A pile end grouting device and method for high-frequency vibrated steel pipe piles

Abstract

This invention discloses a grouting device and method for steel pipe piles used in high-frequency vibratory pile driving. The device includes a cylindrical body with a central through hole. The cylindrical body is provided with an installation hole for connecting to the steel pipe pile driven by high-frequency vibratory pile driving. Multiple vertical grouting channels are provided on the side wall of the cylindrical body. Internal threads for connecting to grouting pipes are provided within the vertical grouting channels. Two horizontal grouting channels are provided on the side wall of the cylindrical body from the outside in. The ports of the upper and lower horizontal grouting channels on the side wall of the cylindrical body are the first and second grouting outlets in the diameter direction. The end of the vertical grouting channel away from the installation hole is the third grouting outlet. This invention can, after pile driving, inject grout into the soil surrounding the pile end of the steel pipe pile simultaneously or first through the first grouting outlet and then through the second and third grouting outlets to improve soil density and structural strength, thereby increasing the bearing capacity of the pile foundation.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a grouting device and method for the pile end of steel pipe piles used in high-frequency vibration pile driving. Background Technology

[0002] Steel pipe piles, with their advantages of high strength, ability to withstand large impact forces, easy penetration of hard soil layers, high bearing capacity, ability to withstand large horizontal forces, and adjustable pile length, are widely used in foundation engineering, municipal engineering, and port engineering. High-frequency vibratory pile driving technology, including steel pipe pile driving, is extensively used in the construction of elevated expressways. High-frequency vibratory pile driving uses an electric or hydraulically driven hammer to rotate one or more pairs of eccentric blocks. The resulting centrifugal forces cancel each other out horizontally and superimpose vertically to form a harmonic excitation force for pile driving. A periodic dynamic load is applied to the pile top, and there is no vibration output during the start-up and shutdown phases to avoid resonance, thus greatly reducing the impact of soil vibration and decreasing soil resistance to the pile, allowing the pile to be successfully driven to the design elevation. The disadvantages are that high-frequency vibration pile driving can cause structural damage to the soil around the steel pipe pile during pile driving, resulting in a temporary loss of strength. Grouting at the pile tip is typically used to improve the pile's bearing capacity, but grouting from inside the steel pipe pile to the pile tip is hindered by soil resistance, making it difficult to insert the grouting pipe to the bottom of the pile. Furthermore, the soil layer corresponding to the pile tip is relatively deep, resulting in significant external soil resistance during grouting. During each pump withdrawal or replacement, the soil mixture from the external grout can easily flow back into the grouting pipe, causing blockage and affecting the grouting effect. Summary of the Invention

[0003] The purpose of this invention is to provide a grouting device and method for steel pipe piles used in high-frequency vibration pile driving, so as to solve the problem that it is difficult to insert the grouting pipe to the bottom of the pile end of the steel pipe pile for grouting due to the influence of the depth of the steel pipe pile, so as to improve the wall environment around the pile end and enhance the bearing capacity of the pile foundation.

[0004] To solve the above-mentioned technical problems, the present invention provides a grouting device for the pile end of a steel pipe pile used in high-frequency vibration pile driving, comprising a columnar body with a central through hole. One end of the columnar body has a concave mounting hole for connecting to the steel pipe pile driven by high-frequency vibration, with one end facing downwards. Multiple vertical grouting channels are arranged on the side wall of the columnar body, surrounding the central through hole and extending through the length of the columnar body. These vertical grouting channels are located between the mounting hole and the central through hole. The vertical grouting channels are located at one end of the mounting hole. The channel is provided with an internal thread for connecting to the grouting pipe inside the steel pipe pile inserted for high-frequency vibration driving. The columnar body has two transverse grouting channels connected to the vertical grouting channel from the outside to the inside along its radial sidewall. The port of the upper transverse grouting channel on the sidewall of the columnar body is the first grouting outlet in the diameter direction, and the port of the lower transverse grouting channel on the sidewall of the columnar body is the second grouting outlet in the diameter direction. The end of the vertical grouting channel away from the mounting hole is the third grouting outlet in the vertical direction.

[0005] Furthermore, in the pile end grouting device for high-frequency vibration pile driving provided by the present invention, an electromagnet is embedded in the side wall of the columnar body located between the first grouting outlet and the second grouting outlet. When the electromagnet is energized, it makes sealed contact with the vertical grouting channel, blocking the flow path of the vertical grouting channel so that the grout flowing into the vertical grouting channel flows out only from the first grouting outlet. When the electromagnet is de-energized, it separates from the vertical grouting channel, keeping the vertical grouting channel unobstructed, so that the grout flowing into the vertical grouting channel can flow out from the second grouting outlet and the third grouting outlet.

[0006] Furthermore, the pile end grouting device for high-frequency vibration pile driving provided by the present invention has tubular components installed in the grouting channels corresponding to the first grouting outlet, the second grouting outlet and the third grouting outlet, and check valves installed on the tubular components, which are respectively located at the first grouting outlet, the second grouting outlet and the third grouting outlet.

[0007] Furthermore, the grouting device for the pile end of a steel pipe pile for high-frequency vibration pile driving provided by the present invention has an upwardly inclined guide surface at the first grouting outlet and a downwardly inclined guide surface at the second grouting outlet.

[0008] Furthermore, the grouting device for the pile end of a steel pipe pile for high-frequency vibration pile driving provided by the present invention has a cylindrical body.

[0009] To solve the above-mentioned technical problems, the present invention provides another technical solution: a pile end grouting method for steel pipe piles used in high-frequency vibration pile driving, employing the aforementioned pile end grouting device for steel pipe piles used in high-frequency vibration pile driving.

[0010] Before driving the pile, the pile end grouting device is connected to the lower end of the steel pipe pile driven by high frequency vibration through the installation hole. The grouting pipe is inserted into the steel pipe pile and connected to the vertical grouting channel.

[0011] The high-frequency vibration pile driving process is used to drive the pile end grouting device together with the steel pipe pile and the grouting pipe.

[0012] After the pile is driven, grouting is injected into the grouting pipe through the grouting pump. The grout in the grouting pipe is injected into the soil around the pile end of the steel pipe pile through the vertical grouting channel and the horizontal grouting channel and the corresponding check valve through the first, second and third grouting outlets.

[0013] Compared with the prior art, the beneficial effects of the grouting device and method for steel pipe piles used in high-frequency vibration pile driving provided by the present invention are as follows:

[0014] Before pile driving, the pile end grouting device is connected to the lower end of the steel pipe pile using high-frequency vibration pile driving through the installation hole. A grouting pipe is inserted into the steel pipe pile and connected to the vertical grouting channel, thus facilitating the connection between the grouting pipe and the pile end grouting device at the pile end of the steel pipe pile. The high-frequency vibration pile driving process is used to drive the pile end grouting device together with the steel pipe pile and the grouting pipe. After pile driving, grouting is performed on the grouting pipe using a grouting pump. The grout in the grouting pipe is injected into the soil around the pile end of the steel pipe pile through the vertical and horizontal grouting channels from the first, second, and third grouting outlets. This improves the area where the steel pipe pile causes structural damage to the soil around the pile end during pile driving, thereby increasing the soil density and structural strength, forming a strong compressive force on the pile foundation, and improving the bearing capacity of the pile foundation.

[0015] To solve the above-mentioned technical problems, the present invention provides another technical solution: a pile end grouting method for steel pipe piles used in high-frequency vibration pile driving, employing the aforementioned pile end grouting device for steel pipe piles with electromagnets used in high-frequency vibration pile driving.

[0016] Before driving the pile, the pile end grouting device is connected to the lower end of the steel pipe pile driven by high frequency vibration through the installation hole. The grouting pipe is inserted into the steel pipe pile and connected to the vertical grouting channel.

[0017] The high-frequency vibration pile driving process is used to drive the pile end grouting device together with the steel pipe pile and the grouting pipe.

[0018] After the pile is driven, the flow path of the vertical grouting channel is cut off by the electromagnet resistance. Grouting is then performed on the grouting pipe by the grouting pump. The grout in the grouting pipe is injected into the surrounding soil in the middle and upper part of the side of the pile end of the steel pipe pile through the vertical grouting channel and the upper horizontal grouting channel via the check valve.

[0019] Stop grouting;

[0020] The vertical grouting channel and the flow path of the first grouting outlet are flushed and cleaned with water through the grouting pipe;

[0021] After the grout injected into the soil around the middle and upper area of ​​the pile tip mixes and solidifies with the soil, the electromagnet is de-energized and the flow path of the vertical grouting channel is connected. The grouting pump is used to inject grout into the grouting pipe, so that the grout in the grouting pipe is injected into the soil around the middle and lower side of the pile tip and the soil in the lower part of the pile tip through the vertical grouting channel and the lower horizontal grouting channel through the corresponding check valves from the second grouting outlet and the third grouting outlet.

[0022] Stop grouting and remove the grouting pipe.

[0023] Compared with the prior art, the beneficial effects of the grouting device and method for steel pipe piles used in high-frequency vibration pile driving provided by the present invention are as follows:

[0024] Before pile driving, the pile end grouting device is connected to the lower end of the steel pipe pile using high-frequency vibration pile driving through the installation hole. A grouting pipe is inserted into the steel pipe pile and connected to the vertical grouting channel, facilitating the connection between the grouting pipe and the pile end grouting device at the pile end of the steel pipe pile. High-frequency vibration pile driving technology is used to drive the pile end grouting device along with the steel pipe pile and grouting pipe. After pile driving, the electromagnet is switched off to cut off the flow path of the vertical grouting channel, allowing the grout in the grouting pipe to be injected into the surrounding soil in the upper and middle area of ​​the side of the steel pipe pile end through the vertical grouting channel and the upper horizontal grouting channel. The grouting pipe then grouts the vertical grouting channel and the first grouting outlet. The flow path of the grout outlet is flushed with water. After the grout injected into the middle and upper area of ​​the pile tip mixes and solidifies with the soil, the electromagnet is de-energized and the flow path of the vertical grouting channel is connected. This allows the grout in the grouting pipe to be injected into the soil surrounding the middle and lower side of the pile tip and the lower part of the pile tip through the vertical grouting channel and the lower horizontal grouting channel. This improves the soil density and structural strength in areas where the soil around the pile tip is structurally damaged during the high-frequency vibration pile driving process, thereby forming a strong compressive force on the pile foundation and improving the bearing capacity of the pile foundation.

[0025] After pile driving, grouting is first performed from the first grouting outlet into the soil surrounding the upper and middle area of ​​the side of the steel pipe pile tip. After the grout mixes and solidifies with the soil at this point, it is then injected from the second and third grouting outlets into the soil surrounding the lower and middle area of ​​the side of the steel pipe pile tip and the soil in the lower part of the pile tip. At this time, because the soil surrounding the upper and middle area of ​​the side of the pile tip at the first grouting outlet has solidified with the grout inside, the soil density and structural strength at this point have been improved. When grouting through the second and third grouting outlets, the grout is blocked and can only be injected downwards, avoiding the problem of grout overflowing along the pipe wall of the steel pipe pile and causing grout waste. In other words, the sequential grouting method can prevent the problem of grout overflowing along the pipe wall of the steel pipe pile and causing grout waste when grouting through the first, second, and third grouting outlets at the same time.

[0026] After grouting is completed at the first grouting outlet, the vertical grouting channel and the flow path of the first grouting outlet are flushed with water through the grouting pipe to clean the grout in the vertical grouting channel, the horizontal grouting channel above it, and the flow path of the first grouting outlet. This is to prevent the grout from solidifying and blocking the grouting channel, thus preventing subsequent grouting through the second and third grouting outlets. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the elevation section of a pile end grouting device with the electromagnet in the on state, according to one embodiment.

[0028] Figure 2 yes Figure 1 A cross-sectional view of the pile end grouting device and its electromagnet in the disconnected state.

[0029] Figure 3 yes Figure 2 A top-view structural diagram;

[0030] Figure 4 yes Figure 1 Diagram showing the connection status of the pile end grouting device with the electromagnet in the on state, the steel pipe pile, and the grouting pipe.

[0031] Figure 5 yes Figure 2 Diagram showing the connection status of the pile end grouting device with the electromagnet disconnected, the steel pipe pile, and the grouting pipe.

[0032] Figure 6 This is a schematic diagram of the elevation section of another embodiment of the pile end grouting device;

[0033] Figure 7 yes Figure 6 A diagram showing the connection status of the pile end grouting device with the steel pipe pile and grouting pipe;

[0034] Figure 8This is a schematic diagram of the elevation section of another embodiment of the pile end grouting device;

[0035] Figure 9 yes Figure 8 A diagram showing the connection status of the pile end grouting device with the steel pipe pile and grouting pipe;

[0036] As shown in the figure:

[0037] 100. Pile tip grouting device;

[0038] 110. Columnar body; 111. Central through hole; 112. Mounting hole;

[0039] 120. Vertical grouting channel; 121. Internal thread; 122. Third grouting outlet;

[0040] 130. Horizontal grouting channel; 131. First grouting outlet; 132. Second grouting outlet;

[0041] 140. Check valve; 141. Tubular component;

[0042] 150. Electromagnet;

[0043] 200. Steel pipe piles;

[0044] 300. Grouting pipe. Detailed Implementation

[0045] The present invention will now be described in detail with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0046] Example 1

[0047] Please refer to Figures 6 to 7This invention provides a pile end grouting device 100 for steel pipe piles used in high-frequency vibration pile driving, comprising a columnar body 110 having a central through hole 111. One end of the columnar body 110 has a recessed mounting hole 200 for connection with a steel pipe pile 200 used in high-frequency vibration pile driving, with one end facing downwards. Multiple vertical grouting channels 120 are arranged on the side wall of the columnar body 110, surrounding the central through hole 111 and extending through the length of the columnar body 110. The vertical grouting channels 120 are located between the mounting hole 200 and the central through hole 111. A grouting device is provided within one end of the vertical grouting channel 120 located at the mounting hole 200. The internal thread 121 is used to connect with the grouting pipe 300 inside the steel pipe pile 200 inserted for high-frequency vibration pile driving. The columnar body 110 has two transverse grouting channels 130 connected to the vertical grouting channel 120, arranged from the outside to the inside along its radial sidewall. The upper transverse grouting channel 130 has a first grouting outlet 131 in the diameter direction at its port on the sidewall of the columnar body 110, and the lower transverse grouting channel 130 has a second grouting outlet 132 in the diameter direction at its port on the sidewall of the columnar body 110. The end of the vertical grouting channel 120 away from the mounting hole 200 is a third grouting outlet 122 in the vertical direction. That is, the first grouting outlet 131 and the second grouting outlet 132 are lateral, i.e., transverse, while the third grouting outlet 122 is axial, i.e., longitudinal and vertical. The mounting hole 200 is a blind hole, which can be either an internal thread 121 or an embedded hole. When the thread is internal (121), the mounting hole 200 is threadedly connected to the steel pipe pile 200; when it is an embedded hole, the mounting hole 200 is interference-fitted with the steel pipe pile 200. The columnar body 110 includes, but is not limited to, a round steel pipe.

[0048] Embodiment 1 of the present invention also provides a method for grouting the pile end of a steel pipe pile for high-frequency vibration pile driving. Using the pile end grouting device 100 for high-frequency vibration pile driving described in Embodiment 1, the method may include the following steps:

[0049] Step 411: Before pile driving, connect the pile end grouting device 100 to the lower end of the high-frequency vibratory driven steel pipe pile 200 through the mounting hole 200. Insert the grouting pipe 300 into the steel pipe pile 200 and connect the grouting pipe 300 to the vertical grouting channel 120. The connection between the pile end grouting device 100 and the high-frequency vibratory driven steel pipe pile 200, and the connection between the grouting pipe 300 and the pile end grouting device 100, facilitates the insertion of the grouting pipe 300 into the pile end.

[0050] Step 412: The high-frequency vibration pile driving process is used to drive the pile end grouting device 100 together with the steel pipe pile 200 and the grouting pipe 300.

[0051] Step 413: After the pile is driven, grouting is performed on the grouting pipe 300 by the grouting pump, so that the grout in the grouting pipe 300 is injected into the soil around the pile end of the steel pipe pile 200 through the vertical grouting channel 120 and the horizontal grouting channel 130.

[0052] The pile end grouting device 100 and method for high-frequency vibration pile driving provided in Embodiment 1 of the present invention, before pile driving, connects the pile end grouting device 100 to the lower end of the high-frequency vibration driven steel pipe pile 200 through the mounting hole 200. A grouting pipe 300 is inserted into the steel pipe pile 200 and connected to the vertical grouting channel 120, thereby facilitating the connection between the grouting pipe 300 and the pile end grouting device 100 at the pile end of the steel pipe pile 200. The high-frequency vibration pile driving process is used to attach the pile end grouting device 100 to the steel pipe pile 200 and... The grouting pipe 300 is used for pile driving. After pile driving, grouting is pumped into the grouting pipe 300. The grout in the grouting pipe 300 is injected into the soil around the pile tip of the steel pipe pile 200 through the vertical grouting channel 120 and the horizontal grouting channel 130 from the first, second and third grouting outlets 131, 132 and 122. This improves the area of ​​structural damage to the soil around the pile tip caused by the high-frequency vibration pile driving process, thereby increasing the soil density and structural strength, forming a strong compressive force on the pile foundation and improving the bearing capacity of the pile foundation.

[0053] Please refer to Figures 6 to 7 To ensure the filling and coverage of the soil at the pile tip by the grout flowing from the grouting pipe 300 through the first grouting outlet 131 and the second grouting outlet 132, the pile tip grouting device 100 for high-frequency vibration pile driving provided in Embodiment 1 of the present invention has an upwardly inclined guide surface at the first grouting outlet 131 and a downwardly inclined guide surface at the second grouting outlet 132. The upwardly inclined guide surface ensures that the grout flowing from the first grouting outlet 131 sprays upwards to quickly fill the structurally damaged soil in the upper and middle parts of the pile side during pile driving. The downwardly inclined guide surface ensures that the grout flowing from the second grouting outlet 132 sprays downwards to quickly fill the structurally damaged soil in the lower part of the pile side and the pile tip during pile driving, thereby ensuring the grouting effect and improving the density and structural strength of the soil around the pile tip. The pile end refers to the side and lower part of the lower end of the steel pipe pile 200. After the steel pipe pile 200 is connected to the pile end grouting device 100, it also includes the side and lower part of the pile end grouting device 100.

[0054] Example 2

[0055] Please refer to Figures 8 to 9The pile end grouting device 100 for high-frequency vibration pile driving provided in Embodiment 2 of the present invention is an improvement on Embodiment 1. The difference lies in that a tubular component 141 is installed in the grouting channels corresponding to the first grouting outlet 131, the second grouting outlet 132, and the third grouting outlet 122. A check valve 140 is installed on the tubular component 141, and the check valve 140 is located at the first grouting outlet 131, the second grouting outlet 132, and the third grouting outlet 122, respectively. The tubular component 141 can be a circular pipe. The addition of the tubular component 141 is for installing the check valve 140, avoiding the problem that the check valve 140 cannot be directly installed in the horizontal grouting channel 130 and the vertical grouting channel 120. The check valve 140 prevents external soil from entering the hole during pile driving and prevents the soil mixed with external grout from flowing back into the hole and causing blockage when the pump is withdrawn or replaced.

[0056] The pile end grouting method for steel pipe piles used in high-frequency vibration pile driving provided in Embodiment 2 of the present invention may include the following steps:

[0057] Step 421: Before pile driving, connect the pile end grouting device 100 to the lower end of the high-frequency vibratory driven steel pipe pile 200 through the mounting hole 200. Insert the grouting pipe 300 into the steel pipe pile 200 and connect the grouting pipe 300 to the vertical grouting channel 120. The connection between the pile end grouting device 100 and the high-frequency vibratory driven steel pipe pile 200, and the connection between the grouting pipe 300 and the pile end grouting device 100, facilitates the insertion of the grouting pipe 300 into the pile end.

[0058] Step 422: The high-frequency vibration pile driving process is used to drive the pile end grouting device 100 together with the steel pipe pile 200 and the grouting pipe 300.

[0059] Step 423: After pile driving, grouting is performed on the grouting pipe 300 by grouting pump. The grout in the grouting pipe 300 is injected into the soil around the pile end of the steel pipe pile 200 through the vertical grouting channel 120 and the horizontal grouting channel 130 and the corresponding check valve 140.

[0060] The pile end grouting device 100 and method for high-frequency vibration pile driving provided in Embodiment 2 of the present invention can prevent the grout and soil at the first, second and third grouting outlets from flowing back into the vertical grouting channel 120, the horizontal grouting channel 130 and the grouting pipe 300 during the pump withdrawal, pump replacement and grouting stoppage, thus avoiding the problem of blockage of the horizontal grouting channel 120, the vertical grouting channel 130 and the grouting pipe 300, which would affect the continued grouting.

[0061] Example 3

[0062] Please refer to Figures 1 to 5The pile end grouting device 100 for high-frequency vibration pile driving provided in Embodiment 3 of the present invention is an improvement on Embodiment 2. The difference is that an electromagnet 150 is embedded in the side wall of the columnar body 110 located between the first grouting outlet 131 and the second grouting outlet 132. When the electromagnet 150 is energized, it is in sealed contact with the vertical grouting channel 120, blocking the flow path of the vertical grouting channel 120 so that the grout flowing into the vertical grouting channel 120 flows out only from the first grouting outlet 131. When the electromagnet 150 is de-energized, it is separated from the vertical grouting channel 120, keeping the vertical grouting channel 120 unobstructed, so that the grout flowing into the vertical grouting channel 120 can flow out from the second grouting outlet 132 and the third grouting outlet 122. The number of vertical grouting channels 120 is not limited to two; it can be four, six, eight, or even more than eight. To improve the grouting efficiency and coverage of the soil around the pile tip, there can be four vertical grouting channels 120 arranged in a cross shape or eight vertical grouting channels 120 arranged in a star shape. The number of horizontal grouting channels 130 varies with the number of vertical grouting channels 120. One vertical grouting channel 120 corresponds to two horizontal grouting channels 130 above and below.

[0063] The electromagnet 150 can be installed by slotting the side wall of the column 110, installing the electromagnet 150, and then sealing it. Alternatively, a vertical slot can be opened downwards from the mounting hole 112, the electromagnet 150 can be installed in the vertical slot, and then the top of the vertical slot can be sealed. The structure of the electromagnet 150 is well known in the art. Alternatively, the electromagnet 150 can be replaced by a hydraulic cylinder, in which case the push rod of the hydraulic cylinder is an arc shape that matches the vertical grouting channel 120, or an indirect connecting component with an arc shape that matches the vertical grouting channel 120 can be connected to the push rod. When the electromagnet 150, hydraulic cylinder, etc., involve connecting wires, the connecting wires can be tied along the grouting pipe 300 to the top of the steel pipe pile 200.

[0064] Please refer to Figures 1 to 2 To improve the fluidity of the grout, the connection between the vertical grouting channel 120 and the horizontal grouting channel 130 has a beveled angle.

[0065] Embodiment 3 of the present invention also provides a method for grouting the pile end of a steel pipe pile for high-frequency vibration pile driving, using the pile end grouting device 100 for high-frequency vibration pile driving described in Embodiment 3 above, comprising:

[0066] Step 431: Before driving the pile, connect the pile end grouting device 100 to the lower end of the steel pipe pile 200 driven by high frequency vibration through the installation hole 200, insert the grouting pipe 300 into the steel pipe pile 200, and connect the grouting pipe 300 to the vertical grouting channel 120.

[0067] Step 432: The high-frequency vibration pile driving process is used to drive the pile end grouting device 100 together with the steel pipe pile 200 and the grouting pipe 300.

[0068] Step 433: After pile driving, the electromagnet 150 is switched on to cut off the flow path of the vertical grouting channel 120. Grouting is then performed on the grouting pipe 300 using a grouting pump. The grout in the grouting pipe 300 is injected through the vertical grouting channel 120 and the upper horizontal grouting channel 130, via the check valve 140, from the first grouting outlet 131 into the surrounding soil in the upper and middle area of ​​the side of the steel pipe pile 200. Figure 4 As shown.

[0069] Step 434: Stop grouting and flush the flow path of the vertical grouting channel 120 and the first grouting outlet 131 with water through the grouting pipe 300. The purpose of water flushing is to ensure that no grout remains in the grouting channel 120 and the horizontal grouting channel 130, and to prevent the grout remaining in the grouting channel 120 and the horizontal grouting channel 130 from solidifying and blocking them, thus preventing subsequent grouting processes.

[0070] Step 435: After the grout injected into the soil surrounding the upper and middle area of ​​the pile tip mixes and solidifies with the soil, the electromagnet 150 is de-energized to connect the flow path of the vertical grouting channel 120. The grouting pump then injects grout into the grouting pipe 300, causing the grout in the grouting pipe 300 to flow through the vertical grouting channel 120 and the lower horizontal grouting channel 130, and through the corresponding check valves 140, into the soil surrounding the lower and middle area of ​​the side of the pile tip of the steel pipe pile 200, as well as the soil in the lower part of the pile tip. Figure 5 As shown.

[0071] Step 436: Stop grouting and remove grouting pipe 300.

[0072] The pile end grouting device 100 and method for high-frequency vibration pile driving provided in Embodiment 3 of the present invention, after pile driving, disconnects the flow path of the vertical grouting channel 120 by switching on the electromagnet 150, allowing the grout in the grouting pipe 300 to be injected into the soil surrounding the upper and middle area of ​​the side of the pile end of the steel pipe pile 200 through the vertical grouting channel 120 and the upper horizontal grouting channel 130 from the first grouting outlet 131; the flow path of the vertical grouting channel 120 and the first grouting outlet 131 is flushed with water through the grouting pipe 300; the grout injected into the soil surrounding the upper and middle area of ​​the pile end mixes with the soil. After solidification, the electromagnet 150 is de-energized and the flow path of the vertical grouting channel 120 is connected. This allows the grout in the grouting pipe 300 to be injected into the soil surrounding the lower part of the side of the pile end of the steel pipe pile 200 and the soil in the lower part of the pile end through the vertical grouting channel 120 and the lower horizontal grouting channel 130. This improves the soil density and structural strength in the area where the soil around the pile end is structurally damaged during the high-frequency vibration pile driving process, thereby forming a strong compressive force on the pile foundation and improving the bearing capacity of the pile foundation.

[0073] The pile tip grouting device 100 and method for high-frequency vibration pile driving of steel pipe piles provided in Embodiment 3 of the present invention, after pile driving, firstly, grouting is performed in the soil surrounding the upper and middle areas of the side of the pile tip of the steel pipe pile 200 from the first grouting outlet 131. After the grout mixes and solidifies with the soil at this point, it is injected into the soil surrounding the lower and middle areas of the side of the pile tip of the steel pipe pile 200 and the soil in the lower area of ​​the pile tip from the second grouting outlet 132 and the third grouting outlet 122 for grouting. At this time, because The soil surrounding the upper part of the side of the pile end at the first grouting outlet 131 and the grout inside solidify, improving the soil density and structural strength at this location. When grouting through the second and third grouting outlets 122, the grout is blocked and can only be injected downwards, avoiding the problem of grout overflowing along the pipe wall of the steel pipe pile 200 and causing grout waste. In other words, the sequential grouting method can prevent the problem of grout overflowing along the pipe wall of the steel pipe pile 200 and causing grout waste when grouting at the first, second and third grouting outlets at the same time.

[0074] The pile end grouting device 100 and method for high-frequency vibration pile driving provided in Embodiment 3 of the present invention, after grouting is completed at the first grouting outlet 131, uses the grouting pipe 300 to flush and clean the flow path of the vertical grouting channel 120 and the first grouting outlet 131, so as to clean the grout in the vertical grouting channel 120, the upper horizontal grouting channel 130 and the flow path of the first grouting outlet 131, and avoid the problem that the grout remaining in the flow path will solidify and block the grouting channel, thus preventing subsequent grouting through the second and third grouting outlets.

[0075] This invention is not limited to the specific embodiments described above. Obviously, the embodiments described above are only a part of the embodiments of this invention, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of this invention are within the scope of protection of this invention. Those skilled in the art can make other modifications and variations to this invention. Therefore, if these modifications and variations of this invention fall within the scope of the claims of this invention, then this invention also intends to include these modifications and variations.

Claims

1. A grouting device for the pile end of a steel pipe pile used in high-frequency vibration pile driving, characterized in that, The device includes a columnar body with a central through hole. One end of the columnar body has a recessed mounting hole on its wall facing downwards for connection to a steel pipe pile driven by high-frequency vibration. Multiple vertical grouting channels are arranged on the sidewall of the columnar body, surrounding the central through hole and extending through the length of the columnar body. These vertical grouting channels are located between the mounting hole and the central through hole. The vertical grouting channel at one end of the mounting hole has an internal thread for connection to a grouting pipe inserted into the steel pipe pile driven by high-frequency vibration. The columnar body has two transverse grouting channels, one above the other, connected to the vertical grouting channels, arranged from the outside inwards along its radial sidewall. The port of the upper transverse grouting channel on the sidewall of the columnar body has a diameter of... The column has a first grouting outlet in the directional direction, and the port of the horizontal grouting channel below it on the side wall of the column is the second grouting outlet in the diametrical direction. The end of the vertical grouting channel away from the mounting hole is the third grouting outlet in the vertical direction. An electromagnet is embedded in the side wall of the column located between the first grouting outlet and the second grouting outlet. When the electromagnet is energized, it makes a sealing contact with the vertical grouting channel, blocking the flow path of the vertical grouting channel so that the grout flowing into the vertical grouting channel only flows out from the first grouting outlet. When the electromagnet is de-energized, it separates from the vertical grouting channel, keeping the vertical grouting channel unobstructed, so that the grout flowing into the vertical grouting channel can flow out from the second grouting outlet and the third grouting outlet.

2. The pile end grouting device for steel pipe piles used in high-frequency vibration pile driving according to claim 1, characterized in that, A tubular component is installed in the grouting channel corresponding to the first grouting outlet, the second grouting outlet, and the third grouting outlet. A check valve is installed on the tubular component, and the check valve is located at the first grouting outlet, the second grouting outlet, and the third grouting outlet, respectively.

3. The pile end grouting device for steel pipe piles used in high-frequency vibration pile driving according to claim 1, characterized in that, The first grouting outlet is provided with an upwardly inclined guide surface, and the second grouting outlet is provided with a downwardly inclined guide surface.

4. The pile end grouting device for steel pipe piles used in high-frequency vibration pile driving according to claim 1, characterized in that, The column is a round tube.

5. A method for grouting the pile end of a steel pipe pile for high-frequency vibration pile driving, characterized in that, The pile end grouting device for steel pipe piles used in high-frequency vibration pile driving as described in claim 1 is adopted. Before driving the pile, the pile end grouting device is connected to the lower end of the steel pipe pile driven by high frequency vibration through the installation hole. The grouting pipe is inserted into the steel pipe pile and connected to the vertical grouting channel. The high-frequency vibration pile driving process is used to drive the pile end grouting device together with the steel pipe pile and the grouting pipe. After the pile is driven, the flow path of the vertical grouting channel is cut off by the electromagnet resistance. Grouting is then performed on the grouting pipe by the grouting pump. The grout in the grouting pipe is injected into the surrounding soil in the middle and upper part of the side of the pile end of the steel pipe pile through the vertical grouting channel and the upper horizontal grouting channel via the check valve. Stop grouting; The vertical grouting channel and the flow path of the first grouting outlet are flushed and cleaned with water through the grouting pipe; After the grout injected into the soil around the middle and upper area of ​​the pile tip mixes and solidifies with the soil, the electromagnet is de-energized and the flow path of the vertical grouting channel is connected. The grouting pump is used to inject grout into the grouting pipe, so that the grout in the grouting pipe is injected into the soil around the middle and lower side of the pile tip and the soil in the lower part of the pile tip through the vertical grouting channel and the lower horizontal grouting channel through the corresponding check valves from the second grouting outlet and the third grouting outlet. Stop grouting and remove the grouting pipe.

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