Shield tunnel supporting surface grouting equipment based on undercrossing trunk canal

Abstract

The invention relates to shield tunnel supporting surface grouting equipment based on an underpass trunk canal in the technical field of tunnel supporting surface grouting, which comprises a hopper, a material storage barrel, a material pushing hydraulic cylinder and a swing elbow structure, and further comprises a transition taper pipe mounted between the discharge end of the swing elbow structure and a grouting hose; the material supplementing barrel is communicated with the upper side of the transition taper pipe through a material supplementing square pipe, a material supplementing pressing plate capable of moving up and down is arranged in an inner cavity of the material supplementing barrel and used for enabling the material supplementing pressing plate to move downwards to extrude slurry in the material supplementing barrel to be supplemented into the transition pipe during the swing period of the swing bent pipe structure, and the purpose of continuous and stable grouting is achieved; through the linkage design of the material supplementing barrel and the eccentric turning plate, when the material storage barrel is switched to supply materials, the material supplementing pressing plate automatically moves downwards to reversely press stored slurry into the transition taper pipe, continuous material supplementing is achieved, grouting pressure fluctuation is remarkably reduced, and surface upheaval or settlement caused by sudden pressure change is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel support face grouting, and in particular to a shield tunnel support face grouting device based on underpass main canal. Background Art

[0002] When a shield tunnel passes through the South-to-North Water Diversion Canal, slurry needs to be injected into the shield tunnel support surface through grouting equipment to enhance the stability of the surrounding rock and prevent collapse and water seepage. The entire slurry needs to be delivered into the shield tunnel by an external pump truck, and the slurry entering the shield tunnel needs to be added with cement, bentonite, water glass, etc. in its secondary mixer before it can be pumped to the grouting position on the shield machine through the grouting equipment. Then the shield machine will inject the slurry into the shield tunnel support surface.

[0003] For shield tunnels, the internal space of the entire shield machine is limited, and a conical grouting pump is generally used to supply the slurry. During the entire feeding process, multiple storage barrels are generally used to alternately feed the slurry, such as Figure 1-2 As shown, it includes a hopper, one side of the hopper has a discharge pipe, and the other side is connected to two storage barrels and a matching push hydraulic cylinder. The inner cavity of the hopper has a swing elbow structure, the rotating end of the swing elbow structure is connected to the discharge pipe, and the swing end is alternately connected to the two storage barrels. However, the alternating feeding of the two storage barrels will make the slurry flow in the grouting hose unstable, which will lead to fluctuations in the grouting pressure. When the grouting pressure is too large, it will cause the surface in front of the support face to bulge, and when the grouting pressure is too small, it will cause the surface to settle. In addition, the existing grouting equipment also has the risk of water hammer and even rupture of the grouting hose when the grouting hose or the grouting position is blocked.

[0004] To this end, we designed a shield tunnel support face grouting equipment based on passing through the main canal. Summary of the invention

[0005] In order to overcome the deficiencies in the background technology, the present invention discloses a shield tunnel support face grouting device based on underpass main canal.

[0006] To achieve the above object, the present invention adopts the following technical solution: A shield tunnel support face grouting device based on passing through a main canal, comprising a hopper, one side of the hopper is provided with a discharge pipe, the other side of the hopper is connected with two storage barrels and a matching push hydraulic cylinder, the inner cavity of the hopper has a swing elbow structure, the rotating end of the swing elbow structure is connected to the discharge pipe, and the swing end is alternately connected to the two storage barrels, and is characterized in that: it also includes: A transition cone pipe is installed between the discharge pipe and the grouting hose; A feeding cylinder is connected to the upper side of the transition cone tube through a feeding square tube. The inner cavity of the feeding cylinder is provided with a feeding pressure plate that can move up and down. When the swing elbow structure swings, the feeding pressure plate moves down to squeeze out the slurry in the feeding cylinder to supplement the transition tube, so as to achieve the purpose of continuous and stable grouting. The eccentric flap is hinged inside the feeding square tube. The hinge axis of the eccentric flap deviates from the axis of the feeding square tube. The eccentric flap automatically adjusts its opening according to the slurry flow direction and is used to control the slurry flow path and flow rate between the feeding cylinder and the transition cone tube.

[0007] Preferably, the hinge axis of the eccentric flap is located on the axis of the feed square tube, which is biased towards the feed inlet side of the transition cone tube, so that when the slurry flows in the forward direction, the eccentric flap is pushed by the fluid to flip upward, allowing only the slurry to flow into the feed tube through its top gap; when flowing in the reverse direction, the eccentric flap flips downward to completely open the flow cross-section of the feed square tube.

[0008] Preferably, the inner cavity of the feeding barrel is provided with a guide shaft passing through the middle of the feeding pressure plate, the lower plate surface of the feeding pressure plate is provided with a stirring shaft along its circumference, and a spiral matching structure is provided between the feeding pressure plate and the guide shaft body, and the stirring shaft produces a periodic stirring effect on the slurry during the up and down movement of the feeding pressure plate.

[0009] Preferably, the stirring shaft body is evenly surrounded by a plurality of stirring blades.

[0010] Preferably, the stirring shaft comprises a plurality of shaft bodies stacked in sequence, and a plurality of stirring blades are evenly arranged around the bottom of the shaft body.

[0011] Preferably, a spring is provided at a position of the guide shaft body above the material feeding pressure plate.

[0012] Preferably, the upper end of the guide shaft extends out of the feeding cylinder, so that the pressure in the transition cone tube rises suddenly, the slurry quickly flows into the feeding cylinder through the gap at the top of the eccentric flap, and the feeding pressure plate is pushed open to release the pressure.

[0013] Preferably, a maintenance plate is detachably mounted in the middle of the feeding platen.

[0014] Preferably, the grouting method of the grouting equipment comprises the following steps: Grouting stage: The slurry in the storage barrel is pushed by the pusher hydraulic cylinder and transported to the transition cone through the swing elbow and connecting pipe, and finally injected into the shield tunnel support surface; Pressure holding stage: During the continuous output of slurry, part of the slurry flows into the feeding cylinder through the feeding square tube, pushing the feeding pressure plate upward to store the compensation slurry; Switching feeding stage: When the storage barrel is emptied, the swing elbow structure switches to another storage barrel, the feeding pressure plate moves down, and the stored slurry is pressed into the transition cone in the reverse direction to maintain the grouting pressure stable; Anti-blocking stage: If the grouting hose is blocked, the pressure in the transition cone will rise suddenly, and the slurry will quickly flow into the feeding barrel through the gap at the top of the eccentric flap until the pressure is balanced.

[0015] Preferably, the grouting method of the grouting equipment comprises the following steps: Grouting stage: The slurry in the storage barrel is pushed by the pusher hydraulic cylinder and transported to the transition cone through the swing elbow and connecting pipe, and finally injected into the shield tunnel support surface; Pressure holding stage: During the continuous output of slurry, part of the slurry flows into the feeding cylinder through the feeding square tube, pushing the feeding pressure plate upward and squeezing the spring to store pressure compensation energy; Switching feeding stage: When the storage barrel is emptied, the swing elbow structure switches to another storage barrel. At the same time, the spring extends, driving the feeding pressure plate to move downward, and the stored slurry is reversely pressed into the transition cone to maintain stable grouting pressure; Anti-blocking stage: If the grouting hose is blocked, the pressure in the transition cone will rise suddenly, and the slurry will quickly flow into the feeding tube through the gap at the top of the eccentric flap, and the feeding pressure plate will be pushed open to release the pressure; Stirring stage: During the up and down movement of the feeding pressure plate, the feeding pressure plate drives the stirring shaft to rotate under the action of the guide shaft to stir the slurry to prevent the slurry in the feeding barrel from settling and separation.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the linkage design of the feeding cylinder and the eccentric flap, when the storage cylinder switches the feeding, the feeding pressure plate automatically moves down to press the stored slurry into the transition cone in the opposite direction, realizing uninterrupted feeding and significantly reducing the grouting pressure fluctuation (the fluctuation range can be controlled within ±0.2 MPa), avoiding the surface uplift or settlement caused by sudden pressure changes; 2. The hinge axis offset design of the eccentric flap enables it to automatically adjust the opening according to the slurry flow direction. When the grouting hose is blocked, the pressure in the transition cone rises suddenly, and the slurry quickly flows into the feeding tube through the gap at the top of the eccentric flap (preferably 3-8mm), pushing open the feeding pressure plate to release the pressure, effectively eliminating the water hammer effect and reducing the risk of hose rupture; 3. The feeding pressure plate is connected to the guide shaft and the stirring shaft. During the up and down movement, it drives the stirring shaft to periodically stir the slurry, breaking the static retention state of the slurry, preventing the cement, bentonite and other components from settling and separating due to gravity, and ensuring the consistency of the grouting material performance; 4. The elastic potential energy of the spring replaces the traditional counterweight, significantly reducing the structural weight of the feeding platen and reducing the volume of the feeding cylinder by about 30%. It is more suitable for installation in the narrow space inside the shield machine and is suitable for complex working conditions such as the South-to-North Water Diversion Canal Underpass Project. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a structural schematic diagram of a grouting device in the prior art; Figure 2 It is a structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the first structure of the hopper, transition cone and feeding cylinder in the present invention; Figure 4 It is a cross-sectional view of the first structure of the hopper, transition cone and feeding cylinder in the present invention; Figure 5 It is a schematic diagram of the second structure of the hopper, transition cone and feeding cylinder in the present invention; Figure 6 It is a cross-sectional view of the second structure of the hopper, transition cone and feeding cylinder in the present invention; Figure 7 It is a cross-sectional view of the third structure of the hopper, transition cone and feeding barrel in the present invention.

[0018] In the figure: 1. hopper; 11. discharge pipe; 2. swing elbow structure; 3. push hydraulic cylinder; 4. storage barrel; 5. transition cone pipe; 6. feeding square pipe; 61. eccentric flap; 7. feeding barrel; 71. feeding pressure plate; 72. guide shaft; 73. stirring shaft; 731. shaft body; 74. stirring blade; 75. spring; 76. maintenance pressure plate. DETAILED DESCRIPTION

[0019] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present application and are for the convenience of describing the present invention; it should be understood that if there are terms such as "end", "side", "end portion", "lateral", "lateral", "transverse", "longitudinal", etc. indicating directions or positional relationships, they only correspond to the length and width of the corresponding components, that is, the "end portion" indicates the head and tail areas in the length direction of the corresponding component, and the "side portion" indicates the head and tail areas in the width direction of the corresponding component; this is for the convenience of describing the present invention and is not to indicate or imply that the device or element referred to must have a specific direction.

[0020] Embodiment 1, in combination with the attached Figure 2-4 A shield tunnel support face grouting equipment based on passing through a main canal includes a hopper 1, one side of the hopper 1 is provided with a discharge pipe 11, and the other side is connected with two storage barrels 4 and a push hydraulic cylinder 3 matched therewith. The inner cavity of the hopper 1 has a swing elbow structure 2, and the rotating end of the swing elbow structure 2 is connected to the discharge pipe 11, and the swinging end is alternately connected to the two storage barrels 4; it should be noted that: the swing elbow structure 2, the hopper 1, the push hydraulic cylinder 3 and the storage barrel 4 all adopt the existing technology, which will not be repeated here.

[0021] Also includes: The transition cone 5 is installed between the discharge pipe 11 and the grouting hose; Furthermore, the outlet end of the transition cone 5 adopts a conical design, the outlet end is connected to the grouting hose, and the inlet end is connected to the swing elbow structure 2. In other words, the transition cone 5 can be well assembled without changing the original equipment structure.

[0022] A feeding square tube 6 is provided on the upper side of the transition cone tube.

[0023] The feeding cylinder 7 is vertically installed above the feeding square tube 6. The inner cavity of the feeding cylinder 7 is provided with a feeding pressing plate 71 which can move up and down. When the swing elbow structure 2 swings, the feeding pressing plate 71 moves down to squeeze out the slurry in the feeding cylinder 7 to supplement the transition pipe, so as to achieve the purpose of continuous and stable grouting. As required, a sealing structure is provided between the feeding pressure plate 71 and the inner wall of the feeding cylinder 7 to ensure the continuity of the slurry pressure transmission in the feeding cylinder 7. The sealing structure adopts a rubber sealing ring or the like in the prior art, which is not specifically limited or elaborated here.

[0024] The eccentric flap 61 is hinged inside the feeding square tube 6, and the hinge axis of the eccentric flap 61 deviates from the axis of the feeding square tube 6. The eccentric flap 61 automatically adjusts its opening according to the slurry flow direction, and is used to control the slurry flow path and flow rate between the feeding cylinder 7 and the transition cone tube.

[0025] Furthermore, the hinge axis of the eccentric flap 61 is located on the axis of the feeding square tube 6, which is biased toward the feeding side of the transition cone tube 5, so that when the slurry flows in the forward direction, the eccentric flap 61 is pushed by the fluid to flip upward, allowing only the slurry to flow into the feeding tube 7 through its top gap; when flowing in the reverse direction, the eccentric flap 61 flips downward to completely open the flow cross-section of the feeding square tube 6.

[0026] It should be noted that the gap at the top of the eccentric flap 61 can be understood as the gap between the top of the eccentric flap 61 and the corresponding side wall of the feeding square tube 6 , or the cross-section of the feeding square tube 6 that is not blocked by the eccentric flap 61 .

[0027] Specifically, when the slurry flows forward, the eccentric flap 61 is pushed by the fluid to flip upward and remains in an up-and-down tilted state, with its bottom abutting against the corresponding side wall of the feed square tube 6 and a gap between its top and the corresponding side wall of the feed square tube 6.

[0028] It should be noted that the forward flow of the slurry can be understood as the pushing hydraulic cylinder 3 is in the pushing operation, and the slurry in the transition cone 5 flows into the feeding cylinder 7; similarly, the reverse flow of the slurry is the slurry in the feeding cylinder 7 flows into the transition cone 5.

[0029] Preferably, the inner cross-sectional area of ​​the feeding square tube 6 is the same as that of the grouting hose, and the hinge axis of the eccentric flap 61 deviates from the axis of the feeding square tube 6 by 15-20 mm; the top gap of the eccentric flap 61 is 3-8 mm.

[0030] The grouting method of this embodiment comprises: Grouting stage: The slurry in the storage tube 4 is pushed by the push hydraulic cylinder 3 and transported to the transition cone through the swing elbow and the connecting pipe, and finally injected into the shield tunnel support surface; Pressure holding stage: During the continuous output of the slurry, part of the slurry flows into the feeding cylinder 7 through the feeding square tube 6, pushing the feeding pressure plate 71 upward to store the compensation slurry; Switching feeding stage: when the storage barrel 4 is emptied, the swing elbow structure 2 switches to another storage barrel 4, and the feeding pressure plate 71 moves downward to press the stored slurry into the transition cone in the reverse direction to maintain the grouting pressure stable; Anti-blocking stage: If the grouting hose is blocked, the pressure in the transition cone suddenly rises, and the slurry quickly flows into the feeding tube 7 through the gap at the top of the eccentric flap 61 until the pressure is balanced. If necessary, a pressure sensor (not shown) can be installed at the outlet of the transition cone to monitor the grouting pressure in real time and feed it back to the control system.

[0031] Embodiment 2, combined with the attached Figure 5-6 , a shield tunnel support face grouting equipment based on passing through the main canal, based on the first embodiment, a guide shaft 72 is provided in the inner cavity of the feeding tube 7 to penetrate the middle part of the feeding pressure plate 71, a stirring shaft 73 is provided along the circumference of the lower plate surface of the feeding pressure plate 71, and a spiral matching structure is provided between the feeding pressure plate 71 and the guide shaft 72, and the stirring shaft 73 produces a periodic stirring effect on the slurry during the up and down movement of the feeding pressure plate 71.

[0032] As needed, combine with Figure 6-7 A plurality of stirring blades 74 are evenly arranged around the stirring shaft 73 .

[0033] Furthermore, the spiral matching structure includes a spiral groove arranged on the shaft body of the guide shaft 72, and the material feeding pressure plate 71 is provided with a center hole sleeved on the shaft body of the guide shaft 72, and the wall of the center hole is provided with a spiral sliding part matching the spiral groove.

[0034] That is, when the feeding pressure plate 71 moves, the feeding pressure plate 71 drives the stirring shaft 73 to move in a circular motion to produce a periodic stirring effect on the slurry, thereby preventing the slurry in the feeding cylinder 7 from settling and separating.

[0035] Furthermore, in order to ensure that the slurry in the upper and lower parts of the feeding barrel 7 is stirred, the stirring shaft 73 includes a plurality of shaft bodies 731 stacked in sequence, and a plurality of stirring blades 74 are evenly arranged around the bottom of the shaft body 731.

[0036] In this embodiment, a maintenance pressing plate 76 is detachably installed in the middle of the feeding pressing plate 71 .

[0037] The grouting method of this embodiment comprises: Grouting stage: The slurry in the storage tube 4 is pushed by the push hydraulic cylinder 3 and transported to the transition cone through the swing elbow and the connecting pipe, and finally injected into the shield tunnel support surface; Pressure holding stage: During the continuous output of the slurry, part of the slurry flows into the feeding cylinder 7 through the feeding square tube 6, pushing the feeding pressure plate 71 upward to store the compensation slurry; Switching feeding stage: when the storage barrel 4 is emptied, the swing elbow structure 2 switches to another storage barrel 4, and the feeding pressure plate 71 moves downward to press the stored slurry into the transition cone in the reverse direction to maintain the grouting pressure stable; Anti-blocking stage: If the grouting hose is blocked, the pressure in the transition cone will rise suddenly, and the slurry will quickly flow into the feeding tube 7 through the gap at the top of the eccentric flap 61 until the pressure is balanced.

[0038] Stirring stage: during the up and down movement of the feeding pressing plate 71 , the feeding pressing plate 71 drives the stirring shaft 73 to rotate under the action of the guide shaft 72 to stir the slurry, thereby preventing the slurry in the feeding cylinder 7 from settling and separating.

[0039] Embodiment 3, in combination with the attached Figure 7 , a shield tunnel support face grouting equipment based on passing through the main canal. Since the feeding pressure plate 71 in implementation one and two requires a larger weight, the difference from implementation one or two is that a spring 75 is provided on the shaft body of the guide shaft 72 located above the feeding pressure plate 71.

[0040] In this way, the weight of the feeding pressure plate 71 can be replaced by the elastic potential energy of the spring 75, which can effectively reduce the volume of the feeding cylinder 7.

[0041] As required, the upper end of the guide shaft 72 extends out of the feeding cylinder 7 to facilitate a sudden increase in pressure in the transition cone 5, and the slurry quickly flows into the feeding cylinder 7 through the gap at the top of the eccentric flap 61, pushing open the feeding pressure plate 71 to release the pressure.

[0042] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the above-mentioned embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the content of the claims involved.

Claims

1. A shield tunnel support face grouting device based on passing through a main canal, comprising a hopper (1), one side of the hopper (1) having a discharge pipe (11), and the other side of the hopper (1) being connected to two storage barrels (4) and a pusher hydraulic cylinder (3) matched therewith, the inner cavity of the hopper (1) having a swing elbow structure (2), the rotating end of the swing elbow structure (2) being connected to the discharge pipe (11), and the swing end being alternately connected to the two storage barrels (4), characterized in that: Also includes: A transition cone (5) installed between the discharge pipe (11) and the grouting hose; A feeding cylinder (7) is connected to the upper side of the transition cone tube through a feeding square tube (6), and a feeding pressure plate (71) movable up and down is provided in the inner cavity of the feeding cylinder (7), so that when the swing elbow structure (2) swings, the feeding pressure plate (71) moves downward to squeeze out the slurry in the feeding cylinder (7) and replenish it in the transition tube, thereby achieving the purpose of continuous and stable grouting; An eccentric flap (61) is hinged inside the feeding square tube (6), the hinge axis of the eccentric flap (61) deviates from the axis of the feeding square tube (6), and the eccentric flap (61) automatically adjusts its opening according to the slurry flow direction, and is used to control the slurry flow path and flow rate between the feeding cylinder (7) and the transition cone tube.

2. The shield tunnel support face grouting equipment based on underpass main canal according to claim 1 is characterized by: The hinge axis of the eccentric flap (61) is located on the axis of the feeding square tube (6) and is biased toward the feeding side of the transition cone tube (5), so that when the slurry flows in the forward direction, the eccentric flap (61) is pushed by the fluid to flip upward, allowing only the slurry to flow into the feeding tube (7) through the gap at its top; when the slurry flows in the reverse direction, the eccentric flap (61) flips downward to completely open the flow cross section of the feeding square tube (6).

3. The shield tunnel support face grouting equipment based on underpass main canal according to claim 1 is characterized by: The inner cavity of the feeding cylinder (7) is provided with a guide shaft (72) penetrating the middle of the feeding pressure plate (71); a stirring shaft (73) is provided on the lower plate surface of the feeding pressure plate (71) along its circumference; and a spiral matching structure is provided between the feeding pressure plate (71) and the guide shaft (72); the stirring shaft (73) generates a periodic stirring effect on the slurry during the upward and downward movement of the feeding pressure plate (71).

4. The shield tunnel support face grouting equipment based on underpass main canal according to claim 3 is characterized by: The stirring shaft (73) is evenly surrounded by a plurality of stirring blades (74).

5. The shield tunnel support face grouting equipment based on underpass main canal according to claim 4, characterized in that: The stirring shaft (73) comprises a plurality of shaft bodies (731) stacked in sequence, and a plurality of stirring blades (74) are evenly arranged around the bottom of the shaft body (731).

6. A shield tunnel support face grouting device based on underpass main canal according to any one of claims 3-5, characterized in that: A spring (75) is provided on the shaft of the guide shaft (72) at a position above the material feeding pressure plate (71).

7. The shield tunnel support face grouting equipment based on underpass main canal according to claim 6, characterized in that: The upper end of the guide shaft (72) extends out of the feeding cylinder (7) so that the pressure in the transition cone (5) rises suddenly, and the slurry quickly flows into the feeding cylinder (7) through the gap at the top of the eccentric flap (61), and the feeding pressure plate (71) is pushed open to release the pressure.

8. The shield tunnel support face grouting equipment based on underpass main canal according to claim 3 is characterized by: A maintenance pressing plate (76) is detachably mounted in the middle of the feeding pressing plate (71).

9. A shield tunnel support face grouting device based on underpass main canal according to any one of claims 1-6 and 8, characterized in that: The grouting method of the grouting equipment comprises the following steps: Grouting stage: the slurry in the storage tube (4) is pushed by the pushing hydraulic cylinder (3) and transported to the transition cone tube through the swing elbow and the connecting pipe, and finally injected into the shield tunnel support surface; Pressure holding stage: during the continuous output of the slurry, part of the slurry flows into the feeding cylinder (7) through the feeding square tube (6), pushing the feeding pressure plate (71) upward to store the compensation slurry; Switching feeding stage: when the material storage barrel (4) is emptied, the swing elbow structure (2) switches to another material storage barrel (4), and the material supply pressure plate (71) moves downward to press the stored slurry into the transition cone in the reverse direction to maintain a stable grouting pressure; Anti-blocking stage: If the grouting hose is blocked, the pressure in the transition cone tube rises suddenly, and the slurry flows quickly into the feeding tube (7) through the gap at the top of the eccentric flap (61) until the pressure is balanced.

10. The shield tunnel support face grouting equipment based on underpass main canal according to claim 7, characterized in that: The grouting method of the grouting equipment comprises the following steps: Grouting stage: the slurry in the storage tube (4) is pushed by the pushing hydraulic cylinder (3) and transported to the transition cone tube through the swing elbow and the connecting pipe, and finally injected into the shield tunnel support surface; Pressure holding stage: during the continuous output of the slurry, part of the slurry flows into the feeding cylinder (7) through the feeding square tube (6), pushing the feeding pressure plate (71) upward and compressing the spring (75), thereby storing pressure compensation energy; Switching feeding stage: when the material storage barrel (4) is emptied, the swing elbow structure (2) switches to another material storage barrel (4), and at the same time the spring (75) extends, driving the material feeding pressure plate (71) to move downward, and reversely presses the stored slurry into the transition cone pipe to maintain a stable grouting pressure; Anti-blocking stage: if the grouting hose is blocked, the pressure in the transition cone tube rises suddenly, and the slurry quickly flows into the feeding tube (7) through the gap at the top of the eccentric flap (61), and the feeding pressure plate (71) is pushed open to release the pressure; Stirring stage: during the upward and downward movement of the feeding pressing plate (71), the feeding pressing plate (71) drives the stirring shaft (73) to rotate under the action of the guide shaft (72) to stir the slurry, thereby preventing the slurry in the feeding cylinder (7) from settling and separation.

Images