Prestressed pipe pile and construction method thereof

Abstract

The invention discloses a prestressed pipe pile and a construction method thereof, and relates to the technical field of pile foundation construction. The prestressed pipe pile comprises a prefabricated pipe pile body, a core filling reinforcement cage, a first sleeve, a bearing base and a guide module. The bottom end of the core filling reinforcement cage is fixedly mounted at the outer edge position of the top surface of the bearing base through a first sleeve; a containing gap is formed between every two adjacent first sleeves. The guide module can contract and expand. The guide module is used for limiting the bearing base in the radial direction when expanding, so that an annular gap is formed between the bearing base and the prefabricated pipe pile, and then the problem that the edge position of the bearing base makes contact with and rubs against the inner side wall of the prefabricated pipe pile is avoided. When the guide module moves upwards, the overturning vertical plate is converged inwards, the top end of the guide module is contracted to be of a conical structure, and therefore the probability that the overturning vertical plate is inserted into the first gap of the core filling hoop ring in the ascending process is reduced, namely the probability that the guide module and the core filling reinforcement cage are stuck is reduced, and operation reliability and convenience are improved.

Description

Technical Field

[0001] This invention relates to the field of pile foundation construction technology, specifically to a prestressed pipe pile and its construction method. Background Technology

[0002] Prestressed pipe piles are prestressed concrete piles with a circular cross-section formed by centrifugal and prestressing processes. When using them, the reinforcing steel cage is vertically inserted into the cavity of the prestressed pipe pile, and then concrete is poured in to form the pile.

[0003] The bottom of the filler steel cage is usually equipped with a support plate to fix the bottom of the filler steel cage (in order to tension the filler steel cage) or to seal the inner cavity of the prestressed pipe pile (to prevent grout leakage at the bottom of the filler steel cage, thereby reducing the amount of concrete used).

[0004] When the support plate descends along the inner cavity of the prestressed pipe pile, it will scratch the inner wall of the prestressed pipe pile (the outer wall of the prestressed pipe pile is relatively smooth due to molding, while the inner wall is relatively rough due to centrifugal force molding, so the inner wall of the prestressed pipe pile will form protrusions, grooves and other structures that jam the edge of the support plate). Secondly, it will cause the bottom end of the filler steel cage to bend and deform due to overload and jam with the prestressed pipe pile (after the bottom end of the filler steel cage bends locally, its axis is set radially along the inner cavity of the prestressed pipe pile, resulting in jamming). Thirdly, it will cause the support plate to be tilted and unable to connect with the locking structure at the bottom end of the inner cavity of the prestressed pipe pile (after the bottom end of the filler steel cage bends and deforms, the support plate is set at an angle, so the support plate cannot be circumferentially locked with the locking structure below, so the bottom end of the filler steel cage cannot be fixed, and thus tensioning cannot be performed). Summary of the Invention

[0005] In order to overcome the problem of "friction between the support plate at the bottom of the filled steel cage and the inner wall of the prestressed pipe pile" in the above-mentioned background technology, the present invention provides a prestressed pipe pile and its construction method.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A prestressed pipe pile includes a precast pipe pile, a core-filled steel cage, a first sleeve, a support base, and a guide module. The bottom end of the core-filled steel cage is fixedly installed on the outer edge of the top surface of the support base via the first sleeve. A receiving gap is provided between adjacent first sleeves. The guide module is capable of contraction and expansion. The guide module includes a first base, a tilting plate, and rollers. The first base is detachably installed in the inner cavity of the support base. The bottom end of the tilting plate is rotatably connected to the first base, and the top end is connected to the rollers. The top end of the tilting plate can swing to insert into the receiving gap, so that the rollers can abut against the inner wall of the precast pipe pile.

[0007] As a further optimization of the present invention, the inner cavity of the first base is provided with a first telescopic rod; the flipping upright plate is L-shaped, the top end of the first telescopic rod is rotatably connected to the bent position of the flipping upright plate, and the other end is rotatably connected to the bottom surface of the inner cavity of the first base; the first telescopic rod includes a cylinder, a telescopic shaft inserted into the cylinder, and a piston fixedly disposed at the end of the telescopic shaft; the inner cavity of the cylinder is provided with a pressure-holding fluid, which is used to limit the piston to the top end of the inner cavity of the cylinder to lock the expansion state of the guide module; the side wall of the cylinder is provided with a pressure relief valve, and when the pressure relief valve forms a passage, the pressure-holding fluid can flow out from the inner cavity of the cylinder to release the locking of the guide module.

[0008] As a further optimization of the present invention, a first vertical screw hole is formed in the bottom plate of the first base, and a second screw hole adapted to the first screw hole is formed in the bottom plate of the supporting base; a bottom end plate is provided on the bottom surface of the precast pipe pile, and a third screw hole adapted to the second screw hole is provided on the top surface of the bottom end plate; a stud is threadedly connected in the second screw hole; an upper threaded part and a lower threaded part are provided on the outer side plate of the stud; the stud can rotate until the upper threaded part disengages from the first screw hole and the lower threaded part engages with the third screw hole, so that the supporting base disengages from the first base and connects to the lower end plate.

[0009] As a further optimization of the present invention, the bottom surface of the inner cavity of the first base is provided with an upper protrusion for supporting the first motor; the outer periphery of the upper protrusion is provided with an annular receiving groove for accommodating the pressure-holding fluid.

[0010] As a further optimization of the present invention, the first output shaft of the first motor is fixedly inserted into the inner cavity of the sleeve; the stud is provided with a first blind hole, and the sleeve is inserted into the first blind hole; the first blind hole has a hexagonal cross-section, and the outer surface of the sleeve is in contact with and slidably connected to the inner wall of the first blind hole; the first output shaft transmits torque to the stud through the sleeve; when the stud rotates in the second screw hole, the sleeve moves relative to the first blind hole along the axial direction.

[0011] As a further optimization of the present invention, when the bottom end of the stud engages with the third screw hole, the guide module can move upward until the sleeve is pulled out from the first blind hole.

[0012] As a further optimization of the present invention, it also includes a main sling for suspending the guide module. The bottom end of the main sling is connected to the distribution sling via a distribution plate. The bottom end of the distribution sling is connected to the end of the flip-up plate near the roller. When the flip-up plate is lifted by the distribution sling, the guide module retracts and moves upward along the inner cavity of the core-filling steel cage.

[0013] As a further optimization of the present invention, the supporting base is a cylindrical structure with an open top and a closed bottom; the first base is a cylindrical structure with an open top and a closed bottom.

[0014] As a further optimization of the present invention, a pile tip is installed on the bottom surface of the bottom plate.

[0015] A construction method for prestressed concrete pipe piles, comprising the following steps: S1, drilling a hole; S2, inserting the precast concrete pipe pile into the hole; S3, connecting the support base to the guide module, and then connecting the support base to the core-filling steel cage through the first sleeve; S4, injecting the pressure-holding fluid into the first telescopic rod to rotate the tilting plate into the receiving gap; then closing the pressure relief valve; S5, inserting the core-filling steel cage, the first sleeve, the support base, and the guide module into the precast concrete pipe pile. S6. The stud rotates until the support base is disengaged from the guide module and the support base is connected to the bottom end plate; S7. The pressure relief valve is opened, and the main hoisting cable lifts the guide module upward, causing the guide module to move upward along the inner cavity of the core-filled steel cage in a contracted state until the guide module is pulled out from the top of the inner cavity of the core-filled steel cage; S8. Concrete is poured into the inner cavity of the precast pipe pile; S9. The concrete is hardened and cured.

[0016] In summary, the present invention has at least one of the following advantages: (1) The guide module (when expanding) is used to radially limit the support base, so that the support base and the precast pipe pile form an annular gap, thereby avoiding the problem of contact and friction between the edge of the support base and the inner wall of the precast pipe pile. This avoids the problems of wear on the inner wall of the precast pipe pile, jamming at the bottom of the filling steel cage due to bending deformation, and the support base being tilted and unable to be locked.

[0017] (2) When the guide module moves upward, the top of the flip plate is pulled out from the receiving gap and converges inward, so that the top of the guide module shrinks into a conical structure, thereby reducing the probability that the flip plate is inserted into the first gap of the filling hoop during the upward process, that is, reducing the probability that the guide module and the filling steel cage will get stuck, and improving the reliability and convenience of the operation.

[0018] (3) The presence of the first sleeve creates a accommodating gap to provide space for the swing of the flipped upright plate, thus avoiding the problem that the spirally arranged core stirrups would block the flipped upright plate and cause it to be unable to swing.

[0019] (4) While the support base is connected to the bottom plate, the support base is separated from the guide module (which has the technical advantages of simplifying operation and improving efficiency). The guide module can be removed from the cavity of the precast pipe pile by lifting (without being poured into the bottom of the precast pipe pile with concrete). On the one hand, the guide module can be reused to reduce material loss; on the other hand, the problem of the guide module reducing the bearing capacity of the bottom of the prestressed pipe pile as an impurity is avoided, thus improving the construction quality.

[0020] (5) The retraction of the guide module is achieved by lifting the main sling, that is, the retraction and lifting of the guide module are carried out simultaneously, which reduces the operation steps and improves the construction efficiency.

[0021] (6) The stud moves from between the first and second screw holes to between the second and third screw holes by rotation, thus simultaneously separating the support base from the guide module and connecting the support base to the bottom plate. This reduces the number of transmission structures and improves the reliability and operating efficiency of the invention. The stud is driven by the first motor, which further improves the degree of automation.

[0022] (7) During construction, particles that inevitably fall will slide down along the upper convex strip (with an inverted V-shaped top surface) and accumulate in the V-groove under their own weight. Therefore, the particles will not hinder the tight interlocking between the upper and lower convex strips.

[0023] (8) The top surface of the upper convex strip is inverted V-shaped, so it is difficult for particles to accumulate at the top of the upper convex strip; and the top opening of the third screw hole b is set at the top of the upper convex strip, so the number of particles falling into the third screw hole b can be reduced, thereby reducing the problem of the stud and the third screw hole b being stuck by particles.

[0024] (9) A plastic film is provided on the top surface of the upper protrusion to seal the top opening of the third screw hole, which can completely prevent the problem of particles falling into the third screw hole and ensure that the stud can be smoothly screwed into the third screw hole. The bottom end of the stud is provided with a piercing tip to pierce the plastic film located above the third screw hole.

[0025] (10) If the maximum outer diameter of the upper extension cavity is greater than the maximum outer diameter of the third screw hole, the stud and the side wall of the upper extension cavity can accommodate the downward-turned lower bend. Since the stud and the side wall of the upper extension cavity do not engage, the lower bend will not be driven downward when the stud rotates, thus avoiding the problem of the lower bend entering the third screw hole, and thus avoiding the problem of the lower bend getting stuck between the third screw hole and the stud.

[0026] (11) The present invention uses a pressure relief valve to maintain pressure, eliminating the need to insert the external liquid pump into the cavity of the precast pipe pile along with the guide module, thus providing greater construction convenience (on the one hand, the external liquid pump is large in size and difficult to insert into the cavity of the precast pipe pile; on the other hand, the external liquid pump is heavy, and if it is inserted into the cavity of the precast pipe pile along with the guide module, it will be more difficult to lift it upwards; thirdly, there is no space in the guide module to accommodate the external liquid pump, so if the external liquid pump slides between the flip plate and the bottom surface of the first base cavity, it will cause the flip plate to get stuck and unable to retract). Attached Figure Description

[0027] The present application will be further explained below with reference to the accompanying drawings: Figure 1 This is a front view of the overall structure of the present invention. Figure 2 A schematic diagram of the connection structure of the core-filling steel cage, the first sleeve, and the support base; Figure 3 A forward view diagram of the expanded state of the guide module; Figure 4 A top view diagram showing the location and structure to accommodate the gap; Figure 5 A front view diagram showing the positions of the first telescopic rod and the first motor; Figure 6 This is a front view of the first telescopic rod structure in an elevation section. Figure 7 A front view of the vertical section showing the stud positioned between the first and second screw holes. Figure 8 A front view of the vertical section showing the stud positioned between the second and third screw holes. Figure 9 This is a schematic diagram of the cross-sectional structure of the first output shaft, sleeve, and stud. Figure 10 Front view schematic diagram of the main sling, distribution plate, and distribution sling connection structure; Figure 11 A front view diagram of the guide module in its retracted state; Figure 12 This is a top-view diagram showing the position of the upper convex strip and the structure. Figure 13 This is a schematic diagram showing the position of the lower convex strip and the structure from an oblique upward view. Figure 14 A cross-sectional view showing the location and structure of the plastic film; Figure 15 This is a schematic diagram of the vertical section of the lower extension groove location and structure.

[0028] Explanation of reference numerals in the attached figures: In the picture, 1. Precast pipe pile; 11. First reinforcing cage; 12. Concrete layer; 13. Tension ring; 131. Receiving groove; 132. Guide slope; 2. Filler core steel cage; 21. Filler core main reinforcement; 22. Filler core stirrups; 220. First gap; 3. First sleeve; 30. Accommodation gap; 4. Support base; 40. Annular gap; 41. Second screw hole; 41a. Second screw hole a; 41b. Second screw hole b; 5. Guide module; 51. First base; 511. Upper protrusion; 512. First screw hole; 5110. Annular receiving groove; 52. Flip-up upright plate; 521. Strip plate; 522. Arc plate; 523. First cross brace shaft; 5231. Limiting ring; 53. Roller; 54. First telescopic rod; 541. Cylinder; 542. Telescopic shaft; 543. Piston; 544. Pressure-holding fluid; 545. Pressure relief valve; 546. Check valve; 55. First motor; 551. First output shaft; 552. Sleeve; 56. Stud; 561. Piercing tip; 6. Bottom plate; 61. Third screw hole; 61a. Third screw hole a; 61b. Third screw hole b; 62. Upper protrusion; 621. Plastic film; 6211. Lower bend; 622. Upper extension cavity; 623. Lower extension groove; 7. Pile tip; 8. Main sling; 81. Distribution plate; 82. Distribution sling. Detailed Implementation

[0029] Based on the above-described structural features of this application, the implementation methods of this application will be further described as follows: Reference Figures 1-2 This embodiment provides a prestressed pipe pile, including a precast pipe pile 1, a core-filled steel cage 2, a first sleeve 3, a support base 4, and a guide module 5; the bottom end of the core-filled steel cage 2 is fixedly installed at the outer edge of the top surface of the support base 4 through the first sleeve 3 (for example, through anchoring connection).

[0030] The first steel cage 11 includes main bars and stirrups. The main bars are arranged in a circular array, and the stirrups are spirally wrapped around the outer periphery of the main bars. The main bars and stirrups are welded and fixed at the intersection to form a cage structure.

[0031] Reference Figures 1-2The precast pipe pile 1 includes a first reinforcing cage 11, a concrete layer 12 covering the surface of the first reinforcing cage 11, and two tension rings. The top and bottom ends of the main reinforcing bars of the first reinforcing cage 11 are respectively connected to the two tension rings (for example, the tension rings are provided with tensioning grooves, and the ends of the main reinforcing bars are formed into convex structures by cold forging or hot forging, and the convex structures are locked in the tensioning grooves). The concrete layer 12 has a cylindrical structure, and the two tension rings are fixedly connected to the top and bottom sides of the concrete layer 12 respectively. During prefabrication, the first reinforcing cage 11 and the tension rings are installed in the prefabrication mold, and then the two tension rings are tensioned. Then, concrete is poured into the mold and the prefabrication mold is rotated. Under the action of centrifugal force, the concrete flows to the inner side wall of the prefabrication mold and hardens to form a cylindrical precast pipe pile 1.

[0032] Reference Figure 2 The core-filled steel cage 2 includes core-filled main bars 21 and core-filled stirrups 22. The core-filled main bars 21 are provided in a circular array. The core-filled stirrups 22 are spirally wrapped around the core-filled main bars 21. The core-filled main bars 21 and core-filled stirrups 22 are welded and fixed at the intersection to form a cage structure.

[0033] Reference Figures 1-2 The supporting base 4 is a cylindrical structure with an open top and a closed bottom; the first base 51 is a cylindrical structure with an open top and a closed bottom. Several first sleeves 3 are arranged in a circumferential array along the outer edge of the top surface of the supporting base 4; the bottom end of the first sleeve 3 is fixedly connected to the top surface of the supporting base 4 (e.g., by bolts or by welding); the bottom end of the core filling main reinforcement 21 is anchored and inserted into the first sleeve 3.

[0034] Reference Figure 11 The guide module 5 can retract to reduce the probability of jamming with the core-filling steel cage 2 (i.e., the first gap 220 of the core-filling stirrups 22) when the guide module 5 moves upward. (Refer to...) Figure 1 , Figure 3 and Figure 10 The guide module 5 can expand to radially limit the support base 4, so that the support base 4 and the precast pipe pile 1 form an annular gap 40, thereby avoiding the problem of contact and friction between the edge of the support base 4 and the inner wall of the precast pipe pile 1.

[0035] Reference Figure 4 A receiving gap 30 for accommodating the flip-up upright plate 52 is provided between adjacent first sleeves 3. The receiving gap 30 is arranged radially along the support base 4.

[0036] Reference Figure 3 and Figure 4The guide module 5 includes a first base 51, a tilting upright plate 52, and rollers 53. The first base 51 is detachably installed inside the support base 4. The bottom end of the tilting upright plate 52 is rotatably connected to the first base 51, and the top end is connected to the rollers 53. The tilting upright plate 52 and rollers 53 provide radial support between the precast pipe pile 1 and the support base 4, preventing impact damage and friction damage to the inner wall of the precast pipe pile 1 and the outer edge of the bottom surface of the support base 4. The top end of the tilting upright plate 52 can swing to insert into the receiving gap 30, allowing the rollers 53 to abut against the inner wall of the precast pipe pile 1. Several tilting upright plates 52 (no less than 4) are arranged in a circumferential array (equally spaced and at equal angles) along the inner sidewall of the first base 51, thereby achieving circumferential support for the support base 4 and further avoiding the problem of eccentric loading.

[0037] Reference Figure 3 When the roller 53 is pressed against the inner wall of the precast concrete pile, the roller 53 can roll to reduce friction and improve the smoothness of lowering the core reinforcement cage 2, the first sleeve 3, the support base 4 and the guide module 5.

[0038] Reference Figure 4 and Figure 5 The bottom end of the flip-up upright plate 52 is rotatably connected to the first base 51 via the first cross brace shaft 523; the first cross brace shaft 523 is inserted into the horizontal insertion hole at the bottom end of the flip-up upright plate 52; a limiting ring 5231 is fixedly sleeved on the surface of the first cross brace shaft 523 (for example, by bolt fixing); a limiting ring 5231 is installed on both sides of each flip-up upright plate 52, so that two adjacent limiting rings 5231 can clamp and limit the flip-up upright plate 52 from both sides, preventing the flip-up upright plate 52 from unnecessary sliding along the axial direction of the first cross brace shaft 523, thereby improving the operational stability of the present invention.

[0039] Reference Figure 4 Multiple first cross bracing shafts 523 are arranged in a regular polygonal shape along the radial direction of the first base 51. The flip-up upright plate 52 is perpendicular to the top surface of the first base 51.

[0040] Reference Figure 4 Both ends of the first cross brace shaft 523 are fixedly connected to the inner sidewall of the first base 51 (e.g., by bolts).

[0041] Reference Figure 5 The flip-up upright plate 52 includes a strip plate 521 and an arc plate 522. The ends of the strip plate 521 and the arc plate 522 are fixedly connected in an L-shape (e.g., by an integral fixed connection). The end of the arc plate 522 away from the strip plate 521 is inserted into the first cross brace shaft 523. A roller 53 is installed on the end of the strip plate 521 away from the arc plate 522.

[0042] Reference Figure 5 and Figure 6 The first base 51 has a first telescopic rod 54 in its inner cavity; the flipping upright plate 52 is L-shaped, and the top end of the first telescopic rod 54 is rotatably connected to the bending position of the flipping upright plate 52 (i.e., the middle position of the outer edge of the arc-shaped plate 52 near the axis of the first base 51), and the other end is rotatably connected to the bottom surface of the inner cavity of the first base 51; the first telescopic rod 54 includes a cylinder 541, a telescopic shaft 542 inserted into the cylinder 541, and a piston 543 fixedly installed at the end of the telescopic shaft 542; the cylinder 541, the telescopic shaft 542, and the piston 543 are coaxially arranged; the cylinder 541 has a cylindrical inner cavity, and the piston 543 is cylindrical with its outer side wall sealed against the inner cavity side wall of the cylinder 541; the piston 543 can slide along the length direction of the cylinder 541. The cylinder body 541 has a pressure-holding fluid 544 inside (all pressure-holding fluids 544 are located on the side of the piston 543 away from the telescopic shaft 542). The pressure-holding fluid 544 is used to limit the piston 543 to the top of the cylinder body 541, thereby locking the expansion state of the guide module 5. The cylinder body 541 has a pressure relief valve 545 on its side wall. When the pressure relief valve 545 is in passage, the pressure-holding fluid 544 can flow out from the cylinder body 541 to release the locking of the guide module 5. The pressure relief valve 545 is a solenoid valve.

[0043] Reference Figure 1 , Figure 7 and Figure 8 The first base 51 has a vertically positioned first screw hole 512 in its base plate, and the supporting base 4 has a second screw hole 41 adapted to the first screw hole 512 in its base plate; the second screw hole 41 is vertically positioned; the bottom surface of the precast pipe pile 1 has a bottom end plate 6, and the top surface of the bottom end plate 6 has a third screw hole 61 adapted to the second screw hole 41; the third screw hole 61 is vertically positioned; the internal threads of the first screw hole 512, the second screw hole 41, and the third screw hole 61 are mutually adapted; a stud 56 is threadedly connected to the second screw hole 41; the outer side plate of the stud 56 It has an upper threaded part and a lower threaded part located below the upper threaded part; the upper threaded part and the lower threaded part are adapted to each other; the stud 56 can rotate until the upper threaded part, which was originally inserted into the first screw hole 512, is screwed out of the first screw hole 512 (during the process, the upper threaded part is disengaged from the first screw hole 512), and the lower threaded part, which was originally inserted into the second screw hole 41, is screwed out of the second screw hole 41 and screwed into the third screw hole 61 (during the process, the lower threaded part is engaged with the third screw hole 61), so that the support base 4 is disengaged from the first base 51 and connected to the lower end plate.

[0044] Reference Figure 7 and Figure 8 When the bottom surface of the support base 4 is pressed against the top surface of the bottom plate 6, the first screw hole 512, the second screw hole 41 and the third screw hole 61 are matched, aligned and connected.

[0045] Reference Figure 1 , Figure 7 and Figure 8 An inner receiving groove 131 is provided on the tensioning ring located at the bottom end of the first reinforcing cage 11, allowing the support base 4 to be inserted into the receiving groove 131 when it descends. A guide ramp 132 is provided in the upper middle part of the side wall of the receiving groove 131 to guide the support base 4. When the support base 4 descends, its outer edge first impacts the guide ramp 132, then continues to slide down and inserts into the bottom of the receiving groove 131, allowing the second screw hole 41 and the third screw hole 61 to be aligned.

[0046] Reference Figure 1 , Figure 7 and Figure 8 The first base 51 has a first screw hole 512 at the center of its bottom surface; the support base 4 has a second screw hole 41 at the center of its center; and the bottom plate 6 has a third screw hole 61 at the center of its center. Therefore, regardless of whether the support base 4 and the guide module 5 rotate (with the axis of the precast pipe pile 1 as the center), it can at least ensure that the first screw hole 512, the second screw hole 41 and the third screw hole 61 at the center are aligned.

[0047] Reference Figure 5 , Figure 7 and Figure 9 The bottom surface of the inner cavity of the first base 51 is provided with an upper protrusion 511 for supporting the first motor 55; the first motor 55 is upright, and the housing of the first motor 55 is fixedly installed on the top surface of the upper protrusion 511 by bolts. The top of the upper protrusion 511 is provided with a first through hole that is coaxially arranged and connected with the first screw hole 512. The first output shaft 551 of the first motor 55 is inserted into the first through hole and can rotate. The first output shaft 551 of the first motor 55 is fixedly inserted into the inner cavity of the sleeve 552 (e.g., by bolts); the stud 56 has a first blind hole, the sleeve 552 is inserted into the first blind hole and can slide relative to it along the axial direction of the first blind hole; the cross-section of the first blind hole is hexagonal (i.e., the sleeve 552 is a straight hexagonal prism structure), the outer surface of the sleeve 552 is in contact with and slidably connected to the inner wall of the first blind hole; the first output shaft 551 transmits torque to the stud 56 through the sleeve 552, thereby driving the sleeve 552 and the stud 56 to rotate; when the stud 56 rotates in the second screw hole 41, the sleeve 552 moves relative to it along the axial direction of the first blind hole (since the sleeve 552 is fixed to the first output shaft 551, the actual height of the sleeve 552 should remain unchanged and the height of the stud 56 should decrease).

[0048] Reference Figure 5 and Figure 7The upper protrusion 511 has an annular receiving groove 5110 on its outer periphery for accommodating pressure-holding fluid 544. The annular receiving groove 5110 is located at the bottom of the inner cavity of the first base 51. The pressure-holding fluid 544 discharged via the first telescopic rod 54 is stored in the annular receiving groove 5110. After the guide module 5 is removed from the inner cavity of the precast pipe pile 1, the annular fluid is prevented from remaining in the inner cavity of the precast pipe pile 1 and contaminating and / or diluting the concrete poured later, thereby improving the construction quality. The top end of the first screw hole 512 is inserted into the middle of the upper protrusion 511, and the top end of the first through hole is located at the center of the top surface of the upper protrusion 511. Therefore, the pressure-holding fluid 544 accumulated in the lower part of the annular receiving groove 5110 cannot flow out of the annular receiving groove 5110 through the first screw hole 512 (i.e., it is prevented from flowing into the inner cavity of the precast pipe pile 1).

[0049] Reference Figure 7 and Figure 8 When the bottom end of the stud 56 engages with the third screw hole 61, the guide module 5 can move upward (for example, under the lifting of the main sling 8) until the sleeve 552 is pulled out from the first blind hole, so as to realize the separation of the guide module 5 and the stud 56.

[0050] Reference Figure 1 and Figure 10 The system also includes a main sling 8 for suspending the guide module 5. The bottom end of the main sling 8 is connected to a distribution sling 82 via a distribution plate 81. The bottom end of the distribution sling 82 is connected to the end of the tilting plate 52 near the roller 53. When the tilting plate 52 is lifted by the distribution sling 82, the guide module 5 retracts and moves upward along the inner cavity of the filler steel cage 2. The top end of the main sling 8 is connected to an electric winch installed at the top opening of the precast pipe pile 1. The electric winch is mounted above the top opening of the precast pipe pile 1 via a bracket. The electric winch can raise and lower the main sling 8, thereby driving the guide module 5 to rise and fall. The bottom end of the main sling 8 is fixedly connected to the middle of the distribution plate 81 (e.g., anchored connection). The top end of the distribution sling 82 is fixedly connected to the distribution plate 81 (e.g., anchored connection), and the bottom end is fixedly connected to the top end of the strip plate 521 (e.g., anchored connection). Multiple distribution slings 82 are provided, each corresponding to a tilting plate 52. The distribution slings 82 and their corresponding tilting plates 52 are connected. Multiple distribution slings 82 are arranged in a circular array (equally spaced and at equal angles) along the distribution disc 81.

[0051] Reference Figure 11When the main sling 8 (and the distribution sling 82) lifts the guide module 5 upward, it can drive the top of the guide module 5 to retract. Under the action of the guide module 5's own weight, the top of the flipping plate 52 converges inward from the receiving gap 30, causing the top of the guide module 5 to retract into a conical structure, thereby reducing the probability that the guide module 5 will be stuck by the core-filling stirrup 22 (the first gap 220) when it rises (the core-filling stirrup 22 is spiral and has the first gap 220; if the flipping plate 52 is outwardly flared, the roller 53 and the strip plate 521 can easily be inserted into the first gap 220, causing the guide module 5 to be unable to continue rising).

[0052] Reference Figure 1 The bottom plate 6 has a pile tip 7 installed on its bottom surface, such as a cross-shaped or conical pile tip 7 structure (e.g., fixed by welding).

[0053] Reference Figure 1 , Figure 12 and Figure 13 The lower surface of the support base 4 is provided with a lower protrusion (e.g., fixed by an integral connection or by bolts), and the upper surface of the bottom plate 6 is provided with an upper protrusion 62 (e.g., fixed by an integral connection or by bolts). The upper protrusion 62 is located at the bottom of the receiving groove 131. Several lower protrusions are provided and arranged in a circumferential array (with the axis of the support base 4 as the center) at equal intervals and angles. Several upper protrusions 62 are provided and arranged in a circumferential array (with the axis of the support base 4 as the center) at equal intervals and angles. The upper protrusions 62 and lower protrusions can be staggered and inserted to align the second screw hole 41 and the third screw hole 61.

[0054] The cross-section of the lower convex strip is an inverted isosceles triangle, and the cross-section of the upper convex strip 62 is an upright isosceles triangle, thereby achieving a fitting and insertion connection, so that the support base 4 (centered on the axis of the precast pipe pile 1) rotates until the second screw hole 41 and the corresponding third screw hole 61 are fitted and aligned (i.e., coaxially set).

[0055] Reference Figure 12 and Figure 13There are seven second screw holes 41, including one second screw hole a41a and six second screw holes b41b. The second screw hole a41a is located on the axis of the support base 4, and the second screw holes b41b are hexagonal in shape and are arranged on the outer periphery of the second screw hole a41a. There are seven third screw holes 61, including one third screw hole a61a and six third screw holes b61b. The third screw hole a61a is located on the axis of the bottom plate 6, and the third screw holes b61b are hexagonal in shape and are arranged on the outer periphery of the third screw hole a61a. The second screw holes b41b and the third screw holes b61b are one-to-one and are connected by studs 56. During the process of pressing the support base 4 onto the bottom plate 6, the lower protrusion presses onto the upper protrusion 62 and slides against each other until the lower protrusion and the lower protrusion engage with each other, and the second screw hole a41a and the third screw hole a61a are aligned with each other (i.e., coaxially set), and the second screw hole b41b and the corresponding third screw hole b61b are aligned (i.e., coaxially set), which is used to realize the connection of multiple studs 56 between the support base plate and the bottom plate 6.

[0056] Reference Figure 12 , Figure 13 and Figure 14 There are six lower protrusions, and the bottom opening of the second screw hole b41b is located in the groove between adjacent lower protrusions. There are six upper protrusions 62, and a third screw hole b61b corresponds to each upper protrusion 62. The top opening of the third screw hole b61b is located at the top of the corresponding upper protrusion 62 to reduce the number of particles falling into the third screw hole b61b. (Refer to...) Figure 15 A V-shaped groove is provided between adjacent upper protrusions 62, and a lower extension groove 623 is provided at the bottom end of the V-shaped groove, which is connected to the V-shaped groove. During construction, dust, gravel, and other particles will inevitably fall into the inner cavity of the precast pipe pile 1 and accumulate on the top surface of the bottom plate 6. Under their own weight, the particles will slide down along the upper protrusions 62 (which have an inverted V-shaped top surface) and accumulate in the V-shaped groove. Therefore, the particles will not hinder the (tight) engagement between the upper and lower protrusions 62. Similarly, particles will not accumulate at the top of the upper protrusions 62, and it is difficult for particles to accumulate at the top opening of the third screw hole b61b. Therefore, the amount of particles falling into the third screw hole b61b can be reduced, thereby avoiding the problem of the stud 56 being jammed by particles between it and the third screw hole b61b.

[0057] Reference Figure 14 The top surface of the upper protrusion 62 is provided with a plastic film 621 (for example, by adhesive fixation, and no plastic film 621 is provided above the V-groove). The plastic film 621 can block the top opening of the third screw hole 61 (including the third screw hole a61a and the third screw hole b61b) to prevent particles from falling into the third screw hole 61, so as to avoid the problem of the third screw hole 61 and the stud 56 being jammed by particles.

[0058] Reference Figure 14 The bottom end of the stud 56 is provided with a (reverse conical) piercing tip 561; when the bottom end of the stud 56 is screwed into the third screw hole 61, the piercing tip 561 can pierce the plastic film 621.

[0059] Reference Figure 14 When the plastic film 621 is punctured, a downward bend 6211 is formed. Under the friction of the stud 56, the downward bend 6211 is prone to getting stuck between the stud 56 and the third screw hole, causing the stud 56 to jam. To avoid this problem, the upper protrusion 62 is provided with an upper extension cavity 622. The upper extension cavity 622 is located at the top of the third screw hole 61 and communicates with the third screw hole 61. The maximum outer diameter of the upper extension cavity 622 is greater than the maximum outer diameter of the third screw hole 61. Therefore, the downward bend 6211 can be accommodated between the stud 56 and the side wall of the upper extension cavity 622. Since the stud 56 and the side wall of the upper extension cavity 622 fail to engage, a downward driving force cannot be applied to the downward bend 6211, thus avoiding the problem of the downward bend 6211 entering the third screw hole 61, and thus avoiding the problem of the downward bend 6211 getting stuck between the third screw hole 61 and the stud 56.

[0060] The top opening of the upper cavity 622 is located at the top of the upper protrusion 62.

[0061] The third screw hole 61 is a blind hole, that is, the bottom end is sealed, which is used to prevent soil from entering and blocking the third screw hole 61 during the pile driving process.

[0062] A construction method for prestressed concrete pipe piles, comprising the following steps: S1. Lay out the lines on the ground of the construction site, and then carry out drilling operations (e.g., using a drilling rig).

[0063] S2. Insert the precast pipe pile 1 into the hole (e.g., using a pile driver).

[0064] S3. Lay a plastic film 621 on the upper surface of the upper protrusion 62, spray a lubricant (such as lubricating oil) on the lower surface of the lower protrusion 42, then connect the support base 4 to the guide module 5, and then connect the support base 4 to the core filling steel cage 2 through the first sleeve 3.

[0065] S4. Inject pressure-holding fluid 544 into the first telescopic rod 54 (combined with...) Figure 6 A one-way valve is installed on the side wall of the cylinder 541, allowing the user to inject pressure-holding fluid 544 into the inner cavity of the cylinder 541 through the one-way valve 546, causing the tilting plate 52 to rotate and insert into the receiving gap 30; then the pressure relief valve 545 is closed.

[0066] S5. Insert the core-filling steel cage 2, the first sleeve 3, the support base 4 and the guide module 5 into the inner cavity of the precast pipe pile 1; until the support base 4 is pressed onto the bottom plate 6, and the second screw hole 41 is adapted to align with the third screw hole 61.

[0067] S6, the stud 56 rotates until the support base 4 is disengaged from the guide module 5 and the support base 4 is connected to the bottom plate 6.

[0068] S7. Open the pressure relief valve 545 (i.e., release the lock of the guide module 5), and at the same time, the main hoisting cable 8 lifts the guide module 5 upward, so that the guide module 5 is in a contracted state (during the process, the first telescopic rod 54 is compressed and shortened, and the pressure-holding fluid 544 flowing out through the first telescopic rod 54 accumulates in the annular receiving groove 5110) and moves upward along the inner cavity of the core-filling steel cage 2 until the guide module 5 is pulled out from the top of the inner cavity of the core-filling steel cage 2 (the annular receiving groove 5110 moves out of the inner cavity of the core-filling steel cage 2 along with the first base 51, so it will not remain in the precast pipe pile 1, thus avoiding the problem of the concrete concentration decreasing when concrete is poured into the inner cavity of the precast pipe pile 1 later).

[0069] S8. Tension the top of the main reinforcing bar 21 of the filling core steel bar upward (for example, by using a hydraulic jack and anchor plate) so that the main reinforcing bar 21 is in a tensioned state; then pour concrete into the cavity of the precast pipe pile 1.

[0070] S9. Harden and cure the concrete, then release the tension at the top of the main reinforcing bar 21 (e.g., remove the hydraulic jack) to obtain the prestressed pipe pile finished product.

[0071] The pressure-holding fluid 544 is water, which is difficult to compress and can be used to maintain pressure on the first telescopic rod 54; it also has the advantage of low cost. The plastic film 621 is made of materials such as polyethylene, polyvinyl chloride, polystyrene, polyester film, polypropylene, and nylon.

[0072] An ultrasonic sensor or camera is installed inside the first base 51 to monitor the depth position of the guide module 5 in real time and provide feedback to the user.

[0073] The invention also includes an electrical cabinet, which is fixedly installed on the ground by bolts; the first motor 55, ultrasonic sensor, camera, solenoid valve, and electric winch are respectively connected to the electrical cabinet by wires and signal lines; the wires and signal lines are spirally wound on the outer surface of the main sling 8; the electrical cabinet is connected to the external power supply and external controller (such as a computer or PLC programmable logic controller) by wires and signal lines, and the external controller controls the start and stop of the first motor 55, ultrasonic sensor, camera, solenoid valve, and electric winch in the invention through the electrical cabinet.

[0074] The first motor 55 is a controllable motor (such as a servo motor or a stepper motor). The controllable motor is controlled by an external controller that inputs electrical signals to it, which can control the motor's speed, number of revolutions per rotation, rotation angle per rotation, and start / stop timing.

[0075] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0076] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0077] In conclusion, for those skilled in the art, any changes, modifications, substitutions, or variations made to this invention based on the guidance of this invention, without departing from the principles and spirit of this invention, still fall within the protection scope of this invention.

Claims

1. A prestressed pipe pile, characterized in that: It includes a precast pipe pile (1), a core-filled steel cage (2), a first sleeve (3), a support base (4), and a guide module (5); the bottom end of the core-filled steel cage (2) is fixedly installed on the outer edge of the top surface of the support base (4) through the first sleeve (3); a receiving gap (30) is provided between adjacent first sleeves (3). The guide module (5) is capable of contraction and expansion; The guide module (5) includes a first base (51), a flip plate (52), and a roller (53); the first base (51) is detachably installed in the inner cavity of the supporting base (4), the bottom end of the flip plate (52) is rotatably connected to the first base (51), and the top end is connected to the roller (53); the top end of the flip plate (52) can swing to insert into the receiving gap (30), so that the roller (53) can abut against the inner wall of the precast pipe pile (1).

2. The prestressed pipe pile according to claim 1, characterized in that: The first base (51) has a first telescopic rod (54) in its inner cavity; the flip-up plate (52) is L-shaped, and the top end of the first telescopic rod (54) is rotatably connected to the bending position of the flip-up plate (52), and the other end is rotatably connected to the bottom surface of the inner cavity of the first base (51); The first telescopic rod (54) includes a cylinder (541), a telescopic shaft (542) inserted into the cylinder (541), and a piston (543) fixedly disposed at the end of the telescopic shaft (542); the inner cavity of the cylinder (541) is provided with a pressure-holding fluid (544), which is used to limit the piston (543) to the top of the inner cavity of the cylinder (541) to lock the expansion state of the guide module (5); The cylinder (541) is provided with a pressure relief valve (545) on its side wall. When the pressure relief valve (545) forms a passage, the pressure-holding fluid (544) can flow out from the inner cavity of the cylinder (541) to release the locking of the guide module (5).

3. The prestressed pipe pile according to claim 2, characterized in that: The first base (51) has a first screw hole (512) in its base plate, and the supporting base (4) has a second screw hole (41) in its base plate that is adapted to the first screw hole (512). The precast pipe pile (1) has a bottom end plate (6) on its bottom surface, and the bottom end plate (6) has a third screw hole (61) adapted to the second screw hole (41) on its top surface. A stud (56) is threadedly connected to the second screw hole (41); the outer side plate of the stud (56) is provided with an upper threaded part and a lower threaded part located below the upper threaded part; the stud (56) can rotate until the upper threaded part disengages from the first screw hole (512) and the lower threaded part engages with the third screw hole (61), so that the support base (4) disengages from the first base (51) and connects to the lower end plate.

4. The prestressed pipe pile according to claim 3, characterized in that: The bottom surface of the inner cavity of the first base (51) is provided with an upper protrusion (511) for supporting the first motor (55); the outer periphery of the upper protrusion (511) is provided with an annular receiving groove (5110) for accommodating the pressure-holding fluid (544).

5. The prestressed pipe pile according to claim 4, characterized in that: The first output shaft (551) of the first motor (55) is fixedly inserted into the inner cavity of the sleeve (552); the stud (56) is provided with a first blind hole, and the sleeve (552) is inserted into the first blind hole; the first blind hole has a hexagonal cross-section, and the outer surface of the sleeve (552) is attached to and slidably connected to the inner wall of the first blind hole; the first output shaft (551) transmits torque to the stud (56) through the sleeve (552); when the stud (56) rotates in the second screw hole (41), the sleeve (552) moves relative to the first blind hole along the axial direction.

6. The prestressed pipe pile according to claim 5, characterized in that: When the bottom end of the stud (56) engages with the third screw hole (61), the guide module (5) can move upward until the sleeve (552) is pulled out from the first blind hole.

7. The prestressed pipe pile according to claim 6, characterized in that: It also includes a main sling (8) for suspending the guide module (5), the bottom end of the main sling (8) being connected to the distribution sling (82) via a distribution plate (81), and the bottom end of the distribution sling (82) being connected to the end of the flip-up plate (52) near the roller (53); When the flip-up upright plate (52) is lifted by the distribution sling (82), the guide module (5) retracts and moves upward along the inner cavity of the core-filling steel cage (2).

8. The prestressed pipe pile according to claim 7, characterized in that: The supporting base (4) has a cylindrical structure with an open top and a closed bottom; the first base (51) has a cylindrical structure with an open top and a closed bottom.

9. The prestressed pipe pile according to claim 8, characterized in that: The bottom end plate (6) is equipped with a pile tip (7).

10. A construction method for prestressed concrete pipe piles, characterized in that, The steps for constructing the prestressed pipe pile according to claim 9 include: S1, Drilling; S2. Insert the precast pipe pile (1) into the hole; S3. Connect the support base (4) to the guide module (5), and then connect the support base (4) to the core filling steel cage (2) through the first sleeve (3); S4. Inject the pressure-holding fluid (544) into the first telescopic rod (54) to rotate the flip-up plate (52) into the receiving gap (30); then close the pressure relief valve (545). S5. Insert the core-filling steel cage (2), the first sleeve (3), the support base (4) and the guide module (5) into the inner cavity of the precast pipe pile (1); until the support base (4) is pressed onto the bottom plate (6) and the second screw hole (41) is adapted to align with the third screw hole (61). S6. The stud (56) rotates until the support base (4) is disengaged from the guide module (5) and the support base (4) is connected to the bottom plate (6); S7. Open the pressure relief valve (545), and at the same time, the main hoisting cable (8) lifts the guide module (5) upward, so that the guide module (5) moves upward along the inner cavity of the core-filling steel cage (2) in a contracted state until the guide module (5) is pulled out from the top of the inner cavity of the core-filling steel cage (2); S8. Pour concrete into the cavity of the precast pipe pile (1); S9. Harden and cure the concrete.

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