A reinforcement device and method for soft soil in tidal flats

Abstract

The invention discloses a reinforcement device for tidal flat soft soil, comprising a vertical rotating grouting arm, which rotates along its own axis, an in-situ stirring curing agent grouting head is connected to the lower part of the rotating grouting arm, a curing agent conveying channel is arranged in the rotating grouting arm along the length direction, and the upper end of the curing agent conveying channel is connected to the outlet end of a curing agent supply and conveying device; this scheme significantly improves the smoothness of curing agent grouting.

Description

Technical Field

[0001] The invention belongs to the field of soft soil solidification. Background Art

[0002] In-situ solidification of soft soil or silt on tidal flats mainly involves direct solidification treatment on site of soft soil (such as sludge, silt, tidal flats, etc.), using soil solidifiers to solidify the soft soil in situ to form a composite stable base. After the solidifier is mixed with the soft soil, a series of physical and chemical reactions will be triggered, which will fix the water molecules in the soft soil in the form of crystal water, and the soil will be cemented to form a composite base with considerable bearing capacity.

[0003] In the process of solidifying the soft soil or silt on the tidal flat, the mixing head needs to be inserted deep into the soft soil; while the mixing head rotates, the curing agent is injected into the position of the mixing head and fully mixed with the soft soil. This step is the key to the solidification process, and it is necessary to ensure that the curing agent and the soft soil are mixed evenly to achieve the expected solidification effect; due to the insertion depth of the mixing head and the stubborn characteristics of the deep soft soil itself, the mixing head does not smoothly inject the curing agent into the deep soft soil and silt or is subject to strong resistance, which makes the injection amount of the curing agent uncontrollable, thus affecting the final solidification effect. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a device and method for reinforcing soft soil in tidal flats, which improves the smoothness of curing agent grouting.

[0005] Technical solution: To achieve the above-mentioned purpose, a reinforcement device for soft soil in tidal flats of the present invention comprises a vertical rotating grouting arm, which rotates along its own axis. An in-situ stirring curing agent grouting head is connected to the lower part of the rotating grouting arm. A curing agent delivery channel is arranged in the rotating grouting arm along the length direction. The upper end of the curing agent delivery channel is connected to the outlet end of the curing agent supply and delivery device.

[0006] Furthermore, a pointed tip is arranged at the lower end of the rotary grouting arm.

[0007] Furthermore, the in-situ stirring curing agent grouting head includes an upper stirring column and a lower stirring column coaxially sleeved on the lower part of the rotating grouting arm, and the distance between the upper stirring column and the lower stirring column forms a floating grouting space; the lower end side wall of the curing agent delivery channel is hollowed out in a circular array with a plurality of grouting ports.

[0008] Furthermore, the outer wall surface of the upper stirring column is spirally fixed with a first spiral blade, and the outer wall surface of the lower stirring column is spirally fixed with a second spiral blade; the upper end of the inner circle of the upper stirring column is provided with an upper internal thread body, and the lower end of the inner circle of the lower stirring column is provided with a lower internal thread body; the rotating grouting arm is provided with a first section of transmission thread at the height of the upper end of the upper stirring column, and the rotating grouting arm is provided with a second section of transmission thread at the height of the lower end of the lower stirring column; the upper internal thread body is threadedly matched with the first section of transmission thread, and the lower internal thread body is threadedly matched with the second section of transmission thread; a torsion transmission spring is coaxially arranged in the grouting space and is sleeved on the outside of the rotating grouting arm, and the upper and lower ends of the torsion transmission spring are respectively fixedly connected to the upper stirring column and the lower stirring column;

[0009] The first spiral blade and the second spiral blade have opposite spiral directions;

[0010] The spiral direction of the first transmission thread is opposite to that of the second transmission thread;

[0011] When the upper stirring cylinder and the lower stirring cylinder follow the rotating grouting arm and rotate synchronously in the "forward" direction along the axis, the first spiral blade conveys the nearby silt or soft soil upward, and the second spiral blade conveys the nearby silt or soft soil downward;

[0012] When the upper stirring cylinder and the lower stirring cylinder rotate "forward" relative to the rotating grouting arm, the upper stirring cylinder and the lower stirring cylinder move away from each other under the thread drive of the first section transmission thread and the second section transmission thread;

[0013] When the upper stirring cylinder and the lower stirring cylinder rotate "reversely" relative to the rotating grouting arm, the upper stirring cylinder and the lower stirring cylinder move closer to each other under the thread drive of the first section transmission thread and the second section transmission thread.

[0014] Furthermore, the first spiral blade and the second spiral blade are both provided with a plurality of stirring blades extending outward at equal intervals along the outer contour, and a stirring enhancement blade is vertically fixed on one side of each stirring blade.

[0015] Furthermore, an electric valve is provided at the height of the upper stirring column of the curing agent delivery channel; the lower end of the inner ring of the upper stirring column and the upper end of the inner ring of the lower stirring column are both provided with sealing rings that slide with the outer wall of the rotating grouting arm.

[0016] Furthermore, the in-situ stirring curing agent grouting head includes A form and B form:

[0017] In the A form, the upper stirring cylinder and the lower stirring cylinder are in a state of being close to each other, the grouting space is relatively narrow, and the upper stirring cylinder and the lower stirring cylinder form a combined stirring body in a state of being close to each other;

[0018] In the B form, the upper stirring column and the lower stirring column are in a state of being away from each other, the grouting space becomes thicker relative to the A form, and the upper stirring column and the lower stirring column are separated from each other.

[0019] Further, a curing agent grouting method for a reinforcement device for soft soil on a tidal flat:

[0020] Step 1: inserting the in-situ stirring curing agent grouting head of “A form” into a predetermined local position in the silt or soft soil layer;

[0021] Step 2: The curing agent supply and delivery device gradually delivers the fluid curing agent to the curing agent delivery channel, and at the same time, the driving device drives the rotating grouting arm to rotate "reversely" along the axis until the in-situ stirring curing agent grouting head enters the B shape;

[0022] Step 3, controlling the rotary grouting arm to rotate in the "positive direction" along the axis until the in-situ stirring curing agent grouting head of the B form is changed into the in-situ stirring curing agent grouting head of the A form;

[0023] Step 4, continue to control the rotary grouting arm to rotate in the "positive direction" along the axis. At the same time, the "A-form" in-situ stirring curing agent grouting head makes an overall stirring displacement up, down, front, back, left and right at its own position.

[0024] Beneficial effect: During the grouting process of the present invention, the upper stirring column and the lower stirring column move away from each other, so that the originally narrow grouting space gradually becomes thicker in the axial direction, and the volume of the grouting space gradually increases. The pressure of the grouting space becomes relatively smaller due to the gradual increase in volume, so that a plurality of grouting ports can inject the curing agent into the gradually increasing grouting space more smoothly and with lower resistance, so that the gradually increasing volume of the grouting space is gradually filled with the curing agent, thereby improving the smoothness of grouting. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the in-situ stirring curing agent grouting head in the B form in soft soil or silt;

[0026] Figure 2 The overall schematic diagram of the in-situ stirring curing agent grouting head of form B;

[0027] Figure 3 for Figure 2 A cross-sectional view of

[0028] Figure 4 This is a schematic diagram of disassembling the in-situ stirring curing agent grouting head;

[0029] Figure 5 It is a schematic diagram of the in-situ stirring curing agent grouting head switching between the A form and the B form;

[0030] Figure 6Schematic diagram of the upper stirring column structure. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] As attached Figures 1 to 6 A reinforcement device for soft soil on a tidal flat is shown in FIG. Figure 1 , including a vertical rotating grouting arm 4, the upper end of the rotating grouting arm 4 is rotatably mounted on the mechanical arm through a bearing, the mechanical arm can drive the rotating grouting arm 4 to move, and the mechanical arm is equipped with a hydraulic drive device that can drive the rotating grouting arm 4 to rotate along its own axis, the lower part of the rotating grouting arm 4 is coaxially connected with an in-situ stirring curing agent grouting head 40, a curing agent conveying channel 16 is arranged in the rotating grouting arm 4 along the length direction, and the upper end of the curing agent conveying channel 16 is connected to the outlet end of the curing agent supply and conveying device; the lower end of the rotating grouting arm 4 is provided with a pointed head 6, which can reduce the resistance during the insertion into soft soil.

[0033] like Figures 2 to 6 The in-situ stirring curing agent grouting head 40 shown includes an upper stirring column 7 and a lower stirring column 8 coaxially sleeved on the lower part of a rotating grouting arm 4, and the distance between the upper stirring column 7 and the lower stirring column 8 forms a floating grouting space 45; the lower end side wall of the curing agent delivery channel 16 is hollowed out in a circular array with a plurality of grouting ports 3; the outlet ends of the plurality of grouting ports 3 are connected to the central area of ​​the grouting space 45.

[0034] The outer wall of the upper stirring column 7 is spirally fixed with a first spiral blade 10, and the outer wall of the lower stirring column 8 is spirally fixed with a second spiral blade 11; the upper end of the inner circle of the upper stirring column 7 is provided with an upper internal thread body 19, and the lower end of the inner circle of the lower stirring column 8 is provided with a lower internal thread body 20; the rotary grouting arm 4 is provided with a first section of transmission thread 2 at the height of the upper end of the upper stirring column 7, and the rotary grouting arm 4 is provided with a second section of transmission thread 5 at the height of the lower end of the lower stirring column 8; the upper internal thread body 19 is threadedly matched with the first section of transmission thread 2, and the lower internal thread body 20 is threadedly matched with the second section of transmission thread 5; A torsion transfer spring 9 is coaxially arranged in the slurry space 45 and is sleeved on the rotating grouting arm 4. The upper and lower ends of the torsion transfer spring 9 are respectively fixedly connected to the upper stirring column 7 and the lower stirring column 8; while the torsion transfer spring 9 elastically expands and contracts adaptively along the axial direction, the torsion transfer spring 9 also plays a role in transmitting torque between the upper stirring column 7 and the lower stirring column 8; under the torsion transmission of the torsion transfer spring 9, the upper stirring column 7 and the lower stirring column 8 always tend to be consistent in the rotation direction; the spiral rotation direction of the first spiral blade 10 is opposite to that of the second spiral blade 11; the spiral rotation direction of the first section transmission thread 2 is opposite to that of the second section transmission thread 5.

[0035] like Figure 1 As shown:

[0036] When the upper stirring cylinder 7 and the lower stirring cylinder 8 follow the rotating grouting arm 4 and rotate synchronously in the "forward" direction along the axis, the first spiral blade 10 conveys the nearby silt or soft soil upward, and the second spiral blade 11 conveys the nearby silt or soft soil downward;

[0037] When the upper stirring column 7 and the lower stirring column 8 rotate together in the "positive direction" relative to the rotating grouting arm 4, the upper stirring column 7 and the lower stirring column 8 move away from each other under the thread drive of the first section transmission thread 2 and the second section transmission thread 5;

[0038] When the upper stirring column 7 and the lower stirring column 8 rotate "reversely" relative to the rotating grouting arm 4, the upper stirring column 7 and the lower stirring column 8 move closer to each other under the threaded transmission of the first section transmission thread 2 and the second section transmission thread 5.

[0039] The first spiral blade 10 and the second spiral blade 11 are both provided with a plurality of stirring blades 14 extending outward at equal intervals along the outer contour, and a stirring enhancement blade 15 is vertically fixed to one side of each stirring blade 14 .

[0040] A plurality of a stirring blades 21 are distributed in a circular array on the side where the upper stirring cylinder 7 and the lower stirring cylinder 8 are close to each other, and a plurality of b stirring blades 17 are distributed in a circular array on the side where the upper stirring cylinder 7 and the lower stirring cylinder 8 are far away from each other.

[0041] An electric valve 41 is provided at the height of the upper stirring column 7 of the curing agent delivery channel 16; the lower end of the inner ring of the upper stirring column 7 and the upper end of the inner ring of the lower stirring column 8 are both provided with a sealing ring 18 that slides with the outer wall of the rotating grouting arm 4.

[0042] The curing agent grouting method and working principle of the reinforcement device for the soft soil of the beach:

[0043] like Figure 5 The in-situ stirring curing agent grouting head 40 includes an A form and a B form:

[0044] In the A form, the upper stirring column 7 and the lower stirring column 8 are in a state of being close to each other, the grouting space 45 is relatively narrow, and the upper stirring column 7 and the lower stirring column 8 form a combined stirring body in a state of being close to each other;

[0045] In the B form, the upper stirring column 7 and the lower stirring column 8 are in a state of being away from each other, the grouting space 45 becomes thicker relative to the A form, and the upper stirring column 7 and the lower stirring column 8 are separated from each other;

[0046] The working method of the in-situ stirring curing agent grouting head 40 for grouting and mixing the silt or soft soil layer in a predetermined local area is as follows:

[0047] Step 1: The external mechanical arm drives the "A-shaped" in-situ stirring curing agent grouting head 40 through the vertical rotating grouting arm 4 and inserts it downward into a predetermined local position in the silt or soft soil layer;

[0048] In step 2, the curing agent supply and delivery device gradually delivers the fluid curing agent to the curing agent delivery channel 16, so that the fluid curing agent in the curing agent delivery channel 16 is squeezed out through a plurality of grouting ports 3; while the plurality of grouting ports 3 extrude the fluid curing agent, the hydraulic drive device drives the rotary grouting arm 4 to rotate "inversely" along the axis. Since the upper stirring column 7 and the lower stirring column 8 are surrounded by soft soil or silt with viscosity and low fluidity at this time, the upper stirring column 7 and the lower stirring column 8 will not follow the driving rotary grouting arm 4 to rotate synchronously "inversely" along the axis due to the obstruction of the soft soil or silt with viscosity and low fluidity nearby. According to the relative motion relationship, at this time, the upper stirring column 7 and the lower stirring column 8 are jointly relative to the rotary grouting The slurry arm 4 rotates in the "positive direction", so under the thread drive of the first section transmission thread 2 and the second section transmission thread 5, the upper stirring column 7 and the lower stirring column 8 move away from each other, so that the originally narrow grouting space 45 gradually becomes thicker in the axial direction, and the volume of the grouting space 45 gradually increases. The pressure of the grouting space 45 becomes relatively smaller due to the gradual increase in volume, so that the plurality of grouting ports 3 can more smoothly and with lower resistance inject the curing agent into the gradually increasing grouting space 45, so that the gradually increasing volume of the grouting space 45 is gradually filled with the curing agent, thereby improving the smoothness of grouting; until the in-situ stirring curing agent grouting head 40 enters the B form, the grouting process is completed, and at this time, the electric valve 41 is closed to stop grouting;

[0049] Step three, control the hydraulic drive device to drive the rotary grouting arm 4 to rotate in the "positive" direction along the axis. Since the upper stirring column 7 and the lower stirring column 8 are still surrounded by soft soil or silt with viscosity and low fluidity at this time, the upper stirring column 7 and the lower stirring column 8 will not follow the driving rotary grouting arm 4 to rotate synchronously in the "positive" direction along the axis due to the obstruction of the nearby soft soil or silt with viscosity and low fluidity. According to the relative motion relationship, the upper stirring column 7 and the lower stirring column 8 rotate "reversely" relative to the rotary grouting arm 4 at this time. Therefore, under the thread drive of the first section transmission thread 2 and the second section transmission thread 5, the upper stirring column 7 and the lower stirring column 8 are driven to rotate in the "positive" direction. The movement of approaching each other makes the grouting space 45 filled with the fluid curing agent gradually thinner in the axial direction, and the volume of the grouting space 45 gradually changes. As the volume of the grouting space 45 gradually decreases, the fluid curing agent filled is squeezed out to the surrounding area of ​​the waist of the in-situ stirring curing agent grouting head 40, until the B-shaped in-situ stirring curing agent grouting head 40 is changed to the A-shaped in-situ stirring curing agent grouting head 40. At this time, a circle of squeezed annular fluid curing agent is formed around the waist of the A-shaped in-situ stirring curing agent grouting head 40. At this time, the upper stirring column 7 and the lower stirring column 8 constitute a combined stirring body in a state of approaching each other;

[0050] Step 4, continue to control the hydraulic drive device to drive the rotary grouting arm 4 to rotate in the "positive direction" along the axis. At this time, since the upper stirring column 7 and the lower stirring column 8 of the A-shaped in-situ stirring curing agent grouting head 40 are already in a state of approaching each other, the upper stirring column 7 and the lower stirring column 8 cannot continue to move towards each other, so the upper stirring column 7 and the lower stirring column 8 will rigidly follow the rotary grouting arm 4 to rotate in the "positive direction" along the axis; the first spiral blade 10 spirally transmits the fluid curing agent around the waist of the A-shaped in-situ stirring curing agent grouting head 40 upward, and the second spiral blade 11 spirally transmits the A-shaped in-situ stirring curing agent grouting head 4 0 is spirally transmitted downward, so that the fluid curing agent originally concentrated around the waist of the A-shaped in-situ stirring curing agent grouting head 40 is spirally diffused in the upward and downward directions, and is blended and mixed with the surrounding silt or soft soil; at the same time, the external mechanical arm drives the "A-shaped" in-situ stirring curing agent grouting head 40 through the vertical rotating grouting arm 4 to make an overall stirring displacement up, down, front, back, left and right at its own position, so that the "A-shaped" in-situ stirring curing agent grouting head 40 that is continuously rotating "forward" can fully stir, mix and blend the nearby silt or soft soil with the locally injected fluid curing agent.

[0051] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A reinforcement device for soft soil on a tidal flat, characterized in that: The invention comprises a vertical rotating grouting arm (4), the rotating grouting arm (4) rotates along its own axis, the lower part of the rotating grouting arm (4) is connected to an in-situ stirring curing agent grouting head (40), a curing agent conveying channel (16) is arranged in the rotating grouting arm (4) along the length direction, and the upper end of the curing agent conveying channel (16) is connected to the outlet end of the curing agent supply and conveying device; The in-situ stirring curing agent grouting head (40) comprises an upper stirring column (7) and a lower stirring column (8) coaxially sleeved on the lower part of a rotating grouting arm (4), the spacing between the upper stirring column (7) and the lower stirring column (8) forming a floating grouting space (45); the lower end side wall of the curing agent delivery channel (16) is hollowed out with a plurality of grouting ports (3) in a circumferential array; The outer wall surface of the upper stirring column (7) is spirally fixed with a first spiral blade (10), and the outer wall surface of the lower stirring column (8) is spirally fixed with a second spiral blade (11); the upper end of the inner circle of the upper stirring column (7) is provided with an upper internal thread body (19), and the lower end of the inner circle of the lower stirring column (8) is provided with a lower internal thread body (20); the rotary grouting arm (4) is provided with a first transmission thread (2) at the height of the upper end of the upper stirring column (7), The rotary grouting arm (4) is provided with a second section of transmission thread (5) at the height of the lower end of the lower stirring column (8); the upper internal thread body (19) is threadedly matched with the first section of transmission thread (2), and the lower internal thread body (20) is threadedly matched with the second section of transmission thread (5); a torsion transmission spring (9) is coaxially provided in the grouting space (45) and is sleeved outside the rotary grouting arm (4); the upper and lower ends of the torsion transmission spring (9) are respectively fixedly connected to the upper stirring column (7) and the lower stirring column (8); The first spiral blade (10) and the second spiral blade (11) have opposite spiral directions; The first section of the transmission thread (2) and the second section of the transmission thread (5) have opposite spiral directions; When the upper stirring column (7) and the lower stirring column (8) follow the rotating grouting arm (4) and rotate synchronously in the "forward" direction along the axis, the first spiral blade (10) conveys the nearby silt or soft soil upward in a spiral, and the second spiral blade (11) conveys the nearby silt or soft soil downward in a spiral; When the upper stirring column (7) and the lower stirring column (8) rotate in a "positive direction" relative to the rotating grouting arm (4), the upper stirring column (7) and the lower stirring column (8) move away from each other under the thread drive of the first section transmission thread (2) and the second section transmission thread (5); When the upper stirring column (7) and the lower stirring column (8) rotate in the "reverse direction" relative to the rotating grouting arm (4), the upper stirring column (7) and the lower stirring column (8) move towards each other under the thread drive of the first section transmission thread (2) and the second section transmission thread (5).

2. A reinforcement device for soft soil on tidal flats according to claim 1, characterized in that: The lower end of the rotary grouting arm (4) is provided with a pointed head (6).

3. A reinforcement device for soft soil on tidal flats according to claim 2, characterized in that: The first spiral blade (10) and the second spiral blade (11) are both provided with a plurality of stirring blades (14) extending outward at equal intervals along the outer contour, and a stirring enhancement blade (15) is vertically fixed on one side of each stirring blade (14).

4. A reinforcement device for soft soil on tidal flats according to claim 3, characterized in that: An electric valve (41) is provided at the height of the upper stirring column (7) of the curing agent delivery channel (16); the lower end of the inner ring of the upper stirring column (7) and the upper end of the inner ring of the lower stirring column (8) are both provided with a sealing ring (18) that slidably cooperates with the outer wall of the rotating grouting arm (4).

5. The reinforcement device for soft soil in tidal flats according to claim 4, characterized in that: The in-situ stirring curing agent grouting head (40) includes an A form and a B form: In the A form, the upper stirring column (7) and the lower stirring column (8) are in a state of being close to each other, the grouting space (45) is relatively narrow, and the upper stirring column (7) and the lower stirring column (8) form a combined stirring body in a state of being close to each other; In the B form, the upper stirring column (7) and the lower stirring column (8) are in a state of being separated from each other, the grouting space (45) becomes thicker relative to the A form, and the upper stirring column (7) and the lower stirring column (8) are separated from each other.

6. The curing agent grouting method of the reinforcement device for soft soil in tidal flats according to claim 5 is characterized in that: Step 1, inserting the "A-shaped" in-situ stirring curing agent grouting head (40) into a predetermined local position in the silt or soft soil layer; Step 2: the curing agent supply and delivery device gradually delivers the fluid curing agent to the curing agent delivery channel (16), and at the same time, the driving device drives the rotating grouting arm (4) to rotate in the "reverse" direction along the axis until the in-situ stirring curing agent grouting head (40) enters the B shape; Step three, controlling the rotating grouting arm (4) to rotate in the "positive direction" along the axis until the in-situ stirring curing agent grouting head (40) in the B form is transformed into the in-situ stirring curing agent grouting head (40) in the A form; Step 4, continue to control the rotating grouting arm (4) to rotate in the "positive direction" along the axis, while at the same time the "A-shaped" in-situ stirring curing agent grouting head (40) performs an overall stirring displacement in the upward, downward, forward, backward, left and right directions at its own position.

Images