Method for building island in sea rock foundation

Abstract

The application discloses a method for rapidly building an island in a sea rock foundation, which comprises the following steps: prefabricating a caisson on land, throwing and filling caisson bed block stones, installing the caisson, filling stones in the caisson, raising the caisson bottom bed slurry, locking and closing the caisson, forming a water stop structure system, and finally, blowing and filling the land in the artificial island formed by the caisson to form a structure for sea reclamation and island building. The method for rapidly building an island has high operability and safety, does not need to excavate a foundation, adopts a caisson enclosure structure, reduces the sea area occupation, saves the environment, guarantees the quality, and has high construction efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of island construction, in particular to a method for constructing an island in a marine rock foundation. BACKGROUND

[0002] Reducing the occupation and destruction of marine resources is the direction of future development of the water conservancy industry, and the use of conventional methods to backfill the slope dike cofferdam and then blow-fill the island method not only takes a long time to construct, uses a large amount of fill, occupies a large area of the sea, and the silt during backfilling will pollute the marine environment, and as the filling depth of the slope dike cofferdam increases, the construction cost and construction difficulty increase significantly; other plug-in cofferdam structures such as steel cylinders and steel sheet piles are difficult to apply in rock foundation environments, therefore, a fast island construction method suitable for rock foundation conditions is needed. SUMMARY

[0003] The present application provides a method for constructing an island in a marine rock foundation.

[0004] The technical scheme adopted by the present application is as follows:

[0005] A method for constructing an island in a marine rock foundation, the construction steps of which are as follows:

[0006] S1. Rock foundation trench cleaning construction:

[0007] According to the island construction location, shape and range, the bottom surface of the caisson island structure is cleaned to remove the bottom surface silt and debris, and to ensure the hard bottom surface of the foundation;

[0008] S2. Onshore caisson prefabrication construction:

[0009] According to the different distribution positions of the caisson, different specifications of caisson are prefabricated onshore, four lock joints are pre-buried on both sides of the caisson, two lock joints on each side, lock joint pre-buried parts are arranged at the lock joints, long L-shaped steel plates are welded on the lock joint pre-buried parts, and Omega water stop belts are installed on the L-shaped steel plates; a slurry lifting pipe is pre-buried at the bottom of the caisson outside the sea, and the slurry lifting pipe directly reaches the top;

[0010] S3. Bedrock riprap construction:

[0011] According to the construction sequence, the bedrock riprap and leveling are gradually carried out, after the leveling is completed, the riprap bedrock is formed, and the geotextile is laid from the middle to the outside slope surface of the caisson installation position;

[0012] S4. Caisson installation:

[0013] According to the overall installation requirements of the caissons, they were transported from land to sea one by one for installation. At the same time as the caissons were installed, steel inserts were inserted at the locking positions of two adjacent caissons and sank synchronously with the caissons to be inserted into the bottom of the riprap foundation. After the caissons were installed, stones were filled into the caissons, and the grouting pipes were protected during the process.

[0014] S5. Bottom grouting of caisson:

[0015] After the stones are filled into the caisson, a geological drill is installed to drill through the bottom of the caisson through the grouting pipe, and a casing is installed to pass through the rubble bed and penetrate into the rock foundation. Then, cement grout is injected from low to high, and the casing is lifted at the same time. Finally, all gaps between the stones and the rubble bed and the bottom of the caisson are filled to form a water-stopping structure.

[0016] S6. Backfill the gaps between the locks of the caisson:

[0017] After the caissons are grouted, the gaps between the caissons are backfilled with plastic concrete and clay materials to protect the formed water-stop structure and create a stable water-stop structure system between the caissons.

[0018] S7. Internal filling of the artificial island:

[0019] After the artificial island structure of a certain scale and scope is formed, the reclamation construction is carried out to form a land reclamation structure.

[0020] In step S, pre-embedded locking devices are installed on both sides of the caisson sidewall. The locking device positions at the corners of the caisson are different from those at other locations.

[0021] In step S, the grouting pipes are steel sleeves, and the grouting pipes are evenly distributed on the bottom plate of the caisson, but do not penetrate the bottom plate.

[0022] The aforementioned sleeve is installed on the partition wall of the caisson.

[0023] The geotextile laid on the surface of the riprap foundation helps to confine the slurry, creating a relatively closed environment.

[0024] In step S, after the artificial island has reached a certain size, a portion of the caissons are reserved for temporary non-installation to facilitate the artificial island reclamation and seawater silt settling. After the reclamation affects the seawater quality, the last portion of the caissons is installed. After the caissons are installed, further reclamation is carried out. Meanwhile, after the seawater settles, a water pump is used to drain the seawater from inside the artificial island.

[0025] The quick island building method has high operability and safety, does not need to excavate a foundation, adopts a caisson to form a vertical caisson cofferdam structure, reduces the sea area occupation, saves the marine space, reduces the pollution to the marine environment, has no sludge overflow, can quickly form an island, has guaranteed quality, and has good water stop and structural stability, and the overall construction cost and difficulty are controllable. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a plane schematic view of the offshore artificial island of the present application.

[0027] Figure 2 FIG. 3 is a sectional view of the caisson structure of the present application.

[0028] Figure 3 FIG. 4 is a lock joint pattern of the caisson of the present application.

[0029] In the figure, 1 is a riprap foundation bed, 2 is a geotextile, 3 is a caisson, 4 is a grouting pipe, 5 is a sleeve pipe, 6 is a slurry, 7 is a steel insert plate, 8 is a lock joint embedded part, 9 is an L-shaped steel plate, 10 is a backfill material, 11 is a reclamation structure, and 12 is an omega water stop belt. DETAILED DESCRIPTION

[0030] Example 1

[0031] The construction condition of the quick island building on the rocky foundation in the sea is as follows: the cofferdam base on the north bank is below -12 m, the caisson 3 structure bottom elevation is -10.0 m, the caisson 3 is 20.0 m long, 14.0 m wide, and 14.0 m high, and there are 12 compartments, the outer partition wall of the compartment is 50 cm thick, the inner partition wall is 30 cm thick, three grouting pipes 4 are embedded at the caisson bottom, and seven grouting pipes 4 are embedded at the corners, and the concrete strength is C50F350 high-performance concrete.

[0032] The construction quality requirement is as follows: the caisson 3 prefabricated grouting pipe 4 is embedded, the size and perpendicularity of the lock joint embedded part 8 meet the requirements, the perpendicularity and gap of the installed omega water stop belt 12 meet the requirements, the surface flatness of the riprap foundation bed 1 and the geotextile 2 laying meet the requirements, the steel insert plate 7 is inserted together with the caisson 3 installation, after the caisson 3 is installed, the bed grouting is performed along the sleeve pipe 5 from low to high to fill the gaps between the stones with the cement slurry 6, the caisson lock joint position is backfilled, the backfill material 10 is plastic concrete and clay, and the backfill material fills and compacts the caisson 3 interlock joint gap.

[0033] A method for building an island quickly on a rocky foundation in the sea, and the construction steps are as follows:

[0034] S1. Rock foundation groove cleaning construction:

[0035] Based on the location, shape and scope of the island construction, the bottom surface of the caisson 3 island construction structure was cleaned to remove floating mud and debris, ensuring a hard bottom surface for the foundation.

[0036] S2. Onshore caisson prefabrication construction:

[0037] According to the different distribution locations of the caissons 3, caissons 3 of different specifications are prefabricated on land. Four lock slots are pre-embedded on the two side walls of the caisson 3, two lock slots on each side. Lock slot embedded parts 8 are set at the lock slots. A continuous L-shaped steel plate 9 is welded on the lock slot embedded parts 8. An Ω waterstop 12 is installed on the L-shaped steel plate 9. A grouting pipe 4 is pre-embedded at the bottom of the sea side of the caisson 3, and the grouting pipe 4 goes directly to the top.

[0038] S3. Subgrade riprap construction:

[0039] According to the construction sequence, the foundation bed is gradually filled with rubble and leveled. After the leveling is completed, the rubble foundation bed 1 is formed. Geotextile 2 is laid from the middle of the installation position of the caisson 3 to the outer sea side slope. The overlap length of geotextile 2 is 1m. When the rubble foundation bed 1 is filled with grout, the geotextile 2 will restrain the grout 6, forming a relatively closed environment to ensure the grouting effect.

[0040] S4. Caisson Installation:

[0041] According to the overall installation requirements of caisson 3, they are transported one by one from land to sea for installation. During installation, the spacing between adjacent caisson 3 lock joints is maintained, ensuring that steel insert plates 7 can be steadily inserted into the lock joints and sink synchronously with the caisson 3, inserting into the bottom of the riprap foundation 1. Four Ω-shaped waterstops 12 are installed at the positions of the steel insert plates 7. The steel insert plates 7 and the Ω-shaped waterstops 12 arranged on both sides ensure both a stable structure and a waterstop system. After the caisson 3 is installed, stones are filled inside, and the grouting pipe 4 is protected during the process. The cross-sectional structure of the caisson 3 is as follows. Figure 2 As shown, the detailed drawing of the lock openings of the three compartments of the caisson is as follows: Figure 3 As shown;

[0042] S5. Bottom grouting of caisson:

[0043] After the stones are filled into the box, a geological drill is installed to drill through the bottom of the caisson 3 from the grouting pipe 4, and a casing 5 is installed to pass through the rubble bed 1 and penetrate 0.5m into the rock foundation. Then, cement grout is injected from low to high, and the casing 5 is lifted at the same time. Finally, all gaps between the stone and the rubble bed 1 and the bottom of the caisson 3 are filled to form a water-stopping structure.

[0044] S6. Backfill the gaps between the locks of the caisson:

[0045] After the caisson 3 is grouted, the gap between the caissons 3 is backfilled with plastic concrete, clay and other materials to protect the formed water stop structure and form a stable water stop structure system between the caissons 3;

[0046] S7. Reclamation inside the artificial island:

[0047] After the artificial island structure of a certain scale and range is formed, a part of the caissons 3 is temporarily not installed, facilitating reclamation and seawater sedimentation, reclamation is carried out, the last part of the caissons 3 is installed after the seawater quality is affected by reclamation, and after the seawater is deposited, the seawater inside the artificial island is pumped out to form a reclamation structure 11.

[0048] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0049] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0050] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] The above detailed description of the embodiments of the present application is only preferred embodiments of the present application, and should not be considered as limiting the scope of the present application. Any equivalent changes and improvements made according to the scope of the present application should still belong to the patent coverage of the present application.

Claims

1. A method for rapid island construction on marine rocky foundations, characterized in that, The construction steps are as follows: S1. Construction of rock foundation trench cleaning: According to the location, shape and scope of the island construction, the bottom surface of the caisson (3) island construction structure is cleaned to remove floating mud and debris to ensure a hard bottom surface of the foundation; S2. Onshore caisson prefabrication construction: According to the different distribution locations of the caissons (3), caissons (3) of different specifications are prefabricated on land. Four lock slots are pre-embedded on both sides of the caisson (3), two lock slots on each side. Lock slot pre-embedded parts (8) are set at the lock slots. A continuous L-shaped steel plate (9) is welded on the lock slot pre-embedded parts (8). An Ω waterstop (12) is installed on the L-shaped steel plate (9). A grouting pipe (4) is pre-embedded at the bottom of the sea side of the caisson (3). The grouting pipe (4) extends directly to the top. S3. Subgrade riprap construction: According to the construction sequence, the foundation bed is gradually filled with riprap and leveled. After the leveling is completed, a riprap foundation bed (1) is formed. Geotextile (2) is laid from the middle of the caisson (3) installation position to the outer sea side slope. S4. Caisson Installation: According to the overall installation requirements of the caissons (3), they are transported from land to sea one by one for installation. While the caissons (3) are being installed, steel insert plates (7) are inserted into the locking positions of two adjacent caissons (3) and sink synchronously with the caissons (3) and are inserted into the bottom of the riprap bed (1). After the caissons (3) are installed, stones are filled into the caissons. During the process, the grouting pipes (4) are protected. S5. Bottom grouting of caisson: After the stones are filled into the box, a geological drill is set up to drill through the bottom of the caisson (3) from the grouting pipe (4), and a casing (5) is set up to pass through the rubble bed (1) and go deep into the rock foundation. Then, cement grout is injected from low to high (6), and the casing (5) is raised at the same time. Finally, all gaps between the stone and the rubble bed (1) and the bottom of the caisson (3) are filled to form a water-stopping structure. S6. Backfill the gaps between the locks of the caisson: After the grouting of the caisson (3) is completed, the gap between the caissons (3) is backfilled. The backfill material (10) is plastic concrete and clay material, which protects the water-stop structure that has been formed and forms a stable water-stop structure system between the caissons (3). S7. Internal filling of the artificial island: After the artificial island structure of a certain scale and scope is formed, the dredging construction is carried out to form a land reclamation structure (11).

2. The method for rapid island construction on marine rocky foundations according to claim 1, characterized in that, In step S2, pre-embedded lock slots (8) are pre-embedded on both sides of the side wall of the caisson (3). The lock slots at the corners of the caisson (3) and other locations are different.

3. The method for rapid island construction on marine rocky foundations according to claim 2, characterized in that, In step S2, the grouting pipe (4) is a steel sleeve. The grouting pipe (4) is evenly distributed on the bottom plate of the caisson (3), but does not penetrate the bottom plate.

4. The method for rapid island construction on marine rocky foundations according to claim 3, characterized in that, The sleeve (5) is installed on the partition wall of the caisson (3).

5. The method for rapid island construction on marine rocky foundations according to claim 4, characterized in that, The geotextile (2) laid on the surface of the rubble bed (1) constrains the slurry (6), forming a relatively closed environment.

6. The method for rapid island construction on marine rocky foundations according to claim 5, characterized in that, In step S7, after the artificial island has reached a certain size, a portion of the caissons (3) are reserved and not installed temporarily to facilitate the artificial island's reclamation and seawater siltation. After the reclamation affects the seawater quality, the last portion of the caissons (3) is installed. After the caissons (3) are installed, the reclamation is supplemented. At the same time, after the seawater settles, a water pump is used to discharge the seawater inside the artificial island.

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