A jacket structure for a shallow cover

Abstract

The utility model relates to a kind of jacket structure for shallow overburden layer.It is applicable to offshore platform technical field.The utility model uses the technical scheme that a kind of jacket structure for shallow overburden layer has: jacket main body, it is arranged on overburden layer, and it is composed of guide pipe pile and guide pipe beam connected between guide pipe pile;Steel pipe pile is arranged in guide pipe pile, and the lower end of steel pipe pile is inserted into overburden layer;Anchor rod structure is arranged in steel pipe pile, and the lower end of anchor rod structure is inserted into rock layer below overburden layer.Such, tubular rod body is deeply into rock layer, and it is connected by high-strength concrete grouting between tubular rod body and rock layer, can use smaller diameter tubular rod body, smaller diameter borehole, realize very big anti-pulling bearing capacity, solve the problem of insufficient anti-pulling bearing capacity of pile.Because anchor rod structure is much smaller than the diameter of pile, so its borehole is simple and fast, and the diameter of anchor rod is small, and the amount of material is saved, so anchor rod structure construction is fast and low in cost.

Description

Technical Field

[0001] This utility model relates to a jacket structure for shallow overlay layers. It is applicable to the field of offshore platform technology. Background Technology

[0002] In addition to vertical forces, offshore electrical platforms also bear significant horizontal forces due to wind, waves, and earthquakes. These horizontal forces require the base of the jacket foundation to withstand substantial compressive and tensile stresses. For offshore electrical platforms with shallow overburden, the thin overburden layer and shallow pile penetration depth often result in insufficient compressive and tensile bearing capacity. Traditional techniques for addressing the compressive and tensile bearing capacity issues of jacket structures for offshore electrical platforms with shallow overburden involve using embedded rock piles or shallow pile jackets.

[0003] Rock-socketed piles are constructed by drilling holes within the rock strata and inserting the piles into the rock mass, with the piles connected to the rock mass by concrete grouting. However, rock-socketed piles generally have a large diameter, requiring large borehole diameters, resulting in a large workload and long drilling time, thus increasing their cost. Shallow pile jackets involve driving piles into the upper surface of the rock strata. While the piles have sufficient compressive bearing capacity, their tensile bearing capacity is low. Therefore, measures such as increasing the root opening of the jacket to reduce pile pull-out force and increasing pull-out force through ballast loading are used to address the pull-out problem. However, these measures can only solve a limited amount of pull-out force. For situations with high pull-out force, shallow pile jackets require a large root opening and a large amount of ballast, resulting in a higher overall cost. Utility Model Content

[0004] The technical problem to be solved by this utility model is: to solve the above-mentioned technical problem, this utility model provides a guide frame structure for shallow overlay.

[0005] The technical solution adopted in this utility model is: a catheter framework structure for shallow overlay layers, having: The main body of the jacket structure is located on the overburden layer and consists of jacket piles and jacket beams connecting the jacket piles. Steel pipe piles are arranged inside tremie piles, with the lower end of the steel pipe piles extending into the overburden layer. An anchor structure is installed inside the steel pipe pile, with the lower end of the anchor structure extending into the rock strata below the overburden.

[0006] A borehole is drilled in the rock strata along the axis of the steel pipe pile. The anchor structure has a tubular rod extending into the borehole through the steel pipe pile and a concrete body filling the borehole. An anchor head structure is provided between the upper end of the steel pipe pile and the tubular rod.

[0007] A casing is arranged inside the steel pipe pile along the length of the steel pipe pile, and the casing is connected to the borehole.

[0008] Multiple guide rings are provided on the outer wall of the tubular rod along the length of the tubular rod.

[0009] An end bearing structure is provided at the end of the tubular rod that extends into the sleeve. The end bearing structure has an end bearing plate fixedly connected to the end of the tubular rod, and the end bearing plate is in the shape of a ring.

[0010] A guide cage is installed at the lower end of the end bearing plate. The guide cage is conical and has a steel mesh structure.

[0011] The anchor head structure has a pile head bearing plate installed on the inner wall of the steel pipe pile, and an anchor head bearing plate that can be mounted on the pile head bearing plate is fitted at the end of the tubular rod body. An anchor head pull plate is welded on the tubular rod body at the upper position of the anchor head bearing plate.

[0012] A corbel structure is fixedly installed at the lower end of the pile head bearing plate inside the steel pipe pile. The corbel structure has an annular plate fixedly installed on the inner wall of the steel pipe pile, and a rib plate is connected between the lower end of the annular plate and the inner wall of the steel pipe pile.

[0013] The guide piles of the main body of the guide frame are arranged at an angle, with the lower end of the guide pile tilting outward.

[0014] A construction method for a jacket structure, applied to the aforementioned jacket structure for shallow overlay: The main body of the guide frame is placed on the cover layer; The steel pipe piles are inserted into the guide piles of the guide frame body from top to bottom, so that the steel pipe piles are driven to the bottom of the overburden layer. Drill holes along the length of the steel pipe pile into the rock strata at the bottom of the steel pipe pile using a down-the-hole drill; A casing is laid inside the steel pipe pile along the length of the steel pipe pile, and the casing is connected to the borehole. The tubular rod is inserted from the top of the casing into the casing and eventually extends to the bottom of the borehole; Concrete is poured into the borehole through a tubular rod, with the concrete being poured from the bottom of the hole upwards until it reaches the upper surface of the rock strata. After the poured concrete reaches the design strength, the tubular rod is tensioned. Once the tension is set, the anchor head structure at the end of the tubular rod is locked by welding the anchor head plate to the tubular rod.

[0015] The beneficial effects of this utility model are as follows: By setting steel pipe piles that can be anchored into the overburden layer within the guide piles of the guide frame body, and setting anchor rod structures that can be anchored into the rock strata within the steel pipe piles, and connecting the steel pipe piles and anchor rod structures through anchor head structures, this utility model enables the guide frame structure to have high structural strength. The tubular rods penetrate deep into the rock strata and are connected to the rock strata through high-strength concrete grouting. This allows for the achievement of high tensile strength using smaller diameter tubular rods and smaller diameter boreholes, solving the problem of insufficient tensile strength of piles. Because the diameter of the anchor rod structure is much smaller than that of the pile, drilling is simple and quick. The small diameter of the anchor rod also saves material, resulting in fast and low-cost construction of the anchor rod structure.

[0016] This invention utilizes a prestressed anchor head structure installed between the top of the tubular rod of the anchor structure and the steel pipe pile to ensure the tubular rod is always under tension. Because the tubular rod has a small diameter but a large length, its compressive strength is weak, but its tensile strength is strong. Furthermore, during operation, the guide pipe pile of the guide frame may be under both compression and tension. Under compression, the entire pile leg deforms downwards. Without prestress, the end bearing plate of the anchor structure may detach from the grouting concrete. Under tension, it tightens, but concrete has a weak tensile capacity; this tension-compression cycle may cause local fatigue failure of the grouting concrete near the end bearing plate, resulting in the end bearing plate not being fully tightened. Therefore, applying prestress to the rod ensures that the end bearing plate is always under tension and the grouting concrete is always under compression, thus ensuring the tensile stability of the anchor system.

[0017] This invention provides an end bearing plate at the bottom of the tubular rod. When the anchor structure is under tension or compression, the end bearing plate can withstand greater tension or compression, thereby enhancing the connection strength between the tubular rod and the concrete.

[0018] This invention achieves high structural strength and stability by arranging the guide piles of the guide frame body at an angle, with the lower end of the guide piles tilting outwards. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the guide frame structure in this utility model.

[0020] Figure 2 This is a schematic diagram of the anchor bolt structure in this utility model.

[0021] Figure 3 This is a schematic diagram of the fit between the tubular rod and the sleeve in this utility model.

[0022] Figure 4 This is a schematic diagram of the anchor head structure in this utility model.

[0023] In the diagram: 1. Pipe pile; 2. Steel pipe pile; 3. Anchor structure; 31. Tubular rod; 32. Sleeve; 33. Concrete body; 34. End bearing structure; 35. Anchor head structure; 36. Guide ring; 341. End bearing plate; 342. Guide cage; 343. Grout outlet; 351. Rib plate; 352. Pile head bearing plate; 353. Anchor head bearing plate; 354. Anchor head tie plate. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0025] Example 1 is a duct stent structure for shallow overlays. In this example, it has: The main body of the jacket structure is arranged on the cover layer and consists of jacket pile 1 and jacket beams connecting the jacket pile 1; Steel pipe pile 2 is arranged inside the guide pipe pile 1, with the lower end of steel pipe pile 2 extending into the overburden layer; Anchor structure 3 is installed inside steel pipe pile 2, with its lower end extending into the rock stratum beneath the overburden. In this way, the tubular rod 31 penetrates deep into the rock stratum and is connected to it via high-strength concrete grouting. This allows for the achievement of high tensile strength using a relatively small diameter tubular rod 31 and a small diameter borehole, thus solving the problem of insufficient tensile strength in piles. Because the diameter of anchor structure 3 is much smaller than that of the pile, drilling is simple and quick. The small diameter of the anchor rod also reduces material consumption, resulting in fast and low-cost construction of anchor structure 3.

[0026] In this embodiment, the guide piles 1 of the main body of the jacket structure are arranged at an angle, with the lower end of the guide piles 1 tilting outward. This gives the jacket structure high structural strength and stability.

[0027] Example 2 is a guide frame structure for shallow overburden layers. Based on Example 1, in this example, boreholes are drilled in the rock strata along the axis of the steel pipe pile 2. The anchor structure 3 has a tubular rod 31 extending into the borehole through the steel pipe pile 2 and a concrete body 33 filling the borehole. An anchor head structure 35 is provided between the upper end of the steel pipe pile 2 and the tubular rod 31. Thus, after the tubular rod 31 is placed in the borehole, high-strength concrete is poured into the borehole. When the concrete body 33 solidifies, the tubular rod 31, the concrete body 33, and the rock strata are bonded together, resulting in high structural strength. The anchor head structure 35 between the top of the tubular rod 31 and the steel pipe pile 2 enhances the connection strength between the anchor structure 3 and the steel pipe pile 2, and also facilitates the application of prestress to the tubular rod 31, giving it better compressive strength. The hollow structure of the tubular rod 31 can serve as a grouting channel, eliminating the need to install grouting pipes during grouting and saving the installation process.

[0028] In this embodiment, a sleeve 32 is arranged inside the steel pipe pile 2 along the length of the steel pipe pile 2, and the sleeve 32 is connected to the borehole. In this way, the sleeve 32 can play a guiding role when the tubular rod 31 is about to be inserted into the borehole.

[0029] Furthermore, multiple guide rings 36 are provided on the outer wall of the tubular rod 31 along its length. The guide rings 36 cooperate with the inner wall of the sleeve 32, allowing the tubular rod 31 to be arranged along the axis of the sleeve 32 and the drilled hole during installation. The guide rings 36 are made of bent steel bars welded to the rod body, and are spaced apart along the anchor rod.

[0030] In this embodiment, an end bearing structure 34 is provided at the end of the tubular rod 31 that extends into the sleeve 32. The end bearing structure 34 has an end bearing plate 341 fixedly connected to the end of the tubular rod 31, and the end bearing plate 341 is annular. Thus, after the tubular rod 31 is arranged in the borehole and concrete grout is injected into the borehole, the cooperation between the end bearing plate 341 and the concrete body 33 can enhance the tensile and compressive strength of this anchor structure 3.

[0031] Furthermore, a guide cage 342 is installed at the lower end of the end bearing plate 341. The guide cage 342 is conical and has a steel mesh structure. This effectively prevents mud and sand from entering and clogging the slurry outlet 343 at the lower end of the tubular rod 31 when it is lowered.

[0032] Example 3 is a guide frame structure for shallow overburden layers. Based on Example 2, the anchor head structure 35 has a pile head bearing plate 352 installed on the inner wall of the steel pipe pile 2, and an anchor head bearing plate 353 that can be mounted on the pile head bearing plate 352 is fitted at the end of the tubular rod 31. An anchor head tie plate 354 is welded to the tubular rod 31 at the upper position of the anchor head bearing plate 353. Thus, after the concrete 33 poured into the borehole has solidified, the anchor head tie plate 354 is welded to the tubular rod 31 after prestressing is applied, giving the anchor structure 3 a strong compressive strength.

[0033] In this embodiment, a corbel structure is fixedly installed at the lower end of the pile head bearing plate 352 inside the steel pipe pile 2. The corbel structure has an annular plate fixedly installed on the inner wall of the steel pipe pile 2, and a rib plate 351 is connected between the lower end of the annular plate and the inner wall of the steel pipe pile 2. In this way, the anchor head structure 35 between the tubular rod body 31 and the steel pipe pile 2 has high structural strength.

[0034] Example 4 is a duct stent structure for shallow overlays. In this example, it has: The main body of the jacket structure is arranged on the cover layer and consists of jacket pile 1 and jacket beams connecting the jacket pile 1; Steel pipe pile 2 is arranged inside the guide pipe pile 1, with the lower end of steel pipe pile 2 extending into the overburden layer; Anchor structure 3 is arranged inside steel pipe pile 2, and the lower end of anchor structure 3 extends into the rock stratum below the overburden.

[0035] A borehole is drilled in the rock strata along the axis of the steel pipe pile 2. The anchor structure 3 has a tubular rod 31 that extends into the borehole through the steel pipe pile 2 and a concrete body 33 that fills the borehole. An anchor head structure 35 is provided between the upper end of the steel pipe pile 2 and the tubular rod 31.

[0036] A casing 32 is arranged inside the steel pipe pile 2 along the length of the steel pipe pile 2, and the casing 32 is connected to the borehole.

[0037] Multiple guide rings 36 are provided on the outer wall of the tubular rod 31 along the length of the tubular rod 31.

[0038] An end bearing structure 34 is provided at the end of the tubular rod 31 that extends into the sleeve 32. The end bearing structure 34 has an end bearing plate 341 fixedly connected to the end of the tubular rod 31, and the end bearing plate 341 is annular.

[0039] A guide cage 342 is installed at the lower end of the end bearing plate 341. The guide cage 342 is conical and has a steel mesh structure.

[0040] The anchor head structure 35 has a pile head bearing plate 352 installed on the inner wall of the steel pipe pile 2, and an anchor head bearing plate 353 that can be mounted on the pile head bearing plate 352 is fitted at the end of the tubular rod 31. An anchor head pull plate 354 is welded on the tubular rod 31 at the upper position of the anchor head bearing plate 353.

[0041] A corbel structure is fixedly installed at the lower end of the pile head bearing plate 352 inside the steel pipe pile 2. The corbel structure has an annular plate fixedly installed on the inner wall of the steel pipe pile 2, and a rib plate 351 is connected between the lower end of the annular plate and the inner wall of the steel pipe pile 2.

[0042] The guide pile 1 of the main body of the guide frame is arranged at an angle, with the lower end of the guide pile 1 tilting outward.

[0043] In this embodiment, the construction method of the jacket structure is as follows: The main body of the guide frame is placed on the cover layer; The steel pipe pile 2 is inserted into the guide pile 1 of the guide frame body from top to bottom, so that the steel pipe pile 2 is driven to the bottom of the overburden layer. Drill a hole along the length of the steel pipe pile 2 into the rock stratum at the bottom of the steel pipe pile 2 using a down-the-hole drill; A sleeve 32 is laid inside the steel pipe pile 2 along the length of the steel pipe pile 2, and the sleeve 32 is connected to the borehole; The tubular rod 31 is inserted from the top of the casing 32 into the casing 32 and eventually extends to the bottom of the borehole; Concrete is poured into the borehole through the tubular rod 31, and the concrete is poured from the bottom of the hole upwards until it reaches the upper surface of the rock stratum. After the poured concrete reaches the design strength, the tubular rod 31 is tensioned. After tensioning to the set tension, the anchor head structure 35 at the end of the tubular rod 31 is locked by welding the anchor head plate 354 to the tubular rod 31.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A duct stent structure for shallow overlay, characterized in that: have: The main body of the jacket is arranged on the cover layer and consists of the jacket piles (1) and the jacket beams connecting the jacket piles (1); Steel pipe piles (2) are arranged inside the guide pipe piles (1), with the lower end of the steel pipe piles (2) extending into the overburden layer; Anchor structure (3) is arranged inside steel pipe pile (2), with the lower end of anchor structure (3) extending into the rock layer below the overburden.

2. The duct framework structure for shallow overlay as described in claim 1, characterized in that: A borehole is made in the rock stratum along the axis of the steel pipe pile (2). The anchor structure (3) has a tubular rod (31) that extends into the borehole through the steel pipe pile (2) and a concrete body (33) that fills the borehole. An anchor head structure (35) is provided between the upper end of the steel pipe pile (2) and the tubular rod (31).

3. A duct support structure for shallow overlays according to claim 2, characterized in that: A casing (32) is arranged inside the steel pipe pile (2) along the length of the steel pipe pile (2), and the casing (32) is connected to the borehole.

4. A duct support structure for shallow overlays according to claim 3, characterized in that: Multiple guide rings (36) are provided on the outer wall of the tubular rod (31) along the length of the tubular rod (31).

5. A duct support structure for shallow overlays according to claim 2, characterized in that: An end bearing structure (34) is provided at the end of the tubular rod (31) that extends into the sleeve (32). The end bearing structure (34) has an end bearing plate (341) fixedly connected to the end of the tubular rod (31), and the end bearing plate (341) is annular.

6. A duct framework structure for shallow overlays according to claim 5, characterized in that: A guide cage (342) is installed at the lower end of the end bearing plate (341). The guide cage (342) is conical and has a steel mesh structure.

7. A duct framework structure for shallow overlays according to claim 2, characterized in that: The anchor head structure (35) has a pile head bearing plate (352) installed on the inner wall of the steel pipe pile (2), and an anchor head bearing plate (353) that can be mounted on the pile head bearing plate (352) is fitted at the end of the tubular rod (31). An anchor head pull plate (354) is welded on the tubular rod (31) at the upper position of the anchor head bearing plate (353).

8. A duct framework structure for shallow overlays according to claim 7, characterized in that: A corbel structure is fixedly installed at the lower end of the pile head bearing plate (352) inside the steel pipe pile (2). The corbel structure has an annular plate fixedly installed on the inner wall of the steel pipe pile (2). A rib plate (351) is connected between the lower end of the annular plate and the inner wall of the steel pipe pile (2).

9. A duct stent structure for shallow overlay as described in claim 1, characterized in that: The guide piles (1) of the main body of the guide frame are arranged at an angle, with the lower end of the guide piles (1) tilting outward.

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