Simple light-weight well point hole tool for sand

Abstract

The utility model provides a sand ground simple light well point lead -in hole tool, its characterized in being: including lead -in hole long lever, fixed lead -in hole jet pipe in the bottom of lead -in hole long lever, hose and booster water pump with the upper end butt joint of lead -in hole jet pipe, the water outlet of booster water pump is butt -jointed with hose, and the outer diameter of lead -in hole jet pipe is greater than the outer diameter of lead -in hole long lever, the utility model discloses with lead -in hole jet pipe and forms the hole in the water flow of pumping and sprays to the soil layer, with the downward movement of lead -in hole long lever and the downward spraying cooperation of lead -in hole jet pipe, both form lead -in hole direction, avoid lead -in hole deflection, and according to the falling length of lead -in hole long lever can also grasp the lead -in hole depth, realize the lead -in hole according to the depth demand, and the lead -in hole tool structure is simple and easy to form and is convenient, and the lead -in hole process operation is simple and easy, improves the lead -in hole efficiency, and reduces the lead -in hole cost, is applicable to the simple light well point's quick lead -in hole in sand ground soil quality.

Description

Technical Field

[0001] This utility model relates to a simple and lightweight wellpoint pilot hole tool for sandy soil, used for lightweight wellpoint pilot hole construction in foundation pit dewatering projects. Background Technology

[0002] In foundation pit engineering, when the groundwater level at the pit is higher than the design excavation elevation, dewatering is necessary before excavation to lower the water level and ensure the working surface remains dry, thus improving construction safety. Wellpoint dewatering refers to the process of setting up wellpoints around or inside the foundation pit to drain accumulated water, groundwater, or rainwater, thereby lowering the groundwater level and ensuring the safety and smooth progress of foundation pit construction. The arrangement of the wellpoints significantly impacts the dewatering effect and construction safety. Lightweight wellpoint dewatering is widely used in foundation pit dewatering projects due to its rapid dewatering rate. However, lightweight wellpoints require a large number of pilot holes, resulting in low efficiency and high cost of mechanical drilling, especially in sandy soil where mechanical drilling can easily lead to hole collapse and the need for secondary pilot holes. Based on past construction experience and market research, the cost of drilling pilot holes is generally 300 yuan per meter, and drilling to a depth of 10 meters requires half an hour to an hour (excluding mechanical transport time), resulting in high construction costs and low efficiency. Utility Model Content

[0003] This utility model provides a simple and lightweight wellpoint pilot hole tool for sandy soil. A pilot hole jet pipe sprays pumped water into the soil layer to form a hole. The downward movement of the pilot hole rod, in conjunction with the downward spraying of the pilot hole jet pipe, not only guides the pilot hole and prevents it from deviating, but also allows control of the pilot hole depth based on the descent length of the pilot hole rod, enabling pilot hole drilling according to depth requirements. The tool has a simple structure and is easy to form, and the pilot hole process is simple to operate, improving pilot hole efficiency and reducing pilot hole costs. It is suitable for rapid pilot hole drilling of simple lightweight well points in sandy soil.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A simple and lightweight wellpoint pilot hole tool for sandy terrain is characterized by comprising a pilot hole rod, a pilot hole jet pipe fixed at the bottom of the pilot hole rod, a hose connected to the upper end of the pilot hole jet pipe, and a booster water pump. The outlet end of the booster water pump is connected to the hose, and the outer diameter of the pilot hole jet pipe is larger than the outer diameter of the pilot hole rod.

[0006] Preferably, the long rod for the pilot hole is formed by connecting multiple segmented rods sequentially from bottom to top. The uppermost segmented rod is a solid rod or has its top sealed, while the lowermost segmented rod has the longest length. The length of each segmented rod is 3 to 4 meters, and the outer diameter of each segmented rod does not exceed 25 mm.

[0007] Preferably, the pilot jet pipe is welded to the lowest segment rod, and the bottom end of the pilot jet pipe is located below the bottom end of the pilot long rod.

[0008] Preferably, the length of the pilot jet pipe is 40~60cm, the wall thickness is 3~4mm, the inner diameter is 50±5mm, and the bottom of the pilot jet pipe has a conical tip, in which a jet through hole with an inner diameter smaller than the inner diameter of the pilot jet pipe is opened.

[0009] Preferably, the top of the jet pipe has an external threaded interface, and one end of the hose has an internal threaded connector that mates with the external threaded interface.

[0010] Preferably, the length of the hose is not less than the length of the pilot hole rod.

[0011] The beneficial effects of this utility model are:

[0012] This utility model discloses a simple and lightweight wellpoint pilot-hole tool for sandy soil. A pilot-hole jet pipe is fixed to the bottom of a pilot-hole rod. A flexible hose connects the booster pump and the pilot-hole jet pipe. During wellpoint pilot-hole drilling, the pilot-hole rod is first inserted and erected in the sandy soil, allowing the pilot-hole jet pipe to penetrate the soil layer. Then, the booster pump is activated, and water is drawn into the pilot-hole jet pipe through the hose. The water is ejected from the pilot-hole jet pipe, powerfully spraying the soil layer below to form a hole. Simultaneously, the pilot-hole rod is slowly inserted downwards, allowing the pilot-hole jet pipe to gradually spray downwards, increasing the hole depth. The flexible hose follows the pilot-hole jet pipe into the hole. When the pilot-hole rod descends to the required depth for wellpoint pilot-hole drilling, the booster pump is first turned off, and then... Quickly pull up the pilot hole rod to remove the hose and pilot hole jet pipe from the hole, completing the pilot hole setup. After pulling the pilot hole jet pipe out of the hole, it should be quickly inserted into the dewatering pipe to prevent the hole from collapsing and causing secondary pilot hole setup. Use the pilot hole jet pipe to spray the pumped water into the soil layer to form a hole. The downward movement of the pilot hole rod and the downward spray of the pilot hole jet pipe work together to guide the pilot hole, preventing it from deviating. The pilot hole depth can also be controlled according to the descent length of the pilot hole rod, realizing pilot hole setup according to the required depth. The pilot hole tool has a simple structure and is easy to form. The pilot hole setup process is simple to operate, improving pilot hole setup efficiency and reducing pilot hole setup costs. It is suitable for rapid pilot hole setup of simple lightweight well points in sandy soil. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a simple lightweight well point pilot hole tool for sandy terrain, as described in a specific implementation.

[0014] Figure 2 This is an exploded view of the long rod used for drilling.

[0015] Figure 3 This is a schematic diagram of the pilot jet nozzle. Detailed Implementation

[0016] The following is combined with Figures 1-3 The embodiments of this utility model will be described in detail below.

[0017] A simple lightweight wellpoint pilot hole tool for sandy terrain is characterized by comprising a pilot hole rod 1, a pilot hole jet pipe 2 fixed at the bottom of the pilot hole rod 1, a flexible hose 3 connected to the upper end of the pilot hole jet pipe 2, and a booster water pump 4. The outlet end of the booster water pump 4 is connected to the flexible hose 3, and the outer diameter of the pilot hole jet pipe 2 is larger than the outer diameter of the pilot hole rod 1.

[0018] The simple lightweight wellpoint pilot tool described above for sandy soil consists of a pilot nozzle 2 fixed to the bottom of the pilot nozzle rod 1. A flexible hose 3 connects the booster pump 4 and the pilot nozzle 2. During wellpoint piloting, the pilot nozzle rod 1 is first inserted and erected in the sandy soil, allowing the pilot nozzle 2 to penetrate the sandy soil layer. Then, the booster pump 4 is activated, drawing water through the hose 3 into the pilot nozzle 2. The water is then ejected from the pilot nozzle 2, powerfully spraying the soil layer below to form a hole. Simultaneously, the pilot nozzle rod 1 is slowly inserted downwards, allowing the pilot nozzle 2 to gradually spray downwards, increasing the hole depth. The hose 3 follows the pilot nozzle 2 into the hole. When the pilot nozzle rod 1 reaches the required depth for wellpoint piloting, the booster pump is shut off. Pump 4 then quickly lifts the pilot hole rod 1 to pull the hose 3 and pilot hole jet pipe 2 out of the hole, completing the pilot hole. After pulling the pilot hole jet pipe 2 out of the hole, it should be quickly inserted into the dewatering pipe to prevent the hole from collapsing and causing secondary pilot hole drilling. The pumped water is sprayed into the soil layer using the pilot hole jet pipe 2 to form a hole. The downward movement of the pilot hole rod 1 and the downward spray of the pilot hole jet pipe 2 work together to guide the pilot hole, preventing it from deviating. The pilot hole depth can also be controlled according to the descent length of the pilot hole rod 1, realizing pilot hole drilling according to the required depth. The pilot hole tool has a simple structure and is easy to form. The pilot hole process is easy to operate, improving pilot hole drilling efficiency and reducing pilot hole drilling costs. It is suitable for rapid pilot hole drilling of simple lightweight well points in sandy soil.

[0019] The pilot hole rod 1 is formed by connecting multiple segmented rods 5 sequentially from bottom to top. The uppermost segmented rod 5 is a solid rod or has a sealed top, while the lowermost segmented rod 5 is the longest, with a length of 3-4 meters and an outer diameter not exceeding 25mm. The smaller outer diameter of the segmented rods 5 ensures that the pilot hole rod 1 can be easily inserted into the sand manually. The segmented rods 5 can be formed from DN20 steel pipes, with external or internal threads machined at the ends to allow adjacent segmented rods to connect via threaded engagement. The lowermost segmented rod 5 is the longest to reduce the number of segmented rods required. Figure 2 As shown, there are three segments. The bottom segment 5 is 4 meters long, while the top and second segments are both 3 meters long. This satisfies the requirements for different borehole depths and facilitates connection. The top segment is a solid rod with a sealed top to ensure that the water sprayed from the borehole jet pipe 2 during the borehole process will not overflow from the top of the borehole rod 1, thus ensuring the impact force of the jet pipe 2 on the soil layer and guaranteeing the reliability of the borehole.

[0020] The pilot jet pipe 2 is welded to the lowest segmented rod 5, and the bottom end of the pilot jet pipe 5 is located below the bottom end of the pilot long rod 1. As shown in the attached diagram, the bottom end of the pilot jet pipe 5 is lower than the bottom end of the pilot long rod 1, ensuring that when the pilot long rod 1 is inserted into the sandy soil, the pilot jet pipe 2 will enter the sandy soil layer. After the booster pump 4 is turned on, the pilot jet pipe 2 will powerfully spray the soil layer below to form a hole.

[0021] The pilot jet pipe 2 has a length of 40-60 cm, a wall thickness of 3-4 mm, and an inner diameter of 50±5 mm. The bottom of the pilot jet pipe 2 has a conical tip 21, through which a jetting hole 22 with an inner diameter smaller than that of the pilot jet pipe 2 is formed. The inner diameter of the pilot jet pipe 2 (50±5 mm) is compatible with the inner diameter of a standard flexible hose, facilitating connection with the flexible hose 3. The conical tip 21 accelerates the downward movement of the pilot jet pipe 2 through the soil, and the jetting hole 22 further increases the downward water pressure, improving the pilot jet efficiency.

[0022] The pilot jet pipe 2 has an external threaded interface 23 at its top, and one end of the hose 3 has an internal threaded connector 31 that mates with the external threaded interface 23. The internal threaded connector 31 of the hose 3 is threadedly engaged with the external threaded interface 23 and fastened together, forming a firm connection between the pilot jet pipe 1 and the hose 3. This prevents excessive water pressure inside the hose 3 from causing the hose 3 to loosen from the pilot jet pipe 1, thus improving the structural reliability of the pilot hole tool and enhancing the reliability of the pilot hole.

[0023] The length of the hose 3 is not less than the length of the pilot hole rod 1. During the pilot hole preparation process, the hose 3 will gradually enter the injection hole as the pilot hole injection pipe 2 goes deeper. The length of the hose 3 must be compatible with the length of the pilot hole rod 1 to avoid the pilot hole depth requirement not being met due to insufficient hose 3 length, thereby improving the reliability of the pilot hole preparation.

[0024] The technical solutions of the embodiments of this utility model have been fully described above with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A simple, lightweight wellpoint pilot hole tool for sandy terrain, characterized in that: It includes a pilot hole rod, a pilot hole jet pipe fixed at the bottom of the pilot hole rod, a hose connected to the upper end of the pilot hole jet pipe, and a booster water pump. The outlet end of the booster water pump is connected to the hose. The outer diameter of the pilot hole jet pipe is larger than the outer diameter of the pilot hole rod.

2. The simple lightweight wellpoint pilot hole tool for sandy terrain according to claim 1, characterized in that: The aforementioned pilot hole rod is formed by connecting multiple segmented rods sequentially from bottom to top. The uppermost segmented rod is a solid rod or has its top sealed, while the lowermost segmented rod has the longest length, ranging from 3 to 4 meters, and the outer diameter of the segmented rod does not exceed 25 mm.

3. The simple lightweight wellpoint pilot hole tool for sandy terrain according to claim 2, characterized in that: The pilot nozzle is welded to the lowest segment rod, and the bottom end of the pilot nozzle is located below the bottom end of the pilot rod.

4. The simple lightweight wellpoint pilot hole tool for sandy terrain according to claim 1, characterized in that: The length of the pilot jet pipe is 40~60cm, the wall thickness is 3~4mm, and the inner diameter is 50±5mm. The bottom of the pilot jet pipe has a conical tip, and a jet through hole with an inner diameter smaller than the inner diameter of the pilot jet pipe is opened in the conical tip.

5. The simple lightweight wellpoint pilot hole tool for sandy terrain according to claim 1, characterized in that: The top of the jet pipe has an external threaded interface, and one end of the hose has an internal threaded connector that mates with the external threaded interface.

6. The simple lightweight wellpoint pilot hole tool for sandy terrain according to claim 1, characterized in that: The length of the hose is not less than the length of the pilot hole rod.

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