A shield pile grinding system for soft soil

Abstract

The present invention discloses a soft soil layer shield pile grinding equipment, including a shield cutterhead for shield excavation in soft soil layers, and a plurality of pile grinding mechanisms for grinding piles in soft soil layers are arranged in an array on the shield cutterhead; wherein; the pile grinding mechanism includes a mounting block mounted on the shield cutterhead, and a slide groove is provided on the mounting block. In the present invention, a water cutting head for cutting pile foundations is compositely mounted on a conventional shield cutterhead, and the water cutting head is driven to reciprocate along its diameter on the shield cutterhead through a reciprocating mechanism. Therefore, when the shield cutterhead encounters a pile foundation during excavation in the soft soil bottom layer, the water cutting head can be used to cut and crush the strong pile foundation, which can reduce the wear of the tool on the shield cutterhead on the one hand, and improve its utilization rate on the other hand due to the flexible movement of the water cutting head.

Description

Technical Field

[0001] The invention relates to the technical field of shield cutter discs, and in particular to a soft soil stratum shield pile grinding system. Background Art

[0002] Tunnel excavation using a shield machine is a commonly used construction method in urban subway and pipeline construction. Due to the existence of existing building pile foundations and existing underground pipelines, it is inevitable to cross some obstacles during the construction process, especially reinforced concrete piles.

[0003] For some obstacles with shallow pile foundations, the obstacles can be cleared by replacing or removing the pile foundation, and the shield machine can then pass normally. However, this method is not applicable to some strata with deep pile foundations or complex environments.

[0004] Moreover, the cutterhead of existing shield machines in soft soil layers does not have the ability to cut reinforced concrete, and rash advancement will cause significant damage to the cutterhead. Summary of the invention

[0005] The purpose of the present invention is to provide a soft soil layer shield pile grinding system to solve the technical problem that the soft soil layer shield machine in the prior art is inconvenient to clean the pile foundation on the travel path.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] A soft soil layer shield pile grinding equipment, comprising a shield cutterhead for shield tunneling in the soft soil layer, wherein a plurality of pile grinding mechanisms for grinding piles in the soft soil layer are arranged in an array on the shield cutterhead;

[0008] in;

[0009] The pile grinding mechanism comprises a mounting block mounted on the shield cutter head, a slide groove is provided on the mounting block, and a sliding seat is installed in the slide groove through a first guide mechanism and moves along the length direction of the slide groove;

[0010] A water cutting head for grinding piles is installed on the sliding seat, and a reciprocating mechanism for driving the sliding seat to slide back and forth in the sliding groove is provided on the shield cutter head.

[0011] As a preferred solution of the present invention, the water cutting head is connected to the chute wall via a second guide mechanism, the second guide mechanism comprises a second guide rod mounted on the water cutting head, a second guide rail is provided on the chute wall, and the second guide rod is slidably connected to the second guide rail;

[0012] in;

[0013] The water jet cutting head is rotatably mounted on the sliding seat via a pin shaft;

[0014] The second guide rail includes a horizontal portion in the middle section and bent portions at both ends of the horizontal portion, and the two bent portions are bent toward the inside of the slide groove, so that when the water cutting head slides on the bent portions, the water cutting head gradually opens outward at the slot of the slide groove, thereby increasing the grinding range of the water cutting head on the pile column.

[0015] As a preferred solution of the present invention, the water jet cutting head comprises a sleeve rotatably mounted on the sliding seat, and a water jet nozzle is slidably inserted into the sleeve via a second spring;

[0016] in;

[0017] Under the elastic force of the second spring, the tail end of the water jet nozzle is always slidably connected to the groove wall of the slide groove;

[0018] One end of the second guide rod is fixedly connected to the water jet nozzle.

[0019] As a preferred solution of the present invention, a third guide rail is provided on the wall of the chute, and the tail end of the water jet nozzle is always slidably connected to the third guide rail, and the third guide rail includes a straight portion in the middle section and inclined portions at both ends of the straight portion;

[0020] in;

[0021] The two sections of the inclined portions are inclined outward toward the slot opening. When the water jet cutting head slides on the bending portion, under the traction of the second guide rod, the sleeve gradually approaches the third guide rail. Under the pressure of the inclined portion, the water jet nozzle gradually moves away from the third guide rail, so that the distance between the water jet nozzle and the surface of the pile column is always equal.

[0022] As a preferred solution of the present invention, the reciprocating mechanism comprises a reciprocating screw rotatably mounted in a mounting block, a screw nut is threadedly sleeved on the reciprocating screw, and the screw nut is connected to the sliding seat via a connecting piece, and a driving mechanism for driving the reciprocating screw to rotate is provided on the shield cutter head;

[0023] Under the drive of the driving mechanism, the lead screw nut drives the sliding seat to slide back and forth in the sliding groove through the connecting member.

[0024] As a preferred solution of the present invention, a protective groove for installing the mounting block is provided on the shield cutter head, and the mounting block is rotatably connected to the protective groove, and an injection through hole facing the slide groove is provided between the protective groove and the side wall of the shield cutter head;

[0025] in;

[0026] The mounting block is a cylindrical structure;

[0027] The output shaft of the driving mechanism extends into the mounting block and is connected to the input end of the reciprocating screw, and a one-way bearing is rotatably mounted between the output shaft of the driving mechanism and the mounting block;

[0028] When the driving mechanism is started in the forward direction, the reciprocating screw rotates unidirectionally to drive the screw nut to move reciprocally. When the driving mechanism is started in the reverse direction, the mounting block rotates as a whole, so that the notch of the slide groove is misaligned with the injection through hole to prevent the water jet nozzle inside the slide groove from being worn by the outside world.

[0029] As a preferred solution of the present invention, the first guide mechanism includes a first guide rail arranged on the wall of the slide groove, and the sliding seat is slidably connected to the first guide rail through a first guide rod. Under the guidance of the first guide rail and the first guide rod, the sliding seat slides along the length direction of the slide groove to prevent the water jet nozzle's own reaction force from interfering with the movement of the sliding seat when the water jet nozzle is working.

[0030] As a preferred solution of the present invention, the connecting member comprises a fixed cylinder fixedly mounted on the sliding seat, a connecting rod is slidably mounted in the fixed cylinder via a first spring, one end of the connecting rod extends outside the fixed cylinder and is fixedly connected to the lead screw nut;

[0031] The elastic potential energy of the first spring is used to buffer the vibration between the sliding seat and the lead screw nut.

[0032] As a preferred solution of the present invention, the shield cutterhead is provided with a sensor for monitoring the vibration frequency of the shield cutterhead;

[0033] A control valve for controlling the opening or closing of the water jet nozzle is installed in the water jet nozzle, and a water storage mechanism for supplying water to the water jet nozzle is provided on the shield cutter head;

[0034] The shield cutterhead is also provided with a controller for receiving the monitoring signal of the sensor and controlling the opening or closing of the control valve, and the controller is also electrically connected to the input end of the driving mechanism.

[0035] In a second aspect of the present invention, a soft soil layer shield pile grinding method is provided, using the soft soil layer shield pile grinding equipment described above, comprising the following steps:

[0036] Step 100: The sensor monitors the working state of the shield cutter head. When the shield cutter head encounters a pile during its travel, the controller stops the travel of the shield cutter head.

[0037] Step 200: The controller controls the driving mechanism to output in a positive direction, so that the injection hole is directly opposite to the slide slot, thereby bringing out the water jet cutting head for grinding the pile column;

[0038] Step 300: The controller opens the control valve of the water jet nozzle, and grinds the pile column with the water jet nozzle. At the same time, the controller controls the reverse output of the driving mechanism, so that the water jet nozzle reciprocates along the diameter of the shield cutter disc, and the controller turns on the shield cutter disc to continue rotating and moving, thereby cutting the pile column into multiple sections.

[0039] Step 400: After the grinding of the pile column is completed, the controller controls the driving mechanism to output forward again, hiding the water jet nozzle in the protective groove.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] In the present invention, a water cutting head for cutting pile foundations is compositely installed on a conventional shield cutter disc, and the water cutting head is driven to reciprocate along its diameter on the shield cutter disc through a reciprocating mechanism. Therefore, when the shield cutter disc encounters a pile foundation during excavation in a soft soil bottom layer, the water cutting head can be used to cut and crush the strong pile foundation. On the one hand, the wear of the tool on the shield cutter disc can be reduced, and on the other hand, the flexible movement of the water cutting head also improves its utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0043] Figure 1 A schematic diagram of the appearance structure of a shield pile grinding device in soft soil is provided for an embodiment of the present invention;

[0044] Figure 2 A schematic diagram of a longitudinal cross-section structure of a soft soil shield pile grinding device is provided for an embodiment of the present invention;

[0045] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0046] Figure 4 A schematic diagram of a transverse cross-sectional structure of a shield pile grinding device for soft soil is provided for an embodiment of the present invention;

[0047] Figure 5 for Figure 4 The enlarged view of point B in the middle;

[0048] Figure 6 A structural schematic diagram of a connecting piece in a shield pile grinding device in a soft soil layer is provided for an embodiment of the present invention;

[0049] Figure 7 A schematic diagram of the cross-sectional structure of an installation block in a shield pile grinding device in a soft soil layer is provided for an embodiment of the present invention;

[0050] Figure 8 A structural schematic diagram of a water jet cutting head in a soft soil shield pile grinding device is provided for an embodiment of the present invention.

[0051] The numbers in the figure represent the following:

[0052] 1 shield cutter head, 2 protection groove, 3 mounting block, 4 reciprocating screw, 5 screw nut;

[0053] 6 connecting member, 601 fixing cylinder, 602 connecting rod, 603 first spring;

[0054] 7 sliding seat;

[0055] 8 water jet cutting head, 801 casing, 802 water jet nozzle, 803 second spring, 804 retaining ring;

[0056] 9 first guide mechanism, 901 first guide rod, 902 first guide rail;

[0057] 10 second guide mechanism, 1001 second guide rod, 1002 second guide rail;

[0058] 11 is a spray hole, 12 is a slide groove, 13 is a driving mechanism, and 14 is a one-way bearing. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] The existing soft soil shield machine has insufficient rigidity in its cutterhead and cannot cut the strong reinforced concrete pile foundation. Therefore, we propose a composite cutterhead that enables the soft soil shield machine to grind the reinforced concrete pile foundation. The specific structure is as follows:

[0061] like Figure 1 , Figure 2 and Figure 3As shown, the present invention provides a soft soil layer shield pile grinding equipment, including a shield cutter head 1 for shield tunneling in the soft soil layer, and a plurality of pile grinding mechanisms for grinding piles in the soft soil layer are arranged in an array on the shield cutter head 1;

[0062] in;

[0063] The pile grinding mechanism comprises a mounting block 3 mounted on the shield cutter head 1, a slide groove 12 is provided on the mounting block 3, and a sliding seat 7 is installed in the slide groove 12 through a first guide mechanism 9 and moves along the length direction of the slide groove 12;

[0064] A water jet cutting head 8 for grinding piles is mounted on the sliding seat 7 , and a reciprocating mechanism for driving the sliding seat 7 to slide back and forth in the slide groove 12 is provided on the shield cutter head 1 .

[0065] During the grinding process of the pile column, the water cutting head 8 is turned on, and the water cutting head 8 cuts the pile column. At the same time, the shield cutter head 1 and the reciprocating mechanism are turned on, and the water cutting head 8 reciprocates along the diameter of the shield cutter head 1. The shield cutter head 1 continues to rotate and advance, so that the pile column can be cut into multiple sections, which is convenient for the subsequent discharge of debris. The pile column is cut by the water cutting head 8 instead of the tool on the shield cutter head 1 used for shielding the soft soil bottom layer, thereby avoiding the wear of the tool on the shield cutter head 1.

[0066] Since the water cutting head 8 is located in the chute 12, and the moving stroke of the water cutting head 8 in the chute 12 is smaller than the diameter of the shield cutter disc 1, the circumference and center position of the shield cutter disc 1 are not within the range of the water cutting head 8. Therefore, there is a blind angle in the cutting of the pile column by the water cutting head 8, and the cutting of the pile column by the water cutting head 8 is not thorough enough.

[0067] Preferably, refer to Figure 3 and Figure 7 As shown, the water cutting head 8 is connected to the wall of the chute 12 via a second guide mechanism 10, the second guide mechanism 10 comprises a second guide rod 1001 mounted on the water cutting head 8, a second guide rail 1002 is provided on the wall of the chute 12, and the second guide rod 1001 is slidably connected to the second guide rail 1002;

[0068] in;

[0069] The water cutting head 8 is rotatably mounted on the inner wall of the sliding seat 7 via a pin shaft;

[0070] The second guide rail 1002 is located at the notch of the slide slot 12, and the front end of the water jet cutting head 8 extends outside the sliding seat 7 and is fixedly connected to the second guide rod 1001;

[0071] The second guide rail 1002 includes a horizontal portion in the middle section and bent portions at both ends of the horizontal portion, and the two bent portions are bent toward the inside of the slide groove 12. When the sliding seat 7 drives the water cutting head 8 to slide in the slide groove 12, the second guide rod 1001 guides the motion trajectory of the water cutting head 8.

[0072] in;

[0073] When the water cutting head 8 moves on the horizontal part of the second guide rail 1002, the front end of the water cutting head 8 performs vertical cutting on the surface of the pile column. When the water cutting head 8 moves on the bending part of the second guide rail 1002, the second guide rod 1001 drives the water cutting head 8 to rotate about the sliding seat 7 with the pin shaft as the central axis, and the front end of the water cutting head 8 is inclined toward the peripheral wall or center of the shield cutter disc 1. The minimum cutting stroke of the water cutting head 8 is the diameter length of the shield cutter disc 1. In this way, the grinding range of the water cutting head 8 on the pile column is increased, and the dead angle of the water cutting head 8 on the pile column is reduced.

[0074] When the sliding seat 7 slides in the slide groove 12 and the water cutting head 8 rotates relative to the sliding seat 7 under the guiding action of the second guide rail 1002 and the second guide rod 1001, the front end of the water cutting head 8 is equivalent to being gradually received in the slide groove 12, that is, the distance between the front end of the water cutting head 8 and the surface of the pile column is continuously increasing. In practice, the greater the distance between the water cutting head 8 and the pile column to be cut, the lower the cutting efficiency of the water cutting head 8 on the pile column, so that the water cutting head 8 does not cut the pile column uniformly, which also affects the movement of the shield cutter head 1.

[0075] Preferably, refer to Figure 8 The water jet cutting head 8 comprises a sleeve 801 rotatably mounted on the sliding seat 7 through a pin shaft, a water jet nozzle 802 slidably inserted in the sleeve 801, and a retaining ring 804 is fixedly connected to the peripheral wall of the water jet nozzle 802 and the inner wall of the sleeve 801, and a second spring 803 is provided between the two retaining rings 804;

[0076] in;

[0077] Under the elastic force of the second spring 803, the tail end of the water jet nozzle 802 is always slidably connected to the groove wall of the slide groove 12;

[0078] One end of the second guide rod 1001 is fixedly connected to the water jet nozzle 802 .

[0079] Reference Figure 4 , Figure 5 and Figure 7 As shown, a third guide rail is provided on the wall of the slide groove 12, and the tail end of the water jet nozzle 802 is always slidably connected to the third guide rail, and the third guide rail includes a straight portion in the middle section and inclined portions at both ends of the straight portion;

[0080] in;

[0081] The two inclined portions are inclined outward toward the notch of the slide groove 12. When the front end of the water jet nozzle 802 enters the bent portion along the horizontal portion, the rear end of the water jet nozzle 802 enters the inclined portion along the straight portion. Because the rear end of the water jet nozzle 802 is always against the third guide rail under the elastic force of the second spring 803, as the water jet nozzle 802 tilts, the front end of the water jet nozzle 802 gradually moves away from the pile surface. Under the pressure of the inclined portion of the third guide rail on the rear end of the water jet nozzle 802, the front end of the water jet nozzle 802 moves toward the pile surface relative to the sleeve 801, thereby compensating for the distance between the water jet nozzle 802 and the pile surface, making the distance between the water jet nozzle 802 and the pile surface stable, and improving the uniformity of the pile cutting by the water jet nozzle 802.

[0082] Reference Figure 2 , Figure 3 and Figure 4 As shown, in one embodiment, the reciprocating mechanism includes a reciprocating screw 4 rotatably installed in a mounting block 3, a screw nut 5 is threadedly sleeved on the reciprocating screw 4, and the screw nut 5 is connected to a sliding seat 7 by a connecting member 6, and a driving mechanism 13 for driving the reciprocating screw 4 to rotate is provided on the shield cutter head 1;

[0083] Driven by the driving mechanism 13, the reciprocating screw 4 rotates continuously, and the reciprocating screw 4 drives the screw nut 5 to move back and forth along the length direction of the reciprocating screw 4. The screw nut 5 drives the sliding seat 7 to slide back and forth in the slide groove 12 through the connecting piece 6, so as to realize the reciprocating cutting of the pile column by the water cutting head 8 on the sliding seat 7, and the specific structure of the reciprocating mechanism can be selected according to needs, such as a hydraulic rod. The electric telescopic rod as the main reciprocating mechanism is also applicable to this equipment.

[0084] The chute 12 on the mounting block 3 is directly opened and arranged on the surface of the shield cutter head 1. After the water cutting head 8 grinds the pile column, when the shield cutter head 1 continues to excavate, the soil debris in the soft soil layer can easily enter the chute 12, thereby causing wear to the sliding seat 7 and the water cutting head 8, thereby reducing the service life of the water cutting head 8.

[0085] Preferably, a protective groove 2 for installing the mounting block 3 is provided on the shield cutter head 1, and the mounting block 3 is rotatably connected to the protective groove 2, and an injection through hole 11 facing the chute 12 is provided between the protective groove 2 and the side wall of the shield cutter head 1, and the size of the injection through hole 11 is smaller than that of the chute 12, and the size of the injection through hole 11 is equivalent to the diameter of the water jet nozzle 802, so as to reduce the external soil debris from entering the chute 12;

[0086] in;

[0087] The mounting block 3 is a cylindrical structure, so the injection through hole 11 can be closed by the peripheral wall of the mounting block 3;

[0088] The output shaft of the driving mechanism extends into the mounting block 3 and is connected to the input end of the reciprocating screw 4 through a coupling. A one-way bearing 14 is rotatably installed between the output shaft of the driving mechanism and the mounting block 3. By setting the one-way bearing 14, the driving mechanism can drive the reciprocating screw 4 and the mounting block 3 to rotate respectively;

[0089] That is, when the driving mechanism 13 is started in the forward direction, under the action of the one-way bearing 14, the mounting block 3 remains stationary, and the reciprocating screw 4 rotates unidirectionally to drive the screw nut 5 to move back and forth, thereby driving the water cutting head 8 to work to cut the pile column. When the driving mechanism 13 is started in the reverse direction, under the action of the one-way bearing 14, the driving mechanism 13 drives the mounting block 3 to rotate as a whole, so that the notch of the slide groove 12 is misaligned with the injection through hole 11, so as to prevent the water jet nozzle 802 inside the slide groove 12 from being worn by the outside world, thereby improving the service life of the water cutting head 8.

[0090] Preferably, the first guide mechanism 9 includes a first guide rail 902 arranged on the wall of the slide groove 12, and the sliding seat 7 is slidably connected to the first guide rail 902 through a first guide rod 901. Under the guidance of the first guide rail 902 and the first guide rod 901, the sliding seat 7 slides along the length direction of the slide groove 12 to prevent the water jet nozzle 802's own reaction force from interfering with the movement of the sliding seat 7 when the water jet nozzle 802 is working.

[0091] Preferably, the connecting member 6 comprises a fixed cylinder 601 fixedly mounted on the sliding seat 7, a connecting rod 602 is slidably mounted in the fixed cylinder 601 via a first spring 603, one end of the connecting rod 602 extends out of the fixed cylinder 601 and is fixedly connected to the lead screw nut 5;

[0092] The elastic potential energy of the first spring 603 is used to buffer the vibration between the sliding seat 7 and the lead screw nut 5, thereby avoiding an overly rigid connection between the sliding seat 7 and the lead screw nut 5.

[0093] Preferably, a sensor for monitoring the vibration frequency of the shield cutterhead 1 is provided;

[0094] A control valve for controlling the opening or closing of the water jet nozzle 802 is installed in the water jet nozzle 802, and a water storage mechanism for supplying water to the water jet nozzle 802 is provided on the shield cutter head 1;

[0095] The shield cutter head 1 is also provided with a controller for receiving monitoring signals from the sensor and controlling the opening or closing of the control valve. The controller has a preset amplitude threshold. The sensor monitors the vibration amplitude of the shield cutter head 1 during actual operation in real time and transmits the monitoring signal to the controller. The controller has a preset amplitude threshold. When the actual amplitude measured by the sensor is greater than the preset amplitude threshold, it indicates that the soft soil layer ahead contains piles with higher hardness. The controller is also electrically connected to the input end of the driving mechanism 13, and the forward output or reverse output of the driving mechanism 13 is controlled by the controller.

[0096] A shield pile grinding method for soft soil strata comprises the following steps:

[0097] Step 100: The sensor monitors the working state of the shield cutter head. When the shield cutter head encounters a pile during its travel, the controller stops the travel of the shield cutter head.

[0098] Step 200: The controller controls the driving mechanism to output in a positive direction, so that the injection hole is directly opposite to the slide slot, thereby bringing out the water jet cutting head for grinding the pile column;

[0099] Step 300: The controller opens the control valve of the water jet nozzle, and grinds the pile column with the water jet nozzle. At the same time, the controller controls the reverse output of the driving mechanism, so that the water jet nozzle reciprocates along the diameter of the shield cutter disc, and the controller turns on the shield cutter disc to continue rotating and moving, thereby cutting the pile column into multiple sections.

[0100] Step 400: After the pile grinding is completed, the controller controls the driving mechanism to output forward again, hiding the water jet nozzle in the protective groove.

[0101] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A soft soil shield pile grinding equipment, characterized in that: It comprises a shield cutterhead (1) for shield tunneling in a soft soil layer, wherein a plurality of pile grinding mechanisms for grinding piles in the soft soil layer are arranged in an array on the shield cutterhead (1); in; The pile grinding mechanism comprises a mounting block (3) mounted on the shield cutter head (1), a slide groove (12) being provided on the mounting block (3), and a sliding seat (7) movable along the length direction of the slide groove (12) being installed in the slide groove (12) via a first guide mechanism (9); A water jet cutting head (8) for grinding piles is mounted on the sliding seat (7), and a reciprocating mechanism for driving the sliding seat (7) to slide back and forth in the slide groove (12) is provided on the shield cutter head (1); The water cutting head (8) is connected to the wall of the slide groove (12) via a second guide mechanism (10), the second guide mechanism (10) comprising a second guide rod (1001) mounted on the water cutting head (8), a second guide rail (1002) is provided on the wall of the slide groove (12), and the second guide rod (1001) is slidably connected to the second guide rail (1002); in; The water cutting head (8) and the sliding seat (7) are rotatably mounted via a pin; The second guide rail (1002) comprises a horizontal portion in the middle section and bent portions at both ends of the horizontal portion, and the two bent portions are bent toward the inside of the slide groove (12), so that when the water cutting head (8) slides on the bent portions, the water cutting head (8) gradually opens outward at the notch of the slide groove (12), thereby increasing the grinding range of the water cutting head (8) on the pile column; The water jet cutting head (8) comprises a sleeve (801) rotatably mounted on the sliding seat (7), and a water jet nozzle (802) is slidably inserted into the sleeve (801) via a second spring (803); in; Under the elastic force of the second spring (803), the tail end of the water jet nozzle (802) is always slidably connected to the groove wall of the slide groove (12); One end of the second guide rod (1001) is fixedly connected to the water jet nozzle (802); A third guide rail is provided on the wall of the slide groove (12), and the tail end of the water jet nozzle (802) is always slidably connected to the third guide rail, and the third guide rail comprises a straight portion in the middle section and inclined portions at both ends of the straight portion; in; The two sections of the inclined portions are inclined outwardly toward the notch of the slide groove (12), and when the water jet cutting head (8) slides on the bent portion, under the traction of the second guide rod (1001), the sleeve (801) gradually approaches the third guide rail, and under the pressure of the inclined portion, the water jet nozzle (802) gradually moves away from the third guide rail, so that the distance between the water jet nozzle (802) and the surface of the pile column is always equal; The reciprocating mechanism comprises a reciprocating screw (4) rotatably mounted in a mounting block (3), a screw nut (5) being threadedly sleeved on the reciprocating screw (4), and the screw nut (5) is connected to the sliding seat (7) via a connecting piece (6), and a driving mechanism (13) for driving the reciprocating screw (4) to rotate is provided on the shield cutter head (1); Under the drive of the driving mechanism (13), the lead screw nut (5) drives the sliding seat (7) to slide back and forth in the sliding groove (12) via the connecting member (6); The shield cutter head (1) is provided with a protection groove (2) for mounting the mounting block (3), and the mounting block (3) is rotatably connected to the protection groove (2), and an injection through hole (11) facing the slide groove (12) is provided between the protection groove (2) and the side wall of the shield cutter head (1); in; The mounting block (3) is a cylindrical structure; The output shaft of the drive mechanism extends into the mounting block (3) and is connected to the input end of the reciprocating screw (4), and a one-way bearing (14) is rotatably mounted between the output shaft of the drive mechanism and the mounting block (3); When the driving mechanism (13) is started in the forward direction, the reciprocating screw (4) rotates unidirectionally to drive the screw nut (5) to move back and forth. When the driving mechanism (13) is started in the reverse direction, the mounting block (3) rotates as a whole, so that the notch of the slide groove (12) is misaligned with the injection through hole (11), so as to prevent the water jet nozzle (802) inside the slide groove (12) from being worn by the outside.

2. The soft soil shield pile grinding equipment according to claim 1, characterized in that: The first guide mechanism (9) comprises a first guide rail (902) arranged on the wall of a slide groove (12); the sliding seat (7) is slidably connected to the first guide rail (902) via a first guide rod (901); under the guidance of the first guide rail (902) and the first guide rod (901), the sliding seat (7) slides along the length direction of the slide groove (12) to prevent the water jet nozzle (802) from causing interference to the movement of the sliding seat (7) due to its own reaction force when the water jet nozzle (802) is working.

3. The soft soil shield pile grinding equipment according to claim 1, characterized in that: The connecting member (6) comprises a fixed cylinder (601) fixedly mounted on a sliding seat (7), a connecting rod (602) being slidably mounted in the fixed cylinder (601) via a first spring (603), one end of the connecting rod (602) extending outside the fixed cylinder (601) and fixedly connected to the lead screw nut (5); The elastic potential energy of the first spring (603) is used to buffer the vibration between the sliding seat (7) and the lead screw nut (5).

4. The soft soil shield pile grinding equipment according to claim 1, characterized in that: The shield cutterhead (1) is provided with a sensor for monitoring the vibration frequency of the shield cutterhead; A control valve for controlling the opening or closing of the water jet nozzle (802) is installed in the water jet nozzle (802), and a water storage mechanism for supplying water to the water jet nozzle (802) is provided on the shield cutter head (1); The shield cutterhead (1) is also provided with a controller for receiving the monitoring signal of the sensor and controlling the opening or closing of the control valve, and the controller is also electrically connected to the input end of the driving mechanism (13).

5. A shield pile grinding method for soft soil strata, characterized in that: The soft soil shield pile grinding equipment according to any one of claims 1 to 4 is used, comprising the following steps: Step 100: The sensor monitors the working state of the shield cutter head. When the shield cutter head encounters a pile during its travel, the controller stops the travel of the shield cutter head. Step 200: The controller controls the driving mechanism to output in a positive direction, so that the injection hole is directly opposite to the slide slot, thereby bringing out the water jet cutting head for grinding the pile column; Step 300: The controller opens the control valve of the water jet nozzle, and grinds the pile column with the water jet nozzle. At the same time, the controller controls the reverse output of the driving mechanism, so that the water jet nozzle reciprocates along the diameter of the shield cutter disc, and the controller turns on the shield cutter disc to continue rotating and moving, thereby cutting the pile column into multiple sections. Step 400: After the grinding of the pile column is completed, the controller controls the driving mechanism to output forward again, hiding the water jet nozzle in the protective groove.

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