A vibrating pipe sinking grouting structure and a grouting method

Abstract

The application belongs to the field of civil construction equipment, and particularly relates to a vibrating pipe sinking and grouting structure and a grouting method. The structure comprises 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 communicated with the grouting cavity. The grouting structure further comprises a grout guide rod slidably arranged in the grouting hole. One end of the grout guide rod is provided with an outer cover covering the grouting hole, and the other end of the grout guide rod is provided with a limiting block. The limiting block is in sliding fit with the grouting hole, so that when the pressure on the side of the limiting block away from the grout guide rod is greater than a set value, the limiting block pushes the grout guide rod to move outward of the pile tip. The application further provides a grouting method. The application can improve the stability and balance of secondary grouting by arranging the telescopic grout guide rod, and effectively solves the problems in the prior art.

Description

Technical fields:

[0001] This invention relates to the field of civil engineering construction equipment, and in particular to a vibratory pipe grouting structure and grouting method. Background technology:

[0002] 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.

[0003] 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.

[0004] After the piles are formed, holes are drilled on both sides of the piles to lay pipes and grout 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. Summary of the Invention:

[0005] This invention provides a vibratory submerged pipe grouting structure and grouting method. By setting a telescopic grout guide rod, the stability and uniformity of secondary grouting can be improved, effectively solving the problems existing in the prior art.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a vibratory driven pipe grouting structure, including 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 grouting structure 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 of the pile tip.

[0007] Furthermore, the grout guide rod is hollow and has a grout outlet hole. The grout guide rod is open to one 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.

[0008] Furthermore, the limiting block includes: an outer quick body, installed on the grout guide rod, having a through hole communicating with the grout guide rod, the outer quick body being able to slide with the grouting hole; a valve plate, installed on the outer quick 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.

[0009] Furthermore, the valve plate is magnetically connected to the outer block.

[0010] Furthermore, the guide rod and the outer cover are separate structures, and the outer end of the guide rod is provided with the slurry outlet hole.

[0011] Furthermore, the outer cover is snapped onto the edge of the grouting hole, and a supporting step for supporting the outer cover is provided inside the grouting hole.

[0012] Furthermore, the pile tip is provided with a connecting rope that is connected to the outer cover.

[0013] Furthermore, the grouting hole is configured to slope downwards.

[0014] Furthermore, at least four grouting holes are provided at equal intervals along the circumference of the pile tip, and each grouting hole is provided with a grout guide rod and a limiting block.

[0015] The present invention also provides a grouting method, which applies the vibration-assisted submerged tube grouting structure described above, comprising:

[0016] S1. Vibrate the pile body and pile tip to sink them in the soil layer;

[0017] S2. Insert steel bars into the pile body, grout, and then lift the pile body.

[0018] S3. Pressurized water is applied into the grouting cavity to push the guide rod outward to the set position;

[0019] S4. After the grouting at the rebar position is completed, pull the valve plate upward with the traction rope to open the grout guide rod;

[0020] S5. Inject grout into the grouting cavity so that the grout outlet of the grouting rod can discharge grout into the soil layer.

[0021] The beneficial effect of this invention is that by setting a telescopic grout guide rod, the stability and uniformity of secondary grouting can be improved, 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 The diagram shows the structure after the guide rod is pushed out in the embodiment shown.

[0025] 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 body; 702. Valve plate; 8. Grout outlet hole; 9. Traction rope; 10. Through hole; 11. Supporting step; 12. Connecting rope; 13. Soil layer. Detailed implementation method:

[0026] 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.

[0027] The embodiments of the present invention are as follows Figure 1-3 As shown, a vibratory driven pipe grouting structure includes a pile body 1 and a pile tip 2. The pile tip 2 is provided with a grouting cavity 3. The side wall of the pile tip 2 is provided with a grouting hole 4 communicating with the grouting cavity 3. The grouting structure also includes a grout guide rod 5 slidably disposed in the grouting hole 4. One end of the grout 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 grout guide rod 5 is greater than a set value, the limiting block 7 pushes the grout guide rod 5 to move outward from the pile tip 2.

[0028] In use, the grouting structure of this invention involves sinking the pile body 1 and pile tip 2 into the soil layer 13, and inserting reinforcing bars into the pile body 1 for casting. During the casting process, the pile body 1 is moved upwards. Before the pile body 1 has completely solidified, a pressure medium is introduced into the grouting cavity 3 and 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 rod 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.

[0029] This invention, by setting a retractable grout guide rod 5, allows the outer cover 6 to maintain the shape stability of the pile tip 2 during pile driving, protecting the grout guide rod. After the grout guide rod 5 extends, it can penetrate the unformed inner concrete layer at the pile tip 2, preventing the grout guide rod 5 from being unable to extend after the inner concrete layer near the pile tip 2 has stabilized. The grout guide rod 5 can extend to the surrounding soil layer 13. Compared to some cases where the soil layer 13 at the pile tip 2 has uneven integrity, resulting in most of the secondary grout being injected into the broken area, this invention can increase the uniformity and depth of the grout diffusion around the pile tip 2 during secondary grouting, making the secondary reinforcement of the pile tip 2 more stable.

[0030] 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.

[0031] 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.

[0032] In the illustrated embodiment, the limiting block 7 specifically includes: an outer quick-release body 701, installed on the grout guide rod 5, having a through hole 10 communicating with the grout guide rod 5, the outer quick-release body 701 being able to slide with the grouting hole 4; a valve plate 702, installed on the outer quick-release body 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.

[0033] As shown in the figure, a secondary grouting pipe is installed inside the pile body. The traction rope 9 extends from the secondary grouting pipe to the upper side. During use, pressurized water can be injected to push the limiting block, 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.

[0034] A further optimization in the illustrated embodiment is that, as shown, the valve plate 702 is magnetically connected to the outer block. 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 injection of pressurized medium, caused by the valve plate 702 falling off, can be prevented. Specifically, the magnetic connection between the valve plate 702 and the outer block can be achieved by providing a magnet on the outer block and an iron component on the valve plate 702.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Regarding the configuration of the grouting hole 4, in the illustrated embodiment, more specifically, as shown in the figure, the grouting hole 4 is configured to be inclined downwards.

[0041] 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.

[0042] 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.

[0043] The present invention also provides a grouting method, which applies the vibratory driven pipe grouting structure in the above embodiments, including: S1, vibrating and sinking the pile body 1 and the pile tip 2 in the soil layer 13;

[0044] S2. Insert steel bars into pile body 1, grout, and lift pile body 1.

[0045] S3. Pressurized water is applied into the grouting chamber 3 to push the guide rod outward to the set position;

[0046] S4. After the grouting at the rebar position is completed, pull the valve plate upward with the traction rope to open the grout guide rod 5;

[0047] S5. Inject grout into the grouting cavity 3 so that the grout outlet 8 of the grout guide rod 5 can discharge grout into the soil layer 13.

[0048] 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.

[0049] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A vibratory submerged pipe grouting structure, characterized in that, The system includes a pile body and a pile tip. 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 grouting structure also includes a grout guide rod slidably disposed in the grouting hole. One end of the grout 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 grout guide rod is greater than a set value, the limiting block pushes the grout guide rod to move outward from the pile tip. 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; 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.

2. The vibratory submerged pipe grouting structure according to claim 1, characterized in that: The valve plate is magnetically connected to the outer block.

3. The vibratory submerged pipe grouting structure according to claim 1, characterized in that: The guide rod and the outer cover are separate structures, and the outer end of the guide rod is provided with the slurry outlet hole.

4. The vibratory submerged pipe grouting structure according to claim 3, characterized in that: The outer cover is snapped onto the edge of the grouting hole, and a supporting step is provided inside the grouting hole to support the outer cover.

5. The vibratory submerged pipe grouting structure according to claim 4, characterized in that: The pile tip is equipped with a connecting rope that is connected to the outer cover.

6. The vibratory submerged pipe grouting structure according to claim 1, characterized in that: The grouting hole is designed to be inclined downwards.

7. The vibratory submerged pipe grouting structure according to claim 6, characterized in that: At least four grouting holes are provided at equal intervals along the circumference of the pile tip, and each grouting hole is provided with a grout guide rod and a limiting block.

8. A grouting method, characterized in that, The vibratory submerged grouting structure according to any one of claims 2-7 comprises: S1. Vibrate the pile body and pile tip to sink them in the soil layer; S2. Insert steel bars into the pile body, grout, and then lift the pile body. S3. Pressurized water is applied into the grouting cavity to push the guide rod outward to the set position; S4. After the grouting at the rebar position is completed, pull the valve plate upward with the traction rope to open the grout guide rod; S5. Inject grout into the grouting cavity so that the grout outlet of the grouting rod can discharge grout into the soil layer.

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