CN111350208A - Immersed tube tunnel pipe section prefabricating method - Google Patents
Immersed tube tunnel pipe section prefabricating method Download PDFInfo
- Publication number
- CN111350208A CN111350208A CN202010185928.7A CN202010185928A CN111350208A CN 111350208 A CN111350208 A CN 111350208A CN 202010185928 A CN202010185928 A CN 202010185928A CN 111350208 A CN111350208 A CN 111350208A
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- Prior art keywords
- pipe
- pipe joint
- prefabricated
- prefabricating
- pipe section
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Classifications
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
Abstract
The invention discloses a method for prefabricating a pipe section of an immersed tunnel, which comprises the following steps: binding steel bars and pouring pipe joints in the shallow dry dock; step two, arranging a steel end shell, a steel end sealing wall and a guide device at both ends of the pipe joint; step three, constructing a waterproof layer of the pipe joint; step four, prefabricating the prefabricated slab in a prefabricating site beside the assembling platform synchronously; opening a dock gate, and carrying the pipe joints to an assembly platform in a floating mode, wherein a hoisting system is arranged on the assembly platform; hoisting the precast slabs to the corresponding positions of the pipe joints through a hoisting system; step seven, applying a waterproof layer above the precast slab; and step eight, dragging the pipe joints to a specified position, and sinking the pipe joints after outfitting. The pipe joint floating transportation process has shallow draft, less temporary engineering, less or no need of dredging in water, less environmental influence and streamlined operation.
Description
Technical Field
The invention relates to the technical field of immersed tube tunnels, in particular to a method for prefabricating a tube section of an immersed tube tunnel.
Background
The tunnel pipe joint adopting the immersed tube method prefabricated by the dry dock of the deep foundation pit or the dry dock of the land factory method becomes the mainstream of the construction technology of the construction method in China after long-term practice, summarization and improvement, and the two methods are most widely applied in the world, so that the method has the advantages of construction period saving, low construction risk and high temporary cost and environmental cost due to the fact that large-area land needs to be occupied. The semi-submersible barge is taken as a prefabricated platform, is early started, but is limited by the width of the hull, has strict requirements on navigation of surrounding water areas, is expensive in rent and the like, has no wide adaptability and can only be considered as a specific case.
With the rapid development of intensive cities, tunnel construction engineering conditions become more and more complex, and especially under the conditions of shortage of land resources, difficulty in land acquisition and higher requirements and conditions for environmental protection, the feasibility of the scheme of prefabricating the pipe joints by the dry dock of the deep foundation pit or the land factory method becomes lower and lower. How to solve the requirement of the tunnel by the immersed tube method on the peripheral land in the building process and reduce the influence on the peripheral environment so as to better adapt to the building of dense urban areas is a key factor for adapting to the social development.
Disclosure of Invention
The invention aims to provide a method for prefabricating a immersed tube tunnel pipe section, which does not need a large temporary deep foundation pit dry dock, can utilize an existing dock, a semi-submersible barge or a shallow foundation pit of an onshore structure as a prefabricated platform of the immersed tube tunnel pipe section, designs a top plate of the pipe section into a grid type frame structure, reduces the weight of the pipe section, reduces the draught depth of the pipe section, blocks holes between the grid type frame structures of the top plate by prefabricated plates, and then carries the pipe section to a sinking point in a floating mode. The pipe joint floating transportation process has shallow draft, less temporary engineering, less or no need of dredging in water, less environmental influence and streamlined operation.
In order to achieve the purpose, the concrete technical scheme of the method for prefabricating the immersed tube tunnel pipe section is as follows:
a method for prefabricating a pipe section of a immersed tunnel comprises the following steps:
binding steel bars and pouring pipe joints in the shallow dry dock;
step two, arranging a steel end shell, a steel end sealing wall and a guide device at both ends of the pipe joint;
step three, constructing a waterproof layer of the pipe joint;
step four, prefabricating the prefabricated slab in a prefabricating site beside the assembling platform synchronously;
opening a dock gate, and carrying the pipe joints to an assembly platform in a floating mode, wherein a hoisting system is arranged on the assembly platform;
hoisting the precast slabs to the corresponding positions of the pipe joints through a hoisting system;
step seven, applying a waterproof layer above the precast slab;
and step eight, dragging the pipe joints to a specified position, and sinking the pipe joints after outfitting.
Further, in the first step, the pipe joints are poured, and except the hole opening area of the top plate on the pipe joints, the rest of the pipe joints are prefabricated in the shallow dry dock.
Further, in the first step, the shallow dry dock prefabricated platform can adopt a newly excavated foundation pit, and the depth is determined according to the pipe joint floating transportation requirement so as to reduce the dredging amount in water.
Further, in the first step, the shallow dry dock prefabricating platform can also utilize a dock around the tunnel site, a semi-submersible barge or a main structure foundation pit on the shore of the tunnel to build a pipe joint, and the depth is determined according to the floating transportation requirement of the pipe joint so as to reduce the dredging amount in water.
Further, the size of the open hole area in the first step is determined according to the water depth of the water area where the engineering is located, so that the pipe joints are guaranteed not to conduct dredging and excavating on the existing river channels in the floating transportation process.
Further, in the first step, when the pipe joints are poured, water stop belts, grouting pipes and water-swelling water stop strips are arranged at corresponding positions on the periphery of the precast slab.
Further, in the first step, the top plate of the pipe joint is designed to be a grid type frame structure, and holes between the grid type frame structures are blocked by precast slabs.
And further, in the fifth step, the splicing platform selects the existing wharf or large and medium-sized sinking ships around the tunnel site.
And further, in the fifth step, a hoisting system is arranged on the assembling platform, and the hoisting distance is determined according to the width requirement of the pipe joint top plate framework.
Further, in the sixth step, gaps between the periphery of the precast slab and the pipe joints are plugged through epoxy resin, and the top plates are symmetrically installed from two ends to the middle.
The method for prefabricating the immersed tube tunnel pipe section has the beneficial effects that:
1) when the newly built deep foundation pit dry dock is adopted, the requirement on the depth of the dry dock can be effectively reduced, the requirement on the time occupied by the land is reduced, the dredging amount in water is reduced, and the construction cost and the construction period are saved;
2) the semi-submersible barge body is adopted for prefabrication, the semi-submersible barge has shallow draft and high channel adaptability, the dredging amount of a submerged harbor pool can be reduced, and the lease cost of a semi-submersible barge ship is saved;
3) the axial line of the foundation pit of the on-shore main structure is utilized for construction, the construction is not limited by the depth of the foundation pit, more prefabricated pipe sections are provided, the construction conditions are parallel to those of the on-shore structure, no extra dredging amount is needed, the transportation mode is flexible, and the construction process is mature;
4) the holes of the top plate grid type frame structure are spliced by the precast slabs, and the precast slabs and the cast-in-place plates are pressed and connected through the upper hydraulic power, so that the process is simple, and the safety and reliability are high;
5) the method has the advantages of high center of gravity and good stability under the floating condition of the pipe joint, can be operated in a streamlined mode, can be combined with the surrounding environment according to local conditions, and can control the secondary pouring operation condition.
Drawings
FIG. 1 is a schematic view of a prefabricated and assembled planar structure of a pipe joint according to the present invention;
FIG. 2 is a schematic structural view of a prefabricated and assembled longitudinal section of a pipe joint according to the present invention;
FIG. 3 is a schematic diagram of a prefabricated and assembled cross section structure of the pipe joint of the present invention;
FIG. 4 is a schematic structural diagram of a water-proof bulk structure of the prefabricated panel and the main body structure of the present invention.
In the figure: 1. pipe joints; 2. prefabricating a slab; 3. a steel end shell; 4. sealing the steel end with a wall; 5. a water stop; 6. a water-swelling sealing strip when meeting water; 7. and (4) grouting pipes.
Detailed Description
In order to better understand the purpose, structure and function of the present invention, the method for prefabricating the immersed tube tunnel tube section of the present invention is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1 to 4, the method for prefabricating the immersed tube tunnel pipe section of the present invention comprises the following specific steps:
step one, binding steel bars in the shallow dry dock and pouring a pipe section 1.
When the pipe joint 1 is poured, the rest of the prefabricated plates are prefabricated in the shallow dry dock except for the hole opening area of the prefabricated plate 2 on the pipe joint 1.
The shallow dry dock prefabricated platform can adopt a newly excavated foundation pit, and the depth is determined according to the pipe joint floating transportation requirement so as to reduce the dredging amount in water.
The shallow dry dock prefabricated platform can also utilize a dock around a tunnel site, a semi-submersible barge or a main structure foundation pit on a tunnel shore to build a pipe joint, and the depth is determined according to the floating transportation requirement of the pipe joint so as to reduce the dredging amount in water.
The size of the opening area is determined according to the water depth of the water area where the engineering is located, so that the pipe joints 1 are ensured not to conduct dredging excavation on the existing river channels in the floating transportation process.
When the pipe joint 1 is poured, the small GINA water stop band 5, the grouting pipe 7 and the water-swelling water stop strip 6 are arranged at corresponding positions on the periphery of the prefabricated plate 2.
Wherein, the roof design of tube coupling 1 is grid formula frame construction, and the hole later stage between the grid formula frame construction adopts prefabricated plate 2 to block up.
And step two, arranging a steel end shell 3, a steel end sealing wall 4 and a guiding device at two ends of the pipe joint 1.
Step three, constructing an external waterproof layer of the pipe joint 1;
and step four, prefabricating the prefabricated slab 2 in a prefabricating site beside the assembling platform synchronously.
And step five, opening a dock gate, and carrying the pipe joint 1 to an assembly platform in a floating mode, wherein the assembly platform is provided with a hoisting system.
Wherein, the hoisting distance is determined according to the width requirement of the pipe joint top plate frame.
Wherein, the splicing platform selects an existing wharf or large and medium-sized sinking ship around the tunnel; the large and medium-sized sinking ship can also be used as a pipe joint mooring and sinking platform.
And sixthly, hoisting the prefabricated plate 2 to the corresponding position of the pipe joint 1 through a hoisting system for installation.
Wherein, gaps between the periphery of the precast slab 2 and the pipe joint 1 are plugged by epoxy resin.
Wherein, the prefabricated panels 2 are symmetrically installed from two ends to the middle in the installation sequence.
And step seven, applying a waterproof layer above the precast slab 2.
And step eight, dragging the pipe joint 1 to a specified position to carry out outfitting and then sinking.
A method for prefabricating a pipe joint of a immersed tube tunnel adopts a newly built deep foundation pit dry dock, can effectively reduce the requirement on the depth of the dry dock, reduce the requirement on the time occupied by land, reduce the dredging amount in water and save the construction cost and the construction period; the semi-submersible barge body is adopted for prefabrication, the semi-submersible barge has shallow draft and high channel adaptability, the dredging amount of a submerged harbor pool can be reduced, and the lease cost of a semi-submersible barge ship is saved; the construction is carried out by utilizing the axis of the foundation pit of the onshore main structure, the construction is not limited by the depth of the foundation pit, more prefabricated pipe sections are provided, the construction has parallel operation conditions with the onshore structure, no extra dredging amount is needed, the transportation mode is flexible, and the construction process is mature. The holes of the top plate grid type frame structure are spliced by the prefabricated plates, and the prefabricated plates and the cast-in-place plates are connected through upper hydraulic compression, so that the process is simple, and the safety and reliability are high. The method has the advantages of high center of gravity and good stability under the floating condition of the pipe joint, can be operated in a streamlined mode, can be combined with the surrounding environment according to local conditions, and can control the secondary pouring operation condition.
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 (10)
1. A method for prefabricating a immersed tube tunnel pipe section is characterized by comprising the following steps:
binding steel bars and pouring pipe joints (1) in the shallow dry dock;
step two, arranging a steel end shell (3), a steel end sealing wall (4) and a guide device at both ends of the pipe joint (1);
constructing a waterproof layer of the pipe joint (1);
step four, prefabricating the prefabricated slab (2) in a prefabricated site beside the splicing platform synchronously;
opening a dock gate, and carrying the pipe joint (1) to an assembly platform in a floating mode, wherein a hoisting system is arranged on the assembly platform;
hoisting the prefabricated plate (2) to the corresponding position of the pipe joint (1) through a hoisting system;
step seven, applying a waterproof layer above the precast slab (2);
and step eight, dragging the pipe joint (1) to a specified position for outfitting and then sinking.
2. The prefabrication method according to claim 1, characterized in that in the first step, when the pipe section (1) is poured, the prefabricated plate (2) on the pipe section (1) is prefabricated in a shallow dry dock except for an open hole area.
3. The prefabrication method according to claim 1, wherein in the first step, the shallow dry dock prefabrication platform adopts a newly excavated foundation pit, and the depth is determined according to the pipe section floating requirement so as to reduce the dredging amount in water.
4. The prefabrication method according to claim 1, wherein in the first step, the shallow dry dock prefabrication platform utilizes a tunnel site peripheral dock, a semi-submersible barge or a main structure foundation pit on a tunnel shore to build a pipe section, and the depth is determined according to the floating requirement of the pipe section so as to reduce the dredging amount in water.
5. The prefabrication method according to claim 2, characterized in that the size of the open area in step one is determined according to the depth of the water area where the project is located, so as to ensure that the pipe sections (1) are not dredged and excavated to the existing river channels during the floating transportation.
6. The prefabrication method according to claim 1, characterized in that in the first step, when the pipe joint (1) is poured, a water stop (5), a grouting pipe (7) and a water-swelling water stop strip (6) are arranged at corresponding positions on the periphery of the prefabricated plate (2).
7. Prefabrication method according to claim 1, characterised in that in step one, the top plate of the pipe section (1) is designed as a grid-type frame structure, and the holes between the grid-type frame structures are blocked by prefabricated plates (2).
8. The prefabrication method according to claim 1, wherein in the fifth step, the splicing platform is an existing wharf or a large and medium-sized sunken ship around the tunnel site.
9. The prefabricating method according to claim 1, wherein in the fifth step, a hoisting system is arranged on the assembling platform, and the hoisting distance is determined according to the width requirement of the pipe joint top plate frame.
10. The prefabrication method according to claim 1, characterized in that in the sixth step, gaps between the peripheries of the prefabricated plates (2) and the pipe joints (1) are blocked through ring resin, and the prefabricated plates (2) are symmetrically installed from two ends to the middle in the installation sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010185928.7A CN111350208A (en) | 2020-03-17 | 2020-03-17 | Immersed tube tunnel pipe section prefabricating method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010185928.7A CN111350208A (en) | 2020-03-17 | 2020-03-17 | Immersed tube tunnel pipe section prefabricating method |
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| CN111350208A true CN111350208A (en) | 2020-06-30 |
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| CN202010185928.7A Pending CN111350208A (en) | 2020-03-17 | 2020-03-17 | Immersed tube tunnel pipe section prefabricating method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111827355A (en) * | 2020-07-30 | 2020-10-27 | 叶明然 | Immersed tube tunnel and construction method |
| CN113638446A (en) * | 2021-08-18 | 2021-11-12 | 中铁隧道勘测设计院有限公司 | Immersed tube segment batch prefabricating method capable of reducing scale of dry dock |
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| CN111827355A (en) * | 2020-07-30 | 2020-10-27 | 叶明然 | Immersed tube tunnel and construction method |
| CN113638446A (en) * | 2021-08-18 | 2021-11-12 | 中铁隧道勘测设计院有限公司 | Immersed tube segment batch prefabricating method capable of reducing scale of dry dock |
| CN113638446B (en) * | 2021-08-18 | 2022-09-06 | 中铁隧道勘测设计院有限公司 | Immersed tube segment batch prefabricating method capable of reducing scale of dry dock |
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