Circulating water pipeline foundation structure for large-area soil filling site of soft soil foundation

Abstract

The utility model relates to a circulating water pipeline foundation structure for a soft soil foundation large-area soil filling field, which comprises a foundation structure body, and the foundation structure body consists of a plurality of settlement reduction composite sparse piles, a raft foundation, a reinforced concrete wing wall, an artificial soil arc sand foundation, backfill plain soil and a circulating water pipeline, the bottoms of the subsidence reduction composite sparse piles penetrate through the upper soft soil layer and are supported on the hard soil layer, the tops of the subsidence reduction composite sparse piles are embedded into the raft foundation, reinforced concrete wing walls are poured over the raft foundation, the space between the raft foundation and the reinforced concrete wing walls is filled with an artificial soil arc sand foundation, and a circulating water pipeline is placed in the artificial soil arc sand foundation. A gap is reserved between the circulating water pipeline and the raft foundation, and the backfill plain soil is used for filling other remaining excavation areas. The device is simple and reasonable in structure, pipeline sedimentation is reliably and effectively controlled, and powerful support can be provided for soil arc sand foundations on the two sides of the thoracic cavity of the pipeline, so that the operation safety of the circulating water pipeline is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic structures of power plants, and relates to a large-scale circulating water pipeline foundation structure of a large-area filling site on a soft soil foundation of a coastal power plant, and specifically relates to a circulating water pipeline foundation structure used for a large-area filling site on a soft soil foundation. Background Art

[0002] The circulating water pipeline of a thermal power plant connects the main plant and the circulating water pump room. It is the main artery of the thermal power plant. The cooling water it transports is a necessary condition for the normal operation of the entire power plant. Power plants in coastal areas are often built on deep soft soil foundation sites near the coast. At the same time, large areas of landfill are carried out to meet the elevation requirements, which leads to serious settlement of the entire plant area.

[0003] On the one hand, due to the inconsistency between the foundation treatment methods of the site structures and the pipelines, and the uneven distribution of the geological soil layers on the site, the settlement in the plant area is often very uneven. In order to prevent the circulating water pipeline, especially near the interface, from breaking, damage, and leakage due to uneven settlement, and to ensure the safety of the circulating water pipeline, the foundation of the circulating water pipeline is generally treated to a certain extent. Conventional treatment methods in the past, such as cement mixing piles or high-pressure jet spraying pile composite foundations, have not achieved very ideal treatment results due to factors such as slow construction progress, shallow treatment depth, and difficult to control construction quality. Moreover, these treatment methods will affect the construction site environment and undermine the requirements of civilized construction management.

[0004] On the other hand, due to the uneven settlement of the soil, the compacted fill on both sides of the circulating water pipeline chest and the soil arc sand foundation at the bottom became loose and could not effectively support the pipeline, causing the pipeline to be severely deformed and damaged under the upper load. The above damage to the circulating water pipeline will seriously affect the normal operation of the power plant, and more reliable and effective measures must be taken to ensure the safety of the circulating water pipeline.

[0005] Therefore, a circulating water pipeline foundation structure for a large area of ​​filling site on soft soil foundation is designed to overcome the above problems. Summary of the invention

[0006] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a circulating water pipeline foundation structure for large-area fill sites on soft soil foundations, which has a simple and reasonable structure, can reliably and effectively control pipeline settlement, and can provide strong support for the soil arc sand foundation on both sides of the pipeline chest, thereby ensuring the safe operation of the circulating water pipeline.

[0007] The utility model is realized through the following technical scheme: a circulating water pipeline foundation structure for a large-area filling site on a soft soil foundation, comprising a foundation structure body, wherein the foundation structure body is composed of a subsidence reducing composite sparse pile, a raft foundation, a reinforced concrete wing wall, an artificial soil arc sand foundation, backfilled soil and a circulating water pipeline, wherein the subsidence reducing composite sparse pile is a plurality of piles arranged in a rectangular or plum blossom-shaped structure, wherein the bottom of the subsidence reducing composite sparse pile passes through an upper soft soil layer and is supported on a hard soil layer, wherein the top of the subsidence reducing composite sparse pile is embedded in the raft foundation, and thus plays a good supporting role for the raft foundation, wherein reinforced concrete wing walls are respectively cast at positions just above the edges of both sides of the raft foundation, and an artificial soil arc sand foundation is filled between the raft foundation and the reinforced concrete wing wall, wherein a circulating water pipeline is placed in the artificial soil arc sand foundation, and a spacing is left between the circulating water pipeline and the raft foundation, and the backfilled soil is used to fill other remaining excavated areas.

[0008] Preferably, the subsidence reducing composite sparse piles are PHC prefabricated pipe piles with a diameter of φ300 to φ400.

[0009] Preferably, the raft foundation adopts a reinforced concrete structure and is cast integrally with the reinforced concrete wing wall.

[0010] Preferably, a horizontal distance is left between the reinforced concrete wing wall and the pipeline, and the horizontal distance is used to meet the requirements of circulating water pipeline installation and backfill construction; the reinforced concrete wing wall is used to provide lateral support for the artificial soil arc sand foundation on both sides of the chest of the circulating water pipeline.

[0011] Preferably, the artificial soil arc sand foundation is paved in layers with medium and coarse sand so that the compaction degree meets the design requirements.

[0012] The beneficial effects of the utility model are as follows:

[0013] The utility model adopts a settlement-reducing composite sparse pile foundation formed by PHC prefabricated pipe piles, which has fast construction progress, controllable quality, and good construction environment. It can effectively control the settlement of circulating water pipelines in large-area fill sites on soft soil foundations. At the same time, the reinforced concrete wing walls can provide support for the earth arc sand foundations on both sides of the pipeline chest cavity, give full play to the overall effect of the structure, and thus ensure the safe operation of the circulating water pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional schematic diagram of the utility model.

[0015] Figure 2 It is a schematic longitudinal section diagram of the utility model. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to more clearly understand the objectives, technical solutions and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] In the description of the present invention, it is necessary to understand that the orientation or position relationship indicated by the terms such as "up", "down", "left", "right", "inside", "outside", "horizontal" and "vertical" is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or original referred to must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] The present invention will be described in detail below with reference to the accompanying drawings: Figure 1-2 As shown, a circulating water pipeline foundation structure for a large-area filling site on a soft soil foundation includes a foundation structure body, wherein the foundation structure body is composed of a settlement reducing composite sparse pile 1, a raft foundation 2, a reinforced concrete wing wall 3, an artificial soil arc sand foundation 4, backfill soil 5 and a circulating water pipeline 6. The settlement reducing composite sparse pile 1 is a plurality of piles arranged in a rectangular or plum blossom shape. The bottom of the settlement reducing composite sparse pile 1 passes through the upper soft soil layer and is supported on the hard soil layer. The top of the settlement reducing composite sparse pile 1 is embedded in the raft foundation, which plays a good supporting role for the raft foundation 2. Reinforced concrete wing walls 3 are respectively cast at the positions directly above the edges of both sides of the raft foundation 2, and an artificial soil arc sand foundation 4 is filled between the raft foundation 2 and the reinforced concrete wing wall 3. A circulating water pipeline 6 is placed in the artificial soil arc sand foundation 4, and a spacing 7 is left between the circulating water pipeline 6 and the raft foundation 2 to prevent the circulating water pipeline from being damaged by friction and extrusion between the raft foundation. The backfill soil 5 is used to fill other remaining excavation areas.

[0019] The subsidence reducing composite sparse pile 1 adopts PHC prefabricated pipe pile with a diameter of φ300 to φ400. The pile end of the subsidence reducing composite sparse pile passes through the upper soft soil layer and is supported on a relatively hard soil layer. The pile spacing is greater than 5 to 6 times the pile diameter. In addition to meeting the bearing capacity requirements, the number of piles should also be finally determined by settlement calculation. The raft foundation 2 is located at a certain distance below the circulating water pipeline 6, generally 300mm, and adopts a reinforced concrete structure. The thickness and reinforcement meet the requirements of shear resistance and bending bearing capacity, and are cast integrally with the reinforced concrete wing wall 3.

[0020] The raft foundation 2 is a reinforced concrete structure and is cast integrally with the reinforced concrete wing wall 3 .

[0021] A horizontal distance is left between the reinforced concrete wing wall 3 and the pipeline, and the horizontal distance is used to meet the installation and backfill construction requirements of the circulating water pipeline 6. The thickness and reinforcement meet the requirements of bending bearing capacity and the like. The reinforced concrete wing wall 3 is used to provide lateral support for the artificial soil arc sand foundation 4 on both sides of the chest cavity of the circulating water pipeline 6.

[0022] The artificial soil arc sand foundation 4 is laid in layers with medium-coarse sand, with the particle size of 0.25-2.0mm exceeding 75% of the total weight, the maximum particle size of slag is less than 100mm, and the mud content is less than 10%, and the compaction degree meets the design requirements. The compaction degree of the bottom of the pipe is generally 0.85-0.90, and the compaction degree of the chest part is not less than 0.95; the backfill soil 5 is used to fill other remaining excavation areas, and silt soil, miscellaneous fill soil, cultivated soil, etc. shall not be used. It is laid in layers according to the design compaction requirements. Generally, the compaction degree of the part above the pipe top is not less than 0.92, and the compaction degree of the part from the pipe top to the chest is not less than 0.95.

[0023] The utility model has a simple structure, fast construction progress and good construction environment. The settlement reduction composite sparse pile foundation formed by the PHC prefabricated pipe piles can effectively control the settlement of the circulating water pipeline in the large-scale filling site on the soft soil foundation. At the same time, the reinforced concrete wing wall can provide support for the soil arc sand foundation on both sides of the pipeline chest cavity, giving full play to the overall role of the structure, thereby ensuring the safe operation of the circulating water pipeline. According to calculation and analysis, the circulating water pipeline foundation structure of the utility model has good force performance and meets the requirements of the specification. It has been successfully applied to the practice of coastal power plant engineering in the large-scale filling site on the soft soil foundation.

[0024] The specific embodiments described herein are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A circulating water pipeline foundation structure for a large area of ​​soft soil filling site, comprising a foundation structure body, characterized in that: The foundation structure body is composed of a subsidence reducing composite sparse pile (1), a raft foundation (2), a reinforced concrete wing wall (3), an artificial soil arc sand foundation (4), backfilled soil (5) and a circulating water pipeline (6). The subsidence reducing composite sparse pile (1) is a plurality of piles arranged in a rectangular or plum blossom-shaped structure. The bottom of the subsidence reducing composite sparse pile (1) passes through the upper soft soil layer and is supported on the hard soil layer. The top of the subsidence reducing composite sparse pile (1) is embedded in the raft foundation, which plays a good supporting role for the raft foundation (2). Reinforced concrete wing walls (3) are respectively cast at the positions directly above the edges of both sides of the raft foundation (2), and an artificial soil arc sand foundation (4) is filled between the raft foundation (2) and the reinforced concrete wing wall (3). A circulating water pipeline (6) is placed in the artificial soil arc sand foundation (4), and a spacing (7) is left between the circulating water pipeline (6) and the raft foundation (2). The backfilled soil (5) is used to fill the remaining excavated area.

2. The circulating water pipeline foundation structure for a large-area filling site on a soft soil foundation according to claim 1 is characterized in that: The subsidence reducing composite sparse pile (1) adopts PHC prefabricated pipe piles with a diameter of φ300 to φ400.

3. The circulating water pipeline foundation structure for a large-area filling site on a soft soil foundation according to claim 1 is characterized in that: The raft foundation (2) adopts a reinforced concrete structure and is cast integrally with the reinforced concrete wing wall (3).

4. The circulating water pipeline foundation structure for a large-area filling site on a soft soil foundation according to claim 3 is characterized in that: A horizontal distance is left between the reinforced concrete wing wall (3) and the pipeline, and the horizontal distance is used to meet the requirements for the installation and backfill construction of the circulating water pipeline (6); the reinforced concrete wing wall (3) is used to provide lateral support for the artificial soil arc sand foundation (4) on both sides of the chest cavity of the circulating water pipeline (6).

5. The circulating water pipeline foundation structure for a large-area filling site on a soft soil foundation according to claim 4 is characterized in that: The artificial soil arc sand foundation (4) is paved in layers using medium-coarse sand, and the compaction degree meets the design requirements.

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