CN113006144B

CN113006144B - Permeable structure tunnel structure

Info

Publication number: CN113006144B
Application number: CN202110208690.XA
Authority: CN
Inventors: 李奕男; 刁进东; 薛宇安
Original assignee: Dalian Municipal Design & Research Institute Co ltd; CCCC First Harbor Engineering Co Ltd
Current assignee: Dalian Municipal Design & Research Institute Co ltd; CCCC First Harbor Engineering Co Ltd
Priority date: 2021-02-24
Filing date: 2021-02-24
Publication date: 2022-09-02
Anticipated expiration: 2041-02-24
Also published as: CN113006144A

Abstract

The invention provides a permeable structure tunnel structure. The marine mid-sea tunnel comprises a main structure of a marine mid-sea tunnel and protective caisson water stopping structures connected to two sides of the marine mid-sea tunnel, wherein the main structure of the marine mid-sea tunnel comprises a traffic lane box hole, a ballast bin box hole and a pipeline bin box hole, a foundation of the main structure of the marine mid-sea tunnel adopts a bored pile, the protective caisson water stopping structure consists of a temporary protective caisson and a permanent protective caisson, and a blocking box structure is arranged between the permanent protective caisson and the main structure of the marine mid-sea tunnel after the temporary protective caisson is removed at the end of a construction period. The permeable structure tunnel structure provided by the invention is provided with the permeable structure and is periodically desilted and dredged, so that the stability of the ecological environment of a tunnel site area can be reliably ensured, the harmony and win-win of environmental protection and municipal infrastructure construction is realized, the design scheme of a novel permeable structure is created, the technical innovation with wide prospect is completed, and the damage of the existing open cut construction method to the ocean and land environment is reduced.

Description

Permeable structure tunnel structure

Technical Field

The invention relates to the technical field of submarine tunnel construction engineering, in particular to a permeable structure tunnel structure.

Background

Large-scale cross-sea tunnel engineering in engineering construction is increasing, and open excavation backfill type tunnels are one of the construction methods for constructing tunnels, because the construction method is to dig a tunnel downwards from the ground and backfill the road surface to obtain the name. The method is suitable for building the submarine tunnel, and can be used for building the submarine tunnel by matching with temporary sea filling.

At present, most offshore tunnel structures in China adopt a covering and backfilling mode, and coastal wetlands (comprising coastal beaches, estuaries, shallow seas, mangroves, coral reefs and the like) are important inhabitation and propagation places of offshore organisms and bird migration transfer stations, are precious wetland resources and have important ecological functions. In recent years, the coastal wetland protection work in China achieves certain effect, but the coastal wetland is constructed in large scale by sea engineering for a long time, open excavation and backfilling are carried out, the large area of the coastal wetland is reduced, the natural shoreline is sharply reduced, and the damage to the ocean and land ecosystem is caused. In order to actually improve the protection level of the coastal wetland, the unconfined sea-using activity should be strictly controlled, and the traditional method for constructing the tunnel by covering, backfilling is improved.

Disclosure of Invention

The invention provides a permeable structure tunnel structure in view of the fact that the construction method of an open-cut backfill type submarine tunnel has great influence on sea area environment and surrounding buildings. The invention has wide structure application range, is slightly influenced by surrounding environment and geological conditions, and can reduce the influence of the construction of the sea-filling tunnel on offshore in the prior art. The technical means adopted by the invention are as follows:

a permeable structure tunnel structure comprising: sea midrange tunnel major structure and connect the protection caisson stagnant water structure in its both sides, sea midrange tunnel major structure includes lane case hole, ballast bin case hole and pipeline storehouse case hole, the basis of sea midrange tunnel major structure adopts the bored concrete pile, protection caisson stagnant water structure comprises interim protection caisson and permanent protection caisson two parts, and after the construction period ended and demolishd interim protection caisson, set up shutoff box structure between permanent protection caisson and the sea midrange tunnel major structure.

Furthermore, in the construction period, a vertical dry-operation construction cofferdam is formed by using the caisson, and the cofferdam and the land water-stopping envelope structure form a closed structure, so that the dry-operation construction conditions of the part structure of the shore section sea area are met; after the construction of the shore section sea area part structure is cast in place, the temporary protection caissons are detached at intervals corresponding to the permeable positions of the tunnel to form a permeable structure, and the rest caissons are used as permanent protection structures of the shore section in the operation period.

Furthermore, the length of the plugging box body is 15 meters, the width of the plugging box body is 0.2 meter, the height of the plugging box body is parallel to the height of the permanent caisson, and C50 reinforced concrete is adopted for pouring.

Furthermore, a water-permeable channel is arranged at the bottom of the main structure of the tunnel between the protection caissons, the height of the channel is not less than 2.5m, 3 supporting sheet wall structures are arranged in the channel, and the pile diameter of the cast-in-place pile is 1 m.

Furthermore, a broken stone cushion layer and a block stone ballast layer are laid at the top of the main structure of the marine middle tunnel, and retaining walls higher than the laid layer are arranged at two ends of the main structure of the marine middle tunnel, which are close to the water stop structure of the protection caisson.

The invention has the following advantages: the permeable structure tunnel structure mainly comprises a protection caisson water stop structure, a plugging box body structure and a main structure of a tunnel in the middle sea section, and by arranging the permeable structure and regularly dredging and dredging, the stability of the ecological environment in a tunnel site area can be reliably ensured, the harmony and win-win of environmental protection and municipal infrastructure construction are realized, the design scheme of a novel permeable structure is created, the technical innovation with wide prospect is completed, and the damage of the existing open cut backfill construction method to the sea and land environment is reduced.

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 embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are 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 front view of the present invention.

FIG. 2 is a front view of the present invention during construction.

Fig. 3 is a side view of the present invention.

Fig. 4 is a top view of the present invention.

In the figure: 1. a permanent protection caisson; 2. blocking the box body; 3. a main structure of a middle-sea tunnel; 4. a small retaining wall at the top of the tunnel; 5. a roadway box hole; 6. pressing a box hole of the weight bin; 7. a pipe bin hole; 8. drilling a cast-in-place pile; 9. a concrete cushion; 10. a broken stone cushion layer and a block stone ballast layer; 11. a sheet wall structure; 12. a temporary protection caisson; 13. the permanent caisson is connected with the cover plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.

As shown in fig. 1 to 4, an embodiment of the present invention discloses a permeable structure tunnel structure, including: marine midrange tunnel major structure 3 and connect the protection caisson stagnant water structure in its both sides, marine midrange tunnel major structure includes travelway case hole 5, ballast bin case hole 6 and pipeline storehouse case hole 7, marine midrange tunnel major structure's basis adopts concrete cushion 9 drilling bored concrete pile 8 down, protection caisson stagnant water structure comprises interim protection caisson 12 and permanent protection caisson 1 two parts, and after the construction period ended and demolishd interim protection caisson, set up shutoff box 2 structure between permanent protection caisson and the marine midrange tunnel major structure. The major structure section is five hole rectangle box culvert structures of aequilate, and in this embodiment, the structure is horizontal wide 41.30 meters, and the clear width in both sides lane hole is 12.65m, and the clear width in both sides ballast box hole is 2.9m, and the clear width in middle box hole is 4.4 m.

In the construction period, a vertical dry operation construction cofferdam is formed by using the caisson, and the cofferdam and the land water-stop building enclosure form a closed structure, so that the dry construction operation condition of part of the structure of the land section and the sea area is met; after the construction of the shore section sea area part structure is finished by casting, the temporary protection caissons are detached at intervals corresponding to the permeable positions of the tunnel to form a permeable structure, and the rest caissons are used as permanent protection structures of the shore section in the operation period and are connected through the permanent caisson connecting cover plates 13, so that the transverse rigidity of the permeable tunnel is increased, the ship collision protection is provided, and a certain wave shielding effect is achieved. And cast-in-place plugging concrete is arranged between the protection caisson and the tunnel main body structure and serves as a force transmission structure, and the width of the cast-in-place plugging concrete is 2 m.

The length of the plugging box body is 15 meters, the width is 0.2 meter, the height is parallel to the permanent caisson, and C50 reinforced concrete is adopted for pouring.

The bottom of the main structure of the tunnel between the protection caissons is provided with a water permeable channel, the height of the channel is not less than 2.5m, 3 supporting sheet wall structures 11 are arranged in the channel, and the pile diameter of the cast-in-place pile is 1 m.

The shore-connecting tunnel is arranged under the sea midsection structure at intervals by using a wall structure to form transverse water permeable channels, the whole tunnel is a water permeable structure, and the structure is under the action of horizontal wave force and wave supporting force. The lane holes at two sides and the middle pipe gallery hole adopt a plain concrete pressure weight anti-floating measure. After the enclosure caisson structure is dismantled, the enclosure caisson structure is directly contacted with seawater, and the structure stress faces the action of horizontal wave force and wave supporting force. Meanwhile, the structure of the marine middle section is different from that of the immersed tube section, and the marine middle section is not protected by an all-directional locking covering layer, so that temperature cracks are easily generated on the part leaking out of the water surface due to severe day and night temperature difference changes, and the temperature stress caused by the temperature difference changes is reduced by arranging a plurality of layers of weight heat insulation layers in the small retaining wall at the top of the tunnel. Broken stone bedding course and piece stone ballast layer 10 are laid at the top of middle sea tunnel major structure, and the both ends that middle sea tunnel major structure is close to protection caisson stagnant water structure are equipped with the barricade 4 that highly is higher than the layer of laying. Because the marine structure has no gravel layer locking and general backfill protection, a gravel cushion layer, a stone ballast layer and a fence plate are filled in a closed area surrounded by a retaining wall arranged on the top of the structure side wall in a layered mode, and the temperature stress caused by temperature difference change can be effectively weakened.

Six rows are transversely arranged in the wall-slicing area, four rows are transversely arranged in the non-wall-slicing area and are arranged near the side wall and the middle wall, and the longitudinal distance is 4.5 meters. The structure in the range of the temporary caisson adopts a foundation type of a wall slab and a pile foundation (a water-permeable channel with the height not less than 2.5m is formed); the permanent caisson is of a high pile foundation type, the diameter of a pile foundation is 1.0 meter, and the pile foundation is embedded into the medium-stroke mineralized rock stratum and is not less than 2 meters.

The invention can reduce the influence of the construction of the sea-filling tunnel on offshore in the prior tunnel construction technology, realizes the harmony and win-win of environmental protection and municipal infrastructure construction, creates the design scheme of a novel permeable structure and completes the technical innovation with wide prospect.

The invention also discloses a construction method of the permeable structure tunnel structure, which comprises the following specific steps:

the bank section structure sets up the protection caisson during the construction, and protection caisson scheme structure mainly comprises the triplex: protection caisson structure, shutoff box structure and marine midrange tunnel major structure.

The protection caisson water stop structure consists of a temporary protection caisson and a permanent protection caisson, wherein the caisson is used for forming a vertical dry operation construction cofferdam in the construction period and is closed with the land water stop enclosure structure, so that the dry construction operation condition of the land section sea area partial structure is met. After the completion of the casting of the shore section sea area partial structure, the temporary protection caisson is detached at intervals corresponding to the permeable positions of the tunnels to form a permeable structure, and the rest caissons are used as a permanent protection structure of the north shore section in the operation period, so that the transverse rigidity of the permeable tunnels is increased, the ship collision protection is provided, and the shield caisson has a certain shielding effect on waves. And cast-in-place plugging concrete is arranged between the protection caisson and the tunnel main body structure and serves as a force transmission structure, and the width of the cast-in-place plugging concrete is 2 m.

The section of the main structure of the middle-sea section tunnel, of which the top is lower than the designed low water level, is used as the sea of the submarine tunnel, and the section higher than the designed low water level is designed according to a water permeable structure. The bottom of the main structure of the tunnel between the protection caissons is provided with a water permeable channel, the height of the channel is not less than 2.5m, and the channel is internally provided with 3 supporting sheet wall structures. The main structure of the tunnel adopts a cast-in-place pile foundation with the pile diameter of 1 meter.

Specifically, the first stage is a land area forming stage, a temporary cofferdam is formed by 51 caissons and waterproof curtains, the east section of the cofferdam is 319.6m long, and the west section of the cofferdam is 362.6m long. The caisson sealing water is combined with the rear land sealing enclosure to form closed sealing water. A caisson branch plugging structure and a rear protection structure. The number of the rear protection caissons is 46, wherein 25 permanent protection caissons, 21 temporary caissons and 5 plugging structure caissons are provided.

The width of the plugging structure is 17.6m, the top elevation is 5.5m, the bottom elevation is-16.6 m, and sand is backfilled in the bin. And excavating a foundation bed below the caisson to the medium weathered rock stratum and grouting the foundation bed and the curtain. The width of the secondary water stop cast-in-situ box body is 6.0 m.

The second stage is a thrust section structure construction stage, and meanwhile, a water stopping box body is cast in situ above the thrust section and is connected with caissons on two sides to form secondary water stopping of the bank section. And (4) removing the plugging caisson after the construction of the thrust section is finished, butting the E1 sections of the box body, and simultaneously continuing the construction of the structure of the northern bank section.

The total width of the section of the rear protective structure is 80.1m, the east-west caisson is symmetrically arranged, the width of the caisson is 16.3m, the top elevation is 5.5m, and the bottom elevation is-10.0 m to-14.7 m. The wave-blocking wall is of a concrete structure. A foundation bed below the caisson is excavated to the middle weathered rock and is used for grouting the foundation bed and curtain grouting, and the permanent caisson is used for grouting reinforcement on a row of cabin lattices at the outermost side in order to avoid unrepairable structural damage caused by ship impact.

And the third stage is a pouring stage for finishing other structural sections of the north-connected bank of the tunnel, and the temporary caisson and the secondary water-stop box body are removed at intervals to change the original cofferdam into a permeable structure. The permanent caissons are connected by hollow plates, and simultaneously the anti-collision piers and other structures are completed.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A permeable structure tunnel structure is characterized by comprising a marine middle section tunnel main body structure and protective caisson water stopping structures connected to two sides of the marine middle section tunnel main body structure, wherein the marine middle section tunnel main body structure comprises a traffic lane box hole, a ballast bin box hole and a pipeline bin box hole, a foundation of the marine middle section tunnel main body structure adopts a bored pile, the protective caisson water stopping structure consists of a temporary protective caisson and a permanent protective caisson, and a blocking box body structure is arranged between the permanent protective caisson and the marine middle section tunnel main body structure after the temporary protective caisson is removed at the end of a construction period;

in the construction period, a vertical dry operation construction cofferdam is formed by using the caisson, and the cofferdam and the land water-stopping envelope structure form a closed structure, so that the dry construction operation condition of the part structure of the shore section sea area is met; after the casting of the part of the structure of the shore section sea area is finished, the temporary protection caisson is detached at intervals corresponding to the permeable position of the tunnel to form a permeable structure, and the rest caisson serves as a permanent protection structure of the shore section in the operation period;

the bottom of a main structure of the tunnel between the protection caissons is provided with a water permeable channel, the height of the channel is not less than 2.5m, 3 supporting sheet wall structures are arranged in the channel, and the shore-connected tunnel is arranged at intervals under the middle-sea structure to form transverse water permeable channels.

2. The permeable structure tunnel structure of claim 1, wherein the plugging box bodies are 15 m long, 0.2 m wide and flush with the permanent caisson in height, and are cast of C50 reinforced concrete.

3. The permeable structure tunnel structure of claim 1, wherein a gravel cushion layer and a block ballast layer are laid on the top of the main structure of the marine midrange tunnel, and retaining walls higher than the laid layer are provided on both ends of the main structure of the marine midrange tunnel near the water stop structure of the protection caisson.