Pile tip grouting device and method for steel pipe pile for high-frequency vibration pile sinking

Abstract

The invention discloses a pile end grouting device and method for a steel pipe pile for high-frequency vibration pile sinking, the device comprises a cylindrical body with a central through hole, the cylindrical body is provided with a mounting hole used for being connected with the steel pipe pile for high-frequency vibration pile sinking, the side wall of the cylindrical body is provided with a plurality of vertical grouting channels, and the vertical grouting channels are communicated with the central through hole. An inner thread used for being connected with a grouting pipe is arranged in the vertical grouting channel, an upper transverse grouting channel and a lower transverse grouting channel are arranged on the side wall of the cylindrical body from outside to inside, and ports, in the side wall of the cylindrical body, of the upper transverse grouting channel and the lower transverse grouting channel are a first grouting outlet and a second grouting outlet in the diameter direction. And a third grouting outlet is formed in one end, far away from the mounting hole, of the vertical grouting channel. After pile sinking, grouting can be conducted through the first grouting outlet, the second grouting outlet and the third grouting outlet at the same time or firstly through the first grouting outlet and then through the second grouting outlet and the third grouting outlet into soil around the pile end of the steel pipe pile, the soil density and the structural strength are improved, and the bearing capacity of a pile foundation is improved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a pile end grouting device and method for a steel pipe pile used for high-frequency vibration pile sinking. Background Art

[0002] Steel pipe piles have the 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 arbitrarily adjustable pile length. They are widely used in foundation engineering, municipal engineering, and port engineering. High-frequency vibration pile driving and other steel pipe pile driving techniques are widely used in the construction of elevated expressways. High-frequency vibration pile driving is driven by electricity or hydraulics to drive one or more pairs of eccentric blocks in the pile hammer to rotate. The centrifugal forces generated offset each other in the horizontal direction and superimpose each other in the vertical direction to form a simple harmonic excitation force to sink the pile. A periodic dynamic load is applied to the top of the pile. There is no vibration output during the start-stop stage to avoid resonance, which greatly reduces the impact of soil vibration and reduces the resistance of the soil to the pile, so that the pile can be sunk to the designed elevation smoothly. The disadvantage is that the use of high-frequency vibration pile sinking will cause the soil structure around the steel pipe pile to be destroyed and temporarily lose strength. Grouting at the pile end is usually used to improve the bearing capacity of the pile foundation, but grouting from the inside of the steel pipe pile to the pile end will be affected by the obstruction of the soil, and it is difficult to insert the grouting pipe to the bottom of the steel pipe pile. In addition, the soil layer corresponding to the pile end is deeper, and the external soil resistance is greater during grouting. During each pump withdrawal, pump replacement and stop grouting, the external slurry mixed with part of the soil is easy to flow back into the grouting pipe, causing the grouting pipe to be blocked and affecting the grouting effect. Summary of the invention

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

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is: a pile end grouting device for a steel pipe pile for high-frequency vibration pile driving, comprising a columnar body with a central through hole, wherein the wall surface of one end of the columnar body along its length direction is downwardly provided with a concave mounting hole for connecting with the steel pipe pile for high-frequency vibration pile driving, and the side wall of the columnar body is provided with a plurality of vertical grouting channels distributed around the central through hole and running through the length of the columnar body, wherein the vertical grouting channels are located between the mounting hole and the central through hole, and the vertical grouting channels located at one end of the mounting hole are ... and the vertical grouting channels located at one end of the mounting hole are provided with a plurality of vertical grouting channels distributed around the central through hole and running through the length of the columnar body, and the vertical grouting channels located at the The channel is provided with an internal thread for connecting to a grouting pipe inserted into a steel pipe pile for high-frequency vibration pile driving. The columnar body is provided with two upper and lower transverse grouting channels connected to the vertical grouting channel along its radial side wall from the outside to the inside. The upper port of the transverse grouting channel on the side wall of the columnar body is a first grouting outlet in the diameter direction, the lower port of the transverse grouting channel on the side wall of the columnar body is a second grouting outlet in the diameter direction, and the end of the vertical grouting channel away from the mounting hole is a 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 and installed on the side wall of the columnar body between the first grouting outlet and the second grouting outlet, and when the electromagnet is energized, it is in sealing contact with the vertical grouting channel to block the flow path of the vertical grouting channel so that the slurry flowing into the vertical grouting channel only flows out from the first grouting outlet; when the electromagnet is de-energized, it is separated from the vertical grouting channel to keep the vertical grouting channel unobstructed so that the slurry 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 steel pipe piles used for high-frequency vibration pile driving provided by the present invention has tubular members installed in grouting channels corresponding to the first grouting outlet, the second grouting outlet and the third grouting outlet, and check valves installed on the tubular members, and the check valves are respectively located at the first grouting outlet, the second grouting outlet and the third grouting outlet.

[0007] Furthermore, in the pile end grouting device for high-frequency vibration pile driving provided by the present invention, 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.

[0008] Furthermore, in the pile end grouting device for steel pipe piles used for high-frequency vibration pile driving provided by the present invention, the columnar body is a circular tube.

[0009] In order to solve the above technical problems, the present invention provides another technical solution: a pile end grouting method for a steel pipe pile used for high-frequency vibration pile driving, using the above-mentioned pile end grouting device for a steel pipe pile used for high-frequency vibration pile driving,

[0010] Before pile sinking, the pile end grouting device is connected to the lower end of the steel pipe pile for high-frequency vibration pile sinking through the installation hole, a grouting pipe is inserted into the steel pipe pile, and the grouting pipe is connected to the vertical grouting channel;

[0011] The high-frequency vibration pile sinking process is used to sink the pile end grouting device together with the steel pipe pile and the grouting pipe;

[0012] After the pile is sunk, the grouting pipe is grouted by a grouting pump, so that the slurry in the grouting pipe is injected into the soil around the pile end of the steel pipe pile from the first, second and third grouting outlets through the vertical grouting channel and the horizontal grouting channel through the corresponding check valves.

[0013] Compared with the prior art, the pile end grouting device and method for high-frequency vibration pile sinking provided by the present invention have the following beneficial effects:

[0014] Before pile sinking, the pile end grouting device is connected to the lower end of the steel pipe pile of high-frequency vibration pile sinking through the installation hole, the grouting pipe is inserted into the steel pipe pile, and the grouting pipe is connected to the vertical grouting channel, so as to facilitate the connection of the grouting pipe and the pile end grouting device at the pile end of the steel pipe pile. The pile end grouting device is used together with the steel pipe pile and the grouting pipe by the high-frequency vibration pile sinking process. After the pile is sunk, the grouting pipe is grouted by a grouting pump, so that the slurry 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 from the first, second and third grouting outlets, so as to improve the area where the steel pipe pile of the high-frequency vibration pile sinking process causes structural damage to the soil around the pile end to improve the soil density and structural strength, thereby forming a firm squeezing force on the pile foundation and improving the bearing capacity of the pile foundation.

[0015] In order to solve the above technical problems, the present invention provides another technical solution: a pile end grouting method for a steel pipe pile used for high-frequency vibration pile driving, using the above-mentioned pile end grouting device for a steel pipe pile used for high-frequency vibration pile driving with an electromagnet,

[0016] Before pile sinking, the pile end grouting device is connected to the lower end of the steel pipe pile for high-frequency vibration pile sinking through the installation hole, a grouting pipe is inserted into the steel pipe pile, and the grouting pipe is connected to the vertical grouting channel;

[0017] The high-frequency vibration pile sinking process is used to sink the pile end grouting device together with the steel pipe pile and the grouting pipe;

[0018] After the pile is sunk, the electromagnet is turned on to cut off the flow path of the vertical grouting channel, and the grouting pipe is grouted by a grouting pump, so that the slurry in the grouting pipe is injected into the surrounding soil in the upper middle area of ​​the side of the pile end of the steel pipe pile through the vertical grouting channel and the upper transverse grouting channel through the check valve from the first grouting outlet;

[0019] Stop grouting;

[0020] Flushing and cleaning the vertical grouting channel and the flow path of the first grouting outlet through the grouting pipe;

[0021] After the slurry injected into the surrounding soil in the middle and upper area of ​​the pile end is mixed with the soil and solidified, the electromagnet is turned off to connect the flow path of the vertical grouting channel, and the grouting pipe is grouted by the grouting pump, so that the slurry in the grouting pipe is injected into the surrounding soil in the middle and lower area of ​​the side of the pile end of the steel pipe pile and the soil in the lower area of ​​the pile end through the vertical grouting channel and the lower transverse grouting channel through the corresponding check valve 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 pile end grouting device and method for high-frequency vibration pile sinking provided by the present invention have the following beneficial effects:

[0024] Before pile sinking, the pile end grouting device is connected to the lower end of the steel pipe pile of high-frequency vibration pile sinking through the installation hole, the grouting pipe is inserted into the steel pipe pile, and the grouting pipe is connected to the vertical grouting channel, so as to facilitate the connection of the grouting pipe and the pile end grouting device at the pile end of the steel pipe pile. The pile end grouting device is attached to the steel pipe pile and the grouting pipe by adopting the high-frequency vibration pile sinking process. After the pile is sunk, the electromagnet is turned on to cut off the flow path of the vertical grouting channel, so that the slurry in the grouting pipe is injected into the surrounding soil in the upper middle area of ​​the side of the pile end of the steel pipe pile from the first grouting outlet through the vertical grouting channel and the upper transverse grouting channel; the vertical grouting channel and the first grouting channel are grouted by the grouting pipe. The flow path of the slurry outlet is flushed and cleaned; after the slurry injected into the surrounding soil in the middle and upper area of ​​the pile end is mixed with the soil and solidified, the electromagnet is turned off to connect the flow path of the vertical grouting channel, so that the slurry in the grouting pipe is injected from the second grouting outlet and the third grouting outlet into the surrounding soil in the middle and lower area of ​​the side of the pile end of the steel pipe pile and the soil in the lower area of ​​the pile end through the vertical grouting channel and the horizontal grouting channel below, thereby improving the area where the steel pipe pile caused structural damage to the soil around the pile end during pile sinking by the high-frequency vibration pile driving process to improve the soil density and structural strength, thereby forming a strong squeezing pressure on the pile foundation and improving the bearing capacity of the pile foundation.

[0025] After the pile is sunk, grouting is first performed from the first grouting outlet into the surrounding soil in the middle and upper area of ​​the side of the pile end of the steel pipe pile. After the slurry here is mixed with the soil and solidified, grouting is injected from the second grouting outlet and the third grouting outlet into the surrounding soil in the middle and lower area of ​​the side of the pile end of the steel pipe pile and the soil in the lower area of ​​the pile end for grouting. At this time, since the surrounding soil in the middle and upper area of ​​the side of the pile end at the first grouting outlet and the slurry therein have solidified, the soil density and structural strength here are improved. When grouting is performed through the second and third grouting outlets, the slurry is blocked and can only be injected downward, avoiding the problem of slurry waste caused by bubbling up along the pipe wall of the steel pipe pile. That is, the sequential grouting method can prevent the problem of slurry waste caused by bubbling up along the pipe wall of the steel pipe pile when grouting is performed at 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 and cleaned through the grouting pipe to clean the slurry in the vertical grouting channel and the horizontal grouting channel above and the flow path of the first grouting outlet, so as to avoid the problem that the slurry retained in the slurry flow path solidifies and causes the grouting channel to be blocked and subsequent grouting cannot be performed through the second and third grouting outlets. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the vertical cross-sectional structure of a pile end grouting device in an embodiment in which the electromagnet is in an on state;

[0028] Figure 2 yes Figure 1 A schematic diagram of a vertical cross-sectional structure of a pile end grouting device and an electromagnet in a disconnected state;

[0029] Figure 3 yes Figure 2 A schematic diagram of a top view structure;

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

[0031] Figure 5 yes Figure 2 A diagram showing the connection state of the pile end grouting device, the steel pipe pile and the grouting pipe, with the electromagnet in the disconnected state;

[0032] Figure 6 is a schematic elevational cross-sectional structural diagram of a pile end grouting device according to another embodiment;

[0033] Figure 7 yes Figure 6 The connection state diagram of the pile end grouting device, the steel pipe pile and the grouting pipe;

[0034] Figure 8is a schematic elevational cross-sectional structural diagram of a pile end grouting device according to another embodiment;

[0035] Fig. 9 yes Figure 8 The connection state diagram of the pile end grouting device, the steel pipe pile and the grouting pipe;

[0036] As shown in the figure:

[0037] 100. Pile end 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, transverse grouting channel, 131, first grouting outlet, 132, second grouting outlet;

[0041] 140, check valve, 141, tubular part;

[0042] 150. Electromagnet;

[0043] 200. Steel pipe piles;

[0044] 300. Grouting pipe. DETAILED DESCRIPTION

[0045] The present invention is described in detail below in conjunction with the accompanying drawings: The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0046] Embodiment 1

[0047] Please refer to Figure 6 to Figure 7The first embodiment of the present invention provides a pile end grouting device 100 for a steel pipe pile used for high-frequency vibration pile driving, comprising a columnar body 110 having a central through hole 111, wherein the wall surface of one end of the columnar body 110 along the length direction thereof is downwardly provided with a concave mounting hole 200 for connecting with a steel pipe pile 200 used for high-frequency vibration pile driving, and the side wall of the columnar body 110 is provided with a plurality of vertical grouting channels 120 distributed around the central through hole 111 and running through the length of the columnar body 110, wherein the vertical grouting channels 120 are located between the mounting hole 200 and the central through hole 111, and a vertical grouting channel 120 located at one end of the mounting hole 200 is provided. The inner thread 121 is used to connect with the grouting pipe 300 inserted into the steel pipe pile 200 for high-frequency vibration pile driving. The columnar body 110 is provided with two upper and lower transverse grouting channels 130 connected with the vertical grouting channel 120 along the side wall of the radial direction from the outside to the inside. The upper port of the transverse grouting channel 130 on the side wall of the columnar body 110 is the first grouting outlet 131 in the diameter direction, and the lower port of the transverse grouting channel 130 on the side wall of the columnar body 110 is the second grouting outlet 132 in the diameter direction. The end of the vertical grouting channel 120 away from the mounting hole 200 is the third grouting outlet 122 in the vertical direction. That is, the first grouting outlet 131 and the second grouting outlet 132 are lateral, that is, transverse, and the third grouting outlet 122 is axial, that is, longitudinal and vertical. The mounting hole 200 is a blind hole, which can be an inner thread 121 or an embedded hole. When the internal thread 121 is used, the mounting hole 200 is threadedly connected with the steel pipe pile 200, and when the internal thread 121 is used, the mounting hole 200 is interference fit with the steel pipe pile 200. The columnar body 110 includes but is not limited to a round steel pipe.

[0048] The first embodiment of the present invention further provides a pile end grouting method for a steel pipe pile used for high-frequency vibration pile driving, and the pile end grouting device 100 for high-frequency vibration pile driving of the first embodiment may include the following steps:

[0049] Step 411, before pile sinking, the pile end grouting device 100 is connected to the lower end of the steel pipe pile 200 for high-frequency vibration pile sinking through the mounting hole 200, the grouting pipe 300 is inserted into the steel pipe pile 200, and the grouting pipe 300 is connected to the vertical grouting channel 120. The pile end grouting device 100 is connected to the steel pipe pile 200 for high-frequency vibration pile sinking, and the grouting pipe 300 is connected to the pile end grouting device 100, thereby facilitating the insertion of the grouting pipe 300 into the pile end.

[0050] Step 412, high-frequency vibration pile sinking technology is used to sink 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 sunk, grouting is performed on the grouting pipe 300 by a grouting pump, so that the slurry in the grouting pipe 300 is injected into the soil around the pile end of the steel pipe pile 200 from the first, second and third grouting outlets 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 of a steel pipe pile provided in the first embodiment of the present invention are as follows: before the pile driving, the pile end grouting device 100 is connected to the lower end of the steel pipe pile 200 for high-frequency vibration pile driving through the mounting hole 200, the grouting pipe 300 is inserted into the steel pipe pile 200, and the grouting pipe 300 is 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, and the pile end grouting device 100 is attached to the steel pipe pile 200 and the pile end grouting device 100 by using the high-frequency vibration pile driving process. The grouting pipe 300 is used for pile sinking. After the pile is sunk, the grouting pipe 300 is grouted by a grouting pump, so that the slurry in the grouting pipe 300 is injected into the soil around the pile end of the steel pipe pile 200 from the first, second and third grouting outlets 131, 132 and 122 through the vertical grouting channel 120 and the horizontal grouting channel 130, thereby improving the area where the steel pipe pile 200 caused structural damage to the soil around the pile end during pile sinking by the high-frequency vibration pile sinking process to improve the soil density and structural strength, thereby forming a strong squeezing pressure on the pile foundation and improving the bearing capacity of the pile foundation.

[0053] Please refer to Figure 6 to Figure 7 In order to ensure that the slurry flowing out of the grouting pipe 300 is injected into the soil at the side of the pile end through the first grouting outlet 131 and the second grouting outlet 132 to cover the filling range, the first grouting outlet 131 is provided with an upwardly inclined guide surface, and the second grouting outlet 132 is provided with a downwardly inclined guide surface in the pile end grouting device 100 for high-frequency vibration pile driving provided in the first embodiment of the present invention. The upwardly inclined guide surface can ensure that the slurry flowing out of the first grouting outlet 131 is sprayed upward to quickly fill the soil with structural damage in the middle and upper part of the pile side during pile driving, and the downwardly inclined guide surface can ensure that the slurry flowing out of the second grouting outlet 132 is sprayed downward to quickly fill the soil with structural damage in the lower part of the pile side and the pile end during pile driving, thereby ensuring the grouting effect and improving the density and structural strength of the soil around the side of the pile end. The pile end refers to the side and lower part of the lower end of the steel pipe pile 200 , and 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] Embodiment 2

[0055] Please refer to Figures 8 to 9The pile end grouting device 100 for high-frequency vibration pile driving provided in the second embodiment of the present invention is improved on the basis of the first embodiment, and the difference is that a tubular member 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, and a check valve 140 is installed on the tubular member 141, and the check valve 140 is respectively located at the first grouting outlet 131, the second grouting outlet 132 and the third grouting outlet 122. The tubular member 141 can be a circular pipe, and the added tubular member 141 is for installing the check valve 140 to avoid 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 external slurry mixed with part of the soil from flowing back into the hole when the pump is removed or the pump is replaced to stop grouting, causing blockage.

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

[0057] Step 421, before pile sinking, the pile end grouting device 100 is connected to the lower end of the steel pipe pile 200 for high-frequency vibration pile sinking through the mounting hole 200, the grouting pipe 300 is inserted into the steel pipe pile 200, and the grouting pipe 300 is connected to the vertical grouting channel 120. The pile end grouting device 100 is connected to the steel pipe pile 200 for high-frequency vibration pile sinking, and the grouting pipe 300 is connected to the pile end grouting device 100, thereby facilitating the insertion of the grouting pipe 300 into the pile end.

[0058] Step 422, high-frequency vibration pile sinking technology is used to sink the pile end grouting device 100 together with the steel pipe pile 200 and the grouting pipe 300.

[0059] Step 423, after the pile is sunk, grouting is performed on the grouting pipe 300 by a grouting pump, so that the slurry in the grouting pipe 300 is injected into the soil around the pile end of the steel pipe pile 200 from the first, second and third grouting outlets 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 the second embodiment of the present invention can prevent the slurry and soil at the first, second and third grouting outlets from flowing back into the vertical grouting channel 120, the transverse grouting channel 130 and the grouting pipe 300 during the period when the grouting pump is removed, replaced or the grouting is stopped, causing the transverse grouting channel 12, the vertical grouting channel 130 and the grouting pipe 300 to be blocked, thereby affecting the continued grouting.

[0061] Embodiment 3

[0062] Please refer to Figures 1 to 5The pile end grouting device 100 for high-frequency vibration pile driving provided in the third embodiment of the present invention is improved on the basis of the second embodiment, and the difference lies in that an electromagnet 150 is embedded and installed on 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 sealing contact with the vertical grouting channel 120 to block the flow path of the vertical grouting channel 120 so that the slurry flowing into the vertical grouting channel 120 only flows out from the first grouting outlet 131; when the electromagnet 150 is powered off, it is separated from the vertical grouting channel 120 to keep the vertical grouting channel 120 unobstructed so that the slurry 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 the vertical grouting channels 120 is not limited to 2, and can be 4, 6, 8, etc., or more than 8. In order to improve the grouting efficiency and coverage of the soil around the pile end, there can be 4 vertical grouting channels 120 in a cross-shaped distribution, or there can be 8 vertical grouting channels 120 in a M-shaped distribution. The number of the transverse grouting channels 130 changes with the number of the vertical grouting channels 120, and one vertical grouting channel 120 corresponds to two upper and lower transverse grouting channels 130.

[0063] The installation method of the electromagnet 150 can be a method of slotting the side wall of the columnar body 110, installing the electromagnet 150 and then closing it. It is also possible to open a vertical slot downward from the mounting hole 112 to install the electromagnet 150 in the vertical slot, and then close the top of the vertical slot. The structure of the electromagnet 150 is a well-known technology in the art. Alternatively, the electromagnet 150 can be replaced by a hydraulic cylinder, in which case the top rod of the hydraulic cylinder is an arc that matches the vertical grouting channel 120, or an indirect connecting component that is connected to the top rod to match the arc of the vertical grouting channel 120. When the electromagnet 150, the hydraulic cylinder, etc. involve connecting wires such as wires, the connecting wires can be tied along the grouting pipe 300 to the top of the steel pipe pile 200 used.

[0064] Please refer to Figure 1 to Figure 2 In order to improve the fluidity of the slurry, the connecting part between the vertical grouting channel 120 and the horizontal grouting channel 130 has an inclined surface with equal chamfer angle.

[0065] The third embodiment of the present invention further provides a pile end grouting method for a steel pipe pile used for high-frequency vibration pile driving, which uses the pile end grouting device 100 for high-frequency vibration pile driving of the third embodiment, comprising:

[0066] Step 431 , before pile sinking, connect the pile end grouting device 100 to the lower end of the steel pipe pile 200 for high-frequency vibration pile sinking 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 .

[0067] Step 432, high-frequency vibration pile sinking technology is used to sink the pile end grouting device 100 together with the steel pipe pile 200 and the grouting pipe 300.

[0068] Step 433, after the pile is sunk, the electromagnet 150 is turned on to cut off the flow path of the vertical grouting channel 120, and the grouting pipe 300 is grouted by the grouting pump, so that the slurry in the grouting pipe 300 is injected into the surrounding soil in the upper middle area of ​​the side of the pile end of the steel pipe pile 200 from the first grouting outlet 131 through the vertical grouting channel 120 and the upper transverse grouting channel 130 through the check valve 140, as shown in FIG. Figure 4 shown.

[0069] Step 434, stop grouting, and flush the vertical grouting channel 120 and the flow path of the first grouting outlet 131 through the grouting pipe 300. The purpose of water flushing is to ensure that there is no slurry remaining in the grouting channel 120 and the transverse grouting channel 130, and to prevent the grouting channel 120 and the transverse grouting channel 130 from being blocked by the slurry remaining therein after solidification, so that subsequent grouting processes cannot be carried out.

[0070] Step 435, after the slurry injected into the surrounding soil in the middle and upper area of ​​the pile end is mixed with the soil and solidified, the electromagnet 150 is powered off to connect the flow path of the vertical grouting channel 120, and the grouting pipe 300 is grouted by the grouting pump, so that the slurry in the grouting pipe 300 is injected into the surrounding soil in the middle and lower area of ​​the side of the pile end of the steel pipe pile 200 and the soil in the lower area of ​​the pile end through the vertical grouting channel 120 and the lower transverse grouting channel 130 through the corresponding check valve 140 from the second grouting outlet 132 and the third grouting outlet 122, as shown in FIG. Figure 5 shown.

[0071] Step 436, stop grouting and remove the grouting pipe 300.

[0072] The pile end grouting device 100 and method for high-frequency vibration pile driving provided in the third embodiment of the present invention are as follows: after the pile is driven, the electromagnet 150 is turned on to cut off the flow path of the vertical grouting channel 120, so that the slurry in the grouting pipe 300 is injected into the surrounding soil in the upper middle area of ​​the side of the pile end of the steel pipe pile 200 from the first grouting outlet 131 through the vertical grouting channel 120 and the upper transverse grouting channel 130; the flow path of the vertical grouting channel 120 and the first grouting outlet 131 is flushed and cleaned by the grouting pipe 300; the slurry to be injected into the surrounding soil in the upper middle area of ​​the pile end is mixed with the soil. After solidification, the electromagnet 150 is powered off to connect the flow path of the vertical grouting channel 120, so that the slurry in the grouting pipe 300 is injected into the surrounding soil in the lower and middle areas of the side of the pile end of the steel pipe pile 200 and the soil in the lower area of ​​the pile end from the second grouting outlet 132 and the third grouting outlet 122 through the vertical grouting channel 120 and the horizontal grouting channel 130 below, thereby improving the area where the steel pipe pile 200 caused structural damage to the soil around the pile end during pile sinking by the high-frequency vibration pile driving process to improve the soil density and structural strength, thereby forming a strong squeezing pressure on the pile foundation and improving the bearing capacity of the pile foundation.

[0073] The pile end grouting device 100 and method for high-frequency vibration pile driving provided in the third embodiment of the present invention, after the pile is driven, grouting is first performed from the first grouting outlet 131 to the surrounding soil in the upper middle area of ​​the side of the pile end of the steel pipe pile 200. After the slurry is mixed with the soil and solidified, grouting is injected from the second grouting outlet 132 and the third grouting outlet 122 into the surrounding soil in the lower middle area of ​​the side of the pile end of the steel pipe pile 200 and the soil in the lower area of ​​the pile end. At this time, due to The surrounding soil and the slurry in the upper and middle area of ​​the side of the pile end at the first grouting outlet 131 are solidified, which improves the soil density and structural strength here. When grouting through the second and third grouting outlets 122, the slurry is blocked and can only be injected downward, avoiding the problem of slurry bubbling up along the pipe wall of the steel pipe pile 200 and causing slurry waste. That is, the sequential grouting method can prevent the problem of slurry bubbling up along the pipe wall of the steel pipe pile 200 and causing slurry 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 the third embodiment of the present invention, after the grouting at the first grouting outlet 131 is completed, the vertical grouting channel 120 and the flow path of the first grouting outlet 131 are flushed and cleaned through the grouting pipe 300 to clean the slurry in the vertical grouting channel 120 and the upper horizontal grouting channel 130 and the flow path of the first grouting outlet 131, so as to avoid the problem that the slurry retained in the slurry flow path solidifies, causing the grouting channel to be blocked and the post-grouting cannot be performed through the second and third grouting outlets.

[0075] The present invention is not limited to the above-mentioned specific implementation modes. Obviously, the above-mentioned embodiments are only some embodiments of the embodiments of the present invention, but not all embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention. Those skilled in the art can make other levels of modifications and changes to the present invention. In this way, if these modifications and changes of the present invention fall within the scope of the claims of the present invention, the present invention is also intended to include these changes and changes.

Claims

1. A pile end grouting device for steel pipe piles used for high-frequency vibration pile sinking, characterized in that: The invention comprises a columnar body with a central through hole, wherein the wall surface of one end of the columnar body along the length direction thereof is downwardly provided with an inwardly concave mounting hole for connecting to a steel pipe pile for high-frequency vibration pile driving, and the side wall of the columnar body is provided with a plurality of vertical grouting channels distributed around the central through hole and running through the length of the columnar body, the vertical grouting channel is located between the mounting hole and the central through hole, and the vertical grouting channel located at one end of the mounting hole is provided with an internal thread for connecting to a grouting pipe inserted into a steel pipe pile for high-frequency vibration pile driving, and the side wall of the columnar body along the radial direction thereof is provided with two upper and lower transverse grouting channels connected to the vertical grouting channel from the outside to the inside, the upper port of the transverse grouting channel on the side wall of the columnar body is a first grouting outlet in the diameter direction, the lower port of the transverse grouting channel on the side wall of the columnar body is a second grouting outlet in the diameter direction, and the end of the vertical grouting channel away from the mounting hole is a third grouting outlet in the vertical direction.

2. The pile end grouting device for steel pipe piles used for high-frequency vibration pile driving according to claim 1, characterized in that: An electromagnet is embedded and installed on the side wall of the columnar body located between the first grouting outlet and the second grouting outlet. When the electromagnet is energized, it is in sealing contact with the vertical grouting channel to block the flow path of the vertical grouting channel so that the slurry flowing into the vertical grouting channel only flows out from the first grouting outlet; when the electromagnet is de-energized, it is separated from the vertical grouting channel to keep the vertical grouting channel unobstructed so that the slurry flowing into the vertical grouting channel can flow out from the second grouting outlet and the third grouting outlet.

3. The pile end grouting device for steel pipe piles used for high-frequency vibration pile driving according to claim 1, characterized in that: Tubular parts are installed in the grouting channels corresponding to the first grouting outlet, the second grouting outlet and the third grouting outlet, and check valves are installed on the tubular parts. The check valves are respectively located at the first grouting outlet, the second grouting outlet and the third grouting outlet.

4. The pile end grouting device for steel pipe piles used for 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.

5. The pile end grouting device for steel pipe piles used for high-frequency vibration pile driving according to claim 1, characterized in that: The columnar body is a circular tube.

6. A method for grouting the end of a steel pipe pile for high-frequency vibration pile sinking, characterized in that: The pile end grouting device for high-frequency vibration pile sinking of a steel pipe pile according to claim 1 is used. Before pile sinking, the pile end grouting device is connected to the lower end of the steel pipe pile for high-frequency vibration pile sinking through the installation hole, a grouting pipe is inserted into the steel pipe pile, and the grouting pipe is connected to the vertical grouting channel; The high-frequency vibration pile sinking process is used to sink the pile end grouting device together with the steel pipe pile and the grouting pipe; After the pile is sunk, the grouting pipe is grouted by a grouting pump, so that the slurry in the grouting pipe is injected into the soil around the pile end of the steel pipe pile from the first, second and third grouting outlets through the vertical grouting channel and the horizontal grouting channel.

7. A method for grouting the end of a steel pipe pile for high-frequency vibration pile sinking, characterized in that: The pile end grouting device for high-frequency vibration pile sinking of a steel pipe pile as claimed in claim 2 is used. Before pile sinking, the pile end grouting device is connected to the lower end of the steel pipe pile for high-frequency vibration pile sinking through the installation hole, a grouting pipe is inserted into the steel pipe pile, and the grouting pipe is connected to the vertical grouting channel; The high-frequency vibration pile sinking process is used to sink the pile end grouting device together with the steel pipe pile and the grouting pipe; After the pile is sunk, the electromagnet is turned on to cut off the flow path of the vertical grouting channel, and the grouting pipe is grouted by a grouting pump, so that the slurry in the grouting pipe is injected into the surrounding soil in the upper middle area of ​​the side of the pile end of the steel pipe pile through the vertical grouting channel and the upper transverse grouting channel through the check valve from the first grouting outlet; Stop grouting; Flushing and cleaning the vertical grouting channel and the flow path of the first grouting outlet through the grouting pipe; After the slurry injected into the surrounding soil in the middle and upper area of ​​the pile end is mixed with the soil and solidified, the electromagnet is turned off to connect the flow path of the vertical grouting channel, and the grouting pipe is grouted by the grouting pump, so that the slurry in the grouting pipe is injected into the surrounding soil in the middle and lower area of ​​the side of the pile end of the steel pipe pile and the soil in the lower area of ​​the pile end through the vertical grouting channel and the lower transverse grouting channel through the corresponding check valve from the second grouting outlet and the third grouting outlet; Stop grouting and remove the grouting pipe.

Images