Prefabricated pile bottom grouting device and grouting method thereof

Abstract

The present invention discloses a precast pile bottom grouting device and a grouting method thereof, belonging to the technical field of building construction. The device comprises a grouting device, a grouting pipe and a grouting pile tip, wherein the grouting device transports slurry into the grouting pile tip through the grouting pipe, and the grouting pile tip comprises an end plate, wherein the end plate is welded and fixed to one end of the precast pile located deep underground, a through hole is provided in the middle of the end plate, a protective tube is provided on the surface of one end outside the through hole, one end of the protective tube is connected to the through hole, and a closing plate is provided at the other end of the protective tube, wherein the closing plate is fixed to the protective tube, and a plurality of grouting holes are provided on the circumference of the outer surface of the protective tube, a sliding plate is provided inside the protective tube, and the edge of the sliding plate is slidably connected to the inner wall of the protective tube, and a traction rope matching the number of grouting holes is provided on the lower surface of the sliding plate, and one end of the traction rope is fixed to the sliding plate. The technical scheme is used to improve the grouting effect on the bottom of the precast pile.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and particularly relates to a prefabricated pile bottom grouting device and a grouting method thereof. Background Art

[0002] PHC piles are hollow cylindrical precast concrete piles. They are widely used in construction due to their high bearing capacity, fast construction, high quality, and low cost. However, due to limited foundation bearing capacity, the full strength of PHC piles is often not fully utilized, resulting in a waste of resources.

[0003] In order to fully utilize the strength of the PHC pipe pile, engineering technicians thought of improving the foundation bearing capacity of the PHC pipe pile by drawing on the post-grouting technology of bored cast-in-place piles in the existing technology. When grouting the bottom of the PHC pipe pile, how to prevent the soil in the pile foundation hole from clogging the grouting holes in the grouting device during pile sinking, and how to avoid the backflow of slurry after grouting are key factors to ensure the grouting effect of the PHC pipe pile. Therefore, a prefabricated pile bottom grouting device and a grouting method thereof are proposed. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a precast pile bottom grouting device and a grouting method thereof, so as to improve the grouting effect on the precast pile bottom.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a precast pile bottom grouting device for grouting the precast pile bottom, comprising a grouting device, a grouting pipe and a grouting pile tip, wherein the grouting device transports slurry into the grouting pile tip through the grouting pipe, and the grouting pile tip comprises an end plate, the end plate is welded and fixed to one end of the precast pile located deep underground, a through hole is provided in the middle of the end plate, a protective tube is provided on the surface of one end outside the through hole, one end of the protective tube is connected to the through hole, and the other end of the protective tube is provided with a closing plate, which is fixed to the protective tube, a plurality of grouting holes are provided on the circumference of the outer surface of the protective tube, a sliding plate is provided inside the protective tube, the edge of the sliding plate is slidably connected to the inner wall of the protective tube, and a sliding plate is provided on the lower surface of the sliding plate A matching number of traction ropes, one end of the traction rope is fixed to the sliding plate, the other end of the traction rope passes through the outside of the grouting hole, and a sealing ball is provided on one end of the traction rope located on the outside of the protective tube, a support spring is provided between the sliding plate and the closing plate, both ends of the support spring are fixed to the sliding plate and the closing plate, a plurality of support blocks are provided on the circumference of the upper surface of the sliding plate, and an installation spacing is provided between adjacent support blocks, when the grouting pipe is connected to the protective pipe for grouting, the end of the grouting pipe pushes the sliding plate to slide downward to the bottom of the grouting hole, when the grouting pipe is separated from the protective pipe, the support spring lifts the sliding plate to the top of the grouting hole, and the sealing ball is in close contact with the outer end surface of the grouting hole;

[0007] A mounting tube is provided in the middle of a side surface of the end plate facing the interior of the precast pile, one end of the mounting tube is fixed to the outside of the through hole, and a rubber plug is provided on the end of the grouting tube close to the mounting tube. When the grouting tube is grouting, the rubber plug is located in the mounting tube and in close contact with the inner wall of the mounting tube; a conical tip is provided on the surface of the sealing sphere outside the grouting hole, and the small diameter end of the conical tip is arranged toward the inner wall of the pile foundation hole; a pushing sphere is provided on the surface of the sealing sphere inside the grouting hole, the surface of the pushing sphere is fixed on the sealing sphere, and part of the pushing sphere protrudes to the interior of the protective tube.

[0008] Furthermore, a receiving groove is provided in the middle of the end plate, and the end of the rubber plug is tightly pressed against the receiving groove.

[0009] Furthermore, an annular sealing block is provided on the other end of the precast pile, the inner ring of the annular sealing block is located in the middle of the end plate, and the grouting pipe is slidably connected to the annular sealing block.

[0010] Furthermore, a plurality of support steel plates evenly distributed around the circumference are provided on the end plate, one end of the support steel plate is fixed to the end plate, and the grouting holes are provided between adjacent support steel plates.

[0011] Furthermore, a column is provided in the middle of the closing plate, and the middle of the sliding plate is slidably connected to the column.

[0012] Furthermore, an annular rubber block is provided on the inner side surface of one end of the protective tube connected to the closing plate, one end of the annular rubber block is fixed to the closing plate, the upper end of the annular rubber block is located below the grouting hole, and a hollow rubber column is provided on the surface of the sliding plate facing the annular rubber block, and a rectangular groove matching the position of the traction rope is provided on the surface of the hollow rubber column, and the depth of the rectangular groove is less than the thickness of the hollow rubber column.

[0013] A grouting method for a prefabricated pile bottom grouting device comprises the following construction steps:

[0014] S1, welding and fixing the end plate of the grouting pile tip to one end of the prefabricated pile installed deep underground;

[0015] S2, hoisting the prefabricated pile with the grouting pile tip to the top of the pile foundation hole on the ground, and then performing the pile sinking operation;

[0016] S3, install the annular sealing block on the other end of the precast pile, and then move the end of the grouting pipe down into the protective pipe;

[0017] S4, by applying pressure to the axial direction of the grouting pipe, the rubber plug is squeezed into the installation pipe to form a seal, and at the same time, the end of the grouting pipe presses the sliding plate downward, causing the sliding plate to slide to the bottom of the grouting hole, thereby releasing the sealing ball from the grouting hole;

[0018] S5, then grouting is carried out by injecting slurry into the grouting pipe through the grouting equipment, and the slurry seeps out from the grouting hole;

[0019] S6. After grouting is completed, the grouting pipe is lifted upwards. At this time, the support spring is reset, driving the sliding plate to move upward, and then the blocking ball is driven by the traction rope to fit tightly on the end of the grouting hole again, thereby blocking the grouting hole and preventing the slurry from flowing back.

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

[0021] The grouting device in the present technical solution can close the grouting holes during the early stage of pile sinking to prevent soil from entering the interior of the grouting pile tip and clogging the grouting holes. At the same time, during grouting, the grouting holes will automatically open to facilitate grouting operations. After the grouting is completed, the grouting holes can also be automatically closed to prevent the slurry from flowing back. Therefore, the grouting device in the present technical solution can greatly improve the grouting effect on the bottom of the prefabricated pile.

[0022] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration:

[0024] Figure 1 It is a three-dimensional schematic diagram of the pile bottom grouting device in the present invention;

[0025] Figure 2 It is a schematic cross-sectional view of the pile bottom grouting device of the present invention;

[0026] Figure 3 It is a three-dimensional schematic diagram of the grouting pile tip in the present invention;

[0027] Figure 4 It is a partial schematic diagram of the interior of the grouting pile tip protection tube in the present invention;

[0028] Figure 5 Schematic diagram of the protection tube in the present invention;

[0029] Figure 6 It is a three-dimensional schematic diagram of the internal structure of the protection tube in the present invention;

[0030] Figure 7 This is a three-dimensional schematic diagram of the installation tube provided on the end plate of the present invention;

[0031] Figure 8 A schematic diagram of the arrangement of the pushing ball in the present invention;

[0032] Figure 9 It is a three-dimensional schematic diagram of the hollow rubber column of the present invention.

[0033] The following are marked in the accompanying drawings:

[0034] 1. Precast pile; 2. Grouting pile tip; 3. End plate; 4. Protective tube; 5. Support steel plate; 6. Grouting hole; 7. Closing plate; 8. Sliding plate; 9. Support block; 10. Support spring; 11. Pull rope; 12. Sealing ball; 13. Column; 14. Annular rubber block; 15. Mounting tube; 16. Rubber plug; 17. Receiving groove; 18. Annular sealing block; 19. Grouting tube; 20 Pushing ball; 21. Hollow rubber column. DETAILED DESCRIPTION

[0035] like Figures 1 to 9The top of described supporting rib 2 is provided with the support of described outer ring 2, and the bottom of described supporting rib 2 is provided with the support of described outer ring 2. The surface is provided with a traction rope 11 matching the number of grouting holes 6. One end of the traction rope 11 is fixed to the lower surface of the sliding plate 8, and the other end of the traction rope 11 passes through the outside of the grouting holes 6 respectively, and a sealing ball 12 is provided on the end of the traction rope 11 located on the outside of the protective tube 4. The diameter of the sealing ball 12 is larger than the diameter of the grouting hole 6. A support spring 10 is provided between the sliding plate 8 and the closing plate 7. The two ends of the support spring 10 are respectively fixed on the sliding plate 8 and the closing plate 7. A plurality of support blocks 9 are provided on the circumference of the upper surface of the sliding plate 8, and an installation spacing is provided between adjacent support blocks 9. The installation spacing serves as a channel for slurry flow. When the grouting pipe 19 is connected to the protective tube 4 for grouting, the end of the grouting pipe 19 pushes the sliding plate 8 to slide downward to the bottom of the grouting hole 6. When the grouting pipe 19 is separated from the protective tube 4, the support spring 10 lifts the sliding plate 8 to the top of the grouting hole 6, and the sealing ball 12 is in close contact with the outer end surface of the grouting hole 6.

[0036] The working principle of the above technical solution is:

[0037] When the pile is being driven, the support spring 10 exerts an upward force on the sliding plate 8, so that the sliding plate 8 straightens the traction rope 11, thereby making the outer surface of the blocking ball 12 fit the grouting hole 6 and blocking the grouting hole 6. This can prevent the soil on the inner wall of the pile foundation hole from contacting the protective tube 4 during the pile driving operation, causing the soil to enter the protective tube 4 or block the grouting hole 6.

[0038] When the pile is sunk and the grouting pipe 19 is extended into the protective pipe 4, it is not difficult to understand that the diameter of the grouting pipe 19 matches the inner diameter of the protective pipe 4, that is, it can play a certain sealing role during grouting to avoid pressure relief. The end force of the grouting pipe 19 when it moves downward will overcome the damping of the support spring 10, and then squeeze the sliding plate 8 downward. The sliding plate 8 moves downward in the protective pipe 4 to the lower position of the grouting hole 6 (below the center of the grouting hole 6). At this time, the traction rope 11 is in a relaxed state, and the blocking ball 12 loses its force and will detach under gravity or grouting pressure. That is, at this time, the end of the grouting pipe 19 is connected to the grouting hole 6, and then the grouting equipment can be used to grout the pile bottom. During the grouting operation, the slurry seeps out from the grouting hole 6 into the pile foundation hole outside the protective tube 4. When the grouting is completed, the grouting tube 19 is lifted upward. At this time, the force acting on the support spring 10 disappears, and the support spring 10 will automatically reset. During the reset process, it will push the sliding plate 8 back to its initial position. That is, at this time, the sliding plate 8 will pull the traction rope 11, and then drive the blocking ball 12 to reset and block the end of the grouting hole 6 to prevent the slurry from flowing back (it should be noted that the grouting pressure is outward. Even if there is a small amount of soil at the bottom of the pile foundation hole, the pressure will push the soil outward away from the grouting hole 6, and the grouting slurry is a flowable liquid, which will not hinder the reset of the blocking ball 12).

[0039] The provision of the protection tube 4 can protect the end of the grouting tube 19, thereby avoiding the problem that the end of the grouting tube 19 is blocked and damaged by contact and collision due to direct grouting.

[0040] In one feasible manner, a mounting tube 15 is provided in the middle of a side surface of the end plate 3 facing the interior of the precast pile 1, one end of the mounting tube 15 is fixed to the outside of the through hole, and a rubber plug 16 is provided on the end of the grouting tube 19 close to the mounting tube 15. When the grouting tube 19 is grouting, the rubber plug 16 is located in the mounting tube 15 and is in close contact with the inner wall of the mounting tube 15. The rubber plug 16 is squeezed into the mounting tube 15, and the squeeze contact forms a seal, thereby avoiding pressure leakage during grouting and improving the grouting effect.

[0041] In one practicable manner, a receiving groove 17 is provided in the middle of the end plate 3, and the end of the rubber plug 16 is tightly pressed against the receiving groove 17. The end surface of the rubber plug 16 is pressurized in the receiving groove 17, which can further improve the sealing effect.

[0042] In one feasible method, an annular sealing block 18 is provided on the other end of the precast pile 1, the inner ring of the annular sealing block 18 is located in the middle of the end plate 3, and the grouting pipe 19 is slidably connected to the annular sealing block 18. The setting of the annular sealing block 18 can guide and support the installation of the grouting pipe 19, thereby improving the installation accuracy and convenience of the grouting pipe 19. Of course, the grouting pipe 19 can also be installed in advance. At this time, the annular sealing block 18 can serve as a support to avoid the grouting pipe 19 shaking during hoisting, which may cause damage.

[0043] In one feasible method, a number of circumferentially evenly distributed supporting steel plates 5 are provided on the end plate 3, one end of the supporting steel plate 5 is fixed on the end plate 3, and the grouting holes 6 are arranged between adjacent supporting steel plates 5. The arrangement of the supporting steel plates 5 can avoid the problem of the protective tube 4 being inserted into the soil due to the small contact area between the protective tube 4 and the ground of the pile foundation hole, and can also improve the bearing capacity of the bottom end of the precast pile 1.

[0044] like Figure 8 As shown, in one practicable manner, a conical tip is provided on the surface of the sealing ball 12 located outside the grouting hole 6, and the small diameter end of the conical tip is arranged toward the inner wall of the pile foundation hole. A pushing ball 20 is provided on the surface of the sealing ball 12 located inside the grouting hole 6, and the surface of the pushing ball 20 is fixed on the sealing ball 12, and part of the pushing ball 20 protrudes into the interior of the protective tube 4. When the outer side of the sealing ball 12 contacts the soil, the setting of the conical tip can reduce the contact area between the sealing ball 12 and the soil when it moves outward, thereby preventing the sealing ball 12 from contacting the soil during grouting. Under the pressure, the blocking ball 12 can be better moved into the soil by a certain distance (penetrated into the soil), thereby facilitating the formation of a gap between the blocking ball 12 and the grouting hole 6, thereby facilitating the flow of slurry for grouting. When the sliding plate 8 moves downward, it will squeeze the pushing ball 20, that is, it will push the ball 20 outward or tilt, thereby driving the blocking ball 12 to overcome the pressure of the soil and move outward or tilt, both of which can form a gap between the blocking ball 12 and the grouting hole 6, thereby further improving the effect of gap generation and improving the grouting effect.

[0045] In one practicable manner, a column 13 is provided in the middle of the closing plate 7, and the middle of the sliding plate 8 is slidably connected to the column 13. The setting of the column 13 can guide the movement of the sliding plate 8 and improve its movement effect.

[0046] like Figure 4 and Figure 9As shown, in one practicable manner, an annular rubber block 14 is provided on the inner side surface of one end of the protection tube 4 connected to the closing plate 7, one end of the annular rubber block 14 is fixed on the closing plate 7, the upper end of the annular rubber block 14 is located below the grouting hole 6, and a hollow rubber column 21 is provided on the surface of the sliding plate 8 facing the annular rubber block 14. A rectangular groove 22 matching the position of the traction rope 11 is provided on the surface of the hollow rubber column 21, and the depth of the rectangular groove 22 is less than the thickness of the hollow rubber column 21. The arrangement of the annular rubber block 14 and the hollow rubber column 21 can make the sliding plate 8 move downward. When the sliding plate 8 moves downward, the length of the traction rope 11 will only shrink, that is, the length hanging downward will be short, that is, the traction rope 11 will not accumulate, resulting in the end face of the hollow rubber column being squeezed and in contact with the end of the annular rubber block 14, thereby sealing the lower end space of the protective tube 4 to avoid the problem that the pressure and reset of the support spring 10 are affected after the slurry enters. At the same time, the setting of the rectangular groove is convenient for accommodating the traction rope 11. Preferably, the traction rope 11 is an elastic rope, that is, when the sliding plate 8 moves downward, the length of the traction rope 11 will only shrink, that is, the length hanging downward will be short, that is, the traction rope 11 will not accumulate, resulting in the end face of the hollow rubber column being squeezed, resulting in the problem that the blocking ball 12 cannot move.

[0047] A grouting method for a prefabricated pile bottom grouting device includes the following construction steps:

[0048] S1, welding and fixing the end plate 3 of the grouting pile tip 2 to one end of the precast pile 1 installed deep underground;

[0049] S2, hoisting the prefabricated pile 1 with the grouting pile tip 2 to the top of the pile foundation hole on the ground, and then performing the pile sinking operation;

[0050] S3, install the annular sealing block 18 on the other end of the precast pile 1, and then move the end of the grouting pipe 19 down into the protection pipe 4;

[0051] S4, by applying pressure to the axial direction of the grouting pipe 19, the rubber plug 16 is squeezed into the mounting pipe 15 to form a seal. At the same time, the end of the grouting pipe 19 presses the sliding plate 8 downward, causing the sliding plate 8 to slide to the bottom of the grouting hole 6, releasing the blocking ball 12 from the grouting hole 6;

[0052] S5, then the grouting equipment is used to input slurry into the grouting pipe 19, and the slurry seeps out from the grouting hole 6 to perform grouting;

[0053] S6, after grouting is completed, the grouting pipe 19 is raised upward, at which time the support spring 10 is reset, driving the sliding plate 8 to move upward, and then driving the blocking ball 12 through the traction rope 11 to fit tightly on the end of the grouting hole 6 again, thereby blocking the grouting hole 6 and preventing the slurry from flowing back.

[0054] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A precast pile bottom grouting device, used for grouting the bottom of a precast pile (1), characterized in that: The invention comprises a grouting device, a grouting pipe (19) and a grouting pile tip (2), wherein the grouting device transports slurry into the grouting pile tip (2) through the grouting pipe (19), wherein the grouting pile tip (2) comprises an end plate (3), wherein the end plate (3) is welded and fixed to one end of a prefabricated pile (1) located deep underground, wherein a through hole is provided in the middle of the end plate (3), wherein a protective pipe (4) is provided on the surface of one end outside the through hole, wherein one end of the protective pipe (4) is connected to the through hole, wherein a closing plate (7) is provided at the other end of the protective pipe (4), wherein a plurality of grouting holes (6) are provided on the circumference of the outer surface of the protective pipe (4), wherein a sliding plate (8) is provided inside the protective pipe (4), wherein the edge of the sliding plate (8) is slidably connected to the inner wall of the protective pipe (4), wherein a traction rope (11) matching the number of the grouting holes (6) is provided on the lower surface of the sliding plate (8), wherein one end of the traction rope (11) is fixed to the inner wall of the protective pipe (4), wherein ... The sliding plate (8) is provided with a plurality of support blocks (9) on the circumference of the upper surface of the sliding plate (8). The other end of the traction rope (11) passes through the outside of the grouting hole (6), and a blocking ball (12) is provided on one end of the traction rope (11) located outside the protection tube (4). A support spring (10) is provided between the sliding plate (8) and the closing plate (7). The two ends of the support spring (10) are respectively fixed to the sliding plate (8) and the closing plate (7). An installation spacing is provided between adjacent support blocks (9); when the grouting pipe (19) is connected to the protective pipe (4) for grouting, the end of the grouting pipe (19) pushes the sliding plate (8) to slide downward to below the grouting hole (6); when the grouting pipe (19) is separated from the protective pipe (4), the supporting spring (10) lifts the sliding plate (8) to above the grouting hole (6), and the blocking ball (12) is in close contact with the outer end surface of the grouting hole (6); A mounting tube (15) is provided at the middle of a side surface of the end plate (3) facing the interior of the precast pile (1), one end of the mounting tube (15) is fixed to the outside of the through hole, a rubber plug (16) is provided on the end of the grouting tube (19) close to the mounting tube (15), when the grouting tube (19) is grouting, the rubber plug (16) is located in the mounting tube (15) and is in close contact with the inner wall of the mounting tube (15); a conical tip is provided on the surface of the blocking sphere (12) located outside the grouting hole (6), the small diameter end of the conical tip is arranged toward the inner wall of the pile foundation hole, and a pushing sphere (20) is provided on the surface of the blocking sphere (12) located inside the grouting hole (6), the surface of the pushing sphere (20) is fixed to the blocking sphere (12), and a part of the pushing sphere (20) protrudes into the interior of the protective tube (4).

2. A prefabricated pile bottom grouting device according to claim 1, characterized in that: A receiving groove (17) is provided in the middle of the end plate (3), and the end of the rubber plug (16) is tightly pressed against the receiving groove (17).

3. A prefabricated pile bottom grouting device according to claim 1, characterized in that: An annular sealing block (18) is provided on the other end of the prefabricated pile (1), the inner ring of the annular sealing block (18) is located in the middle of the end plate (3), and the grouting pipe (19) is slidably connected to the annular sealing block (18).

4. A prefabricated pile bottom grouting device according to claim 1, characterized in that: A plurality of support steel plates (5) evenly distributed around the circumference are provided on the end plate (3), one end of the support steel plate (5) is fixed to the end plate (3), and the grouting holes (6) are arranged between adjacent support steel plates (5).

5. The prefabricated pile bottom grouting device according to claim 1, characterized in that: A column (13) is provided in the middle of the closing plate (7), and a middle of the sliding plate (8) is slidably connected to the column (13).

6. The prefabricated pile bottom grouting device according to claim 1, characterized in that: An annular rubber block (14) is provided on the inner side surface of one end of the protection tube (4) connected to the closing plate (7); one end of the annular rubber block (14) is fixed to the closing plate (7); the upper end of the annular rubber block (14) is located below the grouting hole (6); a hollow rubber column (21) is provided on the surface of the sliding plate (8) facing the annular rubber block (14); a rectangular groove (22) matching the position of the traction rope (11) is provided on the surface of the hollow rubber column (21); the depth of the rectangular groove (22) is less than the thickness of the hollow rubber column (21).

7. A grouting method for a precast pile bottom grouting device according to any one of claims 1 to 6, characterized in that: The construction steps include: S1, welding and fixing the end plate (3) of the grouting pile tip (2) to one end of the prefabricated pile (1) installed deep underground; S2, hoisting the prefabricated pile (1) equipped with the grouting pile tip (2) to the top of the pile foundation hole on the ground, and then performing a pile sinking operation; S3, installing the annular sealing block (18) on the other end of the prefabricated pile (1), and then moving the end of the grouting pipe (19) down into the protection pipe (4); S4, applying pressure to the grouting pipe (19) in the axial direction so that the rubber plug (16) is squeezed in the mounting pipe (15) to form a seal, and at the same time, the end of the grouting pipe (19) presses the sliding plate (8) downward so that the sliding plate (8) slides to the bottom of the grouting hole (6), thereby releasing the sealing ball (12) from sealing the grouting hole (6); S5, then injecting slurry into the grouting pipe (19) through the grouting equipment, and the slurry seeps out from the grouting hole (6) to perform grouting; S6, after grouting is completed, the grouting pipe (19) is lifted upward, at which time the support spring (10) is reset, driving the sliding plate (8) to move upward, and then driving the blocking ball (12) to fit tightly onto the end of the grouting hole (6) again through the traction rope (11), thereby blocking the grouting hole (6) and preventing the slurry from flowing back.

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