Construction platform for transmission tower foundation in shallow sea area

Abstract

The utility model relates to the technical field of transmission tower construction, in particular to a construction platform for a transmission tower foundation in a shallow sea area, which comprises a tidal canal, a slurry area, a water pump, a slurry pump and a pouring operation area. The slurry pump conveys slurry in the slurry area to the grouting operation area to be deposited and accumulated to form a grouting platform, a plurality of pile foundation holes are dug in the range of the grouting platform, steel protection cylinders are installed in the pile foundation holes, a cement mixing soil layer is arranged at the bottoms of the pile foundation holes, and the lower portions of the steel protection cylinders are inserted into the cement mixing soil layer. The inner diameter of the cement mixing soil layer is matched with the outer diameter of the steel casing. According to the construction platform, on-site soil texture is utilized, water in a tidal canal is extracted to flush soil to form slurry, then the slurry is extracted to a pouring operation area to be deposited and accumulated layer by layer, a pouring platform meeting the construction requirement is formed, the construction period of construction is shortened, land resource investment is reduced, and project cost is saved.

Description

Technical Field

[0001] This utility model relates to the field of power transmission tower construction technology, specifically a construction platform for power transmission tower foundations in shallow sea areas. Background Technology

[0002] Cast-in-place pile foundations are mainly used in areas with poor geological conditions or scour sites. Their advantages include strong adaptability, high bearing capacity, and suitability for cohesive soil and sandy soil foundations with high groundwater levels. They are also widely used for scour sites across rivers. Their structural layout can be divided into single pile and group foundations, and in terms of installation method, they can be divided into low pile and high pile foundations, thus offering a wide range of design options. The disadvantages are that construction requires large machinery, requires a large temporary land area, and may require the construction of many temporary construction roads.

[0003] The shallow sea area has abundant tidal channels and its geology is mainly composed of silt and sand. Constructing power transmission line foundations in this area has always been a major challenge. It requires a large amount of earthwork for road and work platform construction, as well as extensive machinery and transport vehicles, resulting in long construction periods and high resource consumption. Furthermore, the loose soil of the sandy foundations and the bentonite-mud mixture pose a risk of borehole collapse within the sandy soil. Summary of the Invention

[0004] To address the aforementioned problems, this utility model provides a construction platform for power transmission tower foundations in shallow sea areas. Utilizing on-site conditions, the platform is formed by flushing and slurry accumulation to create a pouring platform, with a cement-mixed soil layer placed inside the pile foundation hole. This saves construction time and project costs, while improving the safety of the tower foundation. The technical solution adopted by this utility model is as follows:

[0005] A construction platform for power transmission tower foundations in shallow sea areas includes a tidal channel, a mud zone, a water pump, a mud pump, and a grouting operation area. The tidal channel is located in a shallow sea area. The water pump delivers water from the tidal channel into the mud zone. The mud pump transports the mud from the mud zone to the grouting operation area for sedimentation and accumulation to form a grouting platform. Several pile foundation holes are excavated within the grouting platform area. Steel casings are installed inside the pile foundation holes. A cement-mixed soil layer is provided at the bottom of the pile foundation holes. The lower part of the steel casing is inserted into the cement-mixed soil layer. The inner diameter of the cement-mixed soil layer matches the outer diameter of the steel casing.

[0006] The depth of the cement-mixed soil layer in the construction platform for the foundation of the power transmission tower in the aforementioned shallow sea area is 1.2~1.5m.

[0007] The aforementioned construction platform for the foundation of power transmission towers in shallow sea areas has a permeable cloth cofferdam along the edge of the grouting operation area. The cofferdam has a drainage outlet connected to a tidal channel.

[0008] The beneficial effects of this utility model are as follows: The construction platform utilizes the soil on site, draws water from the tidal channel to flush the soil and form mud, and then draws the mud to the grouting operation area to settle and accumulate layer by layer to form a grouting platform that meets the construction requirements, saving the construction cycle, reducing land resource input, and saving project costs; in addition, the cement-mixed soil layer is filled under the steel casing to pour the grouting hole, ensuring that the hole will not collapse during the foundation construction process, effectively reducing safety risks. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the construction platform layout according to an embodiment of the present utility model;

[0010] Figure 2 This is a schematic diagram of a cast-in-place pile according to an embodiment of the present utility model;

[0011] Figure 3 This is a side view of the foundation after construction using an embodiment of this utility model.

[0012] In the diagram: 1 is the mud zone, 2 is the grouting operation zone, 21 is the cofferdam, 22 is the drainage outlet, 3 is the pile foundation hole, 31 is the cement-mixed soil layer, 32 is the steel casing, and 4 is the crossbeam. Detailed Implementation

[0013] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings.

[0014] The following embodiments are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical terms used have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should be noted that the terminology used is for the purpose of describing particular embodiments only and is not intended to be limiting according to this application.

[0015] This embodiment describes a construction platform for power transmission tower foundations in shallow sea areas, such as... Figure 1 and Figure 2 As shown, the system includes a tidal channel, a mud zone 1, a water pump, a mud pump, and an injection operation area 2. The tidal channel is located in a shallow sea area. The water pump delivers water from the tidal channel into the mud zone 1. The mud pump transports the mud from the mud zone 1 to the injection operation area 2 for sedimentation and accumulation, forming an injection platform. The edge of the injection operation area 2 is equipped with a permeable cloth cofferdam 21, which can block the mud to prevent loss and accelerate sedimentation and accumulation. The cofferdam 21 has a drainage outlet 22, which is connected to the tidal channel. Water from the accumulated mud flows from the drainage outlet 22 into the tidal channel.

[0016] Several pile foundation holes 3 are excavated within the grouting platform area. Steel casings 32 are installed inside each pile foundation hole 3 to stabilize it and prevent collapse. They also isolate surface water and guide the drill bit. A cement-mixed soil layer 31 is located at the bottom of each pile foundation hole 3. The lower part of the steel casing 32 is inserted into the cement-mixed soil layer 31, and the inner diameter of the cement-mixed soil layer 31 matches the outer diameter of the steel casing 32. Specifically, the depth of the cement-mixed soil layer 31 is 1.2~1.5m, and its diameter is slightly larger than that of the steel casing 32. The cement-mixed soil layer 31 is made by mixing cement with the foundation sand (i.e., the soil excavated during the pile foundation hole 3 excavation), making the soil around the pile foundation hole 3 firm and greatly reducing the risk of collapse. Water pumps and mud pumps are commercially available equipment, and a diesel generator can be configured on-site for driving. All equipment can be placed in suitable locations (not shown in the attached diagram).

[0017] The operating steps for this construction platform are as follows:

[0018] ① Determine mud zone 1 and grouting operation zone 2 according to the design drawings. Set up cofferdam 21 in grouting operation zone 2. Prepare mud in mud zone 1. Use mud pump to pump mud to grouting operation zone 2 for sedimentation and accumulation, gradually forming a grouting platform; this can save 3 / 4 of the backfill soil and save project costs.

[0019] ② After the mud on the grouting platform solidifies, positioning and layout are carried out. The pile hole 3 is excavated to about 1.5m below the steel casing 32. Cement is mixed with the excavated soil and backfilled to form a cement-mixed soil layer 31. The outer diameter of the cement-mixed soil layer 31 is slightly larger than the outer diameter of the steel casing 32. When it reaches the initial setting, excavation continues to remove the cement-mixed soil layer 31 inside the pile hole 3. Then the steel casing 32 is lowered and installed. In this way, the bottom of the pile hole 3 is equipped with a cement-mixed soil layer 31, and the steel casing 32 is inserted into the cement-mixed soil layer 31, which greatly avoids the problem of hole collapse.

[0020] ③ Add an appropriate amount of chemical mud to the mud pit to adjust the mud viscosity, and use the grouting method to complete the grouting of the pile foundation hole 3 to obtain the cast-in-place pile 5. A crossbeam 4 can be set between adjacent cast-in-place piles 5 to improve the overall strength.

[0021] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various changes or improvements without departing from the principles of this application, and these changes or improvements should also be considered within the scope of protection of this application.

Claims

1. A construction platform for power transmission tower foundations in shallow sea areas, characterized in that: The system includes a tidal channel, a mud zone (1), a water pump, a mud pump, and a grouting operation area (2). The tidal channel is located in a shallow sea area. The water pump delivers water from the tidal channel into the mud zone (1). The mud pump transports the mud from the mud zone (1) to the grouting operation area (2) for sedimentation and accumulation to form a grouting platform. Several pile foundation holes (3) are excavated within the grouting platform area. A steel casing (32) is installed inside the pile foundation hole (3). A cement-mixed soil layer (31) is provided at the bottom of the pile foundation hole (3). The lower part of the steel casing (32) is inserted into the cement-mixed soil layer (31). The inner diameter of the cement-mixed soil layer (31) matches the outer diameter of the steel casing (32).

2. The construction platform for power transmission tower foundations in shallow sea areas according to claim 1, characterized in that: The depth of the cement-mixed soil layer (31) is 1.2~1.5m.

3. The construction platform for power transmission tower foundations in shallow sea areas according to claim 1, characterized in that: The edge of the grouting operation area (2) is provided with a permeable cloth cofferdam (21), the cofferdam (21) is provided with a drainage outlet (22), and the drainage outlet (22) is connected to the tidal channel.

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