A well point pipe capable of monitoring foundation bearing capacity and its construction method

Abstract

The present invention belongs to the technical field of foundation dewatering, and specifically discloses a well point pipe capable of monitoring the bearing capacity of the foundation and its construction method, which includes an outer layer pipe, a cover plate and an electromagnet. The top of the outer layer pipe is connected to the cover plate in a matching manner, and the electromagnet is arranged on the central axis inside the outer layer pipe; multiple rows of transverse through holes are arranged axially on the barrel wall of the outer layer pipe; a separable magnetic cylinder is arranged between the electromagnet and the outer layer pipe; a drain port is arranged on the cover plate, and a water seepage pipe corresponding to the transverse through holes is arranged on the separable magnetic cylinder. The electromagnet is connected to a power supply. When the electromagnet is energized, the separable magnetic cylinder approaches the electromagnet due to the attraction of the electromagnet; when the electromagnet is powered off, the separable magnetic cylinder moves away from the electromagnet, and the water seepage pipe extends out of the outside of the outer layer pipe through the transverse through holes. The present invention expands the dewatering range of the well point pipe and reduces the usage amount of the well point pipe; at the same time, it can monitor the bearing capacity of the foundation at different depths in real time, which is of great significance for the evaluation of the foundation stability and safety.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation dewatering, and particularly relates to a well point pipe capable of monitoring the bearing capacity of the foundation and a construction method thereof. Background Art

[0002] The well point dewatering method is a commonly used dewatering method in foundation treatment. That is, a certain number of well point pipes are buried around the soil body to be dewatered, and redundant water in the soil body is discharged through pumping equipment and vacuum pumps and other devices, accelerating the consolidation process of the soil body and improving the bearing capacity of the soil body. The bearing capacity of the foundation is a key index to measure the stability of the foundation and the safety of the project. Insufficient bearing capacity of the foundation will cause major accidents such as foundation pit collapse and building collapse. Therefore, it is particularly important to obtain the bearing capacity of the foundation before and after dewatering for evaluating the stability and safety of the foundation.

[0003] In addition, most of the existing well water pipes for dewatering are provided with water inlet holes on the pipe wall. The dewatering range of each well point pipe is limited to a certain range around the well point pipe. For large-scale foundation construction projects, a large number of well point pipes need to be buried for foundation dewatering, which requires a large amount of manpower and material resources. Therefore, how to improve the dewatering range of the well point pipe is crucial for improving the dewatering efficiency and construction cost of the foundation dewatering project. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a well point pipe capable of monitoring the bearing capacity of the foundation and a construction method thereof, which expands the dewatering range of the well point pipe and greatly reduces the amount of well point pipes used in the foundation dewatering process. At the same time, it can monitor the bearing capacity of the foundation at different depths in real time, which is of great significance for evaluating the stability and safety of the foundation after dewatering and improving the safety of foundation dewatering.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions.

[0006] (1) A well point pipe capable of monitoring the bearing capacity of the foundation, comprising an outer layer pipe, a cover plate and an electromagnet. The top end of the outer layer pipe is connected with the cover plate in a matching manner. The electromagnet is arranged on the central axis inside the outer layer pipe, its top end is connected with the cover plate, and the bottom end is higher than the bottom end of the outer layer pipe. A plurality of rows of transverse through holes are arranged axially on the barrel wall of the outer layer pipe. A separable magnetic cylinder is also arranged between the electromagnet and the outer layer pipe. A drain port is arranged on the cover plate, and a drain pipe is arranged between the outer layer pipe and the separable magnetic cylinder. One end of the drain pipe is located on the bottom plate of the outer layer pipe, and the other end extends out of the well point pipe through the drain port.

[0007] A water seepage pipe corresponding to the transverse through hole is arranged on the separable magnetic cylinder. The electromagnet is connected to a power supply. When the electromagnet is energized, the separable magnetic cylinder approaches the electromagnet due to the attraction of the electromagnet. When the electromagnet is de-energized, the separable magnetic cylinder moves away from the electromagnet, and the water seepage pipe extends out of the outer pipe through the transverse through hole.

[0008] The features and further improvements of the technical solution of the present invention are as follows:

[0009] Further, the separable magnetic cylinder is composed of a plurality of arc-shaped plates. Each arc-shaped plate is connected to the electromagnet through a spring, and a water seepage pipe is arranged on each arc-shaped plate. When the electromagnet is energized, the electromagnet attracts the plurality of arc-shaped plates to approach each other, the spring is compressed, and the water seepage pipe is located inside the outer pipe. When the electromagnet is de-energized, the spring is in a free state, the plurality of arc-shaped plates are separated from each other, and the water seepage pipe extends out of the transverse through hole.

[0010] Even further, a pressure sensor is arranged on the water seepage pipe.

[0011] Further, the water seepage pipe is in the shape of a needle tube, and the pressure sensor is located at the front end of the needle-tube-shaped water seepage pipe.

[0012] Even further, a plurality of water seepage holes are arranged on the water seepage pipe, and multiple layers of filter cotton nets are sleeved outside the water seepage pipe.

[0013] Further, an air extraction hole is also arranged on the cover plate.

[0014] Further, a slide rail corresponding to the top end of the arc-shaped plate is arranged on the bottom surface of the cover plate, so that each arc-shaped plate moves in the slide rail.

[0015] Further, a water pump is connected to the drainage end of the drain pipe.

[0016] Further, a sealing ring is arranged at the connection between the cover plate and the outer pipe.

[0017] (2) A construction method of a well point pipe capable of monitoring the foundation bearing capacity includes the following steps:

[0018] Step 1: Drill a soil hole at the construction site. Energize the electromagnet, and the separable magnetic cylinder approaches the electromagnet due to the attraction of the electromagnet. The water seepage pipe retracts into the inner part of the outer pipe, and the well point pipe is buried in the soil hole.

[0019] Step 2: De-energize the electromagnet, the separable magnetic cylinder moves away from the electromagnet, and the water seepage pipe extends out of the outer pipe through the transverse through hole and inserts into the soil.

[0020] Step 3: Exhaust and drain the soil corresponding to the well point pipes in sequence until the drainage volume remains less than the threshold for a period of time, completing the soil dewatering of the construction site to be; meanwhile, the pressure sensors monitor the soil pressure at each depth in real time.

[0021] Further, the exhausting and draining of the soil corresponding to the well point pipes in sequence is specifically as follows: Connect a vacuum pump through the air extraction holes to exhaust the gas in the soil, making the soil around the well point pipes in a negative pressure state. Then, the water in the soil enters the permeable pipe through the water seepage holes and flows into the outer layer pipe, and a water pump is used to drain the water in the outer layer pipe through the drain pipe.

[0022] Further, after the soil dewatering is completed, energize the electromagnet, and the separable magnetic cylinder approaches the electromagnet due to the attraction of the electromagnet, the permeable pipe shrinks into the inner part of the outer layer pipe, and then the well point pipe can be taken out.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] (1) Through the ingenious structural design, the present invention expands the dewatering area under the jurisdiction of a single well point pipe, can reduce the number of well pipes in the project, and lower the construction cost; meanwhile, through the pressure sensors, the foundation bearing capacity can be effectively monitored, providing a scientific and effective reference for the analysis of the foundation stability and safety.

[0025] (2) The construction method of the present invention realizes the dewatering of a larger area of soil without changing the original drilling and the volume of the well point pipes, that is, without changing the construction difficulty and intensity while increasing the dewatering area, and reducing the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following further describes the present invention in detail with reference to the drawings and specific embodiments.

[0027] Figure 1 It is a vertical sectional view of a well point pipe with the function of monitoring the foundation bearing capacity according to the present invention;

[0028] Figure 2 It is a horizontal sectional view of a well point pipe with the function of monitoring the foundation bearing capacity according to the present invention;

[0029] Figure 3 It is a schematic view of the outer layer pipe of the well pipe according to the present invention;

[0030] Figure 4 It is a bottom view of the cover plate according to the present invention;

[0031] In the above figures, 1 is the outer layer pipe; 101 is the horizontal through hole; 2 is the cover plate; 201 is the drain port; 202 is the air extraction port; 203 is the slide rail; 3 is the electromagnet; 4 is the separable magnetic cylinder; 401 is the arc-shaped plate; 5 is the drain pipe; 6 is the permeable pipe; 601 is the water seepage hole; 7 is the pressure sensor; 8 is the spring. Specific implementation mode

[0032] The following will describe the implementation scheme of the present invention in detail in combination with embodiments. However, those skilled in the art will understand that the following embodiments are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention.

[0033] Embodiment 1

[0034] Reference Figures 1-3 , the present invention provides a well point pipe capable of monitoring the bearing capacity of the foundation, including an outer layer pipe 1, a cover plate 2 and an electromagnet 3. The top end of the outer layer pipe 1 is connected to the cover plate 2 in a matching manner. The electromagnet 3 is arranged on the central axis inside the outer layer pipe 1, its top end is connected to the cover plate 2, and the bottom end is higher than the bottom end of the outer layer pipe 1. A plurality of rows of transverse through holes 101 are arranged axially on the barrel wall of the outer layer pipe 1. A separable magnetic cylinder 4 is further arranged between the electromagnet 3 and the outer layer pipe 1. A drain port 201 is arranged on the cover plate 2. A drain pipe 5 is arranged between the outer layer pipe 1 and the separable magnetic cylinder 4. One end of the drain pipe 5 is located on the bottom plate of the outer layer pipe 1, and the other end extends out of the well point pipe through the drain port 201. A water seepage pipe 6 corresponding to the transverse through holes 101 is arranged on the separable magnetic cylinder 4. The electromagnet 3 is connected to a power supply. When the electromagnet 3 is energized, the separable magnetic cylinder 4 approaches the electromagnet 3 by the attraction of the electromagnet 3. When the electromagnet 3 is powered off, the separable magnetic cylinder 4 moves away from the electromagnet 3, and the water seepage pipe 6 extends out of the outer side of the outer layer pipe 1 through the transverse through holes 101.

[0035] In the above embodiments, after selecting the construction site, dewatering is carried out on the construction site; first, drill holes in the soil, and bury the well point pipe of the present invention at the drilled holes. Before burying, the electromagnet 3 is energized, and the separable magnetic cylinder 4 approaches the electromagnet 3 by the attraction of the electromagnet 3, and the water seepage pipe 6 thereon retracts into the inner side of the outer layer pipe 1, and then the well point pipe can be placed into the drilled holes. The electromagnet 3 in the present invention is columnar and is located on the central axis of the outer layer pipe 1, and is fixed in position by connecting with the cover plate 2; the cover plate 2 has an annular groove, and the annular groove matches the upper end of the outer layer pipe 1 to make the two closely connected; the separable magnetic cylinder 4 is arranged between the outer layer pipe 1 and the electromagnet 3, and can be regarded as the inner cylinder of the well point pipe, specifically an iron cylinder, and is connected with the electromagnet 3 through a spring, and approaches the electromagnet 3 by the attraction of the electromagnet 3, so that the water seepage pipe 6 on the separable magnetic cylinder 4 retracts into the outer layer pipe 1. When burying and removing the well point pipe, the water seepage pipe 6 is in a retracted state. During the dewatering process, the power supply of the electromagnet 3 is disconnected, the attraction between the separable magnetic cylinder 4 and the electromagnet 3 disappears, the separable magnetic cylinder 4 moves away from the electromagnet 3, so that the water seepage pipe 6 thereon extends out into the soil outside the outer layer pipe 1 through the transverse through hole 101, and then the other and water in the soil are discharged through a vacuum pump and a water pump to realize the dewatering of the soil. The water seepage pipe 6 in the present invention extends out of the outer side of the outer layer pipe 1, expanding the dewatering range of a single well point pipe, reducing the number of well pipes in the project, and lowering the construction cost.

[0036] Reference Figure 2 , according to an embodiment of the present invention, the separable magnetic cylinder 4 is composed of a plurality of arc-shaped plates 401, each arc-shaped plate 401 is connected with the electromagnet 3 through a spring 8, and a water seepage pipe 6 is arranged on each arc-shaped plate 401; when the electromagnet 3 is energized, the electromagnet 3 attracts the plurality of arc-shaped plates 401 to approach each other, the spring 8 is compressed, and the water seepage pipe 6 is located inside the outer layer pipe 1; when the electromagnet 3 is de-energized, the spring 8 is in a free state, the plurality of arc-shaped plates 401 are separated from each other, and the water seepage pipe 6 extends out of the transverse through hole 101.

[0037] In the above embodiments, the separable magnetic cylinder 4 is composed of a plurality of arc-shaped plates 401, each arc-shaped plate 401 is connected with the electromagnet 3 through a spring 8, when the electromagnet 3 is energized, the electromagnet 3 attracts the plurality of arc-shaped plates 401 to approach each other to form a cylinder, the spring 8 is compressed, and the water seepage pipe 6 on each arc-shaped plate 401 retracts into the inner side of the outer layer pipe 1, which is convenient for the placement and removal of the well point pipe. When the electromagnet 3 is de-energized, the spring 8 is in a free state, the plurality of arc-shaped plates 401 are separated from each other, and the water seepage pipe 6 extends out of the transverse through hole 101 to expand the dewatering area.

[0038] Reference Figure 1 and Figure 2 , according to an embodiment of the present invention, a pressure sensor 7 is arranged on the water seepage pipe 6.

[0039] In the above embodiments, multiple rows of water seepage pipes 6 are arranged along the axial direction of the separable magnetic cylinder 4, and each row is arranged along the axial direction of the separable magnetic cylinder 4. A pressure sensor 7 is provided on each water seepage pipe 6. The multiple circumferentially arranged pressure sensors 7 can measure the soil pressure in different directions at the same depth, improving the test accuracy; the axially arranged pressure sensors 7 can compare the soil pressures at different depths, which is of great significance for evaluating the overall bearing capacity of the soil.

[0040] Reference Figure 1 and Figure 2 , according to an embodiment of the present invention, the water seepage pipe 6 is a needle-shaped tube, and the pressure sensor 7 is located at the front end of the needle-shaped water seepage pipe 6, reducing the resistance when the water seepage pipe 6 is inserted into the soil. In addition, in order to ensure smooth water flow, the diameter of the needle tube is 10 mm. To expand the drainage area under the jurisdiction of the well point tube, the length of the needle tube is 50 mm. The length of the needle tube should not be too long to prevent the needle tube from being bent and damaged due to excessive soil pressure.

[0041] Reference Figure 1 and Figure 2 , according to an embodiment of the present invention, a plurality of water seepage holes 601 are provided on the water seepage pipe 6, and multiple layers of filter cotton nets are sleeved outside the water seepage pipe 6.

[0042] In the above embodiments, the water in the soil can enter the water seepage pipe 6 through the water seepage holes 601 and then flow into the inner side of the separable iron cylinder, and finally fall into the outer layer pipe 1. To prevent impurities from blocking the water seepage holes 601 of the water seepage pipe 6, three layers of filter cotton nets are wrapped outside the water seepage pipe 6.

[0043] Reference Figure 4 , according to an embodiment of the present invention, an air extraction hole 202 is further provided on the cover plate 2 for connecting an air extraction pipe to a vacuum pump to exhaust the soil.

[0044] Reference Figure 4 , according to an embodiment of the present invention, a slide rail 203 corresponding to the top end of the arc-shaped plate 401 is provided on the bottom surface of the cover plate 2, so that each arc-shaped plate 401 moves on the slide rail 203.

[0045] In the above embodiments, a plurality of fan-shaped slide rails 203 corresponding to the top ends of the arc-shaped plates 401 are provided on the bottom surface of the cover plate 2. When the arc-shaped plates 401 approach or move away from the electromagnet 3, they move along the slide rails 203 to achieve positioning movement and prevent the arc-shaped plates 401 from being skewed.

[0046] Reference Figure 1 , according to an embodiment of the present invention, a water pump is connected to the drainage end of the drainage pipe 5 for draining the soil. The water in the soil falls into the outer layer pipe 1 and can be pumped out through the drainage pipe 5. The drainage pipe 5 is a rubber hose with a diameter of 50 mm.

[0047] Reference Figure 1 According to an embodiment of the present invention, a sealing ring is provided at the connection between the cover plate 2 and the outer layer pipe 1 to ensure the sealing performance between the cover plate 2 and the outer layer pipe 1 and improve the efficiency of exhaust and drainage.

[0048] In the present invention, both the pressure sensor 7 and the electromagnet 3 are respectively connected to a computer and a power supply on the ground through wires.

[0049] Embodiment 2

[0050] A construction method of a well point pipe capable of monitoring the bearing capacity of the foundation includes the following steps:

[0051] Step 1: Drill a soil hole at the construction site to be constructed; energize the electromagnet 3, and the separable magnetic cylinder 4 approaches the electromagnet 3 due to the attraction of the electromagnet 3, and the water seepage pipe 6 retracts into the inner part of the outer layer pipe 1, and the well point pipe is buried in the soil hole.

[0052] Step 2: Cut off the power supply of the electromagnet 3, and the separable magnetic cylinder 4 moves away from the electromagnet 3, and the water seepage pipe 6 extends out of the outer side of the outer layer pipe 1 through the horizontal through hole 101 and is inserted into the soil.

[0053] Step 3: Exhaust and drain the soil corresponding to the well point pipe in sequence until the drainage volume is continuously less than the threshold for a period of time, and complete the soil dewatering of the construction site to be constructed; meanwhile, the pressure sensor 7 monitors the soil pressure at each depth in real time.

[0054] Exhaust and drain the soil corresponding to the well point pipe in sequence, specifically: connect a vacuum pump through the air extraction hole 202 to discharge the gas in the soil, so that the soil around the well point pipe is in a negative pressure state, and then the water in the soil can enter the water seepage pipe 6 through the water seepage hole 601 and flow into the inner part of the outer layer pipe 1, and use a water pump to discharge the water in the outer layer pipe 1 through the drain pipe 5. In the present invention, after the soil dewatering is completed, energize the electromagnet 3, and the separable magnetic cylinder 4 approaches the electromagnet 3 due to the attraction of the electromagnet 3, and the water seepage pipe 6 retracts into the inner part of the outer layer pipe 1, and then the well point pipe can be taken out.

[0055] By designing the structure of the well point pipe, the present invention expands the dewatering range of the well point pipe and greatly reduces the amount of well point pipes used in the foundation dewatering process; on the basis of this structure, the bearing capacity of the foundation at different depths can be monitored in real time, which is of great significance for the evaluation of the stability and safety of the foundation after dewatering and improves the safety of foundation dewatering.

[0056] Although the present invention has been described in detail with general descriptions and specific embodiments in this specification, modifications or improvements can be made to it based on the present invention, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A well point pipe for monitoring the bearing capacity of foundation, characterized in that: It includes an outer tube, a cover plate and an electromagnet. The top of the outer tube is matched and connected with the cover plate. The electromagnet is arranged on the central axis inside the outer tube, and its top is connected with the cover plate, and its bottom is higher than the bottom of the outer tube. The outer tube wall is provided with multiple rows of transverse through holes along the axial direction. A separate magnetic cylinder is also provided between the electromagnet and the outer tube. A drainage port is provided on the cover plate, and a drainage pipe is provided between the outer tube and the separate magnetic cylinder. One end of the drainage pipe is located on the bottom plate of the outer tube, and the other end extends out of the well point pipe through the drainage port. The separate magnetic cylinder is provided with a water seepage pipe corresponding to the transverse through hole, and the electromagnet is connected to a power source. When the electromagnet is powered on, the separate magnetic cylinder approaches the electromagnet by the attraction of the electromagnet; when the electromagnet is powered off, the separate magnetic cylinder moves away from the electromagnet, and the water seepage pipe extends out of the outer layer tube through the transverse through hole. The separate magnetic cylinder is composed of a plurality of arc plates, each of which is connected to an electromagnet through a spring, and a water seepage pipe is arranged on each arc plate; when the electromagnet is powered on, the electromagnet attracts the plurality of arc plates to move closer to each other, the spring is compressed, and the water seepage pipe is located on the inner side of the outer tube; when the electromagnet is powered off, the spring is in a free state, the plurality of arc plates are separated from each other, and the water seepage pipe extends out of the transverse through hole; A pressure sensor is provided on the seepage pipe; The water seepage pipe is in the shape of a needle tube, and the pressure sensor is located at the front end of the needle tube-shaped water seepage pipe; an air extraction hole is also arranged on the cover plate.

2. The well point pipe with the function of monitoring the foundation bearing capacity according to claim 1, characterized in that The seepage pipe is provided with a plurality of seepage holes, and the outer jacket of the seepage pipe is provided with a plurality of layers of filter cotton nets.

3. A well point pipe capable of monitoring the bearing capacity of the foundation according to claim 2, characterized in that A slide rail corresponding to the top of the arc-shaped plate is arranged on the bottom surface of the cover plate, so that each arc-shaped plate moves in the slide rail.

4. A construction method of a well point pipe with the function of monitoring the foundation bearing capacity according to any one of claims 1 to 3, characterized in that, The following steps are involved: Step 1, drilling a hole in the soil at the construction site; energizing the electromagnet, the separate magnetic cylinder approaches the electromagnet by the attraction of the electromagnet, the seepage pipe is retracted into the inner part of the outer layer pipe, and the well point pipe is buried in the soil hole; Step 2, the electromagnet is powered off, the separate magnetic cylinder is away from the electromagnet, and the seepage pipe extends out of the outer layer pipe through the transverse through hole and is inserted into the soil; Step 3, exhaust and drain the soil corresponding to the well point pipe in turn until the drainage volume is less than the threshold for a period of time, completing the soil precipitation of the construction site; at the same time, the pressure sensor monitors the soil pressure at each depth in real time.

5. The construction method of the well point pipe with the function of monitoring the foundation bearing capacity according to claim 4, characterized in that, The soil corresponding to the well-point pipe is vented and drained in turn, specifically: the gas in the soil is discharged by connecting a vacuum pump through the exhaust hole, so that the soil around the well-point pipe is in a negative pressure state, and then the water in the soil enters the seepage pipe through the seepage hole and flows into the outer pipe, and the water in the outer pipe is discharged through the drainage pipe by using a water pump.

6. The construction method of the well point pipe with the function of monitoring the bearing capacity of the foundation soil according to claim 4, characterized in that, After the soil dewatering is completed, the electromagnet is energized, the separate magnetic cylinder is brought close to the electromagnet by the attraction of the electromagnet, the seepage pipe is retracted into the outer pipe, and the well point pipe is taken out.

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