Directly-buried steel casing dewatering device

Abstract

The utility model discloses a direct-buried steel casing dewatering device which is suitable for dewatering treatment in foundation pit construction of underground engineering. The device comprises a directly-buried pile casing, a water pump arranged in the pile casing, a device for sealing a pile casing opening, a concrete structure for fixing the pile casing and a water burst monitoring system. The direct burial pile casing is arranged at a water gushing point, the gushing water diffusion range is effectively controlled, underground water is continuously pumped and drained through the water pump, and meanwhile the pile casing is fixed through concrete, so that the structural stability is improved. The device can efficiently and economically solve the water gushing problem in foundation pit construction, ensures smooth proceeding of engineering, and is suitable for underground engineering near the river and other underground construction environments.

Description

Technical Field

[0001] This utility model relates to dewatering equipment for foundation pits in building construction projects. Background Technology

[0002] Currently, my country's construction industry has entered a new stage of expanding underground space. Underground spaces are affected by groundwater, especially in riverside projects. Due to historical changes in river channels, the soil near riverbanks is often rich in sand, making the groundwater level highly susceptible to river water levels. This can easily lead to water inrush during excavation. Water inrush is a common hazard in engineering projects, and numerous scholars have studied and addressed its management. Two common methods exist for water inrush control: one is diversion, which involves connecting the inrush water to a dewatering well via a reverse-filter blind ditch; the other is grouting, which uses a two-component grouting method to inject liquid into the inrush point, utilizing the rapid solidification of the two liquids to seal the inrush. However, for complex riverside underground projects, these two methods may not meet the economic and efficiency requirements of actual site conditions. Utility Model Content

[0003] The technical problem to be solved by this utility model is: to design a device to solve the problem of rapid precipitation.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: First, a protective casing is directly buried at the water inrush point to control the influence range of the water inrush. Then, a water pump is installed in the casing to pump out the water inrush, so that the water inrush does not overflow from the casing opening. Finally, the casing opening is sealed, leaving a water pump inside the casing for pumping, until the base plate structure is completed. The water pump and drainage pipe are sealed after the base plate is completed.

[0005] Compared with existing technologies, the advantages of this invention are as follows: the direct-buried steel casing can effectively control the impact of water inflow on the foundation pit construction; the high-power water pump enables the drainage of water inflow, ensuring the normal construction of the foundation pit project; and water inflow monitoring can effectively predict the safety of the foundation pit. Its application in engineering projects with relatively low rainfall yields good quality and economic benefits. Attached Figure Description

[0006] Figure 1 . Schematic diagram of the casing being pressed into the elevation.

[0007] Figure 2 Schematic diagram of water pump and filtration device installation.

[0008] Figure 3 Schematic diagram of concrete casing fixing.

[0009] Figure 4 . Schematic diagram of the sealed casing opening. Detailed Implementation

[0010] Direct-buried casing: The casing is pressed into the soil layer where water is flowing, preventing the water from spreading to the surrounding area. The depth, angle and method of pressing must be considered to avoid multiple disturbances to the soil layer. The casing plays a key role in water inrush control, effectively controlling the flow direction of the water and reducing the scouring effect of the water on the foundation pit soil layer.

[0011] Install water pumps: The power of the water pumps should meet the demand for water flow, and the head of the water pumps in deep foundation pits should meet the depth requirements of the foundation pits.

[0012] The casing opening is sealed: the water pump pumps water out of the casing to control the water level inside the casing. The casing opening is fully sealed to further control the water level inside the casing and prevent it from overflowing. The casing is firmly fixed in place by concrete around its perimeter, so that the casing will not shift due to water pressure and become ineffective.

[0013] Water inflow monitoring: After the water pumping pipe is installed, a water meter is installed at the outlet to monitor and record the water inflow. Based on the monitoring data, the start-up time of the main water pump and the standby water pump is adjusted to ensure the stable and effective operation of the water pump.

[0014] The present invention will be further described in detail below with reference to the drawings.

[0015] Figure 1 This is a schematic diagram of the casing being pressed into the soil layer (2) at the water inflow point. The size of the casing (1) is determined according to the range of water inflow, and its diameter must cover the water inflow area. The pressing depth of the casing (1) is determined according to the location of the water inflow channel. The exposed height of the casing (1) after pressing in must meet the construction requirements for placing the water pump. Alternatively, the casing (1) can be heightened after the pressing effect is achieved to meet the construction requirements. The control standard for the burial of the casing (1) is that no water inflow occurs outside the casing (1), and all water inflow emerges from inside the casing (1). During the pressing of the casing (1), due to the complex geological conditions, it is difficult to determine the location of the water inflow channel. Often, after the casing (1) is pressed in, water still emerges from outside the casing (1). It is necessary to observe the water inflow situation after pressing in the casing (1) and readjust the position and pressing depth of the casing (1) until all water inflow emerges from inside the casing (1).

[0016] Figure 2A schematic diagram of the installation of the water pump and filter device is provided. One main water pump (3) is placed inside the casing, and one standby water pump (11) is also placed inside. A rigid PP-R pipe (4) with a diameter of 100 mm is used to connect to the flange (7) of the water pump (3). The power, pumping capacity and head of the water pump are determined according to the calculation of the water flow. Before placing the water pump (3), a filter screen (6) is set inside the casing (1). The filter screen (6) is made of geotextile and is fixed with a steel welded bracket to prevent the influence of silt (2) on the water pump. After the pumping pipe (4) is installed, a water meter (5) is installed at the outlet to monitor and record the water flow. According to the monitoring data, the start-up time of the main water pump (3) and the standby water pump (11) is adjusted to ensure the stable and effective operation of the water pump.

[0017] Figure 3 A schematic diagram of the concrete fixing of the casing. After the water pumps (3, 11) are installed, concrete (8) is poured on the outside of the casing (1) to fix the position of the casing (1). At the same time, the concrete (8) and the casing (1) work together to resist the force of uneven backfilling and protect the casing (1) from damage caused by backfilling. The concrete (8) fixing the casing (1) and the concrete sealing the casing opening are connected by steel bars (9) to form two layers of concrete. When the concrete (8) fixing the casing is poured, steel bars (9) with a diameter of 20 mm and a length of 500 mm are embedded and extend into each of the two layers of concrete by 250 mm to ensure that the upper and lower layers of concrete work together to resist the water pressure inside the casing.

[0018] Figure 4 This is a schematic diagram of the casing opening closure. A transverse steel reinforcement frame (2) is welded to the casing (1) opening, and then a steel plate (3) is welded onto the casing (1) opening to completely seal it, leaving space for the drainage pipe (4). The gap between the drainage pipe (4) and the steel plate (3) is treated with sealant. Then, concrete (10) is poured onto the casing (1) opening, connecting it to the previous concrete (8) to form a whole. After the concrete reaches its strength, backfill soil and compact it to carry out the foundation pit construction.

Claims

1. A direct buried steel casing dewatering device characterized by, It comprises: a casing which is pressed into the soil at the water gushing point; a water pump which is placed in the casing to pump out the water; a steel plate which is welded at the mouth of the casing to completely seal the mouth of the casing; concreting outside the casing to fix the position of the casing; a water meter which is installed at the outlet of the water pumping pipe to monitor and record the water gushing.

2. The straight-buried steel casing water lowering device according to claim 1, wherein: the water pump comprises a normal water pump and a standby water pump.

3. The straight-buried steel casing water lowering device according to claim 1, wherein: the steel plate which is welded at the mouth of the casing leaves a position for the water discharge pipe, and the gap between the water discharge pipe and the steel plate is treated with sealing glue.

4. The straight-buried steel casing water lowering device according to claim 1, wherein: when the casing is concreted outside, a steel bar with a diameter of 20 mm and a length of 500 mm is embedded, and the steel bar extends into the upper and lower layers of concrete by 250 mm respectively.

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