CN113638446A - Immersed tube segment batch prefabricating method capable of reducing scale of dry dock - Google Patents
Immersed tube segment batch prefabricating method capable of reducing scale of dry dock Download PDFInfo
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- CN113638446A CN113638446A CN202110946504.2A CN202110946504A CN113638446A CN 113638446 A CN113638446 A CN 113638446A CN 202110946504 A CN202110946504 A CN 202110946504A CN 113638446 A CN113638446 A CN 113638446A
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- pipe joint
- immersed tube
- dry dock
- site
- open type
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/08—Sinking workpieces into water or soil inasmuch as not provided for elsewhere
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0061—Production methods for working underwater
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
Abstract
The invention relates to a method for prefabricating immersed tube sections in batches, which can reduce the scale of dry docks and comprises the following steps: (1) in the small temporary dry dock, part of components of the immersed tube joint, including a bottom plate, part of side walls, a middle partition wall and two end sealing doors, are prefabricated for the first time to form an open type tube joint similar to a ship, so that the dead weight of the tube joint is reduced as much as possible, and the draught depth of the tube joint is reduced; (2) dragging the pipe joint to the vicinity of the tunnel site; (3) selecting a prefabricated site without accumulating silt in water, leveling, sinking a plurality of uninflated air bags in the site, anchoring the air bags at the bottom of the river, and inflating the air bags; (4) slowly seating the tube segments on the inflated airbag structure; (5) and pouring the rest side wall and the top plate reinforced concrete part of the pipe joint for the second time to finish the integral prefabrication of the immersed tube pipe joint. The method for prefabricating the immersed tube sections in batches has the advantages of small engineering quantity and small influence on the environment, and can effectively reduce the field area of the temporary dry dock, the depth of a foundation pit and the hauling difficulty of the tube sections.
Description
Technical Field
The invention relates to the field of immersed tube tunnels, in particular to a method for prefabricating immersed tube sections in batches, which can reduce the occupied area of a dry dock and reduce the depth of a foundation pit of the dry dock.
Background
The immersed tube tunnel is an underwater tunnel built by immersed tube joints through the procedures of prefabrication in dry dock, hauling, sinking and butting, foundation treatment, backfilling and covering and the like. The tunnel has the advantages of shallow buried depth, short tunnel length and flexible connection with roads on both sides of a water area, can greatly save land resources in a central urban area after being successfully constructed, and is one of the main methods for constructing underwater tunnels in cities.
At present, the prefabrication method of the immersed tube tunnel pipe section mainly comprises two methods: the other one is the integral prefabrication of the reinforced concrete pipe joint, and the other one is the floating prefabrication of the steel shell pipe joint. The integral prefabrication of the pipe joints refers to the construction that after the pipe joints are prefabricated in the large dry dock at one time, outfitting members are installed, and the pipe joints are integrally hauled to a tunnel site to be sunk and butted and the like; the steel shell pipe joint is prefabricated in a floating state for two times, a steel shell is built firstly and is hauled to the position near a tunnel, concrete is poured into the steel shell pipe joint in the floating state, a cavity between the steel shells is filled, pipe joint outfitting is completed, and then the steel shell pipe joint is hauled to the tunnel site to be sunk and butted and the like; in the pipe joint prefabricating process, the purpose of pouring concrete is mainly to fill and play a role in weight. The two existing immersed tube tunnel pipe section prefabricating methods mainly have the following problems in the practical application process:
integrally prefabricating a reinforced concrete pipe section:
(1) the pipe joints are prefabricated in an integral mode, the dry dock is large in scale and large in occupied area, the dry dock is used as a temporary project, the project cost is high, the waste is large, and the influence on the environment is large;
(2) the urban development is faster and faster, the land space resources are more and more tense, and the site selection of the dry dock field becomes a main restriction factor of the engineering;
(3) the pipe joints are prefabricated integrally, the requirements on hauling channels are deep, the temporary dredging cost of the channels is high, and the influence on the environment is large;
(4) the pipe joint is integrally prefabricated, has a great self weight, long pipe joint distance, tens of thousands of tons of components, is similar to an aircraft carrier, and has high hauling risk.
(II) prefabricating the steel shell pipe section in a floating state:
(1) most of the steel shell pipe sections are circular sections, and the utilization rate of the sections is not high; (2) the steel shell welding requirement is high, the process is complex, the steel quantity is large, the underwater corrosion requirement is high, and the manufacturing cost is high; (3) the steel shell pipe joint is mostly provided with an inner steel plate, an outer steel plate and a hollow middle structure, and if only a single-layer steel shell structure with an outer coating is adopted, the concrete construction requirement is high, the concrete compactness and water tightness requirements are difficult to meet, and the structural risk is high; (4) the steel shell pipe joint has a high floating core and is greatly influenced by water flow impact, the stability of the pipe joint is difficult to control in the concrete pouring process in a floating state, and the construction risk is high.
Disclosure of Invention
In order to overcome the problems and the defects in the existing process of constructing the immersed tube tunnel by integrally prefabricating the reinforced concrete pipe joints and prefabricating the steel shell pipe joints in a floating state, the invention provides a method for prefabricating the immersed tube pipe joints in batches so as to reduce the field area of a temporary dry dock, the depth of a foundation pit and the hauling difficulty of the pipe joints.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for prefabricating immersed tube sections in batches capable of reducing scale of dry dock specifically comprises the following steps:
s1, building a small temporary dry dock near the tunnel;
s2, pouring an open type pipe joint structure in the small temporary dry dock of the step S1, wherein the open type pipe joint structure comprises a pipe joint bottom plate, partial pipe joint side walls, a pipe joint middle partition wall and sealing doors arranged at two ends of the pipe joint;
s3, injecting water into the dry dock to enable the open type pipe joint structure to float in the dry dock;
s4, selecting a prefabricated site in a water area near the tunnel site, and leveling the foundation of the prefabricated site; sinking a plurality of uninflated air bags in the leveled underwater prefabricated site, anchoring the air bags at the river bottom, and inflating the air bags after anchoring;
s5, hauling the floating open type pipe joint structure in the step S3 to the underwater prefabricated site in the step S4, sinking the pipe joint structure to the inflated air bag structure, and anchoring the open type pipe joint structure through mooring lines;
s6, casting a pipe joint top plate and the rest pipe joint side wall part on the open type pipe joint structure to finish the integral prefabrication of the immersed tube pipe joint;
s7, uniformly releasing the air in the air bag, and floating the immersed tube joint in water;
and S8, dragging the prefabricated immersed tube pipe joint to a tunnel site immersed water area for immersion and butt joint.
In the above scheme, in step S1, the floor area and the dock floor elevation of the small temporary dry dock are calculated to be anti-floating according to the size and the weight of the open pipe joint structure in step S2 and the undocking water level.
In the above scheme, in the step S4, the airbag is connected with an anchor block through a cable, and the anchor block is fixed with a foundation of the prefabricated site; the air bags are arranged in sequence, and the arrangement distance between the air bags is required to meet the requirement that the air bags can be contacted with each other after being inflated.
Compared with the prior art, the invention has the following advantages and effects:
1. in the immersed tube pipe joint batch prefabrication method, the open type pipe joint structure has light dead weight and shallow draft, so that the occupied area of the temporary dry dock to be constructed is small, the depth of a foundation pit is low, a proper construction site is easy to find even in a core area of a city, the engineering quantity is small, the influence on the environment is small, the engineering cost is low, and the applicability of the immersed tube tunnel in the city is higher.
2. In the immersed tube pipe joint batch prefabrication method, the open type pipe joint structure has light weight and low floating center, and can greatly improve the long-distance hauling safety of the pipe joint; meanwhile, the pipe joints have shallow draft and low requirements on the channel, so that dredging of the existing channel can be avoided or reduced, and negative influence of construction on the environment and temporary construction cost are reduced.
3. In the immersed tube pipe joint batch prefabrication method, the open type pipe joint structure is located on the inflatable air bag, so that the pipe joint can be effectively prevented from being sucked to the bottom, and the floating capacity of the pipe joint in water is greatly improved; meanwhile, the air bag structure has the air leakage effect, so that the pipe joint can conveniently float out of a prefabricated site, and the practicability of the engineering is greatly improved.
4. In the immersed tube pipe joint batch prefabrication method, the open type pipe joint structure is located on the inflatable air bag, and then the construction of the pipe joint top plate and part of the pipe joint side wall is carried out, so that the stability, the safety and the measurement precision in the pouring process of the reinforced concrete pipe joint are greatly improved, and the compactness and the water tightness of the concrete pouring are also greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view illustrating a state of a prefabricated open type pipe joint structure in a temporary dry dock according to an embodiment of the present invention.
Fig. 2 is a schematic perspective view of an open type immersed tube segment according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a floating state of the open pipe joint structure in the temporary dry dock according to the embodiment of the present invention.
Fig. 4 is a schematic view showing a state where the air bag is anchored on the foundation of the prefabricated site according to the embodiment of the present invention.
Fig. 5 is a schematic diagram of the state that the immersed tube sections are located on a plurality of air bags in the prefabricating field after prefabricating the top plates and the side walls of the immersed tube sections.
Fig. 6 is a schematic diagram of the floating state of the immersed tube joint after the air bag is deflated.
Description of reference numerals: 1. a base plate; 2. a side wall; 3. an intermediate wall; 4. sealing the door; 5. an air bag; 6. a cable; 7. an anchor block; 8. a top plate.
Detailed Description
The present invention will be described in further detail with reference to examples, which are illustrative of the present invention and are not to be construed as being limited thereto.
Example 1: as shown in fig. 1 to 6, a method for prefabricating a sinking pipe section in batches for reducing the scale of a dry dock specifically comprises the following steps:
s1, selecting a site near the tunnel site and building a small temporary dry dock;
s2, casting an open type pipe joint structure in the small temporary dry dock built in the step S1, wherein the open type pipe joint structure comprises a pipe joint bottom plate 1, partial pipe joint side walls 2, a pipe joint middle partition wall 3 and sealing doors 4 arranged at two ends of the pipe joint, wherein: the schematic diagram of the open type pipe joint structure is shown in FIG. 2;
s3, injecting water into the dry dock to enable the open type pipe joint structure to float in the dry dock;
s4, selecting a prefabricated site without siltation in a water area near the tunnel site, and leveling the foundation of the prefabricated site; sinking a plurality of uninflated air bags 5 in the leveled underwater prefabricated site, and anchoring the air bags to the river bottom; inflating the air bag after anchoring;
as shown in fig. 4, the airbag 5 is connected with an anchor block 7 through a cable 6, and the anchor block 7 is fixed with the foundation of the prefabricated site; the air bags 5 are arranged in sequence and can be arranged in multiple rows, and the arrangement distance between the adjacent air bags 5 needs to meet the requirement that the air bags can be contacted with each other after the air bags are inflated;
s5, the open type pipe joint structure floated in the step S3 is hauled to the underwater prefabricated site in the step S4 through a floating crane ship, and is sunk to the inflated air bag structure, and the open type pipe joint structure is anchored through mooring lines;
s6, casting a pipe joint top plate 8 and the rest pipe joint side wall part on the open type pipe joint structure to finish the integral prefabrication of the immersed tube pipe joint; wherein, the schematic diagram of the integral prefabrication completion state of the pipe joint is shown as 5;
s7, after the pipe joint strength meets the design requirement, uniformly releasing the air in the air bag, and floating the immersed pipe joint in water (as shown in figure 6);
and S8, installing outfitting and other components, dragging the prefabricated immersed tube pipe joint to a tunnel site immersed water area for immersion and underwater butt joint, and finally forming the immersed tube tunnel.
Specifically, in this embodiment 1, the floor area and the dock floor elevation of the small dry dock in step S1 can be calculated by combining the undocking water level and the anti-floating calculation according to the size and the weight of the open pipe joint structure in step S2.
In the immersed tube segment batch prefabrication method according to embodiment 1 of the invention, in step S2, an open type tube segment structure similar to a ship is constructed by constructing a bottom plate, partial side walls, a middle partition wall and two end sealing doors in a small temporary dry dock, and the tube segment is prefabricated for the first time; the pipe joints are free of top plates and partial side walls, so that the pipe joints are light in dead weight, low in floating center and shallow in draft, are extremely easy to float in a foundation pit of the dry dock and are easy to haul for a long distance, and meanwhile, the pipe joints are shallow in draft, so that the requirement on a channel is low, the dredging of an existing river channel can be avoided or reduced, and the negative influence of construction on the environment and the temporary engineering cost are reduced.
On the other hand, the invention selects a site suitable for prefabricating the pipe joint in the water area near the tunnel site, ensures that the negative buoyancy value of the pipe joint meets the characteristic value of the bearing capacity of the prefabricated site foundation through accurate anti-floating calculation, reduces the requirement of the pipe joint on the bearing capacity of the prefabricated site foundation and the foundation pretreatment cost, and reduces the pressure of the pipe joint on the air bag. And hauling the open type pipe joint structure to a prefabricated site, sitting on the inflated air bag structure, and casting a pipe joint top plate and the rest pipe joint side wall part for the second prefabrication. In the whole pouring process, the open type pipe joint structure is located on the inflatable air bag, so that the stability, the safety and the measurement precision of the reinforced concrete pipe joint in the pouring process are effectively ensured; meanwhile, the problem that the pipe joint is sucked at the bottom is effectively avoided, and the practicability of the engineering is greatly improved.
In addition, it should be noted that the specific embodiments described in the present specification may differ in the shape of the components, the names of the components, and the like. All equivalent or simple changes of the structure, the characteristics and the principle of the invention which are described in the patent conception of the invention are included in the protection scope of the patent of the invention. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (3)
1. A method for prefabricating immersed tube sections in batches capable of reducing the scale of dry docks is characterized by comprising the following steps:
s1, building a small temporary dry dock near the tunnel;
s2, pouring an open type pipe joint structure in the small temporary dry dock of the step S1, wherein the open type pipe joint structure comprises a pipe joint bottom plate, partial pipe joint side walls, a pipe joint middle partition wall and sealing doors arranged at two ends of the pipe joint;
s3, injecting water into the dry dock to enable the open type pipe joint structure to float in the dry dock;
s4, selecting a prefabricated site in a water area near the tunnel site, and leveling the foundation of the prefabricated site; sinking a plurality of uninflated air bags in the leveled underwater prefabricated site, anchoring the air bags at the river bottom, and inflating the air bags after anchoring;
s5, hauling the floating open type pipe joint structure in the step S3 to the underwater prefabricated site in the step S4, sinking the pipe joint structure to the inflated air bag structure, and anchoring the open type pipe joint structure through mooring lines;
s6, casting a pipe joint top plate and the rest pipe joint side wall part on the open type pipe joint structure to finish the integral prefabrication of the immersed tube pipe joint;
s7, uniformly releasing the air in the air bag, and floating the immersed tube joint in water;
and S8, dragging the prefabricated immersed tube pipe joint to a tunnel site immersed water area for immersion and butt joint.
2. The method of claim 1, wherein in step S1, the land area and the dock floor elevation of the temporary dry dock are calculated by anti-floating according to the size and weight of the open type pipe joint structure in step S2, and the undocking water level.
3. The method of prefabricating a sinking pipe section in batches for reducing the scale of dry dock according to claim 1, wherein in step S4, the air bag is connected with an anchor block by a cable, and the anchor block is fixed with the foundation of the prefabricating field; the air bags are arranged in sequence, and the arrangement distance between the air bags is required to meet the requirement that the air bags can be contacted with each other after being inflated.
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| CN202110946504.2A CN113638446B (en) | 2021-08-18 | 2021-08-18 | Immersed tube segment batch prefabricating method capable of reducing scale of dry dock |
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| CN202110946504.2A CN113638446B (en) | 2021-08-18 | 2021-08-18 | Immersed tube segment batch prefabricating method capable of reducing scale of dry dock |
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| CN113638446B CN113638446B (en) | 2022-09-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114164862A (en) * | 2022-02-11 | 2022-03-11 | 中铁第六勘察设计院集团有限公司 | Immersed tube tunnel rapid construction method based on flat ground pipe joint prefabrication |
| CN114837226A (en) * | 2022-05-06 | 2022-08-02 | 中铁第六勘察设计院集团有限公司 | Dry dock arrangement method based on immersed tunnel passing through Jiangxian continents |
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2021
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Cited By (2)
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| CN114837226A (en) * | 2022-05-06 | 2022-08-02 | 中铁第六勘察设计院集团有限公司 | Dry dock arrangement method based on immersed tunnel passing through Jiangxian continents |
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| CN113638446B (en) | 2022-09-06 |
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