Miniature steel pipe pile capable of being automatically monitored and construction technology

Abstract

The invention discloses a miniature steel pipe pile capable of achieving automatic monitoring and a construction technology, and relates to the technical field of miniature pile supporting, the miniature steel pipe pile comprises a steel pipe pile body, a pointed cone end is installed at one end of the steel pipe pile body, and a spiral blade is arranged on the outer side of the steel pipe pile body; the tip of the pointed cone is provided with a grout outlet hole and a casing material, and a grouting hole in the steel pipe pile main body is connected with a Laval nozzle; the steel pipe pile body is provided with a plurality of temperature sensors and displacement sensors, the temperature sensors are used for monitoring hydration heat release of cement grout in the grouting process, and the displacement sensors are used for monitoring deformation of the steel pipe pile body. Slurry hardening parameters and displacement deformation of the steel pipe pile can be monitored in real time, the grouting process is precisely controlled, and the service life of the steel pipe pile is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of micro pile support, and in particular to a micro steel pipe pile capable of automatic monitoring and a construction process. Background Art

[0002] Micro steel pipe piles have the advantages of high material strength, strong penetration ability, small soil squeezing effect, light pile driving equipment or drilling equipment, and convenient connection. Therefore, they are widely used in engineering construction and foundation reinforcement. At present, the main construction methods of micro steel pipe piles are hammering, static pressure and pre-drilling and embedding. Each method has corresponding advantages and disadvantages:

[0003] The hammer type uses the impact force of a gravity hammer to drive the steel pipe into the soil layer, which can easily cause damage to the pile body, and the verticality of the pile body is not easy to ensure, and noise will be generated during the construction process. The static pressure type uses external reaction force to press the steel pipe pile into the soil layer. It requires a pile pressure reaction device to be provided on site. The pile pressure efficiency is low when the pile body is long or the pile diameter is large, and it will produce a significant soil squeezing effect, which will have an adverse effect on surrounding pipelines or adjacent buildings, and cannot be applied to hard rock formations. The pre-drilled buried type is to first drill a hole in the soil layer, then place the steel pipe pile and inject slurry into the drill hole. When used in areas with abundant groundwater, it is easy to collapse the hole, affecting the quality of subsequent grouting, and also generating waste slurry to pollute the construction site. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a micro steel pipe pile and construction process that can be automatically monitored, which can monitor the slurry hardening parameters and the displacement and deformation of the steel pipe pile in real time, realize the refined control of the grouting process, and extend the service life of the steel pipe pile.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides a micro steel pipe pile capable of automatic monitoring, comprising a steel pipe pile body, a pointed cone end is installed at one end of the steel pipe pile body, and a spiral blade is provided on the outer side of the steel pipe pile body;

[0007] The pointed cone end is provided with a grouting hole and a casing material, the steel pipe pile body is provided with a grouting hole, and a Laval nozzle is installed at the grouting hole;

[0008] The steel pipe pile body is installed with a plurality of temperature sensors and displacement sensors. The temperature sensor is used to monitor the hydration heat release of cement slurry during the grouting process, and the displacement sensor is used to monitor the deformation of the steel pipe pile body.

[0009] As a further implementation, the axial projection area of ​​the spiral blade is equal to the projection area of ​​the pointed cone end.

[0010] As a further implementation method, the Laval nozzle is arranged perpendicular to the steel pipe pile body, a nozzle protection tube is arranged on the outside of the Laval nozzle, and a sealing cover is installed on the nozzle protection tube.

[0011] As a further implementation, the temperature sensor and the displacement sensor are respectively connected to the data processing and communication module via cables.

[0012] As a further implementation method, during grouting, the cable is fixed to the inner wall of the steel pipe pile body through a U-shaped clamping tube.

[0013] As a further implementation method, during grouting, a grout-stopping plug is built into the steel pipe pile body.

[0014] As a further implementation method, a thread is installed at one end of the steel pipe pile body.

[0015] As a further implementation method, the outer surface of the steel pipe pile body and the spiral blade is sprayed with anti-rust material.

[0016] In a second aspect, an embodiment of the present invention further provides a construction process of a micro steel pipe pile capable of automatic monitoring, comprising:

[0017] After the steel pipe pile body is rotated to the designed depth using the pointed cone end and the spiral blade, a grouting plug is placed inside the steel pipe pile body; a backward grouting method is adopted; during the grouting process, the slurry is sprayed out from the Laval nozzle, and at the same time, the temperature sensor monitors the hydration temperature of the cement slurry. After reaching the set hydration temperature, the grouting plug moves backward; the displacement sensor monitors the displacement deformation of the micro steel pipe pile in real time.

[0018] As a further implementation method, according to the designed depth, the pointed cone end can be connected to multiple steel pipe pile bodies, and adjacent steel pipe pile bodies are connected by threads.

[0019] The beneficial effects of the present invention are as follows:

[0020] (1) The micro steel pipe pile of the present invention is equipped with a pointed cone end and a spiral blade with equal projected areas. The two can cooperate to quickly penetrate the soil and spirally advance. There is no need to drill a hole first and then bury the pipe, which can eliminate the problem of hole collapse in pre-drilled holes. The micro steel pipe pile is installed with a temperature sensor and a displacement sensor. The temperature sensor is used to monitor the hydration heat release of cement slurry in real time. In conjunction with the grouting plug, it can finely control the grouting process of different strata. At the same time, the displacement sensor is used to monitor the deformation of the steel pipe pile body to ensure the construction and service quality of the steel pipe pile.

[0021] (2) The steel pipe pile body of the present invention is equipped with a Laval nozzle, which can significantly increase the injection speed of the slurry under the same grouting pump power, thereby increasing the diffusion distance of the slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 is a front view of a micro steel pipe pile according to one or more embodiments of the present invention;

[0024] Figure 2 is a side view of a micro steel pipe pile according to one or more embodiments of the present invention;

[0025] Figure 3 is a top view of a micro steel pipe pile according to one or more embodiments of the present invention.

[0026] Among them, 1. Conical end, 2. Slurry outlet hole, 3. Shell material, 4. Steel pipe pile body, 5. Spiral blade, 6. Laval nozzle, 7. Nozzle protection tube, 8. Temperature sensor, 9. Displacement sensor, 10. Thread, 11. Cable, 12. Data processing and communication module, 13. U-shaped clamp tube, 14. Sealing cover. DETAILED DESCRIPTION

[0027] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0028] Embodiment 1:

[0029] In order to solve the problems of the existing micro steel pipe pile construction requiring pre-drilling, rough grouting process of steel pipe pile, low slurry injection velocity, easy rust of micro steel pipe, inability to monitor the cement slurry hardening process and displacement deformation of steel pipe in real time, this embodiment provides a micro steel pipe pile that can be automatically monitored, such as Figure 1-Figure 3 As shown, it includes a steel pipe pile body 4, and a thread 10 is installed at one end of the steel pipe pile body 4 to facilitate the connection between the steel pipe pile bodies 4; a pointed cone end 1 is installed at the other end of the steel pipe pile body 4, and the pointed cone end 1 is provided with a slurry outlet hole 2 and a casing material 3. During grouting, the slurry can break through the casing material 3 and flow to the formation.

[0030] A spiral blade 5 is installed outside the steel pipe pile body 4. The spiral blade 5 is arranged axially along the steel pipe pile body 4, one end of which is connected to the edge of the pointed cone end 1, and the axial projection area of ​​the spiral blade 5 is equal to the projection area of ​​the pointed cone end 1. It can quickly penetrate the soil and spirally advance, without the need to first form a hole and then bury the pipe, and can eliminate the problem of drilling and collapsing holes in pre-formed holes. The surface of the steel pipe pile body 4 and the spiral blade 5 are sprayed with anti-rust materials, which can increase the service life of the micro steel pipe pile.

[0031] Grouting holes are provided on the outer wall of the steel pipe pile body 4, and the grouting holes are arranged at different heights. Laval nozzles 6 are installed on the grouting holes on the steel pipe pile body 4, and the Laval nozzles 6 are installed perpendicular to the steel pipe pile body 4. By installing the Laval nozzles 6, the injection speed of the slurry can be significantly increased under the same grouting pump power, thereby increasing the diffusion distance of the slurry.

[0032] like Figure 1 and Figure 3 As shown, a nozzle protection tube 7 is sleeved on the outside of the Laval nozzle 6, one end of the nozzle protection tube 7 is fixed to the steel pipe pile body 4, and the other end is installed with a sealing cap 14. When not in use, the nozzle protection tube 7 and the sealing cap 14 protect the Laval nozzle 6; during grouting, the slurry can flush the sealing cap 14.

[0033] like Figure 2 and Figure 3 As shown, the steel pipe pile body 4 is installed with a temperature sensor 8 and a displacement sensor 9, and multiple sensor installation positions are set along the height direction of the steel pipe pile body 4, and the temperature sensor 8 and the displacement sensor 9 are embedded in the outer wall of the steel pipe pile body 4. The installation positions of the temperature sensor 8 and the displacement sensor 9 are set according to actual conditions, for example, the temperature sensor 8 and the displacement sensor 9 are set in each spiral segment formed by the spiral blade 5.

[0034] The temperature sensor 8 and the displacement sensor 9 are respectively connected to the data processing and communication module 12 through the cable 11. The cable 11 is fixed to the inner wall of the steel pipe pile body 4 through the U-shaped clamp tube 13. The U-shaped clamp tube 13 is a thin tube with a slit on one side and a U-shaped cross section. The cable 11 is confined in the U-shaped groove formed by the U-shaped clamp tube 13, which can prevent the cable 11 from being affected during the grouting process.

[0035] The temperature sensor 8 is used to monitor the hydration heat release of cement slurry during the grouting process, and the displacement sensor 9 is used to monitor the deformation of the micro steel pipe pile during service; the data processing and communication module 12 is used to transmit the monitored temperature signal and displacement signal to a mobile phone or other display device.

[0036] In this embodiment, the temperature sensor 8 and the displacement sensor 9 are wireless sensors; the cable 11 transmits the sensor signal to the communication module, and the communication module directly sends the signal, and the data can be viewed from a mobile phone or other display device.

[0037] The processing process of the micro steel pipe pile in this embodiment is as follows:

[0038] A plurality of slurry outlet holes 2 are opened at the pointed cone end 1 and wrapped with a casing material 3, and the pointed cone end 1 is welded to a steel pipe pile body 4 with a spiral blade 5; a hole is opened at a designed position on the side wall of the steel pipe pile body 4 and a Laval nozzle 6 and a nozzle protection tube 7 are welded, and a sealing cap 14 is inserted into the end of the nozzle protection tube 7 away from the steel pipe pile body 4.

[0039] A U-shaped clamping tube 13 is welded to the inner wall of the steel pipe pile body 4, and a hole is opened at the designed position on the side wall of the steel pipe pile body 4 to install the temperature sensor 8 and the displacement sensor 9. The cable 11 is confined in the space between the U-shaped clamping tube 13 and the steel pipe pile body 4; one end of the cable 11 extending to the outside of the steel pipe pile body 4 is connected to the data processing and communication module 12.

[0040] Anti-rust material is sprayed on the outer surfaces of the steel pipe pile body 4 and the spiral blade 5 .

[0041] This embodiment monitors the hydration heat release of cement slurry through the temperature sensor 8, monitors the hardening process of cement slurry in real time, and combines the grouting plug inserted into the steel pipe pile body 4 to finely control the grouting process of different strata; and monitors the displacement deformation of steel pipe grouting and steel pipe pile service in real time through the displacement sensor 9 to improve construction quality and efficiency.

[0042] Embodiment 2:

[0043] This embodiment provides a construction process of a micro steel pipe pile capable of automatic monitoring, based on the micro steel pipe pile described in Example 1, comprising the following steps:

[0044] Step 1: Connect several steel pipe pile bodies 4 through threads 10 to meet the length of the micro steel pipe pile required by the construction; only the steel pipe pile body 4 at the end is connected to the pointed cone end 1. After the steel pipe pile body 4 rotates and advances to the designed depth with the help of the pointed cone end 1 and the spiral blade 5, a grout stopper is inserted into the steel pipe pile body 4, and backward grouting is performed from the bottom of the steel pipe pile body 4 to the top, so as to perform refined grouting in different stratum parts.

[0045] Step 2: When the grouting plug is grouting a certain part, the slurry is sprayed out from the Laval nozzle 6 and breaks the sealing cover 14 of the nozzle protection tube 7. The temperature sensor 8 at the corresponding position can monitor the hydration reaction and hardening process of the cement slurry. The detection signal of the temperature sensor 8 is transmitted to the data processing and communication module 12, and the data can be directly observed through the mobile phone APP; after the slurry solidifies, a control signal is sent to move the grouting plug backward, and grouting is carried out in the remaining upper target positions in turn.

[0046] In this embodiment, when the temperature sensor 8 detects a temperature range between 50°C and 80°C, a control signal is sent to move the stop plug backward; the specific temperature for controlling the stop plug to move backward is determined by factors such as cement dosage, water-cement ratio, and environmental conditions.

[0047] Step 3: During the grouting process of the steel pipe pile body 4 and the service of the micro steel pipe pile, the horizontal displacement (lateral displacement) and deformation of the micro steel pipe pile are monitored in real time by the displacement sensor 9 .

[0048] When the horizontal displacement deformation exceeds the control value (generally within the range of 5 to 15 mm), the following measures should be taken:

[0049] (1) A waist beam is set at the top of the steel pipe pile or at an appropriate position to connect the steel pipe piles into a whole through the waist beam to jointly resist horizontal forces;

[0050] (2) If the horizontal displacement is caused by excessively fast pile sinking speed, use the skipping method or interval pile sinking to avoid excessive soil squeezing effect caused by concentrated pile sinking;

[0051] (3) For steel pipe piles with large horizontal displacement, the holes are re-drilled (for example, using a geological drill rod with a diameter of 34 mm and a geological drill bit with a diameter of 36 mm). After reaching the position with large horizontal displacement, grouting is performed again (double liquid slurry can be injected), and the surrounding soil is grouted again to strengthen it, improve the shear strength of the soil, and reduce the horizontal displacement of the steel pipe pile.

[0052] The construction process of this embodiment can realize the simultaneous monitoring of cement slurry hardening and steel pipe pile displacement deformation, thereby ensuring the construction efficiency and quality of micro steel pipe piles.

[0053] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A micro steel pipe pile capable of automatic monitoring, characterized in that: It comprises a steel pipe pile body, one end of which is provided with a pointed cone end head, and the outer side of the steel pipe pile body is provided with a spiral blade; The pointed cone end is provided with a grouting hole and a casing material, the steel pipe pile body is provided with a grouting hole, and a Laval nozzle is installed at the grouting hole; The steel pipe pile body is installed with a plurality of temperature sensors and displacement sensors. The temperature sensor is used to monitor the hydration heat release of cement slurry during the grouting process, and the displacement sensor is used to monitor the deformation of the steel pipe pile body.

2. The micro steel pipe pile capable of automatic monitoring according to claim 1, characterized in that: The axial projection area of ​​the spiral blade is equal to the projection area of ​​the pointed cone end.

3. The micro steel pipe pile capable of automatic monitoring according to claim 1, characterized in that: The Laval nozzle is arranged perpendicular to the steel pipe pile body, a nozzle protection tube is arranged outside the Laval nozzle, and a sealing cover is installed on the nozzle protection tube.

4. The micro steel pipe pile capable of automatic monitoring according to claim 1, characterized in that: The temperature sensor and the displacement sensor are respectively connected to the data processing and communication module through cables.

5. The micro steel pipe pile capable of automatic monitoring according to claim 4, characterized in that: During grouting, the cable is fixed to the inner wall of the steel pipe pile body through a U-shaped clamping tube.

6. The micro steel pipe pile capable of automatic monitoring according to claim 1, characterized in that: During grouting, a grout-stopping plug is built into the steel pipe pile body.

7. The micro steel pipe pile capable of automatic monitoring according to claim 1, characterized in that: A thread is installed at one end of the steel pipe pile body.

8. The micro steel pipe pile capable of automatic monitoring according to claim 1 or 2, characterized in that: The outer surfaces of the steel pipe pile body and the spiral blade are sprayed with anti-rust material.

9. A construction process for a micro steel pipe pile capable of automatic monitoring according to any one of claims 1 to 8, characterized in that: include: After the steel pipe pile body is rotated to the designed depth by using the pointed cone end and the spiral blade, a grout stopper is placed inside the steel pipe pile body; A backward grouting method is adopted; during the grouting process, the slurry is sprayed out from the Laval nozzle, and the temperature sensor monitors the hydration temperature of the cement slurry. After reaching the set hydration temperature, the slurry stopper moves backward; the displacement sensor monitors the displacement deformation of the micro steel pipe pile in real time.

10. The construction process of a micro steel pipe pile capable of automatic monitoring according to claim 9, characterized in that: According to the designed depth, the pointed cone end can be connected to multiple steel pipe pile bodies, and adjacent steel pipe pile bodies are connected by threads.

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