An advance warning device for stratum in pile sinking construction

Abstract

A stratum advance warning device for pile driving construction includes a stratum detection component, a wireless signal transmitting component, a wireless signal receiving component and a data processing component. The stratum detection component includes a cone tip probe, a side wall friction cylinder, a cone tip pressure measuring unit, a side wall pressure measuring unit, a pore pressure measuring unit, a depth measuring unit and a fixing device. The side wall friction cylinder connects the lower cone tip probe and the upper fixing device; the cone tip pressure measuring unit, the side wall pressure measuring unit and the pore pressure measuring unit are all installed in the side wall friction cylinder, the depth measuring unit is installed in the cone tip pressure measuring unit, the fixing device is installed on the pile shoe, the wireless signal transmitting component is connected to the fixing device of the stratum detection component as a whole, and the wireless signal receiving component is arranged inside the pile wall of the prefabricated pipe pile. The present invention monitors the stratum under the pile in real time during the pile driving construction process, and gives an early warning when approaching a sudden change in the stratum or approaching an existing underground building, thereby greatly improving the construction safety.

Description

Technical Field

[0001] The invention belongs to the field of stratum detection in the process of pile driving engineering construction, and in particular relates to an advance warning device for stratum in pile driving construction. Background Art

[0002] At present, the stratum exploration of pile driving construction mainly relies on the point-to-surface analysis of the stratum in the early survey stage, and it is impossible to accurately and real-timely detect the stratum, which leads to various problems often encountered during construction, which is very easy to cause construction accidents. For example, when the pipe pile suddenly enters the hard soil layer from the soft soil layer or encounters the old foundation, large isolated rocks, existing underground buildings (structures) such as tunnels and pipelines in the shallow part, or directly enters the hard soil layer without passing through the transition layer, the pile driver oil pressure rises rapidly, and the pile body is subjected to the instantaneous impact force, causing the pile top to crack and become unusable, or the pile body tilts due to reasons such as non-standard construction, destroying the complex and fragile underground pipe network. Therefore, it is very important to detect the underground situation in real time during the pile driving construction.

[0003] At present, the underground detection means for pile driving construction are generally various preliminary survey methods, mainly including static sounding, dynamic sounding, load test and other in-situ testing methods, drilling coring method, geophysical exploration method, etc., all of which are unable to conduct real-time detection of the stratum directly below the pile body during pile driving construction.

[0004] However, on-site monitoring methods during pile driving construction generally only monitor ground contents such as construction, quality and instrument parameters, and are unable to monitor the characteristics of the stratum directly below the pile body during construction. Summary of the invention

[0005] The technical problem to be solved by the present invention is, in view of the above-mentioned deficiencies in the prior art, to provide an advance warning device for the stratum under the pile during the pile driving construction, which can monitor the stratum under the pile in real time during the pile driving construction, and combine with the previous survey data to give an early warning when approaching a sudden change in the stratum (such as boulders, caves, etc.) or approaching an existing underground building (structure) (such as tunnels, pipelines, etc.), thereby improving the deficiency of being unable to perform real-time monitoring and early warning of the sudden change in the lower stratum during the pile driving construction.

[0006] The technical solution adopted by the present invention to solve the above technical problems is:

[0007] A stratum advance warning device for pile driving construction, comprising a stratum detection component, a wireless signal transmitting component, a wireless signal receiving component and a data processing component, wherein the stratum detection component comprises a cone tip probe, a side wall friction cylinder, a cone tip pressure measuring unit, a side wall pressure measuring unit, a pore pressure measuring unit, a depth measuring unit and a fixing device, wherein the side wall friction cylinder connects the lower cone tip probe and the upper fixing device; a sealing device is provided at the connection between the cone tip probe and the side wall friction cylinder, and between the side wall friction cylinder and the fixing device (the side wall friction cylinder, the cone tip probe, the fixing device and the sealing device together constitute the outer shell of the stratum detection component); the cone tip pressure measuring unit, the side wall pressure measuring unit, the pore pressure measuring unit, the depth measuring unit and the fixing device are connected to the cone tip probe and the side wall friction cylinder, and the connection between the side wall friction cylinder and the fixing device. The units are all installed in the side wall friction cylinder, the depth measuring unit is installed in the cone tip pressure measuring unit, the cone tip probe and the cone tip pressure measuring unit, the cone tip probe and the pore pressure measuring unit, and the cone tip pressure measuring unit and the fixing device are all spliced ​​by threads; the fixing device is installed on the pile shoe, the wireless signal transmitting component is connected to the fixing device of the formation detection component as a whole, the wireless signal receiving component is arranged inside the pile wall of the prefabricated pipe pile, the wireless signal transmitting component is used to convert the voltage signal of the formation data detected by the formation detection component into an electromagnetic wave signal, and send it to the wireless signal receiving component; the data processing component is connected to the wireless signal receiving component.

[0008] According to the above scheme, the cone tip probe and the side wall friction tube exceed the pile shoe by a certain height (can withstand higher pressure).

[0009] According to the above solution, a waterproof structure is also provided on the sealing device (to prevent the instrument from being damaged by water).

[0010] According to the above scheme, the wireless signal transmitting component includes a power supply, a data conversion unit and a wireless signal transmitting unit, the power supply is used to power the cone tip pressure measuring unit, the side wall pressure measuring unit, the pore pressure measuring unit, the depth measuring unit and the wireless signal transmitting unit and the data conversion unit; the cone tip pressure measuring unit, the side wall pressure measuring unit, the pore pressure measuring unit and the depth measuring unit are electrically connected to the data conversion unit of the wireless signal transmitting component through a circular connector; the data conversion unit is electrically connected to the wireless signal transmitting unit through a wire; the cone tip pressure measuring unit, the side wall pressure measuring unit, the pore pressure measuring unit and the depth measuring unit of the formation detection component are respectively used to detect the continuous cone tip pressure, side wall friction resistance, pore water pressure and depth data of the formation; the data conversion unit is used to convert the cone tip pressure, side wall friction resistance, pore water pressure and depth data into voltage signals, and transmit them to the wireless signal transmitting component.

[0011] According to the above scheme, the wireless signal receiving component includes several wireless signal amplifiers and a wireless signal receiving unit. The wireless signal transmitting unit and the first wireless signal amplifier, each wireless signal amplifier, and the last wireless signal amplifier and the wireless signal receiving unit are wirelessly connected via electromagnetic waves.

[0012] According to the above scheme, the data processing component includes a signal acquisition instrument and a data analysis unit. The wireless signal receiving unit and the signal acquisition instrument, as well as the signal acquisition instrument and the data analysis unit are electrically connected through wires. The signal acquisition instrument is used to filter and decode the signal collected by the wireless signal receiving unit, obtain measurement data, and output data curves to the data analysis unit.

[0013] According to the above solution, the wireless signal amplifier has a built-in power supply (no external power supply is required).

[0014] According to the above scheme, the arrangement interval of the wireless signal amplifier is determined according to the signal amplifier specifications and the actual construction situation (so that the amplified signal is sent to the wireless signal receiving unit, so that it can obtain a stable and continuous electromagnetic wave signal).

[0015] The working principle of the present invention is as follows: during pile driving construction, the formation detection component and the wireless signal transmitting component are installed on the pile shoe, the cone tip pressure measuring unit, the side wall pressure measuring unit, the pore pressure measuring unit, and the depth measuring unit use the electric energy in the power supply to detect the formation data, and the voltage signal is transmitted to the data conversion unit through the circular connector socket and the circular connector plug, and after being converted into an electromagnetic wave signal, the signal is sent toward the ground; the wireless signal is amplified by a number of wireless signal amplifiers and then transmitted to the signal receiving unit, and then the signal data is transmitted to the signal acquisition instrument through a wire; the signal acquisition instrument filters and decodes the signal, obtains the measurement data, and outputs the data curve to the data analysis unit. The data analysis unit combines the preliminary survey data with the data obtained by the signal acquisition instrument to more accurately and detailedly analyze the formation data of a certain distance below the current pile body, and gives a reminder when the formation is about to change or issues an alarm when an abnormal formation is about to be encountered.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. During pile driving construction, the present invention can be used to survey the ground conditions under the pile driving in real time, and the ground conditions can be understood in more detail and accurately in combination with the previous survey data, which makes up for the deficiency of the prior art that the ground conditions can only be surveyed by the method of using the previous survey means to survey the ground from point to surface;

[0018] 2. During pile driving construction, the present invention can detect stratum changes in advance, and can especially issue early warnings when approaching stratum mutations (such as boulders, caves, etc.) or existing underground buildings (structures) (such as tunnels, pipelines, etc.), so as to prevent damage to the pile body or underground pipe networks, etc., overcoming the deficiency of the prior art that problems can only be discovered after construction, and improving the real-time monitoring and early warning of lower stratum mutations during pile driving construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a stratum advance warning device for pile sinking construction according to the present invention;

[0020] Figure 2 It is a schematic diagram of a stratum detection component of a stratum advance warning device for pile sinking construction according to the present invention;

[0021] Figure 3 It is a schematic diagram of a wireless signal transmitting component of a stratum advance warning device for pile sinking construction according to the present invention;

[0022] In the figure: 1-formation detection component, 11-cone tip probe, 12-side wall friction cylinder, 13-cone tip pressure measuring unit, 14-side wall pressure measuring unit, 15-pore pressure measuring unit, 16-depth measuring unit, 17-circular connector socket, 18-fixing device, 2-wireless signal transmitting component, 21-power supply, 22-data conversion unit, 23-wireless signal transmitting unit, 24-circular connector plug, 3-wireless signal receiving component, 31-wireless signal amplifier, 32-wireless signal receiving unit, 4-data processing component, 41-signal acquisition instrument, 42-data analysis unit, 5-pile shoe, 6-prefabricated pipe pile. DETAILED DESCRIPTION

[0023] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 1-2 As shown, the pile driving construction stratum advance warning device described in the present invention includes four parts: a stratum detection component 1, a wireless signal transmitting component 2, a wireless signal receiving component 3, and a data processing component 4.

[0025] The formation detection component 1 includes a cone tip probe 11, a side wall friction cylinder 12, a cone tip pressure measuring unit 13, a side wall pressure measuring unit 14, a pore pressure measuring unit 15, a depth measuring unit 16, a circular connector socket 17 and a fixing device 18. The side wall friction cylinder 12 connects the lower cone tip probe 11 and the upper fixing device 18. The connection between the cone tip probe 11, the side wall friction cylinder 12, the fixing device 18 and the circular connector socket 17 is provided with a sealing device, which constitutes the outer shell of the formation detection component 1; the cone tip pressure measuring unit 13, the side wall pressure measuring unit 14, the pore pressure measuring unit 15, the depth measuring unit 16, the circular connector socket 17 and the fixing device 18. The cone tip probe 11 and the cone tip pressure measuring unit 13, the cone tip probe 11 and the pore pressure measuring unit 15, and the cone tip pressure measuring unit 13 and the fixing device 18 are all connected by threads; the circular connector socket 17 is installed in the fixing device 18; the fixing device 18 is fixed on the pile shoe 5; the cone tip pressure measuring unit 13, the side wall pressure measuring unit 14, the pore pressure measuring unit 15, and the depth measuring unit 16 are electrically connected to the circular connector socket 17 through wires;

[0026] The cone tip probe 11 and the side wall friction tube 12 are beyond the pile shoe 5 by a certain height and can withstand higher pressure. The sealing device is also provided with a waterproof structure to prevent the instrument from being damaged by water.

[0027] like Figure 3 As shown, the wireless signal transmitting component 2 is connected to the fixing device 18 of the formation detection component 1 as a whole, including a power supply 21, a data conversion unit 22, a wireless signal transmitting unit 23 and a circular connector plug 24, the circular connector plug 24 is installed on the circular connector socket 17 and realizes electrical connection; the power supply 21 is used to pass electric energy through the circular connector plug 24 and the circular connector socket 17 to power the cone tip pressure measuring unit 13, the side wall pressure measuring unit 14, the pore pressure measuring unit 15, and the depth measuring unit 16; the power supply 21 supplies power to the data conversion unit 22 and the wireless signal transmitting unit 23 through a wire; the circular connector plug 24 is electrically connected to the data conversion unit 22 through a wire; the data conversion unit 22 is electrically connected to the wireless signal transmitting unit 23 through a wire; the wireless signal transmitting component 2 is used to convert the voltage signal of the formation data detected by the formation detection component 1 into an electromagnetic wave signal, and send it to the wireless signal receiving component 3.

[0028] The wireless signal receiving component 3 is arranged inside the pile wall of the prefabricated pipe pile 6, and includes a plurality of wireless signal amplifiers 31 and a wireless signal receiving unit 32. The wireless signal transmitting unit 23 and the first wireless signal amplifier 31, the wireless signal amplifiers 31, and the last wireless signal amplifier 31 and the wireless signal receiving unit 32 are wirelessly connected via electromagnetic waves.

[0029] The data processing component 4 includes a signal acquisition instrument 41 and a data analysis unit 42. The wireless signal receiving unit 32 and the signal acquisition instrument 41, as well as the signal acquisition instrument 41 and the data analysis unit 42 are electrically connected through wires. The signal acquisition instrument 41 is used to filter and decode the signal collected by the wireless signal receiving unit 32, obtain measurement data, and output data curves to the data analysis unit 42.

[0030] During construction, the prefabricated pipe pile 6 transmits power to the fixing device 18 through the pile shoe 5, and then to the cone tip pressure measuring unit 13 and the side wall pressure measuring unit 14. The cone tip pressure measuring unit 13 then transmits power to the cone tip probe 11, and the cone tip probe 11 transmits the formation resistance it encounters to the cone tip pressure measuring unit 13, thereby obtaining the cone tip pressure. The side wall pressure measuring unit 14 transmits power to the side wall friction cylinder 12, and the side wall friction cylinder 12 transmits the friction resistance it encounters to the side wall pressure measuring unit 14, thereby obtaining the side wall friction force. The pore pressure measuring unit 15 can measure the pore water pressure near the cone tip probe 11, and the depth measuring unit 16 can measure the displacement, thereby obtaining the current depth of the cone tip probe 11 relative to the ground. The four measurement data detected by the above cone tip pressure measurement unit 13, the side wall pressure measurement unit 14, the pore pressure measurement unit 15, and the depth measurement unit 16 are transmitted to the data conversion unit 22 in the form of voltage signals. After conversion, the wireless signal transmitting unit 23 sends a radio electromagnetic wave signal to the wireless signal amplifier 31, and finally transmits the wireless signal to the wireless signal receiving unit 32, and transmits the signal data to the signal acquisition instrument 41 through a wire, and outputs the data curve to the data analysis unit 42. Combined with the previous survey data, it is possible to detect stratum changes or whether there are existing buildings (structures) under the pile in advance, so as to issue an early warning to prevent damage to the pile body or underground pipe network.

[0031] The formation detection component 1 has the characteristic of a leading effect, that is, when the cone tip probe 11 is about to enter but has not yet entered the next formation, parameters such as the cone head resistance will be affected by the lower formation and show some characteristics of the lower formation, and the greater the difference in mechanical properties between the upper and lower formations, the more obvious this effect will be.

[0032] The wireless signal amplifier 31 has a built-in power supply and does not require external power supply. The layout interval is determined according to the signal amplifier specifications and actual construction conditions, so that the amplified signal is sent to the wireless signal receiving unit 32, thereby obtaining a stable and continuous electromagnetic wave signal.

[0033] The data analysis unit is a computer that can automatically determine the type of stratum directly below the current pile location based on the stratum data obtained in the previous survey stage, and issue an alarm when the probe approaches a sudden change in the stratum (such as boulders, caves, etc.) or an existing underground building (structure) (such as tunnels, pipelines, etc.), informing the construction personnel and making timely adjustments to the construction process.

[0034] The present invention is not limited to the applications listed in the specification and implementation modes. For those skilled in the art, various corresponding changes and modifications can be made according to the present invention, and the corresponding changes and modifications all fall within the protection scope of the claims of the present invention.

Claims

1. A stratum advance warning device for pile sinking construction, characterized in that: It comprises a formation detection component, a wireless signal transmitting component, a wireless signal receiving component and a data processing component. The formation detection component comprises a cone tip probe, a side wall friction cylinder, a cone tip pressure measuring unit, a side wall pressure measuring unit, a pore pressure measuring unit, a depth measuring unit and a fixing device. The side wall friction cylinder connects the lower cone tip probe and the upper fixing device. A sealing device is provided at the connection between the cone tip probe and the side wall friction cylinder, and between the side wall friction cylinder and the fixing device. The cone tip pressure measuring unit, the side wall pressure measuring unit and the pore pressure measuring unit are all installed in the side wall friction cylinder, and the depth measuring unit is installed in the cone tip pressure measuring unit. The cone tip probe and the cone tip pressure measuring unit, the cone tip probe and the pore pressure measuring unit, and the cone tip pressure measuring unit and the fixing device are all spliced ​​by threads. The fixing device Installed on the pile shoe, the wireless signal transmitting component is connected to the fixing device of the formation detection component as a whole, and the wireless signal transmitting component includes a power supply, a data conversion unit, a wireless signal transmitting unit and a circular connector plug, and the circular connector plug is installed on the circular connector socket and realizes electrical connection; the power supply is used to pass the circular connector plug and the circular connector socket to supply power to the cone tip pressure measuring unit, the side wall pressure measuring unit, the pore pressure measuring unit, the depth measuring unit, and the data conversion unit and the wireless signal transmitting unit; the circular connector plug is electrically connected to the data conversion unit through a wire; the cone tip pressure measuring unit, the side wall pressure measuring unit, the pore pressure measuring unit and the depth measuring unit of the formation detection component are used to detect continuous cone tip pressure, side wall friction, pore water pressure and depth data of the formation respectively; The data conversion unit is electrically connected to the wireless signal transmitting unit through a wire; the data conversion unit is used to convert the cone tip pressure, side wall friction, pore water pressure and depth data into voltage signals, and transmit them to the wireless signal transmitting component; the wireless signal receiving component is arranged inside the pile wall of the prefabricated pipe pile, and the wireless signal transmitting component is used to convert the voltage signal of the formation data detected by the formation detection component into an electromagnetic wave signal, and send it to the wireless signal receiving component; the data processing component is connected to the wireless signal receiving component.

2. The stratum advance warning device for pile driving construction according to claim 1 is characterized in that: The cone tip probe and the side wall friction tube extend beyond the pile shoe by a certain height.

3. The stratum advance warning device for pile driving construction according to claim 1 is characterized in that: The sealing device is also provided with a waterproof structure.

4. The stratum advance warning device for pile driving construction according to claim 1 is characterized in that: The wireless signal receiving component includes several wireless signal amplifiers and a wireless signal receiving unit. The wireless signal transmitting unit and the first wireless signal amplifier, the wireless signal amplifiers, and the last wireless signal amplifier and the wireless signal receiving unit are wirelessly connected via electromagnetic waves.

5. The stratum advance warning device for pile driving construction according to claim 4 is characterized in that: The data processing component includes a signal acquisition instrument and a data analysis unit. The wireless signal receiving unit and the signal acquisition instrument, as well as the signal acquisition instrument and the data analysis unit are electrically connected through wires. The signal acquisition instrument is used to filter and decode the signal collected by the wireless signal receiving unit, obtain measurement data, and output a data curve to the data analysis unit.

6. The stratum advance warning device for pile driving construction according to claim 4 is characterized in that: The wireless signal amplifier has a built-in power supply.

7. The stratum advance warning device for pile driving construction according to claim 4 is characterized in that: The arrangement interval of the wireless signal amplifiers is determined according to the specifications of the signal amplifiers and the actual construction conditions.

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