A gob filling grouting equipment

Abstract

The present invention belongs to the technical field of coal mine goaf filling equipment, and specifically relates to a goaf filling grouting equipment, which includes a grouting pump and a grouting pipe. The grouting pipe includes a pipe body and a grout stop sleeve. The pipe body is in communication with the output port of the grouting pump. A grouting head is connected to the lower end of the pipe body. The grout stop sleeve is sleeved and installed inside the pipe body. Grout stop holes are formed on the side wall of the pipe body. The grout stop sleeve protrudes outwards from the grout stop holes under the action of an external force. The structure of the present invention is simple, which can solve the problems in the prior art that the grout stopper is easily damaged during installation, cannot fully block the drill hole, affects the grouting effect, and the grout stopper cannot be conveniently recovered after the grouting is completed.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal mine goaf filling equipment, and specifically relates to a goaf filling grouting equipment. Background Art

[0002] Generally, after coal mining operations are completed, coal mine goafs will be left. If the goafs are not treated, buildings, water conservancy, transportation and other projects will be deformed or even damaged. At present, filling the goaf with cement fly ash slurry is one of the effective methods to control goaf disasters.

[0003] During the grouting process, the traditional grouting pipe structure has no plugging structure, which will cause a large amount of slurry to flow out of the drill hole, resulting in waste. When using a packer to prevent the slurry from flowing back, generally the packer is sleeved on the grouting pipe and put into the drilled hole together with the grouting pipe. However, in actual use, during the installation process, the packer body is often worn and deformed, resulting in damage. Due to the irregular inner diameter of the hole, the gap cannot be filled solidly, etc., and the slurry cannot be continuously sealed, resulting in insufficient plugging, and the slurry in the drill hole flows back, seriously affecting the plugging effect and the filling treatment effect.

[0004] At the same time, after the grouting is completed, the packer is located deep in the drill hole and is not easy to recover. In addition, after the recovery of the packer, the slurry in the drill hole is depressurized, and the slurry is likely to flow back, which will also affect the filling treatment effect. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art and solve the problems in the prior art that the packer is easily damaged during installation, cannot fully plug the drill hole, affects the grouting effect, and after the grouting is completed, the packer cannot be conveniently recovered, the present invention proposes a goaf filling grouting equipment.

[0006] The technical solution adopted by the present invention to solve its technical problems is: The present invention relates to a goaf filling grouting equipment, including a grouting pump and a grouting pipe. The grouting pipe is connected to the output port of the grouting pump. The grouting pipe includes:

[0007] A pipe body, which is interconnected with the output port of the grouting pump, and the lower end of the pipe body is threadedly connected with a grouting head;

[0008] A packer sleeve, which is sleeved and installed inside the pipe body. The packer sleeve is made of elastic rubber material. A slot is provided at the lower part inside the pipe body, and the lower end of the packer sleeve is inserted into the slot;

[0009] A grouting stop hole is provided on the side wall of the pipe body. The grouting stop holes are spirally distributed on the side wall of the pipe body, and the projection of the grouting stop holes on the horizontal plane is a complete circle; the shape of the grouting stop hole is any one of L-shaped, T-shaped, arc-shaped, and rectangular.

[0010] The plugging sleeve protrudes outward from the plugging hole under the action of an external force, and the plugging sleeves protruding in adjacent plugging holes are in contact with each other.

[0011] Preferably, a pipe head is installed at the upper end of the pipe body. The pipe head and the pipe body are connected by threads, and the pipe head is communicated with the output port of the grouting pump through a joint.

[0012] Preferably, the inner diameter of the pipe head is smaller than that of the pipe body, the inner diameter of the pipe head is equal to the inner diameter of the plugging sleeve, and the upper end of the plugging sleeve is located between the lower surface of the pipe head and the upper surface of the pipe body.

[0013] Preferably, a cavity is provided in the plugging sleeve, and the cavity is filled with a liquid, which is any one of water and hydraulic oil. The cavity is opposite to the area of the pipe body where the plugging hole is provided.

[0014] Preferably, a communication hole is provided in the plugging sleeve. The communication hole is connected to the cavity provided in the plugging sleeve, and the upper end outlet of the communication hole is located on the upper surface of the plugging sleeve;

[0015] A ring groove is provided on the lower surface of the pipe head. The ring groove is opposite to and communicated with the communication hole, and a communication pipe is installed on the pipe head. The communication pipe is communicated with the ring groove.

[0016] Preferably, a discharge hole is provided on the lower surface of the pipe body. The discharge hole communicates with the bottom of the slot, and plugging filler is filled between the bottom of the plugging sleeve and the bottom of the slot; the plugging filler is a small rubber ball wrapped with a high molecular weight water-absorbing resin and quick-setting cement, and micropores are provided on the surface of the small rubber ball;

[0017] An elastic retaining piece is installed in the discharge hole. The retaining pieces are symmetrically installed inside the discharge hole, and steel wires are embedded inside the retaining pieces. The steel wires are used to change the elasticity of the retaining pieces.

[0018] Preferably, the side wall thickness of the cavity near the grouting head end is smaller than the side wall thickness of the cavity far from the grouting head end.

[0019] Preferably, protrusions are provided on the outer wall of the plugging sleeve. The cross section of the protrusions is triangular, and the protrusions are located in the area of the plugging sleeve where the cavity is located.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. The gob filling grouting equipment described in the present invention is provided with a grout stopping hole and a grout stopping sleeve. During the grouting process, the grout stopping sleeve is extruded from the grout stopping hole by the pressure of the grout, so as to seal the drill hole, avoiding the situation that when the grouting pipe is inserted into the drill hole, the grout stopping sleeve contacts the inner wall of the drill hole, resulting in wear, deformation and damage of the grout stopping sleeve, and unable to seal the drill hole, effectively ensuring the sealing effect of the drill hole during grouting.

[0022] 2. The gob filling grouting equipment described in the present invention is provided with a discharge hole, a retaining piece, a slot and grout stopping filler. After the grouting is completed, the pressure of the pipe body is increased to the second pressure, so that the grout stopping filler is discharged into the drill hole. The grout stopping filler absorbs the moisture in the grout, expands and solidifies, and seals the part of the drill hole below the lower end of the grouting pipe. Thus, after the grouting pipe is removed from the drill hole, the drill hole is continuously sealed, avoiding the pressure relief of the grout in the drill hole and causing the grout to flow back, which affects the grouting effect and filling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 is the front view of the grouting equipment of the present invention;

[0025] Figure 2 is the partial sectional view of the grouting equipment of the present invention;

[0026] Figure 3 Figure 2 The partial enlarged view at A in;

[0027] Figure 4 is Figure 2 The partial enlarged view at B in;

[0028] Figure 5 is Figure 2 The partial enlarged view at C in;

[0029] In the figure: 1, pipe body; 11, grout stopping hole; 12, discharge hole; 121, retaining piece; 13, slot; 2, pipe head; 21, connecting pipe; 211, annular groove; 3, joint; 4, grouting head; 5, grout stopping sleeve; 51, cavity; 52, communication hole; 53, protrusion; 6, grout stopping filler. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0031] Such as Figures 1 to 5As shown, a gob filling grouting device according to the present invention includes a grouting pump and a grouting pipe, and the grouting pipe is connected to the output port of the grouting pump. The grouting pipe includes:

[0032] A pipe body 1, the pipe body 1 is interconnected with the output port of the grouting pump, and the lower end of the pipe body 1 is threadedly connected with a grouting head 4;

[0033] A grout stop sleeve 5, the grout stop sleeve 5 is sleeved and installed inside the pipe body 1, the grout stop sleeve 5 is made of elastic rubber material, a slot 13 is provided at the lower part inside the pipe body 1, and the lower end of the grout stop sleeve 5 is inserted into the slot 13;

[0034] A grout stop hole 11 is formed on the side wall of the pipe body 1, the grout stop holes 11 are spirally distributed on the side wall of the pipe body 1, and the projection of the grout stop holes 11 on the horizontal plane is a complete circle; the shape of the grout stop hole 11 is any one of L-shaped, T-shaped, arc-shaped, and rectangular;

[0035] The grout stop sleeve 5 protrudes outwards from the grout stop hole 11 under the action of an external force, and the grout stop sleeves 5 protruding in adjacent grout stop holes 11 are in contact with each other;

[0036] When filling the goaf by grouting, the grouting pipe is inserted into the drilled hole that has been opened. Then, the prepared slurry is transported into the grouting pipe through a grouting pump and then fed into the area to be grouted in the drilled hole from the grouting head 4 of the grouting pipe. At the same time, during the grouting process, when the slurry is transported into the grouting pipe, the pressure of the slurry on the grout stopper 5 inside the pipe body 1 of the grouting pipe causes the grout stopper 5 made of elastic rubber material to deform, and then protrudes from the grout holes 11 opened on the pipe body 1 to the outside of the pipe body 1 and contacts the inner wall of the drilled hole. At the same time, since the projection of the grout holes 11 on the horizontal plane is a complete circle and the grout stoppers 5 protruding from adjacent grout holes 11 are in contact with each other, the grout stopper 5 protruding to the outside of the pipe body 1 under the pressure of the slurry produces the effect of a grout plug, sealing the gap between the drilled hole and the grouting pipe, preventing the drilled hole from being poorly sealed and the slurry in the drilled hole from flowing back, which affects the grouting effect and the filling treatment effect. At the same time, by setting multiple regions with grout holes 11 opened in the length direction of the pipe body 1, the sealing effect of the grouting hole during grouting is further improved. Moreover, the multiple regions with grout holes 11 opened produce the effects of multi-stage sealing and step-down pressure, further achieving the effect of preventing grout from flowing back. And in the actual use process, there is no need to separately set up a pipeline for pressing the grout stopper 5 to protrude, which is convenient to use. At the same time, after the grouting is completed, the operation of the grouting pump is stopped, so that the pressure of the slurry in the pipe body 1 on the grout stopper 5 is reduced. The grout stopper 5 retracts from the grout holes 11 under the action of its own elastic force and re-enters the inside of the pipe body 1. Then, a special device is used to extract the pipe body 1 from the drilled hole for subsequent use. And during the process of removing the grouting pipe from the drilled hole, since the grout stopper 5 retracts into the inside of the pipe body 1, the pipe body 1 of the grout pipe is not easily in contact with the inner wall of the drilled hole, reducing the friction between the pipe body 1 and the inner wall of the drilled hole and avoiding the possibility that the pipe body 1 is stuck in the drilled hole during the process of removing the grout pipe, which is convenient for the disassembly of the grouting pipe after the grouting is completed;

[0037] At the same time, since the grout stopper 5 is located inside the pipe body 1 in the initial state, during the process of inserting the grouting pipe into the drilled hole, the grout stopper 5 will not contact the inside of the drilled hole, that is, the grout stopper 5 will not be worn, deformed and damaged during the installation process of the grout pipe, resulting in the situation where the drilled hole cannot be sealed, effectively ensuring the sealing effect of the drilled hole during grouting.

[0038] As an implementation manner of the present invention, a pipe head 2 is installed at the upper end of the pipe body 1. The pipe head 2 and the pipe body 1 are connected by threads, and the pipe head 2 is communicated with the output port of the grouting pump through a joint 3;

[0039] During use, first insert the pipe body 1 into the drilled hole that has been made. After that, install the pipe head 2, which is connected to the output port of the grouting pump through the joint 3, onto the pipe body 1, thus facilitating the installation of the grouting pipe and avoiding being affected by the pipeline for transporting the slurry during the installation of the grouting pipe. At the same time, after the grouting is completed, if the grout stop sleeve 5 protruding outside the pipe body 1 is affected by the slurry in the drilled hole or the protruding grout stop sleeve 5 gets stuck in the grooves or gaps on the inner wall of the drilled hole, resulting in the grout stop sleeve 5 not being able to easily retract into the pipe body 1 by itself, the staff will remove the pipe head 2 from the pipe body 1. Then, use a special device / clamp to pull the grout stop sleeve 5 from the inside of the pipe body 1, promoting the part of the grout stop sleeve 5 protruding outside the pipe body 1 to retract into the pipe body 1. After all or most of the part of the grout stop sleeve 5 protruding outside the pipe body 1 has retracted into the pipe body 1, then remove the pipe body 1 from the drilled hole to reduce the difficulty of removing the pipe body 1 from the drilled hole and avoid damaging the grout stop sleeve 5, which may affect subsequent use.

[0040] As an embodiment of the present invention, the inner diameter of the pipe head 2 is smaller than the inner diameter of the pipe body 1, the inner diameter of the pipe head 2 is equal to the inner diameter of the grout stop sleeve 5, and the upper end of the grout stop sleeve 5 is located between the lower surface of the pipe head 2 and the upper surface of the pipe body 1;

[0041] During use, after the pipe head 2 is installed on the upper end of the pipe body 1 by means of threads, the upper end of the grout stop sleeve 5 located inside the pipe body 1 is pressed by the lower surface of the pipe head 2 against the upper surface of the pipe body 1, thereby fixing the relative position of the grout stop sleeve 5 inside the pipe body 1 and preventing the grout stop sleeve 5 from moving inside the pipe body 1 during grouting, which may affect the normal progress of grouting. At the same time, by pressing the upper end of the grout stop sleeve 5 against the upper surface of the pipe body 1 through the pipe head 2, the gap between the upper end of the grout stop sleeve 5 and the pipe body 1 can be closed, preventing the slurry from seeping into the gap between the upper end of the grout stop sleeve 5 and the pipe body 1 during grouting, which may affect the protrusion of the grout stop sleeve 5 under the pressure of the slurry and result in poor grouting effect and filling treatment effect.

[0042] As an embodiment of the present invention, a cavity 51 is formed inside the grout stop sleeve 5, and the cavity 51 is filled with a liquid, which can be any one of water and hydraulic oil. The cavity 51 is aligned with the area on the pipe body 1 where the grout stop holes 11 are provided;

[0043] By injecting liquid into the cavity 51 within the grout stop sleeve 5, when the grout stop sleeve 5 is squeezed by the grout within the pipe body 1, it is more likely to deform, causing the grout stop sleeve 5 to protrude from the grout stop holes 11 opened on the pipe body 1 to the outside, sealing the borehole and preventing grout backflow. At the same time, by setting the cavity 51 and filling it with liquid, when the grout pump stops working after grouting is completed and the grout pressure within the pipe body 1 decreases, through the action of the liquid as a force transmission medium, it promotes the protruding grout stop sleeve 5 to retract into the pipe body 1. Moreover, by using the filled liquid as a force transmission medium, it can also effectively transmit the force of the grout on the grout stop sleeve 5 and act on the inner wall of the borehole, avoiding the grout stop sleeve 5 being subjected to excessive pressure, resulting in damage to the grout stop sleeve 5 and affecting subsequent use.

[0044] As an embodiment of the present invention, a communication hole 52 is opened within the grout stop sleeve 5. The communication hole 52 connects to the cavity 51 opened within the grout stop sleeve 5, and the upper end outlet of the communication hole 52 is located on the upper surface of the grout stop sleeve 5;

[0045] A ring groove 211 is opened on the lower surface of the pipe head 2. The ring groove 211 is opposite to and communicates with the communication hole 52. A connecting pipe 21 is installed on the pipe head 2, and the connecting pipe 21 communicates with the ring groove 211;

[0046] When storing the grouting pipe, the grout stop sleeve 5 within the pipe body 1 is taken out and stored separately to avoid the grout stop sleeve 5 within the pipe body 1 aging during long-term storage, affecting the use of the grouting pipe. At the same time, when the grout stop sleeve 5 is stored separately, the liquid within the cavity 51 is released or pumped out through the communication hole 52 to avoid the liquid within the cavity 51 damaging the grout stop sleeve 5 during long-term storage;

[0047] When the pipe body 1 is first inserted into the borehole and then the grout stop sleeve 5 is placed into the pipe body 1, the cavity 51 within the grout stop sleeve 5 is not pre-filled with liquid to avoid the grout stop sleeve 5 becoming hard and straight after the cavity 51 is filled with liquid, which is not conducive to the movement and installation of the grout stop sleeve 5. At the same time, after the grout stop sleeve 5 and the pipe head 2 are both installed on the pipe body 1, the ring groove 211 on the pipe head 2 communicates with the communication hole 52. The staff fills the cavity 51 with liquid through the connecting pipe 21, the ring groove 211, and the communication hole 52. An external electric pump or manual pump can be used during the liquid filling process. After the liquid filling is completed, the connecting pipe 21 is sealed;

[0048] After grouting is completed, the liquid within the cavity 51 is pumped out through the connecting pipe 21, making the cavity 51 in a negative pressure state, further promoting the part of the grout stop sleeve 5 protruding outside the pipe body 1 to retract into the pipe body 1, facilitating the removal of the grouting pipe.

[0049] As an embodiment of the present invention, a discharge hole 12 is formed in the lower surface of the pipe body 1, and the discharge hole 12 communicates with the bottom of the slot 13. A grout stop filler 6 is filled between the bottom of the grout stop sleeve 5 and the bottom of the slot 13; the grout stop filler 6 is a small rubber ball wrapped with a superabsorbent resin and quick-setting cement, and micropores are formed on the surface of the small rubber ball;

[0050] An elastic retaining piece 121 is installed in the discharge hole 12. The retaining piece 121 is symmetrically installed inside the discharge hole 12, and steel wires are embedded inside the retaining piece 121. The steel wires are used to change the elasticity of the retaining piece 121;

[0051] During normal grouting, the pressure of the grout in the pipe body 1 on the grout stop sleeve 5 is the first pressure. Under the first pressure, the grout stop sleeve 5 protrudes from the grout stop hole 11 to the outside of the pipe body 1. However, the pressure of the grout stop sleeve 5 on the grout stop filler 6 at the bottom of the slot 13 is less than the force required for the retaining edge to undergo elastic deformation. Therefore, the retaining piece 121 will not be pushed open, and the grout stop filler 6 at the bottom of the slot 13 is discharged from the discharge hole 12 into the grouting area in the borehole;

[0052] After the grouting is completed, the grouting pump increases the grouting pressure. The pressure of the grout in the pipe body 1 on the grout stop sleeve 5 is the second pressure. At this time, the second pressure is significantly greater than the first pressure. Under the second pressure, the pressure of the grout stop sleeve 5 on the grout stop filler 6 at the bottom of the slot 13 is greater than the force required for the retaining edge to undergo elastic deformation, and the retaining piece 121 is pushed open, so that the grout stop filler 6 at the bottom of the slot 13 is discharged from the discharge hole 12 into the grouting area in the borehole. After the grout stop filler 6 is discharged, the grout stop filler 6 absorbs the moisture in the grout and rapidly expands and solidifies, thereby sealing the part of the borehole at the lower end of the grouting pipe. Therefore, after the grouting pipe is removed from the borehole, the borehole is no longer blocked, resulting in the pressure relief of the grout injected into the borehole and causing the grout to flow back, affecting the grouting effect and filling effect;

[0053] At the same time, another embodiment is that during actual use, when conditions permit, after the grouting is completed, an external electric pump or manual pump can also be reconnected to the connecting pipe 21, and by continuously injecting liquid into the cavity 51, the pressure of the grout in the pipe body 1 on the grout stop sleeve 5 is changed to the second pressure, rather than achieving the second pressure by increasing the grouting pressure of the grouting pump.

[0054] As an embodiment of the present invention, the wall thickness of the side wall of the cavity 51 near one end of the grouting head 4 is less than the wall thickness of the side wall of the cavity 51 far from one end of the grouting head 4;

[0055] During grouting, the grout stop sleeve 5 near the grouting head 4 in the cavity 51 expands first, and the grout stop sleeve 5 far from the grouting head 4 expands later. At the same time, by using the fact that the grout stop sleeve 5 at the thinner side wall of the cavity 51 expands and deforms more easily and to a greater extent, the borehole can be fully filled to improve the plugging effect on the borehole.

[0056] In addition, during grouting, the grout exerts a reaction force on the grouting pipe, causing the grouting pipe to tend to retreat out of the borehole. By using the fact that the side wall at the part of the cavity 51 far from the grouting head 4 is thicker, after the grout stop sleeve 5 at this part protrudes outside the pipe body 1, the acting force between the grout stop sleeve 5 and the inner wall of the borehole can be increased, the fixing effect of the grouting pipe can be improved, and the possibility of the grouting pipe retreating can be reduced. At the same time, the side wall at the part of the cavity 51 with a thicker side wall is close to the outlet direction of the borehole. When the grouting pipe is subjected to a reaction force and has a tendency to retreat, the side wall of the grout stop sleeve 5 at this part can also bear a greater frictional force. Thus, while ensuring full contact with the grouting hole and preventing leakage, damage to the grout stop sleeve 5 can be avoided, and the service life of the grout stop sleeve 5 can be extended.

[0057] As an implementation mode of the present invention, a protrusion 53 is provided on the outer wall of the grout stop sleeve 5. The cross-section of the protrusion 53 is triangular, and the protrusion 53 is located in the area of the cavity 51 above the grout stop sleeve 5.

[0058] During use, when the grout stop sleeve 5 protrudes outside the pipe body 1 and contacts the inner wall of the borehole, the protrusion 53 on the outer wall of the grout stop sleeve 5 can increase the contact area between the grout stop sleeve 5 protruding outside the pipe body 1 and the inner wall of the borehole, and increase the frictional force between the two. Thus, when the grout for grouting exerts a reaction force on the grouting pipe, the grouting pipe can be prevented from retreating under the reaction force, so that the grouting pipe moves in the borehole, affecting the grouting effect and the filling effect.

[0059] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A goaf filling grouting device, comprising a grouting pump and a grouting pipe, the grouting pipe being connected to the output port of the grouting pump, characterized in that: The grouting pipe includes: A pipe body (1), the pipe body (1) is in communication with the output port of the grouting pump, and the lower end of the pipe body (1) is connected with a grouting head (4) by a thread; A grout stop sleeve (5), the grout stop sleeve (5) is sleeved and installed inside the pipe body (1), the grout stop sleeve (5) is made of elastic rubber material, a slot (13) is arranged at the lower part inside the pipe body (1), and the lower end of the grout stop sleeve (5) is inserted into the slot (13); A grout stop hole (11) is formed in the side wall of the pipe body (1), the grout stop holes (11) are spirally distributed on the side wall of the pipe body (1), and the projection of the grout stop holes (11) on the horizontal plane is a complete circle; The grout stop sleeve (5) protrudes outwards from the grout stop hole (11) under the action of an external force, and the grout stop sleeves (5) protruding in adjacent grout stop holes (11) are in contact with each other; A pipe head (2) is installed at the upper end of the pipe body (1), and the pipe head (2) is communicated with the output port of the grouting pump through a joint (3); The inner diameter of the pipe head (2) is smaller than the inner diameter of the pipe body (1), the inner diameter of the pipe head (2) is equal to the inner diameter of the grout stop sleeve (5), and the upper end of the grout stop sleeve (5) is located between the lower surface of the pipe head (2) and the upper surface of the pipe body (1); A cavity (51) is formed in the grout stop sleeve (5), a liquid is filled in the cavity (51), and the cavity (51) is opposite to the area where the grout stop holes (11) are formed on the pipe body (1); A communication hole (52) is formed in the grout stop sleeve (5), the communication hole (52) connects the cavity (51) formed in the grout stop sleeve (5), and the upper end outlet of the communication hole (52) is located on the upper surface of the grout stop sleeve (5); A ring groove (211) is formed on the lower surface of the pipe head (2), the ring groove (211) is opposite to and communicated with the communication hole (52), and a communication pipe (21) is installed on the pipe head (2), and the communication pipe (21) is communicated with the ring groove (211); A discharge hole (12) is formed in the lower surface of the pipe body (1), the discharge hole (12) is communicated to the bottom of the slot (13), and a grout stop filler (6) is filled between the bottom of the grout stop sleeve (5) and the bottom of the slot (13); An elastic retaining piece (121) is installed in the discharge hole (12), and the retaining piece (121) is symmetrically installed inside the discharge hole (12).

2. The gob filling grouting equipment according to claim 1, characterized in that: The side wall thickness of the cavity (51) at one end close to the grouting head (4) is smaller than the side wall thickness of the cavity (51) at one end far from the grouting head (4).

3. The gob filling grouting equipment according to claim 2, characterized in that: A protrusion (53) is arranged on the outer wall of the grout stop sleeve (5), and the cross section of the protrusion (53) is in an inverted triangle shape.

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