A stable post-grouting device suitable for a vibratory cast-in-place pile

Abstract

The application belongs to the field of civil construction equipment, and particularly relates to a stable post-grouting device suitable for a vibrated cast-in-place pile, which comprises a pile body and a pile tip, the pile tip is provided with a grouting cavity, the lateral wall of the pile tip is provided with a grouting hole connected to the grouting cavity, the upper side of the grouting hole of the pile tip is provided with a ring capsule, and the ring capsule is connected with a grouting pipeline; wherein the ring capsule can be extended and retracted on the surface side of the pile tip, and the ring capsule can be expanded out of the surface side of the pile tip after grouting, the ring capsule can form a grouting stopping structure before one-time grouting, the closure of the grouting hole is reduced, and the problems in the prior art are effectively solved.

Description

Technical fields:

[0002] This invention relates to the field of civil engineering construction equipment, and in particular to a grouting device for stabilizing vibratory driven cast-in-place piles. Background technology:

[0004] The vibratory or vibratory impact driven pipe method uses a vibratory pile hammer or vibratory impact pile hammer to drive the pile pipe into the soil, then pours concrete into the pipe, and pulls the pipe out to form a pile. It is suitable for construction on slightly dense and medium-dense gravelly soil foundations.

[0005] In applications involving high groundwater levels, loose geology, and soft, saturated soil, where ground compaction is required and significant compensation for the foundation's bearing capacity is ultimately necessary, a common practice is to drill holes on both sides of the piles and inject grout to reinforce the foundation after pile installation to meet design requirements.

[0006] After the piles are formed, holes are drilled on both sides of the piles to lay pipes for grouting to reinforce the foundation. However, this grouting method cannot achieve targeted area reinforcement grouting. Furthermore, the drilling time for grouting is long and the operation process is cumbersome. The grout cannot achieve uniform reinforcement of the strata at the pile tip, resulting in grouting waste and poor grouting effect.

[0007] The applicant attempted to perform secondary grouting by reserving grouting holes at the pile tip. During the secondary grouting, it was found that during the first grouting, the grout diffused to the reserved grouting hole. When the grouting pressure in the pile body was high, the grout at the pile tip formed a thick solidified layer that diffused into the soil layer, which easily sealed the grouting hole at the pile tip. Summary of the Invention:

[0009] This invention provides a grouting device for stabilized cast-in-place piles suitable for vibratory driven pipe piles. By setting a ring bladder, a grout-stopping structure can be formed through the ring bladder before the first grouting, reducing the closure of the grouting hole and effectively solving the problems existing in the prior art.

[0010] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a grouting device suitable for stabilization of vibratory driven cast-in-place piles, comprising a pile body and a pile tip, wherein the pile tip is provided with a grouting cavity, and the side wall of the pile tip is provided with a grouting hole communicating with the grouting cavity. The pile tip is provided with an annular bladder on the upper side of the grouting hole, and the annular bladder is connected to a grouting pipe; wherein the annular bladder can expand and contract on the surface of the pile tip, and the annular bladder can expand out of the surface of the pile tip after grouting.

[0011] Furthermore, the pile tip is provided with an annular groove for installing the annular bladder, and the post-grouting device also includes a protective plate covering the annular groove. The protective plate includes a plurality of protective plate portions spaced apart along the circumference of the pile tip, and the protective plate portions are configured to be separable from the annular groove.

[0012] Furthermore, the protective plate portion is engaged with the annular groove.

[0013] Furthermore, the protective plate includes: an arc-shaped cover that fits against the annular bladder, with both ends of the arc-shaped cover abutting against the pile tip radially to prevent the arc-shaped cover from moving inward; and two outer plates spaced apart along the length of the pile body, with the outer ends of the outer plates engaging the edge of the annular groove and the inner ends connected to the arc-shaped cover; wherein the connection between the outer plates and the arc-shaped cover is configured such that when the arc-shaped cover is pushed outward by the annular bladder with a set force, the outer plates separate from the arc-shaped cover.

[0014] Furthermore, the outer plate is welded to the arc-shaped cover.

[0015] Furthermore, the pile tip includes a pointed cone portion and a cylindrical portion disposed on the upper side of the pointed cone portion, and the annular bladder is installed on the cylindrical portion.

[0016] Furthermore, the post-grouting device also includes a slidably disposed guide rod in the grouting hole. One end of the guide rod is provided with an outer cover covering the grouting hole, and the other end is provided with a limiting block. The limiting block is slidably engaged with the grouting hole so that when the pressure on the side of the limiting block away from the guide rod is greater than a set value, the limiting block pushes the guide rod to move outward from the pile tip.

[0017] Furthermore, the grout guide rod is hollow and has a grout outlet hole. The grout guide rod is open to the side facing the limiting block. When the grout guide rod moves outward from the pile tip, at least part of the grout outlet hole is located outside the pile tip. The limiting block can switch between a first state of closing the grout guide rod and a second state of opening the grout guide rod.

[0018] Furthermore, the limiting block includes: an outer block body, installed on the grout guide rod, having a through hole communicating with the grout guide rod, the outer block body being able to slide with the grouting hole; a valve plate, installed on the outer block body and covering the through hole; and a traction rope, connected to the valve plate and extending to the upper side of the pile tip.

[0019] Furthermore, the valve plate is magnetically connected to the outer block.

[0020] The beneficial effect of this invention is that by setting the ring bladder, a grout-stopping structure can be formed through the ring bladder before grouting, reducing the sealing of the grouting hole and effectively solving the problems existing in the prior art. Attached image description:

[0022] Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 Enlarged schematic diagram of the local structure at point A;

[0024] Figure 3 for Figure 1 Enlarged schematic diagram of the local structure at point B;

[0025] Figure 4 for Figure 1 Enlarged schematic diagram of the local structure at point C;

[0026] Figure 5 for Figure 1 The diagram shows the structure after the guide rod is pushed out in the embodiment shown.

[0027] In the diagram, 1. Pile body; 2. Pile tip; 3. Grouting cavity; 4. Grouting hole; 5. Guide rod; 6. Outer cover; 7. Limiting block; 701. Outer block; 702. Valve plate; 8. Grout outlet hole; 9. Traction rope; 10. Through hole; 11. Supporting step; 12. Connecting rope; 13. Soil layer; 14. Ring; 1501. Protective plate; 15011. Arc-shaped cover; 15012. Outer plate; 16. Conical part; 17. Cylindrical part. Detailed implementation method:

[0029] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0030] The embodiments of the present invention are as follows Figure 1-5 As shown, a grouting device suitable for stabilization of vibratory driven cast-in-place piles includes a pile body 1 and a pile tip 2. The pile tip 2 is provided with a grouting cavity 3, and the side wall of the pile tip 2 is provided with a grouting hole 4 communicating with the grouting cavity 3. The pile tip 2 is provided with an annular bladder 14 on the upper side of the grouting hole 4, and the annular bladder 14 is connected to a grouting pipe. The annular bladder 14 can extend and retract on the surface of the pile tip 2, and the annular bladder 14 can expand out of the surface of the pile tip 2 after grouting.

[0031] In use, the post-grouting device of the present invention sinks the pile body 1 and pile tip 2 into the soil layer 13, and grout is injected into the annular bladder 14, causing the annular bladder 14 to expand outward and bulge, and to be squeezed into the soil layer 13, so that the pile tip 2 forms an annular grout-stopping structure at the position of the annular bladder 14. After the grouting in the annular bladder is formed, steel bars are inserted into the pile body 1 and the pile is cast. During the casting process, the pile body 1 is moved upward until the pile body 1 is cast. During this process, due to the restriction of the grout-stopping structure, the grouting pressure transmitted to the pile tip 2 can be reduced, thereby reducing the thickness of the grouting formed after the grout is diffused at the pile tip 2. In some working conditions, the pile tip 2 may not even be sealed by grouting at the grouting hole 4. When secondary grouting is required after the pile body 1 has been grouted, grout is injected into the grouting cavity 3 so that the grout can spread at the pile tip 2 to reinforce the pile foundation. During this process, since the pile body 1 is limited by the primary grouting process, the grouting pressure at the pile tip 2 can be appropriately increased to increase the range of grout diffusion and further stabilize the pile foundation.

[0032] Regarding the installation of the annular bladder 14 at the pile tip 2, in the illustrated embodiment, more specifically, the pile tip 2 is provided with an annular groove for installing the annular bladder 14, and the post-grouting device further includes a protective plate covering the annular groove. The protective plate includes a plurality of protective plate portions 1501 spaced apart along the circumference of the pile tip 2, and the protective plate portions 1501 are configured to be separable from the annular groove.

[0033] In the illustrated embodiment, a preferred method for grouting the annular bladder is as shown in the figure. A grouting channel, pre-set within the pile tip and communicating with the annular groove, is used. During annular bladder installation, a grouting pipeline is pre-set within the annular bladder. This pipeline extends from the grouting channel to the upper side of the pile tip and then extends to the top of the pile body via an external pipe for grouting. Alternatively, in an alternative embodiment, a vertical through-groove extending from the top of the annular groove to the top of the pile tip can be created, with the grouting pipeline connected to the annular bladder extending directly there.

[0034] As shown in the figure, by setting the annular groove, the annular bladder 14 can be contracted inside the pile tip 2 to prevent damage to the annular bladder 14 when the pile tip 2 is driven down. By setting the protective plate, the annular bladder 14 can be further protected when the pile tip 2 is driven down. During the secondary grouting, the grouting pressure drops and pushes the annular bladder 14 outward, causing the protective plate to separate from the annular groove and releasing the annular bladder 14.

[0035] Regarding the connection between the protective plate and the pile tip 2, in the illustrated embodiment, more specifically, the protective plate portion 1501 is engaged in the annular groove. As shown in the figure, the protective plate portion 1501 is engaged in the annular groove. During the lowering of the pile tip 2, when the protective plate portion 1501 is subjected to an impact force towards the inside of the pile tip 2, it can protect the annular bladder 14. Furthermore, the engagement structure between the pile tip 2 and the protective plate portion 1501 can support the protective plate portion 1501 and prevent the protective plate portion 1501 from collapsing.

[0036] In the illustrated embodiment, the protective plate 1501 further comprises: an arc-shaped cover 15011, which fits against the annular bladder 14, and both ends of the arc-shaped cover 15011 abut against the pile tip 2 radially to prevent the arc-shaped cover 15011 from moving inward; two outer plates 15012, which are spaced apart along the length of the pile body 1, with the outer ends of the outer plates 15012 engaged with the edge of the annular groove and the inner ends connected to the arc-shaped cover 15011; wherein the connection between the outer plates 15012 and the arc-shaped cover 15011 is configured such that when the arc-shaped cover 15011 is pushed outward by the annular bladder 14 with a set force, the outer plates 15012 separate from the arc-shaped cover 15011.

[0037] As shown in the figure, during assembly, the annular bladder is installed in the annular groove, and then the arc-shaped cover 15011 is fastened to the outside of the annular bladder 14. After the outer end of the outer plate 15012 is snapped onto the edge of the annular groove, the inner edge of the outer plate 15012 is connected to the arc-shaped cover 15011 to complete the assembly. When the pile tip 2 sinks into the soil layer 13, the outer plate 15012 is impacted, and the snapping position between the annular groove and the outer plate 15012 is supported and limited. At the same time, the arc-shaped cover 15011 can form an arch-like support to improve the deformation resistance of the protective plate 1501.

[0038] In addition, by using the combination of outer plate 15012 and arc-shaped cover 15011, the outer plate 15012 can be connected later during assembly, which makes it easier to assemble the outer plate 15012 into a conical shape.

[0039] During use, the ring bladder 14 expands outward, pushing the arc-shaped cover 15011 outward and breaking the connection structure between the arc-shaped cover 15011 and the outer plate 15012. The two outer plates 15012 open upward and downward respectively, and the ring bladder 14 pushes the arc-shaped cover 15011 outward. After the arc-shaped cover 15011 comes into contact with the soil layer 13, the arc-shaped cover 15011 can also form a medium for transmitting force between the ring bladder 14 and the soil layer 13 to a certain extent, so that the ring bladder 14 can relatively evenly squeeze the soil layer 13 outward at the position of the arc-shaped cover 15011. This reduces the problem of uneven expansion and bulging of the ring bladder 14 caused by the different integrity and strength of the soil layer 13 around the pile tip 2 in some working conditions, and further improves the fixing and grouting effect of the ring bladder 14 on the pile tip 2.

[0040] Preferably, the outer plate 15012 and the arc-shaped cover 15011 are welded together. By connecting the outer plate 15012 and the arc-shaped cover 15011 through post-welding, the connection between them can be easily achieved. The connection strength between the outer plate 15012 and the arc-shaped cover 15011 can be controlled by adjusting the weld length and the number of weld points, making it easy to separate the outer plate 15012 from the arc-shaped cover 15011.

[0041] In the illustrated embodiment, more specifically, the pile tip 2 includes a conical portion 16 and a cylindrical portion 17 disposed on the upper side of the conical portion 16, with the annular bladder 14 installed on the cylindrical portion 17. As shown, by installing the annular bladder 14 on the cylindrical portion 17, the stress on the annular bladder 14 in the soil layer 13 can be reduced when the pile tip 2 sinks into the soil layer 13, making the annular bladder 14 less prone to damage during the sinking process.

[0042] Preferably, the post-grouting device further includes a grouting guide rod 5 slidably disposed in the grouting hole 4. One end of the grouting guide rod 5 is provided with an outer cover 6 covering the grouting hole 4, and the other end is provided with a limiting block 7. The limiting block 7 is slidably engaged with the grouting hole 4 so that when the pressure on the side of the limiting block 7 away from the grouting guide rod 5 is greater than a set value, the limiting block 7 pushes the grouting guide rod 5 to move outward from the pile tip 2.

[0043] Before the grouting of the pile body 1 has completely solidified, a pressurized medium is introduced into the grouting cavity 3 and the grouting hole 4, causing the guide rod 5 to extend from the grouting hole 4 and pass through the casting area between the pile tip 2 and the soil layer 13 into the surrounding soil layer 13. After the pile is cast and shaped, grout is injected into the grouting cavity 3, allowing the grout to be guided by the guide pipe to diffuse into the surrounding soil layer 13, thereby increasing the stability of the bond between the pile tip 2 and the soil layer 13. By setting the guide rod 5, the guide rod 5 can extend to the side of the pile tip 2 before the pile body 1 is formed, so that the grout outlet of the guide rod 5 can be far away from the pile tip 2, preventing the sealing of the grouting hole 4 after the grouting is formed in one go.

[0044] It should be noted that the improvement of this application lies in the setting of the secondary grouting structure at the pile tip 2. There are no restrictions on the connection and fit between the pile body 1 and the pile tip 2. Those skilled in the art can flexibly choose known connection and fit methods when implementing it.

[0045] In a preferred embodiment, specifically, the grout guide rod 5 is hollow and has a grout outlet hole 8. The grout guide rod 5 is open on one side facing the limiting block 7, and when the grout guide rod 5 moves outward from the pile tip 2, at least a portion of the grout outlet hole 8 is located outside the pile tip 2. The limiting block 7 can switch between a first state of closing the grout guide rod 5 and a second state of opening the grout guide rod 5. As shown in the figure, this allows grout to be injected into the soil layer 13 through the inside of the grout guide rod 5 during secondary grouting, facilitating grout diffusion. Furthermore, by setting two states for the limiting block 7, the state of the limiting block 7 can be switched during pushing the grout guide rod 5 and during secondary grouting. This allows for the extension and movement of the grout guide rod 5 while reducing the impact of the limiting block 7 on the flowability of the grout during secondary grouting.

[0046] In the illustrated embodiment, the limiting block 7 specifically includes: an outer block 701, installed on the grout guide rod 5, having a through hole 10 communicating with the grout guide rod 5, and the outer block 701 being able to slide with the grouting hole 4; a valve plate 702, installed on the outer block 701 and covering the through hole 10; and a traction rope 9, connected to the valve plate 702 and extending to the upper side of the pile tip 2.

[0047] As shown in the figure, a secondary grouting pipe is installed inside the pile. The traction rope 9 extends from the secondary grouting pipe to the upper side. During use, pressurized water can be injected to push the block inside the pile, causing the guide rod 5 to extend. After the guide rod 5 extends, the water can be pumped out. When secondary grouting is required, the valve plate 702 can be pulled upward by the traction rope 9 to form a... Figure 3 As shown in the diagram, the guide rod 5 can be opened to connect the guide rod 5 with the grouting hole 4 and the grouting cavity 3. At this time, grout can be supplied to the grouting cavity 3 through the secondary grouting pipe.

[0048] A further optimization in the illustrated embodiment is that, as shown, the valve plate 702 is magnetically connected to the outer block 701. By magnetically connecting the valve plate 702 to the outer block 701, the condition where the valve plate 702 cannot seal the through hole 10 during the injection of pressurized medium, which would result in the valve plate 702 falling off, can be prevented. Specifically, the magnetic connection between the valve plate 702 and the outer block 701 can be achieved by providing a magnet on the outer block 701 and an iron component on the valve plate 702.

[0049] In the illustrated embodiment, more specifically, as shown in the figure, the guide rod 5 and the outer cover 6 are separate structures, and the outer end of the guide rod 5 is provided with the grout outlet hole 8. As shown in the figure, by setting the outer cover 6 and the guide rod 5 as separate structures, the outer cover 6 can be separated from the guide rod 5 during the movement process after the guide rod 5 extends, so as to prevent the outer cover 6 from affecting the secondary grouting.

[0050] Regarding the fixing of the outer cover 6, in the illustrated embodiment, more specifically, as shown in the figure, the outer cover 6 is snapped onto the edge of the grouting hole 4, and the grouting hole 4 is provided with a supporting step 11 to support the outer cover 6. As shown in the figure, this allows the supporting step 11 to support the outer cover 6 when the pile tip 2 enters the soil layer 13, preventing the outer cover 6 from moving inward. When the guide rod 5 extends outward, the guide rod 5 breaks the snapping structure between the outer cover 6 and the grouting hole 4, separating the outer cover 6. Furthermore, this makes it easy for the outer cover 6 to separate from the guide rod 5.

[0051] As shown in the figure, the outer cover 6 and the grouting hole 4 are connected by a retaining ring installed inside the grouting hole 4. The retaining ring is provided with a supporting step 11 and a retaining groove, and the edge of the outer cover 6 is provided with a retaining edge that can be inserted into the retaining groove.

[0052] In the illustrated embodiment, a further optimization is that the pile tip 2 is provided with a connecting rope 12 that is connected to the outer cover 6.

[0053] As shown in the figure, by setting the connecting rope 12, the outer cover 6 can be constrained at the pile tip 2 position during the outward extension of the grout guide rod 5, further ensuring the separation of the grout guide rod 5 and the outer cover 6.

[0054] Regarding the setting of the grouting hole 4, in the illustrated embodiment, more specifically, as shown in the figure, the grouting hole 4 is set to be inclined downwards.

[0055] As shown in the figure, this allows the guide rod 5 to extend downwards at an angle, which increases the length of the guide rod 5.

[0056] In the illustrated embodiment, a further optimization is that at least four grouting holes 4 are evenly spaced along the circumference of the pile tip 2, and each grouting hole 4 is equipped with a grout guide rod 5 and a limiting block 7. As shown in the figure, by controlling the number of grouting holes, the secondary grouting reinforcement can be made more balanced and stable, and the secondary grouting can more easily diffuse into the soil layer 13 around the pile tip 2 to form a whole.

[0057] The above specific embodiments should not be construed as limiting the scope of protection of the present invention. For those skilled in the art, any alternative improvements or modifications made to the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0058] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A grouting device suitable for post-stabilization of vibratory driven cast-in-place piles, characterized in that, The pile includes a pile body and a pile tip. The pile tip is provided with a grouting cavity. The side wall of the pile tip is provided with a grouting hole that communicates with the grouting cavity. The pile tip is provided with an annular bladder above the grouting hole. The annular bladder is connected to a grouting pipe. The annular bladder can expand and contract on the surface of the pile tip. After grouting, the annular bladder can expand out of the surface of the pile tip. The pile tip is provided with an annular groove for installing the annular bladder, and the post-grouting device further includes a protective plate covering the annular groove. The protective plate includes a plurality of protective plate portions spaced apart along the circumference of the pile tip, and the protective plate portions are configured to be separable from the annular groove. The protective plate is engaged with the annular groove; The protective plate includes: An arc-shaped cover fits into the annular bladder, and both ends of the arc-shaped cover abut against the pile tip radially along the pile tip to prevent the arc-shaped cover from moving inward; Two outer plates are spaced apart along the length of the pile body. The outer ends of the outer plates are snapped into the edge of the annular groove, and the inner ends are connected to the arc-shaped cover. The outer plate and the arc-shaped cover are connected in such a way that when the arc-shaped cover is pushed outward by the ring bag with a set force, the outer plate separates from the arc-shaped cover.

2. The grouting device for stabilization of vibratory driven cast-in-place piles according to claim 1, characterized in that: The outer plate is welded to the arc-shaped cover.

3. The grouting device for stabilization of vibratory driven cast-in-place piles according to claim 1, characterized in that: The pile tip includes a pointed cone portion and a cylindrical portion disposed on the upper side of the pointed cone portion, and the annular bladder is installed on the cylindrical portion.

4. A grouting device for stabilization of vibratory driven cast-in-place piles according to claim 1, characterized in that: The post-grouting device also includes a slidable guide rod disposed in the grouting hole. One end of the guide rod is provided with an outer cover covering the grouting hole, and the other end is provided with a limiting block. The limiting block is slidably engaged with the grouting hole so that when the pressure on the side of the limiting block away from the guide rod is greater than a set value, the limiting block pushes the guide rod to move outward from the pile tip.

5. A grouting device for stabilization of vibratory driven cast-in-place piles according to claim 4, characterized in that: The grout guide rod is hollow and has a grout outlet hole. The grout guide rod is open to one side of the limiting block. When the grout guide rod moves to the outside of the pile tip, at least part of the grout outlet hole is located outside the pile tip. The limiting block can switch between a first state of closing the guide rod and a second state of opening the guide rod.

6. A grouting device for stabilization of vibratory driven cast-in-place piles according to claim 5, characterized in that: The limiting block includes: An outer block is installed on the grout guide rod and has a through hole communicating with the grout guide rod. The outer block can slide with the grouting hole. A valve plate is mounted on the outer block and covers the through hole; A traction rope is connected to the valve plate and extends to the upper side of the pile tip.

7. A grouting device for stabilization of vibratory driven cast-in-place piles according to claim 6, characterized in that: The valve plate is magnetically connected to the outer block.

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