CN111236250A - Method for quickly removing foundation pit support at onshore section joint of immersed tube tunnel - Google Patents
Method for quickly removing foundation pit support at onshore section joint of immersed tube tunnel Download PDFInfo
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- CN111236250A CN111236250A CN202010051151.5A CN202010051151A CN111236250A CN 111236250 A CN111236250 A CN 111236250A CN 202010051151 A CN202010051151 A CN 202010051151A CN 111236250 A CN111236250 A CN 111236250A
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- foundation pit
- support
- onshore
- section
- immersed tube
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- 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
- E02D29/063—Tunnels submerged into, or built in, open water
- E02D29/073—Tunnels or shuttering therefor assembled from sections individually sunk onto, or laid on, the water-bed, e.g. in a preformed trench
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Foundations (AREA)
Abstract
The invention discloses a method for quickly removing a foundation pit support at a connector of an onshore section of a immersed tube tunnel, which comprises the following steps: constructing a steel pipe pile and a middle upright column, excavating a foundation pit, and synchronously constructing a plurality of supports; step two, after the foundation pit is excavated to the base, constructing a main structure of the tunnel at the onshore section and a retaining wall at the top of the main structure at the near water end in the foundation pit; step three, when water is poured into the foundation pit to the lower surface of the support, the layer of support is removed, and the rest is done in the same way until all the supports are removed; and fourthly, after excavating the underwater foundation trench of the immersed tube in the region, removing the steel pipe pile, and carrying out sinking butt joint on the immersed tube section and the onshore section. According to the invention, only water is needed to be poured into the foundation pit, and the poured water is used for replacing the backfilled sand, so that secondary excavation of the backfilled sand in the foundation pit is avoided, the construction procedures and the construction period are reduced, and the construction cost is reduced; the method has simple construction process and is suitable for various types of onshore joints of the immersed tube tunnel.
Description
Technical Field
The invention relates to the technical field of immersed tube tunnels, in particular to a construction method for quickly removing a foundation pit supporting structure at a joint of an immersed tube section and an onshore section.
Background
At present, after a main structure in a foundation pit at a connector position on an onshore section of a sinking pipe section tunnel is constructed, sand is firstly backfilled into the foundation pit to balance the water and soil pressure outside the foundation pit, then an inner support of the foundation pit at the position is removed, and after a steel pipe pile is cut off, pipe sections can be sunk and butted.
The existing construction method for butting the onshore section and the immersed tube section of the immersed tube tunnel mainly has the following defects:
1) the method needs to backfill sand, and the backfill sand needs to be removed at the later stage, so that the construction is troublesome and the construction cost is high;
2) because there is no construction space after the backfill sand in the foundation pit, only the steel pipe piles above the river bed surface or the top surface of the backfill sand can be cut off, and the residual lower steel pipe piles are difficult to clean in the later foundation pit excavation process.
Disclosure of Invention
The invention aims to provide a method for quickly removing a foundation pit support at a connector of an onshore section of a immersed tube tunnel, which uses irrigation to replace backfill sand and avoids secondary excavation.
In order to achieve the purpose, the specific technical scheme of the method for quickly dismantling the foundation pit support at the shore section joint of the immersed tube tunnel is as follows:
a method for quickly dismantling a foundation pit support at a joint of an onshore section of a immersed tube tunnel comprises the following steps:
constructing a steel pipe pile and a middle upright column, excavating a foundation pit, and synchronously constructing a plurality of supports;
step two, after the foundation pit is excavated to the base, constructing a main structure of the tunnel at the onshore section and a retaining wall at the top of the main structure at the near water end in the foundation pit;
step three, when water is poured into the foundation pit to the lower surface of the support, the layer of support is removed, and the rest is done in the same way until all the supports are removed;
and fourthly, after excavating the underwater foundation trench of the immersed tube in the region, removing the steel pipe pile, and carrying out sinking butt joint on the immersed tube section and the onshore section.
Further, in step one: in the process of excavating the foundation pit, a plurality of layers of lateral supports are arranged between the steel pipe piles on the two sides from bottom to top through concrete waist beams.
Further, in step two: and in the process of dismantling the lateral support, correspondingly excavating soil on the outer side of the foundation pit of the steel pipe pile according to the stress calculation requirement of the steel pipe pile.
Further, in step three: and (3) irrigating water into the foundation pit, adding water to the lower surface of the support at the bottommost part, removing the lateral support at the bottommost part in the foundation pit, continuously adding water, and repeating the steps until all the supports are removed.
The method for quickly dismantling the foundation pit support at the onshore section joint of the immersed tube tunnel has the advantages that:
1) only water is needed to be poured into the foundation pit, and the poured water is used for replacing backfill sand, so that the foundation pit backfill sand is avoided, and the method is simple and convenient in construction process;
2) the secondary excavation under water after sand backfilling in the range of the foundation pit of the onshore section is avoided, the construction procedures and the construction period are reduced, the construction cost is reduced, and the method is suitable for various onshore section joints of the immersed tube tunnel.
Drawings
FIG. 1 is a first schematic plan view of the shoreside segment joint foundation pit support of the present invention;
FIG. 2 is a schematic plan view of a second plane layout of the foundation pit support at the shore segment joint of the present invention;
FIG. 3 is a schematic longitudinal section of a foundation pit at a joint of an onshore segment according to the present invention;
FIG. 4 is a cross-sectional view of the undetached body structure of the present invention prior to upper support;
figure 5 is a cross-sectional view of the present invention with the upper support of the body structure removed.
In the figure: 1. supporting; 2. steel pipe piles; 3. a middle upright post; 4. a body structure; 5. retaining walls; 6. a watering area; 7. a concrete wale; 8. a concrete pad.
Detailed Description
In order to better understand the purpose, structure and function of the present invention, the following will describe in detail a method for quickly removing a foundation pit support at a joint on the shore section of a immersed tunnel according to the present invention with reference to the accompanying drawings.
As shown in fig. 1 to 5, it is shown that the method for quickly removing the foundation pit support at the onshore section joint of the immersed tunnel of the present invention comprises the following steps:
step one, constructing a building enclosure structure, and excavating a foundation pit to a base.
Specifically, a foundation pit is excavated after the steel pipe pile 2 and the temporary middle upright post 3 are constructed, when the lower surface of the first layer of support 1 is excavated, the support 1 is constructed, and then the remaining multiple layers of supports 1 are constructed in sequence in the excavation process continuously until the foundation pit is excavated to the substrate.
The steel pipe piles 2 of the support 1 are connected through a concrete wale 7.
Secondly, laying a concrete cushion 8 to the bottom of the foundation pit, and constructing an onshore section tunnel main body structure 4 and a retaining wall 5 at the top of the main body structure 4 at the near water end on the concrete cushion 8;
and step three, when water is poured into the foundation pit to the lower surface of the support 1, the support 1 is removed, and a water pouring area 6 is shown in the figure. And so on until all the supports 1 are completely removed.
Specifically, when the main body structure 4 and the retaining wall 5 reach the strength capable of resisting and bearing the water pressure, water is poured into the foundation pit, and when the water is added to the lower surface of the bottommost support 1, the bottommost support 1 in the foundation pit is removed;
and continuously irrigating water into the foundation pit, and when the water reaches the lower surface of each layer of support 1, sequentially removing the multiple layers of supports 1 from bottom to top.
In addition, in the process of dismantling the lateral support 1, if the stress of the steel pipe pile 2 does not meet the calculation requirement, soil except for the steel pipe pile 2 can be correspondingly excavated.
Through the steps, the foundation pit is filled with water, and the filling sand is replaced by the filling water, so that the foundation pit is prevented from being filled with the sand, the construction is simple and convenient, and the method is suitable for various types of onshore joints of the immersed tube tunnel.
And fourthly, after all the supports 1 in the foundation pit are completely removed and the underwater foundation trench is excavated, cutting off the steel pipe pile 2 above the bottom surface of the foundation pit, and then realizing the sinking butt joint of the pipe joints and the onshore sections.
The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.
Claims (4)
1. A method for quickly removing a foundation pit support at a joint of an onshore section of a immersed tube tunnel is characterized by comprising the following steps:
firstly, constructing a steel pipe pile (2) and a middle upright post (3), excavating a foundation pit, and synchronously constructing a plurality of supports (1);
step two, after the foundation pit is excavated, constructing a tunnel main body structure (4) at the ashore section and a retaining wall (5) at the top of the main body structure (4) at the near water end in the foundation pit;
step three, when water is poured into the foundation pit to the lower surface of the support (1), the layer of support (1) is removed, and the rest is done in the same way until all the supports (1) are removed;
and fourthly, after excavating the underwater foundation trench of the immersed tube in the region, dismantling the steel pipe pile (2), and carrying out sinking butt joint on the immersed tube section and the onshore section.
2. The method for rapidly removing the foundation pit support at the onshore section joint of the immersed tunnel according to claim 1, wherein in the first step: in the process of excavating the foundation pit, a plurality of layers of lateral supports are arranged between the steel pipe piles on the two sides from bottom to top through concrete waist beams.
3. The method for rapidly removing the foundation pit support at the onshore section joint of the immersed tunnel according to claim 1, wherein in the second step: and in the process of dismantling the lateral support (1), correspondingly excavating soil on the outer side of the foundation pit of the steel pipe pile (2) according to the stress calculation requirement of the steel pipe pile (2).
4. The method for rapidly removing the foundation pit support at the onshore section joint of the immersed tunnel according to claim 1, wherein in the third step: and (3) irrigating water into the foundation pit, adding water to the lower surface of the support (1) at the bottommost part, removing the lateral support (1) at the bottommost part in the foundation pit, continuously adding water, and repeating the steps until all the supports (1) are removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010051151.5A CN111236250A (en) | 2020-01-17 | 2020-01-17 | Method for quickly removing foundation pit support at onshore section joint of immersed tube tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010051151.5A CN111236250A (en) | 2020-01-17 | 2020-01-17 | Method for quickly removing foundation pit support at onshore section joint of immersed tube tunnel |
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| CN111236250A true CN111236250A (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010051151.5A Pending CN111236250A (en) | 2020-01-17 | 2020-01-17 | Method for quickly removing foundation pit support at onshore section joint of immersed tube tunnel |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139838A (en) * | 2007-10-15 | 2008-03-12 | 上海市隧道工程轨道交通设计研究院 | Construction method for high artesian area ultra-deep foundation pit |
| CN103122642A (en) * | 2013-01-30 | 2013-05-29 | 上海市政工程设计研究总院（集团）有限公司 | Construction method of vertical post support change |
| CN105064372A (en) * | 2015-08-04 | 2015-11-18 | 中交二航局第四工程有限公司 | Foundation pit backfill sand vibration compaction method |
| KR20150143952A (en) * | 2014-06-13 | 2015-12-24 | 한국철도기술연구원 | Method for constructing underground structure having precast wall using h-pile, method for connecting precast wall and slab |
| CN105239578A (en) * | 2015-08-28 | 2016-01-13 | 中交第二航务工程局有限公司 | Water-rich sand layer deep foundation pit underwater construction method |
-
2020
- 2020-01-17 CN CN202010051151.5A patent/CN111236250A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139838A (en) * | 2007-10-15 | 2008-03-12 | 上海市隧道工程轨道交通设计研究院 | Construction method for high artesian area ultra-deep foundation pit |
| CN103122642A (en) * | 2013-01-30 | 2013-05-29 | 上海市政工程设计研究总院（集团）有限公司 | Construction method of vertical post support change |
| KR20150143952A (en) * | 2014-06-13 | 2015-12-24 | 한국철도기술연구원 | Method for constructing underground structure having precast wall using h-pile, method for connecting precast wall and slab |
| CN105064372A (en) * | 2015-08-04 | 2015-11-18 | 中交二航局第四工程有限公司 | Foundation pit backfill sand vibration compaction method |
| CN105239578A (en) * | 2015-08-28 | 2016-01-13 | 中交第二航务工程局有限公司 | Water-rich sand layer deep foundation pit underwater construction method |
Non-Patent Citations (1)
| Title |
|---|
| 汪海洋: "佛山沉管隧道干坞及护岸工程施工关键技术", 《广东水利水电》 * |
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Application publication date: 20200605 |