LNG tank integrated pile foundation structure

Abstract

The utility model provides an LNG tank integrated pile foundation structure which comprises a steel pipe protection wall, a concrete pile, a pile cap cushion layer, a pile cap steel protection wall, a positioning steel plate, a pile cap positioning steel ring and a connecting bolt. The steel pipe retaining wall enters a soil layer through a vibration impact construction method to form a pile hole, after the pile hole is cleaned, a reinforcement cage in the concrete pile is placed in the pile hole, and concrete is poured to form a pile foundation. And after the head of the reinforcement cage is exposed out of the ground, a pile cap cushion layer is poured, the pile cap steel protection wall is arranged on the pile cap cushion layer, and meanwhile steel bars in the reinforcement cage pass through holes of the positioning steel rings. And concrete in the pile cap steel protection wall is poured to form the pile cap. And the positioning steel plate is connected with the pile cap positioning steel ring through a connecting bolt. The prominent defects that a traditional concrete pile needs to break a pile cap and damage reinforcing steel bars in the pile are overcome, excavation of soil between piles, chiseling of the pile cap and the maintenance time of merging the pile and the pile cap are not needed, the construction efficiency is greatly improved, and the construction period is shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of new structures of liquefied natural gas tank pile foundations, and in particular relates to an integrated pile foundation structure for an LNG tank. Background Art

[0002] The foundation structure of liquefied natural gas (LNG) tanks usually adopts a pile foundation structure, with a large number of pile foundations and a relatively large construction volume. When the pile foundation is constructed above the ground, a new pile cap is often made by breaking the pile head, and the pile cap concrete needs to be chiseled off. During the construction process, the steel bars in the pile cap will inevitably be damaged or bent. In addition, the pile breaking project is large in volume, consumes huge manpower and material resources, and has low economic efficiency. Therefore, how to adopt a new pile cap structure to overcome the outstanding shortcomings of the traditional pile head breaking construction method and improve work efficiency is an important issue that needs to be solved. Summary of the invention

[0003] In order to solve the above problems, the present invention discloses an integrated pile foundation structure for an LNG tank body, which utilizes a new type of pile cap steel retaining wall, a steel cage positioning steel plate and a pile cap positioning steel ring to form a new pile cap structure, which has the outstanding advantages of not requiring soil excavation between piles, removing pile caps, merging the maintenance time of piles and pile caps, greatly improving construction efficiency, shortening construction period, etc.

[0004] An integrated pile foundation structure for an LNG tank includes a steel pipe retaining wall, a concrete pile, a pile cap cushion layer, a pile cap steel retaining wall, a positioning steel plate, a pile cap positioning steel ring, and connecting bolts. The steel pipe retaining wall enters the soil layer through a vibration impact construction method to form a pile hole. After the pile hole is cleaned, the steel cage in the concrete pile is placed in the pile hole, and concrete is poured to form a concrete pile. After the head of the steel cage is exposed to the ground, the pile cap cushion layer is poured, and the pile cap steel retaining wall is placed on the pile cap cushion layer, and at the same time, the longitudinal steel bars in the steel cage are passed through the holes of the pile cap positioning steel ring. The concrete in the pile cap steel retaining wall is poured to form the pile cap.

[0005] Further improvement of the utility model: the steel pipe protective wall is a tubular structure made of circular cross-section steel pipe or directional cross-section steel pipe or other types of materials, which is used as a template and supporting structure when pouring concrete in concrete piles.

[0006] Further improvement of the utility model: the pile cap steel retaining wall is located on the pile cap cushion layer, and is a tubular structure made of a circular cross-section steel pipe or a directional cross-section steel pipe with side flanges or other types of materials. Positioning steel plates are placed on the side flanges and connected by connecting bolts.

[0007] Further improvement of the utility model: the pile cap positioning steel ring is used to position the longitudinal steel bars in the steel cage in the concrete pile to avoid deviation when pouring concrete in the pile cap.

[0008] Further improvement of the utility model: the positioning steel plate is an L-shaped steel plate, one end of which is connected to the pile cap positioning steel ring by welding, and the other end is connected to the pile cap steel retaining wall by connecting bolts.

[0009] The working principle of the utility model is as follows: a steel pipe retaining wall is inserted into the soil layer through a vibration impact construction method to form a pile hole; after the pile hole is cleaned, a steel cage in a concrete pile is placed in the pile hole, and concrete is poured to form a concrete pile; after the head of the steel cage is exposed to the ground, a pile cap cushion is poured, and the pile cap steel retaining wall is placed on the pile cap cushion, and at the same time, the longitudinal steel bars in the steel cage are passed through the holes of the pile cap positioning steel ring; and concrete in the pile cap steel retaining wall is poured to form a pile cap.

[0010] Beneficial effects of the utility model:

[0011] The LNG tank integrated pile foundation structure proposed in the present invention avoids the disadvantageous phenomenon that the pile cap and the pile cap reinforcement joint are located at the pile top in the traditional process, and the main reinforcement joint can be placed at a position up to 11 m below the pile top.

[0012] The concrete construction joint between the pile and the cap in traditional technology is avoided, thus improving the performance of the pile body.

[0013] There is no excavation or backfilling during the pile cap construction process, thus avoiding disturbance of the surface soil.

[0014] There is no need to excavate the soil between piles, remove the pile heads, or combine the maintenance time of piles and pile caps, which can greatly improve construction efficiency and shorten the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the side surface of the LNG tank integrated pile foundation structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the plane of the LNG tank integrated pile foundation structure of the present invention.

[0017] The reference numerals are:

[0018] 1- steel pipe retaining wall, 2- concrete pile, 3- pile cap cushion, 4- pile cap steel retaining wall, 5- positioning steel plate, 6- pile cap positioning steel ring, 7- connecting bolt, 8- steel cage, 9- longitudinal steel bar, 10- hole, 11- pile cap. DETAILED DESCRIPTION

[0019] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0020] like Figure 1 As shown, this embodiment provides an integrated pile foundation structure of an LNG tank, including: a steel pipe retaining wall 1, a concrete pile 2, a pile cap cushion layer 3, a pile cap steel retaining wall 4, a positioning steel plate 5, a pile cap positioning steel ring 6, and a connecting bolt 7. The steel pipe retaining wall 1 enters the soil layer through a vibration impact construction method to form a pile hole. After the pile hole is cleaned, the steel cage 8 in the concrete pile is placed in the pile hole, and concrete is poured to form a concrete pile 2. After the head of the steel cage 8 is exposed to the ground, the pile cap cushion layer 3 is poured, and the pile cap steel retaining wall 4 is placed on the pile cap cushion layer 3, and at the same time, the longitudinal steel bars 9 in the steel cage 8 pass through the holes 10 of the pile cap positioning steel ring 6. The concrete in the pile cap steel retaining wall 4 is poured to form a pile cap 11.

[0021] like Figure 1 , Figure 2 As shown, the steel pipe protective wall 1 is a tubular structure made of a circular cross-section steel pipe or a directional cross-section steel pipe or other types of materials, and is used as a template and support structure when pouring concrete in a concrete pile 2.

[0022] like Figure 1 As shown, the pile cap steel retaining wall 4 is located on the pile cap cushion layer 3 and is a tubular structure made of a circular cross-section steel pipe or a directional cross-section steel pipe with side flanges or other types of materials. A positioning steel plate 5 is placed on the side flange and connected by connecting bolts 7.

[0023] like Figure 1 , Figure 2 As shown, the pile cap positioning steel ring 6 is used to position the longitudinal steel bars 9 in the steel cage 8 in the concrete pile 2 to avoid displacement when pouring concrete in the pile cap 11 .

[0024] like Figure 1 , Figure 2 As shown, the positioning steel plate 5 is an L-shaped steel plate, one end of which is connected to the pile cap positioning steel ring 6 by welding, and the other end is connected to the pile cap steel retaining wall 4 by connecting bolts 7.

[0025] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above technical features.

Claims

1. An integrated pile foundation structure for an LNG tank, characterized in that: The invention comprises a steel pipe retaining wall (1), a concrete pile (2), a pile cap cushion layer (3), a pile cap steel retaining wall (4), a positioning steel plate (5), a pile cap positioning steel ring (6) and a connecting bolt (7); the steel pipe retaining wall (1) is inserted into the soil layer by a vibration impact construction method to form a pile hole; after the pile hole is cleaned, a steel cage (8) in the concrete pile (2) is placed in the pile hole, and concrete is poured to form a concrete pile (2); after the head of the steel cage (8) is exposed from the ground, the pile cap cushion layer (3) is poured, and the pile cap steel retaining wall (4) is placed on the pile cap cushion layer (3), and at the same time, one end of the longitudinal steel bar (9) in the steel cage (8) is passed through the hole (10) of the pile cap positioning steel ring (6); and concrete in the pile cap steel retaining wall (4) is poured to form a pile cap (11).

2. The LNG tank integrated pile foundation structure according to claim 1, characterized in that: The steel pipe protective wall (1) is a tubular structure made of circular cross-section steel pipes or angular cross-section steel pipes, and is used as a formwork and support structure when pouring concrete in a concrete pile (2).

3. The LNG tank integrated pile foundation structure according to claim 1, characterized in that: The pile cap steel retaining wall (4) is located on the pile cap cushion layer (3) and is a circular cross-section steel pipe or a directional cross-section steel pipe with side flanges. Positioning steel plates (5) are placed on the side flanges and connected via connecting bolts (7).

4. The LNG tank integrated pile foundation structure according to claim 1, characterized in that: The pile cap positioning steel ring (6) is used to position the longitudinal steel bars (9) in the steel cage (8) in the concrete pile (2) to prevent displacement when pouring concrete in the pile cap (11).

5. The LNG tank integrated pile foundation structure according to claim 1, characterized in that: The positioning steel plate (5) is an L-shaped steel plate, one end of which is connected to the pile cap positioning steel ring (6) by welding, and the other end of which is connected to the pile cap steel retaining wall (4) by connecting bolts (7).

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