Pile foundation post-grouting one-way grouting head

Abstract

The utility model discloses a pile foundation post-grouting one-way grouting head, and relates to the technical field of bridge construction, the grouting head comprises a grouting pipe, a connecting pipe and a grout outlet head which are communicated in sequence, one end of the grouting pipe far away from the connecting pipe is used for being communicated with a grouting pipe, and one end of the connecting pipe connected with the grouting pipe is provided with a one-way valve structure. Slurry in the connecting pipe is prevented from flowing to the grouting pipe. The one-way valve structure is arranged at the joint of the connecting pipe and the mud jacking pipe, so that slurry in the connecting pipe is prevented from flowing back into the mud jacking pipe in the process of adjusting the position of the slurry outlet head to be aligned with the pile side and the pile end, and the problem that slurry is easy to flow back when the mud jacking head is adjusted in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to a pile foundation post-grouting one-way grouting head. Background Art

[0002] The construction of bored piles adopts mud wall protection technology. The mud used to prevent hole collapse, lubricate the drill bit, and suspend the drilling debris leaves a layer of paste-like mud skin between the outer surface of the pile and the hole wall after the pile is formed, so that the friction between the pile and the foundation soil becomes the friction between the outer surface of the pile and the mud skin. The mud skin has poor shear resistance and is very easy to slide, which greatly reduces the lateral friction resistance of the pile. At the same time, the gravel sediment in the mud and the scraped materials on the hole wall when the steel cage is lowered form sediment at the bottom of the pile, reducing the bearing capacity of the pile end.

[0003] Post-grouting technology for pile foundation is the main measure to eliminate the two unfavorable factors that affect the bearing capacity of bored piles, namely, the sediment at the pile end and the mud skin around the pile. Post-grouting at the pile end and pile side means pre-burying the grouting pipe on the pile body. After the bored pile concrete is poured, when the pile body concrete reaches a certain strength, the cement slurry is pumped through the grouting pipe pre-placed at the bottom of the pile and the side of the pile for secondary splitting grouting. The pressure drop at the pile end causes the sediment at the pile end and the loose soil layer to form a consolidated state. Grouting at the pile side replaces the mud skin on the pile side, increases the friction between the pile body and the soil around the pile, and strengthens the soil layer at the pile end and the side of the pile, thereby increasing the bearing capacity of the pile.

[0004] In the prior art, during the grouting process, secondary splitting grouting is performed through grouting pipes pre-installed at the bottom and side of the pile. The position of the grouting holes is not flexible, which requires the arrangement of multiple grouting pipes. In addition, the problem of mud reflux is prone to occur when adjusting the grouting outlets, which not only causes certain obstacles to the grouting process, but also reduces the grouting quality. Utility Model Content

[0005] In view of the defects existing in the prior art, the purpose of the utility model is to provide a post-grouting one-way valve for pile foundation to solve the problem in the prior art that the adjustment of the grouting head easily causes mud backflow.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The present application provides a one-way grouting head for post-grouting of a pile foundation, which is characterized in that it comprises a grouting pipe, a connecting pipe and a grouting head which are connected in sequence, wherein one end of the grouting pipe away from the connecting pipe is used to be connected with a grouting pipe, and one end of the connecting pipe connected to the grouting pipe is provided with a one-way valve structure to prevent the slurry in the connecting pipe from flowing into the grouting pipe.

[0008] In some optional embodiments, the one-way valve structure includes:

[0009] A valve hole diaphragm, which is connected to the inner wall of the connecting pipe in its circumferential direction, and the valve hole diaphragm is provided with a through hole for the slurry to flow;

[0010] The valve diaphragm is attached to the side of the valve hole diaphragm close to the slurry outlet head, and a valve hole is opened on the valve diaphragm. The valve hole and the through hole are staggered. When the slurry flows from the grouting pipe to the slurry outlet head, there is a gap between the valve diaphragm and the valve hole diaphragm. When the slurry flows from the grouting pipe to the slurry outlet head, the valve diaphragm and the valve hole diaphragm are attached to close the through hole.

[0011] In some optional embodiments, the through hole is opened in the center of the valve hole diaphragm, and the plurality of valve hole rings are arranged on the peripheral side of the center of the valve diaphragm. A folding portion is provided on the peripheral side of the valve hole for making the area formed by the plurality of valve hole rings close the through hole or move away from the through hole.

[0012] In some optional embodiments, the valve diaphragm is made of elastic material.

[0013] In some optional embodiments, the connecting pipe includes a connecting head and a bellows, the connecting head is connected to the grouting pipe, the one-way valve structure is arranged in the connecting head, and the two ends of the bellows are respectively connected to the connecting head and the slurry outlet head, so as to adjust the relative position of the slurry outlet head with respect to the grouting pipe.

[0014] In some optional embodiments, the connecting head can be detachably connected to both the grouting pipe and the corrugated pipe.

[0015] In some optional embodiments, the above-mentioned pulp outlet head includes:

[0016] A slurry outlet pipe, one end of which is away from the connecting pipe is closed, and a plurality of slurry outlet holes are provided on the side wall of the slurry outlet pipe at intervals in the circumferential direction;

[0017] A check valve is provided at the above-mentioned slurry outlet to prevent the slurry from flowing back;

[0018] A trumpet shield is sleeved outside the slurry outlet pipe and is used to isolate the check valve from the pile body. A slurry outlet is formed between the large-diameter end of the trumpet shield and the slurry outlet pipe.

[0019] In some optional embodiments, the check valve comprises:

[0020] A rubber pad, which covers the slurry outlet hole, is fixedly connected to the wall of the slurry outlet pipe, and the connection is close to the small diameter end of the horn shield;

[0021] A metal gasket is connected to the rubber gasket and is used to seal the slurry outlet hole.

[0022] In some optional embodiments, the metal gasket is connected and fixed to the rubber pad via an outer adhesive tape, and the rubber pad is bonded and fixed to the slurry outlet head.

[0023] In some optional embodiments, the one-way valve structure is a rubber valve protruding toward one side of the grouting pipe, and a portion of the outer edge of the rubber valve is connected to the inner wall of the connecting pipe.

[0024] Compared with the prior art, the advantages of the utility model are:

[0025] A one-way valve structure is provided at the connection between the connecting pipe and the grouting pipe to prevent the slurry in the connecting pipe from flowing back into the grouting pipe during the process of adjusting the position of the grouting head to align with the pile side and pile end, thereby solving the problem in the prior art that the adjustment of the grouting head easily causes the slurry to flow back. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 This is a structural schematic diagram of a post-grouting one-way valve for pile foundation according to the utility model;

[0028] Figure 2 for Figure 1 A schematic diagram of the structure of the middle connector;

[0029] Figure 3 for Figure 2 A schematic diagram of the structure of the valve hole diaphragm of the one-way valve structure;

[0030] Figure 4 for Figure 2 A schematic diagram of the structure of the valve diaphragm of the one-way valve structure;

[0031] Figure 5 for Figure 2 A cross-sectional schematic diagram of the one-way valve structure;

[0032] Figure 6 for Figure 1 Schematic diagram of the cross-sectional structure of the center pulp head.

[0033] In the figure: 1. grouting pipe; 2. connecting pipe; 21. connecting head; 210. internal thread; 211. external thread; 22. bellows; 3. slurry outlet head; 31. slurry outlet pipe; 310. slurry outlet; 311. slurry outlet hole; 312. plug; 32. check valve; 321. metal gasket; 322. rubber gasket; 323. outer tape; 33. horn guard; 4. one-way valve structure; 41. valve hole diaphragm; 411. through hole; 42. valve diaphragm; 421. valve hole; 422. folding part. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0035] The following is a further detailed description of an embodiment of a pile foundation post-grouting one-way grouting head of the utility model in conjunction with the accompanying drawings.

[0036] like Figure 1 As shown, the present application provides a one-way grouting head for post-grouting of a pile foundation, comprising a grouting pipe 1, a connecting pipe 2 and a grouting head 3 which are connected in sequence, the end of the grouting pipe 1 away from the connecting pipe 2 is used to be connected with a grouting pipe, and the end of the connecting pipe 2 connected to the grouting pipe 1 is provided with a one-way valve structure 4 to prevent the slurry in the connecting pipe 2 from flowing into the grouting pipe 1.

[0037] It can be understood that the connecting pipe 2 has a certain length, one end of the connecting pipe 2 is connected to the grouting pipe 1, and the other end is connected to the grouting head 3. When post-grouting is required, the grouting pipe is extended into the borehole, and the grouting head 3 is aligned with the pile side and the pile end; then, the cement slurry is pumped to the position of each grouting head 3. At this time, the cement slurry enters each grouting head 3 from the grouting pipe, and the one-way valve structure 4 is forced to open by pressure to flow out from the grouting head 3, thereby realizing the post-grouting of the pile side and the pile end. At the same time, in order to prevent the slurry in the connecting pipe 2 from flowing back into the grouting pipe 1 during the process of adjusting the position of the grouting head 3 to align with the pile side and the pile end, a one-way valve structure 4 is set at the connection between the connecting pipe 2 and the grouting pipe 1.

[0038] Optionally, the one-way valve structure 4 may be a rubber valve protruding toward one side of the grouting pipe 1 , and a portion of the circumferential outer edge of the rubber valve is connected to the inner wall of the connecting pipe 2 .

[0039] That is, the rubber valve can only be opened from one side of the grouting pipe 1 to the side of the grouting head 3. When the pressure on the side of the grouting head 3 is greater than the pressure on the side of the grouting pipe 1, the rubber valve closes the connecting pipe 2. The rubber valve is a bowl-shaped structure, and the bowl mouth faces the side of the grouting head 3, so that it can withstand the larger pressure on the side of the grouting head 3.

[0040] In this example, if Figures 3 to 5 As shown, the one-way valve structure 4 includes a valve hole diaphragm 41 and a valve diaphragm 42. The valve hole diaphragm 41 is circumferentially connected to the inner wall of the connecting pipe 2. The valve hole diaphragm 41 is provided with a through hole 411 for allowing the slurry to flow; the valve diaphragm 42 is attached to the side of the valve hole diaphragm 41 close to the slurry outlet head 3, and a valve hole 421 is opened on the valve diaphragm 42. The valve hole 421 and the through hole 411 are staggered. When the slurry flows from the grouting pipe 1 to the slurry outlet head 3, there is a gap between the valve diaphragm 42 and the valve hole diaphragm 41. When the slurry flows from the slurry outlet head 3 to the grouting pipe 1, the valve diaphragm 42 fits with the valve hole diaphragm 41 to close the through hole 411.

[0041] It can be understood that the size of the valve hole diaphragm 41 is adapted to the inner diameter of the connecting pipe 2, and the valve hole diaphragm 41 is fixedly connected in the connecting pipe 2. The valve diaphragm 42 is attached to the valve hole diaphragm, and the valve hole 421 on the valve diaphragm 42 and the through hole 411 on the valve hole diaphragm 41 are arranged alternately. When the slurry flows from the above-mentioned grouting pipe 1 to the above-mentioned slurry outlet 3, at this time, the pressure on the side of the valve diaphragm 42 close to the valve hole diaphragm 41 is greater than the other side, and the slurry flows through the through hole 411 and the gap between the valve diaphragm 42 and the valve hole diaphragm 41, and then flows through the valve hole 421; when the slurry flows from the above-mentioned slurry outlet 3 to the above-mentioned grouting pipe 1, at this time, the pressure on the other side of the valve diaphragm 42 is greater than the one side of the valve hole diaphragm 41, and the valve diaphragm 42 closes the through hole 411, and the slurry cannot flow.

[0042] Furthermore, the through hole 411 is opened at the center of the valve hole diaphragm 41, and the plurality of valve holes 421 are arranged around the center of the valve diaphragm 42. A folding portion 422 is provided around the valve hole 421 for making the area formed by the plurality of valve holes 421 close the through hole 411 or keep away from the through hole 411.

[0043] That is to say, the folding portion 422 can make the area formed by the plurality of valve holes 421 close the through hole 411 or move away from the through hole 411 to close or open the through hole 411, and the approach or distance of the folding portion 422 is achieved by the flow of slurry.

[0044] Optionally, the valve diaphragm 42 is made of an elastic material, such as rubber, so that the valve diaphragm 42 can be elastically deformed to have a gap with the valve hole diaphragm 41. It should be noted that the valve hole diaphragm 41 is made of a non-elastic material.

[0045] In some optional embodiments, the connecting pipe 2 includes a connecting head 21 and a bellows 22, the connecting head 21 is connected to the grouting pipe 1, the one-way valve structure 4 is arranged in the connecting head 21, and the two ends of the bellows 22 are respectively connected to the connecting head 21 and the slurry outlet head 3, for adjusting the relative position of the slurry outlet head 3 relative to the grouting pipe 1.

[0046] It can be understood that the bellows 22 can flexibly adjust the angle, direction and position of the grouting head 3, so as to facilitate post-grouting of the pile side or pile end. Since the grout in the bellows 22 may flow back into the grouting pipe 1 during the bending process of the bellows 22, a one-way valve structure 4 is provided.

[0047] In some optional embodiments, such as Figure 2 As shown, the connector 21 is detachably connected to the grouting pipe 1 and the corrugated pipe 22 .

[0048] In this example, the side of the connector 21 connected to the grouting pipe 1 is provided with an external thread 211, and the side connected to the bellows 22 is provided with an internal thread 210, both of which are detachably connected to the grouting pipe 1 and the bellows 22 by threaded cooperation, thereby facilitating the maintenance and replacement of the bellows 22 and the slurry outlet head 3.

[0049] In some optional embodiments, such as Figure 6 As shown, the above-mentioned slurry discharge head 3 includes a slurry discharge pipe 31, a check valve 32 and a trumpet shield 33. The end of the slurry discharge pipe 31 away from the above-mentioned connecting pipe 2 is closed, and a plurality of slurry discharge holes 311 are circumferentially spaced on the side wall of the above-mentioned slurry discharge pipe 31; the check valve 32 is arranged on the above-mentioned slurry discharge hole 311 to prevent mud backflow; the trumpet shield 33 is sleeved on the outside of the above-mentioned slurry discharge pipe 31 to isolate the above-mentioned check valve 32 from the pile body, and a slurry discharge port 310 is formed between the large diameter end of the above-mentioned trumpet shield 33 and the above-mentioned slurry discharge pipe 31.

[0050] By setting the trumpet shield 33 and forming an annular slurry outlet between the trumpet shield 33 and the wall of the slurry outlet pipe 31, the accumulation of stones in the concrete and sediment around the slurry outlet hole is reduced to a certain extent, thereby greatly reducing the damage caused by stones to the check valve 32, improving the working reliability of the check valve 32, and reducing the risk of clogging of the grouting pipe. In addition, by setting the shield in a trumpet shape, the entry and accumulation of stones in the mud are further reduced, ensuring the working reliability of the check valve. In addition, by setting the trumpet shield 33, in the process of lowering the steel cage into the borehole, an annular cavity is formed between the inner wall of the trumpet shield 33 and the wall of the slurry outlet pipe 31, and the cavity is filled with mud. When pouring concrete, the conduit for filling concrete is placed in the hole filled with mud until it reaches the bottom of the hole, and then the concrete is pumped into the conduit. Since the bulk density of concrete is much greater than that of mud, the mud is gradually squeezed out as the concrete is driven in, and finally the mud in the hole is completely replaced by concrete, and the pile construction is completed. After a period of time, during the grouting process on the pile side and pile end, since the volume of the trumpet shield 33 is filled with mud, the cement slurry in the grouting pipe can easily open the check valve 32 during the post-grouting process, and the cement slurry flows out from the grout outlet 310, omitting the plugging step, thereby greatly simplifying the post-grouting process after pile formation and improving the pile formation efficiency. Moreover, the presence of mud inside the trumpet shield 33 allows the cement slurry in the grouting pipe to open the check valve 32 without a large pressure, thereby reducing the damage to the soil near the borehole caused by excessive water pressure, thereby enhancing the strength of the pile body.

[0051] In some optional embodiments, the check valve 32 includes a rubber pad 322 and a metal gasket 321. The rubber pad 322 is covered on the slurry outlet hole 311. The rubber pad 322 is fixedly connected to the pipe wall of the slurry outlet pipe 31, and the connection is close to the small diameter end of the horn guard 33. The metal gasket 321 is connected to the rubber pad 322 for sealing the slurry outlet hole 311.

[0052] It can be understood that the size of the metal gasket 321 is adapted to the size of the slurry outlet hole 311, so that the slurry outlet hole 311 is closed in cooperation with the rubber gasket 322. The part of the rubber gasket 322 close to the small diameter end of the horn shield 33 is connected to the side wall of the slurry outlet pipe 31, so that the metal gasket 321 can close or open the slurry outlet hole 311 through the rubber gasket 322, and the slurry can flow out of the slurry outlet hole 311 toward the large diameter end of the horn shield 33.

[0053] In some optional embodiments, the metal gasket 321 is connected and fixed to the rubber pad 322 via an outer adhesive tape 323 , and the rubber pad 322 is bonded and fixed to the pulp outlet head 3 .

[0054] In some optional embodiments, a plug 312 is provided at the closed end of the slurry outlet pipe 31 . The plug 312 may be a flat plate structure, and the outer end surface of the plug 312 is flush with the large end surface of the horn shield 33 .

[0055] When the pile side needs to be post-grouted, the plug 312 can be made to fit on the inner wall of the borehole. At this time, the large end face of the horn shield 33 also fits on the inner wall of the borehole. The cement slurry in the grouting pipe flows into the grouting pipe 31, flows out from the grouting hole 311, and then squeezes from the annular grouting port 310 to the inner wall of the borehole, thereby completing the post-grouting of the pile side. This arrangement of the plug 312 greatly reduces the accumulation of solidified concrete at the discharge port, so that the cement slurry in the grouting pipe can easily flush the concrete at the discharge port, which not only improves the reliability of the grouting head of this embodiment during the post-grouting process of the pile side, but also improves the post-grouting efficiency, thereby greatly shortening the pile forming time.

[0056] In other embodiments, the plug 312 may also be a conical structure, etc., for use in the post-grouting process of the pile end.

[0057] The working principle of the embodiment of the present application is as follows: the plug 312 is attached to the inner wall of the borehole. At this time, the large end face of the horn shield 33 is also attached to the inner wall of the borehole. The cement slurry in the grouting pipe flows from the above-mentioned grouting pipe 1 to the above-mentioned slurry outlet head 3. At this time, the pressure of the valve diaphragm 42 on the side close to the valve hole diaphragm 41 is greater than that on the other side. The slurry flows through the through hole 411 and the gap between the valve diaphragm 42 and the valve hole diaphragm 41, and then flows through the valve hole 421 to the slurry outlet pipe 31, and flows out from the slurry outlet hole 311, and then squeezes from the annular slurry outlet 310 to the inner wall of the borehole, thereby completing the pile side post-grouting. When the angle, direction and position of the slurry outlet head 3 are adjusted by the bellows 22, the slurry in the bellows 22 flows back. At this time, the pressure on the other side of the valve diaphragm 42 is greater than that on the side of the valve hole diaphragm 41. The valve diaphragm 42 closes the through hole 411, and the slurry cannot flow.

[0058] The present invention relates to a post-grouting one-way grouting head for pile foundation. A one-way valve structure 4 is provided at the connection between the connecting pipe 2 and the grouting pipe 1 to prevent the slurry in the connecting pipe 2 from flowing back into the grouting pipe 1 during the process of adjusting the position of the grouting head 3 to align with the pile side and the pile end; the slurry can only flow in one direction through the cooperation of the valve hole diaphragm 41 and the valve diaphragm 42; the angle, direction and position of the grouting head 3 can be flexibly adjusted by providing a bellows 22, so as to facilitate post-grouting of the pile side or the pile end; the connection with the grouting pipe 1 and the grouting pipe 1 is realized by threaded cooperation. The detachable connection of the bellows 22 facilitates the maintenance and replacement of the bellows 22 and the slurry outlet head 3; by setting the trumpet shield 33 and forming an annular slurry outlet between the trumpet shield 33 and the pipe wall of the slurry outlet pipe 31, the accumulation of gravel in concrete and sediment around the slurry outlet hole is reduced to a certain extent, thereby greatly reducing the damage caused by gravel to the check valve 32, improving the working reliability of the check valve 32, reducing the risk of grouting pipe being blocked, further reducing the entry and accumulation of gravel in the mud, and ensuring the working reliability of the check valve.

[0059] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0060] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0061] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A one-way grouting head for post-grouting of pile foundation, characterized in that: It comprises a grouting pipe (1), a connecting pipe (2) and a grouting head (3) which are connected in sequence, wherein the end of the grouting pipe (1) away from the connecting pipe (2) is used to communicate with a grouting pipe, and the end of the connecting pipe (2) connected to the grouting pipe (1) is provided with a one-way valve structure (4) to prevent the slurry in the connecting pipe (2) from flowing into the grouting pipe (1); The one-way valve structure (4) comprises: A valve hole diaphragm (41) connected to the inner wall of the connecting pipe (2) in its circumferential direction, and the valve hole diaphragm (41) is provided with a through hole (411) for allowing the slurry to flow; a valve diaphragm (42) attached to a side of the valve hole diaphragm (41) close to the slurry outlet head (3); a valve hole (421) is provided on the valve diaphragm (42); the valve hole (421) and the through hole (411) are arranged alternately; when slurry flows from the grouting pipe (1) to the slurry outlet head (3), a gap exists between the valve diaphragm (42) and the valve hole diaphragm (41); when slurry flows from the slurry outlet head (3) to the grouting pipe (1), the valve diaphragm (42) and the valve hole diaphragm (41) are attached to each other to close the through hole (411); The connecting pipe (2) comprises a connecting head (21) and a bellows (22); the connecting head (21) is connected to the grouting pipe (1); the one-way valve structure (4) is arranged in the connecting head (21); the two ends of the bellows (22) are respectively connected to the connecting head (21) and the slurry outlet head (3) for adjusting the relative position of the slurry outlet head (3) relative to the grouting pipe (1).

2. The pile foundation post-grouting one-way grouting head according to claim 1, characterized in that: The through hole (411) is opened at the center of the valve hole diaphragm (41), and the multiple valve holes (421) are arranged around the center of the valve diaphragm (42). A folding portion (422) is provided around the valve hole (421) to make the area formed by the multiple valve holes (421) close the through hole (411) or keep away from the through hole (411).

3. The pile foundation post-grouting one-way grouting head according to claim 1, characterized in that: The valve diaphragm (42) is made of elastic material.

4. The pile foundation post-grouting one-way grouting head according to claim 1, characterized in that: The connecting head (21) is detachably connected to the grouting pipe (1) and the corrugated pipe (22).

5. The pile foundation post-grouting one-way grouting head according to claim 1, characterized in that: The pulp outlet head (3) comprises: A pulp outlet pipe (31), one end of which is away from the connecting pipe (2) is closed, and a plurality of pulp outlet holes (311) are provided at intervals in the circumferential direction on the side wall of the pulp outlet pipe (31); A check valve (32), which is arranged at the slurry outlet (311) and is used to prevent the slurry from flowing back; A trumpet shield (33) is sleeved outside the slurry outlet pipe (31) and is used to isolate the check valve (32) from the pile body. A slurry outlet (310) is formed between the large-diameter end of the trumpet shield (33) and the slurry outlet pipe (31).

6. The pile foundation post-grouting one-way grouting head according to claim 5, characterized in that: The check valve (32) comprises: A rubber pad (322) is provided on the pulp outlet hole (311), the rubber pad (322) is fixedly connected to the pipe wall of the pulp outlet pipe (31), and the connection point is close to the small diameter end of the horn shield (33); A metal gasket (321) is connected to the rubber gasket (322) and is used to seal the slurry outlet hole (311).

7. The pile foundation post-grouting one-way grouting head according to claim 6, characterized in that: The metal gasket (321) is connected and fixed to the rubber pad (322) via an outer adhesive tape (323), and the rubber pad (322) is adhesively fixed to the pulp outlet head (3).

8. The pile foundation post-grouting one-way grouting head according to claim 1, characterized in that: The one-way valve structure (4) is a rubber valve protruding toward one side of the grouting pipe (1), and part of the outer edge of the rubber valve is connected to the inner wall of the connecting pipe (2).

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