Hollow pile post-grouting device and pile bottom post-grouting method thereof

Abstract

The invention relates to the technical field of civil engineering, in particular to a hollow pile post-grouting device and a pile bottom post-grouting method thereof. The hollow pile post-grouting device comprises a hollow pile body, a grouting pump, a flow control system, an intelligent pressure detection unit, a grouting nozzle and a guide positioning mechanism. The pile bottom post-grouting method implemented through the hollow pile post-grouting device comprises the following steps that a pile body is installed; the grouting pump and the hollow pile body are connected; detecting and calibrating the system; adjusting a flow regulator; starting a grouting pump; the grouting pressure is monitored in real time; a protection program; the nozzle automatically expands; adjusting the spraying angle; and grouting is completed. By introducing the intelligent control system, the flow regulator, the automatic stop valve, the pressure compensator, the adjustable jet orifice and the electronic positioning system, the problems of complicated operation, non-uniform grouting effect, high safety risk, material waste, inaccurate positioning and the like in the prior art are solved, and the grouting construction efficiency, safety and reliability are improved.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, and in particular to a hollow pile post-grouting device and a pile bottom post-grouting method thereof. Background Art

[0002] In the field of civil engineering and foundation construction, pile foundation is a common method to improve the stability of buildings. With the continuous improvement of engineering construction requirements and the development of technology, traditional pile foundation construction methods have gradually failed to meet the requirements of high efficiency and high quality. As an effective construction method, pile foundation post-grouting technology injects grout into the bottom of the pile after the pile body is installed to enhance the bearing capacity and durability of the pile foundation. However, traditional grouting devices have several defects when implementing this technology, which limits its scope of application and effect.

[0003] (1) Complex operation and low efficiency: The operation of traditional grouting equipment is relatively complicated and requires frequent manual adjustment of grouting parameters, which not only increases the difficulty of construction but also reduces construction efficiency.

[0004] (2) Uneven grouting effect: Due to the lack of intelligent control system and adjustable nozzle, the grouting material is unevenly distributed at the bottom of the pile, affecting the overall reinforcement effect of the pile foundation.

[0005] (3) High safety risk: There is no real-time pressure detection and protection mechanism. When the grouting pressure exceeds the bearing capacity of the pile body, it is easy to cause damage to the pile body, increasing the construction safety risk.

[0006] (4) Serious waste of materials: Traditional devices lack automatic shut-off valves, which can easily cause waste and environmental pollution when grouting materials flow back.

[0007] (5) Inaccurate positioning: Manual positioning methods have large errors, which affect the grouting effect and the overall quality of the pile foundation.

[0008] (6) Limited data transmission: The wired data transmission method in complex construction environments is unstable, making it difficult to achieve remote monitoring and timely adjustment of grouting parameters. Summary of the invention

[0009] The present invention aims to provide a hollow pile post-grouting device and a pile bottom post-grouting method thereof, which solves the problems existing in the prior art such as complex operation, uneven grouting effect, high safety risk, material waste and inaccurate positioning by introducing an intelligent control system, a flow regulator, an automatic shut-off valve, a pressure compensator, an adjustable injection port and an electronic positioning system, thereby improving the efficiency, safety and reliability of grouting construction.

[0010] The technical solution adopted by the present invention is: a post-grouting device for hollow piles, comprising a hollow pile body, a grouting pump, a flow control system, an intelligent pressure detection unit, a grouting nozzle, and a guide positioning mechanism, wherein the hollow pile body has a structure with an upper opening and a lower closed structure, and a grouting channel is formed in the hollow pile; the grouting pump is connected to the upper opening of the hollow pile body, and is used to pump high-pressure grouting material into the grouting channel; the flow control system is connected between the grouting pump and the hollow pile body, and is used to accurately control the flow of the grouting material; the intelligent pressure detection unit is installed at the interface between the grouting pump and the hollow pile body, and is used to monitor the pressure changes during the grouting process in real time and feed back to the flow control system; the grouting nozzle is arranged at the bottom of the hollow pile body, and can automatically expand under the action of the grouting material to cover a wider pile bottom area and enhance the grouting effect; the guide positioning mechanism is connected to the bottom of the hollow pile body to ensure that the grouting nozzle can be accurately positioned at the optimal grouting position of the pile bottom soil.

[0011] As a further improvement of the present invention, the flow control system consists of a flow regulator, an automatic shut-off valve, and a pressure compensator. The flow regulator can adjust the grouting speed according to the grouting target to ensure uniform grouting; the automatic shut-off valve can automatically close when it detects that the grouting material begins to flow back to prevent material waste and pollution; the pressure compensator automatically adjusts the pumping pressure during the grouting process to adapt to the grouting needs under different geological conditions.

[0012] As a further improvement of the present invention, the intelligent pressure detection unit adopts wireless communication technology to connect with the external control system, and can monitor the grouting pressure in real time over a long distance. When the grouting pressure exceeds a preset range, a protection program is automatically started to avoid damage to the pile body.

[0013] As a further improvement of the present invention, the grouting nozzle is designed with a plurality of injection ports with adjustable angles, which can adjust the injection direction according to the geological characteristics of the pile bottom to achieve uniform grouting.

[0014] As a further improvement of the present invention, the guiding and positioning mechanism includes a positioning pin and an electronic positioning system. The positioning pin is embedded in the soil at the bottom of the pile. The electronic positioning system communicates with an external controller to ensure that the grouting nozzle is accurately aligned with the center of the pile bottom.

[0015] A pile bottom post-grouting method implemented by a hollow pile post-grouting device comprises the following steps:

[0016] Step 1: Pile installation: drive the hollow pile into the predetermined depth, ensuring that the pile is vertically stable and the bottom closed structure is intact;

[0017] Step 2: Connect the grouting pump to the hollow pile body: Connect the grouting pump to the upper opening of the hollow pile body through a special connector to ensure that the connection is sealed and leak-free;

[0018] Step 3: System detection and calibration: Start the intelligent pressure detection unit, detect the initial readings of the pressure sensors and flow sensors of each part, and calibrate them to ensure that the data is accurate and reliable;

[0019] Step 4: Adjust the flow regulator: Set the grouting speed and target pressure value in the external control system, and the flow regulator will be preliminarily adjusted according to the set values;

[0020] Step 5: Start the grouting pump: operate the external control system, start the grouting pump, and pump the high-pressure grouting material to the bottom of the pile through the grouting channel in the hollow pile body;

[0021] Step 6: Real-time monitoring of grouting pressure: The intelligent pressure detection unit monitors the pressure changes during the grouting process in real time and transmits the data to the external control system through wireless communication technology;

[0022] Step 7: Protection program: When the grouting pressure exceeds the preset upper and lower limits, the external control system automatically starts the protection program to prevent damage to the pile body;

[0023] Step 8: Automatic expansion of the nozzle: Under the pressure of the grouting material, the multiple injection ports at the bottom of the grouting nozzle automatically expand to ensure that a wider area of ​​the pile bottom is covered;

[0024] Step 9: Adjust the injection angle: According to the geological characteristics of the pile bottom, the angle of the injection port is automatically adjusted through the data fed back by the electronic positioning system to achieve a more uniform grouting effect;

[0025] Step 10: Grouting is completed: When the injection volume and pressure of the grouting material reach the design requirements, the automatic shut-off valve in the flow control system automatically closes and stops pumping the grouting material into the grouting channel.

[0026] As a further improvement of the present invention, the grouting material includes one of cement slurry, water glass slurry, and a mixture of cement slurry and water glass slurry.

[0027] As a further improvement of the present invention, the ratio of the cement slurry is water and cement, and the ratio is 0.4-0.6:1; the ratio of the water glass slurry is water and water glass, and the ratio is 0.8-1.2:1; the ratio of the cement slurry and water glass slurry mixture is cement slurry and water glass slurry, and they are mixed in a volume ratio of 1:0.5-1.

[0028] As a further improvement of the present invention, the external control system exchanges data with the intelligent pressure detection unit, the flow control system and the electronic positioning system through wireless communication technology. The wireless communication technology includes Wi-Fi, Bluetooth, LoRa, 4G / 5G, which can achieve stable data transmission in a complex construction environment, adjust the parameters in the grouting process in real time, and ensure the grouting effect.

[0029] As a further improvement of the present invention, the protection procedure includes slowing down the grouting speed, adjusting the pumping pressure, and suspending the grouting operation.

[0030] The beneficial effects of the present invention are as follows: (1) Significantly improving the accuracy and efficiency of grouting: The present invention integrates an intelligent control system, a flow regulator and an electronic positioning system to accurately control the flow, speed and injection angle of the grouting material, thereby significantly improving the uniformity and accuracy of grouting. At the same time, automated operation reduces manual intervention, speeds up construction and improves overall work efficiency.

[0031] (2) Enhanced construction safety and reliability: The intelligent pressure detection unit of the present invention monitors the pressure changes during the grouting process in real time and automatically starts the protection program under abnormal conditions, effectively avoiding pile damage and construction accidents. In addition, the application of wireless communication technology enables construction personnel to remotely monitor the grouting process and adjust construction parameters in a timely manner, further enhancing the safety and reliability of construction.

[0032] (3) Realizing resource conservation and environmental protection: The automatic shut-off valve of the present invention can automatically close when it detects that the grouting material begins to flow back, effectively preventing material waste and environmental pollution. At the same time, by accurately controlling the grouting parameters, it can minimize the amount of grouting material used, achieving the dual goals of resource conservation and environmental protection.

[0033] (4) Strong adaptability and wide application: The hollow pile post-grouting device and pile bottom post-grouting method of the present invention can adapt to a variety of different geological conditions and construction environments. By adjusting the ratio of the grouting material and the injection angle, the needs of different projects can be met, and it has broad application prospects and market value. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] The invention provides a hollow pile post-grouting device, comprising a hollow pile body, a grouting pump, a flow control system, an intelligent pressure detection unit, a grouting nozzle, and a guiding and positioning mechanism.

[0036] The hollow pile body of the present invention has a structure with an upper opening and a lower closed portion, and a grouting channel is formed in the hollow pile.

[0037] In the present invention, the grouting pump is connected to the upper opening of the hollow pile body and is used for pumping high-pressure grouting material into the grouting channel.

[0038] The flow control system in the present invention is connected between the grouting pump and the hollow pile body, and is used to accurately control the flow of the grouting material. The flow control system consists of a flow regulator, an automatic shut-off valve, and a pressure compensator. The flow regulator can adjust the grouting speed according to the grouting target to ensure uniform grouting; the automatic shut-off valve can automatically close when it detects that the grouting material begins to flow back, so as to prevent material waste and pollution; the pressure compensator automatically adjusts the pumping pressure during the grouting process to adapt to the grouting needs under different geological conditions.

[0039] The intelligent pressure detection unit in the present invention is installed at the interface between the grouting pump and the hollow pile body, and is used to monitor the pressure changes during the grouting process in real time and feed back to the flow control system. The intelligent pressure detection unit adopts wireless communication technology to connect with the external control system, and can monitor the grouting pressure in real time over a long distance. When the grouting pressure exceeds the preset range, the protection program is automatically started to avoid damage to the pile body.

[0040] The grouting nozzle in the present invention is arranged at the bottom of the hollow pile body, and can automatically expand under the action of the grouting material to cover a wider area of ​​the pile bottom and enhance the grouting effect. The grouting nozzle is designed with multiple injection ports with adjustable angles, and can adjust the injection direction according to the geological characteristics of the pile bottom to achieve uniform grouting.

[0041] The guiding and positioning mechanism in the present invention is connected to the bottom of the hollow pile body to ensure that the grouting nozzle can be accurately positioned at the optimal grouting position of the soil at the bottom of the pile. The guiding and positioning mechanism includes a positioning pin and an electronic positioning system. The positioning pin is embedded in the soil at the bottom of the pile. The electronic positioning system communicates with an external controller to ensure that the grouting nozzle is accurately aligned with the center of the pile bottom.

[0042] A post-grouting method for pile bottom implemented by a hollow pile post-grouting device comprises the following steps: driving the hollow pile body into a predetermined depth to ensure that the pile body is vertically stable and the bottom closed structure is intact; connecting the grouting pump to the upper opening of the hollow pile body through a special connector to ensure that the connection is sealed and leak-free; starting the intelligent pressure detection unit to detect the initial readings of the pressure sensor and flow sensor of each part, and calibrating them to ensure that the data is accurate and reliable; setting the grouting speed and target pressure value in the external control system, and making a preliminary adjustment to the flow regulator according to the set value; operating the external control system to start the grouting pump to pump the high-pressure grouting material to the pile bottom through the grouting channel in the hollow pile body; The pressure detection unit can monitor the pressure changes during the grouting process in real time and transmit the data to the external control system through wireless communication technology; when the grouting pressure exceeds the preset upper and lower limits, the external control system automatically starts the protection program to prevent damage to the pile body; under the pressure of the grouting material, the multiple injection ports at the bottom of the grouting nozzle automatically expand to ensure coverage of a wider area at the bottom of the pile; according to the geological characteristics of the pile bottom, the angle of the injection port is automatically adjusted through the data fed back by the electronic positioning system to achieve a more uniform grouting effect; when the injection volume and pressure of the grouting material reach the design requirements, the automatic shut-off valve in the flow control system automatically closes to stop pumping grouting material into the grouting channel.

[0043] The grouting material in the present invention includes one of cement slurry, water glass slurry, and a mixture of cement slurry and water glass slurry. The cement slurry has a ratio of water to cement of 0.4-0.6:1; the water glass slurry has a ratio of water to water glass of 0.8-1.2:1; the mixture of cement slurry and water glass slurry has a ratio of cement slurry to water glass slurry in a volume ratio of 1:0.5-1.

[0044] In the present invention, the external control system exchanges data with the intelligent pressure detection unit, the flow control system and the electronic positioning system through wireless communication technology. The wireless communication technology includes Wi-Fi, Bluetooth, LoRa, 4G / 5G, which can achieve stable data transmission in a complex construction environment, adjust the parameters of the grouting process in real time, and ensure the grouting effect.

[0045] The protection procedure in the present invention includes slowing down the grouting speed, adjusting the pumping pressure, and suspending the grouting operation.

[0046] Example:

[0047] This embodiment provides a hollow pile post-grouting device and a pile bottom post-grouting method thereof, which are specifically as follows.

[0048] (I) Structure of hollow pile post-grouting device

[0049] Hollow pile body: A reinforced concrete hollow pile with a diameter of 500mm and a length of 20m is selected. A grouting channel with a diameter of 100mm is reserved in the pile body, and the bottom of the pile body is designed as a closed structure to ensure that the grouting material can be evenly spread at the bottom of the pile.

[0050] Grouting pump: A high-pressure grouting pump is selected with a maximum working pressure of 80MPa, which can meet the grouting needs under different types of geological conditions.

[0051] Flow control system: including flow regulator, automatic shut-off valve and pressure compensator, which are integrated and operated through an electronic control panel. The adjustment range of the flow regulator is 0-100L / min, the response time of the automatic shut-off valve is within 1 second, and the pressure compensator can adjust the pressure output of the pump according to real-time pressure feedback, and the error range is controlled within ±2%.

[0052] Intelligent pressure detection unit: installed at the connection between the grouting pump and the hollow pile body, with built-in high-precision pressure sensor and microprocessor, it can monitor the grouting pressure in real time and keep data synchronization with the external control system through LoRa wireless communication technology.

[0053] Grouting nozzle: designed as an automatically expandable multi-angle nozzle, with a total of 6 nozzles, each of which can adjust the angle within the range of 0°-90° to meet the grouting needs under different geological conditions.

[0054] Guiding and positioning mechanism: It includes positioning pins (20mm in diameter and 1000mm in length) and an electronic positioning system. The positioning pins are used to embed the hollow pile into the predetermined position when the pile is driven into the soil to ensure the verticality of the pile. The electronic positioning system communicates with the external controller via Bluetooth to provide precise coordinate information of the grouting nozzle at the bottom of the pile.

[0055] (II) Implementation steps of pile bottom post grouting method

[0056] Step 1: Before installing the pile, use geological radar to detect the construction site, understand the underground soil structure, and select appropriate grouting materials. Accurately drive the hollow pile into the predetermined depth, ensure that the verticality error of the pile does not exceed 2‰, and check whether the closed structure at the bottom of the pile is intact.

[0057] Step 2: Connect the high-pressure grouting pump to the upper opening of the hollow pile body through a dedicated high-pressure pipeline, ensuring that all connection parts are well sealed and there is no leakage.

[0058] Step 3: Turn on the intelligent pressure detection unit and perform zero-point calibration on the pressure sensor and flow sensor at the connection between the grouting pump and the hollow pile body to ensure the accuracy of the monitoring data.

[0059] Step 4: Set the grouting target parameters on the operation interface of the external control system, set the grouting speed to 30L / min, the target pressure to 60MPa, and start the flow regulator to make preliminary flow adjustment.

[0060] Step 5: Start the high-pressure grouting pump and pump the pre-mixed grouting material (a mixture of cement slurry and water glass slurry with a ratio of 1:0.75) into the soil at the bottom of the pile through the grouting channel.

[0061] Step 6: The intelligent pressure detection unit continuously monitors the pressure changes during the grouting process and feeds back the real-time data to the external control system through LoRa wireless communication technology.

[0062] Step 7: When the grouting pressure is monitored to exceed the preset safety range (upper limit 70MPa, lower limit 40MPa), the external control system automatically starts the protection program, notifies the on-site operators to slow down the grouting speed or suspend the grouting, and adjusts the pumping pressure to prevent damage to the pile body.

[0063] Step 8: Under the high pressure of the grouting material, the six injection ports at the bottom of the nozzle gradually expand, and the maximum expansion range can reach 0°-90°. According to the geological conditions of the pile bottom, the angle of each injection port is automatically adjusted through the external control system to ensure that the grouting material can evenly cover the predetermined area of ​​the pile bottom.

[0064] Step 9: The electronic positioning system continuously provides accurate information on the position of the nozzle, compares it with the pre-set center position of the pile bottom, and automatically fine-tunes the angle of the nozzle to further ensure the accuracy and uniformity of grouting.

[0065] Step 10: When the injection volume and grouting pressure of the grouting material reach the design requirements, the automatic shut-off valve in the flow control system responds quickly, closes the grouting channel, stops material pumping, and completes the grouting operation.

[0066] (III) Implementation Effect

[0067] Through the application of this embodiment, not only many problems existing in the traditional post-grouting device are solved, but also the construction efficiency and pile foundation reinforcement effect are significantly improved. Specifically, (1) The construction efficiency is significantly improved: Due to the high degree of automation of the device, manual operation is reduced, the grouting process is smoother, and the construction period is shortened. (2) The grouting effect is more uniform: The intelligently adjusted injection port and pressure compensation mechanism ensure that the grouting material is more evenly distributed at the bottom of the pile, thereby improving the bearing capacity of the pile foundation. (3) Improved construction safety: The real-time pressure monitoring and protection mechanism effectively avoids damage to the pile body caused by excessive pressure and ensures the safety of construction personnel. (4) Resource conservation and environmental protection: The rapid response and precise flow control of the automatic shut-off valve reduce the waste of grouting materials, reduce construction costs, and also reduce the impact on the environment. (5) Strong adaptability: The device can adapt to various geological conditions and meet the specific needs of different engineering projects by adjusting the grouting material ratio and the injection port angle.

[0068] In summary, the present invention provides a hollow pile post-grouting device and a pile bottom post-grouting method thereof, which have significant innovation and practicality, not only improve construction efficiency and quality, but also reduce costs and environmental impacts. The implementation of the device and method of the present invention provides the construction industry with an efficient, safe and environmentally friendly pile foundation reinforcement technology, which has broad market application prospects and promotion value.

[0069] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hollow pile post-grouting device, characterized in that: It comprises a hollow pile body, a grouting pump, a flow control system, an intelligent pressure detection unit, a grouting nozzle, and a guiding and positioning mechanism. The hollow pile body has a structure with an upper opening and a lower closing, and a grouting channel is formed in the hollow pile; the grouting pump is connected to the upper opening of the hollow pile body and is used to pump high-pressure grouting material into the grouting channel; the flow control system is connected between the grouting pump and the hollow pile body and is used to accurately control the flow of the grouting material; the intelligent pressure detection unit is installed at the interface between the grouting pump and the hollow pile body and is used to monitor the pressure changes during the grouting process in real time and feed back to the flow control system; the grouting nozzle is arranged at the bottom of the hollow pile body and can automatically expand under the action of the grouting material to cover a wider area of ​​the pile bottom and enhance the grouting effect; the guiding and positioning mechanism is connected to the bottom of the hollow pile body to ensure that the grouting nozzle can be accurately positioned at the optimal grouting position of the soil at the pile bottom.

2. A hollow pile post-grouting device according to claim 1, characterized in that: The flow control system consists of a flow regulator, an automatic shut-off valve, and a pressure compensator. The flow regulator can adjust the grouting speed according to the grouting target to ensure uniform grouting; the automatic shut-off valve can automatically close when it detects that the grouting material begins to flow back to prevent material waste and pollution; the pressure compensator automatically adjusts the pumping pressure during the grouting process to adapt to the grouting needs under different geological conditions.

3. A hollow pile post-grouting device according to claim 1, characterized in that: The intelligent pressure detection unit is connected to the external control system using wireless communication technology, and can monitor the grouting pressure in real time over a long distance. When the grouting pressure exceeds a preset range, a protection program is automatically started to avoid damage to the pile body.

4. A hollow pile post-grouting device according to claim 1, characterized in that: The grouting nozzle is designed with a plurality of injection ports with adjustable angles, and the injection direction can be adjusted according to the geological characteristics of the pile bottom to achieve uniform grouting.

5. A hollow pile post-grouting device according to claim 1, characterized in that: The guiding and positioning mechanism comprises a positioning pin and an electronic positioning system. The positioning pin is embedded in the soil at the bottom of the pile. The electronic positioning system communicates with an external controller to ensure that the grouting nozzle is accurately aligned with the center of the bottom of the pile.

6. A pile bottom post-grouting method implemented by using the hollow pile post-grouting device according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Pile installation: drive the hollow pile into the predetermined depth, ensuring that the pile is vertically stable and the bottom closed structure is intact; Step 2: Connect the grouting pump to the hollow pile body: Connect the grouting pump to the upper opening of the hollow pile body through a special connector to ensure that the connection is sealed and leak-free; Step 3: System detection and calibration: Start the intelligent pressure detection unit, detect the initial readings of the pressure sensors and flow sensors of each part, and calibrate them to ensure that the data is accurate and reliable; Step 4: Adjust the flow regulator: Set the grouting speed and target pressure value in the external control system, and the flow regulator will be preliminarily adjusted according to the set values; Step 5: Start the grouting pump: operate the external control system, start the grouting pump, and pump the high-pressure grouting material to the bottom of the pile through the grouting channel in the hollow pile body; Step 6: Real-time monitoring of grouting pressure: The intelligent pressure detection unit monitors the pressure changes during the grouting process in real time and transmits the data to the external control system through wireless communication technology; Step 7: Protection program: When the grouting pressure exceeds the preset upper and lower limits, the external control system automatically starts the protection program to prevent damage to the pile body; Step 8: Automatic expansion of the nozzle: Under the pressure of the grouting material, the multiple injection ports at the bottom of the grouting nozzle automatically expand to ensure that a wider area of ​​the pile bottom is covered; Step 9: Adjust the injection angle: According to the geological characteristics of the pile bottom, the angle of the injection port is automatically adjusted through the data fed back by the electronic positioning system to achieve a more uniform grouting effect; Step 10: Grouting is completed: When the injection volume and pressure of the grouting material reach the design requirements, the automatic shut-off valve in the flow control system is automatically closed to stop pumping the grouting material into the grouting channel.

7. A pile bottom post-grouting method implemented by a hollow pile post-grouting device according to claim 6, characterized in that: The grouting material includes one of cement slurry, water glass slurry, and a mixture of cement slurry and water glass slurry.

8. A pile bottom post-grouting method implemented by a hollow pile post-grouting device according to claim 7, characterized in that: The cement slurry has a ratio of water to cement of 0.4-0.6:1; the water glass slurry has a ratio of water to water glass of 0.8-1.2:1; the mixture of cement slurry and water glass slurry has a ratio of cement slurry to water glass slurry and is mixed in a volume ratio of 1:0.5-1.

9. A pile bottom post-grouting method implemented by a hollow pile post-grouting device according to claim 6, characterized in that: The external control system exchanges data with the intelligent pressure detection unit, the flow control system and the electronic positioning system through wireless communication technology. The wireless communication technology includes Wi-Fi, Bluetooth, LoRa, 4G / 5G, which can achieve stable data transmission in complex construction environments, adjust the parameters of the grouting process in real time, and ensure the grouting effect.

10. A pile bottom post-grouting method implemented by a hollow pile post-grouting device according to claim 6, characterized in that: The protection procedure includes slowing down the grouting speed, adjusting the pumping pressure, and suspending the grouting operation.