A prefabricated pile tip capable of multi-directional grouting

Abstract

The present invention discloses a prefabricated pile tip capable of multi-directional grouting, which comprises a pile tip body arranged on the prefabricated pile, the pile tip body being provided with a grouting structure for grouting into a soft soil layer, the grouting structure being arranged on the pile tip body in a circumferential rotation; the pile tip body is also provided with a conduit for transporting concrete slurry; the prefabricated pile is cylindrical, the conduit is detachably installed in the prefabricated pile and the conduit is detachably installed on the grouting structure, the conduit is connected to the grouting structure and transports concrete slurry to the grouting structure. The present application has the effect of expanding the grouting range of the pile tip body to improve the bearing capacity of the prefabricated pile.

Description

Technical Field

[0001] The invention relates to the field of prefabricated pile sinking construction, in particular to a prefabricated pile tip capable of multi-directional grouting. Background Art

[0002] Precast pile tip is a pile tip made of reinforced concrete or prestressed concrete, usually set on precast piles, used to reinforce soil or foundation to increase the bearing capacity and stability of the foundation. Precast pile tips are usually driven at the construction site. Through vibration or static friction, the pile tip is inserted deep into the soil to form a solid foundation support system. When precast piles are sunk, they often encounter strata such as gravel soil layers and hard plastic clay soil layers, which make it difficult for the precast piles to sink and unable to reach the designed elevation. Or there are unfavorable geological conditions with a hard shell layer on the upper part and a soft soil layer on the lower part, making it difficult to sink the piles in the hard shell layer and the bearing capacity of the foundation in the soft layer is insufficient. Therefore, it is necessary to inject water to assist the sinking of the precast piles when it is difficult to sink, and to inject grouting to increase the bearing capacity after sinking to the soft soil layer at the designed elevation.

[0003] However, in the prior art, the same pipe is used for water injection and grouting, and the grouting direction is fixed. The concrete slurry injected into the soft soil layer automatically flows and diffuses around the precast pile tip, which limits the grouting range of the precast pile tip. The bearing capacity of the precast pile is limited. Therefore, there is still room for improvement. Summary of the invention

[0004] In order to expand the grouting range of the pile tip body to improve the bearing capacity of the precast pile, the present application provides a precast pile tip capable of multi-directional grouting.

[0005] The present application provides a prefabricated pile tip capable of multi-directional grouting, which adopts the following technical solution:

[0006] A prefabricated pile tip capable of multi-directional grouting comprises a pile tip body arranged on the prefabricated pile, the pile tip body being provided with a grouting structure for grouting into a soft soil layer, the grouting structure being arranged on the pile tip body to rotate around; the pile tip body is also provided with a conduit for transporting concrete slurry; the prefabricated pile is cylindrical, the conduit is detachably installed in the prefabricated pile and the conduit is detachably installed on the grouting structure, the conduit is connected to the grouting structure and transports concrete slurry to the grouting structure.

[0007] By adopting the above technical solution, a grouting structure is set on the pile tip body, and concrete slurry is transported to the grouting structure through a conduit. Then, the concrete slurry can be injected into the soft soil layer by using the grouting structure. After the concrete slurry solidifies, the bearing capacity of the precast pile can be improved. At the same time, the grouting structure is rotatably set on the pile tip body, so that the grouting structure can grout in multiple directions, thereby expanding the grouting range of the pile tip body and further improving the bearing capacity of the precast pile. At the same time, the conduit can be detachably installed on the precast pile and the grouting structure, and the conduit can be easily recovered after the grouting is completed, thereby facilitating the recycling of resources.

[0008] Preferably, the grouting structure is a grouting turntable rotatably arranged on the pile tip body, and the grouting turntable is provided with a plurality of grouting nozzles for injecting concrete slurry into the soft soil layer; the conduit is connected to the grouting nozzles, and the conduit is used to transport the concrete slurry to the grouting nozzles.

[0009] By adopting the above technical solution, the grouting structure is set as a grouting turntable, and by arranging a plurality of grouting nozzles on the grouting turntable, the concrete slurry transported to the grouting turntable can be injected into the soft soil layer. The structure is simple, which is convenient for reducing the cost of making the pile tip body, thereby reducing the cost expenditure required for each piling.

[0010] Preferably, the grouting turntable is slidably provided with a closing cylinder, and the closing cylinder is used to temporarily close a plurality of the grouting nozzles and prevent sand in the soil layer from flowing into the interior of the plurality of the grouting nozzles.

[0011] By adopting the above technical solution, when the prefabricated pile and the pile tip body are driven into the soft soil layer, the sand in the soft soil layer is easily pressed into the grouting nozzle, which is easy to block the grouting nozzle and thus hinder the grouting nozzle from grouting into the soft soil layer. By setting a sealing cylinder to temporarily close a number of grouting nozzles to prevent the sand in the soil layer from flowing into the grouting nozzle, it is convenient for the grouting nozzle to grout into the soft soil layer.

[0012] Preferably, the grouting turntable is provided with a connecting groove for connecting the conduit, a plurality of the grouting nozzles are connected to the connecting groove and are located on the side wall of the connecting groove, a closing groove is provided on the bottom wall of the connecting groove for the movement of the closing tube, the closing groove is provided with a first spring for driving the closing tube to extend out of the closing groove and a limiting ring for limiting the closing tube from detaching from the closing groove, one end of the first spring is connected to the bottom wall of the closing groove, and the other end is connected to a side of the closing tube close to the bottom wall of the closing groove, and the first spring is always in a compressed state, when the closing tube extends out of the closing groove to the limit state, the closing tube isolates a plurality of the grouting nozzles and the connecting groove, and the outer wall of the closing tube abuts against the side wall of the closing groove; a plurality of pushing rods are provided on the end of the conduit for being inserted into the connecting groove, and when the conduit is inserted into the connecting groove, the plurality of pushing rods drive the closing tube to extend into the closing groove.

[0013] By adopting the above technical solution, when the prefabricated pile and the pile tip body are driven into the soft soil layer, the first spring drives the closing cylinder to extend out of the closing groove and close several grouting nozzles, making it difficult for sand to enter the connecting groove. When grouting is required in the soft soil layer, the closing cylinder is driven into the closing groove by the push rod, thereby connecting the grouting nozzle and the connecting groove, and high-pressure slurry is injected into the connecting groove by the conduit, so that the sand in the grouting nozzle and the concrete slurry transported by the conduit can be injected into the soft soil layer, which is convenient for operation. There is a gap between the push rods to reduce the situation where the push rods affect the grouting effect due to closing the grouting nozzles.

[0014] Preferably, the side wall of the connecting groove is provided with a plurality of snap-in grooves; one end of the conduit is movably provided with a plurality of snap-in plates for respectively snapping into the plurality of snap-in grooves, one end of the conduit provided with the snap-in plate is snapped into the connecting groove, and the plurality of snap-in plates are respectively snapped into the plurality of snap-in grooves, and the grouting turntable is driven to rotate by rotating the conduit.

[0015] By adopting the above technical solution, the snap-in plate is snapped into the snap-in groove, so that the grouting turntable can be driven to rotate when the catheter is rotated, thereby reducing the structure of the pile tip body to drive the grouting turntable to rotate, thereby reducing the structure of the pile tip body, which is conducive to further reducing the cost of manufacturing the pile tip body.

[0016] Preferably, the clamping plate is in the shape of a semicircular plate, and the axial direction of the clamping plate is perpendicular to the axial direction of the conduit; the conduit is also provided with a plurality of receiving grooves for accommodating a plurality of the clamping plates, and the plurality of the clamping plates are respectively located in the plurality of receiving grooves; the receiving groove is also provided with a second spring and a limiting block that limits the clamping plate from detaching from the receiving groove, one end of the second spring is connected to the bottom wall of the receiving groove, and the other end is connected to a side of the clamping plate close to the bottom wall of the receiving groove, the second spring is always in a compressed state, and when the clamping plate extends out of the receiving groove to the limit state and the conduit is clamped in the connecting groove, the clamping plate extends out of the receiving groove and is clamped into the clamping groove, the closing tube extends into the closing groove and connects a plurality of the grouting nozzles and the connecting groove, and the clamping plate can be fully extended into the receiving groove.

[0017] By adopting the above technical solution, when the catheter is inserted into the precast pile and then into the pile tip body, the clamping plate is squeezed by the inner wall of the precast pile and is received in the receiving groove, reducing the impact of the clamping plate on the installation of the catheter due to its rigidity. At the same time, the catheter can abut against the inner wall of the precast pile after installation, thereby improving the stability of the catheter in conveying concrete slurry. At the same time, when the catheter is rotated to a plurality of clamping plates facing a plurality of clamping grooves respectively, the second spring drives the clamping plate to clamp into the clamping groove, which is convenient for the catheter to be installed in the connecting groove. At the same time, the clamping plate is semicircular, so that the catheter can be easily inserted into the receiving groove when it moves along the axial direction of the precast pile, and when the catheter rotates along the circumference of the precast pile, the clamping plate is difficult to insert into the receiving groove, which is convenient for the catheter to be installed on the grouting turntable.

[0018] Preferably, the tube wall of the catheter is provided with a plurality of locking holes, and the plurality of the locking holes are respectively connected to the plurality of the receiving grooves; the tube wall of the catheter is also slidably provided with a plurality of locking rods, and the plurality of the locking rods are respectively located in the plurality of the locking holes, and the catheter is also provided with a driving member for driving the locking rod to extend into or out of the receiving groove, when the second spring drives the clamping plate to extend out of the receiving groove to the limit state and the clamping rod extends into the receiving groove, the two sides of the portion of the clamping rod extending into the receiving groove respectively abut against the clamping plate and the bottom wall of the receiving groove, and restrict the clamping plate from extending into the receiving groove.

[0019] By adopting the above technical solution, when high-pressure grouting is adopted, the pressure of the concrete slurry in the connection groove is large, which can easily drive the catheter to extend out of the connection groove along the axial direction of the precast pile, and the clamping plate can easily extend into the receiving groove, so that the catheter can easily be separated from the connection groove, affecting the grouting process. After the clamping plate is clamped into the clamping groove, the clamping rod is clamped between the clamping plate and the bottom wall of the receiving groove, thereby limiting the clamping plate from extending into the receiving groove, thereby improving the stability of the connection between the catheter and the grouting turntable during high-pressure grouting.

[0020] Preferably, the driving member is a driving ring threadedly connected to the outer wall of the conduit, and a plurality of the clamping rods are slidably disposed on the driving ring at ends away from the clamping plate.

[0021] By adopting the above technical solution, the driving ring is rotated on the ground, and the positioning rod is driven by the driving ring to move, which is easy to operate and convenient to improve construction efficiency. At the same time, the driving ring is threadedly connected to the catheter, and the relative position of the positioning rod and the catheter can be fixed by adjusting the relative position of the driving ring and the catheter, so as to avoid the automatic displacement of the positioning rod during the operation of the catheter, and further improve the stability of the connection between the catheter and the grouting turntable during the high-pressure grouting process.

[0022] Preferably, the outer wall of the grouting turntable is also provided with a plurality of scrapers.

[0023] By adopting the above technical solution, when the grouting turntable rotates, it drives the scraper to rotate, thereby scraping the sand near the grouting turntable, thereby facilitating the grouting nozzle to grout the sand near it and discharge the sand in the grouting nozzle.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. By setting up a grouting structure and a conduit, the concrete slurry is transported to the grouting structure through the conduit, and then the concrete slurry can be injected into the soft soil layer by using the grouting structure. After the concrete slurry solidifies, the bearing capacity of the precast pile can be improved. At the same time, the grouting structure is rotatably arranged on the pile tip body, so that the grouting structure can grout in multiple directions, thereby expanding the grouting range of the pile tip body and further improving the bearing capacity of the precast pile; at the same time, the conduit can be detachably installed on the precast pile and the grouting structure, and it is convenient to recycle the conduit after the grouting is completed, thereby facilitating the recycling of resources.

[0026] 2. By providing the clamping plate, the receiving groove, the second spring, the clamping hole, the clamping rod and the driving ring, the grouting turntable can be driven to rotate when the catheter is rotated, and the structure for driving the grouting turntable to rotate is reduced, thereby reducing the structure of the pile tip body, which is conducive to reducing the cost of making the pile tip body. At the same time, the catheter can abut against the inner wall of the prefabricated pile after installation, and the driving ring is threadedly connected to the catheter. The relative position of the clamping rod and the catheter can be fixed by adjusting the relative position of the driving ring and the catheter, avoiding the situation where the clamping rod automatically deviates during the operation of the catheter, and improving the stability of the catheter in conveying concrete slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the pile tip body installed on the prefabricated pile in the embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of the internal structure of the pile tip body installed on the prefabricated pile in the embodiment of the present application.

[0029] Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0030] Figure 4 yes Figure 3 Enlarged view of part B in the middle.

[0031] Figure 5 yes Figure 2 Enlarged view of part C in the middle.

[0032] Description of reference numerals:

[0033] 1. Pile tip body; 11. Flange; 111. Connecting ring; 112. Limiting ring; 12. Grouting turntable; 121. Grouting nozzle; 122. Scraper; 123. Closing groove; 124. Limiting groove; 125. First spring; 126. Closing cylinder; 127. Limiting ring; 128. Connecting groove; 2. Precast pile; 21. Threaded groove; 3. Conduit; 31. Positioning rod; 311. Linking ring; 32. Push rod; 33. Limiting block; 34. Receiving groove; 35. Second spring; 36. Snap-in plate; 37. Driving groove; 4. Driving ring. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-5 This application is described in further detail.

[0035] The present application embodiment discloses a prefabricated pile tip capable of multi-directional grouting. Figure 1-3 The tip of the precast pile 2 capable of multi-directional grouting includes a pile tip body 1 detachably mounted on the precast pile 2, and the pile tip body 1 is provided with a grouting structure for grouting into a soft soil layer. In this embodiment, the pile tip body 1 is composed of a flange 11 detachably mounted on the end of the precast pile 2 and a grouting turntable 12 rotatably connected to one side of the flange 11, and the grouting structure is the grouting turntable 12. The grouting turntable 12 is in the shape of a cone, and a connecting ring 111 protrudes from one side of the cone bottom of the grouting turntable 12, and a limiting ring 112 protrudes from the side of the connecting ring 111 away from the grouting turntable 12; a splicing groove (not shown in the figure) is recessed on the side of the flange 11 close to the grouting turntable 12 for the connecting ring 111 to be inserted into, and the splicing groove is annular, and the center of the splicing groove coincides with the center of the flange 11; the side wall of the splicing groove is also recessed with an annular groove (not shown in the figure) for the limiting ring 112 to be inserted into, and the connecting ring 111 is inserted into the splicing groove and the limiting ring 112 is inserted into the annular groove, so that the grouting turntable 12 is rotatably connected to the flange 11. The precast pile 2 is in the shape of a cylinder, and a plurality of threaded grooves 21 are also provided at one end of the precast pile 2 for connecting the pile tip body 1, so that the flange 11 is installed on the precast pile 2 by bolts, so that the precast pile 2 body is installed on the precast pile 2 by bolts.

[0036] Reference Figure 2 as well as Figure 3, a circular through hole is left at the center of the flange 11, and a connecting groove 128 is recessed at the bottom of the grouting turntable 12. The connecting groove 128 is cylindrical, and the center of the pointed bottom of the precast pile 2 is located on the axis of the connecting groove 128. The diameter of the connecting groove 128 is consistent with the diameter of the circular through hole of the flange 11, and the connecting groove 128 is directly opposite to the circular through hole of the flange 11. The grouting turntable 12 is also provided with a plurality of grouting nozzles 121. In this embodiment, the grouting nozzles 121 are cylindrical holes, and the axial direction of the grouting nozzles 121 is parallel to the radial direction of the bottom of the grouting turntable 12. There are three grouting nozzles 121, and the openings at one end of the three grouting nozzles 121 are located on the side wall of the connecting groove 128, so that the three grouting nozzles 121 are all connected to the connecting groove 128; the three grouting nozzles 121 are evenly distributed along the circumference of the connecting groove 128, and the three grouting nozzles 121 are all located at the same depth of the connecting groove 128.

[0037] Reference Figure 2 as well as Figure 3 The pile tip body 1 can also be detachably installed with a conduit 3 for transporting concrete slurry. The outer diameter of the conduit 3 is consistent with the diameter of the connecting groove 128. One end of the conduit 3 can be inserted into the circular through hole of the flange 11 and the connecting groove 128. Concrete slurry is injected into the connecting groove 128 through the conduit 3, and the concrete slurry is injected into the soft soil layer through the connecting groove 128 and the grouting nozzle 121.

[0038] Reference Figure 2 as well as Figure 3 The bottom wall of the connecting groove 128 is also slidably connected with a closing cylinder 126. The outer diameter of the closing cylinder 126 is consistent with the diameter of the connecting groove 128, and the axis of the closing cylinder 126 coincides with the axis of the connecting groove 128. The bottom wall of the connecting groove 128 is also recessed with a closing groove 123 for the closing cylinder 126 to move. The closing groove 123 is cylindrical, and the closing cylinder 126 can extend into and out of the closing groove 123. A limiting ring 127 is sleeved and fixed on one end of the closing cylinder 126 close to the bottom wall of the closing groove 123. The side wall of the closing groove 123 is also recessed with a limiting groove 124 for the limiting ring 127 to move axially along the closing groove 123. The limiting groove 124 is cylindrical, and the axis of the limiting groove 124 coincides with the axis of the closing groove 123. The limiting ring 127 and the limiting groove 124 restrict the closing cylinder 126 from leaving the closing groove 123. The bottom wall of the closed groove 123 is also fixedly connected with a first spring 125, one end of the first spring 125 is fixedly connected to the bottom wall of the closed groove 123, and the other end is fixedly connected to the limiting ring 127 and the side of the closed tube 126 close to the closed groove 123, and the first spring 125 is always in a compressed state. When the closing strip extends out of the closed groove 123 to the limit state, the outer wall of the closed tube 126 abuts against the side wall of the closed groove 123, and the closed tube 126 blocks all the grouting nozzles 121, so that the closed tube 126 separates all the grouting nozzles 121 and the connecting groove 128, thereby preventing the sand in the soil layer from flowing from the grouting nozzle 121 into the closed groove 123.

[0039] Reference Figure 2 as well as Figure 3 A plurality of push rods 32 are protruded from the end of the conduit 3 for inserting into the connection groove 128. In this embodiment, there are seven push rods 32, and four push rods 32 are evenly distributed along the circumference of the conduit 3. When the conduit 3 is inserted into the connection groove 128, the push rods 32 push the sealing tube 126 into the sealing groove 123 and connect the grouting nozzle 121 and the connection groove 128.

[0040] Reference Figure 2 as well as Figure 3 A plurality of snap-in grooves (not shown in the figure) are provided on the side wall of the connecting groove 128. In the present embodiment, the snap-in groove is in the shape of a semicircle, and the axial direction of the snap-in groove is perpendicular to the axial direction of the connecting groove 128. The snap-in groove is located between the grouting nozzle 121 and the notch of the connecting groove 128. There are four snap-in grooves, and the four snap-in grooves are all located at the same depth of the connecting groove 128, and the four snap-in grooves are evenly distributed along the circumference of the connecting groove 128.

[0041] Reference Figure 2-4 The outer side of the end of the conduit 3 for snapping into the connection groove 128 is movably connected with a plurality of snap-on plates 36. In this embodiment, the snap-on plates 36 are in the shape of a semicircle. The axial direction of the snap-on plates 36 is perpendicular to the axial direction of the conduit 3. There are four snap-on plates 36, and the four snap-on plates 36 are evenly distributed along the circumference of the conduit 3. Each snap-on plate 36 has a limiting block 33 protruding from the radial plane. The outer wall of the conduit 3 is also recessed with a receiving groove 34 for the limiting block 33 to extend into. There are four receiving grooves 34. The four snap-on plates 36 are respectively located in the four receiving grooves 34, and the snap-on plates 36 can extend into the receiving grooves 34. The two sides of the notch of the receiving groove 34 along the width direction are closed and abut against the two sides of the snap-on plates 36 along the thickness direction, so that the limiting block 33 is located in the receiving groove 34 and moves and limits the snap-on plates 36 from leaving the receiving groove 34.

[0042] Reference Figure 2 as well as Figure 4 The bottom wall of the receiving groove 34 is also fixedly connected to a second spring 35, one end of the second spring 35 is fixedly connected to the bottom wall of the receiving groove 34, and the other end is fixedly connected to a side of the limiting block 33 close to the bottom wall of the receiving groove 34, so that the second spring 35 is fixedly connected to the clamping plate 36 through the limiting block 33, and the second spring 35 is always in a compressed state and always drives the clamping plate 36 to extend out of the receiving groove 34. When the conduit 3 is clamped into the connecting groove 128, the four clamping plates 36 are respectively clamped into the four clamping grooves, so that the grouting turntable 12 is driven to rotate by rotating the conduit 3.

[0043] Reference Figure 2 as well as Figure 5The outer wall of the end of the conduit 3 away from the push rod 32 is recessed with a driving groove 37, which is annular and has an external thread on the bottom wall. The conduit 3 is also provided with a plurality of positioning holes (not shown in the figure). In this embodiment, there are four positioning holes, one end of which is connected to the four receiving grooves 34 respectively, and the other end is connected to the driving groove 37. A positioning rod 31 is slidably connected in each positioning hole.

[0044] Reference Figure 2 as well as Figure 5 The bottom wall of the driving groove 37 is also threadedly connected with a driving member for driving the locking rod 31 to extend into or out of the receiving groove 34. In this embodiment, the driving member is a driving ring 4 threadedly connected to the bottom wall of the driving groove 37. The driving ring 4 is recessed with a locking groove (not shown in the figure) for the locking rod 31 to be locked in on one side of the locking rod 31. The side wall of the locking groove is also recessed with a linkage groove (not shown in the figure). The locking groove and the linkage groove are both annular. A linkage block protrudes from one end of the locking rod 31 that is locked in the locking groove. The linkage block is locked in the linkage groove, so that the locking rod 31 rotates relative to the driving ring 4 through the locking groove, and at the same time, the locking rod 31 moves synchronously with the driving ring 4 along the axial direction of the catheter 3 through the linkage block and the linkage groove. When the second spring 35 drives the clamping plate 36 to extend out of the receiving groove 34 to the limit state and the clamping rod 31 extends into the receiving groove 34, the two sides of the part of the clamping rod 31 extending into the receiving groove 34 respectively abut against one side of the limiting block 33 close to the bottom wall of the receiving groove 34 and the bottom wall of the receiving groove 34, and limit the clamping plate 36 from extending into the receiving groove 34, thereby preventing the clamping plate 36 from automatically being retracted into the receiving groove 34 when high-pressure grouting is used.

[0045] Reference Figure 2 as well as Figure 3 A plurality of scrapers 122 are also fixed to the outer wall of the grouting turntable 12. In the present embodiment, three scrapers 122 are fixed to the outer wall of the grouting turntable 12, and the three scrapers 122 are respectively located between the three grouting nozzles 121, so that when the grouting turntable 12 rotates, the scrapers 122 can penetrate the soil near the grouting turntable 12, making it easier for the grouting nozzles 121 to grout the soft soil layer.

[0046] The implementation principle of a prefabricated pile tip capable of multi-directional grouting in the embodiment of the present application is as follows:

[0047] When it is necessary to drive piles into the soft soil layer, the flange 11 is first fixed to the end of the precast pile 2 by bolts, so that the pile tip body 1 is installed on the precast pile 2. Then the precast pile 2 is driven into the soft soil layer until the precast pile 2 is driven to the expected position, and then the guide tube 3 is inserted into the precast pile 2. During this process, the clamping plate 36 is squeezed by the inner wall of the precast pile 2 and extends into the receiving groove 34, and the guide tube 3 is rotated during the insertion of the guide tube 3 until the four receiving grooves 34 are respectively opposite to the four clamping grooves, and the first spring 125 drives the clamping plate 36 to extend into the receiving groove 34 and clamp into the clamping groove, so that the grouting turntable 12 is driven to rotate synchronously when the guide tube 3 is rotated; and during the process of the guide tube 3 extending into the connecting groove 128, the closing cylinder 126 is driven by the push rod 32 to extend into the closing groove 123, and the grouting nozzle 121 and the connecting groove 128 are connected.

[0048] Then rotate the driving ring 4 to make it move toward the grouting turntable 12, and the locking rod 31 rotates relative to the driving ring 4 through the locking groove. At the same time, the locking rod 31 moves synchronously with the driving ring 4 along the axial direction of the catheter 3 through the linkage block and the linkage groove until the locking rod 31 extends into the receiving groove 34. The two sides of the part of the locking rod 31 extending into the receiving groove 34 respectively abut against one side of the limiting block 33 close to the bottom wall of the receiving groove 34 and the bottom wall of the receiving groove 34, and limit the clamping plate 36 from extending into the receiving groove 34, thereby preventing the clamping plate 36 from automatically being retracted into the receiving groove 34 when high-pressure grouting is used.

[0049] Then, concrete slurry is introduced into the conduit 3, and the concrete slurry is injected into the soft soil layer through the connecting groove 128 and the grouting nozzle 121; when the conduit 3 is rotated, the grouting turntable 12 can be driven to rotate, and the grouting nozzle 121 grouts in multiple directions and increases the grouting area of ​​the grouting nozzle 121. After the grouting is completed, the driving ring 4 is rotated to drive the locking rod 31 to extend out of the receiving groove 34, and then the conduit 3 is lifted up to retract the conduit 3.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A prefabricated pile tip capable of multi-directional grouting, characterized in that: The invention comprises a pile tip body (1) arranged on a precast pile (2), the pile tip body (1) being provided with a grouting structure for grouting into a soft soil layer, the grouting structure being arranged on the pile tip body (1) in a rotatable manner; the pile tip body (1) is also provided with a conduit (3) for transporting concrete slurry; the precast pile (2) is cylindrical, the conduit (3) is detachably installed in the precast pile (2) and the conduit (3) is detachably installed on the grouting structure, the conduit (3) is connected to the grouting structure and transports concrete slurry to the grouting structure, the grouting structure is a grouting rotor rotatably arranged on the pile tip body (1), The grouting turntable (12) is provided with a plurality of grouting nozzles (121) for injecting concrete slurry into a soft soil layer; the conduit (3) is connected to the grouting nozzles (121), the conduit (3) is used to transport the concrete slurry to the grouting nozzles (121); the grouting turntable (12) is slidably provided with a sealing cylinder (126), the sealing cylinder (126) is used to temporarily seal the plurality of grouting nozzles (121) and prevent sand in the soil layer from flowing into the plurality of grouting nozzles (121); the grouting turntable (12) is provided with a connecting groove (128) for connecting the conduit (3); the plurality of grouting nozzles (121) are connected to the grouting nozzles (121); 21) is connected to the connecting groove (128) and is located on the side wall of the connecting groove (128); the bottom wall of the connecting groove (128) is provided with a closing groove (123) for the closing cylinder (126) to move; the closing groove (123) is provided with a first spring (125) for driving the closing cylinder (126) to extend out of the closing groove (123) and a limiting ring (112) for limiting the closing cylinder (126) from leaving the closing groove (123); one end of the first spring (125) is connected to the bottom wall of the closing groove (123), and the other end is connected to a portion of the closing cylinder (126) near the bottom wall of the closing groove (123). side, and the first spring (125) is always in a compressed state. When the closing tube (126) extends out of the closing groove (123) to the limit state, the closing tube (126) isolates the plurality of grouting nozzles (121) and the connecting groove (128), and the outer wall of the closing tube (126) abuts against the side wall of the closing groove (123); the end of the conduit (3) for being inserted into the connecting groove (128) is provided with a plurality of push rods (32), and when the conduit (3) is inserted into the connecting groove (128), the plurality of push rods (32) drive the closing tube (126) to extend into the closing groove (123).

2. A prefabricated pile tip capable of multi-directional grouting according to claim 1, characterized in that: The side wall of the connection groove (128) is provided with a plurality of snap-in grooves; one end of the conduit (3) is movably provided with a plurality of snap-in plates (36) for respectively snapping into the plurality of snap-in grooves; one end of the conduit (3) provided with the snap-in plate (36) snaps into the connection groove (128); the plurality of snap-in plates (36) snap into the plurality of snap-in grooves respectively; and the grouting turntable (12) is driven to rotate by rotating the conduit (3).

3. A prefabricated pile tip capable of multi-directional grouting according to claim 2, characterized in that: The clamping plate (36) is in the shape of a semicircular plate, and the axial direction of the clamping plate (36) is perpendicular to the axial direction of the conduit (3); the conduit (3) is also provided with a plurality of receiving grooves (34) for receiving a plurality of the clamping plates (36), and the plurality of the clamping plates (36) are respectively located in the plurality of the receiving grooves (34); the receiving groove (34) is also provided with a second spring (35) and a limiting block (33) for limiting the clamping plate (36) from being separated from the receiving groove (34), one end of the second spring (35) is connected to the bottom wall of the receiving groove (34), and the other end is connected to the clamping plate (36) is close to the side of the bottom wall of the receiving groove (34), and the second spring (35) is always in a compressed state. When the clamping plate (36) extends out of the receiving groove (34) to the limit state and the conduit (3) is clamped in the connecting groove (128), the clamping plate (36) extends out of the receiving groove (34) and is clamped in the clamping groove, the closing tube (126) extends into the closing groove (123) and connects a plurality of the grouting nozzles (121) and the connecting groove (128), and the clamping plate (36) can be completely extended into the receiving groove (34).

4. A prefabricated pile tip capable of multi-directional grouting according to claim 3, characterized in that: The tube wall of the conduit (3) is provided with a plurality of locking holes, and the plurality of locking holes are respectively connected to the plurality of receiving grooves (34); the tube wall of the conduit (3) is also slidably provided with a plurality of locking rods (31), and the plurality of locking rods (31) are respectively located in the plurality of locking holes; the conduit (3) is also provided with a driving member for driving the locking rod (31) to extend into or out of the receiving groove (34); when the second spring (35) drives the clamping plate (36) to extend out of the receiving groove (34) to an extreme state and the clamping rod (31) extends into the receiving groove (34), the two sides of the portion of the clamping rod (31) extending into the receiving groove (34) respectively abut against the clamping plate (36) and the bottom wall of the receiving groove (34), and restrict the clamping plate (36) from extending into the receiving groove (34).

5. A prefabricated pile tip capable of multi-directional grouting according to claim 4, characterized in that: The driving member is a driving ring (4) threadedly connected to the outer wall of the conduit (3), and a plurality of the clamping rods (31) are slidably arranged on the driving ring (4) at ends away from the clamping plate (36).

6. The prefabricated pile tip capable of multi-directional grouting according to claim 1, characterized in that: The outer wall of the grouting turntable (12) is also provided with a plurality of scrapers (122).

Images