; and finally, foundation trench construction detection and repair are carried out. The invention can be constructed in an offshore complex geographic environment, and the construction quality is ensured through strict construction detection and repair.
Description
Technical Field
The invention relates to the technical field of construction engineering, in particular to a large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method.
Background
In the construction process of the water delivery immersed tube, the construction of the foundation trench is a key technology, and the quality of the foundation trench directly influences the construction cost and the stability.
At present, the river-crossing water delivery immersed tube built in China is mainly used for a single inland river, and the river basin is simple and stable. But the rainfall in the inland river area of the offshore is rich, the line is close to the sea outlet and the reservoir, the groundwater level is basically flush with the horizontal plane, the burial depth is shallow, water can possibly be generated after the foundation pit is excavated, the covering layer is mainly composed of a sand layer and a sand gravel layer, is loose, is very easy to generate side slope collapse, and needs to be improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method which can realize river-crossing construction in an offshore complex geographic environment.
In order to achieve the purpose, the invention designs a large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method, which comprises the following steps:
s1, measuring and paying off, establishing a coordinate control network, determining the axis of a pipeline strictly according to a construction drawing, and then paying off the excavation lines of the pile sites and the foundation grooves of the jet grouting piles, wherein the precision meets the design requirement;
s2, keeping navigation of at least one side of the water channel smooth; after the dredger is towed to a construction site by the working boat, the dredger distributes anchors according to the built coordinate control network according to the ship position displayed by the shipborne GPS positioning system;
s3, excavating a foundation trench by the dredger in a sectional, layered and strip-division construction mode, excavating a foundation trench slope in a stepped mode, and transporting sludge generated by excavating the foundation trench along the channel by the dredger;
s4, foundation trench construction detection and repair.
Preferably, in the step S3, the immersed tube foundation trench is constructed in a segmented organization along the extending direction of the channel with a segmented length of 100 m/section, and each section of construction adopts a construction scheme of parallel channels with a width of 10 m/section and layered excavation.
Preferably, the foundation trench side slope is constructed in an overexcavation and underrun mode, so that the foundation trench is close to the designed side slope after natural collapse.
Preferably, when the thickness of the foundation trench side slope mud is shallow, the quincuncial dredging method can be adopted for construction.
Preferably, in step S3, a length mark is made on the reverse shovel arm of the dredger during the construction process, and an operator determines the bucket-down depth according to the water level, and detects the depth just dug with the water consumption of the ship technician, so that the bucket-down depth needs to meet the construction requirement.
Preferably, the foundation trench construction detection requirement in step S4 includes: plane control: the plane control is controlled by a satellite positioning system with the error less than 1.0 m; depth control: and setting a water gauge for observing the water level in the shallow water area at the bank, wherein the zero point of the water gauge is when the water level is at the lowest surface of the theory, and determining the dredging thickness and the bucket-down depth by combining the water depth and the water level of the pre-dredging measurement map.
Preferably, the construction detection and repair comprises measuring and drawing by a depth finder, finding shallow points, and repairing and sweeping shallow points according to blocks.
Preferably, after the repair digging and shallow cleaning work is completed, comprehensive retest measurement is carried out, retests are failed, and repair digging and retests are carried out until the test is passed.
The invention has the beneficial effects that:
the invention can realize river-crossing construction in an offshore complex geographic environment, and ensures the construction quality through strict construction detection and repair.
Drawings
Fig. 1 is a construction flow chart of the present invention.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
The invention will be further described with reference to the drawings and the specific examples.
Example 1
The method for excavating and constructing the large-pipe-diameter river-crossing immersed tube underwater foundation trench shown in fig. 1 comprises the following steps:
s1, measuring and paying off, establishing a coordinate control network, determining the axis of a pipeline strictly according to a construction drawing, and then paying off the excavation lines of the pile sites and the foundation grooves of the jet grouting piles, wherein the precision meets the design requirement;
s2, keeping navigation of at least one side of the water channel smooth; after the dredger is towed to a construction site by the working boat, the dredger distributes anchors according to the built coordinate control network according to the ship position displayed by the shipborne GPS positioning system;
s3, excavating a foundation trench by adopting a sectional, layered and strip-separated construction mode by the dredger, adopting stepped excavation construction by a foundation trench slope, and transporting sludge generated by excavating the foundation trench along a channel by the dredger; the immersed tube foundation grooves are constructed in a sectional mode along the extending direction of the channel by a sectional length of 100 m/section, and each section of construction adopts a construction scheme that parallel channels are excavated in a sectional mode by 10 m/section of width. In the construction process, length marks are made on the reverse shovel arm of the dredger, an operator determines the bucket-down depth according to the water level, the newly dug depth is detected with water consumption of a ship technician, and the bucket-down depth needs to meet the construction requirement. The foundation trench side slope is constructed in an overexcavation and underrun mode, so that the foundation trench is close to the designed side slope after natural collapse. When the thickness of the foundation trench side slope mud is shallow, the quincuncial dredging method can be adopted for construction.
S4, foundation trench construction detection and repair. The foundation trench construction detection requirements include: plane control: the plane control is controlled by a satellite positioning system with the error less than 1.0 m; depth control: and setting a water gauge for observing the water level in the shallow water area at the bank, wherein the zero point of the water gauge is when the water level is at the lowest surface of the theory, and determining the dredging thickness and the bucket-down depth by combining the water depth and the water level of the pre-dredging measurement map. The construction detection and repair comprise measuring by a depth finder, drawing, finding shallow points, and repairing and sweeping according to blocks. And after the repair digging and shallow sweeping work is finished, carrying out comprehensive retest measurement, retesting unqualified, and repairing the repair digging and retesting until the test is qualified.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (8)
1. A large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method is characterized by comprising the following steps of: the method comprises the following steps:
s1, measuring and paying off, establishing a coordinate control network, determining the axis of a pipeline strictly according to a construction drawing, and then paying off the excavation lines of the pile sites and the foundation grooves of the jet grouting piles, wherein the precision meets the design requirement;
s2, keeping navigation of at least one side of the water channel smooth; after the dredger is towed to a construction site by the working boat, the dredger distributes anchors according to the built coordinate control network according to the ship position displayed by the shipborne GPS positioning system;
s3, excavating a foundation trench by the dredger in a sectional, layered and strip-division construction mode, excavating a foundation trench slope in a stepped mode, and transporting sludge generated by excavating the foundation trench along the channel by the dredger;
s4, foundation trench construction detection and repair.
2. The large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method of claim 1, wherein the method comprises the following steps of: in the step S3, the immersed tube foundation grooves are constructed in a segmented mode along the extending direction of the channel and with the segmented length of 100 m/section, and the parallel channels are constructed by adopting a construction scheme of dividing the parallel channels into strips with the width of 10 m/strip and excavating the parallel channels in a layered mode during each section of construction.
3. The large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method of claim 1, wherein the method comprises the following steps of: the foundation trench side slope is constructed in an overexcavation and underrun mode, so that the foundation trench is close to the designed side slope after natural collapse.
4. The large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method of claim 3, wherein the method comprises the following steps of: when the thickness of the foundation trench side slope mud is shallow, the quincuncial mud-dredging method can be adopted for construction.
5. The large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method of claim 1, wherein the method comprises the following steps of: in the step S3, length marks are made on the reverse shovel arm of the dredger in the construction process, an operator determines the bucket-down depth according to the water level, and the bucket-down depth needs to meet the construction requirement along with the fact that the marine technician uses water to detect the depth just dug.
6. The large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method of claim 1, wherein the method comprises the following steps of: the foundation trench construction detection requirements in the step S4 comprise: plane control: the plane control is controlled by a satellite positioning system with the error less than 1.0 m; depth control: and setting a water gauge for observing the water level in the shallow water area at the bank, wherein the zero point of the water gauge is when the water level is at the lowest surface of the theory, and determining the dredging thickness and the bucket-down depth by combining the water depth and the water level of the pre-dredging measurement map.
7. The large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method of claim 6, wherein the method is characterized by comprising the following steps of: the construction detection and repair comprise measuring and drawing by using a sounding instrument, finding shallow points, and repairing and sweeping shallow points according to blocks.
8. The large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method of claim 7, wherein the method comprises the following steps of: and after the repair digging and shallow sweeping work is finished, carrying out comprehensive retest measurement, retesting unqualified, and repairing the repair digging and retesting until the repair digging and shallow sweeping work is qualified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311872629.0A CN117846016A (en) | 2023-12-29 | 2023-12-29 | Large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311872629.0A CN117846016A (en) | 2023-12-29 | 2023-12-29 | Large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117846016A true CN117846016A (en) | 2024-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311872629.0A Pending CN117846016A (en) | 2023-12-29 | 2023-12-29 | Large-pipe-diameter river-crossing immersed tube underwater foundation trench excavation construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117846016A (en) |
-
2023
- 2023-12-29 CN CN202311872629.0A patent/CN117846016A/en active Pending
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